CN110953386B - Novel hydraulic support safety valve and application thereof - Google Patents

Novel hydraulic support safety valve and application thereof Download PDF

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Publication number
CN110953386B
CN110953386B CN201911272797.XA CN201911272797A CN110953386B CN 110953386 B CN110953386 B CN 110953386B CN 201911272797 A CN201911272797 A CN 201911272797A CN 110953386 B CN110953386 B CN 110953386B
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valve
valve core
cavity
pilot valve
pilot
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CN110953386A (en
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王成龙
苗根远
高远
魏学谦
陈萌
曾庆良
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Shandong University of Science and Technology
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Shandong University of Science and Technology
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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
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
    • F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
    • F16K17/10—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with auxiliary valve for fluid operation of the main valve
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
    • E21D15/14—Telescopic props
    • E21D15/44—Hydraulic, pneumatic, or hydraulic-pneumatic props
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
    • E21D15/50—Component parts or details of props
    • E21D15/51—Component parts or details of props specially adapted to hydraulic, pneumatic, or hydraulic-pneumatic props, e.g. arrangements of relief valves
    • E21D15/512—Arrangement of valves
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
    • E21D23/16—Hydraulic or pneumatic features, e.g. circuits, arrangement or adaptation of valves, setting or retracting devices
    • 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
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
    • F16K17/164—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side and remaining closed after return of the normal pressure
    • 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
    • F16K31/04—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor
    • F16K31/047—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor characterised by mechanical means between the motor and the valve, e.g. lost motion means reducing backlash, clutches, brakes or return means
    • 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
    • F16K31/0644—One-way valve
    • F16K31/0655—Lift valves
    • 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
    • F16K31/36—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor
    • F16K31/40—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor with electrically-actuated member in the discharge of the motor
    • F16K31/406—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor with electrically-actuated member in the discharge of the motor acting on a piston
    • 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
    • F16K31/44—Mechanical actuating means
    • F16K31/50—Mechanical actuating means with screw-spindle or internally threaded actuating means

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Structural Engineering (AREA)
  • Safety Valves (AREA)

Abstract

The invention relates to a novel hydraulic support safety valve and application thereof, wherein the novel hydraulic support safety valve comprises a valve body, a valve core, a reset spring and a pilot valve; the valve core is arranged in a valve core cavity formed in the valve body, the pilot valve is arranged in a pilot valve cavity formed in the valve body, the reset spring is positioned in the top end of the valve core and a spring cavity formed in the valve body, the pilot valve cavity and the valve core cavity are communicated through two control oil flow channels, magnetorheological fluid is filled in the pilot valve cavity, and emulsion is filled in the valve core cavity. The safety valve is combined with the pressure sensor and the controller which are arranged on the cylinder in the hydraulic support, the pressure sensor detects a conducted pressure signal and the controller analyzes the pressure value, so that the action of a pilot valve of the safety valve is controlled, and the response time of the pressure signal of the traditional safety valve conducted by a hydraulic system is shortened. The magnetorheological fluid is adopted to control the action of the pilot valve core, the extremely short response time of the magnetorheological fluid is relied on, and the magnetorheological fluid has a fast and efficient working process.

Description

Novel hydraulic support safety valve and application thereof
Technical Field
The invention relates to a novel hydraulic support safety valve and application thereof, in particular to a magnetorheological fluid controlled safety valve used on a hydraulic support, and belongs to the technical field of valves.
Background
With the increasing exhaustion of underground shallow coal resources, the development of coal mine production towards large excavation depth is a necessary trend, and the accompanying problems are the phenomenon of abrupt increase of supporting pressure of a coal mine working face and frequent rock burst. In order to solve the impact problem in the working process, most of the existing coal mine hydraulic supports adopt a measure of additionally installing a large-flow safety valve, but in practical application, the existing large-flow safety valve cannot respond in time when impact occurs, so that the hydraulic support is structurally damaged, and even casualties are caused. The main reason for the phenomenon is that the time acting on the upright post of the hydraulic support is very short when impact occurs, certain time is needed for transmitting impact pressure to the valve core of the high-flow safety valve through oil in the upper cavity and the lower cavity of the upright post after the impact pressure acts on the support, and certain time is needed for the valve core of the high-flow safety valve to overcome the action of the spring; the sum of these two periods of time exceeds the duration of the impact pressure, causing the impact energy to fail to unload in time. Huge impact energy is released through the deformation of the hydraulic support, so that the hydraulic support is deformed and destabilized due to structural damage, and coal mine safety accidents are caused. Chinese patent documents CN107725083A and CN103953369A provide a resetting method for a hydraulic support safety valve using nitrogen to reset a valve element, and compared with a conventional safety valve using a spring to reset, the resetting method for a valve element using gas as an elastic material has a faster response speed, but compressed gas is an elastic body and has the same elastic modulus, and the response speed still has a room for improvement.
Aiming at the problem of longer response time of the existing upright post-safety valve combined system, the invention provides a hydraulic support safety valve based on magnetorheological fluid control, and provides a new solution for solving the reliability of a support under an impact working condition. The safety valve adopts an electric control part and a magnetorheological fluid control part, so that the problems of overlong hydraulic impact transmission time and spring response time of the traditional safety valve can be solved respectively.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a novel hydraulic support safety valve which is controlled based on magnetorheological fluid, can solve the problem that the response time of the traditional safety valve of a hydraulic support is longer, can quickly release pressure, avoids deformation of the hydraulic support and ensures safe operation of the hydraulic support.
The invention also provides a working method of the novel hydraulic support safety valve.
The technical scheme of the invention is as follows:
a novel hydraulic support safety valve comprises a valve body, a valve core, a reset spring and a pilot valve; the valve core is arranged in a valve core cavity formed in the valve body, the pilot valve is arranged in a pilot valve cavity formed in the valve body, the reset spring is positioned in the top end of the valve core and a spring cavity formed in the valve body, the pilot valve cavity and the valve core cavity are communicated through two control oil flow channels, magnetorheological fluid is filled in the pilot valve cavity, and emulsion is filled in the valve core cavity.
Preferably, the valve body comprises a shell, a valve seat, an end cover and a plug; the shell is arranged on the valve seat, the liquid inlet is formed in the shell and is communicated with the valve core cavity, the valve core cavity is located in the shell in the vertical direction, the pilot valve cavity is located in the shell in the horizontal direction, one end of the pilot valve cavity is packaged through the end cover, the other end of the pilot valve cavity is packaged through the plug, the bottom of the valve seat is packaged through the end cover, and the valve seat is provided with the flow relief port and is communicated with the valve core cavity.
Preferably, the valve core is in a cross structure, the spring cavity is formed in the top end of the valve core, and two through control oil flow passages are axially formed in the valve core.
Preferably, the bottom end of the valve core is provided with a conical body, and when the valve core descends, the conical body can block the discharge port on the valve seat.
Preferably, the pilot valve comprises a motor, a screw rod, a nut, a piston, an electromagnetic coil and a pilot valve core which are sequentially arranged from left to right; the motor is connected with the transmission of lead screw one end, and nut and lead screw threaded connection, magnetorheological suspensions are located between piston and the pilot valve core, and solenoid is provided with the damping hole axially.
Preferably, a displacement sensor is arranged in the pilot valve cavity and is positioned on one side of the motor.
Preferably, the output shaft of the motor is in transmission connection with one end of the screw rod through a coupler.
Preferably, the pilot valve cavity is a stepped cavity and comprises a large cavity and a small cavity, and the two control oil flow passages are respectively communicated with the large cavity and the small cavity; one end of the pilot valve core is a cone, the pilot valve core is arranged in the large cavity, and when the pilot valve core moves, the cone can block the small cavity.
Preferably, the return spring comprises a disc spring, a rubber spring and a gas spring.
The working method of the novel hydraulic support safety valve is characterized in that the safety valve is installed on a hydraulic support stand column control oil path, a pressure sensor and a controller which are arranged on a stand column middle cylinder are connected with the safety valve, and when the stand column is subjected to impact pressure, the working process of the safety valve comprises the following steps:
(1) when the upright column is subjected to impact pressure, the pressure sensor detects an impact pressure signal applied to the upright column and transmits the impact pressure signal to the controller;
(2) the controller analyzes the impact pressure value and compares the impact pressure value with a preset value so as to judge whether the difference value is within a set pressure range;
(3) when the difference value is smaller than the set pressure range, the controller energizes the electromagnetic coil of the pilot valve, the magnetorheological fluid is in a non-Newtonian fluid state and is positioned on the right side of the electromagnetic coil, the pilot valve core does not act at the moment, and the safety valve is in a closed state;
or
When the difference value is larger than the set pressure range, the controller controls the electromagnetic coil to be powered off, at the moment, the magnetorheological fluid is in a Newtonian fluid state and flows to the left side of the electromagnetic coil, the pilot valve core moves leftwards, the safety valve is opened, and the emulsion on the upper part of the valve core returns to an emulsion pump station through a pilot valve core cavity and a control oil flow channel on the valve core; at the moment, the valve core overcomes the pressure of a return spring to move upwards under the pressure action of emulsion at the lower part of the valve core, the valve core is opened, and the emulsion in the upright post flows back to a pump station through a liquid inlet and a drainage port;
(4) when the pressure sensor detects that the pressure of the middle cylinder is reduced below a set pressure range, the controller judges that the relief of the safety valve is finished; then, the controller controls the motor to start, the motor drives the screw rod to rotate, so that the piston is pushed to move rightwards, the piston extrudes the magnetorheological fluid to the right side of the electromagnetic coil, and the pilot valve core is closed; meanwhile, the displacement sensor detects the position change of the motor and transmits a position signal to the controller, and when the motor reaches the rightmost end, the controller controls the motor to be powered off;
(5) then, the controller controls the electromagnetic coil to be electrified to enable the magnetorheological fluid to be changed into a non-Newtonian fluid state, then the controller controls the motor to reversely rotate to return to the initial position, and when the displacement sensor detects that the motor reaches the leftmost end, the controller controls the motor to be powered off to complete resetting of the pilot valve;
(6) and finally, the valve core moves downwards under the action of a reset spring, and the conical body at the bottom end of the valve core plugs the drainage port on the base to complete the reset of the safety valve.
The invention has the beneficial effects that:
1) the safety valve is combined with the pressure sensor and the controller which are arranged on the cylinder in the hydraulic support, the mode that the pressure signal is transmitted by a hydraulic system in the past is changed, the pressure signal is detected and transmitted by the sensor, and the pressure value is analyzed by the controller, so that the action of the pilot valve of the safety valve is controlled to make the pilot valve respond in advance.
2) The safety valve of the invention adopts magnetorheological fluid to control the action of the pilot valve core, replaces the spring control of the traditional safety valve, depends on the extremely short response time of the magnetorheological fluid, shortens the response time of the spring action of the traditional safety valve, and has a quick and efficient working process.
3) The safety valve of the invention cancels the structure of a reset spring in the pilot valve core of the traditional large-flow safety valve, and the motor drives the screw rod to complete reset, thereby reducing the response time of overcoming the spring force in the opening process under the original structure mode.
Drawings
FIG. 1 is a schematic view of the safety valve of the present invention;
FIG. 2 is a schematic structural view of a safety valve housing;
FIG. 3 is a schematic view of a main spool structure;
FIG. 4 is a schematic structural diagram of a pilot valve;
FIG. 5a is a diagram of an initial state of a pilot valve;
FIG. 5b is a schematic structural diagram of the pilot valve during the opening process;
FIG. 5c is a schematic diagram of the pilot valve fully opened;
FIG. 5d is a schematic structural diagram of the pilot valve closing process;
FIG. 5e is a schematic structural diagram of the pilot valve fully closed;
FIG. 5f is a schematic structural diagram of the pilot valve when resetting is completed;
FIG. 6 is a schematic diagram of electrical control of the relief valve;
in the figure: 1-pilot valve end cover, 2-pilot valve cavity, 3-liquid inlet, 4-end cover, 5-plug, 6-control oil flow channel, 7-spring cavity, 8-relief port, 9-spring cavity, 10-control oil flow channel, 11-motor, 12-coupler, 13-lead screw, 14-nut, 15-piston, 16-electromagnetic coil, 17-damping hole, 18-damping hole right cavity, 19-pilot valve core, 20-control oil flow channel, 21-damping hole left cavity, and 22-displacement sensor.
Detailed Description
The present invention will be further described by way of examples, but not limited thereto, with reference to the accompanying drawings.
Example 1:
as shown in fig. 1 to 6, the present embodiment provides a novel hydraulic support safety valve, which includes a valve body, a valve core, a return spring, and a pilot valve; the valve core is arranged in a valve core cavity formed in the valve body, the pilot valve is arranged in a pilot valve cavity formed in the valve body, the reset spring is positioned in the top end of the valve core and a spring cavity formed in the valve body, the pilot valve cavity and the valve core cavity are communicated through two control oil flow channels, magnetorheological fluid is filled in the pilot valve cavity, and emulsion is filled in the valve core cavity.
Specifically, the valve body comprises a shell, a valve seat, an end cover and a plug. The bottom of the shell is connected and installed on the valve seat through threads, two cavities, namely a valve core cavity and a pilot valve cavity 2, are arranged in the shell, the valve core cavity is located in the vertical direction in the shell, the pilot valve cavity 2 is located in the horizontal direction in the shell, the pilot valve cavity 2 and the valve core cavity are communicated through two control oil flow channels, one control oil flow channel is located on the central axis of the valve core cavity, one end of the pilot valve cavity 2 is packaged through an end cover 1, the other end of the pilot valve cavity is packaged through an end cap 5, a liquid inlet 3 is formed in the shell and communicated with the valve core cavity, a flow discharge port 8 is formed in the valve seat and communicated with the valve core cavity.
The valve core is in a cross structure, the spring cavity 9 is formed in the top end of the valve core and used for placing the reset spring, the spring cavity 7 formed in the shell is slightly larger than the size of the top end of the valve core, and when the reset spring is compressed, the top end of the valve core can extend into the spring cavity 7 in the shell, so that the up-and-down movement stability of the valve core is ensured. In this embodiment, the return spring is a disk spring, two through control oil flow passages 10 are arranged in the axial direction of the valve core, one of the control oil flow passages is on the central axis of the valve core and is communicated with the spring cavity 9, the other control oil flow passage is arranged on the cross arm of the valve core and can be connected with the control oil flow passage 6 on the shell to form a passage, the bottom end of the valve core forms a conical body, and when the valve core descends, the conical body can block the opening on the valve seat.
The pilot valve comprises a motor 11, a screw 13, a nut 14, a piston 15, an electromagnetic coil 16 and a pilot valve core 19 which are arranged from left to right in sequence; the motor 11 is in transmission connection with one end of the lead screw 13 through the coupler 12, the nut 14 is in threaded connection with the lead screw 13, the nut 14 is fixed in the pilot valve cavity 2, the magnetorheological fluid is located between the piston 15 and the pilot valve core 19, and the electromagnetic coil 16 is axially provided with the damping hole 17 which can allow the magnetorheological fluid to circulate on the left side and the right side of the electromagnetic coil.
The pilot valve cavity 2 is a stepped cavity and comprises a large cavity and a small cavity, and the two control oil flow passages 6 are respectively communicated with the large cavity and the small cavity; one end of the pilot valve core 19 is a cone, the pilot valve core 19 is arranged in the large cavity, and when the pilot valve core 19 moves, the cone can block the small cavity. A displacement sensor 22 is arranged in a large cavity of the pilot valve cavity 2, and the displacement sensor 22 is positioned on the left side of the motor 11 and used for measuring the movement distance of a motor lead screw so as to control the motor to stop and rotate positively and negatively.
Example 2:
the novel hydraulic support safety valve is structurally as described in embodiment 1, and is different in that: the return spring is a rubber spring.
Example 3:
the novel hydraulic support safety valve is structurally as described in embodiment 1, and is different in that: the return spring is a gas spring.
Example 4:
a novel working method of a safety valve of a hydraulic support is characterized in that the safety valve in embodiment 1 is utilized, the safety valve is installed on a control oil path of a vertical column of the hydraulic support in advance, a pressure sensor and a controller which are arranged on a cylinder in the vertical column are connected with the safety valve, the pressure sensor, a motor 11 and an electromagnetic coil 16 are respectively connected with the controller, and when the vertical column is subjected to impact pressure, the working process of the safety valve comprises the following steps:
(1) when the upright column is subjected to impact pressure, the pressure sensor detects the impact pressure S on the upright column and transmits the impact pressure S to the controller; the controller compares the set value S with the set value0Comparing to obtain a difference value delta S, and comparing the delta S with a set pressure range delta S0Comparing the two, judging whether the impact pressure occurs or not,
(2) when the difference value Delta S is smaller than the set pressure range Delta S0When the electromagnetic coil 16 of the pilot valve is electrified by the controller, the magnetorheological fluid is in a non-Newtonian fluid state and is positioned between the right side of the electromagnetic coil 16 and the pilot valve core 19, the magnetorheological fluid props against the pilot valve core 19, the pilot valve core 19 does not act at the moment, the cone blocks the small cavity, the safety valve is in a closed state, and the emulsion in the valve core cavity cannot circulate;
or
When the difference value delta S is larger than the set pressure range delta S0When the electromagnetic coil 16 is not electrified by the controller, the magnetorheological fluid is in a Newtonian fluid state and flows to the left side of the electromagnetic coil 16 through the damping hole 17 on the electromagnetic coil 16, the pilot valve core 19 is pushed to the left by the emulsified liquid to move, the cone opens the small cavity, the safety valve is opened, and the emulsified liquid on the upper part of the valve core returns to the emulsified liquid pump station through the pilot valve core cavity and the control oil flow channel 10 on the valve core and the drain port 8; at the moment, the valve core overcomes the pressure of a return spring to move upwards under the pressure action of emulsion at the lower part of the valve core, the return spring is compressed, the valve core is opened, and the emulsion in the upright post flows back to a pump station through the liquid inlet 3, the valve core cavity (at the lower part of the valve core) and the drainage port 8;
(3) when the pressure sensor detects that the middle cylinder pressure is reduced to the set pressure range delta S0When the safety valve is closed, the controller judges that the safety valve is closed; then, the controller controls the motor 11 to start, the motor 11 drives the lead screw 13 to rotate, the front end of the lead screw 13 props against the piston 15 to push the piston 15 to move rightwards, the piston 15 extrudes magnetorheological fluid (through a damping hole 17) to the right side of the electromagnetic coil 16 to push the pilot valve core 19 to move rightwards, the cone blocks the small cavity, and the pilot valve core 19 is closed; meanwhile, the displacement sensor 22 detects the position change of the motor 11 and transmits a position signal to the controller (the displacement sensor is connected with the controller), and when the motor 11 reaches the rightmost end, the controller controls the motor 11 to be powered off;
(4) then, the controller controls the electromagnetic coil 16 to be electrified, so that the magnetorheological fluid is changed into a non-Newtonian fluid state, then the controller controls the motor 11 to reversely rotate to return to the initial position, the piston 15 cannot act due to the action of atmospheric pressure, and when the displacement sensor 22 detects that the motor 11 reaches the leftmost end, the controller controls the motor 11 to be powered off, so that the reset of the pilot valve is completed;
(5) and finally, the valve core moves downwards under the action of a return spring, and the conical body at the bottom end of the valve core plugs the drainage port 8 on the base to complete the reset of the safety valve.
The whole working process of the safety valve is shown in fig. 5a to 5f, the flow paths of the magnetorheological fluid and the emulsion can be seen, and the connection relationship among the displacement sensor, the electromagnetic coil, the motor, the pressure sensor and the controller is shown in fig. 6.

Claims (9)

1. A novel hydraulic support safety valve is characterized by comprising a valve body, a valve core, a reset spring and a pilot valve; the valve core is arranged in a valve core cavity formed in the valve body, the pilot valve is arranged in a pilot valve cavity formed in the valve body, the reset spring is positioned at the top end of the valve core and in a spring cavity formed in the valve body, the pilot valve cavity is communicated with the valve core cavity through a first control oil flow channel and a second control oil flow channel, magnetorheological fluid is filled in the pilot valve cavity, and emulsion is filled in the valve core cavity;
the pilot valve comprises a motor, a lead screw, a nut, a piston, an electromagnetic coil and a pilot valve core which are sequentially arranged from left to right; the motor is connected with the transmission of lead screw one end, and nut and lead screw threaded connection, magnetorheological suspensions are located between piston and the pilot valve core, and solenoid is provided with the damping hole axially.
2. The new hydraulic mount safety valve of claim 1 wherein the valve body comprises a housing, a valve seat, an end cap and a plug; the shell is arranged on the valve seat, the liquid inlet is formed in the shell and is communicated with the valve core cavity, the valve core cavity is located in the shell in the vertical direction, the pilot valve cavity is located in the shell in the horizontal direction, one end of the pilot valve cavity is packaged through the pilot valve end cover, the other end of the pilot valve cavity is packaged through the plug, the bottom of the valve seat is packaged through the end cover, and the valve seat is provided with the flow relief port and is communicated with the valve core.
3. The novel hydraulic support safety valve as claimed in claim 1, wherein the valve core is in a cross shape, the spring cavity is opened at the top end of the valve core, and two first control oil flow passages and two second control oil flow passages are axially arranged on the valve core.
4. The new hydraulic support safety valve of claim 2, wherein the bottom end of the valve core is arranged into a cone, and when the valve core descends, the cone can block the discharge port on the valve seat.
5. The new hydraulic support safety valve as claimed in claim 1, wherein a displacement sensor is arranged in the pilot valve cavity, and the displacement sensor is positioned at one side of the motor.
6. The new hydraulic mount safety valve of claim 1, wherein the output shaft of the motor is drivingly connected to one end of the lead screw via a coupling.
7. The novel hydraulic support safety valve as claimed in claim 1, wherein the pilot valve cavity is a stepped cavity and comprises a large cavity and a small cavity, and the first control oil flow passage and the second control oil flow passage are respectively communicated with the large cavity and the small cavity; one end of the pilot valve core is a cone, the pilot valve core is arranged in the large cavity, and when the pilot valve core moves, the cone can block the small cavity.
8. The new hydraulic mount safety valve of claim 1, wherein the return spring comprises a belleville spring, a rubber spring, a gas spring.
9. A method for operating a novel hydraulic prop safety valve according to any one of claims 1 to 8, the safety valve being installed in a hydraulic prop control oil path, the safety valve being connected to a pressure sensor and a controller arranged in a cylinder in the prop, the safety valve operating when the prop is subjected to an impact pressure, comprising the steps of:
(1) when the upright column is subjected to impact pressure, the pressure sensor detects an impact pressure signal applied to the upright column and transmits the impact pressure signal to the controller;
(2) the controller analyzes the impact pressure value and compares the impact pressure value with a preset value so as to judge whether the difference value is within a set pressure range;
(3) when the difference value is smaller than the set pressure range, the controller energizes the electromagnetic coil of the pilot valve, the magnetorheological fluid is in a non-Newtonian fluid state and is positioned on the right side of the electromagnetic coil, the pilot valve core does not act at the moment, and the safety valve is in a closed state;
or
When the difference value is larger than the set pressure range, the controller controls the electromagnetic coil to be powered off, at the moment, the magnetorheological fluid is in a Newtonian fluid state and flows to the left side of the electromagnetic coil, the pilot valve core moves leftwards, the safety valve is opened, and the emulsion on the upper portion of the valve core returns to an emulsion pump station through the pilot valve core cavity and the first control oil flow channel and the second control oil flow channel on the valve core; at the moment, the valve core overcomes the pressure of a return spring to move upwards under the pressure action of emulsion at the lower part of the valve core, the valve core is opened, and the emulsion in the upright post flows back to a pump station through a liquid inlet and a drainage port;
(4) when the pressure sensor detects that the pressure of the middle cylinder is reduced below a set pressure range, the controller judges that the relief of the safety valve is finished; then, the controller controls the motor to start, the motor drives the screw rod to rotate, so that the piston is pushed to move rightwards, the piston extrudes the magnetorheological fluid to the right side of the electromagnetic coil, and the pilot valve core is closed; meanwhile, the displacement sensor detects the position change of the motor and transmits a position signal to the controller, and when the motor reaches the rightmost end, the controller controls the motor to be powered off;
(5) then, the controller controls the electromagnetic coil to be electrified to enable the magnetorheological fluid to be changed into a non-Newtonian fluid state, then the controller controls the motor to reversely rotate to return to the initial position, and when the displacement sensor detects that the motor reaches the leftmost end, the controller controls the motor to be powered off to complete resetting of the pilot valve;
(6) and finally, the valve core moves downwards under the action of a reset spring, and the conical body at the bottom end of the valve core plugs the drainage port on the base to complete the reset of the safety valve.
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US20090178397A1 (en) * 2008-01-16 2009-07-16 Gm Global Technology Operations, Inc. Servo system augmented with an active material component
CN104633233A (en) * 2015-02-11 2015-05-20 华侨大学 Overflow valve with magneto-rheological pilot valve
CN106168306A (en) * 2016-08-11 2016-11-30 张广 A kind of air relief valve based on magnetic rheology effect
CN206496071U (en) * 2017-02-23 2017-09-15 浙江师范大学 A kind of magnetorheological pilot-operated overflow valve
CN206496055U (en) * 2017-02-23 2017-09-15 浙江师范大学 A kind of overflow valve based on magnetic rheology effect

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Publication number Priority date Publication date Assignee Title
US20090178397A1 (en) * 2008-01-16 2009-07-16 Gm Global Technology Operations, Inc. Servo system augmented with an active material component
CN104633233A (en) * 2015-02-11 2015-05-20 华侨大学 Overflow valve with magneto-rheological pilot valve
CN106168306A (en) * 2016-08-11 2016-11-30 张广 A kind of air relief valve based on magnetic rheology effect
CN206496071U (en) * 2017-02-23 2017-09-15 浙江师范大学 A kind of magnetorheological pilot-operated overflow valve
CN206496055U (en) * 2017-02-23 2017-09-15 浙江师范大学 A kind of overflow valve based on magnetic rheology effect

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