Cutter handle clamping device of numerical control machine tool and numerical control machine tool

Abstract

The utility model relates to a numerical control machine tool handle clamping device and a numerical control machine tool, the device comprises a base, a clamping jaw and an elastic piece, the base is provided with a groove, the clamping jaw comprises a first clamping arm and a second clamping arm which are separated from each other, one end of the first clamping arm is provided with a first limiting bulge, and one end of the second clamping arm is provided with a second limiting bulge; one end of the first clamping arm and one end of the second clamping arm are detachably and movably connected with the base, the first clamping arm and the second clamping arm are symmetrically arranged, and the first limiting protrusion and the second limiting protrusion are arranged at the two ends of the groove respectively. The elastic piece is arranged in the groove and located between one end of the first limiting protrusion and one end of the second limiting protrusion. The clamping jaw can provide stable clamping force and prolong the service life of the clamping jaw, so that the clamping jaw does not need to be replaced frequently, the maintenance cost and the operation risk of a machine tool are greatly reduced, and the effective working time of the machine tool is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of clamps, in particular to a tool holder clamping device for a numerically controlled machine tool and a numerically controlled machine tool. Background Art

[0002] Currently, the tool holders used to hold the toolholders in tool magazines for most small CNC machining centers are limited by the magazine's size. Therefore, these claws are typically made of one-piece engineering plastics. These rely on the material's inherent elasticity and strength to hold the tool, prevent the handle from being thrown out during magazine movement, and maintain the tool's absolute position within the magazine. However, with increased use and material aging, the claws begin to experience insufficient grip and breakage, necessitating regular replacement and resulting in high maintenance costs. Utility Model Content

[0003] Based on this, it is necessary to provide a CNC machine tool tool holder clamping device and a CNC machine tool to address the problem that the integrated tool claw has a short service life and causes high maintenance costs, so as to increase the service life of the tool claw and reduce the maintenance cost.

[0004] In a first aspect, the present invention provides a tool holder clamping device for a CNC machine tool, comprising a base, a clamping claw, and an elastic member, wherein the base is provided with a groove, the clamping claw comprises a first clamping arm and a second clamping arm, one end of the first clamping arm is provided with a first limiting protrusion, and one end of the second clamping arm is provided with a second limiting protrusion;

[0005] One end of the first clamping arm and one end of the second clamping arm are detachably connected to the base, and the first clamping arm and the second clamping arm are symmetrically arranged, and the first limiting protrusion and the second limiting protrusion are respectively placed at the two ends of the groove; the elastic member is arranged in the groove and is located between one end of the first limiting protrusion and the second limiting protrusion.

[0006] In some embodiments, one end of the first clamping arm and one end of the second clamping arm are movably connected to the base via pins respectively.

[0007] In some embodiments, a first guide ridge extending from one end of the first clamping arm to the other end is provided on the inner side of the first clamping arm, and a second guide ridge extending from one end of the second clamping arm to the other end is provided on the inner side of the second clamping arm.

[0008] In some embodiments, an edge of the base near the clamping space formed by the first clamping arm and the second clamping arm is a curved surface.

[0009] In some embodiments, an upper cover is further included, and the upper cover is connected to the base by bolts.

[0010] In some embodiments, an edge of the upper cover close to the clamping space formed by the first clamping arm and the second clamping arm is an oblique arc surface.

[0011] In some embodiments, a positioning boss is provided at one end of the base away from the groove, and a positioning recess is provided on the upper cover to match the positioning boss.

[0012] In some embodiments, the thickness of the upper cover corresponding to the upper cover position connected to the first clamping arm and the second clamping arm is smaller than the thickness of one end of the first clamping arm and the thickness of one end of the second clamping arm.

[0013] In some embodiments, the elastic member is a spring or a tension rope.

[0014] In a second aspect, the present invention further provides a CNC machine tool, comprising the above-mentioned CNC machine tool tool holder clamping device.

[0015] Compared with the prior art, the present invention has at least the following beneficial effects:

[0016] By arranging an elastic member between the first clamping arm and the second clamping arm, the elastic member is utilized to provide clamping force for the clamping claw. Compared with the integrated knife claw that relies on the elasticity and strength of the material itself to provide clamping force, the utility model can provide stable clamping force and increase the service life of the clamping claw, so that the clamping claw does not need to be replaced frequently, which greatly reduces the maintenance cost and operation risk of the machine tool and increases the effective working time of the machine tool; by detachably connecting the clamping claw to the base to facilitate the replacement of damaged accessories, compared with the integrated knife claw that needs to be replaced as a whole, the utility model can reduce the maintenance cost of accessories; by arranging a groove to cooperate with the first limiting protrusion and the second limiting protrusion, the clamping claw can automatically adapt to tool handles of different specifications and automatically reset when the tool handle is not clamped. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram of a tool holder clamping device for a CNC machine tool according to an embodiment of the present invention;

[0018] Figure 2 This is a schematic structural diagram of an exploded perspective of a tool holder clamping device for a CNC machine tool according to one embodiment of the present invention;

[0019] Figure 3 This is a schematic structural diagram of a tool holder clamping device for a CNC machine tool according to another embodiment of the present invention;

[0020] Figure 4 This is a schematic diagram of a partial structure of a tool holder clamping device for a CNC machine tool according to another embodiment of the present invention from an exploded perspective;

[0021] Figure 5This is a schematic diagram of the structural state of a tool holder clamping device for a CNC machine tool when clamping a tool holder, shown as an embodiment of the present utility model. DETAILED DESCRIPTION

[0022] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, the following detailed description of specific embodiments of the present invention is provided in conjunction with the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0023] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time. In contrast, when an element is referred to as being "directly on" another element, there is no intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only."

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of this invention are intended only to describe specific embodiments and are not intended to limit this invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0025] See also Figures 1 to 2 The tool holder clamping device for a CNC machine tool shown in the embodiment of the present utility model includes a base 1, a clamping claw 2 and an elastic member 3. The base 1 is provided with a groove 11. The clamping claw 2 includes a first clamping arm 21 and a second clamping arm 22. One end of the first clamping arm 21 is provided with a first limiting protrusion 211, and one end of the second clamping arm 22 is provided with a second limiting protrusion 221.

[0026] One end of the first clamping arm 21 and one end of the second clamping arm 22 are detachably connected to the base, and the first clamping arm 21 and the second clamping arm 22 are symmetrically arranged, and the first limiting protrusion 211 and the second limiting protrusion 221 are respectively placed at the two ends of the groove 11; the elastic member 3 is arranged in the groove 11 and is located between one end of the first limiting protrusion 211 and the second limiting protrusion 221.

[0027] In this embodiment, an elastic member is provided between the first clamping arm 21 and the second clamping arm 22 to utilize the elastic member 3 to provide clamping force for the clamping claw 2. Compared with the one-piece knife claw that relies on the elasticity and strength of the material itself to provide clamping force, this embodiment can provide stable clamping force and increase the service life of the clamping claw 2, so that there is no need to frequently replace the clamping claw 2, which greatly reduces the maintenance cost and operation risk of the machine tool and increases the effective working time of the machine tool; by detachably connecting the clamping claw 2 to the base 1 to facilitate the replacement of damaged accessories, compared with the one-piece knife claw that needs to be replaced as a whole, this embodiment can reduce the maintenance cost of accessories; by providing a groove 11 to cooperate with the first limiting protrusion 211 and the second limiting protrusion 221 to limit the opening and closing degree of the clamping claw 2, the clamping claw 2 can automatically adapt to tool handles of different specifications and automatically reset when the tool handle is not clamped.

[0028] Alternatively, as Figure 2 As shown, one end of the first clamping arm 21 and one end of the second clamping arm 22 are movably connected to the base 1 through the pin 12 respectively, so as to realize the detachable and movable clamping claw 2.

[0029] In some embodiments, as Figure 2 As shown, a first guide ridge 212 is provided on the inner side of the first clamping arm 21 from one end to the other end of the first clamping arm 21 , and a second guide ridge 222 is provided on the inner side of the second clamping arm 22 from one end to the other end of the second clamping arm 22 .

[0030] In this embodiment, a long guide ridge is provided from one end of the clamping arm to the other end, so as to guide the tool handle when the tool handle contacts the clamping claw 2 and limit the Z-direction movement of the tool handle, so that the tool changing operation is smoother and the impact force transmitted to the tool magazine is smaller and smoother, thereby reducing damage to the clamping claw 2 and increasing the service life of the clamping claw 2.

[0031] In some embodiments, as Figure 1 As shown, the edge of the base close to the clamping space formed by the first clamping arm 21 and the second clamping arm 22 is a curved surface 13. Since the handle is usually round, the edge of the base is set as the curved surface 13, which can better fit the handle.

[0032] In some embodiments, as Figure 3 As shown, it also includes an upper cover 4, which is connected to the base 1 by bolts 41. The addition of the upper cover in this embodiment can prevent foreign matter from entering the groove 11 and affecting the operation of the elastic member 3, thereby reducing the failure rate of the clamping device.

[0033] In some embodiments, as Figure 3As shown, the edge of the upper cover near the clamping space formed by the first clamping arm 21 and the second clamping arm 22 is an oblique arc surface 14. In this embodiment, the oblique arc surface of the upper cover is configured to regulate the range of motion of the clamping claws while reducing the gap between the groove 11 and the outside world, thereby reducing the possibility of foreign matter entering the groove 11 and reducing the failure rate.

[0034] In some embodiments, as Figure 4 As shown, the base 1 is provided with a positioning boss 15 at one end away from the groove 11, and the upper cover 4 is provided with a positioning recess 41 adapted to the positioning boss 15. The positioning boss 15 and the positioning recess 41 of this embodiment match each other, evenly distributing the impact force exerted on the base 1 and upper cover 4 when changing the tool, thereby increasing the service life of the tool claws and facilitating assembly.

[0035] In some embodiments, as Figure 4 As shown, the thickness of the upper cover corresponding to the upper cover position 42 connecting the first clamping arm 21 and the second clamping arm 22 is less than the thickness of one end of the first clamping arm 21 and the thickness of one end of the second clamping arm 22. This embodiment optimizes the upper cover wall thickness, allowing the upper cover position 42 to deform to a limited extent to protect the tool magazine in the event of a collision caused by a tool magazine sensor failure.

[0036] Optionally, the elastic member 3 is a spring or a tension rope. When the elastic member 3 is between the pin and the other end of the clamp arm, the elastic member 3 is a tension rope; when the pin is between the elastic member 3 and the other end of the clamp arm, the elastic member 3 is a spring.

[0037] like Figure 5 As shown, a CNC machine tool according to an embodiment of the present invention includes the above-mentioned CNC machine tool tool holder clamping device A, which is used to clamp the tool holder B.

[0038] In this embodiment, the clamping force is provided by a spring, while the base and upper cover limit the opening and closing of clamping jaws 2. When the tool holder is mounted on the machine tool spindle, the machine's X-axis moves the tool holder toward the clamping space of clamping jaws 2, expanding them. At this point, the spring is compressed. When the tool holder reaches the center of the circle of clamping jaws 2, the spring expands, fully gripping the tool holder. The spindle releases the tool holder, completing the tool change.

[0039] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0040] The above-described embodiments merely represent several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present utility model patent shall be determined by the appended claims.

Claims

1. A tool holder clamping device for a CNC machine tool, characterized in that: The clamping claw comprises a base, a clamping claw and an elastic member, wherein the base is provided with a groove, and the clamping claw comprises a first clamping arm and a second clamping arm that are separated, wherein one end of the first clamping arm is provided with a first limiting protrusion, and one end of the second clamping arm is provided with a second limiting protrusion; One end of the first clamping arm and one end of the second clamping arm are detachably connected to the base, and the first clamping arm and the second clamping arm are symmetrically arranged, and the first limiting protrusion and the second limiting protrusion are respectively placed at the two ends of the groove; the elastic member is arranged in the groove and is located between one end of the first limiting protrusion and the second limiting protrusion.

2. The tool holder clamping device for CNC machine tools according to claim 1, characterized in that: One end of the first clamping arm and one end of the second clamping arm are movably connected to the base through pins respectively.

3. The tool holder clamping device for CNC machine tools according to claim 1, characterized in that: A first guide ridge extending from one end to the other end of the first clamping arm is provided on the inner side of the first clamping arm, and a second guide ridge extending from one end to the other end of the second clamping arm is provided on the inner side of the second clamping arm.

4. The tool holder clamping device for CNC machine tools according to claim 1, characterized in that: The edge of the base close to the clamping space formed by the first clamping arm and the second clamping arm is a curved surface.

5. The tool holder clamping device for CNC machine tools according to claim 1, characterized in that: It also includes an upper cover, which is connected to the base through bolts.

6. The tool holder clamping device for CNC machine tools according to claim 5, characterized in that: The edge of the upper cover close to the clamping space formed by the first clamping arm and the second clamping arm is an oblique arc surface.

7. The tool holder clamping device for CNC machine tools according to claim 5, characterized in that: A positioning boss is provided at one end of the base away from the groove, and a positioning recessed portion adapted to the positioning boss is provided on the upper cover.

8. The tool holder clamping device for CNC machine tools according to claim 5, characterized in that: The thickness of the upper cover corresponding to the upper cover position connected to the first clamping arm and the second clamping arm is smaller than the thickness of one end of the first clamping arm and the thickness of one end of the second clamping arm.

9. The tool holder clamping device for CNC machine tools according to claim 1, characterized in that: The elastic member is a spring or a tension rope.

10. A CNC machine tool, characterized in that: It comprises the tool holder clamping device for a CNC machine tool as described in any one of claims 1 to 9.

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