JPH0625562U - Swing valve type viscous fluid pump valve plate - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the wear resistance of the valve plate. [Structure] A recess 17 is provided on the surface of a portion of the valve plate body 8a surrounding the two intake / discharge ports 2. A brazing base 13 having a cemented carbide plate 16 brazed on the sliding surface side with respect to the rocking tube 6 is fitted into the recess 17. The brazing base 13 is attached to the valve plate body 8a by the bolts 14 that pass through the bolt holes 15 provided in the valve plate body 8a. Plate 1 whose sliding surface with rocking tube 6 is cemented carbide
Therefore, the wear resistance of the surface of the valve plate body 8a is improved.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a valve plate of an oscillating valve type viscous fluid pump for pumping 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 a fluid piston 4 housed in the fluid cylinder 3 is integrally connected to a hydraulic piston of a main hydraulic cylinder (not shown) via a rod 5, The fluid pistons 4 are alternately reciprocated in the two fluid cylinders 3 by alternately advancing and retracting the two main hydraulic cylinders. 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 is located inside the two suction / discharge ports 2. The attached valve plate 8 is contacted so that it can be swung in the left-right direction, and the other end of the swing tube 6 is connected to the pressure feed 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 pump 3 is pumped through the inside of the rocking 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. Will come. If a gap 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 portion, sealing cannot be performed, and Fall into malfunction.

In order to prevent such a situation, in the conventional valve plate, the surface of the rocking tube 6 which is a sliding surface with the valve ring 7 is hardened by welding or a high chromium film is formed. A cast iron plate is used. Further, as shown in FIG. 4 (a), a ring 12 made of cemented carbide is heat-fitted or cold-fitted on the valve plate body 8a which is the base material to form the rocking tube 6. Most of them tried to prevent abrasion due to sliding.

[0006]

[Problems to be solved by the device]

 However, in the case of the above-mentioned conventional valve plate having a hard facing layer on its surface, when the hard facing layer wears due to sliding with the oscillating tube 6, the subsequent wear of the base material rapidly progresses. Also, in the case of a valve plate made of high chromium cast iron, the life for a viscous fluid using hard aggregate is almost the same as that of the hardfacing type, and a long life cannot be expected. Further, in the case of the valve plate 8 in which the cemented carbide ring 12 is fixed to the valve plate body 8a as shown in FIG. 4 (a), valve plates other than the cemented carbide ring 12 as shown in FIG. 4 (b). There is a risk that the surface of the main body 8a will be worn away early on the valve plate main body 8a side due to the difference in hardness, and the tightening force of the cemented carbide ring 12 will be reduced, causing the cemented carbide ring 12 to come off from the valve plate main body 8a. It has been found .

Therefore, the present invention improves the wear resistance of the sliding surface of the valve plate body that slides with the valve ring at one end of the oscillating tube, and easily replaces it even if the sliding surface of the valve plate body surface wears. It tries to be able to do it.

[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. In a vibrating valve type viscous fluid pump in which two fluid pressure feeding cylinders are switched to a suction side and a discharge side, a valve ring on the rocking tube side when the rocking tube swings left and right A brazing base is attached to the surface of the valve plate body that slides with the bolt by bolting, and a cemented carbide plate is brazed and integrated with the surface of the brazing base.

[0009]

[Action]

 The brazing base, which is brazed with a cemented carbide plate on the surface, is attached to the surface of the valve plate body by bolting, so even if it slides with the valve ring at one end of the oscillating tube, the sliding surface is all cemented carbide. Since it is an alloy, it has improved wear resistance and a longer service life, and the brazed base is bolted so it can be easily replaced.

[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 with the rocking valve shown in FIG. 3, a valve ring 7 is fitted to one end of a rocking tube 6 housed in the hopper 1. The connection shaft 10 fixed to the rocking pipe 6 is attached to the rocking pipe 6 so as to rock the valve plate 8 in the left-right direction, and the other end of the rocking pipe 6 is connected to the pressure feeding pipe 9 through the hopper 1. In the configuration in which one of the two suction and discharge ports 2 of the hopper 1 is alternately brought into communication with the fluid cylinder 3 by swinging one end side of the swing pipe 6 through the The above-mentioned valve plate 8 is configured such that the brazing base 13 brazed with the cemented carbide plate 16 is bolted to the surface of the valve plate body 8a.

That is, a recess 17 is formed on the surface of the valve plate main body 8 a surrounding the two intake / discharge ports 2, and the intake / discharge port 2 corresponding to the intake / discharge port 2 is hollowed out in the recess 17. The brazing base 13 is fitted, and the brazing base 13 is tightened and fixed to the valve plate body 8a by the bolts 14 inserted through the bolt holes 15 provided at a plurality of positions of the valve plate body 8a. A cemented carbide plate 16 is integrated by brazing on the sliding surface of the oscillating tube 6 which is the surface of the soldered base 13, and the cemented carbide plate 16 and the brazed base 13 are bolted to each other by a valve plate. It can be attached to and detached from G8.

When the rocking tube 6 is rocked to the left and right in the hopper 1 in the operation of the rocking valve type viscous fluid pump, the valve ring 7 at one end of the rocking tube 6 slides on the surface of the valve plate 8. However, in the valve plate of the present invention, since the cemented carbide plate 16 is brazed to the surface of the brazing base 13, the valve plate main body 8a side has a hardness difference as in the conventional example shown in FIG. The situation of rapid wear is eliminated, and the cemented carbide plate 16 will not drop from the valve plate body 8a. Further, even if the cemented carbide plate 16 on the surface of the valve plate body 8a that is in contact with the valve ring 7 is worn and a gap occurs in the sliding surface between the plate 16 and the valve ring 7, It is not necessary to replace the entire valve plate body 8a, and the brazing base 13 bolted to the valve plate body 8a can be easily replaced with a new one by removing the bolt 14.

It should be noted that the present invention is not limited to the above-described embodiments, and it goes without saying that various changes can be made without departing from the scope of the present invention.

[0015]

[Effect of device]

 As described above, according to the valve plate of the oscillating valve type viscous fluid pump of the present invention, the oscillating pipe inserted in the hopper is oscillated to the left and right, and the viscous fluid sucked into the fluid cylinder is oscillated in the oscillating pipe. In a viscous fluid pump that is pressure-fed through a valve plate that slides with the valve ring at the tip of the rocking tube when the rocking tube swings left and right, a cemented carbide plate on the surface of the body Since the brazed brazing base is integrated by bolting, there is no problem of uneven wear due to hardness difference and the resulting loss of the valve plate body, and the sliding surface has excellent wear resistance. In addition to improving the life, the brazing base can be easily replaced in the case of wear, and maintainability can be improved. ..

[Brief description of drawings]

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

FIG. 2 is a front view showing the overall shape of the valve plate as seen from the direction AA 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 plate,
(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 8 Valve Plate 8a Valve Plate Body 11 Operating Lever 13 Brazing Base 14 Bolt 15 Bolt Hole 16 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. In a swing valve type viscous fluid pump in which a cylinder is switched between a suction side and a discharge side, a valve plate of a portion that slides with a valve ring on the swing tube side when the swing tube swings left and right. The brazing base is attached to the surface of the main body by bolting, and the surface of the brazing base is
A valve plate for an oscillating valve type viscous fluid pump, characterized in that a plate of cemented carbide is brazed and integrated.