JP4267643B2 - Passenger conveyor - Google Patents

Description

  The present invention relates to passenger conveyors such as escalators and electric roads, and more particularly to passenger conveyors that perform emergency braking control when a safety device is operating.

Conventionally, when a safety device is operated, the passenger conveyor is braked, using an operating brake that is electrically actuated by a frequency converter (inverter device, etc.) to perform braking at a constant deceleration and speed. Has been proposed that activates an auxiliary brake that detects a decrease in the speed to 0 m / sec and maintains a stationary state (see, for example, Patent Document 1).
Japanese Patent No. 3629207

  In the conventional passenger conveyor described above, it is possible to brake at a constant deceleration by controlling the inverter device during the operation of the safety device. As the speed fluctuates, the power transmission mechanism slips, causing a problem that the passenger conveyor cannot be stopped at a predetermined braking distance.

  The present invention has been made from the above-described prior art, and an object of the present invention is to provide a passenger conveyor that can stop the passenger conveyor at a predetermined braking distance when necessary regardless of the magnitude of the load. .

  In order to achieve the above-mentioned object, the invention according to claim 1 of the present invention includes a plurality of steps connected in an endless manner and circulated and a handrail that moves in synchronization with the steps and is guided by a balustrade component. A driving device including a motor for driving the steps and the moving handrail, an inverter device and a control device for changing the moving speed of the steps and the moving handrail via the driving device, and predetermined predetermined conditions Operation of the safety device in a passenger conveyor comprising a safety device that operates in accordance with the speed, a speed detector that detects the operating speed of the passenger conveyor, and a mechanical brake device that can apply a braking force by mechanical action Or, in response to at least one of the detection of equipment abnormality by the control device, the control device controls the output frequency and voltage of the inverter device to constant deceleration During the braking operation, the operation speed of the passenger conveyor is compared with a predetermined deceleration curve, and the operation speed of the passenger conveyor is equal to or more than a certain amount with respect to the predetermined deceleration curve. In this case, the mechanical braking device is switched to perform a braking operation.

  In the invention according to claim 1 of the present invention configured as described above, when the safety device operates or the control device detects a device abnormality, the control device controls the output frequency / voltage of the inverter device to be constant. While braking by deceleration, during this braking operation, the operation speed of the passenger conveyor is compared with a predetermined deceleration curve. And if it judges that the operating speed of a passenger conveyor became a speed difference more than fixed amount with respect to a predetermined deceleration curve, it will change from braking operation by an inverter device to braking operation by a mechanical brake device, and a passenger conveyor will be changed. Stop. Thus, by using braking by the inverter device together with braking by the mechanical brake device, the passenger conveyor can be stopped at a predetermined braking distance when necessary regardless of the magnitude of the load.

  In the invention according to claim 2 of the present invention, the control device integrates the signals output from the speed detector from the start of the braking operation at the time of braking operation by the inverter device, and the travel distance of the passenger conveyor Is calculated, and when it is detected that the travel distance exceeds a certain value, the mechanical brake device is switched to perform a braking operation.

  In the invention according to claim 2 of the present invention configured as described above, the control device integrates the signals output from the speed detector from the start of the braking operation at the time of the braking operation by the inverter device, and the travel distance of the passenger conveyor Is calculated, and when it is detected that the travel distance exceeds a certain value, the braking operation is performed by switching to the mechanical brake device. As a result, even if the braking by the inverter device is insufficient for some reason, the passenger conveyor can be stopped at a predetermined braking distance because it is supplemented by the mechanical brake device.

  Furthermore, the invention according to claim 3 of the present invention is such that when the operation speed of the passenger conveyor reaches 1.0 to 4.0 m / min by the braking operation by the inverter device, the control device It is characterized by switching to.

  In the invention according to claim 3 of the present invention configured as described above, the operation speed of the passenger conveyor is 1.0 to 4.0 m / min when switching the braking operation by the inverter device to the braking operation by the mechanical brake device. By setting when the value reaches the value, the passenger conveyor can be braked efficiently by the inverter device, while the passenger conveyor can be reliably stopped at a predetermined braking distance.

Further, the invention according to claim 4 of the present invention is characterized in that the speed curve is changed into a quadratic curve when switching from the normal operation state to the braking operation by the inverter device.

The invention according to claim 4 of the present invention configured as described above makes smooth the braking operation by setting the speed curve to be a quadratic curve at the time of transition from the normal operation state to the braking operation by the inverter device. As a result, it is possible to reduce the passenger's discomfort and anxiety associated with the braking operation and to minimize the passenger's posture displacement.

  As described above, according to the present invention, the passenger conveyor can be stopped at a predetermined braking distance when necessary regardless of the magnitude of the load. Satisfies and can improve safety.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of a passenger conveyor according to the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic configuration diagram showing an embodiment of a passenger conveyor of the present invention, FIG. 2 is an explanatory diagram showing a speed curve when the passenger conveyor is decelerated, and FIG. 3 is an enlarged view of a portion A shown in FIG.

  As shown in FIG. 1, the passenger conveyor of this embodiment is supplied with electric power from a three-phase AC power source 10 via a protective circuit breaker 11, a contactor contact 12, and an inverter device 13 to an AC induction motor 14. As the induction motor 14 rotates, the passenger conveyor is operated. A travel command 16 and a deceleration command 17 are output from the passenger conveyor control device 15 to the inverter device 13, and a failure signal 18 is output from the inverter device 13 to the control device 15. The safety devices 19a, 19b, 19c, 19d and the safety circuit general relay 20 are connected in series, and the safety device operation signal 21 output from the safety devices 19a to 19d is taken into the control device 15. Further, a mechanical brake (not shown) for mechanically braking the passenger conveyor is provided, and contactor contacts 23a and 23b for controlling the supply of electric power to the electromagnetic coil 22 for releasing the mechanical brake are provided. . Furthermore, a speed detector 14a for detecting the operation speed of the passenger conveyor is provided. Further, the contact 20 a of the safety circuit general relay 20 described above is interposed between the control device 15 and the inverter device 13.

  Here, the processing procedure of the passenger conveyor of the present embodiment will be described with reference to FIGS. 1 to 3 by taking as an example the case where any one of the safety devices 19a to 19d operates during the passenger conveyor operation. For example, when the safety device 19a operates, a safety device operation signal 21 is output to the control device 15 and the safety circuit general relay 20 is cut off. The control device 15 blocks the travel command 16 for the inverter device 13. Further, when the contact 20a of the safety general relay 20 is opened, the travel command 16 is prevented from being output to the inverter device 13. Accordingly, as shown in FIG. 2, the passenger conveyor that has been in the normal operation state 1 shifts to a braking operation by the inverter device 13 along a predetermined deceleration curve 3 that is determined in advance when the emergency stop condition is satisfied. In this state transition, as shown in FIG. 3, while a transition from the normal operation state 1 to the braking operation by the inverter device 13 is performed, a speed change 8 having a quadratic curve is applied, thereby suppressing a rapid speed change and Reduce discomfort, anxiety, and changes in posture. That is, when the deceleration command 17 is given from the control device 15 to the inverter device 13, the output frequency / voltage of the inverter device 13 is controlled so that the rotation speed of the induction motor 14 becomes the deceleration curve 3. Thereafter, when the speed detector 14a detects that the operating speed of the passenger conveyor has decreased to, for example, 3.0 m / min, the control device 15 opens the contactor contacts 23a and 23b and opens the mechanical brake device electromagnetic. While energizing the coil 22 is cut off to activate a mechanical brake (not shown), the contactor contact 12 is opened to cut off the power supply to the inverter device 13 and the power supply to the induction motor 14. Thus, a braking operation by mechanical braking is performed along the deceleration curve 3 shown in FIG. 2, the passenger conveyor is stopped, and the passenger conveyor is held stationary.

  Next, the abnormal state monitoring of passenger conveyor braking will be described. The deceleration curve 3 and the monitoring condition speed curve 5 described above are set in advance on the passenger conveyor of the present embodiment. It is assumed that an allowable fluctuation speed difference 4 is added to the operation speed curve in the deceleration curve 3. If the deceleration command 17 is not normally transmitted due to an abnormality in the inverter device 13 or the control device 15, the deceleration command 3 is not the deceleration on the deceleration curve 3, but other decelerations such as the deceleration at the time of speed switching. It can be considered that deceleration is performed. If deceleration is continued with this deceleration, the deceleration curve 7 of the passenger conveyor crosses the monitoring condition speed curve 5 as shown by the dotted line in FIG. 2, and at this time, the control device 15 recognizes that the speed is abnormal. This time is defined as speed abnormality detection time 6. In response to this, the control device 15 opens the contactor contacts 23a and 23b, cuts off the energization to the electromagnetic coil 22 for opening the mechanical brake device to operate the mechanical brake, and opens the contactor contact 12. The power supply to the inverter device 13 and the power supply to the induction motor 14 are cut off. Thus, a braking operation by mechanical braking along the deceleration curve 7 shown in FIG. 2 is performed, the passenger conveyor is stopped within a predetermined moving distance, and the passenger conveyor is held stationary. The monitoring condition speed curve 5 is set in a range that does not exceed the emergency braking distance at the time of occurrence of an abnormality defined by related laws and regulations.

  In addition, when the deceleration operation is performed at a speed close to the monitoring condition speed curve 5, it may be possible to reach a distance close to the upper limit value of the emergency braking distance. Therefore, the emergency stop of the passenger conveyor such as the operation of the safety devices 19a to 19d is possible. The elapsed travel distance from the time point 2 at which the condition is satisfied is calculated by the control device 15 based on a signal output from the speed detector 14a. If the calculated elapsed travel distance exceeds a certain value, an emergency braking distance abnormality is Recognizing, the contactor contacts 23a and 23b are opened, the energization to the mechanical brake device opening electromagnetic coil 22 is interrupted to activate the mechanical brake, and the contactor contact 12 is opened to the inverter device 13. And the power supply to the induction motor 14 are cut off. Thereby, the braking operation by the mechanical brake is performed, and the passenger conveyor is stopped within a predetermined moving distance.

  Further, for example, when an emergency stop condition of the passenger conveyor such as the operation of the safety devices 19a to 19d is established in a state where the speed detector 14a is abnormal and the speed information is not normally recognized by the control device 15, the inverter Without the braking operation by the device 13, the control device 15 opens the contactor contacts 23a, 23b at the time point 2 at which the emergency stop condition is satisfied, cuts off the energization to the electromagnetic coil 22 for opening the mechanical brake device, and performs the mechanical brake. At the same time, the contactor contact 12 is opened to cut off the power supply to the inverter device 13 and the power supply to the induction motor 14. Thereby, the braking operation by the mechanical brake is performed along the deceleration curve 3 shown in FIG. 2, and the passenger conveyor is stopped. Similarly, when an abnormality occurs in the inverter device 13 and the failure signal 18 is output to the control device 15, similarly, the braking operation by the inverter device 13 is not performed, and the control device 15 does not contact the contactor contact point when the emergency stop condition is satisfied 2. 23a and 23b are opened, the mechanical brake device opening electromagnetic coil 22 is cut off to activate the mechanical brake, the contactor contact 12 is opened to supply power to the inverter device 13, and the induction motor. The power supply to 14 is cut off. Thereby, the braking operation by the mechanical brake is performed along the deceleration curve 3 shown in FIG. 2, and the passenger conveyor is stopped.

  According to the present embodiment, the passenger conveyor can be stopped at a predetermined braking distance when necessary regardless of the magnitude of the load, so that the performance of the passenger conveyor surely satisfies the standards defined by the related laws and regulations, Safety can be improved. Further, even if the braking by the inverter device is insufficient for some reason, the passenger conveyor can be stopped at a predetermined braking distance because the mechanical braking device supplements the braking. Furthermore, the inverter device is more efficient by setting the timing of switching from the braking operation by the inverter device to the braking operation by the mechanical brake device when the operation speed of the passenger conveyor reaches 1.0 to 4.0 m / min. Thus, the passenger conveyor can be braked, and the passenger conveyor can be reliably stopped at a predetermined braking distance.

  Furthermore, the contact 20a of the safety circuit general relay 20 that generalizes the operation of the safety devices 19a to 19d is provided in the travel command section of the inverter device, and the travel command is cut off according to the operation of the safety device, so that the safety device is reliably operated. The passenger conveyor can be switched to the braking state. In addition, by setting the speed curve to be a quadratic curve at the time of transition from the normal operation state to the braking operation by the inverter device 13, the braking operation is made smooth, thereby making the passenger feel uncomfortable with the braking operation, Anxiety can be alleviated and the passenger's posture displacement can be minimized. Furthermore, when the speed information of the passenger conveyor cannot be acquired due to the abnormality of the speed detector 14a, the control device 15 invalidates the braking operation by the inverter device 13 and reliably performs the braking operation by the mechanical brake device. The passenger conveyor can be stopped at a predetermined braking distance.

It is a schematic block diagram which shows one Embodiment of the passenger conveyor of this invention. It is explanatory drawing showing the speed curve at the time of deceleration of a passenger conveyor. It is an enlarged view of the A section shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 3 Predetermined deceleration curve 5 Monitoring condition speed curve 10 Three-phase alternating current power supply 11 Protection circuit breaker 12 Contactor contact 13 Inverter device 14 AC induction motor 14a Speed detector 15 Control device 19a-19d Safety device 20 Safety circuit general relay 20a Contact of safety circuit general relay 22 Electromagnetic coil for mechanical brake 23a, 23b Contact of electromagnetic coil control contactor

Claims (4)

A plurality of steps that are connected endlessly and circulate and move, a moving handrail that moves in synchronization with the step and is guided by the balustrade component, and a drive device that includes a motor that drives the steps and the moving handrail; An inverter device and a control device that change the moving speed of the steps and the moving handrail via the driving device, a safety device that operates in accordance with predetermined conditions, and a speed detection that detects the operating speed of the passenger conveyor And a passenger conveyor provided with a mechanical brake device capable of applying a braking force by mechanical action,
In response to at least one of the operation of the safety device or the detection of equipment abnormality by the control device, the control device controls the output frequency and voltage of the inverter device to perform braking at a constant deceleration, and this braking operation When the operation speed of the passenger conveyor is compared with a predetermined deceleration curve determined in advance, and the operation speed of the passenger conveyor becomes a speed difference of a certain amount or more with respect to the predetermined deceleration curve, the mechanical brake Passenger conveyor characterized by switching to a device to perform a braking operation.   The control device calculates the travel distance of the passenger conveyor by integrating the signals output from the speed detector from the start of the braking operation during the braking operation by the inverter device, and the traveling distance exceeds a certain value. The passenger conveyor according to claim 1, wherein when it is detected that the brake is operated, the mechanical brake device is switched to perform a braking operation.   2. The passenger according to claim 1, wherein the control device switches to the mechanical brake device when a driving speed of a passenger conveyor reaches 1.0 to 4.0 m / min by a braking operation by the inverter device. Conveyor. The passenger conveyor according to claim 1, wherein when switching from a normal operation state to a braking operation by the inverter device, the speed curve is changed into a quadratic curve .

Images