JPS6131189Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a switching valve device for a concrete pump that sucks and discharges concrete using two concrete cylinders.

Conventionally, concrete pumps in which two concrete cylinders are connected to a concrete hopper and the suction and discharge are switched without using a slide valve between the concrete hopper and the concrete cylinder are shown in Figures 1 and 2. There is a configuration as shown in the figure below.

That is, two suction and discharge ports b are arranged side by side on the lower front surface of the concrete hopper a, a concrete cylinder c is connected to each of the suction and discharge ports b, and a discharge pipe d is bent in the vertical direction inside the concrete hopper a. The opening at the lower end of the discharge pipe d is connected to two concrete cylinders e.
The lower end of the discharge pipe d is made to be able to swing from side to side so that the lower end of the discharge pipe d is brought to the top of the hopper a, and the swing cylinder g is used to connect the discharge pipe to the hopper a. d is made to swing, and there is also a configuration in which a thrust receiving portion e of the discharge pipe d is provided at a lower position within the hopper a to receive the thrust during concrete discharge.

f is a stirring blade.

However, in the above-mentioned conventional type, (a) the opening on the inlet side of the discharge pipe d moves in an arc due to the swing of the discharge pipe, so if you try to connect a swinging cylinder etc. to the inlet side of the discharge pipe d; , it is necessary to provide a gap for swinging in the concrete hopper a due to the circular arc movement.

(b) It is necessary to support the thrust receiving part e with the hopper a.

The structure is as follows.

The present invention allows the inlet side to move linearly even when the discharge pipe is swung around the outlet side as a fulcrum.
In addition, it is intended to avoid providing a separate thrust receiving part, and a concrete cylinder is installed in a concrete hopper with two suction and discharge ports opened in the front so that each concrete cylinder communicates with the suction and discharge ports. A switching valve that can be switched to communicate with one of the concrete cylinders is held in a guide on the inner surface of the concrete hopper so that it can move freely in the horizontal direction, and the lower end of the discharge pipe is made to be able to expand and contract in the middle.
It is characterized in that it is rotatably connected to the switching valve.

Embodiments of the present invention will be described below based on the drawings.

As shown in FIGS. 3 to 5, a concrete hopper 1 has two concrete cylinders 2, 3 installed horizontally in front of it, and a suction/discharge port 4 communicating with both the concrete cylinders 2, 3.
Two cylindrical switching valves 5 are arranged in the hopper 1 to be alternately connected to the two suction and discharge ports 4. The switching valve 5 has a flange 6 at one end and a taper 7 at the other end, and a guide 8 horizontally attached to the front inner wall of the concrete hopper 1.
The taper 7 of the switching valve 5 is engaged with the valve cylinder 9 provided on one side of the concrete hopper 1 to cause the switching valve 5 to linearly move in the horizontal direction. One end of a bent discharge pipe section 10 having a flange at one end is connected to the switching valve 5 through a rotary joint 11, and the concrete hopper 1
One end of a bent discharge pipe part 13 having a flange at one end and enlarged to a large diameter at the other end is connected to the discharge pipe part 12 fixedly inserted into the upper part of the pipe part 12 by a rotary joint 14. The end and the other end of the bent discharge pipe part 13 are fitted together to form the discharge pipe parts 10, 13, 1.
When the discharge pipe consisting of 2 swings about the rotary joint 14 as a fulcrum, the fitting part 15 expands and contracts so that the discharge pipe 10 can move linearly together with the switching valve 5.

16 is a stirring blade.

With the above configuration, when one concrete cylinder 3 sucks concrete in the hopper 1 and the other concrete cylinder 2 discharges concrete, the valve cylinder 9 is operated to communicate the switching valve 5 with the concrete cylinder. Switch as follows. At this time, the switching valve 5 has a discharge pipe section 10.
are rotatably connected by a rotary joint 11, and the discharge pipe part 13 is connected to a fixed discharge pipe part 12 by a rotary joint 14.
Since they are rotatably connected, the discharge pipe also swings about the rotary joint 14 at the same time as the switching valve 5 moves. The discharge pipe parts 13 and 10 are the fitting part 1
5, it can expand and contract in the vertical direction, so even when the discharge pipe swings, the lower discharge pipe section 10 does not move in an arc, but moves in a straight line.

Next, after the switching valve 5 is made to correspond to the concrete cylinder 2, when the concrete cylinder 2 is operated in the extrusion direction, the concrete sucked into the concrete cylinder 2 is transferred to the switching valve 5, the discharge pipe portions 10, 13, 12 and then discharged to the work place. When discharging this concrete, the discharge pipe section 10
However, in the present invention, the taper 7 of the switching valve 5 is embraced by the guide 8, so the guide 8 can receive the thrust, and the discharge pipe can be prevented from being pushed by the thrust. can.

It should be noted that the present invention is not limited to the above-mentioned embodiments. For example, the rotary joint 14 is connected to the hopper 1.
The upper discharge pipe section 13 can be extended to the outside of the hopper 1. In this case, since the discharge pipe section 13 only rotates, there is no need to provide a clearance in the hopper 1 for swinging. Further, although the case where the valve switching is performed by the valve cylinder 9 at the lower part of the hopper 1 is shown, a drive mechanism may be provided in the discharge pipe section outside the hopper 1 to swing it in the upper position.

As described above, according to the device of the present invention, (i) the discharge pipe in the concrete hopper is made expandable and retractable midway, and the switching valve connected to the discharge pipe is held by a guide so that it can be moved horizontally; Therefore, even if the discharge pipe swings, the switching valve can perform horizontal linear movement, and a simple valve switching device can be used.

(ii) Since the switching valve is held by a guide, the thrust force during concrete discharge can be received by the hopper via the guide, making it unnecessary to provide a large thrust receiving section as in the past.

It can produce excellent effects such as

[Brief explanation of drawings]

Figure 1 is a cutaway side view showing an example of a conventional example;
The figure is a view taken in the direction of the arrow shown in FIG. 1, FIG. 3 is a cutaway side view showing an example of the device of the present invention, FIG. It is a directional view. 1... Concrete hopper, 2, 3... Concrete cylinder, 5... Switching valve, 7... Taper, 8... Guide, 9... Valve cylinder, 10, 1
2, 13...Discharge pipe section, 11, 14...Rotary joint.

Claims (1)

[Scope of utility model registration request] A concrete cylinder is installed in a concrete hopper having two suction and discharge ports opened in the front so that each concrete cylinder communicates with the suction and discharge ports, and a switching valve that can be switched to communicate with either of the concrete cylinders is installed in the concrete hopper. A concrete pump switching valve device, characterized in that the lower end of a discharge pipe, which is held movably in the horizontal direction by an inner surface guide and is extendable and retractable along the way, is rotatably connected to the switching valve.