EP3010845B1 - Load-compensating rope sheave arrangement - Google Patents

Description

The present invention relates to a compensating cable pulley arrangement for drum conveyors with at least two sheaves guided vertically in slide frames and mounted on hydraulically short closed cylinders and a corresponding method as described by the preambles of the independent claims.

In mining drum machines are used, the two coils rectified coil (so-called Blairanordnung), which are posted on a conveyor. During a conveying cycle, the two conveyor cables stretch differently due to their mechanical properties. To compensate for this differential elongation of the hoisting ropes, it is a well-known practice to provide compensating pulleys, which at the same time ensure that both hoisting ropes are constantly loaded equally

In addition, when the ropes are being drummed onto the respective drums of the drum carrier, so-called faulty winding may occur in which one of the conveyor ropes is not wound up in the correct rope layer.

So that now both ropes are charged equally, the pulleys are vertically mounted on cylinders and these hydraulically short closed, so that an oil balance can be made and the sheaves can adjust vertically so that both ropes carry the same load.

However, the known systems now lack the ability to detect incorrect behavior on the one hand of the compensating cable pulley device or to detect faulty reeling via the loads on the compensating pulley, and to initiate necessary safety measures.

The US3014699 discloses an arrangement and a method according to the preambles of claims 1 and 7.

The object of the present invention is therefore to provide a compensating cable pulley device and a corresponding method for operating the same, which offers the possibility of detecting and correcting incorrect behavior in the overall system monitor. The system should provide monitoring functions, contain safety measures and be able to intervene in the machine control of the drum carrier, which is provided with the Kompensationsseilscheibenvorrichtung. In addition, the hydraulic system of the compensating sheave device should be mechanically monitored to indicate a malfunction or failure and to take safety measures.

This object is solved by the features of the independent claims, wherein expedient embodiments are described by the features of the subclaims.

Provided is a Kompensationsseilscheibenanordnung for drum conveyors with at least two vertically guided in sliding frame and mounted on hydraulically short cylinders sheaves, which is characterized in accordance with the present invention, characterized in that a multi-redundant monitoring of the different acting on the sheaves rope loads on the hydraulic cylinder is provided , which is communicatively connected to the plant control of the drum carrier.

Preferably, the Kompensationsseilscheibenanordnung is characterized by the fact that the multi-redundant monitoring of the different acting on the pulleys rope loads on the hydraulic cylinder at least from at least one linear transducer, at least one Wegendschalter and a cylinder pressure monitoring.

Furthermore, it is preferred that in each case a mechanical stop is provided above the respective lower cylinder end point, for safe lowering of the slide frame in the event of an overload in the hydraulic system and avoidance of mechanical damage to the respective cylinder.

In a further preferred embodiment, the compensation cable pulley arrangement may be characterized in that the hydraulically short closed Cylinders are arranged on a mechanical load balance rocker with mechanical stop on both sides to accommodate the loads of the sheaves, which is at the same loads on the sheaves in balance. The load balance rocker can be provided on both sides each with spring packs that allow a tolerance value for the rockers. Finally, on both sides of the rocker also ever a linear transducer for measuring the rocker be mounted whose path difference is constantly monitored by the plant control of the drum carrier.

Furthermore, in accordance with the invention, a method for operating a Kompensationsseilscheibenanordnung for drum conveyors with at least two vertically guided in sliding frame and mounted on hydraulically short cylinders sheaves provided by the provision of a multi-redundant and communicatively connected to the plant control of the drum carrier monitoring the different on the pulleys acting rope loads on the hydraulic cylinder excels.

This method can be designed such that the multi-redundant monitoring continuous monitoring of the position of the cylinder by a position measuring system, monitoring the position of the cylinder by providing limit switches at the transition points of the working areas and a continuous monitoring of the pressure in the cylinders and discharging the oil into a tank when a defined value is exceeded and lowering the slide frame to mechanical stops above the lower cylinder end points.

Furthermore, to monitor the malfunction of the hydraulically operating system, a mechanical load balance rocker be provided with bilateral, mechanical stop for receiving the loads of the sheaves, which is at the same loads on the sheaves in balance.

To avoid the display of very low load differences and to counteract a constant tilting of the load balance rocker spring assemblies can be provided between cylinders and load balance rocker beyond the one Allowing a tolerance value for the rockers, wherein, if this tolerance value is exceeded, the rocker rests on one side and damage to the system is prevented by a corresponding signal to the plant control.

Furthermore, a linear transducer can be provided on both sides of the load balance rocker, the path difference of which is constantly monitored by the plant control and, if the difference is too large and leaves the range of tolerance, found the malfunction of the system and triggered a safety braking of the entire system becomes.

Finally, the hydraulic control of the entire system, including drum carrier and compensation disc device can be designed so that for maintenance purposes, both cylinders together or each cylinder can be driven separately up and down.

In a device and a method as described, the compensation of the rope loads is hydraulic. The position of the cylinders is constantly monitored. If a cylinder leaves the normal working area, a warning is issued and the shutdown circuit of the entire system is triggered. If a cylinder leaves the max. Compensation area, is assumed by a Fehlspulung and it is triggered a safety braking. If the load in both ropes becomes too large, damage to the hydraulic system and the cylinders will be prevented. A malfunction of the hydraulically operating system is monitored by means of the mechanical safety devices.

The device and the method according to the invention therefore provides a multiple monitoring of the different rope loads through the compensating pulleys, as well as a monitoring of the compensating pulleys and malfunction of the hydraulic system. In addition, the mechanical stops protect the compensating cable pulleys from damage caused by cable overload or from excessive operating load.

• Fig.1 die Seitenansicht einer Ausführungsform der Kompensationsseilscheibenvorrichtung nach Maßgabe der Erfindung;
• Fig. 2 die Kompensationsseilscheibenvorrichtung nach Fig. 1, dargestellt ohne Stahlbau;
• Fig. 3 die freigestellte Ansicht der Ausgleichszylinderanordnung der Kompensationsseilscheibenvorrichtung der Fig. 1 und/oder 2;
• Fig. 4 eine Detailansicht des Endschalteranbaus der Kompensationsseilscheibenvorrichtung nach den Figuren 1 und/oder 2.
• Fig. 5 ein Diagramm, welches die Arbeitsbereiche des Zylinders nach Fig. 3 illustriert;
• Fig. 6 eine Detailansicht einer Lastausgleichswippe, wie sie in der Kompensationsseilscheibenvorrichtung nach den Fig. 1 und/oder 2 vorgesehen ist;
• Fig. 7 einen vergrößerten Ausschnitt der Lastausgleichswippe nach Fig. 6.; und
• Fig. 8 ein Steuerschema der hydraulischen Anlage der Kompensationsseilscheibenvorrichtung nach den vorhergehenden Figuren.

Further features and advantages of the invention will become apparent from the following, in no way limiting, description of a preferred embodiment of the invention with reference to the accompanying drawings. It shows:

• Fig.1 the side view of an embodiment of Kompensationsseilscheibenvorrichtung according to the invention;
• Fig. 2 the compensating rope pulley device Fig. 1 , shown without steel construction;
• Fig. 3 the isolated view of the compensation cylinder arrangement of the compensating pulley device Fig. 1 and / or 2;
• Fig. 4 a detailed view of the limit switch mounting of Kompensationsseilscheibenvorrichtung after the FIGS. 1 and / or 2.
• Fig. 5 a diagram showing the working areas of the cylinder Fig. 3 illustrated;
• Fig. 6 a detailed view of a load balance rocker, as in the Kompensationsseilscheibenvorrichtung after the Fig. 1 and / or 2 is provided;
• Fig. 7 an enlarged section of the load balance rocker after Fig. 6 . and
• Fig. 8 a control diagram of the hydraulic system of Kompensationsseilscheibenvorrichtung according to the preceding figures.

Identical elements are provided in all figures with identical reference numerals.

Of the Fig.1 the side view of a preferred embodiment of Kompensationsseilscheibenvorrichtung according to the invention can be seen. There are two pulleys 10 guided vertically in slide frame 8 and mounted on hydraulically short closed cylinders 1 can be seen. The guide of the slide frame 8 takes place by means of steel structural frames 12 arranged guide rails 14, on each of which the slide frame 8 arranged end rollers 16 and edge rollers 18 run.

The compensating rope pulley device as in Fig. 1 has a multi-redundant monitoring of the different acting on the sheaves 10 rope loads on the hydraulic cylinder 1, which communicatively connected to the plant control (not shown) of the drum carrier (not shown).

The multi-redundant monitoring of the different acting on the sheaves 10 rope loads on the hydraulic cylinder 1 is in the preferred embodiment per cylinder 1 from a linear displacement sensor 20, an upper Vorabschalter 7c and an upper Endabschalter 7b, a lower Vorabschalter 7c and an upper Endabschalter 7b and a cylinder pressure monitoring (not shown) of the cylinder 1. The displacement measuring devices 20 transmit the position of the respective sheave 10 to the electrical control (not shown). The limit switches 7c, 7b are used for warning and end position shutdown.

Furthermore, the Fig. 1 can be seen that in each case a mechanical stop 22 is provided above the respective lower cylinder end point, for safe lowering of the slide frame 8 in case of overload in the hydraulic system and avoidance of mechanical damage to the respective cylinder.

Finally, the Kompensationsseilscheibenanordnung after Fig. 1 a load balance rocker 24 for receiving the loads of the pulleys 10 with on both sides, mechanical stop on which the hydraulically short closed cylinder 1 are arranged. At the same loads on the pulleys 10, this load balance rocker 24 is in balance. In addition, the load balance rocker 24 is provided on both sides in each case with spring packs 26, which allow a tolerance value for the rockers.

The Fig. 2 shows the compensation rope pulley device Fig. 1 shown without steel construction and slightly enlarged for better visibility of the essential elements of the Kompensationsseilscheibenvorrichtung. The illustrated elements are identical to those of Fig. 1 ,

The Fig. 3 moreover, shows an isolated cylinder 1 of the arrangement according to FIGS FIGS. 1 and / or 2. In particular, that already related to the Fig. 1 mentioned on the cylinder 1 provided linear displacement sensor 20 can be clearly seen here.

The Fig. 4 shows a detailed view of the limit switch mounting of Kompensationsseilscheibenvorrichtung after the FIGS. 1 and / or 2. The guide rails 14 on which the end rollers 16 and the edge rollers 18 arranged on the slide frame 8 run can be seen. However, the upper and lower advance switches 7c and the upper and lower limit switches 7b can also be seen. Of the Fig. 4 but beyond that, a arranged on the slide frame 8 switching flag 30 can be seen, with the aid of the advance and limit switches 7c, 7b can be actuated when the slide frame 8 passes over corresponding area, which would lead to the shutdown of the entire system.

The Fig. 5 shows a diagram showing the working areas of the cylinder 1 Fig. 3 and Fig. 4 illustrated. The positions b and c correspond to the locations of the advance and end switches 7c, 7b. Point a) defines in the diagram a mechanical safety area of the cylinder 1 up to the retracted end position.

The points b) each define a border area, which is referred to as security and Fehlspulbereich. If the switch flag is located in these areas, this is a clear indication of a malfunction (faulty winding) of the system and the system is shut down via safety braking.

The points c) define a boundary area, which is called the maximum compensation area. This is the area in which the cylinders 1 are allowed to deflect as much as possible in order to compensate for differences in the rope loads resting on the sheaves 10 in order to ensure a load equilibrium in the system. In this area, a warning is issued and blocking the system after completion of the drive cycle (shutdown inhibit circuit).

Points d) define an area called a normal work area. This is the width in which the cylinder 1 is allowed to move normally to compensate for differences in the resting on the pulleys 10 rope loads.

The point e) finally defines the starting position of the respective cylinder, which in the illustrated embodiment is located at about 55% cylinder travel above the point 0 mm (cylinder fully retracted).

The Fig. 6 shows the detail view of the load balance rocker 24, as in the Kompensationsseilscheibenvorrichtung after the Fig. 1 and / or 2 is provided. The load balance rocker 24 consists of the actual rocker 24a and the bearing block 24b. Again FIG. 6 can still be seen, the rocker on both sides eyes 28 for fixing the cylinder 1. The load balance rocker also has on both sides of a (not shown) mechanical stop, in the event that the load balance rocker 24 is significantly deflected. This would only be the case with unequal loads on the pulleys 10, ie in the case of a danger or malfunction. At the same loads on the pulleys 10, the load balance rocker 24, however, in balance. Again Fig. 6 can also be seen, to counteract the display of very small load differences and the constant tilting of the load balance rocker 24, mounted to support on both sides of the rocker spring assemblies 26, which allow a tolerance value for the rockers. If this tolerance value is exceeded, the rocker 24 is located on one side and damage to the system is prevented. On both sides of the load balance rocker 24 is, as in Fig. 7 to recognize, also ever a linear transducer 32 for measuring the rocker mounted, the path difference is constantly monitored by the system controller (not shown) of the drum carrier.

The Fig. 8 Finally, a control scheme of the hydraulic system of Kompensationsseilscheibenvorrichtung after the preceding FIGS. 1 to 7 , For the hydraulic balancing circuit, a control block 1a is integrated on each cylinder 1. About a pipe rupture protection 3 and a switching valve 4, the cylinder volume balance out by means of pipe or hose connection between the two control blocks. With cable break load, the resulting overpressure on the valve 5 is limited. By switching the valves 4, the corresponding balancing cylinder 1 is locked and the second balancing cylinder 1 can be compensated by means of the directional control valves in the hydraulic unit in its stroke position relative to the locked cylinder. On the cylinder rod side of the pipe connection is used to equalize the volume or can be nachgesaugt in cable breakage and sinks the working position oil volume from the oil reservoir of the hydraulic unit 34. The pressure switches 2 indicate the change of the load conditions and transmit the values to the electric control (not shown). The displacement measuring devices 20 transmit the position of the respective pulley to the (not shown) electrical control. The limit switches 7 (7a, 7b) are used for warning (shutdown inhibit circuit) and end position shutdown (shutdown by safety braking).

Claims (12)

1. A compensation sheave arrangement for drum winders with at least two sheaves (10) that are vertically guided in slide frames (8) and mounted on hydraulically short-circuited cylinders (1), characterized in that a multiply redundant monitoring of the varying rope loads acting on the sheaves is provided via the hydraulic cylinders, said monitoring being communicatively connected to the system control of the drum winder.
2. The compensation sheave arrangement according to claim 1, characterized in that the multiply redundant monitoring via the hydraulic cylinders of the varying rope loads acting on the sheaves consists of at least respectively one linear displacement transducer (20), at least one limit switch and at least one cylinder pressure monitoring means.
3. The compensation sheave arrangement according to claim 1 or 2, characterized in that in each case a mechanical stop (22) is provided above the respective lower cylinder end point for safe lowering of the slide frames in the event of an overload in the hydraulic system and for avoiding mechanical damage to the respective cylinder.
4. The compensation sheave arrangement according to any of the preceding claims, characterized in that the hydraulically short-circuited cylinders are arranged on a mechanical load balancing rocker (24) with a mechanical stop on both sides for receiving the loads of the sheaves, said load balancing rocker being in balance when the loads on the sheaves are equal.
5. The compensation sheave arrangement according to claim 4, characterized in that the load balancing rocker is provided on both sides with a respective spring assembly (26) permitting a tolerance value for the seesawing.
6. The compensation sheave arrangement according to claim 4 or 5, characterized in that on both sides of the rocker, a linear displacement transducer (32) is respectively attached for measuring the seesawing, the path difference of which is continuously monitored by the system control.
7. A method for operating a compensation sheave arrangement for drum winders with at least two sheaves (10) that are vertically guided in slide frames (8) and mounted on hydraulically short-circuited cylinders (1), characterized by the provision of a monitoring via the hydraulic cylinders of the varying rope loads acting on the sheaves, said monitoring being multiply redundant and communicatively connected to the system control of the drum winder.
8. The method according to claim 7, characterized in that the multiply redundant monitoring comprises the following steps of:

   a. continuously monitoring the position of the cylinders by a distance measuring system;

   b. monitoring the position of the cylinders by the provision of limit switches (7) at the transition points of the operating ranges;

   c. continuously monitoring the pressure in the cylinders and discharging the oil into a tank upon exceeding a defined value, as well as lowering the slide frames on mechanical stops above the lower cylinder end points.
9. The method according to claim 7 or 8, characterized in that further, for monitoring the malfunction of the hydraulically operating system, a mechanical load balancing rocker (24) is provided which has a bilateral, mechanical stop for receiving the loads of the sheaves and is in balance when the loads on the sheaves are equal.
10. The method of claim 9, characterized in that in order to prevent the indication of very small load differences and to counteract a continuous tipping of the load balancing rocker, spring assemblies (26) are provided between the cylinders and the load balancing rocker, said spring assemblies permitting a tolerance value for the seesawing, wherein, when this tolerance value is exceeded, the rocker rests on one side and a damage to the system is prevented by a corresponding signal to the system control.
11. The method according to claim 9 or 10, characterized in that further on both sides of the load balancing rocker one respective linear displacement transducer (32) is provided, wherein the path difference thereof is continuously monitored by the system control, and if the difference becomes too large and leaves the tolerance range, the malfunction of the system is detected and a safety braking of the entire system is triggered.
12. The method according to any of the claims 7 to 11, characterized in that the hydraulic control is configured such that for maintenance purposes the cylinders can be lifted and lowered jointly or separately.

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