A multi-working-condition loading test device for a ball screw pair

Abstract

The application discloses a kind of ball screw pair multi-working condition loading test device, is provided with loading ball screw pair;To be measured ball screw pair;Loading transmission system;Braking system;Loading ball screw pair will load torque T be converted into axial loading load and pass through connecting cylinder, connecting cylinder linear motion along two sides guide column and load load F is transmitted to the ball screw pair to be measured;Drive servo motor drives the linear motion of the ball nut to be measured by the rotary motion of the ball screw to be measured, and the loading test of the ball screw pair to be measured under the loading load F is realized in combination with loading load F. Compared with the existing hydraulic loading test device, the ball screw pair multi-working condition loading test device of the application can realize the loading test of the ball screw pair under any loading load and any running speed working condition, and compared with the hydraulic loading test device, the energy consumption is lower, the control is more accurate, the structure is simpler, more environmentally friendly, the manufacturing and test cost is more inexpensive and many other advantages.

Description

Technical Field

[0001] This invention belongs to the field of ball screw pair load-bearing capacity testing and verification, specifically relating to a testing and verification device that can realize ball screw pair under arbitrary load and arbitrary running speed conditions. Background Technology

[0002] Currently, the loading test of ball screw pairs mostly uses hydraulic cylinders to apply the load, which can realize simple loading tests under constant load and constant speed conditions. However, hydraulic loading devices have many disadvantages such as large size, unstable load, high energy consumption, and high manufacturing cost.

[0003] As the application of ball screw pairs becomes more and more widespread, such as in automotive steering and braking systems where variable load and speed transmission are common; in all-electric servo injection molding machines, ball screw pairs not only involve variable load and speed transmission, but also require the system to remain stationary and loaded for a certain period of time during transmission; the actual load conditions and motion states are becoming increasingly complex, and the original hydraulic loading test equipment can no longer meet the current loading test requirements of ball screw pairs. Summary of the Invention

[0004] The purpose of this invention is to solve the problem of difficult load testing of ball screw pairs under various working conditions, and to provide a multi-working-condition loading test device for ball screw pairs. The device has a simple structure, low energy consumption, and precise control, and can realize the test and verification of the load-bearing capacity of ball screw pairs under complex and variable working conditions.

[0005] To achieve the above-mentioned objectives, the following technical solution is adopted: The loading ball nut and the loading ball screw form a loading ball screw pair; the ball screw to be tested and the ball nut to be tested form a ball screw pair to be tested; the reducer is fixedly installed on the reducer base, and the reducer output shaft is connected to one side of the input shaft coupling; a pair of bearings are fixedly installed on the end of the ball screw to be tested using a lock nut, and are fixedly installed in the bearing housing of the ball screw to be tested through a bearing cover, and connected to the other side of the input coupling; the ball nut to be tested is connected to the loading ball nut through a connecting sleeve; the connecting sleeve... Guide posts are provided on both sides of the flange; a pair of bearings are fixedly installed on the end of the loading ball screw shaft with lock nuts, and are fixedly installed in the loading ball screw bearing housing through the loading ball screw bearing cover and connected to one side of the loading shaft coupling; the other side of the loading shaft coupling is connected to the torque sensor input shaft, and the loading small synchronous pulley is connected to the torque sensor output shaft; the loading small synchronous pulley and the loading large synchronous pulley form a loading transmission system through the loading synchronous belt; the loading large synchronous pulley is connected to the brake disc through the brake main shaft; the brake disc and the hydraulic brake caliper assembly form the braking system; The servo motor is connected to the small brake pulley, which is connected to the large brake pulley via the brake belt. The large brake pulley is fixedly mounted on the brake ball nut. The brake ball screw is threadedly connected to the hydraulic brake pump push rod. The square head of the brake ball screw is inserted into the square seat of the brake ball screw limit block to restrict the rotational movement of the brake ball screw. The servo motor drives the brake ball nut to rotate via the brake belt. The brake ball nut converts the rotational motion into the reciprocating extension and retraction motion of the brake ball screw, which is controlled by the hydraulic brake pump push rod. The brake fluid in the hydraulic brake pump on the pump mounting base enters the brake slave cylinder in the hydraulic brake caliper assembly through the brake fluid oil pipe. The brake slave cylinder pushes the brake friction pads to make contact with the brake disc, generating a loading torque T. The loading ball screw pair converts the loading torque T into an axial loading load F and transmits it to the connecting cylinder. The connecting cylinder moves linearly along the guide columns on both sides and transmits the loading load F to the ball screw pair under test. The drive servo motor drives the ball screw under test to convert the rotational motion into the linear motion of the ball nut under test. Combined with the loading load F, the loading test of the ball screw pair under test is realized under this loading load.

[0006] Furthermore, the locking nut secures a pair of angular contact bearings to the brake ball nut and installs them within the brake ball nut bearing housing.

[0007] Furthermore, during the loading test, the required load F of the ball screw pair consisting of the ball screw under test and the ball nut under test is converted into the loading torque T using the following formula. Formula (1) P h The lead of the loaded ball screw pair; η: Efficiency of the loaded ball screw pair.

[0008] Furthermore, during the test, the load F is converted into the load torque T using formula (1), and the load torque is preset for the brake servo motor. The torque sensor feeds back the actual load torque to the brake servo motor to form a closed-loop feedback system. The servo motor drives the ball screw pair consisting of the ball screw and the ball nut under test to move linearly according to the motion mode set by the speed (v) - time (t) curve, so as to realize the loading test under the set working conditions. Similarly, by setting any different loading load F and any speed (v)-time (t) curve, loading tests under any working condition can be achieved.

[0009] Compared with existing hydraulic loading test devices, the ball screw pair multi-condition loading test device of the present invention can realize loading tests of ball screw pairs under arbitrary loading loads and arbitrary running speed conditions. It also has many advantages over hydraulic loading test devices, such as lower energy consumption, more precise control, simpler structure, more environmental protection, and lower manufacturing and testing costs. Attached Figure Description

[0010] Figure 1 This is a structural diagram of the present invention; Figure 2 This is a schematic diagram of the servo braking system of the present invention; Figure 3 This is an example diagram of the loading test speed-load of the present invention; Explanation of reference numerals in the attached diagram: 1-Drive servo motor; 2-Reducer base; 3-Reducer; 4-Input shaft coupling; 5-Ball screw bearing housing under test; 6-Ball screw bearing cover under test; 7-Ball screw under test; 8-Ball nut under test; 9-Guide column; 10-Connecting cylinder; 11-Loading ball nut; 12-Loading ball screw; 13-Loading ball screw bearing cover; 14-Loading ball screw bearing housing; 15-Loading shaft coupling; 16-Torque sensor; 17-Small loading synchronous pulley; 18-Loading synchronous belt; 19-Large loading synchronous pulley; 20-Brake spindle; 21-Brake disc bearing housing; 22-Hydraulic brake caliper assembly; 23-Brake disc; 24-Brake fluid pipe; 25-Hydraulic brake pump; 26-Hydraulic brake pump mounting base; 27-Brake ball nut bearing housing; 28-Brake ball screw; 29-Brake large synchronous belt pulley; 30-Brake ball nut; 31-Brake ball screw limit block; 32-Brake synchronous belt; 33-Brake small synchronous belt pulley; 34-Brake servo motor; 35-Locking nut; 36-Bearing cover; 37-Angular contact bearing; 001-Worktable surface; 252-Hydraulic brake pump push rod. Detailed Implementation

[0011] The following is in conjunction with the appendix Figure 1 , Figure 2 , Figure 3 To further explain the content of this invention, the actual manufacturing structure of this invention is not limited to the following embodiments.

[0012] Referring to the accompanying drawings, the multi-condition loading test device for ball screw pairs of the present invention consists of a drive servo motor 1, a reducer 3, a ball screw under test 7, a loading ball screw 12, a torque sensor 16, a loading small synchronous pulley 17, a loading large synchronous pulley 19, a hydraulic brake caliper assembly 22, a brake disc 23, a hydraulic brake pump 25, a brake ball screw 28, a brake large synchronous pulley 29, a brake ball nut 30, a brake small synchronous pulley 33, a brake servo motor 34, and a worktable 001, etc.

[0013] The dynamic load of the loading ball screw pair consisting of the loading ball nut 11 and the loading ball screw 12 is several times that of the ball screw pair consisting of the ball screw 7 and the ball nut 8. This can avoid the impact on the accuracy of the test caused by the large change in transmission efficiency due to raceway fatigue wear of the loading ball screw pair.

[0014] When the multi-condition loading test device for ball screw pairs of the present invention is executed Figure 3 During the loading test shown, the required load F of the ball screw pair consisting of the ball screw under test 7 and the ball nut under test 8 can be converted into the loading torque T by the following formula. Formula (1) P h The lead of the loaded ball screw pair; η: Efficiency of the loaded ball screw pair; The brake servo motor 34 drives the brake ball nut 30 to rotate through the brake small synchronous pulley 33, the brake synchronous belt 32, and the brake large synchronous pulley 29. Due to the square hole set in the brake ball screw limit block 31, the rotation of the brake ball screw 28 is restricted, forcing the brake ball screw 28 to make linear motion. The hydraulic brake pump push rod 252 is connected to the brake ball screw 28 by threads. The hydraulic brake pump push rod 252 pushes the brake fluid in the hydraulic brake pump 25 through the brake fluid oil pipe 24 into the brake slave cylinder of the hydraulic brake caliper assembly 22. The brake slave cylinder pushes the brake friction pad to make contact with the brake disc 23 to generate a loading torque T. The loading torque T is transmitted to the loading ball screw pair composed of the loading ball nut 11 and the loading ball screw 12 through the brake main shaft 20, the loading large synchronous pulley 19, the loading synchronous belt 18, the loading small synchronous pulley 17, the torque sensor 16, and the loading shaft coupling 15.

[0015] The loading ball screw pair converts the loading torque T into an axial loading load F, which is transmitted through the connecting cylinder 10. The connecting cylinder 10 moves linearly along the guide columns 9 on both sides and transmits the loading load F to the ball screw pair to be tested, which consists of the ball screw 7 to be tested and the ball nut 8 to be tested.

[0016] During the test, according to Figure 3 The test is conducted in three stages within one cycle: Stage ①: The 5KN load is accelerated to 150mm / s; Stage ②: The 10KN load runs at a constant speed of 150mm / s; Stage ③: The 5KN load runs at a constant speed of 50mm / s. The applied load F is converted into the applied torque T by the above formula (1) and the applied torque is preset for the brake servo motor 34. The torque sensor 16 feeds back the actual applied torque to the brake servo motor 34 to form a closed-loop feedback system. The closed-loop feedback system can promptly correct the changes in applied torque T caused by the wear of the brake friction pads on the brake caliper assembly 22, thereby ensuring the stability of the applied load F.

[0017] Drive servo motor 1 Figure 3 The velocity (v)-time (t) curve shown indicates that the motion mode in stages ①②③ drives the linear motion of the ball screw pair consisting of the ball screw 7 and the ball nut 8 under test. In this way, the multi-condition loading test device for ball screw pairs of the present invention can achieve… Figure 3 Loading test under the conditions shown.

[0018] Similarly, by setting any different loading load F and any speed (v)-time (t) curve, loading tests under any working condition can be achieved. The ball screw pair multi-condition loading test device of this invention adopts the above-mentioned closed-loop feedback system, which makes the loading load F more precisely controlled. Compared with traditional hydraulic loading devices, it has a simpler structure without hydraulic station, solenoid valve, hydraulic pipe and other components. It can provide the loading load with only a small power servo motor, resulting in lower power consumption. It is also more environmentally friendly because there are no problems such as hydraulic oil leakage during operation, and it has the advantages of lower manufacturing cost.

[0019] Working principle: This invention relates to a multi-condition loading test device for ball screw pairs. The brake servo motor 34 converts the rotational motion of the brake servo motor 34 into the linear motion of the brake ball screw 28 through components such as the brake small synchronous pulley 33, brake synchronous belt 32, brake large synchronous pulley 29, brake ball nut 30, and brake ball screw 28. This controls the change in the brake fluid pressure in the hydraulic brake pump 25. After the brake friction pads of the hydraulic brake caliper assembly 22 are in contact with the brake disc 23, different loading torques T are generated under different brake fluid pressures. The loading torque T is transmitted to the loading ball screw pair composed of the loading ball nut 11 and the loading ball screw 12 through components such as the brake main shaft 20, loading large synchronous pulley 19, torque sensor 16, and loading shaft coupling 15.

[0020] The loading ball screw pair converts the loading torque T into an axial loading load F, which is then transmitted to the ball screw pair under test, consisting of the ball screw 7 and the ball nut 8, via the connecting cylinder 10. The drive servo motor 1 drives the ball screw pair under test, consisting of the ball screw 7 and the ball nut 8, to move linearly along the guide column 9 according to a set speed (v)-time (t) curve. This enables the multi-condition loading test device for ball screw pairs of the present invention to perform loading tests under the set conditions.

[0021] The above description is merely a specific embodiment of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A multi-condition loading test device for ball screw pairs, characterized in that, The loading ball nut (11) and the loading ball screw (12) form a loading ball screw pair, and the ball screw to be tested (7) and the ball nut to be tested (8) form a ball screw pair to be tested; the reducer (3) is fixedly installed on the reducer base (2), and the output shaft of the reducer (3) is connected to the input shaft coupling (4) on one side; the end of the ball screw to be tested (7) is fixedly installed with a lock nut and a pair of bearings are fixedly installed in the bearing seat (5) of the ball screw to be tested through the bearing cover (6) of the ball screw to be tested and connected to the other side of the input coupling (3); the ball nut to be tested (8) is connected to the loading ball nut (11) through the connecting sleeve (10); guide columns (9) are provided on both sides of the flange of the connecting sleeve (10); the loading ball screw (12) A pair of bearings are fixedly installed at the shaft end with a lock nut and then fixedly installed in the loading ball screw bearing seat (14) through the loading ball screw bearing cover (13) and connected to one side of the loading shaft coupling (15); the other side of the loading shaft coupling (15) is connected to the input shaft of the torque sensor (16); the loading small synchronous pulley (17) is connected to the output shaft of the torque sensor (16); the loading small synchronous pulley (17) and the loading large synchronous pulley (19) form a loading transmission system through the loading synchronous belt (18); the loading large synchronous pulley (19) is connected to the brake disc (23) through the brake spindle (20); the brake disc (23) and the hydraulic brake caliper assembly (22) form a braking system; the brake servo motor (34) and The small brake pulley (33) is connected to the brake small synchronous pulley (33), which is connected to the brake large synchronous pulley (29) via the brake synchronous belt (32). The brake large synchronous pulley (29) is fixedly installed on the brake ball nut (30). The brake ball screw (28) is connected to the hydraulic brake pump push rod (252) via a thread. The square head of the brake ball screw (28) is inserted into the square seat of the brake ball screw limit block (31) to restrict the rotation of the brake ball screw (28). The brake servo motor (34) drives the brake ball nut (30) to rotate via the brake synchronous belt (32). The brake ball nut (30) converts the rotation into the reciprocating extension and retraction motion of the brake ball screw (28), which is transmitted through the hydraulic brake pump push rod (252). 52) The brake fluid in the hydraulic brake pump (25) installed on the hydraulic brake pump mounting base (26) is controlled to enter the brake slave pump set in the hydraulic brake caliper assembly (22) through the brake fluid oil pipe (24). The brake slave pump pushes the brake friction pad to fit against the brake disc (23) to generate a loading torque T. The loading ball screw pair converts the loading torque T into an axial loading load F and transmits it to the connecting cylinder (10). The connecting cylinder (10) moves linearly along the two guide columns (9) and transmits the loading load F to the ball screw pair under test. The drive servo motor (1) drives the ball screw (7) under test to convert the rotational motion into the linear motion of the ball nut (8) under test. Combined with the loading load F, the loading test of the ball screw pair under test is realized under the loading load.

2. The multi-condition loading test device for ball screw pairs as described in claim 1, characterized in that, The locking nut (35) secures a pair of angular contact bearings (37) to the brake ball nut (30) and installs them in the brake ball nut bearing housing (27) through the bearing cap (36).

3. The multi-condition loading test device for ball screw pairs as described in claim 2, characterized in that, During the loading test, the required load F of the ball screw pair consisting of the ball screw (7) and the ball nut (8) is converted into the loading torque T by the following formula. Official (1) P h The lead of the loaded ball screw pair; η: Efficiency of the loaded ball screw pair.

4. The multi-condition loading test device for ball screw pairs as described in claim 3, characterized in that, During the test, the load F is converted into the load torque T by formula (1) and the load torque is preset for the brake servo motor (34). The torque sensor (16) feeds back the actual load torque to the brake servo motor (34) to form a closed-loop feedback system. The drive servo motor (1) drives the ball screw pair consisting of the ball screw (7) and the ball nut (8) to perform linear motion according to the motion mode set by the speed (v) - time (t) curve, so as to realize the loading test under the set working conditions. Similarly, by setting any different loading load F and any speed (v)-time (t) curve, loading tests under any working condition can be achieved.

5. The multi-condition loading test device for ball screw pairs as described in claim 4, characterized in that, The dynamic load of the loading ball screw pair consisting of the loading ball nut (11) and the loading ball screw (12) is 5 times that of the ball screw pair consisting of the ball screw (7) and the ball nut (8) to be tested.

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