Method for the traceable preparation of a mixture to be sprayed, by parallel dosing of a plant aggregate and a moistened binder in a mixing tank

Abstract

The method makes it possible to continuously prepare a mixture to be sprayed with a plant aggregate (62) and a moistened binder (63) using two dosing stages (41, 42) fed in parallel with solid components. The moistened binder is obtained in a tank (5) for mixing dry binder (61) with water. Preparation is carried out in a machine (1) including both stages, the tank and a connection to a spray lance (8), thereby enabling the moistened binder leaving the tank to be pumped into a pipe (C1) connected to the lance. A control unit (120), which has at least one link (L5) with sensors (C5) that detect operating parameters at one or more locations in the machine, controls the dosings carried in the stages according to the preprogrammed parameter values including at least one flow rate of the dry or moistened binder, and the parameter values detected by the sensors.

Description

A traceable preparation process for a sprayable mixture involves the simultaneous dosing of a plant-based aggregate and a moistened binder in a mixing tank. technical field

[0001] This disclosure relates to facilities used for spraying materials, such as lightweight concrete or mortar, in the building industry. It specifically concerns a traceable preparation process for a sprayable mixture involving the simultaneous dosing of plant-based aggregate and a moistened binder in a mixing tank. Previous technique

[0002] In the field of low-density concrete spraying, in construction, it is known to obtain lightweight concrete by mixing binder and aggregates which can be based on plant components, for example with a view to spraying it for the construction and thermal insulation (interior or exterior) of buildings, renovation. Processes involving low-density concrete all tend to reconcile at least some of the following objectives: - simplicity of operation, minimizing user intervention; - dosage efficiency, the water intake must be controlled (typically reduced during its incorporation); - maintaining the quality of the mixture to be sprayed during projection (or guniting).

[0003] Examples of suitable binders include air-hardening binders such as slaked lime, hydrated dolomite, and plaster. A moistened binder can be obtained by mixing it with water during a water incorporation step. The binder is preferably based on a compound containing calcium carbonate (Ca). It may also be clay-based. By "air-hardening binder," we mean binders whose setting results from carbonation, particularly by atmospheric CO2. Such a binder may optionally be combined with a fine pozzolanic reagent.

[0004] To date, the ergonomics of the spraying process are unsatisfactory. Multiple workstations are required, creating physical strain and constraints during the operations necessary to achieve the proper mixture. Operators are exposed to dust, while handling and monitoring necessitate the near-constant presence of three different operators.

[0005] Document FR 2915702 describes equipment for projecting a mixture of lime and hemp, which includes several operational stages: - loading stations which use augers and are arranged with a mixing area to mix the respective raw materials dry; - a transfer and distribution station for the mixture which remains dry, including a sluice gate; - an insufflation unit so that the dry mixture distributed by the airlock is then blown into a transport pipe (by a horizontal airflow); and - a wetting ring, allowing the water (sprayed water) to be integrated with the mixture right in the projection lance, before a spray outlet. This type of equipment cannot be easily used for continuous, high-quality operation. The distribution of components in the dry mix is ​​difficult to control without active presence. operators are needed at the various loading stations, in addition to the operator responsible for holding the spray nozzle. Furthermore, setting up the equipment is very time-consuming.

[0006] More generally, dry spraying methods, which involve mixing raw materials in a dry state with hydration occurring only just before the nozzle exits, are not considered satisfactory for the continuous spraying of compressible concrete, where the aggregates are not embedded in a predominant binder mass. Indeed, with a dry spraying method, losses due to rebound off the treated surface are greater than with the wet spraying method. Undesirable blockages and agglomerations occur at the end of the transfer because the mixture is more irregular.

[0007] In addition, with this method, some of the binder may become suspended in the air, causing mists and the release of irritating dust. There is therefore room for improvement in reducing operator interventions and facilitating the operation of a machine projecting a mixture including a binder, water and plant aggregates, while allowing a mixture with good cohesion between the binder and the aggregates to be obtained. Summary

[0008] This disclosure aims to improve the situation. To this end, a process is proposed for preparing a sprayable mixture by carrying out two separate, parallel dosings of a plant-based aggregate and a moistened binder obtained in a mixing tank. The process is implemented using a mixture preparation machine designed and configured to connect to a spray nozzle. The process comprises the following steps: - use a control unit connected to a parameter detection set arranged at one or more locations on the machine; - to carry out an initial dosage to provide an initial flow rate of dry binder, the initial dosage being carried out in a first dosing stage; - carry out a second dosing to provide a second flow rate of plant-based granulate, the second dosing being carried out in a second dosing stage operating by dry process; - to receive, in said tank equipped with an agitator, water and the dry binder supplied at an outlet of the first dosing stage, to allow the moistened binder to be pumped from an outlet of the tank; in which several control steps are carried out by the control unit in order to: - control the first dosage and control the second dosage, for example by ordering the first dosage on the basis of pre-programmed parameter values ​​including a parameter representative of a flow rate of a material including the dry binder, this flow rate being to be supplied (by the machine) upstream of the projection lance.

[0009] This preparation method allows for independent adjustment of the feed lines, while also regulating the output flow rates of solid raw materials at the dosing stage outlets. Conveyors in these feed lines can be instrumented (by measuring elements or detection from the detection system), for example, to estimate / determine The control unit quantitatively measures the masses dispensed into the dosing stages. It allows the input of parameters useful for regulating the dispensing into and / or extraction of components from the dosing stages. In this process, respective flow rates, preferably mass flow rates, of the plant aggregate and the moistened binder to be conveyed to the projection lance are typically set, using the control unit, according to pre-programmed parameter values ​​and parameter values ​​detected by the detection assembly.

[0010] The process allows for the continuous preparation of a mixture of plant-based granules and a moistened binder, using two dosing stages supplied in parallel with solid components. Preferably, this process incorporates a level of automation and / or a determination of the continuous operating time allowed by the bags / quantities of solids deposited on the two feed lines of the respective dosing stages. For example, during operation with the mixture being sprayed by the spray lance, a length of conveyor element(s) and / or other relevant supply conditions can be planned / taken into account to allow for 20 minutes or more of autonomy before requiring replenishment of solid raw materials (plant-based granules and dry binder).

[0011] The moistened binder is prepared in a mixing tank, which can be fed directly from the first dosing stage. This allows for the isolation or closure of the dry binder flow to the tank. The preparation takes place in a machine, possibly mounted on a trailer, comprising both stages, the tank, and a connection to a spray lance. This connection allows the moistened binder from the tank to be pumped through a hose leading to the lance. The control unit, using pre-programmed parameter values ​​(including at least one flow rate for the dry or moistened binder), takes into account operating parameters (detected at one or more locations on the machine) to control the dosing performed in the stages. By recording the different parameters, traceability can be advantageously obtained.

[0012] The machine for implementing the process may be equipped with a control cabinet or interface and / or a remote control, for example, one mounted on the spray lance. More broadly, the control unit may allow operator input / registration via a human-machine interface. The preparation process is optimized to allow spraying with minimal human intervention. - the remote control or interface can offer at least the possibility of starting and stopping the projection, as well as a button or part of the interface for adjusting the flow rate at the outlet of the lance (at least two speeds can be obtained for example). - possibility of programming the mixtures according to the use / target (for example wall or roof) and the binder / aggregate pairs used. - possibility of recording sensor data or information, in addition to entered parameter values ​​(input values), to allow traceability / characterization of the mixture that was projected by the lance connected to the preparation part of the machine.

[0013] With this arrangement, the machine assembly can integrate the loading stations in parallel with, in addition to the aggregate dosing (the flow rate of plant-based aggregate can be controlled), the The ability to control important parameters related to the preparation and / or distribution of the moistened binder in real time: not only is the dry binder flow rate adjustable by controlling the first dosing stage coupled to the tank, but actual flow rates before the connection can also be advantageously controlled, for example in a coordinated manner, by using the sensor(s) provided in the tank. This eliminates the need for an operator to monitor feed levels, thus improving the reliability of the spraying process. The device / machine is compatible with a closed volume tank, so that dust-related difficulties can be eliminated in parts of the device located downstream of the loading stations (downstream in the direction of flow of raw materials).

[0014] The tank can be instrumented, with the ability to monitor / detect a level by comparing it to one or more fill thresholds. Typically, the tank may have a first, lower fill zone, where an agitator element of the agitator equipment extends, and a second fill zone located above the first fill zone, with the threshold being set, for example, to represent a height level that is higher than the first fill zone (the first zone where the tank outlet may be located). It is understood that the risk of blockages in the pipes / pipes is reduced, as the sprayed mixture can be homogeneous. Furthermore, the sensor(s) can guarantee that the correct dosage has been achieved: traceability of the quantities of raw materials can typically be ensured.

[0015] Examples of plant-based aggregates (typically lightweight) include hemp, such as hemp hurd (the non-fibrous part of the hemp stalk) and / or other hemp components, as well as wood, reed, flax, and cork. In the system, the first dosing stage can be smaller or narrower than the second dosing stage, for example, by being less wide and shorter (smaller vertical dimension). Screeners for both stages can, however, be located at the same height (the second dosing stage may have a deeper hopper than the first dosing stage). The absence of humidification in the respective dosing stages (in plant aggregate and dry binder) makes maintenance steps easier.

[0016] According to one particular feature, the process includes the detection, by the detection system, of at least one parameter representative of a fill level in the first dosing stage and / or in the tank. Alternatively or in addition, the detection system is also used to detect / determine at least one parameter representative of a fill level in the second dosing stage.

[0017] In some embodiments of the process, one or more of the following provisions are provided: - the ordering steps include an order for transport of the dry binder, which is preferably fed into the machine in a conditioned state in bags. - the machine may include a receiving structure equipped with a drop-off area and arranged to allow at least one bag to be dropped, with a conveyor assembly which moves a dropped bag and allows the bag to continue transporting out of the drop-off area. - The conveyor system (which belongs to the means of transport) is capable of transporting each deposited bag to a discharge zone which may be located above / directly below a hopper of the dosing stage corresponding to the solid component thus transported. - depending on the feed line considered (for aggregate or dry binder), the transport command is a function of a value representing a flow rate in dry binder or in moistened binder. - this value can be selected as one of several pre-programmed values ​​available using a human-machine interface connected to or part of the control unit.

[0018] More broadly, the process can use an input interface to record a projection flow rate command, knowing that two predetermined projection flow rates (at least two) can be available via the input interface, which allows, for example, differentiation between low flow rate operation and high flow rate operation, with the possibility of directly choosing between one of these two flow rates. In the options, at least three flow rates can be chosen from a selection of pre-programmed flow rates.

[0019] According to a particular feature, a communication step, via an interface connected to the control unit, is carried out to provide quantitative indications representative of a number of bags of dry binder and a number of bags of plant aggregate / light aggregate to be deposited on two depositing areas provided on the machine, and in which the transport of the dry binder is carried out automatically (without manual opening) of the bags containing the dry binder, using cutting and / or emptying means provided on the means of transport to separate the dry binder from the walls of the bags (opened / cut containers formed by the empty bags).

[0020] In some options, the process may include: - a step of recording parameter values ​​provided using sensors belonging to the detection set, these values ​​being for example representative of: a flow rate of dry binder at an inlet of the tank or of moistened binder at the outlet of the tank; and a flow rate of plant aggregate at the outlet of the second dosing stage. - one or more transport stages, by means of transport of the machine which include a first feed line and a second feed line arranged in parallel, for the transport of bags respectively filled with dry binder and vegetable granulate, to a discharge part. - a discharge, typically in neighbouring / adjacent discharge areas, of the dry binder and plant aggregate, knowing that the discharge portion may include: a first discharge area belonging to / planned on the end of the first feed line, for the discharge of the dry binder to the first dosing stage; and a second discharge area belonging to / planned on the end of the second feed line, for the discharge of the plant aggregate to the second dosing stage. - a programming of the composition of the mixture to be projected, which is carried out to allow a composition parameter to be included in the pre-programmed parameter values. - a control, by the control unit, of at least one transport (of solid components) on one of the two tracks / lines during the transport stage(s), at least one of the first and second dosing stages being controllable by the control unit, in order to adjust: a supply level for each of the first dosing stage and the second dosing stage; and an output flow rate for each of the first dosing stage and the second dosing stage. It is understood that the process can have adjustable speed / flow rate before the start of the projection. The discharge areas can be located opposite the bag drop-off areas.

[0021] A connection between the moistened binder and the plant granulate stream can be made in the spray lance. This allows for two final conveying pipes: one pipe connects to a jacket or pump defining the flow rate of moistened binder, while the other pipe is connected to a sluice gate or similar outlet supplying the plant granulate stream, typically mixed with compressed air blown in by a blower unit.

[0022] According to one particular feature, the process includes communication between at least one sensor on the tank and the control unit. This communication allows the control unit to automatically modify a feed parameter of one or both of the dosing stages based on the tank's fill level. Data from at least one sensor may be recorded. In options, the control unit can control at least one of the following: an output flow from the tank of moistened binder, the flow of plant aggregate and the determined flow of dry binder, based on information representative of the tank's fill level. More broadly, data received by the control unit may include, in particular: - representative of at least one tank filling level; and - representative of at least one level of filling with dry binder, before humidification, in the first dosing stage.

[0023] The dry binder is preferably in the form of lime. The lime is poured vertically by gravity into the vat, through an opening at the top of the vat which connects with the outlet of the first dosing stage. In the process, the lime can be poured into a hopper of the first dosing stage, a closed circulation path of the lime being made between an outlet (for example at a low point of the first dosing stage) of the hopper and the projection lance, a conduit or pipe allowing the moistened binder to circulate from the tank to the projection lance. In machine / device construction options for implementing the process, the tank is: - equipped with a dust-barrier lid; and - designed to delimit an enclosed interior volume that forms part of the enclosed traffic lane.

[0024] In examples of implementation, the process includes at least one of the following provisions: - the control unit receives a stop command activated using an interface provided on the projection lance. - A stop step initiated by the stop command involves stopping the flow (driven from the outlet of the second dosing stage) of the plant granulate, which preferably includes hemp, towards the projection lance, initially while maintaining air circulation (for example using a blower unit) in a pipe or conduit used for the pneumatic transport of the plant-based granules up to the projection lance. - the stopping stage includes taking into account the length of said pipe or conduit, in order to stop a pump planned at the outlet of the tank in a second stage. - the second time is offset from the first time and can correspond to the complete absence of supply of plant granules to the projection lance / moment (the second time being approximately the precise moment - or just after / no more than a few seconds after - when this supply ceases).

[0025] Air circulation can be stopped shortly after the second stage or simultaneously. It is understood that the stop control is effective in minimizing material losses, given that the activation or deactivation of the blower can be decoupled from, or offset / delayed from, the circulation of the moistened binder downstream of the tank (circulation typically enabled by a screw and jacket pump or similar pump). In design examples, the granulate outlet may be provided in a blower valve and the airflow entering the pipe connected to this valve for sending granulate to the nozzle.

[0026] The introduction of high-pressure air can be controlled independently of the presence or absence of aggregate in the rotor (in the rotor cells) of the airlock. The following can be planned sequentially: - The sending of hemp into the rotor (into the outlet part of the second dosing stage) is stopped, while the blower / blower unit continues to operate. - The length of hemp pipe, entered / stored in a characteristic table (correspondence table), allows the stop of the moistened binder pump (which can be lime milk) when there is no more hemp to come out of the lance. - The blower stops.

[0027] The process may also include a power outage including: - a stoppage of the first dosing stage and / or of a first part of the conveying system supplying the first dosing stage in order to stop a determined flow of dry binder; - a shutdown of the second dosing stage and / or a second conveyor section feeding the second dosing stage in order to stop the flow of plant-based granules; and - control of valves from a set of valves by the control unit. Typically, valve control allows: - during a first mode corresponding to mixing in the tank, to maintain a first valve element (of the valve assembly) open in order to supply water / aqueous solution to the tank with a flow rate which is preferably adjustable, while a second valve element of said valve assembly closes a cleaning path in fluidic connection with a closed volume of the tank; - during a second mode corresponding to a cleaning of the tank, to close the first valve element of said assembly while the second valve element of this valve assembly is open for the flow of a cleaning liquid. - an activation of the second mode, which can be carried out by the control unit (automatically) during a shutdown phase of the first dosing stage and the second dosing stage.

[0028] The cleaning fluid can be pressurized by passing through a nozzle and / or supplied from a pressurized tank or a conventional water supply. The control system can activate / deactivate and, for example, coordinate the supply valves intended for the different components of the mixture prepared in the tank. Coordination can also be achieved to slow down or stop the flow of plant-based granules at the second dosing stage.

[0029] In a preferred mode, the process uses a counting or weight measurement sensor (for solid raw material) to estimate what is conveyed / transported and dispensed into each dosing stage. For example, the process involves using a sensor in the conveying equipment to count bags on a feed line selected from a feed line for bags of dry binder and a feed line for bags of plant-based granules. Additionally or independently, the process may include an alert step to warn of a deficiency, on one of the feed lines or in one of the dosing stages, of solid material (aggregate or dry binder), in order to inform of the need for the addition of an additional bag(s) in a loading area of ​​the means of transport (dedicated drop-off area for example provided for each feed line, at an end opposite to the discharge area).

[0030] Depending on one particular feature, the machine or device includes a control means capable of controlling at least one of the following: the output of moistened binder from the tank, the output of plant-based granules, and a predetermined output of dry binder, based on information representing the tank's fill level. The input of water or aqueous solution may be controlled, insofar as water is part of the mixture formed in the tank. Alternatively, the water flow rate may be a fixed value chosen at the outset, with the possibility of stopping the water flow when the fill level exceeds a threshold and / or when a failure to supply dry binder is detected (for example, by a sensor on the dry binder feed hopper and / or by detection of an insufficient tank fill level due to this failure to supply dry binder).

[0031] In embodiments of the preparation and projection machine / device used for the process, one or more of the following features may be employed: - two conveyors (one for the dry binder, the other for the plant aggregate) are arranged in parallel on a support structure, for example opposite a traction link of a trailer equipped with the support structure. - the tank is placed on a platform of the support structure, being positioned under the first dosing stage and, preferably, under part of a conveyor coupled to the first dosing stage. - the first dosing stage and the second dosing stage are adjacent and mounted on the platform of the support structure, on the same side with respect to the blower unit also mounted on said platform. - the first dosing stage and the second dosing stage are each provided with a feed hopper, so that the device comprises a first hopper and a second hopper which are functionally separate and elongated in the same direction. - the dry binder supply is formed by a descending conduit (for example crossed by a vertical axis) which extends from the first dosing stage to join a top opening of the tank, so that the tank is underlying the first dosing stage. - the tank has a lid or upper wall element, which includes the upper opening and on which a means for rotating the vertical stirring shaft can optionally be attached.

[0032] In one particular design, the tank outlet incorporates or is traversed by a rotating element, which rotates around a horizontal axis perpendicular to the agitator shaft and contributes to the discharge of the moistened binder. This rotating element may be part of a pump to send / distribute an outgoing flow of moistened binder, typically with a flow rate adjusted according to the rotation of the rotating element, to the spraying section via a flexible hose. The pump, which distributes this flow, may be a helical screw type and has, on the outside of the tank, a termination fitting for attaching a flexible hose separate from the pneumatic conveying line.

[0033] The tank can be cleaned by a cleaning cycle activated after a continuous spraying phase. To enable this type of cleaning, the process includes an actuation step: - means of cleaning, to carry out cleaning by spraying a liquid from the top of the tank, these means of cleaning being separate from a water supply used during mixing (mixing phase) to produce the homogenized moistened binder. - a shutter to obtain a position of the shutter which releases the lower purge orifice, provided in a bottom of the tank, which allows the cleaning liquid to be evacuated (with the impurities, particles of matter detached from the tank and detached from the agitator equipment provided in the tank).

[0034] The process involves spraying / projecting the mixture using a lance, with continuous phases, requiring no operator intervention other than the one holding and directing the spray lance. Optionally, the machine's control unit can shut down the first dosing stage and / or the first conveyor section feeding the first dosing stage to stop the predetermined flow of dry binder, as well as the second dosing stage and / or the second conveyor section feeding the second dosing stage to stop the flow of plant-based granules. This can halt the upstream supply to the tank and the junction when measured / determined parameters indicate an approaching supply shortage or a lack of raw material demand, as the operator reaches the end of their spraying / projection task. The control unit can also activate or deactivate raw material supply phases depending on the water supply being made to the tank, possibly with real-time reactions.

[0035] The process allows for the automation of the preparation of the multi-material mixture composition to be sprayed, including the plant aggregate and the moistened binder, with at least one sensor or detection part located in a detection zone placed upstream of the tank, for example by having a sensor that can detect a filling level of a hopper belonging to the first dosing stage. It is understood that the device can be configured to allow communication between the tank and the control unit, so that a feeding stage of one or both of the dosing stages can be automatically modified based on data received by the control and automation unit. This data may include, in particular: - representative of at least one tank filling level; - representative of at least one level of filling with dry binder, before humidification, in the first dosing stage; - representative of a state of supply of the dry binder supply line, upstream of the first dosing stage.

[0036] In machine operation, the process includes a start-up cycle that can be controlled by entering setting parameters, for example using a screen (touchscreen) and / or an input interface, which may include: - a type of plant aggregate, with where applicable its density and / or type of packaging (20 or 30 kg bag, or other capacity to be specified). - a length of the blow pipe installed on an outlet of the second dosing stage. - a type of binder, possibly with a level of grain fineness (which can be reflected by the specific surface area in cm²) 2 / g) and / or its density. - a length of the supply / sending pipe for the moistened binder placed on an outlet pipe of the tank. Within the same plant, such as hemp, parameterization is also possible, with for example a density parameter (which can depend on the fiber content, the type of hurd, the type of raw cut or ground in bulk).

[0037] The device may have a first zone for depositing bags containing selectively / exclusively plant-based aggregate (of a specific, unchanging type, for example, defined by a parameter) and a second zone for depositing bags containing selectively / exclusively dry binder. These two zones are separated laterally / on one side of the tank. The device may have: - a first screener, associated with the first dosing stage (this screener allowing the filling of a hopper in this first stage); and - a second screener, associated with the second dosing stage (this other screener allowing the filling of a hopper of this second stage),

[0038] In some preparation process options, the tank is pre-filled with water, for example, to at least a predetermined level. The dry binder is fed into the tank, and the agitator is activated and rotated to obtain a homogeneous, moistened binder. Priming can be performed on the screw pump side to force the moistened binder out of the tank. This moistened binder can then flow through the delivery pipe, for example, to a valve or shut-off device on the pump where the respective flows are joined. After the start-up described above, the device can operate continuously, for example, by allowing the selection or input of a desired spray flow rate. The tank for forming the moistened binder can function as a reservoir to supply the moistened binder according to the required spray flow rate. The supply of dry binder can be automated and regulated according to the fill level(s) determined by the sensor(s): this moistened binder has a homogeneous, constant composition and can be sent to the lance or spray nozzle by the motorized pump coupled to the tank, which can extend radially outwards from a side wall of the tank. This pump is of the rotary screw type (by example with an eccentric screw, like the Moineau™ pump). In implementation examples, the moistened binder / hemp mixture is made downstream of this pump, in the portable lance.

[0039] It is understood that the moistened binder is prepared during this initial phase / cycle, a phase during which spraying does not yet begin, as the air blower unit's compressor remains off until the operator initiates a spraying / running cycle. The pump, which is primed by being connected to the moistened binder delivery hose, starts as soon as the plant material reaches the spray lance, allowing the moistened binder to flow into the lance via the connection. At the end of the spraying cycle, the operator can stop the device, typically by pressing an on / off button (which may be located on a remote control), thus increasing the flow rate at the outlet of the second dosing stage. The air blower may continue to run for a short time to empty the plant-based granulate pipe. As soon as this pipe is empty, the pump stops to halt the delivery of the moistened binder.

[0040] In the event of a tank stoppage and / or a prolonged interruption of the spraying process, for example, reaching or exceeding 30 minutes, an interface may recommend cleaning. Regardless of any cleaning alert mode, the moistened binder can be cleaned within the tank. The tank is a mixing tank or mixer unit equipped with at least one cleaning nozzle mounted on a tank wall opposite the tank bottom. A drainage opening is provided in the tank bottom for evacuation during the cleaning phase through a lower tank passage, separate from the outlet for the moistened binder during a spraying cycle. More broadly, depending on the use (for example, spraying on a roof or a wall), the effective flow rates to be brought to the junction can be adjusted without intervention on the vertically mounted agitator tank: the device can be programmed differently, with an adjustment of the mass percentages in the binder / aggregate pair, while taking advantage of the information from the sensors. Brief description of the drawings

[0041] Other features, details, and advantages will become apparent upon reading the detailed description below and analyzing the attached drawings, on which: Figure 1 is a perspective view illustrating a machine for preparing a spray mixture, before the hose is installed to deliver the moistened binder to the spray lance. Figure 2 shows a non-limiting example of a two-stage metering arrangement arranged in parallel; this arrangement could be part of the machine shown in Figure 1. Figure 3 illustrates, by a longitudinal cross-sectional view, a part of the device / machine illustrating the path of the binder, which is supplied and dosed as a dry binder before joining the tank forming the mixer of the device. Figure 4 is a perspective view illustrating an example of the arrangement of the tank forming the mixer of a device / machine according to an example embodiment, here with the inside of the tank visible through transparency. Figure 5A schematically illustrates an automated operating mode, using a sensor-equipped section mounted in the tank of a device / machine for preparing and spraying a mixture including plant-based granules and the moistened binder prepared in the tank. Figure 5B is a perspective view of an agitator having two stirring elements, usable in the tank. Figure 6 shows, by schematic view, an example of a spray lance or nozzle, suitable for complementing a machine / device like the one shown in Figure 1, allowing the moistened binder and the plant aggregate to be projected together. Figure 7A illustrates, by a top view, an example of machine arrangement with two adjacent discharge zones, at which the contents of the bags are discharged by gravity into either of the dosing stages, while the container (bag) can be discharged horizontally beyond its associated discharge zone by joining a bag extraction module. Figure 7B shows an example of grid modules for a pair of screeners. Figure 8 shows part of the means of transport of the supply device, in an option integrating cutting elements on the transport paths for both types of bags, away from the respective drop-off areas. Figure 9 shows a flowchart schematically reflecting steps that can be used to control certain parts of the means of transport and adjust material flow rates. Figure 10 is a flowchart illustrating steps that can be carried out and combined, in a non-limiting example of a process using two feed lines, a plurality of sensors and two dosing stages, one of which feeds a mixing tank to obtain the moistened binder. Description of the implementation methods

[0042] In the drawings, some dimensions may be exaggerated for illustrative purposes. Throughout the figures, the same reference numerals designate identical or similar elements. The Z direction denotes the vertical and the Y direction a transverse direction of width. In all that follows, reference is made to a tank 5 having a single internal volume V5 (see Figure 3), without this being a limitation on the total number of tanks that a device 1 for preparing and spraying a mixture of moistened binder and plant granules may have. In what follows, reference is also made to MT transport means equipped with conveyors, including in particular a first conveyor assembly selectively used for the dry binder 61 and a second conveyor assembly selectively used for the plant aggregate 62, without limiting the transport structure that a machine 1 may have for preparing a mixture of moistened binder and plant aggregate. The mixture is projected via a projection lance 8, with a junction J to obtain this mixture, which may be in this projection lance 8, for example as shown in Figure 6.

[0043] As shown in Figure 1, the device forming the machine 1 may include a support structure 3 which is, for example, integrated into a trailer 10, optionally providing a platform P10 for the fixed mounting of various components of the device 1. The trailer 10 may be of the double-axle type. An external frame 100 may be provided to protect the components, with the additional possibility of covering this frame 100, for example, with removable tarpaulins (such as a roof tarpaulin for a marquee, for example). If necessary, parts Motorized or dangerous areas are not made accessible laterally, using at least a barrier or gate, such as a wire mesh gate in some options.

[0044] Device 1 includes, on support structure 3, a first dosing stage 41 supplied with dry binder 61 and a second dosing stage 42 supplied with plant granulate 62. MT transport means, typically in the form of conveyors, are provided to allow the feeding of each of the dosing stages 41 and 42, in parallel. In implementation options that improve ergonomics (to minimize or eliminate the physical strain of operations), the loading of raw materials can be facilitated by: - having a first loading area, on which at least one B1 bag (closed / unopened bag) containing the dry binder 61 can be placed; and - by having a second loading area, on which at least one B2 bag (closed bag) containing the plant granule 62 can be placed.

[0045] Upward-sloping conveyors can be used to form the MT transport units, which move bags B1 and B2 from their respective loading areas to a higher hopper area. The MT transport units are, for example, distributed in parallel to raise the respective bags B1 and B2 to the following level: - a first screener to feed a hopper (here through a top opening) constituting the receiving part of the first dosing stage 41; and - a second screener to feed a hopper (here through a top opening) forming the receiving part of the first dosing stage 41. Although an arrangement with a right-hand conveyor for bags B1 of dry binder and a left-hand conveyor for bags B2 of lightweight aggregate is illustrated in Figure 1, other arrangements can be made for feeding bags B1, B2 by a pair of conveyors that are part of the MT transport means. A retractable or hinged conveyor section can be provided to reduce the dimensions of the support structure 3, for example with a 3p support leg provided to support this retractable section which can form the bag B1, B2 depositing area at the rear / opposite of the trailer link (front link to allow the device 1 to be towed by a vehicle).

[0046] Referring to Figures 1 and 6, device 1 has two controlled supply lines: one for the controlled supply of moistened binder 63 with an initial supply of dry binder 61, and the other for the controlled supply of plant aggregate 62 using a blower or similar pneumatic drive system to transport this plant aggregate after it has been dosed. A junction J is provided, which can be located in the projection section, for example in the form of a lance or nozzle as in the case of Figure 6. Long flexible hoses (several meters long, for example, to allow the operator to move away from the support structure 3) can form conduits, with the first conduit C1 carrying the moistened binder 63, and the second conduit C2 carrying the plant aggregate 62 propelled by an ultrasonic blower unit to which this second conduit C2 is connected.

[0047] In practical implementation examples, such as those shown in Figures 1 to 3, device 1 allows for the opening and / or cutting of bags without human assistance after the closed bag(s) have been deposited, at least for one of the conveyors of the MT transport system. In the case shown in Figure 1, bags B1 and B2 are opened during travel on a conveyor track, for example, using circular blades set in motion around an axis. (typically a horizontal axis). Optionally, the conveyors are equipped with at least three or four circular blades each, allowing the respective bags to be opened by cutting the packages lengthwise (along the path of the conveyor). Bags B1 and B2 can be deposited by the operator in a predetermined orientation, for example, when they are longer than they are wide.

[0048] Bags B1 and B2 continue to be conveyed, at respective stages 93a and 93b (Figure 10), with their contents spilling onto the conveyor belt. Each bag, B1 or B2, can (once opened) be conveyed onto a vibrating assembly VB, for example, a specially designed assembly with two vibrating plates 9a and 9b. The vibrating assembly VB can then facilitate the discharge of the bag contents through the upper opening, which provides access to the interior of the corresponding dosing stage 41 or 42, as shown in particular in Figure 2. As described later, a perforated plate / section 14c or screening section can be provided in the discharge zone Zd1 and Zd2. A step 93a for emptying bags B1, and a step 93b for emptying bags B2, can be carried out without human intervention.

[0049] The first dosing stage 41 may have a dosing screw V1, while the second dosing stage 42 may have a dosing screw V2, for example, arranged parallel to screw V1. The axis A1 of rotation of screw V1 is thus parallel to the axis A2 of rotation of screw V2, with each of the feed hoppers elongated along the same X direction (parallel to these axes A1 and A2). Screws V1 and V2 are, for example, auger screws. The first dosing stage 41 allows the dosing 95a of dry binder by the auger screw V1, which circulates a flow of dry binder 61 to a tank 5. The outlet 41s of the first stage 41 and the outlet 42s of the second stage may be arranged

[0050] Referring to Figures 2 and 3, the first dosing stage 41 has an outlet 41s connected to a mixer (blender) including the tank 5 to allow mixing of this product (typically a powder) with water or a suitable aqueous solution. At least one of the discharge areas, on top of one or both of the hoppers, has a hatch 11a, 11b located opposite the conveyor used to lift and cut the bag B1, B2. In a parallel arrangement of the dosing stages 41, 42, two hatches can be provided side by side, for example, movable by being hinged around a horizontal axis raised above a base surface corresponding to the level of the screen(s) covering the access openings to the dosing stages 41, 42 (screeners of the discharge area).

[0051] More generally, once the bags B1, B2 have been emptied, the device 1 can evacuate the bags without manual intervention, using a bag evacuation equipment T1 equipped with hatches 11 an 11 b or other movable walls giving access to a recovery part, for example arranged transversely or perpendicularly to a general direction of transport of each conveyor of the means of transport MT.

[0052] As illustrated in Figure 3, a hatch 11a can be opened by being hinged on top, optionally with an opening control provided by a cylinder 11c carried by the discharge element or equipment T1. This allows the ejection of the packages / bags into the compactor 30 located, relative to the discharge zone in the first dosing stage 41, on the opposite side of the bag discharge equipment T1. By gravity, the bags B1, B2 are collected in a hollow tubular structure and can, for example, be selectively moved to one side. by a drive element, for example equipped with a rotating screw V3 with a helical structure). A reservoir container or temporary holding container T30, for example shaped like a "sock" with an open / openable bottom, may be provided at the end of the hollow tubular structure of the compactor 30. It is permissible to eject bag or packaging residues onto one side of the support structure 3, with an opening in the container T30 that opens laterally onto one side of this support structure 3.

[0053] Referring to Figure 7A, the compactor 30 can constitute or be part of a bag extraction module. The presence of a container with an upper opening 30a, elongated in a direction transverse to the path of the bags B1, B2 on the discharge zones Zd1, Zd2, allows both types of bags to be accommodated by the same opening 30a. The bag evacuation equipment T1, here with two movable gates, is interposed between each discharge zone Zd1, Zd2 and the upper opening 30a, configured to temporarily block a bag passage (a passage leading above the upper opening 30a and closed by a gate 11a, 11b in the extended position of the cylinder 11c which allows the movement of this gate). The arrangement of the 11c cylinders is adapted so as not to hinder / interfere with the evacuation of bags, for example by mounting each fixed part of the 11c cylinder above the corresponding passage delimited by the equipment T1.

[0054] The extraction module may include a sleeve 36, in the form of a removable sheath or sock. This sleeve 36 constitutes a consumable, to be discarded when its internal volume is filled / sufficiently filled with emptied bags. This consumable may be attached to the tube of the container T30, which here belongs to a fixed and reusable part of the extraction module.

[0055] The extraction module, with or without a compactor function, may have a transverse channel (elongated along the transverse Y direction), delimited between two parallel walls, forming a front wall and a rear wall. The rear upper edge 33, formed on the rear wall, delimits the upper opening 30a on the side opposite the discharge zones Zd1 and Zd2. Above the front wall, the device / machine 1 may include a barrier forming all or part of the discharge equipment T1, here in the form of a barrier provided with two movable / hinged gates in the non-limiting example of Figures 5A to 6B. The upper edge 31 of the equipment T1 may be fixed and parallel to the edge 33.

[0056] Figure 10 illustrates that compaction 94c (or other form of bag removal) can be accompanied or preceded by a counting of bags B1 and / or B2. The counting can be carried out on bags during transport. Alternatively or in addition, a counting can be carried out on bags emptied and processed by equipment T1. As in the case of Figure 5A, the extraction module may have a motorized screw V3 (for example, motorized on the opposite side to the outlet of the T30 container), which includes propellers 32 allowing the empty bags to be moved towards a bottom and to one side, following a trajectory which brings the bags closer to a temporary tube or T30 container, which can carry the envelope 36. Example of a method for controlling operating phases

[0057] With reference to Figure 8, in order to allow for a supply that minimizes operator intervention(s), typically with control capabilities and without manual handling of unpacking bags loaded in the 4t drop-off areas (possibly separated by a partition C3), the device or machine 1 may include two feeding lines equipped with cutting elements 16a, 16b for slitting bags, several transport sections 10a, 10b form part of this first feed line. A configuration with a section 10a that can be folded down using an Xa axis or articulation hinge can be provided.

[0058] Figure 8 illustrates non-exhaustive examples of sections 10a, 10b, for example: - a first section 10a (optional or which can be added in a detachable way, in certain variants) which can form the 4t drop zone where the operator drops the filled and still closed bag, to avoid the emission of dust at the level of this first section 10a; - a second section or main section 10b which extends to an end E adjacent to the discharge zone of the contents of the bag(s) moved on this main section 10b; and - a terminal section where the corresponding spillway zone Zd1 or Zd2 is formed, as seen for example in figure 7A.

[0059] Machine 1 has a perforated or meshed section 14c, possibly present in each discharge zone Zd1 or Zd2. In each feed line, this perforated or meshed section 14c is positioned above a hopper that is part of the dosing stage 41, 42, which receives the contents of the notched and emptied bags. The solid component, which is the dry binder 61 (powdered or granular) or the granules 62, can pass through this perforated section and falls by gravity into the hopper via the access opening of this dosing stage. Even when notched, the bags are large enough to be conveyed along a path to the bottom of the discharge zone, where a hatch 11a or 11b (Figure 2) extends, belonging to a bag discharge unit T1, described below.Of course, any suitable localized cutting process, which does not alter the dimensions of the bag very much, can be used to allow the bag to open by the cuts, typically without loss of bag shreds / pieces that could fall with the contents into the hoppers below.

[0060] Regardless of whether or not it facilitates the emptying of solid raw materials into hoppers, as in the case with automatic bag cutting B1, B2, the preparation process allows for two parallel dosings of the plant aggregate 62 and the moistened binder 63 obtained in a tank (forming a mixing tank or mixer), typically in an uninterrupted process to ensure continuous projection. More specifically, as illustrated for example in Figure 10, the process is carried out using: - an interface of the machine / device 1 for input 91 of parameters (with parameter values ​​which can be pre-programmed from the start), knowing that there is also provided for example a remote control allowing a start 92 of the process as well as a stop step 98 (to cut off the supply of solid components and the sending of these components into the pipes / conduits C1, C2); - a parameter detection set, arranged at one or more locations of the machine 1, in order to be able to carry out control steps 91a, for example to check consistency with input parameters (which may involve checking operation within ranges of values ​​of the measured / detected parameters), and optionally to allow a step 91b of recording parameters representative of the quantities, speeds or flow rates delivered for the products, here the two components 62 and 63 of the mixture. The use of a mixing tank 5 can help to consolidate the measurements and / or ensure that the water content in the moistened binder remains within a desired range.

[0061] In this type of process, a control unit 120 is fitted to machine 1, controlling drive components (worm gear rotation) and one or more pumps and a set of valves V. More broadly, a control unit 120 can: - carry out a first dosage 95a in the first dosing stage 41, and thus provide a first flow rate of dry binder 61, ; - carry out a second dosing 95b in the second dosing stage 42, and thus provide a second flow rate of plant aggregate 62); - receive, in the tank 5 equipped with an agitator equipment 6, water and the dry binder 61 supplied at an outlet of the first dosing stage 41, to allow the moistened binder 63 to be pumped from an outlet 07 of the tank 5. Several control steps are performed by the control unit in order to: - optionally control the MT transport means that supply the dry binder 61 and the plant aggregate 62, with for example the possibility of accelerating or slowing down a conveyor of these transport means and / or signaling a need for supply in one and / or the other of the 4t drop-off areas; - control the first dosage and control the second dosage, for example by ordering the first dosage on the basis of pre-programmed parameter values ​​including a parameter representative of a flow rate in relation to the dry binder (flow of a material including the dry binder), this flow rate being to be delivered upstream of the projection lance.

[0062] A sensor interaction step 91a is used to provide parameters / parameter values ​​measured during operation, i.e., during the preliminary phase of preparing the moistened binder 63, which precedes spraying, and during spraying. With such a process, the respective flow rates, preferably mass flow rates, of the plant aggregate 62 and the moistened binder 63 to be delivered to the spraying lance 8 are set, using the control unit 120, according to the pre-programmed parameter values ​​(typically in step 91) and parameter values ​​that are detected (in step 91a) by the detection assembly. Figure 10 mentions, in a non-limiting manner, in step 91a of interaction with the sensors, the possibilities of monitoring parameters reflecting: the level of the hoppers of the dosing stages 41, 42, the number of bags being transported, by the MT means of transport, to one and the other of the dosing stages 41, 42, the determination that one or more filling level thresholds of the tank 5 are reached.

[0063] Optionally, each conveying stage 93a, 93b respectively for the dry binder 61 (lime or similar) and the aggregate 62 (possibly hemp) can be adjusted with regard to the information / data from the sensors mounted on the feed lines and / or integrated into the hoppers of the dosing stages 41, 42 and / or the bag counting information which has been retrieved by the control unit 120. To ensure control of phase / step 96 of mixing the dry binder 61 with water, the device / machine 1 may have one or more sensors providing an indication / information that a The fill level is reached or exceeded, and / or information indicating an insufficient fill level is displayed in tank 5. Referring to Figure 3, one or more fill thresholds (hs) can be set, typically to allow the resumption of dry binder 61 supply when it is determined that the actual fill level (measured in real time) has fallen below the reference hs threshold. This is compatible with continuous application, carried out as long as the dosing rates are maintained.

[0064] In the example of Figures 3, 4 and 5, a sensor means C5 with one or more probes 50 is shown for detecting one or more fill levels of the tank 5. This sensor means is offset / moved radially outwards from an axis of rotation of the agitator shaft 60, for example by being located near or adjacent to an outer edge of the lid or upper wall element 5d of the tank 5. More generally, any sensor assembly(ies) can be provided with a position offset laterally (outwards) relative to the position of propellers or agitators carried by the shaft 60. The machine can be instrumented by having various sensors. The machine 1 can include, in the control unit 120, a control means CM capable of controlling at least one of the following: an output flow from the tank 5 of moistened binder 63, the flow of plant granulate 62 and the determined flow of dry binder 61 obtained at the outlet 41s, as a function of information representative of the filling level of the tank 5, and preferably also as a function of a projection flow command entered (optionally) by a human-machine interface.

[0065] Figure 5A schematically illustrates, with a connection L5, the possibility of connecting the sensor or sensor assembly C5 equipping the tank 5 to a control and automation unit, forming the control unit 120 and including the aforementioned control means CM, which can control flow rates or material movements. This unit 120 typically has a set of valves V and / or can activate components of the device to restart or increase the supply of materials used in the spray mixture (formed by coated particles 15) or, conversely, to slow down or stop one or both of the feed lines, at least in a section thereof. This can also apply to the water supply, which is provided, for example, using a fitting RC1 with a valve, in the non-limiting case shown in Figure 4.In general, any water inlet with a solenoid valve or other type of valve can also be controlled using unit 120. Optionally, the water inlet can be fitted with a regulating valve and / or a flow meter, which can allow control of the flow of water or aqueous solution entering tank 5. A V10 valve can be coupled to a water inlet pipe via the RC1 fitting.

[0066] The control unit 120 can also be linked to sensors on the hoppers of the dosing stages 41 and 42, for example, to control the MT conveyors based on the fill level in the hoppers of these respective stages 41 and 42. The L5 link can be used so that the CM control unit restarts the conveyor that moves the dry binder 41, thus improving / increasing the fill level of the dosing stage 41, the output flow rate of which can then be increased. This L5 link can also be used in the opposite situation where the supply of dry binder 61 is adequate or already high compared to the supply of aggregate 62, for example, by stopping the aggregate 62 feed conveyor and delaying the dosing stage 42.

[0067] Upstream of tank 5, it is possible (as shown, for example, in Figures 5A and 10) to restart / start the MT conveying system, for example, by starting a conveyor when the level in the hopper for dry binder 61 is low. A bag B1 can then be lifted and unloaded to provide a sufficient flow rate of dry binder, which is optionally maintained at a predetermined level at the outlet 41s of the first dosing stage 41. Similarly, it is also possible to start another conveyor associated with the second dosing stage 42 when the level in the hopper for plant aggregate 62 is low. A bag B2 of plant aggregate 62 can then be lifted and unloaded to provide a sufficient flow rate of plant aggregate 62, which is optionally maintained at a predetermined level at the outlet 42s of the second dosing stage 42.The US blower unit is coupled to a flexible hose, possibly with a larger cross-section than another hose used for the moistened binder 62, and forming or connecting to the conduit C2. This allows the aggregate 62 to be sent in an airflow towards junction J, subsequently enabling the projection of the mixture with the aggregate coated by the moistened binder, as described later. This delivery corresponds to a pneumatic conveying 97b.

[0068] In machine / device 1, the MT transport means and each dosing stage 41, 42 may also include: - at least one sensor, for example to detect a low fill level in a hopper; - a bag counting module; - an interface module to alert of an insufficient level, to allow for example to deposit an additional bag in a loading area of ​​MT means of transport; - a link with an input interface that records a projection flow rate command (for example to differentiate between low flow rate operation and high flow rate operation). It is understood that device 1 can operate with relatively high flow rates, for example exceeding 4 to 6 m 3 / h consumption (flow rate) of granulate 62 (for example hemp), and / or which may exceed 1 to 3 m 3 / h of consumption (flow rate) in dry binder 61 (for example lime).

[0069] The series connection of the first part of the MT transport system, dedicated to transporting the dry binder 61, the first dosing stage 41, and the tank 5 with the agitator 6 and pump 7, allows for the creation of an automated supply line to prepare and dispense the flow F5 of moistened binder into the supply pipe or conduit C1, which connects to the junction J, provided here, for example, on the nozzle 8. Figure 3 shows, with three arrows, the path of the dry binder 61, which follows a trajectory with a reversal, insofar as the screw V1 of the first dosing stage 41 can circulate this dry binder 61 in the opposite direction to its supply direction onto the screen or similar discharge zone from above this dosing stage 41. In this non-limiting example, the thicker arrows on the left of Figure 3 show the path of the packaging / bag remnants B1, which may have been cut open.

[0070] The second part of the MT transport system, dedicated to transporting the plant aggregate 62, the second dosing stage 42, and the plant aggregate transfer section 44 located downstream of the second dosing stage 42 (to supply the lance 8 with the accelerated flow of plant aggregate 62), can also be automated, using sensors, to form a plant aggregate 62 supply line. For this second supply line (for hemp or any suitable lightweight aggregate 62), the machine or device 1 can offer the operator input, for example, on a screen. tactile, of the type of plant granulate and of a length of the blow pipe, forming a long conduit C2 up to the lance 8, put in place for example on an outlet 42s of the second dosing stage 42. Advantageously, a compactor 30 or other equipment for the treatment of the remains of bags B1, B2, can be common to the two dosing stages 41, 42, so that the compactor 30 illustrated in figure 3 for collecting the bags B1 can also collect the bags B2 which return to the temporary reception area of ​​the container T30, as can be understood from figure 1. Example of integrating a tank with an agitator into the device

[0071] As can be seen in particular in Figure 3, the tank 5 has a bottom 5a and includes a side wall 5b that extends vertically from the bottom 5a to an upper wall element 5c, forming a lid. The tank 5 can support an agitator 6 to form a mixer. A motor M5 can be mounted directly on the top of the tank 5 for top-driving an agitator rod or shaft 60. Generally, the agitator 6 includes at least one vertical agitator shaft 60, coupled to the tank 5 to continuously mix the water with the dry binder 61 in a closed volume V5 of the tank 5. The agitator shaft 60 can be arranged vertically, either coinciding with or close to a central axis of the tank 5. The lid 5c, which may include a movable part 5d, closes off access from above to the closed volume V5. A vent or valve may be provided on the lid for ventilation. A movable element 5d can be part of the lid or upper wall element 5c, with for example a handle 55 as in the case illustrated in figure 4. This movable element 5d is here mounted articulated on a hinge CH and can be offset to one side to be accessible from an outside side of the support structure 3. The movable element 5d is for example complementary to a fixed horizontal part carrying the drive means 6d used to operate the rotation of the vertical stirring shaft 60.

[0072] Tank 5 is wider than it is tall in the example of Figures 3 and 4. More generally, tank 5 has a format adapted to obtain homogeneous agitation, for example by presenting a side wall 5b which has a continuous curvature over at least two angular sectors each representing more than 100°. Tank 5 is part of a feed line parallel to the plant / light aggregate feed line or channel 62. Outlet 42s can be located at the bottom of the second dosing stage 42, at an end far from the MT conveying means, with the possibility of connection to a US blower unit, equipped with an air blower, for example. Tank 5 and the blower unit can be arranged on opposite sides in a right-left direction (lateral direction Y as seen in Figure 3), with tank 5 positioned completely behind outlet 42s and the US blower unit, thus offset towards the MT conveying means along the direction of the X axis shown in Figure 3 (which corresponds to a conveying direction for the delivery of dosing stages 41 and 42 from the same rear side; the X direction can be a longitudinal / elongational direction of structure 3).

[0073] In tank 5, the dry binder inlet 52 can be formed by a downward conduit extending from the first dosing stage 41 to a top opening 05 (Figure 3) of tank 5, which passes through the top cover / wall element 5c, so that tank 5 is below the first dosing stage 41. Tank 5 is adapted to be filled with water before the The discharge of dry binder 61 is carried out according to the dosing flow rate obtained at the outlet 41s of the first dosing stage 41. For this purpose, the tank 5 may include a tap or a water / aqueous liquid supply device, typically mounted on the upper wall element 5c which also includes the opening 05. The discharge of the moistened binder 63 resulting from the mixing / stirring in the volume V5 can be carried out using a pumping section which communicates with a lower filling zone Za of the tank 5. For example, the tank 5 can be traversed by a hollow element, perpendicular to the stirring shaft 60 and forming a motorized rotating shaft connected to a screw conveyor 63 for the discharge of the moistened binder. A jacket can form a conduit for the pump 7, used to adjust the outgoing flow rate of the moistened binder 63, thus allowing the conveyance 97a of the moistened binder 63 towards / to a spray lance 8. The arrow F5 in Figure 3 illustrates the flow of moistened binder F5 entering the flexible pipe forming the conduit C1 or joining such a conduit, which connects to the other conduit C2 via junction J (Figure 6). The pump 7, for example, is an off-center helical rotary screw pump within an internal helical conduit of the tubing or pump body connected to the tank 5 at the lower opening, forming a horizontal outlet 07, clearly visible in Figure 4.

[0074] Regardless of the method of circulating the moistened binder 63 to obtain an outlet flow rate F5 at outlet 07, the pump 7 can be designed to extend horizontally by connecting to this outlet 07, preferably with a rotating element of this pump 7 passing horizontally through the outlet 07. Typically, the flow rate F5 can be adjusted according to the rotational speed of a rotating element (helical screw connected to a shaft) of this pump 7. The motor M7 of this pump 7 can be positioned externally to the tank, on the platform P10 or another area of ​​the structure 3, on a side opposite the body of the pump 7, so that the tank 5 is traversed (horizontally) by a shaft extending between a first external end (outside the tank) connected to the motor M7 and a second end which connects, for example, through the opening or outlet 07, to the drive screw. housed in the body of the pump.As can be seen in particular in Figure 3, the pump 7 has, outside the tank 5, a termination fitting (for example formed as a male termination / fitting on the pump body), for attaching a flexible connecting hose separate from the pneumatic conveying path.

[0075] The base 5a can rest directly or indirectly on the platform P10 of the support structure 3. The tank 5 can be partially offset on one side of the structure 3, which is optionally on the opposite side from the outlet of the container T30, here tubular. More generally, the tank 5 can be located, on the support structure 3, on the same side as the controlled supply line that receives the bags B1 of dry binder 61. As shown in Figures 1, 3, and 4, the mixer tank 5 is a preparation tank for the moistened binder 63, which includes an inlet 51 for water or aqueous solution and an inlet 52 for dry binder that is connected to the first dosing stage 41. This inlet 52 may correspond to the termination point of a screw (Archimedes screw), given that a gap may be provided between a terminal helix of this screw V1 (bottom screw located at the bottom of the hopper) and a bearing supporting one end of the shaft of this screw V1. The inlet 52 may include the opening 05 located under the terminal section of this shaft, between the terminal helix 12 and the bearing P1. Example of automated operation

[0076] Upstream of the tank, device 1 can discharge solid materials, using the MT conveying means, into the first dosing stage 41 and the second dosing stage 42 respectively: no liquid is required in these stages 41 and 42. Conversely, tank 5 is filled with aqueous liquid / water, possibly as soon as operations start. Tank 5 has a lower, first filling zone Za, where an agitator element (lower propeller in the example of Figure 4) of the agitator equipment 6 extends. The liquid can thus be set in motion, for example by forming a central vortex, when the solid dry binder 62 is poured (typically in powder form) from the top (via an opening in the lid 5c) to join the liquid and mix with the water. The tiered arrangement of several stirring elements 6a, 6b can optimize the dispersion rate of dry binder particles in water.In the case of a binder in the form of lime, a lime slurry is obtained.

[0077] Preferably, the water filling via inlet 51 occurs until a threshold is reached or exceeded, which may, for example, exceed at least one of the agitators 6a, 6b, or optionally exceed the highest of the agitators 6a, 6b after the addition of the dry binder. Such a threshold allows the liquid / water to rapidly fill the second filling zone Zb, located above the first filling zone Za. Optionally, a first agitator 6a is located in zone Za, submerged, and a second agitator 6b (attached to the same shaft 60) is located in zone Zb, also submerged. The agitator 6 can be fitted with two agitator blades 6a, 6b, each mounted by a central hub connecting to the shaft 60, with angled portions for uniformly mixing the materials, including the dry binder 61. In the option shown in Figure 5b, the first agitator 6a, typically positioned higher, can be fitted with passage holes 25, for example, distributed in each blade of the propeller. Three passage holes 25 are, for example, arranged in a triangular pattern for each blade. Vortices / turbulence can be generated or enhanced with such passage holes 25. In a mixing process, these propeller portions / blades beat the dry binder 61 to pulverize it, preventing or minimizing agglomeration, which effectively improves the effect and efficiency of the mixing.Furthermore, a toothed edge 26a, 26b (leading edge) is provided respectively in the propeller / blade portions of the agitator elements 6a, 6b. All or part of the blades may have a non-flat profile, with an angle at the junction to form a concave surface on the side of the intercalated zone Zs between the agitator element 6b and the agitator element 6a. A straight junction 29 with radial extension can thus connect the blade halves, forming an edge in each dorsal face of the blades (this dorsal face being the face axially opposite the intercalated zone Zs). The direction of rotation can be chosen so that the portions with the holes 25 are behind the portions with leading edges formed by the toothed edges 26a, 26b, for example here with a substantially wavy shape to form at least seven or eight protruding teeth.

[0078] A separate count of the torn / cut bags can be performed by a counting unit, in order to account for the quantity of solid material discharged into the hoppers via the discharge zone onto the screener (with vibrating plates 9a, 9b). A dosage of the dry binder 61 and a dosage of the lightweight aggregate 62 are carried out, with the tank 5 being filled by the addition of the dry binder 61, which is then stirred with water. The sensor unit C5 (forming or belonging to the detection assembly) can include a high level sensor - for example higher than the upper propeller or agitator 6b, and a low level sensor (located lower than this agitator 6b), which provides fill level data that can complement recording data relating to the quantities of solids poured into the dosing stages 41, 42, possibly with data on the quantity or flow rate of water poured via the inlet 51.

[0079] To enable projection, device 1 uses the following simultaneously: - the US blower unit with the transfer section 44, for example made in the form of a lock, to carry out conveying via pipe / duct C2, - and the pump 7, typically connected to the tank 5 at the level of the filling zone Za, to carry out a conveyance by pipe / conduit C1, preferably with the use of a flow meter for the control of the flow F5. The connection of conduits C1 and C2 with junction J allows for the production of the moistened binder-plant aggregate mixture. The dry binder 61 has a mineral component, such as lime or a similar air-bound binder. Alternatively, clay or a primarily hydraulic binder (e.g., quick-setting cement) can be used. The plant aggregate 62 is typically organic but may also include a mineral component (e.g., expanded clay or pumice). It is understood that the dry binder 61 contains primarily one or more compounds including an alkaline earth element. The moistening of this dry binder 61 can be considered complete, thanks to the use of the instrumented tank 5.

[0080] With reference to Figure 6, partial or total coating of the plant aggregate particles 62 is achieved from the connection / junction J, and throughout the transfer of the lightweight concrete / final mix through a conduit 80b or nozzle, as well as outside the conduit 80 to the surface onto which the product is applied. The transfer conduit 80b may be cylindrical or optionally have a restricted cross-section. Without limitation, the transfer conduit 80b may be portable and allows for the projection of the forming product consisting of the coated particles 15 and the moistened binder 63. The opening formed at the outlet end 80c of the conduit 80b is preferably sufficiently large to prevent premature agglomeration between the coated particles 15. The cross-sectional area of ​​the outlet 80c preferably exceeds 20 cm². 2 and may optionally be less than the section planned at junction J.

[0081] In one embodiment, the connection J can be formed on the side of a first conduit C1 for transporting the moistened binder 63. This is a simple connection J located near the outlet 80c of the conduit 80, for example, at a distance d less than or equal to one meter. The second conduit C2 can be inclined at an acute angle to a central axis D8 defined by the first conduit C1 near the connection J. This central axis D8 corresponds to an injection axis for the moistened binder 63 conveyed by the first conduit C1 (which may include a portion of the flexible hose for delivering the moistened binder) and can be considered a central axis defined at the outlet 80c of the conduit 80. Of course, the connection of the two conduits C1 and C2 can be made in various forms, and the case shown in Figure 6 is not limiting to the type of junction formed near the outlet 80c. An 80a fitting, for example male, can allow the flexible hose forming the conduit C1 to be connected to a rigid connection fitting provided on the lance 8.

[0082] A final projection step 98a (Figure 10) can be performed to complete the projection permitted by the process, immediately after the stop 98 command issued by the operator (preferably via an interface provided on the projection lance 8). For example, when solid materials no longer flow from pipes / conduits C1 and C2 in response to the stop 98, the control unit 120, which receives this stop command, can then initiate a routine to complete the projection without leaving any aggregate in conduit C2. Thus, the control unit 120 can shift successive commands as follows: - the stoppage of the circulation of the plant aggregate is immediately ordered, initially, by maintaining an air circulation using the US blower unit up to the projection lance 8; - by taking into account the length of the pipe / conduit C1, a staggered (slightly later) stop of the pump 7 provided at the outlet of the tank 5, this stop taking place in a second stage corresponding to the complete absence of supply of the projection lance 8 with plant granule 62; - the shutdown of the US wind tunnel unit. Cleaning

[0083] With reference to Figures 3, 5, and 10, tank 5 can be cleaned when a cleaning cycle is activated. This cleaning cycle can consist of / be broken down into a group of steps. The machine 1 can include a control cabinet or interface that signals a need for cleaning of tank 5, for example, when a spraying cycle is completed (with a voluntary stop) or when a pause in operation has exceeded a threshold. The control unit 120 has a switching control interface (MV) to switch from a tank filling mode to a tank cleaning mode. The switching control interface (MV) is linked to one or more valves (V10, V20) of a set of valves (V), which allows the unit 120 to initiate a cleaning cycle or mode for tank 5.In parallel with the water inlet 51, the tank 5 may have cleaning means T, RC2, 90 for spraying a liquid directed onto the shaft 60 with its agitator(s) 6a, 6b, for example, with one or more downward-directed water jets. The spraying may be carried out from the top of the tank 5, from a connection RC2 which may be linked to a reservoir T or a water supply source, via a supply line VN which may provide pressurized water, towards a spray nozzle 90. The spray nozzle, for example, supported by the lid or upper wall element 5c of the tank 5, may protrude downwards into the closed volume V5, in a closed configuration of the tank 5.

[0084] During a cleaning cycle, the tank 5 can be in an open configuration with a lower access point to allow the rinsed material to be discharged with the cleaning fluid. For this purpose, the tank 5 may, for example, have a lower drain port 09, provided in a bottom 5a, below a rotating shaft of the pump 7 and / or below the agitator 6a carried by the shaft 60. To allow selective opening of the port 09 or a conduit underlying this port 09, the tank 5 may include a lower tubular conduit that supports a valve 9 or a mechanism with a flap or shutter, selectively allowing drainage through the port 09. A mechanism for moving the shutter, typically in the form of a valve 9, may be carried by the tank 5, for example, at the level of this lower tubular conduit that allows drainage / discharge during cleaning. It can be advantageous to position each stirring element 6a, 6b axially between the base 5a and the spray nozzle 90, intersecting one or more downward jets propelled by the spray nozzle 90. A substantially vertically aligned arrangement of two elements 6a, 6b and the nozzle 90 can be provided. Water consumption during cleaning can be reduced.

[0085] Referring to Figure 10, a cleaning cycle can thus correspond to one or more steps 99 which can be performed sequentially, typically without operator intervention. In response to an alert signal / display or a signal / display indicating a need for cleaning, the operator can initiate the cleaning cycle, so that the control unit 120 (control and automation unit) transmits a command to stop all supply of solid material / binder 61 through the opening 05 and to shut off the inlet 51 (via the RC1 fitting in the case of Figure 4). Water is then sent through the spray / wash nozzle 90 to clean the tank 5. The valve 9, which serves as a drain / sewer valve, opens to discharge the wash water. A rinsing phase can be implemented and / or the cleaning is completed by starting pump 7 so that the cleaning extends to pipe / conduit C1 for the moistened binder 63.

[0086] In certain options, for implementing cleaning or for delaying the power supply during projection (for example, when approaching the end of a projection cycle), the MC control means can activate: - a stop of the first dosing stage 41 and / or of a first part of conveying supplying this first dosing stage 41, in order to stop the determined flow of dry binder 61; - and a stop of the second dosing stage 42 and / or of a second conveying part feeding the second dosing stage 41 in order to stop the flow of plant granulate 62.

[0087] In an active mode of the mixer including tank 5, the MC control means provided in unit 120 can be coupled to the MV interface to maintain: - a first valve element V10 in an open state to allow water to be supplied to tank 5 with an adjustable flow rate, - a second closed valve element V20, so that it blocks a cleaning path VN which can be in fluidic connection with the closed volume V5. Alternatively, in another mode corresponding to the cleaning of tank 5, this control means MC modifies the configuration of device 1 so that: the first valve element V10 is closed, while the second valve element V20 is open to allow the flow of a cleaning liquid (via the spray nozzle 90). In this latter case, the control means MC can previously initiate the shutdown phase of the first dosing stage 41 and the second dosing stage 42.

[0088] These arrangements minimize the monitoring tasks for the operator(s). Optionally, several bags B1, B2 can be unloaded into a pair of loading areas. From such a loading area, forming one end of the MT transport system (rear end, opposite the dosing stages 41, 42): the dry binder 61 can be transported and poured without human intervention, on the one hand, and the plant-based aggregate 62 can be transported and poured without human intervention, on the other. Mixing in the tank 5 can thus be achieved in a preparation phase that requires only the effort of depositing bags B1, B2 into a The lower part of device 1 is typically located lower than the top access to the respective hoppers of dosing stages 41 and 42. The sensor(s) indicate when the tank fill level falls below a threshold hs, which may mean that the preparation phase is not yet complete. Therefore, the operator enters the control parameters for the preparation / spraying process and can wait for further information before starting the spraying, which can then be continuous.

[0089] Advantageously, a process implemented with the machine / device 1, instrumented by the detection system (including the sensors), allows for monitoring compliance with the initially entered parameter settings, while also permitting—particularly during a pre-spraying preparation phase and in the final spraying cycle—the separation of material flows. Targeted cleaning can also be initiated, for example, with cleaning applied selectively to the tank, while airflow management allows for emptying the C2 duct / pipe for aggregate 62. Dimensional parameters of the machine and / or at least one C1, C2 duct can improve the final spraying cycle, making the machine and its components easier to maintain.

[0090] In device 1, as shown in Figure 2, the first dosing stage 41 can have a height H1 greater than 50 or 60 cm and can be smaller or narrower than the second dosing stage 42, for example, by being less wide and shorter (smaller vertical dimension). The height of the second dosing stage 42 can be greater than or equal to 90 or 100 cm. The ratio H1:H2 can be less than 0.75, possibly less than or equal to 0.6. This can facilitate the integration of the tank 5 below the first dosing stage 41. Screeners for these two dosing stages 41, 42 can however be located at the same height level, at the same distance from a horizontal bottom or platform P10 provided on the support structure 3. The length of the platform P10 can remain less than 5 meters, for example on the order of 4 meters or less in no way limiting.

[0091] The screeners can form two parallel screening zones separated by a central projection SP1, SP2, projecting upwards from a floor level of the screeners. A front portion of each projection SP1, SP2 can be beveled. Each projection SP1, SP2 is capable of deforming and typically penetrating the mass of solid component still contained in the corresponding bag B1, B2, which has already been cut, for example, notched on the sides by cutting means such as the cutting elements 16a, 16b illustrated in Figure 8. The central downward penetration into each bag B1, B2 prevents accumulation at the bottom of the bag by locally counteracting the convex curvature of the bag's bottom under the effect of gravity.

[0092] The central projection SP1 for the B1 hemp bags, on the left in the non-limiting case of Figure 7B, may optionally be narrower and higher than the central projection SP2, which is inserted into the B2 bags of dry binder (lime or similar). Each projection has the effect of accentuating the discharge of material to the left and right (on either side of this projection), typically with a roughly equal distribution on each side, provided that the bag is centered and not subject to a tipping effect during its travel on the conveyor(s) 4 of the MT transport equipment. The discharge therefore occurs on notched sides, thus facilitating release by gravity. The solid components can then, through a screening effect, traversing the areas of the perforated plate. In some options, such a projection SP1, SP2 can be made movable.

[0093] This arrangement with a central projection SP1, SP2 is applicable to either or both of the solid components. In the non-limiting example of Figure 7B, the SP1, SP2 projection has a separating effect, splitting the discharge flow in two. The SP1, SP2 projection can have two oblique flanks DF, creating a deflection effect towards the outside, with a progressively increasing downward spacing between the opposing surfaces of the SP1, SP2 projection (i.e., as one approaches a bottom formed by a grid / perforated section). Each SP1, SP2 projection thus has a deflection effect, discharging the solid components on either side of the projection into the two screening zones that are part of the same discharge zone Zd1 or Zd2.14g deflectors can also be provided under the perforated plate, in order to reduce the passage cross-section if necessary so as not to spill a solid component outside the respective dosing stage 41 or 42 placed below the screening part with two zones separated by a projection SP1 or SP2.

[0094] Screeners can be made up of rows of M modules, for example, each of the type shown in Figure 7B (with each M module overlapping the two dosing stages 41 and 42 from above). More generally, a two-part screening plant using such M modules can be designed to facilitate the high-quality supply of solid components, promoting automation with dosing controls in stages 41 and 42. In some options, one or more of the M modules support a set of vibrating plates and / or elements for generating vibrations in the screens, which can be part of a common perforated plate (single plate) of the M module.

[0095] This disclosure is not limited to the embodiments described above, only by way of example, but encompasses all the variations that a person skilled in the art may consider in the context of the protection sought. For example, various methods can be used to estimate one or more fill levels, using a sensor. Furthermore, the type of lance 8 shown in Figure 6 is not limiting, as the junction J can be arranged differently. If necessary, additional inlets can be provided on the lance, for example, to add an additive flow and / or additional water or binder. Any suitable portable spraying equipment can be used by connecting to the two parallel supply lines of the device 1, respectively for plant-based granules 62 and moistened binder 63.

[0096] Furthermore, conveyor assemblies 4, of the type with transport belts b, having inclined planes 14a, 14b, are shown, each equipped with a bag opening function, with cutting elements 16a, 16b as in the case of Figure 8, for example. Such a function is optional here and / or may only apply to one of the conveyor assemblies. The parallel arrangement (with a small gap e4 in Figure 8) has been given only as an illustration for the implementation of the process, here using a machine 1 or device reducing the footprint. Other structures or arrangements may, of course, be suitable.

Claims

Demands

1. A method for preparing a sprayable mixture by carrying out two separate, parallel dosings of a vegetable granule (62) and a moistened binder (63) obtained in a mixing tank (5), wherein the method is carried out by means of a mixture preparation machine (1) designed and arranged to connect to a mixture spraying lance (8), the method comprising the steps of: - use a control unit (120) connected to a parameter detection set arranged at one or more locations on the machine (1); - carry out a first dosage (95a) to enable the provision of a first flow rate of dry binder (61), the first dosage (95a) being carried out in a first dosing stage (41); - carry out a second dosing (95b) to enable a second flow rate of plant aggregate (62) to be provided, the second dosing (95b) being carried out in a second dosing stage (42) operating by dry process; - to receive, in said tank (5) equipped with an agitator (6), water and the dry binder (61) supplied at an outlet of the first dosing stage (41), to allow the moistened binder (63) to be pumped from an outlet of the tank (5); wherein several control steps are carried out by the control unit (120) in order to: - control the first dosing and control the second dosing, by ordering the first dosing (95a) on the basis of pre-programmed parameter values ​​including a parameter representative of a flow rate of a material including the dry binder (61), this flow rate being to be supplied upstream of the projection lance (8); and in which respective flow rates, preferably mass flow rates, of the plant aggregate (62) and of the moistened binder (63) to be conveyed to the projection lance (8) are set, using the control unit (120), according to the pre-programmed parameter values ​​and parameter values ​​detected by said detection assembly.

2. Method according to claim 1, comprising a detection (91a), by the detection assembly, of at least one parameter representative of a filling level in the first dosing stage (41) and / or in the tank (5).

3. A method according to claim 1 or 2, wherein the control steps include a control of a transport of the dry binder (61), which is preferably fed into the machine (1) in a conditioned state in bags (B1), the transport control being a function of a value representative of a flow rate of dry binder (61) or moistened binder (63), selected as a value from several pre-programmed values ​​available using a human-machine interface connected to or forming part of the control unit (120).

4. A method according to claim 3, wherein a communication step, via an interface connected to the control unit (120), is carried out to provide quantitative indications representative of a number of bags (B1) of dry binder (61) and a number of bags (B2) of plant aggregate (62) deposited on two depositing zones (4t) provided on the machine (1), and wherein the transport of the dry binder (61) is carried out automatically from the bags (B1) containing the dry binder (61), using cutting and / or emptying means provided on transport means (MT) to separate the dry binder (51) from the walls of the bags (B1).

5. A method according to any one of the preceding claims, comprising a step (91b) of recording parameter values ​​provided using sensors belonging to the sensing assembly, these values ​​being representative: - the flow rate of dry binder at an inlet of the tank (5) or of moistened binder at the outlet of the tank (5); and - of a flow rate of the plant aggregate (62) at the outlet of the second dosing stage (42).

6. A method according to any one of the preceding claims, comprising one or more transport stages (93a, 93b), by transport means (MT) of the machine comprising a first feed line and a second feed line arranged in parallel, of bags (B1, B2) respectively filled with dry binder (61) and plant granulate (62), up to a discharge section which includes: - a first discharge zone (Zd1) provided on one end of the first feed line, for the discharge of the dry binder (61) towards the first dosing stage (41); and - a second discharge zone (Zd2) provided on one end of the second feed line, for discharging the plant aggregate (62) towards the second dosing stage (42), in which programming (91) of the composition of the mixture to be sprayed is carried out to allow a composition parameter to be included in the pre-programmed parameter values, and in which at least one transport on one of the two lines during the transport stage(s) (93a, 93b) and at least one of the first dosing (95a) and the second dosing (95b) are controlled by the control unit (120) in order to adjust: - a supply level for each of the first dosing stage (41) and the second dosing stage (42); and - an output flow rate for each of the first dosing stage (41) and the second dosing stage (42).

7. A method according to any one of the preceding claims, comprising communication between at least one sensor (C5) equipping the tank (5) and the control unit (120), said communication enabling the control unit (120) to modify, as a function of a filling level in the tank (5), a feeding parameter of one and / or the other of the dosing stages (41, 42), automatically.

8. A method according to any one of the preceding claims, wherein the dry binder (61) is lime which is poured into a hopper of the first dosing stage (41), a closed circulation channel for the lime being provided between an outlet of the hopper and the spray nozzle (8), a conduit or pipe (C1) allowing the moistened binder (63) exiting the tank (5) to circulate to the spray nozzle (8), the tank (5) being: - equipped with a cover (5c) that provides a barrier against dust; and - designed to delimit an enclosed interior volume (V5) which is part of the enclosed traffic lane.

9. A method according to any one of the preceding claims, wherein the control unit (120) receives a stop command (98) activated by means of an interface provided on the projection lance (8), and wherein a stop step initiated by the stop command comprises: - the cessation of the flow of plant aggregate, which preferably includes hemp, towards the projection lance (8), initially while maintaining air circulation using a blower unit (US) in a pipe or conduit (C2) used for the pneumatic transport of the plant aggregate (62) up to the projection lance (8); - taking into account a length of said pipe or conduit (C2), in order to stop a pump (7) provided at the outlet of the tank (5) in a second step, offset from the first step and which corresponds to the complete absence of supply of the projection lance (8) with plant granule (62).

10. A method according to any one of the preceding claims, comprising a power supply stop including: - a stop of the first dosing stage (41) and / or of a first part of conveying supplying the first dosing stage (41) in order to stop a determined flow of dry binder (61); - a shutdown of the second dosing stage (42) and / or a second conveyor section feeding the second dosing stage (42) in order to stop the flow of plant-based granules (62); and - control of a set of valves (V) by the control unit (120); given that valve control allows: - during a first mode corresponding to a mixing in the tank (5), to maintain a first valve element (V10) of said assembly (V) open in order to supply water to the tank (5) with a flow rate which is preferably adjustable, while a second valve element (V20) of said valve assembly (V) closes a cleaning path (VN) in fluidic connection with a closed volume (V5) of the tank (5); - during a second mode corresponding to a cleaning of the tank (5), to close the first valve element (V10) of said assembly, while the second valve element (V20) of said valve assembly (V) is open for the flow of a cleaning liquid; an activation of the second mode being carried out by the control unit (120) in a stop phase of the first dosing stage (41) and the second dosing stage (42).

11. A method according to any one of the preceding claims, comprising the use of a sensor in means of transport (MT) to enable counting of bags on a feed line selected from a bag feed line (B1) of dry binder (61) and a bag feed line (B2) of plant granulate (62), and wherein an alert step is carried out to alert of a deficiency, on one of the feed lines or in one of the dosing stages (41, 42), of solid material, in order to inform of the need for the addition of an extra bag in a loading area of ​​the means of transport (MT).

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