Numerical control grinding machine tool for milling high-precision self-locking shaft body

Abstract

The high-precision self-locking shaft body milling numerical control grinding machine tool comprises a bottom frame and an upper shell, and is characterized in that a first movable mounting base is arranged on the left side of the upper end of the bottom frame, a milling base is arranged at the upper end of the first movable mounting base, and a self-locking shaft body assembly is arranged at the upper end of the milling base; a bidirectional motor is arranged at the left end of the milling base, and the right end of an output shaft of the bidirectional motor penetrates through the milling base to be fixedly connected with a workpiece clamping base. A liquid storage tank is arranged at the upper end of the upper shell, a liquid conveying pipe is arranged at the lower end of the liquid storage tank, the lower end of the liquid conveying pipe penetrates through the upper shell to be connected with a through-flow valve, and the lower end of the through-flow valve is connected with a liquid outlet pipe; by arranging the self-locking shaft body assembly, the shaft body limiting assembly and the first shifting rod, full-process mechanical self-locking of automatic feeding, automatic clamping, quantitative spraying of cooling liquid, machining and automatic material loosening is achieved, centered limiting clamping of various milling cutters is ensured, the deviation angle of clamping installation of the milling cutters is reduced, the yield is increased, and the problem of response lag of a traditional clamp is solved.

Description

Technical Field

[0001] This invention relates to the field of CNC grinding machine tool technology, and in particular to a high-precision self-locking CNC grinding machine tool for milling shafts. Background Technology

[0002] Milling refers to cutting workpieces using a rotating multi-edged cutting tool. Milling is generally performed on milling machines or boring machines and is suitable for machining planes, grooves, various shaped surfaces, and special shapes of molds. In the existing technology, the milling cutter holder is affected by rotation and vibration during operation. After long-term use at high frequency, the milling cutter is prone to installation deviation and downward tilting, which leads to deviation in machining accuracy and reduces the yield. Therefore, we designed a high-precision self-locking CNC grinding machine tool for milling shafts.

[0003] Chinese invention patent CN202410974735.8 discloses a machine tool for milling workpieces, including a machine body and a machining tool, a housing located on top of the machine body, a drive component disposed inside the housing, a motor fixedly disposed inside the machine body, a control component locking the transmission component when it is in the locked position, and releasing the transmission component when the control component is pressed to the release position by the shaft, and the transmission component is translated by the drive component pressing the blocking component, causing the shaft to come into contact with the motor and be restricted by the locking component. By controlling the components to detect deviations between the cutting tool and the spindle in a timely manner, operators can adjust and correct the position of the milling cutter promptly, reducing the scrap rate caused by substandard machining accuracy. After the cutting tool moves out of the product, the spindle is locked by locking components to lock the cutting tool, protecting the equipment itself from serious damage and effectively ensuring the stability and controllability of the production process. However, this equipment has the following problems: Firstly, it does not have the adaptability to different specifications of milling cutters and cannot ensure the centering and limiting of various milling cutters. Secondly, it does not have the full-process mechanical self-locking of "automatic feeding - automatic clamping - quantitative spraying of coolant - machining - automatic unloading" without manual intervention, which can continuously process and solve the problem of lag response of traditional fixtures. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by setting up a self-locking shaft assembly, a shaft limiting assembly, and a first lever. This solves the technical problems of milling cutter holders being affected by rotation and vibration during operation, and after long-term high-frequency use, milling cutters are prone to installation deviations and downward tilting, resulting in deviations in machining accuracy, reduced yield, and lag in response of traditional fixtures.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A high-precision self-locking shaft milling CNC grinding machine tool includes a base frame and an upper shell, characterized in that: a first movable mounting seat is provided at the upper left side of the base frame, a milling base is provided at the upper end of the first movable mounting seat, a self-locking shaft assembly is provided at the upper end of the milling base, and a bidirectional motor is provided at the left end of the milling base, with the right end of the output shaft of the bidirectional motor passing through the milling base to fix and connect to the workpiece holding seat;

[0007] The upper shell has a liquid storage tank at its upper end and a liquid delivery pipe at its lower end. The lower end of the liquid delivery pipe passes through the upper shell and connects to a flow valve. The lower end of the flow valve is connected to an outlet pipe.

[0008] As a preferred embodiment, the flow valve is provided with a rotary valve at its left end, and a lever is provided at the lower end of the rotary valve.

[0009] As a preferred embodiment, the right end of the milling base is provided with a decorative shell, the interior of the decorative shell is provided with a shaft limiting component, and the upper left side of the decorative shell is provided with a first movable cavity, and the upper right side of the decorative shell is provided with a second movable cavity. The shaft limiting component and the workpiece holding seat are located on the same axis.

[0010] As a preferred embodiment, the shaft limiting assembly includes a fixing plate, the right end of which is fixedly connected to a decorative outer shell, and the left end of the fixing plate abuts against a limiting ring at its center. A mounting block is provided on the upper left side of the fixing plate, and a micro motor is provided at the front end of the mounting block. The rear output shaft of the micro motor passes through the mounting block to be fixedly connected to a lead screw. A movable block is provided on the surface of the lead screw, and the right end of the movable block is fixedly connected to the limiting ring.

[0011] As a preferred embodiment, the outer circumference of the limiting ring is evenly distributed with three arc-shaped grooves, and a rectangular sleeve is provided in the groove. A straight rod is fitted on the inner surface of the rectangular sleeve. A roller is provided at the end of the straight rod near the center of the circle, and a fixed post is movably connected to the end of the straight rod away from the circle. A fixed plate is fixedly connected to the right end of the fixed post.

[0012] As a preferred embodiment, the self-locking shaft assembly includes a rodless cylinder, with a slider at the right end of the rodless cylinder. The right end of the slider is movably connected to a first drive shaft. A second lever is fixedly connected to the middle of the outer surface of the first drive shaft. A first drive wheel is located on the right side of the second lever, and a third lever is located below the second lever, with the third lever positioned to the left of the workpiece clamping seat.

[0013] As a preferred embodiment, the surface of the first transmission wheel is meshed with the second transmission wheel, the inner surface of the second transmission wheel is fixedly connected to the second transmission shaft, the outer surface of the second transmission shaft is movably connected to the Z-shaped rod, the left end of the Z-shaped rod is fixedly connected to the milling base, and the upper end of the Z-shaped rod is provided with an annular groove, the groove surface of the annular groove abutting against the first transmission shaft.

[0014] As a preferred embodiment, a ring is fixedly connected to the right side of the outer surface of the second drive shaft. The lower end of the ring is provided with a fourth lever, and the upper end of the ring is provided with a fifth lever and a sixth lever. The fifth lever is located in front of the sixth lever. The first lever is located between the fifth and sixth levers. The fourth lever is located between the mounting block and the moving block, and a pressure sensor is provided inside the lower end of the fourth lever.

[0015] As a preferred embodiment, a control computer is located at the front right side of the upper shell, and an observation door is located at the front left side of the upper shell. An emergency stop button is provided on the surface of the control computer.

[0016] The beneficial effects of this invention are:

[0017] (1) In this invention, by setting a self-locking shaft assembly, when the output shaft of the bidirectional motor rotates in the forward direction, the No. 3 lever installed on it rotates in the forward direction, thereby causing the No. 2 lever on the No. 1 transmission shaft to rotate, which in turn causes the No. 1 transmission wheel to drive the No. 2 transmission wheel to rotate, which causes the No. 2 transmission shaft to follow the transmission, and then causes the No. 4 lever on the ring to rotate until it abuts against the limiting ring to form, thus completing the position limitation of the limiting ring and preventing the shaft limiting assembly from being poorly centered due to vibration or long-term operation, thereby achieving mechanical self-locking; when the bidirectional motor rotates the output shaft in the reverse direction after one processing, the No. 2 lever rotates and resets with the No. 3 lever, which in turn causes the No. 1 transmission wheel to drive the No. 2 transmission wheel to rotate and reset, which in turn resets the ring, thus achieving full-process mechanical unlocking without manual intervention, allowing for continuous processing and solving the problem of lag response of traditional fixtures.

[0018] (2) In this invention, by setting a shaft limiting component, when the moving block gradually moves away from the mounting block under the action of the micro motor, it drives the limiting ring to rotate backward, and the straight rods restricted in the rectangular sleeve are pulled and move closer to each other, so that the roller floats and supports the milling cutter; otherwise, the roller releases the milling cutter. This structure ensures that the milling cutter is in a centered supporting state, prevents the milling cutter from deviating and affecting the machining accuracy, and increases the yield.

[0019] (3) In this invention, by setting a lever, when the ring rotates in the reverse direction under the forward rotation of the bidirectional motor, lever 6 abuts against lever 1 and rotates, so that the rotary valve opens and the flow valve is in the flow state. The coolant in the storage tank is sprayed from the outlet pipe to the milling cutter for cooling through the delivery pipe. When the ring rotates in the forward direction under the reverse rotation of the bidirectional motor, lever 5 abuts against lever 1 and rotates, so that the rotary valve closes, realizing automatic quantitative spraying of coolant without the need for additional power, saving time and effort.

[0020] In summary, this equipment has the advantages of simple structure and automatic feeding-automatic clamping-quantitative coolant injection-processing-automatic material release, making it particularly suitable for the field of CNC grinding machine tool technology. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 A schematic diagram of the overall structure of a CNC grinding machine tool for milling self-locking shafts.

[0023] Figure 2 This is a schematic diagram of the structure of the milled base section.

[0024] Figure 3 This is a partial structural diagram of the self-locking shaft assembly.

[0025] Figure 4 A cross-sectional structural diagram of the decorative outer shell.

[0026] Figure 5 This is a structural schematic diagram of the shaft limiting assembly. Detailed Implementation

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0028] Example 1

[0029] like Figures 1 to 5As shown, this invention provides a high-precision self-locking shaft milling CNC grinding machine tool, including a base frame 1 and an upper shell 2. The base frame 1 has a first movable mounting seat 3 located on its upper left side, which drives the milling base 4 to move back and forth, realizing automatic feeding of the milling cutter. The first movable mounting seat 3 is a conventional moving feeding structure on a grinding machine, which will not be described in detail here. The upper end of the first movable mounting seat 3 has a milling base 4, providing installation space for the self-locking shaft assembly 5 and the bidirectional motor 6. The upper end of the milling base 4 has a self-locking shaft assembly 5, which limits the position of the limiting ring 132, preventing poor centering of the shaft limiting assembly due to vibration or long-term operation, thus achieving mechanical self-locking and reset. It requires manual intervention, can process continuously, and has a bidirectional motor 6 at the left end of the milling base 4. The bidirectional motor 6 switches the current path through the control circuit to change the direction of interaction between the armature and the magnetic field, thereby realizing forward and reverse rotation. Its core advantage is that it can flexibly respond to external signals to adjust the running direction. The flexibility of the bidirectional motor 6 makes it suitable for scenarios that require frequent changes in direction. The bidirectional motor 6 is controlled by the control computer 14. The right end of the output shaft of the bidirectional motor 6 passes through the milling base 4 to be fixedly connected to the workpiece holding seat 7. When the bidirectional motor 6 is working, its output shaft rotates and drives the workpiece holding seat 7 to rotate. The workpiece holding seat 7 is used to automatically clamp one end of the milling cutter. It is a conventional grinding machine holding structure, and its operation is controlled by the control computer 14.

[0030] The upper shell 2 has a liquid storage tank 8 at its upper end and a liquid delivery pipe 9 at its lower end. The lower end of the liquid delivery pipe 9 passes through the upper shell 2 and connects to a flow valve 10. The lower end of the flow valve 10 is connected to an outlet pipe 11. The liquid storage tank 8 stores a large amount of coolant. When the flow valve 10 is in the flow state, the coolant flows from the liquid storage tank 8 through the liquid delivery pipe 9 and is sprayed out through the outlet pipe 11 to cool the cutting position of the milling cutter.

[0031] Furthermore, such as Figure 2 As shown, the left end of the flow valve 10 is equipped with a rotary valve 101, which is a torsion type switch valve. The lower end of the rotary valve 101 is equipped with a lever 102. When the ring 511 rotates in the reverse direction under the forward rotation of the bidirectional motor 6, the lever 514 abuts against the lever 102 and rotates, causing the rotary valve 101 to open and the flow valve 10 to be in a flow state. The coolant in the storage tank 8 is sprayed from the outlet pipe 11 through the delivery pipe 9 onto the machining position of the milling cutter for cooling. When the ring 511 rotates in the forward direction under the reverse rotation of the bidirectional motor 6, the lever 513 abuts against the lever 102 and rotates, causing the rotary valve 101 to close. This realizes automatic quantitative injection of coolant without the need for additional power, saving time and effort.

[0032] Furthermore, the right end of the milling base 4 is provided with a decorative outer shell 12, and the interior of the decorative outer shell 12 is provided with a shaft limiting component 13. This structure ensures that the milling cutter is in a centered holding state, preventing the milling cutter from deviating and affecting the machining accuracy, and increasing the yield. The upper left side of the decorative outer shell 12 is provided with a first movable cavity 131, which provides space for the second lever 54 to rotate. The upper right side of the decorative outer shell 12 is provided with a second movable cavity 132, which provides space for the fourth lever 512 to rotate. The shaft limiting component 13 and the workpiece holding seat 7 are located on the same axis to ensure coaxiality, so that the milling cutter can be held horizontally.

[0033] Furthermore, such as Figure 4 As shown, the shaft limiting assembly 13 includes a fixing plate 131. The right end of the fixing plate 131 is fixedly connected to the decorative shell 12, and the left end of the fixing plate 131 is centrally located and abuts against the limiting ring 132. The limiting ring 132 moves with the moving block 136. The upper left side of the fixing plate 131 is provided with a mounting block 133 to provide a mounting position for the micro motor 134. The front end of the mounting block 133 is provided with the micro motor 134, which is controlled by the control computer 14. The rear output shaft of the micro motor 134 passes through the mounting block 133 to be fixedly connected to the lead screw 135. The surface of the lead screw 135 is provided with a moving block 136. The right end of the moving block 136 is fixedly connected to the limiting ring 132. The micro motor 134 works in conjunction with the lead screw 135 to convert the rotational kinetic energy of the micro motor 134 into linear motion, so that the moving block 136 can move back and forth, and the limiting ring 132 rotates accordingly.

[0034] Furthermore, three arc-shaped grooves 137 are evenly distributed on the outer circumference of the limiting ring 132 to provide installation space for the rectangular sleeve 138. The rectangular sleeve 138 is provided in the groove of the arc-shaped groove 137 to limit the movement trajectory of the straight rod 139. The straight rod 139 is sleeved on the inner surface of the rectangular sleeve 138. A roller 1310 is provided at the end of the straight rod 139 near the center. The two are movably connected by a rotating rod. When the roller 1310 abuts against the milling cutter, the milling cutter rotates under the action of the bidirectional motor 6, and the roller 1310 also rolls accordingly, always forming a three-point floating plus with the milling cutter. The roller 1310 holds the milling cutter in a centered position to prevent it from shifting and affecting machining accuracy, thus increasing the yield rate. The end of the straight rod 139 furthest from the circular end is movably connected to the fixing post 1311. The right end of the fixing post 1311 is fixedly connected to the fixing plate 131. When the moving block 136 moves away from the mounting block 133 under the action of the micro motor 134, it drives the limiting ring 132 to rotate backward. The straight rods 139, which are confined in the rectangular sleeve 138, are pulled closer to each other, so that the roller 1310 floats and holds the milling cutter. Conversely, the roller 1310 releases the milling cutter.

[0035] Furthermore, such as Figure 2 As shown, the self-locking shaft assembly 5 includes a rodless cylinder 51, which is controlled by a control computer 14. When the pressure sensor on the fourth lever 512 transmits a pressure signal to the processor in the control computer 14, the processor feeds back to the controller, which controls the rodless cylinder 51 to work. The slider 52 slides upward, driving the first drive shaft 53 to move upward, causing the second lever 54 to disengage from the movement range of the third lever 56, thus stopping the second drive shaft 58 from rotating. When the milling is finished, the processor in the control computer 14 controls the bidirectional motor 6 to rotate in the opposite direction according to the programming settings, while simultaneously controlling the rodless cylinder 51 to work, causing the slider 52 to drive the first drive shaft 53 to reset. The right end of the rodless cylinder 51 is provided with a slider 52, and the right end of the slider 52 is movably connected to the first drive shaft 53. The outer surface of the slider 52... The device has mounting holes with evenly distributed shallow teeth on the surface. A shallow groove is fitted to the left side of the outer surface of the first drive shaft 53. The shallow teeth and groove match, increasing the friction between the slider 52 and the first drive shaft 53, ensuring that the first drive shaft 53 receives sufficient external force to rotate. A second lever 54 is fixedly connected to the middle of the outer surface of the first drive shaft 53. A first drive wheel 55 is located to the right of the second lever 54, and a third lever 56 is located below the second lever 54, positioned to the left of the workpiece holder 7. When the output shaft of the bidirectional motor 6 rotates in the forward direction, the third lever 56 mounted on it rotates in the forward direction. If the second lever 54 is within the range of motion of the third lever 56, it causes the second lever 54 on the first drive shaft 53 to rotate; otherwise, the second lever 54 remains stationary.

[0036] Furthermore, such as Figure 4 As shown, the surface of the first transmission wheel 55 is meshed with the second transmission wheel 57. The inner surface of the second transmission wheel 57 is fixedly connected to the second transmission shaft 58. The outer surface of the second transmission shaft 58 is movably connected to the Z-shaped rod 59. The structure between the second transmission shaft 58 and the Z-shaped rod 59 is the same as the structure between the slider 52 and the first transmission shaft 53, so that the second transmission shaft 58 can rotate only when it receives sufficient external force. The left end of the Z-shaped rod 59 is fixedly connected to the milling base 4, and the upper end of the Z-shaped rod 59 is provided with an annular groove 510. The groove surface of the annular groove 510 abuts against the first transmission shaft 53. The annular groove 510 is used to limit the vertical movement position of the first transmission shaft 53.

[0037] Furthermore, a ring 511 is fixedly connected to the right side of the outer surface of the second drive shaft 58. The lower end of the ring 511 is equipped with a fourth lever 512. When the output shaft of the bidirectional motor 6 rotates in the forward direction, the third lever 56 mounted on it rotates in the forward direction, thereby causing the second lever 54 on the first drive shaft 53 to rotate. This further causes the first drive wheel 55 to drive the second drive wheel 57 to rotate, causing the second drive shaft 58 to follow the transmission. This, in turn, causes the fourth lever 512 on the ring 511 to rotate until it abuts against the limiting ring 132, forming a self-locking mechanism. The upper end of the ring 511 is equipped with a fifth lever 513 and a sixth lever 514, with the fifth lever 513 located in front of the sixth lever 514. The first lever 102 is located between the fifth lever 513 and the sixth lever 514. When the ring 511 rotates in the reverse direction under the forward rotation of the bidirectional motor 6, it causes... The sixth lever 514 abuts against the first lever 102 and rotates, causing the rotary valve 102 to open and the flow valve 10 to be in a flowing state. The coolant in the storage tank 8 is sprayed from the outlet pipe 11 through the delivery pipe 9 onto the machining position of the milling cutter for cooling. When the ring 511 rotates forward under the reverse rotation of the bidirectional motor 6, the fifth lever 513 abuts against the first lever 102 and rotates, causing the rotary valve 101 to close, realizing automatic quantitative injection of coolant without the need for additional power. The fourth lever 512 is located between the mounting block 133 and the moving block 136, and a pressure sensor is installed inside the lower end of the fourth lever 512. When the fourth lever 512 abuts against the limit ring 132, the pressure sensor detects the pressure value and feeds back the information to the processor in the control computer 14. The processor feeds back to the controller, and the controller controls the rodless cylinder 51 to work.

[0038] Furthermore, such as Figure 1 As shown, a control computer 14 is located on the front right side of the upper shell 2, which is used to control the operation of the power components of the entire grinding machine. It includes a processor and controller, a touch screen, function buttons, etc., and integrates a PLC control system. It can preset at least 5 clamping parameters for shaft workpieces, including clamping force threshold, coolant injection volume, and bidirectional motor speed. It supports parameter adjustment and storage via the touch screen. An observation door 15 is located on the front left side of the upper shell 2, which facilitates personnel to observe the working conditions inside the grinding machine. An emergency stop button 16 is located on the surface of the control computer 14. When an abnormal meshing of the first transmission wheel 55 with the second transmission wheel 57 is detected, an emergency stop is automatically triggered and the power supply to the bidirectional motor is cut off.

[0039] Working process: First, the operator sets essential parameters such as workpiece price difference, clamping force threshold, coolant spray volume, and bidirectional motor speed via the control computer. Then, the output shaft of the bidirectional motor 6 rotates forward, causing the third lever 56 mounted on it to rotate forward, which in turn causes the second lever 54 on the first drive shaft 53 to rotate. This further causes the first drive wheel 55 to drive the second drive wheel 57 to rotate, causing the second drive shaft 58 to follow suit. This, in turn, causes the fourth lever 512 on the ring 511 to rotate until it abuts against the limit ring 132. Simultaneously, when the ring 511 rotates in the reverse direction under the forward rotation of the bidirectional motor 6, the sixth lever 514 abuts against the first lever 102 and rotates, opening the rotary valve 102 and putting the flow valve 10 in a flowing state. The coolant in the reservoir 8 is sprayed from the outlet pipe 11 through the delivery pipe 9 onto the milling cutter's machining position for cooling. Finally, the pressure sensor detects the pressure value and feeds back the information to the control computer 1. The processor within the control computer 14 feeds back to the controller, which then controls the rodless cylinder 51 to operate. Further, the rodless cylinder 51 operates, causing the slider 52 to slide upwards, moving the first drive shaft 53 upwards. This disengages the second lever 54 from the range of motion of the third lever 56, stopping the second drive shaft 58 from rotating. Further, the milling cutter is automatically fed for machining. Further, after the milling is completed, the processor within the control computer 14, according to the programming settings, controls the bidirectional motor 6 to rotate in the opposite direction while simultaneously controlling the rodless cylinder 51 to operate. This causes the slider 52 to drive the first drive shaft 53 to reset, and the first drive wheel 55 meshes with the second drive wheel 57. Further, since the second lever 54 is within the range of motion of the third lever 56, it causes the second lever 54 on the first drive shaft 53 to rotate and reset. Simultaneously, the ring 511 rotates forward, causing the fourth lever 512 to reset, and the fifth lever 513 to abut against the first lever 102 and rotate, closing the rotary valve 101.

[0040] In the description of this invention, it should be understood that the terms "front and back", "left and right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or component 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 the invention.

[0041] Of course, those skilled in the art should understand that the term "a" should be understood as "at least one" or "one or more". That is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple. The term "a" should not be understood as a limitation on the quantity.

[0042] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art under the technical guidance of the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A high-precision self-locking shaft milling CNC grinding tool, comprising a base frame (1) and an upper shell (2), characterized in that: The base frame (1) has a first movable mounting seat (3) on the upper left side. The first movable mounting seat (3) has a milling base (4) on its upper end. The milling base (4) has a self-locking shaft assembly (5) on its upper end. The milling base (4) has a bidirectional motor (6) on its left end. The right end of the output shaft of the bidirectional motor (6) passes through the milling base (4) to fix and connect to the workpiece holding seat (7). The upper shell (2) has a liquid storage tank (8) at its upper end and a liquid delivery pipe (9) at its lower end. The lower end of the liquid delivery pipe (9) passes through the upper shell (2) and connects to a flow valve (10). The lower end of the flow valve (10) is connected to an outlet pipe (11).

2. The high-precision self-locking CNC grinding tool for milling shafts according to claim 1, characterized in that, The left end of the flow valve (10) is provided with a rotary valve (101), and the lower end of the rotary valve (101) is provided with a lever (102).

3. The high-precision self-locking CNC grinding tool for milling shafts according to claim 1, characterized in that, The right end of the milling base (4) is provided with a decorative shell (12), the interior of the decorative shell (12) is provided with a shaft limiting component (13), and the upper left side of the decorative shell (12) is provided with a first movable cavity (131), and the upper right side of the decorative shell (12) is provided with a second movable cavity (132). The shaft limiting component (13) and the workpiece holding seat (7) are located on the same axis.

4. A high-precision self-locking CNC grinding tool for milling shafts according to claim 3, characterized in that, The shaft limiting assembly (13) includes a fixing plate (131), the right end of which is fixedly connected to the decorative shell (12), and the left end of the fixing plate (131) abuts against the limiting ring (132) at the center position. A mounting block (133) is provided on the upper left side of the fixing plate (131). A micro motor (134) is provided at the front end of the mounting block (133). The rear output shaft of the micro motor (134) passes through the mounting block (133) to fixally connect to the lead screw (135). A moving block (136) is provided on the surface of the lead screw (135). The right end of the moving block (136) is fixedly connected to the limiting ring (132).

5. A high-precision self-locking CNC grinding tool for milling shafts according to claim 4, characterized in that, The outer circumference of the limiting ring (132) has three arc-shaped grooves (137) evenly distributed. A rectangular sleeve (138) is provided in the groove of the arc-shaped groove (137). A straight rod (139) is sleeved on the inner surface of the rectangular sleeve (138). A roller (1310) is provided at one end of the straight rod (139) near the center of the circle. A fixed post (1311) is movably connected to the end of the straight rod (139) away from the circle. A fixed plate (131) is fixedly connected to the right end of the fixed post (1311).

6. A high-precision self-locking CNC grinding tool for milling shafts according to claim 1, characterized in that, The self-locking shaft assembly (5) includes a rodless cylinder (51), a slider (52) is provided at the right end of the rodless cylinder (51), the right end of the slider (52) is movably connected to a first transmission shaft (53), a second lever (54) is fixedly connected to the middle of the outer surface of the first transmission shaft (53), a first transmission wheel (55) is provided on the right side of the second lever (54), and a third lever (56) is provided below the second lever (54), and the third lever (56) is located on the left side of the workpiece holding seat (7).

7. A high-precision self-locking CNC grinding tool for milling shafts according to claim 6, characterized in that, The surface of the first transmission wheel (55) is meshed with the second transmission wheel (57). The inner surface of the second transmission wheel (57) is fixedly connected to the second transmission shaft (58). The outer surface of the second transmission shaft (58) is movably connected to the Z-shaped rod (59). The left end of the Z-shaped rod (59) is fixedly connected to the milling base (4), and the upper end of the Z-shaped rod (59) is provided with an annular groove (510). The groove surface of the annular groove (510) abuts against the first transmission shaft (53).

8. A high-precision self-locking CNC grinding tool for milling shafts according to claim 7, characterized in that, A ring (511) is fixedly connected to the right side of the outer surface of the second drive shaft (58). The lower end of the ring (511) is provided with a fourth lever (512), and the upper end of the ring (511) is provided with a fifth lever (513) and a sixth lever (514). The fifth lever (513) is located in front of the sixth lever (514). The first lever (102) is located between the fifth lever (513) and the sixth lever (514). The fourth lever (512) is located between the mounting block (133) and the moving block (136). A pressure sensor is provided inside the lower end of the fourth lever (512).

9. A high-precision self-locking CNC grinding tool for milling shafts according to claim 1, characterized in that, A control computer (14) is provided on the right front side of the upper shell (2), and an observation door (15) is provided on the left front side of the upper shell (2). An emergency stop button (16) is provided on the surface of the control computer (14).

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