LabVIEW-based falling test measurement system and method for anti-falling safety device of construction hoist

Abstract

The invention discloses a LabVIEW-based building hoist anti-falling safety device falling test measurement system, which comprises an upper computer, an emitter and a receiver, and is characterized in that the upper computer is connected with the receiver, the emitter is installed on a direct output gear of an anti-falling safety device, and the original data of the angular velocity of the rotation of the direct output gear of the anti-falling safety device is measured; the angular velocity sensor is used for acquiring the angular velocity original data and transmitting the angular velocity original data to the upper computer through the receiver, the upper computer analyzes the angular velocity original data and calculates to obtain the action velocity and the braking distance, and the upper computer is provided with a LabVIEW program. According to the LabVIEW-based falling test measuring system for the anti-falling safety device of the construction hoist, by adopting a LabVIEW graphical programming language, the LabVIEW-based falling test measuring system for the anti-falling safety device of the construction hoist is concise, visual, convenient to operate and simple and easy to understand in programming, has a powerful data processing function and shows extremely high efficiency; the device is directly installed on the direct output gear of the anti-falling safety device of the building hoist to be measured, the rotating speed of the gear of the anti-falling safety device is directly measured, the action speed and the braking distance are obtained through software calculation, measured data are comprehensive and accurate, and errors are small. The invention further discloses a method for measuring the falling test of the anti-falling safety device of the construction hoist based on the LabVIEW.

Description

Technical Field

[0001] The invention belongs to the technical field of construction hoist safety, and in particular relates to a LabVIEW-based fall test measurement system and method for a construction hoist anti-fall safety device. Background Art

[0002] As an indispensable vertical lifting construction equipment in high-rise building construction, the construction hoist has an anti-fall safety device to ensure the safety of the occupants, which is the most important anti-fall safety device for the cage. The working principle of the anti-fall safety device is mainly to use the difference in the falling speed of the object for self-control. When the cage running speed exceeds the rated speed, the centrifugal block overcomes the spring force and is thrown outward. The tip of the centrifugal block contacts the flange on the inner surface of the outer cone and drives the outer cone to rotate together. At this time, the copper nut moves axially and compresses the disc spring. Under the reaction force of the disc spring, the pressing force of the friction surface of the inner and outer cones gradually increases, and the braking torque also gradually increases until the cage stops running, thereby achieving the purpose of smooth braking.

[0003] GB / T 34025-2017 "Gear Progressive Anti-Fall Safety Device for Construction Hoists" 6.9 stipulates: In the following cases, the cage fall test should be carried out according to the following provisions using a remote control device, and the braking distance or average braking deceleration of the safety device during the test should comply with the regulations: a) When the elevator leaves the factory; b) When the elevator is installed on the construction site; c) Before the elevator is disassembled; d) When the replacement or re-inspected safety device is installed; e) From the date of installation of the safety device, the cage empty-load fall test should be carried out at least once every 3 months, and for passenger and cargo dual-purpose elevators, the cage should also be tested with a rated load at least once every 6 months. The most important thing in the performance parameter detection of the anti-fall safety device is the measurement of the braking distance and the action speed.

[0004] There are two testing methods for anti-fall safety devices: test bench test method and field test method. The test bench test method is to force the safety device to operate by accelerating the motor. The load applied to the safety device by the inertia of the flywheel device or the torque of the motor will be inconsistent with the actual working conditions, resulting in a large discrepancy between various test indicators (such as braking speed, braking distance, braking load, braking time) and the actual situation. Restricted by the test method, the test bench test method fails to take into account the influence of the braking impact coefficient, and it is difficult to determine the braking distance of the safety device that has been simulated for multiple consecutive times to achieve the braking force. The on-site test method mainly uses a vernier caliper to measure the displacement of the indicator pin (that is, the displacement of the butterfly spring), and then calculates the braking distance through the relevant calculation formula. This method is prone to human errors and cannot measure parameters such as the action speed of the anti-fall safety device, and cannot meet the needs of fall test detection.

[0005] It is desirable to provide an improved construction hoist anti-fall safety device fall test measurement system and method, particularly with regard to how to achieve accurate measurement of test parameters. Summary of the invention

[0006] 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 a fall test measurement system for a construction hoist anti-fall safety device, the purpose of which is to achieve accurate measurement of test parameters.

[0007] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a fall test measurement system for a construction elevator anti-fall safety device based on LabVIEW, including a host computer, a transmitter and a receiver, the host computer is connected to the receiver, the transmitter is installed on the direct output gear of the anti-fall safety device, the angular velocity raw data of the direct output gear of the anti-fall safety device is measured, and the angular velocity raw data is transmitted to the host computer through the receiver, the host computer parses the angular velocity raw data, and calculates the action speed and braking distance, and the host computer is installed with a LabVIEW program.

[0008] Preferably, the receiver is powered by a power supply, and the receiver is connected to the power supply.

[0009] Preferably, the power supply is a 12V mobile power supply.

[0010] Preferably, the transmitter communicates with the receiver using 2.4 GHz band radio waves.

[0011] Preferably, the transmitter is a wireless speed sensor, and the wireless speed sensor is powered by a button battery.

[0012] Preferably, the receiver is connected to the host computer via a USB to 485 converter.

[0013] The present invention also provides a LabVIEW-based fall test measurement method for a construction elevator anti-fall safety device, which adopts the measurement system and includes the steps of:

[0014] 1) The transmitter and the receiver perform device pairing and parameter configuration;

[0015] 2) Set the initialization parameters of the measurement system and the operating parameters and sampling period of the construction elevator anti-fall safety device;

[0016] 3) After the user clicks the mouse to start the measurement in the computer user interface, the user performs the drop test according to the equipment operation manual, and collects the original angular velocity data of the gear directly output by the safety fall arrester in real time according to the preset sampling period;

[0017] 4) Processing the raw angular velocity data in step 3), calculating the real-time running speed of the construction elevator according to the processing results, creating a speed array 1 in the LabVIEW program and displaying it in the form of an image;

[0018] 5) After the drop test is completed, the user clicks the mouse on the computer user interface to stop the measurement, processes the running speed described in step 4), and calculates the action speed and braking distance based on the processing results;

[0019] 6) Save the test data.

[0020] Preferably, the calculation formula in step 4) is:

[0021]

[0022] Among them, ν represents the operating speed of the construction elevator (unit: m / s); ω represents the angular velocity of the gear directly output by the safety device (unit: rad / s); mn represents the module of the gear directly output by the safety device (unit: mm); z represents the number of teeth of the gear directly output by the safety arrester.

[0023] Preferably, the speed array 1 obtained in step 5) is processed to screen the maximum value during the test, which is the action speed.

[0024] Preferably, the maximum value obtained by screening and its subsequent values ​​are combined into a new speed array 2, and the braking distance is calculated using the following formula:

[0025] L = ∫νdt

[0026] Wherein, L represents the braking distance, ν represents the speed value in the speed array 2, and dt represents the sampling period described in step 1).

[0027] The fall test measurement system of the construction elevator anti-fall safety device based on LabVIEW of the present invention has the following beneficial effects:

[0028] 1. By adopting LabVIEW graphical programming language, it is concise, intuitive, easy to run, easy to program, and has powerful data processing functions, which reflects extremely high efficiency;

[0029] 2. The present invention uses a wireless speed sensor, which is easy to install and has a wide range of uses, and is particularly suitable for measuring drop test parameters during use;

[0030] 3. The present invention can be remotely operated and viewed through the host computer, which greatly improves the convenience of operation;

[0031] 4. The present invention can be realized by only using a host computer, a transmitter, a receiver, and a power supply, and the cost is low;

[0032] 5. The present invention is directly installed on the direct output gear of the anti-fall safety device of the construction elevator to be tested, directly measures the rotation speed of the anti-fall safety device gear, and obtains the action speed and braking distance through software calculation. The measurement data is comprehensive and accurate with small error. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] This specification includes the following drawings, which show the following contents:

[0034] Figure 1 FIG. 4 is the front panel of the LabVIEW program in the embodiment.

[0035] Figure 2 It is a structural block diagram of the present invention in an embodiment.

[0036] Figure 3 Flowchart of the present invention in an embodiment.

[0037] Figure 4 It is a partial flowchart of the LabVIEW program in the embodiment. DETAILED DESCRIPTION

[0038] The specific implementation methods of the present invention are further explained in detail below by describing the embodiments with reference to the accompanying drawings, with the aim of helping those skilled in the art to have a more complete, accurate and in-depth understanding of the concept and technical solution of the present invention and facilitating its implementation.

[0039] First, as Figure 1 As shown, the present invention provides a fall test measurement system for a construction elevator anti-fall safety device based on LabVIEW, comprising a host computer, a transmitter and a receiver, wherein the host computer is connected to the receiver, the transmitter is installed on the direct output gear of the anti-fall safety device, measures the original angular velocity data of the direct output gear of the anti-fall safety device, and transmits the original angular velocity data to the host computer through the receiver, the host computer parses the original angular velocity data, and calculates the motion speed and braking distance, and the host computer is installed with a LabVIEW program.

[0040] Specifically, if Figure 1 As shown, the receiver is powered by a power supply, and the receiver is connected to the power supply. The transmitter uses 2.4 GHz band radio waves to communicate with the receiver.

[0041] In the embodiment of the present invention, the transmitter is a wireless speed sensor, and the wireless speed sensor is powered by a button battery.

[0042] In the embodiment of the present invention, the power source is a 12V mobile power source, and the host computer is a computer intelligent device with the LabVIEW program installed.

[0043] In the embodiment of the present invention, the receiver is connected to the host computer via a USB to 485 converter.

[0044] Second, as Figure 2As shown, the present invention also provides a fall test measurement method for a construction elevator anti-fall safety device based on LabVIEW, which adopts the above-mentioned measurement system and includes the following steps:

[0045] 1) The transmitter and receiver perform device pairing and configuration parameters;

[0046] 2) Set the initialization parameters of the measurement system and the operating parameters and sampling period of the construction elevator anti-fall safety device;

[0047] 3) After the user clicks the mouse to start the measurement in the computer user interface, the user performs the drop test according to the equipment operation manual, and collects the original angular velocity data of the gear directly output by the safety fall arrester in real time according to the preset sampling period;

[0048] 4) Process the raw angular velocity data of step 3), calculate the real-time running speed of the construction elevator according to the processing results, create a speed array 1 in the LabVIEW program and display it in the form of an image, for example, Figure 3 The user interface shown is presented in the VT curve graph;

[0049] 5) After the drop test is completed, the user clicks the mouse on the computer user interface to stop the measurement, processes the running speed of step 4), and calculates the action speed and braking distance based on the processing results. The partial program block diagram of LabVIEW is shown below. Figure 4 As shown;

[0050] 6) Save the test data.

[0051] The calculation formula in step 4) is:

[0052]

[0053] Among them, ν represents the operating speed of the construction elevator (unit: m / s); ω represents the angular velocity of the gear directly output by the safety device (unit: rad / s); mn represents the module of the gear directly output by the safety device (unit: mm); z represents the number of teeth of the gear directly output by the safety arrester.

[0054] The speed array 1 obtained in step 5) is processed to select the maximum value during the test, which is the action speed.

[0055] The maximum value obtained by screening and its subsequent values ​​are combined into a new speed array 2, and the braking distance is calculated. The calculation formula is:

[0056] L = ∫νdt

[0057] Wherein, L represents the braking distance, ν represents the speed value in speed array 2, and dt represents the sampling period of step 1).

[0058] The embodiment of the present invention provides a fall test measurement system and method for a construction elevator anti-fall safety device based on LabVIEW. By adopting the LabVIEW graphical programming language, it is concise, intuitive, easy to run, easy to understand, and has powerful data processing functions, which reflects extremely high efficiency. Remote operation and viewing can be performed through a host computer, which greatly improves the convenience of operation. The use of a wireless speed sensor is simple and convenient to install and has a wide range of uses. It is particularly suitable for measuring fall test parameters during use. The speed sensor is directly installed on the direct output gear of the anti-fall safety device of the construction elevator to be tested, directly measures the rotation speed of the gear of the anti-fall safety device, and calculates the action speed and braking distance through software. The measurement data is comprehensive and accurate, and the error is small. The measurement process only needs to be realized through a host computer, a transmitter, a receiver, and a power supply, and the cost is low.

[0059] The present invention is described above by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention; or the above concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. The fall test measurement system of the construction hoist anti-fall safety device based on LabVIEW is characterized by: The invention comprises a host computer, a transmitter and a receiver. The host computer is connected with the receiver. The transmitter is installed on the direct output gear of the anti-fall safety device. The original angular velocity data of the direct output gear of the anti-fall safety device is measured, and the original angular velocity data is transmitted to the host computer through the receiver. The host computer analyzes the original angular velocity data and calculates the motion speed and braking distance. The host computer is installed with a LabVIEW program.

2. The LabVIEW-based construction elevator anti-fall safety device fall test measurement system according to claim 1, characterized in that: The receiver is powered by a power supply, and the receiver is connected to the power supply.

3. The fall test measurement system for construction hoist anti-fall safety device based on LabVIEW according to claim 2 is characterized in that: The power source is a 12V mobile power source.

4. The LabVIEW-based construction elevator anti-fall safety device fall test measurement system according to any one of claims 1 to 3, characterized in that: The transmitter communicates with the receiver using 2.4 GHz band radio waves.

5. The LabVIEW-based construction elevator anti-fall safety device fall test measurement system according to any one of claims 1 to 3, characterized in that: The transmitter is a wireless speed sensor, which is powered by a button battery.

6. The LabVIEW-based fall test measurement system for construction hoist anti-fall safety device according to any one of claims 1 to 3, characterized in that: The receiver is connected to the host computer via a USB to 485 converter.

7. The fall test measurement method of the construction hoist anti-fall safety device based on LabVIEW is characterized by: A measuring system according to any one of claims 1 to 6 is used, and comprises the steps of: 1) The transmitter and the receiver perform device pairing and parameter configuration; 2) Set the initialization parameters of the measurement system and the operating parameters and sampling period of the construction elevator anti-fall safety device; 3) After the user clicks the mouse to start the measurement in the computer user interface, the user performs the drop test according to the equipment operation manual, and collects the original angular velocity data of the gear directly output by the safety fall arrester in real time according to the preset sampling period; 4) Processing the raw angular velocity data in step 3), calculating the real-time running speed of the construction elevator according to the processing results, creating a speed array 1 in the LabVIEW program and displaying it in the form of an image; 5) After the drop test is completed, the user clicks the mouse on the computer user interface to stop the measurement, processes the running speed described in step 4), and calculates the action speed and braking distance based on the processing results; 6) Save the test data.

8. The fall test measurement method of the construction hoist anti-fall safety device based on LabVIEW according to claim 7 is characterized in that: The calculation formula in step 4) is: Among them, ν represents the operating speed of the construction elevator (unit: m / s); ω represents the angular velocity of the gear directly output by the safety device (unit: rad / s); mn represents the module of the gear directly output by the safety device (unit: mm); z represents the number of teeth of the gear directly output by the safety arrester.

9. The fall test measurement method of the construction hoist anti-fall safety device based on LabVIEW according to claim 7 is characterized in that: The speed array 1 obtained in step 5) is processed to select the maximum value during the test, which is the action speed.

10. The fall test measurement method of the construction hoist anti-fall safety device based on LabVIEW according to claim 7 is characterized in that: The maximum value obtained by screening and its subsequent values ​​are combined into a new speed array 2, and the braking distance is calculated. The calculation formula is: L = ∫νdt Wherein, L represents the braking distance, ν represents the speed value in the speed array 2, and dt represents the sampling period described in step 1).

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