Expansion device

Abstract

According to the technical scheme, the expansion device is characterized in that the expansion device comprises 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] This utility model relates to the field of expansion bolt technology, and more specifically to an expansion device. Background Technology

[0002] In the construction and engineering fields, expansion bolts are a commonly used fastener, widely applied in various situations requiring the fixing or connection of structures. The working principle of expansion bolts mainly relies on their expansion device. As the expanding element, such as a bolt or pin, enters the expansion device, the expansion device expands outward, creating a tight mechanical engagement with the wall of the mounting hole, thereby achieving a firm fixing effect.

[0003] Traditional expansion devices mostly adopt a simple unidirectional 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 shank enters, the expansion bar expands outward along the radial direction of the bolt, relying on the friction between the expansion bar and the wall of the hole to provide the necessary pull-out force.

[0004] However, this simple unidirectional expansion bar structure mainly provides expansion force in one direction, and its expansion capacity in other directions is weak. In particular, it may not be able to meet the high requirements for pull-out force in some applications, especially when it needs to withstand large loads or vibration loads. Traditional expansion devices are prone to loosening or falling off. Utility Model Content

[0005] To solve the above problems, this utility model provides the following technical solution:

[0006] An expansion device includes a sleeve with a shrink-expansion mechanism. The shrink-expansion mechanism includes one, two, or more expansion strips disposed on the sleeve. When an expansion element enters or passes through the shrink-expansion mechanism, the expansion strips expand outward. A groove is provided on the outer side of the expansion strip, extending along the length direction of the expansion strip. One, two, or more snap-fit ​​pieces are disposed on the groove of the expansion strip, thereby forming a grid-like expansion strip. A plurality of snap-fit ​​pieces are spaced apart on the groove. The snap-fit ​​pieces are perpendicular or inclined to the length direction of the grid-like expansion strip.

[0007] The present invention is further configured such that: the sidewalls on both sides or one side of the groove are bent inward to form snap-fit ​​pieces, the bending degrees of the snap-fit ​​pieces are the same or different, when there are two or more snap-fit ​​pieces and they are set on one side, they are combined with the sidewall to form a grid shape; when there are two or more snap-fit ​​pieces and they are set on both sides, they are combined with the sidewall to form a grid shape, and the two sides of the snap-fit ​​pieces are set symmetrically or staggered.

[0008] The present invention is further configured such that: the expansion and contraction device includes one or two or more grid-type expansion bars disposed on the sleeve, or the expansion and contraction device includes one or two or more first expansion bars and one or two or more second expansion bars disposed on the sleeve, wherein the first expansion bar is the grid-type expansion bar, and the second expansion bar is one or more of the following: strip expansion bar, serrated expansion bar, U-shaped expansion bar, W-shaped expansion bar, S-shaped expansion bar, V-shaped expansion bar, baffle, and the first expansion bar and the second expansion bar are arranged in a spaced-apart combination.

[0009] The present invention is further configured such that: when the expansion and contraction device includes two or more grid-type expansion bars disposed on the sleeve, the number of snap-fit ​​pieces disposed on the grid-type expansion bars is different or the same, and the grid formed by the snap-fit ​​pieces and the groove is a square grid, a trapezoidal grid, or a polygonal grid.

[0010] The present invention is further configured such that: when the grid-type expansion bar is provided with multiple snap-fit ​​pieces, each grid-type expansion bar generates multiple grids; when the expansion and contraction device includes two or more grid-type expansion bars provided on the sleeve, the grids between the two or more grid-type expansion bars are arranged in a ring-like manner, and the ring-like arrangement includes any one of the following: a ring-like spiral arrangement, a flush ring-like arrangement, and a staggered ring-like arrangement.

[0011] The present invention is further configured such that: the grid-type expansion bar is provided at one end of the sleeve or / and the circumference of the sleeve is provided with a grid-type expansion bar, and one end of the grid-type expansion bar is connected to the circumference wall of the sleeve.

[0012] The present invention is further configured such that: the end of the grid-type expansion bar away from the sleeve connection has a bent portion, the bent portion is located outside the grid-type expansion bar, the end of the bent portion curves outward, or the bent portion is serrated or corrugated and the end curves outward, or the bent portion is directly inclined upward or is serrated or corrugated; or the end of the grid-type expansion bar away from the sleeve connection has a bent portion, the bent portion is located outside the grid-type expansion bar, and a snap-fit ​​piece is provided on the bent portion; the sleeve is circular, polygonal, plum blossom-shaped, or wavy.

[0013] The present invention is further configured such that: the inner and outer surfaces of the grid-type expansion strip and / or strip-shaped expansion strip and / or serrated expansion strip and / or U-shaped expansion strip and / or W-shaped expansion strip and / or S-shaped expansion strip and / or V-shaped expansion strip and / or baffle are provided with concave and / or convex and / or nail-punched and / or nail-pierced patterns; or, the outer surface of the grid-type expansion strip and / or strip-shaped expansion strip and / or serrated expansion strip and / or U-shaped expansion strip and / or W-shaped expansion strip and / or S-shaped expansion strip and / or V-shaped expansion strip and / or baffle is provided with a filler, the filler including one or more of metal materials, plastic materials, wood and bamboo materials, nylon materials, chemical adhesive tubes, carbonized wood and bamboo, and fibers; the snap-fit ​​piece is disposed on the side of the concave and / or convex and / or nail-punched and / or nail-pierced patterns near the sleeve.

[0014] The present invention is further configured such that: the sleeve is provided with adhesive inside, or / and when the sleeve is provided with two or more grid-type expansion strips, adhesive is provided between the grid-type expansion strips or / and adhesive is provided inside the grid; or, the peripheral sidewall of the sleeve and the location of the grid-type expansion strips are provided with through holes or / and the peripheral sidewall of the sleeve is provided with through holes, and adhesive is applied into the sleeve through the through holes; or / and the sleeve head is provided with sealant; the expansion element is provided with an anti-oxidation coating or / and is made of stainless steel.

[0015] The present invention is further configured such that: the sleeve is provided with threads or clamps for the expansion element to enter and exit; one end of the expansion element combined with the expansion device is a helix and / or a nail and / or a barbed nail, and the other end is one of a bolt, screw, pointed nail, ram's head nail, hook nail, ball joint, clamp, positioning nail, four-corner press nail, or pipe clamp; the sleeve head end is provided with a balance positioning fulcrum for the expansion element and / or threads and / or clamps, or the sleeve head end is provided with a balance positioning fulcrum for the expansion element, and the balance positioning fulcrum can be used as threads and / or clamps.

[0016] The present invention is further configured such that: the left and / or right sides of the grid-type expansion bar are provided with a gasket bent inward, and the gasket is provided with one, two or more pieces.

[0017] The present invention is further configured such that: the gasket is disposed 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 is integrated with it, or is flush with it, or is disposed 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 expansion device, the gasket is located at the protrusion or concave part of the thread of the expansion member.

[0018] The present invention is further configured such that: the tail end of the expansion device is provided with an adhesive applicator for applying adhesive, the adhesive applicator being made of metal, nylon, or plastic, or the expansion device being used in conjunction with a chemical adhesive tube.

[0019] Compared with the prior art, the present invention has at least the following advantages:

[0020] 1. By setting snap-fit ​​pieces on the expansion strip to form a grid-type expansion strip, the snap-fit ​​pieces lock the expansion bolts at multiple points with the hole wall when the expansion strip expands, 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 loads, vibration or dynamic loads, reducing the risk of loosening.

[0021] 2. The design of the grid-type expansion strip is suitable for a variety of wall materials, including but not limited to concrete, brick walls and lightweight panels. By adjusting the shape, number and material of the snap-fit ​​pieces, its fixing performance in different materials can be further optimized to meet the installation needs in different scenarios.

[0022] 3. Furthermore, the design of the grid-type expansion bar ensures that the expansion device of this utility model maintains the same ease of operation as traditional expansion bolts during installation, without the need for additional special tools or complicated steps, thus reducing construction difficulty and cost.

[0023] 4. When the grid-type expansion strip design is applied to weak walls such as lightweight bricks and aerated bricks, after the screw is inserted, the interlocking pieces will expand outward and bite into the hole wall, playing a safe anchoring role, thereby improving the pull-out resistance. It is more effective than the traditional sawtooth expansion strip because the sawtooth type's locking point is always on a thin line, and it is easy to be pulled out like a saw. Our interlocking pieces are set in a ring and multi-layered manner. Each interlocking piece can anchor into or anchor to the anchor hole wall like a hoe, with a wider longitudinal contact surface and better anchoring and locking effect.

[0024] 5. By setting a bend at the end of the expansion bar, the end of the bend bends outward, making the expansion bar fit more tightly with the hole wall. When the expansion bar expands outward, the end of the bend is squeezed, which has a certain elastic force and anti-hooking force, further improving the locking effect of the expansion device.

[0025] 6. By setting concave and / or convex and / or nail-punch and / or nail-bark 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 locking effect.

[0026] 7. Applying adhesive between the sleeve and / or expansion strip will yield better results. By applying adhesive at multiple points, it can ensure that a sufficient amount of adhesive is delivered into the anchor hole, making the adhesive filling inside the anchor hole more complete and full. The adhesive will be applied under ideal conditions of locking and expansion, resulting in better anchoring effect and stronger pull-out strength, especially in weak walls such as aerated concrete blocks and porous bricks.

[0027] 8. By providing inwardly bent gaskets on the left and / or right sides of the grid-type expansion bar, the gaskets are bent along the thread direction of the expansion member: when the expansion member enters or passes through the expansion device, the gaskets are located at the convex or concave part of the expansion member's thread; when the gaskets are located at the concave part of the expansion member's thread or the concave part of the nail, they form a snap-fit ​​or screw-fit relationship with the expansion member; when the gaskets are located at the convex part of the expansion member's thread or the convex part of the nail, the interaction with the expansion member causes the grid-type expansion bar to expand further, thereby achieving a better anchoring and locking effect.

[0028] 9. The snap-fit ​​piece is perpendicular or inclined to the length direction of the grid-type expansion strip. It should be noted that this perpendicular or inclined arrangement does not extend outward from the center of the expansion device, but rather is perpendicular or inclined from the left side of the groove of the grid-type expansion strip to the right and / or from the right side to the left. This completely departs from the technical solution of setting outward from the center of a circle, and is not an outward circumferential arrangement from the center of a circle. This significantly overturns the traditional method, where the traditional outward expansion arrangement can only improve the pull-out force through the friction of the interference fit. In this solution, when the expansion component enters the expansion section, it causes the grid-type expansion strip to expand, with each grid line biting into the wall or snapping into the wall hole to increase the pull-out force.

[0029] 10. The balance positioning fulcrum can be used as both a screw thread and a chuck thread, so that the front part of the expansion part is set as a nail or a barbed nail, and the rear part is partially threaded. The nail can be driven into the screw point first, and then screwed in. This can achieve unified positioning and unified tightening, which is convenient for users and saves them time.

[0030] 11. Position the snap-fit ​​tab on the side of the ridge near the sleeve. When the expansion strip is pulled outward, the snap-fit ​​tab will easily bend towards the ridge. At this time, the ridge will block the snap-fit ​​tab, thereby further improving the pull-out effect of the snap-fit ​​tab.

[0031] 12. The head or the end of the sleeve furthest from the expansion strip is provided with sealant. The sealant is different from ordinary structural adhesive in that it does not have a pull-out resistance effect, but can seal and isolate the air connection between the inside and outside of the sleeve. Whether the sealant is pre-installed or installed on site, it is convenient for the expansion component to enter. Unlike structural adhesive, which becomes harder than the wall after curing and is not convenient for the expansion component to enter or exit after curing. When the expansion device is preferably made of ordinary metal, without sealant, air can easily seep in, causing oxidation and rust. Sealant, by isolating or hindering airflow, provides an anti-oxidation effect, especially in coastal areas where the air is salty and hot. Without sealant, rust and oxidation are more likely to occur. Furthermore, when the expansion device is used on outdoor objects such as fixed streetlights and air conditioners, exposed to wind and rain for extended periods, the lack of sealant to isolate or hinder air and rainwater flow will easily lead to rust and aging, thus providing an anti-oxidation effect. Therefore, for outdoor use, sealant is preferred. By isolating or hindering airflow, it provides an anti-oxidation effect, significantly extending the service life of the expansion component. Although stainless steel can be used for the expansion component, the cost is high. Therefore, only the exposed part of the expansion component needs to be made of stainless steel, saving material costs. The sealant can be pre-designed into the sleeve head or installed on-site for easy access of the expansion component. Attached Figure Description

[0032] Figure 1 This is the first perspective view of this embodiment;

[0033] Figure 2 This is the second perspective view of this embodiment;

[0034] Figure 3 This is a view of the outer side of the grille-type expansion bar;

[0035] Figure 4 This is a view of the inside of the grille-type expansion bars;

[0036] Figure 5 This is a schematic diagram of a grid-type expansion bar installed on the circumferential side wall of the sleeve;

[0037] Figure 6 This is a schematic diagram of an expansion device equipped with an adhesive applicator.

[0038] Explanation of reference numerals in the attached figures:

[0039] 1. Sleeve; 2. Grille-type expansion bar; 3. Groove; 4. Snap-fit ​​piece; 5. Bending part; 6. Raised pattern; 7. Concave pattern; 8. Through hole; 9. Balance fulcrum; 10. Gasket; 11. Adhesive application device. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0041] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0042] An expansion device, such as Figures 1 to 4 As shown, it includes a sleeve 1, which is provided with a shrinking and expanding device. The shrinking and expanding device includes one, two or more expanding strips disposed on the sleeve 1. When the expanding element enters or passes through the shrinking and expanding device, the expanding strip expands outward, so that the expanding strip engages with the hole wall to fix the expanding device to the hole wall.

[0043] The expansion bar has a groove 3 on its outer side, extending along its length. Specifically, the two sides of the expansion bar bend outwards, forming a groove 3 in the middle. One, two, or more snap-fit ​​pieces 4 are placed within the groove 3, forming a grid-like structure, thus creating a grid-type expansion bar 2. Several snap-fit ​​pieces 4 are spaced apart within the groove 3. When the expansion bolt expands with the grid-type expansion bar 2, the snap-fit ​​pieces 4 engage with the hole wall, creating a multi-point locking effect and effectively improving the overall pull-out load-bearing capacity. When the groove 3 is filled with adhesive, the snap-fit ​​pieces 4 act as adhesive reinforcement, preventing the adhesive from falling off. The adhesive further strengthens the bond between the anchor hole wall and the expansion bar, forming a bonded whole and improving pull-out resistance.

[0044] The snap-fit ​​piece 4 is positioned perpendicular to or inclined to the length direction of the grid-type expansion strip 2. When the snap-fit ​​piece 4 is positioned perpendicularly, it is easier for it to snap into the hole wall. When the snap-fit ​​piece 4 is inclined, it is preferable for it to be inclined toward the sleeve 1, giving it a barbed effect and stronger pulling force. In this embodiment, the snap-fit ​​piece 4 is specifically perpendicular to the length direction of the grid-type expansion strip 2. The grid formed by the snap-fit ​​piece 4 and the groove 3 is a square, trapezoidal, or polygonal grid. In this embodiment, since the length of the snap-fit ​​piece 4 gradually increases from the grid-type expansion strip 2 toward the sleeve 1, a trapezoidal grid is formed.

[0045] The retaining tabs 4 are formed by bending inward on both sides or one side wall of the groove 3. A notch is formed where the retaining tab 4 is formed on the side wall. The bending angles of different retaining tabs 4 can be the same or different. In this embodiment, all retaining tabs 4 have the same bending angle. Preferably, the retaining tabs are set with a reverse hook, that is, the bending angle is in the range of 30° to 90°. If it is greater than 90°, when the expansion device is pulled outward, the retaining tab 4 will be in the direction of pull-out, thus weakening the pull-out force. If it is less than 30°, the pull-out force will also be weakened. It should be noted that this limitation is only a preferred embodiment. If the retaining tab is set to a value greater than 90° or less than 30°, a corresponding pull-out force will also be generated. It is required that the same use be made within the range of pull-out force value.

[0046] When there are two or more snap-fit ​​pieces 4 and they are set on one side, they combine with the side wall to form a grid pattern; when there are two or more snap-fit ​​pieces 4 and they are set on both sides, they combine with the side wall to form a grid pattern, and the snap-fit ​​pieces 4 are set symmetrically or staggered on both sides.

[0047] When multiple snap-fit ​​pieces 4 are provided on the grid-type expansion bar 2, each grid-type expansion bar 2 generates multiple grids. When the expansion and contraction device includes two or more grid-type expansion bars 2 provided on the sleeve 1, the grids between the two or more grid-type expansion bars 2 are arranged in a ring. The ring arrangement includes: a ring spiral arrangement, that is, the snap-fit ​​pieces 4 between adjacent grid-type expansion bars 2 gradually rise; a flush ring arrangement, that is, the snap-fit ​​pieces 4 between adjacent grid-type expansion bars 2 have the same height; and a staggered ring arrangement, that is, the snap-fit ​​pieces 4 between adjacent grid-type expansion bars 2 are staggered in height.

[0048] The expansion and contraction device includes one, two, or more grid-type expansion bars 2 disposed on the sleeve 1, or the expansion and contraction device includes one, two, or more first expansion bars and one, two, or more second expansion bars disposed on the sleeve 1. The first expansion bar is a grid-type expansion bar, and the second expansion bar is one or more of the following: strip-shaped expansion bar, serrated expansion bar, U-shaped expansion bar, W-shaped expansion bar, S-shaped expansion bar, V-shaped expansion bar, and baffle. The first expansion bar and the second expansion bar are arranged in a combination with intervals. Therefore, when the expansion and contraction device includes ordinary expansion bars, at least one grid-type expansion bar 2 will be provided. In this embodiment, it is preferable to provide four grid-type expansion bars 2 on the sleeve 1. The four grid-type expansion bars 2 are arranged at equal intervals along the circumference of the sleeve 1.

[0049] When the expansion device includes two or more grid-type expansion bars 2 set on the sleeve 1, the number of snap-fit ​​pieces 4 in the groove 3 of the grid-type expansion bar 2 may be different or the same. When the number of snap-fit ​​pieces 4 is different, each grid-type expansion bar 2 may be different, or one or more grid-type expansion bars may be different from the others.

[0050] A grid-type expansion bar 2 is provided at one end of the sleeve 1 and / or on the periphery of the sleeve 1, with one end of the grid-type expansion bar 2 connected to the periphery wall of the sleeve 1. That is to say, the grid-type expansion bar 2 can be provided at the end of the sleeve 1, or on the periphery wall of the sleeve 1, or both at the end and on the periphery wall of the sleeve 1.

[0051] like Figure 5 As shown, when the grid-type expansion strip 2 is installed on the peripheral sidewall of the sleeve 1, a through hole 8 is provided on the peripheral sidewall of the sleeve 1. The grid-type expansion strip 2 is installed at the through hole 8, so that the expansion element inside the sleeve 1 can contact it. One end of the grid-type expansion strip 2 is connected to the peripheral sidewall of the sleeve 1, and the other end is separated, so that the other end can open outward. When a baffle is provided on the sleeve 1 or the grid-type expansion strip 2 is installed on the peripheral sidewall of the sleeve 1, only one expansion strip can be provided. The baffle or sleeve fits against the hole wall, and the outward opening of the expansion strip can also achieve a fixing effect. In this embodiment, the grid-type expansion strip is preferably installed at the end of the sleeve 1.

[0052] like Figures 1 to 4 As shown, the end of the grid-type expansion bar 2 away from the sleeve 1 has a bent portion 5. The bent portion 5 extends towards the connection between the grid-type expansion bar 2 and the sleeve 1, i.e., it bends back. The bent portion 5 is located outside the grid-type expansion bar 2, i.e., outside the groove 3. The end of the bent portion 5 is raised outward, or the bent portion 5 is serrated or corrugated. When the bent portion 5 is serrated or corrugated, the end is raised outward. Alternatively, the bent portion is directly inclined (inclined towards the sleeve) upward, or it is serrated or corrugated. By setting the bent portion 5, the expansion bar fits more tightly with the hole wall. When the expansion bar expands outward, the end of the bent portion 5 is squeezed and has a certain elastic force, further improving the locking effect of the expansion device. Alternatively, the end of the grid-type expansion bar away from the sleeve has a bent portion, which is located outside the grid-type expansion bar. A snap-fit ​​piece is provided on the bent portion, i.e., the snap-fit ​​piece presses on the bent portion.

[0053] The inner and outer surfaces of the grid-type expansion strip, / and strip-shaped expansion strip, / and serrated expansion strip, / and U-shaped expansion strip, / and W-shaped expansion strip, / and S-shaped expansion strip, / and V-shaped expansion strip, / and baffle are all provided with concave texture 7 and / or convex texture 6 and / or nail hammer texture and / or nail barb texture. The texture on the outer surface can enhance the friction with the hole wall when the expansion strip is in contact with the hole wall. The texture on the inner surface can enhance the friction, locking force, and concave-convex combination effect with the expansion component (bolt / pin), thereby improving the locking effect.

[0054] The snap-fit ​​tab is located on the side of the sleeve with concave groove 7 and / or convex groove 6 and / or nail-punched groove and / or barbed groove (reference). Figure 1The second set of snap-fit ​​pieces (in the sleeve) are designed so that when the expansion device pulls outward, the snap-fit ​​pieces are easily deformed away from the sleeve. At this time, the snap-fit ​​pieces will be blocked by the ridges or subjected to friction, making it difficult for the snap-fit ​​pieces to continue to deform, which further improves the pulling effect of the snap-fit ​​pieces.

[0055] The outer surface of the expansion joint or / and strip-shaped expansion joint or / and serrated expansion joint or / and U-shaped expansion joint or / and W-shaped expansion joint or / and S-shaped expansion joint or / and V-shaped expansion joint or / and baffle is provided with filler material, which includes one or more of the following materials: metal, plastic, wood and bamboo, nylon, chemical rubber tubing, carbonized wood and bamboo, and fiber. The filler material can be flexibly selected according to needs to meet different requirements in terms of strength, corrosion resistance, elasticity, deformability, etc.

[0056] The sleeve 1 is filled with adhesive, or / and when the sleeve 1 has two or more grid-type expansion strips 2, adhesive is filled between the grid-type expansion strips 2 or / and inside the grid. That is, filler adhesive is inserted between the sleeve 1 and the grid-type expansion strips 2. When the spiral or pin enters the sleeve 1, the filler adhesive is squeezed outwards, making the hole wall fuller, the pull-out force stronger, and the connection more secure. Alternatively, adhesive is filled inside the grid formed by the groove 3 and the snap-fit ​​piece 4. Adhesive is filled between the grid-type expansion strips 2 or / and inside the grid, and installed into the corresponding anchor hole. When the expansion element is inserted into the sleeve 1 by screwing or tapping until it reaches the expansion part, i.e., the grid-type expansion strip, the adhesive inside the grid-type expansion strip is compressed and fuses with the adhesive on the grid. At the same time, the overflowing adhesive connects with the anchor hole wall, solidifying to form a whole to improve the pull-out force and achieve a more ideal anchoring effect. It should be noted that the adhesive is applied inside the sleeve, between the grid-type expansion bars, and inside the grid to ensure that the adhesive in the anchor hole reaches the preset saturation level, thereby achieving the bonding effect. Therefore, different adhesive application methods can be selected according to the expected adhesive saturation level to achieve the corresponding bonding effect.

[0057] The sleeve 1 has a through hole 8 pre-reserved on its peripheral sidewall at the location of the grid-type expansion strip 2, or / and the peripheral sidewall of the sleeve 1 has a through hole, through which adhesive is applied to the sleeve 1. That is, when the grid-type expansion strip 2 is set on the peripheral sidewall of the sleeve 1, a through hole 8 is opened on the peripheral sidewall of the sleeve 1, the grid-type expansion strip 2 is set at the through hole 8, and adhesive is applied to the sleeve 1 from the gap between the edge of the grid-type expansion strip 2 and the through hole 8. When the peripheral sidewall of the sleeve 1 does not have a grid-type expansion strip 2, a through hole is specially reserved on the peripheral sidewall of the sleeve 1 for adhesive application. After the adhesive is applied to the sleeve, it is inserted into the corresponding anchor hole. When the expansion element is inserted into the sleeve 1 by screwing or tapping, the adhesive tape set in the sleeve can be moved to the expansion part. At the same time, the adhesive will overflow into the gap of the expansion strip and connect with the anchor hole wall, and solidify into a whole to improve the pull-out force and achieve a more ideal anchoring effect.

[0058] A sealant is provided at the head or inside of the sleeve 1, at the end furthest from the expansion strip. This sealant differs from ordinary structural adhesive in that it does not provide pull-out resistance; instead, it isolates the sleeve 1 from external air. If the expansion device is preferably made of ordinary metal, air can easily enter without sealant, leading to oxidation and rust. The sealant prevents or hinders airflow, thus providing an anti-oxidation effect. While stainless steel can be used for the expansion component, it is expensive. Therefore, only the exposed portion of the expansion component needs to be made of stainless steel, saving material costs. The sealant can be pre-designed at the sleeve head or installed on-site for easy access of the expansion component. The expansion component has an anti-oxidation coating or / and is made directly of stainless steel.

[0059] The expansion element enters the sleeve 1 by screwing or striking. The sleeve 1 is equipped with corresponding threads or locking teeth for the expansion element to enter and exit. One end of the expansion element combined with the expansion device is a helical body and / or a nail and / or a barbed nail, while the other end is one of the following: bolt, screw, pointed nail, ram's head nail, hook nail, ball joint, locking nail, positioning nail, four-corner press nail, or pipe clamp. The other end can protrude from the wall for use, and the shape of the other end of the expansion element can be flexibly selected according to the needs of the application scenario.

[0060] The sleeve head end is provided with a balancing positioning fulcrum and / or thread and / or locking teeth for the expansion component. In this embodiment, the sleeve 1 head end is provided with a balancing positioning fulcrum 9 for the expansion component. The balancing positioning fulcrum 9 can be used as a thread and / or locking teeth. When the balancing positioning fulcrum 9 is used as both a thread and a locking teeth, it is because the front part of the expansion component is set as a nail or a barbed nail, and the rear part is partially threaded. When the nail is driven into the screw point and it is difficult to go in, it is screwed in. The balancing positioning fulcrum 9 can be a rack-like structure formed by stamping inward from the side wall of the sleeve 1 and / or a folding locking point stamped at the sleeve opening. Preferably, three rack-like structures and / or three folding locking points stamped at the sleeve opening are equidistantly arranged circumferentially on the side wall of the sleeve 1. When the expansion component enters the head end of the sleeve 1, it engages with the threaded balancing positioning fulcrum 9, so that the expansion component can remain parallel to the sleeve 1 and avoid the expansion component from becoming skewed, especially under hanging force, it is easier to become skewed. Therefore, it is imperative to set the balancing locking position 9.

[0061] The grid-type expansion bar 2 has inwardly bent gaskets 10 on its left and / or right sides, and the gaskets 10 are provided in one, two or more pieces. When the expansion member enters or passes through the expansion device, the gaskets 10 are located at the protrusions or recesses of the threads or pins of the expansion member.

[0062] When the gasket 10 is located at the recessed part of the thread of the expansion element, that is, when the gasket 10 mates with the thread of the expansion element, the gasket 10 acts as an internal thread, making the connection between the expansion element and the expansion device more secure. When the gasket 10 is located at the convex part of the thread of the expansion element, it is equivalent to thickening the inner side of the grid-type expansion bar 2, allowing the expansion element to open the grid-type expansion bar 2 further outward, improving the connection strength with the hole wall.

[0063] The gasket 10 can be placed only on the left or right side of the grid-type expansion bar 2. The gasket 10 is either tightly attached to the inner surface of the grid-type expansion bar 2 or integrated with it, flush with it, or with a reserved gap. The gasket 10 is bent along the thread direction of the expansion member, so that the expansion member will not be stuck by the gasket 10 when screwed in. It should be noted that the threads of the expansion member can have notches. Because if the gasket 10 is not connected to the spiral direction when screwed in, its notch will get stuck at the tail end of the gasket 10, affecting the screwing process of the expansion member. Therefore, it is preferable that the gasket 10 is bent along the thread direction of the expansion member, which makes it easier for the expansion member to enter. Since the threads of the expansion member have notches, the notches act as an obstacle point when the expansion member is withdrawn, playing a certain role in preventing loosening and falling off.

[0064] like Figure 6 As shown, the tail end of the expansion device can also be equipped with an adhesive applicator 11 for applying adhesive, which squeezes out the adhesive from the applicator 11 when the expansion member is screwed in. The adhesive applicator 11 can be made of metal, nylon, or plastic, and can be in the form of a spring, a strip, or a hollow tube. Alternatively, the adhesive applicator 11 can be omitted at the tail end of the expansion device, and the expansion device can be used in conjunction with a chemical adhesive tube. In this embodiment, a spring-shaped adhesive applicator 11 is used, that is, the spring is sleeved on the expansion device. The spring is elastic and can expand outward when the expansion member enters the expansion device. It should be noted that the adhesive applicator must first be able to apply adhesive, and the design aims to apply as much adhesive as possible in the same space and volume. Second, this adhesive applicator must be able to compress and deform under pressure so that the adhesive overflows and flows back, solidifying so that the expansion device not only has an expansion force but also an adhesive fixing effect, ultimately achieving a better anchoring effect.

[0065] It should be noted that the shape of sleeve 1, i.e., its cross-section, can be circular, polygonal, plum blossom-shaped, or wavy, without affecting the installation of grid-type expansion bars, as long as it facilitates the entry and exit of the expansion component.

[0066] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the design concept of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An inflatable device comprising a sleeve having a deflating device thereon, the deflating device comprising one or two or more strips provided on the sleeve, the strips expanding outwardly when the inflatable member enters or passes through the deflating device, characterised in that: The outer side of the expansion strip is provided with a groove, the groove is arranged along the length direction of the expansion strip, and one or two or more clamping pieces are arranged on the groove of the expansion strip, so that a grid type expansion strip is formed, and a plurality of clamping pieces are arranged on the groove.

2. An inflation device according to claim 1, wherein: The side wall of the groove on one side or both sides is bent inward to form a clamping piece, the bending degree between the clamping pieces is the same or different, when the clamping piece is two or more and is arranged on one side, a grid shape is formed in combination with the side wall; when the clamping piece is two or more and is arranged on both sides, a grid shape is formed in combination with the side wall, and the clamping pieces on both sides are arranged symmetrically or staggered.

3. An inflation device according to claim 1, wherein: The expansion device includes one or two or more grid type expansion strips arranged on the sleeve, or the expansion device includes one or two or more first expansion strips and one or two or more second expansion strips arranged on the sleeve, the first expansion strip is the grid type expansion strip, and the second expansion strip is one or more of a strip-shaped expansion strip, a zigzag expansion strip, a U-shaped expansion strip, a W-shaped expansion strip, an S-shaped expansion strip, a V-shaped expansion strip, and a baffle, and the first expansion strip and the second expansion strip are arranged in combination at intervals.

4. An inflation device according to claim 1, wherein: When the expansion device includes two or more grid type expansion strips arranged on the sleeve, the number of clamping pieces arranged on the grid type expansion strips is different or the same, and the grid formed by the clamping pieces and the groove is a square grid, a trapezoidal grid or a multi-edge grid.

5. An inflation device according to claim 1, wherein: When a plurality of clamping pieces are arranged on the grid type expansion strip, a plurality of grids are generated for each grid type expansion strip, when the expansion device includes two or more grid type expansion strips arranged on the sleeve, the grids between the two or more grid type expansion strips are arranged in a surrounding manner, and the surrounding manner includes any one of a surrounding spiral arrangement, a flush surrounding arrangement and a staggered surrounding arrangement.

6. An inflation device according to claim 1, wherein: The grid type expansion strip is arranged at one end of the sleeve or / and the sleeve, and the grid type expansion strip is arranged on the circumferential side of the sleeve, and one end of the grid type expansion strip is connected to the circumferential wall of the sleeve.

7. An inflation device according to claim 1, wherein: The end of the grid type expansion strip away from the sleeve connection is provided with a bending part, the bending part is located on the outer side of the grid type expansion strip, the end of the bending part is outwardly tilted or the bending part is zigzag or corrugated and the end is outwardly tilted, or the bending part is directly inclined upward or zigzag or corrugated; Or / and the end of the grid type expansion strip away from the sleeve connection is provided with a bending part, the bending part is located on the outer side of the grid type expansion strip, and a clamping piece is arranged on the bending part. The shape of the sleeve is circular, polygonal, plum blossom-shaped or wavy.

8. An inflation device according to claim 1, wherein: The inner surface or / and outer surface of the grid-shaped expansion strip or / and strip-shaped expansion strip or / and sawtooth-shaped expansion strip or / and U-shaped expansion strip or / and W-shaped expansion strip or / and S-shaped expansion strip or / and V-shaped expansion strip or / and baffle is provided with concave or / and convex or / and nail strike or / and nail prick; or, the outer surface of the grid-shaped expansion strip or / and strip-shaped expansion strip or / and sawtooth-shaped expansion strip or / and U-shaped expansion strip or / and W-shaped expansion strip or / and S-shaped expansion strip or / and V-shaped expansion strip or / and baffle is provided with a filler, and the filler comprises one or more of metal material, plastic material, wood bamboo material, nylon material, chemical hose, carbonized wood bamboo, and fiber. The clamping piece is arranged on the side of the concave or / and convex or / and nail strike or / and nail prick close to the sleeve.

9. An inflation device according to claim 1, wherein: The inside of the sleeve is provided with glue, or / and when two or more grid-shaped expansion strips are arranged on the sleeve, glue is arranged between the grid-shaped expansion strips or / and in the grid; or, a through hole is reserved on the circumferential wall of the sleeve at the arrangement position of the grid-shaped expansion strip, or / and a through hole is formed on the circumferential wall of the sleeve, and glue is planted into the sleeve through the through hole; or / and the head of the sleeve is provided with sealing glue; the expansion member is provided with an anti-oxidation coating or / and directly uses stainless steel material.

10. An inflation device according to claim 1, wherein: The sleeve is provided with a screw thread or a clamping tooth through which the expansion member enters and exits, one end of the expansion member combined with the expansion device is a spiral body or / and a nail or / and a spiked nail, and the other end is one of a bolt, a screw, a pointed nail, a sheep head nail, a hook nail, a spherical joint, a clamping nail, a positioning nail, a four-corner pressing nail, and a pipe clamp; The head end of the sleeve is provided with a balance positioning fulcrum of the expansion member or / and a screw thread or / and a clamping tooth, or the head end of the sleeve is provided with a balance positioning fulcrum of the expansion member, and the balance positioning fulcrum can be used as a screw thread or / and a clamping tooth.

11. An inflation device according to claim 1, wherein: The left side or / and the right side of the grid-shaped expansion strip is provided with a gasket bent inwardly to the inner surface side, and the gasket is provided with one piece or two pieces or multiple pieces.

12. An inflation device according to claim 11, wherein: The gasket is arranged on the left side or the right side of the grid-shaped expansion strip, the gasket is integrally adhered to the inner surface of the grid-shaped expansion strip, or the gasket is integrally adhered to the inner surface of the grid-shaped expansion strip, or the gasket is arranged in a flush manner or with a reserved gap, and the gasket is arranged in a bent manner along the thread direction of the expansion member; when the expansion member enters or passes through the expansion device, the gasket is located at the protrusion or recess of the thread of the expansion member.

13. An inflation device according to claim 1, wherein: The tail end of the expansion device is provided with a glue attaching device for glue, and the glue attaching device is made of metal material, nylon material or plastic material, or the expansion device is used in cooperation with a chemical hose.

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