CN107420361A - A kind of pre-rotation hydraulic circuit - Google Patents
A kind of pre-rotation hydraulic circuit Download PDFInfo
- Publication number
- CN107420361A CN107420361A CN201710754372.7A CN201710754372A CN107420361A CN 107420361 A CN107420361 A CN 107420361A CN 201710754372 A CN201710754372 A CN 201710754372A CN 107420361 A CN107420361 A CN 107420361A
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- Prior art keywords
- rotation
- path block
- oil path
- valve
- hydraulic circuit
- 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.)
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Links
- 238000009987 spinning Methods 0.000 claims description 17
- 239000002828 fuel tank Substances 0.000 claims description 12
- 230000008878 coupling Effects 0.000 claims description 7
- 238000010168 coupling process Methods 0.000 claims description 7
- 238000005859 coupling reaction Methods 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 230000003245 working effect Effects 0.000 claims description 2
- 238000009434 installation Methods 0.000 claims 1
- 239000003921 oil Substances 0.000 abstract description 99
- 239000010705 motor oil Substances 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 abstract 1
- 239000013589 supplement Substances 0.000 abstract 1
- 239000012530 fluid Substances 0.000 description 7
- 239000010720 hydraulic oil Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 230000001052 transient effect Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000006837 decompression Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Frying-Pans Or Fryers (AREA)
Abstract
The present invention proposes a kind of pre-rotation hydraulic circuit, belongs to hydraulic means.Including：Power plant module, control module, execution module, supplementary module.The hydraulic circuit that the present invention is announced can control the function that active rotation, passive rotation and the active rotation conversion of executive component passively rotate, and executive component output speed and torque range are adjustable.It is excessively steady that active rotation is converted to passive rotation, and multichannel executive component can be achieved and work simultaneously.The executive component hydraulic motor（23）Speed is adjusted by the flow speed control valve（21）Regulation, executive component Stress control is by the pressure-reducing valve（14）Regulation.Advantage is to set check valve in the control module hydraulic circuit（18）, when the two-position two-way electromagnetic directional valve（17）During commutation, the executive component is converted to passive rotation by active rotation, can pass through the check valve（18）Oil suction supplements the executive component hydraulic motor oil suction, prevents emptying phenomenon.Solves the problems such as pre-rotation loop works are unstable, and reliability is low, failure.
Description
Technical field
The present invention relates to Hydraulic Field, specifically, being related to a kind of pre-rotation hydraulic circuit.
Background technology
Such as three spinning-roller spinning machine pre-rotation apparatus, the device is used in rotary pressing processing, before spinning roller contacts with workpiece,
Give spinning roller one pre-rotation action, make spinning roller linear velocity equal with the linear velocity of workpiece surface.After spinning roller contacts with workpiece,
Close spinning roller to prewhirl rotating function, make spinning roller in the presence of rotational workpieces frictional force, it is passive as workpiece rotates.Pre-rotation work(
Friction when spinning roller contacts with workpiece can be effectively reduced, improves the surface quality of spinning product.
In spinning machine spinning roller pre-rotation apparatus, product generally uses two methods both at home and abroad at present：Fluid pressure drive device
And motor driver.Wherein fluid pressure drive device has the advantages of its is peculiar, including power-weight ratio is big, driving element hydraulic pressure
Installing space needed for motor is small, and output speed, moment of torsion are big, and pressure is easy to adjust, therefore hydraulic-driven pre-rotation apparatus is wide
General use.
For the working condition requirement of pre-rotation, the selection of design and control valve to pre-rotation loop directly influences the device
The quality of performance and the height of reliability.If spinning machine pre-rotation loop is when active rotation is converted to passive rotation, if main
Dynamic rotation and passive rotary rpm difference are larger, the situation that pre-rotation motor twists off with spinning roller connecting shaft occur.The present invention exists
On the basis of summary forefathers' failure experience, it is proposed that a kind of pre-rotation hydraulic circuit, effectively improve in the solenoid directional control valve
（17）Emptying phenomenon caused by during commutation, reduces probability of malfunction, improves the reliability in pre-rotation loop.
The content of the invention
The purpose of the present invention is to propose to a kind of pre-rotation hydraulic circuit, solves lathe pre-rotation apparatus application hydraulic motor
Realization prewhirl rotating function when, hydraulic motor is emptied, and output shaft twists off problem.The pre-rotation hydraulic circuit is easy to manufacture and can
Obtain reliable and stable working effect.
In order to solve the above technical problems, it is a feature of the present invention that including power plant module, control module, execution module, auxiliary
Help module.The power plant module is the power source of system, and pressure, speed and the direction of control module control fluid are so as to controlling
The action of executive component processed.
The power plant module includes constant pressure variable plunger pump（3）, motor（4）.The control module includes control oil path block
（10）, perform oil path block（20）.The execution module includes hydraulic motor（23）, rotary wheel base（25）, shaft coupling（24）, spinning roller
（26）.The supplementary module includes fuel tank（1）, air cleaner（2）, return filter（5）, oil cooling unit（6）, filter
（7）, liquid level gauge（8）, bleeder plug（9）.
Air cleaner in the supplementary module（2）Installed in fuel tank（1）Above, return filter（5）Installed in fuel tank
（1）Above, the return filter（5p）Mouth is connected to the control oil path block by pipe joint, hard tube（10t）Mouthful, liquid level gauge
（8）Installed in fuel tank（1）Side, oil cooling unit are connected to fuel tank by pipe joint, high-pressure rubber pipe（1）.
Hydraulic pump in the power plant module（3）With motor（4）It is direct-connected by shaft coupling, installed in the fuel tank（1）Above.
Hydraulic pump inlet port（3o）The fuel tank is connected to by pipe joint, hard tube（1）.Hydraulic pump oil-out（3p）By pipe joint,
High-pressure hose is connected to the control oil path block（10）'s（10p）Mouthful.
Pressure-reducing valve in the control module（14p）Mouth, overflow valve（15p）Mouth and pressure measuring tie-in（13a）Parallel connection passes through control
Oil path block（10）Middle loop is connected to control oil path block（10p）Mouthful, the hose coupling assembly（12a）One end connects the pressure measurement
Joint（13a）, other end connection pressure gauge（11a）.The overflow valve（15t）Mouth, the two-position two-way electromagnetic directional valve（16a）
Mouth, the pressure-reducing valve（14t）Mouth, the two-position four-way solenoid directional control valve（17t）Mouth, No. 1 check valve（18p）Mouthful with it is described
No. 2 check valves（19t）Mouth is in parallel to pass through the control oil path block（10）Middle loop is connected to control oil path block（10t）Mouthful.It is described
Pressure-reducing valve（14a）Mouth and the two-position four-way solenoid directional control valve（17p）Mouth is connected in parallel to the pressure measuring tie-in（13b）Mouthful.Institute
State hose coupling assembly（12b）One end connects the pressure measuring tie-in（13a）, the other end connection pressure gauge（11b）.Described two
Position four-way electromagnetic reversing valve（17a）Mouth is in control oil path block（10）In blocked by oil circuit.The two-position four-way solenoid directional control valve
（17b）Mouth and No. 1 check valve（18t）Mouth parallel connection is by controlling oil path block（10）Middle loop is connected to control oil path block（10a）Mouthful.
No. 2 check valves（19p）Mouth is by controlling oil path block（10）Middle loop is connected to control oil path block（10b）Mouthful.The execution
Oil path block（20p）Mouth is connected to the control oil path block by pipe joint, hard tube（10a）Mouthful.The execution oil path block（20t）Mouthful
The control oil path block is connected to by pipe joint, hard tube（10b）Mouthful.
The execution oil path block（20）, flow speed control valve（21a）P mouths, the flow speed control valve（21b）P mouths and the flow speed control valve
（21c）P mouth parallel connections by performing oil path block（20）Middle loop is connected to execution oil path block（20p）Mouthful.The flow speed control valve（21a）
T mouths and No. 3 check valves（22a）T mouths UNICOM by performing oil path block（20）Middle loop is connected to the execution oil circuit
Block（20a）Mouthful.The flow speed control valve（21b）T mouths and No. 3 check valves（22b）T mouth parallel connections by performing oil path block（20）
Middle loop is connected to the execution oil path block（20c）Mouthful.The flow speed control valve（21c）T mouths and No. 3 check valves（22c）T
Mouth parallel connection is by performing oil path block（20）Middle loop is connected to the execution oil path block（20e）Mouthful.No. 3 check valves（22a）
P mouths, No. 3 check valves（22b）P mouths and No. 3 check valves（22c）The parallel connection of p mouths pass through the execution oil path block
（20）Middle loop is connected to the execution oil path block（20t）Mouthful.Meanwhile No. 3 check valves（22a）P mouths and the execution
Oil path block（20b）Mouth UNICOM, No. 3 check valves（22b）P mouths and execution oil path block (20d) the mouth UNICOM, described No. 3
The p mouths of check valve (22c) and execution oil path block (20f) the mouth UNICOM.
The p mouths of the executive component (23a) connect described execution oil path block (20a) mouth, institute by pipe joint, high-pressure rubber pipe
The t mouths for stating executive component (23a) are connected to described execution oil path block (20b) mouth by pipe joint, high-pressure rubber pipe, described to perform member
The p mouths of part (23b) are connected to described execution oil path block (20c) mouth, the executive component (23b) by pipe joint, high-pressure rubber pipe
T mouths described execution oil path block (20d) mouth is connected to by pipe joint, high-pressure rubber pipe, the p mouths of the executive component (23c) lead to
Cross pipe joint, high-pressure rubber pipe is connected to described execution oil path block (20e) mouth, the t mouths of the executive component (23c) are connect by pipe
Head, high-pressure rubber pipe are connected to described execution oil path block (20f) mouth.
Brief description of the drawings
Accompanying drawing is for providing a further understanding of the present invention, and a part for constitution instruction, with following tool
Body embodiment is used to explain the present invention together, but is not construed as limiting the invention.In the accompanying drawings.
Fig. 1 is hydraulic schematic diagram of the present invention.
Fig. 2 is two-position two-way electromagnetic directional valve structure chart.
Fig. 3 is structure of relief valve figure.
Fig. 4 is structure of relief pressure valve figure.
Fig. 5 is two-position four-way solenoid directional control valve structure chart.
Fig. 6 is No. 1 one-way valve structures figure.
Fig. 7 is No. 2 one-way valve structures figures.
Fig. 8 is flow speed control valve structure chart.
Fig. 9 is No. 3 one-way valve structures figures.
Figure 10 is hydraulic motor structure figure.
Figure 11 is rotary wheel base structure chart.
Fig. 1 hydraulic schematic diagram label declarations
1 fuel tank
2 air cleaners
3 hydraulic pumps
4 motors
5 return filters
6 oil cooling units
7 filters
8 liquid level gauges
9 bleeder plugs
10 control oil path blocks
11 pressure gauges
12 hose coupling assemblies
13 pressure measuring tie-ins
14 pressure-reducing valves
15 overflow valves
16 two-position two-way electromagnetic directional valves
17 two-position four-way solenoid directional control valves
18 No. 1 check valves
19 No. 2 check valves
20 perform oil path block
21 flow speed control valves
22 No. 3 check valves
23 hydraulic motors
Embodiment
The present invention is described in detail below in conjunction with the accompanying drawings.It should be appreciated that embodiment described herein
It is merely to illustrate and explain the present invention, is not intended to limit the invention.
Using three spinning-roller spinning machine pre-rotation loops as example, illustrate the application in this loop, point out simultaneously, this loop is equally suitable
For the pre-rotation loop in other machine tools.
A kind of pre-rotation hydraulic circuit includes executive component, hydraulic motor, and the executive component includes two actuator ports,
Hydraulic fluid port p, hydraulic fluid port t.3 executive component hydraulic pressure motor oils p, t connect the execution oil path block hydraulic fluid port respectively（20a）、
（20b）、（20c）、（20d）、（20e）、（20f）, 3 flow speed control valves control 3 executive component hydraulic motors respectively
Rotating speed, i.e., the rotating speed of each executive component hydraulic motor can be controlled individually.If there are lathe multiple pre-rotations to perform
Element, then executive component quantity can be accordingly increased, increase performs oil path block upper hydraulic fluid port quantity and flow speed control valve, individual event valve number
Amount.
Pressure-reducing valve in the control module（14）For setting up pre-rotation motor charge oil pressure, change pressure-reducing valve（14）Pressure
Pre-rotation motor output torque size can be adjusted.Two-position four-way solenoid directional control valve in the control module（17）It is pre- for controlling
Rotation motor is opened, closing function.
During pre-rotation active rotation, pressure oil is by hydraulic pump outlet（3p）Mouth is got, by pipeline to control oil path block
（10p）Mouthful, by the control oil path block（10）Internal oil passages reach pressure-reducing valve（14p）Mouthful, the pressure set up according to pressure-reducing valve
Value decompression, hydraulic oil after decompression is from pressure-reducing valve（14a）Mouth outflow, by the control oil path block（10）It is internal to two four-ways
Reversal valve（17p）Mouthful, two position and four-way reversing valve electromagnet obtain electric, and valve element commutation, pressure oil flows to two position and four-way reversing valve
（17b）Mouthful, by the control oil path block（10）Inside flows to the oil path block（10a）Mouthful, pressure oil is from the oil path block
（10a）Mouth outflow flows to the oil path block by pipeline（20p）Mouthful,（20p）Mouth pressure oil passes through the oil path block（20）Middle oil
Road is divided into three pressure oils and flows to the flow speed control valve respectively（21p）Mouthful, by the flow speed control valve（21）After throttling, from the speed governing
Valve（21t）Mouth outflow, three pressure oils pass through the oil path block（20）Home loop and three check valves（22t）Mouth closes
And the oil path block is then flowed to respectively（20a）Mouthful,（20c）Mouthful,（20e）Mouthful, three pressure oil outflows connect respectively by pipeline
It is connected to the hydraulic motor（23p）Mouthful, the rotation of drive motor.Oil return is from the hydraulic motor（23t）Mouth outflow, described three
Hydraulic motor oil return flows to the oil path block respectively by pipeline（20b）、（20d）、（20f）Mouthful, the oil is passed through in three oil returns
Road block（20）Middle oil circuit and the check valve（22t）Mouth merges, and then passes through the oil path block（20）Middle oil circuit converges for one
Oil return circuit flows to the oil path block（20t）Mouthful, oil return flows to the oil path block by pipeline（10b）Mouthful, by the oil circuit
Block（10）Middle loop flows to the check valve（19p）Mouthful, by the check valve（19）, from the check valve（19t）Mouth outflow,
By the oil path block（10）Middle loop, the check valve（19t）Mouth and the check valve（18p）Mouth, the pressure-reducing valve（14t）
Mouth, the overflow valve（15t）Mouth merges, with the oil path block（10t）Mouth connection, last oil return flow to the oil path block（10t）
Mouthful, the oil path block is flowed out in oil return（10t）Mouth flows to the return filter by connecting line（5p）Mouthful, by the oil return
Filter（5）After filtering, oil return is from the return filter（5t）Mouth outflow, returns to the fuel tank（1）, realize pre-rotation loop
Active rotation.
When pre-rotation active rotation is converted to passive rotation, two four-way electromagnetic reversing valves（17）Electromagnet dead electricity,
Reversal valve enters transient process function, now two position and four-way reversing valve（17p）、（17t）、（17a）、（17b）Mouth is all obstructed,
In this transient process, passively there is oil suction chamber to the hydraulic motor in rotation（23p）Emptying phenomenon.If do not taken corresponding measure,
Spinning roller axle may be caused to twist off, the present invention uses check valve（18）, oil suction chamber repairing is given when hydraulic motor is emptied.It ensure that liquid
Reliably working when pressure motor active rotation switchs to passively rotate.
Affiliated two position and four-way reversing valve（17）Close, pressure oil reaches two position and four-way reversing valve（17p）Mouthful, before stopping
Enter, pressure reaches the constant pressure variable plunger pump（3）Set pressure, the constant pressure variable plunger pump variable keep pressure.Now
The executive component hydraulic motor（23）Passive rotation,（23p）Mouth oil suction,（23t）Mouth force feed,（23t）Pass through institute after mouth is fuel-displaced
State oil path block（20）Internal duct reaches the check valve（22p）Mouthful, pressure oil opens the check valve（22）, flow to the list
To valve（22t）Mouthful, pass through the oil path block（20）Internal duct flows to the oil path block（20a）,（20c）,（20e）Mouthful, pass through
Pipeline returns to the executive component hydraulic motor（23p）Cause for gossip now passively rotates.When this transient process active rotating speed and by turn
When speed difference is larger, easily there is the hydraulic motor（23t）Mouth is fuel-displaced can not to supply the hydraulic motor（23p）Confession oil,
There is emptying phenomenon, when the above situation occurs in the present invention, the check valve（18）It is opened, hydraulic oil is from the fuel tank by managing
Road is drawn onto the check valve（18p）Mouthful, by the check valve（18）Reach the check valve（18t）Mouthful, by the oil
Road block（10）Home loop flows to the oil path block（10a）Mouthful, the oil path block is connected to by exterior line（10p）Mouthful, so
Hydraulic oil passes through the check valve afterwards（22）The hydraulic motor is flowed to pipeline（23p）Mouthful, realize that hydraulic oil supplies, ensure not
There is emptying phenomenon.
When pre-rotation passively rotates, hydraulic motor becomes a hydraulic pump, and hydraulic motor (23p) mouth is oil suction
Chamber, hydraulic motor (23t) mouth is pumping cavity.Hydraulic oil circulates between hydraulic motor and the check valve (22).Realize
Pre-rotation motor passively rotates.
Claims (10)
1. the present invention proposes a kind of pre-rotation hydraulic circuit, main composition include power plant module, control module, execution module,
Supplementary module；Solve lathe pre-rotation apparatus application hydraulic motor realize prewhirl rotating function when, hydraulic motor be emptied problem and
Output shaft twists off problem；The pre-rotation hydraulic circuit is easy to manufacture and can obtain reliable and stable working effect.
A kind of 2. pre-rotation hydraulic circuit according to claim 1, it is characterised in that：The power plant module includes motor（4）,
Constant pressure variable plunger pump（3）.
3. power plant module according to claim 2, the constant pressure variable plunger pump（3）Using overhead installation form, pass through
Pipeline is connected to the fuel tank（1）.
A kind of 4. pre-rotation hydraulic circuit according to claim 1, it is characterised in that：The supplementary module includes air-filtering
Device（2）, fuel tank（1）, return filter（5）, oil cooling unit（6）, filter（7）, liquid level gauge（8）, bleeder plug（9）.
A kind of 5. pre-rotation hydraulic circuit according to claim 1, it is characterised in that：The control module includes oil path block
（10）And oil path block（20）.
6. control module according to claim 4, it is characterised in that the oil path block（10）Pass through power described in pipeline UNICOM
Module, the oil path block（20）Pass through oil path block described in pipeline UNICOM（10）.
7. oil path block according to claim 4（10）, it is characterised in that：Including overflow valve（15）, solenoid directional control valve（16）, pressure
Power table（13a）, pressure gauge（13b）, pressure-reducing valve（14）, check valve（18）, check valve（19）, solenoid directional control valve（17）.
8. oil path block according to claim 4（20）, it is characterised in that：Including flow speed control valve（21）, check valve（22）.
A kind of 9. pre-rotation hydraulic circuit according to claim 1, it is characterised in that：The execution module includes rotary wheel base
（25）, hydraulic motor（23）, shaft coupling（24）, spinning roller（26）.
10. execution module according to claim 9, it is characterised in that the hydraulic motor（23）Pass through the shaft coupling
（24）, ring flange be connected to the rotary wheel base（25）On.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710754372.7A CN107420361A (en) | 2017-08-29 | 2017-08-29 | A kind of pre-rotation hydraulic circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710754372.7A CN107420361A (en) | 2017-08-29 | 2017-08-29 | A kind of pre-rotation hydraulic circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107420361A true CN107420361A (en) | 2017-12-01 |
Family
ID=60435106
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710754372.7A Pending CN107420361A (en) | 2017-08-29 | 2017-08-29 | A kind of pre-rotation hydraulic circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107420361A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110043523A (en) * | 2018-01-17 | 2019-07-23 | 雷沃重工股份有限公司 | Prevent that being emptied hydraulic system and hydraulic system prevents being emptied method |
| CN111608967A (en) * | 2020-04-30 | 2020-09-01 | 太原科技大学 | Hydraulic pressing control system for spinning machine die |
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| GB820564A (en) * | 1954-09-09 | 1959-09-23 | Lodge And Shipley Company | Improvements in and relating to metal-working machines |
| JPH05201332A (en) * | 1992-01-27 | 1993-08-10 | Kayaba Ind Co Ltd | Wheel device of magnetic levitation type vehicle |
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| JPH05201332A (en) * | 1992-01-27 | 1993-08-10 | Kayaba Ind Co Ltd | Wheel device of magnetic levitation type vehicle |
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| CN101927285A (en) * | 2009-06-19 | 2010-12-29 | 江都东升机械制造有限公司 | Control oil circuit of a spinning, charging and discharging device of spinning head of spinning machine |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110043523A (en) * | 2018-01-17 | 2019-07-23 | 雷沃重工股份有限公司 | Prevent that being emptied hydraulic system and hydraulic system prevents being emptied method |
| CN110043523B (en) * | 2018-01-17 | 2022-01-21 | 潍柴雷沃重工股份有限公司 | Air suction prevention hydraulic system and air suction prevention method for hydraulic system |
| CN111608967A (en) * | 2020-04-30 | 2020-09-01 | 太原科技大学 | Hydraulic pressing control system for spinning machine die |
| CN111608967B (en) * | 2020-04-30 | 2022-05-10 | 太原科技大学 | Hydraulic pressing control system for spinning machine die |
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