CN201224673Y - Double brake electric hoist - Google Patents

Abstract

The utility model discloses a double-brake electric hoist, relating to a brake which is intended to provide a double-brake electric hoist that has long service life and performs brake function only when the first brake is faulted or other faults occur. The utility model adopts technical proposal that: 1. the double-brake electric hoist comprises a second brake, wherein the second brake is provided with a brake wheel and a brake arm, the brake arm includes two arc-shaped plates, the upper end of the brake arm is provided with a hole rotatably matched with the pin shaft supported on the brake cover plate, a rotary block is provided between the lower end faces of the brake arm, one end of the rotary shaft supported in the hole of the brake cover plate is connected with the side face of the rotary block, the upper end of a swing plate is connected with the rotary shaft, the lower end of the swing plate is hinged with one end of a pull rod, the other end of the pull rod is opposite to an electromagnet, both ends of a spring are respectively connected with the two arc-shaped plates, the electromagnet is electrically connected with a speed-exceeding switch arranged at the shaft fixedly connected with the brake wheel. The utility model is suitable for electric hoist.

Description

A kind of double-brake electric hoist

Technical field:

The utility model relates to a kind of drg, particularly a kind of double-brake electric hoist.

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 double-brake electric hoist of brake action at first brake failure or when other faults take place.The technical solution of the utility model is, a kind of double-brake electric hoist, 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, the two ends of spring are connected with two arcs respectively, electromagnet is electrically connected with the overspeed switch that is located at the axle place that is connected with brake wheel, electromagnet is fixed on the stay bearing plate of second drg, and brake wheel is fixed on the high speed shaft of change-speed box, be fixed on the slow-speed shaft of change-speed box, be fixed on the end face of reel one end or be fixed on the circumference of reel; Overspeed switch is located on the slow-speed shaft of change-speed box, be located on the high speed shaft of change-speed box, be located at the side that reel was gone up or be located to axle that reel one end stretches out outward.The utility model is owing to second drg that has adopted a kind of brake structure open in usual, 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 double-brake electric hoist, and Fig. 2 is the second drg front view of double-brake electric hoist, 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 to change mutually with the bearing pin 3 that is fixed on the second drg cover plate 1 to join, 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 7 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 14 of the utility model second is not worked, and when breaking down,, can not brake first drg when carrying out glancing impact, only when first brake failure, reel 13 freely rotates when rotating speed reaches dangerous rotating speed, the overspeed switch 11 that is located at the slow speed of revolution axle 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.At this moment, can make the slow safe falling of weight by the artificial control of the electrical equipment control principle second drg folding.The a kind of of brake wheel 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, be connected (referring to Fig. 3) this moment overspeed switch of the axle that this brake wheel and reel stretch out outward is located at the axle place that reel stretches out outward, the former lock torque is less, promptly can brake with less lock torque, 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.Electromagnet is fixed on the stay bearing plate of second drg, and brake wheel is fixed on the high speed shaft of change-speed box, perhaps is fixed on the slow-speed shaft of change-speed box, also can also be fixed on the circumference of reel on the end face that is fixed on reel one end; Overspeed switch is located on the slow-speed shaft of change-speed box, be located on the high speed shaft of change-speed box, be located at the side that reel was gone up or be located to axle that reel one end stretches out outward.

Claims (1)

1, a kind of double-brake electric hoist, 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, the two ends of spring are connected with two arcs respectively, electromagnet is electrically connected with the overspeed switch that is located at the axle place that is connected with brake wheel, electromagnet is fixed on the stay bearing plate of second drg, and brake wheel is fixed on the high speed shaft of change-speed box, be fixed on the slow-speed shaft of change-speed box, be fixed on the end face of reel one end or be fixed on the circumference of reel; Overspeed switch is located on the slow-speed shaft of change-speed box, be located on the high speed shaft of change-speed box, be located at the side that reel was gone up or be located to axle that reel one end stretches out outward.

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