Method for taking out fractured attachment bolt in cylinder body

Abstract

A method for taking out a fractured attachment bolt in a cylinder body comprises the following steps that a, a sleeve and a fracture of the attachment bolt in the cylinder body are connected in a screwed mode through threads, forward threads and reverse threads are machined on the inner wall faces of the two ends of the sleeve respectively, and the forward threads are connected with the attachment bolt; b, the sleeve and the attachment bolt are manually welded at the screwing position through a welding rod, and fixed connection is achieved; c, an auxiliary tool is screwed into the reverse threads, and external threads matched with the reverse threads are machined on the auxiliary tool; d, the auxiliary tool is rotated anticlockwise until the attachment bolt leaves the air cylinder body; the method provided by the scheme is simple to operate, can effectively take out the broken connecting bolt, is suitable for being popularized and applied to maintenance of the marine diesel engine, solves the maintenance cost, reduces the labor force of workers, and ensures good working conditions of power equipment of a ship.

Description

Technical Field

[0001] The invention relates to a method for removing a broken connecting bolt in a cylinder body. Background Art

[0002] The cylinder block and cylinder head of a diesel engine are fastened together by connecting bolts. Impact vibrations caused by abnormal operation of the crankshaft, piston, connecting rod, etc. may sometimes cause the connecting bolts to break in the middle. Connecting bolts are different from ordinary fastening bolts. To ensure the sealing of the cylinder head, the connecting bolts need to withstand the strong air pressure in the diesel engine. At the same time, to prevent the loosening of the connecting bolts and cause accidents, the bolt head at the bottom of the connecting bolt needs to have a very large force to tighten against the screw hole end of the cylinder block. This force is quite large. Once the connecting bolt breaks in the cylinder body, it is basically difficult to remove the broken connecting bolt. If the broken connecting bolt is not removed, the entire diesel engine cannot be used, because once the diesel engine cylinder head has a broken nail, its tightness will definitely not meet the standard, and the clamping force distribution of the entire cylinder head will be uneven. Under the influence of air pressure and vibration during use, oil leakage, air leakage, etc. will occur, and the cost of replacing the entire machine is too expensive. Summary of the invention

[0003] In view of the shortcomings existing in the above problems, the present invention provides a method for removing broken connecting bolts in a cylinder body.

[0004] To achieve the above object, the present invention provides a method for removing a broken connecting bolt in a cylinder body, comprising the following steps:

[0005] a. Screw the sleeve and the broken end of the connecting bolt in the cylinder body together through threads, and process the inner wall surfaces at both ends of the sleeve with positive threads and reverse threads respectively, and the positive threads are connected with the connecting bolts;

[0006] b. Manually welding the sleeve and the connecting bolt at the screw joint by welding rods to achieve a fixed connection;

[0007] c. Screw an auxiliary tool into the reverse thread, wherein the auxiliary tool is processed with an external thread matching the reverse thread;

[0008] d. Rotate the auxiliary tool counterclockwise until the connecting bolt leaves the cylinder body.

[0009] The method is simple to operate and can effectively remove broken connecting bolts. It is suitable for promotion and application in the maintenance of marine diesel engines, thereby solving maintenance costs, reducing the labor of staff, and ensuring the good working condition of the ship's power equipment.

[0010] Preferably, in step a, the length of the sleeve matches the depth of the bolt hole machined on the cylinder block;

[0011] In the above technical solution, the length of the sleeve is consistent with the depth of the bolt hole, which is convenient for the next step of welding and also convenient for screwing it with the auxiliary tool.

[0012] Preferably, in step b, the manual welding method is blind welding, so as to realize circumferential welding between the sleeve and the connecting bolt at the screw connection;

[0013] In the above technical solution, the circumferential welding makes the connection between the sleeve and the connecting bolt very stable and reliable.

[0014] Preferably, in step c and step d, the auxiliary tool comprises a handle for applying force, and the auxiliary tool may be T-shaped or L-shaped;

[0015] In the above technical solution, the connecting bolt can be rotated by applying force through the handle through the sleeve, so that the connecting bolt can be screwed out.

[0016] The beneficial effects of the present invention compared to the prior art are as follows: the method provided by the present invention is simple to operate, can effectively remove broken connecting bolts, is suitable for promotion and application in the maintenance of marine diesel engines, solves maintenance costs, reduces the labor of staff, and ensures the good working condition of the ship's power equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of connecting the cylinder head and the cylinder body with the connecting bolts;

[0018] Figure 2 This is a schematic diagram after the connecting bolt is broken (cylinder head removed);

[0019] Figure 3 A schematic diagram of the auxiliary tool.

[0020] In the figure: 1. cylinder head; 2. connecting bolt; 3. cylinder body; 31. bolt hole; 4. piston; 5. connecting rod; 6. sleeve; 61. reverse thread; 62. forward thread; 7. auxiliary tool; 71. external thread; 72. handle. DETAILED DESCRIPTION

[0021] like Figure 1 , Figure 2 and Figure 3 As shown, a method for removing a broken connecting bolt in a cylinder body according to an embodiment of the present invention comprises the following steps:

[0022] a. Screw the sleeve 6 and the broken end of the connecting bolt 2 in the cylinder body 3 together through threads. The inner wall surfaces at both ends of the sleeve 6 are respectively processed with positive threads 62 and negative threads 61. The positive threads 62 are connected to the connecting bolt 2.

[0023] b. Manually weld the sleeve 6 and the connecting bolt 2 at the screw joint using welding rods to achieve a fixed connection;

[0024] c. Screw the auxiliary tool 7 into the reverse thread 61. The auxiliary tool 7 is processed with an external thread 71 that matches the reverse thread 61;

[0025] d. Turn the auxiliary tool 7 counterclockwise until the connecting bolt 2 leaves the cylinder body 3;

[0026] Among them, in step a, the length of the sleeve 6 matches the depth of the bolt hole 31 processed on the cylinder body 3; in step b, the manual welding method is blind welding to achieve circumferential welding of the sleeve 6 and the connecting bolt 2 at the screw-on joint; in step c and step d, the auxiliary tool 7 includes a handle 72 for applying force, and the auxiliary tool 7 can be T-shaped or L-shaped.

[0027] The method provided by the scheme is simple to operate, and can effectively remove broken connecting bolts. It is suitable for promotion and application in the maintenance of marine diesel engines, thereby solving maintenance costs, reducing the labor of staff, and ensuring the good working condition of the ship's power equipment.

[0028] In order to facilitate the understanding of the present invention, the following description is given in conjunction with the accompanying drawings during specific use;

[0029] The connecting bolts normally connect the cylinder head and the cylinder body. Figure 1 As shown, see Figure 2 , the connecting bolt breaks. After taking out the cylinder head, install the sleeve into the bolt hole 31, with the positive thread of the sleeve facing downward and screwed into the fracture of the connecting bolt. The size of the sleeve matches the depth of the bolt hole. Try to screw the sleeve into place, manually extend the welding rod from the upper part of the sleeve, and perform manual blind welding at the screwing point of the sleeve and the connecting bolt to complete the fixed connection between the sleeve and the connecting bolt. After that, screw the auxiliary tool into the reverse thread, and rotate the auxiliary tool counterclockwise. When the external thread of the auxiliary tool is completely screwed into the reverse thread, continue to rotate the auxiliary tool counterclockwise. The auxiliary tool drives the connecting bolt to rotate counterclockwise through the sleeve, and the positive thread processed on the connecting bolt, that is, during the counterclockwise rotation process, the connecting bolt gradually withdraws and leaves the cylinder body.

[0030] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for removing a broken connecting bolt in a cylinder body, characterized in that: The following steps are involved: a. Screw the sleeve (6) and the broken end of the connecting bolt (2) in the cylinder body (3) together by means of threads, and the inner wall surfaces at both ends of the sleeve (6) are respectively processed with positive threads (62) and reverse threads (61), and the positive threads (62) are connected to the connecting bolt (2); b. Manually welding the sleeve (6) and the connecting bolt (2) at the screw connection using welding rods to achieve a fixed connection; c. Screw the auxiliary tool (7) into the reverse thread (61), wherein the auxiliary tool (7) is processed with an external thread (71) matching the reverse thread (61); d. Rotate the auxiliary tool (7) counterclockwise until the connecting bolt (2) leaves the cylinder body (3).

2. A method for removing a broken connecting bolt in a cylinder block according to claim 1, characterized in that: In step a, the length of the sleeve (6) matches the depth of the bolt hole (31) machined on the cylinder block (3).

3. A method for removing a broken connecting bolt in a cylinder block according to claim 1, characterized in that: In step b, the manual welding method is blind welding, which realizes circumferential welding between the sleeve (6) and the connecting bolt (2) at the screw connection.

4. A method for removing a broken connecting bolt in a cylinder block according to claim 1, characterized in that: In step c and step d, the auxiliary tool (7) comprises a handle (72) for applying force, and the auxiliary tool (7) may be T-shaped or L-shaped.

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