EP2100788B1 - Sanding system for railway vehicles - Google Patents

Description

The invention relates to a sand discharge device according to the preamble of claim 1.

Such Sandaustragseinrichtungen for rail vehicles, especially for trams, have long been known. As a rule, such a sand discharge device consists of a sand container which is filled with sand. Depending on the design variant, the sand is then transported in different ways by sand conveyor lines in front of the wheels of the rail vehicle, where he should increase the friction between rail and wheel and thus prevent slippage of the wheels when starting or braking.

In a widespread variant, the lower portion of the sand tank is funnel-shaped. By means of a arranged at the bottom of the funnel-shaped suction nozzle device, which is usually operated with compressed air, the sand is sucked out of the sand container and transported by sand conveyor lines in front of the wheels of the rail vehicle.

The GB 28,725 from the year 1913 shows such a device in which the suction nozzle device comprises two superimposed, conical caps, between which there is an injection space which is connected by an annular gap with the sand container. The upper cap has a larger diameter than the lower cap and shields the injection space against the surrounding sand. The upper cap supplies a fluid, eg compressed air or steam, at high speed in the vertical direction, whereby a negative pressure is created in the injection space, which sucks the sand through the annular gap from the sand container into the injection space. There, the sand is entrained by the incoming fluid and fed through an opening in the lower cap of a sand conveyor line. In this device, it may happen due to operational vibration that sand enters the injection chamber and subsequently into the sand conveyor line. In the worst case, this can lead to clogging of the sand conveyor, but in any case it comes to an undesirable application of sand and emptying of the sand container while driving.

The GB 663,674 shows a similar device in which compressed air is fed to a pressure chamber and from there vertically down to an injection space, which opens into a kind Venturi nozzle, which is connected to a sand conveyor line. The upper edge of the Venturi nozzle has a bead opposite the surrounding bottom of the sand container which is to prevent sand from entering the nozzle and further into the sand conveying line when the pressure chamber is not pressurized with compressed air. In such a device, it can still easily come with shocks and bumps while driving that unwanted sand slips into the nozzle, further, the amount of sand discharged can be difficult to dose.

In the devices from the GB 28,725 and the GB 663,674 Furthermore, moisture from the surroundings of the sanding device can enter the sand container through the sand conveying line and lead to agglomeration, possibly at low temperatures, to the freezing of the sand in the area of the suction nozzle arrangements.

The EP 1 470 981 describes a cylindrical suction nozzle assembly with a conical cap which is located at the bottom of a tapered sand tank. The suction nozzle assembly can be acted upon with compressed air, which flows through the interior of the arrangement in the vertical direction. Between the interior of the arrangement and the surrounding sand container horizontally extending suction channels are arranged. Upon application of the arrangement with compressed air, a negative pressure is created in the interior, which draws sand from the environment through the suction channels into the interior. This sand is then entrained in the interior of the compressed air jet (ejection) and fed to the underside of the Saugdüsenordnung the attached sand conveyor line. In the interior of the assembly, a housing is fitted with holes, wherein the holes are aligned with the openings of the suction channels. By rotation of this housing, the cross section of the suction channels can be changed, whereby the sucked amount of sand can be regulated. To prevent sand from entering the suction channels, the conical cap extends past the openings of the suction channels, creating an annular gap through which sand can only enter when sucked by the negative pressure inside the assembly.

However, if the sand meshed by shaking or packed by moisture, it is with the in the EP 1 470 981 proposed solution to ensure a balanced sand application. In addition, the sand output can vary greatly depending on the filling level of the sand in the sand container. Furthermore, the construction by means of a housing which is rotatably mounted in the suction nozzle assembly, consuming and expensive.

It is therefore an object of the invention to provide a sand discharge device which allows a constant sand discharge regardless of the filling height of a sand container, further shakeproof and leak-proof and has a compact design as possible.

This object is achieved with a Sandaustragungseinrichtung of the aforementioned type according to the invention that the suction channel is inclined at an acute angle to the central axis of the housing down and further the housing has at least one ventilation duct with an inlet opening and an outlet opening, wherein the outlet opening within the Sandaustragungseinrichtung opens into the reservoir.

The inventive device allows by combining the Ejektionsprinzips with its own ventilation constant sand delivery at different filling heights of the reservoir. Ventilation by means of the ventilation channel loosens up the sand that is sucked in through the suction channel - so that solidification resulting from vibrations and moisture can be released. The outlet opening can basically be arranged above, but also below or at the same height with the outer opening of the suction channel. For the assignment of the terms above, above, below and below, a suction nozzle insert is to be assumed here and subsequently, which is arranged so that its central axis is oriented in the vertical direction. In order to allocate the above information correctly in other cases, this general case should always be used. Due to the inclined arrangement of the suction channel, the device is leakproof in a state without pressurized air. As used herein, the term 'inclined arrangement' strictly refers to the location of a line of communication between the outer and inner openings of the suction channel, the term "downwardly inclined" being seen in the direction from the inner to the outer opening of the suction channel the outer opening of the suction channel is in vertical alignment of the sand discharge under the inner opening of the suction channel - portions which have a slightly different orientation, in the light of this clarification can be seen. Due to its simple and compact design, the device is inexpensive and can further be used both in pressure-resistant and in ventilated, so open storage containers. Retrofitting in existing systems is relatively easy.

Conveniently, the outlet opening of the ventilation channel opens above the outer opening of the suction channel in the reservoir. In this arrangement, it is advantageous that the sand above the suction channel ventilated and loosened, thereby facilitating the suction of the sand.

Advantageously, the inlet opening of the ventilation channel with the ambient atmosphere of a rail vehicle, on which the sand discharge device is installed or in which the Sandaustragungseinrichtung can be installed, or a passenger compartment of such a rail vehicle in conjunction. As a result, air can be supplied to the storage container via the ventilation system in a simple and uncomplicated way. In the event that the inlet opening opens into the passenger compartment, the air supplied through the ventilation is normally warmer than the ambient air, which can help prevent condensation of the water vapor or freezing of the sand, especially in the cold season.

It is further advantageous if the ventilation duct is arranged substantially parallel to the central axis of the housing of the Saugdüseneinsatzes in the housing, whereas the part of the ventilation duct is inclined immediately in front of the outlet opening at an acute angle to the central axis of the housing downwards. This prevents leakage of the sand through the ventilation duct. In addition, in the case of an arrangement of the outlet opening above the outer opening of the suction channel so particularly the sand is vented over the suction channel, which facilitates the suction significantly.

The housing of the Saugdüseneinsatzes has at its upper end a substantially conical portion which has a larger diameter than the cylindrical portion of the housing in the transition region to the cylindrical portion of the housing and forms an annular cover which projects beyond the cylindrical surface of the housing. The distance x, by which the annular cover protrudes beyond the cylindrical surface of the housing, is advantageously at most 25 percent of the radius of the cylindrical part of the housing. Such a dimension offers a favorable compromise between stability and the greatest possible shielding. The cone-shaped section absorbs the load of the sand arranged above the suction nozzle insert and, through its cover, ensures that the sand underneath is subjected to lower pressure and can therefore be better sucked through the suction channel. Furthermore, the sand can easily slip through the cone shape.

In an advantageous variant of the invention, the suction nozzle insert is arranged in the reservoir so that the central axis of the housing is oriented substantially vertically; in another variant, the suction nozzle insert is arranged so that the central axis of the housing is inclined by an angle α to the vertical, wherein for the angle α is: 0 ° <α ≤ 30 °. In the second case, however, it should be ensured by rotating the suction nozzle insert about its central axis that the suction channels have the correct inclination and no sand unintentionally enters through them. Depending on the arrangement of the suction nozzle insert, the sand application can be varied and thus optimized for different applications. Furthermore, due to the inclined attachment in practice often results in a cheaper to be laid sand conveyor line with better drain slopes and more moderate arcs. This leads to improved operational safety due to favorable flow conditions of the brake sand-air mixture.

High humidity within the reservoir often causes difficulties in sanding systems, as it tends to clump together and even freeze at low temperatures. This problem is remedied according to the invention by a container with a dehumidifying agent is detachably disposed within the reservoir. Such a dehumidifying agent may be silica gel or similar materials. The detachable arrangement can be made by any known in the art in a variety of closures. Good results can be achieved by using a magnetic closure. This allows the container to be easily replaced. It is also possible to remove the container, cook it out and put it back in again. Thus, the same container can be used very often, which saves costs.

In a variant of the invention, the reservoir has a closable by means of lid Sandeinfüllstutzen for receiving sand, wherein the container with the dehumidifying agent on an inner side of the lid is detachably arranged. In this way, it is particularly easy and uncomplicated to handle the container.

Conveniently, the container has the form of a perforated cage. However, a number of other embodiments are possible.

• Fig. 1 ein Funktionsschema der erfindungsgemäßen Sandaustragungseinrichtung,
• Fig. 1a einen Ausschnitt der in Fig. 1 dargestellten Einrichtung mit gegen die Vertikalrichtung geneigten Saugdüseneinsätzen,
• Fig. 2 eine Schnittansicht parallel zu einer Mittellinie eines Saugdüseneinsatzes entlang der Linie B-B in Fig. 3,
• Fig. 3 eine Draufsicht eines Saugdüseneinsatzes gemäß einem Schnitt entlang der Linie A-A in Fig. 2 (und Fig. 4),
• Fig. 4 eine Schnittansicht wie in Fig. 2 entlang der Linie C-C in Fig. 3,
• Fig. 5 eine Schnittansicht wie in Fig. 2 entlang der Linie D-D in Fig. 3,
• Fig. 6 eine Schnittansicht eines Sandeinfüllstutzens mit geschlossenem Deckel und
• Fig. 7 eine Schnittansicht eines Sandeinfüllstutzens mit geöffnetem Deckel.

In the following the invention will be explained in more detail with reference to a non-limiting embodiment, which is illustrated in the drawing. In this shows schematically:

• Fig. 1 a functional diagram of the Sandaustragungseinrichtung invention,
• Fig. 1a a section of in Fig. 1 illustrated device with inclined against the vertical direction suction nozzle inserts,
• Fig. 2 a sectional view parallel to a center line of a Saugdüseneinsatzes along the line BB in Fig. 3 .
• Fig. 3 a top view of a Saugdüseneinsatzes according to a section along the line AA in Fig. 2 (and Fig. 4 )
• Fig. 4 a sectional view as in Fig. 2 along the line CC in Fig. 3 .
• Fig. 5 a sectional view as in Fig. 2 along the line DD in Fig. 3 .
• Fig. 6 a sectional view of a Sandeinfüllstutzens with closed lid and
• Fig. 7 a sectional view of a Sandeinfüllstutzens with the lid open.

Fig. 1 shows a functional diagram of the invention Sandaustragungseinrichtung 1. Here, a reservoir 2 is arranged for brake sand on the rail vehicle, which can be filled via a Sandeinfüllstutzen 4 with sand. The Sandeinfüllstutzen 4 is closed with a lid 3 to protect the brake sand against moisture and foreign bodies. In the storage container 2, a viewing window 20 may be arranged, with the level of the reservoir 2 can be easily checked with the uncomplicated. Reservoir 2 can basically be designed to be ventilated or pressure-resistant; the sand discharge device 1 according to the invention can be used for both variants.

As in Fig. 1 can be seen, the reservoir 2 has a conically converging bottom region. At the lowest point of the bottom area, at least one suction nozzle insert 5, 5 'is arranged for sand. In principle, the suction nozzle insert 5 can be arranged at any point in the storage container 2, but the best results can be achieved when arranged in the bottom area. The suction nozzle insert 5, 5 'opens into a sand conveying line 8, 8', which transports the braking sand via a sanding bell 21, 21 'in front of the wheels of the rail vehicle. This sand bell 21, 21 'optionally has a heating cartridge; Thus, at low temperatures freezing and resulting clumping of the sand in the sand conveyor 8, 8 'and the sand bell 21, 21' can be prevented. Furthermore, the sand bell 21, 21 'also have special channels and vents that prevent or reduce high-rising moisture and water spray.

If the rail vehicle is operated bidirectionally, two suction nozzle inserts 5, 5 'are advantageously provided with associated sand conveying lines 8, 8' and sand bells 21, 21 '. This second set of sanding devices is in Fig. 1 shown in dashed lines. For the other figures is only on the in Fig. 1 turned off institutions shown turned off.

The further figures show detailed illustrations of the suction nozzle insert 5, which can be fixed by means of screws or other types of fastening in the bottom region of the storage container 2. Both FIGS. 2 . 4 and 5 these are sectional views parallel to the central axis 16 of the suction nozzle insert 5, Fig. 3 shows a plan view of the suction nozzle insert 5 with the course of the sections shown in the other figures.

at Fig. 2 it is a section parallel to the longitudinal axis of a Saugdüseneinsatzes 5 along the section line BB in Fig. 3 , The suction nozzle insert 5 consists of a substantially cylindrical housing 6, which encloses a downwardly open cavity 7. In the illustrated embodiment, the housing 6 of the Saugdüseneinsatzes 5 in its upper region a conical portion 9.

The cavity 7 has from top to bottom according to the arrangement in Fig. 1 the following parts: a nozzle 22, an injection space 23, a Venturi tube 24 and a sleeve 25 for connecting the cavity 7 with the sand conveyor line 8. The Venturi tube 24 consists essentially of two oppositely directed cones, which at the site their smallest diameter are united by a short section just this, constant diameter. Furthermore, the cavity 7 is connected to the interior of the storage container 2 via at least one suction channel 10 for sand. The suction channel 10 in this case has an outer opening 11 which is arranged on the outside of the housing on the side of the interior of the storage container 2, and an inner opening 12 in the cavity 7 of the housing 6 of the Saugdüseneinsatzes 5. The suction channel 10 is in the direction of the inner opening 12 to the outer opening 11 inclined at an acute angle to the central axis 16 of the Saugdüseneinsatzes 5 downwards, so that the outer opening 11 is located at a vertical arrangement of the Saugdüseneinsatzes 5 below the inner opening 12. The angle is usually 40 ° plus minus 10 percent and is substantially dependent on the size of the suction channels or the suction channel 10 and the remaining wall thickness of the housing 6 in this area. Another parameter may be the specific angle of repose of the brake sand used. In the present case four suction channels 10 are provided - in principle, however, more or fewer suction channels 10 are possible.

In the sectional view in Fig. 4 along the line CC in Fig. 3 two further features of the Saugdüseneinsatzes 5 can be seen: In the part of the housing 6, located in Fig. 4 is located to the left of the cavity 7, a ventilation channel 13 can be seen in the right part of the cavity 7, a compressed air channel 26 is arranged. The compressed air channel 26 opens in the region above the nozzle 22 into the cavity 7. The compressed air channel 26 can be acted upon via a compressor or via the on-board air pressure of the rail vehicle with compressed air. The ventilation duct 13 has an outlet opening 15, which in Fig. 4 only recognizable as an oval-shaped structure. The inlet opening 14 of the ventilation duct 13 is arranged in the present embodiment on the underside of the Saugdüseneinsatzes 5, but this represents only one of several possible variants. At least one ventilation channel 13 is provided, of course, the number may be larger. In the illustrated embodiment, three ventilation channels 13 are provided, as shown Fig. 3 is recognizable.

Fig. 5 shows a section through the suction nozzle insert 5 along the line DD in Fig. 3 , which is exactly executed by a ventilation duct 13. Here, the ventilation duct 13 and its inlet (14) and outlet opening 15 are clearly visible. The main part of the ventilation channel 13 is arranged substantially parallel to the central axis 16 of the housing of the Saugdüseneinsatzes 5, 5 'in the housing and is flowed through by the inlet opening 14 in the direction of a conical portion 9 of the Saugdüseneinsatzes 5, 5'. The end portion of the ventilation duct 13 just before the outlet opening 15 is inclined at an acute angle to the central axis 16 of the Saugdüseneinsatzes 5 down so that the outlet opening 15 of the ventilation channel 13 is oriented away from the conical portion 9, which, however, represents only one of several embodiments.

The synopsis of Fig. 2 and Fig. 5 shows an embodiment of the invention in which the outlet opening 15 of the ventilation channel 13 is arranged above the outer opening 11 of the suction channel 10. This outlet opening 15 may in principle be provided below or at the same height with the outer opening 11.

Subsequently, the operation of the Sandaustragungseinrichtung 1 will be described: The in FIGS. 2 . 3, 4 and 5 illustrated suction nozzle insert 5 is arranged on the conically converging bottom of a reservoir 2 for brake sand. If brake sand on the rails is required to start or brake the rail vehicle, the compressed air channel 26 is pressurized with compressed air. The pressure is about 1 bar, but may vary depending on the situation.

The compressed air flows through the compressed air channel 26 into the suction nozzle insert 5 and through the nozzle 22 at high speed in the injection space 23 and then passes through the venturi tube 24 and through the connected to the sleeve 25 sand conveyor line 8 through the sand bell 21 back out of the system out. Due to the high speed and the venturi tube 24, a negative pressure is created in the injection space 23 which sucks the sand from the surrounding reservoir 2 through the suction channels 10. The sand, which penetrates into the injection space 23, is then entrained by the jet of compressed air penetrating through the nozzle 22. Thus, a brake sand compressed air mixture is produced, which is discharged via the sand conveying line 8 through the sand bell 21. The oblique course of the suction channel 10 prevents sand from penetrating into the injection space 23 and further into the sand conveying line 8 as a result of vibrations, if no sanding command is given.

In previously known Sandaustragungseinrichtungen it often comes to difficulties to deploy constant amounts of sand, regardless of the filling level of the reservoir 2: On the one hand, the sand can interlock by jarring and clump what to May cause difficulties in the supply of any existing Saugdüseneinsätze. In addition, this problem can be additionally reinforced by any existing moisture in the reservoir 2.

In order to counteract the first problem, the sand discharge device 1 according to the invention has two features: On the one hand, at least one ventilation channel 13 is provided, whose outlet opening 15 is arranged above the outer opening 11 of the suction channel 10, for example. As a result, the sand above the opening of the suction channel 10 is vented and loosened, whereby clumping and gearing are effectively prevented. Furthermore, the conical portion 9 in the upper region of the housing 6 in the transition region to the cylindrical portion of the housing 6 has a larger diameter than the underlying cylindrical portion. The conical portion 9 thus projects beyond the cylindrical region of the housing 6 - the radius of this annular cover is greater by the amount x than the radius of the underlying cylindrical portion of the housing 6. This amount x is a maximum of 25 percent of the radius of the cylindrical portion ,

The conical portion 9 of the housing 6 takes by its configuration the majority of the load of the accumulated over the suction nozzle insert 5 sand. In the vicinity of the cylindrical housing 6, from which the sand is sucked through the suction channel 10 in the suction nozzle insert 5, the sand is therefore exposed to lower pressure and can be easily sucked. This ensures a uniform, continuous sand application.

Furthermore, the surface of the conical portion 9 of the housing 6 ideally has an angle of inclination which is greater by one track than the angle of repose of sand and in the range of 30 ° to 40 °. Thus, the sand slips even at low level of the reservoir 2 from the conical section 9 and is available for spreading available.

In a further embodiment of the invention, the suction nozzle insert 5 can be arranged inclined in the storage container 2. This means that the center axis 16 of the Saugdüseneinsatzes 5 is inclined to the vertical - usually by an angle α, wherein for the angle α is: 0 ° <α ≤ 30 °.

As a result, in practice often results in a cheaper to be laid sand conveyor line 8 in the form of better drainage slopes and more moderate curves. This leads to improved reliability due to more favorable flow conditions of the brake sand-air mixture. Fig. 1a shows a section of Sandaustragungseinrichtung Fig. 1 , wherein here suction nozzle inserts 5a, 5a 'are shown, which are inclined at such an angle α to the vertical. A suction nozzle insert 5a is arranged here at the bottom of the storage container 2, while a suction nozzle insert 5a 'at another area, in the present case at the conically converging bottom area, is arranged.

Another problem with sand discharge equipment, which has been described above, is moisture in the sand. On the one hand, the sand can lump more easily, at low temperatures it can even cause the sand to freeze.

To counteract this problem, according to the invention a dehumidifying means 17 is arranged in the sand discharge device, which is arranged detachably within the storage container 2. This feature of the invention is in the FIGS. 6 and 7 illustrated in a variant in which the dehumidifying means 17 is arranged on the lid 3 of the Sandeinfüllstutzens 4 of the reservoir 2. In principle, however, the dehumidifying agent 17 can be attached anywhere in the storage container 2.

Fig. 6 shows a section of a reservoir 2 with a Sandeinfüllstutzen 4 and a lid 3 in the closed state. The lid 3 in this case has a dehumidifying agent 17 located in a container 19 - these are, for example, silica gel, silica gel or comparable drying agents. The container is detachably connected to the lid, for example, a magnetic closure 18 may be provided. In principle, however, any closures are possible. The container may, for example, be a perforated cage made of a metal, for example stainless steel.

The advantages of such a device are out Fig. 7 recognizable, showing the lid 3 in the open state: The container 19 can be removed very easily by the detachable closure and exchanged or baked. The drying device is therefore reusable and therefore saves costs.

By reducing the moisture in the storage container 2 of the sand discharge device and the ventilated suction nozzle insert 5 with the conical portion 9 in the upper area, which absorbs the load of the overlying sand, an optimal sand application is achieved.

LIST OF REFERENCE NUMBERS

1

Sand discharge device

2

reservoir

3

cover

4

Sandeinfüllstutzen

5, 5 '

Suction nozzle insert (5a, 5a ')

6

cylindrical housing

7

cavity

8, 8 '

Sand conveying line

9

cone-shaped section

10

suction

11

outer opening

12

inner opening

13

ventilation duct

14

inlet opening

15

outlet opening

16

central axis

17

dehumidifying

18

magnetic closure

19

container

20

window

21, 21 '

sandy bell

22

jet

23

injection room

24

Venturi

25

sleeve

26

Compressed air duct

Claims (12)

1. Sand delivery device (1) for a railway vehicle, comprising

   - a storage container (2) configured to receive the sand and having a conically converging bottom, and

   - at least one suction nozzle insert (5, 5') positioned at the lowermost position of the conically converging bottom of the container (2) and protruding at least partially into the container (2), said suction nozzle insert (5, 5') comprising a substantially cylindrical housing (6) having a cavity (7) which is open at the bottom and to which a sand conveying line (8) is connectable, and said suction nozzle insert (5, 5') being configured for being traversed by an air flow parallel to a central axis (16) of the cylindrical housing (6) towards said sand conveying line (8), wherein the cylindrical housing (6) is further provided with at least one suction channel (10) preferably in a region within the container (2), said suction channel (10) connecting the cavity (7) of the suction nozzle insert (5, 5') with the interior of the container (2) and comprising an outer opening (11), which ends in the container (2) at the outer surface of the housing (6) of the suction nozzle insert (5, 5'), and an inner opening (12) ending in the cavity (7),
   characterized in that
   said suction channel (10) is tilted downward at an acute angle from the central axis (16) of the housing (6) and
   the housing (6) further comprises a venting channel (13) having an inlet (14) and an outlet (15), said outlet (15) ending in the container (2) within the sand delivery device (1).
2. The sand delivery device according to claim 1, characterized in that the outlet (15) of the venting channel (13) ends in the container (2) above the outer opening (11) of the suction channel (10).
3. The sand delivery device according to claim 1 or 2, characterized in that the inlet (14) of the venting channel (13) communicates with the ambient atmosphere of the railway vehicle or a cabin of the railway vehicle.
4. The sand delivery device according to any one of claims 1 to 3, characterized in that the major part of the venting channel (13) is disposed within the housing (6) of the suction nozzle insert (5, 5') extending substantially parallel to the central axis (16) of the housing, whereas an end section of the venting channel (13) is, immediately next to the outlet (15), tilted downward an at an acute angle from the central axis (16) of the housing (6).
5. The sand delivery device according to any one of claims 1 to 4, characterized in that the housing (6) of the suction nozzle insert (5, 5') comprises a substantially conical section (9) at its top, said substantially conical section having, in a transitional region to the cylindrical portion of the housing (6), a diameter greater than that of the cylindrical portion of the housing (6) and forming an annular cover protruding beyond the cylindrical surface of the housing (6).
6. The sand delivery device according to claim 5, characterized in that the annular cover protrudes by a distance x beyond the cylindrical surface of the housing (6), said distance x being 25 per cent at maximum of the radius of the cylindrical surface of the housing (6).
7. The sand delivery device according to any one of claims 1 to 6, characterized in that the suction nozzle insert (5, 5') is disposed within the container (2) such that its central axis (16) is oriented substantially vertical.
8. The sand delivery device according to any one of claims 1 to 6, characterized in that the central axis (16) is tilted at an angle α, from the vertical, with said angle α holding 0° < α ≤ 30°.
9. The sand delivery device according to any one of claims 1 to 8, characterized in that a receptacle (19) including a dehumidifying agent is detachably provided within the container (2).
10. The sand delivery device according to claim 9, characterized in that the container (2) comprises a filler neck (4) for charging sand, said filler neck being closeable by means of a cap (3), and the receptacle (19) is disposed detachable at an inner side of said cap (3).
11. The sand delivery device according to claim 9 or 10, characterized in that the receptacle (19) is realized as a perforated cage.
12. The sand delivery device according to any one of claims 9 to 11, characterized in that the receptacle (19) is disposed within the container (2) or at the cap (3) by means of a detachable magnetic fastener (18)

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