Search

Email

A     B     C     D     E     F     G     H     I     J     K     L     M     N     O     P     Q     R     S     T     U     V     W     X     Y     Z



  Mobiles  

  F7     F9

 Bookstore

 Tests

 Formulary




Tipper 1 - Constructions



Function

Anything that is rigid cannot absorb great forces, it is more likely to break. Give a thought to the skyscrapers, which at the summit, can sway from 2 to 3 metres. The newest building (2007) in Taiwan even has a very heavy pendulum to keep the oscillations within limits. Why should the truck be any different? Have a look at a semi-trailer, from the rear to the the front along the full length of the loading surface, you will notice that it has a slight hump in the middle. When fully loaded it is probably the other way round.
Therefore, it's not surprising, that the truck chassis must feature a certain amount of flexibility. This is especially important for the rigging manufacturers and for the repairers. By the way, distorted trucks are not, unlike the motor car, repaired on mobile straightening benches, but on an absolutely level concrete floor which contains very solidly mounted rails. On it the hydraulics are mounted to exercise, when required, horizontal and vertical forces.
The most often ordered trucks are without doubt the trailer trucks. The remaining vehicles are mostly delivered without rigging. One can order them as ready-made vehicles, however, the finishing still has to be done by the rigging manufacturer. There are electric and/or mechanical connections available, e.g., for the auxiliary drives necessary to cope with load capacity. Of all the possible types, e.g., cement mixers or garbage trucks, we have singled out the tipper-truck.

How it works

In the above figure1 the main frame and after that, the beginning of the front subframe. Actually a tipper-truck has three frames, its own backbone, above that a subframe, and also one for the very stable loading area. However, the truck chassis may not be, because of assembly of the subframe, too rigid. In figure1, the fixing bolt can be seen. Please note the distance between the two consoles and the screws, which are artificially extended through sleeves! They work like expansion bolts. For the lower console, screws were used instead of rivets. Additional holes may not be drilled into the vertical part of the chassis profiles between the axles. Actually, the front bottom of the subframe should also be rounded off because the subframe always distorts itself a little differently than the main frame, this can cause the loss of rust protection, and above all, a grooving effect is to be feared.
To accomodate the hydraulic unit, the tipper frame is higher in the middle (figure 2) because here it must absorb especially high forces due to the hydraulic ram. Figure 3 shows the completely rigid mounting which is only possible behind the last axle. Instead of screws or rivets there can also be interim solutions (figure 4). The hexagonal bolt head with the long shaft has no thread of its own and is not bolted onto the assembly, but pressed. It needs the hexagonal head only in the event of possible dismantling. However, once taken out, it cannot be used again.
Finally, let's have one more look at the actual tipping equipment. first of all, figure 4 shows the possibility of opening and closing the platform gate hydraulically. It becomes interesting if one looks more closely at the bolts (figure 5). There are two of them, and in principle there is the danger of putting them in diagonally. Then the loading bay does not know the whether it should tip to the rear or to the side. At the same time, the hydraulic ram can damage the three above mentioned frames. To prevent this, the two bolts with the numbers 1 and 2 can only fit properly into either the one, or into the other diagonal. 10/09


Imprint