Automatic tool changing mechanism for numerical control machine tool

Abstract

The utility model relates to the technical field of machine tools, in particular to an automatic tool changing mechanism for a numerical control machine tool, which comprises a machine table, a feeding rotary table is rotatably mounted on the machine table, four tools are arranged on the feeding rotary table, and a feeding mechanism for driving the feeding rotary table to convey the tools in a circumferential stepping manner is arranged on the machine table. A driving air cylinder is fixedly installed on the machine table, and a movable frame fixedly connected with the output end of the driving air cylinder is movably arranged on the machine table. The cutter and the mounting frame are correspondingly arranged, the cutter comprises a threaded rod, a middle column and an alloy cutter head, and the mounting frame comprises a driving rotating shaft, a threaded pipe and an outer cover. A feeding rotary table capable of rotating in a circumferential stepping mode is arranged on the machine table through a traction rotary table and a notch astronomical disc. The moving frame is arranged on the machine body, and the driving gear column and the driving rotating shaft which are in transmission connection are arranged on the lifting support of the moving frame, so that the driving rotating shaft drives the mounting frame to spirally ascend and descend, and butt joint and connection assembly of the mounting frame and the cutter are achieved.

Description

Technical Field

[0001] This utility model relates to the field of machine tool technology, and in particular to an automatic tool changing mechanism for CNC machine tools. Background Technology

[0002] Numerical control machine tools are automated machine tools equipped with a program control system.

[0003] As the structure that directly contacts the workpiece during daily operation of CNC machine tools, cutting tools are prone to structural wear and failure, thus requiring regular inspection, maintenance, and replacement. However, traditional manual replacement methods often involve unscrewing numerous screws to disassemble and reassemble the cutting tools, which is not only time-consuming and labor-intensive but also prone to installation errors. Although existing tool changing methods employ CNC machine tool changing mechanisms such as those disclosed in CN221676538U, where the tool magazine includes a base fixed to the CNC machine tool bed with multiple tool holders arranged in multiple rows, the individual tools in the tool magazine are concentrated in one location, making it difficult to flexibly adjust their alignment with the mounting base. Furthermore, the spatial arrangement during assembly can easily reduce operational efficiency, especially when inspecting and maintaining a large number of tools, as the difficulty in fixing the tools in designated positions severely impacts the efficiency and overall work performance of tool inspection and maintenance. Utility Model Content

[0004] The purpose of this invention is to solve the problem of automatic tool changing in existing CNC machine tools, and to propose an automatic tool changing mechanism for CNC machine tools.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An automatic tool changer for a CNC machine tool includes a machine base, a feeding turntable rotatably mounted on the machine base, four tools being arranged on the feeding turntable, a feeding mechanism for driving the feeding turntable to circumferentially step-feed the tools, a drive cylinder fixedly mounted on the machine base, and a movable frame movably mounted on the machine base and fixedly connected to the output end of the drive cylinder, a mounting bracket corresponding to the tool being movably mounted on the movable frame, and a connecting mechanism for fixing the mounting bracket and the tool being fixedly connected on the movable frame.

[0007] Preferably, the cutting tool includes a threaded rod, the lower end of which is integrally connected to a central column, the lower end of which is fixedly connected to an alloy cutting head, a limiting annular groove is formed in the middle of the central column, and a limiting clamping plate is integrally connected to the lower end of the central column.

[0008] Preferably, the feeding mechanism includes a first motor fixedly mounted on the machine base and used to move and pull the feeding turntable to rotate in a circumferential stepping manner. The feeding turntable has four circumferentially equidistantly distributed placement points for vertically placing the cutting tools.

[0009] Preferably, a traction turntable is fixedly connected to the output end of the first motor, a slotted star disk is fixedly connected to the lower end of the feeding turntable, and a traction bolt corresponding to the slot of the slotted star disk is integrally connected to the traction turntable.

[0010] Preferably, the placement point includes a countersunk hole formed in the feeding turntable, and the countersunk hole has a limiting notch corresponding to the limiting plate.

[0011] Preferably, the mounting bracket includes a drive shaft movably fitted into a movable frame, a threaded tube integrally connected to the drive shaft with a corresponding threaded rod, an outer cover integrally connected to the threaded tube, a sealed elongated cavity communicating with the threaded tube in the outer cover, a drive piston extending into the threaded tube slidably fitted into the middle opening of the sealed elongated cavity, and a grinding disc rotatably connected to the drive piston to abut the threaded rod, and driven piston bolts corresponding to limiting annular grooves slidably fitted into the openings on both sides of the sealed elongated cavity.

[0012] Preferably, the connecting mechanism includes a lifting bracket slidably mounted on a movable frame and used for rotatably mounting a drive shaft. A second motor is fixedly mounted on the movable frame, and a ball screw driven by the second motor is rotatably mounted on the movable frame. A movable nut is provided on the ball screw, and a guide rod that movably passes through the movable frame and is fixedly connected to the lifting bracket is fixedly connected to the movable nut. A drive gear column is keyed to the ball screw, and a driven gear that meshes with the drive gear column is keyed to the drive shaft.

[0013] Preferably, the thickness of the drive gear post is three times the thickness of the driven gear.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] 1. This utility model provides a corresponding cutting tool and mounting bracket. The cutting tool includes a threaded rod, a central column, and an alloy cutting head. The mounting bracket includes a drive shaft, a threaded tube, and an outer cover. A corresponding drive piston and driven piston are installed in a sealed long cavity to facilitate a double connection and assembly between the two.

[0016] 2. This utility model utilizes a traction turntable and a slotted star disk on the machine base to set up a feeding turntable that can rotate in a circumferential stepping manner, so that four circumferentially equidistantly distributed cutters can perform stepping movements, so as to facilitate the adjustment of the cutter position according to the need for cutter changing.

[0017] 3. This utility model has a movable frame on the machine body, and a drive gear column and a drive shaft with transmission connection are set on the lifting bracket of the movable frame, so that the drive shaft drives the mounting frame to lift and lower in a spiral manner, realizing the docking and connection assembly of the mounting frame and the tool. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of an automatic tool changing mechanism for CNC machine tools proposed in this utility model;

[0019] Figure 2 This is a bottom view of an automatic tool changer for a CNC machine tool proposed in this utility model;

[0020] Figure 3 This is a cross-sectional view of an automatic tool changing mechanism for a CNC machine tool proposed in this utility model;

[0021] Figure 4 This is a schematic diagram of the tool structure of an automatic tool changing mechanism for CNC machine tools proposed in this utility model;

[0022] Figure 5 This is a sectional view of the mounting bracket for an automatic tool changer mechanism for a CNC machine tool, as proposed in this utility model.

[0023] In the diagram: 1. Machine base; 2. Feeding turntable; 3. Cutting tool; 31. Threaded rod; 32. Central column; 33. Alloy cutter head; 34. Limiting ring groove; 35. Limiting clamping plate; 4. Feeding mechanism; 41. First motor; 42. Traction turntable; 43. Groove star disk; 44. Placement point; 441. Countersunk hole; 442. Limiting notch; 5. Drive cylinder; 6. Moving frame; 7. Mounting frame; 71. Drive shaft; 72. Threaded pipe; 73. Outer cover; 74. Sealed long cavity; 75. Drive piston; 76. Driven piston bolt; 77. Grinding disc; 8. Connecting mechanism; 81. Lifting bracket; 82. Second motor; 83. Ball screw; 84. Moving nut; 85. Guide rod; 86. Drive gear column; 87. Driven gear. 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 of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0025] Reference Figures 1-5An automatic tool changer for a CNC machine tool includes a machine base 1, on which a feeding turntable 2 is rotatably mounted. Four tools 3 are mounted on the feeding turntable 2, equidistantly distributed circumferentially. By driving the feeding turntable 2 to perform a step-by-step rotational motion, the tools 3 to be installed can be aligned with a mounting bracket 7. Each tool 3 includes a threaded rod 31, with a central column 32 integrally connected to its lower end. An alloy cutting head 33 is fixedly connected to the lower end of the central column 32. A limiting annular groove 34 is formed in the middle of the central column 32, and a limiting clamping plate 35 is integrally connected to its lower end. It should be noted that the alloy cutting heads 33 of the four tools 3 may be of different ages or shapes to facilitate selective installation and use of the four tools 3.

[0026] The machine base 1 is equipped with a feeding mechanism 4 for driving the feeding turntable 2 to circumferentially step-feed the cutting tool 3. The feeding mechanism 4 includes a first motor 41 fixedly mounted on the machine base 1 and used to flexibly pull the feeding turntable 2 to rotate circumferentially in a step-feeding manner. The feeding turntable 2 has four circumferentially equidistantly distributed placement points 44 for vertically placing the cutting tool 3. By driving the feeding turntable 2 to rotate in a step-feeding manner, the feeding turntable 2 can place the cutting tool 3 onto the mounting bracket 7 each time it deflects by 90°. The placement point 44 includes a countersunk hole 441 opened in the feeding turntable 2. The countersunk hole 441 has a limiting notch 442 corresponding to the limiting plate 35. It should be noted that by snapping the limiting plate 35 in the cutting tool 3 into the limiting notch 442, the cutting tool 3 can be limited by the placement point 44, ensuring that the mounting bracket 7 can be threadedly connected to the cutting tool 3.

[0027] A drive cylinder 5 is fixedly installed on the machine base 1, and a movable frame 6 is movably installed on the machine base 1 and fixedly connected to the output end of the drive cylinder 5. The movable frame 6 is driven to move horizontally so as to realize the position correspondence between the mounting frame 7 and the tool 3.

[0028] A mounting bracket 7 corresponding to the tool 3 is movably mounted on the movable frame 6. The mounting bracket 7 includes a drive shaft 71 movably fitted into the movable frame 6. A threaded tube 72 corresponding to the threaded rod 31 is integrally connected to the drive shaft 71. An outer cover 73 is integrally connected to the threaded tube 72. By setting concentrically distributed threaded tubes 72 and outer covers 73, the tool 3 can be double-mounted. A sealed elongated cavity 74 communicating with the threaded tube 72 is opened in the outer cover 73. An extension extending to the middle opening of the sealed elongated cavity 74 is slidably fitted. The drive piston 75 is located inside the threaded tube 72, and a grinding disc 77 that rotatably abuts against the threaded rod 31 is rotatably connected to the drive piston 75. The driven piston plugs 76 corresponding to the limiting ring grooves 34 are slidably fitted in the openings on both sides of the sealed long cavity 74. During the process of threading the threaded tube 72 and the threaded rod 31, the drive piston 75 is squeezed, causing the driven piston plugs 76 to extend out of the sealed long cavity 74 until the driven piston plugs 76 are snapped into the limiting ring grooves 34 in the tool 3.

[0029] The movable frame 6 is provided with a connecting mechanism 8 for fixing the mounting bracket 7 and the tool 3. The connecting mechanism 8 includes a lifting bracket 81 that is slidably mounted on the movable frame 6 and used to rotatably mount the drive shaft 71. A second motor 82 is fixedly mounted on the movable frame 6. A ball screw 83 driven by the second motor 82 is rotatably mounted on the movable frame 6. A movable nut 84 is provided on the ball screw 83. A guide rod 85 that movably passes through the movable frame 6 and is fixedly connected to the lifting bracket 81 is fixedly connected to the movable nut 84. A drive gear column 86 is keyed to the ball screw 83, and a driven gear 87 that meshes with the drive gear column 86 is keyed to the drive shaft 71. Under the driving action of the ball screw 83, the lifting bracket 81 of the mounting bracket 7 is vertically raised and lowered, and at the same time, the drive shaft 71 is rotated, so that the threaded tube 72 drives the outer cover 73 to move down in a spiral motion until the threaded tube 72 and the threaded rod 31 are completely threadedly connected.

[0030] The output end of the first motor 41 is fixedly connected to the traction turntable 42, and the lower end of the feeding turntable 2 is fixedly connected to the slotted star disk 43. The traction turntable 42 is integrally connected with the traction bolts corresponding to the slots in the slotted star disk 43. The slotted star disk 43 has four slots for moving and fitting the traction bolts, so that the feeding turntable 2 can be driven to deflect 90° each time the two are connected. Under the driving action of the first motor 41, the feeding turntable 2 performs a step-by-step rotation, so that after each 90° rotation, the tool to be installed 3 can be aligned with the mounting bracket 7.

[0031] The thickness of the drive gear column 86 is three times the thickness of the driven gear 87, so that the mounting bracket 7 is always driven by the ball screw 83 during the lifting process.

[0032] It should be noted that the specific models and specifications of the first motor 41, the second motor 82, and the drive cylinder 5 need to be selected and determined according to the actual specifications of the device. The specific selection and calculation methods adopt existing technologies in this field, so they will not be elaborated here.

[0033] The functional principle of this utility model can be explained through the following operation methods:

[0034] The first motor 41 is turned on, and the traction turntable 42 and the slot star disk 43 drive the feeding turntable 2 to deflect 90° each time, so that the tool 3 to be installed corresponds to the mounting bracket 7.

[0035] The control drive cylinder 5 is opened, so that the moving frame 6 drives the mounting frame 7 to move to the position directly above the tool 3 via the lifting bracket 81;

[0036] The second motor 82 is turned on, causing the ball screw 83 to rotate. The moving nut 84 drives the lifting bracket 81 to move vertically downward through the guide rod 85. At the same time, the ball screw 83 drives the drive shaft 71 to rotate through the drive gear column 86 and the driven gear 87.

[0037] The drive shaft 71 drives the threaded tube 72 and the outer cover 73 to move downwards in a spiral motion, so that the threaded tube 72 is threadedly connected to the threaded rod 31. The threaded rod 31 applies pressure to the grinding disc 77, causing the drive piston 75 to retract into the sealed long cavity 74, so that the driven piston 76 is snapped into the limiting ring groove 34.

[0038] 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 for a CNC machine tool, comprising a machine base (1), characterized in that, The machine base (1) is rotatably mounted with a feeding turntable (2), and four cutting tools (3) are provided on the feeding turntable (2). The machine base (1) is provided with a feeding mechanism (4) for driving the feeding turntable (2) to circumferentially step-feed the cutting tools (3). The machine base (1) is fixedly mounted with a driving cylinder (5), and the machine base (1) is movably mounted with a movable frame (6) fixedly connected to the output end of the driving cylinder (5). The movable frame (6) is movably mounted with a mounting frame (7) corresponding to the cutting tool (3), and the movable frame (6) is provided with a connecting mechanism (8) for fixing the mounting frame (7) and the cutting tool (3).

2. The automatic tool changer for a CNC machine tool according to claim 1, characterized in that, The cutting tool (3) includes a threaded rod (31), the lower end of which is integrally connected to a central column (32), the lower end of which is fixedly connected to an alloy cutting head (33), a limiting ring groove (34) is formed in the middle of the central column (32), and a limiting plate (35) is integrally connected to the lower end of the central column (32).

3. An automatic tool changer for a CNC machine tool according to claim 1, characterized in that, The feeding mechanism (4) includes a first motor (41) fixedly mounted on the machine base (1) and used to move the feeding turntable (2) to rotate in a circumferential stepping manner. The feeding turntable (2) has four circumferentially equidistantly distributed placement points (44) for vertically placing the cutting tool (3).

4. An automatic tool changer for a CNC machine tool according to claim 3, characterized in that, The output end of the first motor (41) is fixedly connected to a traction turntable (42), the lower end of the feeding turntable (2) is fixedly connected to a slotted star disk (43), and the traction turntable (42) is integrally connected to a traction bolt corresponding to the slot in the slotted star disk (43).

5. An automatic tool changer for a CNC machine tool according to claim 3, characterized in that, The placement point (44) includes a countersunk hole (441) opened in the feeding turntable (2), and a limiting notch (442) corresponding to the limiting plate (35) is opened in the countersunk hole (441).

6. An automatic tool changer for a CNC machine tool according to claim 1, characterized in that, The mounting bracket (7) includes a drive shaft (71) movably fitted in the movable bracket (6). A threaded tube (72) corresponding to the threaded rod (31) is integrally connected to the drive shaft (71). An outer cover (73) is integrally connected to the threaded tube (72). A sealed long cavity (74) communicating with the threaded tube (72) is opened in the outer cover (73). A drive piston (75) extending into the threaded tube (72) is slidably fitted in the middle opening of the sealed long cavity (74). A grinding disc (77) that movably abuts the threaded rod (31) is rotatably connected to the drive piston (75). A driven piston plug (76) corresponding to the limiting ring groove (34) is slidably fitted in the openings on both sides of the sealed long cavity (74).

7. An automatic tool changer for a CNC machine tool according to claim 6, characterized in that, The connecting mechanism (8) includes a lifting bracket (81) that is slidably mounted on the movable frame (6) and used to rotatably mount the drive shaft (71). A second motor (82) is fixedly mounted on the movable frame (6). A ball screw (83) driven by the second motor (82) is rotatably mounted on the movable frame (6). A movable nut (84) is provided on the ball screw (83). A guide rod (85) that movably passes through the movable frame (6) and is fixedly connected to the lifting bracket (81) is fixedly connected to the movable nut (84). A drive gear column (86) is keyed to the ball screw (83), and a driven gear (87) that meshes with the drive gear column (86) is keyed to the drive shaft (71).

8. An automatic tool changer for a CNC machine tool according to claim 7, characterized in that, The thickness of the drive gear column (86) is three times the thickness of the driven gear (87).

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