A high-speed planetary roller screw performance running-in device

Abstract

The present invention relates to a high-speed planetary roller screw performance running-in device, including a machine platform for installing a ball screw drive assembly and a linear guide pair; the ball screw drive assembly is connected to an upper top assembly and is used to drive the upper top assembly to move; the upper top assembly is connected to the linear guide pair and the ball screw drive assembly on the machine platform, and is driven by the ball screw drive assembly to make linear motion along the linear guide pair; the lower top assembly cooperates with the upper top assembly to install the tested planetary roller screw pair, and is used to drive the tested planetary roller screw to rotate and adjust the speed of the rotation; the follow-up loading assembly is connected to the nut of the tested planetary roller screw, and can move up and down with the nut on the tested planetary roller screw pair, and is used to perform follow-up loading on the tested planetary roller screw pair. The present invention loads on the tested nut to simulate the actual working conditions, and improves the accuracy, load capacity and service life through up and down running-in movements.

Description

Technical Field

[0001] The invention relates to a high-speed planetary roller screw, in particular to a planetary roller screw pair running-in device. Background Art

[0002] With the advancement of modern science and technology and the continuous development of mechanical processing technology, high-speed precision CNC machine tools with high cutting speed, high feed speed, high processing accuracy and other characteristics are the technology and development direction of the equipment manufacturing industry, and are a strategic industry of the equipment manufacturing industry. High-speed precision CNC machine tools not only have extremely high production efficiency, but also can significantly improve the processing accuracy and surface quality of parts. The working performance of high-speed precision CNC machine tools depends first on the operating performance of high-speed screws.

[0003] The planetary roller screw pair is composed of a screw, a nut and a roller, an inner gear ring, and a planet carrier. Its function is to convert rotational motion into linear motion, which is a further extension and development of the trapezoidal screw. The important significance of this development is to transform the sliding motion of the trapezoidal screw into a transmission mechanism for the roller. After the thread of the roller screw pair is run-in, its surface is smooth and slightly hardened, which can increase the load and service life of the thread. Due to its small friction resistance, the planetary roller screw pair is widely used in various industrial equipment and precision instruments. At present, due to the processing errors of the rollers and screws in the manufacturing process, it is easy to cause excessive wear of the rollers and screws when they run at high speed, thereby affecting the transmission accuracy of the roller screw. On the other hand, since most of the users directly install and use the screw pair after purchasing it, without conducting a trial run of the roller screw pair, the equipment is repaired due to excessive wear of the rollers.

[0004] At present, the main by-products of planetary roller screws in China are:

[0005] 1. Insufficient transmission efficiency; 2. Low transmission accuracy; 3. Short service life.

[0006] In view of these technical difficulties, in order to promote the continuous improvement of the quality of domestic planetary roller screw pairs, it is necessary to provide a high-speed planetary roller screw performance running-in device to run-in the threads in the screw pair. Its main purpose is to verify the various technical performance of the product, which is an important guarantee for delivering qualified products to users. Products that have undergone rigorous testing have rich product technical performance test data, which can enhance users' confidence in selecting products. Testing equipment helps to improve product technical performance and is an important support for product iteration and optimization. Establishing complete testing equipment can effectively establish an industry benchmark and form a competitive advantage.

[0007] The existing horizontal running-in machine uses a single screw for running-in, which has low running-in efficiency, obvious vibration when running-in a long screw pair, large deflection, and inaccurate test data. Therefore, in order to solve the above problems, it is necessary to design a high-speed planetary roller screw performance running-in device, which runs the finished screw pair through the running-in device to improve the load and service life of the screw pair thread. Summary of the invention

[0008] The present invention is to provide a high-speed planetary roller screw performance running-in device, which is mainly used for the running-in movement of the nut and the screw in the planetary roller screw pair (it can also be used for the running-in movement of other screw pairs), and the load can be increased as needed.

[0009] To achieve the above object, the technical solution of the present invention is: a high-speed planetary roller screw performance running-in device, comprising:

[0010] Machine table, used to install ball screw drive assembly and linear guide pair;

[0011] A ball screw drive assembly is connected to the upper center assembly and is used to drive the upper center assembly to move;

[0012] The upper center assembly is connected to the linear guide pair and the ball screw drive assembly on the machine platform, and is driven by the ball screw drive assembly to move linearly along the linear guide pair;

[0013] The lower center assembly cooperates with the upper center assembly to install the tested planetary roller screw pair, and is used to drive the planetary roller screw in the tested planetary roller screw pair to rotate and adjust the speed of the planetary roller screw;

[0014] The follow-up loading assembly is connected to the nut on the planetary roller screw pair under test, and can move up and down following the nut on the planetary roller screw pair under test, and is used for follow-up loading of the planetary roller screw pair under test, and adjusting the load size according to the working conditions.

[0015] Furthermore, the machine platform includes a frame, a linear guide pair, a guide rail pressure block, a ball screw mounting seat, and a guide rail stopper. The linear guide pair is installed on the frame through the guide rail pressure block, and a ball screw mounting seat is provided.

[0016] Furthermore, the ball screw drive assembly includes a motor M, a reducer, a ball screw pair (ball screw, ball screw nut), two bearing seats, bearings, and a nut seat. The motor M and the reducer are connected to the ball screw in the ball screw pair through a coupling. The ball screw in the ball screw pair is connected to the nut seat through the ball screw nut, and the nut seat is connected to the upper top assembly.

[0017] Furthermore, the bearing seat is equipped with a bearing and an end cover, and is connected to the machine platform.

[0018] Furthermore, the upper center point assembly includes an upper seat, a middle seat, an upper center point, coarse and fine adjustment screws, a compression spring, a fine adjustment screw, a long handle, a slide plate, and a slider. The upper seat and the middle seat are connected by bolts, and the upper center point is installed on the upper seat. A compression spring is installed in the upper seat, and the compression spring is connected to the coarse and fine adjustment screws on the upper seat. The extension amount of the upper center point can be adjusted by the coarse and fine adjustment screws and the compression spring; the upper seat and the upper center point are fastened by a small handle; a long handle is installed on the side of the upper seat, and the long handle controls the extension amount of the upper center point. The middle seat is connected to a slider that can slide on the machine through a slide plate.

[0019] Furthermore, the upper center is installed on the lower end of the upper seat through a round nut. When the upper center is replaced, the round nut pushes the upper center out; a fine-tuning screw is provided on the middle seat, and the fine-tuning amount of the upper center is adjusted by the fine-tuning screw.

[0020] Furthermore, the lower center assembly includes a motor M, a continuously variable speed reducer, a coupling, a main shaft, a base, an upper bearing seat, a lower bearing seat, a thrust ball bearing, a ball bearing, a T-slot flange, and a lower center. The motor M and the continuously variable speed reducer are connected to the main shaft through a coupling, a thrust ball bearing is installed in the lower bearing seat, and is installed on the base; a ball bearing is installed in the upper bearing seat, and the ball bearing is pressed with a pressure cover; the T-slot flange and the lower center are installed on the main shaft.

[0021] Furthermore, the follow-up loading assembly includes a bearing seat, a linear ball bearing, a shaft retaining ring, a guide rod, a locking ring, a bumper rod, a loading slider, a screw, and a loading block. A linear ball bearing and a shaft retaining ring are installed in the bearing seat, and pressure covers are installed at both ends and installed on the guide rod. The bearing seat is connected to the upper top assembly through screws, and the loading slider is slidably connected on the guide rod. The loading slider is connected to the loading block through a screw. The loading block and the bumper rod follow the guide rod, and the loading block is fixedly connected to the planetary roller screw pair under test.

[0022] Furthermore, two proximity switches are respectively installed on the guide rod through two proximity switch seats, and the two proximity switches are respectively arranged at upper and lower extreme positions.

[0023] Furthermore, locking rings are respectively provided on the two glands, and the locking rings press the glands tightly through the screws thereon, thereby playing the role of locking the glands.

[0024] The beneficial effects of the present invention are:

[0025] The invention provides a nut and screw running-in device in a planetary roller screw pair, which loads the nut to simulate actual working conditions and improves accuracy, load-bearing capacity and service life through up and down running-in movements.

[0026] This device consists of a frame, a ball screw drive assembly, an upper center assembly, a lower (drive) center assembly, a follow-up loading assembly, an operating box, and an electrical control system. The main purpose of this test equipment is to improve the technical performance of planetary roller screw products, and it is an important guarantee for delivering qualified products to users. Products that have undergone rigorous testing have a wealth of product technical performance test data, which can enhance user confidence in selecting products. Test equipment helps to improve product technical performance and is an important support for product iteration and optimization. Establishing a complete test equipment can effectively establish an industry benchmark and form a competitive advantage. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural side view of the high-speed planetary roller screw performance running-in device of the present invention;

[0028] Figure 2 It is a structural front view of the high-speed planetary roller screw performance running-in device of the present invention;

[0029] Figure 3 It is a schematic diagram of the machine structure of the present invention;

[0030] Figure 4 It is a schematic structural diagram of the ball screw drive mechanism of the present invention;

[0031] Figure 5 It is a schematic diagram of the structure of the upper top assembly of the present invention;

[0032] Figure 6 It is a schematic diagram of the structure of the lower top assembly of the present invention;

[0033] Figure 7 It is a schematic diagram of the structure of the follower loading assembly of the present invention. DETAILED DESCRIPTION

[0034] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0035] like Figures 1 to 7 As shown, the high-speed planetary roller screw performance running-in device of the present invention is composed of a machine platform 100, a ball screw drive assembly 200, an upper center assembly 300, a lower center (main drive) assembly 400, a follow-up loading assembly 500, an operating box, and an electrical control.

[0036] A ball screw drive assembly 200 is installed on the machine 100, and an upper center assembly 300 and a lower center (main drive) assembly 400 are arranged on the side. The upper center assembly 300 is connected to the slider in the linear guide pair on the machine, and is connected to the ball screw drive assembly 200, and is driven by the ball screw drive assembly 200 to move along the linear guide on the machine. The test piece (planetary roller screw pair) is installed between the upper center assembly 300 and the lower center (main drive) assembly 400, and the active center on the lower center (main drive) assembly 400 drives the test piece (planetary roller screw pair) to rotate through a dial, and the speed is adjustable. The loading block on the follower loading assembly is connected to the nut of the test piece (planetary roller screw pair), and the load size can be added or subtracted according to the working conditions, and slides up and down along the guide rod as it rotates, and the two extreme positions are controlled by photoelectric switches.

[0037] like Figure 3 As shown, the machine platform 100 is composed of a frame 1, a linear guide pair 2, a guide rail pressing block 3, a ball screw mounting seat 4, and a guide rail stopper 5. The linear guide pair 2 is mounted on the frame 1 through the guide rail pressing block 3, and a ball screw mounting seat 4 is provided.

[0038] like Figure 4 As shown, the ball screw drive assembly 200 includes a motor M1, a reducer 6, a ball screw pair (ball screw 14, ball screw nut 9), bearing seats A, B12, 15, bearings 11, end covers A, B8, 10, and a nut seat 13. The motor M1 is connected to the reducer 6, and the reducer 6 is connected to the ball screw pair through a coupling 7. The bearing seats A, B12, 15 are equipped with bearings 11, and the end covers A, B8, 10 are connected to the machine 100 respectively. The ball screw nut 9 is connected to the upper top assembly 300 through the nut seat 13.

[0039] like Figure 5 As shown, the upper center assembly 300 is composed of an upper seat 17, a middle seat 26, an upper center 16, a small handle 18, a coarse and fine adjustment screw 20, a compression spring 19, a fine adjustment screw 22, a long handle 21, a slide plate 25, a slider 23, a bolt 24, and a round nut 27. The bolt 24 connects the upper seat 17 with the middle seat 26, and the upper center 16 is installed on the lower end of the upper seat 17 through the round nut 27. When the upper center 16 is replaced, it can be pushed out by the round nut 27. The upper seat 17 is equipped with a compression spring 19, which is connected to the coarse and fine adjustment screw 20 on the upper seat 17. The extension amount of the upper center 16 can be adjusted by the coarse and fine adjustment screw 20 and the compression spring 19. The upper seat 17 and the upper center 16 are fastened by the small handle 18. A long handle 21 is provided on the side of the upper seat 17, and the long handle 21 controls the extension amount of the upper center 16. A fine adjustment screw 22 is provided on the middle seat 26, and the fine adjustment amount of the upper center 16 can be adjusted by the fine adjustment screw 22. The middle seat 26 is connected to a slider 23 that can slide on the machine platform 100 through a slide plate 25.

[0040] like Figure 6 As shown, the lower center (main drive) assembly 400 is composed of a motor M2, a continuously variable speed reducer 35, a reducer mounting seat 36, a coupling 33, a main shaft 43, a base 31, an upper bearing seat 40, a lower bearing seat 42, a thrust ball bearing 41, a pressure cover 39, a ball bearing 30, a T-slot flange 29, a lower center 28, and a round nut 38. The motor M2 and the continuously variable speed reducer 35 are connected to the main shaft 43 through the coupling 33. The thrust ball bearing 41 is installed in the lower bearing seat 42 and is installed on the base 31. The ball bearing 30 is installed in the upper bearing seat 40 and is pressed by the pressure cover 39. The T-slot flange 29 and the lower center 28 are installed on the main shaft 43. The round nut 38 is used to disassemble the lower center 28. The test piece-planetary roller screw pair 37 is installed on the lower center 28.

[0041] like Figure 7 As shown, the follow-up loading assembly 500 is composed of a bearing seat 57, a linear ball bearing 47, a shaft retaining ring 48, a gland A, B46, 49, a guide rod 45, a screw 58, a locking ring A, B50, 55, a proximity switch seat A, B54, 60, a proximity switch A, B51, 63, a bracket 53, a touch rod 52, a loading slider 61, a screw 62, and a loading block 65. The linear ball bearing 47 and the shaft retaining ring 48 are installed in the bearing seat 57, and glands A, B46, 49 are installed at both ends and installed on the guide rod 45. The bearing seat 57 is connected to the upper top assembly 300 by screws 58. The locking rings A, B50, 55 respectively press the glands A, B46, 49 with the screws thereon to play a locking role of the device. The proximity switch seats A, B54, 60 are respectively installed with proximity switches A, B51, 63 through the bracket 53, and the proximity switches A, B51, 63 are at the upper and lower limit positions. The loading slider 61 is connected to the loading block 65 through the screw 62, and the loading block 65 and the contact rod 52 follow the guide rod 45. The test piece-planetary roller screw pair 37 is fixedly connected to the loading block 65.

[0042] The main functions and technical parameters of the high-speed planetary roller screw performance running-in device of the present invention are as follows:

[0043] 1. Function

[0044] (1) The nut and the screw in the planetary roller screw pair run in, the screw rotates, the nut rises and falls, and loads can be added.

[0045] (2) Grinding the center hole of shaft parts: When the ordinary center is replaced with a slotted strong center and fine grinding sand is added, the center hole of shaft parts can be ground.

[0046] 2. Main technical parameters

[0047] (1) Maximum lifting stroke: 1200mm (distance between two centers)

[0048] (2) Maximum lifting speed: 500mm / min

[0049] (3) Top center assembly: moving load 200kg, moving distance along the polished rod 1200mm, with locking mechanism, up and down movement is automatically controlled. The top center has a locking mechanism and can be fine-tuned.

[0050] (4) Lower center (main drive) assembly: spindle speed 50~450r / min, rated power 0.55Kw, continuously variable speed reducer + primary reducer (1:2), output torque 9.5~19N.M, which can meet the running-in stroke requirements of the screw pitch from 0.5~10mm.

Claims

1. A high-speed planetary roller screw performance running-in device, characterized in that: include: Machine table, used to install ball screw drive assembly and linear guide pair; A ball screw drive assembly is connected to the upper top assembly and is used to drive the upper top assembly to move; the ball screw drive assembly includes a motor M, a reducer, a ball screw pair, two bearing seats, a bearing, and a nut seat. The motor M and the reducer are connected to the ball screw in the ball screw pair through a coupling. The ball screw is connected to the nut seat through a ball screw nut, and the nut seat is connected to the upper top assembly; The upper center assembly is connected to the linear guide pair and the ball screw drive assembly on the machine platform, and is driven by the ball screw drive assembly to make linear motion along the linear guide pair; the upper center assembly includes an upper seat, a middle seat, an upper center, a coarse and fine adjustment screw, a compression spring, a fine adjustment screw, a long handle, a slide plate, and a slider; the upper seat and the middle seat are connected by bolts, the upper center is installed on the upper seat, a compression spring is installed in the upper seat, the compression spring is connected to the coarse and fine adjustment screws on the upper seat, and the extension amount of the upper center can be adjusted by the coarse and fine adjustment screws and the compression spring; the upper seat and the upper center are fastened by a small handle; a long handle is installed on the side of the upper seat, and the long handle controls the extension amount of the upper center, and the middle seat is connected to the slider that can slide on the machine platform through the slide plate; The lower center assembly cooperates with the upper center assembly to install the tested planetary roller screw pair, and is used to drive the planetary roller screw in the tested planetary roller screw pair to rotate, and adjust the speed of the planetary roller screw rotation; the lower center assembly includes a motor M, a continuously variable speed reducer, a coupling, a spindle, a base, an upper bearing seat, a lower bearing seat, a thrust ball bearing, a ball bearing, a T-slot flange, and a lower center; the motor M and the continuously variable speed reducer are connected to the spindle through a coupling, and the thrust ball bearing is installed in the lower bearing seat and installed on the base; the ball bearing is installed in the upper bearing seat, and the ball bearing is pressed by a pressure cover; the T-slot flange and the lower center are installed on the spindle; A follow-up loading component is connected to the nut on the planetary roller screw pair being tested, and can move up and down with the nut on the planetary roller screw pair being tested, and is used to perform follow-up loading on the planetary roller screw pair being tested, and adjust the load size according to the working conditions; the follow-up loading component includes a bearing seat, a linear ball bearing, a shaft retaining ring, a guide rod, a locking ring, a bumper rod, a loading slider, a screw rod, and a loading block. A linear ball bearing and a shaft retaining ring are installed in the bearing seat, and pressure covers are installed at both ends and installed on the guide rod. The bearing seat is connected to the upper top assembly through screws, and the guide rod is slidably connected to the loading slider, and the loading slider is connected to the loading block through a screw rod. The loading block and the bumper rod follow the guide rod, and the loading block is fixedly connected to the planetary roller screw pair being tested.

2. The high-speed planetary roller screw performance running-in device according to claim 1, characterized in that: The machine platform comprises a frame, a linear guide pair, a guide rail pressure block, a ball screw mounting seat, and a guide rail stopper. The linear guide pair is mounted on the frame through the guide rail pressure block, and a ball screw mounting seat is provided.

3. The high-speed planetary roller screw performance running-in device according to claim 1, characterized in that: The bearing seat is provided with a bearing and an end cover and is connected to the machine platform.

4. The high-speed planetary roller screw performance running-in device according to claim 1, characterized in that: The upper center is installed on the lower end of the upper seat through a round nut. When the upper center is replaced, the round nut pushes the upper center out. The middle seat is provided with a fine adjustment screw, and the fine adjustment amount of the center is adjusted by the fine adjustment screw.

5. The high-speed planetary roller screw performance running-in device according to claim 1, characterized in that: Two proximity switches are respectively installed on the guide rod through two proximity switch seats, and the two proximity switches are respectively arranged at upper and lower extreme positions.

6. The high-speed planetary roller screw performance running-in device according to claim 1, characterized in that: The two glands are respectively provided with locking rings, which are pressed against the glands by screws thereon to lock the glands.

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