DE202010011112U1 - Workbench for machining workpieces with a filter unit for detached particles - Google Patents

Abstract

Work table (1) for processing workpieces with a filter unit (33) for detached particles, the filter unit (33) being in a processing unit (2) and being connected to a fan unit (3), characterized in that the processing unit ( 2) - a processing table top (4) on a frame (5) and - which has the processing table top (4) and the frame (5) assigned filter unit (33), to which - attached to the edge of the table (45), from the processing table top (4) slanted perforated sheet metal grids (8), which are provided with detection openings (10) and are connected to the fan unit (3) in a suction-related manner, - at least two filter cartridges (12, 13) attached under the processing table top (4) to filter them Guide surfaces (25) of suction channels (11) from the bevelled perforated grille (8) and provide them with a Venturi nozzle (17, 18) at the cartridge inlet openings (35) n are, and - at least one manually operated container (19, 20) located under the filter cartridges (12, 13) for ...

Description

The invention relates to a workbench for processing workpieces with a filter unit for detached particles, wherein the filter unit is located in a processing unit and is in communication with a fan unit.

An extraction system with dust collecting systems for workbenches for machining workpieces made of stone is described in the product presentation of 05.08.08 on the Internet address http://www.ghines.com, which is equipped with a fan unit and a dust deposit by means of at least one cyclone for coarsely detached particles and brought about by a filter for fine detached particles.

The filters are automatically cleaned by strong compressed air jets, which are triggered only after each shutdown of the suction unit. In addition, additional cleaning cycles can be triggered.

One problem is that the overall cleaning process requires a great deal of time and additional waiting times during the machining process. Furthermore, during filtering, as in 10 is shown, the suction dV / dt (also referred to as volume flow) and the suction pressure difference .DELTA.p with the suction t, so that after a longer suction time t no complete extraction of the detached particles can be done by the weakening suction air flow. This also reduces the efficiency η.

On the other hand, however, can enter the respiratory and the lungs of the operator / the operator by the inhalation of not only mineral dusts diseases, a reduction of the extraction power dV / dt with increasing suction time t of workpiece machining is unreasonable.

The invention is therefore an object of the invention to provide a workbench for machining workpieces with a filter unit for detached particles, which is designed such that the suction or the pressure difference for discharging the detached particles from the processing zone of the worktable in the filter unit at a high quasi-stationary levels are maintained, so that a consistently consistent efficiency can be achieved.

The object is solved by the features of the protection claim 1.

• – eine Bearbeitungstischplatte auf einem Gestell sowie
• – die der Bearbeitungstischplatte und dem Gestell zugeordnete Filtereinheit aufweist, zu der
• – umlaufend an den Plattenkanten angebrachte, von der Bearbeitungstischplatte weg abgeschrägte Lochblechgitter, die mit Erfassungsöffnungen versehen sind und mit der Ventilatoreinheit absaugbezogen in Verbindung stehen,
• – mindestens zwei unter der Bearbeitungstischplatte angebrachte Filterpatronen, zu deren filternden Oberflächen Absaugkanäle von den abgeschrägten Lochblechgittern führen und die an den Patroneneingangsöffnungen mit einer Venturidüse versehen sind, und
• – mindestens ein unter den Filterpatronen befindlicher, manuell bedienbarer Behälter zur Aufnahme der abgelösten Teilchen und zur finalen Abreinigung gehören, und

die Ventilatoreinheit, die an der Filtereinheit modulartig und lösbar abgedichtet angeschlossen ist,

• – einen im Innern befindlichen Ventilator, der mit den Venturidüsen zum Anschluss an die beiden mit Filtermaterial versehenen Filterpatronen in absaugbezogener Verbindung steht,
• – einen Druckkessel mit zumindest zwei den zwei Venturidüsen zentrisch zugeordneten, ventilgesteuerten Druckluftimpulsdüsen, die bei Umschaltung auf wechselseitige Reinigung des Filtermaterials während der laufenden Bearbeitung durch einen Druckluftimpuls die im Filtermaterial enthaltenen Teilchen lösen, die den patronenzugeordneten Behältern zugeführt werden,

besitzt.In the work table for processing workpieces with a detached particle filter unit, the filter unit is located in a processing unit which is connected to a fan unit,
wherein according to the characterizing part of the protection claim 1
the processing unit

• - A processing table top on a rack as well
• - Has the processing table top and the frame associated filter unit, to the
• - Perforated attached to the plate edges, away from the processing table plate away perforated sheet metal grille, which are provided with detection openings and are connected to the fan unit suction related,
• - At least two mounted under the processing table plate filter cartridges, leading to the filtering surfaces suction channels of the chamfered perforated metal sheets and which are provided at the cartridge inlet openings with a venturi, and
• - At least one located under the filter cartridges, manually operable container for receiving the detached particles and for final cleaning include, and

the fan unit, which is connected to the filter unit in a modular and detachably sealed manner,

• - an internal fan which is suction-connected to the venturi nozzles for connection to the two filter cartridges provided with filter material,
• A pressure vessel having at least two valve-controlled compressed-air pulse nozzles centrally associated with the two venturi nozzles, which, when switched over to alternate cleaning of the filter material during operation, are released by a compressed-air pulse to dissolve the particles contained in the filter material which are supplied to the cartridges-associated containers;

has.

The processing table top can be designed in several parts.

The compressed air tank of the fan unit is connected to an external compressed air supply network of the user.

The valves of the compressed air pulse nozzles may be diaphragm valves which are opened for a period in the millisecond range and allow the compressed air pulse. The compressed air pulse or impulse occurs centric to the Venturi nozzle, whereby compressed air is shot into the cartridges and at the same time the air present in the area of the Venturi nozzle is entrained into the filter cartridge.

At the front perforated sheet metal grille, the detection openings are usually open.

At the rear plate edge and the lateral plate edges of the processing table top, the perforated plate grids can have closable detection openings.

In the area of the rear side of the processing table top, there is provided a suction wall for detecting detached high-kinetic particles, which is connected to the internal suction channels of the filter unit. The suction wall can be arranged retractable in the workbench.

The multi-piece worktable plate can be divided into three longitudinally, wherein the front plate member is firmly locked and serve the middle plate member and the rear-facing plate member for opening an area from which a retractable integrated Absaugwand from lying below the processing table plate area in one above the Machining table top is upright position.

The suction wall is provided with detection openings directed to the processing table top, communicating with the fan unit with respect to the suction flow, and detecting the high kinetic particles detached during the current processing of the workpiece.

The processing unit and the fan unit are provided with a protective cover.

For the detachable connection of the modular fan unit to an end wall of the processing unit, at least one sealing element may be provided for the sealing support.

In the fan unit, the suction flow and the pressure-vessel associated user-related external compressed air supply are fluidically separated from each other.

After the connection of the external compressed air supply to the pressure vessel, there is a flow impulse cleaning for the filter unit which, in contrast to the prior art, can be carried out during the current processing operation.

The movable on castors, modular fan unit includes the fan together with the electric motor and the pressure vessel with an input side compressed air connection pipe and output side risers with the filter cartridges associated, valve-controlled Druckluftimpulsdüsen, the valves are in signal communication with a control unit and an associated control bar. The number of compressed air impulse nozzles depends on the number of filter cartridges. The compressed air impulse nozzles can represent nozzle-like injection bores in the riser.

The control unit is connected to a pressure difference sensor from the filter unit in signaling connection, wherein the sensor signals trigger an impulsive compressed air pulses with Luftsogartiger impingement flow in the direction of the respective filter material of the filter cartridges at an achieved particle contamination level of the filter material in the filter cartridges. The pressure difference sensor measures the pressure in front of the filter material and the pressure downstream of the filter material and sends a corresponding signal to the control unit.

The filter unit includes at least one particle collection container located below the filter cartridges.

In the container, a bag for receiving the detached particles may be inserted, which may optionally be provided with a magnetic strip for mounting on the pot-like bottom of the container and thus allows a dust-free emptying of the container. The bag can be a plastic bag.

The container can be removed in a mounted under the filter cartridges on the frame including the associated housing holder, which is provided with a sealing connection between the container and the frame housing. It can also be provided several containers that z. B. serve for the detection of coarse detached particles and also of fine detached particles.

On the containers clamping closures can be provided with which the containers are peripherally supported sealed to the support of the frame housing.

There is also a control panel, which includes at least a main switch, a blower switch and a pressure switch for manual triggering of the cleaning, wherein the control bar can be attached to the fan unit.

At the front of the worktable a height-adjustable ledge holder can be mounted with a cross-sectionally U-shaped workpiece holder and a locking device, wherein the locking device is designed as a latching hitch, without additional locking elements must be used.

The automatic differential pressure controlled cleaning of the filter cartridges is always in operation during the machining process and is available in the Compared to the offline methods of the prior art, an on-line method.

During manual cleaning, the filter cartridges are alternately cleaned in a given cycle.

According to the invention, quasi-stationary levels are attained for the suction power dV / dt and the suction pressure difference Δp as a function of the suction time t.

Preferably, an integrated sensor is provided in the fan unit, which permanently monitors the degree of contamination of the filter cartridges and automatically triggers the Abreinigungszyklus as soon as the suction of the filter unit reaches a set on the sensor, predetermined pulse-triggering limit. Part of this integrated sensor system is at least one cartridge-associated pressure difference sensor in the filter unit.

The invention will be explained in more detail with reference to an exemplary embodiment by means of several drawings:
Show it:

1 a perspective view of a workbench according to the invention for machining workpieces with a filter unit for detached particles with integrated, below the processing table plate retractable exhaust wall,

2 a perspective view of a work table according to the invention for machining workpieces with a filter unit for detached particles with integrated, drawn from the processing table plate exhaust wall,

3 a longitudinal section along the lines AA of the worktable after 2 including a filter cartridge of two provided filter cartridges in the filter unit,

4 a front view of the workbench,

5 a plan view of the split worktable plate of the worktable with frontal perforated sheet metal grilles and front Simshalterung,

6 a side view of the workbench,

7 a cross section through the work table with filter unit along the lines BB to 2 and

8th a rear view of the fan unit of the workbench,

9 a connection of two filter cartridges to a ventilator unit facing end wall of the processing unit with Venturi nozzles and compressed air pulse nozzles, wherein

9a the arrangement of the cartridges between the filter unit and the fan unit,

9b the pressure vessel with the two output risers in rear view,

9c the pressure vessel with the two risers in side view and

9d a detail enlargement of the risers with therein nozzle-like injection holes with respect to the detail C according to 9c
demonstrate,

10 Characteristics of the suction power dV / dt and the suction pressure difference Δp and the efficiency η as a function of the suction time t in a workbench according to the prior art and

11 Characteristics of the suction power dV / dt and the suction pressure difference Δp and of the efficiency η as a function of the suction time t in the workbench according to the invention.

The following are the 1 . 2 . 3 and 9a considered together.

In the 1 . 2 is a as a workbench 1 trained grinding table for processing stone workpieces with a filter unit 33 for particles loosened during grinding, forming mineral dusts in perspective, wherein the filter unit 33 yourself in a processing unit 2 located and with a fan unit 3 communicates.

• – eine Bearbeitungstischplatte 4 auf einem Gestell 5 sowie
• – die am Gestell 5 befestigte Filtereinheit 33 auf, zu der
• – umlaufend an den Plattenkanten 45 angebrachte, von der Bearbeitungstischplatte 4 weg abgeschrägte Lochblechgitter 8, die mit Erfassungsöffnungen 10 versehen sind und mit der Ventilatoreinheit 3 absaugbezogen in Verbindung stehen,
• – zwei unter der Bearbeitungstischplatte 4 angebrachte Filterpatronen 12, 13, zu deren filternden Oberflächen 25 Absaugkanäle 11 von einer Absaugwand 6 und von den abgeschrägten Lochblechgittern 8 führen und die an dem Patroneneingang 35 mit einer Venturidüse 17,18 versehen sind, und
• – zwei unter den Filterpatronen 12, 13 befindliche, manuell bedienbare Behälter 19, 20 zur Aufnahme der abgelösten und abgesaugten Teilchen und zur finalen Abreinigung, gehören, und

wobei die Ventilatoreinheit 3, die an der Filtereinheit 33 modulartig und lösbar abgedichtet angeschlossen ist,

• – einen im Innern befindlichen Ventilator 15, der mit den Venturidüsen 17, 18 zum Anschluss an die beiden mit Filtermaterial 121, 131 umgebenen Filterpatronen 12, 13 in absaugbezogener Verbindung steht,
• – einen Druckkessel 16 mit zwei den Venturidüsen 17, 18 zentrisch zugeordneten, ventilgesteuerten Druckluftimpulsdüsen 41, 42, die während der laufenden Bearbeitung bei Umschaltung auf wechselseitige Reinigung des Filtermaterials 121, 131 durch einen eingestellten Druckluftimpuls aus dem Druckkessel 16 die im Filtermaterial 121, 131 enthaltenen Teilchen lösen, die den patronenzugeordneten Behältern 19, 20 zugeführt werden,

besitzt.According to the invention, the processing unit 2

• - A processing table top 4 on a rack 5 such as
• - the on the frame 5 attached filter unit 33 on, to the
• - circumferential at the edges of the plate 45 attached, from the editing table top 4 away beveled perforated sheet grid 8th with entry ports 10 are provided and with the fan unit 3 suction-related,
• - two under the processing table top 4 attached filter cartridges 12 . 13 , to their filtering surfaces 25 suction 11 from a suction wall 6 and the beveled perforated sheet metal grilles 8th lead and the at the cartridge entrance 35 with a Venturi nozzle 17 . 18 are provided, and
• - two under the filter cartridges 12 . 13 located manually operated containers 19 . 20 for picking up the detached and sucked particles and for final cleaning, and,

the fan unit 3 attached to the filter unit 33 modular and detachably sealed connected,

• - an inside fan 15 that with the venturi nozzles 17 . 18 for connection to the two with filter material 121 . 131 surrounded filter cartridges 12 . 13 is in a suction-related connection,
• - a pressure vessel 16 with two of the venturi nozzles 17 . 18 Centrically assigned, valve-controlled compressed air pulse nozzles 41 . 42 , during the processing when switching to mutual cleaning of the filter material 121 . 131 by a set compressed air pulse from the pressure vessel 16 in the filter material 121 . 131 solve the particles contained in the cartridges 19 . 20 be fed

has.

The processing table top 4 can be designed in several parts. The frame 5 has legs with height-adjustable feet 37 and one to the filter unit 33 belonging, sealed housing.

The pressure vessel 16 the fan unit 3 is via a compressed air connection pipe 31 connected to an external compressed air supply network.

The fan 15 sucked air from the filter unit 33 is about one in the fan unit 3 included air outlet gate 65 delivered outside.

In 2 is a perspective view of the worktable 1 with integrated, unfolded box-shaped suction wall 6 with detection openings 7 shown by one under the processing table top 4 original recessed position in an approximately upright position on the processing table top 4 brought is.

The exhaust wall 6 but can also be an independent box with detection openings 7 its on the processing table top 4 is erectable and via one of the suction channels 11 with the filter unit 33 connected or connectable, as in 3 is shown.

In the 2 shown at the edge located, from the processing table top 4 out sliding suction wall 6 is with the wall-side detection openings 7 to the editing table top 4 and processing zone 47 directed, with the exhaust wall 6 suction flow related with the fan unit 3 communicates.

For connecting the fan unit 3 on the front wall 14 the processing unit 2 is at least one sealing element 9 provided for sealing support.

The processing unit 2 and the fan unit 3 can be provided with a protective cover (not shown).

In 3 is a cut along the lines AA of the worktable 1 to 2 including a cut filter cartridge 12 of two filter cartridges 12 . 13 in the filter unit 33 shown.

The on castors 28 movable, modular fan unit 3 contains the fan 15 together with electric motor 30 as well as the pressure vessel 16 with a compressed air connection pipe 31 for external compressed air supply.

Through the control unit 32 becomes due to pressure difference sensor signals from the filter unit 33 that at a achieved particle contamination level of the filter material 121 . 131 or level, impulsive compressed air pulses 56 in the respective filter cartridges 12 . 13 triggered in directed. The degree of contamination is detected by means of a pressure difference sensor (not shown), the pressure in front of the filter material 121 . 131 and the pressure after the filter material 121 . 131 is measured. The negative pressure representing, resulting pressure difference limit 44 with Δp _G is the trigger of the opening signals to the valves 58 . 59 the compressed air pulse nozzles 41 . 42 , The cleaning process can take place automatically during the current machining process.

Depending on requirements, but also by means of a connected pressure switch 53 manually compressed air pulses (jet impulses) for cleaning the filter material 121 . 131 the filter cartridges 12 . 13 to be triggered.

The filter material 121 . 131 Adherent particles are strengthened by the air-intensified powerful compressed air pulse from their binding with the filter material 121 . 131 solved and then fall by gravity into the underlying container 19 . 20 , Essentially serve the container 20 for receiving coarse particles and the container 19 for the absorption of fine particles.

In the fan unit 3 is the fan 15 for generating the suction flow via the Venturi nozzles 17 . 18 as well as the filter cartridges 12 . 13 through the suction channels 11 provided through. The suction flow and the user-related external compressed air supply separated from each other, wherein at the beginning of the cleaning process, the pressure vessel 16 is emptied. In the pressure vessel 16 After connecting to the external compressed air supply, the air is compressed to a specified pressure value. At the pressure vessel 16 a pressure gauge for pressure level measurement and display is installed.

After connecting compressed air by means of the compressed air supply thus has the grinding table 1 the possibility of a flow impulse cleaning.

In 4 is a front view of the workbench 1 shown, with the lines BB off 4 as a cross section for 7 through the workbench 1 is specified.

The filter unit 33 belonging particle collection container 19 . 20 are located below the filter cartridges 12 . 13 , Into the containers 19 . 20 are plastic bags (not shown) for receiving the detached particles inserted, the plastic bags with a magnetic strip for mounting on the pot-like bottom of the container 19 . 20 can be provided. The retaining magnetic strips prevent the plastic bag from the suction air flow of the fan 15 is sucked off.

The containers 19 . 20 are each in one under the filter unit 33 attached bracket 29 insertable, with a sealed connection between the container 19 . 20 and the frame housing is provided. By fasteners 38 . 39 on the containers 19 . 20 can the containers 19 . 20 be circumferentially mounted on the frame housing sealed.

The emptying of the two particle collection containers 19 . 20 takes place in that the two tension locks 38 . 39 the brackets 29 be solved and the respective container 19 . 20 manually at his handle 43 from the holder 29 is pulled out. Is the particle collection container 19 . 20 filled, the plastic bag is detached from the container edge and closed.

The coupling of the fan unit 3 to the filter unit 33 done by docking the fan unit 3 to the connection point of the filter unit 33 , one on the filter unit 33 as a connection means attached sealing element 9 to a uniform seal between the two units 3 . 33 leads. The filter unit 33 has height-adjustable feet 37 on, allowing an adjustment of the processing unit 2 to the fan unit 3 can be carried out. By means of clamping locks 50 front and back of the fan unit 3 and corresponding counter-elements on the frame 5 or at the processing unit 2 can be a sealed connection between the two units 3 . 33 be achieved.

To the workbench 1 also includes the control bar 40 as in the 3 . 4 shown with both the operation of the workbench 1 as well as the cleaning can be controlled and preferably laterally on the fan unit 3 is appropriate.

At the control bar 40 there is preferably a main switch 51 , a blower switch 52 and a pressure switch 53 the latter being actuated by manual cleaning, in particular with small particle detachment.

In 5 is a plan view of the processing table top 4 of the workbench 1 shown.

The processing table top 4 is preferably divided along three, with the front 21 directed plate part 22 can be firmly locked and the middle plate part 23 as well as the back side 46 directed plate part 24 for opening an area for extending the sunk suction wall 6 from under the processing table top 4 serve lying area. The middle plate part 23 and the rear plate part 24 can be tilted to the opening of the processing table top 4 be educated.

Running around the processing table top 4 are at the plate edges 45 Perforated grille 8th with their frontal detection openings 10 beveled attached, with at least three of them at the plate edges 45 are closable. Is the integrated suction wall 6 from their position below the processing table top 4 pulled out, supports the rear plate part 24 by its tilted tilt the upright position of the upright suction wall 6 , The exhaust wall 6 is at the same time in the filter unit 33 internal suction ducts 11 connected.

The machining of a workpiece by means of the worktable 1 is explained below 5 explained.

Essential for the machining of workpieces z. B. stone are the edge grinding and surface grinding.

For the edge grinding of a workpiece are in each case the frontal open detection openings 10 the main suction openings for the resulting abrasive particles. Because in the grinding zone 47 , in 5 framed as a circle, the greatest extraction power dV / dt is required, which can be further from the grinding zone 47 substantially remote detection openings 10 the perforated metal grid 8th be closed while the front Perforated grille 8th constantly open detection openings 10 having.

The edge sharpening can also be with the at the front 21 of the workbench 1 attached and height-adjustable ledge holder 26 be carried out, wherein the workpiece on a locking device 48 by means of locking bolts 60 be held and with a ratchet hanger 64 from altitude position to altitude position.

For the surface grinding of the workpiece, in particular the integrated suction wall 6 be used. These are the middle plate part 23 and the rear plate part 24 tipped and the exhaust wall 6 is by means of a tether 27 in one above the processing table top 4 projecting upright position. Finally, the middle plate part 23 folded back to its original horizontal position. The rear plate part 24 supports with a tilted arrestable stop 63 the exhaust wall 6 in their upright position.

While grinding the on the plate parts 23 . 24 lying workpiece are the detection openings 7 . 10 in the processing zone 47 open and far out of the processing zone 47 existing detection openings 10 closed. By aligning the grinding tool in the direction of the suction wall 6 can be prevented that detached particles with high kinetic energy, the suction of the suction wall 6 overcome and thereby not be captured.

In 6 is a side view of the workbench 1 with brought in the vertical position suction wall 6 shown. The ledge for edge grinding 26 is with a workpiece holder 49 and a locking device 48 provided for holding the workpiece. The locking device can as Rastereinhängung 64 be formed without additional locking elements must be used. The workpiece holder 49 can be U-shaped in cross section.

In 7 is a cross section through the workbench 1 with filter unit 33 along the lines BB 4 shown.

The with height-adjustable feet 37 equipped filter unit 33 consists of the two filter cartridges 12 . 13 , which are mounted on the clean air side. The filter material 121 . 131 can be polyester.

The in the associated dust containers 19 . 20 contained bags (not shown) are preferably polyester bags for dust-free disposal.

In 8th is a rear view of the fan unit 3 of the workbench 1 shown, with a removable orifice plate 161 for the formation of the connection of the fan unit 3 and the filter unit 33 is provided.

In 9a is the connection of the two via the suction channels 11 the particle-air mixture filtering cartridges 12 . 13 to the fan unit 3 directed end wall 14 the processing unit 2 shown.

The main elements of the filter unit 33 are essentially the two filter cartridges 12 . 13 on which to the fan unit 3 each directed a venturi 17 . 18 with a seal 34 are applied. The cartridges 12 . 13 are at an opening in the fan unit 3 directed frontal wall 14 attached and on the entrance openings 35 the two cartridges 12 . 13 are the two Venturi nozzles 17 . 18 attached, as in the perspective view in 9a is shown.

In 9a are two to the pressure vessel 16 connected valve-controlled compressed air pulse nozzles 41 . 42 on two leading from the pressure vessel, vertically oriented risers 54 . 55 provided, the valves 58 . 59 with a control unit 32 and an associated control bar 40 in signal communication.

The valves 58 . 59 the centric to the Venturi nozzles 17 . 18 directed compressed air pulse nozzles 41 . 42 may be diaphragm valves that are opened for about 0.1 s and the compressed air pulse 56 enable. The compressed air pulse or shock 56 takes place via the respective compressed air inlet area 61 . 62 over the injection holes 41 . 42 centric to the Venturi nozzle 17 . 18 , where compressed air through the Venturi nozzles 17 . 18 in the cartridges 12 . 13 explosively flows and at the same time in the area of the Venturi nozzle 17 . 18 existing air into the filter cartridge 12 . 13 , the cleaning of the filter material 121 . 131 supportive, tearing down. The reinforced compressed air collides with the cartridge material on the filter material 121 . 131 and dissolves the particles from the filter material 121 . 131 ,

The filter unit 33 but also with more than two filter cartridges 12 . 13 be equipped, with more than two valve-controlled compressed air pulse nozzles 41 . 42 for the generation of compressed air pulses 56 for cleaning the filter material 121 . 131 can be provided. In essence, by increasing the number of these elements, the elongations of the pressure differences Δp become the quasi-stationary pressure difference level 36 reduced.

In the 9b . 9c are single elements or in 9d an enlargement of the riser 54 . 55 with a compressed air pulse nozzle 41 . 42 in the form of nozzle-like injection bores 9c shown.

By means of the mounting plates 57 at the ends of the riser pipes 54 . 55 can the pressure vessel 16 in the fan unit 3 be attached.

In 11 are characteristics of the suction power dV / dt and the suction pressure difference Δp as a function of the suction time t in the workbench according to the invention 1 shown.

In each case a characteristic are the suction power dV / dt and the suction pressure difference Δp as a function of the suction time t for two cartridges 12 . 13 given in both dependencies a quasi-stationary level 36 In contrast to the prior art, the cleaning can not be carried out in necessary interruption times or breaks, but during the ongoing grinding process.

In the processing zone 47 is an automatic pressure difference controlled cleaning of the filter cartridges 12 . 13 to achieve a quasi-stationary pressure difference level 36 intended.

During manual cleaning, the filter cartridges 12 . 13 alternately cleaned in a given cycle.

Even with the manual alternating cleaning becomes the quasi-stationary suction pressure difference level 36 reached.

An integrated sensor in conjunction with at least one pressure difference sensor in the filter unit 33 permanently monitors the degree of saturation of the filter cartridges 12 . 13 and automatically triggers the cleaning cycle as soon as the pressure difference Δp of the filter unit 33 a set on the sensor, predetermined pressure difference limit 44 reached with Δp _G.

LIST OF REFERENCE NUMBERS

1

worktable

2

processing unit

3

fan unit

4

Editing table

5

frame

6

extraction facility

7

sensing ports

8th

Perforated grille

9

sealing element

10

circumferential detection openings

11

suction

12

first filter cartridge

121

first filter material

13

second filter cartridge

131

second filter material

14

bulkhead

15

fan

16

pressure vessel

161

orifice plate

17

first venturi

18

second venturi

19

first container

20

second container

21

front

22

first plate part

23

second plate part

24

third plate part

25

filtering surface

26

Sims bracket

27

tether

28

castors

29

bracket

30

electric motor

31

Compressed air supply pipe

32

control unit

33

filter unit

34

sealing element

35

entrance opening

36

quasi-stationary level

37

height adjustable feet

38

Lever Release

39

Lever Release

40

control bar

41

Druckluftimpulsdüse

42

Druckluftimpulsdüse

43

Handle

44

Differential pressure limit

45

panel edges

46

back

47

processing zone

48

locking device

49

Workpiece holding mechanism

50

Lever Release

51

main switch

52

fan switch

53

pressure switch

54

first riser

55

second riser

56

Compressed air pulse

57

mounting plate

58

first valve

59

second valve

60

locking pin

61

first compressed air inlet area

62

second compressed air inlet area

63

attack

64

Rastereinhängung

65

Luftabströmgatter

dV / dt

suction

Ap

Differential pressure / underpressure

Δp _G

Differential pressure limit

η

efficiency

t

Time

Claims (25)

Workbench ( 1 ) for machining workpieces with a filter unit ( 33 ) for detached particles, wherein the filter unit ( 33 ) in a processing unit ( 2 ) and with a fan unit ( 3 ), characterized in that the processing unit ( 2 ) - a processing table top ( 4 ) on a rack ( 5 ) as well as - those of the processing table top ( 4 ) and the frame ( 5 ) associated filter unit ( 33 ), to which - circumferentially at the plate edges ( 45 ), from the processing table top ( 4 ) away beveled perforated sheet metal grilles ( 8th ), which are equipped with detection openings ( 10 ) and with the fan unit ( 3 suction-related, - at least two under the processing table top ( 4 ) attached filter cartridges ( 12 . 13 ), to their filtering surfaces ( 25 ) Suction channels ( 11 ) from the beveled perforated sheet metal grids ( 8th ) and the at the cartridge inlet openings ( 35 ) with a Venturi nozzle ( 17 . 18 ), and - at least one of the filter cartridges ( 12 . 13 ), manually operable container ( 19 . 20 ) for receiving the detached particles and for the final cleaning, and that the fan unit ( 3 ) attached to the filter unit ( 33 ) is connected in a modular and detachably sealed manner, - an internal fan ( 15 ), which with the Venturi nozzles ( 17 . 18 ) for connection to the two with filter material ( 121 . 131 ) provided filter cartridges ( 12 . 13 ) is in suction-related connection, - a pressure vessel ( 16 ) with at least two of the venturi nozzles ( 17 . 18 ) centrally assigned, valve-controlled compressed air pulse nozzles ( 41 . 42 ), which during operation when switching to mutual cleaning of the filter material ( 121 . 131 ) by an impulsive compressed air pulse ( 56 ) in the filter material ( 121 . 131 ) contained in the cartridge ( 19 . 20 ), has. Workbench according to claim 1, characterized in that the processing table top ( 4 ) is formed in several parts. Workbench according to claim 1 or 2, characterized in that on the perforated sheet metal grids ( 8th ) the associated front-side detection openings ( 10 ) open and the lateral and rear detection openings ( 10 ) are optionally closable. Workbench according to claim 1, characterized in that in the region of the rear side ( 46 ) of the processing table top ( 4 ) mounted perforated sheet grid ( 8th ) an upright suction wall ( 6 ) with detection openings ( 7 ) provided to the internal suction channels ( 11 ) of the filter unit ( 33 ) and used to detect detached high-kinetic particles. Workbench according to claim 2, characterized in that the processing table top ( 4 ) is divided longitudinally in three, with the front ( 21 ) directed plate part ( 22 ) is firmly locked and the middle plate part ( 23 ) as well as the back ( 46 ) directed plate part ( 24 ) for opening an area from which a retractable integrated suction wall ( 6 ) from under the processing table top ( 4 ) in one above the processing table plate ( 4 ) upright position is displaceable. Workbench according to claim 4 or 5, characterized in that the integrated suction wall ( 6 ) with detection openings ( 7 ) leading to the processing table top ( 4 ), is provided for detecting detached high-kinetic particles and suction flow-related with the fan unit ( 3 ). Workbench according to claim 1, characterized in that the processing unit ( 2 ) and the fan unit ( 3 ) are provided with a protective cover. Workbench according to claim 1, characterized in that for the detachable connection of the modular fan unit ( 3 ) on the front wall ( 14 ) of the processing unit ( 2 ) at least one sealing element ( 9 ) is provided for sealing support. Workbench according to claim 1, characterized in that in the fan unit ( 3 ) the suction flow and the pressure vessel ( 16 ), external compressed air supply are fluidically separated from each other. Workbench according to claim 9, characterized in that after the connection of the external compressed air supply to the pressure vessel ( 16 ) for the filter unit ( 33 ) there is a flow impulse cleaning, which is feasible during the current processing operation. Workbench according to claim 10, characterized in that the on castors ( 28 ) movable, modular fan unit ( 3 ) the fan ( 15 ) and electric motor ( 30 ) as well as the pressure vessel ( 16 ) with an external compressed air supply connectable input side Compressed air connection pipe ( 31 ) and on the output side with at least two risers ( 54 . 55 ), at least one of the respective filter cartridge ( 12 . 13 ), valve-controlled compressed air pulse nozzles ( 41 . 42 ), the valves ( 58 . 59 ) with a control unit ( 32 ) and an associated control bar ( 40 ) are in signal communication. Workbench according to claim 11, characterized in that the compressed-air pulse nozzles ( 41 . 42 ) are designed as nozzle-like injection bores. Workbench according to claim 11, characterized in that the valves ( 58 . 59 ) of the compressed air pulse nozzles ( 41 . 42 ) Diaphragm valves are opened for a period in the millisecond range and the compressed air pulse ( 56 ), the compressed air impulse or impulse ( 56 ) Centric to the compressed air pulse nozzle ( 41 . 42 ), with compressed air in the cartridges ( 12 . 13 ) flows explosively and at the same time in the area of the compressed air pulse nozzle ( 41 . 42 ) with existing air into the filter cartridge ( 12 . 13 ). Workbench according to claim 11, characterized in that the control unit ( 32 ) with at least one pressure difference sensor from the filter unit ( 33 ) is in signaling connection, wherein the sensor signals at a reached degree of contamination of the filter material ( 121 . 131 ) in the filter cartridges ( 12 . 13 ) impulsive compressed air pulses with air-like impingement flow in the direction of the respective filter material ( 121 . 131 ) of the filter cartridges ( 12 . 13 ) trigger. Workbench according to claim 14, characterized in that the filter unit ( 33 ) at least one particle collecting container ( 19 . 20 ) located below the filter cartridges ( 12 . 13 ) is located. Workbench according to claim 15, characterized in that in the container ( 19 . 20 ) a bag for receiving the detached particles is inserted. Workbench according to claim 16, characterized in that the bag with a magnetic strip for mounting on the pot-like bottom of the container ( 19 . 20 ) is provided. Workbench according to claim 15, characterized in that the container ( 19 . 20 ) in one of the filter cartridges ( 12 . 13 ) on the housing of the frame ( 5 ) mounted bracket ( 29 ) and removable, which is provided with a sealing connection between the container ( 19 . 20 ) and the housing of the frame ( 5 ) is provided. Workbench according to claim 18, characterized in that on the container ( 19 . 20 ) at least one tension lock ( 38 . 39 ) is provided, with which the container ( 19 . 20 ) circumferentially on the holder ( 29 ) is held sealed. Workbench according to claim 1, characterized in that a control bar ( 40 ) in the area of the fan unit ( 3 ) is present, to which at least one main switch ( 51 ), a blower switch ( 52 ) and a pressure switch ( 53 ) belong. Workbench according to claim 1, characterized in that on the front ( 21 ) of the processing unit ( 2 ) a height-adjustable ledge holder ( 26 ) with a U-shaped workpiece receiving device ( 49 ) and a locking device ( 48 ) is mounted for workpieces to be machined. Workbench according to claim 21, characterized in that the locking device ( 48 ) as a ratchet suspension ( 64 ) is formed without additional locking elements. Workbench according to claims 1 to 22, characterized in that in the processing zone ( 47 ) an automatic pressure difference-controlled cleaning of the filter cartridges ( 12 . 13 ) to achieve a quasi-stationary pressure difference level ( 36 ) is provided during the ongoing processing of the workpiece. Workbench according to claims 1 to 22, characterized in that with a manual cleaning the filter cartridges ( 12 . 13 ) are alternately cleaned in a predetermined cycle, so that a quasi-stationary pressure difference level (D) for the suction pressure difference (Δp) as a function of the suction duration (t) ( 36 ) is achieved. Workbench according to claims 1 to 24, characterized in that an integrated sensor in the fan unit ( 3 ) in conjunction with at least one pressure difference sensor in the filter unit ( 33 ) is provided, wherein the sensor permanently the particle saturation degree of the filter cartridges ( 12 . 13 ) and automatically triggers the cartridge replacement cleaning cycle as soon as the pressure difference (Δp) of the filter unit ( 33 ) set a pulse-triggering pressure difference limit value Δp _G ( 44 ) reached.

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