EP0657380A2 - Device for cable prestressing adjustment of a skip - Google Patents

Abstract

To uniformly develop a prestress, an extension device consists of an extension cable, which is fastened to one of the telescopic segments and runs out on a ladder extension winch on which a hydraulic extension motor (6) is arranged, and of a slack cable block (2) arranged upstream of the hydraulic extension motor (6). The winding drum is connected to a hydraulic bearer motor (9, 9') to which a hydraulic resistance (10, 10') is allocated. The hydraulic motors (6, 9, 9') and the hydraulic resistance (10, 10') can be operated separately from one another in a hydraulic system and can be activated separately, the hydraulic bearer motor (9, 9') running idle during operation of the hydraulic extension motor (6), and oil pressure being admitted to the hydraulic bearer motor (9, 9') after the ladder extension function is complete so that the bearer cable is tensioned during the unwinding and in the extended end position. <IMAGE>

Description

• einer Ausfahreinrichtung zum Ausfahren wenigstens eines Teleskopsegmentes des Anlageaufzuges,
• einem Unterzugseil und wenigstens einem Abstandshalter, die den Seilunterzug bilden und
• einer Wickeltrommel oder dergleichen, auf die das Unterzugseil aufläuft und einen Seilspeicher bilden.

The invention relates to a device for adjusting the pretension on the cable girder of a feed elevator, consisting of

• an extension device for extending at least one telescope segment of the system elevator,
• a beam and at least one spacer, which form the cable beam and
• a winding drum or the like, on which the girder rope runs and form a rope storage.

DE 31 37 846 A1 discloses a feed elevator consisting of individual telescope segments. When extending the telescope segments with the help of a crank, lowering cables are pulled off a winding drum and spacers are opened. As a result, two cable girders lying parallel to each other are formed. The pretensioning of the beam cables is generated by hydraulic, electrical, pneumatic means or by a spring mechanism and held by a cable holding device which is designed as a brake. How the bias is set, however, is not disclosed. In addition, mechanical braking leads to damage to the beam cables and to an uneven formation of the pretension.

The object of the invention is to provide a device for adjusting the pretension on the cable girder of a feed elevator to create, which is simple in operation and which ensures an even rope tension.

• daß die Ausfahreinrichtung aus einem an einem der Teleskopsegmente befestigten Ausfahrseil, das auf einer Leiterausfahrwinde aufläuft, an der ein Ausfahrhydromotor angeordnet ist, und einem, dem Ausfahrhydromotor vorgeordneten Schlaffseilblock besteht,
• daß die Wickeltrommel mit einem Unterzughydromotor verbunden ist, dem ein hydraulischer Widerstand zugeordnet ist, und
• daß die Hydromtore und der hydraulische Widerstand in einem hydraulischen System getrennt voneinander betreibbar und separat ansteuerbar sind, wobei beim Betrieb des Ausfahrhydromotors der Unterzughydromotor im Leerlauf mitläuft und nach Beendigung der Leiterausfahrfunktion der Unterzughydromotor mit Öldruck beaufschlagt ist, so daß das Unterzugseil beim Abrollen und in der ausgezogenen Endstellung gespannt ist.

According to the invention, the object is achieved by

• that the extension device consists of an extension cable attached to one of the telescope segments, which runs onto a ladder extension winch on which an extension hydraulic motor is arranged, and a slack rope block arranged upstream of the extension hydraulic motor,
• that the winding drum is connected to a sub-frame hydraulic motor, which is associated with a hydraulic resistance, and
• that the hydraulic gates and the hydraulic resistance in a hydraulic system can be operated separately and controlled separately, the undercarriage hydro motor running at idle during operation of the extending hydraulic motor and after the end of the ladder extension function the undercarriage hydraulic motor is pressurized with oil pressure, so that the underwire rope when unrolling and in the extended end position is cocked.

The advantages achieved by the invention consist in particular in that the lower cable is constantly kept under tension when the individual telescopic segments are extended by the lower hydraulic motor and the associated hydraulic resistance. This prevents the rope from slackening. If, on the other hand, the telescopic segments are fully extended, the undercarriage hydro motor and the hydraulic resistance provide the necessary rope tension and limit the tensioning pressure. This procedure treats the underslung cable gently and is not subject to any external mechanical influences, so that there is no damage and no impairment of the underside of the rope and thus the safety of the entire lift.

It is advantageous if each cable girder is associated with a girder hydromotor with an associated hydraulic resistance. This ensures that the gusset cables are kept evenly under tension and that any irregularities resulting when they are extended can be corrected, so that both gusset cables ensure a uniform tensioning of the cable gusset. This ensures in particular the statics of the hoist and guarantees its load-bearing capacity.

• daß ein Steuerblock über den Schlaffseilblock mit Hydroleitungen am Ausfahrhydromotor angeordnet ist, wobei in der ersten Hydroleitung nach dem Schlaffseilblock ein Verstellblock liegt und dem Ausfahrhydromotor eine Hydrobremse zugeordnet ist, die direkt mit dem Schlaffseilblock verbunden ist, und
• daß an der zweiten Hydroleitung über ein Rückschlagventil der erste Unterzughydromotor mit dem ersten hydraulischen Widerstand und der zweite hydraulische Widerstand mit dem zweiten Unterzughydromotor liegt, wobei die Leitung vom zweiten Unterzughydromotor, die über beide hydraulische Widerstände führt, zwischen dem Rückschlagventil und dem ersten Unterzughydromotor anliegt und in der Leitung, die beide hydraulischen Widerstände untereinander verbindet, ein Ventilblock liegt, der mit der ersten Leitung zwischen dem Schlaffseilblock und dem Verstellblock verbunden ist.

It is advantageous

• that a control block is arranged on the slack rope block with hydraulic lines on the extension hydraulic motor, an adjusting block being located in the first hydraulic line after the slack rope block and a hydraulic brake assigned to the extension hydraulic motor, which is connected directly to the slack rope block, and
• that is on the second hydraulic line via a check valve, the first sub-hydraulic motor with the first hydraulic resistor and the second hydraulic resistance with the second sub-hydraulic motor, the line from the second sub-hydraulic motor, which leads through both hydraulic resistances, is present between the check valve and the first sub-hydraulic motor and in the line connecting the two hydraulic resistors to one another there is a valve block which is connected to the first line between the slack rope block and the adjustment block.

A switching device makes it possible to both extend the feed elevator to a predetermined length and, at the same time, to prevent the hoist rope from slackening when unrolling. This is achieved in that the undercarriage hydraulic motors are simultaneously moved by the unwinding of the undercarriage cable from the winding drum during operation of the extension hydraulic motor. Due to the hydraulic resistances a certain counterforce built up. With the same switching element, that is, with the control block, the two sub-hydraulic motors are then actuated, so that the required tension in the cables is given, the two hydraulic resistors ensuring that the tensioning pressure maintains a certain size. The valve block enables easy readjustment if the tension of the two beams is uneven.

The hydraulic resistors are advantageously designed as shock valves, while the adjustment block is a 2/2-way ball valve and the valve block is a 3/3-way valve.

It is advantageous if the telescopic segments and the extension rope are blocked according to the single wedge principle when the two beams are tensioned. This prevents the rope tension from slackening and the telescope segments from retracting. Unlocking of the blockages can advantageously be made possible both manually and by other energy sources such as hydraulics, electrics, pneumatics and the like. This ensures safe operation of the feed elevator.

Fig. 1

einen Hydraulikplan einer Vorspannungseinstellungsvorrichtung,

Fig. 2

einen Anlegeaufzug mit eingebauter Vorspannungseinstellungsvorrichtung in einer schematisch dargestellten Seitenansicht und

Fig. 3

einen Querschnitt durch einen Anlegeaufzug gemäß Fig. 2.

An embodiment of the invention is shown in the drawing and is described below. Show it

Fig. 1

a hydraulic diagram of a preload adjustment device,

Fig. 2

a feed elevator with built-in biasing device in a schematically illustrated side view and

Fig. 3

3 shows a cross section through a feed elevator according to FIG. 2.

A feed elevator 100 is shown in FIGS. 2 and 3. It consists of individual telescopic elements that can be extended using an extension rope 13. When extending, 3 extension ropes 16 and 16 'are pulled off a winding drum and spacers 15 and 15' are brought into position. The spacers 15 and 15 'and the beam cables 16 and 16' form cable beams 12 and 12 '. The feed elevator 100 is held by a base frame 17 to which an extension cylinder 18 is attached, which can raise the feed elevator 100 at a certain angle to the horizontal. The base frame 17 can be loose or fixed with a driving device, for. B. connected to a trailer or a vehicle. A control block 1 and a 3/3-way valve are also mounted on the base frame 17. The extension rope 13 leads to a slack rope block 2, an extension hydraulic motor 6 and a hydraulic brake 7.

1, the control block 1 is connected to the slack rope block 2 via hydraulic lines 4 and 4 '. The hydraulic lines 4 and 4 'lead further to the extendable hydraulic motor 6. A 2/2-way ball valve is arranged in the hydraulic line 4 between the slack rope block 2 and the extendable hydraulic motor 6. A hydraulic brake 7 is connected directly to the extendable hydraulic motor 6. From the hydraulic line 4 'between the slack rope block 2 and the extendable hydraulic motor 6, a side strand goes off, in which a check valve 8 is arranged. Thereafter, in this line there is an under-pull hydromotor 9, to which a shock valve 10 is assigned. After the line has left the shock valve 10, it leads to a 3/3-way valve 11 which is connected to the hydraulic line 4 between the slack rope block 2 and the 2/2-way ball valve 5.

In addition, the 3/3-way valve 11 is connected to a further shock valve 10 ', to which an under-pull hydro motor 9' is assigned. The return line from the hydraulic undercarriage motor 9 'leads via both shock valves 10 and 10' and is connected between the check valve 8 and the undercarriage hydromotor 9. To operate the system, the control block 1 is connected to a power grid. This can be a conventional supply network or a battery-powered operating network.

The operation of the preload setting device, as it results from the illustrated embodiment, is explained:

The hand control lever of control block 1 is steered in the direction of the ladder extension movement. The pressure line labeled "B" is actuated. The ball valve 5 is opened and the hydraulic circuit of the extension hydraulic motor 6 is started. This is fastened with a ladder extension winch and pulls out the telescopic segments 14 via the extension rope 13. At the same time as the ladder extension movement, the lower rope 16 and 16 'is pulled by the winding drum 3. In this case, the two under-pull hydro-motors 9 and 9 'rotate in free circulation, a hydraulic resistance being built up by the shock valves 10 and 10'. Instead of the two shock valves, this hydraulic resistance can also be built up by throttling. In this way, an independent unrolling of the lower rope 16 and 16 'from the winding drum 3 is prevented, so that no slack rope effect occurs.

After the ladder extension function has ended, the 2/2-way ball valve 5 is closed. If the pressure line labeled "B" is now actuated with the control block 1, then the two sub-hydraulic motors 9 and 9 'with oil pressure are in the middle position of the 3/3-way valve 11 acted upon and thus achieve a tension required for operation in the joist ropes 16 and 16 '. The two shock valves 10 and 10 'limit the clamping pressure. The manually operated 3/3-way valve 11 enables a comfortable readjustment in the event of uneven rope tensioning of the right and left beams 12 and 12 '. The telescopic segments and the extension rope 13 are blocked automatically when the desired rope tension of the two beams 12 and 12 'is reached according to the "single wedge principle". Of course, it is also possible to additionally block the two beams 12 and 12 'according to the "wedge principle". The blocks can be unlocked manually as well as by other energy sources such as hydraulics, electrics, pneumatics, etc.

Reference symbol list:

1

Control block

2nd

Slack rope block

3rd

Winding drum

4, 4 '

Hydro pipe

5

2/2-way ball valve

6

Extension hydraulic motor

7

Hydraulic brake

8th

check valve

9, 9 '

Base hydromotor

10, 10 '

Shock valve

11

3/3-way valve

12th

Rope girder

13

Extension rope

14

Telescope segment

15, 15 '

Spacers

16, 16 '

Beam rope

17th

Base frame

18th

Extension cylinder

100

Docking elevator

Claims (6)

Device for setting the pre-tension on the cable girder of a feed elevator, consisting of - an extension device (2, 6, 13) for extending at least one telescope segment (14) of the system elevator, - At least one lower cable (16, 16 ') and at least one spacer (15, 15') which form the lower cable (12, 12 ') and - a winding drum (3) or the like, on which the lower cable (16, 16 ') runs and forms a cable storage device, characterized, - That the extension device consists of an extension cable (13) attached to one of the telescope segments (14), which runs onto a ladder extension winch on which an extension hydraulic motor (16) is arranged, and one, the extension hydraulic motor (6) upstream slack rope block (2), - That the winding drum with a Unterzughydromotor (9, 9 ') is connected, which is associated with a hydraulic resistor (10, 10'), and - That the hydraulic gates (6, 9, 9 ') and the hydraulic resistor (10, 10') can be operated and controlled separately in a hydraulic system, the under-pull hydraulic motor (9, 9 ') being operated when the extending hydraulic motor (6) is in operation. runs idle and after completion of the ladder extension function, the lower hydraulic motor (9, 9 ') is pressurized with oil pressure, so that the lower cable (16, 16') is tensioned when unrolling and in the extended end position. Apparatus according to claim 1, characterized in that each cable girder (12, 12 ') is assigned a girder hydromotor (9, 9') with an associated hydraulic resistance (10, 10 '). Device according to claim 1 and 2, characterized in that - That a control block (1) on the slack rope block (2) with hydraulic lines (4, 4 ') is arranged on the extendable hydraulic motor (6), wherein in the first hydraulic line (4) after the slack rope block (2) is an adjustment block (5) and a hydraulic brake (7), which is directly connected to the slack rope block (2), is assigned to the extendable hydraulic motor (6), and - That on the second hydraulic line (4 ') via a check valve (8) of the first sub-hydraulic motor (9) with the first hydraulic resistor (10) and the second hydraulic resistor (10') with the second sub-hydraulic motor (9 '), wherein the line from the second submersible hydromotor (9 '), which leads over both hydraulic resistors (10, 10'), lies between the check valve (8) and the first submersible hydromotor (9) and in the line, which has both hydraulic resistors (10, 10 ') connects to each other, a valve block (11) is connected to the first line (4) between the slack rope block (2) and the adjustment block (5). Device according to one of claims 1 to 3, characterized in that the hydraulic resistors are designed as shock valves (10, 10 '). Device according to one of claims 1 to 4, characterized in that - That the adjustment block is a 2/2-way ball valve (5) and - That the valve block is a 3/3-way valve (11). Device according to one of claims 1 to 5, characterized in that the telescopic segments (14) and the extension rope (13) are blocked according to the single wedge principle when the two beams (12, 12 ') are tensioned.

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