Tractor rear axle assembly testing device

Abstract

The utility model relates to the technical field of tractor manufacturing, in particular to a tractor rear axle assembly testing device which comprises a base and further comprises a pair of supporting seats fixedly connected to the top of the base, a transverse sliding rod fixedly connected between the two supporting seats, and a pair of supports slidably installed on the side face of the transverse sliding rod. A two-way threaded rod is rotationally installed between the two supporting seats, the supports are in threaded connection with different threads of the two-way threaded rod, a main motor is fixedly connected to the left sides of the supporting seats, and a motor shaft of the main motor penetrates through the supporting seats and is fixedly connected with the two-way threaded rod. Clamping grooves are formed in the bottoms of the supports, the main motor drives the bidirectional threaded rod to rotate, the supports are driven to accurately move along the transverse sliding rods, the device can be rapidly matched with tractor rear axle assemblies with different widths, and stable clamping and positioning are achieved.

Description

Technical Field

[0001] This utility model relates to the field of tractor manufacturing technology, and in particular to a tractor rear axle assembly testing device. Background Technology

[0002] In the tractor manufacturing industry, the rear axle assembly is a core component, and its quality directly affects the overall performance of the machine. It must undergo rigorous testing before leaving the factory. Current testing equipment has significant shortcomings. For different models of rear axle assemblies, manual disassembly and replacement of corresponding tooling are required. Adjusting the bracket spacing relies on manually tightening bolts, which is cumbersome and time-consuming, and lacks positioning stability. The brackets only rely on simple sliding rails, lacking precise guidance and synchronous drive mechanisms, making them prone to lateral displacement during movement. Asynchronous movement of the two brackets leads to misalignment between the rear axle assembly and the testing benchmark after installation, making it difficult to meet the high-efficiency testing requirements of large-scale production.

[0003] The patent publication number "CN213688747U" discloses a "Bracket Assembly Braking Torque Testing Test Bench," which relates to the field of automotive parts testing technology. A main base and a secondary base are spliced ​​and installed. A main base buffer pad is laid on the upper surface of the main base, and a secondary base buffer pad is laid on the upper surface of the secondary base. Two hydraulic cylinders are installed on the main base buffer pads. A support plate is fixed above the hydraulic push rods of the two hydraulic cylinders, and a bridge placement seat is installed above the support plate. A braking mechanism is provided on both the left and right sides of the bridge placement seat. The two braking mechanisms are fixed on the main base buffer pads and are located outside the two hydraulic cylinders. Displacement sensors are installed on the two braking mechanisms. This test bench can meet various requirements for braking torque testing of axle assemblies. The hydraulic loading accuracy is high and the error is small, enabling comprehensive performance testing of the braking torque of automotive axle assemblies. Furthermore, the test data can be used for subsequent improvements and research and development of axle assembly manufacturing technology, demonstrating high innovation and practicality.

[0004] To address the aforementioned issues, existing tractor rear axle assembly testing devices employ a fixed-size positioning structure, relying solely on manually adjusting bolts to change the bracket spacing. This approach fails to provide rapid and precise adjustments based on the width of the rear axle assembly. When dealing with products of different specifications, multiple disassemblies and replacements of components or repeated adjustments are often required, resulting in poor adaptability, reduced testing efficiency, and a lack of reliable guidance and drive coordination. Furthermore, the devices are susceptible to skewing due to external forces during movement, and the movement of the two side brackets is difficult to synchronize, leading to misalignment of the rear axle assembly's support and positioning. This compromises positioning accuracy, impacting the reliability of subsequent test data and potentially causing unnecessary damage to the rear axle assembly during testing due to unstable positioning. Summary of the Invention

[0005] The purpose of this utility model is to provide a tractor rear axle assembly testing device, which solves the problems of poor adaptability of similar equipment to rear axle assemblies of different specifications, cumbersome positioning operation and low efficiency. At the same time, it solves the technical problems of traditional equipment bracket movement lacking reliable guidance and drive coordination, which is prone to skew, poor synchronization leading to positioning deviation, thus affecting the reliability of test data or even causing damage to the rear axle assembly.

[0006] To achieve the above objectives, this utility model provides a tractor rear axle assembly testing device, including a base;

[0007] It also includes a pair of support seats fixedly connected to the top of the base, and a transverse slide rod fixedly connected between the two support seats.

[0008] A pair of brackets are slidably connected to the side of the transverse slide rod, and a bidirectional threaded rod is rotatably connected between the two support seats. The brackets are screwed onto different threads of the bidirectional threaded rod. A main motor is fixedly connected to the left side of the support seat. The motor shaft of the main motor passes through the support seat and is fixedly connected to the bidirectional threaded rod. The bottom of each bracket is provided with a slot.

[0009] The base has support plates fixedly connected to both sides, and a main electric actuator is fixedly connected to the side of the support plate. The output end of the main electric actuator passes through the support plate and is fixedly connected to an outer frame. The outer frame is slidably connected to the top of the base. A slide rail is fixedly connected to the top of the base. A slide groove is provided at the bottom of the outer frame. The bottom slide groove of the outer frame is slidably connected to the outside of the slide rail.

[0010] The outer frame has a secondary electric actuator fixedly connected to its inner bottom, a slide plate fixedly connected to the top of the output end of the secondary electric actuator, a vertical slide bar fixedly connected between the inner bottom and top of the outer frame, the slide plate slidably connected to the outside of the vertical slide bar, a spring fixedly connected between the inner top of the outer frame and the top of the slide plate, the spring being sleeved on the outside of the vertical slide bar, and a detection head fixedly connected to the inner top of the outer frame.

[0011] The skateboard has a fixed plate fixedly connected to its top, a secondary motor fixedly connected to the outer side of the fixed plate, and an output shaft of the secondary motor passing through the fixed plate and having a clamping assembly. The clamping assembly includes a turntable, which is fixedly connected to the top of the output shaft of the secondary motor. A fixed frame is fixedly connected to the side of the turntable, and a pair of threaded holes are opened on the side of the fixed frame. A fixing bolt is screwed into the threaded hole, and a clamping plate is rotatably connected to the top of the fixing bolt. An anti-slip pad is fixedly connected to the side of the clamping plate.

[0012] The base has vertical support columns fixedly connected to its four corners. The support columns are made of high-strength alloy material, and each support column is rotatably connected to casters via a pivot.

[0013] The base has a hydraulic rod fixedly connected to its top, and the output end of the hydraulic rod passes through the hydraulic rod and is fixedly connected to a rubber support. The bottom surface of the rubber support is provided with fine anti-slip protrusions.

[0014] This utility model discloses a tractor rear axle assembly testing device. A main motor drives a bidirectional threaded rod to rotate, causing a bracket to move precisely along a transverse slide bar. This allows the device to quickly adapt to tractor rear axle assemblies of different widths, achieving stable clamping and positioning. It solves the problems of poor adaptability and cumbersome positioning associated with traditional devices for different specifications of rear axle assemblies. By sliding the bracket onto the transverse slide bar and connecting it to the bidirectional threaded rod, combined with the drive of the main motor, the bracket's movement exhibits good synchronicity and stability, ensuring accurate and reliable support and positioning of the rear axle assembly. This overcomes the shortcomings of traditional positioning structures, such as easy misalignment and insufficient stability. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0016] Figure 1 This is a schematic diagram of the external structure of an embodiment of the present utility model.

[0017] Figure 2 This is a front structural diagram of an embodiment of the present utility model.

[0018] Figure 3 This is a side view of an embodiment of the present invention.

[0019] Figure 4 This is a side anatomical diagram of an embodiment of the present invention.

[0020] Figure 5 This is an embodiment of the present utility model. Figure 4 Enlarged view of the structure at point A in the middle.

[0021] 1. Base; 2. Two-way threaded rod; 3. Support seat; 4. Horizontal slide bar; 5. Bracket; 6. Main motor; 7. Support plate; 8. Slide rail; 9. Main electric push rod; 10. Outer frame; 11. Hydraulic rod; 12. Rubber support; 13. Column; 14. Universal wheel; 15. Secondary electric push rod; 16. Slide plate; 17. Fixing plate; 18. Secondary motor; 19. Vertical slide bar; 20. Spring; 21. Clamping assembly; 211. Turntable; 212. Fixing frame; 213. Fixing bolt; 214. Anti-slip pad; 215. Clamping plate; 22. Detection head. Detailed Implementation

[0022] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0023] Please see Figures 1-5 .

[0024] A tractor rear axle assembly testing device includes a base 1;

[0025] It also includes a pair of support seats 3 fixedly connected to the top of the base 1, and a horizontal slide bar 4 fixedly connected between the two support seats 3.

[0026] A pair of brackets 5 are slidably connected to the side of the transverse slide bar 4. A bidirectional threaded rod 2 is rotatably connected between the two support seats 3. The brackets 5 are screwed onto different threads of the bidirectional threaded rod 2. A main motor 6 is fixedly connected to the left side of the support seat 3. The motor shaft of the main motor 6 passes through the support seat 3 and is fixedly connected to the bidirectional threaded rod 2. The bottom of each bracket 5 is provided with a slot.

[0027] First, the base 1 is welded from steel plate, with the bottom subjected to aging treatment to eliminate internal stress, and the top surface precision machined to ensure flatness. A pair of support seats 3 are symmetrically fixed to the top of the base 1 via bolts. The support seats 3 are cast steel parts and have undergone heat treatment. The two support seats 3 are symmetrically distributed and are connected by a transverse slide rod 4 via a flange and bolts. The transverse slide rod 4 is made of high-strength alloy material and has a chrome-plated and polished surface to reduce friction. A pair of brackets 5 are slidably connected to the side of the transverse slide rod 4. The brackets 5 are forged from high-strength material, and wear-resistant sleeves are embedded in their sliding holes to reduce wear. A double-threaded rod 2 is rotatably connected between the two support seats 3 via bearings. The threads at both ends of the threaded rod have opposite directions, and the threaded holes at the bottom of the brackets 5 mate with the threaded rod. The main motor 6 is fixedly connected to the left side of the support seat 3 via a motor mount. Its output shaft passes through the support seat 3 via a coupling and is rigidly connected to the left end of the double-threaded rod 2. The bottom groove of the bracket 5 has a U-shaped structure with a rubber buffer layer pasted on the inside to adapt to the upper crossbeams of different specifications of rear axle assemblies.

[0028] Furthermore, support plates 7 are welded and fixed to both sides of the base 1. The support plates 7 are made of thick steel plates and are annealed after welding to relieve stress. A main electric actuator 9 is bolted to the outside of the support plates 7. The electric actuator is a high-precision transmission type. The output end of the main electric actuator 9 passes through the support plates 7 and is then bolted and fixed to an outer frame 10 via a flange. The outer frame 10 is made of alloy profiles and reinforced at the corners with corner brackets. Two parallel slide rails 8 are fixed to the top of the base 1 via countersunk bolts. The slide rails 8 are high-strength structures and are hardened to improve hardness. Corresponding grooves are formed at the bottom of the outer frame 10, and precision rolling sliders are installed in the grooves, allowing the outer frame 10 to slide smoothly along the slide rails 8.

[0029] Furthermore, a secondary electric actuator 15 is bolted to the center of the bottom inner side of the outer frame 10. This actuator has a position feedback function. A sliding plate 16, made of thick steel plate with a blackened surface, is threaded to the top of the output end of the secondary electric actuator 15 and fixed to a lock nut. Four vertical sliding rods 19, made of high-strength material and surface-hardened, are bolted to the bottom and top of the inner side of the outer frame 10. These rods are arranged in a rectangular array at the four corners of the sliding plate 16, with corresponding sliding holes on the sliding plate 16 that mate with the rods. A spring 20, made of high-strength material, is fixed between the top inner side of the outer frame 10 and the top of the sliding plate 16. This spring is fitted onto the outside of the vertical sliding rods 19 and has a pre-compression. A detection head 22, a laser displacement sensor, is fixed to the top inner side of the outer frame 10 via a bracket for real-time monitoring of the displacement changes of the sliding plate 16.

[0030] Furthermore, a fixing plate 17 is fixedly connected to the top of the skateboard 16 via positioning pins and bolts. The fixing plate 17 is made of thick steel plate to ensure good flatness. A secondary motor 18 is fixedly connected to the outside of the fixing plate 17 via a motor bracket. The motor is an adjustable speed model and equipped with an encoder. The output shaft of the secondary motor 18 passes through the fixing plate 17 via a bearing, and the end is connected to a clamping assembly 21 via a flat key. The assembly includes a turntable 211, which is made of high-strength material with heat treatment to ensure good end face precision. A fixing frame 212 is fixedly connected to the side of the turntable 211 via welding. The fixing frame is a U-shaped steel plate structure with a pair of threaded holes on opposite sides. Fixing bolts 213 are screwed into the threaded holes. The bolts are high-strength bolts. A clamping plate 215 is rotatably connected to the top via a bearing. The clamping plate has an arc-shaped structure to fit the rear axle half shaft. An anti-slip pad 214 is fixedly connected to the inside of the clamping plate via adhesive. The anti-slip pad is made of high-elasticity material with anti-slip texture pressed on the surface to increase friction.

[0031] Furthermore, the four corners of the base 1 are fixedly connected to the support column 13 by welding. The support column is a seamless steel pipe made of high-strength steel. The bottom is rotatably connected to the caster wheel 14 through the bearing seat. The caster wheel is a heavy-duty wheel with strong load-bearing capacity and is equipped with a double brake stop mechanism.

[0032] Furthermore, four hydraulic rods 11 are bolted to the top of the base 1 near the four corners. These hydraulic rods are single-acting piston type. The bottom of the cylinder is connected to the built-in hydraulic station of the base 1 via a high-pressure oil pipe, which has high pressure resistance. After the output end of the hydraulic rod 11 passes through the cylinder, it is fixedly connected to a rubber support 12 via a threaded connection. The support is a circular structure made of natural rubber, and the bottom surface is integrally molded with anti-slip protrusions. During operation, the hydraulic rod pushes the rubber support down, and the universal wheel brakes provide dual stability.

[0033] Furthermore, the detection head 22 also includes a pressure sensor connected to the inside of the slot of the bracket 5. Together with the laser displacement sensor, it is connected to the control cabinet on one side of the base 1 through a shielded data cable. It can display and record parameters such as stress, strain, and displacement changes during the rear axle assembly test in real time, and has a large storage capacity to save test data.

[0034] Overall workflow:

[0035] First, the main motor 6 drives the bidirectional threaded rod 2 to rotate, causing the two brackets 5 to move towards or away from each other along the transverse slide bar 4. The slots at the bottom of the brackets 5 provide positioning support for the upper part of the rear axle assembly. Then, the main electric push rod 9 pushes the outer frame 10 to move along the slide rail 8, adjusting the relative position of the clamping assembly 21 and the rear axle assembly. The secondary electric push rod 15 drives the slide plate 16 to rise and fall along the vertical slide bar 19, with the spring 20 providing cushioning, so that the clamping assembly 21 is close to the end of the rear axle assembly. Then, the fixing bolt 213 drives the clamping plate 215 and the anti-slip pad 214 to clamp and fix the rear axle half shaft. During testing, the secondary motor 1... 8 drives the turntable 211 to rotate with the clamped rear axle assembly, simulating its working state. At the same time, the detection head 22 on the top inner side of the outer frame 10 and the pressure sensor in the slot of the bracket 5 work together to monitor the displacement changes and stress strain in real time during the test. When the device moves, it relies on the universal wheels 14 under the bottom support column 13 for flexible transportation. During the test, the hydraulic rod 11 pushes the rubber support 12 to contact the ground, and the universal wheels 14 brake to achieve overall stability, ensuring that the test process is stable and reliable. All the components of the entire device work together under the support of the base 1 to complete various tests on the tractor rear axle assembly.

[0036] The above-disclosed embodiments are merely one or more preferred embodiments of this application and should not be construed as limiting the scope of this application. Those skilled in the art can understand that all or part of the processes for implementing the above embodiments and equivalent changes made in accordance with the claims of this application still fall within the scope of this application.

Claims

1. A tractor rear axle assembly testing device, comprising a base, characterized in that: It also includes a pair of support seats fixedly connected to the top of the base, and a transverse slide rod fixedly connected between the two support seats. A pair of brackets are slidably connected to the side of the transverse slide rod, and a bidirectional threaded rod is rotatably connected between the two support seats. The brackets are screwed onto different threads of the bidirectional threaded rod. A main motor is fixedly connected to the left side of the support seat. The motor shaft of the main motor passes through the support seat and is fixedly connected to the bidirectional threaded rod. The bottom of each bracket is provided with a slot.

2. The tractor rear axle assembly testing device according to claim 1, characterized in that: Both sides of the base are fixedly connected to support plates, and the sides of the support plates are fixedly connected to main electric actuators. The output end of the main electric actuator passes through the support plates and is fixedly connected to an outer frame. The outer frame is slidably connected to the top of the base. The top of the base is fixedly connected to a slide rail. The bottom of the outer frame is provided with a slide groove, and the bottom slide groove of the outer frame is slidably connected to the outside of the slide rail.

3. The tractor rear axle assembly testing device according to claim 2, characterized in that: A secondary electric actuator is fixedly connected to the bottom inner side of the outer frame. A slide plate is fixedly connected to the top of the output end of the secondary electric actuator. A vertical slide rod is fixedly connected between the bottom and top inner side of the outer frame. The slide plate is slidably connected to the outside of the vertical slide rod. A spring is fixedly connected between the top inner side of the outer frame and the top of the slide plate. The spring is sleeved on the outside of the vertical slide rod. A detection head is fixedly connected to the top inner side of the outer frame.

4. The tractor rear axle assembly testing device according to claim 3, characterized in that: A fixed plate is fixedly connected to the top of the skateboard, and a secondary motor is fixedly connected to the outer side of the fixed plate. The output shaft of the secondary motor passes through the fixed plate and is provided with a clamping assembly. The clamping assembly includes a turntable, which is fixedly connected to the top of the output shaft of the secondary motor. A fixed frame is fixedly connected to the side of the turntable. A pair of threaded holes are opened on the side of the fixed frame. A fixing bolt is screwed into the inside of the threaded holes. A clamping plate is rotatably installed on the top of the fixing bolt. An anti-slip pad is fixedly connected to the side of the clamping plate.

5. The tractor rear axle assembly testing device according to claim 1, characterized in that: The base has vertical support columns fixedly connected to the four corners of its bottom. The support columns are made of high-strength alloy material, and the bottom of each support column is rotatably connected to casters via a pivot.

6. The tractor rear axle assembly testing device according to claim 1, characterized in that: A hydraulic rod is fixedly connected to the top of the base. The output end of the hydraulic rod passes through the hydraulic rod and is fixedly connected to a rubber support. The bottom surface of the rubber support is provided with fine anti-slip protrusions.

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