A tool jaw mechanism without a hand magazine

Abstract

The utility model discloses a kind of knife jaw mechanisms of handless tool magazine, including fixed seat, first clamp jaw, second clamp jaw, sliding block, telescopic shaft, spring and cover plate, cover plate is fixed in the side of fixed seat, first clamp jaw and second clamp jaw are symmetrically arranged between cover plate and fixed seat, first clamp jaw and second clamp jaw are respectively rotatably connected with fixed seat, the side of fixed seat is equipped with the sliding way and central hole that pass through before and after, central hole is fixed with shaft sleeve, telescopic shaft is worn in shaft sleeve, spring is installed in the outside of telescopic shaft, rear end of telescopic shaft is used to connect the output end of pneumatic cylinder, sliding block is fixed in the front end of telescopic shaft, sliding block is slidably arranged in sliding way, the front end of sliding way is fixed with positioning key block, the two side surfaces of positioning key block are respectively contacted with first clamp jaw and second clamp jaw. The knife jaw mechanism is used for flat tool magazine, can provide larger clamping force to hold tool, avoid appearing card sword, drop sword phenomenon, can improve the security and stability of tool changing operation, ensure the machining efficiency of machine tool.

Description

Technical Field

[0001] This utility model relates to a tool magazine accessory for CNC machine tools, specifically a tool gripper mechanism for a handless tool magazine. Background Technology

[0002] In recent years, the development of tool magazines has transcended their role as machine tool accessories, evolving within their unique technological field to create products that align with the concepts of high precision, high efficiency, high reliability, and multi-tasking in machine tools. With industrial development and the pursuit of high speed, precision, and high efficiency, the demands on tool change time are constantly increasing as CNC machine tool cutting speeds rise. Traditional handless tool magazines suffer from insufficient clamping force in the tool pawls during tool changes, leading to tools easily being thrown out during high-speed magazine rotation. Furthermore, the excessive radial force exerted on the spindle during tool gripping can easily damage the spindle, severely impacting machine tool processing efficiency. Moreover, currently used handless tool magazines often lack foolproof pawl mechanisms, making it easy for operators to install tools backwards. Therefore, the tool pawls, a crucial component of the tool magazine, require further structural improvements. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a tool gripper mechanism without a hand-held tool magazine, which is used in a flat tool magazine and can provide a large clamping force to hold the tool, avoid tool jamming and tool falling, improve the safety and stability of tool changing operation, and ensure the processing efficiency of the machine tool.

[0004] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a handless knife magazine claw mechanism, including a fixed base, a first claw, a second claw, a slider, a telescopic shaft, a spring, and a cover plate. The cover plate is fixed to one side of the fixed base. The first claw and the second claw are symmetrically arranged between the cover plate and the fixed base. The first claw and the second claw are rotatably connected to the fixed base. A sliding track and a central hole are provided on one side of the fixed base. A bushing is fixed in the central hole. The telescopic shaft passes through the bushing. The spring is installed on the outside of the telescopic shaft. The rear end of the telescopic shaft is used to connect to the output end of a cylinder. The slider is fixed to the front end of the telescopic shaft. The slider is slidably arranged in the sliding track. A positioning key is fixed to the front end of the sliding track. The two sides of the positioning key contact and cooperate with the first claw and the second claw, respectively. The slider is used to move back and forth and push the first claw and the second claw to realize the opening and clamping of the first claw and the second claw.

[0005] The tool gripper mechanism of this utility model uses a cylinder to provide driving force, which drives the telescopic shaft to move back and forth along the bushing, and drives the slider to move back and forth along the slide rail, so as to realize the opening and clamping of the first gripper and the second gripper, thereby realizing the release and clamping of the tool.

[0006] When the cylinder provides thrust to the telescopic shaft, the telescopic shaft and the slider move forward, the spring compresses, and the first and second grippers open. When the telescopic shaft is no longer under the thrust of the cylinder, the spring rebounds and returns to its natural state.

[0007] The opening and clamping of the first and second grippers are controlled by a cylinder, providing a large clamping force. The extension stroke of the slider is limited by the positioning key block to avoid tool jamming and tool drop. This improves the safety and stability of tool changing operations and ensures the machining efficiency of the machine tool.

[0008] Preferably, the first gripper is rotatably connected to the fixed base via a first positioning pin, and the second gripper is rotatably connected to the fixed base via a second positioning pin. The first and second grippers are each provided with a pressing portion located in front of the slider. The middle and tail ends of the first gripper are respectively provided with a first arc surface and a first inclined surface, and the middle and tail ends of the second gripper are respectively provided with a second arc surface and a second inclined surface. The first arc surface is centered on the center line of the first positioning pin, and the second arc surface is centered on the center line of the second positioning pin. The two sides of the positioning key block are tangent to the first and second arc surfaces, respectively. The first and second inclined surfaces slope inwards from front to back towards the inner side of the slide. The slider has a third and a fourth inclined surface on each side. The third inclined surface has the same slope as the first inclined surface, and the fourth inclined surface has the same slope as the second inclined surface. During the opening and clamping process of the first and second grippers, the first and second grippers rotate around the first and second positioning pins respectively. During the movement, the first arc surface on the first gripper and the second arc surface on the second gripper remain tangent to the two sides of the positioning key block. This helps to ensure the reliability and stability of the opening and clamping action of the first and second grippers, and achieves precise tool changing.

[0009] Preferably, the first arc surface and the second arc surface are respectively disposed on the inner side of one of the top pressing parts.

[0010] Preferably, the fixed base has two symmetrically arranged limiting steps on one side. The tail ends of the first and second grippers are respectively located inside the two limiting steps. The cover plate is fixedly connected to the two limiting steps and the positioning key block. The two limiting steps can limit the retraction stroke of the slider and the clamping stroke of the first and second grippers, thereby limiting the clamping angle of the first and second grippers.

[0011] Preferably, the rear end of the fixed base is provided with a groove, and the rear end of the telescopic shaft is integrally provided with a positioning protrusion ring in the radial direction. The front end of the spring is located in the groove, and the rear end of the spring is limited by the positioning protrusion ring.

[0012] Preferably, the mounting base is integrally provided with a protrusion, which is located near the inner side of the front fork of the first gripper. The outer wall of the cutter that matches the cutter mechanism has a notch, and the protrusion is adapted to fit the notch. The protrusion, in conjunction with the notch on the outer wall of the cutter, serves to prevent mistaken installation and avoids the cutter being installed backwards.

[0013] Compared with existing technologies, this utility model has the following advantages: The tool gripper mechanism of this utility model is used in a horizontally mounted tool magazine. A cylinder provides the driving force, driving the telescopic shaft to move back and forth along the bushing, which in turn moves the slider back and forth along the slide rail, realizing the opening and closing of the first and second grippers, thereby achieving tool release. By controlling the opening and closing of the first and second grippers with a cylinder, a larger clamping force is provided to hold the tool. Furthermore, the positioning key block limits the extension stroke of the slider, preventing tool jamming and dropping, thus improving the safety and stability of tool changing operations and ensuring the machining efficiency of the machine tool. Attached Figure Description

[0014] Figure 1 This is an external view of the claw mechanism in the embodiment;

[0015] Figure 2 This is an external view of the claw mechanism in the embodiment after the cover plate has been removed;

[0016] Figure 3 This is a central cross-sectional view of the claw mechanism in the embodiment;

[0017] Figure 4 This is an external view of the mounting base in the embodiment;

[0018] Figure 5 This is an external view of the first gripper in the embodiment;

[0019] Figure 6 This is an external view of the second gripper in the embodiment;

[0020] The specific reference numerals in the figure are as follows:

[0021] 1-Fixed seat, 11-Limiting step, 12-Slide rail, 13-Center hole, 14-Shaft sleeve, 15-Protrusion, 16-Groove, 2-First gripper, 21-First positioning pin, 22-First arc surface, 23-First inclined surface, 3-Second gripper, 31-Second positioning pin, 32-Second arc surface, 33-Second inclined surface, 4-Slider, 41-Third inclined surface, 42-Fourth inclined surface, 5-Telescopic shaft, 51-Positioning protrusion ring, 6-Spring, 7-Cover plate, 8-Positioning key block, 9-Top pressing part. Detailed Implementation

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0023] The handless tool magazine gripper mechanism in the embodiment, such as Figures 1-6 As shown, the claw mechanism includes a fixed base 1, a first gripper 2, a second gripper 3, a slider 4, a telescopic shaft 5, a spring 6, and a cover plate 7. The cover plate 7 is fixed to one side of the fixed base 1. The first gripper 2 and the second gripper 3 are symmetrically arranged between the cover plate 7 and the fixed base 1. The first gripper 2 and the second gripper 3 are rotatably connected to the fixed base 1. Two limiting steps 11 are symmetrically arranged on one side of the fixed base 1, and a connecting slide 12 and a central hole 13 are provided at the front and back. The tail ends of the first gripper 2 and the second gripper 3 are respectively located inside the two limiting steps 11. The cover plate 7 is connected to the two limiting steps 11 and the fixed base 1 by screws. Positioning key 8 is fixedly connected, and bushing 14 is fixed in the center hole 13. Telescopic shaft 5 passes through bushing 14, and spring 6 is installed on the outside of telescopic shaft 5. The rear end of telescopic shaft 5 is used to connect to the output end of cylinder (not shown in the figure). Slider 4 is fixed to the front end of telescopic shaft 5 by threaded connection. Slider 4 is slidably disposed in slide rail 12. Positioning key 8 is fixed at the front end of slide rail 12. The two sides of positioning key 8 respectively contact and cooperate with the first gripper 2 and the second gripper 3. Slider 4 is used to move back and forth and push the first gripper 2 and the second gripper 3 to realize the opening and clamping of the first gripper 2 and the second gripper 3.

[0024] In this embodiment, the first gripper 2 is rotatably connected to the fixed base 1 via the first positioning pin 21, and the second gripper 3 is rotatably connected to the fixed base 1 via the second positioning pin 31. A pressing part 9 is provided in the middle of the first gripper 2 and the second gripper 3, and the pressing part 9 is located in front of the slider 4. A first arc surface 22 and a first inclined surface 23 are respectively provided in the middle and at the tail end of the first gripper 2. A second arc surface 32 and a second inclined surface 33 are respectively provided in the middle and at the tail end of the second gripper 3. The first arc surface 22 and the second arc surface 32 are respectively located on a pressing part 9. On the inner side, the first arc surface 22 is centered on the center line of the first positioning pin 21, and the second arc surface 32 is centered on the center line of the second positioning pin 31. The two sides of the positioning key block 8 are tangent to the first arc surface 22 and the second arc surface 32, respectively. The first inclined surface 23 and the second inclined surface 33 slope towards the inner side of the slide 12 from front to back. The two sides of the slider 4 are respectively provided with a third inclined surface 41 and a fourth inclined surface 42. The third inclined surface 41 has the same slope as the first inclined surface 23, and the fourth inclined surface 42 has the same slope as the second inclined surface 33. A protrusion 15 is integrally provided on the fixed base 1. The protrusion 15 is close to the inner side of the front fork of the first gripper 2. The outer wall of the tool (not shown in the figure) that matches the gripper mechanism is provided with a notch, and the protrusion 15 is adapted to the notch.

[0025] In this embodiment, the rear end of the fixed base 1 is provided with a groove 16, and the rear end of the telescopic shaft 5 is integrally provided with a positioning protrusion 51 in the radial direction. The front end of the spring 6 is located in the groove 16, and the rear end of the spring 6 is limited by the positioning protrusion 51.

[0026] The aforementioned handless tool magazine claw mechanism is used in a horizontal tool magazine. Its working principle is as follows: under the action of the cylinder, the telescopic shaft 5 and the slider 4 move forward. When the slider 4 hits the top pressing part 9 on the first gripper 2 and the second gripper 3, the first gripper 2 and the second gripper 3 open, and the spring 6 is in a compressed state. When the cylinder retracts, the spring 6 rebounds, driving the telescopic shaft 5 and the slider 4 to move backward. When the slider 4 moves backward and hits the tail end of the first gripper 2 and the second gripper 3, the first gripper 2 and the second gripper 3 clamp together, and then return to a natural state.

[0027] The aforementioned tool holder mechanism of the tool magazine controls the opening and closing of the first gripper 2 and the second gripper 3 through a cylinder to achieve tool release and clamping. It can provide a large clamping force to hold the tool, and the positioning key block 8 limits the extension stroke of the slider 4 to avoid tool jamming or falling off. This can improve the safety and stability of tool changing operations and ensure the processing efficiency of the machine tool.

Claims

1. A tool gripper mechanism without a hand-held tool magazine, characterized in that, The device includes a fixed base, a first gripper, a second gripper, a slider, a telescopic shaft, a spring, and a cover plate. The cover plate is fixed to one side of the fixed base. The first and second grippers are symmetrically arranged between the cover plate and the fixed base, and are rotatably connected to the fixed base. One side of the fixed base has a connecting slide rail and a central hole. A bushing is fixed in the central hole, and the telescopic shaft passes through the bushing. The spring is installed on the outside of the telescopic shaft, and the rear end of the telescopic shaft is used to connect to the output end of a cylinder. The slider is fixed to the front end of the telescopic shaft and is slidably disposed in the slide rail. A positioning key is fixed to the front end of the slide rail, and the two sides of the positioning key contact and engage with the first and second grippers, respectively. The slider is used to move back and forth and push the first and second grippers to open and clamp them.

2. The handless tool magazine gripper mechanism according to claim 1, characterized in that, The first gripper is rotatably connected to the fixed base via a first positioning pin, and the second gripper is rotatably connected to the fixed base via a second positioning pin. The first and second grippers are each provided with a pressing portion located in front of the slider. The middle and tail ends of the first gripper are respectively provided with a first arc surface and a first inclined surface, and the middle and tail ends of the second gripper are respectively provided with a second arc surface and a second inclined surface. The first arc surface is centered on the center line of the first positioning pin, and the second arc surface is centered on the center line of the second positioning pin. The two sides of the positioning key block are tangent to the first and second arc surfaces, respectively. The first and second inclined surfaces slope inwards from front to back towards the inner side of the slide. The slider has a third and a fourth inclined surface on each side. The third inclined surface has the same slope as the first inclined surface, and the fourth inclined surface has the same slope as the second inclined surface.

3. The handless tool magazine gripper mechanism according to claim 2, characterized in that, The first arc surface and the second arc surface are respectively located on the inner side of one of the top pressing parts.

4. The handless tool magazine gripper mechanism according to claim 1, characterized in that, Two limiting steps are symmetrically arranged on one side of the fixed base. The tail ends of the first and second grippers are respectively located on the inner side of the two limiting steps. The cover plate is fixedly connected to the two limiting steps and the positioning key block.

5. The handless tool magazine gripper mechanism according to claim 1, characterized in that, The rear end of the fixed base is provided with a groove, and the rear end of the telescopic shaft is integrally provided with a positioning protrusion ring in the radial direction. The front end of the spring is located in the groove, and the rear end of the spring is limited by the positioning protrusion ring.

6. The handless tool magazine gripper mechanism according to claim 1, characterized in that, The fixed base is integrally provided with a protrusion, which is close to the inner side of the front fork of the first gripper. The outer wall of the blade that matches the gripper mechanism is provided with a notch, and the protrusion is adapted to the notch.

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