Electric spindle convenient to dissipate heat

Abstract

The electric spindle 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, a containing cavity is formed in the spindle shell, and the mandrel is rotationally arranged in the containing cavity; the peripheral wall of the core shaft is attached to the cavity wall of the containing cavity, and a mounting cavity used for mounting the shaft rod is formed in the core shaft. The invention relates to the field of electric spindles. According to the electric spindle convenient to dissipate heat, the shaft rod can drive the plug flow turbine to rotate in the rotating process, so that cooling oil in the tail end cover is pushed to flow through the plug flow turbine; cooling oil flows in an oil circulation loop formed by the oil discharge pipe, the heat dissipation pipe, the communicating pipe, the flow guide pipe, the oil inlet pipe and the inner cavity of the tail end cover under the influence of the plug flow turbine, and then heat is discharged through the flowing oil, so that the purposes of cooling and heat dissipation are achieved.

Description

Technical Field

[0001] The invention relates to the field of electric spindles, and in particular to an electric spindle that is easy to dissipate heat. Background Art

[0002] The electric spindle is the core component of high-speed machining machine tools. It is a new technology that has emerged in the field of CNC machine tools, integrating the machine tool spindle and the spindle motor. Together with linear motor technology and high-speed tool technology, the motor's rotor directly serves as the machine tool's spindle, and the housing of the spindle unit is the motor base, and it cooperates with other components to achieve the integration of the motor and the machine tool spindle.

[0003] However, since the electric spindle integrates the motor in the spindle unit, when it runs at high speed, the internal bearings, rotors, etc. will generate friction, causing heat to rise, and when the current passes through the winding, a certain amount of resistance loss will be generated. These energies will also increase the temperature inside the electric spindle, which can easily increase the loss of the electric spindle itself and seriously reduce the service life of the electric spindle.

[0004] Therefore, those skilled in the art provide an electric spindle that is easy to dissipate heat to solve the problems raised in the above background technology. Summary of the invention

[0005] The object of the present invention is to provide an electric spindle that is easy to dissipate heat, so as to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] The above technical objectives of the present invention are achieved through the following technical solutions:

[0008] An electric spindle convenient for heat dissipation comprises a spindle housing, a front end cover, a rear end cover, a shaft rod and a core shaft, wherein the front end cover is fixedly mounted on the front end of the spindle housing, and the rear end cover is fixedly mounted on the rear end of the spindle housing;

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

[0010] A connecting pipe is provided inside the cover body of the front end cover, and the connecting pipe is arranged in a U shape. A front end positioning hole for positioning the shaft rod is provided inside the front end cover, and a front end rotating structure is provided inside the front end positioning hole.

[0011] An oil inlet pipe and an oil outlet pipe are provided inside the cover body of the tail end cover, and the position of the oil inlet pipe corresponds to the position of the guide pipe, and the position of the oil outlet pipe corresponds to the position of the heat dissipation pipe. A cooling cylinder is provided at one end of the tail end cover away from the spindle housing;

[0012] A shunt pipe inserted into the tail end cover is provided at one end of the cooling cylinder, a baffle is provided on the outer peripheral wall of the shunt pipe, and the baffle is located between the oil inlet pipe and the oil outlet pipe, a plug flow turbine is provided inside the shunt pipe, and a fixed shaft fixedly connected to the shaft rod is provided inside the plug flow turbine.

[0013] Furthermore, a separation chamber is provided inside the cooling cylinder, a motor controller is provided inside the separation chamber, and an external wire penetrating the separation chamber and the cooling cylinder is provided at one end of the motor controller.

[0014] Furthermore, sealing rings are provided at both end openings of the flow guide pipe and the heat dissipation pipe.

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

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

[0017] Furthermore, the tail end rotating structure includes a first tail end bearing, a second tail end bearing and a sinking groove. The sinking groove is opened on the outer peripheral wall of the shaft rod and at a position corresponding to the separation plate. The first tail end bearing and the second tail end bearing are both sleeved on the sinking groove of the shaft rod. A tail end bearing oil seal is provided on the side of the first tail end bearing close to the core shaft.

[0018] Furthermore, there is a gap between one end of the diverter tube close to the separation plate and the separation plate, and a plurality of diverter holes arranged in a ring array are formed on the outer peripheral wall of one end of the diverter tube away from the separation plate.

[0019] Furthermore, a cooling jacket is fixedly provided on the outer peripheral wall of the spindle housing, and fixing plates are provided at both ends of the cooling jacket. The two fixing plates are respectively fixedly connected to the outer peripheral walls of the front end cover and the rear end cover, and a plurality of housing bolts are provided inside the fixing plates. A plurality of cooling fins are provided on the inner wall of the cooling jacket, and the cooling fins are in contact with the surface of the spindle housing.

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

[0021] 1. In this electric spindle which is convenient for heat dissipation, the shaft will drive the plug-flow turbine to rotate during the rotation process, so as to push the cooling oil inside the tail end cover to flow through the plug-flow turbine, so that the cooling oil flows in the oil discharge pipe, the heat dissipation pipe, the connecting pipe, the guide pipe, the oil inlet pipe and the inner cavity of the tail end cover under the influence of the plug-flow turbine. The oil flows in the oil circulation circuit formed by the oil discharge pipe, the heat dissipation pipe, the connecting pipe, the guide pipe, the oil inlet pipe and the inner cavity of the tail end cover, and then the heat is discharged through the flowing oil to achieve the purpose of cooling and heat dissipation;

[0022] 2. In the electric spindle that is easy to dissipate heat, each oil circuit is interconnected with the inner cavity of the tail end cover, and the oil is powered by the same plug-flow turbine, so the oil pressure in each oil circuit is equal. At this time, the pressure of the cooling oil on the outer wall of the mandrel is the same, so the oil can be evenly attached to the outer wall of the mandrel during the rotation of the mandrel, so that the stability of the mandrel is improved, and the friction between the mandrel and the wall of the accommodating cavity can be reduced, so as to reduce the possibility of frictional heat generation of the mandrel, thereby achieving the effect of protecting the electric spindle;

[0023] 3. The electric spindle that is easy to dissipate heat is used to install the first front end bearing and the second front end bearing through the setting of the shaft sleeve. Through the setting of the positioning ring, a gap A is formed between the first front end bearing and the second front end bearing. Since there is a gap between the end of the core shaft and the front end cover, when the oil enters the interior of the guide tube through the connecting pipe, part of the cooling oil will enter the interior of the gap, which can effectively lubricate the first front end bearing and the second front end bearing, and can prevent the two front end bearings from rotating and causing heat generation;

[0024] 4. An electric spindle that is easy to dissipate heat is used to position the first tail end bearing and the second tail end bearing through a sinking groove. 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 core shaft is provided with a tail end bearing oil seal, the cooling oil in the inner cavity of the tail end cover can enter the interior of the two tail end bearings, lubricate the two tail end bearings, and prevent the two tail end bearings from rotating and causing heat generation. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a structural schematic diagram of an electric spindle that is easy to dissipate heat according to the present invention;

[0027] Figure 2It is a structural schematic diagram of a spindle housing of an electric spindle that is easy to dissipate heat according to the present invention;

[0028] Figure 3 It is a schematic diagram of the internal structure of a cooling jacket of an electric spindle that is convenient for heat dissipation according to the present invention;

[0029] Figure 4 It is a schematic diagram of the internal structure of a cooling cylinder of an electric spindle that is convenient for heat dissipation according to the present invention;

[0030] Figure 5 It is a schematic diagram of the internal structure of a front end cover of an electric spindle that is convenient for heat dissipation according to the present invention;

[0031] Figure 6 It is a structural schematic diagram of a front end rotating structure and a rear end rotating structure of an electric spindle that are convenient for heat dissipation of the present invention;

[0032] Figure 7 It is a schematic diagram of the internal structure of a tail end cover of an electric spindle that is convenient for heat dissipation according to the present invention;

[0033] Figure 8 The present invention is a schematic structural diagram of a spindle housing of an electric spindle that is easy to dissipate heat.

[0034] Fig. 9 It is a schematic plan view of the internal structure of an electric spindle that is easy to dissipate heat according to the present invention.

[0035] In the figure, 1, spindle housing; 101, accommodating cavity; 102, mounting cavity; 103, heat dissipation pipe; 104, guide pipe; 105, separation plate; 106, tail end rotating structure; 1061, first tail end bearing; 1062, second tail end bearing; 1063, sinking groove; 1064, tail end bearing oil seal; 107, sealing ring; 2, front end cover; 201, connecting 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 inlet pipe; 302, oil outlet pipe; 4, shaft; 5, core shaft; 6, cooling cylinder; 601, shunt pipe; 602, baffle; 603, plug flow turbine; 604, fixed shaft; 605, separation chamber; 606, motor controller; 607, shunt hole; 7, cooling jacket; 8, fixing plate; 9, housing bolts; 10, cooling fins. DETAILED DESCRIPTION

[0036] Below, the invention is further described in conjunction with the accompanying drawings and specific embodiments:

[0037] Example:

[0038] Reference Figure 1 - Fig. 9 The present invention discloses an electric spindle that is easy to dissipate heat, comprising a spindle housing 1, a front end cover 2, a rear end cover 3, a shaft 4 and a core shaft 5, wherein the front end cover 2 is fixedly mounted on the front end of the spindle housing 1, and the rear end cover 3 is fixedly mounted on the rear end of the spindle housing 1;

[0039] The spindle housing 1 is provided with a receiving cavity 101 inside, the core shaft 5 is rotatably arranged inside the receiving cavity 101, the outer peripheral wall of the core shaft 5 is in contact with the cavity wall of the receiving cavity 101, and the core shaft 5 is provided with a mounting cavity 102 for mounting the shaft rod 4, a heat dissipation pipe 103 is provided inside the shell wall of the spindle housing 1, a guide pipe 104 is provided at a position of the cavity wall of the receiving cavity 101 corresponding to the heat dissipation pipe 103, a separation plate 105 is provided at the tail end of the spindle housing 1, and a tail end rotating structure 106 is provided inside the separation plate 105;

[0040] A connecting pipe 201 is provided inside the cover body of the front end cover 2. The connecting pipe 201 is U-shaped. A front end positioning hole 202 for positioning the shaft rod 4 is provided inside the front end cover 2. A front end rotating structure 203 is provided inside the front end positioning hole 202.

[0041] An oil inlet pipe 301 and an oil outlet pipe 302 are provided inside the cover body of the tail end cover 3, and the position of the oil inlet pipe 301 corresponds to the position of the guide pipe 104, and the position of the oil outlet pipe 302 corresponds to the position of the heat dissipation pipe 103. A cooling cylinder 6 is provided at one end of the tail end cover 3 away from the spindle housing 1;

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

[0043] In this embodiment, when the front cover 2 and the rear cover are fixedly connected to the spindle housing 1, the oil discharge pipe 302 is connected to the heat dissipation pipe 103, the oil inlet pipe 301 is connected to the guide pipe 104, and the connecting pipe 201 connects the heat dissipation pipe 103 and the guide pipe 104. At this time, the oil discharge pipe 302, the heat dissipation pipe 103, the connecting pipe 201, the guide pipe 104, the oil inlet pipe 301 and the inner cavity of the tail cover 3 (label B is the inner cavity of the tail cover 3) together form a circuit for oil circulation, and the interior of the tail cover 3 is filled with cooling oil. When the cooling oil flows in the circuit, the purpose of heat dissipation of the electric spindle is achieved;

[0044] When the device is in use, the shaft 4 rotates. Since the plug-flow turbine 603 is fixedly connected to the fixed shaft 604, and the fixed shaft 604 is fixedly connected to the shaft 4, the shaft 4 will drive the plug-flow turbine 603 to rotate during the rotation, so as to promote the cooling oil inside the tail cover 3 to flow through the plug-flow turbine 603, so that the cooling oil flows in the oil circuit under the influence of the plug-flow turbine 603, and the oil discharges heat through the heat dissipation pipe 103 during the flow process, so as to achieve the effect of facilitating heat dissipation;

[0045] Since the flow guide tube 104 is provided at the cavity wall of the accommodating cavity 101, and the outer peripheral wall of the core shaft 5 is in contact with the cavity wall of the accommodating cavity 101, the flow guide tube 104 and the outer wall of the core shaft 5 together form a pipeline for oil circulation, and the cooling oil will contact the outer wall of the core shaft 5 during the flow process, so as to absorb the heat of the core shaft 5;

[0046] At the same time, since each oil circuit is interconnected with the inner cavity of the tail end cover 3, and the oil is powered by the same plug-flow turbine 603, the oil pressure in each oil circuit is equal. At this time, the pressure of the cooling oil on the outer wall of the core shaft 5 is the same. Therefore, the oil can be evenly attached to the outer wall of the core shaft 5 during the rotation of the core shaft 5, so that the stability of the core shaft 5 is improved, and the friction between the core shaft 5 and the wall of the accommodating cavity 101 can be reduced, so as to reduce the possibility of frictional heat generation of the core shaft 5, thereby achieving the effect of protecting the electric spindle;

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

[0048] In a further preferred embodiment of the present invention, Figure 1-9 As shown, a separation chamber 605 is disposed inside the cooling cylinder 6 , a motor controller 606 is disposed inside the separation chamber 605 , and an external wire penetrating the separation chamber 605 and the cooling cylinder 6 is disposed at one end of the motor controller 606 .

[0049] In this embodiment, the separation chamber 605 is provided to install the motor controller 606. The motor controller 606 and the cooling oil are separated from each other by the separation chamber 605, and the heat of the motor controller 606 can be transferred to the cooling oil through the separation chamber 605, so as to achieve the purpose of protecting the motor control.

[0050] In a further preferred embodiment of the present invention, Figure 1-9 As shown, sealing rings 107 are provided at both end openings of the air guide pipe 104 and the heat dissipation pipe 103 .

[0051] In this embodiment, when the tail end cover 3 and the front end cover 2 are fixedly connected to the spindle housing 1, the positions of the sealing ring 107 and the connecting pipe 201 will correspond to each other, so as to achieve the purpose of sealing the gap between the connecting pipe 201 and the guide pipe 104 and the heat dissipation pipe 103, so as to close the connection of the oil circuit and prevent oil leakage.

[0052] In a further preferred embodiment of the present invention, Figure 1-9 As shown, both ends of the connecting pipe 201 are provided with extension openings 204 , and the two ends of the connecting pipe 201 correspond to the positions of the heat dissipation pipe 103 and the guide pipe 104 , respectively.

[0053] In this embodiment, the extension opening 204 is provided to make the connecting pipe protrude. When the front end cover 2 is fixedly connected to the spindle housing 1, the extension openings 204 at both ends are respectively inserted into the interior of the guide pipe 104 and the heat dissipation pipe 103, which can further prevent leakage problems at the connection.

[0054] In a further preferred embodiment of the present invention, Figure 1-9 As shown, the front end rotating structure 203 includes a sleeve 2031, a first front end bearing 2032, a second front end bearing 2033 and a front end oil seal 2034. The sleeve 2031 is sleeved on the outer peripheral wall of the shaft rod 4 and corresponds to the front end cover 2. A positioning ring 2035 is fixedly provided on the outer peripheral wall of the sleeve 2031. The first front end bearing 2032 and the second front end bearing 2033 are both sleeved on the outer peripheral wall of the sleeve 2031 and are respectively located on both sides of the positioning ring 2035. The second front end bearing 2033 is close to the core shaft 5. 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 this embodiment, the sleeve 2031 is used to install the first front end bearing 2032 and the second front end bearing 2033, and 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. Since there is a gap between the end of the core shaft 5 and the front end cover 2, when the oil enters the interior of the guide tube 104 through the connecting pipe, part of the cooling oil will enter the interior of the gap A, such as Fig. 9 As shown, the first front end bearing 2032 and the second front end bearing 2033 can be effectively lubricated, and the two front end bearings can be prevented from rotating to cause heat generation. The front end bearing oil seals 2036 on both sides are arranged to prevent cooling oil from passing through the bearings and entering the interior of the core shaft 5, and the front end oil seal 2034 is arranged to prevent oil leakage.

[0056] In a further preferred embodiment of the present invention, Figure 1-9As shown, the tail end rotating structure 106 includes a first tail end bearing 1061, a second tail end bearing 1062 and a sinking groove 1063. The sinking groove 1063 is opened on the outer peripheral wall of the shaft rod 4 and at a position corresponding to the separation plate 105. The first tail end bearing 1061 and the second tail end bearing 1062 are both sleeved on the sinking groove 1063 of the shaft rod 4. A tail end bearing oil seal 1064 is provided on the side of the first tail end bearing 1061 close to the core shaft 5.

[0057] In this embodiment, the sinking groove 1063 is used to position the first tail end bearing 1061 and the second tail end bearing 1062, and since the side of the second tail end bearing 1062 away from the first tail end bearing 1061 faces the inner cavity B of the tail end cover 3, and the end of the first tail end bearing 1061 close to the core shaft 5 is provided with a tail end bearing oil seal 1064, the cooling oil in the inner cavity B of the tail end cover 3 can enter the interior of the two tail end bearings, lubricate the two tail end bearings, and prevent the two tail end bearings from rotating and causing heat generation.

[0058] In a further preferred embodiment of the present invention, Figure 1-9 As shown, there is a gap between the end of the diverter tube 601 close to the separation plate 105 and the separation plate 105 , and a plurality of diverter holes 607 arranged in a ring array are formed on the outer peripheral wall of the end of the diverter tube 601 away from the separation plate 105 .

[0059] In this embodiment, the inner cavity B of the tail end cover 3 is divided into two cavities by the baffle 602, and connected by the diverter pipe 601, so that the cooling oil can only be discharged through the diverter hole 607 of the diverter pipe 601, and the position of the diverter hole 607 corresponds to the position of the oil discharge hole. Therefore, after the oil is discharged through the diverter hole 607, it can only be discharged through the oil discharge hole and enter the interior of the heat dissipation pipe 103 to achieve the purpose of forming a passage.

[0060] In a further preferred embodiment of the present invention, Figure 1-9 As shown, a cooling sleeve 7 is fixedly provided on the outer peripheral wall of the spindle housing 1, and fixing plates 8 are provided at both ends of the cooling sleeve 7. The two fixing plates 8 are respectively fixedly connected to the outer peripheral walls of the front end cover 2 and the rear end cover 3, and a plurality of housing bolts 9 are provided inside the fixing plates 8. A plurality of cooling fins 10 are provided on the inner wall of the cooling sleeve 7, and the cooling fins 10 are in contact with the surface of the spindle housing 1.

[0061] In this embodiment, the front end cover 2 and the rear end cover 3 are connected to the spindle housing 1 by the fixing plate 8 and the housing bolts 9, and the cooling fins 10 in contact with the surface of the spindle housing 1 further improve the heat dissipation efficiency of the spindle housing and the heat pipe 103.

[0062] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An electric spindle that is easy to dissipate heat, characterized in that: It comprises a spindle housing (1), a front end cover (2), a rear end cover (3), a shaft (4) and a spindle (5), wherein the front end cover (2) is fixedly mounted on the front end of the spindle housing (1), and the rear end cover (3) is fixedly mounted on the rear end of the spindle housing (1); A receiving cavity (101) is arranged inside the spindle housing (1), the core shaft (5) is rotatably arranged inside the receiving cavity (101), the outer peripheral wall of the core shaft (5) is in contact with the cavity wall of the receiving cavity (101), a gap is provided between the end of the core shaft (5) and the front end cover (2), and a mounting cavity (102) for mounting the shaft rod (4) is arranged inside the core shaft (5), a heat dissipation pipe (103) is provided inside the shell wall of the spindle housing (1), a guide pipe (104) is provided at a position of the cavity wall of the receiving cavity (101) corresponding to the heat dissipation pipe (103), a separation plate (105) is arranged at the rear end of the spindle housing (1), and a rear end rotating structure (106) is arranged inside the separation plate (105); A connecting pipe (201) is provided inside the cover body of the front end cover (2), and the connecting pipe (201) is arranged in a U shape. A front end positioning hole (202) for positioning the shaft rod (4) is provided inside the front end cover (2), and a front end rotating structure (203) is provided inside the front end positioning hole (202); An oil inlet pipe (301) and an oil outlet pipe (302) are provided inside the cover body of the tail end cover (3), and the position of the oil inlet pipe (301) corresponds to the position of the guide pipe (104), and the position of the oil outlet pipe (302) corresponds to the position of the heat dissipation pipe (103). A cooling cylinder (6) is provided at one end of the tail end cover (3) away from the spindle housing (1); One end of the cooling cylinder (6) is provided with a shunt pipe (601) inserted into the tail end cover (3), the outer peripheral wall of the shunt pipe (601) is provided with a baffle (602), and the baffle (602) is located between the oil inlet pipe (301) and the oil outlet pipe (302), the shunt pipe (601) is provided with a plug-flow turbine (603), and the plug-flow turbine (603) is provided with a fixed shaft (604) fixedly connected to the shaft rod (4).

2. The electric spindle for facilitating heat dissipation according to claim 1, characterized in that: The cooling cylinder (6) is provided with a separation chamber (605) inside, a motor controller (606) is provided inside the separation chamber (605), and one end of the motor controller (606) is provided with an external wire that passes through the separation chamber (605) and the cooling cylinder (6).

3. The electric spindle for facilitating heat dissipation according to claim 2, characterized in that: Sealing rings (107) are provided at both end openings of the flow guide pipe (104) and the heat dissipation pipe (103).

4. The electric spindle for facilitating heat dissipation according to claim 3, characterized in that: Both ends of the connecting pipe (201) are provided with extension openings (204), and the two ends of the connecting pipe (201) correspond to the positions of the heat dissipation pipe (103) and the flow guide pipe (104), respectively.

5. The electric spindle for facilitating heat dissipation according to claim 4, characterized in that: 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 peripheral wall of the shaft rod (4) and corresponds to the front end cover (2); a positioning ring (2035) is fixedly provided on the outer peripheral wall of the shaft sleeve (2031); 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 respectively located on both sides of the positioning ring (2035); the second front end bearing (2033) is close to the core shaft (5); and a front end bearing oil seal (2036) is provided on the side of the first front end bearing (2032) and the second front end bearing (2033) that are away from each other.

6. The electric spindle for facilitating heat dissipation according to claim 5, characterized in that: The tail end rotating structure (106) comprises a first tail end bearing (1061), a second tail end bearing (1062) and a sinking groove (1063); the sinking groove (1063) is arranged on the outer peripheral wall of the shaft (4) and at a position corresponding to the separation plate (105); the first tail end bearing (1061) and the second tail end bearing (1062) are both sleeved on the sinking groove (1063) of the shaft (4); and a tail end bearing oil seal (1064) is arranged on the side of the first tail end bearing (1061) close to the core shaft (5).

7. The electric spindle for facilitating heat dissipation according to claim 6, characterized in that: There is a gap between the end of the diverter tube (601) close to the separation plate (105) and the separation plate (105), and a plurality of diverter holes (607) arranged in a ring array are formed on the outer peripheral wall of the end of the diverter tube (601) away from the separation plate (105).

8. The electric spindle for facilitating heat dissipation according to claim 7, characterized in that: A cooling sleeve (7) is fixedly provided on the outer peripheral wall of the spindle housing (1), and fixing plates (8) are provided at both ends of the cooling sleeve (7). The two fixing plates (8) are fixedly connected to the outer peripheral walls of the front end cover (2) and the rear end cover (3), respectively, and a plurality of housing bolts (9) are provided inside the fixing plates (8). A plurality of cooling fins (10) are provided on the inner wall of the cooling sleeve (7), and the cooling fins (10) are in contact with the surface of the spindle housing (1).

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