JP5143241B2 - Brake roller for conveyor - Google Patents

Description

  The present invention relates to a brake roller for a conveyor, and is used, for example, to prevent an excessively high speed of a workpiece that moves by its own weight on a conveyor in which a plurality of free rollers are arranged.

  In recent years, it has become important to deal with environmental issues such as the need to reduce CO2 from the viewpoint of global warming prevention, and energy saving is also important in transporting workpieces (conveyed items) in factories. .

  A roller conveyor using power such as an electric motor or air is often used for conveying a workpiece. In addition, it has often been conventionally performed to install a conveyor made of only free rollers with an inclination without using power and to transport a workpiece using gravity.

  When a free roller conveyor (free roller conveyor) is used, depending on the inclination angle and the weight of the workpiece, the workpiece may accelerate further and run away. Therefore, it is necessary to prevent such a runaway of the workpiece, and for that purpose, a brake roller has been conventionally used.

  Conventionally, a brake roller having a structure in which a brake member is mechanically pressed against the surface of a roller body to obtain a braking force by a frictional force is generally used.

  In addition, a brake roller has been proposed that has a configuration in which a permanent magnet and a metal body that rotates relative to the permanent magnet are combined to generate a braking force by generating an electromagnetic force due to an eddy current (Patent Document 1).

  In addition, the fluid is sealed in the inner space of the hollow roller body, and the fluid is agitated by the rotation of the roller body, and the flow of the fluid is resisted by the baffle plate fixed to the shaft to brake the fluid. A brake roller having a configuration for obtaining force has been proposed (Patent Document 2).

JP-A-8-208011 JP-A-9-77233

  However, the conventional brake roller that obtains frictional force by pressing the brake member against the surface of the roller has a problem that the surface of the roller is easily damaged and its durability cannot be sufficiently ensured. There is also a problem that the entire brake roller cannot be made compact. In addition, a structure in which a brake member is incorporated inside the roller has been proposed, but there is a problem that the overall shape, particularly the diameter of the roller becomes large, which is unusable.

  In addition, in the case of the brake roller described in Patent Document 1, it is necessary to increase the rotation speed of the metal body in order to obtain a sufficient braking force. There is a problem of increasing the size. In addition, the structure is complicated and disadvantageous in terms of cost.

  In the case of using the brake roller described in Patent Document 2, there is a problem that maintenance is troublesome because a fluid is used. Further, in order to obtain a sufficient braking force, there is a tendency that parts are enlarged in order to ensure strength, and the entire brake roller is enlarged.

  The present invention has been made in view of the above-described problems, and provides a brake roller that can generate a sufficient braking force by contact between a brake shoe and a brake drum portion and can be downsized. With the goal.

The brake roller according to the present invention includes a cylindrical roller cylinder, a shaft provided at an axial center of the roller cylinder to support rotation of the roller cylinder, and the roller cylinder provided inside the roller cylinder. A planetary gear mechanism for speed-up with the rotational force of the motor as an input, and a brake that is provided inside the roller cylinder so as to be rotatable about the shaft as an axis, and moves outward in the radial direction by centrifugal force due to the rotation A brake member provided with a shoe, a clutch member for transmitting rotational force output from the planetary gear mechanism to the brake member for rotation, and causing slippage when the transmission torque becomes excessive, and the roller cylinder Is provided on the inner peripheral surface side of the roller cylinder so as to rotate integrally with the brake cylinder and abuts when the brake shoe moves radially outward to generate a braking force. Possess a Kidoramu unit, wherein the brake member includes a cylindrical base provided so as to be rotatable with the shaft as the axis by the output of the clutch member, so as to protrude from the base of the side surface At least two swing arms that are swingable about a provided eccentric shaft, the brake shoes are provided on a peripheral surface, and the swing arms in a direction in which the brake shoes are separated from the brake drum portion. Each of the oscillating arms includes a base portion provided with a hole through which the eccentric shaft is inserted, an arm portion that continuously extends and oscillates to the base portion, and the arms. A head portion continuously extending from the arm portion to strongly swing the portion, and the brake shoe is provided on the arm portion of each swing arm, and Ne is stretched between the distal end portion of each of said oscillating arm and said eccentric shaft about the adjacent swing arm on the swing arm.

  Preferably, the clutch member includes a housing, a friction plate that is mounted inside the housing, and a convex portion provided on an outer peripheral edge engages with the concave portion of the housing and rotates integrally with the housing, and the friction plate A clutch plate that engages with the output shaft of the planetary gear mechanism and rotates together with the output shaft, and the friction plate and the clutch plate are pressed against each other. A biasing member that biases.

  Preferably, the clutch plate is a disc-shaped member made of a material including glass fiber, and the friction plates are provided one on each side of the clutch plate.

  Preferably, a rotation support member that is fitted to an inner peripheral surface of the roller cylinder and rotates integrally with the roller cylinder is provided so as to rotate integrally with the brake drum portion, and the shaft includes the roller cylinder The roller cylinder is provided so as to be relatively rotatable by a bearing provided at at least one end thereof and a bearing provided on the rotation support member.

  According to the present invention, it is possible to generate a sufficient braking force by the contact between the brake shoe and the brake drum portion, and it is possible to provide a compact and compact brake roller.

It is a section front view of the brake roller of this embodiment. It is sectional drawing which expands and shows the vicinity of the clutch member of a brake roller. It is a perspective view which shows the state which decomposed | disassembled the clutch member. It is a front view which expands and shows the vicinity of a brake member. It is a figure which shows the state which looked at the brake member in FIG. 4 from the A direction.

  In the brake roller 1 shown in FIG. 1, the shaft 12 and the support shaft 61 are non-rotatably attached to a well-known conveyor frame (not shown), and the roller cylinder 11 rotates around the shaft 12 and the support shaft 61.

  That is, in FIG. 1, the brake roller 1 includes a roller cylinder 11, a shaft 12, a planetary gear mechanism 13, a clutch mechanism 14, a brake mechanism 15, a support shaft portion 16, and the like.

  The roller cylinder 11 has a cylindrical shape made of a metal material, synthetic resin, or the like, and is supported with respect to the shaft 12 and the support shaft 61 by bearings 21 and 22 provided via end plates 20a and 20b at both ends. It is provided so as to be rotatable.

  The shaft 12 is made of a metal material or the like, and is provided at the axial center of the roller cylinder 11 in order to support the rotation of the roller cylinder 11. At the end of the shaft 12, there is provided a flat surface portion 12a having a two-surface width for non-rotatably attaching to a conveyor frame (not shown).

  The planetary gear mechanism 13 is provided inside the roller cylinder 11, increases the speed with the rotational force of the roller cylinder 11 as an input, and transmits the increased rotational force to the clutch mechanism 14. The planetary gear mechanism 13 is freely rotatable relative to the shaft 12. In the present embodiment, the planetary gear mechanism 13 has a known structure connected in two stages.

  That is, the inner teeth 33 are attached to the inner peripheral surface so as to rotate integrally with the roller cylinder 11, and the planetary gears 31 and 32 mesh with the inner teeth 33. Therefore, as the roller cylinder 11 rotates, the planetary gears 31 and 32 rotate and revolve, respectively, and a rotational force is output from the sun gear 34 that meshes with the planetary gear 32.

  The sun gear 34 is formed by integrally forming external teeth meshing with the planetary gear 32 and internal teeth continuous in the axial direction thereof. Each of these members of the planetary gear mechanism 13 can be manufactured by molding a synthetic resin.

  The rotational speed of the roller cylinder 11 can be increased several times to several tens of times by the sun gear 34. The speed increasing ratio can be variously set by selecting the number of teeth and other structures.

  The clutch mechanism 14 transmits the rotational force output from the planetary gear mechanism 13 to the brake mechanism 15 for rotation, and causes slipping when the transmission torque becomes excessive. As a result, excessive impact and damage to the member are prevented.

  2 and 3, the clutch mechanism 14 includes a housing 40, an input shaft portion 41, a clutch plate 42, a friction plate 43, a plate spring 44, and the like.

  The housing 40 includes a housing main body 40a and a lid body 40b, and is formed of a synthetic resin or the like. The outer peripheral surface of the flange portion 401 of the housing body 40 a is covered with the flange portion 402 of the lid body 40 b, and a plurality of locking portions 403 provided on the flange portion 402 are fitted into a plurality of protrusions 404 provided on the flange portion 401, respectively. The housing 40 is configured by integrating them.

  The input shaft portion 41 is formed by integrally forming external teeth that mesh with the internal teeth of the sun gear 34 and external teeth 41a that are continuous therewith. The input shaft portion 41 can be manufactured by molding synthetic resin. The portion of the external teeth 41 a of the input shaft portion 41 is inserted into the housing 40 through the hole of the lid body 40 b. The input shaft portion 41 is freely rotatable relative to the shaft 12.

  The clutch plate 42 is formed of two clutch plate members 42a and 42b having a disk shape (doughnut shape) made of a material containing glass fiber and having the same shape. The clutch plate members 42 a and 42 b have a circular outer diameter portion, and a plurality of teeth 421 and 421 are provided on the inner diameter portion, and the teeth 421 and 421 mesh with the outer teeth 41 a of the input shaft portion 41. Rotates integrally.

  The two clutch plate members 42a and 42b rotate integrally with their inner surfaces in contact with each other. Further, the two clutch plate members 42a, 42b can rotate while their outer surfaces are in contact with the friction plate 43. When an excessive external force is applied, the clutch plate members 42a, 42b and the friction plate 43 are rotated. A slip occurs between the two.

  Since the two clutch plate members 42a and 42b are used in this way, when one of them wears, only the worn clutch plate members 42a and 42b need be replaced. However, only one clutch plate member may be used.

  The friction plate 43 is formed of two friction plate members 43a and 43b having the same shape and a disk shape (doughnut shape) made of a metal material such as an iron plate, a zinc steel plate, or a copper plate. The friction plate members 43a and 43b have a circular inner diameter portion, but are provided with a plurality of convex portions 431 and 431 on the outer diameter portion (outer peripheral edge), and the convex portions 431 and 431 are flanges of the housing body 40a. It engages with a recess 405 provided in the part 401 and rotates integrally.

  The plate spring 44 is made of a spring steel plate or the like, and is formed in a ring shape that is bent in the plate thickness direction. When the leaf spring 44 is mounted in the housing main body 40a, the leaf spring 44 presses and urges the clutch plate 42 and the friction plate 43 so as to generate an appropriate contact pressure.

  The housing 40 is supported by the bearing 23 so as to be rotatable with respect to the shaft 12.

  The brake mechanism 15 includes a base 50, two swing arms 51 and 51, a brake drum 52, and the like.

  4 and 5, base 50 is formed in a ring shape (doughnut shape) from a metal material or the like. The base 50 is rotatably supported with respect to the shaft 12 by the bearing 24, and is fitted into the outer peripheral surface of the housing main body 40a and rotates integrally therewith. That is, the base 50 can be rotated about the shaft 12 by the output from the clutch mechanism 14.

  Since the two swing arms 51 and 51 have the same structure, only one will be described.

  That is, the oscillating arm 51 is rotatable around the brake shaft 53 that is located in a position deviated from the axial center inside the roller cylinder 11 and that protrudes in the axial direction from the side surface of the base 50. As shown, the base 50 is attached. When the base 50 rotates, the swing arm 51 rotates integrally therewith, and swings outward in the radial direction by the centrifugal force generated by the rotation.

  That is, the swing arm 51 can swing around the brake shaft 53 that is an eccentric shaft provided so as to protrude from the side surface of the base 50.

  The swing arm 51 is, when viewed from the front (the state shown in FIG. 5), a base portion 51a provided with a hole through which the brake shaft 53 is inserted, an arm portion 51b that swings continuously from the base portion 51a, and an arm portion. In order to strongly swing 51b, a head portion 51c continuously extended from the arm portion 51b is provided.

  A groove 511 extending in the axial direction is provided on the outer peripheral surface of the arm portion 51b, and a part of the brake shoe 54 is fitted into the groove 511 and attached by an adhesive.

  The swing arm 51 is prevented from coming off by a retaining ring 531 in a state where the brake shaft 53 is inserted into the hole of the base 51a.

  The head portion 51c has a large weight and plays a role of strongly pressing the brake shoe 54 against the brake drum 52 when centrifugal force is applied.

  One end of a coil spring (tensile coil spring) 55 is inserted into and engaged with a hole 512 provided in the head portion 51 c, and the other end of the coil spring 55 is wound around a brake shaft 53 that supports the other swing arm 51. ing. That is, the swing arm 51 is urged by the coil spring 55 so as to go inward in the radial direction about the brake shaft 53, in other words, in a direction away from the inner peripheral surface of the brake drum 52. .

  Thus, in this embodiment, the coil spring 55 is used as a brake return urging member. Further, at least two swing arms 51, 51 are provided on the same side surface of the base 50, and the brake shaft for the swing arm 51 adjacent to each swing arm 51 and the distal end portion of each swing arm 51. Coil springs 55 are respectively stretched between the two.

  Further, two protrusions 501 are provided on the side surface of the base 50 at symmetrical positions with respect to the axis, and the swing arm 51 urged radially inward by the coil spring 55 has its head. The portion 51c is brought into contact with the protruding portion 501 to be positioned inward in the radial direction [state shown in FIG. 5A].

  Note that the protrusion 501 is provided with a lower portion lower than that continuous on the outside in the radial direction.

  The brake shoe 54 is formed in a square plate shape when viewed from the front by an alloy material having wear resistance. The surface of the brake shoe 54 is a flat surface, but may be formed on a circumferential surface along the inner circumferential surface of the brake drum 52.

  The brake drum 52 is provided on the inner peripheral surface side of the roller cylinder 11 so as to rotate integrally with the roller cylinder 11. When the brake shoe 54 moves radially outward, the outer peripheral surface of the brake shoe 54 comes into contact with the inner peripheral surface of the brake drum 52 to generate a braking force (see FIG. 5B).

  The brake drum 52 is supported by the bearing 25 so as to be rotatable with respect to the shaft 12.

  A cylindrical spacer 27 for positioning in the axial direction is provided between the bearing 24 and the bearing 25. The spacers 27 are positioned in the axial direction with a clearance between the base 50 and the brake drum 52.

  As shown in FIG. 1, a rotation support member 56 is provided so that the brake drum 52 rotates integrally with the roller cylinder 11.

  That is, the rotation support member 56 is fitted to the inner peripheral surface of the roller cylinder 11 and rotates integrally with the roller cylinder 11. The rotation support member 56 is formed, for example, into a shape having a disk-shaped portion and an outer peripheral edge flange extending in the axial direction from the outer peripheral end of the disk-shaped portion by pressing a metal plate. The disk-like portion is supported by the bearing 26 so as to be rotatable with respect to the shaft 12. The outer peripheral edge flange comes into contact with the inner peripheral surface of the roller cylinder 11 and rotates integrally with the frictional force thereof.

  From the end surface of the brake drum 52, an engagement pin 57 protrudes in the axial direction, and the engagement pin 57 is inserted into a hole provided in the disk-like portion of the rotation support member 56 to engage in the rotation direction. This causes them to rotate together.

  As can be seen from the above description, the shaft 12 rotates relative to the roller cylinder 11 by the bearing 21 provided at one end of the roller cylinder 11 and the bearing 26 provided on the rotation support member 56. Supported as possible.

  The support shaft portion 16 includes a bearing 22 supported by an end plate 20 b provided at an end portion of the roller cylinder 11 and a support shaft 61. A cover 62 made of synthetic resin or the like is attached to the inner end face of the end plate 20b with screws.

  Next, the operation of the brake roller 1 will be described.

  The brake rollers 1 are attached to the free roller conveyor one by one at a pitch shorter than the length of the workpiece. Therefore, normally, a plurality of free rollers are arranged between one brake roller 1 and the next brake roller 1. At that time, the shaft 12 of the brake roller 1 is non-rotatably attached to the conveyor frame.

  Note that such a method of attaching the brake roller 1 to the conveyor frame is known, and for example, descriptions in Japanese Patent Application Laid-Open Nos. 7-137821 and 7-285628 can be referred to.

  As the work moves on the brake roller 1, the roller cylinder 11 rotates. Then, the rotational force of the roller cylinder 11 is increased by the planetary gear mechanism 13, and the input shaft portion 41 is rotated by the output portion of the sun gear 34.

  The clutch plate 42, the friction plate 43, the housing 40, and the base 50 are rotated by the rotation of the input shaft portion 41, and the rotational force is transmitted to the brake mechanism 15. At this time, the base 50 rotates in a direction opposite to the rotation direction of the roller cylinder 11.

  When the base 50 rotates, the swinging arm 51 swings outward in the radial direction by the centrifugal force caused thereby, whereby the brake shoe 54 moves outward in the radial direction and contacts the inner peripheral surface of the brake drum 52. Touch. Due to this frictional force, a braking force is generated in the brake shoe 54. This braking force is amplified by the planetary gear mechanism 13 and transmitted to the roller cylinder 11, and becomes a sufficiently large braking force.

  Thereby, the rotation speed of the roller cylinder 11 is suppressed, and the workpiece is prevented from moving at an excessive speed.

  Further, since the brake shoe 54 and the brake drum 52 are in contact with each other while rotating in opposite directions, a larger braking force is generated. Since the rotational speed of the oscillating arm 51 is increased by the planetary gear mechanism 13, the centrifugal force applied to the oscillating arm 51 is increased, and a braking force is easily obtained.

  In addition, the brake shoe 54 and the brake drum 52 are in sliding contact with each other, but by appropriately selecting these materials, it is possible to minimize their wear and scratches. In addition, even in the event of a scratch, functional and aesthetic problems are unlikely to occur.

  Since the braking force by the brake mechanism 15 is amplified by the planetary gear mechanism 13, even if the frictional force between the brake shoe 54 and the brake drum 52 is small, the necessary large braking force can be obtained. Further, by selecting optimal materials for the brake drum 52 and the brake shoe 54, it is possible to sufficiently ensure the durability.

  According to the brake roller 1 of the embodiment described above, the planetary gear mechanism 13, the clutch mechanism 14, and the brake mechanism 15 are compactly mounted along the axial direction inside the roller cylinder 11. An outer diameter can be made small and the brake roller 1 can be reduced in size.

  Therefore, the brake roller 1 having the same outer diameter as the free roller in the conveyor can be easily manufactured, and the conveyor that prevents the workpiece speed from becoming excessive simply by changing some of the free rollers to the brake roller 1. It can be.

  Further, the brake roller 1 of the present embodiment can be used as a motor roller by changing the brake mechanism 15 portion to a motor. That is, it is possible to share many parts with the motor roller disclosed in Japanese Patent Application Laid-Open Nos. H7-133721 and H7-285628, which is advantageous in manufacturing and maintenance.

  According to the brake roller 1 of this embodiment described above, an outer diameter can be 38-60 mm, for example. Moreover, the attachment to a conveyor, the adjustment after attachment, etc. are easy.

  In this regard, the brake roller having the conventional structure has a large outer diameter of, for example, 86 mm, and is complicated to install and adjust.

  And according to the brake roller 1 of this embodiment, when the inclination angle of a conveyor is about 30 degree | times, a workpiece | work with a weight of 5-100 kg is possible, for example. In addition, when the conveyor has an inclination angle of about 3 degrees, it is possible to carry a workpiece up to a weight of 1000 kg.

  When the brake roller 1 of this embodiment is used, the runaway and damage of the work are prevented, noise is reduced, and safety is improved. It is easy to accumulate the work on the conveyor.

  In the embodiment described above, the planetary gear mechanism 13 may have one stage or three or more stages. The clutch mechanism 14 can be omitted. Since the two oscillating arms 51 and 51 are provided at point-symmetrical positions shifted by 180 degrees, the balance is good. However, three or more swing arms 51 may be provided in a balanced manner.

  The material and shape of the brake shoe 54 may be various other than those described above. It is also possible to configure the brake shoe 54 by a part of the swing arm 51. The base 50, the swing arm 51, the brake drum 52, and the like can be manufactured by molding using, for example, sintered metal.

  The attachment position of the coil spring 55 may be a position other than that described above. It is also possible to use a compression coil spring as the coil spring 55. Instead of the coil spring 55, a plate spring or other springs can be used.

  In addition, the configuration, structure, material, shape, number, arrangement, etc. of each part or the whole of the roller cylinder 11, the shaft 12, the planetary gear mechanism 13, the clutch mechanism 14, the brake mechanism 15, and the brake roller 1 are the gist of the present invention. Can be changed accordingly.

DESCRIPTION OF SYMBOLS 1 Brake roller 11 Roller cylinder 12 Shaft 13 Planetary gear mechanism 14 Clutch mechanism (clutch member)
15 Brake mechanism (brake member)
21, 26 Bearing 40 Housing 42 Clutch plate 43 Friction plate 44 Plate spring (biasing member)
405 Concave portion 431 Convex portion 50 Base 51 Swing arm 52 Brake drum 53 Brake shaft (eccentric shaft)
54 Brake shoe 55 Coil spring (brake return urging member)
56 Rotation support member

Claims (4)

A cylindrical roller tube;
A shaft provided at the axial center of the roller cylinder to support the rotation of the roller cylinder;
A planetary gear mechanism provided inside the roller cylinder for speeding up the rotational force of the roller cylinder as an input;
A brake member provided inside the roller cylinder so as to be rotatable about the shaft as an axis, and provided with a brake shoe that moves radially outward by centrifugal force due to the rotation;
A clutch member that transmits a rotational force output from the planetary gear mechanism to the brake member and rotates the clutch member, and causes a slip when a transmission torque becomes excessive; and
A brake drum portion provided on the inner peripheral surface side of the roller cylinder so as to rotate integrally with the roller cylinder and generating a braking force by abutting when the brake shoe moves radially outward. And
The brake member is centered on a cylindrical base provided so as to be rotatable about the shaft by an output of the clutch member and an eccentric shaft provided so as to protrude from a side surface of the base. At least two swing arms that are swingable and provided with the brake shoes on a peripheral surface; and a tension spring that biases the swing arms in a direction in which the brake shoes are separated from the brake drum portion; Have
Each of the swing arms includes a base portion provided with a hole through which the eccentric shaft is inserted, an arm portion extending continuously from the base portion and swinging, and an arm portion for strongly swinging the arm portion. Having a continuously extending head,
The brake shoes are provided on the arm portions of the swing arms, and the tension springs are arranged on the tip end portions of the swing arms and the eccentric shafts of the swing arms adjacent to the swing arms. Stretched between,
The brake roller for conveyors characterized by the above-mentioned. The clutch member is
A housing;
A friction plate mounted inside the housing and having a convex portion provided on an outer peripheral edge thereof engaged with the concave portion of the housing and rotating integrally with the housing;
A clutch plate capable of rotating in contact with the friction plate, engaging with an output shaft of the planetary gear mechanism and rotating integrally with the output shaft;
An urging member that urges the friction plate and the clutch plate to press against each other;
The brake roller for conveyors of Claim 1. The clutch plate is a disc-shaped one made of a material containing glass fiber,
The friction plates are provided one on each side of the clutch plate,
The brake roller for conveyors of Claim 2. A rotation support member that engages with the inner peripheral surface of the roller cylinder and rotates integrally with the roller cylinder is provided so as to rotate integrally with the brake drum portion,
The shaft is
A bearing provided at at least one end of the roller cylinder and a bearing provided on the rotation support member are provided so as to be rotatable relative to the roller cylinder.
The brake roller for conveyors in any one of Claims 1 thru | or 3 .

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