CN107387810A - The machine feedback formula Numeric hydraulic cylinder that a kind of valve pocket can be servo-actuated - Google Patents
The machine feedback formula Numeric hydraulic cylinder that a kind of valve pocket can be servo-actuated Download PDFInfo
- Publication number
- CN107387810A CN107387810A CN201710771383.6A CN201710771383A CN107387810A CN 107387810 A CN107387810 A CN 107387810A CN 201710771383 A CN201710771383 A CN 201710771383A CN 107387810 A CN107387810 A CN 107387810A
- Authority
- CN
- China
- Prior art keywords
- valve
- screw
- valve pocket
- valve element
- ball
- 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
Links
- 230000008878 coupling Effects 0.000 claims description 5
- 238000010168 coupling process Methods 0.000 claims description 5
- 238000005859 coupling reaction Methods 0.000 claims description 5
- 239000003921 oil Substances 0.000 description 10
- 238000000034 method Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
- F16K11/02—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit
- F16K11/06—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements
- F16K11/065—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/30—Details
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/30—Details
- F16K3/314—Forms or constructions of slides; Attachment of the slide to the spindle
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/04—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
- F16K31/122—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/44—Mechanical actuating means
- F16K31/50—Mechanical actuating means with screw-spindle or internally threaded actuating means
- F16K31/502—Mechanical actuating means with screw-spindle or internally threaded actuating means actuating pivotable valve members
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Electrically Driven Valve-Operating Means (AREA)
- Servomotors (AREA)
- Actuator (AREA)
Abstract
The present invention discloses the machine feedback formula Numeric hydraulic cylinder that a kind of valve pocket can be servo-actuated, its servomotor spindle is connected with screw rod, the screw-internal thread fit of the screw rod other end and valve element, valve element is in valve pocket, screw rod band movable valve plug slides axially along valve pocket, valve pocket is in valve body, valve element lateral wall is provided with multiple boss, valve pocket madial wall is provided with the groove corresponding with valve element boss, valve element and valve pocket, which coordinate, forms three-position four-way hydraulic valve, body wall is radially provided with the oil circuit through hole corresponding with three-position four-way hydraulic valve, valve pocket coordinates in the external screw thread that internal thread and ball-screw are provided with close to cylinder body end, valve pocket can slide axially under ball-screw drive along valve body, the ball-screw other end is flush-mounted in hollow piston rod, feed screw nut is arranged on the piston of piston rod.The present invention adds housing configuration on the outside of valve element, by the servo-actuated position dynamical feedback for realizing hydraulic cylinder of valve pocket, so as to be disconnected the mechanical attachment of valve element and ball-screw, improves the controllability of valve element.
Description
Technical field
The present invention relates to digital hydraulic technical field, and in particular to the machine feedback formula digital hydraulic that a kind of valve pocket can be servo-actuated
Cylinder.
Background technology
Traditional Numeric hydraulic cylinder is divided into the valve core movement of step/servo motor direct drive and control hydraulic valve substantially,
It is equipped with the machine feedback structure that ball-screw is directly connected to valve element, it is possible to achieve Direct Digital signal controls, and can reach
0.01mm position control accuracy.But because valve element one end couples with the output shaft of step/servo motor, the other end and liquid
The ball-screw connection of cylinder pressure, both ends can be simultaneously by the motive force of step/servo motor and the feedback forces of ball-screw, complete
It is not easy to realize the Dynamic Matching of motive force and feedback force in work period, have impact on the dynamic response of valve element and hydraulic cylinder, also deposit
In failure hidden danger.
The content of the invention
Problem being present for above-mentioned, the present invention proposes the machine feedback formula digital hydraulic cylinder structure that a kind of valve pocket can be servo-actuated,
The two of Numeric hydraulic cylinder valve element can be solved to the problem that connects firmly, fundamentally improve the stressing conditions of valve element, so that valve element is transported
Dynamic performance is improved.
The technical solution adopted for the present invention to solve the technical problems is：The machine feedback formula numeral that a kind of valve pocket can be servo-actuated
Hydraulic cylinder, including servomotor, screw rod, valve element, valve pocket, valve body, ball-screw, feed screw nut, piston rod, cylinder body, servo electricity
The main shaft of machine is connected by shaft coupling with screw rod one end, and the screw rod other end is engaged with the internal thread of valve element, and valve element is flush-mounted in valve
In set, screw rod can slide axially with movable valve plug along valve pocket, and for valve pocket in valve body, the lateral wall of valve element is provided with multiple boss,
The madial wall of valve pocket is provided with the groove corresponding with the boss of valve element, and valve element and valve pocket, which coordinate, forms three-position four-way hydraulic valve, valve
Body sidewall is radially provided with the oil circuit through hole corresponding with three-position four-way hydraulic valve, and valve pocket is being provided with internal thread and rolling close to cylinder body end
The external screw thread of ballscrew one end is engaged, and valve pocket can slide axially under ball-screw drive along valve body, the ball-screw other end
In hollow piston rod, feed screw nut is arranged on the piston of piston rod, and ball-screw can only rotate, the piston
In the presence of bar frictional force and outer load internally, translation can only be done, can not be rotated.
The present invention adds housing configuration on the outside of Numeric hydraulic cylinder valve element, passes through the servo-actuated position for realizing hydraulic cylinder of valve pocket
Dynamical feedback is put, so as to be disconnected the mechanical attachment of valve element and ball-screw, improves the controllability of valve element.The valve element of the present invention
Driven and controlled by servomotor, valve pocket is driven by ball-screw and controlled, by feedback valve pocket and the relative motion of both valve elements
Control, realize the closed-loop digital control to Numeric hydraulic cylinder displacement.
Compared with conventional digital hydraulic cylinder, the present invention has following technical advantage：
(1) control system is simple
The feedback control of Numeric hydraulic cylinder is realized using high-precision ball-screw, and utilizes the relative position of valve element and valve pocket
Put the aperture size for carrying out control valve, it is not necessary to complicated control system, therefore the control system is relative to ordinary numbers hydraulic cylinder
It is simpler.
(2) reliability is high
Fed back in high precision using fully mechanical in digital hydraulic cylinder interior, substantially increase the internal drive of Numeric hydraulic cylinder
Reliability, make hydraulic cylinder works safe and reliable.
Brief description of the drawings
Fig. 1 is the structural representation for the machine feedback formula Numeric hydraulic cylinder that valve pocket can be servo-actuated.
Fig. 2 is Fig. 1 partial enlarged drawing.
Embodiment
Below in conjunction with the accompanying drawings and embodiment the present invention will be further described：
As shown in Fig. 1~2, machine feedback formula Numeric hydraulic cylinder is by servomotor 1, shaft coupling 2, screw rod 3, valve element 4, sealing
Circle 5, valve protecgulum 6, valve pocket 7, valve body 8, cylinder bonnet 9, sealing ring 10, bearing 11, ball-screw 12, feed screw nut 13, piston rod
14 and cylinder body 15 form.Servomotor 1 is used for return pulse signal and communicates rotational motion to screw rod 3, spiral shell by shaft coupling 2
The internal thread that bar 3 closes on the one end of servomotor 1 with valve element is engaged, and valve element 4 is nested in valve pocket 7 and can slid axially, valve pocket 7
It is nested in valve body 8 and can slides axially, the valve pocket 7 is outer provided with internal thread and with the one end of ball-screw 12 close to cylinder body one end
Screw thread is engaged, and feed screw nut 13 is fixed on the one end of piston rod 14, and ball-screw 12 is nested in hollow piston rod 14, can only
Rotate.In the presence of frictional force and the outer load internally of piston rod 14, translation can only be done, not rotatably.The both ends of valve body 8
Cylinder bonnet 9 and valve protecgulum 6 are fixedly connected with, cylinder bonnet 9 is connected with cylinder body 15, the cage connection of valve protecgulum 6 and servomotor 1.Cylinder
The rodless cavity end of body 15 is provided with bearing, and bearing realizes axial restraint by cylinder body 15 and cylinder bonnet 9, only rotatable, for propping up
Support ball-screw.Valve body 8 is provided with axial cylindrical hole, for being embedded in valve pocket 7, the lateral wall of valve element 4 be provided with four boss c,
D, e, f, the madial wall of valve pocket 7 are provided with the groove corresponding with four boss of valve element, and valve element 4 and valve pocket 7, which coordinate, forms three
Four-way hydraulic valve, the side wall of valve body 15 are radially provided with oil circuit through hole A, B, T, the P corresponding with three-position four-way hydraulic valve, body wall
Oil circuit via openings opening position be provided with the oil circuit open slot that axially expands, between each oil circuit open slot and oil circuit open slot
Do not connected mutually between valve body end face.The aperture of oil circuit open slot is 3 times of oil circuit through-hole diameter.
As shown in Fig. 2 valve element 4 and valve pocket 7 coordinate in the three-position four-way hydraulic valve formed, valve pocket 7 and valve body 8 axially according to
Secondary arrangement corresponds to T, A, P, the oilhole and oil circuit of B interface, A, boss d, e and valve pocket 7 of B interface oilhole corresponding to the difference of valve element 4
Inwall between surround the cavity connected with P mouths, the inwall between boss c and boss d, between boss e and boss f with valve pocket 7
Surround the cavity with T orifices.
The specific work process of the Numeric hydraulic cylinder of the present invention is as follows：First one is sent by Numeric hydraulic cylinder control system
Pulse signal, start to rotate after the return pulse signal of servomotor 1, because servomotor 1 is connected by shaft coupling 2 with screw rod 3,
And valve element 4 closes on the one end of servomotor 1 the internal thread mutual cooperation having with the cooperation of screw rod 3, valve element 4 can only move axially,
So screw rod 3 moves axially with movable valve plug 4 under turning effort.If valve element 4 is moved to the left, P mouths connect with A mouths, B mouths
Connected with T mouths.Hydraulic oil at P mouths, hydraulic cylinder rodless cavity, rodless cavity supercharging are flowed into by A mouths, piston rod 14 is transported to the left
Dynamic, the oil of hydraulic cylinder rod chamber flows back to fuel tank by B mouths, T mouths.
During the translation to the left of piston rod 14, drive and be fixed on feed screw nut 13 on piston rod 14 to left movement, ball screw
12 do not move in the axial direction, and ball screw 12 occurs with servomotor 1 to despining, because ball-screw 12 is on hydraulic valve
External screw thread be engaged with the screw thread of valve pocket 7, valve pocket 7 can move axially, therefore the valve pocket 7 of ball-screw 12 is given birth under turning effort
Move axially and move right, valve port is closed, and a stepping process terminates.
Claims (5)
- A kind of 1. machine feedback formula Numeric hydraulic cylinder that valve pocket can be servo-actuated, it is characterised in that including servomotor, screw rod, valve element, Valve pocket, valve body, ball-screw, feed screw nut, piston rod, cylinder body, the main shaft of servomotor are connected by shaft coupling and screw rod one end Connect, the screw rod other end is engaged with the internal thread of valve element, and for valve element in valve pocket, screw rod can be axially sliding along valve pocket with movable valve plug Dynamic, valve pocket is in valve body, and the lateral wall of valve element is provided with multiple convex edges, and the madial wall of valve pocket is provided with relative with the convex edge of valve element The groove answered, valve element and valve pocket, which coordinate, forms three-position four-way hydraulic valve, and body wall is radially provided with and three-position four-way hydraulic valve phase Corresponding oil circuit through hole, valve pocket are engaged close to cylinder body end provided with internal thread with the external screw thread of ball-screw one end, and valve pocket exists Ball-screw can be slid axially under driving along valve body, and the ball-screw other end is flush-mounted in hollow piston rod, and feed screw nut is set To put on the piston of piston rod, ball-screw can only rotate, in the presence of piston rod frictional force and outer load internally, Translation can only be done, can not be rotated.
- 2. the machine feedback formula Numeric hydraulic cylinder that a kind of valve pocket according to claim 1 can be servo-actuated, it is characterised in that described Valve body both ends are fixedly connected with cylinder bonnet and valve protecgulum, and the cylinder bonnet is connected with cylinder body, outside the valve protecgulum and servomotor Shell connects.
- 3. the machine feedback formula Numeric hydraulic cylinder that a kind of valve pocket according to claim 2 can be servo-actuated, it is characterised in that described The rodless cavity end of cylinder body is provided with bearing, and bearing realizes axial restraint by cylinder body and cylinder bonnet, only rotatable, for back-up roller Ballscrew.
- 4. the machine feedback formula Numeric hydraulic cylinder that a kind of valve pocket according to claim 1 can be servo-actuated, it is characterised in that described The oil circuit via openings opening position of body wall is provided with the oil circuit open slot that axially expands, between each oil circuit open slot and oil Do not connected mutually between road open slot and valve body end face.
- 5. the machine feedback formula Numeric hydraulic cylinder that a kind of valve pocket according to claim 4 can be servo-actuated, it is characterised in that described The aperture of oil circuit open slot is 3 times of oil circuit through-hole diameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710771383.6A CN107387810A (en) | 2017-08-31 | 2017-08-31 | The machine feedback formula Numeric hydraulic cylinder that a kind of valve pocket can be servo-actuated |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710771383.6A CN107387810A (en) | 2017-08-31 | 2017-08-31 | The machine feedback formula Numeric hydraulic cylinder that a kind of valve pocket can be servo-actuated |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107387810A true CN107387810A (en) | 2017-11-24 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710771383.6A Pending CN107387810A (en) | 2017-08-31 | 2017-08-31 | The machine feedback formula Numeric hydraulic cylinder that a kind of valve pocket can be servo-actuated |
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| Country | Link |
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| CN (1) | CN107387810A (en) |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108533561A (en) * | 2018-04-13 | 2018-09-14 | 东北大学 | Internal indirect feedback formula digital hydraulic cylinder structure is driven in a kind of |
| CN108973969A (en) * | 2018-07-26 | 2018-12-11 | 宁波日安精工机械有限公司 | A kind of high leakproofness hydraulic vehicle braking valve |
| CN109975125A (en) * | 2019-03-11 | 2019-07-05 | 山东科技大学 | The pressure water experimental facilities and method detected based on coal body or rock-mass relaxing circle |
| CN110594475A (en) * | 2018-06-12 | 2019-12-20 | 北京华德液压工业集团有限责任公司 | Motor-driven digital valve |
| WO2020082271A1 (en) * | 2018-10-24 | 2020-04-30 | 武汉海力威机电科技有限公司 | Location tracking type pilot-operated proportional hydraulic valve |
| CN111765269A (en) * | 2019-04-01 | 2020-10-13 | 浙江盾安禾田金属有限公司 | Switching valve and refrigerating system with same |
| CN112360838A (en) * | 2020-10-28 | 2021-02-12 | 辽宁工程技术大学 | High-frequency-response, high-precision and low-friction digital fluid cylinder |
| CN112664500A (en) * | 2020-12-23 | 2021-04-16 | 苏州宏腾液压机电科技有限公司 | Rotary valve assembly for digital hydraulic oil cylinder and corresponding mechanical feedback digital hydraulic oil cylinder |
| CN113944776A (en) * | 2021-09-23 | 2022-01-18 | 中材(北京)地热能科技有限公司 | Special double-U-shaped double-temperature conversion control combined valve body |
| CN114060347A (en) * | 2020-08-07 | 2022-02-18 | 徐州重型机械有限公司 | Digital hydraulic cylinder with mechanical braking function |
| CN114060330A (en) * | 2021-11-15 | 2022-02-18 | 中铁工程装备集团有限公司 | Hydraulic propelling device and hydraulic propelling system of shield tunneling machine |
| CN114382744A (en) * | 2022-02-25 | 2022-04-22 | 邵阳先进制造技术研究院有限公司 | Digital hydraulic cylinder applied to textile splitting machine |
| CN115179516A (en) * | 2022-06-16 | 2022-10-14 | 西诺控股集团有限公司 | Integrated digital hydraulic cylinder precision control mold opening and closing device of injection molding machine |
| CN115366368A (en) * | 2022-06-15 | 2022-11-22 | 西诺控股集团有限公司 | Ejection and storage system of integrated injection molding machine |
| CN115507086A (en) * | 2022-10-28 | 2022-12-23 | 北京天玛智控科技股份有限公司 | Hydraulic device and digital hydraulic cylinder with mechanical position pilot feedback |
-
2017
- 2017-08-31 CN CN201710771383.6A patent/CN107387810A/en active Pending
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108533561A (en) * | 2018-04-13 | 2018-09-14 | 东北大学 | Internal indirect feedback formula digital hydraulic cylinder structure is driven in a kind of |
| CN110594475A (en) * | 2018-06-12 | 2019-12-20 | 北京华德液压工业集团有限责任公司 | Motor-driven digital valve |
| CN108973969A (en) * | 2018-07-26 | 2018-12-11 | 宁波日安精工机械有限公司 | A kind of high leakproofness hydraulic vehicle braking valve |
| CN108973969B (en) * | 2018-07-26 | 2020-05-19 | 宁波日安精工机械有限公司 | High leakproofness car hydraulic brake valve |
| WO2020082271A1 (en) * | 2018-10-24 | 2020-04-30 | 武汉海力威机电科技有限公司 | Location tracking type pilot-operated proportional hydraulic valve |
| CN109975125A (en) * | 2019-03-11 | 2019-07-05 | 山东科技大学 | The pressure water experimental facilities and method detected based on coal body or rock-mass relaxing circle |
| CN111765269A (en) * | 2019-04-01 | 2020-10-13 | 浙江盾安禾田金属有限公司 | Switching valve and refrigerating system with same |
| CN114060347A (en) * | 2020-08-07 | 2022-02-18 | 徐州重型机械有限公司 | Digital hydraulic cylinder with mechanical braking function |
| CN114060347B (en) * | 2020-08-07 | 2024-03-19 | 徐州重型机械有限公司 | Digital hydraulic cylinder with mechanical braking function |
| CN112360838A (en) * | 2020-10-28 | 2021-02-12 | 辽宁工程技术大学 | High-frequency-response, high-precision and low-friction digital fluid cylinder |
| CN112664500A (en) * | 2020-12-23 | 2021-04-16 | 苏州宏腾液压机电科技有限公司 | Rotary valve assembly for digital hydraulic oil cylinder and corresponding mechanical feedback digital hydraulic oil cylinder |
| CN113944776A (en) * | 2021-09-23 | 2022-01-18 | 中材(北京)地热能科技有限公司 | Special double-U-shaped double-temperature conversion control combined valve body |
| CN114060330A (en) * | 2021-11-15 | 2022-02-18 | 中铁工程装备集团有限公司 | Hydraulic propelling device and hydraulic propelling system of shield tunneling machine |
| CN114060330B (en) * | 2021-11-15 | 2024-04-30 | 中铁工程装备集团有限公司 | Hydraulic propulsion device and hydraulic propulsion system of shield tunneling machine |
| CN114382744A (en) * | 2022-02-25 | 2022-04-22 | 邵阳先进制造技术研究院有限公司 | Digital hydraulic cylinder applied to textile splitting machine |
| CN115366368A (en) * | 2022-06-15 | 2022-11-22 | 西诺控股集团有限公司 | Ejection and storage system of integrated injection molding machine |
| CN115179516A (en) * | 2022-06-16 | 2022-10-14 | 西诺控股集团有限公司 | Integrated digital hydraulic cylinder precision control mold opening and closing device of injection molding machine |
| CN115507086A (en) * | 2022-10-28 | 2022-12-23 | 北京天玛智控科技股份有限公司 | Hydraulic device and digital hydraulic cylinder with mechanical position pilot feedback |
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Application publication date: 20171124 |