DE1967062B2 - Device for mixing liquid synthetic resin with a liquid catalyst - Google Patents

Description

The invention relates to a device for mixing liquid synthetic resin with a liquid catalyst and for discharging the mixture, consisting of mutually independent piston pumps for charging the mixing chamber under pressure with the synthetic resin and the catalyst, their piston roughly parallel direction to each other are movable, wherein the pistons of the synthetic resin pump along a predetermined, fixed line is reciprocable, and which are connected to each other by a lever, the longer arm on the larger resin pump and its shorter arm on the smaller catalyst pump is articulated and which has a slot extending in the longitudinal direction of the lever, in which a Pivot pin for changing the gear ratio of the lever is guided so that it can be moved and fixed is.

In a known device of this type, the piston rods of the two pumps with the Ends of the lever are connected, during the pivoting movement of the lever a circular movement, whereby the piston rods are pulled out of their axially parallel direction and thereby the Cant the piston within the cylinder assigned to it. However, it will be a sufficient game provided between the trunnions of the lever and the pumps connected to it, then changes as the lever moves back and forth, the effective length of the lever arms between the two pumps τ constantly, so that there is no constant transmission ratio. This results in very different Mixing ratios often result in blends that are either too fast or too slow or faulty not harden at all.

The object of the invention is therefore to provide a device to propose the mixing of liquid synthetic resin with a liquid catalyst, the bsi more space-saving Construction even with very different proportions of the components to be mixed a constant mixing ratio is guaranteed.

The object is achieved according to the invention in that the lever articulated at one end to the synthetic resin pump has a swivel joint at its other end and is connected to the catalyst pump arranged between the swivel joint μ and the synthetic resin pump, that at a distance below the lever a on the pump frame Resin pump seated, transverse to the direction of movement of the piston of the resin pump, fixed arm is arranged that a 2 ^r > articulated strut is arranged on the side of the catalyst pump facing away from the resin pump at a distance and approximately parallel to the direction of movement of the reciprocating piston of the pumps, that one end of the articulated strut is connected to the fixed arm by a pivot pin and the other end of the articulated strut is connected to the pivot joint and that the catalyst pump is pivotably connected to the fixed arm by a pivot pin.

The advantageous design of the device i ^r > achieves better guidance of the pistons in the cylinders assigned to them, which in particular avoids jamming.

The invention is illustrated by way of example in the drawings. It shows

• to Fig. Ί a schematic representation of a device for spraying a mixture of liquid synthetic resin and catalyst,

F i g. 2 the resin pump and the catalyst pump with the lifting device connecting them viewed from the side,

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

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

F i g. 5 shows a front view of the spray device according to FIG <> Fig. 3,

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

7 shows an enlarged, perspective view of individual parts of the spray gun;

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

9 is a perspective view of the extension device for shredded fibers.

It is common to use a spray gun to apply liquid synthetic resin, for example when spraying paint W), using compressed air as a carrier for the synthetic resin. Such a technique is for example used when spraying polyester resin. In some cases, the synthetic resin is made with reinforcing fibers mixed. The difficulty with the technical μ application of the synthetic resin is that the Application of the synthetic resin is slow and that therefore the applied synthetic resin tends to Air bubbles to form. It is also known to be a mixture

of synthetic resin such as polyester resin and a catalyst capable of curing the synthetic resin to be sprayed with such a spray gun. However, it is not possible to suspend spraying of the resin for an extended period, without emptying the spray device, and z * * clean, otherwise the resin associated with the catalyst would harden in the device.

The device according to the invention is for applying a mixture of liquid synthetic resin, like polyester resin, and a catalyst without using air as the middle of the carrier! suitable. Included the mixture of synthetic resin and catalyst is effected shortly before it emerges from the spray gun, so that, if the spraying is interrupted for a longer period chen, the whole catalyzed resin quickly and easily also the device can be rinsed. The discharge is also facilitated by the fact that the mixture of the synthetic resin and the catalytic converter takes place automatically shortly before it exits the »o gun.

The device according to FIG. 1 consists of a synthetic resin container 1, a catalyst container 17, supply lines 16 and 45 and a spray gun 2 with a mixer. The device is held by a 2 ~> support column 3 and a console. 4 The support column is advantageously designed as a pneumatic or hydraulic piston-cylinder arrangement which lifts the console 4 when a pressure medium is supplied through a supply line 5. The starting position of the device w can thus be changed by moving the console along the cylinder-piston column.

A synthetic resin pump 6 extends with its lower end 7 into the synthetic resin container 1. The pump delivers the synthetic resin from your container to the pump outlet J ^r > de 8. The pump is driven by a piston motor 9, the medium under pressure, preferably air, through a Feed line 10 is supplied. The pump may be automatically controlled by the back pressure in a Kunstharzauslaßleitung 11 so that the w action of the pump begins when the pressure in the outlet conduit below a predetermined value decreases, and the work of the pump is continued until the pressure in the Line has reached the critical control value again. «

The resin outlet line is connected to a fluid flow regulating needle valve 12 which is adjustable by a knob 13 to maintain the resin working pressure between 15 and 40 kg / cm ² (200 to 600 psi) from which needle valve flows the resin 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 ^r > 5 stream, so that the synthetic resin flows evenly from the air chamber! flows 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 state so that it hardens after application, it is necessary to mix the synthetic resin with a suitable catalyst. A glass bottle or other container 17 contains the catalyst. The catalyst is removed from the container 17 via a conduit 18 by a pump 19 whose b ^r> configuration is shown in detail in Figure 3. The catalyst is pumped up and down by a pump lung 22 with piston 23 from the container 17 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 closed by the pressure of the piston, which acts on the Ka'alysatorfiüssigkeit in the pump cylinder 20, so that the catalyst comes after the check valve into a bore of the piston 23, from which it is discharged through an opening 24 in the piston rod.

In order to ensure reliable curing of the synthetic resin, a predetermined minimum must be Ratio of catalyst to synthetic resin must be given. To get a constant ratio of catalyst too To get synthetic resin is the catalyst and Ki'jist resin pump, both of which are inevitably moving, 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 Dei a given stroke of the resin pump 6 Using a pump structure as best seen in Figures 2 and 3 can be varied. That The upper end of the piston rod 22 is fastened in a block 25 between the spaced transverse rods 26 of a lever actuating the pump is seated. The cross bars are on a pivot pin 27 on one Mounted lever arm 28, which is rotatable by a pivot pin 29 on a fixed arm 30 of the pump frame is anchored. The lower end of the pump 19 is attached to this arm by a pivot pin 31. Of the 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 shown in FIG. Since the hub of the Pump actuating rod 34 is constant and the pivot pin 27 of the cross rods 26 is substantially is fixed, the stroke of the piston rod 22 of the catalyst pump can be adjusted 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 stroke length of the catalyst piston rod 22 increases. To move the pivot pin 32 is a handle 25 'on the block 25, and the block slides in the one or another direction of the cross bars.

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 a 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 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.

To avoid that the pressure of the catalyst in ■> the bore 38 rises higher than necessary due to the operation of the pump 19, a pressure relief valve pipe section 41 is provided arranged. The pipe section 41 has a passage 42 in which a check valve 43 is seated. The check valve opens when the pressure becomes too great. The u> catalyst flowing through the check valve will returned to the container 17 through a line 44.

Since the amount of catalyst in relation to the amount of synthetic resin in the final mixture is very small, the ii 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.

Since the spray gun should be suitable for spraying a synthetic resin and catalyst mixture at a significant distance of 2 ^r > for example 10 m from the synthetic resin container 1 and catalyst container 17, it is difficult to provide a hose of such a length with a very small cavity to supply the catalyst . A hose of this length can form a loop so that the supply of the catalyst changes or is throttled and so the synthetic resin does not harden. Furthermore, it would be very difficult, if not 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 wide cavity and in which a flexible rod-like throttle piece 46 made of plastic is loosely arranged. The catalyst must then flow 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.

The details of the synthetic resin spray gun are shown in FIGS. The liquid synthetic resin injection -si medium is discharged through a nozzle 47, the mouth of which can be shaped so that a more or less conically widening or flat jet is created.

The resin supply line 16 brings the resin to a bore 48 in the nozzle head, and the catalyst supply line 45 brings the catalyst to a passage 49 in the nozzle head, as in FIG. 6 is shown. 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 catalyst passage 49 and the catalyst supply pipe 45 is provided to prevent the catalyzed resin from entering the catalyst supply line The resin supply pipe 48 and the catalyst supply pipe 49 both open into one 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. Tuesday Synthetic resin and catalyst mixture must therefore be sprayed at the same time, so that the synthetic resin a of the surface it is sprayed on and the tendency of the synthetic 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 artificial material. The second step is to apply the resin unc mixing the catalyst and the third step is spraying this mixture.

In order to distribute the catalyst in the resin, the resin supply pipe 48 and the catalyst are used supply line 49 aligned in the gun body gegenlie lowing so that the resin and dei Catalyst meet in countercurrent. Furthermore, the catalyst supply line 49 is in a bolt 49 drilled in, which is screwed in so that the end de catalyst supply line to about the middle de Mixing chamber 52 is enough. The bolt 49 'is advantageously made of plastic material, e.g. B. Nylon, manufactured as; is insensitive to the catalyst and the synthetic resin. The end of the bolt has a number of radial grooves 49 "cut into it, as shown in FIG. 8, so that the catalyst, de flows through the hole 49 in the bolt, is deflected from de straightness with the hole and de mixing chamber 52 flows along the grooves in separate parts.

From the mixing chamber 52, the mixture of synthetic resin and catalyst follows a winding path to nozzle 47. to give a complete mixture of resin and catalyst. This path is due to the interaction of a number of obstacles between the mixing chamber and the nozzle developed. Advantageously, the obstacles are ausgebil det 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 is provided has a solid wall 54, from the periphery of which fingers 55 exit axially. The fingers are spaced from one another and allow a peripheral passage between them them from one to the other side of the wall 54, the other obstacle 56 has a wall 57 that 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 in front of the recess in the edge 59 of the obstacle 56 through to allow the grooves. While in FIG. 6 one of the obstacles 56, which is between two obstacles 53 is shown arranged, a number of obstacles 53 and 56 may be arranged in an alternating manner to be used. The obstacles 53 and 56 are alternately arranged in the bore near the Nozzle 47 inserted The nozzle is removable and at the end of the bore through a seal 60, which is made Can be nylon, sealed and provided with a screw cap 61 which is used to extend the nozzle The distribution of the resin through the nozzle is achieved 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 nozzle body and> Handle.

The pivoting of the trigger 63 causes a simultaneous movement of a valve rod 64. by one Resin control valve 65 open, and movement of valve rod 66 to open catalyst control valve 67 in to open.

The simultaneous and coordinated reciprocation of the valve rods 64 and 66 is effected by pivoting a yoke 68 carried by the trigger 62 to bring the halves for the two valve rods 64 and 66 together simultaneously. The valve rod 64 is mounted on a piston rod 69 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 can slide back and forth in a pipe section 71. Accordingly, the rod 66 is fastened to the catalyst valve to the piston rod 72 by a screw, and a lock nut 73 secures the parts to 2 ^r> in place. The piston rod 72 is slidable in a 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 piston rods 69 and 72. to cause the valve rod 64 and the valve rod 66 to the right (Fig. 6) to go to hold the synthetic resin valve 65 and the Kaialysatorventil 67 in the closed position when the trigger 62 is not according to the position corresponding to the extended r> Line F i g. 4 has moved away. Furthermore, if the trigger 62 is moved by the operator from a position in which he is to the left of the extended position shown in FIG. 4 is pivoted. is released, the force of the spring is transmitted via the piston rods 69 and 72 and the counter nuts 70 and 73 to the bow bar 68, which is held by the trigger, so that the trigger is in the extended position according to FIG. 4 pivoted 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. Unwinding can be done simply by 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. the 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 flush solvent through line 78 to the resin and catalyst mixing chamber 52 is controlled by a valve 79 attached to the end of a valve rod 80. At the other end of this one A head 81 is arranged on the rod and is in contact with the bracket 68 and, as shown in FIGS. 4 and 6 shown is. by pivoting the trigger 62 from the position according to the solid line in FIG. 4 on the position of the the broken line to the right of the solid line 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.

some cases

to be desirable

to apply chopped reinforcing fibers, such as fiberglass, with the synthetic resin. The fibers are said to be in the same direction as the stream of atomized plastic that is ejected from nozzle 47, so that the synthetic resin and the fibers meet with or before the fibers are deposited on the surface Mix. A device for shredding and blowing out the shredded fibers can be attached to the Spray gun 2 be attached, as in F i g. 9 is shown. To eject the chopped fibers, the Air brought to the gun body through conduit 84 (Figs. 1, 4, 6 and 9) from tubing 83 removed from 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 solid lines to the position shown by broken lines on the left triggered from the position shown by solid lines. By moving the trigger 62, 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. is the air from the line 84 behind the valve through a Opening 87 in the valve body to the pipe section 83 stream. When the pressure on the valve rod 86 is broken, a spring 88 becomes the valve 85 Return to its closed position to shut off the air supply to tube 83.

A representative fiber chopper is shown in FIG. 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 spun glass or other fibrous material 93 that is to be shredded, is pulled through between the chopper rollers and the support rollers and the fiber material is shredded so that the chopped fibers 94 fall off therefrom and by the rotating movement of the rollers 91 and 92 in one direction be thrown so that they are on the work surface or before the spray reaches the surface hit with the synthetic resin spray.

When the pistol trigger 62 is in the position of the solid line of FIG. 4 is there 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)

queue. The pressure in the flushing solvent supply line is also increased 78 and turn on 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 the broken line 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 Synthetic resin and the catalyst against the pressure of the check valves 50 and 5i and open them, to flow the resin and the catalyst to the mixing chamber 52. The synthetic resin and Catalyst mixture will flow from the mixing chamber through the winding path and from the spray nozzle 47 carried out. The supply of catalyzed resin will continue as long as the Trigger is pulled.

When a reinforcement fiber chopper 89 is attached to the spray gun, pulling the trigger is done 62 also cause a supply of air to the chopper in the manner described, so that the chopped fiber mixed with the synthetic resin spray. When the trigger is released, the fibers 75 become the Valves 65 and 67 close and the trigger 62 is moved to the position indicated by the solid line F i g. 4 return. Forward movement of the trigger will actuate spring 88 to close valve 85 in closed position, thereby cutting off the air supply to the reinforcement fiber chopper will.

If the application of the synthetic resin is to be interrupted for a noticeable time, the Trigger 62 simply to the right in Figure 4 into the position the broken line to the right of the position of the solid line is pivoted to the valve 79 of Its in SiU to lift so that the rinse solution through the resin and catalyst mixing chamber, the Resin and catalyst supply lines from the gun and the passages from the resin and catalyst mixing chamber 52 is pressed to the nozzle, so that everything provided with catalyst from the gun Resin dissolve and wash out. The trigger 62 is then released so that the spring 83 closes the valve 79 returns to the closed position and the supply of flush solvent is cut off. The gun is then simply ready to resume work by simply pulling the trigger again.

For this purpose 3 sheets of drawings

Claims (1)

Claim: Device for mixing liquid synthetic resin with a liquid catalyst and for Dispensing of the mixture, consisting of independent piston pumps for charging the mixing chamber under pressure with the synthetic resin and the catalyst, their piston roughly parallel direction are movable to each other, wherein the piston of the synthetic resin pump along a predetermined, fixed line is reciprocable, and by a lever with each other connected, its longer arm on the larger resin pump and the shorter one Arm is hinged to the smaller catalyst pump and one is in the longitudinal direction of the lever having extending slot in which a pivot pin to change the transmission ratio of the lever is displaceable and fixable, characterized in that the on his one end to the synthetic resin pump (6) articulated lever (26) at its other end a swivel joint (27) and with the catalyst pump arranged between the swivel joint and the synthetic resin pump (19) is connected, that at a distance below the lever a seated on the pump frame of the synthetic resin pump, Fixed arm directed transversely to the direction of movement of the piston of the synthetic resin pump (30) is arranged that a hinged strut (28) on the side facing away from the synthetic resin pump Catalyst pump at a distance and approximately parallel to the direction of movement of the reciprocating The piston of the pumps is arranged so that one end of the hinged strut is secured by a pivot pin (29) is connected to the fixed arm and the other end of the hinged strut is connected to the swivel joint and that the catalyst pump is pivotable with the fixed arm by a pivot pin (31) connected is.