FR2914575A1 - Autonomous station for cutting e.g. flexible pipe, in workshop, has cutting chamber equipped with air purifier with electrostatic filter through which air charged with smoke and contained in chamber circulates before exiting chamber - Google Patents

Abstract

The station (1) has a cutting chamber (4) in which a piece (2) e.g. flexible pipe, to be cut is introduced, where the chamber houses a cutting tool (8) and a maintenance unit (9) that maintains the piece to be cut against a cutting edge of the tool. The cutting tool and the maintenance unit are relatively moved between a wait position for positioning the piece and a cutting position of the piece. The chamber is equipped with an air purifier (3) with electrostatic filter through which air charged with smoke and contained in the chamber circulates before exiting the chamber.

Description

The invention relates to a self-contained part cutting station comprising at least

  least a material capable of producing a smoke release during the cutting operation of said workpiece.

  Some parts, such as mixed parts metal / synthetic material, are likely to produce, during cutting of the room, a release of fumes. Such is the case of flexible conduits having a metal core and a rubber sheath, the melting of the rubber in contact with metal generating fumes.

  For this reason, the series cutting stations of part made of at least one material capable of producing a release of fumes, during the cutting operation, require the establishment of a device for cleaning these fumes . In general, a cutting station of this type of part is fixed in a cutting workshop and formed of a frame on which is mounted a cutting chamber. This cutting chamber, inside which is introduced the workpiece, houses a cutting tool, such as a circular saw, in the lower part, and a means for holding the workpiece to be cut against the cutting edge. the cutting tool, in the upper part. These two elements, driven by a relative movement between a positioning position of the position to be cut and a cutting position, cooperate to make the cut of said part. Conventionally, an air duct connects the cutting chamber to a centralized device for purifying the air charged with smoke. Thus, all the fumes coming from the stationary workpiece cutting stations are purified, in common, by means of a single purification device.

  However, this type of centralized smoke-fired air cleaning device 30 is not suitable for a stand-alone room-cutting station in so far as it is capable of being moved and placed in an environment free of heat. a centralized purification plant of high cost.

  An object of the present invention is to provide a self-contained part cutting station capable of producing a smoke release, during the cutting operation, the design of which allows a low-cost purification of the air charged with fumes before discharge. in the atmosphere without recourse to a centralized purification plant.

  For this purpose, the subject of the invention is an autonomous part cutting station, such as a flexible duct, comprising at least one material capable of producing a smoke release during the cutting operation, said station comprising at least one cutting chamber in which is introduced the workpiece, said cutting chamber housing at least one cutting tool and means for holding the workpiece to be cut against the cutting edge of the cutting tool, the cutting tool and the means for holding the workpiece being moved relative to each other between a position-waiting position of the part to be cut and a cutting position of said part, characterized in that the cutting chamber is equipped, in addition, at least one electrostatic filter air purifier through which the smoke-laden air contained in the cutting chamber, circulates before output of said cutting chamber.

  Preferably, the compartmentalized cutting chamber defines at least a first chamber for accommodating the cutting tool, and a second chamber for holding means for holding the workpiece, said first and second chambers communicating between they have an opening inside which protrude said cutting tool and / or said holding means at a relative displacement between said cutting tool and said holding means. The electrostatic filter air purifier is housed in an opening on one of the faces, preferably the top face, of said second housing chamber means for holding the workpiece to be cut substantially vertically. said holding means. Preferably, the electrostatic filter air purifier, affecting the general shape of a cassette, has at least a first zone, called ionization zone, in which the particles suspended in the air contained in the cutting chamber is electrically charged, a second so-called collector zone constituting an electric field of attraction of said charged particles, said electric field being of opposite charge to that of said charged particles, and means for channeling the air contained in said cutting chamber through said first and second areas of the electrostatic filter air purifier for rejection of purified air out of the cutting chamber. The ionization zone of the particles in suspension in the air of the cutting chamber is formed by electric wires traversed by an electric current, whereas the collecting zone of the charged particles is composed of metal strips subjected to a field. electric.

  Preferably, the autonomous part cutting station comprises at least one opening in a wall of the cutting chamber for the introduction of the workpiece, said opening also acting as an air inlet in said cutting enclosure.

  Preferably, the autonomous part cutting station is equipped with an outer conduit, one end of which is connectable to said cutting chamber and the other end of which is positionable at or near the free end of the pipe. part to be cut, this external duct sucking the air charged with smoke emerging at the free end of said piece and conveying it towards the cutting chamber.

  Preferably, the relative displacement between the cutting tool and the holding means of the workpiece to be cut against the cutting edge of the cutting tool is controlled from a control, such as a pedal, external to said cutting enclosure.

  Preferably, the cutting chamber is compartmentalized, for the delimitation of the first and second chambers, by a partition forming a cutting table of said workpiece. Preferably, the cutting opening between the first and second chambers 25 is closed by controlled closure means, preferably by a command common to the actuating command in relative displacement of the holding means and the tool. cutting.

  Preferably, the cutting tool is driven by a motor, whose cooling means are arranged in an opening in one of the faces of the cutting chamber housing the cutting tool, to avoid a disturbance of the air contained in said cutting chamber.

  Preferably the autonomous part cutting station is equipped with means for bending the piece to be cut, in order to give said piece a general shape convex with respect to the cutting tool.

  The invention will be better understood, and other objects, details, features and advantages thereof will become more apparent in the following detailed explanatory description of two embodiments of the invention given as examples. purely illustrative and non-limiting, with reference to the accompanying drawings.

On these drawings:

  FIG. 1 represents a block diagram of an autonomous part-cutting station, according to a first embodiment, in accordance with the invention, FIG. 2 represents a perspective view of an autonomous part-cutting station. according to the first embodiment of the invention,

  FIG. 3 represents a perspective view of the autonomous part-cutting station, illustrated in FIG. 2, in which certain elements have been removed to facilitate understanding,

  FIG. 4 represents a sectional front view of the autonomous part-cutting station, illustrated in FIG. 2; FIG. 5 represents a block diagram of an autonomous part-cutting station, according to a second embodiment of FIG. production. As mentioned above, the invention relates to a cutting station 1, for cutting the part 2 capable of producing a smoke release, equipped with an electrostatic filter air purifier to purify these fumes before exit to the atmosphere. The piece 2 to be cut, such as a flexible conduit, is generally stored in the wound state and needs to be unrolled according to the desired length before the cutting operation. The piece 2 to cut has an end 2a, said free. The piece 2 to be cut is generally a bonded piece comprising at least one metallic material and a synthetic material. Such a piece 2 is, for example, made from a braiding, tubular, made from wire. This tubular braiding is coated with a layer of rubber. During the cutting operation of this part 2, the synthesis material, by heating up in contact with the metallic material, produces a smoke release.

  A first embodiment of an autonomous cutting station 1 according to the invention is illustrated in FIGS. 1 to 4.

  In this first embodiment, the workpiece cutting station 1 is formed of a cutting chamber 4 into which the workpiece 2 to be cut is inserted. The chamber 4 for cutting is compartmentalized, in two superimposed chambers, by a partition 16, delimiting a first chamber 4b, said lower, and a second chamber 4a, said upper communicating with each other through an opening 10, said opening 10 cutting . The lower chamber 4b houses the rotary cutting tool 8 of the workpiece 2 to be cut, while the upper chamber 4a houses, on the one hand, the means 9 for holding the workpiece 2 to be cut against the cutting edge of the tool 8 cutting, and secondly, the air purifier 3 with electrostatic filter. The holding means 9 and the cutting tool 8 are thus arranged in the superimposed state and spaced apart from each other. The cutting tool 8 and the means 9 for holding the workpiece 2 are moved relative to each other in the direction of a coming together, or a distance apart, to move from a positionally waiting position the piece 2 to be cut to a close cutting position of said part 2 taken in a vice between the cutting tool 8 and the holding means 9 and vice versa.

  In the example shown in FIG. 3, the means 9 for holding the workpiece 2 to be cut, affect the shape of a square, one arm of which forms the bearing surface of said workpiece 2 against the cutting edge of the workpiece 2. tool 8 rotary cutter. These holding means 9 are actuated by a control 23, such as a pedal, disposed outside the chamber 4 of cutting, and connected to said control 23 by a cable. The control 23 actuates said holding means 9 in the direction of bringing said piece 2 to be cut against the cutting edge of the rotary cutting tool 8, while a spring 24 exerts a force against the bringing said parts together, to maintain the means 9 for holding in the position of positioning position of the part 2 to be cut in the chamber 4 of cutting, that is to say in the up position, in this mode of production.

  The upper chamber 4a is provided with two openings 5, 6, arranged facing one another, each being formed in one of the two parallel side faces of said chamber 4a. The piece 2 to be cut is introduced into the upper chamber 4a through one of the openings 5, 6, until it projects from said chamber 4a through the other opening 6. , the upper chamber 4a from one side through the openings 5, 6 and rests on the partition 16, this partition 16 forming a cutting table 7 of the part 2. Preferably, the opening 5 constitutes the opening 30 intended at the introduction of the piece 2 to cut, while the opening 6 constitutes the opening for the outlet of the part 2. These openings 5, 6 are, in addition, air inlets of the enclosure 4 cutting.

  The cutting table 7 has, on its upper face, means 18 for bending the workpiece 2 to be cut. These bending means 18 are formed of two tubular pieces disposed outside the chamber 4 for cutting on the flow path of the part 2, formed by the openings 5, 6 of inlet and outlet of part 2 of the enclosure 4 cutting. These bending means 18, on which the workpiece 2 to be cut is manually held in abutment, give said workpiece 2 a generally convex shape with respect to the cutting edge of the cutting tool 8. This convexity improves the cutting efficiency of the part 2 by the cutting tool 8. The two chambers 4a, 4b of the chamber 4 of section, compartmentalized by the partition 16, communicate with each other through the opening 10 of cut, formed in said partition 16. The cutting tool 8 and / or the means 9 for holding the workpiece 2 protrude during a relative movement (symbolized by fine arrows) between said cutting tool 8 and said holding means 9, the workpiece 2 being cut between said cutting tool 8 and said holding means 9. The opening 10 of cut is closed by closure means 19, shown in Figure 3.

  The closure means 19, such as flaps, are pivotally mounted and are controlled by a command, preferably, common with the control 23 of the means 9 for holding the workpiece 2 to be cut. In the closed position of the closure means 19, the cutting edge of the cutting tool 8 is protected in the lower chamber 4b of the cutting chamber 4, in order to prevent the operator any risk of injury when positioning the cutting tool. piece 2 to cut on the cutting table 7.

  The station 1 autonomous cutting room 2 is still equipped with an outer conduit 27, flexible conduit type. This outer conduit 27, one end 2: 7a is connectable to the chamber 4 cutting and the other end 27b is positionable in the vicinity of the free end 2a of the part 2 to cut, is intended to suck the l fumes loaded air discharging at the free end 2a of said part 2, during the cutting operation, and convey it towards the chamber 4 cutting.

  The cutting tool 8 of the part 2 to cut affects the general shape of a circular disc whose cutting edge is provided with notches or not. The plane formed by this cutting tool 8 is positioned substantially orthogonal to the longitudinal axis of the part 2 to be cut. The cutting tool 8 is rotated by a motor 11, of the electric motor type, cooled by its own cooling means 12, such as integrated fan. The motor 11 is secured to one of the faces of the lower chamber 4b of the chamber 4 of cutting and partially housed in said lower chamber 4b. An opening 13, formed in a side face of the lower chamber 4b of the chamber 4 cutting, for positioning the means 12 for cooling the motor 11, outside said lower chamber 4b. This positioning of the means 12 for cooling the motor 11, outside the chamber 4b below the chamber 4 cutting, avoids a disturbance of the air contained in said lower chamber 4b, by said means 12 cooling.

  The air purifier 3 with electrostatic filter, positioned substantially vertically above the cutting tool 8 and the means 9 for holding the workpiece 2, is housed in an opening 15 in a wall of the enclosure 4 cutting and seals the latter. This opening 15 is, here, formed on the upper face 14 of the upper chamber 4a of the chamber 4 cutting. Thus, said air purifier 3 serves as an exchange zone between said upper chamber 4a and the atmosphere. The air purifier 3 with electrostatic filter, affecting the shape of a cassette, 25 allows on the one hand, to direct the air contained in the chamber 4 of cutting out of said chamber 4 cutting, in particular to the top, and secondly, to purify the smoke particles, especially harmful, suspended in the air contained in said chamber 4 cutting. Solid arrows symbolize the flow of air passing through the chamber 4 cutting. The electrostatic filter air purifier 3 has means 21 for channeling said upward flow of air, such as a fan, arranged at the top of said air purifier 3, a zone 17, called ionization zone. disposed at the base of said air purifier 3 and a so-called collector zone 20 disposed downstream of said ionization zone 17 with respect to the air flow contained in the chamber 4, between the zone 17 ionization and the means 21 for channeling the air flow contained in the chamber 4 cutting.

  In the ionization zone 17, the particles suspended in the air contained in the cutting chamber 4 are electrically charged, in particular in a positive manner. The ionization zone 17 is formed by wires traversed by an electric current. These wires, traversed by an electric current, give off an energy capable of electrically charging the particles suspended in the air contained in the chamber 4 of cutting.

  Downstream of the ionization zone 17, the collecting zone 20 is arranged. The collecting zone consists essentially of metal blades, in particular aluminum. These metal blades are subjected to an electric field of charge opposite to that of the charged particles, suspended in the air purifier 3 with electrostatic filter. The collecting zone, formed of metal plates on which an electric charge field opposite to that of the charged particles is applied, picks up these charged smoke particles, circulating in the electrostatic filter air purifier 3, before leaving the charged zone. the air of the enclosure 4 cutting.

  Preferably, said air purifier 3 is disposed substantially vertically above the cutting tool 8 and the means 9 for holding the workpiece 2, so as to improve the capture of the fumes released during the operation of the machine. chopped off. It is possible, in an embodiment not shown, to have at least two air purifying cassettes.

  As illustrated in FIG. 3, the cutting chamber 4 is fixed to a U-shaped support 25, forming the frame of said station 1.

  It is also noted that the upper chamber 4a of the chamber 4 has a cutting wall 22, affecting an inverted V shape in cross section. Said wall 22 of the upper chamber 4a forms a wall 22 of confinement and protection, preferably transparent, to allow the operator to follow the cutting operation of the part 2 without risk of injury. This wall 22 is retractable in order to facilitate, on the one hand, the introduction into the chamber 4 of cutting the workpiece 2 to be cut, and on the other hand, the removal of the cut piece 2 of the enclosure 4 cutting, by the operator.

  In a second embodiment of the stand-alone unit 1 of section 2, according to the invention and shown in FIG. 5, only the chamber 4 of section 10 of the part 2, and the table 7 of section on which is positioned part 2 to be cut are modified.

  In this embodiment, the chamber 4 for cutting is formed of a single chamber housing in the lower part the cutting tool 8, and in the upper part 15 the means 9 for holding the workpiece 2 to cut and the air purifier 3 with electrostatic filter. The chamber 4 of cut is provided with two openings 5, 6, arranged opposite one another and intended to be traversed by the part 2 to be cut.

  At the right of each opening 5, 6 is formed a support extending in the direction of the outside of the chamber 4 cutting, these supports forming the cutting table 7 of the part 2 to be cut. The cutting table 7 therefore does not extend inside the enclosure 4. The part 2 to be cut is disposed on the table 7 and passes through the openings 5, 6 opposite. The free end 2a of the part 2 to be cut is positioned in the vicinity of the outlet opening 6.

  In the two embodiments of the invention described above, only the means 9 for holding the workpiece 2 are able to move in the direction of a coming together or a distance from the tool 8 of section, the latter being fixed in translation. It is possible to envisage a variant in which said cutting tool 8 and said holding means 9 move each towards each other or else another variant, in which only the cutting tool 8 moves. to the means 9 for holding the workpiece 2 to be cut. 2914575 II The unit 1 autonomous cutting room 2, works, regardless of the embodiment described, as follows. The piece 2 to be cut is introduced into the chamber 4 through the opening 5, and is disposed in the extended state on the means 18 for bending the cutting table 7, the end 2a of said piece 2 passing through the opening 6 of said chamber 4 cutting. Preferably, the rotary cutting tool 8 operates continuously. The control 23, of the pedal type, actuates the relative movement, in the direction of a coming together, of the holding means 9 towards the cutting tool 8, so that said holding means 9 protrude through the opening 10 cutting. This control 23 simultaneously controls the opening means 19 for closing the opening 10 of cutting. During the cutting operation of the part 2, the fumes emerging from said part 2 are channeled to the purifier 3 with an electrostatic filter, via the means 21 for channeling the air flow. Said air purifier 3 purifies the smoke particles suspended in the chamber 4 cut, produced during the cutting operation of the piece 2, by successive circulation of this air through the ionization zone 17 and the 20 collector zone before leaving the enclosure 4 cutting. When the workpiece 2 is cut, the means 9 for holding said workpiece 2 return to the position of waiting position of a workpiece 2 to be cut, the means 19 for closing the cutting aperture 10 return to the closed position so as to protect the operator from any risk of injury by the cutting tool 8 and the cut piece 2 is discharged through the opening 6 of the chamber 4 cutting.

  Although the invention has been described in connection with several particular embodiments, it is quite obvious that it is in no way limited and that it comprises all the technical equivalents of the means described as well as their combinations, if These are within the scope of the invention.

Claims (10)

  1. station (1) autonomous part cutting (2), such as flexible conduit, comprising at least one material capable of producing a smoke release during the cutting operation, said station (1) comprising at least one enclosure (4) cutting in which is introduced the piece (2) to be cut, said chamber (4) cutting housing at least one cutting tool (8) and means (9) for holding the workpiece (2) to cut against the cutting edge of the cutting tool (8), the cutting tool (8) and the means (9) for holding the workpiece (2) to be cut being driven by a relative displacement between a waiting position positioning the workpiece (2) to be cut and a cutting position of said workpiece (2), characterized in that the cutting chamber (4) is furthermore equipped with at least one scrubber (3) of air with an electrostatic filter through which the air charged with smoke, contained in the chamber (4) cutting, circulates before leaving said chamber (4) cutting.   2. station (1) autonomous part cutting (2), according to claim 1, characterized in that the enclosure (4) sectioned cup, delimits at least a first chamber (4b) housing of the tool (8) for cutting, and a second chamber (4a) for accommodating means (9) for holding the workpiece (2) to be cut, said first (4b) and second (4a) chambers communicating with each other via an opening (10). ) inside which protrude said cutting tool (8) and / or said holding means (9) during a relative movement between said cutting tool (8) and said holding means (9).   3. station (1) autonomous part cutting (2), according to claim 2, characterized in that the air purifier (3) electrostatic filter is housed in an opening (15) formed on one of faces, preferably the face (14) of the top, said second chamber (4a) housing means (9) for holding the workpiece (2) to cut, substantially in line with said means (9) for holding. 12   4. station (1) autonomous part cutting (2), according to one of claims 1 to 3, characterized in that the purifier (3) of electrostatic filter air, affecting the general shape of a cassette, has at least a first zone (17), called ionization, in which the particles suspended in the air contained in the chamber (4) of cutting are electrically charged, a second zone (20), said collector, constituting an electric field of attraction of said charged particles, said electric field being of opposite charge to that of said charged particles, and means (21) for channeling the air contained in said chamber (4) through said first ( 17) and the second (20) zones of the electrostatic filter air purifier (3), for the purpose of rejecting the purified air outside the chamber (4).   5. station (1) autonomous part cutting (2), according to claim 4, characterized in that the zone (17) ionization of particles suspended in the air of the chamber (4) cutting is formed by electric wires traversed by an electric current, while the zone (20) collecting charged particles is composed of metal slats subjected to an electric field. 20   6. station (1) autonomous part cutting (2), according to one of claims 1 to 5, characterized in that it comprises at least one opening (5) formed in a wall of the enclosure (4) cutter for introducing the workpiece (2) to cut, said opening (5) also acting as an air inlet in said chamber (4) 25 cutting. 7 '. Unit (1) autonomous part cutting (2), according to one of claims 1 to 6, characterized in that it is equipped with an outer conduit (27), one end 30 (27a) is connectable to said chamber (4) for cutting and whose other end (27b) is positionable at or near the free end (2a) of the part (2) to be cut, this duct (27) outside sucking the charged air in smoke disengaging at the free end (2a) of said piece (2) and the vehicle in the direction of the chamber (4) cutting. 8. station (1) autonomous part cutting (2) according to one of claims 1 to 7, characterized in that the relative displacement between the cutting tool (8) and the means (9) for maintaining the piece (2) to be cut against the cutting edge of the cutting tool (8) is controlled from a control (23), such as a pedal, external to said cutting chamber (4). 9. station (1) autonomous part cutting (2), according to one of claims 2 to 8, characterized in that the chamber (4) is compartmentalized cutting, for the delineation of the first (4b) and second (4a) chambers, by a partition (16) forming a table (7) for cutting said piece (2) to cut. 10. station (1) autonomous part cutting (2), according to one of claims 2 to 9, characterized in that the opening (10) for cutting between the first (4b) and second (4a) chambers is closed by means of shutter (19) controlled, preferably by a command com- manme to the control (23) actuating relative movement of the means (9) for holding and the tool (8) cutting. 14