UNIWRAP Technical Systems Hydraulic System
TIC UNIWRAP Hydraulic System Contents 1 Hydraulic circuit diagram ................................................ 5 2 Pre-conditions for use ................................................... 27 3 Valve block ..................................................................... 31 4 Individual components ..................................................
Hydraulic System 4 UNIWRAP TIC UNI-h 11/04
TIC UNIWRAP Hydraulic System 1 Hydraulic circuit diagram 11/04 1.1 Hydraulic circuit diagram up to serial no.: 72600130 ........................8 1.2 Hydraulic circuit diagram from machine no.: 72600131, with tipping cradle service shut-off valve (631) ...............................12 1.3 Hydraulic circuit diagram from machine no.: 72600531, with film clamping cutters flow divider (769)....................................16 1.4 Hydraulic circuit diagram from serial no.
Hydraulic System 6 UNIWRAP TIC UNI-h-Kap1 11/04
1.1 Hydraulic circuit diagram - up to serial no.
Hydraulic System 1.1 UNIWRAP TIC Hydraulic circuit diagram up to serial no.: 72600130 Key to diagram: 8 UNI-h-Kap1 11/04 1 2 3 3a 4 5 6 Feed line Return line Valve block Plate Valve block Valve block Disc brake 234 235 Wrapping arm motor Wrapping table motor 374 375 376 Film clamping cutters hydraulic cylinder Tipping cradle hydraulic cylinder Wrapping table hydraulic cylinder 406 410 Orifice plate Ø 0.8 mm Orifice plate Ø 1.
TIC UNIWRAP Hydraulic System Description of function: Orifice plate (406) Ø 0.8 mm The orifice plate (406) Ø 0.8 mm avoids pressure build-up and consequently uncontrolled movements of the wrapping arm motor (234). Wrapping table flow control valve (630) The wrapping table flow control valve supplies the hydraulic motor (235) via output (A). This volume flow can be adjusted and changes the wrapping table motor / wrapping arm motor speed ratio and consequently the film layer overlaps.
Hydraulic System UNIWRAP TIC Description of function: Wrapping arm forward solenoid valve (Y133) The solenoid valve controls the wrapping arm hydraulic motor. A wrapping arm motor flow controller 767 is provided in the volume flow input and keeps the volume flow constant. When the control unit is activated, this volume flow is pumped to the hydraulic motor (234) which drives the wrapping arm with 28 ... 30 rpm max. The flow controller may be accessed via the screw plug at the bottom of the control unit.
1.2 Hydraulic circuit diagram - from machine no.
Hydraulic System 1.2 UNIWRAP TIC Hydraulic circuit diagram from machine no.: 72600131, with tipping cradle service shut-off valve (631) Key to diagram:: 12 UNI-h-Kap1 11/04 1 2 3 3a 4 5 6 Feed line Return line Valve block Plate Clamping cutters valve block Wrapping arm motor valve block Disc brake 234 235 Wrapping arm motor Wrapping table motor 374 375 376 Film clamping cutters hydraulic cylinder Tipping cradle hydraulic cylinder Wrapping table hydraulic cylinder 406 410 Orifice plate Ø 0.
TIC UNIWRAP Hydraulic System Description of function: Orifice plate (406) Ø 0.8 mm The orifice plate (406) Ø 0.8 mm avoids pressure build-up and consequently uncontrolled movements of the wrapping arm motor (234). Wrapping table flow control valve (630) The wrapping table flow control valve supplies the hydraulic motor (235) via output (A). This volume flow can be adjusted and changes the wrapping table motor / wrapping arm motor speed ratio and consequently the film layer overlaps.
Hydraulic System UNIWRAP TIC Description of function: Wrapping arm forward solenoid valve (Y133) The solenoid valve controls the wrapping arm hydraulic motor. A wrapping arm motor flow controller 767 is provided in the volume flow input and keeps the volume flow constant. When the control unit is activated, this volume flow is pumped to the hydraulic motor (234) which drives the wrapping arm with 28 ... 30 rpm max. The flow controller may be accessed via the screw plug at the bottom of the control unit.
1.3 Hydraulic circuit diagram - from machine no.
Hydraulic System 1.3 UNIWRAP TIC Hydraulic circuit diagram from machine no.: 72600531, with film clamping cutters flow divider (769) Key to diagram: 16 UNI-h-Kap1 11/04 1 2 3 3a 4 5 6 Feed line Return line Valve block Plate Clamping cutters valve block Wrapping arm motor valve block Disc brake 234 235 Wrapping arm motor Wrapping table motor 374 375 376 Film clamping cutters hydraulic cylinder Tipping cradle hydraulic cylinder Wrapping table hydraulic cylinder 406 410 Orifice plate Ø 0.
TIC UNIWRAP Hydraulic System Description of function: Orifice plate (406) Ø 0.8 mm The orifice plate (406) Ø 0.8 mm avoids pressure build-up and consequently uncontrolled movements of the wrapping arm motor (234). Wrapping table flow control valve (630) The wrapping table flow control valve supplies the hydraulic motor (235) via output (A). This volume flow can be adjusted and changes the wrapping table motor / wrapping arm motor speed ratio and consequently the film layer overlaps.
Hydraulic System UNIWRAP TIC Description of function: Wrapping arm forward solenoid valve (Y133) The solenoid valve controls the wrapping arm hydraulic motor. A wrapping arm motor flow controller 767 is provided in the volume flow input and keeps the volume flow constant. When the control unit is activated, this volume flow is pumped to the hydraulic motor (234) which drives the wrapping arm with 28 … 30 rpm max. The flow controller may be accessed via the screw plug at the bottom of the control unit.
1.4 Hydraulic circuit diagram - from serial no.
Hydraulic System 1.4 UNIWRAP TIC Hydraulic circuit diagram from serial no.
TIC UNIWRAP Hydraulic System Description of function: Orifice plate (406) Ø 0.8 mm The orifice plate (406) Ø 0.8 mm avoids pressure build-up and consequently uncontrolled movements of the wrapping arm motor (234). Wrapping table flow control valve (630) The wrapping table flow control valve supplies the hydraulic motor (235) via output (A). This volume flow can be adjusted and changes the wrapping table motor / wrapping arm motor speed ratio and consequently the film layer overlaps.
Hydraulic System UNIWRAP TIC Description of function: Wrapping arm forward solenoid valve (Y133) The solenoid valve controls the wrapping arm hydraulic motor. A wrapping arm motor flow controller (767) is provided in the volume flow input and keeps the volume flow constant. When the control unit is activated, this volume flow is pumped to the hydraulic motor (234) which drives the wrapping arm with 28 … 30 rpm max. The flow controller may be accessed via the screw plug at the bottom of the control unit.
1.5 Hydraulic circuit diagram - from serial no.
Hydraulic System 1.5 UNIWRAP TIC Hydraulic circuit diagram from serial no.
TIC UNIWRAP Hydraulic System Description of function: Orifice plate (406) Ø 0.8 mm The orifice plate (406) Ø 0.8 mm avoids pressure build-up and consequently uncontrolled movements of the wrapping arm motor (234). Wrapping table flow control valve (630) The wrapping table flow control valve supplies the hydraulic motor (235) via output (A). This volume flow can be adjusted and changes the wrapping table motor / wrapping arm motor speed ratio and consequently the film layer overlaps.
Hydraulic System UNIWRAP TIC Description of function: Wrapping arm forward solenoid valve (Y133) The solenoid valve controls the wrapping arm hydraulic motor. A wrapping arm motor flow controller (767) is provided in the volume flow input and keeps the volume flow constant. When the control unit is activated, this volume flow is pumped to the hydraulic motor (234) which drives the wrapping arm with 28 … 30 rpm max. The flow controller may be accessed via the screw plug at the bottom of the control unit.
TIC UNIWRAP Hydraulic System 2 Pre-conditions for use 11/04 2.1 Blocking the master valve (Y77) .....................................................28 2.2 Connection to tractor hydraulic system ...........................................
Hydraulic System UNIWRAP TIC 2.1 Blocking the master valve (Y77) From serial no. 1 Circulation shut-off valve solenoid coil (Y77-1) Caution: The screw must be turned in. The circulation shut-off valve is now permanently shut off. 2 Hand lever. Horizontally (to the outside) = Working position Vertically (to the bottom) = The tailgate is safeguarded in open position (for service work) P Feed line to UNIWRAP. T Return line from UNIWRAP. Up to machine no.
TIC UNIWRAP Hydraulic System 2.2 Connection to tractor hydraulic system Description of function: 1/2 The attachment can be connected to any tractor hydraulic system available on the market. Connection to tractors with constant-flow hydraulic system The quick release coupling 1 is connected to a control unit port of the tractor with adjustable oil flow. This control unit provides oil supply for the attachment and is adjusted to a constant volume flow of Qmax = 35 to 50 l/min.
Hydraulic System Description of function: Connection to tractors with load-sensing system and a Power Beyond port UNIWRAP TIC 2/2 The quick release coupling 1 is connected directly to the pump via the Power Beyond port P. The quick release coupling 2 is connected to port T (pressureless return line) of the tractor. Here the LS connection (LS, working hydraulics signal) is connected with the LS signal port of the tractor (the kit is available from the spare parts department).
TIC UNIWRAP Hydraulic System 3 Valve block 11/04 3.1 Valve block, up to machine no. 130 ................................................34 3.2 Valve block - from machine no. 131, with tipping cradle service shut-off valve (631) ...............................
Hydraulic System 32 UNIWRAP TIC UNI-h-Kap3 11/04
3.1 Valve block - up to machine no.
Hydraulic System 3.1 34 UNIWRAP TIC UNI-h-Kap3 11/04 Valve block, up to machine no.
TIC Key to diagram: 11/04 UNIWRAP F P T Screw plug Access to flow controller. Note: Screw plug F must not protrude.
Hydraulic System UNIWRAP TIC Description of function: Intermediate plate (3a) A connection from P to T is open in the intermediate plate. The LS connection is closed. Input pressure balance (763) The input pressure balance keeps the connection from P to T open when no control unit is actuated in valve block 3. It is closed by LS pressure. The LS pressure is built up when the master valve (Y77-2) or a control unit in valve block 3 is actuated.
3.2 Valve block - from machine no.
Hydraulic System 3.2 38 UNIWRAP TIC Valve block - from machine no.
TIC Key to diagram: 11/04 UNIWRAP F P T Screw plug Access to flow controller. Note: Screw plug F must not protrude.
Hydraulic System UNIWRAP TIC Description of function: Intermediate plate (3a) A connection from P to T is open in the intermediate plate. The LS connection is closed. Input pressure balance (763) The input pressure balance keeps the connection from P to T open when no control unit is actuated in valve block 3. It is closed by LS pressure. The LS pressure is built up when the master valve (Y77-2) or a control unit in valve block 3 is actuated.
TIC UNIWRAP Hydraulic System 4 Individual components 4.1 Input pressure balance (763) ..........................................................42 4.2 Circulation shut-off valve (Y77-2)....................................................46 4.3 Wrapping arm control unit (Y133) ...................................................50 4.4 Tipping cradle control unit (Y135 / Y136)........................................54 4.4.1 Up to serial no.: with lock-up valve unit ...............................
Hydraulic System 4.
TIC Key to diagram: 11/04 UNIWRAP Hydraulic System P Channel pump Volume flow input from the baler. Channel P continues through each downstream control unit and is connected with the spool in each case. P1 Port. Supply of film cutter control unit LS The LS channel is connected to each of the downstream control units. Here the load pressure is applied when a control unit is actuated. T Return line (tank).
Hydraulic System 44 UNIWRAP TIC UNI-h-Kap4 11/04
TIC UNIWRAP Hydraulic System Description of function: No volume flow flowing The pressure spring pushes the control piston (1) to the left-hand stop. The connection from P to T is closed. Volume flow flowing – but no control unit is actuated The compression spring pushes the control ram (1) to its left-hand stop. The connection from P to T is closed. Volume flow enters the pressure balance via channel P (from the tractor via the baler) and flows to each of the downstream control units.
Hydraulic System 4.
TIC Key to diagram: UNIWRAP Hydraulic System P Channel pump Volume flow input from the baler. Channel P continues through each downstream control unit and is connected with the spool in each case. T Return line (tank). The channel T continues through each of the downstream control units and is connected with the spool in each case. A Port. The connection is closed. B Port. The connection is closed. LS The LS channel is connected to each of the downstream control units.
Hydraulic System UNIWRAP TIC Description of function: The circulation shut-off valve solenoid coil (Y77-2) is actuated whenever a hydraulic function is to be carried out on the baler (e.g. open tailgate, raise pick-up ...). No volume flow flowing Due to the two pressure springs located at the face end, spool (2) is positioned so that (see figure): - channel P is shut off at the spool - ports A and B are connected with the tank - bore (2) is connected with the tank.
TIC UNIWRAP 11/04 UNI-h-Kap4 Hydraulic System 49
Hydraulic System 4.
TIC Key to diagram: UNIWRAP Hydraulic System P Channel pump Volume flow input from the baler. Channel P continues through each downstream control unit and is connected with the spool in each case. T Return line (tank) The channel T continues through each of the downstream control units and is connected with the spool in each case. LS The LS channel is connected to each of the downstream control units. When the wrapping arm rotates, the load pressure acts here.
Hydraulic System UNIWRAP TIC Description of function: No volume flow flowing Due to the two pressure springs located at the face end, spool (2) is positioned so (see figure) that ports P and A are shut off. Oil supply is available, but control unit is not yet actuated The volume flow enters the control unit via channel P and flows through orifice plate (3a) to spool (1).
TIC UNIWRAP Hydraulic System Control behaviour When volume flow flows through the 2-way flow controller (767), different pressure levels are generated: - The pump pressure is applied ahead of the orifice plate (3a) - The load pressure is applied behind the orifice plate (3a) via connection (3b). The pressure behind the orifice plate (3a) is lower than the pressure ahead of the orifice plate. This pressure difference is referred to as ∆p.
Hydraulic System 4.4 4.4.1 54 UNIWRAP TIC Tipping cradle control unit (Y135 / Y136) Up to serial no.
TIC Key to diagram: UNIWRAP Hydraulic System P Channel pump Volume flow input. T Return line (tank) LS LS channel. When the tipping cradle is actuated, the load pressure acts here. This pressure signal ends in the input pressure balance. A Port To the rod spaces of the hydraulic cylinders. The tipping cradle is raised when pressure is built up. B Port To the piston spaces of the hydraulic cylinders. The tipping cradle is lowered when pressure is built up.
Hydraulic System UNIWRAP TIC Description of function: No volume flow flowing, the solenoid valves are not actuated. Due to the two pressure springs located at the face end, spool (1) is positioned so (see figure) that port P is shut off. Ports A and B are sealed by the non-return valves. Raise tipping cradle Solenoid coil (Y136) is actuated by the UNIWRAP electronics module and moves spool (1) to the left.
TIC UNIWRAP Hydraulic System Notes: 11/04 UNI-h-Kap4 57
Hydraulic System 4.4 4.4.2 58 UNIWRAP TIC Tipping cradle control unit (Y135 / Y136) From serial no.
TIC Key to diagram: UNIWRAP Hydraulic System P Channel pump Volume flow input. T, T1 Return line (tank) LS LS channel When the tipping cradle is actuated, the load pressure acts here. This pressure signal ends in the input pressure balance. A Port To the rod spaces of the hydraulic cylinders. The tipping cradle is raised when pressure is built up. B Port To the piston spaces of the hydraulic cylinders. The tipping cradle is lowered when pressure is built up.
Hydraulic System UNIWRAP TIC Description of function: No volume flow flowing, the solenoid valves are not actuated. Due to the two pressure springs located at the face end, spool (1) is positioned so (see figure) that port P is shut off. Raise tipping cradle Solenoid coil (Y136) is actuated by the UNIWRAP electronics module and moves spool (1) to the left.
TIC UNIWRAP Hydraulic System Notes: 11/04 UNI-h-Kap4 61
Hydraulic System 4.
TIC Key to diagram: UNIWRAP Hydraulic System P Channel pump Volume flow input. T, T1 Return line (tank) LS LS channel When the wrapping table is raised, the load pressure acts here. This pressure signal ends in the input pressure balance. A Port Is closed. B Port To the rod spaces of the hydraulic cylinders. The wrapping table is raised when pressure is built up. 1 Spool Actuated by solenoid valve (6). 734-1 Lock-up valve unit non-return valve This seals off port A and is opened by ram (4).
Hydraulic System UNIWRAP TIC Description of function: No volume flow flowing, the solenoid valves are not actuated. Due to the two pressure springs located at the face end, spool (1) is positioned so (see figure) that port P is shut off. Port B is sealed by non-return valve (2). Raise wrapping table Solenoid coil (Y138) is actuated by the UNIWRAP electronics module and moves spool (1) to the right.
TIC UNIWRAP Hydraulic System Notes: 11/04 UNI-h-Kap4 65
Hydraulic System 4.6.
TIC Key to diagram: UNIWRAP Hydraulic System P Channel pump Volume flow input. T Return line (tank) A Port to the rod space of the right hydraulic cylinder. B Port to the ram space of the left hydraulic cylinder. 1 Ball It is opened by the magnetic tappet (2). When not energized, it closes port P. 2 Magnetic tappet It is pushed down by the solenoid valve (Y139, Y140) and opens ball (1).
Hydraulic System UNIWRAP TIC Description of function: When de-energised, the balls (1) keep the pressure port P closed. The load ports A and B are connected with tank T. When a solenoid valve (Y139, Y140) is energized, the magnetic tappet opens the ball (1) against the spring and the applied hydraulic pressure. The connection from P to A or to B is released. At the same time, the ram cone closes the feed line to the tank. In this condition, a consumer connected to port “A” or “B” can perform work.
TIC UNIWRAP Hydraulic System Notes: 11/04 UNI-h-Kap4 69
Hydraulic System 4.7 70 UNIWRAP TIC UNI-h-Kap4 11/04 Flow controller (630) Up to serial no.
TIC Key to diagram: 11/04 UNIWRAP Hydraulic System P Input for total volume flow = Return oil from wrapping arm hydraulic motor (approx. 17 l/min) A Port Constant flow output to wrapping table hydraulic motor. B Port Residual flow output to tank. E Adjusting screw Adjusts the pre-stress of the pressure spring 1 Orifice plate In the control piston (3), produces the pressure difference ∆p which determines the constant flow at port A.
Hydraulic System UNIWRAP TIC Description of function: The total volume flow enters the flow controller via port P and flows through the orifice plate (1). Here the pressure difference ∆p appears. The pressure downstream of the orifice plate (1) is lower than the pressure upstream of it. The flow controller keeps this ∆p constant, even when the pressure in port A changes.
TIC UNIWRAP 11/04 UNI-h-Kap4 Hydraulic System 73
Hydraulic System 4.
TIC Key to diagram: UNIWRAP 630 Flow controller 706 Pressure relief valve Hydraulic System Description of function: The pressure relief valve limits the pressure when lowering the tipping cradle to 70 bar. It is installed below the valve block.
Hydraulic System 4.
TIC Key to diagram: UNIWRAP W 234 B P T Y134 V L Hydraulic System Wrapping arm drive shaft Wrapping arm hydraulic motor Brake Feed line Return line Wrapping arm backward solenoid coil Valve block Leakage oil line Description of function: When the wrapping arm rotates, the brake is opened by compressed oil. When the wrapping arm is at standstill, the brake is mechanically closed, preventing wrapping arm rotation by hand.
Hydraulic System 4.
TIC Key to diagram: 11/04 UNIWRAP 235 Hydraulic System Wrapping table motor UNI-h-Kap4 79
Hydraulic System 4.
TIC Key to diagram: UNIWRAP 631 Hydraulic System Tipping cradle service shut-off valve Description of function: The Tipping cradle service shut-off valve 631 is mounted directly on the control unit port. For service work, the raised tipping cradle can be secured with the shutoff valve.
Hydraulic System 4.
TIC Key to diagram: UNIWRAP 374 628 Film clamping cutters hydraulic cylinder Non-return valve A B K R Ram space port Rod space port Ram Ring Hydraulic System Description of function: The hydraulic cylinders are connected in series. The film cutter cylinders extend when hydraulic pressure is applied at port A. The film cutter cylinders retract when hydraulic pressure is applied at port B.
Hydraulic System 4.
TIC UNIWRAP Hydraulic System Description of function: Task The flow divider divides the supplied volume flow (port P1) into 2 equal volume flows (ports P2 and P3). The hydraulic cylinders of the film cutters are connected here. These volume flows remain constant even when the loads from consumers at ports (P2 and P3) change. At equal volume flows, the speeds of the hydraulic cylinders are also constant.
Hydraulic System UNIWRAP TIC Function Open film cutters while load on hydraulic cylinders is identical When the load on the hydraulic cylinders is identical, the control rams (1, 4) are subject to equal loads. The compression springs position the two control rams so that the opening cross-sections of the bores (2, 3) are identical. The total volume flow enters the flow divider via port (P1).
TIC UNIWRAP Hydraulic System 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.
Hydraulic System UNIWRAP TIC Close film cutters while load on hydraulic cylinders is identical When the load on the hydraulic cylinders is identical, the control rams (1, 4) are subject to equal loads. The compression springs position the two control rams so that the opening cross-sections of the bores (2, 3) are identical. The equal partial volume flows (ports P2, P3) are combined into one total volume flow (port P1). The film cutters close with the same speed.
TIC UNIWRAP Hydraulic System 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.
Hydraulic System 4.
TIC Key to diagram: UNIWRAP Hydraulic System 764 765 766 Wrapping arm motor drive pressure relief valve 115+10 bar Wrapping arm motor brake pressure relief valve 115+10 bar Brake valve F Direction of travel Description of function: Pressure relief valve (764) The wrapping arm motor drive pressure relief valve (764) limits the oil pressure to the wrapping arm motor (234) and the wrapping table motor (drive) connected in series to 115+10 bar.
Hydraulic System 4.
TIC Key to diagram: UNIWRAP 645 3-stage restrictor I II III Valve position, restrictor Ø 1.5 mm Valve position, restrictor Ø 0.8 mm Valve position, restrictor Ø 1.5 mm Hydraulic System Description of function: To enable raising and lowering the wrapping table at different speeds, the respective speed may be preselected using the 3-stage restrictor. Valve position I In valve position I (operation without bale rotating mechanism), the wrapping table is lowered and raised via a 1.5 mm orifice plate.
Hydraulic System 4.
TIC Key to diagram: UNIWRAP 630 Wrapping table flow control valve 706 Pressure relief valve 769 Film clamping cutters flow divider Hydraulic System Description of function: The valve combination (7) combines the components (630, 706 and 769). Wrapping table flow control valve (630) The wrapping table flow control valve supplies the hydraulic motor (235). This volume flow can be adjusted to up to 8 l/min.
Hydraulic System 4.
TIC Key to diagram: UNIWRAP 8 Hydraulic System Manifold Description of function: The introduction of the manifold (8) simplifies the laying of lines on the UNIWRAP.
Hydraulic System 98 UNIWRAP TIC UNI-h-Kap4 11/04
Following the policy of CLAAS KGaA mbH to improve their products as technical developments continue, CLAAS reserve the right to make alterations which must not necessarily correspond to text and illustrations contained in this publication, and without Incurring obligation to alter any machines previously delivered. Technical data, dimensions and weights are given as an indication only. Responsibility for errors or omissions not accepted.
CLAAS KGaA mbH Postfach 1163 33426 Harsewinkel Tel. +49 (0)5247 12-0 www.claas.com 0293 522.0 SYS-HY UNIWRAP EN - 05.
