SU1643393A2 - Device for checking tension of flexible hauling member of hoist - Google Patents

Abstract

The invention relates to hoisting machinery, in particular, to a device for monitoring the tension of a flexible traction body of a hoist. The purpose of the invention is to increase reliability. The device contains a cable-guide (CS) 1 and an intermediate (PS) 2 pulleys in contact with a flexible cable body. Pulleys 1 and 2 are kinematically connected to each other with cables (T) 11 wound on drums (B) 9 and 10, and the ratio of the diameters of the pulleys and drums D1: D2 to D10: D9 is observed. There are also ha 14 with freely rotating rollers (P) 15 and 16, covered by the leading branches of T 11. The rotation from KS 1 is transmitted through the flexible cable body PN 2. At the same time, T 11 is rewound to B 9 and 10. slippage of the traction body 4 along the KSH 1, the speed of the PSH 2 decreases, as a result of T 11, the PSH 2 pulls into the KSH 1; T ha 4 with P 15 and 16 ensures the equality of tension forces in T 11, which prevents a possible bias of the PN 2 when it is displaced in the direction to the KSH 1 2 Il. Type A

Description

The invention relates to an overhead transport engineering, in particular, to devices for controlling the tension of a flexible traction body of an elevator, and is an improvement of the device according to author. No. 1281492.

The purpose of the invention is to increase reliability in operation.

Figure 1 shows the device, a general view; 2 is a view A of FIG. 1.

The device contains a can drive and 1, an intermediate 2 pulleys and a bypass roller 3 in contact with the pull body 4. The pulley 2 is equipped with guides 5 in which the supports 6 of the shaft 7 of the pulley 2 are movably mounted.

Pulleys 1 and 2 are fixedly mounted respectively on shafts 8 and 7, on the ends of which the drums 9 and 10 are fixed, respectively, interconnected by means of two cables 11, covering these drums in several turns,

The diameters of pulleys 1 and 2, as well as the reels 10 and 9, satisfy the equality: D1: D2 D10: D9, where D1, D2, D9, D10 are the diameters of pulleys 1 and 2, respectively, and the reels 9 and 10. If this condition is observed, the points of the cable 11 are equal to each other (with normal, i.e., without slipping, the lift operation).

The device is equipped with blocks 12 mounted for rotation on a fixed axis 13. Cables t1 also cover blocks 12.

In addition, the device has a mechanism for leveling the forces in the leading branches of the cables 11. It is made in the form of a pull rod 14, at the ends of which free-running rollers 15 and 16 are mounted. The guide shells 17 are fixed so that the distance between them is clear. equal to the diameter of the rollers 15 (or 16). This provides the girth of the rollers 15 and 16 with cables 11 with an angle of 180 °, i.e. parallelism of the cable branches between the blocks 17 and the rollers 15 (16) in any position of the cable 14. Thus, the endlessly closed cable 11 covers in series the drum 10, block 17, roller 15 (16), block 17 again, then byraban 9, block 12 and returns to drum 10.

The device works as follows.

Rotation from the traction sheave 1 and the shaft 8 is transmitted by the drum 10, which is wound onto itself cables 11. The body 4 moved by the pulley 1 rotates the intermediate pulley 2, and hence the shaft 7 with the drums 9. Due to the equal speed of the drums 10 and 9 all

the points of the cables 11 have the same speeds and the latter are continuously rewound by the reels 9 and 10 and the blocks 12 without causing displacement of the intermediate pulley 2.

When the tension of the tug body 4 is weakened (due to its stretching), it begins to slip along pulley 1, its average speed decreases, and therefore the angular velocity of pulley 2 and drums decreases.

9. The circumferential speed of the latter becomes less than the circumferential speed of the drums 10, therefore, the cables 11 are wound onto the drums 10 faster than unwinding from the drums 9. This leads to the fact that the pulley

2 begins to shift in the guides 5 towards the pulley 1 due to shortening the upper branch of the cable located between the drums 10 and 9, which causes tension of the pulling member 4. The process continues until the pulling of slipper 4 disappears along the pulley 1. At that, the cable 11 does not sag, since the distance between the pulley shaft 8 .1 and the axis 13 of the blocks 12 does not change.

Introduced into the device mechanism (t ha

14 with rollers 15 and 16) ensures a strict equality of tension forces in both cables 11 (in their leading branches x). If, for example, for some reason, one of the cables 11,

for example, the left one (Fig. 2) will pull more than the right one, then a greater force will act on the roller 15 than the roller 16. As a result, the ton of 14 will be displaced towards the larger

of them, i.e. in the direction of the left cable 11. This will cause a weakening of the tension of the left (Fig. 2) cable 11 and an increase in the tension of the right cable 11: The process occurs before the forces are equalized in both cables 11, after

which t ha 14 will again become fixed.

Ensuring a constant equality of effort in the cables 11 makes it possible to create a symmetrical load acting on the intermediate pulley 2, which is known

eliminates its possible bias when moving in the guides 5 (when the tension of the traction body 4 loosens).

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Claims (1)

Invention Formula A device for monitoring the tension of a flexible traction body of the lift according to the autor. No. 1281492, characterized in that, in order to increase reliability in operation, it is equipped with a force leveling mechanism installed between the drums in the leading branches of both cables, including a rigid rod with two freely rotating rollers mounted at its ends, which bend around leading branches of the cables on the side facing the motor, and bypass rollers, the angle The circumference of the freely rotating rollers by the branches of the cables is at least 180 °. ,eight  Have 17G 1