EP0365422B1 - Process for bringing together a liquid basic product and a hardener in order to obtain a rapid curing product, means for carrying out this process and apparatus provided with this means - Google Patents

Abstract

The invention relates to a method and apparatus for bringing together a mixture comprising a basic liquid product and a hardener with a view to attaining a fast-hardening product for spraying a surface characterized in that upon the interruption of the spraying, a circuit for adjusted delay is activated for a period of time between a zero value and a value at least slightly less than the hardening time of the hardener when air-sealed. At the end of the predetermined period of time delay, with the aid of this delay circuit, a signal is emitted, the signal is operatively applied to circuits to cause the feeding of the base and hardener (2) to the mixer to be interrupted while an evacuation and cleaning cycle is triggered. This cycle includes, in particular, alternating phases of washing, using at least one solvent, and rinsing. During the cleaning cycle, the hardener is returned to its reservoir by way of a recirculation circuit. The invention is applicable to the engineering industry, and in particular to equipment for marking roadways.

Description

The invention relates to a process for bringing together a basic liquid product and a hardener in order to produce a product with rapid hardening.

It also relates to the means for implementing this process and to the installation provided with these means.

It applies more particularly but not exclusively to the field of the application on the ground of marks in particular of road signs.

In this field, paint distribution methods are known, in particular using a so-called "airless" circuit, mainly comprising a motor, driving at least one pump expelling the paint contained in a tank by a circuit. leading to a spray nozzle on the ground.

The motor driving the paint pump can be of any known type and for example consist of a hydraulic motor supplied by a hydraulic circuit comprising a variable flow pump taking oil from a reservoir to lead it to the hydraulic motor after passing through a connection to a safety valve then by a pressure reducer / regulator and possibly a flow reducer avoiding runaway motor and / or a flowmeter, for example connected to a computer, depending on the ratio of the two circuits to determine the paint flow rate.

The oil pump is itself driven by any known means such as a heat engine.

All of these means are generally mounted on the chassis of a vehicle.

The characteristics of the nozzle and its height above the ground determine the width of the paint deposit.

The nozzle flow rate and the vehicle advance speed determine the thickness of the paint layer deposited.

By interrupting the flow rate of the nozzle which is obtained by means of a controlled valve placed upstream of the nozzle, the limits of the marks to be produced are determined.

Next to the paint spraying nozzle, the vehicle generally carries a charge distributor such as retroreflective microbeads and / or sand.

In order to hinder road traffic for as short a time as possible, the paint must dry very quickly and for this purpose it is known to use a hardener.

To date, this hardener is in the form of a powder distributed in the manner or even jointly with the fillers.

It therefore only reaches the surface of the paint layer.

This method of bringing together the base product and the hardener does not allow mixing, and therefore a uniform drying of the paint.

In addition, it deteriorates the colors under which the paint appears.

For bringing two basic liquid products into contact, there are known (EP-45536, US-4,529,127) installations comprising, in addition to the main circuit, a secondary circuit with a secondary pump driving out the second liquid product contained in a secondary tank through the secondary circuit.

The main circuit and the secondary circuit both lead to the same mixer supplying the spray nozzle.

To respect the proportions of the mixture to be produced, the two pumps obviously have flow rates adjusted accordingly and the hydraulic circuits have their actions synchronized.

They can also be powered by the same hydraulic pump.

The installation described in patent EP-45536 cannot, however, be suitable for bringing a liquid product and a liquid hardener into the presence of a product which hardens as quickly as is desirable for a road paint and for example hardens approximately in one minute in the open air at 20 ° celsius or in thirty seconds away from the air.

Indeed, during the interruptions of the spraying, the mixed product would, of course, have time to solidify in the mixer and make this mixer unusable.

In the installation described in US Pat. No. 4,529,127, provision is made to drain and rinse the mixer, which is satisfactory for the components of conventional paints.

On the other hand, when the proportions of hardener relative to the base are very low and for example only 1 to 2%, the flow rate of the hardener circuit is low and its low speed and the constancy of pressure that the pump communicates to the hardener quickly lead the liquid and solid parts of it to separate from each other and make this hardener unusable.

A result which the invention aims to obtain is a method of bringing together a base and a hardener which ensures uniform mixing of the product obtained and which does not affect the colors in which this product appears.

It is also a result that the invention aims to obtain a process which ensures that the distribution means cannot become clogged and that the hardener will remain usable for a very long time.

• dès l'interruption de la pulvérisation, on active un circuit de temporisation réglée sur une durée comprise entre une valeur nulle et une valeur au moins légèrement inférieure au temps de durcissement à l'abri de l'air,
• au terme de la durée prédéterminée, à l'aide de ce circuit de temporisation, on émet un signal à l'aide duquel :
  • . on interrompt l'arrivée de la base (1) et du durcisseur au mélangeur et
  • . on enclenche le cycle de vidange et de nettoyage comprenant notamment en alternance, des phases de lavage avec au moins un solvant et des phases de rinçage, pendant lequel cycle de nettoyage, on commande le susdit retour du durcisseur vers son réservoir de manière à le recycler.

To this end, the subject of the invention is a method of the aforementioned type, according to which method, the secondary tank is supplied with liquid hardener which the secondary product circuit leads to the mixer which mixes it with the base before driving the mixture to the spray nozzle, and at the end of spraying, the arrival of the base and of the hardener in the mixer and a draining and cleaning cycle is initiated, during which draining and cleaning cycle, the hardener is returned to its tank so as to recycle it, this process being in particular characterized in that:

• as soon as the spraying is interrupted, a delay circuit is activated, set for a duration between a zero value and a value at least slightly less than the curing time in the absence of air,
• at the end of the predetermined duration, with the help of this timing circuit, a signal is emitted with the help of which:
  • . the supply of the base (1) and the hardener to the mixer is interrupted and
  • . the emptying and cleaning cycle is started including in particular alternately, washing phases with at least one solvent and rinsing phases, during which cleaning cycle, the above-mentioned return of the hardener to its tank is controlled so as to recycle it .

It also relates to the means for the implementation of this process and the installation provided with these means.

It will be clearly understood with the aid of the description below given by way of nonlimiting example with regard to the appended drawing which schematically represents an installation provided with means for implementing the invention.

Referring to the drawing, it can be seen that for placing a basic liquid product 1, such as a paint, and a hardener 2, the installation 3 mainly comprises a basic circuit 4 with in particular a motor 5 driving at least one pump 6 expelling the base 1 contained in a reservoir 7 in said circuit 4 leading to a nozzle 8 for spraying on the ground 9.

Upstream of the nozzle 8 is provided a valve P₁ controlled by circuits 35, 36 and making it possible to interrupt the spraying.

The motor 5 driving the base pump 4 consists for example of a hydraulic motor supplied by a hydraulic circuit 10 comprising its hydraulic pump 11 with variable flow taking oil 12 from a reservoir 13 to drive it to the hydraulic motor 5 after passage by a connection to a safety valve 14 then by a pressure reducer 15 and possibly a flow reducer 16, avoiding motor runaway, and / or a flow meter 17 for example connected to a computer 18 with microprocessor.

The oil pump is itself driven by a motor 19, for example an internal combustion engine.

All of these means are generally carried by a vehicle chassis (not shown).

Next to the spray nozzle 8, the installation can conventionally comprise at least one distributor (not shown) of charges such as retroreflective microbeads and / or sand.

The installation also includes a circuit 24 for secondary product with a secondary pump 26 controlled by a secondary motor 25 expelling the second product contained in a secondary tank 27 by the circuit 24 of the secondary product.

The circuit 4 of the main product and the circuit 24 of the secondary product both lead to the same mixer 21 supplying the spray nozzle 8 under the control of the controlled valve P₁.

The two pumps 6, 26 then obviously have flow rates adjusted to respect the proportions of the mixture to be produced and the main hydraulic circuit 10 has its action synchronized with that of a secondary hydraulic circuit 20.

This secondary hydraulic circuit 20, for example the main hydraulic circuit 10, passes through a pressure reducer 22 or even through a flow reducer 23 avoiding the runaway of the engine 25 and / or a flow meter 28.

These two hydraulic circuits 10, 20 are for example supplied by the same variable flow pump 11 and placed under the control of the same safety valve 14.

• on alimente le réservoir secondaire 27 avec du durcisseur liquide 2 que le circuit de produit secondaire 24 conduit au mélangeur 21 qui le mélange à la base 1 avant de conduire le mélange à la buse 8 de pulvérisation,
• dès l'interruption de la pulvérisation, on active un circuit de temporisation réglée sur une durée comprise entre une valeur nulle et une valeur au moins légèrement inférieure au temps de durcissement du mélange à l'abri de l'air,
• au terme de la durée prédéterminée, à l'aide de ce circuit de temporisation :
  • . on émet un signal à l'aide duquel on interrompt l'arrivée de la base 1 et du durcisseur 2 au mélangeur 21 et
  • . on enclenche un cycle de vidange et de nettoyage comprenant notamment en alternance, des phases de lavage avec au moins un solvant et des phases de rinçage.

In order to bring together the base and the hardener 2:

• the secondary tank 27 is supplied with liquid hardener 2 which the secondary product circuit 24 leads to the mixer 21 which mixes it at the base 1 before driving the mixture to the spray nozzle 8,
• as soon as the spraying is interrupted, a delay circuit is activated, set for a duration between a zero value and a value at least slightly less than the time for curing the mixture in the absence of air,
• at the end of the predetermined duration, using this timing circuit:
  • . a signal is emitted with the aid of which the arrival of the base 1 and the hardener 2 is interrupted at the mixer 21 and
  • . an emptying and cleaning cycle is initiated including in particular alternating, washing phases with at least one solvent and rinsing phases.

In order to avoid keeping the hardener under pressure during the cleaning cycle, the hardener is brought back upstream of the mixer to its tank so as to recycle it.

During recycling, the flow rate of the secondary product circuit 24 does not need to be maintained in the proportions, relative to the flow rate of the primary circuit, necessary for mixing also to accelerate the circulation of the hardener and therefore recycling, according to a Another characteristic of the invention, the movement of the motor 25 controlling the secondary pump 26 ensuring the circulation of the hardener is accelerated.

For this purpose, on a part 29 of the secondary hydraulic circuit 20, a branch 30 is established and on at least one of the sections which form this branch 30 and the part 29 of the circuit bypassed by this branch, the flow is regulated so that in the bypass 30, the flow is greater than in the part 29 of the circuit 20 bypassed by this bypass 30 and at the time of recycling, we pass the hydraulic flow of the secondary circuit by the bypass while during mixing we pass the secondary hydraulic flow or circuit through part 29 of the secondary circuit which was bypassed by the bypass.

In a preferred mode, the presence of the base and the hardener at the top of the mixer is monitored and, in the absence of at least one of them, the feeding of the mixing head is prohibited.

Advantageously, during the cleaning cycle, soaking phases with the solvent are provided.

Likewise, a phase of drying in pressurized air is provided.

• des vannes commandées P₂, P₃ à l'arrivée à l'entrée du mélangeur 21 des circuits 4 de base 1 et 24 de durcisseur,
• des circuits 31, 32 d'amenée des produits utilisés lors des différentes phases du cycle de nettoyage, lesquels circuits 31, 32 sont raccordés en tête du mélangeur 21, en aval des vannes commandées P₂, P₃ des circuits 4 et 24 de base 1 et de durcisseur 2,
• des vannes commandées P₄, P₅ contrôlant l'arrivée en tête du mélangeur des produits de nettoyage par leurs circuits 31, 32,
• raccordée en sortie du mélangeur, en amont de la vanne commandée P₁ contrôlant la pulvérisation, un circuit 33 d'évacuation des produits contenus dans le mélangeur, conduisant à un réservoir 34 reccueillant ces produits tels les mélanges de solvant et de durcisseur,
• une vanne commandée P₆ contrôlant l'évacuation vers le réservoir 34 des produits contenus dans le mélangeur par leur circuit 33,
• relié aux circuits 35, 36 de commande de la vanne P₁ contrôlant la pulvérisation, un circuit 37 de temporisation d'une part, pourvu d'un moyen 38 de réglage entre une durée nulle et une durée au moins légèrement inférieure à celle nécessaire au durcissement du mélange à l'abri de l'air et, d'autre part, émettant au terme de cette durée un signal,
• un circuit 39, 40 qui a réception de ce signal commande la fermeture des vannes commandées P₂, P₃ d'arrivée au mélangeur de la base 1 et du durcisseur 2 et enclenche un cycle de vidange et de nettoyage comprenant en alternance des phases de lavage avec au moins un solvant et des phases de rinçage.

With a view to implementing the method according to the invention, in addition to the controlled valve P₁ which, at the outlet of the mixer 21, is provided just upstream of the nozzle 8, the installation comprises:

• controlled valves P₂, P₃ on arrival at the input of the mixer 21 of the base 4 circuits 1 and 24 of hardener,
• circuits 31, 32 for supplying the products used during the different phases of the cleaning cycle, which circuits 31, 32 are connected at the head of the mixer 21, downstream of the controlled valves P₂, P₃ of the basic circuits 4 and 24 1 and hardener 2,
• controlled valves P₄, P₅ controlling the arrival at the top of the mixer of cleaning products via their circuits 31, 32,
• connected at the outlet of the mixer, upstream of the controlled valve P₁ controlling the spraying, a circuit 33 for evacuating the products contained in the mixer, leading to a tank 34 collecting these products such as the solvent and hardener mixtures,
• a controlled valve P₆ controlling the evacuation to the reservoir 34 of the products contained in the mixer through their circuit 33,
• connected to circuits 35, 36 for controlling the valve P₁ controlling the spraying, a timing circuit 37 on the one hand, provided with means 38 for adjusting between a zero duration and a duration at least slightly less than that necessary for hardening of the mixture protected from air and, on the other hand, emitting a signal at the end of this period,
• a circuit 39, 40 which on receipt of this signal controls the closing of the controlled valves P₂, P₃ arriving at the mixer of the base 1 and the hardener 2 and starts a draining and cleaning cycle comprising alternately washing phases with at least one solvent and rinsing phases.

• une conduite de recyclage 54 du durcisseur 2 raccordée au circuit 24 du durcisseur 2 en amont de la vanne commandée P₂ contrôlant l'arrivée du durcisseur 2 au mélangeur 21, laquelle conduite de recyclage 54 retourne au réservoir secondaire 27 du durcisseur,
• intercalée sur cette conduite de recyclage 54, une vanne commandée P₇ contrôlant le retour du durcisseur 2 à son réservoir 27.

Preferably, the installation further comprises:

• a recycling pipe 54 of the hardener 2 connected to the circuit 24 of the hardener 2 upstream of the controlled valve P₂ controlling the arrival of the hardener 2 at the mixer 21, which recycling pipe 54 returns to the secondary tank 27 of the hardener,
• interposed on this recycling pipe 54, a controlled valve P₇ controlling the return of the hardener 2 to its reservoir 27.

Advantageously, in order to accelerate the recycling of the hardener, on a part 29 of the secondary hydraulic circuit 20, a bypass 30 is established and on at least one of the sections that form this bypass 30 and the part 29 of circuit bypassed by this bypass , a flow regulator 44, 45 is inserted so that in the bypass 30, the flow is greater than in the part 29 of the circuit 20 bypassed by this bypass 30 and at the head of the bypass and the bypassed part, we interpose a distributor 50 directing the oil to one or other of the sections 29, 30 namely at the time of recycling, the flow of the secondary circuit is passed through the bypass 30 while during mixing the flow of the secondary hydraulic circuit by part 29 of the secondary circuit which was bypassed by bypass 30.

The installation also comprises means for monitoring the presence of the base and the hardener at the top of the mixer and means preventing the supply of the mixer in the event of a fault in at least one of these products.

• à l'état initial, la vanne P₇ du circuit de recyclage 54 est ouverte tandis que toutes les autres vannes P₁ à P₆ sont fermées,
• ensuite, le mélangeur 21 est mis en pression par ouverture des vannes P₂, P₃ d'amenée de la base 1 et du durcisseur 2 tandis que les autres vannes sont fermées,
• puis commence l'application par ouverture de la vanne P₁ de pulvérisation et,
• dès que la vanne P₁ de pulvérisation se referme pendant le temps préréglé, le circuit de temporisation enclenche le cycle de rinçage :
  • . tout d'abord par une phase de décompression, pendant laquelle les vannes P₂, P₃ d'amenée de la base et du durcisseur et la vanne P₁ de pulvérisation sont fermées tandis que les autres vannes P₄ à P₇ sont ouvertes,
  • . puis un rinçage chimique pendant lequel seules les vannes P₄, P₅ d'amenée des agents nettoyants et la vanne P₇ du recyclage sont ouvertes.
  
  Le rinçage peut alors être répété plusieurs fois avant un rinçage final pendant lequel on ouvre en plus la vanne P₆ d'évacuation du produit contenu dans le mélangeur,
• enfin on termine le rinçage par fermeture des vannes précitées à l'exception de celle P₇ de recyclage pour retrouver l'état initial.

The cycle takes place as follows:

• in the initial state, the valve P₇ of the recycling circuit 54 is open while all the other valves P₁ to P₆ are closed,
• then, the mixer 21 is put under pressure by opening the valves P₂, P₃ supplying the base 1 and the hardener 2 while the other valves are closed,
• then begins the application by opening the spray valve P₁ and,
• as soon as the spraying valve P₁ closes for the preset time, the delay circuit starts the rinsing cycle:
  • . firstly by a decompression phase, during which the valves P₂, P₃ supplying the base and the hardener and the spraying valve P₁ are closed while the other valves P₄ to P₇ are open,
  • . then a chemical rinse during which only the valves P₄, P₅ for supplying the cleaning agents and the valve P₇ for recycling are open.
  
  The rinsing can then be repeated several times before a final rinsing during which the P₆ valve for discharging the product contained in the mixer is opened,
• finally, the rinsing is terminated by closing the aforementioned valves, with the exception of that of recycling P pour to return to the initial state.

The chemical rinsing preferably takes place for a short time, for example five seconds, followed by a period of soaking with the solvent also of the order of five seconds, this repeated several times and for example between one to twelve times.

Advantageously, all of the controlled valves are provided with a double control, one main electric, the other spare tire.

The mixer 21 advantageously comprises a first mixer 41 of the so-called "whorl" type communicating to the products successive accelerations and braking promoting their mixing at the outlet of which is connected a flexible pipe 42 for connection to a second mixer 43 of the static so-called "divider" type which, by dividing the flow, perfects the mixture.

Claims (9)

1. Method for bringing together a liquid base product (1) and a hardener (2) for the purpose of producing a quick-hardening product by means of an installation (3) comprising principally:

   - a base material system (4) with in particular a motor (5) driving at least one pump (6) expelling the base material (1) contained in a tank (7) into the said system (4) leading to a nozzle (8) for atomising on the ground (9),

   - a system (24) for a secondary product with a secondary pump (26) expelling the second product contained in a secondary tank (27) through the secondary product system,

   - the base material system (4) for the main product and the system (24) for the secondary product both lead to the same mixer (21) feeding the atomisation nozzle (8),

   - the two pumps (6, 26) obviously therefore having outputs adjusted so as to match the proportions of the mixture to be produced,

      according to which method the secondary tank (27) is supplied with liquid hardener (2) which the secondary product system (24) conveys to the mixer (21) which mixes it with the base material (1) before conveying the mixture to the atomisation nozzle (8) and, on completion of the atomisation, the feeding of the base material (1) and hardener (2) to the mixer (21) is interrupted and a drainage and cleaning cycle is started,
      during which drainage and cleaning cycle the return of the hardener to its tank is actuated so as to recycle it,
      this method being CHARACTERISED in that:

   - as soon as the atomisation is interrupted by means of a valve (P₁) located upstream of the nozzle (8) and controlled by circuits (35, 36), a time delay circuit (37) is activated, set to a time between a nil value and a value at least slightly less than the hardening time in the absence of air,

   - at the end of the predetermined time, by means of this time delay circuit, a signal is transmitted by means of which:

   . the admission of the base material (1) and hardener (2) to the mixer (21) is interrupted, and

   . the drainage and cleaning cycle is started, comprising in particular, in alternation, stages of washing with at least one solvent and rinsing stages, during which cleaning cycle the above-mentioned return of the hardener to its tank for recycling is actuated.
2. Method according to Claim 1 in which:

   - on the one hand, the motor (5) driving the base material pump (6) consists of a hydraulic motor fed by a hydraulic circuit (10) comprising its variable capacity hydraulic pump (11) taking oil (12) from a tank (13) and conveying it to the hydraulic motor (5) after passing through a coupling with a safety valve (14) and then through a pressure reducer (15) and optionally a flow reducer (16), preventing the racing of the motor, and/or a flow meter (17) for example connected to a microprocessor computer (18), and

   - on the other hand, the motor (25) driving the pump (26) for the hardener (2) is also hydraulic and positioned in a secondary hydraulic circuit (20),

      and in which moreover:

   - the main hydraulic circuit (10) has its action synchronised with that of the secondary hydraulic circuit (20),

   . this secondary hydraulic circuit (20), like the main hydraulic circuit, passes through a pressure reducer (22) and even through a flow reducer (23) preventing the racing of the motor (25) and/or a flow meter (28),

   . these two hydraulic circuits (10, 20) being for example fed by the same variable capacity pump (11) and placed under the control of the same safety valve (14),

      this method being characterised in that, on one part (29) of the secondary hydraulic circuit (20), a bypass (30) is provided and on at least one of the sections formed by this bypass (30) and the part (29) of the circuit bypassed by this bypass, the flow rate is regulated so that, in the bypass (30), the flow rate is greater than in the part (29) of the circuit (20) bypassed by this bypass (30), and at the time of recycling the flow in the secondary circuit is passed through the bypass whilst during the mixing the flow in the secondary hydraulic circuit is passed through the part (29) of the secondary circuit which was bypassed by the bypass.
3. Method according to Claim 1 or 2, characterised in that, during the cleaning cycle, stages for diluting with the solvent are provided for.
4. Means for the purpose of implementing the method according to any one of Claims 1 to 3, comprising:

   - controlled valves (P₂, P₃) at the feed to the inlets of the mixer (21) for the base material (1) system (4) and hardener (2) system (24),

   - systems (31, 32) for conveying products used during the cleaning cycle, which circuits (31, 32) are connected to the head of the mixer (21), downstream of the controlled valves (P₂, P₃) on the systems (4, 24) for the base material (1) and hardener (2),

   - controlled valves (P₄, P₅) controlling the admission to the mixer head of the cleaning products through their systems (31, 32),

   - connected to the outlet from the mixer, a system (33) for discharging the products contained in the mixer,
      these means being characterised in that they comprise, in addition to the controlled valve (P₁) which, at the outlet from the mixer (21), is provided just upstream of the nozzle (8):

   - connected to the circuits (35, 36) for actuating the valve (P₁) controlling the atomisation, a time delay circuit (37) on the one hand, provided with means (38) of setting between a nil time and a time at least slightly less than that required for hardening of the mixture in the absence of air and, on the other hand, transmitting a signal at the end of this time,

   - a circuit (39, 40) which, on receiving this signal, actuates the closure of the controlled valves (P₂, P₃) for admitting the base material (1) and hardener (2) to the mixer and starts a drainage and cleaning cycle comprising, in alternation, stages of washing with at least one solvent and rinsing stages.
5. Means according to Claim 4, characterised in that they comprise:

   - a tank (34) connected to the system (33) for discharging products such as mixtures of solvent and hardener, and

   - a controlled valve (P₆) controlling the discharge to the tank (34) of the products contained in the mixer through their system (33).
6. Means according to Claim 4 or 5, characterised in that they comprise:

   - a hardener recycling pipe (54) connected to the hardener (2) system (24) upstream of the controlled valve (P₂) controlling the admission of the hardener (2) to the mixer (21), which recycling pipe returns to the hardener secondary tank (27),

   - inserted in this hardener recycling pipe (54), a controlled valve (P₇) controlling the return of the hardener (2) to its tank (27).
7. Means according to Claim 6, characterised in that, on one part (29) of the secondary hydraulic circuit (20), a bypass (30) is provided and, on at least one of the sections formed by this bypass (30) and the part (29) of the circuit bypassed by this bypass, a flow regulator (44, 45) is inserted so that, in the bypass (30), the flow is greater than in the part (29) of the system (20) bypassed by this bypass (30) and, at the top of the bypass and the bypassed part, a distribution valve (50) is inserted, directing the oil to one or other of the sections (29, 30), that is to say at the time of recycling the flow in the secondary circuit is passed through the bypass, whilst during the mixing the flow in the secondary hydraulic circuit is passed through the part (29) of the secondary circuit which was bypassed by the bypass.
8. Means according to any one of Claims 4 to 7, characterised in that the mixer (21) advantageously comprises a first mixer (41) of the so-called "spiral" type imparting successive accelerations and retardations to the products which assist their mixing, and to the outlet from which is connected a flexible pipe (42) for connecting to a second mixer (43) of the so-called "dividing" static type which, by dividing the flow, improves the mixing.
9. Installation (3) comprising principally:

   - a base material (4) system with notably a motor (5) driving at least one pump (6) expelling the base material (1) contained in a tank (7) in the said system (4) leading to a nozzle (8) for atomisation on the ground (9),

   - a controlled valve (P₁) provided upstream of the nozzle (8) enabling the atomisation to be interrupted,

   - the motor (5) driving the base material pump (4) consisting for example of a hydraulic motor fed by a hydraulic circuit (10) comprising its variable capacity hydraulic pump (11) taking oil (12) from a tank (13) and conveying it to the hydraulic motor (5) after passing through a coupling with a safety valve (14) and then through a pressure reducer (15) and optionally a flow reducer (16), preventing the racing of the motor, and/or a flow meter (17) for example connected to a microprocessor computer (18),

   - a system (24) for a secondary product with a secondary pump (26) expelling the second product contained in a secondary tank (27) through the secondary product system,

   - the base product system (4) for the main product and the system (24) for the secondary product both leading to the same mixer (21) feeding the atomisation nozzle (8) under the control of the controlled valve (P₁),

   - the two pumps (6, 26) therefore obviously having outputs adjusted so as to match the proportions of the mixture to be produced and the main hydraulic circuit (10) having its action synchronised with that of the secondary hydraulic circuit (20),

   - this secondary hydraulic circuit (20), like the main hydraulic circuit, passing through a pressure reducer (2) and even through a flow reducer (23) preventing the racing of the motor (25) and/or a flow meter (28),

   - these two hydraulic circuits (10, 20) being for example fed by the same variable capacity pump (11) and placed under the control of the same safety valve (14),

      the installation being provided with means according to any one of Claims 4 to 8.

Images