WO2003080496A1

WO2003080496A1 - Control

Info

Publication number: WO2003080496A1
Application number: PCT/DE2003/000312
Authority: WO
Inventors: Heinz Habermann
Original assignee: Bosch Rexroth Ag
Priority date: 2002-03-22
Filing date: 2003-02-04
Publication date: 2003-10-02
Also published as: EP1487732B1; DE50304364D1; NO20043574L; KR20050002883A; DE10213010A1; EP1487732A1; JP2005520998A

Abstract

The invention relates to a control for hydraulically actuated consumers, especially a winch, whereby a hydraulic drive of the consumer is linked with a pump or a reservoir by means of a continuously adjustable main valve (18). The control is provided with a hydraulically actuated brake device (8) for immobilizing the consumer. The main valve can be actuated by means of a manually actuated pre-control (64) or a remote control. According to the invention, the brake device is released via a brake lift valve that impinges, either when pre-controlled or when manually pre-controlled, the brake device with the same brake lift pressure that is preferably tapped upstream of the main valve.

Description

description

control

The invention relates to a control for a hydraulically operated consumer, in particular a winch according to the preamble of patent claim 1.

Such a control is used in particular in the control of winches for hoisting and securing hawser of a ship. WO 00/57067 AI discloses a winch control in which a winch for hoisting / securing the hawser is driven by a hydraulic motor. This in turn is driven by a variable displacement pump, the pressure medium flow from the variable displacement pump to the hydraulic motor and from the hydraulic motor to a return line (tank) being controlled via a proportionally adjustable main valve. This main valve is designed with a manual pilot control, via which the operating states "heave", "freeze" and - optionally - "mooring" can be set.

The known winch control also has a connection for remote control via which the main valve can be controlled even when the pilot control is not actuated. In the neutral division of the main valve, i.e. when the winch is not actuated, its rotational position is fixed via a hydraulically operated braking device. This has a hydraulic cylinder spring-loaded in the direction of the brake engagement. The brake is ventilated by pressurizing a pressure chamber of the hydraulic cylinder that acts against the spring.

In this known construction it can be when lifting an empty rope (load pressure towards zero) and sudden

Actuation of the main valve via the remote control occurs men that the pressure applied to the hydraulic cylinder for venting the brake oscillates between a maximum value and zero. Such a vibration behavior of the brake ventilation pressure is shown in FIG. 1, to which reference is already made. Surprisingly, this oscillation of the brake ventilation pressure only occurs when activated via the remote control - such vibrations could not be observed when the main valve was activated via the manually operated pilot control.

In contrast, the invention has for its object to provide a control for a hydraulically operated consumer, in particular for a winch, in which the release of a brake device associated with the winch can be carried out substantially without vibration even at low load pressure.

This object is achieved by a control with the features of patent claim 1.

According to the invention, the control is provided with a brake ventilation valve, via which a brake control space of the brake device which is effective in the direction of brake ventilation can be acted upon with a brake ventilation control pressure tapped upstream of the main valve both when the main valve is actuated via the remote control and via the pilot control device.

According to the invention, the braking device is thus activated independently of the operating mode (remote control / manual operation) via the same brake ventilation pressure, which is independent of the pressure drop at the main valve or of the coordination of the control edges of the pilot control and the main valve. In contrast to this solution according to the invention, the brake release pressure was tapped in the known solution in the case of activation via a remote control downstream of the main valve - it was surprisingly found that the vibrations no longer occur when the brake pressure is tapped upstream of the main valve.

According to the invention, it is preferred if the brake control pressure required to actuate the brake ventilation valve corresponds to the control pressure for actuating the main valve. That the control pressure applied via the remote control or the pilot control is then also used to switch over the brake ventilation valve.

This brake ventilation valve is preferably designed as a 3/2-way valve which, in a spring-loaded basic position, relieves the control chamber of the braking device which is effective in the direction of brake ventilation and which can be switched by the aforementioned brake control pressure into a position in which the brake control chamber is acted upon by the brake ventilation pressure.

In a particularly preferred exemplary embodiment, this brake ventilation pressure essentially corresponds to the pump pressure applied via the variable pump.

The control of the individual elements of the winch control is particularly simple if a control pressure for controlling the drive, which is designed as a hydraulic motor with variable absorption capacity, also corresponds to the control pressure for actuating the brake ventilation valve and the main valve.

In an advantageous variant of the invention, the pilot control has a directional control valve known per se at least two output connections, each of which is connected to a control chamber of the main valve via control lines. The higher control pressure present at the output connections or switched on via the remote control is tapped via a shuttle valve arrangement as a brake control pressure and / or as a control pressure for controlling the hydraulic motor.

The limit pressure at which the brake release valve is switched to ventilate the brake device can be adjusted to different operating conditions via an adjustable control spring of the brake release valve.

The directional control valve of the pilot control can preferably be adjusted to a fieren / heave and mooring switch position, so that all three operating states can be set in manual mode, while only the operating states "heave" and "fieren" can be set by remote control.

Other advantageous developments of the invention are the subject of the further subclaims.

A preferred exemplary embodiment of the invention is explained in more detail below with the aid of schematic drawings. Show it:

1 shows a brake pressure as a function of time when lifting an empty rope with a conventional winch control;

Figure 2 is a circuit diagram of a winch control according to the invention with brake ventilation valve and

Figure 3 shows the brake pressure as a function of time in a winch control according to the invention. FIG. 2 shows the circuit diagram of a winch control, by means of which a winch can be controlled for hoisting or securing a hawser. The basic concept of the winch control shown in FIG. 2 corresponds to the winch control described in WO 00/57067 AI, so that only the components essential for understanding are described below and reference is made to the disclosure of the aforementioned publication.

The winch 2 is driven by a hydraulic motor 4 with variable absorption volume, which is connected to the winch 2 via a gear 6. This can be determined via a braking device 8 in a predetermined rotational position for holding the hawser. According to the invention, this braking device 8 has a hydraulic cylinder 10, which is biased by a spring in the direction of the brake engagement and can be pressurized by pressurizing an annular space 12 in the direction of the brake ventilation.

The connections 14, 16 of the hydraulic motor 4 are connected to a pressure line 19 carrying the pressure of a variable displacement pump (not shown) or a return or tank line 21 via a pilot-operated main valve 18, the valve slide of which is moved from its spring-loaded basic position to the right (FIG 2) is continuously adjustable in the direction of "heaving" and to the left in the direction of "fieren" This main valve 18 has two tank connections 20, 22, a pressure connection 24, a working connection 26 connected to the connection 14 of the hydraulic motor, a working connection 28 connected to the connection 16 of the hydraulic motor and a control connection 30. The tank connection 22 is connected to the tank line 21 via a drain valve 32. This drain valve 32 is acted upon in the closing direction by the force of a spring and a control pressure present in a control line 34 and in the opening direction by the pressure present at the connection 14 of the hydraulic motor.

In a supply line 36 connecting the pressure connection 24 to the pressure line 19, a pressure compensator 38 is provided which is acted upon in the closing direction by a pressure upstream of a metering orifice formed by the main valve 18 and in the opening direction by the pressure at the control connection 30 - this pressure corresponds to the pressure downstream of the metering diaphragm.

The two control rooms of the main valve 18 are connected via control channels 40, 42 to output ports of shuttle valves 44, 46, these output ports being connected via a third shuttle valve 48 and a motor control line 50 to a control port 52 of the hydraulic motor 4. A motor control valve 54 of the hydraulic motor 4 can be controlled to change the swallowing volume via the control pressure present in the motor control line 50.

The input connections of the two shuttle valves 44, 48 are connected to two remote control connections 56 and 58 and to two pilot control connections 60, 62 of a way valve 64. This can be shifted from its spring-loaded basic position by means of an adjusting lever 66 into the switching positions "Fieren", "Hieven" and "Mooring".

The directional control valve 64 also has an input connection 70 and an output connection 72. The input connection 70 is via a pressure reducing valve 74 and one Pressure channel 76 connected to the inlet line 36. A quantity regulator 78, a non-return valve 80 opening in the direction of the pressure reducing valve 74 and a further pressure reducing valve 82 are provided in the pressure channel 76. The latter is acted upon in the opening direction by the pressure at the outlet of the pressure reducing valve 74 and in the closing direction by the force of a spring. The pressure reducing valve 74 is adjusted via a control curve 84 of the actuating lever 66, an output connection of the pressure reducing valve 74 being connected to a leakage line 88 via a leakage channel 86 in a neutral position.

In the area between the volume regulator 78 and the further pressure reducing valve 82, a brake pressure channel 90 branches off, which is led to a connection 92 of a brake release valve 94. This is designed as a 3/2-way valve which shuts off the connection 92 in its spring-preloaded basic position and connects a brake ventilation line 96 connected to the annular space 12 via a relief line 98 to the leakage line 88 or the tank line 21. The control chamber, which acts in the opposite direction to the spring of the brake ventilation valve 94, is acted upon via a channel 100 by the pressure in the engine control line 50, via which the engine control valve 54 is also controlled, and the larger one of the two shuttle valves 44 and 48 corresponding pressures.

As indicated in FIG. 2, the directional control valve 64 can also be designed without the "Mooring" switch position.

In your variant of this type, the quantity regulator 78 and the check valve 80 would then also be eliminated.

In a further variant of the winch control, an internal leakage channel 86 'could also be used instead of the external leakage channel 86. To heave the hawser, the adjusting lever 66 is pivoted to the right into the hatched heave region and, accordingly, the piston of the directional valve 64 is shifted to the right. At the same time, the pressure reducing valve 74 is actuated via the control curve 84, so that the input connection 70 is connected via the further pressure reducing valve 82 to the pressure channel 76 and thus to the pressure line 19 carrying the pump pressure. In the heave position, the pressurized input connection 70 is connected to the pilot control connection 62, while the other pilot control connection 60 is connected to the output connection 72 and thus to the leakage channel 86. The control pressure corresponding to the pressure at the inlet port 70 is tapped via the shuttle valve 46 and the control channel 42 and is applied to the control chamber of the main valve 18 on the right in FIG and opened the metering orifice accordingly. In the heave

Position, the pressure connection 24 is connected to the working connection 28 and the working connection 26 to the tank connection 20, so that the connection 16 of the hydraulic motor 4 acts as an inlet connection and the connection 14 as an outlet connection. The control pressure present at the pilot control connection 62 is also reported to the engine control line 50 via the two shuttle valves 46 and 48, so that the absorption volume of the hydraulic motor 4 is adjusted according to the control pressure via the engine control valve 54. The pressure present in the engine control line 50 is above the

Channel 100 also on the control room of the brake release valve 94. By means of this control pressure, the brake ventilation valve 54 is shifted from its illustrated basic position into its switching position in which the connection 92 is connected to the brake ventilation line 96. Correspondingly, there is a pump pressure in the annular space 12 of the hydro droplet 10 Corresponding brake ventilation pressure on - the braking device 8 is disengaged and the winch 2 is controlled in accordance with the direction of rotation of the hydraulic motor 4 to raise the hawser.

When using a remote control, the adjusting lever 66 remains in its basic position shown. A control pressure difference is applied to the two remote control connections 56, 58 via the control unit of the remote control, the higher control pressure being tapped via the shuttle valves 44, 46 and 48 for controlling the main valve 18, the engine control valve 54 and the brake release valve 94. To raise the hawser by means of the remote control, a higher control pressure is then applied to the remote control connection 58, which is reported via the shuttle valve 46 and a control channel 52 into the right control chamber of the main valve 18 - the valve spool of the main valve 18 is turned to the left in the manner described above a Hieven position shifted and the hydraulic motor controlled accordingly. The pressure at the outlet of the shuttle valve 46 is reported via the further shuttle valve 48 to the engine control line 50, so that the engine control valve 54 is controlled accordingly to change the swallowing volume; Furthermore, as with the manual control, the brake ventilation valve 94 is brought into its switching position, so that the brake ventilation line 96 via the brake ventilation valve 54, the brake pressure channel 90, the volume regulator 78, the check valve 80 and the feed line 36 for releasing the brake with the Pressure line 19 is connected.

The "Fieren" and "Mooring" operating states are activated accordingly.

Through the use of the brake release valve 94, via which both when using a remote control and Even with manual operation, the same brake ventilation pressure is always applied. Surprisingly, the fluctuations described above when lifting an empty rope can be excluded or at least reduced to an acceptable level.

FIG. 3 shows the brake ventilation pressure which arises when a remote control is used when an empty rope is hauled in by means of the winch 2. When the control pressure described above is applied by means of the remote control, the brake ventilation pressure rises to its desired maximum value (for example pump pressure) in a very short time, with a constant brake ventilation pressure being present after a very short settling. This characteristic curve of the brake ventilation pressure practically does not differ from that when the main valve 18 is actuated via the actuating lever 66.

The response of the winch 2 can be improved by the solution according to the invention even at low load pressures and very rapid, sudden application of the control pressure by means of a remote control.

In the embodiment shown in Figure 2, the brake ventilation valve 94 is biased by a control spring in the position in which the annular space 12 is connected to the leakage line 88 or the tank line 21. The switching point of the brake release valve 94 can be changed if this control spring is designed with a device for changing the preload.

A control for a hydraulically operated consumer is disclosed, in particular a winch, in which a hydraulic drive of the consumer can be connected to a pump or a tank by means of a continuously adjustable main valve. The control system has a hydraulically operated braking device. The main valve can be controlled by means of a manual pilot control or a remote control. According to the invention, the brake device is released via a brake ventilation valve, which applies the same brake release pressure to the brake device both when using a pilot control and when actuating via the manually operated pilot control, which pressure is preferably tapped upstream of the main valve.

REFERENCE LIST;

Winch hydraulic motor gearbox brake device hydraulic cylinder annulus connection connection main valve pressure line tank connection tank line tank connection pressure connection work connection work connection control connection drain valve control line inlet line pressure balance control channel control channel changeover valve changeover valve third changeover valve motor control line control connection motor control valve remote control connection remote control connection pilot control connection pilot control connection Directional control valve, control lever, inlet connection, outlet connection, pressure reducing valve, pressure channel, flow regulator, non-return valve, further pressure reducing valve, control curve, leakage channel, leakage line, brake pressure channel, connection, brake ventilation valve, brake ventilation line, relief line, channel

Claims

claims

1. Control for a hydraulically controlled consumer, in particular a winch, with a pump for supplying a drive (4) of the consumer (2) with pressure medium, a main valve (18) for controlling the pressure medium flow to or from the drive (4) and a hydraulically actuated braking device (8) for the consumer (2), the main valve (18) being assigned a pilot control (64) which can be adjusted by means of a handle (66), via which control spaces of the main valve (18) can be acted upon by a control pressure , and with a remote control via which the main valve (18) alternatively to

Pilot control (64) can be controlled, characterized by a brake ventilation valve (94), via which an in

Effective brake control room in the direction of brake ventilation

(12) of the brake device (8), when the main valve (18) is activated via the remote control and also via the pilot control (64), can be acted upon with a brake ventilation pressure, preferably tapped upstream of the main valve (18).

2. Control according to claim 1, wherein the brake ventilation valve (94) for brake ventilation can be actuated by means of a brake control pressure which corresponds to the control pressure for actuating the main valve (18).

3. Control according to claim 2, wherein the brake ventilation valve is a 3/2-way valve (94) which relieves the brake control chamber (12) in a spring-loaded basic position and which can be switched to a position by the brake control pressure in which the brake control space ( 12) is subjected to the brake ventilation pressure.

Control according to one of the preceding claims, wherein the brake ventilation pressure corresponds approximately to the pump pressure.

Control according to one of the preceding claims, wherein the brake control pressure corresponds to the control pressure for controlling the drive designed as a hydraulic motor (4) with variable absorption capacity.

6. Control according to one of the preceding claims, wherein the pilot control has a directional control valve (64) with at least two pilot control connections (60, 62), which are connected via control channels (40, 42) to a control chamber of the main valve (18), the higher control pressure present at the pilot control connections (60, 62) or applied via the remote control being able to be tapped off as a brake control pressure via a shuttle valve arrangement (44, 46, 48).

7. Control according to one of the preceding claims, wherein a control spring of the brake release valve is designed to be adjustable.

8. Control according to claim 6, wherein the directional valve (64) via an adjusting lever (66) is adjustable in a Fieren, Hieven and optionally a mooring switch position.