JPH0625563U - Swing valve type viscous fluid pump valve ring - Google Patents

Abstract

(57) [Summary] [Purpose] To improve wear resistance of the valve ring and extend its service life. [Structure] A cemented carbide plate 13 is provided on a sliding surface of a tip of the oscillating tube 6 with a valve plate 8 of a valve ring body 7a.
Are brazed and integrated to form a valve ring 7. Plate 13 made of cemented carbide for all sliding surfaces with valve plate 8
Therefore, the wear resistance of the surface of the valve ring body 7a is improved, and the life can be extended.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a valve ring of a viscous fluid pump that pumps a viscous fluid such as concrete.

[0002]

[Prior art]

 There are two types of intake and discharge valves for viscous fluid pumps: the swing valve type and the slide valve type.

As shown in FIG. 3, the former oscillating valve type has two suction and discharge ports 2 outside the viscous fluid hopper 1 provided with two suction and discharge ports 2 arranged side by side on the lower front surface. Corresponding to the above, two fluid cylinders 3 are installed horizontally, and the fluid piston 4 housed in the fluid cylinder 3 is integrated with the hydraulic piston of the hydraulic cylinder of the main hydraulic cylinder (not shown) via the rod 5. And the two main hydraulic cylinders are alternately moved forward and backward, so that the fluid pistons 4 can be alternately moved back and forth in the two fluid cylinders 3. On the other hand, an S-shaped rocking tube 6 is housed in the hopper 1, and a valve ring 7 is attached to one end of the rocking tube 6 so that the valve ring 7 can connect the two suction / discharge ports 2 to each other. The valve plate 8 mounted inside is contacted so that it can be swung in the left-right direction, and the other end of the rocking tube 6 is connected to the pressure feeding tube 9 by penetrating the back side of the hopper 1. A rocking cylinder (not shown) is connected to a connecting shaft 10 fixed in the middle of the rocking pipe 6 via an operating lever 11 so that the reciprocating motion of the fluid piston 4 and the rocking of the rocking pipe 6 are associated with each other. The viscous fluid in the hopper 1 sucked into the fluid cylinder 3 is pumped through the oscillating tube 6.

In the above-mentioned swing valve type intake / discharge valve, the fluid is generated by the close contact of the sealing surface composed of the valve ring 7 attached to one end of the swing pipe 6 and the valve plate 8 of the intake / discharge port 2 of the hopper 1. A seal is provided at the time of pressure feeding, that is, when the fluid in the fluid cylinder 3 is discharged through the oscillating pipe 6, but the sealing surfaces of the valve ring 7 and the valve plate 8 slide and wear. Come on. If a clearance is formed between the valve ring 7 and the valve plate 8 due to wear, viscous fluid may enter between them, and if viscous fluid flows out from this clearance, sealing cannot be performed. Moreover, it falls into malfunction.

In order to prevent such a situation, conventionally, a material having high wear resistance such as high chrome cast iron is used for the valve ring 7, or a sliding surface of the valve ring 7 is used as shown in FIG. Most of them tried to improve the wear resistance of the sliding surface by forming a step between the inner peripheral portion and the outer peripheral portion of the cemented carbide ring 12 by shrink fitting or cold fitting.

[0006]

[Problems to be solved by the device]

 However, in the case of the above-mentioned conventional valve ring whose sliding surface is made of high chromium cast iron, the high chromium cast iron on the sliding surface is likely to wear quickly when casting low slump concrete at high places, so the valve plate is more likely to wear than the valve plate. The life of the ring is relatively short, and as shown in FIG. 4 (a), the cemented carbide ring 12 is shrink-fitted or cold-fitted by forming a step between the inner peripheral portion and the outer peripheral portion of the valve ring 7. In the case of a valve ring, as shown in Fig. 4 (b), the surface of the valve ring 7 side sandwiched between the inner and outer carbide rings 12 slides against the valve plate 8 and wears quickly due to the difference in material hardness. It was found that the tightening force of the carbide ring 12 was reduced and the carbide ring 12 was disengaged from the valve ring 7.

Therefore, the present invention intends to provide a valve ring capable of improving the wear resistance of the sliding surface at one end of the oscillating tube and maintaining the sealing property with the valve plate 8 continuously. .

[0008]

[Means for Solving the Problems]

 SUMMARY OF THE INVENTION In order to solve the above problems, the present invention allows a swinging tube housed in a hopper to swing freely by swinging an operating lever outside the hopper and swinging the swinging tube. When the two fluid pressure feeding cylinders are switched to the suction side and the discharge side, the rocking valve is attached to the tip of the rocking pipe and slides on the valve plate surface on the hopper side when rocking. In the valve ring of the viscous fluid type pump, a cemented carbide plate is entirely brazed and integrated on the surface of the valve ring body attached to the tip of the shaking tube.

[0009]

[Action]

 Since a cemented carbide plate is brazed to the sliding surface of the valve ring body, the sliding surface of the valve ring is less likely to wear even when it slides on the valve plate, resulting in a longer service life.

[0010]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show an embodiment of the present invention. As in the case shown in FIG. 3, a valve ring 7 is fitted to one end (tip) of a rocking tube 6 housed in the hopper 1. The rocking pipe is attached to the valve plate 8 fixed to the hopper 1 so that the valve plate 8 is rocked in the left-right direction, and the other end of the rocking pipe 6 is passed through the hopper 1 and connected to the pressure feeding pipe 9. By swinging one end side of the swinging pipe 6 to the left and right through the connecting shaft 10 fixed to 6, one of the two suction and discharge ports 2 of the hopper 1 is alternately brought into communication with the fluid cylinder 3. In such a structure, the valve ring 7 is composed of a valve ring body 7a and a cemented carbide plate 13 brazed to the surface thereof.

That is, the valve ring body 7a is manufactured to be slightly thinner than the conventional valve ring, and a ring-shaped cemented carbide plate 13 having a required thickness is brazed and fixed to the surface thereof.

In the operation of the oscillating valve type viscous fluid pump, when the oscillating tube 6 is oscillated left and right in the hopper 1, the valve ring 7 at the tip of the oscillating tube 6 rubs against the surface of the valve plate 8. However, in the valve ring of the present invention, since the cemented carbide plate 13 is brazed over the entire sliding surface of the valve ring body 7a, the hardness difference as in the conventional example shown in FIG. Therefore, the situation where the side of the valve ring 7 as the base material is abraded is eliminated, and the plate 13 of cemented carbide does not drop off from the valve ring body 7a. Further, since the surface of the valve ring 7 in contact with the valve plate 8 is the plate 13 of cemented carbide, the life of the valve ring 7 can be extended, and a gap is formed on the sliding surface between the valve ring 7 and the valve plate 8. It is possible to prevent such a situation for a long time.

It should be noted that the present invention is not limited to the above-mentioned embodiment, and the ring-shaped cemented carbide plate may be divided for manufacturing, and within the scope not departing from the gist of the present invention. Of course, various changes can be made.

[0015]

[Effect of device]

 As described above, according to the valve ring of the oscillating valve type viscous fluid pump of the present invention, it is attached to the tip of the oscillating tube which is put in the hopper and oscillates left and right, and the inside of the hopper is moved left and right. In a valve ring that slides with the valve plate on the hopper side when rocking, a cemented carbide plate is brazed over the entire surface of the valve ring body attached to the tip of the rocking tube to make it integral. As compared to a structure in which a cemented carbide ring is partially fitted, uneven wear due to the difference in hardness of the sliding surface material and the resulting tightening from the valve ring body There is no problem of dropout due to a decrease in force, the wear resistance of the sliding surface is improved, and the life of the valve plate can be extended, which is an excellent effect.

[Brief description of drawings]

FIG. 1 is a side view showing an outline of an embodiment of a valve ring of an oscillating valve type viscous fluid pump of the present invention.

FIG. 2 is an enlarged view of part A of FIG.

FIG. 3 is a cut side view showing an example of a conventional rocking valve type viscous fluid pump.

FIG. 4 shows an example of a conventional valve ring,
(A) is a cross-sectional view before wear, and (B) is a cross-sectional view after wear.

[Explanation of symbols]

 1 Hopper 3 Fluid Cylinder 6 Oscillating Tube 7 Valve Ring 7a Valve Ring Main Body 11 Operation Lever 13 Cemented Carbide Plate

Claims (1)

[Scope of utility model registration request] 1. A rocking tube housed in a hopper so as to be rockable is rocked by rotating an operating lever outside the hopper, and the rocking tube is rocked to feed two fluids. A valve ring for a rocking valve type viscous fluid pump, which is attached to the tip of the rocking pipe so as to slide on the valve plate surface on the hopper side when rocking when switching the cylinder between the suction side and the discharge side. 2. A valve ring for an oscillating valve type viscous fluid pump, characterized in that a cemented carbide plate is brazed over the entire surface of the valve ring main body attached to the tip of the oscillating tube and integrated.