Machine tool

Abstract

The invention relates to the field of machining equipment, in particular to a machine tool which comprises a main body, a main shaft, a rotor and a brake device, the main shaft is rotationally connected to the surface of the main body, the rotor is coaxially connected to the main shaft, the brake device comprises a shell and a start-stop assembly, the shell is connected to the main body, and the start-stop assembly comprises a start-stop ring, an elastic brake ring and a piston ring. The outer ring of the start-stop ring is connected to the inner wall of the shell, the inner ring of the elastic brake ring is coaxially connected to the surface of the rotor, a start-stop cavity allowing the outer ring of the elastic brake ring to be embedded is formed in the wall of the inner ring of the start-stop ring, and the piston ring is slidably connected to the inner wall of the start-stop cavity. The surface of the piston ring and the inner wall of the start-stop cavity clamp the two sides of the elastic brake ring to form limiting. Through the arrangement of the start-stop ring, the elastic brake ring and the piston ring, the start-stop assembly is not prone to deviation in the operation process, it is guaranteed that the main shaft is evenly stressed in the braking process, fluctuation is not prone to being generated, and therefore normal operation of the machine tool is guaranteed.

Description

Technical Field

[0001] The present application relates to the field of processing equipment, and in particular to a machine tool. Background Art

[0002] A machine tool is a machine that uses various cutting or non-cutting methods and appropriate tools to process metal or non-metal materials into a certain shape and size, or is used for more precise processing.

[0003] In the prior art, the spindle of a machine tool is installed on a spindle box, and the spindle is started and stopped by installing a rear brake device. However, the rear brake device is prone to displacement during operation, resulting in uneven force on the spindle during braking, thereby generating fluctuations and affecting the normal operation of the machine tool. Summary of the invention

[0004] In order to improve the problem of uneven force on the spindle during braking, the present application provides a machine tool.

[0005] The present application provides a machine tool, which adopts the following technical solution: A machine tool comprises a main body, a spindle, a rotor and a brake device, wherein the spindle is rotatably connected to the surface of the main body, the rotor is coaxially connected to the spindle, the brake device comprises a shell and a start-stop assembly, the shell is connected to the main body, the inner cavity of the shell is for the spindle to pass through, the start-stop assembly comprises a start-stop ring, an elastic brake ring and a piston ring, the outer ring of the start-stop ring is connected to the inner wall of the shell, the inner ring of the start-stop ring surrounds the outer circumference of the spindle, the inner ring of the elastic brake ring is coaxially connected to the surface of the rotor, the inner ring wall of the start-stop ring is provided with a start-stop cavity for the outer ring of the elastic brake ring to be embedded, and the piston ring is slidably connected to the inner wall of the start-stop cavity. When the piston ring slides along the inner wall of the start-stop cavity toward the direction close to the elastic brake ring, the piston ring surface and the inner wall of the start-stop cavity clamp the two sides of the elastic brake ring to form a limit.

[0006] By adopting the above technical scheme, the main shaft rotates on the surface of the main body, the rotor is coaxially installed on the main body, the shell is installed on the main body, the main shaft passes through the inner cavity of the shell, the inner ring of the elastic brake ring is coaxially connected to the surface of the rotor, and the outer ring of the elastic brake ring is embedded in the start-stop cavity. When the main shaft needs to be braked, the piston ring is driven to slide along the inner wall of the start-stop cavity toward the direction close to the elastic brake ring, and the elastic brake ring is squeezed and deformed by the piston ring. The piston ring surface and the inner wall of the start-stop cavity clamp the two sides of the elastic brake ring to form a limit, thereby realizing directional start and stop of the main shaft; the shell is installed on the main body, and the inner cavity of the shell covers the start-stop assembly, so that the start-stop assembly is not easy to deviate during operation, ensuring that the main shaft is evenly stressed during the braking process and is not prone to fluctuations, thereby ensuring the normal operation of the machine tool.

[0007] Optionally, an inlet air duct is provided on the end surface of the start-stop ring protruding from the shell, and the inlet air duct is connected to the start-stop chamber. The inlet air duct is located on the side of the piston ring away from the elastic brake ring. When air enters the start-stop chamber through the inlet air duct, the air pressure in the start-stop chamber increases, driving the piston ring to slide along the inner wall of the start-stop chamber toward the elastic brake ring.

[0008] By adopting the above technical solution, when the main shaft needs to be braked, the air is driven into the start-stop chamber through the intake air duct, the air pressure in the start-stop chamber increases, and the piston ring slides along the inner wall of the start-stop chamber toward the elastic brake ring due to the air pressure in the start-stop chamber. The elastic brake ring is squeezed and deformed by the piston ring, and the piston ring surface and the inner wall of the start-stop chamber clamp the two sides of the elastic brake ring to form a limit, thereby realizing the directional sliding of the piston ring.

[0009] Optionally, the start-stop assembly also includes an elastic member, one end of the elastic member in the elastic direction is connected to the inner wall of the start-stop chamber, and the other end of the elastic member in the elastic direction is connected to the surface of the piston ring. The elastic member has a tendency to drive the piston ring to slide toward the direction close to the intake air passage by elastic force. An exhaust hole is provided on the surface of the start-stop ring located in the inner cavity of the shell, and the exhaust hole is connected to the intake air passage.

[0010] By adopting the above technical solution, when it is necessary to drive the main shaft to rotate, the ventilation is stopped, and the elastic force of the elastic part drives the piston ring to slide in the direction close to the intake air channel, the clamping force of the piston ring on the elastic brake ring disappears, and the main shaft continues to rotate stably; at the same time, the air in the start-stop chamber enters the inner cavity of the shell from the exhaust hole through the intake air channel, thereby realizing the directional discharge of the air in the start-stop chamber.

[0011] Optionally, the piston ring includes a sealing part, a sliding part and a clamping part, the sliding part is slidably connected to the inner wall of the start-stop chamber, one end of the sliding part is connected to the surface of the sealing part, and the other end of the sliding part is connected to the surface of the clamping part, the inner ring of the sealing part surrounds the outer circumference of the main shaft, and the outer ring of the sealing part presses against the inner ring wall of the start-stop ring to form a seal, when the sliding part slides along the inner wall of the start-stop chamber toward the elastic brake ring, the surface of the clamping part and the inner wall of the start-stop chamber clamp the two sides of the elastic brake ring to form a limit.

[0012] By adopting the above technical solution, the outer ring of the sealing part presses against the inner ring of the start-stop ring to form a seal, ensuring that the air discharged from the intake air duct stably drives the sliding part to slide on the inner wall of the start-stop chamber, and the pressing part and the inner wall of the start-stop chamber clamp the two sides of the elastic brake pad to form a limit, thereby realizing directional start and stop of the main shaft.

[0013] Optionally, a buffer surface is provided at the end of the pressing portion facing the elastic brake pad, and the buffer surface is in the shape of a circular arc protrusion, and the buffer surface can press against the elastic brake ring and guide the elastic brake ring to deform.

[0014] By adopting the above technical solution, when the sliding part slides on the inner wall of the start-stop chamber, the buffer surface presses against the elastic brake ring and guides the elastic brake ring to deform, reducing the wear between the elastic brake ring and the pressing part, thereby extending the service life of the machine tool.

[0015] Optionally, a plurality of deformation holes are provided at intervals on the surface of the elastic brake ring, and the deformation holes penetrate through two sides of the elastic brake ring.

[0016] By adopting the above technical solution, a plurality of deformation holes are provided at intervals on the surface of the elastic brake ring. The deformation holes penetrate through both sides of the elastic brake ring. The deformation holes provide deformation space for the elastic brake ring to deform under pressure, making the elastic brake ring less prone to wear, thereby extending the service life of the elastic brake ring.

[0017] Optionally, a limiting groove for the end of the elastic member to be embedded is provided on the inner wall of the start-stop chamber.

[0018] By adopting the above technical solution, when one end of the elastic part in the elastic direction is embedded in the limiting groove 1, the inner wall of the limiting groove 1 abuts against the end of the elastic part to form a limit, making it difficult for the elastic part to separate from the limiting groove 1, thereby improving the connection stability between the elastic part and the piston ring.

[0019] Optionally, the start-stop ring includes a mounting section, a sliding section and a tightening section, the end of the mounting section is embedded in the inner cavity of the shell, the sliding section is coaxially connected to the end of the mounting section located inside the shell, the tightening section is coaxially connected to the end of the sliding section away from the mounting section, one end of the intake air duct is located on the end surface of the mounting section protruding from the shell, the other end of the intake air duct is located on the surface of the sliding section facing the tightening section, and the start-stop chamber is located between the tightening section and the sliding section.

[0020] By adopting the above technical solution, the start-stop ring includes an installation section, a sliding section and a pressing section. When the intake air duct is blocked and needs to be cleaned, it is only necessary to disassemble the installation section, the sliding section and the pressing section for cleaning, thereby improving the cleaning efficiency of the machine tool.

[0021] Optionally, the outer ring wall of the sealing portion facing the sliding section is provided with a sealing ring groove for the sealing ring to be embedded.

[0022] By adopting the above technical solution, the sealing ring is embedded in the sealing ring groove 1, and the inner ring of the sealing ring is pressed against the inner wall of the sealing ring groove 1 to form a seal. The outer ring of the sealing ring is pressed against the inner wall of the sliding section to form a seal, so that the air discharged from the intake air channel is not easy to overflow from the pressing point between the sealing part surface and the sliding part surface, thereby ensuring the pressing force between the sealing part surface and the sliding part surface.

[0023] Optionally, it also includes a processing component, which includes a slide, a tool holder and a tool disc, the slide being slidably connected to the surface of the main body, the sliding direction of the slide and the axis of the spindle being parallel to each other, the tool holder being slidably connected to the surface of the slide, the sliding direction of the tool holder and the sliding direction of the slide being perpendicular to each other, the tool disc being rotatably connected to the surface of the tool holder facing the spindle, the rotation axis of the tool disc and the axis of the spindle being parallel to each other, the tool disc can clamp the tool, and when the spindle clamps the workpiece, the slide slides along the surface of the main body toward the direction close to the spindle, the tool processing end of the tool disc is flush with the workpiece, the tool holder slides along the surface of the slide toward the direction close to the workpiece, and the tool on the tool disc abuts the surface of the workpiece to be processed.

[0024] By adopting the above technical solution, when the spindle clamps the workpiece to be processed, the slide is driven to slide along the main body surface toward the spindle, the tool processing end on the cutter disc is flush with the workpiece to be processed surface clamped on the spindle, the tool seat is driven to slide along the slide surface toward the workpiece, the tool on the cutter disc abuts the workpiece to be processed surface, the spindle drives the workpiece to rotate, and the tool cuts the workpiece to be processed surface, thereby achieving precise processing of the workpiece to be processed surface.

[0025] In summary, the present application includes at least one of the following beneficial technical effects: 1. The setting of the start-stop ring, elastic brake ring and piston ring makes it difficult for the start-stop assembly to deviate during operation, ensuring that the spindle is evenly stressed during braking and not prone to fluctuations, thereby ensuring the normal operation of the machine tool; 2. The setting of the intake flow channel, the piston ring surface and the inner wall of the start-stop chamber clamp the two sides of the elastic brake ring to form a limit, so as to achieve directional sliding of the piston ring; 3. The buffer surface is set, the buffer surface presses against the elastic brake ring and guides the elastic brake ring to deform, reducing the wear between the elastic brake ring and the pressing part, thereby extending the service life of the machine tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure in the embodiment of the present application.

[0027] Figure 2 It is a schematic diagram of the overall structure of the main shaft and the brake device in the embodiment of the present application.

[0028] Figure 3 It is a partial cross-sectional view in an embodiment of the present application, mainly showing the intake air duct.

[0029] Figure 4 It is a partial cross-sectional map in the embodiment of the present application, mainly showing the elastic part.

[0030] Figure 5 It is a schematic diagram of the overall structure of the elastic brake ring in the embodiment of the present application.

[0031] Explanation of the reference numerals in the accompanying drawings: 1. main body; 2. main shaft; 3. rotor; 4. brake device; 41. shell; 411. air vent; 42. start-stop assembly; 421. start-stop ring; 4211. mounting section; 4212. sliding section; 4213. pressing section; 4214. start-stop chamber; 4215. inlet flow channel; 4216. limit groove 1; 4217. exhaust hole; 422. elastic member; 423. elastic brake ring; 4231. deformation hole; 424. piston ring; 4241. sealing part; 4242. sliding part; 4243. pressing part; 4244. sealing ring groove 1; 4245. sealing ring groove 2; 4246. buffer surface; 5. machining assembly; 51. slide; 52. tool holder; 53. tool disc. DETAILED DESCRIPTION

[0032] The following is combined with Figure 1-5 This application is described in further detail.

[0033] The present application embodiment discloses a machine tool. Figure 1 and Figure 2 A machine tool includes a main body 1, a spindle 2, a rotor 3, a processing assembly 5 and a brake device 4. The bottom of the main body 1 abuts the ground to form a support, the spindle 2 is rotatably connected to the surface of the main body 1, the end of the spindle 2 protruding from the main body 1 can clamp the workpiece and drive the workpiece to rotate, the axis of the spindle 2 and the length direction of the main body 1 are parallel to each other, the rotor 3 is coaxially connected to the outer circumference of the spindle 2, and the brake device 4 is installed on the main body 1. The brake device 4 can control the start and stop of the spindle 2 to ensure that the spindle 2 is evenly stressed during the braking process and is not prone to fluctuations, thereby ensuring the normal operation of the machine tool, the processing assembly 5 is slidably connected to the top surface of the main body 1, the sliding direction of the processing assembly 5 and the length direction of the main body 1 are parallel to each other, and the processing assembly 5 can accurately process the processing surface of the workpiece clamped by the spindle 2.

[0034] Reference Figure 1 The processing assembly 5 includes a slide 51, a tool holder 52 and a cutter disc 53. The bottom of the slide 51 is slidably connected to the surface of the main body 1, and the sliding direction of the slide 51 is parallel to the axis of the spindle 2. The tool holder 52 is slidably connected to the top of the slide 51, and the sliding direction of the tool holder 52 is parallel to the width direction of the main body 1. The cutter disc 53 is rotatably connected to the surface of the tool holder 52 facing the spindle 2, and the rotation axis of the cutter disc 53 is parallel to the axis of the spindle 2. The disc surface of the cutter disc 53 can clamp various tools; when the spindle 2 clamps the workpiece, the slide 51 slides along the top surface of the main body 1 toward the direction close to the spindle 2, and the processing end of the tool on the cutter disc 53 is flush with the workpiece to be processed surface clamped by the spindle 2, and the tool holder 52 slides along the top surface of the slide 51 toward the direction close to the axis of the spindle 2, and the tool processing end on the cutter disc 53 abuts against the workpiece processing end. The spindle 2 clamps the workpiece and rotates, and the tool on the cutter disc 53 cuts the workpiece to be processed, thereby realizing precise processing of the workpiece to be processed.

[0035] Reference Figure 1 and Figure 2 The brake device 4 includes a shell 41 and a start-stop assembly 42. The shell 41 is fixed to the main body 1 by bolts. The inner cavity of the shell 41 is for the main shaft 2 to pass through, and the rotor 3 is located in the inner cavity of the shell 41. The start-stop assembly 42 is installed between the shell 41 and the rotor 3. The start-stop assembly 42 can control the start and stop of the main shaft 2.

[0036] Reference Figure 3 and Figure 4 The start-stop assembly 42 includes a start-stop ring 421, an elastic member 422, an elastic brake ring 423 and a piston ring 424. In the embodiment of the present application, the material of the elastic brake ring 423 is 65 manganese, which has a certain deformation ability. The elastic brake ring 423 is coaxially fixed to the end face of the rotor 3 by bolts. The elastic brake ring 423 is spaced apart with a plurality of deformation holes 4231. The plurality of deformation holes 4231 are evenly distributed around the axis of the elastic brake ring 423. The axis of the deformation hole 4231 and the axis of the elastic brake ring 423 are parallel to each other. The deformation hole 4231 passes through the outer wall of the elastic brake pad along its own axis. The deformation hole 4231 provides a deformation space for the elastic brake ring 423, so that the elastic brake ring 423 is not easily worn, thereby extending the service life of the elastic brake ring 423.

[0037] Reference Figure 3 and Figure 4 The start-stop ring 421 includes a mounting section 4211, a sliding section 4212 and a tightening section 4213. In the embodiment of the present application, the mounting section 4211, the sliding section 4212 and the tightening section 4213 are all circular rings. One end of the mounting section 4211 is fixed to the surface of the shell 41 by bolts, and the other end of the mounting section 4211 is embedded in the inner cavity of the shell 41. The sliding section 4212 is coaxially fixed to the end of the mounting section 4211 located in the inner cavity of the shell 41 by bolts, and the tightening section 4213 is coaxially fixed to the end face of the sliding section 4212 away from the mounting section 4211. The end of the main shaft 2 is successively penetrated by the inner ring of the mounting section 4211, the inner ring of the sliding section 4212, the inner ring of the tightening section 4213 and the inner cavity of the shell 41 and protrudes from the surface of the main body 1, and the end of the main shaft 2 protruding from the surface of the main body 1 can clamp and fix the workpiece.

[0038] Reference Figure 3 and Figure 4A start-stop chamber 4214 is reserved between the pressing section 4213 and the sliding section 4212 for the outer ring of the elastic brake ring 423 to be embedded. An inlet air channel 4215 is provided on the end surface of the mounting section 4211 protruding from the shell 41. The inlet air channel 4215 passes through the mounting section 4211 and the sliding section 4212 in sequence and is connected to the start-stop chamber 4214. The material of the piston ring 424 can be rubber or silicone. In the embodiment of the present application, the material of the piston ring 424 is rubber, which has a certain deformation ability. The piston ring 424 includes a sealing portion 4241, a sliding portion 4242 and a pressing portion 4243. In the embodiment of the present application, the sealing portion 4241, the sliding portion 4242 and the pressing portion 4243 are all circular rings, and the outer ring of the sliding portion 4242 is slidably connected On the inner wall of the start-stop chamber 4214, the sliding direction of the sliding part 4242 and the axis of the main shaft 2 are parallel to each other, the sealing part 4241 is integrally formed and fixed on the end face of the sliding part 4242 facing the sliding section 4212, and the pressing part 4243 is integrally formed and fixed on the end face of the sliding part 4242 facing the elastic brake ring 423, the outer ring of the sealing part 4241 presses against the inner ring wall of the sliding section 4212 to form a seal, and the outer ring wall of the sealing part 4241 is coaxially provided with a sealing ring groove 4244 for the sealing ring to be embedded, the outer ring of the sealing ring presses against the inner ring wall of the sliding section 4212 to form a seal, and the inner ring of the sealing ring presses against the inner wall of the sealing ring groove 4244 to form a seal, thereby increasing the sealing between the outer ring wall of the sealing part 4241 and the inner ring wall of the sliding section 4212.

[0039] Reference Figure 3 The outer ring wall of the sliding part 4242 is coaxially provided with a sealing ring groove 4245 for the sealing ring to be embedded. The outer ring of the sealing ring is pressed against the inner wall of the start-stop chamber 4214 to form a seal, and the inner ring of the sealing ring is pressed against the inner wall of the sealing ring groove 4245 to form a seal, thereby increasing the sealing between the outer ring wall of the sliding part 4242 and the inner wall of the start-stop chamber 4214.

[0040] Reference Figure 3 and Figure 5, a buffer surface 4246 is provided at the end of the pressing portion 4243 facing the elastic brake pad, and the buffer surface 4246 is in the shape of a circular arc protrusion, and the buffer surface 4246 can press against the elastic brake ring 423 and guide the elastic brake ring 423 to deform; when air enters the start-stop chamber 4214 through the intake air channel 4215, the outer ring of the sealing portion 4241 presses against the inner ring wall of the sliding section 4212 to form a seal, and the outer ring wall of the sliding portion 4242 presses against the inner wall of the start-stop chamber 4214 to form a seal, and the air pressure in the start-stop chamber 4214 connected to the intake air channel 4215 increases, driving the sliding portion 4242 to press against the inner wall of the start-stop chamber 4214 The elastic brake ring 423 slides in the direction close to the elastic brake ring 423, and the buffer surface 4246 squeezes the surface of the elastic brake ring 423. The deformation hole 4231 provides a deformation space for the elastic brake ring 423. The elastic brake ring 423 is squeezed and deformed by the buffer surface 4246. The surface of the tightening portion 4243 and the inner wall of the start-stop cavity 4214 clamp the two sides of the elastic brake ring 423 to form a limit, thereby realizing the rigid locking of the main shaft 2. The shell 41 covers the start-stop component 42, so that the start-stop component 42 is not easy to deviate during operation, ensuring that the main shaft 2 is evenly stressed during the braking process and is not prone to fluctuations, thereby ensuring the normal operation of the machine tool.

[0041] Reference Figure 3 and Figure 4 The elastic member 422 can be a compression spring or a tension spring. In the embodiment of the present application, the elastic member 422 is a compression spring with a certain deformation ability. The start-stop chamber 4214 is provided with a limiting groove 4216 for the end of the elastic member 422 to be embedded in the inner wall facing the sliding portion 4242. The end of the elastic member 422 in the elastic direction away from the limiting groove 4216 is connected to the surface of the sliding portion 4242. When one end of the elastic member 422 in the elastic direction is embedded in the limiting groove 4216 and the other end of the elastic member 422 in the elastic direction is connected to the surface of the sliding portion 4242, the inner wall of the limiting groove 4216 presses against the end of the elastic member 422 to form a limit, and the elastic member 422 has an elastic force to drive the sliding portion 4242 to slide in the direction close to the intake air duct 4215, and the pressing effect of the pressing portion 4243 and the elastic brake ring 423 tends to disappear.

[0042] Reference Figure 2 and Figure 3, an exhaust hole 4217 is provided on the outer ring wall of the sliding section 4212, and the exhaust hole 4217 is connected to the inner cavity of the shell 41 and the inlet air channel 4215; when the air supply to the inlet air channel 4215 is stopped, the elastic force of the elastic member 422 drives the sliding portion 4242 to slide in the direction close to the inlet air channel 4215, the tightening effect of the tightening portion 4243 and the elastic brake ring 423 disappears, and the main shaft 2 rotates and starts; at the same time, the air in the start-stop chamber 4214 is driven to enter the inner cavity of the shell 41 from the exhaust hole 4217 through the inlet air channel 4215, thereby reducing the pressure in the start-stop chamber 4214; a plurality of air leakage holes 411 are spaced apart on the surface of the shell 41, and the plurality of air leakage holes 411 are connected to the inner cavity of the shell 41. When the air pressure in the shell 41 increases, the air in the shell 41 can be discharged through the air leakage holes 411, so that the inner cavity wall of the shell 41 is not easy to crack due to excessive pressure increase, thereby extending the service life of the machine tool.

[0043] The implementation principle of a machine tool in the embodiment of the present application is as follows: when air enters the start-stop chamber 4214 through the inlet airflow channel 4215, the outer ring of the sealing portion 4241 presses against the inner ring wall of the sliding section 4212 to form a seal, and the outer ring wall of the sliding portion 4242 presses against the inner wall of the start-stop chamber 4214 to form a seal, and the air pressure in the start-stop chamber 4214 connected to the inlet airflow channel 4215 increases, driving the sliding portion 4242 to slide along the inner wall of the start-stop chamber 4214 toward the elastic brake ring 423, and the buffer surface 4246 squeezes the elastic brake ring 423 surface, the deformation hole 4231 provides deformation space for the elastic brake ring 423, the elastic brake ring 423 is squeezed and deformed by the buffer surface 4246, the surface of the tightening portion 4243 and the inner wall of the start-stop cavity 4214 clamp the two sides of the elastic brake ring 423 to form a limit, thereby realizing the rigid locking of the main shaft 2, and the shell 41 covers the start-stop component 42, so that the start-stop component 42 is not easy to deviate during operation, ensuring that the main shaft 2 is evenly stressed during the braking process and not prone to fluctuations, thereby ensuring the normal operation of the machine tool.

[0044] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A machine tool, characterized in that: The invention comprises a main body (1), a main shaft (2), a rotor (3) and a brake device (4), wherein the main shaft (2) is rotatably connected to the surface of the main body (1), the rotor (3) is coaxially connected to the main shaft (2), the brake device (4) comprises a shell (41) and a start-stop assembly (42), the shell (41) is connected to the main body (1), the inner cavity of the shell (41) is for the main shaft (2) to pass through, the start-stop assembly (42) comprises a start-stop ring (421), an elastic brake ring (423) and a piston ring (424), the outer ring of the start-stop ring (421) is connected to the inner wall of the shell (41), and the start-stop assembly (424 ... start-stop ring (421) is connected to the inner wall of the shell (41), and the start-stop assembly (424) comprises a start-stop ring (421), an elastic brake ring (423) and a piston ring (424), the start-stop ring (421) is connected to the inner wall of the shell (41), and the start-stop assembly (424) comprises a start-stop ring (421), an elastic brake ring (423) and a piston ring (424), the start-stop ring (421) is connected to the inner wall of the shell The inner ring of the ring (421) surrounds the outer circumference of the main shaft (2), the inner ring of the elastic brake ring (423) is coaxially connected to the surface of the rotor (3), the inner ring wall of the start-stop ring (421) is provided with a start-stop cavity (4214) for the outer ring of the elastic brake ring (423) to be embedded, and the piston ring (424) is slidably connected to the inner wall of the start-stop cavity (4214). When the piston ring (424) slides along the inner wall of the start-stop cavity (4214) toward the elastic brake ring (423), the surface of the piston ring (424) and the inner wall of the start-stop cavity (4214) clamp the two sides of the elastic brake ring (423) to form a limit.

2. A machine tool according to claim 1, characterized in that: An inlet flow channel (4215) is provided on the end surface of the start-stop ring (421) protruding from the shell (41). The inlet flow channel (4215) is connected to the start-stop chamber (4214). The inlet flow channel (4215) is located on the side of the piston ring (424) away from the elastic brake ring (423). When air enters the start-stop chamber (4214) through the inlet flow channel (4215), the air pressure in the start-stop chamber (4214) increases, driving the piston ring (424) to slide along the inner wall of the start-stop chamber (4214) towards the elastic brake ring (423).

3. A machine tool according to claim 2, characterized in that: The start-stop assembly (42) further comprises an elastic member (422), one end of the elastic member (422) in the elastic direction is connected to the inner wall of the start-stop chamber (4214), and one end of the elastic member (422) in the elastic direction is connected to the surface of the piston ring (424), and the elastic member (422) has a tendency to drive the piston ring (424) to slide in a direction close to the intake air passage (4215) by elastic force, and an exhaust hole (4217) is provided on the surface of the start-stop ring (421) located in the inner cavity of the shell (41), and the exhaust hole (4217) is connected to the intake air passage (4215).

4. A machine tool according to claim 2, characterized in that: The piston ring (424) includes a sealing portion (4241), a sliding portion (4242) and a pressing portion (4243), wherein the sliding portion (4242) is slidably connected to the inner wall of the start-stop chamber (4214), one end of the sliding portion (4242) is connected to the surface of the sealing portion (4241), and the other end of the sliding portion (4242) is connected to the surface of the pressing portion (4243), the inner ring of the sealing portion (4241) surrounds the outer circumference of the main shaft (2), and the outer ring of the sealing portion (4241) presses against the inner ring wall of the start-stop ring (421) to form a seal, and when the sliding portion (4242) slides along the inner wall of the start-stop chamber (4214) toward the elastic brake ring (423), the surface of the pressing portion (4243) and the inner wall of the start-stop chamber (4214) clamp the two sides of the elastic brake ring (423) to form a limit.

5. A machine tool according to claim 4, characterized in that: The end of the pressing portion (4243) facing the elastic brake pad is provided with a buffer surface (4246), and the buffer surface (4246) is in the shape of a circular arc protrusion. The buffer surface (4246) can press against the elastic brake ring (423) and guide the elastic brake ring (423) to deform.

6. A machine tool according to claim 1, characterized in that: A plurality of deformation holes (4231) are provided at intervals on the surface of the elastic brake ring (423), and the deformation holes (4231) penetrate through both sides of the elastic brake ring (423).

7. A machine tool according to claim 3, characterized in that: The inner wall of the start-stop chamber (4214) is provided with a limiting groove (4216) for the end of the elastic member (422) to be embedded.

8. A machine tool according to claim 4, characterized in that: The start-stop ring (421) comprises a mounting section (4211), a sliding section (4212) and a pressing section (4213); the end of the mounting section (4211) is embedded in the inner cavity of the shell (41); the sliding section (4212) is coaxially connected to the end of the mounting section (4211) located inside the shell (41); the pressing section (4213) is coaxially connected to the end of the sliding section (4212) away from the mounting section (4211); one end of the inlet air duct (4215) is located on the end surface of the mounting section (4211) protruding from the shell (41); the other end of the inlet air duct (4215) is located on the surface of the sliding section (4212) facing the pressing section (4213); and the start-stop cavity (4214) is located between the pressing section (4213) and the sliding section (4212).

9. A machine tool according to claim 8, characterized in that: The outer ring wall of the sealing portion (4241) facing the sliding section (4212) is provided with a sealing ring groove (4244) for the sealing ring to be embedded.

10. A machine tool according to claim 1, characterized in that: The processing assembly (5) further comprises a slide (51), a tool seat (52) and a tool disc (53), wherein the slide (51) is slidably connected to the surface of the main body (1), the sliding direction of the slide (51) and the axis of the main shaft (2) are parallel to each other, the tool seat (52) is slidably connected to the surface of the slide (51), the sliding direction of the tool seat (52) and the sliding direction of the slide (51) are perpendicular to each other, and the tool disc (53) is rotatably connected to the tool seat (52) to move toward The tool disc (53) is disposed on the surface of the main shaft (2), the rotation axis of the tool disc (53) and the axis of the main shaft (2) are parallel to each other, the tool disc (53) can clamp a tool, and when the main shaft (2) clamps a workpiece, the slide (51) slides along the surface of the main body (1) in a direction close to the main shaft (2), the tool processing end on the tool disc (53) is flush with the workpiece, the tool seat (52) slides along the surface of the slide (51) in a direction close to the workpiece, and the tool on the tool disc (53) abuts against the surface of the workpiece to be processed.

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