Gearbox housing leak detection fixture

Abstract

The utility model relates to a transmission casing shell leakproofness detection clamp belongs to transmission casing shell leakproofness detection technical field, this transmission casing shell leakproofness detection clamp, include: clamp seat, the top fixed connection of clamp seat has a plurality of air cylinders, adjusting mechanism, the adjusting mechanism includes the support disc fixed connection on the surface upper end of air cylinder, through the rotation of iron frame on the surface of air cylinder, the horizontal movement of pin shaft in iron frame, realized the position of pin shaft to carry out self -adaptation adjustment, through the magnetic block improved the resistance of pin shaft in iron frame horizontal movement, through the support disc, tooth block, driven block and spring mutual cooperation, realized the resistance improvement of iron frame on the rotation of air cylinder, further realized the accurate adjustment to the position of pin shaft, compared with the existing difficult to adjust the position of pin shaft, this mode can self -adaptation accurate adjustment pin shaft's position, further accurate clamping transmission casing shell, ensured the accurate transmission casing shell leakproofness detection.

Description

Technical Field

[0001] This utility model relates to the field of gearbox housing sealing test technology, and in particular to a gearbox housing sealing test fixture. Background Technology

[0002] The gearbox housing is an outer shell structure that houses various internal components of the gearbox, such as gears, shafts, and synchronizers. The gearbox housing encapsulates these components together to form a relatively independent working space. After the gearbox housing is manufactured, a sealing test is usually performed to ensure the normal operation of the gearbox. To prevent the gearbox housing from moving or shaking during the sealing test, a special fixture is used to fix the gearbox housing on the sealing test machine.

[0003] When conducting large-scale sealing tests on existing gearbox housings, pneumatic clamps are mostly used. These clamps use pneumatic components such as cylinders to quickly clamp and release the gearbox housings. However, existing pneumatic clamps are usually designed as a single unit. When errors occur between the pneumatic clamp and the pin in clamping the housing, it is difficult to adjust the position of the pin, which makes it difficult to accurately clamp the housing and thus affects the accuracy of the sealing test on the gearbox housing. Utility Model Content

[0004] Therefore, it is necessary to provide a gearbox housing sealing test fixture to address the problem of difficulty in accurately clamping the housing.

[0005] The device includes: a clamp base, on the top of which a plurality of cylinders are fixedly connected; and an adjustment mechanism, which includes a support plate fixedly connected to the upper surface of the cylinders, an iron frame slidably connected to the upper surface of the cylinders, a pin and a driven block slidably connected to the inner wall of the iron frame, magnetic blocks fixedly connected to both sides of the pin, the surface of the magnetic blocks being magnetically attracted to the inner wall of the iron frame, annularly distributed toothed blocks fixedly connected to the surface of the support plate, and a spring fixedly connected to the opposite end of the driven block and the iron frame.

[0006] In one embodiment, a screw is fixedly connected to both the pin and the top of the cylinder, and a nut is threaded onto the surface of the screw.

[0007] In one embodiment, the bottom end of the nut is provided with a washer, and the bottom end of the washer contacts the top of the iron frame. The screw, nut, and washer work together to lock the iron frame and the pin, thereby ensuring the stability of the pin position after adjustment and ensuring precise clamping of the gearbox housing.

[0008] In one embodiment, scale lines are provided on both sides of the iron frame. The scale lines facilitate precise adjustment of the lateral position of the pin within the iron frame.

[0009] In one embodiment, the inner wall of the screw is slidably connected with two pressure blocks, the bottom of which contacts the top of the nut.

[0010] In one embodiment, a friction block is slidably connected to the inner wall of the screw, and the end of the friction block contacts the end of the pressure block.

[0011] In one embodiment, a damping spiral plate is fixedly connected to the end of the friction block, and the top of the damping spiral plate is fixedly connected to the inner top wall of the screw. Through the interaction of the pressure block, friction block, and damping spiral plate, the nut is locked onto the screw, thereby improving the stability after the pin position is adjusted, ensuring precise clamping of the gearbox housing, and ensuring accurate testing of the gearbox housing's sealing performance.

[0012] In one embodiment, the surface of the magnetic block is slidably connected to the inner wall of the iron frame.

[0013] Beneficial effects 1. By rotating the iron frame on the cylinder surface, the pin moves laterally within the iron frame, achieving adaptive adjustment of the pin's position. The magnetic block increases the resistance to the pin's lateral movement within the iron frame. The support plate, toothed block, driven block, and spring work together to increase the resistance to the iron frame's rotation on the cylinder, thereby achieving precise adjustment of the pin's position. Compared to existing methods that make it difficult to adjust the pin's position, this method can adaptively and precisely adjust the pin's position, thereby accurately clamping the gearbox housing and ensuring accurate testing of the gearbox housing's sealing performance. 2. The screw, nut, and washer work together to lock the iron frame and pin, thus ensuring the stability of the pin position after adjustment. The pressure block, friction block, and damping spiral plate work together to lock the nut on the screw, thereby improving the stability of the pin position after adjustment, ensuring precise clamping of the gearbox housing, and ensuring accurate testing of the gearbox housing's sealing performance. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the cylinder and adjusting mechanism of this utility model; Figure 3This is a schematic diagram of the adjustment mechanism structure of this utility model; Figure 4 This utility model Figure 3 Enlarged view of point A in the middle; Figure 5 This utility model Figure 3 Enlarged view of point B in the middle.

[0016] Figure label: 100. Fixture base; 200. Cylinder; 300. Adjustment mechanism; 301. Iron frame; 302. Support plate; 303. Magnetic block; 304. Pin; 305. Screw; 306. Nut; 307. Washer; 308. Pressure block; 309. Friction block; 310. Damping spiral plate; 311. Tooth block; 312. Driven block; 313. Spring. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0018] The following is combined Figures 1-5 This invention describes a gearbox housing sealing performance testing fixture.

[0019] In one embodiment, a gearbox housing sealing test fixture includes: a fixture base 100, with a plurality of cylinders 200 fixedly connected to the top of the fixture base 100; an adjustment mechanism 300, the adjustment mechanism 300 including a support plate 302 fixedly connected to the upper surface of the cylinders 200, an iron frame 301 slidably connected to the upper surface of the cylinders 200, a pin 304 and a driven block 312 slidably connected to the inner wall of the iron frame 301, magnetic blocks 303 fixedly connected to both sides of the pin 304, the surface of the magnetic blocks 303 magnetically attracted to the inner wall of the iron frame 301, annularly distributed toothed blocks 311 fixedly connected to the surface of the support plate 302, a spring 313 fixedly connected to the opposite end of the driven block 312 and the iron frame 301, scale lines provided on both sides of the iron frame 301, and the surface of the magnetic blocks 303 slidably connected to the inner wall of the iron frame 301. The top of the support plate 302 contacts the bottom of the iron frame 301.

[0020] It should be noted that the fixture seat 100 is fixedly installed on the sealing tester, and the sealing tester model can be ATH-3000P.

[0021] In this embodiment, when the gearbox housing needs to be tested for sealing, the gearbox housing is placed centered on the top of the fixture seat 100. When the pin 304 deviates laterally from the reserved hole on the gearbox housing, the pin 304 is pushed to move laterally within the iron frame 301, causing the magnetic block 303 to move laterally within the iron frame 301. This increases the resistance of the pin 304 to move laterally within the iron frame 301, allowing the pin 304 to move slowly within the iron frame 301 and pass through the scale line indicated by the magnetic block 303. This allows the pin 304 to be adjusted to a suitable position so that the surface of the pin 304 can be smoothly inserted into the reserved hole on the housing.

[0022] When the pin 304 deviates angularly from the pre-drilled hole on the gearbox housing, the iron frame 301 is pushed, causing it to rotate on the surface of the cylinder 200 and drive the driven block 312 to move in a ring on the surfaces of two adjacent toothed blocks 311. When the two adjacent toothed blocks 311 contact the driven block 312, they push the driven block 312 and squeeze the spring 313, thereby increasing the resistance to the rotation of the iron frame 301. This allows the iron frame 301 and the pin 304 to rotate slowly at a suitable angle, so that the surface of the pin 304 can be smoothly inserted into the pre-drilled hole on the housing.

[0023] At this time, the control switch of cylinder 200 is operated, causing one end of cylinder 200 to move down, which in turn moves iron frame 301 and pin 304 down, so that pin 304 is accurately inserted into the reserved hole on the housing, and the gearbox housing is fixed on the clamp seat 100.

[0024] The airtightness tester is activated, and gas at a certain pressure is introduced into the gearbox housing. Once the pressure inside the housing reaches the set value, the pressure holding phase begins. The pressure holding time should be adjusted according to the testing requirements, generally ranging from a few seconds to several minutes. During the pressure holding process, the airtightness tester maintains a stable gas pressure and monitors minute pressure changes. If a leak exists in the housing, the pressure will gradually decrease during the pressure holding process.

[0025] After the pressure holding period, the measurement phase begins. The airtightness detector measures the pressure changes inside the housing and calculates the leakage rate based on the pressure changes. After the measurement, the airtightness detector automatically vents the gas from the housing, restoring the pressure to normal. The venting time should be controlled according to the gas discharge volume and rate to ensure a safe and rapid venting process.

[0026] The airtightness tester compares the measured leakage rate with a set leakage standard to determine whether the gearbox housing is qualified. If the leakage rate is less than or equal to the set standard value, the housing is considered to have good sealing performance and the test is qualified; if the leakage rate is greater than the set standard value, the housing is considered to have leakage and the test is unqualified.

[0027] For gearbox housings that fail inspection, further investigation is needed to determine the cause of the leak. This can be done by segmenting the inspection, applying soapy water, or other methods to pinpoint the exact location of the leak. Once the leak is located, the housing should be repaired or the corresponding component replaced, and then the inspection repeated until it passes.

[0028] like Figure 4-5 As shown, a screw 305 is fixedly connected to the top of both the pin 304 and the cylinder 200. A nut 306 is threaded onto the surface of the screw 305. A washer 307 is provided at the bottom of the nut 306. The bottom of the washer 307 contacts the top of the iron frame 301. Two pressure blocks 308 are slidably connected to the inner wall of the screw 305. The bottom of the pressure block 308 contacts the top of the nut 306. A friction block 309 is slidably connected to the inner wall of the screw 305. The end of the friction block 309 contacts the end of the pressure block 308. A damping spiral plate 310 is fixedly connected to the end of the friction block 309. The top of the damping spiral plate 310 is fixedly connected to the inner top wall of the screw 305.

[0029] In this embodiment, after the angle position of the iron frame 301 is adjusted, the shim 307 is placed at a suitable position on the top of the iron frame 301. The nut 306 is threaded onto the surface of the screw 305 on the cylinder 200 using a wrench, so that the bottom end of the nut 306 abuts against the top end of the shim 307. This pushes the two pressure blocks 308 away from each other inside the screw 305, so that the bottom of the pressure block 308 abuts against the top end of the nut 306. This pushes the friction block 309, so that the friction block 309 moves down inside the screw 305, so that the end of the friction block 309 contacts the end of the pressure block 308, thereby locking the pressure block 308 and locking the nut 306 onto the screw 305. This locks the rotation angle range of the iron frame 301. The pin 304 can be locked onto the iron frame 301 in the above manner.

[0030] Working principle: When the pin 304 deviates laterally from the pre-drilled hole on the gearbox housing, it pushes the pin 304 and the magnetic block 303 to move laterally within the iron frame 301. This causes the pin 304 to move slowly within the iron frame 301. By observing the scale line indicated by the magnetic block 303, the pin 304 is adjusted to a suitable position, allowing its surface to smoothly insert into the pre-drilled hole on the housing. The shim 307 is placed at a suitable position on the top of the iron frame 301, and the nut 30 is tightened using a wrench. The screw 305, threaded onto the pin 304, causes the bottom end of the nut 306 to press against the top end of the washer 307, pushing the two pressure blocks 308 away from each other within the screw 305. The bottom of the pressure block 308 then contacts the top end of the nut 306, pushing the friction block 309 downward within the screw 305. The end of the friction block 309 then contacts the end of the pressure block 308, locking the nut 306 onto the screw 305, thereby locking the pin 304 onto the iron frame 301.

[0031] When the pin 304 deviates angularly from the pre-drilled hole on the gearbox housing, the iron frame 301 is pushed, causing it to rotate on the surface of the cylinder 200 and drive the driven block 312 to move in a ring on the surfaces of two adjacent toothed blocks 311. When the two adjacent toothed blocks 311 contact the driven block 312, they push the driven block 312 and compress the spring 313, thereby increasing the resistance to the rotation of the iron frame 301. This allows the iron frame 301 and the pin 304 to rotate slowly at a suitable angle, so that the surface of the pin 304 can be smoothly inserted into the pre-drilled hole on the housing. In this way, the rotation angle range of the iron frame 301 is locked.

[0032] It should be noted that the fixture base 100, cylinder 200, iron frame 301, magnetic block 303, friction block 309, damping spiral plate 310 and spring 313 mentioned above are all devices with relatively mature existing technology. The specific model can be selected according to actual needs. At the same time, the cylinder 200 can be powered by the built-in power supply or by the mains power. The specific power supply method is selected according to the situation and will not be elaborated here.

[0033] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A gearbox housing sealing performance testing fixture, characterized in that, include: A clamp base (100) has several cylinders (200) fixedly connected to its top. Adjustment mechanism (300) includes a support plate (302) fixedly connected to the upper surface of cylinder (200), an iron frame (301) slidably connected to the upper surface of cylinder (200), a pin (304) and a driven block (312) slidably connected to the inner wall of the iron frame (301), a magnetic block (303) fixedly connected to both sides of the pin (304), the surface of the magnetic block (303) magnetically attracted to the inner wall of the iron frame (301), a ring-shaped toothed block (311) fixedly connected to the surface of the support plate (302), and a spring (313) fixedly connected to the opposite end of the driven block (312) and the iron frame (301).

2. The gearbox housing sealing performance testing fixture according to claim 1, characterized in that, The pin (304) and the top of the cylinder (200) are both fixedly connected to a screw (305), and a nut (306) is threaded onto the surface of the screw (305).

3. The gearbox housing sealing performance testing fixture according to claim 2, characterized in that, The bottom end of the nut (306) is provided with a washer (307), and the bottom end of the washer (307) contacts the top of the iron frame (301).

4. The gearbox housing sealing performance testing fixture according to claim 1, characterized in that, The iron frame (301) has scale lines on both sides.

5. The gearbox housing sealing performance testing fixture according to claim 2, characterized in that, The inner wall of the screw (305) is slidably connected with two pressure blocks (308), the bottom of the pressure blocks (308) contacting the top of the nut (306).

6. The gearbox housing sealing performance testing fixture according to claim 5, characterized in that, The inner wall of the screw (305) is slidably connected to a friction block (309), and the end of the friction block (309) contacts the end of the pressure block (308).

7. The gearbox housing sealing performance testing fixture according to claim 6, characterized in that, The friction block (309) is fixedly connected to a damping spiral plate (310) at its end, and the top end of the damping spiral plate (310) is fixedly connected to the inner top wall of the screw (305).

8. The gearbox housing sealing performance testing fixture according to claim 1, characterized in that, The surface of the magnetic block (303) is slidably connected to the inner wall of the iron frame (301).

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