A kind of marine crankshaft component red sleeve leveling auxiliary protection device

Abstract

The utility model provides a kind of marine crankshaft component red sleeve leveling auxiliary protective device, it is related to marine crankshaft equipment technical field, the protective device is made of single structure of cast iron processing, middle position is equipped with through hole for reducing weight, with two mutually parallel use planes of upper and lower, and the tolerance of two use planes is ±0.02mm.The outer dimension of device is greater than the bottom surface size of level, so that level is placed on protective device to carry out leveling operation.In practical application, protective device is horizontally placed in the 90 ° direction of crank first side, its lower use plane is contacted with crank, and upper use plane is contacted with level, to form the heat insulation and protective structure between heat source and instrument.The utility model utilizes the advantages that cast iron is slow in heat transfer and difficult to deform, solves the hidden danger that crank is easily damaged after being directly contacted and heated by level, protects equipment while ensuring leveling accuracy, and structure is simple, light.

Description

Technical Field

[0001] This utility model relates to the technical field of marine crankshaft equipment, and more specifically, to a leveling auxiliary protection device for marine crankshaft components. Background Technology

[0002] The large semi-assembled marine crankshaft is one of the most crucial components of a low-speed, high-horsepower diesel engine. A semi-assembled crankshaft consists of several parts: crankshaft, journal, thrust shaft, and flange shaft. In practice, after rough machining of each part, a "red sleeve" method is often used to connect the various parts of the diesel engine crankshaft. The red sleeve method utilizes the principle of thermal expansion and contraction of metals. The crankshaft's red sleeve hole is heated and expanded to exceed the journal's diameter by 1.5mm. The journal and crankshaft are then leveled, and the journal is placed into the crankshaft's red sleeve hole. After the crankshaft's red sleeve hole cools, the journal is tightened.

[0003] The assembly process requires first assembling the intermediate shaft and the corresponding crank separately. First, heat and expand the size of the red sleeve hole of the crank to exceed the size of the red sleeve journal by 1.5mm. Then, with the journal of the shaft to be assembled facing down, lift it vertically. Use a level to adjust the intermediate shaft and the red sleeve hole on the side to be assembled to be perpendicular to the horizontal plane (within 0.05mm / m). Slowly lift the intermediate shaft to directly above the hole and slowly lower it until the assembly is completed.

[0004] Before assembly, the crankshaft needs to be leveled and aligned using a level. However, directly contacting the level with the heated crankshaft arm can easily damage the machine. Therefore, a safe, lightweight protective device that can also assist in the leveling of the crankshaft sleeve is urgently needed. Utility Model Content

[0005] To address the aforementioned technical problems, this invention provides an auxiliary protective device for leveling the red sleeve of a marine crankshaft component. This invention utilizes a high-precision cast iron block with through holes, placed between the heated crank and the level, leveraging its slow heat transfer and high precision characteristics to assist in red sleeve leveling.

[0006] To achieve the above objectives, this utility model provides a leveling auxiliary protective device for marine crankshaft components, comprising: a protective device; The protective device consists of a single structure made of cast iron. The protective device has a through hole in the middle to reduce weight; The protective device has two parallel working planes, and the tolerance between the two working planes is ±0.02mm. The protective device is larger than the bottom surface of the level, so that the level can be placed on the protective device for leveling.

[0007] Furthermore, the cast iron material of the protective device constitutes a structure that has slow heat transfer and is not easily deformed.

[0008] Furthermore, the protective device is configured to be placed horizontally at a 90° angle to the first side of the crank.

[0009] Furthermore, the lower part of the protective device contacts the first side of the crank with a flat surface, and the upper part contacts the level with a flat surface, thereby forming a heat insulation and protection structure between the heat source and the instrument.

[0010] By adopting the above technical solution, this utility model has the following advantages compared with the prior art: 1. The present invention provides a leveling auxiliary protection device for a marine crankshaft component, which is made of cast iron material. Taking advantage of its slow heat conduction and resistance to deformation, it forms an effective thermal protection interface between the high-temperature crank arm and the level, avoiding the potential damage caused by the level directly contacting the heated crank arm.

[0011] 2. The present invention provides a leveling auxiliary protective device for marine crankshaft components. The tolerance of the upper and lower working planes of the protective device is strictly controlled within ±0.02mm, ensuring that the leveling result will not be interfered with by the manufacturing error of the protective device itself during use, and meeting the high precision requirements for the levelness of the crankshaft before the red sleeve.

[0012] 3. The present invention provides a leveling auxiliary protective device for marine crankshaft components with a through hole in the middle. While ensuring that its external size is larger than that of a level for easy placement, it effectively reduces the weight of the device, making the device both safe and lightweight, and easy for operators to move and use on the assembly site. Attached Figure Description

[0013] 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 some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the overall structure of the leveling auxiliary protection device for the red sleeve of a marine crankshaft component as described in this utility model; Figure 2 This is a side view of the auxiliary protective device for leveling the red sleeve of a marine crankshaft component as described in this utility model. Figure 3 This is a top view of the auxiliary protective device for leveling the red sleeve of a marine crankshaft component as described in this utility model. Figure 4 This is an application diagram of the leveling auxiliary protection device for the red sleeve of a marine crankshaft component described in this utility model.

[0015] In the diagram: 1. Protective device; 2. Through hole; 3. Lower working plane; 4. Upper working plane; 5. Level; 6. First side; 7. Second side; 8. Leveling shim; 9. Crank. Detailed Implementation

[0016] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this utility model or its application or use. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0018] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0019] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0020] In the description of this utility model, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0021] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0022] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0023] like Figures 1 to 4 As shown, this utility model provides a marine crankshaft component red sleeve leveling auxiliary protection device 1, including: protection device 1; The protective device 1 is a single-unit structure made of cast iron. The single-unit cast iron structure ensures the overall strength and stability of the device. Furthermore, due to the advantages of cast iron, such as slow heat transfer and resistance to deformation, it can maintain stable physical properties when in contact with high-temperature workpieces. A through hole 2 is machined in the middle of the protective device 1. This through hole 2 is specifically designed to reduce the overall weight of the device, making it easier for operators to handle and move it at the assembly site. The protective device 1 has two parallel working planes. To ensure the accuracy of leveling, the tolerance of these two working planes is strictly controlled within ±0.02mm, thereby avoiding the influence of the manufacturing error of the protective device 1 itself on the leveling result. The external dimensions of the protective device 1 are designed to be larger than the bottom dimensions of the level 5, ensuring that the level 5 can be stably placed on its upper working plane 4 for operation.

[0024] In practical application, the second side 7 of crank 9 is first placed flat on three leveling shims 8 (two on the crank arm and one on the crank pin). A heating device is placed on the inner side of crank 9 for heating, and a measuring rod is used to measure the size of the red sleeve hole of crank 9. When the red sleeve hole of crank 9 expands to exceed the size of the red sleeve journal by 1.5mm, the single-piece protective device 1, made of cast iron and with a through hole 2 in the middle, is placed horizontally at 90° to the first side 6 of crank 9, so that its lower part, using the flat surface 3, contacts the first side 6 of crank 9. The external dimensions of the protective device 1 are then utilized. Two parallel working planes larger than the bottom surface of the level 5 and with a tolerance of ±0.02mm are used to place the level 5 on the upper working plane 4 to form a heat insulation and protection structure between the heat source and the instrument. The operator observes the level 5 and uses a hydraulic pump to level the crank 9. After ensuring that the levelness reaches 0.02mm / m, the prepared shaft to be installed is hoisted above the red sleeve hole of the crank 9 and lowered to a position 2mm away from the surface of the crank 9. Finally, two people hold and control the hot-installed shaft to slowly and smoothly descend to a depth of 30mm in the hole and then quickly and smoothly descend until the hot-installed shaft is completely lowered to complete the assembly operation.

[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A leveling auxiliary protective device for a marine crankshaft component, characterized in that, include: Protective devices; The protective device consists of a single structure made of cast iron. The protective device has a through hole in the middle to reduce weight; The protective device has two parallel working planes, and the tolerance between the two working planes is ±0.02mm. The protective device is larger than the bottom surface of the level, so that the level can be placed on the protective device for leveling.

2. The auxiliary protective device for leveling marine crankshaft components according to claim 1, characterized in that, The protective device is made of cast iron, forming a structure that has slow heat transfer and is not easily deformed.

3. The auxiliary protective device for leveling marine crankshaft components according to claim 1, characterized in that, The protective device is configured to be placed horizontally at a 90° angle to the first side of the crank.

4. The auxiliary protective device for leveling marine crankshaft components according to claim 1, characterized in that, The lower part of the protective device contacts the first side of the crank with a flat surface, and the upper part contacts the level with a flat surface, thereby forming a heat insulation and protection structure between the heat source and the instrument.

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