Leakage test equipment with internal expansion seal

Abstract

The invention relates to leakage testing equipment with an internal expansion seal. The leakage testing equipment comprises a testing machine; a test platform; a test rack; the supporting jig is used for placing a to-be-tested product; front and rear hole plugging assemblies; an upper plugging assembly; the inflation assembly inflates the interior of the to-be-tested product from a through hole in the side wall of the to-be-tested product; a side plugging assembly; and the front and rear hole plugging assembly, the upper plugging assembly, the inflation assembly, the side surface plugging assembly and the supporting jig are matched to form internal sealing of the to-be-tested product. According to the leakage test equipment with the internal expansion seal, in the leakage test process, end face sealing, inner hole sealing and end face sealing are achieved, a product is sealed, and a workpiece is not crushed. The inner hole sealing tool can accurately enter the inner hole of the product, keeps consistency and stability, does not scratch the workpiece, is suitable for batch automatic production, accurately meets process requirements, and carries out leakage test on the product.

Description

Technical Field

[0001] The invention relates to the technical field of leakage testing, in particular to a leakage testing device with an inner expansion seal. Background Art

[0002] In the machinery manufacturing industry, a considerable number of products need to pass oil, water, and air. For example, when a large truck engine is running, it needs engine oil, so all the channels through which the engine oil passes must be leak-free; to cool the engine, water needs to be added, so all the channels through which the water passes must also be leak-free, and the water and oil channels must not be interoperable. Large trucks use air brakes for braking, so all components from the air tank to the end of the brake must not leak. Therefore, these products require a leak test after casting and processing to detect whether there are defects such as sand holes, looseness, cracks, etc. in the casting blank after processing, which will cause leakage, otherwise it will cause product failure and even cause safety problems.

[0003] Therefore, corresponding leakage test solutions need to be designed for different product requirements. Leakage testing mainly detects whether there are leaks in the oil, water, and gas circuits of the processed products, or whether the leakage rate is within the required range. Usually, there are two leakage test solutions: air detection and water detection. Air detection is detected by instruments through inflation, while water detection is to immerse the product in water and observe whether bubbles are generated by inflation. In most cases, due to the influence of human factors, detection rhythm, etc., most products require air detection to check the leakage rate of the product under a certain pressure, that is, how many milliliters per minute.

[0004] The plugging methods for gas detection in leak testing usually include side plugging, inner hole plugging, or outer diameter plugging. Some products require inner hole plugging according to their functional requirements. In common leak tests, inner hole plugging is done manually. For example, in leak tests of oil pipes, manual plugging makes it impossible to achieve automated production. In addition, for complex parts that need to plug many holes, the cross-use of manual plugging and machine plugging leads to a certain degree of insecurity. Summary of the invention

[0005] To this end, the technical problem to be solved by the present invention is to overcome the problem that in the prior art, leakage testing of products is performed by means of gas detection, and when there are porous positions, the sealing structure design of the sealing holes is unreasonable, resulting in errors in the gas detection.

[0006] In order to solve the above technical problems, the present invention provides a leakage testing device with internal expansion seal, comprising: a test machine; a test platform, which is installed on the test machine; a test frame, which is installed on the test platform; a support fixture, which is arranged on the test platform, and the support fixture is used to place the product to be tested, and the lower end opening of the product to be tested is sealed on the support fixture; a front and rear hole blocking assembly, which is arranged on the test platform, and the front and rear hole blocking assembly is used to block the holes on the side wall of the product to be tested; an upper blocking assembly, which is arranged on the top plate of the test frame, The upper plugging component is used to plug the opening on the upper end of the product to be tested; the inflation component is arranged on the test platform, the inflation component is used to plug a through hole on the side wall of the product to be tested, and the inflation component inflates air into the product to be tested from a through hole on the side wall of the product to be tested; the side plugging component is arranged on the test platform, the side plugging component is used to plug another through hole on the side wall of the product to be tested, and the front and rear hole plugging components, the upper plugging component, the inflation component, the side plugging component and the supporting fixture cooperate to form an internal seal of the product to be tested. The leakage testing equipment with internal expansion seal of the present invention integrates side plugging and inner hole plugging, and perfectly realizes the full automation of the equipment, which not only ensures the safety of the operator, but also reduces the labor intensity of the operator, and can also ensure the consistency of the inner hole seal without damaging the inner hole surface of the product.

[0007] In one embodiment of the present invention, the test platform includes a lower base plate, a support rod, a test flat plate and a plurality of clamping assemblies, the lower base plate is locked on the test machine by fasteners, the test flat plate is connected to the lower base plate by the support rod, the support fixture is fixedly arranged on the test flat plate, the plurality of clamping assemblies are arranged on the lower base plate, and the clamping assemblies are used to clamp the product to be tested on the support fixture.

[0008] In one embodiment of the present invention, a qualified marking component is provided on the test flat plate, and the qualified marking component includes a cylinder mounting plate 1, a marking drive cylinder and a marking head. The cylinder mounting plate 1 is fixedly arranged on the test flat plate, the marking drive cylinder is installed on the cylinder mounting plate 1, and the output end of the marking drive cylinder is connected to the marking head, and the marking drive cylinder drives the marking head to extend for marking on qualified products to be tested.

[0009] In one embodiment of the present invention, the clamping assembly includes a clamping drive cylinder, a clamping flip plate, a clamping head, a rocker arm, a rotating shaft one, a rotating shaft two and a rotating shaft three, the clamping drive cylinder is installed on the lower base plate, one end of the clamping flip plate is connected to the output end of the clamping drive cylinder through the rotating shaft one, the clamping head is arranged on the other end of the clamping flip plate, one end of the rocker arm is connected to the middle position of the clamping flip plate through the rotating shaft two, and the other end of the rocker arm is hinged to the rotating shaft three, and the output end of the clamping drive cylinder extends out to drive the clamping head to clamp onto the step of the outer wall of the product to be tested.

[0010] In one embodiment of the present invention, the supporting fixture includes an internal filling core, a supporting plate and a plurality of positioning blocks, the internal filling core is arranged on the supporting plate, and the internal filling core is filled in the interior of the product to be tested, the supporting plate and the testing plate are fixedly connected, the upper end surface of the supporting plate is a plane for placing the product to be tested, a sealing ring is provided on the upper end surface of the supporting plate, the lower end surface of the product to be tested is attached to the sealing ring, the plurality of positioning blocks are fixedly arranged on the supporting plate, the plurality of positioning blocks are located around the sealing ring, and the plurality of positioning blocks are used to limit the placement interval of the product to be tested.

[0011] In one embodiment of the present invention, the front and rear hole sealing assembly includes a front and rear sealing driving cylinder, a front and rear sealing movable plate, a connecting plate 1 and a front and rear sealing cylinder. The front and rear sealing driving cylinder is arranged on a test flat plate. The connecting plate 1 is connected to the output end of the front and rear sealing driving cylinder, and the connecting plate 1 is fixedly arranged on the front and rear sealing movable plate. One end of the front and rear sealing cylinder is connected to the connecting plate 1. The front and rear sealing cylinder is a cylinder, and sealing rings 2 and 3 are provided on the outer walls of the front and rear sealing cylinders. The front and rear sealing driving cylinders drive the front and rear sealing cylinders to penetrate the product to be tested, and the sealing rings 2 and 3 contact the inner holes on the front and rear walls of the product to be tested to achieve sealing.

[0012] In one embodiment of the present invention, the test plate is provided with a front and rear movable limit block, and the front and rear movable limit block is provided with a limit screw and a locking screw, the limit screw is used to limit the moving position of the front and rear blocking movable plates, and the locking screw is used to lock the front and rear blocking movable plates.

[0013] In one embodiment of the present invention, the upper sealing assembly includes an upper sealing driving cylinder, an upper sealing movable plate, an upper sealing plate, a guide column and a guide sleeve, the upper sealing driving cylinder is fixedly arranged on the test frame, the upper sealing movable plate is connected to the output end of the upper sealing driving cylinder, the upper sealing plate is fixedly arranged on the lower end surface of the upper sealing movable plate, the end surface of the upper sealing plate opposite to the product to be tested is arranged as a plane, and a sealing ring four is arranged on the end surface of the upper sealing plate opposite to the product to be tested, the guide sleeve is arranged on the test frame, the lower end portion of the guide column is fixedly connected to the upper sealing movable plate, and the guide column and the guide sleeve are slidably connected, the upper sealing driving cylinder drives the upper sealing plate to be pressed at the upper end opening position of the product to be tested, and the sealing ring four contacts with the upper end surface of the product to be tested to achieve sealing.

[0014] In one embodiment of the present invention, the inflation assembly includes a support seat 1, an inflation drive cylinder, an adapter block 1 and an inner diameter quick connector. The inflation drive cylinder is fixedly arranged on the support seat 1, and the output end of the inflation drive cylinder is connected with the inner diameter quick connector through the adapter block 1. The inflation drive cylinder drives the inner diameter quick connector to seal at the inner hole position of the side wall of the product to be tested, and the inner diameter quick connector is used to inflate the interior of the product to be tested.

[0015] In one embodiment of the present invention, the side sealing assembly includes a support seat 2, a side sealing cylinder, an adapter block 2 and a side sealing head. The side sealing cylinder is fixedly arranged on the support seat 2, and the output end of the side sealing cylinder is connected with the side sealing head through the adapter block 2. The side sealing cylinder drives the side sealing head to seal at the inner hole position of the side wall of the product to be tested.

[0016] The above technical solution of the present invention has the following beneficial effects compared with the prior art: The leakage test equipment with internal expansion seal of the present invention has both end face seal and inner hole seal during the leakage test process. The end face seal not only seals the product but also does not crush the workpiece. The inner hole seal, the inner hole seal tooling not only accurately enters the inner hole of the product, and maintains consistency and stability, but also does not scratch the workpiece. It is suitable for batch automated production, accurately meets the process requirements, and performs leakage tests on the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below according to specific embodiments of the present invention in conjunction with the accompanying drawings, wherein Figure 1 It is a schematic diagram of the overall structure of a leakage testing device with an internal expansion seal in a preferred embodiment of the present invention; Figure 2The structure of the leakage test device with internal expansion seal in the preferred embodiment of the present invention is shown in FIG. Figure 1 ; Figure 3 The structure of the leakage test device with internal expansion seal in the preferred embodiment of the present invention is shown in FIG. Figure 2 ; Figure 4 The structure of the leakage test device with internal expansion seal in the preferred embodiment of the present invention is shown in FIG. Figure 3 ; Figure 5 The structure of the front and rear hole plugging assembly in the preferred embodiment of the present invention is shown in FIG. Figure 1 ; Figure 6 The structure of the front and rear hole plugging assembly in the preferred embodiment of the present invention is shown in FIG. Figure 2 ; Figure 7 It is a structural schematic diagram of a pressing assembly in a preferred embodiment of the present invention; Figure 8 It is a schematic diagram of the structure of a qualified marking component in a preferred embodiment of the present invention; Fig. 9 It is a structural schematic diagram of an upper plugging assembly in a preferred embodiment of the present invention; Fig.10 It is a structural schematic diagram of an inflatable component in a preferred embodiment of the present invention; Fig.11 It is a structural schematic diagram of a side blocking assembly in a preferred embodiment of the present invention; Fig.12 The structure of the product to be tested in the preferred embodiment of the present invention is schematically shown in FIG. Figure 1 ; Fig.13 The structure of the product to be tested in the preferred embodiment of the present invention is schematically shown in FIG. Figure 2 .

[0018] Description of the accompanying drawings in the specification: test machine 1, test platform 2, lower base plate 21, support rod 22, test plate 23, through hole 1 231, positioning sleeve 232, clamping assembly 24, clamping drive cylinder 241, clamping flip plate 242, clamping head 243, swing rod 244, rotating shaft 1 245, rotating shaft 246, rotating shaft 3 247, qualified marking assembly 25, cylinder mounting plate 1 251, marking drive cylinder 252, marking head 253, test frame 3, support fixture 4, internal filling core 40, support plate 41, guide block 1 411, guide hole 1 412, positioning block 42, inclined surface 1 421, front and rear hole blocking assembly 5, front and rear blocking drive cylinder 51, front and rear blocking movable plate 52, slider 1 521, connecting plate 1, 53, front and rear blocking cylinders 54, sealing ring 2, 541, sealing ring 3, 542, front and rear moving limit blocks 55, limit screws 551, locking screws 552, linear guide rail 1, 56, upper blocking assembly 6, upper blocking drive cylinder 61, upper blocking moving plate 62, positioning column 621, upper blocking plate 63, sealing ring 4, 631, guide column 64, guide sleeve 65, inflation assembly 7, support seat 1, 71, mounting plate 1, 711, limit block 2, 712, inflation drive cylinder 72, adapter block 1, 73, inner diameter quick connector 74, side blocking assembly 8, support seat 2, 81, mounting plate 2, 811, limit block 3, 812, side blocking cylinder 82, adapter block 2, 83, side blocking head 84. DETAILED DESCRIPTION

[0019] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0020] In such Fig.12 , 13 In the product to be tested, the inner walls of the opening and the hole (i.e. the red part) are both sealing surfaces, of which the upper and lower seals are required to be on the end faces, while the front, back, left and right seals are on the inner surfaces of the holes. The internal space is the sealed cavity that needs to be tested, that is, to check whether the aluminum alloy die-casting covered by the internal cavity has penetrating sand holes, looseness, etc. on the surface after processing. The leakage test standard is required to be 1.5Bar, and the leakage rate shall not be greater than 2.1cc / min.

[0021] For the above-mentioned products to be tested, which have both end face seals and inner hole seals, it is necessary to realize automated mass production without damaging the surface of the inner hole, and to ensure the safety of the operator, while preventing possible unsafe situations caused by the intersection of manual and automatic seals. To achieve the above requirements, the inner hole sealing tooling needs to be accurately positioned, and the inner hole sealing tooling needs to maintain a certain concentricity with the inner hole, and realize automatic expansion sealing, so as to extend the service life of the expansion tooling seal ring, without damaging the end face and inner hole of the product, and the consistency of the compression and sealing position needs to be maintained, so that the test of batch products is stable and reliable.

[0022] Reference Figure 1-4 As shown, the leakage test equipment with internal expansion seal of the present invention comprises: a test machine 1, a test platform 2, a test frame 3, a support fixture 4, a front and rear hole plugging assembly 5, an upper plugging assembly 6, an inflation assembly 7 and a side plugging assembly 8; the test platform 2 is installed on the test machine 1; the test frame 3 is installed on the test platform 2; the support fixture 4 is arranged on the test platform 2, and the support fixture 4 is used to place the product to be tested, and the lower end opening of the product to be tested is sealed on the support fixture 4; the front and rear hole plugging assembly 5 is arranged on the test platform 2, and the front and rear hole plugging assembly 5 is used to plug the holes on the side wall of the product to be tested; the upper A sealing component 6 is arranged on the top plate of the test frame 3, and the upper sealing component 6 is used to seal the opening on the upper end of the product to be tested; an inflation component 7 is arranged on the test platform 2, and the inflation component 7 is used to seal a through hole on the side wall of the product to be tested, and the inflation component 7 inflates air into the interior of the product to be tested from a through hole on the side wall of the product to be tested; a side sealing component 8 is arranged on the test platform 2, and the side sealing component 8 is used to seal another through hole on the side wall of the product to be tested. The front and rear hole sealing components 5, the upper sealing component 6, the inflation component 7, the side sealing component 8 and the supporting fixture 4 are used to form an internal seal of the product to be tested.

[0023] Reference Figure 3 , 4As shown, the test platform 2 includes a lower bottom plate 21, a support rod 22, a test flat plate 23 and a plurality of clamping assemblies 24. The lower bottom plate 21 is locked on the test machine 1 by fasteners. The test flat plate 23 is connected to the lower bottom plate 21 by the support rod 22. The support fixture 4 is fixedly arranged on the test flat plate 23. The plurality of clamping assemblies 24 are arranged on the lower bottom plate 21, and the clamping assemblies 24 are used to clamp the product to be tested on the support fixture 4. The lower bottom plate 21 and the test flat plate 23 are both rectangular flat plates, and the lower bottom plate 21 and the test flat plate 23 are arranged vertically opposite and parallel to each other. The support rod 22 is a cylindrical rod. The test flat plate 23 is provided with a plurality of through holes 231. The output end of the clamping assembly 24 passes through the through hole 231 and is clamped on the product to be tested.

[0024] Reference Figure 2 , 8 As shown, the test flat plate 23 is provided with a qualified marking assembly 25, and the qualified marking assembly 25 includes a cylinder mounting plate 1 251, a marking drive cylinder 252 and a marking head 253. The cylinder mounting plate 1 251 is fixedly arranged on the test flat plate 23, the marking drive cylinder 252 is mounted on the cylinder mounting plate 1 251, and the output end of the marking drive cylinder 252 is connected to the marking head 253, and the marking drive cylinder 252 drives the marking head 253 to extend for marking on the qualified product to be tested. For qualified products, the marking drive cylinder 252 drives the marking head 253 to move toward the tested product, and the product is marked by marking the surface of the product by the marking head 253.

[0025] Reference Figure 7 As shown, the clamping assembly 24 includes a clamping drive cylinder 241, a clamping flip plate 242, a clamping head 243, a swing rod 244, a rotation shaft 1 245, a rotation shaft 246 and a rotation shaft 3 247. The clamping drive cylinder 241 is installed on the lower base plate 21. One end of the clamping flip plate 242 is connected to the output end of the clamping drive cylinder 241 through the rotation shaft 1 245. The clamping head 243 is arranged on the other end of the clamping flip plate 242. One end of the swing rod 244 is connected to the middle position of the clamping flip plate 242 through the rotation shaft 246, and the other end of the swing rod 244 is hinged to the rotation shaft 3 247. The output end of the clamping drive cylinder 241 extends out to drive the clamping head 243 to be clamped to the step of the outer wall of the product to be tested. The rotation shaft 3 247 can be hinged to a support block arranged on the test plate 23 or the clamping drive cylinder 241. The telescopic rod of the pressing driving cylinder 241 passes through the first through hole 231 .

[0026] Reference Figure 5 , 6As shown, the support fixture 4 includes an internal filling core 40, a support plate 41 and a plurality of positioning blocks 42. The internal filling core 40 is arranged on the support plate 41, and the internal filling core 40 is filled inside the product to be tested. The support plate 41 and the test plate 23 are fixedly connected. The upper end surface of the support plate 41 is a plane for placing the product to be tested. A sealing ring 43 is arranged on the upper end surface of the support plate 41. The lower end surface of the product to be tested is attached to the sealing ring 43. The plurality of positioning blocks 42 are fixedly arranged on the support plate 41. The plurality of positioning blocks 42 are located around the sealing ring 43, and the plurality of positioning blocks 42 are used to limit the placement interval of the product to be tested. The upper end of the positioning block 42 is provided with an inclined surface 421 on one side of the sealing ring 43. The inclined surface 421 is used to expand the interval surrounded by the plurality of positioning blocks 42, so as to facilitate the product to be tested to be placed between the plurality of positioning blocks 42. The support plate 41 is provided with a guide block 411, and the guide block 411 is provided with a guide hole 412. The marking head 253 is arranged in the guide hole 412, and the guide hole 412 is used to guide the marking head 253 to approach or move away from the product to be tested.

[0027] Reference Figure 5 , 6 As shown, the front and rear hole plugging assembly 5 includes a front and rear plugging drive cylinder 51, a front and rear plugging movable plate 52, a connecting plate 1 53 and a front and rear plugging cylinder 54. The front and rear plugging drive cylinder 51 is arranged on the test plate 23. The connecting plate 1 53 is connected to the output end of the front and rear plugging drive cylinder 51, and the connecting plate 1 53 is fixedly arranged on the front and rear plugging movable plate 52. One end of the front and rear plugging cylinder 54 is connected to the connecting plate 1 53. The front and rear plugging cylinder 54 is a cylinder, and a sealing ring 2 541 and a sealing ring 3 542 are arranged on the outer wall of the front and rear plugging cylinder 54. The front and rear plugging drive cylinder 51 drives the front and rear plugging cylinder 54 to penetrate the product to be tested, and the sealing ring 2 541 and the sealing ring 3 542 contact the inner holes on the front and rear walls of the product to be tested to achieve sealing. The axial direction of the front and rear plugging cylinder 54 is arranged along the moving direction of the telescopic rod of the front and rear plugging drive cylinder 51. The test plate 23 is provided with two parallel linear guide rails 56, and the front and rear blocking movable plates 52 are provided with a slider 521, which is arranged on the linear guide rail 56 and can slide along the linear guide rail 56. The internal filling core 40 is provided with a through hole 401 penetrating along the moving direction of the front and rear blocking movable plates 52, and the front and rear blocking cylinders 54 simultaneously pass through the through hole 401 when penetrating the product to be tested.

[0028] In the above structure, the test plate 23 is provided with a front and rear movable limit block 55, and the front and rear movable limit block 55 is provided with a limit screw 551 and a locking screw 552. The limit screw 551 is used to limit the moving position of the front and rear blocking movable plate 52, and the locking screw 552 is used to lock the front and rear blocking movable plate 52.

[0029] Reference Figure 3 , 9 As shown, the upper sealing assembly 6 includes an upper sealing driving cylinder 61, an upper sealing movable plate 62, an upper sealing plate 63, a guide column 64 and a guide sleeve 65. The upper sealing driving cylinder 61 is fixedly arranged on the test frame 3, the upper sealing movable plate 62 is connected to the output end of the upper sealing driving cylinder 61, the upper sealing plate 63 is fixedly arranged on the lower end surface of the upper sealing movable plate 62, the end surface of the upper sealing plate 63 opposite to the product to be tested is set as a plane, and a sealing ring 631 is provided on the end surface of the upper sealing plate 63 opposite to the product to be tested, the guide sleeve 65 is arranged on the test frame 3, the lower end of the guide column 64 is fixedly connected to the upper sealing movable plate 62, and the guide column 64 is slidably connected to the guide sleeve 65, the upper sealing driving cylinder 61 drives the upper sealing plate 63 to be pressed at the upper end opening position of the product to be tested, and the sealing ring 631 contacts the upper end surface of the product to be tested to achieve sealing. The upper blocking movable plate 62 is a rectangular flat plate, and positioning columns 621 are provided at the four corners of the lower end surface of the upper blocking movable plate 62. A positioning sleeve 232 is provided on the test plate 23, and a positioning hole 233 is provided at the center of the positioning sleeve 232. After the upper blocking driving cylinder 61 drives the upper blocking movable plate 62 to descend into place, the positioning column 621 is inserted into the positioning hole 233 to realize the positioning of the upper blocking plate 63 and the product to be tested.

[0030] Reference Fig.10 As shown, the inflatable assembly 7 includes a support seat 71, an inflatable drive cylinder 72, an adapter block 73 and an inner diameter quick connector 74, the inflatable drive cylinder 72 is fixedly arranged on the support seat 71, the output end of the inflatable drive cylinder 72 is connected to the inner diameter quick connector 74 through the adapter block 73, the inflatable drive cylinder 72 drives the inner diameter quick connector 74 to block at the inner hole position of the side wall of the product to be tested, and the inner diameter quick connector 74 is used to inflate the inside of the product to be tested. The telescopic rod of the inflatable drive cylinder 72 can be set to an inclined structure matching the inner hole on the side wall of the product to be tested, and the moving direction of the inner diameter quick connector 74 is also along the oblique direction. The support seat 71 is provided with a mounting plate 711, and a limit block 2 712 is provided at one end of the mounting plate 711 close to the product, and the adapter block 1 73 can contact the limit block 2 712 to realize the limit of the movement of the inner diameter quick connector 74.

[0031] Reference Fig.11 As shown, the side plugging assembly 8 includes a support seat 2 81, a side plugging cylinder 82, a transfer block 2 83 and a side plugging head 84, wherein the side plugging cylinder 82 is fixedly arranged on the support seat 2 81, and the output end of the side plugging cylinder 82 is connected to the side plugging head 84 through the transfer block 2 83, and the side plugging cylinder 82 drives the side plugging head 84 to plug at the inner hole position of the side wall of the product to be tested. The support seat 1 71 and the support seat 2 81 are respectively located on both sides of the product to be tested, and the support seat 1 71 and the support seat 2 81 are both fixedly arranged on the test plate 23. Preferably, the side plugging head 84 is set to a cylindrical shape, which can match the circular hole on the side wall of the product to be tested. The support seat 2 81 is provided with a mounting plate 2 811, and the mounting plate 2 811 is provided with a limit block 3 812 at one end close to the product, and the transfer block 2 83 can contact the limit block 3 812 to realize the limit of the movement of the side plugging head 84.

[0032] The working principle of the leakage test device with internal expansion seal of the present invention is: First, adjust the position of the inflation component 7 and the side sealing component 8: install the inner diameter quick connector 74 and the side sealing head 84 on the connecting plates of the left and right inflation drive cylinders 72 and the side sealing cylinders 82 respectively, remove the air pipes on the inflation drive cylinders 72 and the side sealing cylinders 82, and allow the inner diameter quick connector 74 and the side sealing head 84 to slide down freely, observe the coaxiality of the inner diameter quick connector 74 and the side sealing head 84 with the inner holes on both sides of the product to be tested, and then adjust the side adjustment screws to adjust the front, back, left and right of the inner diameter quick connector 74 and the side sealing head 84 so that the inner diameter quick connector 74 and the side sealing head 84 can just enter the inner hole of the product to be tested without obvious jamming.

[0033] Position debugging of the front and rear hole plugging components 5: unplug the air pipe on the front and rear plugging driving cylinder 51, manually push the front and rear plugging cylinders 54, move forward along the linear track, observe the concentric relationship of the front and rear plugging cylinders 54 in the hole and whether there is any jamming, then adjust the rear adjustment screws, adjust the front and rear plugging cylinders 54 up and down and left and right, so that the front and rear plugging cylinders 54 can enter the inner hole of the product to be tested without obvious jamming.

[0034] Test process: The product is roughly positioned by several positioning blocks 42 around it, and placed on the support fixture 4 with positioning pins. The sealing ring 43 seals the lower end face of the product to be tested. The start button, the clamping drive cylinder 241 under the support fixture 4 drives the clamping head 243 to press the step of the outer wall of the workpiece to be tested, and the upper plugging drive cylinder 61 drives the upper plugging movable plate 62 to move downward, so that the upper plugging plate 63 fits on the upper end face of the product to be tested, and the sealing ring 4 631 seals the upper end face of the product. The piston rod of the side plugging cylinder 82 drives the side plugging head 84 downward to block the side inner hole of the product to be tested, and the piston rod of the inflation drive cylinder 72 drives the inner diameter quick connector 74 downward to the stop block position. After the system receives the position signal, the inner diameter quick connector 74 begins to expand and seal. The piston rod of the front and rear sealing drive cylinder 51 on the rear side drives the front and rear sealing cylinders 54 on the slider to move forward along the linear track and stop after reaching the stop screw position. After receiving the position information, the system starts to expand and seal, and then inflate the product. According to the required process parameters, a leak test is performed to check whether the required leakage rate requirements are met. The left front cylinder is marked for OK parts, and an alarm is issued for NG parts. After the inspection is completed, in the reverse order, the front and rear sealing cylinders 54 are first cut off and retracted, and then the rear cylinder is withdrawn, and then the inflation drive cylinder 72 and the side sealing cylinder 82 are cut off and retracted, and then the side cylinder is withdrawn, and then the upper sealing drive cylinder 6 drives the upper sealing plate 63 to withdraw, and finally the pressing drive cylinder 241 is released to remove the workpiece.

[0035] Obviously, the above embodiments are merely examples for clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the protection scope of the invention.

Claims

1. A leak testing device with an internal expansion seal, characterized in that: include: Testing machine; A test platform, which is installed on a test machine; A test rack mounted on the test platform; A support fixture is arranged on the test platform and is used to place the product to be tested, and the lower end opening of the product to be tested is sealed on the support fixture; Front and rear hole plugging components, which are arranged on the test platform, and are used to plug the holes on the side walls of the product to be tested; An upper plugging assembly, which is arranged on the top plate of the test frame, and is used to plug the opening on the upper end of the product to be tested; An inflatable component is arranged on the test platform, the inflatable component is used to block a through hole on the side wall of the product to be tested, and the inflatable component inflates air into the product to be tested from the through hole on the side wall of the product to be tested; A side sealing assembly is arranged on the test platform, and is used to seal another through hole on the side wall of the product to be tested. The front and rear hole sealing assemblies, the upper sealing assembly, the inflation assembly, the side sealing assembly and the supporting fixture are used to form an internal seal of the product to be tested.

2. The leak test device with internal expansion seal according to claim 1, characterized in that: The test platform includes a lower base plate, a support rod, a test flat plate and a plurality of clamping assemblies. The lower base plate is locked on the test machine by fasteners, the test flat plate is connected to the lower base plate by the support rod, the support fixture is fixedly arranged on the test flat plate, the plurality of clamping assemblies are arranged on the lower base plate, and the clamping assemblies are used to clamp the product to be tested on the support fixture.

3. The leak test device with internal expansion seal according to claim 2, characterized in that: A qualified marking component is provided on the test flat plate, and the qualified marking component includes a cylinder mounting plate 1, a marking drive cylinder and a marking head. The cylinder mounting plate 1 is fixedly arranged on the test flat plate, the marking drive cylinder is installed on the cylinder mounting plate 1, and the output end of the marking drive cylinder is connected to the marking head, and the marking drive cylinder drives the marking head to extend for marking on qualified products to be tested.

4. The leak test device with internal expansion seal according to claim 2, characterized in that: The clamping assembly includes a clamping drive cylinder, a clamping flip plate, a clamping head, a rocker arm, a rotating shaft one, a rotating shaft two and a rotating shaft three. The clamping drive cylinder is installed on the lower base plate. One end of the clamping flip plate is connected to the output end of the clamping drive cylinder through the rotating shaft one. The clamping head is arranged on the other end of the clamping flip plate. One end of the rocker arm is connected to the middle position of the clamping flip plate through the rotating shaft two, and the other end of the rocker arm is hinged to the rotating shaft three. The output end of the clamping drive cylinder extends out to drive the clamping head to clamp onto the step of the outer wall of the product to be tested.

5. The leak test device with internal expansion seal according to claim 2, characterized in that: The supporting fixture comprises an internal filling core, a supporting plate and a plurality of positioning blocks, wherein the internal filling core is arranged on the supporting plate and is filled in the interior of the product to be tested, the supporting plate and the testing plate are fixedly connected, the upper end surface of the supporting plate is a plane for placing the product to be tested, a sealing ring is arranged on the upper end surface of the supporting plate, the lower end surface of the product to be tested is attached to the sealing ring, the plurality of positioning blocks are fixedly arranged on the supporting plate, the plurality of positioning blocks are located around the sealing ring, and the plurality of positioning blocks are used to limit the placement interval of the product to be tested.

6. The leak test device with internal expansion seal according to claim 2, characterized in that: The front and rear hole plugging components include front and rear plugging drive cylinders, front and rear plugging movable plates, connecting plate 1 and front and rear plugging cylinders. The front and rear plugging drive cylinders are arranged on the test flat plate. The connecting plate 1 is connected to the output end of the front and rear plugging drive cylinders, and the connecting plate 1 is fixedly arranged on the front and rear plugging movable plate. One end of the front and rear plugging cylinders is connected to the connecting plate 1. The front and rear plugging cylinders are cylinders, and sealing rings 2 and 3 are arranged on the outer walls of the front and rear plugging cylinders. The front and rear plugging drive cylinders drive the front and rear plugging cylinders to penetrate the product to be tested. The sealing rings 2 and 3 are in contact with the inner holes on the front and rear walls of the product to be tested to achieve sealing.

7. The leak test device with internal expansion seal according to claim 6, characterized in that: The test plate is provided with a front and rear moving limit block, and the front and rear moving limit block is provided with a limit screw and a locking screw. The limit screw is used to limit the moving position of the front and rear blocking moving plates, and the locking screw is used to lock the front and rear blocking moving plates.

8. The leak test device with internal expansion seal according to claim 1, characterized in that: The upper sealing assembly includes an upper sealing drive cylinder, an upper sealing movable plate, an upper sealing plate, a guide column and a guide sleeve. The upper sealing drive cylinder is fixedly arranged on the test frame, and the upper sealing movable plate is connected to the output end of the upper sealing drive cylinder. The upper sealing plate is fixedly arranged on the lower end surface of the upper sealing movable plate. The end surface of the upper sealing plate opposite to the product to be tested is arranged to be a plane, and a sealing ring four is arranged on the end surface of the upper sealing plate opposite to the product to be tested. The guide sleeve is arranged on the test frame, the lower end portion of the guide column is fixedly connected to the upper sealing movable plate, and the guide column is slidably connected to the guide sleeve. The upper sealing drive cylinder drives the upper sealing plate to be pressed at the upper end opening position of the product to be tested, and the sealing ring four contacts with the upper end surface of the product to be tested to achieve sealing.

9. The leak test device with internal expansion seal according to claim 1, characterized in that: The inflation assembly includes a support seat 1, an inflation drive cylinder, an adapter block 1 and an inner diameter quick connector. The inflation drive cylinder is fixedly arranged on the support seat 1, and the output end of the inflation drive cylinder is connected with the inner diameter quick connector through the adapter block 1. The inflation drive cylinder drives the inner diameter quick connector to seal the inner hole position of the side wall of the product to be tested, and the inner diameter quick connector is used to inflate the interior of the product to be tested.

10. The leak test device with internal expansion seal according to claim 1, characterized in that: The side sealing assembly includes a second support seat, a side sealing cylinder, a second adapter block and a side sealing head. The side sealing cylinder is fixedly arranged on the second support seat. The output end of the side sealing cylinder is connected with the side sealing head through the second adapter block. The side sealing cylinder drives the side sealing head to seal at the inner hole position of the side wall of the product to be tested.

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