Double-helix differential precise feeding lathe tailstock structure

Abstract

The invention discloses a double-helix differential precise feeding lathe tailstock structure, and belongs to the technical field of numerical control lathes, the double-helix differential precise feeding lathe tailstock structure comprises a supporting seat, a planetary gear driving device, an internal and external double-thread feeding device and a jacking force retaining device, the supporting seat is vertically arranged, the planetary gear driving device is arranged on the supporting seat, and the internal and external double-thread feeding device is arranged on the jacking force retaining device. The planetary gear driving device is in running fit with the supporting seat, the internal and external double-thread feeding device is arranged on the planetary gear driving device, the jacking force retaining device is arranged beside the internal and external double-thread feeding device, and the jacking force retaining device is in sliding fit with the internal and external double-thread feeding device. By means of the differential transmission design of the inner thread and the outer thread and the cooperation of the planetary gear driving device, the inner thread sleeve and the outer thread sleeve rotate reversely to form differential feeding, the thread pitch difference value is controlled to be 0.1-0.2 mm, the feeding resolution is improved to 0.01 mm, compared with a traditional structure, the precision is remarkably improved, and the problems of workpiece machining size deviation, form and location tolerance out-of-tolerance and the like are effectively avoided.

Description

Technical Field

[0001] This invention relates to the field of CNC lathe technology, and in particular to the tailstock structure of a double-helix differential precision feed lathe. Background Technology

[0002] In the field of metal cutting, the tailstock of a lathe, as one of the core functional components, is mainly used to support the workpiece (especially slender shafts and precision shaft parts), and to install centers to achieve axial positioning and clamping of the workpiece. Its feed accuracy and clamping force stability directly determine the dimensional accuracy, geometric tolerances, and surface quality of the workpiece, making it a key link in ensuring the quality of precision machining. With the rapid development of modern machinery manufacturing towards precision and high-end, the aerospace, precision instrument, and medical device fields have increasingly stringent requirements for the machining accuracy of shaft parts, placing higher standards on the performance of lathe tailstocks.

[0003] Currently, most traditional lathe tailstocks on the market employ a single-helix feed mechanism. Its core structure consists of a handwheel, a single-threaded sleeve, a center spindle, and a tailstock housing. The feed motion is achieved by rotating the handwheel, which drives the single-threaded sleeve to move relative to the tailstock housing via a threaded motion. This, in turn, drives the center spindle to achieve axial feed, completing the clamping and positioning of the workpiece. This type of single-helix feed structure is simple in design and low in manufacturing cost, and is widely used in machining ordinary precision parts. However, in precision machining and machining of slender shafts, its inherent structural defects are becoming increasingly apparent, making it difficult to meet actual machining requirements.

[0004] First, the positioning accuracy of traditional single-screw feed mechanisms is relatively low. Because single-threaded sleeves use a single-pitch design, the pitch is typically large, limiting the feed resolution. Furthermore, issues such as thread backlash, tooth surface wear, and assembly errors inevitably arise during thread transmission, resulting in poor axial feed accuracy of the mandrel and an inability to achieve precise control of minute feed amounts. In actual machining, its feed resolution typically only reaches 0.1 mm or slightly above, failing to meet the stringent positioning accuracy requirements of precision shaft parts and easily causing quality problems such as workpiece dimensional deviations and out-of-tolerance geometrical tolerances.

[0005] Secondly, the unstable clamping force during the machining of slender shafts poses significant safety and quality risks. Traditional tailstock clamping force control often uses ordinary cylindrical springs for pre-tensioning. These springs are prone to fatigue deformation after prolonged use, leading to a gradual decrease in clamping force. Simultaneously, the lack of a reliable self-locking anti-reverse mechanism means that under cutting forces, vibrations, and other external forces, the threaded sleeve is prone to retraction, causing axial displacement of the center mandrel and resulting in excessive fluctuations in clamping force. During the machining of slender shafts, excessive clamping force can cause workpiece bending and deformation, affecting machining straightness; insufficient clamping force can cause workpiece positioning to loosen, generating cutting vibrations. This not only reduces the surface finish of the workpiece but may also cause the workpiece to fly out, leading to safety accidents. Summary of the Invention

[0006] This invention provides a tailstock structure for a double-helix differential precision feed lathe to solve the aforementioned technical problems.

[0007] The present invention adopts the following technical solution: a tailstock structure for a double-helix differential precision feed lathe, including a support base, a planetary gear drive device, an internal and external double-thread feed device, and a clamping force holding device. The support base is vertically arranged, the planetary gear drive device is mounted on the support base, and the planetary gear drive device and the support base are rotatably engaged. The internal and external double-thread feed device is mounted on the planetary gear drive device, and the clamping force holding device is located beside the internal and external double-thread feed device, and the clamping force holding device and the internal and external double-thread feed device are slidably engaged.

[0008] Furthermore, the planetary gear drive device includes an internal gear ring disk, a sun gear, a planet carrier, and planet gears. The internal gear ring disk is rotatably connected to a support base. There are three planet gears, which mesh with the internal gear ring disk. The planet carrier is connected to the three planet gears. A rotating shaft is provided on the planet carrier, and the rotating shaft is rotatably connected to the support base. A handwheel is provided on the rotating shaft. A rotating shaft is provided on the sun gear, and the sun gear is rotatably connected to the internal gear ring disk through the rotating shaft. The sun gear meshes with the three planet gears.

[0009] Furthermore, the handwheel adopts a circular structure with anti-slip texture on its surface, and a precision scale with a resolution of 0.001mm is provided on the edge of the handwheel, matching the feed resolution. Furthermore, the internal and external double thread feed device includes an internal thread sleeve, an external thread sleeve, a center mandrel, and a tailstock housing. The internal thread sleeve is threaded inside the external thread sleeve. The internal thread sleeve (31) is connected to the rotating shaft. The external thread sleeve is connected to the outer wall of the internal gear ring. The center mandrel is provided with a connecting shaft. The internal thread sleeve is provided with an insertion hole. The insertion hole is provided with a first threaded section. The connecting shaft is provided with a second threaded section. The first threaded section and the second threaded section are threadedly connected. One end of the tailstock housing is threaded to the external thread sleeve, and the other end of the tailstock housing is connected to a lathe.

[0010] Furthermore, the clamping force retaining device includes a butterfly spring assembly and a wedge self-locking assembly, wherein the butterfly spring assembly is connected to the connecting shaft, and the wedge self-locking assembly is slidably connected to the connecting shaft.

[0011] Furthermore, the disc spring assembly includes a base, a disc spring assembly, and a mounting plate. The mounting plate is connected to the side wall of the connecting shaft, the base is horizontally mounted on the lathe, and the two ends of the disc spring assembly are respectively connected to the base and the mounting plate.

[0012] Furthermore, the wedge-shaped self-locking assembly includes a bracket, a drive motor, a wedge block, a drive screw shaft, a sliding plate, and two sliding rods. The bracket is vertically mounted on the lathe, the drive motor is located on the bracket, the top of the drive screw shaft is connected to the main shaft of the drive motor, the two sliding rods are symmetrically connected to the bracket, the sliding plate slides with the two sliding rods, the sliding plate is threadedly connected to the drive screw shaft, the wedge block is connected to the bottom of the sliding rods, the wedge block has two sliding grooves, the connecting shaft has an inclined groove, and the connecting shaft has a slider that slides with the two sliding grooves.

[0013] Furthermore, the disc spring assembly is equipped with a pressure sensor.

[0014] The above-described at least one technical solution adopted in the embodiments of the present invention can achieve the following beneficial effects: Firstly, this invention significantly improves positioning accuracy, completely solving the problem of large positioning deviation in traditional single-spiral tailstocks. In the background technology, traditional single-spiral feed mechanisms have large pitch, low feed resolution, and problems such as thread clearance and tooth surface wear, making it impossible to achieve micro-feed control and difficult to meet the needs of precision machining.

[0015] This solution uses a differential transmission design with internal and external double threads, combined with a planetary gear drive device, to make the internal and external threaded sleeves rotate in opposite directions to form differential feed. The pitch difference is controlled within 0.1 to 0.2 mm, and the feed resolution is improved to 0.01 mm. This significantly improves the accuracy compared to the traditional structure and effectively avoids problems such as workpiece machining dimensional deviation and out-of-tolerance form and position.

[0016] Secondly, this invention stabilizes the clamping force and reliably prevents backlash, thus addressing safety and quality concerns in the machining of slender shafts. Traditional tailstocks use ordinary cylindrical springs for pre-tensioning, which are prone to fatigue deformation leading to clamping force attenuation. Furthermore, they lack a reliable self-locking mechanism, making them susceptible to backlash under external forces, causing workpiece bending, vibration, or even ejection. This solution, through a combination of a butterfly spring assembly, a wedge-shaped self-locking assembly, and a pressure sensor, controls the clamping force fluctuation within ±5%. The butterfly spring's high fatigue resistance prevents clamping force attenuation, the wedge-shaped self-locking mechanism resists external forces such as cutting vibration, and the pressure sensor enables real-time monitoring of the clamping force. This comprehensive approach ensures the stability and safety of slender shaft machining, improving workpiece surface quality and machining pass rate.

[0017] Thirdly, this invention enhances the structural versatility and practicality, reduces usage and maintenance costs, and adapts to the demands of industrialized batch precision machining. Traditional tailstock structures suffer from dispersed configurations, high power transmission losses, poor adaptability, and inconvenient maintenance, making them unsuitable for upgrading existing lathes and meeting diverse machining needs. This solution adopts a modular and compact design, with smooth integration of functional components, allowing direct installation on existing lathes without requiring modifications to the lathe body, thus demonstrating strong versatility. Planetary gear drive simplifies the operation process, and the modular design facilitates later maintenance, repair, and component replacement, significantly reducing equipment maintenance costs and operator workload. It also balances machining efficiency and precision, practicality and economy, adapting to the trend of precision and high-end development in modern mechanical manufacturing. Attached Figure Description

[0018] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 2 ; Figure 3 This is a three-dimensional structural diagram of the planetary gear drive device in this invention. Figure 1 ; Figure 4 This is a three-dimensional structural diagram of the planetary gear drive device in this invention. Figure 2 ; Figure 5 This is a three-dimensional structural exploded view of the internal and external double-threaded feed device in this invention; Figure 6 This is a three-dimensional schematic diagram of the butterfly spring assembly in this invention; Figure 7 This is a three-dimensional schematic diagram of the wedge-shaped self-locking component in this invention.

[0019] Figure Labels Support base 1, planetary gear drive device 2, internal gear ring disk 21, sun gear 22, planetary carrier 23, planetary gear 24, rotating shaft 25, handwheel 26, rotating shaft 27, internal and external double thread feed device 3, internal thread sleeve 31, external thread sleeve 32, center mandrel 33, tailstock housing 34, connecting shaft 35, inclined groove 36, slider 37, insertion hole 38, clamping force holding device 4, butterfly spring assembly 41, base 411, butterfly spring assembly 412, mounting plate 413, wedge self-locking assembly 42, bracket 421, drive motor 422, wedge block 423, drive screw shaft 424, sliding plate 425, sliding rod 426, slide groove 427. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0021] The following is in conjunction with the appendix Figure 1-7 The technical solutions provided by the various embodiments of the present invention are described in detail below.

[0022] This invention provides a tailstock structure for a double-helix differential precision feed lathe, including a support base 1, a planetary gear drive device 2, an internal and external double-thread feed device 3, and a clamping force holding device 4. The support base 1 is vertically arranged, the planetary gear drive device 2 is mounted on the support base 1, and the planetary gear drive device 2 is rotatably engaged with the support base 1. The internal and external double-thread feed device 3 is mounted on the planetary gear drive device 2, and the clamping force holding device 4 is located beside the internal and external double-thread feed device 3, and the clamping force holding device 4 is slidably engaged with the internal and external double-thread feed device 3.

[0023] The planetary gear drive unit 2, serving as the core of power transmission, is mounted on the support base 1 and can rotate relative to it. It receives the operator's power by rotating the handwheel 26 and synchronously transmits the power to the internal and external double-threaded feed device 3. The internal and external double-threaded feed device 3 receives power from the planetary gear drive unit 2 and, through the nesting and relative rotation of the internal and external threaded sleeves 32, converts the rotational motion into the axial feed motion of the center mandrel 33, achieving workpiece clamping and positioning. The clamping force holding device 4 is installed beside the internal and external double-threaded feed device 3 and slides in cooperation with it. After the center mandrel 33 achieves axial clamping, it provides a stable preload and achieves self-locking anti-reverse, ensuring continuous and stable clamping force and preventing axial displacement caused by external forces. All components work together to complete the positioning and clamping of precision shaft parts and slender shafts, providing a guarantee for high-precision machining.

[0024] Specifically, the planetary gear drive device 2 includes an internal gear ring disk 21, a sun gear 22, a planet carrier 23, and planet gears 24. The internal gear ring disk 21 is rotatably connected to the support base 1. There are three planet gears 24, which mesh with the internal gear ring disk 21. The planet carrier 23 is connected to the three planet gears 24. The planet carrier 23 is provided with a rotating shaft 25, which is rotatably connected to the support base 1. A handwheel 26 is provided on the rotating shaft 25. The sun gear 22 is provided with a rotating shaft 27, which is rotatably connected to the internal gear ring disk 21 through the rotating shaft 27. The sun gear 22 meshes with the three planet gears 24.

[0025] During operation, the operator rotates the handwheel 26, which drives the rotating shaft 25 on the planetary carrier 23 to rotate synchronously, thereby driving the planetary carrier 23 to rotate. The planetary carrier 23 drives the three planetary gears 24 to revolve around the sun gear 22. At the same time, the three planetary gears 24 rotate on their own axis under the meshing action with the sun gear 22 and the internal gear ring disk 21. Since the sun gear 22 is connected to the internal threaded sleeve 31 and the internal gear ring disk 21 is connected to the external threaded sleeve 32, the revolution and rotation of the planetary gears 24 will drive the sun gear 22 and the internal gear ring disk 21 to rotate in opposite directions, thereby synchronously driving the inner and outer double threaded sleeves to rotate in opposite directions, providing synchronous and stable power for the double helix differential feed, and realizing the coordinated control of roughing feed and finishing feed.

[0026] The 24-series planetary gear transmission offers high power transmission efficiency, low loss, and smooth, vibration-free operation. This solves the problems of unstable power transmission and vibration associated with traditional single-screw tailstocks, which negatively impact machining accuracy. A single handwheel (26) can synchronously drive the inner and outer double-threaded sleeves to rotate in opposite directions, eliminating the need for an additional drive mechanism. This simplifies the operation process, reduces operator difficulty, and ensures synchronized rotation of the inner and outer sleeves, preventing feed deviations caused by asynchronous power transmission. The transmission ratio of the 24-series planetary gears can be flexibly designed according to machining requirements, easily adapting to double-threaded structures with different pitch differences, further improving the adjustability of feed accuracy. The three planetary gears (24) are evenly distributed, ensuring balanced force distribution and effectively dispersing the load during transmission, reducing wear on individual gears, extending the service life of the drive unit, and improving transmission reliability.

[0027] Specifically, the handwheel 26 has a circular structure and an anti-slip texture on its surface. The edge of the handwheel 26 is provided with a precision scale with a scale resolution of 0.001mm, which matches the feed resolution. The handwheel 26 adopts a circular structure, which conforms to the operator's grip habits and facilitates the application of rotational force. The anti-slip texture on its surface increases the friction between the hand and the handwheel 26, preventing slippage when the operator rotates the handwheel 26 and ensuring that the operating force can be stably transmitted to the planetary gear drive device 2. The precision scale dial on the edge of the handwheel 26 has a scale resolution of 0.001mm, which matches the feed resolution of 0.01mm of the tailstock. When rotating the handwheel 26, the operator can observe the scale changes on the dial to accurately control the rotation angle of the handwheel 26, and thus accurately control the axial feed of the top spindle 33, achieving precise control of minute feed amounts.

[0028] The anti-slip texture design enhances operational safety and stability, preventing operational errors caused by slippage and thus avoiding quality issues such as workpiece positioning deviation and abnormal clamping force. The precision dial and feed resolution are accurately matched, providing operators with an intuitive and precise feed reference. This solves the problem of traditional tailstocks lacking precise scale references and having difficulty controlling the feed amount, making it easier for operators to achieve precise control of minute feed amounts and further improving positioning accuracy. The circular structure design conforms to ergonomics, reducing operator fatigue during long-term operation and improving operational convenience.

[0029] Specifically, the internal and external double-threaded feed device 3 includes an internal threaded sleeve 31, an external threaded sleeve 32, a center spindle 33, and a tailstock housing 34. The internal threaded sleeve 31 is threadedly connected to the external threaded sleeve 32 and is connected to the rotating shaft 27. The external threaded sleeve 32 is connected to the outer wall of the internal gear ring 21. The center spindle 33 is provided with a connecting shaft 35. The internal threaded sleeve 31 is provided with an insertion hole 38 and a first threaded section. The connecting shaft 35 is provided with a second threaded section, and the first threaded section and the second threaded section are threadedly connected. One end of the tailstock housing 34 is threadedly connected to the external threaded sleeve 32, and the other end of the tailstock housing 34 is connected to a lathe.

[0030] During operation, the planetary gear drive device 2 drives the sun gear 22 and the internal gear ring disk 21 to rotate in opposite directions, which in turn drives the internal threaded sleeve 31 and the external threaded sleeve 32 to rotate in opposite directions. The external threaded sleeve 32 and the tailstock housing 34 undergo relative threaded motion, realizing the rough feed of the center mandrel 33 and quickly approaching the workpiece. The internal threaded sleeve 31 and the external threaded sleeve 32 undergo relative threaded motion, which simultaneously drives the center mandrel 33 to achieve fine feed and accurately adjust the clamping position. The pitch difference between the internal and external threaded sleeves 32 is set to 0.1 to 0.2 mm to form differential transmission. The final differential feed amount is only the pitch difference, which greatly improves the feed accuracy. The tailstock housing 34 is fixed in position through threaded connection to ensure the stability of the feed process and avoid radial wobble.

[0031] The nested internal and external double threads and differential transmission design specifically address the shortcomings of traditional single-screw feed mechanisms, such as large pitch and low feed resolution. Feed accuracy is improved by more than 10 times compared to traditional structures, achieving a tailstock feed resolution of 0.01 mm. This meets the precise control requirements of precision shaft parts for minute feed amounts, effectively avoiding quality issues such as workpiece machining dimensional deviations and out-of-tolerance geometric tolerances. The coarse and fine feeds work together, with the coarse feed enabling rapid positioning and the fine feed enabling precise control, balancing machining efficiency and accuracy. This solves the problem of traditional single-screw tailstocks struggling to achieve both. The threaded connection structure is stable and reliable, easy to assemble, and the threaded drive experiences uniform wear, allowing for extended service life through regular maintenance. The fixed connection between the tailstock housing 34 and the lathe effectively suppresses radial wobble during the feed process, further improving the axial positioning accuracy of the center spindle 33 and ensuring the surface quality of the machined workpiece.

[0032] Specifically, the clamping force holding device 4 includes a butterfly spring assembly 41 and a wedge self-locking assembly 42. The butterfly spring assembly 41 is connected to the connecting shaft 35, and the wedge self-locking assembly 42 is slidably connected to the connecting shaft 35.

[0033] Specifically, the butterfly spring assembly 41 includes a base 411, a butterfly spring group 412, and a mounting plate 413. The mounting plate 413 is connected to the side wall of the connecting shaft 35. The base 411 is horizontally mounted on the lathe. The two ends of the butterfly spring group 412 are respectively connected to the base 411 and the mounting plate 413.

[0034] During operation, the center spindle 33 feeds axially to clamp the workpiece, driving the connecting shaft 35 to move. The mounting plate 413 moves synchronously with the connecting shaft 35, thereby compressing the disc spring assembly 412. The disc spring assembly 412 undergoes elastic deformation, generating a uniform elastic restoring force. This restoring force is transmitted to the center spindle 33 through the mounting plate 413 and the connecting shaft 35, forming a stable clamping preload. After the center spindle 33 is in a stable position, the disc spring assembly 412 remains compressed, continuously providing preload to compensate for clamping force fluctuations caused by factors such as thread clearance and minor vibrations, ensuring that the clamping force remains stable within the set range.

[0035] The traditional cylindrical spring is replaced by a butterfly spring assembly 412. The butterfly spring has the characteristics of high elastic stiffness, strong fatigue resistance, and uniform deformation. It solves the problems of fatigue deformation and tension force attenuation of traditional cylindrical springs after long-term use, thus extending the service life of the spring assembly and ensuring long-term stable tension force. The multi-layer butterfly spring stacking design allows for flexible adjustment of the preload according to processing requirements, adapting to the tensioning needs of workpieces of different specifications and materials, and has strong versatility. The fixed connection between the base 411 and the mounting plate 413 ensures uniform force distribution on the butterfly spring assembly 412, avoids tension force deviation caused by spring skewing, further improves the stability of the tension force, and ensures the straightness and surface quality of the workpiece during processing.

[0036] Specifically, the wedge-shaped self-locking assembly 42 includes a bracket 421, a drive motor 422, a wedge block 423, a drive screw shaft 424, a sliding plate 425, and two sliding rods 426. The bracket 421 is vertically mounted on the lathe, the drive motor 422 is located on the bracket 421, the top of the drive screw shaft 424 is connected to the main shaft of the drive motor 422, the two sliding rods 426 are symmetrically connected to the bracket 421, the sliding plate 425 is slidably engaged with the two sliding rods 426, the sliding plate 425 is threadedly connected to the drive screw shaft 424, the wedge block 423 is connected to the bottom of the sliding rods 426, the wedge block 423 is provided with two sliding grooves 427, the connecting shaft 35 is provided with a slanted groove 36, and the connecting shaft 35 is provided with a slider 37 that slidably engages with the two sliding grooves 427.

[0037] During operation, when the center mandrel 33 clamps the workpiece and the clamping force reaches the set value, the drive motor 422 starts, driving the drive screw shaft 424 to rotate. The drive screw shaft 424 drives the sliding plate 425 to slide downward along the two sliding rods 426, thereby driving the wedge block 423 to move downward synchronously. The wedge block 423 cooperates with the slider 37 on the connecting shaft 35 through the sliding groove 427. During the downward movement, the inclined surface of the wedge structure generates a lateral locking force, tightly fitting the inclined groove 36 of the connecting shaft 35. The friction between the wedge block 423 and the connecting shaft 35 achieves self-locking, locking the axial position of the connecting shaft 35 and preventing the connecting shaft 35 from retracting due to external forces such as cutting force and vibration. When it is necessary to release the workpiece, the drive motor 422 rotates in the opposite direction, driving the wedge block 423 to move upward, releasing the self-locking state, and the connecting shaft 35 can move freely axially.

[0038] The wedge-shaped self-locking structure design ensures high self-locking reliability and effectively resists the influence of external forces such as cutting vibration and workpiece reaction force. It completely solves the problems of traditional tailstocks lacking a reliable self-locking mechanism and being prone to retraction, ensuring the axial position stability of the center spindle 33 and avoiding fluctuations in the clamping force. The drive motor 422 and drive screw shaft 424 work together to achieve automated and precise movement of the wedge block 423. The self-locking and unlocking operations are convenient and do not require manual operation, reducing the labor intensity of operators and improving the accuracy of self-locking control. The two sliding rods 426 are symmetrically arranged to provide stable guidance for the sliding plate 425 and the wedge block 423, preventing the wedge block 423 from tilting during movement and ensuring that the self-locking force is evenly applied to the connecting shaft 35, preventing damage to the connecting shaft 35. The sliding fit between the slide groove 427 and the slider 37 ensures smooth connection between the wedge block 423 and the connecting shaft 35, without affecting the normal axial feed movement of the connecting shaft 35, achieving synergistic compatibility between the self-locking function and the feed function.

[0039] Specifically, a pressure sensor is provided on the butterfly spring assembly 412.

[0040] The pressure sensor is installed on the disc spring assembly 412 and fits tightly against it to detect the compression pressure of the disc spring assembly 412 in real time. Since the compression pressure of the disc spring assembly 412 is linearly related to the clamping force of the center spindle 33, the pressure sensor converts the detected pressure signal into an electrical signal and transmits it to the lathe's control system or display terminal. The operator can view the specific value of the clamping force in real time through the control system and keep track of the changes in the clamping force. When the clamping force fluctuates beyond the set range by more than ±5%, the pressure sensor can trigger an alarm signal to remind the operator to adjust it in time to ensure that the clamping force is always stable within a reasonable range.

[0041] The pressure sensor enables real-time detection and visual monitoring of the clamping force, solving the problem of traditional tailstock clamping force being unquantifiable and difficult to control. This allows operators to accurately grasp the clamping status, promptly detect abnormal clamping force, and avoid potential quality and safety hazards. It can also provide real-time feedback on pressure changes in the disc spring assembly 412, enabling operators to promptly detect problems such as disc spring fatigue and wear, and perform maintenance and replacement in advance, extending the equipment's service life. In conjunction with the control system, it can achieve automatic adjustment of the clamping force, further improving the stability and accuracy of the clamping force, adapting to the stringent requirements of high-end precision machining, and ensuring the consistency of workpiece processing quality.

[0042] The above are merely embodiments of the present invention and are not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of the present invention should be included within the scope of the claims of the present invention.

Claims

1. A tailstock structure for a double-helix differential precision feed lathe, characterized in that, The device includes a support base (1), a planetary gear drive device (2), an internal and external double thread feed device (3), and a clamping force holding device (4). The support base (1) is vertically arranged. The planetary gear drive device (2) is mounted on the support base (1) and rotates with the support base (1). The internal and external double thread feed device (3) is mounted on the planetary gear drive device (2). The clamping force holding device (4) is located beside the internal and external double thread feed device (3) and slides with the internal and external double thread feed device (3).

2. The tailstock structure of the double-helix differential precision feed lathe according to claim 1, characterized in that, The planetary gear drive device (2) includes an internal gear ring disk (21), a sun gear (22), a planet carrier (23), and planetary gears (24). The internal gear ring disk (21) is rotatably connected to the support base (1). There are three planetary gears (24), which mesh with the internal gear ring disk (21). The planet carrier (23) is connected to the three planetary gears (24). The planet carrier (23) is provided with a rotating shaft (25), which is rotatably connected to the support base (1). A handwheel (26) is provided on the rotating shaft (25). The sun gear (22) is provided with a rotating shaft (27), which is rotatably connected to the internal gear ring disk (21) through the rotating shaft (27). The sun gear (22) meshes with the three planetary gears (24).

3. The tailstock structure of the double-helix differential precision feed lathe according to claim 2, characterized in that, The handwheel (26) has a circular structure and anti-slip texture on its surface. The edge of the handwheel (26) is provided with a precision dial with a scale resolution of 0.001mm, which matches the feed resolution.

4. The tailstock structure of the double-helix differential precision feed lathe according to claim 2, characterized in that, The internal and external double thread feed device (3) includes an internal thread sleeve (31), an external thread sleeve (32), a center spindle (33), and a tailstock housing (34). The internal thread sleeve (31) is threaded inside the external thread sleeve (32). The internal thread sleeve (31) is connected to the rotating shaft (27). The external thread sleeve (32) is connected to the outer wall of the internal gear ring (21). The center spindle (33) is provided with a connecting shaft (35). The internal thread sleeve (31) is provided with a insertion hole (38). The insertion hole (38) is provided with a first threaded section. The connecting shaft (35) is provided with a second threaded section. The first threaded section and the second threaded section are threadedly connected. One end of the tailstock housing (34) is threaded to the external thread sleeve (32), and the other end of the tailstock housing (34) is connected to a lathe.

5. The tailstock structure of the double-helix differential precision feed lathe according to claim 4, characterized in that, The clamping force holding device (4) includes a butterfly spring assembly (41) and a wedge self-locking assembly (42). The butterfly spring assembly (41) is connected to the connecting shaft (35), and the wedge self-locking assembly (42) is slidably connected to the connecting shaft (35).

6. The tailstock structure of the double-helix differential precision feed lathe according to claim 5, characterized in that, The butterfly spring assembly (41) includes a base (411), a butterfly spring assembly (412), and a mounting plate (413). The mounting plate (413) is connected to the side wall of the connecting shaft (35). The base (411) is horizontally mounted on the lathe. The two ends of the butterfly spring assembly (412) are respectively connected to the base (411) and the mounting plate (413).

7. The tailstock structure of the double-helix differential precision feed lathe according to claim 5, characterized in that, The wedge-shaped self-locking assembly (42) includes a bracket (421), a drive motor (422), a wedge block (423), a drive screw shaft (424), a sliding plate (425), and two sliding rods (426). The bracket (421) is vertically mounted on the lathe, the drive motor (422) is located on the bracket (421), the top of the drive screw shaft (424) is connected to the main shaft of the drive motor (422), and the two sliding rods (426) are symmetrically connected to the bracket. On the frame (421), the sliding plate (425) is slidably engaged with two sliding rods (426), the sliding plate (425) is threadedly connected to the drive screw shaft (424), the wedge block (423) is connected to the bottom of the sliding rod (426), the wedge block (423) is provided with two sliding grooves (427), the connecting shaft (35) is provided with a slanted groove (36), and the connecting shaft (35) is provided with a slider (37) that is slidably engaged with the two sliding grooves (427).

8. The tailstock structure of the double-helix differential precision feed lathe according to claim 6, characterized in that, A pressure sensor is provided on the disc spring assembly (412).

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