A precision testing device for planetary roller screw pairs

Abstract

This invention discloses a precision testing device for planetary roller screw pairs, including a testing platform with symmetrically mounted fixed plates on its top. A servo motor is fixedly mounted on one side of one of the fixed plates. The device also includes two sets of support rods symmetrically mounted below the two fixed plates, and a positioning assembly positioned between the two fixed plates. The positioning assembly includes two movable frames and limiting components symmetrically positioned on both sides of the two movable frames. This allows for easy switching between different sized positioning plates when dealing with different types of planetary roller screw pairs, facilitating reliable positioning of the nut or screw according to the type of planetary roller screw pair. Furthermore, after switching, when positioning a reverse planetary roller screw pair, multi-point positioning of the screw in the pair can be quickly achieved, facilitating the movement of the screw in the reverse planetary roller screw pair while preventing rotation during screw movement, thus improving testing accuracy.

Description

Technical Field

[0001] This invention relates to the field of planetary roller screw assembly manufacturing technology, specifically to a precision testing device for planetary roller screw assemblies. Background Technology

[0002] Planetary roller screw pairs are high-precision mechanical transmission mechanisms that convert system input rotational torque into linear thrust, and their basic principle is similar to that of ball screws. Compared to ball screws, which experience force through multi-point contact, planetary roller screw pairs experience force through line contact. This increased contact surface significantly improves the load-bearing capacity and rigidity of the planetary roller screw pair. Furthermore, planetary roller screws offer advantages such as high speed, long service life, and high motion accuracy. These characteristics make planetary roller screw mechanisms an ideal choice for applications requiring harsh working conditions and long-term continuous operation.

[0003] For example, the planetary roller screw pair precision testing device with announcement number CN221506273U, through the setting of a movable support plate and a linear adjustment mechanism, facilitates the clamping and fixing of screws of different lengths. The setting of a first three-jaw chuck and a second three-jaw chuck facilitates the fixing of screws of different diameters. The setting of a limit mechanism facilitates the limiting of nuts of different sizes. Therefore, it can perform precision testing on planetary roller screw pairs of different models. The operation is convenient, quick, and highly practical. However, in actual use, when measuring planetary roller screw pairs, planetary roller screw pairs can be divided into forward planetary roller screw pairs (screw rotation drives nut movement) and reverse planetary roller screw pairs (nut rotation drives screw movement). When testing a reverse planetary roller screw pair, since the screw is located outside the nut, it is mainly moved by the rotation of the screw rod. During the testing process, regardless of whether it is a forward or reverse planetary roller screw pair... Both reverse planetary roller screw pairs require reliable positioning. Forward planetary roller screw pairs primarily require fixing the nut, which necessitates a smaller fixing fixture due to the smaller nut size. However, positioning the lead screw in a reverse planetary roller screw pair requires a larger fixture due to its longer length. If a larger fixture is used to fix the nut in a forward planetary roller screw pair, the nut's outer surface is not flat, compromising the fixing effect. Therefore, this makes it inconvenient to test different types of planetary roller screw pairs. If different fixtures are directly used for testing reverse planetary roller screw pairs, the nut's rotation causes the lead screw to move, making multi-point positioning during movement difficult and hindering rapid fixing of the lead screw. This compromises the fixing effect and presents certain usage defects.

[0004] Therefore, we propose a precision testing device for planetary roller screw pairs to solve the problems mentioned above. Summary of the Invention

[0005] The purpose of this invention is to provide a precision testing device for planetary roller screw pairs, in order to solve the problems mentioned in the background art, such as the inconvenience of testing different types of planetary roller screw pairs, and the inconvenience of multi-point positioning during the movement of the screw due to the rotation of the nut when testing the reverse planetary roller screw pair, which makes it difficult to quickly fix the screw on the reverse planetary roller screw pair and ensure the fixing effect of the screw cannot be guaranteed.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a precision testing device for planetary roller screw pairs, comprising a testing table, a fixed plate symmetrically mounted on the top of the testing table, a servo motor fixedly mounted on one side of the fixed plate, and a three-jaw chuck symmetrically arranged on the top of the testing table, wherein the output end of the servo motor passes through the fixed plate on one side and is fixedly connected to the three-jaw chuck on one side.

[0007] Also includes:

[0008] Two sets of support rods are symmetrically installed below the two fixed plates;

[0009] A positioning assembly is disposed between two fixed plates, and the positioning assembly includes two movable frames;

[0010] Limiting components are symmetrically arranged on both sides of the two movable frames;

[0011] The movable frames are symmetrically arranged on one side above the testing table. Both movable frames have a turntable rotatably connected to their upper interiors. Limiting frames are fixedly installed on the lower sides of the two movable frames that are far apart from each other. The limiting frames are fixedly connected to the support rods. Meanwhile, the turntables are symmetrically threaded with screws inside. One end of each screw is rotatably connected to a first positioning plate and a second positioning plate, respectively. Guide rods are symmetrically installed on both sides of the first and second positioning plates, and the guide rods are slidably connected to the turntables.

[0012] Preferably, a fixed rod is fixedly installed above each of the two turntables on the side away from each other, and a cam is fixedly installed at the end of the fixed rod away from the turntable. A support frame is symmetrically installed on one side of the movable frame below the turntable. At the same time, a movable frame is slidably connected inside the two support frames, and the cam is slidably connected to the movable frame.

[0013] By adopting the above technical solution, the rotating turntable can lift the movable frame.

[0014] Preferably, a movable plate is fixedly installed at one end of the movable frame, and a movable rod is fixedly installed on one side of each of the two movable plates. Movable plates are symmetrically slidably connected to the outer side of the two sets of support rods. A movable seat is fixedly installed between the two movable plates. An installation groove is opened through one side of the movable seat. Limit rods are symmetrically slidably connected inside the installation groove. A connecting frame is slidably connected to the outer side of the two limit rods. Both movable rods are slidably connected to the connecting frame.

[0015] By adopting the above technical solution, the movement of the moving rod can drive the movement of the connecting frame.

[0016] Preferably, a return spring is fitted on the lower outer side of each of the two limit rods, and the two ends of the return spring are fixedly connected to the connecting frame and the mounting groove respectively. A movable groove is symmetrically opened through the lower sides of the movable seat, and a positioning rod is symmetrically installed at the bottom of the connecting frame, and the positioning rod is slidably connected to the movable seat.

[0017] By adopting the above technical solution, the connecting frame can be automatically reset after it is moved.

[0018] Preferably, a rectangular groove is provided through the bottom of the testing platform below the movable seat, and through grooves are provided through the top of the testing platform below the two second positioning plates. Fixing blocks are symmetrically installed on both sides of the bottom of the testing platform, and a lead screw is rotatably connected between the two fixing blocks. An adjustment motor is fixedly installed on one side of the left fixing block, and the output end of the adjustment motor passes through the left fixing block and is fixedly connected to the lead screw.

[0019] By adopting the above technical solution, the position of the positioning seat can be adjusted.

[0020] Preferably, a positioning seat is threadedly connected to the outer side of the lead screw, and the top of the positioning seat is in contact with the testing table. Positioning grooves are symmetrically opened on both sides of the top of the positioning seat, and the positioning rod is inserted into the positioning groove.

[0021] By adopting the above technical solution, the movable seat can move freely after the positioning rod leaves the positioning groove.

[0022] Preferably, a connecting plate is fixedly installed on one side of the connecting frame, and sliding rods are symmetrically installed on the top of the connecting plate. A positioning frame slides above the outside of the two sliding rods, and the positioning frame is fixedly connected to the movable seat. An arc-shaped plate is fixedly installed at the top of the two sliding rods, and several racks are fixedly installed on the top of the arc-shaped plate. A rotating seat is rotatably connected above one side of the movable seat, and a three-jaw chuck is fixedly connected to the rotating seat on the other side. A limit ring is fixedly installed on the outside of the rotating seat.

[0023] By adopting the above technical solution, the movement of the sliding rod can position the rotating seat.

[0024] Preferably, the limiting assembly includes two sets of mounting rods symmetrically installed on the upper sides of the movable frame, and each set of two mounting rods has a telescopic spring sleeved on one side. A connecting strip is fixedly installed on the end of the two mounting rods away from the movable frame. At the same time, a limiting plate is slidably connected to the outside of the two mounting rods on the side of the telescopic spring, and the two ends of the telescopic spring are fixedly connected to the limiting plate and the movable frame, respectively.

[0025] By adopting the above technical solution, the limiting plate can be automatically reset after it moves.

[0026] Preferably, an L-shaped rod is symmetrically installed on one side of the turntable, and a limiting hole is opened through one side of the limiting plate. A circular plate is fixedly installed on the outer side of the L-shaped rod, and the circular plate abuts against the limiting plate, while the telescopic spring is in a stretched state.

[0027] By adopting the above technical solution, the turntable can be reliably positioned.

[0028] Compared with the prior art, the beneficial effects of the present invention are: the precision detection device for planetary roller screw pairs makes it easy to switch between different sized positioning plates when facing different types of planetary roller screw pairs, thereby facilitating reliable positioning of the nut or screw according to the type of planetary roller screw pair. Moreover, after switching, when positioning the reverse planetary roller screw pair, the screw in the planetary roller screw pair can be quickly positioned at multiple points, which facilitates the movement of the screw in the reverse planetary roller screw pair, while avoiding rotation during the movement of the screw, thus improving the accuracy of the detection.

[0029] 1. When testing a planetary roller screw pair, if testing a forward planetary roller screw pair, place both ends of the screw on two three-jaw chucks and fix them. Then rotate the screw to bring the two first positioning plates closer together, fixing the external nut of the screw. Start the servo motor to rotate one side of the three-jaw chuck, which rotates the screw and the other side, causing the external nut of the screw to rotate. This moves the moving frame, and the moving frame moves the limit frame to slide on the support rod. A laser displacement sensor is installed on one side of the limit frame. The transmission accuracy of the forward planetary roller screw pair can be calculated by comparing the number of rotations of the screw with the displacement distance of the nut detected by the laser displacement sensor. When testing a reverse planetary roller screw pair, rotate the turntable half a turn, causing the second positioning plate to rotate circumferentially above the moving frame. The turntable drives the cam to rotate, which lifts the moving frame. After the moving frame is lifted, it moves the moving rod on the moving plate upward. After the moving rod moves upward, it can... The connecting frame is moved upward, which stretches the return spring. After the connecting frame moves upward, it moves the two positioning rods upward, causing the positioning rods to leave the positioning slots on the positioning seat, thus causing the movable seat to lose its limit. Then, the connecting shaft on the nut inside the reverse planetary roller screw pair is fixed by a three-jaw chuck on one side. Then, a three-jaw chuck on the other side can fix one end of the screw on the reverse planetary roller screw pair. The screw on the reverse planetary roller screw pair is fixed by a second positioning plate. The operation of the servo motor can drive the nut in the reverse planetary roller screw pair to rotate, causing the screw to move. During the movement, the screw can be positioned by the second positioning plate. At the same time, the screw is positioned and supported by the three-jaw chuck, which can perform multi-point positioning of the screw. Reliable positioning of the nut or screw can be achieved according to the type of planetary roller screw pair. After switching, when positioning the reverse planetary roller screw pair, multi-point positioning of the screw in the planetary roller screw pair can be performed quickly, which facilitates the movement of the screw in the reverse planetary roller screw pair and avoids rotation of the screw during movement, thus improving the detection accuracy.

[0030] 2. When inspecting the reverse planetary roller screw assembly, the rotating turntable can lift the connecting frame upwards. After the connecting frame moves upwards, it can drive the sliding rod upwards. After the sliding rod moves upwards, it slides on the positioning frame, causing the rack on the arc plate to be locked outside the limiting tooth ring. This allows the rotating seat to be positioned, and the three-jaw chuck on the other side to be positioned as well. Thus, when inspecting the reverse planetary roller screw assembly, the three-jaw chuck on the other side provides positioning support for one end of the screw, and the rotating seat is positioned, which can prevent the screw from rotating with the nut, avoid affecting the measurement accuracy, and improve the quality of inspection.

[0031] 3. When the turntable rotates, move the two limiting plates so that they slide on the mounting rod and stretch the telescopic spring. This causes the limiting holes on the limiting plates to disengage from the L-shaped rod. Then, the turntable rotates. After the turntable rotates half a revolution, move the limiting plates so that the L-shaped rod aligns with the limiting hole on the other limiting plate. Then, the limiting plates can be released. Under the action of the telescopic spring, the L-shaped rod inserts into the limiting hole, making the limiting plates fit against the circular plate. At this time, the telescopic spring is in a stretched state, making it difficult for the limiting plates to disengage from the L-shaped rod. This facilitates the operator in positioning the turntable, ensuring the reliability and convenience of turntable positioning. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0033] Figure 2 This is a schematic diagram of the overall structure of the present invention from another perspective;

[0034] Figure 3 This is a schematic diagram of the positive and negative planetary roller screw pair structure of the present invention;

[0035] Figure 4 This is a schematic diagram of the positioning component structure of the present invention;

[0036] Figure 5 This is a schematic diagram of the movable frame structure of the present invention;

[0037] Figure 6 This is a schematic diagram of the movable seat structure of the present invention;

[0038] Figure 7 This is a schematic diagram of the positioning seat structure of the present invention;

[0039] Figure 8 This is a partial structural diagram of the positioning component of the present invention;

[0040] Figure 9 For the present invention Figure 4 A magnified structural diagram of region A in the middle.

[0041] In the diagram: 1. Testing table; 101. Fixing plate; 102. Servo motor; 103. Three-jaw chuck; 104. Support rod; 2. Positioning assembly; 201. Moving frame; 202. Limiting frame; 203. Turntable; 204. Screw; 205. Guide rod; 206. First positioning plate; 207. Second positioning plate; 208. Fixing rod; 209. Cam; 210. Support frame; 211. Movable frame; 212. Moving plate; 213. Moving rod; 214. Movable plate; 215. Movable seat; 2151. Rectangular groove; 216. Mounting groove; 21 7. Limiting rod; 218. Connecting frame; 2181. Movable groove; 219. Return spring; 220. Positioning rod; 221. Fixing block; 222. Lead screw; 223. Positioning seat; 224. Positioning groove; 225. Connecting plate; 226. Sliding rod; 227. Positioning frame; 228. Arc plate; 229. Rack; 230. Rotating seat; 231. Limiting toothed ring; 3. Limiting assembly; 301. Mounting rod; 302. Telescopic spring; 303. Connecting strip; 304. Limiting plate; 305. L-shaped rod; 306. Limiting hole; 307. Circular plate. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. 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.

[0043] Please see Figures 1-9 The present invention provides a technical solution: a precision testing device for planetary roller screw pairs, including a testing table 1, a fixing plate 101 symmetrically installed on the top of the testing table 1, a servo motor 102 fixedly installed on one side of the fixing plate 101, and a three-jaw chuck 103 symmetrically arranged on the top of the testing table 1, while the output end of the servo motor 102 passes through the fixing plate 101 and is fixedly connected to the three-jaw chuck 103.

[0044] Also includes:

[0045] Two sets of support rods 104 are symmetrically installed below the two fixed plates 101;

[0046] Positioning component 2 is disposed between two fixed plates 101, and positioning component 2 includes two movable frames 201;

[0047] The movable frame 201 is symmetrically arranged on one side above the testing table 1. The upper part of each of the two movable frames 201 is rotatably connected to a turntable 203. The lower part of the two movable frames 201 on the opposite side is fixedly installed with a limit frame 202. The limit frame 202 is fixedly connected to the support rod 104. At the same time, the turntable 203 is symmetrically threaded with screws 204. One end of each screw 204 is rotatably connected to a first positioning plate 206 and a second positioning plate 207. Guide rods 205 are symmetrically installed on both sides of the first positioning plate 206 and the second positioning plate 207. The guide rods 205 are slidably connected to the turntable 203.

[0048] A fixed rod 208 is fixedly installed above the side of each of the two turntables 203 that is far apart from each other, and a cam 209 is fixedly installed at the end of the fixed rod 208 that is far away from the turntable 203. A support frame 210 is symmetrically installed on one side of the movable frame 201 below the turntable 203. A movable frame 211 is slidably connected inside the two support frames 210, and the cam 209 is slidably connected to the movable frame 211.

[0049] One end of the movable frame 211 is fixedly installed with a movable plate 212, and a movable rod 213 is fixedly installed on one side of each of the two movable plates 212. Movable plates 214 are symmetrically slidably connected to the outer side of the two sets of support rods 104. Movable seats 215 are fixedly installed between the two movable plates 214. A mounting groove 216 is opened through one side of the movable seat 215. Limiting rods 217 are symmetrically slidably connected inside the mounting groove 216. A connecting frame 218 is slidably connected to the outside of the two limiting rods 217. Both movable rods 213 are slidably connected to the connecting frame 218.

[0050] Two limit rods 217 are fitted with return springs 219 on their lower outer sides, and the two ends of the return springs 219 are fixedly connected to the connecting frame 218 and the mounting groove 216 respectively. The movable seat 215 has symmetrical movable grooves 2181 through its lower sides. Meanwhile, the bottom of the connecting frame 218 is symmetrically fitted with positioning rods 220, and the positioning rods 220 are slidably connected to the movable seat 215.

[0051] The bottom of the testing platform 1 is provided with a rectangular groove 2151 through it below the movable seat 215, and the top of the testing platform 1 is provided with through grooves through it below the two second positioning plates 207. Fixing blocks 221 are symmetrically installed on both sides of the bottom of the testing platform 1, and a lead screw 222 is rotatably connected between the two fixing blocks 221. An adjustment motor is fixedly installed on one side of the left fixing block 221, and the output end of the adjustment motor passes through the left fixing block 221 and is fixedly connected to the lead screw 222.

[0052] The lead screw 222 is threaded to a positioning seat 223 on its outer side, and the top of the positioning seat 223 is in contact with the testing table 1. The positioning seat 223 has symmetrical positioning grooves 224 on both sides of its top, and the positioning rod 220 is inserted into the positioning grooves 224.

[0053] Example 1: As Figures 1-8 As shown, when inspecting a planetary roller screw assembly, if inspecting a forward planetary roller screw assembly, the two ends of the screw on the forward planetary roller screw assembly are placed on two three-jaw chucks 103 respectively and then fixed. Then, the screw 204 is rotated to bring the two first positioning plates 206 closer together, so that the two first positioning plates 206 fix the external nut of the screw. The servo motor 102 is started to rotate one side of the three-jaw chuck 103, which in turn rotates the screw. This rotates the other side of the three-jaw chuck 103, causing the external nut of the screw to rotate, thus moving the moving frame 201. The moving frame 201 moves... Simultaneously, the limiting frame 202 slides on the support rod 104. A laser displacement sensor is installed on one side of the limiting frame 202. The transmission accuracy of the forward planetary roller screw pair can be calculated based on the number of rotations of the lead screw and the distance of the nut displacement detected by the laser displacement sensor. When testing the reverse planetary roller screw pair, the turntable 203 is rotated half a turn, causing the second positioning plate 207 to rotate circumferentially above the movable frame 201. The turntable 203 drives the cam 209 to rotate, which lifts the movable frame 211. After the movable frame 211 is lifted, it can drive the moving rod 213 on the movable plate 212 to move upward. After the moving rod 213 moves upward, it can drive the connecting frame 218 to move upward, thus stretching the return spring 219. After the connecting frame 218 moves upward, it can drive the two positioning rods 220 to move upward, causing the positioning rods 220 to leave the positioning grooves 224 on the positioning seat 223, causing the movable seat 215 to lose its limit. Then, the connecting shaft on the internal nut of the reverse planetary roller screw pair is fixed by the three-jaw chuck 103 on one side. Then, the three-jaw chuck 103 on the other side can fix one end of the screw on the reverse planetary roller screw pair. The screw on the reverse planetary roller screw pair is fixed by the second positioning plate 207. The operation of the servo motor 102 can drive the nut in the reverse planetary roller screw pair to rotate, causing the screw to move. During the movement, the screw can be positioned by the second positioning plate 207, and the screw is also positioned and supported by the three-jaw chuck 103. This allows for multi-point positioning of the screw. Depending on the type of planetary roller screw pair, the nut or the screw can be reliably positioned. After switching, when positioning the reverse planetary roller screw pair, the screw in the planetary roller screw pair can be quickly positioned at multiple points, facilitating the movement of the screw in the reverse planetary roller screw pair and preventing rotation during the movement of the screw, thus improving the accuracy of the detection.

[0054] A connecting plate 225 is fixedly installed on one side of the connecting frame 218, and sliding rods 226 are symmetrically installed on the top of the connecting plate 225. A positioning frame 227 slides above the outside of the two sliding rods 226. The positioning frame 227 is fixedly connected to the movable seat 215. An arc plate 228 is fixedly installed at the top of the two sliding rods 226. Several racks 229 are fixedly installed on the top of the arc plate 228. A rotating seat 230 is rotatably connected above one side of the movable seat 215. A three-jaw chuck 103 is fixedly connected to the rotating seat 230 on the other side. A limit ring 231 is fixedly installed on the outside of the rotating seat 230.

[0055] Example 2: Figure 6 and Figure 8 As shown, when inspecting the reverse planetary roller screw pair, the rotation of the turntable 203 can lift the connecting frame 218 upward. After the connecting frame 218 moves upward, it can drive the sliding rod 226 upward. After the sliding rod 226 moves upward, it slides on the positioning frame 227, so that the rack 229 on the arc plate 228 is locked outside the limiting gear ring 231, thereby positioning the rotating seat 230 and positioning the three-jaw chuck 103 on the other side. Thus, when inspecting the reverse planetary roller screw pair, the three-jaw chuck 103 on the other side provides positioning support for one end of the screw, and the rotating seat 230 is positioned, which can prevent the screw from rotating with the nut, avoid affecting the measurement accuracy, and improve the quality of inspection.

[0056] Limiting components 3 are symmetrically arranged on both sides of the two movable frames 201;

[0057] The limiting component 3 includes two sets of mounting rods 301 symmetrically installed on both sides of the movable frame 201. Each set of two mounting rods 301 has a telescopic spring 302 sleeved on one side. A connecting strip 303 is fixedly installed on the end of the two mounting rods 301 away from the movable frame 201. At the same time, a limiting plate 304 is slidably connected to the outside of the two mounting rods 301 on one side of the telescopic spring 302. The two ends of the telescopic spring 302 are fixedly connected to the limiting plate 304 and the movable frame 201, respectively.

[0058] An L-shaped rod 305 is symmetrically installed on one side of the turntable 203, and a limiting hole 306 is opened through one side of the limiting plate 304. A circular plate 307 is fixedly installed on the outer side of the L-shaped rod 305, and the circular plate 307 abuts against the limiting plate 304. The telescopic spring 302 is in a stretched state.

[0059] Example 3: Figure 4 and Figure 9As shown, when the turntable 203 is rotated, the two limiting plates 304 are moved, causing the limiting plates 304 to slide on the mounting rod 301 and stretch the telescopic spring 302. This causes the limiting hole 306 on the limiting plate 304 to disengage from the L-shaped rod 305. Then, the turntable 203 rotates. After the turntable 203 rotates half a revolution, the limiting plate 304 is moved so that the L-shaped rod 305 aligns with the limiting hole 306 on the other limiting plate 304. Then, the limiting plate 304 can be released, and under the action of the telescopic spring 302, the L-shaped rod 305 inserts into the limiting hole 306, so that the limiting plate 304 fits against the circular plate 307. At this time, the telescopic spring 302 is in a stretched state, making it difficult for the limiting plate 304 to disengage from the L-shaped rod 305. This facilitates the positioning of the turntable 203 by the operator, ensuring the reliability and convenience of the positioning of the turntable 203.

[0060] Working principle: When using this precision testing device for planetary roller screw pairs, firstly, according to... Figures 1-9As shown, when testing a planetary roller screw assembly, if testing a forward planetary roller screw assembly, the two ends of the screw on the forward planetary roller screw assembly are placed on two three-jaw chucks 103 respectively and then fixed. Then, the screw 204 is rotated to bring the two first positioning plates 206 closer together, so that the two first positioning plates 206 fix the external nut of the screw. The servo motor 102 is started to drive one side of the three-jaw chuck 103 to rotate, thus driving the screw to rotate, and driving the other side of the three-jaw chuck 103 to rotate, so that the external nut of the screw... The rotation of the nut causes the movable frame 201 to move. Simultaneously, the movable frame 201 moves, causing the limiting frame 202 to slide on the support rod 104. A laser displacement sensor is installed on one side of the limiting frame 202. The transmission accuracy of the forward planetary roller screw pair can be calculated based on the number of rotations of the lead screw and the distance of the nut displacement detected by the laser displacement sensor. When testing the reverse planetary roller screw pair, the turntable 203 is rotated half a turn, causing the second positioning plate 207 to rotate circumferentially above the movable frame 201. The turntable 203 then drives the cam... The rotation of cam 209 causes the movable frame 211 to be lifted. Lifting the movable frame 211 then moves the moving rod 213 on the moving plate 212 upwards. The upward movement of the moving rod 213 moves the connecting frame 218 upwards, stretching the return spring 219. The upward movement of the connecting frame 218 then moves the two positioning rods 220 upwards, causing them to leave the positioning grooves 224 on the positioning seat 223. This causes the movable seat 215 to lose its limit position. Then, the three-jaw chuck 103 on one side moves the reverse planetary rollers... The connecting shaft on the nut inside the ball screw pair is fixed. Then, the three-jaw chuck 103 on the other side can fix one end of the ball screw on the reverse planetary roller ball screw pair. The ball screw on the reverse planetary roller ball screw pair is fixed by the second positioning plate 207. The operation of the servo motor 102 can drive the nut in the reverse planetary roller ball screw pair to rotate, so that the ball screw moves. During the movement, the ball screw can be positioned by the second positioning plate 207. At the same time, the ball screw is positioned and supported by the three-jaw chuck 103, which can perform multi-point positioning of the ball screw.

[0061] When inspecting the reverse planetary roller screw pair, the rotation of the turntable 203 can lift the connecting frame 218 upwards. The upward movement of the connecting frame 218 drives the sliding rod 226 upwards. The sliding rod 226 then slides on the positioning frame 227, causing the rack 229 on the arc-shaped plate 228 to engage with the outside of the limiting gear ring 231. This positions the rotating seat 230, and also positions the three-jaw chuck 103 on the other side. Thus, during the inspection of the reverse planetary roller screw pair, the three-jaw chuck 103 on the other side provides positioning support for one end of the screw, and the rotating seat 230 is positioned, preventing the screw from rotating with the nut. When the turntable 203 rotates, the two limiting plates 3 move. 04. This causes the limiting plate 304 to slide on the mounting rod 301 and stretch the telescopic spring 302, thereby causing the limiting hole 306 on the limiting plate 304 to disengage from the L-shaped rod 305. Then, the turntable 203 rotates. After the turntable 203 rotates half a revolution, the limiting plate 304 is moved so that the L-shaped rod 305 is aligned with the limiting hole 306 on the other limiting plate 304. Then, the limiting plate 304 can be released. Under the action of the telescopic spring 302, the L-shaped rod 305 is inserted into the limiting hole 306, so that the limiting plate 304 is in contact with the round plate 307. At this time, the telescopic spring 302 is in a stretched state, making it difficult for the limiting plate 304 to disengage from the L-shaped rod 305, thus facilitating the positioning of the turntable 203 by the operator.

[0062] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0063] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A precision testing device for planetary roller screw pairs, comprising a testing table (1), wherein a fixing plate (101) is symmetrically mounted on the top of the testing table (1), and a servo motor (102) is fixedly mounted on one side of the fixing plate (101), and a three-jaw chuck (103) is symmetrically arranged on the top of the testing table (1), wherein the output end of the servo motor (102) passes through the fixing plate (101) on one side and is fixedly connected to the three-jaw chuck (103) on one side; Its features are, Also includes: Two sets of support rods (104) are symmetrically installed below the two fixed plates (101); A positioning component (2) is disposed between two fixed plates (101), the positioning component (2) including two movable frames (201). Limiting components (3) are symmetrically arranged on both sides of the two movable frames (201); The movable frames (201) are symmetrically arranged on one side above the testing table (1). A turntable (203) is rotatably connected to the upper part of each of the two movable frames (201). A limit frame (202) is fixedly installed below the side of each of the two movable frames (201) that is far apart from each other. The limit frame (202) is fixedly connected to the support rod (104). Simultaneously, screws (204) are symmetrically threaded inside the turntable (203). One end of each screw (204) is rotatably connected to a first positioning plate (206) and a second positioning plate (207). Guide rods are symmetrically installed on both sides of the first positioning plate (206) and the second positioning plate (207). (205), and the guide rod (205) is slidably connected to the turntable (203). A laser displacement sensor is provided on one side of the limiting frame (202). According to the number of rotations of the lead screw and the distance of the nut displacement detected by the laser displacement sensor, the positive planetary roller lead screw pair is detected. The two ends of the lead screw on the positive planetary roller lead screw pair are placed on the two three-jaw chucks (103) respectively and then fixed. When detecting the reverse planetary roller lead screw pair, the turntable (203) is rotated half a turn so that the second positioning plate (207) rotates to the top of the moving frame (201). The nut or lead screw is reliably positioned according to the type of planetary roller lead screw pair. A fixed rod (208) is fixedly installed above each of the two turntables (203) on the side away from each other, and a cam (209) is fixedly installed at the end of the fixed rod (208) away from the turntable (203). A support frame (210) is symmetrically installed on one side of the movable frame (201) below the turntable (203). A movable frame (211) is slidably connected inside the two support frames (210), and the cam (209) is slidably connected to the movable frame (211). One end of the movable frame (211) is fixedly installed with a movable plate (212), and a movable rod (213) is fixedly installed on one side of each of the two movable plates (212). Movable plates (214) are symmetrically slidably connected to the outer side of the two sets of support rods (104). Meanwhile, a movable seat (215) is fixedly installed between the two movable plates (214). A mounting groove (216) is provided through one side of the movable seat (215). Limiting rods (217) are symmetrically slidably connected inside the mounting groove (216). A connecting frame (218) is slidably connected to the outer side of the two limiting rods (217). Meanwhile, both movable rods (213) are slidably connected to the connecting frame (218).

2. The precision testing device for planetary roller screw pairs according to claim 1, characterized in that: A return spring (219) is fitted on the lower outer side of each of the two limiting rods (217), and the two ends of the return spring (219) are fixedly connected to the connecting frame (218) and the mounting groove (216) respectively. A movable groove (2181) is symmetrically opened through the lower sides of the movable seat (215). Meanwhile, a positioning rod (220) is symmetrically installed at the bottom of the connecting frame (218), and the positioning rod (220) is slidably connected to the movable seat (215).

3. The precision testing device for planetary roller screw pairs according to claim 2, characterized in that: The bottom of the testing platform (1) is provided with a rectangular groove (2151) through the movable seat (215) and the top of the testing platform (1) is provided with through grooves through the two second positioning plates (207). Fixing blocks (221) are symmetrically installed on both sides of the bottom of the testing platform (1). At the same time, a lead screw (222) is rotatably connected between the two fixing blocks (221). Meanwhile, an adjustment motor is fixedly installed on one side of the left fixing block (221), and the output end of the adjustment motor passes through the left fixing block (221) and is fixedly connected to the lead screw (222).

4. The precision testing device for planetary roller screw pairs according to claim 3, characterized in that: The lead screw (222) is threaded to a positioning seat (223) on one side, and the top of the positioning seat (223) is in contact with the testing table (1). The positioning seat (223) has symmetrical positioning grooves (224) on both sides of its top, and the positioning rod (220) is inserted into the positioning groove (224).

5. The precision testing device for planetary roller screw pairs according to claim 2, characterized in that: A connecting plate (225) is fixedly installed on one side of the connecting frame (218), and sliding rods (226) are symmetrically installed on the top of the connecting plate (225). A positioning frame (227) slides above the outside of the two sliding rods (226). The positioning frame (227) is fixedly connected to the movable seat (215). An arc plate (228) is fixedly installed at the top of the two sliding rods (226). Several racks (229) are fixedly installed on the top of the arc plate (228). A rotating seat (230) is rotatably connected above one side of the movable seat (215). The three-jaw chuck (103) on the other side is fixedly connected to the rotating seat (230). A limiting toothed ring (231) is fixedly installed on the outside of the rotating seat (230).

6. The precision testing device for planetary roller screw pairs according to claim 1, characterized in that: The limiting component (3) includes two sets of mounting rods (301) symmetrically installed on both sides of the movable frame (201). Each set of two mounting rods (301) has a telescopic spring (302) sleeved on one side. A connecting strip (303) is fixedly installed on one end of the two mounting rods (301) away from the movable frame (201). At the same time, a limiting plate (304) is slidably connected to the outside of the two mounting rods (301) on one side of the telescopic spring (302). The two ends of the telescopic spring (302) are fixedly connected to the limiting plate (304) and the movable frame (201) respectively.

7. The accuracy testing device for planetary roller screw pairs according to claim 6, characterized in that: An L-shaped rod (305) is symmetrically installed on one side of the turntable (203), and a limiting hole (306) is opened through one side of the limiting plate (304). A circular plate (307) is fixedly installed on the outer side of the L-shaped rod (305), and the circular plate (307) abuts against the limiting plate (304). The telescopic spring (302) is in a stretched state.

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