DE1967063A1 - MIXING SYSTEM FOR A DEVICE FOR SPRAYING A MIXTURE OF LIQUID PLASTIC RESIN AND CATALYST - Google Patents

Description

- Trier, the ^.?. 1976

PATO.ITANWALT ■

WOlFGAMG SCHÖNHERR 1115

fJ 55 T :: f £ R - HAWSTRASSE 28

Frank E * Tves Kent, USA

Mixing system for a device for spraying a Mixture of liquid synthetic resin "and a catalyst

The invention relates to a mixing plant for a device for spraying "". a mixture of liquid Synthetic resin and a catalyst consisting of one Mixing chamber containing the liquid, from a synthetic resin pump synthetic resin supplied under pressure and the catalyst supplied under pressure from a catalyst pump .

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When spraying a mixture of liquid synthetic resin and catalyst, as is known, the proportion of the amount of catalyst is only a fraction of the amount of the resin. The ratio between synthetic resin and catalyst is in the order of magnitude of 100: 1 weight units. However, since the mixing ratio of the two components is strictly adhered to it is necessary that an intimate mixture takes place and the comparatively very slight one Amount of catalyst distributed evenly in the much larger amount of synthetic resin.

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

The object of the invention is therefore to provide a mixing plant of the type mentioned in such a way that the components flowing into the mixing chamber at the same time

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Entry into the mixing chamber and meet thereby an even distribution of the catalyst is given in the synthetic resin.

The object is achieved in that the catalyst supply channel is arranged in a hollow body, the The mixing chamber is located over a substantial distance protrudes.

The end section of the catalyst feed channel is preferably sufficient at least up to half the side of the mixing chamber mer in sighting parallel to the length of the canal in the Mixing chamber »" ■■ .-;

According to an advantageous development are in the end face the end portion of the hollow body fetus arranged, which go radially outwards to the inner channel and whose inner groove openings open into the channel.

According to a further development, the hollow body is designed as a visual bolt formed, the end portion is threadless.

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With the help of the training according to the invention it is achieved that the catalyst is added to the synthetic resin immediately after entering the mixing chamber and therefore a uniform one Distribution of the catalyst in the synthetic resin stream 'is given.

The invention is illustrated by way of example in the drawings. Show it:

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

2 shows the synthetic resin pump and the catalyst pump with a lever device connecting them in a side view,

3 shows a vertical section through the catalyst pump with air chamber,

Fig. If- a side view of the spray device, '

FIG. 3 is a front view of the spray device according to FIG. 3j

6 shows a cross section through the spray gun,

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Fig. 7 is an enlarged perspective view of individual parts animal spray ^gun:

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

9 is a perspective view of the discharge device

processing for shredded fibers. V-

It is common to use liquid synthetic resin, for example at Spraying paint, sprayed with a spray gun, using compressed air as a carrier for the synthetic resin. Such a technique is used, for example, when spraying Polyester synthetic resin applied. In some cases this will Synthetic resin mixed with reinforcing fibers. The Schwie-. the technical application of the synthetic resin is that the application of the resin is slow and therefore the applied resin tends to form air bubbles. It is also known to use a mixture of synthetic resin, such as polyester resin, and a catalyst that has the ability to make the synthetic resin to cure with such a spray gun

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splash. However, it is not possible to allow the resin to be sprayed for a long period of time interrupt without emptying and cleaning the spray device, otherwise the connected to the catalytic converter Resin would harden in the device.

The device according to the invention is for application a mixture of liquid synthetic resin such as polyester resin and a catalyst without using Air is suitable as a carrier medium. The mixture of synthetic resin and catalyst is shortly before its exit from the spray gun, so that if spraying is interrupted for a prolonged period, the Whole catalyzed resin can be flushed out of the device quickly and easily. Even the discharge is facilitated by the fact that the mixture of the synthetic resin and the catalyst just before the outlet takes place automatically from the pistol.

The device according to FIG. 1 consists of a synthetic resin container 1, a catalyst container 17, supply lines 16 and if-5 and a spray gun 2 with

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Mixing plant. The device is held by a support column 3 and a console 1+ . The support column is advantageously designed as a pneumatic or hydraulic piston cylinder arrangement which lifts the console if a pressure medium is supplied through a supply line 5. The starting position of the device can thus be changed by moving the console along the cylinder-piston column. _:

A synthetic resin pump 6 is sufficient with its lower end 7 into the 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, the medium under pressure, preferably air, through a supply line 10 is fed. The pump can be controlled automatically by the back pressure in a synthetic resin outlet line 11 so that the action of the pump starts when the Pressure in the outlet line below a predetermined value falls off, and the work of the pump becomes so; continued for a long time, until the pressure in the line has again reached the critical control value. ;

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The Kunstharziäiislaßl ei tung Rait a liquid flow-regulating needle valve ^{12.verbunden:} to maintain that is adjustable by a Srehknopf 13 to the working pressure of the resin at a value between 15 and / fO kg / cm (200 and 600 psi). The synthetic resin flows from this needle valve through a standard IZf filter. and one: Windkessel 15, Since the resin pump 6 is a piston pump, it will pump the resin from the container 1 into shafts. 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 guns 2 under a predetermined pressure.

To get the resin to be sprayed into the correct To bring state, -so that it is after the application hardens, it is necessary to coat the resin with a suitable catalyst to mix. A glass bottle or other container 17 contains the catalyst, The catalyst is removed from the container 17 via a line 18 from a pump 19, the structure of which is shown in detail in FIG. The catalyst is activated by going up and down a pump plunger 22

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with piston 23 from container 1? through the line 18 into a pump chamber £ 0 behind a check valve 21 pumped. When the piston 23 is moved downwards, will the check valve 21 by pressure of the piston, the on the catalyst liquid in the pump cylinder 20 affects, closed, so that the catalyzer behind the Check valve comes into a bore of piston 23, of which he passes through an opening 2if in the piston rod.

is omitted: '= ■ ■ ^; ; /; ; |

In order to ensure reliable curing of the synthetic resin, a predetermined minimum ratio of Catalyst to synthetic resin. In order to obtain a constant ratio of catalyst to synthetic resin, are the catalyst and resin pumps that are both inevitably move, connected to the simple piston motor 9 and driven by it. As the amount of catalyst in relation to the amount of synthetic resin,

is small, the catalyst pump 19 has one much smaller capacity than the pump β for the synthetic resin. The pumps are also connected to one another, so that the stroke length of the Kätälysätör pump 19 is at least -

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is adjustable in one direction to the ratio from catalyst to resin in the out of the device to be able to change the injected mixture.

The stroke of the piston rod 22 of the pump 19 can be at a given stroke of the resin pump 6 by using a pump structure as best shown in Figs can be seen to be changed. The upper end of the piston rod 22 is fixed in a block 25 which is between at a distance from the crossbars 26 of a lever which actuates the pump. The cross bars are attached via a pivot pin 27 to a lever arm 28, which is attached to a fixed arm 30 of the Pump frame is rotatably anchored. The lower end of the pump 19 is on this arm by a pivot pin 31 ■ attached. The block 25 is via a pivot pin 32, which extends through slots 26 in the cross bars 26, relative to the cross rods 26 = rotatably mounted. The length of these slots. Runs in the longitudinal direction of the Crossbars 26.

The ends of the cross bars 26 that are supported by the lever arm 28 are removed by a pivot 33 on the

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Piston rod 34 of: Pi ^ penantriebsmptors 9 attached., As shown in Fig. 2 is. Since the stroke of the rod 34 actuating the pump is constant and the bolt 27 of the cross rods 26 is essentially locking, the stroke of the piston rod 22 of the catalyst pump can pass through. Moving the pulp plug 32 in one or the other direction along the slots 26 'can be adjusted. This will cause the bolt to move to the right. (Fig. 2) the stroke length of the piston rod 22 of the resin pump for a given. Reduce the stroke length of the drive coupling rod 3h , while by sliding the bolt 32 to the left (Fig. 2) along the slots 26; ' the stroke length of the catalyst piston rod 22 increases. A handle 2 $ ^x is used to move / move the pivot pin 32 . on block 25, and the block slides in the first or other direction of the crossbars.

From the pump 19 the catalyst is in a line 35 » which is shown in Fig. 3, omitted, in which a reverse ' check valve 36 is arranged to a Sückfluss to Pump cylinder during the downward movement of the piston to prevent. The pipe 35 is connected to an outlet pipe 37 connected, -dip · ".-" has a narrow bore 38. TJm

To avoid undulating flow, an air chamber 39 is arranged on the outlet pipe. One valve is attached to the upper end of the air chamber, to which an air supply is connected to the air chamber to generate any desired air pressure.

In order to prevent the pressure of the catalytic converter in the bore 3S from rising higher than necessary due to the operation of the pump 19, a pressure relief valve pipe section 41 is arranged. The pipe section if-1 has a passage 1 + 2 in which a check valve 43 is located. The check valve is opened when the pressure becomes too high. The kata-. analyzer flowing through the check valve. returned to the container 17 through a line kk.

Since the amount of catalyst in relation to the amount of resin in the final mixture is very small, the flow from the catalyst outlet line 37 through the catalyst supply line k5 to the spray gun 2 is relatively small. In addition, the passage through the inflow line should be very small

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Wave movement of the catalyst flow to the spray gun to prevent what would cause; the pressure in the catalyst supply line 45 drops suddenly.

Since the spray gun is used to spray a synthetic resin and Catalyst mixture is to be suitable at a noticeable distance of, for example, 10 m from the synthetic resin container 1 and catalyst container 17, it is difficult to obtain a Hose of such length with a very small: cavity to be provided to feed the catalyst. Hose of such 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 be to clean the cavity of such a hose. Instead of a catalyst supply hose with a narrow Cavity is therefore provided a tube 45, the one has a relatively wide cavity and in which loose one flexible rod-like throttle piece 46 made of plastic is arranged. The catalyst must then come from outlet conduit 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.

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Dia, details of the synthetic resin spray gun are shown in FIGS . to 8 shown. The liquid synthetic resin spraying agent is discharged through a nozzle 1 + 7 , the mouth of which can be shaped so that a more or less conically widening or flat jet is created.

The synthetic resin feed line 16 brings the synthetic resin to a hole if8 in the nozzle head, and the Kat aly sat or feed line 1 + 5 brings the catalyst to a passage 1 + 9 i & nozzle head, as shown in FIG. A check valve 50 serves as a seal between the bore 1 + 8 and the synthetic resin supply line 16 in order to prevent the synthetic resin provided with catalyst from flowing back into the synthetic resin supply line. Accordingly, a check valve 51 is provided between the catalyst passage 1 + 9 and the catalyst supply line 1 + 5 in order to prevent the synthetic resin provided with catalyst from flowing into the catalyst supply line. The synthetic resin feed line l + Q and the catalyst feed line 1 + 9 both open into a synthetic resin and catalyst mixing chamber = 52.

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It is important that not just the resin and the The catalyst must be fed to the spray gun in a precise proportion, but it is also important to that the resin and the catalyst are seen to mix completely in a homogeneous mixture, allowing curing all parts of the synthetic resin can be done. The synthetic resin and catalyst mixture must therefore be the same Time to be splashed, so that the resin remains on the surface to which it is sprayed and the The tendency of the synthetic resin to collect in drops and run off on the surface, e.g. when the surface is inclined, "reduced to a minimum" The first step is to distribute the catalyst in the resin »The second step is to distribute the resin and mix the catalyst and the third Step is to spray this mixture.

To distribute the catalyst in the resin, f the synthetic resin supply line 48 and the catalyst supply ■ Contact line Jf9 in the gun body opposite aligned so that the synthetic resin and the catalytic converter meet in counterflow »Furthermore, the catalytic converter

feed line if9 drilled into a bolt 49 ', the. is screwed in such that the end of the catalyst feed line extends approximately into the middle of the mixing chamber 52. The bolt 49 'is advantageously made of a plastic material, for example nylon, which is insensitive to the catalyst and the synthetic resin. The end of the bolt has a number of radial grooves 49 ^f '' which, as shown in Fig. Δ, are cut in it, so that the catalyst flowing through the bore 49 in the bolt is deflected from the straight lines with the bore and flows along the grooves in separate parts of the mixing chamber 52.

The mixture of synthetic resin follows from the mixing chamber 52 and catalyst a meandering path to nozzle 47 for a complete mixture of the resin and catalyst to surrender. This path is through the interaction of a number of obstacles between the Mixing chamber and the nozzle were created. Advantageously, the obstacles are designed in such a way that an obstacle creates one peripheral passage and the adjacent obstacle results in a central passage for the resin mixture.

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The cooperating obstacles are shown in detail in FIG. One obstacle 53. » ^ as is provided for a peripheral synthetic resin mixing passage, has a solid wall 54, from the circumference of which fingers 55 extend axially. The fingers are spaced from one another; and allow a peripheral passage between them from one side to the other of the wall 5k *. The other obstacle 56 has a wall 57 which has a central passage 58 λ for the plastic mixture. The wall 57 of the obstacle 56 can be held ^{at a} distance from the wall 54 of the adjacent obstacle 53 by an annular flange 59. It is important that the radial thickness of the band 59 be substantially less than the radial depth of the grooves between the fingers 55 so as to permit peripheral flow from the recess in the sand 59 of the obstruction 56 through the grooves. While one of the obstacles 56 is shown in FIG. 6, which is arranged between two obstacles 53; a number of obstacles 53 and 56 can be used in an alternating arrangement. The obstacles 53 and 56; / are in an alternating arrangement, inserted in the bore near the nozzle 2f7. The nozzle 'is removable and at the end of the bore by a seal 60, which can be made of nylon

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can, ab ge dl, and provided with a screw cap 6i which has an opening to lengthen the nozzle. Spreading the resin through the nozzle. - .- is controlled by pulling a trigger 62 from a position: as indicated by the solid line in FIG. k to a position as shown by the broken line to the left of the solid line *. The trigger swivels around 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 Ght by a _; Resin control valve 65 to open, and a movement - a valve tan-, ge 66 to open a catalyst control valve 6? to open.

The simultaneous and coordinated reciprocation of the valve rods 6if and 66 is caused by pivoting a bracket 68 - which is carried by the trigger 62 to bring the Halt et parts for the two valve rods 6k and 66 into connection at the same time. The valve rod 6h 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 used for the back and forth movement relative zum.Pistolen- ι body, guided by the fact that it is in a piece of pipe 71 is slidable back and forth. The rod is accordingly of the catalytic converter valve on the piston rod 72 a screw connection is attached and a jam nut secures the parts in place. The piston rod 72 is slidable in a bore of a pipe section 7If, which in the gun body is screwed in. . .

Springs 75, which lie in recesses 76 in the gun body, bear against piston rods 69 and 72 to cause valve rod 6 * f and valve rod 66 to go to the right (FIG. 6), around synthetic resin valve 65 and to keep the catalyst valve 67 in the closed position when the trigger 62 is not pulled away from the position corresponding to the solid line by Fdg. i ±. Furthermore, if the trigger 62 is moved by the operator from a position in which he is to the left |

pivoted from the extended position of Fig. ^ is released, the force of the spring is over the Piston rods 69 and 72 and the lock nuts 70 and 73 onto the hanger bar 68 held by the trigger

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is transmitted, so that the trigger swings back into the extended position according to FIG. k , while the synthetic resin valve 65 and the catalyst valve 67 close at the same time.

When the injection of the synthetic resin provided with catalyst is interrupted for an extended time, while ⁼ of the one wherein the catalyst resin has a tendency to cure in the mixing chamber 52, mixing chamber 52, the resin supply passage IF8, the catalyst supply passage k9 and the passages of the mixing chamber can 52 to nozzle Zf? can be easily cleaned without disassembling the gun. This cleaning is accomplished by rinsing the mixing chamber and passageways with a synthetic resin solvent. Unwinding can be initiated simply by pushing the trigger 62 forward instead of pulling it backward. 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 reservoir and the connections to it are shown in FIG.

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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 "rod" a head 81 is arranged which is in contact with the shackle 68 and, as shown in FIGS. 4 and 6, by pivoting the trigger 62 from the position according to the solid line in FIG to position Λ

the broken line to the right of the solid line is pushed to the right. Opening the valve 79 allows the solvent in the mixing chamber 52 'to be flushed. from which it flows through the synthetic resin line 48 to the check valve 50 and through the catalyst line 49 to the check valve 51 as well as through the meandering passage formed by the obstacles 53 and 56 to and in the nozzle.

In some cases it may be desirable to "

chopped reinforcing fibers, like fiberglass, with the Apply synthetic resin. The fibers should be in the same direction as the flow of the atomized plastic that is ejected from the nozzle 47, so that the synthetic resin and the fibers

"j

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Do not store the fibers on the surface often. ¹ A device for comminuting and blowing out the shredded fibers can be attached to the spray gun 2, as shown in FIG. To the chopped "fibers herauszuschleudern, the air passing through line 84 may (FIG. 1, if, 6 and 9) to the l>istöl; is brought enkörper, von'einem Röhrstück 83 on fösto- ⁴ lehkörper removed.

The air discharge from the tubular piece 85 is controlled by a valve 85 which is opened by longitudinal movement of a valve rod 86. The movement is achieved by pivoting the trigger 62 from the position shown by the solid line in FIG. 1 to the position shown by the broken line 'to the left of the position shown by the solid line. Movement of the trigger 62 brings the yoke 68 into contact with the adjacent end of the valve stem 86 to place the valve 85 in the open position Air from the line 8 ^ behind the valve flow through an opening 87 in the valve body to the pipe section 83. When the pressure on

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the valve lug 86 becomes blocked, becomes a spring 88 the valve 85 back to its closed position Bring back the position i to the air supply to the pipe-'piece " 83 complete.

_t __ 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 supported against rotating rubber support rollers 92. The spun glass or other fiber material 93 "which 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 9 ^ f fall off it and are flung in one direction by the rotation of the rollers 91 and 92 so that they meet at the work surface or before the spray reaches the surface with the synthetic resin spray. f

If the Tistolenabzug 62 in the position of the solid -. M stands line of FIG, there are the resin supply valve 65, the resin passage check valve · 50, the catalyst supply control valve 67 '

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the catalyst passage check valve 51, the scavenging solvent supply valve 79 and the chopper air supply valve 85 are all in the closed position. Under these circumstances, both the resin supply line and the catalyst supply line Jf5 will have a pressure of about 15 to h-0 kg (200 to 600 psi). There will also be pressure in the flushing solvent supply line 78 and in the chopper air supply line 81+. The pressure in the

^ Resin supply line is used to keep the pump motor working 9 to interrupt.

When the synthetic resin is to be ejected, the trigger 62 is pulled by hand of an operator, who grips the handle of the pistol, into the left position shown by broken lines according to FIG. The operator can of course always operate the gun regardless of the direction of spraying. The trigger movement will open the resin valve 65 and the catalyst valve 67 simultaneously so that the pressure of the resin and catalyst press against the pressure of the check valves 50 and 51 and open them to allow the resin and catalyst to flow to the mixing chamber 32.

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The resin and catalyst mixture is taken from the mixing chamber flow through the meandering "path" and from the Spray nozzle 47 discharged. The delivery of with catalyst resin will last as long as the trigger is drawn 1st. .

If a reinforcement fiber chopper 89 is attached to the spray gun, pulling the trigger 62 in the manner described will also cause air to be supplied to the chopper so that the chopped fibers are mixed with the resin spray. When the trigger is released, the springs 75 will close the valves 65 and 67 and the trigger 62 will return to the position indicated by the solid line of FIG. Forward movement of the trigger will actuate spring 88 to move valve 85 closed, cutting off the air supply to the reinforcement fiber chopper * f

When the application of the resin for a noticeable Time is to be interrupted, the trigger 62 becomes easy to the right in Fig. 4 in the position of the interrupted Line to the right of the position of the solid line

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pivots, -to lift the valve 79 from its seat, so that the flush solvent through the resin and catalyst mixing chamber, the resin and catalyst supply lines the gun and the passages from the resin and catalyst mixing chamber 52 to the nozzle in order to dissolve and wash out all synthetic resin provided with catalyst from the gun. The deduction 62 is then released so that the spring 83 the Returns valve 79 closed and the supply of flush solvent is cut off. the Gun is then simply pulled again on the trigger for an immediate resumption of work ready.

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Claims (3)

Claims 1 · Mixing system for a device for spraying a mixture of liquid synthetic resin and a catalyst, consisting of a mixing chamber which receives the liquid synthetic resin supplied under pressure by a synthetic resin pump and the catalyst supplied under pressure by a catalyst pump, characterized in that the catalyst supply channel (49) is arranged in a hollow body (49 '), the end section (49a) of which protrudes over a substantial distance into the mixing chamber (52) . 2. Mixing plant according to claim 1, characterized in that the end section (49a) of the catalyst feed channel (49) at least up to half the width of the mixing chamber (52) direction parallel to the length of the inner channel (49) the mixing chamber is sufficient. 3. Mixing plant according to claims 1 or 2, characterized in that in the end face of the end portion (49a) of the hollow body (49 ') grooves (49 ¹ V) are arranged, which go radially from the inner channel (49) to the outside and their inner groove openings open into the channel. - 6098 49/0002 do - ". - Mixing plant according to one of claims 1 to j>, characterized characterized in that the hollow body is designed as a screw bolt, the end section (if9a) of which is threadless is. 609849/0002