JPS5932667B2 - Concrete pump gate valve device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a gate valve device for a concrete pump.

Of the five conventional gate valve devices for concrete pumps, the early one is shown in FIG. 1, and the one currently in use is shown in FIG. 2.

In these drawings, a, a is a vertically symmetrical housing (casing) housing the gate valve device, bl, b
2 is a hole provided in each housing a, C is an operating rod having a gate valve d, e is a bushing for the operating rod that supports the operating rod C in a reciprocating manner, and f is a stopper for the gate valve. , G in Fig. 2 is the seat plate, and in Fig. 1, hydraulic cylinders (not shown) provided at both ends of the operating rod C are actuated alternately to open the holes provided in each part and the housing a. ,, b2 is opened and closed alternately by gate valve d, and stoppers f and f prevent each housing a from being directly hit by gate valve d and being worn out prematurely. Gate valve operating rod C and gate valve stopper f.

When f wears out and needs to be replaced, each part of the housing a will also be worn out by the fresh concrete passing through the holes and tb2, and the housing a will also need to be replaced, increasing running costs.

Moreover, the above-mentioned replacement requires a lot of time, and during that time, there is often a problem that the operation of the concrete pump has to be stopped.

In addition, in addition to the opening/closing action of the gate valve d and the nozzling protection action of the stopper f, the one in Fig.
2g to protect the housing, but the hole b1. which is part of the concrete transport pipe. b
It is unavoidable that fresh concrete comes into contact with the inner circumferential surface of No. 2, and abrasion remains in this area.

However, the same housing a only needs to be replaced once when the operating rod C with the gate valve and the stopper f for the gate valve are replaced 2 to 3 times, reducing running costs compared to the case shown in Fig. 1 above. can.

However, (I) the problem still remains unsolved, even though the number of times the housing a must be replaced is reduced.

(n) The number of parts increases.

(II) High precision is required for each part.

(IV) Since a lot of time and effort is required to assemble the parts, there is a problem that the manufacturing cost increases and the running cost is not sufficiently reduced.

A hollow housing having a hole in the housing wall facing the fresh concrete conduit of the concrete pump, an operating rod supported by the housing so as to be able to reciprocate in a direction perpendicular to the axis of the concrete conduit, and the housing. In a gate valve device for a concrete pump, the gate valve device has a gate valve that opens and closes a hole drilled in the housing wall by moving with the operating rod inside the housing, and the operating rod can reciprocate with the guide plate body that is in contact with the inner surface of the housing. an operating rod supporting part supported by the housing wall; a collar part that covers the inner peripheral surface of the hole drilled in the housing wall and connects to the end of the concrete conduit; and a gate that communicates with the inner hole inside the collar part in a state perpendicular to the inner hole. A gate valve device for a concrete pump, characterized in that a pair of guide plates of the same shape each having a valve guide hole are removably mounted in a housing,
Its purpose is to reduce weight.

Manufacturing costs and running costs can be reduced.

Another object of the present invention is to provide an improved gate valve device for a concrete pump that can shorten concrete pump down time.

As mentioned above, the present invention has a hollow housing that has a hole in the housing wall facing the fresh concrete conduit of a concrete pump, and a housing that enables reciprocating motion in the direction perpendicular to the axis of the concrete conduit. A gate valve device for a concrete pump having a supported operating rod and a gate valve that moves together with the operating rod within the housing to open and close a hole drilled in the housing wall, the guide plate being in contact with the inner surface of the housing. An operating rod support part that supports the main body and the operating rod in a reciprocating manner, a flange part that covers the inner peripheral surface of the hole bored in the housing wall and connects to the end of the concrete conduit, and an inner inner part of the flange part. A pair of guide plates of the same shape each having a gate valve guide hole that communicates with the hole perpendicular to the hole are removably installed in the housing, thereby preventing the housing from coming into contact with the operating rod and causing wear. The support part prevents the housing from abrading due to contact with the gate valve, and the flange prevents the inner circumferential surface of the housing hole from contacting the ready-mixed concrete and causing wear. Contact and wear can be prevented by the guide plate body, and the housing can be made of a material with lower hardness than the conventional one, making it possible to reduce weight and manufacturing cost.

Furthermore, since many parts, the operating rod support and the flange that were conventionally required are integrated into two guide plates, processing costs can be reduced, and from this point of view as well, manufacturing costs can be reduced.

Furthermore, since wear of the housing is completely prevented as described above, there is no need to replace the housing, and since many parts are combined into two guide plates, assembly costs and running costs can be reduced.

In addition, it is only necessary to replace two guide plates and an operating rod with a gate valve, so the replacement can be completed quickly and the down time of the concrete pump can be shortened.

Next, the gate valve device of the concrete pump of the present invention is installed in the third stage.
．． 5. To explain with an example shown in Fig. 6, 1,
1 is a vertically symmetrical housing, which becomes hollow when placed together.

In addition, 2a and 2b are holes drilled in the wall of each housing 1, 3 in Figures 3 and 5 is an operating rod, 4 is a gate valve fixed to the same operating rod 3, and 5.5 is a concrete conduit for connecting the operating rod 3. (7th
23a, 23b and 28a, 28b in the figure) for supporting reciprocating motion in a direction perpendicular to the tube axis, and the actuating rod bushes 5, 5 are connected to the housing 1.
, 1 is held and supported by.

Reference numerals 6 and 6 designate a pair of guide plates of the same shape, each of which includes a guide plate main body 6a, an operating rod support portion 6b that supports the operating rod 3 so as to be able to reciprocate in the above direction, and the housing 1. 1 Holes 2a and 2b drilled in the wall
A flange 6c that covers the inner circumferential surface of the concrete conduit and connects to the end of the concrete conduit, and a gate valve guide hole 6e (see FIG. 6) that communicates orthogonally with the inner hole inside the flange 6c. When each of the guide plates 6 is removably installed in the housing 1, the opposing inner end surfaces of the guide plate bodies 6a, 6a are brought into close contact with each other, and the other outer peripheral surfaces of the guide plate bodies 6a, 6a are attached to the housing 1. 1, the outer end surfaces of the actuating rod supports 6b, 6b are in close contact with the inner end surfaces of the actuating rod bushings 5, 5, and the flanges 6c, 6c are in close contact with the inner surfaces of the housings 1, 1.
The inner circumferential surfaces of the holes 2a and 2b drilled in the wall are covered, and both edges of each of the flanges 6c abut the opening edges of the concrete conduits, thereby connecting the concrete conduits.

Therefore, only the inner circumferential surface of the flange portion 6c directly touches the ready-mixed concrete, and the housing 1 does not directly touch the ready-mixed concrete.

Also, only the actuating rod support part 6b and the actuating rod bushing 5 directly touch the reciprocating actuating rod 3, and the gate valve guide hole 6e directly touches the gate valve 4, which reciprocates with the actuating rod 3. The housing 1 does not directly touch the operating rod 3 or the mocate valve 4, but only the inner surface of the flange 6c and the inner surface of the flange 6c.

Figure 7 shows an example of the configuration of a concrete pump.

In FIG. 7, 21a and 21b are hydraulic cylinders, 2
2a.

22b is a hydraulic piston, 23a and 23b are concrete cylinders (concrete conduits), and 24a.

24b is a concrete piston, 25a, 25b are piston rods connecting the hydraulic pistons 22a, 22b and the concrete pistons 24a, 24b, 26a,
26b, 27a, 27b are hydraulic cylinders for reciprocating the operating rods 3, 3';4' is a gate valve for opening and closing the fresh concrete supply port between the hopper (not shown) and the concrete cylinders 23a, 23b; 28a, 28b connect to the concrete cylinder 2 via the flanges 6c, 6c.
3a, 23b are connected to concrete discharge pipes (concrete conduits); 29 is a switching valve for switching the hydraulic circuits of the hydraulic cylinders 21a, 21b; 30 is the hydraulic cylinder 2;
6 a, 26 b, 27 a.

27b, the gate valve 4' closes the fresh concrete supply port between the hopper and the concrete cylinder 23b, and the gate valve 4 closes the concrete passage ( When closing the inner hole inside the flange 6c,
The concrete piston 24a moves backward and sucks the fresh concrete from the hopper into the concrete cylinder 23a, while the concrete piston 24b moves forward and discharges the fresh concrete in the concrete cylinder 23b into the concrete discharge pipe 28b. At the end of the stroke, the gate valve 4' closes the hopper and concrete cylinder 2.
Close the fresh concrete supply port between 3a and gate valve 4.
is the concrete cylinder 23b and the concrete discharge pipe 2
8b is closed, the concrete piston 24b moves back, and the fresh concrete is transferred from the hopper to the concrete cylinder 23b.
At the same time, the concrete piston 24a moves forward and discharges the fresh concrete in the concrete cylinder 23a to the concrete discharge pipe 28a, and then operates alternately to repeat the suction and discharge of fresh concrete. .

Types of wear in concrete pumps include (I) wear of gate valves due to fluid friction when cutting through fresh concrete;

(n) Wear due to solid friction when metals come into contact.

(m) There are three possible causes of abrasion due to jet flow of fresh concrete.

These wears cause specific damage to different parts of the housing 1.

In order to minimize the wear of the housing 1, the parts exposed to fresh concrete and the parts that come into contact with metal must be minimized.

What is important about this gate valve device is that the operating rod support part 66 prevents the housing 1 from contacting the operating rod 3 and causing wear, and that the collar 6c prevents the housing 1 from contacting the gate valve 4 and causing wear. Prevented, Housing 1
The flange portion 6c prevents the inner circumferential surface of the hole 2at2b from coming into contact with the ready-mixed concrete and being worn out, and the guide plate body 6a prevents the inner surface of the housing 1 from coming into contact with the ready-mixed concrete and being abraded. So, (I) above
, (IIL (m)) The wear on the housing 1 side caused by (m) is completely eliminated.

Note that the housing 1 accounts for more than 50% of the cost of the gate valve device, and preventing wear of the housing 1 and enabling long-term use is extremely important in reducing running costs.

Although the present invention has been described above with reference to embodiments, it goes without saying that the present invention is not limited to such embodiments, and that various design modifications may be made without departing from the spirit of the present invention. .

For example, in FIG. 3, the guide plate 6 is divided into left and right parts, but it may be divided into upper and lower parts and joined together at the surface 6d, as shown in FIG.

[Brief explanation of drawings]

1 and 2 are exploded perspective views showing a conventional gate valve device for a concrete pump, FIG. 3 is an exploded perspective view showing one embodiment of a gate valve device for a concrete pump according to the present invention, and FIG. 4 is an exploded perspective view showing an example of a gate valve device for a concrete pump according to the present invention. FIG. 5 is a perspective view showing an operating rod and a gate valve; FIG. 6 is a perspective view showing a guide plate of the gate device shown in FIG. 3; FIG. 7 is a perspective view showing an example of the structure of a concrete pump. FIG. 1... Housing, 2a, 2b... Hole, 3...
Operating rod, 4...gate valve, 6...guide play),
6a... Guide plate main body, 6b... Operating rod support part, 6c... Flange part.

Claims (1)

[Claims] 1. A hollow housing wall with a hole facing the fresh concrete conduit of the concrete pump,
An operating rod is supported in the same housing so as to be able to reciprocate in a direction perpendicular to the pipe axis of the concrete conduit, and the operating rod moves within the housing to open and close a hole drilled in the housing wall. In a gate valve device for a concrete pump having a gate valve, a guide plate main body in contact with an inner surface of the nozzle, an operation rod support portion that supports the operation rod in a reciprocating manner, and a hole bored in the nozzle wall. a pair of guide plates of the same shape, each having a flange covering the inner circumferential surface of the concrete conduit and connecting to the end of the concrete conduit, and a gate valve guide hole communicating orthogonally with the inner hole inside the flange; A gate valve device for a concrete pump, characterized in that a gate valve device is detachably installed in the housing.