A clamp for air tightness testing

Abstract

This invention belongs to the field of testing fixtures, and specifically relates to a fixture for airtightness testing, including a clamping assembly, on which a fastening assembly is fixedly installed. The clamping assembly includes a first housing, within which a cylindrical pin is fixedly installed. A first support frame is also slidably installed within the first housing. A first clamping unit and a second clamping unit are rotatably installed on the first support frame. The cylindrical pin can drive the first and second clamping units to achieve rapid opening and closing of the fixture, directly reaching the maximum engagement depth for clamping operations, significantly reducing the operation time for tightening threads and improving work efficiency. The fastening assembly includes a top cover, with a side cover fixedly installed at the bottom of the top cover. A fastening unit is fixedly installed within the side cover. The fastening unit can press the first and second clamping units to achieve secondary fastening, providing sufficient clamping force to ensure good sealing performance of the fixture when clamping branch pipes.

Description

Technical Field

[0001] This invention belongs to the field of testing fixtures, and specifically relates to a fixture for airtightness testing. Background Technology

[0002] Currently, for hollow devices that require airtightness testing, especially stainless steel water separators, the airtightness test is conducted by filling the internal space of the test object with air and then measuring the air pressure drop to check for air leakage and the amount of leakage, thereby determining the airtightness performance of the test object.

[0003] During the airtightness test of a stainless steel manifold, it is necessary to seal the branch pipe connecting the inside and outside of the manifold. This branch pipe is cylindrical and has external threads on its outer circumference. Existing clamps require the operator to engage the internal thread of the clamp with the external thread of the branch pipe, then continuously rotate the clamp to screw the branch pipe into the clamp until the open end of the branch pipe abuts against the sealing part of the clamp, thus sealing the branch pipe. However, stainless steel manifolds often have multiple branch pipes. During the airtightness test, each branch pipe requires the installation of the aforementioned clamp, and each clamp on each branch pipe requires tightening all its threads, wasting considerable time and resulting in low clamping efficiency. Furthermore, manually tightening the threads cannot guarantee that the rotation angle and torque remain consistent during each clamp insertion operation, easily causing deviations in the engagement state between the clamp and the branch pipe threads, generating additional test variables and affecting the test results. Summary of the Invention

[0004] This invention proposes a clamp for airtightness testing, which is equipped with a clamping component that can be opened and closed quickly. The clamp can directly reach the predetermined engagement depth required for airtightness testing. It is also equipped with a fastening component to ensure that the clamp has good sealing performance for the branch pipe under test.

[0005] The technical solution of this invention is implemented as follows:

[0006] A clamp for airtightness testing includes a clamping assembly with a fastening assembly fixedly mounted on it. The clamping assembly includes a first handle, a first housing fixedly mounted at the bottom of the first handle, a cylindrical pin fixedly mounted inside the first housing, and a first support frame slidably mounted inside the first housing. A first clamping unit and a second clamping unit are rotatably mounted on the first support frame. When the cylindrical pin moves downward, it can cause the first and second clamping units to move closer together; when the cylindrical pin moves upward, it can cause the first and second clamping units to move away from each other. A receiving cylinder is fixedly mounted at the bottom of the first support frame. A thrust needle roller, a thrust washer, and a rubber seal are sequentially mounted from top to bottom inside the receiving cylinder. When the first and second clamping units clamp, the... The first clamping unit and the second clamping unit can fit tightly against the outer wall of the receiving cylinder; the fastening assembly includes a top cover, a side cover is fixedly installed at the bottom of the top cover, a fastening unit is fixedly installed inside the side cover, the fastening unit is provided with a chassis, the chassis is fixedly installed on the receiving cylinder, a turntable is rotatably connected to the chassis, a plurality of fastening plates are slidably arranged between the turntable and the chassis, an elastic pad is fixedly arranged on the side wall of the fastening plate near the clamping assembly, an annular rack is fixedly arranged on the side wall of the turntable, the annular rack is meshed with an actuation unit that can drive the turntable to rotate, the turntable can drive the plurality of fastening plates to slide on the chassis to press the first clamping unit and the second clamping unit, when the fastening unit is pressed, the elastic pad undergoes elastic change, and the actuation unit remains locked on the side cover.

[0007] In a preferred embodiment of the present invention, the first support frame includes a first guide block, the sidewall of the first guide block being in contact with the inner wall of the first housing, a support plate being fixedly installed at the bottom of the first guide block, a sliding groove being formed through the support plate, a cylindrical pin passing through the sliding groove, a circular groove being formed on the support plate, a first cylindrical pin being formed through the circular groove, a first clamping unit and a second clamping unit rotating around the first cylindrical pin, a support plate being fixedly installed at the bottom of the support plate, anti-slip grooves being formed on both sides of the support plate, the first clamping unit and the second clamping unit rotating within the anti-slip grooves, a connecting block being fixedly installed at the bottom of the support plate, a pin hole being formed on the connecting block, a second cylindrical pin being formed through the pin hole, a receiving cylinder being fixed to the connecting block by the second cylindrical pin, a thrust needle roller, a thrust washer and a rubber seal being sleeved and installed at the bottom of the connecting block, a second support frame being fixed to the receiving cylinder by the second cylindrical pin, and a chassis being fixedly installed on the top of the second support frame.

[0008] In a preferred embodiment of the present invention, the first clamping unit includes a first connecting plate, on which a first elongated hole and a first through hole are formed. A first clamping block is fixedly disposed at the bottom of the first connecting plate, and a first pressure block is fixedly installed on the first clamping block. The first elongated hole is obliquely downward facing inward, and an arc-shaped first clamping groove is provided at the bottom of the first clamping block. The second clamping unit includes a second connecting plate, on which a second elongated hole and a second through hole are formed. A second clamping block is fixedly disposed at the bottom of the second connecting plate, and a second pressure block is fixedly installed on the second clamping block. The second elongated hole is obliquely downward facing inward, and an arc-shaped second clamping groove is provided at the bottom of the second clamping block. Internal threads are formed on the surfaces of the first clamping groove and the second clamping groove. The first cylindrical pin passes through the first through hole and the second through hole. The first connecting plate and the second connecting plate can rotate around the first cylindrical pin in the anti-slip groove. When the bottom walls of the first elongated hole and the second elongated hole abut against the cylindrical pin, the first clamping block and the second clamping block achieve clamping.

[0009] In a preferred embodiment of the present invention, both the first pressure block and the second pressure block are arc-shaped plates. When the fastening unit is pressed, the arc-shaped surfaces of the first pressure block and the second pressure block abut against the inner surfaces of the plurality of fastening plates, and the top surfaces of the first pressure block and the second pressure block are flush with the top surfaces of the fastening plates.

[0010] In a preferred embodiment of the present invention, both the turntable and the chassis are annular. The turntable has a guide groove, and a driving column is fixedly installed at the bottom of the turntable. The top of the fastening plate has a first groove corresponding to the driving column, and the driving column slides in the first groove. A slider is fixedly installed at the bottom of the fastening plate, and a second groove is opened at the top of the chassis, and the slider slides in the second groove. A second guide block and a bearing are also installed at the top of the chassis. The second guide block passes through the guide groove, and the starting unit is rotatably mounted on the bearing.

[0011] In a preferred embodiment of the present invention, the guide groove is provided in four groups evenly distributed in a ring, the second guide block is also provided in four groups corresponding to the guide groove, the fastening plate is provided in eight groups evenly distributed in a ring, and the driving column and the second slot are each provided in eight groups corresponding to the fastening plate.

[0012] In a preferred embodiment of the present invention, the starting unit includes a drive gear that meshes with a ring rack. A rotating shaft is fixedly mounted on the bottom of the drive gear and is rotatably mounted on a bearing. A drive shaft is fixedly mounted on the drive gear, and a second handle is keyed to the drive shaft. The second handle can slide on the drive shaft. A sliding groove is provided on the side cover, and a locking groove is connected to the end of the sliding groove. The second handle can slide in the sliding groove. After multiple fastening plates press the first clamping unit and the second clamping unit together, the second handle slides into the locking groove to achieve locking.

[0013] After adopting the above technical solution, the beneficial effects of the present invention are:

[0014] This invention provides a fixture for airtightness testing, equipped with a clamping assembly. The up-and-down movement of the first housing drives the rotation of the first and second clamping units, enabling rapid opening and closing of the fixture. It can directly reach the maximum engagement depth required for airtightness testing for clamping operations. A fastening assembly is also provided. An actuation unit drives multiple fastening plates to press the clamping assembly, ensuring the fixture has sufficient clamping force on the branch pipe and guaranteeing good sealing performance when clamping the branch pipe. This invention overcomes the shortcomings of existing technologies where each fixture requires tightening all threads, significantly reducing the thread tightening time and improving work efficiency. Because the number of manual thread tightening turns is significantly reduced compared to existing technologies, deviations in rotation angle and torque during manual thread tightening are effectively avoided, ensuring the accuracy of test results. Attached Figure Description

[0015] Figure 1 This is an isometric view of a fixture for airtightness testing according to an embodiment of the present invention;

[0016] Figure 2 This is a cross-sectional view of a clamping component in one embodiment of the present invention;

[0017] Figure 3 This is an exploded view of the clamping component in one embodiment of the present invention;

[0018] Figure 4 This is a schematic diagram of the structure of the first support frame in one embodiment of the present invention;

[0019] Figure 5 This is a schematic diagram of the structure of the first clamping unit and the second clamping unit in one embodiment of the present invention;

[0020] Figure 6 This is a schematic diagram of the clamping component in an unclamped state according to an embodiment of the present invention;

[0021] Figure 7This is a schematic diagram of the clamping component in the clamping state according to an embodiment of the present invention;

[0022] Figure 8 This is a schematic diagram of the fastening assembly in one embodiment of the present invention;

[0023] Figure 9 This is a schematic diagram of the fastening unit and the starting unit in one direction according to an embodiment of the present invention;

[0024] Figure 10 This is a schematic diagram of the fastening unit and the starting unit from another direction in one embodiment of the present invention;

[0025] Figure 11 This is a schematic diagram of the side cover structure in one embodiment of the present invention;

[0026] Figure 12 This is a schematic diagram of the operation of the fastening unit and the starting unit in an unfastened state according to an embodiment of the present invention;

[0027] Figure 13 This is a schematic diagram of the operation of the fastening unit and the starting unit in the fastened state according to one embodiment of the present invention;

[0028] Figure 14 This is a schematic diagram illustrating the operation of airtightness testing of a stainless steel water distributor in one embodiment of the present invention.

[0029] In the figure, 1-clamping assembly; 11-first handle; 12-first housing; 121-cylindrical pin; 13-first support frame; 131-first cylindrical pin; 132-first guide block; 133-support plate; 1331-sliding groove; 134-circular groove; 135-support plate; 136-anti-slip groove; 137-connecting block; 1371-pin hole; 1372-second cylindrical pin; 141-first clamping unit 1411-First connecting plate; 1412-First elongated hole; 1413-First through hole; 1414-First pressure block; 1415-First clamping block; 1416-First clamping groove; 142-Second clamping unit; 1421-Second connecting plate; 1422-Second elongated hole; 1423-Second through hole; 1424-Second pressure block; 1425-Second clamping block; 1426-Second clamping groove; 15-Thrust needle roller; 16-Thrust washer; 17-Rubber seal; 18-Receiving cylinder; 19-Second support frame; 2-Fastening assembly; 21-Top cover; 22-Side cover; 221-Sliding groove; 222-Locking groove; 23-Fastening unit; 231-Turntable; 2311-Guide groove; 2312-Annular rack; 2313-Drive column; 232-Fastening plate; 2321-First slot; 23 22-Slider; 2323-Elastic pad; 233-Chassis; 2331-Second slot; 2332-Second guide block; 2333-Bearing; 234-Starting unit; 2341-Drive gear; 2342-Rotating shaft; 2343-Second handle; 2344-Drive shaft; 3-Stainless steel water distributor; 31-Water distributor body; 32-Branch pipe; 321-External thread; 33-Air inlet; 4-Air source. Detailed Implementation

[0030] The structural and working principles of the present invention will be described in detail below with reference to the accompanying drawings:

[0031] like Figure 1 and Figure 14 As shown, this invention discloses a clamp for airtightness testing, mainly used for testing hollow devices that require airtightness testing, especially for airtightness testing of stainless steel water distributors. The stainless steel water distributor 3 includes a hollow water distributor body 31, and the water distributor body 31 is connected to multiple cylindrical branch pipes 32. The branch pipes 32 connect the water distributor body 31 to the outside. The outer circumferential surface of the branch pipes 32 is provided with external threads 321. The water distributor body 31 is also provided with an air inlet 33 for introducing air. The air inlet 33 can be connected to an air source 4. The air source 4 introduces air into the water distributor body 31 through the air inlet 33. When performing the airtightness test, the clamp disclosed in this invention is used to quickly clamp the branch pipes 32 and keep the open end of the branch pipes 32 sealed.

[0032] The present invention discloses a clamp for airtightness testing, which includes a clamping component 1 and a fastening component 2 fixedly installed on the clamping component 1. The clamping component 1 is used to quickly clamp the branch pipe 32. After the clamping component 1 clamps the branch pipe 32, the fastening component 2 can perform secondary fastening on the clamping component 1 to improve the sealing effect of the clamping component 1 on the opening end of the branch pipe 32.

[0033] like Figures 2 to 4 As shown, the clamping assembly 1 includes a first handle 11, a first housing 12 is fixedly installed at the bottom of the first handle 11, a cylindrical pin 121 is fixedly installed inside the first housing 12, a first support frame 13 is also slidably installed inside the first housing 12, a first clamping unit 141 and a second clamping unit 142 are rotatably installed on the first support frame 13, and a receiving cylinder 18 is fixedly installed at the bottom of the first support frame 13.

[0034] The first support frame 13 includes a first guide block 132, which has the same internal shape as the first housing 12. When the first support frame 13 slides within the first housing 12, the side wall of the first guide block 132 remains in contact with the inner wall of the first housing 12. A support plate 133 is fixedly installed at the bottom of the first guide block 132. A sliding groove 1331 is formed through the support plate 133, and a cylindrical pin 121 passes through the sliding groove 1331. The cylindrical pin 121 can slide within the sliding groove 1331, and the first housing 12 can slide up and down along the sliding groove 1331 via the cylindrical pin 121. A circular groove 134 is also formed on the support plate 133, through which the first cylindrical pin 131 passes. A first clamping unit 141 and a second clamping unit 142 rotate around the first cylindrical pin 131. A support plate 135 is fixedly installed at the bottom of the support plate 133. The support plate 135 has anti-slip grooves 136 on both sides to prevent the first clamping unit 141 and the second clamping unit 142 from shifting in the front-back direction. A connecting block 137 is fixedly installed at the bottom of the support plate 135. The connecting block 137 has pin holes 1371 at both the front and back. A second cylindrical pin 1372 is installed through the pin holes 1371. The receiving cylinder 18 is fixed to the connecting block 137 by the second cylindrical pin 1372. The receiving cylinder 18 is installed from top to bottom with a thrust needle roller 15, a thrust washer 16 and a rubber seal 17. At the same time, the thrust needle roller 15, the thrust washer 16 and the rubber seal 17 are also sleeved on the bottom of the connecting block 137. A second support frame 19 is also fixed to the receiving cylinder 18 by the second cylindrical pin 1372. The second support frame 19 is frame-shaped. The fastening component 2 is fixedly installed on the top of the second support frame 19.

[0035] The rubber seal 17 is used to seal the branch pipe 32. When the operator presses the first handle 11, the lower end face of the rubber seal 17 presses against the end face of the branch pipe 32. The lower end face of the rubber seal 17 undergoes elastic deformation and remains pressed against the end face of the branch pipe 32, thus forming a seal between the lower end face of the rubber seal 17 and the end face of the branch pipe 32, thereby sealing the end face of the branch pipe 32. Under the pressure, the top of the rubber seal 17 can press against the thrust washer 16 and further compress the thrust washer 16. The top of the thrust washer 16 presses against the needle roller at the bottom of the thrust needle roller 15. The bottom of the thrust needle roller 15 has a retainer. The thrust washer 16 is made of rubber and has a large coefficient of friction. When the end face of the branch pipe 32 squeezes the rubber seal 17, the thrust washer 16 can rotate along the thrust needle roller 15 with the rubber seal 17. This allows the thrust needle roller 15 and the thrust washer 16 to form a thrust needle roller bearing together, which can suppress the rubber seal 17 from twisting radially along the branch pipe 32 in the sealed state.

[0036] like Figure 5 As shown, the first clamping unit 141 includes a first connecting plate 1411. The first connecting plate 1411 has a first elongated hole 1412 and a first through hole 1413. The first through hole 1413 is located directly below the first elongated hole 1412. A first clamping block 1415 is fixedly disposed at the bottom of the first connecting plate 1411. A first pressure block 1414 is fixedly installed on the first clamping block 1415. The first elongated hole 1412 is obliquely downward facing inward. An arc-shaped first clamping groove 1416 is provided at the bottom of the first clamping block 1415. An internal thread adapted to the external thread 321 is provided on the surface of the first clamping groove 1416.

[0037] Furthermore, the second clamping unit 142 includes a second connecting plate 1421. The second connecting plate 1421 has a second elongated hole 1422 and a second through hole 1423. The second through hole 1423 is located directly below the second elongated hole 1422. A second clamping block 1425 is fixedly disposed at the bottom of the second connecting plate 1421. A second pressure block 1424 is fixedly installed on the second clamping block 1425. The inner side of the second elongated hole 1422 is obliquely downward. The bottom of the second clamping block 1425 is provided with an arc-shaped second clamping groove 1426. The surface of the second clamping groove 1426 is also provided with an internal thread adapted to the external thread 321. The first cylindrical pin 131 passes through the first through hole 1413 and the second through hole 1423, so that the first connecting plate 1411 and the second connecting plate 1421 rotate around the first cylindrical pin 131 in the anti-slip groove 136.

[0038] like Figure 6As shown, when the first clamping unit 141 and the second clamping unit 142 are in an unclamped state, the top walls of the first elongated hole 1412 and the second elongated hole 1422 abut against the side wall of the cylindrical pin 121. At this time, the cylindrical pin 121 is located at the highest point in the first elongated hole 1412 and the second elongated hole 1422. The first handle 11 and the first housing 12 are both in the highest position. Under the action of the cylindrical pin 121 on the first elongated hole 1412 and the second elongated hole 1422, the included angle between the first clamping block 1415 and the second clamping block 1425 reaches the maximum, which can quickly reach the predetermined engagement depth between the first clamping block 1415 and the second clamping block 1425 and the branch pipe 32.

[0039] like Figure 7 As shown, after the first clamping block 1415 and the second clamping block 1425 reach the predetermined engagement depth, they press down on the first handle 11, causing the first housing 12 to move downwards. This, in turn, causes the cylindrical pin 121 to move downwards within the first elongated hole 1412 and the second elongated hole 1422. The cylindrical pin 121 exerts pressure on the sidewalls of the first elongated hole 1412 and the second elongated hole 1422, and causes the first clamping unit 141 and the second clamping unit to rotate closer to each other around the first cylindrical pin 131, so that the first clamping block 1415 and the second clamping block 1425... 25 gradually clamps the branch pipe 32 until the bottom wall of the first long hole 1412 and the second long hole 1422 abuts against the side wall of the cylindrical pin 121. At this time, the cylindrical pin 121 is located at the lowest point in the first long hole 1412 and the second long hole 1422. The vertical sections of the first clamping block 1415 and the second clamping block 1425 are tightly fitted with the outer wall of the receiving cylinder 18. The internal threads on the surfaces of the first clamping groove 1416 and the second clamping groove 1426 are engaged with the external thread 321. The first clamping unit 141 and the second clamping unit complete the clamping of the branch pipe 32.

[0040] The receiving cylinder 18 can limit the rotation of the first clamping block 1415 and the second clamping block 1425. When the vertical sections of the first clamping block 1415 and the second clamping block 1425 rotate to fit against the outer wall of the receiving cylinder 18, the internal threads and external threads 321 on the surfaces of the first clamping groove 1416 and the second clamping groove 1426 can be properly engaged. This prevents the internal threads and external threads 321 on the surfaces of the first clamping groove 1416 and the second clamping groove 1426 from failing to engage properly due to excessive or insufficient rotation angle of the first clamping block 1415 and the second clamping block 1425, which would cause the branch pipe 32 to jam or fail to seal completely when screwed in.

[0041] like Figures 6 to 11As shown, the fastening assembly 2 includes a top cover 21, a side cover 22 fixedly installed at the bottom of the top cover 21, a fastening unit 23 fixedly installed inside the side cover 22, a base 233 provided on the fastening unit 23, the base 233 fixedly installed on the second support frame 19, a turntable 231 rotatably connected to the base 233, a plurality of fastening plates 232 slidably arranged between the turntable 231 and the base 233, an elastic pad 2323 fixedly arranged on the side wall of the fastening plate 232 near the clamping assembly 1, the elastic pad 2323 can be a rubber pad or a sponge pad, an annular rack 2312 fixedly arranged on the side wall of the turntable 231, the annular rack 2312 meshing with a starting unit 234 capable of driving the turntable 231 to rotate, the turntable 231 can drive the plurality of fastening plates 232 to slide on the base 233 and press the first pressure block 1414 and the second pressure block 1424.

[0042] Furthermore, both the turntable 231 and the chassis 233 are annular. The turntable 231 has a guide groove 2311. A drive column 2313 is fixedly installed at the bottom of the turntable 231. The top of the fastening plate 232 has a first slot 2321 corresponding to the drive column 2313. The drive column 2313 slides in the first slot 2321. A slider 2322 is fixedly installed at the bottom of the fastening plate 232. The top of the chassis 233 has a second slot 2331. The slider 2322 slides in the second slot 2331. A second guide block 2332 and a bearing 2333 are also installed on the top of the chassis 233. The second guide block 2332 passes through the guide groove 2311. The starting unit 234 is rotatably installed on the bearing 2333.

[0043] The starting unit 234 includes a drive gear 2341, which meshes with a ring rack 2312. A rotating shaft 2342 is fixedly installed at the bottom of the drive gear 2341. The rotating shaft 2342 is rotatably mounted on a bearing 2333. A drive shaft 2344 is fixedly installed on the drive gear 2341. A second handle 2343 is keyed to the drive shaft 2344. The second handle 2343 can slide on the drive shaft 2344. A sliding groove 221 is provided on the side cover 22. A locking groove 222 is connected to the end of the sliding groove 221. The second handle 2343 can slide in the sliding groove 221.

[0044] Furthermore, both the first pressure block 1414 and the second pressure block 1424 are arc-shaped plates. When the fastening unit 23 is pressed, the arc-shaped surfaces of the first pressure block 1414 and the second pressure block 1424 abut against the inner surfaces 232 of the multiple fastening plates, and the top surfaces of the first pressure block 1414 and the second pressure block 1424 are flush with the top surfaces of the fastening plates 232.

[0045] like Figure 12As shown, the fastening unit 23 is in an unpressurized state, and the fastening piece 232 is not in contact with the first pressure block 1414 and the second pressure block 1424. At this time, the second handle 2343 is located on the side of the sliding groove 221 away from the locking groove 222.

[0046] like Figure 13 As shown, after the first clamping unit 141 and the second clamping unit complete clamping the branch pipe 32, the second handle 2343 is rotated, which drives the gear 2341 to drive the turntable 231 to rotate. This drives the column 2313 to drive multiple fastening plates 232 to slide within the second slot 2331. The multiple fastening plates 232 gradually approach the first pressure block 1414 and the second pressure block 1424 until the second handle 2343 reaches the end of the second slot 2331 near the locking groove 222. At this time, the elastic pads 2323 on each fastening plate 232 press the first pressure block 1414 and the second pressure block 1424. Furthermore, the elastic pads 2323 on each fastening plate 232 undergo elastic deformation. The rebound force generated by the elastic pads 2323 will sequentially exert a reverse force on the second handle 2343 through the ring rack 2312, the driving gear 2341, and the drive shaft 2344. At this time, the operator manually lifts the second handle 2343 axially along the drive shaft 2344 to the entrance of the locking groove 222. The reaction force generated by the elastic pads 2323 is used to lock the second handle 2343 into the locking groove 222, thereby locking the position of the second handle 2343 and completing the fastening of the fastening component 2 on the clamping component 1.

[0047] In this embodiment, the guide groove 2311 is provided with four sets of uniformly distributed rings, the second guide block 2332 is also provided with four sets of guide grooves 2311, the fastening plate 232 is provided with eight sets of uniformly distributed rings, and the driving column 2313 and the second slot 2331 are both provided with eight sets of fastening plates 232.

[0048] Working principle:

[0049] Before the airtightness test begins, the operator pulls the first handle 11 to the highest position, causing the side wall of the cylindrical pin 121 on the first housing 12 to abut against the top wall of the first elongated hole 1412 and the second elongated hole 1422, and the included angle between the first clamping block 1415 and the second clamping block 1425 reaches its maximum. At the same time, the second handle 2343 is pulled into the sliding groove 221 to the end away from the locking groove 222, and the fastening unit 23 is in an unpressurized state.

[0050] Then, the operator sends the clamp to the deepest engagement depth of the branch pipe 32, presses down the first handle 11, and moves the first housing 12 downward. The cylindrical pin 121 exerts pressure on the side walls of the first elongated hole 1412 and the second elongated hole 1422, and drives the first clamping block 1415 and the second clamping block 1425 to clamp the branch pipe 32. The internal threads on the surfaces of the first clamping groove 1416 and the second clamping groove 1426 are engaged with the external threads 321. At this time, the top surfaces of the first bearing block 1414 and the second bearing block 1424 are flush with the top surface of the fastening plate 232.

[0051] Next, the operator rotates the second handle 2343 to the end of the second slot 2331 near the locking groove 222, causing the elastic pads 2323 on the multiple fastening plates 232 to press the first pressure block 1414 and the second pressure block 1424. Then, the operator manually lifts the second handle 2343 axially along the drive shaft 2344 to the entrance of the locking groove 222, and uses the rebound force generated by the elastic pads 2323 to lock the second handle 2343 into the locking groove 222, thereby locking the position of the second handle 2343 and completing the fastening of the fastening component 2 to the clamping component 1, thus completing the sealing and fastening of the opening end of the branch pipe 32.

[0052] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A fixture for airtightness testing, comprising a clamping assembly (1), wherein a fastening assembly (2) is fixedly mounted on the clamping assembly (1), characterized in that, The clamping assembly (1) includes a first handle (11), a first housing (12) is fixedly mounted on the bottom of the first handle (11), a cylindrical pin (121) is fixedly mounted inside the first housing (12), a first support frame (13) is also slidably mounted inside the first housing (12), a first clamping unit (141) and a second clamping unit (142) are rotatably mounted on the first support frame (13), when the cylindrical pin (121) moves downward, it can drive the first clamping unit (141) and the second clamping unit (142) to move closer to each other, the cylindrical pin (121) When moving upward, it can drive the first clamping unit (141) and the second clamping unit (142) to move away from each other. The bottom of the first support frame (13) is fixedly installed with a receiving cylinder (18). The receiving cylinder (18) is installed with a thrust needle roller (15), a thrust washer (16) and a rubber seal (17) from top to bottom. When the first clamping unit (141) and the second clamping unit (142) clamp, the first clamping unit (141) and the second clamping unit (142) can fit tightly against the outer wall of the receiving cylinder (18). The fastening assembly (2) includes a top cover (21), a side cover (22) fixedly installed at the bottom of the top cover (21), a fastening unit (23) fixedly installed inside the side cover (22), a base (233) provided on the fastening unit (233), the base (233) fixedly installed on the receiving cylinder (18), a turntable (231) rotatably connected to the base (233), a plurality of fastening plates (232) slidably arranged between the turntable (231) and the base (233), and a layer of elastic material fixedly arranged on the side wall of the fastening plate (232) near the clamping assembly (1). The elastic pad (2323) is fixedly provided on the side wall of the turntable (231). The annular rack (2312) is engaged with the starting unit (234) that can drive the turntable (231) to rotate. The turntable (231) can drive multiple fastening plates (232) to slide on the chassis (233) to press the first clamping unit (141) and the second clamping unit (142). When the fastening unit (23) is pressed, the elastic pad (2323) undergoes elastic change, and the starting unit (234) remains locked on the side cover (22).

2. The fixture for leak tightness testing according to claim 1, wherein The first support frame (13) includes a first guide block (132), the side wall of the first guide block (132) is in contact with the inner wall of the first housing (12), a support plate (133) is fixedly installed at the bottom of the first guide block (132), a sliding groove (1331) is provided through the support plate (133), a cylindrical pin (121) is provided through the sliding groove (1331), a circular groove (134) is also provided on the support plate (133), a first cylindrical pin (131) is provided through the circular groove (134), the first clamping unit (141) and the second clamping unit (142) rotate around the first cylindrical pin (131), a support plate (135) is fixedly installed at the bottom of the support plate (133), and anti-slip grooves are provided on both sides of the support plate (135). (136) The first clamping unit (141) and the second clamping unit (142) can rotate in the anti-slip groove (136). A connecting block (137) is fixedly installed at the bottom of the support plate (135). A pin hole (1371) is opened on the connecting block (137). A second cylindrical pin (1372) is installed through the pin hole (1371). The receiving cylinder (18) is fixed on the connecting block (137) by the second cylindrical pin (1372). The thrust needle roller (15), the thrust washer (16) and the rubber seal (17) are sleeved and installed at the bottom of the connecting block (137). A second support frame (19) is also fixed on the receiving cylinder (18) by the second cylindrical pin (1372). The chassis (233) is fixedly installed on the top of the second support frame (19).

3. The fixture for leak tightness testing of claim 2, wherein, The first clamping unit (141) includes a first connecting plate (1411), on which a first elongated hole (1412) and a first through hole (1413) are provided. A first clamping block (1415) is fixedly provided at the bottom of the first connecting plate (1411), and a first pressure block (1414) is fixedly installed on the first clamping block (1415). The first elongated hole (1412) is provided facing inward, and an arc-shaped first clamping groove (1416) is provided at the bottom of the first clamping block (1415). The second clamping unit (142) includes a second connecting plate (1421), on which a second elongated hole (1422) and a second through hole (1423) are provided. A second clamping block (1425) is fixedly provided at the bottom of the second connecting plate (1421), and a second bearing block (1424) is fixedly installed on the second clamping block (1425). The second elongated hole (1422) is obliquely downward facing inward. An arc-shaped second clamping groove (1426) is provided at the bottom of the second clamping block (1425). The first clamping... The surfaces of the groove (1416) and the second clamping groove (1426) are provided with internal threads. The first cylindrical pin (131) passes through the first through hole (1413) and the second through hole (1423). The first connecting plate (1411) and the second connecting plate (1421) rotate around the first cylindrical pin (131) in the anti-slip groove (136). When the bottom walls of the first elongated hole (1412) and the second elongated hole (1422) abut against the cylindrical pin (121), the first clamping block (1415) and the second clamping block (1425) achieve clamping.

4. The fixture for leak tightness testing according to claim 3, wherein The first pressure block (1414) and the second pressure block (1424) are both arc-shaped plates. When the fastening unit (23) is pressed, the arc-shaped surfaces of the first pressure block (1414) and the second pressure block (1424) abut against the inner surfaces of the plurality of fastening plates (232), and the top surfaces of the first pressure block (1414) and the second pressure block (1424) are flush with the top surfaces of the fastening plates (232).

5. The fixture for leak tightness testing of claim 1, wherein, Both the turntable (231) and the chassis (233) are annular. The turntable (231) has a guide groove (2311). A drive column (2313) is fixedly installed at the bottom of the turntable (231). The top of the fastening plate (232) has a first slot (2321) corresponding to the drive column (2313). The drive column (2313) slides in the first slot (2321). A slider (2322) is fixedly installed at the bottom of the fastening plate (232). The top of the chassis (233) has a second slot (2331). The slider (2322) slides in the second slot (2331). The top of the chassis (233) also has a second guide block (2332) and a bearing (2333). The second guide block (2332) passes through the guide groove (2311). The starting unit (234) is rotatably mounted on the bearing (2333).

6. The fixture for leak tightness testing of claim 5, wherein, The guide groove (2311) is provided with four sets of evenly distributed rings, and the second guide block (2332) is also provided with four sets of guide grooves (2311). The fastening plate (232) is provided with eight sets of evenly distributed rings. The driving column (2313) and the second slot (2331) are both provided with eight sets of fastening plates (232).

7. The fixture for leak testing of claim 1, wherein, The starting unit (234) includes a drive gear (2341), which meshes with a ring rack (2312). A rotating shaft (2342) is fixedly mounted on the bottom of the drive gear (2341), and the rotating shaft (2342) is rotatably mounted on a bearing (2333). A drive shaft (2344) is fixedly mounted on the drive gear (2341), and a second handle (2343) is keyed to the drive shaft (2344). The second handle (2343) can slide on the drive shaft (2344). The side cover (22) has a sliding groove (221) and the end of the sliding groove (221) is connected to a locking groove (222). The second handle (2343) can slide in the sliding groove (221). After multiple fastening plates (232) press the first clamping unit (141) and the second clamping unit (142) together, the second handle (2343) slides into the locking groove (222) to achieve locking.

Images