JPH0826851B2 - Discharge method of residual viscous fluid - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure-feeding device such as a piston pump for pressure-feeding a viscous fluid such as concrete, sludge, earth and sand, and a method for discharging a viscous fluid remaining in a pressure-feeding pipe.

[0002]

2. Description of the Related Art A conventional concrete pump discharge method for residual concrete will be described with reference to FIGS.
In the state shown in FIG. 3, the viscous fluid in the hopper 16 is sucked into the pressure feeding cylinder 9, and the flow of the sucked and discharged viscous fluid is controlled by switching the gate of the gate housing 21. Pump to. After pumping, Y
The mold tube 17 is opened laterally, and the hopper 16 and the gate housing 2 are opened.
1. The residual viscous fluid in the Y-shaped pipe 17 and the bent pipe 18 is scraped out and discharged, and the sponge 20 is inserted into the transport pipe 18 so that the flange 15 at the tip of the high-pressure rubber hose 14 is joined to the joint 1.
9 is used to connect high pressure water sent from a high pressure water supply device (or high pressure air) (not shown) to the transport pipe 18 and prevent sponge 20 from mixing high pressure water with a viscous fluid. Drain the viscous fluid in the pipe.

[0003]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
There are the following problems. In the concrete pump shown in FIGS. 3 and 4, the gate housing 21 and the Y-shaped pipe 1
Due to the structure using 7, even if a sponge is inserted from the hopper 16 to discharge the residual viscous fluid, the gate housing 2
The sponge stops inside the 1 or Y-shaped tube 17 and does not move into the transport tube 18. Further, even if it moves, there is a lot of leakage due to the structure of the gate valve, but high viscous fluid can be pumped but water cannot be pumped. Therefore, in order to discharge the residual viscous fluid in the pipe, the method as described in the section of the prior art must be performed, which requires time and labor, and a large amount of residual liquid remains in the gate housing 21, the Y-shaped pipe 17, and the bent pipe 18. The fluid must be discharged to a place other than the proper discharge location at the tip of the pipe.

It is an object of the present invention to propose a method for discharging a residual viscous fluid that does not require disassembly of a pipe joint or the like after the completion of the pressure feeding and can easily discharge the viscous fluid remaining in a pipe such as a transportation pipe. It is a thing.

[0005]

In the concrete pump shown in FIGS. 1 and 2, the sponge 20 is inserted into the suction port of the suction stroke side cylinder 9'of the lower gate housing 22 of the hopper 16 after the completion of the viscous fluid pressure feeding. By driving, the sponge 20 is pushed into the S pipe 10 by the piston 8 '. After pushing in the sponge 20, water is put into the hopper 16 to operate the concrete pump.

[0006]

The gate valve is switched by the operation of the concrete pump, the sponge 20 is pushed into the S pipe 10 'by the piston 8 or 8', and further pushed by the water pressure to advance in the S pipe 10 and the transport pipe 18. To do. Therefore, the residual viscous fluid in the transport pipe 18 is discharged from the transport pipe tip 23 in the order of viscous fluid, sponge, and water. The sliding surface of the S pipe is always brought into close contact with the mating sliding surface by the pressing mechanism 12, so that high water pressure can be easily obtained.

[0007]

Embodiments of the present invention will be described with reference to FIGS. In the figure, 8 and 8'is a piston, 9 and 9'is a pressure feed cylinder, 10 is an S pipe, 11 is an S pipe drive cylinder, 12 is an S pipe pressing mechanism, 16 is a hopper, 18 is a transport pipe including a bent pipe, 20 Is a sponge, 22 is a gate housing, and 23 is a tip of a transport tube.

Next, the high-viscosity fluid pressure feeding by this apparatus will be described. The high-viscosity fluid supplied to the hopper 16 is connected to the hopper 16 without being connected to the S pipe 10 which is swung by the S pipe driving cylinder 11.
It is sucked into the cylinder 9'by a piston therein. At this time, the highly viscous fluid that has already been sucked by the piston in the cylinder 9 is sent into the transport pipe 18 that is connected to the S pipe 10. The sliding surface between the S pipe 10 and the cylinders 9 and 9'side is kept in close contact with each other by a pressing mechanism 12 for the S pipe (detailed description thereof is omitted), and leakage from the sliding surface is controlled to be minimum.

After the completion of the pressure feeding, the residual high-viscosity fluid in the hopper is sucked into the cylinder 9 or 9'until the worker almost scrapes it down to feed it. Air is sucked when the balance viscous fluid in the hopper becomes empty, but the mechanism of this gate valve does not have sufficient characteristics as a valve for compressed air and it is difficult to obtain high-pressure compressed air (it is possible at low pressure). ). Therefore, the residual viscous fluid in the cylinders 9, 9'S pipe 10 and the transport pipe 18 is discharged by the following method. The sponge 20 is inserted into the open inlet on the cylinder side of the gate housing 22 at the bottom of the hopper, and is operated to switch the S pipe 10 for pressure feeding, and the sponge 20 is pushed into the S pipe 10 from the cylinder 9'by the piston 8 '. .

Next, when water is supplied to the hopper 16 and the pump is operated as it is, the water in the hopper 16 becomes high-pressure water, which is sequentially fed into the S pipe 10 from the cylinders 9 and 9 ', and the viscous fluid in the transport pipe 18 is supplied. Since the sponge 20 and the water move in this order and the water can be pumped into the viscous fluid without preceding, the viscous fluid can be discharged from the transport pipe tip 23. When it is impossible to discharge water from the tip 23, it is possible to suck the water back into the hopper by reversing the pump.

[0011]

According to the method of discharging the residual viscous fluid according to the present invention, the two parallel pistons / cylinders, the gate housings provided at the intake / discharge ports of both pistons / cylinders, and the gate housings are arranged above the gate housings. In a piston type viscous fluid pressure feeding device, comprising: After the pressure feed of the viscous fluid inside is completed, the elastic filler is inserted into the inlet / outlet opening which is open in the gate housing, and water is put into the hopper to operate the viscous fluid pressure feed device. By discharging the residual viscous fluid in the S pipe and the transportation pipe by hydraulic pressure through the elastic filler, the following effects are obtained.

(1) Since it is not necessary to discharge the highly viscous fluid to the vicinity of the gate valve, it is not necessary to treat the residual viscous fluid after the completion of the pressure feeding. (2) Since it is not necessary to disassemble the pipe joint and the water washing operation is simple, the high viscosity fluid remaining in the pipe can be easily discharged from the pipe tip after the completion of the pressure feeding, and the working time is shortened.
It is easy for the operator to operate.

[Brief description of drawings]

FIG. 1 is a cutaway perspective view showing a main part of a concrete pump embodying the present invention.

FIG. 2 is a perspective view showing the overall arrangement of FIG.

FIG. 3 is a perspective view showing a main part of a conventional concrete pump.

FIG. 4 is a perspective view showing a residual concrete discharging method in the concrete pump of FIG.

[Explanation of symbols]

 8 Piston 8'Piston 9 Concrete Cylinder 9'Concrete Cylinder 10 S Pipe 11 S Pipe Drive Cylinder 12 S Pipe Pressing Mechanism 18 Transport Pipe

Claims (2)

[Claims] 1. Two parallel pistons and cylinders,
A gate housing provided at the intake / exhaust ports of both pistons / cylinders, a hopper arranged above the gate housings, and an S pipe for switching the connection of the gate housings alternately in response to the reciprocating motion of the pistons, In a piston-type viscous fluid pressure-feeding device having a transport pipe connected to the discharge side of an S pipe, after the pressure-feeding of the viscous fluid in the hopper is completed, the suction / discharge port opened in the gate housing is elasticized. The residual viscous fluid in the S pipe and the transport pipe is discharged by hydraulic pressure through the elastic filler by inserting a filler and putting water in the hopper to operate the viscous fluid pressure feeding device. Method of discharging viscous fluid. 2. After the residual viscous fluid and the elastic filler are discharged from the tip of the transport pipe, the elastic filler is inserted again into the tip of the transport pipe, and the viscous fluid pumping device is operated in reverse to remove the elastic filler. The method for discharging the residual viscous fluid according to claim 1, wherein the residual viscous fluid is collected on the hopper side.