Chain rotation fatigue testing machine

Abstract

The utility model discloses a chain rotation fatigue testing machine, belongs to the technical field of fatigue testing machines, and aims to solve the problems that the torque, the power, the loading force, the rotating speed and the number of rotating turns of a transmission shaft on the transmission shaft cannot be measured in real time and the speed regulation ratio is small in the prior art. The device comprises a supporting platform; the driving shaft assembly is fixedly arranged on the supporting platform and at least comprises driving chain wheels arranged at the two ends; the driven shaft assembly and the driving shaft assembly are arranged on the supporting platform in parallel, the driven shaft assembly at least comprises driven chain wheels arranged at the two ends, the two driving chain wheels and the two driven chain wheels form two sets of transmission chain wheels, and the two sets of transmission chain wheels are connected through two test chains respectively; the power driving mechanism drives the driving shaft assembly to rotate; and the horizontal distance of the driven shaft assembly is adjusted through the horizontal position adjusting mechanism, so that the distance between the driven shaft assembly and the driving shaft assembly is adjusted.

Description

Technical Field

[0001] The utility model belongs to the technical field of fatigue testing machines, and in particular relates to a chain rotation fatigue testing machine. Background Art

[0002] Chains are used as force transmission structures in various mechanical devices. As a force transmission structure, there are certain requirements for its performance. If the life of the automobile chain is short, it will cause engine damage and cause great losses. Automobile chains are troublesome to replace and the replacement price is also high. Therefore, the life of the chain has a great impact on the later maintenance costs of the car.

[0003] At present, the life test technology for automobile chains under tension is not mature. There is a lack of a chain life test bench that can change the tension in real time, adjust the speed in real time, and has a large speed ratio. It can also measure the torque, power, loading force, speed, and number of rotations of the transmission shaft in real time. Utility Model Content

[0004] The purpose of the utility model is to propose a chain rotation fatigue testing machine to solve the problems of the prior art that the torque, power, loading force, rotation speed, number of rotations of the transmission shaft cannot be measured in real time, and the speed ratio is small. The utility model is mainly used for fatigue life testing of chains under rated loads, adopts a servo motor to adjust the speed, and has a very high speed ratio.

[0005] To achieve the above purpose, the chain rotation fatigue testing machine of the utility model comprises:

[0006] Support platform;

[0007] A driving shaft assembly fixedly arranged on the supporting platform, wherein the driving shaft assembly at least comprises driving sprockets arranged at both ends;

[0008] A driven shaft assembly is arranged on the support platform in parallel with the driving shaft assembly, the driven shaft assembly at least comprising driven sprockets arranged at both ends, two driving sprockets and two driven sprockets constitute two sets of transmission sprockets, and the two sets of transmission sprockets are respectively connected by two test chains;

[0009] A power drive mechanism, through which the driving shaft assembly is driven to rotate;

[0010] And a horizontal position adjustment mechanism, through which the horizontal distance of the driven shaft assembly is adjusted, thereby adjusting the distance between the driven shaft assembly and the driving shaft assembly.

[0011] The support platform comprises:

[0012] Base;

[0013] And a workbench fixedly arranged on the base.

[0014] The driving shaft assembly comprises:

[0015] Active shaft;

[0016] First high-speed bearing boxes are arranged at both ends of the driving shaft, and the two first high-speed bearing boxes are supported on the supporting platform through active supports;

[0017] And a driving sprocket, wherein two driving sprockets are coaxially arranged at two ends of the driving shaft.

[0018] The driven shaft assembly comprises:

[0019] Driven shaft;

[0020] Second high-speed bearing boxes are arranged at both ends of the driven shaft, and the two second high-speed bearing boxes are supported on the support platform through driven supports;

[0021] And a driving sprocket, wherein two driving sprockets are coaxially arranged at two ends of the driven shaft.

[0022] The power drive mechanism comprises:

[0023] A rotary servo motor fixedly arranged on the supporting platform;

[0024] A driving gear coaxially arranged on the output shaft of the rotary servo motor;

[0025] A driven gear wheel coaxially arranged on the driving shaft of the driving shaft assembly;

[0026] And a first toothed belt connected between the driving toothed wheel and the driven toothed wheel.

[0027] The horizontal position adjustment mechanism comprises:

[0028] A moving crossbeam arranged parallel to the driven shaft assembly, wherein two through holes perpendicular to the moving crossbeam are arranged at both ends of the moving crossbeam;

[0029] Two nuts arranged at positions corresponding to the through holes on a side surface of the moving crossbeam;

[0030] a connecting rod connected between the moving cross beam and the driven connecting beam of the driven shaft assembly;

[0031] A first ball screw, wherein the first ball screw forms a screw-nut pair with the moving cross beam through a nut, and the first ball screw passes through a through hole of the moving cross beam and is rotatably matched with the driving shaft assembly through a bearing;

[0032] A second ball screw, wherein the second ball screw forms a screw-nut pair with the moving cross beam through another nut, and the second ball screw passes through another through hole of the moving cross beam and is rotatably matched with the driving shaft assembly through a bearing;

[0033] Two linear guide rails are fixedly arranged on the support platform, the linear guide rails and the driven shaft assembly are vertically arranged, and two ends of the lower surface of the driven support of the driven shaft assembly are respectively slidably matched with the two linear guide rails;

[0034] And an adjusting power unit, through which the first ball screw and the second ball screw are driven to rotate synchronously.

[0035] The fatigue testing machine further comprises a force sensor, which is arranged at the connection between the connecting rod and the driven shaft assembly, and measures the loading force on the driven shaft assembly through the force sensor.

[0036] The regulating power unit comprises:

[0037] A loading servo motor is supported and fixed on the supporting platform;

[0038] A reducer is provided at the output end of the adjustment click;

[0039] A driving gear arranged at the output end of the reducer;

[0040] A fixed beam fixed on the support platform, wherein the first ball screw and the second ball screw are rotatably matched with the fixed beam through bearings, and the ends of the first ball screw extend relative to the side of the fixed beam;

[0041] a first driven gear disposed at an end of the first ball screw;

[0042] a second driven gear disposed at an end of the second ball screw;

[0043] A tensioning wheel is arranged on a side of the fixed beam opposite to the loading servo motor, and the axes of the driving gear, the first driven gear, the second driven gear and the tensioning wheel are parallel;

[0044] and a second toothed belt, wherein the second toothed belt sequentially passes around the driving gear, the first driven gear, the tensioning wheel and the second driven gear to form a belt transmission.

[0045] The fatigue testing machine further comprises a dynamic torque sensor, which is arranged at a middle position of the driven shaft assembly, and measures the dynamic torque of the driven shaft assembly through the dynamic torque sensor.

[0046] The first high-speed bearing box of the driving shaft assembly and the second high-speed bearing box of the driven shaft assembly are both provided with a water inlet on the top and a water outlet on the bottom, and the chiller is respectively connected to the water inlet and the water outlet for circulating heat dissipation.

[0047] The beneficial effects of the utility model are as follows: the chain rotary fatigue testing machine of the utility model provides support for the test chain through the driving shaft assembly and the driven shaft assembly arranged on the workbench; in addition, the relative distance between the driven shaft assembly and the driving shaft assembly can be adjusted by the horizontal position adjustment mechanism, and the test space can be adjusted, which is convenient for replacing the chain while applying a load to the test chain. The force sensor and dynamic torque sensor provided in the utility model can measure the torque and power exerted on the transmission shaft, measure the loading force, measure the rotation speed, and measure the number of rotations of the transmission shaft. The number of rotations or time can be used as a reference for the life of the chain in fatigue tests. The power drive part adopts a toothed belt connection drive, which has good stability. The overall structure of the utility model is simple and easy to operate. The transmission shaft speed of the utility model is adjustable, and the rotation speed is adjusted by a rotary servo motor, which has a very high speed regulation ratio. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 This is a structural schematic diagram of a chain rotary fatigue testing machine of the utility model from one viewing angle;

[0049] Figure 2 This is a schematic structural diagram of the chain rotary fatigue testing machine of the utility model from another perspective;

[0050] Figure 3 This is a schematic diagram of the structure of the chain rotary fatigue testing machine of the utility model after the support platform is hidden;

[0051] Figure 4 It is a schematic diagram of the structure of the power drive mechanism driving the active shaft assembly in the chain rotary fatigue testing machine of the utility model;

[0052] Figure 5 This is a schematic diagram of the structure of the driven shaft assembly in the chain rotary fatigue testing machine of the utility model;

[0053] Figure 6 This is a schematic diagram of the structure of the adjusting power unit in the chain rotary fatigue testing machine of the utility model;

[0054] Among them: 1. Support platform, 101. Base, 102. Workbench, 2. Active shaft assembly, 201. Active shaft, 202. First high-speed bearing box, 203. Active support, 204. Active sprocket, 3. Driven shaft assembly, 301. Driven shaft, 302. Second high-speed bearing box, 303. Driven support, 304. Driven sprocket, 4. Power drive mechanism, 401. Rotating servo motor, 402. Active gear wheel, 403. Driven gear wheel, 4 04. First toothed belt, 5. Horizontal position adjustment mechanism, 501. Moving beam, 502. Nut, 503. Connecting rod, 504. First ball screw, 505. Second ball screw, 506. Linear guide, 507. Loading servo motor, 508. Reducer, 509. Driving gear, 510. Fixed beam, 511. First driven gear, 512. Second driven gear, 513. Tensioning wheel, 6. Force sensor, 7. Dynamic torque sensor. DETAILED DESCRIPTION

[0055] The embodiments of the present utility model will be further described below in conjunction with the accompanying drawings.

[0056] See also Figure 1-Figure 6 The chain rotation fatigue testing machine of the utility model comprises:

[0057] Support platform 1;

[0058] A driving shaft assembly 2 fixedly arranged on the supporting platform 1, wherein the driving shaft assembly 2 at least comprises driving sprockets 204 arranged at both ends;

[0059] A driven shaft assembly 3 is arranged on the support platform 1 in parallel with the driving shaft assembly 2, and the driven shaft assembly 3 at least includes driven sprockets 304 arranged at both ends, and the two driving sprockets 204 and the two driven sprockets 304 constitute two sets of transmission sprockets, and the two sets of transmission sprockets are respectively connected by two test chains;

[0060] A power drive mechanism 4, which drives the driving shaft assembly 2 to rotate;

[0061] And a horizontal position adjustment mechanism 5, through which the horizontal distance of the driven shaft assembly 3 is adjusted, thereby adjusting the distance between the driven shaft assembly 3 and the driving shaft assembly 2.

[0062] The support platform 1 comprises:

[0063] Base 101;

[0064] And a workbench 102 fixedly arranged on the base 101 .

[0065] The driving shaft assembly 2 comprises:

[0066] Active shaft 201;

[0067] First high-speed bearing boxes 202 are arranged at both ends of the driving shaft 201, and the two first high-speed bearing boxes 202 are supported on the supporting platform 1 through active supports 203;

[0068] And a driving sprocket 204 , wherein the two driving sprockets 204 are coaxially arranged at two ends of the driving shaft 201 .

[0069] The driven shaft assembly 3 comprises:

[0070] Driven shaft 301;

[0071] Second high-speed bearing boxes 302 are arranged at both ends of the driven shaft 301, and the two second high-speed bearing boxes 302 are supported on the support platform 1 through driven supports 303;

[0072] And a driving sprocket 204 , wherein the two driving sprockets 204 are coaxially arranged at two ends of the driven shaft 301 .

[0073] The power drive mechanism 4 comprises:

[0074] A rotary servo motor 401 fixedly arranged on the supporting platform 1;

[0075] A driving gear wheel 402 coaxially arranged on the output shaft of the rotary servo motor 401;

[0076] A driven gear wheel 403 coaxially arranged on the driving shaft 201 of the driving shaft assembly 2;

[0077] And a first toothed belt 404 connected between the driving toothed wheel 402 and the driven toothed wheel 403 .

[0078] The horizontal position adjustment mechanism 5 comprises:

[0079] A moving beam 501 arranged parallel to the driven shaft assembly 3, and two through holes perpendicular to the moving beam 501 are arranged at both ends of the moving beam 501;

[0080] Two nuts 502 are arranged at positions corresponding to the through holes on a side of the moving crossbeam 501;

[0081] A connecting rod 503 connected between the moving cross beam 501 and the driven connecting beam 305 of the driven shaft assembly 3;

[0082] A first ball screw 504, wherein the first ball screw 504 forms a screw-nut 502 pair with the moving cross beam 501 through a nut 502, and the first ball screw 504 rotates with the driving shaft assembly 2 through a bearing after passing through a through hole of the moving cross beam 501;

[0083] A second ball screw 505, wherein the second ball screw 505 forms a screw nut 502 pair with the moving cross beam 501 through another nut 502, and the second ball screw 505 rotates with the driving shaft assembly 2 through a bearing after passing through another through hole of the moving cross beam 501;

[0084] Two linear guide rails 506 are fixedly arranged on the support platform 1, the linear guide rails 506 and the driven shaft assembly 3 are vertically arranged, and the two ends of the lower surface of the driven support 303 of the driven shaft assembly 3 are respectively slidably matched with the two linear guide rails 506;

[0085] And an adjusting power unit, through which the first ball screw 504 and the second ball screw 505 are driven to rotate synchronously.

[0086] The fatigue testing machine further includes a force sensor 6 , which is disposed at the connection between the connecting rod 503 and the driven shaft assembly 3 , and the loading force on the driven shaft assembly 3 is measured by the force sensor 6 .

[0087] The regulating power unit comprises:

[0088] A loading servo motor 507 supported and fixed on the supporting platform 1;

[0089] A reducer 508 is provided at the output end of the adjustment click;

[0090] A driving gear 509 disposed at the output end of the speed reducer 508;

[0091] A fixed beam 510 fixed on the support platform 1, wherein the first ball screw 504 and the second ball screw 505 are rotatably matched with the fixed beam 510 through bearings, and the ends thereof extend out from the side of the fixed beam 510;

[0092] A first driven gear 511 disposed at an end of the first ball screw 504;

[0093] A second driven gear 512 disposed at the end of the second ball screw 505;

[0094] A tensioning wheel 513 is arranged on a side of the fixed beam 510 opposite to the loading servo motor 507, and the axes of the driving gear 509, the first driven gear 511, the second driven gear 512 and the tensioning wheel 513 are parallel;

[0095] And a second toothed belt, which is passed through the driving gear 509, the first driven gear 511, the tensioning wheel 513 and the second driven gear 512 in sequence to form a belt drive.

[0096] The fatigue testing machine further includes a dynamic torque sensor 7 , which is disposed at a middle position of the driven shaft assembly 3 , and the dynamic torque of the driven shaft assembly 3 is measured by the dynamic torque sensor 7 .

[0097] The first high-speed bearing box 202 of the driving shaft assembly 2 and the second high-speed bearing box 302 of the driven shaft assembly 3 are both provided with a water inlet on the top and a water outlet on the bottom, and the chiller is respectively connected to the water inlet and the water outlet for circulating heat dissipation.

[0098] In this embodiment, the first high-speed bearing box 202 of the driving shaft assembly 2 and the second high-speed bearing box 302 of the driven shaft assembly 3 use imported NHK bearings;

[0099] The model of dynamic torque sensor 7 used is HLT-171, 300Nm;

[0100] The model of the loading servo motor 507 is MSMF, 200W;

[0101] The model used by the rotary servo motor 401 is Z18-4022RC15;

[0102] The model of the force sensor 6 is CZ21, 10kN.

[0103] The driven shaft assembly 3 and the driving shaft assembly 2 are placed on the workbench 102 of the utility model. The driven shaft assembly 3 can move left and right along the linear guide rail 506. The loading servo motor 507 adopts the Japanese Panasonic loading servo motor 507 and the reducer 508 to drive the first ball screw 504 and the second ball screw 505 to rotate and drive the moving beam 501 to move, thereby driving the driven shaft assembly 3 to move left and right, which can not only adjust the space but also load the chain.

[0104] The driven shaft assembly 3 includes two second high-speed bearing boxes 302, with a dynamic torque sensor 7 in the middle. The second high-speed bearing box 302 has a water inlet on the top and a water outlet on the bottom. The cooling water circulates through the chiller to dissipate the heat of the bearing. A temperature measuring thermocouple is installed on the bearing to measure the bearing temperature.

[0105] The driving shaft assembly 2 includes two first high-speed bearing boxes 202, which are driven to rotate by a rotating servo motor 401; the rotating servo motor 401 is placed at the end parallel to the driving shaft 201, and the driving shaft 201 is driven to rotate through a high-speed first toothed belt 404. The first high-speed bearing box 202 has a water inlet on the top and a water outlet on the bottom, and the cooling water circulated by the chiller is used to dissipate the heat of the bearing; a temperature measuring thermocouple is installed on the bearing to measure the bearing temperature.

[0106] The technical indicators that can be achieved by this utility model are:

[0107] 1. Force loading range: 10kN, measurement accuracy: ±1%;

[0108] 2. Maximum moving speed: 250mm / min;

[0109] 3. Torque measurement range: 300Nm, measurement accuracy: ±1%;

[0110] 4. The speed range of the driving shaft 201: 1500~8000rpm;

[0111] 5. Speed ​​measurement accuracy: 1%;

[0112] 6. Cycle times range: 10 9 ;

[0113] 7. Lubricating oil source: flow rate 10L / min, oil temperature control range: room temperature ~ 120℃;

[0114] 8. Center distance between two axes: 290~500mm;

[0115] The utility model has protection modes such as upper and lower limits of force, upper and lower limits of torque, upper and lower limits of speed, number of cycles, and time-out. It can judge equipment failure and sample breakage, and alarm and shut down. It can measure bearing temperature and alarm and shut down when the temperature exceeds the limit. It can measure lubricating oil temperature, flow rate, and liquid level, and has the function of alarming and shutting down when the temperature is high or the liquid level is low. It can draw and record test curves such as load, torque, and power, and the recorded data can be analyzed using other software.

Claims

1. Chain rotation fatigue testing machine, including: Support platform (1); It is characterized by further comprising: A driving shaft assembly (2) fixedly arranged on the supporting platform (1), the driving shaft assembly (2) comprising at least driving sprockets (204) arranged at two ends; A driven shaft assembly (3) is arranged on the support platform (1) in parallel with the driving shaft assembly (2), the driven shaft assembly (3) at least comprising driven sprockets (304) arranged at two ends, the two driving sprockets (204) and the two driven sprockets (304) forming two sets of transmission sprockets, and the two sets of transmission sprockets are respectively connected by two test chains; A power drive mechanism (4), which drives the driving shaft assembly (2) to rotate; and a horizontal position adjustment mechanism (5), through which the horizontal distance of the driven shaft assembly (3) is adjusted, thereby adjusting the distance between the driven shaft assembly (3) and the driving shaft assembly (2).

2. The chain rotation fatigue testing machine according to claim 1, characterized in that: The support platform (1) comprises: Base (101); And a workbench (102) fixedly arranged on the base (101).

3. The chain rotation fatigue testing machine according to claim 1, characterized in that: The driving shaft assembly (2) comprises: Active shaft (201); First high-speed bearing boxes (202) are arranged at both ends of the driving shaft (201), and the two first high-speed bearing boxes (202) are supported on the supporting platform (1) through active supports (203); and a driving sprocket (204), wherein the two driving sprockets (204) are coaxially arranged at two ends of the driving shaft (201).

4. The chain rotation fatigue testing machine according to claim 1, characterized in that: The driven shaft assembly (3) comprises: Driven shaft (301); Second high-speed bearing boxes (302) are arranged at both ends of the driven shaft (301), and the two second high-speed bearing boxes (302) are supported on the support platform (1) through driven supports (303); and a driving sprocket (204), wherein the two driving sprockets (204) are coaxially arranged at two ends of the driven shaft (301).

5. The chain rotation fatigue testing machine according to claim 1, characterized in that: The power drive mechanism (4) comprises: A rotary servo motor (401) fixedly arranged on the supporting platform (1); A driving gear wheel (402) coaxially arranged on the output shaft of the rotary servo motor (401); A driven gear wheel (403) coaxially arranged on the driving shaft (201) of the driving shaft assembly (2); and a first toothed belt (404) connected between the driving toothed wheel (402) and the driven toothed wheel (403).

6. The chain rotation fatigue testing machine according to claim 1, characterized in that: The horizontal position adjustment mechanism (5) comprises: A moving crossbeam (501) arranged parallel to the driven shaft assembly (3), wherein two through holes perpendicular to the moving crossbeam (501) are arranged at both ends of the moving crossbeam (501); Two nuts (502) are arranged at positions corresponding to the through holes on a side surface of the movable crossbeam (501); A connecting rod (503) connected between the moving cross beam (501) and the driven connecting beam (305) of the driven shaft assembly (3); A first ball screw (504), wherein the first ball screw (504) forms a screw nut (502) pair with the movable cross beam (501) through a nut (502), and the first ball screw (504) passes through a through hole of the movable cross beam (501) and rotates with the driving shaft assembly (2) through a bearing; A second ball screw (505), wherein the second ball screw (505) forms a screw nut (502) pair with the moving cross beam (501) through another nut (502), and the second ball screw (505) passes through another through hole of the moving cross beam (501) and rotates with the driving shaft assembly (2) through a bearing; Two linear guide rails (506) are fixedly arranged on the support platform (1), the linear guide rails (506) and the driven shaft assembly (3) are arranged vertically, and the two ends of the lower surface of the driven support (303) of the driven shaft assembly (3) are respectively slidably matched with the two linear guide rails (506); and an adjusting power unit, through which the first ball screw (504) and the second ball screw (505) are driven to rotate synchronously.

7. The chain rotation fatigue testing machine according to claim 6, characterized in that: The fatigue testing machine further comprises a force sensor (6), wherein the force sensor (6) is arranged at the connection between the connecting rod (503) and the driven shaft assembly (3), and the loading force on the driven shaft assembly (3) is measured by the force sensor (6).

8. The chain rotation fatigue testing machine according to claim 6, characterized in that: The regulating power unit comprises: A loading servo motor (507) is supported and fixed on the supporting platform (1); A reducer (508) is provided at the output end of the adjustment click; A driving gear (509) disposed at the output end of the speed reducer (508); A fixed crossbeam (510) fixed on the support platform (1), wherein the first ball screw (504) and the second ball screw (505) are rotatably matched via bearings and the fixed crossbeam (510), and the ends thereof extend out from the side of the fixed crossbeam (510); A first driven gear (511) disposed at an end of the first ball screw (504); A second driven gear (512) disposed at an end of the second ball screw (505); A tensioning wheel (513) is arranged on a side of the fixed crossbeam (510) opposite to the loading servo motor (507), wherein the axes of the driving gear (509), the first driven gear (511), the second driven gear (512) and the tensioning wheel (513) are parallel; and a second toothed belt, wherein the second toothed belt sequentially passes around the driving gear (509), the first driven gear (511), the tensioning wheel (513) and the second driven gear (512) to form a belt drive.

9. The chain rotation fatigue testing machine according to claim 1, characterized in that: The fatigue testing machine further comprises a dynamic torque sensor (7), which is arranged at a middle position of the driven shaft assembly (3) and measures the dynamic torque of the driven shaft assembly (3) through the dynamic torque sensor (7).

10. The chain rotation fatigue testing machine according to claim 1, characterized in that: The first high-speed bearing box (202) of the driving shaft assembly (2) and the second high-speed bearing box (302) of the driven shaft assembly (3) are both provided with a water inlet on the top and a water outlet on the bottom, and the chiller is respectively connected to the water inlet and the water outlet for circulating heat dissipation.

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