CN213684890U

CN213684890U - Fastening screw capable of being fastened permanently

Info

Publication number: CN213684890U
Application number: CN202022615111.7U
Authority: CN
Inventors: 韩新博
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-11-11
Filing date: 2020-11-11
Publication date: 2021-07-13
Anticipated expiration: 2030-11-11

Abstract

The utility model discloses a never loose fastening screw, include: a large screw, a small screw and a workpiece; the large screw is provided with a through hole for the small screw to pass through, the workpiece is provided with a stage-shaped large internal threaded hole and a stage-shaped small internal threaded hole, and the external threads of the large screw and the small screw are opposite in rotating direction or the same in rotating direction and different in tooth pitch; the tail end of the large screw rod is assembled in the large internal thread hole, and the tail end of the small screw rod passes through the through hole and then is assembled in the small internal thread hole; the head end of the large screw rod is sleeved with a sleeve cap matched with the head end, and a plurality of ejector pins are annularly distributed on the sleeve cap; the sleeve cap is provided with a driving plate with a central hole, and a plurality of toggle columns at the bottom of the driving plate are correspondingly arranged in the toggle holes of the thimbles; a rotating piece is arranged below the head end of the small screw rod, and a plurality of top grooves are distributed on the rotating piece; the rotating piece is arranged in the middle of the ejector pin, the ejector pin is correspondingly clamped in the ejector groove, the small screw rod can rotate in the tightening direction and cannot rotate in the loosening direction, and the large screw rod, the small screw rod and the workpiece are locked.

Description

Fastening screw capable of being fastened permanently

Technical Field

The utility model relates to a screw technical field, concretely relates to fastening screw that never loosens.

Background

The screw includes a screw rod and a nut (nut), and a part for fastening by screwing the screw rod and the nut together is a common element for all production and manufacturing machines.

The existing common screw is a screw rod with unidirectional threads and a nut, and the screw rod and the nut are matched for use, so that the looseness of a joint can be easily caused under external environments such as vibration and the like.

Meanwhile, the existing screw also comprises common self-locking screws, the locknut is composed of two parts, each part is provided with a staggered cam, because the slope angle of the inner wedge type design is larger than the nut angle of the bolt, the combination is tightly meshed into a whole, when vibration occurs, the convex parts of the loose nut are mutually dislocated to generate lifting tension, and therefore the anti-loosening effect is achieved. However, the existing self-locking screw cannot cause the nut to be not loosened when the screw vibrates greatly or for a long time, and the existing self-locking screw needs to be checked frequently, so that labor, time and manpower, material resources and financial resources are consumed.

SUMMERY OF THE UTILITY MODEL

To the above-mentioned problem that exists among the prior art, the utility model provides a fastening screw that never loosens, this fastening screw can realize never loosening in its working life.

A first object of the present invention is to provide a fastening screw which is never loosened, include: a large screw, a small screw and a workpiece;

the large screw is provided with a through hole for the small screw to pass through, the workpiece is provided with a stage-shaped large internal threaded hole and a stage-shaped small internal threaded hole, and the external threads of the large screw and the small screw are opposite in rotation direction or the same in rotation direction and different in tooth pitch; the tail end of the large screw rod is assembled in the large internal thread hole, and the tail end of the small screw rod penetrates through the through hole and then is assembled in the small internal thread hole;

the head end of the large screw rod is sleeved with a sleeve cap matched with the head end, and a plurality of ejector pins are arranged on the sleeve cap in a surrounding mode; the sleeve cap is provided with a driving plate with a central hole, and a plurality of toggle columns at the bottom of the driving plate are correspondingly arranged in the toggle holes of the thimbles; a rotating piece is arranged below the head end of the small screw rod, and a plurality of top grooves are distributed on the rotating piece;

the rotating piece is arranged in the middle of the ejector pin, the ejector pin is correspondingly clamped in the ejector groove, the small screw rod can rotate in the tightening direction and cannot rotate in the loosening direction, and the large screw rod, the small screw rod and the workpiece are locked.

As a further improvement of the utility model, the large screw, the small screw, the workpiece, the sleeve cap, the driving plate and the rotating piece are coaxially arranged;

the lower surface of the rotating piece is pressed on the head end of the large screw rod, and the upper surface of the rotating piece is higher than the upper surface of the driving plate;

the rotating piece and the small screw rod are of an integrated structure, or a coaxial prism mounting table is arranged below the head end of the small screw rod, and a central hole of the rotating piece is assembled on the prism mounting table in a matching mode; the rotation of the small screw rod can drive the rotating piece to rotate.

As a further improvement of the present invention, the opening angle of the top groove is an acute angle, or a right angle, or an obtuse angle which can avoid the thimble from slipping;

when the opening angle of the top groove is an acute angle, the dismounting method of the fastening screw comprises the following steps: rotating the small screw rod for a preset angle along the tightening direction until the ejector pin is separated from the ejector slot; then, the driving plate is rotated, and the toggle column drives the thimble to be separated from the top groove of the rotating piece; finally, the small screw and the large screw are sequentially disassembled in a rotating mode along the loosening direction;

when the opening angle of the top groove is a right angle or an obtuse angle which can avoid the thimble from slipping, the method for disassembling the fastening screw comprises the following steps: rotating the driving plate, wherein the toggle column drives the thimble to be separated from the top groove of the rotating piece; and then, the small screw rod and the large screw rod are sequentially disassembled in a rotating mode along the loosening direction.

A second object of the present invention is to provide a fastening screw which is never loosened, include: a large screw, a small screw and a nut;

the large screw is provided with a small internal thread hole matched with the small screw, the nut is provided with a large internal thread hole matched with the large screw, the nut is provided with a gasket with a small central hole, and the external threads of the large screw and the small screw are opposite in rotating direction or same in rotating direction and different in tooth pitch; the tail end of the large screw rod is assembled in the large internal thread hole, and the tail end of the small screw rod penetrates through the gasket and is oppositely assembled in the small internal thread hole;

the nut is sleeved with a sleeve cap matched with the nut, and a plurality of ejector pins are annularly distributed on the sleeve cap; the sleeve cap is provided with a driving plate with a central hole, and a plurality of toggle columns at the bottom of the driving plate are correspondingly arranged in the toggle holes of the thimbles; a rotating piece is arranged below the head end of the small screw rod, and a plurality of top grooves are distributed on the rotating piece;

the rotating piece is arranged in the middle of the ejector pin, the ejector pin is correspondingly clamped in the ejector groove, the small screw rod can rotate in the tightening direction and cannot rotate in the loosening direction, and the large screw rod, the small screw rod and the nut are locked.

As a further improvement of the utility model, the large screw, the small screw, the nut, the sleeve cap, the driving plate and the rotating piece are coaxially arranged;

the lower surface of the rotating piece is pressed on the gasket, and the upper surface of the rotating piece is higher than the upper surface of the driving plate;

A third object of the present invention is to provide a fastening screw which is never loosened, include: a large screw, a small screw and a workpiece;

the head end of the large screw is provided with a groove for accommodating the head end of the small screw, and the axial direction of the groove is provided with a clamping groove for accommodating the elastic sheet; when the elastic sheet is clamped into the clamping groove, the large screw, the small screw and the workpiece are locked; or the head end of the large screw is provided with a groove for accommodating the head end of the small screw, the axial direction of the groove is provided with a clamping groove for accommodating an elastic sheet, and the elastic sheet is provided with a clamping head for clamping the head end of the small screw; when the elastic sheet is clamped into the clamping groove, the clamping head of the elastic sheet is clamped into the head end hole of the small screw rod, and the large screw rod, the small screw rod and the workpiece are locked.

As a further improvement of the utility model, the small screw head end is hexagon socket or cross hole, the dop of shell fragment is the polygon dop or the inline dop of looks adaptation.

A fourth object of the present invention is to provide a fastening screw that is never loosened, include: a large screw, a small screw and a nut;

the large screw rod is provided with a small inner threaded hole matched with the small screw rod, the middle part of the nut is provided with a gasket with a small central hole, a large inner threaded hole matched with the large screw rod is formed in the nut on one side of the gasket, and the external threads of the large screw rod and the small screw rod are opposite in rotating direction or same in rotating direction and different in tooth pitch; the tail end of the large screw rod is assembled in the large internal thread hole, and the tail end of the small screw rod penetrates through the gasket and is oppositely assembled in the small internal thread hole;

a groove for accommodating the head end of the small screw rod is formed in the nut on the other side of the gasket, and a clamping groove for accommodating an elastic sheet is axially formed in the groove; when the elastic sheet is clamped into the clamping groove, the large screw, the small screw and the workpiece are locked; or a groove for accommodating the head end of the small screw rod is arranged in the nut on the other side of the gasket, a clamping groove for accommodating an elastic sheet is axially arranged in the groove, and a clamping head for clamping the head end of the small screw rod is arranged on the elastic sheet; when the elastic sheet is clamped into the clamping groove, the clamping head of the elastic sheet is clamped into the head end hole of the small screw rod, and the large screw rod, the small screw rod and the workpiece are locked.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model realizes self-locking during assembly by the external threads with opposite rotation directions of the big screw rod and the small screw rod;

the utility model adopts the locking mechanism consisting of the sleeve cap, the driving plate and the rotating part, the locking mechanism compresses the small screw rod, and the small screw rod compresses the large screw rod; the thimble of the sleeve cap is correspondingly clamped in the top groove of the rotating part, so that the small screw rod can only rotate along the tightening direction and can not rotate along the loosening direction, the large screw rod, the small screw rod and the workpiece are locked, and the looseness is never realized;

the utility model realizes the locking of the driving plate by selecting the top groove with an acute opening angle; namely, only rotating the small screw rod along the tightening direction by a preset angle until the ejector pin is separated from the ejector groove; then, the driving plate is rotated, the poking column can drive the thimble to be separated from the top groove of the rotating piece, so that disassembly is realized, and the lock is more suitable for occasions with higher requirements on the lock;

the utility model discloses a shell fragment compresses tightly little screw rod, little screw rod and compresses tightly big screw rod, accomplishes rightly the locking of big screw rod, little screw rod and work piece realizes never becoming flexible.

Drawings

Fig. 1 is a schematic structural view of a fastening screw disclosed in embodiment 1 of the present invention;

fig. 2 is a schematic structural view of embodiment 1 of the present invention without a workpiece, a cap and a driving plate;

FIG. 3 is a schematic structural view of a large screw rod in embodiment 1 of the present invention;

FIG. 4 is a schematic view of the assembly of the small screw and the rotary member in embodiment 1 of the present invention;

fig. 5 is a schematic structural view of a workpiece in embodiment 1 of the present invention;

fig. 6 is a schematic structural view of a cap set in embodiment 1 of the present invention; wherein, a is a front view, and b is a back view;

fig. 7 is a schematic structural diagram of a driving plate in embodiment 1 of the present invention; wherein, a is a front view, and b is a back view;

fig. 8 is a schematic structural view of a rotating member in embodiment 1 of the present invention;

fig. 9 is an assembly schematic diagram of a large screw, a workpiece and a sleeve cap in embodiment 1 of the invention;

fig. 10 is an assembly schematic view of a large screw, a workpiece, a sleeve cap, a driving plate and a rotating member in embodiment 1 of the present invention;

fig. 11 is an assembled rear view of the cap, the drive plate and the rotary member according to embodiment 1 of the present invention;

fig. 12 is a schematic structural view of a rotating member according to embodiment 2 of the present invention;

fig. 13 is an assembly schematic view of a large screw, a workpiece, a sleeve cap and a rotating member in embodiment 2 of the present invention;

fig. 14 is a schematic structural view of a fastening screw according to embodiment 3 of the present invention;

fig. 15 is an assembly schematic view of a large screw, a nut and a gasket in embodiment 3 of the present invention;

fig. 16 is a schematic structural view of embodiment 3 of the present invention without a cap and a driving plate;

fig. 17 is a schematic structural view of a fastening screw disclosed in embodiment 5 of the present invention;

fig. 18 is a schematic structural view of a fastening screw cut along a slot in embodiment 5 of the present invention;

fig. 19 is a schematic structural view of the elastic sheet according to embodiment 5 of the present invention; wherein, a is a front view, and b is a back view;

fig. 20 is a schematic structural view of a fastening screw disclosed in embodiment 6 of the present invention;

fig. 21 is a schematic structural view of a spring plate in embodiment 6 of the present invention; wherein, a is a front view, and b is a back view;

fig. 22 is a schematic structural view of a fastening screw disclosed in embodiment 7 of the present invention;

fig. 23 is a schematic structural view of a fastening screw disclosed in embodiment 8 of the present invention.

In the figure:

10. a large screw; 11. a through hole;

20. a small screw;

30. a workpiece; 31. a large internal threaded hole; 32. a small internal threaded bore; 33. a card slot;

40. a nut; 41. a gasket;

50. sleeving a cap; 51. a thimble; 52. a toggle hole;

60. a drive plate; 61. shifting the column;

70. a rotating member; 71. a top groove;

80. a spring plate; 81. and (4) clamping the head.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

The invention is described in further detail below with reference to the accompanying drawings:

example 1

As shown in fig. 1-11, the utility model provides a fastening screw that never loosens, include: a large screw 10, a small screw 20, a workpiece 30, a cap 50, a driving plate 60 and a rotating member 70 which are coaxially arranged; wherein, the large screw 10 and the small screw 20 of the embodiment 1 are installed in the same direction, and the rotating member 70 adopts a top groove 71 with an acute opening angle;

the method specifically comprises the following steps:

as shown in fig. 3, the large screw 10 of the present invention is provided with a through hole 11 for the small screw 20 to pass through, the through hole 11 can be a threaded hole or a common smooth through hole, the external threads of the large screw 10 and the small screw 20 have opposite or same direction and different pitches; the workpiece 30 of the present invention is provided with a step-shaped large internal threaded hole 31 and a step-shaped small internal threaded hole 32, wherein the threads of the large internal threaded hole 31 and the small internal threaded hole 32 have opposite turning directions or the same turning direction and different pitches, as shown in fig. 5; based on this, when the screw is installed, the tail end of the large screw 10 is assembled in the large internal threaded hole 31, and the tail end of the small screw 20 is assembled in the small internal threaded hole 32 after passing through the through hole 11 of the large screw 10, so that the connection of the large screw 10, the small screw 20, a workpiece or a double-hole screw cap 30 is realized, and the screw is used for fixing parts to be assembled. Further, the workpiece 30 of the present invention may have a nut structure, or may have a large internal threaded hole 31 and a small internal threaded hole 32 corresponding to each other by drilling on the existing workpiece (flange, etc.).

The head end of the big screw rod 10 of the utility model is sleeved with a sleeve cap 50 matched with the head end, a plurality of thimbles 51 which can be shifted are annularly distributed on the sleeve cap 50, and each thimble 51 is provided with a shifting hole 52; specifically, as shown in a and b in fig. 6, a hexagon socket is provided at the bottom of the sleeve cap 50, and the hexagon socket is fittingly sleeved on the hexagon head end of the big screw 10 to realize the assembly of the sleeve cap 50 and the big screw 10; the top of the inner circular side wall of the cap 50 is annularly provided with 6 thimbles 51 which can be shifted, the 6 thimbles 51 are attached to the head end of the big screw 10, and the middle parts of the 6 thimbles 51 are provided with a middle space for assembling the rotating element 70, as shown in fig. 9; the driving plate 60 with a central hole is arranged at the top of the cap 50, the central hole can be passed by the rotating piece 70, and the aperture of the central hole is smaller than the head end of the small screw rod 20; as shown in a and b in fig. 7, 6 toggle posts 61 at the bottom of the driving plate 60 of the present invention are correspondingly disposed in the toggle holes 52 of each thimble 51, so as to realize the assembly of the driving plate 60 and the cap 50, as shown in fig. 10. As shown in fig. 2, 4 and 8, a rotating member 70 is installed below the head end of the small screw rod 20 of the present invention, a plurality of top grooves 71 are annularly distributed on the rotating member 70, and the opening angle of the top grooves 71 is an acute angle; wherein, the lower surface of the rotating member 70 of the present invention is pressed on the head end of the large screw 10, and the upper surface is higher than the upper surface of the driving plate 60, so that a gap is left between the lower surface of the head end of the small screw 20 and the upper surface of the driving plate 60, and the rotation of the driving plate 60 is not affected by the compression of the small screw 20; meanwhile, the utility model can be provided with an elastic pad or a flexible pad in the gap, so as to prevent external dust from entering the structure of the rotating part 70 and further prevent vibration; further, the rotating part 70 and the small screw rod 20 are of an integral structure, or the small screw rod 20 is provided with a coaxial prism mounting table below the head end, and the hexagonal hole of the rotating part 70 is matched and assembled on the prism mounting table, so that the rotating part 70 can be driven to rotate by the rotation of the small screw rod 20.

As shown in fig. 11, the rotating member 70 of the present invention is disposed in the middle of the thimble 51, and the thimble 51 is correspondingly clamped in the top groove 71, so that the small screw 20 can rotate along the tightening direction and cannot rotate along the loosening direction, thereby locking the large screw, the small screw and the workpiece; that is, in the drawing shown in fig. 11, the small screw 20 can only drive the rotating member 70 to tighten clockwise, but cannot loosen counterclockwise; based on the structure, the utility model discloses a fastening screw is after the installation, and it is tight more to only receive more, and then realizes never becoming flexible.

The utility model discloses fastening screw's mounting method does:

step 1, aiming at a part to be fixed, a large screw 10 penetrates through a through hole of the part from one side to the other side of the part, and the tail end of the large screw 10 is installed in a large internal threaded hole 31 of a workpiece 30; wherein, the head end of the big screw 10 and the workpiece 30 are respectively arranged at two sides of the part to be fixed;

step 2, sleeving the sleeve cap 50 on the head end of the large screw 10, or connecting the sleeve cap 50 and the head end of the large screw 10 into a whole, or realizing the rotation stop of the sleeve cap 50 and the head end of the large screw 10 in a matching mode of a groove and a bulge, covering the drive plate 60 on the sleeve cap 50, and inserting the toggle column 61 of the drive plate 60 into the toggle hole 52 of the thimble 51 to realize the assembly of the sleeve cap 50, the drive plate 60 and the large screw 10;

step 3, connecting the rotating piece 70 to the small screw rod 20, then sequentially inserting the rotating piece 70 into the central hole of the driving plate 60 from one side to the other side, placing the rotating piece 70 on the head end of the large screw rod 10 and in the middle area surrounded by the thimble 51, and then inserting the small screw rod 20 into the central through hole 11 of the large screw rod 10;

step 4, rotating the small screw rod 20 along the tightening direction to enable the small screw rod 20 to be screwed in the small internal thread 32 of the workpiece 30; at this time, the thimble 51 does not affect the rotation of the rotary member 70 when the rotation is tightened;

step 5, after the small screw rod 20 is rotated, tightened and installed in place, the thimble 51 is clamped at the clamping groove 71 of the rotating piece 70, so that the rotating piece 70 cannot be loosened; and further the fastening screw can not be loosened permanently after installation.

The utility model discloses fastening screw's dismantlement method does:

since the opening angle of the top groove 71 is acute, the thimble 51 does not have a space to be opened by pulling, and therefore the drive plate 60 cannot be directly rotated to separate the thimble 51 from the top groove 71. Therefore, when the utility model is disassembled, the small screw rod 20 needs to be rotated by a preset angle along the tightening direction until the thimble 51 has the condition of being separated from the top groove 71, for example, in the structure shown in fig. 2, the hexagonal head end of the small screw rod 20 is rotated to a position parallel to each side of the hexagonal head end of the driving plate 60; then, the driving plate 60 is rotated, and the toggle post 61 drives the thimble 51 to be separated from the top groove 71 of the rotating piece 70; finally, the small screw 20 and the large screw 10 are disassembled in turn in a rotating way along the loosening direction; and (5) completing the disassembly.

Example 2

As shown in fig. 12 and 13, the present invention provides a fastening screw which is never loosened, and the difference from embodiment 1 is that the opening angle of the top groove 71 is a right angle or an obtuse angle which can prevent the thimble from slipping.

The utility model provides a method for installing a fastening screw, which is consistent with the embodiment 1;

the utility model provides a method for disassembling fastening screws, because the opening angle of the top groove 71 is a right angle or an obtuse angle which can avoid the slip of the thimble, the thimble 51 has a shifting opening space, so the driving plate 60 can be directly rotated to make the thimble 51 break away from the top groove 71; the subsequent disassembly method was identical to example 1.

Example 3

As shown in fig. 14-16, the utility model provides a fastening screw that never loosens, include: a large screw 10, a small screw 20, a nut 40, a cap 50, a drive plate 60 and a rotary member 70 which are coaxially arranged; wherein, the large screw 10 and the small screw 20 of the embodiment 3 are oppositely arranged, and the rotating member 70 adopts a top groove 71 with an acute opening angle;

the difference from embodiment 1 is that in this embodiment, a small internal threaded hole 32 matched with the small screw 20 is provided on the large screw 10, and the small internal threaded hole 32 can be a through hole or a blind hole; the nut 40 has a large internal threaded hole 31 for matching with the large screw 10, a washer 41 with a small central hole is arranged on the nut 40, the washer 41 and the nut 40 can be of a separated structure or an integrated structure, the washer 41 provides a mounting platform for the rotating element 70, and the small screw 20 can pass through the small central hole of the washer 41. In this embodiment, the nut 40 is sequentially sleeved with the cap 50, the driving plate 60, and the rotary member 70, which are the same as those in embodiment 1, and thus, will not be described in detail.

The utility model discloses fastening screw's mounting method does:

step 1, aiming at a part to be fixed, after a large screw 10 passes through a through hole of the part from the lower side to the upper side of the part, the tail end of the large screw 10 is installed in a large internal threaded hole 31 of a nut 40; wherein, the head end of the big screw 10 and the nut 40 are respectively arranged at two sides of the part to be fixed;

step 2, arranging a gasket 41 on the upper side surface of the nut 40, then sleeving the sleeve cap 50 on the nut 40, covering the driving plate 60 on the sleeve cap 50, and inserting the toggle column 61 of the driving plate 60 into the toggle hole 52 of the thimble 51 to realize the assembly of the sleeve cap 50, the driving plate 60 and the nut 40;

step 3, connecting the rotating piece 70 to the small screw rod 20, then sequentially inserting the rotating piece 70 into the central hole of the driving plate 60 from the upper side to the lower side, placing the rotating piece 70 on the gasket 41 of the nut 40 and in the middle area surrounded by the thimble 51, and then inserting the small screw rod 20 into the small internal thread hole 32 of the large screw rod 10;

step 4, rotating the small screw rod 20 along the tightening direction to enable the small screw rod 20 to be screwed in the small internal thread 32 of the large screw rod 10; at this time, the thimble 51 does not affect the rotation of the rotary member 70 when the rotation is tightened;

The utility model discloses fastening screw's dismantlement method does:

since the opening angle of the top groove 71 is acute, the thimble 51 does not have a space to be opened by pulling, and therefore the drive plate 60 cannot be directly rotated to separate the thimble 51 from the top groove 71. Therefore, when the utility model is disassembled, the small screw rod 20 needs to be rotated by a preset angle along the tightening direction until the thimble 51 is separated from the top groove 71, for example, in the structure shown in fig. 14, the hexagonal head end of the small screw rod 20 is rotated to a position parallel to each side of the hexagonal head end of the driving plate 60; then, the driving plate 60 is rotated, and the toggle post 61 drives the thimble 51 to be separated from the top groove 71 of the rotating piece 70; finally, the small screw 20 and the large screw 10 are disassembled in turn in a rotating way along the loosening direction; and (5) completing the disassembly.

Example 4

The utility model provides a fastening screw that never loosens, its difference with embodiment 3 lies in that the opening angle of top groove 71 is the right angle or can avoid the obtuse angle that the thimble skidded.

The utility model provides a fastening screw's mounting method, it is unanimous with embodiment 3.

The utility model provides a method for disassembling fastening screws, because the opening angle of the top groove 71 is a right angle or an obtuse angle which can avoid the slip of the thimble, the thimble 51 has a shifting opening space, so the driving plate 60 can be directly rotated to make the thimble 51 break away from the top groove 71; the subsequent disassembly method was consistent with example 3.

Example 5

As shown in fig. 17-19, the utility model provides a fastening screw that never loosens, include: the large screw 10, the small screw 20, the workpiece 30 and the elastic sheet 80 are coaxially arranged; the large screw 10 and the small screw 20 of the embodiment 5 are installed in the same direction, the head end of the small screw 20 is a hexagon socket, and the clamping head 81 of the elastic sheet 80 is a matched polygonal clamping head;

the method specifically comprises the following steps:

as shown in fig. 3, the large screw 10 of the present invention is provided with a through hole 11 for the small screw 20 to pass through, the through hole 11 can be a threaded hole or a common smooth through hole, the external threads of the large screw 10 and the small screw 20 have opposite or same direction and different pitches; the workpiece 30 of the present invention is provided with a step-shaped large internal threaded hole 31 and a step-shaped small internal threaded hole 32, wherein the threads of the large internal threaded hole 31 and the small internal threaded hole 32 have opposite turning directions or the same turning direction and different pitches, as shown in fig. 5; based on this, when the screw is installed, the tail end of the large screw 10 is assembled in the large internal threaded hole 31, and the tail end of the small screw 20 is assembled in the small internal threaded hole 32 after passing through the through hole 11 of the large screw 10, so that the connection of the large screw 10, the small screw 20 and the workpiece 30 is realized, and the screw is used for fixing a part to be assembled. Further, the workpiece 30 of the present invention may have a nut structure, or may have a large internal threaded hole 31 and a small internal threaded hole 32 corresponding to each other by drilling on the existing workpiece (flange, etc.).

The head end of the big screw rod 10 of the utility model is provided with a groove for accommodating the head end of the small screw rod 20, the axial direction of the groove is provided with a clamping groove 33 for accommodating the elastic sheet 80, and the elastic sheet 80 is provided with a clamping head 81 for clamping the head end of the small screw rod; when the elastic sheet 80 is clamped into the clamping groove 33, the clamping head 81 of the elastic sheet 80 is clamped into the inner hexagonal head end hole of the small screw rod, and the large screw rod 10, the small screw rod 20 and the workpiece 30 are locked.

The utility model discloses fastening screw's mounting method does:

step 1, aiming at a part to be fixed, a large screw 10 passes through a through hole of the part from the lower side to the upper side of the part, and then the tail end of the large screw 10 is installed in a large internal threaded hole 31 of a workpiece 30; wherein, the head end of the big screw 10 and the workpiece 30 are respectively arranged at two sides of the part to be fixed;

step 2, threading the small screw 20 into the small internal thread hole 32 of the workpiece 30 after the small screw passes through the groove at the head end of the large screw 10 and the through hole 11 in sequence;

and 3, after the small screw rod 20 is assembled, clamping the elastic sheet 80 in the clamping groove 33 at the head end of the large screw rod 10, and clamping the clamping head 81 of the elastic sheet 80 into the inner hexagonal head end hole of the small screw rod, so that the head end of the small screw rod 20 is compressed, and the fastening screw is ensured not to be loosened after installation.

Further, the utility model discloses can omit 19 dop 81, only through shell fragment 80 and complex draw-in groove 33, realize compressing tightly little screw rod 20.

The utility model discloses fastening screw's dismantlement method does:

the elastic sheet 80 is taken out, the pressing of the elastic sheet 80 on the head end of the small screw rod 20 is released, and the small screw rod 20 and the large screw rod 10 are sequentially disassembled in a rotating mode along the loosening direction; and (5) completing the disassembly.

Example 6

As shown in fig. 20 to 21, the present invention provides a fastening screw which is never loosened, and the difference from embodiment 5 lies in that the head end of the small screw rod 20 is an inner cross hole, and the clip 81 of the elastic piece 80 is a linear clip adapted to the head end.

The utility model provides a fastening screw's mounting method, it is unanimous with embodiment 5.

The utility model provides a fastening screw's dismantlement method, it is unanimous with embodiment 5.

Example 7

As shown in fig. 22, the utility model provides a fastening screw that never loosens, include: the large screw 10, the small screw 20, the nut 40 and the elastic sheet 80 are coaxially arranged; the large screw 10 and the small screw 20 of the embodiment 5 are oppositely arranged, the head end of the small screw 20 is a hexagon socket, and the clamping head 81 of the elastic sheet 80 is a matched polygonal clamping head;

the difference from embodiment 5 is that in this embodiment, a small internal threaded hole 32 matched with the small screw 20 is provided on the large screw 10, and the small internal threaded hole 32 can be a through hole or a blind hole; the nut 40 has a large internally threaded hole 31 which is engaged with the large screw 10; the nut 40 is provided with a groove for accommodating the head end of the small screw rod 20, the axial direction of the groove is provided with a clamping groove 33 for accommodating the elastic sheet 80, and the elastic sheet 80 is provided with a clamping head 81 for clamping the head end of the small screw rod; when the elastic sheet 80 is clamped into the clamping groove 33, the clamping head 81 of the elastic sheet 80 is clamped into the inner hexagonal head end hole of the small screw rod, and the large screw rod 10, the small screw rod 20 and the nut 40 are locked.

The utility model discloses fastening screw's mounting method does:

step 2, threading the small screw 20 into the small internal thread hole 32 of the large screw 10 after sequentially passing through the groove at the head end of the nut 40 and the small internal thread hole 32 of the large screw 10;

and 3, after the small screw rod 20 is assembled, clamping the elastic sheet 80 in the clamping groove 33 of the nut, clamping the clamping head 81 of the elastic sheet 80 into the inner hexagonal head end hole of the small screw rod, realizing the compression of the head end of the small screw rod 20 and ensuring that the fastening screw is never loosened after the small screw rod is installed.

Further, the utility model discloses can omit 21 dop 81, only through shell fragment 80 and complex draw-in groove 33, realize compressing tightly little screw rod 20.

The utility model discloses fastening screw's dismantlement method does:

Example 8

As shown in fig. 23, the present invention provides a fastening screw that is never loosened, which is different from embodiment 7 in that the head end of the small screw rod 20 is an inner cross hole, and the clip 81 of the elastic piece 80 is a linear clip that is matched with the inner cross hole.

The utility model provides a fastening screw's mounting method, it is unanimous with embodiment 7.

The utility model provides a fastening screw's dismantlement method, it is unanimous with embodiment 7.

The utility model has the advantages that:

the utility model adopts the locking mechanism consisting of the sleeve cap, the driving plate and the rotating part, the locking mechanism compresses the small screw rod, and the small screw rod compresses the large screw rod; the thimble of the sleeve cap is correspondingly clamped in the top groove of the rotating piece, so that the small screw rod can only rotate along the tightening direction and can not rotate along the loosening direction, the locking of the large screw rod, the small screw rod and the workpiece is completed, and the looseness is never realized;

the utility model realizes the locking of the driving plate by selecting the top groove with an acute opening angle; namely, only rotating the small screw rod for a preset angle along the tightening direction until the thimble is separated from the top groove; then, the driving plate is rotated, the thimble can be driven to be separated from the top groove of the rotating piece only by shifting the column, so that the disassembly is realized, and the lock is more suitable for occasions with higher requirements on the lock;

the utility model discloses a shell fragment compresses tightly little screw rod, little screw rod and compresses tightly big screw rod, accomplishes the locking to big screw rod, little screw rod and work piece, realizes never becoming flexible.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A permanently non-loosening fastening screw, comprising: a large screw, a small screw and a workpiece;

2. The fastening screw according to claim 1, wherein the large screw rod, the small screw rod, the workpiece, the cap, the driving plate and the rotary member are coaxially disposed;

3. A permanently non-loosening fastening screw, comprising: a large screw, a small screw and a nut;

4. The fastening screw of claim 3, wherein the large screw, the small screw, the nut, the cap, the driving plate and the rotary member are coaxially disposed;

5. A permanently non-loosening fastening screw, comprising: a large screw, a small screw and a workpiece;

6. The fastening screw according to claim 5, wherein the head end of the small screw rod is a hexagon socket or a cross socket, and the clip of the spring plate is a matched polygonal clip or a straight clip.

7. A permanently non-loosening fastening screw, comprising: a large screw, a small screw and a nut;

8. The fastening screw according to claim 7, wherein the head end of the small screw rod is a hexagon socket or a cross socket, and the clip of the spring plate is a matched polygonal clip or a straight clip.