Collecting apparatus for air grinder

Abstract

The present invention relates to a dust collection device for an air grinder for collecting dust discharged from an air grinder, comprising: a cyclone configured to suck in dust discharged from an air grinder and separate the sucked dust into relatively heavy dust, relatively light fine particles, and air by centrifugal force and inertial force; an ejector connected above the cyclone and configured to suck in compressed air discharged from the air grinder; and a collection container connected below the cyclone.

Description

Technology Field

[0001] The present invention relates to a dust collection device for an air grinder, and more specifically, to a dust collection device for an air grinder that not only collects dust discharged from a grinder more efficiently but also offers advantages in portability and usability. Background Technology

[0002] As is well known, a grinder is configured to perform a grinding operation (sweeping) to remove various contaminants contaminated on the surface of a coating film or to smooth the outer surface of a target, such as the deck of a ship, before applying a finishing coat to the surface of various target sites. The grinder is configured to rotate a grinding plate by electricity or high-pressure air, and can be classified into electric grinders and air grinders depending on the type of driving force that rotates the grinder's grinding plate.

[0003] Electric grinders have relatively low torque compared to their weight, making them difficult to apply in large-scale operations, and they pose safety issues due to their electrical drive. Consequently, for large-scale operations, air grinders driven by high-pressure air are used because they are portable and relatively safe.

[0004] An air grinder comprises a grinding plate and an air hose that supplies high-pressure air to drive the grinding plate. The air grinder generates dust through the rotation of the grinding plate. If this dust spreads into the workspace, it is not only harmful to the worker but also contaminates the workspace, hindering smooth operation. To prevent this, a dust collection device may be connected to the air grinder. The dust collection device includes a collection container that collects dust discharged from the air grinder through a collection hose.

[0005] However, existing collection devices had the disadvantage that the dust collection efficiency was significantly reduced because it was difficult to generate negative pressure inside the collection container during dust collection, and dust flowed back from the collection container to the air grinder due to back pressure.

[0006] In addition, the collection containers of existing collection devices were made of metal materials such as steel to effectively perform functions like airtightness and negative pressure generation, but this resulted in a heavy weight, which had the disadvantage of making it difficult to transport between work zones.

[0007] The matters described in this background technology section are written to enhance understanding of the background of the invention and may include matters that are not prior art already known to those skilled in the art to which this technology belongs. The problem to be solved

[0008] The present invention has been devised in consideration of the above points, and aims to provide a dust collection device for an air grinder that not only collects dust discharged from the grinder more efficiently but also offers advantages in portability and usability.

[0009] The problems intended to be solved in the embodiments are not limited thereto, and may also include objectives or effects that can be identified from the means of solving the problems or the embodiments described below. means of solving the problem

[0010] The present invention, for achieving the above-mentioned purpose, is a dust collection device for an air grinder for collecting dust discharged from an air grinder, comprising: a cyclone configured to suck in dust discharged from an air grinder and separate the sucked dust into relatively heavy dust, relatively light fine particles, and air by centrifugal force and inertial force; an ejector connected above the cyclone and configured to suck in compressed air discharged from the air grinder; and a collection container connected below the cyclone.

[0011] It may further include a dust discharge pipe configured to connect the air grinder and the cyclone. Dust discharged from the air grinder may be configured to be sucked into the cyclone through the dust discharge pipe.

[0012] The above cyclone may include a mounting pipe provided at the upper center thereof. The mounting pipe is configured to communicate with the internal space of the cyclone, and the ejector may be mounted on the mounting pipe.

[0013] The above cyclone has an inlet pipe extending in the direction of its outer diameter, and the inlet pipe may extend in the tangential direction of the outer surface of the cyclone.

[0014] It may further include a compressed air discharge pipe configured to connect the air grinder and the ejector. The compressed air discharged from the air grinder may be configured to be sucked into the ejector through the compressed air discharge pipe.

[0015] The above ejector may include an ejector body comprising a first inlet connected to a compressed air discharge pipe and a second inlet communicating with the cyclone; and a nozzle member mounted inside the ejector body and configured to spray compressed air, having a plurality of nozzle orifices.

[0016] Each nozzle orifice extends along the radial direction of the nozzle member, each nozzle orifice is inclined toward the upper center of the nozzle member, and a plurality of nozzle orifices may be spaced apart in the circumferential direction of the nozzle member.

[0017] It may further include a filter mounted on the top of the above-mentioned ejector.

[0018] The above ejector may further include an outlet member mounted on the top of the ejector. The filter may be detachably mounted to the outlet member of the ejector.

[0019] The above-mentioned collection container may include a support surface provided at its upper portion. The support surface may have a collection opening that accommodates the lower portion of the cyclone.

[0020] The above-described collection device may further include a transport cart configured to move the collection container.

[0021] The above transport cart may include a base on which the bottom of the collection container is supported, a plurality of wheels mounted on the bottom surface of the base, and a plurality of supporting side walls extending upward from the edge of the base. Effects of the invention

[0022] According to the present invention, compressed air can be discharged to the outside by passing through an ejector connected to the upper part of the cyclone, and as a negative pressure is generated above the cyclone, dust can be reliably sucked from the air grinder into the interior of the cyclone through the dust discharge pipe, thereby significantly improving the dust collection efficiency and reliably preventing dust from flowing back from the cyclone to the air grinder.

[0023] According to the present invention, the collection container can be made of a relatively lightweight material such as plastic, and thus the collection container can be easily moved between work zones. Brief explanation of the drawing

[0024] FIG. 1 is a schematic diagram illustrating an air grinder system according to an embodiment of the present invention. FIG. 2 is a side view illustrating a collection device for an air grinder according to an embodiment of the present invention. Figure 3 is a view taken from the direction of arrow A in Figure 2. FIG. 4 is a drawing illustrating a cyclone of a collection device for an air grinder according to an embodiment of the present invention. Figure 5 is a drawing along the line BB of Figure 4. Figure 6 is a drawing along the CC line of Figure 4. Figure 7 is a drawing along the DD line of Figure 6. FIG. 8 is a cross-sectional view illustrating an ejector of a collection device for an air grinder according to an embodiment of the present invention. Figure 9 is a drawing along the EE line of Figure 8. FIG. 10 is a drawing showing an ejector and a filter mounted on the top of the ejector of a collection device for an air grinder according to an embodiment of the present invention. FIG. 11 is a cross-sectional view illustrating a collection container of a collection device for an air grinder according to an embodiment of the present invention. Figure 12 is a view taken from the direction of arrow F in Figure 11. FIG. 13 is a side view illustrating a transport cart of a collection device for an air grinder according to an embodiment of the present invention. Figure 14 is a view taken from the G direction of Figure 13. Specific details for implementing the invention

[0025] Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that in assigning reference numerals to the components of each drawing, the same components are given the same reference numeral whenever possible, even if they are shown in different drawings. Furthermore, in describing the embodiments of the present invention, if it is determined that a detailed description of related known components or functions would hinder understanding of the embodiments of the present invention, such detailed description is omitted.

[0026] In describing the components of the embodiments of the present invention, terms such as first, second, A, B, (a), (b), etc., may be used. These terms are used merely to distinguish the components from other components, and the essence, order, or sequence of the components is not limited by the terms used.

[0027] In an embodiment of the present invention, the singular form may include the plural form unless specifically mentioned in the text, and when described as "at least one of A and B and C (or more than one)," it may include one or more of all combinations that can be formed from A, B, and C.

[0028] And, where it is stated that a component is 'connected', 'combined', or 'connected' to another component, this may include not only cases where the component is directly connected, combined, or connected to the other component, but also cases where it is 'connected', 'combined', or 'connected' due to another component located between the component and the other component.

[0029] Furthermore, when described as being formed or placed "above or below" each component, "above" or "below" includes not only cases where two components are in direct contact with each other, but also cases where one or more other components are formed or placed between the two components. Additionally, when expressed as "above or below," it may include the meaning of a downward direction as well as an upward direction relative to a single component.

[0030] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which the present invention pertains. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an ideal or overly formal sense unless explicitly defined in this application.

[0031] Referring to FIG. 1, an air grinder system (1) according to an embodiment of the present invention may include an air grinder (3) and a collection device (10) for collecting dust discharged from the air grinder (3).

[0032] The air grinder (3) may be configured to receive high-pressure air and rotate the grinding plate (5) to grind the outer surface of the target area. The air grinder (3) may include a rotatable grinding plate (5) and a rotating unit (6) configured to rotate the grinding plate (5). The air grinder (3) may include a housing (4) and a dust cover (7) mounted on the bottom of the housing (4).

[0033] By housing the rotating unit (6) in the housing (4), the rotating unit (6) can be protected within the housing (4). By configuring the dust cover (7) to surround the polishing plate (5), dust generated by the polishing operation of the polishing plate (5) can be prevented from scattering to the outside.

[0034] The polishing plate (5) can be connected to a rotating unit (6), and a compressed air supply pipe (8) can be connected to the rotating unit (6). High-pressure compressed air is supplied from a compressor into the rotating unit (6) through the compressed air supply pipe (8), thereby allowing the rotating unit (6) to rotate the polishing plate (5). The polishing plate (5) can be replaced with various types to polish the outer surface of the target area while rotating.

[0035] The collection device (10) may be configured to collect dust discharged from an air grinder (3). Referring to FIGS. 1, 2, and 3, the collection device (10) may include a cyclone (11) configured to suck in dust discharged from an air grinder (3), an ejector (13) positioned above the cyclone (11), and a collection container (15) connected to the bottom of the cyclone (11).

[0036] Referring to FIG. 1, the collection device (10) may include a dust discharge pipe (12) configured to fluidly connect an air grinder (3) and a cyclone (11). The inlet of the dust discharge pipe (12) may be connected to the dust cover (7) of the air grinder (3), and the outlet of the dust discharge pipe (12) may be connected to the inlet pipe (11a) of the cyclone (11) through a connector (12a). Dust generated by the grinding operation of the grinding plate (5) may be sucked from the dust cover (7) of the air grinder (3) through the dust discharge pipe (12) into the internal space of the cyclone (11) of the collection device (10).

[0037] The cyclone (11) can be configured to suck in dust by a swirling motion and to separate the sucked dust into relatively heavy dust, relatively light fine particles, and air by centrifugal force and inertial force.

[0038] Referring to FIGS. 4 and 5, the cyclone (11) may have an inlet pipe (11a) provided at its upper portion, and the inlet pipe (11a) may extend along the tangential direction of the outer surface of the cyclone (11). The cyclone (11) may be conical in shape, with its diameter decreasing toward its lower portion, and the cyclone (11) may have a cylindrical inner surface structure to induce a swirling motion of dust entering into it. Referring to FIG. 2, a dust discharge pipe (12) may be connected to the inlet pipe (11a) through a connector (12a).

[0039] Referring to FIG. 4, the cyclone (11) may include a mounting pipe (14) provided at its upper center. Referring to FIG. 5, the mounting pipe (14) may be configured to communicate with the internal space of the cyclone (11) at the upper center of the cyclone (11). Referring to FIG. 2 and FIG. 3, the ejector (13) may communicate with the internal space of the cyclone (11) by being mounted on the mounting pipe (14).

[0040] Referring to FIGS. 4 and 6, the cyclone (11) may include a plurality of mounting bosses (17) provided at its lower portion, and each mounting boss (17) may have a mounting hole (17a). Referring to FIG. 7, the cyclone (11) may be fixed to the support wall (15a) of the collection container (15) by fastening a plurality of screws (18) to the plurality of mounting bosses (17).

[0041] Referring to FIG. 1, the collection device (10) may include a compressed air discharge pipe (9) configured to fluidly connect the rotating unit (6) and the ejector (13) of the air grinder (3). The inlet of the compressed air discharge pipe (9) may be connected to the rotating unit (6), and the outlet of the compressed air discharge pipe (9) may be connected to the ejector (13). The compressed air discharged from the rotating unit (6) may flow into the ejector (13) of the collection device (10) through the compressed air discharge pipe (9).

[0042] The ejector (13) can be connected to the top of the cyclone (11), and the ejector (13) can be configured to suck in compressed air discharged from the rotating unit (6) of the air grinder (3). The compressed air discharged from the rotating unit (6) of the air grinder (3) can be sucked into the ejector (13) through the compressed air discharge pipe (9). The compressed air can be discharged to the outside by passing through the ejector (13) connected to the top of the cyclone (11), and thus, negative pressure is generated above the cyclone (11), thereby ensuring that dust is reliably sucked from the air grinder (3) into the interior of the cyclone (11) through the dust discharge pipe (12), and that the dust is reliably prevented from flowing back from the cyclone (11) to the air grinder (3).

[0043] Referring to FIG. 8, the ejector (13) may include an ejector body (31) including a first inlet (31a) provided on its side wall and a second inlet (31b) provided at its bottom, a nozzle member (32) mounted inside the ejector body (31), and an outlet member (33) provided at the outlet of the ejector body (31).

[0044] Referring to FIG. 8, the ejector body (31) may have a cavity (31c) limited therein, and the first inlet (31a) and the second inlet (31b) may communicate with the cavity (31c). The cavity (31c) may be cylindrical in shape.

[0045] Referring to FIG. 8, the first inlet (31a) may be provided on one side wall of the ejector body (31), and the outlet of the compressed air discharge pipe (9) may be sealedly connected to the first inlet (31a). Compressed air (CA) passing through the compressed air discharge pipe (9) may flow into the first inlet (31a).

[0046] Referring to FIG. 8, the second inlet (31b) may be formed at the bottom of the ejector body (31), and the second inlet (31b) may be in the shape of a nozzle that narrows in width from the bottom to the top. Referring to FIG. 10, the bottom of the ejector body (31) may be sealedly fitted into the mounting pipe (14).

[0047] The second inlet (31b) of the ejector body (31) can communicate with the internal space of the cyclone (11) through the mounting pipe (14), and among the dust sucked into the internal space of the cyclone (11), light air and fine particles (MA) are drawn into the second inlet (31b) by the compressed air (CA) flowing into the first inlet (31a), so that the dust sucked into the cyclone (11) can be collected in the collection container (15) through the lower part of the cyclone (11), and the relatively light air and fine particles (MA) can pass through the ejector (13) and move to the upper part, thereby effectively separating the dust sucked into the cyclone (11) into heavy dust and relatively light air and fine particles (MA).

[0048] Referring to FIG. 10, the lower end of the ejector body (31) of the ejector (13) is fitted into the mounting pipe (14), so that the second inlet (31b) of the ejector body (31) can fluidly communicate with the mounting pipe (14).

[0049] Referring to FIG. 8, a nozzle member (32) may be mounted in a cavity (31c) of an ejector body (31), and the nozzle member (32) may have a cavity (32c) limited therein, with the upper and lower ends of the cavity (32c) open. The cavity (32c) of the nozzle member (32) may communicate with the first inlet (31a) and the second inlet (31b) of the ejector body (31). The nozzle member (32) may be sealedly installed within the cavity (31c) of the ejector body (31) by means of an upper sealing member (34a) provided at the top and a lower sealing member (34b) provided at the bottom.

[0050] Referring to FIG. 8, the nozzle member (32) may include a groove (32b) provided on its outer surface and a plurality of nozzle orifices (32a) communicating with the groove (32b). The groove (32b) may communicate directly with the first inlet (31a) of the ejector body (31), and the plurality of nozzle orifices (32a) may communicate with the first inlet (31a) of the ejector body (31) through the groove (32b). The plurality of nozzle orifices (32a) may be configured to spray compressed air toward the upper center of the ejector (13). Each nozzle orifice (32a) may be inclined from the groove (32b) toward the upper center of the nozzle member (32), and each nozzle orifice (32a) may communicate with the groove (32b) of the nozzle member (32) and the upper opening of the nozzle member (32). Accordingly, compressed air introduced from the first inlet (31a) can be sprayed toward the outlet member (33) through the upper opening of the nozzle member (32) after passing through a plurality of nozzle orifices (32a).

[0051] Referring to FIG. 9, each nozzle orifice (32a) may be extended along the radial direction of the nozzle member (32), and the plurality of nozzle orifices (32a) may be spaced apart in the circumferential direction of the nozzle member (32), so that the plurality of nozzle orifices (32a) may be arranged radially.

[0052] Referring to FIG. 8, the outlet member (33) may have a cavity (33c) limited therein, and the cavity (33c) may have an open top and bottom. A mixing space (33d) may be formed at the bottom of the cavity (33c), and the mixing space (33d) may be configured in the shape of a nozzle that narrows in width from the bottom toward the top. The outlet member (33) may be mounted on the top of the ejector body (31) to communicate with the cavity (32c) of the nozzle member (32) and the nozzle orifice (32a) of the nozzle member (32). The outlet member (33) may include a base part (33a) fixed to the top of the ejector body (31) through a fastener or the like, and a mounting projection (33b) protruding upward from the base part (33a). The mounting projection (33b) may have a male screw thread formed on its outer surface.

[0053] Referring to FIGS. 1 and 2, the collection device (10) may further include a filter (16) mounted on the top of the ejector (13). Referring to FIG. 10, the filter (16) may be mounted on an outlet member (33) of the ejector (13). The filter (16) may include a filter housing (16a), a filter element (16b) disposed within the filter housing (16a), and a mounting socket (16c) fixed to the bottom of the filter housing (16a). The filter housing (16a) may be a cylindrical frame having openings provided on its sides and top, and the filter element (16b) may have a hollow portion formed in its center, and the filter element (16b) may be disposed inside the filter housing (16a). The filter element (16b) may include an upper portion covering the upper part of the filter housing (16a) and a side portion covering the side of the filter housing (16a), and thus the filter element (16b) may be configured to cover the upper and side of the filter housing (16a) from within the filter housing (16a). Accordingly, light air and fine particles separated by the ejector (13) and the cyclone (11) can pass through the filter (16), and the fine particles are filtered by the filter element (16b) of the filter (16), and only relatively clean air can be discharged to the outside. The mounting socket (16c) may have female screw threads formed on its inner surface. The outlet member (33) can be mounted to the mounting socket (16c) by screwing the mounting projection (33b) of the outlet member (33) to the mounting socket (16c).

[0054] The collection container (15) can be fluidly connected below the cyclone (11), and the collection container (15) can be configured to collect relatively heavy dust by the cyclone (11). According to one embodiment, it can be made of a relatively light material such as plastic, and thus the collection container (15) can be easily moved between work zones.

[0055] Referring to FIG. 11, the collection container (15) may have a collection space (15d) limited therein, and dust discharged from the air grinder (3) may be received in the collection space (15d). The collection container (15) may include a support wall (15a) provided on its upper side, and the support wall (15a) may be recessed from the top of the collection container (15). Referring to FIG. 11 and FIG. 12, a collection opening (15b) and a discharge opening (15c) may be provided in the support wall (15a). Referring to FIG. 12, a mounting area in which mounting bosses (17) of the cyclone (11) are mounted may be provided around the collection opening (15b).

[0056] Referring to FIG. 7, the cyclone (11) can be fluidly connected to the collection container (15) by receiving the lower end (11b) of the cyclone (11) into the collection opening (15b).

[0057] A stopper (19) can be detachably coupled to the discharge opening (15c), and the stopper (19) may include a rubber material. Referring to FIG. 11, the collection opening (15b) of the collection container (15) can be sealed to the outside by the stopper (19) being coupled to the discharge opening (15c). By separating the stopper (19) from the discharge opening (15c), dust contained in the collection space (15d) of the collection container (15) can be discharged to the outside through the discharge opening (15c).

[0058] Referring to FIGS. 2 and 3, the collection device (10) may include a transport cart (20) configured to move a collection container (15). The transport cart (20) may be configured to support the collection container (15), and the collection container (15) may be detachably mounted on the transport cart (20).

[0059] Referring to FIGS. 13 and 14, the transport cart (20) may include a base (21), a plurality of wheels (22) mounted on the bottom surface of the base (21), and a plurality of support side walls (23) extending upward from the edge of the base (21).

[0060] Referring to FIG. 14, the base (21) can be configured in a cross shape, and when the collection container (15) is mounted on the transport cart (20), the bottom of the collection container (15) can be supported on the base (21).

[0061] Referring to FIG. 13, a plurality of supporting side walls (23) may extend vertically from the edge of the base (21). For example, the plurality of supporting side walls (23) may be composed of four corresponding to the cross shape of the base (21). When the collection container (15) is mounted on the transport cart (20), at least some of the side walls of the collection container (15) may be supported by the plurality of supporting side walls (23).

[0062] The transport cart (20) may further include a handle (24) pivotably mounted on at least some of the supporting side walls (23). Accordingly, the mobility of the transport cart (20) can be facilitated as a worker grasps the handle (24).

[0063] The above description is merely an illustrative explanation of the technical concept of the present invention, and those skilled in the art to which the present invention pertains will be able to make various modifications and variations within the scope of the essential characteristics of the present invention.

[0064] Accordingly, the embodiments disclosed in this invention are intended to illustrate, not limit, the technical concept of the invention, and the scope of the technical concept of the invention is not limited by these embodiments. The scope of protection of this invention shall be interpreted by the claims below, and all technical concepts within an equivalent scope shall be interpreted as being included within the scope of rights of this invention. Explanation of the symbols

[0065] 1: Air Grinder System 3: Air Grinder 4: Housing 5: Grinding plate 6: Rotating unit 7: Dust cover 8: Compressed air supply piping 9: Compressed air discharge pipe 10: Collection device 11: Cyclone 11a: Inlet pipe 12: Dust discharge pipe 12a: Connector 13: Ejector 14: Mounting pipe 15: Collection container 15a: Support surface 15b: Collection opening 15c: Exhaust opening 15d: Collection space 16: Filter 16a: Filter housing 16b: Filter element 16c: Mounting socket 17: Equipped Boss 17a: Mounting hole 18: Screw 19: Stopper 20: Transport cart 21: Bass 22: Wheel 23: Supporting sidewall 24: Handle 31: Ejector body 31a: First entrance 31b: Second entrance 31c: Cavity 32: Nozzle member 32a: Nozzle orifice 32b: Home 32c: Cavity 33: Outlet Member 33a: Base section 33b: Mounting protrusion 33c: Cavity 33d: Mixed space 34a: Upper sealing member 34b: Lower sealing member

Claims

Claim 1 A collection device for an air grinder for collecting dust discharged from an air grinder, comprising: a cyclone configured to suck in dust discharged from the air grinder and separate the sucked dust into relatively heavy dust, relatively light fine particles, and air by centrifugal force and inertial force; an ejector connected above the cyclone and configured to suck in compressed air discharged from the air grinder; and a collection container connected below the cyclone. Claim 2 A collection device for an air grinder according to claim 1, further comprising a dust discharge pipe configured to connect the air grinder and the cyclone, wherein dust discharged from the air grinder is sucked into the cyclone through the dust discharge pipe. Claim 3 In claim 1, the cyclone includes a mounting pipe provided at the upper center thereof, the mounting pipe is configured to communicate with the internal space of the cyclone, and the ejector is a collecting device for an air grinder mounted on the mounting pipe. Claim 4 A collecting device for an air grinder according to claim 1, wherein the cyclone has an inlet pipe extending in the direction of its outer diameter, and the inlet pipe extends in the tangential direction of the outer surface of the cyclone. Claim 5 A collection device for an air grinder according to claim 1, further comprising a compressed air discharge pipe configured to connect the air grinder and the ejector, wherein the compressed air discharged from the air grinder is sucked into the ejector through the compressed air discharge pipe. Claim 6 A collecting device for an air grinder according to claim 1, wherein the ejector comprises: an ejector body including a first inlet connected to a compressed air discharge pipe and a second inlet communicating with the cyclone; and a nozzle member mounted inside the ejector body and configured to spray compressed air, having a plurality of nozzle orifices. Claim 7 A collecting device for an air grinder according to claim 6, wherein each nozzle orifice extends along the radial direction of the nozzle member, each nozzle orifice is inclined toward the upper center of the nozzle member, and a plurality of nozzle orifices are spaced apart in the circumferential direction of the nozzle member. Claim 8 A collection device for an air grinder according to claim 1, further comprising a filter mounted on the top of the ejector. Claim 9 A collecting device for an air grinder according to claim 8, wherein the ejector further comprises an outlet member mounted on the top of the ejector, and the filter is detachably mounted on the outlet member of the ejector. Claim 10 A collecting device for an air grinder according to claim 1, wherein the collecting container includes a support surface provided at its upper end, and the support surface has a collecting opening that accommodates the lower end of the cyclone. Claim 11 A collecting device for an air grinder according to claim 1, wherein the collecting device further comprises a transport cart configured to move the collecting container. Claim 12 A collecting device for an air grinder according to claim 11, wherein the transport trolley comprises a base on which the bottom of the collecting container is supported, a plurality of wheels mounted on the bottom surface of the base, and a plurality of supporting side walls extending upward from the edge of the base.

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