CN2389254Y

CN2389254Y - Block brake

Info

Publication number: CN2389254Y
Application number: CN 99242288
Authority: CN
Inventors: 张家政; 陈铁山
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-09-17
Filing date: 1999-09-17
Publication date: 2000-07-26
Anticipated expiration: 2009-09-17

Abstract

The utility model relates to a structural design for a novel block brake. A friction limited device which is composed of a slide shaft, a friction head, a pressure spring and a limited screw is added between a brake shoe and a brake arm plate, and the brake shoe is exerted simultaneously with the frictional force which has basic balancing for limiting when the brake shoe is rotated freely. The generation for the vicious circle of the brake shoe after the brake shoe is abraded to deviate is prevented, an unexpected accident which caused by loosening a brake shoe shaft is prevented, and the utility model has obvious function for the stable and safe operation of the block brake.

Description

Novel block brake

The utility model belongs to a kind of mechanical brake equipment, is specially adapted to the braking that forces to running shaft.

With various winchs, elevating mechanism or the block brake in the braking device of forcing that matches in similar operation is the equipment that often adopts.Existing block brake has been listed NBS or ministry standard series in, the basic structure that is adopted is a base, be arranged on the base and and be two brake arms that hinge type is connected with base, tile fragment formula brake shoe is arranged between two arm plates of brake arm and is hinge type and connects, and the circular space between two brake shoes is the brake rim that is connected with rotary main shaft.In the upper end of brake arm is the spring brake rod.When brake rod spurs under the magnetic driver effect, two brake arms are drawn close when tightening up, two brake shoe automatic wrappings form and force braking on the braking rim.In above structure since two brake shoes only by the adjustment nut location at bearing pin and two ends, make the gap between brake shoe and the rim produce bigger deviation so in application, cause the abrasion of nut loosening or brake shoe along with vibrations, make that impacting stopping power weakens greatly, and cause vicious circle.Excessive mill partially or the nut loosening in using also can cause than major break down.That is to say that this device has been faced with the stage that non-change because of arbitrarily adjusting the bad above great defective that forms with one heart.

The purpose of this utility model promptly provides a kind of structural design of novel block brake, the additional device that attempt utilization newly increases improves the centering performance at random of two brake shoes, overcome the inclined to one side defective of mill of bowing that easily causes brake shoe simultaneously, improve the safe operating life of brake shoe.

Crucial design of the present utility model is to solve the contradiction that tile fragment formula brake shoe is connected with the brake arm hinge.Be to connect keeping the rotary freedom of brake shoe in the original device, thereby the self-alignment of brake shoe and rim when making each braking realize the good braking that forces by hinge type.For prevent the brake shoe rotary freedom excessive flexible automatic bow, grind cause vicious circle partially, just rely on the fastening formation frictional force of nut at hinge axis two ends to be limited.Like this, frictional force is too big, and then self-alignment is bad, and period of braking is elongated, and is undesirable.Nut is too loose then to be difficult for working.And various fortuitous events can't be guaranteed also that nut is fastening and remain on rational state in the practical operation, so contradiction is difficult for solving, and serious accident happens occasionally.So the utility model has just designed a spacing additional device of special friction especially, make and increase the flexibility ratio that rotates freely that an additional friction power limits brake shoe between two arm plates of brake shoe and brake arm, make it can keep the relative position state of brake shoe and rim behind each skidding at any time, thereby improved the effect of each braking greatly, prevented that again the brake shoe that transition causes flexibly from becoming flexible the generation that inclined to one side and all kinds of serious accidents are ground in sagging generation.

Below in conjunction with the embodiment that accompanying drawing provides, further specify goal of the invention of the present utility model and realize as protecting: wherein Fig. 1 is a structural representation of the present utility model.

Fig. 2 is the right elevation of Fig. 1.

Fig. 3 is the structural representation of additional friction device.

Wherein 1 is base, and 2 is hinge axis, and 3 is brake arm, and 3A is the brake arm plate, 4 is brake shoe, and 4A is a brake block, and 4B is a watt rib, 4C is a stiffening rib, and 4D is additional muscle, and 4DA is a pilot hole, 5 are the friction limit stoper, and 5A is a sliding axle, and 5B is a friction head, 5C is a pressing spring, and 5D is a set screw, and 6 is parallel position-limiting tube, 6A fixes 6 pin bolt, and 7 is rim, and 8 is spring formula brake rod.

Provided the embodiment of friction limit stoper in the accompanying drawing, can do in axial sliding friction head 5B along sliding axle, be located at two pressing spring 5C and two limited screw 5D between the friction head 5B and form by sliding axle 5A, two in the concrete structure.The friction head 5B that assembles like this can outwards move along sliding axle under the effect of pressing spring 5C, locatees until the effect that is subjected to limited screw.If being arranged between two arm plates of brake arm, such device will produce corresponding friction position-limiting action, thereby, the utility model has added an additional gusset 4D especially on tile fragment formula brake shoe, on additional gusset 4D, pilot hole 4DA is set, like this friction positioning device 5 just can be arranged among the corresponding two pilot hole 4DA, and, two friction head 4B be pressed on the inner side surface of brake arm plate 3A by the strength of pressing spring 5C, thereby formation frictional force, the restriction brake shoe freely rotates.Like this after each brake, brake shoe is self-alignment, during disengaged position, although brake shoe still rotating shaft is very flexible, also because of the effect of friction head 5B makes brake shoe can be not sagging, basic gap parameter when guaranteeing obvolvent next time and impact cohesive force also just can be avoided rubbing and wait vicious circle to produce partially, thereby have improved the stability and the reliability of break greatly.

Because brake arm plate 1A is working surface not, for guaranteeing the interval unanimity between the two arm plates daytime, make friction position-limiting action power weighing apparatus fixed, between the special two arm plate 3A, close two-end part has up and down added two parallel position-limiting tubes 6, by length identical two position-limiting tubes 6 and pin bolt 6A, two arm plate 3A are limited up and down at interval, make the friction limit function of this device more reliable.

New Brake by above structure is made can realize random position and maintenance, disobeys actual condition and changes and influenced, and safety reliability increases, and increase working life, is the outstanding update product design of a kind of performance.

Claims

1, a kind of novel block brake, by base (1), be symmetricly set on that base (1) is gone up and be two brake arms (3) that hinge type is connected with base (1), be arranged between the brake arm two arm plates (3A) and be the tile fragment formula brake shoe (4) that hinge type connects and the spring formula brake rod (8) that is located at two brake arms (3) upper end is formed, it is characterized in that between brake shoe (4) and brake arm plate (3A), having set up a friction limit stoper (5).

2, according to the said block brake of claim 1, it is characterized in that rubbing limit stoper (5) by a sliding axle (5A), two be enclosed within the friction head (5B) that can slide vertically on the sliding axle, the pressing spring (5C) and the limited screw (5D) that are located between two friction heads are formed, be positioned at the additional muscle (4D) of brake shoe and go up in two symmetrical pilot holes (4DA) of preprocessing, spacing between brake arm plate (3A).

3, according to the said block brake of claim 1, it is characterized in that between (3) two arm plates of brake arm (3A), adding two parallel position-limiting tubes (6) up and down, this pipe lower-upper length is identical to be positioned between the two arm plates (3A) by pin bolt (6A).