CN219966977U - On-spot prosthetic devices of boats and ships host computer bent axle main journal - Google Patents

Abstract

The utility model provides a field repairing device for a crankshaft main journal of a ship host, which comprises a portal frame, a crankshaft fixing seat, a tool rest assembly and a main bearing seat, wherein the portal frame is used for hanging out and fixing a host frequency modulation wheel, the crankshaft fixing seat is used for supporting and fixing a crankshaft, the tool rest assembly is provided with a milling cutter device and a polishing device, the main bearing seat is used for installing the crankshaft fixing seat and the tool rest assembly, the crankshaft fixing seat is arranged at the front end of the main bearing seat, and the tool rest assembly is arranged at one side of the main bearing seat. The on-site repairing device for the main journal of the crankshaft of the ship main engine realizes on-site repairing under the conditions that large main engine parts such as a frame, a crankshaft, a machine seat and the like are not dismounted, lifted and taken out of a cabin, so that the efficiency and the safety of construction are improved, and the repairing period and the cost are effectively shortened. The crankshaft does not need to be dismantled, so that the engineering quantity is reduced, and the repair period is saved; the portal frame has simple structure, safety, reliability, large bearing capacity and convenient disassembly and reinstallation of the host machine frequency modulation wheel; the movement of the crankshaft in the rotation process can be effectively prevented; the tool rest assembly is reasonable in design, can be applied to crankshafts with various sizes, and is high in applicability.

Description

On-spot prosthetic devices of boats and ships host computer bent axle main journal

Technical Field

The utility model belongs to the technical field of ship repair equipment, and particularly relates to a field repair device for a main journal of a crankshaft of a ship main engine.

Background

When the large ship main engine crankshaft is in poor lubrication, oil is dirty, the engine base or the ship body is deformed, the bearing clearance is improper or overload operation is carried out, the main journal is easy to be subjected to excessive abrasion or severe scratch, and cracks are generated when severe, so that the main engine crankshaft needs to be repaired and maintained in factories.

Due to the lack of proper field machining equipment and technology, at present, domestic shipyards commonly choose to hoist and discharge crankshafts with damaged main journal positions to a workshop for repair, however, the following defects exist:

1. the crankshaft is taken out of the cabin, a hoisting process hole is required to be cut off at the top of the cabin right above the main engine in advance, and a large number of pipelines influencing the taking out of the cabin are removed, so that the workload is huge.

2. The crankshaft can be lifted out after the main frame is lifted out of the cabin by manufacturing a hundred-ton lifting appliance, the cabin-out difficulty is high, and the lifting risk is high.

3. The number of host components and system lines that need to be disassembled and reinstalled increases the maintenance cycle and costs accordingly.

Therefore, it is necessary to invent a machining device and method for repairing damaged crank journal and main bearing housing holes on site without dismantling the crank shaft and frame, so as to improve the efficiency and safety of construction and effectively shorten the repair period and cost.

Disclosure of Invention

The utility model provides a field repairing device for a main journal of a crankshaft of a ship main engine, which can effectively solve the problems.

The utility model is realized in the following way:

the on-site repairing device for the main journal of the crankshaft of the ship host comprises a portal frame for hanging out and fixing a main machine frequency modulation wheel, a crankshaft fixing seat for supporting and fixing the crankshaft, a tool rest assembly for mounting a milling device and a polishing device, and a main bearing seat for mounting the crankshaft fixing seat and the tool rest assembly, wherein the crankshaft fixing seat is arranged at the front end of the main bearing seat, and the tool rest assembly is arranged at one side of the main bearing seat.

The portal frame is equipped with frame, preceding supporting leg, back supporting leg, girder, secondary beam, gusset 1.6, preceding lug, back lug, preceding supporting leg and back supporting leg are "V" shape and span and be fixed in the frame both sides, girder and secondary beam weld in preceding supporting leg and back supporting leg top, preceding supporting leg, back supporting leg and girder, secondary beam are connected to the gusset, preceding lug and back lug weld respectively in preceding, back girder below.

As a further improvement, a backing plate is arranged between the front supporting leg and the back supporting leg and between the machine base.

As a further improvement, a connecting angle steel is arranged between the front supporting leg and the rear supporting leg.

The crankshaft fixing seat is provided with a main panel, a bottom plate, H-shaped steel, a sliding groove, a frame, an adjusting seat and a saddle seat, wherein the bottom plate is perpendicular to the main panel, the H-shaped steel is arranged on two sides of the bottom plate, the sliding groove is fixed on the opposite inner side face of the H-shaped steel, an adjusting jackscrew is arranged on the sliding groove, the frame is fixed on the outer side face of the H-shaped steel, the frame is in an n shape, the adjusting seat is arranged on the bottom plate below the sliding groove, the adjusting seat consists of a seamless steel pipe and a nut, the saddle seat is arranged on two sides of the frame, the top of the frame and the inside of the sliding groove, and the saddle seat on the frame is provided with the jackscrew for installation.

As a further improvement, the saddle is provided with nylon blocks.

As a further improvement, the connection between the main panel and the bottom panel is provided with a reinforcing gusset.

As a further improvement, the main panel is provided with a long bolt hole.

The tool rest assembly is provided with a tool rest fixing seat, an L-shaped pressing block, a position adjusting plate, a front and back feeding device, a wedge-shaped transition plate and an upper and lower feeding device, wherein the L-shaped pressing block and the position adjusting plate are arranged on the upper side and the lower side of the front and back feeding device, and the front and back feeding device is arranged on the tool rest fixing seat; the upper and lower feeding devices are locked with the mounting plates of the front and rear feeding devices through wedge-shaped transition plates.

The milling device is provided with a motor seat, an oil motor, a cutter shaft sheath and a milling cutter, wherein the motor seat is provided with a motor mounting flange and a motor seat main panel, the motor seat is mounted on the upper and lower feeding devices through the motor seat main panel, and the motor mounting flange is arranged on the motor seat main panel; the oil motor is arranged on the motor mounting flange, the milling cutter is connected with the oil motor through a cutter shaft, the cutter shaft is arranged in a cutter shaft sheath, and the cutter shaft sheath is fixed on the motor seat main panel.

As a further improvement, the lower bearing seat plate of the upper and lower feeding device is provided with a horizontal jackscrew opposite to the main panel of the motor seat.

The polishing device is provided with a connecting plate, an oilstone, a pressing mechanism and a vibrating mechanism, wherein the connecting plate is arranged on the upper and lower feeding device, the vibrating mechanism is fixed on the connecting plate, the pressing mechanism is fixed on the vibrating mechanism, and the oilstone is arranged at the front end of the pressing mechanism.

The beneficial effects of the utility model are as follows: the on-site repair device for the main journal of the crankshaft of the ship main engine can repair damaged journal of the crankshaft and main bearing seat holes on site under the conditions that large main engine parts such as a frame, a crankshaft, a machine seat and the like are not dismounted, lifted and taken out of a cabin, especially for large ships, so that the construction efficiency and safety are improved, and the repair period and cost are effectively shortened. The crankshaft does not need to be dismantled, so that the engineering quantity is reduced, and the repair period is saved; the portal frame has simple structure, safety, reliability, large bearing capacity and convenient disassembly and reinstallation of the host machine frequency modulation wheel; the crankshaft is tightly pressed by the crankshaft fixing seat, so that the movement of the crankshaft in the rotation process can be effectively prevented; the tool rest assembly is reasonable in design, the tool can be adjusted to the position right above the crankshaft through the front-back feeding device, the upper-lower feeding device, the wedge-shaped transition plate and the jackscrew, and the tool rest assembly can be applied to crankshafts with various sizes and has high applicability.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some examples of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic structural view of a main journal field repairing device for a main crankshaft of a marine main engine;

FIG. 2 is a schematic view of a portal frame of a device for repairing a main journal of a crankshaft of a marine main engine in situ;

FIG. 3 is a schematic view of a crankshaft fixing seat of a main crankshaft journal field repairing device of a marine main engine;

FIG. 4 is an exploded view of a crankshaft fixing seat of a main crankshaft journal field repairing device of a marine main engine;

FIG. 5 is a schematic view of a tool rest assembly of a field repair device for a crankshaft main journal of a marine main engine of the present utility model;

FIG. 6 is an exploded view of a tool rest assembly of the on-site repair device for a crankshaft main journal of a marine main engine of the present utility model;

FIG. 7 is an assembled structure diagram of a milling device of a main journal field repairing device of a main crankshaft of a marine main engine;

fig. 8 is an assembled structure diagram of a finishing device of a main journal field repairing device of a main crankshaft of a marine main engine.

Reference numerals:

1-a portal frame; 1.1-a stand; 1.2-front support legs; 1.3-rear support legs; 1.4-main beams; 1.5-secondary beams; 1.6-gussets; 1.7-front lifting lugs; 1.8-rear lifting lugs; 1.9-backing plate; 1.10-connecting angle steel; 2-a crankshaft fixing seat; 2.1-a main panel; 2.2-a bottom plate; 2.3-H-shaped steel; 2.4-sliding grooves; 2.5-frames; 2.6-adjusting seat; 2.7-saddle; 2.8-nylon blocks; 2.9-reinforcing gussets; 2.10-long bolt holes; 2.11-crankshaft flange shoulder; 3-a tool holder assembly; 3.1-a knife rest fixing seat; 3.2-L-shaped briquettes; 3.3-position adjustment plate; 3.4-front and rear feeding devices; 3.5-wedge-shaped transition plates; 3.6-up and down feeding device; 3.7-horizontal jackscrews; 4-a milling device; 4.1-motor seat; 4.1.1-motor mounting flange; 4.1.2-motor mount main panel; 4.2-oil motor; 4.3-cutter shaft sheath; 4.4-milling tool; 5-a polishing device; 5.1-connecting plates; 5.2-oilstones; 5.3-a pressing mechanism; 5.4-vibrating mechanism; 6-a main bearing seat; 6.1-an ultra-long bolt; 6.2-main journal; 6.3-crank.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. All other embodiments, based on the embodiments of the utility model, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the utility model. Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model.

In the description of the present utility model, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the description of the present utility model, the terms "upper," "middle," "side," "upper," "end," and the like refer to an orientation or positional relationship based on that shown in the drawings, merely for convenience of description and to simplify the description, rather than to indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the utility model.

Referring to fig. 1-8, a field repair device for a main journal of a crankshaft of a marine main engine mainly comprises: the portal frame 1 is used for assisting in lifting and fixing the host frequency modulation wheel; the fixing seat 2 is used for supporting and fixing the crankshaft and preventing the crankshaft from moving during processing; a tool holder assembly 3 for fixing a machining tool; milling means 4 for milling the journal locations of the crankshafts; a super finishing device 5 for finishing the journal location, etc.

The portal frame 1, as shown in fig. 2, is used for repairing the crankshaft by field machining, and the frequency modulation wheel at the front end of the host machine needs to be disassembled in advance. However, the frequency-modulated wheel is heavy and cannot be lifted out by the cabin crane, so that a special lifting portal frame 1 needs to be designed and manufactured.

The front support leg 1.2 and the rear support leg 1.3, a backing plate 1.9, a connecting angle steel 1.10, a main beam 1.4, a secondary beam 1.5, a gusset plate 1.6, a front lifting lug 1.7, a rear lifting lug 1.8 and the like.

The front support leg and the rear support leg span across two sides of the base 1.1, and a large backing plate 1.9 is arranged below the front support leg and the rear support leg, so that the pressure intensity on the bottom plate can be effectively reduced; the supporting legs are reinforced by connecting angle steel 1.10; the main beam 1.4 and the secondary beam 1.5 are welded above the supporting legs and are additionally reinforced by gusset plates 1.6 and reinforcing plates; a front lifting lug 1.7 and a rear lifting lug 1.8 are respectively welded below the front main girder 1.4 and the rear main girder 1.4.

When the main machine frequency modulation wheel is disassembled, after all bolts are loosened, hanging slings on process holes of the frequency modulation wheel, then lifting the frequency modulation wheel by a little by using a chain block on a rear lifting lug 1.8, gradually tightening a chain on a front lifting lug block, loosening the chain on the rear lifting lug block, slowly pulling out the frequency modulation wheel by about-1000 mm, and gradually transferring the pulling force of the frequency modulation wheel to the front lifting lug 1.9. And similarly, the frequency modulation wheel is assembled back in the reverse order after repair.

As shown in fig. 3-4, the crankshaft fixing seat 2 is provided with 10 long bolt holes 2.10 on the main panel 2.1, and the installation long bolts can be connected with the host machine base; two H-shaped steel 2.3 and two adjusting seats 2.6 are welded on the bottom plate 2.2, and are welded with the main panel 2.1 through 8 reinforcing gussets 2.9; 6 screw holes are drilled on the outer side of the H-shaped steel 2.3 and used for fixing the frame 2.5 by mounting bolts, a chute 2.4 is welded on the inner side of the H-shaped steel, screw holes are drilled on the chute, and the front and rear positions of the lower saddle 2.7 can be adjusted after the jackscrews are mounted; the adjusting seat 2.6 consists of a seamless steel tube and a nut, and can be used for adjusting the height position of the lower saddle seat 2.7 after the jackscrew is installed, so that the saddle seat is perfectly attached to the crankshaft.

The frame 2.5 is formed by welding channel steel and steel plates, 3 threaded holes are formed in the upper, left and right parts of the inner side, small threads on two sides are used for installing jackscrews to adjust the position of the saddle 2.7, and a large threaded hole in the middle is used for installing bolts to fix the saddle 2.7.

The nylon block 2.8 is arranged above the saddle 2.7 and used for supporting the crankshaft flange shoulder 2.11, and has the same function as a sliding bearing.

The tool rest assembly 3, as shown in fig. 5-6, is provided with four round holes on the tool rest fixing seat 3.1, and can be fixed on the lower main bearing seat 6 through lengthening bolts, and a threaded hole is drilled on the panel of the tool rest fixing seat 3.1 for installing the L-shaped pressing block 3.2 and the position adjusting plate 3.3.

The front and rear feeding device 3.4 is pressed and fixed on the panel by the L-shaped pressing block 3.2, and the height and horizontal position of the front and rear feeding device is adjusted by jackscrews on the position adjusting plate 3.3.

The wedge-shaped transition plate 3.5 is used for connecting the front and rear feeding devices 3.4 with the upper and lower feeding devices 3.6; the lower bearing seat plate of the upper and lower feeding device 3.6 is provided with a threaded hole, and a horizontal jackscrew 3.7 can be installed for adjusting the high and low horizontal positions of the motor seat 4.1.

The tool rest assembly 3 is arranged on one side of the main bearing seat 6, the main bearing seat 6 is provided with a crank 6.3, the crank 6.3 is connected with the front and back feeding devices 3.4 through a chain, or the crank can be connected with the upper and lower feeding devices 3.6, or the front and back feeding devices 3.4 and the upper and lower feeding devices 3.6 are directly provided with a rotation adjusting mechanism to realize adjustment.

As shown in fig. 7, the milling device 4 is driven by hydraulic pressure, the oil motor 4.2 is mounted on the motor mounting flange 4.1.1 of the motor base, and the cutter shaft sheath 4.3 is connected with the main panel 4.1.2 of the motor base through bolts.

The motor mounting flange 4.1.1 on the upper part of the motor seat 4.1 is used for mounting the oil motor 4.2 for controlling the cutter, and the motor seat 4.1 and the upper and lower feeding devices 3.6 can be fixed together through waist-shaped holes on the main panel 4.1.2 of the motor seat.

Three machining tools are needed during milling, the surface of a 4.4a cutter disc of the milling tool is small and is used for rough machining of a crankshaft, and all deep cracks can be efficiently and quickly milled and removed so as to determine at least the machining removal amount of the journal; the milling cutter 4.4b has a large cutter disc surface, is used for finish machining of a crankshaft, and can machine and smooth the journal position after rough machining; the milling cutter 4.4c is used for chamfering the edges of the machined journal positions, so that stress concentration is avoided.

The super polishing device 5 is shown in fig. 8, the super polishing device 5 is connected with the tool rest assembly 3 by a connecting plate 5.1, and a grinding head adopts fine abrasive particles and low-hardness oilstone 5.2. During processing, the jigger on the ship drives the crankshaft to rotate, the pneumatic pressing mechanism 5.3 acts on the oilstone 5.2 with constant force to lightly press the journal, and the vibrating mechanism 5.4 performs axial micro vibration, so that the oilstone is driven to polish the micro uneven surface of the journal. The pneumatic pressing mechanism 5.3 and the vibrating mechanism 5.4 are pressing devices and vibrating devices which are conventionally used in the prior art.

In order to further understand the on-site repair device for the main journal of the main crankshaft of the ship, the on-site repair processing process for the main journal of the main crankshaft of the ship is described with reference to fig. 1-8.

The main engine tail shaft and the middle shaft are used for dismantling large-sized components such as a main engine cylinder cover, a piston rod, a cross head, a connecting rod, a flywheel, a transmission chain, a shock absorber and the like; removing all close-fitting bolts of the middle shaft and a flywheel side flange of the main machine, and after the middle shaft and the tail shaft are moved backwards by 2-3 mm, fastening work of a locking tool is realized on site, a flange pair of the tail shaft of the middle shaft is fixed, and the rotation and front-back movement of the middle shaft and the tail shaft are prevented; the bracket tool on site is used for assisting, the weight of the front part of the center shaft is balanced and supported, the deformation of the axis caused by overlong suspension time of the front part of the center shaft is prevented, and the on-site repair work of the crankshaft can be carried out; during the inspection and repair of the crank disc, an additional ventilator is used for ventilation and cooling the motor of the jigger in a matching way; and (3) spraying clean lubricating oil between the nylon block and the flange shoulder of the crankshaft and between each main journal and the lower bearing bush for lubrication after each disc moves the crankshaft for 2-3 circles.

The specific implementation mode is as follows:

1. dismantling the frequency modulation wheel:

1) Removing all bolts between the frequency modulation wheel and the crankshaft;

2) Hanging slings on the process holes of the frequency modulation wheel, and hanging hand-pulling blocks on the rear lifting lug 1.8 and the front lifting lug 1.7;

3) The frequency modulation wheel is lifted a little by a chain block on the rear lifting lug;

4) Gradually tightening the chain on the front lifting lug chain block, and slowly loosening the chain on the rear lifting lug chain block, slowly pulling out the frequency modulation wheel by about 1000mm, so that the pulling force of the frequency modulation wheel is gradually transferred to the front lifting lug (1.9);

5) Slowly lowering the frequency modulation wheel to the wood pad pier below to reduce the stress of the lifting lug.

2. And (3) mounting a crankshaft fixing seat:

1) Removing all main bearing caps and upper bearing bushes, and then taking out the lower bearing bushes at the main journal positions to be repaired by using a special tool;

2) The lower bearing bushes at the rest main journal positions are removed and inspected in batches by using a tool, and after the main journal and the lower bearing bushes are confirmed to be all intact, the lower bearing bushes are cleaned and reinstalled;

3) The pressing plate and the sleeve tool are used for acting on and fixing the lower bearing bushes of the rest main journals, and the lower bearing bushes are fixedly pressed by the fixing bolts and nuts of the upper cover of the main bearing, so that the lower bearing bushes are prevented from being slipped out during turning;

4) The crankshaft fixing seat 2 is arranged at the front end of the engine base (the position where the hydraulic damping type axial shock absorber is originally arranged) by using a long bolt;

5) The jackscrews on the adjusting seat 2.6 and the sliding groove 2.4 are screwed, and the position of the lower saddle 2.7 is adjusted, so that the nylon block 2.8 is perfectly attached to the outer circular surface of the crankshaft flange shoulder 2.11 (the position where the frequency modulation wheel is originally arranged);

6) And installing the frame 2.5, screwing jackscrews, adjusting the positions of the upper saddle seat 2.7, the left saddle seat and the right saddle seat, and tightening bolts to fix the saddle seat 2.7 after the nylon blocks 2.8 are well attached to the outer circle of the flange. At the moment, the nylon blocks 2.8 are well attached to the outer circular surface of the crankshaft flange shoulder 2.11, and play a role of a sliding bearing.

3. Mounting a milling device:

1) The tool rest fixing seat 3.1 is arranged on one side of the main bearing seat 6 by using an ultra-long bolt 6.1, as shown in figure 1;

2) Under the cooperation of the upper and lower feeding devices 3.6, the milling device 4 is placed right above the journal position;

3) A dial indicator is arranged on the upper frame of the cutter shaft, and the cutter shaft is moved at a speed as small as possible through the front and rear feeding device 3.4 to read the percentage representation number;

4) According to the difference value of the readings of the dial indicator, adjusting jackscrews on the tool rest assembly 3, and adjusting the axis of the tool shaft to be perpendicular to the axis of the crankshaft;

5) All fastening bolts on the tool rest assembly 3 are locked, the gauge is hit again, and the axis condition of the tool shaft is checked and confirmed.

4. Clearance of crankshaft cracks:

1) Mounting a milling cutter a, and placing the lower end of the cutter at a position about 10mm right above the repaired main journal 6.2 through an up-down feeding device;

2) The main engine jigger is started to enable the crankshaft to slowly rotate, and then the oil motor 4.2 is started to drive the cutter to perform efficient and rapid milling operation on the journal. Before feeding downwards, turning off the jigger, and checking whether the crack is completely clear. Repeating feeding, and performing magnetic powder inspection and matching inspection until the crack root is completely milled and cleaned;

3) And uniformly taking points in a circular m shape, grinding the surface after removing cracks, and measuring the hardness of the surface of the journal by using a hardness tester on site, wherein the hardness value is required to meet the requirements of a design specification. Otherwise, the surface of the journal after rough machining needs to be subjected to on-site heat treatment so as to improve the hardness of the surface of the journal, and finish machining can be continued.

5. Journal milling finish machining:

1) Checking the crank value of each cylinder of the main engine crankshaft, and meeting the requirements of a design specification;

2) Replacing the milling cutter b, and checking and confirming the axial line condition of the cutter by using a dial indicator again;

3) Moving the cutter to the front end of the journal position through a front-back feeding device, and moving the cutter to a position about 10mm above the journal position through an up-down feeding device;

4) Starting a main engine turning machine to enable a crankshaft to slowly rotate, and then starting an oil motor 4.2 to drive a cutter to mill the journal until the surface is smooth and round;

5) And accurately measuring the size of the finished journal by using a special outside micrometer.

(1) Journal position edge rounding processing

And replacing the milling cutter tool c, and carrying out fine machining on the fillet transition position on the edge of the journal position so as to avoid stress concentration.

(2) Super polishing machining of journal

1) Dismantling the milling device, and installing the super polishing device in place through the connecting plate 5.1;

2) The oilstone 5.2 is adjusted to be right above the shaft neck position through a front-back, upper-lower adjusting mechanism and a horizontal jackscrew 3.7;

3) Starting the turning machine, switching on the air source of the super polishing machine, and starting polishing operation. In the machining process, kerosene polishing liquid is required to be continuously injected between the oilstone and the crankshaft for cooling, lubricating and chip removal. At this time, under the action of the pressing mechanism 5.3 and the vibrating mechanism 5.4, the oilstone 5.2 is lightly pressed on the crankshaft journal with constant force and simultaneously performs axial micro vibration, so as to polish the journal position;

4) After the journal is processed to be smooth, the contact area of the oilstone 5.2 and the crankshaft is gradually increased, the pressure is gradually reduced, a finished lubricating oil film is gradually formed between the surfaces, so that the cutting action is gradually weakened, and finally, the cutting action is automatically stopped;

5) Stopping turning, closing an air source, checking the journal position by using a roughness measuring instrument, and dismantling the super polishing device if the Ra values are all larger than 1.6 mu m;

6) And according to the polished journal size, using a special template die to test the roundness and contact area of the polished and ground crankshaft journal.

6. Blue oil test:

1) And (3) performing a blue oil test on the journal position of the crankshaft by using a special template die, wherein the journal contact surface is required to be uniformly distributed, and the contact area is more than 75% of the total area. So far, the engineering of repairing the crankshaft on site is completed;

2) Measuring the size of the finally processed journal by using the special size;

3) And (3) according to the measured sizes of the new main journal and the main bearing seat hole, the thickened upper bearing bush and the thickened lower bearing bush are prepared again.

Finally, according to the reverse sequence and the marks before disassembly, the complete parts are checked by the systems, after the whole oil channeling check and the qualification of the system, the oil pressing, water pressing and air tightness check are respectively carried out on the system, and the mooring test and the sailing test are respectively carried out on the host machine.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, and various modifications and variations may be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (10)

1. The on-site repairing device for the main journal of the crankshaft of the ship host machine is characterized by comprising a portal frame (1) for hanging out and fixing a main machine frequency modulation wheel, a crankshaft fixing seat (2) for supporting and fixing the crankshaft, a tool rest assembly (3) for installing a milling device (4) and a polishing device (5), and a main bearing seat (6) for installing the crankshaft fixing seat (2) and the tool rest assembly (3), wherein the crankshaft fixing seat (2) is arranged at the front end of the main bearing seat (6), and the tool rest assembly (3) is arranged at one side of the main bearing seat (6).

2. The on-site repair device for the main journals of the crankshafts of marine main engines according to claim 1, wherein the portal frame (1) is provided with a frame (1.1), a front supporting leg (1.2), a rear supporting leg (1.3), a main girder (1.4), a secondary girder (1.5), a gusset plate (1.6), a front lifting lug (1.7) and a rear lifting lug (1.8), the front supporting leg (1.2) and the rear supporting leg (1.3) are transversely fixed on two sides of the frame in a V shape, the main girder (1.4) and the secondary girder (1.5) are welded above the front supporting leg (1.2) and the rear supporting leg (1.3), the gusset plate (1.6) is connected with the front supporting leg (1.2), the rear supporting leg (1.3) and the main girder (1.4) and the secondary girder (1.5), the front lifting lug (1.7) and the rear lifting lug (1.8) are respectively welded under the front main girder (1.4), and the rear lifting lug (1.3) are provided with a base plate (1.9).

3. The on-site repair device for the main journals of the crankshafts of marine main engines according to claim 2, wherein a connecting angle steel (1.10) is arranged between the front supporting leg (1.2) and the rear supporting leg (1.3).

4. The on-site repair device for the crankshaft main journal of the marine main engine according to claim 1, wherein the crankshaft fixing seat (2) is provided with a main panel (2.1), a bottom plate (2.2), H-shaped steel (2.3), sliding grooves (2.4), a frame (2.5), an adjusting seat (2.6) and a saddle seat (2.7), the bottom plate (2.2) is vertically arranged with the main panel (2.1), the H-shaped steel (2.3) is arranged on two sides of the bottom plate (2.2), the sliding grooves (2.4) are fixed on the opposite inner sides of the H-shaped steel (2.3), adjusting jackscrews are arranged on the sliding grooves (2.4), the frame (2.5) is fixed on the outer side of the H-shaped steel (2.3), the frame (2.5) is in an n-shaped shape, the adjusting seat (2.6) is arranged on the bottom plate (2.2) below the sliding grooves (2.4), the adjusting seat (2.6) is composed of seamless steel pipes and saddle nuts, and the saddle seat (2.7) is arranged on two sides of the frame (2.5) and the saddle seat (2.7).

5. The on-site repair device for the main journals of crankshafts of marine main engines according to claim 4, wherein a reinforcing gusset plate (2.9) is arranged at the joint of the main panel (2.1) and the bottom plate (2.2).

6. The on-site repair device for the main journal of the crankshaft of the marine main engine according to claim 4, wherein the main panel (2.1) is provided with a long bolt hole (2.10).

7. The on-site repair device for the main journals of the crankshafts of marine main engines according to claim 1, wherein the tool rest assembly (3) is provided with a tool rest fixing seat (3.1), an L-shaped pressing block (3.2), a position adjusting plate (3.3), a front and rear feeding device (3.4), a wedge-shaped transition plate (3.5) and an upper and lower feeding device (3.6), the L-shaped pressing block (3.2) and the position adjusting plate (3.3) are arranged on the upper side and the lower side of the front and rear feeding device (3.4), and the front and rear feeding device (3.4) is arranged on the tool rest fixing seat (3.1); the upper and lower feeding devices (3.6) are locked with the mounting plates of the front and rear feeding devices (3.4) through wedge-shaped transition plates (3.5).

8. The on-site repair device for the main journals of the crankshafts of marine main engines according to claim 1, characterized in that the milling device (4) is provided with a motor seat (4.1), an oil motor (4.2), a cutter shaft jacket (4.3) and a milling cutter (4.4), the motor seat (4.1) is provided with a motor mounting flange (4.1.1) and a motor seat main panel (4.1.2), the motor seat (4.1) is mounted on the upper and lower feeding devices (3.6) through the motor seat main panel (4.1.2), and the motor mounting flange (4.1.1) is arranged on the motor seat main panel (4.1.2); the oil motor (4.2) is arranged on the motor mounting flange (4.1.1), the milling cutter (4.4) is connected with the oil motor (4.2) through a cutter shaft, the cutter shaft is arranged in a cutter shaft sheath (4.3), and the cutter shaft sheath (4.3) is fixed on the motor seat main panel (4.1.2).

9. The on-site repair device for the main journals of the crankshafts of a marine main engine according to claim 8, wherein the lower bearing seat plate of the upper and lower feeding devices (3.6) is provided with horizontal jackscrews (3.7) opposite to the main panel (4.1.2) of the motor seat.

10. The on-site repair device for the main journals of the crankshafts of marine main engines according to claim 1, wherein the polishing device (5) is provided with a connecting plate (5.1), an oilstone (5.2), a pressing mechanism (5.3) and a vibrating mechanism (5.4), the connecting plate (5.1) is arranged on an upper and lower feeding device (3.6), the vibrating mechanism (5.4) is fixed on the connecting plate (5.1), the pressing mechanism (5.3) is fixed on the vibrating mechanism (5.4), and the oilstone (5.2) is arranged at the front end of the pressing mechanism (5.3).