User Manual
Table Of Contents
- Technical Systems Hydraulic System UNIWRAP
- Contents
- 1 Hydraulic circuit diagram
- 1.1 Hydraulic circuit diagram up to serial no.: 72600130
- 1.2 Hydraulic circuit diagram from machine no.: 72600131, with tipping cradle service shut-off valve (631)
- 1.3 Hydraulic circuit diagram from machine no.: 72600531, with film clamping cutters flow divider (769)
- 1.4 Hydraulic circuit diagram from serial no.: 72601047, with valve combination (630, 706, 769), without 3-stage restrictor (645)
- 1.5 Hydraulic circuit diagram from serial no.: 72601047, with valve combination (630, 706, 769), with 3-stage restrictor (645)
- 2 Pre-conditions for use
- 3 Valve block
- 4 Individual components
- 4.1 Input pressure balance (763)
- 4.2 Circulation shut-off valve (Y77-2)
- 4.3 Wrapping arm control unit (Y133)
- 4.4 Tipping cradle control unit (Y135 / Y136)
- 4.5 Wrapping table control unit (Y137 / Y138)
- 4.6 Clamping cutters control unit (Y139 / Y140)
- 4.7 Flow controller (630)
- 4.8 Pressure relief valve (706)
- 4.9 Wrapping arm motor (234)
- 4.10 Wrapping table motor (235)
- 4.11 Tipping cradle service shut-off valve (631)
- 4.12 Film clamping cutters hydraulic cylinder (374)
- 4.13 Film clamping cutters flow divider (769)
- 4.14 Wrapping arm motor valve block (4)
- 4.15 3-stage restrictor
- 4.16 Valve combination (7)
- 4.17 Manifold (8)
- 0293 522.0
TIC UNIWRAP Hydraulic System
11/04 UNI-h-Kap4 87
Open film cutters
while load on hydraulic
cylinders is not identical
When the load on the hydraulic cylinders is not identical, the control rams
(1, 4) are subject to different loads. In the case shown here, the higher
load pressure exists at port (P2).
Without any control function, the hydraulic cylinder subject to the smaller
load (port P3) would extend first since the volume flow always flows
where resistance is the lowest.
Due to the control function, the load pressure in port (P2) moves the
control ram (1) to the right. This enlarges the opening cross-section of
bore (2).
The control ram (4) follows this movement so that the opening cross-
section of bore (2) is reduced.
Due to the unequal opening cross-sections of bores (2, 3), the same
pressure drop is generated at each opening cross-section.
The total volume flow (port P1) is divided into two equal volume flows
(ports P2, P3). The hydraulic cylinders extend with the same speed
despite a different load.