Intelligent machining control device and control method for CNC machine tools

Abstract

The present invention discloses an intelligent processing control device for a CNC machine tool, comprising: a processing chamber, a column, a tool magazine, a spindle box, and a spindle, wherein the column is arranged at the rear side of the processing chamber, the tool magazine is arranged at the left side of the processing chamber, the spindle box is arranged at the front side of the column in a liftable manner, and the spindle is rotatably mounted at the bottom of the spindle box. The device also comprises: a feed mechanism arranged at the front side of the column; and a protective mechanism arranged at the front side of the processing chamber. The intelligent processing control device and control method for a CNC machine tool can prevent the tool from colliding with the workbench or fixture, thereby preventing damage to the tool and the machine tool. The protective cover operates smoothly during opening and closing, and has an anti-collision function, preventing vibration from affecting the accuracy of the machine tool. At the same time, high-speed cutting is avoided when the protective cover is open, resulting in high safety.

Description

Technical Field

[0001] The present invention relates to the technical field of numerically controlled machine tools, and in particular to an intelligent machining control device and a control method for numerically controlled machine tools. Background Art

[0002] CNC machine tools are short for digitally controlled machine tools. They are automated machine tools equipped with a program control system. This control system can logically process programs specified by control codes or other symbolic instructions, decode them, and represent them in coded digital form. These are then input into the CNC device through an information carrier. After computational processing, the CNC device issues various control signals to control the movement of the machine tool and automatically process parts according to the shapes and sizes required by the drawings. CNC machine tools effectively solve the problems of complex, precise, small-batch, and multi-variety parts processing. They are flexible, high-efficiency automated machine tools, representing the development direction of modern machine tool control technology, and are typical mechatronics products.

[0003] At present, CNC machine tools are composed of CNC devices, bed, spindle box, feed system, tailstock, hydraulic system, cooling system, lubrication system, chip conveyor and other parts. The feed system consists of slide and worktable. When in use, the operator needs to use the CNC device to operate the tool setting to adjust the position of the workpiece in the machine tool coordinates. During the tool setting process, the protective cover needs to be opened, and the operator must observe the working status of the tool setting device closely.

[0004] In the existing technology, processes such as tool setting require the operation process to open the protective cover for close observation, and the protective cover cannot be self-locked, which has low safety. When the operator opens or closes the protective cover, it is easy to generate large vibrations, thereby affecting the accuracy of the CNC machine tool. In addition, during the processing process, the movement path of the tool is programmed and controlled by the operator. With a certain probability, the tool may collide with the workbench or fixture due to the operator's error, resulting in damage to the tool and damage to the CNC machine tool. Summary of the Invention

[0005] The object of the present invention is to provide an intelligent machining control device and a control method for a CNC machine tool, so as to at least solve the problem that the safety of the protective cover in the prior art is low and the machining process is prone to collision.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: an intelligent machining control device for a CNC machine tool, comprising: a machining chamber, a column, a tool magazine, a spindle box and a spindle, wherein the column is arranged at the rear side of the machining chamber, the tool magazine is arranged at the left side of the machining chamber, the spindle box is arranged at the front side of the column in a liftable manner, and the spindle is rotatably installed at the bottom of the spindle box, and further comprising: a feed mechanism arranged at the front side of the column; a protection mechanism arranged at the front side of the machining chamber; an operation panel arranged at the right end of the front side of the machining chamber, and the tool magazine, spindle box, feed mechanism and protection mechanism are all electrically connected to the operation panel; a handwheel is installed at the bottom of the operation panel through a wire and is electrically connected to the operation panel;

[0007] The purpose is to push the parts to be processed for feeding. The feeding mechanism includes: a slide, which is arranged on the front side of the processing chamber and is electrically connected to the operation panel; a workbench, which is arranged at the output end of the slide; and a turntable assembly, which is fixedly installed on the top of the workbench and is electrically connected to the operation panel.

[0008] The purpose is to smoothly process the curved surface. Preferably, the turntable assembly includes: a first motor, fixedly mounted on the top of the workbench and electrically connected to the operation panel; a rotating seat, rotatably mounted on the right side of the first motor, and fixedly connected to the output end of the first motor; a second motor, fixedly mounted on the right side of the rotating seat, and electrically connected to the operation panel; a rotating platform, rotatably mounted on the top of the second motor, and fixedly connected to the output end of the second motor; and a tool setting block, fixedly mounted on the rear end of the right side of the top of the first motor.

[0009] The purpose is to automatically control the protective cover. Preferably, the protective mechanism includes: a warehouse door, opened on the front side of the processing warehouse; a slide rail, arranged on the front side of the processing warehouse; a protective cover, slidably installed on the front side of the slide rail; a stop bar, fixedly installed on the front side of the processing warehouse, and the stop bar is arranged on the right side of the warehouse door; a drive component, arranged on the front top of the tool magazine, and electrically connected to the operation panel; a control component, arranged on the front side of the drive component, and electrically connected to the operation panel.

[0010] The purpose is to automatically control the opening and closing of the protective cover. Preferably, the driving assembly includes: a motor frame, which is arranged at the upper left corner of the front side of the tool magazine; a driving motor, which is fixedly installed on the left side of the motor frame and electrically connected to the operation panel; a mounting seat, which is arranged at the upper right corner of the front side of the processing chamber; a screw, one end of which is rotatably installed on the right side of the motor frame, and the other end is rotatably installed on the left side of the mounting seat, and the screw is fixedly connected to the output end of the driving motor; a box, which is fixedly installed at the upper right corner of the front side of the protective cover, and the screw is adapted to be plugged into the box; a slider, which is slidably installed on the inner cavity side wall of the box, and the screw is threadedly connected to the slider; a spring, one end of which is clamped to the right side of the slider, and the other end is clamped to the right side of the inner cavity of the box; a retaining ring, which is arranged on the right side of the inner cavity of the box, and the retaining ring is sleeved on the spring.

[0011] The purpose is to detect the position of the protective cover. Preferably, the control component includes: a limit block, which is arranged at the front right end of the box body; a first limit switch, which is fixedly installed on the front side of the slider and electrically connected to the operation panel; a second limit switch, which is fixedly installed on the front side of the mounting seat and electrically connected to the operation panel.

[0012] A control method for an intelligent machining control device of a CNC machine tool, comprising the following steps:

[0013] Step 1: During initial use, the turntable assembly is fixed to the top of the workbench with bolts. The operator controls the tool magazine through the panel in the slot to replace the bottom of the spindle with the tool setter. The operator controls the spindle to rotate at low speed using the handwheel and approaches the tool setting block for tool setting, thereby recording the position of the tool setting block in the machine tool coordinate system.

[0014] Step 2: The operator fixes the part to be processed on the top of the rotating platform, and controls the tool setter to set the part to be processed by the handwheel, and updates the origin of the part coordinate system;

[0015] Step 3: When the protective cover is open, neither the first limit switch nor the second limit switch detects the limit block, and the control panel limits the spindle speed, that is, tool setting can only be performed by low-speed rotation;

[0016] Step 4: The control panel controls the output end of the drive motor to drive the screw to rotate. Under the action of the thread lift between the screw and the slider, the box body and the protective cover are pushed to the right along the slide rail through the spring to close. When the protective cover is blocked, the slider continues to slide to the right. During this process, the spring is compressed and enters the inner cavity of the retaining ring. When the slider contacts the retaining ring, the first limit block touches the limit block, and the first limit block sends a signal to the control panel, and the control panel controls the drive motor to brake;

[0017] Step five: when the protective cover moves to the rightmost end, the limit block touches the second limit switch, and the second limit switch sends an in-position signal to the control panel. The drive motor continues to drive the slider to move to the right, and the spring is compressed into the inner cavity of the retaining ring. When the slider contacts the retaining ring, the first limit block touches the limit block, and the first limit block sends a signal to the control panel. The control panel controls the drive motor to brake, and the protective cover is completely closed. The first limit switch and the second limit switch detect the limit block at the same time, and the control panel unlocks the spindle speed, so that high-speed cutting can be performed.

[0018] The beneficial effects of the present invention compared with the prior art are:

[0019] 1. The present invention controls the spindle to rotate at a low speed by a hand wheel and approaches the tool setting block for tool setting, thereby recording the position of the tool setting block in the machine tool coordinate system, and thus recording the position occupied by the first motor. When the operator's programmed path coincides with the position occupied by the first motor, the control panel will not run the program to avoid a collision. Therefore, it can avoid the tool from colliding with the workbench or fixture due to operator error, resulting in damage to the tool and machine tool.

[0020] 2. The present invention controls the output end of the drive motor through the operation panel to drive the screw to rotate. Under the action of the thread lift between the screw and the slider, the box and the protective cover are pushed to the right along the slide rail through the spring. When the protective cover is blocked, the slider continues to slide to the right. During this process, the spring is compressed into the inner cavity of the retaining ring. When the slider contacts the retaining ring, the first limit block touches the limit block. The first limit block sends a signal to the operation panel, and the operation panel controls the drive motor to brake. Therefore, the protective cover runs smoothly during opening and closing, and has an anti-collision function to prevent vibration from affecting the accuracy of the machine tool.

[0021] 3. The present invention detects the position of the limit block by the first limit switch and the second limit switch. When the protective cover is opened, the first limit switch and the second limit switch do not detect the limit block. The control panel limits the rotation speed of the spindle, that is, the tool can only be set by low-speed rotation. When the protective cover is completely closed, the first limit switch and the second limit switch detect the limit block at the same time. The control panel unlocks the rotation speed of the spindle, so that high-speed cutting can be performed. Therefore, high-speed cutting is avoided when the protective cover is open, and safety is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the present invention;

[0023] Figure 2 This is the main view of the present invention;

[0024] Figure 3 This is the enlarged view of point A;

[0025] Figure 4This is an enlarged view of point B;

[0026] Figure 5 A top view of the present invention;

[0027] Figure 6 It is a right side view of the present invention;

[0028] Figure 7 Schematic diagram of the turntable assembly structure.

[0029] In the figure: 2, processing warehouse, 3, column, 4, feeding mechanism, 41, slide, 42, workbench, 43, turntable assembly, 431, first motor, 432, rotating shaft, 433, second motor, 434, rotating platform, 435, tool setting block, 5, tool magazine, 6, spindle box, 7, spindle, 8, protective mechanism, 81, slide rail, 82, protective cover, 83, gear bar, 84, drive assembly, 841, motor frame, 842, drive motor, 843, mounting seat, 844, screw, 845, box, 846, slider, 847, spring, 848, retaining ring, 85, control assembly, 851, limit block, 852, first limit switch, 853, second limit switch, 86, warehouse door, 9, operation panel, 10, handwheel. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] See also Figure 1-7The present invention provides an intelligent processing control device for a CNC machine tool, comprising: a processing chamber 2, a column 3, a feeding mechanism 4, a tool magazine 5, a spindle box 6, a spindle 7, a protective mechanism 8, an operation panel 9 and a handwheel 10. The column 3 is arranged at the rear side of the processing chamber 2, the tool magazine 5 is arranged on the left side of the processing chamber 2, the tool magazine 5 is an automatic tool magazine, and different tools can be replaced on the spindle 7. The spindle box 6 can be raised and lowered on the front side of the column 3, the spindle 7 can be rotatably installed on the bottom of the spindle box 6, the feeding mechanism 4 is arranged on the front side of the column 3, the protective mechanism 8 is arranged on the front side of the processing chamber 2, the operation panel 9 is arranged at the front right end of the processing chamber 2, and the tool magazine 5, the spindle box 6 , the feed mechanism 4 and the protection mechanism 8 are all electrically connected to the operation panel 9. The operation panel 9 is modularly composed of an internal CPU, instruction and data storage, input and output units, power modules, digital simulation and other units. Instructions for performing operations such as logical operations, sequential control, timing, counting and arithmetic operations are stored internally. Various types of mechanical equipment or production processes are controlled through digital or analog input and output. The handwheel 10 is installed at the bottom of the operation panel 9 through a wire and is electrically connected to the operation panel 9. The operator can drive the feed mechanism 4 to move through the handwheel 10. The handwheel 10 is provided with a dial to facilitate the operator to perform tool setting;

[0032] The feeding mechanism 4 includes: a slide 41, a workbench 42 and a turntable assembly 43. The slide 41 is arranged on the front side of the processing chamber 2 and is electrically connected to the operation panel 9. The workbench 42 is arranged at the output end of the slide 41. The turntable assembly 43 is fixedly installed on the top of the workbench 42 and is electrically connected to the operation panel 9.

[0033] As a preferred solution, further, Figure 7As shown, the turntable assembly 43 includes: a first motor 431, a rotating seat 432, a second motor 433, a rotating platform 434 and a tool setting block 435. The first motor 431 is fixedly mounted on the top of the workbench 42 and is electrically connected to the operation panel 9. The rotating seat 432 is rotatably mounted on the right side of the first motor 431 and is fixedly connected to the output end of the first motor 431. The second motor 433 is fixedly mounted on the right side of the rotating seat 432 and is electrically connected to the operation panel 9. The rotating platform 434 is rotatably mounted on the top of the second motor 433 and is fixedly connected to the output end of the second motor 431. The tool setting block 435 is fixedly mounted on the first At the rear end of the top right side of the motor 431, the operator controls the tool magazine 5 through the panel 9 in the slot to replace the bottom of the spindle 7 with the tool setter. The operator controls the spindle 7 to rotate at a low speed through the handwheel 10 and approaches the tool setting block 435 for tool setting, thereby recording the position of the tool setting block 435 in the machine tool coordinate system. In a specific implementation, if the size of the first motor 431 is 200*800*600, the tool setting block 435 is used as a reference, and the position occupied by the first motor 431 is within the range of 200*800*600. When the operator's programmed path coincides with the position occupied by the first motor 431, the control panel 9 will not run the program to avoid a collision.

[0034] As a preferred solution, further, Figure 2 As shown, the protective mechanism 8 includes: a slide rail 81, a protective cover 82, a stop bar 83, a drive assembly 84, a control assembly 85 and a warehouse door 86. The warehouse door 86 is opened on the front side of the processing warehouse 2, the slide rail 81 is arranged on the front side of the processing warehouse 2, the protective cover 82 is slidably installed on the front side of the slide rail 81, the stop bar 83 is fixedly installed on the front side of the processing warehouse 2, and the stop bar 83 is arranged on the right side of the warehouse door 86. The drive assembly 84 is arranged on the front top of the tool magazine 2 and is electrically connected to the operation panel 9. The control assembly 85 is arranged on the front side of the drive assembly 84 and is electrically connected to the operation panel 9.

[0035] As a preferred solution, further, Figure 2-4As shown, the driving assembly 84 includes: a motor frame 841, a driving motor 842, a mounting seat 843, a screw 844, a box 845, a slider 846, a spring 847 and a retaining ring 848. The motor frame 841 is arranged at the upper left corner of the front side of the tool magazine 5, the driving motor 842 is fixedly mounted on the left side of the motor frame 841, and is electrically connected to the operation panel 9, the mounting seat 843 is arranged at the upper right corner of the front side of the processing chamber 2, one end of the screw 844 is rotatably mounted on the right side of the motor frame 841, and the other end is rotatably mounted on the left side of the mounting seat 843, and the screw 844 is fixedly connected to the output end of the driving motor 842, the box 845 is fixedly mounted on the upper right corner of the front side of the protective cover 82, and the screw 844 is adapted to be plugged into the box 845, and the slider 84 6 is slidably installed on the side wall of the inner cavity of the box body 845, and the screw 844 is screwed to the slider 846. One end of the spring 847 is clamped to the right side of the slider 846, and the other end is clamped to the right side of the inner cavity of the box body 845. The retaining ring 848 is set on the right side of the inner cavity of the box body 845, and the retaining ring 848 is sleeved with the spring 847. The operation panel 9 controls the output end of the drive motor 842 to drive the screw 844 to rotate. Under the action of the thread lift between the screw 844 and the slider 846, the spring 847 pushes the box body 845 and the protective cover 82 to close to the right along the slide rail 81. When the protective cover 82 is blocked, the slider 846 continues to slide to the right, and the spring 846 is compressed and enters the inner cavity of the retaining ring 848 until the slider 846 contacts the retaining ring 848.

[0036] As a preferred solution, further, Figure 3-4 As shown, the control component 85 includes: a limit block 851, a first limit switch 852 and a second limit switch 853. The limit block 851 is arranged at the front right end of the box body 845. The first limit switch 852 is fixedly installed on the front side of the slider 846 and is electrically connected to the operation panel 9. The second limit switch 853 is fixedly installed on the front side of the mounting seat 843 and is electrically connected to the operation panel 9. When the protective cover 82 is opened, the first limit switch 852 and the second limit switch 853 do not detect the limit block 851. The operation panel 9 limits the rotation speed of the spindle 7, that is, the tool can only be set by low-speed rotation. When the protective cover 82 is completely closed, the first limit switch 852 and the second limit switch 853 simultaneously detect the limit block 851. The operation panel 9 unlocks the rotation speed of the spindle 7, thereby enabling high-speed cutting.

[0037] A control method for an intelligent machining control device of a CNC machine tool, comprising the following steps:

[0038] Step 1: During initial use, the turntable assembly 43 is fixed to the top of the workbench 42 with bolts. The operator controls the tool magazine 5 through the panel 9 in the slot to replace the bottom of the spindle 7 with the tool setter. The operator controls the spindle 7 to rotate at a low speed and approach the tool setting block 435 using the handwheel 10 for tool setting, thereby recording the position of the tool setting block 435 in the machine tool coordinate system.

[0039] Step 2: The operator fixes the part to be processed on the top of the rotating platform 434, and controls the tool setting device to set the part to be processed by the hand wheel 10, and updates the origin of the part coordinate system;

[0040] Step 3: When the protective cover 82 is opened, the first limit switch 852 and the second limit switch 853 do not detect the limit block 851, and the control panel 9 limits the rotation speed of the spindle 7, that is, the tool setting can only be performed by low-speed rotation;

[0041] Step 4: The control panel 9 controls the output end of the drive motor 842 to rotate the screw 844. Under the action of the thread lift between the screw 844 and the slider 846, the spring 847 pushes the box 845 and the protective cover 82 to close to the right along the slide rail 81. When the protective cover 82 is blocked, the slider 846 continues to slide to the right. During this process, the spring 846 is compressed and enters the inner cavity of the retaining ring 848. When the slider 846 contacts the retaining ring 848, the first limit block 852 touches the limit block 851. The first limit block 852 sends a signal to the control panel 9, and the control panel 9 controls the drive motor 848 to brake.

[0042] Step five, when the protective cover 82 moves to the rightmost end, the limit block 851 touches the second limit switch 853, and the second limit switch 853 sends an in-position signal to the operating panel 9. The drive motor 842 continues to drive the slider 846 to move to the right, and the spring 846 is compressed and enters the inner cavity of the retaining ring 848. When the slider 846 contacts the retaining ring 848, the first limit block 852 touches the limit block 851, and the first limit block 852 sends a signal to the operating panel 9. The operating panel 9 controls the drive motor 848 to brake, and the protective cover 82 is completely closed. The first limit switch 852 and the second limit switch 853 detect the limit block 851 at the same time, and the operating panel 9 unlocks the speed of the spindle 7, so that high-speed cutting can be performed.

[0043] The above are only preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention. These should also be regarded as the scope of protection of the present invention. These will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. An intelligent machining control device for a CNC machine tool, comprising: A processing chamber (2), a column (3), a tool magazine (5), a spindle box (6) and a spindle (7), wherein the column (3) is arranged at the rear side of the processing chamber (2), the tool magazine (5) is arranged on the left side of the processing chamber (2), the spindle box (6) is arranged to be liftable at the front side of the column (3), and the spindle (7) is rotatably mounted on the bottom of the spindle box (6), characterized in that it also includes: A feeding mechanism (4) is arranged on the front side of the column (3); A protective mechanism (8) is provided on the front side of the processing chamber (2); An operating panel (9) is arranged at the front right end of the processing chamber (2), and the tool magazine (5), the spindle box (6), the feeding mechanism (4) and the protection mechanism (8) are all electrically connected to the operating panel (9); A hand wheel (10) is mounted on the bottom of the control panel (9) via a wire and is electrically connected to the control panel (9); The feeding mechanism (4) comprises: A slide (41) is arranged at the front side of the processing chamber (2) and is electrically connected to the control panel (9); A workbench (42) is provided at the output end of the slide (41); A turntable assembly (43) is fixedly mounted on the top of the workbench (42) and is electrically connected to the control panel (9); The protection mechanism (8) comprises: A chamber door (86) is provided on the front side of the processing chamber (2); A slide rail (81) is provided on the front side of the processing chamber (2); A protective cover (82) slidably mounted on the front side of the slide rail (81); A stop bar (83) is fixedly mounted on the front side of the processing chamber (2), and the stop bar (83) is arranged on the right side of the chamber door (86); A drive assembly (84) is disposed on the front top of the tool magazine (5) and is electrically connected to the control panel (9); A control component (85) is arranged on the front side of the driving component (84) and is electrically connected to the control panel (9); The drive assembly (84) includes: A motor frame (841) is arranged at the upper left corner of the front side of the tool magazine (5); A driving motor (842) is fixedly mounted on the left side of the motor frame (841) and is electrically connected to the control panel (9); A mounting seat (843) is provided at the upper right corner of the front side of the processing chamber (2); A screw rod (844), one end of which is rotatably mounted on the right side of the motor frame (841), and the other end of which is rotatably mounted on the left side of the mounting seat (843), and the screw rod (844) is fixedly connected to the output end of the drive motor (842); The box body (845) is fixedly mounted on the upper right corner of the front side of the protective cover (82), and the screw rod (844) is adapted to be plugged into the box body (845); A slider (846) is slidably mounted on the inner cavity side wall of the box body (845), and the screw rod (844) is screwed to the slider (846); A spring (847), one end of which is clamped to the right side of the slider (846), and the other end of which is clamped to the right side of the inner cavity of the box (845); A retaining ring (848) is provided on the right side of the inner cavity of the box body (845), and the retaining ring (848) is sleeved with the spring (847); The control component (85) includes: A limit block (851) is provided at the front right end of the box body (845); A first limit switch (852) is fixedly mounted on the front side of the slider (846) and is electrically connected to the control panel (9); The second limit switch (853) is fixedly mounted on the front side of the mounting seat (843) and is electrically connected to the control panel (9).

2. The intelligent machining control device for CNC machine tools according to claim 1, characterized in that: The turntable assembly (43) comprises: A first motor (431) is fixedly mounted on the top of the workbench (42) and electrically connected to the control panel (9); A rotating seat (432) is rotatably mounted on the right side of the first motor (431) and fixedly connected to the output end of the first motor (431); A second motor (433) is fixedly mounted on the right side of the rotating seat (432) and is electrically connected to the control panel (9); a rotating platform (434) rotatably mounted on the top of the second motor (433) and fixedly connected to the output end of the second motor (431); The tool setting block (435) is fixedly mounted on the top right rear end of the first motor (431).

3. The control method of the intelligent machining control device for a CNC machine tool according to claim 2, characterized in that: The following steps are involved: Step 1: When using for the first time, the turntable assembly (43) is fixed to the top of the workbench (42) by bolts, and the operator controls the tool magazine (5) through the slot panel (9) to replace the bottom of the main shaft (7) with the tool setting device, and the operator controls the main shaft (7) to rotate at a low speed and approach the tool setting block (435) for tool setting through the hand wheel (10), thereby recording the position of the tool setting block (435) in the machine tool coordinate system; In step 2, the operator fixes the part to be processed on the top of the rotating platform (434), and the operator controls the tool setting device to set the part to be processed through the hand wheel (10) and updates the origin of the part coordinate system; Step 3: When the protective cover (82) is opened, the first limit switch (852) and the second limit switch (853) do not detect the limit block (851), and the control panel (9) limits the rotation speed of the main shaft (7), and the tool is set by rotating at a low speed; Step 4: The control panel (9) controls the output end of the drive motor (842) to drive the screw (844) to rotate. Under the action of the thread lift between the screw (844) and the slider (846), the box (845) and the protective cover (82) are pushed to the right along the slide rail (81) by the spring (847). When the protective cover (82) is blocked, the slider (846) continues to slide to the right. During this process, the spring (847) is compressed and enters the inner cavity of the retaining ring (848). When the slider (846) contacts the retaining ring (848), the first limit switch (852) touches the limit block (851). The first limit switch (852) sends a signal to the control panel (9), and the control panel (9) controls the drive motor (842) to brake. Step 5, when the protective cover (82) moves to the rightmost end, the limit block (851) touches the second limit switch (853), the second limit switch (853) sends a position signal to the control panel (9), the drive motor (842) continues to drive the slider (846) to move to the right, the spring (847) is compressed and enters the inner cavity of the retaining ring (848), when the slider (846) contacts the retaining ring (848), the first limit switch (852) touches the limit block (851), the first limit switch (852) sends a signal to the control panel (9), the control panel (9) controls the drive motor (842) to brake, the protective cover (82) is completely closed, the first limit switch (852) and the second limit switch (853) simultaneously detect the limit block (851), the control panel (9) unlocks the speed of the spindle (7), thereby enabling high-speed cutting.

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