Protection type milling cutter mounting assembly capable of automatically shrinking in case of overheating

Abstract

The invention provides an overheat self-shrinking protection type milling cutter mounting assembly, and relates to the technical field of milling cutter mounting assemblys.The overheat self-shrinking protection type milling cutter mounting assembly comprises a main milling cutter box body, a middle supporting disc block, an outer ring frame and a circulating chain, the middle supporting disc block vertically slides on the inner side of the main milling cutter box body, and the outer ring frame surrounds the outer side of the middle supporting disc block; a gear on the inner side of the main milling cutter box body is tightly supported and rotationally meshed with a circulating chain, the inner side of the head end of the main milling cutter box body is fixedly connected with a central motor main shaft of an electric cooling fan, a side guide inclined frame is fixed on the inner side of the main milling cutter box body, a fixed lower supporting spring is arranged on the main milling cutter box body, and temperature sensing probes are fixed at the top of the main milling cutter box body in an array at intervals. When the temperature sensing probe detects that the temperature of the replaced milling cutter is too high, more parts of the milling cutter move downwards into the main milling cutter box body, the part, cooled by the electric cooling fan, of the milling cutter is enlarged, the cooling efficiency is improved, and the problems that the high-temperature overheated milling cutter needs to be replaced, the milling cutter mounting assembly is arranged in a semi-closed mode, and the natural cooling speed of the milling cutter is low are solved.

Description

Technical Field

[0001] The invention relates to the technical field of milling cutter installation components, in particular to an overheated self-shrinking protective milling cutter installation component. Background Art

[0002] A milling cutter is a tool used for milling processing in a milling machine. The milling machine controls the milling cutter to rotate at high speed. The high-speed rotating milling cutter comes into contact with metal parts and other materials to remove, shape and surface process metal and other materials.

[0003] The existing milling machine can automatically replace the milling cutter. The replaced milling cutter is automatically replaced and placed in the corresponding milling cutter installation assembly. When the milling cutter rotates at high speed and contacts the metal, the milling cutter itself will overheat. The overheated milling cutter will reduce its hardness and wear faster. Therefore, the overheated milling cutter must be replaced. The milling cutter waits for cooling in the milling cutter installation assembly. The milling cutter installation assembly is a semi-closed setting, and the natural cooling speed of the milling cutter is slow. Summary of the invention

[0004] The disclosed embodiment relates to an overheated self-shrinking protective milling cutter installation assembly, in which an electric cooling fan rotates to promote air flow to cool the milling cutter, and when the temperature sensor probe detects that the temperature of the replaced milling cutter is too high, the middle branch disk block and the milling cutter move downward synchronously, and more parts of the milling cutter enter the interior of the main milling cutter box, thereby expanding the part of the milling cutter cooled by the electric cooling fan and improving the cooling efficiency of the milling cutter. In the process of the middle branch disk block, the milling cutter and the outer ring frame moving downward, the outer sliding column rotates toward one side along the side guide inclined frame, and the outer ring frame moves away from the upper ring frame. The downward movement of the outer ring frame drives the middle branch disk block away from the middle milling cutter, and the middle branch disk block will not always fit the milling cutter, thereby increasing the contact area between the milling cutter and the airflow, promoting uniform cooling of the milling cutter, and accelerating the cooling speed of the milling cutter.

[0005] In a first aspect of the present disclosure, there is provided an overheating self-contracting protective milling cutter installation assembly, specifically comprising: a main milling cutter housing, a middle support disk block, an outer ring frame and a circulating chain, wherein a middle support disk block is vertically slidably provided on the inner side of the main milling cutter housing, an outer ring frame is surrounded by the outer side of the middle support disk block, an inner gear of the main milling cutter housing is tightly supported and rotated with a circulating chain, an inner cross bar at the head end of the main milling cutter housing is fixedly connected to the central motor spindle of an electric cooling fan, an inner spacing array of the main milling cutter housing has a fixed side guide inclined frame, an inner spacing array of the main milling cutter housing has a fixed lower support spring, a temperature sensor probe is fixedly provided on the top spacing array of the main milling cutter housing, and a milling cutter installation hole is opened through the top of the main milling cutter housing.

[0006] In at least some embodiments, the milling cutter mounting hole and the temperature sensor probe are aligned in center, the upper end of the lower support spring is fixedly connected to the bottom of the middle support disk block, the lower support spring supports the middle support disk block to move upward, and the milling cutter mounting hole and the center of the middle support disk block are axially aligned.

[0007] In at least some embodiments, the top annular array of the middle branch disk block has a sliding inner support block, the top of the inner support block is provided with an upper guiding slope, the back of the inner support block is slidably connected to a back connecting slide, the sliding of the back connecting slide adapts to the vertical position change when supported by the back support rod, the upper and lower rotating shafts of the back connecting slide cooperate with the back support rod to rotate, and a lower bracket is fixed to the outer side of the lower part of the middle branch disk block.

[0008] In at least some embodiments, a side connecting slide column slides through the outer side of the outer ring frame, the upper part of the side connecting slide column is fixedly connected to the upper ring frame, a cam column slides at the lower part of the outer ring frame, an outer rotating column rotates at the lower part of the outer ring frame and a return spring is provided, the cam column and the outer rotating column are slidably connected, and an inner rotating column rotates on the inner side of the outer rotating column.

[0009] In at least some embodiments, the inner support blocks are arranged in an array around the center of the middle support disk block, and the upper guide slope is gradually narrowed toward the top. The milling cutter pushes the upper guide slope and the inner support block to move toward the outside, and the tail end of the upper back support rod of the back connecting slide is rotatably connected to the upper ring frame shaft, and the tail end of the lower back support rod of the back connecting slide is rotatably connected to the outer ring frame shaft, and the two back support rods of the back connecting slide are arranged opposite to each other in an eight-shaped shape.

[0010] In at least some embodiments, the center of the cam column and the side connecting slide column are slidably connected, the inner rotating column and the inclined cam disc in the cam column are slidably connected, an outer support spring is fixed to the bottom of the outer rotating column, the lower end of the outer support spring is fixedly connected to the lower bracket, the lower end of the side connecting slide column is fixedly connected to the lower bracket, the outer support spring supports the outer ring frame to move upward, the outer ring frame drives the back support rod at the lower part of the back connecting slide frame to move upward, and the back support rod pushes the inner support block and the milling cutter to keep them clamped and fit.

[0011] In at least some embodiments, the lower side of the circulating chain and the lower guide bevel are fixed, the lower guide bevel and the upper part of the lower slide frame slide horizontally, one side of the circulating chain is engaged with the main shaft gear of the driving motor, the lower slide frame is above the lower bracket, and the circulating chain is extended or shortened according to the number of middle branch disk blocks.

[0012] In at least some embodiments, the lower slide frame and the inner side of the main milling cutter box are fixed, the driving motor and the inner side bracket of the main milling cutter box are fixed, when the lower guide bevel block and the lower bracket slide, the middle support disk block and the outer ring frame move downward synchronously, the outer sliding column rotates to one side along the side guide bevel frame, the outer rotating column moves away from the upper ring frame, the inner rotating column of the outer rotating column moves toward a lower position along the cam column, the outer rotating column and the outer ring frame move downward synchronously, the outer ring frame moves away from the upper ring frame, the outer ring frame pulls the inner support block to move outward through the back support rod, and the inner support block moves away from the middle milling cutter.

[0013] The present invention provides an overheated self-shrinking protective milling cutter mounting assembly, which has the following beneficial effects: The rotation of the electric cooling fan promotes air flow to cool the milling cutter. When the temperature sensor detects that the temperature of the replaced milling cutter is too high, the middle support plate and the milling cutter move down synchronously, and more parts of the milling cutter enter the main milling cutter box, expanding the part of the milling cutter cooled by the electric cooling fan, thereby improving the cooling efficiency of the milling cutter.

[0014] The outer support spring drives the middle support disk block to surround and clamp the middle milling cutter. The middle support disk block supports the milling cutter in the center, so that the milling cutter remains in a vertical state, ensuring that the center of the milling cutter and the milling cutter mounting hole are aligned, which facilitates the automatic alignment and replacement operation of the milling cutter.

[0015] During the downward movement of the middle branch disk block, the milling cutter and the outer ring frame, the outer sliding column rotates to one side along the side guide inclined frame, and the outer ring frame moves away from the upper ring frame. The downward movement of the outer ring frame drives the middle branch disk block away from the milling cutter in the middle. The middle branch disk block will not always fit the milling cutter, which increases the contact area between the milling cutter and the airflow, promotes uniform cooling of the milling cutter, and accelerates the cooling speed of the milling cutter.

[0016] The circulating chain drives the lower guiding inclined block to move to guide the downward movement of multiple middle branch disk blocks and milling cutters, eliminating the need for a single lifting component for the middle branch disk blocks. The circulating chain is extended or shortened according to the number of middle branch disk blocks, thereby improving compatibility and reducing lifting costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings of the embodiment are briefly introduced below.

[0018] The drawings described below are only related to some embodiments of the present invention, but are not intended to limit the present invention.

[0019] In the attached picture: Figure 1 A schematic diagram showing the main milling cutter housing structure of the present application is shown; Figure 2 A schematic diagram showing the structure of the main milling cutter box of the present application after vertical sectioning; Figure 3 A schematic diagram showing the structure of the middle support plate block, the outer ring frame and the circulating chain of the present application is shown; Figure 4 A schematic diagram showing the outer ring frame structure of the present application is shown; Figure 5 The schematic diagram of the structure of the middle support plate block and the outer ring frame of the present application is shown; Figure 6 A schematic structural diagram of a cross section of an outer rotating column of the present application is shown; Figure 7 A schematic diagram showing the circulating chain structure of the present application is shown; Figure 8 It shows a schematic diagram of the structure of the main milling cutter housing and the middle support disc block, the outer ring frame and the circulating chain after being separated; Reference numerals list 1. Main milling cutter housing; 101. Electric cooling fan; 102. Side guide inclined frame; 103. Lower support spring; 104. Temperature sensor probe; 105. Milling cutter mounting hole; 2. Middle support plate block; 201. Inner support block; 202. Upper guide slope; 203. Back connecting slide; 204. Back support rod; 205. Lower bracket; 3. Outer ring frame; 301. Side connecting slide column; 302. Upper ring frame; 303. Cam column; 304. Inner rotating column; 305. Outer rotating column; 306. Outer slide column; 307. Outer support spring; 4. Circular chain; 401. Lower guide inclined block; 402. Lower slide frame; 403. Driving motor. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Example 1: Please refer to Figures 1 to 8 : The present invention proposes a protective milling cutter installation assembly that self-contracts when overheated, comprising: a main milling cutter housing 1, a middle support disk block 2, an outer ring frame 3 and a circulating chain 4, the inner cross bar at the head end of the main milling cutter housing 1 is fixedly connected to the central motor spindle of an electric cooling fan 101, the inner spacer array of the main milling cutter housing 1 has a fixed side guide inclined frame 102, the inner spacer array of the main milling cutter housing 1 has a fixed lower support spring 103, the lower support spring 103 is a spiral spring structure, the top spacer array of the main milling cutter housing 1 is fixed with a temperature sensor probe 104, a milling cutter installation hole 105 is opened through the top of the main milling cutter housing 1, the milling cutter installation hole 105 and the temperature sensor probe 104 are aligned in the center, the upper end of the lower support spring 103 is fixedly connected to the bottom of the middle support disk block 2, and the lower The support spring 103 supports the middle support disk block 2 to move upward, and the milling cutter mounting hole 105 is aligned with the center axis of the middle support disk block 2. The middle support disk block 2 is vertically below the milling cutter mounting hole 105. The middle support disk block 2 is vertically slidable on the inner side of the main milling cutter box 1. The top annular array of the middle support disk block 2 has a sliding inner support block 201. The top of the inner support block 201 is provided with an upper guide slope 202. The upper guide slope 202 is set to lower and tilt toward the middle side of the middle support disk block 2. The back of the inner support block 201 is slidably connected to a back connecting slide 203. The sliding of the back connecting slide 203 adapts to the vertical position change when supported by the back support rod 204. The upper and lower rotating shafts of the back connecting slide 203 are matched with the back support rod 204 for rotation. A lower bracket 205 is fixed to the outer side of the lower part of the middle support disk block 2. The outer side of the middle support disk block 2 is surrounded by an outer ring frame 3, and the outer ring frame 3 is a circular ring structure. The outer side of the outer ring frame 3 is penetrated and slidably provided with a side connecting sliding column 301. The upper part of the side connecting sliding column 301 is fixedly connected to the upper ring frame 302. The upper ring frame 302 is a circular ring structure. The lower part of the outer side of the outer ring frame 3 is vertically axially slidable with a cam column 303. The lower part of the outer ring frame 3 is rotated with an outer rotating column 305 and a return coil spring is provided. The cam column 303 and the outer rotating column 305 are slidably connected. The inner side of the outer rotating column 305 is rotated with an inner rotating column 304. The inner support block 201 is arranged in an array around the center of the circle of the middle support disk block 2, and the upper guide inclined surface 202 is gradually narrowed toward the top. The milling cutter pushes the upper guide inclined surface 202 and the inner support block 201 to move outward, and the tail end of the upper back support rod 204 of the back connecting slide 203 and the upper ring frame 3 02 rotating shaft cooperates with rotation connection, the back is connected to the bottom of the slide 203, the lower side of the circulating chain 4 and the lower guide bevel 401 are fixed, the lower part of the lower guide bevel 401 is a gradually narrowing trapezoidal structure, and both sides of the lower part of the lower guide bevel 401 are inclined surfaces, and the lower guide bevel 401 and the upper part of the lower slide 402 slide horizontally, one side of the circulating chain 4 is meshed with the main shaft gear of the driving motor 403, and the lower slide 402 is above the lower bracket 205, and the circulating chain 4 is extended or shortened according to the number of middle branch disk blocks 2 to adapt to the different installation numbers of middle branch disk blocks 2, with high compatibility and lower cost. The tail end of the back support rod 204 and the outer ring frame 3 rotating shaft cooperate with rotation connection, and the two back support rods 204 on the back of the back-connected slide 203 are arranged in an eight-shaped pattern opposite to each other, and the inner gear of the main milling cutter box 1 is tightly supported and meshed with the circulating chain 4.

[0022] In the present disclosure, Figure 3 , 5 As shown, the center of the cam column 303 and the side connecting slide column 301 are slidably connected, the inner rotating column 304 and the inclined cam disc in the cam column 303 are slidably connected, and an outer supporting spring 307 is fixed to the bottom of the outer rotating column 305. The outer supporting spring 307 is a spiral spring structure, and the lower end of the outer supporting spring 307 is fixedly connected to the lower bracket 205. The lower end of the side connecting slide column 301 is fixedly connected to the lower bracket 205. The outer supporting spring 307 supports the outer ring frame 3 to move upward, and the outer ring frame 3 drives the back supporting rod 204 at the bottom of the back connecting slide 203 to move upward, and the back supporting rod 204 pushes the inner supporting block 201 and the milling cutter to keep clamped and fit, and the four inner supporting blocks 201 of the annular array surround and clamp the middle milling cutter, and the four inner supporting blocks 201 of the annular array support the milling cutter in the center.

[0023] In the present disclosure, Figure 2 , 6As shown in , 7, the lower slide frame 402 is fixed to the inner side of the main milling cutter housing 1, the driving motor 403 is fixed to the inner bracket of the main milling cutter housing 1, and when the lower guide inclined block 401 and the lower bracket 205 slide, the middle support plate block 2 and the outer ring frame 3 move downward synchronously, and the outer sliding column 306 rotates toward one side along the side guide inclined frame 102 while moving downward, and the outer sliding column 306 and the outer rotating column 305 move downward and away from the upper ring frame 302 synchronously, and the inner rotating column 304 of the outer rotating column 305 moves toward the lower position along the cam column 303 The outer rotating column 305 and the outer ring frame 3 move downward synchronously, the outer ring frame 3 moves away from the upper ring frame 302, and the outer ring frame 3 pulls the inner support block 201 to move outward through the back support rod 204. The inner support block 201 is away from the milling cutter in the middle. The distance between the inner support blocks 201 is greater than the width of the milling cutter. The inner support block 201 will not always fit the milling cutter, and the milling cutter will tilt. A spacing space will appear between the milling cutter and the inner support block 201. The spacing space increases the contact surface between the milling cutter and the airflow, thereby accelerating the uniform cooling of the milling cutter.

[0024] Embodiment 2: On the basis of embodiment 1, the side guiding inclined frame 102 is an annular frame structure whose height is lowered toward one side, and the side guiding inclined frame 102 surrounds the outer side of the outer rotating column 305, and the outer rotating column 305 slides on the inner side of the side guiding inclined frame 102 of the annular frame structure, so that the side guiding inclined frame 102 moves vertically while moving toward one side along the side guiding inclined frame 102 of the annular frame structure, thereby eliminating the need for a reset coil spring between the outer ring frame 3 and the outer rotating column 305.

[0025] The working principle of this embodiment is as follows: the replaced milling cutter passes through the milling cutter mounting hole 105 and moves downward, the lower end of the milling cutter contacts the upper guide bevel 202, the milling cutter pushes the upper guide bevel 202 and the inner support block 201 to move outward, the vertical surface of the inner support block 201 fits with the milling cutter, the outer support spring 307 supports the outer ring frame 3 to move upward, the outer ring frame 3 drives the back support rod 204 at the lower part of the back connecting slide 203 to move upward, the back support rod 204 pushes the inner support block 201 and the milling cutter to keep clamped and fit, the four inner support blocks 201 of the annular array surround and clamp the middle milling cutter, the four inner support blocks 201 of the annular array support the milling cutter in the center, the topmost lower end of the milling cutter contacts the top surface of the middle support disk block 2, so that the milling cutter remains in a vertical state, ensuring that the center of the milling cutter and the milling cutter mounting hole 105 are aligned, which is convenient for the alignment and replacement operation of the milling cutter automatic installation module; The lower half of the milling cutter is inside the main milling cutter box 1, and the electric cooling fan 101 rotates to promote air flow, and the air flows through to cool the milling cutter. The temperature sensor probe 104 performs temperature detection at multiple positions on the milling cutter through the milling cutter mounting hole 105. When the temperature sensor probe 104 detects that the temperature of the replaced milling cutter is too high, the drive motor 403 starts to drive the circulating chain 4 to rotate through the gear, and the circulating chain 4 drives the lower guide bevel block 401 to move along the lower slide frame 402. The lower side of the lower guide bevel block 401 fits the lower bracket 205, and the lower guide bevel block 401 guides the lower bracket 205 to move downward. The lower bracket 205, the middle support plate block 2, the outer ring frame 3 and the milling cutter move downward synchronously, and more parts of the milling cutter enter the main milling cutter box 1. The airflow of the electric cooling fan 101 contacts more milling cutter, expands the part of the milling cutter cooled by the electric cooling fan 101, improves the cooling efficiency of the milling cutter, and performs the operation of reducing the temperature of the milling cutter faster. The circulating chain 4 drives the lower guiding inclined block 401 to move and guide the single downward movement operation of multiple middle branch disk blocks 2 and milling cutters, eliminating the need to set up components such as lifting and telescopic cylinders for each middle branch disk block 2. The circulating chain 4 is extended or shortened according to the number of middle branch disk blocks 2 to adapt to the different installation quantities of the middle branch disk blocks 2, improve compatibility, and reduce the lifting and displacement control cost of the middle branch disk blocks 2; during the downward movement of the middle branch disk blocks 2, the milling cutter and the outer ring frame 3, the outer sliding column 306 and the side guiding inclined frame 102 slide and fit, the outer sliding column 306 rotates toward one side along the inclined surface of the side guiding inclined frame 102, the outer sliding column 306 and the outer rotating column 305 rotate synchronously, and the outer rotating column 305 The inner rotating column 304 moves downward along the cam column 303, the outer rotating column 305 and the outer ring frame 3 move downward synchronously, the outer ring frame 3 moves away from the upper ring frame 302, and the outer ring frame 3 pulls the inner support block 201 to move outward through the back support rod 204. The inner support block 201 is away from the milling cutter in the middle. The distance between the inner support blocks 201 is greater than the width of the milling cutter. The inner support block 201 will not always fit the milling cutter, and the milling cutter will tilt. A spacing space will appear between the milling cutter and the inner support block 201. The spacing space increases the contact surface between the milling cutter and the airflow, promotes uniform cooling of the milling cutter, speeds up the cooling speed of the milling cutter, and avoids the situation where the milling cutter and the inner support block 201 are in contact with each other and the cooling speed is slow.

[0026] In this article, there are a few points to note: 1. The drawings of the embodiments of the present disclosure only involve structures related to the embodiments of the present disclosure, and other structures may refer to general designs.

[0027] 2. In the absence of conflict, the embodiments of the present disclosure and the features therein may be combined with each other to obtain new embodiments.

[0028] The above are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A protective milling cutter mounting assembly that shrinks when overheated, comprising: A main milling cutter housing (1), a middle support disk block (2), an outer ring frame (3) and a circulating chain (4); characterized in that a middle support disk block (2) is vertically slidably provided on the inner side of the main milling cutter housing (1), an outer ring frame (3) surrounds the outer side of the middle support disk block (2), a circulating chain (4) is rotatably engaged with the inner gear of the main milling cutter housing (1), the inner side of the head end of the main milling cutter housing (1) is fixedly connected to the central motor spindle of the electric cooling fan (101), an inner spacer array of the main milling cutter housing (1) has a fixed side guide inclined frame (102), an inner spacer array of the main milling cutter housing (1) has a fixed lower support spring (103), a top spacer array of the main milling cutter housing (1) is fixed with a temperature sensor probe (104), and a milling cutter mounting hole (105) is opened through the top of the main milling cutter housing (1).

2. The overheated self-shrinking protective milling cutter mounting assembly according to claim 1, characterized in that: The milling cutter mounting hole (105) and the temperature sensing probe (104) are centrally aligned, the upper end of the lower support spring (103) is fixedly connected to the bottom of the middle support disk block (2), the lower support spring (103) supports the middle support disk block (2) to move upward, and the milling cutter mounting hole (105) and the middle support disk block (2) are centrally aligned axially.

3. The overheated self-shrinking protective milling cutter mounting assembly according to claim 1, characterized in that: The top annular array of the middle support disk block (2) comprises a sliding inner support block (201), the top of the inner support block (201) is provided with an upper guiding inclined surface (202), the back of the inner support block (201) is slidably connected to a back connecting slide (203), the upper and lower rotating shafts of the back connecting slide (203) are matched with a back support rod (204) for rotation, and a lower bracket (205) is fixed to the outer side of the lower part of the middle support disk block (2).

4. The overheated self-shrinking protective milling cutter mounting assembly according to claim 3, characterized in that: A side connection slide post (301) is slidably penetrated through the outer side of the outer ring frame (3); the upper part of the side connection slide post (301) is fixedly connected to the upper ring frame (302); a cam post (303) is slidably provided at the lower part of the outer ring frame (3); an outer rotating post (305) is rotatably provided at the lower part of the outer ring frame (3); the cam post (303) and the outer rotating post (305) are slidably connected; and an inner rotating post (304) is rotatably provided at the inner side of the outer rotating post (305).

5. The overheated self-shrinking protective milling cutter mounting assembly according to claim 4, characterized in that: The inner support blocks (201) are arranged in an array around the center of the middle support disk block (2), the upper guide slope (202) is arranged to be gradually narrowed toward the top, the tail end of the upper back support rod (204) of the back connection slide (203) is rotatably connected to the upper ring frame (302) shaft, and the tail end of the lower back support rod (204) of the back connection slide (203) is rotatably connected to the outer ring frame (3) shaft.

6. The overheated self-shrinking protective milling cutter mounting assembly according to claim 5, characterized in that: The center of the cam column (303) and the side connecting slide column (301) are slidably connected, the inner rotating column (304) and the inclined convex plate in the cam column (303) are slidably connected, the bottom of the outer rotating column (305) is fixed with an outer support spring (307), the lower end of the outer support spring (307) is fixedly connected to the lower bracket (205), and the lower end of the side connecting slide column (301) is fixedly connected to the lower bracket (205).

7. The overheated self-shrinking protective milling cutter mounting assembly according to claim 6, characterized in that: The lower side of the circulating chain (4) and the lower guide inclined block (401) are fixed, the lower guide inclined block (401) and the upper part of the lower slide frame (402) slide horizontally, one side of the circulating chain (4) is meshed with the main shaft gear of the driving motor (403), and the lower slide frame (402) is located above the lower bracket (205).

8. The overheated self-shrinking protective milling cutter mounting assembly according to claim 7, characterized in that: The lower slide frame (402) is fixed to the inner side of the main milling cutter housing (1), and the drive motor (403) is fixed to the inner side of the main milling cutter housing (1). When the lower guide inclined block (401) and the lower bracket (205) slide, the middle support plate block (2) and the outer ring frame (3) move downward synchronously, the outer slide column (306) rotates toward one side along the side guide inclined frame (102), and the outer rotating column (305) moves away from the upper ring frame (302).

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