1, select the parking space. When the wrecker arrives at the scene of the accident, the site should be surveyed first, and the main vehicle parking point and the accident vehicle lift should be selected. A flatter place should be chosen for parking. At the same time, it is necessary to estimate the weight of the crane when it is actually hoisted. Observe whether the crane is within the working range of the boom and try to make the main vehicle close to the crane. The distance to the crane should be taken into consideration when selecting the parking spot, including the space covered by the maximum telescopic stroke, up-tilt angle and horizontal rotation radius of the boom on the premise of meeting the lifting weight, and the space required for clearing or avoiding the rotation of the boom. In addition, special measures such as avoidance or power failure are taken for obstacles that cannot be removed, such as aerial cables that may be touched.
2. Put the wrecker into the parking spot, hang the neutral, pull the handbrake, and hang the second gear so that the power take-off can be engaged. Operate and control the outstretching of the legs before and after the right and left legs (two stop pins on the left and right legs of the back leg must be pinned to prevent the external force from retracting and causing danger), so that the wheels are about 20 to 50 mm off the ground. If the floor of the leg is soft, add a sleeper to the plug pad.
3, clean up the towed vehicle. No persons are allowed to stop in the accident car. Cargoes and objects that may affect lifting shall be unloaded to reduce weight. The weight of the lift shall be controlled within the prescribed range, and the impact of the object on the car body shall be reduced. The possibility of danger.
4. Select the place where the boom hook is hooked on the accident vehicle. It is required that the hook or lanyard must have enough strength to withstand the weight of the vehicle itself.
5. Pull out the rotating hanger stop pin, rotate the wrecker arm to the direction of the crane, extend the jib so that the top end of the jib is above the vertical center of the crane (estimated), and put down the steel cable to prepare to hang the crane. The joints must be connected before and during the hung, and the steel cables must not be twisted. Operate the height of the shrinking cable to keep the balance of the lifting object and increase it at a constant speed to prevent it from rolling over. When the accident vehicle is lifted to a certain height, rotate the boom to the open space and put it down. During the entire lifting process, the boom is not allowed to flex. During the rotation process, pay close attention to whether or not the main support brace leg is in a sagging state, and if it is found that there is significant subsidence, the operation should be stopped immediately.
6, after the boom can be extended to lift heavy objects from a very high point, this time must not be too much unilateral load and make the vehicle center of gravity out of the safe range, with particular attention should be paid to the vertical center of the rotating boom and wrecker When the line is in a right angle state, it is extremely easy for the wrecker to overturn because the load moment is too large. Generally, it can determine or judge the force allowed state of the boom at the time according to the crane lifting ability curve.
7. When the lifting work is completed, the boom should be fully retracted and rotated to lower the home position and lock the rotating seat. The cable reel of the hinged discs should be neatly arranged. When shrinking the steel cable, pay attention to timely control of the handle when the hook pulley is nearing its end, and do not damage the device to break the cable or cause the cable to collapse. Then all the legs are taken back and reset.
There are three basic types of fixed bed reactor: (1) axial adiabatic fixed bed reactor. The fluid flows through the bed along the axial direction, and there is no heat exchange between the bed and the outside world. (2) radial adiabatic fixed bed reactor. The fluid flows through the bed along the radial direction. Centrifugal flow or centripetal flow can be adopted. There is no heat exchange between the bed and the outside world. Compared with axial reactor, radial reactor has shorter flow distance, larger cross-sectional area and smaller fluid pressure drop. But the structure of radial reactor is more complicated than that of axial reactor. The above two forms are adiabatic reactors, suitable for the reaction heat effect is not large, or the reaction system can withstand adiabatic conditions caused by the reaction heat effect of the temperature changes. (3) The tubular fixed-bed reactor is composed of multiple reaction tubes in parallel. The catalyst is arranged in the tube or between the tubes, and the heat carrier flows through the tubes or tubes for heating or cooling. The diameter of the tubes is usually between 25 ~ 50mm, and the number of tubes can be as many as tens of thousands of roots. The tubular fixed bed reactor is suitable for the reaction with high thermal effect. In addition, there is a reactor composed of the above basic forms in series, called a multistage fixed bed reactor.
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