Elevator tensioning wheel device position and switch monitoring device

Abstract

The utility model provides elevator tensioning wheel device position and switch monitoring devices, monitoring devices include for measuring elevator tensioning wheel position's distance measurement unit, distance measurement unit includes the linear displacement sensor of installation in elevator pit, and the detection end of linear displacement sensor points to the lowest point or wheel axle center point of tensioning wheel, to make monitoring devices real -time measurement linear displacement sensor to tensioning wheel lowest point or wheel axle center point's distance L, monitoring devices still include position switch state monitoring unit, and position switch state monitoring unit is connected with the position switch of tensioning wheel original device to detect the trigger state of this position switch, when the distance L of monitoring devices measurement and the trigger state of position switch do not match, monitoring devices judges that the position switch of tensioning wheel original device has the fault, the utility model can be used for real -time monitoring elevator speed limiter tensioning wheel ground clearance and its related position switch state.

Description

Technical Field

[0001] This utility model relates to the field of elevator technology, and in particular to a monitoring device for the location and switch of an elevator tensioner. Background Technology

[0002] The tensioning pulley of the elevator speed governor is used to tension the governor's wire rope, ensuring that the governor accurately reflects the car speed. The tensioning pulley must maintain an appropriate height (or tension) above the ground to ensure its proper function. Position switches (such as rope breakage switches and slack rope switches) are installed below or near the tensioning pulley. When the tensioning pulley drops below a set threshold due to wire rope slack, breakage, or pulley malfunction, these switches are triggered, cutting off the elevator safety circuit and stopping the elevator to prevent accidents. However, these switches are susceptible to environmental factors (dust, oil), mechanical wear, contact oxidation, or adhesion, leading to malfunctions (unexplained elevator stoppage) or failure to activate (no activation in dangerous situations). The original tensioning pulley components could not monitor the tensioning pulley's height above the ground and the specific values ​​and trends of the position switches in real time, thus lacking early warning capabilities. Typically, the switch function can only be checked during routine maintenance or when a significant drop in the tensioning pulley is detected, lacking a proactive early warning mechanism.

[0003] This invention provides an intelligent detection and monitoring device that can monitor the height of an elevator tensioner wheel off the ground in real time and accurately, and can simultaneously monitor the status of related position switches, enabling early warning and accurate fault diagnosis of the tensioner wheel. Utility Model Content

[0004] This utility model proposes a monitoring device for the position and switch of an elevator tensioner, which can be used to monitor in real time the height of the elevator speed governor tensioner from the ground and the status of its related position switches.

[0005] The present invention adopts the following technical solution.

[0006] An elevator tensioner device position and switch monitoring device includes a distance measurement unit for measuring the position of the elevator tensioner. The distance measurement unit includes a linear displacement sensor installed in the elevator pit. The detection end of the linear displacement sensor points to the lowest point of the tensioner or the center point of the axle, allowing the monitoring device to measure the distance L from the linear displacement sensor to the lowest point or the center point of the axle in real time. The monitoring device also includes a position switch status monitoring unit connected to the original position switch of the tensioner to detect the triggering state of the position switch. When the distance L measured by the monitoring device does not match the triggering state of the position switch, the monitoring device determines that the original position switch of the tensioner is faulty.

[0007] The linear displacement sensor is a rod-type linear displacement sensor, which includes an aluminum housing, a multi-contact brush, a resistor substrate, a stainless steel rod, and a shaft end sealing ring.

[0008] The linear displacement sensor is powered by DC 5V. The brown cable connects to the +5V power supply, the blue cable connects to the 0V power supply, and the black cable is for signal output (0-5V). When the lever is in its original position, the output voltage is 0V; when the lever is extended by 150mm, the output voltage is 5V.

[0009] A linear displacement sensor primarily converts the linear movement of a physical position into an electrical signal (voltage, current, or digital signal) that can be processed by an electronic system. It works by moving a brush (sliding contact) along a resistive track, changing the output resistance ratio, and thus outputting a voltage signal proportional to the position. This sensor can perform direct and absolute measurements of displacement and length.

[0010] The directional displacement of the linear sensor is directly proportional to its output voltage signal. The linear sensor is connected to the data acquisition unit of the monitoring device through a standard analog signal output port.

[0011] After the monitoring device is installed and adjusted under normal operating conditions of the tension wheel, the position of the linear displacement sensor is calibrated to zero, corresponding to an analog value of 0V. When the tension wheel swing arm is pressed down, the range of the analog value output by the linear displacement sensor changes with the amplitude of the swing arm's movement.

[0012] The linear displacement sensor has a maximum stroke of 150mm and outputs an analog signal of 5V at its maximum stroke.

[0013] When the monitoring device is used to monitor the position of the tensioner wheel in real time, the monitoring device stores the safety distance threshold between the linear displacement sensor and the monitoring point of the tensioner wheel.

[0014] The detection end of the linear sensor is connected to the swing plate of the tensioning wheel through an L-shaped connecting plate, so as to detect the position of the tensioning wheel by the displacement of the L-shaped connecting plate, and is fixed with bolt fasteners.

[0015] The linear displacement sensor is fixed on a 230x176x3mm metal plate, and the six holes on the side of the metal plate are connected to the pressure plate screws of the elevator T-shaped guide rail.

[0016] When the position switch of the tension wheel original device is a mechanical micro switch, the position switch status monitoring unit of the monitoring device includes a magnet located at the lever arm of the movable part of the mechanical micro switch, and also includes a Hall sensor located on the outside of the lever arm. The Hall sensor is used to detect the movement of the lever arm during the triggering process of the mechanical micro switch.

[0017] The magnet is a miniature neodymium magnet, which is attached to the lever arm of the movable part of the mechanical micro switch.

[0018] The position switch status monitoring unit of the monitoring device is a unipolar Hall effect switch. When the mechanical micro switch is triggered, causing a change in the position of the magnet, the unipolar Hall effect switch outputs a corresponding level signal.

[0019] The displacement sensor used is a KTC rod linear displacement sensor.

[0020] This invention proposes an intelligent detection and monitoring device that can monitor the height of the elevator tensioner wheel off the ground in real time and accurately, and can simultaneously monitor the status of related position switches, enabling early warning and accurate fault diagnosis. Attached Figure Description

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0022] Appendix Figure 1 This is a schematic diagram of the connection between the L-shaped bracket and the linear displacement sensor in an embodiment of this utility model;

[0023] Appendix Figure 2 This is a schematic diagram of the installation of the displacement sensor at the elevator preload wheel in an embodiment of this utility model;

[0024] Appendix Figure 3 This is a schematic diagram of the position switch status monitoring unit located at the mechanical micro switch in this embodiment of the present invention;

[0025] Appendix Figure 4 This is a schematic diagram of the wiring between the sensor and the signal acquisition unit in an embodiment of this utility model;

[0026] Appendix Figure 5 This is a schematic diagram of the Hall sensor detection circuit of the position switch status monitoring unit in this embodiment of the present invention;

[0027] Appendix Figure 6 This is a schematic diagram of the structural principle of the main control unit in an embodiment of this utility model;

[0028] In the diagram: 1-Linear displacement sensor; 2-L-shaped bracket; 3-Swing plate; 4-Tensioner wheel; 5-Metal plate; 6-Elevator T-shaped guide rail; 7-Position switch of the original tensioner wheel device; 8-Position switch status monitoring unit; 9-Magnet; 10-Monopole Hall effect switch. Detailed Implementation

[0029] As shown in the figure, the elevator tensioner device position and switch monitoring device includes a distance measurement unit for measuring the position of the elevator tensioner. The distance measurement unit includes a linear displacement sensor 1 installed in the elevator pit. The detection end of the linear displacement sensor points to the lowest point of the tensioner 4 or the center point of the axle, so that the monitoring device can measure the distance L from the linear displacement sensor to the lowest point of the tensioner or the center point of the axle in real time. The monitoring device also includes a position switch status monitoring unit 8, which is connected to the position switch 7 of the original tensioner device to detect the triggering state of the position switch. When the distance L measured by the monitoring device does not match the triggering state of the position switch, the monitoring device determines that the position switch of the original tensioner device is faulty.

[0030] The linear displacement sensor is a rod-type linear displacement sensor, which includes an aluminum housing, a multi-contact brush, a resistor substrate, a stainless steel rod, and a shaft end sealing ring.

[0031] The linear displacement sensor is powered by DC 5V. The brown cable connects to the +5V power supply, the blue cable connects to the 0V power supply, and the black cable is for signal output (0-5V). When the lever is in its original position, the output voltage is 0V; when the lever is extended by 150mm, the output voltage is 5V.

[0032] A linear displacement sensor primarily converts the linear movement of a physical position into an electrical signal (voltage, current, or digital signal) that can be processed by an electronic system. It works by moving a brush (sliding contact) along a resistive track, changing the output resistance ratio, and thus outputting a voltage signal proportional to the position. This sensor can perform direct and absolute measurements of displacement and length.

[0033] The directional displacement of the linear sensor is directly proportional to its output voltage signal. The linear sensor is connected to the data acquisition unit of the monitoring device through a standard analog signal output port.

[0034] After the monitoring device is installed and adjusted under normal operating conditions of the tension wheel, the position of the linear displacement sensor is calibrated to zero, corresponding to an analog value of 0V. When the tension wheel swing arm is pressed down, the range of the analog value output by the linear displacement sensor changes with the amplitude of the swing arm's movement.

[0035] The linear displacement sensor has a maximum stroke of 150mm and outputs an analog signal of 5V at its maximum stroke.

[0036] When the monitoring device is used to monitor the position of the tensioner wheel in real time, the monitoring device stores the safety distance threshold between the linear displacement sensor and the monitoring point of the tensioner wheel.

[0037] The detection end of the linear sensor is connected to the swing plate 3 of the tensioning wheel through the L-shaped connecting plate 2, so as to detect the position of the tensioning wheel by the displacement of the L-shaped connecting plate, and is fixed with bolt fasteners.

[0038] The linear displacement sensor is fixed on a 230x176x3mm metal plate 5, and the six holes on the side of the metal plate are connected to the pressure plate screws of the elevator T-shaped guide rail 6.

[0039] When the position switch of the tension wheel original device is a mechanical micro switch, the position switch status monitoring unit of the monitoring device includes a magnet 9 located at the lever arm of the movable part of the mechanical micro switch, and also includes a Hall sensor located on the outside of the lever arm. The Hall sensor is used to detect the movement of the lever arm during the triggering process of the mechanical micro switch.

[0040] The magnet is a miniature neodymium magnet, which is attached to the lever arm of the movable part of the mechanical micro switch.

[0041] The position switch status monitoring unit of the monitoring device is a unipolar Hall effect switch 10. When the mechanical micro switch is triggered, causing the position of the magnet to change, the unipolar Hall effect switch outputs a corresponding level signal.

[0042] The displacement sensor uses a KTC rod linear displacement sensor, with its probe end inserted into the notch of the L-shaped connecting plate.

[0043] Example:

[0044] This example presents a monitoring device for the position and switch status of an elevator tensioner, which consists of a main control unit, a distance measurement unit, a position switch status detection unit, a signal acquisition unit, and a power supply circuit.

[0045] The main control unit consists of a processing chip Ai-M61-32S, a 485 interface circuit, an Ethernet interface circuit, a Type-C interface circuit, and an I / O interface circuit.

[0046] The Ai-M61-32S, as the core processor, supports Wi-Fi 802.11b / g / n / ax and BLE protocols, and also supports the Thread protocol. The BL618 system includes a low-power 32-bit RISC-V CPU with a floating-point unit, DSP unit, cache, and memory, with a maximum clock speed of 320MHz. The Ai-M61-32S module features a rich set of peripheral interfaces, including Camera, MJPEG, Display, Audio Codec, USB 2.0, SDU, Ethernet (EMAC), SD / MMC (SDH), SPI, UART, I2C, I2S, PWM, GPDAC, GPADC, ACOMP, and GPIO. It is applied in fields such as the Internet of Things (IoT), mobile devices, and intelligent measurement and control.

[0047] The main control unit's processing chip primarily receives real-time ground clearance signals from the tensioner wheel distance sensor, switch status signals from the position switch status detection unit, and stores preset safety height thresholds, theoretical trigger height thresholds for the position switches, and historical data. It compares the current ground clearance of the tensioner wheel with the lower and upper safety limits in real time. If the current height < the lower safety limit or the current height > the upper safety limit, it indicates an abnormal tensioner wheel height (too loose or too tight). It also compares the current position switch height on the tensioner wheel with the theoretical trigger height of the position switch and makes logical judgments based on the real-time ground clearance of the tensioner wheel, specifically:

[0048] When the distance measurement unit detects that the current height is significantly lower than the theoretical trigger height of the position switch, but the position switch status still shows "not triggered" (e.g., 0), the position switch is determined to be faulty (refusal to operate). When the distance measurement unit detects that the current height is higher than the theoretical trigger height of the position switch, but the position switch status shows "triggered" (e.g., 1), the position switch is determined to be faulty (maloperation) or its circuit is faulty. The processing unit can store and record historical distance data, switch action records, and health status change data. This data is sent to the elevator control system (ECU), remote monitoring platform, or maintenance personnel's handheld terminal via communication interfaces (such as RS485, Ethernet, wireless module).

[0049] The linear displacement sensor in the distance measurement unit of this example is mainly used to convert the linear movement of a physical position into an electrical signal (voltage, current, digital signal) that can be processed by an electronic system. It works by moving a brush (sliding contact) on a resistive track, changing the output resistance ratio, and thus outputting a voltage signal proportional to the position. This sensor can perform direct and absolute measurements of displacement and length.

[0050] In this example, the device uses a KTC pull rod linear displacement sensor, installed in the elevator pit. Its detection direction is towards the lowest point of the tensioner wheel or the center point of the wheel axle, measuring the distance from itself to the lowest point of the tensioner wheel or the center point of the wheel axle in real time. The pull rod displacement sensor consists of an aluminum housing, a multi-contact brush, a resistor substrate, a stainless steel pull rod, and a shaft end sealing ring.

[0051] In this example, the linear displacement sensor is powered by DC 5V. The brown cable is connected to the +5V power supply, the blue cable to the 0V power supply, and the black cable is for signal output (0-5V). When the lever is in its original position, the output voltage is 0V; when the lever extends 150mm, the output voltage is 5V. The displacement of the linear sensor is directly proportional to the voltage, and it can be used as a standard analog signal to connect to the data acquisition unit. After the tensioner is installed and adjusted, the linear displacement sensor is calibrated to zero, corresponding to an analog signal of 0V. When the tensioner arm is pressed down, the sensor's maximum stroke is 150mm, and the analog signal is 5V. The analog signal range changes with the amplitude of the tensioner arm's swing. By setting a safety distance threshold, the position of the tensioner can be monitored in real time.

[0052] The linear displacement sensor is fixed to a 230x176x3mm steel plate. The six holes on the left side of the steel plate are connected to the pressure plate screws of the guide rail. The end of the sensor is bolted to the swing plate of the tension wheel via an L-shaped connecting plate.

[0053] In this example, the position switch status monitoring unit is deployed by intelligently upgrading the existing tension wheel position switch (such as a mechanical micro switch). This allows for non-invasive modification to achieve functions such as status monitoring and health diagnosis without replacing the original switch or altering the safety circuit. Miniature neodymium magnets are attached to the lever arm of the switch's moving part, and Hall effect sensors are installed on the outside to detect changes in the magnetic field.

[0054] In this example device, the position switch detection uses an A3144 unipolar Hall effect switch, which can operate from a power supply voltage of 3.8V to 40V, and features reverse voltage protection, temperature compensation circuitry, a small-signal amplifier, a Schmitt trigger, and an open-collector circuit. It is used for Antarctic response; when the Antarctic pole is close to the marker side, the output is low, and when it is far away, the output is high.

[0055] The signal acquisition unit in this example uses the SHZK-S2222 data acquisition unit, which is an industrial-grade data acquisition unit that supports 2 relay control outputs, 2 digital inputs, 2 analog inputs, and 2 analog outputs. The device supports Modbus RTU / ASCII / TCP protocols and is used as a slave device in the communication link. This acquisition unit communicates with the main control board and can quickly respond to data transmission.

[0056] The signal acquisition unit has the following functional characteristics:

[0057] 1) Supports 2-channel relay control output;

[0058] 2) Supports 2-channel switch input acquisition, compatible with both dry and wet nodes;

[0059] 3) Supports two channels of 4-20mA or 0-10V analog inputs; only one type of signal input is supported.

[0060] 4) Supports two channels of 4-20mA or 0-10V analog outputs; only one type of signal input is supported.

[0061] 5) Supports Modbus RTU / ASCII / TCP protocol commands;

[0062] 6) Supports custom settings for Modbus communication parameters, such as device address, baud rate, and checksum method;

[0063] 7) Supports RS485;

[0064] 8) Supports automatic DO / DI status feedback;

[0065] 9) DO control supports inching delay output;

[0066] 10) The DO control output supports power-off memory function.

[0067] The power supply circuit in this example uses the ASM1117-3.3V low dropout linear regulator chip, with a maximum output current of 1A, an output voltage accuracy of ±2%, and a stable operating voltage range of 5-12V.

Claims

1. A monitoring device for the position and switch of an elevator tensioner, characterized in that: The monitoring device includes a distance measurement unit for measuring the position of the elevator tensioner wheel. The distance measurement unit includes a linear displacement sensor installed in the elevator pit. The detection end of the linear displacement sensor points to the lowest point of the tensioner wheel or the center point of the wheel axle, so that the monitoring device can measure the distance L from the linear displacement sensor to the lowest point of the tensioner wheel or the center point of the wheel axle in real time. The monitoring device also includes a position switch status monitoring unit, which is connected to the position switch of the original tensioner wheel device to detect the triggering state of the position switch. When the distance L measured by the monitoring device does not match the triggering state of the position switch, the monitoring device determines that the position switch of the original tensioner wheel device is faulty.

2. The elevator tensioner device position and switch monitoring device according to claim 1, characterized in that: The linear displacement sensor is a rod-type linear displacement sensor, which includes an aluminum housing, a multi-contact brush, a resistor substrate, a stainless steel rod, and a shaft end sealing ring.

3. The elevator tensioner device position and switch monitoring device according to claim 1, characterized in that: The directional displacement of the linear displacement sensor is directly proportional to its output voltage signal. The linear displacement sensor is connected to the data acquisition unit of the monitoring device through a standard analog signal output port.

4. The elevator tensioner device position and switch monitoring device according to claim 1, characterized in that: After the monitoring device is installed and adjusted under normal working conditions of the tensioner, the position of the linear displacement sensor is calibrated to zero. When the tensioner arm is pressed down, the range of the analog signal output by the linear displacement sensor changes with the amplitude of the tensioner arm's swing.

5. The elevator tensioner device position and switch monitoring device according to claim 4, characterized in that: When the monitoring device is used to monitor the position of the tensioner wheel in real time, the monitoring device stores the safety distance threshold between the linear displacement sensor and the monitoring point of the tensioner wheel.

6. The elevator tensioner device position and switch monitoring device according to claim 1, characterized in that: The detection end of the linear displacement sensor is connected to the swing plate of the tensioning wheel through an L-shaped connecting plate, so as to detect the position of the tensioning wheel by the displacement of the L-shaped connecting plate.

7. The elevator tensioner device position and switch monitoring device according to claim 1, characterized in that: The linear displacement sensor is fixed on a metal plate, and multiple holes on the side of the metal plate are connected to the elevator T-shaped guide rail.

8. The elevator tensioner device position and switch monitoring device according to claim 1, characterized in that: When the position switch of the tension wheel original device is a mechanical micro switch, the position switch status monitoring unit of the monitoring device includes a magnet located at the lever arm of the movable part of the mechanical micro switch, and also includes a Hall sensor located on the outside of the lever arm. The Hall sensor is used to detect the movement of the lever arm during the triggering process of the mechanical micro switch.

9. The elevator tensioner device position and switch monitoring device according to claim 8, characterized in that: The magnet is a miniature neodymium magnet, which is attached to the lever arm of the movable part of the mechanical micro switch.

10. The elevator tensioner device position and switch monitoring device according to claim 8, characterized in that: The position switch status monitoring unit of the monitoring device is a unipolar Hall effect switch. When the mechanical micro switch is triggered, causing a change in the position of the magnet, the unipolar Hall effect switch outputs a corresponding level signal.

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