JPH0235449Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a demolding device for sleepers and other precast concrete products that are mass-produced in factories.

[Conventional technology]

Sleepers and other precast concrete products that are mass-produced in factories are manufactured by factory production using assembly line operations, and demolding of concrete products from the formwork after curing is carried out using stationary fully automatic demolding equipment, such as Utility Model 57- 73111.

Such demolding equipment is fixed at a fixed position,
The formwork for the concrete product is moved by a roller conveyor or the like and transferred into this demolding device, and the concrete is placed in the demolding device by aligning the top, bottom, left and right of the formwork with the fixed position of the demolding device. Both ends of the product are held and the mold is pulled down to release the mold.
It is fully automated and suitable for mass production using assembly line operations, and is highly effective as a dedicated device.

[Problem that the invention attempts to solve]

However, since such demolding equipment is of a stationary type, it is necessary to provide a certain transfer line in the manufacturing process of concrete products, and it is also necessary to move the formwork. For this reason, the production line is constrained, and when manufacturing a variety of products for multiple purposes, it may not necessarily be appropriate from the viewpoint of efficient use of factory space or simultaneous production of a variety of products.

In addition, transporting the formwork may cause deformation or damage to the formwork, so the formwork must be manufactured with a highly rigid structure, which may be uneconomical in terms of production volume. Moreover, the deformation of the mold may cause a problem in the accuracy of product clamping positioning of the demolding device.

This invention is suitable for highly flexible factory production such as simultaneous multi-variety, high-volume production, such as when the formwork is placed in place and an existing crane is used to place concrete, demold, transport the product, etc. It is an object of the present invention to provide a suspended movable automatic demolding device that can be used.

[Means for solving problems]

An embodiment of the present invention is shown in FIGS. 1 and 2.

Frame 1 represents both end surfaces 11 and 1 of a precast concrete product 10 cast in formwork 20.
1 is suspended from a pair of hanging arms 12, 12 which hold it from both sides. This hanging arm 12 is swung by an actuator 12a, and the pair of left and right hanging arms 2 work together to hold the precast concrete product 10.

Four legs 13 are suspended from the frame 1. The length of the legs 13 can be expanded and contracted,
It consists of a fixed part 14 and a movable piece 15 that slides vertically within the fixed part 14 by a certain distance. The lower end of the movable piece 15 is tapered, and a demolding device positioning part 21 is fixed to the mold frame 20.
It is designed to fit into a cone-shaped hole.

The movable piece 15 is connected to one end of the lever 16 via a pin 16a. This lever 16 is connected at its center to the frame 1 by a pin 16b, and at the other end by a pin 16c to a connecting hardware 17 suspended from the hook of the crane.

Therefore, the frame 1 is lifted by a crane via the connecting hardware 17, the lever 16, the movable piece 15, the fixed part 14, and the pin 16b.

Although the figure shows an example of a device that demolds six concrete products at the same time, any number of devices may be used.

[Effect]

In the left half of FIGS. 1 and 2, the frame 1 is lowered from above the formwork 20 by a crane and placed on the formwork 20, and the hanging arm 12 carries the precast concrete product 10. The right half of FIGS. 1 and 2 shows the clamped position, and the frame 1 is lifted upward by a crane from that state, and the concrete product 10 is placed in the formwork 2.
It shows a state where it is separated from 0. The relationship between the movable piece 15 and the lever 16 shown in the right half is the same as when the frame 1 is lowered and the movable piece 15 hits the positioning part 21.

The device of the invention works as follows.

1 A crane suspends the frame 1 via the connecting hardware 17 and stops directly above the formwork 20. The stopping position of the frame 1 at this time can be easily defined in the upper, lower, left, and right directions using a crane stop position limit switch or other means provided separately according to the position of the formwork 20. At this time, the hanging arm 12
is the lower end (clamping part) by the actuator 12a.
is in an open state.

2. With a slight movement of the crane, the frame 1 is lowered and the tapered end of the movable piece 15 is moved to the formwork 20.
Align it with the mortar-shaped hole of the positioning part 21 provided in the. As a result, the relative positions of the frame 1 and the formwork 20 in the horizontal direction are accurately determined.

3 When frame 1 is further lowered, movable piece 1
5 moves relative vertically within the fixed part 14, and the lever 16 is moved relative to the pin 16 as shown in the right half of FIG.
It swings around b. The movable piece 15 is the fixed part 14
When the frame 1 enters the inside and the length of the leg 13 is reduced to a certain dimension, the frame 1 is placed on the formwork 20 and the crane warp is loosened.

4 When the frame 1 is placed at a fixed position in the vertical direction on the formwork 20, this state is confirmed by a limit switch (not shown), etc., and the actuator 12a moves the hanging arm 12 to the concrete product 10.
It operates so as to press against the end surface 11 of.

In steps 2 and 3 above, frame 1
Since the formwork 20 and the formwork 20 are accurately positioned horizontally and vertically, the hanging arm 12 accurately abuts on the end face of the concrete product 10 at a desired position and clamps the concrete product.

The hanging arm 12 is swingably supported at its intermediate portion by a pin, as in the conventionally known demolding device.
A clamping plate 12b that connects the actuator 15 to the upper end and clamps the end surface of the concrete product at the lower end
have. The clamping plate 12b has protrusions that fit into, for example, a plurality of tapered holes (for example, holes for inserting a PC fixing tool of a post tension) provided on the end face of the concrete product 10, and accurately and reliably clamps the concrete product.

5 Next, when the crane is pulled up, Figures 1 and 2 will appear.
As shown in the right half of the figure, when the connecting hardware 17 rises, the lever 16 pushes down the movable piece 15 and the frame 1 suspends the concrete product 10 from the arm 12.
The concrete product 10 rises while being held in the
is pulled up from the formwork 20 and removed from the mold.

The clamping plate at the lower end of the hanging arm 12 can be configured to be rotatable so that the concrete product can be turned upside down after being demolded.

6 Raise the crane further and move to the next process position with the concrete product suspended.
The actuator 12 moves the hanging arm 12 at a predetermined position.
to release the concrete product, move onto the next formwork 20, return to operation 1 above, and repeat the above.

7 It is of course possible to perform all of the above operations automatically by sequence control.

[Effect of idea]

Since the present invention is configured as described above, it has the following effects.

a Quick, accurate, and fully automatic demolding.

b. It is an inexpensive and high-performance demolding device that uses an existing crane.

c) The structure of the formwork is simple and there is little risk of deformation, so the formwork cost is low and maintenance is easy.
Furthermore, since the formwork is not transferred, there is no need for a transfer device or the like, and the initial investment can be reduced.

d) Parallel production of multiple types or chronological production of multiple types can be easily performed within the same factory, and these can be easily handled by changing the hanging of the demolding equipment.

[Brief explanation of the drawing]

FIG. 1 is a front view of an embodiment of the present invention, and FIG. 2 is a side view thereof. 1...Frame, 10...Concrete product,
DESCRIPTION OF SYMBOLS 11... End face, 12... Hanging arm, 12a... Actuator, 12b... Holding plate, 13... Leg, 1
4... Fixed part, 15... Movable piece, 16... Lever, 16a, 16b, 16c... Pin, 17...
Connecting hardware.

Claims (1)

[Claim for Utility Model Registration] In an apparatus for sequentially demolding a large number of precast concrete products, a frame 1 is provided with swinging hanging arms 12 that sandwich both end surfaces 11, 11 of a concrete product 10, and a formwork 20 is attached to the frame 1. A plurality of extensible and retractable legs 13 of a fixed length are suspended to determine the relative position with respect to the movable leg 13. The movable piece 15 and the connecting fitting 17 are connected by a lever 16 whose one end is pin-connected to the piece 15, the intermediate portion is pin-connected to the frame 1, and the other end is pin-connected to the crane hook connecting metal fitting 17. 1. A demolding device for concrete products, characterized in that the entire structure can be suspended by a crane.