A power-off brake release speed display and protection device for elevators

Abstract

The present invention discloses a power-off brake speed display and protection device for an elevator, which relates to the technical field of elevators and includes an elevator mainboard, a speed monitoring board, a mainboard communication module, an electric brake and a signal verification module; the speed monitoring board is used to monitor the elevator running speed; when the elevator running speed exceeds 0.3m / s or the elevator slides to the leveling area, the elevator mainboard will automatically disconnect the electric brake output; the mainboard communication module is used to output a motor encoder pulse signal to the elevator mainboard through power supply feedback PG card signal, so as to realize speed and direction display; the elevator mainboard is used to judge the host pulse number according to the received motor encoder pulse signal, thereby judging the elevator running speed and running direction, limiting the elevator running speed to below 0.3m / s, and limiting the elevator sliding to the door area through the leveling switch signal; safer process operation can be achieved, and the risks of brake overspeed and brake over-leveling can be greatly reduced.

Description

Technical Field

[0001] The invention relates to the technical field of elevators, in particular to a power-off brake release speed display and protection device for an elevator. Background Art

[0002] With the continuous development of modern elevator technology, energy-saving, environmentally friendly and space-saving machine-room-less elevators have become increasingly popular among customers. However, due to their compact design and small space, machine-room-less elevators are not as convenient to operate as machine-room-based elevators. During the use of machine-room-less elevators, if the power supply system fails or other unexpected factors occur, passengers may be trapped in the elevator.

[0003] When an elevator is operating in an emergency, the emergency rescue mode mostly uses manual brake release. When the manual brake release mode is used, the operator can only judge the position and speed of the car by experience and visual observation of the wire rope markings. This disadvantage is more obvious in elevators without a machine room, which greatly increases the probability of accidents for rescuers. Based on the above shortcomings, the present invention proposes a power-off brake release speed display and protection device for elevators. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides an elevator power-off brake release speed display and protection device. By providing a leveling signal and a motor encoder pulse signal, the device determines the car's operating speed and car's sliding position. It automatically releases the brake when the car reaches the leveling area. This device can more effectively determine the elevator's sliding direction and speed, and more reliably guide the elevator to the leveling position.

[0005] To achieve the above-mentioned object, an embodiment of the first aspect of the present invention provides a power-off brake release speed display and protection device for an elevator, comprising an elevator mainboard, a speed monitoring board, a mainboard communication module, an electric brake release, and a signal verification module;

[0006] The speed monitoring board is used to monitor the elevator running speed; when the elevator running speed exceeds 0.3m / s or the elevator slides to the leveling area, the elevator main board will automatically disconnect the electric release output;

[0007] The mainboard communication module is used to feed back the PG card signal through power supply and output the motor encoder pulse signal to the elevator mainboard to realize the display of speed and direction;

[0008] The elevator mainboard is used to determine the host pulse number based on the received motor encoder pulse signal, thereby determining the elevator running speed and direction, limiting the elevator running speed to below 0.3m / s, and limiting the elevator slipping to the door area through the leveling switch signal;

[0009] The elevator mainboard is connected to a signal verification module; the signal verification module is used to verify the communication status of the elevator mainboard in real time and calculate the communication deviation coefficient Cs;

[0010] If Cs is greater than the preset deviation threshold, the communication status of the elevator mainboard is determined to be abnormal. At this time, the identified host pulse number is invalid, and the motor encoder pulse signal is re-read for identification.

[0011] Furthermore, the specific verification steps of the signal verification module are:

[0012] The signal verification module sends a verification configuration message to the FPGA master control of the elevator mainboard according to a preset verification period, wherein the verification configuration message includes a first signal quality threshold;

[0013] In response to receiving the verification configuration message sent by the signal verification module, the FPGA master control of the elevator mainboard sends a second synchronization signal to the signal verification module to calculate the signal loss index TX;

[0014] Create a curve graph showing the change of the signal loss index TX over time, and compare the signal loss index TX with a preset loss threshold; if TX is greater than the preset loss threshold, intercept the corresponding curve segment in the corresponding curve graph and mark it as a deviation curve segment;

[0015] Within a preset time period, the number of deviation curve segments is counted as P1; all deviation curve segments are integrated over time to obtain the deviation reference area M1; the communication deviation coefficient Cs is calculated using the formula Cs=C1×g1+M1×g2; where g1 and g2 are coefficient factors.

[0016] Furthermore, the signal verification module further includes:

[0017] In response to monitoring the second synchronization signal, the signal verification module determines the signal quality of the second synchronization signal and compares the signal quality of the second synchronization signal with the first signal quality threshold to obtain a corresponding quality difference ZC;

[0018] The time difference between the moment when the signal verification module sends the verification configuration message and the moment when the signal verification module listens to the second synchronization signal again is calculated to obtain the response time XT; the signal loss index TX is calculated using the formula SH=ZC×a1+XT×a2, where a1 and a2 are coefficient factors.

[0019] Furthermore, the speed monitoring board is connected to the electric release brake and is used to provide power to the electric release brake. Specifically, when the elevator is running normally, the speed monitoring board does not provide power;

[0020] When the electric brake is released, the speed monitoring board outputs ±12V for power supply;

[0021] When the elevator running speed exceeds the preset threshold, the speed monitoring board is disconnected from the electric release brake, and the electric release brake cannot output the release power.

[0022] Furthermore, when using the release function of the electric release, switch the release switch and press and hold the release button. At this time, the speed monitoring board outputs ±12V for power supply, the electric release outputs the release power supply, and the brake is released; when the elevator running speed exceeds 0.3m / s or the elevator slides to the leveling area, the electric release output will be automatically disconnected to realize the stop function at the station.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The present invention provides a leveling signal and a motor encoder pulse signal to determine the car's operating speed and car's sliding position, and automatically disconnects the brake when the car reaches the leveling area. By combining the electric brake power supply with the existing button, adding a speed monitoring board, and modifying the software program to improve the corresponding functions, safer process operations can be achieved, greatly reducing the risks of brake release overspeed and brake release over-leveling.

[0025] 2. The signal verification module described in the present invention is used to verify the communication status of the elevator mainboard in real time and calculate the communication deviation coefficient Cs; if Cs is greater than the preset deviation threshold, the communication status of the elevator mainboard is determined to be abnormal. At this time, the identified host pulse number is invalid, and the motor encoder pulse signal is re-read for identification; effectively reducing the influence of interference signals and ensuring the accuracy of signal recognition. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 The present invention is a system block diagram of a power-off brake release speed display and protection device for an elevator. DETAILED DESCRIPTION

[0028] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] like Figure 1 As shown, a power-off brake release speed display and protection device for an elevator includes an elevator mainboard, a speed monitoring board, a mainboard communication module, an electric brake release, and a signal verification module;

[0030] The elevator mainboard is used to determine the number of host pulses, thereby determining the elevator's running speed and direction, limiting the elevator's running speed to below 0.3m / s, and limiting the elevator's slipping to the door area through the leveling switch signal to prevent excessive slipping. When the elevator's running speed exceeds 0.3m / s or the elevator slips to the leveling area, the electric release output is automatically disconnected, thereby realizing slipping display and protection.

[0031] The speed monitoring board is used to monitor the elevator running speed; the speed monitoring board is connected to the electric release brake and is used to provide power for the electric release brake, specifically:

[0032] When the elevator is operating normally, the speed monitoring board does not provide power;

[0033] When the electric brake is released, the speed monitoring board outputs ±12V for power supply;

[0034] When the elevator running speed exceeds the preset threshold, the speed monitoring board is disconnected from the electric release brake, and the electric release brake cannot output the release power;

[0035] The mainboard communication module is used to feed back the PG card signal through power supply and output the motor encoder pulse signal to the elevator mainboard to realize the display of speed and direction;

[0036] When using the release function of the electric release, switch the release switch and long press the release button. At this time, the speed monitoring board outputs ±12V for power supply, the electric release outputs the release power supply, and the brake is released; when the elevator speed exceeds 0.3m / s or the elevator slides to the leveling area, the electric release output will be automatically disconnected to realize the arrival stop function;

[0037] Because the elevator mainboard is often affected by external interference information when reading the motor encoder pulse signal and judging the host pulse number, which affects the accuracy of signal recognition;

[0038] In an optional embodiment, in order to reduce the influence of interference signals and ensure the accuracy of signal recognition, the elevator mainboard is connected to a signal verification module; the signal verification module is used to verify the communication status of the elevator mainboard in real time; the specific verification steps are:

[0039] The signal verification module sends a verification configuration message to the FPGA master control of the elevator mainboard according to a preset verification period, wherein the verification configuration message includes a first signal quality threshold;

[0040] In response to receiving the verification configuration message sent by the signal verification module, the FPGA master control of the elevator mainboard sends a second synchronization signal to the signal verification module;

[0041] In response to monitoring the second synchronization signal, the signal verification module determines the signal quality of the second synchronization signal and compares the signal quality of the second synchronization signal with the first signal quality threshold to obtain a corresponding quality difference value ZC. It should be understood by those skilled in the art that any metric known in the art can be used to characterize signal quality, such as RSRQ, RSRP, RSSI, etc. The quality difference value here can reflect the attenuation of the signal during transmission.

[0042] The response time XT is calculated by calculating the time difference between the time when the signal verification module sends the verification configuration message and the time when the signal verification module again monitors the second synchronization signal. The signal loss index TX is calculated using the formula SH = ZC × a1 + XT × a2, where a1 and a2 are coefficient factors.

[0043] Create a curve graph showing the change of the signal loss index TX over time, and compare the signal loss index TX with a preset loss threshold; if TX is greater than the preset loss threshold, intercept the corresponding curve segment in the corresponding curve graph and mark it as a deviation curve segment;

[0044] Within a preset time period, the number of deviation curve segments is counted as P1; all deviation curve segments are integrated over time to obtain the deviation reference area M1; the communication deviation coefficient Cs is calculated using the formula Cs = C1 × g1 + M1 × g2, where g1 and g2 are coefficient factors;

[0045] Compare the communication deviation coefficient Cs with the preset deviation threshold; if Cs is greater than the preset deviation threshold, it is determined that the communication status of the elevator mainboard is abnormal at this time, and the identified host pulse number is invalid at this time, and the motor encoder pulse signal is read again for identification;

[0046] The present invention combines the electric brake release power supply with the existing button, adds a speed monitoring board, and improves the functions accordingly by modifying the software program, which can achieve safer process operation and greatly reduce the risks of brake release overspeed and brake release over-leveling.

[0047] The above formulas are all calculated by removing dimensions and taking their numerical values. The formula is a formula that is closest to the actual situation obtained by collecting a large amount of data and performing software simulation. The preset parameters and preset thresholds in the formula are set by technicians in this field according to actual conditions or obtained by simulating a large amount of data.

[0048] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0049] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to specific embodiments. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A power-off brake release speed display and protection device for an elevator, characterized in that: Including elevator main board, speed monitoring board, main board communication module, electric release and signal verification module; The speed monitoring board is used to monitor the elevator running speed; when the elevator running speed exceeds 0.3m / s or the elevator slides to the leveling area, the elevator main board will automatically disconnect the electric release output; The mainboard communication module is used to feed back the PG card signal through power supply and output the motor encoder pulse signal to the elevator mainboard to realize the display of speed and direction; The elevator mainboard is used to determine the host pulse number based on the received motor encoder pulse signal, thereby determining the elevator running speed and direction, limiting the elevator running speed to below 0.3m / s, and limiting the elevator slipping to the door area through the leveling switch signal; The elevator mainboard is connected to a signal verification module; the signal verification module is used to verify the communication status of the elevator mainboard in real time and calculate the communication deviation coefficient Cs; the specific verification steps are: The signal verification module sends a verification configuration message to the FPGA master control of the elevator mainboard according to a preset verification period, wherein the verification configuration message includes a first signal quality threshold; In response to receiving the verification configuration message sent by the signal verification module, the FPGA master control of the elevator mainboard sends a second synchronization signal to the signal verification module; In response to monitoring the second synchronization signal, the signal verification module determines the signal quality of the second synchronization signal and compares the signal quality of the second synchronization signal with the first signal quality threshold to obtain a corresponding quality difference ZC; The response time XT is calculated by calculating the time difference between the time when the signal verification module sends the verification configuration message and the time when the signal verification module again monitors the second synchronization signal. The signal loss index TX is calculated using the formula SH = ZC × a1 + XT × a2, where a1 and a2 are coefficient factors. Create a curve graph showing the change of the signal loss index TX over time, and compare the signal loss index TX with a preset loss threshold; if TX is greater than the preset loss threshold, intercept the corresponding curve segment in the corresponding curve graph and mark it as a deviation curve segment; In a preset time period, the number of deviation curve segments is counted as P1; all deviation curve segments are integrated over time to obtain a deviation reference area M1; The communication deviation coefficient Cs is calculated using the formula Cs=P1×g1+M1×g2; where g1 and g2 are coefficient factors; If Cs is greater than the preset deviation threshold, the communication status of the elevator mainboard is determined to be abnormal. At this time, the identified host pulse number is invalid, and the motor encoder pulse signal is re-read for identification.

2. The elevator power-off brake release speed display and protection device according to claim 1, characterized in that: The speed monitoring board is connected to the electric release brake and is used to provide power to the electric release brake. Specifically, when the elevator is operating normally, the speed monitoring board does not provide power; When the electric brake is released, the speed monitoring board outputs ±12V for power supply; When the elevator running speed exceeds the preset threshold, the speed monitoring board is disconnected from the electric release brake, and the electric release brake cannot output the release power.

3. The elevator power-off brake release speed display and protection device according to claim 1, characterized in that: When using the release function of the electric release, switch the release switch and press and hold the release button. At this time, the speed monitoring board outputs ±12V for power supply, the electric release outputs the release power supply, and the brake is released; when the elevator speed exceeds 0.3m / s or the elevator slides to the leveling area, the electric release output will be automatically disconnected to realize the arrival stop function.

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