An electric spindle spindle assembly and an electric spindle

Abstract

This invention provides an electric spindle core assembly and an electric spindle. The core assembly includes a core, a tie rod assembly, and a drive mechanism. A through cavity is provided within the core along its axial direction. The tie rod assembly is at least partially disposed within the through cavity and is capable of telescopic movement along the axial direction of the core. One end of the tie rod assembly is connected to a baffle jaw, and the other end of the tie rod assembly abuts against the drive mechanism. The drive mechanism can drive the tie rod assembly to move along the axial direction of the core, thereby causing the baffle jaw to extend out of the end face of the core, thus achieving tool unloading. The tie rod assembly has a segmented structure. Using the above solution, the first-order bending mode of the tie rod assembly within the through cavity can be effectively improved, reducing the tie rod's flexibility and making it less susceptible to imbalance, reducing the factors affecting chatter during head tool machining, and ensuring the machining accuracy and reliability of the electric spindle.

Description

Technical Field

[0001] This invention belongs to the technical field of electric spindle core assembly, specifically relating to an electric spindle core assembly and an electric spindle. Background Technology

[0002] The existing manufacturing industry is gradually replacing manual and manual manufacturing with intelligent products and mechanical equipment. This includes the widespread use of modern CNC machine tools and machining centers. As a core component of machining centers, electric spindles are currently the main focus of intelligent equipment products in terms of machining accuracy, high stability, and low vibration.

[0003] In existing electric spindle products, the broach assembly in the spindle core is mainly used to load and unload tools for different machining methods in CNC machine tools. Since the broach assembly needs to run through the entire spindle core, it is generally designed to be slender and elongated according to the spindle dimensions. However, based on vibration and modal studies of existing electric spindles, the slender broach assembly makes it the first modal resonance point of the entire electric spindle. Its first bending modal frequency (around 300Hz) is relatively low, which has a certain impact on the noise and vibration of the entire electric spindle. Moreover, this vibration will further affect the machining accuracy of the tool at the spindle head, making it prone to chatter during machining, which seriously affects the quality of the machined workpiece. At the same time, due to the slender structure of the broach assembly, its overall flexibility is relatively large, and the electric spindle will be more affected by imbalance during operation, further exacerbating the instability of the electric spindle machining. Long-term operation may seriously affect the machining life of the electric spindle.

[0004] Given the technical problems existing in the electric spindles mentioned above, there are currently no relevant solutions; therefore, there is an urgent need to find effective solutions to address these issues. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of the above-mentioned technologies by proposing an electric spindle core assembly and an electric spindle, aiming to solve one of the problems of chatter and poor stability that occur easily during machining in existing electric spindle core assemblies or electric spindles.

[0006] This invention provides an electric spindle core assembly, which includes a spindle core, a pull rod assembly, and a drive mechanism. The spindle core has a through cavity along its axial direction. The pull rod assembly is at least partially disposed within the through cavity and is capable of telescopic movement along the axial direction of the spindle core. One end of the pull rod assembly is connected to a cutter claw, and the other end of the pull rod assembly abuts against the drive mechanism. The drive mechanism can drive the pull rod assembly to move along the axial direction of the spindle core, thereby causing the cutter claw to extend out of the end face of the spindle core, thus achieving cutter removal. The pull rod assembly has a segmented structure.

[0007] Furthermore, the pull rod assembly is equipped with an elastic reset mechanism; the elastic reset mechanism can cause the pull rod assembly to drive the cutter claw to retract into the shaft core when the drive mechanism and the pull rod assembly are separated, thereby realizing the cutter.

[0008] Furthermore, the segmented structure includes a pull rod and an adapter. The pull rod is disposed within the through cavity. The shaft core has a rear end cap at its other end, which is fixedly connected to the open side of the other end of the through cavity. One end of the adapter passes through the rear end cap of the shaft core and extends into the through cavity, thereby abutting or connecting with one end of the pull rod. The other end of the adapter abuts against the drive mechanism. The adapter can extend and retract on the rear end cap of the shaft core. The drive mechanism can drive the pull rod to move axially along the shaft core by driving the adapter.

[0009] Furthermore, a high-pressure oil section is provided in the cavity between the adapter and the pull rod, and the high-pressure oil section can reciprocate within the cavity; the high-pressure oil section is elastically connected to the shaft core, and high-pressure oil is sealed inside the high-pressure oil section; the adapter can drive the high-pressure oil section to move along the axial direction of the shaft core, thereby driving the pull rod to move.

[0010] Furthermore, a puller nut is provided at one end of the adapter extending from the rear end cover of the shaft core, and the adapter abuts against the drive mechanism through the puller nut; an elastic component is provided at one end of the adapter extending from the rear end cover of the shaft core, one end of the elastic component is connected to the outer side wall of the rear end cover of the shaft core, and the other end of the elastic component is connected to the puller nut; when the puller nut is separated from the drive mechanism, the elastic component can drive the adapter to move towards the drive mechanism; when the drive mechanism drives the puller nut to move towards the pull rod end, the puller nut compresses the elastic component.

[0011] Furthermore, a first sealing gasket is provided at one end of the high-pressure oil section, and a second sealing gasket is provided at the other end of the high-pressure oil section. The high-pressure oil seal is located between the first sealing gasket and the second sealing gasket. The first sealing gasket is connected to or abuts against one end of the pull rod, and the second sealing gasket is connected to or abuts against one end of the adapter.

[0012] Furthermore, the adapter has a puller nut at one end extending from the rear end cover of the shaft core. One end of the adapter abuts against the drive mechanism via the puller nut, and the other end of the adapter is connected to one side of the second sealing gasket. The adapter has an elastic component at one end located in the cavity. One end of the elastic component is connected to the inner wall of the rear end cover of the shaft core, and the other end of the elastic component is connected to the second sealing gasket. When the puller nut is separated from the drive mechanism, the elastic component can drive the adapter to move towards the drive mechanism via the second sealing gasket. When the drive mechanism drives the puller nut to move towards the pull rod end, the adapter pushes the second sealing gasket to stretch the elastic component.

[0013] Furthermore, the segmented structure includes a pull rod and a cutter adapter rod. The pull rod is disposed within the through cavity. The shaft core has a shaft core rear end cover at its other end, which is fixedly connected to the open side of the other end of the through cavity. One end of the cutter adapter rod passes through the shaft core rear end cover and extends into the through cavity, thereby abutting against one end of the pull rod. The other end of the cutter adapter rod abuts against the drive mechanism. The cutter adapter rod can extend and retract on the shaft core rear end cover. The drive mechanism can drive the pull rod to move axially along the shaft core by driving the cutter adapter rod.

[0014] Furthermore, a puller nut is provided at one end of the puller adapter rod extending out of the rear end cover of the shaft core, and the puller adapter rod abuts against the drive mechanism through the puller nut; an elastic component is provided at one end of the puller adapter rod located in the through cavity, one end of the elastic component is connected to the inner side wall of the rear end cover of the shaft core, and the other end of the elastic component is connected to the puller adapter rod; when the puller nut and the drive mechanism are separated, the elastic component can drive the puller adapter rod to move towards the drive mechanism.

[0015] Furthermore, a puller nut is provided at one end of the puller adapter rod extending from the rear end cover of the shaft core, and the puller adapter rod abuts against the drive mechanism through the puller nut; an elastic component is provided at one end of the puller adapter rod extending from the rear end cover of the shaft core, one end of the elastic component is connected to the outer side wall of the rear end cover of the shaft core, and the other end of the elastic component is connected to the puller nut; when the puller nut is separated from the drive mechanism, the elastic component can drive the puller adapter rod to move towards the drive mechanism; when the drive mechanism drives the puller nut to move towards one end of the puller rod, the puller nut compresses the elastic component.

[0016] Furthermore, the elastic reset mechanism includes a disc spring, and the segmented structure includes a pull rod, which is disposed in the through cavity; the disc spring is sleeved on the pull rod, and one end of the disc spring abuts against one end of the pull rod, while the other end of the disc spring abuts against the inner wall of the through cavity; in its natural state, the disc spring can drive the pull rod to move towards the drive mechanism, thereby causing the puller claw to retract into the shaft core.

[0017] Furthermore, the shaft core assembly includes a bushing rear end cover, which is disposed on the side of the shaft core located in the drive mechanism; the drive mechanism includes a piston and a pull-out cutter cylinder; the pull-out cutter cylinder is sealed on the bushing rear end cover and forms an oil chamber with the pull-out cutter cylinder; one end of the piston is disposed in the oil chamber and seals and divides the oil chamber into a first oil chamber and a second oil chamber; the other end of the piston passes through the bushing rear end cover and abuts against the pull rod assembly; the piston can be driven to move towards one end of the pull rod assembly by filling the first oil chamber with high-pressure oil, thereby driving the pull rod assembly to move; the piston can be driven to move away from one end of the pull rod assembly by filling the second oil chamber with high-pressure oil, thereby causing the piston and the pull rod assembly to separate from each other.

[0018] Accordingly, the present invention also provides an electric spindle, including an electric spindle core assembly, wherein the electric spindle core assembly is the electric spindle core assembly described above.

[0019] Accordingly, in conjunction with the above solutions, the present invention also provides an electric spindle, including an electric spindle core assembly, wherein the electric spindle core assembly is the electric spindle core assembly described above.

[0020] The electric spindle core assembly and electric spindle proposed in this invention have the following technical advantages:

[0021] First, the tie rod assembly adopts a segmented design, using only the length of the tie rod section to improve the tie rod stiffness, increase the tie rod modal frequency, and effectively reduce the problem of excessive vibration caused by the modal resonance of the electric spindle tie rod;

[0022] Secondly, the tie rod assembly adopts a segmented design to shorten the tie rod and reduce its flexibility, making it less susceptible to the influence of imbalance. This reduces the factors that cause chatter during head tool machining, ensuring the machining accuracy and reliability of the electric spindle.

[0023] Third, the tie rod assembly is designed with a high-pressure oil section, which is elastically connected to the shaft core only, thereby reducing the modal coupling effect between the tie rod and the shaft core;

[0024] Fourth, the tie rod assembly is designed with a high-pressure oil section to provide greater damping for the spindle system assembly, thereby reducing the transmission of spindle vibration and increasing the machining accuracy of the electric spindle head tool. Attached Figure Description

[0025] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0026] The present invention will be further described below with reference to the accompanying drawings:

[0027] Figure 1 This is a schematic diagram of an embodiment of an electric spindle core assembly according to the present invention;

[0028] Figure 2 This is a cross-sectional view of the broaching completion state of a second embodiment of the electric spindle core assembly of the present invention;

[0029] Figure 3 This is a cross-sectional view of the tool unloading completed state of a second embodiment of an electric spindle core assembly according to the present invention;

[0030] Figure 4 This is a cross-sectional view of a third embodiment of an electric spindle core assembly according to the present invention;

[0031] Figure 5 This is a cross-sectional view of a fourth embodiment of an electric spindle core assembly according to the present invention.

[0032] In the diagram: 1. Shaft core; 2. Tie rod assembly; 201. Rear end face of tie rod assembly; 3. Disc spring; 4. Broach claw; 5. High-pressure oil; 6. Elastic component; 7. Rear end cover of shaft core; 8. Broach nut; 9. Piston; 901. First oil chamber; 902. Second oil chamber; 10. Rear end cover of bushing; 11. Broach release cylinder; 12-1. First sealing gasket; 12-2. Second sealing gasket; 13. Adapter; 14. Broach adapter rod; 15. Front end face. Detailed Implementation

[0033] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0034] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. "Several" means one or more, unless otherwise explicitly specified.

[0036] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0037] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0038] like Figures 1 to 5 As shown, the present invention provides an electric spindle core assembly, the core assembly including a core 1, a pull rod assembly, and a drive mechanism; wherein, the core 1 has a through cavity along its axial direction to accommodate the pull rod assembly; specifically, the pull rod assembly is at least partially disposed in the through cavity and can extend and retract along the axial direction of the core 1 within the through cavity, thereby realizing the tool drawing and unloading operations; further, one end of the pull rod assembly is connected to a tool drawing claw 4, and the other end of the pull rod assembly abuts against the drive mechanism; specifically, the drive mechanism can drive the pull rod assembly to move along the axial direction of the core 1, thereby causing the tool drawing claw 4 to extend out of the end face of the core, thereby realizing tool unloading; furthermore, as an important aspect of this application... The inventive concept involves a segmented structure for the tie rod assembly, comprising multiple components connected in series to form the tie rod assembly. This design effectively improves the first-order bending mode of the tie rod assembly within the cavity, thereby reducing its impact on the electric spindle vibration and improving the machining accuracy of the electric spindle broach head. Furthermore, the segmented structure shortens the tie rod, reducing its flexibility and making it less susceptible to imbalances. This reduces factors influencing chatter during machining, ensuring the machining accuracy and reliability of the electric spindle and extending its lifespan.

[0039] Preferably, in combination with the above schemes, such as Figures 1 to 5 As shown, as a design concept of the present invention, the pull rod assembly is provided with an elastic reset mechanism, which can also be set in the through cavity to realize its reset driving function; specifically, when the drive mechanism and the pull rod assembly are separated, the elastic reset mechanism can cause the pull rod assembly to drive the pull cutter claw 4 to retract into the shaft core 1 (i.e., retract into the through cavity), thereby realizing the pull cutter.

[0040] Preferably, in combination with the above schemes, such as Figures 1 to 5 As shown, the segmented structure includes a pull rod 2 and an adapter 13. The pull rod 2 is disposed in the cavity and can be directly or indirectly connected to the adapter 13 to achieve transmission. Further, the shaft core 1 has a shaft core rear end cover 7 at its other end, which is fixedly connected to the opening side of the other end of the cavity and seals the opening at the other end of the cavity. Further, one end of the adapter 13 passes through the shaft core rear end cover 7 and extends into the cavity, thereby abutting or connecting with one end of the pull rod 2. The other end of the adapter 13 abuts against the drive mechanism and can achieve transmission. Further, the adapter 13 can extend and retract on the shaft core rear end cover 7, thereby pushing the pull rod 2 to move. With the above structural design, the drive mechanism can drive the pull rod 2 to move axially along the shaft core 1 by driving the adapter 13, and then the pull rod 2 pushes the cutter claw 4 to extend out of the end face of the shaft core, thereby realizing the unloading of the cutter.

[0041] Preferably, the above-described scheme is used as an embodiment of this application, such as... Figures 2 to 3 As shown, a high-pressure oil section is provided in the cavity of the spindle core 1 between the adapter 13 and the pull rod 2. This high-pressure oil section is sealed with high-pressure oil 5 and can reciprocate within the cavity, thus achieving transmission. Specifically, by providing a high-pressure oil section between the adapter 13 and the pull rod 2, the axial propulsion and retraction of the pull rod 2 are achieved using this sealed high-pressure oil section. This design of the high-pressure oil section increases the bending mode frequency of the pull rod assembly, reduces its flexibility, and provides high damping, resulting in greater damping in the spindle core and reduced vibration transmission. This makes the electric spindle system more stable and reliable, ensuring the machining accuracy of the head tool. Furthermore, the high-pressure oil section and the spindle core 1 are elastically connected, thereby reducing the modal coupling effect between the pull rod and the spindle core. Furthermore, the adapter 13 can drive the high-pressure oil section to move axially along the spindle core 1, thereby moving the pull rod 2.

[0042] Preferably, the above-described scheme is used as an embodiment of this application, such as... Figures 2 to 3 As shown, one end of the adapter 13 extending from the rear end cover 7 of the shaft core is provided with a puller nut 8, allowing the adapter 13 to abut against the drive mechanism via the puller nut 8. This abutment method between the puller nut 8 and the drive mechanism enables transmission, allowing the drive mechanism to move only the pull rod assembly for tool unloading, increasing the bending mode frequency of the entire pull rod assembly, reducing its flexibility, and increasing its damping. Furthermore, as... Figure 4 As shown, the adapter 13 has an elastic component 6 at one end extending from the rear end cover 7 of the shaft core. One end of the elastic component 6 is connected to the outer wall of the rear end cover 7 of the shaft core, and the other end of the elastic component 6 is connected to the pull nut 8, thereby realizing buffering and reset operations. Specifically, when the pull nut 8 is separated from the drive mechanism, the elastic component 6 can drive the adapter 13 to move towards the drive mechanism side, thereby resetting the adapter 13. When the drive mechanism drives the pull nut 8 to move towards the pull rod 2, the pull nut 8 compresses the elastic component 6. At this time, the elastic component 6 can play a buffering role and increase the damping of the pull rod assembly.

[0043] Preferably, in combination with the above schemes, such as Figures 2 to 3As shown, a first sealing gasket 12-1 is provided at one end of the high-pressure oil section, and a second sealing gasket 12-2 is provided at the other end of the high-pressure oil section. Specifically, the high-pressure oil 5 is sealed between the first sealing gasket 12-1 and the second sealing gasket 12-2, and the first sealing gasket 12-1 and the second sealing gasket 12-2 can reciprocate within the cavity. Furthermore, the first sealing gasket 12-1 is connected to or abuts against one end of the pull rod 2, and is completely and tightly connected. Furthermore, the second sealing gasket 12-2 is connected to or abuts against one end of the adapter 13, and is completely and tightly connected, both of which can realize transmission. Furthermore, the first sealing gasket 12-1 and one end of the pull rod 2 are... The first sealing gasket 12-2 and one end of the adapter 13 are integral structures; or the first sealing gasket 12-1 and one end of the pull rod 2 may be in contact but not connected. In this case, the position of the first sealing gasket 12-1 needs to be constrained by the disc spring and the axial force of the hydraulic oil section. The main function of the elastic component 6 is to provide a certain damping effect so that the first sealing gasket 12-1 and the second sealing gasket 12-2 move slowly and the pressure of the high-pressure oil section changes slowly. This avoids the disc spring driving the first sealing gasket 12-1 to move instantaneously, causing an instantaneous change in the pressure of the high-pressure oil section, or the piston driving the second sealing gasket 12-2 to move instantaneously, causing an instantaneous change in the sealing pressure.

[0044] Preferably, in combination with the above schemes, such as Figures 2 to 3 As shown, one end of the adapter 13 extending out of the rear end cover 7 of the shaft core is provided with a puller nut 8. One end of the adapter 13 abuts against the drive mechanism through the puller nut 8, and the other end of the adapter 13 is connected to one side of the second sealing gasket 12-2. Further, one end of the adapter 13 located in the cavity is provided with an elastic component 6. One end of the elastic component 6 is connected to the inner side wall of the rear end cover 7 of the shaft core, and the other end of the elastic component 6 is connected to the second sealing gasket 12-2. When the puller nut 8 is separated from the drive mechanism, the elastic component 6 can drive the adapter 13 to move towards the drive mechanism through the second sealing gasket 12-2, thereby realizing the reset of the adapter 13. When the drive mechanism drives the puller nut 8 to move towards one end of the pull rod 2, the adapter 13 pushes the second sealing gasket 12-2 to stretch the elastic component 6, that is, the second sealing gasket 12-2 drives the elastic component 6 to open. At this time, the elastic component 6 can play a buffering role and increase the damping of the pull rod assembly.

[0045] Preferably, in combination with the above schemes, such as Figure 5As shown, in this embodiment, the segmented structure includes a pull rod 2 and a cutter adapter rod 14. The pull rod 2 is telescopically mounted within the cavity. Specifically, the shaft core 1 has a shaft core rear end cover 7 at its other end, which is fixedly connected to the opening side of the other end of the cavity and seals the opening at the other end of the cavity. Specifically, one end of the cutter adapter rod 14 passes through the shaft core rear end cover 7 and extends into the cavity, thereby abutting against one end of the pull rod 2. This allows the pull rod 2 to be pushed during movement, causing the cutter claw 4 to extend out of the end face of the shaft core, thus achieving cutter removal. Furthermore, the other end of the cutter adapter rod 14 abuts against the drive mechanism. Furthermore, the cutter adapter rod 14 can telescopically move on the shaft core rear end cover 7. With the above design, the drive mechanism can drive the pull rod 2 to move axially along the shaft core 1 by driving the cutter adapter rod 14, thereby causing the cutter claw 4 to extend out of the end face of the shaft core, thus achieving cutter removal.

[0046] Preferably, in combination with the above schemes, such as Figure 5 As shown, a puller nut 8 is provided at one end of the puller adapter rod 14 extending out of the rear end cover 7 of the shaft core. The puller adapter rod 14 abuts against the drive mechanism through the puller nut 8. An elastic component 6 is provided at one end of the puller adapter rod 14 located in the through cavity. One end of the elastic component 6 is connected to the inner side wall of the rear end cover 7 of the shaft core, and the other end of the elastic component 6 is connected to the puller adapter rod 14. When the puller nut 8 is separated from the drive mechanism, the elastic component 6 can drive the puller adapter rod 14 to move towards the drive mechanism, thereby realizing the reset of the puller adapter rod 14. In addition, when the drive mechanism drives the puller nut 8 to move towards the pull rod 2, it increases the damping of the pull rod assembly. Alternatively, it plays a buffering role when the elastic reset mechanism drives the pull rod 2 to retract the puller claw 4 into the shaft core 1.

[0047] Preferably, in combination with the above schemes, such as Figure 5 As shown, and with reference Figure 4 The working principle is as follows: the end of the puller adapter rod 14 extending out of the rear end cover 7 of the shaft core is provided with a puller nut 8, and the puller adapter rod 14 abuts against the drive mechanism through the puller nut 8; the end of the puller adapter rod 14 extending out of the rear end cover 7 of the shaft core is provided with an elastic component 6, one end of the elastic component 6 is connected to the outer side wall of the rear end cover 7 of the shaft core, and the other end of the elastic component 6 is connected to the puller nut 8; when the puller nut 8 is separated from the drive mechanism, the elastic component 6 can drive the puller adapter rod 14 to move towards the drive mechanism, realizing the reset of the puller adapter rod 14, and at the same time can play the role of buffering the pull rod 2; when the drive mechanism drives the puller nut 8 to move towards the pull rod 2, the puller nut 8 compresses the elastic component 6, which increases the damping of the pull rod.

[0048] Preferably, in combination with the above schemes, such as Figure 5As shown, the segmented tie rod assembly can be designed with a cutter adapter rod 14. The front end face 15 of the cutter adapter rod 14 and the rear end face of the tie rod 2 are in contact with each other under pressure in the unloading state. In the cutting state, the two ends separate into a small gap state, which does not affect the modal frequency and flexibility of each segment. The shape and axial constraint method of the cutter adapter rod 14 are not restricted. The cutter adapter rod 14 and the shaft core 1 are clearance fit, and partial damping constraint can be provided, so that the modal influence on the shaft core 1 is small.

[0049] Preferably, in combination with the above schemes, such as Figures 1 to 5 As shown, the elastic reset mechanism includes a disc spring 3, and the segmented structure includes a pull rod 2, which is telescopically mounted within the cavity. Specifically, the disc spring 3 is sleeved on the pull rod 2, with one end of the disc spring 3 abutting against one end of the pull rod 2 and the other end abutting against the inner wall of the cavity. Specifically, in its natural state, the disc spring 3 can drive the pull rod 2 to move towards the drive mechanism, thereby causing the cutter claw 4 to retract into the shaft core 1, achieving cutter pulling. It should be noted that during the entire process of the disc spring 3 driving the pull rod 2 to move towards the drive mechanism... In the middle, the elastic components 6 can all play a buffering role; further, it is necessary to consider enhancing the rigidity of the tie rod assembly and to ensure that the tie rod in the spindle can perform the unloading and pulling process normally, that is, to show the connection and constraint relationship of each tie rod assembly component during the pulling and unloading process of the electric spindle; specifically, the middle tie rod 2 can perform axial movement and constraint under the influence of the disc spring 3, and the high-pressure oil 5 forms a high-pressure oil section with the first sealing gasket 12-1 and the second sealing gasket 12-2, which can perform axial movement and constraint under the transmission displacement of the elastic components 6 and the disc spring 3.

[0050] Preferably, in combination with the above schemes, such as Figures 1 to 5As shown, the shaft core assembly includes a bushing rear end cover 10, which is disposed on one side of the shaft core 1 located in the drive mechanism. Specifically, the drive mechanism includes a piston 9 and a pull-out cutter cylinder 11. The pull-out cutter cylinder 11 is sealed on the bushing rear end cover 10 and forms an oil chamber with the pull-out cutter cylinder 11. Further, one end of the piston 9 is disposed in the oil chamber, and the oil chamber is sealed and divided into a first oil chamber 901 and a second oil chamber 902. Further, the other end of the piston 9 passes through the bushing rear end cover 10 and abuts against the pull rod assembly. It should be emphasized that since the pull rod assembly as a whole needs to rotate around its horizontal axis, the pull rod assembly is chosen to abut against the other end of the piston 9. The aforementioned structural design allows for the filling of the first oil chamber 901 with high-pressure oil, thereby driving the piston 9 to move towards one end of the pull rod assembly, which in turn moves the pull rod assembly. Furthermore, by filling the second oil chamber 902 with high-pressure oil, the piston 9 can be driven to move away from the end of the pull rod assembly, thus separating the piston 9 from the pull rod assembly. Specifically, the volume of hydraulic oil in the puller cylinder 11 remains unchanged. The movement of the second sealing gasket 12-2 to the left, due to the incompressibility of the hydraulic oil, simultaneously pushes the first sealing gasket 12-1 to the left, causing the pull rod to move to the left and compressing the disc spring. The puller claw 4 protrudes from the end face of the shaft core 1, thereby achieving tool unloading.

[0051] Preferably, in combination with the above schemes, such as Figure 2 Transformation to Figure 3 As shown, the puller cylinder 11 fills the first oil chamber 901 with high-pressure oil, pushing the piston 9 towards the puller claw 4. The front end of the piston 9 contacts the puller nut 8, and further pushing it compresses the elastic component 6. After the high-pressure oil section moves axially, the pull rod 2 moves axially in sync to further compress the disc spring 3, so that the puller claw 4 protrudes from the end face of the shaft core 1, and the tool can be unloaded.

[0052] Preferably, in combination with the above schemes, such as Figure 3 Transformation to Figure 2 As shown, the puller cylinder 11 fills the second oil chamber 902 with high-pressure oil through the oil passage, pushing the piston 9 forward first and then backward, causing the front end of the piston 9 to separate from the end face of the puller nut 8. The elastic component 6 is no longer under pressure, and thus returns to its normal shape, causing the puller adapter rod 5 to move axially backward. Therefore, the second sealing gasket 12-2 in the high-pressure oil section moves axially synchronously, and the pressure on the first sealing gasket 12-1 gradually decreases. At the same time, the pressure on the disc spring 3 also gradually decreases, returning to its normal shape, so that the pull rod 2 pushes the first sealing gasket 12-1 axially to the high-pressure oil section 5 until it cannot be compressed. Even if the pull rod 2 moves axially backward, the puller claw 4 retracts axially backward into the shaft core 1, thus completing the puller operation.

[0053] Accordingly, in conjunction with the above solutions, the present invention also provides an electric spindle, including an electric spindle core assembly, wherein the electric spindle core assembly is the electric spindle core assembly described above.

[0054] The electric spindle core assembly and electric spindle proposed in this invention have the following technical advantages:

[0055] First, the tie rod assembly adopts a segmented design, using only the length of the tie rod section to improve the tie rod stiffness, increase the tie rod modal frequency, and effectively reduce the problem of excessive vibration caused by the modal resonance of the electric spindle tie rod;

[0056] Secondly, the tie rod assembly adopts a segmented design to shorten the tie rod and reduce its flexibility, making it less susceptible to the influence of imbalance. This reduces the factors that cause chatter during head tool machining, ensuring the machining accuracy and reliability of the electric spindle.

[0057] Third, the tie rod assembly is designed with a high-pressure oil section, which is elastically connected to the shaft core only, thereby reducing the modal coupling effect between the tie rod and the shaft core;

[0058] Fourth, the tie rod assembly is designed with a high-pressure oil section to provide greater damping for the spindle system assembly, thereby reducing the transmission of spindle vibration and increasing the machining accuracy of the electric spindle head tool.

[0059] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the present invention. Any person skilled in the art can make many possible variations and modifications to the technical solution of the present invention, or modify it into equivalent embodiments, without departing from the scope of the present invention. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technology of the present invention without departing from the scope of the present invention are within the protection scope of the present invention.

Claims

1. An electric spindle core assembly, characterized in that, The shaft core assembly includes a shaft core (1), a tie rod assembly, and a drive mechanism; the shaft core (1) has a through cavity along its axial direction; The pull rod assembly is at least partially disposed within the cavity and is capable of telescopic movement along the axial direction of the shaft core (1); one end of the pull rod assembly is connected to a cutter claw (4), and the other end of the pull rod assembly abuts against the drive mechanism; the drive mechanism is capable of driving the pull rod assembly to move along the axial direction of the shaft core (1), thereby causing the cutter claw (4) to extend out of the end face of the shaft core, thereby realizing the unloading of the cutter. The pull rod assembly is provided with an elastic reset mechanism; the elastic reset mechanism can cause the pull rod assembly to drive the cutter claw (4) to retract into the shaft core (1) when the drive mechanism and the pull rod assembly are separated, thereby realizing the cutter pull; The pull rod assembly is a segmented structure, which includes a pull rod (2) and an adapter (13). The pull rod (2) is disposed in the through cavity. One end of the adapter (13) extends into the through cavity and abuts or connects with one end of the pull rod (2), and the other end abuts with the drive mechanism. The drive mechanism can drive the pull rod (2) to move axially along the shaft core (1) by driving the adapter (13). A high-pressure oil section is provided in the cavity between the adapter (13) and the pull rod (2). The high-pressure oil section can reciprocate within the cavity. The high-pressure oil section is elastically connected to the shaft (1). High-pressure oil is sealed in the high-pressure oil section. The adapter (13) can drive the pull rod (2) to move by driving the high-pressure oil section to move along the axial direction of the shaft (1).

2. The electric spindle core assembly according to claim 1, characterized in that, The shaft core (1) has a shaft core rear end cover (7) at its other end, and the shaft core rear end cover (7) is fixedly connected to the opening side of the other end of the cavity; one end of the adapter (13) passes through the shaft core rear end cover (7) and extends into the cavity, thereby abutting or connecting with one end of the pull rod (2); the other end of the adapter (13) abuts with the drive mechanism; the adapter (13) can extend and retract on the shaft core rear end cover (7); the drive mechanism can drive the pull rod (2) to move along the axial direction of the shaft core (1) by driving the adapter (13).

3. The electric spindle core assembly according to claim 2, characterized in that, The adapter (13) has a puller nut (8) at one end extending from the rear end cover (7) of the shaft core. The adapter (13) abuts against the drive mechanism through the puller nut (8). The adapter (13) has an elastic component (6) at one end extending from the rear end cover (7) of the shaft core. One end of the elastic component (6) is connected to the outer wall of the rear end cover (7) of the shaft core, and the other end of the elastic component (6) is connected to the puller nut (8). When the puller nut (8) is separated from the drive mechanism, the elastic component (6) can drive the adapter (13) to move towards the drive mechanism. When the drive mechanism drives the puller nut (8) to move towards the pull rod (2), the puller nut (8) compresses the elastic component (6).

4. The electric spindle core assembly according to claim 3, characterized in that, One end of the high-pressure oil section is provided with a first sealing gasket (12-1), and the other end of the high-pressure oil section is provided with a second sealing gasket (12-2). The high-pressure oil (5) is sealed between the first sealing gasket (12-1) and the second sealing gasket (12-2). The first sealing gasket (12-1) is connected to or abuts against one end of the pull rod (2), and the second sealing gasket (12-2) is connected to or abuts against one end of the adapter (13).

5. The electric spindle core assembly according to claim 4, characterized in that, The adapter (13) has a puller nut (8) at one end extending from the rear end cover (7) of the shaft core. One end of the adapter (13) abuts against the drive mechanism through the puller nut (8), and the other end of the adapter (13) is connected to one side of the second sealing gasket (12-2). The adapter (13) has an elastic component (6) at one end located in the cavity. One end of the elastic component (6) is connected to the inner wall of the rear end cover (7) of the shaft core, and the other end of the elastic component (6) is connected to the second sealing gasket (12-2). When the puller nut (8) is separated from the drive mechanism, the elastic component (6) can drive the adapter (13) to move toward the drive mechanism through the second sealing gasket (12-2). When the drive mechanism drives the puller nut (8) to move toward one end of the pull rod (2), the adapter (13) pushes the second sealing gasket (12-2) to stretch the elastic component (6).

6. An electric spindle, comprising an electric spindle core assembly, characterized in that, The electric spindle core assembly is the electric spindle core assembly as described in any one of claims 1 to 5.

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