Workpiece rapid positioning fixture and numerical control machine tool

Abstract

The application discloses a workpiece rapid positioning clamp and a numerical control machine tool, wherein the workpiece rapid positioning clamp comprises a fixing base, a mounting base and a clamping assembly. The clamping assembly comprises a first clamping mechanism and a second clamping mechanism. The first clamping mechanism is used for abutting against an inner side surface of a workpiece in a first direction. The second clamping mechanism is used for abutting against an outer side surface of the workpiece in the first direction and an inner side surface of the workpiece in a second direction. The first clamping mechanism is connected with the second clamping mechanism. The first clamping mechanism is driven to make the first clamping mechanism and the second clamping mechanism abut against the outer surface of the workpiece simultaneously. The first clamping mechanism is driven to abut against the inner side surface in the first direction of the workpiece, and the second clamping mechanism is driven to abut against the outer side surface and the inner side surface of the workpiece simultaneously. The workpiece is positioned on the mounting base while being clamped, so that the workpiece is clamped and positioned rapidly.

Description

Technical Field

[0001] This invention relates to the technical field of metal machining, and particularly to a workpiece rapid positioning fixture and a CNC machine tool. Background Technology

[0002] Three-axis and four-axis CNC machining tools are generally used to process workpieces with various structural features such as spatial polyhedrons, hollow structures, and thin walls. However, in traditional three-axis and four-axis machining, machining complex parts often requires multiple clamping operations to complete all machining surfaces. This not only increases machining time but also reduces machining accuracy and efficiency. Therefore, there is an urgent need for a positioning fixture that can quickly clamp workpieces to meet production requirements. Summary of the Invention

[0003] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a workpiece quick-positioning fixture, which can quickly clamp special workpieces, shorten the overall processing time, and improve production efficiency.

[0004] The present invention also proposes a CNC machine tool having the above-mentioned workpiece rapid positioning fixture.

[0005] According to a first aspect of the present invention, a workpiece rapid positioning fixture includes:

[0006] A fixed base having a rotation center is fixed to a machine tool;

[0007] A mounting base, which is mounted on the fixed base, wherein the mounting surface of the mounting base has a first direction and a second direction that are perpendicular to each other; and

[0008] A clamping assembly is disposed in the mounting base, the clamping assembly having two clamping stations, the two clamping stations being disposed opposite each other along a first direction of the mounting base, the clamping assembly being used to clamp and position a workpiece at the clamping stations;

[0009] The clamping assembly includes:

[0010] A first clamping mechanism is disposed at the center of the mounting base, and the center of the first clamping mechanism coincides with the rotation center of the fixed base. The first clamping mechanism is used to abut against the inner surface of the workpiece in the first direction; and

[0011] The second clamping mechanism is disposed on the mounting base and is located on opposite sides of the first clamping mechanism. The second clamping mechanism is used to abut against the outer surface of the workpiece in the first direction and the inner surface in the second direction. The first clamping mechanism is connected to the second clamping mechanism and drives the first clamping mechanism so that the first clamping mechanism and the second clamping mechanism abut against the outer surface of the workpiece simultaneously.

[0012] The workpiece quick positioning fixture according to embodiments of the present invention has at least the following beneficial effects: when the first clamping mechanism is connected to the second clamping mechanism, by driving the first clamping mechanism to abut against the inner surface of the workpiece in the first direction, the second clamping mechanism can also be driven to abut against the outer surface of the workpiece in the first direction and the inner surface of the workpiece in the second direction. While the first clamping mechanism and the second clamping mechanism clamp the workpiece simultaneously, the workpiece is also accurately positioned on the mounting base, thereby achieving the purpose of quick workpiece clamping, shortening the clamping time, and thus improving production efficiency.

[0013] According to some embodiments of the present invention, the first clamping mechanism includes:

[0014] A first driving member is rotatably mounted on the mounting base, and the rotation center of the first driving member coincides with the rotation center of the fixed base.

[0015] The first clamping block, comprising two blocks, is slidably mounted on the mounting base. The two first clamping blocks extend along the second direction and are respectively disposed on both sides of the first driving member in the first direction. The two first clamping blocks are connected by a first elastic member. The outer surface of the first driving member abuts against the inner surface of the first clamping block, and the outer surface of the first clamping block abuts against the inner surface of the workpiece.

[0016] According to some embodiments of the present invention, the first driving element includes:

[0017] A first driving unit, the upper end of which is located on the mounting base; and

[0018] The first rotating part has its lower end connected to the first driving part. The first driving part is used to drive the first rotating part. The outer peripheral side of the first rotating part is cam-shaped, and the outer arc-shaped surface of the first rotating part abuts against the first clamping block.

[0019] According to some embodiments of the present invention, the first driving element further includes:

[0020] A second rotating part is movably disposed between the first rotating parts. Two second rotating parts are provided, and the two second rotating parts are rotationally symmetrical about the rotation center. The outer periphery of the second rotating part is cam-shaped. The two second rotating parts are connected by a second elastic element, and the two second rotating parts are slidably connected to the first rotating parts.

[0021] The second driving part is sleeved on the first driving part. A second driving member is provided on the lower outer periphery of the second driving part. The second driving member is located between the two second rotating parts. The outer periphery of the second driving member is cam-shaped. The outer side of the second driving member abuts against the inner surface of the second rotating part. The second driving part is used to drive the second driving member. The second driving member rotates to make the two second rotating parts slide outward relative to the first rotating part.

[0022] According to some embodiments of the present invention, the second clamping mechanism includes:

[0023] A third driving member is rotatably disposed below the mounting base. The third driving member is disposed at the lower end of the first driving member, and the first driving member can drive the third driving member to rotate.

[0024] The transmission components are provided in two parts, which are positioned below the mounting base. One end of each transmission component is connected to the third driving component, and the two transmission components are located on opposite sides of the third driving component.

[0025] The clamping block assembly is slidably disposed on the mounting base. There are two sets of clamping block assemblies, and the two sets of clamping block assemblies are respectively connected to the other ends of the two transmission components. The third driving component is used to drive the transmission components to move, so that the transmission components drive the clamping block assemblies to abut against the outer surface of the workpiece in the first direction and the inner surface in the second direction, respectively.

[0026] According to some embodiments of the present invention, the transmission component includes:

[0027] The first link, one end of which is connected to the third drive member;

[0028] A second link, slidably disposed at the lower end of the mounting base, one end of the second link being connected to the other end of the first link; and

[0029] The third link, comprising two links, one end of each link being connected to the other end of the second link, and the other ends of each link being connected to the clamping block assembly; and

[0030] The fourth link is slidably disposed in the mounting base. The clamping block assembly includes two second clamping blocks, which are respectively connected to the third link through the fourth link. One end of the fourth link is connected to the second clamping block.

[0031] According to some embodiments of the present invention, the third link has an oblong hole, the length direction of which extends along the length direction of the third link, and the fourth link is slidably disposed in the oblong hole.

[0032] According to some embodiments of the present invention, the two third links are hinged to the second link, and the fourth link is rotatably inserted through the other end of the third links.

[0033] According to some embodiments of the present invention, the second clamping mechanism further includes two adjusting members, which are disposed on the two transmission members and located between the two third links. The adjusting members are used to adjust the included angle between the two third links to adjust the initial distance between the two second clamping blocks.

[0034] According to a second aspect of the present invention, a CNC machine tool includes the workpiece rapid positioning fixture described in any of the embodiments of the first aspect.

[0035] The CNC machine tool according to embodiments of the present invention has at least the following beneficial effects: Since the CNC machine tool is connected to the second clamping mechanism via the first clamping mechanism, while driving the first clamping mechanism to abut against the inner surface of the workpiece in the first direction, the first clamping mechanism can also drive the second clamping mechanism to abut against the outer surface of the workpiece in the first direction and the inner surface in the second direction. The operator only needs to drive the first clamping mechanism to simultaneously drive both the first and second clamping mechanisms. While the first and second clamping mechanisms simultaneously clamp the workpiece, they also accurately position the workpiece on the mounting base, thereby achieving rapid workpiece clamping, shortening clamping time, and thus improving production efficiency.

[0036] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0037] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0038] Figure 1 This is a schematic diagram of a CNC machine tool according to a second aspect embodiment of the present invention;

[0039] Figure 2 for Figure 1 A schematic diagram of a workpiece quick positioning fixture according to a first aspect embodiment is shown;

[0040] Figure 3 for Figure 2 An exploded view of part of the workpiece rapid positioning fixture is shown.

[0041] Figure 4 for Figure 3 An exploded view of the first drive component of the first clamping mechanism is shown.

[0042] Figure 5 for Figure 3 A schematic diagram showing the cooperation of the first clamping mechanism and the second clamping mechanism;

[0043] Figure 6 for Figure 5 A schematic diagram of the first clamping mechanism and the second clamping mechanism from another perspective.

[0044] Figure label:

[0045] 1. CNC machine tool; 2. Workpiece quick positioning fixture; 4. Workpiece;

[0046] Fixture 10;

[0047] Mounting base 20; Clamping station 21;

[0048] Clamping assembly 30; first clamping mechanism 31; first driving member 311; first driving part 3111; first rotating part 3112; second rotating part 3113; second elastic member 3113a; second driving part 3114; second driving member 3114a; first clamping block 312; second clamping mechanism 32; third driving member 321; transmission member 322; first connecting rod 3221; second connecting rod 3222; third connecting rod 3223; oblong hole 3223a; fourth connecting rod 3224; clamping block group 323; second clamping block 3231. Detailed Implementation

[0049] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0050] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are 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 limiting this invention.

[0051] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0052] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0053] Reference Figures 1 to 3 According to a first aspect embodiment of the present invention, the workpiece quick positioning fixture 2 includes: a fixed base 10, a mounting base 20, and a clamping assembly 30. The fixed base 10 has a rotation center and is fixed to a machine tool; the mounting base 20 is mounted on the fixed base 10, and the mounting surface of the mounting base 20 has a first direction (front-back direction as shown in the figure) and a second direction (left-right direction as shown in the figure) that are perpendicular to each other; the clamping assembly 30 is disposed in the mounting base 20, and the clamping assembly 30 has two clamping positions 21, the positions of the two clamping positions 21 being arranged opposite to each other along the first direction of the mounting surface of the mounting base 20, and the two clamping assemblies 30 are respectively used to clamp and position the workpiece 4 on the clamping positions 21.

[0054] The clamping assembly 30 includes a first clamping mechanism 31 and a second clamping mechanism 32. The first clamping mechanism 31 is located at the center of the mounting base 20, and its center coincides with the rotation center of the fixed base 10. The first clamping mechanism 31 is used to abut against the inner surface of the workpiece 4 in a first direction. The second clamping mechanism 32 is located on the mounting base 20, and is located on opposite sides of the first clamping mechanism 31. The second clamping mechanism 32 is used to abut against the outer surface of the workpiece 4 in a first direction and the inner surface in a second direction. The first clamping mechanism 31 and the second clamping mechanism 32 are connected, and the first clamping mechanism 31 is driven so that the first clamping mechanism 31 and the second clamping mechanism 32 simultaneously abut against the outer surface of the workpiece 4.

[0055] The workpiece quick positioning fixture 2 provided by the present invention mainly includes three parts: a fixed base 10, a mounting base 20, and a clamping assembly 30. The fixed base 10 is fixed to the machine tool and has a rotation center; the mounting base 20 is mounted on the fixed base 10, and its mounting surface has a first direction and a second direction perpendicular to each other, and is equipped with two clamping stations 21 arranged opposite to each other along the first direction; the clamping assembly 30 is disposed in the mounting base 20 and is used to clamp and position the workpiece 4 on the clamping stations 21.

[0056] Specifically, the fixed base 10 is the foundation of the fixture. Precision machining ensures it has an accurate center of rotation and allows it to be securely mounted on the machine tool. The design of the fixed base 10 must consider compatibility with the machine tool to ensure stable operation of the fixture. The mounting base 20 is mounted on the fixed base 10. Its mounting surface is designed with precise first and second directions, which are perpendicular to each other, providing an accurate reference for positioning the workpiece 4. The mounting base 20 has two clamping stations 21, which are arranged opposite each other along the first direction for placing and positioning the workpiece 4. The clamping assembly 30 is the core of the fixture, including a first clamping mechanism 31 and a second clamping mechanism 32. The first clamping mechanism 31 is located at the center of the mounting base 20, with its center coinciding with the center of rotation of the fixed base 10. The first clamping mechanism 31 is designed to abut against the inner surface of the workpiece 4 in the first direction, ensuring that the workpiece 4 maintains an accurate position during clamping through precise adjustment. The second clamping mechanism 32 is located on the mounting base 20, on either side of the first clamping mechanism 31. The second clamping mechanism 32 is used not only to abut against the outer surface of the workpiece 4 in the first direction, but also to abut against the inner surface of the workpiece 4 in the second direction. The first clamping mechanism 31 and the second clamping mechanism 32 are connected, so when the first clamping mechanism 31 is driven, the second clamping mechanism 32 can be driven to move at the same time, so that the workpiece 4 can be clamped in multiple directions at the same time.

[0057] In use, the workpiece 4 is first placed on the clamping station 21 of the mounting base 20. The position of the workpiece 4 is adjusted to match the contact surfaces of the first clamping mechanism 31 and the second clamping mechanism 32. Then, the drive mechanism of the clamping assembly 30 is activated, driving the first clamping mechanism 31 to move inward toward the workpiece 4, while simultaneously driving the second clamping mechanism 32 to move outward and inward toward the workpiece 4, until the workpiece 4 is fully clamped. Since the first clamping mechanism 31 coincides with the rotation center of the fixed base 10, the fixture can maintain the stability of the workpiece 4's position during rotational machining, thereby improving machining accuracy and efficiency.

[0058] It is understood that the workpiece rapid positioning fixture 2 of the present invention has the following significant advantages: Through the precise design of the clamping station 21 and clamping assembly 30, rapid positioning and clamping of the workpiece 4 is achieved, greatly shortening the processing preparation time. The fixture design takes into account the rotation center of the machine tool and the positioning accuracy of the workpiece 4, ensuring high precision during the processing. The clamping station 21 and clamping assembly 30 of the fixture can be adjusted according to the shape and size of different workpieces 4, improving the versatility and flexibility of the fixture.

[0059] It is also understood that the workpiece quick positioning fixture 2 according to the embodiment of the present invention has at least the following beneficial effects: the first clamping mechanism 31 is connected to the second clamping mechanism 32. By driving the first clamping mechanism 31 so that the first clamping mechanism 31 abuts against the inner surface of the workpiece 4 in the first direction, the second clamping mechanism 32 can also be driven so that the second clamping mechanism 32 abuts against the outer surface of the workpiece 4 in the first direction and the inner surface in the second direction. While the first clamping mechanism 31 and the second clamping mechanism 32 clamp the workpiece 4 at the same time, the workpiece 4 is also accurately positioned on the mounting base 20, thereby achieving the purpose of quickly clamping the workpiece 4, shortening the clamping time, and thus improving production efficiency.

[0060] Reference Figures 2 to 4 In some embodiments of the present invention, the first clamping mechanism 31 includes a first driving member 311 and a first clamping block 312. The first driving member 311 is rotatably mounted on the mounting base 20, and the rotation center of the first driving member 311 coincides with the rotation center of the fixed base 10. Two first clamping blocks 312 are provided, and the two first clamping blocks 312 are slidably mounted on the mounting base 20. The two first clamping blocks 312 extend along a second direction and are respectively disposed on both sides of the first driving member 311 in a first direction. The two first clamping blocks 312 are connected by a first elastic member. The outer surface of the first driving member 311 abuts against the inner surface of the first clamping block 312, and the outer surface of the first clamping block 312 abuts against the inner surface of the workpiece 4.

[0061] According to the workpiece quick positioning fixture 2 of the above embodiment, the present invention further provides a specific structure of the first clamping mechanism 31, which includes a first driving member 311 and a first clamping block 312, which are described in detail below.

[0062] The first driving component 311 is the core component that drives the movement of the first clamping block 312. It is rotatably mounted on the mounting base 20, and its center of rotation coincides with the center of rotation of the fixed base 10. This design ensures that the first driving component 311 maintains overall coordination with the fixture and machine tool when driving the first clamping block 312, avoiding the generation of additional torque or offset, thereby ensuring the accuracy and stability of the workpiece 4 positioning. The first driving component 311 can take various forms, such as a motor-driven wheel, a hydraulically or pneumatically driven rotary cylinder, etc., and the specific selection depends on the actual application scenario and the requirements for fixture performance. The first clamping block 312 is the component that directly contacts the workpiece 4 and applies clamping force. In this invention, two first clamping blocks 312 are provided, which are slidably mounted on the mounting base 20 and extend along the second direction. Two first clamping blocks 312 are respectively disposed on both sides of the first driving member 311 in the first direction. This arrangement allows the first driving member 311 to uniformly push the two first clamping blocks 312 toward the inside of the workpiece 4 when rotating, thereby clamping the workpiece 4.

[0063] To improve clamping flexibility and adaptability, the two first clamping blocks 312 are connected by a first elastic element (not shown in the figure, such as a spring). Thus, when the first driving member 311 rotates and pushes the first clamping block 312 to clamp the workpiece 4, once the driving force disappears or decreases, the first elastic element will use its elastic restoring force to pull the first clamping block 312 back to its initial position, preparing for the next clamping operation. The outer surface of the first clamping block 312 is designed with a contact surface that matches the inner surface of the workpiece 4 to ensure that the clamping force is transmitted evenly during the clamping process, preventing deformation or displacement of the workpiece 4 due to uneven force distribution.

[0064] When workpiece 4 needs to be clamped, the first drive member 311 is activated to rotate. Since the rotation center of the first drive member 311 coincides with the rotation center of the fixed base 10, its rotation can be smoothly transmitted to the first clamping block 312. The outer surface of the first drive member 311 abuts against the inner surface of the first clamping block 312, pushing the first clamping block 312 to slide along the mounting base 20 and move inward toward the workpiece 4. At the same time, since the two first clamping blocks 312 are connected by the first elastic element, the first elastic element is compressed and stores elastic potential energy. When processing is completed or workpiece 4 needs to be released, the first drive member 311 stops rotating or reverses. Due to the reset effect of the first elastic element, the two first clamping blocks 312 will automatically move in opposite directions, releasing the clamping force on workpiece 4, allowing workpiece 4 to be easily removed. Through the cooperation of the two first clamping blocks 312 and the first elastic element, uniform clamping of the inner surface of workpiece 4 is achieved, avoiding deformation or displacement caused by uneven force. The rotation center of the first driving component 311 coincides with the rotation center of the fixed base 10, ensuring stability and reliability during the clamping process. The design of the first clamping block 312 and the first elastic element allows the fixture to adapt to workpieces 4 of different shapes and sizes, improving the versatility and flexibility of the fixture.

[0065] Furthermore, referring to Figures 3 to 6 In some embodiments of the present invention, the first driving member 311 includes a first driving part 3111 and a first rotating part 3112. The upper end of the first driving part 3111 is located on the mounting base 20; the lower end of the first driving part 3111 is connected to the first rotating part 3112. The first driving part 3111 is used to drive the first rotating part 3112. The outer peripheral side of the first rotating part 3112 is cam-shaped, and the outer arc-shaped surface of the first rotating part 3112 abuts against the first clamping block 312.

[0066] Specifically, the first driving member 311, as a key component for driving the movement of the first clamping block 312, consists of two parts: a first driving part 3111 and a first rotating part 3112. The upper end of the first driving part 3111 is fixed to the mounting base 20, and a suitable connection method ensures a stable connection between it and the mounting base 20. The lower end of the first driving part 3111 is connected to the first rotating part 3112, responsible for driving the first rotating part 3112 to rotate. The first driving part 3111 is the part that provides driving force, and it can adopt various driving methods according to actual needs, such as motor drive, hydraulic drive, or pneumatic drive. In this invention, the specific form of the first driving part 3111 is not strictly limited, as long as it can stably and reliably drive the first rotating part 3112 to rotate. The first rotating part 3112 is the part of the first driving member 311 that directly acts on the first clamping block 312, and its outer periphery is designed in a cam shape. This design allows the outer arc-shaped surface of the first rotating part 3112 to evenly abut against the inner surface of the first clamping block 312 when rotating, thereby pushing the first clamping block 312 to slide along the mounting base 20 and clamping the workpiece 4. The cam-shaped design not only ensures a large and uniform contact area between the first rotating part 3112 and the first clamping block 312, but also enables the generation of continuous and stable clamping force during the driving process, avoiding damage to the workpiece 4 or the fixture itself due to insufficient contact points or uneven clamping force.

[0067] When workpiece 4 needs to be clamped, the first drive unit 3111 is activated and provides driving force, driving the first rotating unit 3112 to start rotating. Since the outer periphery of the first rotating unit 3112 is cam-shaped, as it rotates, the outer arc-shaped surface gradually abuts against the inner surface of the first clamping block 312, pushing the first clamping block 312 to slide inwards towards the workpiece 4. Simultaneously, since the two first clamping blocks 312 are connected by a first elastic element, once the first drive unit 311 rotates and pushes the first clamping block 312 to clamp workpiece 4, if the driving force disappears or decreases, the first elastic element will use its elastic restoring force to pull the first clamping block 312 back to its initial position, preparing for the next clamping operation. When processing is complete or workpiece 4 needs to be released, the first drive unit 3111 stops providing driving force or reverses the driving force, and the first rotating unit 3112 stops rotating or reverses its rotation. At this time, due to the resetting effect of the first elastic element, the two first clamping blocks 312 will automatically move in opposite directions, releasing the clamping force on the workpiece 4, so that the workpiece 4 can be easily removed.

[0068] It should be noted that the outer periphery of the first rotating part 3112 is designed in the shape of a cam. This shape was not chosen arbitrarily, but is based on profound mechanical principles and practical application requirements. The characteristic of the cam shape is that its surface contour can change according to a predetermined pattern, thereby generating a continuous and stable driving force during rotation. This design allows the first rotating part 3112 to evenly abut against the first clamping block 312 when rotating, ensuring a uniform distribution of clamping force and preventing the workpiece 4 from deforming or being damaged due to uneven force.

[0069] It is understandable that the Archimedean spiral is a special curve with the polar equation r = a + bθ, where r is the polar radius, θ is the polar angle, and a and b are constants. A key characteristic of the Archimedean spiral is its self-locking effect when force is applied along its direction; that is, without external force, the object remains in its current position and will not slip or fall off. Therefore, combining the cam shape with the self-locking principle of the Archimedean spiral is a major innovation of this invention. During rotation, the outer arcuate surface of the cam shape of the first rotating part 3112 moves along a path similar to the Archimedean spiral at its contact point with the first clamping block 312. This design ensures that when clamping the workpiece 4, even without an additional external locking mechanism, the first clamping block 312 can be stably held in the clamped position due to the self-locking characteristic of the cam shape, preventing easy loosening due to vibration or external force.

[0070] Specifically, when the first rotating part 3112 rotates to a certain position, the contact force formed between the outer arc surface of the cam shape and the first clamping block 312 generates a component along the helical direction. This component balances with other forces acting on the first clamping block 312 (such as the reaction force of the workpiece 4, the restoring force of the first elastic element, etc.), thereby achieving a self-locking effect. This self-locking mechanism not only improves the stability and reliability of the fixture, but also reduces the use of external locking mechanisms, simplifies the structure of the fixture, and reduces manufacturing costs.

[0071] Furthermore, referring to Figures 3 to 6In some embodiments of the present invention, the first driving member 311 further includes: a second rotating part 3113 and a second driving part 3114. The second rotating part 3113 is movably disposed between the first rotating part 3112. Two second rotating parts 3113 are provided, and the two second rotating parts 3113 are rotationally symmetrical about a rotation center. The outer periphery of the second rotating part 3113 is cam-shaped. The two second rotating parts 3113 are connected by a second elastic member 3113a, and the two second rotating parts 3113 are slidably connected to the first rotating part 3112. The second driving part 3114 is sleeved on the first driving part 3111. A second driving member 3114a is provided on the lower outer periphery of part 3114. The second driving member 3114a is located between two second rotating parts 3113. The outer periphery of the second driving member 3114a is cam-shaped. The outer surface of the second driving member 3114a abuts against the inner surface of the second rotating part 3113. The second driving part 3114 is used to drive the second driving member 3114a. The second driving member 3114a rotates so that the two second rotating parts 3113 slide outward relative to the first rotating part 3112.

[0072] According to the workpiece quick positioning fixture 2 of the above embodiment, the present invention has made a more detailed design and optimization of the first driving member 311, especially by introducing the second rotating part 3113 and the second driving part 3114. The following is a detailed description of its structure and working principle.

[0073] In addition to the first driving part 3111 and the first rotating part 3112, the first driving member 311 also includes two second rotating parts 3113. These two second rotating parts 3113 are movably disposed between the first rotating part 3112 and are rotationally symmetrically distributed with the rotation center as the point of symmetry. The outer periphery of the second rotating parts 3113 is also designed in a cam shape. This design is not only aesthetically pleasing but, more importantly, ensures smooth contact and pushing with adjacent components during rotation. The two second rotating parts 3113 are connected by a second elastic element 3113a (such as a spring). This design allows the second rotating parts 3113 to have a certain buffering and restoring capacity when subjected to external forces. Simultaneously, the second rotating parts 3113 can also be slidably connected to the first rotating part 3112. This sliding connection ensures that the second rotating parts 3113 can perform independent and smooth sliding motion relative to the first rotating part 3112 when driven. The second drive unit 3114, as a key component driving the movement of the second rotating part 3113, is fitted onto the first drive unit 3111. A second drive member 3114a is provided on the lower outer periphery of the second drive unit 3114. This drive member is located between the two second rotating parts 3113, and its outer periphery is also cam-shaped. This design allows the outer surface of the second drive member 3114a to evenly abut against the inner surface of the second rotating part 3113 when rotating, thereby pushing the second rotating part 3113 to slide. The second drive unit 3114 provides driving force through an appropriate driving method (such as motor, hydraulic, or pneumatic) to drive the second drive member 3114a to rotate. As the second drive member 3114a rotates, the two second rotating parts 3113 are subjected to a uniform thrust, sliding outwards relative to the first rotating part 3112. This sliding motion not only increases the clamping range of the fixture but also allows the fixture to more flexibly adapt to workpieces 4 of different shapes and sizes.

[0074] When workpiece 4 needs to be clamped, the first drive unit 3111 is activated first, driving the first rotating part 3112 to rotate. The outer periphery of the rotating part 3112, cam-shaped, abuts against the first clamping block 312, achieving initial clamping. Then, the second drive unit 3114 is activated, driving the second drive member 3114a to rotate. As the second drive member 3114a rotates, its cam-shaped outer surface evenly abuts against the inner surfaces of the two second rotating parts 3113, pushing the second rotating parts 3113 to slide outwards relative to the first rotating part 3112. This sliding motion further pushes the first clamping block 312 inwards towards the workpiece 4, achieving a tighter and more uniform clamping. When processing is complete or workpiece 4 needs to be released, the second drive unit 3114 is stopped first, allowing the second rotating part 3113 to return to its initial position under the reset action of the second elastic member 3113a. Then, the driving of the first driving part 3111 is stopped, the first rotating part 3112 stops rotating, and the first clamping block 312 releases the clamping force on the workpiece 4 under the reset action of the first elastic element, so that the workpiece 4 can be easily removed.

[0075] Reference Figures 3 to 6 In some embodiments of the present invention, the second clamping mechanism 32 includes: a third driving member 321, a transmission member 322, and a clamping block assembly 323. The third driving member 321 is rotatably disposed below the mounting base 20 and is located at the lower end of the first driving member 311. The first driving member 311 can drive the third driving member 321 to rotate. There are two transmission members 322, which are disposed below the mounting base 20. One end of each transmission member 322 is connected to the third driving member 321, and the two transmission members 322 are located on opposite sides of the third driving member 321. The clamping block assemblies 323 are slidably disposed on the mounting base 20. There are two sets of clamping block assemblies 323, which are respectively connected to the other ends of the two transmission members 322. The third driving member 321 is used to drive the transmission member 322 to move, so that the transmission member 322 drives the clamping block assemblies 323 to abut against the outer surface of the workpiece 4 in the first direction and the inner surface in the second direction.

[0076] The core component of the second clamping mechanism 32 is the third driving member 321, which is designed to be rotatably mounted below the mounting base 20 and located at the lower end of the first driving member 311. This arrangement allows the first driving member 311 to drive the first rotating part 3112 while simultaneously driving the third driving member 321 to rotate. The third driving member 321 can be driven by a motor, hydraulic motor, or pneumatic motor, depending on the specific application scenario and requirements. The transmission member 322 is a key component connecting the third driving member 321 and the clamping block assembly 323. In this invention, two transmission members 322 are provided, located on opposite sides of the third driving member 321. One end of the transmission member 322 is connected to the third driving member 321, and the transmission member 322 can be driven to move through the rotational movement of the third driving member 321. The specific form of the transmission member 322 can be a linkage, gear and rack mechanism, chain and sprocket mechanism, etc., as long as it can realize the transmission of force and the conversion of displacement. The clamping block assembly 323 is a component that directly acts on the surface of the workpiece 4. This invention includes two sets of clamping block assemblies 323, which are slidably mounted on the mounting base 20. The two sets of clamping block assemblies 323 are respectively connected to the other ends of two transmission components 322. When the transmission components 322 are driven to move by the third driving component 321, the clamping block assemblies 323 also move accordingly. The inner surface of the clamping block assembly 323 is designed with a clamping surface that matches the shape of the workpiece 4 to ensure a tight fit against the surface of the workpiece 4 during clamping, providing a stable clamping force.

[0077] When workpiece 4 needs to be clamped, the first drive member 311 is activated first, driving the first rotating part 3112 to rotate. The rotating part 3112 then abuts against the first clamping block 312 via its cam-shaped outer periphery, achieving initial clamping of workpiece 4 in the first direction (e.g., the inner side). Simultaneously, the rotation of the first drive member 311 also drives the third drive member 321 to rotate. Next, the rotation of the third drive member 321 drives the two transmission members 322 to move. Since one end of the transmission member 322 is connected to the third drive member 321 and the other end is connected to the clamping block assembly 323, the movement of the transmission member 322 causes the clamping block assembly 323 to slide on the mounting base 20. One set of clamping block assemblies 323 moves towards the first direction (e.g., the outer side) of workpiece 4, while the other set moves towards the second direction (e.g., the inner side, but on a different surface than the first clamping block 312), thus achieving simultaneous clamping of workpiece 4 in both directions. When processing is complete or workpiece 4 needs to be released, simply stop driving the first drive member 311, causing the first rotating part 3112 and the third drive member 321 to stop rotating. At this time, due to the connection between the transmission member 322 and the clamping block assembly 323 and the sliding design on the mounting base 20, the clamping block assembly 323 will automatically return to its initial position under the action of gravity or a suitable reset mechanism, releasing the clamping force on workpiece 4, and workpiece 4 can be easily removed.

[0078] Furthermore, refer to Figure 3 as well as Figures 5 to 6 In some embodiments of the present invention, the transmission component 322 includes a first connecting rod 3221, a second connecting rod 3222, a third connecting rod 3223, and a fourth connecting rod 3224. One end of the first connecting rod 3221 is connected to the third driving component 321; the second connecting rod 3222 is slidably disposed at the lower end of the mounting base 20, and one end of the second connecting rod 3222 is connected to the other end of the first connecting rod 3221; two third connecting rods 3223 are provided, one end of the two third connecting rods 3223 is connected to the other end of the second connecting rod 3222, and the other ends of the two third connecting rods 3223 are respectively connected to the clamping block assembly 323; the fourth connecting rod 3224 is slidably disposed in the mounting base 20, and the clamping block assembly 323 includes two second clamping blocks 3231, the two second clamping blocks 3231 are respectively connected to the third connecting rod 3223 through the fourth connecting rod 3224, and one end of the fourth connecting rod 3224 is connected to the second clamping block 3231.

[0079] The first link 3221 is the starting component in the transmission component 322, with one end directly connected to the third drive component 321. When the third drive component 321 is driven to rotate, the first link 3221 will rotate or swing accordingly, thereby transmitting the driving force to the subsequent components. The material and size of the first link 3221 need to be selected according to actual requirements to ensure that it can withstand sufficient driving force and torque. The second link 3222 is slidably disposed at the lower end of the mounting base 20. This sliding design allows the second link 3222 to move along a predetermined trajectory when subjected to driving force. One end of the second link 3222 is connected to the other end of the first link 3221. Through the rotation or swing of the first link 3221, the second link 3222 will be driven to slide. The sliding direction and distance of the second link 3222 depend on the rotation angle of the first link 3221 and the driving method of the third drive component 321. There are two third links 3223, which are respectively connected to the other end of the second link 3222. One end of each of the two third links 3223 is connected to the second link 3222, forming a forked structure. This design allows the driving force to be transmitted simultaneously to both clamping block assemblies 323. The other end of each third link 3223 is connected to a clamping block assembly 323. Through the transmission of the third links 3223, the clamping block assembly 323 receives a driving force and moves, thus clamping or releasing the workpiece 4. The fourth link 3224 is a key component connecting the third link 3223 and the second clamping block 3231. It is slidably disposed in the mounting base 20. This sliding design allows the fourth link 3224 to move stably when subjected to a driving force. The clamping block assembly 323 includes two second clamping blocks 3231, which are connected to the third link 3223 via the fourth link 3224. One end of the fourth link 3224 is connected to the second clamping block 3231, and the other end is connected to the third link 3223. Through the transmission of the fourth link 3224, the driving force of the third link 3223 is converted into the moving force of the second clamping block 3231, thereby achieving the clamping or release of the workpiece 4.

[0080] When the third driving member 321 is driven to rotate, the first connecting rod 3221 will rotate or swing accordingly. The rotation or swing of the first connecting rod 3221 will drive the second connecting rod 3222 to slide at the lower end of the mounting base 20. The sliding of the second connecting rod 3222 will drive the two third connecting rods 3223 to move. Since the third connecting rods 3223 are connected to the clamping block assembly 323, the clamping block assembly 323 will also be driven and move. At the same time, the fourth connecting rod 3224 slides in the mounting base 20, transmitting the driving force of the third connecting rods 3223 to the second clamping block 3231, causing the second clamping block 3231 to move and abut against the workpiece 4. Through the above connection relationship and working principle, the present invention achieves stable driving and precise control of the clamping block assembly 323 by the transmission member 322. When it is necessary to clamp the workpiece 4, simply start the third drive component 321 to drive the clamping block assembly 323 to move and clamp the workpiece 4 through the transmission component 322; when it is necessary to release the workpiece 4, simply stop the third drive component 321 to allow the clamping block assembly 323 to return to its initial position under the action of the reset mechanism and release the workpiece 4.

[0081] Reference Figure 5 as well as Figure 6 In some embodiments of the present invention, the third link 3223 has an oblong hole 3223a, the length direction of which extends along the length direction of the third link 3223, and the fourth link 3224 is slidably disposed in the oblong hole 3223a.

[0082] The third link 3223, as a crucial component of the transmission element 322, directly affects the transmission efficiency and stability of the clamp. In this invention, the third link 3223 is specifically designed with an oblong hole 3223a. The oblong hole 3223a is an elongated hole whose length extends along the length direction of the third link 3223. This design not only reduces the weight of the third link 3223 and lowers manufacturing costs but also provides sufficient space for the sliding of the fourth link 3224. As a key component connecting the third link 3223 and the second clamping block 3231, the stability and accuracy of the sliding arrangement of the fourth link 3224 directly affect the clamping effect of the clamp. In this invention, the fourth link 3224 is cleverly slidably positioned within the oblong hole 3223a of the third link 3223. This configuration allows the fourth link 3224 to slide stably along the length of the oblong hole 3223a when subjected to driving force, thus accurately transmitting the driving force to the second clamping block 3231. When the third driving member 321 is driven to rotate, the first link 3221 will rotate or swing accordingly, thereby driving the second link 3222 to slide. The sliding of the second link 3222 will drive the two third links 3223 to move. Since the third link 3223 is provided with an oblong hole 3223a, and the fourth link 3224 is slidably disposed in the oblong hole 3223a, when the third link 3223 moves, the fourth link 3224 will slide along the oblong hole 3223a. This sliding design not only ensures the connection stability between the fourth link 3224 and the third link 3223, but also enables the fourth link 3224 to accurately transmit the driving force to the second clamping block 3231, achieving precise clamping or release of the workpiece 4.

[0083] Referring to some embodiments of the present invention, two third links 3223 are hinged to the second link 3222, and a fourth link 3224 is rotatably inserted through the other end of the third link 3223.

[0084] In this invention, the two third links 3223 are connected to the second link 3222 by a hinge. A hinge is a connection that allows two components to rotate relative to each other within a certain range; it can transmit driving force and accommodate certain angular changes. Specifically, the second link 3222 has hinge holes at both ends, while one end of each of the two third links 3223 has a hinge shaft that matches the hinge hole. Through the cooperation of the hinge shaft and the hinge hole, the two third links 3223 can flexibly connect to the second link 3222 and rotate relative to each other under the action of driving force. The fourth link 3224, as a key component connecting the third link 3223 and the second clamping block 3231, is designed in this invention to rotatably pass through the other end of the third link 3223. Specifically, the other end of the third link 3223 has a through hole, the diameter of which is slightly larger than the diameter of the fourth link 3224, allowing the fourth link 3224 to pass smoothly through the through hole. Meanwhile, a bearing or bushing or other rotating component is provided between the through hole and the fourth link 3224 to ensure that the fourth link 3224 can maintain a stable rotational state when passing through the through hole. This design not only ensures the connection stability between the fourth link 3224 and the third link 3223, but also makes the fourth link 3224 more flexible and efficient in transmitting driving force.

[0085] When the third driving member 321 is driven to rotate, the first connecting rod 3221 will rotate or swing accordingly, thereby driving the second connecting rod 3222 to slide. Since the second connecting rod 3222 is connected to the two third connecting rods 3223 by a hinge, when the second connecting rod 3222 slides, the two third connecting rods 3223 will rotate relative to each other around the hinge point. At the same time, since the fourth connecting rod 3224 can rotatably pass through the other end of the third connecting rod 3223, when the third connecting rod 3223 rotates, the fourth connecting rod 3224 will rotate accordingly and transmit the driving force to the second clamping block 3231. In this way, through the hinged and rotatable connection between the third connecting rod 3223, the second connecting rod 3222, and the fourth connecting rod 3224, the fixture can achieve quick and accurate clamping or release of the workpiece 4.

[0086] In some embodiments of the present invention, the second clamping mechanism 32 further includes two adjusting members (not shown in the figure). The two adjusting members are disposed on the two transmission members 322 and located between the two third links 3223. The adjusting members are used to adjust the included angle between the two third links 3223 to adjust the initial distance between the two second clamping blocks 3231.

[0087] The adjusting component is an important new addition to this invention, primarily used to adjust the included angle between the two third connecting rods 3223. Specifically, two adjusting components are respectively mounted on the two transmission components 322 and located between the two third connecting rods 3223. The adjusting component can be designed in various forms, such as bolts, nuts, adjusting screws, adjusting blocks, etc., as long as it can achieve the function of adjusting the included angle. In a preferred embodiment of this invention, the adjusting component is in the form of an adjusting screw, one end of which is fixedly connected to the transmission component 322, and the other end is connected to the third connecting rod 3223. By rotating the adjusting screw, its relative position with the third connecting rod 3223 can be changed, thereby adjusting the included angle between the two third connecting rods 3223.

[0088] When it is necessary to adjust the initial distance between the two second clamping blocks 3231, this can be achieved by operating the adjusting member. Specifically, first, loosen the fixed connection between the adjusting member and the transmission member 322 or the third link 3223 (e.g., loosen the nut), and then rotate the adjusting member (e.g., rotate the adjusting screw) to move it along the set direction. Since the adjusting member is located between the two third links 3223, its movement will cause the included angle between the two third links 3223 to change. By precisely controlling the moving distance and direction of the adjusting member, the included angle between the two third links 3223 can be precisely adjusted, thereby adjusting the initial distance between the two second clamping blocks 3231.

[0089] To better illustrate the adjusting component and its adjusting function of the present invention, a specific embodiment is given below. In this embodiment, the adjusting component takes the form of an adjusting screw, one end of which is fixedly connected to the transmission component 322 via a threaded connection, and the other end is connected to the third connecting rod 3223 via a bearing or bushing. When it is necessary to adjust the initial distance between the two second clamping blocks 3231, simply rotating the adjusting screw changes its relative position with the third connecting rod 3223, thereby achieving the adjustment of the included angle. By precisely controlling the number of rotations and direction of the adjusting screw, precise adjustment of the initial distance between the two second clamping blocks 3231 can be achieved.

[0090] With the introduction of the adjusting component, the workpiece quick positioning fixture 2 of the present invention has the following significant effects: By operating the adjusting component, the included angle between the two third connecting rods 3223 can be easily adjusted, thereby realizing flexible adjustment of the initial distance between the two second clamping blocks 3231 to meet the clamping requirements of different workpieces 4. The precise adjustment function of the adjusting component allows for more accurate control of the initial distance between the two second clamping blocks 3231, improving the clamping accuracy and processing efficiency of the fixture. The design of the adjusting component enables the fixture to adapt to workpieces 4 of different shapes, sizes, and processing requirements, enhancing the versatility and adaptability of the fixture. The operation of the adjusting component is simple and convenient, requiring no complex tools or skills, reducing the difficulty of operation and the cost of use.

[0091] Reference Figure 1 According to a second aspect embodiment of the present invention, a CNC machine tool 1 includes a workpiece rapid positioning fixture 2 as described in any of the embodiments of the first aspect. The present invention also provides a CNC machine tool 1, the key feature of which is that it is equipped with the workpiece rapid positioning fixture 2 as described in any of the first aspects. The following is a detailed description of specific embodiments of the CNC machine tool 1.

[0092] The CNC machine tool 1 of this invention mainly consists of a machine tool body, a control system, a drive system, and a workpiece rapid positioning fixture 2. The machine tool body is the basic structure of the CNC machine tool 1, supporting all other components and providing a stable machining environment. The control system is responsible for receiving operating commands and controlling the coordinated operation of all parts of the machine tool. The drive system provides power to the machine tool, driving the cutting tool and workpiece 4 to move relative to each other to complete the machining task. The workpiece rapid positioning fixture 2 is one of the key components of the CNC machine tool 1 of this invention; it is responsible for quickly and accurately positioning and clamping the workpiece 4, ensuring accuracy and efficiency during the machining process.

[0093] In the CNC machine tool 1 of this invention, the workpiece rapid positioning fixture 2 is integrated into the machine tool body and works closely with the machine tool's drive system, control system, etc. The installation position of the fixture can be designed according to specific processing requirements and machine tool structure to ensure that the fixture can easily clamp the workpiece 4 and form a reasonable processing path with the tool. At the same time, the connection between the fixture and the machine tool body is also carefully designed to ensure that the fixture remains stable during processing and will not loosen due to vibration or external force.

[0094] When the CNC machine tool 1 starts working, the machining instructions, including the shape, size, and machining path of the workpiece 4, are first input through the control system. Then, the drive system drives the tool and workpiece 4 to move relative to each other according to the instructions. During this process, the workpiece rapid positioning fixture 2 plays a crucial role. It first quickly positions the workpiece 4 using its unique positioning mechanism, and then firmly clamps the workpiece 4 in the predetermined position using the clamping mechanism. In this way, even during high-speed machining, the workpiece 4 remains stable and will not shift due to vibration or external forces, thus ensuring machining accuracy and efficiency.

[0095] Furthermore, it is understood that the CNC machine tool 1 according to the embodiments of the present invention has at least the following beneficial effects: The CNC machine tool 1 is connected to the second clamping mechanism 32 via the first clamping mechanism 31. This allows the first clamping mechanism 31 to be driven so that it abuts against the inner surface of the workpiece 4 in the first direction, while simultaneously driving the second clamping mechanism 32 so that it abuts against the outer surface of the workpiece 4 in the first direction and the inner surface in the second direction. The operator only needs to drive the first clamping mechanism 31 to simultaneously drive both the first clamping mechanism 31 and the second clamping mechanism 32. While the first clamping mechanism 31 and the second clamping mechanism 32 simultaneously clamp the workpiece 4, the workpiece 4 is also precisely positioned on the mounting base 20, thereby achieving the purpose of quickly clamping the workpiece 4, shortening the clamping time, and thus improving production efficiency.

[0096] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A workpiece quick positioning fixture, characterized in that, include: A fixed base (10) having a rotation center is fixed to a machine tool; Mounting base (20), said mounting base (20) is mounted on said fixed base (10), said mounting base (20) has a first direction and a second direction that are perpendicular to each other; and A clamping assembly (30) is disposed in the mounting base (20). The clamping assembly (30) has two clamping stations (21) which are arranged opposite to each other along the first direction of the mounting base. The clamping assembly (30) is used to clamp and position the workpiece (4) on the clamping stations (21). The clamping assembly (30) includes: A first clamping mechanism (31) is disposed at the center of the mounting base (20), and the center of the first clamping mechanism (31) coincides with the rotation center of the fixed base (10). The first clamping mechanism (31) is used to abut against the inner surface of the workpiece (4) in the first direction; and The second clamping mechanism (32) is disposed on the mounting base (20). The second clamping mechanism (32) is located on opposite sides of the first clamping mechanism (31). The second clamping mechanism (32) is used to abut against the outer surface of the workpiece (4) in the first direction and the inner surface in the second direction. The first clamping mechanism (31) is connected to the second clamping mechanism (32) and drives the first clamping mechanism (31) so that the first clamping mechanism (31) and the second clamping mechanism (32) abut against the outer surface of the workpiece (4) at the same time. The first clamping mechanism (31) includes: A first driving member (311) is rotatably mounted on the mounting base (20), and the rotation center of the first driving member (311) coincides with the rotation center of the fixed base (10). Two first clamping blocks (312) are provided. The two first clamping blocks (312) are slidably disposed on the mounting base (20). The two first clamping blocks (312) extend along the second direction. The two first clamping blocks (312) are respectively disposed on both sides of the first driving member (311) in the first direction. The two first clamping blocks (312) are connected by a first elastic member. The outer surface of the first driving member (311) abuts against the inner surface of the first clamping block (312). The outer surface of the first clamping block (312) abuts against the inner surface of the workpiece (4). The second clamping mechanism (32) includes: The third driving member (321) is rotatably disposed below the mounting base (20). The third driving member (321) is disposed at the lower end of the first driving member (311). The first driving member (311) can drive the third driving member (321) to rotate. A transmission component (322), wherein two transmission components (322) are provided, the two transmission components (322) are disposed below the mounting base (20), one end of the two transmission components (322) is connected to the third driving component (321), and the two transmission components (322) are respectively located on opposite sides of the third driving component (321); and Clamping block assembly (323) is slidably disposed on the mounting base (20). There are two sets of clamping block assembly (323). The two sets of clamping block assembly (323) are respectively connected to the other end of the two transmission members (322). The third driving member (321) is used to drive the transmission member (322) to move so that the transmission member (322) drives the clamping block assembly (323) to abut against the outer surface of the workpiece (4) in the first direction and the inner surface in the second direction respectively.

2. The workpiece quick positioning fixture according to claim 1, characterized in that, The first driving element (311) includes: A first drive unit (3111), the upper end of which is located on the mounting base (20); and The first rotating part (3112) is connected to the lower end of the first driving part (3111). The first driving part (3111) is used to drive the first rotating part (3112). The outer peripheral side of the first rotating part (3112) is cam-shaped, and the outer arc surface of the first rotating part (3112) abuts against the first clamping block (312).

3. The workpiece quick positioning fixture according to claim 2, characterized in that, The first driving element (311) further includes: The second rotating part (3113) is movably disposed between the first rotating part (3112). Two second rotating parts (3113) are provided, and the two second rotating parts (3113) are rotationally symmetrical about the rotation center. The outer periphery of the second rotating part (3113) is cam-shaped. The two second rotating parts (3113) are connected by a second elastic member (3113a), and the two second rotating parts (3113) are slidably connected to the first rotating part (3112). The second driving part (3114) is sleeved on the first driving part (3111). The lower outer periphery of the second driving part (3114) is provided with a second driving member (3114a). The second driving member (3114a) is located between the two second rotating parts (3113). The outer periphery of the second driving member (3114a) is cam-shaped. The outer side of the second driving member (3114a) abuts against the inner surface of the second rotating part (3113). The second driving part (3114) is used to drive the second driving member (3114a). The second driving member (3114a) rotates so that the two second rotating parts (3113) slide outward relative to the first rotating part (3112).

4. The workpiece quick positioning fixture according to claim 1, characterized in that, The transmission component (322) includes: The first link (3221) has one end connected to the third drive member (321); A second link (3222) is slidably disposed at the lower end of the mounting base (20), one end of the second link (3222) being connected to the other end of the first link (3221); and Two third links (3223) are provided, one end of each third link (3223) is connected to the other end of the second link (3222), and the other ends of each third link (3223) are respectively connected to the clamping block assembly (323); and The fourth link (3224) is slidably disposed in the mounting base (20). The clamping block group (323) includes two second clamping blocks (3231). The two second clamping blocks (3231) are respectively connected to the third link (3223) through the fourth link (3224). One end of the fourth link (3224) is connected to the second clamping block (3231).

5. The workpiece quick positioning fixture according to claim 4, characterized in that, The third link (3223) has an oblong hole (3223a), the length direction of which extends along the length direction of the third link (3223), and the fourth link (3224) is slidably disposed in the oblong hole (3223a).

6. The workpiece quick positioning fixture according to claim 4, characterized in that, The two third links (3223) are hinged to the second link (3222), and the fourth link (3224) is rotatably inserted through the other end of the third link (3223).

7. The workpiece quick positioning fixture according to claim 6, characterized in that, The second clamping mechanism (32) further includes two adjusting members, which are disposed on the two transmission members (322) and located between the two third links (3223). The adjusting members are used to adjust the included angle between the two third links (3223) to adjust the initial distance between the two second clamping blocks (3231).

8. A CNC machine tool, characterized in that, Includes the workpiece quick positioning fixture (2) as described in any one of claims 1 to 7.

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