With the development of the modern logistics industry, semi trailers have already replaced ordinary trucks to become the main force in the field of long-distance transportation. Every day there are countless semi trucks carrying a variety of goods on the road. However, due to its huge volume and its unique structural characteristics, semi trailer in the actual driving operation and ordinary vehicles have a really large difference, especially when reversing compared with ordinary vehicles is a world of difference.
I believe that there are numerous card friends who are just in contact with the semi-trailer, for the semi-trailer reversing operation is not really understood, frequently make mistakes when reversing, causing some accidents. Do we have any minor skills and rules when carrying out semi-mounted astern? And I'm going to explain that to you today. Check out the Semi Trailer price here.
Ten Laws of driving a semi astern
The law of self-convergence of the Angle between the main vehicle and the trailer when the semi-trailer is moving forward. The angle between the main vehicle and the trailer will remain unchanged or gradually decrease when the semi-trailer is moving forward, whether it is straight forward or turning forward. The angle is convergent and will not diverge by itself. That is, when we drive the semi-trailer forward, whether straight or turning, we don't have to worry about the increasing angle between the main car and the trailer, so that the main car and trailer twisted into a ball. That is, driving forward is relatively easy because the line of sight is excellent and the vehicle is self-controlled.
The law of self-divergence of the Angle between the main car and the trailer in reverse semi-trailer. When semi-mounted reverse, whether it is straight back, or turn back, the angle between the main car and trailer will not remain unchanged by itself, nor will it gradually decrease by itself, this Angle is gradually increasing by itself, is divergent. That is, when we drive the semi-trailer backwards, we must effectively control the running track of the semi-trailer by turning the steering wheel properly, so that the angle between the main car and the trailer is kept in a controllable range, so that it will not diverge quickly and twist into a twisted ball. That is, it is relatively difficult to reverse back often, because the line of sight is not excellent, a lot of dead space, the vehicle is not controllable, the need for human control.
The LAW of RESTRAINING THE DIVERGENCE OF THE Angle BETWEEN THE MAIN CAR and the TRAILER in STRAIGHT REVERSE SEMI-trailer. Reversing in a straight line is the most basic and the easiest. Straight back down, if you find the car rear corner left, you should have a slight amount of left direction, the trailer will be straightened back; if you find THAT THE REAR CORNER OF THE CAR is tilted to the right, you should turn slightly to the right and the trailer will straighten out.
Four, half - hang turn reverse law. Turning back, we should think of some way to get the car in the direction of the turn between the trailer and form a right Angle (operation method: to turn the steering wheel in the opposite direction of the reverse direction), and then keep the Angle of the same (operation method: double growth for the reverse direction to the steering wheel), can achieve after turning down. The slower the bend, the smaller the angle between the main vehicle and the trailer; the sharper the bend, the greater the angle between the main car and the trailer.
Five, half hang turn reverse, THE main car and trailer Angle between the equilibrium state of the establishment, destruction and recovery law (steering wheel fewer play extra back law). For example, turn to the right rear to reverse, between the main car and trailer to the right has formed a suitable Angle, and keep this Angle unchanged reverse, to achieve a state of balance. If you turn the steering wheel to the left 30 degrees, the balance between the angle between the main car and the trailer is broken. After a while, the angle between the main car and the trailer will become larger. If the larger Angle between the main vehicle and the trailer is needed to maintain the same, that is, the Angle between the main vehicle and the trailer is restored to the equilibrium state, it is necessary to turn the steering wheel more than 30 degrees to the right at this time. That is, if the steering wheel turns 30 degrees to the left and the balance is broken, it is not feasible to turn 30 degrees to the right. Only when the steering wheel turns more than 30 degrees to the right can the angle between the main vehicle and the trailer be restored to the balance state. This is the half - hung reverse steering wheel without play back to the law.
The LAW OF RETRACTING AND MAINTAINING THE Angle BETWEEN THE MAIN CAR AND THE TRAILER. For example, we need to turn right Angle to the left after the direction, if first to the right to play the steering wheel 40 degrees, so that between the main car and trailer left to form more and more larger Angle. This process is called put. When an appropriate Angle has been formed between the main vehicle and the trailer, if the steering wheel is quickly turned to the left 80 degrees at this time, the Angle between the main vehicle and the trailer can remain unchanged and reach a state of balance, which is called maintaining. At the end of the turn reverse stage, quickly left the steering wheel to the end, so that the main car and trailer between the Angle quickly reduced, so that the car back to the positive, this process is called. The smaller the angle between the main vehicle and the trailer, the easier it is to recover, and the time to recover can be delayed; the larger the angle between the main car and the trailer, the more difficult it is to recover, and the time to recover should be earlier. Complex reverse tasks (such as reverse S-turns) may not have the "hold" process in between. Then it is put first, then hurry to recycle; then put it in the opposite direction, and then hurry to retrieve it. As for the extent to which recycling should be carried out, that is, how to determine the timing of recycling, this depends on experience.
Seven, half - hang reverse, strategic foresight type play direction back direction law. When backing up the semi, the Angle between the main car and the trailer can not be enlarged at a time, and the Angle between the main car and the trailer can not be reduced at a time. You need to be strategic and you need to anticipate. The longer the trailer, the longer THE releasing AND REtracting process will be, and the more EARLY releasing and REtracting actions will be required.
Eight, half - mounted turn reverse, the front and the rear of the car law. Because the semi truck is extremely tall, turning astern, the main car and trailer formed by the radius of rotation is usually extremely large, the difference between the inner and outer wheels is also extremely large. When there are obstacles around the reversing field, it is easy to have a scratch accident if the front of the car is ignored or the rear of the car is ignored. Then you have to do both the front and the rear.
Nine, half - hung reverse, must repeatedly play the steering wheel law. In semi-mounted reverse, no matter it is to reverse straight, reverse turn, reverse S-turn, side parking and other more complex reverse tasks, it is indispensable to repeatedly turn the steering wheel in both left and right directions. Reverse half hang, repeatedly driving the steering wheel is not a problem, but a necessity. Anyone can't reverse a car by turning the steering wheel in only one direction. The difference between the master and the novice is: the master can complete the reverse wheel with the minimum number of times (such as reversing to the right Angle turn, the master started to turn the steering wheel to the left, on the way to the right, the steering wheel to keep the bend, at the end of the right to the steering wheel straight, in theory only 3 times; of course, you may need to swing the steering wheel a few times to correct the error. And the novices because play the steering wheel without rules, more with blindness, random, random, the steering wheel repeatedly played non-stop, tired sufficiently, the failure rate is elevated.
10. The law of inherent advantages of semi-trailer compared with bicycles. Now long-distance freight trucks are essentially semi - mounted. Have you thought about that? Why does half-hang have such a large advantage? You may think the semi-trailer is not tall? If the bike car is that tall, why not the semi? You can't have a bike car that looks like a half-hitch. The driveshaft is as tall as the carriage is tall, and too tall a driveshaft is too heavy to bear; and the trailer is tall, the main car drive shaft is extremely short, not easy to break. In addition, when the main vehicle of semi-trailer and the trailer form a 90 degree angle, the trailer can realize the turn in situ, that is, the narrow and tall trailer can complete the action of sharp turn in a tiny field. And a bicycle can't turn in place, that is, a narrow bicycle turn is stupid. Although the trailer is tall, the main car is extremely short, turning extremely flexible, and then can drive the trailer to turn out of sharp corners. In addition, the semitrailer can realize towing transportation, and one locomotive can successively pull several trailers. And the bicycle can not be slang transport, carriage loading and unloading, the front of the car can not move to pull additional carriages.