An airtightness testing device and method for stainless steel pipe fittings

Abstract

This invention discloses a stainless steel pipe fitting airtightness testing device in the field of stainless steel pipe fitting technology. It includes a base and a worktable. The base has an adjustment component, a movable seat, and a movable plate on both sides. The movable plate has a first end plate and a second end plate, and correspondingly, an air inlet component and a cleaning component. The worktable has a conveying component, a movable component, and three sets of first limiting grooves. This invention adjusts the position of the first and second end plates using the adjustment component to test pipe fittings of different lengths, and adjusts the height of the worktable to ensure the pipe fitting end height is compatible with the sealing plate and the cleaning component. The cleaning component cleans the pipe fitting ends to prevent foreign matter from adhering and affecting the test results. By setting three sets of first limiting grooves on the worktable, the loading, cleaning, testing, and unloading of pipe fittings can be performed simultaneously, increasing the number of pipe fittings and improving the testing effect.

Description

Technical Field

[0001] This invention relates to the field of stainless steel pipe fittings technology, specifically to a device for testing the air tightness of stainless steel pipe fittings. Background Technology

[0002] Stainless steel pipe fittings are characterized by easy installation, high performance, and durability. They are widely used in industrial pipelines for conveying goods in petroleum, chemical, medical, food, light industry, and machinery, as well as in mechanical structural components. Pipe fittings used in conveying pipelines require airtightness testing after processing to prevent gaps and through holes.

[0003] A device for testing the air tightness of stainless steel pipes, patent application number CN202222177192.6, comprises a testing platform, a fixed plate, and a movable plate. A fixed plug is welded and fixed to the fixed plate, and a movable plug is welded and fixed to the side wall of the movable plate. The movable plate is connected to a drive mechanism at the bottom of the testing platform, and a testing component is provided between the fixed plate and the movable plate. By using the drive assembly, the movable plate, and the plug to seal and clamp stainless steel pipes of different diameters, and injecting a certain amount of gas into the stainless steel pipes to observe the pressure gauge reading, the air tightness test can be completed.

[0004] However, during the processing of stainless steel pipe fittings, other substances may adhere to their ends. When the above-mentioned device directly fixes and seals the ends of the stainless steel pipe fittings through the plug, the substances adhering to the ends of the pipe fittings may affect the sealing effect, thereby affecting the airtightness test results.

[0005] Based on this, the present invention designs an airtightness testing device for stainless steel pipe fittings to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to provide a stainless steel pipe fitting air tightness testing device to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] An airtightness testing device for stainless steel pipe fittings includes a base and a worktable;

[0009] The workbench is located above the middle of the base, and the four corners of the bottom surface are connected to the base by the second hydraulic telescopic rods. The top middle and both sides of the workbench are provided with three sets of first limiting grooves. Each set includes multiple first limiting grooves that are evenly and parallelly arranged. The first limiting grooves are V-shaped and arranged in the left and right directions.

[0010] The top center of the workbench is provided with a moving groove along the front-to-back direction. The upper part of the two side walls of the moving groove is provided with slide rails. The bottom of the slide rails is connected to the bottom surface of the moving groove through multiple evenly arranged third hydraulic telescopic rods. The openings of the two slide rails are arranged opposite each other and are connected to the conveying component. A moving component is provided between the bottoms of the two slide rails, and the moving component is connected to the drive component accordingly.

[0011] The base has symmetrical side plates fixed on both sides of its top surface, a fixed box in the middle, an adjustment assembly between the side plates and the fixed box, and a movable seat connected to each of the two adjustment assemblies. A vertical movable plate is fixed on the top surface of the movable seat. A first end plate is provided on the inner side of the movable plate corresponding to the middle position of the workbench, and a second end plate is provided corresponding to the rear section of the workbench. The first end plate and the second end plate are respectively connected to the movable plate through a first hydraulic telescopic rod. A cleaning assembly is provided on the second end plate corresponding to a group of multiple first limit grooves on the rear section of the workbench.

[0012] On the first end plate, sealing plates are fixed at the positions of multiple first limiting slots corresponding to the middle group of the worktable. A pressure sensor is provided in the middle of the multiple sealing plates on the right side, and an air intake assembly is connected in the middle of the multiple sealing plates on the left side.

[0013] Preferably, the air intake assembly includes an air intake pipe fixed to the first end plate. The air intake pipe is located on the side of the first end plate near the movable plate, and one end of the air intake pipe is connected to an air pump. An air inlet is provided at the center of the sealing plate, and one end of the air inlet is fixedly connected to the air intake pipe.

[0014] Preferably, a sealing gasket is fixed on the sealing plate, and a through hole is provided at the center of the sealing gasket corresponding to the position of the air pressure sensor and the air inlet.

[0015] Preferably, the cleaning assembly includes a rotating shaft rotatably connected to the second end plate. A second worm gear is fixed at one end of the rotating shaft near the moving plate, and a vertical brush plate is fixed at the other end. Brush bristles are evenly distributed on the outer surface of the brush plate. The bottoms of multiple second worm gears mesh with a second worm. The second worm is rotatably connected to the second end plate, and a motor is connected to one end of the worm.

[0016] Preferably, the adjustment assembly includes two screws symmetrically arranged and threadedly connected to the movable seat. The two ends of the screws are rotatably connected to the side plate and the side wall of the fixed box, and the inner end extends into the fixed box. The two screws located on the same side of the fixed box are coaxially arranged, and a first worm gear is fixed between their inner ends. The bottoms of the two first worm gears are engaged with a first worm. The first worm is rotatably connected to the side wall of the fixed box, and one end is connected to a motor.

[0017] Preferably, the conveying assembly includes a conveying plate slidably connected between two slide rails, a fixed seat fixed on the top surface of the conveying plate, two sets of V-shaped second limiting grooves provided on the fixed seat, the positions of the two sets of second limiting grooves corresponding to the positions of two sets of first limiting grooves on the worktable, and a transverse connecting groove provided at the bottom of the conveying plate, and the connecting groove correspondingly connected to the moving assembly.

[0018] Preferably, the moving component includes a fixed frame between the bottoms of two slide rails, two rotating disks symmetrically arranged and rotatably connected on the fixed frame, a vertical connecting shaft eccentrically arranged and rotatably connected on the rotating disks, the top end of the connecting shaft extending into the connecting groove at the bottom of the conveyor plate, a second gear coaxially fixed at the bottom of the rotating disks, a first gear meshing with the inner side of the second gear, the two first gears meshing with each other, and one of the first gears being connected to a motor.

[0019] Preferably, multiple balls are evenly provided on both sides, as well as on the top and bottom of the conveyor plate, and the balls contact the inner wall of the slide rail.

[0020] Preferably, a triangular reinforcing seat is fixed between the middle of the inner side of the movable plate and the top of the movable seat.

[0021] A testing method using the above-mentioned stainless steel pipe fitting air tightness testing equipment includes the following steps:

[0022] S1. Based on the length and diameter of the stainless steel pipe fitting, adjust the position of the moving seats on both sides by adjusting the adjustment assembly, thereby adjusting the position of the first end plate and the second end plate, and adjust the height of the worktable by adjusting the second hydraulic telescopic rod.

[0023] S2. Load the stainless steel pipe fittings so that the pipe fittings are located in a group of multiple first limiting grooves on the rear section of the workbench;

[0024] S3. Activate the first hydraulic telescopic rod at the second end plate to bring the cleaning component on the second end plate into contact with the end of the pipe and clean the end of the pipe.

[0025] S4. The pipe fitting is conveyed by the cooperation of the third hydraulic telescopic rod and the conveying assembly, so that the pipe fitting moves outward to the first limiting groove in the middle of the worktable;

[0026] S5. Activate the first hydraulic telescopic rod at the first end plate so that the sealing plate on the first end plate contacts and presses against the end of the pipe, and then perform air tightness detection through the air intake assembly and air pressure sensor.

[0027] S6. The pipe fitting is conveyed by the conveying assembly, and the inspected pipe fitting is moved to a set of limiting grooves on the front section of the workbench for unloading.

[0028] Compared with the prior art, the beneficial effects of the present invention are:

[0029] 1. The present invention adjusts the position of the two movable seats by adjusting the component, and then adjusts the position of the first end plate and the second end plate on both sides to adapt to the length of the pipe fitting, so as to detect pipe fittings of different lengths;

[0030] 2. The present invention adjusts the position of the workbench by means of a second hydraulic telescopic rod, so as to place pipes of different diameters and make the height of their ends adaptable to the sealing plate and cleaning components;

[0031] 3. In this invention, after cleaning the end of the pipe fitting with a cleaning component, the air tightness is tested through structures such as an air intake component, so as to avoid other things adhering to the end of the pipe fitting and affecting the test results.

[0032] 4. The present invention uses a third hydraulic telescopic rod, slide rail, conveying assembly and moving assembly to convey pipes, eliminating the need for manual handling, making the conveying of pipes on the workbench faster and more convenient.

[0033] 5. This invention enables the simultaneous loading, cleaning, inspection, and unloading of pipe fittings by setting three sets of first limiting grooves on the workbench, thereby increasing the number of pipe fittings and improving the inspection effect. Attached Figure Description

[0034] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of the structure of the present invention;

[0036] Figure 2 This is a schematic diagram of the structure of the movable plate of the present invention;

[0037] Figure 3 This is a schematic diagram of the structure of the second end plate of the present invention;

[0038] Figure 4 This is a schematic diagram of the structure of the second end plate of the present invention;

[0039] Figure 5 This is a schematic diagram of the internal structure of the fixing box of the present invention;

[0040] Figure 6 This is a schematic diagram of the structure of the workbench of the present invention;

[0041] Figure 7 This is a schematic diagram of the conveyor plate of the present invention.

[0042] The attached diagram lists the components represented by each number as follows:

[0043] 1-Base, 101-Side plate, 102-Screw, 103-Fixing box, 104-First worm gear, 105-First worm;

[0044] 2-Moving seat, 201-Moving plate, 202-First hydraulic telescopic rod, 203-Reinforcing seat;

[0045] 3-Workbench, 301-Moving groove, 302-Second hydraulic telescopic rod, 303-First limiting groove;

[0046] 4-Conveyor plate, 401-Fixed seat, 402-Second limiting groove, 403-Connecting groove;

[0047] 5-Slide rail, 501-Third hydraulic telescopic rod, 502-Fixed frame, 503-First gear, 504-Second gear, 505-Rotating disk, 506-Connecting shaft;

[0048] 6-First end plate, 601-Sealing plate, 602-Pressure sensor, 603-Air inlet, 604-Air inlet pipe, 605-Air pump;

[0049] 7-Second end plate, 701-Rotating shaft, 702-Brush plate, 703-Second worm gear, 704-Second worm. Detailed Implementation

[0050] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0051] Example 1

[0052] Please refer to the accompanying drawings. This invention provides a technical solution:

[0053] A stainless steel pipe fitting air tightness testing device includes a base 1 and a worktable 3;

[0054] The workbench 3 is located above the middle of the base 1, and the four corners of the bottom surface are connected to the base 1 by the second hydraulic telescopic rod 302. The top middle and both sides of the workbench 3 are provided with three sets of first limiting grooves 303. Each set includes multiple first limiting grooves 303 that are evenly and parallelly arranged. The first limiting grooves 303 are V-shaped and arranged in the left and right directions.

[0055] The top center of the workbench 3 is provided with a moving groove 301 along the front-back direction. The upper part of the two side walls of the moving groove 301 is provided with slide rails 5. The bottom of the slide rails 5 is connected to the bottom surface of the moving groove 301 through a plurality of evenly arranged third hydraulic telescopic rods 501. The openings of the two slide rails 5 are arranged opposite each other and are connected to the conveying component. A moving component is provided between the bottoms of the two slide rails 5, and the moving component is connected to the drive component accordingly.

[0056] Side plates 101 are symmetrically fixed on both sides of the top surface of the base 1, and a fixed box 103 is provided in the middle. An adjustment component is provided between the side plates 101 and the fixed box 103, and a movable seat 2 is connected to each of the two adjustment components. A vertical movable plate 201 is fixed on the top surface of the movable seat 2. A first end plate 6 is provided on the inner side of the movable plate 201 corresponding to the middle position of the workbench 3, and a second end plate 7 is provided corresponding to the rear section of the workbench 3. The first end plate 6 and the second end plate 7 are respectively connected to the movable plate 201 through a first hydraulic telescopic rod 202, and a cleaning component is provided on the second end plate 7 corresponding to the position of a group of multiple first limit grooves 303 on the rear section of the workbench 3.

[0057] On the first end plate 6, a sealing plate 601 is fixed at the position of a plurality of first limiting grooves 303 in the middle group of the worktable 3. A pressure sensor 602 is provided in the middle of the plurality of sealing plates 601 on the right side, and an air intake assembly is connected in the middle of the plurality of sealing plates 601 on the left side.

[0058] When conducting airtightness testing, the positions of the first end plate 6 and the second end plate 7 are first adjusted according to the length of the stainless steel pipe fitting. The moving seats 2 on both sides are moved towards the worktable 3 by the adjustment component, so that the positions of the first end plate 6 and the second end plate 7 on both sides are adapted to the position of the pipe fitting end. The worktable 3 can be moved vertically by the second hydraulic telescopic rod 302 so that after the subsequent pipe fitting is placed in the first limiting groove 303, its position can correspond to the position of the sealing plate 601, cleaning component and other structures.

[0059] Stainless steel pipe fittings are placed on a set of multiple first limiting grooves 303 on the rear section of the workbench 3 by external devices or manual operation. The cleaning component on the second end plate 7 approaches the end of the pipe fitting and moves the second end plate 7 toward the pipe fitting by the first hydraulic telescopic rod 202, so that the cleaning component contacts the end of the pipe fitting. The end of the pipe fitting is cleaned by the cleaning component to prevent other things from adhering to the end of the pipe fitting, which facilitates subsequent airtightness testing.

[0060] The slide rail 5 and the conveying assembly are moved upward by the third hydraulic telescopic rod 501, so that the conveying assembly contacts the bottom of the pipe and lifts it up, so that the bottom of the pipe is higher than the top of the workbench 3. The moving assembly is used to move the conveying assembly to move the pipe forward, so that the cleaned pipes move to the multiple first limiting grooves 303 in the middle of the workbench 3. The slide rail 5 and the conveying assembly are moved downward by the third hydraulic telescopic rod 501, so that the pipes fall into the multiple first limiting grooves 303 in the middle of the workbench 3. The moving assembly is used to return the conveying assembly to the rearward position for the next conveying of pipes.

[0061] The first end plate 6 is moved towards the worktable 3 by the first hydraulic telescopic rod 202, so that the sealing plate 601 contacts and presses against the end of the pipe, thereby sealing the pipe. Air is introduced into the key interior through the air intake assembly, and the air pressure sensor 602 detects the air pressure inside the pipe, thereby detecting the airtightness of the pipe.

[0062] Each time the conveying component moves, it simultaneously contacts the pipes on the middle and rear sections of the workbench 3 and moves to the rear, conveying the cleaned pipes to the middle of the workbench 3. At the same time, it conveys the pipes that have been inspected in the middle of the workbench 3 to the front section of the workbench 3, making it convenient for the pipes to be unloaded by external devices or by manual labor.

[0063] This application sets three sets of first limit grooves 303 on the workbench 3, so that the loading, cleaning, inspection and unloading of pipe fittings can be carried out simultaneously, and the number of pipe fittings can be increased to improve the inspection effect.

[0064] The air intake assembly includes an air intake pipe 604 fixed on the first end plate 6. The air intake pipe 604 is located on the side of the first end plate 6 near the movable plate 201, and one end of the air intake pipe 604 is connected to an air pump 605. An air inlet 603 is provided at the center of the sealing plate 601, and one end of the air inlet 603 is fixedly connected to the air intake pipe 604. When both ends of the pipe are sealed by the sealing plate 601, air is introduced into the pipe through the air pump 605 and the air intake pipe 604 to test the air tightness of the pipe.

[0065] The cleaning assembly includes a rotating shaft 701 rotatably connected to the second end plate 7. A second worm gear 703 is fixed at one end of the rotating shaft 701 near the moving plate 201, and a vertical brush plate 702 is fixed at the other end. Brush bristles are evenly distributed on the outer surface of the brush plate 702. The bottoms of multiple second worm gears 703 are engaged with a second worm 704. The second worm 704 is rotatably connected to the second end plate 7, and a motor is connected to one end. When the brush plate 702 contacts the end of the pipe, the motor causes the second worm 704 to rotate, which in turn causes the multiple second worm gears 703 to drive the rotating shaft 701 and the brush plate 702 to rotate, and the brush bristles on the brush plate 702 clean the end of the pipe.

[0066] The conveying assembly includes a conveying plate 4 slidably connected between two slide rails 5. A fixed seat 401 is fixed on the top surface of the conveying plate 4. The fixed seat 401 is provided with two sets of V-shaped second limiting grooves 402. The positions of the two sets of second limiting grooves 402 correspond to the positions of two sets of first limiting grooves 303 on the worktable 3. The bottom of the conveying plate 4 is provided with a transverse connecting groove 403, and the connecting groove 403 is correspondingly connected to the moving assembly.

[0067] When the slide rail 5 moves upward under the action of the third hydraulic telescopic rod 501, the conveying plate 4 moves upward accordingly, lifting the pipe and separating it from the worktable 3. The conveying plate 4 then moves the pipe outward through the moving component and connecting groove 403. Then, the slide rail 5 and the conveying plate 4 move the pipe downward, thereby moving the cleaned pipe to the inspection position and the inspected pipe to the unloading position, thus realizing the pipe conveying.

[0068] The moving component includes a fixed frame 502 between the bottoms of two slide rails 5. Two rotating disks 505 are symmetrically arranged and rotatably connected on the fixed frame 502. A vertical connecting shaft 506 is eccentrically arranged and rotatably connected on the rotating disks 505. The top end of the connecting shaft 506 extends into the connecting groove 403 at the bottom of the conveyor plate 4. A second gear 504 is coaxially fixed to the bottom of the rotating disk 505. A first gear 503 meshes with the inner side of the second gear 504. The two first gears 503 mesh with each other, and one of the first gears 503 is connected to a motor. The motor causes the first gear 503 to rotate, and through the transmission of the first gear 503 and the second gear 504, the rotating disk 505 drives the connecting shaft 506 to rotate. The connecting shaft 506 and the connecting groove 403 cause the conveyor plate 4 to move along the slide rails 5. After moving to the correct position, the rotating disk 505 continues to rotate, and the connecting shaft 506 and the connecting groove 403 cause the conveyor plate 4 to return to its original position.

[0069] Example 2

[0070] The structure of this embodiment is basically the same as that of Embodiment 1. The difference is that the adjustment component includes two screws 102 symmetrically arranged and threadedly connected to the movable seat 2. The two ends of the screws 102 are rotatably connected to the side plate 101 and the side wall of the fixed box 103, and the inner end extends into the fixed box 103. The two screws 102 located on the same side of the fixed box 103 are coaxially arranged, and a first worm gear 104 is fixed between their inner ends. The bottoms of the two first worm gears 104 are engaged with a first worm 105. The first worm 105 is rotatably connected to the side wall of the fixed box 103, and one end is connected to a motor. The motor causes the first worm 105 to rotate, thereby causing the two first worm gears 104 to drive the four screws 102 to rotate simultaneously. The screws 102 on the left and right movable seats 2 have opposite threads, thereby causing the two movable seats 2 to move simultaneously toward the middle of the base 1, adjusting the positions of the first end plates 6 and the second end plates 7 on both sides.

[0071] Example 3

[0072] The structure of this embodiment is basically the same as that of embodiment one. The difference is that a sealing gasket is fixed on the sealing plate 601. A through hole is provided at the center of the sealing gasket corresponding to the position of the air pressure sensor 602 and the air inlet 603. When the sealing plate 601 seals the end of the pipe, the sealing gasket contacts the end of the pipe to improve the sealing performance.

[0073] Multiple balls are evenly provided on both sides, top, and bottom of the conveyor plate 4. The balls contact the inner wall of the slide rail 5, thereby reducing the friction between the conveyor plate 4 and the slide rail 5 and improving the movement flexibility of the conveyor plate 4.

[0074] A triangular reinforcing seat 203 is fixed between the middle of the inner side of the movable plate 201 and the top of the movable seat 2, thereby improving the positional stability between the movable plate 201 and the movable seat 2.

[0075] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0076] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to specific implementations. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A stainless steel pipe fitting air tightness testing device, comprising a base (1) and a worktable (3), characterized in that: The workbench (3) is located above the middle of the base (1), and the four corners of the bottom surface are connected to the base (1) by the second hydraulic telescopic rod (302). The top middle and both sides of the workbench (3) are provided with three sets of first limiting grooves (303). Each set includes multiple first limiting grooves (303) arranged evenly and in parallel. The first limiting grooves (303) are set in a V shape and are arranged in the left and right directions. The top center of the workbench (3) is provided with a moving groove (301) along the front-back direction. The upper part of the two side walls of the moving groove (301) is provided with slide rails (5). The bottom of the slide rails (5) is connected to the bottom surface of the moving groove (301) through a plurality of evenly arranged third hydraulic telescopic rods (501). The openings of the two slide rails (5) are arranged opposite to each other and are connected to a conveying component. A moving component is provided between the bottoms of the two slide rails (5), and the moving component is connected to the driving component accordingly. The base (1) has side plates (101) symmetrically fixed on both sides of its top surface, and a fixed box (103) in the middle. An adjustment assembly is provided between the side plates (101) and the fixed box (103), and a movable seat (2) is connected to each of the two adjustment assemblies. A vertical movable plate (201) is fixed on the top surface of the movable seat (2). A first end plate (6) is provided on the inner side of the movable plate (201) corresponding to the middle position of the workbench (3), and a second end plate (7) is provided corresponding to the rear section of the workbench (3). The first end plate (6) and the second end plate (7) are respectively connected to the movable plate (201) through a first hydraulic telescopic rod (202), and a cleaning assembly is provided on the second end plate (7) corresponding to a group of multiple first limiting grooves (303) on the rear section of the workbench (3). The cleaning assembly includes a rotating shaft (701) rotatably connected to the second end plate (7). A second worm gear (703) is fixed at one end of the rotating shaft (701) near the moving plate (201), and a vertical brush plate (702) is fixed at the other end. Brush bristles are evenly distributed on the outer surface of the brush plate (702). The bottoms of multiple second worm gears (703) are engaged with a second worm (704). The second worm (704) is rotatably connected to the second end plate (7), and a motor is connected to one end. On the first end plate (6), a sealing plate (601) is fixed at the position of a plurality of first limiting grooves (303) in the middle of the worktable (3), and a pressure sensor (602) is provided in the middle of the plurality of sealing plates (601) on the right side, and an air intake assembly is connected in the middle of the plurality of sealing plates (601) on the left side.

2. The apparatus for leak testing of stainless steel pipe fittings according to claim 1, wherein: The air intake assembly includes an air intake pipe (604) fixed on the first end plate (6). The air intake pipe (604) is located on the side of the first end plate (6) near the movable plate (201), and one end of the air intake pipe (604) is connected to an air pump (605). An air inlet (603) is provided at the center of the sealing plate (601), and one end of the air inlet (603) is fixedly connected to the air intake pipe (604).

3. The apparatus for leak testing of stainless steel pipe fittings according to claim 2, wherein: A sealing gasket is fixed on the sealing plate (601), and a through hole is provided at the center of the sealing gasket corresponding to the position of the air pressure sensor (602) and the air inlet (603).

4. The apparatus for leak testing stainless steel tubing according to claim 1, wherein: The adjustment assembly includes two screws (102) symmetrically arranged and threadedly connected to the movable seat (2). The two ends of the screws (102) are rotatably connected to the side plate (101) and the side wall of the fixed box (103), and the inner end extends into the fixed box (103). The two screws (102) located on the same side of the fixed box (103) are coaxially arranged, and a first worm gear (104) is fixed between their inner ends. The bottoms of the two first worm gears (104) are engaged with a first worm (105). The first worm (105) is rotatably connected to the side wall of the fixed box (103), and one end is connected to a motor.

5. The stainless steel pipe fitting air tightness testing equipment according to claim 1, characterized in that: The conveying assembly includes a conveying plate (4) slidably connected between two slide rails (5). A fixed seat (401) is fixed on the top surface of the conveying plate (4). The fixed seat (401) is provided with two sets of V-shaped second limiting grooves (402). The positions of the two sets of second limiting grooves (402) correspond to the positions of two sets of first limiting grooves (303) on the worktable (3). The bottom of the conveying plate (4) is provided with a transverse connecting groove (403), and the connecting groove (403) is correspondingly connected to the moving assembly.

6. The stainless steel pipe fitting airtightness testing equipment according to claim 5, characterized in that: The moving component includes a fixed frame (502) between the bottoms of two slide rails (5). Two rotating disks (505) are symmetrically arranged and rotatably connected on the fixed frame (502). A vertical connecting shaft (506) is eccentrically arranged and rotatably connected on the rotating disks (505). The top end of the connecting shaft (506) extends into the connecting groove (403) at the bottom of the conveyor plate (4). A second gear (504) is coaxially fixed at the bottom of the rotating disk (505). A first gear (503) meshes with the inner side of the second gear (504). The two first gears (503) mesh with each other, and one of the first gears (503) is connected to a motor.

7. The stainless steel pipe fitting air tightness testing equipment according to claim 6, characterized in that: The conveyor plate (4) has multiple balls evenly distributed on both sides, top, and bottom, and these balls contact the inner wall of the slide rail (5).

8. The stainless steel pipe fitting air tightness testing equipment according to claim 1, characterized in that: A triangular reinforcing seat (203) is fixed between the middle of the inner side of the movable plate (201) and the top of the movable seat (2).

9. A testing method using the stainless steel pipe fitting airtightness testing equipment as described in claim 1, characterized in that, Includes the following steps: S1. Based on the length and diameter of the stainless steel pipe fittings, adjust the position of the two moving seats (2) by adjusting the components, thereby adjusting the position of the first end plate (6) and the second end plate (7), and adjust the height position of the worktable (3) by adjusting the second hydraulic telescopic rod (302). S2. Load the stainless steel pipe fittings so that the pipe fittings are located in a set of multiple first limiting grooves (303) on the rear section of the workbench (3); S3. Activate the first hydraulic telescopic rod (202) at the second end plate (7) to make the cleaning component on the second end plate (7) contact the end of the pipe and clean the end of the pipe; S4. The pipe fitting is conveyed by the third hydraulic telescopic rod (501) and the conveying assembly, so that the pipe fitting moves outward to the first limiting groove (303) in the middle of the workbench (3); S5. Activate the first hydraulic telescopic rod (202) at the first end plate (6) so that the sealing plate (601) on the first end plate (6) contacts and presses against the end of the pipe fitting, and then the air tightness is detected by the air intake assembly and the air pressure sensor (602). S6. The pipe is conveyed by the conveying assembly, so that the inspected pipe is moved to a set of limiting grooves on the front section of the workbench (3) and the pipe is unloaded.

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