CN110857883A - Calibration method for travelling crane weighing system - Google Patents
Calibration method for travelling crane weighing system Download PDFInfo
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- CN110857883A CN110857883A CN201810959214.XA CN201810959214A CN110857883A CN 110857883 A CN110857883 A CN 110857883A CN 201810959214 A CN201810959214 A CN 201810959214A CN 110857883 A CN110857883 A CN 110857883A
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- travelling crane
- weight
- weighing system
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G23/00—Auxiliary devices for weighing apparatus
- G01G23/01—Testing or calibrating of weighing apparatus
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- General Physics & Mathematics (AREA)
- Control And Safety Of Cranes (AREA)
Abstract
The invention relates to a calibration method of a travelling crane weighing system, which comprises the steps of returning to 0, weighing at an initial position, weighing at a check position, compensating weight and the like. The calibration method for the travelling crane weighing system provided by the invention realizes automatic calibration of the travelling crane weighing system by utilizing the characteristic that the weight variation of the steel wire rope used by the lifting hook of the travelling crane has a linear relation with the height, has the advantages of simple and easy calibration method, high speed and high efficiency, does not influence production, can timely find the abnormity of the weighing system, timely intervenes and adjusts manually, and ensures the precision of the weighing system.
Description
Technical Field
The invention relates to a calibration method of a travelling crane weighing system, and belongs to the technical field of steel manufacturing.
Background
A plurality of traveling cranes are arranged in a factory building of a steel casting plant, weighing sensors are arranged on main coil fixed pulley blocks of the traveling cranes to weigh the weight of a main coil, and the weight of the main coil is calculated to calculate the single-furnace iron adding amount and the single-furnace steel tapping amount (the weight of a full ladle of molten iron before iron adding minus the weight of a empty ladle after iron adding, namely the single-furnace iron adding amount, and the weight of the full ladle of molten iron after tapping minus the weight of the empty ladle before tapping, namely the single-furnace steel tapping amount), so that important parameter bases are provided for converter and continuous casting model steel making.
The accuracy of the weighing system is very important for model steel making, and the proportion of various auxiliary raw materials and the proportion of alloy are calculated accordingly, so that the accuracy of the weighing system is very critical to guarantee. The weighing range of the travelling crane is large (for example, the maximum range used by me department is 420 tons), so the calibration engineering quantity by weights is huge, the production time is influenced, the calibration process is not less than 8 hours once, the travelling cranes are all mainline travelling cranes, the rhythm is tight, the parking and maintenance time in one year is very little, the maintenance task quantity is large during maintenance, and the calibration can be coordinated only when the weighing deviation of the travelling crane is very obvious. At ordinary times, management means is limited, and only two traveling cranes with the same span can hoist the same iron ladle respectively, so that the weighing accuracy of the traveling cranes is compared by observing the consistency of data, the production rhythm is influenced, and the situation is passive.
Disclosure of Invention
The invention aims to solve the technical problems that: the defects of the technology are overcome, and the calibration method of the traveling crane weighing system, which does not need to be stopped for maintenance and does not influence the production rhythm, is provided.
In order to solve the technical problems, the technical scheme provided by the invention is as follows: a calibration method for a travelling crane weighing system comprises the following steps:
(1) when the travelling crane is empty, lifting the travelling crane hook to an upper limit position, after the travelling crane hook is stabilized, reading an initial weight value, and taking the initial weight value as a weight value zero point;
(2) when the travelling crane carries out the hoisting operation, lifting a lifting hook of the travelling crane to the upper limit position, and reading a first weight value after the lifting hook is stabilized; then lowering the lifting hook of the travelling crane to a first position, and reading a second weight value after the travelling crane is stabilized; obtaining a difference value between the upper limit position and the first position to obtain a first length, and obtaining a first weight difference by taking a difference value between the second weight value and the first weight value;
(3) obtaining the weight of the steel wire rope in unit length according to the specification of the steel wire rope used by the lifting hook of the travelling crane; calculating to obtain a standard weight by combining the first length;
(4) dividing the first weight difference by the standard weight to obtain a weighing system error value;
(5) and dividing the first weight value by the error value of the weighing system to obtain the corrected weight of the load hung by the travelling crane.
The scheme is further improved in that: the waiting stabilization time of the step (1) and the step (2) is more than or equal to 30 seconds.
The calibration method for the travelling crane weighing system provided by the invention realizes automatic calibration of the travelling crane weighing system by utilizing the characteristic that the weight variation of the steel wire rope used by the lifting hook of the travelling crane has a linear relation with the height, has the advantages of simple and easy calibration method, high speed and high efficiency, does not influence production, can timely find the abnormity of the weighing system, timely intervenes and adjusts manually, and ensures the precision of the weighing system.
Detailed Description
Examples
The calibration method of the travelling crane weighing system in the embodiment comprises the following steps according to the travelling crane characteristics of the existing casting shop:
(1) when the travelling crane is empty, lifting the travelling crane hook to an upper limit position, after the travelling crane hook is stabilized, reading an initial weight value, and taking the initial weight value as a weight value zero point; i.e., a conventional "return to 0" operation; removing the influence of the current self-weight and the like;
(2) when the travelling crane carries out the hoisting operation, lifting a lifting hook of the travelling crane to the upper limit position, and reading a first weight value after the lifting hook is stabilized, wherein the first weight value is 400 tons in the embodiment; then, lowering the hook of the travelling crane to a first position, and after the crane is stabilized, reading a second weight value, wherein the second weight value is 402 tons in the embodiment; obtaining a difference value between the upper limit position and the first position to obtain a first length, and obtaining a first weight difference by taking a difference value between the second weight value and the first weight value;
(3) obtaining the weight of the steel wire rope in unit length according to the specification of the steel wire rope used by the lifting hook of the travelling crane; calculating to obtain a standard weight by combining the first length, wherein the standard weight is 2.05 tons in the embodiment;
(4) dividing the first weight difference by the standard weight to obtain a weighing system error value;
(5) dividing the first weight value by the error value of the weighing system to obtain the weight of the suspended load of the traveling crane after calibration, namely 400 x (2.05/(402-) =410 tons.
Wherein, the waiting stabilization time of the step (1) and the step (2) is summarized according to the experience of the production process and should be more than or equal to 30 seconds.
The first length in this embodiment can be obtained by installing an absolute value encoder on the traveling crane reel, and outputting data of the encoder to the PLC of the traveling crane. And converting the output value of the encoder in the PLC, thereby obtaining the height change data of the lifting hook of the travelling crane.
If the weighing host of the traveling crane has the steel wire rope compensation function, the function is forbidden in the weighing host, and the automatic zero clearing function of the weighing host is forbidden at the same time.
Besides weight calibration, the weighing system of the travelling crane can be verified. If the error value of the weighing system is between 0.995 and 1.005, the accuracy of the weighing system is proved to meet the requirement, and if the error value exceeds the range, the error of the weighing system is indicated to be too large, and shutdown maintenance and calibration are required.
If the steel wire rope is replaced, the weight of the steel wire rope in unit length can be redefined in the interruption (3).
The present invention is not limited to the above-described embodiments. All technical solutions formed by equivalent substitutions fall within the protection scope of the claims of the present invention.
Claims (2)
1. A calibration method for a travelling crane weighing system is characterized by comprising the following steps:
(1) when the travelling crane is empty, lifting the travelling crane hook to an upper limit position, after the travelling crane hook is stabilized, reading an initial weight value, and taking the initial weight value as a weight value zero point;
(2) when the travelling crane carries out the hoisting operation, lifting a lifting hook of the travelling crane to the upper limit position, and reading a first weight value after the lifting hook is stabilized; then lowering the lifting hook of the travelling crane to a first position, and reading a second weight value after the travelling crane is stabilized; obtaining a difference value between the upper limit position and the first position to obtain a first length, and obtaining a first weight difference by taking a difference value between the second weight value and the first weight value;
(3) obtaining the weight of the steel wire rope in unit length according to the specification of the steel wire rope used by the lifting hook of the travelling crane; calculating to obtain a standard weight by combining the first length;
(4) dividing the first weight difference by the standard weight to obtain a weighing system error value;
(5) and dividing the first weight value by the error value of the weighing system to obtain the corrected weight of the load hung by the travelling crane.
2. A method for calibrating a vehicle weighing system according to claim 1, wherein: the waiting stabilization time of the step (1) and the step (2) is more than or equal to 30 seconds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810959214.XA CN110857883B (en) | 2018-08-22 | 2018-08-22 | Calibration method for travelling crane weighing system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810959214.XA CN110857883B (en) | 2018-08-22 | 2018-08-22 | Calibration method for travelling crane weighing system |
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| CN110857883A true CN110857883A (en) | 2020-03-03 |
| CN110857883B CN110857883B (en) | 2021-08-13 |
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| CN110857883B (en) | 2021-08-13 |
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