A method for distinguishing the difference in the number of steel bars in a bundle

Abstract

The present invention discloses a method for distinguishing the difference in the number of steel bars in a bundle, belonging to the technical field of steel packaging, and solving the technical problem of inaccurate bundling quantity in the packaging of section steel rolled by section steel mills. The method comprises the following steps: Step 1. During continuous production, accurately verify that the number of steel bars in the first bundle is correct; obtain the weight of the first bundle of steel bars through a weighing system, and use the weight of the first bundle of steel bars as the reference weight; Step 2. Obtain the weight of the current bundle of steel bars through the weighing system; Step 3. Compare the weight of the current bundle of steel bars with the reference weight to obtain a weight difference; Step 4. If the weight difference is greater than or equal to the theoretical weight of a single steel bar, it can be preliminarily determined that the number of steel bars in the current bundle is deviated and needs to be rechecked and rectified; otherwise, use the weight of the current bundle of steel bars as the reference weight; Step 5. Repeat Steps 2 to 4. The present invention only needs to accurately verify that the number of steel bars in the first bundle is correct, and can effectively avoid verifying the number of steel bars in each bundle during continuous rolling production.

Description

Technical Field

[0001] The present invention relates to the technical field of steel packaging, and more specifically, it relates to a method for distinguishing the difference in the number of steel bars in a bundle. Background Art

[0002] GB / T 2101-2017 stipulates that "square steel, steel bars, steel reinforcement bars, hexagonal steel, octagonal steel and other small-sized sections with a size less than or equal to 90 mm, equal-angle steel with a side width less than 200 mm, unequal-angle steel with a side width less than 200 mm × 125 mm, flat steel with a width less than 150 mm, and other sections with a weight per meter not greater than 60 kg shall be delivered in bundles. Sections beyond the above specification range can be delivered in bundles or can be delivered individually; and the length and weight of the bundled steel are limited." According to the above regulations, each production factory will formulate the number of bundled packages corresponding to different specifications of profiles. The following takes "hot-rolled ribbed steel bars (straight bars)" as an example for illustration:

[0003] Straight bar hot-rolled ribbed steel bars are generally delivered in a conventional length (i.e., the fixed length commonly said in the industry). Its production process is roughly as follows: fixed-length shearing → counting and separating steel → bundling and packaging → weighing → printing a label → warehousing → delivering to customers. For example, the number of bundled packages of φ12 ribs with a 12 m fixed length is 246. However, in the actual production process, whether using machine counting or manual counting, it cannot be guaranteed that each bundle is 246 (machine counting is mainly affected by factors such as irregular cross-sections of the steel bars cut by the fixed-length shear, color differences in the cross-sections, and counting errors of the machine itself. Currently, only a counting error rate of ≤±0.2‰ can be achieved; manual counting, as is obvious, will have a larger error rate). If the actual number of pieces is not verified and the bundling, weighing, and printing of the label are still carried out according to the standard number of pieces, there will be a situation where the label does not match the actual number of pieces. In the process of delivering steel by theoretical weight, if there are more pieces, the production factory will suffer losses and the customer will make a profit; if there are fewer pieces, the production factory will make a profit and the customer will suffer losses. Summary of the Invention

[0004] The technical problem to be solved by the present invention is in view of the above-mentioned deficiencies of the prior art. The object of the present invention is to provide a method for distinguishing the difference in the number of steel bars in a bundle, which can quickly and effectively make a preliminary distinction of the number of steel bars in a bundle, and point out the direction for subsequent verification and rectification of the number of steel bars in a bundle, so as to achieve the production goal of "fixed bundle and fixed number of pieces" for profile packaging.

[0005] The technical solution of the present invention is: A method for distinguishing the difference in the number of steel bars in a bundle, comprising the following steps:

[0006] Step 1. During continuous production, accurately verify that the number of steel bars in the first bundle is correct; obtain the weight of the first bundle of steel bars through a weighing system, and use the weight of the first bundle of steel bars as the reference weight

[0007] Step 2. Obtain the weight of the current bundle of steel through the weighing system;

[0008] Step 3. Compare the weight of the current bundle of steel with the reference weight to obtain the weight difference;

[0009] Step 4. If the weight difference is greater than or equal to the theoretical weight of a single piece of steel, it can be preliminarily determined that there is a deviation in the number of pieces of the current bundle of steel, and it is necessary to review and rectify; otherwise, take the weight of the current bundle of steel as the reference weight;

[0010] Step 5. Repeat Steps 2 to 4.

[0011] As a further improvement, it also includes calculating the theoretical weight of a single piece of steel according to the negative tolerance, and the calculation is as follows:

[0012] Theoretical weight of a single piece of steel = theoretical weight per meter × specified length × (1 + negative tolerance).

[0013] Further, when not considering the negative tolerance, mark the steel with a deviation in the number of pieces as the first color on the computer screen of the weighing system to distinguish it from the steel with normal weighing;

[0014] When considering the negative tolerance, mark the steel with a deviation in the number of pieces as the second color on the computer screen of the weighing system to distinguish it from the steel with normal weighing and the steel with a deviation in the number of pieces when not considering the negative tolerance.

[0015] Further, the first color is blue and the second color is red.

[0016] Further, according to the quotient of the weight difference and the theoretical weight of a single piece of steel, it can be preliminarily determined how many pieces are different, which can provide a reference basis for the subsequent review and rectification.

[0017] Further, when the reference weight is greater than the maximum theoretical weight of a single bundle, an alarm for excessive shear error of the steel is issued.

[0018] Beneficial effects

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] 1. In continuous production, when using the present invention to identify the number of pieces in the packaging of standard-sized steel, it is only necessary to accurately verify that the number of pieces in the first bundle of steel is correct, and use the correct weight and number of pieces of the first bundle of steel as a reference. It can effectively avoid verifying the number of pieces in each bundle of steel in continuous rolling production, and can assist the profile packaging to achieve the production goal of "fixed bundle and fixed number of pieces" with relatively simple means.

[0021] 2. The present invention preliminarily determines whether the number of pieces is accurate by comparing the weight differences between two consecutive bundles of steel, fully considering the influence of the cumulative error of the production equipment during use on weighing. Brief description of the drawings

[0022] Figure 1 This is the flow chart of the present invention. Detailed implementation manners

[0023] The present invention will be further described below in conjunction with specific embodiments in the accompanying drawings.

[0024] Refer to Figure 1 , a method for distinguishing the difference in the number of steel bars in a bundle, comprising the following steps:

[0025] Step 1. During continuous production, accurately verify that the number of steel bars in the first bundle is correct; obtain the weight of the first bundle of steel bars through a weighing system, and use the weight of the first bundle of steel bars as the reference weight

[0026] Step 2. Obtain the weight of the current bundle of steel bars through a weighing system;

[0027] Step 3. Compare the weight of the current bundle of steel bars with the reference weight to obtain a weight difference;

[0028] Step 4. If the weight difference is greater than or equal to the theoretical weight of a single steel bar, it can be preliminarily determined that the number of steel bars in the current bundle is deviated and needs to be rechecked and rectified; otherwise, use the weight of the current bundle of steel bars as the reference weight;

[0029] Step 5. Repeat steps 2 to 4.

[0030] During continuous production, when using the present invention to distinguish the number of steel bars in the standard-sized steel package, it is only necessary to accurately verify that the number of steel bars in the first bundle is correct, and use the correct weight and number of the first bundle of steel bars as a reference. It can effectively avoid verifying the number of steel bars in each bundle in continuous rolling production. With relatively simple means, it can assist the profile packaging to achieve the production goal of "fixed bundle and fixed number of bars".

[0031] The present invention preliminarily determines whether the number of pieces is accurate by comparing the weight differences between two consecutive bundles of steel, fully considering the influence of the cumulative error of the production equipment during use on weighing. Since the error of the production equipment accumulates continuously during use, usually in one direction, for example, if it accumulates in the positive direction, the shearing length of the corresponding steel will continuously increase; if it accumulates in the negative direction, the shearing length of the corresponding steel will continuously decrease. If a fixed value (the total weight calculated using the weight of a standard single-piece steel) is used to compare with the weight of the steel, there will be the following problems. Since the number of pieces in each bundle of steel is large, the deviation between the weight of a bundle of steel with no deviation in the number of pieces and the fixed value may be greater than the weight of a single-piece steel, which will cause misjudgment and identify the steel with no deviation in the number of pieces as the steel with deviation in the number of pieces. However, the shearing errors between single-piece steels in two consecutive bundles or a small number of bundles of steel are similar, that is, the weight difference between two consecutive bundles or a small number of bundles of steel with no deviation in the number of pieces is small, usually less than the weight of a single-piece steel. Therefore, by comparing the weight differences between two consecutive bundles of steel, it is possible to accurately and effectively determine whether the number of pieces is accurate.

[0032] This method also includes calculating the theoretical weight of a single-piece steel according to the negative tolerance, and the calculation is as follows:

[0033] Theoretical weight of a single-piece steel = theoretical weight per meter × specified length × (1 + negative tolerance).

[0034] For example, when producing φ12 screw GB / T 1499.2 - 2018, 12-meter specified length work order, its theoretical single-piece weight can be considered according to the lower limit of the negative tolerance (-6%), that is, theoretical single-piece weight = theoretical weight per meter × specified length × (1 + negative tolerance) = 0.888 kg / m × 12 m × (1 - 6%) = 10.02 kg.

[0035] When producing φ12 screw GB / T 37439 - 2019, 12-meter specified length work order, its theoretical single-piece weight can be considered according to the lower limit of the negative tolerance (-3%), that is, theoretical single-piece weight = theoretical weight per meter × specified length × (1 + negative tolerance)

[0036] = 0.888 kg / m × 12 m × (1 - 3%) = 10.34 kg.

[0037] When not considering the negative tolerance, the steel with deviation in the number of pieces is marked with a first color on the computer screen of the weighing system. The first color is blue. Of course, the first color can also be other colors to distinguish the steel with normal weighing.

[0038] When considering the negative tolerance, the steel with deviation in the number of pieces is marked with a second color on the computer screen of the weighing system. The second color is red. Of course, the second color can also be other colors to distinguish the steel with normal weighing and the steel with deviation in the number of pieces when not considering the negative tolerance.

[0039] Based on the quotient of the weight difference and the theoretical weight of a single steel product, it is possible to preliminarily determine the number of missing products, which can provide a reference for subsequent review and rectification.

[0040] When the reference weight is greater than the maximum theoretical weight of a single bundle, an alarm for excessive shear error of the steel product is issued, indicating that the cumulative error during the use of the production equipment has exceeded the limit, to remind the staff to promptly repair the production equipment, thereby indirectly detecting the cumulative error of the production equipment.

[0041] The above is only the preferred embodiment of the present invention. It should be noted that for those skilled in the art, without departing from the structure of the present invention, several modifications and improvements can be made, which will not affect the implementation effect of the present invention and the practicality of the patent.

Claims

1. A method for identifying the difference in the number of steel bars in a bundle, characterized in that, It includes the following steps: Step 1. During the continuous production process, accurately verify that the number of steel bars in the first bundle is correct; obtain the weight of the first bundle of steel bars through the weighing system, and use the weight of the first bundle of steel bars as the reference weight; Step 2. Obtain the weight of the current bundle of steel bars through the weighing system; Step 3. Compare the weight of the current bundle of steel bars with the reference weight to obtain the weight difference; Step 4. If the weight difference is greater than or equal to the theoretical weight of a single steel bar, it can be preliminarily determined that the number of steel bars in the current bundle is deviated and needs to be rechecked and rectified; otherwise, use the weight of the current bundle of steel bars as the reference weight; Step 5. Repeat Steps 2 to 4; It also includes calculating the theoretical weight of a single steel bar according to the negative tolerance, and the calculation is as follows: Theoretical weight of a single steel bar = theoretical weight per meter × specified length × (1 + negative tolerance); When not considering the negative tolerance, mark the steel bars with deviated number of pieces as the first color on the computer screen of the weighing system to distinguish the steel bars with normal weighing; When considering the negative tolerance, mark the steel bars with deviated number of pieces as the second color on the computer screen of the weighing system to distinguish the steel bars with normal weighing and the steel bars with deviated number of pieces when not considering the negative tolerance; When the reference weight is greater than the maximum theoretical weight of a single bundle, an alarm for exceeding the limit of steel bar shearing error is issued.

2. The method for distinguishing the difference in the number of bundled steel materials according to claim 1, characterized in that, The first color is blue and the second color is red.

3. A method for identifying the difference in the number of bundled steel bars according to claim 1, characterized in that, According to the quotient of the weight difference and the theoretical weight of a single steel bar, it can be preliminarily determined how many pieces are different, which can provide a reference basis for subsequent recheck and rectification.

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