CN115653963A - Dual-redundancy servo valve block - Google Patents
Dual-redundancy servo valve block Download PDFInfo
- Publication number
- CN115653963A CN115653963A CN202211438291.3A CN202211438291A CN115653963A CN 115653963 A CN115653963 A CN 115653963A CN 202211438291 A CN202211438291 A CN 202211438291A CN 115653963 A CN115653963 A CN 115653963A
- Authority
- CN
- China
- Prior art keywords
- servo
- valve
- card
- casing
- shell
- 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
Images
Landscapes
- Servomotors (AREA)
Abstract
The invention relates to the technical field of servo valves and discloses a dual-redundancy servo valve block which comprises a support, wherein a shell is arranged at the top of the support, two servo valves are arranged at the top of the shell, an unloading valve is further arranged at the top of each of the two shells, a first hexagon socket screw plug is mounted outside the unloading valve, a pressure measuring joint is arranged at the top of the shell, two filter elements are arranged on the outer side wall of the shell, eight adjustable throttle valves are arranged on the outer side wall of the shell, a second two pipe joints are arranged on the outer side wall of the shell, two lifting ring screws are arranged at the top of the shell, a throttling hole is formed in the outer side wall of the shell, and a junction box is fixedly connected to the outer side wall of the support. This dual-redundancy servo valve block, the last filter that increases of servo valve block can guarantee oily cleanliness, prevents the servo valve bite, designs 2 servo valves, through control logic, can switch on line, guarantees that one of them servo valve has the problem, can not appear shutting down.
Description
Technical Field
The invention relates to the technical field of servo valves, in particular to a dual-redundancy servo valve block.
Background
The hydraulic control servo valve is mainly an electro-hydraulic servo valve which correspondingly outputs modulated flow and pressure after receiving an electric analog signal. The device is an electro-hydraulic conversion element and a power amplification element, and can convert a low-power weak electric input signal into high-power hydraulic energy (flow and pressure) for output. In an electro-hydraulic servo system, an electric part is connected with a hydraulic part to realize conversion of electro-hydraulic signals and hydraulic amplification. The electro-hydraulic servo valve is the core of the electro-hydraulic servo system control.
At present, servo valve blocks produced at home and abroad are all single servo valve control oil motors, the servo valves cannot be replaced on line, meanwhile, the position cannot be kept, the safety is lower, a redundant electro-hydraulic converter is arranged at a low pressure, the blank is filled, and no redundant servo valve block exists in a high-pressure system at present.
To this end, a dual redundant servo valve block is proposed to solve the problems mentioned in the background above.
Disclosure of Invention
The present invention is directed to a dual redundant servo valve block to solve the above problems.
In order to solve the technical problems, the invention provides the following technical scheme: the utility model provides a dual-redundancy servo valve block, includes the support, the top of support is provided with the casing, the top of casing is provided with two servo valves, two the top of casing still is provided with the unloading valve, the externally mounted of unloading valve has hexagon socket screw plug one, the top of casing is provided with the pressure measurement joint, be provided with two filter cores on the lateral wall of casing, be provided with eight adjustable choke valves on the lateral wall of casing, the top of casing is provided with solenoid valve one, be provided with seven hexagon socket screw plug two on the lateral wall of casing, be provided with three pipe connector one on the lateral wall of casing, be provided with two solenoid valve two on the lateral wall of casing, be provided with eleven hexagon socket screw plug three on the lateral wall of casing, be provided with two pipe connector two on the lateral wall of casing, the top of casing is provided with two rings screw, the orifice has been seted up on the lateral wall of casing, fixedly connected with the terminal box on the lateral wall of support.
Preferably, the top of the unloading valve is provided with a second hexagon socket head cap screw at a position close to four corners, and the unloading valve is fixedly connected with the shell through the second hexagon socket head cap screw.
Preferably, the two servo valves are symmetrically arranged at the top of the shell, four first socket cap screws are arranged on the outer side walls of the two servo valves, and the two servo valves are fixedly connected with the shell through the first socket cap screws.
Preferably, the first electromagnetic valve is arranged between the two servo valves, four third hexagon socket head cap screws are arranged on the outer side wall of the first electromagnetic valve, and the first electromagnetic valve is fixedly connected with the shell through the third hexagon socket head cap screws.
Preferably, a fourth inner hexagonal socket head cap screw is arranged between the support and the shell, and the support and the shell are fixedly connected through the fourth inner hexagonal socket head cap screw.
Preferably, the two lifting ring screws are diagonally arranged at the top of the shell, and the pressure measuring connector and the two lifting ring screws are diagonally arranged.
Preferably, the device adopts independent double-channel hydraulic control, and the two servo valves respectively correspond to the two control channels.
Preferably, the two filter elements are respectively arranged on two side faces of the outer side wall of the shell, which are deviated from each other, and the two filter elements are respectively arranged corresponding to the two servo valves.
Preferably, the hydraulic principle of the dual-redundancy servo valve block is further included, and specifically, high-pressure oil enters from a port P of the servo valve block and is divided into two paths, the pressure is 14MPA, the first path passes through the adjustable throttle valve 1, enters the servo valve 1, passes through a port A, and then passes through a port A of the isolation solenoid valve 1 and enters an upper cavity of the oil cylinder;
the second path of the first path passes through the adjustable throttle valve 2, enters the servo valve 2 and passes through the port A, then the oil is merged with the first path through an opening A of the isolation electromagnetic valve 2 and enters an upper cavity of the oil cylinder;
meanwhile, the port B of the servo valve is communicated with the port B of the isolation electromagnetic valve and a lower cavity of the oil engine;
if one valve is found to have a problem, the system can be automatically switched to the other valve, and simultaneously the system can give an alarm, so that the electromagnetic valve and the servo valve can be replaced on line only by manually closing all 4 adjustable throttle valves with the problem in the valve, and the machine set can not be stopped;
if the servo valves 1,2 have problems, the isolation electromagnetic valves can be electrified to prevent the servomotor from being closed, so that the position protection effect can be achieved, and operating personnel can replace the servo valves according to conditions to ensure the safety of the unit.
Preferably, the reconstruction logic of the dual redundant servo valve block is further included, and the reconstruction logic of the dual redundant servo valve block includes the following components:
1. the control logic of the newly added isolation solenoid valve is as follows:
a. the electromagnetic valve is manually operated to act or reset;
b. when the current electromagnetic valve corresponds to the servo card as a main card in the running state of the small machine, the servo card control is carried out;
when the loop fault or the deviation between the valve adjusting instruction and the feedback is more than 5%, the electromagnetic valve is electrified to act;
c. when the current servo card is switched to the main card from the standby card within three seconds, the isolation electromagnetic valve can not act;
2. the master-slave switching condition of the servo card is as follows:
a. main card DP communication failure (automatic switching inside the servo card);
b. a main card servo channel failure (automatic switching inside the servo card);
c. the two oil motors of the main card have stroke feedback faults (the servo card automatically switches inside);
d. the command and feedback deviation of the servomotor is more than 5 percent, and the servomotor is switched to a standby card (newly added logic);
e. a manual main/standby switching button (newly added logic);
3. two electromagnetic valve control buttons are added on the main picture, and a secondary confirmation function is provided;
4. the position feedback display of the valve cores of the two servo valves is added to the main picture;
5. the valve setting picture increases the state display of the master and slave servo cards and the setting function of the master and slave servo cards;
6. a manual switching button of a master servo card and a slave servo card is added to a valve setting picture, and a secondary confirmation function is provided;
7. and the valve setting picture is added with the stroke feedback analog quantity display and the state display of the servo servomotor.
Compared with the prior art, the invention has the following beneficial effects:
firstly, the servo valve block is additionally provided with the filter, so that the oil cleanliness can be ensured, and the jamming of the servo valve can be prevented.
Secondly, the invention designs 2 servo valves, and can switch on line through control logic, thereby ensuring that one servo valve has problems and does not stop.
Thirdly, the isolation solenoid valve is added, and under an extreme condition, if both servo valves are broken, the position can be kept.
Fourthly, the invention adds a manual function, and can replace the servo valve, the filter and the isolation electromagnetic valve on line.
Fifthly, the invention adds OPC function, and can realize quick closing control of the servomotor.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic top view of the present invention;
FIG. 3 is a schematic side view of the present invention;
FIG. 4 is a side view schematic of the present invention;
FIG. 5 is a schematic side view of the present invention;
FIG. 6 is a schematic side view of the present invention;
FIG. 7 is a hydraulic schematic of the present invention;
FIG. 8 is a schematic diagram of the redundant wiring of the present invention;
FIG. 9 is a diagram of a servo fault command according to the present invention.
Wherein: 1. a servo valve; 2. a first inner hexagonal socket head cap screw; 4. an unloading valve; 5. a second hexagon socket head cap head screw; 6. a first inner hexagonal plug screw; 10. a pressure measuring joint; 11. a filter element; 15. an adjustable throttle valve; 16. a first electromagnetic valve; 17. a third inner hexagonal socket head cap screw; 18. a second inner hexagonal plug screw; 19. a first pipe joint; 20. a second electromagnetic valve; 22. a third inner hexagonal plug screw; 23. a pipe joint II; 24. a housing; 25. a fourth inner hexagonal socket head cap screw; 26. a support; 27. a junction box; 40. a lifting eye screw; 41. an orifice.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Please refer to FIGS. 1-9
Example one
This embodiment is a specific implementation of a dual redundant servo valve block
The utility model provides a dual-redundancy servo valve block, including support 26, the top of support 26 is provided with casing 24, the top of casing 24 is provided with two servo valves 1, the top of two casing 24 still is provided with unloading valve 4, the externally mounted of unloading valve 4 has hexagon socket screw plug one 6, the top of casing 24 is provided with pressure measurement joint 10, be provided with two filter cores 11 on the lateral wall of casing 24, be provided with eight adjustable throttle valves 15 on the lateral wall of casing 24, the top of casing 24 is provided with solenoid valve one 16, the outside of solenoid valve one 16, be provided with seven hexagon socket screw plug two 18 on the lateral wall of casing 24, be provided with three pipe joint one 19 on the lateral wall of casing 24, be provided with two solenoid valve two 20 on the lateral wall of casing 24, be provided with eleven hexagon socket screw plug three 22 on the lateral wall of casing 24, be provided with two pipe joints two 23 on the lateral wall of casing 24, the top of casing 24 is provided with two rings screw 40, orifice 41 has been seted up on the lateral wall of casing 24, fixedly connected with terminal box 27 on the lateral wall of support 26.
Specifically, the positions, close to four corners, of the top of the unloading valve 4 are provided with two hexagon socket head cap screws 5, and the unloading valve 4 is fixedly connected with the shell 24 through the two hexagon socket head cap screws 5.
Specifically, two servo valves 1 are symmetrically arranged at the top of the shell 24, four inner hexagonal socket head cap screws 2 are arranged on the outer side walls of the two servo valves 1, and the two servo valves 1 are fixedly connected with the shell 24 through the inner hexagonal socket head cap screws 2.
Specifically, the first electromagnetic valve 16 is arranged between the two servo valves 1, four hexagon socket head cap screws third 17 are arranged on the outer side wall of the first electromagnetic valve 16, and the first electromagnetic valve 16 is fixedly connected with the shell 24 through the hexagon socket head cap screws third 17.
Specifically, a fourth hexagon socket head cap screw 25 is arranged between the bracket 26 and the housing 24, and the bracket 26 and the housing 24 are fixedly connected through the fourth hexagon socket head cap screw 25.
Specifically, two lifting ring screws 40 are diagonally arranged at the top of the housing 24, and the pressure measuring connector 10 is diagonally arranged with the two lifting ring screws 40.
Specifically, the device adopts independent double-channel hydraulic control, and the two servo valves 1 respectively correspond to two control channels.
Specifically, two filter elements 11 are respectively disposed on two side surfaces of the outer side wall of the housing 24, which are deviated from each other, and the two filter elements 11 are respectively disposed corresponding to the two servo valves 1.
Example two
The embodiment is a specific implementation mode of a hydraulic principle of a dual-redundancy servo valve block
As shown in fig. 7
According to the hydraulic principle of the dual-redundancy servo valve block, high-pressure oil enters from a P port of the servo valve block and is divided into two paths, the pressure is 14MPA, the first path passes through an adjustable throttle valve 1, enters the servo valve 1, passes through an A port, then passes through an A port of an isolation electromagnetic valve 1 with the sequence number of 20, and enters an upper cavity of an oil cylinder.
The second path of the first path passes through the adjustable throttle valve 2, enters the servo valve 2 and passes through the port A, then the oil is merged with the first path through an A port of the isolation electromagnetic valve 2 and enters an upper cavity of the oil cylinder.
Meanwhile, the port B of the servo valve is communicated with the port B of the isolation electromagnetic valve and a lower cavity of the oil engine.
If one of the valves is found to have a problem, the system can be automatically switched to the other valve, meanwhile, the alarm can be given out, the electromagnetic valve and the servo valve can be replaced on line only by manually closing all the 4 adjustable throttle valves with the problem in the other valve, and the machine set can not be stopped.
If the servo valves 1,2 have problems, the isolation electromagnetic valves can be electrified to prevent the servomotor from being closed, so that the position-keeping function can be achieved, and operators can replace the servo valves according to conditions. The safety of the unit is ensured.
The gate regulating oil cylinder is controlled by independent double-channel hydraulic pressure. Each channel is provided with an electro-hydraulic servo valve, an electromagnetic directional valve and a manual isolating valve, and a high-pressure precise filter element (5 mu m) is arranged on an oil inlet passage of the servo valve. The two hydraulic control channels are mutually independent and do not interfere with each other, an electro-hydraulic servo valve of each hydraulic control channel is controlled by an independent servo card, two LVDT stroke feedbacks are respectively connected to redundant servo modules, the redundant servo cards are connected by a special redundant line, the two channels mutually work in hot standby mode, and the switching time of the servo cards is less than or equal to 10ms.
When the configuration logic of the controller judges that the SO output instruction and the DDV valve core feedback deviation is large, the system automatically judges and gives a closing instruction of a locking valve of the servo valve, simultaneously cuts off a corresponding servo card output instruction, cuts off an oil way through the action of an isolation electromagnetic valve, isolates an abnormal servo valve, and isolates each oil way of the abnormal electro-hydraulic servo valve through four manual stop valves to realize the mechanical isolation of the electro-hydraulic servo valve. Therefore, the abnormal electro-hydraulic servo valve can be maintained and replaced, and operations such as filter element replacement and the like can be carried out.
When the abnormal electro-hydraulic servo valve is maintained normally, the four manual stop valves are opened to remove the mechanical isolation, so that the electro-hydraulic servo valve is in a hot state.
EXAMPLE III
As shown in fig. 7-9
This embodiment is a specific implementation of the reconstruction logic of a dual redundant servo valve block
A retrofit logic for a dual redundant servo valve block comprising the sub-items:
1. the control logic of the newly added isolation solenoid valve is as follows:
a. the manual operation solenoid valve acts or resets;
b. when the small machine is in a running state and the current electromagnetic valve corresponds to the servo card and is the main card, servo card control is carried out;
when the loop fault or the deviation between the valve adjusting instruction and the feedback is more than 5%, the electromagnetic valve is electrified to act;
c. and the isolation solenoid valve can not act within three seconds when the current servo card is switched from the standby card to the main card.
2. The master-slave switching condition of the servo card is as follows:
a. main card DP communication failure (automatic switching inside the servo card);
b. a main card servo channel failure (automatic switching inside the servo card);
c. the two oil motors of the main card have stroke feedback faults (the servo card automatically switches inside);
d. the command and feedback deviation of the servomotor is more than 5%, and the servomotor is switched to a standby card (newly added with logic);
e. and a manual main/standby switching button (newly added logic).
3. Two electromagnetic valve control buttons are added on the main picture, and a secondary confirmation function is provided.
4. The main picture is added with the position feedback display of the valve cores of the two servo valves.
5. The valve setting picture increases the state display of the master and slave servo cards and the setting function of the master and slave servo cards.
6. A master-slave servo card manual switching button is added to a valve setting picture, and a secondary confirmation function is achieved.
7. And the valve setting picture is added with the stroke feedback analog quantity display and the state display of the servo servomotor.
Test verification: after the servomotor is set, the servomotor is normally started and then the following test is carried out.
Hand test
And (4) stopping the solenoid valve button on the manual operation picture until the solenoid valve acts normally.
And manually operating a master-slave switching button of the servo card, and normally switching the master-slave of the servo card.
Automatic switching test
The main card is powered off, the standby card is lifted, and the disturbance of the servomotor is less than 1%.
The DP communication of the main card is interrupted, the standby card is lifted, and the disturbance of the servomotor is less than 1 percent.
The main card effectively feeds back disconnection of the LVDT, feeds back switching of the LVDT, disturbance of the servomotor is less than 1%, and the main card and the standby card are not switched.
And when the valve position feedback and the command deviation are more than 5%, the main card hydraulic pressure is cut off to lock the electromagnetic valve, and the standby card lifts the main engine and controls the servomotor to return to the command position. Note that this switch requires a decision command and feedback > 5%, so it is a nuisance switch.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described above, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A dual redundant servo valve block comprising a bracket (26), characterized in that: the top of support (26) is provided with casing (24), the top of casing (24) is provided with two servo valve (1), two the top of casing (24) still is provided with unloading valve (4), the externally mounted of unloading valve (4) has hexagon socket head cap screw (6), the top of casing (24) is provided with pressure measurement joint (10), be provided with two filter core (11) on the lateral wall of casing (24), be provided with eight adjustable choke valve (15) on the lateral wall of casing (24), the top of casing (24) is provided with solenoid valve (16), be provided with seven hexagon socket head cap screw (18) on the lateral wall of casing (24), be provided with three pipe joint (19) on the lateral wall of casing (24), be provided with two solenoid valve (20) on the lateral wall of casing (24), be provided with eleven hexagon socket head cap screw (22) on the lateral wall of casing (24), be provided with two pipe joint (23) on the lateral wall of casing (24), the top of casing (24) is provided with two rings (40), the orifice screw (41) has been seted up on the lateral wall of casing (24), be connected with on the fixed connection of support (27) the lateral wall.
2. A dual redundant servo valve block of claim 1, wherein: and the positions, close to four corners, of the top of the unloading valve (4) are provided with second hexagon socket head cap screws (5), and the unloading valve (4) is fixedly connected with the shell (24) through the second hexagon socket head cap screws (5).
3. A dual redundant servo valve block of claim 1, wherein: the two servo valves (1) are symmetrically arranged at the top of the shell (24), four inner hexagonal socket head cap screws (2) are arranged on the outer side wall of each servo valve (1), and the two servo valves (1) are fixedly connected with the shell (24) through the inner hexagonal socket head cap screws (2).
4. A dual redundant servo valve block of claim 1, wherein: the first electromagnetic valve (16) is arranged between the two servo valves (1), four inner hexagonal socket head cap screws III (17) are arranged on the outer side wall of the first electromagnetic valve (16), and the first electromagnetic valve (16) and the shell (24) are fixedly connected through the inner hexagonal socket head cap screws III (17).
5. A dual redundant servo valve block of claim 1, wherein: and a fourth inner hexagonal socket head cap screw (25) is arranged between the support (26) and the shell (24), and the support (26) and the shell (24) are fixedly connected through the fourth inner hexagonal socket head cap screw (25).
6. A dual redundant servo valve block of claim 1, wherein: the two lifting ring screws (40) are diagonally arranged at the top of the shell (24), and the pressure measuring connector (10) and the two lifting ring screws (40) are diagonally arranged.
7. A dual redundant servo valve block according to claim 1, wherein: the device adopts independent double-channel hydraulic control, and the two servo valves (1) respectively correspond to the two control channels.
8. A dual redundant servo valve block according to claim 1, wherein: the two filter elements (11) are respectively arranged on two sides of the outer side wall of the shell (24) which are deviated from each other, and the two filter elements (11) are respectively arranged corresponding to the two servo valves (1).
9. A dual redundant servo valve block of claim 1, wherein: the hydraulic principle of the dual-redundancy servo valve block is that high-pressure oil enters from a port P of the servo valve block and is divided into two paths, the pressure is 14MPA, the first path passes through the adjustable throttle valve 1, enters the servo valve 1, passes through a port A, then passes through a port A of the isolation solenoid valve 1 and enters an upper cavity of the oil cylinder;
the second path of the first path passes through the adjustable throttle valve 2, enters the servo valve 2 and passes through the port A, then the oil is merged with the first path through an opening A of the isolation electromagnetic valve 2 and enters an upper cavity of the oil cylinder;
meanwhile, the port B of the servo valve is communicated with the port B of the isolation electromagnetic valve and a lower cavity of the oil engine;
if one valve is found to have a problem, the system can be automatically switched to the other valve, and simultaneously the system can give an alarm, so that the electromagnetic valve and the servo valve can be replaced on line only by manually closing all 4 adjustable throttle valves with the problem in the valve, and the machine set can not be stopped;
if the servo valves 1,2 have problems, the isolation electromagnetic valves can be electrified to prevent the servomotor from being closed, so that the position protection effect can be achieved, and operating personnel can replace the servo valves according to conditions to ensure the safety of the unit.
10. A dual redundant servo valve block according to claim 1, wherein: the reconstruction logic of the dual-redundancy servo valve block comprises the following subsections:
(1) the control logic of the newly added isolation solenoid valve is as follows:
a. the manual operation solenoid valve acts or resets;
b. when the current electromagnetic valve corresponds to the servo card as a main card in the running state of the small machine, the servo card control is carried out;
when the loop fault or the deviation between the valve adjusting instruction and the feedback is more than 5%, the electromagnetic valve is electrified to act;
c. when the current servo card is switched from the standby card to the main card within three seconds, the isolation solenoid valve cannot act;
(2) and the master-slave switching condition of the servo card:
a. main card DP communication failure (automatic switching inside the servo card);
b. a main card servo channel failure (automatic switching inside the servo card);
c. the two oil motors of the main card have stroke feedback faults (the servo card automatically switches inside);
d. the command and feedback deviation of the servomotor is more than 5%, and the servomotor is switched to a standby card (newly added with logic);
e. a manual main/standby switching button (newly added logic);
(3) two electromagnetic valve control buttons are added on the main picture, and a secondary confirmation function is provided;
(4) the position feedback display of the valve cores of the two servo valves is added to the main picture;
(5) the valve setting picture is added with the status display of the master and slave servo cards and the setting function of the master and slave servo cards;
(6) a manual switching button of a master servo card and a slave servo card is added to a valve setting picture, and a secondary confirmation function is provided;
(7) and the valve setting picture is added with the stroke feedback analog quantity display and the state display of the servo servomotor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211438291.3A CN115653963A (en) | 2022-11-16 | 2022-11-16 | Dual-redundancy servo valve block |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211438291.3A CN115653963A (en) | 2022-11-16 | 2022-11-16 | Dual-redundancy servo valve block |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115653963A true CN115653963A (en) | 2023-01-31 |
Family
ID=85017324
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211438291.3A Pending CN115653963A (en) | 2022-11-16 | 2022-11-16 | Dual-redundancy servo valve block |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115653963A (en) |
-
2022
- 2022-11-16 CN CN202211438291.3A patent/CN115653963A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203405698U (en) | Fixed winch type hoist intelligent control system | |
| CN106685311B (en) | A kind of low-tension motor universal control circuit and method based on programmable protector | |
| US20070244579A1 (en) | Apparatus and method for restricting power delivery | |
| CN105119366A (en) | Dual-transformer low-voltage power switch connection switching system and working method thereof | |
| CN218542769U (en) | Dual-redundancy servo valve block | |
| CN115653963A (en) | Dual-redundancy servo valve block | |
| CN201990985U (en) | Dam double cylinder hydraulic gate intelligent control system | |
| CN201153219Y (en) | Auto-switch-on ring network cabinet for PLC controlled double electricity supply | |
| CN201575222U (en) | Switch control and protection device for non-integration electrically-operated valve | |
| CN205744009U (en) | A kind of steam turbine porthole controlling test circuit | |
| CN112377475A (en) | Automatic control system for pipeline groove | |
| CN214225287U (en) | Automatic fault diagnosis system for electric valve in electric system | |
| CN108662245B (en) | Anti-jamming and anti-freezing control device and control method for electric regulating valve | |
| CN114944703A (en) | Remote power cut-off and transmission system with electricity testing function | |
| CN203477560U (en) | Self-lock device of double-acting pneumatic actuator | |
| CN210948811U (en) | Emergency trip device | |
| CN210110579U (en) | Medium-voltage switch cabinet mechanical interlocking mechanism | |
| CN217270592U (en) | Guide vane action safety control system of hydraulic generator | |
| CN209100189U (en) | A kind of governor power down self-sustaining self-closing device | |
| CN203456940U (en) | Power supply device for steam turbine high voltage blocking control module | |
| CN201340538Y (en) | PLC monitoring cabinet of hydraulic hoist | |
| CN109236803A (en) | It is a kind of for the hydraulic system with function of redundancy protection | |
| CN216077047U (en) | Quick shearing device of blowout preventer control system | |
| CN210565264U (en) | A sulfur dioxide fan frequency conversion economizer for making acid | |
| CN103470843A (en) | Double-acting pneumatic actuator self-lock device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |