CN113074881A - Leakage detection device - Google Patents
Leakage detection device Download PDFInfo
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- CN113074881A CN113074881A CN202110290000.XA CN202110290000A CN113074881A CN 113074881 A CN113074881 A CN 113074881A CN 202110290000 A CN202110290000 A CN 202110290000A CN 113074881 A CN113074881 A CN 113074881A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2807—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes
- G01M3/2815—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes using pressure measurements
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- Examining Or Testing Airtightness (AREA)
Abstract
A leakage detection device relates to the field of pipeline processing, and comprises a base, a detection cover, a lower sealing piece, an upper sealing piece, a lifting plate, a transmission piece, a detection piece, an air outlet piece, an air source, a sealing assembly and a controller; the detection cover is detachably arranged on the base; the lifting plate is arranged inside the detection cover; the sealing assembly is arranged at the upper end of the lifting plate; the upper sealing piece and the lower sealing piece are opposite in position and are respectively arranged on the lifting plate and the base; the gas outlet piece and the detection piece are driven by the transmission piece and synchronously move inside and outside the pipeline during working. According to the invention, the lower sealing piece, the upper sealing piece and the sealing component are sleeved and matched, so that the stability and the air tightness of the pipeline to be detected are ensured, and the accuracy of leakage detection is further improved; the gas outlet piece and the detection piece are arranged to synchronously move inside and outside the pipeline, the distance between the gas outlet point and the detection point is short, the detection time is shortened, the leakage point is accurately captured, and the detection efficiency and effect are improved.
Description
Technical Field
The invention relates to the field of pipeline machining, in particular to a leakage detection device.
Background
In order to avoid leakage during pipeline transportation, the pipeline needs to be subjected to leakage detection, the existing leakage detection device needs to fill sufficient gas into a pipe to be detected and then detects, the consumed time is long, and the solution leaks from the pipe orifice in the detection process, so that the detection result is inaccurate.
Disclosure of Invention
Objects of the invention
In order to solve the technical problems in the background art, the invention provides a leakage detection device. According to the invention, the lower sealing piece, the upper sealing piece and the sealing component are sleeved and matched, so that the stability and the air tightness of the pipeline to be detected are ensured, and the accuracy of leakage detection is further improved; the gas outlet piece and the detection piece are arranged to synchronously move inside and outside the pipeline, the distance between the gas outlet point and the detection point is short, the detection time is shortened, the leakage point is accurately captured, and the detection efficiency and effect are improved.
(II) technical scheme
In order to solve the problems, the invention provides a leakage detection device, which comprises a base, a detection cover, a lower sealing piece, an upper sealing piece, a lifting plate, a transmission piece, a detection piece, an air outlet piece, an air source, a sealing assembly and a controller, wherein the detection cover is arranged on the base; the detection cover is detachably arranged on the base; the lifting plate is arranged inside the detection cover; the sealing assembly is arranged at the upper end of the lifting plate; the upper sealing piece and the lower sealing piece are opposite in position and are respectively arranged on the lifting plate and the base; the gas outlet piece and the detection piece are driven by the transmission piece and synchronously move inside and outside the pipeline during working; the sealing assembly comprises a first driving motor, a lead screw, a lifting frame, a rack, a first rotating shaft, an eccentric wheel, a first gear, a mounting seat, an elastic piece and a pushing piece; a lead screw driven by a first driving motor is rotatably arranged at the top end of the detection cover; the mounting base is rotatably arranged at the bottom end of the lead screw; the upper end of the elastic piece is connected with the mounting seat, and the lower end of the elastic piece is connected with the pushing piece; the first rotating shafts are rotatably arranged on the left side and the right side of the mounting seat and rotate reversely; the eccentric wheel is connected with the first rotating shafts on the two sides and is always in sliding connection with the lifting plate; the first gear key is connected with the first rotating shaft; the lifting frame is in threaded connection with a screw rod; the racks are arranged on two sides of the lifting frame, tooth surfaces of the racks on two sides are opposite, and the racks are respectively meshed with the first gears on the corresponding sides; the air outlet piece comprises an air outlet disc and an air outlet head; the air outlet head is communicated with an air source and is arranged along the circumference of the air outlet disc; the detection piece comprises a detection ring and a detector; the detection ring is arranged on the periphery of the air outlet disc; the detector is arranged on the inner ring of the detection ring.
Preferably, the pushing piece is provided with an adsorption head.
Preferably, the gas outlet disc and the detection ring are both provided with pressing blocks.
Preferably, the bottom of the lifting plate is provided with a buffering reset piece; the buffering reset piece comprises a first reset spring and a limiting plate; the limiting plate is arranged on the inner wall of the detection cover; the lifter plate is connected to first reset spring's upper end, and the limiting plate is connected to the lower extreme.
Preferably, the upper sealing piece comprises a sealing seat, an air bag and an air pump; the sealing seat is arranged at the bottom of the lifting plate; the air bag is arranged at the periphery of the seal seat and is communicated with the air pump, and a pressure sensor is arranged on the outer wall of the air bag; the lower sealing piece and the upper sealing piece have the same structure.
Preferably, the transmission part comprises a second driving motor, a second rotating shaft, a first winding roller, a second gear, a third gear, a mounting sleeve, a third rotating shaft, a fourth gear, a fifth gear, a fourth rotating shaft, a second winding roller, a first traction rope and a second traction rope; the lifting plate is provided with a mounting groove; a second rotating shaft driven by a second driving motor is rotatably arranged in the mounting groove; the first winding roller is in key connection with two ends of the second rotating shaft; the upper end of the second traction rope extends into the mounting groove and is connected with the first winding roller in a winding mode, and the lower end of the second traction rope is connected with the detection ring; the second gear is connected with the middle end of the second rotating shaft in a key mode; the mounting sleeve is arranged on the seal seat and is meshed and connected with the third gear; the upper end of the third rotating shaft is rotatably connected with the seal seat, extends into the mounting groove and is connected with the third gear key, and the lower end of the third rotating shaft is rotatably connected with the mounting sleeve and is connected with the fourth gear key; the fourth rotating shaft is rotatably arranged on the mounting sleeve, one end of the fourth rotating shaft extends into the mounting sleeve and is in key connection with the fifth gear, and the other end of the fourth rotating shaft is in key connection with the second winding roller; the fifth gear is meshed with the fourth gear; the upper end of the second traction rope is connected with the second winding roller in a winding way, and the lower end of the second traction rope is connected with the air outlet disc.
Preferably, the air outlet head comprises a vent pipe, an air outlet cylinder, a metal plate, an electromagnet, a ball and a second return spring; an air outlet cavity is arranged on the air outlet disc; the metal plate is arranged in the air outlet cavity in a sliding manner; the tail part of the air outlet cylinder is arranged on the metal plate, the head part of the air outlet cylinder extends out of the air outlet cavity, and the wall of the air outlet cylinder is provided with an air outlet hole; the ball is arranged at the head of the air outlet cylinder in a rolling way; the vent pipe is communicated with the air outlet cylinder and the air source; the electromagnet is arranged at one end of the air outlet cavity close to the ball; the second reset spring is arranged on the periphery of the air outlet cylinder, one end of the second reset spring is connected with the metal plate, and the other end of the second reset spring is connected with the cavity wall of the air outlet cavity.
Preferably, the base is provided with a sealing groove matched with the detection cover.
Preferably, the detecting member includes an airflow detector and a positioner.
The invention also provides a leakage detection method, which comprises the following detection steps:
s1, placing the pipeline to be detected on the base along the vertical direction, and sleeving a pipe orifice at the bottom end on the periphery of the lower sealing piece;
s2, pressing the detection cover to be aligned with the position of the sealing groove to cover the pipeline;
s3, the sealing component acts, the pushing piece is pushed by the elastic piece to abut against the central position of the lifting plate to enable the pushing piece to be attached to the upper end pipe orifice of the pipeline, meanwhile, the pipe orifice is sleeved on the upper sealing piece, the first driving motor drives the lead screw to rotate, the lifting frame drives the rack to move, the first gear drives the first rotating shaft to rotate in the reverse direction, and the eccentric wheel pushes the lifting plate to enable the lifting plate to press the pipeline;
s4, starting an upper sealing piece, blowing the air bag by the air pump, attaching the air bag to the pipe wall until the reading of the pressure sensor reaches a set value, sealing an upper pipe orifice, starting a lower sealing piece in the same way, and sealing a lower pipe orifice;
s5, electrifying the electromagnet in the air outlet piece to adsorb the metal plate, so that the air outlet cylinder extends out of the air outlet cavity, and the ball contacts the inner wall of the pipeline;
s6, starting the transmission piece, and synchronously paying off the first winding roller and the second winding roller to enable the detection ring and the air outlet disc to synchronously move, wherein the air outlet point is close to the detection point;
s7, the air source supplies air to the air outlet cylinder, the detection air flows out of the air outlet hole, the detection piece detects the external air flow, and the leakage position point information is obtained.
The technical scheme of the invention has the following beneficial technical effects:
firstly, the pipeline is preliminarily positioned by sleeving the lower sealing piece and the upper sealing piece, then the pushing piece is propped against the central position of the lifting plate under the action of the sealing assembly, the eccentric wheel pushes two sides of the lifting plate, so that the lifting plate presses the pipeline, finally, the air bag is utilized for inflating, and the pipe opening is sealed, so that the stability and the air tightness of the pipeline to be detected are ensured, and the accuracy of leakage detection is further improved;
the gas outlet piece and the detection piece move synchronously inside and outside the pipeline, the distance between the gas outlet point and the detection point is short, the detection time is shortened, the leakage point is accurately captured, and the detection efficiency and effect are improved;
the air outlet cylinder is provided with the air outlet head, the position of the air outlet cylinder is adjusted through the matching of the electromagnet, the metal plate and the second return spring, the air outlet cylinder is exposed out of the installation cavity in a working state, the ball slides along the inner wall of the pipeline, the air outlet hole is close to the pipe wall, leakage detection is accelerated, the air outlet cylinder is received in the installation cavity in a non-working state, the air outlet hole is protected, and dust are prevented;
the leakage detection method is simple to operate, high in detection efficiency, capable of positioning the leakage point and good in detection effect.
Drawings
Fig. 1 is a cross-sectional view of a leak detection apparatus according to the present invention.
Fig. 2 is a schematic structural diagram of a sealing assembly in a leak detection apparatus according to the present invention.
Fig. 3 is a transverse cross-sectional view of a seal assembly in a leak detection apparatus according to the present invention.
Fig. 4 is a schematic structural diagram of a transmission member in a leak detection apparatus according to the present invention.
Fig. 5 is an enlarged schematic view of a position a of the leak detection apparatus according to the present invention.
Fig. 6 is a top view of a base in a leak detection apparatus according to the present invention.
Fig. 7 is a cross-sectional view at B in a leak detection apparatus according to the present invention.
The attached drawings are marked as follows: 1. a base; 2. a detection cover; 3. a lower closure member; 4. an upper sealing member; 5. a lifting plate; 6. a transmission member; 7. a detection member; 8. an air outlet member; 9. a gas source; 10. a seal assembly; 11. a controller; 12. a first drive motor; 13. a lead screw; 14. a lifting frame; 15. a rack; 16. a first rotating shaft; 17. an eccentric wheel; 18. a first gear; 19. a mounting seat; 20. an elastic member; 21. a pusher member; 22. a first winding roller; 23. a second gear; 24. a third gear; 25. mounting grooves; 26. installing a sleeve; 27. a third rotating shaft; 28. a fourth gear; 29. a fifth gear; 30. a fourth rotating shaft; 31. a second winding roller; 32. a first pull cord; 33. an air outlet disc; 34. an air outlet head; 35. a second pull cord; 36. a detection ring; 37. a detector; 38. a seal seat; 39. an air bag; 40. a breather pipe; 41. an air outlet cylinder; 42. a metal plate; 43. an electromagnet; 44. a ball bearing; 45. an air outlet; 46. a second return spring; 47. a first return spring; 48. a limiting plate; 49. a sealing groove; 50. a second drive motor; 51. a second rotating shaft; 52. and an air outlet cavity.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
Example 1
As shown in fig. 1-6, the leakage detecting apparatus provided by the present invention includes a base 1, a detecting cover 2, a lower sealing member 3, an upper sealing member 4, a lifting plate 5, a transmission member 6, a detecting member 7, an air outlet member 8, an air source 9, a sealing assembly 10, and a controller 11; the detection cover 2 is detachably arranged on the base 1; the lifting plate 5 is arranged inside the detection cover 2; the sealing assembly 10 is arranged at the upper end of the lifting plate 5; the upper sealing piece 4 and the lower sealing piece 3 are opposite in position and are respectively arranged on the lifting plate 5 and the base 1; the gas outlet piece 8 and the detection piece 7 are driven by the transmission piece 6 and synchronously move inside and outside the pipeline during working; the sealing assembly 10 comprises a first driving motor 12, a lead screw 13, a lifting frame 14, a rack 15, a first rotating shaft 16, an eccentric wheel 17, a first gear 18, a mounting seat 19, an elastic piece 20 and a pushing piece 21; a lead screw 13 driven by a first driving motor 12 is rotationally arranged at the top end of the detection cover 2; the mounting seat 19 is rotatably arranged at the bottom end of the screw rod 13; the upper end of the elastic piece 20 is connected with the mounting seat 19, and the lower end is connected with the pushing piece 21; the first rotating shafts 16 are rotatably arranged at the left side and the right side of the mounting seat 19, and the rotation directions are opposite; the eccentric wheel 17 is connected with the first rotating shafts 16 at two sides in a key way and is always in sliding connection with the lifting plate 5; a first gear 18 is keyed to the first rotation shaft 16; the lifting frame 14 is in threaded connection with a screw rod 13; the racks 15 are arranged on two sides of the lifting frame 14, the tooth surfaces of the racks 15 on the two sides are opposite, and the racks 15 are respectively meshed with the first gears 18 on the corresponding sides; the air outlet part 8 comprises an air outlet disc 33 and an air outlet head 34; the gas outlet head 34 is communicated with the gas source 9 and is arranged along the circumference of the gas outlet disc 33; the detecting member 7 includes a detecting ring 36 and a detector 37; the detection ring 36 is arranged on the periphery of the air outlet disc 33; the detector 37 is disposed on the inner ring of the detection ring 36.
In an alternative embodiment, the pusher 21 is provided with a suction head.
In an alternative embodiment, the gas outlet disc 33 and the detection ring 36 are provided with pressure blocks.
In an alternative embodiment, the bottom of the lifting plate 5 is provided with a buffering reset piece; the buffering return piece comprises a first return spring 47 and a limit plate 48; the limiting plate 48 is arranged on the inner wall of the detection cover 2; the upper end of the first return spring 47 is connected with the lifting plate 5, and the lower end is connected with the limiting plate 48.
In an alternative embodiment, the upper closure 4 comprises a closure seat 38, an air bladder 39 and an air pump; the seal seat 38 is arranged at the bottom of the lifting plate 5; the air bag 39 is arranged at the periphery of the sealing seat 38 and is communicated with the air pump, and a pressure sensor is arranged on the outer wall of the air bag 39; the lower closure 3 is of the same construction as the upper closure 4.
In an alternative embodiment, the transmission member 6 includes a second driving motor 50, a second rotating shaft 51, a first winding roller 22, a second gear 23, a third gear 24, a mounting sleeve 26, a third rotating shaft 27, a fourth gear 28, a fifth gear 29, a fourth rotating shaft 30, a second winding roller 31, a first traction rope 32 and a second traction rope 35; the lifting plate 5 is provided with a mounting groove 25; a second rotating shaft 51 driven by a second driving motor 50 is rotatably disposed in the mounting groove 25; the first winding roller 22 is keyed to both ends of the second rotating shaft 51; the upper end of the second traction rope 35 extends into the mounting groove 25 and is connected with the first winding roller 22 in a winding mode, and the lower end of the second traction rope is connected with the detection ring 36; the second gear 23 is keyed to the middle end of the second rotating shaft 51; the mounting sleeve 26 is arranged on the seal seat 38 and is meshed with the third gear 24; the upper end of the third rotating shaft 27 is rotatably connected with the seal seat 38, extends into the mounting groove 25 and is in key connection with the third gear 24, and the lower end of the third rotating shaft is rotatably connected with the mounting sleeve 26 and is in key connection with the fourth gear 28; the fourth rotating shaft 30 is rotatably arranged on the mounting sleeve 26, one end of the fourth rotating shaft extends into the mounting sleeve 26 and is in key connection with the fifth gear 29, and the other end of the fourth rotating shaft is in key connection with the second winding roller 31; the fifth gear 29 is meshed with the fourth gear 28; the upper end of the second traction rope 35 is connected with the second winding roller 31 in a winding way, and the lower end is connected with the air outlet disc 33.
In an alternative embodiment, the base 1 is provided with a sealing groove 49 for matching with the detection cover 2.
In an alternative embodiment, the detecting member 7 comprises an airflow detector and a positioner.
According to the device, the lower sealing piece 3 and the upper sealing piece 4 are sleeved to preliminarily position the pipeline, then the pushing piece 21 is abutted to the central position of the lifting plate 5 under the action of the sealing assembly 10, the eccentric wheel 17 pushes the two sides of the lifting plate 5, so that the lifting plate 5 presses the pipeline, finally the air bag 39 is utilized to inflate the pipeline to seal the pipe opening, the stability and the air tightness of the pipeline to be detected are ensured, and the accuracy of leakage detection is improved; the gas outlet piece 8 and the detection piece 7 are arranged to synchronously move inside and outside the pipeline, the distance between the gas outlet point and the detection point is short, the detection time is shortened, the leakage point is accurately captured, and the detection efficiency and effect are improved.
Example 2
As shown in fig. 7, the outlet head 34 includes a vent pipe 40, an outlet cylinder 41, a metal plate 42, an electromagnet 43, a ball 44, and a second return spring 46; the air outlet disc 33 is provided with an air outlet cavity 52; the metal plate 42 is arranged in the air outlet cavity 52 in a sliding way; the tail part of the air outlet cylinder 41 is arranged on the metal plate 42, the head part of the air outlet cylinder extends out of the air outlet cavity 52, and the wall of the air outlet cylinder 41 is provided with an air outlet hole 45; the ball 44 is arranged at the head of the air outlet cylinder 41 in a rolling way; the vent pipe 40 is communicated with the air outlet cylinder 41 and the air source 9; the electromagnet 43 is arranged at one end of the air outlet cavity 52 close to the ball 44; the second return spring 46 is arranged on the periphery of the air outlet cylinder 41, and one end of the second return spring is connected with the metal plate 42, and the other end of the second return spring is connected with the cavity wall of the air outlet cavity 52.
The invention is provided with the air outlet head 34, the position of the air outlet cylinder 41 is adjusted through the matching of the electromagnet 43, the metal plate 42 and the second return spring 46, the air outlet cylinder 41 is exposed out of the mounting cavity 52 in a working state, the ball 44 slides along the inner wall of the pipeline, the air outlet hole 45 is close to the pipe wall to accelerate leakage detection, and the air outlet cylinder 41 is received in the mounting cavity 52 in a non-working state to protect the air outlet hole 45, prevent dust and prevent dust.
Example 3
The invention also provides a leakage detection method, which comprises the following detection steps:
s1, placing the pipeline to be detected on the base 1 along the vertical direction, and sleeving a pipe orifice at the bottom end on the periphery of the lower sealing member 3;
s2, the detection cover 2 is pressed downwards to align with the position of the sealing groove 49, and the pipeline is covered;
s3, the sealing assembly 10 acts, the pushing piece 21 is pushed by the elastic piece 20 to abut against the central position of the lifting plate 5, so that the pushing piece is attached to the upper end pipe orifice of the pipeline, meanwhile, the upper sealing piece 4 is sleeved on the pipe orifice, the first driving motor 12 drives the screw rod 13 to rotate, the lifting frame 14 drives the rack 15 to move, the first gear 18 drives the first rotating shaft 16 to rotate in the reverse direction, and the eccentric wheel 17 pushes the lifting plate 5 to press the pipeline;
s4, starting the upper sealing piece 4, blowing the air bag 39 by the air pump, attaching the air bag 39 to the pipe wall until the reading of the pressure sensor reaches a set value, sealing the upper pipe orifice, starting the lower sealing piece 3 in the same way, and sealing the lower pipe orifice;
s5, electrifying the electromagnet 43 in the air outlet piece 8, adsorbing the metal plate 42, extending the air outlet cylinder 41 out of the air outlet cavity 52, and contacting the ball 44 with the inner wall of the pipeline;
s6, starting the transmission piece 6, and synchronously paying off the first winding roller 22 and the second winding roller 31 to enable the detection ring 36 and the air outlet disc 33 to synchronously move, wherein the air outlet point is close to the detection point;
s7, the gas source 9 supplies gas to the gas outlet cylinder 41, the detection gas flows out from the gas outlet hole 45, the detector 7 detects the external gas flow, and acquires the information of the position point of the leakage.
The leakage detection method is simple to operate, high in detection efficiency, capable of positioning the leakage point and good in detection effect.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (10)
1. A leakage detection device is characterized by comprising a base (1), a detection cover (2), a lower sealing piece (3), an upper sealing piece (4), a lifting plate (5), a transmission piece (6), a detection piece (7), an air outlet piece (8), an air source (9), a sealing assembly (10) and a controller (11); the detection cover (2) is detachably arranged on the base (1); the lifting plate (5) is arranged inside the detection cover (2); the sealing component (10) is arranged at the upper end of the lifting plate (5); the upper sealing piece (4) and the lower sealing piece (3) are opposite in position and are respectively arranged on the lifting plate (5) and the base (1); the gas outlet piece (8) and the detection piece (7) are driven by the transmission piece (6) and synchronously move inside and outside the pipeline during working;
the sealing assembly (10) comprises a first driving motor (12), a lead screw (13), a lifting frame (14), a rack (15), a first rotating shaft (16), an eccentric wheel (17), a first gear (18), a mounting seat (19), an elastic piece (20) and a pushing piece (21); a lead screw (13) driven by a first driving motor (12) is rotatably arranged at the top end of the detection cover (2); the mounting seat (19) is rotatably arranged at the bottom end of the screw rod (13); the upper end of the elastic piece (20) is connected with the mounting seat (19), and the lower end is connected with the pushing piece (21); the first rotating shafts (16) are rotatably arranged on the left side and the right side of the mounting seat (19) and rotate reversely; the eccentric wheel (17) is connected with the first rotating shafts (16) at two sides in a key way and is always connected with the lifting plate (5) in a sliding way; a first gear (18) is keyed to the first rotation shaft (16); the lifting frame (14) is in threaded connection with a screw rod (13); the racks (15) are arranged on two sides of the lifting frame (14), the tooth surfaces of the racks (15) on the two sides are opposite, and are respectively meshed with the first gears (18) on the corresponding sides;
the air outlet piece (8) comprises an air outlet disc (33) and an air outlet head (34); the air outlet head (34) is communicated with the air source (9) and is arranged along the circumference of the air outlet disc (33);
the detection piece (7) comprises a detection ring (36) and a detector (37); the detection ring (36) is arranged on the periphery of the air outlet disc (33); the detector (37) is arranged on the inner ring of the detection ring (36).
2. A leak detecting device according to claim 1, characterized in that the urging member (21) is provided with a suction head.
3. A leak detecting arrangement according to claim 1, characterized in that the gas outlet disc (33) and the detecting ring (36) are provided with pressure blocks.
4. A leak detecting device according to claim 1, characterized in that the bottom of the lifting plate (5) is provided with a buffer reset; the buffering reset piece comprises a first reset spring (47) and a limiting plate (48); the limiting plate (48) is arranged on the inner wall of the detection cover (2); the upper end of the first return spring (47) is connected with the lifting plate (5), and the lower end is connected with the limiting plate (48).
5. A leak detecting device according to claim 1, characterized in that the upper closure member (4) comprises a closure seat (38), an air bag (39) and an air pump; the sealing seat (38) is arranged at the bottom of the lifting plate (5); the air bag (39) is arranged at the periphery of the seal seat (38) and is communicated with the air pump, and a pressure sensor is arranged on the outer wall of the air bag (39); the lower sealing piece (3) and the upper sealing piece (4) have the same structure.
6. A leak detecting device according to claim 1, characterized in that the transmission member (6) comprises a second drive motor (50), a second rotary shaft (51), a first winding roller (22), a second gear (23), a third gear (24), a mounting sleeve (26), a third rotary shaft (27), a fourth gear (28), a fifth gear (29), a fourth rotary shaft (30), a second winding roller (31), a first pull cord (32) and a second pull cord (35); the lifting plate (5) is provided with a mounting groove (25); a second rotating shaft (51) driven by a second driving motor (50) is rotatably arranged in the mounting groove (25); the first winding roller (22) is connected with two ends of the second rotating shaft (51) in a key mode; the upper end of a second traction rope (35) extends into the mounting groove (25) and is connected with the first winding roller (22) in a winding mode, and the lower end of the second traction rope is connected with a detection ring (36); the second gear (23) is in key connection with the middle end of the second rotating shaft (51); the mounting sleeve (26) is arranged on the seal seat (38) and is meshed with the third gear (24); the upper end of the third rotating shaft (27) is rotatably connected with the seal seat (38) and extends into the mounting groove (25) to be connected with the third gear (24) in a key mode, and the lower end of the third rotating shaft is rotatably connected with the mounting sleeve (26) to be connected with the fourth gear (28) in a key mode; the fourth rotating shaft (30) is rotatably arranged on the mounting sleeve (26), one end of the fourth rotating shaft extends into the mounting sleeve (26) and is in key connection with the fifth gear (29), and the other end of the fourth rotating shaft is in key connection with the second winding roller (31); the fifth gear (29) is meshed with the fourth gear (28); the upper end of the second traction rope (35) is connected with the second winding roller (31) in a winding way, and the lower end of the second traction rope is connected with the air outlet disc (33).
7. A leak detecting apparatus according to claim 1, wherein the gas outlet head (34) includes a gas vent pipe (40), a gas outlet cylinder (41), a metal plate (42), an electromagnet (43), a ball (44), and a second return spring (46); an air outlet cavity (52) is arranged on the air outlet disc (33); the metal plate (42) is arranged in the air outlet cavity (52) in a sliding way; the tail part of the air outlet cylinder (41) is arranged on the metal plate (42), the head part of the air outlet cylinder extends out of the air outlet cavity (52), and the wall of the air outlet cylinder (41) is provided with an air outlet hole (45); the ball (44) is arranged at the head part of the air outlet cylinder (41) in a rolling way; the vent pipe (40) is communicated with the air outlet cylinder (41) and the air source (9); the electromagnet (43) is arranged at one end of the air outlet cavity (52) close to the ball (44); the second return spring (46) is arranged on the periphery of the air outlet cylinder (41), one end of the second return spring is connected with the metal plate (42), and the other end of the second return spring is connected with the cavity wall of the air outlet cavity (52).
8. A leak detector as claimed in claim 1, characterized in that the base (1) is provided with a sealing groove (49) which cooperates with the detection cap (2).
9. A leak detection device according to claim 1, characterized in that the detection member (7) comprises an airflow detector and a positioner.
10. A leak detection method comprising any one of claims 1 to 9, wherein the detecting step is as follows:
s1, placing the pipeline to be detected on the base (1) along the vertical direction, and sleeving a pipe orifice at the bottom end on the periphery of the lower sealing piece (3);
s2, the detection cover (2) is pressed downwards to be aligned to the position of the sealing groove (49) to cover the pipeline;
s3, the sealing assembly (10) acts, the pushing piece (21) is pushed by the elastic piece (20) to abut against the central position of the lifting plate (5) to enable the pushing piece to be attached to a pipe orifice at the upper end of the pipeline, meanwhile, the pipe orifice is sleeved on the upper sealing piece (4), the first driving motor (12) drives the screw rod (13) to rotate, the lifting frame (14) drives the rack (15) to move, the first gear (18) drives the first rotating shaft (16) to rotate in the reverse direction, and the eccentric wheel (17) pushes the lifting plate (5) to enable the lifting plate to press the pipeline;
s4, starting the upper sealing piece (4), blowing the air bag (39) by the air pump, attaching the air bag (39) to the pipe wall until the reading of the pressure sensor reaches a set value, sealing the upper pipe orifice, starting the lower sealing piece (3) in the same way, and sealing the lower pipe orifice;
s5, electrifying an electromagnet (43) in the air outlet piece (8) to adsorb the metal plate (42), so that the air outlet cylinder (41) extends out of the air outlet cavity (52), and the ball (44) contacts the inner wall of the pipeline;
s6, starting the transmission piece (6), and synchronously paying off the first winding roller (22) and the second winding roller (31) to enable the detection ring (36) and the air outlet disc (33) to synchronously move, wherein the air outlet point is close to the detection point;
s7, the air source (9) supplies air to the air outlet cylinder (41), the detection gas flows out from the air outlet hole (45), the detection piece (7) detects the external air flow, and the position point information of leakage is obtained.
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