A metal hole opener

Abstract

The present application relates to the technical field of hole opener, in particular to a kind of metal hole opener, including connecting rod, hole drill and center drill, the both ends of connecting rod are respectively equipped with connecting portion and clamping portion, one end of hole drill is equipped with the mounting hole of interference fit with connecting portion, the other end is fixed with multiple hole heads that are annular array distribution, at least two heat dissipation holes are equipped on the outer wall of hole drill, one end of center drill is inserted in connecting portion, and expanding structure is equipped on connecting portion, when the center drill is inserted in connecting portion, connecting portion is formed tension in mounting hole by expanding structure, to make center drill, connecting rod and hole drill be mutually fixed, so as to complete the installation work between center drill and hole drill, when center drill is damaged in use, center drill is withdrawn from connecting rod by using tool, that is, the disassembly work of damaged center drill is completed, the work of quick installation and disassembly is realized, and the problem that existing hole opener is inconvenient to replace when center drill is damaged is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hole openers, in particular to a metal hole opener. BACKGROUND

[0002] The existing hole openers are mainly composed of a center drill and a hole drill, and the two are generally made into an integrated structure by welding process or are installed in a split structure by nut locking. For example, the publication No. CN201677361U discloses an integrated structure hole opener which is a cylindrical table, eight teeth shaped at 30-degree angle are opened at the end of the thin-walled hollow cylindrical table, and the other end is a square table column. Another example is the publication No. CN205551565U which discloses a split structure hole opener including a cylindrical cover body and a connecting shaft, and further including a positioning drill which includes a drill bit provided with a positioning notch along the axis of the hole opener, and the cylindrical cover body includes a cutting edge.

[0003] The integrated structure can only be completely discarded when partially damaged, and the split structure with nut locking is prone to loosening of the thread during actual use, which is not only inconvenient to install, but also inconvenient to disassemble when damaged. SUMMARY

[0004] Therefore, the purpose of the present application is to provide a metal hole opener to solve the problem that the existing hole openers are inconvenient to replace when the center drill is damaged.

[0005] To achieve the above purpose, the present application provides a metal hole opener including a connecting rod, a hole drill and a center drill, characterized in that both ends of the connecting rod are respectively provided with a connecting part and a clamping part for connecting with a driving device, one end of the hole drill is provided with a mounting hole in interference fit with the connecting part, the other end is fixedly provided with a plurality of hole heads arranged in a ring array, at least two heat dissipation holes are provided on the outer wall of the hole drill, and one end of the center drill is inserted into the connecting part, and the connecting part is provided with an expansion structure.

[0006] When the center drill is inserted into the connecting part, the expansion structure causes the connecting part to form a tensile force in the mounting hole, so as to fix the center drill, the connecting rod and the hole drill.

[0007] Preferably, the connecting part is a tapered head, the inside of the connecting rod is provided with a mounting groove passing through the tapered head, and the tapered head is sleeved on one end of the center drill through the mounting groove.

[0008] Preferably, the expansion structure is at least two grooves opened from the tapered head along the axis of the connecting rod.

[0009] Preferably, the slotted end away from the mounting hole is provided with a through hole penetrating the connecting rod, and the through hole is used for facilitating the insertion of a tool into the installation slot to push out the center drill.

[0010] Preferably, the clamping part is a four-corner fixed head, one end of the four-corner fixed head is fixedly connected with the connecting rod.

[0011] Preferably, the outer wall of the hole drill is provided with a threaded structure.

[0012] Preferably, the hole head comprises a triangular saw head, the triangular saw head is fixedly connected with the hole drill away from the connecting rod, the tip of the triangular saw head is obliquely arranged, and the two sides of the triangular saw head are respectively provided with a limiting plate abutting against the inner wall and the outer wall of the hole drill, and each limiting plate is fixedly connected with the hole drill.

[0013] The beneficial effects of the present application are that when the center drill is inserted into the connecting part, the connecting part is formed in tension in the mounting hole through the expansion structure, so that the center drill, the connecting rod and the hole drill are fixedly connected with each other, thereby completing the installation work between the center drill and the hole drill, when the center drill is damaged in use, the center drill is withdrawn from the connecting rod by using a tool, that is, the disassembly work of the damaged center drill is completed, the quick installation and disassembly work is realized, and the problem that the existing hole opener is inconvenient to replace when the center drill is damaged is solved. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only illustrate the present application, and other drawings can also be obtained by those skilled in the art without any creative effort.

[0015] Fig. 1 It is a structural schematic diagram of the embodiment of the present application as a whole.

[0016] Fig. 2 It is a three-dimensional structural schematic diagram of the connecting rod of the embodiment of the present application.

[0017] Fig. 3 It is a three-dimensional structural schematic diagram of the hole drill of the embodiment of the present application.

[0018] In the drawings, the following marks are:

[0019] 1, connecting rod; 2, hole drill; 3, center drill; 4, mounting hole; 5, heat dissipation hole; 6, taper head; 7, installation slot; 8, slotted hole; 9, through hole; 10, four-corner fixed head; 11, threaded structure; 12, triangular saw head; 13, limiting plate. DETAILED DESCRIPTION

[0020] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with specific examples.

[0021] It should be noted that, unless otherwise defined, technical terms or scientific terms used in the present application should be understood as their common meanings to those having ordinary skills in the art to which the present application belongs. The terms "first", "second" and similar terms used in the present application do not represent any order, number or importance, but are only used to distinguish different components. The terms "including", "containing" and similar terms mean that the elements or objects before the terms encompass the elements or objects listed after the terms and their equivalents, without excluding other elements or objects. The terms "connected" or "connected" and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms "up", "down", "left", "right" and the like are only used to represent relative positional relationships, which may change accordingly when the absolute position of the described object changes.

[0022] As shown in Figs. 1 to 3 A metal hole opener, comprising a connecting rod 1, a hole drill 2 and a center drill 3, characterized in that the two ends of the connecting rod 1 are respectively provided with a connecting part and a clamping part for connecting with a driving device, one end of the hole drill 2 is provided with a mounting hole 4 in interference fit with the connecting part, the other end is fixedly provided with a plurality of hole heads arranged in an annular array, at least two heat dissipation holes 5 are provided on the outer wall of the hole drill 2, one end of the center drill 3 is inserted into the connecting part, and the connecting part is provided with an expansion structure.

[0023] When the center drill 3 is inserted into the connecting part, the connecting part is formed in tension in the mounting hole 4 by the expansion structure, so that the center drill 3, the connecting rod 1 and the hole drill 2 are fixed to each other.

[0024] For example, during installation, the center drill 3 is first inserted into the connecting part, then the hole drill 2 is sleeved on the connecting part through the mounting hole 4, the connecting rod 1 and the hole drill 2 are extruded, the connecting part is formed in tension in the mounting hole 4 by the expansion structure, so that the center drill 3, the connecting rod 1 and the hole drill 2 are fixed to each other, thereby completing the installation work between the center drill 3 and the hole drill 2. By connecting the clamping part with the driving device, the clamping part is driven to rotate by the driving device, thereby performing drilling work. By providing heat dissipation holes 5 on the hole drill 2, the heat generated by friction is discharged from the heat dissipation holes 5 by the rotating force, thereby improving the service life of the hole drill 2. When the center drill 3 is damaged during use, the center drill 3 is withdrawn from the connecting rod 1 by using a tool, thereby completing the disassembly work of the damaged center drill 3, realizing quick installation and disassembly, and solving the problem that the existing hole opener is not convenient to replace when the center drill 3 is damaged.

[0025] As an optional embodiment, the connecting part is a taper head 6, the inside of the connecting rod 1 is provided with a mounting groove 7 through the taper head 6, and the taper head 6 is sleeved on one end of the center drill 3 through the mounting groove 7.

[0026] For example, the connecting part is a taper head 6, the mounting hole 4 is a taper hole, and the taper head 6 is mounted in an interference fit through the taper hole. By placing one end of the center drill 3 into the mounting groove 7, the taper design allows the hole drill 2 and the connecting rod 1 to be clamped and fixed.

[0027] As an optional embodiment, the expansion structure is at least two slots 8 opened from the taper head 6 along the axis direction of the connecting rod 1.

[0028] For example, by providing the slots 8 on the taper head 6, the taper head 6 is divided into two halves. By inserting the center drill 3 into the taper head 6, the taper head 6 is clamped and tightened against the mounting hole 4 due to the slots 8, thereby completing the mutual fixation between the center drill 3, the connecting rod 1 and the hole drill 2.

[0029] As an optional embodiment, the end of the slot 8 away from the mounting hole 4 is provided with a through hole 9 penetrating through the connecting rod 1, and the through hole 9 is used for facilitating the insertion of a tool into the mounting groove 7 to push out the center drill 3.

[0030] For example, by providing the through hole 9 structure at one end of the slot 8, the tool is inserted into the mounting groove 7 to push out the center drill 3, which has the function of disassembly, and also improves the tension degree of the slot 8, avoiding damage to the taper head 6.

[0031] As an optional embodiment, the clamping part is a four-corner fixed head 10, one end of the four-corner fixed head 10 is fixedly connected with the connecting rod 1.

[0032] As an optional embodiment, the outer wall of the hole drill 2 is provided with a threaded structure 11.

[0033] For example, during the drilling process, the hole drill 2 will generate dust. By providing the threaded structure 11, the dust is discharged, and the drilling efficiency is improved.

[0034] As an optional embodiment, the hole head includes a triangular saw head 12, the triangular saw head 12 is fixedly connected with the side of the hole drill 2 away from the connecting rod 1, the tip of the triangular saw head 12 is inclined, and the two sides of the triangular saw head 12 are respectively provided with a limiting plate 13 abutting against the inner wall and the outer wall of the hole drill 2, and each limiting plate 13 is fixedly connected with the hole drill 2.

[0035] Those skilled in the art should understand that the above discussion of any embodiment is only intended to be illustrative and is not intended to be in any way limiting as to the scope of the present application, including the claims that follow it; the above embodiments or technical features among different embodiments can also be combined, steps can be implemented in any order, and there are many other changes to the different aspects of the present application as described above, which are not provided in details for the sake of brevity.

[0036] The present application is intended to cover all such alternatives, modifications, and variations as fall within the broad scope of the appended claims. Accordingly, any one of the above-described embodiments of the present application can be further modified than or combined with another in addition to the changes discussed in the above description.

Claims

1. A metal borer comprising a connecting rod (1), a bore drill (2) and a center drill (3), characterized in that, Both ends of the connecting rod (1) are respectively provided with a connecting part and a clamping part for connecting with a driving device, one end of the trepanning drill (2) is provided with a mounting hole (4) in interference fit with the connecting part, and the other end is fixedly provided with a plurality of trepanning heads arranged in an annular array, at least two heat dissipation holes (5) are arranged on the outer wall of the trepanning drill (2), one end of the center drill (3) is inserted into the connecting part, and the connecting part is provided with an expansion structure; When the center drill (3) is inserted into the connecting part, the connecting part is formed in tension in the mounting hole (4) through the expansion structure, so as to fix the center drill (3), the connecting rod (1) and the trepanning drill (2) with each other; The connecting part is a taper head (6), the connecting rod (1) is internally provided with a mounting groove (7) passing through the taper head (6), and the taper head (6) is sleeved on one end of the center drill (3) through the mounting groove (7); The expansion structure is at least two grooves (8) opened from the taper head (6) along the axis direction of the connecting rod (1); One end of the groove (8) away from the mounting hole (4) is provided with a through hole (9) penetrating through the connecting rod (1), and the through hole (9) is used to improve the tension degree of the groove (8); The outer wall of the trepanning drill (2) is provided with a threaded structure (12); The trepanning head includes a triangular saw head (13), the triangular saw head (13) is fixedly connected with the side of the trepanning drill (2) away from the connecting rod (1), the tip of the triangular saw head (13) is obliquely arranged, the two sides of the triangular saw head (13) are respectively provided with a limiting plate (14) abutting against the inner wall and the outer wall of the trepanning drill (2), and each limiting plate (14) is fixedly connected with the trepanning drill (2).

2. A metal piercer as claimed in claim 1, wherein The clamping part is a quadrangular fixed head (10), one end of the quadrangular fixed head (10) is fixedly connected with the connecting rod (1).

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