SU1463709A1 - Boom crane load limiter - Google Patents

Abstract

This invention relates to a lifting and transport machinery. The purpose of the invention is to increase the serviceability of the limiter. The boom crane's load limiter contains a drum mounted on the crane boom and connected by a flexible body with a moving boom section, a spatial cam connected to the screw drive drum, and an electromechanical converter in the form of a potentiometer with a brush that interacts with the platform-lever mechanism. with a spatial cam by means of a spring-loaded lever, a force sensor, a leash mounted on a shaft, brushes and connected to the lever by means of an adjustable rod Moreover, the lead is connected to the shaft of the potentiometer brush by means of a threaded connection. 4 il. i (L

Description

one

The invention relates to lifting and transport machinery, in particular, to the lifting capacity of cranes.

The purpose of the invention is to increase the serviceability of the limiter.

FIG. 1.The location shown is the load limiter on the crane; in fig. 2 is a section A-A in FIG. one; in fig. 3 is a view B in FIG. 2; in fig. 4 is a B-jB section in FIG. 3

The load-carrying capacity limiter is kra-na: with a telescopic boom contains a sensor force sensor (not shown), a cam actuator 1 (Fig. 1) with an electromechanical transducer 2 mounted on the base of the boom 3.

The boom length is entered into the cam drive 1 by the ropes 4, and the boom angle is entered by the 5, installed 5, on the levers 6 and 7 with the help of hinged bearings 8 (Fig. 2). . The lever 7 (FIG. 1) is mounted on a turn platform 9.

The cam actuator 1 includes a drum 10 (Fig. 2) connected to a shaft 11, on the threaded part of which a nut 12 is mounted, which carries on a leash 13, which is included in the cut of sleeve 14 of the cam 15.

The sleeve 14 is mounted on the shaft 16, having a long keyway L 7. The shaft 16 is rigidly mounted gear 18, coupled with the sector 19, on the shaft 20 of which is mounted a lever 6.

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The spatial cam 15 sec along the arm of a lever transmission is connected with a brush 21 (Fig. 3) moving through the potentiometer 22 of the electromechanical transducer 2.

A lever 23 enters the lever gear, on one shoulder 24 of which a probe 25 (ball) is installed, which rests against the surface of cam 15, a spring 26 is connected to the other shoulder, and the third is regulated by a cable 27, the other end of which is connected to an additional driver 28 screwed into the brush roller 21. The brush 21 is set to its initial position (lower position in FIG. 3) by changing the length of the threaded rod 27 when the probe 25 is set to the minimum radius of the cam 15. The brush 21 is moved to the upper position by changing the length of the driver 28 when installed ke probe 25 at the maximum radius of the cam 15.

The limiter works as follows.

When the boom section rises, the drum 10, shaft 11 rotates, which causes the nut 12 to move, which through the lead 13 moves the sleeve 14 with the cam 15. When the angle of the boom changes, the lever 6 rotates, which causes the sector 19, pinion 18 and cam to rotate 15.

Moving the cam 15 when the boom sections are moving and turning it when the boom angle changes, causes the three shoulders to turn 23, which through adjustable pull 27, the leash 28 causes the brush 21 to move across the potentiometer 22. The signal that the potentiometer 22 corresponds to the weight, which the crane can lift at a specific position of the boom in the angle and in length, and the signal given by the force sensor, cooTBTCTBjifT, increases the weight. Comparison of these signals is performed in a resolver (not shown).

Claims (1)

Invention Formula A boom crane's load limiter containing a spatial cam placed on the base of the boom and connected via a screw gear to a drum connected by a flexible member to the moving boom section, and through a lever mechanism to a turntable connected to the boom base and included in the control circuit crane lifting mechanism; A variable resistor with a movable contact mounted on an axis and installed with the possibility of interaction with a spatial cam, is different. In order to improve accuracy, the movable contact is installed with the ability to interact with the cam by means of a hinged-lever system having a spring-loaded lever in contact with the cam, a pull of adjustable length, connected at one end with a sub-lever, and a lead connected to the other end of the rod and installed with the possibility of radial movement from The axis of the moving contact. Editor V. Bugrenkova Fig Make up-gel I. Kiriyenko Tehred A. Kravchuk Proofreader V. Romanenko