DE1967063C3 - Mixing system for a device for spraying a mixture of liquid synthetic resin and a catalyst - Google Patents

Description

The invention relates to a mixing system for a device for spraying a mixture of liquid synthetic resin and a catalyst, consisting of a mixing chamber, which the liquid, from a Resin pump under pressure through a resin supply pipe and the resin supplied by a Catalyst pump takes up catalyst supplied under pressure through a catalyst supply line, wherein the resin supply pipe and the catalyst supply pipe face each other, opposite to each other open into the mixing chamber.

When spraying a mixture of liquid synthetic resin and catalyst, it is known that the Part of the amount of catalyst is only a fraction of the amount of resin. So is the relationship between Resin and catalyst in the order of 100: 1 weight units. However, since that Mixing ratio of the two components must be strictly adhered to, it is necessary that one Intimate mixing takes place and the relatively very small amount of catalyst evenly in the very much larger amount of resin distributed.

In order to achieve a good mixture, mixing systems are known in which the to be mixed with one another liquid components are fed in countercurrent to the mixing chamber. How, however, the practical Experience has shown that the mixing in the known mixing systems is not satisfactory if the mixing ratio is so extremely different as stated above.

The object of the invention is therefore to design a mixing plant of the type mentioned in such a way that the Components flowing into the mixing chamber meet as soon as they enter the mixing chamber and thereby an even distribution of the catalyst in the synthetic resin is given

The object is achieved in that the in the

Inner channel of the catalyst feed line opening into the mixing chamber is arranged in a hollow body, the end portion of which is at least half the width the mixing chamber protrudes into the mixing chamber in a direction parallel to the direction of the inner channel

With the help of the training according to the invention, even with extremely different mixing ratios an intimate mixing of the components is achieved, since the synthetic resin immediately after entering The catalyst is added to the mixing chamber and therefore an immediate even distribution of the Catalyst is given in the synthetic resin stream

According to an advantageous development, there are grooves in the end face of the end section of the hollow body arranged the radi ?! go to the inner channel to the outside and its inner groove opening into the channel flow out.

According to a further development, the hollow body is designed as a screw bolt, the end section of which is threadless
The invention is illustrated by way of example in the drawings. It shows

F i g. 1 a side view of the spray device,
F i g. 2 is a front view of the spray device according to FIG. 1,
F i g. 3 a cross section through the spray gun,

4 shows a perspective view of a hollow body the spray gun,

5 shows an enlarged, perspective view of individual parts of the spray gun.
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 that has the ability to harden the synthetic resin, spray with such a spray gun. However, it is not possible to spray the synthetic resin Interrupt for a longer period without emptying and cleaning the spray device, otherwise the resin bonded to the catalyst would harden in the device.

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 injection is interrupted for a longer period

Wi chen, the whole catalyzed one Resin can be flushed quickly and easily from the device. Also the event will be facilitated by the fact that the mixture of the synthetic resin and the catalyst shortly before the exit from the

'' "> Pistol takes place automatically.

According to FIGS. 1 to 3, the liquid synthetic resin spraying agent discharged through a nozzle 47 of a spray gun 2, the mouth of which can be so yeformt that

a more or less conically widening or flat beam is created

A resin supply line 16 brings the resin to a bore 48 in the nozzle head, and one Catalyst feed line 45 brings the catalyst to an inner channel 49 in the nozzle head (FIG. 3). A Check valve 50 serves as a closure between the bore 48 and the synthetic resin supply line 16 to prevent the catalyzed resin from flowing back into the resin supply pipe. Accordingly is a check valve 51 between the inner passage 49 and the catalyst supply line 45 provided to prevent the catalyzed resin from entering the catalyst supply line The bore 48, which is designed as a synthetic resin supply line, and that as a catalyst supply line, flows formed inner channel 49 both open into a synthetic resin and catalyst mixing chamber 52.

It is important that not only the resin and the catalyst be in proper proportion to the spray gun but it is also important that the resin and the catalyst are completely in one Mix homogeneous mixture so that curing of all parts of the synthetic resin can take place. the Synthetic resin and catalyst mixture must therefore be sprayed at the same time, so that the synthetic resin the surface it is sprayed on and the tendency for the resin to collect in droplets and to expire on the surface, e.g. B. when the surface is inclined, is reduced to a minimum. The first step is to distribute the catalyst in the resin. The second step is to put the resin and mix the catalyst, and the third step is to spray this mixture.

In order to distribute the catalyst in the synthetic resin, the bore is designed as a synthetic resin supply line 48 and the inner channel 49 designed as a catalyst supply line in the gun body opposite one another aligned so that the resin and the catalyst meet in countercurrent. Furthermore, the inner channel 49 drilled into a hollow body 30 which is screwed in so that the end of the catalyst supply line extends to approximately the middle of the mixing chamber 52. The hollow body 30 is advantageously made of plastic material, z. B. nylon made, which is insensitive to the catalyst and the synthetic resin. Of the End portion 31 of the hollow body 30 has a number of radial grooves 32 which, as shown in FIG. 4 is shown in are cut into it, so that the catalyst, which flows through the inner channel 49 in the hollow body, comes out the straightness of the inner channel is deflected and along the grooves in separate parts flows into the mixing chamber 52.

From the mixing chamber 52, the resin and catalyst mixture follows a tortuous path to the nozzle 47 to provide a complete mixture of the resin and catalyst. This path is created by the interaction of a number of obstacles between the mixing chamber and the nozzle. The obstacles are advantageously designed so that an obstacle rt ^a: .beralen passage and the adjacent obstacle gives a central passage for the synthetic resin mixture.

The cooperating 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 side of the wall 54 to the other. 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 It is important that the radial thickness of the rim 59 is substantially less than the radial depth of the grooves between the

ίο fingers 55 is to allow a peripheral flow of to allow the recess in the edge 59 of the obstacle 56 through the grooves. While in Fig. 3 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 in the bore near the nozzle 47 used 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 provided, which has an opening to extend the nozzle. The distribution of the synthetic resin through the nozzle is by pulling a trigger 62 from a position as shown in Fig. 1 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 nozzle 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.

i ^r> The simultaneous and coordinated reciprocation of the valve rods 64 and 66 is effected by pivoting of a bracket 68, which is carried by the trigger 62 to the holding parts for the two valve rods 64 and 66 at the same time in connection with

4 (i bring. 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

4 -> a pipe section 71 can be slid back and forth. Corresponding the rod 66 of the catalyst valve is fastened to the piston rod 72 by a screw connection, and a lock nut 73 secures the parts in place. The piston rod 72 is slidable in a

V) Bore of a pipe section 74 which is screwed into the gun body.

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 the

v, valve rod 66 to the right (FIG. 3) to keep the resin valve 65 and catalyst valve 67 in the closed position when the trigger 62 is not moved from the position shown in the solid line of FIG. 1 has moved away. If beyond

Wi the trigger 62 by the operator • in a position in which he moves to the left of the extended position shown in FIG. 1 is pivoted, is released, the force is the spring over the piston rods 69 and 72 and the counter-. nuts 70 and 73 on the bracket rod 68, the

'·' Is echoed by the trigger, transmitted so that the Trigger swings back into the extended position of FIG. 1, while at the same time the synthetic resin valve 65 and the catalyst valve 67 close.

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, may be the mixing chamber 52, the resin supply passage 48, the inner channel 49 and the passages from the mixing chamber 52 to the nozzle 47 are easily cleaned without having to take the pistol apart. This cleaning is done by rinsing out the mixing chamber and the passages are effected with a synthetic resin solvent. Unwinding can be done simply by pressing of the trigger 62 can be triggered forwards instead of pulling it backwards. The flushing solvent is in stored in a container, from which it is by compressed air via a solvent line 78 (Fig. 2) to Gun body is brought.

The supply of 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. 1 and 3 shown is by pivoting the trigger 62 from the position according to the solid line of FIG. 1 on the position of the the broken line to the right of the solid line is pressed 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

When the pistol trigger 62 is in the position of the solid line of FIG. 1, the resin supply valve 65, the resin passage check valve 50, the catalyst supply control valve 67, the catalyst passage check valve 51 and the purge solvent supply valve 79 are all in the closed position. Under these circumstances, both the synthetic resin feed line 16 and the catalyst feed line 45 will have a pressure of about 15 to 40 kg / cm ² .

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. 1 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 against the pressure of the check valves 50 and 51 pushes and this opens to to flow the resin and the catalyst to the mixing chamber 52.

The resin and catalyst mixture will flow from the mixing chamber through the winding path and discharged from the spray nozzle 47. The supply of catalyzed resin will be like this long as the trigger is pulled.

If the application of the synthetic resin is to be interrupted for a noticeable time, the Trigger 62 simply to the right in FIG. 1 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 pushing the passages from the resin and catalyst mixing chamber 51 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 82 returns the valve 79 to the closed position and the supply of the flushing solvent is cut off. The gun is then simply by pulling the trigger again ready for an immediate resumption of work.

1 sheet of drawings

Claims (3)

Patent claims: 1. Mixing system for a device for spraying a mixture of liquid synthetic resin and a catalyst consisting of a mixing chamber, which takes the liquid from a synthetic resin pump Pressure of resin supplied by a resin supply pipe and that of a catalyst pump takes up catalyst fed under pressure through a catalyst feed line, the Resin supply pipe and the catalyst supply pipe facing each other, opposite each other open into the mixing chamber, characterized in that the inner channel (49) opening into the mixing chamber is the Catalyst feed line (45) is arranged in a hollow body (30), the end section (31) of which at least up to half the width of the mixing chamber (52) in the direction parallel to the direction of the inner Channel protrudes into the mixing chamber 2. Mixing plant according to claim 1, characterized in that in the end face of the end portion (31) of the hollow body (30) grooves (32) are arranged, which radially from the inner channel (49) go to the outside and their inner groove openings open into the channel. 3. Mixing plant according to one of claims 1 or 2, characterized in that the hollow body as Screw bolt (30) is formed, the end portion (31) of which is threadless.