Marine diesel engine rack side plate bolt mounting and aligning device

Abstract

The invention belongs to marine diesel engine assembly, and particularly relates to a marine diesel engine rack side plate bolt mounting and aligning device. The device comprises a steel pipe which is vertically arranged and used for inserting a to-be-installed bolt, and a supporting structure which is arranged on the outer side wall of the steel pipe and used for adjusting the perpendicularity between the to-be-installed bolt and a rack side plate where the to-be-installed bolt is installed. The lower end face of the steel pipe is not in contact with and parallel to the connecting face of the rack side plate and the to-be-installed bolt. The bottom face of the supporting structure makes contact with and is coplanar with the connecting face of the machine frame side plate and the to-be-installed bolt. The distance from the lower end face of the steel pipe to the upper surface of the rack side plate is larger than that from the bottom face of the supporting plate to the upper surface of the rack side plate. Automatic vertical positioning of the bolt is achieved through the combined structure of the steel pipe and the supporting plate, repeated measurement is not needed, the structure is simple, efficiency is high, precision is stable, and the device is particularly suitable for large-scale installation of small cylindrical bolts.

Description

Technical Field

[0001] The present invention belongs to the assembly of marine diesel engines, and particularly relates to a device for adjusting and installing bolts on the side plates of the frame of a marine diesel engine. Background Art

[0002] The installation of bolts on the side plates of the frame of a marine diesel engine is a key process in shipbuilding. The traditional method relies on manual use of a square to repeatedly measure the perpendicularity of the bolts. Since each side plate needs to install about 100 bolts, each bolt needs to be measured and positioned and welded 2 - 3 times and then re - measured, resulting in low construction efficiency and high labor intensity.

[0003] The installation of bolts on the side plates of the frame of a marine diesel engine in the prior art has the following defects: Manual measurement is easily affected by the experience of the operator, and the accuracy fluctuates greatly; Repeated adjustment and welding result in a long process cycle; It is difficult to ensure consistency during batch installation, and cumulative errors are likely to occur. Although some improvement schemes attempt to assist positioning through fixed jigs, there are problems such as poor versatility and inability to adapt to different bolt specifications. Summary of the Invention

[0004] In order to solve the deficiencies of the existing installation methods and devices in the prior art, as well as the problems of a large number of bolts on the side plates of the frame and low installation efficiency, the present invention provides a device for adjusting and installing bolts on the side plates of the frame of a marine diesel engine, which includes a steel pipe (1) vertically arranged for inserting a bolt (4) to be installed, and a support structure arranged on the outer side wall of the steel pipe (1) for adjusting the perpendicularity between the bolt (4) to be installed and the side plate (5) of the frame where the bolt (4) to be installed is to be installed; the lower end surface of the steel pipe (1) does not contact and is parallel to the connection surface between the side plate (5) of the frame and the bolt (4) to be installed; the bottom surface of the support structure contacts and is coplanar with the connection surface between the side plate (5) of the frame and the bolt (4) to be installed; the distance from the lower end surface of the steel pipe (1) to the upper surface of the side plate (5) of the frame is greater than the distance from the bottom surface of the support plate (2) to the upper surface of the side plate (5) of the frame.

[0005] According to the device for adjusting and installing bolts on the side plates of the frame of a marine diesel engine described above, the support structure includes 3 - 4 support plates (2) uniformly and fixedly arranged on the outer side wall of the steel pipe (1); the shape of the support plate (2) is a right - angled triangle or a quadrilateral.

[0006] According to the device for adjusting and installing bolts on the side plates of the frame of a marine diesel engine described above, the inner diameter of the steel pipe (1) is 1.1 - 1.2 times the diameter of the bolt (4) to be installed.

[0007] According to the device for adjusting and installing bolts on the side plates of the frame of a marine diesel engine described above, the thickness of the support plate (2) is 1.2 - 1.5 times the thickness of the side wall of the steel pipe (1).

[0008] According to the marine diesel engine frame side plate bolt installation and adjustment device described above, the perpendicularity between the axis of the steel pipe (1) and the plane formed by the bottom surface of the support plate (2) being coplanar is less than 0.1 mm.

[0009] According to the marine diesel engine frame side plate bolt installation and adjustment device described above, the parallelism of the plane formed by the bottom surfaces of the support plates (2) being coplanar is less than 0.1 mm.

[0010] According to the marine diesel engine frame side plate bolt installation and adjustment device described above, the bottom surface of the support plate (2) is provided with anti-slip patterns.

[0011] According to the marine diesel engine frame side plate bolt installation and adjustment device described above, the distance from the lower end surface of the steel pipe (1) to the upper surface of the frame side plate (2) is 1 mm - 20 mm greater than the distance from the support plate (2) to the upper surface of the frame side plate (200).

[0012] According to the marine diesel engine frame side plate bolt installation and adjustment device described above, the inner wall of the steel pipe (1) is coated with a lubricating oil layer.

[0013] According to the marine diesel engine frame side plate bolt installation and adjustment device described above, the outer side wall of the steel pipe (1) and the support plate (2) are connected by a full welding process.

[0014] The beneficial effects of the present invention are as follows:

[0015] By designing an adjustment device with a simple structure and strong adaptability, the present invention realizes automatic vertical positioning of bolts by using the combined structure of a steel pipe and a support plate, without repeated measurement, effectively solving the technical bottleneck of low efficiency and unstable precision in traditional methods, and is particularly suitable for the large-scale installation scenario of small cylindrical bolts. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the marine diesel engine frame side plate bolt installation and adjustment device of the present invention.

[0017] Figure 2 It is a schematic diagram of the usage method of the marine diesel engine frame side plate bolt installation and adjustment device of the present invention.

[0018] In the figure: 1 - steel pipe, 2 - support plate, 3 - installation adjustment device, 4 - bolt to be installed, 5 - side plate. DETAILED DESCRIPTION OF THE INVENTION

[0019] PREFERRED EMBODIMENT

[0020] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the protection scope of the present application.

[0021] As Figure 1 , Figure 2 shown: In this embodiment, a bolt installation and adjustment device for the side plate of a marine diesel engine frame includes a steel pipe 1 vertically arranged for inserting a bolt 4 to be installed, and a support structure arranged on the outer side wall of the steel pipe 1 for adjusting the perpendicularity between the bolt 4 to be installed and the side plate 5 of the frame where the bolt 4 to be installed is installed; the lower end surface of the steel pipe 1 does not contact and is parallel to the connection surface between the side plate 5 of the frame and the bolt 4 to be installed; the bottom surface of the support structure contacts and is coplanar with the connection surface between the side plate 5 of the frame and the bolt 4 to be installed; the distance from the lower end surface of the steel pipe 1 to the upper surface of the side plate 5 of the frame is greater than the distance from the bottom surface of the support plate 2 to the upper surface of the side plate 5 of the frame.

[0022] The support structure includes 3 - 4 support plates 2 uniformly and fixedly arranged on the outer side wall of the steel pipe 1; the shape of the support plate 2 is a right triangle or a quadrilateral. The inner diameter of the steel pipe 1 is 1.1 - 1.2 times the diameter of the bolt 4 to be installed. The thickness of the support plate 2 is 1.2 - 1.5 times the side wall thickness of the steel pipe 1. The perpendicularity between the axis of the steel pipe 1 and the plane formed by the bottom surfaces of the support plates 2 being coplanar is less than 0.1 mm.

[0023] The parallelism of the plane formed by the bottom surfaces of the support plates 2 being coplanar is less than 0.1 mm. The bottom surface of the support plate 2 is provided with anti - slip patterns. The distance from the lower end surface of the steel pipe 1 to the upper surface of the side plate 2 of the frame is 1 mm - 20 mm greater than the distance from the support plate 2 to the upper surface of the side plate 200 of the frame. The inner wall of the steel pipe 1 is coated with a lubricating oil layer. The outer side wall of the steel pipe 1 and the support plate 2 are connected by a full - welding process.

[0024] The bolt installation and adjustment device for the side plate of the marine diesel engine frame in this embodiment is composed of a steel pipe 1 and 3 support plates 2. The steel pipe 1 is made of seamless carbon steel pipe, and its inner diameter is 0.5 - 1 mm larger than the diameter of the bolt 4 to be installed. When installing an M16 bolt in this embodiment, the inner diameter of the steel pipe 1 is 16.5 mm, and the length of the steel pipe 1 is 50 mm. The support plate 2 is a triangular steel plate, with its length × width × thickness = 30 mm × 15 mm × 5 mm, and is evenly distributed and welded along the outer circumference of the steel pipe 1 at 120°. After welding, grinding is carried out to ensure that the flatness error of the bottom surface of the support plate 1 is ≤0.1 mm. The distance from the lower end surface of the steel pipe 1 to the upper surface of the side plate 5 of the frame is 2 mm greater than the distance from the bottom surface of the support plate 2 to the upper surface of the side plate 5 of the frame, forming a positioning gap to facilitate the contact between one end surface of the bolt 4 to be installed and the side plate 5 of the frame.

[0025] Installation steps:

[0026] First, prepare for positioning: Mark the installation positions of the bolts 4 to be installed on the surface of the side plate 5 of the frame according to the drawing, and clean the welding area;

[0027] Then, place the installation and adjustment device 3 at the marked points, and make the bottom surface of the support plate 2 fit the side plate 5 of the frame;

[0028] Next, insert the bolts 4 to be installed: Insert one end of the bolts 4 to be installed into the steel pipe 1 until the end surface of the bolts 4 to be installed contacts the side plate 5 of the frame;

[0029] Then, position and weld: Perform three-point positioning welding at the contact between the bolts 4 to be installed and the side plate 5 of the frame, and the length of each weld is ≤3 mm;

[0030] Finally, install the adjustment device 3: Gently tap the installation and adjustment device 3 to make it separate from the bolts 4 to be installed, and complete the final full welding.

[0031] In this embodiment: A 15° chamfer for guiding is machined at the top end of the steel pipe 1 to facilitate the rapid insertion of the bolts 4; Cross-grid patterns are laser engraved on the bottom surface of the support plate 2 to enhance the friction with the side plate 5 of the frame; Both the steel pipe 1 and the support plate 2 are galvanized to improve corrosion resistance.

[0032] When using the present invention for installation operations, it is necessary to check the perpendicularity between the support plate 2 and the steel pipe 1 before welding and calibrate it regularly; After positioning welding, it is necessary to visually confirm that the bolts 4 to be installed are not offset before removing the installation and adjustment device 3; When storing the installation and adjustment device 3, it is necessary to avoid collision to cause structural deformation.

[0033] In the installation of the side plate of the diesel engine frame in a shipyard, after using this device, the installation time of a single bolt is shortened from 5 minutes by the traditional method to 1.5 minutes, and the perpendicularity qualification rate is increased from 87% to 99.6%. The device can be reused more than 200 times and is suitable for M12 - M24 bolts, significantly reducing the tool replacement frequency.

[0034] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered within the protection scope of the present invention.

Claims

1. A bolt installation and adjustment device for a side plate of a marine diesel engine frame, characterized in that: The invention comprises a vertically arranged steel pipe (1) for inserting a bolt (4) to be installed, and a support structure arranged on the outer wall of the steel pipe (1) for adjusting the verticality between the bolt (4) to be installed and the frame side plate (5) to which the bolt (4) is installed; the lower end surface of the steel pipe (1) is not in contact with and is parallel to the connection surface between the frame side plate (5) and the bolt (4) to be installed; the bottom surface of the support structure is in contact with and coplanar with the connection surface between the frame side plate (5) and the bolt (4) to be installed; and the distance from the lower end surface of the steel pipe (1) to the upper surface of the frame side plate (5) is greater than the distance from the bottom surface of the support plate (2) to the upper surface of the frame side plate (5).

2. The marine diesel engine frame side plate bolt installation and adjustment device according to claim 1, characterized in that: The support structure comprises 3-4 support plates (2) which are evenly fixedly arranged on the outer side wall of the steel pipe (1); the shape of the support plates (2) is a right triangle or a quadrilateral.

3. The marine diesel engine frame side plate bolt installation and adjustment device according to claim 2, characterized in that: The inner diameter of the steel pipe (1) is 1.1-1.2 times the diameter of the bolt (4) to be installed.

4. The marine diesel engine frame side plate bolt installation and adjustment device according to claim 3, characterized in that: The thickness of the support plate (2) is 1.2-1.5 times the thickness of the side wall of the steel pipe (1).

5. The marine diesel engine frame side plate bolt installation and adjustment device according to claim 4, characterized in that: The verticality of the plane formed by the axis of the steel pipe (1) and the bottom surface of the support plate (2) is less than 0.1 mm.

6. The marine diesel engine frame side plate bolt installation and adjustment device according to claim 5, characterized in that: The parallelism of the planes formed by the coplanar bottom surfaces of the support plates (2) is less than 0.1 mm.

7. The marine diesel engine frame side plate bolt installation and adjustment device according to claim 6, characterized in that: The bottom surface of the support plate (2) is provided with anti-slip textures.

8. The marine diesel engine frame side plate bolt installation and adjustment device according to claim 7, characterized in that: The distance from the lower end surface of the steel pipe (1) to the upper surface of the frame side plate (2) is 1 mm to 20 mm greater than the distance from the support plate (2) to the upper surface of the frame side plate (200).

9. The marine diesel engine frame side plate bolt installation and adjustment device according to claim 1 or 8, characterized in that: The inner wall of the steel pipe (1) is coated with a lubricating oil layer.

10. The marine diesel engine frame side plate bolt installation and adjustment device according to claim 9, characterized in that: The outer side wall of the steel pipe (1) and the support plate (2) are connected by a full welding process.

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