Self-adaptive braking system and method for escalator

Abstract

The invention discloses a self-adaptive braking system and method for an escalator. The system comprises a controller, a frequency converter and an escalator motor, the controller is provided with a detection calculation module and a deceleration preset module; the controller is electrically connected with the frequency converter and the escalator motor. The escalator motor is electrically connected with the frequency converter; the detection calculation module is connected with the deceleration preset module; the frequency converter is used for adjusting the speed of the escalator motor; the deceleration presetting module is used for setting an instantaneous deceleration expected curve of the escalator in the deceleration process and an expected braking torque of an escalator motor; the detection calculation module is used for calculating the real-time load torque of the escalator motor and the instantaneous deceleration change condition of the escalator at the corresponding moment under the working condition of deceleration and escalator stopping, and then the controller controls the frequency converter to adjust the output torque of the escalator motor according to the real-time change condition, so that the subsequent instantaneous deceleration of the escalator is matched with an instantaneous deceleration expected curve. The instantaneous deceleration of the escalator can be adjusted under the full-load condition and the no-load condition.

Description

Technical Field

[0001] The invention belongs to the technical field of escalator equipment, and in particular relates to an escalator adaptive braking system and method. Background Art

[0002] Escalators are typical equipment for transporting passengers in public places. Since escalators are much more efficient than vertical elevators in transporting passengers per unit time, they are widely used in shopping malls, airports, high-speed rail stations, subways, hotels and other places.

[0003] When an escalator encounters a malfunction, in order to prevent passengers on the escalator from losing balance and falling due to the escalator decelerating too quickly, the national standard stipulates that when the escalator is running downward, the deceleration of the working brake in the running direction should not be greater than 1m / s 2 When inspecting escalators, it is generally considered that the average deceleration during braking meets the standard, that is, the average deceleration during the process of decelerating from the rated speed to 0 is not greater than 1m / s 2 .

[0004] In the prior art, the working brakes on escalators are mostly electromechanical brakes. The braking force of the electromechanical brake is generally generated by one or more guided compression springs. A braking force balance point is taken between the full load and the empty load of the escalator to adjust the spring compression amount, so that the escalator can meet the braking distance requirements under different load conditions and the average deceleration is not greater than 1m / s. 2 The escalator controller measures whether the average deceleration is greater than 1m / s 2 To determine whether the working brake meets the national standard requirements.

[0005] However, even if the average deceleration required by the national standard is met, if there are children, elderly people or passengers who are not holding on to their hands, the instantaneous deceleration of the escalator exceeds 1m / s. 2 In this case, there is still the possibility that children, the elderly or passengers who are not holding on to the escalator may fall and get injured due to sudden braking.

[0006] For customers with strict deceleration requirements, such as subways, high-speed railways, and other crowded places, according to the traditional electromechanical working brake, if the escalator needs to brake, the instantaneous deceleration should not exceed 1m / s. 2 , then after the spring is adjusted, under the condition of fixed spring braking force, it is difficult to simultaneously meet the requirement that the instantaneous deceleration under no-load and full-load conditions is no more than 1m / s 2 If the spring compression is adjusted according to the full load condition, the full load instantaneous deceleration shall not exceed 1m / s 2 However, at this time, under the same spring compression, the instantaneous deceleration without load will be greater than 1m / s2 As a result, the parameter setting of the spring compression amount of the working brake cannot take into account both full load and no-load conditions at the same time. Summary of the invention

[0007] In order to overcome the defects and shortcomings of the prior art, the first purpose of the present invention is to provide an escalator adaptive braking system, and the second purpose is to provide an escalator adaptive braking method, which can timely adjust the instantaneous deceleration of the escalator in both full load and no-load conditions to meet expectations.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions: An escalator adaptive braking system comprises a controller, a frequency converter, and an escalator motor; The controller is equipped with a detection and calculation module and a deceleration preset module; The controller is electrically connected to the frequency converter and the escalator motor respectively; The escalator motor is electrically connected to the frequency converter; The detection and calculation module is connected with the deceleration preset module; The frequency converter is used to adjust the speed of the escalator motor; The deceleration preset module is used to set the expected instantaneous deceleration curve of the escalator during the deceleration process and the expected braking torque of the escalator motor; The detection and calculation module is used to calculate the real-time load torque of the escalator motor and the instantaneous deceleration change of the escalator at the corresponding moment under the condition of deceleration and stopping the escalator. Then the controller controls the inverter to adjust the output torque of the escalator motor according to the real-time changes, so that the subsequent instantaneous deceleration of the escalator matches the expected instantaneous deceleration curve.

[0009] Preferably, the controller is further provided with a frequency conversion control module; The frequency conversion control module is electrically connected to the frequency converter, and the frequency conversion control module is connected to the detection and calculation module; The frequency conversion control module is used to adjust the calculation result of the output torque of the escalator motor according to the detection calculation module, and output the corresponding speed control signal to the frequency converter.

[0010] Preferably, it also includes a working brake; The working brake is electrically connected to the controller, and the working brake is connected to the escalator motor; The detection and calculation module is used to control the working brake to mechanically stop the escalator motor when it is detected that the frequency converter fails to adjust the escalator motor.

[0011] Furthermore, the controller is also provided with a brake control module; The brake control module is electrically connected to the working brake, and the brake control module is connected to the detection and calculation module; The brake control module is used to output a corresponding stop control signal to the working brake when the detection calculation module detects that the frequency converter fails to adjust the escalator motor.

[0012] Preferably, it also includes a backup supercapacitor power supply; The backup supercapacitor power supply is electrically connected to the controller and the frequency converter respectively; The backup supercapacitor power supply is used to provide short-term power to the inverter and / or controller when the inverter and / or controller is powered off.

[0013] Furthermore, the controller is also provided with a power supply switching module; The power supply switching module is electrically connected to the backup supercapacitor power supply, and the power supply switching module is connected to the detection calculation module; The power supply switching module is used to switch the power supply line to provide short-term power to the frequency converter and / or controller from the backup super capacitor power supply when the detection calculation module detects that the frequency converter and / or controller is powered off.

[0014] The escalator adaptive braking method according to any of the above-mentioned escalator adaptive braking systems comprises the following steps: In the deceleration preset module of the controller, the expected instantaneous deceleration curve of the escalator during the deceleration process and the expected braking torque of the escalator motor are set; The detection and calculation module of the controller calculates the real-time load torque of the escalator motor and the instantaneous deceleration change of the escalator at the corresponding moment under the condition of deceleration and stopping the escalator; The detection and calculation module compares the real-time changes with the expected instantaneous deceleration curve of the escalator during the deceleration process and the expected braking torque of the escalator motor set in the deceleration preset module; When the detection calculation module detects that the real-time instantaneous deceleration of the escalator motor deviates from the set instantaneous deceleration expected curve, the controller controls the inverter to adjust the output torque of the escalator motor so that the subsequent instantaneous deceleration of the escalator matches the instantaneous deceleration expected curve.

[0015] Preferably, when the detection calculation module controls the frequency converter, the method further includes the following steps: The detection calculation module detects whether the frequency converter fails to adjust the escalator motor; When the inverter fails to adjust the escalator motor, the brake control module outputs a corresponding stop control signal to the working brake to control the working brake to mechanically stop the escalator motor.

[0016] Preferably, when the detection calculation module controls the frequency converter, the method further includes the following steps: The detection calculation module detects whether the inverter and / or the controller is powered off; When a power failure condition of the frequency converter and / or controller is detected, the power supply switching module switches the power supply line so that the backup super capacitor power supply provides short-term power to the frequency converter and / or controller.

[0017] Preferably, the frequency conversion control module in the controller outputs a corresponding speed control signal to control the frequency converter to adjust the output torque of the escalator motor; Before setting the deceleration preset module, set the forced release parameters of the spring closing force in the working brake according to the working conditions at full load.

[0018] Compared with the prior art, the present invention has the following advantages and beneficial effects: The present invention can ensure that the braking distance of the escalator meets the requirements of the national standard GB16899-2011 under different load conditions, and at the same time make the braking process more stable, and the instantaneous deceleration of the entire braking process also does not exceed 1m / s 2 , to avoid passengers falling and getting injured due to excessive braking, and to reduce the wear of brake shoes; when the inverter brake fails, the working brake can be activated in advance to ensure that the escalator's braking distance meets the standard and stops completely. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the framework structure of an escalator adaptive braking system of the present invention; Figure 2 The present invention is a schematic flow chart of an escalator adaptive braking method. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0021] It should be noted that the directions or positional relationships indicated by terms such as “center”, “up”, “down”, “left”, “right”, “vertical”, “horizontal”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present disclosure and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present disclosure.

[0022] In addition, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance. Similarly, words such as "one", "an", or "the" do not indicate a quantitative limitation, but rather indicate the presence of at least one. Words such as "include" or "comprise" and the like mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "electrically connected" or "connected" and the like are not limited to physical or mechanical electrical connections, but may include electrical connections, whether direct or indirect.

[0023] Example 1 like Figure 1 This embodiment provides an escalator adaptive braking system, including a controller, a frequency converter, an escalator motor, a working brake, and a backup super capacitor power supply.

[0024] The controller is electrically connected to the frequency converter, working brake, escalator motor, and backup supercapacitor power supply. The escalator motor is electrically connected to the frequency converter, and the working brake is connected to the escalator motor. The frequency converter is used to adjust the speed of the escalator motor. The frequency converter changes the output torque and speed of the escalator motor by adjusting the input voltage or input current of the escalator motor; the working brake achieves the deceleration and shutdown of the escalator motor by mechanically stopping the rotating shaft of the escalator motor. The backup supercapacitor power supply is electrically connected to the frequency converter.

[0025] The controller is provided with a detection and calculation module, a deceleration preset module, a frequency conversion control module, a braking control module and a power supply switching module.

[0026] The detection and calculation module is connected to the deceleration preset module. The deceleration preset module is used to set the expected instantaneous deceleration curve of the escalator during the deceleration process and the expected braking torque of the escalator motor. The detection and calculation module is used to calculate the real-time load torque of the escalator motor and the instantaneous deceleration change of the escalator at the corresponding moment under the working condition of deceleration and stopping the escalator. Then the controller controls the inverter to adjust the output torque of the escalator motor according to the real-time changes, so that the subsequent instantaneous deceleration of the escalator matches the expected instantaneous deceleration curve.

[0027] The frequency conversion control module is electrically connected to the frequency converter, and is connected to the detection and calculation module. The frequency conversion control module is used to adjust the calculation result of the output torque of the escalator motor according to the detection and calculation module, and output a corresponding speed control signal to the frequency converter.

[0028] The detection and calculation module is used to control the working brake to mechanically stop the escalator motor when it is detected that the frequency converter fails to adjust the escalator motor.

[0029] The brake control module is electrically connected to the working brake, and is connected to the detection and calculation module. The brake control module is used to output a corresponding stop control signal to the working brake when the detection and calculation module detects that the frequency converter fails to adjust the escalator motor.

[0030] The backup supercapacitor power supply is used to provide short-term power to the inverter and / or controller when the inverter and / or controller is powered off.

[0031] The power supply switching module is electrically connected to the backup supercapacitor power supply, and the power supply switching module is connected to the detection and calculation module. The power supply switching module is used to switch the power supply line to supply power to the inverter and / or controller from the backup supercapacitor power supply for a short time when the detection and calculation module detects that the inverter and / or controller is powered off.

[0032] Compared with the prior art, this embodiment has the following beneficial effects: This embodiment can ensure that the braking distance of the escalator meets the requirements of the national standard GB16899-2011 under different load conditions, and at the same time make the braking process smoother, and the instantaneous deceleration of the entire braking process also does not exceed 1m / s 2 , to avoid passengers falling and getting injured due to excessive braking, and to reduce the wear of brake shoes; when the inverter brake fails, the working brake can be activated in advance to ensure that the escalator's braking distance meets the standard and stops completely.

[0033] Example 2 like Figure 2 This embodiment provides an escalator adaptive braking method, comprising the following steps: S1. Set the forced release parameters of the spring closing force in the working brake according to the working conditions of the escalator when it is fully loaded; S2. In the deceleration preset module of the controller, set the expected instantaneous deceleration curve of the escalator during the deceleration process and the expected braking torque of the escalator motor, and then start the escalator operation; S3, the detection and calculation module of the controller calculates the real-time load torque of the escalator motor and the instantaneous deceleration change of the escalator at the corresponding moment under the working condition of deceleration and stopping the escalator, such as when the detection and calculation module detects that the escalator is stopped due to power failure, escalator failure deceleration, and manual deceleration; S4, the detection and calculation module compares the real-time change with the expected instantaneous deceleration curve of the escalator during the deceleration process and the expected braking torque of the escalator motor set in the deceleration preset module; S5. When the detection calculation module detects that the real-time instantaneous deceleration of the escalator motor deviates from the set instantaneous deceleration expected curve, the controller controls the frequency converter to adjust the output torque of the escalator motor so that the subsequent instantaneous deceleration of the escalator matches the instantaneous deceleration expected curve; specifically, the frequency conversion control module in the controller outputs a corresponding speed control signal to control the frequency converter to adjust the output torque of the escalator motor; S6. While executing any one of steps S3 to S5, the detection calculation module detects whether the frequency converter fails to adjust the escalator motor; When the inverter fails to adjust the escalator motor, the step S3, the step S4 or the step S5 is immediately interrupted and the execution of this step is jumped to the brake control module, and the brake control module outputs a corresponding stop control signal to the working brake, and controls the working brake to mechanically stop the escalator motor according to the set forced release parameters; Otherwise, execute steps S3 to S5; S7, while executing any one of steps S3 to S6, the detection calculation module detects whether the inverter and / or the controller is powered off; When the inverter and / or controller is detected to be powered off, step S3 or step S4 or step S5 or step S6 is immediately interrupted, and the execution of this step is jumped to the power supply switching module, which switches the power supply line to provide short-term power to the inverter and / or controller from the backup supercapacitor power supply, and then returns to step S6 and starts again.

[0034] Compared with the prior art, this embodiment has the following beneficial effects: This embodiment can ensure that the braking distance of the escalator meets the requirements of the national standard GB16899-2011 under different load conditions, and at the same time make the braking process smoother, and the instantaneous deceleration of the entire braking process also does not exceed 1m / s 2 , to avoid passengers falling and getting injured due to excessive braking, and to reduce the wear of brake shoes; when the inverter brake fails, the working brake can be activated in advance to ensure that the escalator's braking distance meets the standard and stops completely.

[0035] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. An escalator adaptive braking system, characterized in that: Including controller, inverter, escalator motor; The controller is provided with a detection and calculation module and a deceleration preset module; The controller is electrically connected to the frequency converter and the escalator motor respectively; The escalator motor is electrically connected to the frequency converter; The detection and calculation module is connected to the deceleration preset module; The frequency converter is used to adjust the speed of the escalator motor; The deceleration preset module is used to set the expected instantaneous deceleration curve of the escalator during the deceleration process and the expected braking torque of the escalator motor; The detection and calculation module is used to calculate the real-time load torque of the escalator motor and the instantaneous deceleration change of the escalator at the corresponding moment under the condition of deceleration and stopping the escalator. Then the controller controls the inverter to adjust the output torque of the escalator motor according to the real-time changes, so that the subsequent instantaneous deceleration of the escalator matches the expected instantaneous deceleration curve.

2. The escalator adaptive braking system according to claim 1, characterized in that: The controller is also provided with a frequency conversion control module; The frequency conversion control module is electrically connected to the frequency converter, and the frequency conversion control module is connected to the detection and calculation module; The frequency conversion control module is used to adjust the calculation result of the output torque of the escalator motor according to the detection calculation module, and output the corresponding speed control signal to the frequency converter.

3. The escalator adaptive braking system according to claim 1, characterized in that: Also includes working brakes; The working brake is electrically connected to the controller, and the working brake is connected to the escalator motor; The detection and calculation module is used to control the working brake to mechanically stop the escalator motor when it is detected that the frequency converter fails to adjust the escalator motor.

4. The escalator adaptive braking system according to claim 3, characterized in that: The controller is also provided with a brake control module; The brake control module is electrically connected to the working brake, and the brake control module is connected to the detection and calculation module; The brake control module is used to output a corresponding stop control signal to the working brake when the detection calculation module detects that the frequency converter fails to adjust the escalator motor.

5. The escalator adaptive braking system according to claim 1, characterized in that: Also included is a backup supercapacitor power supply; The backup supercapacitor power supply is electrically connected to the controller and the frequency converter respectively; The backup supercapacitor power supply is used to provide short-term power to the inverter and / or controller when the inverter and / or controller is powered off.

6. The escalator adaptive braking system according to claim 5, characterized in that: The controller is also provided with a power supply switching module; The power supply switching module is electrically connected to the backup supercapacitor power supply, and the power supply switching module is connected to the detection and calculation module; The power supply switching module is used to switch the power supply line to provide short-term power to the frequency converter and / or controller from the backup super capacitor power supply when the detection calculation module detects that the frequency converter and / or controller is powered off.

7. The escalator adaptive braking method according to any one of claims 1 to 6, characterized in that: The steps include: In the deceleration preset module of the controller, the expected instantaneous deceleration curve of the escalator during the deceleration process and the expected braking torque of the escalator motor are set; The detection and calculation module of the controller calculates the real-time load torque of the escalator motor and the instantaneous deceleration change of the escalator at the corresponding moment under the condition of deceleration and stopping the escalator; The detection and calculation module compares the real-time changes with the expected instantaneous deceleration curve of the escalator during the deceleration process and the expected braking torque of the escalator motor set in the deceleration preset module; When the detection calculation module detects that the real-time instantaneous deceleration of the escalator motor deviates from the set instantaneous deceleration expected curve, the controller controls the inverter to adjust the output torque of the escalator motor so that the subsequent instantaneous deceleration of the escalator matches the instantaneous deceleration expected curve.

8. The escalator adaptive braking method according to claim 7, characterized in that: When the detection calculation module controls the frequency converter, the steps are also included: The detection calculation module detects whether the frequency converter fails to adjust the escalator motor; When the inverter fails to adjust the escalator motor, the brake control module outputs a corresponding stop control signal to the working brake to control the working brake to mechanically stop the escalator motor.

9. The escalator adaptive braking method according to claim 7, characterized in that: When the detection calculation module controls the frequency converter, the steps are also included: The detection calculation module detects whether the inverter and / or the controller is powered off; When a power failure condition of the frequency converter and / or controller is detected, the power supply switching module switches the power supply line so that the backup super capacitor power supply provides short-term power to the frequency converter and / or controller.

10. The escalator adaptive braking method according to claim 7, characterized in that: The frequency conversion control module in the controller outputs the corresponding speed control signal to control the frequency converter to adjust the output torque of the escalator motor; Before setting the deceleration preset module, set the forced release parameters of the spring closing force in the working brake according to the working conditions at full load.

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