DE112017000009T5 - Electrohydraulic servo amplifier cylinder - Google Patents

Electrohydraulic servo amplifier cylinder

Info

Publication number
DE112017000009T5
DE112017000009T5 DE112017000009.2T DE112017000009T DE112017000009T5 DE 112017000009 T5 DE112017000009 T5 DE 112017000009T5 DE 112017000009 T DE112017000009 T DE 112017000009T DE 112017000009 T5 DE112017000009 T5 DE 112017000009T5
Authority
DE
Germany
Prior art keywords
pressure
oil
electrohydraulic servo
piston rod
oil chamber
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
DE112017000009.2T
Other languages
German (de)
Inventor
Keqin Li
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huizhou Kete Measure&control Eng Co Ltd
Huizhou Kete Measure&control Engineering Co Ltd
Original Assignee
Huizhou Kete Measure&control Eng Co Ltd
Huizhou Kete Measure&control Engineering Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huizhou Kete Measure&control Eng Co Ltd, Huizhou Kete Measure&control Engineering Co Ltd filed Critical Huizhou Kete Measure&control Eng Co Ltd
Priority to PCT/CN2017/081284 priority Critical patent/WO2018191920A1/en
Publication of DE112017000009T5 publication Critical patent/DE112017000009T5/en
Pending legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B3/00Intensifiers or fluid-pressure converters, e.g. pressure exchangers; Conveying pressure from one fluid system to another, without contact between the fluids

Abstract

The present invention provides an electro-hydraulic servo-amplifier cylinder comprising a body of the electrohydraulic servo-amplifier cylinder, wherein a thrust oil chamber and a second pressure boost oil chamber are sequentially disposed on the pressure boost oil passage of the body of the electro-hydraulic servo-boosting cylinder, and wherein the invention further comprises a pressure relief valve, and wherein the pressure relief valve second pressure boost oil chamber is connected. By the in-line amplification means, the pressure intensifier oil passage of the present invention performs a gradual reinforcement for the oil fluid, the pressure relief valve is connected to a low-pressure oil chamber and a high-pressure oil chamber, in operation there is a rapid pressure relief, at the same time by means of the thrust force of the return oil liquid, the piston of the low-pressure oil chamber to the return pushed so that a short turnaround time and good efficiency exist; a limit switch is arranged to monitor and thus protect the positions of the priming piston rod and the reinforcing piston rod, at the same time premature acceleration and deceleration are performed, thereby shortening the duty cycle; with the arrangement of the oil filling cup the lost oil liquid is added in time, by the oil filling cup is automatically skipped, thereby the volume and the quality of the oil liquid in the oil cup can be easily observed, while the operator can be informed on a timely addition or replacement of the oil liquid, to it

Description

  • Technical area
  • The present invention relates to the field of the booster cylinder, in particular to an electrohydraulic servo booster cylinder.
  • State of the art
  • With the technical development, the use of the pressure booster devices in the production is becoming more widespread.
  • In the current hydro-pneumatic booster cylinders, pressure boosting is realized mainly by pressing for the oil fluid, and the above hydro-pneumatic booster cylinders have the following shortcomings:
  1. 1. There is a break in the return, with a long turnaround time and poor work efficiency;
  2. 2. Only after a complete return of the pressure booster piston rod, the pressure of the oil fluid can be reduced to the output pressure, there is a long pressure reduction time;
  3. 3. In use, loss of oil liquid will occur, thereby generating the air, with the passage of time, the pressure boosting performance gradually deteriorates;
  4. 4. In operation, there is a high pressure inside the pressure booster chamber, while the pressure relief is difficult;
  5. 5. The large-tonnage hydro-pneumatic booster cylinder has a high air consumption, polluting the air, which is not conducive to the protection of the atmosphere environment.
  • The above defects are to be improved.
  • Content of the invention
  • In order to overcome the above shortcomings, the present invention provides an electrohydraulic servo-booster cylinder which has a short return time and a rapid pressure reduction, and which does not suffer from the loss of the oil-liquid, which is small in comparison with the hydro-pneumatic booster cylinder Noise and no air pollution will cause, and wherein the present invention is environmentally friendly and energy-efficient and the materials can be easily obtained.
  • The present invention is realized by the following technical measure: an electro-hydraulic servo-amplifier cylinder comprising a body of the electrohydraulic servo-amplifier cylinder, wherein a thrust oil chamber and a second pressure boost oil chamber are successively arranged on the pressure boost oil passage of the electrohydraulic servo-power cylinder body, and wherein the invention further comprises a pressure relief valve, and wherein the pressure relief valve is connected to the second pressure boost oil chamber. Preferably, the body of the electrohydraulic servo amplifier cylinder further comprises a pre-winding servo motor, a bearing seat, a clutch, a lead screw, a ball screw pair, a priming piston rod, a forward end cap, and a forward piston; wherein the pre-winding servomotor is arranged on the bearing seat and connected via the coupling to the pre-screw; and wherein the lead screw is connected to the ball screw pair; and wherein the ball screw pair is fixedly connected to the pre-coil piston rod; and wherein the pre-spool piston rod is for driving the pre-spool piston; and wherein the prefeed front end cap is connected to the other end of the bearing seat. Preferably, the body of the electrohydraulic servo-amplifier cylinder further comprises an excitation servomotor, a transmission, a clutch, a boosting support band accumulator, a ball screw pair, a reinforcement screw, a boost piston rod, and an excitation piston rod; wherein the excitation servomotor is connected to the transmission; and wherein the transmission is disposed on the reinforcing backbone storage and connected via the coupling to the reinforcing screw; and wherein the reinforcing bolt is connected to the ball screw pair; and wherein the ball screw pair is fixedly connected to the reinforcing piston rod; and wherein the boost piston rod is fixedly connected to the excitation piston rod.
  • Preferably, the pressure relief valve comprises a support member, a drive means, a lever means and a valve, wherein the drive means by the lever means a pushing force, and wherein the lever means is a labor-saving means, and wherein the support point of the lever means is arranged on the support member, and wherein the valve a valve body and a valve ball, and wherein the valve body is connected to the support member, and wherein the interior of the valve body comprises a connection chamber, a spring means and a push rod means, and wherein the connection chamber comprises an oil inlet opening and an oil outlet opening, and wherein one end of the spring means is firmly supported by the valve body, and wherein the other end of the spring means contacts the valve ball, and wherein one end of the push rod means a the force and the other end of the push rod means passes through the oil outlet opening and the valve ball touches and wherein the valve ball is located within the connecting chamber, and wherein under action of the spring force of the compression spring of the spring means and the thrust of the push rod means the valve ball the Oil outlet opens or closes. Preferably, the pintle chamber further comprises a first pressure oil outlet port, the second pressure intensifier oil chamber further comprising a first pressure oil inlet port and a second pressure oil outlet port, and wherein the first pressure oil outlet port and the first pressure oil inlet port are interconnected by a first pressure boost oil passage, and wherein the first pressure oil inlet port is closed when the first pressure oil inlet port second pressure boosting oil chamber is used for pressure boosting, and wherein the pressure relief valve comprises an oil inlet hole and an oil outlet hole, and wherein the oil inlet hole is connected to the second pressure boost oil chamber, and wherein the oil outlet hole is connected to the thrust oil chamber.
  • Preferably, the oil outlet hole is connected to the first pressure boost oil passage. Preferably, the body of the electrohydraulic servo amplifier cylinder further comprises a limit switch, the limit switch being used respectively for limiting the forward piston rod and the boost piston rod of the electrohydraulic servo amplifier cylinder body.
  • Preferably, the present invention further comprises a Ölfüllbecher, wherein the Ölfüllbecher is connected via a one-way valve with the thrust oil chamber. Preferably, the bottom portion of the Ölfüllbechers is higher than the upper part of the thrust oil chamber.
  • Preferably, the second pressure boost oil chamber is further connected to a pressure sensor.
  • The present invention has the following advantages: by the in-line boosting device, the pressure boosting oil passage of the present invention performs a gradual reinforcement for the oil liquid, the pressure relief valve is connected to a low pressure oil chamber and a high pressure oil chamber, in operation there is a rapid pressure release, at the same time by means of the thrust the return oil liquid of the pistons of the low-pressure oil chamber pushed to the return, so that a short return time and good efficiency exist, in operation, there is no emission of the exhaust gases, so that the invention is energy-saving and environmentally friendly; a limit switch is arranged to monitor and thus protect the positions of the priming piston rod and the reinforcing piston rod, at the same time premature acceleration and deceleration are performed, thereby shortening the cycle of operation; with the arrangement of Ölfüllbechers the lost oil liquid can be added in time, through the Ölfüllbecher the air is automatically discharged, thereby the volume and the quality of the oil liquid in the oil cup can be easily observed, while the operating staff pointed out a timely addition or replacement of the oil fluid in order to avoid that, due to the lack of oil or a problem of oil quality, a failure of the engine with deterioration of performance and abnormal heat generation, etc. occurs.
  • list of figures
  • In the context of figures and detailed embodiments, the present invention will be explained in more detail below.
    • 1 shows a schematic structural view of an embodiment of the present invention.
    • 2 shows a schematic structural view of the body of the electro-hydraulic servo amplifier cylinder.
    • 3 shows a schematic structural view of the pressure relief valve in an embodiment of the present invention.
  • LIST OF REFERENCE NUMBERS
  • 1
    Fast forward servomotor
    2
    clutch
    3
    Ball screw pair
    4
    Return oil chamber
    5
    Forward-piston
    6
    Boost oil chamber
    7
    manometer
    8th
    Return oil chamber
    9
    Excitement pushrod
    10
    Arousal oil chamber
    11
    Energizing piston rod
    12
    Ball screw pair
    13
    clutch
    14
    transmission
    15
    Excitement servomotor
    16
    bearing seat
    17
    Forward-piston rod
    18
    Vorspulenschraube
    19
    Forward-Vorderendkappe
    20
    Oil passage connecting device
    21
    Operating piston rod
    22
    Gain support tape storage
    23
    Reinforcing rod
    24
    Reinforcement screw
    25
    limit switch
    30
    Pressure relief valve
    310
    casing
    311
    Electromagnetic coil
    312
    Valve core screw
    313
    lever
    314
    shaft pin
    315
    shear wave
    316
    pusher head
    317
    Pressure relief chamber
    32
    valve ball
    33
    Connecting chamber, closing device
    341
    casing
    342
    feather
    343
    pusher head
    36
    Oil return pipe
    40
    Ölfüllbecher
    41
    one-way valve
    84
    Oil return pipe
  • Detailed embodiments
  • Hereinafter, the technical solutions in the embodiment of the present invention will be clearly and completely explained. Obviously, the illustrated embodiments are not all embodiments but only part of embodiments of the present invention. All other embodiments obtained by one of ordinary skill in the art based on the embodiments in the present invention without creative work are to be considered as within the scope of the present invention.
  • As in 1 As shown, the electro-hydraulic servo-amplifier cylinder includes a pre-coil amplifying means, an energizing and amplifying means, an oil passage connecting device, and a pressure output device; as in 2 In the present invention, an improvement is performed on the pre-coil amplifying means, the energizing and amplifying means, and the oil channel connecting apparatus of the body of the electro-hydraulic servo-booster cylinder.
  • In the pre-coil amplifying means, the pre-winding servomotor is 1 by a connecting element on the upper part of the bearing seat 16 installed, inside the bearing seat 16 is its rotary shaft through the clutch 2 with the feed screw 18 connected; the feed screw 18 is with the ball screw pair 3 connected, the ball screw pair 3 can along the external thread on the feeder screw 18 with the course of the forward and reverse rotation of the pre-winding servomotor 1 to realize an upward and downward movement; the ball screw pair 3 is with the fast-forward piston rod 17 firmly connected, the ball screw pair 3 drives the feed piston rod 17 to an upward and downward movement to the forward plunger 5 to drive to the movement, at the top of the feed-piston rod 17 a stopper is disposed on the surface of the outer periphery of the bearing seat 16 is a limit switch 25 arranged, with the arrangement, the moving position of the feed-piston rod 17 monitors, thereby triggering a start and stop signal to the forward piston rod 17 At the same time a premature acceleration and deceleration is realized to shorten the Hinlauf- and return time. The lower part of the bearing seat 16 is through a fast-forward front end cap 19 connected to the top of the pre-coil boost cylinder, inside the pre-coil boost cylinder is the pre-charge piston 5 in the thrust oil chamber 6 arranged to press the oil liquid to perform a first stage reinforcement; at the top of the pre-coil boost cylinder is the thrust oil chamber 6 through a one-way valve 41 with the oil filling cup 40 connected, the oil liquid inside the Ölfüllbechers 40 can to the thrust oil chamber 6 flow, the air is through the Ölfüllbecher 40 automatically skipped; Preferably, the bottom portion of the oil liquid inside the Ölfüllbechers 40 higher than the top of the thrust oil chamber 6 ,
  • Since in the excitation and amplification device of the pre-spool piston 5 the oil fluid to the excitation oil chamber 5 pushes, the fast-forward piston moves 5 down and thus touched a workpiece. The manometer 7 connected digital pressure sensor triggers the signal, the excitation servo motor 15 works, the excitation servo motor 15 is with the gearbox 14 connected, the transmission 14 is with the clutch 13 connected, the clutch 13 is with the reinforcement screw 24 connected, the reinforcement screw 24 extends into the reinforcing backbone storage 22 and is with the excitement piston rod 11 connected, the excitement piston rod 11 can with the course of rotation of the excitation servo motor 15 realize an upward and downward movement, the transmission 14 slows down the excitation servo motor 15 and improves its reinforcing effect with the manometer 7 Connected digital pressure sensor monitors a start and closing signal to the oil pressure triggering of the excitation oil chamber 10 , at the top of the reinforcement piston rod 23 a stopper member is disposed on the surface of the outer periphery of the reinforcing support band storage 22 is a limit switch 25 arranged, with the arrangement, the movement position of the reinforcing piston rod 23 monitors, thereby triggering a start and stop signal to the boost piston rod 23 At the same time a premature acceleration and deceleration is realized to shorten the Hinlauf- and return time.
  • The lower part of the pre-winding reinforcing cylinder and the lower part of the reinforcing support band memory 22 are each at the top of the oil passage connecting device 20 sealingly connected to the pressure boosting oil passage inside the oil passage connecting device 20 is an excitation oil chamber 10 and the pressure boost oil passage of the excitation oil chamber 10 is extended, the upper part of the excitation oil chamber 10 is the rod outlet opening of the excitation piston rod 11 which is the upper part of the excitation oil chamber 10 approximate side portion is with the bottom portion of the thrust oil chamber 6 connected, in operation, the excitation piston rod extends 11 into the arousal oil chamber 10 the pressure oil inlet port in the thrust oil chamber connected to the side portion is closed to further strengthen the oil fluid in the excitation oil chamber. To a point of the excitation oil chamber approaching the lower part 10 is a pressure relief valve 30 connected.
  • As in 3 illustrated, includes the pressure relief valve 30 an opening device and a closing device, in the opening device is in the interior of the housing 310 a solenoid valve is fixed, at the connection realizes the electromagnetic coil 311 by a variation of the magnetic field, the change in length of the valve core 312 , the head portion of the valve core 312 is at one end of the lever 313 connected, the shaft pin 314 can rotate on the lever 313 be connected and serve as its base, the other end of the lever 313 pushes through a ball bead the shear wave 315 and the pusher head 316 , the shearhead 316 is located inside the connecting element, in the connecting element is a pressure relief chamber 317 arranged, the pusher head 316 goes through the pressure relief chamber 317 through and can protrude from the connecting element. The locking device is connected to the connecting element, at the junction is a connecting chamber 33 arranged, the head section of the pusher head 316 may extend into the connecting chamber, inside the housing 341 the locking device are a spring 342 and a pusher head 343 arranged, under the action of the spring 342 may be the head section of the pusher head 343 yourself in the connection chamber 33 extend, the valve ball 32 is located in the connection chamber 33 , the shearhead 316 and the pusher head 343 can back and forth the valve ball 32 push the valve ball 32 can the protruding opening of the pusher head 316 seal; in terms of the shapes of the pusher head 316 and the pusher head 343 the head portion preferably has a cylindrical shape, the center portion is conical, and the bottom portion is cylindrical; preferred are the push head 316 and the pusher head 343 are arranged with respect to the same central axis. The connection chamber 33 is with the excitement oil chamber 10 connected to the side of the connection chamber 33 Located connecting portion is preferably in the vicinity of the pusher head 343 ; the connection chamber 33 is through the oil return pipe 36 with the bottom portion of the thrust oil chamber 6 connected, preferably, the connecting chamber with the oil passage for connecting the thrust oil chamber 6 and the excitation oil chamber 10 connected.
  • The excitation servo motor 15 rotates forward, the ball screw pair 12 pushes the excitement piston rod 11 for forward movement, in the pressure relief, the solenoid valve is started, the lever 313 pushes the shear wave 315 and the pusher head 316 , the pushing head pushes and opens the valve ball 32 in the sealed connection chamber 33 , the pressure oil of the excitation oil chamber 10 enters the pressure relief chamber 317 after buffering by the pressure relief chamber 317 the oil liquid flows through the oil return pipe 36 directly into the thrust oil chamber 6 back; At the same time, the pre-winding servo motor is rotating 1 and the excitation servo motor 15 backwards, the ballscrew pairs 3 and 12 each pull the piston 5 and the excitement piston rod 11 to return to the starting position.
  • The lower part of the oil channel connecting device 20 is connected to the pressure output device, the pressure gauge 7 Used to indicate the oil pressure in the excitation oil chamber 10 , Inside the pressure device separates the operating piston rod 21 the excitation oil chamber 10 and the reflux oil chamber 8th from each other, the bottom portion of the return oil chamber 8th is through the oil return pipe 84 with the return oil chamber 4 connected. After a quick release of pressure through the pressure relief valve 30 becomes the return time of the service piston rod 21 also shortened.
  • With respect to the preload pressure of the electrohydraulic servo-amplifier cylinder according to the present invention, the desired pressure is selected by an intelligent controller, in terms of the boost pressure, the boost pressure is also selected by the intelligent controller, by the transmission of the transmission, the excitation servomotor realizes an ultra-pressure boost. Since the excitation oil chamber has a high pressure, the valve ball can not be opened with a conventional pressure relief valve. In the electrohydraulic servo-amplifier cylinder, a pressure relief valve is specifically designed by means of the leverage effect, thereby the thrust force can be increased to smoothly push the valve ball, thereby quickly realizing a pressure release to increase the return velocity of the oil fluid.
  • In summary, the above contents are only preferred embodiments of the technical solution of the present invention, the scope of the present invention is not limited thereto. All changes, equivalent substitutions and improvements made in accordance with the principles and principles of the present invention should be considered to be within the scope of the present invention.
  • Claims (10)

    1. An electro-hydraulic servo-amplifier cylinder comprising a body of the electrohydraulic servo-amplifier cylinder, wherein a thrust oil chamber and a second pressure boost oil chamber are sequentially disposed on the pressure boost oil passage of the electrohydraulic servo-power cylinder body, characterized in that the invention further comprises a pressure relief valve, the pressure relief valve being connected to the second pressure boost oil chamber.
    2. Electrohydraulic servo amplifier cylinder after Claim 1 characterized in that the body of the electrohydraulic servo amplifier cylinder further comprises a pre-winding servomotor, a bearing seat, a clutch, a priming screw, a ball screw pair, a priming piston rod, a forward end cap, and a forward piston; wherein the pre-winding servomotor is arranged on the bearing seat and connected via the coupling to the pre-screw; and wherein the lead screw is connected to the ball screw pair; and wherein the ball screw pair is fixedly connected to the pre-coil piston rod; and wherein the pre-spool piston rod is for driving the pre-spool piston; and wherein the prefeed front end cap is connected to the other end of the bearing seat.
    3. Electrohydraulic servo amplifier cylinder after Claim 1 characterized in that the body of the electrohydraulic servo amplifier cylinder further comprises an excitation servo motor, a transmission, a clutch, a boosting support band accumulator, a ball screw pair, a boost screw, a boost piston rod, and an excitation piston rod; wherein the excitation servomotor is connected to the transmission; and wherein the transmission is disposed on the reinforcing backbone storage and connected via the coupling to the reinforcing screw; and wherein the reinforcing bolt is connected to the ball screw pair; and wherein the ball screw pair is fixedly connected to the reinforcing piston rod; and wherein the boost piston rod is fixedly connected to the excitation piston rod.
    4. Electrohydraulic servo amplifier cylinder after Claim 1 characterized in that the pressure relief valve comprises a support member, a drive means, a lever means and a valve, the drive means exerting a thrust force by the lever means, and wherein the lever means is a labor-saving means, and wherein the fulcrum of the lever means is arranged on the support member, and wherein the valve comprises a valve body and a valve ball, and wherein the valve body is connected to the support member, and wherein the interior of the valve body comprises a connection chamber, a spring means and a push rod means, and wherein the connection chamber comprises an oil inlet opening and an oil outlet opening, and wherein one end of the spring means is fixedly supported by the valve body, and the other end of the spring means contacts the valve ball, and one end of the push rod means is a force applying end of the lever means, and the other end of the push and the valve ball is located within the connecting chamber, and wherein under the action of the spring force of the compression spring of the spring means and the thrust of the push rod means, the valve ball opens or closes the oil outlet opening.
    5. Electrohydraulic servo amplifier cylinder after Claim 1 characterized in that the pusher piston chamber further comprises a first pressure oil outlet port, the second pressure boost oil chamber further comprising a first pressure oil inlet port and a second pressure oil outlet port, and wherein the first pressure oil outlet port and the first pressure oil inlet port communicate with each other through a first pressure boost oil passage and wherein the first pressure oil inlet port is closed when the second pressure boost oil chamber is used for pressure boosting, and wherein the pressure relief valve includes an oil inlet hole and an oil outlet hole, and wherein the oil inlet hole is connected to the second pressure boost oil chamber, and the oil outlet hole is connected to the thrust oil chamber is.
    6. Electrohydraulic servo amplifier cylinder after Claim 5 characterized in that the oil outlet hole is connected to the first pressure boosting oil passage.
    7. Electrohydraulic servo amplifier cylinder after Claim 1 characterized in that the body of the electrohydraulic servo amplifier cylinder further comprises a limit switch, the limit switch being used respectively for limiting the pre-coil piston rod and the boost piston rod of the electrohydraulic servo amplifier cylinder body.
    8. Electrohydraulic servo amplifier cylinder after Claim 1 , characterized in that the present invention further comprises a Ölfüllbecher, wherein the Ölfüllbecher is connected via a one-way valve with the thrust oil chamber.
    9. Electrohydraulic servo amplifier cylinder after Claim 8 , characterized in that the bottom portion of the Ölfüllbechers is higher than the upper part of the thrust oil chamber.
    10. Electrohydraulic servo amplifier cylinder after Claim 1 , characterized in that the second pressure boost oil chamber is further connected to a pressure sensor.
    DE112017000009.2T 2017-04-20 2017-04-20 Electrohydraulic servo amplifier cylinder Pending DE112017000009T5 (en)

    Priority Applications (1)

    Application Number Priority Date Filing Date Title
    PCT/CN2017/081284 WO2018191920A1 (en) 2017-04-20 2017-04-20 Electro-hydraulic servo booster cylinder

    Publications (1)

    Publication Number Publication Date
    DE112017000009T5 true DE112017000009T5 (en) 2019-03-21

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    ID=60497817

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    DE112017000009.2T Pending DE112017000009T5 (en) 2017-04-20 2017-04-20 Electrohydraulic servo amplifier cylinder

    Country Status (3)

    Country Link
    CN (1) CN107454928B (en)
    DE (1) DE112017000009T5 (en)
    WO (1) WO2018191920A1 (en)

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    Publication number Priority date Publication date Assignee Title
    CN107454928B (en) * 2017-04-20 2019-12-17 惠州市科特测控工程有限公司 Electro-hydraulic servo boosting cylinder

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    JP2581969B2 (en) * 1988-09-27 1997-02-19 日信工業株式会社 Fluid pressure booster
    CN2913756Y (en) * 2006-06-28 2007-06-20 耿爱军 High-pressure relief valve
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    CN107454928A (en) 2017-12-08
    WO2018191920A1 (en) 2018-10-25
    CN107454928B (en) 2019-12-17

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