JPH0849652A - Method for washing piping of concrete pump - Google Patents

Abstract

PURPOSE:To enable an elastic filler to be easily and reliably inserted when it is necessary to wash the inside of a piping after the placing work by a concrete pump is completed. CONSTITUTION:After the placing work of ready-mixed concrete is completed, an elastic filler is faced to the front end opening part 7 of a pump cylinder 3, and a pump piston 10 is retreated in this state, and the elastic filler is sucked into the pump cylinder 3. The elastic filler seals water backward from the elastic filler in a state where it is positioned in the pump cylinder 3. After that, the pump piston 10 is pump-operated, and wash water in a hopper 8 is forcibly fed together with the elastic filler, so as to wash the inside of a piping 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for cleaning pipes used in concrete pumps.

[0002]

2. Description of the Related Art A conventional method for cleaning a pipe used in a concrete pump is such that, as already known from Japanese Patent Laid-Open No. 6-81763, a part of an elastic filler is inserted into a cylinder and the side not inserted into the cylinder. One end of the elastic filler is closely attached to the cylinder, the fluid is supplied to the cylinder closed by the conduit penetrating the elastic filler, and the fluid is further supplied to the cylinder by the conduit connected to the cylinder. The elastic filler into the cylinder. After that, by operating a normal pump, the elastic filler and the washing water are passed to wash the inside of the pipe.

[0003]

However, according to the above method, when the fluid is supplied into the cylinder, the air in the cylinder is gradually compressed as the fluid is supplied because the inside of the cylinder is sealed. It has a drawback that it cannot supply smoothly. When the tubular body is removed after inserting the elastic filler, the elastic filler jumps to the hopper side due to the difference between the pressure (atmospheric pressure) on the hopper side and the pressure (compressive force) on the cylinder side of the elastic filler, and the switching valve is switched. There is a risk that the elastic filler will cut.

Therefore, the present invention provides a method for cleaning a pipe of a concrete pump in which an elastic filler for cleaning a pipe can be easily and easily inserted into a pump cylinder and cutting of the elastic filler can be avoided.

[0005]

In order to achieve the above object, the invention set forth in claim 1 provides a hydraulic cylinder behind a pair of left and right pump cylinders, and a hopper in which the pump cylinder opens at the front. A pump piston that is moved back and forth by a hydraulic cylinder is provided in the pump cylinder, and a switching valve that alternately connects a pair of left and right pump cylinders to a pipe extending to a fresh concrete pumping location is provided in the hopper. In a concrete pump that pumps fresh concrete in a hopper through piping by pump operation by forward and backward movement of a pair of pump pistons and swinging of a switching valve, an elastic filler is faced to the hopper side of a pump cylinder after completion of fresh concrete pumping. The elastic filler is drawn into the pump cylinder by the suction force due to the retraction of the pump piston. , The fluid supplied to the rear of the elastic filler is hermetically sealed, and then a pair of left and right pump pistons and a switching valve are pumped to pump the washing water in the hopper together with the elastic filler into the pipe to It is characterized by being washed.

According to a second aspect of the present invention, a hydraulic cylinder is provided at the rear of the pair of left and right pump cylinders, a hopper is provided at the front of the pump cylinder, and a pump cylinder is provided in the pump cylinder. A moving pump piston is provided, and a switching valve that alternately connects a pair of left and right pump cylinders to a pipe extending to a fresh concrete pumping location is provided in the hopper, and the pair of pump pistons move forward and backward and the switching valve swings. In a concrete pump that pumps the fresh concrete in the hopper through the piping by the pump operation by, the elastic filler placed in a soft bag with a small frictional resistance after the completion of the fresh concrete pumping is exposed to the hopper side of the pump cylinder, The filling is drawn into the pump cylinder by the suction force due to the backward movement of the pump piston, The fluid supplied to the rear of the elastic filler is sealed, and then the pair of left and right pump pistons and the switching valve are operated to pump the cleaning water in the hopper together with the elastic filler to clean the inside of the pipe. The feature is that it is made to do.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.
Is a piston type concrete pump, and ready-mixed concrete pumped by the concrete pump 1 can be placed at a predetermined place through a pipe 2. The concrete pump 1 will be described with reference to FIGS. 1 to 3. Reference numeral 3 denotes a pair of left and right cylindrical pump cylinders, and a rear side of the pump cylinder 3 has a center box 5 communicating with a rear end opening 4. A hydraulic cylinder 6 is provided, and a valve casing 9 forming a part of a hopper 8 communicating with the front end opening 7 is provided in the front.

A pump piston 10 is provided on the pump cylinder 3, and a hydraulic cylinder 6 is provided on the pump piston 10.
The hydraulic piston 11 of is connected by a piston rod 12,
When the hydraulic piston 10 reaches the front end of the pump cylinder 3 when the hydraulic piston 10 is at the most forward position, when the hydraulic piston 10 reaches the rear end of the pump cylinder 3 when the hydraulic piston 10 is at the retracted position, the hydraulic piston 10 reaches the most retracted position (see FIG. 2). The pump piston 10 is located in the center box 5 at the position indicated by the chain line.

A switching valve 14 having an S-shaped communication passage 13 is provided in the valve casing 9, and the front portion of the switching valve 14 is rotatably supported by the valve casing 9 and connected to the pipe 2. , The rotation support portion 15 extending from a part of the switching valve 14 is connected to the valve cylinder 16, and the rear end of the switching valve 14 is alternately communicated with the front end openings 7 of the pair of pump cylinders 3 by expansion and contraction of the valve cylinder 16. You can do it. Above the valve casing 9 is a hopper body 1 for storing fresh concrete.
7 are provided.

Reference numeral 18 denotes an elastic filler for cleaning the pipe 2. The elastic filler 18 is made of sponge or the like and has a structure that does not allow passage of fluid. Also, the elastic filler 18
A soft bag with low frictional resistance, such as a plastic bag 1
When it is wrapped in 8'and used, the plastic bag 18 'comes into close contact even if the twisted portion of the elastic filler 18 does not come into close contact with the inner surface of the pump cylinder 3, so that the sealing performance can be improved, and in the pipe 2 It can be possible to move smoothly. Reference numeral 19 is a hose for supplying water into the pump cylinder 3.

The hydraulic circuit will be described with reference to FIG. 3. The main circuit 22 extending from the hydraulic pump 20 and the tank 21 is connected to the pump switching valve 23, the valve switching valve 24, and the cleaning switching valve 25, respectively. There is. The pump switching valve 23 is connected to the front side of each hydraulic cylinder 6 through a pump circuit 26, and the rear part of each hydraulic cylinder 6 is connected to the communication circuit 2.
When the oil is supplied to the front part of one hydraulic cylinder 6, the hydraulic piston 11 moves backward and the hydraulic piston 11 of the other hydraulic cylinder 6 moves forward. By switching, the reverse operation or the hydraulic piston 11 can be stopped.

The valve switching valve 24 is a valve circuit 28.
The valve cylinder 16 is expanded and contracted by switching the valve switching valve 24 so that the switching valve 14 can be swung. The switching valve 25 for cleaning is connected to one hydraulic cylinder 6 through a cleaning circuit 29. In particular, the rear part of the hydraulic cylinder 6 is connected to a position where the hydraulic piston 11 can supply oil even in the last retracted position. The hydraulic piston 11 can be moved to the last retracted position, returned to the original position, or stopped by switching the switch.

Numerals 30 and 31 are a first detection switch and a second detection switch provided on the front part of the hydraulic cylinder 6, and the both switches 30 and 31 detect that the hydraulic piston 11 has reached the most forward position and the valves are detected. The switching valve 24 is switched. Reference numerals 32 and 33 denote a third detection switch and a fourth detection switch, which are provided in the vicinity of the valve cylinder 16, and these switches 32 and 33 switch the pump switching valve 23 by detecting that the valve cylinder 16 is expanded and contracted most. It is like this.

FIG. 10 shows another embodiment in which a hole 34 is formed in the rear portion of the pump cylinder 3 for communicating the inside of the pump cylinder 3 with the atmosphere, and when the hydraulic piston 11 is in the retracted position, the pump piston 10 is in front of the hole 34 ( (Dashed line), and when the hydraulic piston 11 is at the most retracted position, the pump piston 10 is positioned behind the hole 34 (dashed line) so that the front of the pump piston 10 can communicate with the atmosphere and can supply fluid. Has become.

The operation of the present invention having the above-mentioned construction will be described below. First, when pouring fresh concrete, the switching valve 25 for cleaning is kept in the neutral position and the hydraulic pump 20 is maintained.
And the pump switching valve 23 is switched to the right block position. The oil from the hydraulic pump 20 passes through the pump circuit 26 and enters one hydraulic cylinder 6 (lower side in FIG. 3) to retract its hydraulic piston 11, and at the same time, the hydraulic cylinder 6 (upper side in FIG. 3) Hydraulic piston 1
Move 1 forward. When the other hydraulic piston 11 reaches the most advanced position as shown in FIG. 3, the first detection switch 30 detects and the valve switching valve 24 is switched, and the valve cylinder 16
And the switching valve 14 swings toward the other pump cylinder 3 side.

When the valve cylinder 16 is reduced,
Upon detection by the detection switch 33, the pump switching valve 23 is switched to the left block position, and the pair of hydraulic cylinders 6 operate in the opposite manner. By the operation of the pair of hydraulic cylinders 6 and the valve cylinder 3, the fresh concrete in the hopper 8 is alternately sucked into the pair of pump cylinders 3, and the sucked fresh concrete flows through the communication passage 13 of the switching valve 14 and the pipe 2. Through it, it is pumped to a predetermined place for placement.

Next, a description will be given of the cleaning of the pipes after the completion of the casting operation. From the state shown in FIG. 3, the elastic filler 18 is pressed or slightly pushed into the front end opening 7 of the pump cylinder 3 as shown in FIG. The front end opening 7 is sealed. In this state, when the switching valve 25 for cleaning is switched to the right block position and the other hydraulic piston 11 (downward in FIG. 3) is moved to the most retracted position, the elastic filler 18 becomes the suction force of the pump piston 10 as shown in FIG. When the elastic filler 18 is sufficiently intruded, the pump piston 10 comes out of the pump cylinder 3 and is positioned in the center box 5. At that time, if the elastic filler 18 is put in the vinyl bag 18 'and used, the sealing property of the front end opening 7 is enhanced, so that the suction force of the pump piston 10 can surely enter the pump cylinder 3 and cause friction. It has a small resistance and can enter smoothly.

Water is supplied into the pump cylinder 3 by inserting a hose 19 from the rear end opening 4 after the elastic filler 18 has entered. The water is supplied by keeping the gap between the elastic filler 18 and the pump piston 10 so that the elastic filler 18 is not cut by switching the switching valve 14. The gap is maintained by air or the like in addition to water. If possible, air or the like can be used in addition to water. Further, the pump cylinder 3 is tilted as shown in FIG. 6 to collect water in order to lower the ground level of the hopper 8 when mounted on the vehicle body (to facilitate loading from the mixer vehicle).

After the water has accumulated in the pump cylinder 3 to some extent, the cleaning switching valve 25 is switched to the left block position to advance the hydraulic piston 11 to the state shown in FIG. After the hydraulic piston 11 is returned to the original position in this way, the cleaning switching valve 25 is switched to the neutral position, and the pump piston 10 and the switching valve 14 are operated in the same manner as when pouring concrete, and elastic filling is performed as shown in FIG. Material 18 and wash water are pumped. Since water is filled between the pump piston 10 and the elastic filler 18 at the beginning of pressure feeding, a sufficient space is maintained, and the elastic filler 18 is not cut when the switching valve 14 is switched.

When the elastic filler 18 and the cleaning water are pumped and pass through the pipe 2, the inside of the pipe 2 is cleaned and the elastic filler 18 is ejected from the tip of the pipe 2 to complete the cleaning operation.

[0021]

As described above, according to the first aspect of the invention, the elastic filler is made to face the hopper side of the pump cylinder, and is drawn into the pump cylinder by the suction force due to the backward movement of the pump piston, and the elastic filler is further added. Since the fluid is hermetically supplied to the rear of the, the elastic filler can be smoothly inserted into the pump cylinder with a little labor and the inserted state can be maintained. Further, when the pump piston is moved to the maximum forward position, the elastic filler is surely positioned in the switching valve or the pipe, so that the risk of cutting the elastic filler when switching the switching valve can be avoided.

According to the second aspect of the present invention, since the elastic filler is used by being put in a soft bag having a small frictional resistance, the sealability of the front end opening of the pump cylinder is enhanced and the pump piston The elastic filler can be pulled in more reliably by retreating, and the elastic filler can be smoothly moved.

[Brief description of drawings]

FIG. 1 is an overall sectional view of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a hydraulic circuit diagram of a concrete pump.

FIG. 4 is an operation diagram at the initial stage of inserting an elastic filler.

FIG. 5 is an operation diagram when insertion of the elastic filler is completed.

FIG. 6 is an operation diagram when a fluid is supplied into the pump cylinder.

FIG. 7 is an operation diagram when the fluid is sealed in the pump cylinder.

FIG. 8 is an operation diagram when the pump piston is moved forward most.

FIG. 9 is an operation diagram when the elastic filler is put in a bag and used.

FIG. 10 is an overall view showing another embodiment.

[Explanation of symbols]

 1 Concrete Pump 2 Piping 3 Pump Cylinder 5 Center Box 6 Hydraulic Cylinder 8 Hopper 10 Pump Piston 14 Switching Valve 18 Elastic Filling 34 Hole

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shinjiro Omura 2 Tomoe, Besshocho, Miki City, Hyogo Prefecture Far East Development Co., Ltd.

Claims (2)

[Claims] 1. A hydraulic cylinder is provided behind a pair of left and right pump cylinders, a hopper with a pump cylinder opening is provided in the front, and a pump piston that is moved back and forth by the hydraulic cylinder is provided in the pump cylinder. The hopper is provided with a switching valve that alternately connects a pair of left and right pump cylinders to a pipe extending to a fresh concrete pumping location, and a pump valve is operated by forward and backward movement of the pair of pump pistons and swinging of the switching valve. In a concrete pump for pumping fresh concrete through a pipe, the elastic filler is faced to the hopper side of the pump cylinder after the completion of the pumping of the fresh concrete, and the elastic filler is drawn into the pump cylinder by the suction force by the backward movement of the pump piston, The fluid supplied to the back of the elastic filler is sealed, and then a pair of left and right A pipe cleaning method for a concrete pump, characterized in that a pump piston and a switching valve are operated by a pump to pump the cleaning water in the hopper together with the elastic filler into the pipe to clean the inside of the pipe. 2. A hydraulic cylinder is provided at the rear of a pair of left and right pump cylinders, a hopper having a pump cylinder opening is provided at the front, and a pump piston that is moved back and forth by the hydraulic cylinder is provided in the pump cylinder. The hopper is provided with a switching valve that alternately connects a pair of left and right pump cylinders to a pipe extending to a fresh concrete pumping location, and a pump valve is operated by forward and backward movement of the pair of pump pistons and swinging of the switching valve. In a concrete pump that pumps ready-mixed concrete through a pipe, after the completion of the pumping of ready-mixed concrete, the elastic filler placed in a soft bag with small frictional resistance is exposed to the hopper side of the pump cylinder, and the elastic filler is moved by retracting the pump piston. It was drawn into the pump cylinder by suction and supplied to the rear of the elastic filler. The fluid is hermetically sealed, and then a pair of left and right pump pistons and a switching valve are pumped to pump the cleaning water in the hopper together with the elastic filler into the pipe to clean the inside of the pipe. Concrete pump pipe cleaning method.