Gap eliminating device for main shaft of numerical control machine tool

Abstract

The invention discloses a gap eliminating device for a numerical control machine tool spindle, and belongs to the field of numerical control machine tool spindles, the gap eliminating device comprises a spindle body, an eliminating mechanism is mounted on the surface of the spindle body, a heat dissipation mechanism is mounted on the surface of the eliminating mechanism, and an adjusting mechanism is mounted on the surface of the heat dissipation mechanism; the adjusting mechanism is mounted on a mounting cylinder on the surface of the heat dissipation mechanism; through cooperative use of all the devices and arrangement of an eliminating mechanism, a heat dissipation mechanism, an adjusting mechanism, a supporting mechanism and other structures, when the temperature of a main shaft body is too high and a connecting sleeve and an elastic piece move through thermal expansion, a hollow pipe and a sliding rod are synchronously driven to move, so that a pushing block moves upwards on one side of a sealing plate, and the sealing effect is achieved. And through mutual cooperation of the pin shaft and the connecting block, one side of the sealing plate is turned upwards, so that more heat dissipation mechanisms are exposed, the heat dissipation effect of the elimination mechanism and the heat dissipation mechanisms is improved, and the heat dissipation efficiency of the main shaft body is improved.

Description

Technical Field

[0001] The invention relates to the technical field of CNC machine tool spindles, in particular to a gap eliminating device for CNC machine tool spindles. Background Art

[0002] CNC machine tool is the abbreviation of digital control machine tool. It is an automated machine tool equipped with a program control system. The control system can logically process programs specified by control codes or other symbolic instructions, decode them, and express them in coded numbers. The information carrier is input into the CNC device, and various control signals are sent out by the CNC device after calculation and processing to control the movement of the machine tool. The parts are automatically processed according to the shape and size required by the drawing. The spindle is a key functional component in precision machining CNC machine tools. The design, manufacture and performance of the spindle directly affect the overall development level of the machining machine tool. The key to achieving precision machining of the spindle is that the spindle can not only achieve high-speed and low-speed rotation during operation, but also has high operation accuracy and low vibration. At the same time, the spindle should have sufficient rigidity to withstand the cutting loads from radial and axial directions.

[0003] After searching, Chinese patent number CN 115971945 A discloses a gap elimination device for a CNC machine tool spindle, comprising: a fixed sleeve, the fixed sleeve has a sleeve-shaped structure with one end sealed, and a positioning hole opened on one side of the fixed sleeve, the inner wall of the positioning hole is fixedly connected with a positioning device, and the part of the fixed sleeve located on one side of the positioning device is provided with a spindle; the positioning device comprises: a positioning block, the positioning block has a square block structure, and a positioning sleeve arranged on the positioning block, the positioning sleeve passes through the positioning block and is fixedly connected to the positioning block, and the inner wall of the positioning sleeve is fixedly connected with a sliding plug; an extrusion block, the extrusion block is arranged on one side of the positioning block, and the present invention relates to the technical field of CNC machine tool spindles. The gap elimination device for a CNC machine tool spindle enables the extrusion block to be tightly attached to the end of the spindle whether the spindle is expanding or contracting, so as to facilitate the elimination of the gap generated by the spindle during use.

[0004] However, the above prior art still has the following problems: When the spindle is heated, the axial distance is elongated, and at the same time, the heat is transferred to the inside of the positioning sleeve. The heat expansion medium inside the positioning sleeve expands due to the heat, pushing the sliding plug to move. The sliding plug drives the extrusion block to move through the push rod, and the expansion of the spindle can be adapted to by the movement of the sliding plug. On the contrary, when the temperature of the spindle is lowered, the sliding plug can drive the extrusion block to move toward the direction of the spindle through the push rod, so that no matter the spindle expands or contracts, the extrusion block can be tightly attached to the end of the spindle, thereby facilitating the elimination of the gap generated during the use of the spindle.

[0005] When the above-mentioned gap eliminating device for the spindle of a CNC machine tool is in use, when the temperature of the spindle is too high or too low, the gap is eliminated by the gap eliminating device, but the spindle cannot be cooled down or heated up quickly, which may cause the spindle temperature to remain high or low continuously, causing problems such as large spindle vibration and noise, which may cause the spindle to wear and affect the use of the spindle.

[0006] Therefore, the present invention provides a clearance eliminating device for a spindle of a numerically controlled machine tool to solve the above-mentioned problem. Summary of the invention

[0007] 1. Technical issues to be resolved The present invention provides a clearance eliminating device for a spindle of a numerically controlled machine tool, aiming to solve the problem that the existing clearance eliminating device for a spindle of a numerically controlled machine tool mentioned in the background technology cannot quickly cool down or heat up the spindle, which may cause the spindle temperature to remain high or low continuously, resulting in problems such as large spindle vibration and noise, and may cause wear of the spindle, affecting the use of the spindle.

[0008] (II) Technical solution To achieve the above object, the present invention provides the following technical solution: a clearance eliminating device for a spindle of a numerically controlled machine tool, comprising a spindle body, a surface of the spindle body having an eliminating mechanism installed, a surface of the eliminating mechanism having a heat dissipation mechanism installed, and a surface of the heat dissipation mechanism having an adjusting mechanism installed; The adjustment mechanism is installed on the installation cylinder on the surface of the heat dissipation mechanism, and the two edges at both ends of the installation cylinder are rotatably connected with connection blocks rotatably connected to the installation cylinder through pin shafts, and the surface of the connection block is fixedly connected with a closing plate rotatably connected to the installation cylinder, and the closing plate corresponds to the installation cylinder, and one side of the closing plate is symmetrically fitted with two corresponding sliding rods, and the surface of the sliding rod is slidably sleeved with a hollow tube, and the interior of the hollow tube is fixedly connected with an elastic rod fixedly connected to the sliding rod; A supporting mechanism is installed on the surface of the heat dissipation mechanism close to the adjustment mechanism.

[0009] As a preferred technical solution of the present application, the elimination mechanism includes an elastic sleeve slidably connected to the surface of the main shaft body, the inner arc surface of the elastic sleeve is fixedly connected to the first magnet block in an annular array, the outer arc surface of the elastic sleeve is fixedly connected to the connecting sleeve, the outer arc surface of the connecting sleeve is fixedly connected to the elastic block in an annular array, and the surfaces of several of the elastic blocks are commonly fixedly connected to a rigid part corresponding to the elastic sleeve.

[0010] As a preferred technical solution of the present application, the elimination mechanism also includes a metal thermal expansion material fixedly connected to the surface of the rigid part and corresponding to the elastic sleeve, and the surface of the metal thermal expansion material is fixedly connected to an elastic sheet fixedly connected to the elastic sleeve.

[0011] As a preferred technical solution of the present application, the elimination mechanism also includes second magnet blocks fixedly connected to the surface of the main shaft body in a circular array, a number of the second magnet blocks correspond one-to-one to a number of first magnet blocks, the second magnet blocks and the first magnet blocks have the same poles, the mounting tube is fixedly sleeved on the surface of the elastic sheet and the elastic sleeve, and the main shaft body is rotatably connected to the mounting tube.

[0012] As a preferred technical solution of the present application, the heat dissipation mechanism includes four arc-shaped sealing plates which are respectively fixedly connected to the two edges of the two ends of the elastic sleeve and correspond to the main shaft body. The surfaces of every two corresponding arc-shaped sealing plates are in a circular array and are commonly fixedly connected to a heat dissipation rod fixedly connected to the mounting tube. The surface of the mounting tube is in a circular array and is fixedly connected to a heat dissipation block.

[0013] As a preferred technical solution of the present application, the support mechanism includes two hollow plates that are rotatably connected to the middle part of one side of the arc-shaped sealing plate and the closing plate through pin shafts, and two corresponding clamping springs are symmetrically fixedly connected to the interior of the hollow plate. One end of the four clamping springs is commonly fixedly connected to a support plate, and the two support plates are slidably inserted into the interior of the two hollow plates.

[0014] As a preferred technical solution of the present application, two corresponding counterweights are symmetrically fixedly connected to the other side of the closing plate, one end of the sliding rod is fixedly connected to an extension plate, and an edge of one side of the extension plate is fixedly connected to a pushing block that fits the closing plate.

[0015] As a preferred technical solution of the present application, the weight of the counterweight block is greater than the elastic force of the elastic rod, and one end of the four hollow tubes is fixedly connected to the two sides of the connecting sleeve respectively.

[0016] (III) Beneficial effects 1. Through the arrangement of the elimination mechanism, heat dissipation mechanism, adjustment mechanism and support mechanism, when the temperature of the main body of the spindle is too high, the heat on the surface of the main body of the spindle is absorbed by the elastic sleeve, and is transferred to the surface of the rigid part through the connecting sleeve, thereby increasing the temperature of the rigid part, so that the metal thermal expansion material expands when it encounters heat, pushing the elastic sheet to deform, thereby eliminating the gap of the main body of the spindle. At the same time, when the connecting sleeve and the elastic sheet move due to thermal expansion, they synchronously drive the hollow tube and the sliding rod to move, so that the pushing block moves upward on one side of the closing plate, so that one side of the closing plate is turned upward through the mutual cooperation of the pin shaft and the connecting block, so that more heat is leaked from the heat dissipation mechanism, thereby improving the heat dissipation effect of the elimination mechanism and the heat dissipation mechanism, thereby improving the heat dissipation efficiency of the main body of the spindle; 2. Through the arrangement of the elimination mechanism, heat dissipation mechanism, adjustment mechanism and support mechanism, when the temperature of the main body of the spindle is too low, the main body of the spindle shrinks, thereby deforming the elastic sleeve, so that the elastic sleeve continues to fit on the main body of the spindle, so that the connecting sleeve and the elastic sheet drive the metal thermal expansion material to shrink, thereby deforming the connecting sleeve, the elastic sheet and the elastic sleeve, so that the sliding rod and the hollow tube drive the push block to move downward on one side of the closing plate, so that through the mutual cooperation of the pin shaft and the connecting block, one side of the closing plate is turned downward to block the two sides of the installation tube, so that the air flow speed inside the installation tube is slowed down, thereby reducing the heat dissipation effect of the heat dissipation mechanism and the elimination mechanism, and improving the efficiency of the main body of the spindle heating through the rotation of the main body of the spindle; 3. By setting up structures such as the elimination mechanism, the heat dissipation mechanism, the adjustment mechanism and the support mechanism, and by setting up the first magnet block and the second magnet block with the same pole, the corresponding magnet blocks on both sides repel each other with the same poles, and support is provided between the main shaft body and the elastic sleeve, so that the elastic sleeve does not fit with the main shaft body while eliminating the gap in the main shaft body, thereby reducing the wear of the main shaft body. At the same time, through the setting of the support mechanism, when the main shaft body is offset during use, the main shaft body is supported by the tightening spring and the support plate, thereby reducing the wear of the main shaft under normal and eccentric conditions, and facilitating the protection of the main shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a clearance elimination device for a CNC machine tool spindle; Figure 2 It is a structural schematic diagram of an adjustment mechanism in a clearance elimination device for a CNC machine tool spindle; Figure 3 It is a structural schematic diagram of an elimination mechanism in a clearance elimination device for a spindle of a CNC machine tool; Figure 4 It is a schematic diagram of the structure of the disassembled elimination mechanism in a clearance elimination device for a spindle of a CNC machine tool; Figure 5 It is a structural schematic diagram of a heat dissipation mechanism in a gap elimination device for a CNC machine tool spindle; Figure 6 for Figure 2 The enlarged schematic diagram at A in the middle; Figure 7 The present invention is a schematic diagram of the structure of a counterweight block in a clearance elimination device for a spindle of a CNC machine tool.

[0018] In the figure: 1. Spindle body; 2. Elimination mechanism; 201. Elastic sleeve; 202. First magnet block; 203. Rigid part; 204. Metal thermal expansion material; 205. Elastic sheet; 206. Second magnet block; 207. Connecting sleeve; 208. Elastic block; 3. Heat dissipation mechanism; 301. Arc sealing plate; 302. Heat dissipation rod; 303. Heat dissipation block; 4. Adjustment mechanism; 401. Mounting tube; 402. Connecting block; 403. Closing plate; 404. Sliding rod; 405. Hollow tube; 406. Elastic rod; 407. Counterweight block; 5. Support mechanism; 501. Hollow plate; 502. Clamping spring; 503. Support plate; 6. Extension plate. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] The present invention provides a clearance eliminating device for a spindle of a numerically controlled machine tool, such as Figure 1-Figure 7 As shown, a clearance eliminating device for a spindle of a numerically controlled machine tool comprises a spindle body 1, a surface of the spindle body 1 is provided with an eliminating mechanism 2, the eliminating mechanism 2 comprises an elastic sleeve 201 slidably sleeved on the surface of the spindle body 1, the inner arc surface of the elastic sleeve 201 is fixedly connected with a first magnet block 202 in an annular array, the outer arc surface of the elastic sleeve 201 is fixedly connected with a connecting sleeve 207, the outer arc surface of the connecting sleeve 207 is fixedly connected with an elastic block 208 in an annular array, the surfaces of several elastic blocks 208 are commonly fixedly connected with a rigid part 203 corresponding to the elastic sleeve 201, the eliminating mechanism 2 also comprises a metal thermal expansion material 204 fixedly connected to the surface of the rigid part 203 and corresponding to the elastic sleeve 201, when the temperature of the spindle body 1 is too high during use, The elastic sleeve 201 absorbs the heat on the main shaft body 1 and transfers it to the connecting sleeve 207. The elastic block 208 is used to transfer the heat of the connecting sleeve 207 to the rigid member 203, so that the heat is absorbed by the metal thermal expansion material 204, so that the metal thermal expansion material 204 expands when heated. The surface of the metal thermal expansion material 204 is fixedly connected with an elastic sheet 205 fixedly connected to the elastic sleeve 201. When the metal thermal expansion material 204 expands, the elastic sheet 205 is deformed, which can not only absorb the heat on the main shaft body 1 and accelerate the cooling of the main shaft body 1, but also continuously eliminate the gap of the main shaft body 1 through the setting of the elastic sheet 205, thereby avoiding the gap of the main shaft body 1 from affecting its use. The elimination mechanism 2 also includes a second magnet block 206 fixedly connected to the surface of the main shaft body 1 in an annular array, and a plurality of second magnet blocks 206 correspond to a plurality of first magnet blocks 202 one by one. The second magnet block 206 and the first magnet block 202 have the same polarity. The first magnet block 202 and the second magnet block 206 repel each other with the same polarity, so that the elastic sleeve 201 and the main shaft body 1 can support the main shaft body 1 without contacting each other, thereby avoiding the main shaft body 1 from being worn due to friction with the elastic sleeve 201 during use. The mounting cylinder 401 is fixedly sleeved on the surface of the elastic sheet 205 and the elastic sleeve 201, and the main shaft body 1 is rotatably connected to the mounting cylinder 401. A heat dissipation mechanism 3 is installed on the surface of the elimination mechanism 2. The heat dissipation mechanism 3 includes four arc-shaped sealing plates 301 respectively fixedly connected to the two edges of the two ends of the elastic sleeve 201 and corresponding to the main shaft body 1. When the main shaft body 1 is in use, the gap of the main shaft body 1 is eliminated through the mutual cooperation of the elastic sleeve 201 and the arc-shaped sealing plates 301 and other components. The surfaces of every two corresponding arc-shaped sealing plates 301 are in an annular array and are commonly fixedly connected with heat dissipation rods 302 fixedly connected to the mounting cylinder 401. The surface of the mounting cylinder 401 is in an annular array and is fixedly connected with heat dissipation blocks 303. Through the arrangement of the heat dissipation blocks 303, the heat dissipation effect of the mounting cylinder 401 is improved, thereby improving the heat dissipation efficiency of the main shaft body 1. An adjusting mechanism 4 is installed on the surface of the heat dissipation mechanism 3. The adjusting mechanism 4 is installed on the installation tube 401 on the surface of the heat dissipation mechanism 3. The two edges at both ends of the installation tube 401 are rotatably connected with a connecting block 402 which is rotatably connected to the installation tube 401 through a pin shaft. The surface of the connecting block 402 is fixedly connected with a closing plate 403 which is rotatably connected to the installation tube 401. Two corresponding counterweight blocks 407 are fixedly connected to the other side of the closing plate 403 in a symmetrical manner. The weight of the counterweight block 407 is greater than the elastic force of the elastic rod 406. By setting the counterweight block 407, the weight of the closing plate 403 is increased, so that when the sliding rod 404 drives the closing plate 403 to move, the closing plate 403 squeezes the sliding rod 404 and the elastic rod 406, so that the closing plate 403 is more stable when moving. The closing plate 403 corresponds to the mounting tube 401. When the metal thermal expansion material 204 expands and deforms, the elastic sheet 205 and the connecting sleeve 207 are simultaneously deformed, so that the hollow tube 405 moves following the deformation of the connecting sleeve 207, so that the corresponding sliding rods 404 move away from each other, so that the sliding rods 404 drive the extension plate 6 and the push block to slide on the surface of the closing plate 403. One side of the closing plate 403 is symmetrically fitted with two corresponding sliding rods 404, one end of the sliding rod 404 is fixedly connected to the extension plate 6, and one edge of one side of the extension plate 6 is fixedly connected to a pushing block that fits the closing plate 403. Through the arrangement with the extension plate 6, the sliding rod 404 has a larger contact area when pushing the closing plate 403, so that the sliding rod 404 can push the closing plate 403 more quickly. The surface of the sliding rod 404 is slidably sleeved with a hollow tube 405, and one end of the four hollow tubes 405 is respectively connected to the two ends of the connecting sleeve 207. The hollow tube 405 is fixedly connected to the side, and the interior of the hollow tube 405 is fixedly connected with an elastic rod 406 fixedly connected to the sliding rod 404. Through the elastic force of the elastic rod 406, the pushing block pushes the closing plate 403 to flip on the surface of the mounting tube 401 through the connecting block 402 and the pin shaft, so that the corresponding closing plates 403 are separated from each other, so that the heat dissipation rod 302 and the arc-shaped sealing plate 301 leak more, and the speed of air circulation inside the mounting tube 401 is improved, thereby improving the heat dissipation effect of the heat dissipation rod 302, so that the heat dissipation efficiency of the main shaft body 1 is improved when the temperature is too high; A supporting mechanism 5 is installed on the surface of the heat dissipation mechanism 3 near the adjusting mechanism 4. The supporting mechanism 5 includes two hollow plates 501 that are rotatably connected to the arc-shaped sealing plate 301 and the middle part of one side of the closing plate 403 through a pin shaft. Two corresponding holding springs 502 are fixedly connected to the inside of the hollow plate 501 in a symmetrical manner. One end of the four holding springs 502 is fixedly connected to the supporting plate 503. The two supporting plates 503 are slidably inserted into the inside of the two hollow plates 501. Through the arrangement of the two hollow plates 501, when the spindle body 1 is offset during use, the spindle body 1 pushes the arc-shaped sealing plate 301 to move, so that the hollow plates 501 move synchronously, so that the hollow plates 501 slide on the surface of the supporting plates 503 and squeeze the holding springs 502, so that the hollow plates 501 are supported by the elastic force of the holding springs 502, so that the hollow plates 501 support the arc-shaped sealing plate 301, thereby reducing the wear of the spindle under normal conditions and under eccentric conditions, and conveniently protecting the spindle.

[0021] Specifically, when the present CNC machine tool spindle clearance elimination device is in use: when the spindle body 1 is in use, the clearance of the spindle body 1 is eliminated through the mutual cooperation of the elastic sleeve 201 and the arc-shaped sealing plate 301 and other components. When the temperature of the spindle body 1 is too high during use, the elastic sleeve 201 absorbs the heat on the spindle body 1 and transfers it to the connecting sleeve 207. Through the setting of the elastic block 208, the heat of the connecting sleeve 207 is transferred to the rigid part 203, so that the heat is absorbed by the metal thermal expansion material 204, so that the metal thermal expansion material 204 expands when heated, so that the elastic sheet 205 is deformed, which can not only absorb the heat on the spindle body 1 and accelerate the cooling of the spindle body 1, but also can continuously eliminate the clearance of the spindle body 1 through the setting of the elastic sheet 205, thereby avoiding the clearance of the spindle body 1 affecting its use; At the same time, when the metal thermal expansion material 204 expands and deforms, the elastic sheet 205 and the connecting sleeve 207 are synchronously driven to deform, so that the hollow tube 405 moves following the deformation of the connecting sleeve 207, so that the corresponding sliding rods 404 move away from each other, so that the sliding rods 404 drive the extension plate 6 and the pushing block to slide on the surface of the closing plate 403, and through the elastic force of the elastic rod 406, the pushing block pushes the closing plate 403 to flip on the surface of the mounting tube 401 through the connecting block 402 and the pin shaft, so that the corresponding closing plates 403 move away from each other, so that more of the heat dissipation rod 302 and the arc-shaped sealing plate 301 leak out, thereby improving the speed of air circulation inside the mounting tube 401, thereby improving the heat dissipation effect of the heat dissipation rod 302, and improving the heat dissipation efficiency of the main shaft body 1 when the temperature is too high; When the temperature of the main shaft body 1 is too low, the metal thermal expansion material 204 and the elastic sleeve 201 shrink and deform, so that the connecting sleeve 207 drives the hollow tube 405 and the sliding rod 404 to move in the opposite direction, driving the extension plate 6 and the push block to move synchronously, so that the corresponding two closing plates 403 are close to each other, and the two ends of the mounting tube 401 are blocked and limited, thereby reducing the speed of air circulation inside the mounting tube 401, and at the same time reducing the leakage of the heat dissipation rod 302 and the arc-shaped sealing plate 301, thereby reducing the heat dissipation efficiency of the heat dissipation mechanism 3, and keeping the heat as much as possible inside the mounting tube 401, so as to quickly increase the temperature of the main shaft body 1.

[0022] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A clearance eliminating device for a spindle of a numerically controlled machine tool, comprising a spindle body (1), characterized in that: An elimination mechanism (2) is installed on the surface of the main shaft body (1), a heat dissipation mechanism (3) is installed on the surface of the elimination mechanism (2), and an adjustment mechanism (4) is installed on the surface of the heat dissipation mechanism (3); The adjustment mechanism (4) is mounted on a mounting tube (401) on the surface of the heat dissipation mechanism (3); both edges of both ends of the mounting tube (401) are rotatably connected to a connection block (402) rotatably connected to the mounting tube (401) via a pin shaft; a closing plate (403) rotatably connected to the mounting tube (401) is fixedly connected to the surface of the connection block (402); the closing plate (403) corresponds to the mounting tube (401); one side of the closing plate (403) is symmetrically fitted with two corresponding sliding rods (404); a hollow tube (405) is slidably sleeved on the surface of the sliding rod (404); an elastic rod (406) fixedly connected to the sliding rod (404) is fixedly connected to the inside of the hollow tube (405); A supporting mechanism (5) is installed on the surface of the heat dissipation mechanism (3) near the adjustment mechanism (4).

2. The backlash eliminating device for a CNC machine tool spindle according to claim 1, characterized in that: The elimination mechanism (2) comprises an elastic sleeve (201) slidably sleeved on the surface of the main shaft body (1); the inner arc surface of the elastic sleeve (201) is fixedly connected to a first magnet block (202) in an annular array; the outer arc surface of the elastic sleeve (201) is fixedly connected to a connecting sleeve (207); the outer arc surface of the connecting sleeve (207) is fixedly connected to an elastic block (208) in an annular array; and the surfaces of a plurality of the elastic blocks (208) are fixedly connected to a rigid member (203) corresponding to the elastic sleeve (201).

3. A clearance eliminating device for a CNC machine tool spindle according to claim 2, characterized in that: The elimination mechanism (2) further comprises a metal thermal expansion material (204) fixedly connected to the surface of the rigid part (203) and corresponding to the elastic sleeve (201); the surface of the metal thermal expansion material (204) is fixedly connected to an elastic sheet (205) fixedly connected to the elastic sleeve (201).

4. The clearance eliminating device for a CNC machine tool spindle according to claim 3, characterized in that: The elimination mechanism (2) further comprises second magnet blocks (206) fixedly connected to the surface of the main shaft body (1) in an annular array, a plurality of the second magnet blocks (206) corresponding one to one with a plurality of the first magnet blocks (202), the second magnet blocks (206) and the first magnet blocks (202) having the same polarity, the mounting tube (401) fixedly sleeved on the surfaces of the elastic sheet (205) and the elastic sleeve (201), and the main shaft body (1) is rotatably connected to the mounting tube (401).

5. The clearance eliminating device for a CNC machine tool spindle according to claim 3, characterized in that: The heat dissipation mechanism (3) comprises four arc-shaped sealing plates (301) respectively fixedly connected to the two edges at both ends of the elastic sleeve (201) and corresponding to the main shaft body (1); the surfaces of every two corresponding arc-shaped sealing plates (301) are in an annular array and are commonly fixedly connected to a heat dissipation rod (302) fixedly connected to the mounting cylinder (401); the surface of the mounting cylinder (401) is in an annular array and is fixedly connected to a heat dissipation block (303).

6. A clearance eliminating device for a CNC machine tool spindle according to claim 5, characterized in that: The support mechanism (5) comprises two hollow plates (501) which are rotatably connected to the middle of one side of the arc-shaped sealing plate (301) and the closing plate (403) respectively through pin shafts; two corresponding holding springs (502) are fixedly connected in a symmetrical manner inside the hollow plates (501); one end of the four holding springs (502) is fixedly connected to the support plate (503); and the two support plates (503) are slidably inserted into the interior of the two hollow plates (501).

7. The clearance eliminating device for a CNC machine tool spindle according to claim 3, characterized in that: The other side of the closing plate (403) is symmetrically fixedly connected to two corresponding counterweight blocks (407), one end of the sliding rod (404) is fixedly connected to an extension plate (6), and one edge of one side of the extension plate (6) is fixedly connected to a pushing block that fits the closing plate (403).

8. The clearance eliminating device for a CNC machine tool spindle according to claim 7, characterized in that: The weight of the counterweight block (407) is greater than the elastic force of the elastic rod (406), and one end of the four hollow tubes (405) is fixedly connected to two sides of the connecting sleeve (207) respectively.

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