CN218207289U

CN218207289U - Screw thread cartridge type load retaining valve for excavator

Info

Publication number: CN218207289U
Application number: CN202222718424.4U
Authority: CN
Inventors: 陈建鹏; 余红波; 白永刚; 刘志远; 辛首元
Original assignee: Longgong Shanghai Precision Hydraulic Components Co ltd
Current assignee: Longgong Shanghai Precision Hydraulic Components Co ltd
Priority date: 2022-10-14
Filing date: 2022-10-14
Publication date: 2023-01-03
Anticipated expiration: 2032-10-14

Abstract

The utility model relates to a screw-thread cartridge type load retaining valve for an excavator, which relates to the field of hydraulic transmission and comprises a main valve body, a first valve body fixedly arranged at the top end of the main valve body and a second valve body fixedly arranged at the top end of the first valve body; the bottom end of the main valve body is provided with an oil inlet, a conical valve core is slidably mounted in the oil inlet, and the side surface of the main valve body is provided with a working end oil port leading to the conical valve core; a first spring is connected between the interior of the conical valve core and the bottom surface of the first valve body, and a first throttling port which is communicated with an oil port of the working end and an inner cavity of the conical valve core is formed in the bottom end of the conical valve core. The utility model discloses can realize that the load rises, rises and keeps, decline function, simple structure, the practicality is strong.

Description

Screw-thread cartridge type load retaining valve for excavator

Technical Field

The utility model belongs to the technical field of hydraulic transmission and specifically relates to a dig machine with screw thread cartridge formula load and keep valve is related to.

Background

A thread cartridge type load retaining valve for an excavator is a common hydraulic valve block which prevents the excavator from keeping a heavy object stable when lifting the heavy object and preventing the heavy object from descending.

In the prior art, most common load holding valves on the market are complex in structure, heavy in weight, slow in response, high in noise and poor in sealing performance in the using process, so that a threaded plug-in type load holding valve for an excavator, which can save space and avoid leakage of hydraulic oil, is needed.

SUMMERY OF THE UTILITY MODEL

An object of the present application is to provide a threaded cartridge load holding valve for a shovel to solve the problems set forth in the background art described above.

In order to achieve the above object, the present invention provides a screw-in-cartridge load retaining valve for an excavator, including a main valve body, a first valve body fixedly disposed at a top end of the main valve body, and a second valve body fixedly disposed at a top end of the first valve body;

the bottom end of the main valve body is provided with an oil inlet, a conical valve core is slidably mounted in the oil inlet, and the side surface of the main valve body is provided with a working oil port leading to the conical valve core;

a first spring is connected between the inner part of the conical valve core and the bottom surface of the first valve body, and a first throttling port which is communicated with the working oil port and the inner cavity of the conical valve core is formed in the bottom end of the conical valve core.

Preferably, the main valve body is provided with an L-shaped oil path for communicating the oil inlet with the first valve body side cavity.

Preferably, a threaded oil port is formed in the side surface of the first valve body, and a small valve core, a second spring and a plug are sequentially arranged from inside to outside of the threaded oil port; the small valve core is slidably mounted in the threaded oil port, the plug is in threaded connection with the threaded oil port, and two ends of the second spring are respectively connected with the inside of the small valve core and the end part of the plug.

Preferably, the bottom of the threaded oil port is provided with a circular through hole leading to the L-shaped oil way.

Preferably, the plug is provided with a first O-shaped ring.

Preferably, a threaded through hole is formed in the top end of the first valve body, a screw plug is connected to the threaded through hole in an internal thread manner, a through hole is formed in the screw plug, a valve rod is slidably mounted in the through hole, a second throttling port facing the threaded oil port is formed in the bottom of the valve rod, the top end of the valve rod is located in the second valve body and is fixedly provided with a steel wire check ring, a spring seat is mounted on the steel wire check ring, a third spring is fixedly mounted at the bottom of the spring seat, and the bottom end of the third spring is mounted on the screw plug.

Preferably, the bottom surface of the second valve body is provided with a blind hole, the side surface of the second valve body is provided with an oil outlet leading to the blind hole, a valve sleeve is fixedly mounted in the blind hole, a compression spring is mounted at the bottom of the blind hole of the valve sleeve, and the bottom end of the compression spring is mounted on the first valve body.

Preferably, a second O-shaped ring is installed at the bottom end of the second valve body, a pilot oil port is formed in the top end of the second valve body, and a third O-shaped ring is installed at the bottom end of the first valve body.

Preferably, the bottom end of the plug screw is sleeved with a rubber retainer ring and a fourth O-shaped ring.

Preferably, the main valve body, the first valve body and the second valve body are fixedly connected through screws.

To sum up, the utility model discloses a technological effect and advantage:

1. the utility model discloses in, when needs make the load promote, provide the hydraulic oil of certain pressure to the oil inlet, hydraulic oil enters into working fluid port A under the pressure effect, mention the heavy object when lifting cylinder, some hydraulic oil enters into the cone valve core inner chamber through first choke in the course of the work, the case is in the encapsulated situation this moment, whole working oil pocket is not intercommunicated with the external world, when the oil inlet stops to provide pressure, working cylinder pressure is unchangeable, the volume of revealing is little among the whole process, can ensure that the load maintains the position stability.

2. The utility model discloses in, when the load is lifted off to needs, stop the oil inlet fuel feeding, when letting in guide's pressure oil to the r mouth, case downstream this moment to the case is opened, and hydraulic oil enters into the second choke through first choke, and then backs down little case, can prevent through the design of oil-out that the valve barrel is inside to suppress pressure and realize the pressure release function, promotes the ingenious control hydro-cylinder lift of mode that the valve core control oil circuit leads to and closes through guide's pressure, this design simple structure, and the practicality is strong.

Drawings

FIG. 1 is a schematic cross-sectional view of a threaded cartridge load holding valve for a shovel according to an embodiment of the present disclosure;

FIG. 2 is an isometric view of a threaded cartridge load retention valve for a shovel in accordance with an embodiment of the present disclosure;

FIG. 3 is a schematic cross-sectional view of another perspective of a threaded cartridge load retention valve for a shovel in accordance with an embodiment of the present disclosure;

fig. 4 is a hydraulic schematic diagram of a threaded cartridge load holding valve for a shovel according to an embodiment of the present disclosure.

Reference numerals are as follows: 1. a main valve body; 2. an oil inlet; 3. a cone valve core; 4. a first spring; 5. an L-shaped oil path; 6. a first valve body; 7. an oil outlet; 8. a second valve body; 9. a circular through hole; 10. a third O-ring; 11. a valve stem; 12. a fourth O-ring; 13. a rubber retainer ring; 14. a plug screw; 15. a second orifice; 16. a compression spring; 17. a second O-ring; 18. a third spring; 19. a spring seat; 20. a steel wire retainer ring; 21. a valve housing; 22. a first orifice; 23. a pilot oil port; 24. a small valve core; 25. a second spring; 26. a first O-ring; 27. plugging by screwing; 28. a screw; 29. and a working oil port.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-4 the embodiment of the utility model discloses a dig machine with screw thread cartridge formula load retaining valve is disclosed, including the main valve body 1, there is first valve body 6 on the top of the main valve body 1 through screw 28 fixed mounting, there is second valve body 8 on the top of first valve body 6 through screw 28 fixed mounting, oil inlet 2 has been seted up to the bottom of the main valve body 1, slidable mounting has cone case 3 in oil inlet 2, first choke 22 has been seted up to cone case 3's bottom, the inside fixed mounting of cone case 3 has first spring 4, the top fixed mounting of first spring 4 is in the bottom surface concave hole of first valve body 6.

When a load needs to be lifted, hydraulic oil with a certain pressure is provided for the oil inlet 2, the hydraulic oil enters the working oil port 29 under the action of the pressure, a part of the hydraulic oil enters the inner cavity of the conical valve core 3 through the first throttling port 22 in the working process, the valve core is in a closed state at the moment, the whole working oil cavity is not communicated with the outside, when the oil inlet 2 stops providing the pressure, the pressure of the working oil cylinder is unchanged, the leakage amount in the whole process is small, and the stability of the load maintaining position can be ensured. Through the design of the cone valve core 3, the function of preventing hydraulic oil from flowing back to the oil inlet 2 is realized.

The side surface of the main valve body 1 is provided with a working end oil port 29, the top end of the main valve body 1 is provided with an L-shaped oil path 5, one end of the L-shaped oil path 5 is communicated with the oil inlet 2, the oil inlet 2 is communicated with the working end oil port 29, and the function of communicating the oil inlet 2 with the side cavity of the first valve body 6 is realized through the design of the L-shaped oil path 5.

The side of first valve body 6 has seted up the screw thread hydraulic fluid port, slidable mounting has little case 24 in the screw thread hydraulic fluid port, the internally mounted of little case 24 has second spring 25, the internal thread connection of screw thread hydraulic fluid port has plug 27, the bottom mounting of second spring 25 is on plug 27's top, circular through-hole 9 has been seted up to the screw thread hydraulic fluid port bottom of first valve body 6 side, install first O type circle 26 on the plug 27, through plug 27's design, the function of avoiding 6 fluid of first valve body to reveal has been realized.

Threaded through hole has been seted up on the top of first valve body 6, threaded through hole female connection has plug screw 14, the through-hole has been seted up to plug screw 14's inside, slidable mounting has valve rod 11 in the through-hole, second choke 15 has been seted up to valve rod 11's bottom, valve rod 11's top fixed mounting has steel wire retaining ring 20, install spring holder 19 on the steel wire retaining ring 20, fixed mounting has third spring 18 on the spring holder 19, install on plug screw 14 the bottom of third spring 18, design through plug screw 14, the function of fixed valve rod 11 has been realized.

Oil-out 7 has been seted up to the side of second valve body 8, and the blind hole has been seted up to the bottom surface of second valve body 8, and fixed mounting has valve barrel 21 in the blind hole, and compression spring 16 is installed to the blind hole bottom of valve barrel 21, and compression spring 16's bottom is installed on first valve body 6, through the design of oil-out 7, has realized preventing that second valve body 8 from suppressing the function of pressing.

The second O-shaped ring 17 is installed at the bottom end of the second valve body 8, the guide oil port 23 is formed in the top end of the second valve body 8, the third O-shaped ring 10 is installed at the bottom end of the first valve body 6, and the function of downward movement of the valve rod 11 can be achieved through the design of the guide oil port 23.

The bottom end of the screw plug 14 is sleeved with a rubber retainer ring 13 and a fourth O-shaped ring 12, and the efficient sealing function is realized through the design of the combination of the rubber retainer ring 13 and the fourth O-shaped ring 12.

The working principle of the utility model is as follows:

the load holding valve for the excavator can be used for keeping a working oil cylinder piston to maintain a constant position when in work and preventing a load from descending due to descending of the oil cylinder piston in the use process, when the load needs to be lifted, hydraulic oil with certain pressure is conveyed to the oil inlet 2 through the hydraulic pump, enters the working oil port 29 under the action of pressure and further enters the working oil cylinder so as to lift a heavy object, a part of hydraulic oil enters an inner cavity of the conical valve core 3 through the first throttling port 22 in the heavy object lifting process, at the moment, the valve rod 11 is in a closed state, the pressure in the working oil cylinder is maintained stably, and therefore the load is kept at the constant position;

when the load needs to be unloaded, oil supply to the oil inlet 2 is stopped, pilot pressure oil is introduced into the pilot oil port 23, the valve sleeve 21 moves downwards under the action of the pilot pressure oil to drive the valve rod 11 to move downwards, so that the valve rod 11 is opened, hydraulic oil enters the second throttling port 15 through the first throttling port 22, the small valve core 24 is jacked open, and enters the L-shaped oil way 5, so that the pressure relief function is realized, the pressure of the hydraulic oil in the main valve body 1 is reduced in the flowing process of the hydraulic oil, and the descending of a working oil cylinder is realized;

through the utility model discloses a design can realize that the load rises, rises and keeps, decline function, simple structure, the practicality is strong.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions on some technical features, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of the present invention.

Claims

1. The utility model provides a dig machine with screw thread cartridge formula load retaining valve which characterized in that: the valve comprises a main valve body (1), a first valve body (6) fixedly arranged at the top end of the main valve body (1), and a second valve body (8) fixedly arranged at the top end of the first valve body (6);

an oil inlet (2) is formed in the bottom end of the main valve body (1), a conical valve core (3) is installed in the oil inlet (2) in a sliding mode, and a working end oil port (29) leading to the conical valve core (3) is formed in the side face of the main valve body (1);

a first spring (4) is connected between the inner part of the cone valve core (3) and the bottom surface of the first valve body (6), and a first throttling opening (22) which is communicated with the working end oil port (29) and the inner cavity of the cone valve core (3) is formed in the bottom end of the cone valve core (3).

2. The thread cartridge type load holding valve for the excavator according to claim 1, wherein: the main valve body (1) is provided with an L-shaped oil path (5) for communicating the oil inlet (2) with the side cavity of the first valve body (6).

3. The thread cartridge type load holding valve for the excavator according to claim 2, wherein: a threaded oil port is formed in the side face of the first valve body (6), and a small valve core (24), a second spring (25) and a plug (27) are sequentially arranged from inside to outside of the threaded oil port; the small valve core (24) is slidably mounted in the threaded oil port, the plug (27) is in threaded connection with the threaded oil port, and two ends of the second spring (25) are respectively connected with the inside of the small valve core (24) and the end part of the plug (27).

4. The threaded cartridge load holding valve for excavators according to claim 3, characterized in that: and a circular through hole (9) leading to the L-shaped oil way (5) is formed at the bottom of the threaded oil port.

5. The threaded cartridge load holding valve for excavators according to claim 4, characterized in that: the plug (27) is provided with a first O-shaped ring (26).

6. The threaded cartridge load holding valve for excavators according to claim 5, characterized in that: the improved oil-water mixing valve is characterized in that a threaded through hole is formed in the top end of the first valve body (6), a screw plug (14) is connected to the inner thread of the threaded through hole, a through hole is formed in the screw plug (14), a valve rod (11) is slidably mounted in the through hole, the bottom of the valve rod (11) is provided with a second throttling port (15) facing to a threaded oil port, the top end of the valve rod (11) is located in the second valve body (8) and is fixedly provided with a steel wire check ring (20), a spring seat (19) is mounted on the steel wire check ring (20), a third spring (18) is fixedly mounted at the bottom of the spring seat (19), and the bottom end of the third spring (18) is mounted on the screw plug (14).

7. The threaded cartridge load holding valve for excavators according to claim 6, characterized in that: the bottom surface of the second valve body (8) is provided with a blind hole, the side surface of the second valve body (8) is provided with an oil outlet (7) leading to the blind hole, a valve sleeve (21) is fixedly installed in the blind hole, a compression spring (16) is installed at the bottom of the blind hole of the valve sleeve (21), and the bottom end of the compression spring (16) is installed on the first valve body (6).

8. The threaded cartridge load holding valve for excavators according to claim 7, characterized in that: the bottom end of the second valve body (8) is provided with a second O-shaped ring (17), the top end of the second valve body (8) is provided with a guide oil port (23), and the bottom end of the first valve body (6) is provided with a third O-shaped ring (10).

9. The thread cartridge type load holding valve for the excavator according to claim 8, wherein: the bottom end of the screw plug (14) is sleeved with a rubber retainer ring (13) and a fourth O-shaped ring (12).

10. The threaded cartridge load holding valve for excavators according to claim 1, characterized in that: the main valve body (1), the first valve body (6) and the second valve body (8) are fixedly connected through screws (28).