A forward and reverse heavy-duty coupling fatigue life accelerated testing test bench

Abstract

The present invention discloses a fatigue life accelerated testing test bench for a reversible heavy-duty coupling, comprising a drive system, a swing angle adjustment system, a reversible heavy-duty coupling, and a braking system. Driven by a reversible motor and loaded by the braking system, the system simulates the reaction force of the rolled material during rolling by controlling the load, speed, and stroke of the brake hydraulic cylinder. Combined with the start / stop, acceleration, and reversible control of the reversible motor, the torsional loads experienced during the start-up, steel-biting, and reversing stages of steel rolling can be simulated, enabling fatigue acceleration testing to verify whether the fatigue strength of the reversible heavy-duty coupling meets requirements.

Description

Technical Field

[0001] The present invention relates to the field of fatigue testing, and in particular to a forward-reversing heavy-duty coupling fatigue life accelerated testing test bench. Background Art

[0002] As core equipment widely used in the main rolling drive systems of major steel mills, the reliable and stable operation of heavy-duty couplings directly determines the capacity and quality of steel production. However, during the rolling process, the couplings are subject to complex and variable operating conditions and significant torsional shock, making them susceptible to fatigue cracking, which seriously impacts the safe and stable production of rolling operations. Therefore, an accelerated fatigue life test bench for heavy-duty couplings has been developed to verify the fatigue life of these couplings. This is of great significance for the safe and stable operation of steel processing lines. Summary of the Invention

[0003] The purpose of the present invention is to address the above-mentioned problems in the prior art and to provide a forward and reverse heavy-duty coupling fatigue life accelerated detection test bench for detecting whether the fatigue strength of the forward and reverse heavy-duty coupling meets the requirements.

[0004] To achieve the above object, the technical solutions adopted by the present invention are as follows:

[0005] A forward and reverse heavy-duty coupling fatigue life acceleration detection test bench comprises a drive system, a swing angle adjustment system, a forward and reverse heavy-duty coupling and a braking system.

[0006] The braking system includes a brake shaft, a wear-resistant layer, a brake hydraulic cylinder, a brake disc, a torque sensor, a bearing, a speed sensor, a slide, a displacement sensor, and a guide rail; the brake shaft includes a brake shaft head, a brake shaft section, and a brake shaft support section; the brake shaft head and the flat head are connected by an interference fit through the brake shaft head mounting hole; the wear-resistant layer is connected to the outer surface of the brake shaft section by bolts; the brake disc contacts the wear-resistant layer during braking; the brake disc is connected to the brake oil cylinder; a speed sensor is installed on the side surface of the bearing; the bearing is installed on the slide, the slide and the guide rail can slide relative to each other, and the slide monitors the sliding distance of the slide through a sensor installed on the guide rail;

[0007] The swing angle adjustment system includes an articulated joint, a swing angle adjustment head, a hydraulic cylinder, a shaft head, and a torque sensor. The articulated joint contains a pin hole, which is connected to a pin shaft inside the articulated box. The swing angle adjuster is connected to the cylinder, which is fixed to the ground through a revolute pair. The torque sensor is installed on the outer surface of the shaft head.

[0008] The drive system includes a bearing, a speed sensor, a motor, a bearing, a reduction gear box, and an articulated box. The speed sensor is installed on the side surface of the bearing. The motor is a forward and reverse motor. The articulated box contains a pin shaft.

[0009] The forward and reverse heavy-duty coupling includes a fork, a slider, and a flat head. A shaft head mounting hole is opened at the end of the fork, and the fork is interference fit with the shaft head in the swing angle adjustment system through the shaft head mounting hole; the fork and the slider are clearance fit, and relative swing can occur between the two; the flat head and the slider are clearance fit, and the two can expand and contract relative to each other along the axial direction; a brake shaft head mounting hole is opened at the end of the flat head.

[0010] The relative swing angle θ between the fork head and the flat head of the forward and reverse heavy coupling is plus or minus 5 0 .

[0011] In the forward and reverse heavy-duty coupling, the relative telescopic distance between the flat head and the fork head is L, and L=200~-50mm.

[0012] The beneficial effects of the present invention are as follows: it is driven by a forward and reverse motor, the load is provided by the braking system, and the load, speed and stroke of the brake hydraulic cylinder are controlled to simulate the reaction force of the rolled material during rolling; the start and stop, acceleration and forward and reverse control of the forward and reverse motor are combined to simulate the torsional loads in the starting, biting and throwing, and forward and reverse stages of steel rolling, so that fatigue acceleration tests can be carried out to check whether the fatigue strength of the forward and reverse heavy-duty coupling meets the requirements, and can provide important test basis for the fatigue life evaluation of the forward and reverse heavy-duty coupling. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall composition of the present invention.

[0014] Figure 2 Schematic diagram of the drive system structure of the present invention.

[0015] Figure 3 It is a structural schematic diagram of the swing angle adjustment system of the present invention.

[0016] Figure 4 This is a schematic structural diagram of the forward and reverse rotating heavy-duty coupling of the present invention.

[0017] Figure 5 It is a schematic structural diagram of the braking system of the present invention.

[0018] In the figure: 1. Bearing; 2. Speed ​​monitoring sensor; 3. Motor; 4. Bearing; 5. Reducer; 6. Articulated box; 61. Pin; 7. Articulated head; 71. Pin hole; 8. Swing angle adjustment head; 9. Hydraulic cylinder; 91. Rotating pair; 10. Shaft head; 11. Torque sensor; 12. Fork head; 121. Shaft head mounting hole; 13. Slider; 14. Flat head; 141. Brake shaft head mounting hole; 15. Brake shaft; 151. Brake shaft head; 152. Brake shaft section; 153. Brake shaft support section; 16. Wear-resistant layer; 17. Brake hydraulic cylinder; 18. Brake disc; 19. Bearing; 20. Speed ​​sensor; 21. Slide; 22. Displacement sensor; 23. Guide rail. DETAILED DESCRIPTION

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0020] Figure 1 Shown: A forward and reverse heavy-duty coupling fatigue life accelerated detection test bench, including a drive system, a swing angle adjustment system, a forward and reverse heavy-duty coupling, and a braking system. The four systems are connected in sequence from left to right.

[0021] Figure 2 As shown, the drive system includes a bearing 1, a speed sensor 2, a motor 3, a bearing 4, a reduction gearbox 5, and an articulation box 6. The speed sensor 2 is mounted on the left side of the bearing 1 to monitor the speed of the motor 3. The motor 3 is a forward-reversible motor with controllable forward and reverse rotation. The articulation box 6 contains a pin 61 for connecting to a pin hole 71 in the swing angle adjustment system.

[0022] Figure 3 As shown, the swing angle adjustment system includes an articulated joint 7, a swing angle adjustment head 8, a hydraulic cylinder 9, a shaft head 10, and a torque sensor 11. The articulated joint 7 contains a pin hole 71, which is connected to the pin shaft 61 inside the articulated box 6 through the pin hole 71. The swing angle adjuster 8 is connected to the cylinder 9. By controlling the stroke of the cylinder 9, the relative swing angle θ between the fork head 12 and the flat head 14 can be adjusted. The cylinder 9 is fixed to the ground via a revolute pair 91. The torque sensor 11 is mounted on the outer surface of the shaft head 10 and is used to monitor the torque value transmitted by the shaft head 10.

[0023] Figure 4 As shown: The forward and reverse heavy-duty coupling includes a fork 12, a slider 13, and a flat head 14. The fork 12 has a shaft mounting hole 121 at its end, through which the fork 12 is connected to the shaft 10 in the swing angle adjustment system by an interference fit. The right side of the fork 12 and the slider 13 are clearance fit, allowing the right side of the fork 12 and the slider 13 to swing relative to each other. The swing angle θ is represented by θ. The range of the swing angle θ is plus or minus 5 0The left side of the flat head 14 has a clearance fit with the slider 13, allowing the flat head 14 and the slider 13 to expand and contract relative to each other in the axial direction. The relative expansion and contraction distance L between the left side surface of the flat head 14 and the left side surface of the slider 13 ranges from 200 to -50 mm. A brake spindle head mounting hole 141 is provided on the right side of the flat head 14. The flat head 14 is connected to the brake spindle head 151 in the brake system through an interference fit through the brake spindle head mounting hole 141.

[0024] Figure 5 As shown, the braking system includes a brake shaft 15, a wear-resistant layer 16, a brake hydraulic cylinder 17, a brake disc 18, a bearing 19, a speed sensor 20, a slide 21, a displacement sensor 22, and a guide rail 23. The brake shaft 15 comprises a brake shaft head 151, a brake shaft segment 152, and a brake shaft support segment 153. The brake shaft head 151 is interference-fitted with the flat head 14 via the brake shaft head mounting hole 141. The wear-resistant layer 16 is bolted to the outer surface of the brake shaft segment 152. During braking, the brake disc 18 contacts the wear-resistant layer 16. The brake disc 18 is connected to the brake hydraulic cylinder 17, which regulates the speed and stroke of the brake disc 18. A speed sensor 20 is mounted on the right side of the bearing 19 to measure the speed at the output end of the forward and reverse heavy-duty coupling. The bearing 19 is mounted on the slide 21, which slides relative to the guide rail 23. The slide 21 monitors its sliding distance via a sensor 22 mounted on the guide rail 23.

[0025] Working process and principle:

[0026] Before the test, the position of the forward and reverse heavy-duty coupling is adjusted. First, by controlling the sliding distance between the slide 21 and the guide rail 23, the relative telescopic distance L between the flat head 14 and the fork head 13 is adjusted to a specified value. The relative telescopic value range of L is 200 to -50 mm. Then, by controlling the stroke of the hydraulic cylinder 9, the relative swing angle between the flat head 14 and the fork head 13 is adjusted. θ , swing angle θ The range is plus or minus 5 0 .

[0027] During the test, the heavy-duty coupling, which rotates forward and reverse, is driven by motor 3. When the speed reaches the rated value, brake hydraulic cylinder 17 applies a specified braking force to brake shaft segment 152 to simulate the rolling reaction force from the rolled material during rolling. Then, the direction of motor 3 rotation is reversed. When the speed reaches the rated value, brake hydraulic cylinder 17 applies a specified braking force to brake shaft segment 152.

[0028] Repeat the above steps until the forward and reverse heavy-duty coupling fails structurally. Count the number of rotations before failure of the forward and reverse heavy-duty coupling. This number is the fatigue life of the forward and reverse heavy-duty coupling under the test conditions.

Claims

1. A forward and reverse heavy-duty coupling fatigue life accelerated detection test bench, characterized by: Including drive system, swing angle adjustment system, forward and reverse heavy-duty coupling and braking system; The drive system includes a bearing, a speed sensor, a motor, a bearing, a reduction gear box, and an articulated box. The speed sensor is mounted on the side surface of the bearing. The motor is a forward and reverse motor. The articulated box contains a pin shaft. The swing angle adjustment system includes an articulated joint, a swing angle adjustment head, a hydraulic cylinder, a shaft head, and a torque sensor. The articulated joint contains a pin hole, which is connected to a pin shaft inside the articulated box. The swing angle adjuster is connected to the cylinder, which is fixed to the ground through a revolute pair. The torque sensor is installed on the outer surface of the shaft head. The forward and reverse heavy-duty coupling comprises a fork, a slider, and a flat head. A shaft head mounting hole is provided at the end of the fork, and the fork is connected to the shaft head of the swing angle adjustment system through an interference fit through the shaft head mounting hole. The fork and the slider are clearance-fitted, allowing relative swing between them. The flat head and the slider are clearance-fitted, allowing relative expansion and contraction along the axial direction between them. A brake shaft head mounting hole is provided at the end of the flat head. The braking system includes a brake shaft, a wear-resistant layer, a brake hydraulic cylinder, a brake disc, a torque sensor, a bearing, a speed sensor, a slide, a displacement sensor, and a guide rail; the brake shaft includes a brake shaft head, a brake shaft section, and a brake shaft support section. The brake shaft head and the flat head are connected by an interference fit through the brake shaft head mounting hole. The wear-resistant layer is connected to the outer surface of the brake shaft section by bolts. The brake disc contacts the wear-resistant layer during braking. The brake disc is connected to the brake oil cylinder. A speed sensor is installed on the side surface of the bearing; the bearing is installed on the slide, and the slide and the guide rail can slide relative to each other. The slide monitors the sliding distance of the slide through a sensor installed on the guide rail.

2. The forward and reverse heavy-duty coupling fatigue life accelerated detection test bench according to claim 1 is characterized by: The relative swing angle θ between the fork head and the flat head of the forward and reverse heavy coupling is plus or minus 5 0 .

3. The forward and reverse heavy-duty coupling fatigue life accelerated detection test bench according to claim 1 is characterized by: In the forward and reverse heavy-duty coupling, the relative telescopic distance between the flat head and the fork head is L, and L=200~-50mm.

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