Electric hammer drill bit with convex arc chip removal groove

Abstract

The utility model relates to an electric hammer drill with a convex arc-shaped chip removal groove, which can not only improve the drilling efficiency but also improve the strength of the rod body, comprising an electric hammer drill body, wherein a shoulder section is provided in the electric hammer drill body, a drill rod section is provided on one side of the shoulder section and a drill shank section is provided on the other side of the shoulder section, the diameter of the shoulder section is larger than the diameter of the drill rod section and the diameter of the shoulder section is larger than the diameter of the drill shank section, a spiral chip removal groove is provided on the rod body of the drill rod section, an arc-shaped protrusion is provided in the middle of the groove bottom surface of the spiral chip removal groove, an arc-shaped groove is provided on both sides of the arc-shaped protrusion, one side of the arc-shaped groove is connected to the corresponding side of the arc-shaped protrusion and the other side of the arc-shaped groove is connected to the groove wall of the spiral chip removal groove on the corresponding side. Advantages: An electric hammer drill with a convex arc-shaped chip removal groove can not only improve the drilling efficiency but also improve the strength of the rod body.

Description

Technical Field

[0001] The utility model belongs to the field of electric hammer drill manufacturing, and in particular relates to an electric hammer drill with a convex arc chip removal groove. Background Art

[0002] The prior patent CN 203853966 U, entitled "A kind of electric hammer drill bit" owned by the holding subsidiary (Hangzhou Lichang Tools Co., Ltd.) of the holding parent company (Hangzhou Jinzuan Tools Co., Ltd.) of the applicant, includes a shank with a cutter head embedded at the tip and a shank handle. The shank and the shank handle are of an integral structure. The surface of the shank is provided with two spiral chip grooves that are radially opposite to each other. The depth of the spiral chip groove gradually becomes shallower from 3 cm before the outlet end to the outlet end. There is no trace of the tool retreat step and no sharp angle at the outlet end of the spiral chip groove; the angle between the blade of the spiral chip groove and the axial centerline of the drill bit is an obtuse angle. The spiral chip groove is a semicircular spiral chip groove, and the angle between the blade of the semicircular spiral chip groove and the axial centerline of the drill bit is 145±10°. The spiral chip groove is a flat-bottomed trapezoidal spiral chip groove, and the angle between the blade of the flat-bottomed trapezoidal spiral chip groove and the axial centerline of the drill bit is 135±10°. The shank handle is a square handle, and a key groove is opened on each face of the square handle. The disadvantage is that the spiral chip groove of this type of electric hammer drill is a semicircular spiral chip groove or a flat-bottomed trapezoidal spiral chip groove. The chip groove of this structure is more likely to cause collision and extrusion between chips during the chip removal process. Therefore, the chip removal smoothness of this type of electric hammer drill is relatively poor, which in turn affects the drilling efficiency. Utility Model Content

[0003] Design purpose: In order to avoid the shortcomings of the background technology, a convex arc chip groove electric hammer drill bit is designed which can not only improve the drilling efficiency but also improve the strength of the rod body.

[0004] Design plan: To achieve the above design objectives.

[0005] 1. A shoulder section is provided in the electric hammer drill body, a drill rod section is provided on one side of the shoulder section and a drill shank section is provided on the other side of the shoulder section, the diameter of the shoulder section is larger than the diameter of the drill rod section and the diameter of the shoulder section is larger than the diameter of the drill shank section, a spiral chip groove is provided on the rod body of the drill rod section, an arc-shaped protrusion is provided in the middle of the groove bottom surface of the spiral chip groove, an arc-shaped groove is provided on both sides of the arc-shaped protrusion, one side of the arc-shaped groove is connected to the corresponding side of the arc-shaped protrusion and the other side of the arc-shaped groove is connected to the groove wall of the spiral chip groove on the corresponding side, which is one of the technical features of the utility model. The purpose of such design is that: a shoulder section is provided in the electric hammer drill body, a drill rod section is provided on one side of the shoulder section and a drill shank section is provided on the other side of the shoulder section, the diameter of the shoulder section is larger than the diameter of the drill rod section and the diameter of the shoulder section is larger than the diameter of the drill shank section, a spiral chip groove is provided on the rod body of the drill rod section, an arc-shaped protrusion is provided in the middle of the groove bottom surface of the spiral chip groove, an arc-shaped groove is provided on both sides of the arc-shaped protrusion, one side of the arc-shaped groove is connected to the corresponding side of the arc-shaped protrusion and the other side of the arc-shaped groove is connected to the groove wall of the spiral chip groove on the corresponding side, that is, the chip groove has a structure with a protrusion in the middle and concave on both sides. When a convex arc-shaped chip groove electric hammer drill is used for drilling, its chip removal The chips are removed more smoothly and quickly (the chip removal groove is provided with arc-shaped protrusions and arc-shaped grooves. During the chip removal process, the arc-shaped protrusions have a certain chip separation effect on the chips passing through the chip removal groove. At this time, the chips in the chip removal groove are divided into two paths, one path is removed along one arc-shaped groove, and the other path is removed along the other arc-shaped groove. This reduces the degree of collision and extrusion between the overall chips, thereby improving the chip removal smoothness of the electric hammer drill bit). This can effectively improve the drilling efficiency of an electric hammer drill bit with a convex arc-shaped chip removal groove; in addition, the setting of the arc-shaped protrusion can also improve the rod body strength of the drill rod section in an electric hammer drill bit with a convex arc-shaped chip removal groove, thereby improving the service life of an electric hammer drill bit with a convex arc-shaped chip removal groove.

[0006] 2. The design that the width of an arc-shaped protrusion is one-half to five-sixths of the width of the spiral chip groove, and the width of an arc-shaped groove is one-twelfth to three-twelfths of the width of the spiral chip groove is the second technical feature of the utility model. The purpose of such a design is that the width of an arc-shaped protrusion is one-half to five-sixths of the width of the spiral chip groove, and the width of an arc-shaped groove is one-twelfth to three-twelfths of the width of the spiral chip groove, so that the rod strength of the drill rod section in the convex arc-shaped chip groove electric hammer drill can be improved while ensuring the smooth chip removal effect of the convex arc-shaped chip groove electric hammer drill.

[0007] 3. The upper end surface of the outer end of the drill rod section is provided with an alloy cutter head mounting groove, and the alloy cutter head mounting groove passes through the left and right sides of the drill rod section. This is the third technical feature of the utility model. The purpose of this design is that the upper end surface of the outer end of the drill rod section is provided with an alloy cutter head mounting groove, and the alloy cutter head mounting groove passes through the left and right sides of the drill rod section. The setting of the alloy cutter head mounting groove not only facilitates the welding of the alloy cutter head and the drill rod section, but also can improve the strength of the combination of the two.

[0008] 4. The cross section of the drill shank section is square, and a keyway is provided on each of the four sides of the drill shank section, which is the fourth technical feature of the utility model. The purpose of this design is that the cross section of the drill shank section is square, and a keyway is provided on each of the four sides of the drill shank section, which facilitates the assembly of a convex arc chip removal groove electric hammer drill bit and an electric hammer.

[0009] 5. A truncated cone transition section is provided between the shaft shoulder section and the drill rod section, and the narrow circle diameter in the truncated cone transition section matches the diameter of the drill rod section, and the wide circle diameter in the truncated cone transition section matches the diameter of the shaft shoulder section; a transition inclined surface section is provided between the shaft shoulder section and the drill shank section with a square cross section, which is the fifth technical feature of the utility model. The purpose of such design is that a truncated cone transition section is provided between the shaft shoulder section and the drill rod section, and the narrow circle diameter in the truncated cone transition section matches the diameter of the drill rod section, and the wide circle diameter in the truncated cone transition section matches the diameter of the shaft shoulder section; a transition inclined surface section is provided between the shaft shoulder section and the drill shank section with a square cross section, so that there are no sharp angles between the shaft shoulder section and the drill rod section and between the shaft shoulder section and the drill shank section, thereby improving the safety of use of a convex arc chip removal groove electric hammer drill.

[0010] Technical solution: A convex arc-shaped chip groove electric hammer drill bit, comprising an electric hammer drill bit body, a shoulder section is provided in the electric hammer drill bit body, a drill rod section is provided on one side of the shoulder section and a drill shank section is provided on the other side of the shoulder section, the diameter of the shoulder section is larger than the diameter of the drill rod section and the diameter of the shoulder section is larger than the diameter of the drill shank section, a spiral chip groove is provided on the rod body of the drill rod section, an arc-shaped protrusion is provided in the middle of the groove bottom surface of the spiral chip groove, an arc-shaped groove is provided on both sides of the arc-shaped protrusion, one side of the arc-shaped groove is connected to the corresponding side of the arc-shaped protrusion and the other side of the arc-shaped groove is connected to the groove wall of the spiral chip groove on the corresponding side.

[0011] Compared with the background technology, the utility model provides an electric hammer drill bit with a convex arc chip removal groove which can not only improve the drilling efficiency but also improve the strength of the rod body. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The present invention is a schematic diagram of the structure of an electric hammer drill bit with a convex arc chip removal groove.

[0013] Figure 2 yes Figure 1 Enlarged view of the middle circle A. DETAILED DESCRIPTION

[0014] Example 1: Refer to the attached Figure 1-Figure 2 A convex arc-shaped chip removal groove electric hammer drill, comprising an electric hammer drill body 1, wherein the electric hammer drill body 1 is provided with a shaft shoulder section 11, a drill rod section 12 is provided on one side of the shaft shoulder section 11 and a drill shank section 13 is provided on the other side of the shaft shoulder section 11, the diameter of the shaft shoulder section 11 is larger than the diameter of the drill rod section 12 and the diameter of the shaft shoulder section 11 is larger than the diameter of the drill shank section 13, a spiral chip removal groove 14 is provided on the rod body of the drill rod section 12, an arc-shaped protrusion 15 is provided in the middle of the groove bottom surface of the spiral chip removal groove 14, an arc-shaped groove 16 is provided on both sides of the arc-shaped protrusion 15, one side of the arc-shaped groove 16 is connected to the corresponding side of the arc-shaped protrusion 15 and the other side of the arc-shaped groove 16 is connected to the groove wall 141 of the spiral chip removal groove 14 on the corresponding side. The spiral chip groove 14 is in a convex arc shape, that is, the spiral chip groove 14 is convex in the middle and concave on both sides. Therefore, during the chip removal process, the spiral chip groove 14 has a certain chip separation effect on the chips passing through the spiral chip groove 14 due to the arc-shaped protrusion 15. At this time, the chips in the spiral chip groove 14 are divided into two paths, one path is used for chip removal along one arc-shaped groove 16, and the other path is used for chip removal along another arc-shaped groove 16. This reduces the degree of collision and extrusion between the overall chips, thereby improving the chip removal smoothness of the electric hammer drill bit, thereby effectively improving the drilling efficiency of an electric hammer drill bit with a convex arc chip groove.

[0015] The width of one arc-shaped protrusion 15 is one-half to five-sixths of the width of the spiral chip groove 14, and the width of one arc-shaped groove 16 is one-twelfth to three-twelfths of the width of the spiral chip groove 14. Preferably, the width of one arc-shaped protrusion 15 is two-thirds of the width of the spiral chip groove 14, and the width of one arc-shaped groove 16 is one-sixth of the width of the spiral chip groove 14.

[0016] The upper end surface of the outer end of the drill rod section 12 is provided with an alloy cutter head mounting groove 17, and the alloy cutter head mounting groove 17 passes through the left and right sides of the drill rod section 12. The cross section of the drill handle section 13 is square, and a keyway 18 is respectively provided on the four sides of the drill handle section 13.

[0017] A truncated cone-shaped transition section 19 is provided between the shoulder section 11 and the drill rod section 12, wherein the narrow circle diameter in the truncated cone-shaped transition section 19 matches the diameter of the drill rod section 12 and the wide circle diameter in the truncated cone-shaped transition section 19 matches the diameter of the shoulder section 11; a transition inclined surface section 10 is provided between the shoulder section 11 and a drill shank section 13 having a square cross-section.

[0018] It should be understood that although the above embodiments provide a relatively detailed textual description of the design concept of the present utility model, these textual descriptions are only simple textual descriptions of the design concept of the present utility model, rather than limitations on the design concept of the present utility model. Any combination, addition or modification that does not exceed the design concept of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A convex arc-shaped chip removal groove electric hammer drill, comprising an electric hammer drill body (1), wherein the electric hammer drill body (1) is provided with a shaft shoulder section (11), a drill rod section (12) is provided on one side of the shaft shoulder section (11), and a drill shank section (13) is provided on the other side of the shaft shoulder section (11), the diameter of the shaft shoulder section (11) is greater than the diameter of the drill rod section (12), and the diameter of the shaft shoulder section (11) is greater than the diameter of the drill shank section (13), and the rod body of the drill rod section (12) is provided with a spiral chip removal groove (14), wherein: An arc-shaped protrusion (15) is provided in the middle of the groove bottom surface of the spiral chip removal groove (14), and an arc-shaped groove (16) is provided on both sides of the arc-shaped protrusion (15), one side of the arc-shaped groove (16) is connected to the corresponding side of the arc-shaped protrusion (15), and the other side of the arc-shaped groove (16) is connected to the groove wall (141) of the spiral chip removal groove (14) on the corresponding side.

2. The electric hammer drill bit with convex arc chip removal groove according to claim 1, characterized in that: The width of an arc-shaped protrusion (15) is one-half to five-sixths of the width of the spiral chip removal groove (14), and the width of an arc-shaped groove (16) is one-twelfth to three-twelfths of the width of the spiral chip removal groove (14).

3. The electric hammer drill bit with convex arc chip removal groove according to claim 2, characterized in that: The width of an arc-shaped protrusion (15) is two-thirds of the width of the spiral chip removal groove (14), and the width of an arc-shaped groove (16) is one-sixth of the width of the spiral chip removal groove (14).

4. The electric hammer drill bit with convex arc chip removal groove according to claim 1, characterized in that: An alloy cutter head mounting groove (17) is provided on the upper end surface of the outer end of the drill rod section (12), and the alloy cutter head mounting groove (17) passes through the left and right side surfaces of the drill rod section (12).

5. The electric hammer drill bit with convex arc chip removal groove according to claim 1, characterized in that: The cross section of the drill shank section (13) is square, and a keyway (18) is respectively provided on the four side surfaces of the drill shank section (13).

6. The electric hammer drill bit with convex arc chip removal groove according to claim 1, characterized in that: A truncated cone-shaped transition section (19) is provided between the shaft shoulder section (11) and the drill rod section (12); the narrow circle diameter in the truncated cone-shaped transition section (19) matches the diameter of the drill rod section (12), and the wide circle diameter in the truncated cone-shaped transition section (19) matches the diameter of the shaft shoulder section (11); and a transition inclined surface section (10) is provided between the shaft shoulder section (11) and a drill shank section (13) having a square cross section.

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