Numerically controlled lathe capable of automatically adjusting motor torque error
By introducing a torque sensor and spring adjustment device into the CNC lathe, the motor torque is automatically adjusted, solving the problems of machining accuracy and safety caused by motor torque deviation, and achieving higher machining accuracy and equipment stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-21
- Publication Date
- 2026-03-10
Smart Images
Figure CN223981198U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of CNC lathe technology, and more specifically, to a CNC lathe with automatic adjustment of motor torque error. Background Technology
[0002] In modern manufacturing, CNC lathes are one of the key pieces of equipment for achieving precision machining. As the driving component, the motor's torque output directly affects the machining quality, efficiency, and equipment safety. However, in actual operation, due to factors such as load variations and wear, the actual torque output of the motor often deviates from the set value. This deviation can lead to decreased machining accuracy, or even equipment malfunction or damage. Utility Model Content
[0003] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a CNC lathe with automatic adjustment of motor torque error to solve the above-mentioned shortcomings.
[0004] To achieve the above objectives, the technical solution provided by this utility model is as follows:
[0005] This utility model discloses a CNC lathe with automatic adjustment of motor torque error, comprising a CNC lathe body, a drive motor mounted on the CNC lathe body, a spring adjustment device mounted on the output end of the drive motor, a torque sensor mounted on the lower end of the spring adjustment device, and a lathe load component mounted on the lower end of the torque sensor. The lathe load component rotates under the operation of the drive motor to process the workpiece on the CNC lathe body. The torque sensor directly measures the actual torque output of the drive motor acting on the lathe load component. The spring adjustment device includes a first thrust plate, a second thrust plate, a third thrust plate, a fourth thrust plate, a first helical spring, a second helical spring, a disc spring, and an electric telescopic rod. The electric telescopic rod is connected in series with the first thrust plate, the first helical spring, the second thrust plate, the second helical spring, the third thrust plate, and the fourth thrust plate. A disc spring is arranged between the third thrust plate and the fourth thrust plate.
[0006] Preferably, the CNC lathe body is equipped with a signal processing unit to receive signals from the torque sensor and convert them into digital signals for processing. At the same time, the CNC lathe body is equipped with an error calculation module to calculate the torque error based on the difference between the set theoretical torque value and the actual measured torque value, and control the spring adjustment device to perform automatic adjustment.
[0007] Preferably, the first helical spring connects the first thrust plate and the second thrust plate, the second helical spring connects the second thrust plate and the third thrust plate, and the electric telescopic rod adjusts the distance between the first thrust plate and the fourth thrust plate to change the degree of spring compression, thereby adjusting the preload.
[0008] Preferably, the first thrust plate is connected to the output end of the drive motor via a flange. The lower surface of the first thrust plate is provided with first guide rods at equal intervals, and the upper surface of the third thrust plate is provided with second guide rods. The second guide rods and the first guide rods are staggered, and the second thrust plate is provided with movable holes that match the second guide rods and the first guide rods. The second guide rods and the first guide rods play a guiding role and connect the first thrust plate, the second thrust plate and the third thrust plate into an integral structure.
[0009] Preferably, the first helical spring and the second helical spring are two helical springs with different stiffnesses, and the electric telescopic rod is connected in series with both the first helical spring and the second helical spring.
[0010] Preferably, the upper surface of the fourth thrust plate is provided with a guide protrusion, which is sleeved with a butterfly spring. The butterfly springs are distributed in a matrix and have the same stiffness. This parallel connection allows the butterfly springs to bear the same force at the same time, but their displacements will be consistent according to their equal stiffness.
[0011] Compared with the prior art, the technical solution provided by this utility model has the following advantages:
[0012] This invention relates to a CNC lathe with automatic motor torque error adjustment. It monitors motor torque in real time using a torque sensor and automatically adjusts the torque using a spring adjustment device. This ensures the stability of the cutting force, reduces dimensional errors caused by torque fluctuations, and significantly improves machining accuracy. It can dynamically adjust the preload according to the shape and material of different workpieces to ensure optimal cutting results. Suitable for various machining tasks, the spring adjustment device absorbs vibration and impact, protecting the motor and other transmission components from damage, improving the overall stability of the system, reducing the need for manual intervention, and lowering maintenance costs and workload. The electric telescopic rod design makes preload adjustment more convenient, enabling rapid response to controller commands and instant torque adjustment, shortening adjustment time and improving production efficiency. Attached Figure Description
[0013] Figure 1 This is a structural diagram of the CNC lathe with automatic motor torque error adjustment according to the present invention.
[0014] Figure 2 This is a structural diagram showing the connection between the spring adjusting device and the torque sensor of this utility model.
[0015] Figure 3 For the present utility model Figure 2 Exploded view;
[0016] Figure 4 For the present utility model Figure 2 Sectional view.
[0017] In the diagram: 1. CNC lathe body; 11. Drive motor; 2. Spring adjustment device; 21. First thrust plate; 211. First guide rod; 22. Second thrust plate; 221. Movable hole; 23. Third thrust plate; 231. Second guide rod; 24. Fourth thrust plate; 241. Guide protrusion; 25. First helical spring; 26. Second helical spring; 27. Disc spring; 28. Electric telescopic rod; 3. Torque sensor; 4. Lathe load components. Detailed Implementation
[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0019] To further understand the content of this utility model, a detailed description of this utility model will be provided in conjunction with the accompanying drawings.
[0020] Combination Figures 1-4 This utility model discloses a CNC lathe with automatic adjustment of motor torque error, comprising a CNC lathe body 1, a drive motor 11 mounted on the CNC lathe body 1, a spring adjustment device 2 mounted on the output end of the drive motor 11, a torque sensor 3 mounted on the lower end of the spring adjustment device 2, and a lathe load component 4 mounted on the lower end of the torque sensor 3. The lathe load component 4 rotates under the operation of the drive motor 11 to process the workpiece on the CNC lathe body 1. The torque sensor 3 directly measures the actual torque output of the drive motor 11 acting on the lathe load component 4. A signal processing unit is set on the CNC lathe body 1 to receive the signal from the torque sensor 3 and convert it into a digital signal for processing. An error calculation module is configured to calculate the torque error based on the difference between the set theoretical torque value and the actual measured torque value, and control the spring adjustment device 2 to perform automatic adjustment.
[0021] The spring adjustment device 2 includes a first thrust plate 21, a second thrust plate 22, a third thrust plate 23, and a fourth thrust plate 24 arranged in parallel from top to bottom, a first helical spring 25 disposed between the first thrust plate 21 and the second thrust plate 22, a second helical spring 26 disposed between the second thrust plate 22 and the third thrust plate 23, and a butterfly spring 27 disposed between the third thrust plate 23 and the fourth thrust plate 24. It also includes an electric telescopic rod 28 connecting the first thrust plate 21 and the fourth thrust plate 24. The electric telescopic rod 28 adjusts the distance between the first thrust plate 21 and the fourth thrust plate 24, changes the degree of spring compression, and thus adjusts the preload.
[0022] The first thrust plate 21 is connected to the output end of the drive motor 11 via a flange. The lower surface of the first thrust plate 21 is provided with first guide rods 211 at equal intervals. The upper surface of the third thrust plate 23 is provided with second guide rods 231. The second guide rods 231 and the first guide rods 211 are staggered. The second thrust plate 22 is provided with movable holes 221 that match the second guide rods 231 and the first guide rods 211. The second guide rods 231 and the first guide rods 211 serve as guides and connect the first thrust plate 21, the second thrust plate 22 and the third thrust plate 23 into an integral structure. The first thrust plate 21, the second thrust plate 22 and the third thrust plate 23 are respectively provided with mounting grooves that match the first helical spring 25 or the second helical spring 26 for fixing the ends of the first helical spring 25 or the second helical spring 26.
[0023] The first helical spring 25 and the second helical spring 26 are two helical springs with different stiffnesses. The electric telescopic rod 28 is connected in series with the first helical spring 25 and the second helical spring 26. This series connection allows the two springs to bear the same displacement in turn, but their respective forces will differ according to their different stiffnesses. The total preload is the superposition of the forces of the two springs, thereby providing a larger maximum output force.
[0024] The upper surface of the fourth thrust plate 24 is provided with guide protrusions 241, which are sleeved with butterfly springs 27. The butterfly springs 27 are distributed in a matrix and have the same stiffness. This parallel connection allows the butterfly springs 27 to bear the same force at the same time, but their displacements will be consistent according to their equal stiffness. The total deformation is many times that of a single spring, thereby expanding the adjustment range and adapting to different torque requirements.
[0025] The combination of helical springs and disc springs 27 ensures effective force transmission while providing greater adjustment flexibility and higher response speed. The helical springs provide a larger initial preload, while the disc springs 27 can be finely adjusted within a smaller displacement range. In addition, when the torque sensor 3 detects that the actual torque is lower than the set value, the controller will issue a command to increase the preload of the electric telescopic rod 28. Conversely, if the actual torque is too high, the preload will be reduced. In this way, a constant cutting force can be dynamically maintained, regardless of the shape or material of the workpiece.
[0026] Working process: The operator starts the CNC lathe, and the drive motor 11 starts working, driving the lathe load component 4 to rotate, preparing to process the workpiece on the CNC lathe body 1. The distance between the first thrust plate 21 and the fourth thrust plate 24 is adjusted by the electric telescopic rod 28, and the initial preload of the spring adjustment device 2 is set. This preload is preset according to the expected processing conditions. During the processing, the torque sensor 3 monitors the actual torque output of the drive motor 11 acting on the lathe load component 4 in real time and sends the analog signal to the signal processing unit. The signal processing unit receives the analog signal from the torque sensor 3, performs necessary signal conditioning and analog-to-digital conversion, and converts the analog signal into digital signal. The signal is sent for subsequent processing. Based on the calculated torque error, the controller generates corresponding adjustment commands. According to the adjustment commands issued by the controller, the electric telescopic rod 28 adjusts the distance between the first thrust plate 21 and the fourth thrust plate 24, changes the degree of spring compression, and thus adjusts the preload. When the actual torque is lower than the set value, the electric telescopic rod 28 shortens, increases the pressure between the first thrust plate 21 and the fourth thrust plate 24, and further compresses the helical spring and the disc spring 27 to provide a greater preload. When the actual torque is higher than the set value, the electric telescopic rod 28 extends, reduces the pressure between the first thrust plate 21 and the fourth thrust plate 24, relaxes the helical spring and the disc spring 27, and reduces the preload.
[0027] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.
[0028] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention.
Claims
1. A numerical control lathe with automatic adjustment of motor torque error, comprising a numerical control lathe main body (1), characterized in that: The numerical control lathe body (1) is provided with a driving motor (11), the output end of the driving motor (11) is provided with a spring adjusting device (2), the lower end of the spring adjusting device (2) is provided with a torque sensor (3), the lower end of the torque sensor (3) is provided with a lathe load component (4), the spring adjusting device (2) comprises a first thrust disc (21), a second thrust disc (22), a third thrust disc (23), a fourth thrust disc (24), a first spiral spring (25), a second spiral spring (26), a butterfly spring (27) and an electric telescopic rod (28), the electric telescopic rod (28) is sequentially connected with the first thrust disc (21), the first spiral spring (25), the second thrust disc (22), the second spiral spring (26), the third thrust disc (23) and the fourth thrust disc (24), and the butterfly spring (27) is arranged between the third thrust disc (23) and the fourth thrust disc (24).
2. The motor torque error auto-adjusting CNC lathe of claim 1, wherein: The numerical control lathe body (1) is provided with a signal processing unit, which receives signals from the torque sensor (3) and converts them into digital signals for processing, and is provided with an error calculation module, which calculates the torque error according to the difference between the set theoretical torque value and the actually measured torque value, and controls the spring adjusting device (2) to automatically adjust.
3. The motor torque error auto-adjusting CNC lathe of claim 1, wherein: The first spiral spring (25) is connected between the first thrust disc (21) and the second thrust disc (22), and the second spiral spring (26) is connected between the second thrust disc (22) and the third thrust disc (23).
4. The motor torque error auto-adjusting CNC lathe of claim 1, wherein: The first thrust disc (21) is connected with the output end of the driving motor (11) through a flange, and the lower surface of the first thrust disc (21) is provided with first guide rods (211) at equal distances, the upper surface of the third thrust disc (23) is provided with second guide rods (231), the second guide rods (231) and the first guide rods (211) are arranged in a staggered manner, and the second thrust disc (22) is provided with movable holes (221) matched with the second guide rods (231) and the first guide rods (211).
5. The motor torque error auto-adjusting CNC lathe of claim 1, wherein: The first spiral spring (25) and the second spiral spring (26) are two spiral springs with different stiffness.
6. The motor torque error auto-adjusting CNC lathe of claim 1, wherein: The upper surface of the fourth thrust disc (24) is provided with guide protrusions (241), the guide protrusions (241) are sleeved with the butterfly springs (27), the butterfly springs (27) are distributed in a matrix shape, and the stiffness of the butterfly springs (27) is the same.