A machine tool spindle device and adjustment method thereof

Abstract

The present invention provides a machine tool spindle device and an adjustment method thereof, the machine tool spindle device comprising: a mounting frame; a motor, the motor being fixedly mounted on the mounting frame; a positioning piece, the positioning piece being connected to the mounting frame by bolts, the positioning piece being provided with a first conical surface, the first conical surface being coaxial with the driving shaft of the motor, the radius of the first conical surface gradually decreasing from the end away from the motor to the end close to the motor; a rotating shaft mechanism, the positioning piece being sleeved on the rotating shaft mechanism, the rotating shaft mechanism comprising a fixed portion and a rotating portion, the rotating portion being rotatably connected to the fixed portion, the fixed portion being provided with a second conical surface, the second conical surface being abutted and matched with the first conical surface, so that the rotating portion is coaxial with the driving shaft. The machine tool spindle device of the present invention can quickly and efficiently install the rotating shaft while ensuring the coaxiality of the rotating shaft.

Description

Technical Field

[0001] The invention relates to the technical field of machine tool processing, and in particular to a machine tool spindle device and an adjustment method thereof. Background Art

[0002] In the prior art, the installation between rotating shafts needs to ensure the coaxiality between the shafts. Insufficient coaxiality may cause a series of problems, including but not limited to reduced equipment performance, reduced precision, and even equipment damage. This situation may occur in various mechanical and electronic equipment and manufacturing processes. In actual operation, it may be necessary to use professional measuring tools and technical means to detect coaxiality in order to more accurately locate the problem and formulate a solution. At the same time, regular maintenance and inspection are also one of the important measures to maintain stable coaxiality. In short, solving the problem of insufficient coaxiality requires comprehensive consideration of multiple aspects and taking effective measures to improve coaxiality to ensure the normal operation and stable performance of the equipment. In machine tool applications, the rotating axis between the high-speed spindle and the spindle motor needs to be coaxial. Generally, a clearance fit method is used, which cannot meet the higher coaxiality requirements. The high-speed rotating tool on the machine tool needs to have a higher coaxiality, and the tool needs to be replaced and disassembled frequently, so it is difficult to ensure the coaxiality of the rotating tool and the motor driving shaft. Therefore, a mounting device is needed that can quickly and efficiently install the rotating shaft while ensuring the coaxiality of the rotating shaft. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, an embodiment of the first aspect of the present invention provides a machine tool spindle device that can quickly and efficiently install a rotating shaft while ensuring the coaxiality of the rotating shaft.

[0004] The embodiment of the second aspect of the present invention further provides a method for adjusting a machine tool spindle device.

[0005] According to the first aspect of the present invention, the machine tool spindle device comprises: a mounting frame; a motor, which is fixedly mounted on the mounting frame; a positioning piece, which is connected to the mounting frame by bolts, and a first conical surface is provided on the positioning piece, the first conical surface is coaxial with the driving shaft of the motor, and the radius of the first conical surface gradually decreases from the end away from the motor to the end close to the motor; a rotating shaft mechanism, the positioning piece is sleeved on the rotating shaft mechanism, the rotating shaft mechanism comprises a fixed part and a rotating part, the rotating part is rotatably connected to the fixed part, and a second conical surface is provided on the fixed part, and the second conical surface abuts and cooperates with the first conical surface so that the rotating part is coaxial with the driving shaft; a coupling, the coupling comprises a first part and a second part, the first part is connected to the driving shaft, and the second part is connected to the rotating part so that the driving shaft is fixedly connected to the rotating part.

[0006] According to the first embodiment of the present invention, the machine tool spindle device has at least the following beneficial effects: when the rotating part and the driving shaft of the motor are connected and transmitted, the coaxiality between the rotating part and the driving shaft needs to be ensured. Through the cooperation between the first conical surface and the second conical surface, the rotating part and the first conical surface are kept at a high coaxiality, and the motor is fixed relative to the mounting machine, and the coaxiality between the first conical surface and the driving shaft can be adjusted by adjusting the position of the positioning piece. The positioning piece is connected to the mounting frame by bolts, and the position of the positioning piece can be adjusted to a certain extent by using the gap between the bolt and the mounting frame and the gap between the bolt and the positioning piece, so that the first conical surface on the positioning piece and the driving shaft on the motor have a high coaxiality. After obtaining a high coaxiality, the bolt is further tightened to maintain the coaxiality between the first conical surface and the driving shaft. And through the cooperation between the first conical surface and the second conical surface, the first conical surface and the rotating part have a high coaxiality. This can make the driving shaft and the rotating part have a high coaxiality. At the same time, the cooperation between the first conical surface and the second conical surface facilitates the disassembly and installation of the rotating shaft mechanism.

[0007] According to some embodiments of the present invention, a circular hole is formed on the mounting frame, the axis of the circular hole coincides with the axis of the driving shaft, the rotating part passes through the circular hole, and the fixing part is arranged and connected to one end of the circular hole away from the driving shaft.

[0008] According to some embodiments of the present invention, the positioning plate includes a main body and a boss connected to the main body, the first conical surface is arranged on the main body, the boss is arranged in the circular hole, and there is a gap between the inner side surface of the circular hole and the outer side surface of the boss.

[0009] According to some embodiments of the present invention, the radius of the through hole formed on the inner side surface of the boss is not less than the minimum radius of the first conical surface on the body.

[0010] According to some embodiments of the present invention, the gap between the inner side surface of the circular hole and the outer side surface of the boss does not exceed 2 mm.

[0011] According to some embodiments of the present invention, the angle between the first conical surface and the axial direction of the rotation axis is not more than 30° and not less than 10°.

[0012] According to some embodiments of the present invention, a side of the positioning piece facing away from the driving shaft is an abutment surface, and when the abutment surface abuts against the fixing portion, the first conical surface fits with the second conical surface.

[0013] According to some embodiments of the present invention, a plurality of grooves are arranged on the abutting surface, the grooves correspond to the bolts one by one, and the nuts of the bolts are arranged in the grooves.

[0014] According to the adjustment method of the machine tool spindle device of the second aspect of the present invention, which is used to adjust the machine tool spindle device described in any one of the above embodiments, the adjustment method of the machine tool spindle includes: pre-connecting the positioning plate to the mounting frame with bolts, wherein the extrusion pressure between the positioning plate and the mounting frame does not exceed 500N during pre-connection; measuring the coaxiality between the first conical surface and the driving shaft with a measuring device; adjusting the coaxiality between the first conical surface and the driving shaft by the gap between the bolt and the mounting frame; after adjusting the coaxiality between the first conical surface and the driving shaft, continuing to apply force to the bolt to increase the extrusion pressure between the positioning plate and the mounting frame.

[0015] According to some embodiments of the present invention, during pre-connection, the squeezing force between the positioning piece and the mounting frame is not less than 50N.

[0016] According to some embodiments of the present invention, after the coaxiality between the first conical surface and the driving shaft is adjusted, a force is continuously applied to the bolt so that the extrusion force between the positioning sheet and the mounting bracket is not less than 600N.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0019] Figure 1 A schematic diagram of the structure of a machine tool spindle device in one embodiment of the present invention;

[0020] Figure 2A cross-sectional schematic diagram of a machine tool spindle device in one embodiment of the present invention;

[0021] Figure 3 for Figure 2 An enlarged schematic diagram of the position of the first cone surface in FIG.

[0022] Figure 4 It is a structural schematic diagram of the rotating shaft mechanism in the present invention;

[0023] Figure 5 It is a schematic diagram of the structure of the positioning sheet in the present invention.

[0024] Reference numerals:

[0025] 1. Mounting frame; 11. Cavity; 12. Round hole; 2. Motor; 21. Driving shaft; 3. Positioning piece; 31. First conical surface; 32. Abutting surface; 33. Groove; 34. Boss; 35. Through hole; 4. Rotating shaft mechanism; 41. Fixed part; 411. Second conical surface; 42. Rotating part; 5. Coupling; 51. First part; 52. Second part; 6. Bolt. DETAILED DESCRIPTION

[0026] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0027] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0028] In the description of the present invention, "several" means more than one, "many" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0029] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0030] The low coaxiality of the transmission shaft may lead to a series of adverse consequences, which are mainly manifested in the following aspects:

[0031] 1. Reduced operational stability: Low coaxiality means that the distance difference between the bearing center lines at both ends of the transmission shaft in the same plane is large, which will cause instability in the transmission system during operation, such as vibration and shaking. This instability will directly affect the overall performance and service life of the mechanical device.

[0032] 2. Increased energy loss: Poor coaxiality will lead to increased energy loss in the transmission process, because when the transmission shaft transmits power, torque or speed, the axis does not overlap, which will generate additional friction and resistance, thereby reducing the transmission efficiency.

[0033] 3. Increased noise and wear: Low coaxiality will also cause abnormal noise when the transmission shaft is running, increasing noise pollution. At the same time, due to uneven force, it may cause increased wear of bearings, gears and other components, further shortening the service life of the transmission system.

[0034] 4. Reduced safety performance: The drive shaft is an important component of the mechanical device, and its coaxiality is directly related to the safety performance of the entire system. Poor coaxiality may cause serious accidents such as breakage or falling off of the drive shaft during high-speed operation, posing a threat to personnel and equipment.

[0035] Therefore, in order to ensure the stable, efficient and safe operation of the transmission system, the coaxiality of the transmission shaft should be strictly controlled and necessary measures should be taken to ensure that the coaxiality meets the design requirements.

[0036] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5The machine tool spindle device of the first aspect of the present invention comprises: a mounting frame 1, a positioning piece 3, a rotating shaft mechanism 4, a motor 2 and a coupling 5, wherein the motor 2 is fixedly mounted on the mounting frame 1; the positioning piece 3 is connected to the mounting frame 1 by a bolt 6, and a first conical surface 31 is provided on the positioning piece 3, the first conical surface 31 is coaxial with the driving shaft 21 of the motor 2, and the radius of the first conical surface 31 gradually decreases from the end away from the motor 2 to the end close to the motor 2; the positioning piece 3 is sleeved on the rotating shaft mechanism 4, and the rotating shaft mechanism 4 comprises a fixed portion 41 and a rotating portion 42, The rotating part 42 is rotatably connected to the fixed part 41, and the fixed part 41 is provided with a second conical surface 411, and the second conical surface 411 is abutted with the first conical surface 31 to make the rotating part 42 coaxial with the driving shaft 21; specifically, the axis of the rotating part 42 is coincident with the axis of the second conical surface 411, and when the second conical surface and the first conical surface are matched, the axis of the first conical surface coincides with the axis of the second conical surface, and the axis of the first conical surface also coincides with the axis of the driving shaft, so that when the first conical surface and the second conical surface are matched, the axis of the rotating part coincides with the axis of the driving shaft. The coupling 5 includes a first part 51 and a second part 52, the first part 51 is connected to the driving shaft 21, and the second part 52 is connected to the rotating part 42, so that the driving shaft 21 is fixedly connected to the rotating part 42. First, the positioning piece 3 and the motor 2 are installed on the mounting frame 1, so that the first conical surface 31 on the positioning piece 3 is coaxial with the driving shaft 21 of the motor 2. At this time, the coaxiality between the first conical surface 31 and the active shaft 21 is not high, or after long-term use, the coaxiality between the first conical surface 31 and the active shaft 21 is not high. After long-term use, the coaxiality between the first conical surface 31 and the active shaft 21 may be low due to factors such as wear and deformation. The positioning piece 3 is connected to the mounting frame 1 by bolts 6. When connected by bolts 6, there is a certain gap between the bolts 6 and the positioning piece 3 in the radial direction. When the positioning piece 3 and the mounting frame 1 are connected by bolts 6, the bolts 6 do not need to be tightened, so that when the positioning piece 3 is subjected to a certain force, the positioning piece 3 will move radially along the gap between the bolts 6 and the positioning piece 3. Thereby, the first conical surface 31 and the active shaft 21 have a higher coaxiality. After measuring the higher coaxiality, tighten the bolts 6 so that the positioning piece 3 cannot move to maintain the coaxiality between the first conical surface 31 and the active shaft 21.

[0037] There are many tools and methods for measuring coaxiality, which can be selected according to specific application scenarios and needs. The following are some common tools

[0038] 1. Concentricity gauge: It consists of two precision cylindrical measuring heads and can be used to measure cylindrical workpieces such as bearing holes, sleeves, and hubs to check their coaxiality.

[0039] 2. Center height meter: It is also one of the commonly used tools for measuring coaxiality.

[0040] 3. Three-point inside diameter measuring instrument: can be used to measure coaxiality.

[0041] 4. Coaxial meter: An instrument specially used to measure coaxiality. It determines the coaxiality by measuring the distance difference between the axis and the center axis based on the vibration during rotation or the optical measurement principle.

[0042] 5. Coordinate measuring machine: It can accurately measure the position of each point on the surface of an object, thereby calculating the true position of the axis and the position of the center of rotation in three-dimensional space.

[0043] According to some embodiments of the present invention, a cavity 11 is provided in the mounting frame 1, the motor 2 and the coupling 5 are provided in the cavity 11, and one end of the rotating part 42 is provided in the cavity 11. In order to prevent impurities from entering the connection position of the driving shaft 21 and the rotating part 42 and thus affecting the coaxiality, the cavity 11 is provided in the mounting frame 1, and the motor 2 and the coupling 5 are provided in the cavity 11, and the components in the cavity 11 are protected by the mounting frame 1.

[0044] According to some embodiments of the present invention, a circular hole 12 is provided on the mounting frame 1, the axis of the circular hole 12 coincides with the axis of the driving shaft 21, the rotating part 42 passes through the circular hole 12, and the fixed part 41 is arranged and connected to the end of the circular hole 12 away from the driving shaft 21. After the driving shaft 21 drives the rotating part 42 to rotate, the rotating part 42 needs to work on the outside, and the rotating part 42 needs to be fixedly connected to the coupling 5, so the rotating part 42 needs to pass through the circular hole 12, one end of the rotating part 42 is connected to the coupling 5 in the cavity 11, and the other end of the rotating part 42 is outside the cavity and works externally. The specific rotating shaft mechanism 4 can be a tool, and the end of the rotating part 42 outside the cavity 11 is the tool head of the tool.

[0045] If the coaxiality of the rotating cutter head is poor, it will bring a series of significant disadvantages, which not only affect the performance of the equipment, but also may cause safety hazards during use. Here are some of the main disadvantages: Reduced cutting accuracy: When the cutter head with poor coaxiality rotates, it is difficult for its cutting surface to maintain a constant distance and angle, resulting in deviations during the cutting process, affecting the accuracy and quality of the final product. Increased equipment vibration: Poor coaxiality of the cutter head will cause unnecessary vibration of the equipment during operation. This vibration not only affects the stability of the equipment, but may also cause wear or damage to other components and shorten the service life of the equipment. Increased energy consumption: Due to coaxiality problems, the cutter head may need to consume more energy to overcome the resistance caused by deviation when rotating. This not only increases operating costs, but may also have a negative impact on the performance of motor 2. Safety hazards: Cutters with poor coaxiality are more likely to lose control when rotating at high speeds, which may cause accidental injuries to operators or other surrounding objects. In addition, due to reduced cutting accuracy, there may also be safety hazards in the product. Increased maintenance costs: Equipment vibration and wear caused by coaxiality problems will accelerate the damage of the cutter head and other components, thereby increasing the maintenance frequency and cost of the equipment. In summary, if the coaxiality of the rotating cutter head is poor, it will have a negative impact on the performance, stability and safety of the equipment. Therefore, during production and use, the coaxiality of the cutter head should be strictly controlled to ensure the normal operation of the equipment and product quality.

[0046] According to some embodiments of the present invention, the positioning piece 3 includes a body and a boss 34 connected to the body, the first cone 31 is arranged on the body, the boss 34 is arranged in the circular hole 12, and there is a gap between the inner side of the circular hole 12 and the outer side of the boss 34. When the positioning piece 3 is connected to the mounting frame 1 by the bolt 6, the positioning piece 3 needs to be aligned with the mounting position on the mounting frame 1, so that the bolt 6 can pass through the hole on the positioning piece 3 and the hole on the mounting frame 1 at the same time, so that the positioning piece 3 can be more conveniently installed on the mounting frame 1. By setting the gap, the positioning piece 3 can be more conveniently matched with the circular hole through the boss 34. At the same time, since there is a certain gap between the inner side of the circular hole 12 and the outer side of the boss 34, the positioning piece 3 can be relatively displaced to a certain extent with the circular hole 12, and it is more convenient to adjust the coaxiality between the first cone 31 on the positioning piece 3 and the driving shaft 21.

[0047] According to some embodiments of the present invention, the radius of the through hole 35 formed on the inner side of the boss 34 is not less than the minimum radius of the first conical surface 31. That is, the inner side of the boss 34 is surrounded by a cylindrical through hole 35, and the cylindrical through hole 35 is coaxial with the first conical surface 31 during processing, so that the fixed part 41 and the rotating shaft mechanism 4 can pass through the through hole 35 when they are matched with the first conical surface 31. The radius of the through hole 35 is not less than the minimum radius of the first conical surface 31 to ensure that the first conical surface 31 and the second conical surface 411 are abutted. When the radius of the through hole 35 is less than the minimum radius of the first conical surface 31, it is possible that when the first conical surface 31 and the second conical surface 411 have not yet abutted, the side of the boss 34 facing the first conical surface 31 is convenient for the rotating shaft mechanism 4 to abut, so that the first conical surface 31 and the second conical surface 411 cannot form an abutment match, and the coaxiality between the driving shaft 21 and the rotating part 42 cannot be guaranteed.

[0048] According to some embodiments of the present invention, the gap between the inner side of the circular hole 12 and the outer side of the boss 34 does not exceed 2 mm. If the gap is too large, the position deviation of the positioning piece 3 during installation will be too large, making it inconvenient to fix the positioning piece 3 with the bolt 6.

[0049] According to some embodiments of the present invention, the angle between the first conical surface 31 and the axial direction of the rotating shaft does not exceed 30° and is not less than 10°. When the conical surface is used to ensure coaxiality, the influence of the conical surface angle is mainly reflected in the following aspects: First, the conical surface angle determines the shape and characteristics of the conical surface. The size of the conical surface angle directly affects the inclination and taper of the conical surface, and then affects the contact mode and sealing performance of the conical surface with adjacent components. A suitable conical surface angle can ensure good contact and sealing between the conical surface and adjacent components, thereby improving the ability to maintain coaxiality. Secondly, the conical surface angle has an important influence on the stability of coaxiality. The selection of the conical surface angle needs to take into account factors such as temperature changes in the working environment, vibration and wear of mechanical components. If the conical surface angle is too large or too small, the conical surface may be deformed or unstable in a high temperature or vibration environment, thereby affecting the maintenance of coaxiality. In addition, the conical surface angle will also affect the friction and wear between the conical surface and adjacent components. If the cone angle is designed to be too small, the cone may be subjected to excessive friction during operation, thereby accelerating wear. If the cone angle is designed to be too large, the cone may reduce its ability to maintain coaxiality. Therefore, the angle between the cone and the axis of the rotating shaft is limited to between 10° and 30°.

[0050] According to some embodiments of the present invention, the side of the positioning piece 3 facing away from the driving shaft 21 is the abutment surface 32, and when the abutment surface 32 abuts against the fixing portion 41, the first conical surface 31 fits with the second conical surface 411. When the positioning piece 3 is matched with the rotating shaft mechanism 4, not only the first conical surface 31 abuts with the second conical surface 411, but also the abutment surface 32 of the positioning piece 3 facing the driving shaft 21 also abuts with the fixing portion 41 on the rotating shaft mechanism 4, which can not only verify whether the connection between the first abutment surface 32 and the second abutment surface 32 is completely fitted, but also enhance the connection stiffness between the positioning piece 3 and the rotating shaft mechanism 4.

[0051] According to some embodiments of the present invention, a plurality of grooves 33 are provided on the abutting surface 32, and the grooves 33 correspond to the bolts 6 one by one, and the nuts of the bolts 6 are arranged in the grooves 33. This makes the structure more compact and isolates the nuts from the outside, thereby increasing the service life of the bolts 6.

[0052] According to the adjustment method of the machine tool spindle device of the second aspect embodiment of the present invention, it is realized by a machine tool spindle device of any one of the above embodiments, including: using bolts 6 to pre-connect the positioning piece 3 to the mounting frame 1. During pre-connection, the extrusion pressure between the positioning piece 3 and the mounting frame 1 does not exceed 500N. After pre-connection, it is necessary to apply external force to the positioning piece 3 so that the positioning piece 3 moves within the range of the gap between the positioning piece 3 and the bolt 6 to improve the coaxiality between the first cone surface 31 and the driving shaft 21. Therefore, if the extrusion pressure between the positioning piece 3 and the mounting frame 1 is large during pre-connection, it is necessary to apply a larger force to the positioning piece 3 when adjusting the coaxiality between the first cone surface 31 and the driving shaft 21, which is inconvenient to adjust the coaxiality. Therefore, the extrusion pressure between the positioning piece 3 and the mounting frame 1 does not exceed 500N. Use a measuring device to measure the coaxiality between the first cone surface 31 and the driving shaft 21; adjust the coaxiality between the first cone surface 31 and the driving shaft 21 through the gap between the bolt 6 and the mounting frame 1; use the bolt 6 to connect the positioning piece 3 to the mounting frame 1, and continue to tighten the bolt 6 during the connection, so that the extrusion force between the positioning piece 3 and the mounting frame 1 increases, and the specific extrusion force between the positioning piece 3 and the mounting frame 1 is not less than 600N. In the application, the rotating part 42 needs to be rotated quickly, which may cause eccentric force to the positioning piece 3, and the rotating shaft mechanism 4 also needs to be disassembled more frequently, which will cause impact force to the positioning piece 3 during disassembly. If the extrusion force between the positioning piece 3 and the mounting frame 1 is not enough, the coaxiality between the first cone surface 31 and the driving shaft 21 will be reduced in the application or after the rotating shaft mechanism 4 is disassembled, thereby reducing the coaxiality between the driving shaft 21 and the rotating part 42. Therefore, the extrusion force between the positioning piece 3 and the mounting frame 1 is required to be not less than 600N. It should be noted that when bolts 6 are used for connection, there will be a certain gap between bolts 6 and the positioning piece 3 and mounting frame 1. When bolts 6 are not fully tightened, the positioning piece 3 can move within this gap to a certain extent, and adjust the coaxiality between the first cone surface 31 and the driving shaft 21 within this moving range. When a higher coaxiality is obtained, bolts 6 are tightened again to fix the positioning piece 3 and mounting frame 1 more firmly. Furthermore, when bolts 6 are used to pre-connect the positioning piece 3 and mounting frame 1, the extrusion force between the positioning piece 3 and mounting frame 1 is not less than 50N. This is to avoid insufficient tightening force between the positioning piece 3 and mounting frame 1 after pre-connection, thereby failing to maintain the coaxiality between the first cone surface 31 and the driving shaft 21.

[0053] In the description of the present invention, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

Claims

1. A machine tool spindle device, characterized in that: include: A mounting frame, wherein a circular hole is formed on the mounting frame; A motor, wherein the motor is fixedly mounted on the mounting frame; A positioning piece, wherein the positioning piece is connected to the mounting frame by bolts, a first conical surface is arranged on the positioning piece, the first conical surface is coaxial with the driving shaft of the motor, the radius of the first conical surface gradually decreases from an end away from the motor to an end close to the motor, the positioning piece comprises a body and a boss connected to the body, the first conical surface is arranged on the body, the boss is arranged in the circular hole, and there is a gap between the inner side surface of the circular hole and the outer side surface of the boss; A rotating shaft mechanism, wherein the positioning piece is sleeved on the rotating shaft mechanism, the rotating shaft mechanism comprises a fixed part and a rotating part, the rotating part is rotatably connected to the fixed part, a second conical surface is provided on the fixed part, and the second conical surface is abutted and matched with the first conical surface, so that the rotating part and the driving shaft are coaxial; A coupling, the coupling includes a first part and a second part, the first part is connected to the driving shaft, and the second part is connected to the rotating part, so that the driving shaft is fixedly connected to the rotating part, the rotating part passes through the circular hole, and the fixed part is arranged to be connected to one end of the circular hole away from the driving shaft.

2. A machine tool spindle device according to claim 1, characterized in that: The radius of the through hole formed on the inner side surface of the boss is not less than the minimum radius of the first conical surface on the body.

3. A machine tool spindle device according to claim 1, characterized in that: The gap between the inner side surface of the circular hole and the outer side surface of the boss does not exceed 2 mm.

4. A machine tool spindle device according to claim 1, characterized in that: An angle between the first conical surface and the axial direction of the rotation axis is not more than 30° and not less than 10°.

5. A machine tool spindle device according to claim 1, characterized in that: The side of the positioning piece facing away from the driving shaft is a contact surface. When the contact surface contacts the fixing portion, the first conical surface fits with the second conical surface.

6. A machine tool spindle device according to claim 5, characterized in that: The abutting surface is provided with a plurality of grooves, the grooves corresponding to the bolts one by one, and the nuts of the bolts are arranged in the grooves.

7. A method for adjusting a machine tool spindle, characterized in that: For adjusting the machine tool spindle device according to any one of claims 1 to 6, the adjustment method of the machine tool spindle comprises: The positioning piece is pre-connected to the mounting frame using bolts, and when pre-connected, the extrusion force between the positioning piece and the mounting frame does not exceed 500N; Using a measuring device to measure the coaxiality between the first conical surface and the driving shaft; The coaxiality between the first cone surface and the driving shaft is adjusted by the gap between the bolt and the mounting frame; After the coaxiality between the first conical surface and the driving shaft is adjusted, the force is continued to be applied to the bolt to increase the squeezing force between the positioning piece and the mounting frame.

8. The method for adjusting a machine tool spindle according to claim 7, characterized in that: During pre-connection, the extrusion force between the positioning piece and the mounting frame is not less than 50N.

9. The method for adjusting a machine tool spindle according to claim 7, characterized in that: After the coaxiality between the first conical surface and the driving shaft is adjusted, the force is continued to be applied to the bolt so that the extrusion force between the positioning piece and the mounting frame is not less than 600N.

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