CN219159289U

CN219159289U - Overflow valve for hydraulic reversing valve of dump truck

Info

Publication number: CN219159289U
Application number: CN202223555807.0U
Authority: CN
Inventors: 孙夕龙
Original assignee: Wuxi Interpump Weifu Hydraulics Company Ltd
Current assignee: Wuxi Interpump Weifu Hydraulics Company Ltd
Priority date: 2022-12-29
Filing date: 2022-12-29
Publication date: 2023-06-09
Anticipated expiration: 2032-12-29

Abstract

The utility model relates to an overflow valve for a hydraulic reversing valve of a dump truck, which comprises a valve body, a valve seat, a valve core, a spring and a spring seat, wherein the spring is arranged in the valve body; one end of the valve seat is in threaded connection with the reversing valve, the other end of the valve seat is provided with a valve core hole, and a valve core which can be matched with the spring seat is arranged in the valve core hole. According to the direct-acting overflow valve, through the structure, the opening and closing actions are rapid, and part of fine foreign matters can be allowed to pass through an internal flow channel of the overflow valve, so that the fault of valve core clamping stagnation of the reversing valve caused by the blockage of the overflow valve can be avoided, and the smooth work of the reversing valve is ensured; the utility model has simple structure, easy processing and manufacturing, convenient maintenance and strong practicability.

Description

Overflow valve for hydraulic reversing valve of dump truck

Technical Field

The utility model belongs to the technical field of overflow valves, and relates to an overflow valve for a hydraulic reversing valve of a dump truck.

Background

The dumper is used as an engineering vehicle, the unloading operation is generally controlled by adopting a hydraulic reversing valve, and an overflow valve in the hydraulic reversing valve is basically a pilot overflow valve at present, however, the pilot overflow valve is used for pressure relief by the action of a main valve rod when in operation, and the overflow valve plays a role in guiding and increases the action of the main valve rod; and the drift diameter of the pilot overflow valve is smaller, and the self-use environment of the dump truck is worse, especially for the mining dump truck, the overflow valve is often blocked by foreign matters, the valve core cannot be closed, the dump truck cannot be unloaded, and the working efficiency is reduced.

Disclosure of Invention

The utility model aims to overcome the defects in the prior art, solve the problem that foreign matters entering into an overflow valve for a dumper reversing valve are blocked and a valve core cannot be closed, and provide the overflow valve for the dumper hydraulic reversing valve.

In order to achieve the above purpose, the following technical scheme is adopted:

the overflow valve for the hydraulic reversing valve of the dump truck comprises a valve body, a valve seat, a valve core, a spring and a spring seat, wherein the spring is arranged in the valve body, one end of the spring is connected with the spring seat, a guide pillar is arranged on the spring seat, and the guide pillar stretches into the spring; the valve seat is in threaded connection in the reversing valve, one end of the valve seat is provided with a valve hole, the other end of the valve seat is provided with a valve core hole communicated with the valve hole, and the valve core hole can be communicated with an oil return channel in the reversing valve; and a valve core which can be matched with the spring seat is arranged in the valve core hole.

Preferably, the valve hole has a diameter smaller than that of the valve core hole.

Preferably, a mounting hole is formed in the valve body, and the spring is mounted in the mounting hole; the outside of the valve body is provided with external threads, and one end of the valve body is in threaded connection with the reversing valve.

Preferably, a lock nut is arranged on the outer side of the valve body.

Preferably, a sealing ring is arranged on the outer side of the upper end of the valve body.

Preferably, the valve core is a sphere, and the spring seat is provided with a groove which can be matched with the valve core.

Compared with the prior art, the utility model has the following advantages:

according to the direct-acting overflow valve structure, when the valve core is opened, the valve core hole is directly communicated with the oil return channel, the pressure relief action is rapid, the apertures of the valve hole and the valve core hole are increased, part of fine foreign matters can be allowed to pass through, the failure of valve core clamping stagnation of the reversing valve caused by the blockage of the overflow valve can be avoided, and the smooth work of the reversing valve is ensured; the opening pressure can be adjusted, so that the use is convenient; the utility model has simple structure, convenient processing and manufacturing and convenient maintenance.

Drawings

FIG. 1 is a schematic view of the present utility model in use.

FIG. 2 is a schematic view of a valve body according to the present utility model.

FIG. 3 is a schematic view of a valve seat according to the present utility model.

FIG. 4 is a schematic view of a spring seat according to the present utility model.

Fig. 5 is a schematic diagram of a pilot relief valve.

In the figure: 1. a valve body; 2. a valve seat; 3. a valve core; 4. a spring; 5. a spring seat; 6. a valve core hole; 7. a valve hole; 8. a mounting hole; 9. a lock nut; 10. sealing grooves; 11. a seal ring; 12. a groove; 13. a reversing valve; 14. a guide post; 15. an annular groove; 16. an oil return passage; 17. a pilot-operated overflow valve; 18. an overflow valve core; 19. a main valve core.

Detailed Description

In order that those skilled in the art will better understand the present utility model, a technical solution in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.

As shown in fig. 1-4, an overflow valve for a hydraulic reversing valve 13 of a dump truck comprises a valve body 1, a valve seat 2, a valve core 3, a spring 4 and a spring seat 5, wherein the spring 4 is arranged in the valve body 1, one end of the spring 4 is connected with the spring seat 5, a guide post 14 is arranged on the spring seat 5, the guide post 14 stretches into the spring 4, the spring 4 can apply an outward force to the spring seat 5, and the guide post 14 prevents the spring seat 5 from tilting;

the valve seat 2 is in threaded connection with the reversing valve 13, one end of the valve seat 2 is provided with a valve hole 7, the other end of the valve seat 2 is provided with a valve core hole 6 communicated with the valve hole 7, hydraulic oil can flow from the valve hole 7 and enter the valve core hole 6, the valve core hole 6 can be communicated with an oil return channel 16 in the reversing valve 13, after the valve core hole 6 is opened, the hydraulic oil can directly flow back to an oil tank through the oil return channel 16, and a pressure relief function is rapidly realized;

the valve core 3 which can be matched with the spring seat 5 is arranged in the valve core hole 6, the spring seat 5 is pushed by a spring, the valve core 3 can be tightly pressed on the end face of the valve hole 7, and the valve core 3 can block the valve hole 7; after the pressure of the hydraulic oil in the valve core hole 6 is larger than the pressure applied by the spring 4 to the spring seat 5, the hydraulic oil can jack the valve core 3 and separate from the end face of the valve hole 7.

Further, the diameter of the valve hole 7 is smaller than that of the valve core hole 6, and the diameter of the valve hole 7 is smaller than that of the valve core hole 6, so that the valve core 3 cannot enter the valve hole 7.

Further, a mounting hole 8 is formed in the valve body 1, and the spring 4 is mounted in the mounting hole 8; an external thread is arranged on the outer side of the valve body 1, and one end of the valve body 1 is in threaded connection with the reversing valve 13.

Further, a lock nut 9 is arranged on the outer side of the valve body 1, and the lock nut 9 is used for reinforcing connection between the valve body 1 and the reversing valve 13.

Further, a sealing ring 11 is arranged on the outer side of the upper end of the valve body 1, an annular groove 15 for accommodating the sealing ring 11 is formed in the reversing valve 13, and the sealing ring 11 prevents hydraulic oil from leaking.

Further, the valve core 3 is a sphere, and the spring seat 5 is provided with a groove 12 which can be matched with the valve core 3.

As shown in fig. 5, the working flow of the pilot relief valve is as follows, after hydraulic oil enters the reversing valve from the oil inlet, part of the hydraulic oil reaches the oil inlet a of the pilot relief valve 17, when the pressure of the hydraulic oil is small, the pilot relief valve 17 is in a closed state, when the pressure of the hydraulic oil rises, the relief valve 18 of the pilot relief valve 17 is pushed, the pilot relief valve 17 is opened, the hydraulic oil flows out from the oil outlet b from the inside of the pilot relief valve 17, enters the oil storage chamber c at the tail part of the main valve 18 of the reversing valve, the pressure in the oil storage chamber c rises, and the hydraulic oil pushes the main valve 19 to move leftwards for unloading. Because of the smaller structure, the pilot relief valve 16 has smaller apertures for the oil inlet a and the oil outlet b of the hydraulic oil flow passage 17.

Working principle: when the valve seat 2 is in use, the valve seat 2 is firstly in threaded connection with the interior of the reversing valve 13, the valve core 3 is arranged in the valve core hole 6, the spring 4 is arranged in the mounting hole 8, the guide pillar of the spring seat 5 is inserted into the interior of the spring 4, the sealing ring 11 is arranged in the annular groove 15, the locking nut 9 is in threaded connection with the outer side of the valve body 1, the valve body 1 is arranged on the reversing valve 13, and the spring seat 5 is matched with the valve core 3 after the valve core is arranged in place; the lock nut 9 is screwed to be tightly attached to the outer wall of the reversing valve 13, so that the strengthening and fixing effects are achieved;

after the hydraulic oil enters the reversing valve 13, the hydraulic oil can flow to the valve core hole 6 through the valve hole 7, when the pressure of the hydraulic oil is larger than the thrust of the spring 4, the hydraulic oil pushes the valve core 3 away from the end face of the valve hole 7, and at the moment, the hydraulic oil can return to the oil tank through the pressure relief loop;

the opening pressure of the valve core 3 can be adjusted by adjusting the pretightening force of the spring 4; the pretightening force of the spring 4 can be adjusted by rotating the valve body 1; after the pressure adjustment is finished, the lock nut 9 is screwed.

It is to be understood that the above embodiments are merely illustrative of the application of the principles of the present utility model, but not in limitation thereof. Various modifications and improvements may be made by those skilled in the art without departing from the spirit and substance of the utility model, and are also considered to be within the scope of the utility model.

Claims

1. The utility model provides an overflow valve for hydraulic reversing valve of tipper, includes valve body (1), disk seat (2), case (3), spring (4) and spring holder (5), characterized by: a spring (4) is arranged in the valve body (1), one end of the spring (4) is connected with a spring seat (5), a guide post (14) is arranged on the spring seat (5), and the guide post (14) stretches into the spring (4); the valve seat (2) is in threaded connection with the reversing valve (13), one end of the valve seat (2) is provided with a valve hole (7), the other end of the valve seat (2) is provided with a valve core hole (6) communicated with the valve hole (7), and the valve core hole (6) can be communicated with an oil return channel (16) in the reversing valve (13); a valve core (3) which can be matched with the spring seat (5) is arranged in the valve core hole (6).

2. The relief valve for a hydraulic directional valve of a dump truck according to claim 1, characterized in that: the diameter of the valve hole (7) is smaller than that of the valve core hole (6).

3. The relief valve for a hydraulic directional valve of a dump truck according to claim 1, characterized in that: a mounting hole (8) is formed in the valve body (1), and the spring (4) is mounted in the mounting hole (8); the outside of valve body (1) is provided with the external screw thread, the one end spiro union of valve body (1) is in switching-over valve (13).

4. The relief valve for a hydraulic directional valve of a dump truck according to claim 3, characterized in that: a lock nut (9) is arranged on the outer side of the valve body (1).

5. The relief valve for a hydraulic directional valve of a dump truck according to claim 1, characterized in that: a sealing ring (11) is arranged on the outer side of the upper end of the valve body (1).

6. The relief valve for a hydraulic directional valve of a dump truck according to claim 1, characterized in that: the valve core (3) is a sphere, and the spring seat (5) is provided with a groove (12) which can be matched with the valve core (3).