Electric spindle convenient for heat dissipation

Abstract

The application discloses a motorized spindle convenient for heat dissipation, which comprises a spindle shell, a front end cover, a tail end cover, a shaft rod and a mandrel, the front end cover is fixedly installed at the front end of the spindle shell, the tail end cover is fixedly installed at the tail end of the spindle shell, the inside of the spindle shell is provided with an accommodating cavity, the mandrel is rotationally arranged in the inside of the accommodating cavity, the outer peripheral wall of the mandrel is in close fit with the cavity wall of the accommodating cavity, and the inside of the mandrel is provided with an installation cavity for installing the shaft rod. The application relates to the field of motorized spindles. The motorized spindle convenient for heat dissipation is characterized in that the shaft rod drives the push flow turbine to rotate in the process of rotation, so that the cooling oil in the tail end cover is pushed to flow by the push flow turbine, the cooling oil flows in the oil liquid discharge pipe, the heat dissipation pipe, the communication pipe, the flow guide pipe, the oil liquid inlet pipe and the inner cavity of the tail end cover under the influence of the push flow turbine to form an oil liquid circulation loop, and then the heat is discharged through the flowing oil liquid, so that the purpose of cooling and heat dissipation is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electric spindle, in particular to an electric spindle facilitating heat dissipation. BACKGROUND

[0002] Electric spindle is the core component of high-speed machining machine tool, electric spindle is a new technology in the field of numerical control machine tool, which integrates the spindle and the spindle motor into one, together with linear motor technology and high-speed tool technology, the rotor of the motor directly serves as the spindle of the machine tool, and the housing of the spindle unit is the motor base, which, together with other components, realizes the integration of the motor and the spindle of the machine tool.

[0003] However, since the electric spindle integrates the motor in the spindle unit, the bearings, rotors and other internal components will generate friction during high-speed operation, resulting in heat rise, and the current passing through the winding will generate a certain resistance loss, which will also increase the temperature inside the electric spindle, easily increasing the loss of the electric spindle itself, resulting in a serious reduction in the service life of the electric spindle.

[0004] Therefore, the skilled person in the art provides an electric spindle facilitating heat dissipation to solve the problems raised in the background art. SUMMARY

[0005] The purpose of the present application is to provide an electric spindle facilitating heat dissipation to solve the problems raised in the background art.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0007] The above technical purpose of the present application is achieved by the following technical scheme:

[0008] An electric spindle facilitating heat dissipation, comprising a spindle housing, a front end cover, a tail end cover, a shaft rod and a mandrel, the front end cover is fixedly installed at the front end of the spindle housing, and the tail end cover is fixedly installed at the tail end of the spindle housing;

[0009] The interior of the spindle housing is provided with a containing cavity, the mandrel is rotatably arranged in the interior of the containing cavity, the outer peripheral wall of the mandrel is in close contact with the cavity wall of the containing cavity, and the interior of the mandrel is provided with a mounting cavity for mounting the shaft rod, the shell wall of the spindle housing is provided with a heat dissipation pipe, the cavity wall of the containing cavity is provided with a flow guide pipe at a position corresponding to the heat dissipation pipe, and the tail end of the spindle housing is provided with a separation plate, and the interior of the separation plate is provided with a tail end rotating structure;

[0010] The interior of the cover body of the front end cover is provided with a communication pipe, the communication pipe is arranged in a U shape, the interior of the front end cover is provided with a front end positioning hole for positioning the shaft rod, and the interior of the front end positioning hole is provided with a front end rotating structure;

[0011] The cover body of the tail end cover is internally provided with an oil inlet pipe and an oil outlet pipe, the position of the oil inlet pipe corresponds to the position of the flow guide pipe, the position of the oil outlet pipe corresponds to the position of the heat dissipation pipe, and the tail end cover is provided with a cooling cylinder at the end away from the main shaft shell.

[0012] One end of the cooling cylinder is provided with a shunt pipe inserted into the tail end cover, the outer peripheral wall of the shunt pipe is provided with a baffle between the oil inlet pipe and the oil outlet pipe, the inside of the shunt pipe is provided with a push flow turbine, and the inside of the push flow turbine is provided with a fixed shaft fixedly connected with the shaft rod.

[0013] Further, the inside of the cooling cylinder is provided with a separation cavity, the inside of the separation cavity is provided with a motor controller, and one end of the motor controller is provided with an external lead wire penetrating through the separation cavity and the cooling cylinder.

[0014] Further, the two ends of the flow guide pipe and the heat dissipation pipe are both provided with sealing rings.

[0015] Further, the two ends of the communication pipe are both provided with extension openings, and the two ends of the communication pipe correspond to the positions of the heat dissipation pipe and the flow guide pipe respectively.

[0016] Further, the front end rotating structure comprises a shaft sleeve, a first front end bearing, a second front end bearing and a front end oil seal, the shaft sleeve is sleeved on the outer peripheral wall of the shaft rod and corresponds to the front end cover, the outer peripheral wall of the shaft sleeve is fixedly provided with a positioning ring, the first front end bearing and the second front end bearing are both sleeved on the outer peripheral wall of the shaft sleeve and are located on the two sides of the positioning ring respectively, the second front end bearing is close to the mandrel, and the side of the first front end bearing and the second front end bearing away from each other is provided with a front end bearing oil seal.

[0017] Further, the tail end rotating structure comprises a first tail end bearing, a second tail end bearing and a sunken groove, the sunken groove is opened on the outer peripheral wall of the shaft rod and corresponds to the position of the separation plate, the first tail end bearing and the second tail end bearing are both sleeved at the sunken groove of the shaft rod, and the side of the first tail end bearing close to the mandrel is provided with a tail end bearing oil seal.

[0018] Further, there is a gap between the end of the shunt pipe close to the separation plate and the separation plate, and the outer peripheral wall of the end of the shunt pipe away from the separation plate is provided with a plurality of shunt holes arranged in a ring array.

[0019] Further, the outer peripheral wall of the main shaft shell is fixedly provided with a cooling jacket, both ends of the cooling jacket are provided with fixed plates, the two fixed plates are fixedly connected with the outer peripheral walls of the front end cover and the tail end cover respectively, the inside of the fixed plate is provided with a plurality of shell bolts, the inner wall of the cooling jacket is provided with a plurality of cooling fins, and the cooling fins are mutually attached to the surface of the main shaft shell.

[0020] In summary, the present application has at least one of the following beneficial technical effects:

[0021] 1. The electric spindle convenient for heat dissipation, the shaft rod rotates to drive the push flow turbine to rotate in the rotation process, so as to drive the cooling oil in the tail end cover to flow, and the cooling oil flows in the oil liquid discharge pipe, the heat dissipation pipe, the communication pipe, the flow guide pipe, the oil liquid inlet pipe and the inner cavity of the tail end cover under the influence of the push flow turbine to form an oil liquid circulation loop, and then the heat is discharged through the flowing oil liquid, so as to achieve the purpose of cooling and heat dissipation.

[0022] 2. The electric spindle convenient for heat dissipation, each oil liquid loop is communicated with the inner cavity of the tail end cover, and the same push flow turbine provides power for the oil liquid, so that the oil pressure in each oil liquid loop is equal, and at this time the pressure of the cooling oil on the outer wall of the mandrel is the same, so that the oil liquid can uniformly adhere to the outer wall of the mandrel in the process of rotating the mandrel, so that the stability of the mandrel is improved, and the friction between the mandrel and the cavity wall is reduced, so that the possibility of friction heat generation of the mandrel is reduced, and the effect of protecting the electric spindle is achieved.

[0023] 3. The electric spindle convenient for heat dissipation, the first front end bearing and the second front end bearing are installed through the setting of the shaft sleeve, and the gap A is formed between the first front end bearing and the second front end bearing through the setting of the positioning ring, and since the end of the mandrel and the front end cover have a gap, when the oil liquid enters the inside of the flow guide pipe through the connecting pipe, part of the cooling oil will enter the inside of the gap, which can effectively lubricate the first front end bearing and the second front end bearing, and prevent the two front end bearings from rotating to generate heat.

[0024] 4. The electric spindle convenient for heat dissipation, the first tail end bearing and the second tail end bearing are positioned by the sinking groove, and since the side of the second tail end bearing away from the first tail end bearing faces the inner cavity of the tail end cover, and the end of the first tail end bearing close to the mandrel is provided with a tail end bearing oil seal, the cooling oil in the inner cavity of the tail end cover can enter the inside of the two tail end bearings to lubricate the two tail end bearings, and prevent the two tail end bearings from rotating to generate heat. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0026] Figure 1 is a structural schematic view of the electric spindle convenient for heat dissipation of the present application;

[0027] Figure 2It is a structure schematic view of a spindle housing of the electric spindle convenient for heat dissipation of the application;

[0028] Figure 3 It is an internal structure schematic view of a cooling sleeve of the electric spindle convenient for heat dissipation of the application;

[0029] Figure 4 It is an internal structure schematic view of a cooling cylinder of the electric spindle convenient for heat dissipation of the application;

[0030] Figure 5 It is an internal structure schematic view of a front end cover of the electric spindle convenient for heat dissipation of the application;

[0031] Figure 6 It is a structure schematic view of a front end rotating structure and a tail end rotating structure of the electric spindle convenient for heat dissipation of the application;

[0032] Figure 7 It is an internal structure schematic view of a tail end cover of the electric spindle convenient for heat dissipation of the application;

[0033] Figure 8 It is a structure schematic view of a spindle housing of the electric spindle convenient for heat dissipation of the application.

[0034] Figure 9 It is an internal structure plane schematic view of the electric spindle convenient for heat dissipation of the application.

[0035] In the figure, 1, spindle housing; 101, containing cavity; 102, installation cavity; 103, heat dissipation pipe; 104, flow guide pipe; 105, separation plate; 106, tail end rotating structure; 1061, first tail end bearing; 1062, second tail end bearing; 1063, sunken groove; 1064, tail end bearing oil seal; 107, sealing ring; 2, front end cover; 201, communication pipe; 202, front end positioning hole; 203, front end rotating structure; 2031, shaft sleeve; 2032, first front end bearing; 2033, second front end bearing; 2034, front end oil seal; 2035, positioning ring; 2036, front end bearing oil seal; 204, extension port; 3, tail end cover; 301, oil liquid inlet pipe; 302, oil liquid outlet pipe; 4, shaft rod; 5, mandrel; 6, cooling cylinder; 601, flow distribution pipe; 602, baffle; 603, push flow turbine; 604, fixed shaft; 605, separation cavity; 606, motor controller; 607, flow distribution hole; 7, cooling sleeve; 8, fixed plate; 9, housing bolt; 10, cooling fin. DETAILED DESCRIPTION

[0036] In the following, the application is further described in combination with the drawings and the specific embodiments:

[0037] Embodiment:

[0038] Reference Figure 1 - Figure 9 The utility model discloses an electric spindle convenient for heat dissipation, which comprises a spindle shell 1, a front end cover 2, a tail end cover 3, a shaft rod 4 and a mandrel 5, the front end cover 2 is fixedly installed at the front end of the spindle shell 1, and the tail end cover 3 is fixedly installed at the tail end of the spindle shell 1.

[0039] The inside of the spindle shell 1 is provided with a containing cavity 101, the mandrel 5 is rotationally arranged in the inside of the containing cavity 101, the outer peripheral wall of the mandrel 5 is attached to the cavity wall of the containing cavity 101, the inside of the mandrel 5 is provided with an installation cavity 102 for installing the shaft rod 4, the shell wall of the spindle shell 1 is provided with a heat dissipation pipe 103, the cavity wall of the containing cavity 101 is provided with a flow guide pipe 104 at the position corresponding to the heat dissipation pipe 103, and the tail end of the spindle shell 1 is provided with a separation plate 105, and the inside of the separation plate 105 is provided with a tail end rotating structure 106.

[0040] The inside of the cover body of the front end cover 2 is provided with a communicating pipe 201, the communicating pipe 201 is arranged in a U shape, the inside of the front end cover 2 is provided with a front end positioning hole 202 for positioning the shaft rod 4, and the inside of the front end positioning hole 202 is provided with a front end rotating structure 203.

[0041] The inside of the cover body of the tail end cover 3 is provided with an oil inlet pipe 301 and an oil outlet pipe 302, the position of the oil inlet pipe 301 corresponds to the position of the flow guide pipe 104, the position of the oil outlet pipe 302 corresponds to the position of the heat dissipation pipe 103, and the tail end cover 3 is provided with a cooling cylinder 6 away from the spindle shell 1.

[0042] One end of the cooling cylinder 6 is provided with a shunt pipe 601 inserted into the inside of the tail end cover 3, the outer peripheral wall of the shunt pipe 601 is provided with a baffle 602, the baffle 602 is located between the oil inlet pipe 301 and the oil outlet pipe 302, the inside of the shunt pipe 601 is provided with a push flow turbine 603, and the inside of the push flow turbine 603 is provided with a fixed shaft 604 fixedly connected with the shaft rod 4.

[0043] In the embodiment, when the front end cover 2 and the rear end cover are fixedly connected with the spindle shell 1, the oil outlet pipe 302 is communicated with the heat dissipation pipe 103, the oil inlet pipe 301 is communicated with the flow guide pipe 104, the communicating pipe 201 communicates the heat dissipation pipe 103 and the flow guide pipe 104, at this time, the oil outlet pipe 302, the heat dissipation pipe 103, the communicating pipe 201, the flow guide pipe 104, the oil inlet pipe 301 and the inner cavity of the tail end cover 3 (the inner cavity of the tail end cover 3 is marked as B) jointly form a loop for oil circulation, and the inside of the tail end cover 3 is filled with cooling oil, in the process of flowing of the cooling oil in the loop, the purpose of heat dissipation of the electric spindle is achieved.

[0044] In use of the device, the shaft 4 rotates, and since the push flow turbine 603 is fixedly connected with the fixed shaft 604 and the fixed shaft 604 is fixedly connected with the shaft 4, the shaft 4 drives the push flow turbine 603 to rotate in the rotation process, so as to drive the cooling oil in the tail end cover 3 to flow, and the cooling oil flows in the oil circuit under the influence of the push flow turbine 603, and the oil is discharged through the heat dissipation pipe 103 in the flowing process, so as to achieve the effect of convenient heat dissipation.

[0045] Since the flow guide pipe 104 is arranged on the cavity wall of the accommodating cavity 101, and the outer wall of the mandrel 5 is attached to the cavity wall of the accommodating cavity 101, the flow guide pipe 104 and the outer wall of the mandrel 5 jointly form a pipeline for oil flow at this time, so that the cooling oil contacts the outer wall of the mandrel 5 in the flowing process, so as to facilitate heat absorption of the mandrel 5.

[0046] Since each oil circuit is in communication with the inner cavity of the tail end cover 3, and the same push flow turbine 603 provides power for the oil, the oil pressure in each oil circuit is equal at this time, so that the pressure of the cooling oil on the outer wall of the mandrel 5 is the same, and the oil can be uniformly attached to the outer wall of the mandrel 5 in the rotation process of the mandrel 5, so that the stability of the mandrel 5 is improved, and the friction between the mandrel 5 and the cavity wall of the accommodating cavity 101 is reduced, so as to reduce the possibility of frictional heating of the mandrel 5, and achieve the effect of protecting the motorized spindle.

[0047] The front end rotating structure 203 and the tail end rotating structure 106 are used to rotatably connect the shaft 4 with the front end cover 2 and the tail end cover 3, and the baffle 602 divides the inner cavity B of the tail end cover 3 into two cavities, and the shunt pipe 601 is connected.

[0048] In a further preferred embodiment of the present application, as shown in Figures 1-9 The inner part of the cooling cylinder 6 is provided with a separation cavity 605, the inner part of the separation cavity 605 is provided with a motor controller 606, and one end of the motor controller 606 is provided with an external wire penetrating through the separation cavity 605 and the cooling cylinder 6.

[0049] In this embodiment, the separation cavity 605 is arranged to install the motor controller 606, and the separation cavity 605 separates the motor controller 606 from the cooling oil, and at the same time, the heat of the motor controller 606 can be conducted to the cooling oil through the separation cavity 605, so as to achieve the purpose of protecting the motor controller.

[0050] In a further preferred embodiment of the present application, as shown in Figures 1-9 The both ends of the flow guide pipe 104 and the heat dissipation pipe 103 are provided with sealing rings 107.

[0051] In the embodiment, when the tail end cover 3 and the front end cover 2 are fixedly connected with the main shaft shell 1, the sealing ring 107 corresponds to the position of the communication pipe 201, so as to seal the gap between the communication pipe 201 and the flow guide pipe 104 and the heat dissipation pipe 103, and prevent oil leakage.

[0052] In a further preferred embodiment of the present application, as shown in Figures 1-9 both ends of the communication pipe 201 are provided with extension openings 204, and the two ends of the communication pipe 201 correspond to the positions of the heat dissipation pipe 103 and the flow guide pipe 104, respectively.

[0053] In the embodiment, the extension openings 204 are provided to protrude the connecting pipe, and when the front end cover 2 is fixedly connected with the main shaft shell 1, the extension openings 204 at both ends are inserted into the flow guide pipe 104 and the heat dissipation pipe 103, respectively, so as to further prevent leakage at the connecting position.

[0054] In a further preferred embodiment of the present application, as shown in Figures 1-9 the front end rotating structure 203 includes a shaft sleeve 2031, a first front end bearing 2032, a second front end bearing 2033, and a front end oil seal 2034, the shaft sleeve 2031 is sleeved on the outer peripheral wall of the shaft rod 4 and corresponds to the front end cover 2, the outer peripheral wall of the shaft sleeve 2031 is fixedly provided with a positioning ring 2035, the first front end bearing 2032 and the second front end bearing 2033 are both sleeved on the outer peripheral wall of the shaft sleeve 2031 and are located on the two sides of the positioning ring 2035, respectively, the second front end bearing 2033 is close to the mandrel 5, and the first front end bearing 2032 and the second front end bearing 2033 are both provided with a front end bearing oil seal 2036 on the side away from each other.

[0055] In the embodiment, the shaft sleeve 2031 is provided to mount the first front end bearing 2032 and the second front end bearing 2033, the positioning ring 2035 is provided to form a gap A between the first front end bearing 2032 and the second front end bearing 2033, and since there is a gap between the end of the mandrel 5 and the front end cover 2, when the oil enters the inside of the flow guide pipe 104 through the connecting pipe, part of the cooling oil will enter the inside of the gap A, as shown in Figure 9 the first front end bearing 2032 and the second front end bearing 2033 can be effectively lubricated, and the generation of heat caused by the rotation of the two front end bearings can be prevented, and the front end bearing oil seals 2036 on both sides are provided to prevent the cooling oil from entering the inside of the mandrel 5 through the bearings, and the front end oil seal 2034 is provided to prevent oil leakage.

[0056] In a further preferred embodiment of the present application, as shown in Figures 1-9As shown, the tail end rotating structure 106 comprises a first tail end bearing 1061, a second tail end bearing 1062 and a sunken groove 1063, which is arranged on the outer wall of the shaft 4 and corresponds to the position of the separation plate 105, the first tail end bearing 1061 and the second tail end bearing 1062 are both arranged in the sunken groove 1063 of the shaft 4, and the first tail end bearing 1061 is provided with a tail end bearing oil seal 1064 on the side close to the mandrel 5.

[0057] In the embodiment, the first tail end bearing 1061 and the second tail end bearing 1062 are positioned by the sunken groove 1063, and since the side of the second tail end bearing 1062 away from the first tail end bearing 1061 is directed to the inner cavity B of the tail end cover 3, and the first tail end bearing 1061 is provided with the tail end bearing oil seal 1064 on the side close to the mandrel 5, the cooling oil in the inner cavity B of the tail end cover 3 can enter the interiors of the two tail end bearings to lubricate the two tail end bearings, and the heat generated by the rotation of the two tail end bearings can be prevented.

[0058] In further preferable embodiments of the present application, as shown in Figures 1-9 The shunt pipe 601 is provided with a gap between the end close to the separation plate 105 and the separation plate 105, and the outer wall of the end away from the separation plate 105 is provided with a plurality of shunt holes 607 arranged in a ring array.

[0059] In the embodiment, the inner cavity B of the tail end cover 3 is divided into two cavities by the baffle 602, and is connected by the shunt pipe 601, so that the cooling oil can only be discharged through the shunt holes 607 of the shunt pipe 601, and the positions of the shunt holes 607 correspond to the positions of the oil discharge holes, thus the oil can only be discharged through the oil discharge holes after being discharged through the shunt holes 607, and then enters the interior of the heat dissipation pipe 103 to form a passage.

[0060] In further preferable embodiments of the present application, as shown in Figures 1-9 The outer wall of the main shaft shell 1 is fixedly provided with a cooling jacket 7, both ends of the cooling jacket 7 are provided with fixed plates 8, the fixed plates 8 are fixedly connected with the outer walls of the front end cover 2 and the tail end cover 3 respectively, and the interiors of the fixed plates 8 are provided with a plurality of shell bolts 9, the inner wall of the cooling jacket 7 is provided with a plurality of cooling fins 10, and the cooling fins 10 are in contact with the surface of the main shaft shell 1.

[0061] In the embodiment, the front end cover 2 and the tail end cover 3 are connected with the main shaft shell 1 by the fixed plates 8 and the shell bolts 9, and the cooling fins 10 in contact with the surface of the main shaft shell 1 further improve the heat dissipation efficiency of the main shaft shell and the heat dissipation pipe 103.

[0062] While embodiments of the application have been shown and described, it is to be understood that the embodiments described are merely exemplary of the principles and application of the present application. Numerous modifications and adaptions can be effected without departing from the spirit and scope of the present application, which is not limited to the exact construction and arrangement described. It is intended, therefore, to cover all modifications and adaptions that fall within the scope of the claims and their equivalents.

Claims

1. An electric spindle facilitating heat dissipation, characterized by, It includes main shaft shell (1), front end cover (2), tail end cover (3), shaft rod (4) and mandrel (5), front end cover (2) is fixedly installed at the front end of main shaft shell (1), tail end cover (3) is fixedly installed at the tail end of main shaft shell (1); The inside of main shaft shell (1) is provided with containing cavity (101), mandrel (5) is rotationally arranged in the inside of containing cavity (101), the outer peripheral wall of mandrel (5) is in close fit with the cavity wall of containing cavity (101), there is a gap between the end of mandrel (5) and front end cover (2), and the inside of mandrel (5) is provided with installation cavity (102) for installing shaft rod (4), the inside of shell wall of main shaft shell (1) is provided with heat dissipation pipe (103), the cavity wall of containing cavity (101) is provided with flow guide pipe (104) at the position corresponding to heat dissipation pipe (103), the tail end of main shaft shell (1) is provided with separation plate (105), the inside of separation plate (105) is provided with tail end rotating structure (106); The inside of cover body of front end cover (2) is provided with communication pipe (201), communication pipe (201) is arranged in U shape, the inside of front end cover (2) is provided with front end positioning hole (202) for positioning shaft rod (4), and the inside of front end positioning hole (202) is provided with front end rotating structure (203); The inside of cover body of tail end cover (3) is provided with oil inlet pipe (301) and oil outlet pipe (302), the position of oil inlet pipe (301) corresponds to the position of flow guide pipe (104), the position of oil outlet pipe (302) corresponds to the position of heat dissipation pipe (103), and the end of tail end cover (3) away from main shaft shell (1) is provided with cooling cylinder (6); One end of cooling cylinder (6) is provided with shunt pipe (601) inserted into the inside of tail end cover (3), the outer peripheral wall of shunt pipe (601) is provided with baffle (602), the baffle (602) is located between oil inlet pipe (301) and oil outlet pipe (302), the inside of shunt pipe (601) is provided with push flow turbine (603), and the inside of push flow turbine (603) is provided with fixed shaft (604) fixedly connected with shaft rod (4).

2. The motorized spindle according to claim 1, wherein, The inside of cooling cylinder (6) is provided with separation cavity (605), the inside of separation cavity (605) is provided with motor controller (606), and one end of motor controller (606) is provided with external lead wire penetrating separation cavity (605) and cooling cylinder (6).

3. The motorized spindle according to claim 2, wherein, The two ends of flow guide pipe (104) and heat dissipation pipe (103) are provided with sealing rings (107).

4. The motorized spindle of claim 3, wherein, The two ends of communication pipe (201) are provided with extension openings (204), and the two ends of communication pipe (201) correspond to the positions of heat dissipation pipe (103) and flow guide pipe (104) respectively.

5. The motorized spindle of claim 4, wherein the cooling fan is disposed within the housing. The front end rotating structure (203) comprises a shaft sleeve (2031), a first front end bearing (2032), a second front end bearing (2033) and a front end oil seal (2034), the shaft sleeve (2031) is sleeved on the outer wall of the shaft rod (4) and corresponds to the front end cover (2), the outer wall of the shaft sleeve (2031) is fixedly provided with a positioning ring (2035), the first front end bearing (2032) and the second front end bearing (2033) are both sleeved on the outer wall of the shaft sleeve (2031) and are located on the two sides of the positioning ring (2035) respectively, the second front end bearing (2033) is close to the mandrel (5), and the side, away from each other, of the first front end bearing (2032) and the second front end bearing (2033) is provided with a front end bearing oil seal (2036).

6. The motorized spindle of claim 5, wherein the cooling fan is disposed within the housing. The tail end rotating structure (106) comprises a first tail end bearing (1061), a second tail end bearing (1062) and a sunken groove (1063), the sunken groove (1063) is arranged on the outer wall of the shaft rod (4) and corresponds to the position of the separation plate (105), the first tail end bearing (1061) and the second tail end bearing (1062) are both sleeved at the sunken groove (1063) of the shaft rod (4), and the side, close to the mandrel (5), of the first tail end bearing (1061) is provided with a tail end bearing oil seal (1064).

7. The motorized spindle of claim 6, wherein the cooling fan is disposed within the housing. The shunt pipe (601) has a gap between one end close to the separation plate (105) and the separation plate (105), and the outer wall of the other end, away from the separation plate (105), of the shunt pipe (601) is provided with a plurality of shunt holes (607) arranged in a ring array.

8. The motorized spindle of claim 7, wherein the cooling fan is disposed within the housing. The outer wall of the main shaft shell (1) is fixedly provided with a cooling jacket (7), both ends of the cooling jacket (7) are provided with fixed plates (8), the two fixed plates (8) are fixedly connected with the outer walls of the front end cover (2) and the tail end cover (3) respectively, and the inside of the fixed plate (8) is provided with a plurality of shell bolts (9), the inner wall of the cooling jacket (7) is provided with a plurality of cooling fins (10), and the cooling fins (10) are mutually attached to the surface of the main shaft shell (1).

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