JPH058092Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a core removal device for an underdrain forming machine.

(b) Conventional technology The conventional method for manufacturing concrete underdrains is as follows.

Concrete material is poured into a formwork with a core and formed, and after curing for a certain period of time, the concrete culvert is removed from the form. After that, the formwork is assembled again, concrete material is added, and the above manufacturing process is repeated.

(c) Problems that the invention aims to solve However, in the past, each manufacturing process in the above manufacturing method was performed exclusively by hand, although conveyance devices such as cranes and forklifts were used.
It required a large number of workers, was hard work, and was highly dangerous.

In particular, formwork for underdrains has a built-in core, and when demolding, it is essential to remove and reinstall the core, which is a heavy object, but such work can only be done using a crane or forklift. Because the process is a manual process, the work is particularly complicated and time-consuming.

An object of the present invention is to provide a core removal device for an underdrain molding machine that can solve the above problems.

(d) Means for solving the problem The present invention is a core removal device in which a core expansion/contraction mechanism and a core extraction mechanism are attached to one end of a mold with a core in which the core is built so as to be able to move up and down. , and a core deflection prevention device having a core support roller that can be raised and lowered is interposed between the core removal device and one end of the formwork with the core. This relates to a core removal device in a machine.

(E) Functions and Effects With the above configuration, the present invention has the following functions and effects.

The formwork disassembly/assembly process of the formwork with core is carried out using a core desorption device equipped with a core expansion/contraction mechanism and a core extraction mechanism, and an intervening device between the core desorption device and one end of the formwork with core. Since this is done semi-automatically using a built-in core deflection prevention device, the work can be done by fewer workers, and since heavy labor is eliminated, work safety can also be improved.

In particular, the core deflection prevention device reliably supports the core both when removing and inserting the core, making alignment work extremely easy.
Insertion work can be performed quickly and reliably.

Furthermore, the core expansion/contraction mechanism and core extraction mechanism are made movable up and down, and the core support roller of the core deflection prevention device is made movable up and down, so that the core can be moved up and down according to the shape and size of the formwork with the core. The height of the child can be adjusted in the vertical direction, the alignment work described above can be performed more easily, and the removal and insertion work can be performed more quickly and reliably.

(f) Examples The present invention will be described in detail below based on examples shown in the attached drawings.

1 to 4 show the overall configuration of an underdrain forming machine A equipped with a core removal device according to the present invention.

As shown in the figure, the molding machine A is configured to be movable between a mold disassembly/assembly position B and a material input position C, and has a mold mounting and moving device that forms a mold mounting surface on the upper surface. 10, a formwork 11 with a core placed on the same formwork mounting and moving device 10 and having a product P (see Fig. 2) inside, and a formwork disassembly/assembly position B placed on one side. The core attachment/detachment device 12 installed and the core attachment/detachment guide device 13 installed on the other side of the formwork disassembly/assembly position B.
and a product transport device 14 that transports the demolded product P from the mold disassembly/assembly position B to the product storage position D;
It consists of a material input device 15 that inputs material into the formwork 11 with a core after being reassembled at the material input position C.

The configuration of each device will be explained below.

First, the configuration of the formwork mounting and moving device 10 will be explained with reference to FIGS. 1 and 2.

As shown in the figure, the moving device 10 includes a moving cart 21 that is movable on rails 20 laid from a formwork disassembly/assembly position B to a material input position C.
, an intermediate transfer table 22 installed further from the end of the rail 20 toward the material input position C, and a pair of rails 23 installed at a distance below the material input device 15 at the material input position C. It consists of a pair of truck support devices 24 attached to.

In the figure, reference numeral 25 denotes a form introduction table whose end is connected to the starting end side of the rail 20 .

In the above configuration, the moving cart 21, the intermediate transfer table 22, and the formwork introduction table 25 are each
A formwork 1 with a core having a configuration to be described later is placed on its upper surface.
Rolling wheels 26, 27, and 28 each having a V-shaped circumferential groove for moving the roller 1 are attached.

Next, the structure of the core-attached formwork 11 will be explained with reference to FIGS. 5 to 10.

As shown in the figure, the formwork 11 with a core includes a bottom plate 30 made of a long rectangular plate, left and right side plates 31 and 32 connected from both sides of the bottom plate 30 in a direction orthogonal to each other, and a bottom plate 30 and left and right side plates 31 and 32. a pair of end plates 3 connected to both ends of an outer frame body with an upper end opening formed from
3 and 34, and an elongated cylindrical core 35 that is inserted concentrically inside the outer frame.

Note that an underdrain molding space S is formed between the outer frame and the core 35, and a molded and cured product P (see FIG. 5) is formed within the space S.

Further, on the back surface of the bottom plate 30, sliding bodies 36, 36 made of a pair of square steel members are fixedly spaced in a direction orthogonal to the axial direction of the formwork 11 with a core.

Then, the same sliding bodies 36, 36 are moved to the movable trolley 2.
1. By fitting into the V-shaped circumferential grooves of rolling wheels 26, 27, and 28 provided on the upper surfaces of intermediate transfer table 22 and form introduction table 25, formwork 11 with core is movably supported. I can do it.

Furthermore, as is clear from Figures 7 and 8,
The left side plate 31 is integrally connected to the bottom plate 30, but the right side plate 32 has its base end pivoted to the corresponding side edge of the bottom plate 30 by a pivot 37, so that it cannot swing in the width direction. This makes it easy to take out the product P.

In addition, as shown in FIGS. 7 and 8, the core 3
5 is a cylindrical body consisting of a lower half 35a with a rectangular cross section and an upper half 35b with a circular cross section, and the lower half 35a has an opening at the center of the bottom surface. A flexible rubber plate 38 for expanding and contracting the core is installed.

The core 35 can be expanded or contracted by moving the core expansion/contraction rubber plate 38 up and down using a core expansion/contraction mechanism M described below.

That is, the core 35 has the following on both end surfaces:
The end plate 39 and the end plate 40 are fixed together by welding or the like.

Then, to explain the end plate 39 on the side of the core removal device 12, as shown in FIG.
is a fan-shaped member 39a that hangs down from the upper half 35b of the core 35 and has a threaded tube 41 at its hanging end;
side plates 39b fixed to both ends of the lower half 35a of 5;
39b, and further includes side plates 39b, 39
Hook engaging pieces 42, 42 are provided protrudingly from b.

Further, in the above configuration, inside the threaded cylinder 41,
A screw rod 43 is screwed so that it can move forward and backward in the axial direction.

On the other hand, to explain the structure of the end plate 40 on the side of the core attachment/detachment guide device 13, as shown in FIG. It consists of side plates 40b, 40b fixed to both ends of the lower half 35a of the child 35, and has an opening 43a formed in the center.

Furthermore, as shown in FIG. 6, the core 35 has a long operating rod 44 concentrically extending therein, and the operating rod 44 includes a plurality of operating rods 44 arranged at intervals in the axial direction. The core 35 is supported by a lower half 35a and an upper half 35b of the core 35 by a core expansion/contraction link mechanism L.

As shown in FIG. 10, in this embodiment, the core expansion/contraction link mechanism L has one end connected to the operating rod 4.
The upper and lower links 45 and 46 pivotally supported at 4 are bent into a dogleg shape, and the other ends are connected to and separated from the block 47 fixed to the upper half 35b of the core 35 and the rubber plate 38 for expanding and contracting the core. Pivots 49 and 50 are attached to a block 48 fixed to a press plate 48a that presses freely.
A pair of L-shaped links 51, 51, one end of which is pivotally supported on the pivot 50, is connected to the core 3 at the other end.
Rubber mounting plate 5 fixed to the bottom of the lower half 35a of 5
2 and 52.

Further, as shown in FIG. 6, one end of the operating rod 44 is connected to a screw rod 4 screwed into the screw tube 41 so as to be able to move forward and backward.
It is connected to the inner end of 3 by a universal joint 53.

As shown in FIG. 7, the screw rod 43 has an engagement groove 54 on its outer end surface into which an engagement claw 67 of a rotating shaft 66, which will be described later, is inserted.

With this configuration, the engaging claw 67 of the rotating shaft 66
When the rotating shaft 66 is rotated after engaging with the engagement groove 54, the operating rod 44 moves back and forth in the axial direction, and by the same movement, the upper and lower links 45 and 46 that constitute the core expansion/contraction link mechanism L are moved. by bending, and by the same bending, L
The shaped links 51, 51 are bent and the rubber mounting plate 52,
The space between the cores 52 is narrowed or widened, thereby causing the core expansion/contraction rubber plate 38 to move up and down and bend. Therefore, the core 35 is expanded or contracted, and the core 3
5 can be removed and reattached from the outer frame body.

Next, to explain the structure of the mirror plates 33 and 34, the mirror plate 33 on the side of the core attachment/detachment device 12 is provided with an opening 33a having the same shape as the outer shape of the core 35 in the center thereof, as shown in FIG. ing. Also,
Toggle latch mechanisms 33b, 33b are provided on both sides of the toggle latch mechanisms 33b, 33b.
By operating the mirror plate 33, the end plate 33 can be detachably connected to the left and right side plates 31 and 32.

In addition, the end plate 34 on the side of the core attachment/detachment guide device 13 is
As shown in FIG. 8, an opening 34a having the same shape as the outer shape of the core 35 is provided in the center thereof, and a horizontal part 34b is provided in the center of the opening 34a. A core insertion guide shaft 97 forming a part of the core attachment/detachment guide device 13 to be described later.
A guide shaft through hole 34c is formed through which the guide shaft passes through. Further, the mirror plate 34 is provided with toggle latch mechanisms 34d, 34d on both sides thereof, and by operating the toggle latch mechanisms 34d, 34d, the mirror plate 34 is detachably connected to the left and right side plates 30, 31. be able to. Furthermore, the end plate 34 is
On both sides of the horizontal frame portion 34b, there are engaging hooks 101, which constitute a part of the core attachment/detachment guide device 13, which will be described later.
A pair of hook engaging pieces 3 for engaging 101
4e and 34e are provided.

Next, with reference to FIGS. 1 and 6, the configuration of the core detaching device 12, which constitutes the gist of the present invention, will be explained.

As shown in the figure, the core removal device 12 is
A traveling cart 62 that includes a pair of rails 60, 60 extending on the extension of the axis of the formwork 11 with a core, and wheels 61, 61 that roll on the rails 60, 60.
, a core supporting machine frame 64 disposed on the traveling carriage 62 so as to be movable up and down via a vertical guide shaft 63, and a core detaching mechanism attached to the core supporting machine frame 64. .

In the illustrated embodiment, the core attachment/detachment mechanism is
A long fixed support cylinder 65 is attached to the core support machine frame 64, a rotary shaft 66 is rotatably attached within the fixed support cylinder 65, and a rotary shaft 66 is provided at the tip of the screw rod 43 described above. An engaging claw 67 that engages with the engaging groove 54 is provided protrudingly, and the rear end of the rotating shaft 66 is connected to a rotating device 68.
Further, a core supporting disk 69 is attached to the outer peripheral surface of the front end side of the fixed support cylinder 65, and a hook fixed to the end plate 40 of the core 35 is attached to the surface of the core supporting disk 69. It is constructed by protruding an engaging hook 70 that can engage with the engaging pieces 42, 42.

Note that 71 is a lifting mechanism for lifting and lowering the core support machine frame 64.

With this configuration, the traveling carriage 62 is moved to engage the engaging hook 70 with the hook engaging pieces 42 , 42 , and then the engaging claw 67 provided at the tip of the rotating shaft 66 is engaged with the screw rod 43 . After engaging with the matching groove 54,
By rotating the rotating shaft 66, the core 35 can be easily and quickly expanded and contracted uniformly over its entire length in the manner described above.

Thereafter, by moving the traveling carriage 62, the core 35 can be removed from the outer frame as shown in FIG.

However, in the above extraction work, the core 3
5 is in a cantilevered state, there is a risk that the core 35 may bend downward, and after removing the product P from the formwork 11 with the core, the core 35 is reattached to the formwork 11 with the core.
Even if you try to install it inside the device, it may not be possible.

Therefore, in the present invention, a core deflection prevention device 75 is provided on the tip side of the rails 60, 60.

In this embodiment, as shown in FIGS. 6 and 9, the core deflection prevention device 75 is provided with a support stand extending in a direction perpendicular to the rails 60, 60 at the tips of the rails 60, 60. 76 is mounted, the base cylinder 77 of the support stand 76 is attached, a core support cylinder 78 is provided in the base cylinder 77 so as to be movable up and down, and a core support roller 79 is pivotally mounted on the upper end of the core support cylinder 78. It is constituted by supporting.

In this configuration, various types of elevating mechanism for elevating and lowering the core support cylinder 78 are conceivable, but in this embodiment, as shown in FIG. A longitudinal groove 80 is provided, and a protruding shaft 81 protruding from the lower end of the core support cylinder 78 is fitted into the longitudinal groove 80.
A sliding piece 83 having a U-shape in plan view supported by an upper inclined surface 82 is slidably mounted on a support base 76, and the sliding piece 83 is made slidable by a hydraulic cylinder 84. It is composed of:

Moreover, with this configuration, the hydraulic cylinder 8
4, the core support roller 79 can be raised and lowered with a desired force, and with this raising and lowering force, as shown in FIG. 6, the core 35 is effectively supported and the core 35 is pulled out. Also, alignment work during insertion work can be performed automatically, and withdrawal and insertion work can be performed quickly and reliably.

Note that the driving of the hydraulic cylinder 84 is linked to the movement of the traveling carriage 62 that constitutes a part of the core detaching device 12.

That is, the traveling trolley 62, as shown in FIG.
A kicker 85 is provided on the back side, and the core 34
When the traveling carriage 62 is moved backward after connecting the core 35 to the core removal mechanism, the kicker 85 kicks the limit switch, which drives the hydraulic cylinder 84, and the lower surface of the core 35 is removed. can be automatically supported by the core support rollers 79. Also, when inserting the core 35 into the formwork 11 again, the tip of the core 34 should be inserted into the end plate 3.
4, the kicker 85 kicks the limit switch, similarly drives the hydraulic cylinder 84, and can move the core support roller 79 backward.

Next, the configuration of the core attachment/detachment guide device 13 will be described with reference to FIGS. 1, 3, and 6.

As shown in the figure, such a core attachment/detachment guide device 13
92 is a running cart 92 that is equipped with a pair of rails 90, 90 in a direction perpendicular to the axis of the formwork 11 with a core, and wheels 91, 91 that roll on the rails 90, 90.
and a core support guide frame 94 disposed on the traveling carriage 92 so as to be movable up and down via a vertical guide shaft 93.
It consists of a core attachment/detachment guide mechanism attached to the core support guide frame 94.

In the illustrated embodiment, the core attachment/detachment guide mechanism has a long fixed support tube 95 attached to the core support frame 94, and moves back and forth in the axial direction into the fixed support tube 95 by an advancing/retracting mechanism 96. A guide shaft 97 is rotatably attached, and the core 3 described above is attached to the tip of the guide shaft 97.
A fitting hole 99 for fitting the engaging shaft 98 provided at the tip of the operating rod 44 in the fixed support tube 95 is provided, and a disk 100 for supporting the end plate is provided on the outer peripheral surface of the tip side of the fixed support tube 95.
An engaging hook 101, which can be attached to the surface of the mirror plate supporting disc 100 and can engage with the hook engaging pieces 34e, 34e fixed to the mirror plate 34 of the formwork 11 with a core, is attached to the surface of the mirror plate supporting disk 100.
101 is provided in a protruding manner.

Note that 102 is a lifting mechanism for lifting and lowering the core supporting machine frame 94.

With this configuration, the traveling carriage 92 is moved and the engaging hooks 101, 101 are connected to the hook engaging pieces 3.
4e, 34e, and then actuates the toggle latch mechanisms 34d, 34d to separate the end plate 34 from the core-equipped formwork 11. Thereafter, the body movement cylinder 103 is driven to move the traveling carriage 92 in the axial direction. After moving a certain distance, the moving cart 92 is moved in a direction perpendicular to the axis of the formwork 11 with the core, thereby forming a product extraction space in the axial direction of the formwork 11 with the core.

Furthermore, after removing the product P, the end plate 34 can be fixedly connected to the mold frame 11 with the core by the reverse procedure, and after the fixed connection, the guide shaft 97 is inserted into the guide shaft through hole 34c provided in the end plate 34. penetrate inside and then
An engagement shaft 9 provided at the tip of the operating rod 44 inserted into the core-attached formwork 11 by the core removal device 12
8 is inserted into the insertion hole 99 provided at the tip of the operating rod 44, and the core 35 can be further inserted into the formwork 11 with the core while maintaining the same state.

Therefore, the core 35 can be reliably and accurately assembled into the mold frame 11 with a core without bending the core 35 within the mold frame 11 with a core.

At this time, the core expansion/contraction mechanism M and the core extraction mechanism are made to be able to move up and down, and the core support roller 79 of the core deflection prevention device 75 is made to be able to be moved up and down, so that the shape and size of the formwork 11 with the core can be adjusted. The vertical height of the core 35 can be adjusted according to the
Alignment work can be easily performed, and extraction and insertion work can be performed quickly and reliably.

Next, the configuration of the product conveyance device 14 will be explained with reference to FIGS. 1, 2, and 4.

As shown in the figure, the product conveyance device 14 is
A pair of girders 110, 110 extending above the formwork disassembly/assembly position B formed between the core demounting device 12 and the core demounting guide device 13, and the girder 1
Girder support column 111 supporting 10, 110
, a transport cart 113 movably attached to the girders 110, 110 via rolling wheels 112, and a product suspension mechanism 114 placed on the cart 113.

In this embodiment, such a product suspension mechanism 1
In order to prevent damage to the product P, the vacuum suction device 115 is suspended by a hoist 116 so as to be movable up and down.

With this configuration, after disassembling the core-equipped formwork 11, the vacuum suction device 115 is adsorbed to the upper surface of the product P, and then the hoist 116 is driven to slightly lift and move the product P in the axial direction. As a result, the product P can be removed from the core-attached formwork 11, and then the product P can be placed on the movable storage cart 117 installed at the product storage position D, which can be raised and lowered.

In addition, in FIG. 4, 118 is a product reversing device attached to the product storage position D, and the rail 11
The product P on the storage cart 117 that has been moved on the storage cart 117 can be reversed 180 degrees, thereby improving the transportability of the product P and the workability on site.

Next, Fig. 1, Fig. 2, and Fig. 11 to Fig. 1
The configuration of the material input device 15 will be described with reference to FIG. 3.

As shown in FIGS. 1 and 2, material input device 1
5 includes girders 121, 121 supported on the floor by support columns 120;
A traveling trolley 123 is mounted on the vehicle 121 so as to be freely movable via wheels 122, 122;
A material filling hopper 124 is attached to the material filling hopper 124 so that it can be raised and lowered by an elevating cylinder 123a, and a formwork vibrating and swinging device 1 is provided below the material hopper 124.
It consists of 25.

In the above configuration, the material hopper 124 has a material supply port 126 at its upper end and a cutting opening 127 at its lower end. Shutter 129 is attached. Although not shown, a screw-type material cutting machine is provided in the material hopper 124.

In addition, as shown in FIGS. 11 to 13, the formwork vibration and rocking device 125 has side plates 131, 131 erected on both sides of a base 130 fixedly installed on the floor. A rocking table 133 is swingably suspended on a base 130 via rocking shafts 132, 132 pivotally supported at the upper end of the rocking table 131. 132, 132, and the rocking table 133
A pair of vibration tables 135, 135 are elastically supported on the upper surface via elastic support columns 136, 136, and a vibrator 13 is mounted on the back surface of the vibration tables 135, 135.
7, 137 is installed, and rails 138, 138 for supporting the sliding body 36 of the formwork with core 11 are installed on the upper surface thereof, and the same vibration table 13 is installed.
5,135 sliding body clamp mechanism 139,139
The configuration includes the following.

Note that in this configuration, the swing mechanism 134
In this embodiment, as shown in FIGS. 11 and 13, the tip of a horizontal swinging lever 140 that pivots the base end of a swinging shaft 132 is connected to a pneumatic cylinder 141 that is suspended vertically on the floor. It is configured by being pivotally connected to the end of the telescopic rod 142.

On the other hand, each sliding body clamping mechanism 139 has a pneumatic cylinder 143 attached to one side edge of the rocking table 135, and a telescopic rod 144 of the pneumatic cylinder 143.
At the end, a clamp claw 14 clamps the sliding body 36
5 is installed.

With this configuration, the formwork vibration and rocking device 12
After firmly clamping the formwork 11 with core that has been moved above 5 by the sliding body clamping mechanism 139,
While the formwork 11 with core is oscillated by the swing mechanism 134 and vibrated by the vibrators 137, 137, the formwork 1 is removed from the material hopper 124.
Materials can be put into 1.

The underdrain forming machine A according to this embodiment has the configuration described above, and the steps for manufacturing a concrete underdrain using the underdrain forming machine A will be described below.

First, using a forklift or crane,
Formwork 11 with a core containing the product P after molding and curing
is placed on the formwork introduction stand 25, and then placed on the formwork introduction stand 25.
By driving the rolling wheels 28 of No. 5, the formwork 11 with core is
The formwork is moved to the formwork disassembly/assembly position B while being placed on the movable trolley 21.

Drive the core removal mechanism of the formwork removal device 12,
By engaging the engaging claw 67 provided at the tip of the rotating shaft 66 with the engaging groove 54 of the screw rod 43 provided on the end plate 39 of the core 35, and after engaging, rotating the rotating shaft 66. The operating rod 44 is advanced and retreated to drive the core expansion/contraction mechanism M, the core expansion/contraction rubber plate 38 is bent, the core 35 is contracted, and the core 35 is released from the product P.

Next, the engaging hook 70 is engaged with the hook engaging piece 42 provided on the end plate 39 of the core 35, and the movable trolley 6 is
2, the core 35 is removed from the outer frame.

In such sampling work, as mentioned above,
By the operation of the core deflection prevention device 75, the core 3
5 deflection is automatically prevented.

After or in parallel with the core extraction work, the mirror plates 3 forming both ends of the formwork 11 with a core are
3 and 34 are removed from the side plates 31 and 32 by operating the toggle latch mechanisms 33b and 34d, and the end plate 34 engages the engagement hook 101 provided at the tip of the core attachment/detachment guide device 13 with the hook engagement piece 34e. By doing so, it is removed from the formwork 11 with the core.
Next, the core attachment/detachment guide device 13 is moved laterally to form a product extraction space in the axial direction of the mold frame 11 with the core.

Next, the side plate 32 is swung to release the mold from the product P, and the vacuum suction device 115 that constitutes the product conveyance device 14 is activated to adsorb the product P to the top surface of the product P and slightly lift it, thereby moving the traveling cart 113. It travels to bring the product P to the product storage position D, and if necessary, further transports it from the storage position D to the product reversing device 118 and reverses the product P.

After removing the product P from the core-equipped formwork 11 as described above, the inner surface of the outer frame of the core-equipped formwork 11 is cleaned and a mold release agent is applied, and then the above procedure is reversed. By following the procedure, the end plates 33, 34
is fixedly connected to the formwork 11 with a core.

After fixed connection, guide shaft 9 of core attachment/detachment guide device 13
7 into the guide shaft through hole 34c provided in the end plate 34, and then inserted into the formwork 11 with the core by the drive of the core removal device 12. The mating shaft 98 is inserted into the insertion hole 99 provided at the tip of the operating rod 44, and while maintaining the same state, the core 35 is further inserted into the formwork 11 with the core. Complete assembly. In this way, the core 35 can be reliably and accurately moved into the formwork 11 with a core without bending the core 35 within the formwork 11 with a core.
It can be incorporated into 1.

Next, the assembled formwork 11 with the core is moved to the material input position C via the moving cart 21, the intermediate transfer table 22, and the cart support device 24 (with a built-in lifting cylinder).
and placed on the formwork vibrating/swinging device 125.

Thereafter, after the formwork 11 with a core is securely clamped to the device 125 by the sliding body clamping mechanism 139, the formwork 11 with a core is swung by the swinging mechanism 134, and the vibrators 137, 137 are While vibrating, the material is introduced from the material hopper 124 into the formwork 11 with a core. Thereby, the material can be charged into the core-equipped formwork 11 without introducing air or causing segregation.

After the charging is completed, the formwork 11 with the core is transferred to the curing room using a forklift or a crane, and after curing in the same room for a certain period of time, it is placed again on the formwork introducing table 25 of the underdrain forming machine A according to the present invention. Transport.

[Brief explanation of drawings]

FIG. 1 is an overall plan view of an underdrain manufacturing machine equipped with a core removal device according to the present invention, and FIGS. 2 to 4 are side views taken along the arrows in FIG. Fig. 5 is a perspective view of the formwork with core, Fig. 6 is a view taken from Fig. 1 by the arrows, and Figs. 7, 8, and 9 are taken by Fig. 6 - lines, - lines, and - lines. Fig. 10 is an enlarged explanatory view of the main parts of the core, Fig. 11 is a plan view of the formwork vibration and rocking device, and Figs. 12 and 13 are respectively
FIG. 1 is an arrow view taken along the lines shown in FIG. In the figure, A... Underdrain forming machine, 11... Formwork with core, 12... Core removal device, 35... Core, 75
... Core deflection prevention device.

Claims (1)

[Scope of utility model registration request] A core detachment device 12 in which a core expansion/contraction mechanism and a core extraction mechanism are attached so as to be able to move up and down is disposed on one end side of the formwork 11 with a core in which the core 35 is built-in, and the core detachment device 12 A core desorption device for an underdrain molding machine, characterized in that a core deflection prevention device 75 having a core support roller 79 that can be raised and lowered is interposed between the core support roller 79 and one end of the core-attached formwork 11.