JP6454292B2 - Passenger conveyor - Google Patents

Description

  The present invention relates to passenger conveyors such as escalators and moving walkways, and more particularly to passenger conveyors using inverters.

  Passenger conveyors, such as escalators and moving walkways, are endlessly connected steps that move between two entrances, or pallets (hereinafter referred to as treads), and railings provided on both sides of the treads, The balustrade is composed of a handrail that moves in synchronization with the tread, and the passenger is transported by a tread that moves from one entrance to the other entrance.

  In such a passenger conveyor, there is one that drives a motor by inverter control in order to make the operation speed variable.

  When the motor is operated by inverter control, a voltage is induced on the motor shaft due to factors such as three-phase imbalance by PWM control. For this reason, a potential difference is generated between the motor shaft and the motor frame, and this potential difference may reach the breakdown voltage of the oil film in the motor bearing. Or even if this potential difference does not reach the dielectric breakdown voltage of the oil film in the motor bearing, a minute current may flow through the bearing due to deterioration of the bearing grease (cause of oil film breakage or the like). These phenomena may cause a phenomenon called electric corrosion that causes a scratch on the bearing raceway surface or ball surface, which may damage the bearing and cause abnormal noise in the motor.

As means for preventing this electrolytic corrosion, the following methods are conventionally known.
(1) Method of not energizing the motor shaft by electrical insulation of the bearing part (2) Method of applying conductive grease to the bearing and removing the voltage of the motor shaft (3) Conductive brush integrated in the motor (4) A method of removing a voltage by bringing a conductive brush fixed on a motor frame into contact with a motor shaft. For example, Japanese Patent Laying-Open No. 2015-95440 (Patent Document 1) includes a brush member having a holding portion formed by a holding yarn that holds a plurality of brush yarns, and a holding body that has a locking portion that can lock the holding portion and holds the brush member. And a conductive brush used in contact with the rotating shaft of the motor is described (see summary).

Japanese Patent Laid-Open No. 2015-95440

  However, it is difficult for conductive grease to maintain conductivity for a long period of time, and a dedicated motor is required to electrically insulate the bearing portion or to provide a static eliminating brush integrated in the motor. Further, in the method of attaching the static elimination brush to the motor frame, when other components are attached to the motor shaft, the static elimination brush and other components attached to the motor shaft may interfere with each other. Particularly in the case of a passenger conveyor motor, it is necessary to attach a pulley and a flywheel to the motor shaft. For this reason, in the passenger conveyor motor, the main body of the motor shaft is not exposed in the vicinity of the motor frame. Moreover, when installing the static elimination brush in the state which contacts a motor shaft, the static elimination brush interferes with a flywheel. Therefore, in the passenger conveyor motor, it is difficult to install the neutralizing brush in a state of contacting the motor shaft. In particular, in an existing passenger conveyor motor, it is difficult to install the neutralizing brush in a state of contacting the motor shaft.

  An object of the present invention is to improve the reliability of a passenger conveyor by providing a structure for attaching a static elimination brush that can be easily attached to an existing passenger conveyor motor and is easy to maintain and adjust. There is to plan.

In order to achieve the above object, the passenger conveyor of the present invention comprises:
A plurality of treads connected endlessly; a motor that circulates and moves the plurality of treads between one boarding gate and the other boarding gate; and an inverter that supplies AC power to the motor. Passenger conveyor with flywheel and pulley attached to the output shaft of
The motor includes a static elimination brush disposed between the side surface on the output shaft side and the flywheel,
The static elimination brush is disposed in contact with the pulley.

  ADVANTAGE OF THE INVENTION According to this invention, the static elimination brush can be simply attached also to the existing motor for passenger conveyors, the attachment structure of the static elimination brush which can be maintained and adjusted easily can be provided, and the reliability of a passenger conveyor is improved. Can be achieved. Problems, configurations, and effects other than those described above will be clarified by the following description of embodiments.

It is a schematic side view which shows the structure of the passenger conveyor which concerns on one Example of this invention. It is a schematic block diagram of the drive device part in the passenger conveyor shown in FIG. It is a schematic external view of the brush part of the static elimination brush which concerns on one Example (Example 1) of this invention. It is sectional drawing of the static elimination brush which shows the III-III cross section of FIG. 3A. It is a schematic external view of the static elimination brush attachment bracket which concerns on one Example (Example 1) of this invention. It is sectional drawing of the static elimination brush attachment bracket which shows the IVB-IVB cross section of FIG. 4A. It is the schematic block diagram which attached the static elimination brush shown to FIG. 3A and FIG. 3B and the bracket shown to FIG. 4A and FIG. 4B to the motor for passenger conveyors, and is the figure seen from the direction perpendicular | vertical to a motor shaft. It is the schematic block diagram which attached the static elimination brush shown to FIG. 3A and FIG. 3B and the bracket shown to FIG. 4A and FIG. 4B to the motor for passenger conveyors, and is the figure seen from the axial direction of the motor shaft. It is an enlarged view which expands and shows the VC part of FIG. 5A. It is a schematic block diagram of the static elimination brush which concerns on one Example (Example 2) of this invention. It is the schematic block diagram which attached the static elimination brush shown to FIG. 6A to the motor for passenger conveyors. It is a schematic block diagram of the motor for passenger conveyors which attached the electricity_supply determination apparatus which concerns on one Example (Example 3) of this invention.

  Embodiments of the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to the following embodiments, and various modifications and application examples are included in the technical concept of the present invention. It is included in the range.

  Passenger conveyors include escalators and moving walkways. Escalators are installed between different floors of the building, and the treads are circulated in a staircase pattern. The moving sidewalk is installed with a horizontal or gentle slope, and the tread surface is not stepped, that is, the tread surface is circulated without a step between adjacent tread surfaces. The present invention can be applied to both escalators and moving walkways. In escalators, the tread is usually called a step. On the other hand, on a moving sidewalk, the tread is usually called a pallet. In the present embodiment, a step and a pallet including a step and a pallet are referred to and described.

  Hereinafter, an escalator will be described as an example of a passenger conveyor according to the present invention. In the following description, the width direction is a direction perpendicular to the traveling direction of the tread (the direction in which the passenger conveyor extends) and parallel to the horizontal plane.

  First, with reference to FIG.1 and FIG.2, the structure of the passenger conveyor 100 and the drive device 200 is demonstrated. FIG. 1 is a schematic side view showing the structure of a passenger conveyor according to one embodiment of the present invention. FIG. 2 is a schematic configuration diagram of a drive device portion in the passenger conveyor shown in FIG.

  The passenger conveyor (escalator) 100 includes a main body frame 101 erected between the lower floor F1 and the upper floor F2, and is connected to the main body frame 101 endlessly by two tread chain chains 9. A plurality of step boards (steps) 10 that circulates and moves between the entrance 104 of the lower floor F1 and the entrance 105 of the upper floor F2. A balustrade 102 is erected on both sides in the width direction of the tread board 10, and a handrail 103 that moves in the same direction as the tread board 10 is supported by the balustrade 102. The moving handrail 103 changes its traveling direction at both ends of the balustrade 102 and circulates between the entrance 104 of the lower floor F1 and the entrance 105 of the upper floor F2.

  A machine room 106 is provided at one end of the main body frame 101 (in this embodiment, the end on the upper floor F2 side). In the machine room 106, a driving device 200 for a passenger conveyor and a control panel (control device) 107 for controlling the driving device 200 are arranged. The drive device 200 includes a passenger conveyor motor (hereinafter referred to as a motor) 1, a drive belt 4, a speed reducer 5, a drive chain 7, a sprocket 8 </ b> A, and a brake 6.

  The rotational force (driving force) of the motor 1 is transmitted to the speed reducer 5 via the driving belt 4. For this purpose, the drive belt 4 is stretched between a pulley 3 attached to the motor shaft 2 (see FIG. 5C) of the motor 1 and a pulley 5A attached to the speed reducer. The rotational force of the motor 1 is decelerated by the speed reducer 5 and then transmitted to the sprocket 8A via the drive chain 7, and the sprocket 8A is rotationally driven. The sprocket 8A is provided with a drive chain winding portion (drive chain sprocket) around which the drive chain 7 is wound, and a tread plate chain winding portion (step plate chain sprocket) around which the tread plate chain 9 is wound. As a result, the tread plate chain 9 wound around the sprocket 8A and the tread plate 10 connected to the tread plate chain 9 are driven.

  A sprocket 8B is arranged at the other end of the main body frame 101 (in this embodiment, the end on the lower floor F1 side). A tread chain 9 is wound around the sprocket 8B. That is, the tread plate chain 9 is stretched endlessly between the sprocket 8A and the sprocket 8B.

  The motor 1 includes a flywheel 11 attached to the pulley 3 in order to increase inertia force and adjust deceleration when stopped.

  A power supply device 108 is connected to the motor 1 that drives the tread board 10 through an inverter 24 in order to supply electric power to the motor 1. The inverter 24 converts the power supply of the power supply device 108 into AC power having a predetermined voltage and a predetermined frequency. The inverter 24 may be regarded as a part of the driving device 200.

  Next, with reference to FIG. 3A and 3B, the structure and shape of the static elimination brush attached to the motor 1 are demonstrated. FIG. 3A is a schematic external view of a brush portion of a static elimination brush according to an embodiment (Example 1) of the present invention. FIG. 3B is a cross-sectional view of the static elimination brush showing the III-III cross section of FIG. 3A.

  The static elimination brush 12 is comprised from the brush part 12A which is a bundle | flux of conductive hair-like wires made from stainless steel or carbon, and a brush fixing part 12B that fixes the brush part 12A. The brush fixing portion 12B is provided with a mounting hole (mounting hole) 12C penetrating from the front surface 12Ba side to the back surface 12Bb side. Both the brush portion 12A and the brush fixing portion 12B are thin structures having a thickness of about 4 mm.

  Next, a configuration in which the static elimination brush 12 is attached to the motor 1 will be described with reference to FIGS. 4A, 4B, 5A, 5B, and 5C. FIG. 4A is a schematic external view of a static elimination brush mounting bracket according to an embodiment (Example 1) of the present invention. 4B is a cross-sectional view of the static elimination brush mounting bracket showing a cross section IVB-IVB of FIG. 4A. FIG. 5A is a schematic configuration diagram in which a static elimination brush shown in FIGS. 3A and 3B and a bracket shown in FIGS. 4A and 4B are attached to a passenger conveyor motor, as viewed from a direction perpendicular to the motor shaft. FIG. 5B is a schematic configuration diagram in which the static elimination brush shown in FIGS. 3A and 3B and the bracket shown in FIGS. 4A and 4B are attached to the passenger conveyor motor, as viewed from the axial direction of the motor shaft. FIG. 5C is an enlarged view showing the VC portion of FIG. 5A in an enlarged manner.

  In the passenger conveyor motor 1, a pulley 3 is attached to a motor shaft (rotating shaft or output shaft) 2, and a flywheel 11 is attached to the pulley 3. That is, the flywheel 11 is attached to the motor shaft 2 via the pulley 3. In this case, the pulley 3 is fixed to the motor shaft 2 and the flywheel 11 is fixed to the pulley 3, so that the motor shaft 2, the pulley 3 and the flywheel 11 are fixed to each other. In this mounting structure, the pulley 3 has an outer peripheral surface 3 </ b> A exposed between the flywheel 11 and the side surface of the motor 1 on the shaft side. The shaft side surface is a side surface on the output shaft side (output shaft side surface) of both end surfaces of the motor 1 in the axial direction of the motor 1 and may be referred to as an output shaft side end surface.

  The motor 1 includes a motor frame portion 15 that covers the outer periphery, and an end bracket 25 that is provided on a side portion on the output shaft side of the motor frame 15 and constitutes a side surface of the motor 1. The motor frame portion 15 and the end bracket 25 constitute a motor housing that includes a stator and a rotor that are components of the motor 1.

  The end bracket 25 is fixed to the motor frame portion 15 with fixing bolts 30. In this embodiment, a static elimination brush mounting bracket (hereinafter referred to as a bracket) 14 that can be attached to the fixing bolt 30 is provided. The bracket 14 is provided with a static elimination brush attachment portion 14A for attaching the static elimination brush 12, and a bolt fixing portion 14B is provided at both ends of the static elimination brush attachment portion 14A. The bolt fixing portion 14B has protrusions 14C protruding from both ends of the static elimination brush attachment portion 14A in a direction perpendicular to the longitudinal direction of the static elimination brush attachment portion 14A (the direction connecting both ends where the bolt fixation portion 14B is provided). It is comprised at the front-end | tip part.

  The bracket 14 is provided with a plurality of screw holes (fixing holes or bolt fastening portions) 14D for attaching the brush fixing portion 12B of the static elimination brush 12. A plurality of fixing holes 14D are provided for one mounting hole 12C formed in the brush fixing portion 12B. Therefore, by selecting the fixing hole 14D to be used from the plurality of fixing holes 14D, the position of the brush fixing portion 12B with respect to the bracket 14 can be adjusted vertically and horizontally. That is, the position of the static elimination brush 12 can be adjusted in the perspective direction approaching or moving away from the pulley 3 (motor shaft 2) of the motor 1, and the static elimination is performed in a direction perpendicular to the perspective direction and the axial direction of the motor shaft 2. The position of the brush 12 can be adjusted. Instead of providing a plurality of fixing holes 14D, a long hole may be provided in the brush fixing portion 12B so that the position of the brush fixing portion 12B can be adjusted vertically and horizontally. In addition, the fixing hole (screw hole) 14D may have a structure (form) having a thread groove, or may be a simple through hole. In the present embodiment, the fixing hole (screw hole) 14D is a through hole. In this case, the neutralizing brush 12 is fixed using the bolt 31 and the nut 32.

  Thus, by attaching the bracket 14 to the end bracket 25 and attaching the brush fixing portion 12B to the bracket 14, the brush tip of the brush portion 12A fixed to the brush fixing portion 12B contacts the pulley 3, and the brush portion 12A and The neutralizing brush 12 is attached to the motor 1 so that the brush fixing portion 12B does not interfere with the flywheel 11.

  The neutralizing brush 12 provided on the end bracket 25 is electrically connected to the motor frame portion 15 of the motor 1 and contacts the outer peripheral surface 3A of the pulley 3 to electrically connect the motor shaft 2 and the motor frame portion 15 to each other. Connect to. The static elimination brush 12 releases the voltage induced in the motor shaft 2 to the motor frame portion 15 so that the motor shaft 2 and the motor frame portion 15 are equipotential.

  By setting it as such a structure, it is possible to simply attach to the motor of the existing passenger conveyor, without installing the static elimination brush 12 in a motor. Moreover, the static elimination brush 12 and its attachment structure part (a bracket 14, an attachment bolt, etc.) can be comprised with an inexpensive component. As described above, in this embodiment, a simple and inexpensive (low cost) mounting structure can obtain a charge removal effect of the motor shaft 2 and prevent electrolytic corrosion.

  Further, during operation of the passenger conveyor 100, since the motor shaft 2 and the pulley 3 rotate with the pulley 3 in contact with the brush tip of the brush portion 12A, the brush tip portion is worn and the brush portion 12A is shortened. When the brush portion 12A is shortened, the brush tip of the brush portion 12 does not come into contact with the pulley 3, and the neutralization effect may be lost. Therefore, the contact between the pulley 3 and the brush portion 12A is periodically checked, and when the contact is not made, the brush portion 12 is replaced. Alternatively, by changing the position of the fixing hole 14 </ b> D of the bracket 14, the neutralizing brush 12 is lowered in the vertical direction and the position of the neutralizing brush 12 is adjusted so that the brush portion 12 contacts the pulley 3. Alternatively, the neutralizing brush 12 is moved in the left-right direction, and the position of the neutralizing brush 12 is adjusted so that a portion where the brush portion 12A is not worn contacts the pulley 3. As described above, in this embodiment, the position adjustment of the static elimination brush 12 can be easily performed, and the wear of the static elimination brush 12 can be easily dealt with. Thereby, while maintenance of a passenger conveyor becomes easy, the reliability of a passenger conveyor can be improved. In addition, when the static eliminating brush 12 is newly attached, the position of the static eliminating brush 12 with respect to the bracket 14 can be easily adjusted, so that parts can be shared between different models of the motor 1.

  As described above, in the present embodiment, the above configuration facilitates maintenance and adjustment work.

  As described in the first embodiment, during operation of the passenger conveyor, the motor shaft 2 and the pulley 3 rotate while the brush tip of the brush portion 12A is in contact with the pulley 3, so that the brush tip portion wears and the brush The portion 12A is shortened, and the brush tip of the brush portion 12 may not come into contact with the pulley 3.

  Therefore, in this embodiment, a mechanism for adjusting the position of the static elimination brush 12 is provided. A configuration of a mechanism that automatically adjusts the position of the static elimination brush 12 will be described with reference to FIGS. 6A and 6B. FIG. 6A is a schematic configuration diagram of a static elimination brush according to an embodiment (Example 2) of the present invention. FIG. 6B is a schematic configuration diagram in which the static elimination brush shown in FIG. 6A is attached to a passenger conveyor motor. The same components as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and the description thereof is omitted.

  The static elimination brush 12 is comprised from the brush part 12A which is the bundle | flux of the conductive hair-like line | wire, and the brush fixing | fixed part 12B which has fixed the brush part 12A. Both the brush portion 12A and the brush fixing portion 12B are thin structures having a thickness of about 4 mm. The static elimination brush 12 is attached to the bracket 14 so as to be urged downward (motor shaft 12 side) with respect to the bracket 14 by an elastic body such as a spring 16. That is, as shown in FIGS. 6A and 6B, the bracket 14 is attached to the end bracket 25, and the static elimination brush 12 is attached to the bracket 14. At this time, with the spring 16 compressed, the brush tip of the brush portion 12A is pressed against the pulley 3 to attach the brush fixing portion 12B to the bracket 14. With this configuration, even when the brush portion 12 is shortened due to wear, an elastic force is applied to the neutralizing brush 12 by the spring 16 in the vertical direction so that the neutralizing brush 12 is pressed against the outer peripheral surface of the pulley 3. Therefore, the position of the static elimination brush 12 moves in the vertical downward direction (direction toward the motor shaft 2), and the brush tip of the brush portion 12 is always in contact with the pulley 3.

  As described above, in this embodiment, the position of the static elimination brush 12 can be automatically adjusted so that the brush tip of the brush portion 12 contacts the pulley 3. Thereby, in this embodiment, maintenance and adjustment work are facilitated.

  In the present embodiment, the configuration other than the configuration in which the static elimination brush 12 is urged by the spring 16 is configured similarly to the first embodiment. Therefore, the operational effects described in the first embodiment are the same in this embodiment.

  As described in the first embodiment, during operation of the passenger conveyor, the motor shaft 2 and the pulley 3 rotate while the brush tip of the brush portion 12A is in contact with the pulley 3, so that the brush tip portion wears and the brush The portion 12A is shortened, and the brush tip of the brush portion 12 may not come into contact with the pulley 3.

  Therefore, in this embodiment, a device for determining whether or not the pulley 3 and the brush portion 12 are in contact is provided. With reference to FIG. 7, the configuration of the energization determining device 23 that determines whether the pulley 3 and the brush portion 12 are in contact with each other will be described. FIG. 7: is a schematic block diagram of the motor for passenger conveyors which attached the electricity supply determination apparatus which concerns on one Example (Example 3) of this invention. About the structure similar to Example 1 and Example 2, the same code | symbol as Example 1 and Example 2 is attached | subjected and description is abbreviate | omitted.

  The energization determination device 23 electrically connects the brush side conductor 17 to the brush portion 12 </ b> A, and also connects the motor shaft side conductor (output shaft side conductor) 18 to the motor shaft (output shaft) 2 or the pulley 3. Further, the energization determining device 23 is provided with an energization determining unit 19 for confirming energization between the brush side conductor 17 and the motor shaft side conductor 18. When the energization determining unit 19 determines that the energization is between the brush side conductor 17 and the motor shaft side conductor 18, the normal lamp 20 is turned on and the energization determining unit 19 is not energized. In this case, the abnormal lamp 21 is turned on. This makes it possible to clearly determine whether the pulley 3 and the brush portion 12A are in contact with each other.

  An energization determination unit 19 provided in the energization determination device 23 constitutes an energization detection unit that detects an energization state (energization and non-energization state) between the brush side conductor 17 and the motor shaft side conductor 18. 23 detects that the neutralization brush 12 and the motor shaft 2 are in contact with each other by the energization determination unit 19 detecting the energization state between the brush side conductor 17 and the motor shaft side conductor 18.

  Further, when it is difficult to electrically connect the motor shaft side conductor 18 to the motor shaft 2 or the pulley 3 that is a rotating body, when the operation 37 of the brake 6 is detected by the brake operation detection device 26, the motor shaft side A configuration in which a conductor connection signal 38 is output and the motor shaft side conductor 18 is electrically connected to the motor shaft 2 by the conductor connection device 27 only when the rotation of the motor shaft 2 and the pulley 3 is stopped when the passenger conveyor is stopped. It is good. In that case, it is set as a condition that the energization determination unit 19 performs the energization determination only at the time of stoppage.

  In addition, when the energization determining unit 19 determines that the energization is not performed, the neutralization brush abnormality signal 39 is transmitted to the outside via the communication device 21 to notify that the neutralization brush 12 is in an abnormal state. Good. Thereby, maintenance work for appropriate position adjustment or replacement of the brush portion 12A can be performed.

  Further, such an energization determination device 23 may be attached only during maintenance work and used for work for confirming contact between the pulley 3 and the brush portion 12A.

  In the present embodiment, the configuration of the energization determination device 23 is added to the first embodiment or the second embodiment, and other configurations are the same as those of the first embodiment or the second embodiment. Therefore, the effects described in the first embodiment or the second embodiment are the same in this embodiment.

  In Examples 1 to 3 described above, the thin static elimination brush 12 can be disposed at a position that does not interfere with the flywheel 11 and contacts the pulley 3.

  The present invention is not limited to the above-described embodiment, and includes various modifications. For example, the above-described embodiment has been described in detail for easy understanding of the present invention, and is not necessarily limited to one having all the configurations described. In addition, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. . Further, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

  DESCRIPTION OF SYMBOLS 1 ... Motor, 2 ... Motor shaft, 3 ... Pulley, 4 ... Drive belt, 5 ... Reducer, 6 ... Brake, 7 ... Drive chain, 8 ... Sprocket, 9 ... Tread board chain, 10 ... Step (tread), 11 ... Flywheel, 12 ... neutralizing brush, 12A ... brush part, 12B ... brush fixing part, 14 ... bracket, 15 ... motor frame part, 16 ... spring, 17 ... brush side conductor, 18 ... motor shaft side conductor, 19 ... energization determination 20, normal lamp, 21, abnormal lamp, 22, communication device, 23, energization determination device, 24, inverter, 25, end bracket, 26, brake operation detection device, 27, conductor connection device.

Claims (5)

A plurality of treads connected endlessly; a motor that circulates and moves the plurality of treads between one boarding gate and the other boarding gate; and an inverter that supplies AC power to the motor. Passenger conveyor with flywheel and pulley attached to the output shaft of
The motor includes a static elimination brush disposed between the side surface on the output shaft side and the flywheel,
The said static elimination brush is arrange | positioned in the state which contacted the said pulley, The passenger conveyor characterized by the above-mentioned. In claim 1,
The motor includes a motor frame that covers an outer periphery, and an end bracket that is provided on a side portion on the output shaft side of the motor frame and forms the side surface.
The flywheel is attached to the output shaft of the motor via the pulley in a state attached to the pulley,
The pulley has an outer peripheral surface exposed between the flywheel and the end bracket;
The said static elimination brush is contacting the said outer peripheral surface of the said pulley, The passenger conveyor characterized by the above-mentioned. In claim 2,
A fixing bolt for fixing the end bracket to the motor frame, and a static elimination brush mounting bracket for attaching the static elimination brush to the motor;
A passenger conveyor, wherein the static elimination brush mounting bracket is fixed to the motor while being fixed to the end bracket by the fixing bolt. In claim 3,
The passenger conveyor is characterized in that the neutralizing brush is attached to the neutralizing brush mounting bracket in a state of being urged by an elastic body in a direction to be pressed against the outer peripheral surface of the pulley. In claim 2,
A current-carrying state between the brush-side conductive wire electrically connected to the static elimination brush, the output shaft-side conductive wire electrically connected to the output shaft or the pulley, and the brush-side conductive wire and the output shaft-side conductive wire A passenger conveyor comprising an energization detection unit for detecting

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