Strain testing device for gearbox assembly shell

Abstract

The invention belongs to the technical field of detection, and particularly relates to a gearbox assembly shell strain testing device which comprises a working plate, and a fastening block and a cushion block are fixed to the upper portion of the working plate through bolts. Metal pipes are connected to the front side and the rear side of the fastening block correspondingly, clamping plates are fixed to the upper ends of the metal pipes correspondingly, sealing rings are embedded into the inner sides of the clamping plates correspondingly, a new material detection assembly is arranged in the fastening block, and the new material detection assembly is used for detecting the sealing performance of the gearbox assembly shell. Wherein one metal pipe pipeline is connected with an air compressor, the other metal pipe pipeline is connected with a new material strain detector, and the new material strain detector is used for detecting the pressure change in the gearbox assembly shell. The device solves the problems that the sealing strength cannot be fully guaranteed, the detection precision cannot be improved, the sealing ring cannot be protected, and the service life of the sealing ring cannot be prolonged when the sealing performance of the current gearbox assembly shell is detected.

Description

Technical Field

[0001] This invention belongs to the field of testing technology, specifically relating to a strain testing device for a gearbox assembly housing. Background Technology

[0002] Strain testing of the transmission assembly housing includes geometric accuracy inspection, material property analysis, and assembly compatibility verification. Material property analysis includes sealing tests. Currently, the mainstream differential pressure airtightness testing method is widely used for transmission assembly housing sealing tests. This method requires strict assurance of the internal sealing strength of the housing during testing; otherwise, it can easily lead to low testing accuracy and inaccurate results. Sealing rings are typically used for this purpose, and their lifespan needs to be guaranteed to reduce replacement frequency and costs. This issue has become a pressing problem for researchers in this field. Summary of the Invention

[0003] The purpose of this invention is to provide a strain testing device for a gearbox assembly housing to solve the problems mentioned in the background art.

[0004] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a strain testing device for a gearbox assembly housing, comprising a working plate, wherein a fastening block and a pad are bolted to the top of the working plate; metal tubes are connected to both the front and rear sides of the fastening block, and clamping plates are fixed to the upper ends of the metal tubes; sealing rings are embedded in the inner sides of the clamping plates; a new material detection component is provided inside the fastening block, which is used to detect the sealing performance of the gearbox assembly housing; one of the metal tubes is connected to an air compressor, and the other metal tube is connected to a new material strain gauge, which is used to detect the pressure change inside the gearbox assembly housing; the strain testing steps are as follows: preliminary preparation, clamping and sealing, inflation stage, pressure stabilization and balancing, and detection and judgment.

[0005] The present invention further describes that the new material detection component includes a turntable and a drive rod. The two metal tubes are slidably connected to the left and right sides of the fastening block, and the inner ends of the tubes are integrally formed with connecting blocks. The inner ends of the connecting blocks are axially connected with cranks. The upper ends of the cranks are sleeved on the upper ends of the drive rods. The turntable is rotatably connected to the inner wall of the fastening block, and one side is integrally formed with a docking shaft. The docking shaft is docked with an output shaft, and the output shaft is connected to the output end of an external drive motor. The inner side of the turntable is integrally formed with an arc block. The surface of the arc block contacts the bottom end of the drive rod, and the bottom end of the drive rod is arc-shaped.

[0006] The present invention further explains that the preliminary preparation includes cleaning the surface of the housing, checking that the housing is free from bumps and that the sealing cover is properly assembled, connecting the connector of the new material strain gauge to one of the metal tubes, and calibrating the new material strain gauge. The clamping and sealing includes placing the housing on the work plate and supporting it with pads. The inflation stage includes filling the housing with compressed gas at a set pressure by injecting gas into the other metal tube using an air compressor. The inflation time is adjusted according to the volume of the housing. The pressure stabilization and balancing stage includes allowing the gas inside the housing to stabilize after inflation for several seconds to eliminate pressure fluctuations caused by gas flow and slight deformation of the housing. The detection and judgment stage includes holding the pressure for several seconds and comparing the pressure difference between the housing and the standard part with the new material strain gauge, or directly detecting the pressure change.

[0007] The present invention further describes that the inner side of the turntable is integrally formed with a second arc block, and the second arc block is arranged opposite to the first arc block. The arc length of the second arc block is less than the arc length of the first arc block. A sliding groove is provided in the middle of the drive rod, and an impact block is slidably connected in the sliding groove. The front and rear sides of the impact block are both spherical and are in contact with the bottom surfaces of the two metal tubes respectively.

[0008] The present invention further illustrates that springs are provided on both the left and right sides of the impact block, and the springs are located in the groove. The two ends of the spring on the left side are fixed to each other with the inner wall of the groove and the impact block. A roller is axially connected to one side of the bottom of the impact block, and the roller is in contact with the arc block.

[0009] The present invention further explains that the turntable is divided into two parts in the middle. One part has a snap-fit ​​block on its inner side, which is magnetic when energized. The other part has a snap-fit ​​groove on its inner side, which is magnetic itself. The turntable controls the magnetic poles by controlling the direction of the current. The snap-fit ​​block and the snap-fit ​​groove snap together.

[0010] The present invention further explains that after the turntable is split in the middle, the docking shaft moves.

[0011] The present invention further illustrates that one end of the arc block is provided with a groove, and the bottom end of the drive rod fits into the groove.

[0012] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: The present invention achieves the sealing of the transmission assembly housing by using a new material detection component, which can improve the sealing strength. At the same time, during the sealing process, the force on the sealing ring gradually increases at a uniform speed, and the force on the sealing ring is precisely controlled. On the one hand, it ensures the sealing performance of the test, and on the other hand, it avoids damage to the sealing ring due to excessive force, which would affect its service life. Moreover, the test process is stable and efficient, which can also greatly improve the efficiency of the test. Simultaneously, simulated operating conditions can be performed to verify sealing stability. Through vibration, the dynamic operating conditions of the gearbox during vehicle operation can be simulated, thereby testing the sealing performance of the housing under long-term vibration environment. For example, it can determine whether the seal will leak due to vibration fatigue, and identify potential sealing failures in actual use in advance, making the test results more valuable. Furthermore, by deforming the two springs, the speed of the impact block during reset is increased, strengthening the impact intensity and thus improving the simulation effect. Attached Figure Description

[0013] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the fastening block of the present invention; Figure 3 This is an exploded view of the novel material detection component of this invention; Figure 4 This is a schematic diagram of the turntable structure of the present invention; Figure 5 This is a plan view of the novel material detection component of the present invention; In the diagram: 1. Working plate; 2. Fastening block; 21. Crank; 22. Drive rod; 221. Impact block; 23. Connecting shaft; 24. Output shaft; 25. Spring; 26. Snap-fit ​​groove; 27. Roller; 28. Turntable; 281. Arc block one; 282. Arc block two; 3. Pad; 4. Metal tube; 41. Connecting block; 5. Clamping plate. Detailed Implementation

[0014] The following detailed, non-limiting description of the technical solution of the present invention, in conjunction with preferred embodiments and accompanying drawings, is provided. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0015] Please see Figures 1-5 The present invention provides a technical solution: a gearbox assembly housing strain testing device, including a working plate 1, and fastening blocks 2 and pad blocks 3 are bolted to the top of the working plate 1 respectively; Metal pipes 4 are connected to both the front and rear sides of the fastening block 2. Clamping plates 5 are fixed to the upper ends of the metal pipes 4. Sealing rings are embedded in the inner side of the clamping plates 5. A new material detection component is installed inside the fastening block 2. The new material detection component is used to detect the sealing performance of the gearbox assembly housing. One of the metal pipes 4 is connected to an air compressor, and the other metal pipe 4 is connected to a new material strain gauge. The new material strain gauge is used to detect the pressure change inside the gearbox assembly housing. The strain test steps are as follows: preliminary preparation, clamping and sealing, inflation stage, pressure stabilization and balancing, and detection and judgment. The gearbox assembly housing is placed on fastening block 2 and pad block 3 for support. Then, the new material detection component is driven, causing the two metal tubes 4 to move closer together, which in turn causes the two clamping plates 5 to move closer together until the sealing ring is tightly fitted to the front and rear sides of the gearbox assembly housing, thus sealing the gearbox assembly housing. This facilitates subsequent sealing performance testing. At the same time, it increases the pressure of the sealing ring on the front and rear sides of the gearbox assembly housing to fully prevent gas leakage during the testing process, which could lead to inaccurate test data.

[0016] The new material testing component includes a turntable 28 and a drive rod 22. Two metal tubes 4 are slidably connected to the left and right sides of the fastening block 2, and the inner ends of both tubes are integrally formed with connecting blocks 41. The inner ends of the connecting blocks 41 are axially connected with cranks 21. The upper ends of the cranks 21 are sleeved on the upper ends of the drive rod 22. The turntable 28 is rotatably connected to the inner wall of the fastening block 2, and one side is integrally formed with a docking shaft 23. The docking shaft 23 docks with an output shaft 24, and the output shaft 24 is connected to the output end of an external drive motor. The inner side of the turntable 28 is integrally formed with an arc block 281. The surface of the arc block 281 contacts the bottom end of the drive rod 22, and the bottom end of the drive rod 22 is arc-shaped. After the air compressor and the new material strain gauge are connected to the two metal pipes 4 respectively, and the gearbox assembly housing is placed, the external drive motor is controlled to run. The output shaft 24 drives the docking shaft 23 to rotate, and the docking shaft 23 drives the turntable 28 to rotate, thereby causing the arc block 281 to rotate around its center. The inner side of the arc block 281 rubs against and squeezes the lower end of the drive rod 22, causing the drive rod 22 to move under force. The crank 21 drives the two metal pipes 4 to move closer to each other, so that the sealing ring is pressed against both sides of the gearbox assembly housing for sealing performance testing. This method of sealing can improve the sealing strength. At the same time, during the sealing process, the force on the sealing ring gradually increases at a uniform speed, and the force on the sealing ring is precisely controlled. On the one hand, it ensures the sealing performance of the test, and on the other hand, it avoids damage to the sealing ring due to excessive force, which would affect its service life. Moreover, the testing process is stable and efficient, and the testing efficiency can be greatly improved.

[0017] Preliminary preparations include cleaning the surface of the housing, checking that the housing is free from bumps and that the sealing cover is properly assembled, connecting the connector of the new material strain gauge to one of the metal tubes 4, calibrating the new material strain gauge, and clamping and sealing, which includes placing the housing on the working plate 1 and supporting it with the pad 3. The inflation stage includes filling the housing with compressed gas at a set pressure by filling the housing with gas into another metal tube 4 through an air compressor. The inflation time is adjusted according to the housing volume. The pressure stabilization and balancing stage includes allowing the gas inside the housing to stabilize after inflation for several seconds, eliminating pressure fluctuations caused by gas flow and slight deformation of the housing. The detection and judgment stage includes holding the pressure for several seconds and comparing the pressure difference between the housing and the standard part with a new material strain gauge, or directly detecting pressure changes. The fully automated system tests the sealing performance of the transmission assembly housing. By testing the sealing performance, it can prevent lubricating oil leakage, avoid damage to core components, and prevent insufficient internal lubrication caused by poor sealing and oil leakage, which can lead to gear wear, bearing seizure, and shifting sticking. In severe cases, it can directly cause the transmission to be scrapped. The testing process is highly accurate, the test data is precise, and the testing efficiency is greatly improved.

[0018] The inner side of the turntable 28 is integrally formed with an arc block 282, which is opposite to the arc block 281. The arc length of the arc block 282 is less than the arc length of the arc block 281. The drive rod 22 is provided with a sliding groove in the middle, and an impact block 221 is slidably connected in the sliding groove. The front and rear sides of the impact block 221 are spherical and contact the bottom surfaces of the two metal tubes 4 respectively.

[0019] Springs 25 are provided on both the left and right sides of the impact block 221, and the springs 25 are located in the groove. The two ends of the left spring 25 are fixed to the inner wall of the groove and the impact block 221. A roller 27 is connected to the bottom side of the impact block 221, and the roller 27 is in contact with the arc block 282. When the first arc block 281 presses against the drive rod 22, the drive rod 22 moves upward, and the sealing ring presses against the gearbox assembly housing. Simultaneously, the second arc block 282 rotates and rubs against the roller 27, causing the roller 27 to rotate. This pulls the impact block 221 downward along the inner wall of the groove, causing the lower spring 25 to deform. Because the arc length of the second arc block 282 is less than that of the first arc block 281, after the first arc block 281 rotates to a certain angle, the roller 27 rolls until it disengages from the second arc block 282. The reaction force generated by the square spring 25 causes the impact block 221 to quickly reset and impact the metal tube 4 through its spherical part. The vibration generated by the impact is transmitted to the gearbox assembly housing, thereby simulating the working conditions to verify the sealing stability. Through vibration, the dynamic working conditions of the gearbox during vehicle operation can be simulated, thereby testing the sealing performance of the housing under long-term vibration environment. For example, it can determine whether the seal will leak due to vibration fatigue, and identify potential sealing failures in actual use in advance, making the test results more valuable. At the same time, when the drive rod 22 moves upward, the impact block 221 is limited by the roller 27, so the upper spring 25 is stretched and deformed. Then the speed of the impact block 221 when it resets is increased, the impact intensity is strengthened, and the working condition simulation effect is improved.

[0020] The turntable 28 is divided into two parts in the middle. One part has a snap-fit ​​block on its inner side, which becomes magnetic when energized. The other part has a snap-fit ​​groove 26 on its inner side, which is also magnetic. The turntable 28 controls the magnetic poles by controlling the direction of the current, and the snap-fit ​​block and the snap-fit ​​groove 26 snap into each other.

[0021] After the turntable 28 splits in the middle, the docking shaft 23 moves; In the simulated working condition to verify the sealing stability, the turntable 28, which is divided into two parts, is energized and generates magnetism, creating a magnetic repulsion between it and the other part, causing the other part to move and disengage from the locking groove 26 through the locking block. The docking shaft 23 slides along the inner wall of the output shaft 24. At this time, the external drive motor can continue to rotate to force the impact block 221 to move back and forth continuously, resulting in frequent impacts, so as to fully simulate the dynamic working condition of the gearbox after it is installed in the vehicle. At the same time, the support of the drive rod 22 by the arc block 281 ensures the sealing performance, which can not only perform accurate sealing performance testing, but also improve the simulation quality. When a reset is required, the current direction of one of the turntables 28 is changed, thereby changing the magnetic force and causing the two turntables 28 to generate magnetic attraction. At the same time, the rotation of the external drive motor causes the snap-fit ​​block to re-embed into the snap-fit ​​groove 26, completing the docking and ensuring continuous and effective sealing testing.

[0022] One end of the arc block 281 is provided with a groove, and the bottom end of the drive rod 22 fits into the groove. Before the two turntables 28 separate, the squeezing force of the sealing ring on the gearbox assembly housing is maximized, and the sealing effect is optimal. At this time, the bottom end of the drive rod 22 is embedded in the groove of the arc block 281 to stabilize the drive rod 22 and the arc block 281 and avoid affecting the sealing test.

[0023] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0024] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention 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, and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A strain testing device for a gearbox assembly housing, comprising a working plate (1), characterized in that: The upper part of the working plate (1) is bolted with a fastening block (2) and a pad block (3); Metal tubes (4) are connected to both the front and rear sides of the fastening block (2). A clamping plate (5) is fixed to the upper end of each metal tube (4). A sealing ring is embedded in the inner side of each clamping plate (5). A new material detection component is provided inside the fastening block (2). The new material detection component is used to detect the sealing performance of the gearbox assembly housing. One of the metal tubes (4) is connected to an air compressor, and the other metal tube (4) is connected to a new material strain gauge. The new material strain gauge is used to detect the pressure change inside the gearbox assembly housing. The strain test steps are as follows: preliminary preparation, clamping and sealing, inflation stage, pressure stabilization and balancing, and detection and judgment.

2. The gearbox assembly housing strain testing device according to claim 1, characterized in that: The new material testing component includes a turntable (28) and a drive rod (22). Two metal tubes (4) are slidably connected to the left and right sides of the fastening block (2), and the inner ends of both tubes are integrally formed with connecting blocks (41). The inner ends of the connecting blocks (41) are axially connected with cranks (21). The upper ends of the cranks (21) are sleeved on the upper ends of the drive rod (22). The turntable (28) is rotatably connected to the inner wall of the fastening block (2), and one side is integrally formed with a docking shaft (23). The docking shaft (23) is docked with an output shaft (24), and the output shaft (24) is connected to the output end of an external drive motor. The inner side of the turntable (28) is integrally formed with an arc block (281). The surface of the arc block (281) contacts the bottom end of the drive rod (22), and the bottom end of the drive rod (22) is arc-shaped.

3. The gearbox assembly housing strain testing device according to claim 2, characterized in that: The preliminary preparation includes cleaning the surface of the shell, checking that the shell is free from bumps and that the sealing cover is properly assembled, connecting the connector of the new material strain gauge to one of the metal tubes (4), and calibrating the new material strain gauge at the same time. The clamping and sealing includes placing the shell on the working plate (1) and supporting it with a pad (3). The inflation stage includes filling the shell with compressed gas at a set pressure by filling the other metal tube (4) with gas through an air compressor. The inflation time is adjusted according to the volume of the shell. The pressure stabilization and balancing includes allowing the gas inside the shell to stabilize after inflation for several seconds, eliminating pressure fluctuations caused by gas flow and slight deformation of the shell. The detection and judgment includes holding the pressure for several seconds, comparing the pressure difference between the shell and the standard part with the new material strain gauge, or directly detecting the pressure change.

4. The gearbox assembly housing strain testing device according to claim 3, characterized in that: The inner side of the turntable (28) is integrally formed with a second arc block (282), and the second arc block (282) is arranged opposite to the first arc block (281). The arc length of the second arc block (282) is smaller than the arc length of the first arc block (281). The drive rod (22) is provided with a sliding groove in the middle, and an impact block (221) is slidably connected in the sliding groove. The front and rear sides of the impact block (221) are spherical and respectively contact the bottom surfaces of the two metal tubes (4).

5. The gearbox assembly housing strain testing device according to claim 4, characterized in that: Springs (25) are provided on both the left and right sides of the impact block (221), and the springs (25) are located in the groove. The two ends of the spring (25) on the left side are fixed to each other with the inner wall of the groove and the impact block (221). A roller (27) is axially connected to the bottom side of the impact block (221), and the roller (27) is in contact with the arc block (282).

6. The gearbox assembly housing strain testing device according to claim 5, characterized in that: The turntable (28) is divided into two parts in the middle. One part has a snap-fit ​​block on its inner side and is magnetic when energized. The other part has a snap-fit ​​groove (26) on its inner side and is magnetic itself. The turntable (28) controls the magnetic poles by controlling the direction of the current. The snap-fit ​​block and the snap-fit ​​groove (26) snap into each other.

7. The gearbox assembly housing strain testing device according to claim 6, characterized in that: After the turntable (28) is separated from the middle, the docking shaft (23) moves.

8. The gearbox assembly housing strain testing device according to claim 7, characterized in that: One end of the arc block (281) is provided with a groove, and the bottom end of the drive rod (22) fits into the groove.

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