Integral expansion bolts fastened to the wall

Abstract

The present invention belongs to the technical field of fastening devices, and in particular refers to an integral expansion bolt suitable for fastening to a wall or similar parts such as furniture board connections. Its characteristics are that the transmission rod portion is sleeved with a screw sleeve integrally arranged with the expansion tube, the inner diameter of the screw sleeve is not less than the outer diameter of the entire screw, the inner hole of the end of the screw sleeve is sleeved with a shaft sleeve and axially fixedly matched therewith, and the inner diameter of the shaft sleeve or / and the screw sleeve after combination is not less than the outer diameter of the transmission rod portion and less than the outer diameter of the expansion rod portion. The above invention solves the problem of the integrity of the bolt and the expansion tube, and at the same time, the integral arrangement of the expansion tube and the screw sleeve improves the overall strength of the expansion bolt, and the arrangement of the integral screw sleeve ensures the positioning of the bolt, so that the integral expansion bolt has the advantages of convenient use and disassembly, firm connection, accurate positioning, and good reliability.

Description

Technical Field

[0001] The invention belongs to the technical field of fastening devices, and in particular relates to an integral expansion bolt suitable for fastening to a wall or similar parts such as furniture panels. Background Art

[0002] Traditional plate connections usually require expansion bolts to be fastened to the connecting plates first. Expansion bolts usually include separate bolts and expansion tubes, and the expansion tubes are provided with expansion blocks that can expand circumferentially. When in use, the expansion tube is inserted into the pre-punched installation hole on the connecting plate, and then the bolts are screwed in to expand the expansion tube and tighten it in the installation hole, thereby achieving the purpose of fastening the expansion bolts to the connecting plate. The disadvantage is that it is not easy to use the expansion tube when it is used again, and it is difficult to replace damaged parts, and even requires drilling again. At the same time, due to poor integrity, the bolt positioning is inaccurate, which affects the accuracy of plate connection.

[0003] Another method is to combine the bolt and the expansion tube and insert them into the pre-punched installation hole of the connecting plate, and then rotate the bolt to open the expansion tube and tighten it in the installation hole, so as to achieve the purpose of fastening the expansion bolt assembly to the connecting plate. For example, the prior art with application number CN201820636795.9 and the name of furniture connector, and application number 201710886973.3 and the name of expansion bolt kit, all adopt this structure of combining bolts and expansion tubes together. At the same time, in order to solve the problem of the overall combination of bolts and expansion tubes, the expansion tube is designed as a split structure. However, the problem is that the overall strength of the expansion tube is reduced, which leads to a decrease in the connection strength and reliability of the expansion bolt assembly and the connecting plate. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide an integral expansion bolt fastened in the wall which has a simple structure, is easy to install and disassemble, has high connection strength and good reliability.

[0005] The integral expansion bolt fastened in the wall described in the present invention comprises a bolt and an expansion tube, the bolt consists of a screw and a bolt head, the screw comprises a transmission rod portion resting on one end of the bolt head and an expansion rod portion at the other end, the expansion rod portion is a screw with an external thread, and the outer diameter of the expansion rod portion is larger than the outer diameter of the transmission rod portion, the expansion tube and the expansion rod portion are coaxially arranged correspondingly, the expansion tube is provided with a conical screw hole, the aperture of the conical screw hole gradually decreases along the direction in which the screw is screwed into the expansion tube, the expansion tube is provided with an axial cutout, the axial cutouts are evenly distributed along the circumference of the expansion tube, and the expansion tube is divided into expansion blocks that can expand radially, and is characterized in that: the transmission rod portion is sleeved with a screw sleeve integrally arranged with the expansion tube, the inner aperture of the screw sleeve is not less than the outer diameter of the entire screw, the inner aperture of the end of the screw sleeve is sleeved with a shaft sleeve and axially fixedly matched with it, and the inner aperture of the shaft sleeve or / and the screw sleeve after combination is not less than the outer diameter of the transmission rod portion and is smaller than the outer diameter of the expansion rod portion.

[0006] The present invention solves the problem of the integrity of the bolt and the expansion tube. At the same time, the integrated arrangement of the expansion tube and the screw sleeve improves the overall strength of the expansion bolt, and the arrangement of the integral screw sleeve ensures the positioning of the bolt, thereby making the integral expansion bolt have the advantages of easy use and disassembly, firm connection, accurate positioning, good reliability, etc.

[0007] Preferably, the present invention sets the sleeve as an open-close combination, the sleeve is an open-close combination of bore tubes, the combined sleeve is coaxially arranged in the inner hole of the end of the screw sleeve and axially fixedly matched therewith, and the inner hole formed by the sleeve opening and closing combination itself has a hole diameter not less than the outer diameter of the transmission rod and less than the outer diameter of the expansion rod. The opening and closing part is preferably a sleeve that forms a full circle, regardless of the number of petals.

[0008] In a further preferred embodiment of the present invention, the sleeve of the open-and-close combination is set as a half-open structure, that is, the sleeve is a half-open combination hole tube, the combined sleeve coaxially sleeved in the inner hole of the screw sleeve has an outer thread on the outer tube wall, the corresponding screw sleeve inner hole wall has an inner thread and matches the outer thread on the sleeve outer tube wall, the sleeve hole tube end is provided with a shoulder step table, and its inner end face and the corresponding end face of the screw sleeve have a one-way rotating tooth surface matching structure. Or the sleeve is a half-open combination hole tube, the sleeve coaxially sleeved in the inner hole of the screw sleeve and matches it, the outer tube wall has a buckle, and the corresponding screw sleeve inner hole wall has a buckle lock hole; etc. Such a setting helps to prevent the sleeve from axial loosening after assembly with the screw sleeve, and the assembly is simple.

[0009] A further preferred embodiment of the present invention is that the shaft sleeve is an open-closed combined hole tube, and the opening and closing parts of the shaft sleeve are connected into a combined part by connecting ribs to facilitate assembly.

[0010] Of course, the present invention can also make structural arrangements for the installation position or whether the rotation is over-positioned according to needs. Preferably, a coaxial positioning ring is provided on the transmission rod, and the outer diameter of the positioning ring is larger than the inner diameter of the shaft sleeve or / and the screw sleeve after combination. The positioning ring is used to prevent the screw from being over-screwed and exceeding the expansion tube. In addition, the inner hole of the screw sleeve near one end of the expansion tube is provided with an internal thread and extends to match the conical screw hole in the expansion tube. The internal thread matches the external thread of the expansion rod. This makes it smoother for the screw to be screwed into the expansion tube.

[0011] The integral expansion bolt fastened in the wall described in the present invention can also be: comprising a bolt and an expansion tube, the bolt consisting of a screw and a bolt head, the screw comprising a transmission rod portion leaning against one end of the bolt head and an expansion rod portion at the other end, the expansion rod portion being a screw with an external thread, the expansion tube and the expansion rod portion being coaxially arranged correspondingly, the expansion tube being provided with a conical screw hole, the aperture of the conical screw hole gradually decreasing along the direction in which the screw is screwed into the expansion tube portion, the expansion tube being provided with an axial cutout, the axial cutouts being evenly distributed along the circumference of the expansion tube, dividing the expansion tube into expansion blocks that can expand radially, characterized in that: the transmission rod portion is sleeved with a screw sleeve integrally arranged with the expansion tube, the inner aperture of the screw sleeve is not less than the outer diameter of the entire screw, the transmission rod portion is composed of a connecting rod leaning against one end of the bolt head and a support shaft leaning against one end of the expansion rod portion, the screw sleeve is adapted to the maximum outer diameter of the support shaft of the transmission rod portion leaning against one end of the expansion rod portion.

[0012] The present invention solves the problem of the integrity of the bolt and the expansion tube. At the same time, the integrated arrangement of the expansion tube and the screw sleeve improves the overall strength of the expansion bolt, and the arrangement of the screw sleeve and the support shaft ensures the positioning of the bolt, so that the integral expansion bolt has the advantages of convenient use and disassembly, firm connection, accurate positioning, good reliability, etc. At the same time, due to the simple structure, it is very convenient to assemble and the cost is lower.

[0013] The integral expansion bolt fastened in the wall described in the present invention can also be: comprising a bolt and an expansion tube, the bolt is composed of a screw and a bolt head, the screw comprises a transmission rod portion leaning against one end of the bolt head and an expansion rod portion at the other end, the expansion rod portion is a screw with external threads, the expansion tube and the expansion rod portion are coaxially arranged correspondingly, the expansion tube portion is provided with an axial cutout, the axial cutout is evenly distributed along the circumference of the expansion tube portion, and the expansion tube portion is cut out to form an expansion block that can expand radially, characterized in that: the transmission rod portion is sleeved with a screw sleeve integrally arranged with the expansion tube, the inner diameter of the screw sleeve is not less than the outer diameter of the entire screw, the expansion tube is sleeved with an expansion plug that can slide axially relative to the expansion tube, the expansion plug is conical, its inner hole is provided with threads to form a connection with the screw with external threads, the expansion plug is axially moved by rotating the screw, the expansion tube is provided with an inner conical hole and its hole diameter gradually expands along the direction in which the screw is screwed in, and the conical shape and direction of the expansion plug are correspondingly adapted to the inner conical hole of the expansion tube.

[0014] The present invention solves the problem of the integrity of the bolt and the expansion tube. At the same time, the integrated arrangement of the expansion tube and the screw sleeve improves the overall strength of the expansion bolt, and the arrangement of the screw sleeve ensures the positioning of the bolt, so that the integral expansion bolt has the advantages of convenient use and disassembly, firm connection, accurate positioning, good reliability, etc. At the same time, due to the provision of a conical expansion plug, the expansion block is propped open through axial sliding with the conical hole in the expansion tube, thereby making the connection more firm.

[0015] In a further preferred embodiment of the present invention, a slider is provided on the inner wall of the inner conical hole of the expansion tube, and a slide groove is provided on the conical outer wall of the expansion slide plug to form an axial sliding structure corresponding to the expansion tube. Of course, a slide groove is provided on the inner wall of the inner conical hole of the expansion tube, and a slider is provided on the conical outer wall of the expansion slide plug to form an axial sliding structure corresponding to the expansion tube, which is also an equivalent solution.

[0016] The above structure not only ensures the axial sliding of the expansion plug relative to the expansion tube, but also avoids the circumferential relative rotation between the two, and is simple and reliable.

[0017] The screw with a support shaft can also be applied to the invention. A further preferred embodiment of the invention for the support shaft is that the support shaft is composed of at least one thin shaft with a smaller outer diameter and at least one thick shaft with a larger outer diameter. Usually, the thick shaft is close to one end of the connecting rod, and the outer diameter of the thick shaft matches the inner diameter of the screw sleeve. The structure is light in weight and low in cost.

[0018] A further preferred embodiment of the present invention is that a coaxial positioning ring is provided on the transmission rod portion for ensuring axial movement of the expansion slide plug by rotating the screw, and the outer diameter of the positioning ring is larger than the inner diameter of the screw sleeve.

[0019] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples to make the technical solution of the present invention more specific and detailed. However, it is obvious that the implementation of the present invention is not limited by these accompanying drawings and examples, and any changes, combinations, etc. made without departing from the essence of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 : A schematic diagram of embodiment 1 of the present invention;

[0021] Figure 2 : A schematic diagram of Embodiment 2 of the present invention;

[0022] Figure 3 : A cross-sectional view of the structure of Embodiment 1 of the present invention;

[0023] Figure 4: A cross-sectional view of the structure of Embodiment 2 of the present invention;

[0024] Figure 5 : Schematic diagram of the component structure of embodiments 1, 2 and 3 of the present invention;

[0025] Figure 6 : The appearance and structural cross-sectional view of embodiment 4 of the present invention;

[0026] Figure 7 : Schematic diagram of the external structure of three screws of Example 4 of the present invention;

[0027] Figure 8 : Schematic diagram of the appearance and structure of Example 5 of the present invention;

[0028] Fig. 9 : A cross-sectional view of the tensioned structure of Example 5 of the present invention;

[0029] Fig.10 : Schematic diagram of the external structure of three screws and other components of Example 5 of the present invention

[0030] Among them: 11. screw rod, 12. bolt head, 111. support shaft, 112. connecting rod, 113. positioning ring, 2. expansion tube, 21. axial incision, 22. expansion block, 23. slider, 3. screw sleeve, 31. snap lock hole, 4. sleeve, 41. combined sleeve connected by connecting ribs, 42. combined positioning column, 43. snap, 5. expansion slide plug, 51. slide groove. Example

[0031] like Figure 1-5As shown, there are 3 embodiments of the invention, all of which include a bolt and an expansion tube 2. The bolt is composed of a screw 11 and a bolt head 12. The screw 11 includes a transmission rod portion resting on one end of the bolt head and an expansion rod portion at the other end. The expansion rod portion is a screw with an external thread, and the outer diameter of the expansion rod portion is greater than the outer diameter of the transmission rod portion. The expansion tube 2 is coaxially arranged corresponding to the expansion rod portion. The expansion tube 2 is provided with a conical screw hole. The diameter of the conical screw hole gradually decreases along the direction in which the screw 11 is screwed into the expansion tube. The expansion tube 2 is provided with an axial cutout 21 The axial cuts are evenly distributed along the circumference of the expansion tube, and the expansion tube 2 is divided into expansion blocks 22 that can expand radially. The transmission rod is sleeved with a screw sleeve 3 that is integrally set with the expansion tube 2. The inner diameter of the screw sleeve 3 is not less than the outer diameter of the entire screw 11, of course excluding the positioning ring 113 thereon. Generally, it is ideal to be slightly larger and a little bit tight. The inner hole of the end of the screw sleeve 3 is sleeved with a shaft sleeve 4 and axially fixedly matched with it. Of course, axial fixed matching is a relative concept, and a little slippage is also acceptable. The inner diameter of the shaft sleeve 4 or / and the screw sleeve 3 after combination is not less than the outer diameter of the transmission rod and smaller than the outer diameter of the expansion rod. That is, the sleeve 4 can be a single-petal combination with the screw sleeve 3, or a multi-petal combination with the screw sleeve 3. The sleeve 4 of embodiments 1 and 2 is a hole tube that is opened in half, that is, a two-petal combination. The combined sleeve 4 is provided with a combined positioning column 42 according to needs, and is coaxially sleeved in the inner hole at the end of the screw sleeve 3 and axially fixedly matched therewith. The inner hole formed by the sleeve 4 assembly itself has a hole diameter that is not less than the outer diameter of the transmission rod portion but less than the outer diameter of the expansion rod portion. The combined sleeve 4 of embodiment 1 is coaxially sleeved in the inner hole of the screw sleeve 3 and has an external thread on the outer tube wall, and the corresponding screw sleeve 3 has an internal thread on the inner hole wall and matches the external thread on the outer tube wall of the sleeve 4. The end of the hole tube of the sleeve 4 is provided with a shoulder step surface, and its inner end face and the corresponding end face of the screw sleeve 3 have a unidirectional rotating tooth surface matching structure, so that it forms an axial fixed match after being in place. In another embodiment, the sleeve 4 is coaxially sleeved in the inner hole of the screw sleeve 3 and cooperates therewith, and has a buckle 43 on its outer tube wall, and a buckle lock hole 31 is provided on the inner hole wall of the corresponding screw sleeve 3. In yet another embodiment, the sleeve 4 is also a double-opening combined hole tube, and the opening and closing parts of the sleeve 4 are connected to form a combination by connecting ribs, which is referred to as a combined sleeve 41 connected by connecting ribs. The transmission rod portion of the above embodiment is provided with a coaxial positioning ring 113 for preventing the screw 11 from being over-screwed and exceeding the expansion tube 2. The outer diameter of the positioning ring 113 is larger than the inner hole diameter of the screw sleeve 3. The inner hole of the screw sleeve 3 close to one end of the expansion tube 2 is provided with an internal thread and extends to match the inner conical screw hole of the expansion tube 2. The internal thread matches the external thread of the expansion rod portion.

[0032] like Figure 6-7As shown, Example 4 of the present invention adopts a different structural method from Examples 1-3, and still includes a bolt and an expansion tube 2. The bolt is composed of a screw 11 and a bolt head 12. The screw 11 includes a transmission rod portion resting on one end of the bolt head 12 and an expansion rod portion at the other end. The expansion rod portion is a screw 11 with an external thread. The expansion tube 2 is coaxially arranged corresponding to the expansion rod portion. The expansion tube 2 is provided with a conical screw hole. The aperture of the conical screw hole gradually decreases along the direction in which the screw 11 is screwed into the expansion tube portion. The expansion tube 2 is provided with an axial cutout 21. The axial cutout 21 is evenly distributed along the circumference of the expansion tube 2 to expand the expansion tube. 2 is divided into an expansion block 22 that can expand radially, the transmission rod portion is sleeved with a screw sleeve 3 that is integrally arranged with the expansion tube 2, the inner diameter of the screw sleeve 3 is not less than the outer diameter of the entire screw 11, the transmission rod portion is composed of a connecting rod 112 leaning against one end of the bolt head and a support shaft 111 leaning against one end of the expansion rod portion. In this embodiment, it is preferred that the maximum outer diameter of the support shaft 111 is not less than the outer diameter of the expansion rod portion. In addition, in general, the outer diameter of the connecting rod 112 is smaller than the outer diameter of the expansion rod portion, and the screw sleeve 3 is adapted to the maximum outer diameter of the support shaft 111 of the transmission rod portion leaning against one end of the expansion rod portion. The supporting shaft 111 of the transmission rod part against one end of the expansion rod part is composed of at least one thin shaft with a smaller outer diameter and at least one thick shaft with a larger outer diameter, wherein the thick shaft can be one or more, and their outer diameters are generally consistent, and the thin shaft with a smaller outer diameter can be an original part of the transmission rod part; or the thin shaft with a smaller outer diameter against one end of the expansion rod part and the thick shaft with a larger outer diameter against one end of the connecting rod, that is, the supporting shaft 111 can be no less than two and the outer diameters are inconsistent, and it is obvious that the outer diameter of the thick shaft mentioned above is compatible with the inner diameter of the screw sleeve 3. That is to say, Embodiment 4 actually includes several different screws 11 with supporting shafts 111. A coaxial positioning ring 113 is provided between the connecting rod 112 of the transmission rod part and the support shaft 111 to prevent the screw 11 from being over-screwed and exceeding the expansion tube 2. The outer diameter of the positioning ring 113 is larger than the maximum outer diameter of the support shaft 111. The inner hole of the screw sleeve 3 near one end of the expansion tube 2 is provided with an internal thread and extends to match the inner conical screw hole of the expansion tube 2. The internal thread matches the external thread of the expansion rod part.

[0033] like Figure 8-10As shown, embodiment 5 of the present invention adopts a different structural mode from embodiments 1-4, and still includes a bolt and an expansion tube 2. The bolt is composed of a screw 11 and a bolt head 12. The screw 11 includes a transmission rod portion resting on one end of the bolt head 12 and an expansion rod portion at the other end. The expansion rod portion is a screw 11 with an external thread. The expansion tube 2 is coaxially arranged corresponding to the expansion rod portion. The expansion tube 2 is provided with an axial cutout 21. The axial cutout 21 is evenly distributed along the circumference of the expansion tube 2, dividing the expansion tube 2 into an expansion block 22 that can expand radially. The transmission rod portion is sleeved A screw sleeve 3 is provided which is integrally arranged with the expansion tube 2. The inner diameter of the screw sleeve 3 is not less than the outer diameter of the entire screw 11. The expansion tube 2 is sleeved with an expansion plug 5 which can slide axially relative to the expansion tube 2. The expansion plug 5 is conical in shape, and its inner hole is provided with threads to form a connection with the screw 11 with external threads. The expansion plug 5 is axially moved by rotating the screw 11. The expansion tube 2 is provided with an inner conical hole and its hole diameter gradually expands along the direction in which the screw is screwed in. The conical shape and direction of the expansion plug 5 are adapted to the inner conical hole of the expansion tube 2. A slider 23 is provided in the inner hole of the expansion tube 2, and a slide groove 51 is provided on the conical outer wall of the expansion plug 5 to form an axial sliding structure relative to the expansion tube 2. The transmission rod part is provided with a coaxial positioning ring 113 for ensuring that the expansion plug 5 moves axially by rotating the screw 11. The outer diameter of the positioning ring 113 is larger than the inner diameter of the screw sleeve 3.

[0034] In addition, the various screw rods 11 with support shafts 111 of Example 4 are also suitable as the screw rods 11 of this embodiment, that is, the transmission rod portion is composed of a connecting rod 112 resting on one end of the bolt head and a support shaft 111 resting on one end of the expansion rod portion, the maximum outer diameter of the support shaft 111 is not less than the outer diameter of the expansion rod portion, generally the outer diameter of the connecting rod 112 is smaller than the outer diameter of the expansion rod portion, the screw rod sleeve 3 is adapted to the maximum outer diameter of the support shaft 112 of the transmission rod portion resting on one end of the expansion rod portion, etc., and the details are not elaborated here.

Claims

1. An integral expansion bolt fastened in a wall, comprising a bolt and an expansion tube, wherein the bolt is composed of a screw and a bolt head, wherein the screw comprises a transmission rod portion resting on one end of the bolt head and an expansion rod portion at the other end, wherein the expansion rod portion is a screw with an external thread, and the outer diameter of the expansion rod portion is greater than the outer diameter of the transmission rod portion, wherein the expansion tube and the expansion rod portion are coaxially arranged correspondingly, the expansion tube is provided with a conical screw hole, the aperture of the conical screw hole gradually decreases along the direction in which the screw is screwed into the expansion tube, the expansion tube is provided with an axial cut, and the axial cut is evenly distributed along the circumference of the expansion tube, so as to divide the expansion tube into expansion blocks capable of radial expansion, wherein the expansion tube is characterized in that: The transmission rod portion is sleeved with a screw sleeve which is integrally arranged with the expansion tube. The inner diameter of the screw sleeve is not less than the outer diameter of the entire screw. The inner hole sleeve at the end of the screw sleeve is sleeved with a shaft sleeve and axially fixedly matched with it. The inner diameter of the shaft sleeve or / and the screw sleeve after combination is not less than the outer diameter of the transmission rod portion and is smaller than the outer diameter of the expansion rod portion. The shaft sleeve is an open and closed combined hole tube, and the combined shaft sleeve is provided with a combined positioning column.

2. The integral expansion bolt fastened in the wall according to claim 1, characterized in that: The combined shaft sleeve is coaxially sleeved in the inner hole of the screw sleeve end and axially fixedly matched therewith. The inner hole formed by the shaft sleeve opening and closing component combination itself has a hole diameter not smaller than the outer diameter of the transmission rod part but smaller than the outer diameter of the expansion rod part.

3. The integral expansion bolt fastened in the wall according to claim 2, characterized in that: The shaft sleeve is a hole tube that is opened in half. The combined shaft sleeve is coaxially sleeved and has an external thread on the outer tube wall in the inner hole of the screw sleeve. The corresponding screw sleeve inner hole wall has an internal thread and matches the external thread on the outer tube wall of the shaft sleeve. The end of the shaft sleeve hole tube is provided with a shoulder step surface, and its inner end face and the corresponding end face of the screw sleeve have a unidirectional rotating tooth surface matching structure.

4. The integral expansion bolt fastened in the wall according to claim 2, characterized in that: The shaft sleeve is a half-open hole tube, which is coaxially arranged in the inner hole of the screw sleeve and matched with it. The outer tube wall of the shaft sleeve has a buckle, and the inner hole wall of the corresponding screw sleeve has a buckle locking hole.

5. The integral expansion bolt fastened in the wall according to any one of claims 2 to 4, characterized in that: The shaft sleeve is an opening and closing combined hole tube, and the opening and closing parts of the shaft sleeve are connected to form a combined part by connecting ribs.

6. An integral expansion bolt fastened in a wall, comprising a bolt and an expansion tube, the bolt comprising a screw and a bolt head, the screw comprising a transmission rod portion resting on one end of the bolt head and an expansion rod portion at the other end, the expansion rod portion being a screw with an external thread, the expansion tube and the expansion rod portion being coaxially arranged correspondingly, the expansion tube being provided with a conical screw hole, the aperture of the conical screw hole gradually decreasing along the direction in which the screw is screwed into the expansion tube portion, the expansion tube being provided with an axial cut, the axial cut being evenly distributed along the circumference of the expansion tube, dividing the expansion tube into expansion blocks capable of radial expansion, characterized in that: The transmission rod portion is sleeved with a screw sleeve which is integrally arranged with the expansion tube, and the inner diameter of the screw sleeve is not less than the outer diameter of the entire screw. The transmission rod portion is composed of a connecting rod against one end of the bolt head and a support shaft against one end of the expansion rod portion. The screw sleeve is adapted to the maximum outer diameter of the support shaft of the transmission rod portion against one end of the expansion rod portion; the outer diameter of the connecting rod portion is smaller than the outer diameter of the expansion rod portion.

7. The integral expansion bolt fastened in the wall according to claim 6, characterized in that: The transmission rod part is supported by a supporting shaft at one end of the expansion rod part, and is composed of at least one section of a thin shaft with a smaller outer diameter and at least one section of a thick shaft with a larger outer diameter.

8. The integral expansion bolt fastened in the wall according to any one of claims 1, 2, 3, 4 or 6, characterized in that: The transmission rod portion is provided with a coaxial positioning ring for preventing the screw from being over-screwed and exceeding the expansion tube. The outer diameter of the positioning ring is larger than the inner diameter of the screw sleeve. The inner hole of the screw sleeve close to one end of the expansion tube is provided with an internal thread and extends to match the conical screw hole in the expansion tube. The internal thread matches the external thread of the expansion rod portion.

9. The integral expansion bolt fastened in the wall according to claim 5, characterized in that: The transmission rod portion is provided with a coaxial positioning ring for preventing the screw from being over-screwed and exceeding the expansion tube. The outer diameter of the positioning ring is larger than the inner diameter of the screw sleeve. The inner hole of the screw sleeve close to one end of the expansion tube is provided with an internal thread and extends to match the conical screw hole in the expansion tube. The internal thread matches the external thread of the expansion rod portion.

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