JPS637339Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a device for cleaning a ready-mixed concrete transport pipe of a concrete pump.

In the ready-mixed concrete transport pipe of a concrete pump, after finishing placing the ready-mixed concrete (hereinafter abbreviated as "ready-mixed concrete"), it is necessary to discharge the remaining ready-mixed concrete inside using an appropriate means and clean the inside of the transport pipe.

Conventionally, as a device for cleaning the above-mentioned transport pipes, a compressor is used to blow air to discharge the ready-mixed concrete and clean it, or
There are known systems that use a turbine pump or a reciprocating pump to discharge and clean fresh concrete using a stream of water. However, when cleaning with air, it is difficult to obtain high air pressure.
The disadvantage is that cleaning long transport pipes is virtually impossible. In addition, turbine pumps have the advantage of being able to discharge a large amount of water and being inexpensive, but it is difficult to obtain high water pressure, making them unsuitable for cleaning long transport pipes. Note that reciprocating pumps are widely used for cleaning long transport pipes because they can produce high-pressure water flow, but pumps with high water flow pressure only discharge a small amount of water. However, since it is necessary to repeatedly spray water, there is a drawback that cleaning takes time.

This invention connects a hydraulic double-acting cylinder having a hydraulic piston with two or more double-acting hydraulic cylinders each having a driven piston connected to the hydraulic piston to operate the hydraulic cylinder, and Each outlet is connected to the ready-mixed concrete transport pipe of the concrete pump via a water supply pipe and a check valve that blocks the flow of fluid toward the discharge port side and frees the flow in the opposite direction, and each inlet port is connected to the fresh concrete transport pipe of the concrete pump on the suction port side. a water supply source via a water intake pipe and a check valve which allows free flow of fluid to and prevents the opposite flow; While communicating with the water supply source, the number of double-acting cylinders for water pressure feeding that communicates with the ready-mixed concrete transport pipe is switched at the branch part of the branch branch pipe for the water supply pipe, and the water pressure feed is disconnected from the ready-mixed concrete transport pipe. The reciprocating cylinder is configured to incorporate a three-way valve that communicates with the water supply source, and the water delivery capacity can be switched between a high-pressure, low-discharge type and a low-pressure, high-discharge type as required. An object of the present invention is to provide a cleaning device for concrete transport pipes that can clean even long transport pipes in a short time.

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

The drawing shows one embodiment of this invention. In the drawing, 1 indicates a hydraulic double-acting cylinder (hereinafter abbreviated as hydraulic cylinder) connected to the auxiliary hydraulic circuit of the concrete pump through a solenoid valve 2. A well-known hydraulic piston 1a and a cylinder rod 1b are provided in the cylinder 1, and the hydraulic piston 1a is reciprocated (reciprocating in the left-right direction in the drawing) by switching the solenoid valve 2. I'm starting to do that. Further, on both sides of the hydraulic cylinder 1 in the length direction, there are first double-acting cylinders 3 (hereinafter referred to as first double-acting cylinders) for water pressure feeding, each of which is arranged at the same central axis position as the hydraulic cylinder 1 and has a cylinder inner diameter larger than the hydraulic cylinder 1. A second double-acting cylinder 4 for water pressure feeding (hereinafter abbreviated as the second cylinder) is provided with the hydraulic cylinder 1 in between. Both ends of the cylinder rod 1b pass through the end wall of the hydraulic cylinder 1 and extend into the first cylinder 3 and the second cylinder 4, and the cylinder rod 1b inside the first cylinder 3 extends to the inside of the first cylinder 3 and the second cylinder 4.
A first driven piston (hereinafter referred to as the first piston) 3a is attached to one end of the cylinder rod 1b, and a second driven piston (hereinafter referred to as the second piston) 4a is attached to the other end of the cylinder rod 1b inside the second cylinder 4. , the first piston 3a and the second piston 4a are adapted to reciprocate together with the hydraulic cylinder 1. A first detection rod 3c passing through the end wall of the first cylinder 3 is installed coaxially with the cylinder rod 1b on the side opposite to the cylinder rod 1b installation side of the first piston 3a, and on the side opposite to the cylinder rod 1b installation side of the second piston 4a. On the opposite side, a second detection rod 4c passing through the end wall of the second cylinder 4 is attached coaxially with the cylinder rod 1b. Then, the positions of the detection rods 3c and 4c are detected on the outside of the first cylinder 3 and the outside of the second cylinder 4, respectively, and the solenoid valve 2 is switched at the vertical dead center of the hydraulic piston 1a. Vertical dead center detectors LS ₁ and LS ₂ such as limit switches that reciprocate are provided.

A suction port and a discharge port are formed opposite to each other at both longitudinal ends of the first cylinder 3, and the suction port on the side opposite to the mounting side of the hydraulic cylinder 1 of the first cylinder 3 is connected to a first branch pipe 3d. through the water intake pipe 5, and the discharge port opposite the intake port is connected to the second branch pipe 3e.
The suction port of the first cylinder 3 on the side where the hydraulic cylinder 1 is attached is connected to the water intake pipe 5 via the third branch pipe 3f, and the discharge port opposite to the suction port are connected to the water supply pipe 6 via the fourth branch pipe 3g. Furthermore, like the first cylinder 3, the second cylinder 4 is also formed with an inlet port and a discharge port, and each inlet port is connected to a fifth branch pipe 4d or a seventh branch pipe 4f as shown in the figure. The water pipe 5 is connected to the water supply pipe 6, and each discharge port is connected to the water supply pipe 6 by a sixth branch pipe 4e or an eighth branch pipe 4g. In addition, each of the branch pipes 3d, 3e, 3
A check valve cv is incorporated in each of f, 3g, 4d, 4e, 4f, and 4g as shown in the figure, and the branch pipe 3
d, 3f, 4d, and 4f so that the fluid flows only in the direction from the intake pipe 5 to the cylinders 3 and 4.
Further, the branch pipes 3e, 3g, 4e, and 4g are configured such that fluid flows only in the direction from the cylinders 3 and 4 toward the water supply pipe 6. The water intake pipe 5 is connected to a required water supply source W, and the water supply pipe 6 is connected to a ready-mixed concrete transport pipe T of a concrete pump. On the other hand, a branch pipe 7 is branched from between the connection part of the water supply pipe 6 to the fourth branch pipe 3g and the connection part of the water supply pipe 6 to the sixth branch pipe 4e, and the branch branch pipe 7 is connected to the water supply source W. The water supply pipe 6 and the water supply source W are connected to the branch part between the branch pipe 7 and the water supply pipe 6.
Either the first cylinder 3 and the ready-mixed concrete transport pipe T are communicated with each other by cutting off the communication with the first cylinder 3, or the first cylinder 3 is
A three-way valve K is incorporated to cut off the communication between the first cylinder 3 and the ready-mixed concrete transport pipe T, and connect the first cylinder 3 and the water supply source W. Note that 8 is a gauge for measuring the internal pressure of the water supply pipe 6 near the ready-mixed concrete transport pipe T.

Next, the operation of this device configured as described above will be explained.

After using the concrete pump, the ready-mixed concrete transport pipe T
To clean the inside of the container, first operate the three-way valve K to cut off the communication between the first cylinder 3 and the ready-mixed concrete transport pipe T, and connect the first cylinder 3 with the water supply source W.
Next, solenoid valve 2 and top/bottom dead center detector
The hydraulic piston 1a is reciprocated in the left-right direction in the drawing by LS ₁ and LS ₂ . Here, the first piston 3a and the second piston 4a reciprocate in the left-right direction together with the hydraulic piston 1a. Therefore, when the pistons 3a, 4a move to the right in the drawing, the pistons 3a, 4a discharge the water in the cylinders 3, 4 to the water supply pipe 6 via the fourth branch pipe 3g and the eighth branch pipe 4g. When the pistons 3a, 4a move leftward, the water in the cylinders 3, 4 is discharged into the water supply pipe 6 via the second branch pipe 3e and the sixth branch pipe 4e. Then, the water sent to the water supply pipe 6 by the first piston 3a returns to the water supply source W, and the water sent to the water supply pipe by the second piston 4a moves to the ready-mixed concrete transport pipe T. here,
It takes almost no load for the first piston 3a to send water to the water supply source W, and the pressure generated by the hydraulic piston 1a can be directly converted into water pressure sending force to the ready-mixed concrete transport pipe T, so water is sent at high pressure. be able to. Therefore, long ready-mixed concrete transport pipes can be cleaned.

By the way, when the cleaning of the ready-mixed concrete transport pipe T progresses to a fraction of the length of the transport pipe T, the pressure value indicated by the gauge 8 decreases. Switch valve K to the first
The water sent by the piston 3a is also sent to the transport pipe T. Then, the hydraulic piston 1 moves the two pistons 3a and 4a, and each piston 3
Although the pressure at which water is sent by cylinders a and 4a decreases, the amount of water sent is increased compared to when the second cylinder 4 is used alone, so the inside of the remaining transport pipe T can be cleaned with a large amount of water, which shortens the cleaning time. can be achieved.

In addition, when sending water to the transport pipe T only by the second cylinder 4, the drive oil pressure of the hydraulic cylinder 1 is set to P.
Kg/cm ² , inflow oil amount Q/min, hydraulic piston 1
The surface area of the first piston 3 is Ccm ² , the surface area of the first piston 3 facing the hydraulic cylinder 1 is A′cm ² , the first piston 3
The surface area on the opposite side to the above is A cm ² , the second piston 4
The surface area of the side facing hydraulic cylinder 1 is B′cm ² ,
If the surface area of the second piston 4 on the opposite side is Bcm ² , the discharge water pressure is P×C/B or P×C/B′, and the discharge water amount is Q×B/C or Q×B′. /C.

On the other hand, when water is sent to the transport pipe T by the first cylinder 3 and the second cylinder 4, the discharge water pressure is P×C/A+B′ or P×C/A′+B, and the discharge water amount is Q ×A+B'/C or Q*A'+B/C.

Here, for simplicity, let A≒A′≒B≒B′,
Assuming that C≒0.5A, when water is sent by the second cylinder 4, the discharge water pressure is P/2Kg/cm ² , the discharge water amount is 2Q/min, and the first cylinder 3 and the second cylinder 4
When water is sent depending on the method, the amount of water discharged is P/4Kg/cm ² and the amount of water discharged is 4Q/min. That is, in the device of this invention, by switching the three-way valve K, water can be pumped into the transport pipe T at high pressure and low discharge rate or at low pressure and high discharge volume, so that even long transport pipes can be efficiently cleaned in a short time. Furthermore, when the cylinders 1, 3, and 4 are fabricated according to the above values to construct the device of this invention and the cleaning is actually performed, the cleaning time is shorter than when using a device using a conventional reciprocating pump.
A reduction of 25-50% is possible.

By the way, the hydraulic cylinder 1 does not need to be provided between the first cylinder 3 and the second cylinder 4, and the number of cylinders driven by the hydraulic cylinder 1 may be two or more.

As explained above, in this invention, a hydraulic double-acting cylinder having a hydraulic piston is connected to two or more double-acting hydraulic cylinders for water pressure feeding each having a driven piston that is connected to and operated by the hydraulic piston. The discharge ports of the double-acting cylinders are connected to the ready-mixed concrete transport pipe of the concrete pump through check valves and water supply pipes, respectively, which block the flow of fluid toward the discharge port side and free the flow in the opposite direction. are connected to a water supply source via a water intake pipe and a check valve, each of which allows free flow of fluid to the inlet side and prevents the opposite flow, and the water supply pipe is branched from the water supply pipe. On the other hand, at the branch part of the branch pipe to the water supply pipe, the number of double-acting cylinders for water pressure feeding that communicate with the ready-mixed concrete transport pipe is switched, and the number of double-acting cylinders for water pressure feeding connected to the ready-mixed concrete transport pipe is changed. A three-way valve is installed to connect the water pressure feeding double-acting cylinders whose communication has been cut off to the water supply source, and the number of double-acting cylinders that send water to the ready-mixed concrete transport pipe can be changed by switching the three-way valve. This makes it possible to wash ready-mixed concrete transport pipes with high-pressure, low-discharge water or low-pressure, high-discharge water, so even long ready-mixed concrete transport pipes can be cleaned first with high-pressure, low-discharge water, and later with low-pressure, high-discharge water. This provides an excellent effect in that cleaning can be done in a shorter time than with conventional high-pressure, low-discharge water-flow type reciprocating pumps.

[Brief explanation of the drawing]

The drawing is a block diagram showing an embodiment of this invention. 1...Hydraulic double acting cylinder (hydraulic cylinder), 1
a... Hydraulic piston, 3... First double-acting cylinder for water pressure feeding (first cylinder), 3a... First driven piston (first piston), 4... Second double-acting cylinder for water pressure feeding (second cylinder), 4a...second driven piston (second piston), CV...check valve, W...
Water supply source, 5... Water intake pipe, 7... Branch pipe, 6...
...Water supply pipe, T...Ready-mixed concrete transport pipe, K...3-way valve.

Claims (1)

[Scope of utility model registration request] A hydraulic double-acting cylinder having a hydraulic piston is connected to two or more double-acting cylinders for water pressure feeding each having a driven piston that is connected to the hydraulic piston and operated, and each of the double-acting cylinders for water pressure feeding has a discharge port. connected to the ready-mixed concrete transport pipe of the concrete pump via a water supply pipe and a check valve that blocks the flow of fluid to the outlet side and frees the opposite flow;
The inlets are each connected to a water supply via a water intake pipe and a check valve that frees the flow of fluid toward the inlet and prevents the opposite flow, and the water supply pipe is connected to the water supply pipe from the water supply pipe. The water supply source is connected to the water supply source through the branched branch pipe, and at the branch part of the branch pipe to the water supply pipe, the number of double-acting cylinders for water pressure feeding that communicate with the ready-mixed concrete transport pipe is switched, A cleaning device for a concrete transport pipe, characterized in that a three-way valve is incorporated to connect a double-acting cylinder for water pressure feeding, which has been disconnected from the pipe, to the water supply source.