At present, the cabs of heavy-duty trucks in China have been flattened. In order to improve the overturning speed of heavy truck cab, electric/manual hydraulic overturning mechanism is widely used in medium and large trucks. In order to facilitate engine maintenance, it is necessary to flip the driver's cab, which can greatly improve the safety and reliability of heavy-duty trucks when flipping the driver's cab. The cab flipping structure is suitable for trucks with a capacity of 10 to 50 tons or more; Compared with ordinary hydraulic flipping mechanisms, electric/manual hydraulic flipping mechanisms have a dual safety structure compared to torsion bar flipping mechanisms. This device integrates electric and manual flipping mechanisms, using a plunger pump to drive the hydraulic cylinder, replacing manual with electric, greatly shortening the flipping cycle and improving efficiency. By changing the direction of movement of the hydraulic cylinder through the on-off valve, the front support point of the cab is flipped to the center. The entire ascent process takes about 30 seconds, and the descent process takes less than 20 seconds. Then, let's have a detailed explanation of the overturning structure of the heavy-duty truck cab!
The working principle of a manual pump is the same as that of an electric pump, except that the plunger of the manual pump is pressed up and down by the control lever to pump oil. When the manual pump is working, the electric pump is locked by a one-way valve.
Installation position of inverter group
The electric/manual hydraulic cab flipping mechanism has the advantages of small volume, light weight, and high load-bearing pressure. The device is installed below the rear of the cab, and one end of the hydraulic cylinder is installed on the main beam of the cab, making the installation and maintenance of the vehicle safer and simpler. The other end is installed on the side frame of the rack through a tripod. The oil pump device is installed in the combined space of the driver's cab and carriage for easy operation.
Operation of the cab flipping mechanism
The cab flipping mechanism is flexibly connected to the frame through a locking mechanism and a spring. At this point, the pump is in a no power state and does not work.
The action of the reversing mechanism when the cab rises
When confirming that the cab flipping mechanism can be safely lifted, release the safety pin, rotate the reversing valve handle to the "up" position, start the motor, or manually drive the reversing pump to lift the cab to the desired position, stop the motor, and activate the safety device
The working state of the reversing mechanism during cab reset
Maintenance personnel can leave the bottom of the cab or manually drive the overturning pump to return the cab to its original position within 20 seconds. Then, after cleaning all tools and removed parts, release the locking mechanism, rotate the directional valve to the "down" position, start the motor, and insert the safety pin to prevent lifting the cab when the vehicle is not needed due to misoperation.
From the above introduction, we can conclude that the heavy-duty truck cab flipping mechanism must pay attention to flexibility during operation, which requires regular and thorough inspection.