A flange air tightness detection device

Abstract

The application discloses a flange air tightness detection device and belongs to the technical field of flange air tightness detection equipment. The device comprises a cabinet, a flange feeding structure, a top cylinder lifting device, a progressive clamping assembly and an air tightness detection clamp plate. The flange feeding structure, the top cylinder lifting device and the progressive clamping assembly are all clamped and installed in the cabinet. The flange feeding structure is arranged on the side wall of the cabinet, the top cylinder lifting device is arranged on the bottom wall of the cabinet, the progressive clamping assembly is clamped and installed on the top wall of the cabinet, and the air tightness detection clamp plate is arranged on the progressive clamping assembly. A digital pressure gauge and a display screen are arranged on the side wall of the cabinet. The device overcomes the defects of low operation efficiency, inaccurate positioning and lack of real-time visual feedback of detection results in the prior art, provides a flange air tightness detection device, and effectively solves the problems that flange air tightness detection in the current market relies on manual operation, it is difficult to accurately position a leakage point, and pressure change cannot be monitored in real time.

Description

Technical Field

[0001] This invention belongs to the technical field of flange airtightness testing equipment, specifically referring to a flange airtightness testing device. Background Technology

[0002] Currently, flanges, as critical components in pipeline connections, rely primarily on manual methods for airtightness testing. Operators must manually assemble the flange and gasket, place them at the testing station, and then tighten them one by one using external clamps. Leakage is then determined using either the bubble method or the pressure decay method. This traditional testing process depends heavily on manual intervention, with separate actions for loading, positioning, and clamping. This not only results in low efficiency but also makes it difficult to guarantee consistency and repeatability of testing conditions due to differences in operator skill and physical strength. This hinders the standardization process of batch testing.

[0003] Furthermore, existing airtightness testing methods are mostly indirect or qualitative. For example, the bubble method can only determine the presence of a leak by visually observing bubbles, but cannot quantify the extent of the leak; while the pressure decay method can obtain the overall pressure change, it is difficult to accurately locate the leak point and is insensitive to minor leaks. More importantly, the test results usually rely on manual reading and recording, lacking a real-time, visualized pressure feedback mechanism. Operators cannot intuitively obtain the instantaneous pressure changes between the flange and the gasket during the test, resulting in delayed and inaccurate leak detection, which fails to meet the high reliability and traceability requirements of modern industry. Summary of the Invention

[0004] In response to the above situation, and to overcome the shortcomings of existing technologies such as low efficiency of manual operation, inaccurate positioning, and lack of real-time visual feedback of test results, this invention provides a flange airtightness testing device, which effectively solves the problems of current flange airtightness testing relying on manual labor, difficulty in accurately locating leak points, and inability to monitor pressure changes in real time.

[0005] The technical solution adopted by this invention is as follows: This invention provides a flange airtightness testing device, including a cabinet, a flange feeding structure, a top cylinder lifting device, a progressive clamping assembly, and an airtightness testing clamp. The flange feeding structure, the top cylinder lifting device, and the progressive clamping assembly are all snapped into the cabinet. The flange feeding structure is located on the side wall of the cabinet, the top cylinder lifting device is located on the bottom wall of the cabinet, the progressive clamping assembly is snapped into the top wall of the cabinet, and the airtightness testing clamp is located on the progressive clamping assembly. A digital pressure gauge and a display screen are provided on the side wall of the cabinet.

[0006] Furthermore, the flange feeding structure includes a feeding drawer, cylinder A, cylinder B, slide rail, slide groove A, slide groove B, limiting column, gear A, and rack B. The flange assembly with gaskets installed is placed in the feeding drawer and sent to the cabinet for testing. Slide groove A and slide groove B are respectively located on the front and rear baffles of the feeding drawer. The two ends of the slide rail engage and slide within slide groove A and slide groove B, respectively. The limiting column passes through a groove in the slide rail and engages and slides within the groove. Gear A engages and rotates within the rear baffle of the feeding drawer. Rack B engages and slides within the rear baffle of the feeding drawer, and gear A and rack B mesh with each other. Cylinder B is fixedly installed on the front and rear baffles of the feeding drawer, and the extension / retraction portion of cylinder B is fixedly connected to the limiting column. Cylinder A is fixedly installed on the inner wall of the cabinet, and the extension / retraction portion of cylinder A is fixedly connected to the bottom wall of the feeding drawer. Reinforcing ribs are provided at the connection point to increase stability.

[0007] Furthermore, the side wall of the feeding drawer is provided with a downward-facing convex rail, and a roller is provided between the convex rail and the inner wall of the cabinet. The roller engages and rotates inside the cabinet, and the roller reduces the frictional resistance during the movement of the feeding drawer.

[0008] Furthermore, the top cylinder lifting device includes a rigid pipe, a telescopic hose, cylinders C and D, a support plate C and D, and a shock-absorbing support column. Cylinders C and D are fixed to the bottom wall of the cabinet. Support plates C and D are fixedly connected to the telescopic parts of cylinders C and D, respectively. The telescopic hose is installed on the bottom wall of support plate C. The rigid pipe is installed on the top wall of support plate C by threaded connection. The diameter of the rigid pipe can be changed according to the flange diameter, and the rigid pipe is connected to the telescopic hose. The shock-absorbing support column is fixedly installed on the top wall of support plate D. The top of the shock-absorbing support column is provided with a rubber connecting block to reduce friction between the lifting device and the flange.

[0009] Furthermore, a camera is provided on the top wall of the tray C to calibrate whether the rigid tube can enter the channel at the center of the flange and to transmit the camera information to the display.

[0010] Furthermore, an annular air bladder is provided on the side wall of the rigid pipe. After the air bladder is inflated, the gap between the flange and the rigid pipe is eliminated to prevent air leakage.

[0011] Furthermore, the progressive clamping assembly includes a cross-shaped limiting plate, sleeve A, sleeve B, a guide air pipe, a connecting sleeve, an adjusting plate, bracket A, bracket B, and a movable locking block. The cross-shaped limiting plate engages and rotates within the cabinet. Sleeve A is fixedly positioned at the center point of the cross-shaped limiting plate. Sleeve B is engaged and installed on the outer wall of sleeve A. The guide air pipe is threaded to the inner wall of sleeve A. The connecting sleeve is threaded to the bottom wall of the guide air pipe. A suitable connecting sleeve is selected for installation based on the size of the test flange. The movable locking block engages and slides in a groove on the cross-shaped limiting plate. The adjusting plate is fixedly connected to the movable locking block. Both brackets A and B are hinged to the adjusting plate and are parallel to each other. Both brackets A and B are hinged to the outer wall of the sleeve B. The guide air tube engages and rotates on the bottom wall of the sleeve B. When the guide air tube rotates spirally inside the sleeve A, the sleeve B slides up and down on the outer wall of the sleeve A. The movement direction of brackets A and B is restricted by the sliding groove in the cross limiting plate. The included angle between brackets A and B and the sleeve B changes. When the connecting sleeve moves downward, the movable locking block moves to the position of the guide air tube.

[0012] Furthermore, the progressive clamping assembly also includes a bevel gear assembly A and a bevel gear assembly B. The bevel gear assembly A is fixedly installed on the sleeve A, and the inner wall of the bevel gear assembly B is provided with a ball spline shaft. The ball spline shaft engages and slides vertically on the outer wall of the guide air pipe. The bevel gear assembly B drives the guide air pipe to rotate through the ball spline shaft, thereby causing the guide air pipe to slide along the threads on the inner wall of the sleeve A.

[0013] Furthermore, an annular air bladder is provided on the outer wall of the connecting sleeve. After the air bladder is inflated, the gap between the flange and the connecting sleeve is eliminated to prevent air leakage.

[0014] Furthermore, the airtightness testing clamp includes a connecting bracket, a flange clamping plate, a rotating slot, a pressing bracket, a pressing block, a cylinder E, and a trapezoidal guide plate. The connecting bracket engages and slides within the adjusting plate. The connecting bracket slides upward along the slot on the bottom wall of the adjusting plate. To prevent the connecting bracket from falling off the adjusting plate, a plug is inserted into the slot on the adjusting plate to restrict the range of motion of the connecting bracket. The flange clamping plate is fixedly connected to the connecting bracket. The rotating slot is set on the flange clamping plate. The pressing bracket engages and rotates within the rotating slot. A torsion spring is provided at the engagement point between the rotating slot and the pressing bracket. The pressing block is fixedly installed at one end of the pressing bracket. The trapezoidal guide plate is in contact with the other end of the pressing bracket. The cylinder E is fixedly set on the side wall of the flange clamping plate. The telescopic part of the cylinder E is fixedly connected to the trapezoidal guide plate. When the cylinder E retracts, the trapezoidal guide plate moves towards the flange clamping plate. The pressing bracket is pressed and rotated by the side wall of the trapezoidal guide plate. The pressing block contacts and is fixed to the upper and lower walls of the flange.

[0015] Furthermore, the contact edge between the extrusion bracket and the trapezoidal guide plate is rounded to reduce wear on the edge of the extrusion bracket.

[0016] Furthermore, a pressure sensor is provided on the flange clamping plate. The pressure sensor can be a microelectromechanical system differential pressure sensor. The pressure sensor mainly monitors whether there is air leakage between the flange and the gasket. If there is air leakage, the pressure sensor transmits the pressure value to the digital pressure gauge through the controller for display, and monitors the pressure value in real time.

[0017] Furthermore, the limiting column is higher than the feeding drawer, and a hinge plate is provided at the upper end of the inlet and outlet of the feeding drawer. The hinge plate deflects when the feeding drawer slides in and out.

[0018] The flange airtightness testing device provided in this solution has the following advantages: (1) The automatic feeding, positioning, clamping and testing of flanges are integrated. The limiting column and gear rack in the flange feeding structure ensure that the center of the flange is always in the center; the top cylinder lifting device uses a camera to assist the rigid tube to accurately enter the flange channel, and the airbag eliminates gaps to avoid air leakage; the progressive clamping assembly and the air tightness test clamping plate automatically clamp and fix the flange. The whole process does not require manual intervention, which significantly improves the testing efficiency and operation consistency. (2) Improved accuracy and real-time performance of airtightness testing. A pressure sensor is installed on the flange clamping plate of the airtightness testing clamp to directly monitor whether there is air leakage between the flange and the gasket, and transmits the pressure value to a digital pressure gauge for display in real time. Compared with traditional methods, it can more sensitively detect minute leaks, and the pressure change is displayed intuitively on the screen, which makes it easier for operators to judge the flange sealing performance in a timely manner and ensures the reliability of the test results. Attached Figure Description

[0019] Figure 1 A left perspective view of a flange airtightness testing device provided by the present invention; Figure 2 Right perspective view of a flange airtightness testing device provided by the present invention; Figure 3 A bottom perspective view of the internal structure of a flange airtightness testing device provided by the present invention; Figure 4 A top perspective view of the internal structure of a flange airtightness testing device provided by the present invention; Figure 5 A bottom view of the internal structure of a flange airtightness testing device provided by the present invention; Figure 6A top view of the internal structure of a flange airtightness testing device provided by the present invention; Figure 7 This is a schematic diagram of the internal structure of the flange loading structure. Figure 8 This is a three-dimensional sectional view of the flange loading structure; Figure 9 A bottom-view perspective view of the top cylinder lifting device; Figure 10 A three-dimensional view of the progressive clamping assembly; Figure 11 A three-dimensional sectional view of the progressive clamping assembly; Figure 12 This is a three-dimensional sectional view of the airtightness testing clamp.

[0020] Among them, 100 is the cabinet, 200 is the flange feeding structure, 300 is the top cylinder lifting device, 400 is the progressive clamping assembly, 500 is the airtightness testing clamp, 201 is the feeding drawer, 202 is cylinder A, 203 is cylinder B, 204 is the slide rail, 205 is the slide groove A, 206 is the slide groove B, 207 is the limit column, 208 is the gear A, 209 is the rack B, 210 is the convex rail, 301 is the rigid pipe, 302 is the telescopic hose, 303 is the cylinder C, 304 is the cylinder D, 305 is the pallet C, 306 is the pallet D, and 307 is the pallet D. 401. Vibration damping support column; 402. Cross limit plate; 403. Sleeve A; 404. Sleeve B; 405. Air guide pipe; 406. Connecting sleeve; 407. Adjusting plate; 408. Bracket A; 409. Bracket B; 410. Movable locking block; 411. Bevel gear assembly A; 412. Bevel gear assembly B; 501. Ball spline shaft; 502. Connecting bracket; 503. Flange clamping plate; 504. Rotating slot; 505. Pressing block; 506. Cylinder E; 507. Trapezoidal guide plate; 101. Hinge plate.

[0021] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. Detailed Implementation

[0022] 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. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0023] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0024] like Figures 1-12 As shown, the present invention provides a flange airtightness testing device, including a cabinet 100, a flange feeding structure 200, a top cylinder lifting device 300, a progressive clamping assembly 400, and an airtightness testing clamping plate 500. The flange feeding structure 200, the top cylinder lifting device 300, and the progressive clamping assembly 400 are all snapped into place inside the cabinet 100. The flange feeding structure 200 is slidably pulled out to the side wall of the cabinet 100. The top cylinder lifting device 300 is located on the bottom wall of the cabinet 100. The progressive clamping assembly 400 is snapped into place on the top wall of the cabinet 100. The airtightness testing clamping plate 500 is located on the progressive clamping assembly 400. A digital pressure gauge and a display screen are provided on the side wall of the cabinet 100.

[0025] The flange feeding structure 200 includes a feeding drawer 201, cylinder A202, cylinder B203, slide rail 204, slide groove A205, slide groove B206, limiting column 207, gear A208, and rack B209. Slide grooves A205 and B206 are respectively located on the front and rear baffles of the feeding drawer 201. The two ends of the slide rail 204 engage and slide within slide grooves A205 and B206, respectively. The limiting column 207 passes through a groove in the slide rail 204 and engages and slides within the groove. Gear A208 engages and slides within the loading drawer 201. The rear baffle of the 1 engages and rotates, and the rack B209 engages and slides within the rear baffle of the feeding drawer 201. The gear A208 and the rack B209 mesh with each other. The rack B209 is fixedly connected to the slide rail 204. The cylinder B203 is fixedly installed on the front and rear baffles of the feeding drawer 201, and the telescopic part of the cylinder B203 is fixedly connected to the limiting column 207. The cylinder A202 is fixedly installed on the inner wall of the cabinet 100, and the telescopic part of the cylinder A202 is fixedly connected to the bottom wall of the feeding drawer 201, with reinforcing ribs at the connection.

[0026] The side wall of the feeding drawer 201 is provided with a downward-facing convex rail 210.

[0027] The top cylinder lifting device 300 includes a rigid pipe 301, a telescopic hose 302, cylinders C303 and D304, a support plate C305 and D306, and a shock-absorbing support column 307. Cylinders C303 and D304 are fixed to the bottom wall of the cabinet 100. Support plates C305 and D306 are fixedly connected to the telescopic parts of cylinders C303 and D304, respectively. The telescopic hose 302 is installed on the bottom wall of support plate C305. The rigid pipe 301 is installed on the top wall of support plate C305 by threaded connection, and the rigid pipe 301 is connected to the telescopic hose 302. The shock-absorbing support column 307 is fixedly installed on the top wall of support plate D306, and the top of the shock-absorbing support column 307 is provided with a rubber connecting block.

[0028] A camera is installed on the top wall of the tray C305.

[0029] The rigid tube 301 has an annular air bladder on its side wall.

[0030] The progressive clamping assembly 400 includes a cross-shaped limiting plate 401, sleeve A 402, sleeve B 403, air guide tube 404, connecting sleeve 405, adjusting plate 406, bracket A 407, bracket B 408, and movable locking block 409. The cross-shaped limiting plate 401 is engaged and rotated within the cabinet 100. Sleeve A 402 is fixedly mounted at the center point of the cross-shaped limiting plate 401. Sleeve B 403 is engaged and mounted on the outer wall of sleeve A 402. The air guide tube 404 is threaded to the inner wall of the inner sleeve A 402. The connecting sleeve 405 is threadedly connected to the bottom wall of the guide tube 404. The movable locking block 409 engages and slides in the groove on the cross limiting plate 401. The adjusting plate 406 is fixedly connected to the movable locking block 409. The brackets A407 and B408 are both hinged to the adjusting plate 406, and the brackets A407 and B408 are parallel to each other. The brackets A407 and B408 are both hinged to the outer wall of the sleeve B403. The guide tube 404 engages and rotates on the bottom wall of the sleeve B403.

[0031] The progressive clamping assembly 400 also includes a bevel gear assembly A410 and a bevel gear assembly B411. The bevel gear assembly A410 is fixedly mounted on the sleeve A402. The inner wall of the bevel gear assembly B411 is provided with a ball spline shaft 412. The air guide pipe 404 is axially engaged and slid on the inner wall of the ball spline shaft 412. The bevel gear assembly B411 drives the air guide pipe 404 to rotate through the ball spline shaft 412, thereby causing the air guide pipe 404 to slide along the thread on the inner wall of the sleeve A402.

[0032] The outer wall of the connecting sleeve 405 is provided with an annular air bladder.

[0033] The airtightness testing clamp 500 includes a connecting bracket 501, a flange clamping plate 502, a rotating slot 503, a pressing bracket 504, a pressing block 505, a cylinder E 506, and a trapezoidal guide plate 507. The connecting bracket 501 engages and slides within the adjusting plate 406. The connecting bracket 501 slides upward along the slot on the bottom wall of the adjusting plate 406. A plug is inserted into the slot on the adjusting plate 406 to limit the range of motion of the connecting bracket 501. The flange clamping plate 502 is fixedly attached to the connecting bracket 501. The rotating slot 503 is set on the flange clamping plate 502. The extrusion bracket 504 is engaged and rotated in the rotating slot 503. A torsion spring is provided at the engagement point between the rotating slot 503 and the extrusion bracket 504. The pressing block 505 is fixedly installed at one end of the extrusion bracket 504. The trapezoidal guide plate 507 is in contact with the other end of the extrusion bracket 504. The cylinder E506 is fixedly set on the side wall of the flange clamping plate 502. The telescopic part of the cylinder E506 is fixedly connected to the trapezoidal guide plate 507.

[0034] The contact edges between the extrusion bracket 504 and the trapezoidal guide plate 507 are rounded.

[0035] A pressure sensor is installed on the flange clamping plate 502.

[0036] The limiting column 207 is higher than the feeding drawer 201. A hinge plate 101 is set at the upper end of the inlet and outlet of the feeding drawer 201. The hinge plate 101 deflects when the feeding drawer 201 slides in and out.

[0037] In practical use, after the flange is installed and tightened, the assembled and tightened flange product is placed in the loading drawer 201. The gear A208 is driven by the motor. Under the meshing connection, the rack B209 slides horizontally. At the same time, the cylinder B203 extends. The limiting column 207 moves towards the flange under the action of the cylinder B203. The four limiting columns 207 limit the range of motion of the flange. The extension and retraction lengths of the four sets of cylinders B203 are the same. The two sets of racks B209 are driven by the gear A208 at the same time and move the same distance, ensuring that the center position of the flange remains in a suitable position. When cylinder A202 retracts, the loading drawer 201 carrying the flange is hidden inside the cabinet 100. During the process of the loading drawer 201 entering the cabinet 100, the limiting column 207 pushes the hinge plate 101 and causes the hinge plate 101 to rotate until the loading drawer 201 enters the cabinet 100. The hinge plate 101 is reset under the action of the torsion spring. Cylinders C303 and D304 extend, rigid tube 301 and shock-absorbing support column 307 are raised, telescopic hose 302 is stretched, support plate C305 is raised, and the distance between the camera and the hole on the bottom wall of the flange is shortened, effectively monitoring whether the rigid tube 301 is facing the flange. After the rigid tube 301 enters the flange, the air bladder on the side wall of the rigid tube 301 inflates and expands, separating the gap between the rigid tube 301 and the flange, thus sealing the bottom opening of the flange. At the same time, the shock-absorbing support column 307 lifts the flange, the flange is disengaged from the slide rail 204, and the flange is close to the connecting sleeve 405. The bevel gear assembly B411 is driven to rotate by the motor. Under the action of the ball spline shaft 412, the air guide tube 404 rotates. Under the action of the thread on the inner wall of the sleeve A402, the air guide tube 404 spirals down. The sleeve B403 slides along the outer wall of the sleeve A402 under the action of the air guide tube 404. The brackets A407 and B408 rotate. The adjusting plate 406 engages and slides in the groove in the cross limit plate 401. The flange clamping plate 502 clamps the side wall of the flange. At the same time, the bottom of the connecting sleeve 405 is sealed to the top opening of the flange. When cylinder E506 retracts, trapezoidal guide plate 507 moves to guide air pipe 404, and extrusion bracket 504 rotates under the guidance of the side wall of trapezoidal guide plate 507. Pressing block 505 presses the upper and lower surfaces of flange to fix flange. The flange clamping plate 502 is tightly attached to the side wall of the flange. When the gas valve is opened, gas enters the flange. If there is a gap in the flange, the gas will leak into the gap between the flange clamping plate 502 and the flange. The pressure sensor on the flange clamping plate 502 generates a signal change under the action of pressure and transmits the signal to the central controller. Finally, the pressure change is displayed on the digital pressure gauge.

[0038] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0039] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the protection scope of the present invention.

Claims

1. A flange air tightness detection device, characterized in that: The system includes a cabinet (100), a flange feeding structure (200), a top cylinder lifting device (300), a progressive clamping assembly (400), and an airtightness testing clamp (500). The flange feeding structure (200), the top cylinder lifting device (300), and the progressive clamping assembly (400) are all snapped into place inside the cabinet (100). The flange feeding structure (200) slides and pulls against the side wall of the cabinet (100). The top cylinder lifting device (300) is located on the bottom wall of the cabinet (100). The progressive clamping assembly... (400) is snapped on the top wall of the cabinet (100), the air tightness detection clamp (500) is set on the progressive clamping assembly (400), and the side wall of the cabinet (100) is provided with a digital pressure gauge and a display screen; the progressive clamping assembly (400) includes a cross limit plate (401), sleeve A (402), sleeve B (403), guide air pipe (404), connecting sleeve (405), adjusting plate (406), bracket A (407), bracket B (408), and movable clamp (409).

2. The flange air tightness detection device according to claim 1, characterized in that: The cross-shaped limiting plate (401) is engaged and rotated within the cabinet (100). The sleeve A (402) is fixedly positioned at the center point of the cross-shaped limiting plate (401). The sleeve B (403) is engaged and installed on the outer wall of the sleeve A (402). The guide air pipe (404) is threadedly connected to the inner wall of the inner sleeve A (402). The connecting sleeve (405) is threadedly connected to the bottom wall of the guide air pipe (404). The movable locking block (409) is engaged and rotated within the cross-shaped limiting plate (100). The adjustment plate (406) is fixedly connected to the movable block (409) in the groove on the slide. The bracket A (407) and bracket B (408) are both hinged on the adjustment plate (406) and are parallel to each other. The bracket A (407) and bracket B (408) are both hinged on the outer wall of the sleeve B (403). The guide air pipe (404) is engaged and rotated on the bottom wall of the sleeve B (403).

3. The flange air tightness detection device according to claim 2, characterized in that: The progressive clamping assembly (400) further includes a bevel gear assembly A (410) and a bevel gear assembly B (411). The bevel gear assembly A (410) is fixedly mounted on the sleeve A (402). The inner wall of the bevel gear assembly B (411) is provided with a ball spline shaft (412). The ball spline shaft (412) engages and slides on the outer wall of the air guide tube (404). The bevel gear assembly B (411) drives the air guide tube (404) to rotate through the ball spline shaft (412), thereby causing the air guide tube (404) to slide along the thread on the inner wall of the sleeve A (402). The outer wall of the connecting sleeve (405) is provided with an annular airbag.

4. The flange airtightness testing device according to claim 3, characterized in that: The airtightness testing clamp (500) includes a connecting bracket (501), a flange clamping plate (502), a rotating slot (503), a pressing bracket (504), a pressing block (505), a cylinder E (506), and a trapezoidal guide plate (507). The connecting bracket (501) is engaged and slid within the adjusting plate (406). The connecting bracket (501) is slidably installed and fixed upward along the slot on the bottom wall of the adjusting plate (406). A plug is inserted into the slot on the adjusting plate (406) to limit the range of motion of the connecting bracket (501). The flange clamping plate (502) is fixedly connected to the connecting bracket (501). The rotating slot (503) is provided with... The extrusion bracket (504) is placed on the flange clamping plate (502) and rotates in the rotating slot (503). A torsion spring is provided at the engagement point between the rotating slot (503) and the extrusion bracket (504). The pressing block (505) is fixedly installed at one end of the extrusion bracket (504). The trapezoidal guide plate (507) is in contact with the other end of the extrusion bracket (504). The cylinder E (506) is fixedly installed on the side wall of the flange clamping plate (502). The telescopic part of the cylinder E (506) is fixedly connected to the trapezoidal guide plate (507). The contact edge between the extrusion bracket (504) and the trapezoidal guide plate (507) is rounded.

5. The flange airtightness testing device according to claim 4, characterized in that: The flange feeding structure (200) includes a feeding drawer (201), cylinder A (202), cylinder B (203), slide rail (204), slide groove A (205), slide groove B (206), limiting column (207), gear A (208), and rack B (209). The slide groove A (205) and slide groove B (206) are respectively installed on the front and rear baffles of the feeding drawer (201). The two ends of the slide rail (204) are engaged and slide within the slide groove A (205) and slide groove B (206), respectively. The limiting column (207) passes through the slot in the slide rail (204) and engages and slides within the slot. The gear A (208) is located at the rear of the feeding drawer (201). The baffle rotates and engages, and the rack B (209) slides and engages in the rear baffle of the loading drawer (201). The gear A (208) and the rack B (209) mesh with each other. The rack B (209) is fixedly connected to the slide rail (204). The cylinder B (203) is fixedly installed on the front and rear baffles of the loading drawer (201). The telescopic part of the cylinder B (203) is fixedly connected to the limiting column (207). The cylinder A (202) is fixedly installed on the inner wall of the cabinet (100). The telescopic part of the cylinder A (202) is fixedly connected to the bottom wall of the loading drawer (201). The side wall of the loading drawer (201) is provided with a downward-opening convex rail (210).

6. The flange airtightness testing device according to claim 5, characterized in that: The top cylinder lifting device (300) includes a rigid pipe (301), a telescopic hose (302), a cylinder C (303), a cylinder D (304), a support plate C (305), a support plate D (306), and a shock-absorbing support column (307). The cylinders C (303) and D (304) are fixed on the bottom wall of the cabinet (100). The support plates C (305) and D (306) are fixedly connected to the telescopic parts of the cylinders C (303) and D (304), respectively. The telescopic hose (302) is installed on the bottom wall of the support plate C (305). The rigid pipe (301) is installed on the top wall of the support plate C (305) by means of threaded connection, and the rigid pipe (301) is connected to the telescopic hose (302). The shock-absorbing support column (307) is fixedly installed on the top wall of the support plate D (306).

7. The flange airtightness testing device according to claim 6, characterized in that: A camera is provided on the top wall of the tray C (305); an annular airbag is provided on the side wall of the rigid tube (301).

8. The flange airtightness testing device according to claim 7, characterized in that: A pressure sensor is provided on the flange clamping plate (502).

9. A flange airtightness testing device according to claim 8, characterized in that: The limiting column (207) is higher than the feeding drawer (201). A hinge plate (101) is provided at the upper end of the inlet and outlet of the feeding drawer (201). The hinge plate (101) deflects when the feeding drawer (201) slides in and out.

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