Fatigue testing machine for detecting elevator reset spring

Abstract

The utility model relates to a fatigue testing machine used for detecting an elevator reset spring, the fatigue testing machine comprises a rack, a top plate, a bottom plate, a driving assembly and a clamping assembly used for clamping the spring, the bottom plate is slidably connected to the rack in the vertical direction, the top plate is located above the bottom plate, the top plate is arranged on the rack, the driving assembly is used for driving the bottom plate to reciprocate towards the top plate, and the clamping assembly is used for clamping the spring. The clamping assembly comprises a plurality of clamping plates, a plurality of matching rods and a rotating disc, the rotating disc is rotationally connected to the bottom plate, a plane spiral groove is formed in the rotating disc, the matching rods are circumferentially distributed along the axis of the rotating disc, the matching rods are slidably connected into the plane spiral groove, and the clamping plates correspond to the matching rods one to one; the clamping plate is arranged on the matching rod and connected to the bottom plate in a sliding mode in the radial direction of the rotating disc. The spring fatigue testing device has the advantages that the limiting effect of equipment on the spring is improved, and the accuracy of spring fatigue testing is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of fatigue testing machine, and particularly to a kind of fatigue testing machine for detecting elevator return spring. BACKGROUND

[0002] Elevator return spring is an important component of elevator buffer, and its stability and reliability are directly related to the smooth running of elevator, and fatigue test is the process of evaluating the performance degradation of return spring under cyclic loading until fracture, which is crucial to ensure the durability and safety of return spring.

[0003] At present, the Chinese utility model patent with publication number CN203772537U discloses a spring fatigue testing machine, which comprises a cylinder, a piston rod, a lower bottom plate, an upper pressing plate and a supporting plate. The cylinder is arranged on the supporting plate, and the piston rod of the cylinder is fixedly connected with the upper bottom plate. The upper bottom plate and the lower bottom plate are arranged in parallel, and the lower bottom plate is provided with a groove for placing the spring on the side close to the upper bottom plate. When the spring needs to be tested for fatigue, the upper bottom plate is moved downward to the lower bottom plate under the action of the cylinder, and the upper bottom plate abuts against the spring in the groove of the lower bottom plate until the spring is compressed once. Then, the upper bottom plate is lifted by the cylinder, and the process is repeated for several times to complete the fatigue test of the spring.

[0004] The part of the spring located in the groove lacks circumferential limiting, and the elastic potential energy of the spring may cause the spring to shake and slip during the return process, resulting in errors of the spring fatigue testing machine. UTILITY MODEL CONTENT

[0005] In order to increase the limiting effect of the equipment on the spring and improve the accuracy of the spring fatigue test, the present application provides a kind of fatigue testing machine for detecting elevator return spring.

[0006] The fatigue testing machine for detecting elevator return spring provided by the present application adopts the following technical scheme:

[0007] A kind of fatigue testing machine for detecting elevator return spring, including frame, top plate, bottom plate, drive component and the clamping component for the purpose of clamping spring, the bottom plate is slidably connected on the frame along vertical direction, the top plate is located above bottom plate, the top plate is arranged on the frame, the drive component is used to drive the bottom plate reciprocating movement towards top plate direction, the clamping component includes several clamping plates, several cooperation rods and rotating disc, the rotating disc is rotatably connected on bottom plate, the rotating disc is provided with plane helical groove, several cooperation rods are distributed along the axis of the rotating disc circumferentially, several cooperation rods are slidably connected in the plane helical groove, several clamping plates are one-to-one corresponding with several cooperation rods, the clamping plate is arranged on the cooperation rod, and the clamping plate is slidably connected on the bottom plate along the radial direction of the rotating disc.

[0008] By adopting the technical scheme, the worker places the spring on the bottom plate and parallel to the direction from the bottom plate to the top plate, at this time the spring can be clamped by the clamping assembly, the worker can rotate the rotating disc, the rotating disc rotates relative to the bottom plate, since the clamping plate is connected to the bottom plate in the radial direction of the rotating disc, the matching rod on the clamping plate moves in the planar spiral groove, the matching rod gradually approaches the axis direction of the rotating disc, the clamping plate gradually approaches the spring, until the spring is clamped, reducing the case that the spring horizontally moves when compressed, then the bottom plate is driven to move by the driving assembly, fatigue detection of the spring is performed.

[0009] Optionally, the clamping assembly further comprises a worm gear and a worm, the worm gear is coaxially arranged with the rotating disc, the worm gear is arranged on the rotating disc, the worm is rotationally connected to the bottom plate, and the worm is engaged with the worm gear.

[0010] By adopting the technical scheme, when the worker needs to drive the rotating disc to rotate, the worm is rotated, the worm drives the worm gear to rotate, the worm gear drives the rotating disc to rotate, the worm gear and the worm have a self-locking effect, reducing the self-rotation of the rotating disc during fatigue testing, and improving the reliability of the clamping assembly clamping the spring.

[0011] Optionally, the top plate is provided with a top table, the diameter of the top table gradually increases along the direction from the bottom plate to the top plate, and the spring abuts against the inclined surface of the top table.

[0012] By adopting the technical scheme, the top table and the clamping assembly make the spring in fatigue testing in a vertical state, reducing the case that the spring is twisted during fatigue testing, and causing the test result to be not accurate.

[0013] Optionally, the top plate is connected to the rack in the sliding direction of the bottom plate, and the rack is provided with an adjusting member for adjusting the distance between the top plate and the bottom plate.

[0014] By adopting the technical scheme, different specifications of the spring result in different original lengths of the spring, the distance between the top plate and the bottom plate is changed, different original lengths of the spring are adapted, and the application range of fatigue testing is improved.

[0015] Optionally, the adjusting member comprises an adjusting screw, the length direction of the adjusting screw is parallel to the sliding direction of the top plate, the adjusting screw is threadedly connected to the rack, and the adjusting screw is rotationally connected to the top plate.

[0016] By adopting the technical scheme, when the distance between the top plate and the bottom plate needs to be adjusted, the worker rotates the adjusting screw, the adjusting screw drives the top plate to move, until the top table on the top plate abuts against the upper end of the spring, the adjusting member has a simple structure and high adjustment accuracy.

[0017] Optionally, the driving assembly comprises a driving motor, a first block, a first rod and a second rod, the driving motor is arranged on the frame, the first block is arranged on the bottom plate, one end of the first rod is rotatably connected to the first block, and two ends of the second rod are respectively connected to the other end of the first rod and the output shaft of the driving motor.

[0018] By adopting the above technical scheme, the bottom plate needs to move reciprocally towards the top plate in the fatigue test process, so that the spring is compressed, for testing the durability of the spring, in the working process, the driving motor drives the second rod to rotate, the second rod drives the first rod to rotate, the first rod rotates relative to the first block to lift the bottom plate, forming a crank connecting structure, and the driving assembly is simple in structure and convenient to operate.

[0019] Optionally, the first block is slidably connected to the bottom plate along the direction of the output shaft of the driving motor, the second rod comprises a second block, a third block and a connecting rod, the second block is rotatably connected to the first rod, the third block is arranged on the output shaft of the driving motor, and two ends of the connecting rod are rotatably connected to the second block and the third block, respectively, and the driving assembly further comprises a control member, the control member is used to drive the first block to move, so as to change the included angle between the connecting rod and the output shaft of the driving motor.

[0020] By adopting the above technical scheme, since the specifications of the return springs are various, the compressible lengths of the return springs are also different, so it is necessary to change the moving range of the bottom plate, the worker can drive the first block to move by the control member, change the position of the first block relative to the driving motor, since the connecting rod is fixed in length, the included angle between the connecting rod and the output shaft of the driving motor changes, the diameter of the rotation of the second block changes, so as to change the moving range of the first rod; when the included angle between the connecting rod and the output shaft of the driving motor gradually increases and exceeds a right angle, the diameter of the rotation of the second block decreases, the moving range of the bottom plate driven by the first rod decreases, so as to adapt to the compressible lengths of return springs of different specifications, and the application range of the fatigue testing machine is improved.

[0021] Optionally, the control member comprises a control screw, the length of the control screw is parallel to the sliding direction of the first block, the control screw is rotatably connected to the bottom plate, and the first block is threadedly connected to the control screw.

[0022] By adopting the above technical scheme, when it is necessary to adjust the included angle between the connecting rod and the output shaft of the driving motor, the worker can rotate the control screw, the control screw drives the first block to slide, changes the distance between the first block and the driving motor, so as to change the included angle between the connecting rod and the output shaft of the driving motor, and the sliding range of the bottom plate changes, so that the control member is simple in structure and convenient to operate.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] 1. The clamping assembly is used to clamp the spring, improve the limiting effect of the fatigue testing machine on the spring, and improve the accuracy of the test;

[0025] 2. The adjusting member is used to change the distance between the top plate and the bottom plate, suitable for reset springs of different lengths, and improves the application range of the equipment;

[0026] 3. The driving assembly is used to drive the bottom plate to move periodically towards the top plate, and the driving assembly can adjust and control the movement range of the bottom plate. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a structural schematic diagram of a fatigue testing machine for detecting elevator reset springs.

[0028] Figure 2 is Figure 1 a structural schematic diagram of the driving assembly in

[0029] Figure 3 is Figure 1 an exploded view of the clamping assembly in

[0030] Figure 4 is Figure 1 a structural schematic diagram of the adjusting member in

[0031] Reference signs: 1, rack; 2, top plate; 21, sliding groove; 3, bottom plate; 4, driving assembly; 41, driving motor; 42, first block; 43, first rod; 44, second rod; 441, second block; 442, third block; 443, connecting rod; 45, control member; 451, control screw; 452, control turntable; 5, clamping assembly; 51, clamping plate; 52, matching rod; 53, rotating disc; 54, worm gear; 55, worm; 56, matching turntable; 57, planar helical groove; 6, adjusting member; 61, adjusting screw; 62, adjusting disc; 7, top table. DETAILED DESCRIPTION

[0032] The following will be described in detail in combination with the accompanying Figure 1 - the accompanying Figure 4 The present application will be further described in detail.

[0033] The present application discloses a fatigue testing machine for detecting elevator reset springs. Referring to Figure 1 and Figure 2The utility model relates to a kind of fatigue testing machine for detecting elevator reset spring, including frame 1, top plate 2, bottom plate 3, drive assembly 4, clamping assembly 5 and adjusting piece 6, bottom plate 3 is slidably connected on frame 1 along vertical direction, drive assembly 4 is located below bottom plate 3, drive assembly 4 is used to drive bottom plate 3 to move, clamping assembly 5 is set on bottom plate 3, clamping assembly 5 is used to clamp spring, top plate 2 is located above bottom plate 3, top plate 2 is slidably connected on frame 1 along vertical direction, adjusting piece 6 is used to adjust the initial distance of bottom plate 3 and top plate 2.

[0034] Referring to Figure 1 And Figure 2 Drive assembly 4 includes drive motor 41, two first blocks 42, two first rods 43, two second rods 44 and control piece 45, drive motor 41 is fixedly set on frame 1, drive motor 41 is double-end motor, two first blocks 42 are correspondingly at the two output shafts of drive motor 41, first block 42 is slidably connected on the lower end surface of bottom plate 3 along the direction of the output shaft of drive motor 41, two first rods 43 correspond to two first blocks 42, and one end of first rod 43 is rotatably connected to first block 42 along the direction of the output shaft of drive motor 41, two second rods 44 correspond to two first rods 43, second rod 44 includes second block 441, third block 442 and connecting rod 443, second block 441 is rotatably connected to the other end of first rod 43 along the direction of the output shaft of drive motor 41, third block 442 is fixedly set on the output shaft corresponding to drive motor 41, and the two ends of connecting rod 443 are rotatably connected to second block 441 and third block 442 along the direction perpendicular to the output shaft of drive motor 41, and the rotation axes of the two ends of connecting rod 443 are parallel to each other.

[0035] Referring to Figure 1 And Figure 2 Control piece 45 includes control screw 451 and control turntable 452, control screw 451 is bidirectional screw, the length direction of control screw 451 is the output shaft of drive motor 41, control screw 451 is rotatably connected to bottom plate 3, two first blocks 42 are threadedly connected on the thread segments of control screw 451 with opposite rotation directions, control turntable 452 is coaxially arranged with control screw 451, control turntable 452 is fixedly set on one end of control screw 451, when first block 42 is slid on bottom plate 3 by the rotation of control screw 451, the included angle between connecting rod 443 and the output shaft of drive motor 41 changes.

[0036] Referring to Figure 1 And Figure 3The clamping assembly 5 comprises four clamping plates 51, four matching rods 52, a rotating disc 53, a worm wheel 54, a worm 55 and a matching rotating disc 56. The axis of the rotating disc 53 is vertically arranged. The upper end surface of the bottom plate 3 is provided with a cavity. The rotating disc 53 is rotatably arranged in the cavity. The upper end surface of the rotating disc 53 is provided with four planar spiral grooves 57. The four planar spiral grooves 57 are uniformly distributed along the circumferential direction of the axis of the rotating disc 53. The distance from the planar spiral grooves 57 to the axis of the rotating disc 53 gradually increases in the clockwise direction. The four matching rods 52 correspond to the four planar spiral grooves 57 one by one. The matching rods 52 are arranged in the planar spiral grooves 57. The upper end surface of the bottom plate 3 is provided with four sliding grooves 21. The four sliding grooves 21 correspond to the four matching rods 52 one by one. The sliding grooves 21 are communicated with the cavity. The length direction of the sliding grooves 21 is parallel to the radial direction of the rotating disc 53. The matching rods 52 pass through the sliding grooves 21. The four clamping plates 51 correspond to the four matching rods 52 one by one. The clamping plates 51 are fixedly arranged on the matching rods 52. The worm wheel 54 is arranged in the cavity. The worm wheel 54 is coaxially arranged with the rotating disc 53. The worm wheel 54 is fixedly arranged on the rotating disc 53. The worm 55 is arranged in the cavity. The worm 55 is rotatably connected to the bottom plate 3. The worm 55 is engaged with the worm wheel 54. One end of the worm 55 passes through the bottom plate 3. The matching rotating disc 56 is coaxially arranged with the worm 55. The matching rotating disc 56 is fixedly arranged on the end of the worm 55 passing through the bottom plate 3.

[0037] With reference to Figure 1 and Figure 4 The top plate 2 is provided with a top platform 7. The top platform 7 is coaxially arranged with the rotating disc 53. The diameter of the top platform 7 gradually increases in the direction from the bottom plate 3 to the top plate 2. The return spring is abutted against the side wall of the top platform 7. The adjusting member 6 comprises an adjusting screw 61 and an adjusting disc 62. The adjusting screw 61 is vertically arranged. The adjusting screw 61 is threadedly connected to the rack 1. The lower end of the adjusting screw 61 is rotatably connected to the upper end surface of the top plate 2. The adjusting disc 62 is coaxially arranged with the adjusting screw 61. The adjusting disc 62 is fixedly arranged on the upper end surface of the adjusting screw 61.

[0038] The working personnel first place the spring between the top plate 2 and the bottom plate 3. The spring is in a vertical state and is located between the four clamping plates 51. Then the working personnel rotate the matching rotating disc 56. The matching rotating disc 56 drives the worm 55 to rotate. The worm 55 drives the worm wheel 54 to rotate. The worm wheel 54 drives the rotating disc 53 to rotate. The matching rods 52 slide on the planar spiral grooves 57 on the rotating disc 53. The clamping plates 51 slide on the sliding grooves 21 until the spring is clamped. Then the adjusting disc 62 is rotated. The adjusting disc 62 drives the adjusting screw 61 to rotate. The adjusting screw 61 drives the top plate 2 to move until the top platform 7 on the top plate 2 is abutted against the spring. Then the position of the first block 42 can be adjusted according to the extension length of different springs so as to change the sliding range of the bottom plate 3 and better adapt to the extension length of different springs.

[0039] The above are all preferred embodiments of the present application, and do not limit the protection scope of the present application, so that: all equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A fatigue tester for testing an elevator return spring, characterized by: The utility model provides a kind of spring clamping device, including rack (1), top plate (2), bottom plate (3), drive assembly (4) and clamping assembly (5) with purpose clamping spring, the bottom plate (3) is slidably connected on the rack (1) in vertical direction, the top plate (2) is located above bottom plate (3), the top plate (2) is arranged on the rack (1), the drive assembly (4) is used to drive the bottom plate (3) reciprocating movement towards top plate (2) direction, the clamping assembly (5) includes several clamping plates (51), several cooperation rods (52) and rotating disc (53), the rotating disc (53) is rotatably connected on bottom plate (3), the rotating disc (53) is provided with plane helical groove (57), several cooperation rods (52) are distributed in the circumferential direction along the axis of the rotating disc (53), several cooperation rods (52) are slidably connected in plane helical groove (57), several clamping plates (51) are one-to-one corresponding with several cooperation rods (52), the clamping plate (51) is arranged on the cooperation rod (52), and the clamping plate (51) is slidably connected on the bottom plate (3) in the radial direction of rotating disc (53).

2. A fatigue tester for testing elevator return springs as defined in claim 1, characterized in that The clamping assembly (5) further includes worm gear (54) and worm (55), the worm gear (54) is coaxially arranged with the rotating disc (53), the worm gear (54) is arranged on the rotating disc (53), and the worm (55) is rotatably connected to the bottom plate (3), wherein the worm (55) is engaged with the worm gear (54).

3. A fatigue tester for testing elevator return springs as defined in claim 1, characterized in that The top plate (2) is provided with top platform (7), the diameter of the top platform (7) gradually increases in the direction from the bottom plate (3) to the top plate (2), and the spring abuts against the inclined surface of the top platform (7).

4. A fatigue tester for testing elevator return springs as defined in claim 3, characterized in that The top plate (2) is slidably connected to the rack (1) in the sliding direction of the bottom plate (3), and the rack (1) is provided with an adjusting member (6) for adjusting the distance between the top plate (2) and the bottom plate (3).

5. A fatigue tester for testing elevator return springs as defined in claim 4, characterized in that The adjusting member (6) includes an adjusting screw (61), the length direction of the adjusting screw (61) is parallel to the sliding direction of the top plate (2), the adjusting screw (61) is threadedly connected to the rack (1), and the adjusting screw (61) is rotatably connected to the top plate (2).

6. A fatigue tester for testing elevator return springs as defined in claim 1, characterized in that: The drive assembly (4) includes a drive motor (41), a first block (42), a first rod (43) and a second rod (44), the drive motor (41) is arranged on the rack (1), the first block (42) is arranged on the bottom plate (3), one end of the first rod (43) is rotatably connected to the first block (42), and the other ends of the second rod (44) are respectively connected to the other end of the first rod (43) and the output shaft of the drive motor (41).

7. A fatigue tester for testing elevator return springs as defined in claim 6, characterized in that The first block (42) is slidably connected to the bottom plate (3) in the direction of the output shaft of the driving motor (41), the second rod (44) comprises a second block (441), a third block (442) and a connecting rod (443), the second block (441) is rotatably connected to the first rod (43), the third block (442) is arranged on the output shaft of the driving motor (41), the two ends of the connecting rod (443) are rotatably connected to the second block (441) and the third block (442) respectively, the driving assembly (4) further comprises a control member (45), the control member (45) is used for driving the first block (42) to move so as to change the included angle between the connecting rod (443) and the output shaft of the driving motor (41).

8. A fatigue tester for testing elevator return springs as defined in claim 7, characterized in that The control member (45) comprises a control screw (451), the length of the control screw (451) is parallel to the sliding direction of the first block (42), the control screw (451) is rotatably connected to the bottom plate (3), and the first block (42) is threadedly connected to the control screw (451).

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