Automatic tool changing device for machine tool

Abstract

The utility model relates to the technical field of numerical control lathes, in particular to an automatic tool changer for a machine tool, which comprises a shell, a rotating arm and a driving chassis, a vertically arranged rotating shaft is arranged in the shell, clamping movable pins capable of horizontally stretching and retracting are arranged at two ends of the rotating arm, the rotating arm is rotatably arranged below the shell through the rotating shaft, and the driving chassis is arranged on the rotating arm. The driving chassis is arranged at the bottom of the shell, a driving disc is arranged in the driving chassis, a limiting arc groove sunken inwards is formed in the edge of the driving disc, and the end, close to the rotating shaft, of the clamping movable pin extends into the driving chassis to abut against the edge of the driving disc. According to the automatic tool changing device, the clamping movable pin can achieve clamping and loosening actions without being driven by an external driving part, meanwhile, the clamping action of the clamping movable pin and the rotating action of the rotating arm have high matching precision, needed driving parts are reduced, and the overall structure of the automatic tool changing device is optimized.

Description

Technical Field

[0001] The utility model relates to the technical field of numerical control lathes, and particularly relates to an automatic tool changing device for a machine tool. Background Technique

[0002] A machine tool is a device for processing various parts, mainly cutting the parts with tools, and there are also processes such as casting, forging, welding, stamping, and extrusion. Different tools are required for different process means, and thus the tools need to be frequently replaced.

[0003] According to the Chinese utility model patent with the existing publication number CN215919842U, a tool changing device for a machine tool is described. Its advantages are as follows: The rotating member and the cylinder are used to achieve the purpose of enabling the tool changing main body to rotate and lift. The limiting member is used to enable the tool to enter the sliding groove. The driving mechanism ensures that the clamping ring can extend to achieve the purpose of clamping the tool. Furthermore, the tool locking is ensured through the tool changing mechanism, avoiding the situation that the tool is likely to fall during tool replacement, and thus achieving the purpose of enabling the tool changing main body to replace the tool.

[0004] However, its limiting driving member is composed of a cylinder. The action timing of the telescopic plate needs to cooperate with the driving instruction of the cylinder to complete the tool locking effect, leading to an increase in the number of overall components of the machine tool tool changing device, a larger size, and at the same time, the driving instruction of the cylinder needs to be highly coordinated with the moving position of the tool changing suspension to achieve the tool changing effect of the machine tool. Therefore, in view of these current situations, there is an urgent need to develop an automatic tool changing device for a machine tool to meet the actual use requirements. Content of the Utility Model

[0005] The purpose of the present utility model is to provide an automatic tool changing device for a machine tool, which is used to solve the defects of the existing machine tool tool changing device, such as a large number of components, a large size, and high precision requirements for the driving instructions of the driving member that needs to cooperate with the moving position of the tool changing suspension.

[0006] To solve the above technical problems, the present utility model adopts the following technical solutions:

[0007] The invention discloses an automatic tool changing device for a machine tool, comprising a shell, a rotating arm and a driving chassis. A vertically arranged rotating shaft is arranged inside the shell, and the bottom end of the rotating shaft can extend to the bottom of the shell. The shell is also provided with a driving mechanism, and the driving mechanism is used to drive the rotating shaft to rotate inside the shell. Both ends of the rotating arm are provided with horizontally retractable clamping movable pins. The rotating arm is rotatably arranged below the shell through the rotating shaft. The driving chassis is arranged at the bottom of the shell. The middle part of the rotating arm is rotatably sleeved on the bottom of the driving chassis. The rotating shaft passes through the driving chassis and is fixedly connected with the middle part of the rotating arm. A driving disc is arranged inside the driving chassis, and an inwardly recessed limiting arc groove is arranged on the edge of the driving disc. One end of the clamping movable pin close to the rotating shaft extends to the inside of the driving chassis to contact with the edge of the driving disc.

[0008] In the above description, as a further solution, the centers of the driving chassis and the driving disc are both hollow plug-in holes, and the rotating shaft passes through the driving chassis and the driving disc in sequence through the plug-in holes. A number of fixing columns are provided between the driving chassis and the outer shell, and the fixing columns are vertically arranged between the driving chassis and the outer shell along the periphery of the plug-in holes.

[0009] In the above description, as a further solution, clamping parts are provided at both ends of the rotating arm, and a clamping notch is opened on one side of the clamping part. The clamping notch is an arc-shaped groove, and the end of the clamping movable pin away from the rotating axis can extend outward to the opening of the clamping notch.

[0010] In the above description, as a further solution, a horizontally arranged spring is provided inside the rotating arm, and the spring is sleeved on the middle part of the clamping movable pin.

[0011] In the above description, as a further solution, a rotatable transmission wheel is provided inside the housing, the transmission wheel is used to connect the driving mechanism and the rotating shaft, the side wall of the transmission wheel is provided with a plurality of inwardly recessed travel grooves, and one end face of the transmission wheel is provided with an input gear extending outwardly.

[0012] In the above description, as a further solution, the driving mechanism includes a servo motor, a reducer and an output gear. The output end of the servo motor is transmission-connected to the reducer, the output gear is rotatably arranged at the bottom end of the reducer, and the output gear is meshed with the input gear for transmission.

[0013] In the above description, as a further solution, the input gear is a bevel gear, the input gear is an end face gear, and the inclination angle of the end face gear and the inclination of the side wall of the bevel gear are in a mutually matching structure.

[0014] In the above description, as a further solution, a plurality of rotatable travel cams are provided in the middle of the rotating shaft, and the travel cams are centrally symmetrical along the axis of the rotating shaft, and the plurality of travel cams can cooperate with the travel grooves of the transmission wheel in sequence for transmission.

[0015] The beneficial effects produced by the present utility model are as follows:

[0016] An automatic tool changing device for a machine tool according to the present application is provided with a driving chassis sleeved in the middle of a rotating arm. A driving disc for controlling the movement of a clamping movable pin is provided at the bottom of the driving chassis and is located at the angular position where the rotating arm needs to be clamped. A limiting arc groove recessed inward is provided at the edge of the driving disc. The clamping movable pin can move in contact along the edge of the driving disc, so that the clamping and loosening actions of the clamping movable pin can be realized without being driven by an external driving member. At the same time, the clamping action of the clamping movable pin and the rotating action of the rotating arm have a high matching precision, reducing the required driving components and optimizing the overall structure of the automatic tool changing device. Description of the Drawings

[0017] Figure 1 is a three-dimensional structural schematic diagram of an automatic tool changing device for a machine tool according to the present utility model;

[0018] Figure 2 is a structural exploded schematic diagram of an automatic tool changing device for a machine tool according to the present utility model;

[0019] Figure 3 is a partial perspective structural schematic diagram of the rotating arm according to the present utility model;

[0020] Figure 4 is an internal structural schematic diagram of the rotating arm and the driving chassis according to the present utility model;

[0021] In the figure: 1 - driving mechanism, 11 - servo motor, 12 - reducer, 13 - output gear, 2 - housing, 21 - transmission wheel, 211 - travel groove, 212 - input gear, 22 - fixed column, 3 - rotating shaft, 32 - travel cam, 4 - rotating arm, 41 - clamping movable pin, 42 - spring, 5 - clamping member, 51 - clamping notch, 6 - driving chassis, 61 - insertion through hole, 62 - driving disc, 621 - limiting arc groove. Detailed Embodiments

[0022] For the convenience of understanding by those skilled in the art, the present utility model will be further described below in conjunction with embodiments and the drawings. The content mentioned in the embodiments is not a limitation to the present utility model. The present utility model will be described in detail below with reference to the drawings.

[0023] Please refer to Figures 1-4, an automatic tool changer for a machine tool in its specific implementation, includes a housing 2, a rotating arm 4, and a driving chassis 6. Inside the housing 2, there is a vertically arranged rotating shaft 3, and the bottom end of the rotating shaft 3 can extend to the bottom of the housing 2. The housing 2 is also provided with a driving mechanism 1, which is used to drive the rotating shaft 3 to rotate inside the housing 2. Both ends of the rotating arm 4 are provided with horizontally telescopic clamping pins 41. The rotating arm 4 is rotatably arranged below the housing 2 through the rotating shaft 3. The driving chassis 6 is arranged at the bottom of the housing 2, and the middle part of the rotating arm 4 is rotatably sleeved on the bottom of the driving chassis 6. The rotating shaft 3 passes through the driving chassis 6 and is fixedly connected to the middle part of the rotating arm 4. Inside the driving chassis 6, there is a driving disc 62, and the edge of the driving disc 62 is provided with an inwardly concave limiting arc groove 621. One end of the clamping pin 41 close to the rotating shaft 3 extends into the inside of the driving chassis 6 and abuts against the edge of the driving disc 62.

[0024] The driving chassis 6 is sleeved through the middle part of the rotating arm 4. Among them, the bottom of the driving chassis 6 is provided with a driving disc 62 for controlling the movement of the clamping pin 41, and it is located at the angular position where the rotating arm 4 needs to clamp. The edge of the driving disc 62 of the driving disc 62 is provided with an inwardly concave limiting arc groove 621. The clamping pin 41 can move in a butting manner along the edge of the driving disc 62, so that the clamping pin 41 can realize the clamping and loosening actions without being driven by an external driving part. At the same time, the clamping action of the clamping pin 41 and the rotating action of the rotating arm 4 have a high matching accuracy, reducing the required driving components and optimizing the overall structure of the automatic tool changer.

[0025] Specifically, as Figure 4 and Figure 2 shown, the centers of both the driving chassis 6 and the driving disc 62 are plugging through holes 61 with a hollow structure. The rotating shaft 3 passes through the driving chassis 6 and the driving disc 62 in sequence through the plugging through hole 61. Between the driving chassis 6 and the housing 2, there are several fixing columns 22. The fixing columns 22 are vertically arranged along the circumference of the plugging through hole 61 between the driving chassis 6 and the housing 2. The driving chassis 6 is fixed to the bottom of the housing 2 through the fixing columns 22, so that the limiting arc groove 621 at the edge of the driving disc 62 can be aligned with the position where the clamping pin 41 needs to contract, making the clamping action of the clamping pin 41 and the rotating action of the rotating arm 4 have a high matching accuracy, reducing the required driving components and optimizing the overall structure of the automatic tool changer.

[0026] Specifically, as Figure 3As shown, both ends of the rotating arm 4 are provided with a clamping part 5, and a clamping notch 51 is opened on one side of the clamping part 5, and the clamping notch 51 is an arc-shaped groove. The end of the clamping movable pin 41 away from the rotating shaft 3 can extend outward to the opening of the clamping notch 51. Since the shape of the external processing tool is generally a cylindrical structure, the end of the rotating arm 4 can effectively buckle the external processing tool through the clamping notch 51 with an arc-shaped groove.

[0027] Specific as Figure 3 As shown, a horizontally arranged spring 42 is provided inside the rotating arm 4, and the spring 42 is sleeved on the middle part of the clamping movable pin 41. When the rotating arm 4 rotates to the position of the arc groove, the spring 42 inside the rotating arm 4 provides an inwardly contracting elastic stress to the clamping movable pin 41, thereby contracting the clamping movable pin 41 toward the inside of the arc groove, thereby completing the process of the rotating arm 4 releasing the external processing tool.

[0028] Specific as Figure 2 As shown, a rotatable transmission wheel 21 is provided inside the housing 2, and the transmission wheel 21 is used to connect the driving mechanism 1 and the rotating shaft 3. The side wall of the transmission wheel 21 is provided with a plurality of inwardly recessed travel grooves 211, and one end surface of the transmission wheel 21 is provided with an outwardly extending input gear 212, and the input gear 212 is a bevel gear;

[0029] The driving mechanism 1 includes a servo motor 11, a reducer 12 and an output gear 13. The input gear 212 is an end face gear. The inclination angle of the end face gear and the inclination of the side wall of the bevel gear are in a mutually matching structure. The output end of the servo motor 11 is connected to the reducer 12 in a transmission manner. The output gear 13 is rotatably arranged at the bottom end of the reducer 12. The output gear 13 is meshed with the input gear 212 for transmission. The reducer 12 can reduce the output speed of the servo motor 11 and increase the torque of the output gear 13.

[0030] A plurality of rotatable travel cams 32 are provided in the middle of the rotating shaft 3 . The travel cams 32 are centrally symmetrical along the axis of the rotating shaft 3 . The plurality of travel cams 32 can sequentially cooperate with the travel grooves 211 of the transmission wheel 21 for transmission.

[0031] Working process of an automatic tool changing device for machine tools:

[0032] First, the servo motor 11 drives the output gear 13 to rotate through the reducer 12, driving the input gear 212 and the transmission wheel 21 to rotate. At the same time, the rotation shaft 3 can cooperate with the travel groove 211 of the transmission wheel 21 through the travel cam 32, converting the horizontal rotation of the transmission wheel 21 into the radial direction of the rotation shaft 3, and the direction of the rotation shaft 3 changes;

[0033] Then, the rotating shaft 3 drives the rotating arm 4 at the bottom to rotate. The driving chassis 6 is fixed to the bottom of the housing 2 through the fixing column 22, so that the limiting arc groove 621 on the edge of the driving disc 62 can be aligned with the position where the clamping movable pin 41 needs to contract. When the rotating arm 4 rotates to the position where the clamping movable pin 41 needs to contract, an elastic stress for inward contraction is provided to the clamping movable pin 41 through the spring 42 inside the rotating arm 4, and the clamping movable pin 41 is contracted into the arc groove, completing the process of the rotating arm 4 releasing the external processing tool.

[0034] When the rotating arm 4 rotates to the position where the clamping movable pin 41 needs to clamp, the clamping movable pin 41 disengages from the arc groove and protrudes outward along the edge of the driving disc 62, so that the end of the clamping movable pin 41 away from the rotating shaft 3 can extend outward to the opening of the clamping notch 51 to effectively clamp the external processing tool.

[0035] Among them, the clamping action of the clamping movable pin 41 and the rotating action of the rotating arm 4 have a high matching accuracy, reducing the required driving components and optimizing the overall structure of the automatic tool changer.

[0036] The above is only a preferred embodiment of the present invention and does not impose any form of limitation on the present invention. Although the present invention is disclosed above in a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art, without departing from the scope of the technical solution of the present invention, when making some changes or modifications using the disclosed technical content as equivalent change equivalent embodiments, but as long as it does not depart from the content of the technical solution of the present invention, any simple modification, equivalent change and modification made to the above embodiments according to the technical meaning of the present invention shall fall within the scope of the technical solution of the present invention.

Claims

1. An automatic tool changing device for a machine tool, characterized in that: include: A housing, wherein a vertically arranged rotating shaft is disposed inside the housing, and the bottom end of the rotating shaft can extend to the bottom of the housing. The housing is also provided with a driving mechanism, and the driving mechanism is used to drive the rotating shaft to rotate inside the housing; A rotating arm, both ends of which are provided with horizontally retractable clamping movable pins, and the rotating arm is rotatably arranged below the housing through a rotating shaft; The driving chassis is arranged at the bottom of the shell, the middle part of the rotating arm is rotatably sleeved on the bottom of the driving chassis, the rotating shaft passes through the driving chassis and is fixedly connected with the middle part of the rotating arm, a driving disc is arranged inside the driving chassis, and an inwardly recessed limiting arc groove is arranged on the edge of the driving disc, and the end of the clamping movable pin close to the rotating shaft extends to the inside of the driving chassis and contacts with the edge of the driving disc.

2. The automatic tool changing device for a machine tool according to claim 1, characterized in that: The centers of the driving chassis and the driving disc are both hollow plug-in holes, and the rotating shaft passes through the driving chassis and the driving disc in sequence through the plug-in holes. A plurality of fixing columns are provided between the driving chassis and the outer shell, and the fixing columns are vertically arranged between the driving chassis and the outer shell along the periphery of the plug-in holes.

3. The automatic tool changing device for a machine tool according to claim 1, characterized in that: Both ends of the rotating arm are provided with clamping pieces, one side of the clamping piece is provided with a clamping notch, the clamping notch is an arc-shaped groove, and the end of the clamping movable pin away from the rotating shaft can extend outward to the opening of the clamping notch.

4. The automatic tool changing device for a machine tool according to claim 1, characterized in that: A horizontally arranged spring is arranged inside the rotating arm, and the spring is sleeved on the middle part of the clamping movable pin.

5. An automatic tool changing device for a machine tool according to any one of claims 1 to 4, characterized in that: A rotatable transmission wheel is arranged inside the shell, and the transmission wheel is used to connect the driving mechanism and the rotating shaft. The side wall of the transmission wheel is provided with a plurality of inwardly recessed travel grooves, and one end surface of the transmission wheel is provided with an input gear extending outwardly.

6. The automatic tool changing device for a machine tool according to claim 5, characterized in that: The driving mechanism includes a servo motor, a reducer and an output gear. The output end of the servo motor is transmission-connected with the reducer. The output gear is rotatably arranged at the bottom end of the reducer. The output gear is meshed with the input gear for transmission.

7. The automatic tool changing device for a machine tool according to claim 6, characterized in that: The input gear is a bevel gear, and the input gear is an end face gear. The inclination angle of the end face gear and the inclination of the side wall of the bevel gear are in a mutually matching structure.

8. The automatic tool changing device for a machine tool according to claim 5, characterized in that: A plurality of rotatable travel cams are arranged in the middle of the rotating shaft. The travel cams are centrally symmetrical along the axis of the rotating shaft. The plurality of travel cams can be sequentially matched with the travel grooves of the transmission wheel for transmission.

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