Wheel-rail rolling contact fatigue testing machine

Abstract

The application discloses a wheel-rail rolling contact fatigue testing machine, which comprises a rack assembly, a chain transmission device, spliced guide rails, guide rail limiting and guiding devices and a roller device. The rack assembly comprises a top plate, a bottom plate and a crossbeam, the crossbeam is sleeved on a plurality of guide columns arranged between the top plate and the bottom plate and is controlled to slide up and down through the chain transmission device; the upper end of the spliced guide rails is fixed on the front end surface of the crossbeam, the lower end penetrates through a T-shaped through hole arranged in the bottom plate and is limited and guided through the installation of the guide rail limiting and guiding devices; the roller device comprises loading rollers and loading supports, the loading rollers are installed on the bottom plate through the loading supports and load the spliced guide rails. The wheel-rail rolling contact fatigue testing machine has the advantages of compact structure, large simulated guide rail length range, multiple matched guide rail types, uniform loading, good stability, high accuracy, greatly shortened testing time and reduced testing cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of material rolling contact fatigue experiment, and in particular to a wheel-rail rolling contact fatigue testing machine. BACKGROUND

[0002] With the rapid development of engineering technology, people have higher and higher requirements for the rolling contact fatigue performance of engineering materials. While the bearing capacity is getting larger and the application range is getting wider, the life and cost of the materials are required to meet the expected requirements. The traditional wheel-rail rolling contact fatigue testing machine usually uses two pairs of rolling rings to simulate the real wheel-rail rolling contact. Although it can reflect the rolling contact fatigue characteristics of the material to some extent, it cannot completely simulate the real wheel-rail contact working condition.

[0003] With the development of science and technology, it is urgent to improve and innovate the existing wheel-rail rolling contact fatigue testing machine. By changing the traditional two pairs of rolling rings to the real guide rail and roller contact working condition, the rolling contact fatigue performance of the material can be more accurately reflected. For example, the Chinese patent with publication number CN118533673A discloses a static and dynamic load steel rail wheel-rail contact fatigue damage simulation test method and device. Although it can simulate the working condition of the wheel-rail under different working conditions by setting different parameters and the working condition between the wheel and the rail, it can detect the wear and rolling contact fatigue damage of the steel rail, and provide theoretical and experimental support for exploring the relationship between the wear of the steel rail and the rolling contact fatigue damage of the wheel-rail and the running condition, as well as the steel rail detection and damage judgment in engineering practice. However, the length of the guide rail that can be simulated by the device is limited, and there is a lack of limiting and guiding measures for the guide rail, which also makes it difficult to ensure the stability of the wheel-rail contact during the experiment. SUMMARY

[0004] Based on the technical problems existing in the background technology, the present application provides a wheel-rail rolling contact fatigue testing machine.

[0005] The wheel-rail rolling contact fatigue testing machine provided by the present application comprises a rack assembly, a chain transmission device, a spliced guide rail, a guide rail limiting and guiding device and a roller device. The rack assembly comprises a top plate, a bottom plate and a crossbeam. A plurality of guide columns are arranged between the top plate and the bottom plate. The crossbeam is sleeved on the plurality of guide columns and is controlled to slide up and down by the chain transmission device. The spliced guide rail is vertically arranged and its upper end is fixed to the front end face of the crossbeam. A T-shaped through hole is arranged on the bottom plate. The lower end of the spliced guide rail is arranged in the T-shaped through hole and is limited and guided by the guide rail limiting and guiding device arranged in the T-shaped through hole. The roller device comprises a loading roller and a loading bracket. The loading roller is installed on the bottom plate by the loading bracket and loads the spliced guide rail.

[0006] Preferably, the loading bracket comprises a connecting rod, a right loading shaft, a loading push rod bracket, a left loading shaft, a uniform loading spring, and a loading shaft bracket; the loading shaft bracket is mounted on the bottom plate at the front side of the spliced guide rail; the left loading shaft and the right loading shaft are respectively arranged at the two sides of the spliced guide rail, and the front ends of the left loading shaft and the right loading shaft are both mounted on the loading shaft bracket; the loading rollers are symmetrically arranged on the left loading shaft and the right loading shaft, and the loading rollers are in rolling contact with the spliced guide rail at the two sides; the uniform loading spring is arranged between the left loading shaft and the right loading shaft at the front side of the loading roller; the loading push rod bracket is mounted on the bottom plate at the rear side of the spliced guide rail; the connecting rod is connected with the rear end of the right loading shaft and the right end of the loading push rod bracket; the loading push rod bracket is provided with a square limiting frame and a loading push rod; the rear end of the left loading shaft is arranged in the square limiting frame, and the tail end of the loading push rod is arranged in the mounting hole of the loading push rod bracket, and the head end of the loading push rod is in contact with the left loading shaft.

[0007] Preferably, the loading shaft bracket is provided with a square loading shaft frame hole, the left loading shaft and the right loading shaft are arranged at the two sides of the spliced guide rail, and the front ends of the left loading shaft and the right loading shaft are both arranged in the square loading shaft frame hole; the upper and lower end faces of the front ends of the left loading shaft and the right loading shaft are both provided with two limiting columns, and the two limiting columns are respectively arranged in the front and rear sides of the loading shaft bracket.

[0008] Preferably, the loading roller is provided with six loading rollers, and the loading rollers are arranged on the left loading shaft or the right loading shaft through a roller bracket.

[0009] Preferably, the guide rail limiting and guiding device comprises a main guiding assembly and two side guiding assemblies; the T-shaped through hole is arranged in a T shape by a horizontal guide rail through hole and a vertical guide rail through hole, and the end of the vertical guide rail through hole is connected with the middle of the horizontal guide rail through hole; the spliced guide rail comprises a horizontal guide rail panel and a vertical guide rail panel, and the side end of the vertical guide rail panel is fixedly connected with the middle of the front end face of the horizontal guide rail panel and arranged in a T shape; the spliced guide rail is arranged at the joint of the horizontal guide rail through hole and the vertical guide rail through hole of the T-shaped through hole; the main guiding assembly is arranged in the vertical guide rail through hole and in contact with the rear end face of the spliced guide rail; the two side guiding assemblies are respectively arranged at the two side ends of the horizontal guide rail through hole and in contact with the front end face of the spliced guide rail.

[0010] Preferably, the main guide assembly comprises a main guide wheel device and a main guide wheel handle, the main guide wheel device is composed of a main guide wheel light pole, a main guide fixed nut, a main guide wheel tightening screw, a main guide wheel support and a main guide roller, the main guide wheel support is installed in the sliding groove on the inner wall of the longitudinal guide through hole of the T-shaped through hole on both sides, the main guide roller is installed in the main guide wheel support through a shaft and is in rolling contact with the rear end face of the horizontal guide panel of the T-shaped spliced guide, the main guide fixed nut is fixed in the longitudinal guide through hole of the T-shaped through hole through a nut fixing rod, the main guide wheel tightening screw is threaded and penetrates the main guide fixed nut, and the front end of the main guide wheel tightening screw is installed on the main guide wheel support through a bearing, and the main guide wheel light pole penetrates the bottom plate at the end of the longitudinal guide through hole of the T-shaped through hole and is fixed at the end of the main guide wheel tightening screw.

[0011] Preferably, the side guide assembly comprises a side guide wheel device and a side guide wheel handle, the side guide wheel device is composed of a side guide roller, a side guide roller bearing, a side guide wheel support, a side guide wheel tightening screw, a side guide fixed nut and a side guide wheel light pole, the front end face of the side guide wheel support is installed in the sliding groove on the inner wall of the horizontal guide through hole of the T-shaped through hole, the front end of the inner core shaft of the side guide roller bearing is installed on the rear end face of the side guide wheel support, the outer shaft sleeve of the side guide roller bearing is in rolling contact with the longitudinal guide panel of the T-shaped spliced guide, the side guide roller is installed on the rear end of the inner core shaft of the side guide roller bearing and is in rolling contact with the front end face of the horizontal guide panel of the T-shaped spliced guide, the side guide fixed nut is fixed on the inner wall of the horizontal guide through hole of the T-shaped through hole through a nut fixing rod, the side guide wheel tightening screw is threaded and penetrates the side guide fixed nut, and the front end of the side guide wheel tightening screw is installed on the side guide wheel support through a bearing, and the side guide wheel light pole penetrates the bottom plate at the side end of the horizontal guide through hole of the T-shaped through hole and is fixed at the tail end of the side guide wheel tightening screw.

[0012] Preferably, the guide column is provided with at least two sets, each set of guide column is composed of at least one main guide column and one auxiliary guide column, the main guide column and the auxiliary guide column are parallel to each other, the beam is provided with a plurality of guide column mounting holes, the number and position of the main guide column and the auxiliary guide column correspond to the guide column mounting holes and are installed in the guide column mounting holes.

[0013] The upper and lower ends of the chain are fixed with the upper and lower ends of the chain to form a circle, and the lower end of the chain is fixed with the upper and lower ends of the chain to form a circle.

[0014] Preferably, the spliced ​​guide rail consists of a guide rail base and two L-shaped guide rails, the two L-shaped guide rails are formed by two symmetrical L-shaped channel steels formed by cutting a U-shaped channel steel in half, and the two L-shaped guide rails are symmetrically arranged on both sides of the guide rail base and fixedly spliced ​​with the guide rail base to form a T-shaped structure; the transverse guide rail panel consists of the transverse panels of the two L-shaped guide rails and the guide rail base part sandwiched between the two L-shaped guide rails, and the longitudinal guide rail panel consists of the longitudinal panels of the two L-shaped guide rails and the guide rail base part.

[0015] The beneficial effects of the present invention are:

[0016] (1) A wheel-rail rolling contact fatigue testing machine of the present invention controls the spliced ​​guide rail to perform vertical reciprocating motion between the top plate and the bottom plate through a chain transmission device, and has the advantages of long transmission distance, large transmission torque, and adjustable transmission distance. By increasing the distance between the top plate and the bottom plate, the length of the spliced ​​guide rail can be increased, so that a larger range of guide rail lengths can be simulated.

[0017] (2) A wheel-rail rolling contact fatigue testing machine of the present invention has a loading bracket and a loading roller installed on a bottom plate, and a plurality of loading rollers are used to uniformly load the spliced ​​guide rails from both sides of the spliced ​​guide rails, so as to simulate the load of the wheel-rail contact interface, ensure that the guide rails on both sides are loaded evenly, and improve the accuracy of the wheel-rail rolling contact fatigue test; at the same time, the plurality of loading rollers form contact with the surface of the spliced ​​guide rails, which can greatly shorten the test time of the wheel-rail rolling contact fatigue test.

[0018] (3) The wheel-rail rolling contact fatigue testing machine of the present invention can limit and guide the spliced ​​guide rails from multiple directions by arranging T-shaped through holes on the bottom plate and installing guide rail limit guide devices, thereby ensuring the stability of the spliced ​​guide rails during the test and improving the test accuracy; at the same time, it can adapt to many types of test guide rails and has good use value and application prospects.

[0019] (4) The wheel-rail rolling contact fatigue testing machine has compact structure, can simulate a larger length range of guide rails, is suitable for multiple types of guide rails, is uniformly loaded, has good stability, high accuracy, greatly shortens testing time and reduces testing cost. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 : The structural schematic diagram (front) of the present application;

[0021] Figure 2 : The structural schematic diagram (back) of the present application;

[0022] Figure 3 : The structural schematic diagram of the roller device of the present application;

[0023] Figure 4 : The installation structural schematic diagram of the guide rail limiting and guiding device of the present application;

[0024] Figure 5 : The structural explosion diagram of the main guiding assembly of the present application;

[0025] Figure 6 : The structural explosion diagram of the side guiding assembly of the present application;

[0026] Figure 7 : The contact partial enlarged view of the guide rail limiting and guiding device and the spliced guide rail of the present application.

[0027] Wherein: 1, top plate; 2, auxiliary guiding column; 3, main guiding column; 4, upper fixed chain wheel support; 5, chain; 6, cross beam; 7, connecting rod; 8, right loading shaft; 9, lower fixed chain wheel; 10, lower fixed chain wheel support; 11, shaft coupling; 12, servo motor; 13, motor support; 14, main guiding wheel handle; 15, bottom plate; 16, side guiding wheel device; 161, side guiding roller; 162, side guiding roller bearing; 163, side guiding wheel support; 164, side guiding wheel tightening screw; 165, side guiding fixed nut; 166, side guiding wheel light pole; 17, side guiding wheel handle; 18, main guiding wheel device; 181, main guiding wheel light pole; 182, main guiding fixed nut; 183, main guiding wheel tightening screw; 184, main guiding wheel support; 185, main guiding roller; 19, lower end chain fixer; 20, loading push rod support; 21, loading roller; 22, left loading shaft; 23, loading push rod; 24, spliced guide rail; 25, lower movable chain wheel; 26, upper movable chain wheel; 27, upper fixed chain wheel; 28, upper end chain fixer; 29, uniform loading hanging spring; 30, loading shaft support. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Example

[0029] Reference Figures 1-7 The present invention proposes a wheel-rail rolling contact fatigue testing machine, which includes a frame assembly, a chain transmission device, a spliced ​​guide rail 24, a guide rail limiting guide device and a roller device.

[0030] The frame assembly includes a top plate 1, a bottom plate 15, and a crossbeam 6. Several guide posts are provided between the top plate 1 and the bottom plate 15. The crossbeam 6 is mounted on the guide posts and is controlled to slide up and down on the guide posts by a chain transmission device. The splicing guide rail 24 is vertically arranged and its upper end is fixed to the front end face of the crossbeam 6. The bottom plate 15 is provided with a T-shaped through hole, and the lower end of the splicing guide rail 24 is inserted into the T-shaped through hole. The chain transmission device can control the splicing guide rail 24 to perform vertical reciprocating motion between the top plate 1 and the bottom plate 15, which has the advantages of long transmission distance, large transmission torque, and adjustable transmission distance. By increasing the distance between the top plate 1 and the bottom plate 15, the length of the splicing guide rail 24 can be increased, so that a larger range of guide rail lengths can be simulated.

[0031] A guide rail limiting guide device is installed in the T-shaped through hole set on the base plate 15 and realizes rolling contact with the spliced ​​guide rail 24. Through the adjustment of the guide rail limiting guide device, the spliced ​​guide rail 24 can be limited and guided from multiple directions, thereby ensuring the movement stability of the spliced ​​guide rail 24 during the test and improving the test accuracy. At the same time, it can adapt to many types of test guide rails and has good use value and application prospects.

[0032] The roller assembly includes a loading roller 21 and a loading bracket. The loading roller 21 is mounted on the base plate 15 via the loading bracket and loads the spliced ​​guide rail 24. Multiple loading rollers 21 uniformly load the spliced ​​guide rail 24 from both sides, simulating the load at the wheel-rail contact interface. This ensures uniform loading on both rails and improves the accuracy of the wheel-rail rolling contact fatigue test. Furthermore, the contact between the multiple loading rollers 21 and the surface of the spliced ​​guide rail 24 significantly shortens the test time.

[0033] The wheel-rail rolling contact fatigue testing machine of the present invention has a compact structure, can simulate a wide range of guide rail lengths, is adaptable to multiple guide rail types, has uniform load bearing, good stability, and high accuracy, while greatly shortening the test time and reducing the test cost. Example

[0034] Reference Figures 1-7The present invention proposes a wheel-rail rolling contact fatigue testing machine, which includes a frame assembly, a chain transmission device, a spliced ​​guide rail 24, a guide rail limiting guide device and a roller device.

[0035] The frame assembly includes a top plate 1, a bottom plate 15, and a crossbeam 6. Several guide columns are arranged between the top plate 1 and the bottom plate 15. There are at least two sets of guide columns, and each set of guide columns consists of at least one main guide column 3 and one auxiliary guide column 2. The main guide column 3 and the auxiliary guide column 2 are parallel to each other. Several guide column mounting holes are provided on the crossbeam 6. The number and position of the main guide columns 3 and the auxiliary guide columns 2 correspond one-to-one to the guide column mounting holes and are installed in the guide column mounting holes accordingly. The crossbeam 6 is mounted on several guide columns and is controlled by a chain transmission device to slide up and down on the guide columns. The splicing guide rail 24 is vertically arranged and its upper end is fixed to the front end face of the crossbeam 6. A T-shaped through hole is provided on the bottom plate 15, and the lower end of the splicing guide rail 24 is arranged to penetrate through the T-shaped through hole.

[0036] The chain transmission device includes a chain 5, a lower fixed sprocket 9, a lower end chain fixer 19, a lower movable sprocket 25, an upper movable sprocket 26, an upper fixed sprocket 27, and an upper end chain fixer 28. The lower fixed sprocket 9 is installed on the output shaft of the servo motor 12 through the lower fixed sprocket bracket 10 and the coupling 11, and the servo motor 12 is installed on the upper end surface of the base plate 15 on the rear side of the beam 6 through the motor bracket 13; the lower end chain fixer 19 is installed on the upper end surface of the base plate 15 on one side of the lower fixed sprocket 9, the lower movable sprocket 25 and the upper movable sprocket 26 are installed on the upper and lower sides of the rear end surface of the beam 6, the upper fixed sprocket 27 is installed on the lower end surface of the top plate 1 on the rear side of the beam 6 through the upper fixed sprocket bracket 4, and the upper end chain fixer 28 is installed on the lower end surface of the top plate 1 on one side of the upper fixed sprocket 27; the chain 5 is installed on the upper movable sprocket 26, the upper fixed sprocket 27, the lower fixed sprocket 9 and the lower movable sprocket 25 in sequence, and its upper end is fixedly mounted on the upper end chain fixer 28, and its lower end is fixedly mounted on the lower end chain fixer 19.

[0037] like Figure 1 、 2As shown, when the servo motor 12 mounted on the motor bracket 13 is started to rotate forward, the chain 5 pulls the crossbeam 6 to slide downward on the guide column; when the servo motor 12 mounted on the motor bracket 13 is started to reverse, the chain 5 pulls the crossbeam 6 to slide upward on the guide column, thereby driving the spliced ​​guide rail 24 mounted on the crossbeam 6 to perform upward and downward lifting movements. When the servo motor 12 mounted on the motor bracket 13 is started to rotate forward and reverse periodically, it can drive the lower fixed sprocket 9 to perform periodic forward and reverse rotation, and then drive the crossbeam 6 through the chain 5 to achieve up and down reciprocating linear motion, and finally drive the spliced ​​guide rail 24 mounted on the crossbeam 6 to achieve up and down reciprocating linear motion, thereby simulating real wheel-rail rolling contact. The chain transmission device can control the spliced ​​guide rail 24 to perform vertical reciprocating motion between the top plate 1 and the bottom plate 15, which has the advantages of long transmission distance, large transmission torque, and adjustable transmission distance. By increasing the distance between the top plate 1 and the bottom plate 15 , the length of the spliced ​​guide rail 24 can be increased, so that a larger range of guide rail lengths can be simulated.

[0038] like Figure 3 、 Figure 4 、 Figure 7 As shown, the splicing guide rail 24 includes a transverse guide rail panel and a longitudinal guide rail panel, and the side end of the longitudinal guide rail panel is fixedly connected to the middle of the front end surface of the transverse guide rail panel and arranged in a T-shaped structure. The splicing guide rail 24 is arranged at the intersection of the transverse guide rail through hole and the longitudinal guide rail through hole of the T-shaped through hole. As for the splicing guide rail 24, it is specifically made of a guide rail base plate and two L-shaped guide rails. The two L-shaped guide rails are formed by two symmetrical L-shaped channel steels formed by cutting a U-shaped channel steel in half. The two L-shaped guide rails are symmetrically arranged on both sides of the guide rail base plate and fixedly spliced ​​with the guide rail base plate to form a T-shaped structure. The transverse guide rail panel is composed of the transverse panels of the two L-shaped guide rails and the guide rail base plate portion sandwiched between the two L-shaped guide rails. The longitudinal guide rail panel is composed of the longitudinal panels of the two L-shaped guide rails and the guide rail base plate portion.

[0039] A guide rail limiting guide device is installed in the T-shaped through hole provided on the bottom plate 15 and realizes rolling contact with the splicing guide rail 24 .

[0040] like Figures 4-7 As shown, the guide rail limit guide device includes a main guide assembly and two side guide assemblies. The T-shaped through-hole is composed of a transverse guide rail through-hole and a longitudinal guide rail through-hole arranged in a T-shape, with the end of the longitudinal guide rail through-hole connecting to the middle of the transverse guide rail through-hole. The main guide assembly is installed in the longitudinal guide rail through-hole and contacts the rear end of the splicing guide rail 24. The two side guide assemblies are respectively installed at the two side ends of the transverse guide rail through-hole and both contact the front end of the splicing guide rail 24.

[0041] like Figure 4 、Figure 5 、 Figure 7 As shown, the main guide assembly includes a main guide wheel device 18 and a main guide wheel handle 14. The main guide wheel device 18 consists of a main guide wheel polished rod 181, a main guide fixing nut 182, a main guide wheel tightening screw 183, a main guide wheel bracket 184, and a main guide roller 185. Both sides of the main guide wheel bracket 184 are mounted in the slide grooves provided on the inner wall of the longitudinal guide rail through-hole of the T-shaped through-hole. The main guide roller 185 is mounted in the main guide wheel bracket 184 via a shaft and is in rolling contact with the rear end surface of the transverse guide rail panel of the T-shaped spliced ​​guide rail 24 (i.e., the rear end surface of the guide rail base plate sandwiched between the two L-shaped guide rails). The main guide fixing nut 182 is fixed in the longitudinal guide rail through-hole of the T-shaped through-hole via a nut fixing rod. The main guide wheel tightening screw 183 is threadedly provided in the main guide fixing nut 182, and the front end of the main guide wheel tightening screw 183 is mounted on the main guide wheel bracket 184 via a bearing. The main guide wheel polished rod 181 is provided in the bottom plate 15 at the end of the longitudinal guide rail through-hole of the T-shaped through-hole, and its front end is fixed to the end of the main guide wheel tightening screw 183. By manually rotating the main guide wheel polished rod 181, the main guide wheel tightening screw 183 is driven to rotate in the main guide fixing nut 182, thereby achieving the forward or backward rotation of the main guide wheel tightening screw 183, thereby driving the main guide roller 185 and the main guide wheel bracket 184 to slide in the longitudinal guide rail through-hole of the T-shaped through-hole, thereby adjusting the rolling extrusion force between the main guide roller 185 and the rear end surface of the splicing guide rail 24.

[0042] like Figure 4 、 Figure 6 、 Figure 7As shown, the side guide assembly includes a side guide wheel assembly 16 and a side guide wheel handle 17. The side guide wheel assembly 16 consists of a side guide roller 161, a side guide roller bearing 162, a side guide wheel bracket 163, a side guide wheel tightening screw 164, a side guide fixing nut 165, and a side guide wheel polished rod 166. The front end of the side guide wheel bracket 163 is mounted in a groove provided on the inner wall of the transverse guide rail through-hole of the T-shaped through-hole. The front end of the inner core shaft of the side guide roller bearing 162 is mounted on the rear end of the side guide wheel bracket 163. The outer shaft sleeve of the side guide roller bearing 162 is in rolling contact with the longitudinal guide rail panel of the T-shaped spliced ​​guide rail 24 (i.e., the inner end surface of the longitudinal panel of the L-shaped guide rail). Side guide rollers 161 are mounted on the rear end of the inner core shaft of side guide roller bearings 162 and are in rolling contact with the front end surface of the transverse guide rail panel of the T-shaped spliced ​​guide rail 24 (i.e., the front end surface of the transverse guide rail panel of the longitudinal guide rail panel). Side guide fixing nuts 165 are secured to the inner wall of the transverse guide rail through-hole of the T-shaped through-hole via nut fixing rods. Side guide wheel tightening screws 164 are threadedly inserted through side guide fixing nut 165, and the leading end of side guide wheel tightening screws 164 are mounted on side guide wheel brackets 163 via bearings. Side guide wheel polished rods 166 are inserted through the base plate 15 at the side end of the transverse guide rail through-hole of the T-shaped through-hole, and their leading ends are secured to the trailing end of side guide wheel tightening screws 164. By manually rotating the side guide wheel rod 166, the side guide wheel tightening screw 164 is driven to rotate in the side guide fixing nut 165, thereby realizing the forward or backward rotation of the side guide wheel tightening screw 164, and thereby driving the side guide wheel bracket 163, the side guide roller 161 and the side guide roller bearing 162 to slide in the transverse guide rail through hole of the T-shaped through hole, so as to adjust the rolling extrusion force between the side guide roller bearing 162 and the longitudinal guide rail panel of the spliced ​​guide rail 24 (that is, the inner end face of the longitudinal panel of the L-shaped guide rail of the longitudinal guide rail panel).

[0043] A set of main guide assemblies and two sets of side guide assemblies are installed in the T-shaped through-holes provided on the base plate 15 and achieve rolling contact with the spliced ​​guide rail 24. Through the adjustment of the main guide assemblies and the side guide assemblies, the spliced ​​guide rail 24 can be limited and guided in multiple directions to ensure that the spliced ​​guide rail 24 does not move laterally. At this time, the front-to-back and lateral degrees of freedom of the spliced ​​guide rail 24 are restricted, ensuring that the spliced ​​guide rail 24 can only move up and down under the drive of the crossbeam 6, thereby ensuring the movement stability of the spliced ​​guide rail 24 during the test and improving the test accuracy. At the same time, it can adapt to many types of test guide rails, with good use value and application prospects.

[0044] like Figure 3As shown, the roller device includes a loading roller 21 and a loading bracket. The loading roller 21 is mounted on the base plate 15 through the loading bracket and loads the splicing guide rail 24. The loading bracket includes a connecting rod 7, a right loading shaft 8, a loading push rod bracket 20, a left loading shaft 22, a load-balancing hanging spring 29, and a loading shaft bracket 30.

[0045] The loading shaft bracket 30 is mounted on the bottom plate 15 on the front side of the splicing guide rail 24, and the front ends of the left loading shaft 22 and the right loading shaft 8 are both mounted on the loading shaft bracket 30. Specifically, a square loading shaft frame hole is provided on the loading shaft bracket 30, and the left loading shaft 22 and the right loading shaft 8 are respectively provided on both sides of the splicing guide rail 24, and their front ends are both penetrated and engaged in the square loading shaft frame hole; two limiting posts (not shown in the drawings) are provided on the upper and lower end surfaces of the front ends of the left loading shaft 22 and the right loading shaft 8, and the two limiting posts are respectively engaged in the front and rear sides of the loading shaft bracket 30. Therefore, the left loading shaft 22 and the right loading shaft 8 can move relative to each other in the horizontal direction within the square loading shaft frame hole of the loading shaft bracket 30, but in the longitudinal direction, due to the presence of the limiting posts engaged in the front and rear sides of the loading shaft bracket 30, the left loading shaft 22 and the right loading shaft 8 and the loading shaft bracket 30 will not produce a large displacement in the longitudinal direction.

[0046] Six loading rollers 21 are provided and symmetrically mounted on the left loading shaft 22 and the right loading shaft 8 via roller brackets. The six loading rollers 21 respectively achieve rolling contact with the splicing guide rail 24 from both sides. A load-balancing spring 29 is installed between the left loading shaft 22 and the right loading shaft 8 in front of the loading rollers 21. The loading push rod bracket 20 is mounted on the base plate 15 behind the splicing guide rail 24. The two ends of the connecting rod 7 are axially connected to the rear end of the right loading shaft 8 and the right end of the loading push rod bracket 20, respectively. A square limiting frame is provided within the loading push rod bracket 20 and a loading push rod 23 is installed. The rear end of the left loading shaft 22 extends through the square limiting frame. The tail end of the loading push rod 23 is axially mounted in the mounting hole of the loading push rod bracket 20, and its head end is in contact with the left loading shaft 22. The activation of the loading push rod 23 pushes the left loading shaft 22 to rotate with its front end as the center; while the left loading shaft 22 rotates, the right loading shaft 8 is also rotated with its front end as the center due to the connecting action of the load-balancing spring 29. The synchronous rotation of the left loading shaft 22 and the right loading shaft 8 achieves uniform force on the multiple loading rollers 21 and the splicing guide rail 24.

[0047] By starting the loading push rod 23, due to the fixed end of the loading push rod 23 being fixedly connected to the loading push rod support 20, one end of the loading push rod support 20 is installed in the mounting shaft of the right loading shaft 8 through the connecting rod 7, and the movable end of the loading push rod 23 abuts against the left loading shaft 22 to load until the required wheel rail contact load is reached, and due to the presence of the uniform load hanging spring 29, the uniformity of the load applied to each of the three loading rollers 21 on the left and right sides can be ensured, and the phenomenon of unbalanced load is avoided. One end of the left loading shaft 22 and the right loading shaft 8 on which the uniform load hanging spring 29 is installed is installed on the loading shaft support 30, which ensures that the uniform load hanging spring 29 can only move in the horizontal direction, and limits its freedom of movement up and down. By the loading push rod 23 driving a plurality of loading rollers 21 to uniformly load the spliced guide rail 24 from both sides of the spliced guide rail 24, the load of the simulated wheel rail contact interface is realized, the load of the two guide rails is ensured to be uniform, and the accuracy of the wheel rail rolling contact fatigue test is improved. At the same time, by forming contact between the plurality of loading rollers 21 and the surface of the spliced guide rail 24, the test time of the wheel rail rolling contact fatigue test can be greatly shortened.

[0048] The wheel rail rolling contact fatigue test machine of the present application has a compact structure, can simulate a larger range of guide rail lengths, is suitable for multiple types of guide rails, is uniformly loaded, has good stability, high accuracy, and greatly shortens the test time and reduces the test cost.

[0049] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can make equivalent replacements or changes to the technical solutions and inventive concepts of the present application within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A wheel-rail rolling contact fatigue testing machine, characterized in that: The invention comprises a frame assembly, a chain transmission device, a splicing guide rail (24), a guide rail limiting guide device and a roller device, wherein the frame assembly comprises a top plate (1), a bottom plate (15) and a crossbeam (6), wherein a plurality of guide posts are arranged between the top plate (1) and the bottom plate (15), and the crossbeam (6) is sleeved on the plurality of guide posts and is controlled to slide up and down by the chain transmission device; the splicing guide rail (24) is arranged vertically and its upper end is fixed to the front end surface of the crossbeam (6), and a T-shaped through hole is arranged on the bottom plate (15), and the lower end of the splicing guide rail (24) is arranged through the T-shaped through hole and is limited and guided by the guide rail limiting guide device installed in the T-shaped through hole; the roller device comprises a loading roller (21) and a loading bracket, and the loading roller (21) is installed on the bottom plate (15) through the loading bracket and loads the splicing guide rail (24); The guide rail limiting guide device comprises a set of main guide components and two sets of side guide components, the T-shaped through hole is composed of a transverse guide rail through hole and a longitudinal guide rail through hole arranged in a T shape, and the end of the longitudinal guide rail through hole is connected to the middle of the transverse guide rail through hole; the splicing guide rail (24) comprises a transverse guide rail panel and a longitudinal guide rail panel, and the side end of the longitudinal guide rail panel is fixedly connected to the middle of the front end surface of the transverse guide rail panel and arranged in a T-shaped structure, and the splicing guide rail (24) is arranged at the intersection of the transverse guide rail through hole and the longitudinal guide rail through hole of the T-shaped through hole; the main guide component is arranged in the longitudinal guide rail through hole and contacts the rear end surface of the splicing guide rail (24), and the two sets of side guide components are respectively arranged at the two side ends in the transverse guide rail through hole and both contact the front end surface of the splicing guide rail (24); The spliced ​​guide rail (24) is composed of a guide rail base plate and two L-shaped guide rails, wherein the two L-shaped guide rails are formed by cutting a U-shaped channel steel into two symmetrical L-shaped channel steels, and the two L-shaped guide rails are symmetrically arranged on both sides of the guide rail base plate and fixedly spliced ​​with the guide rail base plate to form a T-shaped structure; the transverse guide rail panel is composed of the transverse panels of the two L-shaped guide rails and the guide rail base plate portion sandwiched between the two L-shaped guide rails, and the longitudinal guide rail panel is composed of the longitudinal panels of the two L-shaped guide rails and the guide rail base plate portion.

2. The wheel-rail rolling contact fatigue testing machine according to claim 1, characterized in that: The loading bracket comprises a connecting rod (7), a right loading shaft (8), a loading push rod bracket (20), a left loading shaft (22), a load-balancing hanging spring (29), and a loading shaft bracket (30); the loading shaft bracket (30) is mounted on a bottom plate (15) on the front side of the splicing guide rail (24); the left loading shaft (22) and the right loading shaft (8) are respectively arranged on both sides of the splicing guide rail (24) and their front ends are both mounted on the loading shaft bracket (30); a plurality of loading rollers (21) are provided and symmetrically mounted on the left loading shaft (22) and the right loading shaft (8); the plurality of loading rollers (21) respectively achieve rolling contact with the splicing guide rail (24) from both sides, and the load-balancing hanging spring (29) is mounted on the loading shaft bracket (30). The loading spring (29) is installed between the left loading shaft (22) and the right loading shaft (8) on the front side of the loading roller (21); the loading push rod bracket (20) is installed on the bottom plate (15) on the rear side of the splicing guide rail (24), and the two ends of the connecting rod (7) are respectively connected to the rear end of the right loading shaft (8) and the right end of the loading push rod bracket (20) by axis; a square limiting frame is provided in the loading push rod bracket (20) and a loading push rod (23) is installed thereon, the rear end of the left loading shaft (22) is penetrated through the square limiting frame, and the tail axis of the loading push rod (23) is installed in the mounting hole of the loading push rod bracket (20), and its head end is in contact with the left loading shaft (22).

3. The wheel-rail rolling contact fatigue testing machine according to claim 2, characterized in that: A square loading shaft frame hole is provided on the loading shaft bracket (30), and the left loading shaft (22) and the right loading shaft (8) are respectively provided on both sides of the splicing guide rail (24), and their front ends are penetrated and engaged in the square loading shaft frame hole; two limit columns are provided on the upper and lower end surfaces of the front ends of the left loading shaft (22) and the right loading shaft (8), and the two limit columns are respectively engaged in the front and rear sides of the loading shaft bracket (30).

4. The wheel-rail rolling contact fatigue testing machine according to claim 2, characterized in that: Six loading rollers (21) are provided and are all mounted on the left loading shaft (22) or the right loading shaft (8) via roller brackets.

5. The wheel-rail rolling contact fatigue testing machine according to claim 1, characterized in that: The main guide assembly comprises a main guide wheel device (18) and a main guide wheel handle (14), wherein the main guide wheel device (18) comprises a main guide wheel light rod (181), a main guide fixing nut (182), a main guide wheel tightening screw (183), a main guide wheel bracket (184) and a main guide roller (185); both sides of the main guide wheel bracket (184) are mounted in a slide groove provided on the inner wall of the longitudinal guide rail through hole of the T-shaped through hole, and the main guide roller (185) is mounted in the main guide wheel bracket (184) through a shaft and is connected to the transverse side of the T-shaped splicing guide rail (24). The rear end surface of the guide rail panel is in rolling contact; the main guide fixing nut (182) is fixed in the longitudinal guide rail through hole of the T-shaped through hole through a nut fixing rod, the main guide wheel tightening screw (183) is set through the main guide fixing nut (182) through a threaded connection, and the front end of the main guide wheel tightening screw (183) is installed on the main guide wheel bracket (184) through a bearing, and the main guide wheel light rod (181) is set through the bottom plate (15) at the end of the longitudinal guide rail through hole of the T-shaped through hole and its front end is fixed to the end of the main guide wheel tightening screw (183).

6. The wheel-rail rolling contact fatigue testing machine according to claim 1, characterized in that: The side guide assembly comprises a side guide wheel device (16) and a side guide wheel handle (17), wherein the side guide wheel device (16) comprises a side guide roller (161), a side guide roller bearing (162), a side guide wheel bracket (163), a side guide wheel tightening screw (164), a side guide fixing nut (165) and a side guide wheel polished rod (166); the front end face of the side guide wheel bracket (163) is mounted in a slide groove provided on the inner wall of the transverse guide rail through hole of the T-shaped through hole, the front end portion of the inner core shaft of the side guide roller bearing (162) is mounted on the rear end face of the side guide wheel bracket (163), the outer shaft sleeve of the side guide roller bearing (162) is in rolling contact with the longitudinal guide rail panel of the T-shaped splicing guide rail (24), and the side guide wheel bracket (163) is in rolling contact with the longitudinal guide rail panel of the T-shaped splicing guide rail (24). The side guide roller (161) is mounted on the rear end of the inner core shaft of the side guide roller bearing (162) and is in rolling contact with the front end surface of the transverse guide rail panel of the T-shaped splicing guide rail (24); the side guide fixing nut (165) is fixed to the inner wall of the transverse guide rail through-hole of the T-shaped through-hole through a nut fixing rod, the side guide wheel tightening screw (164) is threadedly connected and penetrated in the side guide fixing nut (165), and the head end of the side guide wheel tightening screw (164) is mounted on the side guide wheel bracket (163) through a bearing, and the side guide wheel polished rod (166) is penetrated and set in the bottom plate (15) at the side end of the transverse guide rail through-hole of the T-shaped through-hole and its front end is fixed to the tail end of the side guide wheel tightening screw (164).

7. The wheel-rail rolling contact fatigue testing machine according to claim 1, characterized in that: The guide columns are provided with at least two sets, and each set of guide columns is composed of at least one main guide column (3) and one auxiliary guide column (2), and the main guide column (3) and the auxiliary guide column (2) are parallel to each other; a plurality of guide column mounting holes are provided on the crossbeam (6), and the number and position of the main guide columns (3) and the auxiliary guide columns (2) correspond to the guide column mounting holes one by one and are installed in the guide column mounting holes accordingly.

8. The wheel-rail rolling contact fatigue testing machine according to claim 1, characterized in that: The chain transmission device comprises a chain (5), a lower fixed sprocket (9), a lower end chain fixer (19), a lower movable sprocket (25), an upper movable sprocket (26), an upper fixed sprocket (27), and an upper end chain fixer (28); the lower fixed sprocket (9) is mounted on the output shaft of a servo motor (12) through a lower fixed sprocket bracket (10) and a coupling (11); the servo motor (12) is mounted on the upper end surface of a bottom plate (15) on the rear side of a crossbeam (6) through a motor bracket (13); the lower end chain fixer (19) is mounted on the upper end surface of the bottom plate (15) on one side of the lower fixed sprocket (9); the lower The movable sprocket (25) and the upper movable sprocket (26) are mounted on the upper and lower sides of the rear end surface of the crossbeam (6); the upper fixed sprocket (27) is mounted on the lower end surface of the top plate (1) on the rear side of the crossbeam (6) through the upper fixed sprocket bracket (4); the upper end chain holder (28) is mounted on the lower end surface of the top plate (1) on one side of the upper fixed sprocket (27); the chain (5) is sequentially mounted on the upper movable sprocket (26), the upper fixed sprocket (27), the lower fixed sprocket (9) and the lower movable sprocket (25), and the upper end thereof is fixedly mounted on the upper end chain holder (28), and the lower end thereof is fixedly mounted on the lower end chain holder (19).

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