CN211473183U

CN211473183U - Screw-in back bolt with stress-free function

Info

Publication number: CN211473183U
Application number: CN201921779650.5U
Authority: CN
Inventors: 李诗全; 陈小珍; 陈辉
Original assignee: Fuzhou Baiyibaili Automation Technology Co ltd
Current assignee: Fuzhou Baiyibaili Automation Technology Co ltd
Priority date: 2019-10-22
Filing date: 2019-10-22
Publication date: 2020-09-11
Anticipated expiration: 2029-10-22

Abstract

The utility model relates to a screw-in back bolt with stress-free function, which comprises a screw rod, an outer cylinder and a movable block; the screw is provided with an external thread, and the inner wall of the outer barrel is provided with an internal thread matched with the external thread of the screw; one or more sliding chutes are formed in the side wall of the outer barrel, and each sliding chute comprises an anastomosis point and an anastomosis position; the movable block is one or more, the one end of movable block is equipped with the axial region, and the other end is equipped with lug portion, the axial region setting of movable block is in the point of kissing, lug portion activity sets up in the position of coincideing, the screw rod is used for precessing behind the urceolus, carries on spacingly to the lug portion of movable block, causes the part of lug portion or whole protrusion urceolus surface. Realize that back of the body bolt and decorative board have very reliable connection, the slip of movable block can not produce stress to the decorative board moreover, can not lead to the fact destruction to the decorative board, can not produce and outer resistance to the rotation of screw rod simultaneously for the screw rod is the urceolus of convenient and fast precession more.

Description

Screw-in back bolt with stress-free function

Technical Field

The utility model relates to a fastener technical field, in particular to precession formula back of body is tied with unstressed function.

Background

With the development of the architectural engineering technology and the economic level, the decoration on the surface of the building wall adopts cement lime mortar and paint to imitate porcelain from the traditional way, and the decorative panels such as wall cloth, diatom mud, porcelain plates, marble, granite plates and the like which have the functions of beauty, environmental protection, easy cleaning, sound insulation, heat insulation and heat preservation are adopted at present. Especially, marble and granite plates are adopted to act on the veneer to decorate the wall surface in high-and medium-grade home and hotels, conference rooms, offices and commercial buildings. The decorative panel for decorating the wall surface needs to be fixed on the wall surface through the hanging piece, the hanging piece and the decorative panel are connected through the back bolt, the hanging frame is connected through the matching of the back bolt and the slotted hole, the existing decorative panel is thinner and thinner, particularly, the stone heat-insulating integrated panel is provided with a stone panel with the thickness of 10MM, the existing knocking back bolt and the existing screwing back bolt cannot meet the requirements, the 10MM thick stone panel is provided with 7 deep holes for installing the knocking back bolt and the screwing back bolt, but when the knocking back bolt or the screwing back bolt is positioned for use, the impact force can be generated, the impact force can be converted to generate destructive force on the decorative panel, the decorative panel is easy to damage, the breakage rate of the stone panel is directly improved, and the defect is very few, the knocking back bolt, the hanging piece and the screwing back bolt, The screw-in back bolt is not developed into a standard product which is correspondingly used on a stone village panel with the thickness of 10MM at present, so the inventor develops a screw-in back bolt with a stress-free function by combining market requirements and stone thin plate characteristics, and mainly solves the problem of anchoring the back bolt of the stone panel with the thickness of 10MM or less.

SUMMERY OF THE UTILITY MODEL

Therefore, a screw-in back bolt with a stress-free function is needed to be provided, and the problem that the veneer is easily damaged due to stress generated on the veneer when the existing back bolt is installed is solved.

In order to achieve the purpose, the inventor provides a screw-in back bolt with a stress-free function, which comprises a screw rod, an outer cylinder and a movable block;

the screw is provided with an external thread, and the inner wall of the outer barrel is provided with an internal thread matched with the external thread of the screw;

one or more sliding chutes are formed in the side wall of the outer barrel, and each sliding chute comprises an anastomosis point and an anastomosis position;

one or more movable blocks are provided, one end of each movable block is provided with a shaft part, the other end of each movable block is provided with a lug part, the shaft parts of the movable blocks are arranged in the matching points, and the lug parts are movably arranged in the matching positions;

the screw is used for limiting the lug part of the movable block after being screwed into the outer barrel, so that part or all of the lug part protrudes out of the surface of the outer barrel.

Further preferably, the sliding grooves in the side wall of the outer barrel are arranged in one layer or multiple layers, and each layer is provided with one or more sliding grooves.

Further preferably, the screw rod is provided with a screw opening, and the screw opening is a hexagonal screw head, an inner hexagonal groove, a straight screw opening, a cross screw opening or a special screw opening.

Preferably, the shape of the outer cylinder is circular, polygonal or elliptical.

Further preferably, when the outer barrel is circular, the surface of the outer barrel is provided with an external thread or a positioning opening, or the top end of the outer barrel is provided with a positioning countersunk head.

Preferably, the anastomosis point is spherical, and the shaft of the movable block is spherical.

Further optimization, the outer wall of the outer cylinder is provided with an adhesive tape, a rope or a component with elasticity for limiting the movable block; or the inner side of the movable block is provided with a magnet which enables the movable block to attract each other.

Further optimizing, the outer barrel is provided with a limiting block or a limiting indicating point is arranged on the screw rod.

Further preferably, the upper surface of the projection part of the movable block is an inclined surface.

Further optimization, a fixing nut is arranged on the screw rod; or the outer cylinder is circular, and a fixing nut in threaded connection with the outer cylinder is arranged on the outer cylinder.

Further preferably, the outer cylinder or/and the movable block are/is provided with a shockproof layer on the surface.

Different from the prior art, according to the technical scheme, when the pendant and the veneer are required to be connected through the screw-in back bolt, firstly, a groove or a hole matched with the back bolt outer cylinder is formed in the veneer, and preferably, an expanded groove is formed at the bottom of the groove or the hole of the veneer; the urceolus that will screw in formula back of the body bolt is put into the groove or the downthehole of decorative board, and because the movable block can inwards shift the shrink in the spout of urceolus, make the urceolus can place at the groove or the downthehole of decorative board smoothly, through with the screw rod precession urceolus, along with the screw rod precession urceolus, promote the movable block, make the lug portion of movable block outwards slide along coinciding the position, and after the screw rod has revolved, the lug portion embedding decorative board of movable block or the expanding inslot in hole, then fasten through the nut again, realize that back of the body bolt has very reliable connection with the decorative board, and because the cooperation of the spout of movable block and drum, the slip of movable block can not produce stress to the decorative board, can not cause destruction to the decorative board, can not produce outer resistance to the rotation of screw rod simultaneously, make the screw rod more convenient and fast screw in the urceol.

Has the following beneficial effects:

1. the utility model provides a precession formula back of body bolt with unstressed function has solved the back of body bolt anchor of stone material, ceramic tile class decorative board sheet metal through its unstressed characteristic, can be used to than 10MM thick thinner decorative board, for example: the thickness of the veneer is 9MM and 8MM, so that the veneer can be thinner and lighter on the basis of ensuring that each node has reliable connection.

2. The screw-in back bolt with the stress-free function greatly reduces the loss rate of a veneer by the stress-free characteristic and subtracting the destructive force caused by the impact force of the traditional back bolt on the veneer.

3. The utility model provides a precession formula back of body bolt with unstressed function, it can also be used as the crab-bolt, not only is applied to decorative board such as stone material, ceramic tile, can also be applied to the wall body, when being applied to the wall body, and the anchor eye that it seted up need not have seted up the expanding groove, uses like.

4. A screw-in back bolt with stress-free function is characterized by its stress-free property

The screw-in back bolt accords with the technical specification of the national common people's republic of China industry standard JGJ 321-2014 decorative engineering technical specification of the point-hanging external wall panel, has the advantages that the technical specification of the point-hanging external wall panel is met, the 5.5.4 clause (clause: when the pendant is adopted for connection, the pendant is suitable for having three-dimensional adjusting capacity and realizing independent installation and disassembly of the panel, a T-shaped pendant and a picking piece cannot be used, when the pendant is made of stainless steel, the thickness of the pendant is not less than 3MM, and when aluminum alloy is adopted, the thickness of the pendant is not less than 4MM.) the panel is suitable for realizing independent installation and disassembly, and the screw-in back bolt with the stress-free function has the application performance of independent installation and disassembly and just meets the technical specification of the.

Drawings

FIG. 1 is a schematic diagram of a screw-in back bolt with stress-free function according to an embodiment;

FIG. 2 is another schematic structural diagram of the movable block according to the embodiment

FIG. 3 is a schematic view of another embodiment of a screw-in back bolt with stress-free function;

FIG. 4 is another structural schematic diagram of the screw-in back bolt with the stress-free function according to the embodiment,

fig. 5 is another structural diagram of the screw-in back bolt with the stress-free function according to the embodiment.

Description of reference numerals:

110. the screw rod is provided with a screw rod,

120. an outer cylinder is arranged on the outer cylinder,

130. a movable block is arranged on the base plate,

140. a sliding groove is arranged on the top of the sliding groove,

150. a positioning nut is arranged on the base plate,

160. a positioning countersunk head is arranged at the bottom of the groove,

170. the nut is fixed on the base plate,

210. a shaft portion which is provided on the outer circumferential surface of the shaft portion,

220. a bump portion.

Detailed Description

To explain technical contents, structural features, and objects and effects of the technical solutions in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.

Referring to fig. 1-2, the embodiment provides a screw-in back bolt with a stress-free function, which is not only suitable for connecting thin veneers, such as stone veneers, glass veneers, ceramic veneers, and the like, with a pendant, but also suitable for mounting various devices on various walls, and also suitable for assembling toys, including a screw 110, an outer cylinder 120, and a movable block 130;

the screw 110 is provided with an external thread, and the inner wall of the outer cylinder 120 is provided with an internal thread matched with the external thread of the screw 110;

one or more sliding grooves 140 are formed in the side wall of the outer cylinder 120, and each sliding groove 140 includes an anastomosis point and an anastomosis position; the outer cylinder 120 is preferably circular, and in other embodiments, the outer cylinder 120 may be elliptical, polygonal or other special-shaped structures, wherein the anchor holes corresponding to the outer cylinder 120 with the elliptical, polygonal or other special-shaped structures are arranged according to the shape of the outer cylinder 120, and may be formed by finish machining or one-step casting, for example, applied to assembly of toys, and the like, and is suitable for more applications.

One or more movable blocks 130 are provided, one end of each movable block 130 is provided with a shaft part 210, the other end of each movable block 130 is provided with a lug part 220, the shaft parts 210 of the movable blocks 130 are arranged in the matching points, and the lug parts 220 are movably arranged in the matching positions;

after the screw 110 is screwed into the outer cylinder 120, the protrusion 220 of the movable block 130 is limited, so that part or all of the protrusion 220 protrudes out of the surface of the outer cylinder 120.

When the pendant and the veneer are required to be connected through the screw-in back bolt, firstly, a groove or a hole matched with the back bolt outer cylinder 120 is formed in the veneer, and preferably, an expansion groove is formed at the bottom of the groove or the hole of the veneer; the outer cylinder 120 of the screw-in back bolt is put into the groove or hole of the veneer, and the movable block 130 can move inwards and contract in the sliding groove 140 of the outer cylinder 120, so that the outer cylinder 120 can be smoothly placed in the groove or hole of the veneer, the screw 110 is screwed into the outer cylinder 120, the movable block 130 is pushed along with the screw 110 screwing into the outer cylinder 120, so that the lug part 220 of the movable block 130 slides outwards along the inosculation position, when the screw 110 is screwed well, the lug part 220 of the movable block 130 is embedded into the expanding groove of the groove or hole of the veneer, and then is fastened through the nut, the lug part 220 of the movable block 130 is limited through the screw 110, so that part or all of the lug part 220 protrudes out of the surface of the outer cylinder 120, thereby realizing the very reliable connection between the back bolt and the veneer, and because the movable block 130 is matched with the sliding groove 140 of the cylinder, the sliding of the movable block 130 can not generate stress on the veneer, the veneer is not damaged, and the external resistance generated to the rotation of the screw 110 is not generated, so that the screw 110 is screwed into the outer cylinder 120 more conveniently and rapidly. When the screw-in back bolt is used as an anchor bolt applied to a wall body, the anchor hole formed in the wall body does not need to be provided with an expanding groove.

In this embodiment, in order to increase the pulling resistance of the outer barrel 120, the sliding grooves 140 on the sidewall of the outer barrel 120 are arranged in one or more layers, and each layer is provided with one or more sliding grooves 140. By arranging a plurality of sliding grooves 140 on the outer cylinder 120, and arranging the sliding grooves 140 on the outer cylinder 120 in one or more layers, the back bolt can be firmer on the veneer. Wherein, as on the veneer, because the veneer is thinned, a layer of chutes 140 is arranged on the outer cylinder 120, and the chutes 140 can be annularly distributed on the surface of the outer cylinder 120; for example, two sliding grooves 140 may be provided on the outer cylinder 120 to face each other, three sliding grooves 140 may be provided in a triangular distribution, and more sliding grooves 140 may be provided; for thicker walls, the cylinder may be provided with a single layer of annularly distributed chutes 140, or may be provided with chutes 140 in layers, where the protruding lengths of the protruding portions 220 of the movable blocks 130 between different layers are different, such as being tapered when all the protruding portions 220 protrude; the sliding grooves 140 are arranged in layers, and the sliding grooves 140 in different layers can be distributed at intervals.

In this embodiment, in order to facilitate the screw 110 to screw into the outer cylinder 120, the screw 110 is provided with a screw opening, and the screw opening is a hexagonal screw head, an inner hexagonal groove, a straight screw opening, a cross screw opening or a special screw opening. The screw rod 110 with different screw openings can be selected according to different requirements, so that different requirements can be met. In other embodiments, a hook structure may be disposed at the top end of the screw 110, and the screw 110 may be assisted to be screwed into the outer cylinder 120 by the hook structure, and other devices may be hung by the hook structure, for example, the hook structure is applied to hanging articles such as a water heater, a photo frame, clothes, and ornaments.

As shown in fig. 3 to 4, in the present embodiment, when the outer cylinder 120 has a circular shape, the screw 110 is screwed into the outer cylinder 120 more conveniently. When the outer cylinder 120 is circular, the surface of the outer cylinder 120 is provided with external threads, or the top end of the outer cylinder 120 is provided with a positioning countersunk head. When the shape of urceolus 120 is circular to set up the external screw thread on the surface, can be through using set nut 150 cooperation urceolus 120 to go up the external screw thread, make set nut 150 and urceolus 120 threaded connection, and after urceolus 120 imbeds the slotted hole of decorative board or wall body, because set nut 150 imbeds the corresponding slotted hole in decorative board or the wall body simultaneously, fix a position urceolus 120 through set nut 150, make screw rod 110 when precessing urceolus 120, urceolus 120 can not rotate, and make screw rod 110 more conveniently precession urceolus. Or the top end of the outer cylinder 120 is provided with the positioning countersunk head 160, and when the positioning countersunk head 160 can be embedded into a groove hole of a veneer or a wall, the outer cylinder 120 is fixed in the groove or the hole of the veneer or the wall, so that the outer cylinder 120 cannot rotate in the screwing process of the screw 110. And set up the location mouth on the surface of urceolus 120, make things convenient for the use tool to clip or block urceolus 120 for when screw rod 110 precession urceolus 120, urceolus 120 is difficult to rotate, makes things convenient for screw rod 110 to precession urceolus 120, and preferably, the location mouth sets up the top at the urceolus, and wherein, the location mouth can be for the vertical section that sets up on urceolus 120, makes things convenient for the anchor clamps to clip urceolus 120, and the location mouth also can be for setting up slotted hole etc. on urceolus 120. Meanwhile, the positioning of the depth of the outer cylinder 120 in the groove or hole of the veneer or the wall body, etc. can be achieved by the positioning nut 150 or the positioning countersunk head 160. It should be noted that the surface of the outer cylinder 120 is provided with an external thread or a positioning opening, or the top end of the outer cylinder 120 is provided with a positioning countersunk head, and is connected with a matched connecting piece when in use and installation, and the connecting piece is provided with a positioning device engaged with the positioning opening or the positioning countersunk head, so that the screw can be screwed conveniently; the purpose of the description is that the positioning opening and the positioning countersunk head are clamped and positioned by tools and can be arranged to be occluded and positioned with the connecting piece, and the purpose is to facilitate the screwing of the screw rod.

In this embodiment, in order to facilitate the sliding of the protrusion portion 220 of the movable block 130 at the matching position, the matching point is spherical, and the shaft portion 210 of the movable block 130 is spherical. The shaft portion 210 of the movable block 130 is connected to the engagement point of the sliding groove 140 by making the movable block 130 and the engagement point spherical, and when the screw 110 is screwed into the outer cylinder 120 to drive the movable block 130, the protrusion portion 220 of the movable block 130 can slide outwards around the shaft portion 210 and the engagement point at the engagement position. In other embodiments, the shaft portion 210 of the movable block 130 may be a circular plate, a hemisphere, a semicircular plate, or other shapes that can realize the shaft portion 210 being inserted into the matching point of the sliding slot 140 to realize the rotation of the protrusion portion 220 around the shaft portion 210; the matching point is formed in a corresponding shape according to the shaft portion 210. In other embodiments, the movable block may slide in the anastomosis site in other manners, for example, the anastomosis point is set as a track, the shaft portion of the movable block is set in the track, and the protrusion portion of the movable block can slide in the anastomosis site along the anastomosis point.

In this embodiment, in order to facilitate the installation of the outer cylinder 120 in the slot of the veneer or the wall, an adhesive tape, a rope or a member with elasticity for limiting the movable block 130 is disposed on the outer wall of the outer cylinder 120; or a magnet is provided on the inner side of the movable block 130 to attract the movable block. Through being equipped with the sticky tape, the rope or the component that has elasticity of restriction movable block 130 on the outer wall of urceolus 120 for when urceolus 120 is installed on the slotted hole of decorative board or wall body, the installation of urceolus 120 is influenced not to protruding urceolus 120 of lug portion 220, and after installing urceolus 120, when the precession of screw rod 110 made lug portion 220 outwards slide, can just break sticky tape, rope or other elastic component very easily, sticky tape, the effect of rope and elastic component just avoids lug portion 220 to influence the installation of urceolus 120 when urceolus 120 is installed promptly. In other embodiments, when there are a plurality of movable blocks 130, a magnet is disposed on the inner side of the movable block 130 to attract the movable blocks, so that when the connecting rod of the movable block 130 is in the cylinder, the connecting rod attracts due to the action of the magnet and is retracted into the outer cylinder 120, thereby facilitating the installation of the outer cylinder 120, and when the screw 110 is screwed into the outer cylinder 120, the connecting rod pushes away the mutually connected movable blocks 130, thereby pushing the protrusion portions 220 of the movable blocks 130 to slide outwards.

In this embodiment, in order to prevent the screw 110 from being excessively screwed into the outer cylinder 120 to damage the veneer or the wall, the outer cylinder 120 is provided with a limiting block or the screw 110 is provided with a limiting indication point. By arranging the limiting block at the bottom of the outer cylinder 120, when the screw 110 is screwed into the outer cylinder 120, the screw 110 cannot advance after being screwed into a certain position of the outer cylinder 120 due to the action of the limiting block, and the situation that the veneer or the wall is damaged due to the fact that the screw 110 is excessively screwed into the outer cylinder 120 cannot occur. Or a limit indicating point is arranged on the screw 110, and the position of the screw 110, which needs to be screwed into the outer cylinder 120, can be known according to the limit indicating point on the screw 110, so that the damage to the veneer or the wall caused by the excessive screwing of the screw 110 into the outer cylinder 120 is avoided.

In this embodiment, in order to facilitate the extraction of the back bolt, the upper surface of the projection portion 220 of the movable block 130 is an inclined surface. When the back bolt needs to be pulled out, the screw 110 is screwed out of the outer cylinder 120, and when the outer cylinder 120 is pulled out, because the upper surface of the bump part 220 is an inclined surface, the bump part 220 can be contracted into the inner part of the outer cylinder 120 in the process of pulling out the outer cylinder 120, so that the outer cylinder 120 can be pulled out smoothly. The screw rod 110 is screwed into the outer cylinder 120 to open the movable block 130, and the screw rod 110 is screwed out, because the movable block 130 is provided with a slope, when the outer cylinder 120 is pulled out, the movable block 130 is shifted and contracted towards the center of the screw hole of the outer cylinder 120 due to the resistance of the inner wall of the groove hole, so that the outer cylinder 120 can be easily pulled out, which is completely different from the traditional back bolt stress system.

In this embodiment, the screw rod 110 is used as a stressed anchor bolt to connect with a pendant or other devices, and one or more fixing nuts are arranged on the screw rod 110; when the veneer or the wall or other products are connected with other devices, the outer cylinder 120 is inserted into the slot of the veneer or the wall or other products and is flush with the slot, and then the other devices are fastened through the fixing nuts on the screws 110. As shown in fig. 5, in other embodiments, when the outer cylinder 120 is a force bolt for connecting other devices, the surface of the outer cylinder 120 is provided with external threads, and the outer cylinder 120 is provided with one or more fixing nuts 170 threadedly coupled with the outer cylinder 120. After the outer cylinder 120 is inserted into a slot of a veneer or a wall or other products, a part of the outer cylinder 120 is outside the veneer or the wall or other products, and when the screw 110 is screwed into the outer cylinder 120, the screw 110 is flush with or slightly beyond the outer cylinder 120, and then the fixing nut 170 on the outer cylinder 120 is used for fastening other devices, so that the veneer or the wall or other products are connected with other devices. According to the actual shearing resistance requirement, the screw-in back bolt with the stress-free function and taking the outer cylinder 120 as the stressed anchor rod can be selected as the screw-in back bolt with the stress-free function and taking the screw rod 110 as the stressed anchor rod can be selected as the bolt with the strong shearing resistance, so that the screw-in back bolt with the stress-free function has the structure that the outer cylinder 120 is stressed or the mechanism that the screw rod 110 is stressed, and a user can select the bolt according to the actual requirement, so that the user has multiple choices. When the screw 110 is used as a force-bearing anchor bolt to connect with a pendant or other devices, the screw 110 is provided with a fixing nut to connect with the pendant or other devices, the outer cylinder 120 is provided with a positioning nut 150 in threaded connection with the outer cylinder 120, and the outer cylinder 120 is fixed in a control panel or a wall body through the positioning nut 150, so that the screw 110 can be conveniently screwed into the outer cylinder 120.

In this embodiment, since the veneer or the wall has no elasticity, when the veneer or the wall vibrates, the back bolt is easy to damage the veneer or the wall, and in order to avoid damage to the veneer or the wall when the veneer or the wall vibrates, the outer cylinder 120 or/and the movable block 130 have a vibration-proof layer on the surface. When the veneer or the wall body vibrates, the back bolt can be effectively prevented from damaging the veneer or the wall body through the buffer action of the shockproof layer on the surface of the outer cylinder 120 or/and the movable block 130. The shockproof layer can be made of rubber, carbon fiber composite materials and the like.

In this embodiment, in order to further increase the pulling resistance of the back plug, when the outer cylinder 120 is circular, the protruding portion 220 of the movable block 130 is arc-shaped, and by setting the protruding portion 220 to be arc-shaped with the same arc as the circular outer cylinder 120, the longer protruding portion 220 can be set to enhance the pulling resistance of the back plug.

In this embodiment, in order to increase the pulling resistance of the outer cylinder 120 by making the protruding portion 220 slide the farthest, the movable block 130 is provided with an extending rib. Set up the extension muscle on movable block 130, extend the muscle and connect in axial region 210 to the extension muscle sets up inside the drum, when screw rod 110 precession drum is inside, screw rod 110 withstands the extension muscle, and then promotes movable block 130, makes lug portion 220 outwards slide in the position that coincide, makes lug portion 220 can slide to the outer farther distance of urceolus 120 simultaneously, makes urceolus 120 firmly block in the inslot of decorative board or wall body.

In this embodiment, when used in a thicker wall connector, in order to further increase the pulling resistance of the back bolt, the outer barrel 120 is provided with branches, and the branches form a barb structure at the bottom of the outer barrel 120. By arranging the branch bars on the outer barrel 120 of the back bolt, wherein the branch bars form a barb structure on the surface of the outer barrel 120, after the outer barrel 120 is driven into a wall body, the branch bars are more firmly arranged on the wall body through the branch bars on the surface of the outer barrel 120, and the anti-pulling capacity of the back bolt is improved.

It should be noted that, the installation method of the screw-in back bolt with the unstressed function of the present invention is preferably as follows:

1. matched anchor holes are arranged on the corresponding veneer or wall, and preferably grooves are expanded at the positions of the anchor holes corresponding to the lug parts.

2. An outer cylinder which is used for pinching the lug part of the movable block arranged on the outer cylinder towards the inner part of the outer cylinder until the outer surface is flush or the lug part of the movable block is flush with the outer surface,

3. and the lug part is arranged at the position corresponding to the anchor hole slot expanding position.

4. Clamping the outer cylinder, screwing the screw rod until the lug part moves from inside to outside in a limiting way until part or all of the lug part moves into the expanding groove, and releasing the clamping point.

5. The connecting piece is screwed on the nut on the screw rod or the outer barrel through the screw, until the distance between the lug part and the nut is tightened, the lug part and the expanded groove are fastened through the clamping effect, or the connecting piece is directly screwed on the nut on the screw rod or the outer barrel, until the distance between the lug part and the nut is tightened, and the connecting piece is fastened through the clamping effect of the lug part and the expanded groove.

Can also establish into the structure in advance in anchor eye in advance and glue in practical application, will again a precession formula back of the body bolt with unstressed function install the fastening to it is better to treat that its tensile pulling resistance effect is pulled out after the structure gluing is solid.

A precession formula back of body is tied with unstressed function, when the movable block was equipped with one deck to multilayer, its mounting method:

1. and matched anchor holes (the groove can be expanded or not expanded at the positions of the corresponding convex block parts of the anchor holes) are arranged on the corresponding wall bodies.

3. and the lug part is inserted into the matched anchor hole and enters a preset position corresponding to the anchor hole.

The connecting piece is screwed on the nut on the screw rod or the outer barrel through the screw, until the distance between the lug part and the nut is tightened, the lug part and the expanded groove are fastened through the clamping effect, or the connecting piece is directly screwed on the nut on the screw rod or the outer barrel, until the distance between the lug part and the nut is tightened, and the connecting piece is fastened through the clamping effect of the lug part and the expanded groove.

It should be noted that, although the above embodiments have been described herein, the scope of the present invention is not limited thereby. Therefore, based on the innovative concept of the present invention, the changes and modifications of the embodiments described herein, or the equivalent structure or equivalent process changes made by the contents of the specification and the drawings of the present invention, directly or indirectly apply the above technical solutions to other related technical fields, all included in the scope of the present invention.

Claims

1. A screw-in back bolt with a stress-free function is characterized by comprising a screw rod, an outer cylinder and a movable block;

2. A screw-in back bolt with stress-free function according to claim 1, wherein the sliding grooves on the side wall of the outer barrel are arranged in one or more layers, and each layer is provided with one or more sliding grooves.

3. A precession back bolt with unstressed function according to claim 1, characterised in that the outer barrel is circular, polygonal or elliptical in shape.

4. The back bolt with stress-free function of the claim 3, wherein when the outer cylinder is round in shape, the surface of the outer cylinder is provided with external thread or positioning opening, or the top end of the outer cylinder is provided with positioning countersunk head.

5. The screw-in type back bolt with stress-free function according to claim 1, wherein the anastomotic point is spherical and the shaft of the movable block is spherical.

6. The precession type back bolt with unstressed function according to claim 1, wherein an adhesive tape, a rope or a member with elasticity for limiting the movable block is provided on the outer wall of the outer cylinder; or the inner side of the movable block is provided with a magnet which enables the movable block to attract each other.

7. A screw-in back bolt with non-stress function according to claim 1, wherein the outer cylinder is provided with a limiting block or the screw rod is provided with a limiting indication point.

8. The screw-in back bolt with the stress-free function according to claim 1, wherein the upper surface of the projection part of the movable block is an inclined surface.

9. A screw-in back bolt with stress-free function according to claim 1, wherein one or more fixing nuts are provided on the screw rod; or one or more fixing nuts in threaded connection with the outer cylinder are arranged on the outer cylinder.

10. The back bolt with stress-free function of the claim 1, wherein the surface of the outer cylinder or/and the movable block is provided with a shock-proof layer.