SCRAPER DEVICE FOR FITTING TO A CONVEYOR BELT

Abstract: Scraper device for fitting to an endless conveyor belt or similar device, consisting of a set of scraper elements (1, 1′) supported by an elongate carrier member the scraper elements (1, 1′) being mounted on at least one bar-like member (2, 2′) which extends parallel to the carrier member and rests on the upper face of the carrier member, and which is fastened relative to the carrier member by means of detachable fastening means (8, 9; 10, 11, 12) which are mounted at the ends of the bar-like member. Preferably the fastening means are formed by at least one pin (9) projecting from a side edge of the carrier beam (7) and at least one recess formed in the bar-like member (2,2′) in which recess said pin is received and by an upstanding flange (10) which is provided with an opening and which lies next to a flange formed on the carrier beam and provided with an opening, and by a securing means inserted through the coinciding openings in the flanges.

Description: The invention relates to a scraper device for an endless conveyor belt, said scraper device consisting of a set of scraper elements each of which has a scraper blade and which lie substantially next to one another and are supported by an elongate carrier member which extends transversely of the longitudinal direction of the conveyor belt and is mounted on the frame of the conveyor belt in such a manner that the scraper blades of the scraper elements come to lie with their free edges against the lower face of the lower run of the conveyor belt, the scraper elements being mounted on at least one bar-like member which extends parallel to the carrier member and rests on the top of said carrier member, and which is fastened relative to the carrier member by means of detachable fastening means which are mounted at the ends of the bar-like member. A scraper device of this kind is known from US-A-45 33 037. US-A-4533037 discloses a scraper device for cleaning a conveyor belt in which a plurality of scraper elements are mounted on a rectangular tubular carrying member which may be segmented into a plurality of abutting segments connected to each other and which is supported by and encloses a bar-like support member, rollers being interposed between said support member and said carrying member for rolling the carrying member along the support member to permit removal of said carrying member from the conveyor through an access opening if a scraper element has to be replaced. The assembly comprising said carrying member and support member is mounted for a rotational movement about the axis of the support member to permit rotation of said assembly until the scraper elements disengage the conveyor belt. Another scraper device is described in GB-A-2125357 in which the scraper elements are mounted on one single bar-like member, so that whenever a scraper element has to be replaced in a scraper device mounted on a conveyor belt, for example because its scraper blade has worn, the carrier member with the bar-like member resting on its top has to be pulled downwardly to clear the scraper blades from the belt whereupon the bar-like member has to be slid along the carrier member to the outside, which is a troublesome and time-consuming operation. Thus this prior art device suffers from the same disadvantage as the previously described prior art device. The invention seeks to provide a scraper device of the type described, which is exempt from this disadvantage. This aim is achieved in that in the scraper device according to the invention the scraper elements are divided into two groups and mounted on two bar-like members resting on the top of the carrier member and lying in line with and adjacent one another, while the fastening means, at the mutually facing ends of the bar-like members, are formed each by projection and correspondingly mating receiving means which are formed respectively on the carrier member and on the bar-like member in which receiving means said projection means is received in interengaging relationship in such a manner that a displacement of a bar-like member in a direction away from the fastening means formed on the carrier member will enable said projection and receiving means to be slid out of engagement with one another, and the other fastening means at the mutually remote ends of the bar-like members are each formed by abutment and corresponding securing means so that said displacement of a bar-like member is possible only after said securing means has been detached. In this way, for the purpose of replacing a scraper element only one fastening means has to be detached, while in addition the respective barlike member can thereupon be removed easily. The carrier member is advantageously formed by a beam having a rectangular section, and each bar-like member is advantageously formed by a bar having a U-shaped cross-section, this bar engaging around the upper side of the carrier member with the legs of the U directed downwardly. In this arrangement the projection and receiving means forming the fastening means at the mutually facing ends of the bar-like members are perferably formed respectively by at least one pin projecting from a side surface of the carrier beam and by a recess formed in a leg of the U, starting from an end face, in which recess said pin is received, while the abutment and securing means forming the other fastening means, at the mutually remote ends of the bar-like members, are each formed by an upstanding flange which is formed on the bar-like member, and is provided with an opening, and lies next to a flange formed on the upper face of the carrier beam also provided with an opening, and by a screw means inserted through the coinciding openings in the flanges. The invention will be described more fully below with reference to the example of embodiment shown in the drawing, in which: Figure 1 shows in perspective a scraper device according to the invention, mounted on the frame of a conveyor belt, and figure 2 is a front view of the scraper device shown in figure 1, during a dismantling phase. As shown in the drawing, the scraper device comprises a set of scraper elements 1 and 1′, which are divided into two groups and mounted on two bar-like members 2, 2′ of U-shaped section. Each scraper element 1, 1′ consists of an arm 3, 3′ and a scraper blade 4, 4′ projecting from said arm. Each arm 3, 3′ is swivellably mounted, by means of a rubber torsion spring (not shown) received in a casing 5,5′, between two flanges 6, 6′ provided on the bar-like member 2, 2′. The bar-like members 2, 2′ of U-shaped section rest on a carrier beam 7 of rectangular section, with the legs of the U engaging around the upper side of said carrier beam 7. At the mutually facing ends of the bar-like members 2, 2′ said members are provided with a recess 8, 8′, these recesses being formed in both legs of the U. The carrier beam 7 is provided with projecting pins 9, 9′, which are received by the recesses 8, 8′. At the mutually remote ends of the bar-like members 2, 2′ said members are provided with upstanding flanges 10, 10′ in which openings are formed. These flanges 10, 10′ cooperate with upstanding flanges 11, 11′, which are also provided with openings and which are formed on the carrier beam 7, so that bolts, on which nuts 12, 12′ are screwed, can be passed through the coinciding openings in the pairs of flanges 10, 11; 10′. 11′. The beam 7 is mounted between two sliding sleeves 13, 13′ slidingly engaging around the legs 14, 14′ of the frame of a conveyor belt. The sleeves 13, 13′ are adjustable in height by means of threaded spindles 15, 15′, so that the whole scraper device is adjustable in height, the threaded spindles 15, 15′ being supported at their other ends by the longitudinal members 16′ of the conveyor belt frame. In addition, figure 1 also shows the return roller 17 and the conveyor belt 18 guided around it. By means of the spindles 15, 15′ the carrier beam 7 is moved upwards until the scraper blades 4, 4′ bear resiliently, through the action of the torsion springs received in the casings 5, 5′, against the lower face of the lower run 18′ of the conveyor belt. When the scraper elements 1 have to be removed, for example in order to enable one or more of the scraper blades 4 to be replaced, the nuts 12, 12′ are unscrewed and the bolts are pulled out of the coinciding openings in the pairs of flanges 10, 11; 10′, 11′, whereupon, as shown in figure 2, the bar-like members 2, 2′ can be tipped up and the recesses 8, 8′ then disengaged from the pins 9, 9′, so that the bar-like members 2, 2′, together with the scraper elements 1, 1′ mounted on them, can be removed in a very simple manner from the carrier beam 7, whereupon new bar-like members can be fastened, once again in a simple manner but this time in the reverse sequence, on the carrier beam 7. All possible repair work can then be done in a workshop on the removed scraper elements 1, 1′, whereupon the reconditioned units 1, 2, 3, 4, 5, 6 will again be ready for use.

Claims: Scraper device for an endless conveyor belt (18) said scraper device consisting of a set of scraper elements (1, 1') each of which has a scraper blade (4, 4') and which lie substantially next to one another and are supported by an elongate carrier member (7) which extends transversely of the longitudinal direction of the conveyor belt and is mounted on the frame (14) of the conveyor belt in such a manner that the scraper blades (4, 4') of the scraper elements (1, 1') come to lie with their free edges against the lower face of the lower run of the conveyor belt (18), the scraper elements being mounted on at least one bar-like member (22') which extends parallel to the carrier member and rests on the top of said carrier member (7), and which is fastened to said carrier member by means of detachable fastening means (8-12) which are mounted at the ends of the bar-like member, characterized in that the scraper elements (1, 1') are divided into two groups and mounted on two bar-like members (2, 2') resting on the top of the carrier member (7) and lying in line with and adjacent one another, while said fastening means, at the mutually facing ends of the bar-like members (2, 2'), are formed each by projection and correspondingly mating receiving means (9, 8) which are formed respectively on the carrier member (7) and on the bar-like member (2) in which receiving means (8) said projection means (9) is received in interengaging relationship in such a manner that a displacement of a bar-like member (2) in a direction away from the fastening means (9) formed on the carrier member (7) will enable said projection and receiving means (9, 8) to be slid out of engagement with one another, and the other fastening means at the mutually remote ends of the bar-like members are each formed by abutment and corresponding securing means (10, 11, 12) so that said displacement of a bar-like member is possible only after said securing means (12) has been detached. Scraper device according to claim 1, characterized in that the carrier member is formed by a beam (7) having a rectangular section, and each bar-like member is formed by a bar (2, 2') having a U-shaped crosssection, this bar engaging around the upper side of the carrier beam (7) with the legs of the U directed downwardly. Scraper device according to claims 1 or 2, characterized in that the projection and receiving means forming the fastening means, at the mutually facing ends of the bar-like members are formed, respectively, by at least one pin (9) projecting from a side surface the carrier beam (7) and at least one recess formed in a leg of the bar-like member (2, 2'), starting from an end face, of said bar-like member, in which recess said pin is received. Scraper device according to claims 1 to 3, characterized in that said abutment and securing means forming the other fastening means, at the mutually remote ends of the bar-like members, are each formed by an upstanding flange (10) which is formed on the bar-like member (2, 2'), and is provided with an opening, which lies next to a flange (11) formed on the upper face of the carrier beam also provided with an opening, and by screw means ( 12) inserted through the coinciding openings in the flanges.

Inventors: SLIKKER, DICK
Applicants: HCC-EDE B.V.
Application year: 1987
Main classification: B65G45
IPC codes: B65G45