RU2654443C1 - Bucket lift drive of a career excavator - Google Patents

Abstract

FIELD: excavation and moving of soil.

SUBSTANCE: invention relates to mining machines used in the development of mineral deposits in an open manner, namely to quarry excavators, and can be used in lifting and traction mechanisms. Bucket lift drive of a career excavator contains electric motors and a hoist winch that includes a reducer divided into a low-speed part in the form of a slow-speed reducer and a high-speed part in the form of two planetary gearboxes. Each gearbox is equipped with housing, and on the body of the slow-speed reducer, ring grinds are fixed, fixing the casing of planetary gears, drums and oil baths with temperature and pressure sensors are installed on the output shafts of the slow-speed reducer. Leading shafts of the slow-speed reducer are hollow, they contain the input shafts of planetary gears, at the ends of which are elastic couplings, and the carrier of planetary gearboxes are mounted on the driving shafts of the slow-speed reducer.

EFFECT: provides an improvement in the design of the drive.

1 cl, 3 dwg

Description

The invention relates to mining machines used in the development of mineral deposits in an open way, namely to mining shovels of the type “direct shovel” with electromechanical drives of the main mechanisms, which include a drive for raising and lowering the bucket when digging, and can be used in lifting and traction mechanisms.

There is a known description of the bucket lift drive of a mining excavator (Shovels: construction, installation and repair. Textbook. Vladivostok, DVGTU, 2007, pp. 31-37). The drive includes a bucket lifting winch when digging, mounted on a turntable and driven by a motor using a gear clutch, transmits the rotation to the chevron pair of the gearbox, placed in an oil bath. A chevron pair consists of a pinion shaft mounted on roller bearings and a chevron wheel located on the intermediate shaft. The intermediate shaft is supported by roller bearings, and a gear coupled to the gear wheel to which the lifting drum is mounted is mounted on one of its ends. The drum is mounted on a shaft, also mounted on roller bearings. The hoisting rope is fixed in the holes of the drum. A gear clutch is located between the lifting motor and the gearbox, which can disconnect the motor shaft and gearbox shaft when the lifting mechanism is turned off.

Known drive the bucket lift of a career crawler excavator EKG-15 (mining crawler excavators type EKG-15. Operation manual 3537.00.00.003RE, Izhora Plants OJSC, St. Petersburg, 2000, p. 16). The bucket lifting mechanism comprises a lifting winch with a gearbox, on the output shaft of which there are drums, oil baths with temperature and pressure sensors. The winch is driven by two motors connected to the gearbox by two couplings. At the ends of the output shaft of the gearbox there are drums with lifting ropes fixed to them. Two-stage hoist winch gearbox, first stage with split power flow. The gears of the high-speed and low-speed gearbox are lubricated by spraying oil from the gearbox bath.

The disadvantages of the lifting mechanism ECG-15 include the large dimensions and weight of the lifting winch.

The prototype can be an EKG-32R mining excavator with a compact and reliable bucket lift drive, the design of the hoist winch is improved using two planetary stages and effective lubrication at low temperatures (RF Patent No. 2481439, IPC B66D 1/70, E02F 3/46). The hoist drive contains a hoist winch, including two electric motors connected to a gearbox, on the output shaft of which there are drums, oil baths with temperature and pressure sensors. The hoist winch gearbox is divided into a low-speed part in the form of a low-speed gearbox and a high-speed part in the form of two planetary gearboxes. Each gearbox is equipped with a casing, and ring grindings are made on the casing of the low-speed gearbox, in which they are fixed. Half-couplings are installed on the input shafts of the planetary gearboxes, and the drive shafts of the low-speed gearbox are located in the output carriers of the planetary gearboxes and are connected by a gear transmission with internal gearing. Oil baths of low-speed and high-speed reducers are made in the form of interconnected vessels.

The technical task of the invention is the creation of a maintainable, compact and reliable drive for lifting the bucket of a mining excavator by improving the design of the hoist hoist by performing gearboxes.

The stated technical problem is solved in that the bucket lift drive contains electric motors and a hoist winch, which includes a gearbox divided into a low-speed part in the form of a low-speed gearbox and a high-speed part in the form of two planetary gearboxes. Each gearbox is equipped with a casing, and ring grindings are made on the casing of the low-speed gearbox, which fix the planetary gearcases. Drums and oil baths with temperature and pressure sensors are installed on the output shafts of the low-speed gearbox. The drive shafts of the low-speed gearbox are hollow; the input shafts of planetary gearboxes are located at the ends of which the elastic coupling halves are located. Drove planetary gears mounted on the drive shafts of the low-speed gearbox.

The placement of the gearboxes in separate housings creates a block structure, which increases the maintainability of the lifting winch and allows for repair by the aggregate method.

Ring sharpenings on the housing of a low-speed gearbox, for installation and fixing relative to the teeth, rigidly fix the planetary gearboxes, providing high-quality engagement, which eliminates distortion during operation.

The implementation of high-speed gearboxes in the form of a single-stage planetary gear with a stopped central wheel with internal gearing and the placement of planetary gearboxes on the drive shafts of a low-speed gearbox makes the assembly compact and reduces the gear module.

The oil baths of the low-speed and planetary gearboxes are made in the form of communicating vessels, therefore, the heated oil from the bath of the low-speed gearbox is fed to high-speed gearboxes and from there flows back into the oil bath of the low-speed gearbox. Thus, efficient lubrication of planetary gears at low temperatures is ensured, which is very important, since the dimensions of the assembly do not allow placing additional heaters.

The drive shafts of the low-speed gearbox are hollow, the input shafts of planetary gearboxes are placed in them, which significantly reduces the dimensions of the pressure winch.

The drawings show:

FIG. 1 is a general view of a turntable with installed equipment (top view);

FIG. 2 - lifting winch (top view);

FIG. 3 - high-speed and low-speed gearboxes of a lifting winch.

In FIG. 1 shows a rotary platform 1, it has working equipment 2, a cab 3, electrical equipment 4, a rotation mechanism 5, a lifting mechanism - a lifting winch 6.

In FIG. 2 shows a hoist winch 6 (top view), comprising two electric motors 7, drums 8, a low-speed gearbox with a housing 9, planetary gearboxes with bodies 10, elastic couplings 11, connecting hoses 12, brakes 13, an oil bath of a low-speed gearbox 14, an output shaft 15 low-speed gearbox 9, pump 16.

In FIG. 3 shows a planetary gearbox 10 of a lifting winch 6 in conjunction with a low-speed gearbox 9 (in section). On the casing of the low-speed gearbox 9, ring sharpenings are made 17. The drive shaft 18 of the low-speed gearbox 9 is hollow. The planetary gearboxes 19 have been driven on the drive shaft 18. The planetary gearboxes 10 comprise satellites 20, a fixed central wheel 21, the planetary gearbox housing 22, the planetary gearbox drive gear shaft 23, and the planetary gearbox oil bath 24.

Cases 22 of planetary gearboxes 10 (Figs. 2 and 3) are installed in ring sharpeners 17 on the casing of the low-speed gearbox 9. The gearboxes 9 and 10 of the lifting winch are used to transmit rotation from electric motors 7 to the drums 8 of the lifting winch 6. Tube 12 connects the oil bath 14 of the low-speed gear 9 and the oil bath 24 of the planetary gear 10. The elastic couplings 11 are installed on the input shafts 23 of the planetary gears.

The input gear shaft 23 is engaged with the satellites 20 located on the carrier 19.

Drove 19 on the slots installed on the drive shafts 18 of the low-speed gearbox 9. On the output shaft 15 of the low-speed gearbox 9 are drums 8.

Digging an excavator is as follows. At the beginning of digging, the bucket is installed in the face, then with the drives and pressure mechanisms (not shown in the figures) and bucket lifting — with a hoist 6, the bucket is moved along the face until filling, followed by turning the excavator to unload and back to the face. The lifting mechanism serves to raise and lower the bucket and consists of a lifting winch 6 and ropes.

The rotation from the electric motors 7 to the planetary gears 10 is transmitted through the elastic couplings 11. Then, through the satellites 20 of the planetary gears 10 with the central wheel 21 stopped, the drive shafts 18 of the low-speed gearbox 9 are driven, and then its output shaft 15 with drums 8, on which the lifting gears are located bucket ropes. Thus, the driving shafts of the low-speed gearbox 9, receiving rotation from planetary gearboxes 10, transmit it to the gear wheel (not shown in the figures) mounted on the output shaft 15, transmitting rotation to the drums 8.

Effective lubrication is carried out by spraying oil with a gear on the output shaft 15 and carriers 19 with satellites 20 of planetary gearboxes 10. Heated oil is supplied to the planetary gearboxes 22 using a pump 16 from the oil bath 14 of a low-speed gearbox 9.

The application of the invention allowed to create a compact and maintainable drive for lifting the bucket, which is used in new mining excavators EKG-12K.

Claims (1)

A mining excavator bucket lifting drive comprising electric motors and a hoist winch, which includes a gear divided into a low-speed part in the form of a low-speed gear and a high-speed part in the form of two planetary gears, each gearbox is equipped with a housing, and ring grindings are made on the low-speed gear housing, fixing planetary gears gearboxes, drums and oil baths with temperature and pressure sensors are installed on the output shafts of the low-speed gearbox, characterized in that the drive shafts are quiet the drive gearbox is hollow, the input shafts of planetary gearboxes are located at the ends of which the elastic coupling halves are located, and the planetary gearbox carriers are mounted on the drive shafts of the slow gearbox.

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