SU992379A1 - Hoist drive - Google Patents

Description

one

FIELD OF THE INVENTION The invention relates to lifting and transport equipment, in particular, to hoist drives.

The elevator drive is known, which contains a rolling pulley mounted in a support and a multi-roll carrier, circumscribed by a pull tape connected at one end to a lifting vessel and the other with a counterweight, a drive motor with a gearbox and a brake, connected to a multi-roll carrier and mounted on a support beam 1.

The disadvantages of the drive include the need for lever-hinged attachment of the axes of each roller group to output coupling halves by oblique leads arranged in parallel planes, which does not provide sufficient rigidity and reliability of fastening, as well as the complexity of the gearbox group including a differential-planetary gear with rotary epicyclic gears and two parallel gears, which leads to increased metal consumption of the lift drive as a whole. In addition, the drive capacity of the drive is limited due to the flat contact of the pull belt with the rolling bar.

The purpose of the invention is to simplify the design and increase reliability in operation. The goal is achieved by the fact that in a lift drive containing a rolling pulley mounted in a support and a multi roller carrier, bend around with a pull tape connected at one end to a lifting vessel, and the other to a counterweight, drive motor with gearbox and brake connected with a multi-roll carrier and mounted on a support beam, the pulley contains two conical discs made with shafts placed in a support, and the drive is equipped with an additional pulley including two split spring-loaded discs and wedge endless re The device covers the pulleys and is located on the main pulley under the traction belt, and the axial movement of the rolling wheels of the pulley with a servo drive, said carrier comprising a housing and axes fixed to it for rollers.

In addition, the axial movement device of the drive wheel of the rolling wheel contains two crank mechanisms, the arms of which are articulated to the disk shafts, and the crank shafts are kinematically interconnected by a cylindrical gear transmission with a gear ratio equal to one, and one of the shafts is connected to a servo drive through worm transfer FIG. 1 shows the elevator drive, general view; in fig. 2 - drive with leading rollers, general view; in fig. 3 is a kinematic diagram of the mechanism for the axial movement of the rolling wheel bar wheels. The elevator drive contains a rolling pin 1 with support 2 and a multi-roll carrier 3, covered by a traction belt 4, connected to a lifting vessel and a counterweight (not shown), a driving motor 5 with a single-stage gearbox 6 connected to a multi-roll carrier 3 clutch 7, a mechanical brake 8 mounted on the support beam 9. The multi-roll carrier 3 includes a housing 10 and axis II fixed in it for mounting the driving rollers 12. The rolling 1 pulley is made in the form of two coaxial conical discs 13 and 14 with shafts 15 and 16 placed in support 2 at Possibility of axial movement. Pulley 1 is provided with an additional split pin 17, consisting of disks 18 and 19, mounted on a freely rotating shaft 20. Pulley 1 and pin 17 are covered by an endless wedge belt 21, to which disks 18 and 19 are constantly pressed by springs 22. A belt 21 is placed between tapered discs 13, 14 and a pulley tape 4. Pulley 1 is also provided with a mechanism 23 for axial movement of discs 13 and 14 with a servo drive (not shown). The axial movement of the rolling wheels of the sheave pulley is made in the form of two crankshaft-connecting rod mechanisms 24 and 25, the connecting rods 26 and 27 of which are hingedly connected with the shafts 15 and 16, as with the sliders in the support 2. The shafts 28 and 29 of the cranks 30 and 31 are kinematically interconnected by a cylindrical gear 32 with a gear ratio equal to one. The shaft 28 is connected to the servo by means of a worm pair 33. The drive of the elevator works as follows. When the carrier 3 rotates with a constant angular frequency cJ from the drive motor 5 through the red, uctor 6, for example counterclockwise, the drive rollers 12 generate in an endless V-belt 21 and the traction belt 4 pressed against it, whereby the lifting vessel and lowering the counterweight. This is accompanied by rolling the belt 21 and the belt 4 along the conical disks 13 and 14 that are stationary in the circumferential direction and the rolling wheel 1 of the pulley 1. When the drive is reversed, the vessel is lowered and the counterweight is raised.

For one complete revolution of the carrier 3, the vessel moves vertically to the height L, defined by the formula

Ah (abc - ac) Z,

Claims (2)

(1) where abc is the perimeter of the corrugation formed by the pull of the V-belt 21 and the belt 4 from the I rounding pulley; ac-supporting arc of the circle of rolling with radius RO; Z is the number of leading rollers of carrier 3. The value (abc - ac) depends on the ratio of the radius GF, the radius of the centers of the rollers 12-R, and the radius of the rolling RO. The radius of Gf is from the obvious (Fig. 2). expressions gf r-0.5 (5, + S), (2) where 5l is the thickness of the t 4 tape; SP is the working thickness of the V-belt 21; & p is the full thickness of the belt, equal to twice the working thickness of the belt; G - working radius of the drive roller 12. Parameters z, g, Sp, Sp, Sj ,, Pr, R are practically unchanged during the operation of the drive, i.e. Z, G, SP, SP, Sj, Gf, R constans The rolling radius RQ can be changed by axial joint movement of the conical disks 13 and 14 of the pulley 1. So, for example, with the maximum axial approach of these disks 13 and 14, i.e. if the equality RO is observed, R R r "value (abc - ac ) is equal to zero and when the carrier spins 3, the V-belt 21 and the belt 4 will be fixed. The axial movement of the discs 13 and 14 is carried out from the servo drive (Fig. 3) due to the rotation of the worm gear pair 33, the gear train 32, the shafts 28 and 29 and the associated curvature 30 and 31, which by means of the rods 26 and 27 are moved to the desired the axial distance by means of the shafts 15 and 16 and the disks 13 and 14 themselves. Accordingly, the disks 13 and 14 move in the axial direction on the shaft 20 the spring-loaded half disks 18 and 19 of the additional pulley 17. The node of this disk is like a reserve capacity of the wedge segment belt 21. The pulley 17 is idling. Since the lifting vessel can be started and stopped while the driving motor 5 is rotating by changing the axial position of the disks 13 and 14, the inertia moment of the engine 5 does not affect the operation of the drive. The present invention makes it possible to increase the traction capacity of the drive, since the total angle of the girth of the 4th V-belt by the belt (Fig. 2) is approximately equal to Si and substantially exceeds the angle of the circumference of the stationary pulley of the technical solution adopted for the prototype. The total wedge angle of the V-belt 21 of the conical disks 13 and 14 is equal to the wrap angle of the stationary pulley of the device, taken as a prototype. However, the force of adhesion of the V-belt with conical discs is significantly higher than that of a flat belt with a cylindrical pulley 2 to 3 times. Accordingly, the capacity of the proposed lift drive is higher than the prototype type, as well as the safety of operation. In addition, the installation of rollers 12 on stationary axles increases the rigidity and reliability of this very important lift drive assembly. The use of the axial movement mechanism of the tapered running wheel pulley for speed control simplifies the drive gearbox group and reduces its intensity. Claim 1. The elevator drive, comprising a rolling pulley mounted in a support and a multi-roller carrier, circumscribed by a traction belt, connected at one end to a lifting vessel, and the other with a counterweight, driven engine with a gearbox and brake, connected to a multi-roller carrier and installed on the support beam, characterized in that, in order to simplify the construction and increase reliability in operation, the pulley contains two conical disks made with shafts placed in the support, and the drive is equipped with an additional pulley, including there are two split pivot discs, and an endless wedge belt enveloping the pulleys located on the main shchik under the traction belt, and an axial movement of the drive forging wheels with a servo drive, the carrier comprising a housing and axes fixed to it for rollers. 2. The drive according to claim 1, characterized in that the axial movement of the pulley disks contains two crank-connecting rod mechanisms, the connecting rods of which are articulated with the shaft of the disks, and the shafts of the cranks are kinematically interconnected by a cylindrical gear transmission with a gear ratio equal to one, moreover, one of the shafts is connected to the servo drive via a worm gear. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 870330, cl. In 66 In 11/06, 1978 (prototype).