First, the wreckers are divided into four types, ie, the type of lifting and supporting, the type of suspension and connection, the flat type and the ordinary type according to the structure type. The lift-off separation type includes two types of rotation and non-rotation of the boom.
Regarding the code of the wrecker, we have made a detailed introduction to the third edition of the fourth edition of the “Changtong†newspaper. Please refer to it.
2. Wreckers with specifications of 3 tons, 5 tons, 8 tons, 20 tons, etc., which people often say, actually refer to the level of the carrying capacity of the chassis used by this kind of wrecker. It has a certain relationship with the total mass of the towed vehicle, but there is no inevitable connection. The larger the tonnage, the wrecker's operating capacity is correspondingly larger.
3. When wreckers are to be taken off (dragging) vehicles from the scene, they generally use two methods: care and drag. Support is to use the support arm of the wrecker to be lifted and pulled by the trolley. Dragging, that is, people often say hard drag, is the use of the wrecker will be hard to pull the trailer to drive.
The wrecker's detaining ability must meet the following two conditions.
(1) The weight of the supporting arm is not greater than the lifting weight of the wrecker, and the lifting weight of the lifting arm gradually decreases as the supporting arm lengthens.
(2) The quality of the rated care must not exceed its maximum total mass. That is to say, the total mass of the vehicles that are taken care of must not exceed the maximum total mass of the wrecker. For example, in the 5140TQZ wrecker, the total mass of the vehicle that is being held is not to exceed 14 tons at first, and the weight of the lifting point of the care arm is also considered to be within the rated lifting mass range.
Wrestling ability of wreckers is related to the maximum total mass of the wrecker and engine power. Article 3.6 of GB7258 “Technical Conditions for Operational Safety of Motor Vehicles†stipulates that the specific power of motor vehicles shall not be less than 4.8 kW/t, and the dragging and pulling capacity of the wrecker must meet this requirement. For example, for a 5140TQZ wrecker, the maximum gross mass G is 14000kg, and the engine power is 132kW. Then the dragging quality G* of the wrecker must meet: G+G*≤132/4.8X1000, that is, G*≤ 13500 kg.
From the above results, it can be seen that due to the matching of the bearing and the engine when considering the design of the chassis, the refitted wrecker has the same dragging and pulling capabilities. For safety, it should be used according to this regulation.
Fourth, the use of the car's operation, precautions, etc., manufacturers in the use of the instructions are described in detail, the following simple talk:
1. Before arriving at the site, first understand the situation of the operating object, so as to select an appropriate wrecker vehicle model for operation;
2. Wreckers must separate PTOs under driving conditions;
3. Before the wrecker is removed, it is necessary to clearly see the direction and direction of the action sign and the second action.
4. When using the boom and winch for lifting and pulling operation, the winch clutch must not be separated. The wire rope must retain at least 5 turns on the winch drum. Use the winch wire rope to pull as much as possible during the operation. Do not arbitrarily extend and change the boom. Do not overload the boom when using it so as not to damage the boom and cause a safety accident.
5. When using the support arm, one must choose the lifting position. Secondly, consider lifting the lifting arm as far as possible, but do not interfere when driving. After lifting the vehicle, be sure to use the chain and the strap to assist the connection of the vehicle. In order to avoid the brakes, bumps and other reasons during the driving process, the tow truck and the wrecker will be separated from each other, thereby damaging the towed vehicle or causing a safety accident.
6, arm, leg, care arm and other movable parts must pay attention to safety within the scope of their operations.
7. If the working time is long, pay attention to the temperature of the hydraulic oil must not exceed 60 °C, especially in continuous operation under high temperature environment, it should pay more attention to inspection to prevent the oil temperature is too high. (Generally, the corresponding tubing of the multi-way valve being operated is touched by the hand. If it feels hot and cannot stay on the tubing, the oil temperature should be considered too high).
8. When the wrecker is driving in the car, due to the influence of road conditions, braking, steering and other factors, it must be noted that the driving speed cannot be too fast. The high-grade road should not exceed 50Km/h, and the mountain road and uneven road should not exceed 30Km. /h, to avoid damage to the vehicle or safety incidents.
9, try to avoid overload or partial load.
10. The maintenance and inspection of wreckers should be carried out regularly to ensure the normal use of wreckers and extend the service life of wreckers.
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