Expansion bolt

Abstract

The utility model provides an expansion bolt, which belongs to the technical field of bolts and comprises a fastening pipe, a bolt, a fastener, a driving block and a nut. A plurality of fastening opening groups are formed in the fastening pipe, the plurality of fastening opening groups are arranged at intervals in the axis direction of the fastening pipe, and a plurality of fastening openings in the fastening opening groups are arranged in the circumferential direction of the fastening pipe; the bolt is arranged in the fastening pipe and has the degree of freedom of moving in the axis direction of the fastening pipe. The fasteners are rotationally connected to the corresponding fastening openings, and the fasteners are used for making contact with the inner walls of the mounting holes; the driving block is used for driving the fastener to rotate outwards from the fastening opening; the nut sleeves the bolt, is positioned at one end, far away from the conical expansion head, of the bolt, and is in threaded connection with the bolt. According to the expansion bolt provided by the utility model, the circumferential direction and the axial direction of the fastening pipe are fixed with the inner wall of the mounting hole by virtue of the plurality of fastening openings and the fastening pieces, so that the expansion bolt and the fixed body are fixed more firmly.

Description

Technical Field

[0001] The utility model belongs to the technical field of bolts, and in particular relates to an expansion bolt. Background Art

[0002] The expansion bolt consists of a countersunk bolt, an expansion tube, a flat washer, a spring washer and a hexagonal nut. When in use, first use an electric drill to drill a mounting hole of the corresponding size on the fixed body, install the expansion bolt into the mounting hole, and then tighten the nut; there is a conical expansion head at the tail of the bolt. As the nut rotates, the bolt moves in the expansion tube, and then the conical expansion head expands the expansion tube, thereby fixing the expansion bolt on the fixed body; however, this method makes the expansion bolt have a tightening force only between the expanded part of the expansion tube and the mounting hole, and there is no tightening force in other parts, which makes the expansion bolt not firmly fixed and easy to fall off. Utility Model Content

[0003] The embodiment of the utility model provides an expansion bolt and a steel pipe heating furnace to solve the technical problem in the prior art that the expansion bolt is not firmly fixed and is easy to fall off.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: to provide an expansion bolt, comprising:

[0005] A fastening tube, with a plurality of fastening opening groups on the outer surface; the plurality of fastening opening groups are arranged at intervals along the axial direction of the fastening tube, and the plurality of fastening openings in the fastening opening groups are arranged along the circumferential direction of the fastening tube; the fastening tube is used to be installed in the installation hole of the fixed body; an expansion tube is provided at one end of the fastening tube;

[0006] A bolt is arranged in the fastening tube and passes through the fastening tube and the expansion tube; the bolt has the freedom to move along the axis direction of the fastening tube, and one end of the bolt is provided with a conical expansion head;

[0007] There are multiple fasteners, which correspond to the multiple fastening openings one by one; the fasteners are rotatably connected to the corresponding fastening openings, and the fasteners are used to contact the inner wall of the mounting hole;

[0008] There are multiple driving blocks, all of which are fixed on the bolts; the multiple driving blocks correspond to the multiple fastening openings one by one, and the driving blocks are used to drive the fasteners to rotate outward from the fastening openings;

[0009] The nut is sleeved on the bolt and is located at an end of the bolt away from the conical expansion head. The nut is threadedly connected with the bolt.

[0010] In a possible implementation, the fastener includes a horizontal plate, a vertical plate and a rotating shaft; the horizontal plate is arranged in the fastening opening; one end of the vertical plate is fixed on the horizontal plate, and the other end passes through the fastening opening and is located inside the fastening tube; the rotating shaft is installed at one end of the horizontal plate close to the vertical plate, and is rotatably connected to the fastening opening.

[0011] In a possible implementation, a plurality of sharp portions are provided on a side of the transverse plate close to the mounting hole.

[0012] In a possible implementation, limiting members are provided on both sides of the transverse plate to limit the rotation of the fastener.

[0013] In a possible implementation, the limiting member includes two support plates, a slider and an elastic member; the two support plates are fixed on the inner wall of the fastening opening, and the two support plates are arranged in parallel and spaced apart, and a sliding space is provided between the two support plates; the slider is arranged in the sliding space, and one end extends out of the sliding space and contacts the side surface of the cross plate, which is used to limit the cross plate, and the slider has the freedom to move along the side wall of the support plate toward or away from the cross plate; the elastic member is arranged in the sliding space in a compressed state, and the two ends are respectively fixedly connected to the slider and the inner wall of the fastening opening.

[0014] In a possible implementation, the limiting member further includes a slide plate, which is fixed on the sliding block and located between the sliding block and the cross plate, and one side of the slide plate contacts the side surface of the cross plate for limiting the cross plate.

[0015] In a possible implementation, a ball bearing rotatably connected to the skateboard is provided on the skateboard, the ball bearing is located between the skateboard and the cross board, and the ball bearing has the freedom to roll along the side of the cross board.

[0016] In a possible implementation, a side of the driving block close to the vertical plate is provided with an inclined driving sliding surface, and the driving sliding surface corresponds to the vertical plate and is used to drive the vertical plate to rotate.

[0017] In a possible implementation manner, the horizontal plate and the vertical plate are integrally formed.

[0018] The beneficial effect of an expansion bolt provided by the utility model is that, compared with the prior art, the expansion bolt of the utility model, when used, because a plurality of fastening opening groups are opened on the outer surface of the fastening tube, and the plurality of fastening opening groups are arranged at intervals along the axial direction of the fastening tube, at the same time, the fastener is rotatably connected to the corresponding fastening opening, and the fastener is used to contact the inner wall of the mounting hole; therefore, after the fastening tube is installed in the mounting hole of the fixed body, the nut is rotated to drive the bolt to move in a direction away from the mounting hole, the bolt drives the driving block to move, and the driving block drives the fastener to rotate outward from the fastening opening, so that the fastener extending in the axial direction of the fastening tube contacts the inner wall of the mounting hole, thereby fixing the expansion bolt in the mounting hole; because the plurality of fastening openings in the fastening opening group are arranged along the circumference of the fastening tube, In the circumferential direction of the fastening tube, the fastener rotates outward and contacts the inner wall of the mounting hole, so that the expansion bolt is fixed more securely in the mounting hole; since an expansion tube is provided at one end of the fastening tube and a conical expansion head is provided at one end of the bolt, when the bolt moves, the conical expansion head moves in the expansion tube and expands the expansion tube, thereby fixing the expansion bolt; in this way, the expansion tube and the conical expansion head are used to expand the expansion tube, and at the same time, with the help of a plurality of fastening port groups arranged at intervals along the axial direction of the fastening tube, a plurality of fastening ports arranged circumferentially of the fastening tube, and the fastener that rotates outward and contacts the inner wall of the mounting hole, the fastening tube is fixed to the inner wall of the mounting hole in both the circumferential direction and the axial direction, thereby making the fixation between the expansion bolt and the fixed body more secure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 The structure of the expansion bolt provided by the embodiment of the utility model is schematically shown in FIG. Figure 1 ;

[0021] Figure 2 for Figure 1 The enlarged view of point A in the middle;

[0022] Figure 3 The structure of the expansion bolt provided by the embodiment of the utility model is schematically shown in FIG. Figure 2 ;

[0023] Figure 4 for Figure 3 The enlarged view of point B in the middle;

[0024] Figure 5The structure of the expansion bolt provided by the embodiment of the utility model is schematically shown in FIG. Figure 3 ;

[0025] Figure 6 for Figure 5 Enlarged view of point C in the middle;

[0026] Figure 7 A front view of an expansion bolt provided by an embodiment of the utility model;

[0027] Figure 8 for Figure 7 Enlarged view of point D in the middle.

[0028] Among them, the reference numerals in the figure are:

[0029] 1. Fastening tube; 11. Fastening port; 2. Bolt; 3. Fastener; 31. Horizontal plate; 32. Vertical plate; 33. Rotating shaft; 34. Sharp portion; 4. Driving block; 41. Driving sliding surface; 5. Limiting member; 51. Support plate; 52. Sliding block; 53. Elastic member; 54. Sliding space; 55. Slide plate; 56. Ball; 6. Expansion tube; 7. Conical expansion head; 8. Nut. DETAILED DESCRIPTION

[0030] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0031] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0032] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0034] See also Figures 1 to 8 The expansion bolt provided by the utility model is now described. An expansion bolt includes a fastening tube 1, a bolt 2, a fastener 3, a drive block 4 and a nut 8; a plurality of fastening opening groups are provided on the outer surface of the fastening tube 1, and the plurality of fastening opening groups are arranged at intervals along the axial direction of the fastening tube 1, and a plurality of fastening openings 11 in the fastening opening groups are arranged circumferentially along the fastening tube 1, and the fastening tube 1 is used to be installed in the installation hole of the fixed body, and an expansion tube 6 is provided at one end of the fastening tube 1; a bolt 2 is provided in the fastening tube 1, and passes through the fastening tube 1 and the expansion tube 6, and the bolt 2 has the freedom to move along the axial direction of the fastening tube 1, and one end of the bolt 2 A conical expansion head 7 is provided; there are multiple fasteners 3, which correspond one-to-one to multiple fastening openings 11, the fasteners 3 are rotatably connected to the corresponding fastening openings 11, and the fasteners 3 are used to contact the inner wall of the mounting hole; there are multiple driving blocks 4, which are all fixed on the bolt 2, the multiple driving blocks 4 correspond one-to-one to the multiple fastening openings 11, and the driving blocks 4 are used to drive the fasteners 3 to rotate outward from the fastening openings 11; the nut 8 is sleeved on the bolt 2, and is located at the end of the bolt 2 away from the conical expansion head 7, and the nut 8 is threadedly connected to the bolt 2.

[0035] Compared with the prior art, the expansion bolt provided in the present embodiment has a plurality of fastening opening groups on the outside of the fastening tube 1, and the plurality of fastening opening groups are arranged at intervals along the axial direction of the fastening tube 1, and at the same time, the fastener 3 is rotatably connected to the corresponding fastening opening 11, and the fastener 3 is used to contact the inner wall of the mounting hole; therefore, after the fastening tube 1 is installed in the mounting hole of the fixed body, the nut 8 is rotated to drive the bolt 2 to move in a direction away from the mounting hole, and the bolt 2 drives the driving block 4 to move, and the driving block 4 drives the fastener 3 to rotate outward from the fastening opening 11, so that the fastener 3 extending in the axial direction of the fastening tube 1 contacts the inner wall of the mounting hole, thereby fixing the expansion bolt in the mounting hole; since the plurality of fastening openings 11 in the fastening opening group are arranged along the circumferential direction of the fastening tube 1, In the circumferential direction of the tube 1, the fastener 3 rotates outward and contacts the inner wall of the mounting hole, so that the expansion bolt is fixed more securely in the mounting hole; since an expansion tube 6 is provided at one end of the fastening tube 1, and a conical expansion head 7 is provided at one end of the bolt 2, when the bolt 2 moves, the conical expansion head 7 moves in the expansion tube 6 and expands the expansion tube 6, thereby fixing the expansion bolt; in this way, the expansion tube 6 and the conical expansion head 7 are used to expand the expansion tube 6, and at the same time, with the help of a plurality of fastening port groups arranged at intervals along the axial direction of the fastening tube 1, a plurality of fastening ports 11 arranged circumferentially along the fastening tube 1, and the fastener 3 that rotates outward and contacts the inner wall of the mounting hole, the fastening tube 1 is contacted with the inner wall of the mounting hole in both the circumferential direction and the axial direction, thereby making the fixation between the expansion bolt and the fixed body more secure.

[0036] See also Figures 1 to 6 As a specific embodiment of the expansion bolt provided by the utility model, the fastener 3 includes a horizontal plate 31, a vertical plate 32 and a rotating shaft 33. The horizontal plate 31 is arranged in the fastening opening 11, one end of the vertical plate 32 is fixed on the horizontal plate 31, and the other end passes through the fastening opening 11 and is located inside the fastening tube 1, and the rotating shaft 33 is installed at the end of the horizontal plate 31 close to the vertical plate 32; when the driving block 4 drives the fastener 3 to contact the inner wall of the mounting hole, since the vertical plate 32 is arranged on the horizontal plate 31, and the horizontal plate 31 is arranged in the fastening opening 11, and the rotating shaft 33 is installed at the end of the horizontal plate 31 close to the vertical plate 32, the driving block 4 controls the vertical plate 32 to rotate, and the vertical plate 32 drives the horizontal plate 31 to rotate so that one end of the horizontal plate 31 extends out of the fastening opening 11 and contacts the inner wall of the mounting hole, thereby fixing the fastening tube 1 in the mounting hole.

[0037] See also Figures 1 to 6 As a specific embodiment of the expansion bolt provided by the utility model, a plurality of sharp portions 34 are provided on the side of the horizontal plate 31 close to the mounting hole; a plurality of sharp portions 34 are provided on the side of the horizontal plate 31 close to the mounting hole, and when the horizontal plate 31 rotates, the squeezing force between the vertical plate 32 and the inner wall of the mounting hole is enhanced, so that the fastening tube 1 is more firmly fixed in the mounting hole.

[0038] See also Figure 7 and Figure 8 As a specific implementation of the expansion bolt provided by the utility model, limit members 5 are provided on both sides of the horizontal plate 31 for limiting the rotation of the fastener 3; since the fastener 3 is rotatably connected to the fastening opening 11 through the rotating shaft 33, in order to limit the fastener 3 from rotating freely in the fastening opening 11, and at the same time prevent the sharp portion 34 from extending out of the fastening opening 11 following the random rotation of the horizontal plate 31 and causing scratches on the staff, limit members 5 are provided on both sides of the horizontal plate 31 to limit the rotation of the fastener 3 and at the same time limit the sharp portion 34 in the fastening opening 11.

[0039] See also Figure 7 and Figure 8 As a specific embodiment of the expansion bolt provided by the utility model, the limiter 5 includes two support plates 51, a slider 52 and an elastic member 53. The two support plates 51 are fixed on the side wall of the fastening opening 11, and the two support plates 51 are arranged in parallel and spaced apart. A sliding space 54 is provided between the two support plates 51. The slider 52 is arranged in the sliding space 54, and one end of the slider 52 extends out of the sliding space 54 to contact the side of the horizontal plate 31, which is used to limit the horizontal plate 31. The slider 52 has the freedom to move along the side wall of the support plate 51 toward or away from the horizontal plate 31. The elastic member 53 3 is arranged in the sliding space 54, and its two ends are respectively fixedly connected with the slider 52 and the inner wall of the fastening opening 11; since the slider 52 is arranged in the sliding space 54 between the two support plates 51, and one end extends out of the sliding space 54 to contact the transverse plate 31, and the elastic member 53 is arranged in the sliding space 54 in a compressed state, and its two ends are respectively fixedly connected with the slider 52 and the inner wall of the fastening opening 11, the elastic member 53 uses elastic force to push the slider 52 against the side of the transverse plate 31, thereby limiting the transverse plate 31 and preventing the transverse plate 31 from rotating at will, thereby limiting the rotation of the fastener 3. The elastic member 53 is a spring.

[0040] See also Figure 7 and Figure 8 As a specific embodiment of the expansion bolt provided by the utility model, the limiting member 5 also includes a slide plate 55, which is fixed on the slider 52, and the slide plate 55 is located between the slider 52 and the horizontal plate 31, and one side of the slide plate 55 is in contact with the side of the horizontal plate 31, which is used to limit the horizontal plate 31; the slide plate 55 is arranged on the slider 52, so that the slide plate 55 is located between the slider 52 and the side plate, and one side of the slide plate 55 is in contact with the side of the vertical plate 32, and the contact area between the slide plate 55 and the vertical plate 32 is increased by means of the slide plate 55, thereby further limiting the rotation of the horizontal plate 31.

[0041] See also Figure 7 and Figure 8As a specific embodiment of the expansion bolt provided by the utility model, a ball 56 rotatably connected to the slide plate 55 is provided on the slide plate 55, the ball 56 is located between the slide plate 55 and the cross plate 31, and the ball 56 has the freedom to roll along the side of the cross plate 31; since the ball 56 is rotatably connected to the slide plate 55, and the ball 56 has the freedom to roll along the side of the cross plate 31, when the driving block 4 drives the vertical plate 32 to rotate, and the vertical plate 32 drives the cross plate 31 to rotate and makes one end of the cross plate 31 extend out of the fastening port 11, the rotation of the cross plate 31 is more stable and smooth with the help of the ball 56.

[0042] See also Figure 2 , Figure 4 and Figure 6 As a specific implementation of the expansion bolt provided by the utility model, a driving block 4 is provided with an inclined driving sliding surface 41 on one side close to the vertical plate 32, and the driving sliding surface 41 corresponds to the vertical plate 32 and is used to drive the vertical plate 32 to rotate; since the driving block 4 is fixed on the bolt 2, and the driving sliding surface 41 corresponds to the vertical plate 32, when the bolt 2 moves, the driving block 4 moves synchronously, so that the driving inclined surface on the driving block 4 contacts the vertical plate 32, and as the driving block 4 moves, the driving inclined surface pushes the vertical plate 32 to rotate, thereby driving the horizontal plate 31 to rotate, and making one end of the horizontal plate 31 extend out of the fastening opening 11 and contact the inner wall of the mounting hole, thereby fixing the fastening tube 1 in the mounting hole.

[0043] See also Figure 2 , Figure 4 and Figure 6 As a specific implementation of the expansion bolt provided by the utility model, the horizontal plate 31 and the vertical plate 32 are integrally formed; the horizontal plate 31 and the vertical plate 32 are set as an integrally formed structure, which can save more raw materials in the manufacturing process, and no connecting parts are required for connection, and the structure is also more solid and durable.

[0044] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An expansion bolt, characterized in that: include: A fastening tube, with a plurality of fastening opening groups formed on the outer surface; The plurality of fastening opening groups are arranged at intervals along the axial direction of the fastening tube, and the plurality of fastening openings in the fastening opening group are arranged along the circumferential direction of the fastening tube; the fastening tube is used to be installed in the installation hole of the fixed body; an expansion tube is provided at one end of the fastening tube; A bolt is arranged in the fastening tube and passes through the fastening tube and the expansion tube; the bolt has the freedom to move along the axis direction of the fastening tube, and one end of the bolt is provided with a conical expansion head; There are multiple fasteners, which correspond to the multiple fastening openings one by one; the fasteners are rotatably connected to the corresponding fastening openings, and the fasteners are used to contact the inner wall of the mounting hole; There are multiple driving blocks, all of which are fixed on the bolts; the multiple driving blocks correspond to the multiple fastening openings one by one, and the driving blocks are used to drive the fasteners to rotate outward from the fastening openings; The nut is sleeved on the bolt and is located at an end of the bolt away from the conical expansion head. The nut is threadedly connected with the bolt.

2. An expansion bolt according to claim 1, characterized in that: The fastener includes a horizontal plate, a vertical plate and a rotating shaft; the horizontal plate is arranged in the fastening opening; one end of the vertical plate is fixed on the horizontal plate, and the other end passes through the fastening opening and is located inside the fastening tube; the rotating shaft is installed on one end of the horizontal plate close to the vertical plate, and is rotatably connected to the fastening opening.

3. An expansion bolt as claimed in claim 2, characterized in that: A plurality of sharp portions are arranged on the side surface of the transverse plate close to the mounting hole.

4. An expansion bolt as claimed in claim 3, characterized in that: Limiting pieces are provided on both sides of the transverse plate for limiting the rotation of the fastener.

5. An expansion bolt as claimed in claim 4, characterized in that: The limiting member includes two supporting plates, a sliding block and an elastic member; the two supporting plates are fixedly arranged on the inner wall of the fastening opening, and the two supporting plates are arranged in parallel and spaced apart, and a sliding space is provided between the two supporting plates; the sliding block is arranged in the sliding space, and one end extends out of the sliding space and contacts the side surface of the cross plate, which is used to limit the cross plate, and the sliding block has the freedom to move along the side wall of the supporting plate toward or away from the cross plate; the elastic member is arranged in the sliding space in a compressed state, and the two ends are respectively fixedly connected to the sliding block and the inner wall of the fastening opening.

6. An expansion bolt as claimed in claim 5, characterized in that: The limiting member also includes a slide plate, which is fixed on the sliding block and located between the sliding block and the transverse plate. One side of the slide plate contacts the side surface of the transverse plate to limit the transverse plate.

7. An expansion bolt as claimed in claim 6, characterized in that: The slide plate is provided with a ball bearing which is rotatably connected to the slide plate. The ball bearing is located between the slide plate and the transverse plate, and the ball bearing has the freedom to roll along the side surface of the transverse plate.

8. An expansion bolt as claimed in claim 2, characterized in that: A driving sliding surface arranged obliquely is provided on one side of the driving block close to the vertical plate. The driving sliding surface corresponds to the vertical plate and is used for driving the vertical plate to rotate.

9. An expansion bolt as claimed in claim 2, characterized in that: The horizontal plate and the vertical plate are integrally formed.

Images