High-speed roller screw testing device

Abstract

A high-speed roller screw testing device comprises a lathe bed, a power assembly for providing power for a roller screw is arranged on the lathe bed, the end portion of the roller screw is connected with a screw nut, the end portion of the screw nut is connected with a loading mechanism for providing load for the roller screw, and a connecting mechanism is arranged between the roller screw and the loading mechanism. The power assembly comprises a power motor and a diaphragm coupling arranged on a roller screw. Compared with the prior art, the brake and the loading roller screw in the loading mechanism are used for providing load for the roller screw, and the pneumatic control system is used for adjusting the air pressure of the brake, so that the accurate control of the loading torque is realized, the roller screw realizes passive loading, the response speed is high, and the loading precision is high. According to the utility model, positive and negative rotation loading force loading of the roller screw can be rapidly realized, and meanwhile, the diaphragm coupling can provide gapless transmission and is gapless and impact-free during reverse loading, so that continuous positive and negative rotation testing is realized, the testing efficiency is improved, and the labor cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical testing equipment, and in particular to a high-speed roller screw testing device. Background Art

[0002] The roller screw is a high-precision, high-efficiency mechanical transmission device. Its working principle and structural characteristics make it widely used in many fields. The working principle of the roller screw is to drive the nut to make linear motion by the rotation of the screw and the roller. When the screw rotates, the roller will make linear motion along the axis of the screw through the threaded meshing between the screw and the roller, and will make planetary motion between the screw and the nut. The nut has no relative axial displacement with the roller through the cage, so the nut and the roller maintain the same axial movement speed. This transmission method greatly increases the contact surface and force surface of the screw transmission process, and improves the transmission efficiency and stability. Due to its high precision, reversibility and high efficiency, it is widely used in high-precision and high-load transmission systems such as CNC machine tools, automation equipment, precision instruments and aerospace.

[0003] Chinese patent application number 201710014954.1 discloses a planetary roller screw comprehensive performance test platform. The above-mentioned disclosed test platform includes a cast iron platform, an AC servo motor, a planetary reducer, an elastic coupling, a torque sensor, a rotary encoder, a linear guide, a moving platform, three bearing columns, a tension and pressure sensor and a hydraulic cylinder. The AC servo motor, the planetary reducer, the elastic coupling, the torque sensor, the rotary encoder, the moving platform, the tension and pressure sensor, and the hydraulic cylinder are arranged on the upper surface of the cast iron platform from left to right. The AC servo motor is connected to the planetary speedometer, and the planetary speedometer is connected to the torque sensor through an elastic coupling. A Chinese patent with application number 202010393089.8 discloses a testing device for a 15t planetary roller screw. The above-mentioned testing device includes a base, a movable slide, a clamping device, a tension and compression sensor group, a braking device and a screw to be tested; the movable slide, the clamping device, the tension and compression sensor group, and the braking device are all arranged on the upper surface of the base; the screw to be tested is axially arranged horizontally in the clamping device; the screw to be tested is placed axially along the long side direction of the base; and the movable slide, the clamping device, the tension and compression sensor group, and the braking device are placed in sequence along the axial direction of the screw to be tested; the output end of the movable slide is connected to the screw to be tested; one axial end of the screw to be tested is fixedly mounted on the clamping device; one end of the clamping device is connected to one end of the tension and compression sensor group; the other end of the tension and compression sensor group is connected to the braking device.

[0004] The above-mentioned prior art disclosed herein uses devices such as an AC servo motor, a planetary reducer, an elastic coupling, a torque sensor, a rotary encoder, a linear guide, a moving platform, three load-bearing columns, a tension and pressure sensor, and a hydraulic cylinder to test the roller screw. However, when the existing testing device tests the roller screw, there is a tooth gap in the transmission structure, and there is an impact when switching between forward and reverse rotations. Continuous forward and reverse rotation testing cannot be achieved, and the machine needs to be stopped to eliminate the tooth gap when switching the rotation direction, resulting in low test efficiency and high labor costs. At the same time, the dynamic response capability is limited, and it is difficult for the loading device to take into account both long-term loading and stable loading during rapid forward and reverse rotation, and it cannot quickly adapt to the testing requirements of high-speed roller screws. Summary of the invention

[0005] The present invention aims to overcome the defects in the above-mentioned prior art and provide a high-speed roller screw testing device with simple structure, fast response speed and capable of achieving efficient forward and reverse rotation.

[0006] In order to achieve the above-mentioned invention objectives, the present invention adopts the following technical solutions: a high-speed roller screw testing device, including a bed, the bed is provided with a power assembly for providing power to the roller screw, the end of the roller screw is connected with a screw nut, the end of the screw nut is connected with a loading mechanism for providing load to the roller screw, and a connecting mechanism is provided between the roller screw and the loading mechanism; the power assembly includes a power motor and a diaphragm coupling arranged on the roller screw, the loading mechanism includes a pneumatic control system, a brake and a loading roller screw connected to the brake, and the loading roller screw is connected with a loading nut.

[0007] As a preferred solution of the present invention, the bed is provided with a first slide rail arranged along the length direction of the bed, the first slide rail is slidably connected to a motor seat, and the power motor is arranged on the motor seat.

[0008] As a preferred solution of the present invention, the power assembly further comprises a mounting seat for mounting the diaphragm coupling, a bearing is provided on the mounting seat, and the diaphragm coupling is connected to the inner wall of the bearing.

[0009] As a preferred solution of the present invention, the screw nut is threadedly connected to the roller screw, and an auxiliary mechanism for improving the stability of the screw nut is connected to the screw nut, and the auxiliary mechanism moves synchronously with the screw nut.

[0010] As a preferred solution of the present invention, the bed is provided with a second slide rail for connecting the auxiliary mechanism, and the second slide rail is arranged along the moving direction of the auxiliary mechanism.

[0011] As a preferred solution of the present invention, the auxiliary mechanism includes a moving part for supporting the screw nut and a fastening ring for fastening the screw nut, a groove for placing the screw nut is formed at the upper end of the moving part, the fastening ring is buckled on the moving part, and a fastening bolt for fastening the screw nut is provided on the fastening ring.

[0012] As a preferred solution of the present invention, a sliding block connected to the second slide rail is provided at the bottom of the moving member, a connecting groove is provided on the side of the moving member, and a fastening block connected to the connecting groove is provided at the end of the fastening ring.

[0013] As a preferred solution of the present invention, the loading nut is also provided with an auxiliary mechanism for improving the stability of the loading nut.

[0014] As a preferred solution of the present invention, a rigid coupling is connected to the output end of the brake, and the loading roller screw is connected to the rigid coupling.

[0015] As a preferred solution of the present invention, the connection mechanism includes a cross-axis coupling arranged at the end of the screw nut and a tension and pressure sensor connected to the end of the loading nut, and the cross-axis coupling and the tension and pressure sensor are connected.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The brake and the loading roller screw in the loading mechanism are used to provide load for the roller screw, and the air pressure of the brake is adjusted through the pneumatic control system to achieve precise control of the loading torque, so that the roller screw can be passively loaded, with fast response speed, and can quickly realize the forward and reverse loading of the roller screw. At the same time, the diaphragm coupling can provide gapless transmission, and there is no gap and impact during reverse loading, thereby realizing continuous forward and reverse testing, improving test efficiency, and reducing labor costs;

[0018] 2. Furthermore, by providing an auxiliary mechanism on the lead screw nut and the loading nut, the auxiliary mechanism is slidably connected to the second slide rail, and the auxiliary mechanism and the lead screw nut or the loading nut move synchronously, thereby ensuring the smooth and precise axial movement of the lead screw nut and the loading nut, reducing friction and overturning torque, and improving test accuracy and reliability. At the same time, by providing a fastening bolt on the fastening ring, roller screws of different specifications and models can be fixed, thereby meeting the testing requirements of roller screws of different specifications and models, improving the flexibility of the testing device, and eliminating the need for frequent adjustment of the testing device or replacement of test components, thereby reducing maintenance difficulty and improving testing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the present invention;

[0020] Figure 2 It is a structural schematic diagram of the diaphragm coupling of the present invention;

[0021] Figure 3 It is a structural schematic diagram of the auxiliary mechanism of the present invention;

[0022] Figure 4 It is a structural schematic diagram of the pneumatic control system of the present invention.

[0023] Figure markings: bed 1, first slide rail 101, second slide rail 102, power assembly 2, power motor 201, motor seat 2011, mounting seat 202, diaphragm coupling 2021, bearing 2022, torque sensor 203, roller screw 3, screw nut 301, auxiliary mechanism 4, moving part 401, slider 4011, groove 4012, connecting groove 4013, fastening ring 402, fastening block 4021, fastening bolt 403, connecting mechanism 5, cross-axis coupling 501, tension and pressure sensor 502, loading mechanism 6, brake 601, rigid coupling 602, loading roller screw 603, loading nut 6031, pneumatic control system 604, air source 6041, two-piece 6042, pressure regulating valve 6043, control valve 6044, actuator 6045. DETAILED DESCRIPTION

[0024] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0025] like Figure 1-Figure 4 As shown, a high-speed roller screw testing device includes a bed 1, on which is disposed a power assembly 2 for providing power to a roller screw 3, a screw nut 301 is connected to the end of the roller screw 3, a loading mechanism 6 for providing load to the roller screw 3 is connected to the end of the screw nut 301, a connecting mechanism 5 is provided between the roller screw 3 and the loading mechanism 6; the power assembly 2 includes a power motor 201 and a diaphragm coupling 2021 arranged on the roller screw 3, the loading mechanism 6 includes a pneumatic control system 604, a brake 601 and a loading roller screw 603 connected to the brake 601, and the loading roller screw 603 is connected to a loading nut 6031.

[0026] Furthermore, the power motor 201, the diaphragm coupling 2021, the roller screw 3, the screw nut 301, the connecting mechanism 5, the loading roller screw 603, the loading nut 6031 and the brake 601 are coaxially arranged, that is, the entire test device adopts a series layout to ensure the alignment and consistency of each component during the test process, reduce the error caused by the eccentric load, and improve the reliability of the test results.

[0027] The diaphragm coupling 2021 is arranged on the output end of the power motor 201, and the end of the roller screw 3 is connected to the diaphragm coupling 2021. The diaphragm coupling 2021 can provide gapless transmission, and there is no gap and impact when reverse loading. Specifically, the diaphragm coupling 2021 is composed of several groups of diaphragms (usually stainless steel sheets) connected to two half couplings by bolts. Each group of diaphragms is composed of several stacked pieces, and the diaphragms are divided into connecting rod type and whole piece type of different shapes. In addition, the diaphragm coupling 2021 also includes components such as sleeves. Working principle of diaphragm coupling 2021: Diaphragm coupling 2021 relies on the elastic deformation of the diaphragm to compensate for the relative displacement of the two connected shafts, including axial, radial and angular offsets. When there is a deviation between the two shafts, the diaphragm will undergo elastic deformation to absorb and compensate for these deviations, thereby ensuring the stability and accuracy of the transmission.

[0028] The brake 601 in the loading mechanism 6 is a disc brake, which applies a load to the roller screw 3 through friction. In addition, the pneumatic control system 604 adjusts the air pressure of the brake 601 to achieve precise control of the loading torque.

[0029] The pneumatic control system 604 includes an air source 6041, a two-piece connection 6042, a pressure regulating valve 6043, a control valve 6044 and an actuator 6045, which can quickly respond to load changes and provide precise torque regulation. By adjusting the air pressure of the brake 601, the loading mechanism 6 can simulate different workloads and test the performance of the roller screw 3 under various load conditions.

[0030] The bed 1 is provided with a first slide rail 101 arranged along the length direction of the bed 1, and a motor seat 2011 is slidably connected to the first slide rail 101, and the power motor 201 is arranged on the motor seat 2011. Furthermore, the first slide rail 101 is arranged at the end of the bed 1, and the power motor 201 is slidably connected to the first slide rail 101 through the motor seat 2011.

[0031] The power assembly 2 also includes a mounting seat 202 for mounting a diaphragm coupling 2021, a bearing 2022 being provided on the mounting seat 202, and the diaphragm coupling 2021 is connected to the inner wall of the bearing 2022. Furthermore, the mounting seat 202 is used to support and fix the roller screw 3. The mounting seat 202 is installed on the bed 1, and a bearing 2022 for supporting the roller screw 3 is provided in the mounting seat 202, which is used to bear axial loads and ensure that the roller screw 3 remains stable during high-speed rotation. At the same time, the diaphragm coupling 2021 is installed in the inner ring of the bearing 2022, and the roller screw 3 is connected to the diaphragm coupling 2021.

[0032] The screw nut 301 is threadedly connected to the roller screw 3, and an auxiliary mechanism 4 for improving the stability of the screw nut 301 is connected to the screw nut 301, and the auxiliary mechanism 4 moves synchronously with the screw nut 301. Furthermore, a second slide rail 102 for connecting the auxiliary mechanism 4 is provided on the bed 1, and the second slide rail 102 is arranged along the moving direction of the auxiliary mechanism 4. The auxiliary mechanism 4 is fixedly set at the end of the screw nut 301, and the auxiliary mechanism 4 is slidably connected to the second slide rail 102 through the auxiliary mechanism 4 set on the screw nut 301. The auxiliary mechanism 4 and the screw nut 301 move synchronously, ensuring the smooth and precise axial movement of the screw nut 301, reducing friction and overturning torque, and improving test accuracy and reliability.

[0033] Specifically, the auxiliary mechanism 4 includes a moving part 401 for supporting the screw nut 301 and a fastening ring 402 for fastening the screw nut 301. A groove 4012 for placing the screw nut 301 is formed at the upper end of the moving part 401. The fastening ring 402 is buckled on the moving part 401. A fastening bolt 403 for fastening the screw nut 301 is provided on the fastening ring 402. Further, the groove 4012 is arranged at the top of the moving part 401, and the groove 4012 is arranged along the length direction of the screw nut 301, and the groove 4012 is a V-shaped structure. The screw nut 301 is arranged in the groove 4012. In addition, the fastening ring 402 is a semicircular ring-shaped mechanism. The fastening The ring 402 is buckled on the moving part 401, and the screw nut 301 is located between the moving part 401 and the fastening ring 402. A fastening bolt 403 is arranged on the top of the fastening ring 402. The end of the fastening bolt 403 passes through the fastening ring 402 and abuts against the screw nut 301. The fastening degree of the screw nut 301 can be achieved by adjusting the fastening bolt 403. The roller screw 3 of different specifications and models can be fixed by adjusting the fastening bolt 403, thereby realizing the testing requirements of roller screws 3 of different specifications and models, improving the flexibility of the testing device, and eliminating the need to frequently adjust the testing device or replace the testing components, thereby reducing the maintenance difficulty and improving the testing efficiency.

[0034] A slider 4011 connected to the second slide rail 102 is provided at the bottom of the movable member 401, and a connecting groove 4013 is provided on the side of the movable member 401, and a fastening block 4021 connected to the connecting groove 4013 is provided at the end of the fastening ring 402. Furthermore, the movable member 401 is slidably connected to the second slide rail 102 through the slider 4011. In addition, the connecting grooves 4013 are arranged on opposite sides of the movable member 401, and the connecting grooves 4013 are arranged along the length direction of the movable member 401. Fastening blocks 4021 are arranged at both ends of the fastening ring 402, and the fastening blocks 4021 are buckled in the connecting grooves 4013, thereby realizing the connection of the fastening ring 402 of the movable member 401, and ensuring the connection stability between the auxiliary mechanism 4 and the screw nut 301.

[0035] The loading nut 6031 is also provided with an auxiliary mechanism 4 for improving the stability of the loading nut 6031. The connection method between the auxiliary mechanism 4 and the loading nut 6031 is the same as the connection method between the auxiliary mechanism 4 and the screw nut 301 mentioned above. It is also used to improve the smoothness and precision of the axial movement of the loading nut 6031, reduce friction and overturning torque, and improve test accuracy and reliability. The specific connection method will not be repeated here.

[0036] A rigid coupling 602 is connected to the output end of the brake 601, and a loading roller screw 603 is connected to the rigid coupling 602. Furthermore, the brake 601, the rigid coupling 602 and the loading roller screw 603 are coaxially arranged. The rigid coupling 602 is a device that connects two shafts and allows them to rotate at the same speed and angle, and is characterized by high rigidity and direct torque transmission capacity. The structure of the rigid coupling is relatively simple, usually consisting of two metal half-couplings, which are connected together by bolts, pins or other fastening devices. They can directly cooperate with the end face or shaft hole of the shaft to transmit torque and rotational motion. When two shafts are connected by a rigid coupling, they will keep rotating synchronously, and the torque is directly transmitted from one shaft to another shaft through the connecting part of the coupling. The rigid coupling transmits large and stable torque, and the cost is low.

[0037] The connecting mechanism 5 includes a cross-axis coupling 501 arranged at the end of the screw nut 301 and a tension and pressure sensor 502 connected to the end of the loading nut 6031. The cross-axis coupling 501 and the tension and pressure sensor 502 are connected. The tension and pressure of the roller screw 3 during the test are detected by the tension and pressure sensor 502. In addition, the cross-axis coupling 501 is mainly used to connect two transmission shafts with different axes so that they can transmit torque and motion at a certain angle. The cross-axis coupling is mainly composed of two universal joint forks, a cross shaft, a needle bearing, an oil seal, and a sleeve. Among them, the two universal joint forks are respectively installed on the two transmission shafts and connected by a cross shaft. The four shaft heads of the cross shaft are respectively equipped with needle bearings, which can rotate flexibly in the hole of the universal joint fork, thereby realizing the transmission of the angle deviation between the two shafts. When there is an angle between the two transmission shafts, the cross-axis coupling can adapt to this angle deviation through the relative movement of the needle bearings and the cross shaft inside it. In the process of transmitting torque, the universal joint fork will swing around the central axis of the cross shaft, and the needle bearing will roll in the hole of the universal joint fork, thereby realizing continuous transmission of torque.

[0038] Specific working principle:

[0039] When the roller screw 3 needs to be tested, the brake 601 and the external power supply current input terminal of the power motor 201 are turned on, and the roller screw 3 is driven to rotate through the diaphragm coupling 2021, and the screw nut 301 drives the auxiliary mechanism 4 to move along the second slide rail 102 in the direction of the second slide rail 102. At this time, the loaded roller screw 603 is subjected to the loading torque of the brake 601 through the rigid coupling 602, and the loading nut 6031 of the loaded roller screw 603 transmits the loading force to the screw nut 301 of the roller screw 3 through the tension pressure sensor 502 and the cross-axis coupling 501. The air pressure of the disc brake 601 is adjusted through the pneumatic control system 604 to achieve accurate loading of the roller screw 3. By adjusting the air pressure of the brake 601, different workloads are simulated to test the performance of the roller screw 3 under various load conditions.

[0040] A torque sensor 203 is attached to the output shaft of the power motor 201 for real-time monitoring and recording of the output torque of the power motor 201 .

[0041] In this embodiment, the bed 1 is an integral casting structure with high rigidity and deformation resistance, and is adapted to working stress under high load and high speed. The second slide rail 102 is arranged on the bed 1 along the displacement direction of the lead screw nut 301, and the slider 4011 at the bottom of the moving part 401 matches the second slide rail 102 to ensure the smooth and accurate axial movement of the lead screw nut 301, reduce friction and overturning torque, and improve test accuracy and reliability. A power cord is fixedly connected to the right side of the bed 1, and the power motor 201 is electrically connected to the power cord through a switch.

[0042] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention; therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0043] Although this article uses more of the figure markings: bed 1, first slide rail 101, second slide rail 102, power assembly 2, power motor 201, motor seat 2011, mounting seat 202, diaphragm coupling 2021, bearing 2022, torque sensor 203, roller screw 3, screw nut 301, auxiliary mechanism 4, moving part 401, slider 4011, groove 4012, connecting groove 4013, fastening ring 402, fastening block 4021, fastening bolt 403, connecting mechanism 5, cross-axis coupling 501, tension and pressure sensor 502, loading mechanism 6, brake 601, rigid coupling 602, loading roller screw 603, loading nut 6031, pneumatic control system 604, air source 6041, two-piece 6042, pressure regulating valve 6043, control valve 6044, actuator 6045 and other terms, the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; any additional limitations interpreted as them are contrary to the spirit of the present invention.

Claims

1. A high-speed roller screw testing device, comprising a bed (1), characterized in that: The bed (1) is provided with a power assembly (2) for providing power to the roller screw (3); the end of the roller screw (3) is connected to a screw nut (301); the end of the screw nut (301) is connected to a loading mechanism (6) for providing load to the roller screw (3); a connecting mechanism (5) is provided between the roller screw (3) and the loading mechanism (6); the power assembly (2) comprises a power motor (201) and a diaphragm coupling (2021) arranged on the roller screw (3); the loading mechanism (6) comprises a pneumatic control system (604), a brake (601) and a loading roller screw (603) connected to the brake (601); the loading roller screw (603) is connected to a loading nut (6031).

2. A high-speed roller screw testing device according to claim 1, characterized in that: The bed body (1) is provided with a first slide rail (101) arranged along the length direction of the bed body (1), a motor seat (2011) is slidably connected to the first slide rail (101), and the power motor (201) is arranged on the motor seat (2011).

3. A high-speed roller screw testing device according to claim 1, characterized in that: The power assembly (2) further comprises a mounting seat (202) for mounting the diaphragm coupling (2021), a bearing (2022) being provided on the mounting seat (202), and the diaphragm coupling (2021) is connected to the inner wall of the bearing (2022).

4. A high-speed roller screw testing device according to claim 1, characterized in that: The lead screw nut (301) is threadedly connected to the roller screw (3); an auxiliary mechanism (4) for improving the stability of the lead screw nut (301) is connected to the lead screw nut (301); the auxiliary mechanism (4) moves synchronously with the lead screw nut (301).

5. A high-speed roller screw testing device according to claim 4, characterized in that: The bed (1) is provided with a second slide rail (102) for connecting the auxiliary mechanism (4), and the second slide rail (102) is arranged along the moving direction of the auxiliary mechanism (4).

6. A high-speed roller screw testing device according to claim 5, characterized in that: The auxiliary mechanism (4) comprises a moving part (401) for supporting a lead screw nut (301) and a fastening ring (402) for fastening the lead screw nut (301); a groove (4012) for accommodating the lead screw nut (301) is formed at the upper end of the moving part (401); the fastening ring (402) is buckled on the moving part (401); and a fastening bolt (403) for fastening the lead screw nut (301) is provided on the fastening ring (402).

7. A high-speed roller screw testing device according to claim 6, characterized in that: A sliding block (4011) connected to the second slide rail (102) is provided at the bottom of the moving member (401), a connecting groove (4013) is provided on the side of the moving member (401), and a fastening block (4021) connected to the connecting groove (4013) is provided at the end of the fastening ring (402).

8. A high-speed roller screw testing device according to claim 4, characterized in that: The loading nut (6031) is also provided with an auxiliary mechanism (4) for improving the stability of the loading nut (6031).

9. A high-speed roller screw testing device according to claim 1, characterized in that: The output end of the brake (601) is connected to a rigid coupling (602), and the loading roller screw (603) is connected to the rigid coupling (602).

10. A high-speed roller screw testing device according to claim 1, characterized in that: The connection mechanism (5) comprises a cross-axis coupling (501) arranged at the end of the lead screw nut (301) and a tension and pressure sensor (502) connected to the end of the loading nut (6031); the cross-axis coupling (501) and the tension and pressure sensor (502) are connected.

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