Check valve with wear-resistant pin shaft

Abstract

The check valve comprises a rocker assembly, a hanging frame, the pin shaft, a screw and a positioning pin, the rocker assembly comprises a valve clack, a rocker and a valve clack screw, the valve clack is fixedly connected to the lower end of the rocker through the valve clack screw, and the upper end of the rocker is rotationally connected to the lower end of the hanging frame through the pin shaft; the hanging frame is fixedly connected to the valve body, and surfacing hard alloy is arranged at the two ends of the pin shaft and the inner hole wall, matched with the pin shaft, of the hanging frame. The novel structure is adopted, the oil injection hole is added, so that the valve clack is more flexible to open and close, the pin shaft and the rocker rotate synchronously without abrasion between the pin shaft and the rocker, the surface of the contact surface of the pin shaft and the hanging frame is hardened, abrasion is greatly reduced compared with that of a previous structure, and the service life of the pin shaft is effectively prolonged; and the wear-resisting and wear-resisting device is simple and reasonable in structure, low in manufacturing cost and suitable for popularization and application.

Description

Technical Field

[0001] The present invention relates to a check valve, and more particularly to a check valve with wear-resistant pin shafts. Background Art

[0002] As a one-way flow valve, the check valve has the advantages of an automatic switch valve flap and preventing the reverse flow of the medium, and is widely used. However, in the conventional swing check valve, the pin shafts at the connection between the rocker and the hanger are easily worn due to frequent opening and closing during operation, seriously reducing the service life of the valve. During operation, due to frequent impacts and dimensional wear, the strength becomes weak and there is even a risk of fracture. For this reason, we propose a check valve with wear-resistant pin shafts. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a check valve with wear-resistant pin shafts, which solves the problem that the pin shafts at the connection between the rocker and the hanger of the conventional swing check valve are easily worn due to frequent opening and closing during operation, seriously reducing the service life of the valve, and due to frequent impacts and dimensional wear during operation, the strength becomes weak and there is even a risk of fracture.

[0004] To solve the above technical problem, the present invention provides the following technical solutions: A check valve with wear-resistant pin shafts, comprising a rocker assembly, a hanger, a pin shaft, a screw and a positioning pin. The rocker assembly includes a valve flap, a rocker and a valve flap screw. The valve flap is fixedly connected to the lower end of the rocker through the valve flap screw. The upper end of the rocker is rotatably connected to the lower end of the hanger through the pin shaft. The hanger is fixedly connected to the valve body. Hardfacing carbide is provided on both ends of the pin shaft and on the inner hole wall of the hanger that cooperates with the pin shaft.

[0005] On the basis of the above solution, a positioning pin is fixedly connected to the valve flap and the valve flap screw, and the outer end of the positioning pin is fixedly welded to the valve flap screw.

[0006] On the basis of the above solution, the top end of the rocker and the pin shaft are fixedly connected by screws. There are multiple screws, and the top ends of the screws and the top end of the rocker are fixedly connected by spot welding.

[0007] On the basis of the above solution, an oil injection hole is opened at a position corresponding to the hardfacing carbide at the bottom end of the hanger.

[0008] The beneficial effects of the present invention compared with the prior art are as follows: A check valve with wear-resistant pin shafts adopts a new structure and is provided with an oil injection hole, so the valve flap is more flexible when opening and closing. The pin shaft and the rocker rotate synchronously and there is no wear between them. In addition, the contact surface between the pin shaft and the hanger is surface hardened, and the wear is greatly reduced compared with the previous structure, effectively extending the service life of the pin shaft, reducing the performance degradation and safety hazards caused by wear. The structure of the present invention is simple and reasonable, and the manufacturing cost is low, which is suitable for popularization and use. Brief Description of the Drawings

[0009] Figure 1 This is a schematic structural view of a check valve with wear-resistant pin shafts according to the present invention; Figure 2 This is a partial structural view of a check valve with wear-resistant pin shafts according to the present invention.

[0010] The reference numerals in the figure are: 1 - valve flap, 2 - rocker, 3 - valve flap screw, 4 - rocker assembly, 5 - hanger, 6 - pin shaft, 7 - screw, 8 - positioning pin, 9 - spot welding, 10 - surfacing of hard alloy, 11 - oil injection hole. Specific embodiments

[0011] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0012] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0013] Refer to Figures 1 to 2 It can be known that: a check valve with wear-resistant pin shafts includes a rocker assembly 4, a hanger 5, a pin shaft 6, a screw 7 and a positioning pin 8. The rocker assembly 4 includes a valve flap 1, a rocker 2 and a valve flap screw 3. The valve flap 1 is fixedly connected to the lower end of the rocker 2 through the valve flap screw 3. The upper end of the rocker 2 is rotatably connected to the lower end of the hanger 5 through the pin shaft 6. The hanger 5 is fixedly connected to the valve body. Surfacing of hard alloy 10 is provided on both ends of the pin shaft 6 and on the inner hole wall of the hanger 5 that cooperates with the pin shaft 6. The surfacing of hard alloy 10 can play a role in wear resistance.

[0014] A positioning pin 8 is fixedly connected to the valve flap 1 and the valve flap screw 3. The outer end of the positioning pin 8 is fixedly welded to the valve flap screw 3. The positioning pin 8 can prevent the valve flap screw 3 from loosening. The top end of the rocker 2 and the pin shaft 6 are fixedly connected through a screw 7. There are multiple screws 7. The top end of the screw 7 and the top end of the rocker 2 are fixedly connected through spot welding 9. The spot welding 9 can prevent the screw 7 from loosening. An oil injection hole 11 is provided at a position corresponding to the surfacing of hard alloy 10 at the bottom end of the hanger 5. Injecting oil through the oil injection hole 11 can lubricate the surfacing of hard alloy 10 on the pin shaft 6 and the hanger 5, and reduce the friction between the shaft and the hole.

[0015] Principle and advantages of the present invention: A check valve with wear-resistant pin shafts. Hard alloys with high hardness and wear resistance are surfacing welded on the outer surfaces at both ends of the pin shaft 6 and the inner hole of the hanger respectively. At the same time, two grease injection holes 11 are drilled on the hanger 5, and grease is injected through these holes to lubricate the contact surface between the pin shaft 6 and the hanger 5, reducing the friction coefficient of the contact surface to reduce wear. Two screws 7 are machined on the rocker 2 and the pin shaft 6 to integrate the rocker 2 and the pin shaft 6. In this way, there will be no relative rotation between the inner hole of the rocker 2 and the pin shaft 6 when the valve is opened and closed, thereby reducing wear. The structure of the present invention is simple and reasonable, with good use effect and low manufacturing cost, and is suitable for popularization and use.

[0016] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A pin-wearable check valve, comprising a rocker assembly (4), a hanger (5), a pin (6), a screw (7) and a positioning pin (8), characterized in that: The rocker assembly (4) comprises a valve flap (1), a rocker (2) and a valve flap screw (3); the valve flap (1) is fixedly connected to the lower end of the rocker (2) via the valve flap screw (3); the upper end of the rocker (2) is rotatably connected to the lower end of a bracket (5) via a pin shaft (6); the bracket (5) is fixedly connected to the valve body; and hard alloys (10) are respectively provided at both ends of the pin shaft (6) and on the inner hole wall where the bracket (5) and the pin shaft (6) cooperate with each other.

2. A pin-wear-resistant check valve according to claim 1, characterized in that: A positioning pin (8) is fixedly connected to the valve flap (1) and the valve flap screw (3), and the outer end of the positioning pin (8) is fixed to the valve flap screw (3) by welding.

3. A pin-wear-resistant check valve according to claim 1, characterized in that: The top end of the rocker (2) is fixedly connected to the pin shaft (6) by means of a screw (7), a plurality of screws (7) are provided, and the top end of the screw (7) and the top end of the rocker (2) are fixed by means of spot welding (9).

4. A pin-wear-resistant check valve according to claim 1, characterized in that: An oil filling hole (11) is provided at a position at the bottom end of the hanger (5) corresponding to the surfacing hard alloy (10).

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