CN110081037B - Automatic and rapid voltage stabilizing device with self-checking function for energy accumulator and using method - Google Patents
Automatic and rapid voltage stabilizing device with self-checking function for energy accumulator and using method Download PDFInfo
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- CN110081037B CN110081037B CN201910222224.XA CN201910222224A CN110081037B CN 110081037 B CN110081037 B CN 110081037B CN 201910222224 A CN201910222224 A CN 201910222224A CN 110081037 B CN110081037 B CN 110081037B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
- F15B1/027—Installations or systems with accumulators having accumulator charging devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
- F15B1/04—Accumulators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/024—Pressure relief valves
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- Engineering & Computer Science (AREA)
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- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
Abstract
The invention belongs to the technical field of hydraulic rapid pressure stabilization of an explosion-proof vehicle in a coal mine, and particularly relates to an automatic rapid pressure stabilization device of an energy accumulator with a self-checking function and a using method of the automatic rapid pressure stabilization device. The problem of the quick steady voltage of energy storage ware is solved, including hydraulic tank, relief valve, working pump, system pressure table, quick pressure stabilizer and energy storage ware, one end of working pump connects hydraulic tank, and the other end communicates with quick pressure stabilizer's P mouth, sets up the relief valve between working pump and the hydraulic tank, and quick pressure stabilizer's H mouth connects energy storage ware and braking or a steering system, and quick pressure stabilizer's A mouth connects the operating device multiple unit valve. The invention can effectively meet the use requirement of rapid voltage stabilization of the large-volume energy accumulator. Meanwhile, an automatic detection function is added, the troubleshooting of the quick pressure stabilizing device or the hydraulic system is convenient, and the labor intensity of workers is reduced.
Description
Technical Field
The invention belongs to the technical field of hydraulic rapid pressure stabilization of an explosion-proof vehicle in a coal mine, and particularly relates to an automatic rapid pressure stabilization device of an energy accumulator with a self-checking function and a using method of the automatic rapid pressure stabilization device.
Background
At present, the major coal mining countries in the world have relatively accepted many advantages of a trackless auxiliary transportation mode. The accumulator is an important element in a hydraulic system of the trackless auxiliary transport vehicle, provides a pressure oil source for a braking system or an emergency steering system, and enables the vehicle to realize rapid braking and emergency steering risk avoidance under a fault, thereby ensuring the safety of the vehicle.
Because the energy accumulator is a pressure container, the state lists special equipment, and manufacturers can process and produce the energy accumulator only by manufacturing licenses of the special equipment. The energy accumulator used on the heavy vehicle has large volume and high pressure, the volume is generally 4-12L, and the pressure can reach 15-19 MPa, so that the energy accumulator becomes a dangerous container. The energy accumulator on the coal mine underground heavy vehicle is used for steering or braking, and the volume of the steering oil cylinder or the brake is large and the energy accumulator is frequently used, so that the volume of the corresponding energy accumulator is increased, the rapid voltage stabilization of the energy accumulator is urgently needed to be solved, and the use requirement of a user is met.
Disclosure of Invention
The invention provides an automatic rapid voltage stabilizing device of an energy accumulator with a self-checking function and a using method thereof, aiming at solving the rapid voltage stabilizing problem of the energy accumulator.
The invention adopts the following technical scheme: an automatic quick pressure stabilizing device of an energy accumulator with a self-checking function comprises a hydraulic oil tank, a safety valve, a working pump, a system pressure gauge, a quick pressure stabilizing device and an energy accumulator, wherein the quick pressure stabilizing device comprises a cover plate, a reset spring, a valve core, a micro filter, a valve body, a pressure control valve, a zero-leakage switch valve, a ball valve and a one-way valve, the cover plate is arranged at the upper part of the valve body, the valve core is arranged in the valve body, the space in the valve body is divided into an upper spring cavity and a lower cavity by the valve core, the lower end of the lower cavity is a P port, the reset spring is arranged in the spring cavity between the valve core and the cover plate, the pressure control valve is arranged on the valve body, the pressure control valve is respectively communicated with the spring cavity and a T port arranged on the valve body, an A port is arranged on the valve body, the A port is communicated with the initial position of the valve core in the, oil outside the ball valve can not flow to the lower cavity, and an outlet of the ball valve is an H port; one end of the working pump is connected with a hydraulic oil tank, the other end of the working pump is communicated with a P port of the rapid pressure stabilizing device, a safety valve is arranged between the working pump and the hydraulic oil tank, an H port of the rapid pressure stabilizing device is connected with an energy accumulator and a braking or steering system, and an A port of the rapid pressure stabilizing device is connected with a multi-way valve of a working mechanism.
Furthermore, the valve body is provided with a through hole I communicated with the outside through a cavity A and a through hole II communicated with the outside through a cavity B, a throttling hole I is connected between the through hole I and the through hole II, the through hole I and the through hole II are blocked with the outside, and a micro filter is arranged in the through hole II.
Further, the pressure control valve is communicated with a throttling hole II arranged in the valve body, and the throttling hole II is communicated with the outside through a zero-leakage switch valve.
Furthermore, the valve core adopts a conical structure and forms line seal with a convex shoulder of the valve body.
Further, a system pressure gauge is arranged at the outlet of the working pump; an energy accumulator pressure gauge is arranged on the energy accumulator.
The working principle of the automatic quick pressure stabilizing device of the energy accumulator with the self-checking function is that after the vehicle is started, the S port of the working pump sucks oil from the hydraulic oil tank and discharges high-pressure oil from the P1 port, meanwhile, the P1 port is also connected with the P2 port of the safety valve and the P port of the quick pressure stabilizing device, when the system is overloaded or has a fault, the safety valve is opened, the P2 port is communicated with the T port, and the high-pressure oil returns to the oil tank through the T port;
under the normal condition of a system, high-pressure oil provided by a working pump reaches a port P of a rapid pressure stabilizing device through a port P1, the high-pressure oil directly acts on a valve core, under the spring force of a return spring, and the high-pressure oil at the port P reaches a spring cavity of the valve core through a micro filter and a throttling hole I, the high-pressure oil has downward acting force on the valve core, and because the area of the spring cavity of the valve core is larger than that of a lower cavity, the force of the spring cavity of the valve core is larger than that of the lower cavity at the moment, so that the valve core is in a closed state, the high-pressure oil at the port P of the rapid pressure stabilizing device can only reach a port H through a one-way valve and a ball valve which are normally open, the port H is connected with a port X of an; when the accumulator is replenished with liquid, pressure oil is taken from a flow passage of the accumulator and normally opened through a zero-leakage switch valve, the throttling hole II reaches a control port of a pressure control valve, when the pressure reaches a set value, the pressure control valve is opened, the pressure oil in a spring cavity reaches a T port through the pressure control valve and returns to a hydraulic oil tank, at the moment, the acting force of a return spring of an upper cavity of a valve core is only less than that of the pressure oil at a P port of a lower cavity, the valve core is pushed to move upwards, the valve core is opened, the pressure oil reaches an A port through the flow passage, and a multi-way valve or other oil ways of a working mechanism; when the pressure of the energy accumulator is supplied to a steering or braking system and the pressure is reduced and is lower than a set value, the pressure control valve is automatically closed, so that the high-pressure oil supplied by the working pump is quickly replenished to the energy accumulator through the quick pressure stabilizing device to enable the energy accumulator to reach the set pressure value again.
Compared with the prior art, the invention can effectively meet the use requirement of rapid voltage stabilization of the large-volume energy accumulator. Meanwhile, an automatic detection function is added, the troubleshooting of the quick pressure stabilizing device or the hydraulic system is convenient, and the labor intensity of workers is reduced. The current underground trackless auxiliary transportation of the coal mine has a wide prospect, the demand on underground explosion-proof vehicles is rapidly increased, the domestic demand is about 200-300 vehicles every year, the price of each set of the device is 2 ten thousand yuan, the total value can reach 400-600 ten thousand yuan, each profit is calculated by 0.6 ten thousand yuan, the profit can be generated by 120-180 ten thousand yuan, and the development and application of the device can improve the running safety of the underground vehicles and reduce the occurrence of accidents. Will provide powerful guarantee for the safety production of enterprises.
Drawings
FIG. 1 is a schematic structural diagram of a rapid voltage stabilizer;
FIG. 2 is a schematic view of a rapid pressure stabilizer valve;
FIG. 3 is a diagram of the operation of the fast voltage stabilization system;
in the figure, 1-a hydraulic oil tank, 2-a safety valve, 3-a working pump, 4-a system pressure gauge, 5-a rapid pressure stabilizing device, 6-an energy accumulator, 7-an energy accumulator pressure gauge, 5.1-a cover plate, 5.2-a return spring, 5.3-an orifice I, 5.4-a valve core, 5.5-a micro filter, 5.6-a valve body, 5.7-a pressure control valve, 5.8-an orifice II, 5.9-a zero-leakage switch valve, 5.10-a ball valve and 5.11-a one-way valve.
Detailed Description
The utility model provides a colliery is explosion-proof vehicle hydraulic pressure fast stabilization pressure device in pit, including the oil tank that connects gradually, the working pump, quick pressure regulator, relief valve and energy storage ware, 3 termination hydraulic tank 1 of working pump, the other end communicates with quick pressure regulator 5's P mouth, set up relief valve 2 between working pump 3 and the hydraulic tank 1, quick pressure regulator 5's H mouth connects energy storage ware 6 and braking or a steering system, quick pressure regulator 5's A mouth connects the operating device multiple unit valve. The quick pressure stabilizing device is also communicated with the multi-way valve of the working mechanism and the oil tank, and the outlet of the energy accumulator is connected with a pressure gauge on an instrument panel. As shown in fig. 1.
When the vehicle starts, the working pump absorbs oil from the oil tank, the pumped hydraulic oil is automatically judged by the quick pressure stabilizing device, the accumulator is replenished with liquid and is boosted under the condition of insufficient pressure of the accumulator, and when the pressure reaches a rated value, the quick pressure stabilizing device is automatically communicated with a multi-way valve of a working mechanism and the like, so that an oil source is provided for other working mechanisms on the vehicle. When the system is abnormal, the high-pressure oil provided by the pump leaks back to the oil tank through the safety valve, thereby protecting each valve and various working mechanisms in the system.
Fig. 2 is a schematic view of a valve of a rapid pressure stabilizer, the rapid pressure stabilizer 5 includes a cover plate 5.1, a return spring 5.2, a valve core 5.4, a microfilter 5.5, a valve body 5.6, a pressure control valve 5.7, a zero leakage switch valve 5.9, a ball valve 5.10 and a check valve 5.11, the cover plate 5.1 is arranged on the upper portion of the valve body 5.6, the valve core 5.4 is arranged in the valve body 5.6, the valve core 5.4 divides the space in the valve body 5.6 into a spring cavity on the upper side and a lower cavity on the lower side, the lower end of the lower cavity is a P port, the return spring 5.2 is arranged in the spring cavity between the valve core 5.4 and the cover plate 5.1, the pressure control valve 5.7 is arranged on the valve body 5.6, the pressure control valve 5.7 is respectively communicated with the spring cavity and a T port arranged on the valve body 5.6, an a port is arranged on the valve body 5.6, the a port is communicated with the initial position of the valve core 5.4 in the valve body 5.6, the check valve body 5.6 is arranged on the, the outlet of the ball valve 5.10 is an H port.
The valve body 5.6 is provided with a through hole I communicated with the outside through a cavity A and a through hole II communicated with the outside through a cavity B, a throttling hole I5.3 is connected between the through hole I and the through hole II, the through hole I and the through hole II are plugged with the outside, and a micro filter 5.5 is arranged in the through hole II. The pressure control valve 5.7 is communicated with an orifice II5.8 arranged in the valve body 5.6, and the orifice II5.8 is communicated with the outside through a zero leakage switch valve 5.9.
According to the actual working condition of an underground explosion-proof vehicle of a coal mine, the pressure of an energy accumulator is continuously changed due to frequent braking or steering in the running process, and the conventional product cannot meet the requirement of quickly stabilizing the pressure due to small flow. The quick pressure stabilizing device realizes quick and stable pressure of the energy accumulator by increasing the drift diameter of the valve core 5.4, and meets the actual use requirement. The valve core 5.4 adopts a conical structure and forms line sealing with a convex shoulder of the valve body 5.6, thereby ensuring the sealing reliability.
After the vehicle is started, the S port of the working pump 3 sucks oil from the hydraulic oil tank 1, and high-pressure oil is discharged from the P1 port, and meanwhile, the P1 port is connected with the P2 port of the safety valve 2 and the P port of the rapid pressure stabilizer 5. When the system is overloaded or fails, the safety valve 2 is opened, the port P2 is communicated with the port T, and high-pressure oil returns to the oil tank through the port T, so that various valves and various working mechanisms in the system are protected.
Under normal system conditions, high-pressure oil provided by the working pump 3 reaches a port P of the rapid pressure stabilizing device 5 through a port P1, the high-pressure oil directly acts on the valve core 5.4, but under the spring force of the return spring 5.2, the high-pressure oil at the port P reaches a spring cavity of the valve core 5.4 through the micro filter 5.5 and the throttling hole I5.3, and the high-pressure oil has downward acting force on the valve core 5.4. Since the area of the upper chamber (spring chamber) of the valve element 5.4 is larger than that of the lower chamber, it can be known from the formula F = PS that the force of the upper chamber of the valve element 5.4 is larger than that of the lower chamber, so that the valve element 5.4 is in a closed state. The high-pressure oil at the P port of the rapid pressure stabilizing device 5 can only reach the H port through the one-way valve 5.11 and the ball valve 5.10 which are normally opened, the H port is connected with the X port of the energy accumulator 6, and the high-pressure oil provided by the working pump 3 replenishes the energy accumulator 6 to enable the energy accumulator 6 to reach the set pressure.
When the accumulator 6 is replenished with liquid, pressure oil is taken from a flow passage of the accumulator and normally opened through the zero-leakage switch valve 5.9, the throttling hole II5.8 reaches a control port of the pressure control valve 5.7, when the pressure reaches a set value, the pressure control valve 5.7 is opened, the pressure oil in the spring cavity reaches a T port and returns to the hydraulic oil tank 1 through the pressure control valve 5.7, at the moment, the acting force of the return spring 5.2 left in the upper cavity of the valve core 5.4 is smaller than that of the pressure oil at a P port of the lower cavity, the valve core 5.4 is pushed to move upwards, the valve core is opened, the pressure oil reaches an A port through the flow passage, and a multi-way valve or other oil ways of a working mechanism work. When the pressure of the energy accumulator 6 is supplied to the steering or braking, the pressure is reduced and is lower than the set value, the pressure control valve 5.7 is automatically closed, so that the high-pressure oil supplied by the working pump 3 can quickly supplement the liquid for the energy accumulator 6 through the quick pressure stabilizing device to enable the energy accumulator 6 to reach the set pressure value again.
In order to improve the service life and reliability of the rapid pressure stabilizing device, the throttling hole I5.3 and the throttling hole II5.8 are additionally arranged during the design of the device, so that the impact of the valve core during movement is reduced, and the service life of elements is prolonged. Because the oil of orifice I5.3 often flows back to hydraulic tank, under the poor condition of fluid cleanliness, orifice I5.3 extremely easily takes place to block up, leads to quick voltage regulator device can not normally work. To avoid this, a microfilter 5.5 is added to the flow path of the orifice I5.3 to reduce the number of failures caused by the blockage of the orifice I5.3.
The self-checking function of the rapid voltage stabilizing device is as follows: if the pressure of the accumulator 6 can not reach the set value, even the pressure is zero, the pressure value can be observed at any time through the accumulator pressure gauge 7. The ball valve 5.10 needs to be closed, if the pressure gauge 7 of the energy accumulator can reach a set value, the leakage is shown in the oil way of the energy accumulator 6, the braking system or the steering system, the oil way needs to be checked, and the rapid pressure stabilizing device works normally. After the ball valve 5.10 is closed, the pressure still can not reach the set value, the zero leakage switch valve 5.9 needs to be closed, if the pressure reaches the set value at the moment, the pressure control valve 5.7 is damaged or blocked, and the valve needs to be replaced. In the troubleshooting process, the pipeline on the quick pressure stabilizing device does not need to be disassembled and assembled, so that the possibility of danger caused by the operation of workers under pressure is avoided.
The working range of the rapid pressure stabilizing device is wide, and the working pressure of the rapid pressure stabilizing device is determined by adjusting the set pressure of the pressure control valve 5.7.
Claims (4)
1. The utility model provides a have automatic quick voltage regulator device of energy storage ware of self-checking function concurrently which characterized in that: comprises a hydraulic oil tank (1), a safety valve (2), a working pump (3), a system pressure gauge (4), a rapid pressure stabilizing device (5) and an energy accumulator (6), wherein the rapid pressure stabilizing device (5) comprises a cover plate (5.1), a reset spring (5.2), a valve core (5.4), a micro filter (5.5), a valve body (5.6), a pressure control valve (5.7), a zero-leakage switch valve (5.9), a ball valve (5.10) and a one-way valve (5.11), the cover plate (5.1) is arranged at the upper part of the valve body (5.6), the valve core (5.4) is arranged in the valve body (5.6), the valve core (5.4) divides the space in the valve body (5.6) into a spring cavity at the upper side and a lower cavity at the lower side, the lower end of the lower cavity is a P port, the reset spring (5.2) is arranged in the spring cavity between the valve core (5.4) and the cover plate (5.1), the valve body (5.6) is provided with the pressure control valve (5.7), the pressure control valve body (5., the valve body (5.6) is provided with an opening A, the opening A is communicated with the initial position of the valve core (5.4) in the valve body (5.6), the valve body (5.6) is provided with a one-way valve (5.11), the inner side of the one-way valve (5.11) is communicated with the lower cavity, the outer side of the one-way valve (5.11) is provided with a ball valve (5.10), and the outlet of the ball valve (5.10) is an opening H; one end of the working pump (3) is connected with the hydraulic oil tank (1), the other end of the working pump is communicated with a P port of the rapid pressure stabilizing device (5), a safety valve (2) is arranged between the working pump (3) and the hydraulic oil tank (1), an H port of the rapid pressure stabilizing device (5) is connected with the energy accumulator (6) and the braking or steering system, and an A port of the rapid pressure stabilizing device (5) is connected with the multi-way valve of the working mechanism;
a through hole I with a spring cavity communicated with the outside and a through hole II with a lower cavity communicated with the outside are formed in the valve body (5.6), a throttling hole I (5.3) is connected between the through hole I and the through hole II, the through hole I and the through hole II are blocked with the outside, and a micro filter (5.5) is arranged in the through hole II;
the pressure control valve (5.7) is communicated with an orifice II (5.8) arranged in the valve body (5.6), and the orifice II (5.8) is communicated with the outside through a zero-leakage switch valve (5.9).
2. The automatic rapid pressure stabilizing device with self-checking function for energy accumulator as claimed in claim 1, wherein: the valve core (5.4) adopts a conical structure and forms line seal with a convex shoulder of the valve body (5.6).
3. The automatic rapid pressure stabilizing device with self-checking function for energy accumulator as claimed in claim 2, wherein: a system pressure gauge (4) is arranged at the outlet of the working pump (3); an energy accumulator pressure gauge (7) is arranged on the energy accumulator (6).
4. The use method of the automatic rapid voltage stabilization device with self-checking function for the energy accumulator according to claim 3, is characterized in that: after the vehicle is started, the S port of the working pump (3) sucks oil from the hydraulic oil tank (1), high-pressure oil is discharged from the P1 port, and meanwhile, the P1 port is also connected with the P2 port of the safety valve (2) and the P port of the rapid pressure stabilizing device (5);
when the system is overloaded or fails, the safety valve (2) is opened, the port P2 is communicated with the port T, and high-pressure oil returns to the oil tank through the port T;
under the normal condition of the system, high-pressure oil provided by the working pump (3) reaches a port P of the rapid pressure stabilizing device (5) through a port P1, the high-pressure oil directly acts on the valve core (5.4), under the spring force of the return spring (5.2), and the high-pressure oil at the port P reaches a spring cavity of the valve core (5.4) through the micro filter (5.5) and the throttling hole I (5.3), the high-pressure oil has downward acting force on the valve core (5.4), because the area of the spring cavity of the valve core (5.4) is larger than that of the lower cavity, the force of the spring cavity of the valve core (5.4) is larger than that of the lower cavity at the moment, so that the valve core (5.4) is in a closed state, high-pressure oil at a port P of the rapid pressure stabilizing device (5) can only reach a port H through a one-way valve (5.11) and a ball valve (5.10) in a normally open state, the port H is connected with a port X of the energy accumulator (6), and high-pressure oil provided by the working pump (3) replenishes the energy accumulator (6) to enable the energy accumulator to reach a set pressure; when the accumulator (6) is replenished with liquid, pressure oil is taken from a flow channel of the accumulator and normally opened through a zero-leakage switch valve (5.9), a throttling hole II (5.8) reaches a control port of a pressure control valve (5.7), when the pressure reaches a set value, the pressure control valve (5.7) is opened, the pressure oil in a spring cavity reaches a T port back to a hydraulic oil tank (1) through the pressure control valve (5.7), at the moment, the acting force of only a return spring (5.2) left in an upper cavity of a valve core (5.4) is smaller than that of pressure oil at a P port of a lower cavity, the valve core (5.4) is pushed to move upwards, the valve core is opened, the pressure oil reaches an A port through the flow channel, and then a multi-way valve or other oil ways of a working mechanism work; when the pressure of the energy accumulator (6) is supplied to a steering or braking system and the pressure is reduced and is lower than a set value, the pressure control valve (5.7) can be automatically closed, so that the high-pressure oil supplied by the working pump (3) can rapidly replenish liquid for the energy accumulator (6) through the rapid pressure stabilizing device to enable the energy accumulator to reach the set pressure value again.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910222224.XA CN110081037B (en) | 2019-03-22 | 2019-03-22 | Automatic and rapid voltage stabilizing device with self-checking function for energy accumulator and using method |
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| CN201910222224.XA CN110081037B (en) | 2019-03-22 | 2019-03-22 | Automatic and rapid voltage stabilizing device with self-checking function for energy accumulator and using method |
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| CN110081037B true CN110081037B (en) | 2020-06-05 |
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| CN101367347B (en) * | 2008-10-03 | 2011-07-20 | 内蒙古北方重型汽车股份有限公司 | Lifting and steering control method and system of self-discharging vehicle for rigid mining |
| CN102493950B (en) * | 2011-12-01 | 2016-03-30 | 无锡煤矿机械股份有限公司 | A kind of control pressurer system of emulsion pump No Load Start and method |
| CN203548652U (en) * | 2013-09-26 | 2014-04-16 | 上海安运输送设备有限公司 | Disc type controllable brake device for coal mine |
| CN203978961U (en) * | 2014-07-07 | 2014-12-03 | 广东科达洁能股份有限公司 | The energy-storing pressure-stabilizing device that a kind of precision is controlled automatically |
| CN104595256B (en) * | 2014-12-31 | 2017-01-25 | 中国煤炭科工集团太原研究院有限公司 | Novel energy accumulator automatic unloading device of coal mine underground explosion-proof vehicle |
| CN204641733U (en) * | 2015-04-09 | 2015-09-16 | 连云港天明装备有限公司 | A kind of underground coal mine shovel car gas control accumulator valve group |
| CN107676339B (en) * | 2017-11-03 | 2019-07-26 | 北京天地玛珂电液控制系统有限公司 | A kind of high-pressure hydraulic pump test hydraulic system and test method |
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