Crane load identification, measurement and adjustment control method

A technology of load identification and control method, applied in cranes, load hanging components, safety devices, etc., can solve the problems of cumbersome installation, accidents, and low accuracy of load mass measurement, so as to avoid safety accidents and avoid errors. , Reduce the effect of starting fuel consumption

Pending Publication Date: 2018-11-06
SICHUAN PANGYUAN MACHINERY ENG CO LTD
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0004] The problem with this method is that in practical applications, the selection of the power take-off point will be limited by the structure of the crane, which will affect the measurement accuracy and stability of the overload protection device. At the same time, the installation of the force take-off sensor needs to change the inherent mechanical structure of the crane. The installation process is complicated, and the mechanical wear of the elastic body will lead to a decrease in accuracy;
[0006] The problem with this method is: due to many factors affecting the working current of the motor, the actual working current cannot accurately reflect the load quality, resulting in unscientific measurement principles, low accuracy of load quality measurement, and excessive response time causing safety problems. Hidden dangers and the cumbersome installation ca

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  • Crane load identification, measurement and adjustment control method
  • Crane load identification, measurement and adjustment control method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0102] like figure 1 As shown, a control method for crane load identification, measurement and adjustment includes the following steps:

[0103] a. Obtain the load data of the crane, obtain the magnification of the wire rope, and obtain the pressure value and flow value at the outlet of the crane oil pump;

[0104] b. According to the obtained crane load data, calculate the load quality of the crane;

[0105] c. Determine whether the load quality exceeds the preset load limit, if yes, go to step d; if not, the crane can work normally;

[0106] d. Calculate the first load parameter and the second load parameter of the crane according to the wire rope magnification; calculate the load torque demand according to the pressure value and flow value;

[0107] e. According to the load quality, wire rope magnification and load torque requirements, perform torque control operations and collect the value of the strain signal ε;

[0108] f. Perform safety protection operations accordin...

Embodiment 2

[0111] In this embodiment, on the basis of Embodiment 1, the steps of obtaining the load data of the crane in the step a are as follows:

[0112] Measure the three-phase voltage, three-phase current and their relationship of the hoisting motor when the crane is loaded upwards, and obtain the electric energy P input by the system when the crane is loaded e and stator current i 1 ;

[0113] Obtain the electric energy P input when the crane is unloaded e (0) and stator current i 1 (0);

[0114] Obtain the ascent velocity V of the crane when it is unloaded 0 , The stator resistance R of the lifting motor 1 and acceleration a at startup.

[0115] This embodiment is used to collect relevant parameters of the crane load data, and the collected data is comprehensive and effective, thereby making the calculation of the load data more accurate.

Embodiment 3

[0117] In this embodiment, on the basis of Embodiment 2, the step of calculating the load quality of the crane in the step b includes:

[0118] m=[P e -P e (0)-3×(i 1 2 -i 1 (0) 2 )×R 1 ] / [g+a]V 0

[0119] When the acceleration a when the crane starts is much smaller than the gravitational acceleration g, set a=0, and the load mass of the crane at this time m=[P e -P e (0)-3×(i 1 2 -i 1 (0) 2 )×R 1 ] / gV 0 ;in:

[0120] P e is the electric energy input by the system when the crane is loaded; P e (0) is the electric energy input when the crane is unloaded; i 1 Stator current when the crane is loaded; i 1 (0) is the stator current when the crane is no-load; R 1 is the stator resistance of the hoisting motor of the crane; V 0 is the lifting speed of the crane when it is unloaded; g is the acceleration due to gravity; a is the acceleration when the crane starts.

[0121] The load mass of the crane can be calculated through this algorithm, which improves the me...

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Abstract

The invention discloses a crane load identification, measurement and adjustment control method. The control method comprises the steps that load data of the crane are acquired, a load mass of the crane is calculated, if the load mass exceeds a preset load limit, a steel wire rope multiple is obtained, and a first load parameter and a second load parameter of the crane are calculated; a pressure value and a flow value of an outlet of the crane oil pump are acquired, and a load torque requirement is calculated; and torque control operation is executed according to the load mass, the steel wire rope multiple and the load torque requirement, and safety protection operation is executed according to the acquired magnitude of a strain signal epsilon value. According to the control method, the dynamic and static combined measurement is realized, so that the measurement data are more comprehensive, the precision is higher, corresponding safety protection measures can be made for different situations, major accidents are avoided, the control is simple, and the application range is wide.

Description

technical field [0001] The invention relates to the field of cranes, in particular to a control method for crane load identification, measurement and adjustment. Background technique [0002] Traditional methods of identifying, measuring and adjusting crane loads mainly use the following two measurement functions: [0003] (1) The method of installing a force sensor is adopted. The working principle is: the mechanical deformation of the elastic body caused by the load causes the resistance value of the strain gauge fixed in the elastic body to change, and the resistance value of the strain gauge and the load mass are used. The functional relationship is used to measure the load quality; [0004] The problem with this method is that in practical applications, the selection of the power take-off point will be limited by the structure of the crane, which will affect the measurement accuracy and stability of the overload protection device. At the same time, the installation of ...

Claims

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Application Information

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IPC IPC(8): B66C13/16B66C15/00
CPCB66C13/16B66C15/00B66C2700/084
Inventor 李青林攀杨朝星杨成
Owner SICHUAN PANGYUAN MACHINERY ENG CO LTD
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