CN219774552U

CN219774552U - Fastening connecting piece

Info

Publication number: CN219774552U
Application number: CN202320399631.XU
Authority: CN
Inventors: 曹飞
Original assignee: Suzhou Nianlun Metal Product Co ltd
Current assignee: Suzhou Nianlun Metal Product Co ltd
Priority date: 2023-03-06
Filing date: 2023-03-06
Publication date: 2023-09-29
Anticipated expiration: 2033-03-06

Abstract

The utility model relates to the technical field of fixed members used for equipment parts, in particular to a fastening connecting piece, which comprises an internal thread fastening piece, wherein the lower surface of the internal thread fastening piece is fixedly connected with a joint round platform piece, the middle part of the lower surface of the joint round platform piece is fixedly connected with an umbrella tooth drill tail connecting piece, and the fastening connecting piece is provided with the internal thread fastening piece and the joint round platform piece with the same structure; this a fastening connecting piece structure for installing photovoltaic support, through being provided with internal thread fastener and linking round platform piece structure, realized constructing the process operation that the sediment was fallen in the trompil was avoided to the photovoltaic in-process on steel construction waterproof roofing, and can increase EPDM waterproof pad, the function of resistant glue that falls at linking round platform piece lower surface, reached and prevented that the screw is not hard up, roof falls the sediment when the trompil, prevent to leak, and the effect of internal thread fastener internal connection photovoltaic support simple structure, and can reduce the cost of labor effectively, more efficient completion construction progress.

Description

Fastening connecting piece

Technical Field

The utility model relates to the technical field of fixing members used for equipment parts, in particular to a fastening connecting piece.

Background

The fastening connecting piece is a connecting part for fastening mechanical equipment, wall decoration and electric appliance installation, as is well known, the photovoltaic bracket is installed at the top of a building, a hole puncher is generally adopted to punch holes on an original roof base layer, the photovoltaic bracket is connected to the top of a house through the fastening connecting piece, the working procedure is too complicated, time and labor are consumed in the construction process, the heights of roof hanging pieces in the factory building cannot be unified, the storage capacity of products becomes large due to the fact that the thickness of a heat-insulating layer in a heat-insulating system of each factory building in a roof system is different, the problem that a steel structure roof falls off a profiled steel plate iron block when the hole is broken in the process of punching a steel structure roof is solved, and owners of workshops of many precise instruments are forced to accept the current construction technology only; wherein, the line mark pulling force of the fastening connection piece is 2200N.m.

For example, patent number CN201820785065.5 discloses a connecting structure for a photovoltaic bracket and a color steel plate roof, which comprises a connecting piece, a color steel plate protruding part, a clamping groove, a limiting boss and a connecting hole structure, wherein the photovoltaic bracket is installed on a horizontal part by utilizing a plurality of connecting pieces, and the color steel plate protruding part on the roof is fixed on the connecting piece for fixedly connecting the photovoltaic bracket and avoiding house water leakage; patent number CN202210069855.4 discloses a connecting piece for flexible support dual glass assembly, including clamping component, supporting component, fixed subassembly, photovoltaic module, fixed position, rack, hole, bolt hole and connecting portion structure are constituteed, through increasing supporting component and fixed subassembly between clue and photovoltaic module for increase the interval between clue and photovoltaic module, reduce the shielding function to photovoltaic module, but have the lower and problem that leaks of drawing force.

Therefore, both the above two patent utility models disclose fastening connectors for photovoltaic brackets, and there are problems that the mounting is complicated, time-consuming and labor-consuming due to the complicated structure of the connectors, and the pulling force of the connectors is low.

Disclosure of Invention

The present utility model is directed to a fastening connector, which solves the above-mentioned technical problems in the prior art.

In order to achieve the above purpose, the utility model discloses a fastening connector, which comprises an internal thread fastener, wherein the lower surface of the internal thread fastener is fixedly connected with a joint round platform piece, the middle part of the lower surface of the joint round platform piece is fixedly connected with a cusp tail cutting connector, and for the fastening connector with the same structure of the internal thread fastener and the joint round platform piece, the type of the fastening connector comprises a cusp tail cutting connector which is fixedly connected with the middle part of the lower surface of the joint round platform piece; a dental drill tail connecting piece is fixedly connected to the middle part of the lower surface of the connecting round table piece; the middle part of the lower surface of the connecting round table piece is fixedly connected with an umbrella tooth soup spoon tail part; the middle part positioned on the lower surface of the connecting round table piece is fixedly connected with an umbrella tooth drill tail piece; and the middle part positioned on the lower surface of the connecting round table piece is fixedly connected with a triangular tooth drilling tail piece.

Optionally, the structure of the internal thread fastener comprises a hexagon head, a cylindrical bottom taper hole is formed in the middle of the upper surface of the hexagon head, and a rotary thread groove is formed in the inner wall of the cylindrical bottom taper hole; the structure of the cusp tail cutting connecting piece comprises a first screw rod, the lower surface of the first screw rod is fixedly connected with a cusp tail cutting end, and the outer wall of the first screw rod, which is positioned at the outer wall of the cusp tail cutting end, is fixedly connected with a first thread strip.

Optionally, the structure of the tooth horizontal tail connecting piece comprises a second screw rod, and the outer wall of the second screw rod is fixedly connected with a second thread strip; the structure of the dental drill tail connecting piece comprises a third screw rod, wherein the outer wall of the third screw rod is fixedly connected with a third thread strip, and the lower surface of the third screw rod is fixedly connected with the dental drill tail end; the structure of the umbrella tooth soup spoon tail part comprises a fourth screw rod, wherein the outer wall of the fourth screw rod is fixedly connected with a fourth thread strip, and the lower surface of the fourth screw rod is fixedly connected with the umbrella tooth soup spoon tail part; the structure of the umbrella dental drill tail piece comprises a fifth screw rod, wherein the outer wall of the fifth screw rod is fixedly connected with a fifth thread strip, and the lower surface of the fifth screw rod is fixedly connected with the tail part of the umbrella dental drill; the triangular tooth drill tail part comprises a sixth screw rod, wherein a sixth thread strip is fixedly connected to the outer wall of the sixth screw rod, and the lower surface of the sixth screw rod is fixedly connected with the triangular tooth drill tail part.

Optionally, the shape and the size of the first thread strip, the second thread strip and the third thread strip are the same, the shape and the size of the fourth thread strip and the shape and the size of the fifth thread strip are the same, and the shape and the size of the first thread strip are different from the shape and the size of the fourth thread strip, so that the roof scraps are prevented from falling and the photovoltaic bracket is firmly connected.

Optionally, the shape of the inner space of the cylindrical bottom taper hole is a combination of a cylinder and a cone, the shape of the inner space of the rotary thread groove is a cylinder, the length dimension of the hexagonal head is in the range of 14-15mm, the diameter dimension of the cylindrical bottom taper hole is 8mm, and the depth dimension of the rotary thread groove is in the range of 14-15mm, so as to describe the size of the fastening connection piece.

Optionally, the thickness dimension scope of linking round platform piece is 1.6-2mm, the diameter dimension scope of linking round platform piece is 16-17mm, just the middle part of linking round platform piece lower surface has the ring recess for increase EPDM waterproof pad, resistant glue that falls, can effectively stop roofing trompil position weeping and can prevent the not hard up phenomenon of screw trompil position.

Optionally, the length dimension of the fifth screw (701) is 23-25mm, the length dimension of the fifth screw dental drill tail (703) is 5-7mm, the diameter dimension of the umbrella dental drill tail piece is 7-7.1mm, no scrap iron is removed in the process of tapping the umbrella dental drill tail on a roof steel structure profiled steel plate, the tooth-shaped cross section of the fifth screw thread is umbrella-shaped, the degree of tooth angle of the fifth screw thread is 35-40 degrees, the tooth-shaped cross section of the fourth screw thread is umbrella-shaped, the degree of tooth angle of the fourth screw thread is 35-40 degrees, and the purpose is to design special screw teeth for improving the drawing force F.

Optionally, the length dimension of the second screw rod is equal to the sum of the length dimensions of the first screw rod and the cutting tail end of the dental drill tail end, the outer wall of the dental drill tail end is not fixedly connected with the third thread strip, the dental drill tail end, the umbrella dental soup spoon tail end, the triangular dental drill tail end and the length dimension of the umbrella dental drill tail end are equal to the length dimension of the cutting tail end of the dental drill, and the purpose is to improve the tightness of connecting the photovoltaic bracket.

Advantageous effects

Compared with the prior art, the utility model has the following advantages:

1. in the fastening connecting piece structure, through being provided with internal thread fastener and linking round platform piece structure, realized building the photovoltaic in-process on steel construction waterproof roofing, the connected action between screw on photovoltaic base and the steel construction profiled sheet, and can increase EPDM waterproof pad, the function of resistant glue that falls at linking round platform piece lower surface, can effectively stop roofing trompil position water leakage and can prevent the screw in the not hard up phenomenon of trompil position, and the effect of internal thread fastener internal connection photovoltaic support simple structure, more convenient and the step is less on the operation process, can reduce the cost of labor effectively, more efficient completion construction progress.

2. In this fastening connecting piece structure, through setting up the structural style of internal thread fastener connecting piece to umbrella tooth brill tail spare, realized being connected between screw and the photovoltaic base on the steel construction profiled sheet, the function of steel construction profiled sheet iron plate can not drop in the attack in-process can be reached simultaneously and the drawing force effect that promotes the fastening connecting piece, and the drawing force can promote to more than 2500 N.m, and F is greater than or equal to 2500 N.m, and in the formula, N represents as the ox, 1 kilogram = 9.8 ox.

Drawings

Fig. 1 is a schematic structural view of a fastening connector of embodiment 1.

Fig. 2 is a schematic structural view of the fastening connector of embodiment 2.

Fig. 3 is a schematic structural view of the fastening connector of embodiment 3.

Fig. 4 is a schematic structural view of the fastening connector of embodiment 4.

Fig. 5 is a schematic structural view of the fastening connector of embodiment 5.

Fig. 6 is a schematic structural view of the fastening connector of embodiment 6.

The reference numerals are: 1. an internally threaded fastener; 101. a hexagonal head; 102. cylindrical bottom taper hole; 103. rotating the thread groove; 2. joining round table sheets; 3. a cusp tail cutting connector; 301. a first screw; 302. a first thread; 303. cutting the tail end of the tooth tip; 4. a dental horizontal tail connector; 401. a second screw; 402. a second thread; 5. a dental drill tail connector; 501. a third screw; 502. a third thread; 503. the tail end of the dental drill; 6. an umbrella tooth soup spoon tail part; 601. a fourth screw; 602. a fourth thread; 603. tail of umbrella tooth soup spoon; 7. an umbrella tooth drilling tail piece; 701. a fifth screw; 702. a fifth thread; 703. the tail part of the umbrella dental drill; 8. triangular tooth drilling tail piece; 801. a sixth screw; 802. a sixth thread; 803. the tail of the triangular dental drill.

Detailed Description

The technical scheme of the utility model is explained in detail by specific examples.

Example 1

Referring to fig. 1, the utility model discloses a fastening connecting piece, which comprises an internal thread fastening piece 1, wherein the lower surface of the internal thread fastening piece 1 is fixedly connected with a round table piece 2, the middle part of the lower surface of the round table piece 2 is fixedly connected with a cusp tail cutting connecting piece 3, the structure of the internal thread fastening piece 1 comprises a hexagonal head 101, the middle part of the upper surface of the hexagonal head 101 is provided with a cylindrical bottom taper hole 102, the inner wall of the cylindrical bottom taper hole 102 is provided with a rotary thread groove 103, the structure of the cusp tail cutting connecting piece 3 comprises a first screw 301, the lower surface of the first screw 301 is fixedly connected with a cusp tail cutting piece 303, and the outer walls of the cusp tail cutting piece 303 are fixedly connected with first thread strips 302.

In a preferred embodiment, the shape of the inner space of the cylindrical bottom cone hole 102 is a combination of a cylinder and a cone, the shape of the inner space of the rotary thread groove 103 is a cylinder, the inner space is used for fastening and connecting the bottom surface part of the photovoltaic bracket, the length dimension of the hexagonal head 101 is in the range of 14-15mm, the diameter dimension of the cylindrical bottom cone hole 102 is 8mm, and the depth dimension of the rotary thread groove 103 is in the range of 14-15mm, so as to describe the size of the fastening connection piece, and the connection function of the screw on the steel structure dental steel plate and the photovoltaic base is achieved.

In a preferred embodiment, the thickness dimension range of the linking round platform piece 2 is 1.6-2mm, the diameter dimension range of the linking round platform piece 2 is 16-17mm, and the middle part of the lower surface of the linking round platform piece 2 is provided with a circular ring groove for adding an EPDM waterproof pad and resisting glue falling, so that water leakage at the opening position of a roof can be effectively avoided, and loosening phenomenon of screws at the opening position can be prevented, wherein the glue falling resistance is in the rotating process, friction heating is carried out, the glue can be melted, and the glue is stuck on a roof after cooling and solidifying, so that loosening of the screws can be effectively prevented.

In a preferred embodiment, the total length of the first screw 301 and the cusp tail 303 is 30-32mm, so as to improve the tightness of the connection photovoltaic bracket, and the phenomenon of wire slipping is not easy to occur.

Working principle: the staff is at the lower surface that links up round platform piece 2, pass waterproof pad through the tooth point tail end 303, the top of first screw rod 301 is carried to the resistant cushion that falls, need advance carry out the pre-tapping on the roofing steel construction profiled sheet in house, first screw rod 301, first screw thread strip 302 and tooth point tail 303 bore the roofing steel construction profiled sheet in house, cup joint the steel construction profiled sheet at the hexagon 101 with the help of the hex bit, only spill the part that links up round platform piece 2 and female screw fastener 1 with first screw thread strip 302, the constructor will connect the screw rod screw in hexagon 101 inside cylinder end taper hole 102 of steel construction profiled sheet and photovoltaic base, match the size of rotatory thread groove 103 and twist the connection, finally expose the photovoltaic base at the house top, utilize welder to weld the waterproofing membrane of photovoltaic base self-tape and the original waterproofing membrane of roofing, the screw rod screw in hot-blast photovoltaic base of connection and photovoltaic guide rail is used again and the photovoltaic guide rail is reserved in the middle of carrying out the final step and is fixed, its tail force of drawing umbrella 7 and tooth tail piece 6 after the numerical value of tooth point is bored.

Example 2

Referring to fig. 2, the utility model discloses a fastening connector, which comprises an internal thread fastener 1, wherein the lower surface of the internal thread fastener 1 is fixedly connected with a round engagement platform 2, the middle part of the lower surface of the round engagement platform 2 is fixedly connected with a tooth horizontal tail connector 4, the structure of the tooth horizontal tail connector 4 comprises a second screw rod 401, and the outer wall of the second screw rod 401 is fixedly connected with a second thread strip 402.

In a preferred embodiment, the sum of the length dimensions of the second screws 401 and 402 is equal to the sum of the length dimensions of the first screw 301 and the cusp tail 303, so as to improve the tightness of the connection to the photovoltaic bracket, and to prevent the occurrence of the slipping phenomenon.

The working principle is the same as in the embodiment 1, the drawing force is not high by the numerical value of the umbrella tooth drill tail piece 7 and the umbrella tooth spoon tail piece 6.

Example 3

Referring to fig. 3, the utility model discloses a fastening connector, which comprises an internal thread fastener 1, wherein the lower surface of the internal thread fastener 1 is fixedly connected with a round engagement platform 2, the middle part of the lower surface of the round engagement platform 2 is fixedly connected with a dental drill tail connector 5, the structure of the dental drill tail connector 5 comprises a third screw 501, the outer wall of the third screw 501 is fixedly connected with a third thread 502, and the lower surface of the third screw 501 is fixedly connected with a dental drill tail 503.

In a preferred embodiment, the first thread strips 302, 402 and the third thread strip 502 are identical in shape and size, and have the functions of fastening the connecting bracket, facilitating disassembly, avoiding complex installation procedures and avoiding slag falling of the roof opening when the photovoltaic bracket is installed, and are used for preventing the roof from falling scraps and fastening the photovoltaic bracket.

The working principle of the photovoltaic module is the same as that of the embodiment 1, and the photovoltaic module is characterized in that a third screw 501, a third thread 502 and a dental drill tail 503 are directly drilled into a roof steel structure profiled steel plate of a house, the third thread 502 is rotatably drilled into the steel structure profiled steel plate of the roof by means of a hexagonal drill bit sleeved on the outer wall of the hexagonal head 101, only the part which is connected with a round table piece 2 and an internal thread fastener 1 is leaked out, a constructor screws a screw on the steel structure profiled steel plate and a screw on a photovoltaic base into a cylindrical bottom taper hole 102 in the hexagonal head 101, the size of a rotary thread groove 103 is matched for screwing connection, the photovoltaic base is finally exposed at the top of the house, a waterproof coiled material of the photovoltaic base and an original waterproof coiled material of the roof are welded by a hot air welding gun, the final step is fixed by means of screwing the screw on an internal thread of the photovoltaic base and a reserved hole of the photovoltaic guide rail by means of the screw, and the drawing force of the photovoltaic drill tail piece 7 and the dental drill tail piece 6 is not high in value.

Example 4

Referring to fig. 4, the utility model discloses a fastening connector, which comprises an internal thread fastener 1, wherein the lower surface of the internal thread fastener 1 is fixedly connected with a round table connecting piece 2, the middle part of the lower surface of the round table connecting piece 2 is fixedly connected with an umbrella tooth soup spoon tail part 6, the structure of the umbrella tooth soup spoon tail part 6 comprises a fourth screw 601, the outer wall of the fourth screw 601 is fixedly connected with a fourth thread strip 602, and the lower surface of the fourth screw 601 is fixedly connected with an umbrella tooth soup spoon tail part 603.

In a preferred embodiment, the shape and size of the first thread 302 are different from those of the fourth thread 602, the cross-section of the tooth shape of the fourth thread 602 is umbrella-shaped, the degree of the tooth angle is 35-40 °, the diameter size of the tail drilling element 6 of the umbrella tooth is 7-7.1mm, the purpose is to design special threads for improving the drawing force F, and through test F being equal to or greater than 3500N, N is expressed as cow, 1 kg=9.8 cow, the drawing force directions played by different threads are different, and the magnitude of the drawing force is different.

The working principle of the photovoltaic module is the same as that of the embodiment 1, and the photovoltaic module is characterized in that a fourth screw 601, a fourth thread 602 and an umbrella tooth soup spoon drill tail 603 are directly drilled into a roof steel structure profiled steel plate of a house, the fourth thread 602 is rotationally drilled into the steel structure profiled steel plate of the roof by means of a hexagonal drill bit sleeved on the outer wall of a hexagonal head 101, only the part which is connected with a round table piece 2 and an internal thread fastener 1 is leaked out, a constructor screws a screw for connecting the steel structure profiled steel plate with a photovoltaic base into a cylindrical bottom taper hole 102 in the hexagonal head 101, the size of a rotary thread groove 103 is matched for screwing connection, the photovoltaic base is finally exposed at the top of the house, a waterproof coiled material carried by the photovoltaic base and an original waterproof coiled material of the roof are welded by a hot air welding gun, and then the screw for connecting the photovoltaic base and a photovoltaic guide rail is screwed into an internal thread of the photovoltaic base and a photovoltaic guide rail reserved hole for final step fixing.

Example 5

Referring to fig. 5, the utility model discloses a fastening connector, which comprises an internal thread fastener 1, wherein the lower surface of the internal thread fastener 1 is fixedly connected with a round joint plate 2, the middle part of the lower surface of the round joint plate 2 is fixedly connected with an umbrella dental drill tail part 7, the structure of the umbrella dental drill tail part 7 comprises a fifth screw 701, the outer wall of the fifth screw 701 is fixedly connected with a fifth thread 702, and the lower surface of the fifth screw 701 is fixedly connected with an umbrella dental drill tail part 703.

In a preferred embodiment, the shape and size of the first thread 302 are different from those of the fifth thread 702, the profile cross-section of the fifth thread 702 is umbrella-shaped, the degree of the profile angle is 35-40 °, the diameter size of the tail part 7 of the umbrella thread is 7-7.1mm, the purpose is to design special threads for improving the drawing force F, and through test F is greater than or equal to 3500N, where N is expressed as cow, 1 kg=9.8 cow, the drawing force directions played by different threads are different, and the magnitude of the drawing force is different.

The working principle of the photovoltaic module is the same as that of the embodiment 1, and the photovoltaic module is characterized in that a fifth screw 701, a fifth thread 702 and an umbrella dental drill tail 703 are directly drilled into a roof steel structure profiled steel plate of a house, the fifth thread 702 is sleeved on the outer wall of a hexagonal head 101 by means of a hexagonal drill bit, the steel structure profiled steel plate of the roof is rotationally drilled, only the part which is connected with a round table piece 2 and an internal thread fastener 1 is leaked, a constructor screws a screw on the steel structure profiled steel plate and a screw on a photovoltaic base into a cylindrical bottom taper hole 102 in the hexagonal head 101, the size of a rotary thread groove 103 is matched for screwing connection, the photovoltaic base is finally exposed at the top of the house, a waterproof coiled material of the photovoltaic base and an original waterproof coiled material of the roof are welded by a hot air welding gun, and then the photovoltaic base and the screw for connecting the photovoltaic guide rail are screwed into internal threads of the photovoltaic base and a photovoltaic guide rail reserved hole for final step fixing.

Example 6

Referring to fig. 6, the utility model discloses a fastening connector, which comprises an internal thread fastener 1, wherein the lower surface of the internal thread fastener 1 is fixedly connected with a round engagement platform piece 2, the middle part of the lower surface of the round engagement platform piece 2 is fixedly connected with a triangular dental drill tail piece 8, the structure of the triangular dental drill tail piece 8 comprises a sixth screw 801, the outer wall of the sixth screw 801 is fixedly connected with a sixth thread 802, and the lower surface of the sixth screw 801 is fixedly connected with a triangular dental drill tail 803.

In a preferred embodiment, the shape and size of the umbrella dental drill tail 703 are the same as the shape and size of the triangular dental drill tail 803, respectively, so as to improve the tightness of the connection photovoltaic bracket, and the phenomenon of wire slipping off is not easy to occur.

The working principle of the solar photovoltaic module is the same as that of the embodiment 1, the difference is that a sixth screw 801, a sixth thread 802 and a triangular dental drill tail 803 are directly drilled into a roof steel structure profiled steel plate of a house, the sixth thread 802 is rotatably drilled into the steel structure profiled steel plate of the roof by means of a hexagonal drill bit sleeved on the outer wall of a hexagonal head 101, only the parts which are connected with a round table piece 2 and an internal thread fastener 1 are leaked out, a constructor screws a screw for connecting the steel structure profiled steel plate with a screw of a photovoltaic base into a cylindrical bottom taper hole 102 in the hexagonal head 101, the sizes of matching rotary thread grooves 103 are screwed and connected, the photovoltaic base is finally exposed at the top of the house, a waterproof coiled material of the photovoltaic base and an original waterproof coiled material of the roof are welded by a hot air welding gun, and then the final step of fixing is carried out by means of screwing the screw for connecting the photovoltaic base with a photovoltaic guide rail into an internal thread of the photovoltaic base and a reserved hole of the photovoltaic guide rail.

The photovoltaic support structure is a square frame provided with a plurality of solar panels, a plurality of connecting holes are formed in the inner side of a keel of the frame, a threaded supporting rod bolt is taken out, the supporting rod bolt passes through the connecting holes of the photovoltaic support and then is screwed into a rotary threaded groove 103 on the upper surface of a fastening connecting piece, the fastening connecting piece can be used in installation among photovoltaics and also used in all building constructions requiring external hanging connection such as tunnel external hanging connection, wall decoration, air conditioner external machine installation, ceiling hanging connection and the like, and the photovoltaic support structure can be widely applicable and convenient to connect parts.

The above description is only of the preferred embodiments of the present utility model, and is not intended to limit the utility model, but any modifications, equivalent substitutions, improvements, etc. within the design concept of the present utility model should be included in the scope of the present utility model.

Claims

1. A fastening connection, characterized in that: the device comprises an internal thread fastener (1), wherein the lower surface of the internal thread fastener (1) is fixedly connected with a joint round table sheet (2); for the fastening connecting piece with the same structure internal thread fastener (1) and the connection round platform piece (2), the middle part of the lower surface of the connection round platform piece (2) is fixedly connected with a cusp tail cutting connecting piece (3), or is fixedly connected with a cusp tail cutting connecting piece (4), or is fixedly connected with a dental tail cutting connecting piece (5), or is fixedly connected with an umbrella dental spoon tail piece (6), or is fixedly connected with an umbrella dental tail cutting piece (7), or is fixedly connected with a triangular dental tail cutting piece (8).

2. A fastening connection as defined in claim 1, wherein: the structure of the internal thread fastener (1) comprises a hexagon head (101), wherein a cylindrical bottom taper hole (102) is formed in the middle of the upper surface of the hexagon head (101), and a rotary thread groove (103) is formed in the inner wall of the cylindrical bottom taper hole (102); the structure of the cusp tail cutting connecting piece (3) comprises a first screw rod (301), a cusp tail cutting end (303) is fixedly connected to the lower surface of the first screw rod (301), and a first thread strip (302) is fixedly connected to the outer wall of the first screw rod (301) and the outer wall of the cusp tail cutting end (303).

3. A fastening connection as defined in claim 2, wherein: the structure of the tooth horizontal tail connecting piece (4) comprises a second screw rod (401), and a second thread strip (402) is fixedly connected to the outer wall of the second screw rod (401); the structure of the dental drill tail connecting piece (5) comprises a third screw rod (501), wherein a third thread strip (502) is fixedly connected to the outer wall of the third screw rod (501), and a dental drill tail end (503) is fixedly connected to the lower surface of the third screw rod (501); the structure of the umbrella tooth soup spoon tail part (6) comprises a fourth screw rod (601), wherein a fourth thread strip (602) is fixedly connected to the outer wall of the fourth screw rod (601), and an umbrella tooth soup spoon tail part (603) is fixedly connected to the lower surface of the fourth screw rod (601); the structure of the umbrella dental drill tail part (7) comprises a fifth screw rod (701), wherein a fifth thread strip (702) is fixedly connected to the outer wall of the fifth screw rod (701), and the lower surface of the fifth screw rod (701) is fixedly connected with an umbrella dental drill tail part (703); the triangular dental drill tail part (8) comprises a sixth screw (801), wherein a sixth thread strip (802) is fixedly connected to the outer wall of the sixth screw (801), and a triangular dental drill tail part (803) is fixedly connected to the lower surface of the sixth screw (801).

4. A fastening connection as claimed in claim 3, wherein: the first thread (302), the second thread (402) and the third thread (502) are all the same in shape and size, the fourth thread (602) and the fifth thread (702) are all the same in shape and size, and the first thread (302) is different in shape and size from the fourth thread (602).

5. A fastening connection as claimed in claim 3, wherein: the inner space of the cylindrical bottom taper hole (102) is in a shape of combining a cylinder and a cone, the inner space of the rotary thread groove (103) is in a shape of a cylinder, the length dimension of the hexagonal head (101) is in a range of 14-15mm, the diameter dimension of the cylindrical bottom taper hole (102) is 8mm, and the depth dimension of the rotary thread groove (103) is in a range of 14-15mm.

6. A fastening connection as claimed in claim 3, wherein: the thickness dimension of the linking round table sheet (2) ranges from 1.6 mm to 2mm, and the diameter dimension of the linking round table sheet (2) ranges from 16 mm to 17mm.

7. A fastening connection as claimed in claim 3, wherein: the length dimension of the fifth screw (701) ranges from 23 mm to 25mm, the length dimension of the tail part (703) of the umbrella dental drill ranges from 5mm to 7mm, the diameter dimension of the tail part (7) of the umbrella dental drill ranges from 7mm to 7.1mm, the tooth-shaped cross section of the fifth screw (702) is umbrella-shaped, the degree range of tooth angle of the fifth screw is 35 degrees to 40 degrees, the tooth-shaped cross section of the fourth screw (602) is umbrella-shaped, and the degree range of tooth angle of the fourth screw is 35 degrees to 40 degrees.

8. A fastening connection as claimed in claim 3, wherein: the length dimension of the second screw rod (401) is equal to the sum of the length dimensions of the first screw rod (301) and the dental tip cutting tail end (303), the outer wall of the dental drill tail end (503) is not fixedly connected with the third thread strip (502), the length dimensions of the dental drill tail end (503), the umbrella dental spoon tail (603) and the umbrella dental drill tail (703) are equal to the length dimension of the dental tip cutting tail end (303), and the shape and the dimension of the umbrella dental drill tail (703) are respectively identical to those of the triangular dental drill tail (803).