A CNC lathe shaft workpiece processing fixture

Abstract

The present invention relates to the technical field of machine tool fixtures, and specifically to a CNC lathe shaft workpiece processing fixture, comprising a three-jaw chuck, wherein the three-jaw chuck comprises a chuck body, a large bevel gear, a small bevel gear, clamping jaws and an auxiliary clamp. The three-jaw chuck clamps the shaft in the radial direction, and while maintaining the basic clamping force, an auxiliary clamp is added inside to further stabilize the clamping effect. As the three-jaw chuck rotates, the centrifugal block in the auxiliary clamp moves along a predetermined path under the action of centrifugal force, thereby driving the internal transmission component to operate, and the transmission component then guides the auxiliary bevel gear to generate a rotational trend tending to tighten the small bevel gear, and then applies a locking effect to the large bevel gear through the small bevel gear, so that the overall structure forms a linked locking effect, thereby solving the problem that the existing three-jaw chuck easily causes the shaft to loosen during low-speed or variable-speed processing.

Description

Technical Field

[0001] The present invention relates to the technical field of machine tool fixtures, in particular to a CNC lathe shaft workpiece processing fixture. Background Art

[0002] With the rapid development of CNC machining technology, CNC lathes are widely used in the field of mechanical manufacturing, especially in the field of high-precision and high-efficiency machining of shaft-like workpieces. In order to achieve rapid positioning and stable clamping of workpieces, three-jaw chucks are commonly used as the mainstream clamping device in existing technology.

[0003] However, three-jaw chucks have significant limitations in practical applications. During high-speed machining of shaft workpieces, the centrifugal force generated by the high rotation interferes with the three-jaw chuck's moving components (such as the slider and jaws), affecting its clamping force on the workpiece. This instability in clamping force becomes increasingly pronounced as spindle speed increases, potentially leading to dangerous workpiece loosening, deflection, or even ejection. This not only impacts machining accuracy and efficiency, but also poses a significant safety hazard.

[0004] In the prior art, for example, a Chinese utility model patent (authorization publication number CN203887252U) discloses a self-clamping three-jaw chuck, which includes a housing, a clamping mechanism, a rubber fixing sleeve, and a rubber fixing sleeve screw. The clamping mechanism is fixed in the housing, and the clamping mechanism is composed of a chuck clamping claw pressure plate, a chuck clamping claw pressure plate screw, a lever, a lever shaft, a return spring, a centrifugal steel ball, a chuck clamping claw, and a lever shaft locking nut.

[0005] The clamping force of the three-jaw chuck is entirely dependent on the centrifugal action of the centrifugal steel balls. When the lathe is started or rotates at low speed (such as when heavy cutting requires speed reduction), insufficient centrifugal force may cause the clamping force to decrease. It is difficult to ensure the stability of the workpiece by relying solely on the interference fit of the rubber fixing sleeve. Summary of the Invention

[0006] In response to the problems existing in the existing technology, a CNC lathe shaft workpiece processing fixture is provided, which clamps the shaft in the radial direction through a three-jaw chuck. While maintaining the basic clamping force, an auxiliary clamp is added inside to further stabilize the clamping effect. As the three-jaw chuck rotates, the centrifugal block in the auxiliary clamp moves along a predetermined path under the action of centrifugal force, thereby driving the internal transmission component to operate. The transmission component then guides the auxiliary bevel gear to produce a rotational trend tending to tighten the small bevel gear, and then applies a locking effect to the large bevel gear through the small bevel gear, so that the overall structure forms a linked locking effect, which solves the problem that the existing three-jaw chuck easily causes the shaft to loosen during low-speed or variable-speed processing.

[0007] In order to solve the problems of the prior art, the present invention provides a CNC lathe shaft workpiece processing fixture, including a three-jaw chuck, the three-jaw chuck includes a chuck body, a large bevel gear, a small bevel gear, a clamping jaw and an auxiliary clamp, the auxiliary clamp including: an auxiliary bevel gear, which is rotatably arranged in the chuck body, coaxially arranged with the large bevel gear, and meshed with at least one of the small bevel gears; a centrifugal block, which is radially slidably arranged in the chuck body, and can generate centrifugal displacement with the rotation of the chuck body; a transmission assembly, which is arranged in the chuck body and connects the centrifugal block and the auxiliary bevel gear, and is used to convert the radial displacement of the centrifugal block into rotational motion of the auxiliary bevel gear; when the chuck body rotation speed exceeds a set threshold, the centrifugal block slides in a direction away from the axis of the chuck body, and guides the auxiliary bevel gear through the transmission assembly to generate a rotational trend tending to tighten the small bevel gear, thereby applying a locking effect to the large bevel gear through the small bevel gear.

[0008] Preferably, the transmission assembly includes a trigger ring, which is slidably arranged in the chuck body along the axial direction of the chuck body, and the trigger ring has an inclined surface that forms contact with the centrifugal block. When the centrifugal block moves away from the axis of the chuck body, the trigger ring moves along its axial direction; an execution ring, which is coaxially connected to the auxiliary bevel gear, and an arc groove is provided on the inner circumferential surface of the execution ring; a guide pin, which is arranged on the trigger ring along the radial direction of the trigger ring, and one end of the guide pin extends into the arc groove and slides with it.

[0009] Preferably, a positioning opening is provided in the chuck body, and the execution ring comprises: a connecting cylinder, which is coaxially rotatably arranged in the positioning opening, and the arc groove is circumferentially distributed on the inner circumferential surface of the connecting cylinder; and a connecting ring, which is coaxially connected to the connecting cylinder and the auxiliary bevel gear.

[0010] Preferably, the chuck body is further provided with an installation cavity close to the positioning port, and the trigger ring comprises: a passive ring, rotatably arranged in the installation cavity, the inner circumference of the passive ring forming an inclined surface cooperating with the centrifugal block; a driving cylinder, coaxially arranged at one end of the passive ring facing the positioning port, and the guide pin is arranged on the driving cylinder.

[0011] Preferably, an elastic reset element is provided between the passive ring and the positioning opening.

[0012] Preferably, the driving cylinder is provided with connecting holes distributed along its circumference, the guide pin is coaxially slidably arranged in the connecting hole, a spring is provided between the guide pin and the inner wall of the installation cavity, and the guide pin abuts against the arc groove.

[0013] Preferably, the passive ring has a conical groove coaxial with the passive ring, and the centrifugal block is in sliding engagement with the conical groove.

[0014] Preferably, the contact surface between the centrifugal block and the tapered groove is provided with an inner ball, and the centrifugal block and the tapered groove are in rolling engagement.

[0015] Preferably, an outer ball is provided between the outer circumferential surface of the passive ring and the inner wall of the installation cavity, and the passive ring and the installation cavity are in rolling engagement.

[0016] Preferably, the chuck body is provided with mounting grooves distributed along its circumference, and the mounting grooves extend along the radial direction of the chuck body.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] This application utilizes a three-jaw chuck to radially clamp a shaft while maintaining a basic clamping force. An auxiliary clamp is also incorporated within the chuck to further stabilize the clamping effect. As the three-jaw chuck rotates, the centrifugal force in the auxiliary clamp causes the centrifugal mass to move along a predetermined path, thereby driving the internal transmission assembly. The transmission assembly then guides the auxiliary bevel gear to rotate, tightening the small bevel gear. This, in turn, locks the large bevel gear through the small bevel gear, creating a linked locking effect across the entire structure. This process effectively mitigates the potential for reduced clamping force due to centrifugal force, enhancing clamping stability and operational reliability, and meeting the higher demands for maintaining clamping force under high-speed rotation. The entire system boasts a compact structure and a clear transmission path. This system effectively converts the centrifugal force caused by rotation into a driving force that increases the clamping force, achieving a dynamic coupling between the clamping and self-locking functions. This improves machining accuracy and operational safety, while also resolving the problem of existing three-jaw chucks that can easily cause shaft loosening during low-speed or variable-speed machining. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The present invention is a stereoscopic diagram of a CNC lathe shaft workpiece processing fixture.

[0020] Figure 2 The present invention is a three-dimensional cross-sectional view of a CNC lathe shaft workpiece processing fixture.

[0021] Figure 3 The present invention is a cross-sectional view of a CNC lathe shaft workpiece processing fixture.

[0022] Figure 4 yes Figure 3 A partial enlarged view of point A.

[0023] Figure 5 The present invention is a schematic diagram of a centrifugal block installed in a chuck body in a CNC lathe shaft workpiece processing fixture.

[0024] Figure 6It is a stereoscopic diagram of the internal structure of a CNC lathe shaft workpiece processing fixture of the present invention under a first viewing angle.

[0025] Figure 7 yes Figure 6 A partial enlarged view of point B.

[0026] Figure 8 yes Figure 6 A partial enlarged view of point C.

[0027] Figure 9 yes Figure 6 A partial enlarged view of point D.

[0028] Figure 10 It is a stereoscopic diagram of the internal structure of a CNC lathe shaft workpiece processing fixture under a second viewing angle of the present invention.

[0029] The numbers in the figure are: 11, chuck body; 111, positioning port; 112, mounting groove; 12, large bevel gear; 13, small bevel gear; 14, claw; 21, auxiliary bevel gear; 22, centrifugal block; 23, transmission assembly; 231, trigger ring; 2311, passive ring; 2312, conical groove; 2313, driving cylinder; 2314, connecting hole; 232, executive ring; 2321, arc groove; 2322, connecting cylinder; 2323, connecting ring; 233, guide pin; 234, elastic reset element; 235, spring; 24, inner ball; 25, outer ball. DETAILED DESCRIPTION

[0030] In order to further understand the features, technical means, specific objectives and functions achieved by the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] like Figure 1 、 Figure 2 and Figure 3As shown, a CNC lathe shaft workpiece processing fixture includes a three-jaw chuck, the three-jaw chuck includes a chuck body 11, a large bevel gear 12, a small bevel gear 13 and a clamping jaw 14, and also includes an auxiliary clamp, the auxiliary clamp includes: an auxiliary bevel gear 21, which is rotatably arranged in the chuck body 11 and coaxially arranged with the large bevel gear 12 and meshed with at least one of the small bevel gears 13; a centrifugal block 22, which is slidably arranged in the chuck body 11 along the radial direction of the chuck body 11, and the centrifugal block 22 can move with the chuck body The rotation of 11 generates centrifugal displacement; a transmission assembly 23 is arranged in the chuck body 11 and connects the centrifugal block 22 and the auxiliary bevel gear 21, and is used to convert the radial displacement of the centrifugal block 22 into the rotational motion of the auxiliary bevel gear 21; when the rotation speed of the chuck body 11 exceeds the set threshold, the centrifugal block 22 slides in a direction away from the axis of the chuck body 11, and guides the auxiliary bevel gear 21 through the transmission assembly 23 to generate a rotational trend tending to tighten the small bevel gear 13, and then the large bevel gear 12 is locked by the small bevel gear 13.

[0032] A three-jaw chuck clamps a shaft by simultaneously moving three equally spaced jaws 14 radially toward the center. A built-in large bevel gear 12 synchronizes the three jaws, ensuring their movement. When a chuck wrench or a CNC system drives the chuck body 11 to rotate the spiral disk on the large bevel gear 12, the jaws 14 move radially within their guide rails, firmly clamping the shaft in the center.

[0033] The auxiliary clamp forms a dynamic self-locking mechanism within the three-jaw chuck. Within the chuck body 11, an auxiliary bevel gear 21 is rotatably mounted, its axis coaxial with the large bevel gear 12, creating a structurally stable transmission foundation. The auxiliary bevel gear 21 meshes with at least one small bevel gear 13, ensuring effective driving force is applied to the small bevel gear 13 during its rotation. The small bevel gear 13, in turn, forms a locking linkage with the large bevel gear 12 through its meshing relationship, indirectly contributing to the three-jaw chuck's clamping stability.

[0034] The centrifugal weight 22 is slidably mounted within the chuck body 11 and is freely movable radially. As the chuck rotates, it is affected by centrifugal force, causing it to displace radially outward. This centrifugal displacement not only directly responds to changes in the chuck's rotational speed but also serves as the driving force for the subsequent auxiliary clamping action. A transmission assembly 23 is also located within the chuck body 11 to convert the radial displacement of the centrifugal weight 22 into rotational motion for the auxiliary bevel gear 21.

[0035] When the chuck body 11 reaches or exceeds a set speed threshold, the centrifugal force acting on the centrifugal weight 22 causes it to slide rapidly away from the axis of the chuck body 11. This sliding behavior is converted by the transmission assembly 23 into a rotational trend of the auxiliary bevel gear 21, which then meshes with the small bevel gear 13, driving the small bevel gear 13 to rotate. As the small bevel gear 13 continues to rotate, it forms a locking relationship with the large bevel gear 12, placing the entire clamping system in a state of passively increasing clamping force. The secondary clamping force, automatically applied as the speed increases, effectively prevents the primary clamping force from decreasing due to centrifugal force.

[0036] like Figure 3 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 and Figure 10 As shown, the transmission assembly 23 includes a trigger ring 231, which is slidably arranged in the chuck body 11 along the axial direction of the chuck body 11, and the trigger ring 231 has an inclined surface that forms contact with the centrifugal block 22. When the centrifugal block 22 is away from the axis of the chuck body 11, the trigger ring 231 moves along its axial direction; an execution ring 232, which is coaxially connected to the auxiliary bevel gear 21, and an arc groove 2321 is provided on the inner circumferential surface of the execution ring 232; a guide pin 233, which is arranged on the trigger ring 231 along the radial direction of the trigger ring 231, and one end of the guide pin 233 extends into the arc groove 2321 and slides with it.

[0037] Trigger ring 231 is positioned axially along the chuck body 11 and is capable of axial sliding movement within the chuck. Its surface features an inclined surface that contacts centrifugal weight 22. When the chuck rotates at high speed, the centrifugal weight 22 slides radially outward due to the increased centrifugal force. Its outer edge then contacts the inclined surface of trigger ring 231, generating a thrust along the chuck axis, causing the entire trigger ring 231 to move axially.

[0038] The actuator ring 232 is coaxially arranged with the auxiliary bevel gear 21 and rigidly connected, so that the rotation of the actuator ring 232 directly drives the rotation of the auxiliary bevel gear 21. Its inner circumference is machined with a number of arcuate grooves 2321, which cooperate with the guide pins 233 to convert the axial movement of the trigger ring 231 into the rotational movement of the actuator ring 232.

[0039] Guide pin 233 is radially fixed to trigger ring 231, with one end extending into and slidingly engaging arcuate groove 2321 on the inner circumference of actuator ring 232. As trigger ring 231 moves axially, guide pin 233 slides along arcuate groove 2321. Due to the arcuate shape of the groove, this sliding movement not only drives guide pin 233 radially but also forces actuator ring 232 to rotate.

[0040] The entire transmission process starts with the radial sliding of the centrifugal block 22, which drives the trigger ring 231 to slide axially through the inclined contact, and then the interaction between the guide pin 233 and the arc groove 2321 finally causes the actuator ring 232 to rotate, thereby driving the auxiliary bevel gear 21 to rotate, thereby realizing the tightening trend of the small bevel gear 13 and completing the locking of the large bevel gear 12.

[0041] like Figure 4 As shown, a positioning opening 111 is provided in the chuck body 11, and the execution ring 232 has: a connecting cylinder 2322, which is coaxially rotatably arranged in the positioning opening 111, and the arc groove 2321 is circumferentially distributed on the inner circumferential surface of the connecting cylinder 2322; a connecting ring 2323, which is coaxially connected to the connecting cylinder 2322 and the auxiliary bevel gear 21.

[0042] The connecting tube 2322 is coaxially embedded in the positioning opening 111 of the chuck body 11 in a rotatable manner, which not only plays a physical constraint role on the rotation axis, but also effectively avoids vibration or engagement error caused by component offset under high-speed rotation.

[0043] The inner circumference of the connecting cylinder 2322 is provided with a plurality of arcuate grooves 2321. These arcuate grooves 2321 are arranged circumferentially, forming a curved path that matches the guide pin 233. This circumferential arrangement fully utilizes the axial sliding behavior of the guide pin 233 driven by the trigger ring 231, ensuring a natural and efficient sliding path within the arcuate grooves 2321, ultimately achieving stable rotation of the connecting cylinder 2322 and, ultimately, the entire actuator ring 232.

[0044] The connecting ring 2323 is structurally connected to the connecting cylinder 2322 in an integrated coaxial manner, and also maintains a coaxial linkage relationship with the auxiliary bevel gear 21. The rotational motion of the connecting cylinder 2322 can be directly transmitted to the auxiliary bevel gear 21.

[0045] like Figure 4 and Figure 6As shown, the chuck body 11 is further provided with an installation cavity close to the positioning port 111, and the trigger ring 231 has: a passive ring 2311, which is rotatably arranged in the installation cavity, and the inner periphery of the passive ring 2311 forms an inclined surface that cooperates with the centrifugal block 22; a driving cylinder 2313, which is coaxially arranged at one end of the passive ring 2311 facing the positioning port 111, and the guide pin 233 is arranged on the driving cylinder 2313.

[0046] The internal structure of the chuck body 11 is provided with an installation cavity, which is arranged adjacent to the positioning opening 111 and is used to accommodate and support the key trigger ring 231 in the transmission system, so that the entire centrifugal linkage mechanism has a more stable installation foundation and precise motion guidance.

[0047] In this structure, the trigger ring 231 is composed of a passive ring 2311 and a drive cylinder 2313. The passive ring 2311 is rotatably mounted in the mounting cavity of the chuck body 11. Its inner circumference is machined with a bevel structure for contacting and fitting with the centrifugal block 22. When the chuck rotates at high speed, the centrifugal block 22 moves radially outward due to the centrifugal force, and its edge contacts the inner bevel of the passive ring 2311, pushing the passive ring 2311 to rotate around its axis or guiding it to produce a slight axial displacement. The contact between the bevel and the centrifugal block 22 not only establishes the initial response path of the transmission system, but also provides a continuous power source for subsequent driving actions.

[0048] A driving cylinder 2313 is provided at the front end of the passive ring 2311, and the two are coaxially connected, and together constitute the transmission unit of the trigger ring 231. The driving cylinder 2313 is located on the side close to the positioning port 111 and is connected to the execution ring 232. The guide pin 233 is radially arranged on the driving cylinder 2313, and one end thereof is inserted into the arc groove 2321 of the execution ring 232, forming a sliding fit relationship therewith. As the passive ring 2311 rotates or moves under the action of the centrifugal block 22, the driving cylinder 2313 moves synchronously, thereby driving the guide pin 233 to slide along a predetermined trajectory in the arc groove 2321. Since the arc groove 2321 is designed in a specific arc, the sliding process of the guide pin 233 converts the axial motion into the rotation of the execution ring 232, thereby driving the auxiliary bevel gear 21 to complete the torque output in the clamping direction.

[0049] like Figure 4 and Figure 6 As shown, an elastic reset element 234 is provided between the passive ring 2311 and the positioning opening 111 .

[0050] During high-speed rotation of the chuck, centrifugal force drives centrifugal weight 22 radially outward, and through its contact with the inner inclined surface of passive ring 2311, it pushes passive ring 2311 to achieve axial displacement. However, in order for passive ring 2311 to achieve this displacement, the elastic force applied by elastic reset element 234 must first be overcome. This creates a controlled response mechanism: axial movement is triggered only when the centrifugal force reaches a sufficient level to overcome this elastic force. This design effectively avoids malfunctions caused by brief disturbances or speed changes, ensuring that the system has good selectivity and a high response threshold before achieving clamping action.

[0051] As the passive ring 2311 undergoes axial displacement, it drives the drive cylinder 2313 to move integrally with it, pushing the guide pin 233 mounted on the drive cylinder 2313 to slide along the arcuate groove 2321 on the actuator ring 232. This causes the actuator ring 232 to undergo angular displacement, which in turn drives the auxiliary bevel gear 21 to rotate, creating a transmission trend for the pinion bevel gear 13, completing the clamping process of the shaft. At this point, the system is in a stable clamping state, with all components operating in coordination under external force drive and structural guidance, ensuring that the shaft is firmly and reliably fixed in the three-jaw chuck.

[0052] When the three-jaw chuck stops rotating, the centrifugal force disappears quickly, and the centrifugal block 22 retracts inward without external support, and no longer applies axial thrust to the passive ring 2311. At this time, the elastic reset element 234 that was previously compressed or stretched begins to release its stored elastic potential energy, acting in the opposite direction on the passive ring 2311, pushing it back to its initial position. As the passive ring 2311 resets, the drive cylinder 2313 also retreats, and the guide pin 233 slides in the opposite direction in the arc groove 2321, causing the execution ring 232 to rotate in the opposite direction. In this process, the auxiliary bevel gear 21 rotates accordingly, thereby releasing the transmission tendency to the small bevel gear 13, and the shaft that was originally in a tightly clamped state is loosened. The operator can now easily separate the small bevel gear 13 from the three-jaw chuck by rotating it, thereby achieving fast and safe workpiece replacement.

[0053] like Figure 4 、 Figure 6 As shown, the driving cylinder 2313 is provided with connecting holes 2314 distributed along its circumference, the guide pin 233 is coaxially slidingly arranged in the connecting hole 2314, a spring 235 is provided between the guide pin 233 and the inner wall of the installation cavity, and the guide pin 233 abuts against the arc groove 2321.

[0054] By providing connecting holes 2314 distributed along the circumference of the drive cylinder 2313, each guide pin 233 can be installed within it, achieving uniform drive and stable linkage of the actuator ring 232. As a force transmission component, the guide pin 233 is designed to be coaxially slidably disposed within the connecting hole 2314. This not only ensures the radial guidance of the guide pin 233, but also provides good linear transmission during movement, facilitating precise rotation and position control of the actuator ring 232. Simultaneously, a spring 235 is provided between the guide pin 233 and the inner wall of the mounting cavity, imparting a certain elastic preload to the guide pin 233. The spring 235 absorbs instantaneous impacts generated during clamping or releasing, and when not subjected to external forces, it stably abuts the guide pin 233 against the arcuate groove 2321, preventing it from loosening or moving, thereby extending the structural stability and service life of the system.

[0055] like Figure 4 and Figure 6 As shown, the passive ring 2311 has a conical groove 2312 coaxial with the passive ring 2311 , and the centrifugal block 22 is in sliding fit with the conical groove 2312 .

[0056] The passive ring 2311 has a conical groove 2312 coaxially arranged therewith. The conical groove 2312 can not only guide the radial movement of the centrifugal block 22, but also form an effective component force in the axial direction, thereby pushing the passive ring 2311 to form axial displacement.

[0057] When the three-jaw chuck rotates at high speed, centrifugal force causes the centrifugal weight 22 to move from the inside outward, with its outer contour contacting the inner wall of the tapered groove 2312 and sliding along the tapered surface. This sliding fit converts the radial motion of the centrifugal weight 22 into an axial thrust acting on the passive ring 2311, forming the initial driving force for the clamping action.

[0058] The sliding between the centrifugal block 22 and the tapered groove 2312 not only brings about the continuity and adaptability of the structural response, but also enables the generation of the clamping force to be tightly coupled with the rotation speed.

[0059] The sliding fit also allows the centrifugal weight 22 to fall back quickly when the chuck stops rotating. When rotation stops and the centrifugal force is released, the centrifugal weight 22 slides back to its original position in the conical groove 2312 under its own weight or along the elastic member, ready for the subsequent clamping cycle.

[0060] like Figure 4 As shown, the contact surface between the centrifugal block 22 and the tapered groove 2312 is provided with an inner ball 24 , and the centrifugal block 22 and the tapered groove 2312 are in rolling engagement.

[0061] By placing inner balls 24 between the contact surface of centrifugal weight 22 and tapered groove 2312, the original sliding fit is optimized to a rolling fit. Compared to a sliding fit, a rolling fit has a lower coefficient of friction, effectively reducing energy loss, minimizing wear on the mating surfaces, and extending the service life of key components. It is particularly suitable for complex operating conditions such as frequent starts and stops and high speed operation.

[0062] The inner ball 24 is usually embedded in the contact surface of the centrifugal block 22. When the three-jaw chuck starts to rotate and gradually accelerates, the centrifugal block 22 moves from the inside to the outside under the action of centrifugal force, and its outer contour forms line contact or point contact with the inner wall of the tapered groove 2312 through the inner ball 24, thereby achieving low-resistance rolling motion.

[0063] like Figure 4 As shown, an outer ball 25 is provided between the outer circumferential surface of the passive ring 2311 and the inner wall of the installation cavity, and the passive ring 2311 and the installation cavity are in rolling cooperation.

[0064] External balls 25 are positioned between the outer circumference of the passive ring 2311 and the inner wall of the mounting cavity, creating a rolling fit between the passive ring 2311 and the mounting cavity. This structural design significantly reduces frictional resistance during axial movement of the passive ring 2311, enabling it to respond more smoothly and quickly to thrust from a centrifugal mechanism or other drive structure.

[0065] When the small bevel gear 13 rotates, it can drive the auxiliary bevel gear 21 to rotate, and the auxiliary bevel gear 21 can drive the trigger ring 231 and the execution ring 232 to rotate in the chuck body 11, thereby avoiding affecting the rotation of the small bevel gear 13.

[0066] like Figure 4 and Figure 10 As shown, the chuck body 11 is provided with mounting grooves 112 distributed along its circumference, and the mounting grooves 112 extend along the radial direction of the chuck body 11 .

[0067] The chuck body 11 is provided with mounting grooves 112 evenly distributed along its circumference, each extending radially. This structural design not only enhances the structural symmetry and load balance of the chuck body 11 but also provides a clear installation reference and movement guide for the arrangement of internal functional components. The centrifugal weights 22 are positioned in the mounting grooves 112, providing a clear guide path when subjected to radial forces or movement, preventing deflection or jamming.

[0068] The above embodiments merely represent one or more embodiments of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of protection of the present invention. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present invention, and such modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the appended claims.

Claims

1. A CNC lathe shaft workpiece processing fixture, comprising a three-jaw chuck, the three-jaw chuck comprising a chuck body, a large bevel gear, a small bevel gear and jaws, characterized in that: Also included is an auxiliary clamp, the auxiliary clamp comprising: an auxiliary bevel gear rotatably disposed in the chuck body, coaxially arranged with the large bevel gear, and meshing with at least one of the small bevel gears; a centrifugal block, which is slidably disposed in the chuck body along a radial direction of the chuck body, and can generate centrifugal displacement as the chuck body rotates; a transmission assembly, disposed in the chuck body and connecting the centrifugal block and the auxiliary bevel gear, for converting the radial displacement of the centrifugal block into the rotational motion of the auxiliary bevel gear; When the rotation speed of the chuck body exceeds a set threshold, the centrifugal block slides in a direction away from the axis of the chuck body, guiding the auxiliary bevel gear through the transmission assembly to generate a rotational tendency tending to tighten the small bevel gear, thereby exerting a locking effect on the large bevel gear through the small bevel gear; The transmission assembly includes: a trigger ring, slidably disposed in the chuck body along the axial direction of the chuck body, the trigger ring having an inclined surface in contact with the centrifugal block, and moving along the axial direction of the centrifugal block when the centrifugal block moves away from the axis of the chuck body; An actuator ring is coaxially connected to the auxiliary bevel gear, and an arc groove is provided on the inner circumference of the actuator ring; A guide pin is provided on the trigger ring along a radial direction of the trigger ring, one end of the guide pin extends into the arc-shaped groove and slides in engagement with the arc-shaped groove; The chuck body is provided with a positioning port, and the execution ring has: A connecting cylinder is coaxially rotatably disposed in the positioning opening, and the arc-shaped grooves are circumferentially distributed on the inner circumferential surface of the connecting cylinder; A connecting ring is coaxially connected to the connecting cylinder and the auxiliary bevel gear; the chuck body is further provided with a mounting cavity close to the positioning port, and the trigger ring has: A passive ring is rotatably disposed in the mounting cavity, wherein the inner circumference of the passive ring forms an inclined surface that cooperates with the centrifugal block; The driving cylinder is coaxially arranged at one end of the passive ring facing the positioning port, and the guide pin is arranged on the driving cylinder; an elastic reset element is arranged between the passive ring and the positioning port.

2. A CNC lathe shaft workpiece processing fixture according to claim 1, characterized in that: The driving cylinder is provided with connecting holes distributed along its circumference, the guide pin is coaxially slidably arranged in the connecting hole, a spring is provided between the guide pin and the inner wall of the installation cavity, and the guide pin abuts against the arc groove.

3. A CNC lathe shaft workpiece processing fixture according to claim 1 or 2, characterized in that: The passive ring has a conical groove coaxial with the passive ring, and the centrifugal block is in sliding fit with the conical groove.

4. A CNC lathe shaft workpiece processing fixture according to claim 3, characterized in that: The contact surface between the centrifugal block and the tapered groove is provided with an inner ball, and the centrifugal block and the tapered groove are in rolling cooperation.

5. The CNC lathe shaft workpiece processing fixture according to claim 3, characterized in that: An outer ball is provided between the outer circumferential surface of the passive ring and the inner wall of the installation cavity, and the passive ring and the installation cavity are in rolling cooperation.

6. A CNC lathe shaft workpiece processing fixture according to claim 1 or 2, characterized in that: The chuck body is provided with mounting grooves distributed along its circumference, and the mounting grooves extend along the radial direction of the chuck body.

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