An electric spindle structure for a CNC milling machine

Abstract

The present invention belongs to the technical field of CNC milling machines, and specifically is an electric spindle structure of a CNC milling machine, including a spindle body, wherein the spindle body includes a shell, a front bearing cover, a rear bearing cover and a rotor, one end of the rotor is provided with an assembly head for clamping a tool, and also includes an interception component for intercepting debris, the interception component including: an interception cover installed on the outside of the front bearing cover, the interception cover is in the shape of an upper and lower combination of a cylinder and an inverted cone, and a plurality of guide grooves are distributed in a ring array on the interception cover; a second bearing installed between the interception cover and the rotor, the interception cover is rotatably connected to the rotor through the second bearing; an arc plate fixedly installed at the lower end of the interception cover, the outer wall surface of the arc plate is C-shaped; by setting the arc plate, the long chips can be led back to the processing end to prevent them from splashing toward the operator, thereby ensuring work safety, and the problem of chips being entangled on the tool tip can be avoided, thereby ensuring the service life of the tool.

Description

Technical Field

[0001] The invention belongs to the field of numerical control milling machines, in particular to an electric spindle structure of a numerical control milling machine. Background Art

[0002] A CNC milling machine is a machine tool that controls the movement of each axis of the machine tool through pre-programmed digital instructions to achieve workpiece processing. It consists of a CNC device, a machine tool body and auxiliary devices. Among them, the electric spindle is one of the core components of the machine tool body segment. It is responsible for cutting and other processing actions of the tool. When performing cutting and other processing actions, chips will be generated, and some chips will fly towards the operator, affecting safety.

[0003] A patent application with publication number CN118808687B discloses a turning electric spindle, including a sleeve body, a stator part, a rotor part, and also includes: a protective cover installed on the rotor part; a drive ring installed on the protective cover; a direction-changing transmission assembly installed between the drive ring and the rotor part; the transmission assembly drives the protective cover to rotate inward relative to the rotor part, thereby effectively capturing and guiding the chips generated during the turning process, preventing the chips from flying everywhere, and ensuring the safety of the working environment.

[0004] The above solution uses a protective cover that rotates in the opposite direction to the rotor to guide the chips back to the vicinity of the processing end to solve the problem of chip flying. However, for some long chips, guiding them back to the processing end may cause them to wrap around the tool tip, resulting in scratches on the processing surface or tool chipping.

[0005] To this end, the present invention provides an electric spindle structure for a numerically controlled milling machine. Summary of the Invention

[0006] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0007] The technical solution adopted by the present invention to solve its technical problems is: the electric spindle structure of an CNC milling machine described in the present invention includes a spindle body, the spindle body includes a shell, a front bearing cover, a rear bearing cover and a rotor, two bearings 1 are respectively installed between the front bearing cover and the rear bearing cover and the rotor, one end of the rotor is provided with an assembly head for clamping a tool, and also includes an interception component for intercepting debris, the interception component includes: an interception cover installed on the outside of the front bearing cover, the interception cover is in the shape of an upper and lower combination of a cylinder and an inverted cone, and a number of guide grooves are distributed in a ring array on the interception cover; bearing 2 is installed between the interception cover and the rotor, the interception cover is rotatably connected to the rotor through the bearing 2; an arc plate fixedly installed at the lower end of the interception cover, the outer wall surface of the arc plate is C-shaped.

[0008] Preferably, the interception assembly also includes: an exhaust channel opened in the interception cover; a plurality of adsorption holes opened on the interception cover, the adsorption holes being connected to the exhaust channel; a slip ring installed on the upper surface of the interception cover, the slip ring being connected to the exhaust channel, the slip ring being rotatably connected to the interception cover, and the slip ring being fixedly installed on the shell.

[0009] Preferably, the diameter of the adsorption hole is smaller than the diameter of the exhaust channel, a plurality of protruding rods are slidably mounted on the intercepting cover, and the adsorption hole is located within the moving range of the protruding rods.

[0010] Preferably, the interception assembly also includes: a rotating rod for driving the convex rod to slide, the rotating rod is slidably connected to the convex rod, and the rotating rod is rotatably connected to the interception cover; a push rod for driving the rotating rod to rotate, the push rod is slidably connected to the interception cover; a ring rotatably installed on the push rod; a telescopic rod that drives the ring to move up and down, the ring is fixedly connected to the movable end of the telescopic rod; and a spring three installed between the push rod and the interception cover.

[0011] Preferably, the interception assembly also includes: a No. 1 gear fixedly mounted on the rotor; a No. 2 gear rotatably mounted on the front bearing cover, the No. 1 gear and the No. 2 gear being meshed and connected; and a No. 3 gear for driving the interception cover to rotate, the No. 3 gear being meshed and connected with the No. 2 gear.

[0012] Preferably, the intercepting cover contains two, and the two intercepting covers cover the front bearing cover inside after being combined, and the intercepting cover and the slip ring are slidably plugged in up and down, and a sliding groove is provided on the intercepting cover, and an annular plate is slidably installed in the sliding groove, and an insert plate for limiting the annular plate is provided on the intercepting cover, and the insert plate and the intercepting cover are slidably connected up and down, and a spring for resetting is installed between the insert plate and the intercepting cover.

[0013] Preferably, it also includes: a plurality of jacks opened on the third gear; an insertion rod slidably mounted on the inner wall of the intercepting cover, and the insertion rod is used to connect with the third gear through the insertion rod.

[0014] Preferably, it also includes: a No. 4 gear rotatably mounted on the intercepting cover, the No. 4 gear being threadedly connected to the insertion rod; a No. 5 gear for driving the No. 4 gear to rotate, the No. 5 gear being rotatably mounted on the intercepting cover; a connecting rod for driving the No. 5 gear to rotate, the connecting rod being rotatably mounted on the intercepting cover, a trapezoidal block being slidably mounted on the connecting rod, the trapezoidal block being located within the moving range of the connecting rod; and a second spring mounted between the trapezoidal block and the connecting rod.

[0015] Preferably, a concave plate is fixedly installed on the outside of the second bearing, and the intercepting cover is movably plugged into the second bearing through the concave plate.

[0016] The beneficial effects of the present invention are as follows:

[0017] 1. The electric spindle structure of a CNC milling machine described in the present invention, by providing an arc-shaped plate, can not only guide long strips of chips back to the processing end to prevent them from splashing towards the operator, thus ensuring work safety, but also avoid the problem of chips being entangled on the tool tip, thereby ensuring the service life of the tool.

[0018] 2. The electric spindle structure of a CNC milling machine described in the present invention switches the adsorption mode according to the state of the processing debris by setting adsorption holes and exhaust channels, thereby ensuring the debris cleaning effect while optimizing energy consumption control, maintaining the cleanliness of the production environment, and avoiding energy waste caused by continuous suction. In conjunction with the convex rod, it can be used to increase the friction of the interception cover, and block the adsorption hole to prevent impurities from entering the internal channel and dredge possible residual blockages, thereby realizing the combination of dynamic adjustment of the debris handling method and the self-cleaning function. The displacement of the convex rod can switch between two working modes: friction blocking large debris and negative pressure adsorption of small debris, which not only meets the cleaning needs of debris of different sizes, but also effectively reduces the frequency of system maintenance.

[0019] 3. The electric spindle structure of a CNC milling machine described in the present invention realizes the rapid disassembly and connection of the intercepting cover by setting structures such as an annular plate, which is convenient for rapid maintenance when the intercepting cover is used for a long time and the problem of the smooth surface of the intercepting cover reducing the ability to guide debris and the internal exhaust channel of the intercepting cover being blocked occurs. It is easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below with reference to the accompanying drawings.

[0021] Figure 1 is a perspective view of an embodiment of the present invention;

[0022] Figure 2 is a cross-sectional view of the interception cover of the present invention;

[0023] Figure 3 yes Figure 2 A partial enlarged view of the middle part;

[0024] Figure 4 is a cross-sectional view of the first gear, the third gear and the concave plate of the present invention;

[0025] Figure 5 It is a structural schematic diagram of the annular plate of the present invention;

[0026] Figure 6 This is a schematic structural diagram of the fifth gear of the present invention;

[0027] Figure 7 It is a structural schematic diagram of the trapezoidal block of the present invention;

[0028] In the figure: 1. Housing; 2. Front bearing cover; 3. Rear bearing cover; 4. Rotor; 6. Interceptor assembly; 61. Interceptor cover; 62. Guide groove; 63. Bearing 2; 64. Arc plate; 65. Adsorption hole; 66. Exhaust channel; 67. Slip ring; 68. Protruding rod; 69. Rotating rod; 610. Push rod; 611. Circular ring; 612. Telescopic rod; 613. Gear No. 1; 614. Gear No. 2; 615. Gear No. 3; 616. Spring No. 3; 7. Slide groove; 8. Ring plate; 9. Insert plate; 11. Insert hole; 12. Insert rod; 13. Gear No. 4; 14. Gear No. 5; 16. Connecting rod; 17. Trapezoidal block; 18. Spring No. 2; 19. Concave plate. DETAILED DESCRIPTION

[0029] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0030] like Figure 1-Figure 7 As shown, an electric spindle structure of a CNC milling machine described in an embodiment of the present invention includes a spindle body, wherein the spindle body includes a shell 1, a front bearing cover 2, a rear bearing cover 3 and a rotor 4, two bearings 1 are respectively installed between the front bearing cover 2 and the rear bearing cover 3 and the rotor 4, one end of the rotor 4 is provided with an assembly head for clamping a tool, and also includes an interception component 6 for intercepting debris, the interception component 6 includes: an interception cover 61 installed on the outside of the front bearing cover 2, the interception cover 61 is in the shape of an upper and lower combination of a cylinder and an inverted cone, and a number of guide grooves 62 are distributed in a ring array on the interception cover 61; a bearing 2 63 installed between the interception cover 61 and the rotor 4, the interception cover 61 is rotatably connected to the rotor 4 through the bearing 2 63; an arc plate 64 fixedly installed at the lower end of the interception cover 61, and the outer wall surface of the arc plate 64 is C-shaped.

[0031] Specifically, the prior art uses an intercepting cover 61 that rotates counterclockwise relative to the rotor 4 to guide the chips back to the vicinity of the processing end to prevent the chips from splashing. However, for some long chips, guiding them back to the processing end may cause them to wrap around the tool tip, resulting in scratches on the processed surface or tool edge breakage.

[0032] The electric spindle body adopts the existing electric spindle structure with built-in cooling and other structures. The electric spindle body also includes a stator. The stator is the stationary part of the motor, including the stator core and stator windings. When current is passed through, a rotating magnetic field is generated around the stator. The rotor 4 is the rotating part of the motor, usually made of conductive material. When the rotating magnetic field cuts the conductor of the rotor 4, an induced electromotive force and an induced current are generated in the rotor 4, which in turn generates torque to rotate the rotor 4. The rotation of the rotor 4 drives the tool on the assembly head to rotate synchronously, thereby realizing processing actions such as cutting the workpiece.

[0033] The surface of the intercepting cover 61 is rough. While processing, the intercepting cover 61 is controlled to rotate counterclockwise relative to the rotor 4. The rotation of the intercepting cover 61 drives the arc plate 64 to rotate synchronously. The debris generated during processing has the same rotation direction as the rotor 4. Therefore, when the debris splashes onto the surface of the intercepting cover 61, the debris is first decelerated by the friction of the intercepting cover 61, and then moves downward in the guide groove 62 of the intercepting cover 61 to the arc plate 64. Since the arc plate 64 rotates with the intercepting cover 61, centrifugal force is generated, causing the debris to move toward the processing end with the tool as the center. Restricted by the shape of the outer wall of the arc plate 64, the debris and the tool diffuse outward at a small angle, which can not only lead the long strips of chips back to the processing end to prevent them from splashing toward the operator, ensuring work safety, but also avoid the problem of chips being entangled on the tip of the tool, ensuring the service life of the tool.

[0034] like Figure 2-Figure 5 As shown, the interception assembly 6 also includes: an exhaust channel 66 opened in the interception cover 61; a number of adsorption holes 65 opened on the interception cover 61, and the adsorption holes 65 are connected to the exhaust channel 66; a slip ring 67 installed on the upper surface of the interception cover 61, and the slip ring 67 is connected to the exhaust channel 66, and the slip ring 67 is rotatably connected to the interception cover 61, and the slip ring 67 is fixedly installed on the shell 1.

[0035] Specifically, the slip ring 67 is connected to an existing suction device with built-in filtering (the startup of the device is connected to the CNC device of the machine tool, and when the rotation speed of the tool is adjusted to the point where the chips are granular, the device can be controlled to start). Depending on the processing requirements, when the tool rotation speed is low, the chips are larger. As the tool rotation speed increases, the size of the chips gradually decreases. When the chips are small enough to float in the air, the suction device is started to generate suction at the adsorption hole 65 to remove the granular chips, effectively reducing dust pollution in the working area and improving the working environment of the operator. The adsorption mode is switched by the chip status, which ensures the chip cleaning effect while optimizing energy consumption control, maintaining the cleanliness of the production environment and avoiding energy waste caused by continuous suction.

[0036] like Figure 3 and Figure 5 As shown, the diameter of the adsorption hole 65 is smaller than the diameter of the exhaust channel 66 , and a plurality of protruding rods 68 are slidably mounted on the intercepting cover 61 , and the adsorption hole 65 is located within the moving range of the protruding rods 68 .

[0037] Specifically, the number of adsorption holes 65 and protruding rods 68 can be adjusted according to actual production needs. When the size of the debris is large, part of the end of the protruding rod 68 passes through the adsorption hole 65 and is located in the guide groove 62. The end of the protruding rod 68 is made of a material with a large friction coefficient. At this time, the protruding rod 68 can be used to increase the friction of the interception cover 61. When the size of the debris is small, the protruding rod 68 is controlled to slide toward the inside of the interception cover 61. At this time, the adsorption hole 65 is unobstructed and the debris can be sucked out by the exhaust device. Since the aperture of the adsorption hole 65 is the smallest, if blockage occurs, it will appear at the hole mouth. After the processing is completed, the protruding rod 68 is controlled to move to block the adsorption hole 65 again, which can prevent impurities from entering the internal channel and use its mechanical action to clear possible residual blockages, thereby realizing the combination of dynamically adjusting the debris processing method and the self-cleaning function. This structure can switch between two working modes: friction blocking large debris and negative pressure adsorption of small debris through the displacement of the protruding rod 68, which not only meets the cleaning needs of debris of different sizes, but also effectively reduces the frequency of system maintenance.

[0038] like Figure 3-Figure 5 As shown, the interception assembly 6 also includes: a rotating rod 69 for driving the protruding rod 68 to slide, the rotating rod 69 is slidably connected to the protruding rod 68, and the rotating rod 69 is rotatably connected to the interception cover 61; a push rod 610 for driving the rotating rod 69 to rotate, the push rod 610 is slidably connected to the interception cover 61; a ring 611 rotatably installed on the push rod 610; a telescopic rod 612 that drives the ring 611 to move up and down, the ring 611 is fixedly connected to the movable end of the telescopic rod 612; and a spring three 616 installed between the push rod 610 and the interception cover 61.

[0039] Specifically, a swivel is rotatably provided at the bottom of the circular ring 611, and the swivel is movably connected to the push rod 610 up and down. The push rod 610 is rotatably connected to the circular ring 611 through the swivel, and the telescopic rod 612 adopts an electrically controlled structure (its start is connected to the CNC device of the machine tool). When the chip size is small, the electric telescopic rod 612 is controlled to start and extend downward, driving the circular ring 611 and the push rod 610 to move downward synchronously. The movement of the push rod 610 drives the rotating rod 69 to rotate, and the rotation of the rotating rod 69 drives the protruding rod 68 to move toward the inside of the intercepting cover 61, so that the adsorption hole 65 and the exhaust channel 66 can be opened. When the processing is completed, the telescopic rod 612 is controlled to be reset, that is, the push rod 610 and the protruding rod 68 can be reset.

[0040] like Figure 4As shown, the interception assembly 6 also includes: a number one gear 613 fixedly mounted on the rotor 4; a number two gear 614 rotatably mounted on the front bearing cover 2, the number one gear 613 and the number two gear 614 being meshed and connected; a number three gear 615 for driving the interception cover 61 to rotate, the number three gear 615 being meshed and connected with the number two gear 614.

[0041] Specifically, during processing, the rotor 4 rotates to drive the first gear 613 to rotate, which drives the third gear 615 to rotate in the opposite direction through the second gear 614, and the third gear 615 drives the intercepting cover 61 to rotate in the same direction.

[0042] like Figure 5-Figure 6 As shown, the interception cover 61 contains two, and the two interception covers 61 are combined to cover the front bearing cover 2 inside, and the interception cover 61 and the slip ring 67 are slidably plugged in up and down, and the interception cover 61 is provided with a slide groove 7, and an annular plate 8 is slidably installed in the slide groove 7, and the interception cover 61 is provided with an insert plate 9 for limiting the annular plate 8, and the insert plate 9 and the interception cover 61 are slidably connected up and down, and a spring 1 for resetting is installed between the insert plate 9 and the interception cover 61.

[0043] like Figure 2-Figure 6 As shown, it also includes: a plurality of jacks 11 opened on the third gear 615; an insertion rod 12 slidably mounted on the inner wall of the intercepting cover 61, and the insertion rod 12 is used to connect with the third gear 615 through the insertion rod 12.

[0044] like Figure 5-Figure 7 As shown, it also includes: a number four gear 13 rotatably mounted on the intercepting cover 61, the number four gear 13 being threadedly connected to the insertion rod 12; a number five gear 14 for driving the number four gear 13 to rotate, the number five gear 14 being rotatably mounted on the intercepting cover 61; a connecting rod 16 for driving the number five gear 14 to rotate, the connecting rod 16 being rotatably mounted on the intercepting cover 61, a trapezoidal block 17 being slidably mounted on the connecting rod 16, the trapezoidal block 17 being located within the moving range of the connecting rod 16; and a spring 18 installed between the trapezoidal block 17 and the connecting rod 16.

[0045] like Figure 4 As shown, a concave plate 19 is fixedly installed on the outside of the second bearing 63, and the intercepting cover 61 is movably plugged in between the second bearing 63 through the concave plate 19.

[0046] Specifically, during installation, the two intercepting covers 61 first slide upward to insert the slip ring 67 into the inside of the intercepting cover 61. While sliding upward, they can be connected to the bearing 2 63 by plugging with the concave plate 19. After the two intercepting covers 61 are aligned, the annular plate 8 is controlled to slide into the slide groove 7 of the other intercepting cover 61. Then, the inserting plate 9 is inserted into the annular plate 8 under the action of the elastic force of the spring 1, and the annular plate 8 is limited, thereby realizing the connection between the two intercepting covers 61 (a sealing gasket is provided between the two intercepting covers 61 to realize a sealed connection). During the movement of the annular plate 8, one end of the annular plate 8 can push the trapezoidal block 17 to rotate, and the trapezoidal block 17 pushes the connecting rod 16 and the fifth gear 14 to rotate. The rotation of the fifth gear 14 drives the fourth gear 13 to rotate. Since the fourth gear 13 is threadedly connected to the inserting rod 12, the inserting rod 12 slides relative to the intercepting cover 61 until the inserting rod 12 is inserted into the insertion hole 11, and the intercepting cover 6 can be realized through the inserting rod 12 and the insertion hole 11. When the gear 61 is removed from the gear 615, the first step is to slide the insert plate 9 upwards, and then the annular plate 8 is rotated back into the respective intercepting covers 61. During the movement of the annular plate 8, the other end of the annular plate 8 contacts the trapezoidal block 17, first pushing the trapezoidal block 17 to rotate, driving the fifth gear 14 and the fourth gear 13 to rotate, so that the insert rod 12 is removed from the insertion hole 11, and the intercepting cover 61 and the third gear 615 are separated. Then the annular plate 8 continues to move, contacts the inclined surface of the trapezoidal block 17, and pushes the trapezoidal block 17 to retract into the connecting rod 16 to facilitate the passage of the annular plate 8. Then, the intercepting cover 61 can be removed by sliding the intercepting cover 61 downwards. By providing structures such as the annular plate 8, the intercepting cover 61 can be quickly disassembled and connected, which is convenient for the intercepting cover 61 to be quickly maintained after long-term use when the intercepting cover 61 has a smooth surface and its ability to guide debris is reduced or the exhaust channel 66 inside the intercepting cover 61 is blocked.

[0047] Working principle:

[0048] When current is applied, a rotating magnetic field is generated around the stator. The rotor 4 is the rotating part of the motor and is usually made of conductive material. When the rotating magnetic field cuts the conductor of the rotor 4, an induced electromotive force and an induced current are generated in the rotor 4, which in turn generates torque to rotate the rotor 4. The rotation of the rotor 4 drives the large tool on the assembly head to rotate synchronously, thereby achieving processing actions such as cutting the workpiece.

[0049] During processing, the rotor 4 rotates to drive the No. 1 gear 613 to rotate, and the No. 3 gear 615 is driven to rotate in the opposite direction through the No. 2 gear 614, and the No. 3 gear 615 drives the interception cover 61 to rotate in the same direction and in the opposite direction. If the debris generated during processing is large-sized debris, when the debris splashes onto the surface of the interception cover 61, the debris is first decelerated by the friction of the interception cover 61, and then moves downward in the guide groove 62 of the interception cover 61 to the arc plate 64. Since the arc plate 64 rotates with the interception cover 61, centrifugal force is generated, causing the debris to move toward the processing end with the tool as the center. Restricted by the shape of the outer wall of the arc plate 64, the debris and the tool are diffused outward at a small angle. The debris is centered on the tool and moves toward the tool at a small angle. Outward diffusion can not only lead the long chips back to the processing end to prevent them from splashing towards the operator, ensuring work safety, but also avoid the problem of chips entangled in the tip of the tool, ensuring the service life of the tool; if the chips generated during processing are small-sized chips, the electric telescopic rod 612 is controlled to start and extend downward, driving the ring 611 and the push rod 610 to move downward synchronously, and the movement of the push rod 610 drives the rotating rod 69 to rotate, and the rotating rod 69 rotates to drive the protruding rod 68 to move toward the inside of the intercepting cover 61, so that the adsorption hole 65 and the exhaust channel 66 can be opened, and the suction device is started to generate suction at the adsorption hole 65 to draw away the granular chips, effectively reducing dust pollution in the working area and improving the working environment of the operator;

[0050] When the processing is completed, the telescopic rod 612 is controlled to reset, and the protruding rod 68 moves to block the adsorption hole 65 again, which can not only prevent impurities from entering the internal channel, but also use its mechanical action to clear any remaining blockages, thereby realizing the combination of dynamic adjustment of debris processing mode and self-cleaning function.

[0051] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. An electric spindle structure for a CNC milling machine, comprising a spindle body, wherein the spindle body comprises a housing (1), a front bearing cover (2), a rear bearing cover (3) and a rotor (4), two bearings are respectively installed between the front bearing cover (2) and the rear bearing cover (3) and the rotor (4), and an assembly head for clamping a tool is provided at one end of the rotor (4), characterized in that: It also includes an interception assembly (6) for intercepting debris, the interception assembly (6) comprising: An interception cover (61) is installed on the outside of the front bearing cover (2), the interception cover (61) is in the shape of a top-bottom combination of a cylinder and an inverted truncated cone, and a plurality of guide grooves (62) are distributed in an annular array on the interception cover (61); A second bearing (63) is installed between the intercepting cover (61) and the rotor (4), and the intercepting cover (61) is rotatably connected to the rotor (4) through the second bearing (63); an arc-shaped plate (64) fixedly mounted on the lower end of the intercepting cover (61), wherein the outer wall surface of the arc-shaped plate (64) is C-shaped; The interception component (6) further comprises: An exhaust passage (66) provided in the interception cover (61); a plurality of adsorption holes (65) formed on the interception cover (61), wherein the adsorption holes (65) are in communication with the exhaust passage (66); a slip ring (67) mounted on the upper surface of the intercepting cover (61), the slip ring (67) being in communication with the exhaust passage (66), the slip ring (67) being rotatably connected to the intercepting cover (61), and the slip ring (67) being fixedly mounted on the housing (1); The diameter of the adsorption hole (65) is smaller than the diameter of the exhaust channel (66); a plurality of protruding rods (68) are slidably mounted on the intercepting cover (61); and the adsorption hole (65) is located within the moving range of the protruding rods (68); The interception component (6) further comprises: a rotating rod (69) for driving the protruding rod (68) to slide, the rotating rod (69) being slidably connected to the protruding rod (68), and the rotating rod (69) being rotationally connected to the intercepting cover (61); a push rod (610) for driving the rotating rod (69) to rotate, the push rod (610) being slidably connected to the intercepting cover (61); Rotating a ring (611) mounted on the push rod (610); a telescopic rod (612) for driving the circular ring (611) to move up and down, wherein the circular ring (611) is fixedly connected to a movable end of the telescopic rod (612); A spring three (616) is installed between the push rod (610) and the intercepting cover (61).

2. The electric spindle structure of a CNC milling machine according to claim 1, characterized in that: The interception component (6) further comprises: A first gear (613) fixedly mounted on the rotor (4); The second gear (614) mounted on the front bearing cover (2) is rotated, and the first gear (613) and the second gear (614) are meshed and connected; A third gear (615) is used to drive the intercepting cover (61) to rotate, and the third gear (615) is meshedly connected with the second gear (614).

3. The electric spindle structure of a CNC milling machine according to claim 2, characterized in that: The interception cover (61) includes two, and the two interception covers (61) cover the front bearing cover (2) inside after being combined. The interception cover (61) and the slip ring (67) are slidably connected up and down. A slide groove (7) is provided on the interception cover (61), and an annular plate (8) is slidably installed in the slide groove (7). The interception cover (61) is provided with an insert plate (9) for limiting the annular plate (8). The insert plate (9) and the interception cover (61) are slidably connected up and down, and a spring for resetting is installed between the insert plate (9) and the interception cover (61).

4. The electric spindle structure of a CNC milling machine according to claim 3, characterized in that: Also includes: A plurality of sockets (11) provided on the third gear (615); An insertion rod (12) is slidably mounted on the inner wall of the intercepting cover (61), and the insertion rod (12) is used to connect with the third gear (615) via the insertion rod (12).

5. The electric spindle structure of a CNC milling machine according to claim 4, characterized in that: Also includes: Rotating the fourth gear (13) mounted on the intercepting cover (61), wherein the fourth gear (13) is threadedly connected to the insertion rod (12); a fifth gear (14) for driving the fourth gear (13) to rotate, wherein the fifth gear (14) is rotatably mounted on the intercepting cover (61); a connecting rod (16) for driving the fifth gear (14) to rotate, the connecting rod (16) being rotatably mounted on the intercepting cover (61), a trapezoidal block (17) being slidably mounted on the connecting rod (16), and the trapezoidal block (17) being located within the moving range of the connecting rod (16); A second spring (18) is installed between the trapezoidal block (17) and the connecting rod (16).

6. The electric spindle structure of a CNC milling machine according to claim 1, characterized in that: A concave plate (19) is fixedly mounted on the outside of the second bearing (63), and the intercepting cover (61) is movably plugged in between the second bearing (63) and the concave plate (19).

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