CN108317124A - A kind of novel high-voltage circuit-breaker hydraulic working cylinder with combined buffer plunger - Google Patents
A kind of novel high-voltage circuit-breaker hydraulic working cylinder with combined buffer plunger Download PDFInfo
- Publication number
- CN108317124A CN108317124A CN201810197860.7A CN201810197860A CN108317124A CN 108317124 A CN108317124 A CN 108317124A CN 201810197860 A CN201810197860 A CN 201810197860A CN 108317124 A CN108317124 A CN 108317124A
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- Prior art keywords
- piston
- plunger
- combined floodgate
- hydraulic
- working cylinder
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Classifications
-
- 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
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
-
- 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
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/22—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke
- F15B15/224—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke having a piston which closes off fluid outlets in the cylinder bore by its own movement
Abstract
The invention discloses a kind of novel high-voltage circuit-breaker hydraulic working cylinders with combined buffer plunger, are mainly made of piston rod, left pressing plate, guide sleeve, connector sleeve, combined floodgate cushion collar, working cylinder cylinder body, combined floodgate buffer plunger, piston, splitting lock cushioning plunger, splitting lock cushioning set and right pressing plate etc..When hydraulic the cylinder piston will move to the right terminal of stroke, the hydraulic oil in rodless cavity II must could be discharged by the gap formed between splitting lock cushioning outer plunger surface and splitting lock cushioning set inner surface；When hydraulic the cylinder piston will move to the left terminal of stroke, the hydraulic oil in rod chamber I must could be discharged by the gap formed between combined floodgate buffer plunger outer surface and combined floodgate cushion collar inner surface, to increase oil return resistance, piston speed be made to reduce；Simultaneously as its cushion collar uses the structure of cylindrical surface circular conical surface Cylinder Combination, so that it is possessed, surge pressure is low, and braking time is short, stable buffering, the good feature of centring property.
Description
Technical field
The present invention relates to a kind of hydraulic working cylinder more particularly to it is a kind of with combined buffer plunger, be suitable for million
Lie prostrate the novel high speed hydraulic working cylinder of hydraulic operating mechanism of high voltage circuit breaker.
Background technology
It is most common as hydraulic working cylinder drags heavy component as high speed when the executive component of hydraulic drive and control
When moving to end of travel, if without suitable buffer unit, violent pressure and blunt forces shock and vibration often occurs,
Keep system work unstable, generate ear-piercing noise, sometimes even so that fastener loosens, damage hydraulicdriven part, influences
Hydraulic Elements and system lifetim have prodigious danger.Hydraulic working cylinder is as million volts of high-voltage circuitbreaker hydraulic operatings
The important component of mechanism, performance directly determine the quality of circuit-breaker switching on-off performance.When executing breaking-closing operating,
The speed of hydraulic working cylinder has reached 14m/s, while the Load weight quality of hydraulic cylinder reaches 136kg, such big energy of high speed
The movement of amount needs suitable buffer structure to reduce impact of the operating mechanism when divide-shut brake is completed as the termination of movement.
There are many buffered forms of conventional cylinder, can generally be divided into buffer rubber gasket, buffer spring, hydraulic cushion.
Hydraulic cushion can be divided into outer buffering and build buffer loop progress throttling buffering i.e. in hydraulic system again；Interior buffering is i.e. in hydraulic pressure
Suitable buffer structure is designed on cylinder carries out throttling buffering.For the hydraulic for hydraulic operating mechanism of high voltage circuit breaker
Cylinder is determined due to the high stability less trouble required by its high speed big energy snubber time is short and hydraulic actuating mechanism
Buffer rubber gasket, this kind of buffering of buffer spring are not suitable for hydraulic actuating mechanism；Hydraulic cylinder internal mechanism is slow in hydraulic cushion
Punching is the optimal selection of hydraulic actuating mechanism.
Its interior buffer plunger of the existing working cylinder for hydraulic operating mechanism of high voltage circuit breaker is stepped ramp type or single
Cylindrical surface and circular conical surface, because buffer gap size is discontinuous, delay although what is buffered in stepped ramp type is easily worked
Cavity pressure has apparent pressure fluctuation when rushing；Buffering is difficult to ensure that, to neutrality, difficulty of processing is big and single in single cylindrical surface
Hydraulic oil surge pressure and piston are last in master cylinder under the premise of not reducing the average speed of work cylinder working for one circular conical surface
Hold the effect of speed also unsatisfactory.
Invention content
In order to solve the problems, such as that background technology, the present invention propose a kind of novel height with combined buffer plunger
Voltage breaker hydraulic working cylinder.The buffer plunger structure combined using cylindrical surface and circular conical surface.When high-voltage circuitbreaker executes separating brake
When operation, hydraulic working cylinder high speed piston moves right, and when piston will move to stroke terminal, splitting lock cushioning plunger enters
Splitting lock cushioning set, at this time the hydraulic oil in rodless cavity II must pass through splitting lock cushioning outer plunger surface and splitting lock cushioning set inner surface
Between the gap that is formed could be discharged by rodless cavity hydraulic fluid port；When high-voltage circuitbreaker executes closing operation, hydraulic working cylinder is lived
Plug high speed moves downward, and when piston will move to stroke terminal, combined floodgate buffer plunger enters combined floodgate cushion collar, there is bar at this time
Hydraulic oil in chamber I must could be led to by the gap formed between combined floodgate buffer plunger outer surface and combined floodgate cushion collar inner surface
Cross the discharge of rod chamber hydraulic fluid port；To increase oil return resistance, piston speed is made to reduce；Simultaneously as this novel hydraulic working cylinder
Cushion collar use cylindrical surface-circular conical surface-Cylinder Combination structure, so that it is possessed, surge pressure is low, and braking time is short
Feature, and there is preferable centring property, the buffer invalidation caused by misaligning is avoided, cavity pressure arteries and veins when reducing buffering
It is dynamic so that buffering course is more steady, good buffer effect, while reducing difficulty of processing again.
The technical solution adopted by the present invention to solve the technical problems includes：
Piston rod (1), left pressing plate (2), guide sleeve (3), connector sleeve (4), rod chamber hydraulic fluid port (5), combined floodgate cushion collar (6), work
Cylinder cylinder body (7), combined floodgate buffer plunger (8), piston (9), splitting lock cushioning plunger (10), splitting lock cushioning set (11), rodless cavity hydraulic fluid port
(12) and right pressing plate (13)；Between combined floodgate cushion collar (6) right side, working cylinder cylinder body (7) inner surface and piston (9) left side
Cavity formed rod chamber I；Between piston (9) right side, working cylinder cylinder body (7) inner surface and splitting lock cushioning set (11) left side
Cavity formed rodless cavity II；Be machined with circular through hole among left pressing plate (2), piston rod (1) in left pressing plate (2) circular through hole
Surface gap coordinates；Left pressing plate (2) is fixedly connected with working cylinder cylinder body (7) by screw；It is machined with circle among guide sleeve (3)
Through-hole, piston rod (1) coordinates with guide sleeve (3) circular through hole internal surface gaps, and is sealed by a seal ring；Guide sleeve
(3) left end contacts positioning with left pressing plate (2), and right end contacts positioning with connector sleeve (4), and even by positioning pin and left pressing plate (2)
It is circumferentially positioned to tap into row；Circular through hole, piston rod (1) and connector sleeve (4) circular through hole inner surface are machined among connector sleeve (4)
Clearance fit；Connector sleeve (4) outer surface coordinates with working cylinder cylinder body (7) internal surface gaps, and is sealed by a seal ring；Even
Female connector (4) left end contacts positioning with guide sleeve (3), and right end contacts positioning with combined floodgate cushion collar (6), and passes through positioning pin and guiding
It is circumferentially positioned to cover (3) connection progress；Combined floodgate cushion collar (6) left end contacts positioning, right end and working cylinder cylinder body with connector sleeve (4)
(7) step positions；Piston rod (1) surface is machined with combined floodgate buffer plunger (8)；Piston (9) outer surface is interior with working cylinder cylinder body (7)
Surface gap coordinates, and is sealed by a seal ring；It is machined with circular through hole, piston rod (1) and piston among piston (9)
(9) circular through hole internal surface gaps coordinate, and piston (9) left end is positioned with piston rod (1) step；Piston rod (1) right end is machined with
External screw thread, splitting lock cushioning plunger (10) are machined with internal thread, and piston (9) right end is fastened by splitting lock cushioning plunger (10) and positioned；
Splitting lock cushioning plunger (10) is loosened by positioning pin；Splitting lock cushioning set (11) left end is positioned with working cylinder cylinder body (7) step, right end
Positioning is contacted with right pressing plate (13)；Right pressing plate (13) is fixedly connected with working cylinder cylinder body (7) by screw, and by sealing ring into
Row sealing；When high-voltage circuitbreaker executes sub-switching operation, hydraulic the cylinder piston (9) moves right at a high speed, when piston (9) will
When moving to stroke terminal, splitting lock cushioning plunger (10) enters splitting lock cushioning set (11), and the hydraulic oil in rodless cavity II must at this time
It must could be by no bar by the gap formed between splitting lock cushioning plunger (10) outer surface and splitting lock cushioning set (11) inner surface
Chamber hydraulic fluid port (12) is discharged；When high-voltage circuitbreaker executes closing operation, hydraulic the cylinder piston (9) moves downward at a high speed, works as work
When plug (9) will move to stroke terminal, combined floodgate buffer plunger (8) enters combined floodgate cushion collar (6), at this time the liquid in rod chamber I
Pressure oil must could be passed through by the gap formed between combined floodgate buffer plunger (8) outer surface and combined floodgate cushion collar (6) inner surface
Rod chamber hydraulic fluid port (5) is discharged；To increase oil return resistance, make the reduction of piston (9) speed；Simultaneously as this novel hydraulic work
The cushion collar for making cylinder uses the structure of cylindrical surface-circular conical surface-Cylinder Combination, so that it is possessed surge pressure low, braking time
Short feature, and there is preferable centring property, the buffer invalidation caused by misaligning is avoided, cavity pressure when reducing buffering
Pulsation so that buffering course is more steady, good buffer effect, while reducing difficulty of processing again.
Compared with the background technology, the present invention, it has an advantageous effect in that：
（1）Compared with conventional hydraulic working cylinder, the utility model hydraulic cylinder is not in the case where reducing work average speed, peak value in cylinder
Pressure is lower with piston end speed, good buffer effect.
（2）Compared with conventional hydraulic working cylinder, the utility model hydraulic cylinder has preferable centring property, avoids drawing because misaligning
The buffer invalidation risen, increases the service life of working cylinder.
（3）Compared with conventional hydraulic working cylinder, cavity pressure is pulsed when the utility model hydraulic cylinder reduces buffering so that buffering
Process is more steady, avoids the shock and vibration of working cylinder.
（4）Compared with conventional hydraulic working cylinder, requirement of the utility model hydraulic cylinder to machining accuracy is relatively low, reduces difficult processing
Degree.
Description of the drawings
Fig. 1 is the structural schematic diagram of the present invention.
It is partially schematic in splitting lock cushioning set through-hole that Fig. 2 is that splitting lock cushioning plunger first stage cylindrical surface of the present invention moves to
Figure.
It is partially schematic in splitting lock cushioning set through-hole that Fig. 3 is that splitting lock cushioning plunger second stage circular conical surface of the present invention moves to
Figure.
It is partially schematic in splitting lock cushioning set through-hole that Fig. 4 is that splitting lock cushioning plunger phase III cylindrical surface of the present invention moves to
Figure.
Fig. 5 is the structural schematic diagram of splitting lock cushioning plunger of the present invention.
It is partially schematic in combined floodgate cushion collar through-hole that Fig. 6 is that combined floodgate buffer plunger first stage cylindrical surface of the present invention moves to
Figure.
It is partially schematic in combined floodgate cushion collar through-hole that Fig. 7 is that combined floodgate buffer plunger second stage circular conical surface of the present invention moves to
Figure.
It is partially schematic in combined floodgate cushion collar through-hole that Fig. 8 is that combined floodgate buffer plunger phase III cylindrical surface of the present invention moves to
Figure.
Fig. 9 is the structural schematic diagram of combined floodgate buffer plunger of the present invention.
Specific implementation mode
The invention will be further described with reference to the accompanying drawings and examples：
Fig. 1 is the structural schematic diagram of the present invention, includes mainly piston rod 1, left pressing plate 2, guide sleeve 3, connector sleeve 4, rod chamber oil
Mouthfuls 5, combined floodgate cushion collar 6, working cylinder cylinder body 7, combined floodgate buffer plunger 8, piston 9, splitting lock cushioning plunger 10, splitting lock cushioning set 11,
Rodless cavity hydraulic fluid port 12 and right pressing plate 13.
It is partially schematic in splitting lock cushioning set through-hole that Fig. 2 is that splitting lock cushioning plunger first stage cylindrical surface of the present invention moves to
Figure, mainly include stopper rod 1, working cylinder cylinder body 7, piston 9, splitting lock cushioning plunger 10, splitting lock cushioning set 11, rodless cavity hydraulic fluid port 12 with
And right pressing plate 13.
It is partially schematic in splitting lock cushioning set through-hole that Fig. 3 is that splitting lock cushioning plunger second stage circular conical surface of the present invention moves to
Figure, mainly include stopper rod 1, working cylinder cylinder body 7, piston 9, splitting lock cushioning plunger 10, splitting lock cushioning set 11, rodless cavity hydraulic fluid port 12 with
And right pressing plate 13.
It is partially schematic in splitting lock cushioning set through-hole that Fig. 4 is that splitting lock cushioning plunger phase III cylindrical surface of the present invention moves to
Figure, mainly include stopper rod 1, working cylinder cylinder body 7, piston 9, splitting lock cushioning plunger 10, splitting lock cushioning set 11, rodless cavity hydraulic fluid port 12 with
And right pressing plate 13.
Fig. 5 is the structural schematic diagram of splitting lock cushioning plunger of the present invention, includes mainly splitting lock cushioning plunger 10.
It is partially schematic in combined floodgate cushion collar through-hole that Fig. 6 is that combined floodgate buffer plunger first stage cylindrical surface of the present invention moves to
Figure includes mainly connector sleeve 4, combined floodgate cushion collar 6, working cylinder cylinder body 7, combined floodgate buffer plunger 8 and piston 9.
It is partially schematic in combined floodgate cushion collar through-hole that Fig. 7 is that combined floodgate buffer plunger second stage circular conical surface of the present invention moves to
Figure includes mainly connector sleeve 4, rod chamber hydraulic fluid port 5, combined floodgate cushion collar 6, working cylinder cylinder body 7, combined floodgate buffer plunger 8 and piston
9。
It is partially schematic in combined floodgate cushion collar through-hole that Fig. 8 is that combined floodgate buffer plunger phase III cylindrical surface of the present invention moves to
Figure includes mainly connector sleeve 4, rod chamber hydraulic fluid port 5, combined floodgate cushion collar 6, working cylinder cylinder body 7, combined floodgate buffer plunger 8 and piston
9。
Fig. 9 is the structural schematic diagram of combined floodgate buffer plunger of the present invention, includes mainly combined floodgate buffer plunger 8.
Working principle of the present invention is as follows：
As shown in Figure 1, when high-voltage circuitbreaker executes sub-switching operation, hydraulic working cylinder high speed piston moves right, when piston will
When moving to stroke terminal, splitting lock cushioning plunger enters splitting lock cushioning set, and the hydraulic oil in rodless cavity II must pass through at this time
The gap formed between splitting lock cushioning outer plunger surface and splitting lock cushioning set inner surface could be discharged by rodless cavity hydraulic fluid port；Work as height
When voltage breaker executes closing operation, hydraulic working cylinder high speed piston moves downward, when piston will move to stroke terminal,
Combined floodgate buffer plunger enters combined floodgate cushion collar, at this time the hydraulic oil in rod chamber I must by combined floodgate buffer plunger outer surface with
The gap formed between combined floodgate cushion collar inner surface could be discharged by rod chamber hydraulic fluid port, to increase oil return resistance, make work
Filling in speed reduces.
As shown in Fig. 2, Fig. 3, Fig. 4 and Fig. 5, since the splitting lock cushioning set of this novel hydraulic working cylinder uses cylindrical surface-circle
The structure of the conical surface-Cylinder Combination, during piston moves right, splitting lock cushioning plunger undergoes three course movements to splitting lock cushioning
It covers in through-hole：As splitting lock cushioning plunger l1When part is entered in splitting lock cushioning set, oil extraction gap is up to δmax, work as splitting lock cushioning
Plunger l2When part is entered in splitting lock cushioning set, oil extraction gap is gradually reduced, and wherein circular conical surface and plane included angle are α, work as separating brake
Buffer plunger l3When part is entered in splitting lock cushioning set, the minimum δ in oil extraction gapmin。
As shown in Fig. 6, Fig. 7, Fig. 8 and Fig. 9, since the combined floodgate cushion collar of this novel hydraulic working cylinder uses cylindrical surface-circle
The structure of the conical surface-Cylinder Combination, during piston is moved to the left, combined floodgate buffer plunger undergoes three course movements and is buffered to closing a floodgate
It covers in through-hole：As combined floodgate buffer plunger l’ 1When part is entered in combined floodgate cushion collar, oil extraction gap is up to δ’ max, buffered when closing a floodgate
Plunger l’ 2When part is entered in combined floodgate cushion collar, oil extraction gap is gradually reduced, and wherein circular conical surface and plane included angle are α’, work as combined floodgate
Buffer plunger l’ 3When part is entered in combined floodgate cushion collar, the minimum δ in oil extraction gap’ min。
The buffer plunger structure of combination so that it is possessed surge pressure is low, the short feature of braking time, and with preferable
Centring property avoids the buffer invalidation caused by misaligning, and cavity pressure is pulsed when reducing buffering so that buffering course is more
Steadily, good buffer effect, while difficulty of processing is reduced again.
Claims (2)
1. a kind of novel high-voltage circuit-breaker hydraulic working cylinder with combined buffer plunger, it is characterised in that including：Piston rod
(1), left pressing plate (2), guide sleeve (3), connector sleeve (4), rod chamber hydraulic fluid port (5), combined floodgate cushion collar (6), working cylinder cylinder body (7),
Combined floodgate buffer plunger (8), piston (9), splitting lock cushioning plunger (10), splitting lock cushioning set (11), rodless cavity hydraulic fluid port (12) and the right side
Pressing plate (13)；It is machined with circular through hole among left pressing plate (2), piston rod (1) is matched with left pressing plate (2) circular through hole internal surface gaps
It closes；Left pressing plate (2) is fixedly connected with working cylinder cylinder body (7) by screw；It is machined with circular through hole, piston among guide sleeve (3)
Bar (1) coordinates with guide sleeve (3) circular through hole internal surface gaps, and is sealed by a seal ring；Guide sleeve (3) left end and a left side
Pressing plate (2) contact positioning, right end contacts positioning with connector sleeve (4), and connect progress with left pressing plate (2) by positioning pin and circumferentially determine
Position；Circular through hole is machined among connector sleeve (4), piston rod (1) coordinates with connector sleeve (4) circular through hole internal surface gaps；Even
Female connector (4) outer surface coordinates with working cylinder cylinder body (7) internal surface gaps, and is sealed by a seal ring；Connector sleeve (4) left end
Contact positioning with guide sleeve (3), right end contacts positioning with combined floodgate cushion collar (6), and connect with guide sleeve (3) by positioning pin into
Row is circumferentially positioned；Combined floodgate cushion collar (6) left end contacts positioning with connector sleeve (4), and right end is positioned with working cylinder cylinder body (7) step；
Piston rod (1) surface is machined with combined floodgate buffer plunger (8)；Match with working cylinder cylinder body (7) internal surface gaps piston (9) outer surface
It closes, and is sealed by a seal ring；Circular through hole, piston rod (1) and piston (9) circular through hole are machined among piston (9)
Internal surface gaps coordinate, and piston (9) left end is positioned with piston rod (1) step；Piston rod (1) right end is machined with external screw thread, separating brake
Buffer plunger (10) is machined with internal thread, and piston (9) right end is fastened by splitting lock cushioning plunger (10) and positioned；Splitting lock cushioning plunger
(10) loosened by positioning pin；Splitting lock cushioning set (11) left end is positioned with working cylinder cylinder body (7) step, right end and right pressing plate (13)
Contact positioning；Right pressing plate (13) is fixedly connected with working cylinder cylinder body (7) by screw, and is sealed by a seal ring；Work as height
When voltage breaker executes sub-switching operation, hydraulic the cylinder piston (9) moves right at a high speed, when piston (9) will move to stroke
When terminal, splitting lock cushioning plunger (10) enters splitting lock cushioning set (11), and the hydraulic oil in rodless cavity II must pass through separating brake at this time
It the gap formed between buffer plunger (10) outer surface and splitting lock cushioning set (11) inner surface could be by rodless cavity hydraulic fluid port (12)
Discharge；When high-voltage circuitbreaker executes closing operation, hydraulic the cylinder piston (9) moves downward at a high speed, when piston (9) will be transported
When moving stroke terminal, combined floodgate buffer plunger (8) enters combined floodgate cushion collar (6), and the hydraulic oil in rod chamber I must pass through at this time
It the gap formed between combined floodgate buffer plunger (8) outer surface and combined floodgate cushion collar (6) inner surface could be by rod chamber hydraulic fluid port (5)
Discharge；To increase oil return resistance, make the reduction of piston (9) speed；Simultaneously as the cushion collar of this novel hydraulic working cylinder is adopted
With the structure of cylindrical surface-circular conical surface-Cylinder Combination, so that it is possessed, surge pressure is low, the short feature of braking time, and has
Preferable centring property avoids the buffer invalidation caused by misaligning, and cavity pressure is pulsed when reducing buffering so that buffered
Cheng Gengjia is steady, good buffer effect, while reducing difficulty of processing again.
2. a kind of novel high-voltage circuit-breaker hydraulic working cylinder with combined buffer plunger according to claim 1,
It is characterized in that：Cavity between combined floodgate cushion collar (6) right side, working cylinder cylinder body (7) inner surface and piston (9) left side is formed
Rod chamber I；Cavity between piston (9) right side, working cylinder cylinder body (7) inner surface and splitting lock cushioning set (11) left side is formed
Rodless cavity II.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810197860.7A CN108317124A (en) | 2018-03-11 | 2018-03-11 | A kind of novel high-voltage circuit-breaker hydraulic working cylinder with combined buffer plunger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810197860.7A CN108317124A (en) | 2018-03-11 | 2018-03-11 | A kind of novel high-voltage circuit-breaker hydraulic working cylinder with combined buffer plunger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108317124A true CN108317124A (en) | 2018-07-24 |
Family
ID=62901374
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810197860.7A Pending CN108317124A (en) | 2018-03-11 | 2018-03-11 | A kind of novel high-voltage circuit-breaker hydraulic working cylinder with combined buffer plunger |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108317124A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110159610A (en) * | 2019-04-26 | 2019-08-23 | 平高集团有限公司 | The plug and hydraulic device working cylinder of hydraulic device working cylinder |
| CN110159615A (en) * | 2019-04-26 | 2019-08-23 | 平高集团有限公司 | The working cylinder of cushion collar and the hydraulic device using the cushion collar |
| CN110242640A (en) * | 2019-04-26 | 2019-09-17 | 平高集团有限公司 | The working cylinder and hydraulic actuating mechanism of cushion collar, hydraulic device |
| CN110242639A (en) * | 2019-04-26 | 2019-09-17 | 平高集团有限公司 | A kind of hydraulic device working cylinder and its plug |
| CN110571107A (en) * | 2019-07-25 | 2019-12-13 | 平高集团有限公司 | Hydraulic operating mechanism and circuit breaker |
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| CN110159615A (en) * | 2019-04-26 | 2019-08-23 | 平高集团有限公司 | The working cylinder of cushion collar and the hydraulic device using the cushion collar |
| CN110242640A (en) * | 2019-04-26 | 2019-09-17 | 平高集团有限公司 | The working cylinder and hydraulic actuating mechanism of cushion collar, hydraulic device |
| CN110242639A (en) * | 2019-04-26 | 2019-09-17 | 平高集团有限公司 | A kind of hydraulic device working cylinder and its plug |
| CN110159610B (en) * | 2019-04-26 | 2020-11-06 | 平高集团有限公司 | Plug of hydraulic device working cylinder and hydraulic device working cylinder |
| CN110571107A (en) * | 2019-07-25 | 2019-12-13 | 平高集团有限公司 | Hydraulic operating mechanism and circuit breaker |
| CN110571107B (en) * | 2019-07-25 | 2021-07-23 | 平高集团有限公司 | Hydraulic operating mechanism and circuit breaker |
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