Pipe fitting air tightness detection equipment

Abstract

A pipe fitting airtightness detection device relates to the technical field of pipe fitting airtightness detection equipment and comprises a detection table, a fixing plate is detachably arranged at the top of the detection table, a movable sealing plate is horizontally and movably arranged at the end of the fixing plate, an air pressure sensor is arranged at the lower end of the movable sealing plate, and a vent groove is formed in the movable sealing plate. One end of the vent groove horizontally penetrates through the movable sealing plate, the other end of the vent groove is communicated with an external air pump through a vent pipe, a fixed base is fixedly arranged at the top of the detection table, and an inner circular guide rail and an outer circular guide rail which are coaxially arranged are arranged at the top of the fixed base; the inner circular guide rail and the outer circular guide rail are provided with a steering pipe fitting detection assembly and a three-way detection assembly respectively, the top of the detection table is provided with a four-way detection assembly, and the position, located in the inner circular guide rail, of the top of the fixed base is detachably provided with a fixed V-shaped plate. According to the invention, the problems of high equipment purchase and maintenance cost and low detection efficiency caused by poor universality of existing pipe fitting air tightness detection equipment are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of pipe fitting airtightness detection equipment, and specifically provides a pipe fitting airtightness detection equipment. Background Art

[0002] Pipe fittings are key components in a pipeline system for connecting, branching, turning, or controlling fluids, and are widely used in fields such as construction, petroleum, chemical industry, power, water supply and drainage, etc. They ensure the sealing performance, strength, and fluid transportation continuity of the pipeline system. Among them, pipe fittings that achieve flow splitting or merging are branch pipe fittings, and pipe fittings that change the flow direction are turning pipe fittings. Branch pipe fittings are divided into tees and crosses, and tees are further divided into T-shaped tees and Y-shaped tees. Y-shaped tees are further divided into multiple types according to the angle between two of their pipe orifices. Crosses are divided into cross-shaped crosses and three-dimensional crosses. Turning pipe fittings are classified into multiple types according to the turning angle.

[0003] In the production and quality control of pipe fittings, airtightness detection is a key link to ensure the sealing performance of pipe fittings. However, existing airtightness detection equipment can only perform independent tests on a single type of pipe fitting, with poor versatility. This limitation leads to enterprises needing to equip multiple sets of special equipment when detecting different pipe fittings, which not only increases the equipment procurement and maintenance costs, but also reduces the detection efficiency. For example, when detecting a turning pipe fitting with a certain turning angle, one type of fixture is required, and when detecting a turning pipe fitting with another turning angle, another set of fixtures needs to be replaced. Similarly, when detecting different types of tees or crosses, the corresponding fixtures need to be replaced, which is cumbersome to operate and difficult to adapt to the production requirements of multiple varieties and small batches. Therefore, developing a universal detection equipment that can adapt to different types of pipe fittings has become an important research direction in pipe fitting production. Summary of the Invention

[0004] Aiming at the defects in the prior art, the technical problem to be solved by the present invention is to provide a pipe fitting airtightness detection equipment, which adopts an adaptive fixture and an adaptive sealing structure, enabling a single device to adapt to multiple pipe fittings, eliminating the need for frequent tooling changes, greatly improving the detection efficiency and equipment utilization rate, and reducing the equipment procurement cost and maintenance cost.

[0005] To solve the above problems, the present invention provides the following technical solutions: A pipe fitting airtightness detection device includes a detection table. A fixing plate is detachably arranged on the top of the detection table. A movable sealing plate is horizontally movable at the end of the fixing plate. A pressure sensor is arranged at the lower end of the movable sealing plate. An air vent groove is arranged inside the movable sealing plate. One end of the air vent groove horizontally penetrates through the movable sealing plate, and the other end of the air vent groove is communicated with an external air pump through an air pipe. A fixed base is fixedly arranged on the top of the detection table. An inner circular guide rail and an outer circular guide rail are coaxially arranged on the top of the fixed base. A steering pipe fitting detection component and a tee joint detection component are respectively arranged on the inner circular guide rail and the outer circular guide rail. A four-way detection component is arranged on the top of the detection table. A fixed V-shaped plate is detachably arranged at a position inside the inner circular guide rail on the top of the fixed base. A lifting V-shaped plate arranged opposite to it is vertically lifted above the fixed V-shaped plate; The steering pipe fitting detection component includes a first rotating plate rotatably connected to the inner circular guide rail. A first support plate and a first connecting plate are detachably arranged on the top of the first rotating plate. A first sealing plate is horizontally movable at the end of the first support plate. One end of the first connecting plate extends into the inner circular guide rail and is provided with a detachably arranged first V-shaped plate.

[0006] As an optimized scheme, the tee joint detection component includes a second rotating plate rotatably connected to the outer circular guide rail. A second support plate and a second connecting plate are detachably arranged on the top of the second rotating plate. A second sealing plate is horizontally movable at the end of the second support plate. One end of the second connecting plate extends into the inner circular guide rail and is provided with a detachably arranged second V-shaped plate. Rubber pads are laid on the outer walls of the fixed V-shaped plate, the lifting V-shaped plate, the first V-shaped plate and the second V-shaped plate.

[0007] As an optimized scheme, the four-way detection component includes an arc-shaped plate detachably connected to the detection table. A rotating U-shaped plate is rotatably arranged on the inner wall of the arc-shaped plate. A fixed U-shaped plate is detachably arranged at the end of the rotating U-shaped plate. A third sealing plate is horizontally movable at the end of the fixed U-shaped plate. A stop plate is fixedly connected to one end of the arc-shaped plate. Sealing pads are laid at the ends of the movable sealing plate, the first sealing plate, the second sealing plate and the third sealing plate.

[0008] As an optimized scheme, a driving telescopic cylinder is fixedly arranged at the end of the fixing plate. The telescopic end of the driving telescopic cylinder passes through the fixing plate and is fixedly connected to the movable sealing plate.

[0009] As an optimized scheme, a support frame is detachably arranged on the top of the detection table. A lifting telescopic cylinder is arranged on the top of the support frame. The telescopic end of the lifting telescopic cylinder is fixedly connected to the lifting V-shaped plate.

[0010] As an optimized solution, a number of circular guide rollers are detachably provided at the bottoms of the first rotating plate and the second rotating plate. The circular guide rollers at the bottom of the first rotating plate are in rolling cooperation with the inner circular guide rail, and the circular guide rollers at the bottom of the second rotating plate are in rolling cooperation with the outer circular guide rail.

[0011] As an optimized solution, fixed toothed rings are detachably provided at the bottoms of the inner circular guide rail and the outer circular guide rail. The fixed toothed rings are detachably connected to the fixed base. Servo motors are fixedly provided at the tops of the first rotating plate and the second rotating plate. The output ends of the servo motors pass through the first rotating plate or the second rotating plate and are fixedly connected with drive gears meshing with the fixed toothed rings.

[0012] As an optimized solution, electric control telescopic cylinders are fixedly provided at the ends of the first support plate and the second support plate. The telescopic end of one of the electric control telescopic cylinders passes through the first support plate and is fixedly connected with the first sealing plate, and the telescopic end of the other electric control telescopic cylinder passes through the second support plate and is fixedly connected with the second sealing plate.

[0013] As an optimized solution, two arc guide rails are fixedly provided on the inner wall of the arc plate. A number of arc guide rollers are detachably provided on the opposite inner walls of the rotating U-shaped plate. The arc guide rollers are in rolling cooperation with the arc guide rails. An installation groove is provided on the outer wall of the arc plate. A fixed rack is detachably provided on the inner wall of the installation groove. A drive shaft is provided inside the rotating U-shaped plate. The two ends of the drive shaft are rotatably connected to the opposite inner walls of the rotating U-shaped plate. A control gear meshing with the fixed rack is fixedly sleeved on the outer wall of the drive shaft. A drive motor is fixedly provided at the end of the rotating U-shaped plate. The output end of the drive motor is fixedly connected with the drive shaft.

[0014] As an optimized solution, a control telescopic cylinder is fixedly provided on the inner wall of the fixed U-shaped plate. The telescopic end of the control telescopic cylinder passes through the fixed U-shaped plate and is fixedly connected with the third sealing plate.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. When detecting a steering pipe fitting, one servo motor drives the first rotating plate to rotate along the inner circular guide rail until the angle between the fixed V-shaped plate and the first V-shaped plate is the same as the steering angle of the pipe fitting. Place the steering pipe fitting on the fixed V-shaped plate and the first V-shaped plate. The lifting telescopic cylinder drives the lifting V-shaped plate to move downward until the lifting V-shaped plate abuts against the steering pipe fitting. The fixed V-shaped plate and the lifting V-shaped plate clamp and fix the steering pipe fitting. The driving telescopic cylinder and the electric control telescopic cylinder drive the moving sealing plate and the first sealing plate to move respectively until the moving sealing plate and the first sealing plate respectively abut against the two pipe orifices of the steering pipe fitting. The air pump sends gas into the steering pipe fitting through the ventilation pipe and the ventilation groove, and then maintains the pressure for a period of time. The air pressure sensor detects whether the pressure drops, so as to judge whether there is an air leakage phenomenon in the steering pipe fitting. By adjusting the position of the first rotating plate, the steering pipe fittings with different steering angles can be detected, realizing the function of detecting the steering pipe fittings with different steering angles by the same device; 2. When detecting a tee, two servo motors drive the first rotating plate and the second rotating plate to rotate along the inner circular guide rail and the outer circular guide rail respectively until the arrangement of the fixed V-shaped plate, the first V-shaped plate and the second V-shaped plate is the same as the arrangement of the three pipe orifices of the tee pipe fitting. Place the tee pipe fitting on the fixed V-shaped plate, the first V-shaped plate and the second V-shaped plate. The lifting V-shaped plate descends and clamps and fixes the tee pipe fitting. The moving sealing plate, the first sealing plate and the second sealing plate seal the pipe orifices of the tee pipe fitting. The air pump sends gas into the tee pipe fitting. The air pressure sensor detects the pressure change in the tee pipe fitting. By adjusting the positions of the first rotating plate and the second rotating plate, the T-shaped tee and the Y-shaped tee with different included angles can be detected, realizing the function of detecting the T-shaped tee and the Y-shaped tee with different included angles by the same device; 3. When detecting a cross-shaped four-way, the driving motor drives the rotating U-shaped plate to rotate downward to the horizontal state. Two servo motors drive the first rotating plate and the second rotating plate to rotate respectively until the moving sealing plate and the first sealing plate are directly opposite, and the second sealing plate and the third sealing plate are directly opposite. Place the cross-shaped four-way on the fixed V-shaped plate, the first V-shaped plate and the second V-shaped plate. The lifting V-shaped plate descends and clamps and fixes the four-way pipe fitting. The moving sealing plate, the first sealing plate, the second sealing plate and the third sealing plate seal the pipe orifices of the four-way pipe fitting. The air pump sends gas into the tee pipe fitting. The air pressure sensor detects the pressure change in the tee pipe fitting. When detecting a three-dimensional four-way, the driving motor drives the rotating U-shaped plate to rotate upward to the vertical state, and repeating the above detection process can detect the three-dimensional four-way, realizing the function of detecting the cross-shaped four-way and the three-dimensional four-way by the same device; 4. This airtightness detection device adopts an adaptive fixture and an adaptive sealing structure, enabling a single device to adapt to a variety of pipe fittings, eliminating the need for frequent replacement of tooling, greatly improving the detection efficiency and equipment utilization rate, and reducing the equipment procurement cost and maintenance cost. Description of the Drawings

[0016] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts do not necessarily draw to actual scale.

[0017] Figure 1 Structural schematic diagram of the present invention; Figure 2 Structural schematic diagram of the interior of the movable sealing plate of the present invention; Figure 3 Structural schematic diagram of the top of the fixed base of the present invention; Figure 4 Structural schematic diagram of the steering pipe fitting detection assembly of the present invention; Figure 5 Structural schematic diagram of the top and bottom of the first rotating plate of the present invention; Figure 6 Structural schematic diagram of the four-way detection assembly of the present invention; Figure 7 Structural schematic diagram of the inner circular guide rail, outer circular guide rail and fixed toothed ring of the present invention; Figure 8 Structural schematic diagram of the bottom of the inner circular guide rail of the present invention; Figure 9 Structural schematic diagram of the interior of the rotating U-shaped plate of the present invention; Figure 10 Structural schematic diagram of the installation groove of the present invention.

[0018] In the figure: 1 - detection table; 2 - fixed base; 3 - tee detection assembly; 4 - fixed plate; 5 - movable sealing plate; 6 - lifting V-shaped plate; 7 - support frame; 8 - four-way detection assembly; 9 - outer circular guide rail; 10 - steering pipe fitting detection assembly; 11 - inner circular guide rail; 12 - lifting telescopic cylinder; 13 - fixed V-shaped plate; 14 - first sealing plate; 15 - first support plate; 16 - first rotating plate; 17 - driving telescopic cylinder; 18 - ventilation pipe; 19 - sealing gasket; 20 - ventilation groove; 21 - air pressure sensor; 22 - driving gear; 23 - servo motor; 24 - electric control telescopic cylinder; 25 - rubber gasket; 26 - circular guide rail roller; 27 - second sealing plate; 28 - second support plate; 29 - second rotating plate; 30 - second connecting plate; 31 - second V-shaped plate; 32 - first V-shaped plate; 33 - first connecting plate; 34 - fixed toothed ring; 35 - third sealing plate; 36 - fixed U-shaped plate; 37 - rotating U-shaped plate; 38 - stop plate; 39 - arc plate; 40 - driving motor; 41 - control telescopic cylinder; 42 - arc guide rail roller; 43 - arc guide rail; 44 - fixed rack; 45 - control gear; 46 - driving shaft; 47 - installation groove. Detailed implementation mode

[0019] The embodiments of the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings. The following embodiments are only used to illustrate the technical solutions of the present invention more clearly, so they are only examples and cannot be used to limit the protection scope of the present invention.

[0020] As Figures 1 to 10 shown, a pipe fitting airtightness detection device includes a detection table 1. A fixed plate 4 is detachably arranged on the top of the detection table 1. A moving sealing plate 5 is horizontally moved at the end of the fixed plate 4. A pressure sensor 21 is arranged at the lower end of the moving sealing plate 5. An air vent groove 20 is arranged inside the moving sealing plate 5. One end of the air vent groove 20 horizontally penetrates through the moving sealing plate 5, and the other end of the air vent groove 20 is connected to an external air pump through an air pipe 18. A fixed base 2 is fixedly arranged on the top of the detection table 1. An inner circular guide rail 11 and an outer circular guide rail 9 are coaxially arranged on the top of the fixed base 2. A steering pipe fitting detection assembly 10 and a tee detection assembly 3 are respectively arranged on the inner circular guide rail 11 and the outer circular guide rail 9. A four-way detection assembly 8 is arranged on the top of the detection table 1. A fixed V-shaped plate 13 is detachably arranged at a position inside the inner circular guide rail 11 on the top of the fixed base 2. A lifting V-shaped plate 6 arranged opposite to it is vertically lifted above the fixed V-shaped plate 13; The steering pipe fitting detection assembly 10 includes a first rotating plate 16 rotatably connected to the inner circular guide rail 11. A first support plate 15 and a first connecting plate 33 are detachably arranged on the top of the first rotating plate 16. A first sealing plate 14 is horizontally moved at the end of the first support plate 15. One end of the first connecting plate 33 extends into the inner circular guide rail 11 and is provided with a detachably arranged first V-shaped plate 32.

[0021] The tee detection assembly 3 includes a second rotating plate 29 rotatably connected to the outer circular guide rail 9. A second support plate 28 and a second connecting plate 30 are detachably arranged on the top of the second rotating plate 29. A second sealing plate 27 is horizontally moved at the end of the second support plate 28. One end of the second connecting plate 30 extends into the inner circular guide rail 11 and is provided with a detachably arranged second V-shaped plate 31. Rubber pads 25 are laid on the outer walls of the fixed V-shaped plate 13, the lifting V-shaped plate 6, the first V-shaped plate 32 and the second V-shaped plate 31.

[0022] The four-way detection assembly 8 includes an arc plate 39 detachably connected to the detection table 1. A rotating U-shaped plate 37 is rotatably arranged on the inner wall of the arc plate 39. A fixed U-shaped plate 36 is detachably arranged at the end of the rotating U-shaped plate 37. A third sealing plate 35 is horizontally moved at the end of the fixed U-shaped plate 36. A stop plate 38 is fixedly connected to one end of the arc plate 39. Sealing gaskets 19 are laid at the ends of the moving sealing plate 5, the first sealing plate 14, the second sealing plate 27 and the third sealing plate 35.

[0023] A driving telescopic cylinder 17 is fixedly arranged at the end of the fixed plate 4, and the telescopic end of the driving telescopic cylinder 17 passes through the fixed plate 4 and is fixedly connected with the movable sealing plate 5.

[0024] A support frame 7 is detachably arranged on the top of the detection table 1, and a lifting telescopic cylinder 12 is arranged on the top of the support frame 7. The telescopic end of the lifting telescopic cylinder 12 is fixedly connected with the lifting V-shaped plate 6.

[0025] A plurality of detachably arranged circular guide rollers 26 are arranged at the bottoms of the first rotating plate 16 and the second rotating plate 29. The circular guide rollers 26 at the bottom of the first rotating plate 16 are in rolling cooperation with the inner circular guide 11, and the circular guide rollers 26 at the bottom of the second rotating plate 29 are in rolling cooperation with the outer circular guide 9.

[0026] Detachably arranged fixed toothed rings 34 are arranged at the bottoms of the inner circular guide 11 and the outer circular guide 9. The fixed toothed rings 34 are detachably connected with the fixed base 2. Servo motors 23 are fixedly arranged at the tops of the first rotating plate 16 and the second rotating plate 29. The output ends of the servo motors 23 pass through the first rotating plate 16 or the second rotating plate 29 and are fixedly connected with driving gears 22 meshing with the fixed toothed rings 34.

[0027] Electric control telescopic cylinders 24 are fixedly arranged at the ends of the first support plate 15 and the second support plate 28. The telescopic end of one of the electric control telescopic cylinders 24 passes through the first support plate 15 and is fixedly connected with the first sealing plate 14, and the telescopic end of the other electric control telescopic cylinder 24 passes through the second support plate 28 and is fixedly connected with the second sealing plate 27.

[0028] Two arc-shaped guides 43 are fixedly arranged on the inner wall of the arc-shaped plate 39. A plurality of detachably arranged arc-shaped guide rollers 42 are arranged on the opposite inner walls of the rotating U-shaped plate 37. The arc-shaped guide rollers 42 are in rolling cooperation with the arc-shaped guides 43. An installation groove 47 is arranged on the outer wall of the arc-shaped plate 39. A fixed rack 44 is detachably arranged on the inner wall of the installation groove 47. A driving shaft 46 is arranged in the rotating U-shaped plate 37. The two ends of the driving shaft 46 are rotatably connected with the opposite inner walls of the rotating U-shaped plate 37. A control gear 45 meshing with the fixed rack 44 is fixedly sleeved on the outer wall of the driving shaft 46. A driving motor 40 is fixedly arranged at the end of the rotating U-shaped plate 37. The output end of the driving motor 40 is fixedly connected with the driving shaft 46.

[0029] A control telescopic cylinder 41 is fixedly arranged on the inner wall of the fixed U-shaped plate 36. The telescopic end of the control telescopic cylinder 41 passes through the fixed U-shaped plate 36 and is fixedly connected with the third sealing plate 35.

[0030] The working principle of this device is as follows: When detecting a steering pipe fitting, one of the servo motors 23 drives the first rotating plate 16 to rotate along the inner circular guide rail 11 until the angle between the fixed V-shaped plate 13 and the first V-shaped plate 32 is the same as the steering angle of the pipe fitting. Place the steering pipe fitting on the fixed V-shaped plate 13 and the first V-shaped plate 32. The lifting telescopic cylinder 12 drives the lifting V-shaped plate 6 to move downward until the lifting V-shaped plate 6 abuts against the steering pipe fitting. The fixed V-shaped plate 13 and the lifting V-shaped plate 6 clamp and fix the steering pipe fitting. The driving telescopic cylinder 17 and the electric control telescopic cylinder 24 respectively drive the moving sealing plate 5 and the first sealing plate 14 to move until the moving sealing plate 5 and the first sealing plate 14 respectively abut against the two pipe orifices of the steering pipe fitting. The air pump sends gas into the steering pipe fitting through the ventilation pipe 18 and the ventilation groove 20, and then maintains the pressure for a period of time. The air pressure sensor 21 detects whether the pressure drops, so as to judge whether there is an air leakage phenomenon in the steering pipe fitting. By adjusting the position of the first rotating plate 16, the steering pipe fittings with different steering angles can be detected, realizing the function of detecting steering pipe fittings with different steering angles by the same device; When detecting a tee joint, two servo motors 23 drive the first rotating plate 16 and the second rotating plate 29 to rotate along the inner circular guide rail 11 and the outer circular guide rail 9 respectively until the arrangement of the fixed V-shaped plate 13, the first V-shaped plate 32 and the second V-shaped plate 31 is the same as the arrangement of the three pipe orifices of the tee joint pipe fitting. Place the tee joint pipe fitting on the fixed V-shaped plate 13, the first V-shaped plate 32 and the second V-shaped plate 31. The lifting V-shaped plate 6 descends and clamps and fixes the tee joint pipe fitting. The moving sealing plate 5, the first sealing plate 14 and the second sealing plate 27 seal the pipe orifices of the tee joint pipe fitting. The air pump sends gas into the tee joint pipe fitting. The air pressure sensor 21 detects the pressure change in the tee joint pipe fitting. By adjusting the positions of the first rotating plate 16 and the second rotating plate 29, the T-shaped tee joint and the Y-shaped tee joint with different included angles can be detected, realizing the function of detecting the T-shaped tee joint and the Y-shaped tee joint with different included angles by the same device; When detecting a cross-shaped four-way joint, the driving motor 40 drives the rotating U-shaped plate 37 to rotate downward to the horizontal state. Two servo motors 23 respectively drive the first rotating plate 16 and the second rotating plate 29 to rotate until the moving sealing plate 5 and the first sealing plate 14 are directly opposite to each other, and the second sealing plate 27 and the third sealing plate 35 are directly opposite to each other. Place the cross-shaped four-way joint on the fixed V-shaped plate 13, the first V-shaped plate 32 and the second V-shaped plate 31. The lifting V-shaped plate 6 descends and clamps and fixes the four-way joint pipe fitting. The moving sealing plate 5, the first sealing plate 14, the second sealing plate 27 and the third sealing plate 35 seal the pipe orifices of the four-way joint pipe fitting. The air pump sends gas into the tee joint pipe fitting. The air pressure sensor 21 detects the pressure change in the tee joint pipe fitting. When detecting a three-dimensional four-way joint, the driving motor 40 drives the rotating U-shaped plate 37 to rotate upward to the vertical state, and repeating the above detection process can detect the three-dimensional four-way joint, realizing the function of detecting the cross-shaped four-way joint and the three-dimensional four-way joint by the same device; This airtightness detection device adopts an adaptive fixture and an adaptive sealing structure, enabling a single device to adapt to multiple pipe fittings without frequent tooling changes, greatly improving the detection efficiency and equipment utilization rate, and reducing the equipment procurement cost and maintenance cost.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered by the scope of the claims and the specification of the present invention.

Claims

1. A pipe air tightness detection device, characterized in that: The invention comprises a testing platform (1), wherein a fixing plate (4) is detachably provided on the top of the testing platform (1), a movable sealing plate (5) is provided at the end of the fixing plate (4) for horizontal movement, a pressure sensor (21) is provided at the lower end of the movable sealing plate (5), a ventilation groove (20) is provided inside the movable sealing plate (5), one end of the ventilation groove (20) horizontally penetrates the movable sealing plate (5), and the other end of the ventilation groove (20) is connected to an external air pump via a ventilation pipe (18), a fixed base (2) is fixedly provided on the top of the testing platform (1), and the The top of the fixed base (2) is provided with a coaxially arranged inner circular guide rail (11) and an outer circular guide rail (9), the inner circular guide rail (11) and the outer circular guide rail (9) are respectively provided with a steering pipe detection assembly (10) and a three-way detection assembly (3), the top of the detection platform (1) is provided with a four-way detection assembly (8), the top of the fixed base (2) is located inside the inner circular guide rail (11) and is detachably provided with a fixed V-shaped plate (13), and a lifting V-shaped plate (6) arranged opposite to the fixed V-shaped plate (13) is provided vertically above the fixed V-shaped plate (13); The steering tube detection assembly (10) comprises a first rotating plate (16) rotatably connected to the inner circular guide rail (11); a first supporting plate (15) and a first connecting plate (33) are detachably provided on the top of the first rotating plate (16); a first sealing plate (14) is horizontally movable at the end of the first supporting plate (15); one end of the first connecting plate (33) extends into the inner circular guide rail (11) and is detachably provided with a first V-shaped plate (32).

2. The pipe air tightness detection device according to claim 1, characterized in that: The three-way detection assembly (3) comprises a second rotating plate (29) rotatably connected to the outer circular guide rail (9); the second rotating plate (29) is detachably provided with a second support plate (28) and a second connecting plate (30) on the top; the second support plate (28) is horizontally movable with a second sealing plate (27) at the end; one end of the second connecting plate (30) extends into the inner circular guide rail (11) and is detachably provided with a second V-shaped plate (31); and the outer walls of the fixed V-shaped plate (13), the lifting V-shaped plate (6), the first V-shaped plate (32) and the second V-shaped plate (31) are all paved with rubber pads (25).

3. A pipe air tightness detection device according to claim 2, characterized in that: The four-way detection assembly (8) comprises an arc-shaped plate (39) detachably connected to the detection platform (1); a rotating U-shaped plate (37) is rotatably provided on the inner wall of the arc-shaped plate (39); a fixed U-shaped plate (36) is detachably provided on the end of the rotating U-shaped plate (37); a third sealing plate (35) is horizontally movably provided on the end of the fixed U-shaped plate (36); a stop plate (38) is fixedly connected to one end of the arc-shaped plate (39); and sealing pads (19) are laid on the ends of the movable sealing plate (5), the first sealing plate (14), the second sealing plate (27) and the third sealing plate (35).

4. The pipe air tightness detection device according to claim 1, characterized in that: A driving telescopic cylinder (17) is fixedly provided at the end of the fixed plate (4), and the telescopic end of the driving telescopic cylinder (17) passes through the fixed plate (4) and is fixedly connected to the movable sealing plate (5).

5. The pipe air tightness detection device according to claim 1, characterized in that: The top of the testing platform (1) is detachably provided with a support frame (7), the top of the support frame (7) is provided with a lifting and telescopic cylinder (12), and the telescopic end of the lifting and telescopic cylinder (12) is fixedly connected to the lifting V-shaped plate (6).

6. The pipe air tightness detection device according to claim 2, characterized in that: The bottom of each of the first rotating plate (16) and the second rotating plate (29) is provided with a plurality of detachably arranged circular guide rollers (26); the circular guide rollers (26) at the bottom of the first rotating plate (16) are in rolling cooperation with the inner circular guide rail (11), and the circular guide rollers (26) at the bottom of the second rotating plate (29) are in rolling cooperation with the outer circular guide rail (9).

7. The pipe air tightness detection device according to claim 6, characterized in that: The bottom of the inner circular guide rail (11) and the bottom of the outer circular guide rail (9) are both provided with a detachably arranged fixed toothed ring (34), and the fixed toothed ring (34) is detachably connected to the fixed base (2). The top of the first rotating plate (16) and the second rotating plate (29) are both fixedly provided with a servo motor (23), and the output end of the servo motor (23) passes through the first rotating plate (16) or the second rotating plate (29) and is fixedly connected to a driving gear (22) meshing with the fixed toothed ring (34).

8. The pipe air tightness detection device according to claim 2, characterized in that: The ends of the first support plate (15) and the second support plate (28) are both fixedly provided with electric-controlled telescopic cylinders (24), wherein the telescopic end of one of the electric-controlled telescopic cylinders (24) passes through the first support plate (15) and is fixedly connected to the first sealing plate (14), and the telescopic end of the other electric-controlled telescopic cylinder (24) passes through the second support plate (28) and is fixedly connected to the second sealing plate (27).

9. The pipe air tightness detection device according to claim 3, characterized in that: Two arc-shaped guide rails (43) are fixedly provided on the inner wall of the arc-shaped plate (39); the inner walls opposite to the rotating U-shaped plate (37) are each provided with a plurality of detachably arranged arc-shaped guide rail rollers (42); the arc-shaped guide rail rollers (42) and the arc-shaped guide rails (43) are rollingly matched; the outer wall of the arc-shaped plate (39) is provided with a mounting groove (47); the inner wall of the mounting groove (47) is detachably provided with a fixed rack (44); a drive shaft (46) is provided inside the rotating U-shaped plate (37); both ends of the drive shaft (46) are rotatably connected to the inner walls opposite to the rotating U-shaped plate (37); a control gear (45) meshing with the fixed rack (44) is fixedly sleeved on the outer wall of the drive shaft (46); a drive motor (40) is fixedly provided at the end of the rotating U-shaped plate (37); the output end of the drive motor (40) is fixedly connected to the drive shaft (46).

10. The pipe air tightness detection device according to claim 3, characterized in that: A control telescopic cylinder (41) is fixedly provided on the inner wall of the fixed U-shaped plate (36), and a telescopic end of the control telescopic cylinder (41) passes through the fixed U-shaped plate (36) and is fixedly connected to the third sealing plate (35).

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