About the method of reducing the impact of hydraulic trucks

About the method of reducing the impact of hydraulic trucks

The hydraulic truck is the most common manual carrier at present, because its 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, it is lightly unloaded and shockproof during the transportation process to reduce unnecessary damage to the equipment, which is the guarantee for the safe arrival of the equipment. However, the existing trucks are difficult to meet the requirements due to functional defects, and there are often incidents of falling cargoes, or even smashing the cargo and its own vehicle body, and there are certain safety hazards. The main reason for these problems is the start-up process (see Figure 1a) caused by the structure, function, type and working performance of the hydraulic oil filling valve of the truck. Increase the negative pressure, the hydraulic oil in the oil pool pushes the steel ball into the cavity under the action of atmospheric pressure 1. When the hand pump rocker is pressed down, the volume of the plunger pump decreases, and the formed pressure oil closes the steel ball At the same time, it overcomes the spring force and pushes open the cone valve core to inject oil into the hydraulic cylinder through cavity 2. At this time, the hydraulic cylinder rises to drive the pallet of the pallet truck to rise. The oil injection flow and lifting speed are determined by the frequency of manual operation of the hand pump rocker. List the flow expressions for the oil filler valve for illustration.

In order to simplify the description of the problem, set the flow coefficient c and the geometric index m of the valve port to 1, and substitute equation (1) into equation (2), then the hydraulic cylinder speed is:

In the formula, F is the area of ​​the hydraulic cylinder plunger. When the cargo is unloaded, the manual power rod pushes the unloading pin of the oil filling valve to move upward, and drives the steel ball to push the poppet valve core to open upward, then the valve cavity 2 is connected with the cavity 1, and the manual The pressure pump does not pump oil, and the pressure oil generated by the gravity of the cargo returns to the oil pool. Since the flow direction of the pressure oil is reversed, that is, p1 becomes p 2 and p2 becomes p 1, formula (3) can be expressed as:

It can be seen from the structure and function of the oil injection valve that the pressure p 1 increases with the increase of the weight of the cargo, while the annular area of ​​the oil passage where the poppet spool is located remains unchanged, the pressure oil return damping is basically unchanged, and the back pressure remains unchanged. The pressure p 2 is very low, and it can be known from equation (4) that: the load increases, the speed of the hydraulic cylinder increases, but the rapid drop of the heavy object causes the impact, and even damages the goods and smashes the car body.

is a modern pallet stacker truck widely used in +pallet +truck +manufacturer industry. It also enhances the quality portable pallet jack value of the products.
See reviews of the latest trend in pallet stacker truck industry at Staxx Pallet Truck, and see the best that work in just minutes! Visit us right away!
High-quality products are huge boosts when it comes to marketing ideas; allowing potential manufacturers to place themselves in the shoes of a satisfied customer brings them one step closer to understanding the idea of pallet stacker truck.