JP6797080B2 - How to check the safety device for passenger conveyors and the safety device for passenger conveyors - Google Patents

Description

The present invention relates to a passenger conveyor safety device that stops the movement of steps when a passenger conveyor such as an escalator or a moving walkway is abnormal, and a method for inspecting a passenger conveyor safety device.

Conventionally, the stopper member and the arm are fixed to the connecting shaft rotatably supported by the truss, and the shoe attached to the arm is placed on the drive chain to keep the stopper member detached from the ratchet wheel and the drive chain is broken. There is known a safety device for a passenger conveyor that forcibly stops the movement of the step by rotating the connecting shaft by the weight of the shoe and engaging the stopper member with the ratchet wheel. In such a conventional safety device for a passenger conveyor, the stopper member is fixed to the connecting shaft by a bolt in order to facilitate the adjustment of the attachment angle of the stopper member with respect to the connecting shaft (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2008-21408

When checking the operation of the conventional safety device for passenger conveyors shown in Patent Document 1, the shoe must be removed from the arm so that the stopper member engages with the ratchet wheel even when the drive chain is not broken. Therefore, it takes time and effort to check the operation of the safety device for the passenger conveyor.

The present invention has been made to solve the above problems, and an object of the present invention is to obtain an inspection method for a passenger conveyor safety device and a passenger conveyor safety device that can facilitate inspection work. To do.

The passenger conveyor safety device according to the present invention is fixed to a rotatable connecting shaft arranged parallel to the axis of the drive sprocket, a shoe mounted on a drive chain wound around the drive sprocket, and a connecting shaft. The arm connected to the shoe, the ratchet wheel that rotates integrally with the drive sprocket, and the displacement position that is fixed to the connecting shaft and disengages from the ratchet wheel due to the rotation of the connecting shaft and the meshing position that meshes with the ratchet wheel. The shoe is provided with a ratchet pole to be rotatable about a shoe shaft provided on the arm, and the shoe is provided with different first and second surfaces, which are the axes of the shoe shaft. The first distance from the first surface to the first surface is larger than the second distance from the axis of the shoe shaft to the second surface, and the ratchet pole brings the first surface into contact with the drive chain. When the shoe is placed on the drive chain, it is kept in the release position, and when the second surface faces the drive chain, the meshing position can be reached.

According to the inspection method of the passenger conveyor safety device and the passenger conveyor safety device according to the present invention, even when the drive chain is not broken, the ratchet is simply performed by turning the shoe so that the second surface faces the drive chain. The poles can be made reachable in the meshing position. As a result, it is not necessary to remove the shoe from the arm in order to displace the ratchet pole to the meshing position, and it is possible to facilitate the inspection work of the operation of the passenger conveyor safety device.

It is a side view which shows the escalator according to Embodiment 1 of this invention. It is a perspective view which shows the inside of the upper end part in the longitudinal direction of the truss of FIG. It is a side view which shows the inside of the upper end part of the truss of FIG. 1 in the longitudinal direction. It is a side view which shows the state when the drive chain of FIG. 3 is broken. It is a side view which shows the state which the 2nd surface of the shoe of FIG. 3 faces a drive chain.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Embodiment 1.
FIG. 1 is a side view showing an escalator according to the first embodiment of the present invention. In the figure, the truss 1 is supported by a plurality of steps 3 connected endlessly by a step chain 2. A pair of balustrades 4 facing each other in the width direction of the truss 1 are provided on the truss 1. An endless moving handrail 5 is provided on the peripheral edge of each balustrade 4. The step 3 and the moving handrail 5 move in synchronization with each other.

Inside the upper end of the truss 1 in the longitudinal direction, there are a drive device 6, a sprocket device 7 that rotates by receiving the driving force of the drive device 6, a safety device 8 that stops the rotation of the sprocket device 7 when the escalator is abnormal, and an escalator. A control device (not shown) for controlling the operation is provided.

The drive machine 6 has a drive machine main body 9 including a motor and a brake device, and a drive machine sprocket 10 provided on the drive machine main body 9 and rotated by the driving force of the drive machine main body 9. The driving force is applied to the driving machine sprocket 10 by the motor of the driving machine main body 9, and the braking force is given by the operation of the braking device of the driving machine main body 9.

The sprocket device 7 has a spindle 11 arranged along the width direction of the truss 1, a drive sprocket 12 fixed to the spindle 11, and an upper step sprocket 13. The spindle 11, the drive sprocket 12, and the upper step sprocket 13 rotate integrally around the axis of the spindle 11.

An endless drive chain 14 is wound between the drive sprocket 10 and the drive sprocket 12. Tension is applied to the drive chain 14 so that the drive chain 14 does not loosen. The drive chain 14 is rotated by the rotation of the drive sprocket 10. The drive sprocket 12 rotates due to the orbital movement of the drive chain 14. As a result, the driving force of the driving machine 6 is transmitted to the driving sprocket 12 via the driving chain 14. The spindle 11, the drive sprocket 12, and the upper step sprocket 13 rotate integrally by transmitting the driving force of the drive 6 to the drive sprocket 12.

In the lower end portion of the truss 1 in the longitudinal direction, a lower step sprocket 15 that can rotate about the axis of the lower sprocket shaft arranged along the width direction of the truss 1 is provided. The step chain 2 is wound between the upper step sprocket 13 and the lower step sprocket 15. The step chain 2 is moved by the rotation of the upper step sprocket 13. Each step 3 circulates due to the movement of the step chain 2.

FIG. 2 is a perspective view showing the inside of the upper end portion of the truss 1 in the longitudinal direction of FIG. Further, FIG. 3 is a side view showing the inside of the upper end portion of the truss 1 of FIG. 1 in the longitudinal direction. Further, FIG. 4 is a side view showing a state when the drive chain 14 of FIG. 3 is broken. The safety device 8 includes a rotatable connecting shaft 21 arranged parallel to the common axis of the spindle 11, the drive sprocket 12, and the upper step sprocket 13, and a shoe 22 slidably mounted on the drive chain 14. The arm 23 fixed to the connecting shaft 21 and connected to the shoe 22, the ratchet wheel 24 fixed to the main shaft 11 and rotating integrally with the drive sprocket 12 and the upper step sprocket 13, and fixed to the connecting shaft 21. It has a ratchet pole 25 which is a stopper arranged on the radial outer side of the ratchet wheel 24, and a switch 26 which detects the rotation of the connecting shaft 21.

The connecting shaft 21 is rotatably supported by the support bracket 16 of the truss 1. Further, the connecting shaft 21 is arranged at a position higher than that of the main shaft 11. The arm 23 and the ratchet pole 25 rotate integrally with the connecting shaft 21 about the axis of the connecting shaft 21.

The arm 23 projects from the connecting shaft 21 in the radial direction of the connecting shaft 21. The shoe 22 is rotatably attached to the end of the arm 23. When the drive chain 14 is stretched between the drive sprocket 10 and the drive sprocket 12, the shoe 22 is supported by the drive chain 14, as shown in FIGS. 2 and 3. When the drive chain 14 breaks, as shown in FIG. 4, the arm 23 rotates integrally with the connecting shaft 21 in the direction in which the position of the shoe 22 becomes lower due to the weight of the shoe 22.

A plurality of teeth 24a are formed on the outer peripheral portion of the ratchet wheel 24. The ratchet wheel 24 rotates integrally with the spindle 11, the drive sprocket 12, and the upper step sprocket 13 around the axis of the spindle 11. As a result, the ratchet wheel 24 rotates according to the movement of the step 3.

The ratchet pole 25 projects from the connecting shaft 21 in a direction different from that of the arm 23 when viewed along the axial direction of the connecting shaft 21. Further, the ratchet pole 25 is displaced by the rotation of the connecting shaft 21 between the release position that is detached from the ratchet wheel 24 and the meshing position that is located below the release position and meshes with the teeth 24a of the ratchet wheel 24.

When the shoe 22 is mounted on the drive chain 14, the position of the ratchet pole 25 is maintained at the release position and the ratchet pole 25 is separated from the ratchet wheel 24 as shown in FIG. When the ratchet pole 25 is separated from the ratchet wheel 24, the ratchet wheel 24 is allowed to rotate, and the step 3 can be moved.

When the drive chain 14 breaks, as shown in FIG. 4, the shoe 22 is displaced downward by its own weight, and the connecting shaft 21 rotates integrally with the arm 23 and the ratchet pole 25. As a result, the ratchet pole 25 reaches the meshing position, and the ratchet pole 25 meshes with the teeth 24a of the ratchet wheel 24. As a result, the rotation of the ratchet wheel 24 is stopped, and the movement of the step 3 is stopped.

The switch 26 detects that the ratchet pole 25 has reached the detection position located between the release position and the meshing position by detecting the rotation of the connecting shaft 21. The ratchet pole 25 at the detection position is located closer to the ratchet wheel 24 than the release position, but is disengaged from the ratchet wheel 24 without engaging with the teeth 24a of the ratchet wheel 24. Further, the switch 26 is a contact type switch having a switch main body 26a fixed to the truss 1 and an operation unit 26b displaceable on the switch main body 26a.

As shown in FIG. 2, a cam 27 is fixed to the connecting shaft 21. As a result, the cam 27 rotates integrally with the connecting shaft 21. The cam 27 operates the operation unit 26b of the switch 26 when the ratchet pole 25 reaches the detection position. When the operation unit 26b is operated by the cam 27, a detection signal is sent from the switch 26 to the control device. When the control device receives the detection signal from the switch 26, the control device stops the operation of the escalator.

The shoe 22 is rotatable with respect to the arm 23 about a shoe shaft 31 provided at the end of the arm 23. The axis of the shoe shaft 31 is parallel to the axis of the connecting shaft 21. The shoe 22 is provided with a first surface 32, a second surface 33, and a third surface 34, which are different from each other. Each of the first surface 32, the second surface 33, and the third surface 34 is a plane orthogonal to a plane orthogonal to the axis of the shoe shaft 31. Therefore, the first surface 32, the second surface 33, and the third surface 34 selectively face the drive chain 14 by rotating the shoe 22 with respect to the arm 23 about the shoe shaft 31. It has become. In this example, the second surface 33 is parallel to the first surface 32.

The first distance a from the axis of the shoe shaft 31 to the first surface 32 is larger than the second distance b from the axis of the shoe shaft 31 to the second surface 33. Further, the third distance c from the axis of the shoe shaft 31 to the third surface 34 is smaller than the first distance a and larger than the second distance b. Further, the distance x from the release position of the ratchet pole 25 to the meshing position is a distance equal to or less than the difference between the first distance a and the second distance b, and the first distance a and the third distance a. It is larger than the difference with c. That is, the relationship of b <c <a and a−c <x ≦ a−b is satisfied.

As a result, in a state where the drive chain 14 is stretched between the drive sprocket 10 and the drive sprocket 12, the shoe 22 is placed on the drive chain 14 by bringing the first surface 32 into contact with the drive chain 14. As shown in 3, the ratchet pole 25 is held in the release position. Further, in a state where the drive chain 14 is stretched between the drive sprocket 10 and the drive sprocket 12, when the third surface 34 faces the drive chain 14, the first surface 32 faces the drive chain 14. Since the arm 23 is closer to the drive chain 14 than in the state, the ratchet pole 25 can reach the detection position.

FIG. 5 is a side view showing a state in which the second surface 33 of the shoe 22 of FIG. 3 faces the drive chain 14. In a state where the drive chain 14 is stretched between the drive sprocket 10 and the drive sprocket 12, when the second surface 33 faces the drive chain 14, the third surface 34 faces the drive chain 14. Since the arm 23 approaches the drive chain 14, the ratchet pole 25 can reach the meshing position.

Next, the operation will be described. During normal operation of the escalator, the shoe 22 is mounted on the drive chain 14 with the first surface 32 in contact with the drive chain 14. At this time, as shown in FIG. 3, the position of the ratchet pole 25 is maintained at the release position deviating from the ratchet wheel 24, and the ratchet wheel 24 is allowed to rotate.

Further, during normal operation of the escalator, when the drive sprocket 10 of the drive 6 is rotated under the control of the control device, the drive chain 14 orbits while the shoe 22 is mounted on the drive chain 14. As a result, the spindle 11, the drive sprocket 12, the upper step sprocket 13 and the ratchet wheel 24 rotate integrally, and the step 3 and the moving handrail 5 move in synchronization with each other.

When the drive chain 14 breaks abnormally, the shoe 22 is displaced downward by its own weight, and the arm 23, the connecting shaft 21, and the ratchet pole 25 rotate integrally. As a result, the ratchet pole 25 is displaced from the release position to the detection position, and the operation unit 26b of the switch 26 is operated by the cam 27. As a result, the detection signal is sent from the switch 26 to the control device, and the operation of the escalator is stopped.

After that, the ratchet pole 25 is further displaced from the detection position to reach the meshing position, and as shown in FIG. 4, the tip portion of the ratchet pole 25 meshes with the teeth 24a of the ratchet wheel 24. As a result, the rotation of the drive sprocket 12 and the upper step sprocket 13 is stopped, and the movement of the step is stopped.

Next, a procedure for checking the operation of the safety device 8 will be described. When checking whether the ratchet pole 25 is displaced to the meshing position when the drive chain 14 is broken, first, the first surface 32 comes into contact with the drive chain 14 and the position of the ratchet pole 25 is kept in the release position. From this state, the shoe 22 is rotated with respect to the arm 23 about the shoe shaft 31 so that the second surface 33 of the shoe 22 faces the drive chain 14.

After that, by turning the connecting shaft 21 in the direction in which the ratchet pole 25 approaches the ratchet wheel 24, it is checked whether or not the ratchet pole 25 reaches the meshing position. If the safety device 8 is normal, the ratchet pole 25 reaches the meshing position, and the ratchet pole 25 meshes with the teeth 24a of the ratchet wheel 24.

Further, when checking whether the ratchet pole 25 is displaced to the detection position when the drive chain 14 is broken, first, the first surface 32 comes into contact with the drive chain 14 and the position of the ratchet pole 25 is kept in the release position. From the leaning state, the shoe 22 is rotated with respect to the arm 23 about the shoe shaft 31 so that the third surface 34 of the shoe 22 faces the drive chain 14.

After that, by turning the connecting shaft 21 in the direction in which the ratchet pole 25 approaches the ratchet wheel 24, it is checked whether or not the ratchet pole 25 reaches the detection position. If the safety device 8 is normal, the ratchet pole 25 reaches the detection position, and the operation unit 26b of the switch 26 is operated by the cam 27.

After checking the operation of the safety device 8, the shoe 22 is turned with respect to the arm 23 so that the first surface 32 faces the drive chain 14. After that, the shoe 22 is placed on the drive chain 14 by bringing the first surface 32 into contact with the drive chain 14. In this way, the inspection work of the safety device 8 is completed.

In such an escalator safety device 8, the first distance a from the axis of the shoe shaft 31 to the first surface 32 is larger than the second distance b from the axis of the shoe shaft 31 to the second surface 33. Since it is large, even when the drive chain 14 is not broken, the ratchet pole 25 can reach the meshing position simply by turning the shoe 22 so that the second surface 33 faces the drive chain 14. .. As a result, it is not necessary to remove the shoe 22 from the arm 23 in order to displace the ratchet pole 25 to the meshing position, and it is possible to facilitate the inspection work of the operation of the safety device 8.

Further, since the third distance c from the axis of the shoe shaft 31 to the third surface 34 is smaller than the first distance a and larger than the second distance b, the drive chain 14 is broken. Even in the non-existing state, the ratchet pole 25 can reach the detection position simply by turning the shoe 22 so that the third surface 34 faces the drive chain 14. As a result, it is not necessary to remove the shoe 22 from the arm 23 in order to displace the ratchet pole 25 to the detection position, and the operation inspection work of the safety device 8 can be facilitated.

Further, in such an inspection method of the safety device 8, the shoe 22 is rotated with respect to the arm 23 so that the second surface 33 faces the drive chain 14, and then the ratchet pole 25 approaches the ratchet wheel 24. Since the connecting shaft 21 is rotated, the ratchet pole 25 can be displaced to the meshing position simply by rotating the shoe 22 even when the drive chain 14 is not broken. As a result, it is not necessary to remove the shoe 22 from the arm 23, and the operation inspection work of the safety device 8 can be facilitated.

In the above example, the color of the first surface 32 may be different from the color of the surface other than the first surface 32 of the shoe 22. For example, the color of the first surface 32 may be yellow and the color of the other surface of the shoe 22 may be white. In this way, the first surface 32 and the other surface of the shoe 22 can be easily and more reliably distinguished. As a result, when the inspection work of the safety device 8 is completed, it is confirmed whether or not the color of the first surface 32 can be seen, and whether or not the first surface 32 faces the drive chain 14. It can be easily confirmed, and the state of the safety device 8 can be restored more reliably.

Further, in the above example, the shoe shaft 31 may be provided with a twist spring which is an elastic body that urges the shoe 22 so that the first surface 32 faces the drive chain 14. In this case, one end of the twist spring is attached to the shoe shaft 31, and the other end of the twist spring is attached to the shoe 22. In this case, the shoe 22 rotates with respect to the arm 23 against the elastic restoring force of the twist spring, so that the second surface 33 and the third surface 34 of the shoe 22 face the drive chain 14. In this way, even if the first surface 32 is not opposed to the drive chain 14, the first surface 32 is generated by the elastic restoring force of the twist spring simply by eliminating the force applied to the shoe 22. Can return the shoe 22 to a state facing the drive chain 14.

Further, in the above example, the first surface 32, the second surface 33, and the third surface 34 are provided on the shoe 22, but the third surface 34 may not be provided. Even if the third surface 34 is not provided, the ratchet pole 25 can be displaced to the meshing position by making the second surface 33 face the drive chain 14, facilitating the operation inspection work of the safety device 8. be able to.

Further, in the above example, the present invention is applied to an escalator, but the present invention may be applied to a moving walkway which is a passenger conveyor.

12 drive sprocket, 14 drive chain, 21 connecting shaft, 22 shoe, 23 arm, 24 ratchet wheel, 25 ratchet pole, 31 shoe shaft, 32 first surface, 33 second surface, 34 third surface.

Claims (5)

A rotatable connecting shaft, which is located parallel to the axis of the drive sprocket,
A shoe mounted on a drive chain wound around the drive sprocket,
An arm fixed to the connecting shaft and connected to the shoe,
A ratchet wheel that rotates integrally with the drive sprocket, and a ratchet that is fixed to the connecting shaft and is displaced between a release position that is fixed to the connecting shaft and detached from the ratchet wheel and a meshing position that meshes with the ratchet wheel. Equipped with a pole
The shoe is rotatable about a shoe shaft provided on the arm.
The shoe is provided with a first surface and a second surface that are different from each other.
The first distance from the axis of the shoe shaft to the first surface is larger than the second distance from the axis of the shoe shaft to the second surface.
The ratchet pole is kept in the released position by bringing the first surface into contact with the drive chain and the shoe is placed on the drive chain, and the second surface faces the drive chain. A safety device for a passenger conveyor that makes it possible to reach the meshing position. A switch for detecting that the ratchet pole has reached a detection position located between the release position and the meshing position is provided.
The shoe is provided with a first surface and a third surface different from the second surface.
The third distance from the axis of the shoe shaft to the third surface is smaller than the first distance and larger than the second distance.
The safety device for a passenger conveyor according to claim 1, wherein the ratchet pole can reach the detection position by having the third surface face the drive chain. The passenger conveyor safety device according to claim 1 or 2, wherein the shoe is provided with an elastic body that urges the shoe so that the first surface faces the drive chain. The passenger conveyor safety device according to any one of claims 1 to 3, wherein the color of the first surface is different from the color of the other surfaces of the shoe other than the first surface. .. A method for inspecting a passenger conveyor safety device for checking the operation of the passenger conveyor safety device according to any one of claims 1 to 4.
From the state where the first surface is in contact with the drive chain and the ratchet pole is present at the release position, the shoe is rotated about the shoe shaft with respect to the arm to cause the second. A method for inspecting a safety device for a passenger conveyor that rotates the connecting shaft in a direction in which the ratchet pole approaches the ratchet wheel after the surface is made to face the drive chain.

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