AU680083B2 - Cold air supply for drive sheave-hoisting machines - Google Patents

Description

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AUSTRALIA

Patents Act COMPLETE SPECIFICATION

(ORIGINAL)

Class Int. Class Application Number: Lodged: Complete Specification Lodged: Accepted: Published: Priority Related Art: toll ot 0 00I 00 0E 0 0 0 O 00l 111 Name of Applicant: MAN Gutehoffnungshutte AG Actual Inventor(s): Walter Schroder SWolfgang Schubert 0 0, Address for Service: PHILLIPS ORMONDE FITZPATRICK Patent and Trade Mark Attorneys 367 Collins Street Melbourne 3000 AUSTRALIA Invention Title:

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COLD AIR SUPPLY FOR DRIVE SHEAVE-HOISTING MACHINES Our Ref 396969 POF Code: 1308/1308 The following statement is a full description of this invention, including the best method of performing it known to applicant(s): COLD AIR SUPPLY FOR DRIVE SHEAVE-HOISTING MACHINES The invention relates to a drive sheave-hoisting machine with an internally located electric motor for driving hoisting ropes, whereby the rotor is connected with the cylinder jacket of the drive sheave via at least one web plate and the stator is fastened on an axle lying in pillow blocks and on a foundation plate, and whereby the hollow space being enclosed by the cylinder jacket, the lateral shields and antifriction bearings and containing the electric motor can be acted upon with cold air for the forced draught of the electric motor.

The German patent specification DE 37 05 567 describes a hoisting machine with a drive sheave and an electric motor for driving hoisting ropes used in mining, whereby the rotor of the motor is connected with the drive sheave being designed as So°19 cylinder jacket and whereby the stator of the motor is fastened on a supporting structure featuring foundation bearings.

The motor is arranged inside the cylinder jacket whereby the cylinder jacket forming the drive sheave lies on S. 2(3 antifriction bearings at the inside, which are retained by oo bearing plates being stationary over the outer circumference and being supported on the supporting structure. The sheave-shaped bearing plates are provided with openings for the ventilation of the motor.

o 025 The machine according to the DE 37 05 567 is a laborious °o construction. The antifriction bearings have a very large diameter, and are, therefore, expensive and cause high tangential speeds. This inevitably entails lubrication problems so that oiling may be necessary. As a result costly seals for the antifriction bearings are required.

o)a The German specification DE 42 22 094 describes a drive sheave-hoisting machine with an internally located electric motor which is arranged between the shields of the drive sheave. The stator of the electric motor is attached to a hollow axle which together with trestles is situated on foundations.

The ventilation of the electric motor is effected via the hollow axle which is connected to a cold air inlet and outlet channel. The hollow axle features a radially arranged L Itransverse wall or bulkhead, respectively, at the inside and has peripherally arranged openings for the inlet and outlet of the cold air.

The hollow axle, being a cast or forged construction, is laborious and costly. Being a cast construction this component involves all the risks of cast parts. The hollow shaft is weakened by transverse openings. The fastening of the stator seems to be problematic. Moreover, problems can arise if the hollow shaft gets jammed at the pillow blocks (absorption of motor torques). Finally, the installation of the bulkhead can cause problems.

Furthermore, the DE-Z: Glackauf 125 (1989) No. 13/14 pages 829-832 describes a drive sheave-hoisting machine with u o an internal motor for driving hoisting ropes, in which case 0 I the rotor is connected with the cylinder jacket of the drive 4 sheave by a web plate, and the stator is fastened on a 0 stationary axle by means of clamping ring connections, whereby 0 o cold air is fed to the interior space of the cylinder jacket via openings in the lateral shields.

-2C This drive sheave-hoisting machine is enclosed by cold o 0 air caps at both sides which are equipped with inlet and outlet channels for the cold air. The disadvantages of this o o0 embodiment lie in the production and assembly requirements as well as in the demands that have to be made on the 0000 0o25 impermeability of the joint between cap and drive sheave in o 0a order to guarantee an effective cooling.

In respect of the drive sheave-hoisting machine of the kind described in the preamble it is an object of the invention to feed cold air to the integrated motor in a simple and economical manner, whereby advantages of the conventional hoisting machine construction with an external motor are maintained while one or more of the abovementioned disadvantages of known hoisting machines are substantially avoided.

According to an aspect of the present invention there is provided a drive sheave-hoisting machine including: a stationary axle mounted on a foundation; a cylinder jacket spaced from and extending around the axle; -3an electric motor located within the cylinder jacket for driving hoisting ropes, the motor having a rotor connected with the cylinder jacket via at least one web plate and a stator fastened to the axle; and lateral shields extending between the cylinder jacket and the axle to antifriction bearings disposed spaced from and about the axle for supporting the cylinder jacket; the cylinder jacket, lateral shields and antifriction bearings defining a space containing the electric motor which can be acted upon for the forced draft cooling of the electric motor; wherein ventilation rings having air openings are disposed between the axle and the antifriction bearings to enable forced air cooling of the electric motor.

o° In an exemplary embodiment of the inventive hoisting l machine the axle is preferrably forged from a carbon steel S which has high notched bar impact rates. The axle is almost 0 0 steady in the diameter course, with the exception of the flanges for fastening the stator. It has neither hollow nor transverse bores. Since the axle has no weakening bores it S can be designed in a relatively slim manner.

0 The stator is reliably fastened by means of clamping ring connections. The stator can be radially adjusted for the purpose of compensating the ventilation slot.

Ventilation rings for the openings through which the -o26 cold air penetrates are provided between the axle and antifriction bearings at both sides. The antifriction bearings are attached on the outside diameter of the ventilation rings. Thus the antifriction bearings obtain the diameter being required for its durability without having to adjust the diameter of the shaft.

The ventilation rings are stationary and are not able to rotate. They are provided with axial openings allowing the cold air to pass through. The channels for the forward and backward movement of the air cooler are connected to the ventilation rings.

The advantages of the inventive embodiment are described in the following: The axle is forged from carbon steel with a high notched bar impact value, the axle is weakened neither by longitudinal nor transverse bores, the diameters of the antifriction bearings are in conformity with the ventilation ring, the axle can be optimized to the actual load, the axial alignment of the antifriction bearings during the assembly is more easily feasible on the inventive ventilation rings than on an axle, compared with prior art constructions the inventive embodiment is technically better and lower in cost at the same time.

Exemplary embodiments of the invention are hereinafter explained by means of the schematic drawings.

Fig. I shows a cross section through the drive °i sheave-hoisting machine with an internal electric motor, and ig. 2 shows a section A-A as view of a ventilation ring.

According to Fig. 1 four grooves of a sheave (14) are arranged on the drive sheave-cylinder jacket One front face features radially outwardly projecting brake discs (12) oo into which the non-illustrated brakes can engage.

The drive sheave-cylinder jacket (13) is supported on o "o the antifriction bearings via lateral shields being equipped with manholes (10) and coverings whereby the antifriction bearings, in turn, lie on the ventilation rings A circumferential web plate (15) is centrally provided at the inside circumference of the drive sheave-cylinder jacket on which the rotor (16, 17) is fastened. Opposite the rotor (16, 17), separated by a ventilation slot the stator (19) is provided releasably connected with the axle (1) by means of clamping ring connections The axle is clamped into a bedding (21) which supports itself on the foundation (23) by means of foundation plates (22).

The ventilation rings are fastened on the axle (1) Antifriction bearings are provided on the ventilation rings The cold air penetrates from the outside through openings on one side in the interior space, is forcibly t led through the ventilation slot (18) between the rotor (16, 17) and the stator (19) and escapes from the interior space through the openings located at the opposite side. The cold air supply to the ventilation rings is effected by non-illustrated channels. The heated air is carried off to the non-illustrated air recooling plant in an analogous manner.

Fig. 2 shows a section A-A as a view of a ventilation ring in the area of the axle In the case of this exemplary construction the ventilation ring includes an inner ring an outer ring and spoke elements (3) arranged therebetween.

The axially arranged openings for supplying and 0 carrying off the cold air for the internal electric motor of So lE the drive sheave-hoisting machine are formed between the spoke elements (3) 0 0 0 0 00 oo 0B2 C 0 0 oo 0 6

Claims (12)

1. A drive sheave-hoisting machine including: a stationary axle mounted on a foundation; a cylinder jacket spaced from and extending around the axle; an electric motor located within the cylinder jacket for driving hoisting ropes, the motor having a rotor connected with the cylinder jacket via at least one web plate and a stator fastened to the axle; and lateral shields extending between the cylinder jacket and the axle to antifriction bearings disposed spaced from and about the axle for supporting the cylinder jacket; the cylinder jacket, lateral shields and antifriction bearings ~defining a space containing the electric motor which can be i acted upon for the forced draft cooling of the electric motor; 00 wherein ventilation rings having air openings are o disposed between the axle and the antifriction bearings to enable forced air cooling of the electric motor.

2. A drive sheave-hoisting machine as claimed in claim 1 02C wherein the lateral shields are annular and extend toward the 0409 0o axle from either end of the cylinder jacket, and wherein the ventilation rings are located between the lateral shields and S the axle with the antifriction bearings mounted thereon.

3. A drive sheave-hoisting machine as claimed in claim 1 or 0250 claim 2 wherein the ventilation rings each include an inner Sring for mounting about the axle, an outer ring concentric with the inner ring, and at least one support element disposed between the inner ring and the outer ring defining one or more air openings between the inner ring and the outer ring.

4. A drive sheave-hoisting machine as claimed in claim 3 wherein the antifriction bearings are mounted at the outer E ring of each ventilation ring.

A drive sheave-hoisting machine as claimed in any one of the preceding claims wherein a ventilation slot is provided between the rotor and the stator through which the cooling air may be forced.

6. A drive sheave-hoisting machine as claimed in any one of the preceding claims wherein the axle is mounted in pillow blocks on a foundation plate. i i~

7. A drive sheave-hoisting machine as claimed in any one of the preceding claims wherein the stator is fastened to the axle via releasable clamping ring connections.

8. A drive sheave-hoisting machine as claimed in claim 7 wherein the axle includes a steady diameter course and two flanges for fastening the stator via the releasable clamping ring connections.

9. A drive sheave-hoisting machine as claimed in any one of the preceding claims wherein the axle is of unitary construction and is forged from solid steel.

A drive sheave-hoisting machine as claimed in any one of the preceding claims wherein the lateral shields are provided with manholes and coverings.

11. A drive sheave-hoisting machine as claimed in any one of the preceding claims wherein the cylinder jacket is arranged substantially coaxial with the stationary axle.

12. A drive sheave-hoisting machine substantially as herein described with reference to the accompanying drawings. DATED 17 February 1995 :2'3 PHILLIPS ORMONDE FITZPATRICK Attorneys for: 2 MAN GUTEIOFFNUNGSHUTTE AG "044A O"p 0 4 -F t( 7. A drive sheave-hoisting machine as claimed in any one of the preceding claims wherein the stator is fastened to the axle via releasable clamping ring connections. 8. A drive sheave-hoisting machine as claimed in claim 7 wherein the axle includes a steady diameter course and two flanges for fastening the stator via the releasable clamping ring connections. oo .o 4 0 0 s 9. A drive sheave-hoisting machine as claimed in any one of the preceding claims wherein the axle is of unitary construction and is forged from solid steel. A drive sheave-hoisting machine as claimed in any one of the preceding claims wherein the lateral shields are provided with manholes and coverings. 11. A drive sheave-hoisting machine as claimed in any one of 15 the preceding claims wherein the cylinder jacket is arranged substantially coaxial with the stationary axle. 12. A drive sheave-hoisting machine substantially as herein described with reference to the accompanying drawings. DATED 17 February 1995 .2CI PHILLIPS ORMONDE FITZPATRICK Attorneys for: MAN GUTEHOFFNUNGSHUTTE AG Dw~7-V"* a o U 1 II ABSTRACT The invention relates to a drive sheave-hoisting machine with an internal electric motor, whereby the rotor (16, 17) is connected with the cylinder jacket of the drive sheave (13) by at least one web plate (15) and the stator (19) is fastened on the axle Ventilation rings slided on the axle are provided between the axle and the antifriction bearings featuring axial openings for supplying and carrying off cold air. Since the central arrangement of stator rotor (16, 17) and web plate (15) divides the interior space of the drive sheave into two separate volumes, the cold air can go from the entrance side to the exit side only through the ventilation 115 slot (18). 0 00 SC I o fl 0 I I 0 0 0o I 0 S00 o o o 9 9 o o 0 0 0 50 0 .3' 0 0 Fig. 1