Expansion device

Abstract

According to the technical scheme, the expansion device is characterized by comprising a sleeve, a contraction and expansion device is arranged on the sleeve, the contraction and expansion device comprises one or two or more expansion strips arranged on the sleeve, when an expansion piece enters or penetrates through the contraction and expansion device, the expansion strips expand outwards, grooves are formed in the outer sides of the expansion strips, and the expansion strips are sleeved with the grooves. A groove is formed in the expansion strip, the groove extends in the length direction of the expansion strip, one or two or more clamping pieces are arranged in the groove of the expansion strip, so that the grating type expansion strip is formed, and the clamping pieces are arranged in the groove at intervals. When the grating type expansion strip expands, the clamping pieces and the hole wall form multi-point locking, the overall drawing bearing capacity is effectively improved, the fitting degree and friction force between the expansion device and a wall material are improved, and the expansion device can still keep a good fixing effect under the condition of bearing high loads or vibration or dynamic loads.

Description

Technical Field

[0001] The invention relates to the technical field of expansion bolts, and more particularly to an expansion device. Background Art

[0002] In the field of construction and engineering, expansion bolts are a commonly used fastener and are widely used in various occasions where structures need to be fixed or connected. The working principle of expansion bolts mainly depends on their expansion devices. When expansion parts such as bolts or pins enter the expansion device, the expansion device can expand outward and produce a tight mechanical bite with the wall of the installation hole, thereby achieving a firm fixing effect.

[0003] Most traditional expansion devices use a simple one-way expansion bar structure, such as: U-shaped expansion bar, W-shaped expansion bar, S-shaped expansion bar, V-shaped expansion bar; that is, when the bolt rod enters, the expansion bar expands radially outward along the bolt, relying on the friction between the expansion bar and the wall hole wall to provide the necessary pulling force.

[0004] However, this simple one-way expansion strip structure mainly provides expansion force in a single direction, and its expansion capacity in other directions is relatively weak. In particular, it may not be able to meet the high requirements for pulling force in certain applications. In particular, when it needs to withstand large loads or vibration loads, traditional expansion devices are prone to loosening or falling off. Summary of the invention

[0005] To solve the above problems, the present invention provides the following technical solutions:

[0006] An expansion device comprises a sleeve, on which an expansion device is provided, the expansion device comprising one, two or more expansion strips arranged on the sleeve, when the expansion member enters or passes through the expansion device, the expansion strip expands outward, the outer side of the expansion strip is provided with a groove, the groove extends along the length direction of the expansion strip, the groove of the expansion strip is provided with one, two or more clips, thereby forming a grid-type expansion strip, and a plurality of the clips are arranged on the groove at intervals.

[0007] The present invention is further configured such that: the clamping piece is arranged perpendicularly or obliquely to the length direction of the grid-type expansion bar.

[0008] The present invention is further configured as follows: the side walls on both sides or one side of the groove are bent inward to form snap-in pieces, and the bending degrees of the snap-in pieces are the same or different. When the snap-in pieces are two or more and are set on one side, they are combined with the side walls to form a grid shape; when the snap-in pieces are two or more and are set on both sides, they are combined with the side walls to form a grid shape, and the two sides of the snap-in pieces are set symmetrically or staggered.

[0009] The present invention is further configured as follows: the shrinkage and expansion device includes one or two or more grid-type expansion bars arranged on the sleeve, or the shrinkage and expansion device includes one or two or more first expansion bars and one or two or more second expansion bars arranged on the sleeve, the first expansion bar is the grid-type expansion bar, the second expansion bar is one or more of a strip expansion bar, a serrated expansion bar, a U-shaped expansion bar, a W-shaped expansion bar, an S-shaped expansion bar, a V-shaped expansion bar, and a baffle, and the first expansion bar and the second expansion bar are arranged in combination and at intervals.

[0010] The present invention is further configured as follows: when the shrinkage and expansion device includes two or more grid-type expansion bars arranged on the sleeve, the number of the snap-fit ​​pieces of the grid-type expansion bars is different or the same, and the grid formed by the snap-fit ​​pieces and the grooves is a square grid, a trapezoidal grid or a polygonal grid.

[0011] The present invention is further configured as follows: when multiple snap-in pieces are provided on the grid-type expansion bar, each of the grid-type expansion bar generates multiple grids; when the shrinkage and expansion device includes two or more of the grid-type expansion bars provided on the sleeve, the grids between the two or more of the grid-type expansion bars are arranged in a surrounding manner, and the surrounding arrangement includes: any one of a surrounding spiral arrangement, a flush surrounding arrangement, and a staggered surrounding arrangement.

[0012] The present invention is further configured as follows: the grid-type expansion bar is arranged at one end of the sleeve or / and a grid-type expansion bar is arranged on the peripheral side of the sleeve, and one end of the grid-type expansion bar is connected to the peripheral side wall of the sleeve.

[0013] The present invention is further configured as follows: a bending portion is provided at one end of the grille-type expansion bar away from the connection with the sleeve, the bending portion is located on the outside of the grille-type expansion bar, the end of the bending portion is tilted outward, or the bending portion is sawtooth-shaped or corrugated and the end is tilted outward, or the bending portion is directly inclined upward or is sawtooth-shaped or corrugated; or\a bending portion is provided at one end of the grille-type expansion bar away from the connection with the sleeve, the bending portion is located on the outside of the grille-type expansion bar, and a snap-in piece is provided on the bending portion; the shape of the sleeve is circular, polygonal, plum blossom-shaped or wavy.

[0014] The present invention is further configured as follows: the inner surface or outer surface of the grille-type expansion bar or / and the strip-shaped expansion bar or / and the serrated expansion bar or / and the U-shaped expansion bar or / and the W-shaped expansion bar or / and the S-shaped expansion bar or / and the V-shaped expansion bar or / and the baffle is provided with concave patterns or / and convex patterns or / and nail-hammer patterns or / and nail-thorn patterns; or, the outer surface of the grille-type expansion bar or / and the strip-shaped expansion bar or / and the serrated expansion bar or / and the U-shaped expansion bar or / and the W-shaped expansion bar or / and the S-shaped expansion bar or / and the V-shaped expansion bar or / and the baffle is provided with fillers, and the fillers include one or more of metal materials, plastic materials, wood and bamboo materials, nylon materials, chemical hoses, carbonized wood and bamboo, and fibers; the clamping piece is arranged on the side of the concave patterns or / and convex patterns or / and nail-hammer patterns or / and nail-thorn patterns close to the sleeve.

[0015] The present invention is further configured as follows: glue is provided inside the sleeve, or / and when two or more of the grille-type expansion bars are provided on the sleeve, glue is provided between the grille-type expansion bars or / and glue is provided inside the grille; or, a through hole is reserved on the peripheral side wall of the sleeve and located at the setting position of the grille-type expansion bar or / and a through hole is opened on the peripheral side wall of the sleeve, and glue is planted into the sleeve through the through hole; or / and a sealant is provided on the head of the sleeve; the expansion member is provided with an anti-oxidation coating or / and stainless steel material is directly used.

[0016] The present invention is further configured as follows: the sleeve is provided with a screw thread or a clamping tooth that can allow the expansion member to enter and exit; one end of the combination of the expansion member and the expansion device is a spiral body or / and a nail or / and a barbed nail, and the other end is one of a bolt, a screw, a pointed nail, a sheep's head nail, a hook nail, a ball joint, a clamping nail, a positioning nail, a four-corner pressure nail, and a pipe clamp; the head end of the sleeve is provided with a balancing positioning fulcrum or / and a screw thread or / and a clamping tooth of the expansion member, or the head end of the sleeve is provided with a balancing positioning fulcrum of the expansion member, and the balancing positioning fulcrum can be used as a screw thread or / and a clamping tooth.

[0017] The present invention is further configured as follows: a gasket bent inwardly is provided on the left side or / and the right side of the grid-type expansion bar, and the gasket is provided with one or two or more gaskets.

[0018] The present invention is further configured as follows: the gasket is arranged on the left or right side of the grid-type expansion bar, the gasket is tightly attached to the inner surface of the grid-type expansion bar as a whole or integrated as a whole or is flush with the inner surface of the grid-type expansion bar or is set with a reserved gap, and the gasket is bent along the thread direction of the expansion member; when the expansion member enters or passes through the shrinking device, the gasket is located at the protrusion or recess of the thread of the expansion member.

[0019] The present invention is further configured as follows: a glue attachment device for carrying glue is provided at the tail end of the expansion device, the glue attachment device is made of metal, nylon or plastic, or the expansion device is used in conjunction with a chemical hose.

[0020] Compared with the prior art, the present invention has at least the following advantages:

[0021] 1. By setting a clamping piece on the expansion bar to form a grid-type expansion bar, when the expansion bar expands, the clamping piece and the hole wall form a multi-point locking, which effectively improves the overall pull-out bearing capacity, improves the fit and friction between the expansion device and the wall material, and enables the expansion device to maintain a good fixing effect when subjected to high load, vibration or dynamic load conditions, reducing the risk of loosening;

[0022] 2. The design of grid-type expansion bars is suitable for a variety of wall materials, including but not limited to concrete, brick walls and lightweight panels. By adjusting the shape, quantity and material of the clamping pieces, its fixing performance in different materials can be further optimized to meet the installation requirements in different scenarios;

[0023] 3. The design of the grid-type expansion bar enables the expansion device of the present invention to maintain the same ease of operation as the traditional expansion bolts during installation, without the need for additional special tools or complicated steps, thus reducing the difficulty and cost of construction.

[0024] 4. When the grid-type expansion strip design is applied to weak walls such as lightweight bricks and aerated bricks, after the screw piece enters, the snap-in pieces will expand outward and eat into the hole wall, playing a role of safe anchoring, thereby improving the pull-out resistance; it is better than the traditional serrated expansion strip, because the serrated type has a card point that is always on a thin line, and it can be pulled out as easily as a saw, while our snap-in pieces are arranged in a surrounding and multi-layer manner. Each snap-in piece can be anchored into or to the anchor hole wall like a hoe, with a wider longitudinal contact surface and better anchoring and snapping effects.

[0025] 5. By setting a bending portion at the end of the expansion bar, the end of the bending portion is tilted outward, so that the expansion bar fits more tightly with the hole wall. When the expansion bar expands outward, the end of the bending portion is squeezed, and has a certain resilience and anti-hook force, which further improves the clamping effect of the expansion device.

[0026] 6. By providing concave and / or convex patterns and / or nail patterns and / or nail puncture patterns on both sides of the expansion strip groove, the friction and clamping force between the expansion strip and the hole wall and the bolt / pin are enhanced, thereby improving the clamping effect.

[0027] 7. It is more effective to plant glue between the sleeve and / or the expansion strip. Through multi-point glue installation, it can ensure that a sufficient amount of glue is applied to the inside of the anchor hole, making the glue filling inside the anchor hole more substantial and full. The glue is fixed under the condition of ideal clamping and expansion effect, so that the anchoring effect is better and the tensile strength value is stronger, especially in weak walls such as aerated bricks and porous sub-bricks.

[0028] 8. A gasket bent inwardly is provided on the left or / and right side of the grille-type expansion bar, and the gasket is bent along the thread direction of the expansion member: when the expansion member enters or passes through the shrinking and expanding device, the gasket is located at the convex or concave part of the thread of the expansion member; when the gasket is located at the concave part of the thread of the expansion member or the concave part of the nail, it forms a snap connection or a screw connection with the expansion member; when the gasket is located at the convex part of the thread of the expansion member or the convex part of the nail, the interaction with the expansion member allows the grille-type expansion bar to expand further, thereby achieving better anchoring and snapping effects.

[0029] 9. The clamping piece is arranged perpendicularly or obliquely to the length direction of the grid-type expansion strip. It should be noted that the vertical or oblique arrangement here does not extend outward from the center of the expansion device, but is arranged vertically or obliquely from the left side to the right side or / and the right side to the left side of the groove of the grid-type expansion strip, which is completely out of the technical scheme of setting outward from the center of the circle, and is not set in the circumferential direction from the center of the circle, which greatly subverts the traditional setting method. The traditional setting of expanding outward from the center of the circle can only improve the pulling force through the friction force of the interference fit. In this scheme, when the expansion piece enters the expansion part, it will cause the grid-type expansion strip to expand, and the grids will eat into the wall or be stuck to the wall hole to improve the pulling force.

[0030] 10. The balancing positioning fulcrum can be used as a screw thread and a card tooth at the same time. The front part of the expansion piece is set as a nail or a barbed nail, and the back part is partially set with a thread. The nail can be driven into the screw point first, and then the screw can be screwed in. It can achieve unified positioning first and then unified tightening, which is convenient for users to operate and saves time for users.

[0031] 11. The card piece is arranged on the side of the convex pattern close to the sleeve. When the expansion strip is subjected to an outward pulling force, the card piece is easily bent in the direction of the convex pattern. At this time, the convex pattern has the effect of blocking the card piece, thereby further improving the pulling effect of the card piece.

[0032] 12. Sealant is provided at the head of the sleeve or inside the head, that is, the end away from the expansion strip. The difference between sealant and ordinary structural adhesive is that sealant does not have an anti-pullout effect, but can seal and isolate the air connection between the inside and outside of the sleeve. Whether the sealant is pre-set or set on site, it is convenient for the expansion parts to enter. Unlike structural adhesive, which is harder than the wall after solidification, it is not convenient for the expansion parts to enter and exit after solidification. In the case where the expansion device is preferably an ordinary metal part, the air can easily flow into the expansion device without the use of sealant, which can easily cause the expansion device to oxidize and rust. At this time, if a sealant is provided, the circulation of air can be isolated or blocked, which has an antioxidant effect. Especially in coastal areas, the air is salty and the temperature is high. If the air circulation is not blocked, it is more likely to cause rust and oxidation. In addition, when the expansion device is used to fix outdoor objects such as street lights and air conditioners, in an environment exposed to wind and rain for a long time, if a sealant is not provided to isolate or block the circulation of air and rain, it is easy to rust and age, which has an antioxidant effect. Therefore, it is preferred to provide a sealant for outdoor use. By isolating or blocking the circulation of air, it has an antioxidant effect and greatly extends the service life of the expansion member. Although the expansion member can be made of stainless steel, the cost is high. In this way, only the part of the expansion member exposed to the outside needs to be made of stainless steel, which saves material costs; the sealant can be pre-designed on the sleeve head or set on-site to facilitate the entry and exit of the expansion member. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is the first viewing angle diagram of this embodiment;

[0034] Figure 2 is a second viewing angle diagram of this embodiment;

[0035] Figure 3 This is a perspective view of the outside of the grille expansion strip;

[0036] Figure 4 This is a perspective view of the inside of the grille expansion bar;

[0037] Figure 5 It is a schematic diagram of a case where a grid-type expansion bar is arranged on the peripheral side wall of a sleeve;

[0038] Figure 6 It is a schematic diagram when a glue attachment device is provided on the expansion device.

[0039] Description of reference numerals:

[0040] 1. Sleeve; 2. Grid-type expansion bar; 3. Groove; 4. Snap-in piece; 5. Bending portion; 6. Convex pattern; 7. Concave pattern; 8. Through hole; 9. Balancing fulcrum; 10. Gasket; 11. Glue attachment device. DETAILED DESCRIPTION

[0041] In order to make the purpose, 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 in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0042] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] An expansion device, such as Figures 1 to 4 As shown, it includes a sleeve 1, on which is provided a shrinking and expanding device, which includes one, two or more expansion strips arranged on the sleeve 1. When the expansion member enters or passes through the shrinking and expanding device, the expansion strips expand outward, so that the expansion strips are engaged with the hole wall to achieve fixation of the expansion device and the hole wall.

[0044] A groove 3 is provided on the outside of the expansion bar, and the groove 3 is extended along the length direction of the expansion bar. Specifically, the two sides of the expansion bar are bent outward, so that a groove 3 is formed in the middle of the expansion bar. One, two or more clamping pieces 4 are provided in the groove 3 of the expansion bar, forming a grid shape in the groove 3, thereby forming a grid-type expansion bar 2, and a number of clamping pieces 4 are arranged in the groove 3 at intervals. When the expansion bolt expands the grid-type expansion bar 2, the clamping piece 4 is clamped with the hole wall, thereby forming a multi-point locking effect, which effectively improves the overall pull-out bearing capacity. When the groove 3 is filled with glue, the clamping piece 4 can play the role of a rubber bar, and the filling glue is not easy to fall off. The filling glue makes the anchor hole wall and the expansion bar more firmly connected, forming a glue-solid whole, and improving the pull-out resistance.

[0045] The clip 4 is perpendicular or inclined to the length direction of the grid-type expansion bar 2. When the clip 4 is perpendicular, it is easier to insert the clip 4 into the hole wall. When the clip 4 is inclined, the clip 4 is preferably inclined toward the sleeve 1, so that the clip 4 has a barb effect and a stronger pulling force. In this embodiment, the clip 4 is perpendicular to the length direction of the grid-type expansion bar 2. The grid formed by the clip 4 and the groove 3 is a square grid, a trapezoidal grid or a polygonal grid. In this embodiment, since the length of the clip 4 gradually increases from the grid-type expansion bar 2 to the sleeve 1, a trapezoidal grid is formed.

[0046] The side walls on both sides or one side of the groove 3 are bent inward to form a snap-in piece 4, and a notch is formed where the side wall forms the snap-in piece 4. The bending degrees between different snap-in pieces 4 can be the same or different. In this embodiment, the bending degrees of all snap-in pieces 4 are the same. The snap-in piece is preferably set as a reverse hook, that is, the bending angle is in the range of 30° to 90°, or so. If it is greater than 90°, when the expansion device is pulled outward, the snap-in piece 4 will follow the pulling direction, so that the pulling force is weakened. If it is less than 30°, the pulling force will also be weakened. It should be noted that this limitation is only a preferred embodiment. If the snap-in piece is set greater than 90 degrees or less than 30 degrees, a corresponding anti-pulling force will also be generated, and it is required to be used in the same way within the pulling force value range.

[0047] When the card connecting piece 4 consists of two or more pieces and is set on one side, it forms a grid shape together with the side wall; when the card connecting piece 4 consists of two or more pieces and is set on both sides, it forms a grid shape together with the side wall, and the two sides of the card connecting piece 4 are set symmetrically or staggered.

[0048] When multiple snap-in plates 4 are arranged on the grid-type expansion bar 2, each grid-type expansion bar 2 generates multiple grids. When the shrinkage and expansion device includes two or more grid-type expansion bars 2 arranged on the sleeve 1, the grids between the two or more grid-type expansion bars 2 are arranged in a surrounding manner. The surrounding arrangement includes: a surrounding spiral arrangement, that is, the snap-in plates 4 between adjacent grid-type expansion bars 2 are gradually raised; a flush surrounding arrangement, that is, the snap-in plates 4 between adjacent grid-type expansion bars 2 are of the same height; a staggered surrounding arrangement, that is, the snap-in plates 4 between adjacent grid-type expansion bars 2 are staggered in height.

[0049] The expansion and contraction device includes one or two or more grid-type expansion bars 2 arranged on the sleeve 1, or the expansion and contraction device includes one or two or more first expansion bars and one or two or more second expansion bars arranged on the sleeve 1, the first expansion bar is a grid-type expansion bar, the second expansion bar is one or more of a strip expansion bar, a serrated expansion bar, a U-shaped expansion bar, a W-shaped expansion bar, an S-shaped expansion bar, a V-shaped expansion bar, and a baffle, and the first expansion bar and the second expansion bar are arranged in combination at intervals. Therefore, when the expansion and contraction device includes general expansion bars, at least one grid-type expansion bar 2 will be arranged. In this embodiment, it is preferred that four grid-type expansion bars 2 are arranged on the sleeve 1, and the four grid-type expansion bars 2 are arranged equidistantly along the circumference of the sleeve 1.

[0050] When the shrinkage and expansion device includes two or more grid-type expansion bars 2 arranged on the sleeve 1, the number of the snap-in plates 4 arranged in the groove 3 of the grid-type expansion bar 2 is different or the same. When the number of the snap-in plates 4 is different, it can be different between each grid-type expansion bar 2, or one or several grid-type expansion bars can be different from the others.

[0051] The grid-type expansion bar 2 is arranged at one end of the sleeve 1 or / and the circumferential side of the sleeve 1, and one end of the grid-type expansion bar 2 is connected to the circumferential side wall of the sleeve 1. That is to say, the grid-type expansion bar 2 can be arranged at the end of the sleeve 1, or on the circumferential side wall of the sleeve 1, or the grid-type expansion bar 2 can be arranged at both the end and the circumferential side wall of the sleeve 1.

[0052] like Figure 5 As shown, when the grid-type expansion bar 2 is arranged on the peripheral side wall of the sleeve 1, the peripheral side wall of the sleeve 1 is provided with a through hole 8, and the grid-type expansion bar 2 is arranged at the through hole 8 so that the expansion member in the sleeve 1 can contact it, and one end of the grid-type expansion bar 2 is connected to the peripheral side wall of the sleeve 1, and the other end is separated so that the other end can be opened outward. When a baffle is arranged on the sleeve 1 or the grid-type expansion bar 2 is arranged on the peripheral side wall of the sleeve 1, only one expansion bar can be arranged, and the baffle or the sleeve fits with the hole wall, and the expansion bar can be opened outward to play a fixing effect. In this embodiment, it is preferred that the format-type expansion bar is arranged at the end of the sleeve 1.

[0053] like Figures 1 to 4 As shown, a bending portion 5 is provided at one end of the grid-type expansion bar 2 away from the connection with the sleeve 1. The bending portion 5 is extended in the direction of the connection between the grid-type expansion bar 2 and the sleeve 1, that is, it is bent back. The bending portion 5 is located outside the grid-type expansion bar 2, that is, it is arranged outside the groove 3. The end of the bending portion 5 is tilted outward or the bending portion 5 is sawtooth-shaped or corrugated. When the bending portion 5 is sawtooth-shaped or corrugated, the end is tilted outward, or the bending portion is directly inclined (tilted in the direction of the sleeve) and arranged upward, or it is sawtooth-shaped or wavy. By setting the bending portion 5, the expansion bar is more closely attached to the hole wall. When the expansion bar expands outward, the end of the bending portion 5 is squeezed and has a certain resilience, which further improves the clamping effect of the expansion device. Or\A bending portion is provided at one end of the grid-type expansion bar away from the connection with the sleeve. The bending portion is located outside the grid-type expansion bar. A clamping piece is provided on the bending portion, that is, the clamping piece is pressed on the bending portion.

[0054] The inner surface or outer surface of the grille-type expansion bar or / and the strip-shaped expansion bar or / and the serrated expansion bar or / and the U-shaped expansion bar or / and the W-shaped expansion bar or / and the S-shaped expansion bar or / and the V-shaped expansion bar or / and the baffle are provided with concave patterns 7 or / and convex patterns 6 or / and nail-hammer patterns or / and nail-puncture patterns. The patterns are arranged on the outer surface, and when the expansion bar fits against the hole wall, the friction with the hole wall can be enhanced. The patterns are arranged on the inner surface, and the friction, the clamping force, and the concave-convex combination effect with the expansion member (bolt / pin) can be enhanced, thereby improving the clamping effect.

[0055] The clamping piece is located on the side of the concave pattern 7 and / or the convex pattern 6 and / or the nail pattern and / or the nail pattern close to the sleeve (refer to Figure 1The second set of card plates in the expansion device), when the expansion device is pulled outward, the card plates are easily deformed in the direction away from the sleeve. At this time, the card plates will be blocked by the convex pattern or affected by the friction effect, making it difficult for the card plates to continue to deform, further improving the pulling effect of the card plates.

[0056] The outer surface of the strip expansion strip, the sawtooth expansion strip, the U-shaped expansion strip, the W-shaped expansion strip, the S-shaped expansion strip, the V-shaped expansion strip, and the baffle is provided with a filler, and the filler includes one or more of metal material, plastic material, wood and bamboo material, nylon material, chemical hose, carbonized wood and bamboo, and fiber. The filler can be flexibly selected according to the needs to meet different requirements on strength, corrosion resistance, elasticity, deformability, etc.

[0057] Glue is provided inside the sleeve 1, or / and when two or more grid-type expansion bars 2 are provided on the sleeve 1, glue is provided between the grid-type expansion bars 2 or / and glue is provided inside the grid. That is, filling glue is implanted between the sleeve 1 and the grid-type expansion bar 2. When the spiral or pin enters the sleeve 1, the filling glue is squeezed outward, so that the hole wall is fuller, the pulling force is stronger, and the connection is more secure. Or glue is provided inside the grid formed by the groove 3 and the clamping piece 4. Glue is provided between the grid-type expansion bars 2 or / and glue is provided inside the grid, and installed into the corresponding anchor hole. When the expansion member enters the sleeve 1 by screwing in or knocking until the expansion part, that is, the grid-type expansion bar, the glue squeezed inside the grid-type expansion bar is merged with the glue provided on the grid. At the same time, the overflowing glue is connected to the anchor hole wall, and after solidification, it forms a whole to improve the pulling force and achieve a more ideal anchoring effect. It should be noted that the purpose of setting glue inside the sleeve, between the grille-type expansion bars, and inside the grille is to allow the glue in the anchor hole to reach a preset saturation, thereby achieving a gluing effect. Therefore, different gluing methods can be selected according to the expected glue saturation to achieve the corresponding gluing effect.

[0058] The peripheral wall of the sleeve 1 is provided with a through hole 8 at the location where the grid-type expansion bar 2 is set, or / and the peripheral wall of the sleeve 1 is provided with a through hole, and glue is planted into the sleeve 1 through the through hole. That is, when the grid-type expansion bar 2 is set on the peripheral wall of the sleeve 1, a through hole 8 is opened on the peripheral wall of the sleeve 1, and the grid-type expansion bar 2 is set at the through hole 8, and glue is planted into the sleeve 1 from the gap between the edge of the grid-type expansion bar 2 and the through hole 8. When the peripheral wall of the sleeve 1 is not provided with a grid-type expansion bar 2, a through hole for planting glue is specially reserved on the peripheral wall of the sleeve 1. After the glue is planted in the sleeve and installed in the corresponding anchor hole, when the expansion member enters the sleeve 1 by screwing in or knocking, the adhesive tape set in the sleeve can be moved to the expansion part, and at the same time, the glue will overflow into the gap of the expansion bar to connect with the anchor hole wall, and solidify into a whole to increase the pulling force, so as to achieve a more ideal anchoring effect.

[0059] The head of the sleeve 1 or the end inside the head, i.e., the end away from the expansion strip, is provided with a sealant. The difference between the sealant and the common structural adhesive is that the sealant does not have an anti-pullout effect, but can isolate the air connection between the sleeve 1 and the outside. When the expansion device is preferably a common metal part, the air can easily flow into the expansion device without the use of sealant, which can easily cause the expansion device to oxidize and rust. At this time, if a sealant is provided, the circulation of air can be isolated or hindered, thus achieving an anti-oxidation effect. Although the expansion member can be made of stainless steel, the cost is high. In this case, only the part of the expansion member exposed to the outside needs to be made of stainless steel, thus saving material costs. The sealant can be pre-designed on the sleeve head or set on site to facilitate the entry and exit of the expansion member. The expansion member is provided with an anti-oxidation coating and / or directly made of stainless steel.

[0060] The expansion member enters the sleeve 1 by screwing or knocking, and the sleeve 1 is provided with corresponding screw threads or clamping teeth for the expansion member to enter and exit. One end of the combination of the expansion member and the expansion device is a spiral or / and a nail or / and a barbed nail, and the other end is a bolt, a screw, a pointed nail, a sheep's head nail, a hook nail, a ball joint, a clamp, a positioning nail, a four-corner pressure nail, and a pipe clamp. The other end can protrude from the wall for use, and the shape of the other end of the expansion member can be flexibly selected according to the needs of the use scenario.

[0061] The head end of the sleeve is provided with a balancing and positioning fulcrum or / and a screw thread or / and a clamping tooth of the expansion member. In this embodiment, the head end of the sleeve 1 is provided with a balancing and positioning fulcrum 9 of the expansion member. The balancing and positioning fulcrum 9 can be used as a screw thread or / and a clamping tooth. When the balancing and positioning fulcrum 9 is used as both a screw thread and a clamping tooth, it is because the front part of the expansion member is set as a nail or a nail with thorns, and the back part is partially provided with a thread. When the nail is driven into the screw point and it is difficult to enter, it is screwed in. The balancing and positioning fulcrum 9 can be a rack-like structure formed by punching the side wall of the sleeve 1 inwardly or / and a folding and clamping point punched at the sleeve mouth. Preferably, three rack-like structures or / and three folding and clamping points punched at the sleeve mouth are equidistantly arranged on the side wall of the sleeve 1 in the circumferential direction. When the expansion member enters the head end of the sleeve 1, it is threadedly matched with the balancing and positioning fulcrum 9, so that the expansion member can remain parallel to the sleeve 1, avoiding the expansion member from being skewed, especially under the hanging force, it is easier to be skewed, so it is urgent to set the balancing and clamping fixed position 9.

[0062] The left and / or right sides of the grid type expansion bar 2 are provided with a gasket 10 bent inwardly, and the gasket 10 is provided with one or two or more pieces. When the expansion member enters or passes through the shrinking device, the gasket 10 is located at the protrusion or concave part of the expansion member thread or nail.

[0063] When the gasket 10 is located at the concave part of the expansion member thread, that is, the gasket 10 cooperates with the expansion member thread, the gasket 10 plays the role of the internal thread, making the expansion member and the expansion device more firmly connected. When the gasket 10 is located at the convex part of the expansion member thread, it is equivalent to thickening the inner side of the grid-type expansion bar 2, so that the expansion member can open the grid-type expansion bar 2 outward more, and improve the connection strength with the hole wall.

[0064] The gasket 10 can be arranged only on the left or right side of the grid-type expansion strip 2. The gasket 10 is tightly attached to the grid-type expansion strip 2 or / and the inner surface of the general expansion strip as a whole or integrated or flush or with a reserved gap. The gasket 10 is bent along the thread direction of the expansion piece so that the expansion piece will not be stuck by the gasket 10 when it is screwed in. It should be noted that the screw thread of the expansion piece can be provided with a notch. Because the notch is provided on the screw thread, when the gasket 10 is screwed in, if it is not connected to the spiral direction, its notch will be stuck at the tail end of the gasket 10, affecting the screwing process of the expansion piece. Therefore, the preferred gasket 10 is bent along the thread direction of the expansion piece, which is more convenient for the expansion piece to enter. Since the notch is provided on the screw thread of the expansion piece, the notch is an obstacle point when it is withdrawn, which has a certain anti-loosening and anti-falling effect.

[0065] like Figure 6 As shown, the tail end of the expansion device can also be provided with a glue attachment device 11 with glue, so that the glue in the glue attachment device 11 is squeezed out when the expansion piece is screwed in. The glue attachment device 11 is made of metal, nylon or plastic material, and can be in the form of a spring, a strip, a hollow tube, etc. Alternatively, the glue attachment device 11 is not provided at the tail end of the expansion device, and the expansion device is used in conjunction with a chemical hose. In this embodiment, a spring-shaped glue attachment device 11 is used, that is, the spring is sleeved on the expansion device, and the spring has elasticity. When the expansion piece enters the expansion device, the spring can expand outward. It should be noted that the glue attachment device must first be able to attach glue, and the design purpose is to attach as much glue as possible in the same space and volume. Second, this glue attachment device must be able to compress and deform under the pressure of force to make the glue overflow to the surroundings and flow back, so that the expansion device not only has an expansion force, but also has a glue-fixing effect, and finally achieves a better anchoring effect.

[0066] It should be noted that the shape of the sleeve 1, that is, the cross section can be circular, polygonal, plum blossom, or wavy, which does not affect the setting of the grid-type expansion strips, and can facilitate the entry and exit of the expansion piece.

[0067] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the design concept of the present invention should be included in the protection scope of the present invention.

Claims

1. An expansion device, comprising a sleeve, wherein the sleeve is provided with an expansion device, wherein the expansion device comprises one, two or more expansion strips arranged on the sleeve, and when the expansion member enters or passes through the expansion device, the expansion strips expand outwards, characterized in that: A groove is arranged on the outside of the expansion bar, and the groove extends along the length direction of the expansion bar. One, two or more clamping pieces are arranged on the groove of the expansion bar to form a grid-type expansion bar, and a plurality of the clamping pieces are arranged on the groove at intervals.

2. An expansion device according to claim 1, characterized in that: The clamping piece is arranged perpendicularly or obliquely to the length direction of the grid-type expansion bar.

3. An expansion device according to claim 1, characterized in that: The side walls on both sides or one side of the groove are bent inward to form snap-in pieces, and the bending degrees of the snap-in pieces are the same or different. When the snap-in pieces are two or more and are set on one side, they are combined with the side walls to form a grid shape; when the snap-in pieces are two or more and are set on both sides, they are combined with the side walls to form a grid shape, and the two sides of the snap-in pieces are set symmetrically or staggered.

4. An expansion device according to claim 1, characterized in that: The expansion and contraction device includes one, two or more grid-type expansion bars arranged on the sleeve, or the expansion and contraction device includes one, two or more first expansion bars and one, two or more second expansion bars arranged on the sleeve, the first expansion bar is the grid-type expansion bar, the second expansion bar is one or more of a strip expansion bar, a serrated expansion bar, a U-shaped expansion bar, a W-shaped expansion bar, an S-shaped expansion bar, a V-shaped expansion bar, and a baffle, and the first expansion bar and the second expansion bar are arranged in combination and at intervals.

5. An expansion device according to claim 1, characterized in that: When the shrinkage and expansion device includes two or more grid-type expansion bars arranged on the sleeve, the number of the clamping pieces of the grid-type expansion bars is different or the same, and the grid formed by the clamping pieces and the grooves is a square grid, a trapezoidal grid or a polygonal grid.

6. An expansion device according to claim 1, characterized in that: When multiple snap-in plates are provided on the grid-type expansion bar, each of the grid-type expansion bar generates multiple grids. When the shrinkage and expansion device includes two or more of the grid-type expansion bars provided on the sleeve, the grids between the two or more of the grid-type expansion bars are arranged in a surrounding manner. The surrounding arrangement includes: any one of a surrounding spiral arrangement, a flush surrounding arrangement, and a staggered surrounding arrangement.

7. An expansion device according to claim 1, characterized in that: The grid-type expansion bar is arranged at one end of the sleeve or / and a grid-type expansion bar is arranged on the peripheral side of the sleeve, and one end of the grid-type expansion bar is connected to the peripheral side wall of the sleeve.

8. An expansion device according to claim 1, characterized in that: The end of the grid-type expansion bar away from the sleeve connection is provided with a bending portion, the bending portion is located outside the grid-type expansion bar, the end of the bending portion is tilted outward, or the bending portion is sawtooth or corrugated and the end is tilted outward, or the bending portion is directly tilted upward or is sawtooth or corrugated; or\a bent portion is provided at one end connected to the grid-type expansion bar away from the sleeve, the bent portion is located outside the grid-type expansion bar, and a clamping piece is provided on the bent portion; The sleeve is in a circular, polygonal, plum blossom or wavy shape.

9. An expansion device according to claim 1, characterized in that: The inner surface or outer surface of the grille-type expansion bar or / and strip-shaped expansion bar or / and sawtooth-type expansion bar or / and U-shaped expansion bar or / and W-shaped expansion bar or / and S-shaped expansion bar or / and V-shaped expansion bar or / and baffle is provided with concave patterns or / and convex patterns or / and nail patterns or / and nail puncture patterns; or, the outer surface of the grille-type expansion bar or / and strip-shaped expansion bar or / and sawtooth-type expansion bar or / and U-shaped expansion bar or / and W-shaped expansion bar or / and S-shaped expansion bar or / and V-shaped expansion bar or / and baffle is provided with fillers, and the fillers include one or more of metal materials, plastic materials, wood and bamboo materials, nylon materials, chemical hoses, carbonized wood and bamboo, and fibers; The clamping piece is arranged on a side of the concave pattern and / or the convex pattern and / or the nail-hammer pattern and / or the nail-piercing pattern close to the sleeve.

10. An expansion device according to claim 1, characterized in that: Glue is arranged inside the sleeve, or / and when two or more grille-type expansion bars are arranged on the sleeve, glue is arranged between the grille-type expansion bars or / and glue is arranged inside the grille; or, a through hole is reserved on the peripheral side wall of the sleeve and located at the setting position of the grille-type expansion bar or / and a through hole is opened on the peripheral side wall of the sleeve, and glue is planted into the sleeve through the through hole; or / and a sealant is arranged on the head of the sleeve; the expansion member is provided with an anti-oxidation coating or / and stainless steel material is directly used.

11. An expansion device according to claim 1, characterized in that: The sleeve is provided with screw threads or clamping teeth for the expansion member to enter and exit, one end of the combination of the expansion member and the expansion device is a spiral or / and a nail or / and a nail with thorns, and the other end is a bolt, a screw, a pointed nail, a sheep's head nail, a hook nail, a ball joint, a clamp, a positioning nail, a four-corner pressure nail, and a pipe clamp; The sleeve head end is provided with a balancing and positioning fulcrum and / or a screw thread and / or a locking tooth of the expansion member, or the sleeve head end is provided with a balancing and positioning fulcrum of the expansion member, and the balancing and positioning fulcrum can be used as a screw thread and / or a locking tooth.

12. An expansion device according to claim 1, characterized in that: The left side and / or the right side of the grid-type expansion bar is provided with a gasket bent inwardly, and the gasket is provided with one or two or more gaskets.

13. An expansion device according to claim 12, characterized in that: The gasket is arranged on the left or right side of the grid-type expansion bar. The gasket is tightly attached to the inner surface of the grid-type expansion bar or integrated into one body or flush with the inner surface of the grid-type expansion bar or with a reserved gap. The gasket is bent along the thread direction of the expansion member. When the expansion member enters or passes through the shrinking device, the gasket is located at the protrusion or recess of the thread of the expansion member.

14. An expansion device according to claim 1, characterized in that: The tail end of the expansion device is provided with an adhesive attachment device for carrying adhesive, and the adhesive attachment device is made of metal, nylon or plastic, or the expansion device is used in conjunction with a chemical hose.

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