TW202218823A - Rotary self-drilling screw having detachable drill bit and lock function - Google Patents

Abstract

A rotary self-drilling screw having a detachable drill bit and the lock function comprises a rod body which is composed of an outer rod and an inner rod, installed inside the outer rod, and a detachable drilling head for metal plate or a detachable drilling head for concrete connected to the end of the rod body. The sequential operation steps of the present invention are as follows: cut a hole using the detachable drilling head for metal plate or the detachable drilling head for concrete wherein the size of the hole allows the outer rod to insert; press the outer rod by rotating the inner rod to cause one or more partial sessions of the outer rod to be deformed, so that the rotary self-drilling screw of the present invention is firmly installed on the target object. Furthermore, the present invention adopts the design of using the detachable drilling head for metal plate or the detachable drilling head for concrete not only to reduce the cost but also to provide various options of operation for the builders. Therefore, the present invention meets the required features of patentability of inventions of “creativity” and “non-obviousness”.

Description

Rotary Self-Drilling Screw with Detachable Bit and Locking Function

The present invention relates to a rod body; more specifically, it particularly refers to a rotary self-drilling screw with a detachable drill bit and a locking function.

For general rivets and expansion screws, a hand-held drilling machine is used to drill holes on the target, and then the rivets or expansion screws are placed in the holes, and they are fastened with a rivet gun or an electric wrench. achieve a fixed effect.

However, as far as the current construction process is concerned, at least two different tools must be used to position a rivet or expansion screw installation device. Therefore, if the two processes of drilling and bolting can be combined into one, in addition to reducing the In addition to the tools used, it also saves a lot of construction time.

In view of this, the applicant of this case, based on his years of experience in research and development in related fields, conducted in-depth discussions on the aforementioned deficiencies, and actively sought solutions based on the aforementioned needs. invention.

The main purpose of the present invention is to provide a drill and tap head that can be installed at will and has the effect of expanding screws or rivets at the same time.

In order to achieve the above purpose, the present invention produces two different aspects according to the different materials of the drilling target. The first aspect of the present invention has a rotary self-drilling screw with a detachable drill bit and a locking function. It is used for drilling and tapping metal materials, and it includes a rod body composed of an outer rod and an inner rod, and a detachable metal plate drilling and tapping head.

The outer rod is composed of an outer lock head, an outer rod body connected with the outer lock head, and a through hole passing through the outer lock head and the outer rod body, and the outer surface of the outer rod is provided with multiple spiral chip removal grooves, And the outer rod body is divided into screw thread section, crooked section and guide section in sequence from the connection point with the outer lock head to the distance away from the outer lock head, wherein the screw thread section and the crooked section are provided with a first outer section. The outer surface of the buckling section is provided with multiple buckling grooves, and the inner section of the buckling section is designed to be a curved surface that is conducive to generating deformation and buckling, and the guide section is internally provided with a first internal thread.

The inner rod is arranged in the through hole of the outer rod, and the inner rod is composed of an inner lock head and an inner rod body connected with the inner lock head, and the inner rod body is provided with an end away from the inner lock head. A second outer thread corresponding to the first inner thread inside the guide section, and the inner lock head is provided with an inner lock head locking groove.

The detachable metal plate drilling and tapping head is connected with the guide section of the outer rod, and the detachable metal plate drilling and tapping head is composed of a joint section and a drilling section connected with the joint section. There is a third external thread corresponding to the first internal thread inside the guide segment. In addition, the drilling and tapping segment is provided with a cutting surface, a cutting tooth and a tapping thread in sequence from the end away from the joint segment. It is composed of a first cutting surface, a second cutting surface and a third cutting surface, and the included angles between the first cutting surface, the second cutting surface, the third cutting surface and the tip are all different.

In addition, the second aspect of the present invention has a rotary self-drilling screw with a detachable drill bit and a locking function, which is mainly used for drilling and tapping concrete materials, and includes a rod body composed of an outer rod and an inner rod. And a detachable concrete drill tap.

The outer rod is composed of an outer lock head, an outer rod body connected with the outer lock head, and a through hole passing through the outer lock head and the outer rod body, and the outer surface of the outer rod is provided with multiple spiral chip removal grooves, And the outer rod body is divided into screw thread section, crooked section and guide section in sequence from the connection point with the outer lock head to the distance away from the outer lock head, wherein the screw thread section and the crooked section are provided with a first outer section. The outer surface of the buckling section is provided with multiple buckling grooves, and the inner section of the buckling section is designed to be a curved surface that is conducive to generating deformation and buckling, and the guide section is internally provided with a first internal thread.

The inner rod is arranged in the through hole of the outer rod, and the inner rod is composed of an inner lock head and an inner rod body connected with the inner lock head, and the inner rod body is provided with an end away from the inner lock head. A second outer thread corresponding to the first inner thread inside the guide section, and the inner lock head is provided with an inner lock head locking groove.

The detachable concrete drill tap is connected with the guide section of the outer rod, the detachable concrete drill tap is composed of a joint section and a drill section connected with the joint section, and the joint section is provided with A third external thread corresponding to the first internal thread inside the guide segment, in addition, the drilling and tapping segment is provided with a cutting surface and a cutting tooth in sequence from the end away from the joint segment, and the cutting surface is formed by the first cutting surface. , a second cutting surface and a third cutting surface, and the included angles between the first cutting surface, the second cutting surface, the third cutting surface and the tip are all different.

In order to allow a more detailed understanding of the purpose, effect, features and structure of the present invention, preferred embodiments are given and described in conjunction with the drawings as follows.

First, please refer to FIGS. 1 to 6 , FIG. 1 is a schematic diagram of a rotary self-drilling screw with a detachable drill bit and a locking function according to the first aspect of the present invention, and FIG. 2 is a first aspect of the present invention with a detachable self-drilling screw An exploded schematic diagram of a rotary self-drilling screw with a drill bit and a locking function, FIG. 3 is a schematic diagram of the outer rod of the first aspect, FIG. A schematic diagram of the detachable metal plate drill tapping head, FIG. 6 is a partial enlarged schematic diagram of the detachable metal plate drilling tapping head in the first aspect.

The present invention produces two different forms according to the different materials of the drilling target. The first form of the present invention has a rotary self-drilling screw 1 with a detachable drill bit and a locking function, which is mainly used for drilling The tapping metal material includes a rod body 11 composed of an outer rod 111 , an inner rod 112 and a detachable metal plate drilling and tapping head 12 .

，又該潰曲段11123外表面上之排屑槽11121數量為螺牙段11122和導引段11124的兩倍以上。 As shown in FIGS. 2 to 4 , the outer rod 111 is composed of an outer lock head 1111 , an outer rod body 1112 connected to the outer lock head 1111 , and a through hole 1113 penetrating the outer lock head 1111 and the outer rod body 1112 . The outer surface of the outer rod body 1112 is provided with multiple helical chip removal grooves 11121, and the outer rod body 1112 is sequentially divided into screw segments 11122, crooked sections from the connection point with the outer lock head 1111 to the point away from the outer lock head 1111. Section 11123 and guide section 11124, wherein the screw thread section 11122 and the crimp section 11123 are provided with a first external thread 111221, and the crimp section 11123 is provided with a plurality of crooked grooves 111231 on the outer surface, and the crimp section 11123 The inner section of the curved section 11123 is designed to be a curved surface 111232 that is conducive to deformation and buckling, and the guide section 11124 is provided with a first internal thread 111241. In addition, the pitch of the chip flute 11121 is designed with the It gradually increases away from the outer screw head, and the angle of the inclination angle θ of the chip flute 11121 is:

, and the number of chip removal grooves 11121 on the outer surface of the curved section 11123 is more than twice that of the screw thread section 11122 and the guide section 11124 .

The inner rod 112 is disposed in the through hole 1113 of the outer rod 111. The inner rod 112 is composed of an inner lock head 1121 and an inner rod body 1122 connected with the inner lock head 1121, and the inner rod body 1122 is far from One end of the inner lock head 1121 is provided with a second outer thread 11221 corresponding to the first inner thread 111241 inside the guide section 11124, and the inner lock head 1121 is provided with an inner lock head locking groove 11211.

The detachable metal plate drilling and tapping head 12 is connected with the guide section 11124 of the outer rod 111 , and the detachable metal plate drilling and tapping head 12 is connected by the joint section 121 and the drilling section 122 connected with the joint section 121 . The engaging segment 121 is provided with a third external thread 1211 corresponding to the first internal thread 111241 inside the guiding segment 11124. In addition, the drilling and tapping segment 122 is provided with cuttings in sequence from one end away from the engaging segment 121. The surface 1221, the cutting teeth 1223 and the tapping thread 1224, as shown in FIG. 6, the cutting surface 1221 is composed of a first cutting surface 1221a, a second cutting surface 1221b, and a third cutting surface 1221c, and the first cutting surface 1221a, the first cutting surface 1221a, the third cutting surface 1221c The angles between the second cutting surface 1221b, the third cutting surface 1221c and the tip 1222 are all different and increase in the counterclockwise direction, and the angle between the first cutting surface 1221a and the tip 1222 is the angle between 301221b and the tip 1222 The included angle between 30.1~311221c and the tip 1222 is 31.1~321224 and there is also a chip guide groove 12241.

The detailed description of the first aspect of the present invention and related drawings for reference are as follows:

Please refer to FIGS. 7 and 8 together with FIGS. 3 and 4 . FIG. 7 is a schematic diagram (1) of implementing the present invention in the first aspect, and FIG. 8 is a schematic diagram (2) of implementing the present invention in the first aspect.

The present invention of the first aspect is mainly used for locking by using a hand-held power tool. When the present invention begins to drill and attack metal materials, the cutting sequence will be preferentially cut from the first cutting surface 1221a with the smallest included angle, and then the included angle is turned. The second largest second cutting surface 1221b, and finally the third cutting surface 1221c with the largest included angle turns, and the purpose of designing the cutting surface 1221 into three different included angles is to prevent the present invention from drilling with an oblique angle first when drilling and tapping. Turn right after attacking the metal.

Next, when the cutting surface 1221 cuts into the metal material, it is the turn of the cutting teeth 1223 to cut a hole that matches the diameter of the detachable metal plate drill tap 12, and then the tapping thread 1224 is used to cut a thread in the hole, and at the same time use The chip guide groove 12241 discharges the chips generated by the tapping.

Then, when the detachable metal plate drill tap 12 is completely drilled into the metal material, the guide section 11124 guides the outer rod 111 into the hole, and then the chips are discharged by the chip removal groove 11121. After the rod 111 is inserted to a certain depth and the first external thread 111221 touches the metal material, the first external thread 111221 will start to be screwed into the thread cut by the tapping thread 1224, and when the external rod 111 is rotated to the bottom and the external After the lock head 1111 is in contact with the surface of the metal material and the detachable metal plate drill tap 12 has completely penetrated the metal material, the inner rod 112 can be locked.

Finally, when the inner rod 112 is opened and rotated, the guide section 11124 will be pulled up and the crumpled section 11123 will be continuously squeezed. The crumpled groove 111231 and the design of the inner section with a curved surface 111232 can weaken the crumpled section 11123 The structural strength of the metal material makes the collapsed section 11123 easily deformed after being squeezed, and after the inner rod 112 is screwed into a certain depth, the deformed collapsed section 11123 will be stuck on the bottom surface of the metal material, thereby enabling the present invention to achieve a fixed The effect of metallic materials.

Please refer to FIGS. 9 to 12 in conjunction with FIGS. 3 and 4. FIG. 9 is a schematic diagram of a rotary self-drilling screw with a detachable drill bit and a locking function according to the second aspect of the present invention, and FIG. 10 is a second aspect. In this example, the present invention is an exploded schematic diagram of a rotary self-drilling screw with a detachable drill bit and a locking function. FIG. 11 is a schematic diagram of a detachable concrete drill tapping head in the second aspect, and FIG. Schematic diagram of the enlarged part of the concrete drill tapping head.

In addition, the second aspect of the present invention has a rotary self-drilling screw 1 with a detachable drill bit and a locking function, which is mainly used for drilling and tapping concrete materials, and includes an outer rod 111 and an inner rod 112. It is composed of the rod body 11 and the detachable concrete drilling and tapping head 13 .

，又該潰曲段11123外表面上之排屑槽11121數量為螺牙段11122和導引段11124的兩倍以上。 As shown in FIG. 3 and FIG. 4 , the outer rod 111 is composed of an outer lock head 1111 , an outer rod body 1112 connected to the outer lock head 1111 , and a through hole 1113 penetrating the outer lock head 1111 and the outer rod body 1112 . The outer surface of the outer rod body 1112 is provided with multiple helical chip removal grooves 11121, and the outer rod body 1112 is sequentially divided into screw segments 11122, crooked sections from the connection point with the outer lock head 1111 to the point away from the outer lock head 1111. Section 11123 and guide section 11124, wherein the screw thread section 11122 and the crimp section 11123 are provided with a first external thread 111221, and the crimp section 11123 is provided with a plurality of crooked grooves 111231 on the outer surface, and the crimp section 11123 The inner section of the curved section 11123 is designed to be a curved surface 111232 that is conducive to deformation and buckling, and the guide section 11124 is provided with a first internal thread 111241. In addition, the pitch of the chip flute 11121 is designed with the It gradually increases away from the outer screw head, and the angle of the inclination angle θ of the chip flute 11211 is:

, and the number of chip removal grooves 11121 on the outer surface of the curved section 11123 is more than twice that of the screw thread section 11122 and the guide section 11124 .

The inner rod 112 is disposed in the through hole 1113 of the outer rod 111. The inner rod 112 is composed of an inner lock head 1121 and an inner rod body 1122 connected with the inner lock head 1121, and the inner rod body 1122 is far from One end of the inner lock head 1121 is provided with a second outer thread 11221 corresponding to the first inner thread 111241 inside the guide section 11124, and the inner lock head 1121 is provided with an inner lock head locking groove 11211.

The detachable concrete drill tap 13 is connected with the guide section 11124 of the outer rod 111 , and the detachable concrete drill tap 13 is composed of a joint section 131 and a drill section 132 connected with the joint section 131 , The engaging section 132 is provided with a third external thread 1311 corresponding to the first internal thread 111241 inside the guiding section 11124. In addition, the drilling section 132 is provided with a cutting surface 1321 in sequence from the end away from the engaging section 131. and cutting teeth 1323, and the cutting surface 1321 is composed of a first cutting surface 1321a, a second cutting surface 1321b, and a third cutting surface 1321c, and the first cutting surface 1321a, the second cutting surface 1321b, and the third cutting surface 1321c The included angles with the tip 1322 are all different and increase in the counterclockwise direction, and the included angle between the first cutting surface 1321a and the tip 1322 is 30.1~311321c and the tip 1322 The included angle between 301321b and the tip 1322 The included angle is 31.1~32

Please refer to FIG. 13 and FIG. 14. FIG. 13 is a schematic diagram (1) of the implementation of the present invention in the second aspect, and FIG. 14 is a schematic diagram (2) of the implementation of the present invention in the second aspect.

The detailed description of the second aspect of the present invention and related drawings for reference are as follows:

The second aspect of the present invention is the same as the first aspect in use, and mainly uses a hand-held power tool for locking. When the present invention begins to drill and attack concrete, the cutting sequence will start from the first cutting surface 1321a with the smallest included angle. Priority is given to cutting, followed by the second cutting surface 1321b with the second largest included angle, and finally the third cutting surface 1321c with the largest included angle. It is not necessary to drill and tap the concrete at an oblique angle before turning it straight.

Then, when the cutting surface 1321 cuts into the concrete, it is the turn of the cutting teeth 1323 to cut a hole that conforms to the diameter of the detachable concrete drill tap 13. Then, when the detachable concrete drill tap 13 is completely drilled into the concrete, it will be guided by the guide. The guide section 11124 guides the outer rod 111 into the hole, and through the chip removal groove 11121, the debris generated by drilling and tapping the concrete is discharged out of the hole. After the head 1111 is in contact with the concrete surface, the inner rod 112 can be locked.

Then, when the inner rod 112 is opened and rotated, the guide section 11124 will be pulled upward and the crumpling section 11123 will be continuously squeezed. The crumpling groove 111231 and the design of the inner section with the curved surface 111232 can weaken the crumpling section. The structural strength of 11123 makes the collapsed section 11123 easily deformed after being squeezed, and the deformed collapsed section 11123 will continuously squeeze the inner wall of the hole.

Finally, when the inner rod 112 can no longer continue to rotate, it means that the deformed collapsed section 11123 has been in close contact with the inner wall of the hole, so that the present invention is stuck in the concrete.

Please refer to FIG. 15 and FIG. 16. FIG. 15 is a schematic diagram (1) of the implementation of the drill and tap without installation of the present invention, and FIG. 16 is a schematic diagram of the implementation of the drill and tap without installation of the present invention (2).

In addition, in the present invention, only the outer rod 111 and the inner rod 12 can be used alone, and only the outer rod 111 and the inner rod 112 can be used, and the hole must be pre-drilled in the metal material or concrete by using a drilling tool. , and then insert the outer rod 111 into the hole and rotate the inner rod 112 to deform the collapsed section 11123 and achieve a fixed effect.

Please refer to FIG. 17 and FIG. 18 together with FIG. 2 . FIG. 17 is a schematic diagram of the first adapter, and FIG. 18 is a schematic diagram of the second adapter.

In addition, both the first aspect and the second aspect of the present invention can be selected to be used with an adapter when locking, so that only the outer rod 111 or the inner rod can be rotated during the construction process. 112, instead of using power tools capable of rotating the outer rod 111 and the inner rod 112, respectively.

The design of the adapter can be the first adapter 3 shown in Figure 17, the two ends of which are cylinders composed of two hexagons of different sizes, and the larger end is used for pivoting The pivot section 33 of the power tool is connected, and the outer surface of the pivot section 33 is provided with a positioning bead 31 that can fix the first adapter 3 in the power tool sleeve, and the smaller end is used for inserting The inner locking head locks the groove 11211 and rotates the locking head 32 of the inner rod 112 .

In the case of using the above-mentioned first adapter 3, a power tool capable of rotating the outer lock head 1111 is selected and after the outer rod 111 is screwed into a metal material or concrete, the pivot section 33 is inserted into the sleeve of the power tool and the positioning is determined After the ball 31 fixes the adapter 3 in the sleeve, the locking head 32 can be inserted into the inner locking head locking groove 11211 and the inner rod 112 can be tightened to deform the collapsed section 11123 .

In addition, the adapter can also be a second adapter 4 as shown in FIG. 18 , which is composed of a hexagonal cylinder 42 for inserting into the locking groove 11211 of the inner lock head and rotating the inner rod 112 . The movable sleeve 43 that moves on the 42 and the positioning beads 41 located on the surface of the hexagonal cylinder 42 and used to fix the position of the movable sleeve 43 are formed. The movable sleeve 43 is provided with a hexagonal groove 431 corresponding to the size of the outer lock head 1111. .

In the case of using the above-mentioned second adapter 4, a sleeve with the same aperture as the inner lock head lock groove 11211 is selected, and after inserting the rear end of the hexagonal cylinder 42 into the sleeve, the hexagonal groove 431 is used to cover the outer lock. Head 1111 and screw the outer rod 111 into the metal material or concrete, then pull the movable sleeve 43 back and make the front end of the hexagonal cylinder 42 protrude from the movable sleeve 43, and finally push the hexagonal cylinder 42 out of the movable sleeve 43 Insert the inner lock head locking groove 11211 and start to tighten the inner rod 112 to deform the collapsed section 11123.

Please refer to FIGS. 19 and 20 together with FIGS. 5 and 11. FIG. 19 is a schematic diagram (1) of the first derivative aspect of the present invention, and FIG. 20 is a schematic diagram (2) of the first derivative aspect of the present invention.

In addition, the rod body 11 of the present invention can be a common screw, and the end of the screw is screwed with the third external thread 1211 on the joint section 121 of the detachable metal plate drilling and tapping head 12, or The end of the screw rod is screwed with the third external thread 1311 on the joint section 131 of the detachable concrete drilling and tapping head 13, so that the ordinary screw rod can be transformed into a drilling screw capable of drilling and tapping metal materials or concrete.

Therefore, the present invention has excellent progress and practicability among similar products, and at the same time, after searching domestic and foreign technical data and documents about such structures, it is true that no identical or similar structures exist before the application in this case. Therefore, this case The patent requirements for "creativeness", "suitability for industrial utilization" and "progressiveness" should be met, and the application should be filed in accordance with the law.

However, the above are only preferred embodiments of the present invention, and other equivalent structural changes made by applying the description of the present invention and the scope of the patent application should be included in the scope of the patent application of the present invention.

1: Rotary self-drilling screw with detachable drill bit and locking function 11: Rod body 111: Outer rod 1111: Outer lock 1112: Outer rod body 11121: Chip flutes 11122: Screw segment 111221: First external thread 11123: Collapse segment 111231: Crushing groove 111232: Surface 11124: Guide segment 111241: First female thread 1113: Through hole 112: Inner rod 1121: Inner lock 11211: Inner lock head lock slot 1122: Inner rod body 11221: Second external thread 12: Detachable metal plate drill tap 121:Joint segment 1211: Third external thread 122: Drilling section 1221: Cutting face 1221a: first cutting surface 1221b: Second cutting face 1221c: Third cutting face 1222: tip 1223: Cutting teeth 1224: Tapping thread 12241: Chip Guide 13: Detachable concrete drill tap 131:Joint segment 1311: Third external thread 132: Drilling section 1321: Cutting face 1321a: first cutting surface 1321b: Second cutting surface 1321c: Third cutting face 1322: tip 1323: Cutting teeth 2: Continuing components 21: External screw 22: Internal thread groove 3: The first adapter 31: Positioning Beads 32: locking head 33: Pivot section 4: The second adapter 41: Positioning Beads 42: Hexagonal Cylinder 43: Active sleeve 431: Hexagonal groove θ: tilt angle

Figure 1: Schematic diagram of a rotary self-drilling screw with a detachable drill bit and a locking function according to the first aspect of the present invention; Figure 2: The exploded schematic diagram of the rotary self-drilling screw with a detachable drill bit and a locking function according to the first aspect of the present invention; Figure 3: Schematic diagram of the outer rod in the first aspect; Figure 4: Schematic diagram of the cross-sectional view of the outer rod in the first aspect; Figure 5: Schematic diagram of the detachable metal plate drill tapping head of the first aspect; Figure 6: Partial enlarged schematic diagram of the detachable metal plate drill tapping head of the first aspect; Figure 7: Schematic diagram (1) of the implementation of the present invention in the first aspect; Figure 8: Schematic diagram (2) of the implementation of the present invention in the first aspect; 9: Schematic diagram of a rotary self-drilling screw with a detachable drill bit and a locking function according to the second aspect of the present invention; Figure 10: The second aspect of the present invention is an exploded schematic view of a rotary self-drilling screw with a detachable drill bit and a locking function; Figure 11: Schematic diagram of the detachable concrete drill tapping head in the second form; Figure 12: Partial enlarged schematic diagram of the detachable concrete drill tapping head of the second form; Figure 13: Schematic diagram (1) of the second aspect of the implementation of the present invention; Figure 14: Schematic diagram (2) of the implementation of the present invention in the second aspect; Figure 15: Schematic diagram (1) of the implementation of the drill-tapping head without installation of the present invention; Figure 16: Schematic diagram (2) of the implementation of the drill-tapping head without installation of the present invention; Figure 17: Schematic diagram of the first adapter; Figure 18: Schematic diagram of the second adapter; Figure 19: Schematic diagram of the first derivative aspect of the present invention; Figure 20: Schematic diagram of the second derivative aspect of the present invention.

none.

1: Rotary self-drilling screw with detachable drill bit and locking function

11: Rod body

111: Outer rod

112: Inner rod

12: Detachable metal plate drill tap

Claims (10)

A rotary self-drilling screw with a detachable drill bit and a locking function, which is composed of a rod body composed of an outer rod, an inner rod, and a detachable metal plate drilling and tapping head; The outer rod is composed of an outer lock head, an outer rod body connected with the outer lock head, and a through hole passing through the outer lock head and the outer rod body, and the outer surface of the outer rod is provided with multiple spiral chip removal grooves, And the outer rod body is divided into screw thread section, crooked section and guide section in sequence from the connection point with the outer lock head to the distance away from the outer lock head, wherein the screw thread section and the crooked section are provided with a first outer section. The outer surface of the crumpling section is provided with a plurality of creasing grooves, and the inner section of the crumpling section is a curved surface, and the guide section is internally provided with a first internal thread; The inner rod is arranged in the through hole of the outer rod, and the inner rod is composed of an inner lock head and an inner rod body connected with the inner lock head, and the inner rod body is provided with an end away from the inner lock head. a second outer thread corresponding to the first inner thread inside the guide section, and the inner lock head is provided with an inner lock head locking groove; The detachable metal plate drilling and tapping head is composed of a joint section and a drilling section connected with the joint section, and the joint section is provided with a third external thread corresponding to the first internal thread inside the guide section. , In addition, the drilling and tapping section is provided with a cutting surface, cutting teeth and tapping threads in sequence from the end away from the joint section, and the cutting surface is composed of a first cutting surface, a second cutting surface, and a third cutting surface, In addition, the included angles between the first cutting surface, the second cutting surface, the third cutting surface and the tip are all different, and the tapping thread is also provided with a chip guide groove. The rotary self-drilling screw with a detachable drill bit and a locking function according to claim 1, wherein the pitch of the chip removal groove gradually increases as it is farther away from the outer lock head, and the chip removal The angle of inclination of the groove is:

. The rotary self-drilling screw with a detachable drill bit and a locking function according to claim 1, wherein the number of chip flutes on the crumpling section is more than twice that of the screw thread section and the guide section. The rotary self-drilling screw with a detachable drill bit and a locking function according to claim 1, wherein the angle between the first cutting surface and the tip is 3030.1~3131.1~32 A rotary self-drilling screw with a detachable drill bit and a locking function, which is composed of a rod body composed of an outer rod, an inner rod and a detachable concrete drill tap; The outer rod is composed of an outer lock head, an outer rod body connected with the outer lock head, and a through hole passing through the outer lock head and the outer rod body, and the outer surface of the outer rod is provided with multiple spiral chip removal grooves, And the outer rod body is divided into screw thread section, crooked section and guide section in sequence from the connection point with the outer lock head to the distance away from the outer lock head, wherein the screw thread section and the crooked section are provided with a first outer section. The outer surface of the crumpling section is provided with a plurality of creasing grooves, and the inner section of the crumpling section is a curved surface, and the guide section is internally provided with a first internal thread; The inner rod is arranged in the through hole of the outer rod, and the inner rod is composed of an inner lock head, an inner rod body and an adapter section respectively connected with the inner lock head, and the inner rod body is far from the inner lock head. One end of the guide section is provided with a second external thread corresponding to the first internal thread inside the guide section; The detachable concrete drilling and tapping head is composed of a joint section and a drilling section connected with the joint section, and the joint section is provided with a third external thread screwed with the rod body. The end away from the joint section is sequentially provided with a cutting surface, cutting teeth and tapping threads, and the cutting surface is composed of a first cutting surface, a second cutting surface, and a third cutting surface, and the first cutting surface, the second cutting surface The included angles between the cutting surface, the third cutting surface and the tip are all different, and the tapping thread is also provided with a chip guide groove. The rotary self-drilling screw with a detachable drill bit and a locking function according to claim 5, wherein the pitch of the chip removal groove gradually increases as it is farther away from the outer lock head, and the chip removal The angle of inclination of the groove is:

. The rotary self-drilling screw with a detachable drill bit and a locking function as claimed in claim 5, wherein the number of chip flutes on the crumpling section is more than twice that of the thread section and the guide section. The rotary self-drilling screw with a detachable drill bit and a locking function according to claim 5, wherein the angle between the first cutting surface and the tip is 3030.1~3131.1~32 A rod body with a replaceable drill bit and a locking function, which is connected to the end of the rod body with a detachable metal plate drill tap; The rod system is a screw; The detachable metal plate drilling and tapping head is composed of a joint section and a drilling section connected with the joint section, and the joint section is provided with a third external thread screwed with the rod body. A cutting surface, cutting teeth and tapping threads are arranged in sequence from one end away from the joint section, and the cutting surface is composed of a first cutting surface, a second cutting surface, and a third cutting surface, and the first cutting surface, the third cutting surface The included angles between the second cutting surface, the third cutting surface and the tip are all different, and the tapping thread is also provided with a chip guide groove. A rod body with a replaceable drill bit and a locking function, which is connected to the end of the rod body with a detachable concrete drill tapping head; The rod system is a screw; The detachable concrete drilling and tapping head is composed of a joint section and a drilling section connected with the joint section, and the joint section is provided with a third external thread screwed with the rod body. The end away from the joint section is sequentially provided with a cutting surface, cutting teeth and tapping threads, and the cutting surface is composed of a first cutting surface, a second cutting surface, and a third cutting surface, and the first cutting surface, the second cutting surface The included angles between the cutting surface, the third cutting surface and the tip are all different, and the tapping thread is also provided with a chip guide groove.

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