Protective cover for through bolt

Abstract

The through bolt protection cover is provided with a cover shell and an eyebolt, the cover shell is formed by welding a round barrel and a top cover plate at the upper end of the round barrel, a round hole is drilled in the middle of the top cover plate, a hoisting bolt penetrates through the round hole from the upper portion and is welded in the round hole of the round top cover plate, and a threaded hoisting hole is formed in the right center of a nut of the hoisting bolt. The protective cover for the low-speed diesel engine has the advantages that the protective cover is light in piece weight and convenient to carry manually, and a hoisting hole with a thread is formed in the center of a nut of the hoisting bolt. And the assembling speed is increased, and the assembling efficiency is improved.

Description

Technical Field

[0001] The invention relates to the field of safety protection of the end of a through bolt of a host component, and protects the end of the through bolt from being damaged. Meanwhile, a lifting bolt is provided on the top of the protective cover, which is convenient for hoisting during installation and transportation. Background Art

[0002] After the through bolts of large low-speed marine diesel engines are installed, the upper end is exposed to the outside. During the operation of the ship, during maintenance or operation, it is easy to bump the end thread of the through bolt. If the through end thread is damaged, the hydraulic tensioner cannot be used when disassembling and installing the through bolt again, resulting in the through bolt being unable to be sent down or tightened. Since the through bolts of large low-speed diesel engines have a relatively large diameter, and the protective cover of the through bolts has a large diameter and a heavy weight, it is very difficult for construction workers to install them. Summary of the invention

[0003] In order to solve the above problems, the present invention provides a through-bolt protective cover, characterized in that: there is a cover shell and a hanging bolt, the cover shell is welded by a circular barrel (2) and a top cover plate (1) at the upper end of the circular barrel, a round hole is drilled in the middle of the top cover plate, the hanging bolt passes through the round hole from above and is welded in the round hole of the circular top cover plate, and a threaded hanging hole is opened in the center of the nut of the lifting bolt (3). The upper part is provided with a hanging bolt through-bolt protective cover, and according to the different sizes of the through-bolts of the main machine, protective covers with different sizes of through-bolts are designed and installed on main machines with different cylinder diameters. This through-bolt protective cover greatly improves the installation efficiency.

[0004] The through-bolt protective cover of the present invention is further improved (see the attached drawings), comprising a circular barrel (1), a top cover plate (2), and a hanging bolt (3), characterized in that: the circular barrel (1) is formed by cutting a barrel-shaped plate according to the required size, the top cover plate (2) is a circular plate with a thickness of 9 mm, and the circular barrel (1) and the top cover plate (2) are welded together. The hanging bolt welded on the top cover plate passes through a circular hole with a diameter of 39 mm, (3) the hanging bolt is welded to the circular hole with a diameter of 39 mm, and the lower end of the bolt is screwed into the screw hole at the top of the through-bolt during installation to fix the protective cover, so that the protective cover does not loosen or fall off during the operation of the ship. (3) In order to enable hanging, an M16-20 / 30 threaded hole is drilled in the center of the eyebolt nut. The threaded hanging hole is equipped with a bolt hanging ring, the upper section of the bolt hanging ring is a hanging ring, and the lower section is a bolt that matches the thread of the hanging hole. The top cover plate (1) is a circular plate with a circular hole with a diameter of 39 mm drilled in the middle. The round barrel (2) is formed by bending a 6.3mm thick plate into a round barrel shape with a diameter of 273mm and welding the butt joint; the hanging bolt (3) is a bolt of M36mm. The through-bolt protection cover mainly solves the problem of protecting the through-bolts of large low-speed diesel engines. At the same time, the design of the hanging eye bolt solves the problem that the protective cover is too heavy and inconvenient to install. The hanging bolt is used and the crane is used for lifting and transportation, which completely solves this problem.

[0005] The design of the through bolt protection cover is mainly composed of the cover shell and the lifting bolts welded together. According to this design and requirements, the protection cover is made into different diameters and heights according to the penetration size of different models, which is suitable for models with various cylinder diameters. According to the through bolt size of the main engine with different cylinder diameters, under the condition of meeting the space requirements and the weight of the protection cover and lifting safety, the design method of bolt fixing from below and lifting from above is adopted, which is flexible in operation and reduces manufacturing costs, and the various components of the through bolt protection cover are designed. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 is a schematic diagram of a through bolt protective cover installed on a through bolt;

[0007] Figure 2 It is a schematic diagram of the main cross-sectional view and top view of the finished through-bolt protection cover;

[0008] There are three parts in the finished main section view:

[0009] (1) is the top cover of the protective cover, and a circular hole with a diameter of 39 mm is opened in the middle of the top cover;

[0010] (2) The main cylinder of the protective cover is 500 mm high and 273 mm in diameter;

[0011] (3) is a standard hexagonal bolt with an M16 threaded hole drilled on the outer hexagon of the bolt for hoisting the cover. DETAILED DESCRIPTION

[0012] The present invention will be further described with reference to the accompanying drawings. Figure 1 The penetration protection cover of the present invention shown in the figure is composed of a top cover plate (1), a circular barrel (2) and hanging bolts (3).

[0013] Cut a circular plate with a diameter of 280mm from a Q235 plate, and cut a circular hole with a diameter of 39mm in the center of the plate for welding the hanging bolts. Cut a barrel body with a height of 500mm from a finished pipe with a diameter of 273mm from a Q235 material. Use a standard M36X60 bolt to drill an M16-20 / 30 threaded hole in the middle of the outer hexagon. Weld the cut top cover plate (1) to the top of the circular barrel body (2). Then pass the hanging bolt (3) through and weld it into the circular hole of the top cover plate (1) as shown in the figure.

[0014] According to the size and design parameters of the through bolts of a certain model, a through bolt protection cover for a certain model of main engine is made, and it is installed according to the installation requirements and used normally when the main motor vehicle is in operation.

[0015] The method of using the present invention is as follows: after the through bolts of the main machine are installed and pulled in, the protective cover is hoisted by means of the through bolts and the hoisting bolts, the through bolt protective cover is placed on the upper end of the through bolts, and then the hoisting bolts are screwed into the threaded holes at the tops of the through bolts to ensure that the protective cover does not vibrate or loosen when the main machine is running.

[0016] The through bolt protective cover designed by the present invention was not found to be loose or inappropriate in the bench test. According to the continuous upgrading of the main engine models built by the company and the continuous expansion of the cylinder diameter range of the main engine built, the design of the through bolt protective cover will also be designed for each model. It is ensured that the through bolt protective cover used by various main engines is economical and practical. The design of the through bolt protective cover provides the company's independent design capabilities, while improving the assembly efficiency of the main engine parts and reducing the time cost of the main engine construction.

Claims

1. A through bolt protection cover, comprising a cover and an eye bolt, characterized in that: The cover shell is welded by a circular barrel (2) and a top cover plate (1) at the upper end of the circular barrel. A circular hole is drilled in the middle of the top cover plate. A hanging bolt passes through the circular hole from above and is welded in the circular hole of the circular top cover plate. A threaded hanging hole is opened in the center of the nut of the hanging bolt (3).

2. The through bolt protection cover according to claim 1, characterized in that: The top cover plate (1) has a diameter of 280 mm and a central circular hole with a diameter of 39 mm.

3. The through bolt protective cover according to claim 1 or 2, characterized in that: The round barrel (2) has a diameter of 273 mm and a height of 500 mm.

4. The through bolt protective cover according to claim 1 or 2, characterized in that: The lifting hole in the center of the lifting bolt (3) is M16mm-20 / 32.

5. The through bolt protection cover according to claim 3, characterized in that: The lifting hole in the center of the lifting bolt (3) is M16mm-20 / 32.

6. The through bolt protection cover according to claim 1 or 2, characterized in that: The top cover plate (1) is a circular plate with a circular hole of 39 mm in diameter drilled in the middle.

7. The through bolt protection cover according to claim 5, characterized in that: The top cover plate (1) is a circular plate with a circular hole of 39 mm in diameter drilled in the middle.

8. The through bolt protection cover according to claim 1 or 2, characterized in that: The round barrel (2) is formed by bending a 6.3 mm thick plate into a round barrel shape with a diameter of 273 mm and welding the butt joints; the hanging bolts (3) are M36 mm bolts.

9. The through bolt protection cover according to claim 1 or 2, characterized in that: The threaded lifting hole is equipped with a bolt lifting ring, the upper part of the bolt lifting ring is a lifting ring, and the lower part is a bolt that matches the thread of the lifting hole.

10. The through bolt protection cover according to claim 8, characterized in that: The threaded lifting hole is equipped with a bolt lifting ring, the upper part of the bolt lifting ring is a lifting ring, and the lower part is a bolt that matches the thread of the lifting hole.

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