An explosion-proof sealed gas sampling device

Abstract

The present application relates to the technical fields of industrial gas safety sampling, and discloses an explosion-proof sealed coal gas sampling device, which comprises a base and a control valve, the side of the base is provided with a gas sampling pipe in communication with a coke oven gas pipeline, the control valve is arranged above the base, the side of the control valve is provided with a bypass valve, the control valve is provided with a first sampling joint, and the bypass valve is provided with a second sampling joint. Compared with the prior art, the present application has the advantages that: multiple valves do not need to be operated step by step, the operation complexity and the training period are greatly reduced, the base and the control valve can be quickly disassembled, the plunger is clamped into the third clamping groove of the sealing plug when separated, the gas collection cavity is ensured to be sealed, the risk of coal gas leakage is avoided, special tools are not needed during maintenance, and a single person can complete the disassembly and assembly, the device is suitable for a double-valve gas sampling bag, in a blow washing mode, an external pump draws residual gas in the gas sampling bag through the second sampling joint, and new coal gas is injected from the first joint, the gas sampling bag is realized to be in a full-cycle closed blow washing, and the representativeness and purity of the sample are ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of industrial gas safety sampling, in particular to an explosion-proof sealed coal gas sampling device. BACKGROUND

[0002] Analyzing and sampling coke oven gas is a core link to ensure industrial production safety, environmental protection compliance, process optimization and efficient use of resources.

[0003] In the current operation process of our company, personnel need to hold sampling bags, which directly contact with coal gas, and there is a safety risk in the process. According to the safety standard of "Chemical Closed Sampling", it is required to install a closed sampler for coal gas sampling to avoid personnel contacting with coal gas.

[0004] The current sampling method of coke oven gas can refer to the group standard T / CCIAA29-2024 coke oven gas sampling operation technical specification. The sampling device described in the standard needs to be operated by field workers to open and close multiple valves, and the sampling process is relatively complicated, which requires a long time of operation training for workers.

[0005] The sampling gas path system involves a large number of valves, and the valves need to be frequently disassembled and assembled for subsequent maintenance, resulting in high maintenance cost.

[0006] In addition, the above-mentioned sampling device can only blow the pipeline at some positions when blowing the sampling gas path pipeline, and cannot blow the gas sampling bag. At present, a common double-valve gas sampling bag is available on the market. Our company believes that using such a gas sampling bag can blow the gas sampling bag together with the gas sampling bag in the blowing step to ensure the purity of the sample, but the existing sampling method cannot be directly adapted to the double-valve gas sampling bag. SUMMARY

[0007] The technical problem to be solved by the present application is that the existing sampling method is complicated to operate, has high maintenance cost, and cannot be adapted to the double-valve gas sampling bag. The present application provides an explosion-proof sealed coal gas sampling device.

[0008] To solve the above technical problems, the technical solution provided by the present application is as follows: an explosion-proof sealed coal gas sampling device, comprising a base and a control valve, the base is provided with a gas sampling pipe in communication with a coke oven gas pipeline on the side, the control valve is arranged above the base, the control valve is provided with a bypass valve on the side, the control valve is provided with a first sampling connector, and the bypass valve is provided with a second sampling connector.

[0009] The base is internally provided with a gas collecting cavity, the control valve is internally provided with an air guiding channel, the bottom of the air guiding channel is connected with the gas collecting cavity, the top is communicated with an exhaust cavity, the bypass valve is internally provided with a reversing cavity and a suction cavity arranged in horizontal direction, the reversing cavity and the suction cavity are communicated with each other, the middle of the air guiding channel is provided with an annular bypass groove, one side of the bypass groove is provided with a plurality of first air guiding holes communicated with the reversing cavity, the suction cavity is communicated with a sampling pump connecting pipe, a first sampling connector is communicated with the exhaust cavity, a second sampling connector is communicated with the side of the reversing cavity, the center of the gas collecting cavity is provided with a sleeve, the sleeve is internally provided with a sealing plug sliding in vertical direction, the air guiding channel is internally provided with a gas guiding sliding sleeve sliding in vertical direction, the gas guiding sliding sleeve is internally provided with a top rod slidingly sleeved, the reversing cavity is internally provided with a reversing valve core sliding in horizontal direction.

[0010] Further, the sleeve is internally provided with a spring to upwardly extend the sealing plug to seal the gas collecting cavity, the top rod can downwardly extend the sealing plug to communicate the bottom of the air guiding channel with the gas collecting cavity, the gas guiding sliding sleeve is provided with a plurality of second air guiding holes extending in vertical direction around the circumference, the middle is provided with an annular first clamping groove, the exhaust cavity is internally provided with a plurality of sealing columns matched with the second air guiding holes, the gas guiding sliding sleeve is at the upper dead point, the sealing columns seal the second air guiding holes, one end of the reversing valve core extends into the bypass groove and is provided with a spherical head, the other end extends to the outside of the bypass valve, the outside of the bypass valve is provided with a spring to upwardly extend the reversing valve core to the bypass groove, the spherical head of the reversing valve core abuts against the side wall of the gas guiding sliding sleeve to seal the reversing cavity and the suction cavity, the spherical head of the reversing valve core is clamped into the first clamping groove to seal the first air guiding hole.

[0011] Further, a plurality of guide rods are arranged above the air guiding channel, the top of the gas guiding sliding sleeve is provided with a plurality of guide holes matched with the guide rods, the inside of the gas guiding sliding sleeve is provided with a rotation stopping pin, the side of the top rod is provided with a sliding groove matched with the rotation stopping pin.

[0012] Further, the top of the control valve is provided with a turnover handle and a speed reducer, the end of the turnover handle is connected with the top of the gas guiding sliding sleeve to control the vertical sliding of the gas guiding sliding sleeve, the output end of the speed reducer is threadedly connected with a screw rod, the bottom end of the screw rod is fixedly connected with the top of the top rod to control the vertical sliding of the top rod.

[0013] Further, a separation locking ring is slidingly sleeved on the control valve, a spring is arranged to upwardly extend the separation locking ring, a plurality of radial sliding balls are arranged around the side of the control valve, the bottom of the separation locking ring is provided with a first taper and a second taper arranged in a stepped manner from top to bottom and outwardly protruding.

[0014] Further, a connecting sleeve is slidingly sleeved on the top of the base, a spring is arranged to downwardly extend the connecting sleeve, a second clamping groove matched with the balls is arranged around the top inner circle of the connecting sleeve.

[0015] Further, a sealing locking ring is slidingly sleeved on the base, a spring is arranged to upwardly extend the sealing locking ring, a taper groove is arranged in the bottom inner circle of the sealing locking ring.

[0016] Further, the middle of the sealing plug is provided with an annular third clamping groove, the inside of the base is provided with a plurality of radially sliding plungers, one end of the plunger is provided with an arc-shaped inclined surface matched with the conical groove, and the other end is provided with a ball head matched with the third clamping groove.

[0017] Compared with the prior art, the present application has the following advantages:

[0018] By overturning the handle + speed reducer linkage control air guide sleeve and ejector rod, the blowing and sampling modes are quickly switched, multiple valves do not need to be operated step by step, and the operation complexity and training cycle are greatly reduced.

[0019] The quick separation locking mechanism is composed of a separation locking ring, a connecting sleeve and a ball, the base and the control valve are quickly disassembled, the plunger is clamped into the third clamping groove of the sealing plug when separated, the gas collection cavity is sealed, the risk of gas leakage is avoided, special tools are not needed during maintenance, a single person can complete the disassembly and assembly, and the maintenance time and cost are reduced.

[0020] The double-valve gas sampling bag is adapted, in the blowing mode, residual gas in the gas sampling bag is pumped out by the external pump through the second sampling joint, and new coal gas is injected from the first joint, so that the gas sampling bag is circularly blown in a closed mode, and the sample representativeness and purity are ensured. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a structural schematic diagram of the present application.

[0022] Figure 2 is a sectional view of the present application.

[0023] Figure 3 is a structural schematic diagram of the present application when the sealing plug is opened.

[0024] Figure 4 is a structural schematic diagram of the present application when blowing.

[0025] Figure 5 is a structural schematic diagram of the present application when sampling.

[0026] Figure 6 is a schematic diagram of the gas sampling bag connection mode of the present application.

[0027] Figure 7 is a structural schematic diagram of the suction chamber and the exhaust chamber of the present application.

[0028] Figure 8 is a structural schematic diagram of the air guide sleeve of the present application.

[0029] Figure 9 is a structural schematic diagram of the ejector rod of the present application.

[0030] Figure 10 is a structural schematic diagram of the bypass groove of the present application.

[0031] Figure 11 is the structure diagram of the separated locking ring of the present application.

[0032] Figure 12 is the structure diagram of the connecting sleeve of the present application.

[0033] Figure 13 is the structure diagram of the sealing locking ring of the present application.

[0034] Figure 14 is the structure diagram of the plunger of the present application.

[0035] Figure 15 is the structure diagram of the sealing plug of the present application.

[0036] Figure 16 is the structure diagram of the control valve after unlocking of the present application.

[0037] Figure 17 is the structure diagram of the sealing plug after locking of the present application.

[0038] As shown in the figure: 1, base, 2, control valve, 3, gas sampling pipe, 4, bypass valve, 5, sampling pump connecting pipe, 6, first sampling joint, 7, second sampling joint, 8, reversing handle, 9, speed reducer, 10, screw rod, 11, gas collection cavity, 12, sleeve, 13, sealing plug, 14, connecting sleeve, 15, sealing locking ring, 16, plunger, 17, air guide channel, 18, air guide sliding sleeve, 19, jacking rod, 20, separated locking ring, 21, ball, 22, bypass groove, 23, reversing cavity, 24, suction cavity, 25, reversing valve core, 26, first air guide hole, 27, extension pipe, 28, exhaust cavity, 29, second air guide hole, 30, first clamping groove, 31, sealing column, 32, gas sampling bag, 33, simple valve, 34, guide hole, 35, rotation stopping pin, 36, sliding groove, 37, guide rod, 38, first conical surface, 39, second conical surface, 40, second clamping groove, 41, conical surface groove, 42, arc inclined surface, 43, third clamping groove. DETAILED DESCRIPTION

[0039] The present application will be further described in detail below in combination with the drawings.

[0040] In combination with the drawings Figure 1 , the drawings Figure 6 , and the drawings Figure 7 , an explosion-proof sealed gas sampling device includes a base 1 and a control valve 2, the base 1 is provided with a gas sampling pipe 3 in communication with the coke oven gas pipeline on the side, and the control valve 2 is arranged above the base 1, the control valve 2 is provided with a bypass valve 4 on the side, the control valve 2 is provided with a first sampling joint 6, the bypass valve 4 is provided with an extension pipe 27, and the extension pipe 27 is provided with a second sampling joint 7 at the end.

[0041] In combination with the drawingsFigure 2 The base 1 is internally provided with a gas collecting cavity 11, the control valve 2 is internally provided with a gas guiding channel 17, the bottom of the gas guiding channel 17 is connected with the gas collecting cavity 11, the top is communicated with an exhaust cavity 28, the bypass valve 4 is internally provided with a reversing cavity 23 and a suction cavity 24 arranged in horizontal direction, the reversing cavity 23 and the suction cavity 24 are communicated with each other, the middle of the gas guiding channel 17 is provided with an annular bypass groove 22, one side of the bypass groove 22 is provided with a plurality of first gas guiding holes 26 communicated with the reversing cavity 23, the suction cavity 24 is communicated with a sampling pump connecting pipe 5, a first sampling connector 6 is communicated with the exhaust cavity 28, a second sampling connector 7 is communicated with the side of the reversing cavity 23, the center of the gas collecting cavity 11 is provided with a sleeve 12, the sleeve 12 is internally provided with a sealing plug 13 sliding in vertical direction, the gas guiding channel 17 is internally provided with a gas guiding sleeve 18 sliding in vertical direction, the gas guiding sleeve 18 is internally provided with a top rod 19 slidingly sleeved, the reversing cavity 23 is internally provided with a reversing valve core 25 sliding in horizontal direction.

[0042] Combined with the drawings Figure 2 , the drawings Figure 8 , the drawings Figure 9 and the drawings Figure 10 , the sleeve 12 is internally provided with a spring to upwardly push the sealing plug 13 to seal the gas collecting cavity 11, the top rod 19 can downwardly push the sealing plug 13 to communicate the bottom of the gas guiding channel 17 with the gas collecting cavity 11, the gas guiding sleeve 18 is surrounded by a plurality of second gas guiding holes 29 extending in vertical direction, the middle is provided with an annular first clamping groove 30, the exhaust cavity 28 is internally provided with a plurality of sealing columns 31 matched with the second gas guiding holes 29, when the gas guiding sleeve 18 is at the upper dead point, the sealing columns 31 seal the second gas guiding holes 29, one end of the reversing valve core 25 extends into the bypass groove 22 and is provided with a ball head, the other end extends to the outside of the bypass valve 4, the outside of the bypass valve 4 is provided with a spring to upwardly push the reversing valve core 25 to the bypass groove 22, the position of the reversing valve core 25 can be observed by naked eyes from the outside, when the ball head of the reversing valve core 25 abuts against the side wall of the gas guiding sleeve 18, the reversing cavity 23 and the suction cavity 24 are sealed, when the ball head of the reversing valve core 25 is clamped into the first clamping groove 30, the first gas guiding holes 26 are sealed.

[0043] Combined with the drawings Figure 2 and the drawings Figure 3 , when the gas guiding sleeve 18 is at the upper dead point, the reversing valve core 25 seals the reversing cavity 23 and the suction cavity 24, the sealing columns 31 seal the second gas guiding holes 29, the gas guiding sleeve 18 seals the bypass groove 22, in this state, the whole device is in a sealed state.

[0044] Refer to the drawings Figure 4When the gas guide sleeve 18 slides down until the ball head of the reversing valve core 25 end is clamped into the first clamping groove 30, the reversing cavity 23 and the suction cavity 24 are communicated at this state, the external sampling pump can draw air from the second sampling joint 7 through the sampling pump connecting pipe 5, and the gas in the gas collection cavity 11 can enter the exhaust cavity 28 through the second gas guide hole 29 and finally be discharged from the first sampling joint 6.

[0045] Referring to the drawings Figure 5 When the gas guide sleeve 18 slides down to the lower stop point, the gas in the gas collection cavity 11 can first enter the bypass groove 22 through the second gas guide hole 29, and then enter the reversing cavity 23 through the first gas guide hole 26 and be discharged from the second sampling joint 7, and then enter the exhaust cavity 28 through the second gas guide hole 29 and finally be discharged from the first sampling joint 6, while the external sampling pump cannot be suctioned through the suction cavity 24.

[0046] Referring to the drawings Figure 8 , the drawings Figure 9 and the drawings Figure 10 , a plurality of guide rods 37 are arranged above the air guide channel 17, a plurality of guide holes 34 matched with the guide rods 37 are arranged on the top of the gas guide sleeve 18, a rotation stopping pin 35 is arranged inside the gas guide sleeve 18, and a sliding groove 36 matched with the rotation stopping pin 35 is arranged on the side of the top rod 19.

[0047] Referring to the drawings Figure 1 , the drawings Figure 8 and the drawings Figure 9 , a turnover handle 8 and a speed reducer 9 are arranged on the top of the control valve 2, the end of the turnover handle 8 is connected with the top of the gas guide sleeve 18, the turnover handle 8 controls the vertical sliding of the gas guide sleeve 18, a screw rod 10 is threadedly connected to the output end of the speed reducer 9, and the bottom end of the screw rod 10 is fixedly connected with the top of the top rod 19, and the top rod 19 controls the vertical sliding of the top rod 19.

[0048] The way in which the gas sampling bag 32 is connected with the device is described with reference to the drawings Figure 6 The simple valve 33 on the gas sampling bag 32, the first sampling joint 6 and the second sampling joint 7 are prior art, and will not be described further.

[0049] After the gas sampling bag 32 is connected by the staff, first, the position of the reversing valve core 25 is observed from the side of the bypass valve 4, then the device is adjusted to the state shown in the drawings Figure 4 by pulling the turnover handle 8, and the hand wheel of the input shaft of the speed reducer 9 is rotated to make the top rod 19 descend and press the sealing plug 13, the gas first enters the air guide channel 17 through the gas collection cavity 11, enters the exhaust cavity 28 through the second gas guide hole 29, enters the gas sampling bag 32 through the first sampling joint 6, and the external sampling pump sequentially draws the gas in the gas sampling bag 32 from the reversing cavity 23 and the second sampling joint 7 through the suction cavity 24, forming a gas displacement cycle and realizing the purging of the sample gas in the gas sampling bag 32.

[0050] After blowing and washing three times, turn the flip handle 8 again to adjust the device to the attached position. Figure 5 As shown, gas is simultaneously introduced into the gas sampling bag 32 through the first sampling connector 6 and the second sampling connector 7. During the process, the flow rate can be simply adjusted by changing the position of the sealing plug 13 through the reducer 9. After the gas sampling bag 32 is full, the top rod 19 is moved up to the upper stop point and closed. A new gas sampling bag 32 is installed and the above steps are repeated for the next round of purging and sampling.

[0051] To facilitate future maintenance of the device, the base 1 and the control valve 2 are equipped with a mechanism that allows for quick separation and locking.

[0052] Combined with appendix Figure 11 Appendix Figure 16 and attached Figure 17 The control valve 2 is slidably fitted with a separation locking ring 20, and a spring is provided to push the separation locking ring 20 upward. The control valve 2 has multiple radially sliding balls 21 around its side. The outer ring of the control valve 2 has a limit for the balls 21. The bottom of the separation locking ring 20 has a first cone 38 and a second cone 39 arranged in a stepped manner from top to bottom and protruding outward.

[0053] Combined with appendix Figure 12 Appendix Figure 16 and attached Figure 17 The top of the base 1 is slidably fitted with a connecting sleeve 14, and a spring is provided to push the connecting sleeve 14 downward. The inner ring of the top of the connecting sleeve 14 is provided with a second groove 40 for cooperating ball 21.

[0054] Combined with appendix Figure 13 Appendix Figure 16 and attached Figure 17 A sealing locking ring 15 is slidably sleeved on the base 1, and a spring is provided to push the sealing locking ring 15 upward. The inner ring of the bottom of the sealing locking ring 15 is provided with a conical groove 41.

[0055] Combined with appendix Figure 14 Appendix Figure 15 Appendix Figure 16 and attached Figure 17 The sealing plug 13 has an annular third groove 43 in the middle, and the base 1 has multiple radially sliding plungers 16 inside. One end of the plunger 16 has an arc-shaped inclined surface 42 that matches the conical groove 41, and the other end is a ball head that matches the third groove 43.

[0056] When the base 1 and the control valve 2 are connected in the locked state, the spring pushes the separation locking ring 20 upward, the second taper 39 pushes the ball 21 outward to the limit, the ball 21 is clamped into the second clamping groove 40 of the inner ring of the connecting sleeve 14, the bottom end face of the control valve 2 pushes the sealing locking ring 15 downward, the plunger 16 can move freely, the third clamping groove 43 can push the plunger 16 outward when the sealing plug 13 moves vertically, and the plunger 16 cannot interfere with the movement of the sealing plug 13.

[0057] When separation is needed, the staff manually presses the separation locking ring 20 downward, the connecting sleeve 14 is pushed downward by the spring, the second clamping groove 40 pushes the ball 21 inward and abuts against the first taper 38, the connecting sleeve 14 cannot align with the ball 21 after moving downward, and the locking between the base 1 and the control valve 2 is released.

[0058] After unlocking, the control valve 2 is lifted upward, the sealing locking ring 15 and the sealing plug 13 are pushed upward by the spring, the sealing plug 13 cannot be pressed downward by the top rod 19 after the control valve 2 is lifted upward, and the sealing plug 13 is abutted upward at the upper stop point, the sealing locking ring 15 pushes the plunger 16 inward through the taper groove 41 and the arc inclined surface 42 to make the ball head of the plunger 16 clamped into the third clamping groove 43, one end of the plunger 16 abuts against the bottom inner ring of the sealing locking ring 15, and the other end of the plunger 16 is clamped into the third clamping groove 43, and the sealing plug 13 cannot move axially, so that the sealing plug 13 is locked, and the top of the gas collecting cavity 11 is completely sealed.

[0059] When connection is needed again, the control valve 2 is placed on the base 1 first, the sealing locking ring 15 is pressed downward by the bottom end face of the control valve 2, the locking of the plunger 16 and the sealing plug 13 is released, then the separation locking ring 20 is pressed, and the connecting sleeve 14 is lifted upward, the connecting sleeve 14 pushes the ball 21 inward until the second clamping groove 40 is roughly aligned with the ball 21, then the separation locking ring 20 is released to push the ball 21 outward and clamped into the second clamping groove 40, and finally the connecting sleeve 14 is released to complete the locking.

[0060] After the base 1 and the control valve 2 are locked, the connecting sleeve 14 is pushed downward by the spring, the connecting sleeve 14 pulls the control valve 2 downward as a whole through the ball 21, and the connecting sleeve 14 serves as an additional sealing force between the base 1 and the control valve 2.

[0061] The above describes the present application and its embodiments, which are not limited. The actual structure is not limited to this. In general, if a person skilled in the art is inspired by this, without departing from the purpose of the present application, similar structure and embodiments can be designed without creativity, which should belong to the protection scope of the present application.

Claims

1. An explosion-proof sealed gas sampling device, comprising a base (1) and a control valve (2), the base (1) being provided with a gas sampling pipe (3) on the side to communicate with a coke oven gas pipeline, the control valve (2) being arranged above the base (1), the control valve (2) being provided with a bypass valve (4) on the side, the control valve (2) being provided with a first sampling joint (6), and the bypass valve (4) being provided with a second sampling joint (7), characterized in that: the base (1) is internally provided with a gas collecting cavity (11), the control valve (2) is internally provided with a gas guiding channel (17), the bottom of the gas guiding channel (17) is connected with the gas collecting cavity (11), the top is provided with an exhaust cavity (28) in communication, the bypass valve (4) is internally provided with a reversing cavity (23) and a suction cavity (24) arranged in a horizontal direction, the reversing cavity (23) and the suction cavity (24) are in communication with each other, the middle of the gas guiding channel (17) is provided with an annular bypass groove (22), one side of the bypass groove (22) is provided with a plurality of first gas guiding holes (26) in communication with the reversing cavity (23), the suction cavity (24) is provided with a sampling pump connecting pipe (5) in communication, the first sampling joint (6) is in communication with the exhaust cavity (28), the second sampling joint (7) is in communication with the side of the reversing cavity (23), the center of the gas collecting cavity (11) is provided with a sleeve (12), the sleeve (12) is internally provided with a sealing plug (13) sliding in a vertical direction, the gas guiding channel (17) is internally provided with a gas guiding sliding sleeve (18) sliding in a vertical direction, the gas guiding sliding sleeve (18) is internally provided with a top rod (19) slidingly sleeved, and the reversing cavity (23) is internally provided with a reversing valve core (25) sliding in a horizontal direction. The inside of the sleeve (12) is provided with a spring to upwardly extend the sealing plug (13) to seal the gas collecting cavity (11), the top rod (19) can downwardly extend the sealing plug (13) to connect the bottom of the gas guiding channel (17) with the gas collecting cavity (11), the gas guiding sliding sleeve (18) is provided with a plurality of second gas guiding holes (29) extending in a vertical direction around the circumference, is provided with an annular first clamping groove (30) in the middle, is provided with a plurality of sealing columns (31) in the exhaust cavity (28) matched with the second gas guiding holes (29), the sealing column (31) seals the second gas guiding hole (29) when the gas guiding sliding sleeve (18) is at the upper dead point, and the gas guiding sliding sleeve (18) seals the bypass groove (22) in the lower section, one end of the reversing valve core (25) extends into the bypass groove (22) and is provided as a ball head, the other end extends to the outside of the bypass valve (4), the outside of the bypass valve (4) is provided with a spring to upwardly extend the reversing valve core (25) to the bypass groove (22), the ball head of the reversing valve core (25) abuts against the side wall of the gas guiding sliding sleeve (18) to seal the reversing cavity (23) and the suction cavity (24), and the ball head of the reversing valve core (25) is clamped into the first clamping groove (30) to seal the first gas guiding hole (26). A plurality of guide rods (37) are arranged above the gas guiding channel (17), the top of the gas guiding sliding sleeve (18) is provided with a plurality of guide holes (34) matched with the guide rods (37), the inside of the gas guiding sliding sleeve (18) is provided with a rotation stopping pin (35), and the side of the top rod (19) is provided with a sliding groove (36) matched with the rotation stopping pin (35).

2. An explosion-proof sealed gas sampling device according to claim 1, characterised in that: ​ 3. An explosion-proof sealed gas sampling device according to claim 1, characterised in that: The control valve (2) is provided with a turnover handle (8) and a speed reducer (9) at the top, wherein the end of the turnover handle (8) is connected with the top of a gas guide sleeve (18), the gas guide sleeve (18) is controlled to slide vertically, the output end of the speed reducer (9) is threadedly connected with a screw rod (10), the bottom end of the screw rod (10) is fixedly connected with the top of a top rod (19), and the top rod (19) is controlled to slide vertically.

4. The explosion-proof sealed gas sampling device of claim 1, wherein: A separation locking ring (20) is slidably arranged on the control valve (2) and is upwardly extended by a spring, a plurality of radial sliding balls (21) are arranged around the side surface of the control valve (2), and the bottom of the separation locking ring (20) is provided with a first conical platform (38) and a second conical platform (39) arranged in a stepped manner from top to bottom and outwardly protruding.

5. An explosion-proof sealed gas sampling device according to claim 4, characterised in that: The top of the base (1) is slidably sleeved with a connecting sleeve (14), and the connecting sleeve (14) is downwardly extended by a spring, the top of the connecting sleeve (14) is provided with a second clamping groove (40) around the inner circle and matched with the balls (21).

6. The explosion-proof sealed gas sampling device of claim 1, wherein: The base (1) is slidably sleeved with a sealing locking ring (15), and the sealing locking ring (15) is upwardly extended by a spring, and the bottom of the sealing locking ring (15) is provided with a conical groove (41) around the inner circle.

7. An explosion-proof closed gas sampling device according to claim 6, characterised in that: The middle of the sealing plug (13) is provided with an annular third clamping groove (43), the inside of the base (1) is provided with a plurality of radial sliding plungers (16), one end of the plunger (16) is provided with an arc-shaped inclined surface (42) matched with the conical groove (41), and the other end is provided with a ball head matched with the third clamping groove (43).

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