Elevator automatic detector

Abstract

An elevator automatic detector relates to elevator balance coefficient detection, which can effectively improve the automation level of the test process and the measurement accuracy. In the elevator automatic detector, the balance coefficient automatic test terminal machine includes an embedded microprocessor, and a liquid crystal display, a fourth wireless communication module, a current detection module, an HT82K629A circuit board function module and a fourth storage battery connected therewith respectively. The first wireless detection system realizes the height measurement detection of the car and the counterweight by the car pit counterweight laser ranging mode. The second wireless detection system realizes the height measurement detection of the car and the counterweight by the car and the counterweight relative alignment mode. The third wireless detection system realizes the height measurement detection of the car and the counterweight by the car pit counterweight laser ranging mode.

Description

Technical Field

[0001] This utility model relates to the field of automatic elevator detection technology, and in particular to an automatic elevator detection instrument. Background Technology

[0002] The elevator balance coefficient is one of the most important parameters of an elevator. After installation, the elevator balance coefficient needs to be measured to ensure it meets design requirements. The elevator balance coefficient directly affects the elevator's traction conditions and brake performance. A balance coefficient that is too small or too large will disrupt the balance of the elevator's traction force and require greater braking force, worsening the elevator's operating conditions. This significantly increases the probability of accidents such as slippage or bottoming out during normal operation, leading to personal injury and equipment damage. Therefore, the elevator balance coefficient should not be arbitrarily changed during its service life.

[0003] Currently, elevator inspection regulations clearly stipulate the testing methods for elevator balance coefficients. The method involves the car being loaded with 30%, 40%, 45%, 50%, and 60% of its rated load, and then running straight along its entire length. The current values ​​of the traction motor are recorded when the car reaches the same horizontal plane as the counterweight during both its ascending and descending phases. For AC motors, the balance coefficient is determined by plotting a current-load curve or speed-load curve, and the intersection of the ascending and descending running curves, using current and speed measurements in conjunction with speed measurements. For DC motors, the balance coefficient is determined by plotting a current-load curve or voltage-load curve, using current and voltage measurements in conjunction with voltage measurements.

[0004] In real-world testing, the measured value of the traction motor is not the value at the exact moment when the elevator car and counterweight are at the same height. It is an estimation, which cannot accurately determine the same horizontal position. Furthermore, the clamp-on ammeter has a low refresh rate and exhibits a certain lag. In the aforementioned testing methods, clamp-on ammeters are commonly used to measure the motor current, with inspectors visually reading the current value, resulting in a time delay. Because it requires manual observation of the moment when the car and counterweight reach the same horizontal position before issuing a command to others to read the clamp-on ammeter value, this also introduces a human time delay, leading to inaccurate current readings.

[0005] In summary, the existing indirect measurement methods are obviously cumbersome, the results are not intuitive, and the measurements are prone to deviation. Furthermore, this method requires multiple loadings, which is time-consuming, labor-intensive, and extremely inefficient, making it very unsuitable for promotion and application in periodic inspections or elevator spot checks. Utility Model Content

[0006] The purpose of this invention is to provide an automatic elevator testing instrument that can automatically identify the moment when the elevator car and counterweight are running at the same speed to the same height when the elevator car is loaded with 40% and 60% of the rated load. It uses a high-precision photoelectric sensor to accurately measure the instantaneous current value of the traction motor at that moment using a non-contact high-precision current sensor, and automatically calculates the balance coefficient using the current-load curve method, thereby effectively improving the automation level and measurement accuracy of the testing process.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: An automatic elevator testing device includes: an automatic balance coefficient testing terminal, and a first wireless testing system, a second wireless testing system, and a third wireless testing system connected to the automatic balance coefficient testing terminal via a first wireless communication module, a second wireless communication module, and a third wireless communication module, respectively. The automatic balance coefficient test terminal includes: an embedded microprocessor, and an LCD display, a fourth wireless communication module, a current detection module, an HT82K629A circuit board function module and a fourth battery respectively connected to the embedded microprocessor, and the HT82K629A circuit board function module is connected to a keyboard. The first wireless detection system detects the height between the car and the counterweight using a pit-car counterweight laser ranging method, and is based on a first wireless data acquisition microprocessor, a first battery, and a laser ranging module; the second wireless detection system detects the height between the car and the counterweight by ensuring the car and counterweight are relatively aligned, and is based on a second wireless data acquisition microprocessor, a second battery, and a laser trigger module; the third wireless detection system detects the height between the car and the counterweight using a pit-car counterweight laser ranging method, and is based on a third wireless data acquisition microprocessor, a third battery, and an encoder speed measurement module. The first, second, and third wireless detection systems detect the current value of the traction motor when the elevator car is loaded with 40% and 60% of its rated load and the counterweight height is the same during ascent and descent. After all the current detection data is obtained, the balance coefficient is automatically calculated using the current-load curve method. Based on the recorded data, the balance coefficient curve is automatically fitted, plotted, and displayed, and finally the balance coefficient of the elevator can be accurately obtained.

[0008] In practical applications, the embedded microprocessor has a VGA interface, a first USB interface, an RS232 interface, and a second USB interface. The liquid crystal display is provided with a liquid crystal display driver board and a touch screen driver board. The liquid crystal display driver board is connected to the embedded microprocessor through the VGA interface, and the touch screen driver board is connected to the embedded microprocessor through the first USB interface. The fourth wireless communication module is connected to the embedded microprocessor through the RS232 interface, and the HT82K629A circuit board functional module is connected to the embedded microprocessor through the second USB interface.

[0009] The first wireless detection system is placed in the elevator pit. When the elevator car is loaded with 40% and 60% of the rated load and runs at the upper limit of the constant speed, the laser distance sensor of the laser ranging module detects that the distance between the car and the counterweight is the same and that they are in the balance position. Then, the first wireless communication module sends the current value of the traction motor at this moment to the automatic balance coefficient test terminal placed in the machine room or outside the shaft through the first wireless communication module. The embedded microprocessor immediately detects and records the current value at this moment. The laser distance sensor is an infrared ranging sensor. During the movement of the car, the infrared ranging sensor emits infrared light at a certain frequency toward the counterweight side and the car. After being reflected by the obstacle, the light is received by the infrared ranging sensor and transmitted to the first wireless data acquisition microprocessor through analog-to-digital conversion. When the car and the counterweight are at the same horizontal position, the automatic detector obtains the distance between the car and the counterweight.

[0010] Specifically, the photoelectric signal transmitting end of the laser trigger module of the second wireless detection system is installed on the opposite surface of the car and the counterweight, and the photoelectric signal receiving end of the laser trigger module is installed on the counterweight and the corresponding surface of the car, so as to realize the height identification of the elevator car and the counterweight position; When the elevator car is loaded with 40% and 60% of its rated load and running at the upper limit at a constant speed, the photoelectric sensor of the laser trigger module detects that the car and the counterweight are at the same distance and in a balanced position. It then sends a signal through the second wireless communication module to the automatic balance coefficient test terminal located in the machine room or outside the shaft, triggering the monitoring of the current value of the traction motor at this moment. The embedded microprocessor immediately detects and records the current value at this moment. When it is identified that the car and the counterweight are at the same horizontal position, the automatic detector obtains the height position of the car and the counterweight.

[0011] Furthermore, when the elevator car is loaded with 40% and 60% of its rated load and running at the upper limit of constant speed, the encoder speed measurement module of the third wireless detection system measures the rotational speed of the traction sheave and calculates the changes in the displacement of the car and counterweight. At the same time, it measures the instantaneous current value of the traction motor when the car and counterweight run at the same speed to the same height, and automatically calculates the balance coefficient using the current-load curve method.

[0012] Furthermore, the first wireless communication module, the second wireless communication module, the third wireless communication module, and the fourth wireless communication module adopt any one of ZigBee wireless communication, WIFI wireless communication, or GPRS wireless communication.

[0013] Compared with existing technologies, the automatic elevator detector of this utility model has the following advantages: The elevator automatic testing instrument provided by this utility model includes an automatic balance coefficient testing terminal unit comprising: an embedded microprocessor, and an LCD display, a fourth wireless communication module, a current detection module, an HT82K629A circuit board function module, and a fourth battery, all connected to the embedded microprocessor. The HT82K629A circuit board function module is connected to a keyboard. The first wireless detection system detects the height of the car and counterweight using a pit-car counterweight laser ranging method, based on the first wireless data acquisition microprocessor, the first battery, and the laser ranging module. The second wireless detection system detects the height of the car and counterweight using a method where the car and counterweight are relatively aligned, based on the second... The system comprises a wireless data acquisition microprocessor, a second battery, and a laser trigger module; a third wireless detection system uses a pit-car counterweight laser ranging method to detect the height of the car and counterweight, and utilizes the third wireless data acquisition microprocessor, the third battery, and an encoder speed measurement module; the first, second, and third wireless detection systems monitor the traction motor current when the elevator is moving up and down with the car loaded at 40% and 60% of its rated load and at the same counterweight height. After all current detection data is obtained, the balance coefficient is automatically calculated using the current-load curve method, and the balance coefficient curve is automatically fitted, plotted, and displayed based on the recorded data, ultimately accurately determining the electrical balance coefficient. The elevator balance coefficient; therefore, the automatic elevator balance coefficient detector provided by this utility model, under the rated load conditions of 40% and 60%, first determines whether the elevator car is moving upward and the counterweight is moving downward at a constant speed to determine its current operating state. If the acceleration of the elevator car and the counterweight is not zero, it needs to return and wait to re-detect the operating state until the acceleration of the car and the counterweight is zero. Then, it starts detecting the upward position of the car or the downward position of the counterweight until the car and the counterweight move to the same height at a constant speed. At this moment, it measures the instantaneous three-phase current values ​​of the traction motor, calculates their average value and saves it to solve the current-load curve balance coefficient; under the rated load conditions of 40% and 60% of the elevator... Under load, the system first determines whether the elevator car is moving downwards and the counterweight is moving upwards at a constant speed to determine its current operating state. If the acceleration of the elevator car and the counterweight is not zero, it needs to return and wait to re-detect the operating state until the acceleration of the car and the counterweight is zero. Then, it starts detecting the downward position of the car or the upward position of the counterweight until the car and the counterweight move to the same height at a constant speed. At this moment, the instantaneous three-phase current values ​​of the traction motor are measured, their average value is calculated and saved, and used to solve the current-load curve balance coefficient. Finally, the balance coefficient is automatically calculated using the current-load curve method, and the elevator balance coefficient measurement result is output, effectively improving the automation level and measurement accuracy of the testing process. Attached Figure Description

[0014] Figure 1 This is a structural schematic diagram of the automatic elevator detector provided in an embodiment of the present invention.

[0015] Figure label: 1-Automatic Balance Coefficient Test Terminal; 11-Embedded Microprocessor; 12-LCD Display; 121-LCD Display Driver Board; 122-Touchscreen Driver Board; 13-Fourth Wireless Communication Module; 14-Current Detection Module; 15-HT82K629A Circuit Board Function Module; 16-Fourth Battery; 17-Keyboard; 21-First wireless communication module; 22-Second wireless communication module; 23-Third wireless communication module; 31-First wireless detection system; 311-First wireless data acquisition microprocessor; 312-First battery; 313-Laser ranging module; 32-Second wireless detection system; 321-Second wireless data acquisition microprocessor; 322-Second battery; 323-Laser trigger module; 33-Third wireless detection system; 331-Third wireless data acquisition microprocessor; 332-Third battery; 333-Encoder speed measurement module. Detailed Implementation

[0016] For ease of understanding, the automatic elevator detector provided in the embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0017] This utility model embodiment provides an automatic elevator detector, such as... Figure 1 As shown, it includes: an automatic balance coefficient test terminal 1, and a first wireless detection system 31, a second wireless detection system 32, and a third wireless detection system 33 that are connected to the automatic balance coefficient test terminal 1 through a first wireless communication module 21, a second wireless communication module 22, and a third wireless communication module 23, respectively. The automatic balance coefficient test terminal 1 includes: an embedded microprocessor 11, and an LCD display 12, a fourth wireless communication module 13, a current detection module 14, an HT82K629A circuit board function module 15, and a fourth battery 16, all connected to the embedded microprocessor 11. The HT82K629A circuit board function module 15 is connected to a keyboard 17. The first wireless detection system 31 detects the height between the car and the counterweight using a pit-car counterweight laser ranging method, and is based on a first wireless data acquisition microprocessor 311, a first battery 312, and a laser ranging module 313; the second wireless detection system 32 detects the height between the car and the counterweight by ensuring the car and counterweight are relatively aligned, and is based on a second wireless data acquisition microprocessor 321, a second battery 322, and a laser trigger module 323; the third wireless detection system 33 detects the height between the car and the counterweight using a pit-car counterweight laser ranging method, and is based on a third wireless data acquisition microprocessor 331, a third battery 332, and an encoder speed measurement module 333. The first wireless detection system 31, the second wireless detection system 32, and the third wireless detection system 33 detect the current value of the traction motor when the elevator car is loaded with 40% and 60% of the rated load and the counterweight height is the same during the elevator's ascent and descent. After all the current detection data is obtained, the balance coefficient is automatically calculated using the current-load curve method. Based on the recorded data, the balance coefficient curve is automatically fitted, drawn, and displayed, and finally the balance coefficient of the elevator can be accurately obtained.

[0018] Compared with the prior art, the automatic elevator detector described in this embodiment of the invention has the following advantages: In the elevator automatic testing instrument provided in this embodiment of the utility model, the automatic balance coefficient testing terminal 1 includes: an embedded microprocessor 11, and an LCD display 12, a fourth wireless communication module 13, a current detection module 14, an HT82K629A circuit board function module 15, and a fourth battery 16, all connected to the embedded microprocessor 11. The HT82K629A circuit board function module 15 is connected to a keyboard 17. The first wireless detection system 31 detects the height of the car and counterweight using a pit-car counterweight laser ranging method, based on the first wireless data acquisition microprocessor 311, the first battery 312, and the laser ranging module 313. The second wireless detection system 32 detects the height of the car and counterweight by means of relative alignment between the car and counterweight. The system achieves height detection of the car and counterweight, based on a second wireless data acquisition microprocessor 321, a second battery 322, and a laser trigger module 323; a third wireless detection system 33 detects the height of the car and counterweight using a pit-car counterweight laser ranging method, based on a third wireless data acquisition microprocessor 331, a third battery 332, and an encoder speed measurement module 333; the system uses the first wireless detection system 31, the second wireless detection system 32, and the third wireless detection system 33 to detect the traction motor current value when the elevator is moving up and down with the car loaded at 40% and 60% of its rated load and at the same counterweight height. After all current detection data is obtained, the balance coefficient is automatically calculated using the current-load curve method, and then... The system automatically fits, plots, and displays the balance coefficient curve based on the recorded data, ultimately accurately determining the elevator's balance coefficient. Therefore, the automatic elevator balance coefficient detector provided in this embodiment, under 40% and 60% rated load conditions, first determines whether the elevator car is moving upwards and the counterweight is moving downwards at a constant speed to ascertain its current operating state. If the acceleration of the elevator car and counterweight is not zero, it needs to return and wait to re-detect the operating state until the acceleration of the car and counterweight is zero. Then, it begins detecting the upward position of the car or the downward position of the counterweight until the car and counterweight reach the same height at a constant speed. At this moment, it measures the instantaneous three-phase current values ​​of the traction motor, calculates their average value, and saves it for solving the current-load curve balance problem. The coefficient is calculated as follows: Under 40% and 60% rated load conditions, the elevator car is first checked to determine whether it is moving downwards and the counterweight is moving upwards at a constant speed to determine its current operating state. If the acceleration of the elevator car and the counterweight is not zero, the system needs to return and wait to re-detect the operating state until the acceleration of the car and the counterweight is zero. Then, the system starts to detect the downward position of the car or the upward position of the counterweight until the car and the counterweight move to the same height at a constant speed. At this moment, the instantaneous three-phase current values ​​of the traction motor are measured, the average value is calculated and saved, and used to solve the current-load curve balance coefficient. Finally, the balance coefficient is automatically calculated using the current-load curve method, and the elevator balance coefficient measurement result is output, which effectively improves the automation level and measurement accuracy of the testing process.

[0019] In addition, the performance indicators of the automatic elevator detector provided in this utility model embodiment are: (1) the accuracy of the automatic elevator balance coefficient measuring instrument is ≥98%; (2) when the car and counterweight are at the same height, the current acquisition delay time is ≤1s.

[0020] It should be further explained here that, in the elevator automatic detection instrument provided in this embodiment of the utility model, the laser ranging method for the pit car counterweight can be as follows: The elevator car, counterweight, and hydraulic buffer are located in the shaft. Two high-precision photoelectric sensors are used to automatically identify the height of the car and counterweight from the pit floor. The travel distance and position data of the car and counterweight are collected and transmitted in real time to the wireless acquisition and transmission terminal in the pit via wires. After the distance data is packaged and processed, it is transmitted wirelessly to the elevator balance coefficient automatic measurement terminal at the edge of the shaft. Within the range where the elevator car and counterweight reach the same height, position sensors are installed on the shaft wall to read the positions of the car and counterweight. Since the area below the elevator shaft is relatively dangerous, considering the actual on-site detection conditions, the wireless acquisition and transmission terminal in the pit is designed to be battery powered, using both a battery and a 220V power supply from the site. The specific method for aligning the car and counterweight can be as follows: When the car and counterweight reach the same position, a high-precision photoelectric sensor is installed between them to automatically identify when the car and counterweight reach the same height at a constant speed. A high-precision photoelectric sensor is installed on the counterweight surface at the bottom of the elevator car, and a laser signal reflective strip is installed on the car surface at the bottom of the counterweight. When the laser emitted by the photoelectric sensor on the elevator car hits the reflective strip on the counterweight, it indicates that the elevator car and counterweight are at the same height at that moment. The wireless acquisition and transmission terminal transmits control signals, and after the distance data is packaged and processed, it is transmitted wirelessly to the elevator balance coefficient automatic measurement terminal at the hoistway perimeter. The specific method for laser ranging of the pit car counterweight can be as follows: a laser identification mark is affixed to the side of the traction sheave, or a speed measuring wheel sensor is used to make close contact with the traction sheave, which can accurately calculate the displacement change by measuring the rotational speed to determine whether the elevator car and counterweight are at the same height. When the height of the car and counterweight are equal, a non-contact high-precision current sensor is used to accurately measure the instantaneous current value of the traction motor at that moment. On the embedded elevator balance coefficient automatic measurement system terminal, the balance coefficient is automatically calculated using the current-load curve method. Considering the problem of power supply difficulties in the elevator machine room, the elevator balance coefficient automatic measurement system terminal adopts a battery and on-site 220V power supply mode.

[0021] In practical applications, such as Figure 1 As shown, the embedded microprocessor 11 described above may have a VGA interface, a first USB interface, an RS232 interface, and a second USB interface. The LCD display 12 may be equipped with an LCD driver board 121 and a touch screen driver board 122. The LCD driver board 121 can be connected to the embedded microprocessor 11 through a VGA interface, and the touch screen driver board 122 can be connected to the embedded microprocessor 11 through a first USB interface. The fourth wireless communication module 13 can be connected to the embedded microprocessor 11 via an RS232 interface, and the HT82K629A circuit board function module 15 can be connected to the embedded microprocessor 11 via a second USB interface.

[0022] The first wireless detection system 31 is placed in the elevator pit. When the elevator car is loaded with 40% and 60% of the rated load and runs at the upper limit of the constant speed, the laser distance sensor of the laser ranging module 313 detects that the distance between the car and the counterweight is the same and that they are in the balance position. Then, the first wireless communication module 21 sends the current value of the traction motor at this moment to the balance coefficient automatic test terminal 1 placed in the machine room or outside the shaft. The embedded microprocessor 11 immediately detects and records the current value at this moment. The laser distance sensor can be an infrared ranging sensor. During the movement of the car, the infrared ranging sensor emits infrared light at a certain frequency toward the counterweight side and the car. After being reflected by the obstacle, the light is received by the infrared ranging sensor and transmitted to the first wireless data acquisition microprocessor 311 through analog-to-digital conversion. When the car and the counterweight are at the same horizontal position, the automatic detector obtains the distance between the car and the counterweight.

[0023] When using laser rangefinders to measure distances, different types of laser rangefinders have their own unique characteristics. For detecting the unknown position of the elevator car counterweight within the hoistway, distance measurements need to be performed within a range of tens to hundreds of meters. Furthermore, the small area of ​​the counterweight's bottom necessitates aiming and detection from a considerable distance. Laser rangefinders can effectively meet the requirements for detecting the position of the elevator car and counterweight's bottom, and therefore require specific performance characteristics. The LRFS-0040-1 laser rangefinder is specifically designed for measuring the distance to both solid and moving objects. Based on parameters such as range, the LRFS-0040-1 laser motion sensor is selected, as its range, operating voltage, and interface type all meet the detection requirements.

[0024] Specifically, the photoelectric signal transmitting end of the laser trigger module 323 of the second wireless detection system 32 is installed on the opposite side of the car and the counterweight, and the photoelectric signal receiving end of the laser trigger module 323 is installed on the counterweight and the corresponding side of the car, so as to realize the height recognition of the elevator car and the counterweight position. When the elevator car is loaded with 40% and 60% of its rated load and running at the upper limit at a constant speed, the photoelectric sensor of the laser trigger module 323 detects that the car and the counterweight are at the same distance and in a balanced position. It then sends a signal to the automatic balance coefficient test terminal 1 located in the machine room or outside the shaft via the second wireless communication module 22, triggering the monitoring of the current value of the traction motor at this moment. The embedded microprocessor 11 immediately detects and records the current value at this moment. When it is identified that the car and the counterweight are at the same horizontal position, the automatic detector obtains the height position of the car and the counterweight.

[0025] A miniature photoelectric trigger detects the state of light obstruction by an object using a photosensitive material, intelligently analyzes and transmits this information, and thus detects the presence of an object in a specific physical space. Based on this principle, this method can detect all light-reflecting objects and avoids frictional contact between the object and the detection device, expanding the detection range and protecting elevator cars and counterweights. The switch mainly consists of a signal transmitter and a receiver. It detects the presence of obstructions or reflective objects in the space between the two ends by measuring whether the transmission of the light signal is blocked at both ends. The input of the light signal requires a converter to convert the electrical signal into a light signal. After reception, the corresponding control commands are converted back into electrical signals.

[0026] Furthermore, when the elevator car is loaded with 40% and 60% of its rated load and running at the upper limit of constant speed, the encoder speed measurement module 333 of the third wireless detection system 33 measures the rotational speed of the traction sheave and calculates the changes in the displacement of the car and counterweight. At the same time, it measures the instantaneous current value of the traction motor when the car and counterweight run at the same speed to the same height, and automatically calculates the balance coefficient using the current-load curve method.

[0027] Encoder-type speed sensors can employ magnetoelectric speed sensors. Each magnetic speed sensor uses the principle of electromagnetic induction to measure speed. A coil is wound at the front end of the sensor. When the gear rotates, the magnetic field lines passing through the sensor coil change, generating a periodic voltage in the sensor coil. By processing and counting this voltage, the gear speed can be measured. This sensor features: small size, robustness, no need for power supply or lubrication, and compatibility with general secondary instruments; the housing is made of stainless steel, providing a strong output signal, good anti-interference performance, and easy installation and use; it can be used in harsh environments such as smoke, oil vapor, and water vapor. Due to the advanced technology and materials used, the magnetoelectric speed sensor has similar sensitivity to similar products and can be used with SZC series tachometers; the sensor housing is made of M16×1 stainless steel tubing, with a 3.5mm pure iron front end, housing the coil, etc., and encapsulated in epoxy resin; the sensor leads use an X12K4P aviation connector, with the socket portion machined and encapsulated in a stainless steel threaded tube, connecting the four terminals, allowing the connector leads to be connected to any two adjacent terminals.

[0028] Furthermore, the first wireless communication module 21, the second wireless communication module 22, the third wireless communication module 23 and the fourth wireless communication module 13 mentioned above can adopt any one of ZigBee wireless communication, WIFI wireless communication or GPRS wireless communication.

[0029] ZigBee wireless communication performance characteristics: ZigBee is a short-range, low-complexity, low-power, low-data-rate, and low-cost bidirectional wireless communication technology. It is a set of communication technologies developed based on the IEEE 802.15.4 wireless standard, covering networking, security, and application software. The characteristics of ZigBee technology itself determine its application scenarios, which mainly include a large number of network points requiring data acquisition or monitoring, and a relatively small amount of data to be transmitted. ZigBee wireless networks can operate on the 2.4 GHz frequency band, with a maximum transmission rate of up to 250 Kbit / s and a transmission distance of 0–75m. A single ZigBee network can accommodate up to 254 slave devices and 1 master device, and its corresponding chip, CC2530, integrates the core of a 51 microcontroller, facilitating simple development and control.

[0030] Wi-Fi wireless communication performance characteristics: Wi-Fi is a wireless network composed of an access point (AP) and a wireless network card. It is a technology that enables personal computers, PDAs, and other terminals to connect to each other wirelessly. Wi-Fi is a mainstream technology standard in WLAN (Wireless Local Area Network) access and is an industry standard for wireless network communication defined by the IEEE (IEEE Communications Technology Center). 802.11, including 802.11a, b, g, n, etc.; WIFI is a short-range wireless transmission technology that supports devices within a range of 0-100m to access the wireless network, with high-power WIFI devices covering a range of 0-400m; WIFI's biggest advantage is its high transmission rate, reaching up to 54Mbps. In situations with weak signals or interference, the bandwidth can be adjusted, effectively ensuring network stability and reliability; WIFI wireless networks are easy to set up and conveniently connect to Ethernet; setting up a high-power wireless router in a certain location allows WIFI devices within a 400m range to access the wireless network, which can then be easily connected to Ethernet after conversion, enabling wireless communication within the area; Furthermore, WIFI wireless networks employ the widely used WPA-PSK (TKIP) and WPA2-PSK (AES) encryption methods, ensuring secure and reliable data transmission.

[0031] GPRS wireless communication performance characteristics: GPRS is a standard for packet data in the European Telecommunications Association's GSM system, providing an air interface transmission rate of up to 115 Kb / s. GPRS allows several mobile users to share a single wireless channel simultaneously, and a single mobile user can use multiple wireless channels. Users who do not actually send or receive data packets occupy only a small portion of network resources. GPRS achieves high-speed access through channel bonding and enhanced data rate improvements. Currently, GPRS designs can bond data across one carrier frequency or eight channels, increasing the transmission rate of each channel to 14.4 Kb / s. Therefore, the maximum rate of GPRS is 8 × 14.4 = 115 Kb / s. The second step in GPRS development was to improve transmission performance by increasing the data rate, i.e., increasing the rate of each channel to 48Kb / s. Therefore, the design rate of the second-generation GPRS was 384Kb / s. To implement GPRS, three new logical network entities need to be introduced into the existing GSM network: Serving GPRS Support Node (SGSN), Gateway GPRS Support Node (GGSN), and Packet Control Unit (PCU). The SGSN provides the interaction between the GPRS network and the external packet data network. In the base station subsystem, the PCU is responsible for managing packet segmentation and planning, radio channels, transmission error detection and automatic retransmission, channel coding schemes, quality control, power control, etc.

[0032] Furthermore, since the distance detection system placed on the car top moves with the car, wireless communication is used to realize its data transmission with the main control system. The PTR2000 chip is selected as the wireless data transmission module in this system. The main peripheral circuits of the wireless communication module are as follows: (1) the connection circuit with the microcontroller. The RXD and TXD pins of the AT89C51 are directly connected to the DO and DI pins of the PTR2000 module, and the mode control pin of the PTR2000 is connected to the control pin of the microcontroller; (2) the connection circuit with the PCM-9361 computer. The MAX202 device is used to convert the RS232 serial port of the PCM-9361 and the PTR2000 module to RS232 and TTL levels. Its input and output signals are connected to the DO and DI of the PTR2000, and the converted signals are directly connected to the RS232 serial port of the PCM-9361.

[0033] When measuring the elevator balance coefficient, because it is constantly changing, it is necessary to monitor the position of the elevator car and counterweight in real time. The characteristic of the pit-car-counterweight laser ranging method is that the position data of the car and counterweight monitored in the pit needs to be transmitted to the automatic elevator balance coefficient measurement terminal in the machine room. The characteristic of the car-counterweight alignment method is that the elevator car and counterweight are constantly moving up and down in real time, requiring the transmission of their position data to the automatic elevator balance coefficient measurement terminal in the machine room. The characteristic of the elevator traction sheave speed-displacement calculation method is that the rotational speed of the traction sheave is measured in real time in the machine room, and then its rotational speed is converted into the displacement of the elevator car and counterweight through calculation. In summary, all three methods for measuring the position of the elevator car and counterweight require transmitting the monitored elevator car and counterweight position data to the automatic elevator balance coefficient measurement terminal in the machine room, which is quite difficult. Therefore, this application chooses wireless communication to transmit the position monitoring point data to the automatic elevator balance coefficient measurement terminal, which is convenient for on-site installation and use, and reduces the cost of testing instruments. The actual on-site testing and usage steps are as follows: First, complete the installation and fixation of the elevator car and counterweight position detection module and the traction sheave motor current detection module, and turn on the power of the wireless monitoring point module to put it into standby mode; then, turn on the remote elevator balance coefficient automatic measurement terminal, search for the wireless signal transmitted by the monitoring point and pair and connect with it. If the wireless signal transmitted by the car and counterweight position wireless monitoring point cannot be found, it is necessary to search again; otherwise, stop searching. If the connection is successful, wait for the test to begin, enter the elevator balance coefficient detection interface, and wait for the elevator balance coefficient to be measured.

[0034] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. An automatic elevator detector, characterized in that it comprises: An automatic balance coefficient testing terminal, and a first wireless detection system, a second wireless detection system, and a third wireless detection system connected to the automatic balance coefficient testing terminal via a first wireless communication module, a second wireless communication module, and a third wireless communication module, respectively; The automatic balance coefficient test terminal includes: an embedded microprocessor, and an LCD display, a fourth wireless communication module, a current detection module, an HT82K629A circuit board function module and a fourth battery respectively connected to the embedded microprocessor, and the HT82K629A circuit board function module is connected to a keyboard. The first wireless detection system detects the height between the car and the counterweight using a pit-car counterweight laser ranging method, and is based on a first wireless data acquisition microprocessor, a first battery, and a laser ranging module; the second wireless detection system detects the height between the car and the counterweight by ensuring the car and counterweight are relatively aligned, and is based on a second wireless data acquisition microprocessor, a second battery, and a laser trigger module; the third wireless detection system detects the height between the car and the counterweight using a pit-car counterweight laser ranging method, and is based on a third wireless data acquisition microprocessor, a third battery, and an encoder speed measurement module. The first, second, and third wireless detection systems detect the current value of the traction motor when the elevator car is loaded with 40% and 60% of its rated load and the counterweight height is the same during ascent and descent. After all the current detection data is obtained, the balance coefficient is automatically calculated using the current-load curve method. Based on the recorded data, the balance coefficient curve is automatically fitted, plotted, and displayed, and finally the balance coefficient of the elevator can be accurately obtained.

2. The automatic elevator detector according to claim 1, characterized in that, The embedded microprocessor has a VGA interface, a first USB interface, an RS232 interface, and a second USB interface. The liquid crystal display is provided with a liquid crystal display driver board and a touch screen driver board. The liquid crystal display driver board is connected to the embedded microprocessor through the VGA interface, and the touch screen driver board is connected to the embedded microprocessor through the first USB interface. The fourth wireless communication module is connected to the embedded microprocessor through the RS232 interface, and the HT82K629A circuit board functional module is connected to the embedded microprocessor through the second USB interface.

3. The automatic elevator detector according to claim 2, characterized in that, The first wireless detection system is placed in the elevator pit. When the elevator car is loaded with 40% and 60% of the rated load and runs at the upper limit of the constant speed, the laser distance sensor of the laser ranging module detects that the distance between the car and the counterweight is the same and that they are in the balance position. Then, the first wireless communication module sends the current value of the traction motor at this moment to the automatic balance coefficient test terminal placed in the machine room or outside the shaft through the first wireless communication module. The embedded microprocessor immediately detects and records the current value at this moment. The laser distance sensor is an infrared ranging sensor. During the movement of the car, the infrared ranging sensor emits infrared light at a certain frequency toward the counterweight side and the car. After being reflected by the obstacle, the light is received by the infrared ranging sensor and transmitted to the first wireless data acquisition microprocessor through analog-to-digital conversion. When the car and the counterweight are at the same horizontal position, the automatic detector obtains the distance between the car and the counterweight.

4. The automatic elevator detector according to claim 2, characterized in that, The photoelectric signal transmitting end of the laser trigger module of the second wireless detection system is installed on the opposite surface of the car and the counterweight, and the photoelectric signal receiving end of the laser trigger module is installed on the counterweight and the corresponding surface of the car, so as to realize the height identification of the elevator car and the counterweight position; When the elevator car is loaded with 40% and 60% of its rated load and running at the upper limit at a constant speed, the photoelectric sensor of the laser trigger module detects that the car and the counterweight are at the same distance and in a balanced position. It then sends a signal through the second wireless communication module to the automatic balance coefficient test terminal located in the machine room or outside the shaft, triggering the monitoring of the current value of the traction motor at this moment. The embedded microprocessor immediately detects and records the current value at this moment. When it is identified that the car and the counterweight are at the same horizontal position, the automatic detector obtains the height position of the car and the counterweight.

5. The automatic elevator detector according to claim 2, characterized in that, When the elevator car is loaded with 40% and 60% of its rated load and runs at the upper limit of constant speed, the encoder speed measurement module of the third wireless detection system measures the rotational speed of the traction sheave and calculates the changes in the displacement of the car and counterweight. At the same time, it measures the instantaneous current value of the traction motor when the car and counterweight run at the same speed to the same height, and automatically calculates the balance coefficient using the current-load curve method.

6. The automatic elevator detector according to claim 1, characterized in that, The first wireless communication module, the second wireless communication module, the third wireless communication module, and the fourth wireless communication module adopt any one of ZigBee wireless communication, WIFI wireless communication, or GPRS wireless communication.

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