A pressure differential air tightness detection device for steel cylinders

Abstract

The invention discloses a pressure differential air tightness detection device for a steel cylinder, which relates to the technical field of air tightness detection, comprising a bottom plate, the top end of the bottom plate is fixedly connected to a sealing box, the top end of the sealing box is fixedly connected to a pressurizing device, both ends of the top of the sealing box are fixedly connected to a top plate, one end of the top plate is flush with the end of the sealing box and is rotatably connected to a rotating plate, one end of the rotating plate away from the top plate is fixedly connected to an end seat, the rotating plate is slidably connected to a moving seat, both ends of the moving seat are fixedly connected to connecting rods, and a sealing head is fixedly connected between the two connecting rods. The invention can extract the air inside the bottle body to form a negative pressure state by arranging an air extraction pump and a sealing head, and apply high air pressure to the outside of the bottle body by arranging a pressurizing device, so that a high pressure difference is formed between the inside and outside of the bottle body, and the high pressure difference is used to realize the air tightness detection of the bottle body, and at the same time, the leakage point area of ​​the bottle body can be detected by the sealing device, and the air tightness detection effect of the bottle body is good.

Description

Technical Field

[0001] The invention relates to the technical field of air tightness detection, in particular to a steel cylinder pressure differential type air tightness detection device. Background Art

[0002] For steel cylinders used to store high-pressure gases, there are high requirements for their air tightness, so they need to be tested for air tightness after production.

[0003] As for the air tightness detection of steel cylinders, inflating the cylinder to generate high pressure or extracting the gas in the cylinder to make it negative pressure is one of the means to detect the air tightness of the cylinder. By monitoring the pressure change in the cylinder, it is determined whether the cylinder is leaking. However, it is difficult to determine the approximate leakage area of ​​the cylinder. There are certain shortcomings and further improvements are needed. Summary of the invention

[0004] The present invention provides a pressure differential type air tightness detection device for a steel cylinder, which solves the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A pressure differential air tightness detection device for a steel cylinder comprises a bottom plate, the top of the bottom plate is fixedly connected to a sealing box, the top of the sealing box is fixedly connected to a pressurizing device, both ends of the top of the sealing box are fixedly connected to a top plate, one end of the top plate is flush with the end of the sealing box and is rotatably connected to a rotating plate, one end of the rotating plate away from the top plate is fixedly connected to an end seat, the rotating plate is slidably connected to a moving seat, both ends of the moving seat are fixedly connected to connecting rods, a plugging head is fixedly connected between the two connecting rods, a first translation mechanism for driving the moving seat to move is provided on the end seat, the plugging head is connected to an exhaust assembly, and a pressure gauge is fixedly provided on the outside of the sealing box;

[0007] The top and bottom ends of the sealing box are fixedly connected to a fixed mounting seat, and the adjacent sides of the two fixed mounting seats are slidably connected to a movable mounting seat. A second translation mechanism for driving the movable mounting seat to move is provided in the fixed mounting seat, and a side of the movable mounting seat away from the fixed mounting seat is fixedly connected to a first compression spring, and an end of the first compression spring away from the movable mounting seat is fixedly connected to an arc-shaped jacket, a bottle body is provided between the two arc-shaped jackets, a plurality of through grooves are provided on the arc-shaped jacket, and a sealing device is provided in the through grooves.

[0008] As a preferred technical solution of the present invention, the first translation mechanism includes a first shift motor fixedly arranged on the end seat, the output of the first shift motor is coaxially fixedly connected to the first shift screw, the first shift screw passes through the moving seat and is threadedly connected thereto, and the end seat is also fixedly connected with a guide rod arranged parallel to the first shift screw, the guide rod passes through the moving seat and is slidably connected thereto.

[0009] As a preferred technical solution of the present invention, the vacuum assembly includes a vacuum pipe fixedly arranged at the end of the sealing head, a vacuum pump is fixedly connected to the movable seat, and the input end of the vacuum pump is fixedly connected to the vacuum pipe.

[0010] As a preferred technical solution of the present invention, the pressurizing device is an air compressor.

[0011] As a preferred technical solution of the present invention, the sealing device includes a hydraulic telescopic rod fixedly arranged on a movable mounting seat, the telescopic end of the hydraulic telescopic rod extends into the through groove and is fixedly connected to a pressing sleeve, and a first sealing sleeve is fixedly arranged at one end of the pressing sleeve away from the hydraulic telescopic rod.

[0012] As a preferred technical solution of the present invention, an end frame is fixedly connected between one ends of the two fixed mounting seats, the end frame is fixedly connected to the end clamping piece on the side close to the bottle body, an end slot is opened on the side of the sealing head close to the bottle body, a sealing gasket is fixedly installed in the end slot, and a gas channel is opened in the sealing head, and the gas channel is connected to the end slot and the exhaust pipe.

[0013] As a preferred technical solution of the present invention, the end clamping piece includes an outer sleeve seat, which is fixedly connected to the end frame, a second clamping spring is fixedly connected inside the outer sleeve seat, the second clamping spring is fixedly connected to the clamping seat, and a second sealing sleeve is fixedly provided on the outside of the sealing head.

[0014] As a preferred technical solution of the present invention, the second translation mechanism includes a second shift motor fixedly arranged at one end of the fixed mounting seat, the output shaft of the second shift motor is coaxially fixedly connected to the second shift screw, the fixed mounting seat is slidingly connected to the shift block, the second shift screw passes through the shift block and is threadedly connected thereto, the arc-shaped outer sleeve is fixedly connected to the shift guide rod, the shift guide rod passes through the movable mounting seat and is fixedly connected to the shift block.

[0015] As a preferred technical solution of the present invention, the top of the rotating plate is fixedly connected to a handle, and the top and bottom ends of the rotating plate close to one end of the top plate are respectively fixedly connected to an upper limit stopper and a lower limit stopper.

[0016] As a preferred technical solution of the present invention, the first sealing sleeve, the second sealing sleeve and the sealing gasket are all made of silicone.

[0017] The present invention has the following advantages: the present invention can extract the air inside the bottle body to form a negative pressure state by arranging an air pump and a sealing head, and apply high air pressure to the outside of the bottle body by arranging a pressurizing device, so as to form a high pressure difference between the inside and outside of the bottle body, and utilize the high pressure difference to realize the sealing detection of the bottle body. At the same time, the sealing device can also be used to detect the leakage point area of ​​the bottle body, and the airtightness detection effect of the bottle body is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a cylinder pressure differential air tightness detection device.

[0019] Figure 2 It is a schematic diagram of the three-dimensional structure of a cylinder pressure differential air tightness detection device.

[0020] Figure 3 It is a schematic diagram of the structure inside the sealing box in the cylinder pressure differential air tightness detection device.

[0021] Figure 4 It is a schematic diagram of the structure of the arc-shaped outer jacket in the cylinder pressure differential air tightness detection device.

[0022] Figure 5 It is a schematic diagram of the structure of the sealing device in the cylinder pressure differential air tightness detection device.

[0023] Figure 6 It is a structural schematic diagram of the second translation mechanism in the cylinder pressure differential air tightness detection device.

[0024] Figure 7 It is a schematic diagram of the structure of the plugging head in the cylinder pressure differential air tightness detection device.

[0025] In the figure: 1, bottom plate; 2, sealing box; 3, pressurizing device; 4, top plate; 5, rotating plate; 6, moving seat; 7, connecting rod; 8, plugging head; 9, end seat; 10, first shift motor; 11, first shift screw; 12, guide rod; 13, vacuum pump; 14, vacuum pipe; 15, upper limit stopper; 16, lower limit stopper; 17, handle; 18, arc-shaped outer sleeve; 19, through groove; 20, ball; 21, first pressing Spring; 22. movable mounting seat; 23. hydraulic telescopic rod; 24. sealing device; 25. bottle body; 26. pressing sleeve; 27. first sealing sleeve; 28. shifting guide rod; 29. ​​fixed mounting seat; 30. second shifting motor; 31. shifting block; 32. second shifting screw; 33. end slot; 34. sealing pad; 35. gas channel; 36. second sealing sleeve; 37. end frame; 38. end clamping piece; 39. barometer. DETAILED DESCRIPTION

[0026] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0027] It should be noted that the directions or positional relationships indicated by terms such as “center”, “up”, “down”, “left”, “right”, “vertical”, “horizontal”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present invention.

[0028] See also Figure 1-7 A pressure differential air tightness detection device for a steel cylinder comprises a bottom plate 1, the top of the bottom plate 1 is fixedly connected to a sealing box 2, the top of the sealing box 2 is fixedly connected to a pressurizing device 3, both ends of the top of the sealing box 2 are fixedly connected to a top plate 4, one end of the top plate 4 is flush with the end of the sealing box 2 and is rotatably connected to a rotating plate 5, one end of the rotating plate 5 away from the top plate 4 is fixedly connected to an end seat 9, the rotating plate 5 is slidably connected to a moving seat 6, both ends of the moving seat 6 are fixedly connected to connecting rods 7, a sealing head 8 is fixedly connected between the two connecting rods 7, a first translation mechanism for driving the moving seat 6 to move is provided on the end seat 9, the sealing head 8 is connected to a vacuum assembly, and a barometer 39 is fixedly provided on the outside of the sealing box 2; the barometer 39 is used to display the air pressure value in the sealing box 2.

[0029] The top and bottom ends of the sealed box 2 are fixedly connected to fixed mounting seats 29, and the adjacent sides of the two fixed mounting seats 29 are slidably connected to mobile mounting seats 22. A second translation mechanism for driving the mobile mounting seat 22 to move is provided in the fixed mounting seat 29. The side of the mobile mounting seat 22 away from the fixed mounting seat 29 is fixedly connected to the first compression spring 21, and the end of the first compression spring 21 away from the mobile mounting seat 22 is fixedly connected to the arc-shaped outer sleeve 18. A bottle body 25 is provided between the two arc-shaped outer sleeves 18. A plurality of through grooves 19 are provided on the arc-shaped outer sleeve 18, and a sealing device 24 is provided in the through grooves 19. A ball 20 is rotatably connected to the inner side of the arc-shaped outer sleeve 18 between each two adjacent through grooves 19.

[0030] The first translation mechanism includes a first shift motor 10 fixedly arranged on the end seat 9, the output of the first shift motor 10 is coaxially fixedly connected to the first shift screw 11, the first shift screw 11 passes through the moving seat 6 and is threadedly connected thereto, and a guide rod 12 arranged parallel to the first shift screw 11 is also fixedly connected to the end seat 9, the guide rod 12 passes through the moving seat 6 and is slidably connected thereto.

[0031] The air extraction component includes an air extraction pipe 14 fixedly arranged at the end of the plugging head 8 , and an air extraction pump 13 is fixedly connected to the movable seat 6 , and the input end of the air extraction pump 13 is fixedly connected to the air extraction pipe 14 .

[0032] The pressurizing device 3 is an air compressor.

[0033] The sealing device 24 includes a hydraulic telescopic rod 23 fixedly mounted on the movable mounting seat 22 . The telescopic end of the hydraulic telescopic rod 23 extends into the through slot 19 and is fixedly connected to a pressing sleeve 26 . A first sealing sleeve 27 is fixedly mounted on one end of the pressing sleeve 26 away from the hydraulic telescopic rod 23 .

[0034] An end frame 37 is fixedly connected between one ends of the two fixed mounting seats 29, and an end clamping piece 38 is fixedly connected to the side of the end frame 37 close to the bottle body 25. An end slot 33 is provided on the side of the sealing head 8 close to the bottle body 25, and a sealing gasket 34 is fixedly provided in the end slot 33. A gas channel 35 is provided in the sealing head 8, and the gas channel 35 is connected to the end slot 33 and the exhaust pipe 14.

[0035] The end clamping member 38 includes an outer sleeve seat, which is fixedly connected to the end frame 37 , a second clamping spring is fixedly connected inside the outer sleeve seat, and the second clamping spring is fixedly connected to the clamping seat. A second sealing sleeve 36 is fixedly provided outside the plugging head 8 .

[0036] The second translation mechanism includes a second shift motor 30 fixedly arranged at one end of the fixed mounting seat 29, the output shaft of the second shift motor 30 is coaxially fixedly connected to the second shift screw 32, the fixed mounting seat 29 is slidably connected to the shift block 31, the second shift screw 32 passes through the shift block 31 and is threadedly connected thereto, the arc sleeve 18 is fixedly connected to the shift guide rod 28, the shift guide rod 28 passes through the movable mounting seat 22 and is fixedly connected to the shift block 31.

[0037] The top of the rotating plate 5 is fixedly connected to a handle 17 , and the top and bottom ends of the rotating plate 5 close to one end of the top plate 4 are fixedly connected to an upper limit stopper 15 and a lower limit stopper 16 respectively.

[0038] The first sealing sleeve 27 , the second sealing sleeve 36 and the sealing gasket 34 are all made of silicone.

[0039] During the implementation of the present invention, the bottle body 25 is first placed in the sealed box 2, and the bottle body 25 is clamped by two arc-shaped sleeves 18. Then the rotating plate 5 is rotated to make it horizontal. At this time, the sealing head 8 is located on the bottle mouth side of the bottle body 25. Then the first shift motor 10 is started to drive the sealing head 8 to move to seal the bottle mouth of the bottle body 25. Then the vacuum pump 13 is started to extract the air inside the bottle body 25 to make it in a negative pressure state. Then the pressurizing device 3 is started to pressurize the sealed box 2, and the air pressure inside the sealed box 2 is monitored using the barometer 39.

[0040] If the air pressure in the sealed box 2 remains unchanged within a unit time, it is proved that the bottle body 25 is leak-proof.

[0041] If the air pressure in the sealed box 2 gradually decreases, it indicates that the bottle 25 is leaking. Then the hydraulic telescopic rods 23 on the two movable mounting seats 22 are controlled to extend at once to drive the first sealing sleeve 27 to press the outside of the bottle 25, and then the air pressure changes in the sealed box 2 are continuously observed. There are two situations here:

[0042] The first is that the air pressure in the sealing box 2 continues to decrease at the original speed, and the leak point is not in the area compressed by the first sealing sleeve 27. At this time, it is necessary to replace another set of hydraulic telescopic rods 23 to extend for detection, and cooperate with the movement of the mobile mounting seat 22 to implement multi-area compression;

[0043] The second is that the air pressure in the sealing box 2 remains unchanged within a unit time after the first sealing sleeve 27 presses the outside of the bottle body 25, indicating that the leakage location is at the contact point between the first sealing sleeve 27 and the bottle body 25. The leakage area of ​​the bottle body 25 can be roughly selected to facilitate repairing the bottle body 25.

[0044] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent replacements for some of the technical features therein.

Claims

1. A pressure differential air tightness detection device for a steel cylinder, comprising a bottom plate (1), characterized in that: The top of the bottom plate (1) is fixedly connected to the sealing box (2), the top of the sealing box (2) is fixedly connected to the pressurizing device (3), both ends of the top of the sealing box (2) are fixedly connected to the top plate (4), one end of the top plate (4) is flush with the end of the sealing box (2) and is rotatably connected to the rotating plate (5), one end of the rotating plate (5) away from the top plate (4) is fixedly connected to the end seat (9), the rotating plate (5) is slidably connected to the moving seat (6), both ends of the moving seat (6) are fixedly connected to connecting rods (7), a sealing head (8) is fixedly connected between the two connecting rods (7), a first translation mechanism for driving the moving seat (6) to move is provided on the end seat (9), the sealing head (8) is connected to the exhaust assembly, and a pressure gauge (39) is fixedly provided on the outside of the sealing box (2); The top and bottom ends of the sealed box (2) are fixedly connected to fixed mounting seats (29), the adjacent sides of the two fixed mounting seats (29) are slidably connected to movable mounting seats (22), a second translation mechanism for driving the movable mounting seat (22) to move is provided in the fixed mounting seat (29), a side of the movable mounting seat (22) away from the fixed mounting seat (29) is fixedly connected to a first compression spring (21), an end of the first compression spring (21) away from the movable mounting seat (22) is fixedly connected to an arc-shaped outer sleeve (18), a bottle body (25) is provided between the two arc-shaped outer sleeves (18), a plurality of through grooves (19) are provided on the arc-shaped outer sleeve (18), and a sealing device (24) is provided in the through groove (19); The sealing device (24) comprises a hydraulic telescopic rod (23) fixedly mounted on the movable mounting seat (22), the telescopic end of the hydraulic telescopic rod (23) extending into the through groove (19) and fixedly connected to a pressing sleeve (26), and a first sealing sleeve (27) is fixedly mounted on one end of the pressing sleeve (26) away from the hydraulic telescopic rod (23); The second translation mechanism comprises a second shift motor (30) fixedly arranged at one end of the fixed mounting seat (29); the output shaft of the second shift motor (30) is coaxially fixedly connected to the second shift screw (32); the fixed mounting seat (29) is slidably connected to the shift block (31); the second shift screw (32) passes through the shift block (31) and is threadedly connected thereto; the arc-shaped outer sleeve (18) is fixedly connected to the shift guide rod (28); the shift guide rod (28) passes through the movable mounting seat (22) and is fixedly connected to the shift block (31).

2. The cylinder pressure differential air tightness detection device according to claim 1, characterized in that: The first translation mechanism comprises a first shift motor (10) fixedly arranged on the end seat (9), the output shaft of the first shift motor (10) being coaxially fixedly connected to a first shift screw (11), the first shift screw (11) passing through the moving seat (6) and being threadedly connected thereto, and a guide rod (12) arranged parallel to the first shift screw (11) being fixedly connected to the end seat (9), the guide rod (12) passing through the moving seat (6) and being slidably connected thereto.

3. The cylinder pressure differential air tightness detection device according to claim 1, characterized in that: The air extraction component comprises an air extraction pipe (14) fixedly arranged at the end of the plugging head (8); an air extraction pump (13) is fixedly connected to the movable seat (6); and an input end of the air extraction pump (13) is fixedly connected to the air extraction pipe (14).

4. The cylinder pressure differential air tightness detection device according to claim 1, characterized in that: The pressurizing device (3) is an air compressor.

5. The cylinder pressure differential air tightness detection device according to claim 1, characterized in that: An end frame (37) is fixedly connected between one ends of the two fixed mounting seats (29); a side of the end frame (37) close to the bottle body (25) is fixedly connected to an end pressing member (38); a side of the sealing head (8) close to the bottle body (25) is provided with an end slot (33); a sealing gasket (34) is fixedly provided in the end slot (33); a gas passage (35) is provided in the sealing head (8); and the gas passage (35) is communicated with the end slot (33) and the exhaust pipe (14).

6. The cylinder pressure differential air tightness detection device according to claim 5, characterized in that: The end clamping member (38) comprises an outer sleeve seat, the outer sleeve seat is fixedly connected to the end frame (37), a second clamping spring is fixedly connected inside the outer sleeve seat, the second clamping spring is fixedly connected to the clamping seat, and a second sealing sleeve (36) is fixedly provided outside the plugging head (8).

7. The cylinder pressure differential airtightness detection device according to claim 1, characterized in that: The top of the rotating plate (5) is fixedly connected to a handle (17), and the top and bottom ends of the rotating plate (5) close to one end of the top plate (4) are respectively fixedly connected to an upper limit stopper (15) and a lower limit stopper (16).

8. The cylinder pressure differential air tightness detection device according to claim 6, characterized in that: The first sealing sleeve (27), the second sealing sleeve (36) and the sealing pad (34) are all made of silicone.

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