Speed reducer shell strength detection device

Abstract

The invention discloses a speed reducer shell strength detection device, and relates to the technical field of speed reducer shell detection, the speed reducer shell strength detection device comprises a storage table and a shell body placed on the upper surface of the storage table, two sides of the shell body are provided with two symmetrically distributed hard frames, and the two hard frames are filled with a plurality of steel balls. The steel balls can be attached to the concave-convex surface of the outer wall of the outer shell to move in a self-adaptive manner, so that the outer shell is comprehensively and uniformly extruded; a movable plate and a positioning plate are sequentially stacked on the outer side of the hard frame, a plurality of connecting mechanisms used for connecting the hard frame are arranged on the two sides of the back face of the movable plate, the movable plate can apply disturbance to the steel balls, the steel balls are attached to the concave-convex face of the outer shell in a self-adaptive mode for displacement, and comprehensive and accurate positioning of the outer shell is achieved. An irregular arc-shaped sliding groove is matched to drive the rotating disc to rotate randomly, distribution of steel balls is disturbed, local random pressurization is started while pressure is evenly distributed, complex working conditions are accurately simulated, and test comprehensiveness and authenticity are improved.

Description

Technical Field

[0001] This invention relates to the field of speed reducer housing testing technology, specifically a speed reducer housing strength testing device. Background Technology

[0002] The gearbox housing is an important component of the gearbox, mainly serving to protect the internal gears, bearings, and other core components. It effectively isolates external dust, impurities, and moisture, preventing these contaminants from causing wear or corrosion to the internal components, thereby ensuring the normal operation of the gearbox. Meanwhile, the reducer housing also serves to support and fix the internal structure, ensuring that each component maintains a stable relative position during operation and reducing displacement and damage caused by factors such as vibration. In addition, it can also reduce the noise generated by the reducer during operation to a certain extent, thus achieving a sound insulation effect. Therefore, after the gearbox housing is produced, its strength needs to be tested. If the housing is not strong enough, it may be fatigued and damaged due to repeated stress during long-term use, which will lead to a decrease in the structural stability of the housing and make it unable to effectively protect the internal parts. The strength test mainly tests the sample's ability to stretch, compress, bend, shear and other aspects. Currently, compression testing is mainly used to apply axial or radial compressive loads to the shell to simulate the extrusion stress the shell is subjected to during operation, detect its resistance to compressive deformation, and test whether it has the risk of cracking or leakage under high pressure. However, in actual operation, it was found that the surface of the reducer housing after processing has many uneven surfaces, such as heat dissipation fins and wiring ports (used to embed cable connectors, temperature sensors and other components). Traditional pressure heads are mostly flat or regular curved surfaces, which are difficult to effectively fit with the surface of the housing, resulting in uneven pressure distribution. The stress is mainly concentrated in the raised areas, while the recessed areas fail to bear the force fully, which cannot truly reflect the overall mechanical performance of the structure. In addition, speed reducers often face complex and variable external loads in actual operating environments. The location and direction of the force are highly random and uncertain. Existing testing equipment is mostly based on preset fixed force points, and the test mode is simple. It is difficult to simulate the multi-directional and random compression state under real working conditions, and the test results have great limitations.

[0003] To address the aforementioned issues, there is an urgent need for innovative designs based on existing testing devices. Summary of the Invention

[0004] The present invention addresses the problem that existing technical solutions are too simplistic and provides a solution that is significantly different from existing technologies. Specifically, the purpose of the present invention is to provide a speed reducer housing strength testing device to solve the problems mentioned in the background technology, such as the indenter's inability to fully fit the concave and convex surfaces of the housing for comprehensive testing, the relatively singular stress point, and the limited test results.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a speed reducer housing strength testing device, including a platform and an outer housing placed on the upper surface of the platform, and two symmetrically distributed rigid frames are provided on both sides of the housing. Each of the two rigid frames is filled with a number of steel balls, and the steel balls can adaptively move in accordance with the concave and convex surfaces of the outer wall of the housing to achieve comprehensive and uniform compression of the outer housing. The rigid frame is stacked with movable plates and positioning plates on its outer side. The movable plates have several connecting mechanisms on both sides of their back sides to connect with the rigid frame. The movable plates can agitate the steel balls so that the steel balls can be randomly displaced inside the rigid frame, thereby increasing the compressive force on the outer shell in a local area.

[0006] Preferably, the connecting mechanism includes a slide rail fixedly connected to the back of the movable plate, and a pulley that slides along the slide rail. A support rod is rotatably connected to one side of the pulley, a rotating rod is slidably connected to one end of the support rod, and a connecting rod is slidably connected to the end of the rotating rod away from the support rod.

[0007] Preferably, one end of the connecting rod is fixedly connected to the rigid frame. By squeezing the rigid frame, the connecting rod is driven to move synchronously, which further drives the rotating rod to rotate, so that the rigid frame and the movable plate can move relative to each other. A wire mesh is installed on the inner side of the rigid frame, and rubber baffles are fixedly connected to both sides and the top of the rigid frame.

[0008] Preferably, a limiting frame is fixedly connected to the top of the positioning plate, and a turntable is rotatably connected to one side of the limiting frame via a bearing. The surface of the turntable is provided with a plurality of equally distributed arc-shaped sliding grooves, and the plurality of arc-shaped sliding grooves are interconnected. A slider that slides along the arc-shaped sliding grooves is fixedly connected to the top of the rigid frame.

[0009] Preferably, a limiting track is fixedly connected to the top of the limiting frame, a rack is slidably connected inside the limiting track, and a toothed ring is engaged on one side of the rack.

[0010] Preferably, the top of the turntable is fixedly connected to the gear ring, one end of the rack is slidably connected to a limit rod, and the limit rod is fixedly connected to the top of the movable plate.

[0011] Preferably, the back of the movable plate is a flat structure, and the front of the movable plate is a wavy curved surface structure. Spring telescopic rods for connecting the positioning plate are installed at the top and bottom of the positioning plate.

[0012] Preferably, the interior of the shelf is rotatably connected to a bidirectional lead screw, and two connecting blocks are slidably connected to the surface of the bidirectional lead screw, and a soft pad is fixedly connected to the top of each connecting block, the soft pad being tightly fitted to both sides of the inner wall of the outer shell.

[0013] Preferably, the outer wall of the shelf is rotatably connected to a mounting plate, the bottom of the shelf is equipped with the output shaft of a servo motor, and the upper surface of the mounting plate is provided with a hydraulic cylinder corresponding to the position of the positioning plate.

[0014] Compared with the prior art, the beneficial effects of the present invention are: By filling a rigid frame with several freely movable steel balls and installing a wire mesh on the inner side of the rigid frame, the steel balls are constrained to prevent them from detaching from the frame due to violent disturbances. In conjunction with the connecting mechanism, the movable plate moves towards the rigid frame, further compressing the steel balls inside. The steel balls dynamically roll and fill the uneven surfaces of the outer shell, closely fitting the complex curved surfaces of the outer shell such as the heat dissipation fins and wiring ports together with the wire mesh. This avoids the problem of concentrated force on convex surfaces and no force on concave surfaces, eliminates the stress concentration problem caused by traditional flat pressure heads, and ensures that the pressure is evenly transmitted to all functional areas. In addition, several arc-shaped grooves with equal angles are opened on the surface of the turntable. When the slider enters any arc-shaped groove, it can trigger the turntable to rotate. The rotation of the turntable triggers the rack to move, which in turn drives the movable plate to slide back and forth. The front of the movable plate is set as a wave-shaped curved surface. When the movable plate slides back and forth, it generates differentiated thrust through the undulation of the curved surface, which enhances the complexity of the disturbance to the steel balls and causes the steel balls to accumulate locally. During the continuous pressurization process, the force at this position is greater than that in other areas, so as to achieve localized key extrusion. Furthermore, each arc-shaped groove has an irregular shape and is different overall. The radius of curvature, tilt angle, and turning point of each groove are different. The differentiated design of the arc-shaped grooves causes the turntable to rotate at different amplitudes after each cycle of sliding back and forth of the slider. This further causes the movable plate to perform random reciprocating motion. The result of the steel ball disturbance is unpredictable. The steel ball accumulation point is not limited by the preset trajectory and is completely determined by the randomness of the motion. This accurately reproduces the scenario in real working conditions where the location and force of the outer shell being squeezed are unpredictable. This makes the test results closer to the stress risks in actual use. Compared with the mode of fixed stress points in traditional devices, the test results can better restore the stress performance of the outer shell in complex environments, reduce the limitations of the results, and improve the flexibility and comprehensiveness of the test. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0016] Figure 2 This is a schematic diagram of the rigid frame structure of the present invention.

[0017] Figure 3 This is a cross-sectional view of the rigid frame structure of the present invention.

[0018] Figure 4 This is a schematic diagram of the structure after the rigid frame and movable plate of the present invention are separated.

[0019] Figure 5 For the present invention Figure 3 Enlarged structural diagram at point A in the middle.

[0020] Figure 6 For the present invention Figure 3 Enlarged structural diagram at point B in the middle.

[0021] Figure 7 This is a schematic diagram of the structure of the turntable and gear ring after disassembly according to the present invention.

[0022] Figure 8 This is a schematic diagram of the connection structure between the slider and the arc-shaped groove after cross-section of the turntable of the present invention.

[0023] Figure 9 This is a schematic diagram of the sliding stroke of the slider in this invention.

[0024] Figure 10 This is a cross-sectional view of the shelf structure of the present invention.

[0025] In the diagram: 1. Display platform; 101. Two-way lead screw; 102. Connecting block; 103. Soft pad; 104. Mounting plate; 105. Servo motor; 106. Hydraulic cylinder; 2. Outer shell; 3. Rigid frame; 4. Steel ball; 5. Movable plate; 6. Connecting mechanism; 601. Slide rail; 602. Pulley; 603. Support rod; 604. Rotating rod; 605. Connecting rod; 7. Wire mesh; 8. Rubber baffle; 9. Positioning plate; 901. Limiting frame; 902. Turntable; 903. Arc-shaped slide groove; 904. Slider; 905. Limiting track; 906. Rack; 907. Gear ring; 908. Limiting rod; 10. Spring telescopic rod. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Please see Figures 1 to 10 The present invention provides a technical solution: a speed reducer housing strength testing device, including a platform 1 and an outer housing 2 placed on the upper surface of the platform 1, and two symmetrically distributed rigid frames 3 are provided on both sides of the outer housing 2. The two rigid frames 3 are filled with a number of steel balls 4, and the steel balls 4 can adaptively move in accordance with the concave and convex surfaces of the outer wall of the outer housing 2 to achieve comprehensive and uniform compression of the outer housing 2. A movable plate 5 and a positioning plate 9 are stacked on the outer side of the rigid frame 3. Several connecting mechanisms 6 are provided on both sides of the back of the movable plate 5 to connect the rigid frame 3. The movable plate 5 can agitate the steel ball 4 so that the steel ball 4 will randomly displace inside the rigid frame 3, thereby increasing the local extrusion pressure on the outer shell 2. By filling the rigid frame 3 with several freely movable steel balls 4, the steel balls 4 dynamically roll to fill the uneven surface of the outer shell 2, which can closely fit the complex curved surfaces such as the heat dissipation fins and wiring ports of the outer shell 2, avoiding the problem of concentrated force on the convex surface and no force on the concave surface, eliminating the stress concentration problem caused by the traditional flat pressure head, and ensuring that the pressure is evenly transmitted to all functional areas. By agitating the steel ball 4 with the movable plate 5, causing it to move randomly, the compressive force dynamically changes on the surface of the outer shell 2. This can simulate unpredictable random compression scenarios in actual work. Compared with the fixed force point mode of traditional devices, the test results can better reflect the stress performance of the outer shell in complex environments, reduce the limitations of the results, and improve the flexibility and comprehensiveness of the test.

[0028] In this embodiment, if Figure 3 and Figure 5 As shown, the connecting mechanism 6 includes a slide rail 601 fixedly connected to the back of the movable plate 5, and a pulley 602 that slides along the slide rail 601. A support rod 603 is rotatably connected to one side of the pulley 602, a rotating rod 604 is slidably connected to one end of the support rod 603, and a connecting rod 605 is slidably connected to the end of the rotating rod 604 away from the support rod 603. One end of the connecting rod 605 is fixedly connected to the rigid frame 3. By squeezing the rigid frame 3, the connecting rod 605 is moved synchronously, which further drives the rotating rod 604 to rotate, so that the rigid frame 3 and the movable plate 5 can move relative to each other. A wire mesh 7 is installed on the inner side of the rigid frame 3, and rubber baffles 8 are fixedly connected to both sides and the top of the rigid frame 3. It should be noted that the support rod 603 and the connecting rod 605 are distributed at both ends of the rotating rod 604. Slide grooves are provided at both ends of the rotating rod 604. When the rotating rod 604 rotates, it causes the support rod 603 and the connecting rod 605 to move relative to each other, which in turn causes the rigid frame 3 and the movable plate 5 to move relative to each other, moving closer or further apart. The slide rail 601 is fixedly connected to the back of the movable plate 5, and the connecting rod 605 is fixedly connected to the rigid frame 3. The pulley 602 can slide along the slide rail 601, which means that the support rod 603 can vertically compress the movable plate 5, and at the same time ensure that the resistance is small when the movable plate 5 slides back and forth. Through the connection between the pulley 602 and the slide rail 601, the movable plate 5 moves more smoothly in the whole free process and avoids jamming. In addition, such as Figure 2 As shown, a wire mesh 7 is installed on the inner side of the rigid frame 3. The wire mesh 7 has the function of free deformation. The wire mesh 7 can constrain the displacement range of the steel ball 4 and prevent the steel ball 4 from detaching from the rigid frame 3 due to violent disturbance. Rubber baffles 8 are installed on both sides and the top. The bottom is supported by a rigid base plate. The rubber baffles 8 are also fixedly connected to the top layer of the movable plate 5. The rigid frame 3 and the movable plate 5 are connected by the rubber baffles 8, which can prevent the steel ball 4 from falling and ensure that the movement of the movable plate 5 is not restricted. In addition, the rubber baffles 8 have a certain tensile deformation function. When the movable plate 5 squeezes the steel ball 4, if the outer shell 2 has many convex and concave surfaces, the space can be expanded by the rubber baffles 8 to absorb some of the squeezed steel ball 4. Additionally, it should be noted that the wire mesh 7 of the rigid frame 3 is on a different plane from the entire outer frame of the rigid frame 3. Steel balls 4 are also embedded in the inner edge of the rigid frame 3. The edges of the steel balls 4 are relatively smooth, so they will not cause wear to the outer shell 2 when the rigid frame 3 comes into contact with the outer shell 2. The wire mesh 7 is embedded in the inner wall of the rigid frame 3, and there is a certain gap between the two. When force is applied for the first time, the steel balls 4 on the inner edge of the rigid frame 3 come into contact with the outer shell 2, while the wire mesh 7 and the steel balls 4 inside the rigid frame 3 do not come into contact with the outer shell 2. When force is applied for the second time, the rigid frame 3 is blocked at the front end and moves backward in the opposite direction, while pushing the movable plate 5 forward. The two move relative to each other and begin to gradually approach each other until the movable plate 5 squeezes all the steel balls 4 inside the rigid frame 3 forward, adhering to the inner wall of the wire mesh 7, and embedding them together with the wire mesh 7 into the groove of the outer shell 2.

[0029] In this embodiment, if Figure 3 , Figure 4 and Figure 6As shown, a limiting frame 901 is fixedly connected to the top of the positioning plate 9, and a turntable 902 is rotatably connected to one side of the limiting frame 901 via a bearing. Several arc-shaped sliding grooves 903 are evenly distributed on the surface of the turntable 902, and the several arc-shaped sliding grooves 903 are interconnected. A slider 904 that slides along the arc-shaped sliding grooves 903 is fixedly connected to the top of the rigid frame 3. It should be noted that the top of the positioning plate 9 is fixedly connected to the limiting frame 901. The limiting frame 901 is rotatably connected to the turntable 902 through the bearing. The turntable 902 is connected through the bearing, so that the turntable 902 can rotate freely. Several arc-shaped slide grooves 903 are opened on the surface of the turntable 902 at equal angles. The arc-shaped slide grooves 903 are interconnected, allowing the slider 904 to slide freely in all the arc-shaped slide grooves 903. Furthermore, it should be noted that the shape of each arc-shaped slide 903 is irregular and varies overall. The radius of curvature, inclination angle, and turning point of each slide are different. When the slider 904 enters any arc-shaped slide 903, it can trigger the rotation of the turntable 902, causing the movable plate 5 to undergo unpredictable displacement. In addition, auxiliary balls are installed at the junction of each arc-shaped slide 903, which helps the slider 904 to smoothly enter the second arc-shaped slide 903 from the first arc-shaped slide 903, making the sliding process of the slider 904 smoother.

[0030] In this embodiment, if Figure 3 and Figure 6 As shown, a limiting track 905 is fixedly connected to the top of the limiting frame 901, and a rack 906 is slidably connected inside the limiting track 905. A toothed ring 907 is engaged on one side of the rack 906.

[0031] For example Figure 7 and Figure 8 As shown, the top of the turntable 902 is fixedly connected to the gear ring 907, and one end of the rack 906 is slidably connected to the limit rod 908, which is fixedly connected to the top of the movable plate 5. It should be noted that the limiting frame 901, the limiting track 905, and the bearing are all fixedly connected to the positioning plate 9, the turntable 902 is fixedly connected to the gear ring 907, and the rack 906 is slidably connected inside the limiting track 905. The rotation of the turntable 902 drives the gear ring 907 to rotate synchronously. Guided by the irregular arc-shaped slide groove 903, the turntable 902 rotates at different amplitudes, which further drives the rack 906 to slide irregularly back and forth. Furthermore, the rack 906 is slidably connected to the limiting rod 908, allowing it to slide along the axial direction of the limiting rod 908. When the rack 906 moves, it also drives the limiting rod 908 and the movable plate 5 to slide irregularly back and forth, further randomly disturbing the steel balls 4 within the rigid frame 3. The movable plate 5 creates multi-dimensional random disturbances to the steel balls 4, causing localized accumulation of the steel balls 4. The accumulation point is unpredictable. When a large amount of steel balls 4 accumulates in a certain area, the force at that location is greater than in other areas during continuous pressurization, achieving focused localized compression testing. Due to the differentiated design of the arc-shaped groove 903, the accumulation point of the steel balls 4 changes dynamically each time. The accumulation point is not limited by a preset trajectory but is entirely determined by the randomness of the movement, accurately replicating the scenario where the location and force of the outer shell 2 under compression are unpredictable in real-world working conditions, making the test results closer to the stress risks in actual use.

[0032] In this embodiment, if Figure 1 As shown, the back of the movable plate 5 is a flat structure, and the front of the movable plate 5 is a wavy curved surface structure. The top and bottom of the positioning plate 9 are equipped with spring telescopic rods 10 for connecting the positioning plate 9. It should be noted that the back flat design of the movable plate 5 ensures a stable connection with the rigid frame 3, while the front is designed as a wavy curved surface. When the movable plate 5 slides irregularly back and forth, it generates differentiated thrust through the undulation of the curved surface, which enhances the complexity of the disturbance to the steel ball 4 and improves the simulation accuracy of local extrusion. The positioning plate 9 and the rigid frame 3 are connected by the spring telescopic rod 10, which can transmit pressure and make the rigid frame 3 automatically reset through the elastic rebound force.

[0033] In this embodiment, if Figure 10 As shown, a bidirectional lead screw 101 is rotatably connected inside the shelf 1. Two connecting blocks 102 are slidably connected to the surface of the bidirectional lead screw 101, and a soft pad 103 is fixedly connected to the top of each connecting block 102. The soft pad 103 is tightly attached to both sides of the inner wall of the outer shell 2. The outer wall of the shelf 1 is rotatably connected to the mounting plate 104, the bottom of the shelf 1 is equipped with the output shaft of the servo motor 105, and the upper surface of the mounting plate 104 is provided with a hydraulic cylinder 106 corresponding to the position of the positioning plate 9. It should be noted that the bidirectional lead screw 101 is embedded inside the platform 1, and its surface is provided with forward and reverse spiral threads, which are threaded to two connecting blocks 102 respectively. When the bidirectional lead screw 101 rotates, the two connecting blocks 102 slide in opposite directions, and the soft pad 103 on its top can fit tightly against the inner wall of the outer shell 2 to achieve clamping and fixing of the outer shell 2. The soft pad 103 is made of highly elastic material, which can better fit the shape of the inner wall of the outer shell 2. The clamping point is set on the inner wall of the outer shell 2, which will not interfere with the external test. In addition, the mounting plate 104 serves as a basic support frame, supporting the platform 1 and the hydraulic cylinder 106. A servo motor 105 is installed at the bottom of the platform 1. The servo motor 105 drives the platform 1 to rotate. After the test of one side of the outer shell 2 is completed, the servo motor 105 can be started to rotate it 90° to test the other side. The hydraulic cylinder 106 presses the two positioning plates 9 at a constant speed, which further drives the entire rigid frame 3 and the movable plate 5 to move synchronously and make close contact with the outer wall of the outer shell 2, simulating continuous external pressure and verifying the impact resistance of the outer shell 2.

[0034] Working principle: When using this testing device, first fix the outer shell 2, place the outer shell 2 to be tested on the surface of the stage 1, rotate the bidirectional lead screw 101 inside the stage 1, the positive and negative spiral threads on the surface of the bidirectional lead screw 101 drive the two connecting blocks 102 to slide in opposite directions, the high elastic soft pad 103 on the top of the connecting block 102 moves with the connecting block 102, tightly fits the two sides of the inner wall of the outer shell 2, and clamps and fixes the outer shell 2 from the inside; Next, the pressure will be applied in stages: In the first stage, the hydraulic cylinder 106 is activated. The hydraulic cylinder 106 pushes the two side positioning plates 9 toward the outer shell 2 at a constant speed. The positioning plates 9 drive the rigid frame 3 to move synchronously, so that the rigid frame 3 initially contacts the outer shell 2, and the steel balls 4 embedded in its inner side edge first contact the outer wall of the outer shell 2. In the second stage, the hydraulic cylinder 106 continues to push the positioning plate 9, the movable plate 5, and the rigid frame 3. At this time, the rigid frame 3 has already come into contact with the outer shell 2. The front end is blocked and begins to move backward in the opposite direction, driving the connecting rod 605 to move backward in sync, pushing the rotating rod 604 to rotate. The rotating rod 604 drives the support rod 603 at the other end to swing in the opposite direction, driving the pulley 602 to abut against the slide rail 601, applying reverse forward pressure to the slide rail 601, further driving the movable plate 5 to move closer to the rigid frame 3. During the approach process, the movable plate 5 squeezes the steel balls 4 inside the rigid frame 3. The steel balls 4 exert force on the mesh surface of the wire mesh 7 through dynamic rolling, so that the mesh surface of the wire mesh 7 and the steel balls 4 together fill the uneven area on the surface of the outer shell 2. In the third stage, continuous pressure testing is conducted. After the steel balls 4 and wire mesh 7 on both sides are fully and tightly attached to the outer shell 2, continuous pressure is applied. At this time, the pressure is transmitted forward layer by layer through the positioning plate 9, the movable plate 5, the steel balls 4 and the wire mesh 7, gradually increasing the pressure. Then, the pressure is stopped for a period of time to observe the pressure resistance of the outer shell. Then, it is released. This process of pressing and observing is repeated multiple times. When the test on both sides of the outer shell 2 is completed, the servo motor 105 at the bottom of the platform 1 is started to drive the platform 1 to rotate the outer shell 2 by 90°, so that the untested sides of the outer shell 2 face the rigid frame 3. At the same time, a localized, focused pressure-boosting mode was activated: During each retraction of the piston rod of the hydraulic cylinder 106, the spring telescopic rod 10 drives the rigid frame 3 and the movable plate 5 to reset. During each reciprocating movement of the rigid frame 3, the slider 904 is driven to slide synchronously along the arc-shaped slide groove 903. The turntable 902 can rotate freely along the bearing. The probability of the slider 904 entering the second arc-shaped slide groove 903 from the first arc-shaped slide groove 903 is random. The shape of each arc-shaped slide groove 903 is irregular and different. The radius of curvature, tilt angle and turning point of each slide groove are different. After the slider 904 enters any arc-shaped slide groove 903, it can trigger the turntable 902 to rotate at different amplitudes. When the turntable 902 rotates, the gear ring 907 fixedly connected to it rotates synchronously. The gear ring 907 meshes and drives the rack 906 in the limiting track 905 to slide irregularly back and forth. Due to the difference in shape of the arc-shaped slide groove 903, the sliding amplitude and frequency of the rack 906 are irregular. The rack 906 slides and connects with the limiting rod 908, which will drive the limiting rod 908 and the movable plate 5 to perform irregular back and forth movements. The wavy curved surface on the front of the movable plate 5 undulates with the movement, generating a differentiated thrust on the steel ball 4 in the rigid frame 3. Under the combined effects of the disturbance of the movable plate 5 and the deflection of the rigid frame 3, the steel balls 4 randomly accumulate in a local area, and the accumulation point is unpredictable. If a large number of steel balls 4 accumulate in a certain area, the steel balls 4 in that area will exert greater extrusion force on the outer shell 2 during continuous pressurization, and a local key pressurization test can be carried out. This test can be repeated many times, and each time the accumulation point of the steel balls 4 is random, and the local pressurization point is also random, which can simulate the unpredictable random extrusion scenario in actual work.

[0035] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A speed reducer housing strength testing device, comprising a platform (1) and an outer housing (2) placed on the upper surface of the platform (1), wherein two symmetrically distributed rigid frames (3) are provided on both sides of the outer housing (2), characterized in that: Both rigid frames (3) are filled with several steel balls (4), and the steel balls (4) can adapt to the concave and convex surfaces of the outer wall of the outer shell (2) to achieve full and uniform compression of the outer shell (2). The rigid frame (3) is stacked with a movable plate (5) and a positioning plate (9) on the outside. The movable plate (5) has several connecting mechanisms (6) on both sides of its back side for connecting the rigid frame (3). The movable plate (5) can agitate the steel ball (4) so ​​that the steel ball (4) will randomly displace inside the rigid frame (3), thereby increasing the local extrusion pressure on the outer shell (2).

2. The gearbox housing strength testing device according to claim 1, characterized in that: The connecting mechanism (6) includes a slide rail (601) fixedly connected to the back of the movable plate (5) and a pulley (602) that slides along the slide rail (601). A support rod (603) is rotatably connected to one side of the pulley (602). A rotating rod (604) is slidably connected to one end of the support rod (603). A connecting rod (605) is slidably connected to one end of the rotating rod (604) away from the support rod (603).

3. The gearbox housing strength testing device according to claim 2, characterized in that: One end of the connecting rod (605) is fixedly connected to the rigid frame (3). By squeezing the rigid frame (3), the connecting rod (605) is driven to move synchronously, and the rotating rod (604) is further driven to rotate, so that the rigid frame (3) and the movable plate (5) can move relative to each other. The inner side of the rigid frame (3) is equipped with a wire mesh (7), and the two sides and the top of the rigid frame (3) are fixedly connected with rubber baffles (8).

4. The gearbox housing strength testing device according to claim 1, characterized in that: The top of the positioning plate (9) is fixedly connected to a limiting frame (901), and one side of the limiting frame (901) is rotatably connected to a turntable (902) via a bearing. The surface of the turntable (902) is provided with several equally angled arc-shaped sliding grooves (903), and the several arc-shaped sliding grooves (903) are interconnected. The top of the rigid frame (3) is fixedly connected to a slider (904) that slides along the arc-shaped sliding grooves (903).

5. The gearbox housing strength testing device according to claim 4, characterized in that: The top of the limiting frame (901) is fixedly connected to a limiting track (905), and a rack (906) is slidably connected inside the limiting track (905). A toothed ring (907) is engaged on one side of the rack (906).

6. The gearbox housing strength testing device according to claim 5, characterized in that: The top of the turntable (902) is fixedly connected to the gear ring (907), and one end of the rack (906) is slidably connected to the limit rod (908), which is fixedly connected to the top of the movable plate (5).

7. The gearbox housing strength testing device according to claim 1, characterized in that: The back of the movable plate (5) is a flat structure, and the front of the movable plate (5) is a wavy curved surface structure. The top and bottom of the positioning plate (9) are equipped with spring telescopic rods (10) for connecting the positioning plate (9).

8. The gearbox housing strength testing device according to claim 1, characterized in that: The interior of the shelf (1) is rotatably connected to a two-way lead screw (101). Two connecting blocks (102) are slidably connected to the surface of the two-way lead screw (101), and a soft pad (103) is fixedly connected to the top of each connecting block (102). The soft pad (103) is tightly attached to both sides of the inner wall of the outer shell (2).

9. The gearbox housing strength testing device according to claim 1, characterized in that: The outer wall of the platform (1) is rotatably connected to an installation plate (104), the bottom of the platform (1) is equipped with the output shaft of a servo motor (105), and the upper surface of the installation plate (104) is provided with a hydraulic cylinder (106) corresponding to the position of the positioning plate (9).

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