A ball screw pair structure capable of improving positioning accuracy

Abstract

The present invention discloses a ball screw pair structure capable of improving positioning accuracy, and relates to the technical field of ball screws, including a screw body, a positioning support unit, a closing unit, a cleaning unit and a cooling unit. A nut body is installed on the outside of the screw body, and the positioning support unit is symmetrically arranged on the outside of the nut body, and is used to limit the support of the screw body to prevent the nut body from shaking due to the gap outside the screw body. The closing unit is symmetrically arranged on both sides of the nut body, the cleaning unit is arranged on one side of the closing unit, and the cooling unit is arranged on the top of the nut body. The present invention drives the limiting wheel to move toward the screw body through an electric telescopic rod, and at the same time, the pressure detection unit detects the pressure of the limiting wheel on the screw body, so that the pressure around the screw body is the same, and shaking between the screw body and the nut body due to the gap is avoided, thereby improving the positioning accuracy of the screw body and the nut body.

Description

Technical Field

[0001] The invention relates to the technical field of ball screws, and in particular to a ball screw pair structure capable of improving positioning accuracy. Background Art

[0002] A ball screw pair is a transmission mechanism that converts rotational motion into linear motion. In a ball screw pair, kinetic energy is transmitted between the nut and the screw through steel balls, which can reduce friction and save energy loss during transmission. The positioning accuracy of a ball screw is easily deteriorated due to the gap between the ball, nut and screw.

[0003] The defects of the existing ball screw pair are:

[0004] 1. Prior art JP3168571U discloses an external circulation ball screw, which can easily install a rolling body circulation passage, improve the efficiency of assembly, and does not require an auxiliary clamp for attachment to reduce manufacturing costs. If there is a gap between the steel ball and the nut of the ball screw pair, it is easy to cause radial shaking between the nut and the screw, resulting in poor positioning accuracy. Therefore, a ball screw pair structure that can reduce radial shaking and improve positioning accuracy is needed to solve this problem.

[0005] 2. Prior art JP2017015145A discloses a ball screw and a method for producing the same, and a ball screw actuator. This technology significantly reduces the weight of the structure while maintaining sufficient strength. There is a gap between the ball screw nut and the screw rod, and external dust can easily enter the nut through the groove, causing an increase in impurities inside the nut. The wear of the steel balls inside the nut will cause the nut to become agglomerate, affecting the service life. Therefore, a ball screw pair structure that can reduce the entry of external dust into the ball screw pair and improve positioning accuracy is needed to solve this problem.

[0006] 3. Prior art JPH08226516A discloses a ball screw and a forming method. This technology achieves a long life by suppressing dust generation and improving lubricity. The ball screw is unable to remove impurities from the joint between the ball nut and the screw. When more impurities accumulate at the joint between the nut and the screw, it is easy for the impurities to enter the nut, causing the wear of the ball screw pair to increase. Therefore, a ball screw pair structure that can clean the impurities at the joint between the nut and the screw and improve the positioning accuracy is needed to solve this problem.

[0007] 4. Prior art CN113738837A discloses a ball screw pair with a safety device, which can avoid accidents by avoiding loss of travel control, and can also greatly improve safety and reduce losses. The ball screw pair does not have a cooling structure. When the temperature rises due to abnormal increase in friction inside the screw pair, the screw pair is more easily damaged at high temperatures. Therefore, a ball screw pair structure that can detect the temperature of the screw pair and can cool down the temperature to improve positioning accuracy is needed to solve this problem. Summary of the invention

[0008] One purpose of the present application is to provide a ball screw pair structure that can improve positioning accuracy and solve the technical problems raised in the prior art.

[0009] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a ball screw pair structure capable of improving positioning accuracy, comprising a screw body, a positioning support unit, a sealing unit, a cleaning unit and a cooling unit, wherein a nut body is installed on the outside of the screw body, the positioning support unit is symmetrically arranged on the outside of the nut body, and is used to provide position-limiting support for the screw body to prevent the nut body from shaking due to clearance on the outside of the screw body, and the sealing unit is symmetrically arranged on both sides of the nut body, and is used to prevent external dust from entering the inside of the nut body;

[0010] The cleaning unit is arranged at one side of the enclosing unit to clean the impurities on the enclosing unit, and the cooling unit is arranged at the top of the nut body to cool the screw body and the nut body.

[0011] Preferably, a timing unit is installed on the front side of the nut body, and a control unit is installed on the front side of the nut body.

[0012] Preferably, a steel ball is movably installed through the outer side of the screw rod body, and a ball return device is installed inside the nut body.

[0013] Preferably, the positioning support unit includes a right-angle plate, an electric telescopic rod 1, a moving rod, a pressure detection unit, a guide tube, a lifting frame and a limiting wheel. The four right-angle plates are symmetrically installed on the outside of the nut body. A plurality of electric telescopic rods 1 are installed on the top of the right-angle plate. The electric telescopic rod 1 is electrically connected to the control unit by signal. The moving rod is installed on the output end of the electric telescopic rod 1. A pressure detection unit is installed on one end of the moving rod. The pressure detection unit is electrically connected to the control unit by signal. A guide tube is installed on the outside of the pressure detection unit, and the guide tube is located on the outside of the moving rod. A lifting frame is installed on the bottom of the guide tube, and a plurality of limiting wheels are movably installed through the inner side of the lifting frame.

[0014] Preferably, the closing unit comprises a frame body 1, a rotating wheel 1, a rotating wheel 2, a rotating ring, a rod body and a closing rubber, and the multiple frame bodies 1 are symmetrically installed on both sides of the nut body, a rotating wheel 1 is symmetrically penetrated through the inner side of the frame body 1 and movably installed, a rotating wheel 2 is penetrated through the inner side of the frame body 1 and movably installed, and the rotating wheel 1 and the rotating wheel 2 are perpendicular to each other, a rotating ring is movably installed on the inner side of the frame body 1, a rod body is installed on the top inner wall of the rotating ring, and a closing rubber is installed on one end of the rod body.

[0015] Preferably, the cleaning unit comprises an electric telescopic rod 2 and a cleaning brush. The electric telescopic rod 2 is mounted on one side of the frame 1, and the electric telescopic rod 2 is electrically connected to the control unit, and the cleaning brush is mounted on the output end of the electric telescopic rod 2.

[0016] Preferably, a frame body 2 is symmetrically mounted on the bottom of the nut body, and a collecting box is movably mounted on the inner side of the frame body 2.

[0017] Preferably, the cooling unit includes a liquid nitrogen tank, a solenoid valve, a transmission tube 1, a compression tube, a vent, an electric telescopic rod 3, a compression plate, a transmission tube 2 and a temperature detection unit. The liquid nitrogen tank is installed on the top of the nut body, a solenoid valve is installed on one side output end of the liquid nitrogen tank, the solenoid valve is electrically connected to the control unit, a transmission tube 1 is installed on the output end of the solenoid valve, the compression tube is installed on the top of the nut body, vents are symmetrically opened on the outside of the compression tube, an electric telescopic rod 3 is installed on the top of the compression tube, the electric telescopic rod 3 is electrically connected to the control unit, a compression plate is installed on the output end of the electric telescopic rod 3, a transmission tube 2 is installed on the bottom output end of the compression tube, and one end of the transmission tube 2 passes through the top inner wall of the ball returner, a temperature detection unit is installed on the front of the nut body, and the temperature detection unit is electrically connected to the control unit.

[0018] Preferably, the method for using the ball screw pair structure capable of improving positioning accuracy is as follows:

[0019] S1, the electric telescopic rod drives the limiting wheel to move toward the screw body, and at the same time, the pressure detection unit detects the pressure of the limiting wheel on the screw body. When the pressure of the limiting wheel on the screw body is greater than the set value, the control unit controls the electric telescopic rod to drive the limiting wheel to move away from the screw body. When the pressure of the limiting wheel on the screw body is less than the set value, the control unit controls the electric telescopic rod to drive the limiting wheel to move toward the screw body;

[0020] S2. When the screw body rotates, the sealing rubber moves in the groove of the screw body, and then the sealing rubber rotates with the rotation of the groove of the screw body, so that the rotating ring rotates outside the screw body. The sealing rubber prevents foreign matter from entering the inside of the nut body through the wire groove of the screw body, and at the same time, the sealing rubber can scrape off the impurities in the groove of the screw body;

[0021] S3. The temperature of the nut body is detected by the temperature detection unit. When the temperature of the nut body is higher than the set value, the control unit controls the solenoid valve to open for a moment, so that a small amount of nitrogen in the liquid nitrogen tank enters the compression tube. At the same time, the electric telescopic rod drives the compression plate to move downward to spray the nitrogen in the compression tube into the nut body, thereby cooling the inside of the nut body.

[0022] Preferably, the step S2 further includes the following steps:

[0023] S21, timing is performed by the timing unit. Every time the timing unit passes a set time length, the control unit controls the second electric telescopic rod to drive the cleaning brush to move toward the screw body, thereby scraping impurities at the joint between the screw body and the sealing rubber and dropping them into the collection box.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The present invention drives the limiting wheel to move toward the screw body through the electric telescopic rod, and at the same time, the pressure detection unit detects the pressure of the limiting wheel on the screw body. When the pressure of the limiting wheel on the screw body is greater than the set value, the control unit controls the electric telescopic rod to drive the limiting wheel to move away from the screw body. When the pressure of the limiting wheel on the screw body is less than the set value, the control unit controls the electric telescopic rod to drive the limiting wheel to move toward the screw body, so that the ball screw substructure that can improve the positioning accuracy drives the limiting wheel to move toward the screw body through the electric telescopic rod. At the same time, the pressure detection unit detects the pressure of the limiting wheel on the screw body, so that the pressure around the screw body is the same, thereby avoiding shaking between the screw body and the nut body due to the gap, and improving the positioning accuracy of the screw body and the nut body.

[0026] 2. In the present invention, when the screw body rotates, the sealing rubber moves in the groove of the screw body, and then the sealing rubber rotates with the rotation of the groove of the screw body, so that the rotating ring rotates outside the screw body, and the sealing rubber prevents foreign impurities from entering the interior of the nut body through the wire groove of the screw body, and at the same time, the sealing rubber can scrape off the impurities in the groove of the screw body, so that the ball screw sub-structure that can improve the positioning accuracy can prevent foreign impurities from entering the interior of the nut body through the wire groove of the screw body through the sealing rubber, and at the same time, the sealing rubber can scrape off the impurities in the groove of the screw body.

[0027] 3. The present invention performs timing through a timing unit. Every time the timing unit passes a set time length, the control unit controls the second electric telescopic rod to drive the cleaning brush to move toward the screw body, thereby scraping impurities at the joint between the screw body and the closed rubber and dropping them into the collection box. The ball screw sub-structure that can improve the positioning accuracy can be timed by the timing unit, and the second electric telescopic rod can be controlled to drive the cleaning brush to move toward the screw body, thereby scraping impurities at the joint between the screw body and the closed rubber and dropping them into the collection box.

[0028] 4. The present invention detects the temperature of the nut body through a temperature detection unit. When the temperature of the nut body is higher than a set value, the control unit controls the solenoid valve to open for a moment, so that a small amount of nitrogen in the liquid nitrogen tank enters the interior of the compression tube. At the same time, the electric telescopic rod drives the compression plate to move downward to spray the nitrogen in the compression tube into the interior of the nut body, thereby cooling the interior of the nut body. The ball screw sub-structure that can improve the positioning accuracy detects the temperature of the nut body through the temperature detection unit. When the temperature of the nut body is higher than the set value, the nitrogen in the nitrogen tank can enter the interior of the nut body, thereby cooling the interior of the nut body. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A perspective view of the present invention;

[0030] Figure 2 It is a front cross-sectional view of the present invention;

[0031] Figure 3 It is a schematic diagram of the structure of A of the present invention;

[0032] Figure 4 It is a schematic diagram of the right-angle plate structure of the present invention;

[0033] Figure 5 It is a schematic diagram of the guide tube structure of the present invention;

[0034] Figure 6 It is a schematic diagram of the structure of the cleaning brush of the present invention;

[0035] Figure 7 It is a schematic diagram of a structure of a frame of the present invention;

[0036] Figure 8 It is a schematic diagram of the structure of the rotating ring of the present invention;

[0037] Fig. 9 is a control flow chart of the present invention;

[0038] Fig.10 The figure is a flow chart of the method for using the present invention.

[0039] In the figure: 1. screw rod body; 2. nut body; 3. steel ball; 4. ball returner; 5. right angle plate; 6. electric telescopic rod 1; 7. moving rod; 8. pressure detection unit; 9. guide tube; 10. lifting frame; 11. limiting wheel; 12. frame 1; 13. rotating wheel 1; 14. rotating wheel 2; 15. rotating ring; 16. rod body; 17. sealing rubber; 18. electric telescopic rod 2; 19. cleaning brush; 20. frame 2; 21. collecting box; 22. liquid nitrogen tank; 23. solenoid valve; 24. transmission tube 1; 25. compression tube; 26. vent; 27. electric telescopic rod 3; 28. compression plate; 29. ​​transmission tube 2; 30. temperature detection unit; 31. timing unit; 32. control unit. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0042] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] See also Figure 1 , Figure 2 and Figure 3 , an embodiment provided by the present invention: a ball screw pair structure capable of improving positioning accuracy;

[0044] It includes a screw body 1, a nut body 2 is installed on the outside of the screw body 1, a timing unit 31 is installed on the front of the nut body 2, a control unit 32 is installed on the front of the nut body 2, a steel ball 3 is movably installed through the outside of the screw body 1, and a ball return device 4 is installed inside the nut body 2. The screw body 1 can drive the nut body 2 to move left and right by rotating, and the nut body 2 can provide an installation position for the right-angle plate 5. The timing unit 31 is a timer, which can perform timing and transmit the timing information to the control unit 32. The control unit 32 is a controller, which can receive signals from the pressure detection unit 8, the temperature detection unit 30 and the timing unit 31, and can provide control for the electric telescopic rod 1 6, the electric telescopic rod 2 18, the solenoid valve 23 and the electric telescopic rod 3 27. The movement of the steel ball 3 in the groove of the screw body 1 and the nut body 2 can simplify the friction when the nut body 2 moves, and the ball return device 4 can make the steel ball moved to the tail end of the nut body 2 return to the head end of the nut body 2.

[0045] See also Figure 1 , Figure 4 and Figure 5 , an embodiment provided by the present invention: a ball screw pair structure capable of improving positioning accuracy;

[0046] It includes a positioning support unit, which is symmetrically arranged on the outside of the nut body 2 and is used to limit the support of the screw body 1 to prevent the nut body 2 from shaking due to the gap on the outside of the screw body 1. The positioning support unit includes a right-angle plate 5, an electric telescopic rod 6, a moving rod 7, a pressure detection unit 8, a guide tube 9, a lifting frame 10 and a limiting wheel 11. Four right-angle plates 5 are symmetrically installed on the outside of the nut body 2. A plurality of electric telescopic rods 6 are installed on the top of the right-angle plate 5. The electric telescopic rod 6 is connected to the control unit 32 by electrical signals. The output end of the electric telescopic rod 6 is installed with a moving rod 7. One end of the moving rod 7 is installed with a pressure detection unit 8. The pressure detection unit 8 is connected to the control unit 32 by electrical signals. A guide tube 9 is installed on the outside of the pressure detection unit 8, and the guide tube 9 A lifting frame 10 is installed at the bottom of the guide tube 9 on the outside of the moving rod 7. A plurality of limiting wheels 11 are movably installed on the inner side of the lifting frame 10. The right-angle plate 5 can provide an installation position for the electric telescopic rod 6. The electric telescopic rod 6 can convert electrical energy into kinetic energy, thereby driving the moving rod 7 to move up and down. The moving rod 7 can drive the lifting frame 10 to move up and down by moving up and down. The pressure detection unit 8 is a pressure sensor that can detect the pressure of the limiting wheel 11 on the screw body 1. The guide tube 9 can provide guidance for the moving rod 7. The lifting frame 10 can drive the limiting wheel 11 to move up and down by moving up and down. The limiting wheel 11 can apply pressure to the screw body 1, thereby preventing the screw body 1 and the nut body 2 from radially shaking due to the gap, thereby improving the positioning accuracy.

[0047] See also Figure 1 , Figure 6 , Figure 7 and Figure 8 , an embodiment provided by the present invention: a ball screw pair structure capable of improving positioning accuracy;

[0048] The nut body 2 includes a sealing unit, which is symmetrically arranged on both sides of the nut body 2 to prevent external dust from entering the inside of the nut body 2. The sealing unit includes a frame 12, a rotating wheel 13, a rotating wheel 14, a rotating ring 15, a rod 16 and a sealing rubber 17. A plurality of frames 12 are symmetrically installed on both sides of the nut body 2. The inner side of the frame 12 is symmetrically penetrated with a rotating wheel 13 movably installed. The inner side of the frame 12 is penetrated with a rotating wheel 14 movably installed, and the rotating wheel 13 and the rotating wheel 14 are perpendicular to each other. The inner side of the frame 12 is movably installed with a rotating ring 15. The top inner wall of the rotating ring 15 is installed with a rod 16. The rod 16 A sealing rubber 17 is installed at one end of the screw body 1, and the frame body 12 can provide an installation position for the rotating wheel 13 and the rotating wheel 2 14. The rotating wheel 13 and the rotating wheel 2 14 can provide a limit for the rotating ring 15 and reduce the friction when the rotating ring 15 rotates. The rotating ring 15 can provide an installation position for the rod body 16, so that the rod body 16 can rotate. The rod body 16 can provide an installation position for the sealing rubber 17. The sealing rubber 17 can move in the groove of the screw body 1. As the groove rotates, the sealing rubber 17, the rod body 16 and the rotating ring 15 will also rotate. The sealing rubber 17 can prevent external dust from entering the inside of the nut body 2 through the groove of the screw body 1.

[0049] See also Figure 1 and Figure 6 , an embodiment provided by the present invention: a ball screw pair structure capable of improving positioning accuracy;

[0050] It includes a cleaning unit, which is arranged on one side of the closed unit and is used to clean up impurities on the closed unit. The cleaning unit includes an electric telescopic rod 18 and a cleaning brush 19. The electric telescopic rod 18 is installed on one side of the frame 12, and the electric telescopic rod 18 is electrically connected to the control unit 32. The output end of the electric telescopic rod 18 is installed with the cleaning brush 19. The bottom of the nut body 2 is symmetrically installed with a frame 20, and the inner side of the frame 20 is movably installed with a collecting box 21. The electric telescopic rod 18 can convert electrical energy into kinetic energy, thereby driving the cleaning brush 19 to move up and down. The cleaning brush 19 can clean the joint between the screw body 1 and the closed rubber 17 by moving downward. The frame 20 can provide an installation position for the collecting box 21, and the collecting box 21 can collect impurities dropped from the screw body 1.

[0051] See also Figure 1 , Figure 2 and Figure 3, an embodiment provided by the present invention: a ball screw pair structure capable of improving positioning accuracy;

[0052] It includes a cooling unit, which is arranged at the top of the nut body 2 and is used to cool the screw body 1 and the nut body 2. The cooling unit includes a liquid nitrogen tank 22, a solenoid valve 23, a transmission tube 1 24, a compression tube 25, a vent 26, an electric telescopic rod 3 27, a compression plate 28, a transmission tube 29 and a temperature detection unit 30. The liquid nitrogen tank 22 is installed on the top of the nut body 2. The solenoid valve 23 is installed at one side output end of the liquid nitrogen tank 22. The solenoid valve 23 is connected to the control unit 32 by electrical signals. The output end of the solenoid valve 23 is installed with a transmission tube 1 24. The compression tube 25 is installed at the top of the nut body 2. The outer side of the compression tube 25 is symmetrically penetrated with vents 26. The top of the compression tube 25 is installed with an electric telescopic rod 3 27. The electric telescopic rod 3 27 is connected to the control unit 32 by electrical signals. The output end of the electric telescopic rod 3 27 is installed with a compression plate 28. The bottom output end of the compression tube 25 is installed with a transmission tube 29. One end of the transmission tube 29 passes through the top inner wall of the ball returner 4, a temperature detection unit 30 is installed on the front of the nut body 2, and the temperature detection unit 30 is electrically connected to the control unit 32. The liquid nitrogen tank 22 can provide storage space for liquid nitrogen, and the solenoid valve 23 controls the liquid nitrogen inside the liquid nitrogen tank 22 to enter the transmission tube 1 24. The transmission tube 1 24 can provide a transmission path for the liquid nitrogen inside the liquid nitrogen tank 22 to enter the compression tube 25. The compression tube 25 can provide a movement space for the compression plate 28. The vent 26 can allow the air inside the compression tube 25 to pass through the outside world. The electric telescopic rod 3 27 can convert electrical energy into kinetic energy, thereby driving the compression plate 28 to move up and down. The compression plate 28 can press the nitrogen and air inside the compression tube 25 into the nut body 2 by moving downward, thereby cooling the inside of the nut body 2. The transmission tube 29 can provide a transmission path for the gas inside the compression tube 25 to enter the nut body 2.

[0053] The method of using the ball screw pair structure that can improve positioning accuracy is as follows:

[0054] S1, the electric telescopic rod 16 drives the limiting wheel 11 to move toward the screw body 1, and at the same time, the pressure detection unit 8 detects the pressure of the limiting wheel 11 on the screw body 1. When the pressure of the limiting wheel 11 on the screw body 1 is greater than the set value, the control unit 32 controls the electric telescopic rod 16 to drive the limiting wheel 11 to move away from the screw body 1. When the pressure of the limiting wheel 11 on the screw body 1 is less than the set value, the control unit 32 controls the electric telescopic rod 16 to drive the limiting wheel 11 to move toward the screw body 1;

[0055] S2. When the screw body 1 rotates, the sealing rubber 17 moves in the groove of the screw body 1, and then the sealing rubber 17 rotates with the rotation of the groove of the screw body 1, so that the rotating ring 15 rotates outside the screw body 1. The sealing rubber 17 prevents foreign matter from entering the inside of the nut body 2 through the wire groove of the screw body 1, and the sealing rubber 17 can scrape off the foreign matter in the groove of the screw body 1;

[0056] S3. The temperature of the nut body 2 is detected by the temperature detection unit 30. When the temperature of the nut body 2 is higher than the set value, the control unit 32 controls the solenoid valve 23 to open for a moment, so that a small amount of nitrogen in the liquid nitrogen tank 22 enters the compression tube 25. At the same time, the electric telescopic rod 27 drives the compression plate 28 to move downward to spray the nitrogen in the compression tube 25 into the nut body 2, thereby cooling the inside of the nut body 2.

[0057] S2 also includes the following steps:

[0058] S21, timing is performed by the timing unit 31. When the timing unit 31 passes a set time length, the control unit 32 controls the electric telescopic rod 18 to drive the cleaning brush 19 to move toward the screw body 1, thereby scraping impurities at the joint between the screw body 1 and the sealing rubber 17 and dropping them into the collection box 21.

[0059] Working principle: Before using the ball screw pair structure that can improve the positioning accuracy, you should first check whether the ball screw pair structure that can improve the positioning accuracy has any problems that affect the use. The electric telescopic rod 6 drives the limiting wheel 11 to move toward the screw body 1. At the same time, the pressure detection unit 8 detects the pressure of the limiting wheel 11 on the screw body 1. When the pressure of the limiting wheel 11 on the screw body 1 is greater than the set value, the control unit 32 controls the electric telescopic rod 6 to drive the limiting wheel 11 to move away from the screw body 1. When the pressure of the limiting wheel 11 on the screw body 1 is less than the set value, the control unit 32 controls the electric telescopic rod 6 to drive the limiting wheel 11 to move toward the screw body 1. When the screw body 1 rotates, the sealing rubber 17 moves in the groove of the screw body 1, and then the sealing rubber 17 rotates with the rotation of the groove of the screw body 1, so that the rotating ring 15 rotates outside the screw body 1. The sealing rubber 17 prevents foreign matter from entering the nut body 2 through the wire groove of the screw body 1. At the same time, the sealing rubber 17 can scrape off the impurities in the groove of the screw body 1. The timing is performed by the timing unit 31. When the timing unit 31 passes a set time, the control unit 32 controls the electric telescopic rod 2 18 to drive the cleaning brush 19 to move toward the screw body 1, so that the impurities at the joint of the screw body 1 and the sealing rubber 17 are scraped off and fall into the collection box 21. The temperature of the nut body 2 is detected by the temperature detection unit 30. When the temperature of the nut body 2 is higher than the set value, the solenoid valve 23 is controlled to open for a moment by the control unit 32, so that a small amount of nitrogen in the liquid nitrogen tank 22 enters the compression tube 25. At the same time, the electric telescopic rod 3 27 drives the compression plate 28 to move downward to spray the nitrogen inside the compression tube 25 into the nut body 2, thereby cooling the inside of the nut body 2.

[0060] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, from all points of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any reference signs in the claims should not be regarded as limiting the rights involved.

Claims

1. A ball screw pair structure capable of improving positioning accuracy, characterized in that: The invention comprises a screw body (1), a positioning support unit, a sealing unit, a cleaning unit and a cooling unit, wherein a nut body (2) is mounted on the outside of the screw body (1), the support unit is symmetrically arranged on the outside of the nut body (2) and is used to provide position-limiting support for the screw body (1) to prevent the nut body (2) from shaking due to clearance on the outside of the screw body (1), and the sealing unit is symmetrically arranged on both sides of the nut body (2) and is used to prevent external dust from entering the inside of the nut body (2); The cleaning unit is arranged on one side of the enclosed unit and is used to clean impurities on the enclosed unit. The cooling unit is arranged on the top of the nut body (2) and is used to cool the screw body (1) and the nut body (2). A timing unit (31) is installed on the front side of the nut body (2), and a control unit (32) is installed on the front side of the nut body (2); The positioning support unit comprises a right-angle plate (5), an electric telescopic rod (6), a moving rod (7), a pressure detection unit (8), a guide tube (9), a lifting frame (10) and a limiting wheel (11); the four right-angle plates (5) are symmetrically mounted on the outside of the nut body (2); a plurality of electric telescopic rods (6) are mounted on the top of the right-angle plate (5); and the electric telescopic rods (6) are electrically connected to a control unit (32); a moving rod (7) is mounted on the output end of the electric telescopic rod (6); a pressure detection unit (8) is mounted on one end of the moving rod (7); and the pressure detection unit (8) is electrically connected to the control unit (32); a guide tube (9) is mounted on the outside of the pressure detection unit (8); and the guide tube (9) is located on the outside of the moving rod (7); a lifting frame (10) is mounted on the bottom of the guide tube (9); and a plurality of limiting wheels (11) are movably mounted on the inner side of the lifting frame (10); The sealing unit comprises a frame body 1 (12), a rotating wheel 1 (13), a rotating wheel 2 (14), a rotating ring (15), a rod body (16) and a sealing rubber (17); a plurality of the frame bodies 1 (12) are symmetrically mounted on both sides of the nut body (2); a rotating wheel 1 (13) is symmetrically and movably mounted on the inner side of the frame body 1 (12); a rotating wheel 2 (14) is movably mounted on the inner side of the frame body 1 (12); the rotating wheel 1 (13) and the rotating wheel 2 (14) are perpendicular to each other; a rotating ring (15) is movably mounted on the inner side of the frame body 1 (12); a rod body (16) is mounted on the inner wall of the top of the rotating ring (15); and a sealing rubber (17) is mounted on one end of the rod body (16); The cleaning unit comprises an electric telescopic rod 2 (18) and a cleaning brush (19); the electric telescopic rod 2 (18) is mounted on one side of the frame 1 (12), and the electric telescopic rod 2 (18) is connected to the control unit (32) via an electrical signal; the cleaning brush (19) is mounted on the output end of the electric telescopic rod 2 (18); The cooling unit comprises a liquid nitrogen tank (22), a solenoid valve (23), a transmission tube 1 (24), a compression tube (25), a vent (26), an electric telescopic rod 3 (27), a compression plate (28), a transmission tube 2 (29) and a temperature detection unit (30); the liquid nitrogen tank (22) is mounted on the top of the nut body (2); a solenoid valve (23) is mounted on one side output end of the liquid nitrogen tank (22); the solenoid valve (23) is electrically connected to a control unit (32); a transmission tube 1 (24) is mounted on the output end of the solenoid valve (23); the compression tube (25) is mounted on the top of the nut body (2); The outer side of the compression tube (25) is symmetrically penetrated with ventilation holes (26); the top of the compression tube (25) is equipped with an electric telescopic rod (27), and the electric telescopic rod (27) is electrically connected to a control unit (32); the output end of the electric telescopic rod (27) is equipped with a compression plate (28); the bottom output end of the compression tube (25) is equipped with a transmission tube (29), and one end of the transmission tube (29) penetrates the top inner wall of the ball return device (4); the front of the nut body (2) is equipped with a temperature detection unit (30), and the temperature detection unit (30) is electrically connected to the control unit (32).

2. A ball screw pair structure capable of improving positioning accuracy according to claim 1, characterized in that: A steel ball (3) is movably installed through the outside of the screw rod body (1), and a ball return device (4) is installed inside the nut body (2).

3. A ball screw pair structure capable of improving positioning accuracy according to claim 1, characterized in that: A second frame (20) is symmetrically mounted on the bottom of the nut body (2), and a collection box (21) is movably mounted on the inner side of the second frame (20).

4. A method for using a ball screw pair structure capable of improving positioning accuracy according to any one of claims 1 to 3, characterized in that: The method of using the ball screw pair structure capable of improving positioning accuracy is as follows: S1, driving the limiting wheel (11) to move toward the screw body (1) through the electric telescopic rod (6), and at the same time, the pressure detection unit (8) detects the pressure of the limiting wheel (11) on the screw body (1), when the pressure of the limiting wheel (11) on the screw body (1) is greater than a set value, the control unit (32) controls the electric telescopic rod (6) to drive the limiting wheel (11) to move away from the screw body (1), and when the pressure of the limiting wheel (11) on the screw body (1) is less than the set value, the control unit (32) controls the electric telescopic rod (6) to drive the limiting wheel (11) to move toward the screw body (1); S2. When the screw body (1) rotates, the sealing rubber (17) moves in the groove of the screw body (1), and then the sealing rubber (17) rotates along with the rotation of the groove of the screw body (1), so that the rotating ring (15) rotates outside the screw body (1). The sealing rubber (17) prevents foreign matter from entering the inside of the nut body (2) through the groove of the screw body (1), and at the same time, the sealing rubber (17) can scrape away the foreign matter in the groove of the screw body (1); S3. The temperature of the nut body (2) is detected by the temperature detection unit (30). When the temperature of the nut body (2) is higher than the set value, the control unit (32) controls the solenoid valve (23) to open for a moment, so that a small amount of nitrogen in the liquid nitrogen tank (22) enters the interior of the compression tube (25). At the same time, the electric telescopic rod (27) drives the compression plate (28) to move downward to spray the nitrogen in the compression tube (25) into the interior of the nut body (2), thereby cooling the interior of the nut body (2).

5. The method for using a ball screw pair structure capable of improving positioning accuracy according to claim 4, characterized in that: The step S2 also includes the following steps: S21, timing is performed by the timing unit (31), and each time the timing unit (31) reaches a set time length, the control unit (32) controls the second electric telescopic rod (18) to drive the cleaning brush (19) to move toward the screw body (1), thereby scraping impurities at the joint between the screw body (1) and the sealing rubber (17) and dropping them into the collection box (21).

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