CN215672937U

CN215672937U - Oil supplementing overflow valve for high-locking-torque excavator main control valve

Info

Publication number: CN215672937U
Application number: CN202121301388.0U
Authority: CN
Inventors: 马宗宇; 胡海建; 余红波; 白永刚; 陈满
Original assignee: Longgong Shanghai Precision Hydraulic Components Co ltd
Current assignee: Longgong Shanghai Precision Hydraulic Components Co ltd
Priority date: 2021-06-10
Filing date: 2021-06-10
Publication date: 2022-01-28
Anticipated expiration: 2031-06-10

Abstract

The utility model discloses an oil supplementing overflow valve for a main control valve of a high-locking-torque excavator, which is characterized by comprising a valve seat, wherein one side of the outer part of the valve seat is in interference fit with a main valve mounting hole, the other side of the outer part of the valve seat is in fit with a conical surface of a valve sleeve, and the inner part of the valve seat is connected with a valve core to form linear sealing; one end of the valve sleeve is matched with the valve seat, the other end of the valve sleeve is in clearance fit with the conical valve seat to play a sealing role, the interior of the valve sleeve is in clearance fit with the valve core, a small valve core is arranged in the valve core, and one end of the small valve core is connected with the conical valve seat through a small spring. The overflow valve is not sensitive to the installation torque due to the special structural design, and can be installed by adopting uniform high torque; the mechanical seal is adopted at the high-pressure part, so that the service life of the element is prolonged; the valve seat and the valve core form linear sealing, so that the leakage amount is reduced, and the cost is reduced.

Description

Oil supplementing overflow valve for high-locking-torque excavator main control valve

Technical Field

The utility model relates to an oil supplementing overflow valve for a high-locking-torque excavator main control valve, in particular to an oil supplementing overflow valve for an excavator main control valve, which is insensitive to installation torque, long in element service life and low in processing cost, and belongs to the technical field of hydraulic devices.

Background

The oil supplementing and overflowing valve for the main control valve of the excavator is mainly used for limiting or controlling the highest load pressure of a hydraulic execution element, namely an oil cylinder, and preventing an oil way and an oil cylinder cavity from generating negative pressure so as to protect the safety and reliability of the whole device and the service life of hydraulic equipment. When the main control valve is installed, the oil supplementing overflow valve needs to be locked by applying torque, and the oil supplementing overflow valve is deformed by applying the locking torque, so that the pressure fluctuation and the insensitive response of the oil supplementing overflow valve frequently occur. In addition, the excavator has long continuous operation time, complex and severe working conditions, low oil cleanliness and the like, a sealing device at a high-pressure part of a hydraulic element can be accelerated to age, wear and damage, and the maintenance cost is very high because the working site of the whole excavator is generally far and the oil-supplementing overflow valve is frequently stopped and needs to be repaired when in failure. In order to solve the faults and improve the installation and the use performance of products, the oil supplementing overflow valve for the main control valve of the excavator is structurally improved.

Disclosure of Invention

The technical problem to be solved by the utility model is as follows: the problems that an oil supplementing overflow valve for a main control valve of an excavator is sensitive to the installation torque, the oil supplementing overflow valve fluctuates and the response is insensitive are solved; the fault rate of the oil-supplementing overflow valve caused by aging, abrasion, damage and the like of the sealing device at the high-pressure part in the using process of the excavator is reduced, and the problems of difficult processing and high cost of parts of the oil-supplementing overflow valve are solved.

In order to solve the technical problem, the technical scheme of the utility model provides an oil supplementing overflow valve for a main control valve of a high-locking-torque excavator, which is characterized by comprising a valve seat, wherein one side of the outer part of the valve seat is in interference fit with a main valve mounting hole, the other side of the outer part of the valve seat is in fit with a conical surface of a valve sleeve, and the inner part of the valve seat is connected with a valve core to form linear sealing; one end of the valve sleeve is matched with the valve seat, the other end of the valve sleeve is in clearance fit with the conical valve seat to play a sealing role, the interior of the valve sleeve is in clearance fit with the valve core, a small valve core is arranged in the valve core, one end of the small valve core is connected with the conical valve seat through a small spring, and one end of the valve core is connected with the conical valve seat through a large spring; the middle part of the cone valve seat is matched with the cone valve core to form line sealing, the cone valve seat is matched with the small nut through the external tooth locking gasket, the pressure regulating spring connected with the cone valve core is arranged inside the small nut, the rear end of the small nut is connected with the regulating rod, and the outer part of the small nut is connected with the valve sleeve through the large nut.

Preferably, the large nut is locked with the main control valve, a seal is formed between the large nut and the main control valve through the first O-shaped seal ring, and the large nut is matched with the outer gap of the valve sleeve to play a sealing role.

Preferably, the small nut is connected with the large nut, sealing is formed between the small nut and the large nut through an O-shaped sealing ring II, and the small nut presses the valve sleeve on the valve seat after passing through the external tooth locking gasket and the conical valve seat.

Preferably, the adjusting rod is connected with the small nut, a seal is formed between the adjusting rod and the small nut through the O-shaped sealing ring III, and the adjusting rod is provided with a locking nut capable of being locked and fixed.

Preferably, the mounting cavity of the pressure regulating spring is communicated with the oil cavity of the valve sleeve through a small nut radial processing hole and a valve sleeve outer cylindrical surface processing axial groove, and the pressure regulating spring presses the cone valve core on the cone valve seat to form linear sealing.

Preferably, the joint of the valve core and the valve sleeve is provided with a fourth O-shaped sealing ring, and the front end of the fourth O-shaped sealing ring is provided with a retaining ring with a buffering effect.

Preferably, the small valve core is provided with a damping hole at one end for mounting the small spring.

Preferably, the external tooth locking gasket transmits the axial pressing force of the small nut to the cone valve seat and the valve sleeve, so that the small nut is prevented from loosening in the use process, and the valve sleeve is prevented from being deformed by the axial pressing force.

The overflow valve is not sensitive to the installation torque due to the special structural design, and can be installed by adopting uniform high torque; the mechanical seal is adopted at the high-pressure part, so that the service life of the element is prolonged; the valve seat and the valve core form linear sealing, so that the leakage amount is reduced; the important design dimensions are integrated to the good process structures of the valve seat, the valve core, the valve sleeve and all parts, and the processing cost is reduced.

Drawings

Fig. 1 is a schematic structural diagram of an oil supplementing and overflowing valve for a main control valve of a high-locking-torque excavator.

Detailed Description

In order to make the utility model more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings.

As shown in fig. 1, the oil supplementing overflow valve for the main control valve of the high-locking-torque excavator is characterized by comprising a valve seat 1, wherein one side of the outer part of the valve seat 1 is in interference fit with a main valve mounting hole, the other side of the outer part of the valve seat 1 is in conical fit with a valve sleeve 4, and the inner part of the valve seat 1 is connected with a valve core 2 to form linear sealing; one end of the valve sleeve 4 is matched with the valve seat 1, the other end of the valve sleeve is in clearance fit with the conical valve seat 9 to play a sealing role, the interior of the valve sleeve 4 is in clearance fit with the valve core 2, the interior of the valve core 2 is provided with the small valve core 3, one end of the small valve core 3 is connected with the conical valve seat 9 through the small spring 8, and one end of the valve core 2 is connected with the conical valve seat 9 through the large spring 7; the middle part of the cone valve seat 9 is matched with the cone valve core 11 to form line sealing, the cone valve seat 9 is matched with a small nut 15 through an external tooth locking gasket 18, a pressure regulating spring 13 connected with the cone valve core 11 is arranged in the small nut 15, the rear end of the small nut 15 is connected with an adjusting rod 17, the outer part of the small nut 15 is connected with the valve sleeve 4 through a large nut 10, the large nut 10 is locked with the main control valve and forms sealing with the main control valve through an O-shaped sealing ring I19, the large nut 10 is in clearance fit with the outer part of the valve sleeve 4 to play a sealing role, the small nut 15 is connected with the large nut 10 and forms sealing with the large nut 10 through an O-shaped sealing ring II 12, the small nut 15 presses the valve sleeve 4 on the valve seat 1 through the external tooth locking gasket 18 and the cone valve seat 9, the adjusting rod 17 is connected with the small nut 15 and forms sealing with the small nut 15 through an O-shaped sealing ring III 14, the adjusting rod 17 is provided with a locking nut 16 capable of locking and fixing, adjust pole 17 and fix on little nut 15 through lock nut 16 locking, pressure regulating spring 13's installation cavity communicate with each other through little nut 15 radial processing hole and the oil pocket of valve barrel 4 outer cylindrical surface processing axial groove and valve barrel 4, pressure regulating spring 13 compresses tightly cone valve core 11 on cone valve seat 9 and forms the line seal, case 2 and the junction of valve barrel 4 be equipped with O shape sealing washer four 6, the front end of O shape sealing washer four 6 is equipped with retaining ring 5 that plays cushioning effect, little valve core 3 be equipped with the damping hole at the one end of installation little spring 8.

The utility model provides a high locking moment is oil supplementing overflow valve for excavator main control valve, it includes: the valve seat 1 is in interference fit with a main valve mounting hole to play a role in sealing, the valve seat 1 and the valve sleeve 4 are positioned in a conical surface mode, the conical surface of the valve core 2 and the valve seat 1 form linear sealing, the outer cylindrical surface of the valve core 2 is in clearance fit with the valve sleeve 4, the inner cylindrical surface of the valve core 2 is in clearance fit with the small valve core 3, the conical valve seat 9 and the valve sleeve 4 are in clearance fit to play a role in sealing, the contacted axial end surface plays a role in secondary sealing through pressing force, the conical surface of the conical valve core 11 and the conical valve seat 9 form linear sealing, the small nut 15 is arranged on the large nut 10, the pretightening force of the pressure regulating spring 13 is changed through regulating the regulating rod 17 arranged on the small nut 15, so that the overflow pressure is regulated, the small nut 15 exerts the pressing force on the valve sleeve 4 and the conical valve seat 9 to fix the axial position of the small nut 15, in order to prevent the valve sleeve 4 from deforming caused by the loosening of the pressing force exerted in the using process, the external tooth gasket is additionally arranged between the small nut 15 and the conical valve seat 9, for the small nut 15 to be anti-loose and to counteract deformation of the valve sleeve 4. In order to accelerate the response of the valve core 2 and the stability of the valve core 2 during the action, an oil through damping hole is added at the end part of the small valve core 3, and an O-shaped sealing ring four 6 arranged on the valve core 2 plays a damping role during the action of the valve core 2 besides the sealing function. The large nut 10 is used for installing and locking the oil-supplementing overflow valve of the utility model at the position of a main control valve installation hole, and the large nut 10 is in clearance fit with the valve sleeve 4, so that the locking torque during installation has no influence on the valve sleeve 4, in addition, the pressing force applied by the small nut 15 presses the valve sleeve 4 on the valve seat 1 after passing through the external tooth locking gasket 18 and the conical valve seat 9, the external tooth locking gasket 18 is deformed by the pressing force, the effect of buffering is achieved in the transmission process of the pressing force, and the axial stress condition of the valve sleeve 4 is better.

The working process of the utility model is as follows:

under the normal state, the conical valve core 11 separates the installation cavity of the large spring 7, the installation cavity of the small spring 8 and the installation cavity of the pressure regulating spring 13 through the line seal of the conical surface of the conical valve core 11 matched with the conical valve seat 9 under the action of the pressure regulating spring 13; the line seal of the conical surface of the valve core 2 and the valve seat 1 is used for separating an oil cavity connected with the valve seat 1 and an oil cavity connected with the valve sleeve 4. The pressure of the oil cavity connected with the valve seat 1 acts on the conical valve core 11 through the small valve core 3, and the pressure of the oil cavity is transmitted to the large spring 7 and the small spring 8 installation cavity through the damping hole on the small valve core 3, so that the valve core 2 is tightly pressed on the valve seat 1 to have the function of preventing leakage, when the pressure of the oil cavity connected with the valve seat 1 is higher than the set pressure of the pressure regulating spring 13, the line sealing part of the conical surface of the conical valve core 11 matched with the conical valve seat 9 is opened, so that the oil entering the large spring 7 and the small spring 8 installation cavity is communicated with the oil cavity connected with the valve sleeve 4 through the pressure regulating spring 13 installation cavity, therefore, the valve core 2 acts, the line sealing part of the conical surface of the valve core 2 matched with the valve seat 1 is opened, the oil cavity connected with the valve seat 1 is communicated with the oil cavity connected with the valve sleeve 4, the pressure of the oil cavity connected with the valve seat 1 is limited to realize the overflow function, the damping hole at the end part of the small valve core 3 accelerates the response of the valve core 2, and acts with the O-shaped sealing ring four 6 arranged on the valve core 2 in the action process of the valve core 2, pressure fluctuations are prevented. When the pressure of the oil cavity connected with the valve seat 1 is lower than that of the oil cavity connected with the valve sleeve 4, the pressure of the oil cavity connected with the valve sleeve 4 exerts acting force on the valve core 2, the line seal of the conical surface of the valve core 2 matched with the valve seat 1 is opened, the oil cavity connected with the valve seat 1 is communicated with the oil cavity connected with the valve sleeve 4, the negative pressure of the oil cavity connected with the valve seat 1 is prevented, and the oil supplementing function is realized.

Claims

1. The oil supplementing overflow valve for the master control valve of the high-locking-torque excavator is characterized by comprising a valve seat (1), wherein one side of the outer part of the valve seat (1) is in interference fit with a main valve mounting hole, the other side of the outer part of the valve seat (1) is in conical fit with a valve sleeve (4), and the inner part of the valve seat (1) is connected with a valve core (2) to form linear sealing; one end of the valve sleeve (4) is matched with the valve seat (1), the other end of the valve sleeve is in clearance fit with the conical valve seat (9) to play a sealing role, the inside of the valve sleeve (4) is in clearance fit with the valve core (2), the inside of the valve core (2) is provided with the small valve core (3), one end of the small valve core (3) is connected with the conical valve seat (9) through the small spring (8), and one end of the valve core (2) is connected with the conical valve seat (9) through the large spring (7); the middle part of the cone valve seat (9) is matched with the cone valve core (11) to form line sealing, the cone valve seat (9) is matched with the small nut (15) through the external tooth locking gasket (18), the pressure regulating spring (13) connected with the cone valve core (11) is arranged inside the small nut (15), the rear end of the small nut (15) is connected with the regulating rod (17), and the outer part of the small nut (15) is connected with the valve sleeve (4) through the large nut (10).

2. The oil supplementing and overflowing valve for the main control valve of the high-locking-torque excavator is characterized in that the large nut (10) is locked with the main control valve and forms sealing with the main control valve through a first O-shaped sealing ring (19), and the large nut (10) is matched with an external gap of the valve sleeve (4) to play a role in sealing.

3. The oil supplementing and overflowing valve for the main control valve of the high-locking-torque excavator is characterized in that the small nut (15) is connected with the large nut (10) and forms sealing with the large nut (10) through the O-shaped sealing ring II (12), and the small nut (15) presses the valve sleeve (4) on the valve seat (1) through the external tooth locking gasket (18) and the conical valve seat (9).

4. The oil supplementing overflow valve for the main control valve of the high-locking-torque excavator is characterized in that the adjusting rod (17) is connected with the small nut (15) and forms sealing with the small nut (15) through the O-shaped sealing ring III (14), the adjusting rod (17) is provided with a locking nut (16) capable of being locked and fixed, and the adjusting rod (17) is locked and fixed on the small nut (15) through the locking nut (16).

5. The oil supplementing and overflowing valve for the main control valve of the high-locking-torque excavator is characterized in that an installation cavity of the pressure regulating spring (13) is communicated with an oil cavity of the valve sleeve (4) through a small nut (15) radial machining hole and a valve sleeve (4) outer cylindrical surface machining axial groove, and the conical valve core (11) is pressed on the conical valve seat (9) by the pressure regulating spring (13) to form linear sealing.

6. The oil-supplementing overflow valve for the main control valve of the high-locking-torque excavator is characterized in that an O-shaped sealing ring four (6) is arranged at the joint of the valve core (2) and the valve sleeve (4), and a retaining ring (5) with a buffering effect is arranged at the front end of the O-shaped sealing ring four (6).

7. The oil-replenishing overflow valve for the main control valve of the high-locking-torque excavator is characterized in that a damping hole is formed in one end, where a small spring (8) is installed, of the small valve core (3).