Drill bit assembly suitable for preparing chemical analysis scrap sample and drilling machine

Abstract

The utility model provides a drill bit assembly suitable for preparing a chemical analysis scrap sample. The drill bit assembly comprises an elastic chuck and a cutter handle, the elastic chuck is columnar, an embedding groove is formed in one end of the elastic chuck and penetrates through the elastic chuck in the radial direction, so that a first clamping block and a second clamping block are formed on the elastic chuck, and the embedding groove is formed between the first clamping block and the second clamping block; one end of the replaceable blade can be clamped in the embedding groove in an embedding manner; one end of the cutter handle is provided with a positioning hole for axial insertion of the elastic chuck; an extrusion face is arranged on the outer wall of the elastic chuck and used for abutting against the inner wall of the positioning hole in the radial direction, and then the first clamping block and the second clamping block are driven to elastically deform and gather and clamp the replaceable blade. The blade can be prevented from loosening when a high-yield-strength material scrap sample is drilled, so that the collision contact between the blade and the material is reduced, the abrasion of the blade is relieved, the service life of the blade is prolonged, and the drilling cost is further reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of processing and preparing chemical analysis samples, in particular to a drill bit assembly and a drilling machine suitable for preparing chemical analysis chip samples. Background Art

[0002] With the advancement of science and technology, the analysis of metal samples in the laboratory is no longer limited to spectrometer analysis. Carbon-sulfur analysis and / or chemical wet analysis are used for many types of steel or high value-added alloys in order to improve the production process level and product quality. Unlike "spectrometer using bulk samples for analysis", when performing carbon-sulfur analysis or chemical wet analysis on metal samples, there are special requirements for the shape of the analyzed object, that is, the shape of the metal sample must be in the shape of chips. At present, the laboratory usually uses drilling to prepare chip samples (hereinafter referred to as chip samples). The entire sample is fixed on a vertical drilling machine, and the drilling machine motor drives the drill bit to rotate and abut against the entire sample to achieve the purpose of drilling metal chip samples. The yield strength of common steel varieties or high value-added alloys is between 200-300MPa, and conventional high-strength steel drill bits can be used to drill chip samples. However, some special fields, such as aerospace, usually require chemical analysis of steels with extremely high yield strength such as nickel-based alloys. The yield strength of steels studied in these special fields is usually 900-1000MPa. Conventional high-strength steel drill bits are not hard enough to drill chip samples. In this industry, tungsten carbide drill bits with greater hardness are usually used to drill chip samples.

[0003] Tungsten carbide drill bits for preparing chemical analysis chips are generally made of tungsten carbide rods. Although their hardness is sufficient to drill steel chips with high yield strength such as nickel-based alloys, they are prone to breakage when drilling high yield strength chips due to their poor toughness. Tungsten carbide drill bits are expensive, resulting in high chip drilling costs. In order to reduce costs, broken drill bits are usually re-welded and used repeatedly in laboratories. However, the strength of the welded drill bits is poor and they will break again immediately after a period of use, so the effect is not good.

[0004] In order to prevent the tungsten carbide drill bit from breaking and frequently replacing the drill bit, and to reduce the sampling cost, the laboratory has currently adjusted the structure of the tungsten carbide drill bit, discarded the original rod-shaped drill bit, and replaced it with a blade-type tungsten carbide drill bit. The tungsten carbide blade is placed in the slot of the tool handle, and then the tungsten carbide blade is fastened to the tool handle with a screw (the specific structure can be referred to the Chinese utility model patent document with the current publication number of "CN203578881U"). Through the above technical solution, when drilling chip samples, the tungsten carbide blade can be clamped in both directions through the slot, and lateral support is applied to the blade, which effectively reduces the incidence of blade breakage. However, since the tungsten carbide blade is fixed with screws, the screws will loosen due to vibration during use. After a period of use, a gap will be generated between the blade and the tool groove, causing the blade to vibrate turbulently during the drilling process, thereby increasing the risk of blade breakage and wear in the opposite direction. Utility Model Content

[0005] The utility model is made in view of the above problems existing in the prior art.

[0006] In order to solve the above technical problems, the utility model is achieved through the following technical solutions:

[0007] In the first aspect, the utility model relates to a drill bit assembly suitable for preparing chip samples for chemical analysis, comprising: an elastic chuck and a shank; the elastic chuck is columnar and is provided with an engaging groove at one end, the engaging groove radially penetrates the elastic chuck, so that a first clamp block and a second clamp block are formed on the elastic chuck, and the engaging groove is arranged between the first clamp block and the second clamp block; a replaceable blade, one end of which can be engaged and clamped in the engaging groove; a positioning hole is provided at one end of the shank for axial insertion of the elastic chuck; an extrusion surface is provided on the outer wall of the elastic chuck, and the extrusion surface is used to radially abut against the inner wall of the positioning hole, thereby driving the first clamp block and the second clamp block to undergo elastic deformation and gather and clamp the replaceable blade.

[0008] Furthermore, the elastic clamp extends radially outward to form an inserting cone, and the extrusion surface is formed on the outer side surface of the inserting cone.

[0009] Furthermore, a stop shoulder is formed in the engagement groove for axially abutting against the replaceable blade.

[0010] Furthermore, the diameter of the bottom surface of one end of the plug-in cone close to the replaceable blade is larger than the positioning hole, and the shoulder is integrally formed on the bottom surface of one end of the plug-in cone close to the replaceable blade.

[0011] Furthermore, the replaceable blade is a fixed-point drill blade.

[0012] Furthermore, an elastic layer is provided on the outer wall of one end of the knife handle where the positioning hole is provided.

[0013] Furthermore, a guide surface is formed at the bottom of the engaging groove, and the guide surface is used to guide the first clamping block and the second clamping block to perform elastic deformation.

[0014] Furthermore, the groove bottom of the embedding groove is recessed inwards, and at least one guiding surface is formed at the recessed portion of the embedding groove, and the cross section of the guiding surface is arc-shaped.

[0015] Furthermore, the groove bottom of the replaceable blade is recessed inward, and at least three guide surfaces are formed at the recess of the mating groove, which are respectively a first guide plane, a second guide arc surface and a third guide arc surface. The first guide plane is located at the bottom of the recess of the mating groove, and the second guide arc surface and the third guide arc surface are respectively located on both sides of the first guide plane.

[0016] In a second aspect, the utility model relates to a drilling machine for preparing chemical analysis samples, comprising a drill bit assembly as described above.

[0017] The utility model has the advantages of eliminating screws, enhancing the vibration resistance of the drill bit, and effectively preventing "the blade from loosening when drilling high yield strength material chips", thereby reducing the collision and contact between the blade and the material, slowing down the wear of the blade, and increasing the service life of the blade, thereby reducing the drilling cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A three-dimensional structural schematic diagram of a drill bit assembly provided in a specific embodiment of the utility model;

[0019] Figure 2 A schematic diagram of a three-dimensional cross-sectional structure of a drill bit assembly provided in a specific embodiment of the utility model;

[0020] Figure 3 A schematic diagram of the structure of a knife handle provided in a specific embodiment of the utility model;

[0021] Figure 4 A schematic diagram of the structure of an elastic chuck provided for a specific embodiment of the utility model;

[0022] Figure 5 is a structural schematic diagram of a second embodiment of a guide surface;

[0023] In the figure:

[0024] Figure numerals: 1, tool handle; 11, positioning hole; 12, elastic layer; 2, elastic chuck; 21, fitting groove; 22, first clamping block; 23, second clamping block; 24, extrusion surface; 25, plug-in cone; 26, shoulder; 27, guide surface; 271, first guide plane; 272, first guide arc surface; 273, third guide arc surface. DETAILED DESCRIPTION

[0025] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but cannot be understood as limiting the present invention.

[0026] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0028] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] The utility model is further described in detail below with reference to the accompanying drawings:

[0030] The first specific implementation of the utility model is:

[0031] refer to Figure 1~Figure 4A drill bit assembly suitable for preparing chip samples for chemical analysis comprises, from top to bottom, a tool handle 1, an elastic chuck 2 and a replaceable blade 3. A positioning hole 11 is provided at one end of the tool handle 1 close to the replaceable blade 3, i.e., the bottom of the tool handle 1. The elastic chuck 2 is columnar and can be positioned in the positioning hole 11 in the form of axial insertion. An engaging groove 21 is provided at one end of the elastic chuck 2 away from the tool handle 1, i.e., the bottom of the elastic chuck 2. The engaging groove 21 radially penetrates the elastic chuck 2 and separates one end of the elastic chuck 2 to form a first clamping block 22 and a second clamping block 23. The engaging groove 21 is provided between the first clamping block 22 and the second clamping block 23 for engaging and clamping the replaceable blade 3. The outer wall of the elastic chuck 2 is provided with an extrusion surface 24, which is used to radially abut against the inner wall of the positioning hole 11.

[0032] When in use, the replaceable blade 3 can be firstly engaged and clamped in the engagement groove 21 of the elastic collet 2, and the elastic collet 2 can be placed in the positioning hole 11 of the tool handle 1, so that the replaceable blade 3, the elastic collet 2, and the tool handle 1 form a drill assembly, and then the drill assembly is placed on a workbench covered with a cushion with the tool head facing downward, and the drill assembly is axially knocked by a hammer or other tools to make the elastic collet 2 axially inserted into the positioning hole 11. When the elastic collet 2 is axially inserted into the positioning hole 11, the extrusion surface 24 of the outer wall of the elastic collet 2 will radially abut against the inner wall of the positioning hole 11, forcing the first clamping block 22 and the second clamping block 23 to undergo elastic deformation, and gather together to clamp the replaceable blade 3. In this specific embodiment, the replaceable blade 3 is a fixed-point drill blade made of tungsten carbide, and the material of the elastic collet 2 and the tool handle 1 can be carbon steel or stainless steel. Compared with the prior art, the present application adopts "the elastic chuck 2 is axially inserted into the tool handle 1 and cooperates with the extrusion surface 24 to radially abut the inner wall of the positioning hole 11, forcing the first clamping block 22 and the second clamping block 23 to deform to clamp and fix the blade", eliminating the screws, enhancing the vibration resistance of the drill bit, and effectively preventing "the blade from loosening when drilling high yield strength material chips", thereby reducing the collision and contact between the blade and the material, slowing down the wear of the blade, and increasing the service life of the blade, thereby reducing the drilling cost.

[0033] The implementation structure of the extrusion surface 24 is diverse. In this specific embodiment, a preferred implementation structure of the extrusion surface 24 is provided, specifically: the side surface of the elastic clamp 2 extends radially outward to form a plug-in cone 25, the taper of the side generatrix of the plug-in cone 25 is 1:10, and the extrusion surface 24 is formed on the outer side surface of the plug-in cone 25. When using a drilling machine to drill chip samples, the drilling machine will apply axial pressure to the drill bit so that the drill bit can drill deep into the material to drill chip samples. Therefore, when using the above-mentioned technical solution, since the extrusion surface 24 is formed on the outer side of the plug-in cone 25, when the drilling machine applies axial pressure to the drill bit, the axial pressure can secondary enhance the axial plug-in between the elastic chuck 2 and the tool handle 1, so that the plug-in cone 25 further penetrates into the positioning hole 11, thereby enhancing the radial contact between the extrusion surface 24 and the inner wall of the positioning hole 11, increasing the clamping force of the first clamp block 22 and the second clamp block 23 on the replaceable blade 3, and preventing the blade from vibrating. In theory, the greater the axial pressure on the drill bit, the greater the clamping force of the elastic chuck 2 on the replaceable blade 3.

[0034] In order to prevent the replaceable blade 3 from being axially retracted into the elastic cutter head due to the axial pressure of the drilling machine when the drill bit is drilling chips, in this specific embodiment, a shoulder 26 is formed in the engaging groove 21. When in use, the shoulder 26 can abut one end of the replaceable blade 3 to limit the circumferential position of the replaceable blade 3.

[0035] Since the replaceable blade 3 is made of tungsten carbide and has a very high hardness, in order to prevent the root of the replaceable blade 3 from contacting the tool handle 1 during drilling, thereby causing wear of the tool handle 1, in this specific embodiment, the plug-in cone 25 is close to the bottom surface of one end of the replaceable blade 3, that is, the diameter of the lower bottom surface of the plug-in cone 25 is larger than the diameter of the positioning hole 11. At the same time, the shoulder 26 is integrally formed on the lower bottom surface of the plug-in cone 25. Through the above technical solution, when the elastic chuck 2 is axially plugged into the positioning hole 11 of the tool handle 1, it can be ensured that the lower bottom surface of the plug-in cone 25 and the shoulder 26 can always maintain a distance from the positioning hole 11, thereby preventing the root of the replaceable blade 3 from contacting the tool handle 1, thereby protecting the tool handle 1.

[0036] When the blade needs to be replaced in the present application, the drill bit assembly is usually removed from the drilling machine, and then the drill bit assembly is held by hand at one end of the tool handle 1, with the tool head end facing downward, and knocked against a workbench or other object, so that the elastic chuck 2 is axially shaken out of the tool handle 1, thereby removing the replaceable blade 3. In order to reduce the damage to the tool handle 1 and the workbench caused by knocking, in the present specific embodiment, an elastic layer 12 is provided on the outer wall of one end of the tool handle 1 where the positioning hole 11 is provided, and the elastic layer 12 can be made of rubber or sponge.

[0037] refer to Figure 4, in order to avoid the first clamp block 22 and the second clamp block 23 from breaking due to deformation fatigue. In the present application, the bottom of the fitting groove 21 is recessed inward, and at least one guide surface 27 is formed at the recessed part of the fitting groove 21, and the cross section of the guide surface 27 is an arc shape. Through the above technical solution, the arc-shaped guide surface 27 is provided at the bottom of the fitting groove 21, which can help disperse the radial pressure at the root of the first clamp block 22 and the second clamp block 23 when the extrusion surface 24 radially abuts against the inner wall of the positioning hole 11, and avoid stress concentration causing deformation fatigue of the first clamp block 22 and the second clamp block 23.

[0038] refer to Figure 5 In addition to the above structure, the present application also provides another implementation structure of the guide surface 27: the bottom of the fitting groove 21 is recessed inward, and at least three guide surfaces 27 are formed at the recessed part of the fitting groove 21, and they are respectively the first guide plane 271, the second guide arc surface and the third guide arc surface 273. The first guide plane 271 is located at the bottom of the recessed fitting groove 21, and the second guide arc surface and the third guide arc surface 273 are respectively located on both sides of the first guide plane 271. After reading the above two embodiments of the guide surface 27, those skilled in the art should be able to associate other implementation methods of the guide surface 27 based on the curved surface guiding the first clamping block 22 and the second clamping block 23 to perform elastic deformation, which will not be repeated in this application.

[0039] A second specific implementation manner of the present invention: a drilling machine, comprising a drill bit assembly as in the first specific implementation manner.

[0040] The above description is only a specific embodiment of the present invention, but the technical features of the present invention are not limited thereto. Any changes or modifications made by any technician in the field of the present invention are included in the patent scope of the present invention.

Claims

1. A drill bit assembly suitable for preparing chip samples for chemical analysis, characterized in that: include: A tool handle (1) and an elastic collet (2); The elastic clamp (2) is columnar and is provided with an engaging groove (21) at one end, the engaging groove (21) radially penetrates the elastic clamp (2), so that a first clamp block (22) and a second clamp block (23) are formed on the elastic clamp (2), and the engaging groove (21) is provided between the first clamp block (22) and the second clamp block (23); A replaceable blade (3) which can be engaged and clamped in the engagement groove (21); One end of the tool handle (1) is provided with a positioning hole (11) for axial insertion of the elastic chuck (2); The outer wall of the elastic clamp (2) is provided with an extrusion surface (24), and the extrusion surface (24) is used to radially abut against the inner wall of the positioning hole (11), thereby driving the first clamping block (22) and the second clamping block (23) to undergo elastic deformation and gather together to clamp the replaceable blade (3).

2. The drill bit assembly suitable for preparing chip samples for chemical analysis according to claim 1, characterized in that: The elastic clamp (2) extends radially outward to form an inserting truncated cone (25), and the extrusion surface (24) is formed on the outer side surface of the inserting truncated cone (25).

3. The drill bit assembly suitable for preparing chip samples for chemical analysis according to claim 2, characterized in that: A stop shoulder (26) is formed in the engagement groove (21) for axially abutting against the replaceable blade (3).

4. The drill bit assembly suitable for preparing chip samples for chemical analysis according to claim 3, characterized in that: The diameter of the bottom surface of one end of the inserting truncated cone (25) close to the replaceable blade (3) is larger than the positioning hole (11), and the stop shoulder (26) is integrally formed on the bottom surface of one end of the inserting truncated cone (25) close to the replaceable blade (3).

5. The drill bit assembly suitable for preparing chip samples for chemical analysis according to claim 1, characterized in that: The replaceable blade (3) is a fixed-point drill blade.

6. The drill bit assembly suitable for preparing chip samples for chemical analysis according to claim 1, characterized in that: An elastic layer (12) is provided on the outer wall of one end of the knife handle (1) where the positioning hole (11) is provided.

7. The drill bit assembly suitable for preparing chip samples for chemical analysis according to any one of claims 1 to 6, characterized in that: A guide surface (27) is formed at the bottom of the engaging groove (21), and the guide surface (27) is used to guide the first clamping block (22) and the second clamping block (23) to perform elastic deformation.

8. The drill bit assembly suitable for preparing chip samples for chemical analysis according to claim 7, characterized in that: The groove bottom of the embedding groove (21) is recessed inwards, and at least one guide surface (27) is formed at the recessed portion of the embedding groove (21), and the cross section of the guide surface (27) is in the shape of an arc.

9. The drill bit assembly suitable for preparing chip samples for chemical analysis according to claim 7, characterized in that: The bottom of the engaging groove (21) is recessed inwardly, and at least three guide surfaces (27) are formed at the recessed portion of the engaging groove (21), and are respectively a first guide plane (271), a second guide arc surface, and a third guide arc surface (273); the first guide plane (271) is located at the recessed bottom of the engaging groove (21), and the second guide arc surface and the third guide arc surface (273) are respectively located at two sides of the first guide plane (271).

10. A drilling machine for preparing samples for chemical analysis, characterized in that: A drill bit assembly suitable for preparing chip samples for chemical analysis as described in any one of claims 1 to 9.

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