Dismounting device for main bearing cap of large-cylinder-diameter diesel engine

Abstract

The utility model discloses a large-cylinder-diameter diesel engine main bearing cap dismounting device which comprises a hoisting unit, lower sliding rail assemblies and a main bearing cap supporting unit, hoisting sliding rail assemblies of the hoisting unit are fixed to the two sides of the upper portion of a rack, and the lower sliding rail assemblies are supported on oil pan rib plates respectively. Supporting rods of the main bearing cover supporting unit are vertically supported at the two ends of the beam respectively, the upper ends of the supporting rods are fixedly connected with the lower ends of main bearing cover screws respectively, the lower ends of the supporting rods are hinged to the two ends of the beam respectively, and a top block of the main bearing cover supporting unit is fixedly connected with the center of the lower side of the main bearing cover. According to the main bearing cap dismounting device, the working efficiency of dismounting the main bearing cap and the operation safety are remarkably improved, the labor intensity of dismounting the main bearing cap is greatly reduced, and the problem of dismounting the main bearing cap of a large-cylinder-diameter diesel engine is solved.

Description

Technical Field

[0001] The utility model relates to a disassembly device for diesel engine components, in particular to a disassembly device for the main bearing cap of a large-bore diesel engine with a cylinder diameter above φ450mm, belonging to the technical field of diesel engine maintenance. Background Technique

[0002] With the increasingly wide application of large container ships, the cylinder diameter of their power plants - marine medium-speed diesel engines is also getting larger and larger, and there are more and more large-bore diesel engines with a cylinder diameter above φ450mm. During the maintenance process, it is inevitable to disassemble the main bearing cap. The main bearing cap and hydraulic tools of large-bore diesel engines are large in volume, heavy in weight, and have a small operating space inside the engine. Multiple people need to cooperate. Without special disassembly tools and disassembly methods, safety accidents are extremely likely to occur.

[0003] The hydraulic tools for disassembling the main bearing cap of small-bore diesel engines generally adopt a split design, and each component can be manually assisted to be carried into the engine and then assembled into a complete tooling for the disassembly operation of the main bearing cap. However, the thread diameter of the screw for fixing the main bearing cap of large-bore diesel engines is relatively large. For example, the thread diameter of the screw of the main bearing cap of a certain type of marine diesel engine is M90×6, and the weight of the hydraulic tool used for its disassembly is about 70 - 100 kg. If a split structure is adopted, it cannot be carried by manpower and external force assistance is required for operation. The large volume and heavy weight of the hydraulic tool increase the operation difficulty during in-engine assembly. When using an integral hydraulic tool for disassembly by manual assisted lifting, it not only seriously affects the disassembly efficiency but also has relatively large potential safety hazards. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a disassembly device for the main bearing cap of a large-bore diesel engine with a compact structure, time-saving and labor-saving operation, and safe and reliable use.

[0005] The utility model is realized through the following technical solutions:

[0006] A dismounting device for the main bearing cover of a large-bore diesel engine, comprising a hoisting unit respectively installed on both sides of the upper part of the frame, a lower slide rail assembly arranged in pairs on the upper part of the oil pan, and a main bearing cover support unit. The hoisting unit includes a hoisting slide rail assembly, a hoisting trolley, a hydraulic stretcher, and a hoist. The middle part of the horizontally arranged hoisting slide rail assembly is symmetrically fixed on both sides of the upper part of the frame, and one end of the hoisting slide rail assembly extends into the upper part of the frame respectively; a pair of rollers are respectively provided at both ends of the vertical plate of the hoisting trolley, and the rollers are respectively supported on both sides of the hoisting slide rail assembly. The lower side of the vertical plate extends out of the lower side of the hoisting slide rail assembly. The upper hook of the hoist is hooked on the lower part of the vertical plate, and the lower hook of the hoist is hooked on the middle part of the hoisting steel wire rope. Both ends of the hoisting steel wire rope are connected to the lifting rings on both sides of the hydraulic stretcher; the lower slide rail assembly is a segmented splicing structure and is respectively supported on the oil pan rib plates through brackets; the main bearing cover support unit is in a trident shape, including a cross beam, two support rods, a central support oil cylinder, and a top block. The support rods are respectively vertically supported on both ends of the cross beam, the upper ends of the support rods are respectively fixedly connected to the lower ends of the main bearing cover screws, the lower ends of the support rods are respectively hinged to both ends of the cross beam, the upper end of the central support oil cylinder is vertically fixed on the lower side of the center of the cross beam, the piston rod of the central support oil cylinder vertically passes through the center of the cross beam upwards, and the top block is fixed on the top of the piston rod. The upper side of the top block is fixedly connected to the center of the lower side of the main bearing cover.

[0007] The object of the present utility model can also be further achieved by the following technical measures.

[0008] Further, the hoisting slide rail assembly includes a pair of L-shaped rails, a fixing plate, several connecting plates, a pair of rib plates, and a pair of support rods. The bottom edges of the pair of L-shaped rails are arranged oppositely, and both ends of the pair of L-shaped rails are welded into a rectangular structure through connecting plates respectively. Several connecting plates are welded and fixed at intervals on the upper side of the pair of L-shaped rails. The lower central notch of the vertically arranged fixing plate is welded and fixed on the middle part of the pair of L-shaped rails. One end of the hoisting slide rail assembly extends into the upper part of the frame respectively, and the end of one end of the hoisting slide rail assembly is supported on the inner partition of the frame; rib plates are respectively welded between the lower part of the outer side of the fixing plate and the vertical edges of the pair of L-shaped rails outside the frame, and support rods are respectively welded at both ends between the lower part of the inner side of the fixing plate and the vertical edges of the pair of L-shaped rails inside the frame; the rollers at both ends of the vertical plate of the hoisting trolley are respectively supported on the inner side surfaces of the bottom edges of the L-shaped rails; a locking mechanism is further provided between one L-shaped rail and the vertical plate.

[0009] Further, the locking mechanism includes an L-shaped locking rod, a vertical plate locking hole, and L-shaped rail locking holes respectively arranged at both ends of one L-shaped rail. When the hoisting trolley is respectively located at the ends of the L-shaped rails, one end of the L-shaped locking rod sequentially passes through the corresponding L-shaped rail locking hole and the vertical plate locking hole, and the hoisting trolley is respectively locked at both ends of the hoisting slide rail assembly.

[0010] Further, the lower slide rail assembly with a segmented splicing structure includes a first slide rail, a T-shaped middle slide rail, and a second slide rail whose ends are adjacent in sequence and are located inside one end of the machine frame, and a third slide rail located inside the other end of the machine frame. The cross-section of each slide rail is in a groove shape, and the lower sides of the 3 rolling steel ball assemblies at the bottom of the hydraulic stretcher are respectively supported on the groove bottoms of the lower slide rail assembly; the lower sides of both ends of each slide rail are respectively fixed on their corresponding brackets, and the lower parts of the brackets are respectively fixed on both sides of the bottom of the oil pan rib groove; the first slide rail, the T-shaped middle slide rail, and the second slide rail are equal in length and respectively match the corresponding spacing of the oil pan rib, and the length of the third slide rail is respectively greater than the lengths of the first slide rail, the T-shaped middle slide rail, and the second slide rail.

[0011] Further, the lower sides of the middle parts of the slide rails corresponding to the central positions of the main bearing cap screws are respectively supported by adjustable support rods between the upper side of the oil pan bottom plate.

[0012] Further, a cross-connecting assembly is provided between one ends of the adjacent sides of a pair of T-shaped middle slide rails. The cross-connecting assembly includes a cross-link rod and 2 cross-connecting seats. The cross-connecting seats are respectively welded and fixed on one ends of the adjacent sides of the T-shaped middle slide rails. The ends of the cross-link rod respectively extend into the cross-connecting seats and are fastened with nuts; several handles arranged at intervals are respectively welded on both sides of the first slide rail, both sides of the T-shaped middle slide rail, and both sides of the second slide rail.

[0013] Further, the outer diameter of the support rod is smaller than the outer diameter of the main bearing cap screw. The two ends of the support rod respectively extend out an upper screw and a lower screw. The upper screws at the upper ends of the support rods are respectively screwed into the threaded holes at the centers of the lower ends of the main bearing cap screws, and the lower screws at the lower ends of the support rods respectively pass through both ends of the cross beam and are limited by nuts, so that the support rods are respectively hinged to both ends of the cross beam.

[0014] The structure of the present utility model is compact and easy to install. Through the hoisting unit, the hydraulic stretcher can be conveniently sent into the machine frame. With a little external force to push the hydraulic stretcher, it can move along the lower slide rail assembly to the lower side of the main bearing cap to be disassembled, which is convenient for its connection with the main bearing cap screw. The main bearing cap support unit enables the main bearing cap to descend smoothly to complete the disassembly, significantly improving the working efficiency and operation safety of the main bearing cap disassembly, greatly reducing the labor intensity of the main bearing cap disassembly, and solving the problem of the main bearing cap disassembly of large-bore diesel engines.

[0015] The advantages and features of the present utility model will be illustrated and explained through the non-restrictive description of the following preferred embodiments, which are given only as examples with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is the front view of the hoisting unit of the present utility model installed on the large-bore diesel engine frame;

[0017] Figure 2 isFigure 1 A-A sectional view;

[0018] Figure 3 is an enlarged perspective view of the lifting slide rail assembly;

[0019] Figure 4 is a working step diagram of the hydraulic stretcher being fed into the machine frame until it moves to the lower side of the main bearing cover;

[0020] Figure 5 is a perspective view of the lower slide rail assembly installed on the upper part of the oil pan and the main bearing cover support unit supported on the lower side of the main bearing cover.

[0021] Figure 6 is an enlarged schematic diagram of the working state of the main bearing cover support unit. Specific embodiments

[0022] The present utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0023] As Figures 1 to 6 shown, this embodiment includes a lifting unit 1 respectively installed on both sides of the upper part of the machine frame 10, a lower slide rail assembly 2 arranged in pairs on the upper part of the oil pan 20, and a main bearing cover support unit 3. The lifting unit 1 includes a lifting slide rail assembly 11, a hoisting trolley 12, a hydraulic stretcher 13, and a hoist 14.

[0024] The middle part of the horizontally arranged lifting slide rail assembly 11 is symmetrically fixed on both sides of the upper part of the machine frame 10, and a pair of rollers 122 are respectively arranged at both ends of the vertical plate 121 of the hoisting trolley 12.

[0025] As Figure 3 shown, the lifting slide rail assembly 11 includes a pair of L-shaped rails 111, a fixing plate 112, five connecting plates 113, a pair of rib plates 114, and a pair of struts 115 made of angle steel. The bottom sides of the pair of L-shaped rails 111 are arranged opposite to each other, and their two ends are respectively welded into a rectangular structure through the connecting plates 113. Three connecting plates 113 are welded and fixed at intervals on the upper side of the pair of L-shaped rails 111. The lower central notch 1121 of the vertically arranged fixing plate 112 is welded and fixed in the middle part of the pair of L-shaped rails 111. One end of the lifting slide rail assembly 11 extends into the upper part of the machine frame 10 respectively, and the end of the lifting slide rail assembly is supported on the inner partition 101 of the machine frame. The outer lower part of the fixing plate 112 is respectively welded to the vertical sides of the pair of L-shaped rails 111 outside the machine frame 10 through the rib plates 114, and the inner lower part of the fixing plate 112 is respectively welded to the vertical sides of the pair of L-shaped rails 11 inside the machine frame 10 through the two ends of the struts 115. The rollers 122 at both ends of the vertical plate 121 of the hoisting trolley 12 are respectively supported on the inner side surfaces of the bottom sides of the L-shaped rails 11.

[0026] A locking mechanism 15 is also provided between an L-shaped rail 111 and a vertical plate 121. The locking mechanism 15 includes an L-shaped locking rod 151, a vertical plate locking hole 152, and L-shaped rail locking holes 153 respectively arranged at both ends of an L-shaped rail. When the hoisting trolley 12 is respectively located at the ends of the L-shaped rail 111, one end of the L-shaped locking rod 151 sequentially passes through the corresponding L-shaped rail locking hole 153 and the vertical plate locking hole 152, locking the hoisting trolley 12 at both ends of the hoisting slide rail assembly 11 respectively, providing a reliable safety guarantee for the hoisting of the hydraulic stretcher 13.

[0027] The lower side of the vertical plate 121 extends out of the lower side of the hoisting slide rail assembly 11. The upper hook 141 of the hoisting winch 14 is hooked on the lower part of the vertical plate 121. As Figure 4 shown, the lower hook 142 of the hoisting winch 14 is hooked on the middle part of the hoisting steel wire rope 143. Both ends of the hoisting steel wire rope 143 are respectively connected to the sling rings 131 on both sides of the hydraulic stretcher 13.

[0028] As Figure 2 and Figure 5 shown, the lower slide rail assembly 2 is a segmented splicing structure, and is respectively supported on the oil sump rib plate 201 through brackets 25. It includes a first slide rail 21, a T-shaped middle slide rail 22, and a second slide rail 23 that are adjacent to each other in sequence at the ends and are arranged from left to right inside the left end of the frame 10, and a third slide rail 24 located inside the right end of the frame 10. The cross-section of each slide rail is in a groove shape. The lower sides of the 3 rolling steel ball assemblies 132 at the bottom of the hydraulic stretcher 13 are respectively supported on the groove bottom of the lower slide rail assembly 2. Both ends of each slide rail are respectively fixed on their corresponding brackets 25, and the lower parts of the brackets 25 are respectively fixed on both sides of the bottom of the oil sump rib plate notch 2011. The first slide rail 21, the T-shaped middle slide rail 22, and the second slide rail 23 have equal lengths and respectively match the corresponding spacing of the oil sump rib plate 201. Since the spacing of the oil sump rib plate 201 supporting the third slide rail 24 is greater than the spacing of the oil sump rib plate 201 supporting other slide rails, the length of the third slide rail 24 is respectively greater than the lengths of the first slide rail 22, the T-shaped middle slide rail 23, and the second slide rail 24.

[0029] As Figure 2As shown, a cross - connecting assembly 26 is provided between one ends of adjacent sides of the T - shaped middle slide rail 22. The cross - connecting assembly 26 includes a cross - connecting rod 261 and two cross - connecting seats 262. The cross - connecting seats 262 are in a groove shape and are respectively welded and fixed on one ends of adjacent sides of a pair of T - shaped middle slide rails 22. The ends of the cross - connecting rod 261 extend into the cross - connecting seats 262 respectively and are fastened with nuts 263. This facilitates adjusting the center distance of a pair of lower slide rail assemblies 2, which is beneficial for adjusting the center distance of the hydraulic tensioners 13 on the lower slide rail assemblies 2 to align them with the center of the main bearing cap screw 301, and is more convenient for connecting the upper end of the hydraulic tensioner 13 with the lower end of the main bearing cap screw 301. On both sides of the first slide rail 21, both sides of the T - shaped middle slide rail 22, and both sides of the second inner slide rail 23, several handles 264 are welded at intervals, which is convenient for installing the lower slide rail assembly 2 onto the oil pan rib 201.

[0030] As Figure 4 As shown in process C at the right end, an adjustable support rod 4 is provided between the lower side of the middle part of the slide rail corresponding to the center position of the main bearing cap screw 301 and the upper side of the oil pan bottom plate 202. When the hydraulic tensioner 13 stretches the main bearing cap screw 301, the huge tensile force that causes the main bearing cap screw 301 to elastically deform and elongate is transmitted through the bottom of the hydraulic tensioner 13 to the corresponding slide rail of the lower slide rail assembly 2. The adjustable support rod 4 provides an axial support force, effectively preventing the slide rail from bending and deforming. The adjustable support rod 4 in this embodiment adopts a screw sleeve structure that is convenient for adjustment.

[0031] As Figure 5 and Figure 6 As shown, the main bearing cap support unit 3 is in a trident shape and includes a cross - beam 31, two support rods 32, a central support oil cylinder 33, and a top block 34. The support rods 32 are respectively vertically supported at both ends of the cross - beam 31. The outer diameter of the support rod 32 is smaller than the outer diameter of the main bearing cap screw 301, which is convenient for the main bearing nut 302 to pass through the support rod 32 and fall onto the cross - beam 31. Upper screws 321 and lower screws 322 respectively extend from both ends of the support rod 32. The upper screws 321 at the upper ends of the support rods 32 are respectively screwed into the threaded holes 3011 at the centers of the lower ends of the main bearing cap screws 301. The lower screws 322 at the lower ends of the support rods 32 respectively pass through both ends of the cross - beam 31 and are limited by nuts 35, so that the support rods 32 are respectively hinged to both ends of the cross - beam 31. The upper end of the central support oil cylinder 33 is vertically fixed on the lower side of the center of the cross - beam 31. The piston rod 331 of the central support oil cylinder 33 vertically passes through the center of the cross - beam 31 upward, and the top block 34 is fixed on the top of the piston rod 331. After the upper side of the top block 34 abuts against the center of the lower side of the main bearing cap 30, it is fixed on the center of the lower side of the main bearing cap 30 by two screws 35.

[0032] The process of disassembling the main bearing cap 30 using the present utility model is as follows:

[0033] 1) As Figure 2 , Figure 4 andFigure 5 As shown in the figure, first, fix two brackets 25 in a group to the bottom sides of the notches 2011 of each oil pan rib plate with two fastening screws 251 respectively. Then, outside the left end of the oil pan 20, fix the first slide rail 21, the T-shaped middle slide rail 22, and the second slide rail 23 of the lower slide rail assembly 2 to the brackets 25 inside the left end of the frame 10 in sequence, and fix the third slide rail 24 to the brackets 25 inside the right end of the frame 10. Then, connect the two ends of the cross-link 261 to the cross-link seat 262 through nuts 263 respectively, and adjust the center distance A between the two groups of lower slide rail assemblies 2 so that the center distance A is consistent with the center distance B of the main bearing cap screws. Next, support the two ends of the adjustable support rod 4 between the lower side of the middle part of the T-shaped middle slide rail 22 and the upper side of the oil pan bottom plate 202 respectively. The axis of the adjustable support rod 4 corresponds to the center position of the main bearing cap screw 301, and the installation of the lower slide rail assembly 2 and the adjustable support rod 4 is completed.

[0034] 2) As shown in Figure 3 and Figure 4 in working step a, fix the fixing plates 112 in the middle of the lifting slide rail assembly 11 to the upper sides of both sides of the frame 10 respectively, and support the ends of the lifting slide rail assembly 11 extending into the upper part of the frame 10 on the corresponding inner partition plates 101 of the frame. Then, place the lifting trolley 12 into the lifting slide rail assembly 11, and support the four rollers 122 at the bottom of the lifting trolley 11 on the bottom edges of the L-shaped tracks 111 of the lifting slide rail assembly 11 respectively, and complete the installation of the lifting slide rail assembly 11 and the lifting trolley 12.

[0035] 3) As shown in Figure 3 the figure, horizontally pass the L-shaped locking rods 151 through the L-shaped track locking holes 153 at the outer ends of the L-shaped tracks 111 and the vertical plate locking holes 152 of the lifting trolley 12 respectively, and lock the lifting trolley 12 in the outer ends of the lifting slide rail assembly 11.

[0036] 4) As shown in Figure 4 in working step a, hook the upper hooks 141 of the hoist 14 to the lower parts of the vertical plates 121 of the lifting trolley 12 respectively, hook the lower hooks 142 of the hoist 12 to the middle of the hoist wire rope 143 respectively, and connect the two ends of the hoist wire rope 143 to the lifting rings 131 on both sides of the hydraulic stretcher 13 respectively. Then, as shown in Figure 4 in working step b, pull out the L-shaped locking rod 151, and push the lifting trolley 12 with the hydraulic stretcher 13 suspended along the lifting slide rail assembly 11 into the frame 20 respectively until it reaches the inner end of the lifting slide rail assembly 11. Repeat step 3), and lock the lifting trolley 12 with the hydraulic stretcher 13 suspended to the inner ends of the corresponding lifting slide rail assemblies 11 respectively, so as to send the hydraulic stretcher 13 into the frame 10 respectively.

[0037] 5) As shown in Figure 4As shown in the working step c, operate the hoist 14 respectively. The lower hook 142 of the hoist 14 descends, and the hydraulic stretcher 13 descends until the lower sides of the three rolling steel ball assemblies 132 at its bottom are respectively supported on Figure 2 the bottom of the groove of the vertical track 221 of the T-shaped middle slide rail 22 shown. Then remove the hoisting wire rope 143, and push the hydraulic stretcher 13 along the corresponding lower slide rail assembly 2 to the lower side of the main bearing cap screw 301 respectively to complete the positioning operation of the hydraulic stretcher 13.

[0038] 6) Tighten the internal threads on the upper part of the hydraulic stretcher 13 on the corresponding ends of the main bearing cap screws 301 respectively. Then connect the hydraulic stretchers 13 to the high-pressure oil pipes respectively. Use the manual pump to elongate the main bearing cap screws 301 through the hydraulic stretchers respectively to eliminate the pre-tightening force of the main bearing cap nuts 302. Then loosen the main bearing cap nuts 302 respectively and remove the respective hydraulic stretchers 13, and push the hydraulic stretchers 13 along the lower slide rail assembly 2 to the slide rail in the middle of the lower slide rail assembly 2 to complete the loading operation of the hydraulic stretcher 13.

[0039] 7) As Figure 6 shown, first remove the slide rail located under the main bearing cap 30, and then move the main bearing cap support unit 3 to the lower side of the main bearing cap 30, so that the upper screws 321 at the upper ends of the support rods 32 are respectively aligned with the corresponding screw holes 3011 at the ends of the main bearing cap screws. Then turn the support rods 32 with a wrench to screw the upper screws 321 at the upper ends of the support rods 32 into the screw holes 3011 at the ends of the main bearing cap screws respectively, so that the support rods 32 are respectively connected to the corresponding main bearing cap screws 301 as a whole. At the same time, start the central support oil cylinder 33, so that the piston rod 331 of the central support oil cylinder moves upward, and the top block 34 at the end of the piston rod 331 presses against the center of the main bearing cap 30 and is fixedly connected thereto. At this time, the main bearing cap nuts 302 can be removed respectively until they are separated from the main bearing cap screws 301 and fall onto the support rods 32 respectively. Then the piston rod 331 of the central support oil cylinder descends, and the main bearing cap 30 moves downward along the main bearing cap screw 301 and disengages from the main bearing seat 303 until the main bearing cap 30 falls onto the support rods 32. Then after the crane lifting ropes respectively lift the two sides of the main bearing cap 30, remove the threaded connection between the support rods 32 and the main bearing cap screws 301 respectively, and the fixed connection between the top block 34 and the main bearing cap 30. Move the main bearing cap support unit 4 downward to disengage from the main bearing cap screws 301. The crane lifting ropes respectively lift the main bearing cap 30 and move downward to disengage from the main bearing cap screws 301, and then first fall onto the lower slide rail assembly 2 below and then be lifted away to complete the disassembly of the first main bearing cap 30.

[0040] 8) Move the hydraulic stretcher 13 onto the second slide rail 23, and then repeat the processes of steps 4) to 7) to complete the disassembly of the second main bearing cover 30. Then remove the first slide rail 21, move the first slide rail 21 onto the bracket 25 adjacent to the second slide rail 23 and fix it. Again, repeat the processes of steps 4) to 7) to complete the disassembly of the third main bearing cover 30. And so on. Move and fix the left-end slide rail of the three connected slide rails of the lower slide rail assembly 2 to the right end of the lower slide rail assembly 2 in sequence, and then repeat the processes of steps 4) to 7) respectively to complete the disassembly of the main bearing cover 30 one by one.

[0041] In addition to the above embodiments, the present utility model may also have other embodiments. All technical solutions formed by equivalent substitution or equivalent transformation fall within the protection scope required by the present utility model.

Claims

1. A disassembly device for the main bearing cover of a large-bore diesel engine, characterized in that, It includes hoisting units respectively installed on both sides of the upper part of the frame, downward slide rail assemblies arranged in pairs on the upper part of the oil pan, and a main bearing cap support unit. The hoisting unit includes a hoisting slide rail assembly, a hoisting trolley, a hydraulic stretcher, and a hoisting winch. The middle of the horizontally arranged hoisting slide rail assembly is symmetrically fixed on both sides of the upper part of the frame, and one end of the hoisting slide rail assembly extends into the upper part of the frame respectively; on both ends of the vertical plate of the vertically arranged hoisting trolley, a pair of rollers are respectively provided, and the rollers are respectively supported on both sides of the hoisting slide rail assembly. The lower side of the vertical plate extends out of the lower side of the hoisting slide rail assembly. The upper hook of the hoisting winch is hooked on the lower part of the vertical plate, and the lower hook of the hoisting winch is hooked on the middle of the hoisting wire rope. Both ends of the hoisting wire rope are respectively connected to the sling rings on both sides of the hydraulic stretcher; the downward slide rail assembly is a segmented splicing structure and is respectively supported on the oil pan rib plates through brackets; the main bearing cap support unit is in a trident shape and includes a cross beam, two support rods, a central support oil cylinder, and a top block. The support rods are respectively vertically supported on both ends of the cross beam. The upper ends of the support rods are respectively fixedly connected to the lower ends of the main bearing cap screws, and the lower ends of the support rods are respectively hinged to both ends of the cross beam. The upper end of the central support oil cylinder is vertically fixed on the lower side of the center of the cross beam. The piston rod of the central support oil cylinder vertically passes through the center of the cross beam upward, and the top block is fixed on the top of the piston rod. The upper side of the top block is fixedly connected to the center of the lower side of the main bearing cap.

2. The main bearing cap disassembly device for a large-bore diesel engine according to claim 1, characterized in that, The hoisting slide rail assembly includes a pair of L-shaped tracks, a fixing plate, several connecting plates, a pair of rib plates, and a pair of support rods. The bottom edges of the pair of L-shaped tracks are arranged oppositely. Both ends of the pair of L-shaped tracks are welded into a rectangular structure through the connecting plates respectively. Several connecting plates are welded and fixed at intervals on the upper side of the pair of L-shaped tracks. The lower central notch of the vertically arranged fixing plate is welded and fixed on the middle of the pair of L-shaped tracks. One end of the hoisting slide rail assembly extends into the upper part of the frame respectively, and the end of the hoisting slide rail assembly is supported on the inner partition of the frame; between the lower part of the outer side of the fixing plate and the vertical edges of the pair of L-shaped tracks outside the frame, they are respectively welded to the rib plates, and between the lower part of the inner side of the fixing plate and the vertical edges of the pair of L-shaped tracks inside the frame, they are respectively welded to both ends of the support rods; the rollers at both ends of the vertical plate of the hoisting trolley are respectively supported on the inner side surfaces of the bottom edges of the L-shaped tracks; a locking mechanism is also provided between one L-shaped track and the vertical plate.

3. The main bearing cap disassembly device for a large-bore diesel engine according to claim 2, wherein, The locking mechanism includes an L-shaped locking rod, a vertical plate locking hole, and L-shaped track locking holes respectively arranged at both ends of one L-shaped track. When the hoisting trolley is respectively located at the ends of the L-shaped tracks, one end of the L-shaped locking rod sequentially passes through the corresponding L-shaped track locking hole and the vertical plate locking hole, and the hoisting trolley is respectively locked at both ends of the hoisting slide rail assembly.

4. The main bearing cap disassembly device for a large-bore diesel engine according to claim 1, characterized in that, The lower slide rail assembly with a segmented splicing structure includes a first slide rail, a T-shaped middle slide rail, and a second slide rail with adjacent ends and located inside one end of the frame, and a third slide rail located inside the other end of the frame. The cross-section of each slide rail is in a groove shape. The lower sides of the three rolling steel ball assemblies at the bottom of the hydraulic stretcher are respectively supported on the groove bottoms of the lower slide rail assembly; the lower sides of both ends of each slide rail are respectively fixed on their corresponding brackets, and the lower parts of the brackets are respectively fixed on both sides of the bottom of the oil pan rib plate groove; the first slide rail, the T-shaped middle slide rail, and the second slide rail have the same length and are respectively matched with the corresponding spacing of the oil pan rib plate, and the length of the third slide rail is respectively greater than the lengths of the first slide rail, the T-shaped middle slide rail, and the second slide rail.

5. The disassembly device for the main bearing cover of a large-bore diesel engine according to claim 1, wherein, Between the lower side of the middle part of the slide rail corresponding to the center position of the main bearing cap screw and the upper side of the oil pan bottom plate, they are respectively supported by adjustable support rods.

6. The main bearing cap disassembly device for a large-bore diesel engine according to claim 4, characterized in that, A cross-connection assembly is provided between one ends of the adjacent sides of a pair of T-shaped middle slide rails. The cross-connection assembly includes a cross-link rod and two cross-connection seats. The cross-connection seats are respectively welded and fixed on one ends of the adjacent sides of the T-shaped middle slide rails. The ends of the cross-link rod respectively extend into the cross-connection seats and are fastened with nuts; several handles arranged at intervals are respectively welded on both sides of the first slide rail, both sides of the T-shaped middle slide rail, and both sides of the second slide rail.

7. The main bearing cap disassembly device for a large-bore diesel engine according to claim 1, characterized in that, The outer diameter of the support rod is smaller than the outer diameter of the main bearing cap screw. Both ends of the support rod respectively extend out an upper screw and a lower screw. The upper screws at the upper ends of the support rods are respectively screwed into the threaded holes at the center of the lower ends of the main bearing cap screws, and the lower screws at the lower ends of the support rods respectively pass through both ends of the cross beam and are limited by nuts, so that the support rods are respectively hinged to both ends of the cross beam.

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