SU1335527A1 - Safety device for toothed=rack hoist - Google Patents

Abstract

FIELD OF THE INVENTION The invention relates to a hoisting and transport machinery, devices for emergency braking of a rack-and-pinion elevator. The purpose of the invention is to unify the device by optimizing the braking mode, as well as simplifying the setting. The brake disk 6 is rigidly connected to the drive shaft 2 of the speed limiter 1. The case of the speed limiter 1 is made in the form of a gear wheel 7. Aligned with the speed limiter 1 is a disk brake, the pressure disks 8 and 9 of which are interconnected by means of axles 10, each of which is equipped with a threaded head 1 and a satellite gear 12 that meshes with a gear wheel 7. Between the head 11 and the satellite gear 12 is placed an elastic element 13, preloaded with the help of straps 15, the length of which is adjustable with using nuts 16. When speed limiter 1 is triggered, its housing in the form of a gear wheel 7 begins to rotate and transmit the gear to the m-satellites 12. At the same time, the heads 11 are screwed onto the threaded ends of the axles 10, compressing the elastic elements 13, which transfer force to the pressure disks 8 and 9, which brake the disc 6, as a result of which the elevator car stops. 5 il. S cl from 00 ate O1 th 15 16

Description

The invention relates to a subsurface transport machine-building industry, in particular, to devices for an emergency stop of a rack-and-pinion elevator cab.

The purpose of the invention is to deplete the unification of the safety device by optimizing the braking mode, as well as to ensure ease of adjustment.

FIG. 1 shows the device section; in fig. 2 is a view A of FIG. one; in fig. 3 - view B in fig .; in fig. 4 shows a section B-B in FIG. 2; in fig. 5 is a graph of the change in the braking torque as a function of the braking path S (A is the work, perfect with the safety device when braking) developed by this device.

The safety device contains a centrifugal speed limiter 1, the drive shaft 2 of which is mounted in the housing 3 and is equipped with a gear 4 which is engaged with the toothed rack 5. The brake disc 6 is rigidly connected to the drive shaft 2 of the speed limiter 1, the body of which is in the form of a gear wheels 7. A pressure disk 8 fixedly attached to the housing 3 and the pressure disk 9 are connected to each other by means of axles 10, which are penetrated into the holes o equidistant from the rotation axis of the drive shaft 2. The axes 10 have threaded ends on which heads 11 are rotated. Each axle 10 is loosely fitted with a gear-satellite 12, which is in engagement with a gear wheel m 7. The gear-satellite 12 has studs b, and the head I has slots corresponding to them, but allowing them to mutually axial movement. Between the heads 11 and the corresponding gears of the satellite-satellites 12 times. Resilient elements 13. A limit switch 14 is mounted fixedly relative to the housing 3, the pusher of which interacts with a recess r made in the end surface of the gear wheel 7. V gear x The satellites 12 and the corresponding heads 11 are made with coaxial holes, into which are not threaded the straps 15, the length of which is adjusted by the nuts 16, while preloading the elastic elements 13 is carried out. Between the pressure disks 8 and 9 are installed Military springs 17, and in the heads 11, holes 18 are made for a special key with which the device is released.

The safety device operates as follows.

When the elevator moves, the drive gear 4 interacts with the toothed rack 5 and rotates the centrifugal speed limiter 1 and the brake disk 6, while the gear wheel 7 is stationary. When the po.a is exceeded, the limiter 1 is triggered by the allowable speed ram

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the speeds and its casing in the form of a gear wheel 7 is driven into rotation, and the gears-satellites 12 begin to rotate. As the latter are connected to the heads 11, they also begin to rotate and screw onto the threaded ends of the axes 10, the gear-satellites 12 abut The pressure disk 9 moves it up to the contact with the brake disk 6 and, selecting gaps, press it to the pressure disk 8 of the housing 3. At the same time, the distance between the heads 11 and the corresponding gears and the satellite satellites 12 does not change. The pre-compression force of the elastic elements 13 remains equal to that established during assembly of the device. Upon further rotation of the gears-satellites 12, compression of the already pre-compressed elastic elements 13 occurs, which transfer force to the brake disk 6 until the lift completely stops.

To remove the braking force in the threaded heads 11, holes 18 are made under a special key. Inserting the key into the holes 18 of one of the heads 11 and screwing on the satellite gear 12 transfers the rotation through the gear wheel 7 to the remaining gear-satellites, thereby loosening the pressure of the pressure disk 9 against the casing 3 until the braking torque is completely removed.

The proposed safety device has the braking torque characteristic shown in FIG. 5, moreover, depending on the operating conditions and load capacity of this lift, by adjusting the preload of the springs 13 with nuts 16, you can choose the initial braking torque (M n, h) corresponding to the optimum energy performance of the unit, at the same time not exceeding the allowable dynamic loads on a lift, i.e. this device can be installed on a number of lifts of various capacities.

Claims (1)

Invention Formula A crawler hoist gearbox device containing a centrifugal speed limiter, the drive shaft of which is equipped with gear wheel j that is in engagement with the toothed rack, and a disc brake, whose pressure discs are interconnected by means of axles 50 passed through holes made in these discs and equidistant from the axis of rotation of the drive gear, each axis having a threaded end and equipped with a satellite gear meshing with a gear wheel aligned with the drive gear, and prugim ele.mentom, characterized in that, in order to achieve uniformity of the device by optimizing the braking state, as well as ease of 55 settings, each axis is provided with a head screwed onto the threaded end, whereby the gear-satellite sits on the axis freely and is connected to this head by Adjustable length, and the elastic element is placed between the head and the satellite gear with the possibility of pre-compression. Vida /five 13 FIG. J FIG. 5