CN220535768U

CN220535768U - Multi-layer integral covering piece for engineering machinery

Info

Publication number: CN220535768U
Application number: CN202322200682.8U
Authority: CN
Inventors: 王晓东; 龙景辉; 贺浩; 袁涛; 宋庆乐; 陈昱同; 王娅
Original assignee: China Railway Construction Heavy Industry Group Co Ltd
Current assignee: China Railway Construction Heavy Industry Group Co Ltd
Priority date: 2023-08-16
Filing date: 2023-08-16
Publication date: 2024-02-27
Anticipated expiration: 2033-08-16

Abstract

The multi-layer integral covering piece for engineering machinery is formed by welding an integral framework into a plurality of frames, and the frames are connected together in different appearance structures to form a multi-layer integral framework structure; the integral skin is welded on the outer surface of the integral skeleton; the access door and the radiating window are arranged on the outer surface and the inner side surface of the integral skin in a welding or assembling mode, and the opening flanging of the skin is provided with a flange; the crawling ladder is arranged on the outer surface of one of the frames welded on the integral framework in an assembling mode; the frame mounting plate is arranged on the inner side surface of the frame beam on the welding bottom surface of the integral frame in a welding manner; lifting lugs are arranged on the welded top surface of the integral framework in a welding mode. According to the utility model, a plurality of frames are connected together in different appearance structures to form a multi-layer integral skeleton structure, the integral skin is welded on the welding outer surface of the integral skeleton in a fitting manner to form a multi-layer integral covering piece, and different covering piece protection cavities can be connected together to form an integral welding structure.

Description

Multi-layer integral covering piece for engineering machinery

Technical Field

The utility model relates to the technical field of engineering machinery, in particular to a multilayer integral covering piece for engineering machinery.

Background

Along with the progress of scientific technology and the continuous development of social productivity in China, the engineering machinery industry is one of important supports for the economic development of entities in China, and has obvious promotion effect on national economy.

As is well known, the covering element is an essential element for protecting important parts such as an engineering mechanical engine, a hydraulic oil tank, an air cooler, a pump group and the like and providing heat dissipation and maintenance functions, and along with development of engineering mechanical industry, the covering element has not only a protection function, but also a main component part of an appearance part of the whole machine, and the appearance structure of the covering element influences the modeling of the whole equipment. In the prior art, the covering piece has two main types of split type and integral type in terms of structural form.

In the background art of the patent document, the reference number CN216866726U indicates that the split type covering piece has certain defects, namely, firstly, the split type covering piece is not attractive, the covering piece is divided into three parts, gaps at assembling joints are larger, the attractiveness is influenced, and the uniform characteristics of the gaps are difficult to control; secondly, the assembly difficulty of the three parts is very high, and the three parts are easy to deform during welding, so that the installation size is difficult to ensure. The patent document adopts an integral covering piece, so that the defects are avoided, but the appearance is straight and right-angled, streamline lines are not attractive, and meanwhile, the structural hierarchy is lack of change to influence the attractiveness.

Reference is made to CN205524476U, where the cover is a one-piece cover with a certain streamline shape, but the streamline side door and the shutter thereon are punched, which is relatively costly to manufacture and inconvenient for subsequent modification, optimization and upgrading.

In the prior art, in the aspects of ventilation and heat dissipation, assembly and installation modes, ladder stand setting and the like which are also considered when the covering piece is designed, the prior art lacks like products which simultaneously consider the factors of functional practicality, manufacturing cost, attractive appearance, light and simple and the like of the setting, and is not suitable for the requirement of the engineering machinery industry on the covering piece.

Therefore, according to the engineering machinery parts to be covered, it is necessary to design a cover piece which has rich layers, is integrally assembled, has lower cost and higher strength and rigidity.

Disclosure of Invention

First, the technical problem to be solved

In view of the above-mentioned shortcomings and disadvantages of the prior art, the present utility model provides a multi-layer integral covering element for engineering machinery, which solves the problems of low safety, high cost, unattractive shape, difficult installation, etc. of covering elements of engineering machinery that need to be protected in the actual production process.

(II) technical scheme

In order to achieve the above object, the present utility model provides a multilayer integral cover for construction machinery, comprising: the frame comprises an integral framework, an integral skin, an access door, a radiating window, a ladder stand, a frame mounting plate and lifting lugs; the whole skeleton welding is whole right angle trapezoidal body, and it is by the steel pipe welding, and right angle adjacent two sides all set up to the open phase, and other faces set up the reinforcing steel pipe, and it includes: the first frame is provided with a chamfer step with a layered left and right height near the middle surface and is in a state of low left and high right; the second frame is arranged at the right rear part of the first frame to form a long downward double-inclined-surface structure, the second frame is divided into an inclined surface I and an inclined surface II, the inclined angles of the inclined surface I and the inclined surface II are different, and the chamfer of the upper edge of the left side surface is identical to the chamfer shape of the chamfer step; the third frame is arranged at the left rear part of the first frame, the right side surface of the third frame is attached to the left side surface of the second frame and is provided with a short downward double inclined surface, and the third inclined surface and the fourth inclined surface are arranged; the inclination angle of the third inclined surface is different from that of the fourth inclined surface, the inclination angle of the third inclined surface is the same as that of the first inclined surface, and the inclination angle of the fourth inclined surface is different from that of the second inclined surface; the integral skin is manufactured by processing and welding thin steel plates, and comprises the following steps: the first skin, the second skin and the third skin are respectively adhered to and welded on the outer surfaces of the first frame, the second frame and the third frame; the access door and the radiating window are arranged at the opening of the integral skin in a welding or assembling mode; the crawling ladder is arranged on one of the frames welded by the integral framework in an assembled mode; the frame mounting plate is arranged on the inner side surface of the welded bottom of the integral framework in a welding manner; the lifting lugs are arranged on the welded top surface of the integral framework in a welding mode.

According to the utility model, the integral framework is welded, the integral skin, the access door, the radiating window, the ladder stand, the frame mounting plate and the lifting lug are integrally spliced and welded to form a plurality of frames according to the requirement of the engineering machinery, the frames are connected together in different appearance structures to form a multi-layer integral framework structure, the integral skin is welded on the outer surface of the integral framework in a bonding mode to form a multi-layer integral covering piece, different covering piece protection cavities can be connected together to form an integral welding structure, the integral assembly is convenient, and the structural layout of the framework and the covering piece is optimized, so that the covering piece is displayed in a multi-layer structural form, can be manufactured without opening a mould, meanwhile, the aspects of ventilation and heat dissipation of the covering piece, the assembly and mounting mode, the ladder stand setting and the like are mainly light, practical and attractive, the competitive power of products is increased, and various problems in the prior art are effectively solved.

Preferably, the access door has three structures, the first is a straight door plate double-door and the second is a special-shaped single-door, the two are arranged on the left side surface of the integral skin in a hinge welding mode, and the outline of the door frame is consistent with the outline line trend of the left side surface of the integral skin; and the third is an assembled straight door plate or cover plate which is arranged on the top outer surface or the right side surface of the integral skin.

Preferably, the radiating window has two structures, the first is that a punched screen plate and a door plate are welded; and the second is that the punched screen plate is directly welded with the inner side surface of the heat dissipation opening of the integral skin.

Preferably, the structure of the heat dissipation window welded with the punching screen plate and the door plate is as follows: the door plate is of a double-bending edge structure, a rectangular hole is formed in the middle of the door plate, a door plate separation strip is arranged in the middle of the rectangular hole, large round corners are arranged at four corners of the rectangular hole, and small round corners are arranged at four corners of two sides of the separation strip; the punching screen plate is welded at the rectangular hole on the inner side of the door plate; reinforcing ribs are arranged at intervals on the periphery of the punching screen plate on the inner side of the door plate, the reinforcing ribs are triangular, one end of the bottom of each reinforcing rib is provided with a notch and is used for being pressed on the punching screen plate; and the inner side of the door plate separating strip of the door plate is welded with a reinforcing plate of a U-shaped bending plate after the punching net is welded.

Preferably, the ladder stand is in an appearance structure with obliquely downward double inclined surfaces, is respectively parallel to the double inclined surfaces of the third frame and is higher than the third frame by a certain distance, and the ladder stand is connected with the third frame through bolts.

Preferably, a plurality of frame connecting plates are welded on the inner side of the welding bottom surface of the integral framework and are used for mounting and fixing the covering part body and the mounting blocks on the framework, the frame connecting plates are eight-shaped outer inclined bending plates, bending openings are downwards arranged on the inner side of the framework beam, and the frame mounting blocks are shielded after mounting and mechanical limiting is provided; two waist-shaped holes are formed in the frame connecting plate; the frame connecting plate is arranged close to the access door and the heat dissipation window.

Preferably, the welding top surface of the integral framework is provided with four lifting lugs, and the diagonal connecting lines of the lifting lugs are intersected above the gravity center of the covering part body.

Preferably, the access door and the heat dissipation window provide window channels for overhauling, operating or ventilating and dissipating heat of an engine, a hydraulic oil tank, an air cooler, a pump group and the like.

Preferably, the integral skeleton welding consists of square tubes, angle steel and bending plates; the double inclined surfaces are transited by arc surfaces.

(III) beneficial effects

According to the utility model, the protection components are required to be integrally spliced and welded to form a plurality of frames, the frames are connected together in different appearance structures to form a multi-layer integral skeleton structure, the integral skin is welded on the welding outer surface of the integral skeleton in a bonding mode to form a multi-layer integral covering piece, different covering piece protection cavities can be connected together to form an integral welding structure, the integral welding structure is convenient for integral assembly, and the covering piece can be manufactured in a multi-layer structural form without opening a die through optimizing the structural layout of the skeleton and the skin, meanwhile, the ventilation and heat dissipation of the covering piece, the assembly and installation mode, the ladder stand arrangement and the like are mainly light, practical and attractive, and the product competitiveness is improved. The method has the following specific beneficial effects:

1. the integral framework is welded into the integral framework, so that the generation of assembly gaps among different protection chamber structures of the covering part is avoided, the integral installation is convenient, the protection space is reasonably met according to a plurality of frames divided by the parts to be protected, the integral framework has various hierarchical structures, and single appearance hierarchy and straight-edge right angles are avoided.

2. The integral skin is supported by the integral skeleton welding, the appearance is attached to the integral skeleton welding, the integral skin can be formed by bending and welding a thin steel plate without opening a die, the manufacturing is simple, the cost is low, and the integral skin has the market competitive price advantage;

3. the whole skeleton welding is formed by welding square tubes, angle steel and reinforcing ribs (bending plates) to form a closed structure, and the welding is reasonable in lap joint distribution, compact and stable in structure, high in strength and rigidity, strong in deformation resistance and impact resistance, safe and reliable.

4. The door-net structure that the heat dissipation door adopted, only the net that punches a hole is formed by the mould punching press, and control pass, size and hole interval, cost of manufacture is also very low, wholly can not receive the mould restriction, and follow-up optimization change of being convenient for, weight is lighter, and the structure is brief but not losing intensity rigidity, and the radiating effect is good, all will not influence to induced draft and blowing, and the outward appearance is also better, has enriched the holistic outward appearance of covering.

5. The crawling ladder does not adopt a straight up-down structural form, keeps consistent with the hierarchical structure of the whole framework welding, and enriches the whole layering sense of the covering piece.

6. The frame mounting plate is built-in, does not influence the overall appearance, can operate the holistic installation of covering through opening the access door, still possesses the mechanical limit function under the limit condition simultaneously, guarantees the security of the holistic installation of covering.

Drawings

FIG. 1 is a schematic exploded view of a multi-level integral cover for a construction machine according to the present utility model;

FIG. 2 is a schematic view of a heat dissipating window of a multilayer integral cover for a construction machine according to the present utility model;

FIG. 3 is a view showing the structure of the other side of the multi-layered integral covering member and the structure of the frame mounting plate for the construction machinery.

The figure shows: integral skeleton welding 1, integral skin 2, access door 3, heat dissipation window 4, cat ladder 5, frame mounting plate 6, lug 7, frame one 11, frame two 12, frame three 13, chamfer step 111, inclined plane one 121, inclined plane two 122, edge chamfer 123, inclined plane three 131, inclined plane four 132, punched screen 41, door panel 42, stiffener 43, reinforcing plate 44.

Detailed Description

The utility model will be better explained by the following detailed description of the embodiments with reference to the drawings.

In order that the above-described aspects may be better understood, exemplary embodiments of the present utility model will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present utility model are shown in the drawings, it should be understood that the present utility model may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the utility model to those skilled in the art.

The utility model relates to a multilayer integral covering piece for engineering machinery, which comprises: the welding device comprises an integral framework 1, an integral skin 2, an access door 3, a radiating window 4, a ladder stand 5, a frame mounting plate 6 and lifting lugs 7; the whole skeleton welding 1 wholly is right trapezoid body, and it is by the steel pipe welding, and right angle adjacent two sides all set up to the open phase, and other faces set up the reinforcing steel pipe, and it includes: the frame I11 is provided with a chamfer step 111 with a layered left and right height near the middle surface and is in a state of low left and high right; the second frame 12 is disposed at the right rear of the first frame 11 to form a long downward double inclined surface structure, and is divided into a first inclined surface 121 and a second inclined surface 122, wherein the inclined angles of the first inclined surface and the second inclined surface are different, and the chamfer 123 of the upper edge of the left side surface has the same chamfer shape as the chamfer step 111; the third frame 13 is arranged at the left rear part of the first frame 11, the right side surface of the third frame is attached to the left side surface of the second frame 12, and is provided with a third inclined surface 131 and a fourth inclined surface 132 in a short downward double inclined surface; the third inclined surface 131 and the fourth inclined surface 132 have different inclination angles, the third inclined surface 131 and the first inclined surface 121 have the same inclination angle, and the fourth inclined surface 132 and the second inclined surface 122 have different inclination angles; the integral skin 2 is manufactured by processing and welding thin steel plates, and comprises the following steps: the first skin, the second skin and the third skin are respectively adhered to and welded on the outer surfaces of the first frame 11, the second frame 12 and the third frame 13; the access door 3 and the radiating window 4 are arranged at the opening of the integral skin 2 in a welding or assembling mode; the cat ladder 5 is arranged on one of the frames of the integral skeleton welding 1 in an assembled mode; the frame mounting plate 6 is arranged on the inner side surface of the bottom of the integral skeleton welding 1 in a welding mode; the lifting lug 7 is arranged on the top surface of the integral skeleton welding 1 in a welding mode.

The utility model will be described in detail with reference to fig. 1-3 of the accompanying drawings.

As shown in fig. 1, a multi-layered integral cover for a construction machine includes: integral skeleton welding 1, integral skin 2, access door 3, heat dissipation window 4, cat ladder 5, frame mounting panel 6, lug 7 etc.. The integral skeleton welding 1 can be divided into a plurality of frames according to the layout of the parts to be protected on the frame, and the frames are connected together in different appearance structures to form a multi-layer integral skeleton structure; the integral skin 2 is welded on the outer surface of the integral skeleton welding 1 in a mode of fitting the outline structure; the access door 3 and the radiating window 4 are arranged on the outer surface and the inner side surface of the integral skin 2 and the flanging of the opening of the skin in a welding or assembling mode; the crawling ladder 5 is arranged on the outer surface of one of the frames of the integral skeleton welding 1 in an assembled mode; the frame mounting plate 6 is arranged on the inner side surface of the frame beam at the bottom surface of the integral frame welding 1 in a welding mode; the lifting lugs 7 are arranged on the top surface of the integral skeleton welding 1 in a welding mode.

As shown in fig. 1, the integral skeleton welding 1 is formed by integrally splicing and welding square tubes, angle steel, bending plates and other structures, and in a specific embodiment, the integral skeleton welding is preferably divided into a first frame 11, a second frame 12 and a third frame 13. The first frame 11 is provided with a chamfer step 111 with a layered left and right height near the middle surface, so as to form a layered change with a low left and a high right; the second frame 12 is located at the right rear of the first frame 11, and forms a level change of the height of a long downward double inclined surface, the double inclined surface is transited by an arc surface (the arc surface is formed by arc angle steel formed by welding bent plates on a framework, and the lower part is the same) and is divided into a first inclined surface 121 and a second inclined surface 122, the inclined angles of the double inclined surfaces are different, but the upper edge chamfer 123 of the left side surface is consistent with the chamfer step 111 in size; the third frame 13 is located at the left rear of the first frame 11, the right side surface is tightly attached to the left side surface of the second frame 12, so that a height level change of a short downward double inclined surface is formed, the double inclined surface is also transited by an arc surface (the arc diameter is the same as the upper arc diameter) and can be divided into a third inclined surface 131 and a fourth inclined surface 132, the inclined angles of the double inclined surfaces are different, the inclined angles of the third inclined surface 131 and the first inclined surface 121 are consistent, and the inclined angle of the fourth inclined surface 132 and the second inclined surface 122 are different. Therefore, the framework structure forms different level changes in height, length and gradient, so that the internal protection space is reasonably met, and the layering sense is fully displayed.

As shown in fig. 1, the integral skin 2 is manufactured by conventional thin steel plate processing and welding, and is formed without a die, and can be divided into a skin one 21, a skin two 22 and a skin three 23, wherein the appearance of the skin one 21, the appearance of the skin two 22 and the appearance of the skin three 23 are respectively attached to the appearance of the frame one 11, the appearance of the frame two 12 and the appearance of the frame three 13, and are welded on the outer surfaces of the frame one, the frame two 12 and the frame three 13. The integral skin 2 has a direct protective effect, takes the framework as a support, ensures the strength and rigidity, is not easy to deform, and simultaneously presents the layering sense of the integral covering piece more intuitively.

As shown in fig. 1 and 3, the integral skin 2 is provided with a plurality of openings, and the openings are matched with the access door 3 and the heat dissipation window 4 to provide window channels for the overhaul, the operation or the ventilation and the heat dissipation of an engine, a hydraulic oil tank, an air cooler, a pump group and the like. The access door and the heat radiation window are almost indispensable parts of the engineering machinery covering piece, and the characteristics of reliability, light and simple structure, appearance and the like are fully considered for the parts, so that the competitiveness of the whole covering piece is improved.

As shown in fig. 1 and fig. 3, the access door 3 has three forms, the first two forms are a straight door plate double-door and the second one is a special-shaped single-door, the two forms are arranged on the left side surface of the integral skin 2 in a hinge welding mode, the outline of a door frame is consistent with the outline line trend of the left side surface of the integral skin 2, the outline layering sense of the side surface is supplemented, and the repair or filling work with high door opening frequency is facilitated in a hinge welding mode; and the third type is an assembled straight door plate or cover plate which is arranged on the top outer surface or the right side surface and is an infrequent overhauling maintenance surface and used for overhauling or filling work with lower door opening frequency. According to the actual overhaul operation condition, different forms of overhaul doors are adopted, so that the overhaul doors are diversified, different forms of door structures are different in weight, and heavier forms of doors can be prevented from being used for all various overhaul operation openings.

As shown in fig. 1 and 3, the heat dissipation window 4 has two structural forms, the first is that the punched screen 41 is welded to the door panel 42, and the second is that the punched screen 41 is welded to the inner side of the heat dissipation opening of the integral skin 2. The heat dissipation window 4 mainly provides a channel for heat dissipation and ventilation of an engine, an air cooler and the like, the layout positions are mainly the actual layout positions of related components, and in a specific embodiment, heat dissipation openings are preferably arranged on two side surfaces and the top surface, so that air convection can be formed, and ventilation and heat dissipation are effectively achieved.

Meanwhile, in the embodiment of the present utility model, the first door-net structure of the heat dissipation window 4 is preferably as follows: the door plate 42 is of a double-bending edge structure (formed by bending), a large rectangular hole (symmetrical in the middle) is formed in the middle of the door plate 42, a door plate dividing strip is arranged in the middle of the rectangular hole (the door plate dividing strip is usually arranged when the area of the punching screen 41 is large), large round corners are arranged at four corners of the rectangular hole, and small round corners are arranged at four corners of two sides of the dividing strip; the punching screen 41 is welded on the inner side of the door plate 42 at the rectangular holes, and the punching screen 41 is formed by punching a thin steel plate by a punching die machine; reinforcing ribs 43 are arranged at intervals on the periphery of the punching screen 41 on the inner side of the door plate 42; the reinforcing rib 43 is a long right-angle approximately triangular rib plate, and one end of the bottom is provided with a notch for pressing on the punching screen 41; the inner side of the door plate dividing strip of the door plate 42 is welded with a reinforcing plate 44 after the punching net 41 is welded; the reinforcing plate 44 is a U-shaped bent plate, which not only reinforces the structural strength of the whole door panel 42, but also prevents the perforated screen 41 from being deformed and uneven easily in a large area, so that the inner side of the door panel is not high enough in the degree of adhesion. The reinforcing ribs 43 and the reinforcing plate 44 are lightweight, and the rib structure cannot be directly seen from the view of the outer side surface of the door panel 42. Only the punching net is formed by punching by a punching die, the hole patterns, the sizes and the hole intervals are fixed, unified styles of the radiating windows of different products are guaranteed, no matter what type or size the radiating windows are, the punching net can be adapted to the inner sides of the door plate and the skin, and the defect that the punching net is limited by the die and inconvenient follow-up optimization and change is wholly avoided. Meanwhile, the door-net structure is light and simple, the strength and the rigidity are enough, the weight is greatly reduced compared with that of the grid door, and the door-net structure is attractive when seen from the outer side surface of the door.

As shown in fig. 1, the ladder stand 5 is also in an outer shape structure with a slant downward double inclined surface, and the welded mounting plate in the ladder stand 5 body is connected with the welded fixing plate on the frame three 13 through bolts, so that an up-down channel for an maintainer is formed, the double inclined surface of the ladder stand 5 and the double inclined surface of the frame three 13 are respectively parallel and are higher than each other by a certain distance, the ladder stand 5 body is light and simple, and the overall layering sense of the covering part is further enriched while the up-down function of the ladder stand is met.

As shown in fig. 3, a plurality of frame connecting plates 6 are welded and distributed on the inner side of the frame beam on the bottom surface of the integral frame welding 1 for mounting and fixing the covering part body and the frame. The frame connecting plate 6 is an outer oblique bending plate in an eight shape, the bending opening is downwards arranged on the inner side of the skeleton beam, when the frame connecting plate is in butt joint with the mounting blocks on the frame, the frame mounting blocks can be shielded, the mounting surface at the joint is not exposed, the appearance is not affected, and meanwhile, the oblique downward bending edge also provides mechanical limit when the bolts are loosened or broken under the limit condition, so that the mounting safety of the integral covering piece is fully ensured. Two waist-shaped holes are preferably formed in the frame connecting plate 6, and the arrangement of the waist-shaped holes can improve the dimension error of assembly butt joint. The concrete layout position of the frame connecting plate 6 is preferably close to the two side surfaces of the access door 3 and the heat dissipation window 4, and when the covering part is integrally installed, bolts can be easily screwed on the frame connecting plate 6 by opening each maintenance door. Therefore, the installation bolt can be conveniently screwed, the installation position is not exposed in the external sight, and the whole appearance of the covering piece is not influenced.

As shown in fig. 1, the number of lifting lugs 7 on the top surface of the integral skeleton welding 1 is preferably four, and the diagonal connecting lines of the lifting lugs 7 are intersected above the gravity center of the covering part body, so that the stability of the lifting state is improved, and the lifting risk is reduced.

The utility model provides an integral multi-layer covering piece for engineering machinery, wherein different protection cavities of the covering piece are connected together through an integral welded framework, and the covering piece does not need to be assembled separately; the skin is not required to be opened, can be formed only by bending, splicing and welding the thin steel plates, is simple to manufacture, has the appearance attached to the framework, and intuitively displays a multi-layer covering piece; the framework is formed by welding square tubes, angle steel and reinforcing ribs (bending plates), and is reasonable in lap joint distribution, compact and stable in structure, high in strength and rigidity, strong in deformation resistance and impact resistance, safe and reliable. Only punching net is needed to punch for manufacturing the access door, the radiating window and other structures, so that uniform style of the radiating structure is ensured, the structure is light, simple and various, and the strength and rigidity are reliable; the cat ladder is also arranged in a light and simple way and is matched with the overall layering sense; the frame mounting plate can be easily mounted without being exposed, and meanwhile, the safety limit in the limit state is provided.

It will be apparent to those skilled in the art that various modifications and variations can be made to the present utility model without departing from the spirit or scope of the utility model. Thus, the present utility model should also include such modifications and variations provided that they come within the scope of the following claims and their equivalents.

Claims

1. The utility model provides a multilayer integral covering for engineering machine tool which characterized in that: comprising the following steps: the frame comprises an integral framework, an integral skin, an access door, a radiating window, a ladder stand, a frame mounting plate and lifting lugs; the whole skeleton welding is whole right angle trapezoidal body, and it is by the steel pipe welding, and right angle adjacent two sides all set up to the open phase, and other faces set up the reinforcing steel pipe, and it includes: the first frame is provided with a chamfer step with a layered left and right height near the middle surface and is in a state of low left and high right; the second frame is arranged at the right rear part of the first frame to form a long downward double-inclined-surface structure, the second frame is divided into an inclined surface I and an inclined surface II, the inclined angles of the inclined surface I and the inclined surface II are different, and the chamfer of the upper edge of the left side surface is identical to the chamfer shape of the chamfer step; the third frame is arranged at the left rear part of the first frame, the right side surface of the third frame is attached to the left side surface of the second frame and is provided with a short downward double inclined surface, and the third inclined surface and the fourth inclined surface are arranged; the inclination angle of the third inclined surface is different from that of the fourth inclined surface, the inclination angle of the third inclined surface is the same as that of the first inclined surface, and the inclination angle of the fourth inclined surface is different from that of the second inclined surface; the integral skin is manufactured by processing and welding thin steel plates, and comprises the following steps: the first skin, the second skin and the third skin are respectively adhered to and welded on the outer surfaces of the first frame, the second frame and the third frame; the access door and the radiating window are arranged at the opening of the integral skin in a welding or assembling mode; the crawling ladder is arranged on one of the frames welded by the integral framework in an assembled mode; the frame mounting plate is arranged on the inner side surface of the welded bottom of the integral framework in a welding manner; the lifting lugs are arranged on the welded top surface of the integral framework in a welding mode.

2. A multi-level monolithic cover for a construction machine according to claim 1, wherein: the access door has three structures, namely a straight door plate double door and a special-shaped single door, wherein the two structures are arranged on the left side surface of the integral skin in a hinge welding mode, and the outline of a door frame is consistent with the outline line trend of the left side surface of the integral skin; and the third is an assembled straight door plate or cover plate which is arranged on the top outer surface or the right side surface of the integral skin.

3. A multi-level monolithic cover for a construction machine according to claim 1, wherein: the radiating window has two structures, and the first structure is formed by welding a punched screen plate with a door plate; and the second is that the punched screen plate is directly welded with the inner side surface of the heat dissipation opening of the integral skin.

4. A multi-level monolithic cover for a construction machine according to claim 3, wherein: the structure of the heat dissipation window welded with the punching screen plate and the door plate is as follows: the door plate is of a double-bending edge structure, a rectangular hole is formed in the middle of the door plate, a door plate separation strip is arranged in the middle of the rectangular hole, large round corners are arranged at four corners of the rectangular hole, and small round corners are arranged at four corners of two sides of the separation strip; the punching screen plate is welded at the rectangular hole on the inner side of the door plate; reinforcing ribs are arranged at intervals on the periphery of the punching screen plate on the inner side of the door plate, the reinforcing ribs are triangular, one end of the bottom of each reinforcing rib is provided with a notch and is used for being pressed on the punching screen plate; and the inner side of the door plate separating strip of the door plate is welded with a reinforcing plate of a U-shaped bending plate after the punching net is welded.

5. A multi-level monolithic cover for a construction machine according to claim 1, wherein: the cat ladder is in an appearance structure of a double inclined surface obliquely downwards, is parallel to the double inclined surface of the third frame and is higher than the double inclined surface of the third frame by a certain distance, and the cat ladder is connected with the third frame through bolts.

6. A multi-level monolithic cover for a construction machine according to claim 1, wherein: the inner side of the welding bottom surface of the integral framework is welded with a plurality of frame connecting plates which are used for mounting and fixing the covering part body and the mounting blocks on the framework, the frame connecting plates are eight-shaped outer oblique bending plates, bending openings are downwards arranged on the inner side of the framework beam, and the frame mounting blocks are shielded after mounting and mechanical limiting is provided; two waist-shaped holes are formed in the frame connecting plate; the frame connecting plate is arranged close to the access door and the heat dissipation window.

7. A multi-level monolithic cover for a construction machine according to claim 1, wherein: the welding top surface of the integral framework is provided with four lifting lugs, and the diagonal connecting lines of the lifting lugs are intersected above the gravity center of the covering part body.

8. A multi-level monolithic cover for a construction machine according to claim 1, wherein: the access door and the heat dissipation window provide window channels for the overhaul, operation or ventilation and heat dissipation of the engine, the hydraulic oil tank, the air cooler and the pump set.

9. A multi-level monolithic cover for a construction machine according to claim 1, wherein: the integral skeleton welding consists of square tubes, angle steel and bending plates; the double inclined surfaces are transited by arc surfaces.