Looking at the development and changes of dump trucks from different lifting methods

After years of development, the dump truck has developed many versions in form, but its lifting method has not changed much, and the most used one is the reliable hydraulic power system.In the conventional back flip dump, there are three different lifting devices and two different lifting points.

Next, let's take a look at the advantages and disadvantages of these self-unloading jacks, and which hydraulic jack is more suitable for you according to your own working conditions.

1. Front-mounted hydraulic cylinder

      The common front-mounted hydraulic cylinder on engineering vehicles (we generally refer to as: front jack) adopts a large single-cylinder self-unloading jack. Under the same lifting load, due to the principle of leverage, the lifting force required by the front-mounted front jack is relatively large. Small (the impact force on the top seat and the beam is small, and it is stable when the top is lifted), and the lateral rigidity of the car is large when it is lifted. 

      But the cylinder piston stroke is longer. (That is to say, compared with the center roof, when the car is lifted to the same height, the cylinder piston length of the front roof is longer than that of the center roof.

      In order to avoid the distance of the hydraulic oil pipes being too long, the hydraulic oil tanks on the front roof are generally placed at the front of the compartment behind the cab, occupying a part of the space and occupying a disadvantage in the overall length of the vehicle body.

       The supporting surface of the front-mounted hydraulic roof is the front panel of the carriage, and a thick iron plate is usually used to lock the supporting points of the hydraulic roof tightly on it.

        The front-mounted hydraulic jack is very popular among urban muck trucks with a short body wheelbase and short cabin length. With its excellent hydraulic capability, it is also chosen by some owners of the front four and rear eight cars.

Summarize:It is better than a thick cylinder block, has excellent hydraulic capacity, and occupies more space. It is mostly suitable for construction site vehicles and heavy-duty vehicles.

2. Central hydraulic roof

The middle-mounted hydraulic roof is divided into: double-cylinder hydraulic roof, referred to as: double roof, and horizontal single-cylinder hydraulic roof.

Center-mounted double roofs, which can effectively lower the center of gravity of the vehicle and increase the stability of the jacking when the container is short.

        The center-mounted double-roof is generally the standard configuration of single-axle dump trucks. It is light in weight and low in the center of gravity, which has become the reason for many customers to choose the center-mounted double-roof.

The support surface of the center-mounted hydraulic roof is generally at the front center of the car model. If conditions permit, the more forward the installation position, the more labor-saving.

Because the overall weight of the hydraulic jack is distributed below the girder, and the hydraulic oil tank is generally located in the space inside the girder, the overall weight is in the lower part. Naturally, the center of gravity is a little lower than that of the front-mounted hydraulic jack. For frequent running On some bumpy and rough road sections, the advantages of the mid-mounted type will be brought into play.

(Middle-mounted hydraulic double-top "basin seat", support surface)

Summarize: Low center of gravity, light weight, better flexibility, more suitable for lightweight road-oriented dump trucks.

Horizontal single-cylinder hydraulic center roof, simple and practical, cost-effective, durable and not easy   to damage.

The middle-mounted hydraulic roof, which is called the engineering roof, is also called the horizontal roof because it lies inside the vehicle frame when it is in a contracted state.

The support surface of the horizontal roof is also in the front middle of the carriage, but because of its own weight, it is rarely selected by road transport-oriented vehicles. However, on the construction site and on heavy cargo, the reliability and lifting capacity of the horizontal roof are quite excellent. Compared with the horizontal roof of the front-mounted hydraulic roof, it can save a lot of space.

Summarize: Reliable working performance, its advantages are more prominent in engineering vehicles.

In conventional dump trucks, due to the length of the carriage, the dump roof generally needs to reach a height of more than 1.7 meters to be capable of tilting the cargo, and the hydraulic roof at the rear end is generally thinner.

Therefore, there are also requirements for the strength of the piston cylinder. In order to meet the requirements of some engineering operations, the rollover self-unloading structure also emerged as the times require, and the length of the rollover self-unloading roof is not so high.

The overall length is not even half the height of the hydraulic roof with the double roof in the middle, and they are arranged in a row at the bottom of the carriage.

（The use of rollover is more common on semi-trailers and long compartments）

The invention of the dump truck has really facilitated a lot of engineering operations. In today's product selection, each product has its own advantages and disadvantages relative to the working conditions it is most suitable for. Whether it is the front top or the middle top, they have all experienced tempering in the long-term market.

(Warm reminder)   Over the years, there have been many accidents due to hydraulic jacks from unloading trucks. In the case of a full load of goods, this Optimus Prime is very important. When choosing hydraulic jacks, try to choose some relatively well-known and reliable brands. High reliability, choose a hydraulic jack that is relatively suitable for you according to your own working conditions.