CN211648200U - Contractible mine pressure indicating device - Google Patents

Abstract

The utility model provides a yieldable mine pressure indicating device, including piston cylinder, piston rod and first manometer, be equipped with on the outer wall of piston cylinder and be used for adjusting the vertical adjustment mechanism of the vertical removal of piston cylinder, the bottom of piston cylinder is equipped with T type connecting pipe, the perpendicular pipe of T type connecting pipe with the piston cylinder intercommunication, one side of the horizontal pipe of T type connecting pipe is equipped with the inlet, and the opposite side is equipped with the liquid outlet, the inlet with all be equipped with the control valve on the liquid outlet, one side of liquid outlet is connected with the surge tank body through the drain pipe, the top of the surge tank body is equipped with the gas vent, the gas vent has connected gradually first manometer and relief valve through the pipeline. The device solves the problems that the height of the existing device can not be adjusted and certain safety limitation exists through an adjusting structure which is convenient for adjusting the height; through the use of the buffer tank body and the pressure gauge, the measurement data of the mine pressure can be accurately and sensitively obtained, and danger is prevented.

Description

Contractible mine pressure indicating device

Technical Field

The utility model relates to a colliery is equipment field in the pit, concretely relates to yieldability mine pressure indicating device.

Background

Mine pressure is generated primarily as a result of forces developed in the rock mass or support around the roadway and face below the mine due to the effects of mining activities. Under the action of mine pressure, a series of mechanical phenomena can be generated, such as top plate sinking, bottom plate bulging and the like. The changes in these phenomena will directly affect the safety of workers and equipment under the mine.

In the coal and rock mass mining work, the roof is always subjected to pressure intensity change, if the support measures of the roof cannot effectively resist the roof pressure, serious roof accidents can be caused, the occurrence of the coal mine roof accidents not only can cause great economic loss, but also can threaten the life safety of miners, and the safety production work of coal mines is seriously influenced. Therefore, in the mine excavation process, the pressure indicating device is required to be used for observing and detecting the pressure and the bearing capacity of the rock stratum in the mine in time in the roadway so as to improve the safety of coal mine excavation.

Although some pressure indicating devices exist at present, the device cannot adjust the height, and has certain installation limitation. In addition, the existing pressure indicating device usually connects the pressure gauge directly with the piston cylinder, and under the condition that liquid exists in the piston cylinder, the reading of the pressure of the dial plate can be influenced, which brings great uncertainty to the safety mining of coal mines.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems, the utility model aims to provide a retractable mine pressure indicating device, which solves the problems that the height of the existing device can not be adjusted and certain safety limitation exists through an adjusting structure which is convenient for adjusting the height; and a buffer tank body is additionally arranged between the pressure gauge and the piston cylinder, so that liquid in the piston cylinder can enter the buffer tank body along with the compression of the piston, and uncertain factors brought to the safety mining of a coal mine in the prior art are solved.

In order to achieve the above object, the technical solution of the present invention is as follows.

The utility model provides a yieldable mine pressure indicating device, includes piston cylinder, piston rod and first manometer, be equipped with on the outer wall of piston cylinder and be used for adjusting the vertical adjustment mechanism of vertical removal of piston cylinder, the bottom of piston cylinder is equipped with T type connecting pipe, the perpendicular pipe of T type connecting pipe with the piston cylinder intercommunication, one side of the level pipe of T type connecting pipe is equipped with the inlet, and the opposite side is equipped with the liquid outlet, the inlet with all be equipped with the control valve on the liquid outlet, one side of liquid outlet is connected with the surge tank body through the drain pipe, the top of the surge tank body is equipped with the gas vent, the gas vent has connected gradually first manometer and relief valve through the pipeline.

Further, the one end of drain pipe with liquid outlet fixed connection, the other end extends to the buffer tank is internal, and is close to the bottom of the buffer tank body.

Furthermore, a floating plate and a vertical rod for mounting the floating plate are arranged inside the buffer tank body, a mounting hole is formed in the floating plate, and one end of the vertical rod penetrates through the mounting hole and is fixedly connected with the buffer tank body; be equipped with siren trigger switch on the inside wall of the buffer tank body, upper portion one side of kickboard is equipped with siren trigger, siren trigger install in siren trigger switch's downside, the outside of the buffer tank body is equipped with the siren, the siren respectively with siren trigger switch, siren trigger are connected.

Furthermore, the alarm device also comprises a power supply which is respectively connected with the alarm device, the alarm device trigger switch and the alarm device trigger.

Further, a liquid outlet is formed in one side of the bottom of the buffer tank body, the liquid outlet is connected with a liquid storage pool through a pipeline, a water pump is arranged on one side of the liquid storage pool, and the water pump is connected with the liquid storage pool and a liquid inlet of the T-shaped connecting pipe through pipelines respectively.

Further, the vertical adjusting mechanism comprises a fixed ring sleeve sleeved on the outer wall of the piston cylinder and a plurality of telescopic fixing mechanisms uniformly arranged on the outer side of the fixed ring sleeve; the outer side wall of the piston cylinder is provided with a limiting groove, and the fixed ring sleeve is installed in the limiting groove.

Furthermore, the telescopic fixing mechanism comprises a transverse fixing rod and a vertical jack, one end of the transverse fixing rod is fixedly connected with the fixing ring sleeve, and the other end of the transverse fixing rod is fixedly connected with a movable plunger of the vertical jack.

Furthermore, vertical limiting slide rails are arranged on two sides of the vertical jack, the transverse fixing rods are close to each vertical limiting slide rail, a convex block is arranged on one side of each vertical limiting slide rail, the convex blocks are installed in the corresponding vertical limiting slide rails, and the vertical limiting slide rails can be moved along the convex blocks.

Further, the top of piston rod has connected gradually back timber and roof, the roof pass through the articulated elements with the connection can be dismantled to the back timber, the top of piston rod passes the back timber, and with back timber fixed connection.

Furthermore, a closed cylinder barrel is arranged on the lower side of the piston cylinder, a base is arranged at the bottom of the closed cylinder barrel, a plurality of support legs are uniformly arranged on the periphery of the bottom of the base, a bottom plate is arranged on the lower side of the base, the base and the support legs positioned on the periphery of the base are jointly enclosed to form a groove cavity for accommodating the bottom plate, and a plurality of anti-skidding convex edges are arranged on one side, away from the base, of the bottom plate; a piston is arranged in the sealed cylinder barrel, a pull rod is arranged on the lower side of the piston, and one end of the pull rod sequentially penetrates through the sealed cylinder barrel and the base and is fixedly connected with the bottom plate; and one side of the vent hole is sequentially connected with a second pressure gauge and a second safety valve through a pipeline.

The utility model has the advantages that:

compared with the prior art, the utility model provides a yieldable mine pressure indicating device has following beneficial effect:

1. the vertical adjusting mechanism is used for adjusting the vertical movement of the piston cylinder, so that the piston cylinder can be moved to a required position, and the installation convenience is improved; the device is convenient to operate, easy to install and accurate in measurement.

2. The utility model discloses a use of piston cylinder, piston rod, buffer tank body and manometer, the measured data that obtains mine pressure that can be accurate sensitive, the prevention is dangerous to be taken place.

One end of the piston rod is positioned in the piston cylinder and is in movable connection with the inner wall of the piston cylinder in a sealing manner through a sealing ring, and the other end of the piston rod is connected with the top wall of the mine roadway; liquid (water) is supplemented into the piston cylinder through the liquid inlet and an external acting force is matched, so that the piston rod can be jacked up until the piston rod reaches the top wall, the control valve of the liquid inlet is closed, and the control valve of the liquid outlet is opened;

when the roof in mine tunnel produced decurrent pressure to the piston rod, the piston rod that is located the piston cylinder can produce decurrent effort to liquid (water) in the jar, and then promotes liquid and remove towards one side of the buffer tank body, and the internal air of buffer tank will receive the extrusion, makes the pointer of first manometer deflect, makes things convenient for the reading.

Drawings

Fig. 1 is a schematic structural diagram of embodiment 1 of the present invention.

Fig. 2 is a schematic structural diagram of a piston cylinder and a vertical adjusting mechanism in embodiment 1 of the present invention.

Fig. 3 is a schematic structural diagram of a vertical adjusting mechanism in embodiment 1 of the present invention.

Fig. 4 is a schematic structural diagram of a buffer tank in embodiment 2 of the present invention.

Fig. 5 is a block diagram of the alarm, the alarm trigger switch, the alarm trigger and the power supply according to embodiment 2 of the present invention.

Fig. 6 is a schematic structural diagram of a piston cylinder, a buffer tank body and a liquid storage tank in embodiment 2 of the present invention.

Fig. 7 is a schematic structural view of embodiment 3 of the present invention.

In the figure: 1. a piston cylinder; 101. a limiting groove; 2. a piston rod; 3. a vertical adjustment mechanism; 31. fixing the loop; 32. a telescopic fixing mechanism; 321. a transverse fixing rod; 322. a vertical jack; 323. a vertical limiting slide rail; 324. a bump; 4. a T-shaped connecting pipe; 401. a liquid inlet; 402. a liquid outlet; 403. a control valve; 404. a liquid outlet pipe; 5. a buffer tank body; 501. an exhaust port; 502. a floating plate; 503. erecting a rod; 504. an alarm trigger switch; 505. an alarm trigger; 506. an alarm; 507. a liquid discharge port; 6. a first pressure gauge; 7. a safety valve; 8. a power source; 9. a liquid storage tank; 10. a water pump; 11. a top beam; 12. a top plate; 13. an articulation member; 14. closing the cylinder barrel; 141. a vent hole; 15. a base; 151. a support leg; 16. a base plate; 161. anti-slip ribs; 17. a piston; 18. a pull rod; 19. a second pressure gauge; 20. a second relief valve.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, "a number" or "a number" means at least two, such as two, three, etc., unless specifically limited otherwise.

In addition, the technical solutions between the embodiments of the present invention can be combined with each other, but it is necessary to be able to be realized by a person having ordinary skill in the art as a basis, and when the technical solutions are contradictory or cannot be realized, the combination of such technical solutions should be considered to be absent, and is not within the protection scope of the present invention.

Example 1

Referring to fig. 1-3, the embodiment of the utility model provides a yieldable mine pressure indicating device, including piston cylinder 1, piston rod 2 and first manometer 6, the lower extreme of piston rod is located the piston cylinder, and through sealed swing joint between the inner wall of sealing washer and piston cylinder, also promptly the piston rod can be along the piston cylinder reciprocating motion. The top of piston rod 2 has connected gradually back timber 11 and roof 12, and roof fixed mounting is on the roof in mine tunnel, and roof 12 passes through articulated elements 13 can dismantle with back timber 11 to be connected, makes things convenient for the dismantlement and the installation of back timber, and can make the back timber take place slight swing to adapt to coal mining's needs. The top end of the piston rod 2 passes through the top beam 11 and is fixedly connected with the top beam 11. Thus, the piston rod is also subjected to 3 forces: the gravity of the piston rod, the pulling force of the top beam and the upward floating force of the liquid in the piston cylinder on the piston rod are downward, and a balance state is achieved. Wherein, the liquid in the piston cylinder is water.

The bottom of piston cylinder 1 is equipped with T type connecting pipe 4, the perpendicular pipe and the piston cylinder 1 intercommunication of T type connecting pipe 4, one side of the horizontal pipe of T type connecting pipe 4 is equipped with inlet 401, the opposite side is equipped with liquid outlet 402, all be equipped with control valve 403 on inlet 401 and the liquid outlet 402, make up water in to the piston cylinder through the inlet, and cooperate outside effort, can be with the piston rod jack-up until reaching on the roof, and fixed with the back timber, at this moment, close the control valve of inlet, open the control valve of liquid outlet. The control valve can be an electromagnetic valve or a manual valve and is used for controlling the on-off state of the liquid inlet and the liquid outlet.

One side of liquid outlet 402 is connected with the buffer tank body 5 through drain pipe 404, and the top of the buffer tank body 5 is equipped with gas vent 501, and gas vent 501 has connected gradually first manometer 6 and relief valve 7 through the pipeline. So, when the roof in mine tunnel produced decurrent pressure to the piston rod, the piston rod that is located the piston cylinder will produce decurrent effort to the water in the piston cylinder, and then promote the water in the piston cylinder and remove towards one side of the buffer tank body, and the buffer tank body is airtight jar body, the air in it receives the extrusion because the increase of water volume, make the pointer of first manometer take place to deflect, the measured data that obtains mine pressure that just so can accurate lead, predict the risk according to the change of data, be used for preventing dangerous emergence, the security of digging in the improvement colliery.

One end of the liquid outlet pipe 404 is fixedly connected with the liquid outlet 402, and the other end extends into the buffer tank 5 and is close to the bottom of the buffer tank 5; the water in the piston cylinder can gradually flow to the bottom of the buffer tank body.

In order to improve the convenience of installation, be equipped with the vertical adjustment mechanism 3 that is used for adjusting 1 vertical removal of piston cylinder on the outer wall of piston cylinder 1, conveniently remove the piston cylinder to required position on, and convenient operation, easily installation.

Specifically, the vertical adjusting mechanism 3 comprises a fixed ring sleeve 31 sleeved on the outer wall of the piston cylinder 1 and a plurality of telescopic fixing mechanisms 32 uniformly arranged on the outer side of the fixed ring sleeve 31; be equipped with spacing recess 101 on the lateral wall of piston cylinder 1, fixed ring cover 31 is installed in spacing recess 101, conveniently drives the piston cylinder and reciprocates, improves the stability of installation.

The telescopic fixing mechanism 32 comprises a transverse fixing rod 321 and a vertical jack 322, one end of the transverse fixing rod 321 is fixedly connected with the fixing ring sleeve 31, and the other end of the transverse fixing rod 321 is fixedly connected with a movable plunger of the vertical jack 322. Here, vertical jack 322 is including pressing the controller, movable plunger 325, pneumatic cylinder 326, hydraulic pump 327 and hydraulic tank 328, the hydraulic cylinder cover connects in the lower tip of movable plunger, the hydraulic pump passes through hydraulic pressure oil pipe respectively with the hydraulic tank, the pneumatic cylinder intercommunication, press the controller and be connected with the hydraulic pump electricity, after the circular telegram, start the hydraulic pump through pressing the controller, make the liquid in the hydraulic tank lead-in to the pneumatic cylinder in through hydraulic pressure oil pipe, and then promote movable plunger and take place vertical displacement, with this vertical displacement who promotes horizontal dead lever, thereby drive the piston cylinder and take place vertical displacement.

In order to improve the moving stability of the transverse fixing rod, vertical limiting slide rails 323 are arranged on two sides of the vertical jack 322, a protruding block 324 is arranged on one side of the transverse fixing rod 321 close to each vertical limiting slide rail 323, and the protruding block 324 is installed in the corresponding vertical limiting slide rail 323 and can move along the vertical limiting slide rail 323. Here, the lug of horizontal dead lever both sides is installed in the mounting groove in vertical spacing slide rail, and the joint in the mounting groove to improve its stability that removes, the lug all is equipped with the gyro wheel near the both sides of vertical spacing slide rail, in order to reduce the frictional force of slip in-process.

Example 2

Referring to fig. 4-6, the difference from the above embodiment is that a floating plate 502 and a vertical rod 503 for installing the floating plate 502 are arranged inside the buffer tank body 5, a mounting hole is arranged on the floating plate 502, and one end of the vertical rod 503 passes through the mounting hole and is fixedly connected with the buffer tank body 5, so that the floating plate can float up along the vertical rod along with the buoyancy of the water in the buffer tank body.

An alarm trigger switch 504 is arranged on the inner side wall of the buffer tank body 5, and waterproof treatment is carried out on the alarm trigger switch; an alarm trigger 505 is arranged on one side of the upper part of the floating plate 502, and waterproof treatment is carried out on the alarm trigger; the alarm trigger 505 is attached to the lower side of the alarm trigger switch 504, the alarm 506 is provided on the outer side of the buffer tank 5, and the alarm 506 is connected to the alarm trigger switch 504 and the alarm trigger 505, respectively. The alarm device further comprises a power supply 8, and the power supply 8 is respectively connected with the alarm 506, the alarm trigger switch 504 and the alarm trigger 505 and is used for providing power for the circuit communication.

Along with the improvement of the water level in the buffer tank body, the alarm trigger moves upwards along with the floating plate and gradually approaches to the alarm trigger switch, when the alarm trigger is in contact with the alarm trigger switch, the alarm circuit is switched on, the alarm is triggered to sound, and a safety warning effect is provided for miners in the mine. And the improvement of the internal water level of jar has explained the roof pressure of mine tunnel too big, has the safety influence, reminds through the alarm of this device, prevents the emergence of dangerous condition, has improved the security of colliery excavation work.

In order to realize water circulation operation, one side of the bottom of the buffer tank body 5 is provided with a liquid outlet 507, the liquid outlet is provided with a control valve, the liquid outlet 507 is connected with a liquid storage tank 9 through a pipeline, one side of the liquid storage tank 9 is provided with a water pump 10, and the water pump 10 is respectively connected with the liquid storage tank 9 and a liquid inlet 401 of a T-shaped connecting pipe 4 through pipelines. Because the position of liquid storage tank is less than the surge tank body, open the control valve, can make the internal water of surge tank flow into in the liquid storage tank automatically. And opening a control valve of a liquid inlet on the T-shaped connecting pipe, starting the water pump, and leading water in the liquid storage tank into the piston cylinder under the action of the water pump. Through this structure, realize the water circulation flow, the water economy resource.

Example 3

Referring to fig. 7, the difference from the above embodiment is that a closed cylinder 14 is arranged at the lower side of the piston cylinder 1 and is fixedly connected with the closed cylinder; the bottom of airtight cylinder 14 is equipped with base 15, base and airtight cylinder fixed connection, a plurality of stabilizer blade 151 has evenly set firmly in the bottom week side of base 15, the downside of base 15 is equipped with bottom plate 16, base 15 and a plurality of stabilizer blade 151 that is located 15 week sides of base enclose jointly and close the recess cavity that forms and hold bottom plate 16, the bottom plate is installed in the downside of this recess cavity, and install on the diapire in mine tunnel, one side that base 15 was kept away from to bottom plate 16 is equipped with a plurality of anti-skidding bead 161, the installation stability for strengthening the bottom plate.

A piston 17 is arranged in the sealed cylinder barrel 14, the piston is connected with the inner wall of the sealed cylinder barrel through a sealing ring and is in sealing movable connection with the sealed cylinder barrel, a pull rod 18 is fixedly arranged on the lower side of the piston 17, and one end of the pull rod 18 sequentially penetrates through the sealed cylinder barrel 14 and the base 15 and is fixedly connected with the bottom plate 16; a vent hole 141 is formed at one side of the top of the sealed cylinder 14, and a second pressure gauge 19 and a second safety valve 20 are sequentially connected to one side of the vent hole 141 through a pipe.

During the coal mine excavation process, the impact of the pressure of the top wall and the impact of the pressure of the bottom wall can be influenced. When the bottom plate receives the effort that comes from the diapire, the pull rod that links to each other with the bottom can promote the sealing washer upwards to move in sealed cylinder, and then produces the extrusion to the air in the sealed cylinder, makes the pointer deflection of second manometer, makes things convenient for the reading. Through the pressure indicating function of the device, when the mine pressure is frequently displayed, effective supporting measures can be taken in time, roof accidents are prevented, and safety production is guaranteed. And the device has certain supporting effect on the top wall and the bottom wall, and can strengthen the stability of the top wall.

The above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. A contractible mine pressure indicating device comprises a piston cylinder (1), a piston rod (2) and a first pressure gauge (6), it is characterized in that the outer wall of the piston cylinder (1) is provided with a vertical adjusting mechanism (3) for adjusting the vertical movement of the piston cylinder (1), the bottom of the piston cylinder (1) is provided with a T-shaped connecting pipe (4), a vertical pipe of the T-shaped connecting pipe (4) is communicated with the piston cylinder (1), a liquid inlet (401) is arranged on one side of the horizontal pipe of the T-shaped connecting pipe (4), a liquid outlet (402) is arranged on the other side, control valves (403) are arranged on the liquid inlet (401) and the liquid outlet (402), one side of the liquid outlet (402) is connected with a buffer tank body (5) through a liquid outlet pipe (404), the top of the buffer tank body (5) is provided with an exhaust port (501), and the exhaust port (501) is sequentially connected with a first pressure gauge (6) and a safety valve (7) through a pipeline.

2. The retractable mine pressure indicating apparatus of claim 1, wherein one end of the liquid outlet pipe (404) is fixedly connected with the liquid outlet (402), and the other end extends into the buffer tank (5) and is close to the bottom of the buffer tank (5).

3. The retractable mine pressure indicating device according to claim 1, wherein a floating plate (502) and a vertical rod (503) for mounting the floating plate (502) are arranged inside the buffer tank body (5), a mounting hole is formed in the floating plate (502), and one end of the vertical rod (503) penetrates through the mounting hole and is fixedly connected with the buffer tank body (5); be equipped with siren trigger switch (504) on the inside wall of the buffer tank body (5), upper portion one side of kickboard (502) is equipped with siren trigger (505), siren trigger (505) install in siren trigger switch's (504) downside, the outside of the buffer tank body (5) is equipped with siren (506), siren (506) respectively with siren trigger switch (504), siren trigger (505) are connected.

4. The retractable mine pressure indicating apparatus of claim 3, further comprising a power source (8), wherein the power source (8) is connected to the alarm (506), the alarm trigger switch (504), and the alarm trigger (505), respectively.

5. The retractable mine pressure indicating device according to claim 1, wherein a liquid outlet (507) is formed in one side of the bottom of the buffer tank body (5), the liquid outlet (507) is connected with a liquid storage tank (9) through a pipeline, a water pump (10) is arranged on one side of the liquid storage tank (9), and the water pump (10) is respectively connected with the liquid storage tank (9) and a liquid inlet (401) of the T-shaped connecting pipe (4) through pipelines.

6. The retractable mine pressure indicating apparatus of claim 1, wherein the vertical adjustment mechanism (3) comprises a fixed ring sleeve (31) sleeved on the outer wall of the piston cylinder (1), and a plurality of telescopic fixing mechanisms (32) uniformly arranged on the outer side of the fixed ring sleeve (31); the outer side wall of the piston cylinder (1) is provided with a limiting groove (101), and the fixed ring sleeve (31) is installed in the limiting groove (101).

7. The retractable mine pressure indicating apparatus of claim 6, wherein the telescopic fixing mechanism (32) comprises a transverse fixing rod (321) and a vertical jack (322), one end of the transverse fixing rod (321) being fixedly connected with the fixing collar (31) and the other end being fixedly connected with a movable plunger of the vertical jack (322).

8. The retractable mine pressure indicating device according to claim 7, wherein vertical limiting sliding rails (323) are arranged on two sides of the vertical jack (322), a protruding block (324) is arranged on one side of the transverse fixing rod (321) close to each vertical limiting sliding rail (323), and the protruding block (324) is mounted in the corresponding vertical limiting sliding rail (323) and can move along the vertical limiting sliding rail (323).

9. The retractable mine pressure indicating device of claim 1, wherein a top beam (11) and a top plate (12) are sequentially connected to the top of the piston rod (2), the top plate (12) is detachably connected to the top beam (11) through a hinge (13), and the top end of the piston rod (2) penetrates through the top beam (11) and is fixedly connected to the top beam (11).

10. The retractable mine pressure indicating device according to claim 1, wherein a closed cylinder (14) is arranged on the lower side of the piston cylinder (1), a base (15) is arranged at the bottom of the closed cylinder (14), a plurality of support legs (151) are uniformly arranged on the periphery of the bottom of the base (15), a bottom plate (16) is arranged on the lower side of the base (15), the base (15) and the plurality of support legs (151) on the periphery of the base (15) jointly enclose a groove cavity for accommodating the bottom plate (16), and a plurality of anti-skidding convex ribs (161) are arranged on one side, away from the base (15), of the bottom plate (16);

a piston (17) is arranged in the closed cylinder barrel (14), a pull rod (18) is arranged on the lower side of the piston (17), and one end of the pull rod (18) sequentially penetrates through the closed cylinder barrel (14) and the base (15) and is fixedly connected with the bottom plate (16); and a vent hole (141) is formed in one side of the top of the closed cylinder barrel (14), and a second pressure gauge (19) and a second safety valve (20) are sequentially connected to one side of the vent hole (141) through a pipeline.

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