Flywheel assembly protective cover device for diesel generating set

Abstract

According to the flywheel assembly protective cover device for the diesel generating set, based on the split modular combined structure assembly design concept, a shell assembly is designed to be of an arch-shaped two-section split structure in which a left side split cover and a right side split cover are fastened, positioned and assembled into a whole at the connector position through a plurality of sets of connecting fasteners; the problems of low mounting efficiency, long manufacturing period and high manufacturing cost of the marine diesel generating set shaft system flywheel assembly housing are solved. A flywheel pointer window corresponding to a flywheel pointer in position and a turning mechanism avoiding window corresponding to a manual turning ratchet mechanism in position are arranged on the left side sub-housing, and a flywheel window plate and a turning window plate are adjustably mounted, so that potential safety risks generated when the shafting flywheel assembly works are thoroughly eliminated; the light-weight degree of thin plate corner joint tailor welding is high, the window plate adjustable function is achieved, field installation is convenient, efficiency is high, the manufacturing and machining production period is short, and popularization in the field of design and manufacturing of marine diesel engine generator sets is easy.

Description

Technical Field

[0001] The utility model belongs to the technical field of protection of a flywheel assembly of a shaft system of a marine diesel generator set, and particularly relates to a flywheel assembly protection cover device for a diesel generator set. Background Art

[0002] A marine diesel generator set usually consists of a diesel engine, a generator, a common base, and auxiliary electrical equipment. The diesel engine and generator are fixed together on the common base. At the same time, the crankshaft flange on the diesel engine side and the motor shaft flange on the generator side need to be equipped with a flywheel assembly (flywheel, coupling, inertia disc) to complete the connection of the entire generator set shaft system. On this basis, the entire marine diesel generator set shaft system can realize power transmission from the diesel engine side to the generator side. During the operation of the marine diesel generator set, the entire shaft system is in a state of high-speed rotation, and the flywheel assembly is partially exposed outside the diesel engine and generator, located in the middle of the two. In order to prevent foreign objects from falling into the working area of ​​the flywheel assembly and affecting the normal operation of the entire shaft system, and also to ensure the personal safety of on-site workers, it is necessary to design and install a protective cover for the marine diesel generator set shaft system flywheel assembly.

[0003] Currently, the flywheel assembly cover of the shaft system of marine diesel generator sets generally adopts an integral welding solution. The integral welding solution usually uses structural steel, and the overall plate is relatively thick (t = 20 to 50 mm), which is heavy and large in volume. During installation, on-site operators need to use the crane lifting function to adjust the assembly position of the integral flywheel assembly cover and the common base, and finally locate and tighten the mounting holes. The installation is time-consuming and inefficient. In addition, the integral flywheel assembly cover requires multiple heat treatment and cutting processes in the later stages of the manufacturing process, which prolongs the entire manufacturing cycle and increases the manufacturing cost. The integral welding scheme currently commonly used in the shaft flywheel assembly cover of marine diesel generator sets has the following problems in actual use: (1) The thickness of the structural steel plate (t = 20 ~ 50 mm) is large in weight and volume. During installation, the on-site operator needs to use the crane lifting function to adjust the assembly position of the integral flywheel assembly cover and the common base and position and tighten the final installation holes. The installation is time-consuming and inefficient. (2) Since thicker (t = 20 ~ 50 mm) sheet metal is used for bending and welding, there is a certain amount of welding residual stress and deformation after the integral welding. Therefore, after the welding process is completed, the integral flywheel assembly cover needs to undergo stress relief heat treatment and cutting process datum alignment, which makes the entire manufacturing cycle longer and the manufacturing cost higher; (3) Since the flywheel assembly cover does not bear load during operation, the design margin of the safety factor of the welding strength of thicker plates (t = 20 ~ 50mm) is too high, which does not meet the lightweight design requirements of the product; (4) The flywheel pointer installation window and the winch mechanism avoidance window on the flywheel assembly cover are not designed with a baffle, which poses a safety hazard; Therefore, it is necessary to make improvements to the above problems. Utility Model Content

[0004] The technical problem solved by the present invention is as follows: a flywheel assembly protective cover device for a diesel generator set is provided. Based on the split modular combination structure assembly design concept, the shell assembly is designed to be assembled into an arch-shaped two-petal split structure by fastening the left and right sub-cover shells at the interface position through multiple groups of connecting fasteners to solve the problems of low installation efficiency, long manufacturing cycle and high manufacturing cost of the shaft flywheel assembly cover of the marine diesel generator set. The flywheel pointer window corresponding to the flywheel pointer position and the winch mechanism avoidance window corresponding to the manual winch ratchet mechanism position are arranged on the left sub-cover shell, and the flywheel window panel and the winch window panel are adjustable in position, which completely eliminates the potential safety risks generated when the shaft flywheel assembly is working. The thin plate corner welding has a high degree of lightweight and has an adjustable window panel function. The on-site installation is convenient and efficient, the manufacturing and processing production cycle is short, the manufacturing cost is low, and it is safe and reliable. It is easy to promote in the field of design and manufacturing of marine diesel generator sets, has strong applicability for on-site manufacturing and installation, and the on-site installation method is simple and easy to operate.

[0005] The technical solution adopted by the utility model: a flywheel assembly protective cover device for a diesel generator set, comprising a shell assembly arranged between the diesel engine and the generator and fastened to the upper plate surface of a common base at the same time as the marine diesel engine, the manual cranking ratchet mechanism and the generator, the shell assembly being assembled into one piece by a left sub-cover shell and a right sub-cover shell at an interface position by multiple groups of connecting fasteners to form an arch-shaped two-flap split structure, a flywheel pointer window corresponding to the flywheel pointer position and a cranking mechanism avoidance window corresponding to the manual cranking ratchet mechanism position are formed on the outer wall of the left sub-cover shell, a flywheel window panel and a cranking window panel are adjustably installed on the left sub-cover shell, and the flywheel pointer window and the cranking mechanism avoidance window can be regulated in their open or closed states by adjusting the fixed positions of the flywheel window panel and the cranking window panel on the left sub-cover shell.

[0006] Among them, the left sub-cover shell includes a left large curved plate, a left upper end rib plate fixed on the outer wall of the upper edge of the interface of the left large curved plate, a left handle fixed in the middle of the horizontal plate of the left upper end rib plate, a left front end panel and a left rear end panel respectively fixed to the front and rear edges of the left large curved plate, a left small curved plate fixed on the outer wall of the inner edge of the left rear end panel, a left rib plate fixed on the middle of the outer wall of the left rear end panel and the upper edge of the left small curved plate, a left bottom rib plate 1 fixed on the outer wall of the lower edge of the left large curved plate, and a left bottom rib plate 2 fixed on the outer wall of the lower edge of the left front end panel. The flywheel pointer window and the winch mechanism avoidance window located below it are arranged on the plate surface at the front edge of the left large curved plate.

[0007] Furthermore, the flywheel window panel includes an arc plate 1 with horizontal open sliding grooves at the upper and lower ends of the panel surface, an upper vertical plate 1 fixed to the middle left side of the outer panel surface of the arc plate 1, and two limiting lower vertical plates 1 fixed to the left side of the inner panel surface of the arc plate 1. The arc plate 1, the upper vertical plate 1, and the limiting lower vertical plate 1 are all made of national standard cold-rolled steel plates and are laser cut as a whole; the left large curved plate surface is provided with two groups of through holes distributed above and below the flywheel pointer window, and a cross-slot pan head screw is spot-welded to the inner wall surface of the left large curved plate through the through holes on the inner wall of the left large curved plate, and a circular flat washer 3 is mounted on the cross-slot pan head screw and spot-welded to the outer wall surface of the left large curved plate, and the cross-slot pan head screw passes through the horizontal open sliding groove and is adaptively connected to the butterfly nut with a circular flat washer 3 spot-welded on the end, and the front and rear position of the flywheel window panel can be adjusted by loosening or tightening the butterfly nut.

[0008] The camshaft is connected to the upper and lower surfaces of the frame by means of a screw thread insert, and the camshaft is connected to the frame by means of a screw thread insert, and the camshaft is connected to the frame by means of a screw thread insert.

[0009] Furthermore, the right side sub-cover shell includes a right side large curved plate, a right side upper end rib plate fixed on the outer wall of the upper end interface edge of the right side large curved plate, a right side handle fixed on the middle part of the horizontal plate of the right side upper end rib plate, a right side front end panel and a right side rear end panel respectively fixed on the front and rear edges of the right side large curved plate, a right side small curved plate fixed on the outer wall of the inner edge of the right side rear end panel, a right side rib plate fixed on the middle part of the outer wall at the upper end edge of the right side small curved plate and the right side rear end panel, and a right side bottom rib plate fixed on the outer wall of the lower edge of the right side large curved plate.

[0010] Furthermore, the left upper rib plate, left rib plate, left bottom rib plate one, left bottom rib plate two, and the right upper rib plate, right rib plate, and right bottom rib plate are all made of angle steel in the national standard hot-rolled steel section; the left small curved plate, left rear end panel, left large curved plate, left front end panel, and right small curved plate, right rear end panel, right large curved plate, and right front end panel are all made of steel plates in the national standard cold-rolled steel section.

[0011] Furthermore, the connecting fasteners include a hexagonal external square bolt 1, a round flat washer 1 and a hexagonal external square nut. The left upper end rib and the left side rib on the left side sub-cover shell respectively correspond to the right upper end rib and the right side rib on the right side sub-cover shell and are fixed in position by multiple groups of hexagonal external square bolts 1, round flat washers 1 and hexagonal external square nuts. The left bottom rib 1 and the left bottom rib 2 at the lower end of the left side sub-cover shell and the right bottom rib at the lower end of the right side sub-cover shell are adapted and fixed with the threaded holes on the common base by multiple groups of hexagonal external square bolts 2 and round flat washers 2.

[0012] Furthermore, the left front end panel is provided with a flywheel pointer installation avoidance opening and a hand cranking mechanism avoidance opening for avoiding the flywheel pointer and the manual hand cranking ratchet mechanism respectively.

[0013] The method for installing a flywheel assembly protective cover device for a diesel generator set comprises the following steps:

[0014] 1) Before installing the housing assembly, first check and confirm that the flywheel pointer is correctly installed on the output end face of the marine diesel engine by fastening it with hexagonal outer square bolt 3, and that the manual turning ratchet mechanism is correctly positioned in the turning mechanism installation area of ​​the common base by fastening it with hexagonal outer square bolt 2. Then, make sure that the pawl of the manual turning ratchet mechanism is disengaged from the turning ring gear in the flywheel assembly. Finally, check and confirm that the installation of the flywheel assembly of the marine diesel generator set and the shaft alignment process have been completed;

[0015] 2) Visually inspect the common base for the housing assembly installation area to ensure there are no high spots, burrs, or paint on the mating surface. Also visually inspect the bottom surfaces of the left and right sub-covers of the housing assembly where they contact the common base for installation to ensure there are no high spots, burrs, or paint on the bottom surfaces.

[0016] 3) Manually loosen the butterfly nut on the left sub-cover, then adjust the flywheel window panel horizontally along its two horizontal opening slots until the flywheel pointer window is exposed, then tighten it. Then manually rotate the butterfly nut on the other side until the winch window panel moves vertically along its two vertical opening slots until the winch mechanism avoidance window is exposed, then tighten it.

[0017] 4) Hold the left handle of the left sub-housing and place it on the left side of the housing assembly mounting area of ​​the common base. Then, insert two sets of hexagonal external square bolts and two round flat washers through the through holes on the left bottom rib plate 1 and the left bottom rib plate 2 of the left sub-housing, and connect them to the threaded holes on the left side of the housing assembly mounting area of ​​the common base. Then, check the correctness of the matching dimensions of the outer contour of the left sub-housing, the flywheel pointer window, the winch mechanism avoidance window, the output end face of the marine diesel engine, the flywheel pointer, the manual winch ratchet mechanism, and the input shaft end face of the generator;

[0018] 5) Hold the right handle of the right sub-housing and place it on the right side of the housing assembly mounting area of ​​the common base. Then, insert two sets of hexagonal square bolts and two round flat washers through the multiple through-holes on the right bottom rib of the right sub-housing and fasten them to the threaded holes on the right side of the housing assembly mounting area of ​​the common base. Then, check the correctness of the dimensions of the outer contour of the right sub-housing and the output end face of the marine diesel engine and the input shaft end face of the generator;

[0019] 6) Install multiple sets of hexagonal square bolts, round flat washers, and hexagonal square nuts in sequence into the multiple through holes formed by the left upper rib plate and the left rib plate of the left sub-housing and the right upper rib plate and the right rib plate of the right sub-housing, respectively, and tighten the multiple sets of hexagonal square bolts, round flat washers, and hexagonal square nuts in sequence using a torque wrench;

[0020] 7) After the left and right sub-cover shells are fastened together, use a torque wrench to cross-tighten the two hexagonal external square bolts at the lower ends of the left and right sub-cover shells that are used to securely connect them to the common base.

[0021] 8) Use a 0.02mm feeler gauge to inspect the six groups of contact surfaces formed after the left and right sub-housings are assembled, namely, the three groups of contact surfaces formed by the left upper rib plate of the left sub-housing, the two left rib plates respectively contacting and laminating with the right upper rib plate and the two right rib plates of the right sub-housing, the two groups of contact surfaces formed by the left bottom rib plate 1 and the left bottom rib plate 2 of the left sub-housing and the common base mounting surface, and the one group of contact surfaces formed by the right bottom rib plate of the right sub-housing and the common base mounting surface. The assembly is qualified when the 0.02mm feeler gauge slides gently in a straight line along the gaps between the six groups of contact surfaces without the arc tip of the 0.02mm feeler gauge entering the gaps between the contact surfaces.

[0022] 9) After the housing assembly is installed, engage the pawl of the manual cranking ratchet mechanism with the cranking ring gear in the flywheel assembly, and start manual cranking to observe whether the flywheel assembly and the housing assembly in the entire marine diesel generator set shaft system interfere with each other. Observe whether the manual cranking ratchet mechanism interferes with the cranking mechanism avoidance window of the left sub-cover during operation. At the same time, observe the flywheel pointer and the cranking ring gear scale value in the flywheel assembly through the flywheel window panel of the left sub-cover. Manual cranking for two turns and one marine diesel engine working cycle is sufficient;

[0023] 10) After completing the interference inspection of the shell assembly during the working process of the marine diesel generator set, disengage the pawl of the manual cranking ratchet mechanism from the cranking ring gear in the flywheel assembly, and then move the flywheel window panel of the left sub-cover shell horizontally in the opposite direction along its own two horizontal opening slots to the limit position of the lower vertical plate 1, so that the flywheel window panel completely covers the flywheel pointer window, manually tighten the butterfly nut, and finally move the cranking window panel of the left sub-cover shell vertically in the opposite direction along its own two vertical opening slots to the limit position of the lower vertical plate 2, so that the cranking window panel completely covers the winching mechanism avoidance window. At this point, the installation and adjustment of the entire shell assembly is completed.

[0024] The advantages of this utility model compared with the prior art are:

[0025] 1. This technical solution is based on the concept of split modular combined structural assembly. The housing assembly is designed to be a left-side sub-shell and a right-side sub-shell fastened together at the interface by multiple sets of connecting fasteners to form an arch-shaped two-lobed split structure. This solves the problems of low installation efficiency, long manufacturing cycle and high manufacturing cost of the shaft system flywheel assembly cover of marine diesel generator sets.

[0026] 2. This technical solution completely eliminates potential safety risks arising from the operation of the shafting flywheel assembly by providing a flywheel pointer window corresponding to the flywheel pointer position and a cranking mechanism avoidance window corresponding to the position of the manual cranking ratchet mechanism on the left sub-housing. The flywheel window plate and the cranking window plate are adjustable in position.

[0027] 3. This technical solution has a high degree of lightweight due to the corner welding of thin plates, has the function of adjustable window panels, is convenient and efficient in on-site installation, has a short manufacturing and processing cycle, low manufacturing cost, and is safe and reliable;

[0028] 4. This technical solution can be applied to the efficient installation, low-cost, short-cycle production and manufacturing requirements of shaft flywheel assemblies of various types of marine diesel generator sets. It is easy to promote in the field of marine diesel generator set design and manufacturing, has strong applicability for on-site manufacturing and installation, and the on-site installation method is simple and easy to operate.

[0029] 5. This technical solution has a simple structure and light weight, does not require lifting operations, is easy to install on site, and has high operating efficiency. On-site installation verification shows that the assembly of the split flywheel assembly cover can be completed in 15 to 20 minutes. It has good versatility and strong applicability for on-site manufacturing and installation, can meet the requirements of batch and serialized manufacturing, and has good practical application effects and promotion value in the field of design and manufacturing of marine diesel engine generator sets; BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the installation structure of the utility model;

[0031] Figure 2 for Figure 1 A partial enlarged schematic diagram in the middle;

[0032] Figure 3 for Figure 1 A partial enlarged diagram of the middle B

[0033] Figure 4 This is a schematic diagram of the housing assembly structure of the utility model;

[0034] Figure 5 This is a schematic diagram of the left side sub-cover structure of the utility model;

[0035] Figure 6 This is a schematic diagram of the right side sub-cover structure of the utility model;

[0036] Figure 7 This is a schematic diagram of the planar structure of the left large curved plate of the utility model;

[0037] Figure 8 This is a schematic diagram of the planar structure of the left front end panel of the utility model;

[0038] Figure 9 This is the front view of the flywheel window panel structure of the utility model;

[0039] Figure 10 This is a left view of the flywheel window panel structure of the utility model;

[0040] Figure 11 This is the front view of the window panel structure of the utility model;

[0041] Figure 12 This is a left side view of the window panel structure of the utility model;

[0042] Figure 13 This is a schematic diagram of the installation structure of the flywheel window panel and the wheel window panel on the left large curved plate of the utility model;

[0043] Figure 14 for Figure 13 Middle CC section view;

[0044] Figure 15 for Figure 13 Middle DD cross-sectional view. DETAILED DESCRIPTION

[0045] The following is a combination of the embodiments of the present invention Figure 1-15 The technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0046] It should be noted that, in this document, unless otherwise stated, it should be understood that the terms "center," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely for the purpose of facilitating the description of the present invention and simplifying the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0047] As used herein, the terms "comprises," "comprising," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, the phrase "comprising a..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus that includes the elements.

[0048] Flywheel assembly protective cover device for diesel generator sets, such as Figure 1-15 As shown, it includes a housing assembly 1 arranged between the diesel engine 2 and the generator 5 and fastened to the upper surface of the common base 3 together with the marine diesel engine 2, the manual cranking ratchet mechanism 4 and the generator 5, as shown in FIG. Figure 4 As shown, the housing assembly 1 is assembled into one by a left sub-cover shell 1-1 and a right sub-cover shell 1-2 at the interface position by multiple sets of connecting fasteners to form an arch-shaped two-petal split structure, and a flywheel pointer window 1-1-7-1 corresponding to the position of the flywheel pointer 6 and a cranking mechanism avoidance window 1-1-7-2 corresponding to the position of the manual cranking ratchet mechanism 4 are formed on the outer wall of the left sub-cover shell 1-1, and a flywheel window panel 1-1-6 and a cranking window panel 1-1-8 are adjustably installed on the left sub-cover shell 1-1, and the flywheel pointer window 1-1-7-1 and the cranking mechanism avoidance window 1-1-7-2 are opened or closed by adjusting the fixed position of the flywheel window panel 1-1-6 and the cranking window panel 1-1-8 on the left sub-cover shell 1-1; in the above structure, based on the split modular combination structure assembly design principle The shell assembly 1 is designed to be assembled into an integral body by fastening the left sub-shell 1-1 and the right sub-shell 1-2 at the interface position through multiple sets of connecting fasteners to form an arch-shaped two-petal split structure, which solves the problems of low installation efficiency, long manufacturing cycle and high manufacturing cost of the shaft flywheel assembly cover of the marine diesel generator set; by arranging a flywheel pointer window 1-1-7-1 corresponding to the position of the flywheel pointer 6 and a winch mechanism avoidance window 1-1-7-2 corresponding to the position of the manual winch ratchet mechanism 4 on the left sub-shell 1-1, the flywheel window panel 1-1-6 and the winch window panel 1-1-8 are adjustable in position, which completely eliminates the potential safety risks generated when the shaft flywheel assembly is working; the thin plate angle welding has a high degree of lightweight, has an adjustable window panel function, is convenient and efficient in on-site installation, has a short manufacturing and processing production cycle, low manufacturing cost, and is safe and reliable;

[0049] like Figure 5As shown, the specific structure of the left sub-cover shell 1-1 is as follows: the left sub-cover shell 1-1 includes a left large curved plate 1-1-7, a left upper end rib plate 1-1-1 fixed to the outer wall of the upper end interface edge of the left large curved plate 1-1-7, a left handle 1-1-2 fixed to the middle of the horizontal plate of the left upper end rib plate 1-1-1, a left front end panel 1-1-11 and a left rear end panel 1-1-5 respectively fixed to the front and rear edges of the left large curved plate 1-1-7, and a left small curved plate 1-1-4 fixed to the outer wall of the inner edge of the left rear end panel 1-1-5. , the left rib plate 1-1-3 fixed to the middle of the outer wall at the upper edge of the left rear end panel 1-1-5 and the left small curved plate 1-1-4, the left bottom rib plate 1 1-1-9 fixed to the outer wall at the lower edge of the left large curved plate 1-1-7, and the left bottom rib plate 2 1-1-10 fixed to the outer wall at the lower edge of the left front end panel 1-1-11. The flywheel pointer window 1-1-7-1 and the winch mechanism avoidance window 1-1-7-2 located below it are provided on the plate surface at the front edge of the left large curved plate 1-1-7. The above parts are welded and spliced ​​into a whole;

[0050] Among them, the left large curved plate 1-1-7, the left front end panel 1-1-11, the left rear end panel 1-1-5 and the left small curved plate 1-1-4 are all formed by cutting, blanking and sheet metal bending forming process to form arc surface + vertical surface;

[0051] like Figure 9-10 As shown, the specific structure of the flywheel window panel 1-1-6 is as follows: the flywheel window panel 1-1-6 includes an arc plate 1-1-6-1 with horizontal open slide grooves 1-1-6-4 at the upper and lower ends of the panel surface, an upper vertical plate 1-1-6-2 fixed to the middle of the left side of the outer panel surface of the arc plate 1-1-6-1, and two limit lower vertical plates 1-1-6-3 fixed to the left side of the inner panel surface of the arc plate 1-1-6-1. The arc plate 1-1-6-1, the upper vertical plate 1-1-6-2, and the limit lower vertical plate 1-1-6-3 are all made of national standard cold-rolled steel plates by laser cutting as a whole; the left large curved plate 1-1-7 is provided with flywheel pointer windows distributed on the panel surface. There are two groups of through holes above and below 1-1-7-1, and the cross-slot pan head screw 1-1-12 is fixed to the inner wall of the left large curved plate 1-1-7 by spot welding through the through holes on the inner wall of the left large curved plate 1-1-7. The cross-slot pan head screw 1-1-12 is equipped with a circular flat washer three 1-1-13 which is spot welded to the outer wall of the left large curved plate 1-1-7, and the cross-slot pan head screw 1-1-12 passes through the horizontal open slide groove 1-1-6-4 and is adapted to be connected with the butterfly nut 1-1-14 with the circular flat washer three 1-1-13 spot welded on the end, and the front and rear position of the flywheel window panel 1-1-6 can be adjusted by loosening or tightening the butterfly nut 1-1-14.

[0052] The flywheel window panel 1-1-6 and the turning window panel 1-1-8 are fastened to the flywheel pointer window 1-1-7-1 and the turning mechanism avoidance window 1-1-7-2 of the left large curved plate 1-1-7 by four groups and two groups of cross recessed pan head screws 1-1-12, three round flat washers 1-1-13 and butterfly nuts 1-1-14 respectively, so as to meet the protection and shielding of the flywheel pointer window 1-1-7-1 and the turning mechanism avoidance window 1-1-7-2 on the left sub-cover 1-1. At the same time, the flywheel window panel 1-1-6 and the turning window panel 1-1-8 have the function of adjustable position movement, which takes into account the opening and closing needs of the flywheel pointer installation window and the turning mechanism avoidance window during the installation, maintenance and operation of the marine diesel generator set, and improves the environmental adaptability of the flywheel assembly cover under various operating conditions. When the marine diesel generator set needs to be manually cranked during daily maintenance, the on-site personnel can manually rotate the butterfly nut 1-1-14 to the appropriate position, and the flywheel window panel 1-1-6 can be horizontally moved and adjusted to the appropriate position along its two horizontal opening slots 1-1-6-4, exposing the flywheel pointer window 1-1-7-1, so that the on-site personnel can visually observe the position of the flywheel pointer and ensure manual cranking to the crankshaft angle of the appropriate cylinder; when the marine diesel generator set is working normally and the entire shaft system is in a high-speed rotation state, the flywheel window panel 1-1-6 can be manually adjusted and horizontally moved along its two horizontal opening slots 1-1-6-4 to a position that completely covers the flywheel pointer window 1-1-7-1, which can meet the protection and shielding requirements of the marine diesel generator set shaft system in the high-speed rotation state.

[0053] like Figure 11-12 As shown, the specific structure of the window panel 1-1-8 is as follows: the window panel 1-1-8 includes an arc plate 1-1-8-1 with vertical open chutes 1-1-8-4 on both sides of the panel, an upper vertical plate 1-1-8-2 fixed to the middle of the upper panel of the arc plate 1-1-8-1 and located between the two vertical open chutes 1-1-8-4, and two limiting lower vertical plates 1-1-8-3 located between the two vertical open chutes 1-1-8-4 and fixed to the lower panel of the arc plate 1-1-8-1. The arc plate 1-1-8-1, the upper vertical plate 1-1-8-2 and the limiting lower vertical plate 1-1-8-3 are all made of national standard cold-rolled steel plates with a thickness of 2 mm and are laser cut as a whole; as shown Figure 7As shown, the left large curved plate 1-1-7 is provided with two through holes distributed above the avoidance window 1-1-7-2 of the winch mechanism, and a cross-slot pan head screw 1-1-12 is fixed to the inner wall of the left large curved plate 1-1-7 by spot welding through the through holes on the inner wall of the left large curved plate 1-1-7, and the cross-slot pan head screw 1-1-12 is provided with a circular flat washer three 1-1-13 spot-welded to the outer wall of the left large curved plate 1-1-7, and the cross-slot pan head screw 1-1-12 passes through the vertical opening slide groove 1-1-8-4 and is adapted to be connected with the butterfly nut 1-1-14 with the circular flat washer three 1-1-13 spot-welded at the end, and the up and down position of the winch window panel 1-1-8 can be adjusted by loosening or tightening the butterfly nut 1-1-14.

[0054] When the marine diesel generator set needs to be manually cranked during routine maintenance, on-site personnel can manually rotate the butterfly nut 1-1-14 to the appropriate position, and the cranking window plate 1-1-8 can be adjusted to the appropriate position along its two vertical opening slots 1-1-8-4, exposing the cranking mechanism avoidance window 1-1-7-2, ensuring that the pawl and the cranking ring gear are normally engaged when the manual cranking ratchet mechanism is working, and providing a certain space for the operation of the mechanism; when the marine diesel generator set is working normally and the entire shaft system is in a high-speed rotation state, the manual cranking ratchet mechanism pawl is disengaged from the cranking ring gear, and the cranking window plate 1-1-8 can be manually adjusted along its two vertical opening slots 1-1-8-4 to a position covering the cranking mechanism avoidance window 1-1-7-2, which can also meet the protection and shielding requirements of the marine diesel generator set shaft system under high-speed rotation.

[0055] like Figure 6 As shown, the specific structure of the right side sub-cover shell 1-2 is as follows: the right side sub-cover shell 1-2 includes a right side large curved plate 1-2-7, a right side upper end rib plate 1-2-1 fixed on the outer wall of the upper end interface edge of the right side large curved plate 1-2-7, a right side handle 1-2-2 fixed to the middle of the horizontal plate of the right side upper end rib plate 1-2-1, a right side front end panel and a right side rear end panel 1-2-5 respectively fixed to the front and rear edges of the right side large curved plate 1-2-7, a right side small curved plate 1-2-4 fixed on the outer wall of the inner edge of the right side rear end panel 1-2-5, a right side rib plate 1-2-3 fixed to the middle of the outer wall at the upper end edge of the right side small curved plate 1-2-4 and the right side rear end panel 1-2-5, and a right side bottom rib plate 1-2-6 fixed on the outer wall of the lower edge of the right side large curved plate 1-2-7.

[0056] The left upper rib 1-1-1, left rib 1-1-3, left bottom rib 1-1-9, left bottom rib 2 1-1-10, and right upper rib 1-2-1, right rib 1-2-3, and right bottom rib 1-2-6 are all made of 5mm thick angle steel, standard hot-rolled steel. The left small curved plate 1-1-4, left rear end panel 1-1-5, left large curved plate 1-1-7, left front end panel 1-1-11, and right small curved plate 1-2-4, right rear end panel 1-2-5, right large curved plate 1-2-7, and right front end panel are all made of standard cold-rolled steel. These components are then joined by splicing and welding. The left and right handles 1-1-2 and 1-2-2 are both made of 10mm diameter standard structural steel Q235A\GB / T700.

[0057] like Figure 4 As shown, the specific connection structure of the connecting fasteners is as follows: the connecting fasteners include a hexagonal outer square bolt 1-3, a round flat washer 1-4 and a hexagonal outer square nut 1-5, and the left upper end rib plate 1-1-1 and the left side rib plate 1-1-3 on the left side sub-cover shell 1-1 correspond to the right upper end rib plate 1-2-1 and the right side rib plate 1-2-3 on the right side sub-cover shell 1-2 respectively, and are fixed in position and connected through multiple groups of hexagonal outer square bolts 1-3, round flat washers 1-4 and hexagonal outer square nuts 1-5, so that the left side sub-cover shell 1-1 and the right side sub-cover shell 1-2 are fixed in position and assembled, and finally assembled into The cover assembly 1 of the marine diesel generator set with adjustable window panels has low positioning accuracy requirements, convenient on-site installation and high efficiency. The multiple groups of fastening bolt holes between the left sub-cover shell 1-1 and the right sub-cover shell 1-2 are evenly distributed in the horizontal and vertical directions, so that the load on the fastening contact surface is balanced and the connection is reliable; the left bottom rib 1-1-9 and the left bottom rib 2 1-1-10 at the lower end of the left sub-cover shell 1-1 and the right bottom rib 1-2-6 at the lower end of the right sub-cover shell 1-2 are adapted and fixed with the threaded holes on the common base 3 by multiple groups of hexagonal external square bolts 2 1-6 and round flat washers 2 1-7.

[0058] The left sub-cover shell 1-1 and the right sub-cover shell 1-2 are both made of thin-walled plates with corner welding without any machining process. The flywheel assembly cover has low mass, low raw material consumption, short manufacturing cycle and low cost. The flywheel pointer window 1-1-7-1 and the winch mechanism avoidance window 1-1-7-2 on the left sub-cover shell 1-1 are respectively equipped with a flywheel window plate 1-1-6 and a winch window plate 1-1-8 with manually adjustable positions, which can meet the opening and closing of the above windows in different working conditions, greatly improving the flywheel The applicability and safety of the assembly cover in complex working conditions; after the left large curved plate 1-1-7 and the left front end panel 1-1-11 are spliced ​​and spot-welded, the flywheel pointer window 1-1-7-1 and the flywheel pointer installation avoidance opening 1-1-11-1, the turning mechanism avoidance window 1-1-7-2 and the turning mechanism avoidance opening 1-1-11-2 are respectively combined to form the flywheel pointer installation window and the turning mechanism avoidance window, so as to facilitate the later installation of the flywheel pointer and turning mechanism of the marine diesel engine.

[0059] like Figure 8 As shown, the structure of the left front panel 1-1-11 is as follows: the left front panel 1-1-11 is provided with a flywheel pointer installation avoidance opening 1-1-11-1 and a hand-cranking ratchet mechanism avoidance opening 1-1-11-2 for avoiding the flywheel pointer 6 and the manual hand-cranking ratchet mechanism 4 respectively.

[0060] Finite element analysis software is used to simulate the actual working environment of the marine diesel generator set housing assembly 1 with the adjustable flywheel window panel 1-1-6 and the turntable window panel 1-1-8 to impose constraints and boundary conditions, such as Figure 3 As shown in the figure, the dynamic modal and harmonic response simulation calculation analysis of the marine diesel generator set cover assembly 1 with adjustable flywheel window panel 1-1-6 and turning car window panel 1-1-8 is carried out. The results show that the marine diesel generator set cover assembly 1 with adjustable flywheel window panel 1-1-6 and turning car window panel 1-1-8 has good structural dynamic characteristics, reliable and safe structural dynamic strength and stiffness while meeting the lightweight design requirements. At the same time, the first 6 modal natural vibration modes of the marine diesel generator set cover assembly 1 with adjustable flywheel window panel 1-1-6 and turning car window panel 1-1-8 are far away from the excitation frequency generated under different working conditions of the marine diesel generator set, which can avoid the occurrence of resonance phenomenon.

[0061] The method for installing a flywheel assembly protective cover device for a diesel generator set comprises the following steps:

[0062] 1) Before installing the housing assembly 1, first check and confirm that the flywheel pointer 6 is correctly positioned on the output end face of the marine diesel engine 2 by fastening it with the hexagonal outer square bolt 3 6-1, and that the manual turning ratchet mechanism 4 is correctly positioned on the turning mechanism installation area of ​​the common base 3 by fastening it with the hexagonal outer square bolt 2 4-1. Then, make sure that the pawl of the manual turning ratchet mechanism 4 is disengaged from the turning ring gear in the flywheel assembly. Finally, check and confirm that the installation of the marine diesel generator set flywheel assembly and the shaft alignment process are complete.

[0063] 2) Visually inspect the mounting surface of the housing assembly 1 on the common base 3 to ensure it has no high spots, burrs, or paint. Also visually inspect the bottom surfaces of the left sub-shell 1-1 and the right sub-shell 1-2 of the housing assembly 1 where they contact the common base 3 to ensure they have no high spots, burrs, or paint.

[0064] 3) Manually loosen the butterfly nut 1-1-14 on the left side of the sub-cover 1-1, then horizontally move the flywheel window panel 1-1-6 along its two horizontal opening slots 1-1-6-4 until the flywheel pointer window 1-1-7-1 is exposed, then tighten it. Then manually rotate the butterfly nut 1-1-14 on the other side until the winch window panel 1-1-8 moves vertically along its two vertical opening slots 1-1-8-4 until the winch mechanism avoidance window 1-1-7-2 is exposed, then tighten it.

[0065] 4) Hold the left handle 1-1-2 of the left sub-housing 1-1 and place it on the left side of the housing assembly 1 installation area of ​​the common base 3. Then, insert multiple sets of hexagonal external square bolts 1-6 and round flat washers 1-7 through the through holes on the left bottom rib plate 1-1-9 and the left bottom rib plate 1-1-10 of the left sub-housing 1-1, and connect them to the threaded holes on the left side of the housing assembly 1 installation area of ​​the common base 3. Then, check the correctness of the matching dimensions of the outer contour of the left sub-housing 1-1, the flywheel pointer window 1-1-7-1, the winch mechanism avoidance window 1-1-7-2, the output end face of the marine diesel engine 2, the flywheel pointer 6, the manual winch ratchet mechanism 4, and the input shaft end face of the generator 5.

[0066] 5) Hold the right handle 1-2-2 of the right sub-housing 1-2 and place it on the right side of the housing assembly 1 installation area of ​​the common base 3. Then, insert multiple sets of hexagonal square bolts 1-6 and round flat washers 1-7 through the multiple through holes on the right bottom rib 1-2-6 of the right sub-housing 1-2 and fasten them to the threaded holes on the right side of the housing assembly 1 installation area of ​​the common base 3. Then, check the correctness of the outer contour of the right sub-housing 1-2 and the correct size of the position of the output end face of the marine diesel engine 2 and the input shaft end face of the generator 5.

[0067] 6) Install multiple sets of hexagonal square bolts 1-3, round flat washers 1-4, and hexagonal square nuts 1-5 in sequence into the multiple through holes formed by the left upper end rib plate 1-1-1 and the left rib plate 1-1-3 of the left sub-housing 1-1 and the right upper end rib plate 1-2-1 and the right rib plate 1-2-3 of the right sub-housing 1-2, respectively, and tighten the multiple sets of hexagonal square bolts 1-3, round flat washers 1-4, and hexagonal square nuts 1-5 in sequence using a torque wrench;

[0068] 7) After fastening the left sub-housing 1-1 and the right sub-housing 1-2, use a torque wrench to cross-tighten the hexagonal external square bolts 1-6 at the lower ends of the left sub-housing 1-1 and the right sub-housing 1-2 for fixing to the common base 3;

[0069] 8) Use a 0.02mm feeler gauge to check the six groups of contact surfaces formed after the left sub-cover shell 1-1 and the right sub-cover shell 1-2 are assembled, namely, three groups of contact surfaces formed by the left upper end rib plate 1-1-1 and the two left rib plates 1-1-3 of the left sub-cover shell 1-1 contacting and fitting with the right upper end rib plate 1-2-1 and the two right rib plates 1-2-3 of the right sub-cover shell 1-2, two groups of contact surfaces formed by the left bottom rib plate 1 1-1-9 and the left bottom rib plate 2 1-1-10 of the left sub-cover shell 1-1 contacting and fitting with the mounting surface of the common base 3, and one group of contact surfaces formed by the right bottom rib plate 1-2-6 of the right sub-cover shell 1-2 contacting and fitting with the mounting surface of the common base 3; the assembly is qualified when the 0.02mm feeler gauge slides lightly and linearly along the gaps between the six groups of contact surfaces and the arc head of the 0.02mm feeler gauge does not enter the gaps between the contact surfaces;

[0070] 9) After the housing assembly 1 is installed, engage the pawl of the manual cranking ratchet mechanism 4 with the cranking ring gear in the flywheel assembly, and start manual cranking to observe whether the flywheel assembly in the entire marine diesel generator set shaft system interferes with the housing assembly 1. Observe whether the manual cranking ratchet mechanism 4 interferes with the cranking mechanism avoidance window 1-1-7-2 of the left sub-housing 1-1 during operation. At the same time, observe the flywheel pointer 6 and the cranking ring gear scale value in the flywheel assembly through the flywheel window panel 1-1-6 of the left sub-housing 1-1. Manual cranking for two turns and one marine diesel engine working cycle is sufficient;

[0071] 10) After completing the interference inspection of the shell assembly 1 during the working process of the marine diesel generator set, disengage the pawl of the manual turning ratchet mechanism 4 from the turning ring gear in the flywheel assembly, and then adjust the flywheel window panel 1-1-6 of the left sub-cover shell 1-1 horizontally in the opposite direction along its own two horizontal opening slots 1-1-6-4 to the limit position of the lower vertical plate 1-1-6-3, so that the flywheel window panel 1-1-6 completely covers the flywheel pointer window 1-1-7-1, and manually tighten the butterfly nut 1-1-14, and finally adjust the turning window panel 1-1-8 of the left sub-cover shell 1-1 vertically in the opposite direction along its own two vertical opening slots 1-1-8-4 to the limit position of the lower vertical plate 2 1-1-8-3, so that the turning window panel 1-1-8 completely covers the turning mechanism avoidance window 1-1-7-2. At this point, the installation and adjustment of the entire shell assembly 1 are completed.

[0072] This technical solution can be applied to the efficient installation and low-cost, short-cycle production and manufacturing requirements of shaft flywheel assemblies of various types of marine diesel generator sets. It is easy to promote in the field of marine diesel generator set design and manufacturing, has strong applicability for on-site manufacturing and installation, and the on-site installation method is simple and easy to operate. It has a simple structure and light weight, does not require lifting operations, is easy to install on-site, and has high operating efficiency. According to on-site installation verification, the assembly of the split flywheel assembly cover can be completed in 15 to 20 minutes. It has good versatility and strong applicability for on-site manufacturing and installation, can meet the requirements of mass and serialized manufacturing, and has good practical application effects and promotion value in the field of marine diesel generator set design and manufacturing.

[0073] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0074] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A flywheel assembly protective cover device for a diesel generator set, characterized by: The invention comprises a housing assembly (1) which is arranged between a diesel engine (2) and a generator (5) and is simultaneously fastened and mounted on the upper plate surface of a common base (3) together with the marine diesel engine (2), the manual turning ratchet mechanism (4) and the generator (5). The housing assembly (1) is assembled into one piece by a left sub-housing (1-1) and a right sub-housing (1-2) at an interface position by fastening and positioning them together through multiple sets of connecting fasteners to form an arch-shaped two-lobed split structure. A flywheel pointer window (6) corresponding to the position of a flywheel pointer (6) is formed on the outer wall of the left sub-housing (1-1). The invention relates to a manual cranking ratchet mechanism (4) and a hand cranking mechanism avoidance window (1-1-7-2). The left sub-cover shell (1-1) is provided with a flywheel window plate (1-1-6) and a hand cranking window plate (1-1-8) which are positionally adjustable. The flywheel pointer window (1-1-7-1) and the hand cranking mechanism avoidance window (1-1-7-2) are regulated to be opened or closed by adjusting the fixed positions of the flywheel window plate (1-1-6) and the hand cranking window plate (1-1-8) on the left sub-cover shell (1-1).

2. The flywheel assembly protective cover device for a diesel generator set according to claim 1 is characterized in that: The left sub-cover shell (1-1) comprises a left large curved plate (1-1-7), a left upper end rib plate (1-1-1) fixed on the outer wall of the upper end interface of the left large curved plate (1-1-7), a left handle (1-1-2) fixed on the middle part of the horizontal plate of the left upper end rib plate (1-1-1), a left front end panel (1-1-11) and a left rear end panel (1-1-5) respectively fixed on the front and rear edges of the left large curved plate (1-1-7), a left small curved plate (1-1-4) fixed on the outer wall of the inner edge of the left rear end panel (1-1-5), a fixed A left rib plate (1-1-3) is fixed at the middle of the outer wall at the upper edge of the left rear end panel (1-1-5) and the left small curved plate (1-1-4), a left bottom rib plate 1 (1-1-9) is fixed on the outer wall at the lower edge of the left large curved plate (1-1-7), and a left bottom rib plate 2 (1-1-10) is fixed on the outer wall at the lower edge of the left front end panel (1-1-11). The flywheel pointer window (1-1-7-1) and the winch mechanism avoidance window (1-1-7-2) located below the flywheel pointer window (1-1-7-1) are arranged on the plate surface at the front edge of the left large curved plate (1-1-7).

3. The flywheel assembly protective cover device for a diesel generator set according to claim 2 is characterized in that: The flywheel window plate (1-1-6) comprises an arc plate (1-1-6-1) with horizontal opening chute (1-1-6-4) formed at the upper and lower ends of the plate surface, an upper vertical plate (1-1-6-2) fixed to the middle of the left side of the outer plate surface of the arc plate (1-1-6-1), and two limit lower vertical plates (1-1-6-3) fixed to the left side of the inner plate surface of the arc plate (1-1-6-1). The arc plate (1-1-6-1), the upper vertical plate (1-1-6-2), and the limit lower vertical plate (1-1-6-3) are all made of national standard cold-rolled steel plates through laser cutting as a whole; the left large curved plate (1-1-7) is formed with the plate surface distributed above the flywheel pointer window (1-1-7-1) and Two groups of through holes are provided below, and a cross-slot pan head screw (1-1-12) is fixed on the inner wall of the left large curved plate (1-1-7) by spot welding through the through holes. A circular flat washer (1-1-13) is mounted on the cross-slot pan head screw (1-1-12) and is fixedly connected to the outer wall of the left large curved plate (1-1-7) by spot welding. The cross-slot pan head screw (1-1-12) passes through the horizontal opening slide groove (1-1-6-4) and is adaptively connected to a butterfly nut (1-1-14) with a circular flat washer (1-1-13) fixed at the end by spot welding. The front and rear positions of the flywheel window panel (1-1-6) can be adjusted by loosening or tightening the butterfly nut (1-1-14).

4. The flywheel assembly protective cover device for a diesel generator set according to claim 3 is characterized in that: The window panel (1-1-8) comprises a second arc panel (1-1-8-1) with vertical opening chutes (1-1-8-4) formed on both sides of the panel, a second upper vertical panel (1-1-8-2) fixed to the middle of the upper panel of the second arc panel (1-1-8-1) and located between the two vertical opening chutes (1-1-8-4), and two second limiting lower vertical panels (1-1-8-3) located between the two vertical opening chutes (1-1-8-4) and fixed to the lower panel of the second arc panel (1-1-8-1). The second arc panel (1-1-8-1), the second upper vertical panel (1-1-8-2) and the second limiting lower vertical panel (1-1-8-3) are all made of national standard cold-rolled steel plates through laser cutting as a whole; the panel surface of the left large curved panel (1-1-7) is formed with a splitting Two through holes are arranged above the avoidance window (1-1-7-2) of the winch mechanism, and a cross-slot pan head screw (1-1-12) is fixed to the inner wall surface of the left large curved plate (1-1-7) by spot welding through the through holes from the inner wall of the left large curved plate (1-1-7). The cross-slot pan head screw (1-1-12) is provided with a circular flat washer three (1-1-13) fixedly connected to the outer wall surface of the left large curved plate (1-1-7) by spot welding. The cross-slot pan head screw (1-1-12) passes through the vertical opening slide groove (1-1-8-4) and is adaptively connected to a butterfly nut (1-1-14) with a circular flat washer three (1-1-13) fixed by spot welding at the end thereof. The up and down position of the winch window panel (1-1-8) is adjusted by loosening or tightening the butterfly nut (1-1-14).

5. The flywheel assembly protective cover device for a diesel generator set according to claim 4 is characterized in that: The right sub-cover shell (1-2) comprises a right large curved plate (1-2-7), a right upper end rib plate (1-2-1) fixed on the outer wall at the edge of the upper end interface of the right large curved plate (1-2-7), a right handle (1-2-2) fixed on the middle part of the horizontal plate of the right upper end rib plate (1-2-1), a right front end panel and a right rear end panel (1-2-5) respectively fixed on the front and rear edges of the right large curved plate (1-2-7), a right small curved plate (1-2-4) fixed on the outer wall at the inner edge of the right rear end panel (1-2-5), a right rib plate (1-2-3) fixed on the middle part of the outer wall at the upper end edge of the right small curved plate (1-2-4) and the right rear end panel (1-2-5), and a right bottom rib plate (1-2-6) fixed on the outer wall at the lower edge of the right large curved plate (1-2-7).

6. The flywheel assembly protective cover device for a diesel generator set according to claim 5, characterized in that: The left upper end rib plate (1-1-1), the left side rib plate (1-1-3), the left bottom rib plate one (1-1-9), the left bottom rib plate two (1-1-10), the right upper end rib plate (1-2-1), the right side rib plate (1-2-3), and the right bottom rib plate (1-2-6) are all made of angle steel in the national standard hot-rolled steel section; the left small curved plate (1-1-4), the left rear end panel (1-1-5), the left large curved plate (1-1-7), the left front end panel (1-1-11), the right small curved plate (1-2-4), the right rear end panel (1-2-5), the right large curved plate (1-2-7), and the right front end panel are all made of steel plates in the national standard cold-rolled steel section.

7. The flywheel assembly protective cover device for a diesel generator set according to claim 6, characterized in that: The connecting fasteners include a hexagonal square bolt (1-3), a round flat washer (1-4) and a hexagonal square nut (1-5); the left upper end rib plate (1-1-1) and the left side rib plate (1-1-3) on the left side sub-housing (1-1) correspond to the right upper end rib plate (1-2-1) and the right side rib plate (1-2-3) on the right side sub-housing (1-2) respectively, and are connected by multiple sets of hexagonal square bolts (1-3), round flat washers (1-4) and hexagonal square nuts (1-5). The left side sub-housing (1-1) and the right side sub-housing (1-2) are fixedly connected and fixed in position by a first hexagonal flat washer (1-4) and a second hexagonal square nut (1-5); the left side bottom rib plate (1-1-9) and the left side bottom rib plate (1-1-10) at the lower end of the left side sub-housing (1-1) and the right side bottom rib plate (1-2-6) at the lower end of the right side sub-housing (1-2) are adapted and fixedly connected to the threaded holes on the common base (3) by multiple groups of second hexagonal square bolts (1-6) and second round flat washers (1-7).

8. The flywheel assembly protective cover device for a diesel generator set according to claim 7, characterized in that: The left front panel (1-1-11) is provided with a flywheel pointer installation avoidance opening (1-1-11-1) and a hand-cranking ratchet mechanism avoidance opening (1-1-11-2) for avoiding the flywheel pointer (6) and the manual hand-cranking ratchet mechanism (4) respectively.

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