Load life testing machine for rod end knuckle bearing

Abstract

The utility model relates to a load life testing machine for a rod end knuckle bearing, which comprises the rod end knuckle bearing, a hydraulic jack, a numerical control system, an operation screen, a servo motor, a coupler, a flat key pin, a linear guide rail, a sliding block, a guide rail limiter, a screw rod, a nut, a screw rod supporting seat, a nut seat, a heightening block, a flat plate, a circular shaft and a bolt. The number is determined according to specific conditions; the experimental equipment is used for testing life times of a rod end knuckle bearing under rated load, a numerical control system is used for setting a test program, a servo motor is used for providing power, transmission and linear reciprocating motion are completed through a coupler and a lead screw, a flat plate and a circular shaft which are fixed on a guide rail and a sliding block are driven, and the lead screw and a nut are used for driving. Wherein the circular shaft penetrates into a central hole of an inner ring of the rod end knuckle bearing, so that the inner ring does deflection motion at a certain angle relative to the rod end, and meanwhile, a hydraulic jack and a thrust ball bearing are arranged below the rod end and provide loading force from bottom to top.

Description

Technical Field

[0001] The utility model relates to the field of mechanical structures, in particular to a load life testing machine for a rod end joint bearing. Technical Background

[0002] Rod end joint bearings are spherical sliding bearings. The basic type consists of inner and outer rings with spherical sliding spherical contact surfaces. Joint bearings are mainly composed of an inner ring with an outer spherical surface and an outer ring with an inner spherical surface, and can withstand large loads. Depending on its type and structure, it can withstand radial loads, axial loads, or a combined load of radial loads and axial loads. Since a composite material is attached to the outer spherical surface of the inner ring, the bearing can generate self-lubrication during operation. It is generally used for low-speed swinging motion, tilting motion and rotational motion.

[0003] Because the spherical sliding contact area and inclination angle of spherical bearings are large, and most spherical bearings adopt special process treatment methods, such as surface phosphating, chrome plating or external sliding surface lining, gasketing, spraying, etc., they have greater load capacity and impact resistance, and are corrosion-resistant, wear-resistant, self-aligning, oil-lubricated or self-lubricated without lubricating dirt pollution.

[0004] Usually, during the swinging process of the rod end joint bearing, the sliding surface will wear out. After the wear exceeds a certain amount, the rod end joint bearing can no longer work normally. The temperature of the rod end joint bearing will slowly rise as the rod end joint bearing operates, and will reach a stable state after 1-2 hours. The normal temperature of the rod end joint bearing varies depending on the speed and load of the machine. If the lubrication and installation are not appropriate, the temperature of the rod end joint bearing will rise sharply, eventually causing product damage. Utility Model Content

[0005] The utility model provides a load life testing machine for a rod end joint bearing in order to test the service life of the rod end joint bearing under a certain fixed load, and the advantages thereof are:

[0006] 1. The rated load during use is simulated and loaded onto the test object by means of a hydraulic jack.

[0007] 2. Simulate usage requirements and control and simulate the runout angle of the inner ring of the rod end joint bearing during the test.

[0008] 3. Record the number of cycles on the display screen of the CNC control system, and measure the clearance between the inner and outer rings of the rod end bearing in radial, axial or a fixed direction every time the number reaches an integer multiple of 10W times, analyze and determine a standard from multiple aspects, and use this as an indicator to judge the life of the rod end bearing under rated load.

[0009] 4. The materials of the test equipment are mostly resistant to high temperatures, and the equipment structure is easy to dissipate heat, so the life test of the rod end joint bearing will not be affected by ambient temperature factors.

[0010] 5. The test machine is exquisitely designed and practical, with stable and reliable working performance. The four most core elements required for the load life test of the rod end joint bearing: speed, inner ring deflection angle, load and number of times can all be completed through one test. A load life test machine for a rod end joint bearing, with a numerical control system to set the test program, a servo motor (2) to provide power, the servo motor is connected to a screw rod (17) through a coupling (23), the servo motor drives the screw rod to make reciprocating motion, the servo motor and the screw rod drive a plate (20) and a round shaft fixed on a linear guide slider (22), the servo motor drives the plate (20) and the round shaft with a screw rod (17) and a nut, wherein the round shaft is inserted into the center hole of the inner ring of the rod end joint bearing, thereby causing the inner ring to make a certain angle of deflection relative to the rod end, and a hydraulic jack and a thrust ball bearing are installed below the rod end to provide a load force from bottom to top.

[0011] Preferably, the experimental apparatus is composed of a rod end joint bearing, a hydraulic jack, a CNC control system and an operating screen, a servo motor, a coupling, a flat key pin, a linear guide slider, a guide limiter, a screw, a nut, a screw support seat, a nut seat, a heightening block, a plate, a round shaft and bolts, and the quantity depends on the specific situation.

[0012] Preferably, hydraulic jacks are responsible for providing the load.

[0013] Preferably, the operation screen of the numerical control system records the number of cycles of the linear motion of the lead screw nut, and uses this as a life data indicator of the rod end joint bearing under the rated load.

[0014] Preferably, the numerical control system sets the program and the servo motor is responsible for providing power to control the movement speed, direction and stroke of the lead screw nut, thereby indirectly controlling the yaw movement angle of the inner ring of the rod end joint bearing relative to the rod end.

[0015] Preferably, the servo motor and the lead screw are connected via a coupling and a flat key pin to achieve linear reciprocating motion of the nut on the lead screw.

[0016] Preferably, a thrust ball bearing is provided between the hydraulic jack and the fixture for auxiliary fixation of the rod end joint bearing, and the thrust ball bearing is used to assist in completing the yaw motion of the test object.

[0017] Preferably, the heightening blocks are fixedly assembled on the linear guide sliders on both sides of the screw rod and fixed on the same flat plate with the nut seats of the screw rod nut. At the same time, the round shaft passing through the center hole of the steel ball of the rod end joint bearing is fixed above the flat plate through an auxiliary tooling fixture, so that the linear reciprocating motion of the screw rod can smoothly drive the oscillating motion of the inner ring of the rod end joint bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural diagram of the load life testing machine.

[0019] Figure 2 This is a schematic diagram of the temperature sensor monitoring the rod end operation in real time.

[0020] Figure 3 Schematic diagram for measuring the inner ring clearance of rod end joint bearings.

[0021] Figure 4 Schematic diagram of the swinging motion of the inner ring of the rod end bearing as the lead screw moves linearly.

[0022] The accompanying drawings are marked as follows:

[0023] 1. Nut seat; 2. Servo motor; 3. CNC control system; 4. Hydraulic jack; 5. Pad; 6. Thrust ball bearing; 7. U-block 1; 8. Rod end bearing; 10. Temperature sensor; 11. Magnetic base; 12. Micrometer; 13. Optical axis; 14. Long round pin; 15. U-block 2; 16. Steel sleeve; 17. Screw rod; 18. Support seat; 19. Guide rail limiter; 20. Plate; 21. Heightening block; 22. Linear guide slider; 23. Coupling; 24. Sensor line. DETAILED DESCRIPTION

[0024] like Figure 1-4 As shown, the load life test machine sets the test program with a numerical control system 3, and the servo motor (2) provides power. The servo motor is connected to the screw rod (17) through a coupling (23). The servo motor drives the screw rod to make reciprocating motion. The servo motor and the screw rod drive the plate (20) and the round shaft fixed on the linear guide slider (22). The servo motor drives the plate (20) and the round shaft with the screw rod (17) and the nut. The round shaft is inserted into the center hole of the inner ring of the rod end joint bearing 8, thereby causing the inner ring to make a certain angle of oscillation relative to the rod end. At the same time, a hydraulic jack 4 and a thrust ball bearing 6 are installed below the rod end to provide a load force from bottom to top.

[0025] The experimental apparatus consists of a rod end joint bearing 8, a hydraulic jack 4, a CNC control system 3 and an operation screen, a servo motor 2, a coupling 23, a flat key pin, a linear guide slider 22, a guide limiter 19, a screw 17, a nut, a screw 17 support seat 18, a nut seat 1, a heightening block 21, a plate 20, a round shaft and bolts, and the quantity depends on the specific situation.

[0026] The operation screen of the numerical control system 3 records the number of cycles of the linear motion of the screw 17 nut, and uses this as a life data indicator of the rod end joint bearing 8 under the rated load.

[0027] The numerical control system 3 sets the program, and the servo motor 2 is responsible for providing power to control the movement speed, direction and stroke of the screw 17 nut, thereby indirectly controlling the yaw movement angle of the inner ring of the rod end joint bearing 8 relative to the rod end. The servo motor 2 and the screw 17 are connected through the coupling 23 and the flat key pin to complete the linear reciprocating motion of the nut on the screw 17.

[0028] The hydraulic jack 4 is responsible for providing the load. A thrust ball bearing 6 is provided between the hydraulic jack 4 and a fixture for auxiliary fixation of the rod end joint bearing 8. The thrust ball bearing 6 is used to assist in completing the yaw motion of the test object.

[0029] The heightening blocks 21 are fixedly assembled on the linear guide sliders 22 on both sides of the screw rod 17, and are fixed on the same flat plate 20 together with the nut seat 1 of the screw rod 17 nut. At the same time, the round shaft passing through the center hole of the steel ball of the rod end joint bearing 8 is fixed above the flat plate 20 through an auxiliary tooling fixture, so that the linear reciprocating motion of the screw rod 17 can smoothly drive the oscillating motion of the inner ring of the rod end joint bearing 8.

[0030] Installation method Figure 1 The screw rod 17, nut, nut seat 1 and screw rod 17 support seat 18 are installed and fixed on the working plane, and connected and fixed to the servo motor 2 through the coupling 23 and the flat key pin. Then the servo motor 2 is connected to the CNC control system 3, and the program is set on its operation screen to determine the speed, direction and stroke of the linear motion of the screw rod 17.

[0031] There are two groups of linear guide sliders 22, which include linear guides and sliders. The two groups of linear guides are installed on both sides of the screw rod 17 in the same direction, keeping a certain distance from each other, and then the sliders are installed. Guide limiters 19 are installed at both ends of the linear guide sliders 22.

[0032] Fix the two heightening blocks 21 on the linear guide slider 22 with bolts. The height of the heightening block 21 needs to be slightly higher than the height of the nut seat 1 of the screw rod 17, and then cover it with a plate 20, and lock the plate 20 on the nut seat of the heightening block 21 and the screw rod 17 with bolts.

[0033] Select a good position on this plate 20, put two steel sleeves 16, put a U-shaped block 2 15 on top of the steel sleeve 16, and lock it on the plate 20 with bolts. A small hole will be punched in the two side plates of the U-shaped block 2 15 for the long round pin 14 to pass smoothly.

[0034] according to Figure 1 In a manner, two rows of optical axes 13 are bolted on both sides of the hydraulic jack 4, and a square plate is also bolted on the top of the optical axis 13. A connecting plate is locked under the square plate, and an internal threaded through hole is punched in the middle of the connecting plate to cooperate with the external thread of the rod end joint bearing 8.

[0035] A temperature sensor 10 and a sensing wire 24 are provided on the square plate. The temperature sensor 10 is fixed on the square plate. One end of the sensing wire 24 is connected to the temperature sensor 10, and the other end of the sensing wire 24 is connected to the rod end joint bearing 8. A guide rail slider is also provided on the square plate. A magnetic table base 11 is provided on the guide rail slider. The guide rail slider can drive the magnetic table base 11 to move left and right. A micrometer 12 is provided under the magnetic table base 11. A detection plane is provided on the circular shaft, and the micrometer 12 abuts against the detection plane.

[0036] according to Figure 1 Install the rod end joint bearing 8 upside down and fix it with a nut, take another round shaft and insert it into the U-shaped block 7 and the inner ring of the rod end joint bearing 8 at the same time. Note that this round shaft needs to be leveled up and down on the side facing the screw rod 17, and a through hole with a keyway profile needs to be punched to allow the long round pin 14 to pass smoothly.

[0037] Align the horizontal position of the circular shaft parallel to the U-shaped block 15, and then take a long round pin 14 to pass through the U-shaped block 15 and the circular shaft in sequence until the lower end abuts against the flat plate 20.

[0038] A hydraulic jack 4 is placed under the rod end joint bearing 8, covered with an intermediate plate, and a thrust ball bearing 6 is placed on the intermediate plate. After adjusting the position, the hydraulic jack 4 can apply a load force from bottom to top.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A load life testing machine for a rod end joint bearing, characterized in that: The test program is set by a numerical control system (3), and the servo motor (2) provides power. The servo motor is connected to the screw rod (17) through a coupling (23). The servo motor drives the screw rod to make reciprocating motion. The servo motor and the screw rod drive the plate (20) and the round shaft fixed on the linear guide slider (22). The servo motor drives the plate (20) and the round shaft with the screw rod (17) and the nut. The round shaft is inserted into the center hole of the inner ring of the rod end joint bearing (8), thereby causing the inner ring to make a certain angle of oscillation relative to the rod end. At the same time, a hydraulic jack (4) and a thrust ball bearing (6) are installed below the rod end to provide a load force from bottom to top. The experimental apparatus comprises a rod end joint bearing (8), a hydraulic jack (4), a numerical control system (3) and an operation screen, a servo motor (2), a coupling (23), a flat key pin, The invention comprises a linear guide slider (22), a guide limiter (19), a screw rod (17), a nut, a screw rod (17) support seat (18), a nut seat (1), an increase block (21), a plate (20), a round shaft and bolts; the servo motor (2) and the screw rod (17) are connected with a flat key pin via a coupling (23) to complete the linear reciprocating motion of the nut on the screw rod (17); the increase block (21) is fixedly assembled on the linear guide slider (22) on both sides of the screw rod (17), and is fixed on the same plate (20) with the nut seat (1) of the screw rod (17); at the same time, the round shaft inserted into the center hole of the steel ball of the rod end joint bearing (8) is fixed on the top of the plate (20) via an auxiliary fixture, so that the linear reciprocating motion of the screw rod (17) can smoothly drive the yaw motion of the inner ring of the rod end joint bearing (8).

2. The load life testing machine according to claim 1, characterized in that: The hydraulic jack (4) is responsible for providing the load.

3. The load life testing machine according to claim 2, characterized in that: The operation screen of the numerical control system (3) records the number of cycles of the linear motion of the screw rod (17) nut, and uses this as a life data indicator of the rod end joint bearing (8) under the rated load.

4. The load life testing machine according to claim 2, characterized in that: The numerical control system (3) sets the program, and the servo motor (2) is responsible for providing power to control the movement speed, direction and stroke of the screw (17) nut, thereby indirectly controlling the yaw movement angle of the inner ring of the rod end joint bearing (8) relative to the rod end.

5. The load life testing machine according to claim 2, characterized in that: A thrust ball bearing (6) is arranged between the hydraulic jack (4) and the fixture for auxiliary fixing of the rod end joint bearing (8), and the thrust ball bearing (6) is used to assist in completing the yaw motion of the test object.

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