Tool and method for taking out large-diameter broken bolt

Abstract

The invention discloses a tool for taking out a large-diameter broken bolt, which is characterized by consisting of a tool bit, a connecting part and a driving handle, the tool bit is composed of four cutting edges and connected with the driving handle through a connecting part. And the driving handle is hexagonal. The broken bolt can be rapidly and safely taken out on line, and the device has the advantages of being wide in application range, simple in structure, safe, reliable, easy to operate, high in practicability and the like.

Description

Technical Field

[0001] The present invention relates to the field of removing broken bolts with large diameters, and in particular to a tool for removing broken bolts with large diameters and a method for removing the same. Background Art

[0002] During on-site equipment maintenance, it is common to encounter bolts that cannot be tightened or break during disassembly, especially bolts with a countersunk head installed on one end. Once a broken bolt occurs on-site, the traditional method of removing the broken bolt has problems such as inconvenient operation, low efficiency, and easy damage to the parent thread. Therefore, it is necessary to develop a new method for online removal of large-diameter broken bolts. The traditional method of removing broken bolts is to weld a nut to the end face of the broken bolt, use a wrench and hammer to forcefully hit the nut to drive the broken bolt to rotate and remove the broken bolt. Because the broken bolt is rusted or the thread is stuck, it is difficult to remove it using a transmission method, and it is easy to damage the broken bolt and the parent thread. Summary of the Invention

[0003] To solve the above problems, the first aspect of the present invention provides a large-diameter broken bolt removal tool, which consists of a cutter head, a connecting part and a driving handle; the cutter head consists of 4 blades, and the cutter head is connected to the driving handle through the connecting part; the driving handle is hexagonal.

[0004] According to another aspect of the present invention, a method for removing a broken bolt with a large diameter is provided, comprising the following steps: The first step is to use gas welding or a grinder to shorten the protruding part of the broken bolt as close to the equipment body as possible, and then grind the cut surface smooth; The second step is to drill a hole on the end face of the broken bolt and drill a plum blossom hole inside the broken bolt to facilitate the subsequent installation of the broken bolt removal tool; The third step is to manufacture an extraction tool. Using a wrench, the tool is then used to remove the broken bolt. The broken bolt is hollowed out, allowing it to deform when stressed. This allows for easy removal without damaging the threads of the device. The extraction tool can be customized to the size of the broken bolt and the number of square holes, allowing a single extraction tool to be used for any bolt size.

[0005] Furthermore, when drilling a hole in the end face of a broken bolt, first drill a hole in the center of the end face of the broken bolt, then insert a pin in the hole, and then drill holes around it. When drilling holes around it, after drilling the first hole, drill the second hole on the opposite side, and then drill both sides. After all four holes are drilled, pull out the pin.

[0006] Furthermore, the pin is first threaded at the center of the tail before being fitted, and when being taken out, the pin is pulled out using a hammer using the thread at the center of the tail of the pin.

[0007] The patented invention can quickly and safely remove broken bolts online, and has the characteristics of wide application range, simple structure, safety and reliability, easy operation, and high practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is a schematic diagram of the structure of a tool for removing broken bolts with large diameters; Figure 2 This is a schematic diagram of the cutter head structure of a tool for removing broken bolts with a large diameter; Figure 3 This is a schematic diagram of the shortening position of a broken bolt for removing a large diameter broken bolt; Figure 4 This is a schematic diagram of a method for removing a broken bolt of a large diameter after it has been cut short; Figure 5 This is a schematic diagram of the installation of the removal tool for removing a broken bolt with a large diameter; Figure 6 This is a schematic diagram of the end face drilling method for removing a broken bolt with a large diameter; Figure 7 This is a diagram of the removal process for removing a broken bolt with a large diameter; Figure 8 This is a picture of the interrupted bolt in the embodiment; Figure 9 Schematic diagram of four square plum blossom holes drilled in the middle of the bolt in the embodiment; Figure 10 2. It is a schematic diagram of the structure of the removal tool in the embodiment; Figure 11 1. It is a picture of the removal tool and the removed broken bolt in the embodiment.

[0009] Reference numerals: 1: Cutter head; 2: Connecting part; 3: Drive handle; 4: Inner hole; 5: Equipment body; 6: Broken bolt; 7: Removal position; 8: Tool removal; 9: Center hole; 10: First hole around the perimeter; 11: Second hole around the perimeter; 12: Third hole around the perimeter; 13: Fourth hole around the perimeter. DETAILED DESCRIPTION

[0010] To make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessary confusion of the concepts of the present invention.

[0011] like Figure 1 and Figure 2The figure shows a large-diameter broken bolt removal tool, which consists of a cutter head 1, a connecting part 2 and a driving handle 3; the cutter head 1 consists of four cutting edges, and the cutter head 1 is connected to the driving handle 3 through the connecting part 2; the driving handle 3 is hexagonal.

[0012] According to another aspect of the present invention, a method for removing a broken bolt with a large diameter is provided, comprising the following steps: The first step, such as Figure 3 As shown, use gas welding or a grinder to shorten the protruding part of the broken bolt as close to the equipment body as possible. Figure 4 As shown, the cut surface is then ground smooth; The second step is to drill a hole on the end face of the broken bolt and drill a plum blossom hole inside the broken bolt to facilitate the subsequent installation of the broken bolt removal tool; The third step is to process and make the removal tools, such as Figure 5 Install the broken bolt extraction tool as shown, then use a wrench to twist the tool and remove the broken bolt. The broken bolt is hollowed out, allowing it to deform when stressed, making it easy to remove without damaging the threads of the device. The extraction tool can be customized to the size of the broken bolt and the number of square holes, allowing one tool to be used for any bolt size.

[0013] like Figure 6 As shown, when drilling a hole in the end face of a broken bolt, first drill a center hole 8 in the center of the end face of the broken bolt, then insert a pin in the hole, and then drill holes around it. When drilling around it, after drilling the first hole 9, drill the second hole 10 on the opposite side, and then drill holes 11 and 12 on both sides. After the four holes are drilled, pull out the pin.

[0014] like Figure 7 As shown, the pin is tapped at the center of the tail before being inserted, and when taking it out, the pin is pulled out using a hammer using the thread at the center of the pin tail.

[0015] Example 1: Take one Figure 8 The following is the online removal method of the broken M60 countersunk bolt: Step 1: Use gas welding or a grinder to cut the protruding part as short as possible to the device body, and then grind the cut surface smooth.

[0016] Step 2: Drill 4 square plum blossom holes in the middle of the bolt, such as Figure 9 As shown, since the bottom hole size of the M60 bolt thread is 54, in order not to damage the parent thread, the outer circle size of the plum blossom hole cannot exceed 52 when drilling. It is chosen to drill 4 φ26 holes. After the first hole is drilled, there is a gap when drilling the second hole. In order to avoid drilling deviation, the pin is processed and inserted after drilling one hole. After the 4 holes are drilled, the pin is pulled out.

[0017] Step 3: Process and make special removal tools such as Figure 10 As shown, then use a wrench to remove the tool. Since the broken bolt has been drilled through, the bolt will deform when subjected to force, as shown in the following example. Figure 11 As shown, the broken bolt can be easily removed without damaging the parent thread. The extraction tool can be made according to the size of the broken bolt and the number of square holes. One extraction tool can be used for bolts of the same specification.

[0018] It should be understood that the above-described specific embodiments of the present invention are merely illustrative or illustrative of the principles of the present invention and do not constitute limitations of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention should be included within the scope of protection of the present invention. In addition, the appended claims are intended to cover all variations and modifications that fall within the scope and metes and bounds of the appended claims, or equivalents thereof.

Claims

1. A tool for removing broken bolts with a large diameter, characterized in that: It consists of a cutter head, a connecting part and a driving handle; the cutter head consists of 4 blades, and the cutter head is connected to the driving handle through the connecting part; the driving handle is hexagonal.

2. A method for removing a broken bolt with a large diameter, characterized in that: The following steps are involved: The first step is to use gas welding or a grinder to shorten the protruding part of the broken bolt as close to the equipment body as possible, and then grind the cut surface smooth; The second step is to drill a hole on the end face of the broken bolt and drill a plum blossom hole inside the broken bolt to facilitate the subsequent installation of the broken bolt removal tool; The third step is to process and manufacture the removal tool, then use a wrench to turn the removal tool and remove the broken bolt.

3. The method for removing a broken bolt with a large diameter according to claim 2, characterized in that: When drilling a hole in the end face of a broken bolt, first drill a hole in the center of the end face of the broken bolt, then insert a pin in the hole, and then drill holes around it. When drilling holes around it, after drilling the first hole, drill the second hole on the opposite side, and then drill both sides. After all four holes are drilled, pull out the pin.

4. The method for removing a broken bolt with a large diameter according to claim 3, characterized in that: The pin is first threaded at the center of the tail before being fitted, and when being taken out, the pin is pulled out using a hammer using the threaded hole at the center of the tail of the pin.

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