SU1234346A1 - Crane load-carrying capacity limiter - Google Patents

Description

This invention relates to crane safety devices and is intended for use as a load limiter.

The purpose of the invention is to improve the accuracy of the load limiter.

Figure 1 shows the load limiter, a general view; in fig. .2 - the same, plan view.

The cranes loading limiter contains a block 1, which is enveloped by a rope 2, Block 1 is installed through-. The bearing 3 on the eccentric axis 4 mounted in bearings on two rolling bearings 5 and 6 and connected with the lever 7, In the latter, an oblong hole 8 is made, in which the axis 9 is mounted,

On axis 9, a counterweight 10 is suspended, supported on support P, Lever 7 is provided with a ruler 12, which acts on switches 13 (with a nominal hook load, tension of the pull rod acts on block 1, then is transmitted to the eccentric axis 4 and creates a moment relative to the reference supporting 5, which balances the moment of the weight of the lever 7 and J5 of the counterweight 10, As the tension of the ropes increases, the moment of the load increases. When the moment of the load from the load reaches the maximum permissible value, the lever 7 raises the counterweight 10 from support 1 1 and -12 line means depresses the switch 1 overdrive thereby turning off the drive of the lifting mechanism. When umenschenii load and reaching a torque of the load miniregruza) and 14 (attenuation). On the outer rings of rolling bearings 5 of the maximum allowable size, the lever 7 of the bevel gear is lowered, presses the switch 15, mounted by bearings 6 in the supports 16,

14 loosen and turn off the lifting mechanism drive.

The gears 15 are kinematically connected through a system of bevel gears 17 and a chain drive 18 with a drive of a load drum or with an independent drive (not shown) in such a way that the direction of rotation of the bevel gears 17 is mutually opposite.

The load limiter works as follows.

At the nominal hook load, the tension of the traction device acts on the block 1, then it is transferred to the eccentric axis 4 and creates a moment relative to the supporting support 5, which is balanced by the moment of the weight of the lever 7 and the counterweight 10, when the tension of the ropes increases is increasing. Upon reaching the maximum permissible value from the load, the lever 7 raises the counterweight 10 from the support 1 1 and, using a ruler -12, presses the overload switch 13, thereby disconnecting the drive of the lifting mechanism. When reducing the load and reaching the moment from the load mini

The minimum allowable value of the lever 7 is lowered, presses the switch

The minimum allowable value of the lever 7 is lowered, presses the switch

14 loosen and turn off the lifting mechanism drive.

Due to the constant rotation of the thrust bearings 5 of the eccentric axis 4, the resting friction moment will be significantly reduced.

L 77

fig 2

Compiled by A, Mapkov Editor B, Kovtun TehredO.Gortvay Proofreader.

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VNIIPI USSR State Committee for Inventions and Discoveries 113035, Moscow, Zh-35, Raushsk nab ,, d.4 / 5

Production and printing company, Uzhgorod, Proektna st, 4

Claims (1)

CRANE CAPACITY RESTRICTOR, comprising an enveloped, rope-mounted unit mounted by bearings on an eccentric axis connected to a lever c. a load for interacting with the limit switch, and bearings with two rolling bearings, characterized in that, in order to improve the accuracy of the limiter, the bearings are equipped with additional bearings located in the said bearings of the rolling bearings and mounted on an eccentric axis, in each support between these bearings mounted gears made with the possibility of forced rotation in mutually opposite directions. B GO GO Fig.]