A machine tool

Abstract

The application relates to the field of processing 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, 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, the inner ring wall of the start-stop ring is provided with a start-stop cavity for embedding the outer ring of the elastic brake ring, and the piston ring is slidingly connected to the inner wall of the start-stop cavity; when the piston ring slides along the inner wall of the start-stop cavity towards the elastic brake ring, the surface of the piston ring and the inner wall of the start-stop cavity clamp the elastic brake ring on both sides to form a limit. In the application, the start-stop ring, the elastic brake ring and the piston ring are arranged, the start-stop assembly is not prone to deviation during operation, the main shaft is uniformly stressed during braking, is not prone to fluctuation, and the normal operation of the machine tool is ensured.

Description

TECHNICAL FIELD

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

[0002] The machine tool refers to a machine that uses various cutting or non-cutting methods to process metal or non-metal materials into a certain shape and size, or serves as a purpose for more precise processing.

[0003] The spindle of the prior art machine tool is installed on the spindle box, and the spindle is started and stopped by installing the rear brake device. However, the rear brake device is prone to deviation during operation, which causes uneven stress on the spindle during braking, thereby generating fluctuation and affecting the normal operation of the machine tool. SUMMARY

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

[0005] The machine tool provided by the present application adopts the following technical scheme:

[0006] A machine tool comprises a main body, a spindle, a rotor and a brake device. The spindle is rotationally 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 provided for the spindle. 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 peripheral surface of the spindle. The inner ring of the elastic brake ring is coaxially connected to the surface of the rotor. The inner wall of the start-stop cavity is provided with a start-stop cavity for the outer ring of the elastic brake ring. The piston ring is slidingly connected to the inner wall of the start-stop cavity. When the piston ring slides along the inner wall of the start-stop cavity towards the elastic brake ring, the surface of the piston ring and the inner wall of the start-stop cavity clamp the elastic brake ring on both sides to form a limit.

[0007] By adopting the above technical scheme, the spindle 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 spindle 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. The outer ring of the elastic brake ring is embedded in the start-stop cavity. When the brake action of the spindle is needed, the piston ring is driven to slide along the inner wall of the start-stop cavity towards the elastic brake ring. The elastic brake ring is deformed by the extrusion of the piston ring. The surface of the piston ring and the inner wall of the start-stop cavity clamp the elastic brake ring on both sides to form a limit, thereby realizing the directional start and stop of the spindle. The shell is installed on the main body, and the inner cavity of the shell covers the start-stop assembly. The start-stop assembly is not prone to deviation during operation, thereby ensuring that the spindle is uniformly stressed during braking and is not prone to fluctuation, thereby ensuring the normal operation of the machine tool.

[0008] Optionally, the end face of the stop-start ring convex shell is provided with an air inlet channel, the air inlet channel is communicated with the stop-start cavity, the air inlet channel is located at the side of the piston ring away from the elastic brake ring, when air enters the stop-start cavity through the air inlet channel, the air pressure in the stop-start cavity increases, the piston ring is driven to slide along the inner wall of the stop-start cavity towards the elastic brake ring.

[0009] By adopting the above technical scheme, when the main shaft needs to be braked, air is driven to enter the stop-start cavity through the air inlet channel, the air pressure in the stop-start cavity increases, the piston ring is driven to slide along the inner wall of the stop-start cavity towards the elastic brake ring, the elastic brake ring is extruded and deformed by the piston ring, the surface of the piston ring and the inner wall of the stop-start cavity clamp the elastic brake ring on both sides to form a limit, and directional sliding of the piston ring is realized.

[0010] Optionally, the stop-start assembly further comprises an elastic member, one end of the elastic force direction of the elastic member is connected to the inner wall of the stop-start cavity, one end of the elastic force direction of the elastic member is connected to the surface of the piston ring, the elastic member has a tendency to drive the piston ring to slide towards the air inlet channel by elastic force, and the surface of the stop-start ring in the inner cavity of the shell is provided with an air outlet hole, the air outlet hole is communicated with the air inlet channel.

[0011] By adopting the above technical scheme, when the main shaft needs to be driven to rotate, air supply is stopped, the elastic member drives the piston ring to slide towards the air inlet channel by elastic force, the pressing 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 stop-start cavity enters the inner cavity of the shell from the air outlet hole through the air inlet channel, and directional discharge of the air in the stop-start cavity is realized.

[0012] Optionally, the piston ring comprises a sealing portion, a sliding portion and a pressing portion, the sliding portion is slidingly connected to the inner wall of the stop-start cavity, one end of the sliding portion is connected to the surface of the sealing portion, and the other end of the sliding portion is connected to the surface of the pressing portion, the inner ring of the sealing portion surrounds the outer circumferential surface of the main shaft, and the outer ring of the sealing portion is tightly pressed against the inner ring wall of the stop-start ring to form a seal, when the sliding portion slides along the inner wall of the stop-start cavity towards the elastic brake ring, the surface of the pressing portion and the inner wall of the stop-start cavity clamp the elastic brake ring on both sides to form a limit.

[0013] By adopting the above technical scheme, the outer ring of the sealing portion is tightly pressed against the inner ring of the stop-start ring to form a seal, the air discharged from the air inlet channel stably drives the sliding portion to slide along the inner wall of the stop-start cavity, and the pressing portion and the inner wall of the stop-start cavity clamp the elastic brake ring on both sides to form a limit, and directional start-stop of the main shaft is realized.

[0014] Optionally, the end of the pressing portion towards the elastic brake ring is provided with a buffer surface, the buffer surface is in a circular arc convex shape, and the buffer surface can tightly press against the elastic brake ring and guide the deformation of the elastic brake ring.

[0015] By adopting the technical scheme, when the sliding part slides on the inner wall of the start-stop cavity, the buffer surface abuts against the elastic brake ring and guides the elastic brake ring to deform, reducing the abrasion between the elastic brake ring and the abutting part, thereby prolonging the service life of the machine tool.

[0016] Optionally, a plurality of deformation holes are arranged on the surface of the elastic brake ring at intervals, and the deformation holes penetrate through both sides of the elastic brake ring.

[0017] By adopting the technical scheme, a plurality of deformation holes are arranged on the surface of the elastic brake ring at intervals, and the deformation holes penetrate through both sides of the elastic brake ring. The deformation holes provide a deformation space for the elastic brake ring under pressure, so that the elastic brake ring is not easy to wear, thereby prolonging the service life of the elastic brake ring.

[0018] Optionally, a limiting groove one for embedding an end of the elastic part is arranged on the inner wall of the start-stop cavity.

[0019] By adopting the technical scheme, when one end of the elastic part in the elastic direction is embedded in the limiting groove one, the inner wall of the limiting groove one abuts against the end of the elastic part to form limiting, so that the elastic part is not easy to be separated from the limiting groove one, thereby improving the connection stability between the elastic part and the piston ring.

[0020] Optionally, the start-stop ring comprises a mounting section, a sliding section and an abutting 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 in the shell, the abutting section is coaxially connected to the end of the sliding section away from the mounting section, one end of the air inlet channel is located on the end face of the mounting section protruding out of the shell, the other end of the air inlet channel is located on the surface of the sliding section facing the abutting section, and the start-stop cavity is located between the abutting section and the sliding section.

[0021] By adopting the technical scheme, the start-stop ring comprises the mounting section, the sliding section and the abutting section. When the air inlet channel is blocked and needs to be cleaned, the mounting section, the sliding section and the abutting section only need to be disassembled for cleaning, thereby improving the cleaning efficiency of the machine tool.

[0022] Optionally, the sealing part is provided with a sealing ring groove one for embedding a sealing ring on the outer ring wall facing the sliding section.

[0023] By adopting the technical scheme, the sealing ring is embedded in the sealing ring groove one, and the inner ring of the sealing ring abuts against the inner wall of the sealing ring groove one to form sealing. The outer ring of the sealing ring abuts against the inner wall of the sliding section to form sealing, so that the air discharged from the air inlet channel is not easy to overflow from the abutting position between the surface of the sealing part and the surface of the sliding part, thereby ensuring the abutting force between the surface of the sealing part and the surface of the sliding part.

[0024] Optionally, the machining assembly includes a sliding table, a tool holder and a tool disc, the sliding table is slidingly connected to the surface of the main body, the sliding direction of the sliding table is parallel to the axis of the main shaft, the tool holder is slidingly connected to the surface of the sliding table, the sliding direction of the tool holder is perpendicular to the sliding direction of the sliding table, the tool disc is rotatably connected to the surface of the tool holder facing the main shaft, the rotation axis of the tool disc is parallel to the axis of the main shaft, the tool disc can hold a tool, when the main shaft holds a workpiece, the sliding table slides along the surface of the main body towards the main shaft, the tool on the tool disc is flush with the surface of the workpiece held by the main shaft, the tool holder slides along the surface of the sliding table towards the workpiece, and the tool on the tool disc abuts against the surface of the workpiece to be machined.

[0025] By adopting the above technical scheme, when the main shaft holds a workpiece to be machined, the sliding table is driven to slide along the surface of the main body towards the main shaft, the tool on the tool disc is flush with the surface of the workpiece to be machined held by the main shaft, the tool holder is driven to slide along the surface of the sliding table towards the workpiece, the tool on the tool disc abuts against the surface of the workpiece to be machined, the main shaft drives the workpiece to rotate, and the tool cuts the surface of the workpiece to be machined, thereby realizing accurate machining of the surface of the workpiece to be machined.

[0026] In summary, the present application has at least one of the following beneficial technical effects:

[0027] 1. The start-stop ring, elastic brake ring and piston ring are arranged, the start-stop assembly is not easy to deviate during operation, the main shaft is uniformly stressed during braking, and fluctuation is not easy to occur, thereby ensuring normal operation of the machine tool;

[0028] 2. The air inlet channel is arranged, the elastic brake ring is clamped between the surface of the piston ring and the inner wall of the start-stop cavity, and directional sliding of the piston ring is realized;

[0029] 3. The buffer surface is arranged, the buffer surface abuts against the elastic brake ring and guides deformation of the elastic brake ring, wear between the elastic brake ring and the abutting portion is reduced, and the service life of the machine tool is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a schematic diagram of the overall structure in the embodiment of the present application.

[0031] Figure 2 is a schematic diagram of the overall structure of the main shaft and the brake device in the embodiment of the present application.

[0032] Figure 3 is a partial cross-sectional view of the embodiment of the present application, mainly showing the air inlet channel.

[0033] Figure 4 is a partial cross-sectional view of the embodiment of the present application, mainly showing the elastic member.

[0034] Figure 5 is the overall structure schematic diagram of the elastic brake ring in the embodiment of the application.

[0035] Label explanation: 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, abutting section; 4214, start-stop cavity; 4215, air inlet channel; 4216, limiting groove one; 4217, air vent; 422, elastic member; 423, elastic brake ring; 4231, deformation hole; 424, piston ring; 4241, sealing part; 4242, sliding part; 4243, abutting part; 4244, sealing ring groove one; 4245, sealing ring groove two; 4246, buffer surface; 5, machining assembly; 51, sliding table; 52, tool holder; 53, tool disc. DETAILED DESCRIPTION

[0036] The following will be described in detail in combination with the accompanying drawings. Figures 1-5 The application will be further described in detail.

[0037] The embodiment of the application discloses a machine tool. Referring to Figure 1 and Figure 2 , a machine tool comprises a main body 1, a main shaft 2, a rotor 3, a machining assembly 5 and a brake device 4, the bottom of the main body 1 abuts against the ground to form support, the main shaft 2 is rotationally connected to the surface of the main body 1, the end of the main shaft 2 protruding from the main body 1 can clamp a workpiece and drive the workpiece to rotate, the axis of the main shaft 2 and the length direction of the main body 1 are parallel to each other, the rotor 3 is coaxially connected to the outer circumferential surface of the main shaft 2, the brake device 4 is installed on the main body 1, the brake device 4 can control the start and stop of the main shaft 2, ensures uniform stress of the main shaft 2 during braking, and is not prone to fluctuation, thereby ensuring normal operation of the machine tool, the machining assembly 5 is slidingly connected to the top surface of the main body 1, the sliding direction of the machining assembly 5 and the length direction of the main body 1 are parallel to each other, and the machining assembly 5 can accurately machine the machined surface of the workpiece clamped by the main shaft 2.

[0038] Referring to Figure 1The processing assembly 5 comprises a sliding table 51, a tool seat 52 and a tool disc 53. The sliding table 51 is slidingly connected to the surface of the main body 1 at the bottom, and the sliding direction of the sliding table 51 is parallel to the axis of the main shaft 2. The tool seat 52 is slidingly connected to the top of the sliding table 51, and the sliding direction of the tool seat 52 is parallel to the width direction of the main body 1. The tool disc 53 is rotationally connected to the surface of the tool seat 52 facing the main shaft 2, and the rotation axis of the tool disc 53 is parallel to the axis of the main shaft 2. The disc surface of the tool disc 53 can hold various tools. When the main shaft 2 holds the workpiece, the sliding table 51 slides along the top surface of the main body 1 towards the main shaft 2. The processing end of the tool on the tool disc 53 is flush with the surface to be processed of the workpiece held by the main shaft 2. The tool seat 52 slides along the top surface of the sliding table 51 towards the axis of the main shaft 2. The processing end of the tool on the tool disc 53 abuts against the processing end of the workpiece. The main shaft 2 holds the workpiece and rotates. The tool on the tool disc 53 performs cutting processing on the surface to be processed of the workpiece, thereby achieving accurate processing of the surface to be processed of the workpiece.

[0039] With reference to Figure 1 and Figure 2 The brake device 4 comprises a housing 41 and a start-stop assembly 42. The housing 41 is fixed on the main body 1 by bolts. The inner cavity of the housing 41 is provided for the main shaft 2 to pass through, and the rotor 3 is located in the inner cavity of the housing 41. The start-stop assembly 42 is installed between the housing 41 and the rotor 3, and can control the start and stop of the main shaft 2.

[0040] With reference to Figure 3 and Figure 4 The start-stop assembly 42 comprises a start-stop ring 421, an elastic member 422, an elastic brake ring 423 and a piston ring 424. 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 on the end surface of the rotor 3 by bolts. The elastic brake ring 423 is provided with a plurality of deformation holes 4231 spaced apart. The plurality of deformation holes 4231 are uniformly distributed around the axis of the elastic brake ring 423. The axis of the deformation hole 4231 is parallel to the axis of the elastic brake ring 423. The deformation hole 4231 penetrates the outer wall of the elastic brake piece 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 easy to be worn, thereby prolonging the service life of the elastic brake ring 423.

[0041] With reference to Figure 3 and Figure 4, the start-stop ring 421 includes a mounting section 4211, a sliding section 4212 and a pressing section 4213, and in the embodiment, the mounting section 4211, the sliding section 4212 and the pressing section 4213 are all circular rings. One end of the mounting section 4211 is fixed on the surface of the shell 41 by bolts, 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 on the end of the mounting section 4211 in the inner cavity of the shell 41 by bolts, and the pressing section 4213 is coaxially fixed on the end face of the sliding section 4212 away from the mounting section 4211. The end of the main shaft 2 is sequentially arranged in the inner ring of the mounting section 4211, the inner ring of the sliding section 4212, the inner ring of the pressing 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.

[0042] Referring to Figure 3 and Figure 4 , the pressing section 4213 and the sliding section 4212 are left with a start-stop cavity 4214 for embedding the outer ring of the elastic brake ring 423, and the end face of the mounting section 4211 protruding from the shell 41 is provided with an air inlet channel 4215, which sequentially passes through the mounting section 4211 and the sliding section 4212 and communicates with the start-stop cavity 4214. The material of the piston ring 424 can be rubber or silicone, and in the embodiment, the material of the piston ring 424 is rubber, which has a certain deformation capacity. The piston ring 424 includes a sealing portion 4241, a sliding portion 4242 and a pressing portion 4243, and in the embodiment, the sealing portion 4241, the sliding portion 4242 and the pressing portion 4243 are all circular rings. The outer ring of the sliding portion 4242 is slidingly connected to the inner wall of the start-stop cavity 4214, the sliding direction of the sliding portion 4242 is parallel to the axis of the main shaft 2, the sealing portion 4241 is integrally formed and fixed on the end face of the sliding portion 4242 facing the sliding section 4212, and the pressing portion 4243 is integrally formed and fixed on the end face of the sliding portion 4242 facing the elastic brake ring 423. The outer ring of the sealing portion 4241 is tightly pressed against the inner ring wall of the sliding section 4212 to form a seal, and the outer ring wall of the sealing portion 4241 is coaxially provided with a sealing ring groove one 4244 for embedding a sealing ring. The outer ring of the sealing ring is tightly pressed against the inner ring wall of the sliding section 4212 to form a seal, and the inner ring of the sealing ring is tightly pressed against the inner wall of the sealing ring groove one 4244 to form a seal, thereby increasing the sealing property between the outer ring wall of the sealing portion 4241 and the inner ring wall of the sliding section 4212.

[0043] Referring to Figure 3 , the outer ring wall of the sliding portion 4242 is coaxially provided with a sealing ring groove two 4245 for embedding a sealing ring. The outer ring of the sealing ring is tightly pressed against the inner wall of the start-stop cavity 4214 to form a seal, and the inner ring of the sealing ring is tightly pressed against the inner wall of the sealing ring groove two 4245 to form a seal, thereby increasing the sealing property between the outer ring wall of the sliding portion 4242 and the inner wall of the start-stop cavity 4214.

[0044] Referring to Figure 3 and Figure 5The abutting part 4243 is provided with a buffer surface 4246 at the end of the elastic brake pad, the buffer surface 4246 is in the form of a circular arc protrusion, the buffer surface 4246 can abut against the elastic brake ring 423 and guide the deformation of the elastic brake ring 423; when the air enters the start-stop cavity 4214 through the air inlet channel 4215, the outer circle of the sealing part 4241 abuts against the inner circle wall of the sliding section 4212 to form a seal, and the outer circle wall of the sliding part 4242 abuts against the inner wall of the start-stop cavity 4214 to form a seal, the air pressure of the start-stop cavity 4214 connected with the air inlet channel 4215 increases, the sliding part 4242 is driven to slide along the inner wall of the start-stop cavity 4214 towards the direction close to the elastic brake ring 423, the buffer surface 4246 extrudes 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 extruded and deformed by the buffer surface 4246, the surface of the abutting part 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, rigidly lock the main shaft 2, and the shell 41 covers the start-stop assembly 42, so that the start-stop assembly 42 is not easy to deviate during operation, the main shaft 2 is uniformly stressed during braking, and is not easy to produce fluctuation, thereby ensuring the normal operation of the machine tool.

[0045] With reference to Figure 3 and Figure 4 The elastic member 422 can be a compression spring or a tension spring, in the embodiment of the application, the elastic member 422 is a compression spring and has a certain deformation capacity, the inner wall of the start-stop cavity 4214 towards the sliding part 4242 is provided with a limiting groove one 4216 for embedding the end of the elastic member 422, the end of the elastic member 422 in the elastic force direction is connected to the surface of the sliding part 4242, when the end of the elastic member 422 in the elastic force direction is embedded in the limiting groove one 4216 and the other end of the elastic member 422 in the elastic force direction is connected to the surface of the sliding part 4242, the inner wall of the limiting groove one 4216 abuts 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 part 4242 to slide towards the direction close to the air inlet channel 4215, and the abutting effect of the abutting part 4243 and the elastic brake ring 423 disappears.

[0046] With reference to Figure 2 and Figure 3The outer wall of the sliding section 4212 is provided with an exhaust hole 4217, which is communicated with the inner cavity of the shell 41 and the air inlet channel 4215; when the air supply to the air inlet channel 4215 is stopped, the elastic member 422 drives the sliding part 4242 to slide towards the direction close to the air inlet channel 4215, the abutting part 4243 disappears the abutting effect of the elastic brake ring 423, and the main shaft 2 is opened; at the same time, the air in the start-stop cavity 4214 is driven to enter the inner cavity of the shell 41 from the exhaust hole 4217 through the air inlet channel 4215, so as to realize the pressure reduction in the start-stop cavity 4214; a plurality of air vent holes 411 are provided on the surface of the shell 41 in a spaced manner, and the plurality of air vent holes 411 are communicated with 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 vent holes 411, so that the inner cavity wall of the shell 41 is not easy to be cracked due to excessive pressure, thereby prolonging the service life of the machine tool.

[0047] The implementation principle of the machine tool according to the embodiment of the application is as follows: when the air enters the start-stop cavity 4214 through the air inlet channel 4215, the outer abutting part 4241 of the sealing part abuts against the inner wall of the sliding section 4212 to form a seal, and the outer wall of the sliding part 4242 abuts against the inner wall of the start-stop cavity 4214 to form a seal; the air pressure in the start-stop cavity 4214 communicated with the air inlet channel 4215 increases, which drives the sliding part 4242 to slide along the inner wall of the start-stop cavity 4214 towards the direction close to the elastic brake ring 423, the buffer surface 4246 extrudes 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 deformed by being extruded by the buffer surface 4246, the surface of the abutting part 4243 and the inner wall of the start-stop cavity 4214 clamp the elastic brake ring 423 on both sides to form a limit, so as to rigidly lock the main shaft 2, and the shell 41 covers the start-stop assembly 42, so that the start-stop assembly 42 is not easy to deviate during operation, the main shaft 2 is uniformly stressed during braking, and is not easy to produce fluctuation, thereby ensuring the normal operation of the machine tool.

[0048] The above are the preferred embodiments of the application, but do not limit the protection scope of the application, therefore: any equivalent changes made according to the structure, shape, principle of the application should be covered within the protection scope of the application.

Claims

1. A machine tool, characterized in that: The device includes a main body (1), a main shaft (2), a rotor (3), and a braking device (4). The main shaft (2) is rotatably connected to the surface of the main body (1), and the rotor (3) is coaxially connected to the main shaft (2). The braking device (4) includes a housing (41) and a start-stop assembly (42). The housing (41) is connected to the main body (1), and the inner cavity of the housing (41) is for the main shaft (2) to pass through. The start-stop assembly (42) includes 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 housing (41), and the inner ring of the start-stop ring (421) surrounds the main shaft (2). On the outer circumference, the inner ring of the elastic brake ring (423) is coaxially connected to the surface of the rotor (3). The inner wall of the start-stop ring (421) has a start-stop cavity (4214) for the outer ring of the elastic brake ring (423) to be embedded. 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. The end face of the start-stop ring (421) protruding from the housing (41) has an air inlet channel. (4215), the air intake passage (4215) communicates with the start-stop chamber (4214), the air intake passage (4215) is located on the side of the piston ring (424) away from the elastic brake ring (423), the piston ring (424) includes a sealing part (4241), a sliding part (4242) and a pressing part (4243), the sliding part (4242) is slidably connected to the inner wall of the start-stop chamber (4214), one end of the sliding part (4242) is connected to the surface of the sealing part (4241), the other end of the sliding part (4242) is connected to the surface of the pressing part (4243), the inner ring of the sealing part (4241) surrounds the main shaft (2 On the outer circumference, the outer ring of the sealing part (4241) abuts against the inner ring wall of the start-stop ring (421) to form a seal. When the sliding part (4242) slides along the inner wall of the start-stop cavity (4214) toward the elastic brake ring (423), the surface of the abutting part (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. The end of the abutting part (4243) facing the elastic brake pad is provided with a buffer surface (4246). The buffer surface (4246) is in the shape of a circular arc protrusion. The buffer surface (4246) can abut against the elastic brake ring (423) and guide the elastic brake ring (423) to deform.

2. The machine tool according to claim 1, characterized in that: When air enters the start-stop chamber (4214) through the air intake channel (4215), the air pressure in the start-stop chamber (4214) increases, causing the piston ring (424) to slide along the inner wall of the start-stop chamber (4214) toward the elastic brake ring (423).

3. A machine tool according to claim 2, characterized in that: The start-stop assembly (42) further includes an elastic element (422). One end of the elastic element (422) in the elastic direction is connected to the inner wall of the start-stop cavity (4214), and the other end of the elastic element (422) in the elastic direction is connected to the surface of the piston ring (424). The elastic element (422) has the tendency to drive the piston ring (424) to slide towards the air intake channel (4215). The start-stop ring (421) has an exhaust hole (4217) on the surface of the inner cavity of the housing (41), and the exhaust hole (4217) is connected to the air intake channel (4215).

4. A machine tool according to claim 1, characterized in that: The surface of the elastic brake ring (423) is provided with a plurality of deformation holes (4231) spaced apart, and the deformation holes (4231) penetrate through both sides of the elastic brake ring (423).

5. A machine tool according to claim 3, characterized in that: The inner wall of the start / stop cavity (4214) is provided with a limiting groove (4216) for the end of the elastic element (422) to be inserted.

6. A machine tool according to claim 1, characterized in that: The start-stop ring (421) includes an installation section (4211), a sliding section (4212), and a clamping section (4213). The end of the installation section (4211) is embedded in the inner cavity of the housing (41). The sliding section (4212) is coaxially connected to the end of the installation section (4211) located inside the housing (41). The clamping section (4213) is coaxially connected to the end of the sliding section (4212) away from the installation section (4211). One end of the air intake channel (4215) is located on the end face of the installation section (4211) protruding from the housing (41). The other end of the air intake channel (4215) is located on the surface of the sliding section (4212) facing the clamping section (4213). The start-stop cavity (4214) is located between the clamping section (4213) and the sliding section (4212).

7. A machine tool according to claim 6, characterized in that: The sealing part (4241) has a sealing ring groove (4244) on the outer ring wall facing the sliding section (4212) for the sealing ring to be embedded.

8. A machine tool according to claim 1, characterized in that: It also includes a machining assembly (5), which includes a slide (51), a tool holder (52), and a cutter head (53). 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 surface of the slide (51), and the sliding direction of the tool holder (52) is perpendicular to the sliding direction of the slide (51). The cutter head (53) is rotatably connected to the tool holder (52) facing the surface of the slide (51). The rotation axis of the cutter head (53) is parallel to the axis of the spindle (2) on the surface of the main spindle (2). The cutter head (53) can hold the cutting tool. When the spindle (2) holds the workpiece, the slide (51) slides along the surface of the main body (1) toward the spindle (2). The cutting tool on the cutter head (53) is flush with the workpiece. The tool holder (52) slides along the surface of the slide (51) toward the workpiece. The cutting tool on the cutter head (53) abuts against the surface of the workpiece to be processed.

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