Vertical Vibration Concrete Pipe Machine

2017-08-22 08:30:13 admin 10

Concrete pipe making machine

Concrete pipe making machine having a combined vibrating core (37) and counter rotating pac­ kerhead assembly (38) is used with a mold (24) to prepack and vibrate concrete within the mold (24) to produceconcrete pipe (100). A controller (179) is programed in response to packing force of the pac­
kerhead assembly (38) to control the discharge of concrete into the mold (24) and the lift speed of the core and packerhead assembly (38) to produce con­ crete pipe (100) having uniform density through out the length of the pipe (100).

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TECHNICAL FIELD

 


The invention is in the field of concrete product making machines and controls for operating the machines. The particular concrete product making machines use combined packerhead and vibration processes to make concrete pipe. These machines have packerheads to prepack concrete in  molds and corss that are vibrated as they move up into molds to form and densify the prepacked concrete into concrete pipes.


BACKGROUND OF INVENTION

There are two general  types of concrete pipe making machines known as packerhead and vibrat­ ing core machines. Packerhead concrete pipe mak­ ing machines have rotating packerheads that are moved up into molds to form concrete pipes. An example of a packerhead concrete pipe making machine having a counter rotating packerhead is shown in U.S. Patent 4,407,648, which issued to N.
T. Fosse on October 4, 1983. The vibrating core concrete pipe making machines have generally cy­ lindrical cores accommodating vibrators. The cores are moved up into molds to form concrete  pipes. The vibrators operate to  consolidate  and  densify the concrete in the molds during the forming of the pipes. The vibrating core concrete pipe making machine is generally slower in operation than a packerhead concrete pipe making machine. An ex­ ample of a vibrating core concrete pipe making machine is shown in U.S. Patent 3,948,354, which issued to N. T. Fosse and W. M. Montgomery on April 6, 1976.
The vibration process is a relatively slow meth­ od of making concrete pipe. However, the vibration process produces denser pipes and does not twist the cages. The packerhead process is fast in op­ eration and can result in reinforcing cage twist. The packerhead process produces concrete pipes hav­ ing smooth outside and inside finishes. The outside finish of pipes made by vibrations process is not smooth due to a tendancy of air pockets to collect between  the  outside  walls  of  the  pipes  and  the

PRIOR ART

U.S. Patents 2,926,411 and 3,141,222, which issued to H. Steiro on March 1, 1960 an July 21, 1964 respectively, discloses concrete pipe making machines that have cores located within cylindrical molds. When  the  cores are up in the molds, con­ crete  is  discharged  into  the  annular  spaces  between the cores and molds. A distributor mounted on top of the core is used in U.S. Patent 3,141,222 to move concrete into the mold. The core is recip­ rocated and vibrated to trowel the inner surface of
5 the pipe and se忧le the concrete in the mold. U.S. Patent 3,095,628 which issued to 0. N. Norton and
M. C. Mckinley on July 2, 1963; U.S. Patent 3,655,842 which issued to F. A. Traytiner on April 11, 1972 and U.S. Patent 4,253,814, which issued
10 to A. W. Christian on March 3, 1981 disclose concrete pipe making machines having cores and packerheads that are concurrently used to make concrete pipe. The packerheads are connected to lift  structures  located  above  the  molds  and  are rotated with power units mounted on these  struc­ tures. The cores are moved up into the molds with
separate lift cylinders. U.S. Patent 3,948,354 which issued to M.   . Fosse and W. M. Montgomery on
April  6,  1976  and  U.S.  Patent  4,131,408  which issed to  J.  P. Schulster,  S. N. Halbach,  0. Haar, and T. L. Crawford on December 26, 1978 dis­ closes concrete pipe making machines having vibrating cores that move up into molds to form the pipe  and  densify  the  concrete.  Distributor  arms rotated above the cores move concrete  into  the annular spaces between the cores and mold as the cores are moved up into the molds.


30 SUMMARY OF INVENTION

The machine for making concrete  product, such as a concrete pipe, of the  invention utilizes concurrent packerhead and vibration  processes to
35 form  and densify concrete into pipe. The machine has a generally upright core supporting a vibrator used to vibrate the side wall of the core to subject the concrete in the mold around the core to vibra­ tions which densify the concrete. A counter rotating
40 packerhead  assembly  is  mounted  on  top  of  the core and functions to prepack the concrete into a configuration that generally has a cylindrical interior before it is subjected to vibrations generated by the core. The prepacking of the concrete by the coun-
45 ter  rotating  packerhead  assembly  produces  pipe . having a smooth finish on its outside surface as the concrete  is  forced  against  the  mold wall  to  pre­ elude the entrapment  of  air  pockets  adjacent the mold. The  prepacking of the concrete  before  it is
so subjected to the vibrations of the core reduces the amount of time required to vibrate the concrete to produce a finished concrete pipe. The combination of the packerhead and vibrating processes em­ ployed in the machine for making pipe  produces concrete pipe that has substantially the same den-
 
 
sity as pipes made on vibration machine with the same quality inside and outside surface finish  as concrete pipes made on a conventional packerhead machine.
The preferred embodiment of the machine for making a cylindrical concrete pipe uses an upright mold having a generally  cylindrical mold side wall surrounding  a  mold  chamber.  A  generally  cylin­ drical  reinforcing  wire  cage  is  located  within  the mold chamber adjacent the mold side wall to pro­ vide  reinforcement  for  the finished  concrete  pipe. Concrete pipe can also be made without reinforcing structure, such as a cylindrical wire cage, with the machines  herein described. A turntable  having an opening supports the mold in general vertical align­ ment with  the opening. A  stationary  floor  can be used  to  support  the  mold.  The  concrete  pipe  is formed  with  a vibrating  core and counter  rotating packerhead assembly  having two roller heads that are  initially  positioned  below  the  turntable  in the vertical  alignment  with  the  opening.  The  core  is supported  on  a  lift  or  elevator  that  moves  the packerhead assembly  and core up and down into and  out  of  the  mold  chamber  to  make  concrete pipe. A conveyer located above the mold operates to discharge concrete into the mold chamber above the  counter  rotating  packerhead  assembly  which operates to distribute and prepack the concrete in the mold chamber during its upward movement in the mold chamber before the concrete is subjected to the forming and densification action of the vibrat­ ing core. The core has a cylindrical side wall that supports a vibrator operable to vibrate the side wall and thereby  subject the concrete around the core to  vibrations  as the  core  moves  upwardly  in the mold  chamber.  The  vibrations  enhance  the  den­ sification of the concrete that has been prepacked by the counter rotating packerhead assembly. The counter  rotating packerhead  assembly  located im­ mediately above the core has an upper roller head and a lower  「oller  head. Each roller  head has a plurality  of  circumferentially  arranged  rollers  that are rotatably  mounted for rotation about separate axes  generally  parallel  to  the upright  axis  of  the core. The 「oilers have outer ci「cumferential po「tions that  move  along  a circular  path usually  having  a diameter smaller than the diameter of the core side wall whereby the 「ollers prepack the concrete adja­ cent the mold to a thickness g「eater than thickness of the concrete in the space between the core side wall  and the  mold as the  rollers  move along the circular  path. A first drive located within the core chamber  turns  the  upper  roller  head  in  a  first circumferential  direction about the  upright axis  of the  core. A  second  drive  located  within the  core turns  the  lower  head in a second  circumferential direction opposite the first circumferential direction about the upright axis of the core. The oppositely
turning roller heads produce opposite working or packing forces on the concrete that generally can­ cel each other thereby placing a minimum of tor­ sional or twisting force on the reinforcing cage.
The machine for making concrete pipe has controls for sensing the power used to rotate the packerhead assembly and generating a signal re­ presenting the sense power. The sensed  power can be the  power  used to  rotate  either  the  upper
10 roller  head or  lower rolll?r head or both the upper and lower roller heads. Preferrably, the power used by the first drive to rotate the upper roller head is sensed and used to control the operating speed of the conveyer.  A computer  controller  is programed
1s     to be responsive to the signal to control the speed
of operation of the conveyer thereby  control  the rate at which concrete is discharged by the con­ veyer into the mold chamber above the counter rotating packerhead assembly. When the amount of
20 concrete above the counter rotating packerhead assembly increases, the amount of torque or power required to rotate one or both roller heads in­ creases. The increase in torque is proportional  to the signal supplied to the controller. The controller
25      will then actuate the drive system for the conveyer to slow the speed of operation of the conveyer and thereby reduce the amount of concrete that is discharged into the mold chamber. When  the amount of concrete above the counter rotating pac-
30 kerhead assembly decreases, the  speed of the conveyer increases as the amount of torque or power required to rotate the packerhead assemly decreases. The decrease in the torque to rotate the upper packerhead assembly  is sensed and causes
35 a signal to be sent to the controller at which in turn increases the speed of operation of the conveyer and thereby increasing the amount of concrete that is discharged into the mold. In this  manner.  the level  of  the  concrete  above  the  counter  rotating
40 packerhead assembly is maintained so that the packerhead assembly has a substantually constant prepacking force on the concrete that results in minimum twisting to「ces on the reinforcing  cage and  a continuous  supply  of  concrete  to  the  pac-
45 kerhead assembly.
The core  and counter rotating packerhead as­ sembly mounted thereon are moved up into the mold chamber at a selected speed that is respon­ sive to the signal representing the sense power of
so     the first drive for turning the packerhead assembly.
The sense signal is used to adjust both the operat­ ing speed of the conveyer and the speed of move­ ment of the core and packerhead assembly up into the   mold  to   maintain   a  substaintually   constant
55  packing force on the concrete being prepacked by the packerhead assembly. The power Ii仕 for the core and counter  rotating packerhead assembly utilizes  a hydraulic  cylinder  to  vertically  move the
 
 

The counter rotating upper and lower roller heads 62 and 63 work concrete 98 in the prepack area in opposite directions and minimize twisting forces on cage 35 during the  forming of the con­ crete pipe. Upper roller head 62 has a circular top plate 64 attached to a vertical drive sha仕 67 with a hub 66. A plurality of upwardly directed paddles or fins 68 are mounted on top of plate 64. On rotation of the upper roller assembly 62 fins 68 move the concrete outwardly into the prepacked area 98 around roller head 38. A plurality of cylindrical rollers 69 located below plate 64 are mounted on plate 64. Rollers 69 are circumferentially spaced from each other around plate 64. Upper roller head
62 is shown as having four rollers. Additional  or fewer rollers can be used with upper roller head 62. As shown in Figure 7, a generally upright post or axle 71 extends below plate 64. Post 71 has an upright o仔 center stud 72 that extends through a hole in plate 64. A nut 73 threaded on stud 72 secures post 71 to plate 64. The radial position of roller 69 relative to plate 74 can be adjusted by turning stud 72 as it is offset from the vertical axis of post 71. This adjustment is illustrated by  the arrow in Figure 6. All rollers have similar adjusting structures. Roller 69  has cylindrical  member  such as a metal sleeve 74 that  surrounds post 71. The plurality of bearings 76 and 77 rotatably mount cylindrical member 74 on post 71. A cap 78 in­ serted into the bo忱 m of cylindrical member 74 prevents foreign materials from interferring with the operation of bearings 76 and 77. An elastic sleeve 78, such as a rubber sleeve, is mounted on the cylindrical member 74. A pin 81 holds sleeve 79 in assembled 「elation with member 74. The elastic sleeve 79 does not slide on the concrete and is not easity stopped. Roller 69 will continue to rotate when used with a wide range of concrete mixes. An example of a concrete packing roller having an elastic sleeve is shown in U.S. Patent 4.690.631, which issued to M. L. Haddy on September  1, 1987, incorporated herein by reference. Each roller can have a conventional metal outer sleeve in lieu of elastic sleeve 79. Other hard and wear resistant materials. such as plastic. ceramics  and  the  like, can be used to make the outer sleeve of the roller.
Lower roller head 63 has a circular second plate 82 located below rollers 69. A collar 83 se­ cured to the bottom of plate 82 is keyed to a tubular sleeve or shaft 87 that surrounds the drive shaft 67. Sleeve 87 is rotatably mounted on bear­ ing 88 secured with bolts 89 to the top plate 59 of core 37. A plurality of cylindrical rollers 91 are located  below  plate  82 and are mounted thereon.
 


Rollers 91 are circumferentially spaced  around plate 82. Each of the rollers 91 has a axle or post that is attached with a nut recessed in  plate 82. The rollers 91 each have an outer sleeve of elastic
5 laterial that corresponds to sleeve  79  shown  in Figures 5 and 7. Each roller can have a conven­ tional  metal outer  sleeve  in lieu of  elastic  sleeve
79. Other hard and wear resistant materials, such as  plastic, ceramics  and the  like, can  be used to
10 make the outer sleeve  of  the  roller.  Lower  roller head 63 has four rollers. Additional or fewer rollers can be used with roller assembly 63.  Rollers  69 and 91 rotate about their axes in the directions indicated by the broken line arrows in Figures 4 as
15 roller heads 62 and 63 turn in opposite directions.
Counter rotating packerhead  assembly 38 has a outside circumferential dimension having a diam­ eter that generally  is less then the diameter of the wall  42  of  core  37.  As  shown  in  Figure  4,  the
20 concrete 98 in the annular space in the prepacked area for the concrete has a thickness that is greater than the thickness of the concrete pipe 100  be­ tween wall 42 of core 37 and the inside surface of mold 24.
2s  Counter rotating packerhead assembly 38 is powered with a power transmission indicated gen­ erally at 92 located within core 37 below top plate
59. Power transmission 92 is operated with two hydraulic  motors 93 and 94 to continuously  rotate
30 the upper and lower roller heads 62 and 63  in opposite circumferential directions as indicated by arrows 96 and 97 in Figure 4. Power transmission
92 has a base 99 that carries a housing 101 surrounding  a chamber  102. A  plurality  of  shock
35 absorbing pads  103 mount base  99  and  housing 101 on a plurality of  brackets 104 secured to the inside of wall 42. As shown in Figure 9, bolts 106 secure pads 103 and base 99 to brackets 104.
As shown in Figures 4 and 8. a coupling 17 is
40 connected to power output sleeve 108 of transmis­ sion  92. Shaft 67 is rotatably  mounted on sleeve
108 and a bearing 111 in a cap 109. Bolts 112 secure cap 109 to base 99. Transmission 92 has a first  driven  gear  114 keyed to  a  hub  116 that  is
45  secured to the lower end of sha仕 67 with a key or the like. A drive gear 117 on a shaft 118 has angled teeth that  mesh with  angled teeth of gear
114. A bearing 119 accomodates the upper end of shaft 118 and is mounted on a cover 121 secured
so with bolts 122 to the top of housing 101. A second bearing 123 located on a support 124 accomodates the lower end of shaft 118. The plurality of bolts 126 secure support 124 to base 99. The lower end of  shaft  118 has a pocket  127 that accomodates
ss the  drive shaft  128 of  hydraulic motor 94.  Pocket
127 and drive shaft 128 have cooperating drive structure, such as internal and external splines, to driveably  couple  the  motor  94  to  shaft  118.  A
 
A second driven gear 131 is mounted on out­  tional valve 160 interposed in lines 158 and 159 controls the speed of the operation of hydraulic motor  154 and  thereby  regulate  the  rate  of  dis­
put  sleeve  108 and  secured  thereto  with  a  key,  charge of concrete into the mold chamber. A valve
splines or the like. A bearing 132 separates gear 131 from gear 114. A second bearing 133 rotatably s driver board 180 is wired to the solenoids of valve
160  and  computer  controller  179  whereby •com­
mounts output sleeve 108 on cap 121. A drive gear  mand  signals  from  controller  179  operates  valve
134 on shaft 136 has angled teeth that mesh with  160 to  control  the  speed  of  conveyor  148. Valve
angled teeth on driven gear 131. The upper end of  160 has a movable spool coupled to the solenoids
shaft  136 is  rotatably  mounted  in a  bearing  137 10 and a spool  position sensor  or linear variable  dif­
mounted on cover 131. The lower end of shaft 136 is rotatibly mounted on a bearing 138 carried by a  ferential transducer  165 wired to driver board 180. Transducer  165 sends a feedback  signal to driver
support 139. The plurality of bolts 141 secure sup­ port 139 to base 99. The lower end of shaft 136 has a pocket 143 that accomodates drive shaft 142 

1s board 180 to monitor the position of the spool and reposition the spool to obtain the required flow of hydraulic fluid through the valve whereby  the flow
of hydraulic motor 93. Pocket 143 and drive shaft
142  have  cooperating  drive  structures,  such  as splines, that driveably connect shaft 142 with shaft
136. A plurality of bolts 144 secure hydraulic motor  of  hydraulic  fluid  is  in  accordance  with  the  com­ mand signals from computer controller 179.
Hydraulic motors 93 and 94 are driven by two separate   variable   volume   pumps   162  and   168
93 to support 139. On operation of hydraulic motor 20 shown in Figure 2. Pump  162 is connected to line
94 the drive gear 117 operates to rotate the driven gear 114 in the direction of arrow 146. This rotates upper roller head 38 in the direction of arrow 96 as seen  in Figure 4. The  speed of  operation  of  hy­  163 for delivering hydraulic fluid under pressure to motor 94. Line 164 returns hydraulic fluid from motor 94 to a tank. An electric motor 166 drives pump 162. Motor 166 is coupled to a power trans-
draulic  motor  94  can  be  altered  to  change  the speed of rotation of roller head 62. The hydraulic 2s ducer  167 that senses the electric  power used by motor 166 which is responsive to the load on pump
motor 93 operates to rotate the drive gear 134 to rotate driven gear 131 in the direction of arrow 147. This rotates the lower roller head 63 in the direc­  162. The load on pump 162 is directly proportional to the packing force of top roller head 62. Power transducer  167 provides motor load signals to con-
tion of arrow 97 as shown in Figure 4. The speed 30 trailer  179. Power transducer  167 is a Hall effect
of operation of hydraulic motor 93 can be regulated to change the speed of rotation of the lower roller head 63. Preferably, the speed of rotation of lower  wa忧 transducer which generates an analog motor load output signal voltage varying  between 0 and 10 volts. A representative power transducer is mar­
roller head 63 is a selected and remains substan­ tially constant during the operation of the machine. 
35 keted by Ohio Semitronics, Inc. of Columbus, Ohio. Alternatively,  a power  transducer  can  be used to
Counter rotating packe「head assembly 38 can be powered by a power transmission driven with a  sense  the  electric  power  used  by  motor  172 to provide  signals  to  controller  179 in lieu of  power
single motor or power source. The  transmission can have a reverse gear connected to one of the roller heads so that the single  motor operates to 
40 transducer 167. Further, a second power trans­ ducer operable to sense the electric power used by motor 172 to provide signals to controller  179 can
drive the upper and lower roller heads in opposite  be used with power transducer  167. Controller 179
rotational directions.
Returning to Figure 2. mold 24 is supplied with  uses both signals to control the operation of con­ veyer  148. When  a single  motor is used to drive
concrete  from  a  conveyer  indicated  generally  at  the  packerhead assembly  38, a power transducer
148.  Conveyer  148 is  mounted  on  the  top  end members  19  and  21  of  the  frame  and  has  an 45 will sense the total power used to rotate the pac­ kerhead  assembly  38  and  provide  a  total  power
upwardly open hopper 149 for acco「nodating a supply of concrete 151. An elongated trough hav­ ing a endless belt 152 is located below hopper 149 for  transporting  a  ribbon  156 of  concrete  to  top 


so signal. The total power signal is used by the con­ trailer 179 to control the speed of operation of conveyer 148.
A second variable volume pump  168 1s coup-
table 26 which directs the concrete into the mold chamber.  Belt  152 is trained  about  a drive  pully  led to a line 169 leading to the hydraulic motor 63. A fluid return line 171 coupled motor 93 to a return
153. A hydraulic motor 154 operates to rotate pully 153 and thereby move belt 153 in the direction of the  arrow  155.  Hydraulic  fluid  under  pressure  is 


55 tank. An electric motor 172 drives pump 168. The output flow of hydraulic fluid from pump 168  is regulated to control the speed of motor 93 thereby
supplied to motor 154 by a pump 157. Lines or hoses 158 and 159 carry the fluid to and from hydraulic motor  154. A solenoid operated propor-  controlling the rotational speed of bottom roller head 63. The flow of hydraulic fluid from pump 168 can be preset whereby  the speed of motor 93 will
be substantially constant.
A variable volume pump 173 divan with an electric motor 177 supplies hydraulic fluid under pressure via line 174 to core lift cylinders 39. A return line 176 carries a fluid from cylinders  39 back to the reservoir for pump 173. A proportional
 platform 26. The bell end of mold 24 is located in alignment with opening 32 in turntable 22 as shown in Figure 2. Core 37 is initially raised by operation of hydraulic cylinders 39 to locate the counter rotating packerhead assembly 38 in the bell section of  mold 24.  Pumps  of  162 and  168 are then  op­
valve 178 interpossed in lines 174 and 176 controls the supply of fluid under pressure to cylinders 39 therefore controlling the direction of movement of the core 37 as well as the speed of the movement 

 10 erated to rotate the upper and lower roller heads 62 and 63 respectively in opposite directions. Con­ veyer 148 is then operated with motor 154  to deliver  concrete  156 to  packerhead  essembly  38.
of the core 37 as it moves vertically  relative  to mold 24. A  valve driver board 182 is wired to the solenoids of valve 178 and computer controller  179  Packerhead assembly 62 moves and packs the concrete in the bell section of the pipe. When the power  on upper  roller  head 38 a忧ains a selective
whereby command signals from controller 179 op­ erates valve 178 to control the speed of movement of core 37. Valve 178 has a 『novable spool coupled to the solenoids and a spool position sensor or linear variable differential transducer 183 wired to driver  board  182. 丁ransducer  183  sends  a feed­ 
1s power as sensed power transducer 167, the prog- ramable computer controller 179 signals the valve driver board 182 to operate valve 178 to supply hydraulic fluid under pressure to cylinders 39 and commence the movement of core 37 up into mold
24.  Conveyer  149 contim』iously  supplies  concrete
back  signal  to  driver  board  182  to  monitor  the position  of  the  spool  and  reposition  the  spool  to 20 156 into mold 24 above packerhead assembly  38. Vibrator  147 is operated on the commencement of
obtain the required flow of hydraulic fluid through valve 178 whereby the flow of hydraulic fluid is in accordance with the command signals from com­ puter controller  179. 


2s the movement of core 37 up into mold 24. The counter rotating packerhead assembly 38 distrib­ utes and prepacks the concrete in annular area 98 around  packerhead  assembly  38  to  initially  form
Referring  to  Figure  2,  the  control  system  in­  the  concrete  in a cylindrical  or  pipe configuration.
dicated generally at 175 for the machine has a programable computer controller 179 that gener­ ates  output  command  signals  which  operate  ma­  The counter rotating roller  heads 62 and 63 mini­ mize the circumferential twist on cage 36 and work the  concrete  around  cage  36 as  indicated  by  ar-
chine controls 181, such as  automatic  cycling  of the operations including operating top table wiper, bell feed and stopping the concrete feed at the top 30 rows 186 and 188 in Figures 11 and 12. The resilient sleeves 79 and 79A on the rollers of the upper  and  lower  roller  heads  62  and  63  are  de­
of the pipe as is known in the art. Controller 179 is wired to valve driver  boards  180 and so that com­  formed  into  surface  engagement  as  indicated  at
184 in  Figure  11  and  187 in  Figure  12 to  apply
mand signals from controller 179 control the opera” tion of valves 178 and 160 thereby control the speed  of  conveyor   148  and  amount  of  concrete 35 surface packing forces on the concrete as the rollers move in opposite circumferial directions as indicated  by  arrows  185  and  189  and  rotate  in
being  discharged  into  mold  24 and  control  the  lift speed of core 37 and counter  rotating packerhead  opposite  directions.  The  counter  rotating  packer­ head assembly  38 prepacks  the concrete  prior to assembly  38 mounted theron.  The  rate of vertical 40 compression and vibration of the concrete adjacent
movement  of  core  37  and  counter  rotating  pac­ kerhead assembly  38 is correlated  with the speed  the  outside  of  cylindrical  wall  42  of  core  37.  As core  37  moves  up  into  mold  24  vibrator  42  ; of  operation  of  conveyer  148 to  overcome  exces­  erated  with  a hydraulic  motor  48 vibrates  wall 42
sive overpack and underpack conditions and there­  thereby subjects the concrete between wall 42 and
by ensure substantially uniform concrete  compac­ tion and density throughout the length of te pipe. A representative computer controller is marketed by the Allen  Bradley Company of Milwaukee. Wiscon­ sin as an Allen  Bradley PLC Family controller. Other types and models of programmable comput&shy so mold 24 to vibrations as shown by the arrows in Figure 10. These vibrations densify the  concrete and insure bonding contact of the concrete  with cage 36. As the core 37 moves up into mold 24 the concrete in the lower portions of mold 24 will dampen the vibrations  of  cylindrical  wall 42. Con­
ers can be used in control system 175.  troller  179 is programed  to  increase  the speed of In  use,  mold  24  provided  with  cage  36  is  operation  of  vibrator  43 to  increase the amplitude placed  on  the  pallet  31  resting  on  turntable  22.  and frequency  of the vibrations that are subjected Cage 36 is not used for a non-reinforced concrete  to the concrete in the middle and upper sections of pipe. The turntable  22 is rotated to locate mold 24 55 mold 24 as core 37 moves  to the top of the mold in the pipe making  position  as shown  in Figure 1.  to  compensate  for  the  dampening  effect  of  the
The top of mold 24 is located in alignment with top table  feeding  device  27  incorporated  into  feeding  concrete around core 37.
Returning to  Figure 2. the speed on conveyer
is  controlled  by  hydraulic  motor  154. When there  is  an  oversupply   of  concrete  above  pac­  adapted  to  move  up  into  mold  224  to  form  the concrete  pipe. The counter  rotating rollerhead assembly  38  the  power  used  by  motor 166  for  operating  pump  162 which  supplies  the  sembly   238  is  position  on  top  of  core  237  to prepack  the  concrete  in the  annular  area 298 for hydraulic  fluid  under  pressure  to  motor  94  will s subsequent vibration  action and forming  with core increase.  This   increase  in  power  is  sensed   by  237. Core 237 has a cylindrical wall 242 having a power transducer  167. The power transducer  167  diameter  smaller  than  diameter  of  mold  224.  A signals  controller   179  which  in  turn  signals  the  vibrator  243  is  located  in  the  central  portion  of valve  driver  board  180 to  change  the  position  of  upper end of core 237. Vibrator 243 is constructed
solenoid valve  160 to reduce the operating speed 10 according to the vibrator of U.S. Patent 3,948,354, of motor 154. This reduces the supply of concrete  which issued to M. D. Fosse and W. M. Montgo to  mold  24.  In the  event  that  there  is  an  under  ery  on April 6,  1976, and is supported  on a gen­
supply of concrete above packerhead assembly 38  erally horizontal plate 244 carried on brackets 246 the power for operating pump 162 will be reduced. This  reduction  in  power  used  by  motor  166  is  1s and  secured  thereto  with  a plurality  of  bolts 247. Vibrator  243  has  a  fluid  motor  248  that  is  sensed  by  power  transducer   167  which  in  turn  nected  to  fluid  lines  249  and  251  operable  to
signals controller 179. Controller 179 in turn signals  deliver hydraulic fluid under pressure to motor 248 valve  driver  board  180 to  increase  the  speed  of operation  of  motor  154 and thereby  increase  the  and   thereby   operate   vibrator   243   at   selected speeds amount  of  concrete  that  is delivered  to  mold  24 above  packerhead  assembly  38. The control sys­ 20 The top of cylindrical wall 242 is connected to a  plate  or  cover  259  that  supports  the  counter automatically operates to maintain a pre­  rotating roller head assembly  238. Packerhead as­
determined  supply  of concrete  above the counter  sembly  238  has  an  upper  roller  head  262 and a
rotating  packerhead  assembly  38 so that  packer­  lower roller head 263. Upper roller head 262 has a head  assembly  38 and  core  37 will  have a con­ 2s top  plate  264  carrying  a  plurality  of  upwardly continuious  supply  of  concrete  to  form  the  pipe  in  rected paddles 268 which move concrete generally
mold 24 which  is subjected to substantial  uniform  radial direction into annular space 298 surrounding packing force. Controller  179 is programed to op­ erate  valves  178 and  180 when  the  signal  from  packerhead  assembly  238.  Upper roller head 262 has  a  plurality  of  cylindrical  rollers  269  that  are
power transducer  167 exceeds selected maximum 30 constructed  according  to  roller  69  as  shown  in and minimum values when compared to a selected value.  Figures 5, 6, and 7. Lower roller head 263 also has a  plurality  of  cylindrical  rollers  291  that  are Core 37 continues  to  move upwardly  in mold 24 to  move the packerhead assembly  38 through  structed  according  to  the rollers 69 as  shown  on Figures 5, 6, and 7. top  table  26.  The  concrete  carried  by  the  pac­ 35 The upper and lower roller heads 262 and 263
kerhead assembly 38 is temporarily stored on table top 26. The table top wiper 29 is subsequently operated to move the concrete from top table 26 back into mold 24.  are rotated about a common vertical axis in op­ posite circumferential directions. This rotation is acheived  with  the  use of  in line hydraulic  motors
290  and  298  that  fit  within  the  small  core  237. When  the  pipe is completed  conveyer  148 is 40 Motor  290  is  generally  cylindrical  motor  that  is
stopped.  The  core  37  and  packerhead   38  are  secured with bolts 292 to the bo忧om of plate 259.
moved down to their initial position below turntable
22. Turntable  22 is then rotated to move mold 24  Motor 291 drives a sleeve 292 that is connected to hub 283 that drives the lower roller assembly  291
to the bearing position. Mold 23 is then moved  in the  direction  of  arrow  297. A  pair of  hydraulic
into the pipe forming position wherein the operation 45 fluid  carrying  lines  307 and  308  supply  hydraulic
is repeated to make a second concrete pipe.  fluid  under pressure to motor 291. Lines 207 and
Referring to Figure 13. there is shown a modi­ fication of the concrete pipe making machine and particularly  the drive for the counter rotating pac­  208 are connected to a pump, such as pump 168 and control system 175.
The  second  hydraulic  motor  298  is  mounted kerhead assembly 238. The parts of the machine of so with bolts 299 on motor 291. The motor 298 drives
Figure 13 that correspond to the machine of Fig­ ures 1 to 12 have the same reference numeral with the prefix 哇’'. Figure 13 is a longitudinal sectional view through mold 224 that is similar to Figure 4. A cage  236  is located  within mold 224 to  reinforce  an upright shaft 301 that 1s located within sleeve
293 and drivably connected to hub 266 of the upper roller assembly 262. Motor 298 has a splined output shaft 302 that fits into a spline pocket in the lower end of shaft 301. Other types of drive con­
the concrete pipe. Concrete pipe can be made without cage 236. A cylindrical core 237 having a diameter  smaller  than the diameter  of core 37 is  nections can be used between motor 298 and shaft
301. A pair of hydraulic fluid carrying lines 304 and 306 are operable to supply motor 298 with hydraulic fluid under pressure from a pump such as a variable volume pump  162 shown in Figure 2 that is operatively associated with control system 175 of the  machine.  The  hydraulic  fluid  motors  291  and 298 are operated to  concurrently rotate the upper and lower roller heads 262 and 263 in opposite directions. The power required to rotate the upper roller head 262 is sensed with a power transducer 267 to control the operation of fluid motor 154 used to operate conveyer 148 thereby controlling the level of  concrete  above  the  roller  head assembly
238. The vibrator 243 is operated to vibrate the cylindrical wall 242 of the core 237 to subject the concrete in the mold 242 to vibrations and thereby density the concrete pipe. The operation of the modified machine 200 with the control system 175 is the same as machine 10.
Machine 1O has a core 37 and counter rotating packerhead assembly 38 that is moved up into mold chamber with an extendible and contractible Ii仕 or hydraulic cylinder 39, 41 to make concrete pipe. An alternative machine having core 37 and counter rotating packerhead assembly 38 includes structure to mount the core 37 on a stationary platform or floor below the discharge end of con­ veyor 148. The mold is connected  to  structure, such as  hydraulic cylinders, operable to move the mold down over the core as concrete is discharged into the mold by the conveyor 148. The counter rotating packerhead assembly 38 prepacks the concrete in the moving mold and the. core when vibrated consolidates and densities the concrete.
While there has been shown and described perferred embodiments of the concrete pipe mak­ ing machine having a vibrating core associated with a counter rotating roller head assembly, is under­ stood that changes, modifications, and the structure and materials may be made by those skilled in the art without departing from the invention. The inven­ tion is defined in the following claims.


Claims

1. A machine for making concrete pipe  with use of an upright mold (241 or 244) having a side wall surrounding a mold chamber,  a support  (22) for holding the mold in an upright position, a core (37 or 237) having a top wall (59 or 259) and a side wall (42 or 242) having an upright axis adapted to be moved upwardly into the mold chamber and downwardly out of the mold  chamber,  a vibrator (43 or 243) mounted on the core operable to vibrate the core side wall, a conveyor (148) for discharging concrete into the mold chamber, and a power  lift  (39,  41)  connected  to  the  core  (37 or
237) for selectively  moving the core into and out of the  mold chamber,  characterized  by a counter  rotating packerhead (38 or 238) located above the core top wall to prepack concrete around the pac­ kerhead, sha役 structure (67, 87 or 293, 301) mount­ ing the packerhead  (38 or 238) on the core (37 or
5    237) for rotation about the upright axis of the core, the packerhead having a first head (62 or 262) and a second head (63 or 263) located below the first head, a drive (92 or 290, 298) for rotating the first head (62 or 262)  in a first circumferential  direction
10 and for rotating the second head (63  or  263)  in second circumferential direction opposite the first circumferential direction to work and prepack the concrete in the annular space around the pac­ kerhead adjacent the mold side wall, and the vibra-
15 tor (43 or 243) vibrating the core and  concrete between the core and the mold side wall as the counter rotating packerhead and core are  moved into the mold chamber to form the concrete pipe.
2. The  machine  according  to  Claim  1  char-
20 acterized  by a sensor (167) for sensing the power used by the drive (92 or 290, 298) for turning at least one of the heads and for generating a signal representative of the sensed power, and a control (160, 179, 180) responsive to said signal to control 25 the speed of operation of the conveyor (148)  for directing concrete into the mold chamber and thereby control the rate at which concrete is dis­ charged into the mold chamber.
3. The machine according to Claim 1 or Claim 30 2 characterized by a control (178, 179, 182) for operating the power Ii佼 (39, 41) to move the core
(37 or 237) and packerhead (38 or 238) thereon up into the mold chamber at selected speeds.
4. The  machine  according  to  any  preceding
35 Claim, wherein the power lift (39, 41) comprises a hydraulic  cylinder  (39)  operable  to  move the core
(37) and packerhead (38), a pump (173) for sup­ plying hydraulic fluid under pressure to the cyl­ inder, a valve  (178) for controlling  the flow  of  hy-
40 draulic fluid from the pump to the cylinder thereby controlling the speed of operation of the  cylinder, and  a  control  (179,  182)  connected  to  the  valve
(178) to operate the valve thereby controlling the speed  of  the  movement  of  the  core  and  packerhead  into the said chamber  during the forming of the concrete pipe.
5. The machine according to Claim 4, char­ acterized by a sensor (167) for sensing the power used by the drive (162) for turning at least one of
so the heads and for  generating a signal representa­ tive of the sensed power, the control (179, 182) being responsive to the signal to operate the valve (178).
7. The  machine  according  to  any  preceding claim, wherein the vibrator  (43 or  243)  includes a motor (48 or 248) for operating the vibrator (43 or s
243) at selected speeds to vary the vibrations generated by the vibrator, and a control (179) con­ nected to the motor (48 or 248) operable to in­ crease the speed of the vibrator (43 or 243) there-
by increasing the vibrations as the core (37 or 237)       10
moves up into the mold chamber.
8. The machine according to any preceding claim, wherein the drive (92 or 290, 298) includes a motor  (94 or  298)  operable to turn the  first  head
(62 or 262)  in the first circumferential  direction  at 1s selected rotational speeds, and a control (166, 167) connected  to  the  motor  (94  or  298)  operable  to
vary the speed of operation of the motor to vary the rotational speed of the first head.
9. The  machine  according  to  any  preceding 20
claim. wherein the drive (92) includes a power transmission (92) having a first gear train (114, 117) operably connected to the first head (62) and a second gear train (131, 134) operably connected to
the second head (63). a first motor (94) for driving      2s
the first gear train in a first direction. and a second motor (93)  for driving the second gear train in a second direction opposite the first direction where- by  the  first  and  second  heads  are  driven  in op-
posite directions. 30
10. The machine according to any preceding claim wherein, each head (62, 63 or 262, 263) has a plurality of circumferentially  arranged rollers (69.
91 or  269,  291 ) rotatable  mounted for  rotation
about separate  axes generally  parallel to said up-      35
right axis of the core side wall (42 or 242), the rollers each having outer circumferential portions that move along a circular path having a diameter smaller  than  the  diameter  of  the  core  side  wall
whereby the 「oilers prepack the concrete adjacent      40
the mold side wall to a thickness greater than the thickness of the concrete in the space between the core side wall and mold side wall as the  rollers move along the circular path.

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Concrete Pole Machine Manufacturer

Concrete Pole Machine Manufacturer

Concrete Pole Machine Manufacturer

Concrete Pole Machine Manufacturer