CN108591156A - A kind of oil passage change-over valve - Google Patents
A kind of oil passage change-over valve Download PDFInfo
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- CN108591156A CN108591156A CN201810485306.9A CN201810485306A CN108591156A CN 108591156 A CN108591156 A CN 108591156A CN 201810485306 A CN201810485306 A CN 201810485306A CN 108591156 A CN108591156 A CN 108591156A
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- flow slot
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- reversing valve
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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
- F15B13/021—Valves for interconnecting the fluid chambers of an actuator
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- Analytical Chemistry (AREA)
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- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Multiple-Way Valves (AREA)
Abstract
The present invention relates to a kind of oil passage change-over valves, it is characterised in that：Including valve block, reversing valve core, first screw plug, second screw plug, first spring, second spring and overflow valve, valve block is equipped with oil inlet, oil return opening, first actuator port, second actuator port, first passage is equipped in valve block, reversing valve core sliding is located in first passage, first screw plug and the second screw plug are separately fixed at left end and the right end of valve block to block first passage, first spring is located at main control intracavitary, second spring is located at secondary control intracavitary, overflow valve is located on first flow and opens first flow with normal off, reversing valve core can be in first position, the second position, switch between the third place.It is a kind of simple in structure, and manufacturing cost is low, and the oil passage change-over valve automatically controlled may be implemented.
Description
Technical field
The invention belongs to hydraulic valve technology more particularly to a kind of oil passage change-over valves.
Background technology
In recent years, China's most area has started to promote and apply hydraulic reversing plough.It is carried out ploughing ashamed industry with pivot plow, be had
Whether there is or not opening and closing ridge, production efficiency is high, energy saving the advantages that.Hydraulic reversing plough is to control left and right two using the hydraulic system of tractor
Plough body alternately operating is covered, to achieve the purpose that without opening and closing ridge.As shown in fig. 7, the switching mechanism of hydraulic reversing plough includes mainly outstanding
Hanger 111, rotation axis 115, plow beam 112 and oil cylinder 113, rotation axis 115 are welded on hanger bracket 111, and plow beam 112, which is mounted on, to be turned
On moving axis 115,113 both ends of oil cylinder are hinged on axis pin on hanger bracket top and plow beam 112 respectively, and plough body 114 is mounted in plow beam 112
On.Oil cylinder is by the HYDRAULIC CONTROL SYSTEM of tractor, and when ploughing in running order, oil cylinder is in maximum elongation state.It is overturning
When commutation, needs first control cylinder to shorten and plow beam is driven to be flipped up, when plow beam is approximately rotated to upright position, then control oil
Cylinder stretches out, and plow beam is made to cross " dead point " position, cylinder thrust and and gravity under the action of continue to rotate, until the other side works
Stop when position.
Currently, for the overturning control valve of control cylinder, there are mainly two types of forms both at home and abroad, one is the overturnings of manual hydraulic pressure
Control valve, another kind are automatic turning control valves.Manual mode is that manual guiding valve control cylinder is directly manipulated by operator on the tractor
Oil circuit makes alternating plough starting overturning, and plough stirs shift fork in middle position and drives a rotary valve that oil path in oil cylinder is made to convert, and completes to turn over
Convert to, this overturning control valve operator on the tractor in headland turn will also grasp in addition to manipulation direction disk, lifting plough
Vertical overturning control valve, it is very nervous and busy for completing these types action in very short time, and labor intensity increases；It needs simultaneously
It is also high that complexity, cost are not only constructed using two control valves.Automatic turning control valve is to utilize two rotary valves of a set of mechanism controls,
So that the first rotary valve is manipulated oil path in oil cylinder makes plough starting overturning, the second rotary valve control the conversion of oil path in oil cylinder in switching process and realize
The overturning of plough commutates.Although this switching mechanism realizes full-automatic inverting commutation.But structure is sufficiently complex, poor reliability,
But also it need to be still very high with two control rotary valve costs.
Invention content
A kind of simple in structure, manufacture is provided the technical problem to be solved by the present invention is to present situation for the above-mentioned prior art
It is at low cost, the oil passage change-over valve to pivot plow automatic turning commutation control may be implemented.
Technical solution is used by the present invention solves above-mentioned technical problem：A kind of oil passage change-over valve, it is characterised in that：Packet
Valve block is included, valve block is equipped with oil inlet, oil return opening, the first actuator port and the second actuator port, and valve block is equipped with and axially penetrates through
First passage, have on first passage the first through-flow slot of annular, the second through-flow slot, third is through-flow slot, four-way chute and
5th through-flow slot, the first through-flow slot are connected with oil return opening, and the second through-flow slot is connected with the second actuator port, third is through-flow slot
It is connected with oil inlet, four-way chute is connected with the first actuator port, and the 5th through-flow slot passes through the first through flow hole and oil return
Mouth is connected；Reversing valve core is set to first passage and can slide, and reversing valve core is equipped with the first convex shoulder, the second convex shoulder and third
The first passage of convex shoulder, reversing valve core one end constitutes main control chamber, and the first passage of the reversing valve core other end constitutes secondary control chamber,
Main control intracavitary is equipped with the first spring for making reversing valve core keep moving to right trend, and secondary control intracavitary, which is equipped with, makes reversing valve core keep left
The second spring of shifting trend has the left cavity being connected with main control chamber in reversing valve core and is connected with secondary control chamber
Right cavity, left cavity have the first damping hole for be connected to four-way chute, right cavity with selectively with the through-flow slot of third
The second damping hole and right cavity of connection have the third damping hole being selectively connected to the 5th through-flow slot, the first convex shoulder upper edge
It is axially arranged with the first flow of the second through-flow slot and main control chamber of connection；Overflow valve is located on first flow and is opened to normal off
First flow, when the pressure of the second through-flow slot is more than the setting pressure of overflow valve, overflow valve is opened, and fluid is by the second through-flow slot
Main control chamber is flowed into through first flow；Wherein, reversing valve core can be switched between first position, the second position and the third place.
Preferably, when reversing valve core is in first position, the first convex shoulder blocks the first through-flow slot, the second convex shoulder envelope
The through-flow slot of third is blocked, third convex shoulder blocks the 5th through-flow slot, and the second damping hole exposes and is connected with the through-flow slot of third, the
Three damping holes expose and are connected with the 5th through-flow slot；When reversing valve core is in the second position, the first through-flow slot and second leads to
Chute is connected, and the through-flow slot of third is connected with four-way chute, and the second damping hole exposes and is connected with the through-flow slot of third,
Third damping hole is covered the connection disconnected with the 5th through-flow slot；When reversing valve core is in the third place, the second through-flow slot
It is connected with the through-flow slot of third, and four-way chute is connected with the 5th through-flow slot, the second damping hole is covered disconnection and the
Threeway chute is connected, and the exposing of third damping hole is connected with the 5th through-flow slot.
Blocked preferably, the both ends of above-mentioned first passage are respectively equipped with the first screw plug and the second screw plug, the first screw plug and
Main control chamber is formed between reversing valve core, and secondary control chamber is formed between the second screw plug and reversing valve core.
Preferably, being equipped with the first damper in above-mentioned left cavity, the second damper is equipped in above-mentioned right cavity.
Preferably, above-mentioned first flow includes first axis hole and the first oblique hole, first axis hole is stepped logical
Hole, one end are connected with the second through-flow slot, and the other end is connected with one end of the first oblique hole, the other end of the first oblique hole
It is connected with main control chamber.
Preferably, above-mentioned overflow valve includes steel ball, spring base, third spring and closure, closure is threadedly connected to first
For the left end of axial hole to close left end opening, steel ball sliding is located at the heavy caliber portion in first axis hole and the right end phase with spring base
It supports, third spring one end is against the right end of closure, and the other end is against the left end of spring base to push steel ball to keep blocking first axle
To the trend in the small-bore portion in hole.
Compared with the prior art, the advantages of the present invention are as follows：
(1) simple and reasonable for structure, parts are few, at low cost.
(2) it by the design of principle, can realize automatically to the retraction for overturning cylinder, the sequential control stretched out again, to complete
The automatic turning control of pairs of hydraulic reversing plough, is not necessarily to human intervention, high degree of automation.
Description of the drawings
Fig. 1 is the sectional view of the embodiment of the present invention, and reversing valve core is in first position at this time；
Fig. 2 is the partial enlarged view at I in Fig. 1；
Fig. 3 is the hydraulic schematic diagram of the embodiment of the present invention；
Fig. 4 is the embodiment of the present invention using hydraulic schematic diagram；
Fig. 5 is that the reversing valve core of the embodiment of the present invention is in the schematic diagram of the second position；
Fig. 6 is that the reversing valve core of the embodiment of the present invention is in the schematic diagram of the third place；
Fig. 7 is the schematic diagram of hydraulic turnover mechanism.
Specific implementation mode
Below in conjunction with attached drawing embodiment, present invention is further described in detail.
It is a preferred embodiment of the present invention as shown in Fig. 1~2.
A kind of oil passage change-over valve, including：
Valve block 1, valve block 1 is equipped with oil inlet P, oil return inlet T, the first actuator port A and the second actuator port B, in valve block 1
Equipped with the first passage 11 axially penetrated through, there is the first through-flow slot 101 of annular, the second through-flow slot 102, the on first passage 11
Threeway chute 103, four-way chute 104 and the 5th through-flow slot 105, the first through-flow slot 101 are connected with oil return inlet T, and second is logical
Chute 102 is connected with the second actuator port B, and third is through-flow, and slot 103 is connected with oil inlet P, four-way chute 104 and first
Actuator port A is connected, and the 5th through-flow slot 105 is connected by the first through flow hole 106 with oil return inlet T.
Reversing valve core 3 is set to first passage 11 and can slide, and reversing valve core 3 is equipped with the first convex shoulder 301, the second convex shoulder
302 and third convex shoulder 303, the both ends of first passage 11 are respectively equipped with the first screw plug 6a and the second screw plug 6b is blocked, the first screw plug
Main control chamber 1a is formed between 6a and reversing valve core 3, and secondary control chamber 1b is formed between the second screw plug 6b and reversing valve core 3.Master control
The the first spring 5a for making reversing valve core 3 keep moving to right trend is equipped in chamber 1a processed, being equipped in secondary control chamber 1b makes reversing valve core 3 protect
The second spring 5b for the trend of moving to left is held, there is the left cavity 3e and and secondary control being connected with main control chamber 1a in reversing valve core 3
The right cavity 3f that chamber 1b processed is connected, left cavity 3e have the first damping hole 3a, right cavity 3f being connected to four-way chute 104
With the second damping hole 3b and right cavity 3f being selectively connected to the through-flow slot of third 103 with selectively through-flow with the 5th
It is equipped in the first damper 4a, right cavity 3f in third the damping hole 3c, left cavity 3e that slot 105 is connected to and is equipped with the second damper
4b；Reversing valve core 3 can be switched between first position, the second position and the third place, when reversing valve core 3 is in first position
When, the first convex shoulder 301 blocks the first through-flow slot 101, and the second convex shoulder 302 blocks the through-flow slot 103 of third, third convex shoulder 303
Block the 5th through-flow slot 105, the second damping hole 3b exposes and is connected with the through-flow slot of third 103, and third damping hole 3c exposes
And it is connected with the 5th through-flow slot 105；When reversing valve core 3 is in the second position, the first through-flow slot 101 and the second through-flow slot
102 are connected, and the through-flow slot of third 103 is connected with four-way chute 104, the second damping hole 3b expose and with the through-flow slot of third
103 are connected, and third damping hole 3c is covered the connection disconnected with the 5th through-flow slot 105；When reversing valve core 3 is in third position
When setting, the second through-flow slot 102 and third are through-flow, and slot 103 is connected, and four-way chute 104 is connected with the 5th through-flow slot 105,
Second damping hole 3b is covered the through-flow slot of disconnection and third 103 and is connected, and third damping hole 3c exposes and the 5th through-flow slot 105
It is connected.
First convex shoulder, 301 upper edge is axially arranged with the first flow of connection the second through-flow slot 102 and main control chamber 1a, first-class
Road includes first axis hole 3d and the first oblique hole 3m, and first axis hole 3d is notch cuttype through hole, one end and the second through-flow slot
102 are connected, and the other end is connected with one end of the first oblique hole 3m, the other end and the main control chamber 1a phases of the first oblique hole 3m
Connection.Overflow valve 2 is located on first flow and opens first flow to normal off, and overflow valve 2 includes steel ball 2a, spring base 2b, the
Three spring 2c and closure 2d block 2d and are threadedly connected to the left end of first axis hole 3d to close left end opening, steel ball 2a slidings
It is located at the heavy caliber portion of first axis hole 3d and offsets with the right end of spring base 2b, the one end third spring 2c is against the right side for blocking 2d
End, the other end are against the left end of spring base 2b to push steel ball 2a to keep blocking the trend in the small-bore portion of first axis hole 3d；
When the pressure of the second through-flow slot 102 is more than the setting pressure of overflow valve 2, overflow valve 2 is opened, and fluid is by the second through-flow slot 102
Main control chamber 1a is flowed into through first flow.
The operation principle and process of the present invention is as follows：
In application, as shown in Figure 4 (hydraulic lock being actually connected on oil cylinder 10 in figure has been left out), by the present invention's 9
Oil inlet P is connected with the actuator port A1 of the solenoid directional control valve 8 for controlling fuel feeding with B1 respectively with oil return inlet T, of the invention
First actuator port A connections overturn the rod chamber of cylinder 10, and the second actuator port B connections overturn the rodless cavity of cylinder 10.
When pivot plow is in running order, need not be overturn, solenoid directional control valve 8 is in power failure state, oily at this time
Mouth A1, B1 are communicated with oil return inlet T 1, then the oil inlet P of the present invention 12 and oil return inlet T are also at passive state, in the first spring
Under the action of 5a, second spring 5b, reversing valve core 3 is in first position as shown in Figure 1.
When needing control pivot plow to be overturn, solenoid directional control valve 8 is made to charge, then oil inlet P of the invention and hydraulic pressure
7 outlet of pump is connected, and oil return inlet T is connected with fuel tank, as shown in Figure 1, the hydraulic oil that hydraulic pump 7 exports is passed through successively by oil inlet P
Third is through-flow slot 103, the second damping hole 3b, the second damper 4b enter secondary control chamber 1b, and reversing valve core 3 is pushed to move downward
The second position (as shown in Figure 5) makes the through-flow slot of third 103 be communicated with four-way chute 104, to the oil for making hydraulic pump 7 export
Liquid has bar after the through-flow slot 103 of third, four-way chute 104, the first oil inlet A into overturning cylinder 10 successively by oil inlet P
Chamber pushes overturning cylinder 10 to retract；In overturning 10 retraction process of cylinder, since hydraulic oil flows to four-way by the through-flow slot of third 103
Certain pressure difference is will produce when chute 104, to which pressure is big in pressure ratio four-way chute 104 in the through-flow slot 103 of third；The
Threeway chute 103 is connected by the second damping hole 3b, the second damper 4b with secondary control chamber 1b, the first through-flow slot 103 and secondary control
Pressure is equal in chamber 1b processed, and four-way chute 104 passes through the first damping hole 3a, the first damper 4a and main control chamber 1a phases
Even, pressure is equal to pressure in main control chamber 1a in four-way chute 104, so pressure is more than main control chamber 1a in secondary control chamber 1b
Interior pressure, reversing valve core 3 are constantly in the second position (as shown in Figure 5) under differential pressure action, to bounce back in overturning cylinder 10
The through-flow slot of third 103 is connected to always with four-way chute 104 in journey；At the same time the fluid of the rodless cavity of overturning cylinder 10 is through second
Actuator port B, the second through-flow slot 102, the first through-flow slot 101 return to hydraulic fluid port T make overturning cylinder 10 carry out retraction drive pivot plow to
Upper overturning.
After overturning cylinder 10 and being retracted into bottom namely behind pivot plow arrival dead-centre position, pass through the through-flow slot 103 and the 4th of third
Hydraulic oil between through-flow slot 104 stops flowing, so pressure difference is not will produce, in main control chamber 1a and secondary control chamber 1b
Pressure is equal, and reversing valve core 3 moves right under the first spring 5a effects, during reversing valve core 3a is moved right, second
Damping hole 3b is progressively closed off, and third damping hole 3c is gradually opened, and pressure is equal in main control chamber 1a in four-way chute 104 at this time
Pressure, and pressure is less than pressure in the through-flow slot 103 of third in secondary control chamber 1b, so pressure is less than main control in secondary control chamber 1b
Pressure in chamber 1a makes reversing valve core 3 move right the third place shown in Fig. 6 always under differential pressure action, and the 4th is through-flow at this time
Slot 104 is communicated with the 5th through-flow slot 105, and the pressure in main control chamber 1a is equal with 104 pressure of four-way chute, secondary control chamber 1b
Interior hydraulic oil is equal with oil return inlet T pressure through the second damper 4b, third damping hole 3c, to make reversing valve core 3 be maintained at
Three positions (as shown in Figure 6), the fluid of oil inlet P is successively through the through-flow slot 103 of third, the second through-flow slot 102, the second actuator port
The rodless cavity that B enters overturning cylinder 10 pushes the overturning stretching of cylinder 10 that pivot plow is driven to start to downwardly turn over, overturning 10 rod chamber of cylinder
Fluid is returned to through the first actuator port A, four-way chute 104, the 5th through-flow slot 105, the first through flow hole 106, oil return inlet T successively
Fuel tank.
After overturning the stretching of cylinder 10 in place, the pressure of the second actuator port B rises, and triggering overflow valve 2 is opened, the second work
The fluid of hydraulic fluid port B pushes steel ball 2a that the active force of third spring 2c is overcome to move downward, and to open first flow, makes the second work
The fluid for making hydraulic fluid port B enters main control chamber 1a, and reversing valve core 3 is made to be continually maintained in the third place shown in Fig. 6.At this point, making electromagnetism
The pressure of 8 dead electricity of reversal valve, oil inlet P disappears, and reversing valve core 3 returns to figure under the action of the first spring 5a and second spring 5b
Position shown in 1 is prepared for overturning control in next step.Therefore, driver only needs to control automatically controlled button and can complete to turning over
The automatic turning control for turning plough, is not necessarily to human intervention in the transfer process turned under pivot plow is translated into from above.
Claims (6)
1. a kind of oil passage change-over valve, it is characterised in that：Including
Valve block (1), valve block (1) are equipped with oil inlet (P), oil return opening (T), the first actuator port (A) and the second actuator port
(B), valve block (1) is equipped with the first passage (11) axially penetrated through, has the first through-flow slot of annular on first passage (11)
(101), the second through-flow slot (102), third is through-flow slot (103), four-way chute (104) and the 5th through-flow slot (105), first is logical
Chute (101) is connected with oil return opening (T), and the second through-flow slot (102) is connected with the second actuator port (B), third is through-flow slot
(103) it is connected with oil inlet (P), four-way chute (104) is connected with the first actuator port (A), the 5th through-flow slot (105)
It is connected with oil return opening (T) by the first through flow hole (106)；
Reversing valve core (3) is set to first passage (11) and can slide, and reversing valve core (3) is equipped with the first convex shoulder (301), second
The first passage of convex shoulder (302) and third convex shoulder (303), reversing valve core (3) one end constitutes main control chamber (1a), reversing valve core
(3) first passage of the other end constitutes secondary control chamber (1b), and being equipped in main control chamber (1a) makes reversing valve core (3) holding move to right
The first spring (5a) of gesture, secondary control chamber (1b) is interior to be equipped with the second spring (5b) for making reversing valve core (3) keep moving to left trend, changes
There is the left cavity (3e) being connected with main control chamber (1a) and the right sky being connected with secondary control chamber (1b) into spool (3)
There is the first damping hole (3a) being connected to four-way chute (104), right cavity (3f) to have selection for chamber (3f), left cavity (3e)
Property the second damping hole (3b) for being connected to the through-flow slot of third (103) and right cavity (3f) have selectively with the 5th through-flow slot
(105) the third damping hole (3c) being connected to, the first convex shoulder (301) upper edge are axially arranged with the second through-flow slot (102) of connection and master control
The first flow of chamber (1a) processed；
Overflow valve (2), is located on first flow and opens first flow to normal off, when the pressure of the second through-flow slot (102) is more than
When the setting pressure of overflow valve (2), overflow valve (2) is opened, and fluid flows into main control by the second through-flow slot (102) through first flow
Chamber (1a)；
Wherein, reversing valve core (3) can be switched between first position, the second position and the third place.
2. a kind of oil passage change-over valve according to claim 1, it is characterised in that：When reversing valve core (3) is in first position
When, the first convex shoulder (301) blocks the first through-flow slot (101), and the second convex shoulder (302) blocks the through-flow slot of third (103), third
Convex shoulder (303) blocks the 5th through-flow slot (105), and the second damping hole (3b) exposes and is connected with the through-flow slot of third (103), the
Three damping holes (3c) expose and are connected with the 5th through-flow slot (105)；When reversing valve core (3) is in the second position, first is logical
Chute (101) is connected with the second through-flow slot (102), and the through-flow slot of third (103) is connected with four-way chute (104), the
Two damping holes (3b) expose and are connected with the through-flow slot of third (103), and third damping hole (3c) is covered disconnection and leads to the 5th
The connection of chute (105)；When reversing valve core (3) is in the third place, the second through-flow slot (102) and the through-flow slot of third (103)
Be connected, and four-way chute (104) is connected with the 5th through-flow slot (105), the second damping hole (3b) be covered disconnection with
Third is through-flow, and slot (103) is connected, and third damping hole (3c) exposing is connected with the 5th through-flow slot (105).
3. a kind of oil passage change-over valve according to claim 1, it is characterised in that：Distinguish at the both ends of the first passage (11)
It is blocked equipped with the first screw plug (6a) and the second screw plug (6b), forms main control chamber between the first screw plug (6a) and reversing valve core (3)
(1a) forms secondary control chamber (1b) between the second screw plug (6b) and reversing valve core (3).
4. a kind of oil passage change-over valve according to claim 1, it is characterised in that：The first resistance is equipped in the left cavity (3e)
Buddhist nun's device (4a), the right cavity (3f) is interior to be equipped with the second damper (4b).
5. a kind of oil passage change-over valve according to claim 1, it is characterised in that：The first flow includes first axis hole
(3d) and the first oblique hole (3m), first axis hole (3d) are notch cuttype through hole, and one end is connected with the second through-flow slot (102)
Logical, the other end is connected with the one end of the first oblique hole (3m), the other end and main control chamber (1a) phase of the first oblique hole (3m)
Connection.
6. a kind of oil passage change-over valve according to claim 5, it is characterised in that：The overflow valve (2) include steel ball (2a),
Spring base (2b), third spring (2c) and closure (2d) block (2d) and are threadedly connected to the left end in first axis hole (3d) to seal
Left end opening is closed, steel ball (2a) sliding is located at the heavy caliber portion in first axis hole (3d) and offsets with the right end of spring base (2b),
The one end third spring (2c) is against the right end of closure (2d), and the other end is against the left end of spring base (2b) to push steel ball (2a) to protect
Hold the trend in the small-bore portion for blocking first axis hole (3d).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810485306.9A CN108591156B (en) | 2018-05-18 | 2018-05-18 | Oil way switching valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810485306.9A CN108591156B (en) | 2018-05-18 | 2018-05-18 | Oil way switching valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108591156A true CN108591156A (en) | 2018-09-28 |
| CN108591156B CN108591156B (en) | 2020-07-14 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810485306.9A Active CN108591156B (en) | 2018-05-18 | 2018-05-18 | Oil way switching valve |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109296575A (en) * | 2018-11-12 | 2019-02-01 | 温州大学 | A kind of pilot control formula switch valve |
| CN109372812A (en) * | 2018-11-12 | 2019-02-22 | 温州大学苍南研究院 | A kind of damping guide's valve pocket control formula switch valve |
| CN109538562A (en) * | 2018-11-12 | 2019-03-29 | 温州大学激光与光电智能制造研究院 | A kind of guide's valve pocket control formula switch valve |
| CN111059025A (en) * | 2019-12-26 | 2020-04-24 | 宁波真格液压科技有限公司 | Compact air compressor |
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| CN103511678A (en) * | 2013-09-26 | 2014-01-15 | 番禺珠江钢管（珠海）有限公司 | Direct-acting overflow valve and method for establishing and releasing pressure thereof |
| CN204493796U (en) * | 2015-01-16 | 2015-07-22 | 徐工集团工程机械股份有限公司 | Guide structure and load sensing multi-way valve, hydraulic system and engineering machinery |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109296575A (en) * | 2018-11-12 | 2019-02-01 | 温州大学 | A kind of pilot control formula switch valve |
| CN109372812A (en) * | 2018-11-12 | 2019-02-22 | 温州大学苍南研究院 | A kind of damping guide's valve pocket control formula switch valve |
| CN109538562A (en) * | 2018-11-12 | 2019-03-29 | 温州大学激光与光电智能制造研究院 | A kind of guide's valve pocket control formula switch valve |
| CN111059025A (en) * | 2019-12-26 | 2020-04-24 | 宁波真格液压科技有限公司 | Compact air compressor |
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