DE202011106752U1 - Brake conveyor roller - Google Patents

Abstract

Brake roller for a roller conveyor, the brake roller having a cylindrical casing, a bearing axis and an eddy current brake, the eddy current brake having two opposing rings, at least one of the rings being axially displaceable to the axis by a centrifugal force element driven by the rotation of the casing, the Displacement depends on the rotational speed of the casing, one of the rings having magnetic elements and the other of the rings having an annular surface with electrically conductive material, the direction of the poles of the magnetic elements being perpendicular to the annular surface.

Description

Brake rollers for roller conveyors are suitable for. For example, to regulate or limit the rolling speed of the sliding over the rollers piece goods in sloping roller conveyors.

Various delay devices and brake rollers for roller conveyors are known from the prior art. For example, describe the DE 1278936 A and the EP 1 243 528 A1 each delay devices for rollers. These delay devices have in common that they have a linearly increasing with the rotational speed of the roller braking force due to an eddy current brake.

In contrast, the invention has the object to provide an improved brake roller.

The object underlying the invention is achieved by the features of the independent claim. Preferred embodiments of the invention are indicated in the dependent claims.

There is provided a brake roller for a roller conveyor, wherein the brake roller has a cylindrical shell, a bearing axis and an eddy current brake, wherein the eddy current brake has two opposing rings, wherein at least one of the rings axially displaceable by an over the rotation of the shell driven centrifugal force element is, wherein the displacement depends on the rotational speed of the shell, wherein one of the rings magnetic elements and the other of the rings has an annular surface with electrically conductive material, wherein the polar direction of the magnetic elements is perpendicular to the annular surface with the electrically conductive material.

Embodiments of the invention have the advantage that, due to the centrifugal force element, the distance between the two rings varies as a function of the rotational speed of the jacket. As a result, the braking force generated by the eddy current brake also varies depending on the rotational speed of the cylindrical shell.

Characterized in that the polar direction of the magnetic elements is perpendicular to the annular surface, it is possible to keep the overall diameter of the brake roller low. Both centrifugal force element and eddy current brake are arranged one behind the other as viewed in the axial direction, thereby requiring only space in the axial direction of the brake roller. As a result, brake rollers with a small circumference can be realized without problems.

According to a further embodiment of the invention, one of the rings is stationary in the axial direction to the axis. Preferably, the axial stationary ring is fastened to the casing via a fastening means, wherein the fastening means is, for example, a clamping connection or a latching connection. This can have the advantage that the brake roller can be manufactured in a simple manner. For this purpose, only centrifugal element and axially movable ring must be arranged within the cylindrical shell to then fix the axially stationary ring on the jacket by a simple clip connection or by a simple Aufsteckvorgang. Is also, as provided according to an embodiment of the invention, the axially stationary ring on the end face of the brake roller fixed, thereby eliminating still another component, namely the frontal completion of the brake roller. Overall, this also minimizes the production costs of the brake roller.

According to one embodiment of the invention, a spring is arranged between the two rings, wherein the two rings are pressed apart by the spring, wherein the centrifugal force element is designed so that due to the rotation of the shell of the axially displaceable ring against the spring force reversibly on the other ring to is movable.

According to one embodiment of the invention, the centrifugal element is coupled via a transmission with the jacket. For example, the transmission is a planetary gear. The use of a transmission has the advantage that due to easy to implement high rotational speeds of the centrifugal force element, even at relatively low rotational speeds of the brake roller, that is the jacket, the centrifugal effect can be achieved. As a result, depending on the design of the transmission at any rotational speeds of the brake roller by appropriate gear design, the eddy current brake develop their braking effect.

According to a further embodiment of the invention, the centrifugal element comprises a first and a second surface and a centrifugal element, wherein the first and second surfaces are displaceable relative to each other axially to the axis, wherein the centrifugal element between the first and the second surface is arranged, wherein the first Surface is inclined to the second surface and the second surface is coupled to the axially displaceable ring, wherein the first and the second surface and the centrifugal element are formed so that in the case of driven by the jacket rotational movement of the surfaces, the two surfaces due to a resulting Centrifugal force for the movement of the Centrifugal element are moved apart relative to each other.

According to a further embodiment of the invention, the magnetic elements comprise ring-shaped juxtaposed permanent magnets with alternating polarity.

According to a further embodiment of the invention, the ring having the magnetic elements on its annular surface has recesses for frictionally receiving the magnets. This has the particular advantage that the eddy current brake of the brake roller can be produced in a mass production process. For example, the ring containing the magnetic elements could first be produced in an injection molding process, wherein subsequently the magnetic elements could be inserted into the recesses produced by the injection molding process in a mechanically simple manner.

According to a further embodiment of the invention, the ring carrying the electrically conductive material has at least one recess for frictionally receiving the electrically conductive material. This, in turn, has the advantage that in a mass production process, in particular using injection molding, the ring can first be produced, in order then to insert or press the electrically conductive material into the ring in a mechanically simple manner.

According to one embodiment of the invention, the second surface is identical to the axially displaceable ring.

It should be noted that the electrically conductive material may be any type of electrically conductive material, but which should not be magnetic. For example, aluminum or copper is suitable for this purpose.

It should also be noted that the "polar direction" of the magnetic elements is understood to be the north-south direction of the magnetic elements.

In the following, preferred embodiments of the invention are explained in more detail with reference to the drawings. Show it:

1 a schematic cross-sectional view of a brake roller,

2 a perspective view of a brake roller,

3 a cross-sectional view of a centrifugal element,

4 a cross-sectional view of a centrifugal element,

5 a schematic view of a centrifugal element with axially movable ring with magnetic elements,

6 a perspective view of an annular surface with electrically conductive material.

Identical or corresponding elements of the following embodiments are each identified by the same reference numerals.

The 1 shows a cross-sectional view of a brake roller 100 for a roller conveyor, wherein the brake roller has a cylindrical jacket 102 and an eddy current brake, wherein the eddy current brake has two opposing rings 116 and 106 having, wherein the ring 116 through an over the rotation of the mantle 102 driven centrifugal force element 122 . 124 axially to the axis 104 the brake roller is displaceable, wherein the displacement of the rotational speed of the shell 102 depends, with the ring 116 magnetic elements 118 and the ring 106 an annular surface with electrically conductive material 108 wherein the polar direction of the magnetic elements 118 perpendicular to the surface of the through the electrically conductive material 108 formed ring is.

Further, in 1 is a spring 114 which is between the ring 116 and the ring 106 is arranged and the two rings apart such that in the stationary state of the brake roller 100 A gap 112 between the rings 116 and 106 or between the magnetic elements 118 and the electrically conductive material 108 consists.

The centrifugal element has a first surface 122 and a second surface on, with the second surface on the back of the ring 116 is identical. The area 122 is starting from the axis 104 towards the ring 116 inclined, being between the area 122 and the ring 116 a cavity 122 consists. In the cavity 122 is a centrifugal element in the form of a sphere 124 recorded, wherein during a rotational movement of the brake roller 100 in the direction 128 the ball 124 also undergoes a rotational movement. This tells the bullet 124 a centrifugal force through which they move outward, that is towards 300 , is driven. The area 122 and the back of the ring 116 are now arranged to each other so that starting from the axis 104 seen in the radial direction, the distance of the surface 122 and the ring 116 decreases. By the centrifugal force in the direction 300 Therefore, a force acts in the axial direction 126 from the ball 124 on the ring 116 , This will make the ring 116 against the spring force of the spring 114 on the ring 106 moved.

Both the centrifugal element with surface 122 and ball 124 as well as the ring 116 with the magnets 118 is about a gearbox with the coat 102 coupled. The rotation of the shell thus also leads to an increased rotational movement of the centrifugal force element and the magnet 118 ,

With a large distance between the electrically conductive material 108 and the magnet 118 the eddy current braking effect is low. However, as soon as the rotational speed increases, the distance between the permanent magnet becomes due to the centrifugal force acting through the centrifugal force element 118 and the electrically conductive material 108 minimized. This steadily increases the eddy current braking force.

The result is a slow rotational movement of the shell 102 virtually no eddy current braking action takes place, but starting at a predeterminable rotational speed of the jacket 102 and a consequent high centrifugal force acting on the ball 124 acts, at higher speeds, the braking effect begins fully.

The said transmission is for example a planetary gear and is in 1 schematically with the reference numeral 130 characterized.

The 2 shows a perspective view of the brake roller 100 , where it is clearly visible that the ring 106 via a locking element 200 rotatable with the coat 102 connected is. About a camp 110 is the ring 106 and with it the coat 102 on the axis 104 stored. In 2 forms the ring 106 an axially non-displaceable, that is axially stationary ring, which on the end face of the brake roller 100 is fixed. For example, by a simple Aufsteckvorgang in the axial direction 126 can thus be the electrically conductive material 108 bearing ring 106 about a snap action with the coat 102 be fixed.

The 3 and 4 show two different states of the centrifugal element. So is in 3 the final state as it prevails in the case of a rotation of the shell at a high rotational speed. Due to the high rotational speed, a centrifugal force acts on the ball 124 , which thereby along the inclined surface 122 in the direction 300 runs to the outside. Through this outward run the ring 116 in the axial direction against the spring force 114 postponed.

In 4 on the other hand, a state of rest or a state of slow rotation of the shell is 102 illustrated, so that the prevailing centrifugal force is not enough, the ball 124 to move. The result is thus in 4 the ring 116 with its magnetic elements 118 in a home or hibernate state.

In the in 3 shown position of the ring 116 is the distance between the magnets 118 and the not visible here electrically conductive material very low, so that there is an induction of eddy currents. As a result, the brake roller undergoes a braking action.

In the in 4 On the other hand, the state shown is the distance between the magnets 118 and the electrically conductive material larger, thereby minimizing the eddy current braking effect.

In 5 is a perspective view of the arrangement of the permanent magnets 118 on the ring 116 seen. The ring 116 has recesses 500 for frictional absorption of the magnets 118 on. The magnets 118 are arranged in a ring next to each other with alternating polarity.

For example, the ring 116 with its recesses 500 be produced in an injection molding process, so that then by a simple press-fitting the magnets 118 in the recess 500 can be pressed.

The 6 shows a perspective view of the ring 106 which also has a recess 600 having. In this recess 600 is the electrically conductive material, also in the form of a ring, pressed. Thus, so can the ring 106 are also inexpensively manufactured, for example in a plastic injection molding process, so that subsequently only the electrically conductive material is pressed into this ring.

Further, in 6 is an accumulation of flattening 602 both the ring of electrically conductive material and the inside of the recess 600 , Basically, it is enough a flattening 602 provided. By the flattening 602 Ensures that even at high rotational speeds of the brake roller and strong braking forces that occur on the ring 106 and the electrically conductive material 108 act, no relative displacement of ring 106 and electrically conductive material takes place. Thus, it is sufficient, the recess 600 to provide that the electrically conductive material is fixed non-positively against movement in the axial direction. In contrast, to counteract a movement in the direction of rotation or against the direction of rotation, the flattening serves 602 ,

Further in 6 it can be seen the locking element 200 in the form of a latch, which in a counterpart recess of the shell 100 (see. 2 ) can intervene.

Through a simple insertion from the front side of the jacket 102 seen, so can the area 106 with the electrically conductive material 108 be fixed to the brake roller.

LIST OF REFERENCE NUMBERS

100

Drag reel

102

coat

104

axis

106

area

108

electrically conductive material

110

camp

112

gap

114

feather

116

ring surface

118

magnetic elements

120

room

122

area

124

centrifugal

126

axial direction

128

direction of rotation

130

transmission

200

locking element

300

centrifugal

500

admission

600

admission

602

flattening

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 1278936 A [0002]
• EP 1243528 A1 [0002]

Claims (12)

Brake roller for a roller conveyor, wherein the brake roller has a cylindrical shell, a bearing axis and an eddy current brake, wherein the eddy current brake has two opposing rings, wherein at least one of the rings is displaceable axially by an over the rotation of the shell driven centrifugal force element to the axis Displacement depends on the rotational speed of the shell, wherein one of the rings magnetic elements and the other of the rings has an annular surface with electrically conductive material, wherein the polar direction of the magnetic elements is perpendicular to the annular surface. Brake roller according to claim 1, wherein one of the rings is fixed in the axial direction to the axis. Brake roller according to claim 2, wherein the axially stationary ring is fixed to the jacket via a fastening means. Brake roller according to claim 3, wherein the fastening means is a latching connection. Brake roller according to claim 1, wherein between the two rings a spring is arranged, wherein the two rings are pressed apart by the spring, wherein the centrifugal force element is formed so that due to the rotation of the shell of the axially displaceable ring against the spring force reversible to the other ring is zubewegbar. Brake roller according to claim 1, wherein the centrifugal force element is coupled via a transmission with the jacket. Brake roller according to claim 1, wherein the centrifugal force element has a first and a second surface and a centrifugal element, wherein the first and second surfaces are axially displaceable relative to the axis, wherein the centrifugal element between the first and second surface is arranged, wherein the first surface of the inclined to the second surface and the second surface is coupled to the axially displaceable ring, wherein the first and the second surface and the centrifugal element are formed so that in the case of driven by the jacket rotational movement of the surfaces, the two surfaces due to a resulting centrifugal motion of the Centrifugal element are moved apart relative to each other. Brake roller according to claim 1, wherein the magnetic elements comprise ring-shaped juxtaposed permanent magnets with alternating polarity. Brake roller according to claim 8, wherein the magnetic elements having the ring has on its annular surface recesses for frictionally receiving the magnets. Brake roller according to claim 1, wherein the ring carrying the electrically conductive material has at least one recess for frictionally receiving the electrically conductive material. Brake roller according to claim 2, wherein the axially stationary ring is fixed to an end face of the brake roller. Brake roller according to claim 7, wherein the second surface is identical to the axially displaceable ring.

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