RS59996B1 - Dispensing device and metering system for metered release of chemical substances stored in packs to a dishwasher or washing machine - Google Patents

Description

The invention relates to a system for dosing chemical substances, contained in packages, into dishwashers or laundry machines, which includes at least one dispenser.

Such dosing systems can be used in commercial (industrial) kitchens or laundries.

Dispensers that can be found on the market are powered from the mains, include a central logic that is placed directly in the dosing device and that controls the dosing of substances from the dispenser itself, then inlet and outlet valves, an inflow for dissolving and/or mixing the substance with water, a line for discharging the substance and a sensor, such as a conductivity sensor, located in a dishwasher or washing machine, which measures conductivity and released chemical substances. The user interface in the form of a screen and buttons are located on the housing of the dosing device, which is connected to the central logic. The outlet opening on the package of the chemical substance is connected to the inlet opening of the dosing device, whereby the package is placed directly on the dosing device, the content of the substance in the package is determined according to the shape of the outlet opening on the package with the help of a miro switch.

Document DE 19652 733 AI shows a dispenser for dispensing chemical substances, which are stored in a package, of a dishwasher, wherein the control logarithm doses the amount of the substance based on the conductivity of the substance.

Document DE 102008 033238 AI describes a package for dosing a chemical substance into a washing machine, wherein the package has an RFID tag that contains information about the contents of the package itself.

The basis of this invention is, first of all, the task of devising an improved algorithm for the release of chemical substances, by which the dosing of the substance is more accurate than before, which results in improved washing processes in dishwashers or laundry machines while simultaneously reducing the consumption of the substance. This improved algorithm so that the actual conductivity of the mixture of the released substance and water in the dishwasher or washing machine, which is professionally called the washing or rinsing liquid, approaches the desired conductivity of the mixture of the substance, released from the dispenser, and water in the dishwasher or washing machine. The control algorithm, as control parameters, contains a previously determined standard value of the conductivity of the substance, a previously determined standard value of the conductivity of the water to be supplied, the actual basic conductivity of the supplied water, a previously determined standard value of the hardness of the water to be supplied, the actual value of the water hardness, an equalizing factor of the standard conductivity of the substance for deviations between the standard hardness of the water and the actual hardness of the water, as well as an adjustable correction factor, whereby the desired conductivity of the substance is calculated according to the following formula:

Desired conductivity of the substance = correction factor x (standard conductivity of the substance - standard conductivity of water - actual conductivity of water) x equalizing factor (actual hardness of water - standard hardness of water)

The standard conductivity of a substance is the conductivity expressed in µS, which the mixture of the released chemical substance and water showed during the manufacturer's testing in a dishwasher or laundry machine, whose washing or rinsing performance is marked as normative.

The standard conductivity of water is the conductivity expressed in µS of water mixed with the substance during testing.

Standard water hardness is the hardness expressed in °dH of the water mixed with the substance during testing.

The actual water conductivity value in µS is the conductivity of the water supplied from the dosing device.

The actual water hardness value in °dH is the hardness of the water supplied from the dosing device.

The corrective factor is set by the technician, so it is possible to adjust the dosage on the spot according to needs, for example when it comes to old or machines in poor condition or when pre-washing is not required.

The equalization factor represents an increase by °dH and shows by which factor the dosage of the substance should be increased with increased water hardness in order to obtain good washing or rinsing results.

The equalizing factor is, for example, very important when the dosed substance is a detergent that contains two different components, one of which is the alkaline component responsible for the quality of the wash, and the second component is the sequestrant responsible for cation binding, because only then can the detergent be effective.

With the equalization factor, more detergent will be dosed in case of higher water hardness in order to achieve a sufficient amount of sequestrants in the mixture of water and rinse aid, the so-called rinse liquid.

The control algorithm of the logic unit of the dispenser achieves particularly good results when it is set as a Fuzzy logic controller.

Package recognition on conventional dosing devices using microswitches has proven to be unreliable for everyday use. Another problem with the proposed control algorithm is that it uses parameters that are variable and substance-dependent. Therefore, it would be desirable if the substance-dependent parameters could be automatically and not manually entered into the control algorithm of the dispenser logic unit. In order to solve this problem, the invention proposes that the dosing device has an RFID reader next to the inlet line for the substance, whereby the RFID reader would be placed so that information from the RFID tag on the package itself could be read, the information should carry the identification of the substance such as the product and country code and data about the substance itself such as the standard conductivity of the substance, the standard basic conductivity of the water to be added to the substance, the standard hardness of the water to be added to the substance and the equalization factor for the standard conductivity of the substance for deviations between standard and actual water hardness.

In a further aspect of the invention, a dosing system solution is proposed with a package containing a chemical substance to be added to a dishwasher or washing machine, wherein the package includes an outlet opening connected to the inlet opening of the dosing device, wherein the package includes an RFID tag with the identification of the substance and identification data such as the standard conductivity of the substance, the standard conductivity of the water to be added to the substance, the standard hardness of the water to be added to the substance and the equalizing factor for the standard conductivity of the substance for deviations between standard and actual water hardness.

With known dosing systems, it has proven to be problematic that the voltage supply is located directly in the dosing device. In the event of a puncture or leakage of water from the water supply lines or the substance in the housing of the dosing device, a short circuit can occur that can destroy the central logic and endanger people. In the event that the central logic fails, the operation of the complete dosing system is blocked.

There is a risk that the user interface cable will be bent or torn if the dispenser housing is opened again.

In order to overcome this difficulty, the invention also proposes to integrate the dosing device into an innovative system for dosing the content of chemical substances contained in packages into dishwashers or washing machines, wherein the dosing system includes the control logic of the machine for controlling the operations of the dishwasher or washing machine as well as a user interface that includes a screen and buttons. The dispensing system is characterized by a modular structure, whereby the logic unit of the dispenser located in each dispensing device is separate from the logic unit that can be installed in the dishwasher or washing machine, whereby the logic unit of the machine communicates with the sensors in the dishwasher or washing machine and controls and manages the pumps, motors, control commands, and optionally the heater in the dishwasher or washing machine, whereby the logic unit of the machine converts the mains voltage to low voltage, more precisely 12 or 24 volts of direct voltage, whereby at least one logical unit of the dispenser and the logical unit of the machine are interconnected by a bus for supplying electricity and transmitting data, which includes lines for supplying electricity with low voltage, produced in it, communication lines for transmitting data between at least one logical unit of the dispenser and the logical unit of the machine.

The main difference between the innovative dosing system and existing systems is decentralization

system logic and modular system design. Now each dosing device and each unit has its own logic with independent tasks such as managing the dosing of the substance, filling the tank, etc. The units are powered by the low voltage generated by the power supply unit via the power and communication bus and therefore no mains voltage is required. Information is forwarded to other parts of the system via the main bus.

According to one way of implementing this invention, the user interface is configured as a unit, spatially separated from the dosing device and the logical unit of the machine, which is connected to the bus for power and data transmission.

For scalability, maintenance and monitoring of the innovative dosing system, it is convenient if the units, connected to the power and data bus, are configured as a master-slave system in which one unit, preferably the user interface, is defined as a higher-level control system that manages the other units. The logic unit of the machine transmits the measured values of the sensor, with which it is connected, to the logic unit of the dispenser.

The advantages arising from the structure of the dosing system according to the present invention are as follows:

Expanding the system at will, other components can be easily added to the bus.

The performance of the dosing system can be ideally adapted to the appropriate dishwasher, whether it is a cup washer or a large conveyor belt washer. The same applies to washing machines.

Minimized cabling and installation costs, as signals or relevant measured values are taken and processed directly where they originate. For example, the signal states are measured, digitized and processed directly in the dishwasher.

Additional devices, such as a central dosing device or an interface module for communication, can be easily integrated without changing the basic system.

In the event that a unit in the system fails, the other units remain functional; it is possible to set up redundant systems.

Certain system units can be used in other systems, e.g. user interface in the washing machine dosing system.

In order to dissolve the chemical substances in the packages with water, especially if the substance is in the form of a tablet, solid powder or diluent, according to one embodiment of the present invention, the dosing device includes a water supply controlled by the logical unit of the dispenser by means of a valve or a pump. In the water supply, ideally, a water meter is installed that communicates with the logical unit of the dispenser, and which delivers information about the actual consumption of water, on the basis of which it is possible to draw a conclusion about the deficit of certain substances.

For example, a substance that exists in the form of a compressed powder block (tablet) in a package may be defective if a large amount of water is required to wash the substance from the package.

For an optimal washing result, achieving low water consumption and uniform consumption of substances, it is useful that the logic unit of the machine includes a temperature sensor, which communicates with the tank of the dishwasher or washing machine, while the logic unit of the dispenser starts dosing the substance only when the liquid in the tank reaches a predetermined minimum temperature or exceeds it.

Regulation of the dosed intake of the substance in the dosing device can be accelerated if, on the way of the substance through the dispenser, the dispenser itself includes a conductivity sensor that measures the conductivity of the released chemical substance, i.e. released mixture of substances and infused water. With this configuration, the logical unit of the dispenser is immediately available information about the change in conductivity value, necessary for regulation. In particular, it is possible to immediately detect the discharge of the substance from the package, changes in the composition of the mixture of the substance with added water or excessive concentration of the substance in the dispenser, and appropriate measures can be taken, while, on the other hand, when measuring the conductivity exclusively in the dishwasher, information about the change in conductivity reaches the logic unit of the dispenser with a delay.

To increase electrical safety, the dispenser logic unit and the machine logic unit are sealed watertight. Electrical connections are available via protected waterproof boxes, preferably with reversed polarity, where the electrical connections, especially those electrical connections that have a voltage above the 50 V limit, are optoelectrically and galvanically isolated and separated.

According to this invention, the dosing system enables a personal computer, laptop, tablet or similar device to be connected to the bus for power supply and data transmission, on which it is possible to implement the monitoring, maintenance and configuration program of the dosing system. According to an additional innovative modification of the dosing system, it is possible to connect a remote maintenance module to the power and data bus.

In order to place only one hose in the washing machine when using several dosing devices at the same time, it is preferable that the outlet for the substance on the dispenser includes a connector for connecting to the outlet on another dosing device.

The invention is described in more detail below based on examples of implementation with reference to the drawings.

Sl. 1 schematically shows the method of realization of the innovative modular dosing system.

Sl. 2 shows a graph of the algorithm used in dosing regulation.

First, Fig. 1 schematically shows the implementation of the innovative modular system for dosing chemical substances, contained in packages 24, 25, into the dishwasher 4. The dosing system includes a user interface 1, which serves the user and the technician as a device for entering and giving commands in order to manage and configure the system. The user interface 1 has a screen 10, buttons 11 for control and two bus connectors 12, 13 for powering the user interface 1 and for communication via the bus for power supply and data transfer with other components of the bus.

Furthermore, the dosing system contains a dispenser 2 for releasing a chemical substance 24b in the form of a cleaning agent, concentrated in a powdery tablet, which is washed out of the package 24 with water. The electrical logic unit 22 of the dispenser, built into the dispenser 2, controls and regulates the ripening device 2. The logic unit 22 of the dispenser is connected to sensors such as the conductivity sensor 2f and the water meter 2e, as well as to the valves 2d and the optional pump, all of which are located in the dispenser 2. The logic unit 22 of the dispenser is connected to the bus for power supply and data transmission by means of two bus connections 14, 15 that serve for power supply and communication with other components of the bus. The dosing device 2 includes the water line 2c for flushing the substance 24b. The water line is controlled by the logic unit 22 of the dispenser via the valve 2d. A water meter 2e is installed in the water supply system 2c, which communicates with the logical unit 22 of the dispenser. Furthermore, the logic unit 22 of the dispenser measures the electrical conductivity of the mixture of washed cleaning agent and water, by means of the conductivity sensor 2f, located at the exit opening 2b of the substance.

The dosing system also includes a second dispenser 3 for dosing the chemical substance 25b in the form of a liquid from the package 25.

The packaging 25 is connected by its outlet 25a to the inlet 3a of the substance of the device 3 for dosing. Depending on the type of liquid, it is carried directly through the inflow line 21 and the spray arm 26 into the dishwasher 4 or through the connecting line 33, connected to the outlet 2b of the substance on the first dispenser 2, and further through the connecting hose 20 all the way to the tank 32 of the dishwasher 4. Second device 3 for dosing is constructed very similar to the first dispenser 2. It also has a built-in electronic logic unit 23 of the dispenser that regulates and controls the device 2 for dosing. The logic unit 23 of the dispenser is connected to sensors, such as the conductivity sensor 3f, placed on the exit opening 3b of the substance, as well as to the valves 3d for controlling the fluid flow. The logical unit 23 of the dispenser is connected to the bus for power supply and data transmission via two bus sockets 16, 17, which serve for power supply and communication with other components on the bus.

The machine 4 for washing dishes, depending on the implementation, can be a small machine for washing glasses, or as shown in Fig. 1 a machine with a cover or a large machine with a moving belt. In the dishwasher 4, a logical unit 31 of the machine is installed, which has an adapter 31a for power supply, which converts the mains voltage into a low voltage, in particular 12 volts or 24 volts direct voltage. The logic unit 31 of the machine supplies low voltage to all components of the dosing system via the main bus. The logic unit of the machine 31 disposes of the incoming information 29, 30 of the sensor, which records the status values, e.g. of magnetic valves 27, motor 28, temperature (liquid temperature sensor 35), amount of water, limit switches, etc. The logic unit 31 of the machine disposes of incoming information from the El-E3 sensor for e.g. filling, washing and re-rinsing functions. The dishwashing machine 4 comprises a tank 32 containing a washing liquid (= a mixture of water with substance 24b, 25b released from the dosing devices 2 and 3), which is pumped in circularly via the motor 28, which drives the pump, and via the spray arm 26. To measure the concentration of the substance 24b, 25b in the washing liquid, a conductivity probe 34 is installed in the tank 32, which is connected to one of the two main sockets 18, 19 via the main line 9 and thus communicates with the logic unit 31 of the machine.

All components in the dosing system are connected using cables 5, 6, 7, 8, 9.

The bus for power supply and data transmission is implemented as an RS485 bus.

The logic units 22, 23 of the dispenser and the logic unit 31 of the machine have a built-in microcontroller each and have an RS485 bus interface, in this case a voltage converter for 5 V and 3.3 V, program memory, non-volatile data storage, RAM and potential-free inputs and outputs.

A real time clock (RTC-Real Time Clock) can also be provided, and optionally a screen and buttons. The logic unit 22, 23 of the dispenser and the logic unit 31 of the machine are waterproof. Its electrical connections can be accessed via boxes and/or plugs that are waterproof and preferably polarity resistant.

According to this embodiment, the user interface 1 is spatially separated from the dosing device 2, 3 and the logical unit 31 of the machine. According to an alternative embodiment, the user interface 1 can also be integrated into the dosing devices 2, 3.

The units connected to the power and data bus, namely the user interface 1, the ripening devices 2, 3 and the logical unit 31 of the machine are configured as a master-slave system, with the user interface 1 as the master controlling the other units. According to an alternative implementation, it could e.g. and logical unit 31 of the machine to be configured as master, and user interface 1 as slave.

The control algorithms 22a, 23a of the logic units 22, 23 of the dispenser function as described in detail above and are configured as a Fuzzy logic controller. Two separate algorithms are implemented in the fuzzy logic controller. The first algorithm determines the stability of the determined real conductivity of the substance and is based on information about the type of dishwasher, e.g. a machine with a cover or a large mass with a conveyor belt, but also depending on the size of the machine, the possibility of installing the connecting hose 20 and the conductivity probe 34, the positioning of the suction at the motor 28 of the water pump and the dynamics, a more or less inert mixing system is created in the rinsing liquid. In order to achieve a good regulation in this inert system, the Fuzzy logic controller regulates the difference between the desired conductivity of the substance and the actual conductivity of the substance only if it has determined that the actual conductivity of the substance is stable enough. This determination is made by starting from the current moment, calculating the mean value always from the last (e.g. 16) measured values of the actual conductivity of the substance and determining the width of the range, which is a% (e.g. 10%) above and b% (e.g. 10%) below the mean value. If the y (eg 10) values of the last x measurements, used to form the average, are within the limits, then the actual conductivity of the substance is considered stable enough. The rate of occurrence is, for example, 1 measurement / sec. This procedure is shown in the graphic in Fig. 2

The second algorithm in the Fuzzy logic controller takes care of the amount of substance to be dosed.

This is done based on the test dose dosing duration, which has a certain time value "X", eg 250 ms. After the new actual conductivity of the washing liquid is stabilized, from the difference between the desired conductivity and the actual conductivity, the required duration of the release of the substance is calculated using the final calculation. This allows for very precise dosing and the precise achievement of the desired conductivity of the substance. As this works with each dosing procedure, all changes in water pressure, temperature, substance concentration and the level of the substance in the package are taken into account.

Each dispenser 2, 3 includes an RFID reader 2h, 3h near the entrance opening 2a, 3a for the substance, which can read information from the RFID tags 24c, 25c, printed on the packages. This information contains the identification and specification of the substance, such as the standard conductivity of the substance, the standard conductivity of the water added to the substance, the standard hardness of the water added to the substance and the equalizing factor for the deviation of the standard conductivity of the substance between the standard water hardness and the actual water hardness. The information, read by the RFID reader 2h, 3h, is transmitted to the control algorithm 22a, 23a, which takes it into account as a regulatory parameter during regulation.

Claims (17)

Patent claims: 1. Dosing system for dosed release of chemical substances, contained in packages (24, 25), into a machine (4) for washing dishes (4) or a washing machine, a device (2, 3) for dosing with an inlet opening (2a, 3a) for the substance, which can be connected to an outlet opening (24a, 25a) on a package (24, 25) containing a chemical substance, e.g. a cleaning agent, a product for disinfection, water treatment or rinsing agent, wherein the dosing device comprises an outlet (2b, 3b) of the substance, which can be connected to a dishwasher or washing machine, from which the substance is discharged, and with a logic unit (22, 23) of the dispenser containing a control algorithm (22a, 23a), which regulates the dosing of the discharged chemical substance (24b, 25b), wherein the regulatory algorithm (22a, 23a) doses the release of the chemical substance (24b, 25b) so that the actual conductivity of the mixture of the released chemical substance and water in the machine (4) for washing dishes or laundry approaches the desired conductivity of the mixture of the released chemical substance and water. characterized by: the regulatory algorithm (22a, 23a) adjusts the desired conductivity of the substance by taking into account, based on the values measured by the conductivity sensor (2f, 3f) in the logic unit (22, 23) of the dispenser, the previously determined standard conductivity value of the substance, the predetermined standard conductivity value of the water to be supplied, the actual conductivity value of the supplied water, the previously determined hardness of the water to be supplied, equalizing the factor for the standard conductivity value in case of deviations between standard water hardness and actual water hardness, as well as an optional, adjustable correction factor as a regulatory parameter, whereby the desired conductivity of the substance is first calculated according to the following formula: desired conductivity of the substance = correction factor x (standard conductivity of the substance - standard conductivity of water actual conductivity of water) x equalizing factor (actual water hardness - standard water hardness) 2. The dosing system according to claim 1, characterized in that the regulatory algorithm (22a, 23a) of the logic unit (22, 23) of the dispenser is configured as a Fuzzy logic controller. 3. Dosing system according to claim 2, indicated by the fact that the Fuzzy logic controller determines the stability of the determined actual conductivity value of the substance, taking into account the values measured by the sensor (2f, 3f) for conductivity and only then equalizes the difference between the desired conductivity of the substance and the actual conductivity of the substance if it has established that the actual conductivity of the substance meets the stability criterion, whereby the determination of the stability of the actual conductivity of the substance is carried out by calculating, starting from the current moment, the mean value of the last X of the measured values of the actual conductivity of the substance and determine the width of the range that is a% above and b% below the mean value, and then check that the measurements used to form the mean y value (x > y) lie within the width of the range, which is considered to satisfy the stability criterion. 4. Dosing system according to claim 2 or 3, characterized in that the Fuzzy logic controller calculates the dosage of the chemical substance (24b, 25b) to be released, based on the duration of the test dose, including the conductivity values, measured by the sensor (2f, 3f), by calculating the difference between the desired conductivity of the substance and the actual conductivity of the substance using the final calculation of the duration of the release of the test dose in relation to the necessary duration of the actual release of the substance. 5. Dosing system according to one of the previous requirements, indicated by the fact that the dosing device has an RFID reader (2h, 3h) near the entrance opening of the substance, which can read information from the RFID tags (24c, 25c), printed on the package (24, 25), wherein it is preferable that the information is the identification of the substance, such as the product and country code and the specification of the substance, e.g. standard conductivity of the substance, standard conductivity of the water to be supplied to the substance, standard hardness of the water to be supplied to the substance and the equalizing factor for the standard conductivity of the substance in case of deviation between the standard water hardness and the actual water hardness. 6. The dosing system according to claim 5, characterized in that the dosing system includes a package (24, 25) containing a chemical substance (24b, 25b) for discharge into a dishwasher or a washing machine, wherein the package includes an outlet opening (24a, 25a) that can be connected to an outlet opening (2a, 3a) of the substance on the device (2, 3) for dosing, wherein the package (24, 25) has an RFID tag (24c, 25c) that contains the standard conductivity of the substance and, if applicable, additional information on the identification of the substance, such as the product and country code, and the specifications of the substance, such as the standard basic conductivity of the water to be supplied to the substance, the standard hardness of the water to be supplied to the substance, and an equalization factor for the standard conductivity of the substance for deviations between the standard water hardness and the actual water hardness. 7. Dosing system according to one of claims 1 to 5, indicated: logical unit (31) of the machine for controlling the operation of the dishwasher or washing machine; user interface (1) with screen (10) and buttons (11); wherein the dosing system has a modular structure, wherein the logic unit (22, 23) of the dispenser, contained in each dispenser (2, 3), is spatially separated from the logic unit (31) of the machine which can ideally be installed in the machine (4) for washing dishes or laundry, whereby the logic unit (31) of the machine communicates with the sensors (34) in the washing machine or laundry and monitors and controls the pumps (27), motors (28) and control commands (E1-E3), and optionally also a heater of a dishwasher or laundry machine, wherein the logic unit (31) of the machine includes a power supply unit (31a) that converts electricity from mains voltage to low voltage, especially 12 volts or 24 volts, wherein at least one logic unit (22, 23) of the dispenser and the logic unit (31) of the machine are connected by means of a bus for power supply or data transmission, which includes low power supply lines voltage, which occurs in the aggregate, as well as lines for transmitting data between at least one logical unit of the dispenser and the logical unit of the machine. 8. Dosing system according to claim 7, characterized in that the user interface (1) is configured as a unit, spatially separated from the device (2, 3) for dosing and the logical unit (31) of the machine, which is connected to the bus for power supply and data transmission. 9. Dosing system according to claim 7 or 8, characterized in that all units (1, 2, 3, 31), connected to the bus for power supply and data transmission, are configured as a master-slave system, in which one unit, preferably the user interface (1), is defined as a higher-level regulator that controls the other units. 10. A dosing system according to one of claims 7 to 9, characterized in that the logic unit (31) of the machine transmits the values measured by the sensors (34, 35) to which it is connected, to the logic unit (22, 23) of the dispenser. 11. Dosing system according to one of claims 7 to 10, characterized in that the dosing device (2, 3) includes a water supply (2c) controlled by a logic unit (22, 23) by means of a valve (2d) or a pump, so that the chemical substance, contained in the attached package, is dissolved in water or mixed, whereby a water meter (2e) is installed in the water supply that communicates with the logic unit of the dispenser. 12. Dosing system according to claim 11, characterized in that the logic unit (31) of the machine includes a liquid temperature sensor (35) that communicates with the tank (32) of the dishwasher (4) or washing machine, wherein the logic unit (22, 23) of the dispenser activates the dosing of the substance only when the liquid in the tank (32) reaches or exceeds a predetermined minimum temperature. 13. Dosing system according to one of the claims 7 to 12, characterized in that the dosing device (2, 3) includes a conductivity sensor (2f, 3f), placed on the path of the substance through the dosing device, which measures the conductivity of the chemical substance to be released, i.e. the mixture of the substance with the delivered water. 14. Dosing system according to one of claims 7 to 13, characterized in that the logic unit (22, 23) of the dispenser and the logic unit (31) of the machine are closed in a watertight manner, and their electrical connections are accessible via watertight, preferably polarity-resistant sockets and/or plugs, wherein the electrical connections are preferably optoelectronically or galvanically separated. 15. Dosing system according to one of claims 7 to 14, characterized in that a computer, especially a personal computer, laptop or tablet, can be connected to the bus for power supply and data transmission, on which programs for monitoring, maintenance or configuration of the dosing system can be implemented. 16. The dosing system according to one of claims 7 to 15, characterized in that a module for remote maintenance of the dosing system can be connected to the bus for power supply and data transmission. 17. Dosing system according to one of claims 7 to 16, characterized in that the outlet opening (2b, 3b) of the substance on the dosing device includes a connection to the line (33) of the outlet opening of the substance on another dosing device.