Marine cold-mounted connecting shaft bolt dismounting device

Abstract

The utility model relates to a marine cold-mounted connecting shaft bolt dismounting device which comprises a supporting pipe, a connecting nut, a lead screw, a hollow plunger hydraulic oil cylinder and a locking nut. The two ends of the inner diameter of the connecting nut are provided with two kinds of internal threads respectively, one end of the connecting nut is connected with the cold assembly connecting shaft bolt through the internal threads, and the other end is connected with the lead screw. The connecting nut is sleeved with the supporting pipe, one end of the supporting pipe makes contact with the shaft flange, and the other end of the supporting pipe makes contact with the hollow plunger hydraulic oil cylinder. One end of the lead screw is connected with the connecting nut, the other end of the lead screw sequentially penetrates out of the supporting pipe and the hollow plunger hydraulic oil cylinder, and the locking nut is installed on the side, located outside the hollow plunger hydraulic oil cylinder, of the lead screw. In the initial state of disassembling the connecting shaft bolt, the locking nut is located at the tail end of a plunger rod of the hollow plunger hydraulic oil cylinder in the non-working state; the device is simple in structure, easy to operate, low in manufacturing cost and high in applicability.

Description

Technical Field

[0001] The utility model belongs to the technical field of shipbuilding, and particularly relates to a ship-used cold-installed coupling bolt disassembly device. Background Art

[0002] The ship shaft system is an important part of the ship's power plant, which is responsible for transferring the power generated by the main engine to the propeller, and then transferring the axial thrust generated by the propeller to the hull to achieve the purpose of propulsion. The ship shaft system is from the main engine output end flange to the stern shaft, connecting the stern shaft and the propeller, and mainly includes the stern shaft, intermediate shaft, intermediate bearing, stern bearing and other components.

[0003] The connection between the stern shaft and the intermediate shaft, and between the intermediate shaft and the main engine requires the use of coupling bolts. Currently, the commonly used coupling bolts are hydraulic bolts and ordinary bolts. Hydraulic bolts are composed of a tapered sleeve, a bolt, and a nut, and need to be equipped with a special hydraulic tensioner. Hydraulic bolts are easy and quick to install and disassemble, but the hydraulic bolts have a complex structure and high cost. Ordinary bolts have a simple structure and are cheap, but due to the use of interference fit (0.01-0.03mm) technology, dry ice, liquid nitrogen, etc. are required for cold installation during installation, which is highly dangerous. During disassembly, the friction generated by the interference fit is large, and the on-site operating space is small, which makes the construction difficult. If the traditional hammering method is used for forced disassembly, it is very easy to damage the coupling bolts and the shaft flange bolt holes. Utility Model Content

[0004] The technical problem to be solved by the utility model is to reduce the disassembly difficulty, improve the construction efficiency and ensure the disassembly quality during the construction of disassembling marine cold-mounted coupling bolts (interference fit 0.01-0.03mm), so as to provide a marine cold-mounted coupling bolt disassembly device with simple structure, low cost, convenient operation and strong practicality.

[0005] The utility model solves the technical problem by adopting the following technical solutions:

[0006] A marine cold-installed coupling bolt removal device, comprising a support pipe, a connecting nut, a screw rod, a hollow plunger hydraulic cylinder, and a locking nut;

[0007] The two ends of the inner diameter of the connecting nut are respectively provided with two kinds of internal threads, one end of which is connected to the cold-mounted coupling bolt through the internal thread, and the other end is connected to the screw rod;

[0008] The support tube sleeve is arranged outside the connecting nut, and one end of the support tube contacts the shaft flange, and the other end contacts the hollow plunger hydraulic cylinder;

[0009] One end of the screw rod is connected to the connecting nut, and the other end passes through the support tube and the hollow plunger hydraulic cylinder in sequence, and the locking nut is installed on the side of the screw rod outside the hollow plunger hydraulic cylinder;

[0010] And in the initial state of removing the coupling bolt, the locking nut is located at the end of the plunger rod of the hollow plunger hydraulic cylinder in a non-working state.

[0011] Furthermore, when the coupling bolt is removed, there is no contact between the support tube and the connecting nut, and there is no contact between the hollow plunger hydraulic cylinder and the screw rod.

[0012] Furthermore, a support tube gasket is fixedly installed at one end of the support tube, and the support tube is in contact with the shaft flange through the support tube gasket.

[0013] Furthermore, it also includes a hydraulic cylinder pad, which is fixedly installed at the end of the support tube, and the end of the hollow plunger hydraulic cylinder is in contact with the hydraulic cylinder pad.

[0014] Furthermore, a rotation operation hole is provided on the outer wall of the connecting nut.

[0015] Furthermore, lifting rings are fixedly provided on the outer walls of the support tube and the hollow plunger hydraulic cylinder.

[0016] Furthermore, there are at least one pair of lifting rings on the outer walls of the support tube and the hollow plunger hydraulic cylinder.

[0017] The method for removing the ship's cold-installed coupling bolts by using the above-mentioned ship's cold-installed coupling bolt removal device comprises the following steps:

[0018] Install one end of the connecting nut on the cold-mounted coupling bolt, tighten the connecting nut and then back it off half a turn; then install the other end of the connecting nut on the screw rod, tighten the screw rod and then back it off half a turn;

[0019] Put the support tube onto the connecting nut through the screw rod so that there is no contact between the support tube and the connecting nut;

[0020] Pass the hollow plunger hydraulic cylinder through the screw rod so that one end of the cylinder contacts the support tube and the screw rod and the hollow plunger hydraulic cylinder do not contact each other;

[0021] A locking nut is installed at the end of the screw rod, and the locking nut is located at the end of the plunger rod of the hollow plunger hydraulic cylinder;

[0022] Start the hollow plunger hydraulic cylinder and pull out the cold-installed coupling bolt through the locking nut, screw rod and connecting nut.

[0023] The advantages and positive effects of the utility model are:

[0024] The utility model has a simple structure and is easy to operate. It utilizes connecting nuts, locking nuts, and support tubes to complete the connection between the stretching screw rod and the cold-mounted coupling bolts and the hollow hydraulic cylinder. The bolt disassembly can be completed by lifting the hydraulic cylinder. It is also low in cost, does not require high processing precision, uses less materials, and does not require special materials. In addition, it has strong applicability: it only needs to change the size of the connecting bolts to adapt to the disassembly of cold-mounted coupling bolts of various specifications and sizes. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The technical solution of the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments, but it should be understood that these drawings are designed only for the purpose of explanation and are not intended to limit the scope of the utility model. In addition, unless otherwise specified, these drawings are only intended to conceptually illustrate the structural configurations described herein and are not necessarily drawn to scale.

[0026] Figure 1 A schematic diagram of the structure of a cold-installed coupling bolt disassembly device for a ship provided by an embodiment of the utility model;

[0027] Figure 2 A schematic diagram of the installation of a connecting nut, a cold-installed coupling bolt and a tensioning screw rod in a marine cold-installed coupling bolt removal device provided by an embodiment of the utility model;

[0028] Figure 3 A schematic diagram of the installation of a support pipe in a marine cold-installed coupling bolt removal device provided by an embodiment of the utility model;

[0029] Figure 4 A schematic diagram of the installation of a hollow plunger hydraulic cylinder and a locking nut in a marine cold-installed coupling bolt removal device provided by an embodiment of the utility model;

[0030] Figure 5 The hollow plunger hydraulic cylinder in the marine cold-installed coupling bolt disassembly device provided by the embodiment of the utility model is intended to stretch the cold-installed coupling bolt process;

[0031] Figure 6 A schematic diagram of disassembling a locking nut, a screw rod, and a hollow plunger hydraulic cylinder in a marine cold-installed coupling bolt disassembly device provided by an embodiment of the utility model;

[0032] Figure 7 A schematic diagram of disassembling a connecting nut and a supporting tube in a marine cold-installed coupling bolt disassembly device provided by an embodiment of the utility model;

[0033] Figure 8 A schematic diagram of removing a cold-installed coupling bolt from a marine cold-installed coupling bolt disassembly device provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0034] First of all, it should be noted that the specific structure, features and advantages of the present invention will be specifically described below by way of example, but all descriptions are only for illustration and should not be understood as limiting the present invention in any way. In addition, any single technical feature described or implied in the embodiments mentioned herein can still be combined or deleted between these technical features (or their equivalents) to obtain more other embodiments of the present invention that may not be directly mentioned in this article.

[0035] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0036] like Figure 1 As shown, the utility model provides a marine cold-installed coupling bolt disassembly device, comprising a support tube 2, a connecting nut 3, a screw rod 4, a hollow plunger hydraulic cylinder 7, and a locking nut 8;

[0037] The two ends of the inner diameter of the connecting nut 3 are respectively provided with two kinds of internal threads, one end of which is connected to the cold-mounted coupling bolt 10 through the internal thread, and the other end is connected to the screw rod;

[0038] The support tube 2 is sleeved on the outside of the connecting nut 3, and one end of the support tube 2 is in contact with the shaft flange 9, and the other end is in contact with the hollow plunger hydraulic cylinder 7;

[0039] One end of the screw rod is connected to the connecting nut 3, and the other end passes through the support tube 2 and the hollow plunger hydraulic cylinder 7 in sequence, and the locking nut 8 is installed on the side of the screw rod outside the hollow plunger hydraulic cylinder 7;

[0040] In the initial state of removing the coupling bolt, the locking nut 8 is located at the end of the plunger rod of the hollow plunger hydraulic cylinder 7 in the non-working state.

[0041] It should be noted that when the coupling bolt is removed, there is no contact between the support tube 2 and the connecting nut 3, and there is no contact between the hollow plunger hydraulic oil cylinder 7 and the screw rod. In specific operations, it can be considered to fix a lifting ring 5 on the outer wall of the support tube 2 and the hollow plunger hydraulic oil cylinder 7, and use the lifting ring on the support tube 2 as a lifting point to adjust the gap between the support tube and the connecting nut 3, and use the lifting ring on the hollow plunger hydraulic oil cylinder 7 as a lifting point to adjust the gap between the hollow plunger hydraulic oil cylinder 7 and the screw rod; wherein, the lifting ring 5 can be made of ordinary round steel and welded to the support tube 2 and the hollow plunger hydraulic oil cylinder 7. The hollow plunger hydraulic cylinder 7 can also facilitate the extraction of the support tube 2 and the hollow plunger hydraulic cylinder 7; of course, in order to make it more convenient and accurate to adjust the gap between the support tube and the connecting nut 3, and the gap between the hollow plunger hydraulic cylinder 7 and the screw rod, it can be considered that the lifting rings 5 ​​on the outer walls of the support tube 2 and the hollow plunger hydraulic cylinder 7 are at least one pair, and by hanging a pair of lifting rings 5 ​​on the support tube 2 or the hollow plunger hydraulic cylinder 7, the adjustment of the gap between the support tube and the connecting nut 3, and the gap between the hollow plunger hydraulic cylinder 7 and the screw rod can be achieved faster and better.

[0042] In addition, it is necessary to consider that a support tube gasket 1 is fixedly installed at one end of the support tube 2, and the support tube 2 is in contact with the shaft flange 9 through the support tube gasket 1; in the present embodiment, the support tube gasket 1 can be made of ordinary steel plate and welded to the support tube 2 to protect the outer surface of the shaft flange 9 from being damaged; in addition, it also includes a hydraulic cylinder gasket 6, which is fixedly installed at the end of the support tube 2, and the end of the hollow plunger hydraulic cylinder 7 is in contact with the hydraulic cylinder gasket 6. In the present embodiment, the hydraulic cylinder gasket is made of ordinary carbon steel, and its function is to increase the force-bearing area at the bottom of the hollow plunger hydraulic cylinder 7 to prevent it from being damaged; of course, a rotating operation hole is set on the outer wall of the connecting nut 3. In the present embodiment, the connecting nut 3 can be made of high-strength carbon steel, and the outer side is provided with a rotating operation hole for convenient tightening using tools.

[0043] In detail, as an example, in the present embodiment, the support tube 2 in the marine cold-mounted coupling bolt disassembly device is made of high-strength carbon steel tube, which is welded and connected to the support tube gasket 1 and the lifting ring 5, and the jacking force generated by the hollow plunger hydraulic cylinder 7 is reacted on the shaft flange 9; the screw rod 4 is made of high-strength carbon steel, one end of which is connected to the connecting bolt 3, and the other end is connected to the locking nut 8, so as to transfer the jacking force generated by the hollow plunger hydraulic cylinder 7 to the cold-mounted coupling bolt 10; the locking nut 8 is made of high-strength carbon steel and is installed in conjunction with the screw rod 4 to transfer the jacking force of the hollow plunger hydraulic cylinder 7 to the screw rod 4; the hollow plunger hydraulic cylinder 7 is a purchased part and is the power source of the entire device; in addition, the connecting nut 3 and the cold-mounted coupling bolt 10 should be backed off half a turn after being tightened, and the connecting nut 3 and the screw rod 4 should be backed off half a turn after being tightened, so as to facilitate later disassembly.

[0044] The method for removing the ship's cold-installed coupling bolts by using the above-mentioned ship's cold-installed coupling bolt removal device comprises the following steps:

[0045] Install one end of the connecting nut 3 on the cold-mounted coupling bolt 10, and after tightening the connecting nut, back off the connecting nut by half a turn; then install the other end of the connecting nut 3 on the screw rod 4, and after tightening the screw rod, back off the screw rod by half a turn. The above backing off by half a turn is to prevent the thread gap of the device from becoming smaller in the working state, and the thread fit is too tight, which is not conducive to subsequent disassembly. Figure 2 As shown;

[0046] The support tube 2 is put on the connecting nut 3 through the screw rod 4, and an external force is applied to the lifting ring 5 to prevent the support tube 2 and the connecting nut 3 from contacting each other. Figure 3 As shown;

[0047] The hollow plunger hydraulic cylinder 7 is passed through the screw rod 4 so that one end of it contacts the support tube 2. External force is applied to the lifting ring on the hollow plunger hydraulic cylinder 7, and there is no contact between the screw rod 4 and the hollow plunger hydraulic cylinder 7. Figure 4 As shown;

[0048] A locking nut 8 is installed at the end of the screw rod 4, and the locking nut 8 is located at the end of the plunger rod of the hollow plunger hydraulic cylinder 7 that is not in operation;

[0049] Start the hollow plunger hydraulic cylinder 7, and pull out the cold-installed coupling bolt 10 through the locking nut 8, the screw rod 4, and the connecting nut 4. Figure 5 As shown;

[0050] Disassemble the locking nut 8, the hollow plunger hydraulic cylinder 7, and the screw rod 4 respectively. Figure 6 As shown;

[0051] Disassemble the support tube 2 and the connecting nut 3 respectively. Figure 7 As shown;

[0052] Remove the cold-installed coupling bolts 10 from the bolt holes of the shaft flange 9 to complete the entire disassembly process. Figure 8 shown.

[0053] The utility model discloses a marine cold-installed coupling bolt disassembly device, one end of a connecting nut is connected to the marine cold-installed coupling bolt, and the other end is connected to the stretching screw rod. After the support tube is installed, the hollow plunger hydraulic cylinder is inserted into the stretching screw rod, and a locking nut is installed on the top of the stretching screw rod. Then, the cold-installed bolt disassembly is completed by lifting the hollow plunger hydraulic cylinder, so that the cold-installed bolt disassembly device has a simple structure, and the installation and use processes are very convenient. In addition, the marine cold-installed coupling bolt disassembly device only generates axial tension with the coupling bolt during operation, and the tension is uniform, which can better ensure that the coupling bolt and the flange hole will not be damaged during the construction process. In actual application, the marine cold-installed coupling bolt disassembly device only needs to change the size of the connecting bolt to adapt to cold-installed coupling bolts of various specifications, and can be reused many times, so it is highly practical.

[0054] The above embodiments describe the present invention in detail, but the above contents are only preferred embodiments of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of application of the present invention shall still fall within the scope of the patent coverage of the present invention.

Claims

1. Marine cold-installed coupling bolt removal device, characterized by: It comprises a support tube (2), a connecting nut (3), a screw rod (4), a hollow plunger hydraulic cylinder (7), and a locking nut (8); The two ends of the inner diameter of the connecting nut (3) are respectively provided with two kinds of internal threads, one end of which is connected to the cold-mounted coupling bolt (10) through the internal thread, and the other end is connected to the screw rod; The support tube (2) is sleeved on the outside of the connecting nut (3), and one end of the support tube (2) is in contact with the shaft flange (9), and the other end is in contact with the hollow plunger hydraulic cylinder (7); One end of the screw rod is connected to the connecting nut (3), and the other end passes through the support tube (2) and the hollow plunger hydraulic cylinder (7) in sequence, and the locking nut (8) is installed on the side of the screw rod located outside the hollow plunger hydraulic cylinder (7); Furthermore, in the initial state of removing the coupling bolt, the locking nut (8) is located at the end of the plunger rod of the hollow plunger hydraulic cylinder (7) in a non-working state.

2. The marine cold-installed coupling bolt removal device according to claim 1, characterized in that: When the coupling bolt is removed, there is no contact between the support tube (2) and the connecting nut (3), and there is no contact between the hollow plunger hydraulic cylinder (7) and the screw rod.

3. The marine cold-installed coupling bolt removal device according to claim 1, characterized in that: A support tube gasket (1) is fixedly mounted on one end of the support tube (2), and the support tube (2) is in contact with the shaft flange (9) through the support tube gasket (1).

4. The marine cold-installed coupling bolt removal device according to claim 1, characterized in that: It also includes a hydraulic cylinder pad (6), which is fixedly mounted on the end of the support tube (2), and the end of the hollow plunger hydraulic cylinder (7) is in contact with the hydraulic cylinder pad (6).

5. The marine cold-installed coupling bolt removal device according to claim 1, characterized in that: A rotation operation hole is arranged on the outer wall of the connecting nut (3).

6. The marine cold-installed coupling bolt removal device according to claim 1, characterized in that: Lifting rings (5) are fixedly arranged on the outer walls of the support tube (2) and the hollow plunger hydraulic cylinder (7).

7. The marine cold-installed coupling bolt removal device according to claim 1, characterized in that: The lifting rings (5) on the outer walls of the support tube (2) and the hollow plunger hydraulic cylinder (7) are at least one pair.

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