CN110778553B - Load holding valve for engineering machinery oil cylinder - Google Patents
Load holding valve for engineering machinery oil cylinder Download PDFInfo
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- CN110778553B CN110778553B CN201911073233.3A CN201911073233A CN110778553B CN 110778553 B CN110778553 B CN 110778553B CN 201911073233 A CN201911073233 A CN 201911073233A CN 110778553 B CN110778553 B CN 110778553B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/01—Locking-valves or other detent i.e. load-holding devices
Abstract
The invention relates to a load holding valve for an engineering machinery oil cylinder, which comprises a valve sleeve, wherein a first oil port and a second oil port are arranged in the valve sleeve; the screw sleeve is in threaded connection with the upper end of the valve sleeve; the valve seat is fixedly connected in the valve sleeve; the one-way valve core is arranged in the valve sleeve in a sliding mode and is provided with an inner conical surface which forms linear sealing with the lower end surface of the valve seat; the adjusting rod is in threaded connection with the screw sleeve; the control valve core is arranged in the valve seat in a sliding manner; the spring is controlled. The load retaining valve for the engineering machinery oil cylinder has the advantages of simple structure, compact volume, convenience in integration and long service life.
Description
Technical Field
The invention belongs to the technical field of engineering machinery, and particularly relates to a load holding valve for an oil cylinder of the engineering machinery.
Background
In the field of construction machines and construction machines, many devices such as excavators, loaders, double-ended excavators, and the like are loaded by cylinders, and thus the cylinders are required to have a load holding function. However, the action control of the oil cylinder is mainly based on the valve, and the valve usually has the problem of oil leakage in operation, so that when the oil cylinder bears heavier weight, the leakage of the oil cylinder is increased, and the load holding performance in the operation process is poorer.
In order to solve the problem that the load holding performance of the oil cylinder is influenced by the leakage of the valve, load holding valves with different structural forms are respectively disclosed in the Chinese patent with the application number of 201510193345.8 and the name of a load holding valve and the Chinese patent with the application number of 201910145299.2 and the name of a load holding valve, so that the leakage problem of the valve in the work process is solved.
However, the load holding valves disclosed in the above two patents have the following technical problems: 1. all the valve bodies are of plate type valve structures, so that the valve bodies are fixedly arranged on the bracket by screws in actual use, and are connected with the oil cylinder and the multi-way reversing valve through pipelines and cannot be directly integrated on the oil cylinder, so that the valve bodies occupy larger installation space and are complex to install; 2. when the oil cylinder is controlled to ascend and descend, the load retaining valves disclosed in the two patents are realized by controlling repeated opening and closing actions of one valve core, and the actions and the manipulations of the engineering machinery are frequent, so that the opening and closing times of the corresponding valve core are increased, the abrasion of the valve core is aggravated, the sealing is not tight, the leakage is generated, and the service life of the whole valve is finally shortened.
Disclosure of Invention
The invention aims to solve the technical problem of providing the load retaining valve for the oil cylinder of the engineering machinery, which has the advantages of simple structure, compact volume, convenient integration and long service life.
The technical scheme adopted by the invention for solving the technical problems is as follows: a load holding valve for an engineering machinery oil cylinder is characterized in that: the valve sleeve comprises a valve sleeve, a valve sleeve through hole which penetrates through the valve sleeve along the axial direction is arranged in the valve sleeve, the valve sleeve through hole comprises a first valve sleeve through hole section, a second valve sleeve through hole section and a third valve sleeve through hole section from top to bottom, a control oil port X which is communicated with the first valve sleeve through hole section and a first oil port which is communicated with the third valve sleeve through hole section are arranged on the side wall of the valve sleeve, and a second oil port is formed by a lower opening of the third valve sleeve through hole section;
the screw sleeve is in threaded connection with the upper end of the valve sleeve so as to seal an upper opening of the valve sleeve through hole, a screw sleeve through hole penetrating along the axial direction is formed in the screw sleeve, the screw sleeve through hole comprises a first screw sleeve through hole section, a second screw sleeve through hole section and a third screw sleeve through hole section from top to bottom, and an oil return port communicated with the second screw sleeve through hole section is formed in the side wall of the screw sleeve;
the valve seat comprises a main body section and a reducing section from top to bottom, the main body section is fixedly arranged in the first valve sleeve through hole section, the reducing section penetrates through the second valve sleeve through hole section and then extends into the third valve sleeve through hole section, a valve seat through hole penetrating along the axial direction is formed in the valve seat, and the valve seat through hole comprises a first valve seat through hole section, a second valve seat through hole section and a third valve seat through hole section from top to bottom;
the check valve core is arranged in the third valve sleeve through hole section in a vertically sliding manner, a check valve core through hole penetrating along the axial direction is formed in the check valve core, and the upper end of the check valve core through hole is provided with an inner conical surface matched with the lower end surface of the reducing section to control the on-off of the first oil port and the second oil port;
the upper end of the adjusting rod is in threaded connection with the first thread sleeve through hole section and extends out of the upper part of the thread sleeve, and the lower end of the adjusting rod is matched in the second thread sleeve through hole section;
the control valve core comprises a convex shoulder section and a cylindrical section from top to bottom, the lower end of the cylindrical section is provided with an external conical surface, the convex shoulder section can be arranged in the first valve seat through hole section in a vertically sliding mode, the cylindrical section is in sliding fit in the second valve seat through hole section, the external conical surface is matched with an upper opening of the third valve seat through hole section to control the connection and disconnection of the first oil port and the second oil port, a control cavity is formed between the lower end face of the convex shoulder section and the bottom face of the first valve seat through hole section, and the control cavity is communicated with the control oil port X;
and one end of the control spring is abutted against the lower end face of the adjusting rod, and the other end of the control spring is abutted against the upper end face of the convex shoulder section, so that the control valve core keeps the trend of moving downwards.
Preferably, the check valve further comprises a one-way spring and a clamping piece, the clamping piece is arranged on the side wall of the through hole section of the third valve sleeve, the one-way spring is arranged in the through hole section of the third valve sleeve, one end of the one-way spring abuts against the clamping piece, the other end of the one-way spring abuts against the one-way valve core, and the one-way valve core is enabled to keep moving upwards to block the trend that the first oil port is communicated with the second oil port.
Preferably, an annular first through flow groove communicated with the control oil port is formed in the side wall of the main body section, and a first through flow hole used for communicating the first through flow groove with the control cavity is formed in the main body section.
Preferably, the lower end of the through hole section of the second valve seat is provided with an annular second flow through groove, and the side wall of the valve seat is provided with a second flow through hole for communicating the second flow through groove with the through hole section of the third valve sleeve.
Compared with the prior art, the invention has the advantages that:
1. the invention is a thread cartridge type structure, has more compact structure volume, is convenient to install and use, can be directly integrated on the oil cylinder, and saves the requirement of the existing plate type valve on an installation support, thereby reducing the installation space requirement, facilitating pipeline connection and improving the use flexibility of the load maintaining valve.
2. In the invention, the control valve core and the valve seat are matched to replace the one-way valve core and the valve seat to control the on-off of the oil path between the oil inlet and the oil outlet when the load descends, so that the one-way valve core for controlling the direct on-off of the oil path between the oil inlet and the oil outlet is opened and closed only once in the whole process of the ascending and descending of the load.
Drawings
FIG. 1 is a cross-sectional view of an embodiment of the present invention;
FIG. 2 is a schematic view of a thread insert according to an embodiment of the present invention;
fig. 3 is a schematic view of the structure of a valve sleeve in an embodiment of the invention;
FIG. 4 is a schematic view of a valve seat structure according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a control valve core in the embodiment of the invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
As shown in fig. 1-5, is a preferred embodiment of the present invention.
A load holding valve for an oil cylinder of an engineering machine comprises
The valve sleeve 2 is provided with a valve sleeve through hole which penetrates along the axial direction in the valve sleeve 2, the valve sleeve through hole comprises a first valve sleeve through hole section 201, a second valve sleeve through hole section 202 and a third valve sleeve through hole section 203 from top to bottom, a control oil port X communicated with the first valve sleeve through hole section 201 and a first oil port A communicated with the third valve sleeve through hole section 203 are arranged on the side wall of the valve sleeve 2, and a lower opening of the third valve sleeve through hole section 203 forms a second oil port B.
The thread insert 1 is in threaded connection with the upper end of the valve sleeve 2, the thread insert 1 is connected with the upper end of the valve sleeve 2 to seal an upper opening of a through hole of the valve sleeve, a thread insert through hole penetrating along the axial direction is arranged in the thread insert 1, the thread insert through hole comprises a first thread insert through hole section 101, a second thread insert through hole section 102 and a third thread insert through hole section 103 from top to bottom, and an oil return port T communicated with the second thread insert through hole section 102 is arranged on the side wall of the thread insert 1.
The valve seat 3, the valve seat 3 includes main body section 3a and reducing section 3b from top to bottom, the main body section 3a is fixed to be established in first valve barrel through-hole section 201, reducing section 3b stretches into in the third valve barrel through-hole section 203 after passing second valve barrel through-hole section 202, be equipped with the valve seat through-hole that runs through along the axial in the valve seat 3, the valve seat through-hole includes first valve seat through-hole section 301 from top to bottom, second valve seat through-hole section 302 and third valve seat through-hole section 303, the lower extreme of second valve seat through-hole section 302 is equipped with annular second through-hole groove 304, be equipped with the second through-hole 305 that is used for communicating second through-hole groove 304 and third valve barrel through-hole section 203 on the lateral wall of valve seat 3.
The check valve core 4 is arranged in the third valve sleeve through hole section 203 in a vertically sliding manner, a check valve core through hole 41 penetrating along the axial direction is arranged in the check valve core 4, and an inner conical surface 42 matched with the lower end surface of the reducing section 3B to control the connection and disconnection of the first oil port A and the second oil port B is arranged at the upper end of the check valve core through hole 41.
One-way spring 6B and card 8, card 8 are established on the lateral wall of third valve cover through-hole section 203, and one-way spring 6B is established in third valve cover through-hole section 203, and one end of one-way spring 6B supports on card 8, and the other end supports on check valve core 4, makes check valve core 4 keep moving upwards in order to cut off the trend that first hydraulic fluid port A and second hydraulic fluid port B communicate.
And the upper end of the adjusting rod 9 is in threaded connection with the first thread sleeve through hole section 101 and extends out of the upper part of the thread sleeve 1, and the lower end of the adjusting rod 9 is matched in the second thread sleeve through hole section 102.
The control valve core 5 comprises a convex shoulder section 51 and a cylindrical section 52 from top to bottom, the lower end of the cylindrical section 52 is provided with an external conical surface 53, the convex shoulder section 51 can be arranged in the first valve seat through hole section 301 in a vertically sliding manner, the cylindrical section 52 is matched in the second valve seat through hole section 302 in a sliding manner, the external conical surface 53 is matched with an upper opening of the third valve seat through hole section 303 to control the connection and disconnection of a first oil port A and a second oil port B, a control cavity 3a1 is formed between the lower end surface of the convex shoulder section 51 and the bottom surface of the first valve seat through hole section 301, and the control cavity 3a1 is communicated with a control oil port X; an annular first through flow groove 306 communicated with the control oil port X is formed in the side wall of the main body section 3a, and a first through flow hole 307 for communicating the first through flow groove 306 with the control cavity 3a1 is formed in the main body section 3 a.
And the control spring 6a is arranged in the second thread sleeve through hole section 102, one end of the control spring 6a abuts against the lower end face of the adjusting rod 9, and the other end abuts against the upper end face of the shoulder section 51, so that the control valve core 5 keeps the trend of moving downwards.
The working principle and the process of the invention are as follows:
when the multi-way reversing valve is used, the multi-way reversing valve is directly in threaded connection in an inserting hole of an oil cylinder of engineering machinery, a second oil port B is communicated with a piston cavity of the oil cylinder, a first oil port A is communicated with a working oil port of the multi-way reversing valve, a control oil port X is communicated with control oil, and an oil return port T is communicated with an oil tank.
Load raising function: when the load is controlled to rise, oil at the outlet of the multi-way reversing valve flows into the third valve sleeve through hole section 203 through the first oil port A and acts on the upper surface of the one-way valve core 4, the acting force of the one-way spring 6B on the one-way valve core 4 is overcome, the one-way valve core 4 is pushed to move downwards, the inner conical surface 42 of the one-way valve core 4 is separated from the valve seat 3, the first oil port A is communicated with the second oil port B, the oil directly enters the second oil port B from the first oil port A and acts on a piston cavity of the oil cylinder, and the oil cylinder is pushed to extend to enable the load to rise. In the process, the control valve core 5 is kept in a closed state to the third seat through hole section 303 in the valve seat 3 by the control spring 6 a.
Load holding function: when the oil cylinder is required to stop, the multi-way reversing valve stops oil supply, the one-way valve core 4 moves upwards under the action of oil pressure at the second oil port B and the one-way spring 6B, the inner conical surface 42 of the one-way valve core 4 is attached to the lower end surface of the valve seat 3 again to form linear sealing, and no leakage is kept; meanwhile, under the action of the control spring 6a, the outer conical surface 53 of the control valve core 5 and the upper opening of the third valve seat through hole section 303 form linear sealing, so that no leakage is kept; thereby, a leak-free load holding function is realized.
A load-dropping function: when the load is required to be controlled to be lowered, the control oil is introduced into the control cavity 3a1 through the control oil port X and is used on the control valve core 5, the acting force of the control spring 6a is overcome, the control valve core 5 is pushed to move upwards, the third valve seat through hole section 303 is opened, the oil of the second oil port B flows into the first oil port A through the third valve seat through hole section 303, the pressure of the control oil port X is larger, the upward movement distance of the control valve core 5 is larger, the opening of the third valve seat through hole section 303 is also larger, the oil flow flowing from the second oil port B to the first oil port A can be controlled through the pressure of the control oil port X, the lowering speed of the load is further controlled, and the micro-motion function is realized.
Claims (4)
1. A load holding valve for an engineering machinery oil cylinder is characterized in that: comprises that
The valve sleeve comprises a valve sleeve (2), wherein a valve sleeve through hole penetrating along the axial direction is formed in the valve sleeve (2), the valve sleeve through hole comprises a first valve sleeve through hole section (201), a second valve sleeve through hole section (202) and a third valve sleeve through hole section (203) from top to bottom, a control oil port (X) communicated with the first valve sleeve through hole section (201) and a first oil port (A) communicated with the third valve sleeve through hole section (203) are formed in the side wall of the valve sleeve (2), and a second oil port (B) is formed by a lower opening of the third valve sleeve through hole section (203);
the valve sleeve comprises a threaded sleeve (1), wherein the threaded sleeve (1) is in threaded connection with the upper end of a valve sleeve (2) so as to seal an upper opening of a through hole of the valve sleeve, a threaded sleeve through hole penetrating along the axial direction is formed in the threaded sleeve (1), the threaded sleeve through hole comprises a first threaded sleeve through hole section (101), a second threaded sleeve through hole section (102) and a third threaded sleeve through hole section (103) from top to bottom, and an oil return port (T) communicated with the second threaded sleeve through hole section (102) is formed in the side wall of the threaded sleeve (1);
the valve seat (3), the valve seat (3) comprises a main body section (3a) and a reducing section (3b) from top to bottom, the main body section (3a) is fixedly arranged in the first valve sleeve through hole section (201), the reducing section (3b) penetrates through the second valve sleeve through hole section (202) and then extends into the third valve sleeve through hole section (203), a valve seat through hole penetrating along the axial direction is formed in the valve seat (3), and the valve seat through hole comprises a first valve seat through hole section (301), a second valve seat through hole section (302) and a third valve seat through hole section (303) from top to bottom;
the check valve core (4) is arranged in the third valve sleeve through hole section (203) in a vertically sliding mode, a check valve core through hole (41) penetrating along the axial direction is formed in the check valve core (4), and an inner conical surface (42) matched with the lower end face of the reducing section (3B) to control the connection and disconnection of the first oil port (A) and the second oil port (B) is arranged at the upper end of the check valve core through hole (41);
the upper end of the adjusting rod (9) is in threaded connection with the first thread sleeve through hole section (101) and extends out of the upper portion of the thread sleeve (1), and the lower end of the adjusting rod (9) is matched in the second thread sleeve through hole section (102);
the control valve core (5) comprises a convex shoulder section (51) and a cylindrical section (52) from top to bottom, the lower end of the cylindrical section (52) is provided with an outer conical surface (53), the convex shoulder section (51) can be arranged in the first valve seat through hole section (301) in a vertically sliding mode, the cylindrical section (52) is in sliding fit in the second valve seat through hole section (302), the outer conical surface (53) is matched with an upper opening of the third valve seat through hole section (303) to control the connection and disconnection of the first oil port (A) and the second oil port (B), a control cavity (3a1) is formed between the lower end surface of the convex shoulder section (51) and the bottom surface of the first valve seat through hole section (301), and the control cavity (3a1) is communicated with the control oil port (X);
and the control spring (6a) is arranged in the second thread sleeve through hole section (102), one end of the control spring (6a) abuts against the lower end face of the adjusting rod (9), and the other end of the control spring (6a) abuts against the upper end face of the shoulder section (51), so that the control valve core (5) keeps the trend of moving downwards.
2. The load maintaining valve for a cylinder of construction machinery according to claim 1, wherein: still include one-way spring (6B) and card (8), card (8) are established on the lateral wall of third valve cover through-hole section (203), and one-way spring (6B) are established in third valve cover through-hole section (203), and one end of one-way spring (6B) supports on card (8), and the other end supports on one-way valve core (4), makes one-way valve core (4) keep the trend of rebound in order to cut off first hydraulic fluid port (A) and second hydraulic fluid port (B) intercommunication.
3. The load maintaining valve for a cylinder of construction machinery according to claim 1, wherein: the side wall of the main body section (3a) is provided with an annular first through flow groove (306) communicated with the control oil port (X), and a first through flow hole (307) used for communicating the first through flow groove (306) with the control cavity (3a1) is arranged in the main body section (3 a).
4. The load maintaining valve for a cylinder of construction machinery according to claim 1, wherein: the lower end of the second valve seat through hole section (302) is provided with an annular second through hole (304), and the side wall of the valve seat (3) is provided with a second through hole (305) for communicating the second through hole (304) with the third valve sleeve through hole section (203).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911073233.3A CN110778553B (en) | 2019-11-05 | 2019-11-05 | Load holding valve for engineering machinery oil cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911073233.3A CN110778553B (en) | 2019-11-05 | 2019-11-05 | Load holding valve for engineering machinery oil cylinder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110778553A CN110778553A (en) | 2020-02-11 |
| CN110778553B true CN110778553B (en) | 2021-07-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911073233.3A Active CN110778553B (en) | 2019-11-05 | 2019-11-05 | Load holding valve for engineering machinery oil cylinder |
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| Country | Link |
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| CN (1) | CN110778553B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5738142A (en) * | 1996-08-09 | 1998-04-14 | Case Corporation | Pressure holding directional control valve |
| CN101634317A (en) * | 2009-08-21 | 2010-01-27 | 宁波汉商液压有限公司 | Plug-in type balance valve |
| CN104220798A (en) * | 2012-03-27 | 2014-12-17 | 萱场工业株式会社 | Fluid pressure control device |
| CN104806594A (en) * | 2015-04-23 | 2015-07-29 | 圣邦集团有限公司 | Multi-way valve with oil cylinder load holding function |
| CN109844325A (en) * | 2016-10-13 | 2019-06-04 | Hydac流体技术有限公司 | The gentle lifting device with this discharge pressure balance in discharge pressure day |
-
2019
- 2019-11-05 CN CN201911073233.3A patent/CN110778553B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5738142A (en) * | 1996-08-09 | 1998-04-14 | Case Corporation | Pressure holding directional control valve |
| CN101634317A (en) * | 2009-08-21 | 2010-01-27 | 宁波汉商液压有限公司 | Plug-in type balance valve |
| CN104220798A (en) * | 2012-03-27 | 2014-12-17 | 萱场工业株式会社 | Fluid pressure control device |
| CN104806594A (en) * | 2015-04-23 | 2015-07-29 | 圣邦集团有限公司 | Multi-way valve with oil cylinder load holding function |
| CN109844325A (en) * | 2016-10-13 | 2019-06-04 | Hydac流体技术有限公司 | The gentle lifting device with this discharge pressure balance in discharge pressure day |
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| Publication number | Publication date |
|---|---|
| CN110778553A (en) | 2020-02-11 |
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Effective date of registration: 20210618 Address after: 276000 at the junction of national highway 205 and BEICI road in Linyi Economic Development Zone, Shandong Province Applicant after: Shandong Jinli Hydraulic Technology Co.,Ltd. Address before: 252300 West unit 402, building 2, xinyuanyuan community, Yanggu County, Liaocheng City, Shandong Province Applicant before: Wu Fang |
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