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 89
Close 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 higher
load (port P2) would retract first.
Due to the control function, the load pressure in port (P2) moves the
control ram (1) to the right. This reduces the opening cross-section of
bore (2).
The load pressure moves the control ram (4) in the spring space to the
right, thus enlarging the opening cross-section of bore (2).
Due to the unequal opening cross-sections of bores (2, 3), the same
pressure drop is generated at each opening cross-section.
The two unequal partial volume flows are combined into one total volume
flow (port P1). The hydraulic cylinders retract with the same speed despite
a different load.