An automatic tool changer for a CNC machining center

Abstract

This utility model discloses an automatic tool changer for a CNC machining center, belonging to the field of CNC machining centers. The automatic tool changer for a CNC machining center includes a tool holder, with a drive-connected wheel at the output end of the tool holder. Elastic jaws are arranged around the periphery of the wheel, with the inner side of the elastic jaws holding the tool and a conical sleeve inserted into the outer side of the elastic jaws. The conical sleeve can move horizontally and clamps the tool by compressing the elastic jaws with a gradually increasing diameter. Extension plates are fixedly connected to both sides of the tool holder, and a compression arc petal located on one side of the wheel is fixedly connected to the surface of the extension plates. A pressure-relieving arc petal is provided on one side of the compression arc petal. The pressure-relieving arc petal and the compression arc petal are interconnected by an inclined arc transition to form a closed loop. This utility model automatically switches the tool clamping / releasing state by driving the conical sleeve to move in a closed loop track through the rotation of the wheel, without the need for an additional power source.

Description

Technical Field

[0001] This utility model relates to the field of CNC machining center technology, and in particular to an automatic tool changer for CNC machining centers. Background Technology

[0002] A CNC machining center is a high-precision, high-efficiency automated machine tool that uses computer programs to control multiple axes in a coordinated manner to perform complex machining operations such as milling, drilling, tapping, and boring on workpieces made of metal, plastic, and composite materials.

[0003] For example, the patent application number published on the China Patent Network is 201510237043.6, and the patent title is: An automatic tool changer for a machining center. It includes a machining center housing, a cutting tool, a first electric push rod, a first electromagnet, a second electromagnet, a second electric push rod, a lead screw, a lead screw nut, a bearing seat, a second cylinder, a tool outlet, a fourth electromagnet, a coupling, a support plate, a motor, a third electromagnet, and the first cylinder. The motor is installed inside the machining center housing and is connected to the machining center's control system via a wire. The motor is connected to the lead screw via a coupling, and a support plate is installed on the coupling. The fourth electromagnet is installed on the support plate and is connected to the machining center's control system via a wire. The advantage of this invention is that the connection between the cutting tool and the rotating device is less prone to wear.

[0004] However, the existing tool holder structure is relatively simple, mainly relying on independent clips to clamp and fix individual tools. Each independent clip usually requires a corresponding drive element to control its locking and unlocking state, which leads to increased system complexity and higher failure rate. Utility Model Content

[0005] The purpose of this invention is to solve the problem of cumbersome tool fixing methods in the prior art, and to propose an automatic tool changer for CNC machining centers.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An automatic tool changer for a CNC machining center includes a tool holder. A wheel is driven to the output end of the tool holder. Elastic jaws are arranged around the periphery of the wheel. A tool is held inside the elastic jaws, and a conical sleeve is inserted into the outer side of the elastic jaws. The conical sleeve can move horizontally and clamps the elastic jaws by compressing them with a gradually increasing diameter. Extension plates are fixedly connected to both sides of the tool holder. A compression arc petal located on one side of the wheel is fixedly connected to the surface of each extension plate. A pressure-relieving arc petal is provided on one side of the compression arc petal. The pressure-relieving arc petal and the compression arc petal are interconnected by an inclined arc transition to form a closed loop. When the wheel carries the conical sleeve to the side of the compression arc petal, it can use the compression arc petal to compress the conical sleeve for horizontal movement.

[0008] As a preferred technical solution of this application, a vertical plate is fixedly connected to the other side of the wheel, a bracket is fixedly connected to the surface of the vertical plate, a guide rod is fixedly connected to the surface of the conical sleeve, and the side of the guide rod away from the conical sleeve passes through the bracket and is slidably connected to the bracket.

[0009] As a preferred technical solution of this application, a limiting ring is fixedly connected to the surface of the guide rod, and the limiting ring is located on the back of the bracket.

[0010] As a preferred technical solution of this application, a protective cover is fixedly connected to the back of the bracket, and the protective cover extends to the outside of the tool on the side away from the bracket.

[0011] As a preferred technical solution of this application, a reinforcing rib is fixedly connected to one side of the tool holder, and the side of the reinforcing rib away from the tool holder is fixedly connected to the surface of the stress relief arc.

[0012] As a preferred technical solution of this application, a compression spring is provided between the bracket and the conical sleeve, which is sleeved on the surface of the guide rod. The compression spring can provide elastic support for the conical sleeve and release the elastic force when the conical sleeve rotates to one side of the stress relief arc.

[0013] Compared with the prior art, this utility model provides an automatic tool changer for CNC machining centers, which has the following advantages:

[0014] 1. The automatic tool changer of this CNC machining center drives the conical sleeve to move in a closed loop track by rotating a wheel, and can automatically switch the tool clamping / release state without an additional power source.

[0015] 2. The automatic tool changer of this CNC machining center uses a guide rod and a bracket to slide and constrain the tapered sleeve to move only in the horizontal direction, avoiding uneven force on the chuck caused by skewing and improving clamping stability.

[0016] 3. The automatic tool changer of this CNC machining center uses a limit ring to rigidly limit the maximum outward movement of the tapered sleeve, preventing excessive release of the compression spring that could lead to insufficient opening or overload of the elastic jaws.

[0017] 4. The automatic tool changer of this CNC machining center is equipped with a protective cover to prevent cutting chips and coolant from entering the guide rod / compression spring area, thus avoiding impurities from interfering with the movement of the tapered sleeve.

[0018] 5. The automatic tool changer of this CNC machining center strengthens the rigidity of the pressure relief arc by setting reinforcing ribs, which counteracts the impact force on the arc when the compression spring is released, and prevents the arc from deforming or shifting.

[0019] 6. The automatic tool changer of this CNC machining center provides elastic driving force for the outward movement of the tapered sleeve through a compression spring, realizing the instantaneous release of the chuck jaws without the need for external energy input. 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 rear view structure of this utility model;

[0022] Figure 3 This is a partial rear view schematic diagram of the structure of this utility model;

[0023] Figure 4 For the present utility model Figure 1 Enlarged structural diagram at point A in the middle.

[0024] In the diagram: 1. Tool holder; 2. Wheel; 3. Elastic chuck; 4. Tool; 5. Conical sleeve; 6. Extension plate; 7. Extrusion arc; 8. Pressure relief arc; 9. Vertical plate; 10. Bracket; 11. Guide rod; 12. Limiting ring; 13. Protective cover; 14. Reinforcing rib; 15. Compression spring. 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 of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0026] Example 1:

[0027] Reference Figure 1-4An automatic tool changer for a CNC machining center includes a tool holder 1. A wheel 2 is connected to the output end of the tool holder 1. Elastic jaws 3 are arranged around the periphery of the wheel 2. A tool 4 is held inside the elastic jaws 3, and a conical sleeve 5 is inserted into the outer side of the elastic jaws 3. The conical sleeve 5 can move horizontally and clamps the elastic jaws 3 by compressing them with its gradually increasing diameter. Extension plates 6 are fixedly connected to both sides of the tool holder 1. A compression arc 7 located on one side of the wheel 2 is fixedly connected to the surface of the extension plates 6. A pressure relief arc 8 is provided on one side of the compression arc 7. The pressure relief arc 8 and the compression arc 7 are interconnected by an inclined arc transition to form a closed loop. When the wheel 2 carries the conical sleeve 5 to one side of the compression arc 7, it can use the compression arc 7 to compress the conical sleeve 5 for horizontal movement. The rotation of the wheel 2 drives the conical sleeve 5 to move in the closed loop track, requiring no additional power source. The tool 4 can be automatically switched between clamping and releasing states. A vertical plate 9 is fixedly connected to the other side of the wheel 2. A bracket 10 is fixedly connected to the surface of the vertical plate 9. A guide rod 11 is fixedly connected to the surface of the conical sleeve 5. The side of the guide rod 11 away from the conical sleeve 5 passes through the bracket 10 and is slidably connected to the bracket 10. A limit ring 12 is fixedly connected to the surface of the guide rod 11. The limit ring 12 is located on the back of the bracket 10. A protective cover 13 is fixedly connected to the back of the bracket 10. The side of the protective cover 13 away from the bracket 10 extends to the outside of the tool 4. A reinforcing rib 14 is fixedly connected to one side of the tool holder 1. The side of the reinforcing rib 14 away from the tool holder 1 is fixedly connected to the surface of the pressure relief arc 8. A compression spring 15 is provided between the bracket 10 and the conical sleeve 5 and is sleeved on the surface of the guide rod 11. The compression spring 15 can provide elastic support for the conical sleeve 5 and release the elastic force when the conical sleeve 5 rotates to the side of the pressure relief arc 8.

[0028] Specifically, during operation / use of the automatic tool changer of this CNC machining center: the wheel 2 rotates under the drive of the tool holder 1. When the wheel 2, carrying the structure with the conical sleeve 5 inserted on the outside, rotates to the position of the fixedly installed extrusion arc 7, the contour of the extrusion arc 7 will horizontally extrude the conical sleeve 5 inward. As the conical sleeve 5 moves inward, its gradually increasing inner conical surface will strongly extrude the elastic pawl 3 surrounding the wheel 2, forcing the elastic pawl 3 to retract inward, thereby firmly clamping the tool 4 placed inside it. At this time, the compression spring 15 located between the support 10 and the conical sleeve 5 is compressed and stores energy. When it is necessary to change the tool 4, the wheel... The disc 2 continues to rotate, driving the conical sleeve 5 away from the compression arc 7 and along the inclined arc transition section to the position of the pressure relief arc 8. Once in the pressure relief arc 8 area, the constraint of the compression arc 7 is released, and the compressed spring 15 immediately releases its stored elastic force, pushing the conical sleeve 5 to move quickly horizontally outward along the guide rod 11. As the conical sleeve 5 moves outward, the pressure of its inner conical surface on the elastic claw 3 disappears. The elastic claw 3, which was originally forcibly contracted, quickly opens outward due to its own elasticity, automatically releasing the clamped tool 4. Subsequently, the device can be fitted with a new tool 4, and the disc 2 rotates again to the position of the compression arc 7, repeating the above clamping process. The entire process is achieved by the disc 2 rotating to drive the conical sleeve 5 to reciprocate under the control of the fixed arc rim ring, realizing the automatic switching of tool 4 clamping and releasing.

[0029] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. An automatic tool changer of a numerically controlled machining center comprising a tool holder (1), characterized in that, The output end of the tool holder (1) is connected to a wheel (2). The wheel (2) is surrounded by elastic claws (3). The inner side of the elastic claws (3) holds the tool (4). The outer side of the elastic claws (3) is inserted with a conical sleeve (5). The conical sleeve (5) can move horizontally and squeeze the elastic claws (3) with a gradually increasing diameter. Both sides of the tool holder (1) are fixedly connected to extension plates (6). The surface of the extension plates (6) is fixedly connected to a squeezing arc petal (7) located on one side of the wheel (2). A pressure relief arc petal (8) is provided on one side of the squeezing arc petal (7). The pressure relief arc petal (8) and the squeezing arc petal (7) are connected to each other by an inclined arc transition to form a closed loop. When the wheel (2) carries the conical sleeve (5) to the side of the squeezing arc petal (7), it can use the squeezing arc petal (7) to squeeze the conical sleeve (5) for horizontal movement.

2. The automatic tool changer of claim 1, wherein, A vertical plate (9) is fixedly connected to the other side of the wheel (2), a bracket (10) is fixedly connected to the surface of the vertical plate (9), and a guide rod (11) is fixedly connected to the surface of the conical sleeve (5). The guide rod (11) passes through the bracket (10) on the side away from the conical sleeve (5) and is slidably connected to the bracket (10).

3. The automatic tool changer of claim 2, wherein, A limiting ring (12) is fixedly connected to the surface of the guide rod (11), and the limiting ring (12) is located on the back of the bracket (10).

4. The automatic tool changer of claim 2, wherein, A protective cover (13) is fixedly connected to the back of the bracket (10), and the protective cover (13) extends to the outside of the tool (4) on the side away from the bracket (10).

5. The automatic tool changer of claim 1, wherein, A reinforcing rib (14) is fixedly connected to one side of the tool holder (1), and the side of the reinforcing rib (14) away from the tool holder (1) is fixedly connected to the surface of the pressure relief arc (8).

6. The automatic tool changer of claim 3, wherein, A compression spring (15) is provided between the bracket (10) and the conical sleeve (5) and is sleeved on the surface of the guide rod (11). The compression spring (15) can provide elastic support for the conical sleeve (5) and release the elastic force when the conical sleeve (5) rotates to one side of the pressure relief arc (8).

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