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.

Abstract

The process allows for the continuous preparation of a mixture of plant-based aggregate and moistened binder, using two dosing stages (41, 42) supplied in parallel with solid components. The moistened binder is obtained in a mixing tank (5). The preparation is carried out in a machine comprising the two stages, the tank, and a connection to a spray lance, allowing the moistened binder to be pumped from the tank into a pipe (C1) leading to the lance. A control system, using pre-programmed parameter values ​​including at least one flow rate of the dry or moistened binder, is used by a unit (120) to control the dosing performed in the stages. The unit has at least one connection (L5) with detection means (C5) that detect operating parameters at one or more locations on the machine. Traceability is achieved by recording the various parameters. Figure 5

Description

Title of the invention: A traceable method for preparing a sprayable mixture by simultaneously dosing a plant-based aggregate and a moistened binder in a mixing tank. Technical field

[0001] This disclosure relates to installations used to allow the projection of materials, such as lightweight concrete or mortar, in the field of building works. It relates more specifically to a traceable preparation process for a sprayable mixture by simultaneously dosing a 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 the element 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. Several workstations are required, which present difficulties and constraints during the operations necessary to obtain the proper mixture. Operators are exposed to dust, while handling and monitoring require the almost constant presence of three different operators.

[0005] Document FR 2915702 discloses equipment for projecting a mixture of lime and hemp which has 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 remaining dry mixture, including an airlock; - an injection 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. Controlling the distribution of components in the dry mix is ​​difficult without the active presence of operators at the various loading stations, in addition to the operator holding the spray nozzle. Furthermore, installing the equipment is very time-consuming.

[0006] More generally, dry spraying methods, which involve mixing the raw materials in dry form 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, part of the binder may end up 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] The present disclosure improves 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, wherein the process is implemented by means of a mixture preparation machine designed and arranged to connect to a mixture spraying lance, the process comprising the steps of: - 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 the feed lines to be adjusted independently, 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 assembly), for example, to estimate / quantitatively determine the masses dispensed into the dosing stages. The control unit can allow the input of parameters useful for regulating the dispensing into and / or the 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 can enable the continuous preparation of a mixture with plant-based granules and a moistened binder, using two dosing stages supplied in parallel with solid components, preferably with a level of automation and / or a determination of the continuous operating period permitted with 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 condition can be provided / 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 obtained in a mixing tank, which can be fed directly from the first dosing stage, thus allowing the flow of dry binder to the tank to be partitioned / closed. The preparation is carried out in a The machine, possibly mounted on a trailer, includes two stages, a tank, and a connection to a spray lance, allowing the moistened binder from the tank to be pumped through a pipe 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 application rates on 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, by providing a human-machine interface. The preparation process is optimized to allow spraying with minimal human intervention: - the remote control or interface may offer at least the ability to start and stop the spraying, as well as a button or part of an interface for adjusting the flow rate at the lance outlet (at least two speeds can be obtained, for example). - the mixtures can be programmed according to the intended use / target (for example, wall or roof) and the binder / aggregate combinations 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 possibility of real-time control of important parameters concerning the preparation and / or distribution of the moistened binder: not only is the dry binder flow rate configurable by controlling the first dosing stage coupled to the tank, but the actual flow rates before the connection are advantageously controllable, for example in a coordinated manner, by using the sensor(s) provided in the tank. This eliminates the need for an operator to monitor the 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 points (downstream in the direction of flow of the 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 can present a first lower filling zone, where an agitator element of the agitator equipment extends and a second filling zone located above the first filling zone, knowing that the threshold is for example set to represent a height level which is higher than the first filling zone (first zone where the tank outlet can 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 granules (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 device, the first dosing stage may be smaller or narrower than the second dosing stage, for example, by being less wide and shorter (smaller vertical dimension). Screeners for these two stages may, however, be located at the same height (the second dosing stage may have a deeper hopper than the hopper of 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 method includes detection, by the detection assembly, of at least one parameter representative of a fill level in the first dosing stage and / or in the tank. Alternatively or in addition, detection is performed by the detection assembly 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 ordering the 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 depositing area and arranged to allow the depositing of at least one bag, with a conveyor assembly that moves a deposited bag and allows the bag to continue transporting it out of the depositing area. - the conveyor assembly (which belongs to the means of transport) is capable of transporting each bag deposited to a discharge zone which may be located above / in line with 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 method 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 makes it possible, for example, to differentiate between low-flow and high-flow operation, with the possibility of directly choosing between one of these two flow rates. As an option, at least three flow rates can be chosen from a selection of pre-programmed flow rates.

[0019] According to one 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. - 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 able to be controlled 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 and second dosing stages. 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 projection lance. This allows for two final conveying pipes: one of the pipes connects to a jacket or pump defining the flow rate of moistened binder, while the other of the pipes is in communication with / connected to a sluice gate or similar outlet supplying the plant granulate stream, typically mixed with compressed air blown by a blower unit.

[0022] According to one particular feature, the method includes communication between at least one sensor fitted to the tank and the control unit, the communication enabling the control unit to automatically modify, based on a fill level in the tank, a feed parameter of one or both of the dosing stages. 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 tank, through an opening at the top of this tank which communicates 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 for the lime being created between an outlet (for example at a low point of the first dosing stage) of the hopper and the spray lance, a conduit or pipe allowing the moistened binder to circulate from the tank to the spray 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 exemplary embodiments, the method 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 circulation (driven at the exit of the second dosing stage) of the plant aggregate, which preferably includes hemp, towards the projection lance, initially while maintaining an air circulation (for example using a blower unit) in a pipe or conduit used for the pneumatic transport of the plant aggregate 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] The air circulation can be stopped shortly after the second step or simultaneously. It is understood that the stop control is effective in minimizing material losses, given that the activation or deactivation of the blowing can be decoupled from, or offset / delayed relative to, the circulation of the moistened binder downstream of the tank (circulation typically enabled by a screw and jacket pump or comparable 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. Sequentially, the following can be planned: - 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 feed stoppage comprising: - a stoppage of the first dosing stage and / or a first conveying section feeding the first dosing stage in order to stop a predetermined flow rate of dry binder; - a stoppage of the second dosing stage and / or a second conveying section feeding the second dosing stage in order to stop the flow rate of plant-based granules; and - Valve control of 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 can be supplied from a pressurized tank or a conventional water supply. The control means can activate / deactivate and, for example, coordinate 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] According to a preferred embodiment, 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 provides for the use of a sensor in the conveying means to enable counting of 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 in solid material (aggregate or dry binder) on one of the feed lines or in one of the dosing stages, in order to indicate the need for the addition of an extra bag(s) in a loading area for means of transport (dedicated drop-off area provided for each supply line, at an end opposite to the unloading area).

[0030] According to one particular feature, the machine or device includes a control means capable of controlling at least one of the following: the flow rate of moistened binder exiting the tank, the flow rate of plant-based granules, and the predetermined flow rate of dry binder, based on information representing the tank's fill level. It may be possible to control the supply of water or aqueous solution, insofar as water forms 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 used: - 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 and second dosing stages are each equipped with a feed hopper, so that the device comprises a first and second hopper that are functionally separate and elongated in the same direction. - The dry binder supply is formed by a descending conduit (for example, through a vertical axis) extending from the first dosing stage to a top opening in the tank, so that the tank is located below 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] According to one particular feature, the tank outlet incorporates or is traversed by a rotating element, rotating about a horizontal axis perpendicular to the stirring shaft, participating in The evacuation of the moistened binder. This rotating element can 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 said rotating element, to the spraying section via a flexible hose. The pump, which enables the distribution of this flow, can be of the helical screw type and has, on the outside of the tank, a termination fitting for attaching a flexible connecting hose separate from the pneumatic conveying path.

[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 includes spraying / projecting the mixture, using a lance, in continuous phases, without operator intervention other than the operator holding and directing the spray lance. Optionally, the control unit in the machine allows for the shutdown of the first dosing stage and / or the first conveyor section feeding the first dosing stage in order to stop the predetermined flow of dry binder, as well as the shutdown of the second dosing stage and / or the second conveyor section feeding the second dosing stage in order to stop the flow of plant-based granules. This can allow the upstream supply to the tank and the junction to be stopped when measured / determined parameters indicate an approaching supply shortage or a lack of raw material demand due to the operator reaching 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 method makes it possible to automate the preparation of the composition of the multi-material mixture to be sprayed, including the plant aggregate and the moistened binder, with at least one sensor or part of a detection 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 use of the machine, the process provides for a start-up cycle which can be controlled by entering setting parameters, for example using a screen (touch screen) and / or an input interface, which may include: - a type of plant aggregate, with where applicable its density and / or the 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 / 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 / only plant-based aggregate (of a specific type, which does not vary, for example, determined by a parameter) and a second zone for depositing bags containing selectively / only dry binder. These two zones are spaced 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 options of the preparation process, the tank is pre-filled with water, for example, at least to a predefined level. The dry binder is fed into the tank, and the agitator equipment 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, allowing it to circulate through the pipe. sending, for example to a valve or obturator of the pump where the junction of the respective flows takes place. After the initial 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 based on the fill level(s) determined by the sensor(s): this moistened binder has a homogeneous and constant composition, and it can be delivered to the spray lance or nozzle by the motorized pump coupled to the tank, which can extend radially outwards from a side wall of the tank. This pump is a rotary screw type (for example, an eccentric screw type, such as the Moineau™ pump). In some embodiments, the moistened binder / hemp mixture is prepared downstream of this pump, in the handheld spray lance.

[0039] It is understood that the moistened binder is prepared during this start-up phase / cycle, which is a phase during which the spraying does not begin, given that the air blower unit's blower remains off until the operator has started a running / spraying cycle. The pump, which is primed by being connected to the moistened binder delivery hose, starts as soon as the plant granules arrive in the spray lance, to allow 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 provided on a remote control), so that there is a higher 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 granulate tube. As soon as this tube is empty, the pump stops to halt the delivery of the moistened binder.

[0040] If the tank stops and / or the spraying stops for an extended period, for example, reaching or exceeding 30 minutes, an interface may recommend cleaning. Regardless of a cleaning alert mode, the moistened binder can be cleaned in the tank. The tank is a mixing tank or mixer unit, equipped with a cleaning nozzle (at least one nozzle), mounted on a tank wall opposite the bottom of the tank.A drainage opening is provided in the bottom of the tank for evacuation during the cleaning phase via a passage in the tank which is located lower and is separate from the outlet for the moistened binder during a spraying cycle. More broadly, depending on the application (for example, spraying on a roof or a wall), the actual flow rates to be delivered to the junction can be adjusted without intervening on the vertically mounted agitator tank: the device can be programmed in such a way different, with an adjustment of the mass percentages in the binder / aggregate pair, while taking advantage of sensor information. Brief description of the drawings

[0041] Other features, details and advantages will become apparent from reading the detailed description below, and from analyzing the attached drawings, on which: [Fig.1] is a perspective view illustrating a machine for preparing a mixture to be sprayed, before the installation of the hose for sending the moistened binder to the spray lance. Figure [Fig. 2] shows a non-limiting example of an arrangement of two dosing stages arranged in parallel, this arrangement being able to be part of the machine in [Fig. 1]. Figure 3 illustrates, by means of 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. Fig. 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 5 schematically illustrates an automated operating mode, using a sensor-equipped part mounted in the tank of a device / machine for preparing and projecting a mixture including plant granulate and the moistened binder prepared in the tank. Fig. 6 shows, by schematic view, an example of a spray lance or nozzle, suitable for complementing a machine / device like the one shown in Fig. 1, allowing the moistened binder and the plant aggregate to be projected together. Fig. 7 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 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 representing steps that can be used to control certain parts of the transport equipment and adjust material flow rates. Figure 10 is a flowchart illustrating steps that can be performed and combined, in a non-limiting example of a process using two lines feeding system, 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, certain dimensions may be exaggerated for illustrative purposes. In the various figures, the same reference numerals designate identical or similar elements. The Z direction designates the vertical and the Y direction a transverse direction of width. Throughout, reference is made to a tank 5 having a single internal volume V5 (see [Fig. 3]), without this being limiting to the total number of tanks that a device 1 for preparing and spraying a moistened binder mixture + plant granule 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 this being limiting to the transport structure that a machine 1 may have for preparing a mixture of moistened binder + 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 [Fig. 6].

[0043] As shown in [Fig. 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). Where appropriate, motorized or hazardous parts are not made accessible laterally, by using at least one barrier or gate, such as a wire mesh gate in certain options.

[0044] The device 1 comprises, on the support structure 3, a first dosing stage 41 supplied with dry binder 61 and a second dosing stage 42 supplied with plant granule 62. Transport means MT, 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 provided to form the MT transport means, which allow the bags Bl, B2 to be moved from the corresponding loading area to a hopper area located higher up. The MT transport means are, for example, distributed in parallel to raise the respective bags Bl and B2 to the level of: - 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 Bl of dry binder and a left-hand conveyor for bags B2 of lightweight aggregate is illustrated in [Fig. 1], other arrangements can be made for feeding bags Bl, 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 jamb 3p provided to support this retractable section which can form the bag unloading area for bags Bl, B2 at the rear / opposite of the trailer link (front link to allow the device 1 to be towed by a vehicle).

[0046] With reference to Figures 1 and 6, the 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 [Fig. 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 bringing the plant aggregate 62 propelled by a blower unit US 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 [Fig. 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 an axis horizontal). Optionally, the conveyors are equipped with at least three or four circular blades each, allowing the respective bags to be opened by cutting the packaging lengthwise (along the conveyor's path). B1 and B2 bags can be deposited by the operator in a predetermined orientation, for example, when they are longer than they are wide.

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

[0049] The first dosing stage 41 may have a dosing screw VI, while the second dosing stage 42 may have a dosing screw V2, for example arranged parallel to the screw VL. The axis Al of rotation of the screw VI is thus parallel to the axis A2 of rotation of the screw V2, with each of the feed hoppers elongated along the same direction X (parallel to these axes Al and A2). The screws VI 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 towards a tank 5. The outlet 41s of the first stage 41 and the outlet 42s of the second stage may be arranged

[0050] With reference to Figures 2 and 3, the first dosing stage 41 has an outlet 41s connected to a mixer 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, positioned side by side, for example, movable by being hinged around a horizontal axis raised relative to 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 Bl, B2 are emptied, the device 1 can evacuate the bags without manual intervention, using bag evacuation equipment Tl equipped with hatches 1 lan 11b or other movable partitions giving access to a part of recovery, for example arranged transversely or perpendicularly to a general direction of transport of each conveyor of the MT means of transport.

[0052] As illustrated in [Fig. 3], a hatch 1la can be opened by being hinged on a top, optionally with an opening control provided by a cylinder 1le carried by the discharge element or equipment Tl. 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 Tl. 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, can be provided at the end of the hollow tubular structure of the compactor 30.It is permitted to eject bag or packaging residues onto one side of the support structure 3, with an opening of the container T30 which opens laterally at the level of one side of this support structure 3.

[0053] With reference to [Fig. 7], 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 Bl, B2 on the discharge zones Zdl, Zd2, allows both types of bags to be accommodated by the same opening 30a. The bag discharge equipment Tl, here with two movable gates, is interposed between each discharge zone Zdl, Zd2 and the upper opening 30a, being configured to temporarily block a bag passage (passage leading above the upper opening 30a and closed by a gate lia, 11b in the extended position of the cylinder 1le which allows the movement of this gate). The arrangement of the cylinders 1 is adapted so as not to hinder / interfere with the evacuation of bags, for example by mounting each fixed part of the cylinder 1 above the corresponding passage delimited by the TL equipment

[0054] The extraction module may include a sleeve 36, in the form of a sheath or sock, attached in a removable manner. 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 direction Y), delimited between two parallel walls, forming a front wall and a rear wall. The upper rear 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 equipment The evacuation barrier, here in the form of a barrier provided with two movable / articulated hatches on a hinge in the non-limiting example of figures 5 to 6B. The upper edge 31 of the equipment Tl can 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 the TL equipment. As in the case of Figure 5, the extraction module can have a motorized screw V3 (for example, motorized on the side opposite the opening of the T30 container), which includes propellers 32 allowing the emptied bags to be moved towards a bottom and to one side, along a trajectory that 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 [Fig. 8], in order to allow for a supply that minimizes operator intervention, typically with control capabilities and without manual handling of the unpacking of bags loaded in the 4t drop-off zones (possibly separated by a partition C3), the device or machine 1 may include two feed lines equipped with cutting elements 16a, 16b for notching bags, several transport sections 10a, 10b forming part of this first feed line. A configuration with a section 10a that can be folded down using an axis Xa or a hinge may be provided.

[0058] Figure 8 illustrates non-limiting 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 Zdl or Zd2 is formed, as seen for example in [Fig.7].

[0059] The machine 1 has a perforated or meshed portion 14c, possibly present in each discharge zone Zdl or Zd2. In each feed line, this perforated or meshed portion 14c is thus present above a hopper equipping 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 granule 62, can pass through this perforated portion and falls by gravity into the hopper via the access opening. of this dosing stage. Even with notches, the bags have dimensions that allow them to be conveyed along a path to the bottom of the discharge area where a hatch 1a or 11b ([Fig. 2]) extends, belonging to a bag discharge unit Tl, described below. Of course, any suitable localized cutting process, which does not significantly alter the bag dimensions, can be used to allow the bag to open at the notches, typically without loss of bag fragments / 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 cutting of Bl1, B2 bags, the preparation process allows for two parallel dosings of the plant granule 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 [Fig. 10], the process is carried out using: - an interface of the machine / device 1 for the 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 Cl, 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 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 the machine 1, controlling drive elements (worm gear rotation) and one or more pumps and a set of valves V. More broadly, a control unit 120 can: - to 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 carried out by the control unit in order to: - optionally control the MT transport means which 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 zones; - 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 method, 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. In [Fig.10], non-limiting information is provided in step 91a of interaction with sensors, regarding the monitoring of parameters reflecting: the level of the hoppers of the dosing stages 41, 42, the number of bags being transported, by the MT transport means, to either of the dosing stages 41, 42, the determination that one or more tank 5 filling level thresholds 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 according 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 retrieved by the control unit 120. To ensure control of the phase / step 96 of mixing the dry binder 61 with water, the device / machine 1 can be equipped with one or more sensors providing an indication / information that a fill level has been reached or exceeded and / or information representing an insufficient fill level, in the tank 5. With reference to [Fig. 3], one or more fill thresholds may These parameters can typically be configured to allow for the resumption of dry binder 61 supply when it is determined that the actual (real-time measured) fill level has fallen below the reference hs threshold. This is compatible with continuous projection, 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 for detecting one or more fill levels of the tank 5 is shown. 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. Machine 1 can be instrumented by having various sensors. 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 tank 5 of moistened binder 63, the flow of plant granulate 62 and the determined flow of dry binder 61 obtained at outlet 41s, as a function of information representative of the filling level of tank 5, and preferably also as a function of a projection flow command entered (optionally) by a human-machine interface.

[0065] Figure 5 schematically illustrates, with a connection L5, the possibility of connecting the sensor or sensor assembly(ies) 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 forming part of the mixture to be sprayed (formed by coated particles 15) or, conversely, to slow down or stop one or both of the supply lines, at least in a section thereof. This can also concern the water supply, which is provided, for example, by means of a fitting RC1 with a valve, in the non-limiting case of 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 connected to a water inlet pipe via the RC1 fitting.

[0066] The control unit 120 can also be linked to sensors fitted to the hoppers of the dosing stages 41, 42, for example to control the MT transport means according to a fill level in the hoppers of these respective stages 41 and 42. The L5 link can be used so that the CM control means restarts the conveyor that moves the dry binder 41 and thus improves / increases the filling 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 5 and 10) to restart / start the MT conveying means, for example, by starting a conveyor when the level in the hopper for dry binder 61 is low. A bag B1 can then be raised 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 raised 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, which allows the aggregate 62 to be sent in an airflow towards the junction J to then allow the mixture with the aggregate coated by the moistened binder to be projected, as described later. This sending corresponds to a pneumatic conveying 97b.

[0068] In the 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 m3 / h of consumption (flow rate) in aggregate 62 (for example hemp), and / or able to exceed 1 to 3 m3 / h of consumption (flow rate) in dry binder 61 (for example lime).

[0069] The series association of the first part of the MT transport means dedicated to the transport of the dry binder 61, the first dosing stage 41 and the tank 5 with the agitator equipment 6 and the pump 7, makes it possible to constitute an automated supply line to prepare and deliver the flow F5 of moistened binder into the supply pipe or conduit Cl connecting to the junction J, here provided on the lance 8 for example. Figure 3 shows, by three arrows, the path of the dry binder 61 which follows a trajectory with a reversal, insofar as the screw VI of the first dosing stage 41 can circulate this dry binder 61 in the opposite direction to its direction of supply on the screener or similar discharge zone from the top of this dosing stage 4L. In this non-limiting example, the thicker arrows on the left of Figure 3 show a path of the remnants of packaging / bags B1 which may have been cut.

[0070] The second part of the MT transport means dedicated to the transport of the plant aggregate 62, the second dosing stage 42 and the plant aggregate transfer part 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, with the use of sensors, by forming a plant aggregate 62 supply line. For this second supply line (of hemp or any suitable lightweight aggregate 62), the machine or device 1 can offer the operator an input, for example on a touch screen, of the type of plant aggregate and a length of the blowing pipe, forming a long conduit C2 up to the lance 8, placed for example on an outlet 42s of the second dosing stage 42. Advantageously, a compactor 30 or other equipment for processing the remains of bags Bl, B2, can be common to the two dosing stages 41, 42, so that the compactor 30 illustrated in [Fig.3] for collecting bags B1 can also collect bags B2 which return to the temporary reception area of ​​container T30, as can be understood from [Fig.1]. Example of integrating a tank with an agitator into the device

[0071] As can be seen in particular in [Fig. 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 carry 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 cover for ventilation. A movable element 5d can be part of the lid or upper wall element 5c, for example with a handle 55 as illustrated in [Fig. 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 external side of the support structure 3. The movable element 5 is, for example, complementary to a fixed horizontal part carrying the drive means 6d used to actuate the rotation of the vertical agitator shaft 60.

[0072] The tank 5 is wider than it is tall in the example of Figures 3 and 4. More generally, the tank 5 has a format adapted to obtain homogeneous agitation, for example by having 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 different sides in a right-left direction (lateral direction Y as seen in [Fig. 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 [Fig. 3] (which corresponds to a conveying direction for the delivery of dosing stages 41 and 42 from the same rear side, the X direction being a longitudinal / extensional direction of structure 3).

[0073] In the 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 ([Fig. 3]) of the tank 5, which passes through the top cover / wall element 5c, so that the tank 5 is below the first dosing stage 4L. The tank 5 is adapted to be filled with water before the discharge of the dry binder 61, which is discharged according to the dosing rate obtained at the outlet 41s of the first dosing stage 4L. For this purpose, the tank 5 can include a tap or a water / aqueous liquid supply device, typically mounted on the top 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 that 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 which is connected to a screw 63. A jacket can form a conduit for the pump 7 used to adjust the outgoing flow rate of moistened binder 63, thus allowing the conveyance 97a of the moistened binder 63 towards / to a spray nozzle 8. The arrow F5 in [Fig. 3] illustrates the flow of moistened binder F5 entering the flexible hose forming conduit Cl or joining such a conduit which connects to the other conduit C2 via junction J ([Fig. 6]). The pump 7 is, for example, an off-center helical screw pump in 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 [Fig. 4].

[0074] Regardless of the method of circulating the moistened binder 63 to obtain an outlet flow rate F5 at the outlet 7, the pump 7 can be provided to extend horizontally by connecting to this outlet 07, preferably by having a rotating element of this pump 7 that passes horizontally through the outlet 07. Typically, a flow rate of the flux 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 disposed external to the tank, on the platform P10 or other 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 that extends between a first external end (outside the tank) connected to the motor M7 and a second end that connects, for example, through the opening or outlet 07, to the screw drive housed in the body of the pump. As seen in the [Fig.3] In particular, 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 opening 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 4L. This inlet 52 can correspond to the termination point of a screw (Archimedes screw), given that a gap can 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 screw shaft VL. The inlet 52 can include the opening 05 which is located under the terminal section of this shaft, between the terminal helix 12 and the PI bearing. Example of automated operation

[0076] Upstream of the tank, the device 1 can discharge, using the transport means MT, the solid materials into the first dosing stage 41 and the second dosing stage 42, respectively: no liquid is required in these stages 41 and 42. Conversely, the tank 5 is filled with aqueous liquid / water, possibly as soon as operations start. The tank 5 has a lower, first filling zone Za, where an agitator element (lower propeller in the example of [Fig. 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 through inlet 51 occurs until a threshold is reached or exceeded, which may, for example, exceed at least one of the stirring elements 6a, 6b, optionally exceeding the highest of the stirring elements 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 stirring element 6a is located in zone Za, being submerged, and a second stirring element 6b (attached to the same shaft 60) is located in zone Zb, also being submerged.

[0078] A counting unit can be used to count the number of torn / cut bags, 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). The dry binder 61 and the lightweight aggregate 62 are dosed, and the tank 5 is filled by adding the dry binder 61, which is then stirred with water. The sensor part C5 (forming or belonging to the sensing assembly) may 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 which may 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 through the inlet 51.

[0079] To enable projection, device 1 simultaneously uses: - 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 Cl, preferably with the use of a flow meter for the control of the flow F5. The connection with junction J of conduits Cl and C2 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 predominantly 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 [Fig. 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. Notwithstanding, the transfer conduit 80b may be portable and allows the forming product, consisting of the coated particles 15 and the moistened binder 63, to be projected. 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 and may optionally be smaller than the cross-sectional area provided at the junction J.

[0081] In one embodiment, the connection J can be formed on the side of a first conduit Cl for the transport of the moistened binder 63. This is a connection J which is simple and provided 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 with respect to a central axis D8 defined by the first conduit Cl near the connection J. This central axis D8 corresponds here to an injection axis of the moistened binder 63 conveyed by the first conduit Cl (which may include a part of the flexible hose for sending the moistened binder) and can be confused with a central axis defined at the outlet 80c of the conduit 80. Of course, the connection of the two conduits Cl and C2 can be made in different forms and the case of [Fig.6] is not limiting for the type of junction that is formed near the outlet 80c. An 80a fitting, for example male, can allow the flexible hose forming the Cl conduit to be connected to a rigid connection fitting provided on the lance 8.

[0082] A final projection step 98a ([Fig. 10]) can be performed to complete the projection permitted by the process, immediately after the stop 98 commanded by the operator (preferably via an interface provided on the projection lance 8). For example, when solid materials no longer arrive from the pipes / ducts Cl, 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 granules in the duct C2. Thus, the control unit 120 can stagger successive commands as follows: - the stoppage of the circulation of the plant granule is immediately commanded, initially, by maintaining air circulation using the US blower unit up to the projection lance 8; - by taking into account the length of the pipe / conduit Cl, 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 granulate 62; - the shutdown of the US wind tunnel unit. Cleaning

[0083] With reference to Figures 3, 5, and 10, the 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 99. The machine 1 can include a control cabinet or interface that signals a need for cleaning of the tank 5, for example, when a spraying cycle is completed (with a voluntary stop 98) 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 the tank 5.In parallel with the water inlet 51, the tank 5 may have cleaning means T, RC2, 90 allowing the spraying of a liquid which is directed onto the shaft 60 with its stirring element(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 carried 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 has, for example, 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 of a conduit underlying this port 09, the tank 5 can include a lower tubular conduit forming a support for 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, can be carried by the tank 5, for example at the level of this lower tubular conduit which 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] With reference to [Fig. 10], a cleaning cycle can thus correspond to one or more steps 99 which can be linked together, 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 connection in the case of [Fig. 4]). Water is then sent through the spray / wash nozzle 90 to clean the tank 5. The valve 9, which serves as a drain / sewage valve, opens to discharge the wash water. A rinsing phase can be implemented and / or the cleaning is completed by starting the pump 7 so that the cleaning extends to the pipe / conduit Cl for the moistened binder 63.

[0086] In optional configurations, 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 actuate: - 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 the tank 5, the control means MC provided in unit 120 can be coupled to the MV interface to maintain: - a first VIO valve element in an open state to allow water to be supplied to tank 5 with an adjustable flow rate, - a second valve element V20 closed, so that it blocks a cleaning path VN which can be fluidically connected to 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 VIO 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 first 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 Bl, B2 can be unloaded into a pair of loading zones. From such a loading zone, forming one end of the MT transport means (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 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 only requires the effort of depositing bags Bl, B2 into a lower part of the device 1, typically located lower than the top access to the respective hoppers of the dosing stages 41 and 42. The sensor(s) allow for indicating that a tank fill level is below a threshold hs, which can mean that the preparation phase is not yet complete.Therefore, the operator enters the command and control parameters of the preparation / projection process and can wait for information to be delivered before starting the projection, which can then be done continuously.

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

[0090] In device 1, as shown in [Fig. 2], the first dosing stage 41 may have a height H1 greater than 50 or 60 cm and may be smaller or narrower than the second dosing stage 42, for example, by being less wide and less tall (smaller vertical dimension). The height of the second dosing stage 42 may be greater than or equal to 90 or 100 cm. The ratio H1:H2 may be less than 0.75, possibly less than or equal to 0.6. This may facilitate the integration of the tank 5 under the first dosing stage 4L 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] This disclosure is not limited to the embodiments described above, only by way of example, but encompasses all the variants that a person skilled in the art may consider within the framework 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 [Fig. 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.

[0092] Furthermore, conveyor assemblies of the conveyor belt type 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 [Fig. 8], for example. Such a function is optional here and / or may apply to only one of the conveyor assemblies. The parallel arrangement (with a small gap e4 in [Fig. 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 respective dosages, in parallel, of a plant aggregate (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: - using a control unit (120) connected to a parameter detection set arranged at one or more locations of the machine (1); - carrying 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;- receive, in said 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 of the tank (5); in which several control steps are carried out by the control unit (120) in order to: - control the first dosing and control the second dosing, by controlling 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 the respective flow rates, preferably mass flow rates, of the plant aggregate (62) and 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. A method according to claim 1, comprising detection (91a), by the detection assembly, of at least one representative parameter 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 (Bl), 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) to be 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 the 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 by means of sensors belonging to the detection set, these values ​​being representative of: - a flow rate of the dry binder at an inlet of the tank (5) or of the moistened binder at the outlet of the tank (5); and - 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 (Zdl) 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 the discharge of the plant aggregate (62) towards the second dosing stage (42), in which a 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 path of the lime being made between an outlet of the hopper and the projection lance (8), a conduit or pipe (Cl) allowing the moistened binder (63) exiting the tank (5) to circulate to the projection lance (8), the tank (5) being: - provided with a cover (5c) with a barrier effect against dust; and - designed to delimit a closed internal volume (V5) which forms part of the closed circulation path.

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 in which a stop step initiated by the stop command includes: - stopping the circulation of the plant aggregate, which preferably includes hemp, towards the projection lance (8), initially while maintaining an air circulation using a blower unit (US) in a pipe or conduit (C2) used for the pneumatic transport of the plant aggregate (62) 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 plant aggregate (62) to the projection lance (8).

10. A method according to any one of the preceding claims, comprising a feed stop including: - a stop of the first dosing stage (41) and / or of a first conveying section feeding the first dosing stage (41) in order to stop a predetermined flow of dry binder (61); - a stop of the second dosing stage (42) and / or of a second conveying section feeding the second dosing stage (42) in order to stop the flow of plant aggregate (62); and - a control of valves of a set of valves (V) by the control unit (120);knowing that the control of valves allows: - during a first mode corresponding to a mixing in the tank (5), to keep a first valve element (VIO) 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 (VIO) of said assembly, while the second valve element (V20) of said valve assembly (V) is open for the flow of a cleaning liquid; 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 the 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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