A large-diameter bolt tapping device

Abstract

The utility model belongs to tapping equipment technical field discloses a large diameter bolt tapping equipment, including the screw cap that is engaged with the large diameter bolt, the screw cap top is equipped with the twist gap, the screw cap side surface is equipped with the mounting block, the mounting block is equipped with alloy cutter, alloy cutter's contact end contacts in the thread groove of large diameter bolt, adopts the structure design of the utility model, can realize the tapping of the thread damage place of large diameter bolt through the screw cap, to this guarantees the continued use of large diameter bolt, after tapping is completed, continues to rotate the screw cap to realize the inspection to the thread of large diameter bolt that tapping is repaired, to this to guarantee the qualified and normal use after tapping is completed.

Description

Technical Field

[0001] This utility model belongs to the technical field of tapping equipment, specifically relating to a tapping device for large-diameter bolts. Background Technology

[0002] During the overhaul of the turbine body and main steam valve control valve, the large-diameter high-temperature and high-pressure bolts used in their assembly are made of special alloy material and operate under high-temperature conditions for extended periods. This can lead to metal adhesion or changes in material properties at the mating surfaces of the bolts and nuts. During disassembly, the threads of the valve stem and nut often become damaged, deformed, or even jammed, rendering the bolts unusable.

[0003] Currently, there is a lack of suitable large-diameter tapping dies and specialized tapping equipment for repairing the threads of such large-diameter bolts. Conventional small tapping tools cannot meet the size and strength requirements of large-diameter bolts, and replacing the bolts with new ones would significantly increase maintenance costs and time. Therefore, there is an urgent need for a tapping tool that can be quickly adapted to large-diameter bolts and can be made using existing components to solve the problem of bolt thread repair in the absence of large-diameter tapping equipment. Utility Model Content

[0004] In view of the problems mentioned above in the background technology, the purpose of this utility model is to provide a large-diameter bolt tapping device.

[0005] To achieve the above-mentioned technical objectives, the technical solution adopted by this utility model is as follows: A large-diameter bolt tapping device includes a nut that meshes with the large-diameter bolt. The top of the nut has a turning notch, and a mounting block is mounted on the side of the nut. An alloy cutter is mounted on the mounting block, and the contact end of the alloy cutter contacts the thread groove of the large-diameter bolt.

[0006] Furthermore, the mounting block has an arc surface that matches the shape of the nut, and the mounting block is fixedly installed on the nut by welding. This design increases the contact area between the mounting block and the nut, thereby enhancing the connection strength between the two. Welding has good load-bearing capacity and high strength. Furthermore, screws can be used for fixed installation as needed.

[0007] Furthermore, the mounting block is provided with a mounting opening, the alloy cutter is mounted in the mounting opening, the mounting block is provided with a threaded hole extending through the mounting opening, the threaded hole is threadedly connected to a fixing screw, and the end of the fixing screw contacts the side of the alloy cutter. With this design, the alloy cutter can be fixed by rotating the fixing screw, and replacement is simple, convenient and quick.

[0008] Furthermore, the alloy cutter is detachably equipped with an alloy blade, the shape of which is designed to mimic the thread of the large-diameter bolt. This design ensures the long-term use of the alloy cutter by replacing the alloy blade.

[0009] The beneficial effects of using this utility model are as follows: By adopting the structural design of this utility model, the damaged threads of large-diameter bolts can be tapped by rotating the nut, thereby ensuring that the large-diameter bolts can continue to be used. By adopting the structural design of this utility model, after tapping is completed, the threads of the large-diameter bolt that has been tapped and repaired can be inspected by continuing to rotate the nut, thereby ensuring that the tapping is qualified and can be used normally. Attached Figure Description

[0010] This utility model can be further illustrated by the non-limiting embodiments given in the accompanying drawings; Figure 1 This is a structural schematic diagram of an embodiment of a large-diameter bolt tapping device according to the present invention; Figure 2 This is a cross-sectional structural schematic diagram of an embodiment of a large-diameter bolt tapping device of this utility model; The symbols for the main components are explained below: 1. Large diameter bolt; 2. Nut; 3. Tightening notch; 4. Mounting block; 5. Alloy cutter; 6. Mounting port; 7. Threaded hole; 8. Fixing screw; 9. Alloy blade. Detailed Implementation

[0011] To enable those skilled in the art to better understand this utility model, the technical solution of this utility model will be further described below in conjunction with the accompanying drawings and embodiments. Example

[0012] like Figure 1 , Figure 2 As shown, the present invention provides a large-diameter bolt tapping device, including a nut 2 that meshes with a large-diameter bolt 1. The nut 2 has a screwing notch 3 on its top and an mounting block 4 on its side. An alloy cutter 5 is mounted on the mounting block 4, and the contact end of the alloy cutter 5 contacts the thread groove of the large-diameter bolt 1.

[0013] In this implementation case, the nut 2 is first screwed into the large-diameter bolt 1 a certain distance until it does not move when shaken. Then, the alloy cutter 5 is installed, ensuring that the cutting surface of the alloy cutter 5 after installation contacts the side of the thread on the large-diameter bolt 1. Then, the nut 2 can be rotated until the cutting surface of the alloy cutter 5 contacts the damaged thread of the large-diameter bolt 1. As the nut 2 continues to move, the alloy cutter 5 will tap the thread of the damaged part. Furthermore, the nut 2 can be rotated repeatedly at this point to achieve repeated cutting and repair of the damaged area. After the repair is completed, you can continue to rotate nut 2 so that nut 2 passes through the repair area to verify whether the repair area is qualified. If it is not qualified, return to continue the repair. It should be noted that the large-diameter bolt 1 is too large to be turned using a wrench or similar tool. Therefore, a turning notch 3 is provided. Under this notch, relevant personnel can use a strip or stick to insert into the turning notch 3 to turn the nut 2. Moreover, when cutting, the force applied to the nut 2 in this way can meet the cutting force. Furthermore, it is not difficult for those skilled in the art to understand that after the alloy cutter 5 is fixedly installed, it cannot be subjected to force during use, just as the position of the cutter does not move during the use of a lathe in the prior art, which is an existing technology that can be achieved. Example

[0014] like Figure 1 As shown, the mounting block 4 has an arc surface that matches the shape of the nut 2, and the mounting block 4 is fixedly installed on the nut 2 by welding.

[0015] In this implementation example, the mounting block 4 has an arc surface that perfectly matches the outer circumference of the nut 2. During assembly, the arc surface is tightly fitted to the outer wall of the nut 2, and then the two are fixedly connected by welding. This arc surface design can significantly increase the contact area between the mounting block 4 and the nut 2, avoid local stress concentration, significantly enhance the connection stability and overall structural strength, and the welded connection has the characteristics of strong load-bearing capacity and high structural strength, which can meet the stress requirements during tapping operations. In addition, when welding conditions are not available on site or subsequent disassembly and adjustment are required, a screw connection method can be used according to actual needs. By pre-setting threaded holes at corresponding positions on the mounting block 4 and the nut 2, screws can be inserted to achieve fixation, balancing connection reliability and usage flexibility. Example

[0016] like Figure 1 As shown, the mounting block 4 has a mounting opening 6, the alloy cutter 5 is mounted in the mounting opening 6, the mounting block 4 has a threaded hole 7 that extends through to the mounting opening 6, the threaded hole 7 is threadedly connected to a fixing screw 8, and the end of the fixing screw 8 contacts the side of the alloy cutter 5.

[0017] In this implementation, a mounting opening 6, which matches the shape of the alloy cutter 5, is first made on the mounting block 4. The alloy cutter 5 is then embedded into the mounting opening 6 for initial positioning. Simultaneously, a threaded hole 7 is machined on the mounting block 4, extending through the mounting opening 6. A fixing screw 8 is then screwed into the threaded hole 7 until the end of the fixing screw 8 is tightly abutted against the side of the alloy cutter 5. The alloy cutter 5 is then fixed by tightening force. This design does not require a complex assembly structure; simply rotating the fixing screw 8 is sufficient to quickly tighten and unlock the alloy cutter 5. When the cutter is worn and needs to be replaced, simply loosen the fixing screw 8 in the opposite direction to remove the old cutter and install the new one. The entire process is simple to operate, time-saving, and can effectively improve the efficiency of tapping operations. Example

[0018] like Figure 1 As shown, the alloy cutter 5 is detachably equipped with an alloy blade 9, the shape of which is designed to mimic the thread of the large-diameter bolt 1.

[0019] In this implementation case, the working end of the alloy cutter 5 is equipped with a detachable connection structure. The alloy blade 9 is assembled and fixed to the alloy cutter 5 through this structure. The cutting edge of the alloy blade 9 strictly conforms to the thread tooth shape, pitch, and tooth angle of the large-diameter bolt 1. When the alloy blade 9 is worn or chipped during tapping operations, it is not necessary to replace the entire alloy cutter 5. Only the old alloy blade 9 needs to be removed and replaced with a new alloy blade 9 to restore the working capability of the alloy cutter 5. This not only avoids the waste caused by the scrapping of the entire cutter and greatly extends the overall service life of the alloy cutter 5, but also reduces the cost of consumables. At the same time, the conformal design can ensure the accuracy of the bolt thread after tapping and ensure the repair quality.

[0020] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A large-diameter bolt tapping device, comprising a nut (2) that meshes with a large-diameter bolt (1), characterized in that: The nut (2) has a screwing notch (3) on its top, and an mounting block (4) is installed on the side of the nut (2). An alloy cutter (5) is installed on the mounting block (4), and the contact end of the alloy cutter (5) contacts the thread groove of the large-diameter bolt (1).

2. The large diameter bolt tapping apparatus of claim 1, wherein: The mounting block (4) has an arc surface that matches the shape of the nut (2), and the mounting block (4) is fixedly installed on the nut (2) by welding.

3. The large diameter bolt tapping apparatus of claim 2, wherein: The mounting block (4) is provided with a mounting opening (6), the alloy cutter (5) is mounted in the mounting opening (6), the mounting block (4) is provided with a threaded hole (7) extending through the mounting opening (6), the threaded hole (7) is threadedly connected with a fixing screw (8), and the end of the fixing screw (8) contacts the side of the alloy cutter (5).

4. The large-diameter bolt tapping equipment according to claim 3, characterized in that: The alloy cutter (5) is detachably equipped with an alloy blade (9), the shape of which is designed to mimic the thread of the large-diameter bolt (1).

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