Impact method of manual hydraulic truck

Impact method of manual truck

pallet trucks are currently the most common manual vehicles, because their use greatly facilitates the transportation of small and medium-sized goods. However, with the increase of the types of goods, the requirements of the goods on the starting state are improved, and the performance requirements of the vehicles are becoming more and more important. Especially when starting and transporting precision equipment, lightly unloading and shock-proofing during the transportation process can reduce unnecessary damage to the equipment, which is the guarantee for the safe arrival of the equipment. However, the existing manual trucks are difficult to meet the requirements due to the defects in function, and there are often accidents of falling goods and even smashing the goods and their own car bodies, which have certain safety hazards. The main reason for these problems is the structure, function, type and working performance of the oil injection valve of the truck.

In the case of not affecting the structure of the existing truck, the structure of the oil injection valve is improved (see Figure 1b). The method is to lengthen the guide tail of the cone valve core, and design the end to be tapered. At the same time, a triangular groove is opened in the radial direction of the cone head of the guide tail to prevent critical vibration, and an additional one is placed on the upper part of the guide tail. The annular swimming damping sleeve makes it and the guide tail form a self-adaptive damping port with the change of load. The working principle is: when the pressure oil from the hand pump goes from chamber 1 to chamber 2, to chamber 3, the cylinder rises. When the cargo falls, the unloading pin pushes the steel ball and the cone valve core to move upward, and the valve port opens, that is, the cone tail also enters the damping sleeve, and the cone tail and the damping sleeve form an annular flow channel hole. As the load increases, the damping sleeve compresses the spring (the force balance equation is omitted), which reduces the flow area of ​​the annular hole. At this time, the pressure of the cavity 3 is p′1 . Referring to formula (4), it can be seen that although p′1 is very high , but the flow area a becomes smaller, the pressure oil return damping increases, the flow decreases, and the corresponding cylinder speed slows down, which overcomes the impact when the heavy object falls and avoids damage to the goods.

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