SU1449532A1 - Load limiter of hoisting mechanism - Google Patents

Abstract

FIELD OF THE INVENTION The invention relates to hoisting and transport machinery, load limiter. The purpose of the invention is to improve the accuracy of operation. The restrictor includes a housing 1 on which a rocker arm 3 is fixed by means of a hinge. In the housing there are movable guide rollers 4 and 5 with rods 6 and 7 placed on both sides of the hinge 2 at an unequal distance. An adjusting spring 10 rests against the shoulder of the rocker arm 3. The placement of the rollers 4 and 5 with the rods 6 and 7 on both sides of the hinge 2 reduces the force from the side of the rollers 4 and 5 relative to the hinge 2, that allows you to use the spring 10 with a slight rigidity, and consequently, with more accurate adjusting characteristics. 1 il. a (L 1O 4ib liU CD cl 00 to

Description

I The invention relates to a lift truck transport engineering, namely, a safety device BfeiM serving as a load limiting device.

 The purpose of the invention is to increase the accuracy of the operation. ; The drawing shows the limiter

general form.

The load limiter comprises a housing 1, on which a rocker arm 3 is fixed on the parent 2. Furthermore, the housing 1 contains a system of guide rollers consisting of three rollers. The rollers 4 and 5 are placed in the housing movably. Ro-J; HK 4 is connected with stem 6, and roller 5 (about rod 7. At ends of rods 6 and 7, rollers 8 are displaced. Rollers 4 and 5 are located on both sides of hinge 2. Central roller 9 jKtectKo is connected with rocker 3, the shoulder of which rests the adjusting pin 10 connected to the adjusting; -key 11} as well as the auxiliary ground 12 with the adjusting nut 13 On the body 1 there is an overload switch 14 and a weakening limit switch 15. On the yoke 3 contacts 16. Restrictive-5a 17 is fixed on the case 1. Limiter pa6oTaet cl riding

ebrazom.

: The restraint is fixedly attached to the metalwork of the lifting device 1. When lifting a load of weight P: the working rope, under the weight of the load, tends to assume a straight position. In this case, the rope acts through the roller 4 and the rod with the force P Р tgot on the beam 3 at a point remote from its mapimpa for the length LI. At the same time, the rope through the rod 5 and the rod 7 acts with the force P {1 P tgodi also on the yoke 3 at a point remote from its hinge at length LU, but from the other side of the hinge. Thus, two opposite moments M are received on the beam, P, L, and Mj Her L (,:, and since the angles L- and Li and the shoulders LI and L are not equal, the moments of forces also differ from each other. Unequal vertical moments give the difference in moments, which is The value that determines the sensitivity of the limiter.

0

five

The moment difference is perceived by the adjusting rod, located from the hinge of the rocker arm at a distance L}. Using the nut 11 force. the springs are set equal to P. with the condition of observance of the dependence P, Li - PgL.

Compliance with the dependence for 0 of a certain carrying capacity ensures the reduction of the limiter in the neutral position. The distance t "from the switch 14 to the contact 16 fixed on the rocker arm 3 is set by taking into account the excess load capacity after which the stopper should work.

When the weight of the lifted load is exceeded, the difference in the moments MI and M2 and, consequently, the rocker arm 3, compressing the spring 10, begins to turn on the hinge 2, the contact 16 approaches the switch 14 but does not touch it until the load weight exceeds permissible.

When this value is exceeded, the contact 16 presses the switch 14 and the load-lifting drive is switched off (formula

Lifting limiter of a lifting mechanism, comprising a housing with an unequal-armed spring-loaded rocker arm hinged on it by an axis, rigidly mounted on the housing and included in the lift drive control circuit limit switches with movable elements mounted with one arm in case of crane overload and the other, when the cargo rope is weakening, and two cable-guide rollers mounted in the hull, one of which is connected with the axis of rotation The other has a rod located in the body cavity with the possibility of interaction, VIYa with a smaller arm of the rocker arm at 50 crane overload, characterized in that, in order to improve the accuracy of operation, it is equipped with an additional cable-guiding roller with a rod, placed in the cavity 55 of the body with the possibility of interaction with the large arm of the crust when the crane is overloaded, and the first roller is fixed on the rocker arm.

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Claims (1)

SUMMARY OF THE INVENTION Load limiter • of a lifting mechanism, comprising a housing with a pivotally attached to it via an axis 35 spring-loaded rocker arm, rigidly fixed to the housing and included in the control circuit of the hoist drive, limit switches with movable elements mounted with the power of the interaction of one of them with the arm of the rocker arm when the crane is overloaded, and the other when glorifying the cargo rope, and two are installed in the housing rope guides of the roller, one of which is rigidly connected to the axis of rotation, and the other has a rod located in the body cavity with the possibility of interaction with the smaller arm of the rocker arm when the crane is overloaded, o lichayusch and I th with the fact that, in order to improve the accuracy of operation, it is equipped with an additional kanatonapravlyayuschim roller with a rod placed in 55 cavity body with the possibility of interaction with the large arm of the beam when the crane is overloaded, and the first roller is mounted on the beam.