Turbine nut dismounting anti-falling device

Abstract

The steam turbine nut dismounting anti-falling device comprises a lifting rod, a first installation hole is formed in the bottom face of the lifting rod, a first hanging rod is fixedly installed on the first installation hole, and a first hook is hung on the first hanging rod; and an anti-falling disc is arranged below the lifting rod. A second mounting hole is formed in the surface of the anti-falling disc, a second hanging rod is fixedly mounted on the side wall of the second mounting hole, and a second hook is arranged on the second hanging rod. The second mounting hole is located in the center of the anti-falling disc. The length of the lifting rod is larger than the diameter of the anti-falling disc. The anti-falling device has the advantages that the chain can be hung, the anti-falling disc is connected with the chain from the bottom of the stud, the risk that the stud and a nut fall off due to free falling when the vertical high-temperature stud is disassembled can be effectively prevented, use is safer and more reliable, safety of operators is guaranteed, the height can be adjusted at will, operation is more flexible, and the anti-falling device is suitable for popularization and application. The application range is wide.

Description

Technical Field

[0001] This utility model relates to the technical field of auxiliary tools for disassembling vertical high-temperature double-headed bolts for steam turbines, specifically a device for preventing the falling off of steam turbine nuts during disassembly. Background Technology

[0002] A steam turbine, also known as a steam engine, is a rotary steam power unit. High-temperature, high-pressure steam passes through a fixed nozzle, becomes an accelerated airflow, and is then injected onto blades, causing a rotor equipped with rows of blades to rotate and perform work. Steam turbines are the main equipment in modern thermal power plants and are also used in the metallurgical industry, chemical industry, and ship propulsion systems.

[0003] Currently, steam turbines all utilize high-temperature, high-pressure steam as their power source. The steam temperature is generally above 380℃, therefore, all steam turbine fastening bolts are high-temperature bolts. According to maintenance guidelines, steam turbines need to undergo a Class A overhaul every 5-7 years to ensure equipment safety and economy. During a Class A overhaul, the bolt holes on the horizontal split surfaces of the upper and lower cylinders of the high- and intermediate-pressure outer and inner cylinders of the steam turbine are designed as through holes. The bolts are high-temperature double-ended bolts, with high-temperature nuts installed at both the top and bottom. When disassembling these bolts, the upper nut is easier to remove, so disassembly is generally done by removing the upper nut. This creates a problem: when removing the upper nut, the double-ended bolt and the bottom nut experience free fall due to gravity and lack of protection.

[0004] To address this issue, a special anti-fall device was designed for the disassembly of high-temperature nuts on steam turbines, which prevents the risk of bolts and nuts falling off when disassembling vertical high-temperature double-ended screws. Utility Model Content

[0005] The purpose of this utility model is to provide a turbine nut removal anti-fall device with reasonable and simple structural design, convenient operation, low processing and manufacturing cost, which can suspend the chain and connect the anti-fall plate to the chain from the bottom of the double-headed bolt. It can effectively prevent the risk of bolts and nuts falling due to free fall when disassembling vertical high-temperature double-headed bolts, making it safer and more reliable, ensuring the safety of operators, and allowing for arbitrary height adjustment, making operation more flexible and applicable to a wide range of applications.

[0006] This utility model discloses a turbine nut removal and anti-fall device, including a lifting rod, a first mounting hole on the bottom surface of the lifting rod, a first hanging rod fixedly installed in the first mounting hole, and a first hook hanging on the first hanging rod; an anti-fall plate is provided below the lifting rod.

[0007] The lifting rod and the first hook on its bottom surface are designed to suspend a chain during the disassembly of the vertically mounted high-temperature double-ended screw of the steam turbine. The chain is threaded through the dustproof hole of the high-temperature nut and the heating hole of the high-temperature double-ended screw, allowing for convenient suspension and facilitating subsequent disassembly of the high-temperature double-ended screw by operators. This saves time and effort, improves operational convenience, and enhances safety. The anti-fall plate catches the high-temperature double-ended screw and nut from falling during disassembly, preventing them from falling due to free fall and further ensuring the safety of the operator's working environment.

[0008] The surface of the anti-fall disc is provided with a second mounting hole, and a second hanging rod is fixedly installed on the side wall of the second mounting hole. A second hook is provided on the second hanging rod.

[0009] The second mounting hole is located at the center of the anti-fall plate.

[0010] The lifting rod and the first hook on its bottom surface are designed to suspend a chain during disassembly of the vertically installed high-temperature double-ended screw of the steam turbine. The chain is inserted through the dustproof hole of the high-temperature nut and the heating hole of the high-temperature double-ended screw, allowing for convenient suspension. An anti-fall plate is then connected to the chain from the bottom of the high-temperature double-ended screw. The chain length is adjusted according to the length of the high-temperature double-ended screw, and the anti-fall plate can move freely with the chain as needed by the operator, better supporting the high-temperature double-ended screw and nut. This makes operation more flexible and prevents the high-temperature double-ended screw and nut from falling due to free fall during disassembly, further improving operational safety and ensuring the safety of the operator.

[0011] The length of the lifting rod is greater than the diameter of the anti-fall plate.

[0012] The length of the lifting rod is greater than the diameter of the anti-fall plate, which makes the lifting of the lifting rod more stable and improves the stability of the entire device. Since the high-temperature double-ended bolts and nuts fall and concentrate at one point, the anti-fall plate is designed in accordance with the principle of gravity of falling objects, making it more targeted.

[0013] The width of the second hanging rod is greater than the width of the first hanging rod, and the arc of the contact point between the first hook and the first hanging rod is less than the arc of the contact point between the second hook and the second hanging rod.

[0014] The curvature of the contact point between the first hook and the first hanging rod is set to be smaller than the curvature of the contact point between the second hook and the second hanging rod. Since the width of the second hanging rod is greater than the width of the first hanging rod, the first hook and the first hanging rod can make a closer contact, and the second hook and the second hanging rod can make a closer contact, thus fully ensuring the safety of the suspension.

[0015] The first hook is connected to the top of the chain, which is installed inside a high-temperature double-ended screw. The high-temperature double-ended screw has a bolt heating hole, and the chain is located inside the bolt heating hole. Nuts are fixedly installed at both ends of the high-temperature double-ended screw, and the two ends of the chain extend out of the ends of the high-temperature double-ended screw. The bottom end of the chain is connected to a second hook.

[0016] The beneficial effects of this utility model are:

[0017] 1) The lifting rod and the first hook on the bottom of the lifting rod are installed to suspend the chain when disassembling the high-temperature double-ended screw installed vertically on the turbine. The chain is inserted through the dustproof hole of the high-temperature nut and the heating hole of the high-temperature double-ended screw, which can conveniently suspend the chain and facilitate the subsequent disassembly of the high-temperature double-ended screw by the operator, saving time and effort, improving the convenience of operation, and improving safety. The anti-fall plate can catch the high-temperature double-ended screw and nut from falling during the disassembly of the high-temperature double-ended screw, and prevent the double-ended screw and nut from falling due to free fall when disassembling the vertical high-temperature double-ended screw, further ensuring the safety of the operator's working environment.

[0018] 2) The lifting rod and the first hook on the bottom of the lifting rod are used to suspend the chain when disassembling the high-temperature double-ended screw installed vertically on the turbine. The chain is inserted through the dust hole of the high-temperature nut and the heating hole of the high-temperature double-ended screw, which can easily suspend the chain. Then, the anti-fall plate is connected to the chain from the bottom of the high-temperature double-ended screw. The length of the chain is adjusted according to the length of the high-temperature double-ended screw. The anti-fall plate can be moved freely with the chain according to the needs of the operator, so as to better support the high-temperature double-ended screw and nut. The operation is more flexible and can prevent the high-temperature double-ended screw and nut from falling due to free fall during disassembly, further improving the safety performance of the operation and fully ensuring the safety of the operator.

[0019] 3) The length of the lifting rod is greater than the diameter of the anti-fall plate, which makes the lifting of the lifting rod more stable and improves the stability of the entire device. Since the high-temperature double-ended screw and nut fall at the same point, the anti-fall plate is designed in accordance with the principle of gravity of falling objects and is more targeted.

[0020] 4) This device features a reasonable and simple structural design, convenient operation, low manufacturing cost, and the ability to suspend the chain. The anti-fall disc is connected to the chain from the bottom of the high-temperature double-ended screw, effectively preventing the screw and nut from falling during disassembly of the vertical high-temperature double-ended screw. This makes it safer and more reliable, ensuring operator safety. The height can be adjusted arbitrarily, making operation more flexible and applicable to a wide range of situations. The device's structure includes a lifting rod, chain, and anti-fall disc, which are combined and installed on the vertical high-temperature double-ended screw to be disassembled. This prevents the high-temperature double-ended screw and bottom nut from falling after the upper nut loosens during disassembly. Simultaneously, it can be measured, processed, and adjusted according to the high-temperature double-ended screw to be disassembled, meeting the disassembly process requirements of various steam turbine vertical high-temperature double-ended screws. This anti-fall device for disassembling high-temperature nuts is suitable for the disassembly process requirements of various specifications of high-temperature vertical double-ended screws. It is currently in use with good results and deserves widespread promotion and application. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model;

[0022] Figure 2 This is a side view of the lifting rod in this utility model;

[0023] Figure 3 This is a schematic diagram of the anti-falling disc structure in this utility model;

[0024] Figure 4 This is a schematic diagram of the structure of the first hook in this utility model;

[0025] Figure 5 This is a schematic diagram of the structure of the second hook in this utility model;

[0026] Figure 6 This is a diagram showing the usage state of this utility model.

[0027] In the diagram: 1. Lifting rod; 2. First mounting hole; 3. First hook; 4. Anti-fall plate; 5. Second hanging rod; 6. Second hook; 7. Second mounting hole; 8. Chain; 9. Dustproof screw; 10. Nut; 11. High-temperature double-ended screw; 12. Bolt heating hole; 13. Dust plug; 14. First hanging rod. Detailed Implementation

[0028] Example 1.

[0029] The following will be combined with the appendix Figure 1-6 The present invention will be further described below.

[0030] This utility model includes a lifting rod 1, a first mounting hole 2, a first hook 3, an anti-fall plate 4, a chain 8, a dustproof screw 9, a nut 10, a high-temperature double-ended screw 11, a bolt heating hole 12, and a dust plug 13. The specific structure includes a lifting rod 1, with a first mounting hole 2 on the bottom surface of the lifting rod 1. A first hanging rod 14 is fixedly installed on the first mounting hole 2, and the first hook 3 is hung on the first hanging rod 14. An anti-fall plate 4 is provided below the lifting rod 1.

[0031] The length of the lifting rod 1 is greater than the diameter of the anti-fall plate 4.

[0032] Instructions for use: 1) Both the high-temperature vertical double-ended bolts and nuts of the steam turbine are designed with dustproof screws 9 or dustproof plugs 13. First, remove the dustproof screws 9 and dustproof plugs 13; 2) Use the first hook 3 to suspend the chain 8 on the lifting rod 1, and thread the chain 8 through the heating hole 12 between the nut and the high-temperature double-ended bolt 11; 3) Combine the anti-fall plate 4 with the chain 8 extending from the bottom of the high-temperature double-ended bolt 11; 4) Use the lifting rod 1 to lift the combined chain 8 and the anti-fall plate 4, and then press the anti-fall plate 4 against the bottom nut 10 or high-temperature... After the double-headed screw 11 contacts, the first hook 3 on the lifting rod 1 and the first mounting hole 2 of the corresponding chain 8 are resuspended, leaving enough space for the high-temperature double-headed screw 11 to descend; 5) At this time, the vertical high-temperature double-headed screw 11 is protected by this device. When the upper nut 10 is removed, the high-temperature double-headed screw 11 and the bottom nut 10 fall freely. After falling to contact the anti-fall plate 4, it must not fall. Then, using conventional processes, the removed nut 10, high-temperature double-headed screw 11, etc. are lifted out using cranes and other lifting machinery.

[0033] Example 2.

[0034] This utility model includes a lifting rod 1, a first mounting hole 2, a first hook 3, an anti-fall plate 4, a second hanging rod 5, a second hook 6, a second mounting hole 7, a chain 8, a dustproof screw 9, a nut 10, a high-temperature double-ended screw 11, a bolt heating hole 12, a dust plug 13, and a first hanging rod 14. The specific structure includes a lifting rod 1, with a first mounting hole 2 on the bottom surface of the lifting rod 1, and a first hanging rod 14 fixedly installed on the first mounting hole 2. The first hook 3 is hung on the first hanging rod 14. An anti-fall plate 4 is provided below the lifting rod 1.

[0035] The anti-fall disc 4 has a second mounting hole 7 on its surface, and a second hanging rod 5 is fixedly installed on the side wall of the second mounting hole 7. A second hook 6 is provided on the second hanging rod 5.

[0036] The second mounting hole 7 is located at the center of the anti-fall plate 4.

[0037] The length of the lifting rod 1 is greater than the diameter of the anti-fall plate 4.

[0038] The width of the second hanging rod 5 is greater than the width of the first hanging rod 14, and the arc of the contact point between the first hook 3 and the first hanging rod 8 is less than the arc of the contact point between the second hook 6 and the second hanging rod 5.

[0039] The first hook 3 is connected to the top of the chain 8. The chain 8 is installed inside the high-temperature double-ended screw 11. The high-temperature double-ended screw 11 is provided with a bolt heating hole 12. The chain 8 is located inside the bolt heating hole 12. Nuts 10 are fixedly installed at both ends of the high-temperature double-ended screw 11. The two ends of the chain 8 extend out of the two ends of the high-temperature double-ended screw 11 respectively. The bottom end of the chain 8 is connected to the second hook 6.

[0040] The curvature of the contact point between the first hook 3 and the first hanging rod 14 is set to be smaller than the curvature of the contact point between the second hook 6 and the second hanging rod 5. Since the width of the second hanging rod 5 is greater than the width of the first hanging rod 14, the first hook 3 and the first hanging rod 14 can make a closer contact, and the second hook 6 and the second hanging rod 5 can make a closer contact, thus fully ensuring the safety of the suspension.

[0041] Instructions for use: 1) Both the high-temperature vertical double-ended bolts and nuts of the steam turbine are designed with dustproof screws 9 or dustproof plugs 13. First, remove the dustproof screws 9 and dustproof plugs 13; 2) Use the first hook 3 to suspend the chain 8 on the lifting rod 1, and thread the chain 8 through the heating hole 12 between the nut and the high-temperature double-ended bolt 11; 3) Combine the anti-fall plate 4 with the chain 8 extending from the bottom of the high-temperature double-ended bolt 11; 4) Use the lifting rod 1 to lift the combined chain 8 and the anti-fall plate 4, and then press the anti-fall plate 4 against the bottom nut 10 or high-temperature... After the double-headed screw 11 contacts, the first hook 3 on the lifting rod 1 and the first mounting hole 2 of the corresponding chain 8 are resuspended, leaving enough space for the high-temperature double-headed screw 11 to descend; 5) At this time, the vertical high-temperature double-headed screw 11 is protected by this device. When the upper nut 10 is removed, the high-temperature double-headed screw 11 and the bottom nut 10 fall freely. After falling to contact the anti-fall plate 4, it must not fall. Then, using conventional processes, the removed nut 10, high-temperature double-headed screw 11, etc. are lifted out using cranes and other lifting machinery.

Claims

1. A device for preventing the dropping of a steam turbine nut during removal, characterized by: Including the lifting rod (1), the bottom surface of the lifting rod (1) is provided with the first mounting hole (2), the first mounting hole (2) is fixedly installed with the first hanging rod (14), and the first hook (3) is hung on the first hanging rod (14);The lower part of the lifting rod (1) is provided with the anti-falling disc (4).

2. A device for preventing the dropping of a steam turbine nut during removal as claimed in claim 1, characterized in that: The surface of the anti-falling disc (4) is provided with the second mounting hole (7), and the side wall of the second mounting hole (7) is fixedly installed with the second hanging rod (5), and the second hanging rod (5) is provided with the second hook (6).

3. A device for preventing the dropping of a steam turbine nut during removal as claimed in claim 2, wherein: The second mounting hole (7) is located at the center position of the anti-falling disc (4).

4. A device for preventing the dropping of a steam turbine nut during removal as claimed in claim 3, wherein: The length of the lifting rod (1) is greater than the diameter of the anti-falling disc (4).

5. A device for preventing the dropping of a steam turbine nut during removal as claimed in claim 4, wherein: The width of the second hanging rod (5) is greater than the width of the first hanging rod (14), and the curvature of the contact part of the first hook (3) and the first hanging rod (14) is smaller than the curvature of the contact part of the second hook (6) and the second hanging rod (5).

6. A device for preventing the dropping of a steam turbine nut during removal as claimed in claim 5, wherein: The first hook (3) is connected with the top end of the chain (8), the chain (8) is installed in the high-temperature double-end screw rod (11), the high-temperature double-end screw rod (11) is provided with a bolt heating hole (12), and the chain (8) is located in the bolt heating hole (12). The two ends of the high-temperature double-end screw rod (11) are fixedly installed with the nut (10), the two ends of the chain (8) extend out of the two ends of the high-temperature double-end screw rod (11) respectively, and the bottom end of the chain (8) is connected with the second hook (6).

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