CN218684750U - Fixing structure of sand outlet pipe and powder tank - Google Patents

Abstract

The embodiment of the utility model discloses go out fixed knot of sand pipe constructs and powder jar, include: a sand outlet pipe; the air guide pipe is sleeved outside the sand outlet pipe, and the sand outlet pipe and the air guide pipe are coaxially arranged; the sand pipe supporting piece is arranged on the air guide pipe, the sand pipe supporting piece is sleeved outside the sand outlet pipe and located at the top of the sand outlet pipe, and the sand pipe supporting piece is used for radially supporting the sand outlet pipe. The utility model provides a fixed knot of sand outlet pipe constructs through setting up sand pipe support piece on the air duct to locate the top of sand outlet pipe with sand pipe support piece cover, with radially supporting the sand outlet pipe, avoided the sand outlet pipe the condition that rocks to appear, improved the stability and the homogeneity of sand outlet pipe sanding.

Description

Fixing structure of sand outlet pipe and powder tank

Technical Field

The utility model relates to the technical field of medical equipment, more specifically says, relates to a fixed knot of sand pipe constructs and powder jar.

Background

Powder jar among the dentistry sand blasting equipment includes casing, air duct and sand outlet pipe, and wherein, air duct and sand outlet pipe all are located inside the casing. Carry out the sandblast during operation, with in the high-pressure draught input air duct, under high-pressure draught's effect, the sand powder in the powder jar is raised to inside flowing into out the sand pipe through the sand inlet hole at play sand pipe top, the sand powder flows into the sandblast handle through a sand pipe, realizes the cleanness to the tooth by the shower nozzle blowout of sandblast handle.

In the prior art, the bottom of the sand outlet pipe is fixed on the base of the powder tank, and the sand outlet pipe is a slender pipe, so that when the sand outlet pipe is influenced by high-pressure airflow, the sand outlet pipe can shake, and the sand outlet stability and uniformity of the sand outlet pipe are influenced to a certain extent.

Therefore, when the sand outlet pipe is acted by the high-pressure airflow, how to reduce the shaking amplitude of the sand outlet pipe to ensure the sand outlet stability and uniformity of the sand outlet pipe becomes a technical problem to be solved by the technical personnel in the field.

SUMMERY OF THE UTILITY MODEL

In view of the above, an object of the present invention is to provide a fixing structure for a sand discharging pipe, so as to improve the stability of the sand discharging pipe;

another object of the utility model is to provide a powder jar of fixed knot who has above-mentioned sand outlet pipe constructs.

In order to achieve the above object, the utility model provides a following technical scheme:

a fixing structure of a sand discharging pipe for a powder tank, comprising:

a sand outlet pipe;

the air guide pipe is sleeved outside the sand outlet pipe, and the sand outlet pipe and the air guide pipe are coaxially arranged;

the sand pipe supporting piece is arranged on the air guide pipe, the sand pipe supporting piece is sleeved outside the sand outlet pipe and located at the top of the sand outlet pipe, and the sand pipe supporting piece is used for radially supporting the sand outlet pipe.

Optionally, in the fixing structure of the sand outlet pipe, the sand pipe supporting piece is arranged at the top end of the air guide pipe.

Optionally, in the fixing structure of the sand outlet pipe, the sand pipe supporting piece comprises a plug-in part and a pipe sleeve;

the pipe sleeve is sleeved on the sand outlet pipe and is in transition fit with the sand outlet pipe;

the number of the inserting parts is multiple, and the inserting parts are distributed in an annular array around the central shaft of the pipe sleeve; the top end of the air duct is provided with an air duct slot which is used for being clamped with the insertion part, and the air duct slot is in one-to-one correspondence with the insertion part.

Optionally, in the fixing structure of the sand discharge pipe, the insertion part includes a protruding part and an abutting part; the bulge part is clamped with the air pipe slot; the abutting part abuts against the inner wall of the air guide pipe.

Optionally, in the fixing structure of the sand outlet pipe, the sand pipe supporting piece is detachably connected to the air guide pipe.

Optionally, in the fixing structure of the sand outlet pipe, a pipe cap is arranged at the top end of the sand outlet pipe, and a sand inlet hole is formed in the pipe cap;

the pipe cap is detachably connected with the sand outlet pipe.

Optionally, in the fixing structure of the sand outlet pipe, an air pipe supporting piece is arranged on an outer wall of the air guide pipe, and the air guide pipe is supported inside the powder tank through the air pipe supporting piece.

Optionally, in the fixing structure of the sand outlet pipe, the air pipe support comprises a support part and a connecting part; the supporting part is fixed on the air guide pipe through the connecting part;

the connecting parts are distributed in an annular array around the central shaft of the air duct;

the supporting part is of an annular structure and is coaxially arranged with the gas guide pipe; the supporting part is in transition fit with the inner wall of the shell of the powder tank.

Optionally, in the fixing structure of the sand outlet pipe, a base is disposed at the bottom of the sand outlet pipe; the base comprises a plug, the plug is inserted into an insertion hole in the bottom of the shell of the powder tank, and a sealing ring is arranged between the plug and the insertion hole;

the base is provided with a communication hole and a connecting hole, and the communication hole is used for inserting the sand discharging pipe therein and is in clearance fit with the communication hole;

the bottom end of the sand outlet pipe is inserted into the connecting hole, and the connecting hole is in transition fit with the sand outlet pipe;

the connecting hole and the communicating hole are coaxially arranged with the shell of the powder tank.

Optionally, in the fixing structure of the sand outlet pipe, the base is detachably connected to the housing of the powder tank.

A powder tank comprises a sand outlet pipe fixing structure and a shell, wherein a sand storage area is arranged in the shell.

The utility model provides a fixed knot of sand outlet pipe constructs, and the outside of sand outlet pipe is located to the air duct cover, and sand outlet pipe and the coaxial setting of air duct, is provided with sand pipe support piece on the air duct, and wherein, the outside of sand outlet pipe is located to sand pipe support piece cover, and is located the top of sand outlet pipe to radially supporting sand outlet pipe, improved sand outlet pipe's steadiness, avoided sand outlet pipe because of receiving the high-pressure draught condition that appears rocking.

Compared with the prior art, the utility model provides a fixed knot of sand outlet pipe constructs through setting up sand pipe support piece on the air duct to locate the top of sand outlet pipe with sand pipe support piece cover, with radially supporting the sand outlet pipe, avoided the sand outlet pipe the condition that rocks to appear, improved the stability and the homogeneity of sand outlet pipe sanding.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a schematic structural view of a fixing structure of a sand outlet pipe provided by an embodiment of the present invention;

fig. 2 is a front view of a fixing structure of a sand outlet pipe provided by the embodiment of the present invention;

FIG. 3 isbase:Sub>A cross-sectional view taken along line A-A of FIG. 2;

fig. 4 is a schematic structural view of a sand outlet pipe provided in an embodiment of the present invention;

fig. 5 is an isometric view of a sand pipe supporting member according to a first embodiment of the present invention;

fig. 6 is a top view of a sand pipe supporting member according to an embodiment of the present invention;

fig. 7 is a top view of a sand pipe supporting member according to a second embodiment of the present invention;

fig. 8 is an isometric view of a tracheal support provided in accordance with an embodiment of the present invention;

fig. 9 is a top view of a tracheal support provided in accordance with an embodiment of the present invention;

fig. 10 is a top view of the trachea support according to the second embodiment of the present invention;

fig. 11 is a front view of a base according to an embodiment of the present invention;

fig. 12 is a sectional view taken along line B-B in fig. 11.

Wherein, 100 is a shell, 101 is a sand storage area, 200 is a sand outlet pipe, 201 is a first sand pipe support member, 2011 is a plug-in part, 2012 is a pipe sleeve, 202 is a pipe cap, 203 is a sand inlet hole, 204 is a second sand pipe support member, 2041 is a sand pipe connecting part, 300 is an air duct, 301 is a first air duct support member, 3011 is a first supporting part, 3012 is a first connecting part, 302 is an air inlet hole, 303 is an air duct slot, 304 is a second air duct support member, 3041 is a second supporting part, 3042 is a second connecting part, 400 is a base, 401 is a plug, 402 is a communication hole, 403 is a connection hole, 404 is a bolt mounting hole, and 405 is a seal ring mounting groove.

Detailed Description

The core of the utility model lies in providing a fixing structure of the sand outlet pipe, so as to improve the stability of the sand outlet pipe;

another core of the utility model is to provide a powder tank with the above sand outlet pipe fixing structure.

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.

As shown in fig. 1 to fig. 3, the embodiment of the utility model discloses a fixed knot of sand outlet pipe constructs, including sand outlet pipe 200, air duct 300 and sand pipe support piece. It should be noted that the present embodiment is mainly applied to the field of dental blasting equipment, and more specifically, to a powder tank, and of course, other fields may also be applied, and it is within the protection scope of the present application as long as the structure disclosed in the present embodiment is adopted.

Wherein, in order to guarantee the homogeneity and the stability of the play sand of play sand pipe 200, the outside of a sand pipe 200 is located to air duct 300 cover, and just goes out sand pipe 200 and the coaxial setting of air duct 300. It should be noted that, the coaxial arrangement of the sand discharge pipe 200 and the air duct 300 means that the central axis of the sand discharge pipe 200 coincides with the central axis of the air duct 300.

Because the sand outlet pipe 200 is relatively slender and is very easy to shake, the stability of sand discharging of the sand outlet pipe 200 is influenced, therefore, in order to prevent the sand outlet pipe 200 from being in a working state, the shaking condition is influenced to the uniformity and the stability of sand discharging of the sand outlet pipe 200, as shown in fig. 1 and fig. 4, a sand pipe supporting piece is arranged on the air duct 300, the sand pipe supporting piece is sleeved outside the sand outlet pipe 200 and is positioned at the top of the sand outlet pipe 200, the sand outlet pipe 200 is supported in the radial direction, and the influence caused by entering of the sand outlet pipe 200 from the air duct 300 after the air flow and the sand powder are mixed is reduced.

In an embodiment, after the high-pressure air flow enters the sand storage area 101 through the air inlet hole 302, the sand powder at the bottom of the sand storage area 101 of the powder tank is blown up, and a mixture of the air flow and the sand powder (referred to as air-sand mixture) is formed, and under the action of the high-pressure air flow, the air-sand mixture is conveyed into the air duct 300 from the bottom of the air duct 300 and flows out from the top of the air duct 300. When gas-sand mixture flowed through air duct 300, can exert an influence to setting up the sand outlet pipe 200 at air duct 300 inside for sand outlet pipe 200 is easily rocking along radial direction, owing to receive the supporting role at radial direction of the sand pipe support piece that sets up in sand outlet pipe 200 top, has restricted sand outlet pipe 200 and has moved in radial direction, has weakened the influence that sand outlet pipe 200 rocked, makes to obtain sand outlet pipe 200 and go out the sand more stable.

The utility model provides a fixed knot of sand outlet pipe constructs, the outside of sand outlet pipe 200 is located to air duct 300 cover, and sand outlet pipe 200 and the coaxial setting of air duct 300, be provided with sand pipe support piece on air duct 300, wherein, the outside of sand outlet pipe 200 is located to sand pipe support piece cover, and is located sand outlet pipe 200's top to radially supporting sand outlet pipe 200, improved sand outlet pipe's steadiness, avoided sand outlet pipe 200 to appear the condition of rocking because of receiving the high-pressure draught effect.

Compared with the prior art, the utility model provides a fixed knot of sand outlet pipe constructs through setting up sand pipe support piece on air duct 300 to locate sand outlet pipe 200's top with sand pipe support piece cover, with radially supporting sand outlet pipe 200, avoided sand outlet pipe 200 the condition that rocks to appear, improved sand outlet pipe 200 sand outlet's stability and homogeneity.

Further, as shown in fig. 3, when the air duct 300 and the sand outlet pipe 200 are blocked, in order to facilitate cleaning the air duct 300 and the sand outlet pipe 200, the sand pipe support is detachably fixed to the top end of the air duct 300 by means of plugging, sleeving, and the like, and the sand pipe support has two embodiments, and for convenience of understanding, the sand pipe supports of the two embodiments are respectively defined as a first sand pipe support 201 and a second sand pipe support 204.

In an embodiment, as shown in fig. 5 and 6, the first sand pipe supporting member 201 includes a plug 2011 and a sleeve 2012, wherein the sleeve 2012 is sleeved on the sand discharging pipe 200, and the sleeve 2012 is in transition fit with the sand discharging pipe 200. The grafting portion 2011 is a plurality of, and grafting portion 2011 is three in this embodiment, and grafting portion 2011 is the annular array distribution around the center pin of pipe box 2012, and the top of air duct 300 is provided with the trachea slot 303 that is used for with grafting portion 2011 joint, and trachea slot 303 and grafting portion 2011 one-to-one setting. Enclose the first exhaust hole that forms air feed sand mixture exhaust air duct 300 with the inner wall of air duct 300 between adjacent grafting portion 2011, get into air duct 300 back by first exhaust hole when air and sand mixture by air duct 300 bottom, discharge, finally get into out sand pipe 200, flow into the sandblast handle that the doctor used by a sand pipe 200 again. Specifically, the plug 2011 includes a protrusion and an abutting portion, wherein the protrusion is connected to the air tube slot 303, and the abutting portion abuts against the inner wall of the air tube 300. It should be noted that, the protruding portion and the abutting portion may be an integrated structure, such as an L-shaped structure, but of course, the protruding portion and the abutting portion may also be a split structure, and the protruding portion and the abutting portion are preferably integrated in the present embodiment, which facilitates the production of the first sand pipe supporting member 201.

In another embodiment, as shown in fig. 7, the second sand tube supporting member 204 is composed of an inner tube and an outer tube, which are coaxial, the inner tube is sleeved outside the sand outlet tube 200 and is in transition fit with the sand outlet tube, the outer wall of the outer tube is provided with external threads, and the inner wall of the top of the air duct 300 is provided with internal threads corresponding to the external threads. The inner pipe and the outer pipe are connected by a plurality of sand pipe connecting portions 2041, and a second exhaust hole for exhausting the air-supply sand mixture from the air duct 300 is formed between the adjacent sand pipe connecting portions 2041. When the air-sand mixture enters the air duct 300 from the bottom of the air duct 300, the air-sand mixture is discharged from the second exhaust hole, finally enters the sand outlet pipe 200, and then flows into the sand blasting handle used by the doctor through the sand outlet pipe 200.

Further, as shown in fig. 1 and fig. 3, a pipe cap 202 is disposed at the top end of the sand outlet pipe 200, a sand inlet hole 203 is disposed on the pipe cap 202, and the pipe cap 202 and the sand outlet pipe 200 can be connected by a thread for facilitating the repair of the sand outlet pipe 200 and the pipe cap 202. It should be noted that, after the air-sand mixture is discharged from the top of the air duct 300, the air-sand mixture enters the sand outlet pipe 200 through the sand inlet hole 203 provided on the pipe cap 202, and flows into the sand blasting handle used by the doctor through the sand outlet pipe 200.

Further, as shown in fig. 3 and 8, a tracheal supporter is provided on an outer wall of the tracheal tube 300, the tracheal tube 300 is supported inside the powder tank by the tracheal supporter, and the tracheal supporter has two embodiments, which are defined as a first tracheal supporter 301 and a second tracheal supporter 304, respectively, for convenience of understanding.

In a particular embodiment, as shown in fig. 8 and 9, the first gas tube support 301 includes a first support portion 3011 and a first connection portion 3012. The first supporting portion 3011 is fixed on the air duct 300 through the first connecting portion 3012, wherein the first supporting portion 3011, the first connecting portion 3012 and the air duct 300 can be of an integrated structure. Specifically, the first connection portions 3012 are plural, and the number of the first connection portions 3012 in this embodiment is three, where the first connection portions 3012 are distributed in an annular array around the central axis of the air duct 300, the first support portions 3011 are in an annular structure and are disposed coaxially with the air duct 300, and the first support portions 3011 are in transition fit with the inner wall of the housing 100 of the powder container. The air duct 300 is supported in the radial and vertical directions by the first air duct supporting member 301 to prevent the air duct 300 from shaking, thereby causing the sand outlet pipe 200 to shake. It should be noted that, the first connecting portions 3012 are distributed in an annular array around the central axis of the airway tube 300, which means that the included angle between two adjacent first connecting portions 3012 is the same, that is, the first connecting portions 3012 are uniformly arranged around the central axis of the airway tube 300.

In order to save cost, in another embodiment, as shown in fig. 10, the second air pipe supporting member 304 includes a second supporting portion 3041 and a second connecting portion 3042. The second supporting portion 3041 is fixed on the air guiding tube 300 by a second connecting portion 3042, wherein the second supporting portion 3041, the second connecting portion 3042 and the air guiding tube 300 can be an integrated structure. Specifically, there are a plurality of second connecting portions 3042, in this embodiment, there are three second connecting portions 3042, the second supporting portions 3041 and the second connecting portions 3042 are disposed in a one-to-one correspondence, the second connecting portions 3042 are distributed in an annular array around the central axis of the air duct 300, and the second supporting portions 3041 are in transition fit with the inner wall of the housing 100 of the powder container. It should be noted that the one-to-one arrangement of the second supporting portions 3041 and the second connecting portions 3042 means that each second connecting portion 3042 is provided with an arc-shaped second supporting portion 3041. The fact that the second connecting portions 3042 are distributed in an annular array around the central axis of the airway tube 300 means that the included angles between two adjacent second connecting portions 3042 are the same, i.e. the second connecting portions 3042 are uniformly arranged around the central axis of the airway tube 300.

Further, as shown in fig. 11 and 12, a base 400 is provided at the bottom of the sand outlet pipe 200. Wherein, the base includes plug 401, and plug 401 inserts to being located the jack of the casing 100 bottom of powder jar in, and is provided with the sealing washer between plug 401 and the jack, is provided with the sealing washer mounting groove 405 that is used for installing the sealing washer at the top of plug 401 to make plug 401 and sand storage area 101 lateral wall sealing connection. Further, a connecting hole 403 and a communicating hole 402 are formed in the base 400, the bottom end of the sand discharging pipe 200 is inserted into the connecting hole 403, the connecting hole 403 is in transition fit with the sand discharging pipe 200, the communicating hole 402 is communicated with the connecting hole 403, and the communicating hole 402 is in clearance fit with the sand discharging pipe 200. Note that the center axes of the connection hole 403 and the communication hole 402 both coincide with the center axis of the housing 100 of the powder tank.

As shown in fig. 12, a bolt mounting hole 404 is provided on the base 400 for fixedly connecting the base 400 and the housing 100 of the powder container by a screw.

The embodiment of the utility model provides a still disclose a powder jar, including the fixed knot structure and the casing 100 of sand outlet pipe, this sand outlet pipe's fixed knot constructs for the fixed knot that sand outlet pipe as above embodiment discloses, consequently has all technological effects of the fixed knot structure of above-mentioned sand outlet pipe concurrently, and this text is no longer repeated herein. Wherein a sealing cap is mounted on the top of the housing 100 before the sand blasting operation.

Further, as shown in fig. 3 and 12, a sand storage area 101 is provided in the housing 100, and an air inlet of the air duct 300 faces vertically downward. The high-pressure air flows into the annular air flow channel formed between the sand outlet pipe 200 and the communication hole 402 through the air inlet hole 302, and flows from the top end of the air flow channel to the air inlet of the air duct 300.

The top end of the air flow channel is located at the lowest position of the sand storage area 101, and a certain distance is reserved between the air flow channel and the air inlet hole of the air duct 300. When the high-pressure air flows to the air inlet of the air duct 300 through the space, the sand powder near the space is lifted by the high-pressure air and flows into the air duct 300, so that an air-sand mixture is formed.

Under the action of the high-pressure air flow, the air-sand mixture flows into the air duct 300 from the air inlet of the air duct 300 and then is discharged from the air outlet at the top of the air duct 300. The sand mixture discharged from the air duct 300 enters the sand outlet pipe 200 through the sand inlet hole 203 under the action of the air flow, flows into a connecting pipe connected with the sand blasting handle through the bottom of the sand outlet pipe 200, and finally enters the sand blasting handle used by a doctor. It should be noted that the connecting pipe can be communicated with the bottom end of the sand outlet conduit through a pipe joint.

The terms "first" and "second," and the like in the description and claims of the present invention and the above-described drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not set forth for a listed step or element but may include steps or elements not listed.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. The utility model provides a fixed knot of sand outlet pipe constructs for powder jar, its characterized in that includes:

a sand outlet pipe (200);

the air guide pipe (300) is sleeved outside the sand outlet pipe (200), and the sand outlet pipe (200) and the air guide pipe (300) are coaxially arranged;

the sand pipe supporting piece is arranged on the air guide pipe (300), the sand pipe supporting piece is sleeved outside the sand outlet pipe (200) and located at the top of the sand outlet pipe (200), and the sand pipe supporting piece is used for radially supporting the sand outlet pipe (200).

2. The fixing structure of the sand discharging pipe according to claim 1, wherein the sand pipe supporting member is provided at the top end of the air guide pipe (300).

3. A sand pipe fixing structure according to claim 2, wherein the sand pipe support comprises a spigot (2011) and a socket (2012);

the pipe sleeve (2012) is sleeved on the sand outlet pipe (200), and the pipe sleeve (2012) is in transition fit with the sand outlet pipe (200);

the inserting parts (2011) are multiple, and the inserting parts (2011) are distributed in an annular array around the central axis of the pipe sleeve (2012); the top of air duct (300) is provided with be used for with trachea slot (303) of grafting portion (2011) joint, just trachea slot (303) with grafting portion (2011) one-to-one sets up.

4. A fixing structure of a sand discharge pipe according to claim 3, wherein the inserting part (2011) comprises a projecting part and an abutting part; the bulge part is clamped with the air pipe slot (303); the abutting part abuts against the inner wall of the air guide pipe (300).

5. The fixing structure of the sand pipe according to claim 1, wherein the sand pipe supporter is detachably attached to the air duct (300).

6. The fixing structure of the sand producing pipe according to the claim 1, characterized in that the top end of the sand producing pipe (200) is provided with a pipe cap (202), and the pipe cap (202) is provided with a sand inlet (203);

the pipe cap (202) is detachably connected with the sand outlet pipe (200).

7. The fixing structure of the sand outlet pipe according to claim 1, wherein a tracheal support is provided on the outer wall of the tracheal tube (300), and the tracheal tube (300) is supported inside the powder tank through the tracheal support.

8. The fixing structure of a sand discharge pipe according to claim 7, wherein the air pipe support comprises a support portion and a connecting portion; the supporting part is fixed on the air duct (300) through the connecting part;

the connecting parts are distributed in an annular array around the central axis of the air duct (300);

the supporting part is of an annular structure and is coaxially arranged with the air duct (300); the supporting part is in transition fit with the inner wall of the shell (100) of the powder tank.

9. The fixing structure of the sand discharging pipe according to claim 1, wherein a base (400) is provided at the bottom of the sand discharging pipe (200); the base comprises a plug (401), the plug (401) is inserted into a jack at the bottom of the shell (100) of the powder tank, and a sealing ring is arranged between the plug (401) and the jack;

a communication hole (402) and a connection hole (403) are formed in the base (400), the communication hole (402) is used for inserting the sand outlet pipe (200) therein, and is in clearance fit with the communication hole (402);

the bottom end of the sand outlet pipe (200) is inserted into the connecting hole (403), and the connecting hole (403) is in transition fit with the sand outlet pipe (200);

the connecting hole (403) and the communicating hole (402) are arranged coaxially with the housing (100) of the powder tank.

10. Powder tank, characterized in that it comprises a fixed structure of a sand outlet pipe according to any one of claims 1 to 9 and a housing (100), and a sand storage area (101) is arranged in the housing (100).

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