CN107756868B - Overload protection device for combined pump valve for punch press - Google Patents
Overload protection device for combined pump valve for punch press Download PDFInfo
- Publication number
- CN107756868B CN107756868B CN201711151686.4A CN201711151686A CN107756868B CN 107756868 B CN107756868 B CN 107756868B CN 201711151686 A CN201711151686 A CN 201711151686A CN 107756868 B CN107756868 B CN 107756868B
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- pressure
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- oil
- pump
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- 229910000831 Steel Inorganic materials 0.000 claims description 11
- 239000010959 steel Substances 0.000 claims description 11
- 238000009413 insulation Methods 0.000 claims description 9
- 238000005192 partition Methods 0.000 claims description 4
- 229920000742 Cotton Polymers 0.000 claims description 3
- 238000009825 accumulation Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 238000004080 punching Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/28—Arrangements for preventing distortion of, or damage to, presses or parts thereof
- B30B15/281—Arrangements for preventing distortion of, or damage to, presses or parts thereof overload limiting devices
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Check Valves (AREA)
- Safety Valves (AREA)
Abstract
The invention discloses a combined pump valve overload protection device for a punch press, which comprises a limit switch for controlling the punch press, wherein the limit switch is controlled by a pressure protection valve of the punch press, the pressure protection valve is controlled by the oil pressure output by a pressure protection pump, and the magnitude of the oil pressure is controlled by an air valve. According to the invention, the pressure protection pump is used as a buffer, pressure accumulation and pressure maintaining structure in the middle, the air valve is used as an actuating mechanism, and the pressure protection valve is used as a pressure control structure, so that the safety and the accuracy of equipment are greatly improved.
Description
Technical Field
The invention relates to an overload protection device, in particular to a combined pump valve overload protection device for a punch press.
Background
At present, a certain gap exists between the stamping force of the punch and the stamping force born by the stamping grinding tool used by the punch in the using process of the punch, so that the stamping force of the punch is often larger than the pressure born by the grinding tool, and the overload stamping force of the punch can cause technical defects such as early crack of the grinding tool or a base of the punch. The existing punching machine is used for protecting the pressure valve which mostly adopts a spring structure to realize overload protection, the pressure value of the pressure valve structure is mainly realized by adjusting the elasticity of the spring, and the pressure protection device directly sensed by the spring is very easy to cause technical faults such as fracture and the like due to the fact that the pressure protection device is directly subjected to huge punching force, so that the service life and the pressure control precision of the overload protection device are always the objects of research of technicians in the field.
Disclosure of Invention
The invention provides a combined pump valve overload protection device for a punch press, which has the advantages of accurate pressure control, long service life and high safety performance.
The utility model provides a punch press is with combination formula pump valve overload protection device, includes the limit switch of control punch press, and the limit switch is controlled by the pressure protection valve of punch press, the pressure protection valve be controlled by the oil pressure of pressure protection pump output, the size of oil pressure is controlled by the pneumatic valve of gas circuit connection punch press. The technical structure of the oil pressure matched pressure protection valve prevents the pressure valve from directly bearing the stamping force of the punch, effectively prolongs the service life of equipment, controls the oil pressure by the air valve, improves the accuracy of pressure control, and greatly increases the safety performance of the equipment by taking the pressure protection pump as a buffering, pressure accumulating and pressure maintaining structure in the middle.
The pressure protection valve comprises a valve body, wherein one end of the valve body is connected with an adjusting nut, the adjusting nut is connected with one end of a pressure spring in a matched manner, the other end of the pressure spring is arranged on a spring seat, the spring seat is connected with a sliding shaft, a linkage plate is arranged on the sliding shaft, and the end part of the linkage plate is provided with a screw rod for controlling a limit switch; the other end of the valve body is connected with a pressure protection pump. According to the pressure protection valve structure, the pressure spring, the sliding shaft and the screw rod for controlling the limit switch are made into an integrated connecting structure, so that the pressure protection valve structure is used for sensing the stamping pressure conducted by the pressure protection pump, and the safety performance and the control precision of equipment are improved.
The sliding shaft one end be equipped with the arch, the arch cup joints the mounting hole on the interlock board, the interlock board outside is equipped with lock nut threaded connection sliding shaft, the sliding shaft other end is equipped with the shrinkage pool, the shrinkage pool is embedded to have plastic steel cylinder to improve the hardness and the sealing performance of sliding shaft.
The valve body and adjusting nut threaded connection, be equipped with the locking hole of perpendicular adjusting nut outer wall on the valve body, install in the locking hole in proper order and compel tight cylinder, fastening screw, compel tight cylinder laminating and connect adjusting nut outer wall. The adjusting nut belongs to negative pressure adjustment in the elastic process of adjusting the pressure spring, wherein the negative pressure adjustment means that the adjusting nut needs to overcome the pressure from the tightening cylinder in the rotating process, so that the excessive axial force given to the adjusting nut by the pressure spring is avoided, namely the stability of the axial spiral force is maintained through the vertical pressure.
The pressure protection pump comprises an oil suction port and an oil return port which are connected with an oil tank, negative pressure suction force of the oil suction port is generated through a negative pressure cavity in the pressure protection pump, the negative pressure cavity comprises a reducing hole which is arranged in a pump body of the pressure protection pump and is communicated with a left cavity and a right cavity, one end of an oil outlet shaft is arranged in the left cavity, an oil seal which is arranged in an oil seal seat is sleeved on the periphery of one end of the oil outlet shaft, and the oil seal seat is in threaded connection with the pump body of the pressure protection pump; the right chamber is internally provided with a one-way valve, a movable shaft and a sliding shaft seat in sequence, and the sliding shaft seat is provided with an oil hole communicated with an oil return port. The pressure protection pump sucks pressure oil from an oil tank into a pump body of the pressure protection pump through negative pressure generated by the reciprocating motion of the oil outlet shaft, and reaches a right chamber through a one-way valve through a reducing hole from a left chamber, and the pressure oil pushes a sliding shaft in a sliding shaft seat by utilizing oil pressure so as to give accurate stamping pressure to the pressure protection valve.
The inner walls of the sliding shaft seats at the front side and the rear side of the oil hole are respectively connected with a movable shaft and a sliding shaft, the center of the movable shaft is provided with a through hole, one end part of the movable shaft is in airtight fit with a plastic steel cylinder, when the oil pressure is in a safe range, the sliding shaft is fixed and seals the sliding shaft seat, when the oil pressure is overloaded, the pressure oil pushes the sliding shaft to move through the through hole in the center of the movable shaft, so that the limit switch controlled by the pressure protection valve closes the punch press, and the pressure oil can be discharged to the oil return port through the air hole in the moving process of the sliding shaft to achieve the technical purpose of pressure relief.
The through hole in the center of the movable shaft is communicated with the one-way valve, the one-way valve comprises a one-way valve body, the center of the one-way valve body is provided with a through hole, a backstop seat and a spring seat are sequentially installed in the through hole, through holes are formed in the centers of the backstop seat and the spring seat, backstop steel balls are installed in the through holes, and the steel balls are matched and connected with springs in the spring seat. The single valve structure can ensure that pressure oil can not flow back to the oil suction port, ensure the stability of oil pressure in the right cavity in the normal working process of the punch, avoid the impact of instantaneous pressure of the punch on the pressure protection valve, and prolong the service life of equipment.
The air valve comprises an air cylinder, a left air cylinder and a right air cylinder are respectively arranged in the air cylinder, a piston arranged on the oil outlet shaft is arranged in the right air cylinder, and a switching valve is arranged in the left air cylinder; the switching valve comprises a switching valve body, the switching valve body is connected with a left cylinder, a first air chamber connected with an air inlet is formed by matching the outer wall of the switching valve body with the left cylinder, a valve core is arranged in the switching valve body, the valve core comprises a front ring body and a rear ring body, the front ring body is matched and connected with one end of an air guide seat, a second air chamber is formed by matching the outer wall of the front ring body with the switching valve body with the outer wall of the air guide seat, a third air chamber is formed by matching the inner wall of the air guide seat with the front ring body and the rear ring body, and the third air chamber is communicated with an air outlet chamber through an air outlet in the valve core; the end face of the rear ring body is matched with the air guide seat to form a fourth air chamber; the partition body for separating the left cylinder from the right cylinder of the cylinder is matched with the outer end surface of the air guide seat to form a fifth air chamber, and the fifth air chamber is communicated with the first air chamber; the fifth air chamber is communicated with the fourth air chamber through a concave ring positioned on the oil outlet shaft. The cylinder structure drives the oil outlet shaft back and forth by utilizing air pressure through the switching valve to carry out supercharging on the pressure protection pump until the pressure reached by the pressure protection pump is balanced with the pressure of the punching machine to realize the technical purpose of pressure protection.
A spacing ring is arranged between the fifth air chamber and the oil outlet shaft, and an air passing hole is arranged on the spacing ring. The outdoor end of giving vent to anger is equipped with sound insulation device, sound insulation device include the soundproof cotton that two acoustic celotex boards pressed from both sides, be equipped with reset spring between acoustic celotex board and the preceding ring body to noise when reducing the exhaust.
According to the invention, the pressure protection pump is used as a buffer, pressure accumulation and pressure maintaining structure in the middle, the air valve is used as an actuating mechanism, and the pressure protection valve is used as a pressure control structure, so that the safety and the accuracy of equipment are greatly improved.
Drawings
FIG. 1 is a schematic diagram showing the front view of the combined pump valve overload protection device for the punch press;
FIG. 2 is a schematic diagram of the air valve according to the present invention;
FIG. 3 is a schematic diagram of the structure of the pressure protection pump according to the present invention;
FIG. 4 is a schematic diagram of the structure of the pressure protection valve according to the present invention;
fig. 5 is a schematic diagram of the structure of the exhaust port in the present invention.
Detailed Description
The overload protection device for the combined pump valve for the punch press comprises a limit switch 3 for controlling the punch press, wherein the limit switch 3 is controlled by a pressure protection valve of the punch press, the pressure protection valve is controlled by the oil pressure output by a pressure protection pump, and the magnitude of the oil pressure is controlled by an air valve.
The pressure protection valve comprises a valve body 4, one end of the valve body 4 is connected with an adjusting nut 58, the adjusting nut 58 is matched and connected with one end of a pressure spring 55, the other end of the pressure spring 55 is installed on a spring seat, the spring seat is connected with a sliding shaft 51, a linkage plate 53 is installed on the sliding shaft 51, and the end part of the linkage plate 53 is provided with a screw rod 52 for controlling a limit switch 3. The other end of the valve body 4 is connected with the pressure protection pump 2. One end of the sliding shaft 51 is provided with a bulge, the bulge is sleeved with a mounting hole on the linkage plate 53, the outer side of the linkage plate 53 is provided with a locking nut 54 in threaded connection with the sliding shaft 51, the other end of the sliding shaft 51 is provided with a concave hole, and a plastic steel cylinder 50 is embedded in the concave hole so as to improve the hardness and sealing performance of the sliding shaft.
The valve body 4 is in threaded connection with the adjusting nut 58, a locking hole perpendicular to the outer wall of the adjusting nut 58 is formed in the valve body 4, a tightening cylinder 57 and a tightening screw 56 are sequentially installed in the locking hole, the tightening cylinder 57 is attached to the outer wall of the adjusting nut 58, and the fact that the adjusting nut 58 is used for preventing the pressure spring from giving excessive axial force to the adjusting nut in the elastic process of the adjusting pressure spring 55, namely, the stability of axial spiral force is kept through vertical pressure is achieved.
The pressure protection pump 2 comprises an oil suction port 39 and an oil return port 7 which are connected with an oil tank, negative pressure suction force of the oil suction port 39 is generated through a negative pressure cavity in the pressure protection pump, the negative pressure cavity comprises a reducing hole 8 which is arranged in a pump body of the pressure protection pump, the reducing hole 8 is communicated with a left cavity and a right cavity, one end of an oil outlet shaft 12 is arranged in the left cavity, an oil seal 35 which is arranged in an oil seal seat 34 is sleeved on the periphery of one end of the oil outlet shaft 12, and the oil seal seat 34 is in threaded connection with the pump body of the pressure protection pump 2. The right chamber is sequentially provided with a one-way valve 48, a movable shaft 45 and a sliding shaft seat 47, and the sliding shaft seat 47 is provided with an oil hole 46 communicated with an oil return port. The inner walls of the sliding shaft seat 47 at the front side and the rear side of the oil hole 46 are respectively connected with a movable shaft 48 and a sliding shaft 51, the center of the movable shaft 48 is provided with a through hole, and one end part of the movable shaft 48 is in airtight fit with a plastic steel cylinder 50. The pressure protection pump 2 is provided with an exhaust hole 59, and the exhaust hole 59 is opened and closed by the exhaust screw 49.
The through hole in the center of the movable shaft 48 is communicated with the check valve 48, the check valve 48 comprises a check valve body, the center of the check valve body is provided with a through hole, the check seat 41 and the spring seat 44 are sequentially installed in the through hole, the centers of the check seat 41 and the spring seat 44 are respectively provided with a through hole, the through hole is internally provided with a check steel ball 42, and the steel ball 42 is matched and connected with the spring 43 in the spring seat.
The air valve comprises an air cylinder 23, a left air cylinder and a right air cylinder 24 are respectively arranged in the air cylinder 23, a piston 11 arranged on an oil outlet shaft 12 is arranged in the right air cylinder 24, a spring seat 10 connected with a spring 9 is respectively arranged on the outer side of the piston 11, and an annular bulge 30 integrated with the oil outlet shaft 12 is arranged between the spring seat 10 and the piston 11. The left cylinder is internally provided with a switching valve, the switching valve comprises a switching valve body 18, the switching valve body 18 is connected with the left cylinder, the outer wall of the switching valve body 18 is matched with the left cylinder to form a first air chamber 5 connected with an air inlet 1, a valve core is arranged in the switching valve body, the valve core comprises a front ring body and a rear ring body, the front ring body 19 is matched and connected with one end of an air guide seat 20, the outer wall of the front ring body 19 is matched with the outer wall of the switching valve body to form a second air chamber 14, the inner wall of the air guide seat 20 is matched with the front ring body 19 and the rear ring body 25 to form a third air chamber 70, and the third air chamber 70 is communicated with an air outlet chamber 27 through an air outlet hole 26 in the valve core; the end face of the rear ring body 25 is matched with the air guide seat 20 to form a fourth air chamber 31; the partition body for separating the left cylinder from the right cylinder is matched with the outer end surface of the air guide seat 20 to form a fifth air chamber 28, and the fifth air chamber 28 is communicated with the first air chamber 5. The fifth air chamber 28 and the fourth air chamber 31 are communicated through a concave ring 29 positioned on the oil outlet shaft 12. A spacing ring 21 is arranged between the fifth air chamber and the oil outlet shaft 12, and an air passing hole is arranged on the spacing ring 21. The partition body for separating the left cylinder from the right cylinder is provided with a ring body 22 matched with the oil outlet shaft.
The outer end of the air outlet chamber 27 is provided with a sound insulation device, the sound insulation device comprises a sound insulation cotton 16 clamped by two sound insulation plates 15, and a return spring 17 is arranged between the sound insulation plates and the front ring body so as to reduce noise during exhaust.
The specific working flow of the invention is as follows: the air inlet 1 is used for feeding air, the front ring body 19 is pushed to move forwards by the air through the first air chamber 5, the air reaches the second air chamber 14, the second air chamber 14 is communicated with the right air cylinder 24 to push the piston 11 to move, the oil outlet shaft 12 is driven to move forwards, and the oil outlet shaft 12 is used for discharging the air in the negative pressure cavity in the pressure protection pump 2 through the exhaust hole 59. In the process, the oil outlet shaft 12 moves forwards to the air passing hole on the concave ring 29 communicated with the spacing ring 21, namely the fifth air chamber 28, the first air chamber 5 and the fourth air chamber 31 are mutually communicated, at the moment, the air in the fourth air chamber 31 pushes the rear ring body 25 to move backwards, the second air chamber 14 is communicated with the third air chamber 70, the air in the right air cylinder 24 passes through the second air chamber 14 and reaches the air outlet chamber 27 to be discharged through the third air chamber 70, meanwhile, the piston 11 drives the oil outlet shaft 12 to move backwards under the action of the spring 9, vacuum negative pressure is formed in the negative pressure cavity to suck pressure oil into the negative pressure cavity through the oil suction port 39, the pressure oil provides pressure for the sliding shaft 51 through the movable shaft 45 by virtue of the one-way valve, and the sliding shaft 51 is pushed to close the limit switch 3 only when the pressure of the punch is larger than the pressure of the pressure protection pump, namely in an overload state.
Claims (6)
1. The utility model provides a punch press is with combination formula pump valve overload protection device, includes the limit switch of control punch press, and limit switch is controlled by the pressure protection valve of punch press, its characterized in that: the pressure protection valve is controlled by the oil pressure output by the pressure protection pump, and the oil pressure is controlled by the air valve;
the pressure protection valve comprises a valve body, wherein one end of the valve body is connected with an adjusting nut, the adjusting nut is connected with one end of a pressure spring in a matched manner, the other end of the pressure spring is arranged on a spring seat, the spring seat is connected with a sliding shaft, a linkage plate is arranged on the sliding shaft, and the end part of the linkage plate is provided with a screw rod for controlling a limit switch; the other end of the valve body is connected with a pressure protection pump;
one end of the sliding shaft is provided with a bulge, the bulge is sleeved with a mounting hole on the linkage plate, the outer side of the linkage plate is provided with a locking nut in threaded connection with the sliding shaft, the other end of the sliding shaft is provided with a concave hole, and a plastic steel cylinder is embedded in the concave hole;
the air valve comprises an air cylinder, a left air cylinder and a right air cylinder are respectively arranged in the air cylinder, a piston arranged on the oil outlet shaft is arranged in the right air cylinder, and a switching valve is arranged in the left air cylinder; the switching valve comprises a switching valve body, the switching valve body is connected with a left cylinder, a first air chamber connected with an air inlet is formed by matching the outer wall of the switching valve body with the left cylinder, a valve core is arranged in the switching valve body, the valve core comprises a front ring body and a rear ring body, the front ring body is matched and connected with one end of an air guide seat, a second air chamber is formed by matching the outer wall of the front ring body with the switching valve body with the outer wall of the air guide seat, a third air chamber is formed by matching the inner wall of the air guide seat with the front ring body and the rear ring body, and the third air chamber is communicated with an air outlet chamber through an air outlet in the valve core; the end face of the rear ring body is matched with the air guide seat to form a fourth air chamber; the partition body for separating the left cylinder from the right cylinder of the cylinder is matched with the outer end surface of the air guide seat to form a fifth air chamber, and the fifth air chamber is communicated with the first air chamber; the fifth air chamber is communicated with the fourth air chamber through a concave ring positioned on the oil outlet shaft;
the pressure protection pump comprises an oil suction port and an oil return port which are connected with an oil tank, negative pressure suction force of the oil suction port is generated through a negative pressure cavity in the pressure protection pump, the negative pressure cavity comprises a reducing hole which is arranged in a pump body of the pressure protection pump and is communicated with a left cavity and a right cavity, one end of an oil outlet shaft is arranged in the left cavity, an oil seal which is arranged in an oil seal seat is sleeved on the periphery of one end of the oil outlet shaft, and the oil seal seat is in threaded connection with the pump body of the pressure protection pump; the right chamber is internally provided with a one-way valve, a movable shaft and a sliding shaft seat in sequence, and the sliding shaft seat is provided with an oil hole communicated with an oil return port.
2. The modular pump valve overload protection device for a punch press of claim 1, wherein: the valve body and
the adjusting nut is in threaded connection, a locking hole perpendicular to the outer wall of the adjusting nut is formed in the valve body, and a tightening cylinder and a fastening screw are sequentially installed in the locking hole and are attached to the outer wall of the adjusting nut.
3. The modular pump valve overload protection device for a punch press of claim 1, wherein: the oil hole is arranged in front and behind
The inner walls of the sliding shaft seats at the two sides are respectively connected with a movable shaft and a sliding shaft, the center of the movable shaft is provided with a through hole, and one end part of the movable shaft is in airtight fit with the plastic steel cylinder.
4. A combined pump valve overload protection device for a punch press as claimed in claim 3, wherein: in the movable shaft
The through hole of the core is communicated with the one-way valve, the one-way valve comprises a one-way valve body, the center of the one-way valve body is provided with a through hole, and the through holes are internally provided with the one-way valve body in sequence
The check seat and the spring seat are provided with through holes at the centers, check steel balls are arranged in the through holes and are matched with each other
And a spring in the spring seat is connected.
5. The modular pump valve overload protection device for a punch press of claim 1, wherein: the fifth air chamber
A spacing ring is arranged between the oil outlet shaft and the oil outlet shaft, and a gas passing hole is arranged on the spacing ring.
6. The modular pump valve overload protection device for a punch press of claim 1, wherein: the air outlet chamber
The outer end is equipped with sound insulation device, sound insulation device include the soundproof cotton that two acoustic celotex board pressed from both sides, be equipped with reset spring between acoustic celotex board and the preceding ring body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711151686.4A CN107756868B (en) | 2017-11-18 | 2017-11-18 | Overload protection device for combined pump valve for punch press |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711151686.4A CN107756868B (en) | 2017-11-18 | 2017-11-18 | Overload protection device for combined pump valve for punch press |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107756868A CN107756868A (en) | 2018-03-06 |
| CN107756868B true CN107756868B (en) | 2024-01-12 |
Family
ID=61278935
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711151686.4A Active CN107756868B (en) | 2017-11-18 | 2017-11-18 | Overload protection device for combined pump valve for punch press |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107756868B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109382456B (en) * | 2018-12-04 | 2024-05-03 | 嵊州市元昊机械有限公司 | Double-channel eccentric overload protector |
| CN109396291B (en) * | 2018-12-04 | 2024-03-19 | 嵊州市元昊机械有限公司 | Spring type overload protector |
| CN109555737B (en) * | 2019-01-23 | 2024-02-20 | 广东华茂精密制造股份有限公司 | Locking pump for locking slide block oil cylinder of quick punching machine |
| CN112046073B (en) * | 2020-08-25 | 2022-09-27 | 浙江斯特隆科技有限公司 | Overload pump |
| CN112058988B (en) * | 2020-08-25 | 2022-12-06 | 浙江斯特隆科技有限公司 | Four-loop pneumatic oil pressure device |
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| CN2125024U (en) * | 1992-06-16 | 1992-12-16 | 成都科技大学 | High pressure gas or liquid pump |
| JPH09229021A (en) * | 1996-02-23 | 1997-09-02 | Sumitomo Eaton Kiki Kk | Timer valve of mechanical brake device for hydraulic motor |
| TWM281726U (en) * | 2005-06-24 | 2005-12-01 | Hung-Ming Hung | Over-loading protection device |
| CN2748200Y (en) * | 2004-10-25 | 2005-12-28 | 洪宏明 | Overloading protection apparatus |
| CN103089737A (en) * | 2013-01-31 | 2013-05-08 | 杨洁 | Balance valve of dynamic load differential pressure protection and flow pressure air chamber compensation |
| CN203146948U (en) * | 2013-03-19 | 2013-08-21 | 永一阀门集团有限公司 | Built-in type vacuum negative-pressure safety valve |
| CN204524093U (en) * | 2015-02-15 | 2015-08-05 | 浙江金鹰食品机械有限公司 | The hydraulic pressure overload protective device of numerical control press |
| DE102016203559A1 (en) * | 2016-03-04 | 2017-09-07 | Schaeffler Technologies AG & Co. KG | Hydraulically operated switching valve |
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2017
- 2017-11-18 CN CN201711151686.4A patent/CN107756868B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2125024U (en) * | 1992-06-16 | 1992-12-16 | 成都科技大学 | High pressure gas or liquid pump |
| JPH09229021A (en) * | 1996-02-23 | 1997-09-02 | Sumitomo Eaton Kiki Kk | Timer valve of mechanical brake device for hydraulic motor |
| CN2748200Y (en) * | 2004-10-25 | 2005-12-28 | 洪宏明 | Overloading protection apparatus |
| TWM281726U (en) * | 2005-06-24 | 2005-12-01 | Hung-Ming Hung | Over-loading protection device |
| CN103089737A (en) * | 2013-01-31 | 2013-05-08 | 杨洁 | Balance valve of dynamic load differential pressure protection and flow pressure air chamber compensation |
| CN203146948U (en) * | 2013-03-19 | 2013-08-21 | 永一阀门集团有限公司 | Built-in type vacuum negative-pressure safety valve |
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| DE102016203559A1 (en) * | 2016-03-04 | 2017-09-07 | Schaeffler Technologies AG & Co. KG | Hydraulically operated switching valve |
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| CN107756868A (en) | 2018-03-06 |
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