RU1483831C - Hoist automatic brake - Google Patents

Description

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The invention relates to mechanical engineering and may find application in load-lifting devices of reloading machines, especially with adjustable speed of lifting and lowering, for nuclear reactors

The purpose of the invention is to increase the reliability of the brake.

In FIG. 1 shows the proposed brake, a longitudinal section; in FIG. 2 is a section AA in FIG. 1, but FIG. 3 is a section G G in FIG. 1, in FIG. 4 is a section bb in FIG. 1.

The brake comprises a brake drum 1, which is simultaneously a sleeve of a freewheel clutch 2 with two rows of rollers 3 and in the housing 4 of which ribs 5 are located on the outer surface of the drum, mounted on the shaft 6 on the sleeve 7, the leading coupling half 8 is stationary on the key 9 of the drive gear 10, the driven coupling half 11 mounted fixedly on the key 12 on the shaft 6, which is supported by the bearings 13 of the housing A, the coupling half 11 is pivotally connected to the brake pads 15c by the friction elements 16 with the fingers 14. Fingers 17 are equipped with fingers 17, which interact with the slots of the control disk 18 located on the coupling half 8. The coupling halves 8 and 11 have cams 19 and 20, respectively. Between the pads 15 and the coupling half 11, expansion springs 21 are installed. The drum 1 is mounted on the coupling half 8 on two bearings 22. To prevent oil from entering the friction elements 16 in the brake, the cuffs 23, 24 and 25 are installed on the shaft 6, cuffs 23, 24 and 25, respectively ,

The brake operates as follows.

When lifting the load (the rotation of the leading coupling half 8 should be in the direction of the arrow (in Fig. 2-4), the rotation from the driving coupling half 8 is transmitted through the cams 19 and 20 to the coupling half 11 and then through the key 12 to the shaft 6. However, the fingers 17 do not interact with curly cutouts of the disk 18 (see Fig. 3), therefore, the pads 15 are pressed by springs 21 to the drum 1, which, together with the freewheel sleeve 2 and the rollers 3, rotates freely relative to the housing 4. When the drive is driven off, the coupling half 11 located under the action of torque from the load, tends to turn the bar en in the opposite direction, however, due to small dead move the overrunning clutch rollers 3 stopper sleeve 2 m it together with the drum 1 relative to the housing 4. The fins drum 1 during its rotation and lifting cargo provides intense cooling of the brake

When lowering the elevator without load (it is assumed that the momentum from the weight of the moved

coupling half 11 is not transmitted)

the disk 18, rotating from the drive, interacts with the fingers 17 through its slots, squeezing the brake pads 15 from the inner surface of the drum 1 In this case, the rotation of the drum 1 relative to the housing 4 excludes the freewheel. With further rotation, the cams 19 interact with the cams 20, through which the torque from the drive is transmitted to the coupling half 11, when the latter rotates

lowering the lift without load. At the entire height of lowering the elevator without load, when the drive is switched on, the pads 15 are in the depressed position. After turning off the drive, the brake closes,

since the pads 15 are pressed by the springs 21 against the inner surface of the drum 1.

When lowering the load (rotation of the drive coupling half 8 should be opposite the arrow in Fig. 2-4), the control disk 18 rotates under the action of the drive torque, interacts with the palm trees 17 and squeezes the pads 15 from the inner surface of the drum 1, the rotation of the drum 1 relative to the housing 4 is prevented by the overrunning clutch, since its rollers 3 are in a jammed position, and the driven half-clutch 11, pivotally connected to the brake pads 15, is under the influence of the torque from the lower load.

As the pads 15 are pressed away from the inner surface of the brake drum 1, the braking torque decreases and when the value is less than the torque value from the lower load, the load begins to lower with some acceleration, the coupling half 11 also rotates with acceleration. As soon as the rotation speed of the coupling half 11 exceeds the control rotation speed the disk 18, the interaction of its slots with the fingers 17 stops, the pads

15 are pressed against the inner surface of the drum 1, the braking torque is increased, and the rotation speed of the coupling half 11 and the lowering speed of the load are reduced. When the coupling half 11 reaches a rotation speed lower than the rotation speed of the control disk 18, its slots again interact with the fingers 17, pressing the pads 15 from the inner surface of the drum 1, while reducing the braking torque. The load begins to descend with accelerator 514838316

In this case, the braking process is repeated (56) USSR author's certificate again. 470487. cl. In 66 D 5/02, 1972.

FORMULA AND SECTION

An automatic brake for hoisting mechanisms, comprising a housing inside which a shaft is mounted with a sleeve mounted on it and with a drive and driven coupling half aligned thereon, as well as spring-loaded brake pads mounted pivotally on the driven coupling half and kinematically coupled to a release device, characterized in that, in order to increase reliability, it is equipped with a brake drum with a freewheel mounted on it, with a squeezing device located inside it, made in the form of a fixed On the leading half-clutch of the leveling disc with slots and the fingers that are hard-pressed on the pads, the brake bar is updated with the help of the freewheel. It can be rotated to lift the load and is rigidly connected to the core when lowering the load, wherein the springs of the brain pads are made expandable and are placed in the bores of the driven field.

made in the form of a control disk rigidly fixed on the leading coupling half with slots and fingers arranged in them with the possibility of interaction, rigidly fixed on the pads, the brake drum is installed with the help of a freewheel. It can be rotated when lifting the load and rigidly connected is engaged with the housing when lowering the load, while the brake pad springs are expandable and placed in the bores of the driven coupling half.

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