Expansion bolt with good fastening effect

Abstract

The utility model relates to the technical field of expansion bolts, in particular to an expansion bolt with a good fastening effect. The device comprises a screw, a sleeve, a taper sleeve, a flat gasket, a spring gasket and a nut in threaded connection with the screw are sequentially arranged on the screw, a conical head is arranged at the end, away from the nut, of the screw, a plurality of open grooves are formed in the two ends of the sleeve, and the conical head and the small end of the taper sleeve are oppositely arranged and can be inserted into the sleeve. Limiting clamping grooves are formed in the end faces, located between every two adjacent open grooves, of the two ends of the sleeve, limiting protrusions capable of being correspondingly clamped into the limiting clamping grooves are arranged on the sides, close to the limiting clamping grooves, of the conical head and the conical sleeve, and locking protrusions are arranged on the circumferential side face, located between every two adjacent open grooves, of the sleeve. After the prior art is improved, the screw rod and the expansion sleeve are not easy to rotate along with each other in the disassembly and assembly process, so that the disassembly and assembly operation is relatively easy, and the fastening effect of the whole structure after installation is good.

Description

Technical Field

[0001] The utility model relates to the technical field of expansion bolts, in particular to an expansion bolt with good fastening effect. Background Art

[0002] As an important mechanical fastener, expansion bolts are widely used in many fields such as construction, machinery, electric power, automotive and aviation industries. Its unique expansion fixing mechanism enables expansion bolts to achieve firm connection and fixation in various solid materials (such as concrete, stone, bricks, etc.).

[0003] For example, a Chinese patent document with the authorization number CN220531360U discloses a tapered sleeve type bidirectional expansion bolt, which includes a sleeve. An inner end opening groove is provided at the lower end of the sleeve. A countersunk head bolt is movably connected inside the sleeve. A flat washer, a spring washer and a hexagonal nut are movably connected to the upper end of the countersunk head bolt in sequence from bottom to top. An outer end opening groove is provided at the upper end of the sleeve and the outer end opening groove has the same size as the inner end opening groove. The lower end of the countersunk head bolt is a conical surface structure. A tapered sleeve is movably connected to the upper end of the sleeve. The tapered sleeve is arranged at the lower end of the flat washer and the tapered sleeve is a hollow inverted conical surface structure. For this tapered sleeve type bidirectional expansion bolt, opening grooves are provided at both the upper and lower ends of the sleeve, and a tapered sleeve is provided at the upper end of the sleeve. When the device receives an axial force from the outside towards the inside of the device, the tapered sleeve will tighten the inner end of the sleeve, thereby preventing the axial movement of the device; on the basis of maintaining the original traditional inner end axial force, bidirectional stopping is achieved. After the expansion screw is installed, the stability of the expansion screw when fixing objects and connecting bodies can be effectively guaranteed; however, during the process of screwing the nut during installation or disassembly, the sleeve will rotate with the screw, the overall stability is poor, and the installation is relatively time-consuming and laborious.

[0004] Therefore, it is necessary to improve the deficiencies of the above prior art. Summary of the Invention

[0005] The technical problem to be solved by the utility model is to provide an expansion bolt with good fastening effect in view of the deficiencies of the above prior art, and solve the problems that during installation or disassembly, the sleeve will rotate with the screw, the overall stability is poor, and the installation is relatively time-consuming and laborious in the prior art.

[0006] To achieve the above object, the utility model provides the following technical solution: an expansion bolt with good fastening effect, including a screw rod, on which a sleeve, a tapered sleeve, a flat washer, a spring washer and a nut threadedly connected to the screw rod are successively arranged. A tapered head is arranged at one end of the screw rod away from the nut. A plurality of opening slots are arranged at both ends of the sleeve. The tapered head and the small head end of the tapered sleeve face each other and can be inserted into the sleeve. Limiting card slots are arranged on the end faces of the two ends of the sleeve at the middle positions between adjacent two opening slots. Limiting protrusions capable of correspondingly being clamped into the limiting card slots are arranged on the tapered head and the tapered sleeve close to the limiting card slots. A stop protrusion is arranged on the circumferential side surface of the sleeve between adjacent two opening slots.

[0007] With the above technical solution, when installing the expansion bolt, the screw rod and the sleeve can be first inserted into the installation hole and then the screw rod is pulled outwards. The tapered head of the screw rod abuts against the sleeve to make the limiting protrusions respectively clamped into the limiting card slots. Then the tapered sleeve is sleeved on the screw rod and also makes the limiting protrusions respectively clamped into the limiting card slots. Then the flat washer, the spring washer and the nut are installed in sequence. When the nut gradually shortens the distance from the tapered head and makes the tapered head and the tapered sleeve simultaneously squeeze and expand from both ends of the sleeve to make it expand outwards and abut against the inner wall of the installation hole tightly, the stop protrusion is pressed into the inner wall of the installation hole to limit the sleeve so that the sleeve is not easy to rotate. During the process of screwing the nut, since the limiting protrusions of the tapered head and the tapered sleeve are clamped into the limiting card slots on the sleeve, the screw rod and the sleeve are relatively fixed with respect to the installation hole and are not easy to rotate together, making the disassembly and assembly operations relatively easy and the overall structure having a good fastening effect after installation; similarly, when it is necessary to disassemble the expansion bolt, reverse operation can be carried out.

[0008] The further setting of the above technical solution is: limiting protrusions are also correspondingly arranged at the corresponding positions of the opening slots.

[0009] With the above technical solution, the limiting protrusions corresponding to the opening slots can be clamped into the opening slots, further improving the stability. In addition, it can also abut against the opening slots to make the sleeve expand and separate, sharing part of the acting force and making the force more uniform.

[0010] The further setting of the above technical solution is: the stop protrusion is in a folded angle shape and is arranged in a plurality of layers overlapping axially.

[0011] With the above technical solution, a plurality of folded angle-shaped stop protrusions can make the sleeve be clamped into the inner wall of the installation hole after expansion, further improving the stability.

[0012] The further setting of the above technical solution is: the limiting card slot is set to be semi-circular arc-shaped, and the two sides of the limiting protrusion are provided with arc-shaped transition arc surfaces.

[0013] With the above technical solution, the transition arc surfaces on both sides of the limiting protrusion cooperate with the semi-circular arc-shaped limiting card slot, making the limiting protrusion be able to be clamped into the limiting card slot more smoothly.

[0014] A further setting of the above technical solution is that an expansion round hole is communicated with one end of the opening groove close to the middle of the sleeve.

[0015] By adopting the above technical solution, the expansion round hole can prevent the opening groove from being torn when it expands.

[0016] A further setting of the above technical solution is that a plurality of spiral chip guide grooves are further arranged on the side surface of the middle part of the sleeve.

[0017] By adopting the above technical solution, the arrangement of the chip guide grooves can accommodate powder and debris, which is convenient for the sleeve to extend into the installation hole.

[0018] The beneficial effects achieved by the present utility model are as follows: during the disassembly and assembly process, neither the screw nor the expansion sleeve is prone to follow-up rotation, making the disassembly and assembly operations relatively easy, and the overall structure has a good fastening effect after installation. Description of the Drawings

[0019] Figure 1 It is a schematic structural diagram of an embodiment of the present utility model;

[0020] Figure 2 It is an exploded structural diagram of an embodiment of the present utility model;

[0021] Figure 3 It is a schematic structural diagram of the sleeve in an embodiment of the present utility model. Detailed Embodiments

[0022] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0023] Such as Figures 1-3As shown in the figure, an expansion bolt with good fastening effect includes a screw rod 1. A sleeve 2, a tapered sleeve 3, a flat washer 4, a spring washer 5, and a nut 6 threadedly connected to the screw rod 1 are successively arranged on the screw rod 1. A tapered head 7 is arranged at one end of the screw rod 1 away from the nut 6. A plurality of opening grooves 20 are arranged at both ends of the sleeve 2. The tapered head 7 and the small head end of the tapered sleeve 3 face each other and can be inserted into the sleeve 2. Limiting card slots 21 are arranged on the end faces of both ends of the sleeve 2 at the middle positions between adjacent two opening grooves 20. Limiting protrusions 8 that can correspondingly be clamped into the limiting card slots 21 are arranged on both sides of the tapered head 7 and the tapered sleeve 3 close to the limiting card slots 21. A stop protrusion 22 is arranged on the circumferential side surface of the sleeve 2 between adjacent two opening grooves 20. Limiting protrusions 8 are also correspondingly arranged at the corresponding positions of the opening grooves 20. The stop protrusion 22 is in a folded angle shape and is arranged in multiple layers axially overlapping for two or more. The limiting card slot 21 is arranged in a semi-circular arc shape. Both sides of the limiting protrusion 8 are arranged as arc-shaped transition arc surfaces. An expansion round hole 23 is communicated with one end of the opening groove 20 close to the middle of the sleeve 2. A plurality of spiral chip guiding grooves 24 are also arranged on the side surface of the middle part of the sleeve 2.

[0024] In the above embodiment, when installing the expansion bolt, the screw rod 1 and the sleeve 2 can be first inserted into the installation hole and then the screw rod 1 is pulled outwards. The tapered head 7 of the screw rod 1 abuts against the sleeve 2 to make the limiting protrusions 8 respectively clamped into the limiting card slots 21. Then the tapered sleeve 3 is sleeved on the screw rod 1 and also makes the limiting protrusions 8 respectively clamped into the limiting card slots 21. Then the flat washer 4, the spring washer 5, and the nut 6 are successively installed. When the nut 6 gradually shortens the distance from the tapered head 7 and makes the tapered head 7 and the tapered sleeve 3 simultaneously squeeze and expand from both ends of the sleeve 2 to make it expand outwards and abut against the inner wall of the installation hole tightly, the stop protrusion 22 is pressed into the inner wall of the installation hole to limit the sleeve 2 so that the sleeve 2 is not easy to rotate. During the process of screwing the nut 6, because the limiting protrusions 8 of the tapered head 7 and the tapered sleeve 3 are clamped into the limiting card slots 21 on the sleeve 2, the screw rod 1 and the sleeve 2 are both relatively fixed with respect to the installation hole (i.e., the connecting body) and are not easy to rotate together, making the disassembly and assembly operations relatively easy and the overall structure having a good fastening effect after installation; similarly, when it is necessary to disassemble the expansion bolt, reverse the operation.

Claims

1. An expansion bolt with good fastening effect, comprising a screw rod, on which a sleeve, a tapered sleeve, a flat washer, a spring washer and a nut threadedly connected to the screw rod are successively arranged. A tapered head is arranged at one end of the screw rod away from the nut. A plurality of opening grooves are arranged at both ends of the sleeve. The tapered head and the small head end of the tapered sleeve face each other and can be inserted into the sleeve. It is characterized in that: On the end faces of both ends of the sleeve, which are located in the middle positions between two adjacent opening grooves, there are provided limit card slots. On the sides of the tapered head and the tapered sleeve close to the limit card slots, there are provided limit protrusions that can be correspondingly inserted into the limit card slots. On the circumferential side surface of the sleeve between two adjacent opening grooves, there is provided a stop protrusion.

2. The expansion bolt with good fastening effect according to claim 1, wherein: Limit protrusions are also correspondingly provided at the corresponding positions of the opening grooves.

3. The expansion bolt with good fastening effect according to claim 2, characterized in that: The stop protrusion is in a folded angle shape and is arranged in multiple layers along the axial direction as several pieces.

4. The expansion bolt with good fastening effect according to claim 3, wherein: The limit card slot is set to be semi-circular arc-shaped, and both sides of the limit protrusion are provided with arc-shaped transition arc surfaces.

5. The expansion bolt with good fastening effect according to claim 4, wherein: One end of the opening groove close to the middle of the sleeve is communicated with an expansion round hole.

6. The expansion bolt with good fastening effect according to claim 5, characterized in that: On the side surface of the middle part of the sleeve, there are also provided several spiral chip guide grooves.

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