A vertical feed transmission mechanism for precision machine tools

Abstract

This utility model discloses a vertical feed transmission mechanism for a precision machine tool, specifically relating to the field of machine tool processing technology. It is mounted on a fixed table, on which a drive motor is installed. The drive motor is connected to a transmission mechanism, which includes a lead screw and a movable slider mounted on the lead screw. A locking assembly is located at the end of the lead screw near the fixed table. The locking assembly includes a support rod extending axially along the lead screw from the fixed table, a limiting member on the support rod, and a locking member on the movable slider that cooperates with the limiting member. A buffer mechanism is located at the end of the lead screw away from the fixed table. The buffer mechanism includes a fixed support and an elastic element. This utility model achieves mechanical locking by utilizing the interaction between the locking member and the limiting member in the locking assembly, preventing accidental displacement of the slider. The buffer mechanism forms a protective structure at the end of the lead screw, preventing rigid collisions of the slider and reducing the impact at the end of the movement, thereby ensuring the safety of the mechanism during operation.

Description

Technical Field

[0001] This utility model belongs to the field of machine tool processing technology, and specifically relates to a vertical feed transmission mechanism for a precision machine tool. Background Technology

[0002] In modern industrial manufacturing, precision machine tools, as core equipment for achieving high-precision parts machining, directly determine product quality and production efficiency. The vertical feed transmission mechanism, a key component of precision machine tools, plays a crucial role in driving the cutting tool or worktable to achieve precise vertical movement, and is widely used in industries with extremely high machining accuracy requirements, such as aerospace, automotive manufacturing, and precision instruments. With the continuous development of industrial technology, the market demands increasingly higher precision, surface quality, and processing efficiency for parts. This requires that the vertical feed transmission mechanism of precision machine tools not only possess high motion and positioning accuracy but also ensure stability, reliability, and safety during operation. Currently, most existing vertical feed transmission mechanisms use ball screws to transmit kinetic energy. However, in practical applications, although ball screws offer high driving efficiency, in situations such as sudden power outages or equipment malfunctions, the low coefficient of friction caused by the rolling of balls within the helical grooves prevents self-locking through frictional resistance. Consequently, the moving slider on the screw may accidentally slip due to gravity, causing damage to the screw and machine tool components, posing a significant safety hazard.

[0003] Therefore, this utility model proposes a vertical feed transmission mechanism for precision machine tools to solve the above problems. Utility Model Content

[0004] This invention provides a vertical feed transmission mechanism for a precision machine tool to solve at least one of the aforementioned technical problems.

[0005] The technical solution adopted by this utility model is as follows: a vertical feed transmission mechanism for a precision machine tool, installed on a fixed table, wherein a drive motor is provided on the fixed table, the drive motor is connected to a transmission mechanism, the transmission mechanism includes a lead screw and a movable slider provided on the lead screw, the lead screw is provided with a locking component for locking the movement, the locking component includes a support rod provided on the fixed table and extending along the axial direction of the lead screw, a limiting member provided on the support rod, and a locking member provided on the movable slider and cooperating with the limiting member; a buffer mechanism is provided at the end of the lead screw away from the fixed table, the buffer mechanism including a fixed support and an elastic member.

[0006] In a preferred embodiment, the limiting member includes a plurality of limiting teeth spaced apart along the axial direction of the support rod, and the locking member includes a movable shaft disposed on the movable slider and a locking wheel disposed on the movable shaft. The locking wheel is provided with locking teeth adapted to the limiting teeth and a fixing member for locking the rotation of the locking wheel.

[0007] In a preferred embodiment, the fixing member is a T-shaped pin, and the movable slider is provided with a locking hole that cooperates with the T-shaped pin, so as to fix the engagement of the locking tooth and the limiting tooth through the cooperation of the fixing member and the locking hole.

[0008] In a preferred embodiment, the limiting member is an electromagnetic lock core evenly distributed along the axial direction of the support rod, and the locking member includes an electromagnetic chuck fixedly connected to the movable slider, with the electromagnetic lock core and the electromagnetic chuck corresponding in position.

[0009] In a preferred embodiment, the fixed support is located at the end of the lead screw away from the fixed platform, one end of the elastic element is fixedly connected to the fixed support, and the other end is provided with a buffer pad; the elastic element includes a buffer spring sleeved on the outside of the lead screw.

[0010] In a preferred embodiment, the elastic element includes a hydraulic damper fixed to the fixed support; the buffer pad is made of polyurethane elastic material.

[0011] In a preferred embodiment, the buffer mechanism further includes a shock-absorbing pad fixed to the side of the fixed platform facing the transmission mechanism.

[0012] In a preferred embodiment, the lead screw is a trapezoidal lead screw, which is rotatably mounted on a fixed platform via a bearing seat. A limiting retaining ring is provided at one end of the trapezoidal lead screw near the fixed platform. The limiting retaining ring is threadedly connected to the lead screw and locked by a set screw.

[0013] Due to the adoption of the above technical solution, the beneficial effects achieved by this utility model are as follows: 1. In a preferred embodiment of this utility model, a locking component ensures motion accuracy, while a buffer mechanism reduces impact at the end of the motion. Specifically, in the locking component, the support rod and lead screw are arranged parallel to each other, and the limiting member on the support rod and the locking member on the movable slider form a mating positioning structure. When the movable slider moves to the target position, the locking member and the limiting member interact to achieve mechanical locking, preventing displacement of the slider due to external force or gravity. The buffer mechanism forms a protective structure at the end of the lead screw away from the fixed platform. When the movable slider moves to its travel limit, the elastic element absorbs impact energy through deformation, preventing a rigid collision between the slider and the fixed support, thereby ensuring the safety of the mechanism during operation.

[0014] 2. As a preferred embodiment of this utility model, by utilizing the limiting member to make multiple limiting teeth axially spaced along the support rod and matching the shape of the teeth on the chuck wheel, precise meshing is achieved to realize mechanical locking between the tooth surfaces, preventing the moving slider from displacing along the screw axis. Furthermore, the fixing member restricts the rotation of the chuck wheel through mechanical force, keeping the teeth and limiting teeth in a meshing state, and preventing the tooth surfaces from disengaging due to vibration or load.

[0015] Furthermore, when the fixing component is a T-shaped pin, the engagement with the locking hole achieves a locked state through rigid limiting. This rigid connection structure firmly fixes the locking wheel and the moving slider into one unit. Even when subjected to external forces such as vibration and cutting force during processing, it can ensure stable engagement between the locking teeth and the limiting teeth, effectively preventing the position drift of the moving slider. This design can achieve stable locking of the fixing component through mechanical limiting, which greatly improves the positioning accuracy and working safety of the transmission mechanism.

[0016] 3. In a preferred embodiment of this utility model, the electromagnetic lock core and the electromagnetic chuck achieve positioning and locking through electromagnetic attraction. Specifically, when the electromagnetic lock core is energized, the coil generates a magnetic field that magnetizes the iron core, creating an electromagnetic attraction. The electromagnetic chuck, as a mating component, magnetically couples with the electromagnetic lock core at a corresponding position. When the moving slider reaches the target position, the electromagnetic lock core and the electromagnetic chuck at the corresponding position are precisely aligned. When both are energized, they generate a strong electromagnetic force, which magnetically attracts and rigidly connects the moving slider to the support rod, restricting the axial displacement of the slider. This structural design ensures positioning stability and avoids stress concentration caused by excessive locking, thereby effectively improving the automation level and operational reliability of the transmission mechanism.

[0017] 4. In a preferred embodiment of this utility model, the fixed support, buffer spring, and buffer pad in the buffer system work together to absorb and dampen the impact of the moving slider at the end of its stroke away from the fixed platform. Specifically, the kinetic energy of the slider is converted into the elastic potential energy of the spring through elastic deformation, thereby reducing the slider's speed, effectively mitigating the impact of the moving slider at the end of its stroke, protecting key components such as the lead screw and slider from damage, and thus extending the service life of the equipment.

[0018] Furthermore, when the elastic element is a hydraulic damper, the kinetic energy of the moving slider is converted into the heat energy of the hydraulic oil, achieving controllable deceleration and buffering, avoiding rigid impact. This not only achieves efficient absorption of impact energy but also ensures the smoothness of the buffering process, effectively reducing the impact damage of the moving slider to the transmission mechanism and reducing the impact of vibration on the machining accuracy of the machine tool.

[0019] Meanwhile, by setting up anti-vibration pads, the buffer mechanism can achieve bidirectional stroke protection. The anti-vibration pads effectively resist the impact of the transmission mechanism on the fixed table, avoid rigid impact, and minimize the impact of impact force on the machine tool's machining accuracy, component life and working environment.

[0020] 5. In a preferred embodiment of this utility model, the self-locking purpose is achieved through the trapezoidal screw thread structure characteristics and mechanical limit design, supplemented by the mechanical fixing of the limit retaining ring and the stable support of the bearing seat. These three elements work together to ensure that the system can reliably resist axial loads in a non-drive state, preventing accidental movement or loosening. Specifically, the design of the trapezoidal thread profile angle and thread helix angle ensures that the system meets the self-locking condition when the thread helix angle is less than the equivalent friction angle between the materials. At this time, the frictional torque generated by the axial load is sufficient to prevent the screw from rotating in the opposite direction without external force. Attached Figure Description

[0021] The accompanying drawings, which are provided to further illustrate the present invention and constitute a part of the present invention, illustrate exemplary embodiments of the present invention and are used to explain the present invention, but do not constitute an undue limitation of the present invention.

[0022] In the attached diagram: Figure 1 This is a schematic diagram of the vertical feed transmission mechanism for precision machine tools according to this utility model; Figure 2 for Figure 1 Enlarged view of point A in the middle; Figure 3 This is a structural diagram of a T-type pin; Figure 4 A schematic diagram of a lock core with an electromagnetic locking element as the limiting component; Figure 5 This is a schematic diagram of a hydraulic damper with an elastic element. Figure label: 1. Fixed work surface; 2. Drive motor; 3. Transmission mechanism; 31. Lead screw; 311. Trapezoidal lead screw; 312. Bearing housing; 313. Limiting ring; 314. Set screw; 32. Moving slider; 4. Locking assembly; 41. Support rod; 42. Limiting component; 421. Limiting tooth; 422. Electromagnetic lock cylinder; 43. Locking component; 431. Movable shaft; 432. Locking wheel; 433. Locking tooth; 434. T-pin; 4341. Locking hole; 435. Electromagnetic chuck; 5. Buffer mechanism; 51. Fixed support; 52. Elastic element; 521. Buffer spring; 522. Hydraulic damper; 53. Buffer pad; 54. Shock-absorbing pad. Detailed Implementation

[0023] To more clearly illustrate the overall concept of this utility model, a detailed description will be provided below with reference to the accompanying drawings.

[0024] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0025] Furthermore, it should be understood in the description of this utility model that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", 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 utility model 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 limitations on this utility model.

[0026] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0027] In this invention, unless otherwise expressly specified and limited, the first feature "on" or "below" the second feature may be in direct contact with the first and second features, or indirect contact through an intermediate medium. In the description of this specification, references to terms such as "implementation," "example," "aspect," or "specific example" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0028] Example 1: A preferred embodiment, such as Figure 1As shown, a precision machine tool vertical feed transmission mechanism 3 uses a drive motor 2 as a power source and achieves precise vertical feed through the helical transmission of a lead screw 31 and a moving slider 32. The locking component 4 and the buffer mechanism 5 respectively ensure positioning stability and operational safety. When the machine tool starts vertical feed operation, the drive motor 2 on the fixed table 1 receives the control signal and starts to run. Its output torque is transmitted to the lead screw 31 through the transmission connection, causing the lead screw 31 to rotate around its own axis. Since the movable slider 32 and the lead screw 31 are engaged through a threaded structure, the rotational motion of the lead screw 31 is converted into the linear motion of the movable slider 32 along the axial direction of the lead screw 31, thereby realizing the vertical lifting action of the worktable. When the movable slider 32 moves to the target processing position, the locking component 4 is activated to achieve precise positioning and fall protection. In the locking component 4, the support rod 41 extending along the axial direction of the lead screw 31 serves as the positioning reference. The limiting part 42 on its surface and the locking part 43 on the movable slider 32 form a cooperating relationship, rigidly locking the movable slider 32 in the target position and ensuring the positional stability during the processing.

[0029] If the slider moves to its maximum stroke away from the fixed platform 1 due to misoperation, the slider will first contact the elastic element 52 of the buffer mechanism 5. The elastic element 52 will be compressed or deformed to absorb the impact energy and achieve buffer protection. At the same time, the anti-vibration pad 54 is fixed on the side of the fixed platform 1 facing the transmission mechanism 3. When the slider moves to its maximum stroke closer to the fixed platform 1 due to misoperation, it can resist the impact force and achieve buffering, thereby ensuring the safety of the mechanism operation.

[0030] Example 2: like Figures 2-4As shown, a precision machine tool vertical feed transmission mechanism 3 differs from embodiment 1. The movable shaft 431 in the locking member 43 is mounted on the movable slider 32 and can rotate flexibly around its own axis. The locking wheel 432 fixedly installed on the movable shaft 431 rotates with the rotation of the movable shaft 431. The locking teeth 433 distributed on the edge of the locking wheel 432 are perfectly matched in size and tooth shape with the limiting teeth 421 spaced along the axial direction on the support rod 41, providing a structural basis for the precise meshing of the two. When the movable slider 32 moves axially under the drive of the lead screw 31, the locking teeth 433 and the limiting teeth 421 are fully engaged. At this time, the movable slider 32 moves together with the support rod 41 through the meshing of the teeth. When the movable slider 32 moves to the preset positioning point and needs to stop, the fixing component is activated. The fixing component is a T-shaped pin 434. The movable slider 32 is provided with a locking hole 4341 that matches the T-shaped pin 434. The T-shaped pin 434 is inserted into the locking hole 4341 through the pin rod, which rigidly restricts the rotational freedom of the locking wheel 432 and indirectly fixes the meshing state of the locking teeth 433 and the limiting teeth 421. The locking wheel 432 cannot rotate. The normal force between the tooth surfaces of the locking teeth 433 and the limiting teeth 421 forms a rigid constraint. At this time, the axial displacement of the movable slider 32 is strictly limited. Even if subjected to external loads such as machining vibration and cutting force, the position remains zero drift due to the shear strength and rigidity of the meshing structure. This working method, which uses the engagement of the limiting tooth 421 and the locking tooth 433 and the locking component to rotate the locking wheel 432, can achieve precise locking in multiple positions within the entire stroke range of the moving slider 32. The locking structure is simple and reliable, with strong load-bearing capacity, effectively ensuring the positioning accuracy and operational safety of the precision machine tool during vertical feed.

[0031] Furthermore, when the limiting member 42 is an electromagnetic lock core 422 evenly distributed along the axial direction of the support rod 41, and the locking member 43 is an electromagnetic chuck 435 fixedly connected to the movable slider 32, the positions of the electromagnetic lock core 422 and the electromagnetic chuck 435 correspond. When the movable slider 32 moves axially to the target position under the drive of the lead screw 31, the electromagnetic locking system starts working. The support rod 41 serves as the positioning reference. The electromagnetic lock core 422 has a built-in coil and iron core. Each lock core corresponds to a specific positioning node and maintains a positional correspondence with the electromagnetic chuck 435 fixedly connected to the movable slider 32. At this time, the control system accurately identifies the electromagnetic lock core 422 at the corresponding position based on the real-time position signal of the movable slider 32. After the locking command is triggered, the target electromagnetic lock core 422 and the electromagnetic chuck 435 are simultaneously powered on. When the coil of the electromagnetic lock core 422 is energized, it generates an electromagnetic field, magnetizing the iron core to form an electromagnet. The coil inside the electromagnetic chuck 435 is synchronously energized, generating a magnetic field with the opposite polarity to that of the electromagnetic lock core 422, creating a strong electromagnetic attraction between the two. Since the electromagnetic lock core 422 is fixed to the support rod 41, and the electromagnetic chuck 435 is rigidly connected to the movable slider 32, this attraction force firmly pulls the movable slider 32 towards the support rod 41, ensuring a tight fit. The electromagnetic force constrains the displacement of the movable slider 32 along the axial direction of the lead screw 31, achieving position locking. Compared to mechanical locking, electromagnetic locking eliminates the need for physical contact, avoiding mechanical wear and gap issues, and maintaining stable locking accuracy during high-frequency positioning.

[0032] Example 3: like Figure 1 and Figure 5As shown, a precision machine tool vertical feed transmission mechanism 3, differing from embodiment 1, uses a fixed support 51 as the basic support component of the buffer mechanism 5. This fixed support is securely mounted on the end of the lead screw 31 away from the fixed table 1, providing a rigid mounting reference for the entire buffer assembly. When the movable slider 32 moves axially away from the fixed table 1 under the drive of the lead screw 31, and is about to reach the end of its stroke, the buffer mechanism 5 begins to engage. The first component to contact the movable slider 32 is the buffer pad 53 located at the other end of the elastic element 52. The buffer pad 53 is typically made of polyurethane material with good elasticity and wear resistance. When the movable slider 32 contacts the buffer pad 53, the buffer pad 53 initially absorbs some of the impact energy through its elastic deformation, while simultaneously using the damping characteristics of the material to slow down the impact speed of the movable slider 32, thus playing a first-level buffering role and effectively reducing the rigid collision force between the movable slider 32 and the buffer mechanism 5. As the movable slider 32 continues to move towards the end point, the impact force is transmitted to the elastic element 52—the buffer spring 521 sleeved on the outside of the lead screw 31. One end of the buffer spring 521 is fixedly connected to the fixed support 51, and the other end is connected to the buffer pad 53. In its natural state, it maintains a certain preload or free length. When the buffer pad 53 is subjected to pressure from the moving slider 32, the pressure is transmitted to the buffer spring 521, causing the spring to be compressed axially along the lead screw 31. During compression, the buffer spring 521 converts the kinetic energy of the moving slider 32 into the elastic potential energy of the spring, gradually dissipating the impact energy through the spring's deformation process, forming a second layer of buffering. The spring's elastic coefficient is precisely designed to provide an appropriate buffering force based on the mass and speed of the moving slider 32, avoiding over- or under-buffering.

[0033] In addition, such as Figure 5 As shown, when the elastic element 52 is a hydraulic damper 522, as the moving slider 32 moves towards the end point, the impact force is transmitted to the hydraulic damper 522 in the elastic element 52 through the buffer pad 53. The hydraulic damper 522 is filled with a damping medium, such as hydraulic oil. When the piston rod contracts into the cylinder due to the pressure transmitted by the buffer pad 53, the damping medium is forced to flow through the damping orifice. Due to the throttling effect of the damping orifice, viscous resistance is generated during the flow of the damping medium, forming a damping force opposite to the direction of motion. This damping force is adaptively adjusted according to the movement speed of the moving slider 32—the faster the speed, the greater the damping force, which can quickly consume the kinetic energy of the moving slider 32; when the speed decreases, the damping force decreases accordingly to avoid generating excessive rebound force. Through the viscous energy dissipation of the damping medium, the hydraulic damper 522 converts the kinetic energy of the moving slider 32 into heat energy and releases it slowly, achieving a second layer of efficient buffering and effectively suppressing the impact vibration of the moving slider 32.

[0034] Example 4: like Figure 4As shown, a precision machine tool vertical feed transmission mechanism 3, differing from embodiment 1, uses a trapezoidal lead screw 311 as the core component of the transmission mechanism 3. Its thread adopts a trapezoidal tooth profile design, featuring high transmission efficiency, strong load-bearing capacity, and good self-locking performance. When the drive motor 2 outputs torque to the trapezoidal lead screw 311, the lead screw 311 forms a helical pair transmission with the moving slider 32 through the thread, precisely converting the rotational motion of the motor into the axial linear motion of the moving slider 32. During transmission, the large contact area of ​​the trapezoidal thread distributes the load, and the bearing seat 312 restricts the radial runout of the lead screw 31, ensuring smooth slider feeding without significant vibration or deviation. When the slider reaches the machining position, the drive motor 2 stops, and the trapezoidal lead screw 311 initially restricts the slider's downward movement due to the self-locking property of the thread, achieving dual positioning stability in conjunction with the locking component 4. If the buffer mechanism 5 fails due to a malfunction, the slider directly impacts the limit retaining ring 313 when moving upward. The retaining ring is forcibly stopped through rigid contact, and the set screw 314 bears shear force, ensuring that the retaining ring does not slide relative to the lead screw 31.

[0035] For any parts not mentioned in this utility model, existing technologies can be used or referenced.

[0036] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0037] The above description is merely an embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this utility model should be included within the scope of the claims of this utility model.

Claims

1. A vertical feed transmission mechanism for a precision machine tool, mounted on a fixed table (1), wherein the fixed table (1) is provided with a drive motor (2), and the drive motor (2) is connected to a transmission mechanism (3), characterized in that, The transmission mechanism (3) includes a lead screw (31) and a movable slider (32) disposed on the lead screw (31). The lead screw (31) is provided with a locking assembly (4) for locking the movement. The locking assembly (4) includes a support rod (41) disposed on a fixed platform (1) and extending along the axial direction of the lead screw (31), a limiting member (42) disposed on the support rod (41), and a locking member (43) disposed on the movable slider (32) and cooperating with the limiting member (42). The lead screw (31) is provided with a buffer mechanism (5) at one end away from the fixed platform (1). The buffer mechanism (5) includes a fixed support (51) and an elastic element (52).

2. The precision machine tool vertical feed transmission mechanism according to claim 1, characterized in that, The limiting member (42) includes a plurality of limiting teeth (421) spaced apart along the axial direction of the support rod (41). The locking member (43) includes a movable shaft (431) on the movable slider (32) and a locking wheel (432) on the movable shaft (431). The locking wheel (432) is provided with locking teeth (433) that are adapted to the limiting teeth (421) and a fixing member for locking the rotation of the locking wheel (432).

3. The precision machine tool vertical feed transmission mechanism according to claim 2, characterized in that, The fixing member is a T-shaped pin (434), and the movable slider (32) is provided with a locking hole (4341) that cooperates with the T-shaped pin (434) so ​​as to fix the engagement of the locking tooth (433) and the limiting tooth (421) through the cooperation of the fixing member and the locking hole (4341).

4. The precision machine tool vertical feed transmission mechanism according to claim 1, characterized in that, The limiting member (42) is an electromagnetic lock core (422) evenly distributed along the axial direction of the support rod (41), and the locking member (43) includes an electromagnetic chuck (435) fixedly connected to the movable slider (32). The electromagnetic lock core (422) and the electromagnetic chuck (435) are positioned corresponding to each other.

5. The precision machine tool vertical feed transmission mechanism according to claim 1, characterized in that, The fixed support (51) is located at the end of the lead screw (31) away from the fixed platform (1), and one end of the elastic element (52) is fixedly connected to the fixed support (51), and the other end is provided with a buffer pad (53). The elastic element (52) includes a buffer spring (521) sleeved on the outside of the lead screw (31).

6. The precision machine tool vertical feed transmission mechanism according to claim 5, characterized in that, The elastic element (52) includes a hydraulic damper (522) fixed to the fixed support (51); The cushioning pad (53) is made of polyurethane elastic material.

7. The precision machine tool vertical feed transmission mechanism according to claim 1, characterized in that, The buffer mechanism (5) also includes a shock-absorbing pad (54) fixed to the side of the fixed platform (1) facing the transmission mechanism (3).

8. The precision machine tool vertical feed transmission mechanism according to claim 1, characterized in that, The lead screw (31) is a trapezoidal lead screw (311). The trapezoidal lead screw (311) is rotatably mounted on the fixed platform (1) through the bearing seat (312). The trapezoidal lead screw (311) has a limiting ring (313) at one end near the fixed platform (1). The limiting ring (313) is threadedly connected to the trapezoidal lead screw (311) and locked by a set screw (314).

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