NL2022878B1 - Dust collector system with rotatable bag carrier. - Google Patents

Abstract

Pre—separator device (30) for pre-separating dust particles from an influent air stream, comprising a cyclone housing (100) for generating a cyclone flow path for an air stream in a 5 cyclone chamber, a shutter (17) for closing off the cyclone housing (100) at a bottom region, a pre-separator retainer (18) for holding a dust bag (19) below the shutter (17); wherein the pre-separator (10) comprises a framework (20) with a framework base (200) for supporting the dust bag (19), characterised in that a bag carrier (205) for carrying a bag is rotatable connected to the framework base (200), such that a rotation of the bag carrier (205) 10 causes a carried dust bag (19) to twist to close the dust bag. Fig. 4

Description

P34026NL0O0/KHO Title: Dust collector system with rotatable bag carrier. The present invention relates to a dust collector system for collecting dust particles from a floor surface. The dust collector system comprises a dust collector machine and/or a pre- separator. Further, the invention relates to a method for changing a filed bag of the dust collector system. EP0318308 discloses a vacuum loader to remove, collect, seal and dispose hazardous material, like asbestos. The vacuum loader is provided with a separate bagger unit. The bagger unit has a first cyclone to partially dedust and a separate a substantial amount of particulates from a dusty fluid. The bagger unit has a vacuum operated bagger assembly with an upper bulk separation chamber for containing the first cyclone. The separation chamber has a radial inlet port communicating with the first cyclone to feed an influent dusty air stream into the first cyclone. The separation chamber also has an outlet port which communicates with the first cyclone to discharge partially dedusted effluent air from the cyclone. A lower dispensing chamber is positioned below the separation chamber. The lower dispensing chamber has a tubular vacuum cylinder. The vacuum cylinder has an open ended lower discharge portion with a downwardly facing discharge mouth. The lower discharge portion is configured for connecting an elongated expandable transparent bag. The bag is positioned externally about, abuts against, and is sealed to the outside surface of an upright cylindrical wall of the tubular vacuum cylinder.

The bagger unit is provided with a framework which has a U-shaped support base with optional wheels are casters. The support base can be positioned upon a floor to stabilise and support the bagger assembly. An elongated upright arm is spaced rearwardly of the bagger assembly and extends above the support base to a height above the vacuum cylinder. A horizontal overhead arm is provided at a top end of the upright arm for holding the bagger assembly. A platen is provided to support and seal a bottom of the bag. The platen comprises a substantially horizontal, arcuate support platform with a straight front edge and an elastomeric pad. The platen has an upright curved arcuate wall portion which provides a back to abbutingly engage and support a side portion of the bag. The platen is movable by a

-2- pneumatic power assembly to move the platen up and down. By operating a pedal valve, an operator can selectively move the platen. In operation, an air stream enters the bagger unit and the first cyclone centrifugally separates out the bulk of material from the air stream for depositing directly into the bag. An operator can lower the platen with the partially filled bag. Thereafter, the operator will stop the platen’s descent, spin the filled bag to achieve a long twist for tape, tie or heat seal the bag, and then cut the bag twist at a centre or between ties. The operator will remove the bag from the platen and transfer the bag to storage and disposal. During removal of the filled bag, the vacuum pump engine and blower will continue to run to provide a continuous negative airflow For a convenient use, this know vacuum loader with bagger unit has several disadvantages. The general object of the present invention is to at least partially eliminate the above mentioned drawbacks and/or to provide a usable alternative. More specific, it is an object of the invention to provide a dust collector system which is convenient in use. According to a first aspect of the invention, this object is achieved by a dust collector system according to claim 1.

The dust collector system is arranged for vacuuming dust particles from a floor surface. In particular, the dust collector system is an industrial dust collector system. More in particular, the dust collector system is configured to be connected to a floor machining equipment for abrasively removing particles from a floor surface, like a shot blasting, grinding or scarifying machine equipment. The dust collector system comprises a dust collector machine and/or a pre-separator. The dust collector machine and pre-separator are configured to cooperate and have each a distinct technical function.

The dust collector machine is arranged for generating an air stream and filtering dust particles from the air stream. The dust collector machine comprises the machine housing for housing components. The machine housing has an air inlet and an air outlet. One of the components is a section device for generating the air stream which flows in operation from the air inlet to the air outlet. Another component is a filter. The filter is disposed in between the air inlet and the air outlet. The filter is arranged for filtering dust particles from the air stream.

-3- The pre-separator is arranged for pre-separating dust particles from an influent air stream. The pre-separator is connectable to the air inlet of the dust collector machine. Generally a flexible air hose is used to fluidly connect the pre-separator and the dust collector machine. The pre-separator comprises a cyclone housing. The cyclone housing is arranged generating a cyclone flow path. When generating the air stream, the air stream follows the cyclone flow path in a cyclone chamber. The cyclone housing has an inlet for an ingress of the air stream into the cyclone housing and an outlet for an egress of the air stream out of the cyclone housing. A shutter is provided to close off the cyclone housing at a bottom region. The shutter has a shutter housing which is connected to the bottom end of the cyclone housing. The shutter housing houses a shutter member which is operable to close off or open the bottom region of the cyclone housing. Further, the pre-separator comprises a pre-separator retainer. The pre-separator retainer is arranged for holding a dust collector, e.g. a collection bag or bin, below the shutter. In operation, the dust collector suspended by the retainer is filled under gravity.

The dust collector machine and pre-separator each comprises a framework for holding components. The dust collector machine has a framework for holding the machine housing and the pre-separator has a framework for holding the cyclone housing. At least one of these frameworks comprises a framework base which is positioned below a retainer of the dust collector machine or of the pre-separator.

According to the first aspect of the invention an improvement is provided by a bag carrier which is rotatable connected to the framework base. The bag carrier can be rotated for closing a filled bag. Preferably, the bag carrier is manually rotatable by an operator. By rotating the bag carrier, a supported bag on the bag carrier is also rotated and will get twisted. The twist of the bag forms a closure and the operator may secure this closure by using a closure member, e.g. a cable tie. After securing the closure of the bag, the bag can be cut off and removed from the bag carrier.

The first aspect of the invention may provide several benefits. Advantageously, the rotatable bag carrier may prevent a relative shifting of a collection bag which might scratch or otherwise damage the collection bag. In particular, in cleaning operations in which hazardous particles, like asbestos particles are present, a carefully handling of the collection bag is required. In such an appliance of the dust collector system, the rotatable bag carrier contributes to a more safe operation.

-4- Another advantage may be that the rotatable bag carrier intuitively stimulates an operator to close a bag in a proper manner. In case that an operator is not familiar in closing a collection bag or in using an endless bagging system, the rotatable bag carrier intuitively teaches the user to rotate the bag for closing it. A filled bag on the bag carrier can be quickly and easily closed by the operator by simply rotating the bag carrier.

In an embodiment of the dust collector system, the bag carrier is freely rotatable with respect to the framework base. The bag carrier may comprise a bag carrier body, in particular a bag carrier plate, which is supported by a bearing in between the bag carrier plate and the framework base. As such, the bag carrier can advantageously be constructed in a simple manner.

In a further embodiment of the dust collector system, the bag carrier may have a bag carrier grip to be gripped by the operator to rotate a bag carrier body. The bag carrier grip may be positioned at an outer contour to be accessible for the operator. The bag carrier may further comprise a gear in between the bag carrier grip and the bag carrier body to transfer a movement of the operator. Herewith, a small movement induced by the operator may be converted to a relatively large rotation of the bag carrier body.

In an embodiment of the dust collector system, the dust collector is an endless bagging system for providing a plurality of bags formable on board of the dust collector system. An example of such an endless bagging system is a Longopac bagging system. In particular, the dust collector has a capacity for collecting dust particles of at least 10 kg which is functional in an industrial environment.

In an embodiment of the dust collector system, both the pre-separator and the dust collector machine are configured to collect dust particles in a dust bag. Preferably, both the pre- separator and the dust collector machine comprise a retainer which both have the same configuration for retaining a same dust collector, in particular for retaining a same endless bagging system. Both retainers have preferably a same gutter portion for receiving a same and this bagging system.

Further, the invention relates to a method for changing a bag of a dust collector system, wherein use is made of a rotatable bag carrier to close the bag.

According to a second aspect of the invention, an improvement is provided to make the pre- separator mare convenient in use by providing a lightweight cyclone housing.

-5- According to the second aspect, the invention provides a dust collector system for vacuuming dust particles from a floor surface comprising: a dust collector machine for generating an air stream and filtering dust particles from the air stream comprising: a machine housing for housing components, in which the machine housing has an air inlet and an air outlet ; a suction device housed in the machine housing for generating the air stream flowing from the air inlet to the air outlet ; a filter disposed in between the air inlet and the air outlet for filtering dust particles from the air stream; and/or a pre-separator for pre-separating dust particles from an influent air stream which pre- separator is connectable to the air inlet of the dust collector machine comprising: a cyclone housing for generating a cyclone flow path for an air stream in a cyclone chamber; the cyclone housing having an inlet for an ingress of the air stream into the cyclone chamber and an outlet for an egress of the air stream out of the cyclone chamber; a shutter for closing off the cyclone housing at a bottom region having a shutter housing connected to the bottom end of the cyclone housing for housing a shutter member which is operable to close off or open the bottom region of the cyclone housing; a pre-separator retainer for holding a dust collector , wherein the pre-separator retainer is positioned below the shutter; wherein at least one of the dust collector machine and pre-separator comprises a framework provided with a framework base for supporting a dust collector which framework base is positioned below a retainer for retaining a dust collector which is improved by a cyclone housing produced by rotation moulding.

Preferably, the cyclone housing is made of a plastic material, in particular high-density polyethylene HDPE, by a rotation moulding process.

According to the second aspect, the invention provides a pre-separator which has a lightweight cyclone housing.

To obtain a lightweight configuration having a weight of less than 10 kg, the cyclone housing is made of a plastic material by rotation moulding.

Particularly, the cyclone housing has a constant wall thickness obtained by rotation moulding.

The cyclone housing preferably has a smooth outer appearance which contributes in obtaining the substantially constant wall thickness during rotation moulding.

The substantially constant wall thickness provides a smooth inner surface inside the cyclone chamber which advantageously contributes in a higher performance of cyclone separation.

A smooth outer appearance means that the cyclone housing is preferably configured without protruding elements at an outer surface.

-6- Preferably, the plastic material of the cyclone housing is high-density polyethylene HDPE which provides advantageously a high wear resistance in an abrasive environment.

By using HDPE material and by providing a wall thickness of at least 5 mm, the cyclone housing may have a wear resistance which is required in an industrial environment in which an abrasive floor machining equipment is used.

Advantageously, further technical measures to increase a wear resistance of the cyclone chamber, like an insertion of a metal wear elements behind the inlet, may be redundant.

The lightweight pre-separator may provide several advantages.

A major advantage is that the lightweight cyclone housing of at most 10 kg, in particular at most 7 kg can conveniently be carried by an operator.

In an embodiment of the pre-separator according to the second aspect, the shutter is produced by a 3D printing production process.

The shutter has a shutter housing which has an open worked inner structure.

The shutter housing has an inner structure which is full of cavities which advantageously contribute to a reduction of weight of the pre-separator.

In an embodiment of the pre-separator according to the second aspect, the cyclone housing has a cylindrical housing portion and a funnel-shaped housing portion in which the shutter is connected to a bottom end of the funnel-shaped housing portion.

The inlet of the cyclone housing is tangentially positioned at a circumferential outer wall of the cylindrical housing portion.

The outlet of the cyclone housing is axially positioned on top of the cylindrical housing portion.

The funnel-shaped housing portion extends downwardly in between the cylindrical housing portion and the shutter.

An inner cyclone chamber is formed by the cylindrical and funnel-shaped housing portion and has a cyclone length in the axial direction extending from the inlet to the shutter.

Advantageously, an available height may be optimally used to obtain a large cyclone length which may contribute to a highly effective separation of dust particles.

According to a third aspect of the invention, an improvement is provided to make the pre- separator more convenient in use by enabling a quick connection or release of the pre- separator to the dust collector machine.

According to the third aspect, the invention provides a dust collector system for vacuuming dust particles from a floor surface comprising: a dust collector machine for generating an air stream and filtering dust particles from the air stream comprising:

-7- a machine housing for housing components, in which the machine housing has an air inlet and an air outlet ; a suction device housed in the machine housing for generating the air stream flowing from the air inlet to the air outlet ; a filter disposed in between the air inlet and the air outlet for filtering dust particles from the air stream; and/or a pre-separator for pre-separating dust particles from an influent air stream which pre- separator is connectable to the air inlet of the dust collector machine comprising: a cyclone housing for generating a cyclone flow path for an air stream in a cyclone chamber; the cyclone housing having an inlet for an ingress of the air stream into the cyclone chamber and an outlet for an egress of the air stream out of the cyclone chamber; a shutter for closing off the cyclone housing at a bottom region having a shutter housing connected to the bottom end of the cyclone housing for housing a shutter member which is operable to close off or open the bottom region of the cyclone housing; a pre-separator retainer for holding a dust collector , wherein the pre-separator retainer is positioned below the shutter; wherein at least one of the dust collector machine and pre-separator comprises a framework provided with a framework base for supporting a dust collector which framework base is positioned below a retainer for retaining a dust collector which is improved by a pre-separator framework which has a hook member which is hookable onto a complementary hook receiving member of the dust collector machine.

According to the third aspect of the invention, the pre-separator comprises a framework which can be hooked onto a dust collector machine.

The framework is a pickup framework.

The pre- separator can be used as a stand-alone device separate from the dust collector machine.

Preferably, the framework is L-shaped and made of bended steel pipe.

The framework comprises a pickup member, also called a hook member, to mount the framework to the dust collector machine by lifting the hook member across a complementarity member of the dust collector machine.

Preferably, the complementarity member is positioned at a side region of the dust collector machine, such that the pre-separator is mountable aside the dust collector machine.

In an embodiment of the pre-separator according to the third aspect, the pickup member is accompanied by a hold member to prevent the framework of the pre-separate to shift relative to the dust collector machine.

-8- According to a fourth aspect of the invention, an improvement is provided to make the pre- separator more convenient in use by allowing a quick release of the cyclone housing from the framework.

Such a quick release is for example beneficial in transporting the dust collector system by an automotive vehicle, an operators van.

Another advantage may be that the pre- separator of framework can be used as a trolley for transporting a filled dust collector.

According to the fourth aspect, the invention provides a dust collector system for vacuuming dust particles from a floor surface comprising: a dust collector machine for generating an air stream and filtering dust particles from the air stream comprising: a machine housing for housing components, in which the machine housing has an air inlet and an air outlet ; a suction device housed in the machine housing for generating the air stream flowing from the air inlet to the air outlet ; a filter disposed in between the air inlet and the air outlet for filtering dust particles from the air stream; and/or a pre-separator for pre-separating dust particles from an influent air stream which pre- separator is connectable to the air inlet of the dust collector machine comprising: a cyclone housing for generating a cyclone flow path for an air stream in a cyclone chamber; the cyclone housing having an inlet for an ingress of the air stream into the cyclone chamber and an outlet for an egress of the air stream out of the cyclone chamber; a shutter for closing off the cyclone housing at a bottom region having a shutter housing connected to the bottom end of the cyclone housing for housing a shutter member which is operable to close off or open the bottom region of the cyclone housing; a pre-separator retainer for holding a dust collector , wherein the pre-separator retainer is positioned below the shutter; wherein at least one of the dust collector machine and pre-separator comprises a framework provided with a framework base for supporting a dust collector which framework base is positioned below a retainer for retaining a dust collector which is improved by a pre-separator framework which has a bracket shaped holder for receiving the cyclone housing of the pre- separator, which bracket shaped holder preferably has a holder opening for radially receiving the cyclone housing, in particular the funnel-shaped housing portion, of the pre-separator.

According to the fourth aspect of the invention, the pre-separator comprises a framework which has a bracket shaped holder for receiving the cyclone housing.

The bracket shaped holder has a left and right bracket arm in which a receiving opening for receiving the cyclone

-9- housing is presented in between the bracket arms. Preferably, the cyclone housing comprises a cylindrical housing portion at the top region and a funnel-shaped housing portion at a bottom region, wherein the holder is configured to engage with the funnel-shaped housing portion. The pre-separator is releasably mounted to the framework. Advantageously, the bracket shaped holder allows a robust and quick mount and release of the cyclone housing. Thus, the above described aspects and features all contribute to the object of a convenient use. Each aspect is independently applicable.

The invention will be explained in more detail with reference to the appended drawings. The drawings show a practical embodiment according to the invention, which may not be interpreted as limiting the scope of the invention. Specific features may also be considered apart from the shown embodiment and may be taken into account in a broader context as a delimiting feature, not only for the shown embodiment but as a common feature for all embodiments falling within the scope of the appended claims, in which: Fig. 1 shows a perspective view of a dust collector system according to the invention including a dust collector machine and a pre-separator holded by a framework which is picked on a framework of the dust collector machine; Fig. 2 shows a frontal view of the dust collector system of Fig. 1; Fig. 3 shows a side view of the dust collector system of Fig. 1; Fig. 4 shows a perspective view of a pre-separator device having a pre-separator held by an L-shaped framework; Fig. 5 shows an enlarged view of a bottom region of the pre-separator device of Fig. 4; Fig. 6 shows a side view of the pre-separator device including a bag attached to a retainer of the pre-separator and carried by a rotatable bag retainer mounted to a frame base of the framework; Fig. 7 shows a frontal view of the pre-separator device as shown in Fig. 6.

Identical reference signs are used in the drawings to indicate identical or functionally similar components.

Fig. 1-3 show in a perspective, front and side view a dust collector system 1 which comprises a dust collector machine 9 and a pre-separator 10. Here, the pre-separator 10 is mounted to aside region of the dust collector machine 2. The pre-separator 10 is releasably connected to the dust collector machine 9 by a pre-separator framework 20.

-10- The dust collector machine 9 is configured to be used in an industrial environment. The dust collector machine 9 is particularly configured to be used in combination with a floor machining equipment for abrasively machining a floor surface, e.g. a floor grinding, shot blasting, scarifying or sanding machine. The dust collector machine 9 may be connectable by a suction hose to such a floor machining equipment or to a cleaning set with a mouth for collecting dust from a floor surface. The dust collector machine 9 is a mobile industrial vacuum cleaner. The dust collector machine 9 has a machine framework 90 provided with wheels 911 to allow the dust collector machine 9 being moved across a floor surface FS. The dust collector machine 9 may be manually driveable or motorised. The machine framework 90 may have a push bar 910 for pushing the dust collector machine 9 across the floor surface FS. The dust collector machine 9 may be autonomously self-driving or maybe driveable by an operator.

The dust collector machine 9 has a generally known configuration. The dust collector machine 9 has a machine housing 92 for housing components of the dust collector machine

9. At a front region, the dust collector machine 9 has an air inlet 94. A suction hose is connectable to the air inlet 94 for introducing an air stream into and through the machine housing 92 to an air outlet 95 at a top side of the machine housing 92. Cleaned air is discharged from the air outlet 95. The dust collector machine 9 has a suction device 93 for generating the air stream through the machine housing 92. The suction device 93 may comprise a suction fan or a compressor. Typically, the suction device 93 is positioned at a top region of the machine housing 92. The machine housing 92 comprises a dust chamber 920 for collecting dust particles and a dust filter 96 for filtering a passing air stream. The dust filter 96 is positioned below the suction device 93. Typically, the dust filter 96 is ring-shaped and positioned at a height level of the air inlet 94 for filtering an influent air stream. Dust particles separated from the air stream by the filter 96 may fall down by gravity to a lower region into the dust chamber 920. At the lower region, the dust chamber 920 may be provided with a shutter 97. The shutter 97 can be opened for discharging collected dust particles to a dust collector 99. The dust collector 99 may be a bin. Preferably, the dust collector 99 is a dust bag, more preferably the dust collector 99 is an endless bagging system, also called a drop-down bagging system, e.g. a Longopac. Many bags can be obtained from such a bagging system.

Each bag from the endless bagging system is formed by a sleeve shaped foil or in other words a hose of foil, a foil shaped as a tubular cylinder.

-11- In a packed state of the endless bagging system, the sleeve shaped foil may be wound or folded about its circumferential foil edge to form a ring-shaped roll. The roll is attachable to a retainer 98 at a lower region of the machine housing 92. In a generally know configuration, the retainer 98 may have a gutter portion 980 for receiving the ring-shaped roll. The sleeved foil has a free distal end formed by a circumferential foil edge. The distal end can be pulled downwardly across an outer gutter edge. The distal end can be pulled away from the roll below the retainer 98 to start forming a bag. When obtaining a desired bag length, the free distal end is closed off, e.g. by a tie rib or other seal member to form a bag below the machine housing 92. The machine framework 90 comprises a bag support 915 for supporting a bag below the retainer 98.

Further, figures 1-3 show the dust collector system including a pre-separator 10. The pre- separator 10 is a cyclone pre-separator. In operation, a cyclone flow is generated in a cyclone housing 100 of the pre-separator 10 for separating dust particles out of a passing air stream.

The pre-separator 10 has a pre-separator framework 20. Here, as explained in further detail hereafter, the pre-separator framework 20 is releasably connected to the machine framework 90 of the dust collector machine 9 and the pre-separator 10 is releasably connected to the pre-separator framework 20.

The pre-separator 10 has no own suction device. To generate an air stream through the cyclone housing 100, the pre-separator 10 is connectable to the air inlet 94 of the dust collector machine 9. The cyclone housing 100 has an inlet 104 and an outlet 105. The inlet 104 is connectable by an air hose to a cleaning set for cleaning a floor surface or a machining equipment for machining a floor surface. An air hose is connectable in between an outlet 105 of the pre-separator 10 and the air inlet 95 of the dust collector machine 9, such that in operation the suction device 93 of the dust collector machine 9 generates an air stream through the cyclone housing 100 of the pre-separator 10.

The cyclone housing 100 has a shape which is configured for generating a cyclone flow path in an inner cyclone chamber. The cyclone housing 100 is elongated and has an axial axis. In operation, the axial axis is a vertical axis. Here, the cyclone housing has a cylindrical housing portion 101 and a funnel-shaped housing portion 102. The cylindrical housing portion 101 is provided on top of the funnel -shaped housing portion 102. The cylindrical housing portion 101 has a circumferential wall with a constant outer diameter. The hollow cone forming the funnel-shaped housing portion 102 has a wide top end and a small bottom end. The wide top end is connected to the cylindrical housing portion 101.

-12- Preferably, the cylindrical housing portion 101 and the funnel -shaped housing portion 102 are produced as a one-piece item. The cyclone housing 100 can be produced out of plastic material by rotation moulding. Preferably, the cyclone housing 100 has a smooth outer surface which means that the outer surface has no protrusions, like fastening flanges etc.

Such a simple configuration is beneficial in providing the cyclone housing 100 by rotation moulding. Producing the cyclone housing 100 at least partially out of plastic material beneficially contributes to a lightweight pre-separator 10. Preferably, the funnel-shaped housing portion 102 is made of plastic material. More preferably, also the cylindrical housing portion 101 is made of a plastic material. In particular, at least the cylindrical housing portion 101 is made of a high-density polyethylene HDPE material. Preferably, the cylindrical housing portion 101 has a circumferential wall having a thickness of at least 5 mm. The pre-separator 10 is configured to be used in an industrial environment which requires a high wear resistance. Dust particles including concrete, metal or asbestos particles may be very abrasive. Advantageously, the HDPE material and the thickness of the circumferential wall of the cyclone housing 100 contributes to a wear resistance of the cyclone housing without implementing wear resistance elements inside the cyclone chamber. The inlet 104 is positioned at a top region of the cyclone housing 100. Here, the inlet 104 is tangentially oriented and positioned at a circumferential wall portion of the cylindrical housing portion 101. The outlet 105 is positioned at the top region of the cyclone housing 100. The outlet 105 is centrally positioned on top of the cyclone housing 100. The outlet 105 may be formed by an outlet tube which extends in the axial direction from the outside into the cyclone housing 100. The outlet tube may extend inside the cyclone housing 100 about a length of a cylindrical housing portion 101 height. An influent air stream is directed by the tangential inlet 104 along an inner side of the circumferential wall of the cylindrical housing portion 101. Under gravity, dust particles will fall down and separate from the air stream inside the cyclone housing 100. The dust particles will fall down through the funnel-shaped housing portion 102 to the bottom end of the cyclone housing 100.

At the bottom end, the pre-separator 10 has a shutter 17. The shutter 17 comprises a shutter member 172 which is movable arranged in a shutter housing 171. Here, the shutter housing 171 is disc-shaped. The shutter housing 171 has a circumferential outer surface. The shutter housing 171 has a receiving opening at the circumferential outer surface for receiving the shutter member 172.

The shutter housing 171 is made by a 3D printing process. Instead of a solid body obtained by moulding, by using a 3D printing process, the shutter housing 171 may have an open

-13- worked inner structure. The open worked inner structure is a structure which is full of cavities, e.g. a honeycombed structure. Herewith, the 3D printing process may beneficially contribute in obtaining a lightweight pre-separator 10. The shutter housing 171 has a discharge channel extending from an upper side to a bottom side. The shutter member is arranged to close off the discharge channel. The shutter member 172 is plate-shaped and slidable for opening or closing the discharge channel. Herewith, the shutter member 172 is slidable to open or close the bottom end of the funnel-shaped housing portion 102.

Here, the shutter member 172 is slidable in a radial direction. The shutter member 172 has a shutter grip 173 to be gripped by an operator for replacing a dust collector 19. The upper side of the shutter housing 171 is configured for a connection to the bottom end of the funnel-shaped housing portion 102. The discharge channel may be threaded at the upper side to engage at a threaded portion at the bottom end of the funnel-shaped housing portion

102. Herewith, the shutter housing 171 is simply mountable to the cyclone housing 100. The bottom side of the shutter housing 171 is configured for a connection to a retainer 18 for retaining the dust collector 19. The shutter housing 171 may have a bayonet closure member 177 at the bottom side to provide a quick release with a complementary bayonet closure member 187 of the retainer 18. One of the shutter housing 171 or the retainer 18 is provided with a cam for axial locking the retainer 18 to the shutter housing 171. The cam may be formed by the elevation in the axial direction on at least one of the bayonet closure members.

Preferably, the retainer 18 of the pre-separator 10 has a substantially same configuration as the retainer 98, such that the same type of dust collector 19 can be used for both the dust collector machine 9 and the pre-separator 10. As shown, the retainer 18 may have a gutter portion 180 for receiving an endless bagger system as described above.

In figures 1-3, the dust collector system 1 is shown in a mounted state in which the framework 20 of the pre-separator 10 is mounted to the dust collector machine 9. As shown here, the pre-separator 10 may be mounted at a side region of the dust collector 9. The framework 20 is mounted to the machine framework 90.

The framework 20 is wheeled. Wheels 220, 221 are mounted to the framework base 200 for riding the framework 20 on the floor surface FS. Here, the framework 20 has relatively large

-14 - wheels 220 at a back side B of the framework 20 and relatively small wheels 221 at a front side F of the framework 20. Here, the small wheels 221 are casters. The small wheels are arranged to swivel, while the large wheels 220 are fixed wheels. These large wheels 220 are non-rotatable about a vertical axis with respect to the framework 20. As shown in fig. 2, in the mounted state, the large wheels 220 are in a lifted position. The large wheels 220 are spaced from the floor surface FS. The large wheels 220 are arranged free from the floor surface FS, e.g. at a distance of at least 5 mm. The framework 20 is supported by the casters 221 Preferably, the framework 20 is fully suspended by the dust collector machine 9. When suspended, all wheels of the pre-separator framework 20 may be lifted from the ground.

Preferably, in a suspended state of the pre-separator framework 20, all wheels are spaced at a distance of at least 5 mm above the floor surface. Advantageously, this suspension of the framework 20 to the dust collector machine 9 contributes to a steerability of the dust collector system 1. Additionally, when the dust collector system 1 tilts, the caster wheels 221 may contact floor surface FS to provide stability.

In figures 4-8, the framework 20 and the pre-separator 10 are further shown as a stand-alone pre-separator device 30.

The framework 20 is L-shaped. The framework 20 may be shaped by bended tubular pipe.

The framework 20 has a framework base 200 and an upstanding framework portion 201. At a top region, the upstanding framework portion 201 is provided with a framework grip 202. The framework grip 202 allows an operator to manoeuvre the pre-separator device across the floor surface FS.

Fig. 5 shows the framework base 200 in an enlarged view. A bag carrier 205 is rotatably mounted to the framework base 200. An arrow indicates the rotatability of the bag carrier 205 around the axial axis S-S. The bag carrier 205 is supported on bearings 208 to allow a free rotation of the bag carrier 205. The bag carrier 205 may be provided with a bag carrier grip for manually rotating the bag carrier. The bag carrier grip may be positioned at an outer contour of the bag carrier 205. The rotatable bag carrier 205 contributes to a convenient closing of a filled bag 19. By rotating the bag carrier 205, the filled bag 19 will get twisted just below the retainer 18, such that the bag closes. The rotatable bag carrier 205 may prevent a shifting of the bag across the bag carrier which might otherwise damage the bag. After twisting the bag, an operator can easily apply a closure, like a tyrap around the twisted portion of the filled bag 19 and subsequently loosen the filled bag 19 from bagging system. Finally, the filled bag can be taken away from the pre-separator device.

-15- As shown, the framework 20 is provided with a pickup member 214 and a hold member 215 for releasably mounting framework 20 to the dust collector machine 9. The hold member to 15 may be provided in addition to prevent a shifting of the framework 20. The pickup member to 14 is formed as a hook to hook the framework 20 onto the dust collector machine 9. As shown, the pickup member 214 may be simply formed by a U-shaped steel profile. The U- shaped steel profile extends horizontally in which the U-legs are directed downwardly which allows an easy and robust pickup and release of the framework 22 to the dust collector machine 9.

The framework 20 is configured to carry the pre-separator 10. The framework 20 has a pre- separator holder 210. Here, the pre-separator holder is formed by a bracket 210. The bracket 210 has a left and right bracket arm to enclose the funnel-shaped housing portion 102 of the cyclone housing 100. The outer diameter of the cylindrical housing portion 101 is larger than an inner diameter formed by the left and right bracket arms, such that the cyclone housing 100 is suspendable in the bracket 210 of the framework 20. Advantageously, the bracket 210 forms a robust structure for suspending the pre-separator 10 and beneficially allows a quick mounting and release of the pre-separator 10 to the framework 20.

Thus, the invention provides a dust collector machine or a pre-separator device for pre- separating dust particles from an influent air stream, comprising a cyclone housing for generating a cyclone flow path for an air stream in a cyclone chamber, a shutter for closing off the cyclone housing at a bottom region, a retainer for holding a dust bag below the shutter, further comprising a framework with a framework base for supporting the dust bag, characterised in that a bag carrier for carrying a dust bag is rotatable connected to the framework base, such that a rotation of the bag carrier causes a carried dust bag to twist to close the dust bag.

Although the present invention has been described in detail, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the scope of the invention as hereinafter claimed. It is intended that all such changes and modifications be encompassed within the scope of the present disclosure and claims. Reference list 1 Dust collector system 910 pushbar 911 wheel 9 dust collector machine; industrial vacuum 915 bag carrier cleaner 90 machine framework 92 machine housing 40 900 framework base 920 dust chamber

-16 - 93 suction device 187 bayonet closure member 94 air inlet 95 air outlet 19 dust collector; dust bag 96 filter 97 shutter 98 retainer 20 pre-separator framework 980 gutter portion 200 framework base 99 dust collector; dust bag 201 upstanding framework portion 202 framework grip

10 pre-separator; cyclone pre-separator 205 bag carrier 206 bearing 100 cyclone housing 101 cylindrical housing portion; 210 holder; bracket 102 funnel-shaped housing portion 211L left bracket arm 211R right bracket arm 104 inlet 105 outlet 214 pickup member 215 hold member 17 shutter 171 shutter housing 220 wheel 172 shutter member 221 caster 173 shutter grip 177 bayonet closure member 30 pre-separator device 178 cam 179 O-ring FS floor surface F front 18 retainer B back 180 gutter portion S-S axial axis

Claims (10)

-17 - CONCLUSIONS A dust collection system (1) for extracting dust particles from a floor surface (FS), comprising: a dust collection machine (9) for generating an air flow and filtering dust particles from the air flow, comprising: a machine housing (92) for housing of components, the machine housing (92) having an air inlet (94) and an air outlet (95); a suction device (93) housed in the machine housing (92) for generating the air flow flowing from the air inlet (94) to the air outlet (95); a filter (98) placed between the air inlet (94) and the air outlet (95) for filtering dust particles from the air stream; and / or a pre-separator (10) for pre-separating dust particles from an incoming air stream, which pre-separator (10) is connectable to the air inlet (94) of the dust collection machine (9), comprising: a cyclone housing (100) for generating a cyclone flow path for an air flow in a cyclone chamber, the cyclone housing (100) having an inlet (104) for entering the air flow into the cyclone chamber and an outlet (105) for exiting the air flow from the cyclone chamber ; a shutter (17) for closing the cyclone housing (100) in a lower region with a shutter housing (171) connected to the lower end of the cyclone housing (100) for receiving a shutter member (172) usable to close the bearing close or open located area of the cyclone housing (100); a pre-separator holding member (18) for holding a dust collector (19), the pre-separator holding member (18) being positioned below the shutter (17); wherein at least one of the dust collecting machine (8) and the pre-separator (10) comprises a frame (90, 20) having a frame base (900, 200) for supporting a dust collector (99, 19) which frame base is positioned under a holder (98, 18) for holding a dust collector (99, 19), characterized in that a bag carrier (915, 205) for carrying a dust bag is rotatably connected to the frame base ( 900, 200), such that rotation of the bag carrier (915, 205) causes a supported dust bag (99, 19) to twist to close the dust bag. The dust collection system (1) of claim 1, wherein the bag carrier (915, 205) is freely rotatable with respect to the frame base (900, 200). -18- A dust collection system (1) according to claim 1 or 2, wherein the bag carrier (915, 205) comprises a plate-shaped bag carrier body for supporting the dust bag. The dust collection system (1) of any of claims 1-3, wherein the bag carrier (915, 205) includes a bag carrier handle for manually rotating the bag carrier (915, 205). The dust collection system (1) of claim 4, wherein the bag carrier (915, 205) comprises a transmission between the handle of the bag carrier and a bag carrier body for transmitting a movement of the operator to a rotation of the bag carrier body. Dust collection system (1) according to any of the preceding claims, wherein the dust collection system (99, 19) is an endless bag system for providing a plurality of dust bags, each of which is moldable on board the dust collection system. Dust collection system (1) according to any one of the preceding claims, wherein the dust collection machine (9) and the pre-separator (10) each comprise a container (98, 18), which containers have the same configuration for holding the same dust collector (99). , 19}, in particular for holding the same endless bag system. A pre-separator device (30) for pre-separating dust particles from an incoming air stream, which pre-separator device (30) is connectable to an air inlet (94) of a dust collecting machine (9) comprising: a cyclone housing (100) for generating of a cyclone flow path for an air flow in a cyclone chamber, the cyclone housing (100) having an inlet (104) for entering the air flow into the cyclone chamber and an outlet (105) for exiting the air flow from the cyclone chamber; a shutter (17) for closing the cyclone housing (100) in a lower region with a shutter housing (171) connected to the lower end of the cyclone housing (100) to receive a shutter member (172) that can be used to close or open lower area of the cyclone housing (100); a pre-separator holding member (18) for holding a dust collector (19), the pre-separator holding member (18) being positioned below the shutter (17); wherein the pre-separator (10) comprises a frame (20) having a frame base (200) for supporting a dust collector (19), the frame being positioned base below a container (18) for holding a dust collector (19), characterized in that a Bag carrier (205) for carrying a dust bag is rotatably connected to the frame base (200) such that a rotation of the bag carrier (205) causes a supporting dust bag (19) to twist to close the dust bag. A dust collection machine (9) for vacuuming dust particles from a floor surface (FS), comprising: a machine housing (92) for housing components, the machine housing (92) having an air inlet (94) and an air outlet (95); a suction device (93) housed in the machine housing (92) for generating the air flow flowing from the air inlet (94) to the air outlet (95); a filter (98) placed between the air inlet (94) and the air outlet (95) for filtering dust particles from the air stream; wherein the dust collecting machine (9) comprises a frame (90) having a frame base (900) for supporting a dust collector (99), the frame being positioned base under a container (98) for holding the dust collector (99) ); characterized in that a bag carrier (915) for carrying a bag is rotatably connected to the frame base (900) such that a rotation of the bag carrier (915) causes a supported dust bag (99) to twist around the bag to close. A method of removing a filled dust bag from a dust collection system (1) according to any of claims 1 to 7, the method comprising the step of rotating a rotatable bag carrier (915, 205) to close a filled dust bag.