GB2208237A

GB2208237A - Motor installation for driving the mining tools of a roadway driving and winning machine

Info

Publication number: GB2208237A
Application number: GB8816683A
Authority: GB
Inventors: Reinhard Neuper; Otto Schetina; Alfred Zitz
Original assignee: Voestalpine AG
Current assignee: Voestalpine AG
Priority date: 1987-07-15
Filing date: 1988-07-13
Publication date: 1989-03-15
Also published as: GB8816683D0; PL273703A1; DE3823762A1; ATA179687A; CS275158B2; AT388209B; DE3823762C2; CS8804964A3

Description

1 v 7 M&C FOLIO:230P56829 WANGDOC: 1263P Motor Installation for Drivinq

the Mining Tools of a Roadway Drivinq and Winning Machine The invention relates to a motor installation for driving of the' mining tools of a roadway-driving and winning-machine with rotatably mounted cutter heads or cutter drums, on which bits are secured, wherein the rotation speed of the rotary drive for the cutting heads or is adjustable.

In the driving of seam roadways it is repeatedly necessary also to cut therein very hard inclusions and, in particular, rock strata with up to 120 MPa resistance. For the cutting of rock of differing resistance, it is necessary to adapt the rotation speed of the cutting head to the particular nature of the rock in question. In order to ensure the maximum economy, i.e. the lowest possible consumption of cutting bits, it is necessary here to change the rotation speed of the cutting head by a factor of up to 5. In the known machines, rotation speed switch-over is performed using change-pole asynchronous motors, in which case, however, for reasons of space occupied, only a rotation speed switch-over in the ratio of up to 2:1 can be achieved, since a change of rotation speed exceeding a factor of 2 2 necessitates having a very large amount of space available, and moreover involves high costs. Change-pole asynchronous motors can be constructed with separate stator windings, in which case usually up to four rotation speeds can be selected. During a switch-over, the nominal tor4ues generally remain the same, the nominal outputs here varying in the ratio of the rotation speeds. Alternatively, change-pole asynchronous motors are known which have only one winding and which are operated in what is called the "Dalander Circuit", in which case, however, only two rotation speeds in the ratio 1:2 are adjusted, and the ratio of the outputs varies between 1:1.5 and 1:1.8. In the case of greater rotation speed ratios, it is not possible, with such motors. to produce the desired output over the whole rotation speed range.

What is desired is a motor installation wherein great rotation speed variations can also be realised without difficulty, and wherein nevertheless the drive only requires a relatively small amount of space.

The present invention provides a motor installation of the type mentioned at the beginning, in which at least two drive motors, with different nominal rotation speeds from one another, are arranged so that they can be coupled with the output shaft.

Due to the fact that two drive motors with different nominal rotation speeds from one another are arranged so z 1 1 3 that they can be coupled with the output shaft, the desired rotation speed range can be substantially enlarged, and nevertheless this can be effected satisfactorily, using small-scale drive motors.

A conventional electro-motor can be used as the main motor, and moreover it only needs to be arranged so as to have one given rotation speed. For the variations of rotation speed which are necessary during operation in each case, a second or auxiliary motor can be used, which here is preferably constructed so as to be adjustable with regard to its rotation speed.. Advantageously, the arrangement may be such that the second drive motor is kinematically connected with the output shaft via the motor shaft of the first drive motor, thereby resulting a particularly compact arrangement of the motors, coaxially behind one another. In accordance with the resistance of the rock. either the main motor or the auxiliary drive is used. and advantageously the arrangement is such that the second drive motor is a hydraulic motor with a nominal rotation speed that is lower than that of the first drive motor. A hydraulic motor of this type can be adjusted within wide ranges as regards its rotation speed. and enables the realisation of a large rotation speed jump between maximum rotation speed and minimum rotation speed.

1 4 The use of such differing drives, of which orm is arranged for high rotation speed and another for low rotation speed, makes it possible to perform coupling of the two drives in simple manner. which affords the desired effect in each case. without any additional control means. In a particularly simple manner. it is possible to have an arrangement for this purpose such that the second drive motor is connectable with the output shaft through a gearbox and a resilient or overrunning coupling. If the second -drive motor is constructed as a hydraulic motor with a rotation speed that is lower than that of the first drive motor, the overrunning coupling, when the main motor is switched on, automatically causes the second drive to be disconnected. Connecting the second drive motor with the output shaft through a gearbox makes it possible to adapt the rotation speed of the second drive motor to the requirements desired in each case. Advantageously, a hydro-coupling of fluid coupling is inserted between a drive motor and the cutting gearing. This type of construction then especially has particular advantages if the second drive is not connected coaxially to the first drive on the motor shaft of the first drive, but on the contrary is coupled with the output shaft, connected after the first motor. Hereby a hydro-coupling can perform, at lower rotation speed of the second drive motor, automatic uncoupling of the main 1 motor, so that the first drive motor does not have to continue running idly therewith. If the connection of the second drive motor with the output shaft is effected through an overrunning coupling, then, conversely, the second drive motor is always disconnected when the first drive with greater rotation speed is coupled with the output shaft.

It is particularly advantageous to have an arrangement such that the first drive motor is constructed as an electro-motor with greater nominal output than the second drive motor, whereby for the main output there is available a main drive motor which, correspondingly, is optimally arranged at only one rotation speed.

For slow cutting, the rotation speed must be reduced correspondingly, and for adapting the cutting speed to the type of material to be extracted, advantageously the arrangement is made such that the second drive for the lower rotation speed, is of adjustable construction and in particular is connected with the output shaft through a torque converter and/or a gearbox. In the case of an electric auxiliary motor, an electronic power control can be provided, in which case here too a torque converter provides a correspondingly high drive output in a large rotation speed range. Further adaptation of the cutting speed at low rotation speed of the heads is provided by the use of a gearbox.

6 The invention is described in further detail as follows, on the basis of an embodiment illustrated diagrammatically in the accompanying drawing.

The drawing shows a top view of a cutting arm of a two-slice roadway driving machine, with the cutter heads 1, it being also possible in this case, of course, for the cutter heads to be replaced by cutter drums. The cutting gearing is located in the cutting arm 2, and the output shaft is arranged in the interior of the cutting arm 2. A motor and gearing mounting 3 carries a cutting motor 4. The cutting motor 4 is an electromotor with two stub shafts, and another drive motor 6 is connected to this cutting motor 4 through a coupling, in particular an overrunning clutch or a switchable clutch 5. The drive motor 6 is a hydraulic motor for lower rotation speeds of the cutter heads 1 or slow cutting. The motor mounting or cutting arm base is provided with a torque support 7.

Alternatively to the coaxial coupling of the two drive motors 4 and 6, the second drive motor can be arranged in the position 61 and can be coupled with the output shaft via a clutch 51. In this construction, it is advantageous to arrange a fluid coupling 8 between the drive motor 61 and the main drive motor 4. optionally, of course, instead of the fluid coupling 8, a resilient coupling or a clutch can be arranged between the cutting motor 4 and the cutting gearing.

S 7 The cutting motor 4, being an electro-motor, has a higher nominal rotation speed than the second drive motor 6 or 61 8

Claims

Claims -

1. A motor installation for driving the mining tools of a roadway-driving and winning machine with rotatably mounted cutter heads or drums on which bits are secured, the rotation speed of the rotary drive for the cutter heads or drums being adjustable, the installation having an output shaft for drivingthe cutter heads or drums, at least two drive motors with different nominal rotation speeds from one another, and means for kinematically connecting the drive motors with the output shaft.

2. An installation as claimed in claim 1. comprising first and second said drive motors, in which the second drive motor is kinematically connected with the output shaft via the motor shaft of the first drive motor.

3. An installation as claimed in claim 1 or 2, comprising first and second said drive motors, in which the second drive motor is a hydraulic motor with a nominal rotation speed lower than that of the first drive motor.

4. An installation as claimed in any preceding claim.

comprising first and second said drive motors, in which the second drive motor is kinematically connected with the output shaft via a gearbox and a resilient or 9 overrunning coupling.

5. An installation as claimed in any preceding claim. including a fluid coupling inserted between a said drive motor and cutting gearing including the output shaft.

6. An installation as claimed in any preceding claim. comprising first and second said drive motors, in which the first drive motor is an electro-motor with greater nominal output than the second drive motor.

7. An installation as claimed in any preceding claim. in which the drive motor for the lower rotation speed is of adjustable construction.

B. An installation as claimed in any preceding claim, in which the drive motor for the lower rotation speed is kinematically connected with the output shaft via a torque converter and/or a gearbox.

9. A motor installation substantially as described with reference to the accompanying drawing.

10. A roadway-driving and winning machine having a motor installation according to any preceding claim.