Reusable fixing bolt

Abstract

A reusable fixing bolt comprises a bolt body and a nut, the peripheral face of the bolt body is sleeved with a lower pipeline and an upper pipeline, the length of the bolt body is larger than the sum of the lengths of the upper pipeline and the lower pipeline, one end of the lower pipeline is a lower inclined section, and the end, close to the lower pipeline, of the upper pipeline is an upper inclined section. The lower inclined section and the upper inclined section are parallel to each other and attached to each other. The expansion bolt has high stability, the fixing effect is enhanced through the mortise and tenon joint structure, and compared with a traditional expansion bolt, the performance is greatly improved. And the device can be used on equipment with relatively strong oscillation property.

Description

Technical Field

[0001] The utility model relates to a bolt, in particular to a reusable fixing bolt. Background Art

[0002] Fixing bolts are mainly used to fix some small and medium-sized equipment in mines. Since the use location is mainly underground, most of the time they are used in hard limestone. Therefore, anchor bolts cannot be used to fix the equipment. The main reason is that underground transportation is inconvenient and cast-in-place anchor bolts cannot be used. In addition, the rock is hard and the installation cost of detachable anchor bolts is high. Therefore, disposable expansion bolts are currently used to fix the equipment. However, there are the following problems when fixing the equipment:

[0003] 1. The equipment used for fixing is mainly small and medium-sized equipment, which needs to be changed every once in a while during use. Therefore, a large number of disposable bolts are used, which is costly. Often in one mining operation, the installation position of the equipment needs to be changed three to four times. Based on the calculation that 4 expansion bolts are used each time, a total of more than 12 expansion bolts are needed to install and fix the equipment.

[0004] 2. After the expansion bolt is driven into the hole on the ground or wall, tighten the nut on the expansion bolt with a wrench. The bolt moves outward, but the metal sleeve outside does not move. Therefore, the big head under the bolt expands the metal sleeve to fill the entire hole. At this time, the expansion bolt cannot be pulled out. However, its fixation is not very reliable. If the load has a large vibration, it may become loose. The equipment commonly used in mining equipment has a large vibration, so the use of expansion bolts cannot stably fix equipment with large vibration. Utility Model Content

[0005] The technical problem to be solved by the utility model is to overcome the defects of the prior art that the expansion bolts used to fix mining equipment are large in quantity and high in cost, the expansion bolts have low fixing reliability during vibration, and may become loose, and to provide a reusable fixing bolt that can save the cost of equipment installation and fixing, has strong stability and reliability, and has a simple structure and is easy to operate.

[0006] The utility model adopts a technical solution to solve its technical problem, which is a reusable fixing bolt, comprising a bolt and a nut, wherein the outer circumferential surface of the bolt is sleeved with a lower pipe and an upper pipe, and the length of the bolt is greater than the sum of the lengths of the upper pipe and the lower pipe, one end of the lower pipe is a downward inclined section, and the end of the upper pipe close to the lower pipe is an upward inclined section, and the lower inclined section and the upper inclined section are parallel to each other and fit each other.

[0007] Furthermore, the inner pipe wall of the lower pipe has threads and can be threadedly connected with bolts, and the diameter of the inner pipe of the upper pipe is larger than the diameter of the bolts.

[0008] Furthermore, the inclination angle of the downward inclined section or the upward inclined section is 30°, 45° or 60°, and the inclination angles of the downward inclined section and the upward inclined section are the same.

[0009] The utility model has the following beneficial technical effects:

[0010] 1. The structure is simple and easy to operate. When in use, you only need to tighten the bolts and nuts to fix the equipment. When disassembling, loosen the bolts, shake them left and right to return the upper and lower pipes to their original positions, and then pull them out; 2. Save installation and fixing costs. Compared with the use of disposable expansion bolts, the utility model completes the recycling and reuse of bolts through a simple detachable design. Therefore, the use of this bolt can greatly save mining costs and increase mine profits; 3. It has strong stability, and the mortise and tenon structure is used to enhance the fixing effect. It is improved on the basis of traditional expansion bolts (fixed only by the friction between the outer wall and the rock), and can be used to fix equipment with strong vibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the overall structure of an embodiment of a reusable fixing bolt of the utility model;

[0012] Figure 2 This is a schematic diagram of the lower pipeline structure of an embodiment of the reusable fixing bolt of the utility model;

[0013] Figure 3 It is a schematic diagram of the bolt structure of an embodiment of a reusable fixing bolt of the utility model;

[0014] Figure 4 This is a schematic diagram of the upper pipeline structure of an embodiment of a reusable fixing bolt of the utility model;

[0015] Figure 5 The utility model is a fixing effect diagram of a reusable fixing bolt embodiment of the utility model in a solid rock.

[0016] Description of reference numerals:

[0017] 1. Lower pipe; 2. Upper pipe; 3. Bolt; 4. Gasket; 5. First layer nut; 6. Second layer nut; 7. Thread; 8. Rock. DETAILED DESCRIPTION

[0018] The utility model is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0019] Reference Figure 1~Figure 5This embodiment includes a lower pipe 1, an upper pipe 2, a bolt 3, a gasket 4, a first layer of nuts 5, and a second layer of nuts 6. The first layer of nuts 5, the second layer of nuts 6, the gasket 4, the upper pipe 2, and the lower pipe 1 are sequentially sleeved on the bolt 3.

[0020] The length of the bolt 3 is greater than the sum of the lengths of the upper pipe 2 and the lower pipe 1. The end of the lower pipe 1 close to the upper pipe 2 is a downward inclined section with an inclination angle of 45° (not marked in the figure), and the end of the upper pipe 2 close to the lower pipe 1 is an upward inclined section with an inclination angle of 45° (not marked in the figure). The downward inclined section and the upward inclined section are parallel to each other and fit each other.

[0021] The inner wall of the lower pipe 1 has threads and can be threadedly connected with the bolts 3 , and the diameter of the inner pipe of the upper pipe 2 is greater than the diameter of the bolts 3 .

[0022] In this embodiment, the bolt 3 is 35 cm long, has a hexagonal top, is inscribed in a circle with a radius of 1 cm, has threads on the whole, a thread pitch of 1 mm, a diameter of 20 mm, is forged from medium carbon steel, and has a mechanical property grade of 6.8.

[0023] The lower pipe 1 is 15 cm long and 60 mm in diameter, with threads of 20 mm in diameter and 1 mm in pitch processed inside. The lower pipe 1 is hollow cylindrical as a whole, with a 45° inclined section at the top.

[0024] The upper pipe 2 is 15 cm long and 60 mm in diameter, with a hollow channel of 42 mm in diameter processed inside and a 45° inclined section at the bottom.

[0025] The utility model is mainly used for the installation and fixation of mining equipment with strong vibration. Workers use portable rock drills to drill a cylindrical hole with a length of 30 cm and a diameter of 6 cm on the rock wall, and put the bolt 3 vertically. During the installation process, it is necessary to pay attention to the upper pipe 2 and the lower pipe 1 section to keep in close contact. The rotation of the bolt 3 makes the lower pipe 1 obtain a rotating and rising torsion. At this time, the oblique section of the lower pipe 1 has a torsion on the oblique section of the upper pipe 2, which can be decomposed into vertical and horizontal forces. Under the action of these two forces, the upper pipe 2 and the lower pipe 1 are dislocated, and the two ends are embedded in the rock wall. After the bolt 3 is tightened, a layer of nut 5 is tightened again to squeeze the upper pipe, provide it with a downward pressure, and form an extrusion resistance force at the oblique section, so that the right wall of the upper pipe 2 is completely embedded in the rock wall, and the left wall of the lower pipe 1 is completely embedded in the rock wall to form a simple mortise and tenon structure to enhance stability. The right wall of the upper pipe 2 and the left wall of the lower pipe 1 are in close contact with the rock wall under the horizontal force, which greatly enhances the friction. Then pass the bolt 3 through the fixing hole of the device to be fixed, place it on the first layer of nut 5, and then tighten the second layer of nut 6 to fix the device. After use, loosen the bolt 3, the first layer of nut 5, and the second layer of nut 6 used to fix the device to release the pressure, then tap the bolt left and right to reset the lower pipe 1 and the upper pipe 2, and finally gently pull it out for reuse.

[0026] The implementation principle of a reusable fixing bolt in the embodiment of the utility model is as follows:

[0027] When the bolt 3 begins to be tightened, a mutual extrusion force will be formed at the oblique section of the lower pipe 1 and the upper pipe 2, causing the upper pipe 2 to be offset from the lower pipe 1, and the right wall of the upper pipe 2 and the left wall of the lower pipe 1 to squeeze and rub against the rock wall. When the bolt 3 is completely tightened, tightening another layer of nut 5 will squeeze the upper pipe 2, causing the oblique section of the upper pipe 2 and the lower pipe 1 to be completely embedded in the rock wall, forming a mortise and tenon structure to strengthen stability. When disassembling, you only need to loosen the bolt 3, a layer of nut 5, and the second layer of nut 6 used to fix the equipment, release the internal pressure, knock the bolt 3, reset the lower pipe 1 and the upper pipe 2, and then pull them out for reuse.

[0028] The above are preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A reusable fixing bolt, comprising a bolt (3) and a nut, characterized in that: The outer circumferential surface of the bolt (3) is sleeved with a layer of nuts (5), a second layer of nuts (6), a lower pipe (1) and an upper pipe (2); the length of the bolt (3) is greater than the sum of the lengths of the upper pipe (2) and the lower pipe (1); one end of the lower pipe (1) is a downwardly inclined section; the end of the upper pipe (2) close to the lower pipe (1) is an upwardly inclined section; the downwardly inclined section and the upwardly inclined section are parallel to and fit each other; the inner wall of the lower pipe (1) has threads and can be threadedly connected to the bolt (3); the diameter of the inner pipe of the upper pipe (2) is greater than the diameter of the bolt (3); the inclination angle of the downwardly inclined section or the upwardly inclined section is 30°, 45° or 60°, and the inclination angles of the downwardly inclined section and the upwardly inclined section are the same.

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