Anti-interference device and conveyor device with such an anti-interference device

Abstract

Anti-interference device for preventing intervention into a working space with moving components on a conveyor device (2), comprising: - a flexible, rollable material web (3) which has on each of its two opposite longitudinal edges a row of several discrete fastening means (5) arranged at a distance from one another, wherein - the fastening means (5) are designed to fasten the flexible, rollable material web (3) to oppositely arranged rigid longitudinal supports (6) which delimit a working space with moving components on a conveyor device (2) from two opposite sides.

Description

The invention relates to an intervention protection device for preventing the intervention in a working space with moving components on a conveying device. The invention also relates to a conveying device with such an intervention protection device.US 5 078 250 describes a conveyor guard with an adjustable support system comprising a plurality of frame modules each having a support arm comprising at least two longitudinally arranged, slidingly overlapping elements. First fastening means serve for adjustably fixing the length of the respective support arm. At least one support strut has at least two longitudinally disposed, slidingly intersecting elements. Second fastening means serve for adjustably fixing the length of the at least one support strut. First mounting means is for mounting the at least one support strut to the support arm such that the at least one strut is disposed substantially perpendicular to the support arm, and second mounting means is for mounting the frame modules adjacent a conveyor.It is an object of the invention to provide an engagement protection device for preventing the engagement in a working space with moving components on a conveying device, which can be transported in a simple manner to the mounting location of the conveying device and can be mounted on the conveying device with little assembly effort.The object is achieved by an engagement protection device for preventing the engagement in a working space with moving components on a conveying device, comprising:a flexible web of rollable material having at each of its two opposite longitudinal edges a row of a plurality of discrete fastening means arranged at a distance from one another, whereinthe fastening means are designed for fastening the flexible, rollable material web to oppositely arranged rigid longitudinal beams, which delimit a working space with moving components on a conveying device from two opposite sides.Conveying devices, such as bulk material conveyors or bulk material conveyors, have moving components. These moving components can be, in particular, rollers of a roller conveyor track, motor shafts, drive shafts and / or other moving components or assemblies. In order to achieve sufficient machine safety, such moving components must be protected from intervention by persons, or an unauthorized or unintentional intervention in such working spaces, for example, by fingers of a person's hand, by his hands or arms, must be reliably prevented so that persons do not suffer damage.It is known to make rigid plates of closed area as interference protection devices, such as sheets, which are screwed to frame parts of machines or devices. In order to enable a halfway practicable transport of such rigid panels to the machine or apparatus to which the panels are to be attached, such panels are made relatively small compared to the overall size of the machine or apparatus, so that a plurality of individual panels have to be manufactured, transported and assembled. This is very time-consuming and, owing to the rigidity of the plates, these may still have to be trimmed to size on site on the machine or device, which is associated with a high production outlay. This is particularly disadvantageous in particular when the machine or the device, as in the case of conveying devices, are sometimes many metres long, in particular can also be 50 or 100 metres long, for example. In this respect, a very large number of individual plates would then have to be produced, transported and mounted.Another method of securing a hazardous working area of a machine or device against unauthorized entry can be rigid fences which are placed at a certain distance from the machine or device, so that a person cannot even get close to the machine or device. However, such separately installed protective housings are very expensive and require additional installation space or installation area at the location of the machine or device. In this case, too, the transport of the individual rigid fence elements is complicated and the assembly time-consuming.According to the invention, by virtue of the fact that the intervention protection device comprises a flexible, rollable material web which has a row of a plurality of discrete fastening means arranged at a distance from one another on each of its two opposite longitudinal edges, wherein the fastening means are designed for fastening the flexible, rollable material web to rigid longitudinal members arranged opposite one another, which delimit a working space with moving components on a conveying device from two opposite sides, it is possible, for example, for a material web of a length of many metres, in particular a length of several 10 metres, to be transported in a state in which it is rolled up to form a roll and to be unrolled and mounted only on site on the conveying device. For this purpose, for example, initially only a short piece of the material web can be unwound from the roll and this short piece can be fastened to the conveying device. Subsequently, a further piece of the material web can be unwound from the roll and this further short piece can then be fastened to the conveying device. This can be done piece by piece multiple times until the entire material web is fastened to the conveying device. If, after complete clothing of the conveying device, an unused remaining piece of the material web remains to the required extent, this remaining piece can be cut off in a simple manner due to the flexible property of the material web.The discrete fastening means arranged at the two opposite longitudinal edges of the material web in each case spaced apart from one another in rows allow such sectional mounting of the material web, since the plurality of discrete fastening means can be fastened successively to the conveying device even if a partial length of the material web is still in a wound state, for example as a roll.Even if the flexible material web is designated as rollable, this does not exclude that the flexible material web is possibly also not wound up, but rather can be folded, in particular alternately folded forwards and backwards, deposited for transport. The flexible material web can accordingly be deposited folded in the manner of a Leporellos.Due to the flexibility of the material web, dimensional deviations on the conveying device can also be compensated for, so that the material web does not require any special blank on site. This can also significantly shorten the assembly time.The intervention protection device according to the invention can be used in particular on an underside of the conveying device. If necessary, however, lateral regions of the conveying device can also be secured by laterally mounted intervention protection devices according to the invention.The fastening means can be formed by eyes, the eye openings of which are designed for inserting in each case a threaded section of a screw or a threaded rod, which are provided for firmly screwing the engagement protection device to rigid longitudinal beams arranged opposite one another, which delimit a working space with moving components on a conveying device from two opposite sides.The complete intervention protection device according to the invention can thus already be formed solely by the flexible, rollable material web which is provided with the eyes as fastening means. In this case, the longitudinal edges of the flexible, rollable material web can be folded over a section width, so that a double-layer structure of the material web results at the two opposite edge sections of the longitudinal edges, along which the eyes are attached. Such a double layer reinforces the areas in which the eyes are attached, so that the risk of undesired tearing out can be minimized.The eyelets may be commercially available eyelets. The eyelets can be produced, for example, according to DIN 7332.The eyelets may be attached at equal distances from one another to the two opposite longitudinal edges of the flexible, rollable material web. The opening width of the eyelet openings can substantially correspond to the diameters of the screws or threaded rods interacting with the eyelets, as long as they can be inserted through the eyelets. Due to the flexible, rollable material web, which as such already has a comparatively low weight per unit area to rigid plates, and the use of eyelets, which are also characterized by a relatively low weight, an overall very light engagement protection device can be provided.The flexible web of material which can be rolled up can be formed by a planar textile structure from the group of textile structures comprising woven fabrics, knitted fabrics, knitted fabrics, braids, stitch-bonded fabrics, nonwoven fabrics and felts.The textile structures can comprise synthetic fibers and / or natural fibers. In order to ensure high strength, the textile structures can also consist of carbon fibers, glass fibers and / or aramid fibers, for example, or contain these.The flexible web of material which can be rolled up can be formed by a planar network of yarns, plastic cords or wires with a mesh width which is selected to be small enough to reliably prevent fingers of a human hand from being pushed through.In contrast to textile structures which are at least largely formed with a closed surface, the flexible, rollable material web can optionally also be formed as a planar net.In order that the mesh has a mesh width which is so small that fingers of a human hand are reliably prevented from being pushed through, the mesh width of the mesh can be, for example, less than 10 millimeters, in particular less than 5 millimeters.The flexible web of material which can be rolled up can have a high degree of stretching rigidity in its surface plane.The high extension stiffness of the flexible, rollable material web can be selected to be high enough that a flat pressing-in of a flexible, rollable material web stretched on opposite rigid longitudinal beams, which delimit a working space with moving components on a conveying device from two opposite sides, is only possible to such an extent that the flat pressing-in does not lead to any contact with moving components of a conveying device present in the working space.The engagement protection device can comprise at least two rigid longitudinal beams arranged opposite one another, to which the flexible, rollable material web is fastened in a clamped manner via its fastening means.The rigid longitudinal beams may be part of a frame. The rigid longitudinal beams can be formed, for example, by machine elements of the conveying device. These can be, for example, the carriers on which the conveying means, such as a conveyor belt or a plurality of conveying rollers, are movably mounted. Alternatively, the rigid longitudinal members can also be formed by longitudinal members which are separate per se from the conveying device and which can be subsequently attached to the conveying device. The rigid longitudinal beams form receptacles to which the flexible, rollable material web of the intervention protection device is attached. The rigid longitudinal members can be designed in such a way that they likewise prevent lateral engagement or gripping around the edge sections of the flexible, rollable material web. Thus, the rigid longitudinal members can, on the one hand, end flush with a frame part of the conveying device and, on the other hand, the flexible, rollable material web can likewise be fastened flush to the rigid longitudinal members, with the result that engagement between the flexible, rollable material web and the respective rigid longitudinal member is likewise prevented.By fastening them to the two opposite rigid longitudinal beams, the flexible, rollable material web can be fastened to the latter under tension.A respective longitudinal member can have an undercut longitudinal groove, in the groove path of which a plurality of slot nuts are mounted so as to be longitudinally displaceable, wherein each slot nut has an internal thread for receiving a threaded section of a screw or of a threaded rod.Due to the longitudinal displaceability of the slot nuts in the slot tracks, the threaded sections of screws or the threaded rods can be displaced in the longitudinal direction of the respective longitudinal beams. Such displacement can be used to bring the screws or the threaded rods into exact alignment with the eyelet openings or the other fastening means of the flexible, rollable material web. For example, inaccuracies in the position of the eyelets or the other fastening means along the opposite longitudinal edges of the flexible, rollable material web can be compensated for and / or the flexible, rollable material web can be put under tension in different sections of the material web in different ways. Due to the longitudinal displaceability of the slot nuts in the slot webs, it is also possible to compensate for spacing tolerances of the respective adjacent eyes or other fastening means, which could add up over the entire length of the flexible, rollable material web.In the embodiment in which the slot nuts have internal threads for receiving a threaded section of a screw or a threaded rod, the slot nuts are formed separately from the screws or threaded rods.In a modified embodiment, the slot nuts can be formed integrally with the threaded rods.In this case, a respective longitudinal member can have an undercut longitudinal groove, in the groove path of which a plurality of slot nuts are mounted so as to be longitudinally displaceable, wherein each slot nut forms a foot section of a threaded rod, the threaded shank section of which projects from the longitudinal groove.In this modified embodiment too, the threaded rods can be displaced in the longitudinal direction of the respective longitudinal beams because of the longitudinal displaceability of the slot nuts in the slot tracks. Such a displacement can be used to bring the threaded rods into exact alignment with the eyelet openings or the other fastening means of the flexible, rollable material web. For example, inaccuracies in the position of the eyelets or other fastening means along the opposite longitudinal edges of the flexible, rollable material web can be compensated for and / or the flexible, rollable material web can be put under tension in different sections of the material web in different ways. Due to the longitudinal displaceability of the slot nuts in the slot webs, it is also possible to compensate for spacing tolerances of the respective adjacent eyes or other fastening means, which could add up over the entire length of the flexible, rollable material web.The flexible web of material which can be rolled up can be screwed firmly via its fastening means, in particular via its eyes, by means of the screws or threaded rods which are guided in the longitudinal grooves of the longitudinal beams by the longitudinally displaceable slot nuts.The flexible, rollable material web can be fastened via its fastening means, in particular via its eyes, by means of the threaded rods guided in the longitudinal grooves of the longitudinal beams through the longitudinally displaceable slot nuts, in that the fastening means, in particular the eyes of the flexible, rollable material web, are screwed to the threaded rods by means of nuts.Fastening by means of nuts has the advantage that the threaded rods can already be preassembled on the longitudinal members, wherein then, for mounting the flexible, rollable material web, only the respective locally close eyelet of the flexible, rollable material web has to be plugged onto the associated threaded rod and the eyelet is subsequently secured by means of the nut screwed onto the threaded rod.A washer, for example a washer according to DIN 9021, can optionally be inserted between the nut and the eyelet, which washer can completely cover the associated eyelet. Alternatively, the nut can also be designed as a nut with a collar, for example as a flange nut according to DIN 6923 or DIN 6926 with a securing ring.The nuts can also be secured by additional threaded counter nuts. The lock nuts can be designed as cap nuts, for example according to DIN 1587.The flexible, rollable material web can carry at its front transverse edge a first clamping strip which is designed for fastening the front transverse edge of the flexible, rollable material web to a front cross member which delimits a working space with moving components on a conveying device from the front.The front cross member can thus be a machine element of the conveying device. The first clamping strip forms a separate connecting member for fastening the flexible, rollable material web to the front cross member.The first clamping strip can be formed in two parts and can have, for example, an upper sheet metal strip which is placed on one surface side of the flexible, rollable material web at its front transverse edge, and a lower sheet metal strip which is placed on the opposite other surface side of the flexible, rollable material web at its front transverse edge. The front transverse edge of the flexible web of material which can be rolled up can thus be clamped between the upper sheet metal strip and the lower sheet metal strip.The upper sheet metal strip can be folded over at least one of its longitudinal edges, so that there results on the one hand a reinforced double layer of the upper sheet metal strip and on the other hand the edge of this longitudinal edge is less sharp-edged due to the bent-over region. Such rounding of the longitudinal edge of the upper sheet metal strip achieved by bending can at least reduce or even completely prevent the risk of undesired cutting-in or clamping-off of the flexible, roll-up material web.The lower sheet metal strip can have a first tab section bent over by approximately 90 degrees on one of its longitudinal edges. The first tab section can extend with its tab plane at least substantially perpendicular to the surface plane of the remaining lower sheet metal strip. The first tab section can be bent slightly more than 90 degrees, so that a type of groove-like pocket is formed into which the folded over, reinforced double layer of the upper sheet metal strip can be inserted in a positive-locking manner. Between the folded-over, reinforced double layer of the upper sheet metal strip and the bent-over first tab section of the lower sheet metal strip, the front transverse edge of the flexible, rollable material web can be clamped in.For a clamped fastening of the flexible, rollable material web to the first clamping strip, the upper sheet metal strip and the lower sheet metal strip can be provided with aligned bores into which screws can be inserted and screwed firmly by means of nuts in order to be able to screw together the upper sheet metal strip and the lower sheet metal strip with intermediate clamping of the flexible, rollable material web. A washer, for example according to DIN 9021, can be inserted under a respective nut. Alternatively, the respective nut can also be designed as a nut with a collar, for example as a flange nut according to DIN 6923 or DIN 6926 with a securing ring.The flexible, rollable material web can carry at its rear transverse edge a second clamping strip which is designed for fastening the rear transverse edge of the flexible, rollable material web to a rear cross member which delimits a working space with moving components on a conveying device from behind.The rear cross member, like the front cross member, can be a machine element of the conveying device. The second clamping strip also forms a separate connecting member in this case in order to fasten the flexible, rollable material web to the rear cross member.The second clamping strip can be formed in two parts and can have, for example, an upper sheet metal plate which is placed on one surface side of the flexible web of material which can be rolled up at its rear transverse edge, and a lower sheet metal plate which is placed on the opposite other surface side of the flexible web of material which can be rolled up at its rear transverse edge. The rear transverse edge of the flexible web of material which can be rolled up can thus be clamped between the upper sheet metal plate and the lower sheet metal plate.The upper sheet metal plate can be folded over on at least one of its longitudinal edges in a manner analogous to the upper sheet metal strip of the first clamping strip, so that there results on the one hand a reinforced double layer of the upper sheet metal plate and on the other hand the edge of this longitudinal edge is less sharp-edged due to the bent-over region. Such rounding of the longitudinal edge of the upper sheet metal plate achieved by bending can at least reduce or even completely prevent the risk of undesired cutting-in or clamping-off of the flexible, roll-up material web.The lower sheet metal plate can have at one of its longitudinal edges a second tab section bent over by approximately 90 degrees. The second tab section can extend with its tab plane at least substantially perpendicular to the surface plane of the remaining lower sheet metal plate. The second tab section can be bent slightly more than 90 degrees, so that a type of groove-like pocket is formed into which the folded over, reinforced double layer of the upper sheet metal plate can be inserted in a positive-locking manner. Between the folded-over, reinforced double layer of the upper sheet metal plate and the bent-over second tab section of the lower sheet metal plate, the rear transverse edge of the flexible, rollable material web can be clamped in.For a clamped fastening of the flexible, rollable material web to the second clamping strip, the upper sheet metal plate and the lower sheet metal plate can be provided with aligned bores into which screws can be inserted and screwed firmly by means of nuts in order to be able to screw together the upper sheet metal plate and the lower sheet metal plate with intermediate clamping of the flexible, rollable material web. A washer, for example according to DIN 9021, can be inserted under a respective nut. Alternatively, the respective nut can also be designed as a nut with a collar, for example as a flange nut according to DIN 6923 or DIN 6926 with a securing ring.The lower sheet metal plate can also have slots instead of simple circular bores. In an assembled state of the second clamping strip with the flexible, rollable material web, these elongated holes extend in the longitudinal extension direction of the flexible, rollable material web. By means of such slots, the second clamping strip can be screwed firmly in variable positions on the rear cross member. Thus, the required tensile stress in the flexible, rollable material web can be adjusted by means of the second clamping strip, in that the second clamping strip can be screwed onto the rear cross member selectively in different relative positions with respect to the latter. The second clamping strip thus forms a clamping means in order to be able to fasten the flexible, rollable material web to the conveying device with a desired or required tensile stress. If the two longitudinal beams are provided with grooves and longitudinally displaceable nuts, the flexible, rollable material web can first be fastened to the conveying device by means of the first clamping strip and the second clamping strip while setting a tensile stress and only then can the further screws, nuts or other fastening means be tightened in order to firmly screw the flexible, rollable material web at its two opposite longitudinal edges.The object is also achieved by a conveying device, in particular a bulk material conveyor or a bulk material conveyor, having at least one intervention protection device according to one of the described embodiments.A specific exemplary embodiment of the invention is explained in more detail in the following description with reference to the appended figures. Specific features of this exemplary embodiment may represent general features of the invention, if appropriate also individually or viewed in further combinations, regardless of the specific context in which they are mentioned.The following are shown: FIG. 1 shows a partial illustration of an intervention protection device in an exemplary embodiment in isolation, FIG. 2 shows a perspective illustration of the intervention protection device according to FIG. 1 in an installation situation on a conveying device, FIG. 3 is an exploded view of a first clamping strip for a front transverse edge of a flexible web of material which can be rolled up, of the engagement protection device according to FIG. 1, FIG. 4 is an exploded view of a second clamping strip of a rear transverse edge of a flexible web of material which can be rolled up, of the engagement protection device according to FIG. 1, FIG. 5 shows a perspective illustration of the engagement protection device according to FIG. 1 in an installation situation on a conveying device in the region of the front transverse edge with a first clamping strip according to FIG. 3, FIG. 6 is an exploded view of a nut and a counter nut on a threaded rod which is passed through an eye opening of the flexible, rollable material web, FIG. 7 shows the nut and the counter nut on a threaded rod according to FIG. 6 which is passed through an eye opening of the flexible web of material which can be rolled up, in the assembled state, and FIG. 8 shows a perspective illustration of the flexible, rollable material web in a stand-alone position in a rolled-up transport state.FIG. 1 shows a subsection of an engagement protection device 1.The engagement protection device 1 serves to prevent engagement with a working space with moving components on a conveying device 2 (FIG. 2 ).The engagement protection device 1 comprises a flexible, rollable material web 3 which has a respective row of a plurality of discrete fastening means 5 arranged at a distance from one another on its two opposite longitudinal edges 4.The fastening means 5 are designed for fastening the flexible, rollable material web 3 to rigid longitudinal supports 6 (FIG. 2 ) arranged opposite one another, which delimit a working space with moving components on the conveying device 2 from two opposite sides.In the case of the present exemplary embodiment, the fastening means 5 are formed by eyes 5 a, the eye openings of which are designed for respectively inserting a threaded section of a screw or a threaded rod 7 (FIG. 6 ), which are provided for firmly screwing the engagement protection device 1 to rigid longitudinal beams 6 arranged opposite one another, which delimit a working space with moving components on the conveying device 2 from two opposite sides.The flexible web 3 which can be rolled up can be formed either by a planar textile structure from the group of textile structures comprising woven fabrics, knitted fabrics, knitted fabrics, braids, stitch-bonded fabrics, nonwoven fabrics and felts, or by a planar network of yarns, plastic cords or wires with a mesh width which is selected to be small enough to reliably prevent fingers of a human hand from being pushed through.The flexible web 3 which can be rolled up has a high degree of stretching rigidity in its surface plane. The high extension stiffness of the flexible, rollable material web 3 can be selected to be high enough that a flat pressing-in of a flexible, rollable material web 3 stretched on opposite rigid longitudinal beams 6, which delimit a working space with moving components on the conveying device 2 from two opposite sides, is only possible to such an extent that the flat pressing-in does not lead to any contact with moving components of a conveying device 2 present in the working space.In the case of the present exemplary embodiment, the engagement protection device 1 comprises two opposite rigid longitudinal beams 6, to which the flexible, rollable material web 3 is attached in a clamped manner via its fastening means 5.As can be seen in particular in FIG. 2, a respective longitudinal member 6 has an undercut longitudinal groove 8, in the groove path 8 aof which a plurality of slot nuts 9 are mounted so as to be longitudinally displaceable, wherein each slot nut 9 has an internal thread for receiving a threaded section of a screw or of a threaded rod 7.As an alternative to a slot nut 9 with an internal thread, the respective longitudinal member 6 can have an undercut longitudinal groove 8, in the groove path 8 aof which a plurality of slot nuts 9 are mounted so as to be longitudinally displaceable, wherein each slot nut 9 forms a foot section 9 aof a threaded rod 7 a, the threaded shank section of which protrudes from the longitudinal groove 8.The flexible web 3 which can be rolled up is screwed firmly via its fastening means 5, in particular via its eyes 5a, by means of the screws or threaded rods 7, 7a which are guided in the longitudinal grooves 8 of the longitudinal beams 6 by the longitudinally displaceable slot nuts 9, as is shown in more detail in FIGS. 6 and 7, for example.In the case of the present exemplary embodiment, the flexible, rollable material web 3 is fastened via its fastening means 5, in particular via its eyes 5 a, by means of the threaded rods 7, 7 aguided in the longitudinal grooves 8 of the longitudinal beams 6 by the longitudinally displaceable slot nuts 9, in that the fastening means 5, in particular the eyes 5 aof the flexible, rollable material web 2, are screwed firmly to the threaded rods 7, 7 aby means of nuts 10.The nuts 10 can be secured, as shown, by additional threaded counter nuts 11. As illustrated, the nuts can be designed as nuts 10 with a collar, for example as flanged nuts according to DIN 6923 or DIN 6926 with a securing ring.The nuts 10 can also be secured by the additional threaded counter nuts 11. The lock nuts 11 can be designed, for example, as shown, as cap nuts, for example according to DIN 1587.The flexible, rollable material web 3 can carry on its front transverse edge 3 aa first clamping strip 12.1, which is designed for fastening the front transverse edge 3 aof the flexible, rollable material web 3 to a front cross member 13.1 (FIG. 5 ) which delimits a working space with moving components on the conveying device 2 from the front.The front cross member 13.1 can thus be a machine element of the conveying device 2. The first clamping strip 12.1 forms a separate connecting member in order to fasten the flexible, rollable material web 3 to the front cross member 13.1.In the case of the illustrated exemplary embodiment of FIG. 3, the first clamping strip 12.1 is embodied in two parts and comprises an upper sheet metal strip 14.1, which is placed on one surface side of the flexible, rollable material web 3 at its front transverse edge 3a, and a lower sheet metal strip 14.2, which is placed on the opposite other surface side of the flexible, rollable material web 3 at its front transverse edge 3a. The front transverse edge 3a of the flexible web 3 which can be rolled up can thus be clamped between the upper sheet metal strip 14.1 and the lower sheet metal strip 14.2.The upper sheet metal strip 14.1, as shown, can be folded over at least one of its longitudinal edges, so that there results on the one hand a reinforced double layer 15 of the upper sheet metal strip 14.1 and on the other hand the edge of this longitudinal edge is less sharp-edged due to the bent-over region. Such rounding of the longitudinal edge of the upper sheet metal strip 14.1 achieved by bending can at least reduce or even completely prevent the risk of undesired cutting-in or clamping-off of the flexible, roll-up material web 3.The lower sheet metal strip 14.2, as shown, can have a first tab section 16.1, which is bent over by approximately 90 degrees, at one of its longitudinal edges. The first tab section 16.1 can extend with its tab plane at least substantially perpendicular to the surface plane of the remaining lower sheet metal strip 14.2. The first tab section 16.1 can be bent over slightly more than 90 degrees, so that a type of groove-like pocket is formed into which the folded over reinforced double layer 15 of the upper sheet metal strip 14.1 can be inserted in a positive-locking manner. Between the folded-over, reinforced double layer 15 of the upper sheet metal strip 14.1 and the bent-over first tab section 16.1 of the lower sheet metal strip 14.2, the front transverse edge 3a of the flexible, rollable material web 3 can be clamped in.For a clamped fastening of the flexible, rollable material web 3 to the first clamping strip 12.1, the upper sheet metal strip 14.1 and the lower sheet metal strip 14.2 can be provided with aligned bores 17, into which screws 18 can be inserted and screwed firmly by means of nuts 19 in order to be able to screw together the upper sheet metal strip 14.1 and the lower sheet metal strip 14.2 with intermediate clamping of the flexible, rollable material web 3. A washer 20, for example according to DIN 9021, can be inserted under a respective nut 19.The flexible, rollable material web 3 can carry at its rear transverse edge a second clamping strip 12.2, which is designed for fastening the rear transverse edge of the flexible, rollable material web 3 to a rear cross member, which delimits a working space with moving components on the conveying device 2 from behind.The rear cross member, like the front cross member 13.1, can be a machine element of the conveying device 2. The second clamping strip 12.2 also forms a separate connecting member in this case in order to fasten the flexible, rollable material web 3 to the rear cross member.The second clamping strip 12.2 can be formed in two parts and can have, for example, an upper sheet metal plate 21.1, which is placed on one surface side of the flexible, rollable material web 3 at its rear transverse edge, and a lower sheet metal plate 21.2, which is placed on the opposite other surface side of the flexible, rollable material web 3 at its rear transverse edge. The rear transverse edge of the flexible web 3 which can be rolled up can thus be clamped between the upper sheet metal plate 21.1 and the lower sheet metal plate 21.2.The upper sheet metal plate 21.1 can be folded over on at least one of its longitudinal edges in a manner analogous to the upper sheet metal strip 14.1 of the first clamping strip 12.1, so that there on the one hand a reinforced double layer of the upper sheet metal plate 21.1 results and on the other hand the edge of this longitudinal edge is less sharp-edged due to the bent-over region. Such rounding of the longitudinal edge of the upper sheet metal plate 21.1 achieved by bending can at least reduce or even completely prevent the risk of undesired cutting-in or clamping-off of the flexible, roll-up material web 3.The lower sheet metal plate 21.2 can have a second tab section 16.2 bent over by approximately 90 degrees at one of its longitudinal edges. The second tab section 16.2 can extend with its tab plane at least substantially perpendicular to the surface plane of the remaining lower sheet metal plate 21.2. The second tab section 16.2 can be bent slightly more than 90 degrees, so that a type of groove-like pocket is formed into which the folded over reinforced double layer 15 of the upper sheet metal plate 21.1 can be inserted in a positive-locking manner. The rear transverse edge of the flexible web 3 which can be rolled up can be clamped between the folded-over, reinforced double layer 15 of the upper sheet metal plate 21.1 and the bent-over second tab section 16.2 of the lower sheet metal plate 21.2.For a clamped fastening of the flexible, rollable material web 3 to the second clamping strip 12.2, the upper sheet metal plate 21.1 and the lower sheet metal plate 21.2 can be provided with aligned bores 17, into which screws 18 can be inserted and screwed firmly by means of nuts 19 in order to be able to screw together the upper sheet metal plate 21.1 and the lower sheet metal plate 21.2 with intermediate clamping of the flexible, rollable material web 3. As is shown in FIG. 4, the respective nut 19 can also be designed as a nut 19 awith a collar, for example as a flange nut according to DIN 6923 or DIN 6926 with a securing ring.The lower sheet metal plate 21.2 can also have elongated holes 22 instead of simple circular holes 17. In an assembled state of the second clamping strip 12.2 with the flexible, rollable material web 3, these elongated holes 22 extend in the direction of longitudinal extent of the flexible, rollable material web 3. Thus, the required tension in the flexible, rollable material web 3 can be adjusted by means of the second clamping strip 12.2, in that the second clamping strip 12.2 can be screwed onto the rear cross member selectively in different positions relative to the latter. The second clamping strip 12.2 thus forms a clamping means in order to be able to fasten the flexible, rollable material web 3 to the conveying device 2 with a desired or required tensile stress. If the two longitudinal beams 6 are provided with longitudinal grooves 8 and longitudinally displaceable nuts 9, the flexible, rollable material web 3 can first be fastened to the conveying device 2 by means of the first clamping strip 12.1 and the second clamping strip 12.2 while setting a tensile stress and only then can the further screws, nuts 10 or other fastening means 5 be tightened in order to firmly screw the flexible, rollable material web 3 at its two opposite longitudinal edges.Finally, FIG. 8 shows a flexible, rollable material web 3 with the fastening means 5 alone in a rolled-up state, in which a very long flexible, rollable material web 3 is also rolled up in a compact manner for transport to form a roll 23.References included in the specificationThis list of documents cited by the applicant has been produced in an automated manner and is only included for the better information of the reader. The list is not part of the German patent application or utility model application. The DPMA does not take any adhesion for any faults or omissions.Patent Literature citedU.S. Pat. No. 5,078,250

[0002] Cited Non-Patent LiteratureDIN 6923 [0036, 0043, 0049, 0079]DIN 6926 [0036, 0043, 0049, 0079]

Claims

An intervention protection device for preventing the intervention in a working space with moving components on a conveying device (2), comprising: - a flexible, rollable material web (3) which has a respective row of a plurality of discrete fastening means (5) arranged at a distance from one another on its two opposite longitudinal edges, wherein - the fastening means (5) are designed for fastening the flexible, rollable material web (3) to rigid longitudinal beams (6) arranged opposite one another, which delimit a working space with moving components on a conveying device (2) from two opposite sides.The anti-intervention device according to claim 1, characterized in that the fastening means (5) are formed by eyes (5a), the eye openings of which are configured for inserting in each case a threaded section of a screw or a threaded rod (7) which are provided for firmly screwing the anti-intervention device (1) to rigid longitudinal beams (6) arranged opposite one another, which delimit a working space with moving components on a conveying device (2) from two opposite sides.The intervention protection device according to claim 1 or 2, characterized in that the flexible, rollable material web (3) is formed by a planar textile structure from the group of textile structures comprising woven fabrics, knitted fabrics, knitted fabrics, braids, stitch-bonded fabrics, nonwoven fabrics and felts.The intervention protection device according to claim 1 or 2, characterized in that the flexible, rollable material web (3) is formed by a planar net of yarns, plastic cords or wires with a mesh width which is selected to be small enough to reliably prevent fingers of a human hand from being inserted through.Intervention protection device according to one of Claims 1 to 4, characterized in that the flexible, rollable material web (3) has a high degree of extensional rigidity in its surface plane.The intervention protection device according to claim 5, characterized in that the high extension stiffness of the flexible rollable material web (3) is selected to be high enough that a flat pressing-in of a flexible rollable material web (3) stretched on opposite rigid longitudinal beams (6) which delimit a working space with moving components on a conveying device (2) from two opposite sides is possible only to such an extent that the flat pressing-in does not lead to any contact with moving components of a conveying device (2) present in the working space.The intervention protection device according to any one of claims 1 to 6, characterized byat least two opposite rigid longitudinal beams (6) to which the flexible, rollable material web (3) is attached in a clamped manner via its fastening means (5).The intervention protection device according to claim 7, characterized in that a respective longitudinal member (6) has an undercut longitudinal groove (8), in the groove path (8a) of which a plurality of slot nuts (9) are mounted so as to be longitudinally displaceable, wherein each slot nut (9) has an internal thread for receiving a threaded section of a screw or a threaded rod (7).The intervention protection device according to claim 7, characterized in that a respective longitudinal member (6) has an undercut longitudinal groove (8), in the groove path (8a) of which a plurality of slot nuts (9) are mounted so as to be longitudinally displaceable, wherein each slot nut (9) forms a foot section of a threaded rod (7a), the threaded shank section of which protrudes from the longitudinal groove (8).The intervention protection device according to claim 8 or 9, characterized in that the flexible, rollable material web (3) is screwed firmly via its fastening means (5), in particular via its eyes (5a), by means of the screws or threaded rods (7, 7a) guided in the longitudinal grooves (8) of the longitudinal beams (6) through the longitudinally displaceable slot nuts (9).The intervention protection device according to claim 10, characterized in that the flexible, rollable material web (3) is fastened via its fastening means (5), in particular via its eyes (5a), by means of the threaded rods (7) guided in the longitudinal grooves (8) of the longitudinal beams (6) through the longitudinally displaceable slot nuts (9), in that the fastening means (5), in particular the eyes (5a) of the flexible, rollable material web (3), are screwed to the threaded rods (7, 7a) by means of nuts (10).The intervention protection device according to claim 11, characterized in that the nuts (10) are secured by additional threaded counter nuts (11).The intervention protection device according to any one of claims 1 to 12, characterized in that the flexible rollable material web (3) carries on its front transverse edge (3a) a first clamping strip (12.1) which is designed for fastening the front transverse edge (3a) of the flexible rollable material web (3) to a front cross member (13.1) which delimits a working space with moving components on a conveying device (2) from the front.The intervention protection device according to any one of claims 1 to 13, characterized in that the flexible, rollable material web (3) carries on its rear transverse edge a second clamping strip (12.2), which is designed for fastening the rear transverse edge of the flexible, rollable material web (3) to a rear cross member, which delimits a working space with moving components on a conveying device (2) from behind.Conveying device, in particular bulk material conveyor or bulk material conveyor, having at least one engagement protection device (1) according to one of Claims 1 to 14.

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