Two-stage locking and holding drill bit grinder anti-breaking mechanism

Abstract

This invention discloses a two-stage locking and holding type drill bit grinding machine anti-breakage mechanism, including a drill chuck, a first sleeve held in the drill chuck, and a drill bit inserted into the first sleeve; one end of the first sleeve is provided with several first slots, and the other end is provided with a second slot, with a fixing tube fixedly connected to the outer surface of the middle part; the first slots and second slots divide the end of the first sleeve into several spring pieces, and a wedge block is fixedly connected to the spring piece at the front end of the first sleeve; the outer surface of the fixing tube is provided with external threads, and a second sleeve is screwed onto the external threads; the inner wall of the front end of the second sleeve presses the spring piece at the front end of the first sleeve against the outer circumference of the drill bit through the wedge block. By rotating the second sleeve, the second sleeve advances along the central axis of the first sleeve until the inner wall of the front end of the second sleeve presses the spring piece at the front end of the first sleeve against the outer circumference of the drill bit through the wedge block. This enhances the strength of the drill bit and prevents it from breaking due to vibration.

Description

Technical Field

[0001] This invention relates to a two-stage locking and holding drill bit grinding machine anti-breakage mechanism, and particularly to its first sleeve, belonging to the technical field of grinding equipment. Background Technology

[0002] By mounting a drill bit on a drill chuck and bringing it into contact with a rotating grinding disc, a sharp cutting edge gradually forms at the tip of the drill bit during the relative movement between the drill bit and the grinding disc. During this process, the drill bit vibrates violently and often breaks. The reason for this is that the drill bit is relatively thin, and the drill chuck can only hold the tip, leaving the middle section of the drill bit without support. The structure of the drill chuck is shown in Chinese Patent CN101912982B. The diameter of the drill chuck is much larger than the diameter of the drill bit. If the tip of the drill bit is fixed in the drill chuck, the chuck will interfere with the grinding disc, making grinding impossible. Therefore, how to support the tip of the drill bit and strengthen it during the grinding process is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0003] To overcome the above-mentioned shortcomings, the purpose of this invention is to provide a two-stage locking and holding drill bit grinding machine anti-breakage mechanism.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a double-stage locking and holding drill bit grinding machine anti-breakage mechanism, including a drill chuck, the drill chuck having several jaws; a first sleeve is held in the jaws, a drill bit is inserted into the first sleeve, the end of the drill bit is flush with the end of the first sleeve, and the other end extends out of the first sleeve; one end of the first sleeve is provided with several first slots, the other end is provided with a second slot, and a fixing tube is fixedly connected to the outer surface of the middle part; the first slots and the second slots divide the end of the first sleeve into several spring pieces, and a wedge block is fixedly connected to the spring piece at the front end of the first sleeve; the outer surface of the fixing tube is provided with external threads, and a second sleeve is screwed onto the external threads; the inner wall of the front end of the second sleeve presses the spring piece at the front end of the first sleeve against the outer periphery of the drill bit through the wedge block; The end of the second sleeve is provided with a threaded hole, and a bolt is screwed into the threaded hole. The bolt is inserted into any one of the first slots.

[0005] The front end of the second sleeve is fixedly connected to a bearing, which includes an outer ring, a number of balls, a rotating frame and an inner ring. The outer ring is fixedly connected to the second sleeve, and a second groove is provided on the inner wall of the outer ring. The number of balls are disposed between the outer ring and the inner ring and are located in the second groove. The rotating frame is disposed on the number of balls.

[0006] The invention is further configured such that: the inner ring is replaced by the middle part of the first sleeve and the wedge block, and the middle part of the first sleeve and the wedge block are provided with a first groove; a plurality of balls are located in the first groove and the second groove.

[0007] A further feature of the present invention is that the plane containing the first groove is perpendicular to the plane containing the second groove.

[0008] A further feature of the present invention is that the side of the wedge block facing the outer ring is an arc surface.

[0009] Compared with the prior art, the beneficial effects of this invention are: without changing the structure of the existing drill chuck, a first sleeve is fitted around the outer periphery of the drill bit. One end of the first sleeve has several first slots, and the other end has a second slot. The end spring of the first sleeve and the end of the drill bit are clamped together by several jaws. The front end of the drill bit extends from the first sleeve and contacts the grinding disc for grinding. A fixing tube is fixedly connected to the outer surface of the middle part of the first sleeve; the outer surface of the fixing tube has external threads, and a second sleeve is screwed onto these threads. By rotating the second sleeve, it advances along the central axis of the first sleeve until the inner wall of the front end of the second sleeve presses the end spring of the first sleeve against the outer periphery of the drill bit through a wedge block. This provides support for the front section of the drill bit, clamping the front section of the first sleeve onto the front section of the drill bit, and fixing them together. This enhances the strength of the drill bit and prevents it from breaking due to vibration. Attached Figure Description

[0010] Figure 1 This is an exploded structural diagram of the anti-broken drill bit mechanism of a two-stage locking and holding drill bit grinding machine; Figure 2 A schematic diagram of the anti-broken drill bit mechanism of a two-stage locking and holding drill bit grinding machine in use; Figure 3 A schematic diagram of the bolt, the second sleeve, and the first slit; Figure 4 This is a schematic diagram of the bearing structure; Figure 5 This is a schematic diagram of the outer ring, ball bearings, and the first groove.

[0011] In the diagram: 1. Drill chuck; 2. First sleeve; 3. First slot; 4. Second slot; 5. Drill bit; 6. Wedge block; 8. Fixed tube; 9. Second sleeve; 10. Threaded hole; 11. Bolt; 12. Clamping jaw; 13. Bearing; 14. Outer ring; 15. Ball bearing; 16. Rotating frame; 17. First groove; 18. Second groove. Detailed Implementation

[0012] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention.

[0013] Example 1: See Appendix Figure 1-5As shown, the anti-broken drill bit mechanism of the double-stage locking and holding drill bit grinding machine in this embodiment includes a drill chuck 1, which has a plurality of jaws 12; a first sleeve 2 is held in the jaws 12, and a drill bit 5 is inserted into the first sleeve 2. The end of the drill bit 5 is flush with the end of the first sleeve 2, and the other end extends out of the first sleeve 2; a plurality of first slots 3 are provided at one end of the first sleeve 2, and a second slot 4 is provided at the other end. A fixing tube 8 is fixedly connected to the outer surface of the middle part; the first slots 3 and the second slots 4 divide the end of the first sleeve 2 into a plurality of spring pieces. A wedge block 6 is fixedly connected to the spring piece at the front end of the first sleeve 2; the outer surface of the fixing tube 8 is provided with an external thread, and a second sleeve 9 is screwed onto the external thread; the inner wall of the front end of the second sleeve 9 presses the spring piece at the front end of the first sleeve 2 against the outer periphery of the drill bit 5 through the wedge block 6.

[0014] This patent application does not alter the existing structure of the drill chuck 1. A first sleeve 2 is fitted around the outer periphery of the drill bit 5. One end of the first sleeve 2 has several first slots 3, and the other end has a second slot 4. The end piece of the first sleeve 2 and the end of the drill bit 5 are clamped together by several jaws 12. The front end of the drill bit 5 extends from the first sleeve 2 and contacts the grinding disc for grinding. A fixing tube 8 is fixedly connected to the outer surface of the middle part of the first sleeve 2; the outer surface of the fixing tube 8 has external threads, and a second sleeve 9 is screwed onto these threads. By rotating the second sleeve 9, it advances along the central axis of the first sleeve 2 until the inner wall of the front end of the second sleeve 9 presses the end piece of the first sleeve 2 against the outer periphery of the drill bit 5 through a wedge block 6. This provides support for the front section of the drill bit 5, clamping the front section of the first sleeve 2 onto the front section of the drill bit 5, and fixing them together. This enhances the strength of the drill bit 5 and prevents it from breaking due to vibration.

[0015] After the second sleeve 9 locks the drill bit 5 through the front section of the first sleeve 2, to prevent the second sleeve 9 from loosening on its own, the present invention further includes a threaded hole 10 at the end of the second sleeve 9, in which a bolt 11 is screwed. The bolt 11 is inserted into any one of the first slots 3. In use, firstly, the end of the bolt 11 is screwed into the threaded hole 10. By turning the bolt 11, the second sleeve 9 can be driven to rotate on the fixed tube 8. Then, the bolt 11 is rotated until it is inserted into the first slot 3, which prevents the second sleeve 9 from rotating on the fixed tube 8, thus preventing loosening.

[0016] Because there is friction between the front end of the second sleeve 9 and the wedge block 6, it is difficult to rotate the second sleeve 9. The present invention is further configured such that: a bearing 13 is fixedly connected to the front end of the second sleeve 9. The bearing 13 includes an outer ring 14, a plurality of balls 15, a rotating frame 16 and an inner ring. The outer ring 14 is fixedly connected to the second sleeve 9. A second groove 18 is provided on the inner wall of the outer ring 14. The plurality of balls 15 are disposed between the outer ring 14 and the inner ring and are located in the second groove 18. The rotating frame 16 is disposed on the plurality of balls 15.

[0017] Bearing 13 reduces the friction between the second sleeve 9 and the wedge block 6. In use, the inner ring pushes along the central axis of the first sleeve 2, starting its movement from the middle of the first sleeve 2. When the inner ring abuts against the wedge block 6, the spring clip of the first sleeve 2 bends, and the diameter of the front end of the first sleeve 2 decreases until the inner ring is fitted onto the wedge block 6. During this process, the diameter of the inner ring remains unchanged.

[0018] Example 2: See Appendix Figure 1-5 As shown, Embodiment 2 is basically the same as Embodiment 1, except that: the inner ring is replaced by the middle part of the first sleeve 2 and the wedge block 6, and a first groove 17 is provided on the middle part of the first sleeve 2 and the wedge block 6; a plurality of balls 15 are located in the first groove 17 and the second groove 18. The plane where the first groove 17 is located is perpendicular to the plane where the second groove 18 is located. The balls 15 always roll in the second groove 18, while simultaneously rolling in the first groove 17. Embodiment 2 further reduces friction. It can reduce the friction of the second sleeve 9 in circumferential motion, and also reduce the friction of the second sleeve 9 in motion along its own central axis. To avoid scratches, the present invention is further configured such that: the side of the wedge block 6 facing the outer ring 14 is an arc surface.

[0019] The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable those skilled in the art to understand the content of the present invention and implement it. They should not be used to limit the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A double-stage locking and holding type drill bit grinding machine anti-broken needle mechanism, comprising a drill chuck (1), the drill chuck (1) having a plurality of jaws (12); a first sleeve (2) is held in the jaws (12), a drill bit (5) is inserted into the first sleeve (2), the end of the drill bit (5) is flush with the end of the first sleeve (2), and the other end extends out of the first sleeve (2); a plurality of first slots (3) are provided at one end of the first sleeve (2), and a second slot (4) is provided at the other end. A fixed tube (8) is fixedly connected to the outer surface of the middle part; the first slot (3) and the second slot (4) divide the end of the first sleeve (2) into several spring pieces, and a wedge block (6) is fixedly connected to the spring piece at the front end of the first sleeve (2); the outer surface of the fixed tube (8) is provided with an external thread, and a second sleeve (9) is screwed onto the external thread; the inner wall of the front end of the second sleeve (9) presses the spring piece at the front end of the first sleeve (2) onto the outer periphery of the drill bit (5) through the wedge block (6); The end of the second sleeve (9) is provided with a threaded hole (10), and a bolt (11) is screwed into the threaded hole (10). The bolt (11) is inserted into any one of the first slots (3). Its features are, The front end of the second sleeve (9) is fixedly connected to a bearing (13). The bearing (13) includes an outer ring (14), a number of balls (15), a rotating frame (16), and an inner ring. The outer ring (14) is fixedly connected to the second sleeve (9). A second groove (18) is provided on the inner wall of the outer ring (14). The number of balls (15) is disposed between the outer ring (14) and the inner ring and is located in the second groove (18). The rotating frame (16) is disposed on the number of balls (15). The inner ring is replaced by the middle part of the first sleeve (2) and the wedge block (6), and the middle part of the first sleeve (2) and the wedge block (6) are provided with a first groove (17); a plurality of balls (15) are located in the first groove (17) and the second groove (18).

2. The anti-breakage mechanism for the dual-stage locking and holding drill bit grinding machine according to claim 1, characterized in that, The plane containing the first groove (17) is perpendicular to the plane containing the second groove (18).

3. The anti-breakage mechanism for the dual-stage locking and holding drill bit grinding machine according to claim 2, characterized in that, The side of the wedge block (6) facing the outer ring (14) is an arc surface.

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