In-situ measuring device for weight of elevator car

Abstract

The invention discloses an elevator car weight in-situ measurement device which comprises a calculation module, a data acquisition and control module, a data management and analysis module and a visualization and interaction module. The calculation module is used for constructing a car weight in-situ measurement calculation model and outputting the weight of the elevator car through the change of voltage, current and power; the data acquisition and control module is used for acquiring three-phase current and three-phase voltage, measuring power through an electric quantity module, measuring the speed and the running distance of an elevator by adopting an encoder type consistent with that of a driving host, and displaying the sampling time difference through a single chip microcomputer and an internal timer; the data management and analysis module is used for storing test data, comparing the test data with lift car weight delivery data and analyzing whether the lift car is overweight or not based on a statistical model. According to the method, the weight of the lift car and the weight of the counterweight are accurately calculated according to the final weight of the lift car and the counterweight and the maximum traction force formula derivation, and manual intervention is not needed.

Description

Technical Field

[0001] The present invention relates to the technical field of elevator cars, in particular to an in-situ weight measuring device for an elevator car. Background Art

[0002] Since the elevator car needs to be installed on site, the final car weight and counterweight weight are difficult to measure again. Traditional wire rope tension conversion requires individual measurement of each wire rope on the upper part of the car. The results vary greatly depending on the position and height of the sensor, and the numerical accuracy and stability are insufficient. Summary of the Invention

[0003] The object of the present invention is to provide an elevator car weight in-situ measuring device to solve the problems in the prior art.

[0004] To achieve the above-mentioned object, the present invention provides the following technical solutions: an elevator car weight in-situ measurement device, comprising a calculation module, a data acquisition and control module, a data management and analysis module, and a visualization and interaction module;

[0005] The calculation module is used to construct an in-situ measurement calculation model for the car weight, and output the elevator car weight through changes in voltage, current, and power;

[0006] The data acquisition and control module is used to collect three-phase current and three-phase voltage, measure power through the power module, use the same encoder type as the drive host to measure the elevator speed and running distance, and display the sampling time difference through the single-chip microcomputer and internal timer;

[0007] The data management and analysis module is used to store test data, compare it with the factory weight data of the car, and analyze whether the car is overweight based on the statistical model;

[0008] The visualization and interaction module is used to directly display the car weight and generate detection reports and warning information.

[0009] Preferably, the data acquisition and control module includes three current transformers for collecting three-phase current; the data acquisition and control module also includes a voltage test line for collecting three-phase voltage.

[0010] Preferably, the encoder type in the data acquisition and control module adopts a speed test wheel and a magnetic table base, the magnetic table base is adsorbed on a solid metal plane near the hanging wire rope or the speed limiter rope, and the speed measuring roller of the speed test wheel is close to the wire rope or the speed limiter rope.

[0011] Preferably, the formula of the calculation module is:

[0012] m 差 =K*Q

[0013] m 和 =(P1+P0-K*Qg(V1-V0)t) / (V1-V0) 2 t

[0014] P0 is the last power in watts (W)

[0015] P1 is the current power in watts (W)

[0016] m 和 is the sum of the weight of the car and counterweight, in kilograms

[0017] m 差 The weight difference between the car and the counterweight, in kilograms

[0018] V0 is the last speed value, in meters per second (m / s)

[0019] V1 is the current speed value, in meters per second (m / s)

[0020] t is the time difference between the last sampling and the current sampling, in seconds (s)

[0021] g is the acceleration due to gravity, which is 9.81 m / s 2

[0022] K is the elevator balance coefficient.

[0023] Preferably, it also includes a Bluetooth module, which is used to realize wireless transmission of data.

[0024] Preferably, the visualization and interaction module includes a human-computer interaction touch screen for inputting parameters, displaying data and inputting operation instructions.

[0025] Preferably, it also includes a power battery and a charger matched with the power battery, and the power battery provides power support for the device.

[0026] An elevator car weight in-situ measurement method, using the elevator car weight in-situ measurement device, comprises the following steps:

[0027] S1. Disconnect the elevator main switch and place the elevator balance coefficient tester to ensure the main unit is stable;

[0028] S2. Install the speed sensor and attach the magnetic base to the corresponding position so that the speed measuring roller is close to the wire rope or speed limiter rope;

[0029] S3. Connect the voltage test wire and the clamp-type current clamp. Clamp the voltage test wire to the three-phase input terminal of the traction machine or the three-phase output terminal of the control cabinet to the traction machine. Put the current clamp on the wires of the three-phase input terminal of the traction machine according to the color.

[0030] S4. Insert the voltage test wire, current clamp and speed sensor plugs into the corresponding interfaces of the host respectively;

[0031] S5. Check all connections. After confirming that they are correct, turn on the elevator main switch and start the instrument preheating;

[0032] S6. Input parameters, including traction ratio and rated load;

[0033] S7, no-load running test, make the elevator complete a continuous round trip between the two terminal stations;

[0034] S8, obtaining a balance coefficient test value;

[0035] S9. The instrument automatically calculates and outputs the car weight and counterweight weight based on the collected data and formula.

[0036] Preferably, if a speed sensor is used to test the speed limiter rope for speed measurement in S6, the traction ratio is set to 1:1.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] 1. Dynamic testing is used. After the elevator is installed, data is collected and analyzed using voltage, current, power, and speed modules. The final weight of the car and counterweight is deduced from the maximum traction force formula to accurately calculate the car and counterweight weights. No human intervention is required from start to finish, greatly reducing the impact of human factors. This application can help elevator users promptly identify safety hazards, ensure safe elevator operation, and support the improvement of elevator performance.

[0039] 2. The data acquisition and control module collects three currents and three-phase voltages to ensure measurement accuracy and stability, and measures power through the power module. It uses the same encoder type as the drive host to measure the elevator speed and running distance, which is convenient and efficient. It will not interfere with the elevator operation and can synchronize with the elevator controller to compare the accuracy of the data. The sampling time difference is accurately displayed through the single-chip microcomputer and the internal timer, and the high sampling frequency ensures the reliability of sampling. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0041] Figure 1 It is a schematic diagram of the present invention. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention.

[0043] See also Figure 1 ,In an embodiment of the present invention, an elevator car weight in-situ ,measurement device includes a calculation module, a data acquisition and control module, a data management and ,analysis module, and a visualization and interaction module;

[0044] The calculation module is used to construct an in-situ measurement calculation model for the car weight, and output the elevator car weight through changes in voltage, current, and power;

[0045] The data acquisition and control module is used to collect three-phase current and three-phase voltage, measure power through the power module, use the same encoder type as the drive host to measure the elevator speed and running distance, and display the sampling time difference through the single-chip microcomputer and internal timer;

[0046] The data management and analysis module is used to store test data, compare it with the factory weight data of the car, and analyze whether the car is overweight based on the statistical model;

[0047] The visualization and interaction module is used to directly display the car weight and generate detection reports and warning information.

[0048] Preferably, the data acquisition and control module includes three current transformers for collecting three-phase current; the data acquisition and control module also includes a voltage test line for collecting three-phase voltage.

[0049] Preferably, the encoder type in the data acquisition and control module adopts a speed test wheel and a magnetic table base, the magnetic table base is adsorbed on a solid metal plane near the hanging wire rope or the speed limiter rope, and the speed measuring roller of the speed test wheel is close to the wire rope or the speed limiter rope.

[0050] Formula derivation process:

[0051] Kinetic energy formula:

[0052] Potential energy formula: Ep=m 差 gh

[0053] Work formula: W = P * t

[0054] Energy formula for the acceleration process:

[0055] Work = Kinetic Energy + Potential Energy: W = E K +Ep

[0056] The middle section of acceleration and deceleration is uniform acceleration operation:

[0057]

[0058] P1+P0=m 和 a 2 t+m 差 gat

[0059] P1+P0=m 和 (V1-V0) 2 t+m 差 g(V1-V0)t

[0060] m 差 =K*Q

[0061] m 和 =(P1+P0-K*Qg(V1-V0)t) / (V1-V0) 2 t

[0062] P0 is the last power in watts (W)

[0063] P1 is the current power in watts (W)

[0064] m 和 is the sum of the weight of the car and counterweight, in kilograms

[0065] m 差 The weight difference between the car and the counterweight, in kilograms

[0066] V0 is the last speed value, in meters per second (m / s)

[0067] V1 is the current speed value, in meters per second (m / s)

[0068] t is the time difference between the last sampling and the current sampling, in seconds (s)

[0069] g is the acceleration due to gravity, which is 9.81 m / s 2

[0070] K is the elevator balance coefficient.

[0071] Preferably, it also includes a Bluetooth module, which is used to realize wireless transmission of data.

[0072] Preferably, the visualization and interaction module includes a human-computer interaction touch screen for inputting parameters, displaying data and inputting operation instructions.

[0073] Preferably, it also includes a power battery and a charger matched with the power battery, and the power battery provides power support for the device.

[0074] An elevator car weight in-situ measurement method, using the elevator car weight in-situ measurement device, comprises the following steps:

[0075] S1. Disconnect the elevator main switch and place the elevator balance coefficient tester to ensure the main unit is stable;

[0076] S2. Install the speed sensor and attach the magnetic base to the corresponding position so that the speed measuring roller is close to the wire rope or speed limiter rope;

[0077] S3. Connect the voltage test wire and the clamp-type current clamp. Clamp the voltage test wire to the three-phase input terminal of the traction machine or the three-phase output terminal of the control cabinet to the traction machine. Put the current clamp on the wires of the three-phase input terminal of the traction machine according to the color.

[0078] S4. Insert the voltage test wire, current clamp and speed sensor plugs into the corresponding interfaces of the host respectively;

[0079] S5. Check all connections. After confirming that they are correct, turn on the elevator main switch and start the instrument preheating;

[0080] S6. Input parameters, including traction ratio and rated load;

[0081] S7, no-load running test, make the elevator complete a continuous round trip between the two terminal stations;

[0082] S8, obtaining a balance coefficient test value;

[0083] S9. The instrument automatically calculates and outputs the car weight and counterweight weight based on the collected data and formula.

[0084] Preferably, if a speed sensor is used to test the speed limiter rope for speed measurement in S6, the traction ratio is set to 1:1.

[0085] Installation Preparation: Disconnect the elevator main switch, ensure the instrument is turned off, and confirm that the on-site environment meets the test requirements. Place the elevator balance coefficient tester near the drive unit to ensure that the unit is stable and there is no risk of falling, sliding, or overturning.

[0086] Install the speed sensor: When the elevator is stopped, securely attach the magnetic base to a solid metal surface near the hanging wire rope or speed governor rope. Adjust the angle so that the spring on the magnetic base can pull the speed measuring roller of the speed sensor tightly against the wire rope or speed governor rope through tension to prevent it from slipping or deviating during the elevator operation test.

[0087] Connect the voltage test lead and the clamp-on current clamp:

[0088] Clip the wire clips of three voltage test wires (model UE, red, yellow, and green) to the three-phase input terminal of the traction machine or the three-phase output terminal of the control cabinet to the traction machine in sequence, making sure that the colors correspond;

[0089] Put three clamp-type current clamps (model CT, red, yellow, and green) on the wires of the three-phase input terminal of the traction machine according to their colors. The current direction must be consistent with the marking on the clamp body (from the control cabinet to the traction machine).

[0090] Connect the instrument interface: Insert the voltage test line, current clamp and speed sensor plugs into the corresponding interfaces of the host (voltage test socket, current clamp socket, speed test socket) respectively.

[0091] Inspection and start-up: Check all connections to ensure they are away from the elevator's moving parts and operating parts; after confirming that the installation is correct, turn on the elevator's main switch, start the instrument to preheat, and prepare for testing.

[0092] Input parameters: The parameters that need to be input include (such as traction ratio, rated load, etc.), which can be directly entered according to the screen content. Click the input bar to display the numeric keyboard.

[0093] No-load running test: Click "Start" to start the test function of the tester. After starting the test, the elevator should complete a continuous round trip between the two terminals, that is, it should drive directly from one terminal to another terminal, stop, and then drive directly back to the original terminal.

[0094] Obtaining the balance coefficient test value: After the elevator stops, click "Calculate" to obtain the balance coefficient test value. You can also click the "Calculate" button immediately after clicking the "Start" button. The instrument will automatically calculate the balance coefficient each time the elevator stops and display the most recently calculated balance coefficient value.

[0095] Determine the weight of the car: The instrument will automatically calculate the weight of the car and counterweight (m according to the collected data such as power (P0, P1), speed (V0, V1), time difference (t) and balance coefficient value, combined with the formula 和 ), weight difference (m 差 ), and finally output the car weight and counterweight weight.

[0096] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An elevator car weight in-situ measuring device, characterized in that: It includes calculation module, data acquisition and control module, data management and analysis module, and visualization and interaction module; The calculation module is used to construct an in-situ measurement calculation model for the car weight, and output the elevator car weight through changes in voltage, current, and power; The data acquisition and control module is used to collect three-phase current and three-phase voltage, measure power through the power module, use the same encoder type as the drive host to measure the elevator speed and running distance, and display the sampling time difference through the single-chip microcomputer and internal timer; The data management and analysis module is used to store test data, compare it with the factory weight data of the car, and analyze whether the car is overweight based on the statistical model; The visualization and interaction module is used to directly display the car weight and generate detection reports and warning information.

2. The elevator car weight in-situ measuring device according to claim 1, characterized in that: The data acquisition and control module includes three current transformers for collecting three-phase current; the data acquisition and control module also includes a voltage test line for collecting three-phase voltage.

3. The in-situ measurement device for elevator car weight according to claim 1, characterized in that: The encoder type in the data acquisition and control module adopts a speed test wheel and a magnetic meter base. The magnetic meter base is adsorbed on a solid metal plane near the hanging wire rope or the speed limiter rope, and the speed measuring roller of the speed test wheel is close to the wire rope or the speed limiter rope.

4. The in-situ measurement device for elevator car weight according to claim 1, characterized in that: The formula of the calculation module is: m 差 =K*Q m 和 =(P1+P0-K*Qg(V1-V0)t) / (V1-V0) 2 t P0 is the last power in watts (W) P1 is the current power in watts (W) m 和 is the sum of the weight of the car and counterweight, in kilograms m 差 The weight difference between the car and the counterweight, in kilograms V0 is the last speed value, in meters per second (m / s) V1 is the current speed value, in meters per second (m / s) t is the time difference between the last sampling and the current sampling, in seconds (s) g is the acceleration due to gravity, which is 9.81 m / s 2 K is the elevator balance coefficient.

5. The in-situ measurement device for elevator car weight according to claim 1, characterized in that: It also includes a Bluetooth module, which is used to realize wireless transmission of data.

6. The in-situ measurement device for elevator car weight according to claim 1, characterized in that: The visualization and interaction module includes a human-computer interaction touch screen for inputting parameters, displaying data and inputting operation instructions.

7. The in-situ measurement device for elevator car weight according to claim 1, characterized in that: Also included is a power battery and a charger matched with the power battery, wherein the power battery provides power support for the device.

8. A method for in-situ measurement of elevator car weight, characterized in that: An elevator car weight in-situ measurement device according to any one of claims 1 to 7 is used, comprising the following steps: S1. Disconnect the elevator main switch and place the elevator balance coefficient tester to ensure the main unit is stable; S2. Install the speed sensor and attach the magnetic base to the corresponding position so that the speed measuring roller is close to the wire rope or speed limiter rope; S3. Connect the voltage test wire and the clamp-type current clamp. Clamp the voltage test wire to the three-phase input terminal of the traction machine or the three-phase output terminal of the control cabinet to the traction machine. Put the current clamp on the wires of the three-phase input terminal of the traction machine according to the color. S4. Insert the voltage test wire, current clamp and speed sensor plugs into the corresponding interfaces of the host respectively; S5. Check all connections. After confirming that they are correct, turn on the elevator main switch and start the instrument preheating; S6. Input parameters, including traction ratio and rated load; S7, no-load running test, make the elevator complete a continuous round trip between the two terminal stations; S8, obtaining a balance coefficient test value; S9. The instrument automatically calculates and outputs the car weight and counterweight weight based on the collected data and formula.

9. The in-situ measurement method for elevator car weight according to claim 8, characterized in that: If the speed sensor is used to test the speed governor rope for speed measurement in S6, the traction ratio is set to 1:1.

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