DE4312994C2 - Device for spraying suspensions, in particular mortars - Google Patents

Description

The invention relates to a mortar syringe. Among them are Understand devices with which liquid or pasty media, in particular suspensions, such as different mortars Composition and delicacy, sometimes with very rough ones mineral proportions in an even distribution, continuous is to be sprayed onto surfaces, especially onto Wall surfaces in the construction industry. The surfaces achieved can depending on the setting of the device and the medium, rough or be smooth.

STATE OF THE ART

A mortar syringe is known from DE 23 38 752 A1 where the material flow of the material to be sprayed than running through a central tube that runs from a ringka nal is surrounded, in which compressed air is guided. This central tube ends at the entrance in a double cone Nozzle with an air baffle, through corresponding grooves training gives the airflow a twist. This gives  also the material flow a twist, which is good and the same moderate distribution of the material considered essential has been. The annular gap between the nozzle and the air guide head is through Axial adjustment of the nozzle adjustable.

With atomizing nozzles for liquids it is already known Provide guide channels with compressed gas feeds. In the CH 636 023 A5 proposes the liquid material flow to achieve good spraying results with a swirl provided and the outlet nozzle a pressurized gas ring feed channel to connect. In CH 663 730 A5, however, is suggested gene, immediately to a guide channel with compressed gas feeds bar to connect a nozzle element with an outlet nozzle. On Compressed gas ring feed channel is not provided. During derar constructions for spraying homogeneous, liquid Media may be suitable, it is questionable whether the Ver spraying multi-phase mortar satisfactory spraying results would be achievable.

A mortar syringe is also known from DE 83 29 892 U1 become in a material ending in a nozzle lead-through tube through a at a kink of this tube entering, leading into the middle of the material flow Compressed air supply pipe compressed air is blown in. Also at DE 35 11 291 C2, in which such an air supply pipe is performed, it is considered essential that compressed air and mortar flow meet at a small angle, to be able to mix uniformly and finely.

With known mortar sprayers, the problem occurred that certain material compositions, especially minera mortar, by applying mortar inside the The initially good effect takes effect during the work changed rapidly and cleaning was necessary. At  this leads to the processing of larger contiguous areas except for disturbing time delay to poorer quality of the total area because you have approaches at the beginning sees.

TASK AND SOLUTION

The object of the invention is to provide a mortar syringe which is a continuous, trouble-free spraying of Mortar of variable composition with even spray beam enables.

This object is solved by claim 1.

It has been found that this design, in the Compressed air in two axially consecutive levels Material flow can influence, on the one hand, a good and uniform spray jet with a wide variety of mortars ensures compositions and on the other hand a "growth sen "of the mortar or compressed air ducts, or in is to be feared to a much lesser extent. It is special been found that by the arrangement of the radial Penetrating holes penetrating the material guide channel, too can have a considerable diameter and accordingly accordingly more compressed gas in the upstream level Introduce material flow, the effect has been improved. It is surprising that, in contrast to earlier efforts exercises, the material flow through the compressed air supply none Swirl component needs to be issued and still one good and even atomization of the mortar occurs.

One advantage is that even with mortars that are very un have different ingredients, for example coarse some mineral components, such as pebble, the emerging conical spray jet has a uniform composition, while in the devices working with swirl by the occurring centrifugal separation after the different density or the ratio of density to the remaining forces, such as air resistance, was observed.  

The structure of the mortar sprayer can advantageously be such that the material guide channel as an exchangeable guide sleeve is formed. He can do different things knives depending on the mortar composition can be sized differently. For mortars with coarse proportions the pipe diameter should be 2 to 4 times, preferably 3 times the grain size of the coarse fraction. This can be about 12 to 18 mm. Due to the interchangeability is an adaptation to different types of mortar and also an easy replacement of one of the main wear parts, namely the material guide channel possible while the associated outlet nozzle is easily replaceable anyway is.

These guide sleeves have the pressurized gas feeds serving holes, usually four or provided more holes with their axes perpendicular to the longitudinal axis of the guide sleeve and symmetrical about the Pipe circumference are arranged. If there are two holes each coaxially opposite is cleaning with a tool particularly easy. The circumferential distance between adjacent holes can 3 to 8 times, preferably 4 to 6 times the Hole diameter. The hole diameter itself can in the range between 2 and 5 mm, preferably 2.5 up to 3.5 mm, the sum of the hole diameters being the usual guide sleeve sizes and an associated one Number of holes 0.5 to 1 times the inside diameter of the guide channel can correspond. The ratio between the cross-sectional area of the guide channel and the sum of the areas of the compressed gas guides can be between 2 and 15 (preferably 4 to 10) lie.

The entire mortar sprayer can be constructed very simply, for example from standard parts. With a tubular Ge Main part of the housing with a compressed air connection on the side ends, a connection for the mortar  Feed hose to be screwed on while at the front end the outlet nozzle directly or via a quick coupling for example, a bayonet coupling is coupled. there the material guide channel can be screwed through the rear connector with be fixed. Especially at Material guide channels of a relatively large diameter can it be beneficial on the inside of the case base some with longitudinal grooves and bars in the manner of cannelures watch the one hand with the webs the material guide channel and still one over the entire scope Ensure even pressure gas supply. It should at the compressed air inlet and in the area of the compressed gas supply an annular channel can be provided. Corresponding spacers could also be provided on the material guide channel although this is because of the formation of the material guide channel made of hardened material is more complex.

For setting the right spray jet is also the Angle on the inside of the outlet nozzle also the width of the ring gap forming there is important. This is an advantage adjustable, by a correspondingly wide opening screw the nozzle element.

By appropriate setting means, such as Markings and safeguards, for example with a Lock nut, can determine the most favorable situation sets and be held.

The outlet nozzle has a circular outlet cross cut open. The nozzle opening has one for reasons of wear certain length. This is followed, if necessary, with a generous one Fillet, a conical section that has a boundary of the annular gap. Its usually between 30 and 60 degrees angle (opposite the central axis) is from used materials depending. That from hard or tough existing material can also be used as an insert in the plastic outlet adapter can be used.

DRAWING SHORT DESCRIPTION

These and other features of the invention go beyond those of Claims also from the description and the drawings , the individual features each individually or more in the form of sub-combinations in one Embodiment of the invention and in other fields be realized and advantageous as well as protective can represent possible designs for which protection here is claimed. Embodiments of the invention are in shown in the drawing and are described in more detail below explained. Show it:

Fig. 1 shows a longitudinal section through a mortar syringe,

Fig. 2 is a longitudinal section through a variant of a mortar syringe,

Fig. 3 shows a cross section along the line III in Fig. 2 and

Fig. 4 shows a longitudinal section through a detail in the nozzle area.

DESCRIPTION OF THE EMBODIMENTS

In Fig. 1 an embodiment of the mortar syringe is shown in longitudinal section. The wall of the circular tube-shaped syringe housing 1 has a compressed gas inlet bore 2 approximately in the middle between the tube ends, into which the syringe-side end of an L-shaped bent gas supply tube 3 is inserted flush with the inner tube wall and z. B. is fixed by brazing. The end of the pressurized gas supply pipe 3 , which is not shown, is expanded in its outer diameter in two stages and in its inner diameter in one stage, an internal thread being provided in the expanded end region. The inner wall of the syringe housing 1 has in the region of the compressed gas inlet bore 2 an expansion of its inner diameter, whereby an annular groove 4 is formed, the width of which is slightly larger than the outer diameter of the compressed gas supply tube 3 , which ends entirely within the annular groove 4 . In the axial direction on both sides of the annular groove 4 , the inner wall of the syringe housing 1 has, for example, 12 adjacent, V-shaped longitudinal grooves 5 , the depth of which corresponds to the depth of the annular groove 4 . The longitudinal grooves 5 extend on the material outlet side to the end of the syringe housing 1 and on the material inlet side up to a step-like expansion of the inner diameter of the syringe housing 1 , which forms part of the guide sleeve receptacle 6 . The outside of the syringe body 1 has an inlet thread 7 on the material inlet side and an outlet thread 8 on the material outlet side, both threads extending from the respective housing tube end to the vicinity of the compressed gas supply tube 3 .

A material guide channel 9 is delimited by the inner wall of a material guide sleeve 10 , which preferably consists of at least partially hardened metal, the inner diameter of which initially tapers conically from the injection compound inlet opening 11 and then is constant up to the injection compound outlet opening 12 of the material guide sleeve 10 remains. The outlet-side end of the material guide sleeve 10 has at an axial distance approximately a guide sleeve diameter from the molding compound outlet opening 12 symmetrically distributed around the guide sleeve circumference on two pairs of coaxially opposed compressed gas supply lines 13 , the hole axes of which are substantially perpendicular to the longitudinal axis of the guide channel. On the outside, the material guide sleeve 10 in the area of the injection compound inlet opening 11 has gradations which are adapted to the inner contour of the syringe housing 1 in the area of the guide sleeve receptacle 6 . The molding compound inlet opening 11 is limited by a formed on the material guide sleeve 10 end flange 14 , the outer diameter of which is larger than the inner diameter and smaller than the outer diameter of the syringe housing 1 . In the installed state, the step-side outer contour of the material guide sleeve 10 in the area of the guide sleeve receptacle 6 is in a form-fitting manner against the step-like inner contour of the syringe housing 1 , the end flange 14 of the material guide sleeve 10 partially overlapping the end face of the syringe housing wall and the material guide sleeve 10 is arranged substantially coaxially in the syringe housing 1 .

The material guide sleeve 10 is fixed in its installed position by a material feed coupling 15 screwed onto the entry thread 7 of the syringe housing 1 , which can be a commercially available bayonet quick coupling. A projection formed on the material supply clutch 15 inlet collar 16 lies with its side facing the syringe housing shoulder on a sleeve seal 17, which enters the space between a collar 16 and fills the inlet end side of the material guide sleeve 10 degrees. On the housing 1 facing away from the syringe housing 1 of the entry collar 16 a preferably made of elastic-compressible material ring-shaped feed seal 18 is provided, which partially overlaps the supply side end face of the material feed coupling 15 in its full extent.

On the outlet thread 8 of the syringe housing 1 is designed as a bayonet coupling outlet coupling 19 is screwed, on which an inwardly directed outlet collar 20 is formed, which overlaps the outlet-side end face of the wall of the syringe housing 1 in its full extent. The facing by the syringe housing 1 shoulder of the outlet collar 20 and the outlet end of the syringe barrel 1 slightly tapered wall of the syringe barrel 1-limited intermediate space is filled through an outlet coupling seal 21st On the shoulder of the outlet collar 20 facing away from the syringe housing, an annular outlet seal 22 is provided which partially overlaps the full extent of the outlet-side end face of the outlet coupling 19 . The facing away from the syringe housing 1 end face of the Austrittsmit telkupplung 19 at two opposing locations projecting grip clips of the outlet coupling 19 embrace outward retaining collars of a nozzle holder 23 , between its inwardly directed retaining collar 24 and the outlet seal 22 a nozzle holder seal 25 is arranged, the same Has inner diameter as the holder collar 24 and the outlet seal 22 . In an outlet-side internal thread of the nozzle holder 23 , a nozzle element 26 is screwed with its inlet-side external thread, an annular groove-shaped space remaining between the inlet-side end face of the nozzle element wall and the retaining collar 24 of the nozzle holder 23 , which is preferably elastic by an O-ring-shaped nozzle seal 27 -Compressible material is filled out. The Innenkon structure of the nozzle member 26 is tapered to trittsdüse From 28 out wherein the inner diameter of the outlet nozzle 28 in the end region of the nozzle is substantially constant.

The adjoining inner contours of syringe housing 1 , outlet collar 20 , outlet seal 22 , nozzle holder seal 25 , retaining collar 24 , nozzle seal 27 and the access-side inner wall of the nozzle element 26 form the outer limitation of a compressed gas annular channel 29 , the inner boundary of which is defined by the outside of the material guide sleeve 10 is formed, and the access side by the in the area of the guide sleeve receptacle 6 form-fitting compression of the syringe housing 1 and material guide sleeve 10 is limited. The pressurized gas annular channel 29 is expanded in the inlet area of the pressurized gas supply tube 3 through the annular groove 4 in its outer diameter and structured by the axially extending longitudinal grooves 5 in the axial direction up to the outlet end of the syringe body 1 .

In the area between the pressure gas lines 13 and the spray mass outlet opening 12 and the material guide sleeve 10, the outer diameter of the material guide sleeve 10 reduces conical, which leads to a broadening of the compressed gas-annular channel 29 in this area. At the axial level of the molding compound outlet opening 12 , the compressed gas ring channel 29 is delimited by an annularly shaped compressed gas ring supply channel 30 , in the area of which the material guide channel 9 and the compressed gas ring channel 29 open into one another.

The embodiment of the mortar sprayer shown in FIG. 2 differs from the embodiment according to FIG. 1 with otherwise the same structure only by the dimensions and the design of the material guide sleeve 10 and by the design of the outlet means, ie the area which is related to the Outlet opening 12 of the material guide channel 9 connects. The material guide sleeve 10 has a larger inner diameter than that shown in FIG. 1, which leads to a larger cross-sectional area of the material guide channel 9 . The number of symmetrically distributed about the sleeve circumference compressed gas inlets 13, the material guide sleeve matched to the enlarged inner circumference 10 increased by two, wherein the hole axes of each another in pairs coaxially opposite pressure gas inlets 13 of the material guide channel perpendicular to the longitudinal axis. 9

As shown in FIG. 3, the material guide sleeve 10 sits with its outer circumference with a precise fit on the apexes of the V-shaped longitudinal webs 31 formed between the longitudinal grooves 5 . As shown in FIG. 2, the pressurized gas annular channel 29 runs within the syringe housing 1 only in the area of the annular groove 4 completely around the entire circumference of the material guide tube 10 , and is formed in the area of the longitudinal grooves 5 in the form of axially aligned pressurized gas channels which are connected to border the annular groove 4 on one side, are closed on the material inlet side of the syringe body 1 in the region of the guide sleeve receptacle 6 by the form-fitting compression of the syringe housing 1 and the material guide sleeve 10 there, and end on the material outlet side of the syringe housing 1 in an annular channel-shaped space that passes through the outside of the material Guide sleeve 10 is limited on one side. The outer boundary of this annular channel-shaped space is formed by a pressure gas guide element 32 , preferably made of plastic, which reduces the cross section of the pressure gas ring channel in the area following the step in the direction of pressure gas flow by a step-like reduction in inner diameter.

The compressed gas guiding element 32 is arranged in the internal thread of a nozzle attachment 33 designed in the form of a threaded union nut, which is screwed onto the outlet thread 8 of the syringe housing 1 . The inner contour of the nozzle set 33 then tapers to the internal thread towards the nozzle exit plane and is rounded towards this plane. The axial position of the nozzle attachment 33 is defined by a locking element 34 , which is tensioned directly against the inlet-side end face of the nut wall and is designed as a lock nut, and which is also seated on the outlet thread 8 . The axial position of the nozzle attachment 33 also defines the cross section of the compressed gas ring feed channel 30 .

FIG. 4 shows another embodiment of a molding compound outlet attachment, the outer dimensions of which correspond to the embodiment shown in FIG. 3. In the embodiment according to FIG. 4, a nozzle insert 35, preferably made of hard or hardened material, is comprised of a threaded element 36 , preferably made of plastic, which is fixed by the locking element 34 in its axial position on the outlet thread 8 of the syringe body 1 .

FUNCTION

The mortar syringe works as follows: First, a suitable material guide sleeve 10 is selected according to the consistency of the material to be sprayed. It has been shown that both liquid media such. B. dispersion colors, as well as pasty mortar up to a coarse portion with a diameter of approx. 8 mm can be sprayed equally and continuously with the mortar syringe. When selecting the guide sleeve, it should be noted here that the inside diameter of the guide sleeve should be more than 2 times, preferably about 3 times the diameter of the coarsest parts of the molding compound, in order to avoid blockages due to coarse parts wedged together. Since the flow rate of material depends on the cross-section of the material guide channel, sleeves with an inner diameter that is too large should not be selected to allow a uniform spraying effect on the selected material. The optimal adaptability of the syringe to the spray material is a great advantage when using interchangeable guide sleeves.

On the outlet thread 8 of the material outlet side of the syringe body 1 , in the embodiment shown in FIG. 1, an outlet means coupling 19 is screwed on, with the aid of which the nozzle holder comprising the nozzle element 26 is flanged sealed against the syringe housing. The selected material guide sleeve is inserted into the syringe body 1 and sealed with the sleeve seal 17 by screwing on the material feed coupling 15 in the syringe housing 1 . By designing the material supply coupling 15 as a bayonet or quick coupling, a material supply hose can then be attached to the mortar sprayer quickly and easily. If the compressed gas hose is also attached to the compressed gas supply pipe, the syringe, which can be very securely gripped and guided due to the shape of the syringe body and the compressed gas supply, is ready for use.

After switching on a compressed gas compressor and a mortar pump, mortar is pressed through the material guide channel 9 . The pressurized gas, in particular the pressurized air, flows through the pressurized gas supply pipe into the syringe housing, the space partially delimited by the annular groove 4 being evenly filled with pressurized air. In particular in the embodiment of the material guide sleeve shown in FIGS . 2 to 4, which fills the syringe housing up to the webs 31 between the longitudinal grooves 5 , the annular groove 4 serves to compare and promote the air pressure conditions around the entire circumference of the material guide sleeve thus the generation of a uniform spray pattern. The compressed air then passes through the compressed gas ring channel 29 , which in the case of the largest material guide sleeve is axially structured through the longitudinal grooves 5 , into the area of the compressed gas supply lines 13 in the material guide sleeve 10 . A portion of the compressed air passes through these compressed gas feeds and in contact with the mortar flow, the radial orientation of the compressed gas feed guides 13 allowing the compressed air to act essentially perpendicularly on the mortar flow. It is assumed that at least a part of this compressed air penetrates into the mortar flow and the mortar passes through it evenly with compressed air and thus loosens it evenly. In contrast to tan gential compressed air supplies, which seek to form a more laminar flowing compressed air jacket around the mortar flow around, a turbulent flowing mortar / air mixed flow is generated in the invention. A uniform penetration of the mortar with compressed air is also sought through a suitable, not too large circumferential distance between adjacent compressed air feeds, which can preferably be 4 to 6 times the hole diameter, which itself can preferably be between 2.5 and 3.5 mm . The optimal ratio of the cross-sectional area of the material guide channel to the total area of the compressed gas supply holes can be between 4 and 10.

Setting mortar could "bake" on sleeve parts, which at diagonally arranged pressurized gas feeds of earlier mortar spri often contribute to the "overgrowth" of the holes and thus to radio interference the syringe. With the radial arrangement of the Compressed gas supplies do not experience this "growth problem" so that continuous spraying without breaks to the Reini supply of compressed gas supply is made possible. Little one Function of the syringe not impairing caking in the compressed gas feeds can also after the end of Spraying process easily and quickly e.g. B. by pushing through a mandrel or screwdriver through which each coaxially opposite compressed gas feeds removed become.

In Druckgasflußrichtung behind the pressure gas supply in the region of the spray mass discharge opening 12 guide sleeve material 10 and the inner wall of Düsenele mentes is a pressurized gas-Ringzuführkanal formed between the 26 29. The cross section of this channel generally depends on the axial position of the nozzle element and on the design of the inner sides of the components lying in the material flow direction in front of the outlet nozzle 28 and influences, just like the cone angle of the inside of the nozzle element and the inner diameter of the outlet nozzle 28, the expansion of the spray jet. This ability to influence the spray jet is another great advantage of the new mortar spray. The approximate shape in the exporting of FIG. 2 attached to the syringe housing 1 screwed nozzle member 33 which is adapted, with its inner dimensions for the combination with a material guide tube with the greatest outer diameter, is formed as a threaded nut. Screwing this nut onto the syringe housing reduces the cross section of the compressed gas ring feed channel 30 and thus changes the ratio of the compressed air quantities which act on the mortar flow at the axial level of the compressed gas feed lines 13 or at the level of the compressed gas ring feed channel 30 . A given composition for a mortar composition as the optimally found axial position of the nozzle element 33 can be determined with the help of the lock nut 34 , and this setting can be reproduced at any time with the aid of markings which indicate the axial position of the lock nut and / or the attachment even if the syringe has now been used for many other materials.

As shown in FIG. 4, the threaded element of an injection molding outlet attachment can also consist of plastic, in which only the nozzle element 35 consists of hard or hardened material. This embodiment also makes the already very compact and easy-to-use mortar syringe particularly light, which can be particularly advantageous in the long run for the continuous work possible with the syringe in the sense of a reduced effort when holding and guiding by the user.

With nozzle elements of different nozzle diameters from z. B. 1 up to 16 mm, exchangeable guide sleeves of various Inner diameter of z. B. 8 to 18 mm and various Formations of the nozzle cone in the area of the outlet nozzle with the new mortar syringe an easy and easy to use Device created that is easy for use with various spray materials can be optimized, can be operated continuously and reproducibly can produce uniform spray jets.

Claims (23)

1. Mortar syringe with

• - a syringe housing ( 1 ),
• - A material supply connection ( 15 ) for the supply of material to be sprayed
• - a material guide channel ( 9 ) guiding a material flow,
• - whose outlet opening ( 12 ) is surrounded by a pressurized gas ring feed channel ( 30 ) to which an outlet nozzle ( 28 ) of a nozzle element ( 26 ; 33 ; 35 , 36 ) connects in the direction of flow,
• - Pressurized gas feeds ( 13 ) are provided in the wall of the guide channel ( 9 ) at a distance from the compressed gas ring feed channel ( 30 ),
• - Which are arranged in a plane containing the longitudinal axis of the guide channel through the material guide channel ( 9 ) and
• - Which are arranged radially to the material guide channel ( 9 ).

2. Mortar syringe according to claim 1, characterized in that the material guide channel ( 9 ) is designed as an exchangeable guide sleeve ( 10 ). 3. Mortar syringe according to claim 2, characterized in that the interchangeable material guide channels ( 9 ) consist of hard material, preferably hard or hardened metal and from the mass inflow side, which is smaller and subsequently constant along the longitudinal axis of the channel of approximately 12 or approximately 18 mm exhibit. 4. Mortar syringe according to one of the preceding claims, characterized in that the material guide channel ( 9 ) at an axial distance of approximately one channel internal diameter from the spray compound outlet opening ( 12 ) at least four with their axes perpendicular to the channel longitudinal axis of the compressed gas supply ( 13 ), which are arranged symmetrically around the channel circumference. 5. Mortar syringe according to one of the preceding claims, characterized in that there are two compressed gas feeds ( 13 ) coaxially opposite each other. 6. Mortar syringe according to one of the preceding claims, characterized in that the circumferential distance between adjacent perforated axes of the compressed gas feeds ( 13 ) is 3 to 8 times, preferably 4 to 6 times the hole diameter. 7. Mortar syringe according to one of the preceding claims, characterized in that the number of holes the Inner diameter of the channels is adjusted so that the Sum of the hole diameters 0.5 to 1 times the Corresponds to the inside diameter of the channel.   8. Mortar syringe according to one of the preceding claims, characterized in that the ratio of the cross-sectional area of the material guide channel ( 9 ) to the total area of the holes is between 2 and 15, preferably between 4 and 10. 9. mortar syringe according to one of the preceding claims, characterized in that the hole diameter is 2 to 5 mm, preferably 2.5 to 3.5 mm. 10. Mortar syringe according to one of the preceding claims, characterized in that the syringe housing ( 1 ) on its outside on the mass supply side an entry thread ( 7 ) for receiving a material feed coupling ( 15 ) and on the material exit side an exit thread ( 8 ) for Inclusion of a spray compound outlet attachment holding the nozzle element ( 26 ) and an L-shaped bent gas pipe ( 3 ) for the pressurized gas supply reaching into the interior of the syringe housing. 11. Mortar syringe according to one of the preceding claims, characterized in that the pressurized gas ring feed channel ( 30 ) and the pressurized gas feeds ( 13 ) are connected to a common pressurized gas ring channel ( 29 ) which surrounds the material guide channel ( 9 ). 12. Mortar syringe according to claim 11, characterized in that the pressurized gas annular channel ( 29 ) has longitudinal webs ( 31 ) and longitudinal grooves ( 5 ) which are formed on the inner wall of the syringe housing ( 1 ). 13. Mortar syringe according to one of the preceding claims, characterized in that the inside of the round tube-shaped syringe housing ( 1 ) in the region of the pressure gas inlet has an expansion of the inner diameter in the form of an annular groove ( 4 ). 14. Mortar syringe according to one of the preceding claims, characterized in that the compressed gas ring feed channel ( 30 ) as an annular gap between the outside of the mouth area of the material guide channel ( 9 ) and the tapered inner contour of the nozzle element ( 26 ; 33 ; 35 , 36 ) is trained. 15. Mortar syringe according to one of the preceding claims, characterized in that the nozzle element ( 33 ; 35 , 36 ) in its axial position by means of a locking element ( 34 ), preferably a lock nut, is fixedly adjustable. 16. Mortar syringe according to claim 15, characterized in that the syringe housing ( 1 ), the nozzle element ( 33 ; 35 , 36 ) and / or the locking element ( 34 ) have markings for fixing the axial position of the nozzle element ( 33 ; 35 , 36 ) . 17. Mortar syringe according to one of the preceding claims, characterized in that the axial distance between the mouth of the material guide channel ( 9 ) and the outlet nozzle ( 28 ) is adjustable. 18. Mortar syringe according to one of the preceding claims, characterized in that the region of the outlet nozzle ( 28 ) consists of hard or hardened material, preferably of hardened metal. 19. Mortar syringe according to one of the preceding claims, characterized in that the nozzle element ( 33 ) is formed out of one piece in the form of a threaded union nut. 20. Mortar syringe according to one of claims 1 to 18, characterized in that the nozzle element ( 35 ; 36 ) is designed as a plastic threaded element ( 36 ) with a nozzle insert ( 35 ) made of hard or hardened material, preferably hardened metal. 21. Mortar syringe according to one of the preceding claims, characterized in that the inner contour of the nozzle elements ( 33 ; 35 , 36 ) in the region of the outlet nozzle ( 28 ) tapers conically to the nozzle outlet plane and is rounded off towards this plane. 22. Mortar syringe according to one of claims 10 to 18, characterized in that the molding compound outlet attachment the nozzle element ( 26 ), a nozzle holder ( 23 ) comprising this with a bayonet connection and a fixed and adjustable outlet coupling ( 19 ) on the syringe housing ( 1 ) having. 23. Mortar syringe according to one of claims 1 to 20 or 22, characterized in that the inner contour of the nozzle element ( 26 ) only converges conically to the nozzle outlet plane and has an approximately constant diameter in its end region.