A device for disassembling the large nut on the end cover of a feedwater pump in a thermal power plant

Abstract

This utility model discloses a device for disassembling the large nut on the end cover of a feedwater pump in a thermal power plant. It includes a rotating chamber, a fixed bushing, a first ball bearing, a telescopic arm, and a disassembly head. The fixed bushing is rotatably connected to the rotating chamber via the first ball bearing. Several evenly spaced telescopic arms are movably inserted into one end wall of the rotating chamber, and the disassembly head is fixedly installed at the end of each telescopic arm away from the rotating chamber. Advantages: This utility model device, by adjusting the extension length of the telescopic arms, can accommodate the removal of large nuts on the end covers of feedwater pumps of different sizes and models. It is reusable, highly practical, and achieves rapid removal of the large nut, significantly shortening the disassembly time and saving labor.

Description

Technical Field

[0001] This utility model relates to the field of feedwater pumps in thermal power plants, and in particular to a device for disassembling the large nut on the end cover of a feedwater pump in a thermal power plant. Background Technology

[0002] The water pump end cover is a crucial component for sealing the internal cavity of the water pump, and the large nuts on the end cover are essential for securing it. Typically, there are 16 large nuts on the water pump end cover, each weighing approximately 30 kg, with a tightening force of about 75 MPa between each nut and bolt. Therefore, during maintenance, it takes workers about half an hour to remove each nut, requiring the assistance of a crane and hydraulic press. This is not only labor-intensive and time-consuming, but also extremely inefficient and poses safety hazards to personnel during disassembly. Utility Model Content

[0003] The main purpose of this utility model is to provide a device for dismantling the large nut on the end cover of a feedwater pump in a thermal power plant, which can effectively solve the problems in the background art such as long dismantling time, cumbersome mechanical coordination, low work efficiency, and great safety hazards during dismantling.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a device for disassembling the large nut on the end cover of a feedwater pump in a thermal power plant, comprising: a rotating chamber, a fixed bushing, a first ball bearing, a telescopic arm, and a disassembly head; the fixed bushing is coaxially rotatably connected to the rotating chamber via the first ball bearing; a plurality of evenly arranged telescopic arms are movably inserted into one end side wall of the rotating chamber, and the disassembly head is fixedly provided at the end of the telescopic arm away from the rotating chamber.

[0005] Furthermore, a bevel gear disc is coaxially rotatably connected to the outer wall of the fixed bushing inside the rotating chamber via a second ball bearing. A through hole is provided on the side wall of the rotating chamber on the side of the bevel gear disc away from the telescopic arm. A rotating shaft is rotatably mounted in the through hole via a bearing. A bevel gear is coaxially fixed at one end of the rotating shaft located inside the rotating chamber. The bevel gear meshes with the bevel gear disc for transmission. Threads that engage with each other are provided on the opposite surfaces of the bevel gear disc and the telescopic arm.

[0006] Furthermore, slots are provided on the side walls of the telescopic arm on both sides of the threaded telescopic arm, and I-shaped insertion holes matching the telescopic arm are provided on the side walls of the rotating chamber, with the middle section of the insertion hole movably engaged in the slots.

[0007] Furthermore, a rotating chamber cover is fixedly provided at the other end of the rotating chamber away from the telescopic arm. One end of the fixed bushing passes through the rotating chamber cover and is located outside the rotating chamber. A locking screw is threaded through the side wall of the fixed bushing.

[0008] Furthermore, the disassembly head includes a cylinder, a piston sleeve, a tensioning head, and support seats. The side wall of the cylinder and the end of the telescopic arm away from the rotating chamber are fixedly connected. A coaxially arranged piston sleeve is movably disposed within the cylinder, forming a hydraulic oil chamber between the piston sleeve and the cylinder. A quick connector communicating with the hydraulic oil chamber is fixedly disposed on the side wall of the cylinder. The tensioning head is movably inserted within the piston sleeve. A boss is integrally formed on the outer side of one end of the tensioning head, and the inner side of the boss abuts against the end face of one end of the piston sleeve. A thread matching the bolts on the end cap of the water pump is provided on the inner wall of the other end of the tensioning head. Two opposing support seats are fixedly connected to the end of the cylinder away from the boss by cylinder screws.

[0009] Furthermore, it also includes a pull ring, the inner wall shape of which matches the shape of the large nut on the water pump end cover; several pull holes are opened on the side wall of the pull ring; the outer diameter of the pull ring is smaller than the distance between the two support seats, and it can be movably inserted between the two support seats.

[0010] Furthermore, a cover plate is fixedly connected to the other end of the cylinder by pan head screws; one end of the stretching head movably passes through the cover plate.

[0011] This utility model has the following beneficial effects:

[0012] (1) This device can be reused and is highly practical because the extension length of the telescopic arm can be adjusted to accommodate the removal of the large nut on the end cover of different sizes and models of water pumps.

[0013] (2) The disassembly head of this device first puts the pull ring on the large nut, then puts the cylinder on the bolt, and the two support seats are located on both sides of the pull ring and abut against the end cover of the water pump. Then, the tension head is screwed on the bolt. After that, hydraulic oil is introduced into the hydraulic oil chamber, so that the piston sleeve pushes against the tension head and drives the bolt to move away from the end cover. This causes the bolt to undergo slight elastic deformation and elongation, so that a gap is formed between the large nut and the end cover, the preload of the bolt is removed, and the large nut is easily turned. This achieves the rapid removal of the large nut, greatly shortens the disassembly time of the large nut, saves labor, and ensures the safety of personnel during disassembly. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the overall structure of a device for disassembling the large nut on the end cover of a water pump in a thermal power plant, according to the present invention.

[0016] Figure 2 for Figure 1 A cross-sectional view of section AA.

[0017] Figure 3 This is a rear view schematic diagram of the overall structure of the device for disassembling the large nut on the end cover of a water pump in a thermal power plant, according to the present invention.

[0018] Figure 4 This is a schematic diagram of the rotating structure of a device for disassembling the large nut on the end cover of a water pump in a thermal power plant, according to the present invention.

[0019] Figure 5 This is a schematic diagram of the connection structure between the bevel gear disc and the telescopic arm of a device for disassembling the large nut on the end cover of a water pump in a thermal power plant, according to this utility model.

[0020] Figure 6 This is a schematic diagram of the connection structure between the telescopic arm and the disassembly head of a device for disassembling the large nut on the end cover of a water pump in a thermal power plant, according to this utility model.

[0021] Figure 7 This is a schematic diagram of the internal structure of the disassembly head of the disassembly head of the disassembly device for the large nut of the end cover of a water pump in a thermal power plant, according to the present invention.

[0022] In the diagram: Rotating chamber 1, insertion hole 101, fixed bushing 2, first ball bearing 3, telescopic arm 4, slot 41, disassembly head 5, cylinder body 51, piston sleeve 52, extension head 53, support seat 54, pull ring 55, pry hole 551, hydraulic oil chamber 56, quick connector 57, cover plate 58, second ball bearing 6, bevel gear disc 7, rotating shaft 8, bevel gear 9, rotating chamber cover 10, locking screw 11. Detailed Implementation

[0023] The following is in conjunction with the appendix Figure 1 To be continued Figure 7 The principles and features of this utility model are described, making the technical means, creative features, and achieved objectives of this utility model easy to understand, and further elaborating on this utility model.

[0024] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] like Figure 1-7 As shown, a device for disassembling the large nut on the end cover of a feedwater pump in a thermal power plant includes: a rotating chamber 1, a fixed bushing 2, a first ball bearing 3, a telescopic arm 4, and a disassembly head 5. The fixed bushing 2 is coaxially rotatably connected to the rotating chamber 1 via the first ball bearing 3. Four evenly spaced telescopic arms 4 are movably inserted into the side wall of one end of the rotating chamber 1. The disassembly head 5 is fixedly installed at the end of the telescopic arm 4 away from the rotating chamber 1. By adjusting the extension length of the telescopic arm 4, it can accommodate the disassembly of the large nut on the end cover of feedwater pumps of different sizes and models. It is reusable and highly practical.

[0027] A bevel gear 7 is coaxially rotatably connected to the outer wall of the fixed bushing 2 inside the rotating chamber 1 via a second ball bearing 6. A through hole is provided on the side wall of the rotating chamber 1 on the side of the bevel gear 7 away from the telescopic arm 4. A rotating shaft 8 is rotatably mounted in the through hole via a bearing. A bevel gear 9 is coaxially fixed at one end of the rotating shaft 8 located inside the rotating chamber 1. The bevel gear 9 and the bevel gear 7 mesh with each other for transmission. The bevel gear 7 and the telescopic arm 4 are provided with mutually mating threads. By rotating the rotating shaft 8, the bevel gear 9 is driven to rotate. The rotating bevel gear 9 drives the bevel gear 7 to rotate. The rotating bevel gear 7 drives the telescopic arm 4 to extend and retract along the insertion hole 101 through the mutually mating threads, thereby realizing the adjustment of the extension length of the telescopic arm 4, while ensuring that the extension and retraction lengths of the four telescopic arms 4 are consistent.

[0028] On the side walls of the telescopic arm 4 on both sides of the thread, there are slots 41 arranged along its length direction. On the side wall of the rotating chamber 1, there are I-shaped insertion holes 101 that match the telescopic arm 4. The middle section of the insertion hole 101 is movably engaged in the slot 41 to ensure that the telescopic arm 4 extends and retracts along the insertion hole 101.

[0029] A rotating chamber cover 10 is fixed at the other end of the rotating chamber 1 away from the telescopic arm 4. One end of the fixed bushing 2 passes through the rotating chamber cover 10 and is placed outside the rotating chamber 1. A locking screw 11 is screwed through the side wall of the fixed bushing 2. The fixed bushing 2 is sleeved on the central shaft of the water pump. After the telescopic arm 4 is adjusted to the correct length and the disassembly head 5 is put on the bolt, the fixed bushing 2 is fixed on the central shaft of the water pump by tightening the locking screw.

[0030] The disassembly head 5 includes a cylinder body 51, a piston sleeve 52, a tension head 53, a support seat 54, and a pull ring 55. The side wall of the cylinder body 51 and the end of the telescopic arm 4 away from the rotating chamber 1 are fixedly connected. The piston sleeve 52 is movably arranged coaxially inside the cylinder body 51, and a hydraulic oil chamber 56 is formed between the piston sleeve 52 and the cylinder body 51. A quick connector 57 connected to the hydraulic oil chamber 56 is fixedly arranged on the side wall of the cylinder body 51. The tension head 53 is movably inserted inside the piston sleeve 52. A boss is integrally formed on the outer side of one end of the tension head 53, and the inner side of the boss abuts against the end face of one end of the piston sleeve 52. The inner wall of the other end of the tension head 53 is provided with threads that match the bolts of the water pump end cover. Two opposing support seats 54 are fixedly connected to the end of the cylinder body 51 away from the boss by screws. After adjusting the length of the telescopic arm 4, first, place the pull ring 55 onto the large nut, then place the cylinder body 51 onto the bolt. The two support seats 54 are located on both sides of the pull ring 55 and abut against the end cover of the water pump. Next, screw the extension head 53 onto the bolt. Then, introduce hydraulic oil into the hydraulic oil chamber 56, causing the piston sleeve 52 to push against the extension head 53, moving the bolt away from the end cover. This causes a slight elastic deformation and elongation of the bolt, creating a gap between the large nut and the end cover, releasing the bolt's preload, and easily loosening the large nut. This achieves rapid removal of the large nut, significantly shortening the disassembly time and saving labor. After removing all the large nuts from their respective bolts a certain distance, drain the hydraulic oil, allowing the bolts to return to their original shape. Then, unscrew the extension head 53 from the bolt, loosen the locking screw, and remove the device from the bolt. Finally, unscrew the loosened large nuts from the bolt again, achieving rapid removal of the large nuts and significantly shortening the disassembly time, saving labor.

[0031] The inner wall shape of the pull ring 55 matches the shape of the large nut on the water pump end cover. Several pry holes 551 are opened on the side wall of the pull ring 55. When rotating the pull ring 55, tools such as pry bars are inserted into the pry holes 551 to pry the pull ring 55 to rotate, thereby loosening the large nut. The outer diameter of the pull ring 55 is smaller than the distance between the two support seats 54, and it can be movably inserted between the two support seats 54. A cover plate 58 is fixedly connected to the other end of the cylinder body 51 by pan head screws. One end of the tension head 53 movably passes through the cover plate 58.

[0032] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A device for removing a large nut of a feed water pump end cover of a thermal power plant, characterized in that, It includes: The rotating chamber comprises a fixed bushing, a first ball bearing, a telescopic arm, and a disassembly head. The fixed bushing is rotatably connected to the rotating chamber via the first ball bearing. Several evenly spaced telescopic arms are movably inserted into one side wall of the rotating chamber, and the disassembly head is fixedly installed at the end of the telescopic arm away from the rotating chamber.

2. The device according to claim 1, wherein A bevel gear disc is coaxially rotatably connected to the outer wall of the fixed bushing inside the rotating chamber via a second ball bearing. A through hole is provided on the side wall of the rotating chamber away from the telescopic arm on the side of the bevel gear disc. A rotating shaft is rotatably mounted in the through hole via a bearing. A bevel gear is coaxially fixed at one end of the rotating shaft located inside the rotating chamber. The bevel gear meshes with the bevel gear disc for transmission. Threads that engage with each other are provided on the opposite surfaces of the bevel gear disc and the telescopic arm.

3. The device for disassembling the large nut on the end cover of a feedwater pump in a thermal power plant according to claim 2, characterized in that, On the sidewalls of the telescopic arm on both sides of the thread, there are slots arranged along its length. On the sidewall of the rotating chamber, there are I-shaped insertion holes that match the telescopic arm. The middle section of the insertion hole is movably engaged in the slot.

4. The device for disassembling the large nut on the end cover of a feedwater pump in a thermal power plant according to claim 3, characterized in that, A rotating chamber cover is fixedly installed at the other end of the rotating chamber away from the telescopic arm. One end of the fixed bushing passes through the rotating chamber cover and is located outside the rotating chamber. A locking screw is threaded through the side wall of the fixed bushing.

5. A device for disassembling the large nut on the end cover of a feedwater pump in a thermal power plant according to any one of claims 1-4, characterized in that, The disassembly head includes a cylinder, a piston sleeve, a tensioning head, and support seats. The side wall of the cylinder and the end of the telescopic arm away from the rotating chamber are fixedly connected. A coaxially arranged piston sleeve is movably disposed within the cylinder, forming a hydraulic oil chamber between the piston sleeve and the cylinder. A quick connector communicating with the hydraulic oil chamber is fixedly disposed on the side wall of the cylinder. The tensioning head is movably inserted within the piston sleeve. A boss is integrally formed on the outer side of one end of the tensioning head, and the inner side of the boss abuts against the end face of one end of the piston sleeve. The inner wall of the other end of the tensioning head is provided with threads that match the bolts on the end cap of the water pump. Two opposing support seats are screwed to the end of the cylinder away from the boss by cylinder screws.

6. The device for disassembling the large nut on the end cover of a feedwater pump in a thermal power plant according to claim 5, characterized in that, It also includes a pull ring, the inner wall shape of which matches the shape of the large nut on the water pump end cover; several pull holes are opened on the side wall of the pull ring; the outer diameter of the pull ring is smaller than the distance between the two support seats.

7. The device for disassembling the large nut on the end cover of a feedwater pump in a thermal power plant according to claim 5, characterized in that, A cover plate is fixedly connected to the other end of the cylinder by pan head screws; one end of the stretching head moves through the cover plate.

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