FR2641290A1 - LOADER WEIGHING - Google Patents

Abstract

The invention relates to a loader-weighing machine. It will find its application in particular in the field of the textile industry and in particular, it will be intended to be integrated into a line for preparing textile materials, in particular upstream of a carding machine. The loader-weighing machine consists of at least a feed hopper 10 containing textile material to be carded as well as a feed table 12, equipped with a weighing system 14, receiving the material from the hopper 10. and regularly delivering, at the entry of the card 4, the textile material in mass flow sheet "d" at a speed VL. In addition, it comprises: means for measuring the instantaneous weight Pi on the feed table 12 and the speed VL of the web delivered; means 18 for processing and calculating, able to authorize regulation and to determine the flow rate D of the loader-weighing machine as well as the quantity Q of the material consumed between two predetermined instants T0 and T1, and to allow the display of the data.

Description

The invention relates to a loader-weigher. She will find

  especially its application in the field of the textile industry and in particular, it will be intended to be integrated into a line of preparation of textile materials, especially upstream of a machine i carding. In the field of textiles, it is known to supply carding machines with a constant mass flow rate of textile materials.

  by arranging, upstream of the cards, a loader-weigher.

  In this regard, it is known to store the textile material in a hopper which feeds a tray disposed on the beam of a balance. Thus, we dose the amount of textile loaded into the tray, and then poured on the deck of food carde. Such a weighing method naturally controls the flow rate of the textile material entering the card; however, this feed is carried out batchwise and does not allow

  control the flow instantly.

  Therefore, it is common, despite the control of the average value of the flow, to arrive at significant fluctuations that cause thickness irregularities in the carded textile material. In addition, sequential weighing requires additional handling time, which has an impact on the speed of the machine.

  input rate of the carding machine.

  Currently, the mechanization of machines and their automation is increasingly desired in order to increase on the one hand the speed of production, and on the other hand, the quality of the product obtained. To overcome these disadvantages, voluminal servocontrols have been proposed; these have made it possible to reduce the stresses due to weighing but do not take into account the variations of density of the material supplying the carding machines. In addition, to follow the productions and facilitate the follow-up of these, it is interesting to know some parameters of the manufacturing, parameters which will make it possible to appreciate the yield

  or the efficiency of the carding chain.

  The main object of the present invention is to propose

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  -2- a loader-weigher that allows both continuous weighing of the material supplying the carding machines, and allows regulation to deliver a mass flow rate that is almost constant in terms of

  pre-set instructions.

  One of the aims of the present invention is to provide a loader-feeder which allows continuous weighing, automatically at the outlet of a feed hopper for bulk materials. Another object of the present invention is to provide a loader-weigher which will deliver a constant mass flow rate, controlled by the weighing means at the input of the machine to card. Another object of the present invention is to provide a loader-weigher for supplying a carding machine which allows by display to follow the various parameters of the installation allowing including the control of the amount of material consumed at the loader as well as the flow in

entrance of carding machines.

  Thus, these manufacturing parameters, encrypted and codified may be used in the context of manufacturing data sheets and allow users an exact reproduction of the settings of a manufacturing on the other, o a possible refining

  these parameters and a rigorous control of production.

  Other objects and advantages of the present invention

  will appear in the following description which is not

  however, given as an indication only and not intended to limit it. According to the present invention, the loader-weigher, intended to be integrated in a textile preparation line, in particular upstream of a carding machine, constituted at least of a feed hopper containing textile material to be carded, as well as a feeding table, equipped with a weighing apron, receiving the material of the hopper and regularly delivering, at the entrance of the card, the textile material in a density web "at a speed VL, is characterized in that it comprises: - input means of the instructions, such as the desired mass flow 'd', and the target weight Pc at the feed table, -3- - means measuring the instantaneous weight Pi on the feed table, and the speed VL of the delivered web, - processing and calculation means, able to determine the flow of the loader-weigher and the amount of material consumed between two instants T and T1 predetermined The present invention will be better understood by reading

  the following description, accompanied by the annexed drawings which

are an integral part.

  FIG. 1 schematically illustrates a view of the various elements making up a carding chain and particularly a

  loader-weigher upstream of a carding machine.

  FIG. 2 shows in detail, schematically, the means of the present invention allowing continuous weighing, the regulation of the flow rate, as well as the materialization of the different

manufacturing parameters.

  The invention relates to a loader-weigher, intended to be integrated in a preparation line of textile materials or other heavy products especially upstream of a carding machine. In the field of textiles, it is known carding machines that allow in particular to treat the textile material such as wool, mineral fibers, Liberian or synthetic. A loader-weigher is a device that allows the feeding, such carding machines, of raw material, this

  with a mass flow adapted to the carding machine.

  Indeed, it is important to obtain, in such a case, a regular mass flow and a transverse homogeneity of the material

  textile in order to have a processed product of good quality.

  The loader-weigher therefore has the role of delivering at a speed of output VL substantially equal to the input speed of the card a predetermined amount of material, which is presented

  generally in a sheet whose mass flow d "is preestablished.

  The loader-weigher of the present invention will in particular this result according to the technical characteristics

  of the material to be treated and the machines treating it.

  FIG. 1 schematizes the various successive stations of a carding installation 1: the position is represented at 2

2 6 4 1 2 9 0

  4, the loader-loader, and the carding machine. In one embodiment, the feed station 2 is constituted by a storage box 5 in which the textile material to be carded is stored. More precisely, in this storage box 5 the material from the bales is placed manually or automatically by

  example by pneumatic conveyor.

  The storage box is also equipped with a continuous handling system that allows to extract some of the material

  carding cloth to feed the loader 3.

  In the embodiment illustrated in FIG. 1, the evacuation of the textile material is carried out by the cooperation of a bottom apron 6 and a climbing apron.

tips 7.

  Thus, the bottom apron 6, set in continuous motion, push the textile material to the apron 7, and the textile material, or more precisely the fibers, will entangle around the tips which will raise the material

textile in small quantity.

  In order to prevent the apron 7 from driving too many large packages of textile materials, it is advantageous to have a transverse eccentric or a rotationally-filled cylinder 8 which will push the textile material towards the bottom of the storage box 5.

  excess loaded on the deck 2.

  In addition, in order to clear the textile material of the peaks of the apron 7, and to allow the feeding of the loader-weigher 3 at the top of the apron 7

  there is provided a detacher apron 9 or a detaching cylinder.

  At the outlet of the latter, the textile material to be carded is directed towards the loader-weigher 3 and in particular to a feed hopper 10 which will serve as a buffer stock between the box of

  storage 5 and the carding machine 4.

  This hopper 10 will be made and supplied so

  traditional and will work advantageously at a constant level.

  This will make it possible to have a pressure exerted by the quantity of textile materials stored in the constant hopper and will favor the homogeneity and the regularity of the product delivered at low output of

2 6 4 1 2 9 G

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the hopper.

  For example, the level of the hopper 10 will be controlled by detection sensors that will react at the feed station to feed more or less abundantly the hopper

10.

  Moreover, it is advantageous to have a hopper whose volume is adjustable in order to adapt it according to the density of the textile material and the mass flow rate to be delivered. This volume variation can be achieved by any means and for example

  by modifying the positioning of the walls constituting the hopper.

  That is, the lower opening 11 of the hopper opens above a feed table 12 whose role is the creation of a sheet of textile materials density "d" from the material arranged in bulk in the hopper 10. Moreover, this tablecloth

  will be moved by a linear velocity marked VL, at the output.

  FIG. 2 shows in more detail the constitution of this feed table 12 which is formed at least by a roller

  delivery unit 13 and weighing apron 14.

  The delivery roll 13 is a cylinder whose periphery is crenellated to ensure the delivery and regulation of the amount of textile material leaving the hopper 10 at the level of

the low opening 11.

  The weighing apron 14 is substantially constituted by a conveyor with continuous movement, able on the one hand to generate a translational movement Vp of the textile material and,

  on the other hand, allowing the measurement of the weight resting on its surface.

  In this regard, the weighbridge 14 comprises means 15 allowing the measurement of weight, constituted for example by stress sensors on which the deck 14 will rest with its

training device.

  Thus, we will measure the weight of the complete deck and the weight of the textile material that rests on it. We can deduce, in

  deducting the tare, the weight of the material.

  In addition, the mass flow delivered by the loader will be deduced by interpreting the measured weight as a function of the surface Sp of the weighbridge and the determined linear speed Vp. However, in order to avoid the influence of the action of the delivery roll 13 on the feed table 12, the delivery roll 13 will advantageously be placed above a delivery deck 15 placed upstream of the weighbridge 14. Thus, the parasitic forces generated by the deposition of the material will be supported by this apron deliverer 15 and will not be reflected on the apron

  Weighing 14 so as not to influence the measurement.

  In the same spirit, it will advantageously be available downstream of the weighbridge deck 14 a food deck 16 whose role will be the translation of the density sheet 'd' to the systems

  drive 17 of the carding machine 4.

  As specified above, each of the elements of the feed deck 12 will be driven by variable speed motor bodies, independently adjustable, rotating at speeds marked Vr for the delivery roller 13, Vd for the deck apron 15, Vp

  for the weighing apron 14, and VL for the food apron 16.

  These various drive members will advantageously consist of geared motor gearboxes with variable speed to

  direct current or alternating current.

  Furthermore, according to the present invention, the loader-weigher 1 comprises an electronic assembly 18 adapted to perform the regulation, weighing and servocontrol of all

of the installation.

  As shown in FIG. 2, this assembly comprises, first of all, input means 19 for instructions such as, in particular, the desired mass flow rate "of the web at the inlet of the card, and the

  set point weight Pc at feed table 10.

  The assembly further comprises means 20 for measuring the instantaneous weight Pi on the feed table, and more precisely

on the weighbridge 14.

  Furthermore, the installation will also comprise means for measuring the various speeds at the level of the loader-weigher and in particular the velocity of LV of the delivered web, the speed Vp of the web on the weighbridge 14, the speed Vd of the food apron 15 as well as the speed Vr of the

delivery roll 13.

  With the aid of these different input information, the installation of the present invention will make it possible, by means of processing and calculation means 18, to regulate the various speeds, and to determine the flow rate of the loader-weigher. . Indeed, the flow rate can be calculated by summing at each instant instantaneous weights Pi measured divided by the length of the weighed web Lp and multiplied by the instantaneous speed of advance of the web Vpi. It will be especially given by the following relation: ## EQU1 ## In addition to these processing and calculation means 18 will be able to determine the amount of material O consumed between two instants TO and T1 predetermined. This quantity will be given by the following relation: T Q = E Pi To By the way. the installation will also include a display 21 which will allow the user to visually control

  the different data and calculations made.

  That said, said processing and calculation means allow the detection of the difference in weight AP between the instruction

  theoretical Pc and the actual instantaneous weight measured Pi.

  Depending on this difference, the installation will react automatically and the said means will allow the regulation of the speeds of the aprons according to the difference in weight Ap found and

  the speed VL of the input cylinders of the card.

  In this respect, the quantity of textile materials delivered on the delivery deck 15 being adjusted by said delivery roll 13, the processing and calculation means will act in particular on the speed Vd of the delivery deck 15 and the speed Vr of the delivery roll so that the quantity of materials, sent on the apron

  weigher 14, allows a minimum difference in weight Ap.

  In addition, the speeds Vr, Vd, Vp, VL, are linked together for obtaining the result and adjusted so as to avoid

  the ripple of the water table and measurement errors.

  Thus, a permanent servocontrol is provided which allows the automatic regulation of the different speeds according to the input instructions. The display will also allow you to know at any time:

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  The weight of the material present on the weighbridge 14, the difference in weight Ap between the desired weight taken into account as the set point Pc and the actual weight Pi, the quantity of materials Q consumed at the level of loader-weigher, for example in kilo, between two given instants, o o the possibility of monitoring the production per team, per hour, per day, the flow, in particular in kilo per hour, of the

  loader-weigher and therefore the carding machine at its entrance.

  That being so, we will automatically thanks to the adjustment and enslavement possible refinement of these parameters and a rigorous control of the production by a precise knowledge of the manufacturing parameters. This will notably improve the performance of the installation from the point of view of profitability and from the point of view

quality of the product obtained.

  Naturally, other implementations of the present invention, within the reach of those skilled in the art, could have been

  envisaged without departing from the scope of this application.

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Claims (4)

  1. A loader-loader (3) intended to be integrated in a textile preparation line, in particular upstream of a carding machine (4>, consisting of at least one feed hopper (10) containing the textile material to be carded as well as a feeding table (12), equipped with a weighing system (14), receiving the material of the hopper (10) and regularly delivering at the entrance of the card ( 4), the textile material in a sheet of density "d" at a speed VL, characterized in that it comprises: - means (19) of entry of instructions such as the desired mass flow 'd' and the weight set point Pc at the feed table (12), instantaneous weight measuring means (20) Pi on the supply table (12) and the speed VL of the delivered sheet, - means ( 18) for processing and calculation, able to authorize the regulation and to determine the flow rate O of the loader-weigher as well as the quantity Q of the mat consumed between two instants To and T1 predetermined, and to allow the display of data.   2. Loader-weigher according to claim 1, characterized in that said means (18) for processing and calculation allowing the detection of a difference in weight AP between the instruction   theoretical Pc and the instantaneous real weight Pi.   3. Loader-weigher according to claim 2, characterized in that the feed table (12) 'is constituted by a delivery deck (15) followed by a weighing apron (14) followed by a food apron (16). ), in continuous motion at respective speeds Vd, Vp. VL, and that the means (18) of treatment and calculation allow the regulation of the speeds of aprons delivery, weighing and food as a function of the difference in weight AP found, the speed VL of the deck (16) and flow mass desired.   4. Loader-loader according to claim 3, characterized in that the quantity of textile materials O delivered on the   Delivery deck (15) is adjusted by a delivery roll (13).   whose speed Vr is adjustable, and that the means (18) for processing and calculation act on this speed Vr so that the amount of material on the weighbridge (14) allows to have a 264C 129C -10- minimum AP weight difference.