CN218000001U - Hydraulic loading safety protection device - Google Patents
Hydraulic loading safety protection device Download PDFInfo
- Publication number
- CN218000001U CN218000001U CN202222494046.6U CN202222494046U CN218000001U CN 218000001 U CN218000001 U CN 218000001U CN 202222494046 U CN202222494046 U CN 202222494046U CN 218000001 U CN218000001 U CN 218000001U
- Authority
- CN
- China
- Prior art keywords
- valve
- logic valve
- normally
- oil
- port
- 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.)
- Active
Links
Images
Landscapes
- Fluid-Pressure Circuits (AREA)
Abstract
The utility model belongs to the technical field of hydraulic pressure detection, specifically disclose a hydraulic pressure loading safety arrangement, including pipeline case and loading hydro-cylinder, the top of pipeline case is fixed and is provided with solenoid valve and servo valve, and the side of pipeline case is fixed and is provided with oil feed pipe, oil return pipe, first open logic valve, second open logic valve, first closed logic valve, second closed logic valve; a piston of the loading oil cylinder is fixedly provided with a displacement sensor, and a pipeline connected with the loading oil cylinder is provided with a plurality of pressure sensors; the electromagnetic valve, the servo valve, the displacement sensor and the pressure sensor are respectively and electrically connected with an external control system. The utility model discloses a switching that the realization of getting electric and losing electric of solenoid valve was to first open type logic valve, second open type logic valve, first closed type logic valve, second closed type logic valve controls, can cut off pressure fast and accomplish the pressure uninstallation, avoids damaging by the test product.
Description
Technical Field
The utility model belongs to the technical field of hydraulic pressure detects, in particular to hydraulic pressure loading safety arrangement.
Background
When a hydraulic system works, at the moment that an electromagnetic valve is opened or closed, a pressure supply pipeline and an oil return pipeline can generate strong pressure impact, namely pressure pulse, the hydraulic pulse is fatal harm to the hydraulic system, the system pipeline, a connecting piece, an actuating cylinder and the like can be broken, system accessories can be out of order, and serious accidents of equipment can be caused when the system accessories are serious. Therefore, testing of the hydraulic system is required.
Adopt high pressure generating device to detect hydraulic system among the prior art, when detecting, high pressure generating device simulation operating condition carries out the punching press to hydraulic system, and the job stabilization in hydraulic system later stage can be guaranteed to this process. However, the existing high-pressure generating device is lack of a safety protection device during hydraulic detection, and the hidden trouble of damaging a hydraulic system exists when the pressure exceeds the limit.
Therefore, it is an urgent technical problem to be solved by those skilled in the art to provide a new hydraulic loading safety protection device.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome and lack safety arrangement's defect when depositing to the hydraulic system test among the prior art, provide a hydraulic pressure loading safety arrangement.
The utility model provides a hydraulic loading safety protection device, which comprises a pipeline box and a loading oil cylinder, wherein the loading oil cylinder comprises a cylinder body and a piston, the piston is connected with the inner wall of the cylinder body in a sliding way, and the piston divides the cylinder body into a rod cavity and a rodless cavity; the top of the pipeline box is fixedly provided with a solenoid valve and a servo valve, and the side surface of the pipeline box is fixedly provided with an oil supply pipe, an oil return pipe, a first normally-open logic valve, a second normally-open logic valve, a first normally-closed logic valve and a second normally-closed logic valve; the tail end of the oil supply pipe is fixedly provided with an oil supply quick plug, the tail end of the oil return pipe is fixedly provided with an oil return quick plug, and the oil supply quick plug and the oil return quick plug are respectively communicated with an external hydraulic oil tank;
a three-way pipe is arranged at one end, far away from the oil supply quick plug, of the oil supply pipe, the oil supply pipe is communicated with a first joint of the three-way pipe, a second joint of the three-way pipe is communicated with the electromagnetic valve, the electromagnetic valve is respectively communicated with the first normally-open logic valve, the second normally-open logic valve, the first normally-closed logic valve and the second normally-closed logic valve through pipelines, the first normally-closed logic valve and the second normally-closed logic valve are respectively communicated with the loading oil cylinder through pipelines, and the first normally-open logic valve and the second normally-open logic valve are respectively communicated with the loading oil cylinder through pipelines; the third joint of the three-way pipe is communicated with the servo valve, and the servo valve is respectively communicated with the first normally closed logic valve and the second normally closed logic valve through pipelines;
the first normally open type logic valve and the second normally open type logic valve are respectively communicated with the oil return pipe;
a piston of the loading oil cylinder is fixedly provided with a displacement sensor, the displacement sensor is positioned outside the cylinder body, and a pipeline connected with the loading oil cylinder is provided with a plurality of pressure sensors;
the electromagnetic valve, the servo valve, the displacement sensor and the pressure sensor are respectively and electrically connected with an external control system.
The further scheme is that the oil port A of the first normally open logic valve and the oil port A of the first normally closed logic valve are respectively communicated with the rodless cavity of the loading oil cylinder through pipelines, and the oil port A of the second normally open logic valve and the oil port A of the second normally closed logic valve are respectively communicated with the rod cavity of the loading oil cylinder through pipelines.
The electromagnetic valve is communicated with a control oil port X of the first normally-open logic valve, a control oil port X of the second normally-open logic valve, a control oil port X of the first normally-closed logic valve and a control oil port X of the second normally-closed logic valve through pipelines respectively and is used for controlling the opening and closing states of the first normally-open logic valve, the second normally-open logic valve, the first normally-closed logic valve and the second normally-closed logic valve.
The further scheme is that an opening A of the servo valve is communicated with an oil opening B of the first normally-closed logic valve through a pipeline, and an opening B of the servo valve is communicated with an oil opening B of the second normally-closed logic valve through a pipeline.
The oil port B of the first normally-open logic valve and the oil port B of the second normally-open logic valve are respectively communicated with the oil return pipe through pipelines;
a throttling valve is arranged between the oil port B of the first normally open logic valve and the oil return pipe, and the throttling valve is respectively communicated with the oil port B of the first normally open logic valve and the oil return pipe;
and a throttle valve is arranged between the oil port B of the second normally open logic valve and the oil return pipe, and the throttle valve is respectively communicated with the oil port B of the second normally open logic valve and the oil return pipe.
In a further scheme, a T port of the servo valve is communicated with the oil return pipe through a pipeline.
The oil supply pipe is provided with a filter, and the filter is communicated with the oil supply pipe.
A load sensor is fixedly arranged at one end, far away from the cylinder body, of the piston of the loading oil cylinder, and the load sensor is electrically connected with an external control system;
and one end of the piston, which is far away from the cylinder body, is used for connecting hydraulic equipment to be tested.
Compared with the prior art, the beneficial effects of the utility model reside in that:
the utility model discloses a switching of the realization of getting electric and losing electric of solenoid valve to first open type logic valve, second open type logic valve, first closed type logic valve, second closed type logic valve controls, and then accomplishes loading cylinder's pressure boost and release, when pressure overload, can cut off pressure fast and accomplish the pressure uninstallation, avoids damaging by the trial production.
The utility model can make the loading oil cylinder in a follow-up state under the non-working state, and complete the necessary test of the loading oil cylinder; when the loading displacement exceeds the limit/the loading angle exceeds the limit, the torque loading exceeds the limit/the pulling pressure exceeds the limit, the emergency unloading is carried out under the abnormal conditions of emergency stop and the like, the output of the servo valve can be quickly cut off, and the purpose of protecting the tested piece is achieved.
The device has the advantages of simple structure, convenient use, low failure rate and stable performance; the device is small in size, can be conveniently moved to a proper position according to system requirements, can be installed separately from the servo hydraulic cylinder, can also be directly installed on the servo hydraulic cylinder without complex operation, and is simple to set.
Drawings
The following drawings are merely illustrative of and explanatory of the invention and are not intended to limit the scope of the invention, wherein:
FIG. 1: the utility model is a schematic diagram of the working principle;
FIG. 2: the utility model has a schematic structure;
FIG. 3: the utility model is a schematic diagram of an application state;
in the figure: 1. oil supply quick plug; 2. oil return and quick insertion; 3. a filter; 4. a throttle valve; 5. an electromagnetic valve; 6. a servo valve; 7. a first normally open logic valve; 8. a second normally open logic valve; 9. a first normally closed logic valve; 10. a second normally closed logic valve; 11. loading an oil cylinder; 11.1, a rod cavity; 11.2, a rodless cavity; 11.3, a piston; 12. a pressure sensor; 13. a displacement sensor; 14. a load sensor; 15. ball pivot bearing.
Detailed Description
In order to make the objects, technical solutions, design methods, and advantages of the present invention more clear, the present invention will be further described in detail by the following embodiments with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
As shown in fig. 1 and fig. 2, the utility model provides a hydraulic loading safety protection device, including pipeline case and loading cylinder 11, loading cylinder 11 includes cylinder body and piston 11.3, piston 11.3 with cylinder body inner wall sliding connection, piston 11.3 divides the cylinder body into have pole chamber 11.1 and no pole chamber 11.2; the top of the pipeline box is fixedly provided with a solenoid valve 5 and a servo valve 6, and the side of the pipeline box is fixedly provided with an oil supply pipe, an oil return pipe, a first normally open logic valve 7, a second normally open logic valve 8, a first normally closed logic valve 9 and a second normally closed logic valve 10; the tail end of the oil supply pipe is fixedly provided with an oil supply quick plug 1, the tail end of the oil return pipe is fixedly provided with an oil return quick plug 2, the oil supply quick plug 1 and the oil return quick plug 2 are respectively communicated with an external hydraulic oil tank, in order to ensure the oil supply quality, a filter 3 is arranged on the oil supply pipe, and the filter 3 is communicated with the oil supply pipe;
the quick oil supply device comprises an oil supply pipe, a three-way pipe, a first normally open logic valve 7, a second normally open logic valve 8, a first normally closed logic valve 9 and a second normally closed logic valve 10, wherein a three-way pipe is arranged at one end, far away from the oil supply quick plug 1, of the oil supply pipe, the oil supply pipe is communicated with a first joint of the three-way pipe, a second joint of the three-way pipe is communicated with an oil inlet of a solenoid valve 5, the solenoid valve 5 is respectively communicated with the first normally open logic valve 7, the second normally open logic valve 8, the first normally closed logic valve 9 and the second normally closed logic valve 10 through pipelines, and the opening and closing states of the first normally open logic valve 7, the second normally open logic valve 8, the first normally closed logic valve 9 and the second normally closed logic valve 10 are controlled through the power-on or power-off of the solenoid valve 5; the state is a non-supercharging state or an emergency stop state, and the hydraulic oil in the loading oil cylinder 11 can flow back to the hydraulic oil tank through the first normally-open logic valve 7 and the second normally-open logic valve 8; when the electromagnetic valve is in an electrified state, the first normally-closed logic valve 9 and the second normally-closed logic valve 10 are opened, the first normally-open logic valve 7 and the second normally-open logic valve 8 are closed, hydraulic oil in the hydraulic oil tank enters the rod cavity 11.2 or the rodless cavity 11.1 through the servo valve 6 respectively through the first normally-closed logic valve 9 or the second normally-closed logic valve 10, and pressurization of a tested hydraulic system is achieved.
In order to realize pressurization or pressure relief of the pressurization oil cylinder 11, an oil port A of the first normally open logic valve 7 and an oil port A of the first normally closed logic valve 9 are respectively communicated with a rodless cavity 11.2 of the loading oil cylinder 11 through pipelines, and an oil port A of the second normally open logic valve 8 and an oil port A of the second normally closed logic valve 10 are respectively communicated with a rod cavity 11.1 of the loading oil cylinder 11 through pipelines; the electromagnetic valve 5 is respectively communicated with a control oil port X of the first normally-open logic valve 7, a control oil port X of the second normally-open logic valve 8, a control oil port X of the first normally-closed logic valve 9 and a control oil port X of the second normally-closed logic valve 10 through pipelines; a third joint of the three-way pipe is communicated with a port P of the servo valve 6, a port A of the servo valve 6 is communicated with a port B of the first normally-closed logic valve 9 through a pipeline, a port B of the servo valve 6 is communicated with a port B of the second normally-closed logic valve 10 through a pipeline, and a port T of the servo valve 6 is communicated with the oil return pipe through a pipeline; the oil port B of the first normally-open logic valve 7 and the oil port B of the second normally-open logic valve 8 are respectively communicated with the oil return pipe through pipelines. In order to ensure stable oil return pressure, a throttle valve 4 is arranged between an oil port B of the first normally open logic valve 7 and an oil return pipe, and the throttle valve 4 is respectively communicated with the oil port B of the first normally open logic valve 7 and the oil return pipe; a throttle valve 4 is arranged between the oil port B of the second normally open logic valve 8 and the oil return pipe, and the throttle valve 4 is respectively communicated with the oil port B of the second normally open logic valve 8 and the oil return pipe.
In order to ensure that loading parameters of the loading oil cylinder 11 are accurately obtained, a displacement sensor 13 is fixedly arranged on a piston 11.3 of the loading oil cylinder 11, the displacement sensor 13 is positioned outside the cylinder body, a plurality of pressure sensors 12 are arranged on a pipeline connected with the loading oil cylinder 13, a load sensor 14 is fixedly arranged at one end, far away from the cylinder body, of the piston 11.3 of the loading oil cylinder 11, and the load sensor 14 is electrically connected with an external control system;
the electromagnetic valve 5, the servo valve 6, the displacement sensor 13, the load sensor 14 and the pressure sensor 12 are respectively electrically connected with an external control system.
In this embodiment, the port a of the servo valve 6 is an adjusting port for adjusting the oil inlet pressure of the rodless cavity 11.2, the port B of the servo valve 6 is an adjusting port for adjusting the oil inlet pressure of the rod cavity 11.1, the port P of the servo valve 3 is an oil inlet, is communicated with an oil supply pipe and is used for supplying hydraulic oil to the booster cylinder 11, and the port T of the servo valve 3 is an oil return port and is communicated with an external hydraulic oil tank for recovering the hydraulic oil; the oil ports a and B of the first normally-open logic valve 7, the second normally-open logic valve 8, the first normally-closed logic valve 9 and the second normally-closed logic valve 10 are oil passing ports, and the X ports of the first normally-open logic valve 7, the second normally-open logic valve 8, the first normally-closed logic valve 9 and the second normally-closed logic valve 10 are regulating ports and are all communicated with the oil outlet of the electromagnetic valve.
As shown in fig. 3, the utility model discloses when using, with solenoid valve 5, servo valve 6, displacement sensor 13, load sensor 14 and pressure sensor 12 respectively with external control system electric connection, realize the control to solenoid valve 5 and servo valve 6 through external control system, divide into two operating modes: an oil pressure unloading working condition and an oil pressure loading working condition; under the oil pressure uninstallation operating mode, the controller control solenoid valve loses the electricity, and hydraulic oil in the hydraulic oil tank can't pass through solenoid valve 5 promptly, and under this state, first closed logic valve 9, second closed logic valve 10 are closed, and first open logic valve 7, second open logic valve 8 are opened, and hydraulic oil in the pressurized cylinder 11 loops through first open logic valve 7/second open logic valve 8 choke valve 4 and gets into the hydraulic oil tank, plays the effect of uninstallation oil pressure, makes the moment of torsion loading system be in the follow-up state, and the protection is by the test piece. Under the working condition of oil pressure loading, the servo valve 4, the booster cylinder 11 and the load sensor 14 or the servo valve 4, the booster cylinder 11 and the displacement sensor 13 or the servo valve 4, the booster cylinder 11 and the pressure sensor 12 form a closed-loop control loop, and are loaded on a tested piece in real time according to a controller load instruction, at the moment, the controller controls the electromagnetic valve 5 to be electrified, hydraulic oil of the hydraulic oil tank respectively enters the electromagnetic valve 5 and the servo valve 6 through a three-way pipe, the hydraulic oil entering the electromagnetic valve 5 respectively reaches the control oil ports X of the first normally-open logic valve 7, the second normally-open logic valve 8, the first normally-closed logic valve 9 and the second normally-closed logic valve 10, so that the first normally-closed logic valve 9 and the second normally-open logic valve 10 are opened, the first normally-open logic valve 7 and the second normally-open logic valve 8 are closed, and the hydraulic oil passing through the closed logic valve 6 enters the booster cylinder 11 through the first normally-open logic valve 9 or the second normally-open logic valve 10, and plays a role of loading oil pressure. And a spherical hinge bearing 15 is arranged at one end of the piston 11.3, which is far away from the cylinder body, and the spherical hinge bearing 15 is connected with a connecting rod to drive the piston of the tested oil cylinder so as to transmit the loading pressure to the tested piece.
While various embodiments of the present invention have been described above, the above description is intended to be illustrative, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (8)
1. A hydraulic loading safety protection device comprises a pipeline box and a loading oil cylinder (11), wherein the loading oil cylinder (11) comprises a cylinder body and a piston (11.3), the piston (11.3) is connected with the inner wall of the cylinder body in a sliding mode, and the cylinder body is divided into a rod cavity (11.1) and a rodless cavity (11.2) by the piston (11.3); the hydraulic control system is characterized in that a solenoid valve (5) and a servo valve (6) are fixedly arranged at the top of the pipeline box, and an oil supply pipe, an oil return pipe, a first normally-open logic valve (7), a second normally-open logic valve (8), a first normally-closed logic valve (9) and a second normally-closed logic valve (10) are fixedly arranged on the side surface of the pipeline box; the tail end of the oil supply pipe is fixedly provided with an oil supply quick plug (1), the tail end of the oil return pipe is fixedly provided with an oil return quick plug (2), and the oil supply quick plug (1) and the oil return quick plug (2) are respectively communicated with an external hydraulic oil tank;
a three-way pipe is arranged at one end, far away from the oil supply quick plug (1), of the oil supply pipe, the oil supply pipe is communicated with a first joint of the three-way pipe, a second joint of the three-way pipe is communicated with the electromagnetic valve (5), the electromagnetic valve (5) is respectively communicated with the first normally-open logic valve (7), the second normally-open logic valve (8), the first normally-closed logic valve (9) and the second normally-closed logic valve (10) through pipelines, the first normally-closed logic valve (9) and the second normally-closed logic valve (10) are respectively communicated with the loading oil cylinder (11) through pipelines, and the first normally-open logic valve (7) and the second normally-open logic valve (8) are respectively communicated with the loading oil cylinder (11) through pipelines; the third joint of the three-way pipe is communicated with the servo valve (6), and the servo valve (6) is respectively communicated with the first normally closed logic valve (9) and the second normally closed logic valve (10) through pipelines;
the first normally open type logic valve (7) and the second normally open type logic valve (8) are respectively communicated with the oil return pipe;
a piston (11.3) of the loading oil cylinder (11) is fixedly provided with a displacement sensor (13), the displacement sensor (13) is positioned outside the cylinder body, and a pipeline connected with the loading oil cylinder (11) is provided with a plurality of pressure sensors (12);
the electromagnetic valve (5), the servo valve (6), the displacement sensor (13) and the pressure sensor (12) are respectively electrically connected with an external control system.
2. The hydraulic loading safety protection device according to claim 1, wherein the oil port a of the first normally open logic valve (7) and the oil port a of the first normally closed logic valve (9) are respectively communicated with the rodless cavity (11.2) of the loading cylinder (11) through pipelines, and the oil port a of the second normally open logic valve (8) and the oil port a of the second normally closed logic valve (10) are respectively communicated with the rod cavity (11.1) of the loading cylinder (11) through pipelines.
3. The hydraulic loading safety protection device according to claim 2, wherein the electromagnetic valve (5) is respectively communicated with the control port X of the first normally open logic valve (7), the control port X of the second normally open logic valve (8), the control port X of the first normally closed logic valve (9), and the control port X of the second normally closed logic valve (10) through pipelines, and is used for controlling the open/close states of the first normally open logic valve (7), the second normally open logic valve (8), the first normally closed logic valve (9), and the second normally closed logic valve (10).
4. A hydraulic loading safety protection device according to claim 3, characterized in that the port a of the servo valve (6) is communicated with the port B of the first normally closed logic valve (9) through a pipeline, and the port B of the servo valve (6) is communicated with the port B of the second normally closed logic valve (10) through a pipeline.
5. The hydraulic loading safety protection device according to claim 1, wherein the oil port B of the first normally open logic valve (7) and the oil port B of the second normally open logic valve (8) are respectively communicated with the oil return pipe through pipelines;
a throttle valve (4) is arranged between the oil port B of the first normally open logic valve (7) and the oil return pipe, and the throttle valve (4) is respectively communicated with the oil port B of the first normally open logic valve (7) and the oil return pipe;
and a throttle valve (4) is arranged between the oil port B of the second normally open logic valve (8) and the oil return pipe, and the throttle valve (4) is respectively communicated with the oil port B of the second normally open logic valve (8) and the oil return pipe.
6. A hydraulic loading safety arrangement according to claim 1, wherein the T-port of the servo valve (6) is in communication with the return line via a conduit.
7. A hydraulic loading safety arrangement according to claim 1, characterized in that the oil supply line is provided with a filter (3).
8. The hydraulic loading safety protection device according to claim 1, characterized in that a load sensor (14) is fixedly arranged at one end of the piston (11.3) of the loading oil cylinder (11) far away from the cylinder body, and the load sensor (14) is electrically connected with an external control system;
and one end of the piston (11.3) far away from the cylinder body is used for connecting hydraulic equipment to be tested.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222494046.6U CN218000001U (en) | 2022-09-19 | 2022-09-19 | Hydraulic loading safety protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222494046.6U CN218000001U (en) | 2022-09-19 | 2022-09-19 | Hydraulic loading safety protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218000001U true CN218000001U (en) | 2022-12-09 |
Family
ID=84290727
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222494046.6U Active CN218000001U (en) | 2022-09-19 | 2022-09-19 | Hydraulic loading safety protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218000001U (en) |
-
2022
- 2022-09-19 CN CN202222494046.6U patent/CN218000001U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101539218B (en) | Control module of high-pressure bypass pressure and temperature reducing valve actuating mechanism | |
| CN105257889A (en) | Electro-hydraulic driving system for sluice valve and sluice valve | |
| CN108757599B (en) | Hydraulic loading system and loading method for airplane ground test bed | |
| CN105003715A (en) | Brake valve electro-hydraulic drive system with emergency shut valve function and brake valve | |
| CN103148041A (en) | Energy-saving active/passive load double electrohydraulic servo valve control system and control method thereof | |
| CN108799212B (en) | A kind of emergency power power device of hydraulic system | |
| CN103629421A (en) | Valve control system | |
| CN218000001U (en) | Hydraulic loading safety protection device | |
| US6416033B1 (en) | Air over hydraulics actuator system | |
| CN110985462A (en) | Hydraulic system for eliminating pulse test actuating cylinder and pipeline gas thereof | |
| CN201464180U (en) | Hydraulic servomotor displacement test apparatus | |
| CN207661192U (en) | The automatic valve system of the single-action pneumatic executor driving of duplicate protection can be provided | |
| CN203745310U (en) | Pressure resistance test system for automobile air cylinder | |
| CN204755421U (en) | Take quiet loading system of aircraft wing of power -off protection | |
| CN115263831A (en) | Energy-saving hydraulic pressure maintaining device and control method thereof | |
| CN115214583A (en) | Control system of railway freight car electro-pneumatic brake valve | |
| CN106930988A (en) | Sound state bidirectional hydraulic loading device and its control method based on accumulator | |
| CN102269288A (en) | Self-operated axial flow pressure regulating valve capable of being completely opened in case of failure | |
| CN101979868A (en) | Spindle brake device for wind power generation hydraulic system | |
| CN111594496A (en) | Low-power-consumption flow self-adaptive hydraulic position closed-loop control system and method | |
| CN218818504U (en) | System for changing valve torque of pneumatic eccentric valve under high pressure | |
| CN205504110U (en) | Built -in diaphragm type telescoping valve | |
| CN212690513U (en) | Hydraulic loading device | |
| CN210033538U (en) | High-pressure continuous adjustment type servomotor for steam turbine | |
| CN220435178U (en) | Top bolt hydraulic control system on internal mixer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |