Metal cutting machine tool with multi-channel spindle cooling mechanism

Abstract

The application relates to a metal cutting machine tool with a multi-channel spindle cooling mechanism, which comprises a rack, a spindle shell arranged on the rack, a motor stator arranged on the inner side of the spindle shell, a mandrel rotatably arranged in the spindle shell, a motor rotor arranged on the outer side of the mandrel and matched with the motor stator, a cooling jacket fixedly arranged on the mandrel, the cooling jacket being arranged on the inner side of the motor rotor, the cooling jacket being provided with cooling channels, a liquid inlet channel and a liquid outlet channel, the cooling channels being annular, a plurality of the cooling channels being arranged along the axis of the mandrel, the plurality of the cooling channels being not communicated with each other, the liquid inlet channel being communicated with the cooling channels, the liquid outlet channel being communicated with the cooling channels, an inlet and outlet sleeve arranged on the mandrel, the inlet and outlet sleeve being connected with the spindle shell, the inlet and outlet sleeve being provided with a liquid inlet channel and a liquid outlet channel, the liquid inlet channel being communicated with the liquid inlet channel, and the liquid outlet channel being communicated with the liquid outlet channel. The application has the effect that the mandrel located in the area of the motor stator and the rotor can be more uniformly cooled.

Description

Technical Field

[0001] This application relates to the field of machining centers, and in particular to a metal cutting machine tool with a multi-channel spindle cooling mechanism. Background Technology

[0002] With the rise and continuous maturation of advanced manufacturing technologies, higher requirements have been placed on CNC machining technology and machine tool structures. As technology advances, mechanical products are becoming increasingly precise and complex. Ordinary machine tools or highly specialized automated machine tools can no longer meet these requirements for machining these products. Machining centers, a new type of machine tool, have emerged. Machining centers have advantages such as strong adaptability, high machining accuracy, stable machining quality, and high production efficiency, and therefore their application is becoming increasingly widespread. The electric spindle is one of the core components of a machining center. The electric spindle is a relatively independent component from the machine tool's transmission system and overall structure, and it can autonomously realize the functions of the machine tool spindle and spindle motor.

[0003] In related technologies, such as CN215199673U, a machining center electric spindle has a motor rotor mounted on a spindle; a housing mounted on the motor stator and covering the spindle; a sealing module on both sides of the housing; a bearing mounted on the end of the spindle; and a cooling module mounted on the housing for cooling the motor. The cooling module includes a spiral sealing sleeve and a spiral cooling channel. The spiral sealing sleeve is mounted on the surface of the housing, and the spiral cooling channel is located between the housing and the spiral sealing sleeve. The spiral sealing sleeve and the housing together form the spiral cooling channel, through which cooling water can circulate, thereby removing the heat generated by the electric spindle and continuously cooling the electric spindle.

[0004] Regarding the aforementioned technologies, there is a defect that, during the operation of the electric spindle, the heat mainly comes from between the stator and rotor of the motor, while the cooling water moves along the axis of the spindle in the spiral cooling channel. As a result, the temperature of the cooling water entering the channel is lower than the temperature of the cooling water leaving the channel. Therefore, the cooling of the spindle in the area where the motor stator and rotor are located will be uneven, resulting in lower machining accuracy. Summary of the Invention

[0005] In order to achieve more uniform cooling of the area where the spindle is located between the motor stator and rotor, this application provides a metal cutting machine tool with a multi-channel spindle cooling mechanism.

[0006] The metal cutting machine tool with a multi-channel spindle cooling mechanism provided in this application adopts the following technical solution:

[0007] A metal cutting machine tool with a multi-channel spindle cooling mechanism, comprising:

[0008] frame;

[0009] A spindle housing is mounted on the frame, and a motor stator is mounted on the inner side of the spindle housing.

[0010] A spindle rotatably passes through the main shaft housing, and a motor rotor that cooperates with the motor stator is provided on the outer side of the spindle;

[0011] A cooling jacket is fixedly fitted on the spindle and located inside the motor rotor. The cooling jacket is provided with a cooling channel, a liquid inlet channel, and a liquid outlet channel. The cooling channel is annular and has multiple channels distributed along the axis of the spindle. The multiple cooling channels are not interconnected. The liquid inlet channel is connected to the cooling channel, and the liquid outlet channel is connected to the cooling channel.

[0012] An inlet / outlet sleeve is fitted onto the mandrel and is connected to the main shaft housing. The inlet / outlet sleeve is provided with a liquid inlet channel and a liquid outlet channel. The liquid inlet channel is connected to the liquid inlet channel, and the liquid outlet channel is connected to the liquid outlet channel.

[0013] By adopting the above technical solution, since the cooling channel is annular and the multiple cooling channels are not interconnected, coolant at the same temperature can be used to cool different positions along the axis of the mandrel through multiple cooling channels. Therefore, the difference in cooling effect between different positions along the axis of the mandrel will not be too large, thus enabling uniform cooling of the mandrel and improving machining accuracy.

[0014] Preferably, the end of the liquid inlet channel away from the cooling channel is connected to the end face of the cooling jacket, and the end of the liquid outlet channel away from the cooling channel is connected to the end face of the cooling jacket.

[0015] By adopting the above technical solution, compared with the method where the inlet and outlet channels are connected to the peripheral surface of the cooling jacket at the ends away from the cooling channel, this design has the following advantages: First, the inlet and outlet channels do not need to be specially constructed to extend between the motor rotor and the cooling jacket, thus maintaining the simplicity of the overall spindle structure; Second, the inlet and outlet channels have sections parallel to the spindle axis, and the coolant in these sections can limit the heat from the motor rotor and stator to be transferred inward to the spindle, thus providing better cooling for the spindle.

[0016] Preferably, the inlet ports of the different liquid inlet channels connecting to the end face of the cooling jacket are located at different positions on the shaft diameter of the cooling jacket, and the outlet ports of the different liquid outlet channels connecting to the end face of the cooling jacket are located at different positions on the shaft diameter of the cooling jacket.

[0017] By adopting the above technical solution, multiple liquid inlet channels and multiple liquid outlet channels can form a multi-layer heat-resistant structure along the axis of the mandrel, thus providing better heat dissipation for the mandrel.

[0018] Preferably, there are two inlet / outlet sleeves symmetrically arranged relative to the cooling sleeve, one of which corresponds to the liquid inlet channel and the other corresponds to the liquid outlet channel.

[0019] By adopting the above technical solution, compared with the method of having only one inlet and outlet sleeve, this design has two advantages: First, because the cooling sleeve rotates relative to the inlet and outlet sleeve, the cooling sleeve does not need to have a structure to prevent the liquid inlet channel, liquid outlet channel, liquid inlet channel, and liquid outlet channel from being connected in a disordered manner; Second, it can ensure that the number of liquid inlet channels and liquid outlet channels is consistent at different positions of the mandrel axis, so that different positions of the mandrel axis can be cooled evenly.

[0020] Preferably, a connecting liquid tank is provided on the end face of the inlet / outlet sleeve near the cooling sleeve. The connecting liquid tank has an annular structure. The opening of the connecting liquid tank connects to the liquid inlet channel or the liquid outlet channel, and the bottom of the connecting liquid tank connects to the liquid inlet channel or the liquid outlet channel. The end of the liquid inlet channel and the liquid outlet channel away from the connecting liquid tank connects to the end face of the inlet / outlet sleeve away from the cooling sleeve. Multiple liquid inlet channels and liquid outlet channels are distributed around the central circumference of the inlet / outlet sleeve.

[0021] By adopting the above technical solution, due to the setting of the connected liquid tank, the liquid inlet channel can be stably connected to the liquid inlet channel and the liquid outlet channel can be stably connected to the liquid outlet channel during the rotation of the cooling jacket. Therefore, the coolant in the cooling channel is more sufficient to improve the cooling effect. At the same time, this connection structure is simpler.

[0022] Preferably, one cooling channel corresponds to multiple liquid inlet channels and multiple liquid outlet channels, and the liquid inlet channels and the liquid outlet channels are symmetrically distributed with respect to the axis of the cooling jacket.

[0023] By adopting the above technical solution, compared with the setting of one cooling channel corresponding to one inlet channel and one outlet channel, this design allows the coolant to quickly enter the cooling channel from multiple inlet channels and quickly leave the cooling channel from multiple outlet channels. Therefore, the flow rate of the coolant is faster, which reduces the weakening effect of the coolant temperature rise on the spindle cooling effect, thereby improving the cooling effect on the spindle.

[0024] Preferably, the spindle housing is provided with an evaporator coil at the location of the motor stator; the frame is provided with a condenser, which is connected to the evaporator coil and the inlet / outlet sleeve respectively.

[0025] By adopting the above technical solution, the coolant will change from liquid to gas when passing through the evaporator coil. During this process, the evaporator coil will absorb heat, so the heat generated between the motor rotor and the motor stator can be absorbed from the outside of the spindle housing. The condenser then changes the coolant from gas to liquid.

[0026] Preferably, the outer side of the main shaft housing is covered with a heat insulation box, the heat insulation box is provided for the evaporator coil, the heat insulation box is provided with a heat exhaust window, a heat exhaust fan is provided at the heat exhaust window, and the condenser is located outside the heat insulation box.

[0027] By adopting the above technical solution, the cooling jacket restricts the transfer of heat inward to the spindle, the evaporator coil attracts heat and moves it away from the spindle, and the exhaust fan quickly removes the heat, thereby achieving the purpose of efficient heat dissipation.

[0028] Preferably, an auxiliary heat-conducting sleeve is fitted onto the spindle at a position not corresponding to the motor stator. The auxiliary heat-conducting sleeve is connected to the spindle housing, and the auxiliary heat-conducting sleeve allows the coolant to flow away from the motor rotor.

[0029] By adopting the above technical solution, since the bearing will also generate heat during the rotation of the spindle, the auxiliary heat-conducting sleeve can prevent heat from other places from being transferred to the area where the motor rotor is located, so that the heat of the spindle will not be excessive, thereby improving the cooling effect of the spindle.

[0030] In summary, this application includes at least one of the following beneficial technical effects:

[0031] 1. Because the cooling channels are annular and not interconnected, coolant at the same temperature can pass through multiple cooling channels to cool different positions along the spindle axis. Therefore, the cooling effect at different positions along the spindle axis will not be too different, thus enabling uniform cooling of the spindle and improving machining accuracy.

[0032] 2. The cooling jacket restricts the transfer of heat inward to the spindle, the evaporator coil attracts heat and moves it away from the spindle, and the exhaust fan quickly removes the heat, thus achieving efficient heat dissipation. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the spindle cooling mechanism in the embodiments of this application.

[0034] Figure 2 This is a cross-sectional schematic diagram of the spindle cooling mechanism in the embodiments of this application.

[0035] Figure 3 This is a schematic diagram illustrating the flow path of the coolant in the embodiments of this application.

[0036] Figure 4 This is a schematic diagram illustrating the specific structure of the cooling jacket in the embodiments of this application.

[0037] Explanation of reference numerals in the attached drawings: 1. Frame; 2. Main spindle housing; 21. Motor stator; 3. Spindle; 31. Motor rotor; 4. Cooling jacket; 41. Cooling channel; 42. Liquid inlet channel; 43. Liquid outlet channel; 5. Inlet / outlet sleeve; 51. Liquid inlet channel; 52. Liquid outlet channel; 53. Connecting liquid tank; 6. Evaporator coil; 7. Condenser; 8. Insulated enclosure; 81. Exhaust window; 82. Exhaust fan; 9. Auxiliary heat-conducting jacket. Detailed Implementation

[0038] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0039] This application discloses a metal cutting machine tool with a multi-channel spindle cooling mechanism.

[0040] Reference Figures 1 to 3 A metal cutting machine tool with a multi-channel spindle cooling mechanism includes a frame 1, a spindle housing 2, a spindle 3, a cooling sleeve 4, and an inlet / outlet sleeve 5. The spindle housing 2 is fixedly mounted on the frame 1, and a motor stator 21 is arranged inside the spindle housing 2. The spindle 3 rotatably passes through the spindle housing 2, and a motor rotor 31 that mates with the motor stator 21 is arranged outside the spindle 3. The cooling sleeve 4 is coaxially fixedly sleeved on the spindle 3, and is located inside the motor rotor 31. The cooling sleeve 4 is formed with a cooling channel 41, a liquid inlet channel 42, and a liquid outlet channel 43. The cooling channel 41 is annular and coaxially arranged with the spindle 3. Multiple cooling channels 41 are distributed along the axis of the spindle 3. The multiple cooling channels 41 are not interconnected. The liquid inlet channel 42 is connected to the cooling channel 41, and the liquid outlet channel 43 is connected to the cooling channel 41. The inlet and outlet sleeve 5 is coaxially sleeved on the spindle 3 and is fixedly connected to the spindle housing 2. The inlet and outlet sleeve 5 has a liquid inlet channel 51 and a liquid outlet channel 52. The liquid inlet channel 51 is connected to the liquid inlet channel 42, and the liquid outlet channel 52 is connected to the liquid outlet channel 43.

[0041] Reference Figures 1 to 3The cooling working principle is as follows: each cooling channel 41 is annular, and multiple cooling channels 41 are not interconnected. Therefore, coolant of the same temperature can pass through multiple cooling channels 41 to cool different positions along the axis of the spindle 3. The cooling effect difference between different positions along the axis of the spindle 3 will not be too large, so the spindle 3 can be cooled evenly, thereby improving the machining accuracy. In this embodiment, the formation of the cooling channel 41 is the key to the technical effect that this application wants to achieve. Therefore, an annular groove is opened on the inner side of the cooling sleeve 4. The annular groove is coaxially set with the spindle 3 to form the cooling channel 41. The bottom of the cooling channel 41 is connected to the liquid inlet channel 42 or the liquid outlet channel 43, so as to maintain the simplicity of the spindle structure.

[0042] Reference Figure 2 and Figure 3 To further limit the heat transfer from the cooling jacket 4 to the spindle 3, the following configuration is provided: First, the end of the liquid inlet channel 42 away from the cooling channel 41 is connected to the end face of the cooling jacket 4, and the end of the liquid outlet channel 43 away from the cooling channel 41 is connected to the end face of the cooling jacket 4. Therefore, both the liquid inlet channel 42 and the liquid outlet channel 43 have a section parallel to the axis of the spindle 3. The coolant in this section can better limit the heat transfer from the cooling jacket to the spindle 3. At the same time, this structure also allows the inlet and outlet sleeves 5 to communicate and cooperate with the cooling jacket 4 without having to extend into the inside of the motor rotor 31, thus making the structure of the spindle simpler.

[0043] Reference Figure 2 and Figure 3 Secondly, the openings of the different liquid inlet channels 42 connecting to the end face of the cooling jacket 4 are located at different positions on the shaft diameter of the cooling jacket 4, and the openings of the different liquid outlet channels 43 connecting to the end face of the cooling jacket 4 are located at different positions on the shaft diameter of the cooling jacket 4. Here, "different" refers to the liquid inlet channels 42 and liquid outlet channels 43 connected to the different cooling channels 41. The parts of the different liquid inlet channels 42 parallel to the axis of the spindle 3 are located at different positions on the shaft diameter of the cooling jacket 4, so a multi-layer heat-insulating structure can be formed, which can better cool the spindle 3. At the same time, this structure can also better prevent interference between the different cooling channels 41 and maintain the structural strength of the cooling jacket 4.

[0044] Reference Figure 2 and Figure 3Thirdly, each cooling jacket 4 is paired with two inlet / outlet jackets 5, which are symmetrically arranged relative to the cooling jacket 4. Therefore, the two inlet / outlet jackets 5 are located at both ends of the cooling jacket 4 along its axial direction. One inlet / outlet jacket 5 is configured as the liquid inlet channel 51, and the other inlet / outlet jacket 5 is configured as the liquid outlet channel 52. The advantage of this is that, for example, in the part of the cooling jacket 4 near the right inlet / outlet jacket 5, heat will penetrate through the three liquid inlet channels 42 and one liquid outlet channel 43, while in the part of the cooling jacket 4 near the left inlet / outlet jacket 5, heat will penetrate through one liquid inlet channel 42 and three liquid outlet channels 43. Thus, it can evenly cool different positions along the axial direction of the spindle 3. In addition, because there are two inlet / outlet jackets 5, the liquid inlet channel 51, the liquid outlet channel, the liquid inlet channel 42, and the liquid outlet channel 43 can also be connected in a simple way to prevent confusion.

[0045] Reference Figure 2 and Figure 3 Fourth, a connecting liquid reservoir 53 is provided on the end face of the inlet / outlet sleeve 5 near the cooling sleeve 4. The connecting liquid reservoir 53 has an annular structure. The opening of the connecting liquid reservoir 53 is connected to the liquid inlet channel 42 or the liquid outlet channel 43. The bottom of the connecting liquid reservoir 53 is connected to the liquid inlet channel 51 or the liquid outlet channel 52. At the same time, the end of the liquid inlet channel 51 and the liquid outlet channel 52 away from the connecting liquid reservoir 53 is connected to the end face of the inlet / outlet sleeve 5 away from the cooling sleeve 4. Multiple liquid inlet channels 51 and liquid outlet channels 52 are distributed around the central circumference of the inlet / outlet sleeve 5. During the rotation of the cooling sleeve 4, the liquid inlet channel 51 can be stably connected to the liquid inlet channel 42, and the liquid outlet channel 52 can be stably connected to the liquid outlet channel 43. Therefore, the coolant in the cooling channel 41 is more sufficient to improve the cooling effect. In addition, this connecting structure is also simpler.

[0046] Reference Figures 2 to 4 Fifth, one cooling channel 41 corresponds to multiple liquid inlet channels 42 and multiple liquid outlet channels 43. The liquid inlet channels 42 and the liquid outlet channels 43 are symmetrically distributed with respect to the axis of the cooling jacket 4. Thus, the coolant can quickly enter the cooling channel 41 from the multiple liquid inlet channels 42 and quickly leave the cooling channel 41 from the multiple liquid outlet channels 43. Therefore, the flow rate of the coolant is faster, so as to reduce the rate of increase of the coolant temperature and thus improve the cooling effect on the spindle 3.

[0047] Reference Figures 1 to 3In order to better dissipate heat from the spindle 3, the heat between the motor stator 21 and the motor rotor 31 can be attracted to diffuse outward. Specifically, the spindle housing 2 is equipped with an evaporator coil 6 at the location of the motor stator 21, and the frame 1 is equipped with a condenser 7. The condenser 7 is connected to the evaporator coil 6 and the inlet / outlet sleeve 5. After the coolant leaves the cooling sleeve 4, it will flow into the evaporator coil 6. After entering the evaporator coil 6, the coolant changes from a liquid state to a gas state. During this process, the coolant will absorb heat from the external environment, so it can attract heat to diffuse outward. Subsequently, the condenser 7 will change the coolant from a gas state back to a liquid state so that the coolant can be injected back into the cooling sleeve 4.

[0048] Reference Figure 1 and Figure 2 To facilitate the removal of heat, the following configuration is provided: a heat insulation box 8 is provided to cover the outside of the spindle housing 2. The heat insulation box 8 prevents external heat from being transferred in. The heat insulation box 8 houses the evaporator coil 6. The heat insulation box 8 has a heat exhaust window 81, and a heat exhaust fan 82 is provided at the heat exhaust window 81. The condenser 7 is located outside the heat insulation box 8. Therefore, the cooling jacket 4 restricts the heat from being transferred inward to the spindle 3. The evaporator coil 6 absorbs heat, and the heat exhaust fan 82 quickly dissipates the heat, thereby achieving efficient heat dissipation.

[0049] Reference Figure 1 and Figure 2 Because during the rotation of the spindle 3, not only the motor rotor 31 and the motor stator 21 generate heat, but the bearings also generate heat. Therefore, in order to better cool the spindle 3, it is desirable that the heat generated in different areas does not concentrate together. Accordingly, the following settings are made: an auxiliary heat-conducting sleeve 9 is fitted on the spindle 3 at a position not corresponding to the motor stator 21. The auxiliary heat-conducting sleeve 9 is fixedly connected to the spindle housing 2. The auxiliary heat-conducting sleeve 9 also has a channel inside for coolant to be injected, but the coolant flows in a direction away from the motor rotor 31. This prevents heat from other places from being transferred to the area where the motor rotor 31 is located, thereby preventing the spindle 3 from overheating and improving the cooling effect of the spindle 3.

[0050] The implementation principle of a metal cutting machine tool with a multi-channel spindle cooling mechanism in this application embodiment is as follows: each cooling channel 41 is annular and the multiple cooling channels 41 are not interconnected. Therefore, coolant of the same temperature can be cooled at different positions along the axis of the spindle 3 through multiple cooling channels 41. The cooling effect at different positions along the axis of the spindle 3 will not be too large, thereby uniformly cooling the spindle 3 and improving machining accuracy.

[0051] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A metal cutting machine tool with a multi-channel spindle cooling mechanism, characterized in that: include: Rack (1); A spindle housing (2) is mounted on the frame (1), and a motor stator (21) is mounted on the inner side of the spindle housing (2). The spindle (3) rotatably passes through the main shaft housing (2), and a motor rotor (31) that cooperates with the motor stator (21) is provided on the outside of the spindle (3); A cooling sleeve (4) is fixedly sleeved on the spindle (3). The cooling sleeve (4) is located inside the motor rotor (31). The cooling sleeve (4) is provided with a cooling channel (41), a liquid inlet channel (42), and a liquid outlet channel (43). The cooling channel (41) is annular. Multiple cooling channels (41) are distributed along the axis of the spindle (3). The multiple cooling channels (41) are not interconnected. The liquid inlet channel (42) is connected to the cooling channel (41), and the liquid outlet channel (43) is connected to the cooling channel (41). An inlet / outlet sleeve (5) is fitted onto the spindle (3). The inlet / outlet sleeve (5) is connected to the main shaft housing (2). The inlet / outlet sleeve (5) is provided with an inlet channel (51) and an outlet channel (52). The inlet channel (51) is connected to the inlet channel (42), and the outlet channel (52) is connected to the outlet channel (43).

2. The metal cutting machine tool with a multi-channel spindle cooling mechanism according to claim 1, characterized in that: The end of the liquid inlet channel (42) away from the cooling channel (41) is connected to the end face of the cooling jacket (4), and the end of the liquid outlet channel (43) away from the cooling channel (41) is connected to the end face of the cooling jacket (4).

3. The metal cutting machine tool with a multi-channel spindle cooling mechanism according to claim 2, characterized in that: The inlet ports of the different liquid inlet channels (42) that connect to the end face of the cooling sleeve (4) are located at different positions on the shaft diameter of the cooling sleeve (4), and the outlet ports of the different liquid outlet channels (43) that connect to the end face of the cooling sleeve (4) are located at different positions on the shaft diameter of the cooling sleeve (4).

4. The metal cutting machine tool with a multi-channel spindle cooling mechanism according to claim 3, characterized in that: Two inlet / outlet sleeves (5) are symmetrically arranged relative to the cooling sleeve (4), one of which has a liquid inlet channel (51) and the other has a liquid outlet channel (52).

5. The metal cutting machine tool with a multi-channel spindle cooling mechanism according to claim 4, characterized in that: A connecting liquid tank (53) is provided on the end face of the inlet / outlet sleeve (5) near the cooling sleeve (4). The connecting liquid tank (53) has an annular groove structure. The opening of the connecting liquid tank (53) is connected to the liquid inlet channel (42) or the liquid outlet channel (43). The bottom of the connecting liquid tank (53) is connected to the liquid inlet channel (51) or the liquid outlet channel (52). The end of the liquid inlet channel (51) and the liquid outlet channel (52) away from the connecting liquid tank (53) is connected to the end face of the inlet / outlet sleeve (5) away from the cooling sleeve (4). Multiple liquid inlet channels (51) and liquid outlet channels (52) are distributed around the central circumference of the inlet / outlet sleeve (5).

6. The metal cutting machine tool with a multi-channel spindle cooling mechanism according to claim 5, characterized in that: One cooling channel (41) corresponds to multiple liquid inlet channels (42) and multiple liquid outlet channels (43), and the liquid inlet channels (42) and the liquid outlet channels (43) are symmetrically distributed with respect to the axis of the cooling jacket (4).

7. The metal cutting machine tool with a multi-channel spindle cooling mechanism according to claim 1, characterized in that: The main shaft housing (2) is provided with an evaporator coil (6) at the location of the motor stator (21); the frame (1) is provided with a condenser (7), which is connected to the evaporator coil (6) and the inlet / outlet sleeve (5).

8. The metal cutting machine tool with a multi-channel spindle cooling mechanism according to claim 7, characterized in that: The outer side of the main shaft housing (2) is covered by a heat insulation box (8), which is provided for the evaporator coil (6). The heat insulation box (8) is provided with a heat exhaust window (81), and a heat exhaust fan (82) is provided at the heat exhaust window (81). The condenser (7) is located outside the heat insulation box (8).

9. The metal cutting machine tool with a multi-channel spindle cooling mechanism according to claim 1, characterized in that: The spindle (3) is fitted with an auxiliary heat-conducting sleeve (9) at a position not corresponding to the motor stator (21). The auxiliary heat-conducting sleeve (9) is connected to the main shaft housing (2). The auxiliary heat-conducting sleeve (9) provides the coolant to flow away from the motor rotor (31).

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