A high-pressure main steam valve jaw bolt dismounting device

Abstract

A kind of high-pressure main steam valve bite bolt dismounting device.Oxidation film is pulled and broken when burr is pulled out on the surface of thread, causing thread to be locked, and bolt fracture phenomenon is found, bolt is difficult to remove after bolt fracture.The utility model discloses a drill bit and a rod head, two opposite faces of the rod head are slidably connected with sleeve plates respectively, the sleeve plate is a semicircular sleeve plate, a taper hole is formed in the front end of the sleeve plate, a compression taper is inserted into the taper hole, a plurality of compression sockets are fixed on the length direction of the circumference of each sleeve plate.The utility model is applied to high-pressure main steam valve bite bolt dismounting.

Description

Technical Field

[0001] This utility model relates to a device for disassembling the bite bolts of a high-pressure main steam valve. Background Technology

[0002] During turbine maintenance, metal inspection revealed that the bolts at the mating surfaces of the main steam valve and regulating valve were seized and damaged, requiring replacement. However, during the disassembly and replacement process, it was discovered that the main steam valve and regulating valve bolts had not been disassembled for many years during a major overhaul cycle. The bolts had been operating at high temperatures for extended periods, resulting in a thick layer of oxide scale on their surface. This oxide scale had coalesced to form a hard oxide film. When this oxide film broke, burrs were pulled from the thread surface, causing the threads to seize. Simultaneously, bolt breakage was also observed, making bolt removal extremely difficult. Summary of the Invention

[0003] The purpose of this utility model is to solve the above-mentioned technical problems and provide a high-pressure main steam valve seam bolt disassembly device.

[0004] The above objectives are achieved through the following technical solutions:

[0005] A high-pressure main steam valve seam bolt removal device comprises a drill bit and a rod head. The two opposite surfaces of the rod head are slidably connected to a sleeve plate. The sleeve plate is a semi-circular sleeve plate. A conical hole is opened at the front end of the sleeve plate. A pressure cone is inserted into the conical hole. Multiple pressure recesses are fixed along the length direction on the circumference of each sleeve plate.

[0006] The aforementioned high-pressure main steam valve seam bolt removal device includes a pressure cone with a conical head and support columns fixed at both the upper and lower ends, the support columns passing through sliding holes in the sleeve plate.

[0007] The high-pressure main steam valve seam bolt removal device has a handle fixed on each of the aforementioned sleeve plates. Beneficial effects

[0008] 1. This utility model can be used to drill holes in bolts. After drilling, a tapping cone is used to make the sleeve plate slide. The indentation head on the sleeve plate is pressed into the inner wall of the bolt hole. In this way, the bolt can be easily unscrewed and disassembled by turning the bolt with this device.

[0009] 2. This utility model has a simple structure and can be applied to the removal of bolts with a diameter larger than the diameter of the drill hole. Attached Figure Description

[0010] Appendix Figure 1 This is the front view of this utility model;

[0011] Appendix Figure 2 This is a top view of the present invention;

[0012] Appendix Figure 3It is attached Figure 1 Sectional view of section AA;

[0013] Appendix Figure 4 This is a schematic diagram of the internal structure of this utility model;

[0014] Appendix Figure 5 It is attached Figure 4 Enlarged view of part B;

[0015] Appendix Figure 6 This is a schematic diagram of the structure of this utility model in use;

[0016] In the diagram: 1. Drill bit; 2. Rod head; 3. Sleeve plate; 4. Concave head; 5. Hand grip; 6. Cone; 7. Sliding hole; 8. Support; 9. Sliding head; 10. Conical hole; 11. Stepped hole; 12. Seated bolt; 13. Main steam valve. Detailed Implementation

[0017] Reference Figures 1-5 A high-pressure main steam valve seam bolt disassembly device comprises a drill bit 1 and a rod head 2. The drill bit is a drilling drill bit with a rod head, which is square-shaped. A sleeve plate 3 is slidably connected to two opposite surfaces of the rod head. Multiple sliding heads 9 are fixed on the rod head. A stepped hole 11 is opened at the position corresponding to the sliding head of the sleeve plate. The sliding head is located in the stepped hole, which allows the sleeve plate to slide. The sleeve plate is a semi-circular sleeve plate. A conical hole 10 is opened at the front end of the sleeve plate. A pressure cone 6 is inserted into the conical hole. Multiple pressure recesses 4 are fixed along the length direction on the circumference of each sleeve plate. The pressure recesses are alloy steel heads.

[0018] The pressure cone is a cone head, with support columns 8 fixed at its upper and lower ends, and the support columns pass through the sliding holes 7 on the sleeve plate.

[0019] Each of the aforementioned plates is fixed with a hand grip 5.

[0020] Working principle: Refer to Figure 6 When using this device, hold the handle and drill into the center of the bolt with a drill bit. After drilling, use the hand tool to strike the pressure cone. The conical surface of the pressure cone matches the conical hole of the sleeve plate. By striking the pressure cone, the sleeve plates on both sides will gradually separate. After separation, the pressure head presses against the inner wall of the bolt hole. Continue striking the pressure cone to further separate the sleeve plates. The pressure head will press into the inner wall of the bolt hole. After pressing in, continue holding the handle and rotate the device forcefully to loosen the bolt and disassemble it.

Claims

1. A device for removing high-pressure main steam valve interlocking bolts, characterized in that: Its components include a drill bit and a rod head. The two opposite surfaces of the rod head are slidably connected to a sleeve plate. The sleeve plate is a semi-circular sleeve plate. The front end of the sleeve plate has a conical hole. A pressure cone is inserted into the conical hole. Multiple pressure concave heads are fixed on the circumferential surface of each sleeve plate along the length direction.

2. The high-pressure main steam valve seam bolt disassembly device according to claim 1, characterized in that: The pressure cone has a conical head, with support columns fixed at both the upper and lower ends, and the support columns pass through sliding holes in the sleeve plate.

3. The high-pressure main steam valve seam bolt removal device according to claim 2, characterized in that: Each of the aforementioned plates is fitted with a hand grip.

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