Hoisting device for hoisting marine crankshaft

Abstract

The hoisting device comprises a hoisting shaft, a safety anti-channeling clamping flange, a baffle, a hoisting ring nut and a screw, the hoisting shaft is integrally in a hollow cylinder shape, the outer diameter of the hoisting shaft is slightly smaller than that of a crankshaft center hole, guiding conical slopes are arranged at the positions, close to the two ends, of the outer circle of the hoisting shaft respectively, and the safety anti-channeling clamping flange is arranged on the hoisting shaft. The hoisting shaft can conveniently move to a designated position in a central through hole of the crankshaft, and two positioning grooves which are slightly lower than the axial surface are reserved in the middle of the outer circle of the hoisting shaft; the positioning groove is used for installing and fixing the safe anti-channeling clamping flange. The two positioning grooves which are slightly lower than the axial surface are reserved in the middle of the outer circle of the hoisting shaft, and the safe anti-channeling clamping flanges are installed and fixed, so that the hidden dangers of axial channeling of the hoisting shaft and extrusion breakage of a hoisting belt are prevented, and safe hoisting is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical processing, and in particular to a lifting device for lifting a marine crankshaft. Background Art

[0002] The total weight of a large crankshaft is 300t and the length is 15.5 meters. The lifting device needs to be installed at two designated positions in the crankshaft center through hole during factory and transportation hoisting. The lifting device of previous products is designed as a solid cylinder with an outer diameter slightly smaller than the crankshaft center through hole. The overall length exceeds the crank inner gear by 300-400mm. A positioning key with the same width as the crank inner gear is installed in the middle position to prevent the lifting device from axial movement in the crankshaft and ensure the safety of hoisting. With the increase of crankshaft models, the specifications of the through hole in the center of the crankshaft increase to 300mm. After evaluation, the lifting device needs to be 190mm in diameter, 680mm in length, and 151kg in weight to meet the hoisting requirements of this type of crankshaft. Due to the heavy weight, the personnel were unable to complete the installation of the lifting device. At the same time, the diameter of the lifting device was too different from the diameter of the crankshaft center through hole. During hoisting, the sling is easily squeezed between the lifting device and the crankshaft center through hole, causing the sling to break, posing a safety hazard. Summary of the invention

[0003] In view of the technical problem that the lifting device is prone to the sling being squeezed between the lifting device and the central through hole of the crankshaft during lifting, causing the sling to break, a lifting device for marine crankshaft lifting is provided. The utility model provides two positioning grooves slightly lower than the shaft surface in the middle of the outer circle of the lifting shaft and installs and fixes the safety anti-slip clamps to prevent the axial movement of the lifting shaft and the hidden danger of squeezing the sling, thereby achieving safe lifting.

[0004] The technical means adopted by the utility model are as follows:

[0005] A lifting device for marine crankshaft hoisting, comprising: a hoisting shaft, a safety anti-slip collar, a baffle, a lifting eye nut, and a screw;

[0006] The hoisting shaft is in the shape of a hollow cylinder as a whole, and its outer diameter is slightly smaller than the center hole of the crankshaft. The outer circle of the hoisting shaft is provided with guiding conical slopes near both ends to facilitate moving to the designated position in the center through hole of the crankshaft.

[0007] Two positioning grooves slightly lower than the shaft surface are reserved in the middle of the outer circle of the lifting shaft; the positioning grooves are used to install and fix the safety anti-collision calliper.

[0008] Furthermore, the safety anti-collision calliper is composed of two semicircular rings, the upper semicircular rings of the two semicircular rings are provided with steps, and the step surfaces are provided with through holes;

[0009] The two semicircular rings have threaded holes on their end faces symmetrical to the upper semicircle for installing screws. After assembly, their inner circles match the outer diameter of the groove on the lifting shaft, and their outer circle size needs to be larger than the diameter of the crankshaft center hole, which can prevent the lifting shaft from moving.

[0010] Furthermore, the baffle is welded to the center position of the end surfaces on both sides of the lifting shaft, and a thread hole is provided at the center position of the baffle for installing a lifting eye nut.

[0011] Furthermore, a rope is tied to the lifting ring of the lifting ring nut for disassembling or adjusting the lifting shaft.

[0012] Due to the adoption of the above technical solution, compared with the prior art, the utility model has the following advantages:

[0013] 1. The utility model provides a lifting device for marine crankshaft hoisting, which has reasonable design, simple structure, light weight and is convenient for on-site operation.

[0014] 2. The utility model provides a lifting device for marine crankshaft hoisting, which can eliminate the hidden dangers of axial movement of the hoisting shaft and breaking of the lifting belt, thereby achieving safe hoisting.

[0015] Based on the above reasons, the utility model can be widely promoted in the field of mechanical processing technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0017] Figure 1 This is a structural schematic diagram of a lifting device for lifting a marine crankshaft according to the utility model;

[0018] Figure 2 This is a front view of the lifting shaft structure of a lifting device for lifting a marine crankshaft according to the utility model;

[0019] Figure 3 This is a front view of a baffle of a lifting device for lifting a marine crankshaft according to the utility model;

[0020] Figure 4 This is a relative position diagram of welding of a lifting shaft and a baffle of a lifting device for lifting a marine crankshaft described in the utility model;

[0021] Figure 5This is a front view of a safety anti-slip clamp of a lifting device for marine crankshaft hoisting described in the utility model;

[0022] Figure 6 This is an application working condition diagram of a lifting device for marine crankshaft lifting described in the utility model;

[0023] Figure 7 It is an enlarged view of the working condition application of a lifting device for marine crankshaft lifting described in the utility model.

[0024] In the figure: 1. Lifting shaft; 2. Safety anti-slip clamp; 3. Baffle; 4. Lifting eye nut; 5. Screw. DETAILED DESCRIPTION

[0025] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0026] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0027] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the utility model. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0028] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, the numerical expressions and numerical values ​​do not limit the scope of the utility model. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0029] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise stated, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present utility model: the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0030] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below their position devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0031] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0032] like Figures 1 to 7 As shown, the utility model provides a lifting device for marine crankshaft hoisting, comprising: a hoisting shaft 1, a safety anti-slip collar 2, a baffle 3, a lifting eye nut 4, and a screw 5;

[0033] The hoisting shaft 1 is in the shape of a hollow cylinder as a whole, and its outer diameter is slightly smaller than the center hole of the crankshaft. The outer circle of the hoisting shaft 1 is provided with guiding conical slopes near both ends to facilitate moving to the designated position in the center through hole of the crankshaft.

[0034] Two positioning grooves slightly lower than the shaft surface are reserved in the middle of the outer circle of the lifting shaft 1; the positioning grooves are used to install and fix the safety anti-collision clamp 2.

[0035] Furthermore, the safety anti-collision call 2 is composed of two semicircular rings, the upper semicircular rings of the two semicircular rings are provided with steps, and the step surfaces are provided with through holes;

[0036] The two semicircular rings have threaded holes on their end faces symmetrical to the upper semicircle for installing screws 5. After assembly, their inner circles match the outer diameter of the groove on the lifting shaft 1, and their outer circle size needs to be larger than the diameter of the crankshaft center hole, which can prevent the lifting shaft 1 from moving.

[0037] Furthermore, the baffle plate 3 is welded to the center position of the end surfaces on both sides of the lifting shaft 1, and a thread hole is provided at the center position of the baffle plate 3 for installing the lifting eye nut 4.

[0038] Furthermore, a rope is tied to the lifting ring of the lifting ring nut 4 for disassembling or adjusting the lifting shaft 1.

[0039] Furthermore, each crankshaft needs to be equipped with two sets of lifting devices, each set of lifting devices consists of a lifting shaft 1, two safety anti-collision callipers 2, two baffles 3 and two lifting eye nuts 4. The lifting shaft 1 and the baffle 3 are welded together before use, and then the lifting eye nuts 4 at both ends are installed. Use a crane to lift the assembly into the center holes at both ends of the crankshaft, tie ropes to the lifting eye nuts 4 close to the end face of the crankshaft, move the assembly to the designated lifting point, and use screws 5 to install and fix the safety anti-collision callipers 2 to complete the preparation work for the lifting operation.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. A lifting device for marine crankshaft hoisting, characterized in that: include: Lifting shaft (1), safety anti-slip collar (2), baffle (3), lifting eye nut (4), screw (5); The hoisting shaft (1) is in the shape of a hollow cylinder as a whole, and its outer diameter is slightly smaller than the center hole of the crankshaft. Positions near both ends of the outer circle of the hoisting shaft (1) are respectively provided with guiding conical slopes to facilitate movement to a designated position in the center through hole of the crankshaft; Two positioning grooves slightly lower than the shaft surface are reserved in the middle of the outer circle of the hoisting shaft (1); the positioning grooves are used to install and fix the safety anti-collision calliper (2).

2. A lifting device for marine crankshaft hoisting according to claim 1, characterized in that: The safety anti-collision calliper (2) is composed of two semicircular rings, the upper semicircular ring of the two semicircular rings is provided with a step, and the step surface is provided with a through hole; The two semicircular rings are provided with threaded holes on their end faces symmetrical to the upper semicircle, for mounting screws (5). After assembly, their inner circles match the outer diameter of the grooves on the hanging shaft (1). The outer circle size must be larger than the diameter of the crankshaft center hole, so as to prevent the hanging shaft (1) from moving.

3. A lifting device for marine crankshaft hoisting according to claim 1, characterized in that: The baffle (3) is welded to the center of the end surfaces on both sides of the lifting shaft (1), and a thread hole is provided at the center of the baffle (3) for installing the lifting eye nut (4).

4. A lifting device for marine crankshaft hoisting according to claim 1, characterized in that: A rope is tied to the lifting ring of the lifting ring nut (4) and is used for disassembling or adjusting the lifting shaft (1).

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