CH632097A5 - Method and device for producing a binding agent constant in its mixture ratio - Google Patents

Description

632097 2

PATENT CLAIMS 15) or directly with the weighing container (1)

1. Connect the method for generating a line (30, 31, 32) connected in its mixture.

Ratio in the event of fluctuating demand for constant binder from 7. Device according to one of claims 4 to 6, characterized in that several components for further processing are characterized in that in the transducer (58) that of chipboard manufacture, with valves (10, 11, 12) and removal 5 load cells (5) coming electrical signals via a pump (13, 14, 15), each of which conveys one of the components to the measuring amplifier (100) of a voltage comparison unit (101) to a mixing vessel (19), characterized in that whose polarized output signals are fed to a chip-the extraction pumps (13, 14, 15) from a frequency converter (102) in terms of its speed with a device (108) for guiding the polarity of the signals according to the need for binding agents,

size-adjusted drive motor (43) with such drive outputs output signals are driven to a digital counter (105) in such a way that their delivery capacities are achieved, the output values of which are related to one another via a digital analog relationship, like the predefined converter (106) of the voltage comparison unit (101) again the mixing ratio of the components in the binder, are supplied, and on the other hand, the comparator (57; for a withdrawal pump (13) the motor speed and for each 68; 78) are fed, and that a device (108) for further Tapping pump (14, 15) the transmission ratio 15 suppression of the transmission of signals of a polarity motor speed / pump drive speed is provided accordingly.

poses; that successively separated from each of the weighing containers (1) designed as pre-8. device according to one of claims 4 to 7, thereby council containers (2, 3, 4), that in each comparator (57, 68, 78) Upstream and separately removable components with the downward counter (111) for the extraction pump assigned to it by a voltage fre- quent mass under weighing, a frequency converter (56,67,77) and by the measuring value converter (68), and thereby extracted from the The weighting of the weighing pulses is provided and the weighted signals derived from the forward / backward container (1) are connected to a conveyor (111) with a digital-to-analog converter (113), the output of the extraction pump by adjusting the motor and its analog output signals via a Multiplier (116) speed or the gear ratio is corrected; with the signals coming from a target adjuster (41) and that during the removal of a component and its 25 is linked directly.

Feeding to the mixing vessel (19) the other components 9. Device according to one of claims 4 to 8, characterized

via lines not connected to the weighing container (1), that a mixing device (30, 31, 32) is provided in the mixing container (19) from the device (20, 21) assigned to these components.

take pumps are fed directly to the mixing vessel (19).

2. The method according to claim 1, characterized in that 30

that during a filling process of the weighing container (1)

trained storage container (2,3,4) all components via the lines not connected to the weighing container (1)

(30, 31, 32) through the preset extraction pumps (13, 14, the invention relates to a method for producing a in 15) are fed to the mixing vessel (19). 35 its mixing ratio with fluctuating demand

3. The method according to claim 1 or 2, characterized in binders consisting of several components for the net, that a constant back pressure after the removal of the pump for further processing in the production of chipboard is maintained with valves (13, 14, 15). pumps and extraction pumps, each of which is one of the compo-

4. Device for carrying out the method according to Nenten to a mixing vessel, and a device claim 1, with a reservoir (2,3,4), valves (10,11,40 to carry out the method.

12). Withdrawal pumps (13, 14, 15) and a mixing vessel (19). Until now, attempts have been made to determine the mixing ratio of the binding

characterized in that the storage container (2, 3, 4) is to be kept constant by means of volumetrically combining the individual compo weighing containers (1) which supply electrical output signals to form a fleet. For this purpose, load cell (5) was assigned and each of the force measuring oval gear meters and piston metering pumps was used, but the electrical signal (5) coming out of the socket (5) has considerable disadvantages. An essential post-converter (58) to a selector switch (60, 69) as an actual value signal is part of a purely volumetric monitoring of the mixture, that a comparator (57, 68, ratio consists of the fact that 78) is present due to constant contamination , to which, via the selector switch (60, 69), the actual of the pipelines, for example or by damage to the value signal of the measured value converter (58) for comparison with components of piston metering pumps, a clear monitoring of a setpoint value assignment of the generation process associated with the respective component Binder is not nal applicable, and that the correction signal formed from this is guaranteed. Furthermore, when changing a first component to a speed controller (42) to correct the specific weight of the individual components, it was necessary to install a further device (13, 14) to correct the speed of the drive motor (43) for removing a binder , 15) and for each additional component, which also led to an increase in the failure of one of the adjusting motors assigned to it (52, 53) for readjusting the entire system. For example, included a compo whose extraction pump (14, 15) is installed. a lot of air as an emulsion, so it was

5. The device as claimed in claim 4, characterized in that, with a specific weight which is constant per se, there is a three-way valve (13, 14, 15) between the weighing container (1) and each removal by the piston metering pumps (13, 14, 15). 10, 11, 12) that instead of this component, only air was conveyed which was connected to a power 60 (30, 31 or 32) that was not connected to the weighing container (1), which led to a complete failure of the binder is. because this component could not be added. In particular

6. Apparatus according to claim 4 for carrying out the particular when the manufacture or production of the binding process according to claim 2, characterized in that the weighing container (1) and each extraction pump (13, in which Particleboard manufacturing fluctuating needs by -14.15) a three-way valve (10.11.12) was arranged and the 65 should be routed, the volumetric three-way valves (10.11.12) failed depending on the weighing manufacturing process.

container (1) arranged end contacts (85,86,87; 90,91,92) the object of the invention is therefore, in the case of a fluctuating weighing container (1), optionally with the extraction pumps (13, 14, need from individual components in its mixing ratio

ratio to produce constant binder. According to the invention, this object is achieved by the method characterized in claim 1 and the device for carrying out the method characterized in independent claim 4.

Due to the weight-based monitoring of all individual components for the production of binders, errors caused by, for example, changes in the specific weight or by segregation processes which cause degassing can no longer occur. In addition, a constant mixing ratio of the binder is achieved in the production of binders for the gluing of chip material even if the reference variable is derived from the belt weigher that feeds a gluing machine with chips.

By the measure, during the measuring process z. B. supplying components to the mixing vessel from a further source, a continuous mixing process is achieved in a particularly advantageous manner, which practically causes a constant and error-free mixed binder liquor.

In an embodiment of the subject matter of the invention, it is proposed that during a filling process of the storage container designed as a weighing container, all components are supplied to the mixing vessel via the lines not connected to the weighing container and via the preset extraction pumps. It is hereby achieved that the weighing container can be filled discontinuously without being able to have an adverse effect on the constant binder ratio.

In a further embodiment of the invention, it is proposed that a constant back pressure be maintained after the extraction pumps. Maintaining a constant back pressure ensures that pressure fluctuations caused by height fluctuations cannot have a detrimental effect on the mixing vessel and, on the other hand, that the extraction pumps themselves always work against a fixed, preset back pressure.

The device according to the invention for carrying out the method allows the binding agent to be produced from different components in terms of weight and a preselectable ratio of these individual components to one another by actuating a selector switch to always compare the respective component with the required setpoint during its withdrawal from the weighing container by weight so that after the end of the measuring process, which is done, for example, by switching to the next component, a precisely metered component is supplied to the mixing vessel even when the demand fluctuates.

In an embodiment of this measuring device, it is proposed that the electrical signals coming from the load cell are fed via a measuring amplifier to a voltage comparison unit in the measured value converter and their polarized output signals are fed to a voltage frequency converter with a device for taking into account the polarity of the signals. The output signals of the voltage frequency converter can be fed to a digital counter, the output values of which are fed back to the voltage comparison unit via a digital-analog converter, and can also be fed directly to the comparator. A device for suppressing the transmission of signals of one polarity can also be provided. With such a configuration, slight fluctuations in the weighing container can be fully controlled, so that incorrect measurements are not possible.

In yet another embodiment of the inventive measuring device, it is proposed that an up / down counter be provided in each comparator for the pulses coming from the voltage frequency converter and the measured value converter. The up / down counter can be used with a

632097

Digital-to-analog converter, the analog output signal of which is preferably linked directly via a multiplier to the signal coming from a setpoint. Using this comparator enables precise monitoring of the weight-weighted signal emitted by the load cell.

In yet a further embodiment of the subject matter of the invention, a device for carrying out the method with a storage container, with valves, extraction pumps and a mixing vessel is seen in the fact that a three-way valve is arranged between the weighing container and each extraction pump.

The provision of a mixing device in the mixing vessel ensures that even in the case of components which are difficult to emulsify, binder release can be ensured which, in addition to the constant metering of the individual components, also enables complete mixing and thus uniformity of the entire binder.

In a further embodiment it is proposed, particularly with regard to the interaction between the weighing container and the extraction pump, that the three-way valves connect the weighing container to the extraction pumps or direct lines, depending on the end contacts arranged in the weighing container. The arrangement of three-way valves provides the possibility of filling the weighing container at the same time and also the throughput to the mixing container. This ensures that the binder is produced continuously during the filling process, with a practically constant mixing ratio.

The invention is explained in more detail using the exemplary embodiments shown in the drawing.

Show it:

Fig. 1 is a schematic representation of a binder production to explain the inventive method

Fig. 2 is a block diagram of a transducer contained in an apparatus for performing the method

Fig. 3 is a block diagram of comparisons contained in the device.

A weighing container 1, which according to the number of components to be mixed in the exemplary embodiment is divided into a plurality of storage containers 2, 3 and 4, which are sealed off from one another, and which is in total on a load cell 5 as a weighing device, is connected by pipes 7, 8 and 9 via three-way valves 10 , 11, and 12 are connected to extraction pumps 13, 14 and 15, which are themselves connected via pressure holding valves 16, 17 and 18 to a mixing vessel 19 in which a mixer 21 driven by a motor 20 is arranged.

The three-way valves 10, 11 and 12 are connected by further lines 30, 31 and 32 to a further source, from which, for example, the individual components, bypassing the weighing container 1, directly via the extraction pumps 13, 14, 15 and the pressure control valves 16, 17, 18 can be supplied to the mixing vessel 19.

A command variable coming via a line 40, which can be the respective weighing values of a belt scale when gluing chip material, is fed via a quantity controller 41 to a speed controller 42 which is connected to a drive motor 43 which itself drives a countershaft 4. The extraction pumps 13, 14 and 15 are connected to the drive motor 43 via the countershaft 44 via intermediate drives 45, 46 and 47. It is shown in the exemplary embodiment that a withdrawal pump 13 is adjusted without a further transmission only by changing the speed of the speed controller, that is to say by means of the drive motor 43, as a function of the command variable coming via line 40. The drive motor 43 is, as stated, the

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Lead motor, while the extraction pump 14 and 15 through 31 and 32 from a source both the reservoirs 2,3 and

Correction gear 50 or 51 and adjusting motors 52 or 53 4 of the weighing container 1 are filled until the final contact

are also adjustable. clock 90,91,92 address, as well as the removal

The command variable will be acted upon by the speed controller 42 pumps 13, 14 and 15, so that the

Via a line 55 also a voltage frequency converter 5 pressure control valves 16, 17, 18 also the mixing during the filling process.

56 and a comparator 57 which is supplied from a measuring vessel 19 with the individual components with practically

value converter 58 can be fed via a line 59 and a selector switch constant mixing ratio. First

60 the weight-weighted impulses of the load cell 5 after switching off the inflow from lines 30, 31 and 32

receives. The command variable is also via the lines 55, through the limit switches 90, 91 and 92 in the weighing container

65 and a first setpoint adjuster 66 for the filling process to be corrected and a new measuring cycle can begin.

component a voltage frequency converter 67 NEN.

and a comparator 68 for this one to be corrected. The measured value converter 58 shown in FIG. 2 is supplied by the component, the comparator 68 via the finger output of the load cell 5 via a measuring amplifier 100 69 of the selector switch 60 connected to the measured value converter 58. an electrical voltage which can be linked to a voltage comparison, so that the weight-weighted impulses are supplied to the force 101 and, after amplification, are passed to one chip load cell 5 and to the comparator 68, in which the frequency frequency converter 102 can be passed on, in which way. The reference variable is finally taken care that the polarity of the incoming lines 55, 75 and a second setpoint adjuster 76 are taken into account for the signals. The output voltage from the component to be corrected to a voltage-frequency converter 102 is passed directly via a line 103 to a frequency converter 77 and to a comparator 78, 20 fed to the comparator 57 or 68 or 78 as a digital value which is also via the finger 69 of the selector switch 60 to the sensor 105, which delivers weight-weighted impulses of the load cell 5 and, on the other hand, via a line 104 to a digital counter, from which it can be connected as a function of the changing transducer 58. the value via a digital-to-analog converter 106 a

The voltage frequency converters 56, 67 and 77 as well as the equivalent value is created, which is connected via a line 107 to the

Comparators 57, 68 and 78 are fed back into the voltage comparison unit 2.3 25 in the storage containers. Exists between

and 4 stored components, so that the analog value of the measuring amplifier 100 and the digital

of the equality by adjusting the finger 69 of the selector switch 60 of the digital counter 105, the component selected via the line, the withdrawal and thus the feed 103 no pulse to the comparator 57 or 68 or 78.

to the mixing vessel 19 is corrected, namely in the shown, which is the end of the removal from the storage container.

Embodiment in which one component by the Ent 30 corresponds to 2 or 3 or 4. In the event of fluctuations or

take pump 13 only as a function of the target / actual contractions within the storage containers 2, 3, 4, it would be conceivable to be the same and from the fluctuations in the command variable, and in that pulse repetitions are passed on, so that one of the other two components is passed through the withdrawal pump - false impulse passed on to the respective comparator 57,68,78

pen 14 and 15 in addition to this depending on which is ben. To avoid this error,

the setpoint adjusters 66 and 76 selectable mass via the 351 58 a device 108 for suppressing the transmission

Adjustment motor 52 and 53. provided signals of one polarity, so that such

The position of the three-way valves 10, 11, 12 will not be able to be passed on based on the pulses. Should this

weight-weighted removal of the device in the storage container 2 are rendered ineffective, this can be explained in more detail by means of a hand-held component. If this control, not shown, is effected from the outside,

nente via line 7 of the extraction pump 13, so 40 which is of interest, for example, when the weighing

the three-way valve 10 is set by a motor 80, container 1 is to be loaded with new components.

that only a free flow from the storage container 2 to the comparator 57 or 68 or 78 shown in FIG. 3

Extraction pump 13 is present. Upon completion, this has an up / down counter 111, on one of which

The three-way valve 10 is measured by the motor input 140 by the voltage frequency converter 56 or 67

80 adjusted in such a way that a direct supply 45 or 77 coming as a pulse train arrives via line 30.

extraction pump 13 is counted with this component and at its other input 141 a pulse

det and this component is counted in sequence by the extraction pump 13 which corresponds to that from the measured value converter 58

such a mass is promoted, as corresponds to the course of the information above. Was determined by the function of the outgoing measurement. At this time, the up / down counter is digitized at its output 112

Now the component 50 tal located in the storage container 3 has a result pending on the digital analog wall.

via the three-way valve 11 of the extraction pump 14 fed 1er 113 is passed on. At the analog output 114 and weighted, while the three-way valve 12 by digital-to-analog converter 113, the voltage present there has been rotated by an adjusting motor 82 into such a position, as a correction voltage via a line to a multiplier that the extraction pump 15 is passed on via line 32 under reverse 116, which can simultaneously be loaded with the analog setpoint value of the load of the weighing container 1. Now shows 55 binder component via lines 118 or 119 or

one of the contacts 85, 86, 87, which is supplied in the partial containers 2, 3 and 4 120. At the output 121 of the multiplier 116

are arranged in such a way that a filling of the weighing container 1 is now due to a superimposition voltage, which now has to be carried out, the lines 130, 131 and 132 shown in FIG

Servomotors 80, 81 and 82 rotated the respective three-way valve 10, 11, the speed controller 42 or the adjusting motors 52 and 53 and 12 into such a position that the lines 30, 60 are passed on.

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3 sheets of drawings