A leak testing and plugging mechanism for a gearbox housing

Abstract

The present invention relates to the technical field of gearbox detection, and particularly relates to a leak detection and plugging mechanism for a gearbox housing, which includes a leak detection and plugging device and a support box. The leak detection and plugging device is located inside the support box. The leak detection and plugging device includes a top cover. It further includes: a support assembly located at the bottom of the top cover. The support assembly includes a substrate. In the present invention, a cylinder is used to apply pressure to the substrate, so that the return spring can apply pressure to the second sleeve, enabling the second sleeve to plug the leak detection hole. At the same time, during the plugging process, the telescopic spring and the return spring can play a buffering role to prevent the gearbox housing from deforming due to excessive force, so as to solve the problems that the existing plugging equipment leaks air under a large impact force, thereby affecting the test results, and the housing will produce obvious deformation under the action of a large plugging force.

Description

Technical Field

[0001] The present invention relates to the technical field of gearbox detection, and particularly relates to a leak testing and plugging mechanism for a gearbox housing. Background Art

[0002] Leak testing of the gearbox housing cavity is a key link in the production quality control of the gearbox. If the leak testing quality is not well controlled, it will cause the gearbox installed in the vehicle to leak oil, affecting the performance of the whole machine. The key to doing a good job in leak testing of the gearbox housing lies in plugging, and the parts that need to be plugged during cavity leak testing are usually large surfaces or relatively large holes, and the reliability of plugging tests is poor.

[0003] When the existing leak testing and plugging of the gearbox housing plugs the leak testing holes on the gearbox, flexible plugging blocks are usually used to plug both sides of the leak testing holes. When the area of leak testing and plugging of the gearbox cavity is relatively large, under the same inflation detection pressure, the contact surface between the flexible plugging block and the gearbox housing is relatively large. When performing inflation detection, the force of the flexible plugging block on the plugging surface of the gearbox housing will be very large. Since the housing is a thin-walled part with an irregular shape, the large force generated by the flexible plugging block during the plugging process will damage the shape of the housing and cause the housing to deform;

[0004] At the same time, when the force applied by the plugging device is relatively large, the plugging force applied by the flexible plugging block around the leak hole is uneven, which easily causes the leak hole on the housing to deform, affecting the matching accuracy between the gearbox housing and the gear shaft;

[0005] When using a small plugging block to plug the leak hole, when the cooperation between the plugging block and the leak hole is uneven, during the cavity leak testing under high pressure conditions, when the pressure generated by the high-pressure gas acts on the plugging block, it may cause the plugging block and the leak hole to be misaligned, so that many qualified parts are judged as leaking parts;

[0006] Therefore, it is very necessary to invent a leak testing and plugging mechanism for a gearbox housing. Summary of the Invention

[0007] For this reason, the present invention provides a leak testing and plugging mechanism for a gearbox housing. By applying pressure to the substrate through a cylinder, the return spring can apply pressure to the second sleeve, so that the second sleeve can plug the leak testing hole. At the same time, during the plugging process, the telescopic spring and the return spring can play a buffering role to prevent the gearbox housing from deforming due to excessive force, so as to solve the problem that the existing plugging device leaks air under a large impact force, thus affecting the test results, and the housing will produce obvious deformation under the action of a large plugging force.

[0008] To achieve the above object, the present invention provides the following technical solution: A leak detection and plugging mechanism for a transmission housing, comprising a leak detection and plugging device and a support box. The leak detection and plugging device is located inside the support box. The leak detection and plugging device includes a top cover. It further includes: a support assembly located at the bottom of the top cover;

[0009] The support assembly includes a substrate. Slide holes are opened at the four corners of the substrate. A fitting groove is opened on the upper surface of the substrate. A sealing strip is attached to the outer side of the fitting groove. Multiple groups of through holes are opened at the bottom of the fitting groove. A transmission seat is provided in the middle of the substrate. The fitting groove is located around the transmission seat. A middle support column is fixedly installed in the middle of the transmission seat. Five leak detection holes are provided outside the transmission seat. The inner diameters of the four outer leak detection holes are the same and surround the middle leak detection hole. The inner diameter of the middle leak detection hole is larger than that of the four outer leak detection holes. Expansion springs are fixedly installed at the tops of the five leak detection holes. Magnetic cores are fixedly installed at the tops of the five expansion springs.

[0010] Preferably, two groups of fitting blocks are fixedly installed on both sides of the top cover. Multiple insertion posts are fixedly installed at the bottom of the top cover. The multiple insertion posts all slide through the substrate and are respectively slidably connected to the multiple through holes. Five first sleeves are fixedly installed at the bottom of the top cover. The four outer first sleeves are of the same size and surround the middle first sleeve. The inner diameter of the middle first sleeve is larger than that of the four outer first sleeves. Metal columns are fixedly installed on the inner side walls of the five first sleeves. The bottoms of the five metal columns are respectively engaged with the tops of the five magnetic cores. Return springs are fixedly installed at the bottoms of the five first sleeves. The five return springs are respectively sleeved on the five metal columns. Second sleeves are slidably connected to the outer side walls of the five metal columns. The second sleeves are located at the bottoms of the return springs. The bottoms of the five return springs are respectively fixedly connected to the tops of the second sleeves on the same metal column.

[0011] Preferably, a cylinder is fixedly installed at the bottom of the support box. The same middle plate is fixedly installed on the inner walls of the two sides in the middle of the support box. The output shaft of the cylinder slides through the middle plate. L-shaped grooves are opened on the inner walls of the two sides of the support box above the middle plate. Limiting support blocks are fixedly installed on both sides of the top of the middle plate. Limiting holes are opened on both sides of the limiting support blocks.

[0012] Preferably, two groups of sliding columns are fixedly installed on both sides of the top of the middle plate. The four sliding columns are respectively fixedly connected to the inner walls of the four limiting holes. The two side walls of the substrate are respectively slidably connected to the inner walls of the two L-shaped grooves. The four sliding columns are respectively slidably connected to the four sliding holes. The top end of the output shaft of the cylinder is fixedly installed with a top plate. The top plate is in movable contact with the bottom of the substrate. Two groups of matching grooves are respectively opened on both sides of the top of the support box. The two matching grooves on the same side are respectively engaged with the two matching blocks on the same side and are fixedly connected by bolts at the top.

[0013] The beneficial effects of the present invention are as follows:

[0014] 1. This device only uses the second sleeve to block the leakage holes on the transmission housing. During the blocking process, the return spring can apply pressure to the second sleeve, so that the second sleeve blocks the leak detection hole, and the pressure applied to the leak detection hole increases slowly. Compared with traditional blocking devices, the applied blocking force can just achieve the blocking effect without damaging the leak detection hole. At the same time, the metal column can cooperate with the magnetic core and play a positioning role during the blocking process, so that the bottom of the second sleeve can just block the leak detection hole, so that the leak detection hole is evenly stressed during the blocking process and prevents it from deforming due to uneven stress.

[0015] 2. Through the cooperation of the magnetic core and the metal column, during the blocking process, the metal column gradually presses the magnetic core, causing the telescopic spring to deform. At the same time, the transmission housing presses the second sleeve. Under the action of the return spring, the sealing ring at the bottom of the second sleeve blocks the transmission housing. When conducting a leak detection test, when the air pressure inside the transmission housing is low, the sealing ring at the bottom of the second sleeve can block the leakage holes on the transmission housing under the elastic force of the return spring. When the air pressure inside the transmission housing is large, under the action of the internal air pressure, the telescopic spring and the return spring are further compressed, effectively relieving the pressure generated by the air pressure on the transmission housing and avoiding deformation due to excessive internal pressure. It can effectively ensure the blocking effect of the transmission housing not only during the leak detection test under low pressure but also during the leak detection block under high-pressure conditions. The structure is simple, the use and operation are convenient and reliable, and the oil leakage risk in the market is greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of the device provided by the present invention;

[0017] Figure 2 is an exploded view of the device provided by the present invention;

[0018] Figure 3 is a schematic structural diagram of the leak detection blocking device provided by the present invention;

[0019] Figure 4Schematic diagram of the structure of the support box provided by the present invention;

[0020] Figure 5 Installation structure diagram of the transmission case seat and the housing provided by the present invention;

[0021] Figure 6 Schematic diagram of the structure of the transmission case seat provided by the present invention;

[0022] Figure 7 Schematic diagram of the structure of the support assembly provided by the present invention;

[0023] Figure 8 Partial installation diagram of the first sleeve at the bottom of the top cover provided by the present invention.

[0024] In the figure: leak detection plugging device 100, support assembly 110, substrate 111, sliding hole 112, mating groove 113, sealing strip 114, through hole 115, transmission case seat 116, middle support column 117, leak detection hole 118, telescopic spring 119, magnetic core 120, top cover 130, mating block 131, plug post 132, first sleeve 133, metal post 134, return spring 135, second sleeve 136, support box 200, cylinder 210, top plate 220, sliding column 230, limit support block 240, limit hole 241, mating groove 250, L-shaped groove 260, middle plate 270. Detailed implementation manners

[0025] The following describes the preferred embodiments of the present invention with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention and are not used to limit the present invention.

[0026] Refer to the attached Figure 1-8 , a leak detection plugging mechanism for a transmission housing provided by the present invention includes a leak detection plugging device 100 and a support box 200. The leak detection plugging device 100 is located inside the support box 200. The leak detection plugging device 100 includes a top cover 130: It further includes: a support assembly 110 located at the bottom of the top cover 130;

[0027] The support component 110 includes a base plate 111. Slide holes 112 are provided at the four corners of the base plate 111. A mating groove 113 is provided on the upper surface of the base plate 111. By mating the gearbox housing with the mating groove 113, the gearbox housing is installed on the leak detection and plugging mechanism. A sealing strip 114 is attached to the outer side of the mating groove 113. After the gearbox housing is mated with the mating groove 113, the sealing strip 114 can prevent the gas inside the gearbox housing from leaking, playing a sealing role. A plurality of groups of through holes 115 are provided at the bottom of the mating groove 113. A gearbox seat 116 is provided in the middle of the base plate 111. The gearbox seat 116 provides an installation position and support for the gearbox housing. A gas detection device (not marked in the figure) is provided at the bottom of the gearbox seat 116. The gearbox housing can be installed on the gearbox seat 116 through the middle support column 117 on the gearbox seat 116. After the plugging is completed, the gas detection device can be started to perform leak detection on the cavity of the gearbox housing. The mating groove 113 is located around the gearbox seat 116. A middle support column 117 is fixedly installed in the middle of the gearbox seat 116. Five leak detection holes 118 are provided outside the gearbox seat 116. The five leak detection holes 118 can be plugged respectively through the second sleeve 136. The five leak detection holes 118 can install the gear shafts of the transmission. The inner diameters of the four outer leak detection holes 118 are the same and surround the middle leak detection hole 118. The inner diameter of the middle leak detection hole 118 is larger than that of the four outer leak detection holes 118. Telescopic springs 119 are fixedly installed at the tops of the five leak detection holes 118. The telescopic springs 119 play a buffering role to prevent the leak detection holes 118 from being damaged due to excessive plugging force. Magnetic cores 120 are fixedly installed at the tops of the five telescopic springs 119. The magnetic cores 120 play a positioning role and can make the metal column 134 just cooperate with them. Two groups of mating blocks 131 are fixedly installed on both sides of the top cover 130. A plurality of plug posts 132 are fixedly installed at the bottom of the top cover 130. The plug posts 132 can install the gearbox housing on the gearbox seat 116, so that it cannot move horizontally during the plugging process. The plurality of plug posts 132 all slide through the base plate 111 and are respectively slidably connected with the plurality of through holes 115. Five first sleeves 133 are fixedly installed at the bottom of the top cover 130. The first sleeves 133 apply pressure to the second sleeve 136 through the return springs 135, so that the bottom of the second sleeve 136 can plug the leak detection holes 118, thus avoiding the damage caused by large-area plugging. The four outer first sleeves 133 are of the same size and surround the middle first sleeve 133. The inner diameter of the middle first sleeve 133 is larger than that of the four outer first sleeves 133. Metal columns 134 are fixedly installed on the inner side walls of the five first sleeves 133. The metal columns 134 can cooperate with the magnetic cores 120 and play a positioning role during the plugging process, so that the bottom of the second sleeve 136 can just plug the leak detection holes 118, so that the leak detection holes 118 are evenly stressed during the plugging process and prevent them from deforming due to uneven stress.The bottoms of the five groups of metal columns 134 are respectively engaged with the tops of the five groups of magnetic cores 120. At the bottoms of the five groups of first sleeves 133, return springs 135 are fixedly installed. The return springs 135 can apply pressure to the second sleeves 136, so that the second sleeves 136 block the leak detection holes 118, and the pressure applied to the leak detection holes 118 increases slowly. Compared with traditional blocking devices, the blocking force applied can just achieve the blocking effect without damaging the leak detection holes 118. The five groups of return springs 135 are respectively sleeved on the five groups of metal columns 134. On the outer side walls of the five groups of metal columns 134, second sleeves 136 are slidably connected. The second sleeves 136 are located at the bottoms of the return springs 135. The bottoms of the five groups of return springs 135 are respectively fixedly connected to the tops of the second sleeves 136 on the same metal column 134. Specifically, through the mating grooves 113 and the middle support columns 117, the transmission housing is installed on the transmission seat 116. At this time, a top cover 130 is installed on the top of the support box 200, so that the multiple plug columns 132 at the bottom of the top cover 130 are matched with the through holes 115 in the mating grooves 113. At this time, the multiple metal columns 134 at the bottom of the top cover 130 pass through the leak detection holes 118 on the transmission housing and are matched with the magnetic cores 120 on the transmission seat 116. The second sleeves 136 on the multiple metal columns 134 are respectively aligned with the centers of the multiple leak detection holes 118 on the transmission housing. By tightening the bolts on the mating blocks 131, the top cover 130 is fixedly connected to the top of the support box 200. At the same time, the air cylinder 210 is started. The output shaft of the air cylinder 210 drives the top plate 220 to push the base plate 111 upward, and the whole support assembly 110 moves upward. The plug columns 132 pass through the through holes 115. At this time, the bottom of the metal column 134 slowly contacts the magnetic core 120 and applies a slowly increasing force to the magnetic core 120, so that the telescopic spring 119 at the bottom of the magnetic core 120 is compressed. At the same time, the whole transmission housing on the transmission seat 116 moves upward, so that the leak detection holes 118 on the transmission housing contact the bottoms of the second sleeves 136. The sealing rings (not marked in the figure) at the bottoms of the second sleeves 136 can block the leak detection holes 118 on the transmission housing. As the air cylinder 210 moves, the blocking force gradually increases. When it increases to a certain threshold value (this threshold value is the displacement of the output shaft of the air cylinder 210 when the second sleeve 136 can just block the leak detection holes 118 on the transmission housing, and this threshold value can be obtained through experiments before the blocking test), the air cylinder 210 stops operating. At this time, the gas detection device at the bottom of the transmission seat 116 is used to inflate the inside of the transmission housing for testing, and it can be detected whether the transmission housing is qualified.,

[0028] Furthermore, a cylinder 210 is fixedly installed at the bottom of the support box 200. A same middle plate 270 is fixedly installed on the inner walls of both sides in the middle of the support box 200. The output shaft of the cylinder 210 slidably penetrates through the middle plate 270. L-shaped grooves 260 are formed on the inner walls of both sides of the support box 200 above the middle plate 270. The two groups of L-shaped grooves 260 provide tracks for the operation of the base plate 111. Limit support blocks 240 are fixedly installed on both sides of the top of the middle plate 270. The limit support blocks 240 provide support for the base plate 111. Limit holes 241 are formed on both sides of the limit support blocks 240. Two groups of sliding columns 230 are fixedly installed on both sides of the top of the middle plate 270. The four groups of sliding columns 230 are fixedly connected to the inner walls of the four groups of limit holes 241 respectively. The two side walls of the base plate 111 are slidably connected to the inner walls of the two groups of L-shaped grooves 260 respectively. The four groups of sliding columns 230 are slidably connected to the four groups of sliding holes 112 respectively. The top end of the output shaft of the cylinder 210 is fixedly installed with a top plate 220. The top plate 220 is in movable contact with the bottom of the base plate 111. Two groups of mating grooves 250 are formed on both sides of the top of the support box 200. The two groups of mating grooves 250 on the same side are respectively engaged with the two groups of mating blocks 131 on the same side and are fixedly connected by bolts at the top. Specifically, by the cooperation of the sliding holes 112 and the sliding columns 230, the base plate 111 can be installed on the two limit support blocks 240. After the installation is completed, the gearbox housing is installed on the gearbox seat 116 through the mating groove 113. At this time, the through holes 115 on the gearbox housing can coincide with the through holes on the gearbox seat 116;

[0029] The use process of the present invention is as follows: Those skilled in the art can install the substrate 111 on the two groups of limit support blocks 240 by matching the sliding holes 112 with the sliding columns 230. After the installation is completed, the gearbox housing is installed on the gearbox seat 116 through the matching groove 113. At this time, the through holes 115 on the gearbox housing can coincide with the through holes on the gearbox seat 116. After the installation is completed, the top cover 130 is installed on the top of the support box 200, so that the multiple groups of insertion columns 132 at the bottom of the top cover 130 are matched with the through holes 115 in the matching groove 113. At this time, the multiple groups of metal columns 134 at the bottom of the top cover 130 pass through the leak detection holes 118 on the gearbox housing and are matched with the magnetic cores 120 on the gearbox seat 116. The second sleeves 136 on the multiple groups of metal columns 134 are respectively centered with the multiple groups of leak detection holes 118 on the gearbox housing. By tightening the bolts on the matching block 131, the top cover 130 is fixedly connected to the top of the support box 200. At the same time, the cylinder 210 is started, and the output shaft of the cylinder 210 drives the top plate 220 to push the substrate 111 upward, and the entire support assembly 110 moves upward. The insertion columns 132 pass through the through holes 115. At this time, the bottom of the metal column 134 slowly contacts the magnetic core 120 and applies a slowly increasing force to the magnetic core 120, so that the telescopic spring 119 at the bottom of the magnetic core 120 is compressed. At the same time, the entire gearbox housing on the gearbox seat 116 moves upward, so that the leak detection holes 118 on the gearbox housing contact the bottom of the second sleeve 136. The sealing ring (not marked in the figure) at the bottom of the second sleeve 136 can block the leak detection holes 118 on the gearbox housing. As the cylinder 210 moves, the return spring 135 can apply pressure to the second sleeve 136, so that the second sleeve 136 blocks the leak detection holes 118, and the pressure applied to the leak detection holes 118 increases slowly. Compared with the traditional blocking device, the blocking force applied can just reach the blocking effect without damaging the leak detection holes 118. When it increases to a certain threshold value (this threshold value is the displacement of the output shaft of the cylinder 210 when the second sleeve 136 can just block the leak detection holes 118 on the gearbox housing, and this threshold value can be obtained through experiments before the blocking test), the cylinder 210 stops running. At this time, the gas detection device at the bottom of the gearbox seat 116 is used to inflate and test the inside of the gearbox housing, and it can be detected whether the gearbox housing is qualified.

[0030] The above are only the preferred embodiments of the present invention. Any person skilled in the art may modify the present invention by using the technical solutions described above or modify it into an equivalent technical solution. Therefore, any simple modification or equivalent replacement made according to the technical solutions of the present invention falls within the scope of protection required by the present invention.

Claims

1. A leak testing and plugging mechanism for a transmission housing, comprising a leak testing and plugging device (100) and a support box (200), wherein the leak testing and plugging device (100) is located inside the support box (200), and is characterized in that: The leak detection and plugging device (100) includes a top cover (130): It further includes: a support assembly (110) located at the bottom of the top cover (130); The support assembly (110) includes a substrate (111). Slide holes (112) are provided at the four corners of the substrate (111). A mating groove (113) is provided on the upper surface of the substrate (111). A sealing strip (114) is attached to the outer side of the mating groove (113). A plurality of through holes (115) are provided at the bottom of the mating groove (113). A transmission seat (116) is provided in the middle of the substrate (111). The mating groove (113) is located around the transmission seat (116). A middle support column (117) is fixedly installed in the middle of the transmission seat (116). Five leak detection holes (118) are provided outside the transmission seat (116). The inner diameters of the four outer leak detection holes (118) are the same and surround the middle leak detection hole (118). The inner diameter of the middle leak detection hole (118) is larger than that of the four outer leak detection holes (118). Expansion springs (119) are fixedly installed at the tops of the five leak detection holes (118). Magnetic cores (120) are fixedly installed at the tops of the five expansion springs (119); Two sets of mating blocks (131) are fixedly installed on both sides of the top cover (130). A plurality of insertion posts (132) are fixedly installed at the bottom of the top cover (130). The plurality of insertion posts (132) all slide through the substrate (111) and are respectively slidably connected to the plurality of through holes (115). Five first sleeves (133) are fixedly installed at the bottom of the top cover (130). The four outer first sleeves (133) are of the same size and surround the middle first sleeve (133). The inner diameter of the middle first sleeve (133) is larger than that of the four outer first sleeves (133). Metal columns (134) are fixedly installed on the inner side walls of the five first sleeves (133). The bottoms of the five metal columns (134) are respectively engaged with the tops of the five magnetic cores (120). Return springs (135) are fixedly installed at the bottoms of the five first sleeves (133). The five return springs (135) are respectively sleeved on the five metal columns (134). Second sleeves (136) are slidably connected to the outer side walls of the five metal columns (134). The second sleeves (136) are located at the bottoms of the return springs (135). The bottoms of the five return springs (135) are respectively fixedly connected to the tops of the second sleeves (136) on the same metal column (134); A cylinder (210) is fixedly installed at the bottom of the support box (200). A same middle plate (270) is fixedly installed on the inner walls of both sides in the middle of the support box (200). The output shaft of the cylinder (210) slidably penetrates through the middle plate (270). L-shaped grooves (260) are formed on the inner walls of both sides of the support box (200) above the middle plate (270). Two limit support blocks (240) are fixedly installed on both sides of the top of the middle plate (270). Limit holes (241) are formed on both sides of the limit support blocks (240).

2. The leak detection and plugging mechanism for a gearbox housing according to claim 1, wherein: Two groups of sliding columns (230) are fixedly installed on both sides of the top of the middle plate (270). The four sliding columns (230) are respectively fixedly connected to the inner side walls of the four limit holes (241). The two side walls of the base plate (111) are respectively slidably connected to the inner side walls of the two L-shaped grooves (260). The four sliding columns (230) are respectively slidably connected to the four sliding holes (112). The top end of the output shaft of the cylinder (210) is fixedly installed with a top plate (220). The top plate (220) is in movable contact with the bottom of the base plate (111). Two groups of mating grooves (250) are formed on both sides of the top of the support box (200). The two mating grooves (250) on the same side are respectively engaged with the two mating blocks (131) on the same side and are fixedly connected by bolts at the top.

Images