Ball screw dynamic pre-tightening force adjusting device

Abstract

This application relates to the field of ball screw technology, specifically disclosing a dynamic preload adjustment device for a ball screw, including a threaded rod, an externally threaded flange connected to the threaded rod, and a set of balls slidably connected between the threaded rod and the threaded flange. The threaded flange has an internal slide rail structure for adjusting the preload. Through the cooperation of the slide rail structure, the lifting structure, and the blocking structure, the lifting structure can release the obstruction of the through groove, while the blocking structure can seal either the first or second ball slide rail. This allows the balls to switch between the first and second ball slide rails through the through groove, thereby achieving dynamic preload adjustment of the ball screw. This effectively avoids impact and vibration between the balls and the threaded rod and the threaded flange, ensuring the relative position between the threaded rod and the threaded flange, and thus improving the positioning accuracy of the ball screw.

Description

Technical Field

[0001] This application relates to the field of ball screw technology, and more particularly to a dynamic preload adjustment device for ball screws. Background Technology

[0002] A ball screw is a component that uses rolling balls instead of sliding friction. It is a mechanical transmission component whose main function is to convert rotary motion into linear motion. Due to its very low frictional resistance, ball screws are widely used in various industrial equipment and precision instruments. A ball screw mainly consists of a screw and a nut, each with matching helical grooves and rolling balls that roll between these grooves to provide the unique contact between the nut and the screw. The rolling balls in the helical grooves reduce the mechanical contact inside the screw assembly and replace sliding friction with rolling friction. This unique design significantly reduces friction, thereby achieving efficient mechanical motion.

[0003] Traditional ball screws cannot adjust the preload during installation. Tiny gaps exist between the balls, screw, and nut raceways. Under load, these gaps cause impact and vibration between the balls and raceways, accelerating component wear and resulting in significant elastic deformation during force transmission. This leads to displacement deviations in the screw and nut, affecting the overall positioning accuracy of the ball screw. Therefore, we propose a dynamic preload adjustment device for ball screws to solve these problems. Utility Model Content

[0004] This application provides a dynamic preload adjustment device for ball screws, which can adjust the preload of the ball screw, effectively prevent vibration and impact generated by the balls, screw and nut flange, ensure that the position between the balls, screw and nut flange will not deviate, and thus improve the positioning accuracy of the ball screw.

[0005] This application provides a ball screw dynamic preload adjustment device, including a threaded rod, the threaded rod being externally threaded to a threaded flange, and a set of balls being slidably connected between the threaded rod and the threaded flange. The threaded flange is internally provided with a slide rail structure for adjusting the preload, the slide rail structure including a first ball slide rail and a second ball slide rail formed on the inner wall of the threaded flange, the inner diameter of the first ball slide rail being smaller than the inner diameter of the second ball slide rail, and a through groove being formed on the outer surface of the threaded flange, the through groove being connected to the first ball slide rail and the second ball slide rail.

[0006] The threaded flange is externally provided with a lifting structure and a blocking structure for changing the position of the balls.

[0007] Furthermore, the lifting structure includes a stop block slidably connected to the inner wall of the through groove, and a lifting plate is fixedly connected to the upper surface of the stop block.

[0008] Furthermore, the lifting plate is threaded with a bolt, one end of which is threaded with a positioning plate, and the bottom end of the positioning plate is fixedly connected to the outer surface of the threaded flange. The outer surface of the top end of the positioning plate is provided with a threaded hole.

[0009] Furthermore, the blocking structure includes a set of mounting grooves formed on the outer surface of the threaded flange. One end of each set of mounting grooves is connected to the inner wall of the first ball slide rail and the inner wall of the second ball slide rail, respectively. A baffle is slidably connected to the inner wall of each mounting groove.

[0010] Furthermore, each of the baffles has a slidably connected positioning block on its bottom surface. The front end of the positioning block is fixedly connected to the outer surface of the threaded flange. The bottom surface of the positioning block has two sets of mounting holes. Each baffle has a screw threadedly connected to its upper surface. The outer surface of each screw is threadedly connected to the mounting hole, and the bottom end of the screw extends to the bottom of the positioning block.

[0011] Furthermore, each of the baffles has an anti-collision pad fixedly connected to its upper surface.

[0012] Furthermore, the outer surface of the threaded flange is provided with an oil injection hole, which is connected to the first ball bearing slide rail.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] The technical solution provided in this application has at least the following technical effects or advantages:

[0015] 1. By combining the slide rail structure, lifting structure, and blocking structure, the lifting structure can release the closure of the through groove, while the blocking structure can seal either the first or second ball slide rail. This allows the balls to switch between the first and second ball slide rails through the through groove, thereby adjusting the dynamic preload of the ball screw. This effectively avoids impact and vibration between the balls and the threaded rod and threaded flange, ensuring the relative position between the threaded rod and threaded flange, and thus improving the positioning accuracy of the ball screw.

[0016] 2. The anti-collision pads can protect the balls passing over the baffle, preventing minor collisions between the balls and the baffle and preventing damage to the outer surface of the balls, thus avoiding damage to the threaded rod and threaded flange. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the ball screw of this application;

[0018] Figure 2This is a three-dimensional structural schematic diagram of the ball screw in the orthographic section of this application;

[0019] Figure 3 This is a three-dimensional structural schematic diagram of the lifting structure in this application, shown in a cross-sectional view.

[0020] Figure 4 This is a three-dimensional structural schematic diagram of the side sectional view of the threaded flange of this application.

[0021] Figure 5 This is a three-dimensional structural diagram of the barrier structure of this application;

[0022] In the diagram: 1. Threaded rod; 2. Threaded flange; 3. Lifting structure; 301. Stop block; 302. Lifting plate; 303. Bolt; 305. Positioning plate; 306. Threaded hole; 4. Blocking structure; 401. Mounting groove; 402. Baffle; 403. Screw; 404. Mounting hole; 405. Anti-collision pad; 406. Positioning block; 5. Ball bearing; 6. First ball bearing slide rail; 7. Second ball bearing slide rail; 8. Through groove; 9. Oil injection hole. Detailed Implementation

[0023] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0024] Example 1:

[0025] Please see Figures 1-3 In this utility model, a dynamic preload adjustment device for a ball screw includes a threaded rod 1. A threaded flange 2 is externally threaded onto the threaded rod 1. A set of balls 5 are slidably connected between the threaded rod 1 and the threaded flange 2. The threaded flange 2 has an internal slide rail structure for adjusting the preload. The slide rail structure includes a first ball slide rail 6 and a second ball slide rail 7 formed on the inner wall of the threaded flange 2. The inner diameter of the first ball slide rail 6 is smaller than the inner diameter of the second ball slide rail 7. A through groove 8 is formed on the outer surface of the threaded flange 2, and the through groove 8 is connected to the first ball slide rail 6. The ball screw is connected to the first ball slide rail 6 and the second ball slide rail 7. By using the through groove 8 and the cooperation of the first ball slide rail 6 and the second ball slide rail 7, the ball 5 can switch positions with the first ball slide rail 6 and the second ball slide rail 7 through the through groove 8. Since the inner diameter of the first ball slide rail 6 is smaller than the inner diameter of the second ball slide rail 7, it effectively prevents the existence of small gaps between the ball 5, the threaded rod 2 and the threaded flange 1, effectively avoiding the impact and vibration caused by the gaps. It further prevents the deviation between the threaded rod 1 and the threaded flange 2 when the transmitted force is large, thereby effectively improving the positioning accuracy of the entire ball screw.

[0026] The outer surface of the threaded flange 2 is provided with an oil injection hole 9, which is connected to the first ball slide rail 6. Before the equipment is put into use, the operator can inject an appropriate amount of machine oil through the oil injection hole 9. After the machine oil is injected, it will be evenly distributed on the contact surface of the ball 5, the threaded rod 1, and the threaded flange 2, forming a thin oil film. This will further reduce the friction between the ball 5, the threaded rod 1, and the threaded flange 2, making the equipment run more smoothly, reducing energy loss, and improving the overall transmission efficiency.

[0027] Example 2:

[0028] Please see Figures 1-5 The threaded flange 2 is externally provided with a lifting structure 3 and a blocking structure 4 for changing the position of the ball 5. The lifting structure 3 includes a stop block 301 slidably connected to the inner wall of the through groove 8. A lifting plate 302 is fixedly connected to the upper surface of the stop block 301. By utilizing the cooperation between the stop block 301 and the lifting plate 302, the stop block 301 can block the ball 5 inside the through groove 8, allowing the ball 5 to slide stably inside the first ball slide rail 6 or the second ball slide rail 7.

[0029] The lifting plate 302 is threaded with a bolt 303. One end of the bolt 303 is threaded with a positioning plate 305, and the bottom end of the positioning plate 305 is fixedly connected to the outer surface of the threaded flange 2. The outer surface of the top end of the positioning plate 305 is provided with a threaded hole 306. By using the cooperation of the bolt 303, the lifting plate 302 and the positioning plate 305, the lifting plate 302 can be limited when it moves upward with the stop block 301, so as to avoid the need for manual pulling of the lifting plate 302. At the same time, the stop block 301 is released from the seal of the through groove 8, so as to ensure that the ball 5 can switch positions between the first ball slide rail 6 and the second ball slide rail 7 through the through groove 8.

[0030] The blocking structure 4 includes a set of mounting grooves 401 formed on the outer surface of the threaded flange 2. One end of each mounting groove 401 is connected to the inner wall of the first ball slide rail 6 and the inner wall of the second ball slide rail 7, respectively. A baffle 402 is slidably connected to the inner wall of each mounting groove 401. A positioning block 406 is slidably connected to the bottom surface of each baffle 402. The front end of the positioning block 406 is fixedly connected to the outer surface of the threaded flange 2. Two sets of mounting holes 404 are formed on the bottom surface of the positioning block 406. A screw 403 is threadedly connected to the upper surface of each baffle 402. The outer surface of each screw 403 is threadedly connected to the mounting hole 404. Furthermore, the bottom end of the screw 403 extends to the lower part of the positioning block 406. Using the baffle 402 and the mounting groove 401, when switching the ball 5 from the first ball slide rail 6 to the second ball slide rail 7, the baffle 402 can be positioned by the screw 403, the mounting hole 404 and the positioning block 406, which can block the ball 5 and ensure that the ball 5 can pass through the through groove 8 from the first ball slide rail 6 to the second ball slide rail 7. It can also prevent the baffle 402 from vibrating when the ball 5 passes through the baffle 402, and prevent the baffle 402 from being displaced due to vibration. This ensures that the ball 5 can stably switch positions between the first ball slide rail 6 and the second ball slide rail 7 through the through groove 8.

[0031] Each baffle 402 has an anti-collision pad 405 fixedly connected to its upper surface. The anti-collision pad 405 can protect each passing ball 5, avoid minor collisions, prevent damage to the outer surface of the ball 5, prevent damage to the threaded rod 1 and threaded flange 2, and ensure that the ball 5 can slide stably inside the first ball slide rail 6 and the second ball slide rail 7.

[0032] The working principle of this application is:

[0033] When adjusting the preload of the ball screw, first rotate the left screw 403 to gradually disengage it from the positioning block 406, thereby releasing the limiting position of the left baffle 402. Push the left baffle 402 through the mounting groove 401. Then, rotate the screw 403 in the opposite direction to connect the left screw 403 to the corresponding mounting hole 404 below it, thus positioning the left baffle 402 and sealing the first ball slide rail 6. Next, rotate the bolt 303 to disengage it from the positioning plate 305, thereby releasing the limiting position of the stop block 301. Then, pull the lifting plate 302 to connect the bolt 303 to the threaded hole 306, thus fixing the stop block 301. The stop block 301 releases the seal on the through groove 8, and then the threaded rod 1 is rotated, allowing the ball 5 to roll from the first ball slide rail 6 through the through groove 8 into the interior of the second ball slide rail 7. Subsequently, the stop block 301 is reset to restore the seal on the through groove 8. Due to the design that the inner diameter of the first ball slide rail 6 is smaller than the inner diameter of the second ball slide rail 7, the ball screw can achieve precise adjustment of its own dynamic preload, which can effectively prevent the ball 5, threaded rod 1 and threaded flange 2 from vibrating during operation, ensuring that there is no positional offset between the threaded rod 1 and the threaded flange 2, further improving the positioning accuracy of the ball screw, and ensuring the overall stability and reliability of the ball screw operation.

[0034] The above description is merely a preferred embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present application, based on the technical solution and concept of the present application, should be covered within the scope of protection of the present application.

Claims

1. A dynamic preload adjustment device for ball screws, characterized in that: The system includes a threaded rod (1), which is externally threaded to a threaded flange (2). A set of balls (5) are slidably connected between the threaded rod (1) and the threaded flange (2). The threaded flange (2) is internally provided with a slide rail structure for adjusting the preload. The slide rail structure includes a first ball slide rail (6) and a second ball slide rail (7) opened on the inner wall of the threaded flange (2). The inner diameter of the first ball slide rail (6) is smaller than the inner diameter of the second ball slide rail (7). The outer surface of the threaded flange (2) is provided with a through groove (8), and the through groove (8) is connected to the first ball slide rail (6) and the second ball slide rail (7). The threaded flange (2) is provided with a lifting structure (3) and a blocking structure (4) for changing the position of the ball (5).

2. The ball screw dynamic preload adjustment device according to claim 1, characterized in that: The lifting structure (3) includes a stop (301) slidably connected to the inner wall of the through groove (8), and a lifting plate (302) is fixedly connected to the upper surface of the stop (301).

3. The ball screw dynamic preload adjustment device according to claim 2, characterized in that: The lifting plate (302) is threaded with a bolt (303), one end of which is threaded with a positioning plate (305), and the bottom end of the positioning plate (305) is fixedly connected to the outer surface of the threaded flange (2). The outer surface of the top end of the positioning plate (305) is provided with a threaded hole (306).

4. The ball screw dynamic preload adjustment device according to claim 1, characterized in that: The blocking structure (4) includes a set of mounting grooves (401) opened on the outer surface of the threaded flange (2). One end of the set of mounting grooves (401) is connected to the inner wall of the first ball slide rail (6) and the inner wall of the second ball slide rail (7), respectively. Each mounting groove (401) has a baffle (402) slidably connected to its inner wall.

5. The ball screw dynamic preload adjustment device according to claim 4, characterized in that: A set of baffles (402) are slidably connected to the bottom surface of each baffle (402). The front end of the positioning block (406) is fixedly connected to the outer surface of the threaded flange (2). The bottom surface of the positioning block (406) is provided with two sets of mounting holes (404). The upper surface of each baffle (402) is threaded with a screw (403). The outer surface of each screw (403) is threaded to the mounting hole (404), and the bottom end of the screw (403) extends to the bottom of the positioning block (406).

6. The ball screw dynamic preload adjustment device according to claim 4, characterized in that: Each of the baffles (402) has an anti-collision pad (405) fixedly connected to its upper surface.

7. The ball screw dynamic preload adjustment device according to claim 1, characterized in that: The outer surface of the threaded flange (2) is provided with an oil injection hole (9), which is connected to the first ball slide rail (6).

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