CN111075983B - Dual-redundancy electromagnetic switch device - Google Patents
Dual-redundancy electromagnetic switch device Download PDFInfo
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- CN111075983B CN111075983B CN201911376956.0A CN201911376956A CN111075983B CN 111075983 B CN111075983 B CN 111075983B CN 201911376956 A CN201911376956 A CN 201911376956A CN 111075983 B CN111075983 B CN 111075983B
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- valve
- main valve
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- valve seat
- nozzle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/36—Valve members
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/02—Construction of housing; Use of materials therefor of lift valves
- F16K27/029—Electromagnetically actuated valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
- F16K31/122—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston
Abstract
The invention belongs to the field of electromagnetic switches, and discloses a dual-redundancy electromagnetic switch device which comprises a switch main body and an electromagnetic valve, wherein the switch main body comprises a shell and a pipe nozzle fixedly connected with the shell, a flow passage inlet is formed in the shell, a flow passage outlet is formed in the pipe nozzle, a valve seat is arranged between the shell and the pipe nozzle, a front main valve is arranged in an inner cavity of the valve seat, a through hole for communicating the inner cavity of the valve seat with the flow passage inlet is formed in the front main valve, a rear main valve is arranged in the inner cavity of the pipe nozzle, a through hole for communicating the inner cavity of the pipe nozzle with the flow passage inlet is formed in the rear main valve, a spring is arranged between the front main valve and the valve seat, a spring is arranged between the rear main valve and the pipe nozzle, an oil source opening communicated with a working opening of the electromagnetic valve is formed in the inner cavity of the valve seat, an oil source opening communicated with the working opening of the electromagnetic valve is formed in the inner cavity of the pipe nozzle, and a guide opening connected with a target oil tank is formed in the inner cavity of the electromagnetic valve. The electromagnetic switch has high reliability of switching off and closing, compact structure, avoids pressure loss of an internal flow passage, and can realize large flow and low flow resistance.
Description
Technical Field
The invention belongs to an electromagnetic switch device, and particularly relates to a dual-redundancy electromagnetic switch device.
Background
The electromagnetic switch is a switch device for controlling the oil level of an oil tank and is a necessary oil tank accessory of a fuel oil system, the electromagnetic switch is used for controlling the oil level of a target oil tank to be kept in a required range, the existing electromagnetic switch device has the problems of small drift diameter of the oil level control electromagnetic switch, large flow resistance of turning of a flow passage, low oiling speed and the like, meanwhile, the control on the closing redundancy is insufficient, and the reliability of the closing of the electromagnetic switch is low.
Disclosure of Invention
Aiming at the current situation of the existing oil level control electromagnetic switch and further promoting the reliability of the switching-off and the closing of the existing oil level control electromagnetic switch, the invention provides a dual-redundancy electromagnetic switch device.
The technical scheme of the invention is as follows:
a dual redundancy electromagnetic switching device comprising:
a switch body and a solenoid valve 17 connected to the switch body,
the switch body comprises a housing 1 and a nozzle 9 connected to the housing 1,
the front end of the shell 1 is provided with a flow passage inlet 18,
the rear end of the nozzle 9 is provided with a flow passage outlet 19,
a valve seat 5 is arranged between the shell 1 and the nozzle 9,
a front main valve 2 which can move back and forth is arranged between the valve seat 5 and the runner inlet 18, a front piston cavity is formed between the front main valve 2 and the valve seat 5,
a rear main valve 6 capable of moving back and forth is arranged between the valve seat 5 and the nozzle 9, and a rear piston cavity is formed between the rear main valve 6 and the nozzle 9;
the front main valve 2 is provided with a through hole for communicating the front piston cavity with the runner inlet 18,
the rear main valve 6 is provided with a through hole for communicating the rear piston cavity with the runner inlet 23,
a first spring 3 is arranged between the front main valve 2 and the valve seat 5,
a second spring 24 is arranged between the rear main valve 6 and the nozzle 9,
the front piston chamber is provided with a first source port 21,
the electromagnetic valve 17 is provided with a guide port 20 connected with a target oil tank, the electromagnetic valve is also provided with a working port connected with a switch main body,
the first oil source port 21 is communicated with a working port arranged on the electromagnetic valve 17 and is connected to a guide port 20 on the electromagnetic valve 17
The rear piston chamber is open with a second source port 22,
a third oil source port 25 is arranged on the runner inlet 23,
a U-shaped loop is arranged in the electromagnetic valve, one end of the U-shaped loop is connected with the second oil source port 22, and the other end of the U-shaped loop is connected with the third oil source port 25; the electromagnetic valve can control the on-off of the U-shaped loop.
The invention has the technical characteristics and further improvement that:
1. a drainage rod 4 is arranged on one side of a piston cavity in front of the valve seat 5, and the drainage rod 4 is used for limiting the front main valve 2.
2. A first sealing groove is formed in the outer diameter of the front main valve 2, and a first sealing ring 13 is arranged in the first sealing groove; and a second sealing groove is formed in the outer diameter of the rear main valve 6, and a second sealing ring 7 is arranged in the second sealing groove.
3. The outer diameter of the front main valve 2 is provided with an antifriction ring 12
4. A first sealing ring gasket is arranged on the end face of the front main valve 2 and used for closing the runner inlet 18; and a second sealing ring gasket is arranged on the end surface of the rear main valve 6 and used for closing the flow channel inlet 23.
5. A third sealing ring 11 is arranged between the shell 1 and the valve seat 5, a fifth sealing ring 26 is arranged between the nozzle 9 and the valve seat 5, and a fourth sealing ring 16 is arranged at the joint of the switch main body and the electromagnetic valve 17.
6. The front main valve 2 is provided with a guide seat 15, the guide seat 15 is provided with a through hole, and the through hole is used for communicating an inner cavity of the valve seat 5 with a flow passage inlet 18.
7. The solenoid valve 17 is a normally open solenoid valve.
8. When oil is not transported, the fuel pressure in the front piston cavity is equal to the pressure at the inlet of the flow passage, the fuel pressure in the rear piston cavity is equal to the pressure at the inlet of the flow passage, and the front main valve and the rear main valve are both closed under the action of the first spring and the second spring;
when oil is transported, the electromagnetic valve is powered off, the first oil source port is communicated with the guide port, the second oil source port is communicated with the third oil source port through a U-shaped loop in the electromagnetic switch, fuel oil in the front piston cavity flows into the guide port through the first oil source port and flows to the float valve in the target oil tank, and flows into the target oil tank from an oil spilling hole at the bottom of the float valve; at the moment, the fuel pressure of the front piston cavity is smaller than the fuel pressure at the inlet of the flow channel, the front main valve overcomes the elasticity of the first spring to open under the action of the fuel pressure at the inlet of the flow channel, and the fuel enters the front piston cavity and flows to the inlet of the flow channel;
the rear main valve overcomes the elasticity of the second spring to open under the action of the fuel pressure at the inlet of the flow channel, and the fuel flows to the rear piston cavity through the valve seat and flows to a target fuel tank through the flow channel outlet of the nozzle;
when the oil level in the oil tank rises to a normal full oil level, the float valve in the target oil tank is closed, and a passage between the guide port and the first oil source port of the front piston cavity is cut off; at the moment, the fuel pressure in the front piston cavity is equal to the fuel pressure at the inlet of the flow passage, the front main valve is closed under the action of the first spring, the oil way is cut off, and the oil transportation is finished when the oil pressure is normally closed.
9. When the oil pressure can not be normally closed, the oil level of the target oil tank rises to the emergency full oil level, the electromagnetic valve is electrified to close the passage between the second oil source port and the third oil source port, the fuel pressure in the rear piston cavity is equal to the fuel pressure at the inlet of the flow passage, the rear main valve is closed under the action of the second spring to cut off the oil path, and the oil transportation is finished.
The dual-redundancy electromagnetic switch device has the advantages that the dual-redundancy electromagnetic switch device adopts the pilot-operated dual-redundancy control, the switch main body is connected with the front main valve and the rear main valve in series, each main valve is provided with the respective piston cavity and the pressure relief channel, the actions of the main valves are independent and do not interfere with each other when the main valves are cut off, and the reliability of the cut-off and the closing of the electromagnetic switch is further improved; the shell forming the switch main body and the inner channel of the nozzle have compact structures and few turning of the flow channel, thereby avoiding the pressure loss of the inner flow channel and realizing large flow and low flow resistance; in addition, the valve seat, the front main valve, the pipe nozzle and the rear main valve are all in piston structures, so that the main valve is flexible in action, safe and reliable, long in service life, good in sealing performance and strong in pollution resistance due to the fact that the main valve is subjected to anti-wear design.
Drawings
FIG. 1 is a schematic diagram of the structural principle of the present invention;
in the figure: the valve comprises a shell body 1, a front main valve 2, a first spring 3, a drainage rod 4, a valve seat 5, a rear main valve 6, a second sealing ring 7, a first screw 8, a nozzle 9, a second screw 10, a third sealing ring 11, a wear reducing ring 12, a first sealing ring 13, a nut 14, a guide seat 15, a fourth sealing ring 16, an electromagnetic valve 17, a flow channel inlet 18, a flow channel outlet 19, a guide port 20, a first oil source port 21, a second oil source port 22, a flow channel inlet 23, a second spring 24, a third oil source port 25 and a fifth sealing ring 26.
Detailed Description
As shown in figure 1, the dual-redundancy electromagnetic switch device comprises a switch main body and an electromagnetic valve arranged on the switch main body, wherein the switch main body comprises a shell 1 and a pipe nozzle 9 fixedly connected with the shell, a flow channel inlet 18 is arranged in the shell, a flow channel outlet 19 is arranged in the pipe nozzle, a valve seat 5 is arranged between the shell 1 and the pipe nozzle 9, a front main valve 2 capable of moving back and forth is arranged between the valve seat 5 and the flow channel inlet 18, a rear main valve 6 capable of moving back and forth is arranged between the pipe nozzle 9 and the valve seat 5, a front piston cavity is formed between the flow channel inlet 18 and the valve seat 5, a rear piston cavity is formed between the valve seat 5 and the pipe nozzle 9, a through hole for communicating the front piston cavity with the flow channel inlet 18 is formed on the front main valve 2, a through hole for communicating the rear piston cavity with the flow channel inlet 23 is formed on the rear main valve 6, a first spring 3 is arranged between the front main valve 2 and the valve seat 5, a second spring 24 is arranged between the rear main valve 6 and the nozzle 9, a first oil source opening 21 is formed in the front piston cavity, the first oil source opening 21 is connected to a guide opening 20 on the electromagnetic valve, a second oil source opening 22 is formed in the rear piston cavity, a third oil source opening 25 is formed in the runner inlet, a U-shaped loop is arranged in the electromagnetic valve, one end of the U-shaped loop is connected with the second oil source opening 22, and the other end of the U-shaped loop is connected with the third oil source opening 25; the electromagnetic valve can control the on-off of the U-shaped loop. The electromagnetic valve is connected with a direct current power supply.
Furthermore, the inner cavity of the valve seat is provided with a drainage rod 4 for limiting the main valve.
Further, the outer diameter of the front main valve is provided with a first sealing groove, and a first sealing ring 13 is arranged in the first sealing groove.
Furthermore, the outer diameter of the front main valve is provided with an antifriction ring 12.
Further, the rear main valve is provided with a second sealing groove, and a fluorine-containing sealing ring 7 is arranged in the second sealing groove.
Furthermore, the end face of the front main valve is provided with a first sealing ring gasket for closing the runner inlet of the shell. The sealing ring gasket is vulcanized rubber.
Furthermore, a second sealing ring gasket for closing the flow passage outlet of the nozzle is arranged on the end face of the rear main valve.
Further, the solenoid valve 17 is a normally open type solenoid valve.
Furthermore, a third sealing ring 11 is arranged between the shell 1 and the valve seat 5, a fifth sealing ring 26 is arranged between the nozzle 9 and the valve seat 5, and a fourth sealing ring 16 is arranged at the joint of the switch main body and the electromagnetic valve 17.
Furthermore, the end face of the front main valve 2 is fixedly connected with a guide seat 15, a through hole for communicating the inner cavity of the valve seat 5 with the runner inlet 18 is formed in the guide seat 15, and a through hole for communicating the rear piston cavity with the runner inlet is formed in the rear main valve 6.
The dual-redundancy electromagnetic switch device is normally closed, a front piston cavity is formed between the front main valve 2 and the valve seat 5 at ordinary times, a rear piston cavity is formed between the rear main valve 6 and the inner cavity of the nozzle 9, fuel oil flows into the respective piston cavities through the through holes respectively, the pressure of the fuel oil in the front piston cavity is equal to that of the runner inlet 7, the pressure of the fuel oil in the rear piston cavity is equal to that of the inner cavity 23 of the valve seat 5, and the front main valve 2 and the rear main valve 6 are both closed under the action of the fuel oil pressure and the spring 9; when oil is transported, the electromagnetic valve 17 is powered off, so that a working port of the electromagnetic valve 17 is communicated with a first oil source port 21 in an inner cavity of the valve seat 5, a small amount of fuel enters the working port, flows to a float valve in a target oil tank through a guide port 20, and flows into the target oil tank from an oil spilling hole at the bottom of the float valve, at the moment, the fuel pressure in the piston cavity is always lower than the pressure at the position of the inlet 18 of the flow channel, the front main valve 2 is opened under the action of the fuel pressure at the inlet 18 of the flow channel by overcoming the fuel pressure in the front piston cavity and the spring force of the spring 3, the fuel flows backwards through the shell 1 and the valve seat 5, the rear main valve 6 is opened under the action of the fuel pressure at the inlet 23 of the flow channel by overcoming the fuel pressure in the rear piston cavity and the spring force of the spring 24, and then the fuel flows to the nozzle 9 through the valve seat 5 and flows to the target oil tank through the outlet 19 of the flow channel; when the oil level in the target oil tank rises to a normal full oil level, the float valve in the target oil tank is closed, the passage between the working port and the oil source port 21 in the inner cavity of the valve seat 5 is cut off, at the moment, the fuel pressure in the front piston cavity is equal to the pressure at the position of the flow passage inlet 18, the front main valve 2 moves downwards to close the flow passage inlet 18 under the action of the fuel pressure and the restoring force of the spring 3, the oil delivery oil way is cut off, and the oil delivery is finished.
If the oil pressure is closed and failed, the target oil tank oil level continues to rise to the emergency full oil level, the electromagnetic valve 17 is powered on, the passage between the second oil source port 22 of the rear piston cavity and the third oil source port 25 of the flow channel inlet 23 is closed, at the moment, the fuel pressure in the rear piston cavity is equal to the pressure at the flow channel inlet 23, the rear main valve 6 moves downwards to close the flow channel inlet 7 under the action of the fuel pressure and the restoring force of the spring 24, the oil conveying oil path is cut off, and the oil conveying is finished.
The invention relates to a dual-redundancy electromagnetic switch device, which adopts a pilot-operated dual-redundancy control, a switch main body is connected with a front main valve 2 and a rear main valve 6 in series, each main valve is provided with a respective piston cavity and a pressure relief channel, the actions of the main valves are independent and do not interfere with each other when the main valves are cut off, the reliability of the cut-off and the closing of an electromagnetic switch is further improved, the structures of the internal channels of a shell 1 and a nozzle 9 of the switch main body are compact, the turning of a flow channel is not more, the change of the drift diameters of the shell 1 and the nozzle 9 is less, the pressure loss of the internal flow channel is avoided, and the high flow rate and the low flow resistance can be realized.
Claims (8)
1. A dual redundancy electromagnetic switch device is characterized in that the device comprises a switch main body and an electromagnetic valve (17) connected with the switch main body,
the switch main body comprises a shell (1) and a nozzle (9) connected with the shell (1),
the front end of the shell (1) is provided with a flow passage inlet (18),
a flow passage outlet (19) is arranged at the rear end of the nozzle (9),
a valve seat (5) is arranged between the shell (1) and the nozzle (9),
a front main valve (2) which can move back and forth is arranged between the valve seat (5) and the runner inlet (18), a front piston cavity is formed between the front main valve (2) and the valve seat (5),
a rear main valve (6) capable of moving back and forth is arranged between the valve seat (5) and the nozzle (9), and a rear piston cavity is formed between the rear main valve (6) and the nozzle (9);
the front main valve (2) is provided with a through hole which is communicated with the front piston cavity and the runner inlet (18),
the rear main valve (6) is provided with a through hole which is communicated with the rear piston cavity and the runner inlet (23),
a first spring (3) is arranged between the front main valve (2) and the valve seat (5),
a second spring (24) is arranged between the rear main valve (6) and the nozzle (9),
the front piston cavity is provided with a first oil source port (21),
the electromagnetic valve (17) is provided with a guide port (20) connected with a target oil tank,
the first oil source port (21) is connected to a guide port (20) on the electromagnetic valve (17)
The rear piston cavity is provided with a second oil source port (22),
a third oil source port (25) is arranged on the runner inlet (23),
a U-shaped loop is arranged in the electromagnetic valve, one end of the U-shaped loop is connected with the second oil source port (22), and the other end of the U-shaped loop is connected with the third oil source port (25); the electromagnetic valve can control the on-off of the U-shaped loop.
2. A dual redundancy electromagnetic switching device, according to claim 1, wherein: and a drainage rod (4) is arranged on one side of the piston cavity in front of the valve seat (5), and the drainage rod (4) is used for limiting the front main valve (2).
3. A dual redundancy electromagnetic switching device, according to claim 2, wherein: a first sealing groove is formed in the outer diameter of the front main valve (2), and a first sealing ring (13) is arranged in the first sealing groove; and a second sealing groove is formed in the outer diameter of the rear main valve (6), and a second sealing ring (7) is arranged in the second sealing groove.
4. A dual redundancy electromagnetic switching device, according to claim 3, wherein: and the outer diameter of the front main valve (2) is provided with an antifriction ring (12).
5. A dual redundancy electromagnetic switching device, according to claim 4, wherein: a first sealing ring gasket is arranged on the end face of the front main valve (2) and used for closing the runner inlet (18); and a second sealing ring gasket is arranged on the end face of the rear main valve (6) and used for closing the flow channel inlet (23).
6. A dual redundancy electromagnetic switching device, according to claim 5, wherein: the shell (1) and be provided with third sealed ring (11) between valve seat (5), nozzle (9) with valve seat (5) between be provided with fifth sealed ring (26), the switch main part with the junction of solenoid valve (17) be provided with fourth sealed ring (16).
7. A dual redundancy electromagnetic switching device, according to claim 6, wherein: the front main valve (2) is provided with a guide seat (15), the guide seat (15) is provided with a through hole, and the through hole is used for communicating an inner cavity of the valve seat (5) with a runner inlet (18).
8. A dual redundancy electromagnetic switching device, according to claim 1, wherein: the electromagnetic valve (17) is a normally open electromagnetic valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911376956.0A CN111075983B (en) | 2019-12-27 | 2019-12-27 | Dual-redundancy electromagnetic switch device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911376956.0A CN111075983B (en) | 2019-12-27 | 2019-12-27 | Dual-redundancy electromagnetic switch device |
Publications (2)
| Publication Number | Publication Date |
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| CN111075983A CN111075983A (en) | 2020-04-28 |
| CN111075983B true CN111075983B (en) | 2021-10-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911376956.0A Active CN111075983B (en) | 2019-12-27 | 2019-12-27 | Dual-redundancy electromagnetic switch device |
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| CN (1) | CN111075983B (en) |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6053289A (en) * | 1983-09-01 | 1985-03-26 | Diesel Kiki Co Ltd | Double-seat solenoid valve |
| JPH07310702A (en) * | 1994-05-17 | 1995-11-28 | Yutani Heavy Ind Ltd | Hydraulic oil tank device for hydraulic work vehicle |
| JP4562885B2 (en) * | 2000-09-01 | 2010-10-13 | 愛三工業株式会社 | Bidirectional pilot type electromagnetic flow path on-off valve and bidirectional piping |
| CN105299239A (en) * | 2015-10-18 | 2016-02-03 | 宜宾三江机械有限责任公司 | Electromagnetic switch device |
| CN205503995U (en) * | 2016-01-21 | 2016-08-24 | 刘贤章 | Two -way conisphere valve and long -range safety monitoring system |
| CN106195375A (en) * | 2016-07-20 | 2016-12-07 | 郦强 | Pressure oil tank pressure-retaining valve apparatus |
| DE102016119063A1 (en) * | 2016-10-07 | 2018-04-12 | Eto Magnetic Gmbh | Electromagnetic valve device and use of such |
| CN106402444B (en) * | 2016-10-18 | 2019-01-11 | 中国核动力研究设计院 | A kind of pilot operated safety valve system |
| CN207893137U (en) * | 2017-11-22 | 2018-09-21 | 宜宾三江机械有限责任公司 | A kind of valve hard sealing structure |
| CN109519584A (en) * | 2018-09-12 | 2019-03-26 | 太重集团榆次液压工业(济南)有限公司 | Using the electronic major-minor oil tank changeover valve and application method of linear stepping motor |
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2019
- 2019-12-27 CN CN201911376956.0A patent/CN111075983B/en active Active
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