MXPA98010036A - Assembly of band control to center transported bands - Google Patents

Abstract

The present invention relates to a band control assembly in a conveyor for centering conveyor belts, characterized in that: a control bracket supports at least one control roller for the conveyor belt, control bracket which is rotatably attached to a first fulcrum whose axis extends perpendicularly to the conveyor belt, and wherein, at a distance in the direction of conveyance of the band from the first fulcrum via a first rotary joint, the control bracket is connected to a lever arm on the which extends substantially in the longitudinal direction of the conveyor belt and which, at a distance in the direction of conveyance of the web from the first rotating joint, joins a second fulcrum whose axis extends perpendicularly to the conveyor belt, and a distance in the transport direction of the band from the second fulcrum via a second rotary joint, which is connected to a second guide chamber which supports guide rollers placed to make contact against each of the outer sides of the band, for reaction to a lateral displacement of the conveyor belt, guide bracket which is connected, via a third rotary joint to, a parallel support which extends parallel to the lever arm and extends to a third fulcrum whose axis extends perpendicularly to the conveyor belt, the assembly is characterized in that the ratio between the distance between the first rotary joint and the second fulcrum, and the distance between the second fulcrum and the second rotating joint is between 1: 2 and 1: 5, preferably between 1: 2.5 and 1: 3.5, and more preferably about 1: 3, and wherein the first, second and third fulcrums are adjustable laterally in relation to the longitudinal direction of the conveyor belt, as they are fixed to the conveyor by telescopically movable tubes, for lateral adjustment of a pos neutral ion for the transported belt

Description

ASSEMBLY OF BAND CONTROL TO CENTER TRANSPORTING BANDS DESCRIPTION OF THE INVENTION The invention relates to a band control assembly on a conveyor for centering conveyor belts, wherein: a control bracket supports at least one control roller for the conveyor belt, the control bracket which is rotatably attached to the conveyor belt. a first fulcrum whose axis is divided perpendicularly to the conveyor belt and wherein a distance in the conveying direction of the strip from the first fulcrum via the first rotary joint of the control bracket is connected to a lever arm which extends substantially in the longitudinal direction of the conveyor belt, and which, at a distance in the transport direction of the web from the first rotary joint is joined to a second fulcrum whose axis extends perpendicularly to the conveyor belt, and at a distance the transport direction of the band, from the second fulcrum, via a second rotary joint, which is connected to a second guide rail which supports guide rollers placed to make contact against each of the outer sides of the band, to react, with the lateral displacement of the conveyor belt, guide bracket which is connected with a third rotary joint to a parallel support which extends parallel to the lever arm and extends to a third fulcrum, whose axis extends perpendicularly to the conveyor belt. The use of the band control assembly for controlling a conveyor belt during loading, wherein a laterally adjustable conveyor belt moves past a loading device for loading of a preferably granulated material, and wherein the center of gravity of the loaded material is It is located on the side of the central portion of the conveyor belt when the conveyor belt is located in a neutral position. Belt control assemblies are used, among other things, to guide conveyor belts in processing plants of various types of materials such as granulated ores. DE 174491 discloses a conveyor belt device for correcting poor lateral lineaments which occur during the operation, therefore returning the belt to its normal position. A set of control rollers for the conveyor belt, which plate is rotatably attached to the base, are mounted on a plate. An arm with a transverse support is mounted on the turntable. The arm can be articulated and is rotatable around a joint of rotation which is attached to the base. Cross guides are attached to the transverse support which run along the edge of the conveyor belt, and which, in the case of poor lateral alignment of the belt, transfer the displacement to the transverse support. This displacement is transferred to the lever arm, which in turn transfers the displacement to the plate with the result that the axes of the control rollers tilt, thus returning the conveyor belt to its normal position. In document NO 178 853 a band control assembly of a similar type is described, but wherein the lever arm is rotatably joined both to the plate, which retains the control rollers, as well as to a transverse support which Hold the guide rollers. The control lever is rotatably attached to a fixed point located at a distance from the fasteners on the plate and the transverse support, and a parallel rotatable support is mounted, parallel to the lever arm, always the transverse support and a fixed base in the form of beam, with the result that the transverse support always remains supported at right angles to the center line of the conveyor belt. Norwegian patent application DE 962268 describes a reversible band assembly in which the actual control function is implemented in the same way as document NO 178853, but where there are two sets of guide rollers placed on opposite sides of the control rollers, and wherein the guide rollers can be connected and disconnected in relation to the control rollers by means of a switching mechanism, based on the direction of travel of the band. The known band control assemblies of the type which is described in DE 174491 and similar types have a tendency to cause deviations and misalignments of the conveyor belt, especially when there is an irregular load or an uneven weight distribution, so that cause wear along the edges of the band.

In comparison with these other known band control assemblies, the band control assembly which is described in document NO 178 853 provides a more regular movement of the conveyor belt and consequently less wear and a longer working time. The control of the conveyor belt with a belt control assembly as described in document NO 178 853, however, is not free of problems, since both lack of control and over-control can occur, with consequent irregular operation . When the conveyor belts are used to move materials within the processing industry, such as the movement of granulated veins, an uneven load on the belt results in the material being placed outside the central portion of the belt, which is a common problem Of course, the problem can be solved by moving the loading apparatus or the foundations of the conveyor belt, but both measures require a very radical invention and consequently are not desirable. The object of the invention is to provide a band control assembly for centering conveyor belts of the type which is described in document NO 178 853, but where control of the belt is performed without lack of control or over-control. A further object of the invention is to provide a method for loading onto a conveyor belt in order to avoid uneven loading. These objects are obtained according to the invention with a band control assembly and a method of the type mentioned in the introduction, characterized in that the definitions are indicated in the claims. The band control assembly according to the invention is based on document NO 178 853 and constitutes a further development thereof. This additional development is based on the fact that the surprising discovery has been made that the specific geometrical factors associated with the band control assembly are of crucial importance for the operation of the band control assembly. These geometrical factors are not associated with dimensioning or optimization, but rather are associated with the exchange rates when transferring movement from the guide rollers to the control rollers. With a design of the band control assembly according to the invention, a hitherto unknown stability is obtained in the band. By means of the interaction between the different parts of the band control assembly, the poor lateral alignments of the conveyor belt are amplified by means of laterally directed displacements of the guide rollers and transferred to the control rollers which rotate exactly in the correct amount to return the conveyor belt to its central position. This also allows the band to adjust in the lateral direction without affecting stability. The method according to the invention becomes possible due to the fact that the band control assembly according to the invention allows a precise and regular adjustment of the conveyor belt. The invention will now be described in greater detail in connection with a description of a specific embodiment and with reference to the drawing, in which: Figure 1 is a view of the lower part of a band control assembly, in accordance with the invention, Figure 2 is a sectional elevation view of the band control assembly of Figure 1, Figure 3 is a perspective view of the band control assembly according to the invention, Figure 4 is a cross section through the conveyor belt where the loaded material falls out of the central portion of the conveyor belt, Figure 5 is a top view of the conveyor belt when loading is performed according to the invention, and Figure 6 is a elevation in section of a conveyor belt where the load is made according to the invention. The same reference numbers are used for corresponding parts in all figures. Figures 1 and 2 illustrate a band control assembly according to the invention. A control bracket 2 supports two control rollers 1 to control the conveyor belt 5 when traveling in its transport direction Pl, which coincides with the longitudinal direction of the band. The control bracket 2 is rotatably joined at a first fulcrum 4, which is located on a beam 11 which extends between the side members 10 on the side of the band control assembly. The control bracket 2 is connected to a lever arm 6 by means of a first joint 17 rotating at a distance in the band transport direction Pl from the first fulcrum 4.

The lever arm 6 extends in the longitudinal direction of the conveyor belt, and at a distance B in the transport direction Pl of the band from the first rotary joint 17 which joins a second fulcrum 18 which is located on a beam 19 between the side 10 members. At an additional distance c in the conveying direction of the band from the second fulcrum 18 of the lever arm 6 are connected, by means of a second rotary joint 8 to a guide bracket 7. The guide bracket 7 supports the guide rollers 9 placed to make contact against each of the outer sides of the band 5, to react to a lateral displacement of the conveyor belt in the direction P2. A parallel support 13 extends parallel to the lever arm 6 and is joined to one end of the guide bracket 7 by a third rotating joint 14 and the other end is joined to a third fulcrum 20 on the beam 19. Both the first, second and third fulcrums, as well as the first, second and third rotating joints have axes which extend perpendicularly to the conveyor belt. In the illustrated embodiment, the length of the parallel support 13 is equal to the distance c between the second fulcrum 18 and - lu the second rotary joint 8, and the third fulcrum 20 is located in relation to the longitudinal direction of the conveyor belt in the same transverse plane as the second fulcrum 18. The distance between the rotary joints 8 and 14 is equal to the distance between fulcrums 18 and 20, and in this way a parallelogram defined by the lines between points 18, 8, 14 is formed and 20. A displacement of the guide bracket 7 with the guide rollers 9 in this manner will always extend perpendicularly in the longitudinal direction of the conveyor belt. The conveyor belt and belt control assembly are illustrated in Figure 1 in its neutral position, ie, a position in which the first and second fulcrums, 4, 18 and the first and second rotary joints 17, 8, they locate substantially along the center line of the conveyor belt and the belt is not subjected to any laterally directed correction of the belt control assembly. A lateral displacement of the conveyor belt in the direction P2 of the neutral position will be transferred to the guide rollers 9 and on the guide bracket 7, and then on the lever arm 6, the control bracket 2 and the rollers 1 of control, the - li will guide the band 5 cotransporter back to the neutral position. According to the invention, the ratio between the distance b between the first rotary joint 17 and the second fulcrum 18, and the distance c between the second fulcrum 18 and the second rotary joint 8 must be between 1: 2 and 1: 5, preferably between 1: 2.5 and 1: 3.5, and most preferably at about 1: 3. When this condition is satisfied, a high degree of stability is obtained in the band control assembly. Even minimal lateral misalignments of the conveyor belt are amplified by the length ratio in the lever arm 6 and transferred to the support rollers 1 which are rotated exactly to the correct amount to return the conveyor belt to its neutral position . If the aforementioned ratio is greater than 1: 2, the control of the conveyor belt lacks control, i.e., the movement which is transferred from the guide rollers 9 to the control rollers 1, in the case of a wrong lateral alignment of the conveyor belt, is not large enough to rotate the control rollers enough to re-adjust the conveyor belt to a neutral position. If the aforementioned ratio is less than 1: 5, the control of the conveyor belt presents excess control, that is, the movement which is transferred from the guide rollers 9 to the control rollers 1 in the case of a wrong Lateral alignment of the conveyor belt will rotate the control rollers too much, so they cause the conveyor belt to adjust beyond the neutral position and in the opposite direction. This results in oscillation. In the embodiment illustrated in FIGS. 1 and 2, the distance a between the first fulcrum 4 and the first rotatable joint 17 is equal to the distance b between the first rotary joint 17 and the second fulcrum 18. This is related to the ratio between the distances b and c, and an alteration of the ratio between a and b will affect the possibilities of adjustment of the band control device, sensitivity and stability, and will also affect the preferred ratio between b AND c. In the embodiment in figure 1, the control rollers are additionally mounted on a common axis which extends parallel with the band 5, through the longitudinal direction of the band. In addition, the shaft through the first fulcrum 4 crosses the extension of axis 1 of the control rollers. This is a preferred embodiment for a level band, but, of course, numerous variants are possible, and these will be exemplified in relation to figure 4. It is also obvious that a change in geometry relative to the axes of the control rollers and the position of the first fulcrum will also affect the preferred ratio between b and c. The embodiment illustrated in FIGS. 1 and 2 is what is referred to as control at the top, ie, a band control which is located above the side members 10 and is designed to control the conveyor belt when it is moved. in your transportation address on top of a post. Figure 3 illustrates what is referred to as control at the bottom, that is, a band control which is located below the side members 10 and is used to control the conveyor belt when moving in a return direction in the lower side of the post. The control in the lower part in figure 3 has the same design principle as the control in the upper part in figures 1 and 2, but the design is slightly different when considering the joint in the lateral members. The control rollers 1 are not shown. The designations "with control at the bottom" and "with control at the top" should not be confused with "lack of control" and "over-control" discussed above. Figure 3 further illustrates how the beams 11 and 19 are positioned to be adjustable laterally by means of square tubes that move telescopically. The first, second and third fulcrums, indicated by the numbers 4, 18 and 20 respectively, are thus adjustable laterally in relation to the longitudinal direction of the conveyor belt. In this way the possibility is provided for lateral adjustment of the neutral position of the conveyor belt. The dimensions of the band control assembly can be adjusted by means of telescopically movable square tubes in such a way that they can be assembled together with the most commonly used conveyor belts. In this way, the band control assembly also utilizes existing support rollers as control rollers, which may be of different dimensions in the various fields. This denotes an economic advantage compared to the known designs of band controls.

Figure 3 further illustrates how the guide bracket 7 is positioned to be laterally adjustable by means of telescopically movable square tubes, therefore allowing the clearance between the guide rollers 9 and the outer edges from the band 5 to be adjusted . In the preferred embodiment, this clearance in the neutral position is between 1 and 10 mm, preferably between 3 and 8 mm, and more preferably 5-6 mm. It has been found that the preferred free spaces mentioned above provide a better relationship between a low level of wear on the sides of the conveyor belt and a continuous adjustment of the conveyor belt. Even the small lateral movements of the band will be transferred to the control rollers and this constant adjustment will generate a rhythmic movement of the band control assembly which avoids the deposit of random materials, or possibly the formation of ice on the moving parts. of the band control assembly. Figure 4 is a cross section through a curved conveyor belt 5 which rests on inclined control rollers 1. As the rigidity and elasticity of the band changes with time, the band will become more and more curved with the same load. The height and spacing of the guide rollers 9 can be adjusted at regular intervals to ensure that the guide rollers 9 always follow the edge of the strip 5. The band in Figure 4 is located in its neutral position, and a load is added in the form of a granulated material 15 on the side of the central section 12 of the conveyor belt, which is highly undesirable as this leads to an uneven load and increased wear of the conveyor belt. Figure 5 is a top view of a laterally adjustable conveyor belt 5, which moves past a loading device 16 for loading of a granulated material 15 by means of the method according to the invention. Before loading the conveyor belt 5, it is laterally controlled to a position where the center of gravity of the loaded material is in the central section of the conveyor belt and after loading the conveyor belt is guided laterally to its neutral position. In this way, the belt acquires a more regular operation and is less subject to wear.

In the embodiment illustrated in Figure 5, laterally directed control of the conveyor belt is performed with belt controllers, when a belt controller with guide rollers 9 is placed in the front of the loading device 16 in order to control the conveyor belt out of its neutral position, and a band controller with guide rollers 9 'is placed behind the loading device in order to control the conveyor belt back to its neutral position. Figure 6 illustrates a preferred embodiment of the method according to the invention, wherein the conveyor belt 5 is located in a station 21 with one side of the conveyor for material at the top of the station, and a return side for the conveyor belt. the lower side of the post. The conveyor belt 5 is guided by means of the support rollers 22 and the drive devices not shown from the underside of the upper part, as illustrated by the arrows P3 and P4. A loading device 16 is placed at the end of the station for loading material 15 on the belt immediately after it has moved on its underside to the top of the station.

When the method in Figure 6 is implemented, the laterally directed control of the conveyor belt 5 prior to loading is performed with a control in the lower part, on the underside of the station, attached to the lower side members 10. Similarly, the laterally directed control of the conveyor belt after loading is performed with a control on the upper part, on top of the station, attached to the upper side members 10. By means of the band control assembly according to the invention, when the advantageous mechanism for transferring movement from the guide rollers to the control rollers is combined with the laterally adjustable adjustability on the neutral position of the conveyor belt, the possibility of carrying out the method according to the invention. Therefore, there is a clear and logical connection between the band control assembly and the method according to the invention. The invention has been explained in the foregoing with reference to a specific embodiment. However, it is obvious that numerous variations of the invention are possible, especially associated with the geometry of the band control assemblies.

Therefore, it should be understood that the band control assembly wherein the relative positions of the junction points and the rotary joints are displaced to some extent in the horizontal and / or vertical plane relative to the band control assembly described also they are within the scope of the invention as defined in the claims.

Claims (7)

1. A band control assembly in a conveyor for centering conveyor belts, characterized in that: a control bracket supports at least one control roller for the conveyor belt, control bracket which is rotatably joined to a first fulcrum whose axis is extends perpendicularly to the conveyor belt, and wherein, at a distance in the direction of conveyance of the web from the first fulcrum via a first rotary joint, the control bracket is connected to a lever arm which extends substantially in the longitudinal direction of the conveyor belt and which, at a distance in the transport direction of the web from the first rotary joint, joins a second fulcrum whose axis extends perpendicularly to the conveyor belt, and at a distance in the direction of conveyance of the band from the second fulcrum via a second rotary joint, which is connected to a guide bracket which supports guide rollers placed to make contact against each of the outer sides of the band, for reaction to a lateral displacement of the conveyor belt, guide bracket which is connected, via a third rotary joint to, a parallel support which is extends parallel to the lever arm and extends to a third fulcrum whose axis extends perpendicular to the conveyor belt, the assembly is characterized in that the ratio between the distance between the first rotary joint and the second fulcrum, and the distance between the second fulcrum and the second rotating joint is between 1: 2 and 1: 5, preferably between 1: 2.5 and 1: 3.5, and more preferably of about 1: 3, and wherein the first, second and third fulcrums are laterally adjustable in relation to the longitudinal direction of the conveyor belt, being fixed to the conveyor by telescopically movable tubes, for lateral adjustment of a neutral position for the belt transporter

2. The band control assembly, according to claim 1, characterized in that the control rollers are mounted around axes which extend substantially through the longitudinal direction of the strips and where the axle through the first fulcrum crosses or substantially crosses the extension of the axes of rotation of the control rollers.

3. The band control assembly according to one of the preceding claims, characterized in that the distance between the first fulcrum and the first rotary joint is equal to or substantially equal to the distance between the first rotary joint and the second fulcrum.

4. The band control assembly, according to one of the preceding claims, characterized in that the length of the parallel support is equal to or substantially equal to the distance between the second fulcrum and the second rotating joint, and wherein the third fulcrum in relation to the longitudinal direction of the conveyor belt is located in the same or substantially in the same transverse plane as the second fulcrum.

5. The band control assembly, according to one of the preceding claims, characterized in that the guide rollers are positioned to be laterally adjustable, for example by means of telescopic tubes, and wherein the guide rollers are placed to make contact against each of the outer sides of the band with a free space which, in the neutral position, measures between 1 and 10 mm, preferably between 3 and 8 mm, and more preferably 5-6 mm.

6. The use of a band control assembly, according to one of the preceding claims, for controlling a conveyor belt during loading, wherein a laterally adjustable conveyor belt moves past a loading device, for loading a material preferably granulate, and where the center of gravity of the loading material is on the side of the central portion of the conveyor belt when the conveyor belt is located in a neutral position, the use is characterized in that prior to the loading of the conveyor belt it is laterally controlled by a first belt control assembly to a position where the center of gravity of the loaded material is on the central portion of the conveyor belt, and after the loaded, the conveyor belt is controlled laterally by a second band control assembly to its neutral position.

7. The use of band control assembly, according to claim 6, characterized in that the conveyor belt is placed in a station with a transport side for the material in the upper part of the station, and a return side for the conveyor in the station. the underside of the station, and where the loading is performed on the transport side of the band at the end of the station when the band moves from the lower side to the upper part of the station, the use is characterized in that, prior to loading, laterally directed control of the conveyor belt is performed with a belt control assembly on the underside of the stand and, after loading, laterally directed control of the conveyor belt is carried out with a band control assembly at the top of the stand.