Hollow high speed core drill

Abstract

The application provides a hollow high-speed hole drilling bit, which comprises a hollow drill bit, a drill handle and a telescopic drill assembly, the drill handle is arranged at one end of the hollow drill bit, the telescopic drill assembly is arranged on the inner side of the hollow drill bit, the telescopic drill assembly comprises a telescopic drill bit, connecting rods and an adjusting turntable, a plurality of connecting rods are arranged on one end of the telescopic drill bit, one end of each connecting rod penetrates through the end of the hollow drill bit, a plurality of accommodating grooves for accommodating one end of each connecting rod are formed in the side wall of the drill handle, one end of each connecting rod extends to the outer side of the hollow drill bit and is embedded into the accommodating groove, a guide block is arranged on the outer side of each connecting rod, a plurality of guide grooves for accommodating the guide blocks are formed in the inner wall of the hollow drill bit, a plurality of tooth blocks are arranged on the inner side of each connecting rod in an axial direction, the adjusting turntable is arranged on the inner side of each connecting rod, a helical convex strip which is engaged with the tooth blocks is arranged on the outer side wall of the adjusting turntable, and the adjusting turntable is rotationally arranged at one end of the hollow drill bit; the adjusting turntable is rotated by a tool, the connecting rods are driven to move under the cooperation of the helical convex strip and the tooth blocks, and the telescopic drill bit is extended out of the hollow drill bit or retracted into the hollow drill bit, so that the hole drilling bit can be suitable for drilling requirements of two diameter sizes, the size of the drilled hole can be quickly switched, the hole drilling bit does not need to be frequently installed and disassembled, and the hole drilling efficiency is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of hole opening tools, and particularly relates to a hollow high-speed hole opening drill bit. BACKGROUND

[0002] The center part of the hollow drill bit adopts a hollow structure design, can take away part of the material during drilling, and achieves a faster and more effective drilling effect. The hollow drill bit is mainly used for steel plate, steel material and stainless steel hole opening and core taking. The hollow drill bit has the characteristics of adopting a multi-blade ring-shaped cutting form, cutting only the outer diameter ring-shaped part of the hole by the drill bit, and not cutting the middle part, so that the resistance during drilling is reduced, and the hole opening efficiency is 3-5 times that of a twist drill. At the same time, due to the hollow structure design, the lubrication and coolant in the space can flow more fully, thereby reducing the possibility of damage to the drill bit and the workpiece and improving the drilling precision. The hollow drill bit in the prior art has various sizes, and different sizes of hollow drills need to be replaced when hole opening is performed for different hole diameter requirements.

[0003] Chinese patent document CN202022248442.1 discloses a glass drilling machine suitable for different hole diameters. In the application, drill bit a is internally provided with drill bit b, and drill bit c is internally provided in drill bit b. When drilling holes of different diameters, the outer drill bit is disassembled to meet the hole opening diameter size. Drill bit c inside still needs to cut the inner part during the drilling process. This hole opening method is not suitable for steel plates and steel materials, and will increase additional hole opening consumption. Moreover, when the drill bit is replaced, frequent disassembly and installation are relatively cumbersome. SUMMARY

[0004] The main purpose of the application is to provide a hollow high-speed hole opening drill bit, which solves the problem of single hole opening size of the hole opening drill bit in the prior art and cannot meet the hole opening requirements of hard materials of different hole diameters.

[0005] The specific technical solution is as follows:

[0006] The utility model provides a kind of hollow high-speed core drill bit, including hollow drill, drill handle and telescopic drill assembly, the hollow drill is cylindrical structure with axis, the drill handle is centrally arranged at one end of hollow drill, a plurality of external cutting parts are evenly distributed and arranged at the opening of the other end of hollow drill, and outer chip flute is arranged on the outer wall of hollow drill on the side of each cutting part;The inside of hollow drill is provided with the telescopic drill assembly, and the telescopic drill assembly includes telescopic drill, connecting rod and adjusting turntable, the telescopic drill is annular, and a plurality of internal cutting parts are evenly distributed and arranged on the one end of telescopic drill along the circumference, and the position of each internal cutting part corresponds to the position of external cutting part on hollow drill respectively;A plurality of connecting rods are evenly arranged on the other end of telescopic drill along the circumference respectively, and the connecting rod is arranged along the axis direction, one end of the connecting rod penetrates the end of hollow drill, and a plurality of accommodating grooves for accommodating one end of connecting rod are formed in the side wall of drill handle, so that one end of connecting rod extends to the outside of hollow drill and is embedded into accommodating groove;A plurality of guide blocks are arranged on the outside of a plurality of connecting rods, and a plurality of guide grooves for accommodating guide blocks are formed in the inner wall of hollow drill along the axial direction, so that guide block and guide groove cooperate to realize the guidance of telescopic drill;A plurality of tooth blocks are arranged on the inside of a plurality of connecting rods along the axial direction, and the inside of a plurality of connecting rods is provided with the adjusting turntable, the outer side wall of adjusting turntable is provided with helical convex strip engaged with the tooth block, so that adjusting turntable and each connecting rod are connected by the cooperation between helical convex strip and tooth block;Adjusting turntable is rotationally arranged at one end of hollow drill, and adjusting turntable is rotated by tool, and connecting rod is driven to move under the cooperation of helical convex strip and tooth block, so that telescopic drill is extended from hollow drill or retracted into hollow drill.

[0007] Further, the external cutting part and the internal cutting part each include a cutting block and a tool bit provided on the cutting block, the hollow drill and the telescopic drill each have an embedding groove for accommodating the cutting block, the inside or the outside of the end of each cutting block has the tool bit arranged through a groove, and the tool bit is located on the inside or the outside.

[0008] Further, the positions of the tool bits in the plurality of external cutting parts and internal cutting parts are symmetrically arranged.

[0009] Further, the outer wall of the telescopic drill is provided with an inner chip flute, the direction and position of the inner chip flute are adapted to the outer chip flute, and the side of the hollow drill and the telescopic drill located in the embedding groove is provided with a notched groove, and the position of the notched groove is located at one end of the outer chip flute and the inner chip flute respectively.

[0010] Further, the width of the connecting rod is adapted to the width of the accommodating groove, and the outside wall of the connecting rod is recessed on the surface of the side wall of the drill handle.

[0011] Further, the adjusting turntable is provided with a rotating shaft at one end of the center, the rotating shaft is rotatably arranged in the inner wall of one end of the hollow drill bit, and an adjusting hole for tool screwing is arranged at the other end of the center of the adjusting turntable.

[0012] Further, a rotating groove is arranged on the inner wall of one end of the hollow drill bit, a rotating seat is arranged in the rotating groove, and the rotating seat is sleeved on the outer side of the rotating shaft and is rotatably connected with the rotating shaft.

[0013] Further, the outer wall of the telescopic drill bit is arranged close to the inner wall of the hollow drill bit.

[0014] The beneficial effects of the present application are embodied in:

[0015] The hollow drill bit with the telescopic drill assembly is adopted, the adjusting turntable is screwed by a tool, and the extension and contraction of the telescopic drill bit inside are adjusted, so that the hole drilling bit can be suitable for the drilling requirements of two diameter sizes, the size of the drilling hole can be quickly switched, the drilling efficiency is improved, and the frequent installation and disassembly are not needed.

[0016] In the present application, the telescopic drill assembly is meshed with the tooth blocks on each connecting rod through the spiral convex stripes on the adjusting turntable, the telescopic function of the telescopic drill bit is realized by screwing the adjusting turntable by a tool, the overall structure is compact, the operation is simple, and the practicability is high. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a structural schematic view when the telescopic drill bit is retracted in the present application.

[0018] Figure 2 It is a structural schematic view when the telescopic drill bit is extended in the present application.

[0019] Figure 3 It is a sectional view when the telescopic drill bit is retracted in the present application.

[0020] Figure 4 It is a sectional view when the telescopic drill bit is extended in the present application.

[0021] Figure 5 It is a front view of the present application.

[0022] Marked: hollow drill bit 1, outer cutting part 10, cutting block 101, tool bit 102, embedded groove 103, recess groove 104, outer chip removal groove 11, notched groove 12, guide groove 13, rotating groove 14, rotating seat 15, drill handle 2, accommodating groove 21, telescopic drill bit 3, inner cutting part 30, inner chip removal groove 31, connecting rod 4, tooth block 41, guide block 42, adjusting turntable 5, spiral convex stripe 51, rotating shaft 52, adjusting hole 53. DETAILED DESCRIPTION

[0023] In order to make the technical solutions of the present application more clear and explicit, the present application will be further described below in combination with the drawings. Any solutions obtained by equivalent replacement and routine inference of the technical features of the technical solutions of the present application all fall within the protection scope of the present application. The fixed connection and fixed arrangement mentioned in the present application are general connection modes in the mechanical field, and welding, bolt and nut connection and screw connection are all possible.

[0024] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0025] Referring to the drawings Figures 1-5 The embodiment provides a hollow high-speed core drill bit, which comprises a hollow drill bit 1, a drill handle 2 and a telescopic drill assembly. The hollow drill bit 1 is a cylindrical structure with an axis. The drill handle 2 is arranged at the center of one end of the hollow drill bit 1. Four outer cutting parts 10 are uniformly arranged at the hole of the other end of the hollow drill bit 1. An outer chip groove 11 is arranged on one side of each cutting part on the outer wall of the hollow drill bit 1. The inner side of the hollow drill bit 1 is provided with the telescopic drill assembly. The telescopic drill assembly comprises a telescopic drill bit 3, a connecting rod 4 and an adjusting turntable 5. The telescopic drill bit 3 is in a circular ring shape, and the outer wall of the telescopic drill bit 3 is arranged close to the inner wall of the hollow drill bit 1. Four inner cutting parts 30 are uniformly arranged on one end of the telescopic drill bit 3 in a circumferential direction. The positions of the inner cutting parts 30 correspond to the positions of the outer cutting parts 10 on the hollow drill bit 1 respectively. A plurality of connecting rods 4 are uniformly arranged on the other end of the telescopic drill bit 3 in a circumferential direction. The connecting rods 4 are fixedly connected to the end face of the telescopic drill bit 3 by brazing. The connecting rods 4 are arranged along the axis direction. One end of the connecting rod 4 penetrates the end of the hollow drill bit 1. A plurality of accommodation grooves 21 for accommodating one end of the connecting rod 4 are arranged on the side wall of the drill handle 2, so that one end of the connecting rod 4 extends to the outside of the hollow drill bit 1 and is embedded into the accommodation groove 21.

[0026] The outer side of the plurality of connecting rods 4 is provided with a guide block 42, and the inner wall of the hollow drill bit 1 is provided with a plurality of guide grooves 13 arranged in the axial direction and used for accommodating the guide block 42, so that the guide block 42 cooperates with the guide groove 13 to guide the telescopic drill bit 3. The inner side of the plurality of connecting rods 4 is arranged in the axial direction and provided with a plurality of tooth blocks 41, and the inner side of the plurality of connecting rods 4 is provided with an adjusting turntable 5, and the outer side wall of the adjusting turntable 5 is provided with a spiral convex strip 51 engaged with the tooth blocks 41, so that the adjusting turntable 5 is in transmission connection with each connecting rod 4 through the cooperation between the spiral convex strip 51 and the tooth blocks 41; the adjusting turntable 5 is rotationally arranged at one end of the hollow drill bit 1, and the adjusting turntable 5 is rotated by a tool, and the connecting rod 4 is driven to move under the cooperation of the spiral convex strip 51 and the tooth blocks 41, and the telescopic drill bit 3 is extended out of or retracted into the hollow drill bit 1.

[0027] Due to the engagement structure between the spiral convex strip 51 and the tooth blocks 41, the telescopic drill bit 3 will not automatically retract into the hollow drill bit 1 when rotating the hole due to external force, and the cooperation between the guide block 42 and the guide groove 13 limits the rotation during the cutting process.

[0028] In the embodiment, the outer cutting part 10 and the inner cutting part 30 each include a cutting block 101 and a tool bit 102 arranged on the cutting block 101, one end of the hollow drill bit 1 and the telescopic drill bit 3 is provided with an embedding groove 103 for accommodating the cutting block 101, the cutting block 101 is fixed with the embedding groove 103 by bolts, the inner side or the outer side of the end of each cutting block 101 is provided with a tool bit 102 through a groove 104, and the tool bit 102 is located on the inner side or the outer side, and the positions of the tool bits 102 in the four outer cutting parts 10 and the inner cutting parts 30 are symmetrically arranged in pairs, that is, two tool bits 102 are located on the inner side and two tool bits 102 are located on the outer side, so that the outer cutting part 10 can realize the inner and outer layer cutting of the hole through the tool bits 102 on the inner and outer sides to ensure the cutting quality.

[0029] In the embodiment, the outer wall of the telescopic drill bit 3 is provided with an inner chip removal groove 31, the direction and position of the inner chip removal groove 31 are adapted to the outer chip removal groove 11, the inner chip removal groove 31 is gradually shallower, and one side of the embedding groove 103 of the hollow drill bit 1 and the telescopic drill bit 3 is provided with a notched groove 12, the position of the notched groove 12 is located at one end of the outer chip removal groove 11 and the inner chip removal groove 31, so that when the telescopic drill bit 3 drills, the debris can be guided to the outer chip removal groove 11 on the outer wall of the hollow drill bit 1 through the inner chip removal groove 31, to ensure that the telescopic drill bit 3 can normally remove the chips when drilling.

[0030] In the embodiment, the width of the connecting rod 4 is adapted to the width of the accommodating groove 21, and the outer side wall of the connecting rod 4 is recessed in the surface of the side wall of the drill shank 2, so that the drill shank 2 is prevented from limiting the connecting rod 4 when clamped and fixed by the drill chuck, and the structure design ensures that the drill bit can be freely adjusted during the clamping process.

[0031] In the embodiment, the adjusting turntable 5 is provided with a rotating shaft 52 at the center of one end, the rotating shaft 52 is rotationally arranged in the inner wall of one end of the hollow drill bit 1, and an adjusting hole 53 for tool screwing is arranged at the center of the other end of the adjusting turntable 5.

[0032] In the embodiment, a rotating groove 14 is arranged on the inner wall of one end of the hollow drill bit 1, a rotating seat 15 is arranged in the rotating groove 14, the rotating seat 15 is sleeved on the outer side of the rotating shaft 52 and rotationally connected with the rotating shaft 52, and a certain frictional resistance exists between the rotating seat 15 and the rotating shaft 52, so that the loosening of the adjusting turntable 5 is avoided and the expansion and contraction of the telescopic drill bit 3 is prevented.

[0033] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A hollow high speed core drill bit, characterized in that, The utility model provides a hollow drill bit (1), drill handle (2) and telescopic drill assembly, the hollow drill bit (1) is cylindrical structure with axis, the hollow drill bit (1) one end center is provided with the drill handle (2), and the other end of hollow drill bit (1) opening is evenly distributed with several external cutting part (10), and the outer wall of hollow drill bit (1) is provided with the outer flutes (11) on one side of every cutting part;The inside of hollow drill bit (1) is provided with the telescopic drill assembly, and the telescopic drill assembly includes telescopic drill head (3), connecting rod (4) and adjusting turntable (5), the telescopic drill head (3) is circular ring, and the one end of telescopic drill head (3) is evenly distributed with several internal cutting part (30) along the circumference, and the position of every internal cutting part (30) corresponds with the position of external cutting part (10) on the hollow drill bit (1) respectively;The other end of telescopic drill head (3) is evenly provided with several connecting rod (4) along the circumference respectively, and the connecting rod (4) is along the axis direction setting, and one end of connecting rod (4) is through the end of hollow drill bit (1), and the sidewall of drill handle (2) is provided with several accommodating grooves (21) for accommodating one end of connecting rod (4), so that one end of connecting rod (4) extends to the outside of hollow drill bit (1) and is embedded into accommodating groove (21), and the outside of several connecting rod (4) is provided with guide block (42), and the inner wall of hollow drill bit (1) is provided with several guide grooves (13) for accommodating guide block (42) and being along the axial direction, so that guide block (42) and guide groove (13) are matched to realize the guidance of telescopic drill head (3), and the inside of several connecting rod (4) is provided with several tooth blocks (41) and is along the axial direction, and the inside of several connecting rod (4) is provided with adjusting turntable (5), and the outside sidewall of adjusting turntable (5) is provided with helical ridge (51) and is engaged with tooth block (41), so that adjusting turntable (5) and every connecting rod (4) are connected through the transmission of helical ridge (51) and tooth block (41), and adjusting turntable (5) is rotatably arranged at one end of hollow drill bit (1), and adjusting turntable (5) is rotated by tool, and connecting rod (4) is driven to move and makes telescopic drill head (3) extend from hollow drill bit (1) or retract into hollow drill bit (1) under the cooperation of helical ridge (51) and tooth block (41).

2. A hollow high speed core drill bit as claimed in claim 1 wherein, The external cutting part (10) and internal cutting part (30) all include cutting block (101) and cutter head (102) arranged on cutting block (101), one end of the hollow drill bit (1) and telescopic drill head (3) is provided with embedding slot (103) for accommodating cutting block (101), and the inside or outside of the end of every cutting block (101) is provided with cutter head (102) through recess (104) respectively, and cutter head (102) is located on the inside or outside.

3. A hollow high speed core drill according to claim 2, wherein The positions of cutter head (102) in several external cutting part (10) and internal cutting part (30) are symmetrically arranged.

4. A hollow high speed core drill bit as claimed in claim 2 wherein, The outer wall of the telescopic drill bit (3) is provided with an inner chip groove (31), the direction and position of which are adapted to the outer chip groove (11), and the hollow drill bit (1) and the telescopic drill bit (3) are provided with notched grooves (12) on one side of the embedding groove (103), the positions of the notched grooves (12) being located at one end of the outer chip groove (11) and the inner chip groove (31) respectively.

5. A hollow high speed core drill bit as claimed in claim 1 wherein, The width of the connecting rod (4) is adapted to the width dimension of the accommodating groove (21), and the outer side wall of the connecting rod (4) is recessed on the side wall surface of the drill handle (2).

6. A hollow high speed core drill bit as defined in claim 1, wherein, The regulating turntable (5) is provided with a rotating shaft (52) at one end, which is rotatably arranged in the inner wall of one end of the hollow drill bit (1), and the other end of the regulating turntable (5) is provided with an adjusting hole (53) for tool screwing.

7. A hollow high speed core drill according to claim 6, wherein The inner wall of one end of the hollow drill bit (1) is provided with a rotating groove (14), and the rotating groove (14) is provided with a rotating seat (15), which is sleeved on the outer side of the rotating shaft (52) and is rotatably connected with the rotating shaft (52).

8. A hollow high speed core drill bit as defined in claim 1, wherein, The outer wall of the telescopic drill bit (3) is arranged close to the inner wall of the hollow drill bit (1).

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