Engine hood, engine hood assembly method and engineering machinery

Abstract

The invention provides an engine hood, an engine hood assembling method and engineering machinery, and the engine hood comprises a front hood assembly which comprises a front skeleton module and a front skin assembly installed outside the front skeleton module; the rear cover assembly and the front cover assembly are independently installed on a rear frame of the engineering machine in the front-back direction, and the rear cover assembly comprises a rear framework module and a rear skin assembly installed outside the rear framework module; the middle section assembly comprises a middle section framework assembly and a middle section skin assembly installed outside the middle section framework assembly, and the front end and the rear end of the middle section framework assembly are installed on the front framework module and the rear framework module respectively. According to the engine hood, modular installation of the engine hood is achieved while the production cost is reduced, and the assembly efficiency is high. And the associated size chain of related parts with strict clearance requirements is minimized, and the problems that in the prior art, a large loader engine hood is prone to being uneven in clearance, unreasonable in surface difference and poor in attractiveness are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of engineering machinery, and in particular relates to an engine hood, an engine hood assembly method and engineering machinery. Background Art

[0002] For construction machinery such as loaders, the main function of the engine hood is to protect the internal systems of the loader, such as the engine and radiator, from damage and improve the safety performance of the equipment. In addition, the engine hood also has the functions of dust prevention, noise reduction, and improving the aesthetics of the product.

[0003] At present, in the construction machinery industry, due to the small size of small and medium-sized loaders, the hood structure is generally a whole front-flip or rear-flip type with a simple structure. However, for large loaders, especially large hybrid loaders, the hood needs to cover the battery, engine, radiator, fan and other components, resulting in a large size and heavy weight of the entire hood, and a complex overall front-flip or rear-flip structure, resulting in high cost of the hood lifting device, which is not suitable for large loaders.

[0004] Therefore, most large loader engine hoods are designed in blocks, but the block-designed engine hoods have many installation situations of span systems or parts, the assembly datum is not uniform, and the dimension chain is long. This leads to high requirements for the manufacturing and assembly precision of the engine hood, and it is easy to have problems such as uneven gaps and unreasonable surface differences, which are not aesthetically pleasing. In addition, the block-designed engine hood assembly has poor integrity and is mostly loose parts. It needs to be assembled into the whole machine piece by piece, and most of the gap and surface difference adjustments need to be completed on the whole machine. The climbing operation takes a long time, is time-consuming and labor-intensive, and has low assembly efficiency. Summary of the invention

[0005] The main purpose of the present invention is to provide an engine hood, an engine hood assembly method and an engineering machinery, aiming to solve the technical problems in the prior art of low engine hood assembly efficiency, uneven gaps, unreasonable surface differences and other poor aesthetics.

[0006] In order to achieve the above object, the present invention provides an engine hood for engineering machinery, the engine hood comprising:

[0007] A front cover assembly, comprising a front frame module and a front skin component mounted outside the front frame module;

[0008] A rear cover assembly is used to be independently installed on the rear frame of the engineering machinery along the front-to-back direction together with the front cover assembly, wherein the rear cover assembly includes a rear frame module and a rear skin component installed outside the rear frame module;

[0009] The middle section assembly comprises a middle section skeleton component and a middle section skin component installed outside the middle section skeleton component, and the front and rear ends of the middle section skeleton component are respectively installed on the front skeleton module and the rear skeleton module.

[0010] In an embodiment of the present invention, the middle section skin assembly comprises:

[0011] A middle top cover is installed on the top of the middle frame assembly, and the front and rear ends of the middle top cover are respectively installed on the front frame module and the rear frame module;

[0012] Side door assembly, the middle frame assembly is provided with a maintenance opening, two side door assemblies are installed opposite to each other at the maintenance opening along the left and right directions, and the side door assembly is used to open or close the maintenance opening;

[0013] The middle skin is arranged opposite to each other along the left-right direction, and the side door assembly is located between the middle skin and the middle top cover along the up-down direction.

[0014] In an embodiment of the present invention, the middle section skeleton assembly includes two middle skeletons arranged relatively to each other in the left-right direction, the middle skeleton includes a vertical plate and two horizontal plates arranged at intervals in the up-down direction, the upper and lower ends of the vertical plate are respectively installed on the two horizontal plates, and the front and rear ends of the horizontal plate are respectively installed on the front skeleton module and the rear skeleton module.

[0015] In an embodiment of the present invention, the middle section skeleton assembly also includes a transition bracket for connecting the rear frame and the middle skin, the two horizontal plates are an upper horizontal plate and a lower horizontal plate, the middle top cover is installed on the upper horizontal plate, the side door lock of the side door assembly is installed on the vertical plate, and the upper and lower ends of the middle skin are respectively installed on the lower horizontal plate and the transition bracket.

[0016] In an embodiment of the present invention, the side door assembly includes a small side door and a large side door independently arranged along the front and rear directions, the length of the large side door is greater than that of the small side door, the large side door is installed on the rear frame module, and the small side door is installed on the front frame module.

[0017] In the embodiment of the present invention, the left and right sides of the middle top cover are provided with top cover folding edges for covering the assembly gap;

[0018] and / or,

[0019] The upper edge of the middle skin is provided with a skin fold for covering the assembly gap.

[0020] In an embodiment of the present invention, the front skin assembly includes a front top cover, two upper side panels and two lower side panels located below the upper side panels, the front top cover is installed on the top of the front skeleton module, the two upper side panels are installed on the side of the front skeleton module along the left-right direction, and the two lower side panels are installed on the side of the front skeleton module along the left-right direction;

[0021] and / or,

[0022] The rear skin assembly includes a rear top cover, a rear top window, a rear door, two rear side skin welded parts and two rear side windows. The rear top cover is installed on the top of the rear skeleton module, the rear door is installed on the rear side of the rear skeleton module, the two rear side skin welded parts are installed on the sides of the rear skeleton module along the left and right directions, the rear side skin welded parts are provided with windows, and the rear side windows are installed at the windows.

[0023] The present invention further provides an engine hood assembly method, which is applied to the engine hood as described above. The engine hood assembly method comprises:

[0024] Pre-assemble the front frame module and the front skin assembly into a front cover assembly, and pre-assemble the rear frame module and the rear skin assembly into a rear cover assembly;

[0025] Assembling the front cover assembly and the rear cover assembly to the rear frame respectively;

[0026] Pre-tighten the middle frame assembly through the connector;

[0027] Pre-install the front cover assembly and the rear cover assembly to obtain a roughly assembled cover;

[0028] Assembling the mid-section skin assembly to the rough-assembly cowling;

[0029] The connecting piece is tightened.

[0030] In an embodiment of the present invention, assembling the middle section skin assembly to the rough assembly hood includes:

[0031] The middle top cover is installed on the middle frame assembly, and the front and rear ends of the middle top cover are installed on the front frame module and the rear frame module respectively;

[0032] Install the side door assembly between the front frame module and the rear frame module, so that the two side door assemblies are installed outside the middle top cover in the left-right direction;

[0033] The middle skin is installed on the middle section skeleton assembly.

[0034] The present invention also provides an engineering machine, comprising the engine hood as described above.

[0035] Through the above technical solution, the engine hood provided by the embodiment of the present invention has the following beneficial effects:

[0036] The engine hood adopts a segmented assembly structure, which can avoid the complex structure of the overall forward or backward flip in the prior art, reducing the production cost. At the same time, the front skeleton module and the rear skeleton module are independent of each other, so that the front cover assembly and the rear cover assembly have their own independent skeletons, and provide their own skin installation points respectively, so that the front skin assembly and the rear skin assembly are independent of each other, avoiding the situation where the front skin assembly and the rear skin assembly are installed across the system, with a short dimensional chain and a small cumulative assembly error. The gaps and face differences in each skin assembly can be adjusted during offline pre-installation. The components of the middle section assembly are installed in the front cover assembly and the rear cover assembly. On the whole machine, it is only necessary to adjust the gaps and face differences between the related components of the middle section assembly and between the components of the middle section assembly and the front and rear cover assemblies. The engine hood is specifically divided into three sections from front to back, namely, the front hood assembly, the middle section assembly and the rear hood assembly, forming a segmented assembled engine hood; wherein the front hood assembly and the rear hood assembly are independently mounted on the rear frame, the middle section skeleton assembly is mounted on the front hood assembly and the rear hood assembly, and the middle section skin assembly is assembled on the middle section skeleton assembly. The present invention realizes modular installation of the engine hood, with high assembly efficiency; and minimizes the associated dimension chain of related parts with strict clearance requirements, thereby improving the problem of poor aesthetics of the engine hood in the prior art, such as uneven clearance and unreasonable surface difference.

[0037] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The accompanying drawings are used to provide an understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention, but do not constitute a limitation of the present invention. In the accompanying drawings:

[0039] Figure 1 is a schematic structural diagram of an engine hood according to an embodiment of the present invention;

[0040] Figure 2 is a schematic structural diagram of a front cover assembly of an engine cover according to an embodiment of the present invention;

[0041] Figure 3 is a schematic diagram of the overall exploded structure of the rear cover of the engine cover according to one embodiment of the present invention;

[0042] Figure 4 1 is a schematic diagram of the overall decomposed structure of the middle section of the engine hood according to an embodiment of the present invention.

[0043] Description of Reference Numerals

[0044] Label Name Label Name

[0045] 100 Engine hood 231 Middle top cover

[0046] 1 Front cover assembly 232 Top cover folding edge

[0047] 11 Front frame module 233 Large side door

[0048] 111 front bracket 234 small side door

[0049] 112 front thread seat 235 middle skin

[0050] 113 front support 3 rear cover assembly

[0051] 114 First top bracket 31 Rear frame module

[0052] 12 front skin assembly 311 rear bracket

[0053] 121 front cover 312 rear threaded seat

[0054] 122 upper side plate 313 rear support

[0055] 123 lower side plate 314 second top bracket

[0056] 2 Middle section assembly 32 Rear skin assembly

[0057] 21 Middle frame 321 Rear cover

[0058] 211 horizontal board 322 back door

[0059] 212 vertical plate 323 rear side skin welding

[0060] 22 Transition bracket 324 rear side window

[0061] 23 Middle section skin assembly 200 Rear frame DETAILED DESCRIPTION

[0062] The specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0063] The following describes an engine hood according to the present invention with reference to the accompanying drawings.

[0064] like Figures 1 to 4As shown, in an embodiment of the present invention, the engine hood 100 is used for engineering machinery, and the engine hood includes a front hood assembly 1, a rear hood assembly 3 and a middle section assembly 2; the front hood assembly 1 includes a front skeleton module 11 and a front skin assembly 12 installed outside the front skeleton module 11; the rear hood assembly 3 is used to be independently installed on the rear frame 200 of the engineering machinery along the front and rear directions with the front hood assembly 1, and the rear hood assembly 3 includes a rear skeleton module 31 and a rear skin assembly 32 installed outside the rear skeleton module 31; the middle section assembly 2 includes a middle section skeleton assembly and a middle section skin assembly 23 installed outside the middle section skeleton assembly, and the front and rear ends of the middle section skeleton assembly are respectively installed on the front skeleton module 11 and the rear skeleton module 31.

[0065] It can be understood that the engine hood 100 in this embodiment is mainly used for loaders. The engine hood 100 is mainly improved to improve the aesthetic problems of the existing large loader block bulk engine hood 100, such as poor integrity, low assembly efficiency, inconsistent component installation datum, uneven gaps caused by too long dimension chains, unreasonable surface difference, etc., and is suitable for the engine hood 100 of large hybrid loaders.

[0066] The engine hood 100 in this embodiment adopts a segmented assembly structure, which can avoid the complex structure of the overall forward or backward flip in the prior art, reducing the production cost. At the same time, the front skeleton module 11 and the rear skeleton module 31 are independent of each other, so that the front cover assembly 1 and the rear cover assembly 3 have their own independent skeletons, and provide their own skin installation points respectively, so that the front skin component 12 and the rear skin component 32 are independent of each other, avoiding the situation where the front skin component 12 and the rear skin component 32 are installed across the system, the dimension chain is short, and the cumulative assembly error is small. The gap and face difference in each skin component can be adjusted during offline pre-installation. The components of the middle section assembly 2 are installed on the front cover assembly 1 and the rear cover assembly 3. On the whole machine, it is only necessary to adjust the gap and face difference between the relevant components of the middle section assembly 2 and the components of the middle section assembly 2 and the front and rear cover assemblies 3. The engine hood 100 is specifically divided into three sections from front to back, namely, the front hood assembly 1, the middle section assembly 2 and the rear hood assembly 3, forming a segmented assembled engine hood 100; wherein, the front hood assembly 1 and the rear hood assembly 3 are independently mounted on the rear frame 200, the middle section skeleton assembly is mounted on the front hood assembly 1 and the rear hood assembly 3, and the middle section skin assembly 23 is assembled on the middle section skeleton assembly. The present invention realizes modular installation of the engine hood 100, with high assembly efficiency; and minimizes the associated dimension chain of related parts with strict clearance requirements, thereby improving the problem of poor aesthetics such as uneven clearance and unreasonable surface difference in the prior art engine hood 100.

[0067] like Figure 2 and Figure 3As shown, it should be noted that the front frame module 11 and the rear frame module 31 are both frame structures, and are in a cubic shape as a whole. The cross-sections of the front frame module 11 and the rear frame module 31 are both rectangular, with a simple and square structure, which is easy to assemble and produce. The front-to-back direction is the length direction of the engineering machinery, and the left-to-right direction is the width direction of the engineering machinery.

[0068] like Figure 1 and Figure 4 As shown, the middle section skin assembly 23 includes a middle top cover 231, a side door assembly and a middle skin 235. The middle top cover 231 is installed on the top of the middle section skeleton assembly, and the front and rear ends of the middle top cover 231 are respectively installed on the front skeleton module 11 and the rear skeleton module 31; the middle section skeleton assembly is provided with a maintenance opening, and the two side door assemblies are relatively installed at the maintenance opening along the left-right direction, and the side door assemblies are used to open or close the maintenance opening; the two middle skins 235 are relatively arranged along the left-right direction, and the side door assemblies are located between the middle skin 235 and the middle top cover 231 along the up-down direction.

[0069] The middle skin assembly 23 in this embodiment includes a middle top cover 231, a side door assembly and a middle skin 235 arranged in sequence from top to bottom. The block design of installing the side door assembly at the maintenance port can facilitate the maintenance and repair of the components in the engine hood 100. The front and rear ends of the middle top cover 231 are respectively installed on the front frame module 11 and the rear frame module 31, which can enhance the structural strength of the engine hood 100. In this embodiment, the front cover assembly 1, the rear cover assembly 3 and the middle frame assembly can all be connected to the side door assembly, further improving the structural strength of the engine hood 100.

[0070] In one embodiment, the middle frame assembly includes two middle frames 21 arranged opposite to each other in the left-right direction, the middle frame 21 includes a vertical plate 212 and two horizontal plates 211 arranged at intervals in the vertical direction, the upper and lower ends of the vertical plate 212 are respectively installed on the two horizontal plates, and the front and rear ends of the horizontal plate are correspondingly installed on the front frame module 11 and the rear frame module 31. The middle frame 21 in this embodiment is arranged in an I-shaped manner, including two horizontal plates 211 and one vertical plate 212, and has a simple structure and is easy to assemble.

[0071] like Figure 4As shown, the middle section skeleton assembly also includes a transition bracket 22 for connecting the rear frame 200 and the middle skin 235, the two transverse plates are respectively an upper transverse plate and a lower transverse plate, the middle top cover 231 is mounted on the upper transverse plate, the side door lock of the side door assembly is mounted on the vertical plate 212, and the upper and lower ends of the middle skin 235 are respectively mounted on the lower transverse plate and the transition bracket 22. The transition bracket 22 in this embodiment is L-shaped, and the middle skin 235 can be mounted on the rear frame 200 through the transition bracket 22. The middle top cover 231, the side door assembly and the middle skin 235 in this embodiment are all mounted on the same middle skeleton 21, which can avoid the uneven gap caused by the middle top cover 231, the side door assembly and the middle skin 235 being assembled on different skeletons.

[0072] Specifically, the side door assembly includes a small side door 234 and a large side door 233 independently arranged along the front-back direction, the length of the large side door 233 is greater than the length of the small side door 234, the large side door 233 is installed on the rear frame module 31, the small side door 234 is installed on the front frame module 11, and the lower edges of the large side door 233 and the small side door 234 are both against the middle skin 235. The small side door 234 in this embodiment is located in front of the large side door 233, and the two side door assemblies in this embodiment are relatively arranged along the left-right direction, and each side door assembly includes a large side door 233 and a small side door 234, so that the engine hood 100 forms a four-door structure, which is convenient for maintenance and can also avoid the situation of poor structural strength due to the excessive size of the side door by matching the large and small doors. The upper edge of the middle skin 235 in this embodiment matches the lower edge of the side door assembly, and the large side door 233 and the small side door 234 are matched with the same middle skin 235 at the same time, which can facilitate the control of the face difference and the gap and improve the face difference and the gap accuracy.

[0073] It should be noted that the left and right sides of the middle top cover 231 are provided with top cover folding edges 232 for covering the assembly gap; and the upper edge of the middle skin 235 is provided with a skin folding edge for covering the assembly gap. In this embodiment, the left and right sides of the middle top cover 231 are provided with top cover folding edges 232. After the middle top cover 231 is installed, the side door assembly is assembled, and the side door assembly can cover the top cover folding edge 232. The skin folding edge completely covers the upper edge of the middle skin 235. After the side door assembly is installed, the middle skin 235 is assembled, and the middle skin 235 can cover the skin folding edge, which can improve the aesthetics of the engine hood.

[0074] like Figure 2 and Figure 3As shown, the front skin assembly 12 includes a front top cover 121, two upper side panels 122 and two lower side panels 123 located below the upper side panels 122. The front top cover 121 is installed on the top of the front skeleton module 11, the two upper side panels 122 are installed on the side of the front skeleton module 11 along the left-right direction, and the two lower side panels 123 are installed on the side of the front skeleton module 11 along the left-right direction. It should be noted that the front top cover 121, the two upper side panels 122 and the two lower side panels 123 are all rectangular panels, and the upper and lower block design can be easily disassembled to meet the maintenance of the covered parts. In this embodiment, the front top cover 121, two upper side panels 122 and two lower side panels 123 are all installed on the front frame module 11. The front top cover 121 adopts a whole plate design, and the side adopts the structure of upper and lower block panels. A side reinforcing crossbeam is set on the side of the front frame module 11, providing an installation point for each of the upper side panels 122 and the lower side panels 123, which can ensure the structural strength of the front cover assembly 1, and can disassemble the side of the front cover assembly 1 in upper and lower blocks, which is convenient for subsequent maintenance. All parts of the front cover assembly 1 can be pre-installed offline, and after adjusting the gap surface difference between adjacent parts, the whole can be hoisted to the rear frame 200 of the engineering machinery, without the need to assemble them one by one to the engineering machinery, and the gap surface difference adjustment can be completed offline, reducing the time of climbing operations and improving assembly efficiency.

[0075] In addition, the rear skin assembly 32 includes a rear top cover 321, a rear top window, a rear door 322, two rear side skin welded parts 323 and two rear side windows 324. The rear top cover 321 can be welded to the top of the rear skeleton module 31, the rear door 322 is installed on the rear side of the rear skeleton module 31, and the two rear side skin welded parts 323 are installed on the side of the rear skeleton module 31 along the left and right directions. The rear side skin welded parts 323 are provided with windows, and the rear side windows 324 are installed at the windows and are used to open or close the windows. In this embodiment, the rear top cover 321, the rear door 322, the two rear side skin welded parts 323 and the two rear side windows 324 are all rectangular plates, and the rear door 322 and the rear side windows 324 are all porous plates, and are provided with a plurality of heat dissipation holes. All parts of the rear cover assembly 3 can be pre-installed offline, and after adjusting the gap surface difference between adjacent parts, they are hoisted as a whole to the rear frame 200 of the engineering machinery. There is no need to assemble them to the engineering machinery piece by piece, and the gap surface difference adjustment can be completed offline, which reduces the time of high-altitude operations and improves assembly efficiency.

[0076] The present invention further provides an engine hood assembly method, which is applied to the above engine hood 100. The engine hood assembly method comprises:

[0077] The front frame module 11 and the front skin assembly 12 are preassembled into the front cover assembly 1, and the rear frame module 31 and the rear skin assembly 32 are preassembled into the rear cover assembly 3;

[0078] Assemble the front cover assembly 1 and the rear cover assembly 3 to the rear frame 200;

[0079] Pre-tighten the middle frame assembly through the connector;

[0080] The front cover assembly 1 and the rear cover assembly 3 are hoisted for pre-installation to obtain a roughly assembled hood;

[0081] Assemble the middle section skin assembly 23 to the rough assembly cowling;

[0082] Tighten the connectors.

[0083] The engine hood 100 in this embodiment adopts the method of pre-installing the front hood assembly 1 and the rear hood assembly 3. All parts of the front hood assembly 1 and the rear hood assembly 3 can be pre-installed offline, and after adjusting the gap and face difference between adjacent parts, the whole is hoisted to the rear frame 200 of the engineering machinery, without the need to assemble them one by one to the engineering machinery, and the gap and face difference adjustment can be completed offline, reducing the time of climbing work and improving assembly efficiency. In addition, the middle section skeleton assembly and the middle section skin assembly 23 are pre-tightened first to obtain a roughly assembled engine hood, and finally the gap and face difference of the middle section components are adjusted, which can improve the gap and face difference adjustment accuracy.

[0084] In the embodiment of the present invention, pre-tightening the middle section skeleton assembly and the middle section skin assembly 23 includes:

[0085] The middle top cover 231 is installed on the middle frame assembly, and the front and rear ends of the middle top cover 231 are installed on the front frame module 11 and the rear frame module 31 respectively;

[0086] Install the side door assembly between the front frame module 11 and the rear frame module 31, so that the two side door assemblies are installed outside the middle top cover 231 in the left-right direction;

[0087] The middle skin 235 is installed on the middle section frame assembly.

[0088] In this embodiment, the front frame module 11 is provided with a front bracket 111, a front threaded seat 112 and a front support 113 on both sides of the rear end, and a plurality of first top brackets 114 arranged at intervals along the left and right directions are arranged at the top of the rear end of the front frame module 11. The front bracket 111 extends backward and has a mounting surface on the top. The front support 113 is arranged at the top of the front frame module 11 and extends backward. The top of the front support 113 is provided with a mounting surface, and the front threaded seat 112 is located between the front bracket 111 and the front support 113 in the up-down direction. The rear bracket 311, the rear threaded seat 312, the rear support 313 and the second top bracket 314 are provided on both sides of the front end of the rear frame module 31. The rear bracket 311 extends forward and has a mounting surface on the top. The rear support 313 and the second top bracket 314 are located at the top of the rear frame module 31.

[0089] Specifically, the two horizontal plates 211 and the vertical plate 212 of the middle frame assembly can be pre-assembled into the middle frame 21 as a small assembly, and the middle frame assembly can be hoisted as a whole to the front cover assembly 1 and the rear cover assembly 3. The front end of the upper horizontal plate is fixed to the front support 113, and the upper horizontal plate is fixed to the rear support 313; the front end of the lower horizontal plate is fixed to the front bracket 111, and the rear end of the lower horizontal plate is fixed to the rear bracket 311. The above installations all adopt rough assembly, and only pre-tightening is performed at this time.

[0090] The front and rear ends of the middle top cover 231 are fixed to the first top bracket 114 and the second top bracket 314 respectively, and the left and right ends of the middle top cover 231 are respectively installed to the two upper horizontal plates;

[0091] Pre-install the small side door 234 onto the front threaded seat 112 and the large side door 233 onto the rear threaded seat 312;

[0092] The transition bracket 22 is pre-installed on the rear frame 200 , and the upper end of the middle skin 235 is assembled to the lower cross plate, and the lower end is assembled to the transition bracket 22 .

[0093] Specifically, bolts can be used as connecting members to pre-assemble the middle section skeleton assembly, and the connecting bolts are only pre-tightened before the entire assembly is hoisted to the front cover assembly 1 and the rear cover assembly 3 for pre-installation (the bolts are only pre-tightened);

[0094] Install the middle top cover 231 to the middle frame assembly, the front frame module 11, and the rear frame module 31, so that the gap between the middle top cover 231 and the front top cover 121 and the rear top cover 321 is uniform and the surface difference is reasonable;

[0095] Install the side door assembly to the front frame module and the rear frame module so that the gap between the side door assembly and the front skin assembly 12, the rear skin assembly 32, and the middle top cover 231 is uniform and the surface difference is reasonable when the side door assembly is closed;

[0096] Install the middle skin 235 on the middle frame assembly and the transition bracket 22, and adjust the gap between the middle skin 235 and the adjacent components to be uniform and the surface difference to be reasonable;

[0097] Finally, tighten the mounting bolts of the middle frame assembly.

[0098] In the present embodiment, the various components of the middle section skeleton assembly are first pre-installed, which can facilitate the subsequent assembly of the middle section skin assembly 23, and the middle top cover 231 is assembled first, then the side door assemblies on the left and right sides of the middle top cover 231 are assembled, and finally the middle skin 235 under the side door assembly is assembled, forming an installation method from inside to outside and from top to bottom, which can facilitate the covering and installation of external components, avoid mutual interference between components, and facilitate subsequent gap and face difference adjustment.

[0099] The present invention further proposes an engineering machine, the engineering machine comprising the above engine hood 100, the specific structure of the engine hood 100 refers to the above embodiment. Since the engineering machine adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here. In one embodiment, the engineering machine can be applied to small and medium-sized loaders and large loaders. The engineering machine can also be applied to large hybrid loaders.

[0100] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0101] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0102] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0103] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. An engine hood for engineering machinery, characterized in that: The engine hood comprises: A front cover assembly (1) comprises a front frame module (11) and a front skin component (12) mounted outside the front frame module (11); A rear cover assembly (3) is used to be independently installed on a rear frame (200) of an engineering machine along a front-to-rear direction together with the front cover assembly (1), wherein the rear cover assembly (3) comprises a rear frame module (31) and a rear skin component (32) installed outside the rear frame module (31); The middle section assembly (2) comprises a middle section skeleton component and a middle section skin component (23) installed outside the middle section skeleton component, and the front and rear ends of the middle section skeleton component are respectively installed on the front skeleton module (11) and the rear skeleton module (31).

2. The engine hood according to claim 1, characterized in that: The middle section skin assembly (23) comprises: A middle top cover (231) is installed on the top of the middle frame assembly, and the front and rear ends of the middle top cover (231) are respectively installed on the front frame module (11) and the rear frame module (31); Side door assembly, the middle frame assembly is provided with a maintenance opening, two side door assemblies are installed opposite to each other at the maintenance opening along the left and right directions, and the side door assembly is used to open or close the maintenance opening; A middle skin (235), two middle skins (235) are arranged opposite to each other in the left-right direction, and the side door assembly is located between the middle skin (235) and the middle top cover (231) in the up-down direction.

3. The engine hood according to claim 2, characterized in that: The middle section skeleton assembly comprises two middle skeletons (21) arranged opposite to each other in the left-right direction, the middle skeleton (21) comprises a vertical plate (212) and two horizontal plates (211) arranged at intervals in the up-down direction, the upper and lower ends of the vertical plate (212) are respectively mounted on the two horizontal plates (211), and the front and rear ends of the horizontal plate (211) are respectively mounted on the front skeleton module (11) and the rear skeleton module (31).

4. The engine hood according to claim 3, characterized in that: The middle section skeleton assembly also includes a transition bracket (22) for connecting the rear frame (200) and the middle skin (235); the two transverse plates (211) are respectively an upper transverse plate and a lower transverse plate; the middle top cover (231) is mounted on the upper transverse plate; the side door lock of the side door assembly is mounted on the vertical plate (212); and the upper and lower ends of the middle skin (235) are respectively mounted on the lower transverse plate and the transition bracket (22).

5. The engine hood according to claim 2, characterized in that: The side door assembly comprises a small side door (234) and a large side door (233) which are independently arranged along the front-rear direction, the length of the large side door (233) is greater than the length of the small side door (234), the large side door (233) is installed on the rear skeleton module (31), the small side door (234) is installed on the front skeleton module (11), and the lower edges of the large side door (233) and the small side door (234) are both in contact with the middle skin (235).

6. The engine hood according to claim 2, characterized in that: The left and right sides of the middle top cover (231) are provided with top cover folding edges (232) for covering the assembly gap; and / or, The upper edge of the middle skin (235) is provided with a skin folded edge for covering the assembly gap.

7. The engine hood according to any one of claims 1 to 6, characterized in that: The front skin assembly (12) comprises a front top cover (121), two upper side panels (122) and two lower side panels (123) located below the upper side panels (122), the front top cover (121) being mounted on the top of the front skeleton module (11), the two upper side panels (122) being mounted on the side of the front skeleton module (11) along the left-right direction, and the two lower side panels (123) being mounted on the side of the front skeleton module (11) along the left-right direction; and / or, The rear skin assembly (32) comprises a rear top cover (321), a rear top window, a rear door (322), two rear side skin welded parts (323) and two rear side windows (324); the rear top cover (321) is installed on the top of the rear skeleton module (31); the rear door (322) is installed on the rear side of the rear skeleton module (31); the two rear side skin welded parts (323) are installed on the side of the rear skeleton module (31) along the left-right direction; the rear side skin welded parts (323) are provided with windows, and the rear side windows (324) are installed at the windows.

8. An engine hood assembly method, applied to the engine hood (100) according to any one of claims 1 to 7, characterized in that: The engine hood assembly method comprises: The front frame module (11) and the front skin assembly (12) are preassembled into a front cover assembly (1), and the rear frame module (31) and the rear skin assembly (32) are preassembled into a rear cover assembly (3); Assembling the front cover assembly (1) and the rear cover assembly (3) to a rear frame (200); Pre-tighten the middle frame assembly through the connector; The front cover assembly (1) and the rear cover assembly (3) are hoisted for pre-installation to obtain a roughly assembled cover; Assembling a mid-section skin assembly (23) on the rough assembly cowling; The connecting piece is tightened.

9. The engine hood assembly method according to claim 8, characterized in that: The step of assembling the middle skin assembly (23) on the rough assembly hood comprises: The middle top cover (231) is installed on the middle frame assembly, and the front and rear ends of the middle top cover (231) are installed on the front frame module (11) and the rear frame module (31) respectively; Installing the side door assembly between the front frame module (11) and the rear frame module (31), so that the two side door assemblies are installed outside the middle top cover (231) in the left-right direction; The middle skin (235) is installed on the middle section skeleton assembly.

10. An engineering machine, characterized in that: The engineering machine comprises the engine hood (100) according to any one of claims 1 to 7.

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