Device for detecting rolling-sliding ratio of planetary roller screw pair

Abstract

The invention discloses a device for detecting the rolling-sliding ratio of a planetary roller lead screw pair. The device comprises a roller simulation part and a columnar lead screw simulation part, a circular truncated cone is processed at one end of the lead screw simulation part, and the side surface of the circular truncated cone is a lead screw tooth-shaped contour surface; the roller simulation part comprises a roller thread section simulation circular ring; a pin roller thread simulation surface is arranged between the outer circumferential surface of the pin roller thread section simulation circular ring and each of the two end surfaces of the pin roller thread section simulation circular ring, and an included angle beta formed between each pin roller thread simulation surface and the outer circumferential surface is greater than 90 degrees and less than 180 degrees. The device provided by the invention can simulate the friction state and the rolling-sliding ratio of the contact position of the pin roller and the lead screw in the star pin roller lead screw pair, and allows the detection of the friction wear conditions of lead screws and pin rollers made of different materials through the arrangement of the replaceable pin roller threaded section simulation circular ring and the lead screw simulation part.

Description

Technical Field

[0001] The present invention relates to the technical field of lead screw drive systems. Specifically, it is a device for detecting the rolling-sliding ratio of a planetary roller screw pair. Background Art

[0002] A planetary roller screw pair is a rolling spiral drive mechanism that mutually converts linear motion and rotational motion. It transmits power through multi-point thread contact between multiple rollers and the thread grooves of the screw and nut, and has the advantages of many contact points, large load-bearing capacity, long service life, etc. Therefore, planetary roller screw pairs are widely used in fields such as numerical control machine tools, robots, aerospace, etc., and are particularly suitable for precision drive systems that require high loads and long service lives.

[0003] Although planetary roller screw pairs have obvious technical advantages, during actual use, it is difficult to directly detect the internal wear, friction conditions, and performance such as the rolling-sliding ratio. Currently, traditional detection methods mainly rely on manual experience or require disassembling the equipment for detection, which is not only time-consuming and laborious but also inefficient, and it is impossible to real-time monitor the frictional force and rolling-sliding ratio generated between the screw and the rollers during operation. Therefore, the existing technology still lacks a device that can conveniently and effectively detect the rolling-sliding ratio and frictional wear conditions of a planetary roller screw pair during operation. Summary of the Invention

[0004] For this reason, the technical problem to be solved by the present invention is to provide a device for detecting the rolling-sliding ratio of a planetary roller screw pair. This device is designed by simulating the contact method at the meshing position of the screw and roller thread segments, making the meshing position of the screw and roller thread segments visible, and facilitating the detection of the friction and rolling-sliding ratio during the operation of the roller screw.

[0005] To solve the above technical problems, the present invention provides the following technical solutions:

[0006] A device for detecting the rolling-sliding ratio of a planetary roller screw pair, including a roller simulation component and a screw simulation component; one end of the screw simulation component is processed with a frustum, and the side surface of the frustum is a screw tooth profile surface;

[0007] The roller simulation component includes a roller thread segment simulation ring; a roller thread simulation surface is provided between the outer circumferential surface of the roller thread segment simulation ring and each of the two end surfaces of the roller thread segment simulation ring, and the included angle β formed between the roller thread simulation surface and the outer circumferential surface is greater than 90° and less than 180°;

[0008] The extension line of the axis of the roller thread section simulating ring intersects and is perpendicular to the extension line of the axis of the frustum; a point contact is formed between one of the roller thread simulation surfaces of the roller thread section simulating ring and the lead screw tooth profile surface, and they rub and press against each other. By separately extracting the contact part between the roller and the lead screw, and using the replaceable roller thread section simulating ring and the lead screw tooth profile surface, this device can reproduce the friction situation under the actual working conditions. Such a design can effectively separate and detect the relative motion characteristics between the roller and the lead screw, especially the change of the rolling-sliding ratio, making the relative motion between the roller and the lead screw visible, facilitating the real-time detection of the rolling-sliding ratio, and contributing to the in-depth study of the friction and wear behavior of the roller screw pair under different working conditions.

[0009] In the above-mentioned rolling-sliding ratio detection device for the planetary roller screw pair, when the rolling-sliding ratio detection device for the planetary roller screw pair works, the roller thread section simulating ring rotates around the axis of the frustum, and the roller thread simulation surface rolls on the lead screw tooth profile surface and is accompanied by micro-sliding.

[0010] The above-mentioned rolling-sliding ratio detection device for the planetary roller screw pair further includes a first bearing and a cylindrical base table. The base table, the lead screw simulation component, and the frustum where the lead screw tooth profile surface is located are all coaxial; a fixing groove is provided on one end face of the base table, the lead screw simulation component is installed in the fixing groove, and the frustum protrudes from the end face of the base table; the inner ring of the first bearing is sleeved on the outer peripheral surface of the base table, and the roller simulation component is installed on the outer ring of the first bearing. The split design between the lead screw simulation component and the base table enables the device to replace the lead screw simulation component with different lead screw tooth profile surfaces to adapt to the simulation tests of lead screws with different thread profile angles or half-profile angles.

[0011] In the above-mentioned rolling-sliding ratio detection device for the planetary roller screw pair, the roller simulation component further includes a shaft rod coaxial with the roller thread section simulating ring and a second bearing; the inner ring of the second bearing is fixedly sleeved on one end of the shaft rod, and the roller thread section simulating ring is sleeved on the outer ring of the second bearing. The roller thread section simulating ring is sleeved on the outer ring of the second bearing, realizing the stable rotation of the roller thread section simulating ring. And the roller thread section simulating ring can be flexibly replaced to simulate different roller threads with different profile angles or half-profile angles.

[0012] In the above-mentioned rolling-sliding ratio detection device for the planetary roller screw pair, when the rolling-sliding ratio detection device for the planetary roller screw pair works: the shaft rod rotates around the axis of the base table, and the end where the second bearing is located always points to the axis of the base table; the outer ring of the second bearing and the roller thread section simulating ring both rotate around the axis of the shaft rod.

[0013] The above-mentioned rolling and sliding ratio detection device for planetary roller screw pairs, the shaft rod is divided into a smooth cylindrical section and a threaded section in the length direction, and the second bearing and the roller threaded section simulation ring are both located on the smooth cylindrical section.

[0014] The above-mentioned rolling and sliding ratio detection device for planetary roller screw pairs, the roller simulation component further includes a nut sleeve and a connecting frame; wherein:

[0015] The nut sleeve is screwed on the threaded section; the connecting frame is prismatic with four sides, and a clamping groove is machined on one side of the connecting frame; one end of the connecting frame is fixedly connected to the outer peripheral surface of the nut sleeve, and the other end is fixedly connected to the outer ring of the first bearing through the clamping groove;

[0016] When the rolling and sliding ratio detection device for planetary roller screw pairs works: the notch of the clamping groove faces the axis of the base table, and the outer ring of the first bearing and the connecting frame both rotate around the axis of the base table. The nut sleeve is screwed on the threaded section, one end of the connecting frame is fixedly connected to the outer peripheral surface of the nut sleeve, and the other end is fixedly connected to the outer ring of the first bearing through the clamping groove, which is beneficial to realizing the stable connection between the roller simulation component and the first bearing.

[0017] The shaft rod includes a smooth cylindrical section and a threaded section in the length direction, and a nut sleeve is screwed on the threaded section. This design not only enables the second bearing and the roller threaded section simulation ring to be stably installed on the shaft rod, but also facilitates adjusting the position of the shaft rod by rotating the shaft rod to compensate for the influence of the sliding amount between the roller threaded simulation surface and the screw thread profile surface on the detection result during the detection process.

[0018] The above-mentioned rolling and sliding ratio detection device for planetary roller screw pairs further includes a cage. The cage is cubic, and through holes are formed through two opposite sides of the cage; the shaft rod passes through the through holes, and the position of the cage on the shaft rod is between the second bearing and the nut sleeve;

[0019] When the rolling and sliding ratio detection device for planetary roller screw pairs works, a load perpendicular to the axis of the shaft rod and pointing to the base table is applied to the shaft rod through the cage, so that one of the roller threaded simulation surfaces of the roller threaded section simulation ring and the screw thread profile surface rub against each other and are pressed tightly.

[0020] The above-mentioned rolling and sliding ratio detection device for planetary roller screw pairs, the roller simulation component further includes a third bearing located in the through hole of the cage. The inner ring of the third bearing is sleeved on the smooth cylindrical section between the second bearing and the nut sleeve, and a surface contact is formed between the outer ring of the third bearing and the inner wall of the through hole of the cage and they are tightly abutted against each other.

[0021] For the above planetary roller screw pair rolling-sliding ratio detection device, the cage is fixedly connected to the nut sleeve.

[0022] The technical solution of the present invention has achieved the following beneficial technical effects:

[0023] 1. It is difficult to directly detect the internal wear condition of the planetary roller screw pair. Traditional detection methods usually require disassembling the equipment, which is time-consuming and laborious. The present invention provides a planetary roller screw pair rolling-sliding ratio detection device, which simplifies and simulates the contact part between the roller and the screw, designs a roller thread section simulation ring and a screw simulation component, effectively simulates the contact relationship between the screw and the roller in the planetary roller screw pair, and effectively simulates the friction wear and rolling-sliding ratio generated by the roller and the screw in the planetary roller screw pair during actual operation, thus realizing the real-time detection of friction wear and rolling-sliding ratio.

[0024] 2. The roller thread section simulation ring and the screw simulation component in the device provided by the present invention can both be disassembled and can be replaced with tooth profiles at different angles to meet the test requirements of screws and rollers with different tooth profile surfaces. In addition, the friction wear conditions under different materials can also be evaluated by replacing the roller thread section simulation ring and the screw simulation component with different materials.

[0025] 3. The present invention simplifies the complex working environment of the planetary roller screw pair, making the detection process more efficient and convenient. Through the design of the simulated contact structure, the device can directly measure the friction and rolling-sliding ratio between the screw and the roller in the planetary roller screw pair during operation without disassembling the equipment, thus providing strong support for the performance optimization and service life prediction of the planetary roller screw pair. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Exploded view of the planetary roller screw pair rolling-sliding ratio detection device in the embodiment of the present invention;

[0027] Figure 2 Structural diagram of the screw simulation component in the embodiment of the present invention;

[0028] Figure 3 Side view of the screw simulation component in the embodiment of the present invention, showing the included angle α between the screw tooth profile surface and the horizontal plane

[0029] Figure 4 Structural diagram of the roller simulation component in the embodiment of the present invention;

[0030] Figure 5 Schematic diagram of the shaft structure of the roller simulation component in the embodiment of the present invention;

[0031] Figure 6Schematic diagram of the positions of the end face, outer circumferential surface of the simulated ring of the roller thread section, and the roller thread simulation surface in the embodiment of the present invention;

[0032] Figure 7 Side view of the simulated ring of the roller thread section in the embodiment of the present invention, showing the angle β between the roller thread simulation surface and the outer circumferential surface in the figure;

[0033] Figure 8 Schematic diagram of the connecting frame structure in the embodiment of the present invention

[0034] Figure 9 Schematic diagram of the nut sleeve structure in the embodiment of the present invention;

[0035] Figure 10 Schematic diagram of the cage structure in the embodiment of the present invention;

[0036] Figure 11 Schematic diagram of the overall structure of the planetary roller screw pair rolling-sliding ratio detection device after assembly in the embodiment of the present invention.

[0037] In the figure, the reference numerals are represented as: 1 - base table; 2 - screw rod simulation component; 201 - screw rod tooth profile surface; 202 - clamping block; 3 - roller simulation component; 301 - simulated ring of the roller thread section; 3011 - outer circumferential surface; 3012 - roller thread simulation surface; 3013 - end face; 302 - shaft rod; 3021 - smooth cylindrical section; 3022 - threaded section; 303 - second bearing; 304 - nut sleeve; 305 - connecting frame; 3051 - clamping groove; 306 - third bearing; 4 - first bearing; 5 - cage. Detailed implementation manners

[0038] As Figure 1 shown, in this embodiment, a planetary roller screw pair rolling-sliding ratio detection device is provided, mainly including the following components: base table 1, screw rod simulation component 2, roller simulation component 3, first bearing 4, and cage 5. The positional relationship and interaction between these components are described as follows:

[0039] Base table 1: The base table 1 is a cylindrical structure. A fixing groove is provided on the upper end face of the base table 1 for fixing the screw rod simulation component 2.

[0040] Screw rod simulation component 2: As Figure 2As shown, the lead screw simulation component 2 is a columnar component with a cylindrical base and a frustum of a cone machined at the top. The conical side surface of the frustum of the cone is the lead screw thread profile surface 201. A protruding block 202 is provided on the side surface of the cylindrical section at the base of the lead screw simulation component 2. When the rolling and sliding ratio detection device of the planetary roller screw pair is assembled, the cylindrical section at the base of the lead screw simulation component 2 is installed in the fixed groove at the top of the base table, and the frustum of the cone at the top protrudes above the upper end surface of the base table, and the block 202 is stuck in the notch on the side wall of the fixed groove to prevent the lead screw simulation component 2 from rotating in the fixed groove. As Figure 3 shown, the angle α between the lead screw thread profile surface 201 and the horizontal plane is 45° for simulating a lead screw thread with a thread half angle of 45°.

[0041] When it is necessary to simulate a lead screw thread with a thread half angle of other values, the lead screw simulation component can be removed and replaced separately.

[0042] The base table 1, the lead screw simulation component 2, and the frustum of the cone where the lead screw thread profile surface 201 is located are all coaxial. A first bearing 4 is installed on the outer peripheral surface of the base table. The inner ring of the first bearing 4 is sleeved on the outer peripheral surface of the base table, and the outer ring of the first bearing 4 is connected to the roller simulation component 3, that is, the roller simulation component 3 is installed on the outer ring of the first bearing 4.

[0043] Roller simulation component 3: As Figure 1 shown, the roller simulation component 3 is entirely located above the base table 1 and the lead screw simulation component 2. Figure 4 is the structural diagram of the roller simulation component 3. The roller simulation component 3 includes a shaft rod 302, a second bearing 303, and a roller thread section simulation ring 301. The roller thread section simulation ring 301, the shaft rod 302, and the second bearing 303 are coaxially arranged.

[0044] The shaft rod 302 is cylindrical, and the extension line of its axis intersects and is perpendicular to the extension line of the axis of the base table 1. That is to say, the extension line of the axis of the roller thread section simulation ring 301 intersects and is perpendicular to the extension line of the axis of the frustum of the cone where the lead screw thread profile surface 201 is located. The shaft rod is divided into a smooth cylindrical section 3021 and a threaded section 3022 in the length direction, as Figure 5 shown. The inner ring of the second bearing 303 is fixedly sleeved on the smooth cylindrical section 3021 and is close to the end position of the shaft rod 302 (that is, the inner ring of the second bearing 303 is fixedly sleeved on one end of the shaft rod 302). The roller thread section simulation ring 301 is sleeved on the outer ring of the second bearing 303. The roller thread section simulation ring 301 is connected to the shaft rod 302 through the second bearing 303.

[0045] As Figure 6As shown in the figure, the roller thread section simulation ring 301 has an outer circumferential surface 3011, two end faces 3013, and a roller thread simulation surface 3012 provided between the outer circumferential surface 3011 and the end faces 3013. Among them, the circumferential diameter of the outer circumferential surface 3011 is greater than the outer diameter of the end face 3013 (the end face 3013 is an annular surface). As Figure 7 shown, the included angle β formed between the roller thread simulation surface 3012 and the outer circumferential surface 3011 is 135°, which is used to simulate the thread tooth of the roller thread section with a thread profile half angle of 45°. A point contact is formed between the roller thread simulation surface 3012 and the lead screw thread profile surface 201.

[0046] In some other embodiments, the value of the included angle α between the lead screw thread profile surface 201 and the upper end face of the base table, and the value of the included angle β formed between the roller thread simulation surface 3012 and the outer circumferential surface 3011 can both be flexibly adjusted according to the thread profile angles (thread profile half angles) of the lead screw thread and the roller thread to be simulated, but the value of the included angle β is generally greater than 90° and less than 180°. In addition, the outer circumferential surface 3011 can also infinitely approach a line, that is, the width of the outer circumferential surface 3011 can infinitely approach 0.

[0047] A nut sleeve 304 is screwed on the thread section 3022 of the shaft rod 302. A connecting frame 305 is fixedly connected to the lower part of the outer circumferential surface of the nut sleeve 304. As Figure 8 shown, the connecting frame 305 is generally a quadrangular prism shape, and a clamping groove 3051 is provided on one of its side faces. The upper end of the connecting frame 305 is connected to the nut sleeve 304, and the lower end is connected to the outer ring of the first bearing 4 through the clamping groove 3051. A handle is also installed on the side face opposite to the clamping groove 3051.

[0048] Cage 5: The cage 5 is a cube structure, and through holes are provided on two opposite side faces thereof, and the shaft rod 302 passes through the through holes. The position of the cage 5 on the shaft rod 302 is located between the second bearing 303 and the nut sleeve 304. The cage 5 and the nut sleeve 304 are fixedly connected by a flange, Figure 9 shown as the flange on the nut sleeve 304. The flange of the cage 5 is provided on the side facing the nut sleeve 304 and surrounds the periphery of the through hole, as Figure 10 shown.

[0049] When the planetary roller screw pair rolling-sliding ratio detection device in this embodiment is working, an external force applies a load perpendicular to the axis of the shaft rod 302 and pointing to the base table 1 to the shaft rod through the cage 5, further causing friction and compression between the roller thread simulation surface 3012 of the roller thread section simulation ring 301 and the lead screw thread profile surface 201, simulating the contact pressure in the actual working state.

[0050] In this embodiment, the cage 5 is not directly sleeved on the shaft rod 302, but is connected to the shaft rod 302 through a third bearing 306 located in the through hole of the cage 5. The third bearing 306 and the second bearing 303 are of the same type. The inner ring of the third bearing 306 is sleeved on the shaft rod 302, and the third bearing 306 is located on the smooth cylindrical section 3021 between the second bearing and the nut sleeve. A surface contact is formed between the outer ring of the third bearing 306 and the inner wall of the through hole of the cage 5 and they are tightly abutted against each other, so that when the nut sleeve rotates, the cage can rotate together. The third bearing 306 can support the cage 5, and when a load is applied to the cage, the applied load can be transmitted to the shaft rod 302 through the third bearing 306.

[0051] Since there is micro-slip between the roller thread simulation surface 3012 and the lead screw tooth profile surface 201 during the actual working process, when using this device to detect the rolling-sliding ratio, in order to make up for the influence of the sliding amount on the detection result, it is necessary to timely correct the position of the roller thread section simulation ring 301. Since the position of the roller thread section simulation ring 301 on the shaft rod is fixed, and the distance between the nut sleeve and the lead screw tooth profile surface 201 is fixed, but the position of the nut sleeve on the shaft rod is adjustable; therefore, by rotating the shaft rod, the relative position between the shaft rod and the nut sleeve can be adjusted, so that the contact position between the roller thread section simulation ring 301 and the lead screw tooth profile surface 201 changes, to make up for the influence of the sliding amount between the roller thread simulation surface 3012 and the lead screw tooth profile surface 201 on the detection result during the detection process.

[0052] In this embodiment, the nut sleeve 304 is fixedly connected to the cage. When the connecting frame is pushed, the connecting frame drives the nut sleeve 304 to rotate, so that the shaft rod 302 rotates around the axis of the base table 1. At this time, the force applied by the nut sleeve 304 to the shaft rod and the load applied by the cage 5 to the shaft rod can be synchronously transmitted, avoiding the extra friction or offset caused by the relative movement between the cage and the nut sleeve, and also avoiding the decrease in the stability and accuracy of the measurement; and since the cage is connected to the shaft rod through a third bearing, when the shaft rod is rotated (to eliminate the sliding amount between the roller thread simulation surface 3012 and the lead screw tooth profile surface 201 during the detection process), the cage will not rotate with the rotation of the shaft rod, and the friction between the shaft rod and the inner ring of the third bearing basically will not affect the cage, which is beneficial to the cage to remain stable during the rotation of the shaft rod, which is beneficial to improving the stability of the measurement result. At the same time, the fixed connection makes the overall structure more compact.

[0053] In some other embodiments, the nut sleeve 304 and the cage 5 may not be connected, and at this time the cage 5 can be directly sleeved on the shaft rod.

[0054] The schematic diagram of the planetary roller screw pair rolling-sliding ratio detection device provided in this embodiment when assembled is as follows Figure 11 shown; when using the planetary roller screw pair rolling-sliding ratio detection device provided in this embodiment, the connecting frame is pushed by the handle installed on the connecting frame 305. At this time, the outer ring of the first bearing 4, the connecting frame 305, the shaft rod 302, and the roller thread section simulation ring 301 all rotate around the axis of the base table 1. During this process, the notch of the clamping groove 3051 always faces the axis of the base table 1, and one end of the shaft rod 302 (that is, the end where the second bearing 303 is located) always points to the axis of the base table 1. At the same time, the cage 5 applies a load perpendicular to the axis of the shaft rod 302 and pointing to the base table 1 to ensure that there is friction between the roller thread section simulation ring 301 and the lead screw tooth profile surface 201. The roller thread simulation surface 3012 rolls on the lead screw tooth profile surface 201 and is accompanied by micro-sliding, simulating the working state of the planetary roller screw pair, which is convenient for detecting the friction and wear conditions and the rolling-sliding ratio (that is, the ratio of the rolling motion to the sliding motion of the planetary roller and the lead screw at the contact point) between the planetary roller and the lead screw when the roller screw is working.

[0055] In the device provided in this embodiment, the roller thread section simulation ring 301 and the lead screw simulation component 2 are both detachable, which is convenient for testing the friction and wear conditions between the roller thread section simulation rings 301 and the lead screw simulation components 2 made of different materials.

[0056] Obviously, the above embodiments are only examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or variations derived therefrom are still within the protection scope of the claims of this patent application.

Claims

1. A planetary roller screw pair rolling-slip ratio detection device, characterized in that: It comprises a roller simulation component (3) and a screw simulation component (2); one end of the screw simulation component (2) is processed with a truncated cone, and the side surface of the truncated cone is a screw tooth profile surface (201); The roller simulation component (3) comprises a roller thread segment simulation ring (301); a roller thread simulation surface (3012) is respectively arranged between the outer circumferential surface (3011) of the roller thread segment simulation ring (301) and two end surfaces (3013) of the roller thread segment simulation ring (301); an angle β formed between the roller thread simulation surface (3012) and the outer circumferential surface (3011) is greater than 90° and less than 180°; The extension line of the axis of the roller thread segment simulation ring (301) intersects and is perpendicular to the extension line of the axis of the truncated cone; a roller thread simulation surface (3012) of the roller thread segment simulation ring (301) and the screw thread profile surface (201) form point contact, and rub and press against each other.

2. The planetary roller screw pair rolling-slip ratio detection device according to claim 1, characterized in that: When the planetary roller screw pair rolling-slip ratio detection device is in operation, the roller thread segment simulated ring (301) rotates around the axis of the truncated table, and the roller thread simulated surface (3012) rolls on the screw thread profile surface (201) accompanied by micro-slippage.

3. The planetary roller screw pair rolling-slip ratio detection device according to claim 2, characterized in that: It also includes a first bearing (4) and a cylindrical base (1), wherein the base (1), the screw simulation component (2), and the truncated cone on which the screw tooth profile surface (201) is located are all coaxial; a fixing groove is provided on one end face of the base (1), the screw simulation component (2) is installed in the fixing groove, and the truncated cone protrudes from the end face of the base (1); the inner ring of the first bearing (4) is sleeved on the outer peripheral surface of the base (1), and the roller simulation component (3) is installed on the outer ring of the first bearing (4).

4. The planetary roller screw pair rolling-slip ratio detection device according to claim 3, characterized in that: The roller simulation component (3) also includes a shaft (302) and a second bearing (303) coaxial with the roller thread segment simulation ring (301); the inner ring of the second bearing (303) is fixedly sleeved on one end of the shaft (302), and the roller thread segment simulation ring (301) is sleeved on the outer ring of the second bearing (303).

5. The planetary roller screw pair rolling-slip ratio detection device according to claim 4, characterized in that: When the planetary roller screw pair rolling-slip ratio detection device is working: the shaft (302) rotates around the axis of the base (1), and the end where the second bearing (303) is located always points to the axis of the base (1); the outer ring of the second bearing (303) and the roller thread segment simulation ring (301) both rotate with the axis of the shaft (302) as the rotation axis.

6. The planetary roller screw pair rolling-slip ratio detection device according to claim 4, characterized in that: The shaft (302) is divided into a smooth cylindrical section (3021) and a threaded section (3022) in the length direction, and the second bearing (303) and the roller threaded section simulation ring (301) are both located on the smooth cylindrical section (3021).

7. The planetary roller screw pair rolling-slip ratio detection device according to claim 6, characterized in that: The roller simulation component (3) further comprises a nut sleeve (304) and a connecting frame (305); wherein: The nut sleeve (304) is screwed onto the threaded section (3022); the connecting frame (305) is in the shape of a quadrangular prism, and a clamping groove (3051) is processed on one side of the connecting frame (305); one end of the connecting frame (305) is fixedly connected to the outer peripheral surface of the nut sleeve (304), and the other end is fixedly connected to the outer ring of the first bearing (4) through the clamping groove (3051); When the planetary roller screw pair rolling-slip ratio detection device is working: the notch of the clamping groove (3051) faces the axis of the base platform (1), and the outer ring of the first bearing (4) and the connecting frame (305) both rotate around the axis of the base platform (1).

8. The planetary roller screw pair rolling-slip ratio detection device according to claim 7, characterized in that: It also comprises a retaining frame (5), the retaining frame (5) is a cube, and two opposite sides of the retaining frame (5) are provided with through holes; the shaft (302) passes through the through holes, and the position of the retaining frame (5) on the shaft (302) is located between the second bearing (303) and the nut sleeve (304); When the planetary roller screw pair rolling-slip ratio detection device is working, a load perpendicular to the axis of the shaft (302) and directed toward the base platform (1) is applied to the shaft (302) through the retaining frame (5), so that a roller thread simulation surface (3012) of the roller thread segment simulation ring (301) and the screw tooth profile surface (201) rub against each other and are pressed tightly.

9. The planetary roller screw pair rolling-slip ratio detection device according to claim 8, characterized in that: The roller simulation component (3) also includes a third bearing (306) located in the through hole of the retaining frame (5), the inner ring of the third bearing (306) is sleeved on the smooth cylindrical section (3021) between the second bearing (303) and the nut sleeve (304), and the outer ring of the third bearing (306) forms a surface contact with the inner wall of the through hole of the retaining frame (5) and presses against each other.

10. The planetary roller screw pair rolling-slip ratio detection device according to claim 9, characterized in that: The retaining frame (5) and the nut sleeve (304) are fixedly connected.

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