DE1967061B2 - Flushing device for the mixing system of a device for spraying a mixture of liquid synthetic resin and a catalyst - Google Patents

Description

35

The invention relates to a rinsing device for the mixing system of a device for spraying a mixture of liquid synthetic resin and a catalyst, which are fed via separate supply lines to different sections of a mixing chamber having an outlet opening, the mixing system being connected to a rinsing solvent supply line which carries a rinsing solvent and which has a is assigned portion of the mixing chamber, the various of the resin supply conduit and the catalyst supply pipe associated with sections is the mixing chamber, and wherein the mixing ^w a control device for controlling the supply of the resin, the catalyst and the Spüllösungsmit- means of which the mixing chamber.

Such devices are used to apply synthetic resin-catalyst mixtures, which are usually harden very quickly. Therefore, it must be ensured in these devices that when terminating the Application of the mixture, the mixture present in the device without delay completely is carried out. If this is not guaranteed with such a device, there is a risk of that parts of the mixture harden in the gun, which makes time-consuming cleaning necessary or even makes the device unusable.

Such a device is known, which has a mixing chamber with a mixing rotor and a number valve actuated inlets for the material components having, these inlets for the individual components side by side in a wall of the Mixing chamber are arranged. A control lever is used to control the feed of the individual components provided, upon actuation of which a control line is acted upon with compressed air via a valve, wherein a pump and metering device through a further valve The individual components are put into action via separate lines of the gun feeds The control line can be depressurized through a further valve arranged in the control line be held so that no promotion of the individual components can take place.

Furthermore, a solvent line is provided in this known device, which is through its own, another valve is controlled. This known device now has the disadvantage that when interrupted Several steps are necessary for a spraying process. Since the operator usually the Spraying device rait with one hand, these hand movements can only be carried out with the other hand one after the other be carried out, which requires a certain time, so that with a delay between the Handles in the case of mixtures that harden very quickly, parts of the mixture are already in the spraying device can be cured. Another disadvantage is that in addition to the components to be mixed, too Rinse solvents can be fed to the spray device, rendering the mixture unusable. Finally, it is also disadvantageous that the rinsing solvent does not have all the inlets of the individual at the same time Components reached, so that there is a risk that smaller amounts of the components or the mixture can harden in the device and then no longer out of the device due to the detergent can be carried out.

It is also known to control the supply of the rinsing solvent with another, likewise pull-off type Provide control device. In this device, however, the solvent supply lines and the catalyst supply line is connected to one another by a common line, which is via a connecting line is in communication with a central section of the mixing chamber this performance that through the common connection line no satisfactory cleaning of the mixing chamber can be achieved, in particular because too Beginning of the cleaning process, initially with detergent mixed with the catalyst in the mixing chamber got. In this known device there is still the risk that the actuating device to control the supply of the solvent is erroneously operated, thereby undesirably Solvent is added to the resin-catalyst mixture.

Another known device is for controlling the supply of resin, catalyst and air a fume cupboard is provided, which can only be moved in one direction, with the successive supply of air, Catalyst and resin is released. In this device, however, none is fixed to the mixing chamber connected detergent line provided, but to clean the device, the catalyst supply line solved and the solvent line connected to the connection for the catalyst supply line.

The object of the invention is to provide a flushing device of the type mentioned at the beginning to develop that a quick and complete cleaning of the mixing chamber is made possible, wherein however, the supply of solvent into the mixing chamber during the application of the synthetic resin catalyst

tor mixture is prevented

This object is achieved in that the flushing solvent supply line is connected to that of the outlet opening opposite end of the mixing chamber is arranged that the Kunstharzzufuhrieitung and the Catalyst supply line diametrically opposed to each other in opposite directions, transversely to the Mixing chamber side walls extending side wall sections of the mixing chamber are arranged and that the tax performance has a deduction that is converted into a Direction is movable to control the supply of the synthetic resin and the catalyst to the mixing chamber, and which is movable in a different direction to control the supply of the flushing solvent to the mixing chamber.

In the device according to the invention is thus used in an advantageous manner, a single fume cupboard both for controlling the supply of the components to be mixed as well as for controlling the supply of the rinsing solvent, so that depending on the position of the Withdrawal from the mixing chamber only the components to be mixed or only the SpQ solvent can be fed. In addition, the device according to the invention is particularly simple Manageable way, since the change of the operating position of the device, namely the application of the mixture for cleaning or vice versa, only requires a single simple handle, which then he very can be done quickly.

In addition, the structural arrangement of the flushing agent supply line at the attachment opening the mixing chamber facing away from the end face of the mixing chamber always a complete and simultaneous Application of the mixture or the individual components ensured, as the flow of the rinsing solvent takes place in a straight line from the flushing solvent supply line to the discharge opening of the mixing chamber and the catalyst supply line and the synthetic resin supply line, which run essentially transversely to the direction of flow of the rinsing agent, simultaneously with the rinsing solvent can be achieved.

The invention is illustrated by way of example in the drawings

F i g. 1 is a schematic representation of a device for spraying a mixture of liquid Synthetic resin and catalyst,

F i g. 2 the synthetic resin pump and the catalyst pump with the lever device connecting them in a side view,

F i g. 3 a vertical section through the catalyst pump with air tank,

Fi g. 4 is a side view of the spray device;

F i g. 5 is a front view of the spray device according to FIG. 3.

F i g. 6 a cross section through the spray gun,

F i g. 7 an enlarged, perspective view of individual parts of the spray gun;

8 is a perspective view of another part of the spray gun,

F i g. 9 is a perspective view of the pulverized fiber discharge device. fao

It is common to use liquid synthetic resin, for example when Spraying paint, spraying it with a spray gun, using compressed air as the carrier for the Resin is used. Such a technique is used, for example, when spraying polyester resin. In In some cases the synthetic resin is mixed with reinforcing fibers. The difficulty with the technical Application of the synthetic resin consists in that the application of the synthetic resin takes place slowly and that is why the applied resin tends to form air bubbles. It is also known to be a mixture of synthetic resin such as polyester resin and a catalyst, who has the ability to cure the synthetic resin to spray with such a spray gun. It is however, it is not possible to stop the resin spraying for a long period without the To empty and clean the spray device, otherwise the synthetic resin connected to the catalyst in the Device would cure.

The device according to the invention is for applying a mixture of liquid synthetic resin, such as polyester resin, and a catalyst without using air as a carrier medium. Included the mixture of synthetic resin and catalyst is effected shortly before it emerges from the spray gun, so that, if the spraying is stopped for an extended period, the whole catalyzed one Resin can be flushed quickly and easily from the device. Also the event will be thereby facilitated that the mixture of the synthetic resin and the catalyst shortly before the exit from the Pistol takes place automatically

The device according to FIG. I consists of a synthetic resin container 1, a catalyst container 17, Supply lines 16 and 45 and a spray gun 2 with mixing system. The device is operated by a Support column 3 and a console 4 held. The support column is advantageous as a pneumatic or hydraulic one Piston-cylinder arrangement formed the console 4 when a pressure medium is supplied through a supply line 5 lifts. The starting position of the device can thus by moving the console along the Cylinder piston column can be changed.

A synthetic resin pump 6 extends with its lower end 7 into the synthetic resin container 1. The pump delivers the resin from the container to the pump outlet end 8. The pump is driven by a piston motor 9 driven, the medium under pressure, preferably air, is supplied through a supply line 10. the The pump can be controlled automatically by the back pressure in a synthetic resin discharge line 11, so that the Operation of the pump begins when the pressure in the outlet line falls below a predetermined value and the work of the pump continues until the pressure in the line is critical again Has reached the control value

The synthetic resin outlet line is connected to a needle valve 12 which regulates the flow of liquid and which is adjustable by means of a rotary knob 13 in order to keep the working pressure of the synthetic resin at a value between 15 and 40 kg / cm ² . From this needle valve, the resin flows through a common filter 14 and an air chamber 15. Since the resin pump 6 is a piston pump, it will pump the resin from the container 1 in waves. The air chamber 15 serves to smooth the waves of the synthetic resin flow so that the synthetic resin flows evenly from the air chamber through a line 16 to the spray gun 2 under a predetermined pressure

In order to bring the synthetic resin to be sprayed into the correct condition so that it can be used after application hardens it is necessary to mix the synthetic resin with: a suitable catalyst. A gas bottle or another container 17 contains the catalyst. The catalyst is from the container 17 via a Line 18 removed from a pump 19, whose

Structure is shown in detail in Fig.3. Of the Catalyst is generated by going up and down a pump plunger 22 with piston 23 from the container 17 pumped through the line 18 into a pump chamber 20 behind a check valve 21. When the piston 23 is moved downwards, the check valve 21 is activated by the pressure of the piston, which is on the Catalyst fluid in the pump cylinder 20 affects closed, so that the catalyst behind the Check valve comes into a bore of the piston 23, from which it passes through an opening 24 in the Piston rod is omitted.

In order to ensure reliable curing of the synthetic resin, a predetermined minimum must be The ratio of the catalyst to the synthetic resin must be given. To get a constant ratio of catalyst too To get synthetic resin is the catalyst and synthetic resin pump, both of which inevitably move, connected to the simple piston engine 9 and driven by it. Since the amount of catalyst in In relation to the amount of synthetic resin is very small, the pump 19 for the catalytic converter has a very much smaller one Capacity than the pump 6 for the synthetic resin. The pumps are also interconnected so that the The stroke length of the catalyst pump 19 is adjustable in at least one direction to the ratio of To be able to change catalyst to synthetic resin in the mixture injected from the device.

The stroke of the piston rod 22 of the pump 19 can be increased for a given stroke of the synthetic resin pump 6 Use of a pump structure as best shown in FIGS. 2 and 3 can be seen. That The upper end of the piston rod 22 is fastened in a block 25 between the spaced-apart transverse rods 26 of a lever actuating the pump is seated. The cross bars are on a pivot pin 27 on one Lever arm 28 is attached by a pivot pin 29 to a fixed arm 30 of the pump frame so that it can be rotated is anchored. The lower end of the pump 19 is attached to this arm by a pivot pin 31 Block 25 is relative to a pivot pin 32 which extends through slots 26 'in the cross bars 26 the cross bars 26 rotatably mounted. The length of these slots runs in the longitudinal direction of the cross bars 26.

The ends of the cross bars 26 remote from the lever arm 28 are through a pivot 33 attached to the piston rod 34 of the pump drive motor 9 as in FIG. 2 is shown as the hub of the Pump actuating rod 34 is constant and the pivot pin 27 of the cross rods 26 is substantially The stroke of the piston rod 22 of the catalyst pump can be fixed by moving the pivot pin 32 can be adjusted in one direction or the other along the slots 26 '. So becomes a movement of the pivot pin to the right (F i g. 2) the stroke length of the piston rod 22 of the synthetic resin pump at a given stroke length of the drive piston rod 34, while by moving the pivot pin 32 to the left (Fig.2) along the slots 26 'the The stroke length of the catalyst piston rod 22 increases Grab handle 25 'on block 25, and the block slides in one direction or the other of the crossbars.

From the pump 19, the catalyst is in a line 35, which is shown in FIG. 3 is omitted in the a check valve 36 is arranged to provide return flow to the pump cylinder during the downward movement of the piston 23 to prevent. The line 35 is connected to an outlet line 37, the one has a narrow bore 38. In order to avoid a wave-like flow, an air chamber 39 is on the outlet line arranged. A valve 40 is attached to the top of the air chamber to which an air supply is provided is connected to generate any desired air pressure in the air chamber.

In order to avoid that the pressure of the catalyst in the bore 38 by working the pump 19 is higher than

if necessary, a pressure relief valve pipe section 41 is arranged. The pipe section 41 has a passage 42 in which a check valve 43 sits. The check valve is opened when the pressure becomes too high. The catalyst that flows through the check valve is passed through a line 44 to the container i? returned

Since the amount of catalyst in relation to the amount of synthetic resin in the final mixture is very small Flow from the catalyst outlet line 37 through the catalyst supply line 45 to the spray gun 2 is relative small. In addition, the passage through the inflow line should be very small to allow for during spraying to prevent undulating movement of the catalyst flow to the spray gun, which would cause that the pressure in the catalyst supply line 45 drops suddenly.

Because the spray gun for spraying a synthetic resin and catalyst mixture is a considerable distance away for example, 10 m from the synthetic resin container 1 and catalyst container 17 should be suitable, it is difficult to provide a hose of such length with a very small cavity around the catalyst to feed. A hose of such length can form a loop so that the supply of the catalyst changes or is throttled and so the resin does not harden. Furthermore, it would be very difficult, if not be impossible to clean the cavity of such a hose. Instead of a catalyst supply hose With a narrow cavity, a hose 45 is therefore provided which has a relatively has a wide cavity and in which a flexible rod-like throttle piece 46 made of plastic is loosely arranged The catalyst must then be released from the outlet line 37 through an annular passage between the Inner wall of the hose 45 and the inserted throttle piece 46 to the spray gun 2 flow.

The details of the resin spray gun are shown in FIGS. 4-8 The liquid synthetic resin spraying agent is shown is discharged through a nozzle 47, whose

so the mouth can be shaped so that a more or less conically widening or flat jet arises

The resin feed line 16 brings the resin to a bore 48 in the nozzle head, and the catalyst feed line 45 brings the catalyst to a passage 49 in the nozzle head, as shown in FIG. 6 is shown A check valve 50 serves as a seal between the bore 48 and the resin supply pipe 16 to prevent the catalyzed resin from flowing back into the resin supply pipe. Accordingly, a check valve 5i is provided between the catalyst passage 49 and the catalyst supply pipe 45 to prevent that the synthetic resin provided with the catalyst flows into the catalyst supply line. The synthetic resin supply line 48 and the catalyst supply line 49 both open into a synthetic resin and catalyst mixing chamber 52.
It is important that not only the resin and the

Catalyst must be fed to the spray gun in a precise proportion, but it is also important that the resin and the catalyst mix completely in a homogeneous mixture, causing curing all parts of the resin can be done. The resin and catalyst mixture must therefore be used are splashed at the same time, so that the synthetic resin remains on the surface to which it is sprayed and the Tendency of the synthetic resin to collect in drops and run off on the surface, e.g. B. if the Surface is inclined, is reduced to a minimum. The first step is to put the catalyst in the resin to distribute. The second step is to mix the resin and catalyst and the third step is to to squirt this mixture.

In order to distribute the catalyst in the resin, the resin supply pipe 48 and the catalyst supply pipe are 49 aligned opposite in the gun body so that the resin and the Catalyst meet in countercurrent. Furthermore, the catalyst supply line 49 is in a bolt 49 ' drilled, which is screwed in so that the end of the The catalyst supply line extends approximately into the middle of the mixing chamber 52. The bolt 49 'is advantageous made of plastic material such as nylon, which opposes the catalyst and the synthetic resin The end of the bolt has a number of radial grooves 49 "which, as shown in FIG. 8, in FIG cut him so that the catalyst that flows through the bore 49 in the bolt, is diverted from the straightness with the bore and flows along the grooves in separate parts of the mixing chamber 52

From the mixing chamber 52, the mixture of synthetic resin and catalyst follows a tortuous path to nozzle 47 to give a complete mixture of the resin and catalyst. This path is due to the interaction of a number of obstacles between the mixing chamber and the nozzle developed. The obstacles are advantageously designed so that an obstacle has a peripheral passage and the adjacent obstacle provides a central passage for the resin mixture

The interacting obstacles are shown in detail in FIG. An obstacle 53 that for one peripheral resin mixing passage has a solid wall 54, from the periphery of which fingers 55 exit axially. The fingers are spaced apart and allow peripheral passage between them them from one to the other side of the wall 54. The other obstacle 56 has a wall 57, the one The wall 57 of the obstacle 56 can pass through a central passage 58 for the plastic mixture annular flange 59 are kept at a distance from the wall 54 of the adjacent obstacle 53. It is important that the radial thickness of the edge 59 is much smaller than the radial depth of the grooves between the Fingers 55 is to allow a peripheral flow from the recess in the edge 59 of the obstacle 56 through to allow the grooves. While in Fig. 6 one of the Obstacle 56 shown disposed between two obstacles 53 may be a number of Obstacles 53 and 56 are used in an alternating arrangement. Obstacles 53 and 56 are in alternating arrangement iin the bore near the nozzle 47 inserted The nozzle is removable and on End of the bore sealed by a gasket 60, which can be made of nylon, and with a screw cap 61, which has an opening to extend the nozzle. Distributing the resin through the nozzle is opened by pulling a trigger 62 from a position as shown in FIG. 4 by the solid line is indicated, to a position as indicated by the broken line to the left of the solid line Line shown is controlled. The trigger pivots about a pivot pin 63 relative to the socket body and Handle.

The pivoting of the trigger 62 causes a simultaneous movement of a valve rod 64 to a Resin control valve 65 open, and movement of valve rod 66 to open catalyst control valve 67 to open.

The simultaneous and coordinated reciprocation of the valve rods 64 and 66 is through Pivoting of a bracket 68 carried by the trigger 62 causes the support members for the two Bring valve rods 64 and 66 simultaneously in connection. The valve rod 64 is on a piston rod 69 mounted into which it is screwed. The valve rod is held in place by a lock nut 70. the Piston rod 69 is guided for the reciprocating movement relative to the gun body in that it is in a pipe section 71 is slidable back and forth. Correspondingly, the rod 66 of the catalytic converter valve is on the Piston rod 72 fastened by a screw connection and a lock nut 73 secures the parts their place. The piston rod 72 is slidable in a bore of a pipe section 74 which is in the gun body is screwed in

Springs 75, which lie in recesses 76 in the gun body, are supported against the piston rods 69 and 72 to cause the valve rod 64 and valve rod 66 to go to the right (Fig. 6) to move the Resin valve 65 and catalyst valve 67 to be held in the closed position when trigger 62 not from the position corresponding to the solid line in FIG. 4 has moved away when beyond the trigger 62 by the operator from a position in which he is following to the left of the extended position Fig.4 is pivoted is released, the force the spring over the piston rods 69 and 72 and the lock nuts 70 and 73 on the bracket rod 68, the is held by the trigger, so that the trigger in the extended position according to Fig.4 pivots back while the resin valve 65 and the catalyst valve 67 close at the same time.

If the spraying of the catalyzed resin is stopped for a long time, while the catalyzed resin has a tendency to harden in the mixing chamber 52, For example, the mixing chamber 52, the resin supply passage 48, the catalyst supply passage 49 and the passages from mixing chamber 52 to nozzle 47 are easily cleaned without disassembling the gun to have to. This cleaning is done by rinsing out the mixing chamber and the passages with it A synthetic resin solvent causes unwinding by simply pushing the trigger 62 forward instead of pulling backwards. The flushing solvent is stored in a container 77, from which it is brought to the gun body by compressed air via a solvent line 78 Compressed air is supplied to the reservoir 77 through an air supply line 78 '. The storage container and the connections to it are in FIG. 1 shown

The supply of the flushing solvent through the conduit

78 to the resin and catalyst mixing chamber 52 is controlled by a valve 79 which is located at the end of a Valve rod 80 is attached. At the other end of this rod, a head 81 is arranged, which is connected to the bracket 68 is in contact and, as shown in FIGS. 4 and 6 by pivoting the trigger 62 from position according to the solid line in FIG. 4 for the position of the broken line to the right of the solid line Line is printed to the right. Opening the valve

79 allows the solvent in the mixing chamber 52 to be rinsed, from which it flows through the synthetic resin feed line 48 to the check valve 50 and through the catalyst feed line 49 to the check valve 51 also flows through the meandering passage through the obstacles 53 and 56 to and in the nozzle is formed.

In some cases it may be desirable to use chopped reinforcing fibers, such as spun glass to apply the synthetic resin. The fibers are said to be in the same direction as the flow of the atomized Plastic, which is injected from the nozzle 47, lie so that the synthetic resin and the fibers are attached or mix before the fibers deposit on the surface. A device for crushing and Blowing out the shredded fibers can be attached to the spray gun 2, as shown in FIG. 9 is shown. In order to throw out the chopped fibers, the air passing through a conduit 84 (FIGS. 1, 4, 6 and 9) to the Gun body is brought, can be removed from a piece of pipe 83 on the gun body.

The air discharge from the pipe section 83 is controlled by a valve 85, which by longitudinal movement of a Valve rod 86 is opened. The movement is achieved by pivoting the trigger 62 from the position shown in FIG position shown by the solid line to the position shown by broken line to the left of the position shown by the solid line. The movement of the trigger 62 causes the Bracket 68 brought into contact with the adjacent end of valve rod 86 to open valve 85 To take position. When the valve is open, the air from line 84 behind the valve is through a opening 87 in the valve body to the pipe section 83 flow. When the pressure on the valve rod 86 is interrupted, a spring 88 will return the valve 85 to its closed position, to close off the air supply to the pipe section 83.

A representative fiber chopper is shown in Fig.9. It consists of a body 89 to which a rotating motor 90 is attached The motor drives chopper rollers 91, the blades of which are against rotating Support rubber support rollers 92. The glass web or other fibrous material 93 to be shredded becomes between the chopper rollers and the support rollers pulled through and the fiber material comminuted so that the chopped fibers 94 fall off and through the Rotational movement of the rollers 91 and 92 are thrown in one direction so that they are on the work surface or before the spray reaches the surface with the synthetic resin spray.

When the pistol trigger 62 is in the position of the solid line of FIG. 4 is located Resin supply valve 65, the resin passage check valve 50, the catalyst supply control valve 67, the catalyst gate check valve 51, the purge solvent supply valve 79, and the chopper air supply valve 85 all in closed position. Under these circumstances, both in the resin supply pipe 16 as well as in the catalyst supply line 45 a pressure of about 15 to 40 kg (200 to 600 psi)

ίο queue. There is also pressure in the flushing solvent supply line 78 and are present in the chopper air supply line 84. The pressure in the resin supply line serves to interrupt the operation of the pump motor 9.

When the resin is to be ejected, the trigger 62 is operated by an operator holding the handle of the pistol, in the left position shown by broken lines according to FIG. 4 drawn. Of the Of course, the operator can always operate the gun regardless of the spray direction. The trigger movement will open the resin valve 65 and the catalyst valve 67 at the same time, so that the pressure of the Resin and the catalyst press against the pressure of the check valves 50 and 51 and open them,

2c around the resin and the catalyst to the Let mixing chamber 52 flow. The resin and catalyst mixture is passed through the mixing chamber flow the meandering path and ejected from the spray nozzle 47. The delivery of with catalyst resin will last as long as the trigger is pulled

When a reinforcement fiber chopper 89 is attached to the spray gun, pulling the trigger will occur 62 also cause a supply of air to the chopper in the manner described, so that the chopped fibers mixed with the synthetic resin spray. When the trigger is released, the springs 75 become the Valves 65 and 67 close and the trigger 62 is moved to the position indicated by the solid line Return to Fig. 4. The forward movement of the Trigger the spring 88 will operate to move the valve 85 in the closed position, whereby the Air supply to the reinforcement fiber chopper is cut off.

If the application of the synthetic resin is to be interrupted for a noticeable time, the Trigger 62 simply to the right in FIG. 4 in the position of the broken line to the right of the position of swiveled in full line to lift the valve 79 from its seat, so that the flushing solvent through the resin and catalyst mixing chamber, the resin and catalyst supply lines of the gun and printing the passages from the resin and catalyst mixing chamber 52 to the nozzle so as to Dissolve and wash out all the synthetic resin provided with the catalyst from the gun. The trigger 62 is then released so that the spring 83 returns the valve 79 to the closed position and the supply of the flushing solvent is cut off. The gun is then simply released by pulling on the dent trigger again ready for an immediate resumption of work

For this purpose 3 sheets of drawings

Claims (1)

1
Claim: Rinsing device for the mixing system of a device for spraying a mixture of liquid synthetic resin and a catalyst, which are fed via separate supply lines to different sections of a mixing chamber having an outlet opening, the mixing system being connected to a rinsing solvent supply line which is assigned to a section of the mixing chamber, the different assigned by the resin supply conduit and the catalyst supply pipe sections of the mixing chamber, and wherein the mixer control means for controlling ^s> identifies the supply of the resin, the catalyst and the Spüllöiangsmittels to the mixing chamber, characterized in that the Spüllösungsmittelzufuhrleitung (78) on the the end of the mixing chamber (52) opposite the outlet opening (53) is arranged so that the synthetic resin supply line (48) and the catalyst supply line (49) are diametrically opposed to one another in e opposing side wall sections 2s of the mixing chamber extending transversely to the mixing chamber side walls are arranged and that the control device has a trigger (62) which is movable in one direction in order to control the supply of the synthetic resin and the catalyst to the mixing chamber, and that in another Direction *> is movable to control the supply of rinsing solvent to the mixing chamber.