CN109162975B - Reversing valve plate with jumping and pressure maintaining functions for agricultural machinery - Google Patents
Reversing valve plate with jumping and pressure maintaining functions for agricultural machinery Download PDFInfo
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- CN109162975B CN109162975B CN201811094795.1A CN201811094795A CN109162975B CN 109162975 B CN109162975 B CN 109162975B CN 201811094795 A CN201811094795 A CN 201811094795A CN 109162975 B CN109162975 B CN 109162975B
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- 230000009191 jumping Effects 0.000 title claims description 11
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 43
- 239000010959 steel Substances 0.000 claims abstract description 43
- 239000003921 oil Substances 0.000 claims description 60
- 238000004891 communication Methods 0.000 claims description 18
- 230000007246 mechanism Effects 0.000 claims description 13
- 230000007704 transition Effects 0.000 claims description 12
- 230000009471 action Effects 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 5
- 239000010720 hydraulic oil Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 5
- 230000001105 regulatory effect Effects 0.000 description 6
- 238000009434 installation Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Classifications
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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
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
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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
- F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
-
- 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
- F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
- F15B20/004—Fluid pressure supply failure
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Preventing Unauthorised Actuation Of Valves (AREA)
- Lift Valve (AREA)
Abstract
The application discloses a reversing valve plate with skip position and pressure maintaining functions for an agricultural machine, which comprises a valve body, a valve rod skip position structure, a pilot hydraulic lock arranged in an inserting cavity where a working port of the valve body is located, wherein the pilot hydraulic lock comprises a screw plug, a valve sleeve screwed with the screw plug, a reset spring, a main valve core and a steel ball which are sequentially arranged in an inner cavity of the valve sleeve, and also comprises an adjusting screw, a pilot spring and a pilot valve core which are sequentially arranged in the inner cavity of the main valve core, wherein the adjusting screw is provided with a guide hole, the guide hole is communicated with a cavity at the top of the main valve core and the inner cavity of the main valve core, after the reversing valve plate is reversed, the valve rod pushes the steel ball, and the steel ball pushes the pilot valve core before the main valve core, so that pressure release of the working port is realized. The pilot valve core is added in the main valve core of the hydraulic lock of the reversing valve plate, so that the leakage-proof effect is remarkable during pressure maintaining, and the differential unlocking function can be realized.
Description
Technical Field
The application relates to a reversing valve plate with jumping and pressure maintaining functions for an agricultural machine.
Background
The split type hydraulic combination valve is widely applied to a hydraulic system of an agricultural machine, and functional valve plates such as an oil inlet valve plate, each linkage reversing valve plate, an oil return valve plate and the like are assembled together by bolts, so that different multi-way valves can be assembled according to different use requirements, and the universality is high.
The jump function of the reversing valve plate is that when the pressure of the working port reaches a set value after the valve rod is reversed, the valve rod can automatically return to the middle position, so that damage caused by overlarge pressure of the oil cylinder is prevented, the jump function is disclosed in a Chinese patent document CN106930994B, and the jump structure sealing element is used in a large quantity in order to ensure that the pressure regulating operation hole of the front end cover is not leaked with oil.
The pressure maintaining function of the reversing valve plate is to maintain the pressure of the oil cylinder by utilizing the hydraulic lock, so that the oil cylinder is prevented from sliding downwards, and the function of locking the oil cylinder is achieved. The check valve in the existing hydraulic lock is reset by means of a spring, and when the pressure of an oil cylinder connected with a working port is too high, the hydraulic lock can be opened, and the oil cylinder cannot be prevented from leakage.
Disclosure of Invention
The application aims to provide a reversing valve plate with a jump structure and a pilot hydraulic lock, which is used on an agricultural machine.
The application provides a reversing valve plate with a skip function and a pressure maintaining function for an agricultural machine, which comprises a valve body, a valve rod skip structure, a pilot hydraulic lock arranged in an inserting cavity where a working port of the valve body is located, wherein the pilot hydraulic lock comprises a screw plug, a valve sleeve screwed with the screw plug, a return spring, a main valve core and a steel ball which are sequentially arranged in an inner cavity of the valve sleeve, wherein the steel ball is kept in the valve sleeve and is positioned at the lower part of the main valve core, one part of the steel ball extends out of the bottom end surface of the valve sleeve and is suitable for being abutted with a neck part of the valve rod of the reversing valve plate, the pilot hydraulic lock further comprises an adjusting screw, a pilot spring and a pilot valve core which are sequentially arranged in the inner cavity of the main valve core, a guide hole is formed in the adjusting screw, the guide hole is communicated with a cavity at the top of the main valve core, and the inner cavity of the main valve core, after the reversing valve plate is reversed, the steel ball is pushed by the valve rod, and the pilot valve core is pushed by the steel ball before the main valve core is pushed by the main valve core, and pressure release of the working port is realized.
Further, the screw plug is provided with a valve sleeve connecting part, a first communication hole is formed in the cavity wall of the valve sleeve connecting part, a second communication hole is formed in the cavity wall of the upper cavity of the valve sleeve, and the first communication hole and the second communication hole are communicated through a communication cavity formed in the valve body.
Further, a third communication hole is arranged on the cavity wall of the lower cavity of the valve sleeve and is communicated with an oil inlet channel where the neck part of the valve rod is positioned.
Further, a steel ball holding groove is formed at the lower end of the main valve element.
Further, the pilot spool has a guide rod contacting the steel ball.
Further, the valve rod jump structure comprises: the valve rod jump section is provided with a stepped hole extending along the axial direction of the valve rod, a valve port arranged on the bottom surface of the stepped hole and a steel ball through hole formed on the wall of the stepped hole, wherein the valve port is connected with an oil guide channel in the valve rod, and the oil guide channel is communicated with the working oil port after the valve rod is changed; the positioning sleeve is sleeved on the valve rod jump bit section, a groove is formed in the inner wall of the positioning sleeve, a cone valve, a first spring, a positioning guide seat, a positioning push rod, a second spring and an elastic reset mechanism of the valve rod are sequentially arranged in the valve rod stepped hole along the axial direction, the end screw is in threaded connection with the stepped hole of the valve rod, the head of the positioning push rod forms a slope, the steel ball is clamped into the groove of the positioning sleeve after the valve rod is reversed, the reset spring is compressed, a hole on the valve rod is communicated with the working oil port, the cone valve is jacked up after the pressure of the working oil port reaches a set value, the hydraulic oil pushes the positioning guide seat to move, the positioning push rod is pushed to move, the steel ball is unlocked to lock the positioning sleeve, and the valve rod returns to the initial position under the action of the elastic reset mechanism to finish jump bit action.
Further, the elastic return mechanism includes a third spring, a front spring seat positioned on the end screw, and a rear spring seat positioned at an end of the valve stem.
Further, the valve rod jump position structure further comprises an adjusting mechanism, the adjusting mechanism comprises a pressure adjusting set screw, a limiting seat, a guide rod and a spring guide seat, wherein the pressure adjusting set screw and the limiting seat are arranged in the end screw, the guide rod penetrates through the positioning push rod, the spring guide seat is arranged in an inner cavity of the positioning guide seat, and the spring guide seat is in butt joint with one end of the first spring.
Further, the reversing valve plate further comprises a transition sleeve fixedly connected with the valve body and a front cover connected with the transition sleeve, and the transition sleeve and the front cover form an installation cavity, wherein the valve rod jump structure is arranged in the installation cavity.
Further, the transition sleeve is provided with a positioning structure for axially positioning the positioning sleeve.
According to the reversing valve plate, after the oil cylinder moves to a required position after reversing, the pressure rises, the valve rod jumps to the middle position after the set pressure of 'jumping' is reached, the pilot valve core and the main valve core of the hydraulic lock are closed under the pressure of the oil cylinder, the pressure of the oil cylinder is maintained, the oil cylinder is prevented from sliding downwards, and the function of 'locking' the oil cylinder is achieved. When the oil cylinder does not need pressure maintaining, the valve rod is reversed, the steel ball pushes the pilot valve core to move, the pressure in the working cavity is released through the hole in the adjusting screw, and the unlocking resistance is reduced.
According to the reversing valve plate, the main valve core of the hydraulic lock is reset and locked under the pressure of the oil cylinder, the main valve core is pressed more tightly under the pressure effect, the leakage prevention effect is better, and the oil cylinder can be ensured not to leak under the condition that the pressure of the oil cylinder is increased. The pilot valve core is added in the main valve core of the hydraulic lock, and the pressure of the working oil port is relieved through the hole on the adjusting screw, so that the differential unlocking function is realized.
In addition to the objects, features and advantages described above, the present application has other objects, features and advantages. The present application will be described in further detail with reference to the drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:
FIG. 1 is a schematic illustration of a reversing valve plate with a trip structure and a pilot operated hydraulic lock for use on an agricultural machine in accordance with the present application;
FIG. 2 is a schematic structural view of a jump bit structure of a reversing valve plate according to the present application; and
fig. 3 is a schematic structural view of a pilot operated hydraulic lock of a reversing valve plate according to the present application.
Detailed Description
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
As shown in fig. 1, the reversing valve plate of the present application includes a valve body 1, a valve rod 2, a jump bit structure 3, and a pilot hydraulic valve 5 installed in an insertion cavity where a working port B is located.
The reversing valve plate also comprises a one-way valve 4, a shifting fork 7 for operating the valve rod 2 to reverse, a bracket 6 for supporting the shifting fork 7 and other conventional components. The working port A and the working port B are oil inlet and outlet ports, oil is supplied by the oil inlet P, oil is returned by the oil return port T, and the one-way valve 4 is arranged at the outlet of the oil inlet P to the filter passage.
Referring to fig. 1 and 2 in combination, the trip structure 3 includes a positioning sleeve 33, a cone valve 34, a first spring 35, a positioning guide 36, a positioning push rod 37, a steel ball 38, a second spring 39, an end screw 40, a front spring seat 41, a third spring 42, and a rear spring seat 43.
The jump section 21 of the valve rod 2 is positioned in the positioning sleeve 33, a stepped hole 21a is arranged in the valve rod, a valve port 21c is arranged at the end part of the stepped hole, the valve port 21c is connected with the oil guide channel 2a, and the starting end of the oil guide channel 2a can be communicated with the oil inlet after the valve rod is changed.
A cone valve 34, a first spring 35, a positioning guide seat 36, a positioning push rod 37 and a second spring 39 are sequentially arranged in the valve rod stepped hole 21a along the axial direction, wherein an end screw 40 is in threaded connection with the tail end of the valve rod stepped hole 21 a.
The third spring 42, the front spring seat 41 and the rear spring seat 43 constitute an elastic restoring mechanism for restoring the valve stem to the original position, and can provide an elastic restoring force regardless of whether the valve stem is moved left or right. Wherein the front spring seat 41 is positioned on the end screw 40, the rear spring seat 43 is positioned at the end of the valve stem 2, and the third spring 42 is disposed between the front spring seat 41 and the rear spring seat 43.
The head of the positioning push rod 37 forms a slope, a steel ball through hole 21b is formed on the hole wall of the jump section 21 of the valve rod, a groove 33a is formed on the inner hole wall of the positioning sleeve 33, a part of the steel ball 38 is kept in the steel ball through hole 21b, the steel ball 38 can move outwards/inwards in the steel ball through hole 21b, the head of the positioning push rod 37 can eject the steel ball outwards when moving rightwards, and the ejected part is suitable for being accommodated by the groove 33 a.
The jump structure 3 also comprises a transition sleeve 31 fixedly connected with the valve body and a front cover 32 connected with the transition sleeve 31, and the transition sleeve 31 and the front cover form an installation cavity for arranging jump structural members. The transition sleeve 31 has a positioning structure such as a stepped hole 31a for axially positioning the positioning sleeve, so as to ensure the position stability of the positioning sleeve. Wherein the inner wall of the front cover 32 is adapted to abut the front spring seat 41.
The working process of the jump structure after the valve rod is changed is as follows:
after the valve rod 2 is changed back (working port A or working port B), the steel ball 38 is clamped into the groove 33a of the positioning sleeve 33, the third spring 42 is further compressed, the oil guide channel 2a on the valve rod is communicated with the working oil port, when the pressure of the working oil port reaches a set value, the oil pushes the cone valve 34 open, and enters between the positioning guide seat 36 and the cone valve 34, then the pressure pushes the positioning guide seat 36, when the positioning guide seat 36 moves to be in contact with the positioning push rod 37, the positioning push rod 37 is continuously pushed to move, the valve rod 2 moves in the direction opposite to the moving direction of the positioning guide seat 36 under the reset action of the third spring 42, the steel ball 38 is pushed to move towards the inside of the valve rod, and the valve rod 2 returns to the initial position under the action of the third spring 42, so that the jump action is completed.
The jump bit structure 3 further comprises a pressure regulating mechanism, the pressure regulating mechanism comprises a pressure regulating set screw 44, a limiting seat 45, a guide rod 46 and a spring guide seat 47, wherein the pressure regulating set screw 44 and the limiting seat 45 are arranged in the end screw 40, the guide rod 46 penetrates through the positioning push rod 37, the spring guide seat 47 is arranged in the inner cavity of the positioning guide seat 36, and the spring guide seat 47 is abutted with one end of the first spring 35.
When the axial position of the pressure adjusting set screw 44 is changed, the position of the spring guide 47 is changed simultaneously, and the elastic force applied to the cone valve 34 by the first spring 35 is also changed accordingly, thereby adjusting the cone valve opening pressure.
Compared with the prior art, the valve rod jump structure has the advantages that the end screw assembles scattered parts with the valve rod, when the front cover is disassembled and the set pressure of the pressure regulating mechanism is set, the jump structure can not be scattered, the valve port is sealed by adopting the cone valve structure, the use quantity of sealing elements is reduced, and the jump sensitivity is improved.
Referring to fig. 1 and 3 in combination, the pilot hydraulic lock of the present application comprises a plug screw 51, a valve sleeve 52 screwed with the plug screw, a return spring 55, a main valve core 53 and a steel ball 54 sequentially arranged in the inner cavity of the valve sleeve 52, wherein the steel ball 54 is held in the valve sleeve 52 and is positioned at the lower part of the main valve core 53, and a part of the steel ball 54 extends out of the bottom surface of the valve sleeve 52 and is suitable for abutting with the neck 22 of the valve rod 2.
An adjusting screw 56, a pilot spring 57, and a pilot valve element 58 are provided in this order in the inner cavity of main valve element 53, wherein the lower end of the guide rod of pilot valve element 58 abuts against steel ball 54. The adjusting screw 56 is provided with a hole 56a which communicates with the cavity inside the main spool.
The valve housing 52 has a first valve port 52a formed in its inner cavity, the main valve core 53 is in sealing engagement with the first valve port 52a, the cavity above the first valve port 52a of the valve housing defines an upper cavity, the upper cavity defines a first guide hole, the main valve core is in guiding engagement with the first guide hole, the cavity below the first valve port 52a of the valve housing defines a lower cavity, the lower cavity defines a second guide hole, and the steel ball holding groove 53a at the lower end of the main valve core 53 is in guiding engagement with the second guide hole.
A second port 53a is formed in the inner cavity of main spool 53, and pilot spool 58 is in sealing engagement with second port 53 a.
The screw plug 51 includes an oil port connection portion and a valve sleeve connection portion 51a, a first communication hole 51b is formed in a cavity wall of the valve sleeve connection portion 51a, a second communication hole 52b is formed in a cavity wall of an upper cavity of the valve sleeve 52, and the first communication hole and the second communication hole are communicated through a communication cavity formed in the valve body and are the same as pressure of a working port. A third communication hole 52c is provided in the wall of the lower chamber of the valve housing 52, which communicates with the oil passage in which the neck portion of the valve stem is located.
The matching process of the pilot hydraulic lock and the jump structure is as follows:
when the valve plate is changed, the neck 22 of the valve rod 2 pushes the steel ball 54, the steel ball 54 pushes the pilot valve core 58 first, then the main valve core 53 is pushed, the hydraulic lock is opened, and the oil cylinder connected with the working port moves; when the oil cylinder moves to a required position, the pressure rises, the valve rod jumps to the middle position after the set pressure of 'jumping' is reached, the pilot valve core and the main valve core of the hydraulic lock are closed under the pressure of the oil cylinder, the oil cylinder is kept pressure, the oil cylinder is prevented from sliding downwards, and the function of 'locking' the oil cylinder is achieved.
When the oil cylinder does not need pressure maintaining, the valve rod is reversed, the steel ball 54 pushes the pilot valve core to move, the pressure in the working cavity is released through the hole in the adjusting screw, after the pressure in the working cavity is reduced, the force applied to the main valve core is reduced, then the steel ball pushes the main valve core, the hydraulic lock is opened, and the oil cylinder releases pressure to realize the differential unlocking function. If the pilot valve core does not perform pressure relief action, the pressure (16-20 MPa) of the working port fully acts on the main valve core, and the valve rod is used for reversing to unlock the valve.
The pilot hydraulic lock is integrated, the valve seat and the valve sleeve are integrally connected through threads, the valve seat is connected to the oil port through threads, and if the hydraulic lock is blocked, the hydraulic lock is only required to be integrally replaced, so that maintenance steps are simplified, and maintenance time and cost are saved.
In addition, the main valve core of the hydraulic lock is reset and locked under the pressure of the oil cylinder, the main valve core is pressed more tightly under the pressure effect, the leakage prevention effect is better, and the oil cylinder can be ensured not to leak under the condition that the pressure of the oil cylinder is increased; according to the hydraulic lock disclosed by the application, the pilot valve core is added in the main valve core, and the pressure of the working oil port is relieved through the hole on the adjusting screw, so that the differential unlocking function is realized.
The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (7)
1. The reversing valve plate with the jumping and pressure maintaining functions for the agricultural machinery comprises a valve body, a valve rod and a valve rod jumping structure, and is characterized by also comprising a pilot hydraulic lock arranged in an inserting cavity where a working port of the valve body is positioned,
the pilot hydraulic lock comprises a screw plug, a valve sleeve screwed with the screw plug, a return spring, a main valve core and a steel ball which are sequentially arranged in an inner cavity of the valve sleeve, wherein the steel ball is held in the valve sleeve and positioned at the lower part of the main valve core, one part of the steel ball extends out of the bottom end surface of the valve sleeve and is suitable for being abutted with the neck part of a valve rod of a reversing valve plate, a steel ball holding groove is formed at the lower end of the main valve core, the screw plug comprises an oil port connecting part and a valve sleeve connecting part,
the pilot hydraulic lock also comprises an adjusting screw, a pilot spring and a pilot valve core which are sequentially arranged in the inner cavity of the main valve core, wherein the adjusting screw is provided with a guide hole which is communicated with a cavity at the top of the main valve core and the inner cavity of the main valve core, the pilot valve core is provided with a guide rod which is contacted with the steel ball,
a first valve port is formed in the inner cavity of the valve sleeve, the main valve core is in sealing fit with the first valve port, a cavity above the first valve port of the valve sleeve is defined as an upper cavity, the upper cavity is provided with a first guide hole, the main valve core is in guiding fit with the first guide hole, a cavity below the first valve port of the valve sleeve is defined as a lower cavity, the lower cavity is provided with a second guide hole, a steel ball retaining groove at the lower end of the main valve core is in guiding fit with the second guide hole,
wherein after the reversing valve plate is reversed, the valve rod pushes the steel ball, the steel ball pushes the pilot valve core before the main valve core, so as to realize the pressure relief of the working port,
the valve rod jump structure comprises:
the valve rod jump section is provided with a stepped hole extending along the axial direction of the valve rod, a valve port arranged on the bottom surface of the stepped hole and a steel ball through hole formed on the wall of the stepped hole, wherein the valve port is connected with an oil guide channel in the valve rod, and the oil guide channel is communicated with the working oil port after the valve rod is changed;
a positioning sleeve sleeved on the valve rod jump section and provided with a groove on the inner wall thereof, and
the cone valve, the first spring, the positioning guide seat, the positioning push rod, the second spring, the end screw connected with the stepped hole of the valve rod in a screwed manner and the elastic reset mechanism of the valve rod are sequentially arranged in the stepped hole of the valve rod along the axial direction, wherein the head part of the positioning push rod forms a slope,
after reversing, the steel ball is clamped into the groove of the positioning sleeve, the reset spring is compressed, the hole on the valve rod is communicated with the working oil port, when the pressure of the working oil port reaches a set value, the conical valve is jacked up, the hydraulic oil pushes the positioning guide seat to move, the positioning push rod is pushed to move, the steel ball is unlocked to lock the positioning sleeve, and the valve rod returns to the initial position under the action of the elastic reset mechanism, so that the jump action is completed.
2. The reversing valve plate with the jumping and pressure maintaining functions for the agricultural machinery according to claim 1, wherein a first communication hole is formed in the cavity wall of the valve sleeve connecting portion, a second communication hole is formed in the cavity wall of the upper cavity of the valve sleeve, and the first communication hole and the second communication hole are communicated through a communication cavity formed in the valve body.
3. The reversing valve plate with the jumping and pressure maintaining functions for the agricultural machinery according to claim 2, wherein a third communication hole is formed in the cavity wall of the lower cavity of the valve sleeve and is communicated with an oil inlet channel where the neck of the valve rod is located.
4. The reversing valve with trip and dwell functions for an agricultural machine of claim 1 wherein the resilient return mechanism includes a third spring, a front spring seat positioned on the end screw and a rear spring seat positioned on the end of the valve stem.
5. The reversing valve with trip and dwell functions for an agricultural machine of claim 1 wherein the valve stem trip structure further includes an adjustment mechanism including a set adjustment screw, a stop seat, a guide bar, and a spring guide, wherein the set adjustment screw and stop seat are disposed in the end screw, the guide bar extends through the positioning push bar, the spring guide is disposed in an interior cavity of the positioning guide, the spring guide is in abutment with one end of the first spring.
6. The reversing valve plate with the functions of jumping and maintaining pressure for an agricultural machine according to claim 1, further comprising a transition sleeve fixedly connected with the valve body and a front cover connected with the transition sleeve, wherein the transition sleeve and the front cover form a mounting cavity, and the valve rod jumping structure is arranged in the mounting cavity.
7. The reversing valve with trip and dwell functions for agricultural machinery of claim 6, wherein the transition sleeve has a locating structure that axially locates the locating sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811094795.1A CN109162975B (en) | 2018-09-19 | 2018-09-19 | Reversing valve plate with jumping and pressure maintaining functions for agricultural machinery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811094795.1A CN109162975B (en) | 2018-09-19 | 2018-09-19 | Reversing valve plate with jumping and pressure maintaining functions for agricultural machinery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109162975A CN109162975A (en) | 2019-01-08 |
| CN109162975B true CN109162975B (en) | 2023-10-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811094795.1A Active CN109162975B (en) | 2018-09-19 | 2018-09-19 | Reversing valve plate with jumping and pressure maintaining functions for agricultural machinery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109162975B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109707868A (en) * | 2019-01-29 | 2019-05-03 | 合肥长源液压股份有限公司 | A kind of reversal valve and valve block of the hydraulic fluid port pressure adjustable for hydraulic steering system |
| CN109779997A (en) * | 2019-02-19 | 2019-05-21 | 新乡市德恩智能工业有限公司 | A kind of hydraulic trigger-type automatically resets hydraulic valve |
| CN109707888A (en) * | 2019-02-19 | 2019-05-03 | 新乡市德恩智能工业有限公司 | A kind of hydraulic trigger-type automatic reset mechanism |
| CN114087248B (en) * | 2021-11-02 | 2022-07-26 | 浙江海宏液压科技股份有限公司 | Reversing valve |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB913322A (en) * | 1961-02-06 | 1962-12-19 | Clark Equipment Co | Fluid control valves |
| CN104728204A (en) * | 2015-03-28 | 2015-06-24 | 合肥长源液压股份有限公司 | Distributor for tractor |
| CN106930994A (en) * | 2017-05-09 | 2017-07-07 | 江苏力源液压机械有限公司 | Position floating reversal valve is jumped in the manual pressurize of tractor |
| CN208935052U (en) * | 2018-09-19 | 2019-06-04 | 合肥长源液压股份有限公司 | A kind of Reversing valve plate with jump position and pressure holding function for agricultural machinery |
-
2018
- 2018-09-19 CN CN201811094795.1A patent/CN109162975B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB913322A (en) * | 1961-02-06 | 1962-12-19 | Clark Equipment Co | Fluid control valves |
| CN104728204A (en) * | 2015-03-28 | 2015-06-24 | 合肥长源液压股份有限公司 | Distributor for tractor |
| CN106930994A (en) * | 2017-05-09 | 2017-07-07 | 江苏力源液压机械有限公司 | Position floating reversal valve is jumped in the manual pressurize of tractor |
| CN208935052U (en) * | 2018-09-19 | 2019-06-04 | 合肥长源液压股份有限公司 | A kind of Reversing valve plate with jump position and pressure holding function for agricultural machinery |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109162975A (en) | 2019-01-08 |
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