Rotary clamp for numerical control lathe

Abstract

The utility model relates to the technical field of rotary type clamps, and discloses a rotary type clamp for a numerically controlled lathe, which comprises a chuck, a clamping mechanism is arranged in the chuck, a control mechanism is arranged on the outer side of the chuck, a three-jaw outer clamping assembly comprises an inner clamping cavity, the inner clamping cavity is arranged on one side in the chuck, and the control mechanism is arranged on the outer side of the chuck. An adjusting disc is rotationally connected to the inner wall of the right side of the inner clamping cavity, a three-jaw arc groove is formed in the left side of the adjusting disc, a straight opening sliding groove is formed in the inner wall of the chuck, and the functions of inward clamping and outward opening can be achieved at the same time through the combined design of the three-jaw outer clamping assembly and the inner supporting assembly. According to the bidirectional clamping mechanism, the clamping stability of the tubular workpiece is remarkably enhanced, the problem that the workpiece is likely to loosen or shift in a traditional unidirectional clamping mode is effectively avoided, a hydraulic system is introduced to serve as a power source, the clamping process is more rapid and uniform in pressure transmission through a hydraulic driving mode, and the clamping efficiency is improved. And the stability and the precision of the pipe workpieces in the machining process are ensured.

Description

Technical Field

[0001] This utility model relates to the field of rotary fixture technology, specifically a rotary fixture for CNC lathes. Background Technology

[0002] A rotary fixture for CNC lathes is a precision mechanical device specifically designed for CNC lathes. It is used to clamp and rotate workpieces for various turning, milling, drilling, and other machining operations. This device plays a crucial role in the CNC lathe machining process. A rotary fixture for CNC lathes typically consists of a chuck, clamping mechanism, transmission device, positioning elements, and a control system. The chuck is the core component of the fixture, used to directly clamp the workpiece and securely fix it in place through the clamping mechanism. The transmission device transmits power to the chuck, enabling it to rotate the workpiece. The positioning elements ensure accurate installation and positioning of the fixture on the CNC lathe. The control system receives commands from the CNC lathe and controls the clamping, releasing, and rotating actions of the fixture.

[0003] Since the advent of lathe machining technology, radial runout has been unavoidable during turning. This is mostly caused by insufficient contact between the chuck jaws and the workpiece, resulting in the inability to overcome the radial runout caused by the workpiece's centrifugal force. For steel of general precision, this has little impact. However, for high-precision workpieces, traditional fixtures cannot provide a more stable clamping effect. This may lead to unstable depth of cut during workpiece machining, resulting in uneven cutting depth and potential draft issues, making it difficult to meet the requirements of high-precision machining. Utility Model Content

[0004] The purpose of this invention is to provide a rotary fixture for CNC lathes to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a rotary fixture for a CNC lathe, comprising a chuck, wherein a clamping mechanism is provided inside the chuck and a control mechanism is provided outside the chuck;

[0006] The clamping mechanism includes a three-jaw outer clamping assembly and an inner support assembly, wherein the three-jaw outer clamping assembly is disposed on one side of the inner support assembly;

[0007] The three-jaw external clamping assembly includes an inner clamping cavity, which is located inside one side of the chuck. An adjustment disc is rotatably connected to the right inner wall of the inner clamping cavity. A three-jaw arc groove is provided on the left side of the adjustment disc. A straight sliding groove is provided on the inner wall of the chuck, located on the left side of the inner clamping cavity. A rotating block is slidably connected inside the three-jaw arc groove. A square block is slidably connected inside the straight sliding groove. A clamping platform is fixedly connected between the square block and the rotating block. One end of the clamping platform extends through the inner wall of the chuck to the inner side of the chuck, and a rotating jaw is rotatably connected to one end of the clamping platform.

[0008] Preferably, the chuck has a sliding opening on its inner side that is the same size as the clamping platform.

[0009] Preferably, the inner support assembly includes an inner support claw cavity, which is located inside the chuck on the side away from the inner clamping cavity. A turntable is rotatably connected to the left side of the inner support claw cavity, and a multi-arc groove is formed on the right side of the turntable. A linear groove is formed on the inner wall of the chuck, located on the right side of the inner support claw cavity. A sliding column is slidably connected inside the linear groove. A sliding table is fixedly connected to one side of the sliding column, and the sliding table is slidably connected inside the multi-arc groove. A slider is fixedly connected to one side of the sliding column, and one end of the slider extends through the inner wall of the chuck to the inner side of the chuck. A top claw is rotatably connected to one end of the slider.

[0010] Preferably, the chuck has a sliding opening on its inner side that is the same size as the slider.

[0011] Preferably, one end of the slider is fixedly connected to a columnar structure, and one end of the columnar structure is provided with a rod-shaped structure, and the top claw is rotatably connected to the outer wall of the rod-shaped structure.

[0012] Preferably, the control mechanism includes an external port and a drag rod. The external port is located on the outer wall of the chuck. The drag rod is fixedly connected to the outer walls of the adjusting plate and the turntable, respectively. The drag rod is slidably connected to the external port. A flow divider is fixedly connected to the outer wall of the chuck. A connecting groove is provided inside the flow divider. A sliding rod is slidably connected inside the connecting groove. A traction block is rotatably connected to the end of the sliding rod. The traction block is slidably connected to the inner wall of the drag rod. A transfer ring is rotatably connected to the outer wall of the chuck. A sleeve is rotatably connected to one side of the transfer ring. A pressure-delivering pipe is connected between the sleeve and the connecting groove. A pressure source pipe is connected to the outer wall of the transfer ring.

[0013] Preferably, the inner side of the tow rod is provided with a sliding groove.

[0014] Compared with the prior art, this utility model provides a rotary fixture for CNC lathes, which has the following advantages:

[0015] The combined design of the three-jaw external clamping assembly and the internal support assembly enables simultaneous inward clamping and outward expansion. This bidirectional clamping mechanism significantly enhances the clamping stability of tubular workpieces, effectively avoiding workpiece loosening or displacement problems that may occur with traditional unidirectional clamping methods, thus ensuring high precision and efficiency during machining. The coordinated work of the three-jaw external clamping assembly and the internal support assembly allows the workpiece to better maintain its original shape and dimensional accuracy under uniformly distributed clamping force. Especially in precision machining processes such as turning, this stable clamping state helps reduce machining errors caused by workpiece deformation or vibration, thereby improving the machining accuracy and quality of the final product.

[0016] By introducing a hydraulic system as the power source, the hydraulic drive makes the clamping process faster and the pressure transmission more uniform, ensuring the stability and accuracy of tubular workpieces during processing. This efficient and stable clamping method helps improve production efficiency and reduce scrap rate. The use of a transfer ring and pressure-distributing pipe solves the problem of hydraulic transmission during chuck rotation. This ensures that hydraulic pressure can continuously and stably act on the clamping table and slide during chuck rotation, thereby achieving continuous and uniform clamping of the workpiece. This improves the practicality and reliability of the fixture. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a structural schematic diagram from another perspective of the present invention;

[0020] Figure 3 This is a cross-sectional structural diagram of the present invention;

[0021] Figure 4 This is a schematic diagram of the structure of the turntable in this utility model;

[0022] Figure 5 This is a schematic diagram of the slide bar in this utility model.

[0023] In the diagram: 1. Chuck; 2. Clamping mechanism; 21. Three-jaw external clamping assembly; 201. Inner clamping cavity; 202. Adjusting plate; 203. Three-jaw arc groove; 204. Straight-mouth slide groove; 205. Rotating block; 206. Square block; 207. Clamping platform; 208. Rotating claw; 22. Inner support assembly; 221. Inner support claw cavity; 222. Turntable; 223. Multi-arc groove; 224. Linear groove; 225. Sliding column; 226. Sliding table; 227. Sliding block; 228. Top claw; 3. Control mechanism; 301. Outer opening; 302. Dragging rod; 303. Diverter box; 304. Connecting groove; 305. Sliding rod; 306. Traction block; 307. Transfer ring; 308. Sleeve plate; 309. Pressure delivery pipe; 310. Pressure source pipe. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances. Example

[0026] Please see Figure 1-5 This utility model provides a technical solution: a rotary fixture for a CNC lathe, including a chuck 1, a clamping mechanism 2 inside the chuck 1, and a control mechanism 3 outside the chuck 1;

[0027] The clamping mechanism 2 includes a three-jaw outer clamping assembly 21 and an inner support assembly 22, with the three-jaw outer clamping assembly 21 disposed on one side of the inner support assembly 22;

[0028] The three-jaw external clamping assembly 21 includes an inner clamping cavity 201, which is located inside one side of the chuck 1. An adjusting plate 202 is rotatably connected to the right inner wall of the inner clamping cavity 201. A three-jaw arc groove 203 is provided on the left side of the adjusting plate 202. A straight sliding groove 204 is provided on the inner wall of the chuck 1, located on the left side of the inner clamping cavity 201. A rotating block 205 is slidably connected inside the three-jaw arc groove 203. A square block 206 is slidably connected inside the straight sliding groove 204. The square block 206 and the rotating block 205 are connected to each other. A clamping platform 207 is fixedly connected between 05. One end of the clamping platform 207 extends through the inner wall of the chuck 1 to the inner side of the chuck 1. A rotating jaw 208 is rotatably connected to one end of the clamping platform 207. After the adjustment plate 202 is rotated, the three-jaw arc groove 203 pushes the rotating block 205 to move. The rotating block 205 drives the clamping platform 207 to move. The square block 206 restricts the movement trajectory of the clamping platform 207, so that the rotating jaws 208 can approach each other directly. The rotating jaws 208 can rotate to better fit the outer surface of the workpiece.

[0029] Furthermore, the chuck 1 has a sliding opening on its inner side that is the same size as the clamping platform 207.

[0030] Furthermore, the inner support assembly 22 includes an inner support claw cavity 221, which is located inside the chuck 1 on the side away from the inner clamping cavity 201. A turntable 222 is rotatably connected to the left side of the inner support claw cavity 221. A multi-arc groove 223 is formed on the right side of the turntable 222. A linear groove 224 is formed on the inner wall of the chuck 1, located on the right side of the inner support claw cavity 221. A sliding column 225 is slidably connected inside the linear groove 224. A sliding table 226 is fixedly connected to one side of the sliding column 225. 226 is slidably connected inside the multi-arc groove 223. A slider 227 is fixedly connected to one side of the sliding column 225. One end of the slider 227 extends through the inner wall of the chuck 1 to the inner side of the chuck 1. A top claw 228 is rotatably connected to one end of the slider 227. The inner support component 22 and the three-jaw outer clamping component 21 are arranged in opposite directions to facilitate the movement of the slider 227 and the clamping platform 207 in opposite directions when the turntable 222 and the adjusting plate 202 move in the same direction. The inner support component 22 and the three-jaw outer clamping component 21 work on the same principle.

[0031] Furthermore, the chuck 1 has a sliding opening on its inner side that is the same size as the slider 227.

[0032] Furthermore, a columnar structure is fixedly connected to one end of the slider 227, and a rod-shaped structure is provided at one end of the columnar structure, with the top claw 228 rotatably connected to the outer wall of the rod-shaped structure. Example

[0033] Please see Figure 1-5Furthermore, in conjunction with Embodiment 1, the control mechanism 3 includes an external port 301 and a drag bar 302. The external port 301 is located on the outer wall of the chuck 1. The drag bar 302 is fixedly connected to the outer walls of the adjusting plate 202 and the turntable 222, respectively. The drag bar 302 is slidably connected to the external port 301. A diversion box 303 is fixedly connected to the outer wall of the chuck 1. A connecting groove 304 is provided inside the diversion box 303. A sliding rod 305 is slidably connected inside the connecting groove 304. A traction block 306 is rotatably connected to the end of the sliding rod 305. The traction block 306 is slidably connected to the inner wall of the drag bar 302. A transfer ring 307 is rotatably connected to the outer wall of the chuck 1. A sleeve plate 308 is rotatably connected to the side. A pressure-receiving pipe 309 is connected between the sleeve plate 308 and the connecting groove 304. A pressure source pipe 310 is connected to the outer wall of the transmission ring 307. The transmission ring 307 is used to transmit hydraulic pressure so that the chuck 1 will not be interfered with by the pressure-receiving pipe 309 during rotation. The hydraulic pressure is delivered to the inside of the connecting groove 304 through the transmission ring 307. The hydraulic pressure drives the clamping platform 207 and the slider 227 to produce displacement. After the clamping platform 207 and the slider 227 both come into contact with the workpiece, the hydraulic pressure can be used to clamp the workpiece. The clamping process is quick and the pressure is transmitted evenly, which can ensure that the tubular workpiece is clamped better, thus facilitating precision machining.

[0034] Furthermore, a sliding groove is provided on the inner side of the tow bar 302.

[0035] In actual operation, when this device is used, since the pressure supply device is generally fixed, in order to avoid the difficulty in transmitting hydraulic pressure when the chuck 1 rotates, the user can fix the transmission ring 307 and use the movement of the pressure delivery pipe 309 to drive the rotation of the sleeve plate 308 to counteract the interference. The user places the tubular workpiece between the outside of the top claw 228 and the inside of the rotating claw 208. Then, the user applies hydraulic pressure to the pressure source pipe 310, and the hydraulic pressure pushes the slide rod 305 to move. The slide rod 305 drives the adjustment plate 202 and the turntable 222 to rotate. Since the hydraulic drive of the adjustment plate 202 and the turntable 222 is connected, they can be subjected to the same force and can clamp the workpiece at the same time, providing stability for workpiece processing.

[0036] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A rotary fixture for a CNC lathe, comprising a chuck (1), characterized in that: The chuck (1) is provided with a clamping mechanism (2) inside and a control mechanism (3) is provided on the outside of the chuck (1). The clamping mechanism (2) includes a three-jaw outer clamping assembly (21) and an inner support assembly (22), wherein the three-jaw outer clamping assembly (21) is disposed on one side of the inner support assembly (22); The three-jaw external clamping assembly (21) includes an inner clamping cavity (201), which is located inside the chuck (1) on one side. An adjustment plate (202) is rotatably connected to the inner wall of the right side of the inner clamping cavity (201). A three-jaw arc groove (203) is provided on the left side of the adjustment plate (202). A straight sliding groove (204) is provided on the inner wall of the chuck (1). The straight sliding groove (204) is located on the left side of the inner clamping cavity (201). A rotating block (205) is slidably connected inside the three-jaw arc groove (203). A square block (206) is slidably connected inside the straight sliding groove (204). A clamping platform (207) is fixedly connected between the square block (206) and the rotating block (205). One end of the clamping platform (207) extends through the inner wall of the chuck (1) to the inner side of the chuck (1). A rotating jaw (208) is rotatably connected to one end of the clamping platform (207).

2. The rotary fixture for a CNC lathe according to claim 1, characterized in that: The chuck (1) has a sliding opening on its inner side that is the same size as the clamping platform (207).

3. A rotary fixture for a CNC lathe according to claim 1, characterized in that: The inner support assembly (22) includes an inner support claw cavity (221), which is located inside the chuck (1) on the side away from the inner clamping cavity (201). A turntable (222) is rotatably connected to the left side of the inner support claw cavity (221). A multi-arc groove (223) is provided on the right side of the turntable (222). A linear groove (224) is provided on the inner wall of the chuck (1), and the linear groove (224) is located on the right side of the inner support claw cavity (221). The linear groove (224) is slidably connected to a sliding column (225), and a sliding table (226) is fixedly connected to one side of the sliding column (225). The sliding table (226) is slidably connected inside the multi-arc groove (223). A slider (227) is fixedly connected to one side of the sliding column (225). One end of the slider (227) extends through the inner wall of the chuck (1) to the inner side of the chuck (1). One end of the slider (227) is rotatably connected to a top claw (228).

4. A rotary fixture for a CNC lathe according to claim 3, characterized in that: The chuck (1) has a sliding opening on its inner side that is the same size as the slider (227).

5. A rotary fixture for a CNC lathe according to claim 3, characterized in that: One end of the slider (227) is fixedly connected to a columnar structure, and one end of the columnar structure is provided with a rod-shaped structure. The top claw (228) is rotatably connected to the outer wall of the rod-shaped structure.

6. A rotary fixture for a CNC lathe according to claim 1, characterized in that: The control mechanism (3) includes an external port (301) and a drag bar (302). The external port (301) is located on the outer wall of the chuck (1). The drag bar (302) is fixedly connected to the outer walls of the adjusting plate (202) and the turntable (222), respectively. The drag bar (302) is slidably connected to the external port (301). A flow divider box (303) is fixedly connected to the outer wall of the chuck (1). A connecting groove (304) is provided inside the flow divider box (303). The connecting groove (304) slides inside the flow divider box (304). A sliding rod (305) is connected, and a traction block (306) is rotatably connected to the end of the sliding rod (305). The traction block (306) is slidably connected to the inner wall of the drag rod (302). A transfer ring (307) is rotatably connected to the outer wall of the chuck (1). A sleeve plate (308) is rotatably connected to one side of the transfer ring (307). A pressure-delivering pipe (309) is connected between the sleeve plate (308) and the connecting groove (304). A pressure-generating pipe (310) is connected to the outer wall of the transfer ring (307).

7. A rotary fixture for a CNC lathe according to claim 6, characterized in that: The inner side of the tow rod (302) is provided with a sliding groove.

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