Brake

FIELD: mechanical engineering.

SUBSTANCE: brake comprises braking belt, mechanical drive, and braking pulley whose one flange is detachable and has hollow that receives central and two side sections with friction linings. The central section bears on the wavy spring. The side and central sections are in a contact with the double-sided wedge-shaped blocks for permitting radial movement of the section due to interaction of their sides with the wave springs. The periphery of the hollow is separated into sectors. Each of the sector receives the central section and two side sections spring-loaded by means of wavy springs of different rigidity. The spring that underlies the central section is magnetized. The inner conical surfaces of the flanges and surfaces of the sections that are in a contact with them are provided with radial hollows that receive the locking balls.

EFFECT: enhanced braking capabilities.

6 dwg

 

The invention relates to mechanical engineering and can be used in the tape-drum brakes drilling winches.

Famous band-Shoe brake, in which between the inner surface of the brake band and each outside surface of the friction lining mounted longitudinal plate fixed in the Central part of the strap through the reinforcing wire and the longitudinal plates are made with elasticity, increasing from the incident area of the tape to the cascading area [1, similar].

This design of the friction node brake has the disadvantage that the rolling and cascading branches of the brake bands are in constant dynamic coefficient of mutual overlap of friction pairs.

Known drum-type brake in which the buildings blocks are hollow in the form of a U-shaped cross-section with a flat bottom located therein bilateral wedge crackers, and the inner side of the Central and side sections, facing the bottom of the recess made in the form of wedge surfaces which are in contact with wedge crackers with the possibility of radial movement of the sections, and elastic elements made in the form of a wave spring disposed between the surfaces of the recesses, the breadcrumbs and the Central section [2, prototype].

This design frictional the site are not applicable to the installation on the perimeter of the brake pulley belt-plate brake in connection with the that it can only be installed in the recess with a flat bottom.

In comparison with analogue and prototype of the proposed brake has the following distinctive features:

- the possibility of surgical intervention in the process of implementing the braking torque due to the dynamic changes of the coefficient of mutual overlapping branches of the brake bands depending on the normal force acting on each working surface lining the Central section of the friction element, which allows to adjust the specific load on the branches of the tape, and each friction element;

- benefit in the effort of pressing the side sections by samostalni in the braking process, which is implemented through the use of double-sided V-crumbs;

- improved ethnocofessional properties opposite pairs of friction brakes due to the lack of intensive plastic deformation of their surfaces, leading to increase of the nominal and actual area of contact, and as a consequence contributing to the deterioration of the terms of friction; in addition, under equal conditions the friction force and the rate of wear at the opposite pairs less than direct;

- eliminates sharp capture of the brake band convex surfaces of the friction elements and, as a consequence, disappear shocks and vibrations of the friction pairs due to the presence of a Central s is the s wave springs as well as wave springs, supporting bilateral V-crumbs;

- eliminates uneven wear of the working surfaces of the linings of the friction elements is not only due to the continuous change their position relative to the rolling and cascading branches of the brake bands, but due to the redistribution of normal pressure load from the Central to the lateral sections.

The aim of the invention is to increase the efficiency of the belt drum brakes at the expense of the self in the process of braking and pressing the additional friction of the friction surfaces and, consequently, increase them total braking torque.

This objective is achieved in that the brake pulley recess made in the form of a dovetail with a cylindrical bearing surface, the perimeter of which is divided by jumpers on the n-th number of sectors, each of which are Central and two side sections, spring-loaded wave springs of different stiffness, and spring under the Central section is made of a magnetized, while the inner conical surfaces of the flanges and in contact with the surface of the side section of a radial recess in which is installed locking balls.

Figure 1 shows reunionagency band-Shoe brake; figure 2 - view And the friction node; figure 3 illustrates a longitudinal section through b-B of the friction node; figure 4 shows a wavy spring; figure 5 and 6 shows a diagram of forces in the interaction of the Central and side sections of the friction element with mating surfaces bilateral wedge of bread without and under load. Figure 5 and 6 used the following conventions: α1that α2and ρ1that ρ2- the angles of the bevels bilateral wedge of bread and angles of friction ρ1and ρ2which are rejected response Fr1Fr2and Fr1that′ Fr2′ under the action of friction forces that occur, respectively, with mating surfaces of the Central and side sections; NN is the normal to the surfaces of bilateral wedge rusk; Fb1Fb2- weight: half of the Central and full side section; F1F2and F1that′ F2′ - resistance to the moving half of the Central and full side sections of the friction element;- the elastic force wavy springs under the Central and lateral sections of the friction element; 0,5N1- normal load per half working surface lining the Central section of the friction element; FT- the friction force arising in a couple of "surface doctoron the th wedge of bread the abutment surface of the brake pulley"; P is the force required to move the bilateral wedge of bread.

Reunionagency band-Shoe brake includes a brake pulley 1, which has a cylindrical working surface 2. On the ends of the pulley 1 are of the flanges 3 and 4. The left flange 3 is made removable, and the right is the one with the pulley 1. The left flange 3 is attached to the body of the brake pulley 1 by means of fixing screws 5. Brake pulley 1 is mounted on the lifting shaft 6. In brake pulley 1 has a recess with which the inner surfaces of the flanges 3 and 4, with the cylindrical working surface of the pulley 1 and a part of the surface of the side sections 8 and 9, and part of the surface wave springs 15 and 16 forms a connection dovetail with the cylindrical working surface. In this deepening placed three working sections of the friction element: Central 7 and two side 8 and 9. From the side of the brake bands 19 section 7, 8 and 9 have a cylindrical surface to which is attached a friction lining 10. The Central section 7 is based on magnetized wave spring 17 is placed in the U-shaped recess section, and touches the side of the conical surfaces with maple crackers 13 and 14. The latter is also tapered surfaces in contact with the relevant konicek the mi surfaces of the side sections 8 and 9. The effect of two-way locking wedge crackers 13 and 14 is that they are held from longitudinal movement solely by friction against their bearing surfaces in engagement with adjacent surfaces of the Central 7 and the side 8, 9 sections of the friction element. This must be maintained condition

α1212,

i.e. the sum of the angle of the bevels crackers 13 and 14 should not be greater than their total friction angle.

Kinematic relationship two-way V-crackers 13 and 14 with a Central 7 and the side 8 and 9 sections is wave springs 15 and 16. When this wave springs 15, 16 and 17 are made with different stiffness.

To prevent falling out of the side sections 8 and 9 of the recesses of the pulley 1 under the action of gravitational and centrifugal forces in the area not covered by the brake band 18, the adjacent conical surfaces of the flanges 3, 4 and the side sections 8 and 9 are made of the recess 11, in which is installed locking balls 12. The Central section 7 prevents it from falling out of the recesses of the pulley 1 strength of the magnetic interactions that occur on the one hand between the outer surface of the wave spring 17 and its base, and on the other side - between its inner surface and the working surface of the brake pulley 1.

The working section of the friction element is installed around the perimeter of the brake pulley 1 in the n-th number of sectors that are restricted to the ridges 24. The outer surface of the friction lining 10 grabs brake band 18, cascading branch 20 which is fastened by means of screw rods 21 to the support 22. When this incident branch 19 of the brake belt 18 is attached to the control lever 23. The friction pair "convex surface of the friction lining 10 Central 7 and sides 8 and 9 sections (index 1) to the inner surface of the brake bands 18 (index 2)are opposite pairs of friction. For a given pair of friction the following conditions are met location of the materials of the friction pairs: H2>H1(hardness) and aH1>AndH2(square surfaces touch).

Reunionagency band-Shoe brake operates as follows.

When pressing on the lever 23 of the brake band 18 of their 19 incident and ran 20 branches begins to interact with the external surfaces of the friction lining 10 of the Central section 7 of the friction element. Thus, the force of friction under the oncoming 19 and 20 branches cascading brake belt 18 will be different, because the true condition that SH≥SC(where SHand SCthe tension rolling and cascading branches of the brake bands). When this dynamic coefficient is ecient overlap of friction pairs will be the same as under the oncoming 19, and under cascading 20 branches of the brake bands 18, but will be different radial movement of the Central sections 7 of the friction elements under the action of different normal forces. Moving the Central sections 7 of the friction elements under the action of normal forces are not able to provide the kinematic effect through bilateral wedge crackers 13 and 14 on the side sections 8 and 9 of the friction elements. This mode is a certain rate of deceleration will cause the braking of the brake pulley 1. This reduces the angular velocity of its rotation.

The first stage of braking is complete. Further tightening of the brake bands 18 leads to the fact that in friction pairs increases the normal force acting on the Central section 7 of the friction elements. This circumstance causes the maximum deformation of the wavy spring 17 and the radial movement of the Central partition 7. Resulting in the Central sections 7 through bilateral wedge crackers 13 and 14, overcoming a slight force wave springs 15 and 16, being in engagement with the inner surface of the incoming branches 19 of the brake bands 18 of the side sections 8 and 9 plates 10 with a winning effort of clicking.

The necessary condition under which one of the double-sided V-crackers will be able to push the side with the Ktsia with sticking to it friction lining to the level of the working surface of the lining of the Central section, is it moving on the supporting cylindrical surface of the pulley under the action of the force Ρ

Thus, the right and left bevels of crackers 13 and 14 are grounds for lowering the Central section 7 under the action of the pressing force N1acting from the side of the brake bands 18. Top bevels crackers 13 and 14 provide lift and more (winning) preload working surfaces of the plates 10 of the side sections 8 and 9 to the inner surface of the brake bands 18. Thus, two-sided wedge crackers 13 and 14 provide lift and more (winning) preload working surfaces of the plates 10 of the side sections 8 and 9 to the inner surface of the brake bands 18. Thus, two-sided wedge crackers 13 and 14 are kind of the transfer device for determining the normal force N1from Central 7 to the side sections 8 and 9. Under the cascading branch 20 brake bands 18 of the Central section 7 with lining 10 behave the same way as when braking, the brake pulley 1.

In the second stage of braking under incoming branch 19 of the brake bands 18 dynamic coefficient of mutual overlap will bómore than under its cascading branch 20, which will lead to casimirarubio specific loads in the opposite pairs of friction brakes. the end result, and stops the brake pulley 1.

After completion of the process of braking brake band 18 is opened, which causes the wave springs 15, 16 and 17 due to the force of elasticity and raising the Central sections 7 over the side sections 8 and 9 of the friction elements, i.e. they occupy the position which he occupied before the first stage of braking.

Dismantling and installation of the friction elements on the cylindrical surface of the brake pulley 1 is produced as follows.

After wear attached friction pads 10 on the Central 7 and sides 8 and 9 sections to the allowed value Unscrew the screws 5 and remove the flange 3. Then remove the Central 7 and sides 8 and 9 of the section and remove remaining on them the material of the friction lining 10, and in their place paste new pads 10. Followed by the mounting of the friction elements on the abutment surface of the brake pulley 1, subjecting the flange 3.

Further, the first and second stage of braking repeated.

Sources of information

1. Auth. St. No. 1346877 (USSR), F 16 D 65/04, 1987. BI No. 10 (similar).

2. Auth. St. No. 1346877 (USSR), F 16 D 65/00, 1988. BI No. 35 (prototype).

Reunionagency band-Shoe brake, containing brake pulley, one of the flanges of which is removable, and has a recess defined therein a Central and two side sections with friction the plates, while the Central section is based on a wavy spring, and the side and center section in contact with the double-sided wedge crackers with the possibility of radial movement of the sections due to the interaction of their lateral surfaces with wavy springs, brake tape and a mechanical actuator, characterized in that the brake pulley recess made in the form of a dovetail with a cylindrical bearing surface, the perimeter of which is divided by jumpers on the n-th number of sectors, in each of which there is a Central section and two side sections, spring-loaded wave springs of different stiffness, and spring under the Central section, made of magnetized, while the inner conical surfaces of the flanges and in contact with the surfaces of the side sections of a radial recess in which is installed locking balls.



 

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