An electric spindle

Abstract

The application relates to the technical field of numerical control machining, in particular to an electric spindle, which is characterized in that the electric spindle comprises a shell, a rotating shaft arranged in the shell, a rotor fixed to the rotating shaft, a stator fixed to the inner wall of the shell and corresponding to the rotor, a first cooling cavity between the stator and the shell, a first water inlet and a first water outlet respectively arranged on the shell, the first water inlet and the first water outlet being communicated with the first cooling cavity, a first partition arranged outside the stator, the first partition separating the first cooling cavity into a first cooling channel, the first cooling channel extending from the water inlet to the water outlet, and the first cooling channel guiding the cooling liquid from the first water inlet to the first water outlet. The application can solve the problem of excessive heat generation of the electric spindle, and can realize the functions of intelligent diagnosis, high rigidity and high-speed machining.

Description

Technical Field

[0001] This invention relates to the field of CNC machining technology, and more particularly to an electric spindle. Background Technology

[0002] In some high-end machine tool equipment, the electric spindle is one of the core components, mainly responsible for providing rotational power to drive the cutting tool to perform cutting or milling operations. With the development of technology, the electric spindle has also been gradually optimized and upgraded in terms of high speed, high precision and high efficiency. The electric spindle has become one of the indispensable important components of modern CNC machine tools.

[0003] Typically, in existing technologies, electric spindles mainly consist of a housing, a spindle body, and a drive mechanism. The spindle body is rotatably located inside the housing, while the drive mechanism is located on the housing and connected to the spindle body. Under the drive of the drive mechanism, the spindle body rotates. A clamping mechanism can be installed on the spindle body to clamp the tool, connecting the spindle body to the tool. During the rotation of the spindle body, the tool rotates, thus meeting the cutting requirements.

[0004] However, there is currently an electric spindle structure that integrates the drive mechanism inside the housing, but this structure still suffers from significant heat generation. This heat generation can shorten the lifespan of the electric spindle and affect the overall operating accuracy, leading to machining failure. There is still considerable room for improvement in the existing technology. Summary of the Invention

[0005] This invention provides an electric spindle to solve the problem of excessive heat generation in electric spindles.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] An electric spindle includes a housing and a rotating shaft rotatably disposed inside the housing, and a rotor fixed to the rotating shaft; a stator fixed to the inner wall of the housing and corresponding to the rotor; a first cooling cavity is provided between the stator and the housing; a first water inlet and a first water outlet are respectively provided through the housing, and the first water inlet and the first water outlet are respectively connected to the first cooling cavity; a first partition is provided on the outside of the stator, the first partition dividing the first cooling cavity to form a first cooling channel, the first cooling channel extending from the water inlet to the water outlet, and the first cooling channel guiding coolant from the first water inlet to the first water outlet.

[0008] Preferably, the first separator is spirally arranged and extends from one end of the stator to the other end.

[0009] Preferably, the head of the rotating shaft is rotatably connected to the outer casing via a first bearing assembly, and a second cooling cavity is provided between the first bearing assembly and the outer casing. A second water inlet and a second water outlet are provided through the outer casing, and the second water inlet and the second water outlet are respectively connected to the second cooling cavity.

[0010] Preferably, the first bearing assembly includes a mounting housing fixedly installed inside the outer casing, with a second cooling cavity formed between the mounting housing and the outer casing; and a bearing element fixedly disposed inside the mounting housing, with the rotating shaft connected to the bearing element.

[0011] Preferably, the bearing elements are in two pairs, which are arranged separately within the mounting housing, and a heat dissipation cavity is formed between the two pairs of bearing elements.

[0012] Preferably, a second partition is provided on the outer side of the mounting shell. The second partition extends spirally from one side of the mounting shell to the other side and divides the second cooling cavity to form a second cooling channel. The second cooling channel is used to guide the coolant from the second inlet to the second outlet.

[0013] Preferably, the interior of the outer casing is divided to form a third cooling cavity. One side of the third cooling cavity is adjacent to the first bearing assembly, and the other side of the third cooling cavity is adjacent to the stator and the rotor. The outer casing is provided with a third water inlet and a third water outlet that communicate with the third cooling cavity.

[0014] Preferably, the tail end of the rotating shaft is rotatably connected to the outer casing via a second bearing assembly, the second bearing assembly comprising a plurality of magnetic levitation bearing elements.

[0015] Preferably, a tool runout detection sensor is fixedly mounted on the housing, and the probe of the tool runout detection sensor abuts against the rotating shaft.

[0016] Preferably, a position detection sensor is provided inside the housing, and the position detection sensor is arranged opposite to the rotating shaft.

[0017] Compared with the prior art, the present invention has the following beneficial effects: Under the action of electromagnetic induction, the stator and rotor drive the shaft to rotate. At this time, the stator and rotor will generate a large amount of heat. Based on this, by setting a first cooling cavity between the stator and the housing, and introducing coolant at the first inlet, the coolant flows from one end to the other on the surface of the stator under the guidance of the first partition, and finally flows out from the first outlet, so that the coolant covers the entire stator, thereby cooling the area where the stator and rotor are located, and optimizing and solving the problem of excessive heat generation of the electric spindle. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of the electric spindle provided in Embodiment 1 of the present invention;

[0020] Figure 2 This is a cross-sectional view of the electric spindle provided in Embodiment 1 of the present invention;

[0021] Figure 3 This is a cross-sectional view of the electric spindle provided in Embodiment 1 of the present invention from another perspective;

[0022] Figure 4 This is a cross-sectional view of the electric spindle provided in Embodiment 2 of the present invention.

[0023] Figure label:

[0024] 1. Outer shell; 11. Housing; 111. First water inlet; 112. First water outlet; 113. Second water inlet; 114. Second water outlet; 115. Third water inlet; 12. End cap; 2. Rotating shaft; 3. Drive assembly; 31. Stator; 311. First separator; 32. Rotor; 4. Cutting mechanism; 5. Cutting cylinder;

[0025] 6. First cooling cavity; 7. First bearing assembly; 71. Mounting housing; 711. Second separator; 72. Bearing element; 8. Second cooling cavity; 9. Third cooling cavity; 10. Second bearing assembly; 101. Tool data reading sensor; 102. Position detection sensor; 103. Tool runout detection sensor; 104. Outer ring; 105. Inner ring; 106. Sealing ring; 107. First sealing ring; 108. Second sealing ring. Detailed Implementation

[0026] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0027] In the description of this invention, it should be understood that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intermediate component present simultaneously. When a component is considered to be "set" on another component, it can be directly set on the other component or there may be an intermediate component present simultaneously.

[0028] The following is in conjunction with the appendix Figure 1-4 The technical solution of the present invention will be further illustrated through specific embodiments.

[0029] Example 1:

[0030] Please refer to Figure 1 and Figure 2 This invention provides an electric spindle, which mainly includes a housing 1, a rotating shaft 2, a drive assembly 3, a cutting mechanism 4, and a cutting cylinder 5. In this embodiment, the housing 1 serves to provide mounting positions for various components. The housing 1 mainly includes a shell 11 and an end cap 12. The shell 11 has a cylindrical structure, is hollow inside, and has openings at both ends. The end cap 12 covers one end opening of the shell 11. A through hole is provided on the shell 11 for the rotating shaft 2 to pass through. The specific outline of the shell 11 is not described in detail here. For ease of description, the central axis is selected at the rotating shaft 2, and subsequent components are described with reference to this spindle axis.

[0031] Furthermore, to drive the rotating shaft 2 to rotate, in this embodiment, the drive assembly 3 adopts a torque motor structure, which mainly includes a stator 31 and a rotor 32. When installing the torque motor, the stator 31 is first fixedly installed on the inner wall of the housing 11, and then the rotor 32 is fixedly installed on the rotating shaft 2. Steps can be provided on the rotating shaft 2 to facilitate the assembly of the rotor 32. Next, the rotating shaft 2 is rotatably installed on the housing 1, so that the rotor 32 is fitted within the inner edge of the stator 31. At this time, the stator 31 and rotor 32 are positioned opposite each other. By passing current through the stator 31, the rotor 32 is driven to rotate the rotating shaft 2, thereby achieving power output.

[0032] Based on this, the pull-out mechanism 4 is installed on the spindle 2, and the tool-removing cylinder 5 is installed at the end cover 12 and connected to the spindle 2. The pull-out mechanism 4 is a clamping mechanism used on the machine tool spindle. It generates sufficient pulling force through a pre-compressed disc spring and is mainly used to lock the tool holder. The tool-removing cylinder 5 is used to drive the pull-out mechanism 4 to release so as to facilitate tool replacement. The structures of the pull-out mechanism 4 and the tool-removing cylinder 5 are existing technologies and will not be described in detail here.

[0033] With the above settings, the rotation effect of the electric spindle and the tool changing function can be realized. Compared with the conventional motor structure, the torque motor can continue to operate at low speed or even in a stalled state without causing damage to the motor. However, this motor structure has the problem of high heat generation, which can easily affect the overall lifespan and the rotation accuracy of the shaft 2 after long-term operation.

[0034] Continue to refer to Figure 2 To overcome the aforementioned heat dissipation problem, a first groove is recessed at the outer periphery of the stator 31, forming a first cooling cavity 6 between the stator 31 and the outer casing 1. Meanwhile, a first water inlet 111 and a first water outlet 112 are respectively provided through the outer casing 1. The first water inlet 111 and the first water outlet 112 are respectively connected to the first cooling cavity 6 and are respectively close to the two ends of the first cooling cavity 6 in the direction of the main shaft axis.

[0035] At this time, a water-cooled temperature controller is used for cooling. First, the water outlet pipe of the water-cooled temperature controller is fixedly connected to the outer casing 1 and connected to the first water inlet 111. Then, the water inlet pipe of the water-cooled temperature controller is fixedly connected to the outer casing 1 and connected to the first water outlet 112. At this time, the water-cooled temperature controller can press coolant into the first water inlet 111. The coolant flows from one end of the first cooling cavity 6 to the other end of the first cooling cavity 6 and carries away the volume generated by the stator 31 and rotor during operation. Finally, it flows back from the first water outlet 112. Through continuous circulation, the stator 31 and rotor 32 are cooled down, and the heating of the electric spindle is alleviated.

[0036] Furthermore, because the interior of the first cooling cavity 6 is relatively spacious, if coolant is simply introduced through the first inlet 111, turbulence may occur in the first cooling cavity 6, thus affecting the overall heat dissipation efficiency. Based on this, a first partition 311 is integrally connected to the outer circumferential surface of the stator 31. In this embodiment, the first partition 311 has a strip-shaped protrusion outline. The first partition is arranged around the circumference of the stator 31 and extends spirally from one end of the stator 31 to the other end. It should be noted that the end positions of the stator 31 can be regarded as the two opposite ends in the axial direction of the main shaft.

[0037] At this time, the first partition 311 divides the first cooling cavity 6 into a first cooling channel. The first cooling channel is also spirally arranged and extends from the inlet to the outlet. When the coolant enters from the first inlet 111, under the guidance of the first cooling channel, the coolant flows along the spiral trajectory from one end of the stator 31 to the other end and covers the entire circumference until it is guided to the first outlet 112 to achieve backflow. The whole process is orderly and efficient, avoiding the adverse effects on heat dissipation caused by turbulence.

[0038] In other embodiments, the first partition 311 may also adopt a grid-shaped drainage profile. Any partition structure that can guide the water flow and thus allow the coolant to cover the outer periphery of the stator 31 as much as possible can be tried, and will not be described in detail here.

[0039] Reference Figure 2 and Figure 3 When installing the rotating shaft 2, in order to reduce the possibility of shaking or jumping during its rotation, the end of the rotating shaft 2 that is close to the tool and connected to the tool is defined as the head, and the other end is defined as the tail. The head of the rotating shaft 2 is rotatably connected to the housing 1 through the first bearing assembly 7, and the tail of the rotating shaft 2 is rotatably connected to the housing 1 through the second bearing assembly 10.

[0040] Here, because the head of the rotating shaft 2 is closer to the cutting tool, in this embodiment, the first bearing assembly 7 provides higher rotational accuracy support when the head of the rotating shaft 2 is rotated and installed. Specifically, the first bearing assembly 7 includes a mounting shell 71 and a bearing element 72. In this embodiment, the mounting shell 71 has a cylindrical sleeve structure, is hollow inside, and has openings at both ends. The mounting shell 71 is fixedly installed inside the outer shell 1 by an interference fit, or it can be integrally connected to the inside of the outer shell 1. Meanwhile, the bearing element 72 can adopt a ball bearing structure. In other embodiments, other types of bearing structures can also be used, and no specific limitation is made here. At this time, the outer ring 104 of the bearing element 72 is pressed into the interior of the mounting shell 71 by an interference fit or a transition fit, and the bearing element 72 and the mounting shell 71 are installed. Furthermore, one end of the rotating shaft 2 is pressed into the inner ring 105 of the bearing element 72 by an interference fit or a transition fit, and at this time, the head of the rotating shaft 2 is rotated and installed.

[0041] Furthermore, the number of bearing elements 72 can be multiple, such as two, four or eight. In this embodiment, the specific number of bearing elements 72 is four, and the four bearing elements 72 are divided into two pairs, with two of the bearing elements 72 in one pair arranged close to each other. In addition, the two pairs of bearing elements 72 are arranged separately in the mounting housing 71 and are respectively close to both ends of the mounting housing 71.

[0042] Through the above arrangement, on the one hand, the two adjacent bearing elements 72 can provide coaxial compensation at the same rotational connection point of the rotating shaft 2, eliminating the coaxiality error of the rotating shaft 2 itself at that connection point; on the other hand, by adopting two pairs of spaced-apart bearing elements 72, the head of the rotating shaft 2 can be guided to rotate as a whole, thereby eliminating the shaking effect of the coaxiality error on the head area of ​​the rotating shaft 2, resulting in higher rotational accuracy of the head of the rotating shaft 2 and less wobble of the tool during rotation. On the other hand, by distributing the two pairs of bearing elements 72 near both ends of the mounting housing 71, a heat dissipation cavity can be formed between the two pairs of bearing elements 72. During high-speed rotation, heat can be dissipated to the gaps between the bearing elements 72, which is beneficial for structural heat dissipation and reduces the impact of high temperature on the rotation of the rotating shaft 2.

[0043] Continue to refer to Figure 3 During the rotation of the shaft 2, due to the high speed, the bearing element 72 inevitably generates a high amount of heat after long-term operation. Based on this, in order to reduce the heat generated at the head of the shaft 2, a second groove is recessed on the outer side of the mounting shell 71. The second groove is arranged around the outer periphery of the mounting shell 71. When the mounting shell 71 is assembled with the outer shell 1, a second cooling cavity 8 is formed between the first bearing assembly 7 and the outer shell 1. At the same time, a second water inlet 113 and a second water outlet 114 are provided through the outer shell 1. The second water inlet 113 and the second water outlet 114 are respectively connected to the second cooling cavity 8 and are located at both ends of the second cooling cavity 8 in the direction of the main shaft axis.

[0044] At this time, the outer casing 1 can be connected to another interface of the water-cooled temperature controller through a pipe. The water-cooled temperature controller introduces coolant into the second cooling cavity 8 from the second inlet 113. The coolant flows in the second cooling cavity 8 and finally flows out from the second outlet 114, thereby carrying away the heat when the head of the rotating shaft 2 rotates, thus achieving the cooling effect.

[0045] Furthermore, to optimize the cooling effect of the head of the rotating shaft 2, a second partition 711 is provided on the outer side of the mounting shell 71. The arrangement of the second partition 711 is similar to that of the first partition 311. The second partition 711 is integrally connected to the outer side of the mounting shell 71, and the second partition 711 extends from one side of the mounting shell 71 to the other side in a spiral shape. At this time, the second partition 711 divides the second cooling cavity 8 to form a second cooling channel. The two ends of the second cooling channel are connected to the second inlet 113 and the second outlet 114, respectively. The second cooling channel is used to guide the coolant from the second inlet 113 to the second outlet 114.

[0046] With the above configuration, the second partition 711 serves to guide the coolant, allowing the coolant to cover the outer periphery of the mounting shell 71 and achieve a cooling effect. It should be noted that in other embodiments, the second partition 711 can also adopt a grid-shaped flow guide profile. Any structure that can guide the water flow and thus allow the coolant to cover the outer periphery of the mounting shell 71 as much as possible can be tried, and will not be elaborated here.

[0047] Furthermore, in practical applications, the drive assembly 3 is usually close to the bearing element 72. At this time, both the drive assembly 3 and the bearing element 72 will dissipate heat in the process of heat dissipation. On the one hand, the heat will be dissipated towards the outer periphery, and this part of the heat will be absorbed by the coolant in the first cooling cavity 6 and the second cooling cavity 8. On the other hand, the heat dissipated by the drive assembly 3 and the bearing element 72 will also be dissipated along the axial direction of the rotating shaft 2. This part of the heat will accumulate inside the housing 1, which will also affect the overall temperature control effect of the structure, thereby affecting the overall service life and operating accuracy of the electric spindle.

[0048] Specifically, in this embodiment, a third cooling cavity 9 is formed between the drive assembly 3 and the bearing assembly. One side of the third cooling cavity 9 is adjacent to the first bearing assembly 7, and the other side of the third cooling cavity 9 is adjacent to the stator 31 and the rotor 32. A third water inlet 115 and a third water outlet (not shown in the figure) are provided through the outer shell 1. The third water inlet 115 and the third water outlet are simultaneously connected to the third cooling cavity 9.

[0049] Based on this, coolant can be introduced into the third inlet 115 by a water-cooled temperature controller. The coolant fills the third cooling cavity 9 and then flows out from the third outlet to remove the heat output by the drive assembly 3 and bearing element 72 in the axial direction, thereby further optimizing and improving the heat dissipation effect.

[0050] Looking back Figure 2After the head of the rotating shaft 2 is set, the tail of the rotating shaft 2 is rotatably mounted on the housing 1 via the second bearing assembly 10. To minimize noise at the second bearing assembly 10, the second bearing assembly 10 includes several magnetic levitation bearing elements 72. The number of magnetic levitation bearing elements 72 can be one or more, and the number is not specifically limited. In this embodiment, one magnetic levitation bearing element 72 is used, with its inner ring 105 fixedly connected to the rotating shaft 2. Simultaneously, the outer ring 104 of the magnetic levitation bearing element 72 is fixedly connected to the interior of the housing 1. Under the guidance of the magnetic levitation bearing element 72, the rotational noise of the rotating shaft 2 is reduced, and the magnetic levitation bearing element 72 can also achieve high rigidity and high speed, eliminating the imbalance of the rotor 32. Furthermore, because the magnetic levitation bearing element 72 uses non-direct contact rotation, it dissipates less heat, meaning that a water cooling structure can be omitted in the rear section of the electric spindle, allowing the electric spindle to be shorter and more compact.

[0051] Reference Figure 2 During the rotation of the electric spindle, the following problems usually exist. First, there is the problem of tool misinstallation. When the tool is misinstalled, it is easy for the tool to collide, which will damage the structure of the spindle 2. In addition, during the cutting process, the spindle 2 may have axial displacement during the tool's feed. If the axial displacement is too large, it will also have a certain impact on the cutting accuracy. Furthermore, during the long-term rotation of the spindle 2, due to the accumulation of mechanical fatigue, its structure will deform, which will cause the tool to run out of space during rotation. When the tool runs out of space, it will also affect the cutting action.

[0052] Based on this, to solve the problem of misinstalled tools, this embodiment also includes a tool data reading sensor 101. The tool data reading sensor 101 is fixedly installed on the end of the housing 1 near the tool, and the probe of the tool data reading sensor 101 faces the tool. In the specific setup process, the tool data reading sensor 101 can be an RFID sensor. RFID tags can be affixed to different tools in advance, and relevant information can be recorded. The RFID sensor is electrically connected to the receiving end of the PLC controller, and the transmitting end of the PLC controller is electrically connected to the drive component 3. When the RFID sensor scans the RFID tag, the RFID sensor generates a first identification signal and sends the first identification signal to the receiving end of the PLC processor. When the PLC controller receives the first identification signal from the RFID sensor, it will process it. If there is a mismatch in tool information, it will generate a first control signal and send the first control signal to the drive component 3 to control the start and stop of the drive component 3 to avoid the risk of tool collision.

[0053] In addition, to solve the problem of axial displacement of the rotating shaft 2, a position detection sensor 102 is fixedly installed inside the housing 1. In this embodiment, the position detection sensor 102 is close to the rear section of the rotating shaft 2. At the same time, the position detection sensor 102 is arranged opposite to the rotating shaft 2. Correspondingly, the position sensor is electrically connected to the receiving end of the PLC controller. When the rotating shaft 2 generates axial displacement, the position sensor generates a second signal and sends it to the receiving end of the PLC controller. The PLC controller makes a judgment based on the second signal, generates a second control signal, and sends the second control signal to the drive assembly 3 to control the start and stop of the rotating shaft 2, so as to facilitate the operator to inspect the rotating shaft 2.

[0054] In addition, to address the issue of tool runout, a tool runout detection sensor 103 is fixedly installed on the housing 1. The sensor 103 is located at the end of the housing 1 closest to the tool, electrically connected to the receiver of the PLC controller, and its probe abuts against the rotating shaft 2. When the tool runs out of space during rotation, the sensor 103 can detect the runout. When the runout exceeds a preset threshold, a third detection signal is generated and sent to the receiver of the PLC controller. The PLC controller processes the third detection signal and generates a third control signal, which is then transmitted to the drive assembly 3 to control its start and stop. When the drive assembly 3 stops rotating, the operator can perform maintenance on the rotating shaft 2 to prevent tool runout from affecting cutting accuracy, thus achieving intelligent diagnostic functionality.

[0055] The implementation principle of this application embodiment is as follows: During the rotation of the shaft 2, by introducing coolant into the first cooling cavity 6 and the second cooling cavity 8, heat is dissipated from the stator 31 and the rotor 32, and heat is dissipated from the head area of ​​the shaft 2. At the same time, coolant is introduced into the third cooling cavity 9 to further dissipate heat from the electric spindle, thus solving the problem of excessive heat generation of the electric spindle.

[0056] Example 2:

[0057] Based on Embodiment 1, features not explained in this embodiment will be explained using the methods in Embodiment 1, and will not be repeated here. The difference between this embodiment and Embodiment 1 is that the structure of the first cooling cavity 6 is different.

[0058] Among them, reference Figure 4In Embodiment 1, during the heat dissipation process of the stator 31 and rotor 32, the first cooling cavity 6 only stays on the outer peripheral surface, and there is still room for further improvement in heat dissipation efficiency. In this embodiment, the number of first cooling cavities 6 is set to two layers, one layer is located in the original position, and the other layer of first cooling cavities 6 is embedded inside the stator 31.

[0059] In addition, the first water inlet 111 is connected to both layers of the first cooling cavity 6, and the first water outlet 112 is connected to both sides of the first cooling cavity 6. The first cooling cavity 6 located in the inner layer is also provided with a first partition 311 arranged in a spiral shape. At this time, under the guiding effect of the two layers of the first cooling cavity 6, the heat dissipation effect of the stator 31 is further optimized and improved.

[0060] It should be explained that the aforementioned heat dissipation structure is mainly set on the frame of the stator 31. When forming the frame of the stator 31, the stator 31 can first be divided into two parts and formed separately. Specifically, the stator 31 can be divided into an outer ring 104 and an inner ring 105 located inside the outer ring 104. First, a groove structure is machined on the outer periphery of the inner ring 105 to form a first cooling cavity 6 located inside the stator 31. In addition, a first groove is set on the outer side of the outer ring 104 to form a first cooling cavity 6 located on the outer side. In this state, the outer ring 104 is fitted onto the outer side of the inner ring 105, and the outer ring 104 and the inner ring 105 are fixed by hot melting or brazing to obtain a double-layer first cooling cavity 6 structure.

[0061] Furthermore, continue to refer to Figure 4 After fixing the outer ring 104 and the inner ring 105, the gap between the outer ring 104 and the inner ring 105 needs to be sealed to prevent coolant from seeping out from between the outer ring 104 and the inner ring 105. Specifically, a sealing ring 106 is fixedly provided at the side end of the outer ring 104 and the inner ring 105. The sealing ring 106 includes a first arm and a second arm that are perpendicular to each other. The first arm covers the connection between the outer ring 104 and the inner ring 105, and a first sealing ring 107 is provided on the inner side of the first arm. Under the action of the first arm and the first sealing ring 107, the connection between the outer ring 104 and the inner ring 105 is sealed to prevent coolant from seeping out from the connection between the outer ring 104 and the inner ring 105.

[0062] Furthermore, the second arm is attached to the outer peripheral surface of the frame, and the second arm just covers the connection between the housing 11 and the end cap 12. At this time, a second sealing ring 108 is fixedly installed on the outside of the second arm. Here, the second arm can just seal the connection seam between the housing 11 and the end cap 12, and the overall sealing performance of the structure is guaranteed.

[0063] The implementation principle of this application embodiment is as follows: by setting a two-layer first cooling cavity 6 structure, the heat dissipation effect of the electric spindle is further optimized and improved. At the same time, under the sealing effect of the sealing ring 106, the overall sealing performance of the structure is improved, the coolant is not easy to leak out, and the structure has good stability.

[0064] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An electric spindle, comprising a housing (1) and a rotating shaft (2) rotatably disposed inside the housing (1), characterized in that, Also includes Rotor (32), fixed to the rotating shaft (2); The stator (31) is fixed to the inner wall of the outer shell (1) and corresponds to the rotor (32). A first cooling cavity (6) is provided between the stator (31) and the outer shell (1). A first water inlet (111) and a first water outlet (112) are respectively provided through the outer shell (1). The first water inlet (111) and the first water outlet (112) are respectively connected to the first cooling cavity (6). The stator (31) is provided with a first partition (311) on the outside. The first partition (311) divides the first cooling cavity (6) to form a first cooling channel. The first cooling channel extends from the first water inlet (111) to the first water outlet (112). The first cooling channel guides the coolant from the first water inlet (111) to the first water outlet (112). The head of the rotating shaft (2) is rotatably connected to the outer shell (1) through the first bearing assembly (7). There is a second cooling cavity (8) between the first bearing assembly (7) and the outer shell (1). A second water inlet (113) and a second water outlet (114) are provided through the outer shell (1). The second water inlet (113) and the second water outlet (114) are respectively connected to the second cooling cavity (8). The first bearing assembly (7) includes a mounting shell (71) which is fixedly installed inside the outer shell (1), and a second cooling cavity (8) is formed between the mounting shell (71) and the outer shell (1); The mounting housing (71) is provided with a second partition (711) on the outside. The second partition (711) extends from one side of the mounting housing (71) to the other side in a spiral shape and divides the second cooling cavity (8) to form a second cooling channel. The second cooling channel is used to guide the coolant from the second inlet (113) to the second outlet (114). The outer casing (1) is divided to form a third cooling cavity (9). One side of the third cooling cavity (9) is adjacent to the first bearing assembly (7), and the other side of the third cooling cavity (9) is adjacent to the stator (31) and the rotor (32). The outer casing (1) is provided with a third water inlet (115) and a third water outlet communicating with the third cooling cavity (9).

2. The electric spindle according to claim 1, characterized in that, The first separator (311) is spirally arranged and extends from one end of the stator (31) to the other end.

3. The electric spindle according to claim 1, characterized in that, The first bearing assembly (7) further includes a bearing element (72), which is fixedly disposed inside the mounting housing (71), and the rotating shaft (2) is connected to the bearing element (72).

4. The electric spindle according to claim 3, characterized in that, The bearing elements (72) are in two pairs, and the two pairs of bearing elements (72) are arranged separately in the mounting housing (71), and a heat dissipation cavity is formed between the two pairs of bearing elements (72).

5. The electric spindle according to claim 1, characterized in that, The tail of the rotating shaft (2) is rotatably connected to the outer casing (1) via a second bearing assembly (10), the second bearing assembly (10) comprising a plurality of bearing elements (72).

6. The electric spindle according to claim 1, characterized in that, A tool runout detection sensor (103) is fixedly installed on the outer shell (1), and the probe of the tool runout detection sensor (103) abuts against the rotating shaft (2).

7. The electric spindle according to claim 1, characterized in that, A position detection sensor (102) is provided inside the outer casing (1), and the position detection sensor (102) is arranged opposite to the rotating shaft (2).

Images