Lead screw feeding mechanism for numerical control machine tool

Abstract

The invention discloses a lead screw feeding mechanism for a numerical control machine tool, and relates to the technical field of numerical control machine tools. Comprising a support, a fixing seat and a supporting seat are installed on the support, the fixing seat and the supporting seat are jointly provided with a lead screw, and an installation seat located between the fixing seat and the supporting seat is installed on the lead screw. Fixing pieces are detachably connected to the opposite sides of the fixing base and the supporting base and the two sides of the mounting base, organ shells are arranged between the mounting base and the fixing base and between the mounting base and the supporting base, and rotating shells are slidably connected into the organ shells. Through the combined design of the organ shell and the rotating shell, rapid maintenance and repair and modular replacement are integrated, through the rotatable opening and closing structure, rapid maintenance and replacement of the protection assembly are achieved on the premise that core components are not disassembled, and the maintainability, practicability and economical efficiency of equipment are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of CNC machine tool technology, and in particular to a lead screw feed mechanism for CNC machine tools. Background Technology

[0002] The feed mechanism of a CNC machine tool is a core component ensuring machining accuracy and smooth motion. The leadscrew, as a key transmission element converting rotary motion into linear motion, directly affects the overall accuracy and reliability of the machine tool. In actual working environments, leadscrews are often exposed to contaminants such as chips, coolant, and dust, which can easily lead to wear, corrosion, or decreased accuracy. Therefore, current technologies commonly use bellows-style protective covers (also known as telescopic covers) to seal and protect the leadscrew. These flexible, foldable covers extend and retract with the leadscrew during movement, thus isolating it from external impurities.

[0003] However, this traditional protection method has significant shortcomings in actual use and maintenance. When the bellows cover is partially damaged due to long-term use, mechanical impact, or material aging, contaminants can enter the interior of the cover along the damaged area, accelerating screw wear and affecting transmission accuracy. In this case, replacing the damaged cover usually requires disassembling the support seats at both ends of the screw, the coupling, and even part of the guide rail assembly before the cover can be removed and replaced. This process is cumbersome, time-consuming, and requires readjusting the screw's installation accuracy, demanding a high level of technical skill from the operators. In continuous production or high-volume processing, frequent maintenance downtime severely impacts machine tool availability and production efficiency.

[0004] Therefore, there is an urgent need for a feed mechanism design that can effectively protect the lead screw and facilitate quick replacement or maintenance of the protective cover, in order to solve the problems of high maintenance complexity and long downtime in the existing technology. Summary of the Invention

[0005] In order to overcome the shortcomings mentioned in the background art, the present invention provides a lead screw feed mechanism for CNC machine tools.

[0006] The technical solution is as follows: A lead screw feed mechanism for a CNC machine tool includes a bracket, on which a fixed seat and a support seat are mounted. A lead screw is mounted on both the fixed seat and the support seat. A drive module for rotating the lead screw is located on one side of the bracket. A mounting seat is mounted on the lead screw between the fixed seat and the support seat. A limit module is mounted on the bracket to limit the position of the mounting seat. Fixed plates are detachably connected to the opposite sides of the fixed seat and the support seat, as well as to both sides of the mounting seat. A bellows housing is provided between the mounting seat and the fixed seat, and between the mounting seat and the support seat. The bellows housing is detachably connected to the corresponding fixed plate. A rotating shell is slidably connected inside the bellows housing. The bellows housing and the corresponding rotating shell together protect the lead screw.

[0007] As a preferred embodiment of the present invention, the projections of the accordion shell and the rotating shell onto the support base are both arc-shaped, and the angle of the central angle corresponding to the arc is greater than 180°.

[0008] As a preferred embodiment of the present invention, the accordion shell is provided with a plurality of equidistantly distributed limiting grooves, and the rotating shell is provided with limiting parts of the same number as the limiting grooves, the limiting parts being located within the corresponding limiting grooves.

[0009] As a preferred embodiment of the present invention, both the limiting groove and the limiting part are arc-shaped, and the radial cross-section of the limiting part is also arc-shaped. The width of the opening of the limiting groove is smaller than the diameter of the circle containing the radial cross-section of the limiting part.

[0010] As a preferred embodiment of the present invention, the accordion shell is fixedly connected with a plurality of fixing parts, and the inner and outer sides of the rotating shell are provided with centrally symmetrically distributed adhesive parts, and the fixing parts and the corresponding adhesive parts together fix the accordion shell and the rotating shell.

[0011] As a preferred embodiment of the present invention, a limiting component is further included. The limiting component is disposed between the fixed base and the support base. The limiting component is used to improve the levelness of the accordion shell. The limiting component includes a limiting rod, which is fixedly connected between the fixed base and the support base. A movable ring is provided on the side of the accordion shell near the limiting rod. The movable ring is sleeved on the limiting rod. A movable column is fixedly connected to the mounting base. The movable column is slidably connected to the limiting rod.

[0012] As a preferred embodiment of the present invention, the movable column is provided with symmetrically distributed inclined portions for cleaning the limiting rod.

[0013] In a preferred embodiment of the present invention, the length of the movable column is greater than the length of the mounting base.

[0014] As a preferred embodiment of the present invention, it further includes a number of limiting rings equal to the number of the bellows shells. The bellows shells and rotating shells between the support base and the mounting base, and between the fixed base and the mounting base, are arranged in a linear array of several. The fixed base, the support base, and the mounting base are detachably connected to their respective bellows shells. Each limiting ring is fixed to one side of a corresponding bellows shell, and a connecting ring is fixed to the other side of the bellows shell. The number of moving rings is equal to the number of limiting rings. Each limiting ring is detachably connected to its corresponding moving ring and its corresponding connecting ring. Rigid portions are provided on both sides of the rotating shell, and each limiting ring and connecting ring is rotatably connected to its corresponding rigid portion.

[0015] As a preferred embodiment of the present invention, the projection of the connecting ring on the horizontal plane is located within the projection of the corresponding limiting ring on the horizontal plane.

[0016] Beneficial effects: This invention integrates rapid maintenance and modular replacement through the combination design of the accordion shell and the rotating shell. The rotatable opening and closing structure enables rapid maintenance and replacement of protective components without disassembling the core components, which significantly improves the maintainability, practicality and economy of the equipment.

[0017] By modularizing the accordion shell and rotating shell, adjacent accordion shells can be spliced ​​together. This allows for easy replacement of any damaged accordion shell or rotating shell by simply removing the connection between the fixing and adhesive parts of the corresponding unit and unloading the module, without disassembling the entire structure. This greatly simplifies the maintenance process, and partial replacement avoids scrapping the entire unit, reducing material waste. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional structural diagram of the fixing base and the support base of the present invention; Figure 3 This is a three-dimensional structural diagram of the fixing piece and the bellows shell of the present invention; Figure 4 This is a three-dimensional structural cross-sectional view of the mounting base of the present invention; Figure 5 This is a three-dimensional structural diagram of the accordion shell and the rotating shell of the present invention; Figure 6 This is a three-dimensional structural diagram of the limiting ring and connecting ring of the present invention; Figure 7 This is an exploded three-dimensional view of the accordion shell and rotating shell of the present invention; Figure 8 For the present invention Figure 6 Enlarged view of the mechanical structure at point A.

[0019] Wherein: 1-bracket, 2-fixed seat, 3-support seat, 4-lead screw, 5-mounting seat, 6-limiting module, 61-fixing piece, 7-accordion shell, 8-rotating shell, 9-limiting groove, 10-limiting part, 101-fixing part, 102-adhesive part, 11-limiting rod, 12-moving ring, 13-moving column, 14-limiting ring, 15-connecting ring, 16-rigid part. Detailed Implementation

[0020] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention.

[0021] Example 1

[0022] Considering that when the bellows cover used in the feed mechanism of existing CNC machine tools is damaged and needs to be replaced, it is usually necessary to first disassemble the support seats, couplings and even part of the guide rail assembly at both ends of the lead screw before the cover can be removed from the lead screw and replaced. The whole process is cumbersome and time-consuming, and the installation accuracy of the lead screw needs to be readjusted. This requires high technical skills from the operators and reduces the availability and production efficiency of the machine tool. Therefore, this invention proposes a lead screw feed mechanism for CNC machine tools.

[0023] Please see Figures 1-6 The lead screw feed mechanism includes a bracket 1, on which a fixed seat 2 and a support seat 3 are mounted. The fixed seat 2 and the support seat 3 are jointly provided with a lead screw 4. A drive module for rotating the lead screw 4 is provided on one side of the bracket 1. A mounting seat 5 located between the fixed seat 2 and the support seat 3 is mounted on the lead screw 4. A limit module 6 is installed on the bracket 1 to limit the mounting seat 5. Fixing plates 61 are detachably connected to the opposite sides of the fixed seat 2 and the support seat 3, as well as to both sides of the mounting seat 5. A bellows shell 7 is provided between the mounting seat 5 and the fixed seat 2, and between the mounting seat 5 and the support seat 3. The bellows shell 7 is detachably connected to the corresponding fixing plate 61. A rotating shell 8 is slidably connected inside the bellows shell 7. The bellows shell 7 and the corresponding rotating shell 8 are used together to protect the lead screw 4.

[0024] In the above scheme, bracket 1 is installed on a CNC machine tool during actual use. Several bearings are installed in both the fixed base 2 and the support base 3. The lead screw 4 is fixedly connected to the inner ring of the bearings in both. The drive module on bracket 1 is an existing device; the figure shows a motor as an example. The output shaft of the motor is connected to the right end of the lead screw 4 via a coupling. A detachable connector (existing device) threaded to the lead screw 4 is installed in the mounting base 5. The limit module 6 is an existing device; the figure shows two guide rails, two moving blocks, and a fixed plate for placing the machining device, symmetrically distributed front and rear, as an example. As shown, the moving block is slidably connected to the corresponding guide rail, and both moving blocks and the mounting base 5 are fixedly connected to the fixed part; the bellows shell 7 and the rotating shell 8 are both made of elastic deformable material, and both can be compressed to produce deformation. At the same time, the outer side of the rotating shell 8 is attached to the inner side of the bellows shell 7. In this embodiment, there is one bellows shell 7 in each group and one rotating shell 8 in each group. The fixed base 2, the support base 3 and the mounting base 5 are detachably connected to the corresponding bellows shell 7. The rotating shell 8 is also bellows type, and the minimum diameter of the inner circle of the rotating shell 8 is greater than the outer diameter of the lead screw 4.

[0025] Please see Figure 5 The projections of the accordion shell 7 and the rotating shell 8 onto the support base 3 are both arc-shaped, and the angle of the central angle corresponding to the arc is greater than 180°. This ensures that after the rotating shell 8 rotates 180° relative to the corresponding accordion shell 7, the accordion shell 7 and the rotated shell 8 can form a closed tube. At the same time, the rotating shell 8 is limited so that it cannot separate from the corresponding accordion shell 7 under the action of gravity.

[0026] Please see Figures 6-8 The accordion shell 7 is provided with several equidistantly distributed limiting grooves 9, and the rotating shell 8 is provided with limiting parts 10 in the same number as the limiting grooves 9, with the limiting parts 10 located in the corresponding limiting grooves 9.

[0027] In the above scheme, the limiting groove 9 is located on the protrusion of the bellows shell 7, the limiting part 10 is located on the protrusion of the rotating shell 8, and the limiting part 10 is made of rigid material to improve the rigidity of the bellows shell 7 and the rotating shell 8.

[0028] Please see Figures 6-8 Both the limiting groove 9 and the limiting part 10 are arc-shaped, and the radial section of the limiting part 10 is also arc-shaped. The width of the opening of the limiting groove 9 is smaller than the diameter of the circle in which the radial section of the limiting part 10 is located, which is used to reduce the resistance during the rotation of the rotating shell 8. The width of the opening of the limiting guide section is smaller than the diameter of the limiting part 10, which is used to ensure the stability of the connection between the two and reduce the probability of the two separating.

[0029] Please see Figure 6 and Figure 7The accordion shell 7 is fixed with several fixing parts 101, and the inner and outer sides of the rotating shell 8 are provided with centrally symmetrically distributed adhesive parts 102. The fixing parts 101 and the corresponding adhesive parts 102 together fix the accordion shell 7 and the rotating shell 8.

[0030] In the above solution, the fixing part 101 is an existing device. In this embodiment, the specific number of fixing parts 101 on the same accordion shell 7 can be selected by the staff. The fixing parts 101 on the same accordion shell 7 are divided into two groups that are symmetrically distributed front and back. The fixing parts 101 and the corresponding adhesive parts 102 together form Velcro. When the rotating shell 8 is not rotating, the fixing part 101 adheres to the adhesive part 102 on the inner side of the corresponding rotating shell 8, thereby fixing the rotating shell 8 and the accordion shell 7.

[0031] The specific workflow of the above scheme is as follows: When this feeding mechanism is needed, the operator shall pre-install the fixed base 2, support base 3, lead screw 4, mounting base 5, and limit module 6 according to the existing feeding mechanism assembly method. After installation, the operator shall install the two bellows shells 7 and the two rotating shells 8 according to the following operation: Four fixing plates 61 are fixed to the right side of the fixing base 2, the left side of the support base 3, and the left and right sides of the mounting base 5 using bolts. After fixing, the workers fix the left and right sides of the two bellows shells 7 to the corresponding fixing plates 61 (fixing methods include bolt fixing, adhesive bonding, etc.). After the two bellows shells 7 are installed, the workers unfasten the adhesive parts 101 to the corresponding adhesive parts 102 on the inner side of the corresponding rotating shell 8. Then, the right rotating shell 8 is rotated so that it rotates relative to the right bellows shell 7. The rotating shell 8 drives all the limiting parts 10 on it to rotate. Rotate the corresponding limiting groove 9 until the right rotating shell 8 rotates 180°. Then, stop rotating the rotating shell 8 and use the right fixing part 101 to stick and fix it to the corresponding adhesive part 102 on the outside of the right rotating shell 8 to ensure the stability of the rotating shell 8. Then, rotate the left rotating shell 8 according to the above operation and fix it. The two bellows shells 7 and the two rotating shells 8 together shield the lead screw 4, isolate the debris, oil and other impurities that fall during the processing, provide a clean and safe working environment for the lead screw 4, and thus extend the service life of the lead screw 4.

[0032] After both rotating shells 8 are adjusted, the operator installs the feed mechanism in the designated position on the CNC machine tool and connects the drive module to the intelligent control panel of the CNC machine tool. The intelligent control panel controls the opening and closing of the drive module and sets the opening and closing interval of the drive module. After installation, the intelligent control panel starts the drive module, which drives the lead screw 4 to rotate. The lead screw 4 drives the mounting base 5 to move to the left (during this process, the mounting base 5 is limited by the limit module 6 and cannot rotate synchronously with the lead screw 4). During the movement of the mounting base 5, the mounting base 5 squeezes the left bellows shell 7 and rotating shell 8, causing them to contract and deform. At the same time, the mounting base 5 applies a pulling force to the right bellows shell 7 and rotating shell 8 during the movement to the left, causing them to be stretched, thus always blocking the lead screw 4.

[0033] If the right-side accordion shell 7 or rotating shell 8 is damaged and needs to be replaced during normal use, the operator should release the fixing part 101 on the right side from the corresponding adhesive part 102, then rotate the rotating shell 8 180° so that the rotating shell 8 is rotated relative to the accordion shell 7 to the initial position. Then, release the fixing part 7 on the right side from the two fixing pieces 61 to remove the right-side accordion shell 7 and rotating shell 8. No additional operation is required, making the entire disassembly process faster. After removal, the operator should install the intact accordion shell 7 and rotating shell 8 on the right side of the mounting base 5 according to the above operation for subsequent use.

[0034] Example 2

[0035] Based on Example 1, this example aims to optimize the levelness of the accordion shell during use.

[0036] Please see Figures 2-4 It also includes a limiting component, which is disposed between the fixed base 2 and the support base 3. The limiting component is used to improve the levelness of the bellows shell 7. The limiting component includes a limiting rod 11, which is fixedly connected between the fixed base 2 and the support base 3. A movable ring 12 is provided on the side of the bellows shell 7 near the limiting rod 11. The movable ring 12 is sleeved on the limiting rod 11. A movable column 13 is fixedly connected to the mounting base 5. The movable column 13 is slidably connected to the limiting rod 11.

[0037] In the above scheme, the limiting rod 11 is a rigid rod, and the central axis of the limiting rod 11 is located above the central axis of the lead screw 4; in this embodiment, the moving ring 12 is located on the upper side of the bellows shell 7, and the two are detachably connected. The inner diameter of the moving ring 12 is larger than the diameter of the limiting rod 11, and there is a gap between the upper side of the bellows shell 7 and the limiting rod 11 to accommodate the change in diameter of the bellows shell 7 during deformation; the specific number of moving rings 12 on the same bellows shell 7 can be selected by the operator; the moving column 13 is located on the upper side of the mounting base 5.

[0038] Please see Figure 4 The movable column 13 is provided with symmetrically distributed inclined parts, which are symmetrically distributed from left to right, so that the movable column 13 can scrape and clean the impurities on the limit rod 11 through its inclined parts during the movement.

[0039] Please see Figure 4 The length of the movable column 13 is greater than the length of the mounting base 5. During the process of the movable column 13 cleaning the impurities on the limit rod 11, the volume of impurities falling onto the mounting base 5 is reduced, ensuring the cleanliness of the mounting base 5.

[0040] The specific workflow of the above scheme is as follows: After adjusting the position of the right rotating shell 8 as described above, the staff uses the existing device to fix the right organ shell 7 to the corresponding moving ring 12 (the fixation between the two can be done by means of bonding, etc.). All the moving rings 12 on the right side and the limiting rod 11 together limit the right organ shell 7, ensuring the stability of the shape of the organ shell 7, suppressing its sagging in the middle due to gravity, ensuring the overall levelness of the organ shell 7, and thus maintaining the constant gap between the organ shell 7 and the lead screw 4, providing a stable and reliable working space for the lead screw 4, and ensuring its normal operation.

[0041] As the mounting base 5 moves to the left, the two organ shells 7 drive their respective moving rings 12 to move to the left in sync, causing the moving rings 12 to slide to the left along the limiting rod 11. During this process, the left organ shell 7 is compressed and its diameter increases, thereby applying an upward force to the moving ring 12 on it. Meanwhile, the right organ shell 7 is stretched and its diameter decreases, thereby applying a downward force to the moving ring 12 on it. The moving ring 12 also limits the movement of the right organ shell 7, improving the stability of the organ shell 7 after being stretched and suppressing the sagging of its middle part.

[0042] Example 3

[0043] Based on Example 2, this example further designs the accordion shell and the rotating shell to optimize their assembly and disassembly process.

[0044] Please see Figure 6It also includes a number of limiting rings 14 equal to the number of organ shells 7. The organ shells 7 and rotating shells 8 between the support base 3 and the mounting base 5, and between the fixed base 2 and the mounting base 5, are arranged in a linear array. The fixed base 2, the support base 3, and the mounting base 5 are detachably connected to the corresponding organ shells 7. The limiting rings 14 are fixed to one side of the corresponding organ shell 7. A connecting ring 15 is fixed to the other side of the organ shell 7. The number of moving rings 12 is equal to the number of limiting rings 14. The limiting rings 14 are detachably connected to the corresponding moving rings 12. The limiting rings 14 are detachably connected to the corresponding connecting rings 15. Rigid parts 16 are provided on both sides of the rotating shell 8. The limiting rings 14 and the connecting rings 15 are rotatably connected to the corresponding rigid parts 16.

[0045] In the above scheme, the specific number of accordion shell 7 and rotating shell 8 will not be described in detail, but will be determined by the staff. The length of accordion shell 7 and rotating shell 8 is the same. The limiting ring 14 and the connecting ring 15 are both made of rigid material and can be bonded together. The rigid part 16 on the same rotating shell 8 is located on its left and right sides. The rigid part 16 is used to maintain the stability of the shape of the rotating shell 8.

[0046] Please see Figure 6 The projection of the connecting ring 15 on the horizontal plane is located within the projection of the corresponding limiting ring 14 on the horizontal plane. The limiting ring 14 blocks the connecting ring 15, thereby blocking the connection between the two and reducing the probability of impurities entering between them during the use of this feeding mechanism, thus improving the stability of the connection between the two.

[0047] The specific workflow of the above scheme is as follows: Before using this feeding mechanism, the operator selects an appropriate number of bellows shells 7 and rotating shells 8 according to the specific length of the lead screw 4. Then, the multiple bellows shells 7 are spliced ​​together as shown in the figure. During splicing, the limiting ring 14 on the left bellows shell 7 is fixed to the connecting ring 15 on the adjacent right bellows shell 7. When two bellows shells 7 are spliced ​​together, the two rotating shells 8 fit together. After all the bellows shells 7 are spliced, the operator installs the spliced ​​bellows shells 7 and rotating shells 8 in the designated position according to the above operation, and splices the limiting ring 14 with the corresponding moving ring 12 in sequence. After the installation is completed, the operator can rotate the rotating shells 8 in sequence according to the above operation so that the rotating shells 8 and the adjacent bellows shells 7 form a complete circular tube, and the two are fixed by the corresponding fixing part 101. Then the feeding mechanism can be put into use.

[0048] During the use of this feeding mechanism, if any of the bellows shells 7 or any of the rotating shells 8 are damaged, they can be replaced independently. For example, when the leftmost component is damaged, it is only necessary to release the fixing between the rotating shell 8 and the corresponding bellows shell 7, as well as the fixing between the limiting ring 14 and the corresponding moving ring 12, so that the damaged bellows shell 7 and rotating shell 8 can be removed and replaced as independent units without disassembling the components in other positions. This makes the entire replacement process simpler and faster, reduces maintenance time and workload, and also avoids the material waste caused by overall replacement, thus reducing maintenance costs.

[0049] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A lead screw feed mechanism for a CNC machine tool, characterized in that, The system includes a bracket (1), on which a fixed seat (2) and a support seat (3) are mounted. A lead screw (4) is mounted on both the fixed seat (2) and the support seat (3). A drive module for rotating the lead screw (4) is located on one side of the bracket (1). A mounting seat (5) is mounted on the lead screw (4) between the fixed seat (2) and the support seat (3). A limit module (6) is mounted on the bracket (1) to limit the position of the mounting seat (5). Fixing plates (61) are detachably connected to the opposite sides of the fixed base (2) and the support base (3) and to both sides of the mounting base (5). A bellows shell (7) is provided between the mounting base (5) and the fixed base (2) and between the mounting base (5) and the support base (3). The bellows shell (7) is detachably connected to the corresponding fixing plate (61). A rotating shell (8) is slidably connected inside the bellows shell (7). The bellows shell (7) and the corresponding rotating shell (8) are used together to protect the lead screw (4).

2. The lead screw feed mechanism for CNC machine tools according to claim 1, characterized in that, The projections of the accordion shell (7) and the rotating shell (8) onto the support base (3) are both arc-shaped, and the angle of the central angle corresponding to the arc is greater than 180°.

3. A lead screw feed mechanism for a CNC machine tool according to claim 1, characterized in that, The accordion shell (7) is provided with a plurality of equidistantly distributed limiting grooves (9), and the rotating shell (8) is provided with limiting parts (10) in the same number as the limiting grooves (9), and the limiting parts (10) are located in the corresponding limiting grooves (9).

4. A lead screw feed mechanism for a CNC machine tool according to claim 3, characterized in that, Both the limiting groove (9) and the limiting part (10) are arc-shaped, and the radial section of the limiting part (10) is also arc-shaped. The width of the opening of the limiting groove (9) is smaller than the diameter of the circle containing the radial section of the limiting part (10).

5. A lead screw feed mechanism for a CNC machine tool according to claim 3, characterized in that, The accordion shell (7) is fixed with a number of fixing parts (101), and the rotating shell (8) is provided with centrally symmetrically distributed adhesive parts (102) on both the inner and outer sides. The fixing parts (101) and the corresponding adhesive parts (102) together fix the accordion shell (7) and the rotating shell (8).

6. A lead screw feed mechanism for a CNC machine tool according to claim 5, characterized in that, It also includes a limiting component, which is disposed between the fixed seat (2) and the support seat (3). The limiting component is used to improve the levelness of the accordion shell (7). The limiting component includes a limiting rod (11), which is fixed between the fixed seat (2) and the support seat (3). A movable ring (12) is provided on the side of the accordion shell (7) near the limiting rod (11). The movable ring (12) is sleeved on the limiting rod (11). A movable column (13) is fixed to the mounting seat (5). The movable column (13) is slidably connected to the limiting rod (11).

7. A lead screw feed mechanism for a CNC machine tool according to claim 6, characterized in that, The movable column (13) is provided with symmetrically distributed inclined parts for cleaning the limiting rod (11).

8. A lead screw feed mechanism for a CNC machine tool according to claim 6, characterized in that, The length of the movable column (13) is greater than the length of the mounting base (5).

9. A lead screw feed mechanism for a CNC machine tool according to claim 6, characterized in that, It also includes a number of limiting rings (14) equal to the number of the organ shells (7). The organ shells (7) and the rotating shells (8) between the support base (3) and the mounting base (5) and between the fixed base (2) and the mounting base (5) are all arranged in a linear array. The fixed base (2), the support base (3) and the mounting base (5) are detachably connected to the corresponding organ shells (7). The limiting rings (14) are fixed to one side of the corresponding organ shell (7). A connecting ring (15) is fixed to the other side of the accordion shell (7). The number of moving rings (12) is the same as the number of limiting rings (14). The limiting ring (14) is detachably connected to the corresponding moving ring (12). The limiting ring (14) is detachably connected to the corresponding connecting ring (15). Rigid parts (16) are provided on both sides of the rotating shell (8). The limiting ring (14) and the connecting ring (15) are rotatably connected to the corresponding rigid parts (16).

10. A lead screw feed mechanism for a CNC machine tool according to claim 9, characterized in that, The projection of the connecting ring (15) onto the horizontal plane lies within the projection of the corresponding limiting ring (14) onto the horizontal plane.

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