A differential pressure airtightness leak detection device

Abstract

The present invention relates to the technical field of airtightness leak detection, and discloses a differential pressure airtightness leak detection device, comprising a frame, a soft tank body arranged on the frame, and an airtightness detection mechanism, wherein a positioning mechanism is also arranged on the frame; the positioning mechanism comprises a positioning seat arranged on the frame, a fixing ring fixed on the positioning seat, and a sleeve ring rotatably arranged outside the fixing ring, and a force-applying mechanism for simulating dynamic detection of the soft tank body is arranged on the fixing ring; the force-applying mechanism comprises a first guide rod symmetrically arranged on both sides of the soft tank body, and a second guide rod equidistantly distributed around the soft tank body, an extrusion block for extruding the soft tank body is fixed at one end of the first guide rod close to the soft tank body, and a conical abutment head for abutting the soft tank body is fixed at one end of the second guide rod close to the soft tank body. The differential pressure airtightness leak detection device helps the detection device identify potential leakage point problems caused by dynamic loads by applying pressure in a dynamic environment to the soft tank body.

Description

Technical Field

[0001] The invention relates to the technical field of airtightness leak detection, and in particular to a differential pressure airtightness leak detection device. Background Art

[0002] In modern industrial applications, the demand for air tightness testing is increasing, especially in the field of handling and storing liquid and gas containers. Among them, the air tightness of the tank body, as an important storage and transportation tool, directly affects the safety of materials and production efficiency. Differential pressure air tightness leak detection equipment has obvious advantages in detecting the air tightness of the tank body. By applying gas pressure to the tank body and monitoring the pressure changes, the location and extent of the leak can be accurately identified.

[0003] The existing publication number CN116046278A discloses a gas-filled tank weld air tightness detection device and method, which include a mounting frame, a positioning ring, a detection ring and a support plate. The positioning ring is arranged in the mounting frame to rotate up and down, the detection ring is fixed in the mounting frame, and the support plate is arranged in the mounting frame to float up and down. The positioning ring is located at the upper part of the detection ring, and the floating range of the support plate passes through the upper and lower sides of the detection ring. The detection ring is provided with an annular groove for wrapping the annular weld of the tank to be detected, and the annular groove is divided into multiple detection chambers in the circumferential direction. A leakage marking mechanism is provided on the detection ring outside each detection chamber.

[0004] Although the above technical solution can leave a mark on the tank body through the leak marking mechanism, and has the advantage of automatically marking the leak point, in the prior art, when the differential pressure airtightness leak detection device detects the tank body, the tank body needs to be fixed in a sealed test environment, and the pressure difference between the inside and outside of the tank body is changed, and the pressure change is monitored by a pressure sensor to determine whether there is a leak in the tank body;

[0005] However, when the existing differential pressure airtightness leak detection equipment is used to detect the soft tank body, the soft tank body often needs to be used under dynamic conditions. For example, during transportation, loading and unloading operations or in actual use, the tank body may leak due to pressure changes, vibrations or other external forces in a dynamic environment, thereby affecting its airtightness. Since the existing differential pressure airtightness leak detection equipment usually requires the soft tank body to be in a static state for detection, its applicability under these dynamic conditions is limited, and it is unable to adapt to and monitor the airtightness of the soft tank body in motion. Therefore, a new type of differential pressure airtightness leak detection equipment is needed to solve the above problems. Summary of the invention

[0006] The purpose of the present invention is to provide a differential pressure airtightness leak detection device to solve the problem that the existing differential pressure airtightness leak detection device mentioned in the above background technology usually requires the soft tank body to be in a static state and cannot adapt to and monitor the airtightness of the soft tank body in a moving state.

[0007] The present invention provides a differential pressure airtightness leak detection device, which adopts the following scheme:

[0008] A differential pressure airtightness leak detection device comprises a frame, a soft tank body arranged on the frame, and an airtightness detection mechanism, wherein the airtightness detection mechanism comprises a booster pump, a sealing and inflating head for sealing and inflating the soft tank body, a booster pipe for connecting the booster pump and the sealing and inflating head, and a cylinder arranged on the frame for lifting and lowering the sealing and inflating head, and a positioning mechanism is also arranged on the frame;

[0009] The positioning mechanism includes a positioning seat arranged on the frame, a fixing ring fixed on the positioning seat, and a sleeve ring rotatably arranged outside the fixing ring, the positioning seat is provided with a positioning groove for positioning the soft tank body, and the fixing ring is provided with a force applying mechanism for simulating dynamic detection of the soft tank body;

[0010] The force-applying mechanism comprises first guide rods symmetrically arranged on both sides of the soft tank body, second guide rods equidistantly distributed around the soft tank body, and connecting rods for supporting the first guide rods and the second guide rods, an extrusion block for extruding the soft tank body is fixed at one end of the first guide rod close to the soft tank body, and a conical abutment head for abutting the soft tank body is fixed at one end of the second guide rod close to the soft tank body;

[0011] The first guide rod and the second guide rod are used alternately. When the first guide rod drives the extrusion block to extrude the soft tank body, the second guide rod drives the conical abutment head to remain stationary. When the second guide rod drives the conical abutment head to abut the soft tank body, the first guide rod drives the extrusion block to remain stationary.

[0012] Furthermore, a regulating mechanism is provided in the fixing ring, and the regulating mechanism includes an empty slot opened in the fixing ring and corresponding to the connecting rod one by one, a shaft sleeve fixed in the empty slot, a shaft rod rotatably arranged in the shaft sleeve, an abutting rod fixed on the shaft rod, and a connecting column limitedly inserted in the empty slot;

[0013] A notch is formed at one end of the connecting column close to the shaft rod, one side of the notch is an inclined surface, and one end of the abutting rod away from the shaft rod is in sliding contact with the inclined surface;

[0014] One end of the connecting column away from the shaft rod is fixed to the connecting rod, and the connecting rod is movably inserted in the corresponding empty slot and is provided with a first spring.

[0015] Furthermore, one end of the shaft rod away from the connecting column passes through the outside of the fixed ring and is fixed with a swing arm, and one end of the swing arm away from the shaft rod is rotatably provided with a shaft block, and the sleeve ring is provided with guide grooves corresponding to the shaft blocks, and the shaft blocks are slidably connected in the corresponding guide grooves;

[0016] The guide groove comprises an arc segment and a parallel segment, wherein the guide groove corresponding to the first guide rod position and the guide groove corresponding to the second guide rod position are in opposite directions.

[0017] Furthermore, a driving mechanism is provided on the collar, and the driving mechanism includes an arc-shaped rack plate fixed outside the collar and a gear meshingly connected to the arc-shaped rack plate. The gear is rotatably arranged on the frame via a rotating shaft, and a handle is fixed on the rotating shaft.

[0018] Furthermore, a slider is fixed on the connecting column, and the slider moves within a limited position in the empty slot.

[0019] Furthermore, the movable sleeve on the second guide rod is provided with an annular abutment joint, and the annular abutment joint is provided with a groove matched with the conical abutment joint.

[0020] Furthermore, a threaded sleeve is provided on the second guide rod through a threaded sleeve, and the threaded sleeve is fixed to the annular abutment joint.

[0021] Furthermore, a limiting ring for limiting the position of the threaded sleeve is fixed on the second guide rod.

[0022] Furthermore, a support seat is fixed to one end of the connecting rod away from the connecting column, and a bolt is threadedly connected to the support seat. The first guide rod and the second guide rod respectively penetrate the corresponding support seats, and the first guide rod and the second guide rod are both provided with multiple groups of screw holes that are compatible with the bolts.

[0023] Furthermore, a plurality of groups of clamping blocks for positioning the soft can body are equidistantly arranged in the positioning groove, a plug rod is fixed on the clamping block, the plug rod is limitedly inserted in a slot provided in the positioning seat, and a second spring is also arranged on the plug rod.

[0024] Beneficial effects of the present invention:

[0025] 1. By providing a force-applying mechanism, a regulating mechanism and a driving mechanism, and by utilizing the cooperation of the extrusion block and the conical abutment joint in the force-applying mechanism, the extrusion or impact force that the soft tank body may be subjected to in actual use can be simulated. By utilizing the driving mechanism to control the rotation of the collar, and through the action of the regulating mechanism, the clockwise rotation or counterclockwise rotation of the collar can respectively control the conical abutment joint or the extrusion block to approach the soft tank body. The conical abutment joint or the extrusion block can apply pressure to the soft tank body in a dynamic environment, thereby helping the detection equipment to identify potential leakage points caused by dynamic loads. The extrusion block and the conical abutment joint simulating the action of external force can effectively improve the overall performance of the detection equipment, thereby improving the flexibility and accuracy of the detection equipment.

[0026] 2. By providing an annular abutment, a slot and a screw sleeve, and by using conical abutments and annular abutments of different areas, different external force conditions that the soft tank body may encounter during actual use can be simulated. The large-area annular abutment can increase the distribution of external force applied to the soft tank body, while the small-area conical abutment can simulate concentrated pressure, thereby improving the accuracy of detection.

[0027] 3. By providing a support seat and a bolt, the positions of the first guide rod and the second guide rod can be adjusted by utilizing the action of the bolt, so that the extrusion force applied to the soft tank body can be adjusted. Changing the extrusion force can simulate the force performance of the soft tank body in different use environments, thereby improving the reliability of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0029] Figure 2 For the present invention Figure 1 Schematic diagram of the three-dimensional structure of the middle frame, positioning mechanism, force-applying mechanism and soft tank body;

[0030] Figure 3 For the present invention Figure 2 Schematic diagram of the three-dimensional structure of the central positioning mechanism, the force-applying mechanism and the soft tank body;

[0031] Figure 4 For the present invention Figure 3 Schematic diagram of the three-dimensional structure of the middle positioning seat, the fixing ring, the first guide rod, the second guide rod and the soft tank body;

[0032] Figure 5 It is a schematic cross-sectional view of the three-dimensional structure of the fixing ring of the present invention;

[0033] Figure 6 For the present invention Figure 5 A schematic cross-sectional view of the three-dimensional structure of the fixing ring and the regulating mechanism;

[0034] Figure 7 It is a three-dimensional schematic diagram of the second guide rod, connecting rod, shaft rod, abutment rod, connecting column, inclined plane, first spring, swing arm and shaft block of the present invention;

[0035] Figure 8 It is a schematic diagram of the top view of the structure of the soft tank body, the fixing ring, the sleeve ring, the first guide rod and the second guide rod of the present invention;

[0036] Fig. 9 It is a three-dimensional structural schematic diagram showing the extrusion state of the conical abutment head of the present invention;

[0037] Fig.10 It is a schematic diagram showing the three-dimensional structure of the extrusion block of the present invention in abutment state;

[0038] Fig.11 It is a schematic diagram of the top view of the structure of the switching state of the extrusion block and the tapered abutment head of the present invention;

[0039] Fig.12 For the present invention Figure 7 Schematic diagram of the three-dimensional structure of the middle annular abutment joint in the moving state;

[0040] Fig.13 It is a schematic diagram of the three-dimensional structure of the second guide rod, the screw sleeve and the annular abutment joint in the explosion state of the present invention;

[0041] Fig.14 It is a schematic side view of the cross-sectional structure of the positioning seat, the fixing ring and the soft tank body of the present invention.

[0042] In the figure:

[0043] 1. Frame; 11. Soft tank; 2. Air tightness detection mechanism; 21. Booster pump; 22. Sealed air filling head; 23. Booster pipe; 24. Cylinder; 3. Positioning mechanism; 31. Positioning seat; 311. Positioning groove; 312. Clamping block; 313. Insertion rod; 314. Slot; 315. Second spring; 32. Fixing ring; 33. Ring; 331. Guide groove; 3311. Arc segment; 3312. Parallel segment; 4. Force-applying mechanism; 41. First guide rod; 411. Extrusion block; 42. Second guide Rod; 421, conical abutment; 422, annular abutment; 423, slot; 424, screw sleeve; 425, limit ring; 43, connecting rod; 431, support seat; 432, bolt; 5, regulating mechanism; 51, empty slot; 52, bushing; 53, shaft rod; 54, abutment rod; 55, connecting column; 551, slider; 56, inclined plane; 57, first spring; 58, swing arm; 59, shaft block; 6, driving mechanism; 61, arc-shaped rack plate; 62, gear; 63, rotating shaft; 64, handle. DETAILED DESCRIPTION

[0044] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0045] Reference Figure 1A differential pressure airtightness leak detection device comprises a frame 1, a soft tank body 11 arranged on the frame 1, and an airtightness detection mechanism 2 for airtightness detection of the soft tank body 11, the airtightness detection mechanism 2 comprises a booster pump 21, a sealing and inflating head 22 for sealing and inflating the soft tank body 11, a booster pipe 23 for connecting the booster pump 21 and the sealing and inflating head 22, and a cylinder 24 arranged on the frame 1 for lifting and lowering the sealing and inflating head 22, a positioning mechanism 3 comprises a positioning seat 31 arranged on the frame 1, a fixing ring 32 fixed on the positioning seat 31, and a sleeve ring 33 rotatably arranged outside the fixing ring 32, a positioning groove 311 for positioning the soft tank body 11 is provided on the positioning seat 31, wherein the specific composition and specific principle of the booster pump 21, the sealing and inflating head 22, the booster pipe 23 and the cylinder 24 are the prior art well known in the art, so they will not be described in detail here,

[0046] Reference Figure 1-Figure 4 The fixing ring 32 is provided with a force-applying mechanism 4 for simulating dynamic detection of the soft tank body 11. The force-applying mechanism 4 includes a first guide rod 41 symmetrically arranged on both sides of the soft tank body 11, a second guide rod 42 equidistantly distributed around the soft tank body 11, and a connecting rod 43 for supporting the first guide rod 41 and the second guide rod 42. An extrusion block 411 for extruding the soft tank body 11 is fixed at one end of the first guide rod 41 close to the soft tank body 11, and a conical abutment head 421 for abutting the soft tank body 11 is fixed at one end of the second guide rod 42 close to the soft tank body 11. The first guide rod 41 and the second guide rod 42 are switched for use. When the first guide rod 41 drives the extrusion block 411 to extrude the soft tank body 11, the second guide rod 42 drives the conical abutment head 421 to remain stationary. When the second guide rod 42 drives the conical abutment head 421 to abut the soft tank body 11, the first guide rod 41 drives the extrusion block 411 to remain stationary. The arrangement of the extrusion block 411 and the conical abutment head 421 can simulate the external force that the soft tank body 11 may encounter in actual use, such as extrusion or impact during transportation. By simulating these actual conditions, the comprehensiveness and accuracy of the detection are improved.

[0047] Specifically, refer to Figure 2-Figure 11The fixing ring 32 is provided with a regulating mechanism 5, which is used to control the connecting rod 43 to drive the first guide rod 41 or the second guide rod 42 to approach the soft tank body 11. The regulating mechanism 5 includes an empty groove 51 opened in the fixing ring 32 and corresponding to the connecting rod 43, a sleeve 52 fixed in the empty groove 51, a shaft rod 53 rotatably arranged in the sleeve 52, an abutting rod 54 fixed on the shaft rod 53, and a connecting column 55 limitedly inserted in the empty groove 51, wherein a notch is opened at one end of the connecting column 55 close to the shaft rod 53, and one side of the notch is an inclined surface 56. The end of the abutment rod 54 away from the shaft rod 53 is in sliding contact with the inclined surface 56, and the end of the connecting column 55 away from the shaft rod 53 is fixed to the connecting rod 43. The connecting rod 43 is movably inserted in the corresponding empty groove 51 and is provided with a first spring 57. The two ends of the first spring 57 are respectively fixed between the connecting column 55 and the empty groove 51. The rotation of the shaft rod 53 is used to squeeze the inclined surface 56, so that the connecting column 55 drives the connecting rod 43 to move toward the soft tank body 11, so that the first guide rod 41 or the second guide rod 42 approaches the soft tank body 11 and applies force.

[0048] Specific reference Figure 7 A slider 551 is fixed on the connecting column 55 , and the slider 551 moves within the empty slot 51 . The connecting column 55 can be limited by the slider 551 , so that the connecting column 55 can move smoothly within the empty slot 51 .

[0049] Specific reference Figure 6 The end of the shaft rod 53 away from the connecting column 55 passes through the outside of the fixing ring 32 and is fixed with a swing arm 58. The end of the swing arm 58 away from the shaft rod 53 is rotatably provided with a shaft block 59;

[0050] Specific reference Figure 3 The collar 33 is provided with a guide groove 331 corresponding to the shaft block 59 one by one, and the shaft block 59 is slidably connected in the corresponding guide groove 331. Specifically, the guide groove 331 includes an arc segment 3311 and a parallel segment 3312, and the arc segment 3311 and the parallel segment 3312 are connected through. The initial state of the shaft block 59 is at the connection between the arc segment 3311 and the parallel segment 3312, wherein the guide groove 331 corresponding to the position of the first guide rod 41 and the guide groove 331 corresponding to the position of the second guide rod 42 are in opposite directions. By controlling the rotation of the collar 33, the shaft block 59 slides along the guide groove 331. When the shaft block 59 slides in the corresponding arc segment 3311, the shaft block 59 can drive the corresponding swing arm 58, the shaft rod 53 and the abutment rod 54 to rotate along the guidance of the arc segment 3311. When the shaft block 59 slides in the parallel segment 3312, the swing arm 58 remains stationary.

[0051] Further, see Figure 2 and Figure 8A driving mechanism 6 is provided on the collar 33, and the driving mechanism 6 includes an arc-shaped rack plate 61 fixed outside the collar 33 and a gear 62 meshingly connected with the arc-shaped rack plate 61. The gear 62 is rotatably arranged on the frame 1 through a rotating shaft 63, and a handle 64 is fixed on the rotating shaft 63. By controlling the rotation of the handle 64, the collar 33 is driven to rotate through the gear 62, which can facilitate the operator to operate.

[0052] During use: first, the soft tank body 11 to be monitored is placed in the positioning groove 311, and the cylinder 24 is used to control the sealing and inflating head 22 to descend, and the port of the soft tank body 11 is pressed and sealed. Then, the booster pump 21, the sealing and inflating head 22 and the booster pipe 23 are used to perform gas transmission detection in the soft tank body 11. During the detection process, the handle 64 is held and controlled to rotate, and the handle 64 is used to drive the rotating shaft 63 and the gear 62 to rotate, so that the gear 62 drives the arc-shaped rack plate 61 and the collar 33 to rotate;

[0053] When the collar 33 rotates clockwise, the shaft block 59 corresponding to the position of the second guide rod 42 slides in the corresponding guide groove 331, and through the guiding effect of the corresponding arc segment 3311, the corresponding swing arm 58 rotates clockwise, and at the same time drives the abutment rod 54 to rotate. During the rotation of the abutment rod 54, it slides on the inclined surface 56 and abuts against the inclined surface 56, thereby squeezing the connecting column 55 to move toward the soft tank body 11. At this time, the connecting column 55 drives the connecting rod 43 and the second guide rod 42 toward the soft tank body 11. The second guide rod 42 drives the conical abutment head 421 to abut and press the surrounding of the soft tank body 11, thereby simulating the external force impact that the soft tank body 11 may encounter in actual use. At the same time, the shaft block 59 corresponding to the position of the first guide rod 41 translates and slides in the corresponding parallel section 3312, and the first guide rod 41 remains stationary. When the collar 33 rotates and resets, the connecting rod 43 drives the corresponding second guide rod 42 and the conical abutment head 421 to reset under the elastic control of the first spring 57. For details, please refer to Fig. 9 and Fig.11 ;

[0054] When the collar 33 rotates counterclockwise, the shaft block 59 corresponding to the position of the first guide rod 41 slides in the corresponding guide groove 331, and through the guiding effect of the corresponding arc segment 3311, the corresponding swing arm 58 rotates counterclockwise, and at the same time drives the abutment rod 54 to rotate, the abutment rod 54 rotates and slides on the inclined surface 56, thereby squeezing the corresponding connecting column 55 to drive the connecting rod 43 and the first guide rod 41 to move toward the soft tank body 11, squeezing both sides of the soft tank body 11, thereby simulating the squeezing force that the soft tank body 11 may encounter in actual use, and at the same time, the shaft block 59 corresponding to the position of the second guide rod 42 slides in the corresponding parallel segment 3312, and the second guide rod 42 remains stationary. When the collar 33 is rotated and reset, the first spring 57 is used to reset the first guide rod 41 and the squeezing block 411. For details, please refer to Fig.10 and Fig.11 .

[0055] Further, see Figure 12-13 The second guide rod 42 is movably provided with an annular abutment joint 422, and the annular abutment joint 422 is provided with a groove 423 adapted to the conical abutment joint 421. The outer surface of the second guide rod 42 is provided with an external thread groove, and a screw sleeve 424 is provided on the second guide rod 42 through a thread sleeve. By controlling the rotation of the screw sleeve 424, the screw sleeve 424 can drive the annular abutment joint 422 to move on the outer surface of the second guide rod 42. When the annular abutment joint 422 moves toward the direction of the soft tank body 11, the conical abutment joint 421 can abut against the soft tank body 11. By using conical abutment joints 421 and annular abutment joints 422 of different areas, different external force conditions that the soft tank body 11 may encounter during actual use can be simulated. The large-area annular abutment joint 422 can increase the external force distribution applied to the soft tank body 11, while the small-area conical abutment joint 421 can simulate concentrated pressure, thereby improving the accuracy of detection. The screw sleeve 424 is fixed to the annular abutment joint 422, and a limiting ring 425 for limiting the screw sleeve 424 is fixed on the second guide rod 42, thereby preventing the annular abutment joint 422 from detaching from the second guide rod 42.

[0056] During use, the annular abutment head 422 is moved on the surface of the second guide rod 42 by rotating the screw sleeve 424. When the second guide rod 42 moves toward the soft tank body 11, the annular abutment head 422 can abut against the soft tank body 11. When the second guide rod 42 moves in the opposite direction, the conical abutment head 421 is exposed, so that the conical abutment head 421 abuts against the soft tank body 11 more concentratedly.

[0057] Further, see Fig.12A support seat 431 is fixed to one end of the connecting rod 43 away from the connecting column 55, and a bolt 432 is threadedly connected to the support seat 431. The first guide rod 41 and the second guide rod 42 respectively penetrate the corresponding support seats 431, wherein the first guide rod 41 and the second guide rod 42 are both provided with a plurality of screw holes adapted to the bolts 432. By controlling the first guide rod 41 and the second guide rod 42 to approach the soft tank body 11 or to move away from the soft tank body 11, the force when squeezing the soft tank body 11 or impacting the soft tank body 11 can be further increased, so that the air tightness test of the soft tank body 11 to be tested can be performed under different pressures, thereby further improving the detection accuracy.

[0058] During use, the bolt 432 is rotated to disengage from the corresponding screw hole, and then the first guide rod 41 or the second guide rod 42 is moved in the corresponding support seat 431 to make the first guide rod 41 and the second guide rod 42 approach the soft tank body 11 or move away from the soft tank body 11, and then the bolt 432 is rotated again to rotate the bolt 432 into the corresponding screw hole, thereby fixing the position of the first guide rod 41 or the second guide rod 42.

[0059] Among them, refer to Fig.14 A plurality of groups of clamping blocks 312 for positioning the soft tank body 11 are arranged at equal distances in the positioning groove 311. The top of the clamping block 312 close to the soft tank body 11 is inclined for guiding the soft tank body 11 to be inserted into the positioning groove 311. A plug rod 313 is fixed on the clamping block 312. The plug rod 313 is limitedly inserted in a slot 314 provided in the positioning seat 31. A second spring 315 is also arranged on the plug rod 313. When the soft tank body 11 is placed in the positioning groove 311, it can be positioned by the clamping block 312. The elastic action of the second spring 315 enables the clamping block 312 to clamp the soft tank body 11 to prevent the soft tank body 11 from shaking, thereby improving the stability of the detection.

[0060] During use, when the soft can body 11 to be tested needs to be placed, the bottom of the soft can body 11 is first inserted into the positioning groove 311. At this time, the bottom end of the soft can body 11 contacts the inclined side of the clamping block 312 and moves against the clamping block 312, so that the insertion rod 313 moves toward the slot 314. When the soft can body 11 is completely placed, the elastic action of the second spring 315 causes the clamping block 312 to clamp and position the soft can body 11.

[0061] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A differential pressure airtightness leak detection device, comprising a frame (1), a soft tank body (11) arranged on the frame (1), and an airtightness detection mechanism (2), wherein the airtightness detection mechanism (2) comprises a booster pump (21), a sealing and inflating head (22) for sealing and inflating the soft tank body (11), a booster pipe (23) for connecting the booster pump (21) and the sealing and inflating head (22), and a cylinder (24) arranged on the frame (1) for lifting and lowering the sealing and inflating head (22), characterized in that: The frame (1) is also provided with a positioning mechanism (3); The positioning mechanism (3) comprises a positioning seat (31) arranged on the frame (1), a fixing ring (32) fixed on the positioning seat (31), and a sleeve ring (33) rotatably arranged outside the fixing ring (32); the positioning seat (31) is provided with a positioning groove (311) for positioning the soft tank body (11); and the fixing ring (32) is provided with a force applying mechanism (4) for performing simulated dynamic detection on the soft tank body (11); The force applying mechanism (4) comprises first guide rods (41) symmetrically arranged on both sides of the soft tank body (11), second guide rods (42) equidistantly distributed around the soft tank body (11), and a connecting rod (43) for supporting the first guide rod (41) and the second guide rod (42); an extrusion block (411) for extruding the soft tank body (11) is fixed to one end of the first guide rod (41) close to the soft tank body (11); and a conical abutment head (421) for abutting the soft tank body (11) is fixed to one end of the second guide rod (42) close to the soft tank body (11); The first guide rod (41) and the second guide rod (42) are used alternately. When the first guide rod (41) drives the extrusion block (411) to extrude the soft tank body (11), the second guide rod (42) drives the conical abutment head (421) to remain stationary. When the second guide rod (42) drives the conical abutment head (421) to abut the soft tank body (11), the first guide rod (41) drives the extrusion block (411) to remain stationary. The fixing ring (32) is provided with a regulating mechanism (5), the regulating mechanism (5) comprising a hollow groove (51) provided in the fixing ring (32) and corresponding to the connecting rod (43), a shaft sleeve (52) fixed in the hollow groove (51), a shaft rod (53) rotatably arranged in the shaft sleeve (52), an abutting rod (54) fixed on the shaft rod (53), and a connecting column (55) limitedly inserted in the hollow groove (51); A notch is formed at one end of the connecting column (55) close to the shaft rod (53), one side of the notch is an inclined surface (56), and an end of the abutting rod (54) away from the shaft rod (53) is in sliding contact with the inclined surface (56); One end of the connecting column (55) away from the shaft rod (53) is fixed to the connecting rod (43); the connecting rod (43) is movably inserted into the corresponding empty slot (51) and is provided with a first spring (57); One end of the shaft rod (53) away from the connecting column (55) passes through the outside of the fixing ring (32) and is fixed with a swing arm (58); one end of the swing arm (58) away from the shaft rod (53) is rotatably provided with a shaft block (59); the sleeve ring (33) is provided with guide grooves (331) corresponding to the shaft blocks (59); the shaft blocks (59) are slidably connected in the corresponding guide grooves (331); The guide groove (331) comprises an arc segment (3311) and a parallel segment (3312), wherein the guide groove (331) corresponding to the position of the first guide rod (41) and the guide groove (331) corresponding to the position of the second guide rod (42) are in opposite directions; The collar (33) is provided with a driving mechanism (6), the driving mechanism (6) comprising an arc-shaped rack plate (61) fixed outside the collar (33) and a gear (62) meshingly connected with the arc-shaped rack plate (61), the gear (62) being rotatably arranged on the frame (1) via a rotating shaft (63), and a handle (64) being fixed on the rotating shaft (63).

2. The differential pressure airtightness leak detection device according to claim 1, characterized in that: A slider (551) is fixed on the connecting column (55), and the slider (551) moves within a limited position in the empty slot (51).

3. The differential pressure airtightness leak detection device according to claim 1, characterized in that: An annular abutment joint (422) is movably sleeved on the second guide rod (42), and a slot (423) matching the conical abutment joint (421) is formed on the annular abutment joint (422).

4. The differential pressure airtightness leak detection device according to claim 3, characterized in that: A threaded sleeve (424) is provided on the second guide rod (42) via a threaded sleeve, and the threaded sleeve (424) is fixed to the annular abutment joint (422).

5. The differential pressure airtightness leak detection device according to claim 4, characterized in that: A limiting ring (425) for limiting the position of the screw sleeve (424) is fixed on the second guide rod (42).

6. The differential pressure airtightness leak detection device according to claim 1, characterized in that: A support seat (431) is fixed to one end of the connecting rod (43) away from the connecting column (55), and a bolt (432) is threadedly connected to the support seat (431). The first guide rod (41) and the second guide rod (42) respectively penetrate the corresponding support seat (431), wherein the first guide rod (41) and the second guide rod (42) are both provided with a plurality of groups of screw holes adapted to the bolts (432).

7. The differential pressure airtightness leak detection device according to claim 1, characterized in that: A plurality of groups of clamping blocks (312) for positioning the soft can body (11) are arranged at equal distances in the positioning groove (311), an insertion rod (313) is fixed on the clamping block (312), the insertion rod (313) is limitedly inserted in a slot (314) provided in the positioning seat (31), and a second spring (315) is also provided on the insertion rod (313).

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