Tool changing mechanism of CNC (computer numerical control) machine tool

Abstract

The tool changing mechanism of the CNC machine tool comprises a tool changing frame and a transmission device, the tool changing frame can rotate and ascend and descend, the tool changing frame is provided with an included angle, a tool is installed on the transmission device, a tool bin used for containing the tool is installed on one side of the tool changing frame, a chain is installed in the tool bin, and the chain is connected with the tool changing frame. The cutter is fixed in the storage frame on the chain, meanwhile, the plane of the chain and the plane where the cutter changing frame, the transmission device and the cutter bin are connected are located on the same plane, the cutter can be directly taken out from the interior of the cutter bin when the chain rotates, the cutter does not need to be controlled to rotate in the cutter bin, the mechanical complexity of an existing cutter bin is reduced, and the machining efficiency is improved. When the cutter is stored, the cutter can extrude the round corner at the end of the positioning rod, the positioning rod is driven to slide in the sliding hole, the replaced cutter can be fixed to the storage rack, then the position of the cutter is limited by the round corner at the end of the positioning rod, and the cutter is prevented from falling off from the storage rack.

Description

Technical Field

[0001] The utility model relates to the technical field of CNC numerical control machining, in particular to a tool changing mechanism of a CNC machine tool. Background Technique

[0002] A CNC machine tool is an automated machine tool equipped with a program control system. This control system can logically process a program with control codes or other symbolic instructions, decode it, represent it in coded numbers, and input it into the numerical control device through an information carrier. After arithmetic processing, various control signals are sent out by the numerical control device to control the actions of the machine tool, and the parts are automatically processed according to the shape and size required by the drawing. The tool changing mechanism on the CNC machine tool includes a tool magazine and a tool changer, which are used to realize automatic tool changing.

[0003] Most of the tool magazines in the existing tool changing mechanisms contain several tools, and the positions of the tools are variable. The positions of the tools can be changed, and the tools can be replaced by the rotation and lifting of the tool changer. However, the angles of the tools in the existing tool magazine are arranged parallel to the tool changer. After selecting the tool to be used, the angle of the tool still needs to be adjusted by the tool flipping mechanism installed in the tool magazine, and the internal devices of the tool magazine are relatively cumbersome. Content of the Utility Model

[0004] The purpose of the utility model is to provide a tool changing mechanism of a CNC machine tool to solve the problems put forward in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A tool changing mechanism of a CNC machine tool includes a tool changer and a transmission device. The tool changer can rotate and lift, and the tool changer has an included angle. A tool is installed on the transmission device. A tool magazine for storing tools is installed on one side of the tool changer. A chain is installed inside the tool magazine. Receiving frames are fixedly installed on the chain at equal intervals. A receiving groove is opened at the bottom end of the receiving frame, and the tool is received inside the receiving groove. The plane of the chain is in the same plane as the plane connected by the tool changer, the transmission device and the tool magazine. An opening is opened at the bottom end of the tool magazine, and a mounting frame is fixedly installed on one side of the tool magazine.

[0006] As a further preferred of this technical solution, a rotating shaft is symmetrically and rotatably installed at the middle parts of both ends of the tool magazine through bearings. A sprocket is fixedly installed at one end of the rotating shaft. The chain is in transmission connection between the two sprockets. A servo motor is fixedly installed on one side of the tool magazine corresponding to the position of one of the rotating shafts. The output end of the servo motor is fixedly connected to the rotating shaft.

[0007] As a further preferred of this technical solution, guide blocks are symmetrically arranged at the bottom end of the receiving frame corresponding to the position of the receiving groove.

[0008] As a further preference of this technical solution, sliding holes are symmetrically formed at the bottom end of the storage rack. A positioning rod is slidably installed inside the sliding holes. A rounded corner is formed at one end of the positioning rod. A return spring is sleeved outside the end of the positioning rod away from the rounded corner. One end of the return spring is fixedly connected to the storage rack, and the other end of the return spring is fixedly connected to the end of the positioning rod away from the rounded corner.

[0009] As a further preference of this technical solution, the position of the rounded corner does not exceed the end of the guide block.

[0010] As a further preference of this technical solution, a fixing plate is fixedly installed on the side of the tool magazine away from the servo motor. The fixing plate is made of transparent glass.

[0011] The utility model provides a tool changing mechanism for a CNC machine tool, which has the following beneficial effects:

[0012] (1) In the utility model, the tool is fixed inside the storage rack on the chain, and at the same time, the plane of the chain is in the same plane as the planes connected to the tool changing rack, the transmission device and the tool magazine. When the chain is rotated, the tool can be directly taken out from the tool magazine without controlling the rotation of the tool inside the tool magazine, reducing the mechanical complexity of the existing tool magazine.

[0013] (2) When the tool is stored in the utility model, the tool can squeeze the rounded corner at the end of the positioning rod, driving the positioning rod to slide inside the sliding hole. The replaced tool can be fixed on the storage rack, and then the position of the tool is restricted by the rounded corner at the end of the positioning rod, preventing the tool from falling off the storage rack. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is the overall structural schematic diagram of the utility model;

[0015] Figure 2 is the partial exploded structural schematic diagram of the utility model;

[0016] Figure 3 is the structural schematic diagram of the tool magazine of the utility model;

[0017] Figure 4 is Figure 3 the enlarged view of part A in

[0018] In the figure: 1, tool changing rack; 2, transmission device; 3, tool magazine; 4, chain; 5, storage rack; 6, storage groove; 7, opening; 8, mounting rack; 9, rotating shaft; 10, sprocket; 11, servo motor; 12, guide block; 13, sliding hole; 14, positioning rod; 15, rounded corner; 16, return spring; 17, fixing plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] Next, in combination with the accompanying drawings in the embodiments of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described.

[0020] The present utility model provides a technical solution: As Figures 1 to 4 shown, in this embodiment, a tool changing mechanism of a CNC machine tool includes a tool changing rack 1 and a transmission device 2. The tool changing rack 1 can rotate and lift. The tool changing rack 1 has an included angle. The rotation and lifting methods of the tool changing rack 1 are the same as the working principle of the existing tool changing rack 1, and can fix and store the tools. The transmission device 2 is installed with tools and is used for operations such as cutting of workpieces. A tool magazine 3 for storing tools is installed on one side of the tool changing rack 1. A chain 4 is installed inside the tool magazine 3. Receiving racks 5 are fixedly installed at equal intervals on the chain 4. A receiving groove 6 is opened at the bottom end of the receiving rack 5, and the tools are stored inside the receiving groove 6. The plane of the chain 4 is in the same plane as the plane connected by the tool changing rack 1, the transmission device 2, and the tool magazine 3. An opening 7 is opened at the bottom end of the tool magazine 3. An installation rack 8 is fixedly installed on one side of the tool magazine 3. By fixing the tools inside the receiving rack 5 on the chain 4 and making the plane of the chain 4 in the same plane as the plane connected by the tool changing rack 1, the transmission device 2, and the tool magazine 3, the tools can be directly taken out from the inside of the tool magazine 3 when the chain 4 is rotated, without having to control the rotation of the tools inside the tool magazine 3, reducing the mechanical complexity of the existing tool magazine 3.

[0021] As Figures 1 to 4 shown, at the middle parts of both ends of the tool magazine 3, rotating shafts 9 are symmetrically installed through bearings. A sprocket 10 is fixedly installed at one end of the rotating shaft 9. The chain 4 is in transmission connection between the two sprockets 10. A servo motor 11 is fixedly installed on one side of the tool magazine 3 corresponding to the position of one of the rotating shafts 9. The output end of the servo motor 11 is fixedly connected to the rotating shaft 9.

[0022] By driving one of the sprockets 10 to rotate through the servo motor 11, the rotation of the chain 4 will be driven through the transmission between the chain 4 and the two sprockets 10, and the tool on the chain 4 at the specified position can be moved to the opening 7 at the bottom end of the tool magazine 3.

[0023] As Figures 1 to 4 shown, guide blocks 12 are symmetrically arranged at the positions of the receiving rack 5 corresponding to the receiving groove 6 at the bottom end.

[0024] The guide blocks 12 can limit the grooves opened on the tools to prevent the tools from falling off.

[0025] As Figures 1 to 4As shown, sliding holes 13 are symmetrically formed at the bottom end of the storage rack 5. A positioning rod 14 is slidably installed inside the sliding holes 13. A rounded corner 15 is formed at one end of the positioning rod 14. A return spring 16 is sleeved outside the end of the positioning rod 14 away from the rounded corner 15. One end of the return spring 16 is fixedly connected to the storage rack 5, and the other end of the return spring 16 is fixedly connected to the end of the positioning rod 14 away from the rounded corner 15.

[0026] When storing the tool, the rounded corner 15 at the end of the positioning rod 14 can be squeezed by the tool, which will drive the positioning rod 14 to slide inside the sliding hole 13. The replaced tool can be fixed on the storage rack 5, and then the position of the tool will be restricted by the rounded corner 15 at the end of the positioning rod 14 to prevent the tool from falling off the storage rack 5.

[0027] As Figures 1 to 4 shown, the position of the rounded corner 15 does not exceed the end of the guide block 12.

[0028] Prevent the tool from moving into the storage rack 5 due to interference from the positioning rod 14 when installing the tool.

[0029] As Figures 1 to 4 shown, a fixing plate 17 is fixedly installed on the side of the tool magazine 3 away from the servo motor 11. The fixing plate 17 is made of transparent glass material.

[0030] It is convenient to observe the positions and states of the various tools inside the tool magazine 3.

[0031] The present utility model provides a tool changing mechanism for a CNC machine tool. The specific working principle is as follows:

[0032] When the device is in use, one of the sprockets 10 is driven to rotate by the servo motor 11. The rotation of the chain 4 is driven by the transmission between the chain 4 and the two sprockets 10. The tool on the chain 4 at the specified position can be moved to the opening 7 at the bottom end of the tool magazine 3. Rotate the tool changing rack 1, and rotate one end of the tool changing rack 1 to the position corresponding to the tool on the storage rack 5 at the bottom of the tool magazine 3. Control the rotation of the tool changing rack 1. The tool changing rack 1 will clamp the tool on the storage rack 5, and control the tool on the storage rack 5 to be removed from the storage rack 5. Then slightly rotate the tool changing rack 1, and rotate the other end of the tool changing rack 1 to the outside of the tool installed on the transmission device 2. Subsequently, control the tool changing rack 1 to descend to remove the tool installed on the transmission device 2. Then rotate the tool changing rack 1 to rotate the tool to be replaced to below the transmission device 2. Then control the tool changing rack 1 to rise to install the tool to be installed on the transmission device 2. Then control the tool changing rack 1 to descend, operate the transmission device 2 to move to the processing position. Then control the tool changing rack 1 to descend and rotate, and send the replaced tool to one side on the storage rack 5, which will drive the replaced tool to squeeze the rounded corner 15 at the end of the positioning rod 14, and drive the positioning rod 14 to slide inside the sliding hole 13, and the replaced tool can be fixed on the storage rack 5.

[0033] Although embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A tool changing mechanism for a CNC machine tool, characterized in that: The invention comprises a tool changing frame (1) and a transmission device (2), wherein the tool changing frame (1) can rotate and rise and fall, the tool changing frame (1) has an included angle, a tool is mounted on the transmission device (2), a tool magazine (3) for storing the tool is mounted on one side of the tool changing frame (1), a chain (4) is mounted inside the tool magazine (3), a storage frame (5) is fixedly mounted on the chain (4) at equal intervals, a storage groove (6) is provided at the bottom end of the storage frame (5), and the tool is stored inside the storage groove (6), the plane of the chain (4) is in the same plane as the plane connected to the tool changing frame (1), the transmission device (2) and the tool magazine (3), an opening (7) is provided at the bottom end of the tool magazine (3), and a mounting frame (8) is fixedly mounted on one side of the tool magazine (3).

2. The tool changing mechanism of a CNC machine tool according to claim 1, characterized in that: A rotating shaft (9) is symmetrically rotatably mounted at the middle of both ends of the knife magazine (3) via bearings, a sprocket (10) is fixedly mounted at one end of the rotating shaft (9), and the two sprockets (10) are transmission-connected to a chain (4), and a servo motor (11) is fixedly mounted at a position corresponding to one of the rotating shafts (9) on one side of the knife magazine (3), and an output end of the servo motor (11) is fixedly connected to the rotating shaft (9).

3. The tool changing mechanism of a CNC machine tool according to claim 1, characterized in that: A guide block (12) is symmetrically arranged at the bottom end of the storage rack (5) corresponding to the position of the storage slot (6).

4. The tool changing mechanism of a CNC machine tool according to claim 3, characterized in that: The bottom end of the storage rack (5) is symmetrically provided with sliding holes (13), a positioning rod (14) is slidably installed inside the sliding hole (13), one end of the positioning rod (14) is provided with a rounded corner (15), a return spring (16) is sleeved on the outer side of the end of the positioning rod (14) away from the rounded corner (15), one end of the return spring (16) is fixedly connected to the storage rack (5), and the other end of the return spring (16) is fixedly connected to the end of the positioning rod (14) away from the rounded corner (15).

5. The tool changing mechanism of a CNC machine tool according to claim 4, characterized in that: The position of the rounded corner (15) does not exceed the end of the guide block (12).

6. The tool changing mechanism of a CNC machine tool according to claim 2, characterized in that: A fixing plate (17) is fixedly mounted on the side of the knife magazine (3) away from the servo motor (11), and the fixing plate (17) is made of transparent glass.

Images