The working conditions of the tunnel lining trolley are severe and the load is heavy. The experiment proves that the life of the parts of the walking system is the shortest compared with other parts of the lining trolley. Therefore, the walking system must be used and maintained correctly to improve its traffic performance, reduce the power loss of the moving parts, and extend the service life of the machine parts.
(1) When driving, you should operate correctly in accordance with the driving rules and methods to avoid severe vibration and violent impact.
(2) When driving on soft and gravel ground, avoid making sharp turns at large angles, otherwise, it will cause damage to moving parts.
(3) During training, avoid the lining trolley turning frequently in one direction, so as to avoid the pitch difference between the tracks on both sides (when turning, the wear of high-speed tracks is greater than that of low-speed tracks).
(4) According to the terrain and soil quality of the lining trolley, adjust the tightness of the crawlers reasonably to improve the driving performance of the lining trolley.
Walking system maintenance work content
1. Cleaning, inspection and lubrication
(1) Preparation before leaving the vehicle Each time before leaving the vehicle, a visual inspection of the components in the action section is required. The labyrinth oil retaining device of the side wheel allows a small amount of oil leakage.
(2) First-level maintenance removes dirt from all parts. The lining trolley shall check the following items every time after leaving the vehicle, and eliminate it in time when there is a fault.
A. Use visual inspection to check the tightening of the fastening bolts of each part of the action part where visible.
B. Check the tightness of the track (check every 300 ~ 400km).
C. Check the installation of the fixed card board of the pull arm of the friction damper, and replace it if it is lost.
D. Check whether the axle cover of each wheel and the rewinding oil cover leak or overheat during intermittent driving, and prevent loosening and damage of the bearing in time.
E. When the lining trolley travels to 400km in total, the fasteners of all components should be generally tightened once.
F. Regularly inspect the track shoes and wearing parts, and replace them as appropriate.
(3) The second-level maintenance is carried out after driving for 1400 ~ 1600km. In addition to the first-level maintenance, the following contents need to be completed:
A. Check the rubber tires of the load wheels and induction wheels.
B. If oil leakage is found on the wheels of the load-bearing wheel, the induction wheel and the side wheel, the grease of No. 2 lining trolley should be added. The load wheel and the induction wheel should be added to the upper bolt hole until the lubricating oil flows out; the supporting wheel should be added until the oil mark of the self-tightening oil seal of the supporting wheel facing the car body appears.
C. Check the tightening of the nuts of the induction wheel and the load wheel, and the tightening of the bolts of the balance elbow and friction damper.
D. Tighten the fixing screw of the driving wheel.
(4) The third-level maintenance is carried out after driving for 2800 ~ 3200km. Its purpose is to check the technical status of the lining trolley and make full preparations for continued use. In addition to completing the first and second level maintenance, the following content should be added:
A. Visual inspection of load wheels, side wheels, induction wheels and track adjusters, rubber tires, wheel discs, and wrap-around oil retaining rings. If you want to remove the wheel hub of the load-bearing wheel and replace defective parts, you should remove the old grease and clean all parts with diesel. The bearing should be coated with grease during assembly. After the assembly of the load-bearing wheel is completed, open the two bolts coated with red magnetic paint on the end surface of the shaft cover to fill the oil.
B. Check whether the wear amount of the driving ring gear meets the replacement condition.
C. Replenish the balance elbow shaft with grease. Fill 100 to 200g of grease in the oil injection hole at the lower part of the balance elbow bracket (use oil with the load wheel). Add grease to the load wheel, the induction wheel and the side wheel.
D. Check all parts of the crawler for damage, and replace them if they meet the replacement conditions.
2. Inspection and adjustment of crawler tightness
(1) Checking the degree of tightness of the crawlers The inspection and adjustment of the degree of tightness of the crawlers should be carried out on a relatively flat ground. The methods are as follows:
A. Put the track measuring line on the track ribs of the second and third side rollers, pass the line through the track shoe gap, and hang a heavy object.
B. Use a steel ruler to measure the distance from the measuring line to the track ribs (that is, the middle piece between the second and third side rollers). The maximum value of this distance is the overhang of the track. The amount of drape should generally be in the range of 20 ~ 25mm.
(2) Adjustment of track tightness In order to reduce the power loss when the track is rolling, to prevent the track shoe from jumping or climbing on the driving gear teeth, and to prevent the track from falling off during the driving of the vehicle, the track must be adjusted to an appropriate degree of tightness.
When adjusting the track, make sure that the two tracks have the same tightness. The general drape is 20-25mm, but it should be slightly tighter when driving in mountainous or pebble ground to reduce the rolling resistance of the load wheel; in mud, sand and snow, it should be slightly looser to increase the adhesion.
A. Adjustment of track tensioning mechanism.
a. Raise and fix the front fender, and clean the mud at and around the four sides of the worm tail and the six sides of the screw tail.
b. Loosen the screw: Use the special socket wrench and pry bar in the tool to turn the hexagonal head of the screw counterclockwise or clockwise for 1 ~ 1.5 turns to disengage the worm.
c. Adjustment: put the double head of the socket wrench on the tail of the screw and the worm, so that the worm and the screw rotate together. When the pointer on the cheek of the crank is adjusted within 180 ° under the gap of the sleeve, clockwise Turn the socket wrench to induce the wheel to move forward, thereby tightening the track; press the counterclockwise direction to loosen the track. When the cheek of the crank arm is above the gap of the bushing, clockwise rotation will loosen the track; counterclockwise rotation will tighten the track. This position is generally not used.
d. Lock the worm: After the crawler is adjusted, the worm should be locked to prevent it from loosening. The locking is divided into upper locking and lower locking. If the crank arm is facing upward (the pointer on the cheek is above the gap of the bushing), the upper locking is used, and at this time, tighten the screw counterclockwise. If the crank arm is facing down (the pointer on the cheek is below the gap of the sleeve), the lower locking is used. At this time, tighten the screw clockwise, and the locking torque of the screw is 800 ~ 1000N • m.
e. Check the tightness of the track again. After passing the inspection, drive the car forward for a distance of not less than half the length of the car body, and recheck the tightness of the track. If it does not meet the requirements, it should continue to be adjusted to the specified range.
B. Adjust by replacing or reducing track shoes.
When the track adjuster is adjusted to the limit position and the track cannot be tensioned, one track shoe should be removed from each track and then adjusted to the standard tightness.
When the lining trolley deviates due to different lengths of the left and right tracks, part of the track shoes in the two tracks can be interchanged to ensure that the two have the same length.
For the removed or exchanged track shoes, the inclined section between the driving wheel and the sixth load-bearing wheel should be selected. When removing, the upper supporting track must be tightened to loosen the track under the driving wheel. Before tightening the upper support track, a spare track shoe should be placed under any load wheel (except the sixth load wheel) to prevent the lining trolley from sliding.