Multi-station clamping jig structure of multi-axis numerical control machine tool

Abstract

The utility model discloses a multi-station clamping jig structure of a multi-axis numerical control machine tool, and relates to the technical field of clamping jigs, the multi-station clamping jig structure of the multi-axis numerical control machine tool comprises a rotating table, a clamping mechanism is arranged in the middle of the rotating table and used for clamping and fixing workpieces machined by the multi-axis numerical control machine tool, and the clamping mechanism is used for clamping and fixing the workpieces machined by the multi-axis numerical control machine tool. The rotary clamping assembly comprises a driven bevel gear fixedly installed at the bottom end of the rotary table, and a driving assembly is arranged on one side of the driven bevel gear. When the rotary table rotates, a driving rod moves along the track of a cam groove, a clamping jaw is opened at the protruding position of the cam groove, a workpiece is convenient to take and place, and when the rotary table is in other positions, the clamping jaw automatically clamps the workpiece; by means of the structural design, it can be guaranteed that the clamping jaw stably clamps the workpiece, shaking in the machining process is reduced, the machining precision is improved, the servo motor can be synchronously controlled to drive the workpiece to switch stations, different machining requirements of the multi-axis numerical control machine tool are met, multi-station continuous synchronous machining is achieved, and the production efficiency is remarkably improved.

Description

Technical Field

[0001] This utility model relates to the field of clamping fixture technology, specifically a multi-station clamping fixture structure for a multi-axis CNC machine tool. Background Technology

[0002] Multi-axis CNC machine tools, as key equipment in modern manufacturing, are CNC machine tools with multiple coordinate axes. These coordinate axes include both linear and rotary axes, enabling the machine tool to perform multi-directional and multi-angle cutting operations on workpieces within a complex spatial range.

[0003] Referring to the patent document: Patent Publication No. CN217966652U, Patent Publication Date 2022-12-06, a clamping fixture with a multi-position displacement structure is provided, including a support base. Two sets of moving mechanisms are provided at the top center of the support base. Each set of moving mechanisms has a first workpiece clamping position at its top. Slide grooves are provided on both sides of the top of the support base. Two sets of auxiliary mechanisms are installed inside the slide grooves. A second workpiece clamping position is installed on the top of the two sets of auxiliary mechanisms. A mounting block moves on a strip block and is fixed by fastening bolts and moving blocks, thereby moving and fixing the position at the top of the mounting block, thus adapting to clamping different workpieces. A drive motor drives a lead screw to rotate, which drives a slider to move within the slide grooves and auxiliary grooves. The slider moves the top position. Because auxiliary mechanisms are provided on both sides, it is easy to move the position, thereby clamping different workpieces.

[0004] Based on the search of patent numbers and the shortcomings of existing technologies, the following was found:

[0005] Currently, in practical use, the multi-station clamping fixture structure of traditional multi-axis CNC machine tools typically uses an independent drive mechanism to control the movement of the grippers at each station. For example, the grippers are directly driven to open and close by a cylinder or hydraulic cylinder. Although this can achieve the basic workpiece clamping function, each gripper needs to be equipped with an independent drive device, resulting in a complex fixture structure and high cost. At the same time, the poor synchronization of multiple drive sources can easily lead to uneven clamping force or positioning deviation. Furthermore, after machining, the workpiece is prone to getting stuck in the groove of the clamping fixture due to cutting force or thermal deformation, making it difficult to remove the machined workpiece.

[0006] Therefore, this utility model provides a multi-station clamping fixture structure for a multi-axis CNC machine tool. Utility Model Content

[0007] To address the problems of traditional multi-station clamping fixtures, which typically employ independent drives, resulting in complex structures, high costs, poor synchronization, and workpiece jamming after processing, this invention aims to provide a multi-station clamping fixture structure for multi-axis CNC machine tools.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a multi-station clamping fixture structure for a multi-axis CNC machine tool, comprising a rotary table, wherein a clamping mechanism is provided in the middle of the rotary table for clamping and fixing workpieces processed by the multi-axis CNC machine tool, the clamping mechanism comprising:

[0009] The rotary clamping assembly includes a driven bevel gear fixedly installed at the bottom of the rotary table, a drive assembly on one side of the driven bevel gear, a rotating frame rotatably installed in the middle of the rotary table, a cam groove on the upper part of the rotating frame, several positioning blocks fixedly installed at the top of the rotary table, a fixing block fixedly installed on one side of the top of each of the positioning blocks, two symmetrically distributed grippers rotatably installed on both sides of each of the fixing blocks, a drive rod slidably passing through the middle of each of the fixing blocks, one end of each of the drive rods slidably locked in the middle of the cam groove, a telescopic block fixedly installed on the other end of each of the drive rods, connecting rods movably installed at both ends of each of the telescopic blocks, and both ends of each of the connecting rods movably installed in the middle of one side of each gripper.

[0010] The lifting assembly, located in the middle of the positioning block, facilitates the removal of the workpiece by the operator.

[0011] Preferably, the lifting assembly includes several electric push rods fixedly installed on the upper part of the rotating platform, a top plate is slidably engaged in the middle of several positioning blocks, and the bottom center of several top plates is fixedly installed on the drive end of the electric push rods.

[0012] Preferably, the bottom end of the rotary table is rotatably mounted on a base, and the bottom end of the rotating frame is fixedly mounted on the lower middle surface of the base.

[0013] Preferably, the drive assembly includes a servo motor fixedly mounted on one side of the upper part of the base, and a driving bevel gear is fixedly mounted on the drive end of the servo motor, with the driving bevel gear and the driven bevel gear meshing with each other.

[0014] Preferably, a limiting plate is fixedly installed at the top center of the rotating frame, and one end of the drive rod is in contact with the lower surface of the limiting plate.

[0015] Preferably, the positioning block has a groove in the middle that matches the workpiece being processed, and the outer surface of the groove is provided with anti-slip texture.

[0016] Beneficial effects

[0017] This utility model provides a multi-station clamping fixture structure for a multi-axis CNC machine tool. Compared with the prior art, it has the following advantages:

[0018] 1. This application uses a servo motor to drive an active bevel gear, which in turn drives a driven bevel gear and a rotary table to rotate. By utilizing the cooperation between the drive rod and the cam groove, the gripper can achieve precise opening and closing. When the rotary table rotates, the drive rod moves along the cam groove trajectory. The gripper opens at the protrusion of the cam groove to facilitate the picking up and placing of the workpiece. At other positions, the gripper automatically clamps. This structural design not only ensures stable gripping of the workpiece by the gripper, reduces shaking during processing, and improves processing accuracy, but also synchronously controls the servo motor to drive the workpiece to switch positions. This reduces the use of drive components, lowers the production cost of clamping fixtures, and can meet the different processing needs of multi-axis CNC machine tools, enabling continuous synchronous processing at multiple positions and significantly improving production efficiency.

[0019] 2. After the workpiece is processed, the electric actuator drives the top plate to move upward, pushing the workpiece out of the slot of the positioning block. This makes it easy for the operator to remove the workpiece, avoiding the problem of difficulty in removing the workpiece due to jamming. At the same time, the design of the top plate surface is corrosion-resistant, wear-resistant and has rounded edges, which can prevent scratches to the operator and avoid damage to the workpiece, effectively improving the safety of operation and the yield of finished workpieces, and optimizing the working experience of the entire processing flow. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model.

[0021] Figure 2 This is a schematic diagram of the cross-sectional structure of the base of this utility model.

[0022] Figure 3 This is a schematic diagram of the cross-sectional structure of the limiting plate of this utility model.

[0023] Figure 4 This is a schematic diagram of the structure after the top plate and electric actuator are separated in this utility model.

[0024] In the diagram: 1. Rotary table; 2. Clamping mechanism; 21. Rotary clamping assembly; 211. Base; 212. Servo motor; 213. Driving bevel gear; 214. Driven bevel gear; 215. Rotating frame; 2151. Cam groove; 2152. Limiting plate; 216. Drive rod; 217. Fixing block; 218. Gripper; 2181. Telescopic block; 2182. Connecting rod; 219. Positioning block; 22. Lifting assembly; 221. Electric push rod; 222. Top plate. Detailed Implementation

[0025] 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.

[0026] Please see Figure 1-4 This utility model provides a technical solution: a multi-station clamping fixture structure for a multi-axis CNC machine tool, including a rotary table 1, with a clamping mechanism 2 in the middle of the rotary table 1 for clamping and fixing the workpiece being processed by the multi-axis CNC machine tool. The clamping mechanism 2 includes:

[0027] The rotary clamping assembly 21 includes a driven bevel gear 214 fixedly mounted at the bottom of the rotary table 1. A drive assembly is provided on one side of the driven bevel gear 214. A rotating frame 215 is rotatably mounted in the middle of the rotary table 1. A cam groove 2151 is provided on the upper part of the rotating frame 215. Several positioning blocks 219 are fixedly mounted at the top of the rotary table 1. A fixing block 217 is fixedly mounted on one side of the top of each of the positioning blocks 219. Two symmetrically distributed grippers 218 are rotatably mounted on both sides of each fixing block 217. Drive rods 216 are slidably inserted through the middle of 7. Drive rods 216 are used in conjunction with linear bearings and fixed blocks 217, which greatly reduces the frictional resistance during sliding and improves transmission efficiency and accuracy. One end of each drive rod 216 is slidably locked in the middle of the cam groove 2151. The other end of each drive rod 216 is fixedly installed with a telescopic block 2181. Both ends of each telescopic block 2181 are movably installed with connecting rods 2182. Both ends of each connecting rod 2182 are movably installed in the middle of one side of the gripper 218.

[0028] The lifting assembly 22 is located in the middle of the positioning block 219 to facilitate workers in removing the workpiece.

[0029] The lifting assembly 22 includes several electric push rods 221 fixedly installed on the upper part of the rotary table 1. A top plate 222 is slidably locked in the middle of several positioning blocks 219. The bottom center of the top plates 222 is fixedly installed on the drive end of the electric push rods 221. The electric push rods 221 are high-precision electric push rods with a stroke control accuracy of ±0.05mm. They have a self-locking function and can maintain stability during the lifting process to prevent the top plates 222 from sliding down. The surface of the top plates 222 has good corrosion resistance and wear resistance, and the edges of the top plates 222 are rounded to avoid scratching the staff or damaging the workpiece when picking up or placing the workpiece.

[0030] The bottom of the rotary table 1 is rotatably mounted with a base 211, and the bottom of the rotating frame 215 is fixedly mounted on the lower surface of the middle part of the base 211. The base 211 is the supporting foundation of the entire fixture structure. It is made of cast iron, which ensures the stability and rigidity of the base 211 and effectively reduces the error caused by vibration during the processing.

[0031] The drive assembly includes a servo motor 212 fixedly mounted on one side of the upper part of the base 211. The drive end of the servo motor 212 is fixedly mounted with an active bevel gear 213. The active bevel gear 213 and the driven bevel gear 214 mesh with each other. The servo motor 212 is a Kollmorgen AKM2G servo motor. In the multi-station clamping fixture structure, the high rated torque can ensure that when driving the driven bevel gear 214 and the rotary table 1 to rotate, it can stably overcome various resistances, including the inertial load brought by the rotating frame 215, the positioning block 219 and the workpiece, etc., to ensure the smoothness of the rotation process. This allows the drive rod 216 to move accurately along the trajectory of the cam groove 2151, so as to realize the stable and reliable clamping and releasing action of the gripper 218 on the workpiece.

[0032] A limiting plate 2152 is fixedly installed at the top center of the rotating frame 215. One end of the drive rod 216 is in contact with the lower surface of the limiting plate 2152. The limiting plate 2152 restricts the movement range of the drive rod 216, ensuring that the movement trajectory of the drive rod 216 in the cam groove 2151 is accurate, thereby ensuring that the opening and closing action of the gripper 218 is precise and reliable. In addition, the surface of the limiting plate 2152 is smooth, which can effectively reduce the friction between it and the drive rod 216 and extend the service life of the component.

[0033] The positioning block 219 has a groove in the middle that matches the workpiece being processed, and the outer surface of the groove is provided with anti-slip texture. The shape of the groove of the positioning block 219 is customized according to the external dimensions of different workpieces to ensure that the workpiece can be accurately positioned in the groove.

[0034] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0035] During operation, the servo motor 212 is activated, driving the active bevel gear 213 to rotate. Because the active bevel gear 213 meshes with the driven bevel gear 214, it drives the driven bevel gear 214 and the rotary table 1 to rotate, thus causing the drive rod 216 to rotate. One end of the drive rod 216 is engaged in the cam groove 2151, causing it to move along the trajectory of the cam groove 2151 as it rotates. When the drive rod 216 is located on the protruding side of the cam groove 2151, it causes… The drive rod 216 is pushed to move outward, thereby causing the telescopic block 2181 to move outward. Under the transmission of its connecting rod 2182, the two grippers 218 open outward, thereby releasing the restriction on the workpiece placed in the groove of the positioning block 219. At the same time, driven by the electric push rod 221, the top plate 222 can be moved upward, so that the workpiece processed by the worker can be taken out from the groove of the positioning block 219, and the workpiece to be processed can be put back into the groove of the positioning block 219.

[0036] As the rotary table 1 continues to rotate, the drive rod 216 moves along the groove of the cam groove 2151 under the limit of the cam groove 2151, causing the drive rod 216 to move towards the center of the rotating frame 215, which in turn drives the telescopic block 2181 to move synchronously. That is, under the transmission of the connecting rod 2182, one side of the two grippers 218 moves towards the center synchronously, and then the two grippers 218 clamp the workpiece placed in the groove of the positioning block 219. By controlling the servo motor 212 to occupy the space as needed, the workpiece can be switched to different work positions to adapt to the different processing requirements of the multi-axis CNC machine tool, thereby realizing continuous synchronous processing of multiple work positions.

[0037] 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 process, method, article, or apparatus.

[0038] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-station clamping fixture structure for a multi-axis CNC machine tool, comprising a rotary table (1), characterized in that: The rotary table (1) is provided with a clamping mechanism (2) in the middle, which is used to clamp and fix the workpiece processed by the multi-axis CNC machine tool. The clamping mechanism (2) includes: The rotary clamping assembly (21) includes a driven bevel gear (214) fixedly installed at the bottom of the rotary table (1). A drive assembly is provided on one side of the driven bevel gear (214). A rotating frame (215) is rotatably installed in the middle of the rotary table (1). A cam groove (2151) is provided on the upper part of the rotating frame (215). Several positioning blocks (219) are fixedly installed at the top of the rotary table (1). A fixing block (217) is fixedly installed on one side of the top of each of the positioning blocks (219). The two sides of the fixing blocks (217) are... Each has two symmetrically distributed grippers (218) that are rotatably mounted. A drive rod (216) is slidably inserted through the middle of several fixed blocks (217). One end of each drive rod (216) is slidably locked in the middle of the cam groove (2151). The other end of each drive rod (216) is fixedly mounted with a telescopic block (2181). Both ends of each telescopic block (2181) are movably mounted with a connecting rod (2182). Both ends of each connecting rod (2182) are movably mounted in the middle of one side of the gripper (218). The lifting assembly (22) is located in the middle of the positioning block (219) to facilitate workers in removing the workpiece.

2. The multi-station clamping fixture structure for a multi-axis CNC machine tool according to claim 1, characterized in that: The lifting assembly (22) includes several electric push rods (221) fixedly installed on the upper part of the rotary table (1), and a top plate (222) is slidably attached to the middle of several positioning blocks (219). The bottom middle of the several top plates (222) is fixedly installed on the driving end of the electric push rods (221).

3. The multi-station clamping fixture structure for a multi-axis CNC machine tool according to claim 1, characterized in that: The bottom end of the rotary table (1) is rotatably mounted with a base (211), and the bottom end of the rotating frame (215) is fixedly mounted on the lower surface of the middle part of the base (211).

4. The multi-station clamping fixture structure for a multi-axis CNC machine tool according to claim 3, characterized in that: The drive assembly includes a servo motor (212) fixedly mounted on one side of the upper part of the base (211). The drive end of the servo motor (212) is fixedly mounted with an active bevel gear (213), and the active bevel gear (213) and the driven bevel gear (214) are meshed and connected to each other.

5. The multi-station clamping fixture structure for a multi-axis CNC machine tool according to claim 1, characterized in that: A limiting plate (2152) is fixedly installed at the top center of the rotating frame (215), and one end of the driving rod (216) is in contact with the lower surface of the limiting plate (2152).

6. The multi-station clamping fixture structure for a multi-axis CNC machine tool according to claim 1, characterized in that: The positioning block (219) has a groove in the middle that matches the workpiece being processed, and the outer surface of the groove is provided with anti-slip texture.

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