Escalator maintenance work method and slip prevention device

Abstract

To provide a maintenance work method and a fall-off prevention tool that can improve the workability of maintenance work performed on the sloped portion of an escalator. [Solution] The anti-slip device (25) prevents the rotor (15) from coming off together with the rotating shaft (11) of the motor (6) when the cover (19) into which the bearing (14) of the rotating shaft (11) is fitted is removed in the axial direction. The anti-slip device (25) includes a support shaft (35), a first contact portion (36), and a second contact portion (37). The longitudinal length of the support shaft (35) is adjustable. The support shaft (35) supports a compressive load applied in the longitudinal direction. The first contact portion (36) is provided at one end of the support shaft (35). The second contact portion (37) is provided at the other end of the support shaft (35). The first contact portion (36) is pressed against the frame (5). The second contact portion (37) is pressed against the tip of the rotating shaft (11) of the motor (6). When viewed in the longitudinal direction of the support shaft (35), the shape of the second contact portion (37) encompasses the shape of the tip of the rotating shaft (11) that is coaxially arranged.

Description

[Technical Field]

[0001] The present disclosure relates to a maintenance method for an escalator and a fall-out prevention device. [Background technology]

[0002] Patent Document 1 discloses an example of an escalator. The escalator includes steps and a drive unit. The steps move between upper and lower floors. The drive unit is provided on an inclined portion of the escalator. The drive unit includes a motor. The drive unit drives the steps. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-193043 Summary of the Invention [Problem to be solved by the invention]

[0004] During maintenance work on the escalator in Patent Document 1, the motor is removed from the drive unit and transported to the lower floor. However, the task of removing the motor from the drive unit and transporting it on an inclined section places a heavy burden on the worker, and the time required to transport the motor can sometimes extend the work time.

[0005] The present disclosure is directed to solving such problems, and provides a maintenance method and a fall-out prevention tool that can further improve the workability of maintenance work performed on inclined sections of escalators. [Means for solving the problem]

[0006] The rotor slip-out prevention device disclosed herein is a rotor slip-out prevention device that prevents the rotor of a motor from slipping out together with the rotating shaft when the motor cover, into which the bearings of the motor's rotating shaft are fitted, is removed in the axial direction of the motor during maintenance work on an escalator in which a drive device including a motor is installed on an inclined portion, and is equipped with: a support shaft whose length between a first end and a second end, which are both longitudinal ends, is adjustable and which can support a compressive load applied in the longitudinal direction; a first contact portion provided at the first end of the support shaft and pressed against a fixed structure of the escalator; and a second contact portion provided at the second end of the support shaft and having a shape that encompasses the shape of the tip of the rotating shaft, which is arranged coaxially when viewed from the longitudinal direction of the support shaft, and which is pressed against the tip of the rotating shaft.

[0007] The maintenance work method disclosed herein is a maintenance work method for an escalator in which a drive device including a motor is provided on an inclined portion, and includes the steps of adjusting the length between the first end and the second end of the above-mentioned anti-slip device to be shorter than the distance between the fixed structure and the tip of the rotating shaft, adjusting the length between the first end and the second end between the fixed structure and the tip of the rotating shaft to be longer so that the first contact portion is pressed against the fixed structure and the second contact portion is pressed against the tip of the rotating shaft, respectively, and pulling the motor cover in which the bearing is fitted in the axial direction of the motor to remove it. [Effects of the Invention]

[0008] The maintenance work method or fall-out prevention tool disclosed herein can further improve the workability of maintenance work performed on the inclined portions of escalators. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view of an escalator according to a first embodiment. [Figure 2] FIG. 2 is a side view of a step of the escalator according to the first embodiment. [Figure 3] 1 is a perspective view of an escalator drive device according to a first embodiment. [Figure 4] 1 is a schematic top view of an escalator drive device according to a first embodiment. [Figure 5] 1 is a schematic diagram of an escalator maintenance work tool according to a first embodiment. FIG. [Figure 6] 1 is a perspective view of a fall-off prevention tool according to a first embodiment. FIG. [Figure 7] 1 is an enlarged view of a main part of a fall-off prevention tool according to a first embodiment. [Figure 8] FIG. 2 is a perspective view of an auxiliary shaft according to the first embodiment. [Figure 9] FIG. 2 is a perspective view of an auxiliary shaft according to the first embodiment. [Figure 10] 1 is a schematic side view of a drive device according to a first embodiment. [Figure 11] 1 is a schematic side view of a drive device according to a first embodiment. [Figure 12] 1 is a schematic side view of a drive device according to a first embodiment. [Figure 13] 1 is a schematic side view of a drive device according to a first embodiment. [Figure 14] 1 is an enlarged view of a main part of an escalator according to a first embodiment. [Figure 15] 4A and 4B are diagrams showing an example of fixing a sheet-like member using a fixing device according to the first embodiment. [Figure 16] 1 is a schematic top view of a motor according to a first embodiment. [Figure 17] 1 is a schematic top view of a motor according to a first embodiment. [Figure 18] 1 is a schematic top view of a motor according to a first embodiment. [Figure 19] 1 is a schematic top view of a motor according to a first embodiment. [Figure 20] 5A and 5B are diagrams illustrating an example of how the attachment portion according to the first embodiment is attached to a rotary shaft. [Figure 21] 1 is a schematic top view of a motor according to a first embodiment. [Figure 22] 1 is a schematic top view of a motor according to a first embodiment. [Figure 23]10A and 10B are diagrams showing an example of fixing a sheet-like member using a fixing device according to the second embodiment [Figure 24] FIG. 11 is a schematic top view of a motor according to a third embodiment. [Figure 25] FIG. 10 is a schematic top view of a motor according to a fourth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] The following describes embodiments of the subject matter of the present disclosure with reference to the accompanying drawings. In each drawing, identical or corresponding parts are designated by the same reference numerals, and redundant explanations are appropriately simplified or omitted. Note that the subject matter of the present disclosure is not limited to the following embodiments, and any component of the embodiments may be modified or omitted within the scope of the gist of the present disclosure.

[0011] Embodiment 1 FIG. 1 is a perspective view of an escalator 1 according to the first embodiment.

[0012] Escalator 1 spans between the upper and lower floors of a building. The equipment of escalator 1 is supported by a structure such as a truss (not shown). Escalator 1 transports passengers between the upper and lower floors. Entrances and alighting points for escalator 1 are provided on the upper and lower floors of the building. The entrances are the locations where passengers get on and off escalator 1. One entrance is the departure entrance where passengers get on escalator 1. The other entrance is the arrival entrance where passengers get off escalator 1. An inclined slope is provided between both entrances and alighting points of escalator 1. Escalator 1 has a plurality of steps 2 and a drive unit 3.

[0013] The multiple steps 2 move cyclically between both boarding and alighting gates. Each step 2 moves on the outbound route from the departure gate to the arrival gate, and moves on the return route lower than the outbound route from the arrival gate to the departure gate. The multiple steps 2 are arranged in a staircase pattern on the outbound route.

[0014] The drive unit 3 is a device that generates a driving force to move a plurality of steps 2 in a circular motion. The drive unit 3 is arranged on the inclined portion of the escalator 1. The drive unit 3 is arranged below the step 2 that moves on the outward path. The drive unit 3 is arranged above the step 2 that moves on the return path. In this example, the drive unit 3 is arranged inside the track of the step 2 that moves in a circular motion.

[0015] FIG. 2 is a side view of step 2 of escalator 1 according to the first embodiment.

[0016] Each step 2 is attached to a corresponding step shaft 4. The step shaft 4 is a rod-shaped member with its longitudinal direction in the left-right direction. The left-right direction is a direction in a horizontal plane perpendicular to the direction of travel of the escalator 1. Each step shaft 4 moves circulatingly on a track along which the steps 2 move circulatingly, by means of a step chain (not shown). Each step 2 moves circulatingly in conjunction with the circulating movement of the corresponding step shaft 4. The drive unit 3 moves the step shaft 4 circulatingly via the step chain, thereby moving the steps 2 circulatingly.

[0017] FIG. 3 is a perspective view of the drive device 3 of the escalator 1 according to the first embodiment.

[0018] The drive unit 3 includes a frame 5, a motor 6, a brake 7, a reducer 8, and a pulley 9. The frame 5 is a structure to which each device of the drive unit 3 is attached. The frame 5 is an example of a fixed structure of the escalator 1 that is fixed to the escalator 1. The motor 6 is a device that serves as a power source that generates a drive force. The motor 6 is attached to the frame 5. The brake 7 is a device that brakes the motor 6. The brake 7 is attached to the frame 5. The reducer 8 is a device that converts the speed, etc. of the drive force generated by the motor 6 and outputs it. The reducer 8 is attached to the frame 5. The pulley 9 is a device that transmits the drive force generated by the motor 6 to the reducer 8, for example, via a belt 10.

[0019] FIG. 4 is a schematic top view of the drive device 3 of the escalator 1 according to the first embodiment. In the schematic diagrams such as Fig. 4, illustration of devices is omitted or simplified as appropriate. For example, in Fig. 4, illustration of the brake 7 and other devices is omitted as appropriate. Also, in Fig. 4, the reduction gear 8 and other devices are illustrated in an appropriately simplified manner.

[0020] The motor 6 includes a rotating shaft 11 and a main body 12. The main body 12 of the motor 6 includes a casing 13, two bearings 14, and a rotor 15.

[0021] The rotating shaft 11 is a shaft-shaped member whose longitudinal direction is the axial direction. One end of the rotating shaft 11 protrudes from the main body 12 of the motor 6. The rotating shaft 11 is a part that outputs torque generated by the motor 6 as a driving force to the outside by rotating around the axial direction. In this example, the axial direction of the rotating shaft 11 is oriented in the left-right direction of the escalator 1. A key pin 16 is provided at the end of the rotating shaft 11 protruding from the main body 12. The key pin 16 is a mechanical element that more reliably transmits the rotation of the rotating shaft 11. In this example, the key pin 16 is fitted into a key groove provided on the side surface of the end of the rotating shaft 11 and protrudes radially from the side surface of the end of the rotating shaft 11. The pulley 9 is attached to the end of the rotating shaft 11 so as to mesh with the key pin 16. The pulley 9 is fixed to the rotating shaft 11, for example, by fastening a screw 18 into a screw hole 17. The pulley 9 is an example of a rotating body attached to the rotating shaft 11. In the axial direction of the rotary shaft 11, the side to which the pulley 9 is attached may be referred to as the load side. In addition, in the axial direction of the rotary shaft 11, the side opposite to the load side may be referred to as the anti-load side.

[0022] The casing 13 forms the outer shell of the main body 12 of the motor 6. In this example, the casing 13 has a cylindrical shape with its axial direction facing the left-right direction. The casing 13 is attached to the frame 5, for example, near the center of the left-right direction via a base (not shown). The casing 13 includes two covers 19. One cover 19 is a part that forms the outer shell of the main body 12 of the motor 6 on the load side. The other cover 19 is a part that forms the outer shell of the main body 12 of the motor 6 on the anti-load side.

[0023] The two bearings 14 are devices that rotatably support the rotating shaft 11. One bearing 14 supports the rotating shaft 11 on the load side of the center of the rotating shaft 11. The other bearing 14 supports the rotating shaft 11 on the anti-load side of the center of the rotating shaft 11. Each bearing 14 is attached to the rotating shaft 11, for example, by an interference fit. The load-side bearing 14 is attached to the load-side cover 19, for example, by a transition fit. The anti-load side bearing 14 is attached to the anti-load side cover 19, for example, by a transition fit. The attachment of each bearing 14 to the rotating shaft 11 is stronger than the attachment to the cover 19.

[0024] The rotor 15 is a device that rotates by an electromagnetic force generated between the rotor 15 and a stator (not shown) that is fixed inside the casing 13. The rotor 15 rotates together with the rotary shaft 11.

[0025] The pulley 9 transmits the driving force generated by the motor 6 by the electromagnetic force between the rotor 15 and the stator to the reducer 8 via the belt 10. The pulley 9 includes a flywheel 20 and a belt loop 21. The flywheel 20 is a mechanical element that stabilizes the rotational speed of the pulley 9 by the moment of inertia. The belt loop 21 is a portion around which the belt 10 that transmits the driving force to the reducer 8 is looped.

[0026] Maintenance work such as replacing bearings 14 of motor 6 may be performed on escalator 1. At this time, a worker performs the maintenance work on the inclined portion of escalator 1 using maintenance work tools 22 and the like not shown in FIG.

[0027] FIG. 5 is a schematic diagram of a maintenance work tool 22 for the escalator 1 according to the first embodiment.

[0028] The maintenance work tool 22 includes a fall prevention tool 23, a puller 24, a drop prevention tool 25, and an auxiliary shaft 26.

[0029] Fall prevention devices 23 are devices that prevent parts or tools from falling onto the truss of escalator 1 during maintenance work on the inclined section. In this example, two fall prevention devices 23 are used. Fall prevention devices 23 include a sheet-like member 27 and a plurality of fasteners 28. Sheet-like member 27 is a flexible, planar member such as a net or cloth. When sheet-like member 27 is a member with holes such as a net, the size of the holes is smaller than the size of the tools or parts used in the maintenance work. For example, when small parts such as M8 spring washers are attached or removed during maintenance work, a sheet-like member 27 with no larger holes is used. In this example, sheet-like member 27 is rectangular. Sheet-like member 27 has a front edge 29 and a rear edge 30. Front edge 29 is the edge of sheet-like member 27 that is positioned at the front when fall prevention device 23 is in use. The rear edge portion 30 is the edge of the sheet-shaped member 27 that is positioned on the rear side when the fall prevention device 23 is in use. In this example, the front edge portion 29 corresponds to one side of the rectangular sheet-shaped member 27. In this case, the rear edge portion 30 corresponds to the opposite side of that side of the rectangular sheet-shaped member 27. The multiple fasteners 28 are devices that fasten the sheet-shaped member 27 to the escalator 1 when the fall prevention device 23 is in use. Some of the fasteners 28 fasten the front edge portion 29 of the sheet-shaped member 27. These fasteners 28 are examples of front fasteners. Other fasteners 28 fasten the rear edge portion 30 of the sheet-shaped member 27. These fasteners 28 are examples of rear fasteners.

[0030] The puller 24 is a tool used to remove the pulley 9 from the motor 6. The puller 24 includes multiple arms 31 and a puller shaft 32. The puller shaft 32 is disposed at the center of the puller 24. An adapter 33 is provided at the tip of the puller shaft 32, which is adapted to engage with the object to be removed, such as the pulley 9. The arms 31 are disposed at radially spaced positions on the puller shaft 32. The multiple arms 31 are disposed rotationally symmetrically about the central axis of the puller shaft 32. A claw 34 is provided at the tip of each arm 31, which is adapted to engage with the object to be removed, such as the pulley 9. The distance between the adapter 33 and the claw 34 in the axial direction of the puller shaft 32 can be adjusted using a screw or the like provided on the puller shaft 32. The minimum length of the puller 24 in the axial direction of the puller shaft 32 is shorter than the distance between the rotation shaft 11 of the motor 6 and the frame 5. The minimum length of the puller 24 in the axial direction of the puller shaft 32 is, for example, the length of the puller shaft 32. In this example, the length of each arm 31 in the axial direction of the puller shaft 32 is shorter than the axial length of the puller shaft 32.

[0031] The anti-slip device 25 is a device that prevents the rotor 15 from coming off together with the rotating shaft 11 when the cover 19 of the motor 6 is removed in the axial direction of the motor 6. The anti-slip device 25 includes a support shaft 35, a first contact portion 36, and a second contact portion 37. The support shaft 35 is a portion that supports a compressive load in the longitudinal direction of the anti-slip device 25. The longitudinal length of the support shaft 35 is adjustable. The first contact portion 36 is provided at one end of the support shaft 35. The second contact portion 37 is provided at the other end of the support shaft 35. The first contact portion 36 is a portion that comes into contact with a fixed structure of the escalator 1 when the anti-slip device 25 is in use. The fixed structure of the escalator 1 may be, for example, the frame 5 of the drive unit 3, a truss, or another building structure. The second contact portion 37 is a portion that comes into contact with the rotating shaft 11 when the anti-slip device 25 is in use.

[0032] The auxiliary shaft 26 is a tool used when attaching the pulley 9 to the motor 6. The auxiliary shaft 26 includes a body portion 38 and an attachment portion 39. The body portion 38 is a portion that is rotationally symmetric about the axial direction. The body portion 38 has, for example, a cylindrical shape. The attachment portion 39 is a portion that is attached to the tip of the rotating shaft 11 of the motor 6 when the auxiliary shaft 26 is in use. The attachment portion 39 is provided at one end of the body portion 38 along the axis of symmetry.

[0033] FIG. 6 is a perspective view of the fall-off prevention tool 25 according to the first embodiment.

[0034] The support shaft 35 has a male threaded portion 40 and a female threaded portion 41. The male threaded portion 40 is, for example, a bolt. The female threaded portion 41 is the portion with which the bolt portion of the male threaded portion 40 engages. In this example, the male threaded portion 40 is provided on the support shaft 35 on the side of the second contact portion 37. The female threaded portion 41 is provided on the support shaft 35 on the side of the first contact portion 36. The longitudinal length of the support shaft 35 is adjusted by fastening the male threaded portion 40 and the female threaded portion 41.

[0035] A first anti-slip surface 42 is provided at the first contact portion 36. The first anti-slip surface 42 comes into contact with the fixed structure of the escalator 1 and prevents the support shaft 35 from slipping in a direction perpendicular to the longitudinal direction of the support shaft 35, i.e., in the in-plane direction of the contact surface of the fixed structure. The first anti-slip surface 42 is formed of, for example, deformable rubber. The first anti-slip surface 42 may be provided with a groove or the like.

[0036] FIG. 7 is an enlarged view of a main part of the fall-off prevention tool 25 according to the first embodiment. In FIG. 7, an enlarged view of the second contact portion 37 is shown.

[0037] A second anti-slip surface 43 is provided on the second contact portion 37. The second anti-slip surface 43 comes into contact with the tip of the rotating shaft 11 of the motor 6 and prevents the support shaft 35 from slipping in a direction perpendicular to the longitudinal direction of the support shaft 35. The second anti-slip surface 43 is formed of, for example, deformable rubber. The second anti-slip surface 43 may be provided with a groove or the like. The shape of the second contact portion 37 is a shape that encompasses the shape of the tip of the rotating shaft 11 when viewed from the longitudinal direction of the support shaft 35 when the support shaft 35 and the rotating shaft 11 are arranged coaxially. The shape of the second contact portion 37 is, for example, a cylindrical shape with a diameter larger than the diameter of the rotating shaft 11.

[0038] 8 and 9 are perspective views of the auxiliary shaft 26 according to the first embodiment.

[0039] As shown in Fig. 8, the body 38 may be hollow, for example. Also, as shown in Fig. 9, the attachment portion 39 is, for example, a bolt.

[0040] 10 to 22, an example of maintenance work on the escalator 1 using the maintenance work tool 22 will be described. In this example, the maintenance work involves replacing the bearing 14 of the motor 6. 10 to 13 are schematic side views of the driving device 3 according to the first embodiment. FIG. 14 is an enlarged view of a main part of the escalator 1 according to the first embodiment. FIG. 15 is a diagram showing an example of fixing of sheet-like member 27 by fixing device 28 according to the first embodiment. 16 to 19, 21, and 22 are schematic top views of the motor 6 according to the first embodiment. FIG. 20 is a diagram showing an example of how the attachment portion 39 according to the first embodiment is attached to the rotary shaft 11. In FIG.

[0041] 10, the plurality of steps 2 move in a circular fashion above the drive device 3. A worker performing maintenance work moves the plurality of steps 2 using the drive device 3 via a control panel or the like (not shown).

[0042] Next, as shown in FIG. 11 , the worker removes at least two steps 2 adjacent to each other in the direction of travel of the escalator 1 above the motor 6 from the step shaft 4. For example, if the steps 2 to be removed from the step shaft 4 are predetermined, the worker may remove the steps 2 from the step shaft 4 after moving them above the motor 6. If the steps 2 to be removed from the step shaft 4 are not predetermined, the worker may remove the step 2 located above the motor 6 from the step shaft 4. The worker may remove three or more steps 2 from the step shaft 4.

[0043] Next, as shown in FIG. 12 , the worker adjusts the position of the step shaft 4 in the direction of travel of the escalator 1 so that the motor 6 is located between the adjacent step shafts 4 from which the steps 2 have been removed. The worker moves the step shaft 4 using the drive device 3, for example, via a control panel (not shown). The worker then stops the drive device 3 so that maintenance work on the motor 6 can be performed. The worker then removes the belt 10 from the pulley 9. Of the adjacent step shafts 4 from which the steps 2 have been removed, the step shaft 4 located in front of the motor 6 is an example of a front step shaft. Also, of the adjacent step shafts 4 from which the steps 2 have been removed, the step shaft 4 located behind the motor 6 is an example of a rear step shaft.

[0044] Next, as shown in FIG. 13 , the worker attaches the fall prevention device 23 to the step shaft 4. The worker hangs the center portion of the sheet-like member 27 on the underside of the motor 6. The center portion of the sheet-like member 27 is, for example, the intermediate portion between the leading edge portion 29 and the trailing edge portion 30. The worker fixes the leading edge portion 29 to the step shaft 4 in front of the motor 6 using some of the fasteners 28. The worker fixes the trailing edge portion 30 to the step shaft 4 behind the motor 6 using other parts of the fasteners 28. The worker may fix the trailing edge portion 30 before fixing the leading edge portion 29, or may fix the leading edge portion 29 and the trailing edge portion 30 in parallel. The worker may fix either the leading edge portion 29 or the trailing edge portion 30, and then hang the center portion of the sheet-like member 27 on the underside of the motor 6.

[0045] Here, the length of the sheet-like member 27 in the front-rear direction from the leading edge 29 to the trailing edge 30 along the sheet-like member 27 is a length that does not sag between the motor 6 and the front and rear step shafts 4 when the fall prevention device 23 is fixed to the step shafts 4. Note that the length of the sheet-like member 27 in the front-rear direction may be any length that does not cause the sheet-like member 27 to sag and move and interfere with maintenance work, and a gap that ensures ease of maintenance work may be provided between the casing 13 and the sheet-like member 27. The length of the sheet-like member 27 from the leading edge 29 to the trailing edge 30 along the sheet-like member 27 is, for example, the length of the other sides of the leading edge 29 and the trailing edge 30 when the sheet-like member 27 is rectangular.

[0046] FIG. 14 shows an example of the motor 6 and step shafts 4 as viewed from the left and right. The two step shafts 4 are positioned in front of and behind the motor 6 so that fall prevention devices 23 can be attached. FIG. 14 also shows a line segment L1, which is a common tangent to the side surface of the casing 13 of the front step shaft 4 and the motor 6, and a line segment L2, which is a common tangent to the side surface of the casing 13 of the rear step shaft 4 and the motor 6. The line segment L1 is tangent to the side surface of the casing 13 at a tangent point P1. The line segment L2 is tangent to the side surface of the casing 13 at a tangent point P2. The length of the sheet-like member 27 in the front-to-rear direction from the front edge 29 to the rear edge 30 along the sheet-like member 27 corresponds to the sum of the length of the line segment L1, the length on the side surface of the casing 13 between the tangent points P1 and P2, and the length of the line segment L2. The tangent line L1 may be tangent to either the rear side or the front side of the front step shaft 4. Furthermore, the tangent line L2 may be tangent to the front side of the rear step shaft 4 or may be tangent to the rear side.

[0047] FIG. 15 shows an example of fastening the sheet-like member 27 with the fastener 28. The fastener 28 is, for example, a cable tie. For example, the worker hangs the front edge portion 29 of the sheet-like member 27 on the step shaft 4, and then fastens the sheet-like member 27 and the step shaft 4 together with the fastener 28. If the sheet-like member 27 is a member having holes, such as a net, the fastener 28 is passed through the holes, for example. If the sheet-like member 27 is made of cloth or the like, holes through which the fastener 28 is passed may be provided in the sheet-like member 27 near the front edge portion 29. The fastener 28 may be, for example, a wire. The worker also fastens the rear edge portion 30 of the sheet-like member 27 to the step shaft 4 in a similar manner.

[0048] As shown in FIG. 16 , the worker secures fall prevention devices 23 to the left and right sides of the motor 6. The left side of the motor 6 is, for example, the left side of the base to which the motor 6 is attached to the frame 5. Similarly, the right side of the motor 6 is, for example, the right side of the base. One of the left and right sides of the motor 6 faces, for example, toward the load side. The other of the left and right sides of the motor 6 faces the anti-load side. In this example, the left side of the motor 6 faces toward the load side. The left sheet-like member 27 on the load side covers the area from below, from a position to the right of the left cover 19, to a position to the left of the left tip of the left side of the rotating shaft 11. The right sheet-like member 27 on the anti-load side covers the area from below, from a position to the left of the right cover 19, to a position to the right of the cover 19.

[0049] The front edge 29 of the sheet-like member 27 is fixed by fasteners 28 at two points spaced apart in the left-right direction. In this example, the front edge 29 is fixed to the front step shaft 4 at two points by two fasteners 28. The left sheet-like member 27, which is the load side, is fixed at two points: one to the right of the left cover 19 and one to the left of the left tip of the rotating shaft 11. The right sheet-like member 27, which is the anti-load side, is fixed at two points: one to the left of the right cover 19 and one to the right of said cover 19. Similarly, the rear edge 30 of the sheet-like member 27 is fixed by fasteners 28 at two points spaced apart in the left-right direction.

[0050] After securing the fall prevention device 23, the worker removes the screw 18 securing the pulley 9. Then, as shown in FIG. 17, the worker hooks the claw 34 of the arm 31 of the puller 24 onto the anti-load side of the pulley 9. The worker also places the adapter 33 of the puller shaft 32 on the tip of the rotating shaft 11. The worker presses the adapter 33 against the tip of the rotating shaft 11 using a screw or the like provided on the puller shaft 32. At this time, the claw 34 of the puller 24 pulls the pulley 9 toward the adapter 33, and the pulley 9 is removed from the rotating shaft 11 as shown in FIG. 18.

[0051] The worker then installs the anti-slip device 25 as shown in FIG. 19 . The worker adjusts the length between the first contact portion 36 and the second contact portion 37 by using the male thread portion 40 and the female thread portion 41 of the support shaft 35 so that it is shorter than the gap g between the frame 5 and the tip of the rotating shaft 11. The worker then places the anti-slip device 25 between the frame 5 and the tip of the rotating shaft 11 so that the support shaft 35 and the rotating shaft 11 are coaxially arranged. The worker then uses the male thread portion 40 and the female thread portion 41 of the support shaft 35 to increase the length between the first contact portion 36 and the second contact portion 37, thereby pressing the first anti-slip device 42 of the first contact portion 36 against the frame 5 and the second anti-slip device 43 of the second contact portion 37 against the tip of the rotating shaft 11. At this time, the support shaft 35 supports the compressive load applied in the longitudinal direction, thereby suppressing axial movement of the rotating shaft 11.

[0052] The worker then removes the load-side cover 19 by pulling it in the axial direction of the rotating shaft 11. At this time, the axial movement of the rotating shaft 11 is prevented by the fall-off prevention tool 25, so the load-side bearing 14 and the rotating shaft 11 are prevented from moving together with the load-side cover 19. This prevents the rotor 15 from being pulled out together with the rotating shaft 11. After removing the load-side cover 19, the worker removes the fall-off prevention tool 25 from between the frame 5 and the end of the rotating shaft 11. Because the rotor 15 remains inside the casing 13 when the cover 19 is removed, a space is secured between the main body 12 of the motor 6 and the frame 5. This improves the workability of maintenance work such as replacing the bearing 14.

[0053] The worker replaces the load-side bearing 14 after removing the load-side cover 19. The worker may replace the non-load-side bearing 14 in the same manner. Note that the worker may replace the non-load-side bearing 14 while the pulley 9 is still attached to the load side, for example, before removing the pulley 9 from the load side. After replacing the load-side bearing 14, the worker reattaches the load-side cover 19 of the motor 6.

[0054] Thereafter, the worker reattaches the pulley 9 to the load side. As shown in FIG. 20 , the worker attaches the auxiliary shaft 26 to the tip of the rotating shaft 11. The worker attaches the auxiliary shaft 26 by fastening the attachment portion 39, which is, for example, a bolt, into the screw hole 17 at the tip of the rotating shaft 11 where the screw 18 was attached. At this time, the auxiliary shaft 26 and the rotating shaft 11 are arranged coaxially.

[0055] 21 , the diameter dr of the rotating shaft 11 is larger than the diameter ds of the trunk portion 38. In this example, the diameter dr of the rotating shaft 11 is larger than the diameter ds of the trunk portion 38 by about 1 mm. Therefore, the shape of the trunk portion 38 is contained within the shape of the tip of the rotating shaft 11 when viewed in the axial direction of the rotating shaft 11. Furthermore, the diameter ds of the end of the trunk portion 38 opposite the mounting portion 39 is smaller than the diameter dr of the rotating shaft 11. The mounting portion 39 is attached by fastening to the screw hole 17, and therefore the end of the trunk portion 38 on the mounting portion 39 side is in contact with the tip of the rotating shaft 11.

[0056] 22, the worker inserts the pulley 9 into the auxiliary shaft 26 attached to the tip of the rotating shaft 11. Because the diameter of the tip of the auxiliary shaft 26 is smaller than the diameter of the rotating shaft 11, the worker can easily insert the pulley 9. Furthermore, because the body 38 of the auxiliary shaft 26 is rotationally symmetric, the worker can insert the pulley 9 regardless of the difference in the rotation angle between the pulley 9 and the rotating shaft 11. Furthermore, the length x of the body 38 in the axial direction is longer than the thickness t along the axial direction from the surface of the pulley 9 on the main body 12 side of the motor 6 to the center of gravity G of the pulley 9. Therefore, the worker can rest the weight of the pulley 9 on the auxiliary shaft 26.

[0057] The worker then rotates the pulley 9 on the body 38 of the auxiliary shaft 26 to align the pulley 9 so that it will mesh with the key pin 16. The worker then moves the aligned pulley 9 in the axial direction to attach the pulley 9 to the rotating shaft 11 so that it meshes with the key pin 16. The worker then removes the auxiliary shaft 26 from the rotating shaft 11. The worker then fixes the pulley 9 to the rotating shaft 11 by tightening the screw 18 into the screw hole 17.

[0058] The worker then removes fall prevention equipment 23 from step shaft 4. The worker puts belt 10 on pulley 9. The worker then reattaches step 2 that was removed to step shaft 4. The worker then checks the operation of escalator 1, and completes the maintenance work.

[0059] As described above, fall prevention device 23 according to the first embodiment is used in maintenance work on escalator 1 in which drive device 3 including motor 6 is provided on an inclined portion. Fall prevention device 23 includes flexible sheet-like member 27 and multiple fasteners 28. Sheet-like member 27 has a leading edge 29 and a trailing edge 30. When step shafts 4 are located in front of and behind motor 6, multiple fasteners 28 fasten leading edge 29 and trailing edge 30 of sheet-like member 27 to the front and rear step shafts 4. The length from leading edge 29 to trailing edge 30 along sheet-like member 27 is such that sheet-like member 27 does not sag between motor 6 and front and rear step shafts 4 when sheet-like member 27 is hung on the underside of motor 6 and fastened with fasteners 28.

[0060] During maintenance work on the motor 6, tools or parts may fall from the worker's hand during the work. When performing maintenance work on an inclined surface, if a tool or part falls from the worker's hand and falls into a structure such as a truss, the worker's workload increases and the work time increases due to the need to search for the fallen object. In response to this issue, the fall prevention device 23 covers the motor 6 from below with the sheet-like member 27, preventing tools or parts from falling into the structure such as a truss. Therefore, even when working on an inclined surface, even if a worker drops a tool or part, the likelihood of the maintenance work increasing workload and the work time being prolonged is reduced. Furthermore, the fall prevention device 23 is attached to the step shafts 4 at the front and rear of the motor 6. Therefore, the work of removing the step 2 and aligning the step shafts 4 at the front and rear of the motor 6 to secure space for maintenance work on the motor 6 also involves aligning the step shafts 4 in a position where the fall prevention device 23 can be stably attached. This allows for easy installation and removal of the sheet-like member 27 of the fall prevention device 23. This will further improve the workability of maintenance work.

[0061] In addition, one or both of the front edge 29 and the rear edge 30 of the sheet-like member 27 are fixed by fasteners 28 at two points spaced apart in the left-right direction. This configuration allows the sheet-like member 27 to be fixed more stably without tilting. Furthermore, the sheet-like member 27 is tensioned with greater force at the left and right portions where the two fasteners 28 are provided than at the center portion between the two fasteners 28. This makes it easier for tools, parts, etc. to gather from the left and right portions to the center portion on the sheet-like member 27. This makes it easier to find and retrieve tools, parts, etc. on the sheet-like member 27.

[0062] Furthermore, the anti-slip device 25 according to the first embodiment prevents the rotor 15 from coming off together with the rotating shaft 11 when the cover 19, into which the bearing 14 of the rotating shaft 11 of the motor 6 is fitted, is removed in the axial direction during maintenance of the escalator 1. The anti-slip device 25 includes a support shaft 35, a first contact portion 36, and a second contact portion 37. The longitudinal length of the support shaft 35 is adjustable. The support shaft 35 supports a compressive load applied in the longitudinal direction. The first contact portion 36 is provided at one end of the support shaft 35. The second contact portion 37 is provided at the other end of the support shaft 35. The first contact portion 36 is pressed against the frame 5. The second contact portion 37 is pressed against the tip of the rotating shaft 11 of the motor 6. When viewed in the longitudinal direction of the support shaft 35, the shape of the second contact portion 37 encompasses the shape of the tip of the rotating shaft 11, which is arranged coaxially with the support shaft 35.

[0063] The size of the space in the inclined portion is limited, and workers cannot completely remove the rotor 15 and rotating shaft 11 from the casing 13 to perform maintenance work in the inclined portion. Therefore, if the rotor 15 partially comes out of the casing 13, additional work such as returning the rotor 15 to the casing 13 may be required. In this regard, the anti-slip tool 25 prevents the rotating shaft 11 from moving in the axial direction when the cover 19 in which the bearing 14 of the rotating shaft 11 of the motor 6 is fitted is removed in the axial direction. This prevents the rotor 15 from coming out of the casing 13 together with the rotating shaft 11. Therefore, even when work is performed in an inclined portion, the possibility of an increase in the workload of the maintenance work and a prolonged work time is reduced.

[0064] Additionally, first contact portion 36 is provided with first anti-slip member 42 that comes into contact with frame 5. Additionally, second contact portion 37 is provided with second anti-slip member 43 that comes into contact with the tip of rotating shaft 11. First anti-slip member 42 and second anti-slip member 43 prevent first contact portion 36 and second contact portion 37 from slipping in a direction perpendicular to the longitudinal direction of support shaft 35. This configuration prevents slippage prevention device 25 from shifting in a direction perpendicular to the axial direction when cover 19 is removed in the axial direction. This allows maintenance work on escalator 1 to be performed more efficiently.

[0065] Furthermore, the support shaft 35 includes a male thread portion 40 on one side in the longitudinal direction and a female thread portion 41 on the other side in the axial direction. The longitudinal length of the support shaft 35 is adjusted by fastening the male thread portion 40 and the female thread portion 41. With this configuration, it is possible to easily adjust the longitudinal length of the support shaft 35 and also to support a compressive load applied in the longitudinal direction.

[0066] Furthermore, in the escalator 1, the auxiliary shaft 26 according to the first embodiment assists in the attachment of the pulley 9, which is attached to the rotating shaft 11 of the motor 6 so as to mesh with the key pin 16. The auxiliary shaft 26 includes an attachment portion 39 and a body portion 38. The attachment portion 39 is attached to the tip of the rotating shaft 11 of the motor 6. The body portion 38 is rotationally symmetrical about the axial direction of the rotating shaft 11. When the body portion 38 is attached to the rotating shaft 11 by the attachment portion 39 provided at one end of the symmetry axis, the shape of the body portion 38 is contained within the shape of the tip of the rotating shaft 11 when viewed in the axial direction of the rotating shaft 11. The end of the body portion 38 on the side of the attachment portion 39 contacts the tip of the rotating shaft 11. The diameter of the end of the body portion 38 opposite the attachment portion 39 is smaller than the diameter of the rotating shaft 11.

[0067] With this configuration, the worker can temporarily rest the weight of the pulley 9 on the auxiliary shaft 26. Because the auxiliary shaft 26 is axially symmetric, the worker can insert the pulley 9 regardless of the orientation. This allows the worker to separately perform the tasks of keeping the pulley 9, which can be a heavy load, at the height of the rotating shaft 11 and aligning the orientation of the pulley 9 with the key pin 16. Therefore, the worker does not need to perform the burdensome task of aligning the orientation of the pulley 9 with the key pin 16 while lifting the pulley 9 to the height of the rotating shaft 11 on an inclined portion where the working space is limited. Therefore, even when working on an inclined portion, the possibility of an increase in the workload of the maintenance work and a prolonged work time can be reduced.

[0068] Furthermore, the length of body 38 in the axial direction of rotating shaft 11 is longer than the length along the axial direction of rotating shaft 11 from the surface of pulley 9 on the main body 12 side of motor 6 to the center of gravity of pulley 9. This allows auxiliary shaft 26 to more stably support the load of pulley 9. This allows maintenance work on escalator 1 to be performed more efficiently.

[0069] Embodiment 2 In the second embodiment, differences from the example disclosed in the first embodiment will be described in particular detail. For features not described in the second embodiment, any of the features of the example disclosed in the first embodiment may be adopted.

[0070] FIG. 23 is a diagram showing an example of fixing of sheet-like member 27 by fixing device 28 according to the second embodiment.

[0071] In this example, the fastener 28 is a ring-shaped or cylindrical elastic body having a slit 44. The fastener 28 is attached to the front edge 29 or the rear edge 30 of the sheet-like member 27.

[0072] For example, the worker presses the step shaft 4 in front of the motor 6 against the edge of the slit 44 of the fixture 28 attached to the front edge 29 of the sheet-like member 27. The width of the slit 44 of the fixture 28 expands to approximately the diameter of the step shaft 4 due to elastic deformation. This allows the step shaft 4 to pass through the slit 44 of the fixture 28. After the step shaft 4 passes through the slit 44, the width of the slit 44 of the fixture 28 narrows to be smaller than the diameter of the step shaft 4 due to elastic deformation. This allows the worker to easily fix the fixture 28 to the step shaft 4. The worker also fixes the rear edge 30 of the sheet-like member 27 to the step shaft 4 in a similar manner.

[0073] With this configuration, workers can secure fall prevention device 23 by pressing the edge of slit 44 of fixing device 28 against step shaft 4. Since no tools or the like are required to secure fall prevention device 23, workers can perform maintenance work on escalator 1 more efficiently.

[0074] Embodiment 3 In the third embodiment, differences from the examples disclosed in the first or second embodiment will be described in particular detail. For features not described in the third embodiment, any of the features of the examples disclosed in the first or second embodiment may be adopted.

[0075] FIG. 24 is a schematic top view of the motor 6 according to the third embodiment.

[0076] In this example, the second contact portion 37 of the fall-out prevention tool 25 is a cap that is fitted onto the tip of the rotating shaft 11. Note that the second contact portion 37 may be fitted onto the tip of the rotating shaft 11 from which the key pin 16 has been removed, or may be fitted onto the tip of the rotating shaft 11 to which the key pin 16 has been attached.

[0077] This configuration more reliably prevents slippage of prevention device 25 in a direction perpendicular to the axial direction when cover 19 is removed in the axial direction, thereby enabling maintenance work on escalator 1 to be performed more efficiently.

[0078] Embodiment 4 In the fourth embodiment, differences from the examples disclosed in the first to third embodiments will be described in particular detail. For features not described in the fourth embodiment, any of the features of the examples disclosed in the first to third embodiments may be adopted.

[0079] FIG. 25 is a schematic top view of the motor 6 according to the fourth embodiment.

[0080] In this example, the body 38 of the auxiliary shaft 26 has a tapered shape in which the diameter decreases from the mounting portion 39 side toward the opposite side of the mounting portion 39. This configuration makes it easier to insert the pulley 9 into the auxiliary shaft 26. This allows maintenance work on the escalator 1 to be performed more efficiently.

[0081] To summarize the above explanation, possible configurations of the technology according to the present disclosure include the configurations listed below as appendices. (Appendix 1) A rotor removal prevention tool that prevents the rotor of the motor from coming off together with the rotating shaft when the motor cover, into which the bearing of the rotating shaft of the motor is fitted, is removed in the axial direction of the motor during maintenance work on an escalator in which a drive device including a motor is provided on an inclined portion, a support shaft having an adjustable length between a first end and a second end, which are both ends in the longitudinal direction, and capable of supporting a compressive load applied in the longitudinal direction; a first contact portion provided at the first end of the support shaft and pressed against a fixed structure of the escalator; a second contact portion provided at the second end of the support shaft, the second contact portion having a shape that encompasses the shape of the tip of the rotating shaft that is coaxially arranged when viewed from the longitudinal direction of the support shaft, and the second contact portion being pressed against the tip of the rotating shaft; A device to prevent slippage. (Appendix 2) The first contact portion is provided with a non-slip portion that comes into contact with the fixed structure and prevents the first contact portion from slipping in a direction perpendicular to the longitudinal direction of the support shaft. The fall-out prevention device described in Appendix 1. (Appendix 3) The second contact portion is provided with a non-slip member that comes into contact with the tip of the rotating shaft and prevents the second contact portion from slipping in a direction perpendicular to the longitudinal direction of the support shaft. A fall-out prevention device as described in Appendix 1 or Appendix 2. (Appendix 4) The second contact portion is a cap that is placed on the tip of the rotating shaft. A fall-out prevention device according to any one of appendices 1 to 3. (Appendix 5) the support shaft includes a male screw portion on one side of the first end or the second end, and a female screw portion on the other side of the first end or the second end, and the length between the first end and the second end is adjusted by fastening the male screw portion and the female screw portion. A fall-out prevention device according to any one of appendices 1 to 4. (Appendix 6) A maintenance work method for an escalator in which a drive device including a motor is provided on an inclined portion, adjusting a length between the first end and the second end of the fall-out prevention tool according to any one of Supplementary Note 1 to Supplementary Note 5 to be shorter than a distance between the fixed structure and the tip of the rotating shaft; adjusting a length between the first end and the second end between the fixed structure and the tip of the rotating shaft to be longer, so that the first contact portion is pressed against the fixed structure and the second contact portion is pressed against the tip of the rotating shaft; removing the motor cover in which the bearing is fitted by pulling it in the axial direction of the motor; A maintenance work method comprising: [Explanation of symbols]

[0082] 1 escalator, 2 step, 3 drive unit, 4 step shaft, 5 frame, 6 motor, 7 brake, 8 reducer, 9 pulley, 10 belt, 11 rotating shaft, 12 main body, 13 casing, 14 bearing, 15 rotor, 16 key pin, 17 screw hole, 18 screw, 19 cover, 20 flywheel, 21 belt hook, 22 maintenance work tool, 23 fall prevention device, 24 puller, 25 slip-out prevention device, 26 auxiliary shaft, 27 sheet-shaped member, 28 fixing device, 29 front edge portion, 30 rear edge portion, 31 arm, 32 puller shaft, 33 adapter, 34 claw, 35 support shaft, 36 first contact portion, 37 second contact portion, 38 Body portion, 39 mounting portion, 40 male thread portion, 41 female thread portion, 42 first anti-slip portion, 43 second anti-slip portion, 44 slit

Claims

1. A rotor removal prevention tool that prevents the rotor of the motor from coming off together with the rotating shaft when the motor cover, into which the bearing of the rotating shaft of the motor is fitted, is removed in the axial direction of the motor during maintenance work on an escalator in which a drive device including a motor is provided on an inclined portion, a support shaft having an adjustable length between a first end and a second end, which are both ends in the longitudinal direction, and capable of supporting a compressive load applied in the longitudinal direction; a first contact portion provided at the first end of the support shaft and pressed against a fixed structure of the escalator; a second contact portion provided at the second end of the support shaft, the second contact portion having a shape that encompasses the shape of the tip of the rotating shaft that is coaxially arranged when viewed from the longitudinal direction of the support shaft, and the second contact portion being pressed against the tip of the rotating shaft; A device to prevent slippage.

2. a non-slip portion is provided in the first contact portion, the non-slip portion contacting the fixed structure and preventing the first contact portion from slipping in a direction perpendicular to the longitudinal direction of the support shaft; The fall-out prevention tool according to claim 1.

3. The second contact portion is provided with a non-slip portion that comes into contact with the tip of the rotating shaft and prevents the second contact portion from slipping in a direction perpendicular to the longitudinal direction of the support shaft. The fall-out prevention tool according to claim 1 or 2.

4. the second contact portion is a cap that is placed on the tip of the rotating shaft, The fall-out prevention tool according to claim 1 or 2.

5. the support shaft includes a male screw portion on one side of the first end or the second end, and a female screw portion on the other side of the first end or the second end, and the length between the first end and the second end is adjusted by fastening the male screw portion and the female screw portion. The fall-out prevention tool according to claim 1 or 2.

6. A maintenance work method for an escalator in which a drive device including a motor is provided on an inclined portion, adjusting a length between the first end and the second end of the fall-off prevention tool according to claim 1 or 2 to be shorter than a distance between the fixed structure and the tip of the rotating shaft; adjusting a length between the first end and the second end between the fixed structure and the tip of the rotating shaft to be longer, so that the first contact portion is pressed against the fixed structure and the second contact portion is pressed against the tip of the rotating shaft; removing the motor cover in which the bearing is fitted by pulling it in the axial direction of the motor; A maintenance work method comprising:

Images