CN201201881Y - Electric hoist - Google Patents

Abstract

The utility model discloses an electric hoist, which has long service life and can act brake function when the first brake fails in brake or has accidents, belonging to the brake technical field. The technical scheme of the utility model is characterized in that an electric hoist comprises a second brake provided with a brake wheel and a brake arm, wherein the brake arm adopts two arc plates which upper ends are provided with a hole rotationally fit with a pin on the brake cover plate and the end faces of the lower ends are provided with a rotary block therebetween, one end of a rotation shaft rotationally supported in the hole of the brake cover plate is connected with the side surface of the rotary block, the upper end of a swing plate is connected with the rotation shaft and the lower end is hinged with one end of a draw rod, the another end of the draw rod is opposite to an electromagnet, two ends of a spring are connected with the two arc plates, and the electromagnet is electrically connected with a speedometer switch arranged on the shaft fixed with the brake wheel. The utility model is used for electric hoists.

Description

A kind of electric block

Technical field:

The utility model relates to a kind of drg, particularly a kind of electric block.

Background technology:

In the lifting field, existing drg is the normally closed structure, and promptly drg packs tightly brake wheel when no power, and energising rear brake band-type brake unclamps operating unit work.In the dangerous work environment, hoisting crane or electric block are for safety, second drg is established in requirement, make second drg with existing normally closed brake, its drawback be switch on and the no power drg all in running order, thereby its service life will shorten, this drg can not play long-term safety effect.

Summary of the invention:

The purpose of this utility model provides a kind of long service life and only just plays the electric block of brake action at first brake failure or when other faults take place.The technical solution of the utility model is, a kind of electric block, include second drg, it is characterized in that: described second drg has brake wheel and brake control lever, brake control lever is two arcs, bearing pin commentaries on classics on there is a hole its upper end and is supported on the drg cover plate cooperates, one switch block is arranged between the end face of its lower end, an end that is supported on the rotating shaft in the brake cap plate hole connects the side of switch block therewith, the upper end of pendulum plate is connected with above-mentioned rotating shaft, and an end of its lower end and pull bar is hinged, and the other end of pull bar is relative with electromagnet, the two ends of spring are connected with two arcs respectively, and electromagnet is electrically connected with the velometer switch that is located at the axle place that is connected with brake wheel.Described brake wheel is the wheel that is connected mutually with the change-speed box high speed shaft.Described brake wheel is the wheel that is connected mutually with the reel inwall.Described brake control lever is made up of two arcs, and the upper end overlaid of these two arcs has a hole to change with bearing pin and cooperates at the center of lap, and an end and the drg cover plate of this bearing pin are connected.The utility model is owing to a kind of brake structure open in usual of employing, thereby the remarkable advantage that has long service life compared with the prior art.

Description of drawings:

Fig. 1 is the front view of the utility model electric block, and Fig. 2 is the second drg front view of electric block, and Fig. 3 is the A-A cutaway view of Fig. 2, and Fig. 4 is the another kind of structural representation of brake wheel.

The specific embodiment:

In conjunction with above accompanying drawing the utility model is elaborated, brake control lever 5 of the present utility model is made up of two arcs, the upper end of these two arcs respectively has a semicircle orifice and bearing pin 3 to match, one switch block is arranged between the end face of its lower end, one end of bearing pin 3 is connected with the cover plate of second drg, with the screw thread of nut two arcs are connected by bearing pin 3 another terminations, the two ends of two springs 4 are separately fixed on two arcs, the brake control lever 5 that combines places in the brake wheel 2, the another kind of structure of brake control lever is, the thickness of the overlapped part of one end of two arcs is half of arc body thickness, has a hole and bearing pin to change at the center of overlapping and joins.Switch block 6 places in the lower port of two arcs, and the sidepiece of switch block 7 has a rotating shaft 6 rotational support in the cover board hole of drg, and an end of pendulum plate 8 is connected with bearing pin, and an end of the other end and pull bar 10 is hinged, and the other end of this pull bar is relative with electromagnet 9.

Principle of the present utility model is, when electric block during in normal operation, the drg of the utility model second is not worked, and carrying out glancing impact when breaking down before first drg can not brake, only when first brake failure, reel freely rotates when rotating speed reaches dangerous rotating speed, the velometer switch 11 that is located at the high speed shaft place of change-speed box 12 is connected solenoid circuit, the suction of electromagnet makes the rotation of rotating shaft rotation certain angle drive switch block that brake control lever is opened the brake wheel locking, reel stops operating, and prevents the danger that electric block meets accident.Wanting brake wheel a kind of is the brake wheel (referring to Fig. 2) that is connected mutually with the high speed shaft of change-speed box; Another kind is the brake wheel 2 that is connected mutually with the inwall of reel 13, and the axle that this brake wheel and reel stretch out outward is connected (referring to Fig. 3), and the former lock torque is less, promptly can brake with less lock torque, and the latter has then saved change-speed box, and is simple in structure.Thereby second drg of the present utility model, can be implemented in first drg and carry out glancing impact, second drg does not participate in braking, only can not just brake by this drg of glancing impact at first brake failure, and therefore, the service life of this drg is longer.

Claims (4)

1, a kind of electric block, include second drg, it is characterized in that: described second drg has brake wheel and brake control lever, brake control lever is two arcs, bearing pin commentaries on classics on there is a hole its upper end and is supported on the drg cover plate cooperates, one switch block is arranged between the end face of its lower end, an end that is supported on the rotating shaft in the brake cap plate hole connects the side of switch block therewith, the upper end of pendulum plate is connected with above-mentioned rotating shaft, one end of its lower end and pull bar is hinged, the other end of pull bar is relative with electromagnet, and the two ends of spring are connected with two arcs respectively, and electromagnet is electrically connected with the velometer switch that is located at the axle place that is connected with brake wheel.

2, a kind of electric block as claimed in claim 1 is characterized in that: described brake wheel is the wheel that is connected mutually with the change-speed box high speed shaft.

3, a kind of electric block as claimed in claim 1 is characterized in that: described brake wheel is the wheel that is connected mutually with the reel inwall.

4, a kind of electric block as claimed in claim 1, it is characterized in that: described brake control lever is made up of two arcs, the upper end overlaid of these two arcs has a hole to change with bearing pin and cooperates at the center of lap, an end and the drg cover plate of this bearing pin are connected.

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