JPH0123671B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention comprises a pair of parallel pump cylinders in which pump pistons are slidably connected to each other, and between one end of each pump cylinder and a hopper and a discharge pipe. , a switching valve equipped with a swinging pipe whose one end is always in communication with the discharge pipe and whose other end can be alternately communicated with one end of the pump cylinder is installed, and the other end of each pump cylinder is provided with The present invention relates to a cleaning device for a piston-type concrete pump, which comprises a pair of driving cylinders for individually driving each of the pump pistons, the other end of which communicates with each other via an openable center box.

(b) Conventional technology Conventionally, in the piston-type concrete pump described above, when cleaning the inside of the discharge pipe, the discharge pipe was divided into multiple sections, and a cleaning ball was slid in each divided section using water pressure. ing. For this reason, the inside of the pump cylinder cannot be cleaned, and even if cleaning could be done, a great deal of labor would be required.

(c) Problems to be Solved by the Invention The present invention has been made in view of the above circumstances, and aims to provide a cleaning device that can clean the inside of a piston-type concrete pump and the inside of a discharge pipe at the same time. purpose.

(d) Means for solving the problem In the present invention, pump pistons are slidably connected in a pair of parallel pump cylinders, and between one end of each pump cylinder and a hopper and a discharge pipe, one end is a discharge pipe. A switching valve having a swinging pipe that is always in communication with the pipe and whose other end can alternately communicate with one end of the pump cylinder is interposed, and the other end of each pump cylinder is connected to the other end of the pump cylinder. A piston-type concrete pump comprising a pair of drive cylinders for individually driving each of the pump pistons, which are connected to each other via a center box that communicates with each other and that can be opened, the pump pistons being connected to the rods of the drive cylinders. The rod from which the pump piston has been removed can be connected to a cleaning member having a receiving portion in front via the coupling ring, a cleaning ball is attached to the receiving portion, and the cleaning member is attached to the rod from which the pump piston is removed. The present invention relates to a cleaning device for a piston-type concrete pump, which has a hose connected to the backside of a cleaning ball to supply fluid.

(e) Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings. First, in FIGS. 1 and 2, a piston type concrete pump 1 has a pump piston 3 in a pair of parallel pump cylinders 2a and 2b.
a, 3b are slid together, and between one end of each pump cylinder 2a, 2b and the hopper 4 and discharge pipe 5, there is a state in which one end of each pump cylinder 2a, 2b is communicated with the hopper 4, and a state in which the discharge pipe 5 is connected. A switching valve 6 is installed at the other end of each pump cylinder 2a, 2b to communicate the other ends of the pump cylinders 2a, 2b, and a center box 7 that can be opened. A pair of driving cylinders 8a, 8b for individually driving each of the pump pistons 3a, 3b are arranged in series via a pair of driving cylinders 8a, 8b.

The hopper 4 is commonly disposed in both pump cylinders 2a, 2b, and is provided in both pump cylinders 2a, 2b.
One end of b is connected in parallel to the lower side wall 9 of the hopper 4. Further, a single discharge pipe 5 is connected to the side wall 10 of the hopper 4 on the opposite side from both pump cylinders 2a, 2b.

The switching valve 6 includes a swing tube 11 that is swingably accommodated in the lower part of the hopper 4 and a hydraulic cylinder 12 for swinging the swing tube 11. The swing tube 11 is provided at the lower part of the hopper 4 between both side walls 9 and 10, and is located at the bottom 13 of the hopper 4.
It is curved accordingly. One end of this swing tube 11 is swingably supported on the side wall 10 of the hopper 4 so as to be in constant communication with the discharge pipe 5, and the other end of the swing tube 11 is alternately connected to one end of the pump cylinders 2a and 2b. In this way, it comes into sliding contact with the inner surface of the side wall 9 of the hopper 4.

A drive shaft 14 whose axis is the same as the extension of the axis of the discharge pipe 5 is integrally provided at the upper part of the other end of the swing tube 11, and this drive shaft 14 is rotatable on the side wall 9 of the hopper 4. The hopper 4 is supported by the hopper 4 and protrudes outward from the hopper 4. The hydraulic cylinder 12 is supported on the hopper 4 by a clevis pin 15. Further, a swinging arm 16 is fitted to the end of the drive shaft 14 so as to prevent mutual relative rotation, and a piston rod 17 of the hydraulic cylinder 12 is connected to the swinging arm 16. Therefore, by telescopically operating the hydraulic cylinder 12, the drive shaft 14 reciprocates and the swing tube 11 swings.

According to such a switching valve 6, when one pump cylinder 2a is communicated with the discharge pipe 5 via the swing pipe 11, the other pump cylinder 2b is communicated with the inside of the hopper 4, and the swing While the other pump cylinder 2b is in communication with the discharge pipe 5 via the pipe 11, one pump cylinder 2a is in communication with the inside of the hopper 4.

The center box 7 consists of a rectangular box-like body 18 with an open top and a lid 19 that covers the top of the box-like body 18 so as to be openable and closable.
b are connected in parallel to one side wall 20 of the box-like body 18. Therefore, both pump cylinders 2a, 2
The other ends of b communicate with each other via a center box 7.

In the box-shaped body 18, each pump cylinder 2 is provided on the other side wall 21 opposite to the one side wall 20.
Driving cylinders 8a and 8b are respectively connected with their axes aligned with the extension lines of axes a and 2b. Rods 22a, 22 of each driving cylinder 8a, 8b
b is from center box 7 to pump cylinder 2
a, 2b, these rods 22a,
The auxiliary rod 2 on the pump piston 3a, 3b side is connected to the end of the pump piston 22b via couplings 23a, 23b.
4a and 24b are each fixed. Therefore, by telescopically operating the drive cylinders 8a, 8b, the pump pistons 3a, 3b slide within the pump cylinders 2a, 2b, and a pump action is performed.

In order to clean the piston type concrete pump 1, a cleaning device 25 as shown in FIG. 3c is prepared.

This cleaning device 25 has a cleaning ball 26 and a receiving part 27 for accommodating the cleaning ball 26 at the front, and rods 22a of driving cylinders 8a and 8b at the rear.
The cleaning member 30 includes a connecting portion 28 for connecting to the receiving portion 22b and a flow path 29 that communicates the front and rear of the receiving portion 27, and a hose 31 connected to the flow path 29.

The cleaning ball 26 is attached to the pump cylinders 2a, 2
b. It is movable in elastic sliding contact with the inner surfaces of the swing tube 11 and the discharge tube 5, and is made of, for example, a sponge that does not allow fluid to pass therethrough.

The receiving portion 27 of the cleaning member 30 seals the pump cylinders 2a, 2b with its outer periphery, and the receiving portion 27
The fluid supplied to the front does not leak to the rear of the receiving portion 27.

Next, the operation of this embodiment will be explained with reference to FIGS. 3a to 3e. When cleaning after the completion of concrete pouring work, first, as shown in FIG. 3a, one pump cylinder, for example, 2a is communicated with the inside of the hopper 4 through the switching valve 6, the lid 19 of the center box 7 is opened, and the pump piston 3a is further pulled out into the center box 7. At this time, since the pump cylinder 2a is communicated with the inside of the hopper 4, if any fresh concrete remains in the hopper 4, the residual fresh concrete is introduced into the pump cylinder 2a.

Next, as shown in FIG. 3b, the coupling 23a is removed from the open center box 7 and the pump piston 3a is removed.

After that, as shown in FIG. 3c, the cleaning ball 2
6 and the cleaning member 30 to which the hose 31 is attached are connected to the rod 22a with the coupling 23a. After this is completed, the rod 22a is extended to move the cleaning member 30 forward as shown in FIG. is switched to communicate with the pump cylinder 2a.

In this state, when water is supplied from the hose 31,
As shown in FIG. 3e, water is supplied between the receiving portion 27 and the cleaning ball 26 through the flow path 29,
The pressure causes the cleaning ball 26 to move forward, thereby cleaning the inside of the switching valve 6 and the discharge pipe 5.

At this time, since the connecting portion between the pump cylinder 2a and the switching valve 6 is sealed by the receiving portion 27, water will not leak.

(f) Effects of the Invention As described above, the present invention enables a cleaning member to be attached to and removed from the rod of a driving cylinder, a cleaning ball and a hose are attached to the cleaning member, and the cleaning ball is moved by the rod and fluid pressure. As a result, the pump cylinder switching valve and the discharge pipe can all be easily cleaned, and the number of parts is small, resulting in an inexpensive product.

In addition, the pump piston can be attached and detached from the drive cylinder rod via a coupling ring, so when replacing the pump piston gasket, etc., the coupling is removed and the pump piston is taken out to be replaced. Since it is easy to install and remove, parts such as gaskets can be easily replaced.

[Brief explanation of drawings]

Fig. 1 is a plan view, Fig. 2 is a sectional view taken along A-A, Fig. 3
Figures a to e are sectional views showing the working procedure during cleaning, 2a and 2b are pump cylinders, 3a and 3b are pump pistons, 22a and 22b are rods, 25 is a cleaning device, 26 is a cleaning ball, 30 is a cleaning member,
31 is a hose.

Claims (1)

[Claims] 1. Pump pistons are slid together in a pair of parallel pump cylinders, and between one end of each pump cylinder and a hopper and a discharge pipe, one end is always in communication with the discharge pipe, and the other end is connected to the pump cylinder. A switching valve equipped with a swinging pipe that can communicate alternately is installed at one end, and at the other end of each pump cylinder,
A piston-type concrete pump comprising a pair of driving cylinders connected to each other for individually driving the pump pistons through an openable center box that communicates the other ends of the pump cylinders. The piston can be attached and detached from the rod of the driving cylinder via a coupling ring, and a cleaning member having a receiving portion in front can be connected via the coupling to the rod from which the pump piston is removed, and a cleaning ball is attached to the receiving portion. A cleaning device for a piston-type concrete pump, which is equipped with a cleaning member, and a hose capable of supplying fluid to the back surface of a cleaning ball is connected to the cleaning member.