Ball screw capable of preventing clamping stagnation of return pipe

Abstract

The invention belongs to the technical field of ball screws, and particularly relates to a ball screw with a detachable backflow system. The ball screw comprises a screw body (1), a nut (2) coaxially connected with the screw body in a sleeved mode and balls (3) rolling between the screw body (1) and the nut (2), a roller path (4) is formed between threads of the nut (2) and threads of the screw body, the backflow pipe (5) is arranged outside the nut (2), and the two ends of the backflow pipe (5) are inserted into the nut (2) to be connected with the roller path (4). A tongue plate (501) is arranged at the tail end of the return pipe (5) and extends into the roller path (4), the thicknesses of the tongue plate (501) in all positions of the roller path (4) are different, and the thickness of the tail end of the tongue plate (501) is the thinnest; and the ball (3) rolls between the raceway (4) and the return pipe (5) through the tongue plate (501). Compared with the prior art, the invention is beneficial to reducing the blockage of the balls and improving the transmission efficiency.

Description

Technical Field

[0001] This invention belongs to the field of ball screw technology, specifically relating to a detachable ball screw for a recirculation system. Background Technology

[0002] A ball screw is a transmission element that converts rotary motion into linear motion. It consists of a screw shaft, a nut, and circulating balls. By rolling the balls between the screw and nut threads, rolling friction replaces sliding friction, thus improving transmission efficiency.

[0003] However, existing external circulation ball screws have many drawbacks, such as easy jamming at the interface between the raceway and the return pipe, leading to problems like transmission vibration, abnormal noise, and ball damage; difficulty in disassembling and assembling the return pipe, resulting in high maintenance costs and long maintenance times; and degradation of dynamic response performance, affecting the positioning accuracy and service life of the equipment. Although attempts have been made to improve the situation through methods such as manual grinding of the interface, enhanced lubrication, and optimization of the return pipe structure, these solutions still have limitations such as poor consistency, high-temperature failure, and large space occupation, and cannot completely solve the jamming problem. Summary of the Invention

[0004] (a) Technical problems to be solved The purpose of this invention is to provide a ball screw with anti-jamming backflow tube to solve at least one of the above-mentioned problems, thereby solving the problems of backflow tube jamming and difficult disassembly and maintenance in the prior art, and achieving the effect of reducing ball jamming and improving transmission efficiency.

[0005] (II) Technical Solution The objective of this invention is achieved through the following technical solution: One of the technical solutions of the present invention is to provide a ball screw for preventing jamming of the return pipe. The ball screw includes a screw, a nut coaxially sleeved with the screw, and balls rolling between the screw and the nut. A raceway is formed between the thread of the nut and the thread of the screw. A return pipe is provided outside the nut. Both ends of the return pipe are inserted into the nut and connected to the raceway. The return pipe has a tongue plate extending into the raceway at its end. The tongue plate has a different thickness throughout the raceway, with the thinnest thickness at the end. The ball rolls between the raceway and the return pipe via the tongue plate. The varying thickness of the tongue plate throughout the raceway, with the thinnest thickness at the end, effectively eliminates the geometric abrupt changes at the interface between the raceway and the return pipe.

[0006] Furthermore, the tongue plate is configured as a gradually thickening tongue plate, with the thickness at the end of the tongue plate being less than the thickness of the return pipe.

[0007] Furthermore, the thickness at the very end of the tongue plate is less than or equal to 0.25 times the diameter of the ball bearing, and the thickness at the connection between the tongue plate and the return pipe is 0.4 to 0.5 times the diameter of the ball bearing.

[0008] The thickness of the tongue plate at its very end is set to be less than or equal to 0.25 times the diameter of the ball. This ensures that the ball maintains an appropriate gap between itself and the tongue plate in the transition area. This prevents the ball from becoming unstable due to an excessively large gap, and also prevents excessive friction or collision between the ball and the tongue plate due to an excessively small gap. A moderate gap facilitates smooth ball rolling while reducing energy loss and wear.

[0009] The thickness of the connection between the tongue plate and the return pipe is set to 0.4-0.5 times the diameter of the ball. This ensures that the tongue plate has sufficient strength and rigidity, while not causing excessive obstruction to the movement of the ball. The thicker connection can withstand the pressure and friction generated by the ball during transition, ensuring a stable connection between the tongue plate and the return pipe and avoiding deformation or damage caused by an excessively thin connection, thereby extending the service life of the tongue plate.

[0010] Furthermore, the tongue plate extends obliquely into the raceway, with its inclination angle matching that of the thread on the nut. When the inclination angle of the tongue plate matches that of the thread, the balls can roll along a more natural helical trajectory during the transition between the raceway and the return tube, minimizing abrupt changes in ball direction during rolling. This avoids jamming or uneven wear caused by sudden changes in direction, and also makes the balls enter and exit the tongue plate more smoothly, reducing additional resistance caused by changes in direction.

[0011] Furthermore, the tongue plate surface is coated with a high-strength wear-resistant coating.

[0012] Furthermore, the high-strength wear-resistant coating includes ceramic coatings, cermet coatings, and nanocomposite coatings, specifically including TiC coatings, titanium-based cermet coatings, nano-TiN coatings, and WC-Co coatings. Among these, WC-Co coating is a widely used coating technology. The WC phase possesses high hardness and high wear resistance, while the Co phase acts as a binder, giving the coating a certain strength and toughness. Due to its excellent resistance to sliding wear, abrasive wear, fretting wear, and erosion wear, WC-Co coating has been widely used as a protective layer for wear-resistant parts in industries such as aerospace and automotive.

[0013] Furthermore, a grease injection hole is provided on the outside of the reflux pipe.

[0014] Furthermore, a vibration sensor is installed on the outside of the return pipe, and the vibration sensor is electrically connected to the grease injection port. During the use of the ball screw, if the rolling friction of the balls is too high, it will cause the return pipe to vibrate. After the vibration sensor captures the signal, it triggers the lubricating grease injection device in the grease injection port to inject grease into the rolling area of ​​the balls, thereby reducing the friction between the balls and the raceways, ensuring smooth operation of the ball screw, and extending its service life.

[0015] Furthermore, a connecting pipe is installed in the middle section of the reflux pipe, and tongue plates are installed at both ends of the connecting pipe.

[0016] Furthermore, a fixing structure is provided at both ends of the connecting pipe that contact the outer periphery of the nut to fix the return pipe to the outer periphery of the nut.

[0017] Furthermore, the fixing structure can be quickly disassembled, and is configured as a quick-release flange connection structure. The quick-release structure makes the reflux pipe easy to install and remove, requiring no maintenance for replacement, while also reducing the processing difficulty of the reflux pipe and tongue plate, and improving production efficiency.

[0018] Furthermore, the flange connection surface is equipped with double O-ring seals.

[0019] (III) Beneficial Effects Compared with the prior art, the present invention has the following advantages: (1) This invention addresses the problem of jamming at the interface between the raceway and the return pipe in existing external circulation ball screws. By setting a tongue plate between the return pipe and the raceway, and designing the tongue plate with a gradually changing thickness from thick to thin, the geometric abrupt changes in the traditional structure are reduced, ensuring that the balls can roll smoothly in the transition area between the raceway and the return pipe, and reducing the possibility of the balls jamming at this interface. At the same time, this invention also applies a nano-composite coating to the surface of the tongue plate. This high-performance coating can significantly reduce the wear and jamming phenomenon of the tongue plate, thereby making the ball screw run more smoothly during operation and effectively improving the operating efficiency and stability of the equipment.

[0020] (2) The return pipe and the nut in this invention are connected by inserting a tongue plate and fixing the structure, which makes the return pipe easy to disassemble and assemble, resulting in a flange quick-release return system. The return pipe is easy to disassemble and assemble, and the return pipe can be replaced without maintenance. This disassembleable design also greatly reduces the processing difficulty of the return pipe and the tongue plate, and significantly improves the production efficiency. This invention can be flexibly matched with ball screws of different specifications to meet the diverse needs of different industries and fields.

[0021] (3) The present invention sets a grease injection hole in the return pipe and installs a vibration sensor connected to the grease injection hole. In the subsequent use of the ball screw, if the ball encounters excessive friction during rolling, this friction will cause the return pipe to vibrate to a certain extent. The vibration sensor captures this vibration signal and triggers the lubricating grease injection device in the grease injection hole. The lubricating grease is then injected into the rolling area of ​​the ball, thereby effectively reducing the friction between the ball and the raceway, ensuring the smooth operation of the ball screw, and extending the service life of the ball screw.

[0022] (4) The present invention has a simple structure, is easy to operate and easy to assemble. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of a ball screw for preventing jamming of the return pipe according to the present invention; In the diagram: 1-lead screw; 2-nut; 3-ball bearing; 4-raceway; 5-return pipe; 501-tongue plate; 502-connecting pipe; 503-fixed structure; 504-grease injection hole. Detailed Implementation

[0025] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0026] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0027] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this application, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0028] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. The drawings only show the components related to this application and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0029] Additionally, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that practice can be carried out without these specific details.

[0030] The technical solutions provided by the various embodiments of this application are described below with reference to the accompanying drawings. Example 1

[0031] See Figure 1 The present invention provides a ball screw for preventing jamming of the return pipe. The ball screw includes a screw 1, a nut 2 coaxially sleeved with the screw, and balls 3 rolling between the screw 1 and the nut 2. A raceway 4 is formed between the thread of the nut 2 and the thread of the screw. A return pipe 5 is provided outside the nut 2. Both ends of the return pipe 5 are inserted into the nut 2 and connected to the raceway 4.

[0032] A connecting pipe 502 is installed in the middle section of the return pipe 5, and tongue plates 501 are installed at both ends of the connecting pipe 502. A fixing structure 503 is installed at both ends of the connecting pipe 502 that contacts the outer periphery of the nut 2. The fixing structure 503 is a quick-release flange connection structure that fixes the return pipe 5 to the outer periphery of the nut 2.

[0033] The end of the return pipe 5 is provided with a tongue plate 501 that extends into the raceway 4. The thickness of the tongue plate 501 varies at different points inside the raceway 4, with the thinnest thickness at the end. The tongue plate 501 is designed as a gradually thickening tongue plate, with the thickness at the end of the tongue plate 501 being less than the thickness of the return pipe 5. The thickness of the very end of the tongue plate 501 is 0.1 times the diameter of the ball bearing, and the thickness at the connection between the tongue plate 501 and the return pipe 5 is 0.4 times the diameter of the ball bearing. The tongue plate 501 extends obliquely into the raceway 4, and its inclination angle is consistent with the inclination angle of the thread on the nut 2.

[0034] Tongue plate 501 surface coated with WC-Co nano-coating The reflux pipe 5 is provided with a grease injection hole 504 and a vibration sensor on the outside, and the vibration sensor is electrically connected to the grease injection hole 504.

[0035] The ball 3 rolls between the raceway 4 and the return pipe 5 via the tongue plate 501.

[0036] The same or similar parts between the various embodiments in this specification can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments.

[0037] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A ball screw with anti-jamming reflux tube, characterized in that, The ball screw includes a screw (1), a nut (2) coaxially sleeved with the screw, and balls (3) rolling between the screw (1) and the nut (2). A raceway (4) is formed between the thread of the nut (2) and the thread of the screw. A return pipe (5) is provided on the outside of the nut (2). Both ends of the return pipe (5) are inserted into the nut (2) and connected to the raceway (4). The end of the return pipe (5) is provided with a tongue plate (501) that extends into the raceway (4). The tongue plate (501) has different thicknesses at different points inside the raceway (4), and the thickness at the end of the tongue plate (501) is the thinnest. The ball (3) rolls between the raceway (4) and the return pipe (5) through the tongue plate (501).

2. The ball screw for preventing jamming of the return pipe according to claim 1, characterized in that, The tongue plate (501) is configured as a gradually thickened tongue plate, and the thickness at the end of the tongue plate (501) is less than the thickness of the return pipe (5).

3. The ball screw for preventing jamming of the return pipe according to claim 1, characterized in that, The thickness of the tongue plate (501) at its very end is less than or equal to 0.25 times the diameter of the ball bearing, and the thickness at the connection between the tongue plate (501) and the return pipe (5) is 0.4 to 0.5 times the diameter of the ball bearing.

4. The ball screw for preventing jamming of the return pipe according to claim 1, characterized in that, The tongue plate (501) extends obliquely into the raceway (4), and its inclination angle is consistent with the inclination angle of the thread on the nut (2).

5. The ball screw for preventing jamming of the return pipe according to claim 1, characterized in that, The tongue plate (501) is coated with a high-strength wear-resistant coating.

6. The ball screw for preventing jamming of the return pipe according to claim 1, characterized in that, The reflux pipe (5) is provided with a grease injection hole (504) on the outside.

7. The ball screw for preventing jamming of the return pipe according to claim 6, characterized in that, A vibration sensor is installed on the outside of the return pipe (5), and the vibration sensor is electrically connected to the grease injection hole (504).

8. The ball screw for preventing jamming of the return pipe according to claim 1, characterized in that, A connecting pipe (502) is installed in the middle section of the return pipe (5), and tongue plates (501) are installed at both ends of the connecting pipe (502).

9. The ball screw for preventing jamming of the return pipe according to claim 8, characterized in that, A fixing structure (503) is provided at both ends of the connecting pipe (502) that contacts the outer periphery of the nut (2) to fix the return pipe (5) to the outer periphery of the nut (2).

10. The ball screw for preventing jamming of the return pipe according to claim 9, characterized in that, The fixing structure (503) can be quickly disassembled and is configured as a quick-release flange connection structure.

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