Main shaft heat dissipation structure and electric main shaft

Abstract

The invention discloses a spindle heat dissipation structure and an electric spindle, the spindle heat dissipation structure specifically comprises a machining spindle and a heat dissipation assembly, and the heat dissipation assembly comprises a heat dissipation sleeve, a heat dissipation shell and a heat dissipation cover. By arranging the first cooling channel and the second cooling channel in the heat dissipation shell and communicating the first cooling channel and the second cooling channel with the third cooling channel in the heat dissipation sleeve and the fourth cooling channel in the heat dissipation cover, a circulating flow path of cooling liquid is formed, so that the risk of uneven heat dissipation of the main shaft is greatly reduced, and the stability of temperature distribution of the main shaft is ensured. In addition, a cooling liquid circulation channel covers a heat dissipation assembly of the whole main shaft, and the material thermal fatigue phenomenon caused by local overheating of the main shaft is reduced. Therefore, the main shaft heat dissipation structure and the electric main shaft provided by the invention solve the technical problem of poor heat dissipation effect of the main shaft in the prior art.

Description

Technical Field

[0001] The invention relates to the field of spindle heat dissipation, and in particular to a spindle heat dissipation structure and an electric spindle. Background Art

[0002] With the rapid development and improvement of electric drive technology, the mechanical structure of the main drive system of high-speed CNC machine tools has been greatly simplified, and the pulley drive and gear drive have been basically eliminated. The machine tool spindle is directly driven by a built-in motor, assembled into an electric spindle, and the length of the machine tool main drive chain is shortened to zero.

[0003] In the prior art, the electric spindle integrates the motor into the spindle unit, and its rotation speed is very high. During operation, a large amount of heat is generated, causing the temperature of the electric spindle to rise, thereby deteriorating the thermal and dynamic characteristics of the electric spindle, thereby affecting the normal operation of the electric spindle. The electric spindle usually uses coolant to circulate and cool the motor stator and the electric spindle housing. However, when using the above-mentioned coolant circulation cooling, due to the single coolant circulation channel, overcooling or insufficient cooling is prone to occur during the cooling process, resulting in poor heat dissipation of the spindle, uneven spindle temperature distribution, and affecting the service life of the electric spindle. Summary of the invention

[0004] The purpose of the present invention is to provide a spindle heat dissipation structure and an electric spindle, which solve the problem of poor heat dissipation effect of the spindle in the prior art.

[0005] To achieve this object, the present invention adopts the following technical solutions: According to a first aspect, the present invention discloses a spindle heat dissipation structure, comprising: a processing spindle and a heat dissipation component, wherein the processing spindle is used to install a processing tool, the processing spindle is rotatably embedded in the heat dissipation component, and the heat dissipation component is used to dissipate heat from the processing spindle: The heat dissipation assembly comprises a heat dissipation sleeve, which is sleeved on the processing spindle, a heat dissipation shell is fixedly sleeved on the outer wall of the heat dissipation sleeve, a heat dissipation cover is installed on one end of the heat dissipation shell, and one end of the processing spindle passes through the heat dissipation cover; a first cooling channel and a second cooling channel are opened through the heat dissipation shell, a third cooling channel is provided in the heat dissipation sleeve, and a fourth cooling channel is provided in the heat dissipation cover; Among them, one end of the third cooling channel and one end of the fourth cooling channel are respectively connected to the first cooling channel, the other end of the third cooling channel and the other end of the fourth cooling channel are respectively connected to the second cooling channel, and the first cooling channel, the second cooling channel, the third cooling channel and the fourth cooling channel are all used to accommodate circulating coolant.

[0006] Optionally, the third cooling channel is arranged in a spiral shape, and the inner wall of the heat dissipation shell is provided with a first notch and a second notch, the first notch is connected to the first cooling channel, and the second notch is connected to the second cooling channel.

[0007] Optionally, the outer wall of the heat dissipation shell is provided with a first opening corresponding to the first notch and a second opening corresponding to the second notch; A first plug is installed at the first opening, and a second plug is installed at the second opening.

[0008] Optionally, the first cooling channel is arranged in parallel with the second cooling channel, and both the first cooling channel and the second cooling channel pass through an end surface of the heat dissipation shell that contacts the heat dissipation cover.

[0009] Optionally, the fourth cooling channel includes a first flow channel, a second flow channel and a third flow channel which are connected in sequence, the first flow channel is arranged in an arc shape, and the second flow channel and the third flow channel are arranged in a long strip shape; Among them, one end of the first flow channel is connected to the first cooling channel, and the other end of the second flow channel is connected to the second cooling channel; the second flow channel is vertically arranged to the third flow channel.

[0010] Optionally, the machining main shaft sleeve is provided with a first fan blade and a second fan blade which are arranged opposite to each other, the first fan blade comprises a first impeller, the first impeller is provided with three first blades; the second fan blade comprises a second impeller, the second impeller is provided with three second blades; Among them, the first blades and the second blades are arranged alternately, the inner diameter of the first impeller is larger than the inner diameter of the second impeller, and the length of the first blade is larger than the length of the second blade; the outer wall of the heat dissipation shell is provided with an air inlet and an air outlet, the air inlet is arranged adjacent to the first fan blade, and the air outlet is arranged adjacent to the second fan blade.

[0011] Optionally, each of the first blades is provided with at least one first through hole, and each of the second blades is provided with at least two second through holes.

[0012] Optionally, a first mounting groove is provided at one end of the heat dissipation sleeve, and a first sealing ring is sleeved in the first mounting groove; The other end of the heat dissipation sleeve is provided with a second installation groove arranged opposite to the first installation groove, and a second sealing ring is sleeved in the installation groove. The first sealing ring and the second sealing ring are both used to seal the heat dissipation sleeve and the heat dissipation shell.

[0013] According to a second aspect, the present invention discloses an electric spindle, comprising: a stator, a rotor and the spindle heat dissipation structure as described in the first aspect, the positioning and the rotor are both located in the heat dissipation shell, and the machining spindle, the rotor, the stator, the heat dissipation sleeve and the heat dissipation shell are nested in sequence; A first bearing is sleeved on one end of the processing spindle, and a second bearing is sleeved on the other end of the processing spindle. A first mounting cover for limiting the installation of the first bearing is fixedly connected to the heat dissipation cover. A second mounting cover and a sealing cover are connected to the heat dissipation shell in sequence, and the second mounting cover is used for limiting the installation of the second bearing.

[0014] Optionally, a first sleeve and a second sleeve are sleeved on the machining spindle, the first sleeve abuts against the first bearing, and two second sleeves are distributed at opposite ends of the second bearing; The processing spindle is threadedly connected with a first locking ring and a second locking ring, and a counterweight is installed between the second sleeve and the second locking ring.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a spindle heat dissipation structure, which specifically includes: a processing spindle and a heat dissipation component, wherein the heat dissipation component includes a heat dissipation sleeve, a heat dissipation shell and a heat dissipation cover. By arranging a first cooling channel and a second cooling channel in the heat dissipation shell, and interconnecting them with a third cooling channel in the heat dissipation sleeve and a fourth cooling channel in the heat dissipation cover, a circulation flow path for the coolant is formed, thereby greatly reducing the risk of uneven heat dissipation of the spindle and ensuring the stability of the temperature distribution of the spindle. In addition, the circulation channel of the coolant covers the heat dissipation component of the entire spindle, reducing the thermal fatigue of the material caused by local overheating of the spindle. Therefore, the spindle heat dissipation structure and electric spindle provided by the present invention solve the problem of poor heat dissipation of the spindle in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] 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 or the description of the prior art 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 labor.

[0017] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantive technical significance. Any structural modification, change in proportion or adjustment of size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical contents disclosed by the present invention.

[0018] Figure 1 A schematic diagram of the three-dimensional structure of an electric spindle disclosed in an embodiment of the present invention; Figure 2 A front view of an electric spindle disclosed in an embodiment of the present invention; Figure 3 for Figure 2 AA cross-sectional structural diagram; Figure 4 This is one of the partial structural schematic diagrams of an electric spindle disclosed in an embodiment of the present invention; Figure 5 A front view of a heat dissipation cover in a spindle heat dissipation structure disclosed in an embodiment of the present invention; Figure 6 for Figure 5 BB cross-sectional structure diagram; Figure 7 for Figure 5 Schematic diagram of CC cross-section structure; Figure 8 It is a structural schematic diagram of a heat dissipation sleeve in a spindle heat dissipation structure disclosed in an embodiment of the present invention; Fig. 9 A bottom view of a heat dissipation shell in a spindle heat dissipation structure disclosed in an embodiment of the present invention; Fig.10 for Fig. 9 DD cross-sectional structure diagram; Fig.11 for Fig. 9 Schematic diagram of EE cross-section structure; Fig.12 A schematic diagram of a partial structure of a spindle heat dissipation structure disclosed in an embodiment of the present invention; Fig.13 The second schematic diagram of the partial structure of an electric spindle disclosed in an embodiment of the present invention; Fig.14 It is a structural schematic diagram of a first fan blade and a second fan blade in a spindle heat dissipation structure disclosed in an embodiment of the present invention.

[0019] Illustration Description: 10. Processing spindle; 11. Mounting cavity; 20. Heat dissipation sleeve; 21. Third cooling channel; 22. First mounting groove; 23. Second mounting groove; 30. heat dissipation shell; 31. first cooling channel; 311. first notch; 312. first opening; 32. second cooling channel; 321. second notch; 322. second opening; 33. first plug; 34. second plug; 35. first interface; 36. second interface; 37. air inlet; 38. air outlet; 40, heat dissipation cover; 41, fourth cooling channel; 411, first flow channel; 412, second flow channel; 413, third flow channel; 50, first fan blade; 51, first impeller; 52, first blade; 521, first through hole; 522, first arc edge; 60, second fan blade; 61, second impeller; 62, second blade; 621, second through hole; 622, second arc edge; 70, first sealing ring; 80, second sealing ring; 90, stator; 100, rotor; 101, rotating shaft; 102, moving iron core; 110, first bearing; 120, second bearing; 130, first mounting cover; 140, second mounting cover; 150, sealing cover; 160, first sleeve; 170, second sleeve; 180, first locking ring; 190, second locking ring; 200, counterweight; 300, clamping assembly; 310, pull rod; 320, chuck; 330, pull rivet; 340, disc spring. DETAILED DESCRIPTION

[0020] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] In the description of the present invention, it should be understood that the terms "upper", "lower", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. It should be noted that when a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centrally arranged component at the same time.

[0022] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0023] The embodiment of the present invention discloses a spindle heat dissipation structure, such as Figure 1-14 As shown, it includes: a machining spindle 10 and a heat dissipation component. The machining spindle 10 is used to install a machining tool. The machining spindle 10 is rotatably embedded in the heat dissipation component. The heat dissipation component is used to dissipate heat from the machining spindle 10: The heat dissipation assembly includes a heat dissipation sleeve 20, which is sleeved on the processing spindle 10. The outer wall of the heat dissipation sleeve 20 is fixedly sleeved with a heat dissipation shell 30, one end of the heat dissipation shell 30 is installed with a heat dissipation cover 40, and one end of the processing spindle 10 passes through the heat dissipation cover 40; a first cooling channel 31 and a second cooling channel 32 are opened through the heat dissipation shell 30, a third cooling channel 21 is provided in the heat dissipation sleeve 20, and a fourth cooling channel 41 is provided in the heat dissipation cover 40; in this embodiment, the heat dissipation shell 30 is penetrated by a fastening screw threadedly connected to the heat dissipation sleeve 20.

[0024] Among them, one end of the third cooling channel 21 and one end of the fourth cooling channel 41 are respectively connected to the first cooling channel 31, and the other end of the third cooling channel 21 and the other end of the fourth cooling channel 41 are respectively connected to the second cooling channel 32, and the first cooling channel 31, the second cooling channel 32, the third cooling channel 21 and the fourth cooling channel 41 are all used to accommodate circulating coolant.

[0025] It should be noted that the spindle heat dissipation structure provided by the present invention specifically includes: a processing spindle 10 and a heat dissipation component, and the heat dissipation component includes a heat dissipation sleeve 20, a heat dissipation shell 30 and a heat dissipation cover 40. By arranging a first cooling channel 31 and a second cooling channel 32 in the heat dissipation shell 30, and interconnecting them with the third cooling channel 21 in the heat dissipation sleeve 20 and the fourth cooling channel 41 in the heat dissipation cover 40, a circulation flow path for the coolant is formed, thereby greatly reducing the risk of uneven heat dissipation of the spindle and ensuring the stability of the temperature distribution of the spindle. In addition, the circulation channel of the coolant covers the heat dissipation component of the entire spindle, reducing the thermal fatigue phenomenon of the material caused by local overheating of the spindle. Therefore, the spindle heat dissipation structure provided by the present invention solves the problem of poor heat dissipation effect of the spindle in the prior art.

[0026] like Figure 3 and Figure 8 As shown, the third cooling channel 21 is arranged in a spiral shape, and the inner wall of the heat dissipation shell 30 is provided with a first notch 311 and a second notch 321, the first notch 311 is connected to the first cooling channel 31, and the second notch 321 is connected to the second cooling channel 32. It should be noted that since the third cooling channel 21 is arranged in a spiral shape, the contact area between the coolant and the heat dissipation sleeve 20 is increased, and the heat exchange efficiency of the coolant is further improved. The spiral design effectively reduces the temperature rise of the processing spindle 10 and ensures the temperature stability of the spindle during high-speed processing.

[0027] like Figure 3-11 As shown, the outer wall of the heat dissipation shell 30 is provided with a first opening 312 corresponding to the first notch 311 and a second opening 322 corresponding to the second notch 321; a first plug 33 is installed at the first opening 312, and a second plug 34 is installed at the second opening 322. In this embodiment, the heat dissipation shell 30 is provided with a first interface 35 and a second interface 36, the first interface 35 is connected to the first cooling channel 31, and the second interface 36 is connected to the second cooling channel 32. Through the external first interface 35 and the second interface 36, it is convenient to connect an external circulation pump, so that the coolant circulates in the heat dissipation assembly, better remove the heat generated by the machining spindle 10, and ensure the normal operation of the machining spindle 10.

[0028] It should be noted that, by setting the first notch 311 and the second notch 321 on the inner wall of the heat dissipation shell 30, the coolant can efficiently flow into the first cooling channel 31 and the second cooling channel 32. Through the orderly flow of the coolant between the channels, the overall heat dissipation efficiency is significantly improved. The first opening 312 and the second opening 322 set on the outer wall of the heat dissipation shell 30 are sealed by installing the first plug 33 and the second plug 34 respectively. This design not only ensures the integrity of the cooling channel and the stability of the coolant circulation, but also provides a convenient maintenance method. When the cooling channel needs to be cleaned or repaired, the channel can be easily operated through the opening without disassembling the entire heat dissipation shell 30.

[0029] like Figure 3-11 As shown, the first cooling channel 31 and the second cooling channel 32 are arranged in parallel, and both the first cooling channel 31 and the second cooling channel 32 are connected to the end surface of the heat dissipation shell 30 and the heat dissipation cover 40. It should be noted that the parallel arrangement of the cooling channels further optimizes the distribution of the coolant and reduces the resistance loss in the liquid flow. By arranging the first cooling channel 31 and the second cooling channel 32 in parallel, the coolant can perform heat exchange at the interface between the heat dissipation shell 30 and the heat dissipation cover 40 in the shortest path. This design not only improves the cooling efficiency, but also maximizes the cooling capacity in a limited space, which is suitable for the compact design requirements of various processing equipment.

[0030] like Figure 3-7 As shown, the fourth cooling channel 41 includes a first flow channel 411, a second flow channel 412 and a third flow channel 413 which are connected in sequence, the first flow channel 411 is arranged in an arc shape, and the second flow channel 412 and the third flow channel 413 are arranged in a long strip shape; in this embodiment, the number of the second flow channel 412 and the third flow channel 413 is set to two, and the number of the second flow channel 412 and the third flow channel 413 can also be set to multiple, so that the heat dissipation cover 40 is filled with more coolant, so that the heat dissipation cover 40 can better dissipate heat for the machining spindle 10.

[0031] Among them, one end of the first flow channel 411 is connected to the first cooling channel 31, and the other end of the first flow channel 411 is connected to the second cooling channel 32; the second flow channel 412 is vertically arranged with the third flow channel 413. It should be noted that since one end of the first flow channel 411 is connected to the first cooling channel 31, and the other end of the first flow channel 411 is connected to the second cooling channel 32, it is convenient for the coolant in the heat dissipation cover 40 and the heat dissipation shell 30 to circulate better.

[0032] like Figure 3 , Figure 4 , Fig.13 and Fig.14 As shown, the machining spindle 10 is provided with a first fan blade 50 and a second fan blade 60 which are arranged opposite to each other. The first fan blade 50 includes a first impeller 51, on which three first blades 52 are provided; the second fan blade 60 includes a second impeller 61, on which three second blades 62 are provided; in this embodiment, the first blade 52 is provided with at least one first arc edge 522, and the second blade 62 is provided with at least one second arc edge 622. The blades of the first fan blade 50 are relatively long, and can cover a larger air flow range, thereby achieving efficient primary cooling. The blades of the second fan blade 60 are relatively short, and the air exchange efficiency of the heat dissipation area is accelerated through the secondary airflow, thereby achieving precise local heat dissipation, and further reducing the heat accumulation of the machining spindle 10.

[0033] Among them, the first blade 52 and the second blade 62 are arranged alternately, the inner diameter of the first impeller 51 is larger than the inner diameter of the second impeller 61, and the length of the first blade 52 is larger than the length of the second blade 62; the outer wall of the heat dissipation shell 30 is provided with an air inlet 37 and an air outlet 38, the air inlet 37 is arranged adjacent to the first fan blade 50, and the air outlet 38 is arranged adjacent to the second fan blade 60.

[0034] It should be noted that, due to the staggered arrangement of the first blade 52 and the second blade 62, the airflow of the first blade 52 and the second blade 62 forms an alternating guiding path in structure. In addition, the difference in length and diameter between the first blade 52 and the second blade 62, combined with the reasonable arrangement of the air inlet 37 and the air outlet 38, forms a hierarchical airflow guide, which greatly improves the circulation efficiency of the airflow inside the heat dissipation shell 30 and better dissipates heat for the processing spindle 10. The air inlet 37 and the air outlet 38 arranged on the outer wall of the heat dissipation shell 30 correspond to the adjacent configuration of the first fan blade 50 and the second fan blade 60, respectively, so that the path of the cooling airflow is more direct and clear.

[0035] like Fig.13 and Fig.14As shown, each first blade 52 is provided with at least one first through hole 521, and each second blade 62 is provided with at least two second through holes 621. It should be noted that the first through hole 521 and the second through hole 621 respectively provided on each first blade 52 and the second blade 62 further reduce the resistance to air flow. This design helps the air to flow smoothly on and around the blade surface, avoids the generation of eddy current phenomenon, and improves the heat dissipation efficiency of the first fan blade 50 and the second fan blade 60. In addition, the through holes and arc edge characteristics on the blade design not only optimize the airflow path, but also significantly reduce the wind noise generated during the high-speed rotation of the fan blade, thereby improving the comfort and stability of the equipment operation. The staggered design of the blades and the porous structure of the fan blades can adapt to high-temperature and high-speed processing scenarios, especially under the condition that the processing spindle 10 runs for a long time under high load, which can effectively control the temperature rise of the processing spindle 10 and provide support for high precision and stability of processing.

[0036] like Figure 3 As shown, a first mounting groove 22 is provided at one end of the heat dissipation sleeve 20, and a first sealing ring 70 is sleeved in the first mounting groove 22; a second mounting groove 23 is provided at the other end of the heat dissipation sleeve 20 opposite to the first mounting groove 22, and a second sealing ring 80 is sleeved in the mounting groove. Both the first sealing ring 70 and the second sealing ring 80 are used to seal the heat dissipation sleeve 20 and the heat dissipation shell 30. In this embodiment, the number of the first mounting groove 22, the first sealing ring 70, the second mounting groove 23 and the second sealing ring 80 are all set to two.

[0037] It should be noted that the first mounting groove 22 and the second mounting groove 23 are respectively provided at both ends of the heat dissipation sleeve 20, and are respectively sleeved with the first sealing ring 70 and the second sealing ring 80. This double-end sealing design effectively prevents the leakage of the coolant, and at the same time isolates the pollution of the heat dissipation system by external dust, moisture, etc., ensures the stable operation of the coolant circulation system, and thus improves the reliability of the entire electric spindle system.

[0038] The embodiment of the present invention discloses an electric spindle, such as Figure 1-4As shown, it includes: a stator 90, a rotor 100 and the spindle heat dissipation structure as described above, the positioning and the rotor 100 are both located in the heat dissipation shell 30, and the machining spindle 10, the rotor 100, the stator 90, the heat dissipation sleeve 20 and the heat dissipation shell 30 are nested in sequence; in this embodiment, the entire electric spindle structure realizes the nesting integration of multifunctional components. The machining spindle 10, the rotor 100, the stator 90, the heat dissipation sleeve 20 and the heat dissipation shell 30 are nested in sequence, which optimizes the space utilization rate and further reduces the volume of the equipment, which is suitable for the requirements of compactness and space saving of the equipment in high-precision machining scenarios. The rotor 100 includes a rotating shaft 101, and the rotating shaft 101 is sleeved with a moving iron core 102. The first fan blade 50 and the second fan blade 60 are both sleeved on the rotating shaft 101. By energizing the stator 90, the moving iron core 102 is rotated, driving the rotating shaft 101 to rotate, and then driving the machining spindle 10 to rotate at high speed, thereby driving the tool to perform machining operations.

[0039] A first bearing 110 is sleeved on one end of the machining spindle 10, and a second bearing 120 is sleeved on the other end of the machining spindle 10. A first mounting cover 130 for limiting the installation of the first bearing 110 is fixedly connected to the heat dissipation cover 40. A second mounting cover 140 and a sealing cover 150 are connected to the heat dissipation shell 30 in sequence. The second mounting cover 140 is used for limiting the installation of the second bearing 120.

[0040] like Figure 1-4 As shown, the processing spindle 10 is sleeved with a first sleeve 160 and a second sleeve 170, the first sleeve 160 is in contact with the first bearing 110, and the two second sleeves 170 are distributed at opposite ends of the second bearing 120; in this embodiment, the two ends of the processing spindle 10 are supported by the first bearing 110 and the second bearing 120 respectively, and the first bearing 110 is limited on the heat dissipation cover 40 by the first mounting cover 130, and the second bearing 120 is limited on the heat dissipation shell 30 by the second mounting cover 140 and the sealing cover 150. This multi-layer limiting design greatly improves the running stability of the processing spindle 10, reduces the vibration and offset generated by the processing spindle 10 during high-speed processing, and thus improves the processing accuracy of the processing spindle 10.

[0041] The first locking ring 180 and the second locking ring 190 are threadedly connected on the machining spindle 10, and a counterweight 200 is installed between the second sleeve 170 and the second locking ring 190. It should be noted that the counterweight 200 is locked by the second locking ring 190 at one end of the machining spindle 10 to ensure that the machining spindle 10 can be automatically adjusted when the machining spindle 10 runs at a high speed, and the dynamic balance state of the machining spindle 10 is optimized. The design of the counterweight 200 not only reduces the vibration of the machining spindle 10 during operation, but also further improves the machining quality to meet the requirements of high-speed and high-precision machining.

[0042] In the specific implementation process, Figure 3 As shown, the machining spindle 10 is provided with an installation cavity 11, and the installation cavity 11 is provided with a clamping assembly 300, and the clamping assembly 300 includes a pull rod 310 movably connected to the installation cavity 11, and one end of the pull rod 310 is connected to four chucks 320, and the chucks 320 are connected to pull pins 330, and the pull pins 330 are used to be threadedly connected with the tool handle of the tool; a disc spring 340 for tightening the chuck 320 is installed in the pull rod 310. It should be noted that when the tool needs to be replaced, the pull rod 310 is extended, so that the chuck 320 unlocks the pull pin 330, and the new tool is installed on the pull pin 330, and the chuck 320 locks and clamps the pull pin 330, thereby realizing the tool change process.

[0043] A spindle heat dissipation structure provided by the present invention specifically includes: a processing spindle 10 and a heat dissipation component, wherein the heat dissipation component includes a heat dissipation sleeve 20, a heat dissipation shell 30 and a heat dissipation cover 40. By arranging a first cooling channel 31 and a second cooling channel 32 in the heat dissipation shell 30, and interconnecting them with the third cooling channel 21 in the heat dissipation sleeve 20 and the fourth cooling channel 41 in the heat dissipation cover 40, a circulation flow path of the coolant is formed, thereby greatly reducing the risk of uneven heat dissipation of the spindle and ensuring the stability of the temperature distribution of the spindle. In addition, the circulation channel of the coolant covers the heat dissipation component of the entire spindle, reducing the thermal fatigue of the material caused by local overheating of the spindle. While the processing spindle 10 is rotating, the first fan blade 50 and the second fan blade 60 rotate synchronously. The blade of the first fan blade 50 is longer and can cover a larger airflow range, thereby achieving efficient primary cooling. The blade of the second fan blade 60 is shorter, and the air exchange efficiency of the heat dissipation area is accelerated by the secondary airflow, thereby achieving precise local heat dissipation and further reducing the heat accumulation of the processing spindle 10.

[0044] Therefore, the spindle heat dissipation structure and the electric spindle provided by the present invention solve the problem of poor heat dissipation effect of the spindle in the prior art.

[0045] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A spindle heat dissipation structure, characterized in that: include: A machining spindle (10) and a heat dissipation component, wherein the machining spindle (10) is used to install a machining tool, the machining spindle (10) is rotatably embedded in the heat dissipation component, and the heat dissipation component is used to dissipate heat from the machining spindle (10): The heat dissipation assembly comprises a heat dissipation sleeve (20), the heat dissipation sleeve (20) being sleeved on the processing spindle (10), a heat dissipation shell (30) being fixedly sleeved on the outer wall of the heat dissipation sleeve (20), a heat dissipation cover (40) being installed on one end of the heat dissipation shell (30), and one end of the processing spindle (10) passing through the heat dissipation cover (40); a first cooling channel (31) and a second cooling channel (32) are provided through the heat dissipation shell (30), a third cooling channel (21) is provided in the heat dissipation sleeve (20), and a fourth cooling channel (41) is provided in the heat dissipation cover (40); One end of the third cooling channel (21) and one end of the fourth cooling channel (41) are respectively connected to the first cooling channel (31), and the other end of the third cooling channel (21) and the other end of the fourth cooling channel (41) are respectively connected to the second cooling channel (32), and the first cooling channel (31), the second cooling channel (32), the third cooling channel (21) and the fourth cooling channel (41) are all used to accommodate circulating coolant.

2. The spindle heat dissipation structure according to claim 1, characterized in that: The third cooling channel (21) is arranged in a spiral shape, and the inner wall of the heat dissipation shell (30) is provided with a first notch (311) and a second notch (321), the first notch (311) is connected to the first cooling channel (31), and the second notch (321) is connected to the second cooling channel (32).

3. The spindle heat dissipation structure according to claim 2, characterized in that: The outer wall of the heat dissipation shell (30) is provided with a first opening (312) corresponding to the first notch (311) and a second opening (322) corresponding to the second notch (321); A first plug (33) is installed at the first opening (312), and a second plug (34) is installed at the second opening (322).

4. The spindle heat dissipation structure according to claim 3, characterized in that: The first cooling channel (31) and the second cooling channel (32) are arranged in parallel, and both the first cooling channel (31) and the second cooling channel (32) pass through an end surface of the heat dissipation shell (30) in contact with the heat dissipation cover (40).

5. The spindle heat dissipation structure according to any one of claims 1 to 4, characterized in that: The fourth cooling channel (41) comprises a first flow channel (411), a second flow channel (412) and a third flow channel (413) which are connected in sequence, the first flow channel (411) being arranged in an arc shape, and the second flow channel (412) and the third flow channel (413) being arranged in a strip shape; One end of the first flow channel (411) is connected to the first cooling channel (31), and the other end of the first flow channel (411) is connected to the second cooling channel (32); the second flow channel (412) and the third flow channel (413) are arranged vertically.

6. The spindle heat dissipation structure according to any one of claims 1 to 4, characterized in that: The machining spindle (10) is sleeved with a first fan blade (50) and a second fan blade (60) which are arranged opposite to each other, the first fan blade (50) comprising a first impeller (51), the first impeller (51) being provided with three first blades (52); the second fan blade (60) comprising a second impeller (61), the second impeller (61) being provided with three second blades (62); The first blades (52) and the second blades (62) are arranged alternately, the inner diameter of the first impeller (51) is greater than the inner diameter of the second impeller (61), and the length of the first blade (52) is greater than the length of the second blade (62); an air inlet (37) and an air outlet (38) are provided on the outer wall of the heat dissipation shell (30), the air inlet (37) is arranged adjacent to the first fan blade (50), and the air outlet (38) is arranged adjacent to the second fan blade (60).

7. The spindle heat dissipation structure according to claim 6, characterized in that: Each of the first blades (52) is provided with at least one first through hole (521), and each of the second blades (62) is provided with at least two second through holes (621).

8. The spindle heat dissipation structure according to claim 1, characterized in that: A first installation groove (22) is provided at one end of the heat dissipation sleeve (20), and a first sealing ring (70) is sleeved in the first installation groove (22); The other end of the heat dissipation sleeve (20) is provided with a second mounting groove (23) arranged opposite to the first mounting groove (22), a second sealing ring (80) is sleeved in the mounting groove, and the first sealing ring (70) and the second sealing ring (80) are both used to seal the heat dissipation sleeve (20) and the heat dissipation shell (30).

9. An electric spindle, characterized in that: include: A stator (90), a rotor (100), and a spindle heat dissipation structure according to any one of claims 1 to 8, wherein the positioning and the rotor (100) are both located in the heat dissipation shell (30), and the machining spindle (10), the rotor (100), the stator (90), the heat dissipation sleeve (20), and the heat dissipation shell (30) are nested in sequence with each other; A first bearing (110) is sleeved on one end of the machining spindle (10), and a second bearing (120) is sleeved on the other end of the machining spindle (10); a first mounting cover (130) for limiting the installation of the first bearing (110) is fixedly connected to the heat dissipation cover (40); a second mounting cover (140) and a sealing cover (150) are sequentially connected to the heat dissipation shell (30); the second mounting cover (140) is used for limiting the installation of the second bearing (120).

10. The electric spindle according to claim 9, characterized in that: A first sleeve (160) and a second sleeve (170) are sleeved on the machining spindle (10), the first sleeve (160) abuts against the first bearing (110), and two second sleeves (170) are distributed at opposite ends of the second bearing (120); The machining spindle (10) is threadedly connected to a first locking ring (180) and a second locking ring (190), and a counterweight (200) is installed between the second sleeve (170) and the second locking ring (190).

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