Tool changing device for machine tools

Abstract

This utility model relates to the field of machine tool technology, and in particular to a machine tool tool clipping device, including a ram and a clipping assembly. A spindle is housed inside the ram, with a milling cutter head at the front end and the clipping assembly at the rear end. The clipping assembly includes a clipping bracket, which is screwed into the ram. A clipping cylinder is mounted at the rear of the clipping bracket, and a clipping hammer through-hole is provided on the clipping bracket. A guide sleeve is fixedly mounted at the front of the clipping bracket, with its installation position corresponding to the clipping hammer through-hole. A linkage groove is provided inside the guide sleeve, and a connecting plate is located within the linkage groove. An oilless bearing is located inside the guide sleeve, and a clipping sleeve is movably mounted within the oilless bearing. The clipping sleeve contacts and is fixedly connected to the connecting plate. This utility model's tool clipping device has a simple and reliable structure, and the clipping operation is smooth. After the spindle completes the tool release action and needs to perform a tool gripping action, the clipping sleeve can quickly reset after the piston rod retracts, avoiding the risk of spindle damage.

Description

Technical Field

[0001] This utility model relates to the field of machine tool technology, and more specifically, to a machine tool tool clipping device. Background Technology

[0002] Tool changing is an essential step in the machining process of a machine tool. Currently, tool changing is typically achieved by driving the tool changing sleeve and tool changing disc with the piston rod of a hydraulic cylinder or pneumatic-hydraulic booster cylinder. However, existing technologies have the following problems:

[0003] While the piston rod of a hydraulic cylinder or pneumatic-hydraulic booster cylinder can self-reset after driving the tool change, the tool-changing sleeve only performs the tool-changing action and lacks an automatic reset mechanism. Since the spindle speed is typically 6000-8000 revolutions per minute, if the tool-changing sleeve fails to reset in time and disengage from the spindle's tool-changing disc, the spindle will be at risk of damage. Furthermore, the tool-changing sleeve reset mechanism in existing tool-changing devices is relatively complex and requires regular inspection to ensure the proper functioning of the tool-changing function, which increases the maintenance cost and complexity of the equipment.

[0004] Therefore, there is an urgent need for a simple and stable cutting device to solve the above problems. Utility Model Content

[0005] To address the shortcomings of existing solutions, the purpose of this invention is to provide a machine tool tool release device that is simple in structure and stable in operation, capable of quickly resetting the spindle after the tool release action is completed, thus avoiding the risk of spindle damage and improving the machining accuracy and lifespan of the machine tool.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A machine tool tool clipping device includes a ram and a tool clipping assembly. The ram has a spindle inside, a milling cutter head is provided at the front end of the spindle, and the tool clipping assembly is provided at the rear end of the spindle.

[0008] The knife-breaking assembly includes a knife-breaking bracket, which is installed inside the slide block by screws. A knife-breaking cylinder is installed at the rear of the knife-breaking bracket. The knife-breaking bracket has a through hole for a knife-breaking hammer head. A guide sleeve is fixedly installed at the front of the knife-breaking bracket, and the installation position of the guide sleeve corresponds to the through hole for the knife-breaking hammer head. A linkage groove is provided inside the guide sleeve, and a connecting plate is provided inside the linkage groove. An oil-free bearing is provided inside the guide sleeve, and a knife-breaking sleeve is movably installed inside the oil-free bearing. The knife-breaking sleeve contacts and is fixedly connected to the connecting plate.

[0009] Furthermore, the rear end of the machine tool spindle is connected to a tool-changing disc and a rotary joint, the rotary joint being located inside the tool-changing sleeve.

[0010] Furthermore, the linkage groove is provided with several compression springs, and multiple sets of first positioning holes are provided on one side of the connecting plate. Multiple sets of second positioning holes are provided at the bottom of the linkage groove. The two ends of the compression springs are respectively inserted into the first positioning holes and the second positioning holes.

[0011] Furthermore, the guide sleeve has a guide groove on its side wall, and a guide pin is provided in the guide groove. The guide pin is fixedly installed on the connecting plate.

[0012] In actual use, when the spindle needs to release the cutter, pressure is applied to the cutter cylinder, causing the piston rod of the cutter cylinder to extend outward. The piston rod presses against the connecting plate, which moves along the guide hole through the guide pin and drives the cutter sleeve to move towards the spindle. At the same time, the connecting plate compresses the spring. The cutter sleeve applies pressure to the cutter disc, which transmits the pressure to the spindle, compressing the disc spring at the connection between the spindle and the milling cutter head, thus releasing the cutter from the spindle.

[0013] When the spindle needs to perform a tool-grabbing action, the pressure in the tool-catch cylinder is released, causing the piston rod to retract. The connecting plate and the tool-catch sleeve quickly reset under the action of the compression spring. The tool-catch sleeve disengages from the tool-catch disc of the spindle, reducing the pressure on the spindle. After the pressure is released, the disc spring resumes its tension, tightening the tool and realizing the tool-grabbing action of the spindle. The timely reset of the tool-catch sleeve can prevent damage to the spindle.

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

[0015] 1. The tool-cutting device of this utility model has a simple and reliable structure, and the tool-cutting operation is stable. After the spindle completes the tool-releasing action, when the tool-grabbing action needs to be performed, the tool-cutting sleeve can quickly reset after the piston rod retracts, avoiding the risk of spindle damage.

[0016] 2. The cutting device of this utility model has a simple structure, reduces the use of complex parts, and lowers the failure rate and maintenance cost of the equipment.

[0017] 3. The cutting device of this utility model operates smoothly. Through the cooperation of the guide pin and guide hole, as well as the setting of the oilless bearing, the cutting action is more stable and the machining accuracy is improved. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0019] Figure 2 This is a partial cross-sectional view of the slide block in this utility model.

[0020] Figure 3 This is a schematic diagram of the blade assembly in this utility model.

[0021] Figure 4 This is a schematic diagram showing the disassembled structure of the blade assembly in this utility model.

[0022] Figure 5 This is a schematic diagram of the structure of the cutting tool sleeve and the guide sleeve in this utility model.

[0023] Figure 6 This is a schematic diagram showing the disassembled structure of the cutter sleeve and guide sleeve in this utility model.

[0024] Figure 7 This is a schematic diagram showing the disassembly of the cutter sleeve and guide sleeve from another angle in this utility model.

[0025] In the diagram: 1. Slide; 2. Cutting tool assembly; 21. Cutting tool disc; 22. Cutting tool support; 23. Cutting tool sleeve; 24. Rotary joint; 25. Guide sleeve; 26. Cutting tool cylinder; 27. Cutting tool hammer through hole; 28. Connecting plate; 29. ​​First positioning hole; 210. Compression spring; 211. Oil-free bearing; 212. Guide groove; 213. Guide pin; 214. Second positioning hole; 215. Linkage groove; 3. Spindle; 4. Milling cutter head. Detailed Implementation

[0026] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0027] Example:

[0028] like Figures 1 to 7 As shown, a machine tool tool cutting device includes a slide 1 and a tool cutting assembly 2. The slide 1 is equipped with a spindle 3, the front end of the spindle 3 is equipped with a milling cutter head 4, and the rear end of the spindle 3 is equipped with the tool cutting assembly 2.

[0029] The knife-breaking assembly 2 includes a knife-breaking bracket 22, which is installed inside the slide block 1 by screws. A knife-breaking cylinder is installed at the rear of the knife-breaking bracket 22. The knife-breaking bracket 22 is provided with a knife-breaking hammer head through hole 27. The piston rod of the knife-breaking cylinder passes through the knife-breaking hammer head through hole 27 and is fixedly connected to the connecting plate 28. A guide sleeve 25 is fixedly installed at the front of the knife-breaking bracket 22, and the installation position of the guide sleeve 25 corresponds to the knife-breaking hammer head through hole 27. A linkage groove 215 is provided inside the guide sleeve 25. The linkage groove 215 is connected to the inside of the guide sleeve 25. The linkage groove 215 is cylindrical, and the diameter of the guide sleeve 25 is smaller than the diameter of the linkage groove 215. A connecting plate 28 is provided inside the linkage groove 215, and an oil-free bearing 211 is provided inside the guide sleeve 25. A cutting sleeve 23 is movably installed inside the oil-free bearing 211. When the cutting sleeve 23 moves along the guide cavity, the oil-free bearing 211 can eliminate the gap between the guide sleeve 25 and the cutting sleeve 23, making the cutting action of the cutting sleeve 23 more stable. The cutting sleeve 23 contacts and is fixedly connected to the connecting plate 28. This cutting assembly 2 has a simple and reliable structure, and the cutting operation is stable. After the spindle 3 completes the cutting action and needs to perform the cutting action, the cutting sleeve 23 can quickly reset after the piston rod retracts, avoiding the risk of damage to the spindle 3.

[0030] The cutter sleeve 23 and the connecting plate 28 are fixedly connected by screws. The connecting plate 28 and the cutter sleeve 23 are in direct contact and fixedly connected together, so that the connecting plate 28 and the cutter sleeve 23 can be used as a whole part. This makes the response to the cutter action more timely, the transmission more stable, the consistency better, and improves the strength of the connecting plate 28 and the cutter sleeve 23.

[0031] In this embodiment, the rear end of the machine tool spindle 3 is connected to a tool holder 21 and a rotary joint 24, with the rotary joint 24 located inside the tool holder sleeve 23.

[0032] In this embodiment, the linkage groove 215 is provided with a plurality of compression springs 210, and a plurality of first positioning holes 29 distributed in a circumferential direction are provided on one side of the connecting plate 28. The bottom of the linkage groove 215 is provided with a plurality of second positioning holes 214 distributed in a circumferential direction. One end of the compression spring 210 is installed in the first positioning hole 29, and the other end is installed in the second positioning hole 214.

[0033] In this embodiment, a guide groove 212 is provided on the side wall of the guide sleeve 25. The guide groove 212 is elongated, and its length direction is the same as the axial direction of the guide sleeve 25. The guide groove 212 is connected to the linkage groove 215. A guide pin 213 is movably disposed in the guide groove 212 and is fixedly installed on the connecting plate 28. When the connecting plate 28 moves within the linkage groove 215, the guide pin 213 guides the movement of the connecting plate 28, making the cutting action smoother.

[0034] The cutter cylinder is either a hydraulic cylinder or a pneumatic-hydraulic booster cylinder.

[0035] The working principle of this machine tool tool clipping device:

[0036] In use, when the spindle 3 needs to release the cutter, pressure is applied to the cutter cylinder, causing the piston rod of the cutter cylinder to extend outward. The piston rod presses the connecting plate 28, and the connecting plate 28 moves along the guide groove 212 through the guide pin 213, driving the cutter sleeve 23 to move towards the spindle 3. At the same time, the connecting plate 28 compresses the spring 210. The cutter sleeve 23 applies pressure to the cutter disc 21, and the cutter disc 21 transmits the pressure to the spindle 3, compressing the disc spring at the connection between the spindle 3 and the milling cutter head 4, and causing the spindle 3 to release the cutter.

[0037] When the spindle 3 needs to perform a tool-grabbing action, the pressure of the tool-crushing cylinder is released, causing the piston rod to retract. The connecting plate 28 and the tool-crushing sleeve 23 quickly reset under the action of the compression spring 210. The tool-crushing sleeve 23 disengages from the tool-crushing disc 21 of the spindle 3, reducing the pressure on the spindle 3. After the pressure is released, the disc spring recovers its tension, tightening the tool and realizing the tool-grabbing action of the spindle 3. The timely reset of the tool-crushing sleeve 23 can prevent damage to the spindle 3.

[0038] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. For those skilled in the art, other variations or modifications can be made based on the above description. It is impossible to exhaustively list all the implementation methods here. Any obvious variations or modifications derived from the technical solutions of this utility model are still within the protection scope of this utility model.

Claims

1. A machine tool tool changing device, characterized by: It includes a slide (1) and a cutter assembly (2). The slide (1) has a spindle (3) inside, a milling cutter head (4) is provided at the front end of the spindle (3), and a cutter assembly (2) is provided at the rear end of the spindle (3). The knife-breaking assembly (2) includes a knife-breaking bracket (22), which is installed inside the slide block (1) by screws. A knife-breaking cylinder is installed at the rear of the knife-breaking bracket (22). A knife-breaking hammer head through hole (27) is provided on the knife-breaking bracket (22). A guide sleeve (25) is fixedly installed at the front of the knife-breaking bracket (22), and the installation position of the guide sleeve (25) corresponds to the knife-breaking hammer head through hole (27). A linkage groove (215) is provided inside the guide sleeve (25). A connecting plate (28) is provided inside the linkage groove (215). An oil-free bearing (211) is provided inside the guide sleeve (25). A knife-breaking sleeve (23) is movably installed inside the oil-free bearing (211). The knife-breaking sleeve (23) is in contact with and fixedly connected to the connecting plate (28).

2. The machine tool tool changing device according to claim 1, characterized in that: The machine tool spindle (3) is connected to a tool holder (21) and a rotary joint (24) at its rear end. The rotary joint (24) is located inside the tool holder sleeve (23).

3. The machine tool tool changing device according to claim 1, characterized in that: The linkage groove (215) is provided with several compression springs (210), and the connecting plate (28) is provided with multiple sets of first positioning holes (29) on one side. The linkage groove (215) is provided with multiple sets of second positioning holes (214) at the bottom. The two ends of the compression springs (210) are respectively inserted into the first positioning holes (29) and the second positioning holes (214).

4. The machine tool tool breaking device according to claim 1, characterized in that: The guide sleeve (25) has a guide groove (212) on its side wall, and a guide pin (213) is provided in the guide groove (212). The guide pin (213) is fixedly installed on the connecting plate (28).

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