The utility model has the effect of automatically opening the rear door of the device by using the lifting angle of the tipping bucket, and controlling the locking of the rear door through the arranged air cylinder. As long as the material strength of the door hook allows, it can work back and forth indefinitely. The working stroke of the door hook is long, even if the back door is warped within the range of 100mm relative to the tipping surface, it can be locked reliably and is not affected by the deformation of the back door.
Strong stress and reliable operation can meet the installation and use of large-tonnage dump trucks. Because of the pneumatic switch control, the opening angle of the back door can be set at will to meet the working requirements. The control device can be used directly on the basis of the original vehicle without changing the original locking mechanism, and the two sets of devices can be used at the same time without interference.
The utility model discloses an automatic control device for the back door of a heavy-duty dump truck, which comprises a back door hinged at the back of a dump bucket, a door hook is arranged between the back door and a dump bucket underframe, and the other end of the door hook is hinged with a door hook control cylinder fixed on the frame, so that an air pipe on the cylinder is connected with a pneumatic switch, and a switch pressure plate is installed on the dump bucket underframe corresponding to the upper part of the pneumatic switch.
The device is not affected by the deformation of the back door, and has reliable operation, arbitrary opening angle and flexible action.