Cooling structure and cooling control method for a helical pair

Abstract

This invention discloses a cooling structure and cooling control method for a helical pair. The cooling structure includes a lead screw, an inner guide tube, a rear cooling plate, a lead screw plug, and a cooling generator. The lead screw has an axially extending cooling channel. One end of the lead screw has a rear cooling plate, and the other end has a lead screw plug sealing the cooling channel. The inner guide tube passes through the cooling channel, with one end connected to the rear cooling plate and the other end connected to the lead screw plug. The outer wall of the inner guide tube and the inner wall of the cooling channel form a return channel. The rear cooling plate has cooling return holes connected to the cooling generator via pipes, and a cooling return groove connected to the cooling return holes and the return channel. The inner hole of the inner guide tube at one end of the rear cooling plate is connected to the cooling generator via a pipe. This cooling structure and cooling control method for the helical pair can effectively cool the temperature of the lead screw during operation, preventing performance failure caused by excessive helical temperature. Furthermore, the structure is simple, easy to manufacture, and suitable for application in various helical pair motion applications.

Description

Technical Field

[0001] This invention relates to the technical field of screw drive devices, specifically a cooling structure and cooling control method for a screw pair. Background Technology

[0002] With the development of industrial automation, ball screw assemblies are widely used in high-speed, heavy-duty motion applications such as CNC machine tools and precision worktables due to their advantages of high motion accuracy, low noise, and high transmission efficiency. However, under heavy load and high-frequency operating conditions, a large amount of heat is generated between the screw and the screw nut due to friction and load, causing the temperature of the screw and nut to rise sharply. This temperature rise not only causes thermal deformation of the screw, affecting positioning accuracy and repeatability, but also accelerates the deterioration of the lubricating grease, weakens the rolling performance of the balls, and in severe cases, even leads to screw seizure or premature failure. Traditional spiral cooling mechanisms are complex in structure and difficult to manufacture, making large-scale application difficult.

[0003] Therefore, the aforementioned technical problems need to be solved. Summary of the Invention

[0004] To address the above-mentioned technical problems, this invention provides a cooling structure and cooling control method for a screw pair, which can effectively cool the temperature of the lead screw during operation, prevent performance failure caused by excessive screw temperature, and has a simple structure that is easy to process and form, making it suitable for various applications of screw pair motion.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows:

[0006] A cooling structure for a spiral pair includes a lead screw, an inner guide tube, a rear cooling plate, a lead screw plug, and a cooling generating device, all mounted on a support platform.

[0007] The lead screw is provided with an axially extending cooling channel; one end of the lead screw is provided with the rear cooling plate, and the other end is provided with the lead screw plug to seal the cooling channel;

[0008] The inner conduit is inserted into the cooling channel, with one end connected to the rear cooling plate and the other end connected to the screw plug; the outer wall of the inner conduit and the inner wall of the cooling channel form a return channel.

[0009] The rear cooling plate is provided with cooling return holes that are connected to the cooling generating device through pipes; the rear cooling plate is provided with cooling return grooves that connect the cooling return holes and the return channel; the inner conduit is located at one end of the rear cooling plate and is connected to the cooling generating device through an inner hole pipe.

[0010] The cooling generating device inputs the cooling medium into the inner hole of the inner conduit at one end where the rear cooling plate is located, and into the return channel at the other end, flowing back to the cooling generating device through the cooling return tank and cooling return hole.

[0011] The cooling structure of this spiral assembly integrates the flow structure required for the cooling medium to circulate within the cooling channel of the lead screw and the stationary rear cooling plate. Compared to machining complex flow channels inside the rotating shaft, this structure is simpler and more reliable, solving the problems of difficult dynamic sealing and high machining costs inside the rotating shaft. The cooling medium circulates in and out along the entire length of the lead screw, resulting in uniform and efficient cooling; it prevents performance failure caused by excessive spiral temperature, and its simple structure facilitates machining and forming.

[0012] In a further optimized design, the rear cooling plate is connected to the lead screw via a bearing, preventing the rear cooling plate from rotating with the lead screw. The use of a bearing achieves separation of static and dynamic components, resulting in low frictional resistance, high positioning accuracy, and reliable stable operation of the seal between the stationary rear cooling plate and the rotating lead screw, thus extending the seal life.

[0013] A further optimized design incorporates seals on the rear cooling plate connecting the lead screw and the inner conduit, ensuring a seal between the cooling return groove and the lead screw, and between the inner conduit and the rear cooling plate. These seals guarantee a completely sealed cooling circuit from input to return, enhancing system reliability.

[0014] The design is further optimized by incorporating a plug return groove in the lead screw plug that connects the inner bore of the inner guide tube to the return channel. This integration of the steering and return function into the lead screw plug results in a compact structure that serves both as a seal and as a flow channel connector, reducing the need for additional parts or machining steps and facilitating assembly.

[0015] A further optimized design includes a guide tube return hole at one end of the inner guide tube where the screw plug is located, connecting the inner bore of the inner guide tube to the return channel. Directly opening the hole in the inner guide tube simplifies the process and allows for flexible control of the return flow rate and distribution by adjusting the position and number of openings.

[0016] Further optimization of the design includes a temperature detection device; the lead screw is equipped with a matching lead screw nut, and the temperature detection device is mounted on the lead screw nut to detect its temperature. Directly measuring the temperature of the lead screw nut, which is the core heat source and a key component, can most accurately and quickly reflect the actual thermal state of the lead screw assembly.

[0017] Further optimization of the solution includes a control system, which is electrically connected to both the temperature detection device and the cooling generator. The control system controls the start and stop of the cooling generator based on the temperature detected by the temperature detection device. This control system enables intelligent on-demand cooling, effectively preventing overheating of the lead screw and ensuring motion accuracy. It also avoids ineffective operation of the cooling system, significantly reducing energy consumption and noise, and extending the lifespan of the cooling system itself.

[0018] A cooling control method for a spiral pair, using the aforementioned cooling structure of the spiral pair, includes the following steps:

[0019] Step 1: The temperature of the lead screw nut is obtained in real time using the temperature detection device;

[0020] Step 2: When the detected temperature exceeds the set value T0, the control system starts the cooling generator, drives the cooling medium into the inner hole of the inner conduit at one end where the rear cooling plate is located, and into the return channel at the other end, flowing back to the cooling generator through the cooling return tank and cooling return hole, thus circulating the cooling process.

[0021] Step 3: When the temperature is detected to be lower than the set value T0, the control system controls the cooling generator to stop outputting the cooling medium.

[0022] The cooling control method of this screw pair is based solely on the temperature of the lead screw and nut. The control logic is simple and reliable, and it can achieve the best balance between cooling efficiency and energy saving, making it highly practical.

[0023] The cooling structure and cooling control method of the spiral pair of the present invention have the following technical advantages compared with the prior art:

[0024] 1. By integrating an inner conduit, a plug, and a matching cooling plate within the cooling channel of the lead screw, the cooling medium circulates between the inside and outside of the lead screw, resulting in uniform and efficient cooling; and preventing performance failure caused by excessive spiral temperature.

[0025] 2. The rear cooler plate integrates the functions of fixing, sealing and returning fluid interface of the inner tube, reducing the dependence on external rotary joints and improving reliability and seal life;

[0026] 3. The temperature detection device is directly installed on the lead screw nut, a critical heat-generating component, which can reflect the actual temperature rise in a timely and accurate manner, avoiding cooling lag or over-cooling caused by improper detection position;

[0027] 4. The control system performs closed-loop start-stop control based on the actual temperature of the lead screw and nut, which not only ensures the thermal stability of the screw pair, but also avoids unnecessary continuous circulation of the cooling medium, thus saving energy. Attached Figure Description

[0028] Figure 1 This is a cross-sectional front view of the first embodiment of the cooling structure of the spiral pair of the present invention;

[0029] Figure 2 yes Figure 1 Left sectional view;

[0030] Figure 3 yes Figure 1 Sectional front view of the mid-rear cooling plate;

[0031] Figure 4 yes Figure 3 The right view;

[0032] Figure 5 yes Figure 1 Sectional front view of the lead screw plug;

[0033] Figure 6 yes Figure 5 The right view;

[0034] Figure 7 yes Figure 1 Front sectional view of the internal duct;

[0035] Figure 8 This is a cross-sectional front view of the second embodiment of the cooling structure of the spiral pair of the present invention;

[0036] Figure 9 yes Figure 8 Sectional front view of the lead screw plug;

[0037] Figure 10 yes Figure 9 The right view;

[0038] Figure 11 yes Figure 8 Front view of the cross-section of the internal duct.

[0039] In the diagram: 1. Control system; 2. Signal line; 3. Bearing; 4. Rear cooling plate; 5. Seal; 6. First cooling connector; 7. Second cooling connector; 8. First cooling pipe; 9. Second cooling pipe; 10. Cooling generator; 11. Support platform; 12. Synchronous pulley; 13. First bearing module; 14. Rear fixing plate; 15. Lead screw; 16. Cooling channel; 17. Inner guide tube; 18. Inner hole; 19. Temperature detection device; 20. Lead screw nut; 21. Load; 22. Sliding support device; 23. Second bearing module; 24. Front fixing plate; 25. Lead screw plug; 26. Motor; 27. Synchronous belt; 28. Guide tube fixing hole; 29. ​​Cooling return hole; 30. Plug positioning hole; 31. Plug return groove; 32. Thread; 33. Lead screw end cap; 34. End cap positioning hole; 35. Guide tube return hole; 36. Cooling medium; 37. Return channel; 38. Cooling return groove. Detailed Implementation

[0040] The present invention will now be described in further detail with reference to the embodiments shown in the accompanying drawings.

[0041] like Figures 1 to 7 As shown, this is a first embodiment of the cooling structure of the spiral pair of the present invention; as Figures 8 to 11 As shown, this is a second embodiment of the cooling structure of the spiral pair of the present invention.

[0042] like Figure 1 As shown, the cooling structure of the spiral pair in the first embodiment includes a lead screw 15, an inner guide tube 17, a rear cooling plate 4, a lead screw plug 25, and a cooling generating device 10; the lead screw 15 is provided with an axially extending cooling channel 16; one end of the lead screw 15 is provided with a rear cooling plate 4, and the other end is provided with a lead screw plug 25 to seal the cooling channel 16; the inner guide tube 17 passes through the cooling channel 16, one end of the inner guide tube 17 is connected to the rear cooling plate 4, and the other end is connected to the lead screw plug 25; the outer wall of the inner guide tube 17 and the inner wall of the cooling channel 16 form a return channel 37.

[0043] like Figure 3 and Figure 4 As shown, the rear cooling plate 4 is provided with a conduit fixing hole 28, and one end of the inner conduit 17 is fixed to the conduit fixing hole 28. Figure 5 and Figure 6 As shown, the screw plug 25 is provided with a plug positioning hole 30, and the other end of the inner guide tube 17 is fixed on the plug positioning hole 30. The screw plug 25 is provided with a plug return groove 31 that connects the inner hole 18 of the inner guide tube 17 and the return channel 37. By directly connecting the plug positioning hole 30 and the plug return groove 31, the plug return groove 31 can be connected to the inner hole 18 of the inner guide tube 17 and the return channel 37.

[0044] like Figure 1 , Figure 3 and Figure 4 As shown, the rear cooling plate 4 is provided with a cooling return hole 29, which is connected to the cooling generating device 10 through a pipeline. The rear cooling plate 4 is provided with a cooling return groove 38, which is connected to the cooling return hole 29 and the return channel 37. The inner hole 18 of the inner conduit 17 located at one end of the rear cooling plate 4 is connected to the cooling generating device 10 through a pipeline. The cooling generating device 10 inputs the cooling medium 36 into the inner hole 18 of the inner conduit 17 at one end of the rear cooling plate 4, and at the other end, it enters the return channel 37 through the plug return groove 31 of the screw plug 25, and flows back to the cooling generating device 10 through the cooling return groove 38 and the cooling return hole 29.

[0045] like Figure 1 and Figure 7 As shown, the cooling generating device 10 is connected to the threaded end 32 of the inner conduit 17 via the first cooling pipe 8 and the first cooling connector 6. Figure 1 and Figure 3As shown, the cooling generating device 10 is connected to the cooling return hole 29 of the rear cooling plate 4 through the second cooling pipe 9 and the second cooling connector 7, and the cooling medium 36 is stored in the cooling generating device 10.

[0046] The cooling structure of this spiral assembly integrates the flow structure required for the cooling medium to circulate within the cooling channel 16 of the lead screw 15 and onto the stationary rear cooling plate 4. Compared to machining complex flow channels inside the rotating shaft, this structure is simpler and more reliable, solving the problems of difficult dynamic sealing and high machining costs inside the rotating shaft. The cooling medium circulates throughout the entire length of the lead screw 15, resulting in uniform and efficient cooling; it prevents performance failure caused by excessive spiral temperature, and its simple structure facilitates machining and forming.

[0047] like Figure 1 As shown, the rear cooling plate 4 is connected to the lead screw 15 via a bearing 3, preventing the rear cooling plate 4 from rotating with the lead screw 15. The bearing 3 and the lead screw 15 are interference-fitted, with the inner ring of the bearing 3 rotating together with the lead screw 15, while the outer ring of the bearing 3 and the rear cooling plate 4 remain stationary. Using the bearing 3 achieves separation of static and dynamic components, resulting in low frictional resistance, high positioning accuracy, and reliable stable operation of the seal 5 between the stationary rear cooling plate 4 and the rotating lead screw 15, thus extending the seal life.

[0048] like Figure 1 and Figure 3 As shown, the rear cooling plate 4 is equipped with a sealing element 5 connecting the lead screw 15 and the inner conduit 17 to maintain a seal between the cooling return groove 38 and the lead screw 15, and between the inner conduit 17 and the rear cooling plate 4. The sealing element 5 ensures the complete sealing of the cooling circuit from input to return, improving system reliability.

[0049] like Figure 1 As shown, the cooling structure of the screw pair also includes a temperature detection device 19; the lead screw 15 is provided with a lead screw nut 20 that mates with it, and the temperature detection device 19 is installed on the lead screw nut 20 to detect its temperature. Directly measuring the temperature of the lead screw nut 20, which is the core of heat generation and a key component, can most accurately and quickly reflect the actual thermal state of the lead screw 15 pair.

[0050] like Figure 1 As shown, the cooling structure of the screw pair also includes a control system 1, which is electrically connected to the temperature detection device 19 and the cooling generator 10 via signal lines 2. The control system 1 controls the start and stop of the cooling generator 10 based on the temperature detected by the temperature detection device 19. The control system 1 realizes intelligent control of cooling on demand, which not only effectively prevents the lead screw 15 from overheating and ensures motion accuracy, but also avoids the ineffective operation of the cooling system, significantly reduces energy consumption and noise, and extends the life of the cooling system itself.

[0051] like Figure 1As shown, the cooling structure of the spiral pair also includes a support platform 11, a rear fixing plate 14 and a front fixing plate 24. The rear fixing plate 14 and the front fixing plate 24 are respectively mounted on the support platform 11. The rear fixing plate 14 is rotatably connected to one end of the lead screw 15 through the first bearing module 13, and the front fixing plate 24 is rotatably connected to the other end of the lead screw 15 through the second bearing module 23.

[0052] like Figure 1 and Figure 2 As shown, the cooling structure of the spiral pair also includes a motor 26, a synchronous belt 27, a synchronous pulley 12, a load 21, and a sliding support device 22. The sliding support device 22 is fixed on the support platform 11. The lead screw nut 20 is connected to the load 21, and the load 21 can move linearly along the sliding support device 22. The synchronous pulley 12 is fixed on the lead screw 15. The motor 26 is fixed on the rear fixed plate 14 and connected to the synchronous pulley 12 via the synchronous belt 27. The control system 1 controls the rotation of the motor 26 via the signal line 2. The motor 26 drives the lead screw 15 to rotate via the synchronous belt 27 and the synchronous pulley 12. The rotation of the lead screw 15 drives the lead screw nut 20 and the load 21 to move back and forth on the sliding support device 22.

[0053] like Figures 8 to 11 As shown, the second embodiment of the cooling structure of the spiral pair of the present invention differs from the first embodiment in that: the screw plug 25 is replaced with a screw end cap 33, and the screw end cap 33 is provided with an end cap positioning hole 34 to fix the inner guide tube 17; a guide tube return hole 35 is opened at one end of the inner guide tube 17 where the screw end cap 33 is located to connect the inner hole 18 of the inner guide tube 17 and the return channel 37.

[0054] The present invention also discloses a cooling control method for a spiral pair, which, using the cooling structure of the spiral pair of any of the above embodiments, includes the following steps:

[0055] Step 1: The temperature of the lead screw nut 20 is obtained in real time through the temperature detection device 19;

[0056] Step 2: When the detected temperature exceeds the set value T0, the control system 1 starts the cooling generator 10, drives the cooling medium 36 into one end of the inner hole 18 of the inner conduit 17 where the cooling plate 4 is located, and enters the return channel 37 at the other end, and flows back to the cooling generator 10 through the cooling return tank 38 and cooling return hole 29, thus circulating the cooling.

[0057] Step 3: When the temperature is detected to be lower than the set value T0, the control system 1 controls the cooling generator 10 to stop the output of cooling medium.

[0058] The cooling structure and cooling control method of this screw pair can effectively cool the temperature of the lead screw during operation, prevent performance failure caused by excessive screw temperature, and has a simple structure that is easy to process and form, making it suitable for various screw pair motion applications.

[0059] In summary, as described in the specification and figures, this invention has been manufactured into actual samples and tested multiple times. The test results demonstrate that the invention achieves its intended purpose, and its practicality is beyond doubt. The embodiments described above are merely for illustrative purposes and are not intended to limit the scope of the invention. Any equivalent embodiments made by those with common knowledge in the relevant technical field, utilizing the technical content disclosed in this invention without departing from the scope of the technical features and similar features of this invention, based on partial modifications or alterations, are within the protection scope of this invention.

Claims

1. A cooling structure of a helical pair, characterized by: It includes a lead screw (15), an inner guide tube (17), a rear cooling plate (4), a lead screw plug (25), and a cooling generator (10) mounted on a support platform (11). The lead screw (15) is provided with an axially extending cooling channel (16); one end of the lead screw (15) is provided with the rear cooling plate (4), and the other end is provided with the lead screw plug (25) to seal the cooling channel (16). The inner conduit (17) is inserted into the cooling channel (16). One end of the inner conduit (17) is connected to the rear cooling plate (4), and the other end is connected to the screw plug (25). The outer wall of the inner conduit (17) and the inner wall of the cooling channel (16) form a return channel (37). The rear cooling plate (4) is provided with a cooling return hole (29) which is connected to the cooling generating device (10) through a pipeline. The rear cooling plate (4) is provided with a cooling return groove (38) which is connected to the cooling return hole (29) and the return channel (37). The inner conduit (17) is located in the inner hole (18) at one end of the rear cooling plate (4) and is connected to the cooling generating device (10) through a pipeline. The cooling generating device (10) inputs the cooling medium into the inner hole (18) of the inner conduit (17) at one end where the rear cooling plate (4) is located, and into the return channel (37) at the other end, and returns to the cooling generating device (10) through the cooling return tank (38) and cooling return hole (29).

2. The cooling structure of a helical pair according to claim 1, characterized by, The rear cooling plate (4) is connected to the lead screw (15) via a bearing (3), so that the rear cooling plate (4) does not rotate with the lead screw (15).

3. The cooling structure of the spiral pair according to claim 1, characterized in that, The rear cooling plate (4) is provided with a sealing element (5) to connect the lead screw (15) and the inner conduit (17) so that the cooling return groove (38) and the lead screw (15) are sealed together and the inner conduit (17) and the rear cooling plate (4) are sealed together.

4. The cooling structure of the spiral pair according to claim 1, characterized in that, The screw plug (25) is provided with a plug return groove (31) that connects the inner hole (18) of the inner guide tube (17) and the return channel (37).

5. The cooling structure of the spiral pair according to claim 1, characterized in that, The inner conduit (17) has a conduit return hole (35) at one end where the screw plug (25) is located, which connects the inner hole (18) of the inner conduit (17) and the return channel (37).

6. The cooling structure of the spiral pair according to claim 1, characterized in that, It also includes a temperature detection device (19); the lead screw (15) is provided with a lead screw nut (20) that cooperates with it, and the temperature detection device (19) is installed on the lead screw nut (20) to detect its temperature.

7. The cooling structure of the spiral pair according to claim 6, characterized in that, It also includes a control system (1), which is electrically connected to the temperature detection device (19) and the cooling generator (10) respectively, and controls the start and stop of the cooling generator (10) according to the temperature detected by the temperature detection device (19).

8. A cooling control method for a spiral pair, characterized in that, The cooling structure of the spiral pair according to claim 7 includes the following steps: Step 1: The temperature of the lead screw nut (20) is obtained in real time through the temperature detection device (19); Step 2: When the detected temperature exceeds the set value T0, the control system (1) starts the cooling generator (10), drives the cooling medium into the inner hole (18) of the inner conduit (17) at one end where the rear cooling plate (4) is located, and enters the return channel (37) at the other end. It then flows back to the cooling generator (10) through the cooling return tank (38) and cooling return hole (29), thus circulating the cooling. Step 3: When the temperature is detected to be lower than the set value T0, the control system (1) controls the cooling generator (10) to stop the output of the cooling medium.

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