Stainless steel expansion screw connecting structure

Abstract

The utility model discloses a stainless steel expansion screw connecting structure, which relates to the technical field of expansion screws, and comprises an expansion pipe, the bottom of the expansion pipe is solid, the side wall of the expansion pipe is rotatably connected with a plurality of first elastic sheets, the plurality of first elastic sheets are annularly arranged, and the first elastic sheets are connected with the expansion pipe. The inner side walls of the multiple first elastic pieces are obliquely arranged, the side wall of the expansion pipe is rotationally connected with multiple second elastic pieces, the multiple second elastic pieces are annularly arranged, and the inner side walls of the multiple second elastic pieces are obliquely arranged; the outer hexagonal rotating block is screwed to drive the first elastic pieces and the second elastic pieces to abut against the inner wall of the hole at the same time, the extrusion area of the elastic pieces on the outer ring of the expansion pipe and the inner wall of the hole can be increased, the stress area of the expansion pipe during fixing is increased, and therefore the stability of the expansion pipe after fixing is improved.

Description

Technical Field

[0001] This utility model relates to the field of expansion screw technology, and in particular to a stainless steel expansion screw connection structure. Background Technology

[0002] Expansion bolts are secured by using a wedge-shaped inclination to cause the sleeve to expand, creating a frictional gripping force between it and the mounting hole surface, thus achieving a fixing effect. The design of expansion bolts must consider not only ease of installation but also functional stability.

[0003] For example, Chinese Patent Publication No. CN218598560U describes an expansion screw, comprising: a screw rod, a conical protrusion on the left end of the screw rod, the diameter of the conical protrusion decreasing from left to right, and a retaining connector on the right end of the screw rod; a nut, which is threaded onto the screw rod; and an expansion tube, which is fitted onto the screw rod and located between the conical protrusion and the nut, the expansion tube comprising a left tube portion and a right tube portion integrally connected, the left tube portion being frustum-shaped, the diameter of the left tube portion decreasing from left to right, and the left tube portion being divided by an opening into several spreading plates arranged at equal angles around the central axis of the expansion tube.

[0004] However, in the above solution, when the device is in use, the nut is turned to drive the protrusion to squeeze multiple spreading plates to expand, thereby fixing the expansion tube. Since the spreading plates are located at one end of the expansion tube, the expansion tube is only subjected to force at one end when it is fixed, which affects the fixing effect of the expansion tube. Utility Model Content

[0005] This utility model provides a stainless steel expansion screw connection structure to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A stainless steel expansion screw connection structure includes an expansion tube with a solid bottom. Multiple first elastic plates are rotatably connected to the sidewall of the expansion tube, arranged in a ring. The inner sidewalls of the multiple first elastic plates are all inclined. Multiple second elastic plates are rotatably connected to the sidewall of the expansion tube, also arranged in a ring, with their inner sidewalls inclined. The annular diameter of the middle of the multiple first elastic plates is larger than the annular diameter of the middle of the multiple second elastic plates.

[0008] The expansion tube has an internal thread at its top, and a connecting rod is connected to the internal thread of the expansion tube. The connecting rod has an external thread on its outer ring, and the connecting rod is threaded into the expansion tube through the external thread. A first tapered extrusion rod is fixedly connected to the bottom of the connecting rod, and a second tapered extrusion rod is fixedly connected to the bottom of the first tapered extrusion rod. The second tapered extrusion rod is smaller than the aperture between the multiple first elastic plates. The second tapered extrusion rod abuts against the inner sidewalls of the multiple second elastic plates, and the first tapered extrusion rod abuts against the inner sidewalls of the multiple first elastic plates.

[0009] As a further improvement to this technical solution: an external hexagonal rotating block is fixedly connected to the top of the connecting rod, and the external hexagonal rotating block is used to drive the connecting rod to rotate.

[0010] As a further improvement to this technical solution: each of the first elastic plates and each of the second elastic plates has multiple conical spikes fixedly connected to its sidewall.

[0011] As a further improvement to this technical solution: both the expansion tube and the connecting rod are made of high-strength stainless steel.

[0012] As a further improvement to this technical solution: the bottom of the expansion tube is tapered.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: When using this expansion screw, the expansion tube is inserted into the hole in the wall, and then the connecting rod is inserted into the expansion tube. The connecting rod drives the second conical extrusion rod and the first conical extrusion rod into the expansion tube. The second conical extrusion rod passes through the middle of multiple first elastic plates and abuts against the inner wall of multiple second elastic plates. At this time, the first conical extrusion rod abuts against the inner wall of multiple first elastic plates. By using a wrench to rotate the external hexagonal rotating block, the external hexagonal rotating block drives the connecting rod to rotate. When the connecting rod rotates, it can drive the first conical extrusion rod and the second conical extrusion rod to move into the expansion tube. The extrusion rods move downwards simultaneously. At this time, the first and second conical extrusion rods simultaneously extrude the sidewalls of multiple first and second elastic plates, causing the multiple first and second elastic plates to expand outwards and press against the inner wall of the hole. Then, the outer hexagonal rotating block is tightened, thereby completing the fixation of the expansion tube. By turning the outer hexagonal rotating block, multiple first and second elastic plates can be driven to press against the inner wall of the hole simultaneously, which can increase the extrusion area between the outer elastic plate of the expansion tube and the inner wall of the hole, increase the force-bearing area of ​​the expansion tube during fixation, and thus improve the stability of the expansion tube after fixation.

[0014] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it according to the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings. The specific implementation methods of this utility model are given in detail in the following embodiments and their accompanying drawings. Attached Figure Description

[0015] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0016] Figure 1 This is a front view schematic diagram of a stainless steel expansion screw connection structure proposed in this utility model;

[0017] Figure 2 This is a front cross-sectional view of a stainless steel expansion screw connection structure proposed in this utility model.

[0018] Figure 3 This is a cross-sectional diagram showing the disassembled structure of the expansion tube in a stainless steel expansion screw connection structure proposed in this utility model.

[0019] Figure 4 This is a top view of the expansion tube in a stainless steel expansion screw connection structure proposed in this utility model.

[0020] The attached diagram lists the components represented by each number as follows:

[0021] 1. Expansion tube; 2. First elastic plate; 3. Second elastic plate; 4. Conical burr; 5. External thread; 6. External hexagonal rotating block; 7. Connecting rod; 8. First conical extrusion rod; 9. Second conical extrusion rod; 10. Internal thread. Detailed Implementation

[0022] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are for illustrative purposes only and are not intended to limit the scope of this utility model. The utility model is described in more detail below by way of example with reference to the accompanying drawings. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of this utility model.

[0023] For examples, please refer to Figure 1-4This utility model provides a technical solution: a stainless steel expansion screw connection structure, including an expansion tube 1, the bottom of the expansion tube 1 is solid, a plurality of first elastic plates 2 are rotatably connected to the side wall of the expansion tube 1, the plurality of first elastic plates 2 are arranged in a ring, the inner side walls of the plurality of first elastic plates 2 are all inclined, a plurality of second elastic plates 3 are rotatably connected to the side wall of the expansion tube 1, the plurality of second elastic plates 3 are arranged in a ring, the inner side walls of the plurality of second elastic plates 3 are all inclined, and the annular hole diameter in the middle of the plurality of first elastic plates 2 is larger than the annular hole diameter in the middle of the plurality of second elastic plates 3;

[0024] The expansion tube 1 has an internal thread 10 at its top, and a connecting rod 7 is connected to the internal thread of the expansion tube 1. The outer ring of the connecting rod 7 has an external thread 5. The connecting rod 7 is threaded into the expansion tube 1 through the external thread 5. A first conical extrusion rod 8 is fixedly connected to the bottom of the connecting rod 7. A second conical extrusion rod 9 is fixedly connected to the bottom of the first conical extrusion rod 8. The second conical extrusion rod 9 is smaller than the aperture between the multiple first elastic plates 2. The second conical extrusion rod 9 simultaneously abuts against the inner sidewalls of the multiple second elastic plates 3, and the first conical extrusion rod 8 simultaneously abuts against the inner sidewalls of the multiple first elastic plates 2.

[0025] Please see Figure 1-3 The top of the connecting rod 7 is fixedly connected to an external hexagonal rotating block 6, which is used to drive the connecting rod 7 to rotate.

[0026] Specifically, when using this expansion screw, the expansion tube 1 is inserted into the hole in the wall, and then the connecting rod 7 is inserted into the expansion tube 1. The connecting rod 7 drives the second conical extrusion rod 9 and the first conical extrusion rod 8 into the expansion tube 1. The second conical extrusion rod 9 passes through the middle of multiple first elastic plates 2 and abuts against the inner wall of multiple second elastic plates 3. At this time, the first conical extrusion rod 8 abuts against the inner wall of multiple first elastic plates 2. By using a wrench to rotate the external hexagonal rotating block 6, the external hexagonal rotating block 6 drives the connecting rod 7 to rotate. When the connecting rod 7 rotates, it can drive the first conical extrusion rod 8 and the second conical extrusion rod 9 to move simultaneously. As the tube moves downward, the first conical extrusion rod 8 and the second conical extrusion rod 9 simultaneously extrude the sidewalls of multiple first elastic plates 2 and multiple second elastic plates 3, causing the multiple first elastic plates 2 and multiple second elastic plates 3 to expand outward simultaneously and press against the inner wall of the hole. Then, the outer hexagonal rotating block 6 is tightened, thereby completing the fixation of the expansion tube 1. By turning the outer hexagonal rotating block 6, the multiple first elastic plates 2 and multiple second elastic plates 3 can be driven to press against the inner wall of the hole simultaneously, which can increase the extrusion area between the outer elastic plate of the expansion tube 1 and the inner wall of the hole, increase the force-bearing area of ​​the expansion tube 1 when it is fixed, and thus improve the stability of the expansion tube 1 after it is fixed.

[0027] Please see Figure 1-4Each first elastic plate 2 and each second elastic plate 3 has multiple conical spikes 4 fixedly connected to its sidewall. The multiple conical spikes 4 can increase the friction between each first elastic plate 2 and each second elastic plate 3 and the hole in the wall, thereby improving the stability of the expansion tube 1 fixed in the hole.

[0028] Please see Figure 1-4 Both the expansion tube 1 and the connecting rod 7 are made of high-strength stainless steel, which improves their strength and extends their service life.

[0029] Please see Figure 1-3 The bottom of the expansion tube 1 is tapered, which makes it easy to insert the expansion tube 1 into the hole in the wall.

[0030] The working principle of this utility model is as follows: When using this expansion screw, the expansion tube 1 is inserted into the hole in the wall, and then the connecting rod 7 is inserted into the expansion tube 1. The connecting rod 7 drives the second conical extrusion rod 9 and the first conical extrusion rod 8 into the expansion tube 1. The second conical extrusion rod 9 passes through the middle of multiple first elastic plates 2 and abuts against the inner wall of multiple second elastic plates 3. At this time, the first conical extrusion rod 8 abuts against the inner wall of multiple first elastic plates 2. By using a wrench to rotate the external hexagonal rotating block 6, the external hexagonal rotating block 6 drives the connecting rod 7 to rotate. When the connecting rod 7 rotates, it can drive the first conical extrusion rod 8 and the second conical extrusion rod 9 to rotate. 9. Simultaneously move downwards. At this time, the first conical extrusion rod 8 and the second conical extrusion rod 9 simultaneously extrude the sidewalls of multiple first elastic plates 2 and multiple second elastic plates 3, causing multiple first elastic plates 2 and multiple second elastic plates 3 to expand outwards and press against the inner wall of the hole. Then, tighten the outer hexagonal rotating block 6 to complete the fixation of the expansion tube 1. By turning the outer hexagonal rotating block 6, multiple first elastic plates 2 and multiple second elastic plates 3 can be driven to press against the inner wall of the hole simultaneously, which can increase the extrusion area between the outer elastic plate of the expansion tube 1 and the inner wall of the hole, increase the force-bearing area of ​​the expansion tube 1 when it is fixed, and thus improve the stability of the expansion tube 1 after it is fixed.

[0031] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any way. Those skilled in the art can readily implement this utility model based on the accompanying drawings and the above description. However, any modifications, alterations, or variations made by those skilled in the art without departing from the scope of the utility model's technical solution, utilizing the disclosed technical content, are equivalent embodiments of this utility model. Furthermore, any equivalent changes, alterations, or variations made to the above embodiments based on the essential technology of this utility model are still within the protection scope of this utility model's technical solution.

Claims

1. A stainless steel expansion bolt connection structure, comprising an expansion tube (1), characterized in that, The bottom of the expansion tube (1) is solid. Multiple first elastic plates (2) are rotatably connected to the side wall of the expansion tube (1). The multiple first elastic plates (2) are arranged in a ring. The inner side walls of the multiple first elastic plates (2) are all inclined. Multiple second elastic plates (3) are rotatably connected to the side wall of the expansion tube (1). The multiple second elastic plates (3) are arranged in a ring. The inner side walls of the multiple second elastic plates (3) are all inclined. The annular aperture in the middle of the multiple first elastic plates (2) is larger than the annular aperture in the middle of the multiple second elastic plates (3). The expansion tube (1) has an internal thread (10) at the top. The expansion tube (1) is connected to a connecting rod (7) by the internal thread. The connecting rod (7) has an external thread (5) on its outer ring. The connecting rod (7) is threaded into the expansion tube (1) through the external thread (5). The bottom of the connecting rod (7) is fixedly connected to a first conical extrusion rod (8). The bottom of the first conical extrusion rod (8) is fixedly connected to a second conical extrusion rod (9). The second conical extrusion rod (9) is smaller than the aperture between the multiple first elastic plates (2). The second conical extrusion rod (9) simultaneously abuts against the inner wall of the multiple second elastic plates (3). The first conical extrusion rod (8) simultaneously abuts against the inner wall of the multiple first elastic plates (2).

2. The stainless steel expansion bolt connection structure according to claim 1, characterized in that, The top of the connecting rod (7) is fixedly connected to an external hexagonal rotating block (6), which is used to drive the connecting rod (7) to rotate.

3. The stainless steel expansion bolt connection structure according to claim 1, characterized in that, Each of the first elastic sheet (2) and each of the second elastic sheet (3) has multiple conical spikes (4) fixedly connected to its sidewall.

4. The stainless steel expansion bolt connection structure according to claim 1, characterized in that, Both the expansion tube (1) and the connecting rod (7) are made of high-strength stainless steel.

5. The stainless steel expansion bolt connection structure according to claim 1, characterized in that, The bottom of the expansion tube (1) is tapered.

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