JPH06221261A - Device for tightly contacting sliding surface of s-type gate valve of force-feed pump - Google Patents

Abstract

PURPOSE:To enable the tight contact with each other of both of a sliding plate, which is installed at the end of a pump cylinder, and a sliding ring, which is installed at the end of an S-pipe, even in the case where the contact surfaces thereof are not in parallel with each other. CONSTITUTION:A sliding ring 9, which is installed at the end of an S-pipe 3, is brought into sliding contact with a sliding plate 8, which is installed at the ends of pump cylinders 5, 5'. The installation part of the sliding ring 9 to be installed at the end of the S-pipe 3 is formed into a spherical surface 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an S-type gate valve sliding surface contacting device for a concrete pump, a mortar pump, a sewage treatment plant dewatering cake pump, a sludge pump, a sediment pump, an oil sludge and other pumps.

[0002]

2. Description of the Related Art For example, in the concrete pump shown in FIG. 3, the concrete supplied to a hopper 1 has a casing 4 in response to a movement of an S pipe 3 in a gate housing 2.
Through the suction port opened to the hopper 1 side inside, two piston pumps 5, 5 for pumping concrete,
The concrete sucked by 6 and the sucked concrete are moved by pistons 6, 6 to a slide plate 8 attached to the ends of pump cylinders 5 and 5, and a slide ring 9 attached to the end of S pipe 3.
It is sealed by sliding contact with S, is sent to the S pipe 3 while minimizing leakage into the gate housing 2, and is pressure-fed to a predetermined position via a transport pipe (not shown) and S
The pipe 3 is swung by a drive device 11 via a drive liner 10 to switch the flow of concrete, and the S pipe 3 is fixed to the gate housing 2 via bearings 12 and 13 via the drive liner 10.

[0003]

In the concrete pump described above, the S pipe 3 which is alternately connected with the two pump cylinders 5 and 5 for pumping concrete is mechanically equipped with a swing center and a slide ring 9. The moving end cannot be established without eccentricity of the minimum radius R. Therefore, during pumping, the S pipe 3 receives the force F due to the pumping pressure P at both ends of the S pipe 3. (Strictly speaking, the pressure at the inlet and outlet of the S pipe is low on the outlet side by the amount of pressure loss, but since the S pipe is short, it is practically negligible.) Moment M = F × due to the eccentricity R of the S pipe 3 R acts on S pipe 3 and liner 1
S pipe 3 supported by bearings 12 and 13 via 0
Will bend at an angle of α with respect to the central axis of swing. This bending angle α cannot be ignored when the pumping pressure becomes high, and a gap is created between the sliding plate 8 and the sliding ring 9, and since the sliding ring 9 is attached to the S pipe 3 by a spigot, the pressing mechanism 14 Even if it is pressed with, it cannot be solved, and the paste content in the concrete leaks, causing a problem during pumping.

The present invention was developed in order to deal with such a problem, and it is possible to reduce the S
The purpose is to bring the sliding plate 8 and the sliding ring 9 into close contact with each other even when the contact surfaces of the sliding plate 8 and the sliding ring 9 are no longer parallel due to bending of the pipe or the like.

[0005]

The structure of the present invention for achieving the above object will be described with reference to FIGS. 1 and 2 corresponding to the embodiments. The present invention is mounted on the end portions of pump cylinders 5, 5. In an S-shaped gate valve sliding surface contacting device of a pressure pump in which a sliding ring 9 mounted on the end of the S pipe 3 is slidably contacted to the sliding plate 8 mounted on the end of the S pipe 3. The mounting portion of the sliding ring 9 is formed on the spherical surface 15.

[0006]

According to the present invention, the sliding ring attached to the end portion of the S pipe through the spherical surface by the above means can be tilted in any direction with respect to the S pipe, and the pressing mechanism of the sliding ring can be used. Since the S pipe is pressed against the sliding plate attached to the end and the S pipe bends due to the pumping pressure and the end face of the S pipe inclines with respect to the sliding plate by an angle α, the sliding ring is always in close contact with the sliding plate. It is possible to minimize the leakage of the cement-based component of concrete during pumping.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. In the drawings, reference numerals 1 to 14 denote the same parts as those of the conventional example shown in FIG. To do. In the present invention, as shown in FIG. 2, the mounting surface of the sliding ring 9 on the S pipe 3 is the center line 3a of the S pipe 3.
A spherical surface 15 having a radius B centered on the point A above is used.

Thus, even if the S pipe 3 is tilted by an angle α due to the pumping pressure, there is flexibility between the sliding ring 9 and the S pipe 3, and the head can be swung if within a certain angle. S
Since the pipe 3 is pressed against the sliding plate 8 with the optimum force by the pressing mechanism 14, the sliding ring 9 can be in close contact with the sliding plate 8 and the leakage can be kept to a minimum.

[0009]

As described above, according to the present invention, since the mounting portion of the sliding ring mounted on the end portion of the S pipe is formed into a spherical surface, the sliding ring can be arbitrarily attached to the S pipe through the spherical surface. Since it can be tilted in the direction of, the gap of the sliding surface caused by the bending of the S pipe due to the pressure-feeding pressure can be kept to a minimum regardless of the pressure-feeding pressure to minimize the leakage of cement paste and improve the pressure-feeding performance. Since the moving plate and the sliding ring do not wear unevenly, the durability of the moving plate and the sliding ring can be improved.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is an enlarged view of a C portion of FIG.

FIG. 3 is a cross-sectional view showing a conventional example.

[Explanation of symbols]

 3 S pipe 5 Pump cylinder 8 Sliding plate 9 Sliding ring 15 Spherical surface

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Take ▲ Zaki ▼ Toshio Shimonoseki, Yamaguchi Prefecture 2-16-1, Higashiyamato-cho Shimo-Seki Ryoju Engineering Co., Ltd.

Claims (1)

[Claims] 1. An S-shaped gate valve sliding surface contact device for a pressure pump, wherein a sliding plate mounted on the end of a pump cylinder is in sliding contact with a sliding ring mounted on the end of an S pipe. An S-shaped gate valve sliding surface contact device for a pressure pump, wherein a mounting portion of the sliding ring mounted on an end portion of the S pipe is formed into a spherical surface.