CN106870516B - A kind of HTHP rheometer fluid pressure type axis pressure generating apparatus and its application method - Google Patents
A kind of HTHP rheometer fluid pressure type axis pressure generating apparatus and its application method Download PDFInfo
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- CN106870516B CN106870516B CN201710193214.9A CN201710193214A CN106870516B CN 106870516 B CN106870516 B CN 106870516B CN 201710193214 A CN201710193214 A CN 201710193214A CN 106870516 B CN106870516 B CN 106870516B
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- plunger case
- oil
- hydraulic valve
- cylinder
- generating apparatus
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/08—Servomotor systems incorporating electrically operated control means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/021—Valves for interconnecting the fluid chambers of an actuator
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/024—Pressure relief valves
-
- 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
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
-
- 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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering
Abstract
The invention discloses a kind of HTHP rheometer fluid pressure type axis pressure generating apparatus and its application method, it includes fuel tank, oil pump, plunger case, pressurizing cylinder, controller, the input channel of the oil pump is connected with fuel tank, output channel is connected separately with three oil circuits, first oil circuit is connected by drain line with fuel tank, Article 2 oil circuit is connected with the oil inlet of plunger case, Article 3 oil circuit is connected with the rodless cavity of pressurized cylinder, detecting element is configured at the both ends of pressurizing cylinder, the tailpiece of the piston rod of the pressurized cylinder and the compression bar phase configuration of HTHP rheometer, the tailpiece of the piston rod of the plunger case is driven by plunger case driving device, the cylinder diameter of the pressurized cylinder is bigger than the cylinder diameter of plunger case, the two is poor there are ratio, the controller is connected respectively with detecting element and plunger case driving device.The present invention realizes that Quick-pressing, low speed feeding, accurate pressurize, ftercompction and the return of axis pressure work by the various combination of finite element, and whole process operates steadily, and noise is small.
Description
Technical field
The present invention relates to a kind of high-pressure experimental study field more particularly to HTHP rheometer fluid pressure type axis pressures
Generating means and its application method both can be applied to laboratory ultra high pressure experimental study, it can also be used to geoscience research,
The ultra high pressure equipment of each technical fields such as aerospace, shipping industry, material molding, petrochemical industry.
Background technology
The development of hydraulic technique and TT＆C system causes ultrahigh-pressure hydraulic research application to obtain made rapid progress.High temperature and high pressure flow
It is advanced laboratory apparatus during Earth is probed into become instrument, the reliability of result of study be heavily dependent on confining pressure pressure,
Axial strain and the control accuracy of heating system.Rheometer is by the movement speed and extruding force size of control deformation plunger come mould
Intend axial hyperbaric environment, carry out rheology research.When carrying out deformation experiment, the rate of rheology is 10-2~10-7/ s, it is desirable that
Axial strain movement velocity is low and range is wide, while precision will height.In common high temperature and pressure rheology equipment, confining pressure system
Hydraulic drive is had evolved into, axis pressure transmission is still mostly based on the traditional form of " motor+retarder+ball-screw ".While by
It is indefinite in motor low-speed performance, often ensured in machine driving using multistage high reduction ratio retarder series connection to small feeding
Control.And find in practical applications, the noise that this multi-stage mechanical transmission generates can be to sound wave, vibration detection in rheological experiment
A degree of interference is generated, therefore it is significant to carry out fluid pressure type transformation to rheometer axis pressure system based on superhigh pressure technique
's.
In rheometer axis hydraulic fluid pressure type transformation process is realized, it is that key is asked that how accurate control shaft, which forces down rate feeding,
Topic, how this controls small inlet flow rate if being just related to, especially in ultra high pressure stage.High-speed switch response valve speed in the market
Degree is slower, and the switching frequency not reached requirement can not meet experiment demand.
Invention content
The technical problems to be solved by the invention are to provide a kind of can be achieved in view of the deficiency of the prior art
Low pressure Quick-pressing, the feeding of super-pressure low rate HTHP rheometer with fluid pressure type axis pressure generating apparatus and its user
Method.
The technical solution adopted in the present invention is：A kind of HTHP rheometer fluid pressure type axis pressure generating apparatus, packet
Fuel tank, oil pump, plunger case, pressurizing cylinder, controller are included, the input channel of the oil pump is connected with fuel tank, output channel difference
Three oil circuits are connected with, first oil circuit is connected by drain line with fuel tank, the oil inlet phase of Article 2 oil circuit and plunger case
Even, Article 3 oil circuit is connected with the rodless cavity of pressurized cylinder, and detecting element is configured at the both ends of pressurizing cylinder, the pressurized cylinder
The compression bar phase configuration of tailpiece of the piston rod and HTHP rheometer, the tailpiece of the piston rod of the plunger case are driven by plunger case driving device
Dynamic, the cylinder diameter of the pressurized cylinder is smaller than the cylinder diameter of plunger case, and the two is poor there are ratio, the controller respectively with detecting element and
Plunger case driving device is connected.
By above-mentioned technical proposal, the first hydraulic valve is installed on the output pipe of oil pump, in the entrance of Article 2 oil circuit
Equipped with the second hydraulic valve, third hydraulic valve is equipped in the entrance of Article 3 oil circuit.
By above-mentioned technical proposal, the drain line includes automatically controlled servo valve and manual overflow valve, after the two is parallel with one another
It is connected with fuel tank.
By above-mentioned technical proposal, the plunger case driving device includes the second servo motor, the output of the second servo motor
Axis is connected by transmission mechanism with the tailpiece of the piston rod of plunger case, and the piston rod for driving plunger case does linear reciprocating motion.
By above-mentioned technical proposal, the oil pump is worked by the first servo motor driven oil pump.
By above-mentioned technical proposal, the plunger case is single-piston formula hydraulic cylinder, and one is respectively equipped at the both ends of plunger case
Limit switch, when its plunger rod contacts is to one of limit switch, the second servo motor can be automatically stopped work.
By above-mentioned technical proposal, the detecting element includes displacement sensor and pressure sensor.
By above-mentioned technical proposal, first hydraulic valve, the second hydraulic valve and third hydraulic valve are hand-operated hydraulic valve.
By above-mentioned technical proposal, the cylinder diameter ratio of the plunger case and pressurized cylinder is：1:8~1:12.
A kind of application method of HTHP rheometer fluid pressure type axis pressure generating apparatus, it is characterised in that：Including as follows
Step：
S1, HTHP rheometer fluid pressure type axis pressure generating apparatus as described above is provided；
S2, axial initial stage pressurization steps are carried out, specially：First, second, third hydraulic valve is opened, starts the first servo
Hydraulic oil is reached the first hydraulic valve by motor driving oil pump, and the hydraulic oil with pressure is passing through Article 2 oil circuit and third respectively
Pressurizing cylinder and plunger case are had respectively entered after oil circuit；
S3, rheological experiment step is carried out, specially：During axial low speed feeding, the first liquid on oil pump output pipe is closed
Pressure valve, and the third hydraulic valve on the second hydraulic valve and Article 3 oil circuit on Article 2 oil circuit is opened, start the second servo electricity
Machine, the piston of plunger case constantly advances to rodless cavity under the drive of the second servo motor, and fluid enters after Article 3 oil circuit
Pressurizing cylinder, while the numerical value of Real-time Feedback pressure sensor and position sensor carry out closed-loop control to the second servo motor
System, slowly pressurize automatic pressure-maintaining until reaching target；
S4, ftercompction step is carried out, specially：Automatically controlled servo valve and manual overflow valve are adjusted, is closed on Article 3 oil circuit
Third hydraulic valve opens first, second hydraulic valve, starts oil pump and the second servo motor and carries out ftercompction work to plunger case, mends
Plunger case can continue to carry out pressurize and feeding task to pressurizing cylinder after the completion of pressure；
S5, progress return low speed move back pressure step, close the first hydraulic valve, open second, third hydraulic valve, start second and watch
It takes motor to be inverted at a slow speed, piston rod is driven to retreat realization and moves back pressure work, so as to which pressurizing cylinder piston be driven to retreat, realizes pressure
The separation of bar and sample；
S6, when move back be pressed onto in the range of safe pressure when, close the second hydraulic valve, it is quick by the way that automatically controlled servo valve is controlled to realize
Move back pressure.
The present invention operation principle be：The present invention passes through transmission mechanism and piston rod by the way that plunger case hydraulic cylinder is anticaustic
Connection the rotary motion of the second servo motor is converted into linear motion, promote the feeding of plunger case liquid so as to fulfill to supercharging
The supply of cylinder fluid；The design of plunger case cylinder diameter is much larger than by pressurizing cylinder cylinder diameter simultaneously, can solve to feed in transmission small
And the second servo motor rotating speed cannot be too small contradiction, rationally design two hydraulic cylinders cylinder diameter ratio can effectively reach super
The accurate control of the small feeding of oil cylinder piston is realized while high axis pressure request by transformational relation.
Having the beneficial effect that acquired by the present invention：
1st, the Quick-pressing for the various combination realization axis pressure that the present invention passes through finite element, low speed feeding, accurate pressurize, benefit
Pressure and return work, whole process operate steadily, and noise is small.
2nd, the present apparatus is realized using the low-pressure side of servo motor, servo valve, plunger case control pressurizing cylinder to super-pressure pressure
The control of power, system are common Hydraulic Elements, are easily purchased, the manufacturing cycle is short, at low cost.
3rd, the present apparatus use the fluid pressure type kind of drive, can effectively realize the accurate control of large and small flow, have pressurize into
Give, holding pressure control, ftercompction, return function, can reach axial rheological experiment requirement, solve to interfere present in machine driving and ask
Topic operates steadily reliable, which can be used as test research device, can be used for needing the metallurgy of super-pressure, material molding etc.
Other occasions.
Description of the drawings
Fig. 1 is the schematic diagram of HTHP rheometer fluid pressure type axis pressure generating apparatus provided by the invention.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.
As shown in Figure 1, a kind of HTHP rheometer fluid pressure type axis pressure generating apparatus is present embodiments provided, including
Fuel tank 1, filter 2, oil pump 3, check valve 5, plunger case 13, pressurizing cylinder 11, controller.The oil pump 3 passes through the first servo
Motor 4 drives operation of oil pump, and the input channel of the oil pump 3 is connected by filter 2 with fuel tank 1, and output channel connects respectively
There are three oil circuits, first oil circuit is connected by drain line with fuel tank, and Article 2 oil circuit is connected with the oil inlet of plunger case 13,
Article 3 oil circuit is connected with the rodless cavity of pressurized cylinder 11, and detecting element 10, the supercharging are configured at the both ends of pressurizing cylinder 11
The tailpiece of the piston rod of cylinder 11 and the compression bar phase configuration of HTHP rheometer, the tailpiece of the piston rod of the plunger case 13 are driven by plunger case
Dynamic device driving, the cylinder diameter of the plunger case is smaller than the cylinder diameter of pressurized cylinder, and there are ratios preferably 1 for the two:10, the controller point
It is not connected with detecting element 10 and plunger case driving device, wherein, the detecting element 10 includes displacement sensor and pressure passes
Sensor.
In the present embodiment, the first hydraulic valve 6 is installed on the output pipe of oil pump 3, is set in the entrance of Article 2 oil circuit
There is the second hydraulic valve 12, third hydraulic valve 9 is equipped in the entrance of Article 3 oil circuit, in the present embodiment, first hydraulic valve 6,
Second hydraulic valve 12 and third hydraulic valve 9 are ultra-high-pressure hand hydraulic valve.Pressurizing cylinder 11 is extra high pressure charging oil cylinder (existing
There is under equipment high pressure end pressure up to 120MPa).
In the present embodiment, the drain line include automatically controlled servo valve 8 and manual overflow valve 7, the two it is parallel with one another after with
Fuel tank 1 is connected.
In the present embodiment, the plunger case driving device includes the second servo motor 14, the output shaft of the second servo motor
It is connected by retarder and transmission mechanism with the tailpiece of the piston rod of plunger case, the piston rod for driving plunger case does reciprocating linear fortune
It is dynamic., the plunger case 13 is single-piston formula hydraulic cylinder, a limit switch is respectively equipped at the both ends of plunger case, when its piston
When bar touches one of limit switch, the second servo motor can be automatically stopped work.
The present apparatus is realized using the low-pressure side of servo motor, servo valve, plunger case control pressurizing cylinder to ultra high pressure
Control, system is common Hydraulic Elements, easily purchase, the manufacturing cycle is short, at low cost.
The present invention also provides a kind of HTHP rheometer application method of fluid pressure type axis pressure generating apparatus, including such as
Lower step：
S1, HTHP rheometer fluid pressure type axis pressure generating apparatus as described above is provided；
S2, axial initial stage pressurization steps are carried out, specially：First, second, third hydraulic valve (6,12,9) is opened, is started
First servo motor 4 drives oil pump 3 that hydraulic oil is reached the first hydraulic valve 6, and the hydraulic oil with pressure is passing through second respectively
The rodless cavity end of pressurizing cylinder 11 and plunger case 13 is had respectively entered after oil circuit and Article 3 oil circuit, is on the one hand realized to supercharging
On the other hand the big flow supply of oil cylinder can be achieved to supplement the fluid of plunger case；
S3, rheological experiment step is carried out, specially：During axial low speed feeding, the first liquid on 3 output pipe of oil pump is closed
Pressure valve 6, and the third hydraulic valve 9 on the second hydraulic valve 12 and Article 3 oil circuit on Article 2 oil circuit is opened, start second and watch
Motor 14 is taken, the piston of plunger case 13 constantly advances to rodless cavity under the drive of the second servo motor 14, and fluid is through Article 3
Enter pressurizing cylinder 11, while the numerical value of Real-time Feedback pressure sensor and position sensor after oil circuit, to the second servo motor
14 carry out full closed loop control, slowly pressurization automatic pressure-maintaining until reaching target；
S4, ftercompction step is carried out, specially：Automatically controlled servo valve 8 and manual overflow valve 7 are adjusted, is closed on Article 3 oil circuit
Third hydraulic valve 9, open first, second hydraulic valve (6,12), start 3 and second servo motor 14 of oil pump to plunger case 13 into
Row ftercompction works, and plunger case 13 can continue to carry out pressurize and feeding task to pressurizing cylinder 11 after the completion of ftercompction；
S5, progress return low speed move back pressure step, close the first hydraulic valve 6, open second, third hydraulic valve (12,9), open
Dynamic second servo motor 14 is inverted at a slow speed, and piston rod is driven to retreat realization and moves back pressure work, so as to which pressurizing cylinder 11 be driven to live
Plug retreats, and realizes the separation of compression bar and sample；To ensure that return is smoothed out, before moving back pressure task and carrying out, third can be first closed
Hydraulic valve, opens manual overflow valve and the second servo motor 14 empties hydraulic oil in plunger case 13, is moved back with having sufficient space
Pressure；
S6, when move back be pressed onto in the range of safe pressure when, close the second hydraulic valve 12, by the way that automatically controlled servo valve 8 is controlled to realize
Quickly move back pressure.
Claims (9)
1. a kind of HTHP rheometer application method of fluid pressure type axis pressure generating apparatus, it is characterised in that：Including walking as follows
Suddenly：
S1, a kind of HTHP rheometer fluid pressure type axis pressure generating apparatus is provided, including fuel tank, oil pump, plunger case, supercharging
Oil cylinder, controller, the input channel of the oil pump are connected with fuel tank, and output channel is connected separately with three oil circuits, first oil
Road is connected by drain line with fuel tank, and Article 2 oil circuit is connected with the oil inlet of plunger case, Article 3 oil circuit and pressurizing cylinder
Rodless cavity be connected, detecting element, the tailpiece of the piston rod and high temperature and pressure of the pressurizing cylinder are configured at the both ends of pressurizing cylinder
The compression bar phase configuration of rheometer, the tailpiece of the piston rod of the plunger case are driven by plunger case driving device, the pressurizing cylinder
Cylinder diameter is bigger than the cylinder diameter of plunger case, and the two is poor there are ratio, the controller respectively with detecting element and plunger case driving device
It is connected；
S2, axial initial stage pressurization steps are carried out, specially：First, second, third hydraulic valve is opened, starts the first servo motor
Hydraulic oil is reached the first hydraulic valve by driving oil pump, and the hydraulic oil with pressure is passing through Article 2 oil circuit and Article 3 oil respectively
Pressurizing cylinder and plunger case are had respectively entered behind road；
S3, rheological experiment step is carried out, specially：During axial low speed feeding, the first hydraulic valve on oil pump output pipe is closed,
And the third hydraulic valve on the second hydraulic valve and Article 3 oil circuit on Article 2 oil circuit is opened, start the second servo motor,
The piston of plunger case constantly advances to rodless cavity under the drive of second servo motor, and fluid enters pressurised oil after Article 3 oil circuit
Cylinder, while the numerical value of Real-time Feedback pressure sensor and position sensor carry out full closed loop control, slowly to the second servo motor
Pressurization automatic pressure-maintaining until reaching target；
S4, ftercompction step is carried out, specially：Automatically controlled servo valve and manual overflow valve are adjusted, closes the third on Article 3 oil circuit
Hydraulic valve opens first, second hydraulic valve, starts oil pump and the second servo motor and carries out ftercompction work to plunger case, ftercompction is complete
It can continue to carry out pressurize and feeding task to pressurizing cylinder into rear pillar plug cylinder；
S5, progress return low speed move back pressure step, close the first hydraulic valve, open second, third hydraulic valve, start the second servo electricity
Machine is inverted at a slow speed, drive piston rod retreat realize moves back pressure work, so as to drive pressurizing cylinder piston retreat, realize compression bar with
The separation of sample；
S6, when move back be pressed onto in the range of safe pressure when, the second servo motor is closed, by the way that the realization of automatically controlled servo valve is controlled to move back pressure.
2. the HTHP rheometer according to claim 1 application method of fluid pressure type axis pressure generating apparatus, feature
It is：The first hydraulic valve is installed on the output pipe of oil pump, the second hydraulic valve is equipped in the entrance of Article 2 oil circuit, the
The entrance of three oil circuits is equipped with third hydraulic valve.
3. the HTHP rheometer according to claim 1 or 2 application method of fluid pressure type axis pressure generating apparatus, special
Sign is：The drain line includes automatically controlled servo valve and manual overflow valve, is connected after the two is parallel with one another with fuel tank.
4. the HTHP rheometer according to claim 1 or 2 application method of fluid pressure type axis pressure generating apparatus, special
Sign is：The plunger case driving device includes the second servo motor, the output shaft of the second servo motor by transmission mechanism with
The tailpiece of the piston rod of plunger case is connected, and the piston rod for driving plunger case does linear reciprocating motion.
5. the HTHP rheometer according to claim 1 or 2 application method of fluid pressure type axis pressure generating apparatus, special
Sign is：The oil pump is worked by the first servo motor driven oil pump.
6. the HTHP rheometer according to claim 4 application method of fluid pressure type axis pressure generating apparatus, feature
It is：The plunger case is single-piston formula hydraulic cylinder, a limit switch is respectively equipped at the both ends of plunger case, when its piston rod
When touching one of limit switch, the second servo motor can be automatically stopped work.
7. the HTHP rheometer according to claim 1 or 2 application method of fluid pressure type axis pressure generating apparatus, special
Sign is：The detecting element includes displacement sensor and pressure sensor.
8. the HTHP rheometer according to claim 2 application method of fluid pressure type axis pressure generating apparatus, feature
It is：First hydraulic valve, the second hydraulic valve and third hydraulic valve are hand-operated hydraulic valve.
9. the HTHP rheometer according to claim 1 or 2 application method of fluid pressure type axis pressure generating apparatus, special
Sign is：The cylinder diameter of the plunger case and pressurizing cylinder ratio is：1:8~1:12.
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| CN201710193214.9A CN106870516B (en) | 2017-03-28 | 2017-03-28 | A kind of HTHP rheometer fluid pressure type axis pressure generating apparatus and its application method |
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| CN201710193214.9A CN106870516B (en) | 2017-03-28 | 2017-03-28 | A kind of HTHP rheometer fluid pressure type axis pressure generating apparatus and its application method |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201803925U (en) * | 2010-08-18 | 2011-04-20 | 中国东方电气集团有限公司 | High-temperature high-pressure rheometer |
| CN204705065U (en) * | 2015-06-10 | 2015-10-14 | 中国地质大学（武汉） | A kind of HTHP rheometer detachable cold radiator cooler |
| CN105508319A (en) * | 2016-01-19 | 2016-04-20 | 中国地质大学（武汉） | Ultrahigh-pressure hydraulic pressurization system controlled by low-pressure servo source |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3340085B2 (en) * | 1999-04-13 | 2002-10-28 | 日本たばこ産業株式会社 | Material testing machine |
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2017
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201803925U (en) * | 2010-08-18 | 2011-04-20 | 中国东方电气集团有限公司 | High-temperature high-pressure rheometer |
| CN204705065U (en) * | 2015-06-10 | 2015-10-14 | 中国地质大学（武汉） | A kind of HTHP rheometer detachable cold radiator cooler |
| CN105508319A (en) * | 2016-01-19 | 2016-04-20 | 中国地质大学（武汉） | Ultrahigh-pressure hydraulic pressurization system controlled by low-pressure servo source |
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