JPS61138887A - Washing device in piston type concrete pump - Google Patents

Abstract

PURPOSE:To enable a pump cylinder, selector valve, delivery pipe, etc. to be all easily washed by a low priced device, by supplying pressure water to a circulation path, formed in a rod or a pump piston of a driving cylinder, and moving a washing bowl. CONSTITUTION:A device, arranging a washing bowl 28 in the front of a pump piston 3a and extending a rod 22a simultaneously switching a selector valve (not shown in the drawing), connects a pump cylinder 2a with a delivery pipe (not shown in the drawing). Pressure water is supplied between the pump piston 3a and the washing bowl 28 through a hose 27 and a circulation path 23a provided in a point part of the rod 22a, and the washing bowl 28 is moved to the front by the pressure of water. In this way, the pump cylinder 2a, selector valve and inside of the delivery pie can be all easily washed. While the above described constitution, decreasing a number of part items, enables the device to be low priced.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Field of Application The present invention is characterized in that pump pistons are slidably connected in a pair of parallel pump cylinders, and there is a space 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 other end is communicated with the other end through an openable center box,
The present invention relates to a cleaning device for a piston-type concrete pump, which includes a pair of driving cylinders for individually driving each of the pump pistons.

fb) Prior Art Conventionally, in the piston-type concrete pump described above, when cleaning the inside of the discharge pipe, the discharge pipe is divided into a plurality of sections, and a cleaning ball is slid in each divided section using water pressure. For this reason, the inside of the pump cylinder cannot be cleaned, and even if cleaning was done, a great deal of labor was required.

(C1 Problem to be solved by the invention The present invention has been made in view of the above circumstances, and an object thereof is 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. shall be.

(dJ Means for Solving the Problems) 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 connected to a discharge pipe. A switching valve is provided with a swinging pipe that is always in communication with the pump cylinder and whose other end can be alternately communicated with one end of the pump cylinder, and the other end of each pump cylinder is connected with the other end of the pump cylinder. A piston-type concrete pump comprising a pair of drive cylinders for individually driving each pump piston through an openable center box, the pump piston or a drive supporting the pump piston. A flow passage is provided in the rond of the cylinder, a first opening at one end of the flow passage is opened to the front side of the pump piston, and a second opening at the other end is opened to the rear side of the pump piston. The first opening is provided with a lid that can be opened and closed, and the second opening is connected to a hose so that the cleaning ball placed in front of the pump piston can be moved by the fluid supplied from the flow path. The present invention relates to a cleaning device for a piston-type concrete pump characterized by:

(Q) Embodiment An embodiment of the present invention will be described below with reference to the drawings. First, in FIGS. 1 and 2, a piston type concrete pump 1 has a pair of parallel pump cylinders 2a,
Pump pistons 3a and 3b are slid into each of the pump cylinders 2b, and between one end of each pump cylinder 2a and 2b and the hopper 4 and discharge pipe 5, one end of each pump cylinder 2a and 2b is communicated with the hopper 4. A switching valve 6 is installed at the other end of each pump cylinder 2a, 2b to connect the other end of each pump cylinder 2a, 2b to a state where the other end of the pump cylinder 2a, 2b is in communication with the discharge pipe 5. Through a possible center box 7, each pump piston 3a
, 3b individually.
a and 8b are arranged in series.

The hopper 4 is commonly disposed in both pump cylinders 2a, 2b, and one ends of both the pump cylinders 2a, 2b are 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 is comprised of a swing tube 11 that is swingably accommodated in the lower part of the flap 4, and a hydraulic cylinder 12 for swinging the swing tube 11.

The swing tube 11 is provided in the lower part of the hopper 4 and extends between both side walls 9 and 10, and is curved corresponding to the bottom 13 of the hopper 4. One end of the 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 connected to the pump cylinders 2a, 2b.
They are brought into sliding contact with the inner surface of the side wall 9 of the hopper 4 so as to alternately communicate with one end of the hopper.

A drive shaft 14 whose axis is the same as the extension of the axis of the discharge tube 5 is integrally provided at the upper part of the other end of the swing tube 11.
This drive shaft 14 is rotatably supported by the side wall 9 of the hopper 4 and projects outward from the hopper 4. The hydraulic cylinder 12 is supported on the hopper 4 by a Talebis 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 inside of the discharge pipe 5 via the swing pipe 11, the other pump cylinder 2b is communicated with the inside of the hopper 4,
Further, in a state where the other pump cylinder 2b is communicated with the discharge pipe 5 via the swing pipe 11, one pump cylinder 2a
communicates with the inside of the hopper 4.

The center box 7 is a rectangular box-like body 18 with an open top.
and M19 that covers the upper part of the box-like body 18 in an openable and closable manner, and each pump cylinder 2a2b is connected to one side wall 20 of the box-like body 18 in parallel. Therefore, the other ends of both pump cylinders 2a, 2b communicate with each other via the center box 7.

In the box-shaped body 18, the other side wall 21 opposite to the one side wall 20 has drive cylinders 8a, 8b whose axes coincide with the extension lines of the axes of the respective pump cylinders 2a, 2b.
are connected to each other. The rods 22a, 22b of each driving cylinder 8a, 8b are inserted into the pump cylinders 2a, 2b from the center box 7, and these rods 22a, 22b are inserted into the pump cylinders 2a, 2b from the center box 7.
Pump pistons 3a3b are fixed to the ends of 2a and 22b, respectively. Therefore, the driving cylinders 8a, 8b
By telescopically operating the pump pistons 3a, 3
b slides inside the pump cylinders 2a, 2b, and a pumping action is performed.

23a, 23b are flow passages provided at the tips of the rods 22a, 22b, and the flow passages 23a, 23b have first openings 24a, 24b at one end connected to the pump piston 3a,
3b, and the second opening 25a is the other end.
, 25b are opened on the rear side of the pump pistons 3a, 3b.

Furthermore, lids 26 are attached to both openings 24a, 24b, 25a, and 25b, respectively.
By removing 6..., each opening 24a...
...It can be opened and closed.

Furthermore, a hose 27 can be connected to the second openings 25a and 25b, and as shown in FIG. The pressure water is used to move the cleaning balls 28 placed in front of the pump pistons 3a, 3b.

The cleaning ball 28 is movable in elastic sliding contact with the inner surfaces of the pump cylinder 2a12b, 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.

In the embodiment, the flow passage is formed in the rod, but the same effect can be obtained even if it is formed in a part of the pump piston.

Next, the operation of this embodiment will be explained with reference to FIGS.
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, the pump cylinder 2a
is communicated with the inside of the hopper 4, so if any fresh concrete remains in the hopper 4, the remaining fresh concrete will be introduced into the pump cylinder 2a.

Next, as shown in FIG. 3 (bl), the first opening 24a and the second opening 25a are opened in the open center box 7.
Remove the lids 26 and 26, and connect the hose 27 to the second opening 25a as shown in Figure 3 (C1).

In this state, as shown in FIG. 3(d), the cleaning ball 28 is placed in front of the pump piston 3a, and the rod 22a is
is extended, and at the same time, the switching valve 6 is switched to connect the pump cylinder 2a to the discharge pipe 5.

Stop the pump piston 3a at the position shown in FIG. 3(e),
After that, pressurized water is supplied between the pump piston 3a and the cleaning ball 28 through the hose 27 and the flow path 23a, and the cleaning ball 28 moves forward due to the pressure.
The inside of the switching valve 6 and the discharge pipe 5 can be cleaned.

At this time, since the connecting portion between the pump cylinder 2a and the switching valve 6 is sealed by the pump piston 3a, water will not leak.

+f) Effects of the Invention As described above, the present invention forms a flow passage in the drive cylinder rond or pump piston, and moves the cleaning ball by supplying pressure water to the flow passage, so that the pump cylinder, The switching valve and the discharge pipe can all be easily cleaned, and the number of parts is small, making it inexpensive.

[Brief explanation of drawings]

Figure 1 is a plan view, Figure 2 is a sectional view taken along line A-A, Figure 3 (al
-fe) are cross-sectional views showing the working procedure during cleaning. 2a, 2b are pump cylinders, 3a, 3b are pump pistons, 22a, 22b are rods, 23a, 23b are flow passages, 24a, 24b are first openings, 25a, 25b are second openings, 26 is a lid 27 Hose, 28 is a cleaning ball. Applicant Kyokuto Kaihatsu Kogyo Co., Ltd. No. 312 (d) r (e)

Claims (1)

[Claims] Pump pistons are respectively slid into 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 one end of the pump cylinder. A switching valve is provided with a swinging pipe that can alternately communicate with the pump cylinder, and the other end of each pump cylinder is connected to the other end of the pump cylinder.
Moreover, in a piston-type concrete pump comprising a pair of driving cylinders for individually driving each of the pump pistons connected via an openable center box, the driving cylinder for supporting the pump piston or the pump piston. A flow path is provided in the rod, a first opening at one end of the flow path is opened to the front side of the pump piston, a second opening at the other end side is opened to the rear side of the pump piston, and the first opening at one end of the flow path is opened to the front side of the pump piston. The opening is provided with a lid that can be opened and closed, and a hose can be connected to the second opening, so that the cleaning ball placed in front of the pump piston can be moved by the fluid supplied from the flow path. A cleaning device for piston type concrete pumps.