Side fixing type crown drill

Abstract

The utility model provides a side fixing type crown drill, and belongs to the field of drilling tools. The connecting structure solves the problem that according to an existing connecting structure between a drill tip and a drill body, the drill tip is not convenient and fast to replace. The side fixing type crown drill comprises a cutter bar and a cutter handle, a drill tip is arranged on the cutter bar, a mounting groove for mounting the drill tip is formed in the cutter bar, the drill tip is detachably and fixedly mounted on the mounting groove through screws, and screw holes for mounting the screws are formed in the front side and the rear side of the mounting groove. A screw through hole for mounting a screw is formed in the drill tip, and the center of the screw hole in the cutter bar and the center of the screw through hole in the drill tip are of an eccentric structure. The utility model has the advantage of high stability.

Description

Technical Field

[0001] The utility model belongs to the field of drilling tools and relates to a crown drill, in particular to a side-fixed crown drill. Background Art

[0002] In the metal hole processing technology, the use of disposable drill bits with replaceable drill tips can greatly reduce production costs and improve economic benefits.

[0003] The connection structure between the existing drill tip and the drill body, such as a connection structure between the drill tip and the drill body disclosed in the China Patent Library (application number: 202020205104.7), includes a cutter body, a cutter head, a screw and a special hexagonal plate. The thread on the side of the screw connected to the cutter body is a reverse thread, and the thread on the side connected to the cutter head is a positive thread. The special hexagonal plate is inserted from the tail of the cutter body. The cutter head can be pulled into the cutter body by simply turning it clockwise to connect the cutter head and the cutter body together.

[0004] The connection structure between the drill tip and the drill body integrates the cutter head and the cutter body into one, and the cutter head is replaceable. Although it has the advantages of reliable connection and ready installation, the connection structure still has the problem of inconvenient replacement of the drill tip. Summary of the invention

[0005] The utility model aims to solve the above problems existing in the prior art and provides a side-fixed crown drill with a replaceable drill tip and high stability.

[0006] The purpose of the utility model can be achieved through the following technical solutions: a side-fixed crown drill, including a tool rod and a tool handle, the tool rod is provided with a drill tip, the tool rod is provided with a mounting groove for installing the drill tip, and is characterized in that the drill tip is detachably fixed to the mounting groove by a screw, the front and rear sides of the mounting groove are provided with screw holes for installing the screws, the drill tip is provided with a screw through hole for installing the screw, and the center of the screw hole on the tool rod and the center of the screw through hole on the drill tip are arranged in an eccentric structure.

[0007] In the above-mentioned side-fixed crown drill, the upper end of the tool rod has a bottom positioning surface for installing the drill tip relative to the bottom of the mounting groove, and the side end of the tool rod has a side positioning surface for installing the drill tip relative to the mounting groove, and the side end surface of the drill tip and the side positioning surface of the tool rod are clearance-fitted.

[0008] In the above-mentioned side-fixed crown drill, a thread matching with the screw is provided on one side of the mounting groove and opposite to the screw hole.

[0009] In the above-mentioned side-fixed crown drill, a spiral groove is provided on the outside of the tool rod, and the spiral groove is arranged circumferentially along the tool rod.

[0010] Compared with the prior art, the high stability side-fixed crown drill has the following advantages:

[0011] 1. The drill tip is detachably fixed on the shank by screws, making the drill tip easy to connect and ready to install.

[0012] 2. The center of the screw hole on the arbor and the center of the screw through hole on the drill tip are arranged in an eccentric structure. When the screw fixes the drill tip, the installation of the drill tip is more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the utility model.

[0014] Figure 2 It is a partial structural schematic diagram of the utility model.

[0015] Figure 3 It is a cross-sectional structural schematic diagram of the utility model.

[0016] In the figure, 1, tool rod; 2, tool handle; 3, drill tip; 4, mounting groove; 5, screw hole; 6, screw through hole; 7, bottom positioning surface; 8, side positioning surface; 9, threaded hole; 10, spiral groove; 11, screw. DETAILED DESCRIPTION

[0017] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0018] like Figure 1 , Figure 2 , Figure 3 As shown, the high-stability side-fixed crown drill comprises a arbor 1 and a shank 2. The arbor 1 and the shank 2 are integrally formed structures. A drill tip 3 is arranged on the arbor 1. A mounting groove 4 for mounting the drill tip 3 is provided on the arbor 1. The mounting groove 4 makes the arbor 1 have a concave structure. The mounting groove 4 makes the upper end of the arbor 1 have an installation space for mounting the drill tip 3. The drill tip 3 is detachably fixed on the mounting groove 4 by a single screw 11. Screw 11 holes 5 for mounting the screw 11 are provided on the front and rear sides of the mounting groove 4. A screw 11 through hole 6 for mounting a single screw 11 is provided on the drill tip 3. The center of the screw 11 hole 5 on the arbor 1 and the center of the screw 11 through hole 6 on the drill tip 3 are eccentrically arranged.

[0019] In the above-mentioned side-fixed crown drill, the upper end of the tool bar 1 and relative to the bottom of the installation groove 4 has a bottom positioning surface 7 for the installation of the drill tip 3, and the side end of the tool bar 1 and relative to the installation groove 4 has a side positioning surface 8 for the installation of the drill tip 3, and the side end surface of the drill tip 3 and the side positioning surface 8 of the tool bar 1 are clearance-matched. During the installation of the drill tip 3, the bottom of the drill tip 3 is connected to the bottom positioning surface 7, and the side wall of the drill tip 3 is clearance-matched with the side positioning surface 8, and then the screw 11 is sequentially passed through the screw 11 hole 5 on the tool bar 1 and the screw 11 through hole 6 on the drill tip 3 until it passes through the screw 11 hole 5 at the rear end of the tool bar 1, thereby fixing the drill tip 3 on the tool bar 1.

[0020] To be more specific, one side of the mounting groove 4 and the hole 5 relative to the screw 11 has a thread matching the screw 11 , and the threaded hole 9 matches the external thread of the screw 11 , thereby fixing the drill tip 3 on the arbor 1 .

[0021] To be more specific, a spiral groove 10 is formed on the outside of the cutter bar 1 , and the spiral groove 10 is arranged circumferentially along the cutter bar 1 .

[0022] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0023] Although the terms such as the tool bar 1, tool handle 2, drill tip 3, mounting slot 4, screw hole 5, screw through hole 6, bottom positioning surface 7, side positioning surface 8, threaded hole 9, spiral slot 10, screw 11, etc. are used more frequently in this article, the possibility of using other terms is not excluded. The use of these terms is only for more convenient description and explanation of the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model.

Claims

1. A side-fixed crown drill, comprising a shank (1) and a shank (2), wherein the shank (1) is provided with a drill tip (3), and the shank (1) is provided with a mounting groove (4) for mounting the drill tip (3), characterized in that: The drill tip (3) is detachably fixedly mounted on the mounting groove (4) by means of a screw (11); screw (11) holes (5) for mounting the screw (11) are provided on both the front and rear sides of the mounting groove (4); a screw (11) through hole (6) for mounting the screw (11) is provided on the drill tip (3); and the center of the screw (11) hole (5) on the arbor (1) and the center of the screw (11) through hole (6) on the drill tip (3) are arranged in an eccentric structure.

2. A side-fixed crown drill according to claim 1, characterized in that: The upper end of the tool rod (1) and relative to the bottom of the mounting groove (4) has a bottom positioning surface (7) for mounting the drill tip (3), and the side end of the tool rod (1) and relative to the mounting groove (4) has a side positioning surface (8) for mounting the drill tip (3), and the side end surface of the drill tip (3) and the side positioning surface (8) of the tool rod (1) are clearance-matched.

3. The side-fixed crown drill according to claim 1, characterized in that: A thread matching the screw (11) is provided on one side of the installation groove (4) and in the hole (5) opposite to the screw (11).

4. The side-fixed crown drill according to claim 1, characterized in that: A spiral groove (10) is provided on the outside of the knife rod (1), and the spiral groove (10) is arranged in a circumferential direction along the knife rod (1).

Images