Pipeline gas leakage detection device and detection method thereof

Abstract

The present invention belongs to the technical field of pipeline leakage detection, and specifically relates to a pipeline gas leakage detection device and a detection method thereof, comprising a base, a support seat is fixedly connected to the upper side of the base, a positioning mechanism is arranged on the base, a lubrication component and a detection component are arranged on the positioning mechanism, and the positioning mechanism comprises a motor, the motor is fixedly connected to the outer wall of the base, and a bidirectional screw is rotatably connected to the inner surface of the groove of the base. The pipeline gas leakage detection device and the detection method thereof realize efficient sealing of both ends of the pipeline to be detected through the ingenious combination of the sealing airbag and the compensation component. When the circular plate contacts the pipeline and continues to move, the sealing airbag expands due to the filling of gas, and fits tightly to the inner wall of the pipeline, effectively compensating for the problem of poor sealing caused by differences in the shape or size of the pipeline. This design not only improves the sealing effect, but also ensures the accuracy of the detection results, greatly improving the detection efficiency and reliability.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline leakage detection, and in particular to a pipeline gas leakage detection device and a detection method thereof. Background Art

[0002] At present, in the production process of pipelines, it is necessary to perform leakage detection on the pipelines to ensure the quality of the pipelines. In the prior art, for example, a Chinese patent with a publication number of CN220751477U discloses a pipeline leakage detection device. The device is provided with a second slide groove on a base, and then a movable detection slide is provided. A detector is fixedly installed on the detection slide. An electronic device is used, and the detectors are evenly distributed inside the through hole. A display screen and an alarm are used to display the results, thereby reducing the error of manual observation, making the detection result more accurate, and making it easier to find the exact location of the leak.

[0003] However, the device still has the following defects in actual use: since both ends of the pipeline need to be sealed during the pipeline leakage detection process, there is a lack of sealing compensation mechanisms at both ends of the pipeline, resulting in poor sealing effect and a certain risk of gas leakage. In view of this, a pipeline gas leakage detection device and a detection method thereof are proposed. Summary of the invention

[0004] The main purpose of the present invention is to provide a pipeline gas leakage detection device and a detection method thereof, which can solve the problems raised in the above background technology.

[0005] To achieve the above object, the pipeline gas leakage detection device proposed in the present invention includes a base, a support seat is fixedly connected to the upper side of the base, a positioning mechanism is provided on the base, a lubrication component and a detection component are provided on the positioning mechanism, and the positioning mechanism includes: A motor, the motor is fixedly connected to the outer wall of the base, the inner surface of the groove of the base is rotatably connected with a bidirectional screw rod, and the motor is fixedly connected to the bidirectional screw rod; A sliding block, wherein the sliding block is slidably connected in the groove of the base, and a support is fixedly connected to the upper side of the sliding block; A compensation component, wherein the compensation component is arranged on the support column; Among them, the compensation component includes a fixed seat, which is fixedly connected to the top of the pillar, and a circular plate is slidably connected to the inner wall of the fixed seat. A supporting protrusion is fixedly connected to the side of the circular plate away from the detection component, and a sealing airbag is fixedly connected to the side of the support protrusion away from the circular plate.

[0006] Preferably, a piston rod is fixedly connected to the side of the circular plate away from the supporting protrusion, an air cylinder is fixedly connected to the inner wall of the fixed seat, the piston rod is connected to the air cylinder piston, the piston rod and the inner wall of the air cylinder are elastically connected via a return spring, and the air cylinder is connected to the sealing airbag via a soft connecting tube.

[0007] Preferably, a limiting plate is fixedly connected to the inner wall of the fixing seat, a connecting block is fixedly connected to the side of the circular plate away from the supporting protrusion, an oblique groove is opened on the outer wall of the connecting block, and a round rod is slidably connected in the oblique groove.

[0008] Preferably, an internal threaded barrel is rotatably connected to the inner wall of the sliding block, the internal threaded barrel is threadedly connected to the bidirectional screw rod, a socket is opened on the outer wall of the internal threaded barrel, a plug rod is inserted into the socket, and the top of the plug rod is penetrated by a round rod and rotatably connected to the round rod.

[0009] Preferably, a limiting opening is provided on the outer wall of the internal threaded cylinder, a limiting block is fixedly connected to the outer wall of the sliding block, a one-way limiting rod is rotatably connected to the outer wall of the sliding block, and the one-way limiting rod is elastically connected to the limiting block via an arc spring.

[0010] Preferably, two groups of the one-way limiting rods are provided, and a straight slot is formed on the outer wall of one group of the one-way limiting rods.

[0011] Preferably, the lubrication assembly comprises an oil tank, an outer wall of which is fixedly connected with an elastic contact switch and a valve body, the oil tank is connected with an oil replenishing pipe, and one end of the oil replenishing pipe away from the oil tank is connected with the inner surface of the sliding block.

[0012] Preferably, a guide block is fixedly connected to the outer wall of the sliding block, an L-rod is slidably connected to the guide block, a second round rod is fixedly connected to the bottom of the L-rod, and the second round rod is slidably connected in the straight slot.

[0013] Preferably, the detection component includes a mounting plate and a pressure gauge, an air pump is fixedly mounted on the mounting plate, the air pump is connected to a soft air pipe, and the soft air pipe passes through a fixing seat.

[0014] The present invention provides a detection method for a pipeline gas leakage detection device, comprising the following steps: S1. First, place the pipeline to be inspected on the support seat, then start the output shaft of the motor to rotate clockwise, driving the bidirectional screw to rotate clockwise. Since the plug rod is inserted into the plug hole, the internal threaded tube will not rotate relative to the sliding block. The sliding block moves in the groove of the base, so that the fixed seat moves toward the end of the pipeline to be inspected, thereby sealing the end of the pipeline to be inspected; S2, the circular plate contacts the pipeline to be detected, the supporting protrusion is inserted into the inner wall of the pipeline to be detected, and the circular plate continues to move toward the end of the pipeline to be detected. The pipeline to be detected squeezes the circular plate, and the piston rod squeezes the gas cylinder. The gas in the gas cylinder enters the sealing airbag through the soft connecting tube. The sealing airbag expands and contacts closely with the inner wall of the pipeline to be detected, thereby compensating for the sealing of both ends of the pipeline to be detected, improving its sealing effect, and thus ensuring the accuracy of the detection result; S3. After the circular plate moves to the limit plate, the connecting block moves, and the round rod slides in the inclined groove, driving the insertion rod away from the insertion hole, releasing the limit on the internal threaded barrel, and the bidirectional screw continues to rotate clockwise to drive the internal threaded barrel to rotate, and the fixed seat will no longer continue to move toward the end of the pipeline to be tested, preventing the damage of the compensation component parts caused by excessive extrusion of the fixed seat; S4. During the rotation of the internal threaded barrel, the one-way limit rod swings back and forth under the action of the arc spring, driving the second round rod to slide in the straight slot, and the L rod slides up and down reciprocatingly under the action of the guide block, squeezing the elastic contact switch, so that the valve body transfers the lubricating oil in the oil tank to the inner surface of the sliding block, reducing the friction between the rotation of the internal threaded barrel and the sliding block; S5. Start the air pump again, add gas into the pipeline to be tested, and then test it through the pressure gauge. After a period of time, if the reading of the pressure gauge does not change, it indicates that the pipeline to be tested is not leaking. Otherwise, the pipeline to be tested is leaking. After the test is completed, start the output shaft of the motor to rotate counterclockwise. Due to the limitation of the one-way limiting rod by the limiting block, the internal threaded barrel will not rotate relative to the sliding block, so that the sliding block slides and resets in the groove of the base.

[0015] The present invention provides a pipeline gas leakage detection device and a detection method thereof, which have the following beneficial effects: (1) The pipeline gas leakage detection device and its detection method realize efficient sealing of both ends of the pipeline to be detected through the ingenious combination of the sealing airbag and the compensation component. When the circular plate contacts the pipeline and continues to move, the sealing airbag expands due to the filling of gas and fits tightly to the inner wall of the pipeline, effectively compensating for the poor sealing problem caused by the difference in pipeline shape or size. This design not only improves the sealing effect, but also ensures the accuracy of the detection results, greatly improving the detection efficiency and reliability.

[0016] (2) The pipeline gas leakage detection device and the detection method thereof realize an intelligent limiting function through the design of the internal threaded tube and the sliding block through the plug rod and the inclined groove. When the circular plate moves to the limiting plate, the plug rod automatically disengages from the plug hole, releasing the limit on the internal threaded tube and preventing damage to parts caused by excessive extrusion. This design not only protects the compensation component, but also extends the service life of the device, while also ensuring safety during the detection process.

[0017] (3) The pipeline gas leakage detection device and its detection method realize automatic lubrication function during the detection process through the cooperation of the one-way limit rod and the elastic contact switch. When the internal threaded barrel rotates, the one-way limit rod drives the L rod to slide up and down, squeezes the elastic contact switch, triggers the valve body to transport lubricating oil to the inner surface of the sliding block, effectively reduces the rotation friction, and improves the operation efficiency and stability of the device. This design not only reduces energy consumption, but also improves the detection accuracy.

[0018] (4) The pipeline gas leakage detection device and its detection method are easy to operate. It only requires placing the pipeline to be detected on the support seat and starting the motor and air pump to complete the detection process. The device monitors the changes in gas pressure in the pipeline in real time through the pressure gauge and accurately determines whether the pipeline is leaking. This design not only improves the detection efficiency, but also reduces the difficulty of operation, making the detection work easier and more convenient. At the same time, the reset function of the device also ensures the smooth progress of the next detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0020] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of a partial three-dimensional structure of the present invention; Figure 3 For the present invention Figure 2 Schematic diagram of the structure of A; Figure 4 It is a schematic diagram of the overall cross-sectional structure of the present invention; Figure 5 For the present invention Figure 4 Schematic diagram of the structure of middle B; Figure 6 For the present invention Figure 4 Schematic diagram of the C structure; Figure 7 It is a partial structural schematic diagram of the compensation component of the present invention; Figure 8 It is a partial structural schematic diagram of the positioning mechanism of the present invention; Fig. 9 For the present invention Figure 8 Schematic diagram of the D structure; Fig.10 It is a partial structural schematic diagram of the lubrication assembly and the positioning mechanism of the present invention; Fig.11It is a schematic diagram of the structure of the internal threaded barrel of the present invention.

[0021] Description of Figure Numbers: 1. Base; 2. Support seat; 3. Positioning mechanism; 4. Lubrication assembly; 5. Detection assembly; 31. Motor; 32. Bidirectional screw rod; 33. Sliding block; 34. Pillar; 35. Compensation assembly; 331. Internal threaded cylinder; 332. Socket; 333. Insert rod; 334. Limit block; 335. One-way limit rod; 336. Straight notch; 351. Fixed seat; 352. Round plate; 353. Support convex block; 354. Sealing airbag; 355. Piston rod; 356. Air cylinder; 357. Soft connecting pipe; 358. Limit plate; 359. Connecting block; 3510. Inclined groove; 3511. Round rod one; 41. Oil tank; 42. Contact switch; 43. Valve body; 44. Oil supply pipe; 45. L-rod; 46. Guide block; 47. Round rod two; 51. Mounting plate; 52. Air pump; 53. Soft air pipe; 54. Pressure gauge.

[0022] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] See also Figure 1-Figure 11 The present invention proposes a pipeline gas leakage detection device, including a base 1, a support base 2 is fixedly connected to the upper side of the base 1, a positioning mechanism 3 is arranged on the base 1, a lubrication component 4 and a detection component 5 are arranged on the positioning mechanism 3, the positioning mechanism 3 includes a motor 31, a sliding block 33, and a compensation component 35, the motor 31 is fixedly connected to the outer wall of the base 1, a bidirectional screw rod 32 is rotatably connected to the inner surface of the groove of the base 1, the motor 31 is fixedly connected to the bidirectional screw rod 32, the sliding block 33 is slidably connected in the groove of the base 1, a pillar 34 is fixedly connected to the upper side of the sliding block 33, and the compensation component 35 is arranged on the pillar 34.

[0025] In the embodiment of the present invention, in order to realize the compensation of the seals at both ends of the pipeline to be detected, specifically, the compensation component 35 includes a fixed seat 351, the fixed seat 351 is fixedly connected to the top of the pillar 34, a circular plate 352 is slidably connected to the inner wall of the fixed seat 351, a side of the circular plate 352 away from the detection component 5 is fixedly connected to a support protrusion 353, a side of the support protrusion 353 away from the circular plate 352 is fixedly connected to a sealing airbag 354, a side of the circular plate 352 away from the support protrusion 353 is fixedly connected to a piston rod 355, and an air cylinder 356 is fixedly connected to the inner wall of the fixed seat 351. The piston rod 355 is connected to the piston of the air cylinder 356. The piston rod 355 is elastically connected to the inner wall of the air cylinder 356 through a return spring. The air cylinder 356 is connected to the sealing air bag 354 through a soft connecting tube 357. A limiting plate 358 is fixedly connected to the inner wall of the fixed seat 351. A connecting block 359 is fixedly connected to the side of the circular plate 352 away from the supporting protrusion 353. An inclined groove 3510 is opened on the outer wall of the connecting block 359. A round rod 3511 is slidably connected in the inclined groove 3510. An internal threaded cylinder 331 is rotatably connected to the inner wall of the sliding block 33. The internal threaded cylinder 331 is threaded with the two-way screw rod 32. The outer wall of the internal threaded tube 331 is provided with a socket 332, and the socket 332 is plugged with a plug rod 333. The top of the plug rod 333 is penetrated by a round rod 3511 and is rotatably connected to the round rod 3511. By starting the output shaft of the motor 31 to rotate clockwise, the bidirectional screw rod 32 is driven to rotate clockwise. Since the plug rod 333 is inserted into the socket 332, the internal threaded tube 331 will not rotate relative to the sliding block 33. The sliding block 33 moves in the groove of the base 1, so that the fixed seat 351 moves toward the end of the pipeline to be detected, so as to achieve the end of the pipeline to be detected. The plug rod 333 is inserted into the socket 332, and the fixed seat 351 is moved to the end of the pipeline to be detected. The plug rod 333 is inserted into the socket 332, and the fixed seat 351 is moved to the end of the pipeline to be detected. The plug rod 333 is inserted into the socket 332, and the end of the pipeline to be detected is blocked. At the same time, the circular plate 352 After contacting the pipeline to be inspected, the supporting protrusion 353 is inserted into the inner wall of the pipeline to be inspected. When the circular plate 352 continues to move toward the end of the pipeline to be inspected, the pipeline to be inspected squeezes the circular plate 352, and the piston rod 355 squeezes the gas cylinder 356. The gas in the gas cylinder 356 enters the sealing airbag 354 through the soft connecting tube 357. The sealing airbag 354 expands and contacts closely with the inner wall of the pipeline to be inspected, which effectively compensates for the problem of poor sealing caused by differences in pipeline shape or size. This design not only improves the sealing effect, but also ensures the accuracy of the test results, greatly improving the detection efficiency and reliability.

[0026] Furthermore, in order to protect the parts of the device, specifically, a limiting opening is provided on the outer wall of the internal threaded tube 331, and a limiting block 334 is fixedly connected to the outer wall of the sliding block 33. A one-way limiting rod 335 is rotatably connected to the outer wall of the sliding block 33. The one-way limiting rod 335 and the limiting block 334 are elastically connected by an arc spring. After the circular plate 352 moves to the limiting plate 358, the connecting block 359 moves, and the circular rod 1 3511 slides in the inclined groove 3510, driving the insertion rod 333 away from the insertion hole 332, releasing the limit on the internal threaded tube 331, and the two-way screw rod 32 continues to rotate clockwise to drive the internal threaded tube 331 to rotate, and the fixed seat 351 will no longer continue to move toward the end of the pipeline to be detected, thereby preventing the fixing seat 351 from being excessively squeezed and causing damage to the parts of the compensation component 35. This design not only protects the compensation component 35, but also extends the service life of the device, while also ensuring the safety during the detection process.

[0027] Furthermore, two groups of one-way limit rods 335 are provided, and a straight slot 336 is provided on the outer wall of one group of one-way limit rods 335. The lubrication assembly 4 includes an oil tank 41, and an elastic contact switch 42 and a valve body 43 are fixedly connected to the outer wall of the oil tank 41. The oil tank 41 is connected to an oil replenishing pipe 44, and one end of the oil replenishing pipe 44 away from the oil tank 41 is connected to the inner surface of the sliding block 33. A guide block 46 is fixedly connected to the outer wall of the sliding block 33, and the guide block 46 is slidably connected to an L rod 45. The bottom of the L rod 45 is fixedly connected to a round rod 47, and the round rod 47 slides The one-way limit rod 335 is movably connected in the straight slot 336. During the rotation of the internal threaded barrel 331, the one-way limit rod 335 swings back and forth under the action of the arc spring, driving the round rod 47 to slide in the straight slot 336. The L rod 45 slides back and forth up and down under the action of the guide block 46, squeezing the elastic contact switch 42, so that the valve body 43 transports the lubricating oil in the oil tank 41 to the inner surface of the sliding block 33, reducing the friction between the rotation of the internal threaded barrel 331 and the sliding block 33, thereby improving the operation efficiency and stability of the device. This design not only reduces energy consumption, but also improves detection accuracy.

[0028] In addition, in order to facilitate the air tightness test of the pipeline to be tested, specifically, the detection component 5 includes a mounting plate 51 and a pressure gauge 54. An air pump 52 is fixedly installed on the mounting plate 51. The air pump 52 is connected to a soft air pipe 53. The soft air pipe 53 runs through the fixed seat 351. The air pump 52 is started to add gas to the pipeline to be tested, and then the pressure gauge 54 is used for detection. After the pressure gauge 54 has been testing for a period of time, if the reading has basically not changed, it indicates that the pipeline to be tested is not leaking. Otherwise, the pipeline to be tested is leaking.

[0029] The present invention provides a detection method for a pipeline gas leakage detection device, comprising the following steps: S1. First, place the pipeline to be inspected on the support seat 2, then start the output shaft of the motor 31 to rotate clockwise, driving the bidirectional screw 32 to rotate clockwise. Since the plug rod 333 is inserted into the plug hole 332, the internal threaded cylinder 331 will not rotate relative to the sliding block 33. The sliding block 33 moves in the groove of the base 1, so that the fixed seat 351 moves toward the end of the pipeline to be inspected, so as to achieve the end of the pipeline to be inspected. Blockage; S2, the circular plate 352 contacts the pipeline to be detected, the supporting protrusion 353 is inserted into the inner wall of the pipeline to be detected, and the circular plate 352 continues to move toward the end of the pipeline to be detected. The pipeline to be detected squeezes the circular plate 352, and the piston rod 355 squeezes the gas cylinder 356. The gas in the gas cylinder 356 enters the sealing airbag 354 through the soft connecting tube 357. The sealing airbag 354 expands and contacts closely with the inner wall of the pipeline to be detected, thereby achieving compensation for the sealing of both ends of the pipeline to be detected; S3, after the circular plate 352 moves to the limiting plate 358, the connecting block 359 moves, and the circular rod 1 3511 slides in the inclined groove 3510, driving the insertion rod 333 away from the insertion hole 332, releasing the limit on the internal threaded tube 331, and the bidirectional screw rod 32 continues to rotate clockwise to drive the internal threaded tube 331 to rotate, and the fixed seat 351 will no longer continue to move toward the end of the pipeline to be tested; S4. During the rotation of the internal threaded barrel 331, the one-way limit rod 335 swings back and forth under the action of the arc spring, driving the round rod 47 to slide in the straight slot 336. The L rod 45 slides back and forth up and down under the action of the guide block 46, squeezing the elastic contact switch 42, so that the valve body 43 delivers the lubricating oil in the oil tank 41 to the inner surface of the sliding block 33, reducing the friction between the rotation of the internal threaded barrel 331 and the sliding block 33. S5. Start the air pump 52 again to add gas into the pipeline to be tested, and then test it through the pressure gauge 54. After the pressure gauge 54 has tested for a period of time, if the reading does not change, it indicates that the pipeline to be tested is not leaking. Otherwise, the pipeline to be tested is leaking. After the test is completed, start the output shaft of the motor 31 to rotate counterclockwise. Due to the limitation of the one-way limiting rod 335 by the limiting block 334, the internal threaded tube 331 will not rotate relative to the sliding block 33, so that the sliding block 33 slides and resets in the groove of the base 1.

[0030] It should be noted that the above-mentioned electrical components are all existing technology products. Technical personnel in this field select, install and complete the circuit debugging work according to the needs of use to ensure that all electrical appliances can work normally. The components are all universal standard parts or components known to technical personnel in this field. Their structures and principles can be known to technical personnel through technical manuals or through conventional experimental methods, and no specific restrictions are made here.

[0031] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A pipeline gas leakage detection device, comprising a base (1), characterized in that: The upper side of the base (1) is fixedly connected to a support seat (2), the base (1) is provided with a positioning mechanism (3), the positioning mechanism (3) is provided with a lubrication component (4) and a detection component (5), and the positioning mechanism (3) comprises: A motor (31), the motor (31) being fixedly connected to the outer wall of the base (1), the inner surface of the groove of the base (1) being rotatably connected to a bidirectional screw rod (32), the motor (31) being fixedly connected to the bidirectional screw rod (32); A sliding block (33), the sliding block (33) being slidably connected in a groove of the base (1), and a support (34) being fixedly connected to the upper side of the sliding block (33); A compensation component (35), wherein the compensation component (35) is arranged on the support column (34); The compensation component (35) comprises a fixing seat (351), the fixing seat (351) being fixedly connected to the top of the pillar (34), a circular plate (352) being slidably connected to the inner wall of the fixing seat (351), a supporting protrusion (353) being fixedly connected to a side of the circular plate (352) away from the detection component (5), and a sealing airbag (354) being fixedly connected to a side of the supporting protrusion (353) away from the circular plate (352).

2. A pipeline gas leakage detection device according to claim 1, characterized in that: A piston rod (355) is fixedly connected to one side of the circular plate (352) away from the supporting protrusion (353); an air cylinder (356) is fixedly connected to the inner wall of the fixing seat (351); the piston rod (355) is connected to the piston of the air cylinder (356); the piston rod (355) and the inner wall of the air cylinder (356) are elastically connected via a return spring; and the air cylinder (356) is connected to the sealing air bag (354) via a soft connecting tube (357).

3. A pipeline gas leakage detection device according to claim 2, characterized in that: A limiting plate (358) is fixedly connected to the inner wall of the fixing seat (351), a connecting block (359) is fixedly connected to the side of the circular plate (352) away from the supporting protrusion (353), an oblique groove (3510) is provided on the outer wall of the connecting block (359), and a round rod (3511) is slidably connected in the oblique groove (3510).

4. A pipeline gas leakage detection device according to claim 3, characterized in that: An internal threaded barrel (331) is rotatably connected to the inner wall of the sliding block (33), and the internal threaded barrel (331) is threadedly connected to the bidirectional screw rod (32). An insertion hole (332) is provided on the outer wall of the internal threaded barrel (331), and an insertion rod (333) is inserted into the insertion hole (332). The top of the insertion rod (333) is penetrated by round rod one (3511) and is rotatably connected to round rod one (3511).

5. A pipeline gas leakage detection device according to claim 4, characterized in that: A limiting opening is provided on the outer wall of the internally threaded cylinder (331); a limiting block (334) is fixedly connected to the outer wall of the sliding block (33); a one-way limiting rod (335) is rotatably connected to the outer wall of the sliding block (33); the one-way limiting rod (335) is elastically connected to the limiting block (334) via an arc spring.

6. A pipeline gas leakage detection device according to claim 5, characterized in that: Two groups of the one-way limiting rods (335) are provided, and a straight notch (336) is provided on the outer wall of one group of the one-way limiting rods (335).

7. A pipeline gas leakage detection device according to claim 6, characterized in that: The lubrication assembly (4) comprises an oil tank (41), an elastic contact switch (42) and a valve body (43) being fixedly connected to the outer wall of the oil tank (41), an oil replenishing pipe (44) being connected to the oil tank (41), and an end of the oil replenishing pipe (44) away from the oil tank (41) being connected to the inner surface of the sliding block (33).

8. A pipeline gas leakage detection device according to claim 7, characterized in that: A guide block (46) is fixedly connected to the outer wall of the sliding block (33), an L-rod (45) is slidably connected to the guide block (46), a second round rod (47) is fixedly connected to the bottom of the L-rod (45), and the second round rod (47) is slidably connected to the straight slot (336).

9. A pipeline gas leakage detection device according to claim 1, characterized in that: The detection assembly (5) comprises a mounting plate (51) and a pressure gauge (54); an air pump (52) is fixedly mounted on the mounting plate (51); the air pump (52) is connected to a soft air pipe (53); and the soft air pipe (53) passes through the fixing seat (351).

10. A detection method, the detection method adopting the pipeline gas leakage detection device according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1. First, place the pipeline to be inspected on the support seat (2), then start the output shaft of the motor (31) to rotate clockwise, driving the bidirectional screw rod (32) to rotate clockwise. Since the insertion rod (333) is inserted into the insertion hole (332), the internal threaded cylinder (331) will not rotate relative to the sliding block (33). The sliding block (33) moves in the groove of the base (1), so that the fixed seat (351) moves toward the end of the pipeline to be inspected, thereby sealing the end of the pipeline to be inspected. S2, the circular plate (352) contacts the pipeline to be detected, the supporting protrusion (353) is inserted into the inner wall of the pipeline to be detected, and when the circular plate (352) continues to move toward the end of the pipeline to be detected, the pipeline to be detected squeezes the circular plate (352), the piston rod (355) squeezes the gas cylinder (356), and the gas in the gas cylinder (356) enters the sealing gas bag (354) through the soft connecting tube (357), and the sealing gas bag (354) expands and contacts closely with the inner wall of the pipeline to be detected, thereby achieving compensation for the sealing of both ends of the pipeline to be detected; S3, after the circular plate (352) moves to the limiting plate (358), the connecting block (359) moves, and the round rod (3511) slides in the inclined groove (3510), driving the insertion rod (333) away from the insertion hole (332), releasing the limit on the internal threaded tube (331), and the bidirectional screw rod (32) continues to rotate clockwise to drive the internal threaded tube (331) to rotate, and the fixed seat (351) will no longer continue to move toward the end of the pipeline to be tested; S4. During the rotation of the internal threaded barrel (331), the one-way limit rod (335) swings back and forth under the action of the arc spring, driving the second round rod (47) to slide in the straight slot (336). The L rod (45) slides back and forth up and down under the action of the guide block (46), squeezing the elastic contact switch (42), so that the valve body (43) transfers the lubricating oil in the oil tank (41) to the inner surface of the sliding block (33), thereby reducing the friction between the rotation of the internal threaded barrel (331) and the sliding block (33); S5, start the air pump (52) again, add gas to the pipeline to be tested, and then test it through the pressure gauge (54). After a period of time, if the reading of the pressure gauge (54) does not change substantially, it indicates that the pipeline to be tested is not leaking. Otherwise, the pipeline to be tested is leaking. After the test is completed, the output shaft of the start motor (31) rotates counterclockwise. Due to the limit of the one-way limit rod (335) by the limit block (334), the internal threaded cylinder (331) does not rotate relative to the sliding block (33), so that the sliding block (33) slides and resets in the groove of the base (1).

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