Machine tool spindle

Abstract

The utility model discloses a machine tool spindle which solves the problem that the diameter of a central spindle is large due to the fact that an elastic component is arranged on a pull rod in a sleeving mode and located between the central spindle and the pull rod. A cutter handle installation mechanism is sleeved with a shaft core, a driving mechanism comprises a pull rod forward-moving pushing mechanism and a pull rod backward-moving resetting mechanism, and the pull rod forward-moving pushing mechanism is installed at the rear end of a main shaft body and provided with a pushing component corresponding to the rear end of a pull rod and a pushing driving device. The pull rod backward movement reset mechanism is provided with an elastic component capable of continuously applying elastic force for backward movement to the pull rod, when the driving mechanism operates in the first driving mode, the pushing component moves backwards and is separated from the pull rod, and the pull rod axially moves from front to back through the elastic force of the elastic component, and when the driving mechanism operates in the second driving mode, the pushing component is separated from the pull rod. The pushing component moves forwards and pushes the pull rod to move forwards, and the pull rod overcomes the elastic force of the elastic component and axially moves from back to front; the elastic part is arranged on the outer side of the shaft core and located in the rear space of the rear bearing system.

Description

Technical Field

[0001] The utility model relates to a main shaft of a machine tool. Background Art

[0002] The applicant provides a machine tool spindle in the patent document with publication number CN221620855U, comprising: a spindle body; a spindle motor, the spindle motor includes a motor stator and a motor rotor, the motor stator is fixed in the spindle body, and the motor rotor is adapted to the motor stator; a shaft core, the shaft core is rotatably mounted in the spindle body through a front bearing system and a rear bearing system and rotates with the motor rotor, and a tool holder assembly structure is provided at the front end of the shaft core; a front bearing system, the front bearing system includes a front bearing seat and a front bearing, the front bearing seat is arranged at the front end of the spindle body, the front bearing is installed in the front bearing seat and rotatably supports the front part of the shaft core; a rear bearing system, the rear bearing system includes a rear bearing seat and a rear bearing, the rear bearing seat is arranged at the rear end of the spindle body, the rear bearing is installed in the rear bearing seat and rotatably supports the rear part of the shaft core; a tool holder locking and releasing mechanism, the tool holder locking and releasing mechanism includes an actuator and a driving mechanism, when the driving mechanism operates in a first driving mode, the actuator can lock the tool holder so that the tool holder and the tool holder assembly structure are closely matched, and when the driving mechanism operates in a second driving mode, the actuator can lock the tool holder so that the tool holder and the tool holder assembly structure are closely matched. The mechanism releases the tool handle so that the tool handle can be detached from the tool handle assembly structure; in the tool handle locking and releasing mechanism, the actuator includes a pull rod and a tool handle clamping tensioning and closing component, the tool handle clamping tensioning and closing component is installed at the front end of the pull rod to form a tool handle clamping mechanism, the tool handle clamping mechanism is sleeved in the shaft core, the driving mechanism includes a pull rod forward pushing mechanism and a pull rod backward resetting mechanism, the pull rod forward pushing mechanism is installed at the rear end of the spindle body and has a pushing component corresponding to the rear end of the pull rod and a pushing component for driving the pushing component to move forward The push drive device and the pull rod rearward movement reset mechanism have an elastic component (specifically a rectangular spring sleeved on the rear section of the pull rod) installed between the shaft core and the pull rod and continuously applying elastic force to the pull rod to move backward. When the drive mechanism operates in the first driving mode, the pushing component moves backward and disengages from the pull rod, and the pull rod moves axially from front to back due to the elastic force of the elastic component. When the drive mechanism operates in the second driving mode, the pushing component moves forward and pushes the pull rod forward, and the pull rod overcomes the elastic force of the elastic component and moves axially from back to front.

[0003] The inventors discovered that in the above-mentioned machine tool spindle, since the elastic component is mounted on the pull rod and is located between the shaft core and the pull rod, space needs to be reserved in the shaft core for installing the elastic component, which results in a larger diameter of the shaft core, and further causes the maximum applicable speed of the front and rear bearings to be reduced due to the larger specifications selected. Utility Model Content

[0004] The purpose of the utility model is to provide an improved machine tool spindle to solve the technical problem that the diameter of the shaft core is larger due to the elastic component being sleeved on the pull rod and located between the shaft core and the pull rod, which in turn leads to a reduction in the maximum applicable speed of the front bearing and the rear bearing due to their larger specifications.

[0005] A machine tool spindle comprises: a spindle body; a spindle motor, the spindle motor comprising a motor stator and a motor rotor, the motor stator being fixed in the spindle body, the motor rotor being adapted to the motor stator; a shaft core, the shaft core being rotatably mounted in the spindle body through a front bearing system and a rear bearing system and rotating with the motor rotor, a tool holder assembly structure being provided at the front end of the shaft core; a front bearing system, the front bearing system comprising a front bearing seat and a front bearing, the front bearing seat being arranged at the front end of the spindle body, the front bearing being mounted in the front bearing seat and rotating with the front bearing. The front part of the shaft core is rotatably supported; a rear bearing system, wherein the rear bearing system includes a rear bearing seat and a rear bearing, wherein the rear bearing seat is arranged at the rear end of the spindle body, and the rear bearing is installed in the rear bearing seat and rotatably supports the rear part of the shaft core; a tool handle locking and releasing mechanism, wherein the tool handle locking and releasing mechanism includes an actuator and a driving mechanism, wherein when the driving mechanism operates in a first driving mode, the actuator can lock the tool handle so that the tool handle and the tool handle assembly structure are tightly matched, and when the driving mechanism operates in a second driving mode, the actuator releases the tool handle so that the tool handle and the tool handle assembly structure are tightly matched. The handle can be detached from the handle assembly structure; in the handle locking and releasing mechanism, the actuator includes a pull rod and a handle mounting structure, the handle mounting structure is arranged at the front end of the pull rod to form a handle mounting mechanism, the handle mounting mechanism is sleeved in the shaft core, the driving mechanism includes a pull rod forward pushing mechanism and a pull rod backward resetting mechanism, the pull rod forward pushing mechanism is installed at the rear end of the spindle body and has a pushing component corresponding to the rear end of the pull rod and a pushing driving device for driving the pushing component to move forward, the pull rod backward The reset mechanism has an elastic component that can continuously apply elastic force to the pull rod to move backward. When the driving mechanism operates in the first driving mode, the pushing component moves backward and disengages from the pull rod, and the pull rod moves axially from front to back due to the elastic force of the elastic component. When the driving mechanism operates in the second driving mode, the pushing component moves forward and pushes the pull rod forward, and the pull rod overcomes the elastic force of the elastic component and moves axially from back to front. The elastic component is arranged on the outside of the shaft core and is located in the rear space of the rear bearing system.

[0006] As an improvement and / or instantiation of the above-mentioned machine tool spindle, further: the elastic component is a spring mounted on the outer wall of the shaft core, the spring is in a compressed state and the rear end thereof presses backward against the rear end flange of the pull rod extending from the rear port of the shaft core.

[0007] As an improvement and / or instantiation of the above-mentioned machine tool spindle, further: the front end of the spring presses forward against the end face of the boss provided on the outer side wall of the shaft core.

[0008] As an improvement and / or instantiation of the above-mentioned machine tool spindle, further: the spring is a rectangular spring.

[0009] As an improvement and / or instantiation of the above-mentioned machine tool spindle, further: the tool holder adopts a spring chuck; the tool holder mounting structure is a threaded structure threadedly connected to the rear end joint of the spring chuck.

[0010] By relocating the elastic component from the interior of the spindle core to the exterior, located within the rearward space of the rear bearing system, the machine tool spindle of this utility model significantly reduces the core diameter. This change not only allows the use of smaller front and rear bearings, thereby increasing the maximum spindle speed and machining efficiency, but also simplifies the core structure, reducing manufacturing complexity and costs. This design also improves the core's heat dissipation and facilitates maintenance of the elastic component.

[0011] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Additional aspects and advantages of the present invention will be partially given in the following description, partially become apparent from the following description, or be learned through practice. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The drawings that constitute part of this specification are used to assist in understanding the present invention. The contents provided in the drawings and the related descriptions in this specification can be used to explain the present invention, but do not constitute an improper limitation on the present invention.

[0013] Figure 1 This is an external structural diagram of a machine tool spindle according to an embodiment of the present utility model.

[0014] Figure 2 for Figure 1 A cross-sectional view of the machine tool spindle is shown. DETAILED DESCRIPTION

[0015] The following is a clear and complete description of the present invention in conjunction with the accompanying drawings. A person skilled in the art will be able to implement the present invention based on these descriptions. Before describing the present invention in conjunction with the accompanying drawings, it should be noted that:

[0016] The technical solutions and technical features provided in each section, including the following description, may be combined with each other unless they conflict. In addition, where possible, these technical solutions, technical features, and related combinations may be assigned specific technical themes and protected by relevant patents.

[0017] The embodiments of the utility model involved in the following description are generally only a part of the embodiments rather than all the embodiments. Based on these embodiments, all other embodiments obtained by ordinary technicians in this field without making any creative work should fall within the scope of patent protection.

[0018] Regarding terms and units in this specification: The terms "include," "comprising," "having," and any variations thereof in this specification, the corresponding claims, and related sections are intended to cover non-exclusive inclusions. Other relevant terms and units are to be reasonably interpreted based on the relevant content provided in this specification.

[0019] Figure 1 This is an external structural diagram of a machine tool spindle according to an embodiment of the present utility model. Figure 2 for Figure 1 The cross-sectional view of the machine tool spindle is shown in FIG. Figure 1-Figure 2The machine tool spindle shown in the figure includes: a spindle body 1; a spindle motor 2, the spindle motor includes a motor stator and a motor rotor, the motor stator is fixed in the spindle body, and the motor rotor is adapted to the motor stator; a shaft core 3, the shaft core is rotatably mounted in the spindle body through a front bearing system and a rear bearing system and rotates with the motor rotor, and a tool holder assembly structure is provided at the front end of the shaft core; a front bearing system 4, the front bearing system includes a front bearing seat and a front bearing, the front bearing seat is arranged at the front end of the spindle body, and the front bearing is installed in the front bearing seat and rotatably supported The front part of the shaft core; a rear bearing system 5, the rear bearing system includes a rear bearing seat and a rear bearing, the rear bearing seat is arranged at the rear end of the spindle body, the rear bearing is installed in the rear bearing seat and rotatably supports the rear part of the shaft core; a tool handle locking and releasing mechanism 6, the tool handle locking and releasing mechanism includes an actuator and a driving mechanism, when the driving mechanism operates in a first driving mode, the actuator can lock the tool handle 7 so that the tool handle and the tool handle assembly structure are closely matched, when the driving mechanism operates in a second driving mode, the actuator releases the tool handle 7 so that the tool handle 7 can be released from the The tool handle assembly structure is disengaged; in the tool handle locking and releasing mechanism, the actuator includes a pull rod 61 and a tool handle mounting structure, the tool handle mounting structure is arranged at the front end of the pull rod 61 to form a tool handle mounting mechanism, the tool handle mounting mechanism is sleeved in the shaft core 3, and the driving mechanism includes a pull rod forward pushing mechanism and a pull rod backward reset mechanism, the pull rod forward pushing mechanism is installed at the rear end of the spindle body 1 and has a pushing component corresponding to the rear end of the pull rod and a pushing driving device for driving the pushing component to move forward, the pull rod backward reset mechanism has a sustainable The elastic component 62 continuously applies elastic force to the pull rod to move backward. When the driving mechanism operates in the first driving mode, the pushing component moves backward and disengages from the pull rod, and the pull rod 61 moves axially from front to back due to the elastic force of the elastic component 62. When the driving mechanism operates in the second driving mode, the pushing component moves forward and pushes the pull rod 61 forward, and the pull rod 61 overcomes the elastic force of the elastic component 62 and moves axially from back to front. The elastic component 62 is arranged on the outside of the shaft core 3 and is located in the rear space of the rear bearing system 5.

[0020] By moving the elastic component 62 from inside the shaft core 3 to outside it, within the space behind the rear bearing system 5, the diameter of the shaft core 3 is significantly reduced. This change not only allows the use of smaller front and rear bearings, thereby increasing the maximum spindle speed and machining efficiency, but also simplifies the structure of the shaft core 3, reducing manufacturing complexity and costs. This design also improves the heat dissipation performance of the shaft core 3 and facilitates maintenance of the elastic component 62.

[0021] In this embodiment, the elastic member 62 is specifically a spring mounted on the outer wall of the shaft core 3. The spring is in a compressed state, with its rear end facing backward against the rear end flange 63 of the pull rod extending from the rear end of the shaft core 3. Furthermore, the front end of the spring faces forward against the end surface of a boss formed on the outer wall of the shaft core. Specifically, the spring is a rectangular spring.

[0022] In this embodiment, the tool handle 7 adopts a spring chuck (the spring chuck is an existing tool handle form, which has a simpler structure and helps to further reduce the diameter of the shaft core 3); the tool handle mounting structure is specifically a threaded structure threadedly connected to the rear end joint of the spring chuck (the threaded structure is located at the front end of the pull rod 61).

[0023] For other details about the machine tool spindle of this embodiment, please refer to the patent document with publication number CN221620855U and other patent application documents previously submitted by the applicant, which will not be repeated here.

[0024] The above describes the relevant contents of the present invention. Based on these descriptions, a person skilled in the art will be able to implement the present invention. Based on the above contents of this specification, all other embodiments obtained by a person skilled in the art without inventive work should fall within the scope of patent protection.

Claims

1. Machine tool spindle, including: Spindle body; A spindle motor, comprising a motor stator and a motor rotor, wherein the motor stator is fixed in the spindle body, and the motor rotor is adapted to the motor stator; A shaft core, the shaft core is rotatably mounted in the spindle body through a front bearing system and a rear bearing system and rotates with the motor rotor, and a tool handle assembly structure is provided at the front end of the shaft core; A front bearing system, comprising a front bearing seat and a front bearing, wherein the front bearing seat is disposed at the front end of the spindle body, and the front bearing is mounted in the front bearing seat and rotatably supports the front portion of the shaft core; A rear bearing system, comprising a rear bearing seat and a rear bearing, wherein the rear bearing seat is disposed at the rear end of the spindle body, and the rear bearing is mounted in the rear bearing seat and rotatably supports the rear portion of the shaft core; a knife handle locking and releasing mechanism, the knife handle locking and releasing mechanism comprising an actuator and a drive mechanism, wherein when the drive mechanism operates in a first driving mode, the actuator can lock the knife handle so that the knife handle and the knife handle assembly structure are tightly fitted, and when the drive mechanism operates in a second driving mode, the actuator can release the knife handle so that the knife handle can be detached from the knife handle assembly structure; In the tool handle locking and releasing mechanism, the actuator includes a pull rod and a tool handle mounting structure, the tool handle mounting structure is arranged at the front end of the pull rod to form a tool handle mounting mechanism, and the tool handle mounting mechanism is sleeved in the shaft core, and the driving mechanism includes a pull rod forward pushing mechanism and a pull rod backward reset mechanism, the pull rod forward pushing mechanism is installed at the rear end of the spindle body and has a pushing component corresponding to the rear end of the pull rod and a pushing driving device for driving the pushing component to move forward, the pull rod backward reset mechanism has an elastic component that can continuously apply elastic force to the pull rod to move backward, when the driving mechanism operates in the first driving mode, the pushing component moves backward and disengages from the pull rod and the pull rod moves axially from front to back due to the elastic force of the elastic component, when the driving mechanism operates in the second driving mode, the pushing component moves forward and pushes the pull rod forward, and the pull rod overcomes the elastic force of the elastic component and moves axially from back to front; The feature of the invention is that the elastic component is arranged outside the shaft core and located in the rear space of the rear bearing system.

2. The machine tool spindle according to claim 1, wherein: The elastic component is a spring sleeved on the outer side wall of the shaft core. The spring is in a compressed state and its rear end presses backward against the rear end flange of the pull rod extending from the rear end of the shaft core.

3. The machine tool spindle according to claim 2, wherein: The front end of the spring presses forward against the end surface of the boss formed on the outer side wall of the shaft core.

4. The machine tool spindle according to claim 2 or 3, characterized in that: The spring is a rectangular spring.

5. The machine tool spindle according to claim 1, wherein: The tool handle adopts a spring chuck; the tool handle mounting structure is a threaded structure threadedly connected to the rear end joint of the spring chuck.

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