Chuck protection device

Abstract

The invention belongs to the technical field of machining devices, and particularly relates to a chuck protection device which comprises a driving clamping assembly, a positioning clamping assembly, a workbench assembly and a chuck protection assembly. Compared with the problems that in the prior art, the efficiency is low and the effect is unstable due to the fact that machining chippings are manually cleaned, the protective cover driven by the movable assembly is arranged on the peripheral side of the positioning chuck, the movable assembly is automatically driven in the process of driving the clamping assembly to move, and the protective cover is opened to expose the chuck during feeding and discharging; and during machining, the clamping plate is closed and tightly abuts against the workbench assembly. By means of the structure, real-time and automatic physical isolation of the positioning chuck is formed, invasion of chippings is fundamentally prevented, the long-term positioning and clamping precision of the mechanical chuck is effectively guaranteed, and the machining quality and the automation level are improved.

Description

Technical Field

[0001] This invention belongs to the field of machining equipment technology, and specifically relates to a chuck protection device. Background Technology

[0002] In the field of modern machining, mechanical chucks, as core workpiece positioning and clamping devices, are widely used in various automated machining equipment such as lathes, milling machines, and machining centers. They achieve the opening and closing of the jaws through hydraulic, pneumatic, or mechanical transmission, directly and rigidly clamping workpieces such as shafts, discs, and boxes, or indirectly fixing irregularly shaped workpieces through tooling fixtures. This provides a stable support foundation for subsequent machining processes such as turning, milling, drilling, and grinding. The clamping accuracy and positioning stability directly determine the dimensional accuracy, geometric tolerances, and surface quality of the workpiece, making them a key factor in ensuring machining efficiency and product qualification rates.

[0003] As the manufacturing industry upgrades towards higher precision and automation, the market's requirements for the precision of machined parts are becoming increasingly stringent. The dimensional tolerances of some precision components have reached the micrometer level, which places higher demands on the precision maintenance capabilities of mechanical chucks. However, in actual machining processes, the generation and accumulation of machining debris has become one of the main problems affecting the stability of chuck precision. During machining operations, a large amount of machining debris is generated, with particle sizes ranging from a few micrometers to several millimeters. This debris can fall into the chuck, interfering with its precision. Currently, the industry's solutions to this problem are mostly manual periodic cleaning or high-pressure air gun blowing. These methods not only consume production time and reduce processing efficiency, but the cleaning effect also depends on the operator's conscientiousness and operating procedures, making it difficult to achieve real-time and thorough removal of debris. Especially in batch continuous production scenarios, the intermittent nature of manual cleaning can easily lead to continuous debris accumulation, thereby causing machining quality problems.

[0004] Therefore, in order to address the adverse effects of machining debris on the accuracy of mechanical chucks during machining, there is an urgent need to develop an improved mechanical chuck structure that can effectively block, collect, or discharge machining debris. Summary of the Invention

[0005] The present invention aims to provide a chuck protection device, which is mainly used to solve the problem that debris can interfere with the chuck clamping accuracy during the processing of existing technologies.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: A chuck protection device includes a drive clamping assembly, a positioning clamping assembly, and a worktable assembly. The drive clamping assembly clamps the worktable assembly and moves it to the positioning clamping assembly for fixation. The positioning clamping assembly includes a positioning chuck and a chuck protection assembly. The chuck protection assembly includes a protective cover and a movable assembly. The protective cover is mounted on the movable assembly and movably sleeved around the positioning chuck. The drive clamping assembly drives the movable assembly and moves the protective cover to abut against or away from the worktable assembly, so that the protective cover prevents machining debris from entering the positioning chuck.

[0007] Preferably, the positioning clamping assembly further includes a mounting base, on which the positioning chuck is mounted; The drive clamping assembly includes a transfer arm and a fixed clamping assembly, which is mounted on the transfer arm to clamp the worktable assembly; The movable components include a telescopic reset mechanism fixedly mounted on the mounting base and a connecting mechanism that connects the telescopic reset mechanism and the protective cover respectively. The telescopic reset mechanism is mounted on the mounting base.

[0008] Preferably, the telescopic reset mechanism includes a connecting rod base, a connecting rod fixing plate, short connecting rods, connecting rods, long connecting rods, and a reset assembly. There are two connecting rod bases, which are installed parallel to each other on the mounting base. The connecting rod fixing plate is fixed between the two connecting rod bases. There are four short connecting rods, which are correspondingly and movably installed at both ends of the two connecting rod bases. There are two long connecting rods, which are correspondingly and movably installed at the ends of the two short connecting rods on the same side. The connecting rod is installed at the end of the two long connecting rods away from the positioning chuck to connect the two long connecting rods. The reset assembly is installed on the movable assembly. The connecting mechanism includes a slide block and a limiting bolt. The long connecting rod has a sliding hole at one end near the positioning chuck. There are two slide blocks, which are fixedly installed on both sides of the protective cover. The limiting bolt is fixed to the slide block and is slidably installed in the sliding hole.

[0009] Preferably, the reset assembly includes a mounting rod, a first limiting rod, a second limiting rod, and torsion springs. The mounting rod is fixed to the lower ends of two short connecting rods on the side away from the positioning chuck. The first limiting rod is fixed to the middle of the two short connecting rods away from the positioning chuck. The second limiting rod is fixed to one end of the base of the two connecting rods away from the positioning chuck. There are two torsion springs and they are sleeved on both sides of the mounting rod. The torsion feet of the torsion springs are located between the first limiting rod and the second limiting rod.

[0010] Preferably, the connecting rod also includes a lubricating sleeve, which is fitted onto the middle of the connecting rod to protect the contact portion between the connecting rod and the transmission arm.

[0011] Preferably, the worktable assembly further includes a machining table, a positioning rod, and a positioning clamping plate. The positioning rod is fixed to the lower center of the machining table to cooperate with the positioning chuck for positioning. The positioning clamping plate is fixed to the lower part of the machining table, and the positioning chuck cooperates with the positioning clamping plate to fix the machining table.

[0012] Preferably, the fixing fixture assembly includes a drive assembly, grippers, slide rails, and sliders. The drive assembly is installed on the upper part of the transmission arm, the slide rails are horizontally fixedly installed on one end of the transmission arm near the positioning and clamping assembly, there are two grippers, and a slider is fixedly installed on the lower part of each gripper. The two grippers are installed opposite each other on both sides of the drive assembly, and the sliders are correspondingly slidably installed on the slide rails; wherein the drive assembly is a clamping cylinder.

[0013] Preferably, the fixing fixture assembly further includes a mounting plate and a fixture drive switch. One end of the mounting plate is fixed to the lower part of a gripper, and the other end is equipped with a fixture drive switch for controlling the drive assembly.

[0014] Preferably, the fixing fixture assembly further includes two limiting members, which are installed on both sides of the two gripper ends to clamp the fixing worktable assembly.

[0015] Preferably, the longitudinal thickness of the transmission arm near the positioning clamping component is smaller than that of the other end, and gradually thickens in the middle, so as to progressively drive the moving component.

[0016] Preferably, a limit ring is also provided on the mounting rod, which is integrally formed on the mounting rod to limit the torsion spring.

[0017] The beneficial effects of this invention are as follows: 1. To address the issue of debris intrusion into the positioning chuck, affecting its accuracy, this device incorporates a chuck protection component that opens and closes with the movement of the transfer arm. In non-working states or during processing, the protective cover tightly covers the positioning chuck, abutting against the worktable fixed to it, forming a physical barrier and fundamentally preventing debris intrusion. The protective cover only briefly opens when loading or unloading is required, exposing the chuck for workpiece positioning and clamping.

[0018] 2. To achieve linkage between the chuck's movable component and the transfer arm, the chuck protective assembly includes a protective cover and a movable component. The transfer arm is specially designed with a thinner longitudinal section near the front end of the positioning clamping component, gradually thickening towards the rear to form a gradually changing driving slope, used to smoothly push the movable component during movement. The movable component includes two parallel connecting rod bases fixed to the mounting base on both sides of the positioning chuck. The two connecting rod bases are fixed together by a connecting rod fixing plate. Each end of each connecting rod base is hinged to a short connecting rod by a pin, allowing the short connecting rod to rotate around the pin. The free ends of the two short connecting rods on the same side are also hinged together to a long connecting rod by a pin. The two long connecting rods are fixed together at the ends away from the positioning chuck by a transverse connecting rod, thus ensuring that the movement of the connecting rods on the left and right sides is completely synchronized; thus forming a movable four-bar linkage structure. The long connecting rod has an upwardly extending section at the end near the positioning chuck, with an elongated sliding hole on this extension. On the slides on both sides of the aforementioned protective cover, limit bolts are fixedly installed. These limit bolts pass through and slide within the sliding holes of the long connecting rod. This cooperation between the sliding holes and the limit bolts allows the protective cover to have a certain vertical floating space while moving with the long connecting rod, ensuring that it can ultimately be smoothly pressed against the worktable assembly.

[0019] 3. To ensure the protective cover automatically returns to its protective state after the external force on the transmission arm is removed, a reset assembly is also installed on the movable component. This reset assembly includes a mounting rod, which is fixedly mounted on the lower ends of two short connecting rods located away from the positioning chuck. A first limiting rod is fixedly connected to the middle of the two short connecting rods; a second limiting rod is fixedly connected to the ends of the corresponding two long connecting rods. Two torsion springs are fitted on the mounting rod, and a limiting ring is integrally formed on the mounting rod for axial positioning of the torsion springs. The two torsion feet of the torsion springs abut against the first and second limiting rods, respectively. When the movable component is driven to deform, the distance and relative angle between the first and second limiting rods change, thereby compressing the torsion springs to accumulate elastic potential energy; once the driving force disappears, the torsion springs release energy, pushing the entire movable component back to its initial position and causing the protective cover to rise. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention patent; Figure 2 This is a side view of the present invention patent; Figure 3 This is a schematic diagram of the overall structure of the drive clamping assembly of this invention patent; Figure 4 This is a schematic diagram of the overall structure of the workbench assembly of this invention patent; Figure 5 This is a schematic diagram of the overall structure of the positioning and clamping assembly in this invention patent; Figure 6 This is a schematic diagram of the overall structure of the chuck protection component in this invention patent; Figure 7 In this invention patent Figure 6 Enlarged view of point A in the middle.

[0022] The reference numerals in the accompanying drawings include: 100, drive clamping assembly; 110, transmission arm; 111, slide rail; 120, fixed clamping assembly; 121, drive assembly; 122, mounting plate; 123, gripper; 124, slider; 125, limit element; 126, clamping drive switch; 200, worktable assembly; 210, machining table; 220, positioning clamping plate; 230, positioning rod; 300, positioning clamping assembly; 310, mounting base; 320 400. Positioning chuck; 410. Chuck protection assembly; 421. Protective cover; 422. Movable assembly; 423. Linkage base; 424. Linkage fixing plate; 425. Short link; 426. Connecting rod; 427. Long link; 428. Sliding hole; 429. Slide block; 430. Limiting bolt; 431. Lubricating sleeve; 432. Reset assembly; 433. Mounting rod; 434. First limiting rod; 435. Second limiting rod; 436. Torsion spring; 437. Limiting ring. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "top surface," "bottom surface," "inner," "outer," "inner side," and "outer side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0025] In the description of this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. Where the terms "first," "second," and "third" are used for descriptive purposes and to distinguish technical features, they should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the sequential relationship of the indicated technical features.

[0026] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The embodiments of this invention will now be described according to its overall structure.

[0027] This invention provides a chuck protection device, which is mainly used to protect the positioning chuck 320 from interference by machining debris during machining, ensuring the clamping accuracy and positioning stability of the workpiece. Figures 1-6 As shown, the core of this chuck protection device lies in the use of a movable protective cover 410 to cover the positioning chuck 320 in the non-working state, preventing debris from entering; in the working state, the protective cover 410 is driven to move away, exposing the positioning chuck 320 to fix the workpiece. The device includes a drive clamping assembly 100, a positioning clamping assembly 300, a worktable assembly 200, and a chuck protection assembly 400. These components work together to achieve automated protection.

[0028] The positioning and clamping assembly 300 includes a mounting base 310, which is fixedly mounted on the machine tool base or movably mounted on the machine tool's slide shaft, providing stable support. A positioning chuck 320 is mounted on the mounting base 310. The positioning chuck 320 is used to precisely fix the worktable assembly 200 and typically contains a clamping mechanism, such as a hydraulic or pneumatic gripper 123, for clamping the workpiece. A protective cover 410 of the chuck protection assembly 400 is movably fitted around the positioning chuck 320, forming a ring structure, which covers the positioning chuck 320 during non-machining stages to isolate machining debris.

[0029] The chuck protection assembly 400 also includes a movable assembly 420, which is connected to the protective cover 410 and drives the protective cover 410 to move up and down. The movable assembly 420 includes a telescopic reset mechanism and connecting mechanisms that connect the telescopic reset mechanism to the protective cover 410. The telescopic reset mechanism includes two parallel connecting rod bases 421 mounted on the mounting base 310, which are fixed by bolts or other means. A connecting rod fixing plate 422 is fixedly connected between the connecting rod bases 421, and the fixing plate is also fixedly mounted on the mounting base 310. The connecting rod fixing plate 422 enhances the overall rigidity and prevents the connecting rod bases 421 from deforming. Two short connecting rods 423 are movably mounted at each end of each connecting rod base 421. The short connecting rods 423 are connected to the connecting rod base 421 by pins or bearings and can rotate around the connection point. A long connecting rod 425 is movably mounted at the ends of two short connecting rods 423 on the same side. The long connecting rod 425 is linked to the short connecting rods 423 via pins or bearings, forming a four-bar linkage. The ends of the two long connecting rods 425 furthest from the positioning chuck 320 are connected by a connecting rod 424, which is fixed or hinged to the long connecting rods 425, allowing the two long connecting rods 425 to move synchronously. The extended portion of the long connecting rod 425 near the positioning chuck 320 is provided with a sliding hole 426, which is an elongated slot for guidance. The connecting mechanism includes slide seats 427 fixedly mounted on both sides of the protective cover 410, which are connected to the protective cover 410 by bolts or welding. Each slide block 427 is fixed with a limiting bolt 428, which is slidably installed in the slide hole 426, so that the protective cover 410 can move relative to the long connecting rod 425 along the direction of the slide hole 426. When the four-bar linkage is active, the slider 124 can move adaptively in the slide hole 426 to ensure that the protective cover 410 does not get stuck during the movement.

[0030] The telescopic reset mechanism is also equipped with a reset assembly 430, which is used to automatically restore the protective cover 410 to its position after the driving force is removed. The reset assembly 430 includes a mounting rod 431, which is fixed to the lower end of two short connecting rods 423 on the side away from the positioning chuck 320. The mounting rod 431 and the short connecting rods 423 are fixed by welding or thread. A limiting ring 435 is sleeved on the mounting rod 431, which is integrally formed on the mounting rod 431 and is used for axial positioning. The reset assembly 430 also includes a first limiting rod 432 and a second limiting rod 433. The first limiting rod 432 is fixed to the middle of the two short connecting rods 423 away from the positioning chuck 320 and is rigidly connected to the short connecting rods 423. The second limiting rod 433 is fixed to one end of the base 421 of the two connecting rods away from the positioning chuck 320, close to the mounting rod 431, and fixed to the base 4215 of the connecting rod. A torsion spring 434 is fitted on each side of the mounting rod 431. The torsion foot of the torsion spring 434 is located between the first limiting rod 432 and the second limiting rod 433. When the movable component 420 is driven to deform, the torsion spring 434 is compressed, stretched or twisted, storing elastic potential energy. After the driving force disappears, the torsion spring 434 returns to its original state and pushes the movable component 420 to reset.

[0031] The drive clamping assembly 100 is used to clamp the worktable assembly 200 and drive the movable assembly 420. The drive clamping assembly 100 includes a transmission arm 110, one end of which is fixed to a drive device, such as a multi-axis robot or hydraulic cylinder, which can drive the transmission arm 110 to move in multiple directions. The longitudinal thickness of the transmission arm 110 near the positioning clamping assembly 300 is smaller than that of the other end, and gradually thickens in the middle, forming a progressive profile for smoothly pushing the movable assembly 420 during movement. A fixing clamp assembly 120 is mounted on the transmission arm 110, which includes a drive assembly 121, preferably a clamping cylinder, mounted on the upper part of the transmission arm 110. A slide rail 111 is laterally fixedly mounted on the end of the transmission arm 110 near the positioning clamping assembly 300, and the slide rail 111 is connected to the transmission arm 110 by bolts. The fixed clamp assembly 120 also includes two grippers 123, each gripper 123 having a slider 124 fixedly mounted on its lower part. The slider 124 cooperates with the slide rail 111, allowing the gripper 123 to slide along the slide rail 111. The two grippers 123 are mounted opposite each other on both sides of the drive assembly 121. The drive assembly 121 drives the grippers 123 to move towards or away from each other to clamp or release the worktable assembly 200.

[0032] The fixed clamp assembly 120 also includes a mounting plate 122, one end of which is fixed to the lower part of a gripper 123, and the other end is equipped with a clamp drive switch 126. The clamp drive switch 126 is used to control the action of the drive assembly 121 and also has the function of detecting the clamp opening and closing distance. In addition, the fixed clamp assembly 120 also includes two limiting members 125, which are correspondingly installed on both sides of the clamping ends of the two grippers 123 to fix the worktable assembly 200 during clamping and prevent it from sliding.

[0033] The worktable assembly 200 includes a machining table 210, which is used to place workpieces and perform machining. A positioning rod 230 is fixedly connected to the lower center of the machining table 210. The positioning rod 230 cooperates with the positioning chuck 320 and is inserted into the positioning chuck 320 for precise positioning. A positioning clamping plate 220 is also fixedly connected to the lower part of the machining table 210. The positioning clamping plate 220 works in conjunction with the positioning chuck 320 to fix the machining table 210 by clamping force.

[0034] A lubricating sleeve 429 is also fitted in the middle of the connecting rod 424. The lubricating sleeve 429 is made of self-lubricating material and is used to reduce friction when the transmission arm 110 contacts the connecting rod 424, protect the surface of the connecting rod 424, and extend its service life.

[0035] In use, the drive clamping assembly 100 clamps the processing table 210 of the worktable assembly 200 via the fixed clamping assembly 120. The transmission arm 110 moves under the drive of the drive device, transporting the worktable assembly 200 to the positioning clamping assembly 300. During the movement, the front end of the transmission arm 110 progressively pushes the connecting rod 424 of the movable assembly 420. Due to the change in thickness of the transmission arm 110, the thrust gradually increases, avoiding impact. After the connecting rod 424 is pushed, it drives the long connecting rod 425 and the short connecting rod 423 to rotate, causing the movable assembly 420 to deform. The protective cover 410 moves along the sliding hole 426 via the limiting bolt 428 on the slide block 427, causing the protective cover 410 to slide downward, exposing the positioning chuck 320. At the same time, the torsion spring 434 of the reset assembly 430 is twisted, storing energy. The worktable assembly 200 is placed on the positioning chuck 320, the positioning rod 230 is inserted into the positioning chuck 320, and the positioning chuck 320 clamps the positioning clamping plate 220, fixing the machining table 210. The drive clamping assembly 100 then releases the worktable assembly 200 and moves away, and the transfer arm 110 moves away from the connecting rod 424. The torsion spring 434 of the reset assembly 430 releases energy, pushing the movable assembly 420 to reset, and the protective cover 410 moves upward, abutting against the lower surface of the machining table 210 of the worktable assembly 200, forming a sealing ring, effectively preventing machining debris from entering the interior of the positioning chuck 320. During machining, the protective cover 410 remains in abutting state to prevent debris accumulation; when it is necessary to change the workpiece, the above process is repeated, and the protective cover 410 is driven to move away again.

[0036] The foregoing description of specific exemplary embodiments of the present invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the invention to the precise forms disclosed, and it is obvious that many changes and variations can be made based on the above teachings. Although embodiments of the invention have been shown and described, these specific embodiments are merely explanations of the invention and are not intended to limit it. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. The purpose of selecting and describing exemplary embodiments is to explain the specific principles of the invention and its practical application, so that those skilled in the art, after reading this specification, can make modifications, substitutions, variations, and various choices and changes to the embodiments as needed without departing from the principles and spirit of the invention, provided that such modifications, substitutions, variations, and choices and changes are within the scope of the claims of the invention and are protected by patent law.

Claims

1. A chuck protection device, comprising a drive clamping assembly (100), a positioning clamping assembly (300), and a worktable assembly (200), wherein the drive clamping assembly (100) clamps the worktable assembly (200) and moves it to the positioning clamping assembly (300) for fixation by the positioning clamping assembly (300), and the positioning clamping assembly (300) includes a positioning chuck (320), characterized in that, It also includes a chuck protection assembly (400), which includes a protective cover (410) and a movable component (420). The protective cover (410) is mounted on the movable component (420) and movably sleeved around the positioning chuck (320). The drive clamping assembly (100) is used to drive the movable component (420) and drive the protective cover (410) to abut against or move away from the worktable assembly (200), so that the protective cover (410) prevents machining debris from entering the positioning chuck (320).

2. The chuck protection device according to claim 1, characterized in that, The positioning clamping assembly (300) also includes a mounting base (310), on which the positioning chuck (320) is mounted; The drive clamping assembly (100) includes a transmission arm (110) and a fixing clamp assembly (120), the fixing clamp assembly (120) being mounted on the transmission arm (110) for clamping the worktable assembly (200). The active component (420) includes a telescopic reset mechanism fixedly mounted on the mounting base (310) and a connecting mechanism that connects the telescopic reset mechanism and the protective cover (410) respectively. The telescopic reset mechanism is mounted on the mounting base (310).

3. A chuck protection device according to claim 2, characterized in that, The telescopic reset mechanism includes a connecting rod base (421), a connecting rod fixing plate (422), short connecting rods (423), a connecting rod (424), a long connecting rod (425), and a reset assembly (430). There are two connecting rod bases (421) installed parallel to each other on the mounting base (310). The connecting rod fixing plate (422) is fixed between the two connecting rod bases (421). There are four short connecting rods (423) installed movably at both ends of the two connecting rod bases (421). There are two long connecting rods (425) installed movably at the ends of the two short connecting rods (423) on the same side. The connecting rod (424) is installed at the end of the two long connecting rods (425) away from the positioning chuck (320) to connect the two long connecting rods (425). The reset assembly (430) is installed on the movable assembly (420). The connecting mechanism includes a slide block (427) and a limiting bolt (428). The long connecting rod (425) has a sliding hole (426) on the extended part near the positioning chuck (320). There are two slide blocks (427) and they are fixedly installed on both sides of the protective cover (410). The limiting bolt (428) is fixed to the slide block (427) and is slidably installed in the sliding hole (426).

4. A chuck protection device according to claim 3, characterized in that, The reset assembly (430) includes a mounting rod (431), a first limiting rod (432), a second limiting rod (433), and a torsion spring (434). The mounting rod (431) is fixed to the lower end of two short connecting rods (423) on the side away from the positioning chuck (320). The first limiting rod (432) is fixed to the middle of the two short connecting rods (423) away from the positioning chuck (320). The second limiting rod (433) is fixed to one end of the base of the two connecting rods (421) away from the positioning chuck (320). There are two torsion springs (434) and they are sleeved on both sides of the mounting rod (431). The torsion foot of the torsion spring (434) is located between the first limiting rod (432) and the second limiting rod (433).

5. A chuck protection device according to claim 3, characterized in that, The connecting rod (424) also includes a lubricating sleeve (429), which is fitted onto the middle part of the connecting rod (424) to protect the contact portion between the connecting rod (424) and the transmission arm (110).

6. A chuck protection device according to claim 1, characterized in that, The worktable assembly (200) also includes a machining table (210), a positioning rod (230), and a positioning clamping plate (220). The positioning rod (230) is fixed to the lower middle part of the machining table (210) to cooperate with the positioning chuck (320) for positioning. The positioning clamping plate (220) is fixed to the lower part of the machining table (210). The positioning chuck (320) cooperates with the positioning clamping plate (220) to fix the machining table (210).

7. A chuck protection device according to claim 2, characterized in that, The fixing fixture assembly (120) includes a drive assembly (121), grippers (123), a slide rail (111), and a slider (124). The drive assembly (121) is mounted on the upper part of the transmission arm (110). The slide rail (111) is horizontally fixedly mounted on one end of the transmission arm (110) near the positioning clamping assembly (300). There are two grippers (123). The slider (124) is fixedly mounted on the lower part of each gripper (123). The two grippers (123) are mounted opposite each other on both sides of the drive assembly (121). The slider (124) is slidably mounted on the slide rail (111).

8. A chuck protection device according to claim 7, characterized in that, The fixed clamp assembly (120) also includes a mounting plate (122) and a clamp drive switch (126). One end of the mounting plate (122) is fixed to the lower part of a clamp (123), and the other end is equipped with the clamp drive switch (126) and used to control the drive assembly (121).

9. A chuck protection device according to claim 2, characterized in that, The longitudinal thickness of the transmission arm (110) is smaller at one end near the positioning clamping assembly (300) than at the other end, and gradually thickens in the middle, so as to progressively drive the active assembly (420).

10. A chuck protection device according to claim 4, characterized in that, The mounting rod (431) is also provided with a limiting ring (435), which is integrally formed on the mounting rod (431) to limit the torsion spring (434).

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