URBAN HM70 with Big-Bag bagging

The connection to hydraulic power unit

The machine is attached to the hydraulic power unit and its hydraulic circuit. Required parameters of the hydraulic circuit of the power means are: oil flow rate min. 40 l/min (optimally 50 l / min or more) and oil pressure min. 18 MPa.

The machine is controlled by the hydraulic distributor lever and the flow regulator, which adjusts the speed of the chipping device.

The connecting frame

The connecting frame must be mounted on the device. It is supplied as an accessory. The connection frame is used to connect the device to the hydraulic power. We supply different types of connecting frames for different hydraulic power unit (EURO NORM, UNC 60, 3-point hitch, …). The 2 front sliding legs are part of the connecting frame, which serves to ensure the optimum working height during chipping (the other 2 rear sliding legs are part of the branch logger frame).

The inlet hopper

The inlet hopper consists of a fixed and a folding part. The folding part of the inlet hopper gives a narrower profile in the transport position. Once locked in the working position the hopper ensures optimised branch intake and operational safety. Additionally, the hopper is fitted with a safety cut-out frame, which by pressing down stops the chipping device. The inlet hopper is oriented horizontally, which greatly facilitates insertion of long branches compared to the vertical or sloping hopper. Surface treatment of the whole machine is made with powder paint.

The Big-Bag bagging device

It is used aerated large-size bags of 90 x 90 x 100 cm. The Big-Bag using is faster because bags do not have to be changed so often compared to smaller raschle bags. The Big-Bag (also full) could be lifted by power unit's hydraulics during moving in forest. The adjustable arms of bagging device are retractable.

The overload protection

The logger is equipped by its own pressure valve. When a too strong branch is inserted, the logger system stops. If this happens, the control lever is switched to STOP position and then briefly to the REVERSE position to release the branch from the  logger. It is possible to continue working immediately after switching the lever to the START position.

The chipping device

The working principle of branch loggers URBAN lies in two counter rotating shafts with knives. The rotating knives draw in the wood material into the feed hopper unassisted. The passage gap between the shafts is 70 mm. Each shaft has 3 fixed knives, made from high quality tool steel. It is possible to resharpen the knives repeatedly. After sharpening there is a pad to be put under the knives in order to keep the same gap between the knives (c. 0,1 mm). One single sharpening of knives is capable of producing from 100 to 500 solid meters of small logs, depending the level of contaminants (mud, nails, stones etc.). Each blade can be sharpened up about 4 mm, then it must be replaced with a new one.