JPH081841Y2 - Core expansion device for underdrain block formwork - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a core expansion / contraction device for expanding / contracting a core of an underdrain block formwork having a core expansion / contraction mechanism.

[0002]

2. Description of the Related Art Conventionally, there is a form shown in FIG. 2 as a mold for manufacturing an underdrain block having a core expanding and contracting mechanism. This form 101 includes a base plate 102 having a rectangular shape, and a pair of side plates 103, which are rotatably connected to opposite long sides of the base plate 102.
104, a movable gable plate 105 rotatably connected to one of opposite sides of the base plate 102, and a fixed gable plate fixed to the other opposite side of the base plate 102 at a right angle to the base plate 102. Section C having one end face connected to the inner wall of the fixed gable plate 106 and arranged parallel to the base plate 102, and having a joint portion 107a on the side surface thereof.
-Shaped core 107 and core expansion and contraction mechanism arranged inside core 107
It is composed of 108 and the form clamping mechanism 109.

Although not shown, the core expansion / contraction mechanism 108 is not shown.
Is a screw rod rotatably supported in parallel with the inner side of the core 107, a plurality of nuts screwed into the screw rod and having screw grooves in opposite directions to each other, A freely linked triangular link, and a bell crank having one end rotatably connected to the apex of the triangular link and two other different positions rotatably connected to both inner walls of the joint 107a of the core 107. By rotating the screw rod head (operated portion) 108a disposed inside the end surface of the core 107 in a predetermined direction, the bell crank tilts due to the deformation of the triangular link, and the inner wall of the joint portion 107a is formed. By pulling both sides inward, the diameter of the core 107 can be reduced, and by rotating the operated portion 108a in the opposite direction, the core 107 can be returned to the original state.

Further, the mold clamping mechanism 109 has a core 10
Nuts that are arranged parallel to each other inside 7 and nuts that are screwed into both ends of the screw rods, and that raise both side plates 103, 104 and movable end plate 105 in order and project from the end face of the core 107. Is inserted into the square hole 105a of the movable gable plate 105, and then the screw rod head 109a is rotated in a predetermined direction. The mold 101 can be tightened by pressing it against the side plates 103 and 104 and the core 107, and the nut can be loosened to open the mold by rotating the screw rod head 109a in the opposite direction.

In the production of the underdrain block using the mold 101, the mold is closed, a concrete is cast from the upper surface of the mold to cure the mold, and then the mold tightening mechanism 109 is operated to move the mold as shown in FIG. State, and then operate the core expansion / contraction mechanism 108 to open the core.
The diameter of 107 is reduced, and then the hardened concrete is pulled out along the core 107 toward the movable end plate 105.

[0006]

By the way, in the above-mentioned mold 101 provided with the core expanding / contracting mechanism 108, not only the basic diameter of the core 107 but also the operated portion of the core expanding / contracting mechanism 108 is changed depending on the size of the mold 101. The position of 108a is very different.

Since only a one-dimensional formwork can flow in a normal manufacturing line, even with a fixed type rotating device, the operated part 108a that is always in the same position is rotated to expand or contract the desired core 107. Can be done. However, in recent years, in various types of small-quantity production, since molds of various sizes are flown into one manufacturing line, it is difficult to follow the fixed rotating device even if a plurality of such devices are installed, There was no choice but to rely on human hands to expand and contract the core.

The present invention has been made in view of the above problems, and an object of the present invention is to enable the core to be properly expanded and contracted even when the position of the operated portion of the core expansion and contraction mechanism differs depending on the form. An object of the present invention is to provide a core expansion / contraction device for an underdrain block formwork.

[0009]

In order to achieve the above object, according to the present invention, a base plate having a rectangular shape, a pair of side plates rotatably connected to respective opposite sides of the base plate, and a base plate The movable gable plate rotatably connected to one of the other opposite sides of the base plate, the fixed gable plate fixed to the other of the other opposite side of the base plate, and one end surface of the fixed gable plate connected to the inner wall of the fixed grate plate with respect to the base plate. Placed in parallel,
And, the core expands and contracts so that the core can be expanded and contracted in the axial direction by the rotation operation of the core having a C-shaped cross-section having a joint portion on its side surface and the operated portion arranged inside the core end surface on the movable end plate side. A core expanding / contracting device for expanding / contracting a core of a formwork for producing an underdrain block having a mechanism, wherein an upper part is detected at a predetermined distance from the operated part on the inner side of the core end face on the movable gable plate side of the formwork. And a lower detection piece below the upper detection piece, respectively, while a core expansion / contraction device is provided at an elevation shaft movable up and down by a drive source provided on the frame and at the lower end of the elevation shaft. The left and right sliders movable in a direction parallel and horizontal to the movable end plate side core end face by the drive source, and the drive source provided in the left and right sliders in the direction orthogonal to the movable end plate side core end face. Possible move-back slider and above-mentioned movable wife to move-back slider It disposed facing the core end surface side,
Further, there is a distance interval between the operation portion that can be engaged with the operated portion that is rotated by the drive source and the operation portion, and a distance interval that matches the distance interval between the operated portion and the upper detection piece, and A core expander / contractor of the underdrain block form is composed of a position detection sensor that is movable in a direction orthogonal to the core end face on the movable end plate side by a drive source provided on the slider.

[0010]

When the core expanding / contracting device of the present invention is expanded / contracted, the drive source for the lifting shaft is first operated when the mold flowing on the manufacturing line is stopped at a predetermined position with respect to the core expansion / contraction device. Then, the elevating shaft is lowered until the position detection sensor reaches the same horizontal level as the lower detection piece of the mold. Next, the drive source for the position detecting sensor is operated to move the position detecting sensor toward the core end surface of the mold by a predetermined distance. Next, the drive source for the left and right sliders is operated to horizontally move the left and right sliders to the position where the position detection sensor detects the lower detection piece. Next, the drive source for the elevating shaft is operated to raise the elevating shaft to a position where the position detection sensor detects the upper detection piece. Next, the drive source for the advancing / retreating slider operates to move the advancing / retreating slider forward, and the drive source for the operating section operates to rotate the operating section in a predetermined direction.

Since the distance between the operating portion of the core expansion and contraction device and the position detection sensor is equal to the distance between the operated portion of the mold and the upper detection piece, the operating portion is covered during the forward movement. The operating portion is engaged, and the operated portion is rotated in a predetermined direction by the engagement to expand and contract the core.

[0012]

1 and 3 to 16 show an embodiment of the present invention. FIG. 1 is a side view of a core expanding / contracting device, FIG. 3 is a rear view of the core expanding / contracting device, and FIG. 1 is an enlarged view of an essential part of FIG. 1, FIG. 5 is an enlarged view of an essential part of FIG. 1, FIG. 6 is a front view of FIG. 5, FIG. 7 is a perspective view of the mold in a mold closed state, and FIG. FIG. 9 is a perspective view, FIG. 9 is a front view of a core, FIG. 10 is a front view of a core in a reduced diameter state, FIG. 11 is a perspective view of a core expansion / contraction mechanism, and FIG. 12 is a block diagram of a control system of the core expansion / contraction device. FIG. 13 is an operation control flowchart, and FIGS. 14 to 17 are operation explanatory diagrams relating to core expansion and contraction.

First, with reference to FIGS. 7 to 11, the structure of the formwork for manufacturing the underdrain block used in this apparatus will be described.

A mold 1 whose open / closed state is shown in FIGS. 7 and 8 is a pair of a rectangular base plate 2 and a pair of rotatably connected opposite long sides of the base plate 2. The side plates 3 and 4, the movable end plate 5 that is rotatably connected to one of the opposite sides of the base plate 2 on the short side, and the other end of the base plate 2 that is opposite to each other are fixed at right angles to the base plate 2. A fixed gable plate 6, a core 7 having a C-shaped cross section, which is supported by the inner wall of the fixed gable plate 6 in a mold-held state and is arranged in parallel to the base plate 2 and has a joint portion 7a on its side surface. 7 core expansion / contraction mechanism 8 and mold clamping mechanism 9
And the detection piece 10. A square hole 5a into which the nut 9b of the mold clamping mechanism 9 can be inserted is formed in the upper portion of the movable end plate 5, and the upper and lower corners of the square plate 5a have side plates 3a.
4 has a hole 5b formed at the upper end of the side edge thereof, into which the positioning pins 3a, 4a can be inserted.

As shown in FIGS. 9 and 11, the core expanding / contracting mechanism 8 is provided with a screw rod 8a which is rotatably supported parallel to the inside of the core 7 and rotatably supported by the screw rod 8a. Two sets of nuts 8b screwed together and having screw grooves in opposite directions,
A triangular link 8c rotatably connected to each nut 8b forming a set, and one end rotatably connected to the apex of each triangular link 8c, and the other two different positions of the joint 7 of the core 7. A hexagonal head portion of a screw rod 8a, which is composed of a bell crank 8d rotatably connected to both sides of the inner wall via brackets and serves as an operated portion 8e, is disposed inside the end surface of the core 7. In this core expansion / contraction mechanism 8, the operated portion 8 is
By rotating e in the counterclockwise direction in the figure, each triangular link 8c is deformed and its apex is moved in the direction of the screw rod 8c to tilt each of the bell cranks 8d, so that both inner walls of the joint 7 are inwardly moved. The diameter of the core 7 can be reduced by pulling it in (see FIG. 10). Further, the core 7 can be returned to the original state by rotating the operated portion 8e in the opposite direction.

As shown in FIG. 9, the mold clamping mechanism 9 includes a screw rod 9a arranged in parallel with the inside of the core 7,
The screw rod 9a has nuts 9b screwed into both ends thereof, and a hexagonal head portion of the screw rod 9a to be the operated portion 9c and a nut 9b project from the end surface of the core 7. In the mold clamping mechanism 9, in the state shown in FIG. 8, the side plates 3 and 4 and the movable end plate 5 are raised in order and the nut 9b is attached to the square hole 5a of the movable end plate 5.
And then the operated portion 9c is rotated in a predetermined direction, so that the two gable plates 5, 6 and the side plates 3, 4 and the middle plate are rotated by a nut 9b whose rotation is restricted during the rotation and moves toward the center. The mold 1 can be tightened by pressing it against the child 7, and by rotating the operated portion 9c in the opposite direction in the state of FIG. 7, the nut 9b is loosened and returned to the original state. The plates 3 and 4 can be turned over in order.

The detection piece 10 is, as shown in FIG.
A square lower detection piece 10a and an upper detection piece 10b,
A support plate 10c for fixedly supporting the detection pieces 10a and 10b on the inner wall surface of the core 7 is arranged inside the end surface of the core 7. The lower detection piece 10a and the upper detection piece 10b have their center lines aligned with each other and have a predetermined interval in the vertical direction. Further, the upper detection piece 10b is disposed slightly above the operated portion 8e of the core expansion and contraction mechanism 8 with a predetermined left-right distance L1, and the lower detection piece 10a is a base. It is arranged with a predetermined height interval from the plate 2. Further, both detection pieces 10 in the detection piece 10
Although the distance from the inner wall surface of the core 7 of a and 10b and the vertical distance between the lower detection piece 10a and the upper detection piece 10b are changed according to the size of the mold, the height position of the lower detection piece 10a. (LR) and the positional relationship between the upper detection piece 10b and the operated portion 8e are set to be the same even when the dimensions of the mold are different.

The production of the culvert block by the formwork 1 is as follows.
Similar to the formwork shown in FIG. 2, after the formwork 1 is closed and a concrete is cast from the upper surface for curing, the formwork tightening mechanism 9 is operated to bring the formwork 1 to the state shown in FIG. Then, the core expansion and contraction mechanism 8 is operated to reduce the diameter of the core 7, and then the hardened concrete is pulled out along the core 7 toward the movable end plate 5 side.

Next, referring to FIGS. 1 and 3 to 6,
The configuration of the core expansion / contraction device will be described.

The core expanding / contracting device whose side and back sides are shown in FIGS. 1 and 3, respectively, has a frame 21, a length adjusting slider 22 disposed horizontally on the upper surface of the frame 21, and a length adjusting slider 22. Up and down shaft 2 which is vertically movable on the height adjusting slider 22
3, left and right sliders 24 horizontally movably arranged at the lower end of the elevating shaft 23, forward and backward sliders 25 horizontally movably arranged on the left and right sliders 24, and rotatable operation portions provided on the forward and backward sliders 25. 26 and a position detection sensor 27 which is horizontally movable on the left and right sliders 24.

The frame 21 is established on the ground J or the like so as to be orthogonal to the carrying direction of the mold 1 and to cover the mold 1, and as shown in FIG. A pair of guide rails 21a which are orthogonal to the end face of the core 7 of the frame 1 and are horizontal
have. An air cylinder 21b for driving a length adjusting slider 22 described later is arranged on the frame 21.

As shown in FIG. 4, the length adjusting slider 22 has a plurality of guides 22a vertically provided on the lower surface thereof slidably fitted to the guide rails 21a, and the air adjusting member 22a. The rod 21c of the cylinder 21b is connected to one end thereof. Further, the length adjusting slider 22 is provided with a lift motor brake motor 22b for driving a lift shaft 23, which will be described later, and a pair of ball guides 22c for guiding the lift shaft 23 in the vertical direction. ing.

As shown in FIGS. 4 to 6, the elevating shaft 23 has a guide rail 23a attached to its side surface along the longitudinal direction slidably fitted to the ball guide 22c. There is. A horizontal flat plate 23b is connected to the lower ends of the two lifting shafts 23, and a pair of guide rails parallel and horizontal to the end face of the core 7 of the mold 1 is provided on the lower surface of the flat plate 23b.
23c is provided. A chain block 23d is projected on the upper surface of the flat plate 23b, and a chain 23e connected to the chain block 23d is wound around the sprocket 22d of the break motor 22b. The left and right sliders 24, which will be described later, are provided on the lower surface of the flat plate 23b.
An air cylinder 23f for driving the is arranged.

The left and right sliders 24 are, as shown in FIGS. 5 and 6, a plurality of guides 24a projecting from the upper surface thereof.
Is slidably fitted to the guide rail 23c,
The rod 23g of the air cylinder 23f is connected to one end thereof. Further, on the lower surface of the left and right sliders 24, a pair of horizontal guide rails 24b orthogonal to the end surface of the core 7 of the mold 1 and an air cylinder 24c for driving an advancing / retreating cylinder 25 described later are arranged. Further, an air cylinder 24d that drives a position detection sensor 27 described later is arranged on one side of the lower surface of the left and right sliders 24.

The advancing / retreating slider 25 has a box shape as shown in FIG.
As shown in FIG. 6, a plurality of guides 25a projectingly provided on the upper surface of the guide rail 24bc are slidably fitted to the guide rail 24bc, and the rod 24 of the air cylinder 24c.
d is connected to one end thereof. Also, advance / retreat slider 2
Reference numeral 5 denotes, inside thereof, a rotary shaft 25b which is orthogonal to the end face of the core 7 of the mold 1 and is horizontal, and one end of the rotary shaft 25b is provided with the belt 2
5c and a motor 25b for an operating portion which rotates via 5c, and the operating portion 26 is provided at the other end of the rotary shaft 25b.

The operating portion 26 has a hexagonal socket shape,
The operation portion 26 of the mold 1 can be engaged with the operation portion 26. A torque limiter 26a is provided between the operating portion 26 and the rotating shaft 25b.

The position detection sensor 27 is composed of a magnetic proximity switch with a built-in amplifier, and can detect the upper and lower detection pieces 10a, 10b of the mold 1 by mutual approach. This position detection sensor 27 is shown in FIGS.
As shown in FIG. 5, the support piece 27a fixed to the back side is connected to the rod 24e of the air cylinder 24d so that it can move toward the end surface of the core 7. Further, the distance between the position detecting sensor 27 and the operating portion 26 is such that the operated portion 8e of the mold 1 and the upper detecting piece 10 are separated from each other.
It corresponds to the distance interval L1 from b, and the upper position detection piece 1
Like 0b, it is arranged slightly above the operation unit 26.

The symbol P in FIGS. 1 and 3 to 6 is used.
Is a pallet on which the formwork 1 is placed sideways, and K is a motor-driven roller conveyor that conveys the pallet P in one direction.

Next, the configuration of the control system of the core expansion / contraction device will be described with reference to FIG.

In the figure, 31 is a length detecting sensor provided on the roller conveyor K. The sensor 31 is a magnetic type proximity switch, and a detecting section (not shown) provided on the side surface of the pallet P. Is detected to detect the longitudinal length of the mold 1 being conveyed. In this embodiment, the total length is 2 m and 1.5 m.
The pallet P on which the 2 m formwork is placed is not provided with a detection unit, and the pallet P on which the 1.5 m formwork is placed is provided with a detection unit to identify the two. Can be performed based on the detection signal of the length detecting sensor 31.

Reference numeral 32 is a sensor for adjusting position detection provided on the length adjusting slider 22. The sensor 32 is composed of a limit switch and indicates that the length adjusting slider 22 has moved a predetermined distance in accordance with the entire length of the mold. Detect.

Reference numeral 33 is a sensor for detecting a lowered position provided on the elevating shaft 23. The sensor 32 is composed of a limit switch, and the position detecting sensor 27 is the same as the lower detecting piece 10a of the mold 1 when the elevating shaft 23 is lowered. Detects that it has descended to the horizontal level.

Reference numeral 34 is a sensor for detecting the forward movement position provided on the left and right sliders 24. The sensor 33 is composed of a limit switch and detects that the position detection sensor 27 has moved forward to a predetermined position.

Reference numeral 27 is a position detecting sensor, 22b is a brake motor for a lifting shaft, 21b is an air cylinder for a length adjusting slider, 23f is an air cylinder for left and right cylinders, and 2f.
Reference numeral 4c is an air cylinder for a forward slider, 27b is an air cylinder for a position detection sensor, and 25b is a motor for an operating portion.

Reference numeral 35 is a power supply circuit for supplying drive power to the brake motor 22b for the lifting shaft, and 36 is each air cylinder 2
Reference numeral 1b, 23f, 24c, and 27b is an air circuit for supplying driving air, and 37 is a power supply circuit for supplying driving power to the operating section motor 25d.

Reference numeral 38 is a control circuit having a micro computer configuration, which controls signals to the power supply circuits 35 and 37 and the air circuit 36 in accordance with the programs stored in the memory on the basis of the detection signals of the sensors 31, 32, 33, 34 and 27. Is sent.

Next, with reference to FIG. 13 and FIGS. 14 to 17, the operation of the above-described core expansion / contraction device will be described.

When the mold opening is completed and the mold 1 conveyed by the roller conveyor K is stopped at a predetermined position with respect to the core expanding / contracting device, the length detecting sensor 31 determines the longitudinal length of the mold 1. Detect (step 1). At this stop position, as shown in FIG. 13, the central axis S2 of the position detection sensor 27 is displaced from the central axis S1 of the mold 1 by a distance L2 to the left.

When no special detection signal is obtained from the length detecting sensor 31, that is, when the 2 m frame is stopped, as shown in FIG. 14, the breaker motor 2 for the lifting shaft is used.
The brake of 2b is released, the brake motor 22b is rotated in the reverse direction, and the lifting shaft 23 is lowered (step 2). A sensor 32 for detecting the lowered position is obtained by lowering the lifting shaft 23.
When the detection signal is obtained from the break motor 22
A brake is applied to b to stop the descent (steps 3 and 4). At this stop position, the position detection sensor 27 is at the same horizontal level as the lower detection piece 10a of the mold 1, and the center axis S2 of the position detection sensor 27 is on the left side with respect to the center axis S1 of the form 1 as described above. The distance L2 is shifted.

When the lowering of the elevating shaft 23 is stopped, the air cylinder 27b is operated to advance the position detection sensor 27 toward the end face of the core 7 of the mold 1 (step 5). When a detection signal is obtained from the forward position detecting sensor 34 by the forward movement of the position detecting sensor 27, the operation of the air cylinder 27b is stopped (step 6,
7). At this stop position, the position detection sensor 27 approaches the upper and lower detection pieces 10a, 10b to a distance at which they can be detected.

When the forward movement of the position detecting sensor 27 is stopped, as shown in FIG. 15, the air cylinder 23f is operated to move the left and right sliders 24 to the right in the figure (step 8). When a detection signal is obtained from the position detection sensor 27 by the movement of the left and right sliders 24, the operation of the air cylinder 27b is stopped (steps 9 and 10).
At this stop position, the position detection sensor 27 detects the lower detection piece 1
0a, and the operation part 26 is the operated part 8 of the formwork 1.
Located below the perpendicular of e.

When the position detecting sensor 27 has stopped moving to the right, as shown in FIG.
The actuator 22b is operated to wind up the chain 23e to raise the elevating shaft 23 (step 11). This lifting shaft 23
When the detection signal is obtained from the position detection sensor 27 due to the ascent, the operation of the brake motor 22b is stopped (steps 12 and 13). At this stop position, the position detection sensor 27 matches the upper detection piece 10b, and the operation part 26 matches the operated part 8e of the mold 1.

When the lifting of the lifting shaft 23 is stopped, the air cylinder 24c is operated to move the forward / backward slider 25, that is, the operating portion 26 toward the operated portion 8e, and thereafter the motor 25d for the operating portion is moved. The operation part 26 is rotated to rotate in a predetermined direction (steps 14 and 15). By this movement, the operating portion 26 engages with the operated portion 8e, and after the engagement, the operated portion 8e rotates in the same direction and the core 7 expands and contracts.

When the operated portion 8e is rotated to the limit, the torque limiter 26a of the operating portion 26 operates, and the addition of the rotational force is suppressed. After that, the rotation of the operation unit 26 is stopped, the advancing / retreating slider 25 and the position detection sensor 27 are sequentially retracted, the elevating shaft 23 is moved up, and the left and right sliders 24 are moved leftward, so that FIG. The process returns to the standby state (step 16).

On the other hand, when the pallet P on which the 1.5 m frame is placed is stopped, the sensor for detecting the length of the pallet P is detected in step 1 by the sensor 31 for length detection. When the detection signal is obtained from the length detecting sensor 31, the air cylinder 21b is operated to move the length adjusting slider 22 to the end face of the core 7 of the formwork 1 before lowering the elevating shaft 23. (Step 17). When the detection signal is obtained from the sensor 32 for detecting the adjusted position by the movement of the length adjusting slider 22, the operation of the air cylinder 21b is stopped (steps 18 and 19).
At this stop position, the position detection sensor 27, the operation section 26, etc. move 0.5 m closer to the mold 1 than before moving. The subsequent operation is the same as above.

As described above, according to the present embodiment, the lower detection piece 10 provided in the vicinity of the operated portion 8e of the core expanding / contracting mechanism 8.
Since the operation part 26 can be guided to the operated part 8e by sequentially detecting the position a and the upper detection piece 10b by the position detection sensor 27, the position of the operated part of the core expansion / contraction mechanism greatly differs for each mold. Even in each case, the operated part 8e is replaced by the operating part 2
The core 6 can be reliably caught and the core 8 can be properly expanded and contracted. This makes it possible to significantly reduce the work related to core expansion and contraction compared with the conventional method, and it is also sufficiently adapted to the demand for high-mix low-volume production. There are advantages.

Further, since it is possible to detect the total length of the mold flowing in the initial stage of the expansion and contraction operation and adjust the apparatus itself so as to correspond to the total length of the mold, it is common to molds of various lengths. The device is capable of expanding and contracting the core, which has the advantage of further labor saving and efficiency improvement.

In the embodiment, the present invention is applied only to the expansion and contraction of the core, but the tightening and loosening of the mold tightening mechanism (9 in the figure) which requires the same rotating operation and the underdrain. The present invention may be applied to tightening and loosening a hole forming pin retracting mechanism (not shown) used when forming a hole in a block.
Further, the drive source such as the motor and the air cylinder shown in the embodiment may be replaced by a drive source other than that shown in the drawings.

[0049]

As described above in detail, according to the present invention,
The operating part can be guided to the operated part by sequentially detecting the lower detection piece and the upper detection piece provided in the vicinity of the operated part of the core expansion / contraction mechanism with the position detection sensor. Even if the position of the operated part of the child expansion mechanism is greatly different,
Each operated part can be reliably caught by the operating part and the core can be expanded and contracted appropriately, which greatly saves the work related to core expansion and contraction compared with the conventional method, and enables high-mix low-volume production. There is an advantage that it can be sufficiently adapted to the request.

[Brief description of drawings]

FIG. 1 is a side view of a core expansion / contraction device showing an embodiment of the present invention.

FIG. 2 is a perspective view showing a conventional formwork.

FIG. 3 is a rear view of the core expansion / contraction device.

FIG. 4 is an enlarged view of a main part of FIG.

5 is an enlarged view of a main part of FIG.

6 is a front view of FIG.

FIG. 7 is a perspective view of the mold in the mold closed state.

FIG. 8 is a perspective view of the mold in the mold open state.

FIG. 9 is a front view of the core.

FIG. 10 is a front view of the core in a reduced diameter state.

FIG. 11 is a perspective view of a core expansion / contraction mechanism.

FIG. 12 is a block diagram of a control system of the core expansion / contraction device.

FIG. 13 is a flowchart for motion control.

FIG. 14 is an operation explanatory diagram relating to core expansion and contraction.

FIG. 15 is an operation explanatory diagram relating to core expansion and contraction.

FIG. 16 is an explanatory diagram of an operation relating to core expansion and contraction.

FIG. 17 is an operation explanatory diagram relating to core expansion and contraction.

[Explanation of symbols]

1 ... Formwork, 2 ... Base plate, 3, 4 ... Side plate, 5 ... Movable gable plate, 6
... Fixed gable plate, 7 ... Core, 8 ... Core expansion / contraction mechanism, 8e ... Operated part, 10a ... Lower detection piece, 10b ... Upper detection piece, 21
... frame, 22b ... break motor, 23 ... elevating shaft,
23f ... Air cylinder, 24 ... Left and right sliders, 24c ...
Air cylinder, 25 ... Forward / backward slider, 25a ... Motor,
26 ... Operation part, 27 ... Position detection sensor, 27b ... Air cylinder.

Claims (1)

[Scope of utility model registration request] 1. A rectangular base plate, a pair of side plates rotatably connected to each one of the opposite sides of the base plate, and a rotatably connected one of the other opposite sides of the base plate. A movable gable plate, a fixed gable plate fixed to the other of the other opposite sides of the base plate, and one end face is connected to the inner wall of the fixed gable plate and arranged parallel to the base plate,
And, the core expands and contracts so that the core can be expanded and contracted in the axial direction by the rotation operation of the core having a C-shaped cross-section having a joint portion on its side surface and the operated portion arranged inside the core end surface on the movable end plate side. A core expanding / contracting device for expanding / contracting a core of a formwork for producing an underdrain block having a mechanism, wherein an upper part is detected at a predetermined distance from the operated part on the inner side of the core end face on the movable gable plate side of the formwork. And a lower detection piece below the upper detection piece, respectively, while a core expansion / contraction device is provided at an elevation shaft movable up and down by a drive source provided on the frame and at the lower end of the elevation shaft. The left and right sliders movable in a direction parallel and horizontal to the movable end plate side core end face by the drive source, and the drive source provided in the left and right sliders in the direction orthogonal to the movable end plate side core end face. Possible move-back slider and above-mentioned movable wife to move-back slider It disposed facing the core end surface side,
Further, there is a distance interval between the operation portion that can be engaged with the operated portion that is rotated by the drive source and the operation portion, and a distance interval that matches the distance interval between the operated portion and the upper detection piece, and A core expansion / contraction device for an underdrain block form, comprising a position detection sensor movable in a direction orthogonal to the core end face on the movable end plate side by a drive source provided on a slider.