MXPA00011617A - Process for forming bundles with an exact and predetermined number of pieces of bars, by means of counting up and forming bar layers directly over a cooling bed. - Google Patents

Abstract

The present invention discloses a process for the obtention of bundles (or also low-weight sub-bundles) of counted bars, with a counting operation and layer formation comprising an exact and predetermined number of pieces, which is performed directly over a cooling bed without the need of a bar counting system. The operative technique provides for all the bars exiting every rolling mill, a cutting by a shear into a pair of pieces having a differential length relative to each other, with a subsequent sequential distribution of the sheared bars to a braking and discharging system for discharging the same onto the cooling bed so as to form a pair of transversally spaced apart bundles. The counting operation of the precise number of bars so as to conform each layer comprising an exact and predetermined number of bars, is achieved by displaying the number of cycles of movile combs when the bars are transferred from said movile combs to a layer chain conveying system by an independent comm and. The layers formed in the two conveying bands having differential lengths, are lifted and conveyed to the bundle formation location by means of unloading carts also by an independent command in a separate manner and without mixing the bars or layers together.

Description

METHOD OF PROCESS FOR THE FORMATION OF PACKAGES WITH A EXACT AND DEFAULT NUMBER OF PIECES, THROUGH THE COUNT AND FORMATION OF BARS STRATEGIES DIRECTLY ON THE COOLING PLATE FIELD OF THE INVENTION The present invention refers to an innovative improvement of the system of final handling of bars from hot rolling, intended for the direct formation on the ironing of cooling, strata with an accurate count of the pieces that compose them. This is done at the end of the process, packages (or subpackages) composed of an exact and predetermined number of bars, cut to the desired commercial length and intended for a market that always requires more subpacks of small weight (eg of about 70 kgs. ), formed by bars of small section and of a limited number but exact as for the quantity of pieces.

EXISTING TECHNIQUE According to the existing technique, the hot-rolled bars, after the exit from the finishing box of the rolling mill, are cut to a certain extent with the Ref: 125387 dividing flying scissors, braked and unloaded on an ironing board for rakes. cooling on each tooth of the rakes, either individually if the rolling is done to a single line or in small groups if it is rolling with multiple longitudinal division commonly called "split lamination" (production of two bars or more in Simultaneously). The process of cutting in movement, braking and unloading of the bars in ironing is carried out according to the sequence described below by way of example and in which the following technical terminology will be used for the cut bars. - Ironing length = Lp = length of the cooling plate considered useful. Commercial length = Lc Length required by the market and submultiple of the previous one - Optimized length = Lo = Length of ironed, less "n" times the commercial length It should be noted that the optimized length Lo = Lp - ("n" x Lc ), depends on the system adopted for the optimized cut and consequently, the value "n" mentioned above, can be an integer equal to or greater than one. The process, according to the existing technique, is developed in the following way: the simple bar (or multiple if it is with "lamination") divided ") at the exit of the lamination terminator box and whether with thermal treatment in line or without it, it is cut by means of a dividing flying scissor, at the beginning to the length of the ironing Lp, until the system starts operating. optimization and from this the cutting to the optimized length will follow. Lo - a tracer located "downstream" of the scissors and operating on the tail of the bar, ensures that it does not suffer speed alterations with respect to the preceding bar during the cutting of the flying scissors when the material is no longer taken between the cylinders of the terminator box - in the entry way of the ironing, the material is subjected to braking by means of an adequate system for the progressive reduction of its initial speed, and either by natural braking or forced by electromagnetic brakes, according to the following sequence: Lp + Lp + Lp + Lp + + Lo + Lo + Lo + for the completion of the natural cooling, the material is discharged after braking, on a system of fixed and mobile rakes, with the same previous sequence, therefore, on the rakes of the plate, inexorably coexist bars that will have the full length of the ironing and other shorter ones with optimized length, whose quantity will depend on the chosen optimized cutting system. On each tooth of the rakes, simple bars or groups of two or more units will be deposited depending on the laminating system that is used (one or two threads, etc.) - at the end of the rakes the bars are unloaded with movement of " step by step "on a chain extraction system or similar, to be regrouped into strata. - from this aforementioned system, the bars are taken and deposited on a path of ironing exit rollers, with a single stratum conformation, in which bars of different length coexist and precisely, bars of length Lp together with bars of length Lo . The different length derives from the fact that the starting billet, originating from the final bar, does not have the optimized weight necessary to obtain bars that have all the same length, corresponding to the length of ironing and for the different dimensions of ^ Final product . - The roller path feeds a cold-cut scissors that performs the definitive cutting of the bars at commercial length Lc.

The following process of forming bar packages counted with exact number and pre-established pieces, is carried out according to the existing technique, "downstream" of the ironing, as follows: - the bars, after cutting with cold scissors at commercial length Lc, they are collected with an even end, in a single wide and compacted layer. From the mentioned strata containing a variable and imprecise number of bars, they will be successively evacuated in a pre-established number according to the quantity required for each package for sale and counted by the use of mechanical counting and separation devices. - the packages thus formed will undergo a fastening process through the application of restraint ties, tightening and / or lifting loops. - in case of need to preform light packets or subpackages, they are collected and tied separately before the composition of the large final pack. Taking into account that, due to the contemporary presence of bars with full length of ironed Lp and bars that will have the optimized length Lo, not presenting all the same length, the layers without empty spaces will not be available at any point of their development, when transported to the cold cutting scissors for cutting to commercial length Lc. According to the existing technique, therefore, it is not possible to operate in any other way than the preventive regrouping of all the bars after cutting to commercial length Lc into a single wide-width stratum, of which the number of bars required for the formation of the final packages or sub-packages. It is evident that we are facing a process incongruence involving contrary and somewhat contradictory operations given that the bars (originally well separated on the rakes of the ironing) are first grouped into wide strata to be successively resumed and subdivided into narrow groups by the use of mechanical counting devices, of difficult operation and little reliability, especially in the case of bars of small section where it is difficult to obtain the high precision of required counting.

Innovative method of process, object of the invention.

The scope of the present invention is to solve the technical problems limiting the previous "existing technique", by means of a process method able to allow the formation of strata of bars of commercial length or multiple of them, directly on the same ironing of cooling, having from the moment of its formation an exact and pre-established numerical composition. Said composition is then maintained, during transport through the cold scissors, up to the subsequent final assembly with the fastening of the packages and / or subpackets. The system foresees: - cut to measure differentiated and predetermined sequence, after the possible thermal treatment in line. - natural or possibly forced braking of the bars, followed by ironing, with equalization of tips. - strata formation with precise and predefined number of bars, directly on the cooling plate. transport without reciprocal mixing between contiguous strata, up to the cutting station at commercial lengths. - composition and binding of packages of varied weight, soon for its final storage. By operating in this way, the preventive regrouping of the bars is avoided and then proceeding to their subdivision as is done according to what is explained in the existing technique. The present innovative method of process, even using already known mechanical devices, tends to keep the numerical separation originally carried out on the iron from the beginning until the end, without intermediate spaces and obtains an absolute precision of counting given that it preserves the number of pieces that constitute a final package (or subpackage), regardless of the size of the laminate, even if it is small. The use, as indicated in the existing technique, of unreliable and inaccurate mechanical counting devices is therefore avoided.

With the present innovative method, returning to the technical terminology indicated above, it will then be: Lp (mt) = Length of the ironing, equal or multiple of Lc.

Lc (mt) = Commercial length required by the market Lo (mt) = Length of ironing less commercial length (Lp - (1 x Lc)) and having assumed by way of example, at the moment of the cutting of the first bar that enters the ironing, a value of the factor "n" = 1 for the optimized cut, the following sequence of cutting operation on the dividing flying scissors: I.- From the start of each billet and up to the input depending on the optimization system, all the bars are cut into two consecutive segments of differentiated length (a) + (b), where: (a) is a first long segment Lc, equal to the commercial length, plus (b) a second long segment. Equal to the ironing length of Lp, minus a commercial length Lc. II.- The last bars at the end of each billet, when the optimization system intervenes, will be cut to the optimized length Lo and its number is variable for each billet as a result of the optimization count according to the parameters of cutting and measuring . For greater clarity of the above, it is undoubtedly convenient to note that the configuration of point I, applies to all the material on arrival except the tail of each billet, whose resulting length hardly coincides with the length of the ironing. Adopting an optimized cutting system that allows to obtain at the end only bars of optimized length Lo = Lp - (1 x Lc), the last endbars of the billet will enter braking in the entry way only in pieces of length equal to Lo, as indicated in point II.

With the present innovative method, for each billet, bars to be unloaded on the rakes are sent to the track of entrance rollers to the ironing with a sequence such as: (Lc + Lo) (Lc + Lo) (Lc + Lo) +. (What ) + (Lo) + (Fig.l) where the simple partial sequences (Ls + Lo) will be downloaded together in line as if they were whole bars of length Lp. Consequently, it differs from the existing technique in that, as already said, it uses instead a sequence of unloading in ironing such as: (Lp) + (Lp) + (Lp) + + (Lo) + (Lo) + (Lo) + Obviously, the preceding considerations are also valid for a sequence of unloading in ironing with inverted different length such as: (Lo + Lc) + (Lo + Lc) (Lo + Ls) + (Lo) + (Lo) + All the considerations are valid either in the case of hot pressing process of rolling and natural braking material or with treatment previous thermal cooling in line with eventual forced braking by means of electromagnetic brakes. Unlike the existing technique, the new innovative method of process, allows to handle the length bars Lo separately from those of length Lc, by splitting the relative commands of advance in order to make them actionable reciprocally independent as it is described in more detail below. The drawing of Fig.2, schematically illustrates the new system of the process object of the present invention, according to which the counted bar strata are formed directly on the ironing and prior to cutting to commercial length Lc of the bars of optimized length It, they are transported without possibility of mixing until the final conditioning stations. Of the various equipment listed below, some are operable according to the existing technique while others are explained separately and the examination of the operative description of the method provides further clarification of the structural and functional characteristics of the invention and its advantages with rct to what is described in the explanatory chapter of the existing technique.

A.- Finishing lamination box Operation as indicated in the existing technique.

B.- Cooling system in line with one or more wires. Possibly functioning as described in the chapter on the existing technique.

C- Single and / or multi-thread feeder Operation as indicated in the existing technique.

D.- Scissor flywheel divider with reduced cutting cycle This is a start / stop scissors, ie start and stop for each cut, as in the existing technique, but innovative type, capable of a reduced cutting cycle to operate with precision a cut to commercial length Lc or multiples of the same, by means of the utilization of an opportune logic of control. At the high speed of entry to the ironing and short cutting, given the impossibility of having in each cut to commercial length Ls of sufficient time for a total stop of the machine and its immediate start, the movement of the scissors is pendular, producing only a deceleration of the blades (instead of a total stop) after each cut, with the subsequent reacceleration of the same for the reset of the operative speed for the subsequent cut. Eventual final rests of less length than the commercial Lc of the bar, due to the inaccuracy of the billet and the dimensional tolerance of rolling of the final product, are processed downstream of the scissors with equipment of the scissor type of scrap and / or device of recovery of short queues performed as in the existing technique.

E.- Entrance road with braking system The system operates with the rolling of one or more threads as in the existing technique. The rollers of the input path, rotating with overspeed, cause a distancing between the successive groups of bars (Lc + Lo), which although they are also spaced apart with a certain interval, behave in braking (natural or possibly forced with electromagnetic brake) as constituting a single bar.

F.- Fixed and mobile rakes The braked bars are unloaded on rakes with a sequence identical to that of arrival, that is: (Lc + Lo) + (Lc + Lo) + (Ls + Lo) +. . { Lo) + (Lo) + forming on the rakes two respective transverse bands Lc + Lo. The band Lo has all the teeth of the rakes occupied by bars while the band Lc has empty spaces since the bar portions with commercial length Lc are missing in correspondence with the optimized tail cuts. Obviously the longitudinal distribution in the ironing can be regardless of the transversal band Lc followed by the Lo band or vice versa of the band followed by the Lc band.

G.- Equalizing rollers In the case of rolling with "split lamination", any reciprocal draining of one bar with respect to the other due to the difference in braking behavior of the group of bars that are entering, are eliminated on the cooling plate , by means of the equalizing rollers, with an adequate conformation of the bottom of the channels thereof. The equalization of the tips of the bars Lo is done at one end of the ironing while the equalization of the bars Lc is made on the opposite side. The final result is constituted by a perfect arrangement of the bars on the ironing of cooling of two transverse bands Ls and Lo, longitudinally spaced apart from each other in a uniform manner.

H. - Chain of transfer and formation of strata with pre-selected number of pieces At the end of the rakes, the bars are unloaded on the transfer chains, which are driven by independent controls which allows a differentiated advance of each band of Lo of the band of Lc, obtaining that the latter recovers the aforementioned empty spaces. By means of a suitable advance sequence with step-by-step movements, as a function of the diameter of the bar, together with greater displacements for the mutual separation between adjacent layers, at the beginning of the transport chain for either the Lo bars or for the Lc is possible the formation of strata of lying bars.

The counting of the bars Lo is carried out considering the number of cycles of the mobile rake while the counting of the bars Lc is effected in the same way but being inhibited by the presence of the empty spaces. Thus, strata with exact and predetermined number of bars are obtained, equal to the numerical quantity necessary for the final formation of the sub-packages of small weight required for sale. The transverse spacing between successive strata avoids the danger of mixing and / or reciprocal superposition with the consequent loss of correct count of the component bars of each stratum, carried out previously.

I. Device of transfer of preselected strata in the chains From the transport chains, the bars are transferred in a precise number of strata by means of a particular system of carts that elevate, move and deposit the bars on the roller path of the bed of Cooling With the unfolding of the drive of the trolleys, the withdrawal and subsequent deposit can be done independently and in times not necessarily contemporary for the length bars Lo or Lc.

J.- Ironing exit roller path for the transport of preformed strata The path of ironing and delivery rolls to the cold cutting scissors is provided with suitable longitudinal spacers to ensure the transport of the strata without the risk of overlapping and / or mixing of the bars.

K.- Cold cutting scissors and evacuation rollers Only the length bars will be cut in the cold cutting scissors, since the bars with length Lc already have the commercial length and will only go free through the throat of the same. Downstream of the scissors, all the bars will have length Lc and by means of retractable stops existing in the path of At the outlet, the tips of the cut bars will be equalized to facilitate the transverse transport of the strata.

L.- Removal device for preformed strata At the end of the transport roller path, after the cold-cutting scissors, the layers composed of Lc bars are evacuated by a device of the cart type.

Translatable or with rotating arms and deposed on the chain of evacuation and transport.

M. - Preformed strand feed chain The conveyor chain to the strapping machines for small weight subpacks, are equipped with • spacers for the maintenance of the spaces between contiguous strata. At the end of the transport chain, each stratum of bars each constituted by the predetermined number of bars for the exact formation of the subpackages, falls into the pick-up cradles for the feeding of the binding machines for sub-packages of reduced weight.

N.- Small weight sub-packers The number of machines installed will be equal to the number of ties required for each packet. After the packets are tied, they are accumulated on a system of retractable arms until the required weight is achieved for the large packages, after which they are deposited on a roller path that transports them to the tying post of large packages. It should be noted that the resulting weight of the packages corresponds to the total number of component bars of a stratum and obviously is a multiple of the bars deposited in each tooth of the rakes.

The extent of the error in determining the exact weight of the package corresponds accordingly to the unit weight of the bars deposited in each individual tooth.

O.- Formation and binding of large weight packages According to the existing technique.

P. - Heavy and final evacuation of packages The operation of tying, transporting and weighing heavy weight packages continues as in the existing technique. It is noted that when only large packages are produced, without the preconfection of partial packets, the system can operate allowing knowing the exact number of bars that make up the large package.

It is noted that in relation to this date, the best method known to the applicant to carry out the aforementioned invention, is that which is clear from the present description of the invention.

Claims (10)

R E I V I N D I C A C I O N S
1. Having described the invention as above, it is claimed as property contained in the following claims: 1. - Process method for obtaining packages or subpackets of small weight of counted bars, with operation of counting and formation of strata, containing a number Precise and predetermined parts, made without the need of mechanical bar-counting systems, directly on the cooling plate, characterized in that it is made by using the following operative technique: a). - for each billet, from its beginning and until the intervention of the optimized cutting system on its terminal part, it is cut by the divider scissor at the entrance to the cooling iron, in groups of two pieces and in sequence: one of commercial length Lc followed by a second length optimized Lo, such pieces, although longitudinally separated, are sent to the braking as if it were a single bar with a total length equivalent to the useful ironing. b) - when the optimized cutting system starts to act on the final part of the billet, it begins to cut all the pieces with the optimized length Lo, sending them unitarily to the braking path. c) - by splitting the knobs of the chains located after the rakes, it is possible to separately advance the two transverse bars of bars with different length (Lo and Ls) that are formed after the equalization of tips on the rakes of the ironing . The strata of bars counted on the chains, are formed by the step-by-step advance of the same, depending on the diameter of the bar that is produced, with an adequate spacing between layers to avoid mixing, the exact count is assured with the calculation of the cycles of the mobile rakes, both for the bars with Lo and for the Lc, but for the latter, the counting is inhibited in correspondence with the empty spaces that necessarily appear when the cutting optimization acts, these spaces are then recovered and eliminated on the chain. d). - the transfer with lifting trolleys with independent command and equipped with suitable spacers, make it possible to transport strata of bars exactly counted and their deposit on the ironing exit way, equipped with longitudinal separators for immediate transfer without possibilities of mixing between strata, until the next stage of the process.
2. 2. - System according to claim 1, characterized in that it comprises a dividing flying scissor with reduced cutting cycle, with its corresponding drive unit for one or more rolling wires, suitable for sequential cutting at commercial length Lc, independently of 1 speed of the bar.
3. 3. - System according to claim 1, characterized by comprising, for the case of carrying out on the bars, an on-line thermal treatment, a series of electromagnetic brakes for the braking of the pieces cut and sent to the ironing in sequential mode and with a narrow variation of the positions of stop of ends and queues, including at high entry speed.
4. 4. - System, according to claim 1, characterized by include a series of appropriately arranged equalizing rollers, in order to obtain the equalization of the tips of the cut bars, either at commercial length or multiple of them, with the formation of transverse bars of bars with a constant reciprocal space.
5. 5. - System, according to claim 1, characterized by including downstream of the fixed / movable toothed rakes, a series of transport chains suitable for forming strata made with a predetermined number of bars of commercial length or multiple thereof, one behind another, the independence provided in the controls of the chains, allows the transfer of the long bars separately from the short Lc, making the individual count of each length.
6. 6. - System, according to claim 1, characterized by including at the end of conveyor chains strata, lifting devices, equipped with spacers for the transfer of a certain number of pre-assembled layers and deposit them on the path of ironing evacuation rollers, orderly and without mixing or stacking the bars, the unfolding of the controls of the evacuation system allows the removal of the bars of length Lo, independently of those with length Lc for their deposition separately on the exit path.
7. 7. - System according to claim 1, characterized by including a path of ironing evacuation rollers provided with longitudinal walls, for transport with separation between the layers, without mixing between them, previously made and provided with stops properly bicados to facilitate the spacing longitudinal between consecutive groups of strata.
8. 8. System according to claim 1, characterized by including a cold-cutting scissors for cutting the pieces of length Lo in order to obtain at the exit only pieces of length Lc.
9. 9. - System according to claim 1, characterized by including at the end of the path of transport rollers output of ironing, a series of devices for the removal and transport of the bars cut into strata, without mixing or stacking and deposited in the system of transport chains to the subpacket tying machines.
10. 10. - System according to claim 1, characterized by including a series of machines for making and binding subpackets of low weight and exact and predetermined number of bars, to compose the heaviest packages.