Convenient-to-disassemble drill bit for hardware machining drilling machine

Abstract

The invention discloses a convenient-to-disassemble drill bit for a hardware machining drilling machine, and belongs to the technical field of drill bits, the convenient-to-disassemble drill bit for the hardware machining drilling machine comprises a drill bit and an adapter, the adapter comprises a cylindrical part, a sliding sleeve, an expansion sleeve and a raised line, and a clamping groove for clamping the raised line is formed in the hole wall of a clamping hole. Two deformation grooves penetrating through the clamping hole are formed in the periphery of the expansion sleeve, the outer diameter of the expansion sleeve is gradually increased in the direction away from the sliding sleeve, and a conical groove allowing the expansion sleeve to be clamped is formed in the end of the cylindrical part; and a driving assembly. The raised lines of the drill bit are clamped in the clamping grooves of the clamping holes, and when the expansion sleeve retracts into the conical grooves, the expansion sleeve generates elastic contraction, so that the hole wall of the clamping holes clamps the drill bit, the surface of the drill bit is in surface contact with the hole wall of the clamping holes, and due to the fact that the raised lines are clamped in the clamping grooves of the limiting grooves, when the drill bit cuts the hardware subjected to heat treatment, the drill bit is not prone to falling off. The drill bit and the hole wall of the clamping hole cannot slip and rotate, and the clamping force on the drill bit is large.

Description

Technical Field

[0001] The invention belongs to the technical field of drill bits, and in particular relates to a drill bit for a hardware processing drilling machine which is convenient to disassemble. Background Art

[0002] When drilling holes in hardware, drilling equipment is needed to perform the drilling operation. When drilling, the drill bit cuts the workpiece to complete the drilling. Currently, the drill bit is mainly installed on the spindle of the drilling equipment through a drill chuck, such as Fig.11 As shown, the existing drill chuck 1a relies on three clamping jaws 1c to clamp the drill bit. When clamping the drill bit, the staff inserts a key into the rotating hole of the drill chuck 1a, and drives the teeth 1b on the drill chuck 1a to rotate, thereby making the three clamping jaws 1c move closer to each other to clamp the drill bit;

[0003] When the three jaws 1c of the drill chuck 1a clamp the drill bit, the friction between the jaws 1c and the periphery of the drill bit is mainly used to prevent the drill bit from rotating during cutting. However, the jaws 1c and the periphery of the drill bit are not in surface contact but in line contact, so the clamping area is small. When the drill bit cuts the hardware after heat treatment, the cutting resistance of the drill bit is large, which easily causes the rotation rate of the drill bit to be mismatched with the rotation rate of the drilling equipment, thereby causing the periphery of the drill bit and the jaws 1c to slip. Over time, it is easy to cause greater wear on the periphery of the drill bit, and the jaws 1c will also wear, so the drill bit will not be clamped tightly, and even the drill bit will break during cutting.

[0004] In addition, there is another method for fixing the drill bit in the prior art, that is, using an elastic collet to fix the drill bit. When fixing the drill bit, this structure has a surface contact with the drill bit. Compared with the clamping method of the drill chuck 1a, the clamping force of the drill bit is improved. However, when clamping the drill bit, a special tool is required to lock the elastic collet. If a special tool cannot be found to lock it, it will take a long time. In addition, since the surface of the elastic collet is often chrome-plated, the friction coefficient with the periphery of the drill bit is small, which will also cause the drill bit to slip and turn due to the large cutting resistance when cutting heat-treated hardware. In addition, if the elastic collet is used for a long time, its elastic expansion and contraction ability will be greatly reduced, resulting in the inability to install the drill bit into the elastic collet.

[0005] Based on the defects of the above two drill bit clamping methods, the present application proposes a drill bit device that is easy to clamp and reduces slippage and rotation. Summary of the invention

[0006] The technical problem to be solved by the present invention is to overcome the disadvantages of the above-mentioned prior art and provide a drill bit for a hardware processing drilling machine which is easy to disassemble.

[0007] The technical solution adopted to solve the above technical problems is: a drill bit for a hardware processing drilling machine that is easy to disassemble, including a drill bit and an adapter, wherein the adapter includes:

[0008] A cylindrical portion with a connecting column coaxially fixedly connected to the top, and an installation cavity is formed on the end of the cylindrical portion away from the connecting column;

[0009] A sliding sleeve slidably engaged in the installation cavity, an expansion sleeve is coaxially fixedly connected to the end of the sliding sleeve, a clamping hole extending into the sliding sleeve is provided on the end surface of the expansion sleeve, the drill bit is telescopically installed in the clamping hole, and a convex strip is fixedly connected to the periphery of the drill bit, a clamping groove for the convex strip to be engaged is provided on the hole wall of the clamping hole, two deformation grooves penetrating through the clamping hole are provided on the periphery of the expansion sleeve, the outer diameter of the expansion sleeve increases successively in the direction away from the sliding sleeve, and a tapered groove for the expansion sleeve to be engaged is provided at the end of the columnar portion;

[0010] A driving assembly is arranged on the columnar portion, and the driving assembly is used to drive the expansion sleeve to slide in the tapered groove so that the clamping hole clamps the drill bit.

[0011] Through the above technical solution, the convex strip of the drill bit is engaged in the groove of the clamping hole. When the expansion sleeve is retracted into the conical groove, the expansion sleeve will produce elastic contraction, so that the hole wall of the clamping hole clamps the drill bit. The surface of the drill bit and the hole wall of the clamping hole are in surface contact. In addition, since the convex strip is engaged in the limiting groove, when the drill bit is cutting hardware after heat treatment, the drill bit and the hole wall of the clamping hole will not slip and rotate, and the clamping force on the drill bit is relatively large.

[0012] Furthermore, three abutment surfaces are formed on the periphery of the connecting column, and the three abutment surfaces are arranged in an axial array along the connecting column.

[0013] Through the above technical solution, the three abutting surfaces abut against the three clamping jaws of the external drill chuck, and the abutting surfaces and the three clamping jaws are not easy to slide relative to each other.

[0014] Furthermore, the drive assembly includes a connecting portion integrally formed and fixedly connected to the periphery of the cylindrical portion, a through groove being provided on the side wall of the connecting portion, a worm wheel being clamped and installed in the through groove, the worm wheel being able to rotate freely in the through groove, a accommodating cavity in the form of a through hole being provided on the side wall of the connecting portion, a worm being rotatably inserted in the accommodating cavity, the worm being meshed with the worm wheel, a spline hole being coaxially provided on the end face of the worm wheel for the sliding sleeve to pass freely, the hole wall of the spline hole being spline-connected to the periphery of the sliding sleeve, the periphery of the sliding sleeve being provided with an external threaded portion, the external threaded portion being threadedly connected to the mounting cavity wall of the cylindrical portion.

[0015] Through the above technical scheme, the worm is rotated, the worm is meshed with the worm wheel, the worm wheel rotates and drives the sliding sleeve to rotate, so that the external threaded portion on the sliding sleeve is screwed with the inner wall thread of the installation cavity of the cylindrical portion, and then the sliding sleeve drives the expansion sleeve to slide in the direction of retracting into the inner side of the cylindrical portion, so that the expansion sleeve and the inner wall of the tapered groove slide relative to each other, and then the expansion sleeve is squeezed by the inner wall of the tapered groove, so that the expansion sleeve elastically contracts, and then the hole wall of the clamping hole clamps the drill bit. Since the meshing of the worm wheel and the worm is self-locking, after the drill bit is clamped, the worm wheel will not rotate by itself to cause the drill bit to become loose after clamping.

[0016] Furthermore, a retaining spring is installed at each axial end of the worm, and the two retaining springs abut against the outer walls on both sides of the connecting portion respectively.

[0017] Through the above technical solution, the retaining spring limits the worm axially, and the worm can rotate in the accommodating cavity, so that the worm is rotatably connected to the connecting part.

[0018] Furthermore, a limit pin is vertically penetrated through the upper end surface of the columnar portion, and an annular groove for the end of the limit pin to engage is opened on the end surface of the worm wheel, and the limit pin slides freely in the annular groove.

[0019] Through the above technical solution, the limiting pin slides in the annular groove, and the worm wheel is rotatably mounted on the periphery of the sliding sleeve, so that the worm wheel is rotatably connected in the through groove and will not loosen.

[0020] Furthermore, the width of the convex strip is not less than half of the radius of the drill bit.

[0021] Through the above technical solution, the convex strip has greater mechanical strength and is not easy to separate from the drill bit and break.

[0022] Furthermore, the sliding sleeve is provided with a fracture detection member, and the fracture detection member is used to detect whether the convex strip is broken from the drill bit.

[0023] Through the above technical solution, the fracture detection member detects whether the convex strip is broken and detached from the drill bit, so that a new drill bit can be replaced in time to avoid the drill bit being broken due to failure to replace the drill bit in time.

[0024] Furthermore, the fracture detection component includes a rotating part rotatably connected to one end of the sliding sleeve adjacent to the connecting column, the end surface of the sliding sleeve is provided with an air avoidance groove for the rotating part to pass freely, the air avoidance groove is communicated with the clamping hole, the end of the drill bit abuts against the end of the rotating part, the end surface of the sliding sleeve is provided with a sliding hole in the form of a blind hole, a sliding block is clamped and installed in the sliding hole, the sliding block slides freely in the sliding hole, a soft shaft is fixedly connected to one end surface of the sliding block facing the expansion sleeve, the sliding sleeve and The expansion sleeve is provided with a flexible shaft through hole for the flexible shaft to pass freely, the flexible shaft through hole is connected with the sliding hole, a short pin is fixedly connected to the surface of the sliding block, a waist-shaped hole is provided in the sliding sleeve for the short pin to move freely up and down, a special-shaped slide groove is provided on the periphery of the rotating part for the short pin to be inserted, the special-shaped slide groove includes two inclined grooves, the upper ends of the two inclined grooves in the inclined direction are connected and form a positioning groove, when the end of the short pin is engaged in the positioning groove, the lower end surface of the flexible shaft is flush with the lower end surface of the expansion sleeve.

[0025] Through the above technical scheme, when the convex strip is broken, the cutting resistance encountered by the drill bit is large when cutting the hardware after heat treatment, and the drill bit will slip in the clamping hole. The end of the drill bit is pressed against the rotating part, so that when the drill bit slips in the clamping hole, the drill bit will rotate relative to the expansion sleeve, and then the end face of the drill bit will drive the rotating part to rotate. When the rotating part rotates, the short pin will slide from the positioning groove to the inclined groove, and then the short pin will drive the sliding block to move downward, so that the end of the flexible shaft is exposed to the outside of the lower end face of the expansion sleeve. In this way, the staff can determine whether the drill bit is slipping by observing the end of the flexible shaft exposed to the lower end face of the expansion sleeve, so as to facilitate timely replacement of a new drill bit.

[0026] Furthermore, the end surface of the rotating part is provided with knurling, and the knurling abuts against the end surface of the drill bit.

[0027] Through the above technical solution, when the knurling abuts against the end face of the drill bit, the friction between the rotating part and the end face of the drill bit is increased.

[0028] Furthermore, a return spring is vertically installed in the sliding hole, and the return spring elastically presses upward against the end surface of the sliding block.

[0029] Through the above technical solution, when the rotating block moves downward, it will compress the reset spring, and the reset spring will accumulate elastic potential energy. When a new drill bit is replaced, the elastic potential energy accumulated in the reset spring is released, and drives the sliding block to reset, thereby causing the short pin to slide in the inclined groove toward the direction of the positioning groove, and enabling the rotating part to rotate in the opposite direction, so that the flexible shaft is retracted into the flexible shaft through-hole.

[0030] The beneficial effects of the present invention are as follows:

[0031] (1) In the present invention, the convex strip of the drill bit is engaged in the groove of the clamping hole. When the expansion sleeve is retracted into the conical groove, the expansion sleeve will produce elastic contraction, so that the hole wall of the clamping hole clamps the drill bit. The surface of the drill bit and the hole wall of the clamping hole are in surface contact. In addition, because the convex strip is engaged in the groove of the limit groove, when the drill bit cuts the hardware after heat treatment, the drill bit and the hole wall of the clamping hole will not slip and rotate, and the clamping force on the drill bit is relatively large.

[0032] (2) In the present invention, the worm is rotated, the worm is meshed with the worm wheel, the worm wheel rotates and drives the sliding sleeve to rotate, so that the external threaded portion on the sliding sleeve is screwed with the inner wall of the installation cavity of the cylindrical portion, and then the sliding sleeve drives the expansion sleeve to slide in the direction of being retracted into the inner side of the cylindrical portion, so that the expansion sleeve and the inner wall of the tapered groove slide relative to each other, and then the expansion sleeve is squeezed by the inner wall of the tapered groove, so that the expansion sleeve elastically contracts, and then the hole wall of the clamping hole clamps the drill bit. Since the meshing of the worm wheel and the worm is self-locking, after the drill bit is clamped, the worm wheel will not rotate by itself, causing the drill bit to become loose after being clamped;

[0033] (3) In the present invention, when the convex strip is broken, the cutting resistance of the drill bit is large when cutting the hardware after heat treatment, and the drill bit will slip in the clamping hole. The end of the drill bit presses against the rotating part, so that when the drill bit slips in the clamping hole, the drill bit will rotate relative to the expansion sleeve, and then the end face of the drill bit drives the rotating part to rotate. When the rotating part rotates, the short pin will slide from the positioning groove to the inclined groove, and then the short pin will drive the sliding block to move downward, so that the end of the flexible shaft is exposed to the outside of the lower end face of the expansion sleeve. In this way, the staff can determine whether the drill bit is slipping by observing the end of the flexible shaft exposed to the lower end face of the expansion sleeve, so as to facilitate timely replacement of a new drill bit. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the overall structure of a drill bit for a hardware processing drilling machine that is easy to disassemble in the present invention;

[0035] Figure 2 yes Figure 1 A schematic diagram of the structure from another perspective;

[0036] Figure 3 yes Figure 1 Schematic diagram of the explosion decomposition of the structure;

[0037] Figure 4 yes Figure 1 Schematic diagram of the positional relationship of the cutaway structure in the middle part;

[0038] Figure 5 yes Figure 1 The schematic diagram of the structure after omitting the cylindrical part;

[0039] Figure 6 yes Figure 5Schematic diagram of the explosion decomposition of the structure;

[0040] Figure 7 yes Figure 5 The schematic diagram of the positional relationship of the worm wheel and the worm shaft after the worm gear is omitted;

[0041] Figure 8 yes Figure 7 A magnified schematic diagram of the local structure at point A;

[0042] Fig. 9 is a schematic cross-sectional structural diagram of the columnar portion of the present invention;

[0043] Fig.10 It is a structural schematic diagram of the rotating part in the present invention;

[0044] Fig.11 It is a structural schematic diagram of a drill chuck in the prior art;.

[0045] : 1. drill bit; 2. cylindrical part; 3. worm gear; 4. connecting part; 5. abutment surface; 6. connecting column; 7. retaining spring; 8. worm; 9. expansion sleeve; 10. deformation groove; 11. convex strip; 12. flexible shaft; 13. sliding sleeve; 14. accommodating chamber; 15. fixing plate; 16. external threaded part; 17. limit pin; 18. annular groove; 19. connecting screw; 20. mounting groove; 21. air avoidance groove; 22. reset spring; 23. rotating part; 24. bearing; 25. inclined groove; 26. clamping hole; 27. pad; 28. sliding hole; 29. ​​sliding block; 30. tapered groove; 31. positioning groove; 32. knurling; 33. short pin. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0047] like Figure 1-Figure 10 As shown, this embodiment provides a drill bit for a metal processing drilling machine that is easy to disassemble, including a drill bit 1 and an adapter, the adapter including a columnar portion 2, a connecting column 6 is coaxially fixedly connected to the top of the columnar portion 2, and three abutment surfaces 5 are arranged along the axial array of the peripheral edge of the connecting column 6, the connecting column 6 is inserted between the three clamping jaws of the external drill joint, and then the three abutment surfaces 5 are clamped respectively by the three clamping jaws, and then the connecting column 6 is clamped on the drill chuck, and a mounting cavity is arranged on the end of the columnar portion 2 away from the connecting column 6;

[0048] Combination Figures 1 to 9As shown, a sliding sleeve 13 is slidably mounted in the mounting cavity, an expansion sleeve 9 is coaxially fixedly connected to the end of the sliding sleeve 13, a clamping hole 26 extending into the sliding sleeve 13 is provided on the end surface of the expansion sleeve 9, a drill bit 1 is telescopically mounted in the clamping hole 26, and a convex strip 11 is fixedly connected to the periphery of the drill bit 1, a slot for the convex strip 11 to engage is provided on the wall of the clamping hole 26, the width of the convex strip 11 is not less than half of the radius of the drill bit 1, and two through-mounting holes are provided on the periphery of the expansion sleeve 9. The deformation groove 10 of the clamping hole 26 and the outer diameter of the expansion sleeve 9 increase in sequence in the direction away from the sliding sleeve 13. The end of the columnar portion 2 is provided with a tapered groove 30 for the expansion sleeve 9 to engage. When the expansion sleeve 9 slides in the tapered groove 30 toward the sliding sleeve 13, the tapered edge of the expansion sleeve 9 will be squeezed by the inner wall of the tapered groove 30. Since the deformation groove 10 is provided on the outer wall of the expansion sleeve 9, the expansion sleeve 9 will produce elastic contraction deformation along the radial inner side thereof, thereby causing the hole wall of the clamping hole 26 to clamp the drill bit 1.

[0049] Combination Figures 1 to 9 As shown, the periphery of the cylindrical portion 2 is integrally fixed with a connecting portion 4, a through groove is provided on the side wall of the connecting portion 4, a worm wheel 3 is clamped and installed in the through groove, and the worm wheel 3 rotates freely in the through groove. Specifically, a limit pin 17 is vertically penetrated through the upper end surface of the cylindrical portion 2, and an annular groove 18 for the end of the limit pin 17 to be clamped is provided on the end surface of the worm wheel 3. The limit pin 17 slides freely in the annular groove 18, and the limit pin 17 slides in the annular groove 18, and the worm wheel 3 is rotatably sleeved on the sliding The worm gear 3 is rotatably connected to the through groove on the periphery of the movable sleeve 13 and will not loosen. The side wall of the connecting portion 4 is also provided with a through hole-shaped accommodating cavity 14, in which a worm 8 is rotatably inserted. Specifically, a retaining spring 7 is installed at each axial end of the worm 8, and the two retaining springs 7 respectively abut against the outer walls of both sides of the connecting portion 4. The retaining spring 7 limits the axial position of the worm 8, and the worm 8 can rotate in the accommodating cavity 14, thereby making the worm 8 rotatably connected to the connecting portion 4. 8 meshes with the worm wheel 3. The end face of the worm wheel 3 is coaxially provided with a spline hole for the sliding sleeve 13 to pass freely. The hole wall of the spline hole is spline-connected with the periphery of the sliding sleeve 13. The periphery of the sliding sleeve 13 is provided with an external threaded portion 16. The external threaded portion 16 is threadedly connected with the installation cavity wall of the columnar portion 2. One end of the worm 8 is provided with a hexagonal tool socket. An external hexagonal tool is inserted into the hexagonal tool socket and can rotate the worm 8. When the worm 8 rotates, the worm 8 and the worm are driven to rotate. The wheel 3 meshes and rotates, thereby causing the worm wheel 3 to rotate. The spline hole of the worm wheel 3 is spline-connected with the periphery of the sliding sleeve 13, so the worm wheel 3 will drive the sliding sleeve 13 to rotate. At the same time, the sliding sleeve 13 can freely slide up and down in the spline hole. The external threaded portion 16 on the sliding sleeve 13 is threadedly engaged with the inner wall of the installation cavity of the cylindrical portion 2, so that when the sliding sleeve 13 rotates with the worm wheel 3, it will synchronously move along the axial direction of the cylindrical portion 2, thereby causing the expansion sleeve 9 to slide in the tapered groove 30;

[0050] Combination Figures 1 to 10As shown, the sliding sleeve 13 is rotatably connected to a rotating part 23 at one end adjacent to the connecting column 6, and an air-avoiding groove 21 is provided on the end surface of the sliding sleeve 13 for the rotating part 23 to freely pass through, and the air-avoiding groove 21 is communicated with the clamping hole 26. A mounting groove 20 is provided on the end surface of the sliding sleeve 13, and a fixing plate 15 is screw-connected and installed in the mounting groove 20. A ring-shaped cushion block 27 is fixedly connected to the side of the fixing plate 15 facing the air-avoiding groove 21, and a bearing mounting part is coaxially fixedly connected to the upper end of the rotating part 23, and a bearing 24 is sleeved on the bearing mounting part. The bearing 24 The outer ring is engaged with the inner wall of the air avoidance groove 21, the cushion block 27 is against the outer ring end face of the bearing 24, the bearing mounting portion is threadedly connected with a connecting screw 19, and the surface of the fixing plate 15 is provided with a screw hole for the connecting screw 19 to pass freely, so that the rotating part 23 is rotatably connected in the air avoidance groove 21, the end of the drill bit 1 is in contact with the end of the rotating part 23, and the end face of the sliding sleeve 13 is provided with a blind hole sliding hole 28, and a sliding block 29 is engaged and installed in the sliding hole 28, and the sliding block 29 slides freely in the sliding hole 28. A flexible shaft 12 is fixedly connected to one end face of the expansion sleeve 9, and a flexible shaft through hole for the flexible shaft 12 to pass freely is provided on the sliding sleeve 13 and the expansion sleeve 9, and the flexible shaft through hole is connected to the sliding hole 28. A short pin 33 is fixedly connected to the surface of the sliding block 29, and a waist-shaped hole for the short pin 33 to move freely up and down is provided in the sliding sleeve 13. A special-shaped slide groove for the short pin 33 to be inserted is provided on the periphery of the rotating part 23. The special-shaped slide groove includes two inclined grooves 25, and the upper ends of the two inclined grooves 25 in the inclined direction are connected and form a positioning groove 31. The end of the short pin 33 is engaged in When in the positioning groove 31, the lower end face of the flexible shaft 12 is flush with the lower end face of the expansion sleeve 9. The purpose of setting the flexible shaft 12 is that when the expansion sleeve 9 elastically contracts and expands, the flexible shaft perforation may also present a certain curved shape, and the flexible shaft itself has a certain bending deformation ability, so the flexible shaft 12 can slide in the flexible shaft perforation, and the end face of the rotating part 23 is provided with a knurl 32, and the knurl 32 abuts against the end face of the drill bit 1, and a return spring 22 is vertically installed in the sliding hole 28, and the return spring 22 elastically abuts against the end face of the sliding block 29 upward.

[0051] The working principle of this embodiment is as follows:

[0052] When clamping the drill bit 1, the drill bit 1 is inserted into the clamping hole 26 of the expansion sleeve 9, and the convex strips 11 on both sides of the drill bit 1 are respectively engaged in the card grooves, and then a hexagonal tool is used to insert it into the hexagonal tool socket of the worm 8, and the worm 8 can be rotated. When the worm 8 rotates, the worm 8 and the worm wheel 3 are driven to mesh and rotate, thereby rotating the worm wheel 3. The spline hole of the worm wheel 3 is spline-connected with the periphery of the sliding sleeve 13, so the worm wheel 3 will drive the sliding sleeve 13 to rotate, and the sliding sleeve 13 can slide freely up and down in the spline hole. The external threaded portion 16 on the sliding sleeve 13 is threadedly engaged with the inner wall of the mounting cavity of the cylindrical portion 2, so that the sliding sleeve 13 rotates with the worm wheel 3. When the expansion sleeve 9 slides in the conical groove 30 toward the sliding sleeve 13, the conical edge of the expansion sleeve 9 will be squeezed by the inner wall of the conical groove 30. Since the outer wall of the expansion sleeve 9 is provided with a deformation groove 10, the expansion sleeve 9 will produce elastic contraction deformation along the radial inner side thereof, so that the hole wall of the clamping hole 26 clamps the drill bit 1. At this time, the connection between the drill bit 1 and the drill chuck of the drilling equipment is completed, and the drilling operation can be carried out. During the drilling operation, the peripheral edge of the drill bit 1 is in surface contact with the clamping hole 26, and the convex strip 11 is engaged in the clamping groove, so that the drill bit 1 is not easy to slip and rotate in the clamping hole 26.

[0053] Since the convex strip 11 is fixedly connected to the drill bit 1, after long-term use, the convex strip 11 may break from the drill bit 1. After the convex strip 11 breaks, the drill bit 1 may slip and rotate in the clamping hole 26 when the cutting resistance is large. When cutting, the drill bit 1 slips and rotates in the clamping hole 26, and the end face of the drill bit 1 will drive the rotating part 23 to rotate through the friction resistance. When the rotating part 23 rotates, the short pin 33 will slide in the special-shaped sliding groove, that is, the short pin 33 will slide from the positioning groove 31 to the inclined groove 25, so that the short pin 33 drives the sliding block 29 to slide downward. When the sliding block 29 slides downward, it will drive the flexible shaft 12 to move in the flexible shaft perforation toward the outer side of the lower end face of the expansion sleeve 9, so that the end of the flexible shaft 12 is exposed from the lower end face of the expansion sleeve 9, so that the staff can It is possible to timely replace a new drill bit 1 according to the exposure of the lower end surface of the expansion sleeve 9 by the flexible shaft 12, so as to prevent the drill bit 1 with a broken convex strip 11 from breaking during cutting due to the slipping of the drill bit 1. When replacing a new drill bit 1, the worm 8 is rotated in the opposite direction to make the worm wheel 3 rotate in the opposite direction, thereby making the expansion sleeve 9 move downward, so that the broken convex strip 11 falls out of the slot, and the old drill bit 1 is removed at the same time. When the old drill bit 1 is removed, the elastic potential energy accumulated by the reset spring 22 in the previous downward movement of the sliding block 29 will be released, so that the sliding block 29 moves upward, so that the short pin 33 slides in the special-shaped slide groove, and the short pin 33 slides from the inclined groove 25 to the positioning groove 31. When sliding, the rotating part 23 will be driven to rotate in the opposite direction, thereby making the rotating part 23 rotate to the initial state.

[0054] The above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention.

Claims

1. A drill bit for a metal processing drilling machine that is easy to disassemble, comprising a drill bit (1), characterized in that: Also included is a transition piece, the transition piece comprising: A columnar portion (2) is coaxially fixedly connected to a connecting column (6) at the top, and a mounting cavity is formed at one end of the columnar portion (2) away from the connecting column (6); A sliding sleeve (13) is slidably engaged in the installation cavity, an expansion sleeve (9) is coaxially fixedly connected to the end of the sliding sleeve (13), a clamping hole (26) extending into the sliding sleeve (13) is provided on the end surface of the expansion sleeve (9), the drill bit (1) is telescopically installed in the clamping hole (26), a convex strip (11) is fixedly connected to the periphery of the drill bit (1), a groove for engaging the convex strip (11) is provided on the hole wall of the clamping hole (26), two deformation grooves (10) penetrating the clamping hole (26) are provided on the periphery of the expansion sleeve (9), the outer diameter of the expansion sleeve (9) increases in sequence in the direction away from the sliding sleeve (13), and a tapered groove (30) for engaging the expansion sleeve (9) is provided at the end of the columnar portion (2); A driving assembly is arranged on the columnar portion (2), and is used to drive the expansion sleeve (9) to slide in the conical groove (30) so that the clamping hole (26) clamps the drill bit (1).

2. The easily disassembled drill bit for a hardware processing drilling machine according to claim 1 is characterized in that: The circumference of the connecting column (6) is provided with three abutment surfaces (5), and the three abutment surfaces (5) are arranged in an axial array along the connecting column (6).

3. The easily disassembled drill bit for a hardware processing drilling machine according to claim 1, characterized in that: The drive assembly comprises a connecting portion (4) integrally formed and fixed to the periphery of the cylindrical portion (2); a through groove is provided on the side wall of the connecting portion (4); a worm wheel (3) is mounted in the through groove; the worm wheel (3) rotates freely in the through groove; a through hole-shaped accommodating cavity (14) is provided on the side wall of the connecting portion (4); a worm (8) is rotatably inserted in the accommodating cavity (14); the worm (8) is meshed with the worm wheel (3); a spline hole is coaxially provided on the end face of the worm wheel (3) for the sliding sleeve (13) to pass freely; the hole wall of the spline hole is spline-connected to the periphery of the sliding sleeve (13); an external threaded portion (16) is provided on the periphery of the sliding sleeve (13); the external threaded portion (16) is threadedly connected to the wall of the mounting cavity of the cylindrical portion (2).

4. The easily disassembled drill bit for a hardware processing drilling machine according to claim 3 is characterized in that: A retaining spring (7) is installed at each axial end of the worm (8), and the two retaining springs (7) respectively abut against the outer walls on both sides of the connecting portion (4).

5. The easily disassembled drill bit for a hardware processing drilling machine according to claim 3 is characterized in that: A limit pin (17) is vertically penetrated through the upper end surface of the columnar portion (2), and an annular groove (18) is provided on the end surface of the worm wheel (3) for the end of the limit pin (17) to engage, and the limit pin (17) slides freely in the annular groove (18).

6. The easily disassembled drill bit for a hardware processing drilling machine according to claim 1, characterized in that: The width of the convex strip (11) is not less than half the radius of the drill bit (1).

7. The easily disassembled drill bit for a hardware processing drilling machine according to claim 1, characterized in that: The sliding sleeve (13) is provided with a fracture detection member, and the fracture detection member is used to detect whether the convex strip (11) is broken from the drill bit (1).

8. The easily disassembled drill bit for a hardware processing drilling machine according to claim 7, characterized in that: The fracture detection component comprises a rotating part (23) rotatably connected to one end of the sliding sleeve (13) adjacent to the connecting column (6); the end surface of the sliding sleeve (13) is provided with a clearance groove (21) for the rotating part (23) to pass freely; the clearance groove (21) is communicated with the clamping hole (26); the end of the drill bit (1) abuts against the end of the rotating part (23); the end surface of the sliding sleeve (13) is provided with a blind hole-shaped sliding hole (28); a sliding block (29) is snap-fitted and installed in the sliding hole (28); the sliding block (29) slides freely in the sliding hole (28); a flexible shaft (12) is fixedly connected to one end surface of the sliding block (29) facing the expansion sleeve (9); the sliding sleeve (13) and the expansion sleeve (9) are provided with a flexible shaft through hole for the flexible shaft (12) to pass freely, the flexible shaft through hole is connected to the sliding hole (28), a short pin (33) is fixedly connected to the surface of the sliding block (29), a waist-shaped hole is provided in the sliding sleeve (13) for the short pin (33) to move freely up and down, and a special-shaped slide groove is provided on the periphery of the rotating part (23) for the short pin (33) to be inserted, the special-shaped slide groove includes two inclined grooves (25), the upper ends of the two inclined grooves (25) are connected in the inclined direction and form a positioning groove (31), when the end of the short pin (33) is engaged in the positioning groove (31), the lower end surface of the flexible shaft (12) is flush with the lower end surface of the expansion sleeve (9).

9. The easily disassembled drill bit for a hardware processing drilling machine according to claim 8, characterized in that: The end surface of the rotating part (23) is provided with a knurl (32), and the knurl (32) abuts against the end surface of the drill bit (1).

10. The easily disassembled drill bit for a hardware processing drilling machine according to claim 8, characterized in that: A return spring (22) is vertically installed in the sliding hole (28), and the return spring (22) elastically presses upward against the end surface of the sliding block (29).

Images