Intelligent numerical control cutter

Abstract

The application discloses an intelligent numerical control cutter, and has the technical scheme that a protection structure is arranged on a digital display module, the protection structure is contacted with the outer peripheral wall of a cutter bar before a magnetic attraction structure in installation through a telescopic sheath, buffering is formed for the attraction process of the magnetic attraction structure, and hard impact is avoided; and an internal locking mechanism is used to seal the elastic counterforce of the sheath in the module shell, so that the counterforce is isolated from the cutter bar, and the magnetic attraction force is not weakened. While the magnetic attraction structure is protected from impact damage, no additional operation step is added, and the structure of the cutter bar body is not changed, so that the installation safety and service life of the digital display module are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of online measurement and tool adjustment technology in the field of precision metal cutting, and particularly to an intelligent CNC tool. Background Technology

[0002] In the precision machining of critical components such as large diesel engine cylinder bores and aerospace precision valve bodies, the bore diameter must be controlled within the micrometer tolerance range. Traditional offline tool adjustment methods require removing the tool from the machine tool, adjusting it with a tool setter, and then re-clamping it. This is not only inefficient, but also makes it difficult to eliminate repeated clamping errors. In recent years, intelligent CNC tooling has emerged, which features a digital display module that can be detachably magnetically attached to the side of the boring tool body. Operators can directly read the tool tip displacement on the machine tool, achieving micrometer-level precision adjustment without removing the tool.

[0003] However, existing detachable digital display modules still have the following significant drawbacks: 1. The most critical structural problem is that the end face of the permanent magnet block fixedly mounted on the digital display module housing usually protrudes from the module's mounting base surface. During installation, the permanent magnet block is directly attracted to the outer peripheral wall of the tool holder by strong magnetic force. Since both the permanent magnet block and the tool holder are rigid bodies, and the magnetic force generates a strong instantaneous attraction within a critical distance, the end face of the permanent magnet block and the surface of the tool holder experience a violent hard collision, which can easily lead to local breakage and cracking of the permanent magnet block. The fragments of the broken permanent magnet block have strong magnetism and are easily attracted to the surface of the tool holder or the cutting area. In subsequent cutting operations, they may enter the contact interface between the tool tip and the workpiece, causing tool chipping, workpiece surface scratches, and seriously damaging machining quality and tool life. In addition, the strong hard impact during installation can also be transmitted to the internal electronic components through the module housing, affecting the long-term reliability of the digital display module. 2. In terms of practicality, existing products do not have any protective structure to prevent magnetic impact. Operators need to be extremely careful to control the speed and angle of approach during installation to avoid collisions. This requires a high level of operational experience, has low installation efficiency, and long-term repeated impacts will accelerate the demagnetization of permanent magnets and shorten the product's lifespan.

[0004] The aforementioned defects all stem from the existing structural design of rigidly protruding permanent magnets in digital display modules, which lack necessary buffering and protection mechanisms when magnetically engaging with the tool holder. Therefore, this invention aims to provide an improved mounting structure for the digital display module of an intelligent CNC tool, effectively solving the problem of hard impact damage during the permanent magnet engagement process without altering the tool body or weakening the magnetic fixing force. Summary of the Invention

[0005] To address the core problem in existing technologies where the permanent magnet of the digital display module directly impacts the outer wall of the tool holder during magnetic installation, causing the permanent magnet to shatter and even contaminate the cutting area, this invention provides an improved intelligent CNC tool. Its core technical concept lies in setting up a protective structure on the digital display module, independent of the magnetic attraction structure. This allows the impact energy during installation to be absorbed by the protective structure, rather than being borne by the permanent magnet, thereby eliminating the possibility of direct impact from the permanent magnet at its source.

[0006] To achieve the aforementioned core inventive concept, this invention features a countersunk hole on the left wall of the digital display module. A magnetic structure is fixed inside the countersunk hole, with its left end face not protruding from the left wall of the digital display module. This ensures the magnetic structure is naturally contained and not directly exposed to the module surface. An annular sleeve is slidably connected within the countersunk hole. In its natural state, this sleeve is pushed out of the left wall of the digital display module by a first spring. Therefore, during installation, the sleeve contacts the tool holder before the magnetic structure. The first spring absorbs impact energy during the compression of the sleeve, buffering the magnetic structure's attraction process. In subsequent contact, the magnetic structure only needs to overcome the film thickness to form a close fit with the tool holder, without any hard impact. An annular groove is formed on the outer peripheral wall of the sheath. A sliding cavity and a limiting ring are set inside the digital display module. The cross-sectional dimensions of the limiting ring are adapted to the bottom diameter of the annular groove. When the sheath is pressed into the locking position where its left end face is flush with the left wall of the digital display module, the limiting ring is axially aligned with the annular groove. At this time, the limiting ring automatically engages with the annular groove under the action of the second spring, locking the sheath axially in a retracted state. The pressing rod is fixedly connected to the limiting ring and extends out of the upper wall of the digital display module. After operation, pressing the pressing rod will disengage the limiting ring from the annular groove, and the sheath will automatically reset and extend under the action of the first spring, returning to its initial protective state. In the specific construction of the magnetic attraction structure, the surface of the permanent magnet is preferably covered with a flexible protective layer. This protective layer is used to isolate the permanent magnet from direct rigid contact with the tool holder surface, further absorbing residual micro-impacts, and also has a sealing and dustproof function, contributing to the achievement of the IP68 protection rating. As an alternative, the cross-sectional shape of the limiting ring can be circular, rectangular, or other geometric shapes that match the bottom diameter of the ring groove. As long as its cross-sectional dimensions match the bottom diameter of the ring groove, the locking function of engaging or disengaging can be achieved. The fixed connection between the first spring and the right end of the sheath and the inner right wall of the countersunk hole can be achieved by adhesive bonding or by a snap-fit ​​structure. The snap-fit ​​method offers greater convenience for disassembly and maintenance.

[0007] To address the practicality issues of existing technologies that require operators to carefully control installation speed and angle to avoid impact and demand high levels of operational experience, this invention further optimizes the installation process. During installation, the protective structure of this invention only requires the operator to press the digital display module towards the tool holder to automatically complete buffering and locking. When the sheath retracts to the locked position, the limit ring automatically engages in the ring groove and provides a perceptible feedback of placement. No additional adjustments or alignment are required from the operator, significantly reducing operational difficulty and installation time.

[0008] To address the potential problem in existing technologies where the use of buffer elements such as springs generates elastic reaction force, which is opposite in direction to the magnetic attraction force and thus weakens the magnetic attraction, this invention avoids this issue through the structural design of the locking mechanism described above. When the limiting ring engages with the ring groove to axially lock the sheath, the elastic reaction force generated by the first spring under compression is transmitted through the sheath ring groove to the limiting ring, and then from the limiting ring to the interior of the digital display module housing. The transmission path of this elastic reaction force is interrupted at the sheath and the limiting ring and enclosed within the housing, preventing it from being transmitted to the outer peripheral wall of the tool holder. Therefore, the force acting between the tool holder and the digital display module is only the magnetic attraction force generated by the magnetic structure. The elastic reaction force of the first spring does not cancel or weaken the magnetic attraction force, ensuring the stability and reliability of the magnetic fixation. Simultaneously, due to the axial locking effect of the limiting ring on the sheath, the sheath will not repeatedly expand and contract due to machine tool vibration during the use of the digital display module attached to the tool holder, further improving the module's installation firmness. In the preferred embodiment, the first spring is fixed to the right end of the sheath and the inner right wall of the countersunk hole via a snap-fit ​​structure, facilitating spring replacement during later maintenance. The cross-sectional shape of the limiting ring can be circular or rectangular. A circular cross-section offers the advantage of simple processing, while a rectangular cross-section increases the contact area with the bottom diameter of the ring groove, improving locking stability. Both alternatives can achieve axial locking, and the choice can be made based on actual manufacturing processes and cost requirements. The charging module, as a supporting device, has a charging slot for the digital display module to be inserted and charged, and a charging cable for connecting to an external power source. This charging module replenishes the digital display module's power when it is not in use, ensuring sufficient power for the next use.

[0009] The present invention has the following beneficial effects: 1. The protective structure set on the digital display module of this invention effectively isolates and buffers the magnetic attraction structure during installation, preventing the permanent magnet from directly impacting the outer peripheral wall of the tool holder and causing it to break or crack. This eliminates the risk of magnetic fragments entering the cutting area and causing tool breakage and workpiece surface scratches, ensuring machining safety and tool life.

[0010] 2. In this invention, the protective structure automatically triggers locking during installation through telescopic movement. The operator can complete the buffering and locking by simply pushing the digital display module in, without any additional operation steps. This simplifies the installation process and effectively reduces the difficulty of on-site operation and the requirements for operator experience.

[0011] 3. In the present invention, the protective structure, when locked, encloses the elastic reaction force transmission path of the buffer component inside the digital display module housing, thus isolating the reaction force from the tool holder body. The magnetic attraction force is not canceled out by the elastic reaction force, ensuring the adsorption stability between the digital display module and the tool holder. At the same time, it avoids the demagnetization effect caused by long-term repeated impacts on the magnetic attraction structure, extending the product's service life. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a front sectional view of the internal structure of the digital display module; Figure 3 A front sectional view of the internal structure of the digital display module after part of it has been removed; Figure 4 This is a left sectional view of the internal structure of the digital display module. Figure 5 Left sectional view of the internal structure of the digital display module after partial removal; Figure 6 This is a partial cross-sectional view of the permanent magnet block and the flexible protective layer.

[0013] Legend: 1. Tool holder body; 2. Digital display module; 201. Countersunk hole; 202. Sliding hole; 203. Spring hole; 204. Sliding cavity; 3. Charging module; 301. Charging slot; 302. Charging cable; 4. Pressing rod; 5. Magnetic structure; 501. Permanent magnet; 502. Flexible protective layer; 6. Sheath; 601. Ring groove; 7. First spring; 8. Second spring; 9. Limiting ring. Detailed Implementation

[0014] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings to further illustrate the technical solutions of the present invention. However, the present invention is not limited to these embodiments.

[0015] like Figure 1-6 As shown, this intelligent CNC cutting tool includes a tool holder body 1, a digital display module 2, and a charging module 3. The tool holder body 1 is a cylindrical rod-shaped structure with a smooth metal surface on its outer periphery. The digital display module 2 is a rectangular block structure that is detachably attached to the outer periphery of the tool holder body 1 by magnetic attraction. The charging module 3 is set independently of the digital display module 2 and is used to replenish the power of the digital display module 2 when it is not in use.

[0016] The digital display module 2 has a magnetic attraction structure 5 inside, which generates a magnetic attraction force to adhere to the outer peripheral wall of the tool holder body 1. The magnetic attraction structure 5 includes a permanent magnet block 501 and a flexible protective layer 502 covering the surface of the permanent magnet block 501. The flexible protective layer 502 is made of polytetrafluoroethylene film with a thickness of 0.1 mm to 0.3 mm, and is used to isolate the permanent magnet block 501 from direct rigid contact with the surface of the tool holder body 1. The housing of the digital display module 2 is injection molded from engineering plastic, and the permanent magnet block 501 is fixed inside the housing by adhesive or insert injection molding.

[0017] The digital display module 2 is equipped with a protective structure, which is used to protect the magnetic structure 5 during installation and prevent the magnetic structure 5 from directly impacting the outer peripheral wall of the tool holder body 1.

[0018] The protective structure is specifically constructed as follows: a countersunk hole 201 is provided on the left wall of the digital display module 2. The countersunk hole 201 is a round hole, and its axis extends along the left and right direction of the digital display module 2. The magnetic attraction structure 5 is fixed inside the countersunk hole 201, and its left end face does not protrude from the left wall of the digital display module 2, that is, the left end of the magnetic attraction structure 5 is flush with the opening of the countersunk hole 201.

[0019] An annular sleeve 6 is slidably connected inside the countersunk hole 201. The annular sleeve 6 has a circular structure, and its outer diameter is adapted to the inner diameter of the countersunk hole 201, allowing it to slide left and right along the axial direction of the countersunk hole 201. The natural state of the annular sleeve 6 is its extended state, that is, the left end of the annular sleeve 6 protrudes from the left wall of the digital display module 2. During installation, the annular sleeve 6 contacts the outer peripheral wall of the tool holder body 1 before the magnetic attraction structure 5.

[0020] A first spring 7 is provided between the right end of the annular sleeve 6 and the inner right wall of the countersunk hole 201. The first spring 7 is a compression spring, with its left end fixedly connected to the right end of the annular sleeve 6 and its right end fixedly connected to the inner right wall of the countersunk hole 201. When the first spring 7 is in its natural state, it pushes the annular sleeve 6 to the left, keeping the annular sleeve 6 in an extended state. An annular groove 601 is formed on the outer peripheral wall of the annular sleeve 6. The annular groove 601 is an annular groove surrounding the outer periphery of the annular sleeve 6.

[0021] The digital display module 2 has a sliding cavity 204 inside. The sliding cavity 204 is located on the right side of the countersunk hole 201 and is coaxially connected to the countersunk hole 201. The inner diameter of the sliding cavity 204 is larger than the inner diameter of the countersunk hole 201. A limiting ring 9 is slidably connected inside the sliding cavity 204. The limiting ring 9 is a circular ring structure and can slide up and down along the sliding cavity 204. The inner diameter of the limiting ring 9 is larger than the outer diameter of the annular sleeve 6, so that the annular sleeve 6 can slide axially through the limiting ring 9 without interference. The outer diameter of the cross-section of the limiting ring 9 is adapted to the bottom diameter of the annular groove 601, that is, the outer diameter of the circular cross-section of the limiting ring 9 is slightly smaller than the bottom diameter of the annular groove 601, so that the cross-section of the limiting ring 9 can enter the interior of the annular groove 601.

[0022] A sliding hole 202 is provided on the upper wall of the digital display module 2. The sliding hole 202 is a circular hole whose axis extends along the vertical direction of the digital display module 2. The lower end of the sliding hole 202 communicates with the sliding cavity 204. A pressing rod 4 is slidably connected inside the sliding hole 202. The pressing rod 4 is a cylindrical rod-shaped structure, and its lower end extends into the sliding cavity 204 and is fixedly connected to the upper wall of the limiting ring 9. The upper end of the pressing rod 4 can extend out of the upper wall of the digital display module 2 for the operator to press. The pressing rod 4 and the limiting ring 9 are integrally molded structures, made of metal or engineering plastic.

[0023] A spring hole 203 is provided on the lower wall of the sliding cavity 204. The spring hole 203 is a blind hole, and its axis extends along the vertical direction of the digital display module 2, with its lower end not penetrating the lower wall of the digital display module 2. A second spring 8 is provided inside the spring hole 203. The second spring 8 is a compression spring, with its lower end abutting against the bottom wall of the spring hole 203 and its upper end abutting against the lower wall of the limiting ring 9. In its natural state, the second spring 8 pushes the limiting ring 9 upward.

[0024] When the annular sleeve 6 is in the extended state, the limiting ring 9 is located on the right side of the annular groove 601, and the upper end of the pressing rod 4 is flush with or slightly lower than the upper wall of the digital display module 2. When the annular sleeve 6 is pushed back into the countersunk hole 201 by the outer peripheral wall of the tool holder body 1, the first spring 7 is compressed to absorb the impact energy. When the annular sleeve 6 retracts to the position where its left end face is flush with the left wall of the digital display module 2, the annular groove 601 on the annular sleeve 6 moves axially to the left to the position aligned with the limiting ring 9. At this time, the second spring 8 pushes the limiting ring 9 upward, and the cross-section of the limiting ring 9 enters the annular groove 601, forming an axial lock on the annular sleeve 6, preventing the annular sleeve 6 from retracting to the right or further to the left.

[0025] During this process, the upper end of the pressing rod 4 extends out of the upper wall of the digital display module 2, and the operator can observe the protruding state of the pressing rod 4 and obtain tactile and visual feedback that the installation is in place.

[0026] After installation, the digital display module 2 is attached to the outer peripheral wall of the tool holder body 1 via the magnetic attraction structure 5. The annular sleeve 6 is locked in the retracted state by the limiting ring 9. The elastic reaction force of the first spring 7 is transmitted to the limiting ring 9 through the annular groove 601 of the annular sleeve 6, and then to the cavity wall of the sliding cavity 204 through the limiting ring 9, and is finally borne by the housing of the digital display module 2. This elastic reaction force is not transmitted to the tool holder body 1, and therefore does not counteract the magnetic attraction force generated by the magnetic attraction structure 5.

[0027] When it is necessary to disassemble the digital display module 2, the operator presses down on the upper end of the pressing rod 4. The pressing rod 4 drives the limiting ring 9 downward, causing the cross-section of the limiting ring 9 to disengage from the annular groove 601, thus releasing the axial lock on the annular sleeve 6. The first spring 7 releases its elastic potential energy, pushing the annular sleeve 6 to the left to return to its extended state. At the same time, the outer peripheral wall of the annular sleeve 6 contacts the limiting ring 9, keeping it in the disengaged position. The upper end of the pressing rod 4 falls back to a position flush with or slightly lower than the upper wall of the digital display module 2. At this time, the operator can remove the digital display module 2 from the tool holder body 1.

[0028] The charging module 3 is equipped with a charging slot 301, the shape of which is adapted to the shape of the digital display module 2 for insertion and charging. A charging cable 302 is located at the rear end of the charging module 3 for connecting to an external power source. After use, the digital display module 2 is placed back into the charging slot 301 for charging to ensure sufficient power for the next use.

[0029] As an alternative to this embodiment, the cross-sectional shape of the limiting ring 9 can be rectangular, trapezoidal, or other geometric shapes that match the bottom diameter of the annular groove 601. When the cross-section of the limiting ring 9 is rectangular, its contact area with the annular groove 601 increases, resulting in a more stable lock. When the cross-section of the limiting ring 9 is circular, processing is simpler and the cost is lower. Both solutions can achieve the axial locking function.

[0030] The working principle of this embodiment will be fully explained below.

[0031] The operator holds the digital display module 2 and moves its left wall toward the outer peripheral wall of the tool holder body 1. Since the annular sleeve 6 extends from the left wall of the digital display module 2 in its natural state, the left end of the annular sleeve 6 contacts the outer peripheral wall of the tool holder body 1 before the magnetic attraction structure 5. Continuing to push the digital display module 2, the outer peripheral wall of the tool holder body 1 applies a rightward thrust to the annular sleeve 6, pushing it to slide back to the right along the countersunk hole 201. During this process, the first spring 7 is compressed and absorbs the impact energy, and the permanent magnet block 501 does not bear any direct impact force.

[0032] As the annular sleeve 6 continues to retract, the distance between the left end of the annular sleeve 6 and the left wall of the digital display module 2 gradually decreases. Simultaneously, the distance between the permanent magnet 501 and the outer peripheral wall of the tool holder body 1 also decreases, and the magnetic attraction gradually strengthens. Because the annular sleeve 6 is always in contact with the tool holder body 1 before the permanent magnet 501, and due to the buffering effect of the first spring 7, the impact speed when the magnetic attraction structure 5 finally contacts the tool holder body 1 is significantly reduced, resulting in only a low-speed contact and no hard impact.

[0033] When the annular sleeve 6 retracts to a position where its left end face is flush with the left wall of the digital display module 2, the annular groove 601 on the annular sleeve 6 moves to a position where it is axially aligned with the limiting ring 9. At this time, the second spring 8 pushes the limiting ring 9 upward, and the cross-section of the limiting ring 9 enters the annular groove 601, forming an axial lock on the annular sleeve 6. During this process, the upper end of the pressing rod 4 extends out of the upper wall of the digital display module 2, providing the operator with a confirmation signal that the installation is in place.

[0034] At this time, the permanent magnet 501 of the magnetic attraction structure 5 is attached to the outer peripheral wall of the tool holder body 1 through the flexible protective layer 502, and the magnetic attraction force firmly fixes the digital display module 2 to the tool holder body 1. The annular sleeve 6 is locked in the retracted state by the limiting ring 9. The compression reaction force of the first spring 7 is transmitted to the cross section of the limiting ring 9 through the annular groove 601 of the annular sleeve 6, and then to the inner wall of the sliding cavity 204 through the outer peripheral wall of the limiting ring 9. Finally, it is borne by the housing of the digital display module 2 in the form of internal stress. This reaction force is not transmitted to the outer peripheral wall of the tool holder body 1, so it does not cancel or weaken the magnetic attraction force.

[0035] After the operator completes the tool adjustment operation, the digital display module 2 is removed from the tool holder body 1. The removal method is as follows: press down on the upper end of the pressing rod 4. The pressing rod 4 drives the limiting ring 9 downwards, causing the cross-section of the limiting ring 9 to disengage from the annular groove 601. The first spring 7 releases its compression energy, pushing the annular sleeve 6 to the left to return to its extended state. At this point, the operator can overcome the magnetic attraction and pull the digital display module 2 away from the tool holder body 1.

[0036] In this embodiment, the intelligent CNC tool is fixed to the digital display module 2 and the tool holder body 1 only by magnetic attraction during operation. The protective structure does not apply any spring-induced force to the tool holder body 1, thus not affecting the stability of the magnetic fixation. Simultaneously, since the annular sleeve 6 is locked in the retracted state, the external dimensions of the digital display module 2 are completely consistent with those of a conventional digital display module without a protective structure. There are no additional protrusions, and it will not interfere with the workpiece or the inner wall of the machine tool during cutting.

[0037] As a further preferred embodiment, the flexible protective layer 502 is a polytetrafluoroethylene (PTFE) coating with a thickness of 0.15 mm, covering the left end face and peripheral wall of the permanent magnet block 501. This serves two purposes: firstly, it isolates the permanent magnet block 501 from direct rigid contact with the surface of the tool holder body 1; secondly, it provides a certain degree of self-lubrication during long-term use, reducing wear caused by repeated contact. Alternatively, the flexible protective layer 502 can be a polyurethane elastomer coating, which has better elastic deformation capacity than PTFE and better impact absorption, but its wear resistance is slightly lower than PTFE. The appropriate coating can be selected based on the actual operating conditions.

[0038] In a preferred embodiment, the inner wall of the charging slot 301 of the charging module 3 is provided with an elastic positioning structure to elastically clamp the digital display module 2 when it is inserted for charging, ensuring stable charging contact. The end of the charging cable 302 is provided with a USB interface or a dedicated power adapter interface for connecting an external power adapter. The charging module 3 internally includes a charging management circuit to manage the charging process and prevent overcharging.

[0039] As a further extension of this embodiment, the integral structure of the limiting ring 9 and the pressing rod 4 can be integrally molded by injection molding, and the material is polyoxymethylene or nylon, which has good wear resistance and dimensional stability. The material of the annular sleeve 6 is preferably polyoxymethylene or copper alloy, wherein polyoxymethylene has good self-lubricating properties, which can reduce sliding friction with the inner wall of the countersunk hole 201, and copper alloy has better wear resistance and impact resistance, which is suitable for use scenarios with frequent installation and disassembly. The materials of the first spring 7 and the second spring 8 are preferably piano wire or stainless steel wire. Piano wire has a high elastic limit, which is suitable for buffering scenarios with high-frequency compression, while stainless steel wire has better corrosion resistance, which is suitable for cutting fluid environments. The permanent magnet block 501 is preferably a neodymium iron boron permanent magnet, which has a high magnetic energy product and can generate sufficient magnetic attraction force in a small volume to ensure the fixed reliability of the digital display module 2 and the tool holder body 1.

[0040] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. An intelligent CNC cutting tool, comprising a tool holder body (1), a digital display module (2) detachably adsorbed onto the outer peripheral wall of the tool holder body (1), and a charging module (3) for charging the digital display module (2), wherein the digital display module (2) is provided with a magnetic attraction structure (5) for generating magnetic attraction force; characterized in that: The digital display module (2) is provided with a protective structure for protecting the magnetic structure (5) during installation.

2. The intelligent CNC cutting tool according to claim 1, characterized in that: The protective structure includes a countersunk hole (201) on the left wall of the digital display module (2), and the magnetic structure (5) is fixed inside the countersunk hole (201), and the left end face of the magnetic structure (5) does not protrude from the left wall of the digital display module (2).

3. The intelligent CNC cutting tool according to claim 2, characterized in that: The protective structure also includes an annular sleeve (6) slidably connected within the countersunk hole (201), the annular sleeve (6) being used to contact the outer peripheral wall of the tool holder before the magnetic attraction structure during installation; a first spring (7) is provided between the right end of the annular sleeve (6) and the inner right wall of the countersunk hole (201), the first spring (7) being used to provide the sleeve with a tendency to extend to the left; the outer peripheral wall of the annular sleeve (6) is provided with an annular groove (601).

4. The intelligent CNC cutting tool according to claim 3, characterized in that: The protective structure also includes a sliding cavity (204) inside the digital display module (2) and a sliding hole (202) on the upper wall of the digital display module (2); a limiting ring (9) is slidably connected in the sliding cavity (204), and a pressing rod (4) is slidably connected in the sliding hole (202). The lower end of the pressing rod (4) is fixedly connected to the limiting ring (9); the inner diameter of the limiting ring (9) is larger than the outer diameter of the annular sleeve (6); the cross-sectional dimensions of the limiting ring (9) are adapted to the bottom diameter of the annular groove (601). When the annular sleeve (6) is pressed into the locking position where its left end face is flush with the left wall of the digital display module (2), the limiting ring (9) is axially aligned with the annular groove (601).

5. The intelligent CNC cutting tool according to claim 4, characterized in that: The protective structure also includes a spring hole (203) provided on the lower wall of the sliding cavity (204) and a second spring (8) provided in the spring hole (203). The second spring (8) is used to push the limiting ring (9) upward; the upper end of the second spring (8) abuts against the lower wall of the limiting ring (9).

6. The intelligent CNC cutting tool according to claim 1, characterized in that: The magnetic attraction structure (5) includes a permanent magnet block (501) and a flexible protective layer (502) covering the surface of the permanent magnet block (501). The flexible protective layer (502) is used to isolate the permanent magnet block (501) from direct rigid contact with the surface of the tool holder body (1).

7. The intelligent CNC cutting tool according to claim 4, characterized in that: The limiting ring (9) has a circular cross-sectional shape, and the outer diameter of its cross-sectional circle is smaller than the bottom diameter of the ring groove (601).

8. The intelligent CNC cutting tool according to claim 3, characterized in that: The first spring (7) is fixedly connected to the right end of the annular sleeve (6) and the inner right wall of the countersunk hole (201).

9. The intelligent CNC cutting tool according to claim 1, characterized in that: The charging module (3) is provided with a charging slot (301) for the digital display module (2) to be inserted for charging, and the rear end of the charging module (3) is provided with a charging cable (302) for connecting to an external power source.

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