Expansion screw

Abstract

The utility model relates to the technical field of expansion screws, in particular to an expansion screw which comprises a nut and an expansion pipe, a screw rod is fixedly connected to the bottom of the nut in a welding mode, the expansion pipe is installed on the outer side of the screw rod, and a gasket is fixedly connected to the upper end of the expansion pipe. The screw rod comprises a screw rod body, a mounting groove is formed in the outer side of the screw rod body, an elastic element is fixedly connected to the inner side of the mounting groove in a bonding mode, the elastic element comprises an elastic element body, an elastic blind hole is formed in the inner side of the elastic element body, and a supporting node is fixedly connected to the inner side of the elastic blind hole; the gasket comprises a rotating shaft, a clamping ring is fixedly connected to the bottom of the rotating shaft in a welded mode, and an arc-shaped protruding block is fixedly connected to the bottom of the clamping ring in an integrated forming mode. The internal structure enhances the stability and durability, and ensures the anchoring effect.

Description

TECHNICAL FIELD

[0001] The utility model relates to expansion screw technical field, concretely is a kind of expansion screw. BACKGROUND

[0002] Expansion screw generally refers to expansion bolt, it is a kind of special screw thread connecting piece used to fix pipe support, hang, bracket or equipment on wall, floor, column, expansion pipe after expansion is tightly extruded on hole wall, form larger friction and anchoring force, to connect fixed object firmly on matrix material;

[0003] In home decoration, commercial building decoration and bridge construction etc., expansion screw is widely used in the installation and fixation of various facilities;

[0004] Bridge as traffic hub, bears frequent and huge traffic load, when vehicle travels on bridge, these forces are transmitted to each structural component of bridge through bridge deck, when heavy truck passes through bridge, larger vertical impact force is generated, this impact force can make the friction between expansion screw and bridge structure reduce instantaneously, to cause screw to have tiny displacement, with the continuous passing of vehicle, this tiny displacement can gradually accumulate, reduce its anchoring effect;

[0005] Therefore, aiming at the above problems, an expansion screw is provided. UTILITY MODEL CONTENTS

[0006] The utility model aims at providing an expansion screw to solve the problem that when heavy truck passes through bridge, larger vertical impact force is generated, to cause screw to have tiny displacement, with the continuous passing of vehicle, this tiny displacement can gradually accumulate, finally lead to expansion screw loosening.

[0007] To achieve the above object, the utility model provides the following technical scheme:

[0008] An expansion screw, including nut and expansion pipe, the nut bottom is fixedly connected with screw rod by welding mode, the screw rod outside is installed with expansion pipe, and the expansion pipe upper end is fixedly connected with gasket;The screw rod includes screw rod main body, the screw rod main body outside is equipped with installation slot, and the installation slot inside is fixedly connected with elastic element by sticking mode, the elastic element includes elastic element main body, the elastic element main body inside is equipped with elastic blind hole, and the elastic blind hole inside is fixedly connected with support node;The gasket includes pivot, the pivot bottom is fixedly connected with snap ring by welding mode, the snap ring bottom is fixedly connected with arc-shaped lug by integral forming mode, the expansion pipe upper end is fixedly connected with connecting ring, and the connecting ring upper end is equipped with arc-shaped groove.

[0009] As the further optimization of the utility model, wherein: the rotating shaft is arranged on the outer side of the upper end of the screw body, the upper end of the rotating shaft is rotationally connected with the bottom of the nut, the rotating shaft is arranged in a ring shape, the vertical cross section of the rotating shaft is square, and the diameter of the rotating shaft is equal to that of the bottom of the nut.

[0010] As the further optimization of the utility model, wherein: the center points of the clamping ring and the connecting ring are on the same vertical line, the clamping ring and the connecting ring are arranged in an up-down symmetry, the clamping ring and the connecting ring are parallel to each other, and the clamping ring and the connecting ring are arranged on the outer side of the screw body.

[0011] As the further optimization of the utility model, wherein: the arc-shaped protrusions and the arc-shaped grooves are arranged in a plurality of sets, the arc-shaped protrusions and the arc-shaped grooves are distributed in a circular array with the center of the bottom of the clamping ring as the axis, the arc-shaped protrusions are uniformly and equidistantly distributed on the bottom of the clamping ring, the arc-shaped grooves are uniformly and equidistantly distributed on the upper end of the connecting ring, and the arc-shaped protrusions and the arc-shaped grooves are clamped to each other.

[0012] As the further optimization of the utility model, wherein: the mounting grooves and the elastic elements are arranged in a plurality of sets, the mounting grooves and the elastic elements are distributed in a circular array with the center of the bottom of the clamping ring as the axis, the vertical cross section of the mounting groove and the elastic element is arranged in a fan shape, and the arc-shaped side of the elastic element is tightly attached to the inner side of the expansion pipe.

[0013] As the further optimization of the utility model, wherein: the elastic blind holes are arranged in a plurality of sets, the cross section of the elastic blind hole is arranged in a hexagonal shape, and the elastic blind holes are uniformly and equidistantly distributed in the interior of the elastic element body.

[0014] As the further optimization of the utility model, wherein: the support nodes are arranged in a plurality of sets, the support nodes are arranged in a spherical shape, the support nodes are uniformly and equidistantly distributed on the connecting nodes of the hexagonal units of the elastic blind holes, and the support nodes are parallel to each other in the vertical direction.

[0015] Compared with the prior art, the utility model has the advantages of:

[0016] In the utility model, when the heavy truck passes through the bridge, the screw serves as a force transmission link to stably transmit the load and ensure the system coherence, and the elastic element plays a buffering and adjusting function, adjusts the expansion degree according to the load change, absorbs the impact force, and relieves the vibration, the internal structure is enhanced in stability and durability, the gaskets uniformly transmit the pressure, the expansion pipe uniformly expands and tightly fits the base body, the anchoring force is enhanced, the direct friction between the nut and the expansion pipe is avoided, the expansion pipe is protected, the expansion screw stably anchors the bridge structure when the heavy truck passes, effectively resists the vibration impact, and guarantees the safety and stability of the bridge. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the whole structure schematic view of the utility model;

[0018] Figure 2 It is the nut dismounting structure schematic view of the utility model;

[0019] Figure 3 It is the screw rod dismounting structure schematic view of the utility model;

[0020] Figure 4 It is the whole structure schematic view of the utility model elastic element;

[0021] Figure 5 It is the utility model Figure 4 Structure schematic view of A place in the middle.

[0022] Figure: 1, nut;

[0023] 2, screw rod; 21, screw rod main body; 22, installation groove; 23, elastic element; 231, elastic element main body; 232, elastic blind hole; 233, support node;

[0024] 3, expansion pipe;

[0025] 4, gasket; 41, rotating shaft; 42, snap ring; 43, arc-shaped lug; 44, connecting ring; 45, arc-shaped groove. Specific embodiments

[0026] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0027] It should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and furthermore, it should be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, operation, device, component and / or combination thereof.

[0028] Please refer to Figures 1-5 The utility model provides a technical scheme:

[0029] The utility model provides an expansion screw, including nut 1 and expansion pipe 3, the bottom of nut 1 is fixedly connected with screw rod 2 through the mode of welding, the outside of screw rod 2 is installed with expansion pipe 3, and the upper end of expansion pipe 3 is fixedly connected with gasket 4;Screw rod 2 includes screw rod main body 21, and the outside of screw rod main body 21 is provided with installation groove 22, and the inside of installation groove 22 is fixedly connected with elastic element 23 through the mode of sticking, and elastic element 23 includes elastic element main body 231, and the inside of elastic element main body 231 is provided with elastic blind hole 232, and the inside of elastic blind hole 232 is fixedly connected with support node 233;Gasket 4 includes pivot 41, and the bottom of pivot 41 is fixedly connected with snap ring 42 through the mode of welding, and the bottom of snap ring 42 is fixedly connected with arc convex block 43 through the mode of integral forming, and the upper end of expansion pipe 3 is fixedly connected with connecting ring 44, and the upper end of connecting ring 44 is provided with arc slot 45.

[0030] As the further implementation of the above technical scheme: the arc convex block 43 and the arc slot 45 are provided with a plurality of arc convex blocks 43 and arc slots 45, and the arc convex block 43 and the arc slot 45 are distributed in a circular array with the center of the bottom of the snap ring 42 as the axis, the arc convex block 43 is uniformly and equidistantly distributed on the bottom of the snap ring 42, the arc slot 45 is uniformly and equidistantly distributed on the upper end of the connecting ring 44, the arc convex block 43 and the arc slot 45 are clamped with each other, the arc convex block 43 cooperates with the arc slot 45, and during the tightening process of the nut 1, the pressure can be uniformly transmitted to the upper end of the expansion pipe 3, the damage of the expansion pipe 3 caused by excessive local stress can be avoided, the uniform expansion of the expansion pipe 3 can be ensured, and the anchoring effect is improved.

[0031] As the further implementation of the above technical scheme: the center points of the snap ring 42 and the connecting ring 44 are on the same vertical line, the snap ring 42 and the connecting ring 44 are symmetrically arranged in an up-down manner, the snap ring 42 and the connecting ring 44 are parallel to each other, and the snap ring 42 and the connecting ring 44 are arranged on the outside of the screw rod main body 21, so that the nut 1 can be prevented from directly contacting the expansion pipe 3 during long-term use, the damage of the upper end of the expansion pipe 3 caused by friction can be reduced, and the service life of the expansion pipe 3 is prolonged.

[0032] As the further implementation of the above technical scheme: the installation groove 22 and the elastic element 23 are provided with a plurality of installation grooves 22 and elastic elements 23, the installation groove 22 and the elastic element 23 are distributed in a circular array with the center of the bottom of the snap ring 42 as the axis, the vertical section of the installation groove 22 and the elastic element 23 is provided with a fan shape, one side of the arc shape of the elastic element 23 is tightly attached to the inside of the expansion pipe 3, the uniform extrusion of the elastic element 23 can be ensured through reasonable groove body design, and the uniform expansion of the expansion pipe 3 is further driven.

[0033] As a further implementation of the above technical solution: the support node 233 is provided with several, the shape of the support node 233 is spherical, the support node 233 is uniformly and equidistantly distributed at the connecting node of the elastic blind hole 232 hexagonal unit, the support node 233 is perpendicular to each other, the support node 233 can disperse stress, prevent the elastic element 23 from appearing excessive deformation or damage in local, ensure that the elastic element 23 can continuously and stably provide expansion force;

[0034] As a further implementation of the above technical solution: the rotating shaft 41 is arranged on the outer side of the upper end of the screw body 21, the upper end of the rotating shaft 41 is rotationally connected with the bottom of the nut 1, the rotating shaft 41 is arranged in a ring shape, the shape of the vertical section of the rotating shaft 41 is square, the diameter of the rotating shaft 41 is equal to the diameter of the bottom of the nut 1, which can enhance the structural stability of the whole system, make the components work better, and improve the reliability of the expansion screw under various working conditions;

[0035] As a further implementation of the above technical solution: the elastic blind hole 232 is provided with several, the shape of the cross section of the elastic blind hole 232 is hexagonal, the elastic blind hole 232 is uniformly and equidistantly distributed in the inside of the elastic element body 231, the elastic element 23 can expand more uniformly in the deformation process, improve the anchoring reliability and durability of the expansion screw.

[0036] Work flow: first, drill a hole of appropriate size on the base body where the expansion screw needs to be installed, insert the expansion tube 3 into the pre-drilled hole to prepare for the subsequent insertion of the screw rod 2, then insert the screw rod 2 with the elastic element 23 into the expansion tube 3, so that the elastic element 23 in the installation groove 22 of the screw rod 2 is in contact with the inside of the expansion tube 3, then install the gasket 4 on the screw rod 2, align the connecting ring 44 of the gasket 4 with the upper end of the expansion tube 3, ensure that the arc-shaped groove 45 on the connecting ring 44 corresponds with the arc-shaped protrusion 43 at the bottom of the clamping ring 42 of the gasket 4, then use the tool to tighten the nut 1 clockwise, the nut 1 rotates and moves downward, driving the screw rod 2 to move downward together, as the screw rod 2 moves downward, the elastic element 23 on the outside of the screw rod 2 is extruded by the inner wall of the expansion tube 3, and can uniformly expand to all directions when being extruded, thereby driving the expansion tube 3 to uniformly expand, ensuring that the friction between the expansion tube 3 and the hole wall is uniformly distributed, improving the anchoring effect, at this time, the elastic element main body 231 of the elastic element 23 begins to deform, and the elastic blind hole 232 and the support node 233 provided play a role in supporting and dispersing stress during the deformation of the elastic element 23, the elastic blind hole 232 provides good structural stability while ensuring that the elastic element 23 has a certain elastic deformation capacity through its hexagonal structure design, and the support node 233 plays a role in supporting and dispersing stress during the deformation of the elastic element 23, preventing the elastic element 23 from being excessively deformed or damaged locally, and ensuring that the elastic element 23 can continuously and stably provide expansion force, at the same time, the downward movement of the screw rod 2 also causes the arc-shaped protrusion 43 at the bottom of the clamping ring 42 of the gasket 4 to slide along the arc-shaped groove 45 on the upper end of the connecting ring 44, ensuring that the gasket 4 can smoothly follow the movement during the downward movement of the screw rod 2, and playing a role in uniformly transmitting pressure during the expansion of the expansion tube 3, preventing the expansion tube 3 from being damaged due to excessive local stress, continue to tighten the nut 1 until the elastic element 23 is fully expanded and the expansion tube 3 is tightly extruded against the hole wall, at this time the expansion screw reaches the maximum anchoring force and the installation is completed, when external tension acts on the screw rod 2, the tension is transmitted to the screw rod 2 through the nut 1, and the screw rod 2 transmits the tension to the elastic element 23 and the expansion tube 3, the expansion force of the elastic element 23 and the friction between the expansion tube 3 and the hole wall jointly resist the external tension, ensuring that the expansion screw will not be pulled out.

[0037] Although the embodiments of the present application have been shown and described, it should be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. An expansion screw comprising a nut (1) and an expansion tube (3), characterized in that: The nut (1) bottom is fixedly connected with screw rod (2) by welding, the outer side of screw rod (2) is provided with expansion pipe (3), the upper end of expansion pipe (3) is fixedly connected with gasket (4); The screw rod (2) comprises a screw rod body (21), an installation slot (22) is formed in the outer side of the screw rod body (21), and an elastic element (23) is fixedly connected to the inner side of the installation slot (22) by adhesion, the elastic element (23) comprises an elastic element body (231), an elastic blind hole (232) is formed in the inner side of the elastic element body (231), and a support node (233) is fixedly connected to the inner side of the elastic blind hole (232); The gasket (4) comprises a rotating shaft (41), the bottom of the rotating shaft (41) is fixedly connected with a snap ring (42) by welding, the bottom of the snap ring (42) is fixedly connected with an arc-shaped lug (43) by integral molding, the upper end of the expansion pipe (3) is fixedly connected with a connecting ring (44), and the upper end of the connecting ring (44) is provided with an arc-shaped groove (45).

2. An expansion screw according to claim 1, wherein: The rotating shaft (41) is arranged on the outer side of the upper end of the screw rod body (21), the upper end of the rotating shaft (41) is rotatably connected with the bottom of the nut (1), the rotating shaft (41) is arranged in a ring shape, the shape of the vertical section of the rotating shaft (41) is square, and the diameter of the rotating shaft (41) is equal to the diameter of the bottom of the nut (1).

3. An expansion screw according to claim 1, wherein: The center points of the snap ring (42) and the connecting ring (44) are on the same vertical line, the snap ring (42) and the connecting ring (44) are arranged in an upper-lower symmetrical mode, the snap ring (42) and the connecting ring (44) are parallel to each other, and the snap ring (42) and the connecting ring (44) are arranged on the outer side of the screw rod body (21).

4. An expansion screw according to claim 1, wherein: The arc-shaped lugs (43) and the arc-shaped grooves (45) are arranged in a plurality of groups, the arc-shaped lugs (43) and the arc-shaped grooves (45) are distributed in a circular array with the center of the bottom of the snap ring (42) as the axis, the arc-shaped lugs (43) are uniformly and equidistantly distributed on the bottom of the snap ring (42), the arc-shaped grooves (45) are uniformly and equidistantly distributed on the upper end of the connecting ring (44), and the arc-shaped lugs (43) and the arc-shaped grooves (45) are clamped with each other.

5. An expansion screw according to claim 1, wherein: The installation slots (22) and the elastic elements (23) are arranged in a plurality of groups, the installation slots (22) and the elastic elements (23) are distributed in a circular array with the center of the bottom of the snap ring (42) as the axis, the shape of the vertical section of the installation slots (22) and the elastic elements (23) is arranged in a fan shape, and the arc-shaped side of the elastic element (23) is tightly attached to the inner side of the expansion pipe (3).

6. An expansion screw according to claim 1, wherein: The elastic blind holes (232) are arranged in a plurality of groups, the shape of the cross section of the elastic blind holes (232) is arranged in a hexagon, and the elastic blind holes (232) are uniformly and equidistantly distributed in the interior of the elastic element body (231).

7. An expansion screw according to claim 1, wherein: The support nodes (233) are arranged in a plurality of groups, the support nodes (233) are arranged in a spherical shape, the support nodes (233) are uniformly and equidistantly distributed at the connecting nodes of the hexagonal units of the elastic blind holes (232), and the support nodes (233) are parallel to each other in the vertical direction.

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