Variable-load rotary bending fatigue test device

Abstract

The utility model discloses a variable-load rotary bending fatigue test device, which comprises a detection table, a fixed clamping part, a movable clamping part and a load part, and is characterized in that the fixed clamping part comprises a first seat body fixed on the detection table and a first hollow shaft mounted in the first seat body, and a first chuck is mounted on the first hollow shaft; the driving motor mounted on the detection table is used for driving the first hollow shaft to rotate; the movable clamping part comprises a second seat body slidably mounted on the detection table through an elastic piece and a second hollow shaft mounted in the second seat body, and a second chuck is mounted on the second hollow shaft; the load part comprises a load motor fixed on the detection table, a driving shaft connected to a main shaft of the load motor and a plane cam fixed on the driving shaft, a load rod is mounted on the lower side of the second seat body, and a rotor at the lower end of the load rod is mounted in a cam groove of the plane cam in a sliding manner; the load rod comprises an upper rod and a lower rod which are connected together through an inner threaded pipe. According to the invention, detection test can be carried out under variable load and fixed load.

Description

Technical Field

[0001] The utility model relates to a variable load rotation bending fatigue testing device. Background Art

[0002] In order to detect the internal quality and fatigue resistance of the workpiece, a rotating bending fatigue test device is generally used to test the rod. During the test, one end of the workpiece is fixed on a fixed chuck, and a set load is applied to the other end of the workpiece, and then the workpiece is rotated. Although the existing test method can meet the conventional test, in the actual use process, the load on the workpiece does not remain fixed, but changes with different use conditions. For such load changes, the existing test equipment cannot be used, which also makes it impossible to simulate the workpiece under such load changes to obtain appropriate test data. Utility Model Content

[0003] In order to solve the problem that the existing test device cannot perform a rotation bending fatigue test under a dynamic load, the present application proposes a variable load rotation bending fatigue test device, which includes a test platform, a fixed clamping part, a dynamic clamping part and a load part, the fixed clamping part and the dynamic clamping part are installed on the test platform at intervals along the first axis direction; the fixed clamping part includes a first seat body fixed on the test platform and a first hollow shaft rotatably installed in the first seat body, and a first chuck is installed at one end of the first hollow shaft facing the dynamic clamping part; a driving motor is fixedly installed on the test platform, and the main shaft of the driving motor is connected to the first hollow shaft, and the driving motor is used to drive the first hollow shaft to rotate;

[0004] The dynamic clamping part includes a second seat body and a second hollow shaft rotatably mounted in the second seat body, a second chuck is mounted on one end of the second hollow shaft facing the fixed clamping part, a slide plate is slidably mounted on the detection table, the slide plate can reciprocate along the first axis direction, and the second seat body is mounted on the slide plate via an elastic member; the central axes of the second hollow shaft and the first hollow shaft both extend along the first axis direction;

[0005] The load-bearing part includes a load motor, a drive shaft and a plane cam. The load motor is fixedly mounted on the detection platform, the drive shaft is connected to the main shaft of the load motor, and the plane cam is fixedly mounted on the drive shaft; a load rod is mounted on the lower side of the second seat body, and the load rod extends downward in a vertical direction. A rotor is rotatably mounted at the lower end of the load rod, and the rotor is slidably mounted in the cam groove of the plane cam. Driven by the load motor, the plane cam can drive the load rod to reciprocate in the vertical direction; the load rod includes an upper rod and a lower rod connected together by an internal threaded tube, and screwing the internal threaded tube can adjust the length of the load rod.

[0006] When the present application is working, first fix the two ends of the workpiece to be tested on the first chuck and the second chuck respectively, then screw the internal threaded tube, adjust the length of the load rod, compress the elastic part, apply the load to the workpiece to be tested, then start the drive motor, perform a rotation bending fatigue test on the workpiece to be tested, start the load motor synchronously, drive the plane cam to rotate, so that the load loaded on the workpiece to be tested changes periodically. If the load motor is not started during the test, the load loaded on the upper end of the workpiece to be tested is a fixed load, and it can be used as a conventional rotation bending fatigue test device.

[0007] Furthermore, to maintain the stability of the driving rod, the load-bearing part also includes a suspension rod extending in a vertical direction, the upper end of the suspension rod is fixedly mounted on the detection platform, and the end of the driving shaft away from the load motor is rotatably mounted on the lower end of the suspension rod.

[0008] Furthermore, in order to facilitate the detection of the load produced by the boom, the rotor is installed at the lower end of the boom via a tension sensor.

[0009] Furthermore, in order to enable the plane cam to move synchronously with the moving clamping part, an external thread is provided on the driving shaft, two positioning nuts are screwed on the external thread of the driving shaft, the plane cam is located between the two positioning nuts, and the two positioning nuts fix the plane cam on the driving shaft. When the moving clamping part is moved, the two positioning nuts need to be loosened so that the plane cam can move synchronously with the moving clamping part. After the moving of the moving clamping part is completed, the two positioning threads are tightened to fix the plane cam on the driving shaft.

[0010] Furthermore, in order to maintain the stability of the dynamic clamping portion, the elastic member is a helical compression spring, and two helical compression springs are provided, and the two helical compression springs are symmetrically arranged relative to the central axis of the second hollow shaft.

[0011] Furthermore, in order to prevent the helical compression spring from tilting and causing the dynamic clamping part to deviate from the set position, a limit rod is provided corresponding to each helical compression spring, one end of which is fixedly mounted on the second seat body or the slide plate, and the other end of the limit rod is a free end; when the limit rod is fixedly mounted on the second seat body and the helical compression spring is in a free state, there is a distance between the free end of the limit rod and the slide plate; when the limit rod is fixedly mounted on the slide plate and the helical compression spring is in a free state, there is a distance between the free end of the limit rod and the second seat body; the helical compression spring is freely mounted on the corresponding limit rod.

[0012] Further, in order to maintain the stability of the dynamic clamping portion, the two helical compression springs are symmetrically arranged relative to the load rod.

[0013] Furthermore, in order to ensure the flexibility of the slide plate, a slide rail extending along the first axis is fixedly installed on the inspection table, the slide plate is slidably installed on the slide rail, a positioning screw is screwed on the slide plate, and the positioning screw can pass through the slide plate and press against the slide rail to fix the slide plate on the slide rail. The positioning screw can be used to fix the slide plate on the inspection table.

[0014] Furthermore, for ease of installation, a slide groove is provided on the test table along the first axis direction, and the lower end of the load rod freely passes through the slide groove downward and is slidably installed in the cam groove of the plane cam through the rotor. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model.

[0016] Figure 2 yes Figure 1 Center AA view. DETAILED DESCRIPTION

[0017] See also Figure 1 and Figure 2 In the accompanying drawings, the extension direction of the first axis X is the first axis direction, and the extension direction of the second axis Y is the second axis direction. The variable load rotation bending fatigue test device is described in detail below.

[0018] The rotary bending fatigue test device comprises a test bench 10, a fixed clamping part 20, a dynamic clamping part 30 and a load part 50. The test bench 10 comprises a workbench 11 and legs 12 supporting the workbench 11.

[0019] The fixed clamping portion 20 includes a first seat body 23 fixed on the worktable, a first axial hole is arranged on the first seat body 23 along the first axial direction, a first hole shoulder 231 is arranged in the first axial hole, the first hollow shaft 21 is rotatably installed in the first axial hole via a pair of first angular contact bearings 22, and the central axis of the first hollow shaft extends along the first axial direction.

[0020] A first shaft shoulder 211 is provided on the first hollow shaft, and the first shaft shoulder 211 divides the first hollow shaft 21 into a first mounting section 213 and a driving section 212. The first shaft shoulder 211 is located on the side of the first hole shoulder away from the dynamic clamping portion, and the first mounting section 213 is rotatably mounted in the first shaft hole through the first angular contact bearing 22, wherein one first angular contact bearing is located between the first hole shoulder and the first shaft shoulder, and the other first angular contact bearing is located on the other side of the first hole shoulder. The first screw 25 mounts the first bearing cover 24 on the side of the first seat body facing the dynamic clamping portion, and retains a pair of first angular contact bearings 22 in the first shaft hole. The first mounting section 213 extends out of the first shaft hole toward the dynamic clamping portion 30, and the first chuck 26 is fixedly mounted on the end of the first mounting section 213. In this embodiment, the first chuck 26 specifically adopts a three-jaw chuck.

[0021] The driving motor 40 is fixedly mounted on the workbench, the driving section 212 is formed as a connecting shaft, and the main shaft of the driving motor 40 is connected to the driving section 212 of the first hollow shaft, and the driving motor is used to drive the first hollow shaft to rotate. An encoder is installed on the main shaft of the driving motor to record the number of rotations of the main shaft, which is the number of rotations of the bolt to be detected.

[0022] The dynamic clamping part 30 includes a second seat body 33, in which a second axial hole is provided along the first axis direction, a second hole shoulder 331 is provided in the second axial hole, and the second hollow shaft 31 is rotatably installed in the second axial hole via a pair of second angular contact bearings 32, and the central axis of the second hollow shaft extends along the first axis direction. A second shaft shoulder 311 is provided on the second hollow shaft, and the second shaft shoulder 311 divides the second hollow shaft 31 into a second mounting section 312 and a second clamping section 313. The second shaft shoulder 311 is located on the side of the second hole shoulder facing the fixed clamping part, and the second mounting section 312 is rotatably installed in the second axial hole via the second angular contact bearing 32, wherein one second angular contact bearing is located between the second hole shoulder and the second shaft shoulder, and the other second angular contact bearing is located on the other side of the second hole shoulder, and the second bearing cover 34 is installed on the side of the second seat body away from the fixed clamping part by a second screw 35, so as to keep the pair of second angular contact bearings 32 in the second axial hole. The second clamping section 313 extends out of the second axial hole toward the fixed clamping portion 20, and the second chuck 36 is fixedly mounted at the end of the second clamping section. In this embodiment, the second chuck 36 is specifically a three-jaw chuck.

[0023] Two slide rails 13 are fixedly mounted on the table panel. The two slide rails 13 extend along the first axis and are parallel to each other. The slide plate 14 is slidably mounted on the two slide rails so that the slide plate can reciprocate along the first axis. A positioning screw hole is provided on the slide plate. The positioning screw hole passes through the slide plate in the vertical direction. A positioning screw 141 is screwed into the positioning screw hole. The positioning screw can pass through the slide plate and press against the slide rail to fix the slide plate on the slide rail.

[0024] Two helical compression springs 37 are installed on the slide in the vertical direction. The two helical compression springs are symmetrically arranged relative to the central axis of the second hollow shaft. The two helical compression springs extend in the vertical direction, and the second seat body 33 is fixedly installed on the upper ends of the two helical compression springs. The two helical compression springs are formed into an elastic member together, that is, the second seat body is installed on the slide via the elastic member.

[0025] Corresponding to each helical compression spring 37, a limiting rod 38 extending in the vertical direction is provided, and the helical compression spring is freely sleeved on the corresponding limiting rod. The lower end of the limiting rod 38 is fixed on the slide plate, and the upper end of the limiting rod is a free end. When the helical compression spring is in a free state, there is a distance between the free end of the limiting rod and the second seat body. It can be understood that in another embodiment, the upper end of the limiting rod can also be fixed on the lower surface of the second seat body, and the lower end of the limiting rod is formed as a free end, so that when the helical compression spring is in a free state, there is a distance between the free end of the limiting rod and the slide plate.

[0026] The load-bearing part 50 includes a load motor 51, a drive shaft 52, a plane cam 54 and a suspension rod 53. The load motor is fixedly mounted on the legs of the test bench. The drive shaft 52 is connected to the main shaft of the load motor. The plane cam 54 is sleeved on the drive shaft. The drive shaft is provided with an external thread. Two positioning nuts 57 are screwed on the external thread of the drive shaft. The plane cam 54 is located between the two positioning nuts 57. The two positioning nuts 57 fix the plane cam on the drive shaft. The suspension rod 53 extends in the vertical direction. The upper end of the suspension rod 53 is fixedly mounted on the lower surface of the workbench 11. The end of the drive shaft 52 away from the load motor is rotatably mounted on the lower end of the suspension rod via a bearing.

[0027] A load rod 60 is installed on the lower side of the second seat body 33. The load rod 60 extends downward in the vertical direction. A rotor 542 is rotatably installed at the lower end of the load rod. The rotor 542 is slidably installed in the cam groove 541 of the plane cam 54. Under the drive of the load motor, the plane cam can drive the load rod to move back and forth in the vertical direction. A tension sensor 56 is installed at the lower end of the suspension rod. A short rod 55 is installed on the lower side of the tension sensor. The rotor is installed at the lower end of the short rod 55, that is, the rotor is installed at the lower end of the suspension rod via a tension sensor. The tension sensor is used to detect the load. In this embodiment, the tension sensor 56 adopts an S-type tension and pressure sensor U10A.

[0028] To facilitate load adjustment, the load rod 60 includes an upper rod 61, a lower rod 62 and an internal threaded tube 63. The upper rod is located on the upper side of the lower rod, and the upper end of the upper rod is fixed on the lower side of the second seat body. The lower end of the upper rod and the upper end of the lower rod are both screwed into the internal threaded tube. Screwing the internal threaded tube can adjust the length of the load rod.

[0029] A slide groove 111 is provided on the table panel along the first axis direction. The lower end of the load rod freely passes through the slide groove downward and is slidably installed in the cam groove of the plane cam through the rotor.

Claims

1. A variable load rotating bending fatigue test device, characterized in that: It comprises a testing platform, a fixed clamping part, a dynamic clamping part and a load part, wherein the fixed clamping part and the dynamic clamping part are installed on the testing platform at intervals along the first axis direction; the fixed clamping part comprises a first seat body fixed on the testing platform and a first hollow shaft rotatably installed in the first seat body, and a first chuck is installed at one end of the first hollow shaft facing the dynamic clamping part; a driving motor is fixedly installed on the testing platform, and the main shaft of the driving motor is connected to the first hollow shaft, and the driving motor is used to drive the first hollow shaft to rotate; The dynamic clamping part includes a second seat body and a second hollow shaft rotatably mounted in the second seat body, a second chuck is mounted on one end of the second hollow shaft facing the fixed clamping part, a slide plate is slidably mounted on the detection table, the slide plate can reciprocate along the first axis direction, and the second seat body is mounted on the slide plate via an elastic member; the central axes of the second hollow shaft and the first hollow shaft both extend along the first axis direction; The load-bearing part includes a load motor, a drive shaft and a plane cam. The load motor is fixedly mounted on the detection platform, the drive shaft is connected to the main shaft of the load motor, and the plane cam is fixedly mounted on the drive shaft; a load rod is mounted on the lower side of the second seat body, and the load rod extends downward in a vertical direction. A rotor is rotatably mounted at the lower end of the load rod, and the rotor is slidably mounted in the cam groove of the plane cam. Driven by the load motor, the plane cam can drive the load rod to reciprocate in the vertical direction; the load rod includes an upper rod and a lower rod connected together by an internal threaded tube, and screwing the internal threaded tube can adjust the length of the load rod.

2. The rotary bending fatigue testing device according to claim 1, characterized in that: The load-bearing part further comprises a suspension rod, which extends in a vertical direction. The upper end of the suspension rod is fixedly mounted on the detection platform, and one end of the driving shaft away from the load motor is rotatably mounted on the lower end of the suspension rod.

3. The rotary bending fatigue testing device according to claim 1, characterized in that: The rotor is installed at the lower end of the suspension rod via a tension sensor.

4. The rotary bending fatigue testing device according to claim 1, characterized in that: An external thread is arranged on the driving shaft, two positioning nuts are screwed on the external thread of the driving shaft, a plane cam is located between the two positioning nuts, and the two positioning nuts fix the plane cam on the driving shaft.

5. The rotary bending fatigue testing device according to claim 1, characterized in that: The elastic member is a helical compression spring, and two helical compression springs are provided. The two helical compression springs are symmetrically arranged relative to the central axis of the second hollow shaft.

6. The rotary bending fatigue testing device according to claim 5, characterized in that: Corresponding to each helical compression spring, a limit rod is provided, one end of the limit rod is fixedly mounted on the second seat body or the slide plate, and the other end of the limit rod is a free end; when the limit rod is fixedly mounted on the second seat body and the helical compression spring is in a free state, there is a distance between the free end of the limit rod and the slide plate; when the limit rod is fixedly mounted on the slide plate and the helical compression spring is in a free state, there is a distance between the free end of the limit rod and the second seat body; the helical compression spring is freely mounted on the corresponding limit rod.

7. The rotary bending fatigue testing device according to claim 5, characterized in that: The two helical compression springs are arranged symmetrically with respect to the load rod.

8. The rotary bending fatigue testing device according to claim 1, characterized in that: A slide rail extending along the first axis is fixedly installed on the detection table, and a slide plate is slidably installed on the slide rail. A positioning screw is screwed on the slide plate, and the positioning screw can pass through the slide plate and press against the slide rail to fix the slide plate on the slide rail.

9. The rotary bending fatigue testing device according to claim 1, characterized in that: A slide groove is provided on the detection table along the first axis direction. The lower end of the load rod freely passes through the slide groove downward and is slidably installed in the cam groove of the plane cam through the rotor.

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