Expansion pipe and expansion bolt

Abstract

The utility model relates to a bolt, and particularly discloses an expansion pipe and an expansion bolt. The expansion pipe comprises a pipe body, and an expansion channel is arranged in the pipe body. The pipe body sequentially comprises a head section, a middle section and a tail section in the axial direction. The head section comprises at least two expansion arms which are arranged in parallel in the axial direction; the middle subsection is provided with a deformation groove penetrating through the tube body in the radial direction, the deformation groove divides the tube body into two parallel and opposite expansion arms, the inner sides of the expansion arms are inwards sunken, a deformation guide line is formed in the sunken position, and the deformation guide line is perpendicular to the axis of the tube body. The expansion pipe can perform expansion deformation in different forms aiming at the base parts with different thicknesses, so that the expansion pipe is well suitable for the base parts with different thicknesses, and the connection reliability is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to a bolt, specifically relates to an expansion pipe and expansion bolt. BACKGROUND

[0002] Expansion bolt is a kind of threaded connecting piece for connecting equipment on wall surface, ground, board and other base parts.Compared with conventional bolt, expansion bolt includes expansion pipe, in use, by rotating bolt, bolt is screwed into expansion pipe, expansion pipe can expand and deform, and is expanded tightly with the opening on base part, so it has good connection reliability.

[0003] The length-diameter ratio of expansion bolt is usually large, in order to ensure the reliability of connection, the base part is usually provided with large-depth base hole corresponding to the expansion bolt for cooperation.But for the base part with small thickness, such as hollow brick, gypsum board and other thin board, even if the through hole is set, the effective contact length of base part and expansion bolt is limited, especially the conventional expansion bolt is usually provided with head expansion, and the expansion deformation capacity of tail part is weak, so the conventional expansion bolt structure has the risk of insufficient connection strength, and cannot guarantee the reliability of connection. SUMMARY

[0004] The utility model solves the technical problem to provide an expansion pipe and expansion bolt, and different forms of expansion deformation can be carried out for base parts with different thicknesses, which can well adapt to base parts with various thicknesses and guarantee the reliability of connection.

[0005] In order to solve the above technical problem, the utility model provides the technical scheme as follows: an expansion pipe, including pipe body, the pipe body is provided with expansion channel, the pipe body includes head section, middle section and tail section in sequence along the axial direction, the head section includes at least two expansion arms arranged in parallel along the axial direction,

[0006] The middle section is provided with deformation groove penetrating the pipe body along the radial direction, the deformation groove divides the pipe body into two parallel and opposite expansion arms, the inner side of the expansion arm is recessed inward, and the deformation guide line is formed at the recessed part, and the deformation guide line is perpendicular to the axis of the pipe body.

[0007] In use, the expansion pipe is inserted into the base hole of the base part in the direction of the head inward, and the matching screw is screwed into the expansion channel.

[0008] When the thickness of the base part used is large, after the expansion pipe is inserted into the base hole, the pipe body is completely placed in the base hole, when the screw is completely screwed in, the expansion arm of the head section is expanded outward and is pressed tightly with the hole wall of the base hole, to realize the connection between the expansion pipe and the base part.Meanwhile, the middle section is also expanded outward to a certain extent, to play an auxiliary connection role.

[0009] When the base thickness is small, the base hole is a through hole, after the expansion tube is inserted into the base hole, the middle section passes through the base hole and extends out, the screw is screwed into the head section, and the head section moves towards the tail section while the expansion arm bends outwards with the deformation guide line as the inflection point to prevent the expansion tube from being pulled out of the base hole, thereby realizing the connection of the expansion tube and the base.

[0010] The expansion tube of the present application can be deformed in different forms for different thicknesses of the base, well adapting to bases of various thicknesses and ensuring the reliability of the connection.

[0011] Preferably, the cross section of the deformation groove is in the shape of a rhombus.

[0012] Preferably, the side surface of the middle section is recessed inward to form a weakened area, and the number of the weakened areas is two and corresponds to the openings of the deformation grooves.

[0013] The weakened area can weaken the strength of the expansion arm, and the expansion arm can more easily enter the bending deformation state when used for a small-thickness base.

[0014] Preferably, the outer side surface of the middle section is provided with a guide groove, and the guide groove corresponds to the expansion arm; the guide groove is located between the middle section and the tail section.

[0015] The guide groove can guide the deformation of the expansion arm at a specific position, thereby better defining the applicable base thickness. Specifically, the length of the guide groove from the tail end of the tube body is the applicable base thickness.

[0016] Preferably, the outer side surface of the middle section is provided with a friction groove or a friction rib.

[0017] When used for a large-thickness base, the friction groove or the friction rib can increase the friction between the middle section and the base hole, thereby enhancing the connection reliability to a certain extent.

[0018] Preferably, the outer side surface of the tail section of the tube body is provided with a plurality of rib plates, and the rib plates extend along the axis of the tube body and are annularly and uniformly distributed around the axis of the tube body. The rib plates can well cooperate with the base to prevent the expansion tube from rotating during the screwing process, thereby ensuring the smooth operation of the connection.

[0019] Preferably, the tail section of the tube body is provided with an annular stop ring, and the annular stop ring can axially position the insertion of the tube body.

[0020] Preferably, the outer side of the expansion arm is connected with an auxiliary support arm, and the auxiliary support arm is arranged inside and outside the deformation guide line in correspondence; one end of the auxiliary support arm corresponding to the head section is fixedly arranged; in the deformed state of the tube body, the other end of the auxiliary support arm corresponding to the tail section is outwardly expanded.

[0021] When used in small thickness base, after the expansion arm is folded and deformed outward, the auxiliary support arm is expanded outward at the same time, which increases the outward expansion distance of the expansion arm, so as to improve the force to prevent the pipe body from exiting from the base hole, and enhance the reliability of the connection.

[0022] Preferably, the outer side of the expansion arm is provided with a containing groove, and the auxiliary support arm is partially or wholly embedded in the containing groove.

[0023] By providing the containing groove, the auxiliary support arm can be accommodated, so as to reduce the resistance of the pipe body inserted into the base hole, and the containing groove can weaken the expansion arm, so that the expansion arm can more easily enter the folded state.

[0024] An expansion bolt, comprising an expansion pipe and a screw, wherein the expansion pipe is the expansion pipe as described above. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 Fig. 4 is a structural schematic view of the expansion pipe in the expansion bolt of the present embodiment;

[0026] Figure 2 Fig. 5 is a structural schematic view of another perspective of the expansion pipe in the expansion bolt of the present embodiment;

[0027] Figure 3 Fig. 6 is a sectional view of the expansion pipe in the expansion bolt of the present embodiment;

[0028] Figure 4 Fig. 7 is an axial sectional view of the pipe body head section in the expansion bolt of the present embodiment;

[0029] Figure 5 Fig. 8 is a connection state diagram of the expansion bolt for small thickness base in the present embodiment. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the present utility model more clearly understood, the present utility model will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model, and are not used to limit the present utility model. EMBODIMENT

[0031] An expansion bolt, comprising an expansion pipe and a screw, wherein the expansion pipe comprises a pipe body, like Figure 2 and Figure 3As shown, the pipe body is provided with an expansion channel 4, in use, the expansion pipe is inserted into the base hole with the head inward, and the matching screw is screwed into the expansion channel 4. Specifically, the expansion channel 4 includes a first segment and a second segment, the first segment corresponds to the head segment 1, the intermediate segment 2 and the tail segment 3 correspond to the second segment, the diameter of the first segment is smaller than the diameter of the second segment, and specifically the diameter of the first segment is smaller than the diameter of the screw.

[0032] As shown in Figures 1-3 , the pipe body includes a head segment 1, an intermediate segment 2 and a tail segment 3 along the axial direction. As shown in Figure 1 and Figure 4 , the head segment 1 includes at least two expansion arms 11 arranged in parallel along the axial direction.

[0033] As shown in Figures 1-3 , the intermediate segment 2 is provided with a deformation groove 24 penetrating the pipe body along the radial direction, the deformation groove 24 divides the pipe body into two parallel and opposite expansion arms 25, the inner side of the expansion arm 25 is recessed inward, and a deformation guide line is formed at the recessed part, the deformation guide line is perpendicular to the axis of the pipe body.

[0034] Specifically, as shown in Figures 1-3 , the recessed area of each expansion arm 25 is V-shaped, and the recessed areas of the two expansion arms 25 are symmetrically distributed left and right, and together enclose a deformation groove 24 with a rhombus cross section. The V-shaped bottom of the recessed area is the deformation guide line.

[0035] When the thickness of the base used is large, after the expansion pipe is inserted into the base hole, the pipe body is completely placed in the base hole, and when the screw is completely screwed in, the expansion arm 11 of the head segment 1 expands outward and is pressed against the hole wall of the base hole, realizing the connection between the expansion pipe and the base. At the same time, the intermediate segment also expands outward to a certain extent, playing an auxiliary connection role.

[0036] When the thickness of the base used is small, the base hole is a through hole, after the expansion pipe is inserted into the base hole, the intermediate segment 2 passes through the base hole and extends out, when the screw is screwed into the head segment 1, the head segment 1 will move towards the tail segment 3 direction, accompanied by the screwing of the screw, the expansion arm 25 will bend outward with the deformation guide line as the inflection point, preventing the expansion pipe from exiting from the base hole, and then realizing the connection between the expansion pipe and the base, that is, as shown in Figure 5 .

[0037] Specifically, as shown in Figure 1 and Figure 2As shown, the side surface of the intermediate segment 2 is inwardly recessed to form a weakening area 21, the number of weakening areas 21 is two, and they correspond to the openings of the deformation grooves 24. The weakening area 21 can weaken the strength of the expansion arm 25, and when used for a small-thickness base, the expansion arm 25 can more easily enter the bent deformation state.

[0038] Specifically, as shown in Figure 1 and Figure 2 As shown, the outer side surface of the intermediate segment 2 is distributed with friction grooves or friction ribs. When used for a large-thickness base, the arrangement of the friction grooves or friction ribs can increase the friction between the intermediate segment 2 and the base hole, and to some extent, enhance the connection reliability.

[0039] Further, as shown in Figures 1-3 As shown, the outer side of the expansion arm 25 is connected with an auxiliary support arm 22, which is arranged in the inner and outer corresponding to the deformation guide line. The end of the auxiliary support arm 22 corresponding to the head segment 1 is fixedly arranged. In the deformed state of the pipe body, the end of the auxiliary support arm 22 corresponding to the tail segment 3 is outwardly expanded.

[0040] When used for a small-thickness base, after the expansion arm 25 is outwardly bent and deformed, the auxiliary support arm 22 is also outwardly expanded, increasing the outward expansion distance of the expansion arm 25, so as to improve the force to prevent the pipe body from exiting the base hole, and enhance the connection reliability.

[0041] Specifically, as shown in Figures 1-3 As shown, the outer side surface of the expansion arm 25 is provided with a containing groove, and the auxiliary support arm 22 is partially or wholly embedded in the containing groove. By arranging the containing groove, the auxiliary support arm 22 can be stored, reducing the resistance of the pipe body inserted into the base hole, and at the same time, the containing groove can weaken the expansion arm 25, so that the expansion arm 25 can more easily enter the bent state.

[0042] The outer side surface of the tail end segment of the pipe body is provided with a plurality of rib plates 32, which extend along the axial direction of the pipe body and are annularly and uniformly distributed around the axis of the pipe body. The rib plate 32 can well cooperate with the base to avoid the expansion pipe from rotating during the screw rotation, and to ensure the smooth connection operation. The tail end segment of the pipe body is provided with an annular stop ring 31, which can axially position the insertion of the pipe body.

[0043] Further, as shown in Figures 1-3 As shown, the outer side surface of the intermediate segment 2 is provided with a guide groove 23, which corresponds to the expansion arm 25, and is located between the intermediate segment 2 and the tail segment 3. The arrangement of the guide groove 23 can guide the deformation of the expansion arm 25 at a specific position, so as to better limit the applicable base thickness. Specifically, the length of the guide groove 23 from the tail end of the pipe body is the applicable base thickness.

[0044] The inflation tube of the application can be deformed in different forms for base parts of different thicknesses, well adapts to base parts of various thicknesses, and guarantees the reliability of the connection.

[0045] In summary, the above only describes the preferred embodiments of the present application, and is not used to limit the present application, and any modification, equivalent replacement and improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An inflatable tube comprising a tube body, said tube body having an inflation channel formed therein; characterized by: The pipe body comprises a head section, a middle section and a tail section in sequence along the axial direction; the head section comprises at least two expansion arms arranged in parallel along the axial direction; The middle section is provided with a deformation groove penetrating the pipe body along the radial direction; the deformation groove divides the pipe body into two expansion arms arranged in parallel; the inner side of the expansion arm is concave inwardly and forms a deformation guide line at the concave position; the deformation guide line is perpendicular to the axial line of the pipe body.

2. The expanded tubular of claim 1, wherein: The cross section of the deformation groove is in the shape of a rhombus.

3. The expanded tubular of claim 1, wherein: The side surface of the middle section is concave inwardly to form a weakened area; the number of the weakened areas is two and corresponds to the openings of the deformation grooves one by one.

4. The expanded tubular of claim 1, wherein: The outer side surface of the middle section is provided with a guide groove corresponding to the expansion arm one by one; the guide groove is located between the middle section and the tail section.

5. The expanded tubular of claim 1, wherein: The outer side surface of the middle section is provided with a friction groove or a friction convex rib.

6. The expanded tubular of claim 1, wherein: The outer side surface of the tail section of the pipe body is provided with a plurality of rib plates; the rib plates extend along the axial direction of the pipe body and are annularly and uniformly distributed around the axial line of the pipe body.

7. The expanded tubular of claim 1, wherein: The tail section of the pipe body is provided with an annular retaining ring.

8. The expanded tube of any of claims 1-7, wherein: The outer side of the expansion arm is connected with an auxiliary support arm; the auxiliary support arm is arranged inside and outside the deformation guide line one by one; one end of the auxiliary support arm corresponding to the head section is fixed; in the deformed state of the pipe body, one end of the auxiliary support arm corresponding to the tail section is expanded outwardly.

9. The expanded tubular of claim 8, wherein: The outer side surface of the expansion arm is provided with a containing groove; the auxiliary support arm is partially or wholly embedded in the containing groove.

10. An expansion bolt comprising an expansion tube and a screw, characterized by: The expansion tube is the expansion tube according to any one of claims 1-9.

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