DE19735622C1 - Sealing machine for glass insulating panes - Google Patents

Abstract

The sealing machine fills the edge joint with a viscous or paste sealing mass consisting of a main component and a secondary component which differ chemically and in viscosity. Two pumps (3,6) supply the components from two tanks (1,2) to separate intermediate stores (5,8). There are two separate synchronously driven volumetric dosing pumps (14,19) to supply the components in a preset ratio to a mixer (16) and on to a jet (17). The jet, the mixer and the intermediate store form a group which can move as a whole on a mounting on the machine.

Description

The invention relates to a machine with the in the preamble of the claim 1 specified characteristics. Such a machine is known from DE-AS-39 37 900. The known machine is used to seal an insulating glass pane one of two components (main component and secondary components) best adhesive and sealing compound. Each of the two components is marked with an egg gene pump pumped from a barrel into a buffer. The two storage tanks are designed as piston pumps and feed gear pumps, which feed the two components to a static mixer, on the There is a nozzle at the end. There is even an arrangement for the main component voltage provided by two successive gear pumps. The arrangement Piston pumps and gear pumps are stationary and arranged via heated pressure hoses and heated articulated pipes with the arrangement Mixture and nozzle connected to the edge of an insulating glass pane  leaves for the purpose of sealing. These lines make a considerable difference pressure loss and require in view of the high viscosity (250-400 Pas) of the components extremely high pressures up to 400 bar at the outputs of the pumps. This has further disadvantages: stretching in the lines and the compressibility of the masses to be conveyed cause metering inaccurately keiten; the structural parts that are exposed to the mass flow are subject to egg increased wear; this applies in particular to gear pumps and can be used for the two-component adhesives used for sealing on insulating glass slices are commonly used due to drastic abrasive fillers be tightened that the lifespan is insufficient.

To avoid wear on the gear pumps, it is known to be two Component adhesives and sealants for sealing insulating glass panes instead, with the help of piston pumps (DE-A-37 03 929), which be fed from an intermediate storage, which in turn from a barrel pump fed from a storage container (barrel) for the respective components will. In this case, too, are the hydraulically driven piston pumps arranged stationary and feed the arrangement of mixer and nozzle via be heated pressure hoses or heated joint pipes with the ones already described Disadvantages for the dosing accuracy. The arrangement of the piston pumps, Intermediate storage and the hydraulic drives weigh approx. 600 kg and can impossible to move together with a nozzle.

From DE-A-39 13 000 it is already known to provide a buffer container for a to arrange highly viscous, pasty, compressible substance close to a nozzle, which this substance is fed from the buffer container. Dosing the However, substance is not volumetric, but pressure-dependent, by the Substance, for example, by means of a stationary piston pump Buffer container is conveyed through to the nozzle, in the buffer container under one constant regulated pressure is set, which in the area between the Pufferbe container and the nozzle requires a pressure sensor that is part of a  Pressure control loop. The disadvantage here is that fluctuations in the material composition, temperature and viscosity, the degree of crosslinking of 2-component mixtures etc. lead to metering inaccuracies that one pressure-controlled dosing are inherent.

EP-0 709 144 A1 describes a device with the features of the Oberbe handles of claim 1 known, in which as a buffer for the respective Component is a container, which is separated by a membrane in two chambers is divided, one of which is used to hold the relevant component serves and the other by means of a hydraulic pump as a volumetric metering Pump is pressurized with hydraulic fluid, which in the container flowing hydraulic fluid a corresponding amount of the concerned Component of the sealant displaced. The two separate ones, for the two components of the sealing compound provided intermediate container are controlled by one and the same hydraulic pump via separately controlled Pro portional valves acted on with the hydraulic fluid. The cache can be done together with the proportional valves, with the mixer and the nozzle can be arranged on a common support, but not for the dosing process required hydraulic pump, which is arranged stationary and is connected to the proportional valves via a hydraulic hose. A The disadvantage of this known device is that the control valves are not in are able to accommodate the rapid changes in the delivery rate of sealant to execute precisely enough in the required speed. Another Problem consists in the fact that the required high extrusion pressure with low conveyance is difficult to adhere to (EP 0 445 101 B1).

From FR-2,597,025 A a device for applying a strand is made described a one-component adhesive on a workpiece, which a Piston pump that is driven by a motor via a spindle drive becomes. There is pressure on the cylinder of the piston pump in the area in front of its chamber sensor provided. To the amount of adhesive emerging from the nozzle  control, the speed of the motor on the FR-2,597,025 A is controlled by a control tion to the desired value.

Further disadvantages of those known from EP 0 709 144 and DE-37 03 929 A1 Devices consist in that the hydraulic unit, which the dosing pumps drives, while the devices are in operation must be switched, so that even when no insulating glass pane ver is sealed, energy is used, heat is generated and noise is developed. Au In addition, the amount of components, which are before the respective funding member of the metering pumps (the piston in a piston pump or the Membrane in the storage container according to EP 0 709 144 A1) variable where due to the boundary conditions for dosing and the dosing accuracy of the current amount of components between the nozzle and the conveyor depend, which is particularly disadvantageous for the tougher main component, because this typically accounts for about 90% of the sealing compound and on top of that in the usual use of a thiokol as a sealant is tixotropic.

The invention has for its object a machine of the beginning to create the kind with which when filling the edge joint of insulating glass the amount of sealant emerging from the nozzle in the unit of time mass can be controlled more precisely and more quickly.

This object is achieved by a machine with the specified in claim 1 characteristics. Advantageous developments of the invention are the subject of subclaims.

According to the invention, the sealing compound is used for the tougher main component a gear pump driven by a servo motor as a metering pump used where, however, for the less tough secondary component of the Versiege a plunger pump is used as the metering pump, the plunger  is driven by a second servo motor. Both dosing pumps are included synchronized and including their drives and the associated Zwi Schenspeicher together with the nozzle and the mixer to form an assembly summarized, which is movable as a whole on the frame of the machine is brought.

The combination of features according to the invention has significant advantages:

• - The combination of nozzle, mixer, metering pumps and the them organized caching to an assembly that moves as a whole is attached to the machine, enables the shortest cables and ge least volume of material on the way from the metering pumps to the nozzle, wel when sealing insulating glass panes along the edge joint is moved.
• - The short cable routes and the small amount of material contained therein have the consequence that despite the high toughness of the components to be promoted te the delivery pressures can be so low that a hydraulic unit for dosing is no longer necessary, which in turn is the first step creates conditions for that the metering pumps and the associated Buffer with the mixer and the nozzle to move together union module can be summarized. The cache themselves are not opposed to this, since they do not contain any more material than is required to seal an insulating glass pane. The Spei amount can even be less if you ensure that the intermediate Refilled the memory during the sealing of an insulating glass pane can be. For this purpose the buffer is for the tougher Main component preferably a piston-cylinder unit, the piston under a relatively low pressure of not more than 20 to 30 bar stands, which does not have to be applied hydraulically, but pneuma table can be applied. Contrary to this form, the tough one  Main component from its reservoir running into the cylinder of the Kol ben-cylinder units are refilled. For this purpose, one can the refilling pump by two position sensors (position scarf ter) control, one to a forward position of the piston and one responsive to a rear position of the piston. The front position switch is arranged so that it responds when the cylinder is almost empty, and the rear position switch is arranged so that it responds when the Zylin that is almost full. If the front position switch responds to the piston, the pump, which is the tougher main component from the reservoir refilled, switched on, the rear position switch responds, the pump pe switched off again.
• - In this way, the gear pump can meter continuously and he also keeps from the piston-cylinder-ag that serves as a buffer gregat another form, which achieves a high dosing accuracy favored.
• - Since the secondary component is only on the order of 1/10 of the amount of ver sealing compound, it suffices to store the Ne to use the cylinder of the plunger pump itself, so that a separate buffer for the secondary component is unnecessary. This makes the dosing device for the secondary component particularly easy and compact.
• - The amount of sealing compound moved by the metering pumps is ver relatively low. This enables rapid changes in the funding rate where through the quality of the sealing of insulating glass panes verbes be and increase the sealing speed. On changes in Cross section of the edge joint to be filled can be faster according to the invention be reacted to than in the prior art. Another advantage of the low Amount of sealing compound between the dosing units and the nozzle  is that only relatively low pressures for pressing of the components are needed. Normally pressures from 150 to are sufficient 200 bar, whereas pressures of up to 400 bar occur in the prior art could. This not only enables a lighter design and weaker, more responsive drives, but also reduces the harmful impact the compressibility and the tixotropy on the dosing accuracy.
• - Regardless of the filling level of the intermediate storage, the amount of drying up is solution mass between the dosing units and the nozzle practically constant, so that the dosing accuracy is practically independent of the degree of filling of the Zwi memory.
• - Faster response times result in the start of the seal a steady state delivery rate is reached quickly. A previous one Pressure build-up, as it is common in hydraulic metering pumps, is fiction according to not required.
• - The particularly accurate and responsive mode of operation of the invention he enables the sealing compound to be calculated according to a previously calculated time-changing need or according to one by sensor, wel feel the edge joint of the insulating glass pane, determined the need to dose ren, whereas in the state of the art largely with empirical values had to be reckoned with because the dosing process had unpredictable influences sen was defeated.

• -

Since the dosing is purely volumetric, temperature fluctuations do not influence the dosing process, unlike in the prior art. A temperature-controlled cabin, which is common in the prior art to switch the temperature influence on the dosing accuracy, is not required according to the invention.

• - The higher reaction speed of the dosing units enables this also a faster end of the dosing process.
• - Since the transition phases between the stationary dosing process and the The start and stop (the so-called ramps) are shorter Phases also the mixing ratio between major and minor components te can be kept constant more easily.
• - To the pumps and delivery lines from the storage tanks to the two no special requirements have to be made or that the pressure is sufficient to place the components in the intermediate feed to promote.
• - With the electric servomotors, not only the delivery rate, but also the mixing ratio of the components is also easy and reproducible change. For hydraulic piston pumps, changing the Mixing ratio a mechanical change of lifting joints. For gear pumps that work in the state of the art with high delivery pressure a defined change in the mixing ratio was difficult riger because the delivery rate of the delivery pressure, the viscosity and the form depend on the pump.
• - Because of the lower delivery pressure, the gear pump is worn less than in the prior art. Abrasive ingredients, which in the Ne can be included, bring no wear problems with itself because the plunger pump used for its dosing wears out is insensitive.

Further advantages and features of the invention result from the following the description of an embodiment.  

Fig. 1 shows a metering device according to the invention partially in section, and

Fig. 2 shows in detail the arrangement of metering pumps, Zwischenenspei cher, mixer and nozzle of Fig. 1 enlarged in section.

The device consists of a first barrel 1 for the main component and a second barrel 2 for the secondary component of a sealing compound for insulating glass panes, preferably based on thiokol (a polysulfide). From the barrel 1 , the main component is promoted by means of a barrel pump 3 , the construction of which is known in the prior art, through a pressure hose 4 into an intermediate storage 5 . From the barrel 2 , the secondary component is pumped through a pressure hose 7 by a pressure hose 7 into a second buffer 8 by a drum pump 6 , the structure of which is also known in the prior art.

The intermediate storage 5 for the main component is the cylinder of a piston-cylinder unit 9 , into which the main component is pumped by the piston 10 , which has one or more passages 11 for this purpose. In the intermediate store 5 , the main component is under a pre-pressure, which is exerted by two pneumatic piston-cylinder units 12 and 13 by acting on the piston 10 . Immediately before the outlet of the intermediate store 5 , a gear pump 14 is provided, which is driven by a controllable servo motor. The output of the gear pump 14 is connected directly or via a very short line section 15 to a static mixer 16 , which opens into a nozzle 17 , with a rotary slide valve 18 being provided between the static mixer 16 and the nozzle 17 , which permits it to shut off the nozzle 17 .

The barrel pump 6 pumps the secondary component through a pressure hose 7 into the second intermediate storage 8 , which is the cylinder of a plunger pump 19 , the plunger 20 of which (plunger) is attached to a spindle 21 which is inserted in a spindle nut which is in a Gear housing 22 is housed and driven by a controllable servo motor 23 . The plunger 20 passes through a wiper seal 24 at one end of the cylinder 8 . At the opposite end of the cylinder 8 is the inlet for the secondary component, which is fed via a check valve 25 and a rotary valve 26 . At the side of the plunger pump 19 there is its outlet, which is connected by a line 27 to the inlet of the static mixer 16 , with another rotary valve 28 located close to the static mixer.

To fill the buffer 8 , the drum pump 6 is switched on; it för changes the secondary component through the open rotary valve 26 and through the check valve 25 open in this direction in the cylindrical Zwischenenspei cher 8th The degree of filling in the intermediate store 8 can be derived from the position of the plunger 20 , which is monitored for this purpose by two position sensors 29 and 30 , which control the pump 6 . The plunger is almost in its front end position, the position sensor 30 responds and switches on the pump 6 . During the following refilling process, the plunger 20 is moved back, preferably by the spindle 21 being decoupled from the servo motor 23 , so that the plunger 20 is pushed back by the secondary component flowing in via the pressure hose 7 . If the plunger 20 has almost reached its retracted end position, the position sensor 29 responds and switches the pump 6 off again. Such a refill process can take place between the sealing of two successive insulating glass panes. Short-term refilling processes can also take place when the nozzle 17 arrives at a corner of an insulating glass pane and the sealing process is briefly interrupted there. For metering the secondary component, the servo motor 23 drives the plunger 20 in the cylinder 8 in a controlled or regulated manner and displaces a defined volume of the secondary component, which flows through the line 27 into the static mixer 16 . The gear pump 14 is driven synchronously with the motor 23 and promotes a defined volume of the main component from the intermediate store 5 into the static mixer 16 , the conveying process of the gear pump 14 being supported by the prevailing pressure in the intermediate store 5 . Comes the piston 10 in the vicinity of its front end position, a position sensor 31 assigned to it responds and switches on the barrel pump 3 , which now, while overcoming the prevailing pressure in the intermediate store 5 , replenishes the main component in the intermediate store, the piston 10 receding. If the piston 10 comes close to its rear end position, another position sensor 32 responds and switches the drum pump 3 off again. In this way, the main component can be dosed without interruption. The rotary valves 18 , 26 and 28 can be shut off during breaks in operation.

The arrangement of the nozzle 17 , the static mixer 16 , the gear pump 14 together with the buffer 5 assigned to it and the plunger pump 19 with an integrated buffer 8 form an assembly which can be arranged on a common carrier and can be moved together when the Nozzle 17 is moved along the edge of an insulating glass pane, where this assembly is movably mounted on the frame of a sealing machine, is movable up and down there and at least the nozzle is also pivotally mounted, as is described, for example, in EP 0 709 144 A1 In the case of a machine for sealing insulating glass, which is part of the prior art, is described, to which reference is hereby expressly made.

Claims (12)

1. Machine for filling the edge joint of insulating glass panes with a viscous to pasty sealing compound, which consists of a main component and a secondary component, which differ chemically and in their toughness, with two pumps ( 3 , 6 ), which the two components convey from two storage containers ( 1 , 2 ) into separate buffers ( 5 , 8 ),
and with separate, volumetrically metering, synchronously driven metering pumps ( 14 , 19 ), which convey the components in a predetermined quantity ratio into a mixer ( 16 ) and further to a nozzle ( 17 ), the nozzle ( 17 ), the mixer ( 16 ) and the buffers ( 5 , 8 ) belong to a subassembly, which as a whole is movably attached to a frame of the machine,
characterized by a gear pump driven by a servo motor ( 14 ) as a metering pump for the main component in combination with a plunger pump ( 19 ) as a metering pump for the secondary component, the plunger ( 20 ) of which is driven by a second servo motor ( 23 ), which together belong to a movable assembly. 2. Machine according to claim 1, characterized in that the plunger ( 20 ) of the plunger pump ( 19 ) via a spindle gear ( 21 , 22 ) is driven. 3. Machine according to claim 1 or 2, characterized in that the cylinder of the plunger pump ( 19 ) serves as a buffer ( 8 ) for the secondary component. 4. Machine according to one of claims 1 to 3, characterized in that the reservoir ( 2 ) for the secondary component associated pump ( 6 ) conveys the secondary component directly into the cylinder of the plunger pump ( 19 ). 5. Machine according to one of claims 1 to 4, characterized in that the reservoir ( 1 ) for the main component associated pump ( 3 ) directly supplies the main component in the gear pump ( 14 ) th intermediate store ( 5 ), which tightly in front the input of the gear pump ( 14 ). 6. Machine according to claim 5, characterized in that the intermediate store ( 5 ) for the main component is under a pre-pressure. 7. Machine according to one of the preceding claims, characterized in that the buffer ( 5 ) for the main component is continuously refilled bar. 8. Machine according to one of the preceding claims, characterized in that the intermediate store ( 5 ) for the main component is a piston-cylinder unit. 9. Device according to one of the preceding claims, characterized in that the gear pump ( 14 ) is arranged immediately before the entrance of the Mi shear ( 16 ). 10. Device according to one of the preceding claims, characterized in that the plunger pump ( 14 ) is arranged immediately before the entrance of the Mi shear ( 16 ). 11. Device according to one of the preceding claims, characterized in that the intermediate store ( 5 ) for the main component is arranged directly in front of the gear pump ( 14 ). 12. Device according to one of the preceding claims, characterized in that the nozzle ( 17 ) is arranged immediately after the outlet of the mixer ( 16 ).