JPS6349569Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a water pressure generating device for a concrete pump.

By a concrete pump with a transport pipe,
When ready-mixed concrete (hereinafter abbreviated as "ready-mixed concrete") is pumped to a pouring site, it is necessary to discharge the ready-mixed concrete remaining in the transport pipe after the pumping work is completed. Conventionally, to discharge the residual ready-mixed concrete mentioned above, in addition to the concrete pump, an air compressor, multistage centrifugal pump, or reciprocating water pump, etc. is connected to the transport pipe, and air or water is pumped into the transport pipe. I tried to do it by myself.

However, if a concrete pump truck is equipped with an air compressor or various pumps as mentioned above in addition to the concrete pump, the weight and scale of the vehicle will increase, resulting in a disadvantage in terms of product cost and the limited availability of vehicles. It is often difficult to equip various pumps within the dimensions.

This idea was devised to solve the above problem. A cylindrical seal member made of an elastic material such as rubber is removably attached to the inside of the swing pipe on the suction port side using an expansion jack. By holding the concrete pump itself and pumping water into the transport pipe, residual ready-mixed concrete in the transport pipe can be discharged without installing an air compressor or various pumps, and the weight and scale of the vehicle can be increased. An object of the present invention is to provide a water pressure generating device for a concrete pump, which can reduce the cost of a concrete pump truck.

This invention will be explained below based on embodiments shown in the drawings.

Figures 1 to 3 show an embodiment of this invention, and A shows a concrete pump equipped with a ready-mixed concrete hopper 1, a pair of concrete cylinders 2, a swing pipe 3, a paddle 4 for stirring the ready-mixed concrete, etc. There is. Concrete cylinder 2,2
connects each discharge port 2a to the peripheral wall 1 of the fresh concrete hopper 1.
A pair of connecting holes 1b adjacent to each other in a.
It is connected to the ready-mixed concrete hopper 1 through communication with the ready-mixed concrete hopper 1. Also, raw corn hopspa 1
Inside, the suction port 3a is connected to the peripheral wall 1a of the ready-mixed concrete hopper 1.
The suction port 3a is alternately connected to the connection holes 1b and 1 by swinging in the directions of arrows A and B in FIG.
A well-known swing pipe 3 is provided which is connected to b. This swing pipe 3 has an inlet port 3a.
A piston 2b, which has a ready-mixed concrete discharge port 3b formed on the opposite side, and which repeatedly approaches and leaves the ready-mixed concrete hopper 1 in the concrete cylinders 2, 2;
The swing pipe 3 swings in response to the reciprocating motion of the concrete cylinder 2b, and when the piston 2b in one concrete cylinder 2 slides in the direction of leaving the ready-mixed concrete hopper 1, the swing pipe 3 connects to the other concrete cylinder 2, The fresh concrete is freely sucked into one of the concrete cylinders 2 and the fresh concrete is pumped freely into the other concrete cylinder 2, and the piston 2b in one of the concrete cylinders 2 slides in the direction approaching the ready-mixed concrete hopper 1. Occasionally,
This one concrete cylinder 2 is connected to the concrete cylinder 2, and the concrete cylinder 2 is connected to the other concrete cylinder 2 to freely pump the ready-mixed concrete inside the concrete cylinder 2.
This allows fresh concrete to be inhaled freely. Note that a fresh concrete transport pipe 5 is connected to the discharge port 3b of the swing pipe 3. After the well-known concrete pump has finished pumping the ready-mixed concrete, the concrete pump itself generates water pressure to pump and discharge the remaining ready-mixed concrete in the transport pipe. Connect the swing pipe 3 to the connecting hole 1 in contact with the inner surface of the
A cylindrical seal member 6 that communicates with b is fitted.
The seal member 6 is made of a rubber material such as natural rubber, nitrile rubber, or urethane rubber.
As a result of experiments conducted by the present applicant, it has been found that the sealing member 6 is preferably made of a natural rubber material with a thickness of 6 to 8 mm and a layer of cloth.

Further, inside the seal member 6, opposing portions of the inner peripheral surface of the seal member 6 are provided with movable plates 7a and 7, respectively.
An expansion jack 7 for fixing the seal member 6 by pressing outward in the radial direction of the seal member 6 at a position a to press the seal member 6 against the inner periphery of the swing pipe 3 is removably provided. The expansion jack 7 moves a pair of opposing moving plates 7a, 7a closer together by rotating the operating rod 7b in the circumferential direction.
The moving plates 7a,
It is designed to be inserted into the seal member 6 with the operating rod 7a facing the inner peripheral surface of the seal member 6 and the operating rod 7b facing the discharge port 3b of the swing pipe 3.
A connecting member 7c is formed at the tip of the operating rod 7b located on the discharge port 3b side of the swing pipe 3 when the expansion jack 7 is inserted into the sealing member 6. The moving plates 7a, 7a of the expansion jack 7 can be moved from the outside of the swing pipe 3 by inserting a handle 8 having a connecting portion 8a into the discharge port 3b of the swing pipe 3 and rotating the handle 8. It's summery.

By the way, in the case shown by D in Fig. 3, sand and pebbles are caught between the swing pipe 3 and the inner surface of the peripheral wall 1a as the swing pipe 3 swings during pressure feeding of ready-mixed concrete, and the sand and pebbles cause wear. This is a worn part formed by being worn away by the high-pressure mortar jet flow leaking from a small gap between the swing pipe 3 and the connecting hole 1b, and one end 6A of the sealing member 6 is When the sealing member 6 is attached to the opening 3a, it protrudes beyond the sliding end of the swing pipe and comes into contact with the worn and concave surface of the plate 1a, thus fulfilling the purpose of sealing. Next, the operation of this device configured as described above will be explained.

After the concrete pump A finishes pumping the fresh concrete, in order to discharge the fresh concrete remaining inside the transport pipe 5, first stop the concrete cylinder 2, and swing the concrete cylinder 2 with the suction port 3a connected to one of the connection holes 1b. The pipe 3 is stopped and then the transport pipe 5 is removed from the swing pipe 3.
Next, the sealing member 6 is attached so that its one end 6A is connected to the peripheral wall 1a.
Insert it until it touches the worn part D of. After this, as shown in FIG.
, connect the handle 8 to the operating rod 7, and rotate the handle 8 to move the moving plate 7a,
7a presses and fixes the seal member 6 against the inner surface of the swing pipe 3. Next, take out the handle 8 from the swing pipe 3, insert the filler that separates water and ready-mixed concrete into the transport pipe 5, connect the swing pipe 3 and the transport pipe 5, fill the ready-mixed concrete hopper 1 with water, and swing it with the concrete cylinder 2. The pipe 3 is operated, water is sent to the transport pipe 5 at high pressure by the piston 2b of the concrete cylinder 2, and residual ready-mixed concrete in the transport pipe 5 is discharged. Here, if the sealing member 6 is not fitted to the swing pipe 3, when attempting to pump water with a concrete pump, water will gush out from the worn portion D, making it impossible to send water at high pressure to the transport pipe 5. In this invention, since the sealing member 6 closes the gap, water can be fed under high pressure. In addition, when cleaning the transport pipe 5, only ordinary water with no sand mixed in is pumped in, and ready-mixed concrete mixed with aggregate is not pumped out. There is no possibility that the raw concrete hopper 1 will get caught between the inner surface of the raw concrete hopper 1 and cause trouble, and the raw concrete hopper 1
One end 6 of the sealing member 6 that is in contact with the inner surface of
Even if A is slightly deformed due to the swinging of the swing pipe 3, if it is a concrete pump that can normally pump fresh concrete, it is unlikely that such a large gap will be created due to the deformation of the sealing member. Since there is no problem, water can be pumped to clean the transport pipes without any problems. In addition, the pumping operation for cleaning takes a shorter time than the transfer work of ready-mixed concrete, and since it only involves pumping ordinary water as mentioned above, even if the sealing member is made of an elastic material such as rubber, , not easy to wear out.

As explained above, the water pressure generating device for the concrete pump of this invention has a cylindrical sealing member made of an elastic material such as rubber inside the suction side of the swing pipe, with one end thereof protruding from the suction port. It is inserted in contact with the inner surface of a ready-mixed concrete hopper, and is removably attached by being pressed against the inner circumference of a swing pipe by a plurality of moving plates of an expansion jack operated by an operating rod,
Because we have made it possible to send water at high pressure to the transport pipes using concrete pumps, residual ready-mixed concrete in the ready-mixed concrete transport pipes can be discharged with high-pressure water flow without the need for air compressors, multistage centrifugal pumps, or reciprocating water pumps, and the transport pipes can be cleaning can be achieved. Furthermore, since there is no need to equip the concrete pump vehicle with an air compressor, multistage centrifugal pump, reciprocating water pump, etc., the weight and size of the vehicle do not increase, resulting in advantages in terms of cost. moreover,
The expansion jack firmly fixes the sealing member within the swing pipe, and the sealing member does not come off even when the swing pipe swings, ensuring reliable communication between the swing pipe and the concrete cylinder.
High-pressure water supply can be achieved stably.

[Brief explanation of the drawing]

The drawing shows one embodiment of this invention.
The figure is a partially cutaway perspective view, FIG. 2 is a sectional view of a main part, and FIG. 3 is a partially enlarged sectional view of FIG. 2. 1... Fresh concrete hopper, 2... Concrete cylinder, 3a... Suction port, 5... Transport pipe, 6... Seal member, 7... Expansion jack.

Claims (1)

[Scope of utility model registration request] A ready-mixed concrete hopper 1, a pair of concrete cylinders 2 connected to the ready-mixed concrete hopper 1, a discharge port 3b at one end connected to a ready-mixed concrete transport pipe 5, swingably provided in the ready-mixed concrete hopper 1, and a suction port at the other end. Mouth 3
A concrete pump equipped with a swing pipe 3 that moves the concrete cylinders along the inner surface of the ready-mixed concrete hopper 1 and connects them alternately to the discharge ports 2a of the pair of concrete cylinders 2. A cylindrical sealing member 6 made of an elastic material such as rubber has one end 6A protruding from the suction port 3a, and the ready-mixed concrete hopper 1
It is inserted in contact with the inner surface of the swing pipe 3, and is detachably attached by being pressed against the inner circumference of the swing pipe 3 by a plurality of moving plates 7a of the expansion jack 7 operated by the operating rod 7b. Water pressure generator for concrete pumps.