TWI780510B - 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 refers to a rotary self-drilling screw with a detachable drill bit and a locking function.

General rivets and expansion screws are used to drill holes on the target with a hand-held drilling machine, and then put the rivets or expansion screws into the holes, and use a nail gun or electric wrench to fasten them. 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 In addition to the tools used, a lot of construction time can be saved.

In view of this, the applicant in this case conducted in-depth discussions on the above-mentioned deficiencies based on his years of research and development experience in related fields, and actively sought solutions based on the above-mentioned needs. After long-term hard research and multiple tests, he finally completed this project. invention.

The main purpose of the present invention is to provide a kind of drilling and tapping head of different types that can be arbitrarily installed and has the effect of expansion screws or rivets at the same time.

In order to achieve the above-mentioned 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 system is composed of an outer lock head, an outer rod body connected to 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 body is provided with multiple spiral chip removal grooves, And the outer rod body is sequentially divided into a thread section, a bent section and a guide section from the connection with the outer lock head to the system far away from the outer lock head, wherein, the thread section and the bent section are provided with a first outer There are multiple crooked grooves on the outer surface of the crooked section, and the internal cross section of the crooked section is designed to be a curved surface that is conducive to deformation and buckling, and a first internal thread is provided inside the guide section.

The inner rod system is arranged in the through hole of the outer rod, and the inner rod system 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 a The second external thread corresponds to the first internal thread inside the guide section, and the internal lock head is provided with an internal lock head lock groove.

The detachable sheet metal drilling head is connected with the guide section of the outer rod. The detachable sheet metal drilling 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 section. In addition, the drilling and tapping section is provided with a cutting surface, a cutting tooth and a tapping thread in sequence from the end far away from the joint section, and the cutting surface It is composed of the first cutting surface, the second cutting surface and the 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. It is mainly used for drilling concrete materials, and it includes a rod body composed of an outer rod and an inner rod. And detachable concrete drill bit.

The outer rod system is composed of an outer lock head, an outer rod body connected to 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 body is provided with multiple spiral chip removal grooves, And the outer rod body is sequentially divided into a thread section, a bent section and a guide section from the connection with the outer lock head to the system far away from the outer lock head, wherein, the thread section and the bent section are provided with a first outer There are multiple crooked grooves on the outer surface of the crooked section, and the internal cross section of the crooked section is designed to be a curved surface that is conducive to deformation and buckling, and a first internal thread is provided inside the guide section.

The inner rod system is arranged in the through hole of the outer rod, and the inner rod system 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 a The second external thread corresponds to the first internal thread inside the guide section, and the internal lock head is provided with an internal lock head lock groove.

The detachable concrete drilling head is connected with the guide section of the outer rod, the detachable concrete drilling head is composed of a joint section and a drilling section connected with the joint section, and the joint section is provided with The 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 and cutting teeth in sequence from the end away from the joint section, and the cutting surface is formed by the first cutting surface. , the second cutting surface, and the 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.

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

11: rod body

111: outer pole

1111: Outer lock

1112: outer rod body

11121: flutes

11122: thread segment

111221: The first external thread

11123: Crash section

111231: Crash groove

111232: Surface

11124: Guidance section

111241: The first internal thread

1113: through hole

112: inner rod

1121: inner lock head

11211: Inner lock slot

1122: inner rod body

11221: second external thread

12: Detachable sheet metal drilling head

121:Joint section

1211: The third external thread

122: Drilling and attacking section

1221: cutting surface

1221a: the first cutting surface

1221b: second cutting surface

1221c: the third cutting surface

1222: tip

1223: cutting tooth

1224: Tapping thread

12241: chip guide groove

13: Detachable concrete drilling head

131:Joint section

1311: The third external thread

132: Drilling and attacking section

1321: cutting surface

1321a: first cutting surface

1321b: second cutting surface

1321c: the third cutting surface

1322: tip

1323: cutting teeth

2: Connecting components

21: external screw

22: Internal screw 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: Movable sleeve

431: hexagonal groove

θ: tilt angle

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

In order to allow a more detailed understanding of the purpose, function, features and structure of the present invention, the preferred embodiments are described below with accompanying drawings.

First, please refer to Figures 1 to 6. Figure 1 is a schematic diagram of the first aspect of the invention with a detachable drill bit and a rotary self-drilling screw with a locking function. Figure 2 is a first aspect of the invention with a detachable drill bit. An exploded schematic diagram of a rotary self-drilling screw with a drill bit and a locking function. Figure 3 is a schematic diagram of the outer rod of the first aspect. Schematic diagram of the detachable metal plate drilling head, FIG. 6 is a partially enlarged schematic diagram of the detachable metal plate drilling head in the first form.

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 1 with a detachable drill bit and a locking function, which is mainly used for drilling. Tapping metal material, it system comprises the rod body 11 that is made up of outer rod 111, inner rod 112 and detachable type sheet metal drilling head 12 and is formed.

As shown in Figures 2 to 4, the outer rod 111 is composed of an outer lock head 1111, an outer rod body 1112 connected with the outer lock head 1111, and a through hole 1113 penetrating through the outer lock head 1111 and the outer rod body 1112, The outer surface of the outer rod body 1112 is provided with multiple spiral chip removal grooves 11121, and the outer rod body 1112 is sequentially divided into screw tooth segments 11122, crooked segments from the connection with the outer lock head 1111 to the outer lock head 1111 away from Section 11123 and guide section 11124, wherein, the screw thread section 11122 and the section 11123 are provided with first external threads 111221, and the outer surface of the section 11123 is provided with multiple sections of section 111231, and the section The internal section of the curved section 11123 is designed to be beneficial to produce a curved surface 111232 that is deformed and buckled, and the inside of the guide section 11124 is provided with a first internal thread 111241. In addition, the pitch of the chip removal groove 11121 is designed to follow It gradually increases away from the outer screw head, and the angle of inclination θ of the flute 11121 is: 60°-

The inner rod 112 is arranged in the through hole 1113 of the outer rod 111, and 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 away 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 lock groove 11211 .

The detachable metal sheet drilling head 12 is connected with the guide section 11124 of the outer rod 111, and the detachable metal sheet drilling head 12 is formed by the joint section 121 and the drilling section 122 connected with the joint section 121. Composition, and the third external thread 1211 corresponding to the first internal thread 111241 inside the guide section 11124 is provided on the joint section 121. In addition, the drilling section 122 is provided with cutting Surface 1221, cutting tooth 1223 and tapping thread 1224, as shown in Figure 6, the cutting surface 1221 is composed of the first cutting surface 1221a, the second cutting surface 1221b, the third cutting surface 1221c, and the first cutting surface 1221a, the second cutting surface 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, while the angle between the first cutting surface 1221a and the tip 1222 is 30°, and the angle between the second cutting surface 1221b between the tip 1222 The included angle is 30.1°~31°, the included angle between the third cutting surface 1221c and the tip 1222 is 31.1°~32°, and the tapping thread 1224 is also provided with a chip guide groove 12241.

The detailed description of the first aspect of the present invention and related drawings for reference is as follows: Please refer to Figures 7 and 8 together with Figures 3 and 4. Figure 7 shows the implementation of the first aspect of the present invention Schematic diagram (1), Fig. 8 is the schematic diagram (2) of implementing the present invention of the first aspect.

The present invention of the first aspect mainly uses hand-held electric tools to carry out locking in use. When the present invention starts to drill and attack metal materials, the cutting sequence will be cut first from the first cutting surface 1221a with the smallest included angle, and then to the included angle. The second largest second cutting surface 1221b is the third cutting surface 1221c with the largest included angle at last, and the purpose of designing the cutting surface 1221 into three different included angles is to allow the present invention to drill with an oblique angle when drilling. Tap the metal and then turn positive.

Then, when the cutting surface 1221 cuts into the metal material, it is the turn of the cutting tooth 1223 to cut out a hole that meets the diameter of the detachable metal plate drilling head 12, and then the thread is cut in the hole by the tapping thread 1224, and at the same time use The chip guide groove 12241 discharges the debris generated by tapping.

Again, when the detachable sheet metal drilling head 12 is fully drilled into the metal material, the outer rod 111 will be guided into the hole by the guide section 11124, and then the chips will be discharged by the chip removal groove 11121, and then the outer rod 111 will be used as the outer rod 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 screw into the thread cut by the tapping thread 1224, and when the external rod 111 turns to the end and the external Lock 1111 The inner rod 112 can be locked after the detachable sheet metal drilling head 12 has completely penetrated the metal material surface and is attached to the surface of the metal material.

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

Please refer to Figure 9 to Figure 12 together with Figure 3 and Figure 4. Figure 9 is a schematic diagram of the rotary self-drilling screw with a detachable drill bit and a locking function of the present invention in the second form, and Figure 10 is the second form The disassembly schematic diagram of the rotary self-drilling screw with detachable drill bit and locking function of the present invention, Figure 11 is a schematic diagram of the detachable concrete drilling head of the second aspect, and Figure 12 is the detachable concrete drill bit of the second aspect Partial enlarged schematic diagram of concrete drilling and 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. It is mainly used for drilling and tapping concrete materials. It is composed of an outer rod 111 and an inner rod 112. The rod body 11 and the detachable concrete drilling head 13 are formed.

As shown in Figures 3 and 4, the outer rod 111 is composed of an outer lock head 1111, an outer rod body 1112 connected with 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 spiral chip removal grooves 11121, and the outer rod body 1112 is sequentially divided into screw tooth segments 11122, crooked segments from the connection with the outer lock head 1111 to the outer lock head 1111 away from Section 11123 and guide section 11124, wherein, the screw thread section 11122 and the section 11123 are provided with first external threads 111221, and the outer surface of the section 11123 is provided with multiple sections of section 111231, and the section The internal section of the curved section 11123 is designed to be beneficial to produce a curved surface 111232 that is deformed and buckled, and the inside of the guide section 11124 is provided with a first internal thread 111241. In addition, the pitch of the chip removal groove 11121 is designed to follow It gradually increases away from the outer screw head, and the angle of inclination θ of the flute 11211 is: 60°-

The inner rod 112 is arranged in the through hole 1113 of the outer rod 111, and 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 away 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 lock groove 11211 .

The detachable concrete drilling head 13 is connected with the guide section 11124 of the outer rod 111, and the detachable concrete drilling head 13 is composed of a joint section 131 and a drilling section 132 connected with the joint section 131, The engaging section 131 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 sequentially from the end away from the engaging section 131. And the cutting teeth 1323, and the cutting surface 1321 is composed of the first cutting surface 1321a, the second cutting surface 1321b, and the third cutting surface 1321c, and the first cutting surface 1321a, the second cutting surface 1321b, and the third cutting surface 1321c The included angles between the first cutting surface 1321a and 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°, the angle between the second cutting surface 1321b and the tip 1322 is 30.1°-31°, the angle between the third cutting surface 1321c and the tip 1322 is 31.1°-32°.

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

The detailed description of the second aspect of the present invention and related drawings for reference is as follows: the second aspect of the present invention is the same as the first aspect in use, mainly using hand-held electric tools to carry out Lock design, when the present invention starts to drill and attack concrete, the cutting sequence will be the first cutting surface 1321a with the smallest included angle to cut first, then the second cutting surface 1321b with the second largest included angle, and finally the third with the largest included angle. The cutting surface 1321c, and the purpose of designing the cutting surface 1321 into three different angles is to allow the present invention to drill and attack concrete at an oblique angle before turning to a normal position.

Then, when the cutting surface 1321 cuts into the concrete, it is the turn of the cutting tooth 1323 to cut out the hole that meets the diameter of the detachable concrete drilling head 13, and then the detachable concrete drilling head 13 will be drilled into the concrete completely. The guide section 11124 guides the outer rod 111 into the hole, and then through the chip removal groove 11121, the debris generated by drilling and tapping the concrete is discharged out of the hole, and when the detachable concrete drilling head 13 drills to a certain depth and the outer lock After the head 1111 is attached to the concrete surface, the inner rod 112 can be locked.

Again, when the inner rod 112 is turned, the guide section 11124 will be pulled upwards and the buckling section 11123 will be continuously squeezed, while the buckling groove 111231 and the design of the curved surface 111232 in the inner section can weaken the buckling section The structural strength of 11123 makes the buckling section 11123 is easily deformed after being squeezed, and the deformed section 11123 will constantly squeeze the inner wall of the hole.

Finally, when the inner rod 112 cannot continue to rotate, it means that the deformed buckling section 11123 has closely adhered to the inner wall of the hole, and then the present invention is stuck in the concrete.

Please refer to Fig. 15 and Fig. 16. Fig. 15 is a schematic view (1) of the implementation of the drilling head without installation of the present invention, and Fig. 16 is a schematic diagram (2) of the implementation of the drilling head without installation of the present invention.

Again, the present invention can only use the outer rod 111 and the inner rod 12 separately in use, and only use the outer rod 111 and the inner rod 112, and then it is necessary to utilize the drilling machine to drill holes in advance on metal materials or concrete. , and then insert the outer rod 111 into the hole and rotate the inner rod 112 to deform the crooked 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, whether it is the first aspect or the second aspect of the present invention, it can be used with an adapter when locking, so that only the outer rod 111 or the inner rod can be rotated during construction. 112 instead of using power tools that can rotate the outer rod 111 and the inner rod 112 respectively.

And this adapter can be designed as the first adapter 3 shown in Figure 17, its two ends are cylinders formed by two hexagons of different sizes, and the larger end is used for pivoting. Connect the pivotal section 33 of the electric tool, and the outer surface of the pivotal section 33 is provided with a positioning bead 31 that can fix the first adapter 3 in the sleeve of the electric tool, and the smaller end is used for inserting The inner locking head lock groove 11211 and rotate the locking head 32 of the inner rod 112 .

The situation of using the above-mentioned first adapter 3 is to select an electric tool capable of rotating the outer lock head 1111 and screw the outer rod 111 into metal material or concrete, then insert the pivot section 33 into the sleeve of the electric tool and determine the positioning After the bead 31 fixes the adapter 3 in the sleeve, the locking head 32 can be inserted into the inner locking groove 11211 and the inner rod 112 can be tightened to deform the buckling section 11123 .

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

The situation of using the above-mentioned second adapter 4 is to select a sleeve consistent with the aperture of the inner lock head lock groove 11211, insert the rear end of the hexagonal cylinder 42 into the sleeve, and then use the hexagonal groove 431 to cover the outer lock. Head 1111 and the outer rod 111 is screwed into the metal material or concrete, then the movable sleeve 43 is pulled back and the front end of the hexagonal cylinder 42 protrudes from the movable sleeve 43, and finally the hexagonal cylinder 42 protruding from the movable sleeve 43 Insert the inner lock head lock slot 11211 and begin to tighten the inner rod 112 to deform the buckled section 11123.

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

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

Therefore, the present invention has excellent advancement and practicability among similar products. At the same time, after checking the technical data and documents about this type of structure at home and abroad, it is true that no identical or similar structure exists before the application of this case. Therefore, this case Should have met the patent requirements of "creativity", "suitability for industrial utilization" and "progressiveness", the application should be filed in accordance with the law.

Only, what is described above is only a preferred embodiment of the present invention, and all 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 pole

112: inner rod

12: Detachable sheet metal drilling head

Claims (8)

A rotary self-drilling screw with a detachable drill bit and a locking function, which consists of a rod body composed of an outer rod, an inner rod, and a detachable metal plate drilling head; the outer rod is composed of The outer lock head, the outer rod body connected with the outer lock head and the through hole passing through the outer lock head and the outer rod body, and the outer surface of the outer rod body is provided with multiple spiral chip removal grooves, and the outer rod body is formed from From the connection with the outer lock head to the system far away from the outer lock head, it is divided into a thread section, a buckle section and a guide section in sequence, wherein the thread section and the buckle section are provided with first external threads, and the buckle section There are multiple crooked grooves on the outer surface, and the inner section of the crooked section is a curved surface, and the first internal thread is provided inside the guide section; the inner rod is set in the through hole of the outer rod, the The inner rod system 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 a second thread corresponding to the first internal thread inside the guide section on the end away from the inner lock head. external thread, and the inner lock head is provided with an inner lock groove; the detachable metal plate drilling head is composed of a joint section and a drilling section connected with the joint section, and the joint section is provided with and The first internal thread inside the guide section corresponds to the third external thread. 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 formed by the first Composed of a 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, and the tapping thread is also provided with With chip guide. The rotary self-drilling screw with a detachable drill bit and a locking function as described in claim 1, wherein the pitch of the chip removal groove increases gradually as it is farther away from the outer lock head, and the chip removal The inclination angle of the groove is:

. The rotary self-drilling screw with a detachable drill bit and a locking function as described in claim 1, wherein the angle between the first cutting surface and the tip is 30°, and the angle between the second cutting surface and the tip is The included angle is 30.1°~31°, and the included angle between the third cutting surface and the tip is 31.1°~32°. A rotary self-drilling screw with a detachable drill bit and a locking function, which consists of a rod body composed of an outer rod, an inner rod, and a detachable concrete drilling head; The lock head, the outer rod body connected with the outer lock head and the through hole passing through the outer lock head and the outer rod body, and the outer surface of the outer rod body is provided with multiple spiral chip removal grooves, and the outer rod body is connected with the outer rod body. From the joint of the outer lock head to the system far away from the outer lock head, it is sequentially divided into a thread segment, a crooked segment and a guide segment, wherein the screw thread segment and the crooked segment are provided with first external threads, and the outer crimped segment There are multiple crooked grooves on the surface, and the inner section of the crooked section is a curved surface, and the first internal thread is provided inside the guide section; the inner rod is set in the through hole of the outer rod, and the inner rod The rod system is composed of the inner lock head, the inner rod body connected with the inner lock head and the transition section, and the inner rod body is provided with the first internal thread in the guide section on the end far away from the inner lock head. The corresponding second external thread; the detachable concrete drilling 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, In addition, the drilling and tapping section is provided with cutting surfaces and cutting teeth in sequence from the end away from the joint section, and the The cutting surface is composed of the first cutting surface, the second cutting surface and the 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. The rotary self-drilling screw with a detachable drill bit and a locking function as described in claim 4, wherein the pitch of the chip removal groove increases gradually as it is farther away from the outer lock head, and the chip removal The inclination angle of the groove is:

. The rotary self-drilling screw with a detachable drill bit and a locking function as described in claim 4, wherein the angle between the first cutting surface and the tip is 30°, and the angle between the second cutting surface and the tip is The included angle is 30.1°~31°, and the included angle between the third cutting surface and the tip is 31.1°~32°. A rod body with a replaceable drill bit and a locking function, which is attached to a detachable metal plate drilling head at the end of the rod body; the rod system is a screw rod; the detachable metal plate drilling head is composed of The joint section and the drilling section connected with the joint section are composed of a third external thread screwed with the rod body. In addition, the drilling section is provided with cutting surfaces in sequence from the end away from the joint section. , cutting teeth and tapping threads, and the cutting surface is composed of the first cutting surface, the second cutting surface, and the third cutting surface, and between the first cutting surface, the second cutting surface, the third cutting surface and the tip The clamping angles are different, and the tapping thread is also provided with chip guide grooves. A rod body with a replaceable drill bit and a locking function, which is tied to a detachable concrete drilling head at the end of the rod body; the rod system is a screw rod; The detachable concrete drilling 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. In addition, the drilling section is self-contained. The end away from the joint section is provided with a cutting surface and cutting teeth in sequence, 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 third cutting surface and the tip are all different.

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