CN215672935U - Self-adjusting regeneration valve for main valve of hydraulic excavator - Google Patents
Self-adjusting regeneration valve for main valve of hydraulic excavator Download PDFInfo
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- CN215672935U CN215672935U CN202120089861.7U CN202120089861U CN215672935U CN 215672935 U CN215672935 U CN 215672935U CN 202120089861 U CN202120089861 U CN 202120089861U CN 215672935 U CN215672935 U CN 215672935U
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Abstract
The utility model discloses a self-adjusting regeneration valve for a main valve of a hydraulic excavator, which is characterized in that: the large valve sleeve is provided with an O-shaped ring groove and an external thread structure, the large valve sleeve is conveniently, hermetically, tightly and fixedly assembled on a valve body, the front end of the large valve sleeve is fixedly connected with a plug in a sealing mode through threads and an O-shaped sealing ring, a spring seat is tightly attached to the end face of the plug, the large valve element is arranged in the large valve sleeve, a spring is installed on the spring seat and supported on the end face of the excircle of the large valve element, a small valve sleeve is arranged at the right end of the large valve sleeve and limited by the end face of the small valve sleeve, the O-shaped ring groove and a retaining ring groove are arranged on the excircle face of the small valve sleeve, clearance fit with sealing performance is formed between the O-shaped sealing ring and the retaining ring and the large valve sleeve, the small valve element is arranged in the small valve sleeve in clearance fit, the large valve element can be pushed to move under the action of hydraulic oil pressure on the small valve element, and the regenerated flow is controlled according to the opening size of a throttling hole.
Description
Technical Field
The utility model relates to a self-adjusting regeneration valve for a main valve of a hydraulic excavator, and belongs to the technical field of hydraulic systems.
Background
The regeneration valve for the main valve of the hydraulic excavator mainly has the function of flow regeneration when oil return is controlled in a hydraulic system according to oil pressure, when hydraulic oil is supplied to one side of a large cavity of an oil cylinder, a piston of the oil cylinder moves to one side of a small cavity, and at the moment, the excavator executes excavation action. However, under the action of the dead weight of the small arm, insufficient flow supply can occur on one side of the large cavity of the oil cylinder, so that the phenomena of 'air suction' and 'crawling' and the like are caused, and the excavator can not work normally under the actual working condition. The regeneration valve controls the flow rate of return oil regeneration according to the oil pressure of the system, so that the large cavity side is regenerated, the problems of ' sucking air ', creeping ' and the like can be avoided, the stability of a hydraulic system of the excavator is improved, the action coordination of the excavator is kept, and the working efficiency of the excavator is improved.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that the practical performance of an excavator is influenced by ' air suction ', creeping ' and the like caused by insufficient flow supply of a large cavity of an oil cylinder when the excavator excavates.
In order to solve the technical problem, the technical scheme of the utility model is to provide a self-adjusting regeneration valve for a main valve of a hydraulic excavator, wherein when hydraulic oil returns, the opening degree of a passage II is limited by a large valve core through the passage I, the hydraulic oil pressure rises, a regeneration one-way valve of the main valve body is pushed open, and the hydraulic oil flows into a large cavity side to be regenerated. The method is characterized in that: the large valve sleeve is provided with an O-shaped ring groove and an external thread structure, the large valve sleeve is conveniently, hermetically, tightly and fixedly assembled on a valve body, the front end of the large valve sleeve is fixedly connected with a plug in a sealing mode through threads and an O-shaped sealing ring, a spring seat is tightly attached to the end face of the plug, the large valve element is arranged in the large valve sleeve, a spring is installed on the spring seat and supported on the end face of the excircle of the large valve element, a small valve sleeve is arranged at the right end of the large valve sleeve and limited by the end face of the small valve sleeve, the O-shaped ring groove and a retaining ring groove are arranged on the excircle face of the small valve sleeve, clearance fit with sealing performance is formed between the O-shaped sealing ring and the retaining ring and the large valve sleeve, the small valve element is arranged in the small valve sleeve in clearance fit, the large valve element can be pushed to move under the action of hydraulic oil pressure on the small valve element, and the regenerated flow is controlled according to the opening size of a throttling hole.
Preferably, the large valve sleeve is fixed on the main valve body in a threaded fit mode, and the first O-shaped sealing ring which is installed in a matched and sealed mode is selected according to the size of the O-shaped ring groove structure on the outer circle of the large valve sleeve, so that the valve sleeve can be fastened and can be completely sealed.
Preferably, two lines of small holes are uniformly distributed at the outer circle of the valve sleeve, and the size and the distance of the two lines of small holes are designed according to the structure of the big valve core, so that the opening and closing size of the small holes can meet the required regeneration flow when the small valve cores with different pressures push the big valve core.
Preferably, a second O-shaped sealing ring matched with the valve sleeve is arranged outside the plug.
Preferably, the pressure equalizing groove is formed in the outer circle of the large valve core, so that the large valve core can be automatically centered when moving, the outer circle of the large valve core and the inner hole of the valve sleeve are in clearance fit, and the outer circle surface of the large valve core has strict and precise cylindricity of 0.005 and roughness of Ra0.8, so that the moving flexibility of the large valve core is jointly guaranteed, and the blocking phenomenon is avoided.
Preferably, the small valve sleeve is externally provided with an O-shaped ring groove and a retaining ring groove, and a clearance fit with the large valve sleeve is formed through a third O-shaped sealing ring and a retaining ring, wherein the third O-shaped sealing ring and the retaining ring have sealing performance.
The small valve core is arranged in the small valve sleeve in a clearance fit mode, when the excavator carries out excavating operation, hydraulic oil pumped out from the excavator is supplied to one side of the large cavity of the oil cylinder through the high-pressure passage, return oil on the side of the small cavity passes through the passage I and the passage II from the passage I, however, the large valve core limits the size of an opening from the passage I to the passage II, and therefore the pressure of the large valve core rises. When the pressure is larger than a certain condition (the pressure of a spring of the regeneration one-way valve), the return oil at the small cavity side pushes away the regeneration one-way valve of the main valve body, and flows into the large cavity side to be regenerated.
Wherein, if the pressure on the large chamber side is high, the regeneration check valve is in a closed state. The hydraulic oil on the large cavity side acts on the small valve core of the regeneration valve and flows into the regeneration valve through the port P, when the oil pressure is larger than the pressure set by the spring supported on the excircle end face of the large valve core, the large valve core is pushed by the small valve core to move towards the left side, the opening of the passage II is enlarged, and the return oil on the small cavity side is directly discharged out of the oil tank passage through the port T.
The utility model has the advantages of compact and simple structure, good sealing performance and small occupied space, the regeneration valve can control the flow rate of return oil regeneration according to the pressure of the hydraulic oil of the system, and the phenomena of ' suction and ' creeping ' and the like caused by insufficient flow supply at one side of the large cavity of the oil cylinder under the action of the self weight of the small arm are avoided. The regeneration valve of the utility model ensures the stability and safety of the hydraulic system of the excavator and improves the coordination of the actions of the excavator, thereby prolonging the service life of the control valve and improving the working efficiency of the excavator.
Drawings
Fig. 1 is a schematic structural diagram of a self-adjusting regeneration valve for a main valve of a hydraulic excavator provided by the utility model.
Detailed Description
In order to make the utility model more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings.
Examples
The embodiment provides a self-adjusting regeneration valve for a main valve of a hydraulic excavator, which comprises a large valve sleeve 3, wherein the large valve sleeve 3 is fixed on a main valve body in a matched mode through threads, an O-shaped sealing ring 6 which is installed in a matched and sealed mode is selected according to the size in an O-shaped ring groove structure on the outer circle of the large valve sleeve 3, the valve sleeve can be ensured to be fastened and completely sealed, two rows of small holes which are uniformly distributed are formed in the outer circle of the large valve sleeve 3, and the opening and closing sizes of the small holes can meet the required regeneration flow when the small valve core 8 pushes the large valve core 7 under different pressures; the front end of big valve barrel 3, by plug 1 through screw thread and O shape sealing washer 2 sealed fixed connection, spring holder 4 hugs closely in 1 terminal surface of plug, big case 7 is located in valve barrel 3, spring 5 installs on spring holder 4, and support at 7 excircle terminal surfaces of big case, 3 right-hand members of big valve barrel are located to little case 11 and spacing with its terminal surface, the outer disc of little case 11 is equipped with the structure in O shape circle groove and fender circle groove, form the clearance fit that has sealing performance through O shape sealing washer 9 and buffer ring 10 and big valve barrel 3, little case 8 is arranged in little valve barrel 11 through preferred clearance fit, receive to promote big case 7 to remove under the effect of hydraulic oil pressure at little case 8.
The working process of the utility model is as follows:
when the excavator carries out excavation operation, hydraulic oil pumped out from the pump is supplied to one side of a large cavity of the oil cylinder through the high-pressure passage, return oil at the side of a small cavity passes through the passage I from the passage II, the moving stroke of the large valve core determines the opening size of the passage I to the passage II, and the large valve core limits the opening degree of the passage II at the moment, so that the pressure of the large valve core rises. When the pressure is higher than a certain condition (the pressure of a spring of the regeneration one-way valve), the return oil at the small cavity side pushes away the regeneration one-way valve of the main valve body and flows into the large cavity side to be regenerated; if the pressure on the large chamber side is high, the regeneration check valve is in a closed state. The hydraulic oil on the large cavity side acts on the small valve core, flows into the regeneration valve through the port P, the small valve core starts to move, when the oil pressure is larger than the pressure set by the spring supported on the excircle end face of the large valve core, the large valve core is pushed by the small valve core to move towards the left side, the opening of the passage II is enlarged, and the return oil on the small cavity side directly flows out of the oil tank passage through the port T. The regeneration valve ensures the stability and safety of the hydraulic system of the excavator and improves the coordination of the actions of the excavator, thereby prolonging the service life of the control valve and improving the working efficiency of the excavator.
The utility model has the advantages of compact and simple structure, good sealing performance and small occupied space, the regeneration valve can control the flow of return oil regeneration according to the pressure of the hydraulic oil of the system, when the pressure of the hydraulic oil is greater than the pressure of a spring of the regeneration one-way valve, the return oil at the small cavity side can push away the regeneration one-way valve of the main valve body, and the return oil flows into the large cavity side to be regenerated, thereby avoiding the phenomena of 'air suction' and 'crawling' and the like caused by insufficient flow supply at one side of the large cavity of the oil cylinder under the action of the self weight of the small arm. The regeneration valve of the utility model ensures the stability and safety of the hydraulic system of the excavator and improves the coordination of the actions of the excavator, thereby prolonging the service life of the control valve and improving the working efficiency of the excavator.
Claims (4)
1. Hydraulic pressure excavator main valve is with self-interacting regeneration valve, its characterized in that: the large valve sleeve is fixed on a main valve body in a threaded fit mode, a plug is arranged at the front end of the large valve sleeve and is fixedly connected with the large valve sleeve in a sealing mode through threads and a sealing ring, and a spring seat, a spring, a large valve core and a small valve core are sequentially arranged in the large valve sleeve and behind the plug; the rear end of the large valve sleeve is provided with a small valve sleeve, the small valve sleeve is arranged at the rear end of the large valve sleeve and limited by the end surface of the small valve sleeve, and the outer circular surface of the small valve sleeve and the large valve sleeve form clearance fit with sealing performance; the small valve core is positioned in the small valve sleeve and is in clearance fit with the small valve sleeve, and the small valve core pushes the large valve core to move forwards under the action of the pressure of hydraulic oil.
2. A self-adjusting regeneration valve for a hydraulic excavator main valve as defined in claim 1 wherein: two lines of small holes are uniformly distributed in the outer circle of the large valve sleeve.
3. A self-adjusting regeneration valve for a hydraulic excavator main valve as defined in claim 2 wherein: the outer circle of the big valve core is provided with a pressure equalizing groove, so that the big valve core can be automatically centered when moving, the outer circle of the big valve core and the inner hole of the big valve sleeve adopt a clearance fit mode, and the outer circle surface requires 0.005 of cylindricity and 0.8 of roughness.
4. A self-adjusting regeneration valve for a hydraulic excavator main valve as defined in claim 3 wherein: the small valve sleeve is externally provided with an O-shaped ring groove and a retaining ring groove, and the O-shaped sealing ring and the retaining ring are in clearance fit with the large valve sleeve with sealing performance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120089861.7U CN215672935U (en) | 2021-01-13 | 2021-01-13 | Self-adjusting regeneration valve for main valve of hydraulic excavator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120089861.7U CN215672935U (en) | 2021-01-13 | 2021-01-13 | Self-adjusting regeneration valve for main valve of hydraulic excavator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215672935U true CN215672935U (en) | 2022-01-28 |
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ID=79950067
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120089861.7U Active CN215672935U (en) | 2021-01-13 | 2021-01-13 | Self-adjusting regeneration valve for main valve of hydraulic excavator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215672935U (en) |
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2021
- 2021-01-13 CN CN202120089861.7U patent/CN215672935U/en active Active
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