JP4280059B2 - belt conveyor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a belt conveyor. More specifically, the present invention relates to a belt conveyor that includes a belt that is moved in the longitudinal direction thereof and that conveys an object loaded on the belt.
[0002]
[Prior art]
A belt conveyor installed outdoors may collect rainwater on the belt. This is especially true for belt conveyors in which the belt is supported by troughs or carrier rollers so that the center of the cross section is recessed. Some materials to be transported, such as coal, clay, limestone, and gypsum, are inconvenient to absorb this rainwater. Further, if the belt is a belt conveyor that is inclined upward in the conveyance direction, if rainwater accumulates on the belt, the object to be conveyed slips on the belt and may not be efficiently conveyed.
[0003]
In order to solve such a problem, a drainer for discharging water on the belt has been proposed (see, for example, Patent Document 1). This draining device includes a draining roller for pressing the belt downward from above. When the draining roller presses the belt, a large number of carrier rollers arranged in the longitudinal direction of the belt are moved upstream and downstream in the traveling direction of the belt and are retracted from the vicinity of the descending path of the draining roller. And the vicinity of the belt pressed by the draining roller is pushed downward, and water spills out from both sides of the belt.
[0004]
[Patent Document 1]
JP-A-9-202428 (paragraph [0016], FIG. 2 and FIG. 3)
[0005]
[Problems to be solved by the invention]
However, this draining device requires a device for moving a large number of carrier rollers that support the belt from below, to the upstream side and downstream side of the belt, and of course, it is necessary to configure many carrier rollers to be movable. is there. Furthermore, it is necessary to provide a draining roller that can be raised and lowered. Overall, the equipment becomes large, equipment costs increase, and maintenance targets also increase.
[0006]
The present invention has been made to solve such a problem, and it is possible to effectively remove the water on the belt by utilizing the weight of the belt and the water accumulated on the belt without requiring a special and large-scale device. An object of the present invention is to provide a belt conveyor that can be drained.
[0007]
[Means for Solving the Problems]
The belt conveyor of the present invention is
A gantry, a belt for conveyance, a carrier roller that supports the belt from below so that the central portion of the cross section of the belt is recessed, and a displacement roller that is at least a part of the carrier roller A displacement roller lowering device for displacing downward.
[0008]
According to such a belt conveyor, since the carrier roller to be displaced, that is, the displacement roller is displaced downward, the lower support of the portion of the belt is substantially released, so that the belt becomes horizontal in the width direction. Also, when the belt tension is low, the belt lowers accordingly. Therefore, water accumulated on the belt when the belt is operated is discharged from that portion.
[0009]
Adjacent to the displacement roller, central pressing portion for pushing upward the central portion of the cross section of the belt from a relatively lower is arranged when the displacement roller is displaced downward. Therefore, since the water on the belt tends to flow out from both sides of the belt by pushing up the center in the width direction of the belt from below, drainage Ru is more effectively done.
[0010]
Then, the displacement roller lowering device, and a drive mechanism for the displacement roller is driven and the movable support frame rotatably mounted, the movable support frame to displace the roller is displaced downward. Thus, the carrier roller (displacement roller) is present is a member for supporting it, the lowering of the displacement rollers that Do facilitates simplification of the structure by moving the member as a movable. This movable support frame displacement mechanism can be provided with, for example, a guide rail or a lifting device to move the movable support frame up and down with respect to the gantry, or can tilt the movable support frame with respect to the gantry as will be described later. Can be achieved by attaching to.
[0011]
An intermediate portion of the movable support frame is pivotally supported by the gantry, and is configured to be rotatable about the pivot point. The drive mechanism includes a displacement roller sandwiching the pivot point of the movable support frame. A belt conveyor configured to push and pull the drive unit located on the side opposite to the attachment unit is preferable. This is because the displacement roller on the opposite side of the pivot point is rotated by pushing and pulling the driving portion of the movable support frame, so that the vertical displacement of the displacement roller can be realized with a simple structure.
[0012]
A plurality of the movable support frames are attached at intervals along the moving direction of the belt, and the drive mechanism connects the drive parts of the movable support frame to each other, and the drive pushes and pulls the connection parts. A belt conveyor comprising the device is preferred. By lowering a plurality of displacement rollers along the belt moving direction, the width direction of the belt in a wide range in the longitudinal direction can be leveled or the belt can be lowered downward, so that drainage is performed quickly and efficiently. Because.
[0013]
The central pressing portion protrudes below the displacement roller mounting portion in the movable support frame, and the central pressing portion is displaced upward as the movable support frame tilts to displace the displacement roller downward. It is configured. Therefore, displacement in conjunction with the displacement of the roller positively displaces the central pressing portion upward can push up the central portion of the belt, moreover Ru can be achieved by a simple configuration such action.
[0014]
Moreover, the said center press part can be comprised from the roller extended in the width direction of a belt. In this case, the water can be smoothly drained while the belt is advanced.
[0015]
Or the said center press part can also be comprised from the roller extended in the width direction of a belt in the range corresponding to the center part of the cross section of a belt. In this case, since both side portions in the width direction of the belt are lowered from the central portion, effective drainage is possible.
[0016]
The roller constituting the central pressing portion can have a shape in which the outer diameter gradually increases from both longitudinal end portions toward the center. Also in this case, since both side portions in the width direction of the belt are lowered from the central portion, effective drainage is possible.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of a belt conveyor of the present invention will be described with reference to the accompanying drawings.
[0018]
FIG. 1 is a front view showing a main part of one embodiment of a belt conveyor of the present invention. FIG. 2 is a front view of a principal part showing a state when water on the belt conveyor of FIG. 1 is drained. FIG. 3 is a side view showing a state of the carrier roller and the belt in FIGS. 1 and 2.
[0019]
1-3 includes a plurality of carrier rollers 3 that support the forward side of the endless belt 2 from below. Further, tension is applied to the belt 2 by an end pulley (not shown) and a tension pulley (not shown) between the upstream end and the downstream end. In the figure, reference numeral 2a denotes a return side belt. As shown in FIG. 3, the carrier roller 3 is composed of a single middle roller 4 and a pair of side rollers 5 that are inclined upward on both sides thereof. The belt 2 is supported from below by these rollers 4 and 5 so that the central portion in the width direction is recessed as shown in the figure. Each roller 4 and 5 is rotatably attached to the upper end of the support member 6. The support member 6 is attached to a gantry 7 so as to extend vertically on both sides of the belt 2. The plurality of support members 6 are arranged at predetermined intervals in the longitudinal direction of the belt 2. An arrow F in the figure indicates the traveling direction of the forward side belt 2.
[0020]
Part of the plurality of support members 6 (two in this embodiment) is pivotally supported by the gantry 7. This rotatable support member is called a movable support frame 8, and the support members 6 other than the movable support frame 8 are called fixed support members 6. The movable support frame 8 is different from the fixed support member 6 in the attachment method to the gantry 7 and the structure of the lower end portion. The fixed support member 6 is fixed to the gantry 7, but the movable support frame 8 is pivotally supported by the gantry 7 so as to be tiltable in the longitudinal direction of the belt 2 from an upright state. A drive mechanism 9 for tilting the movable support frame 8 is connected to the lower end of the movable support frame 8. It can be said that the carrier roller 3 attached to the upper end of the movable support frame 8 is a displacement roller. The movable support frame 8 and the drive mechanism 9 can be called a displacement roller lowering device.
[0021]
The drive mechanism 9 includes a connecting rod 10 that rotatably connects the lower ends of the movable support frame 8, and a drive cylinder 11 in which the end of the rod 11 a is connected to the end of the connecting rod 10. The portion of the movable support frame 8 to which the connecting rod 10 is rotatably connected can be said to be a drive unit of the movable support frame 8. The drive cylinder 11 is swingably attached to the holding table 12. Then, when the drive cylinder 11 extends the rod 11a, the movable support frame 8 becomes upright, and the carrier roller 3 supports the belt 2 from below (FIG. 1). Further, when the drive cylinder 11 contracts the rod 11a, the movable support frame 8 is tilted with the pivot point P as a fulcrum (FIG. 2), and as a result, the carrier roller 3 is lowered to release the support of the belt 2. As a result, as shown by a two-dot chain line in FIG. 3, both sides of the belt 2 are not supported by the side rollers 5, so that the belt 2 changes its shape in the width direction from a concave shape to a horizontal state due to tension. Further, this portion of the belt 2 is lowered below the upstream and downstream portions due to its own weight and the weight of water. The water on the belt spills downward from both sides of the belt 2. In this way, draining (drainage) is performed. According to this configuration, draining is performed by the weight of water or the belt, so that the configuration of the draining mechanism (drainage mechanism) is simplified.
[0022]
The drive mechanism is not limited to the drive cylinder, and other known drive devices may be used. Further, the movable support frame 8 is tilted to the left in the drawing as shown in FIG. 2, but is not limited to this. For example, if the traveling direction of the belt is from right to left in the figure, it may be tilted only in the right direction. This is because the movable support frame 8 also needs to support a lateral load accompanying the progress of the belt.
[0023]
A stopper 13 is fixed to the gantry 7 at a position on the side opposite to the tilting direction with respect to the movable support frame 8 and close to the upright movable support frame 8. The stopper 13 is made of so-called L-shaped steel or the like, and is fixed to the upper surface of the gantry 7. The stopper 13 is positioned at the upright position by contacting the movable support frame 8 when the drive cylinder returns the movable support frame 8 from its tilted state to the upright state. The stopper 13 also has an effect of supporting a load in the belt traveling direction that acts on the movable support frame 8 by the belt 2 during operation of the belt 2.
[0024]
In the above embodiment, the two movable support frames 8 are continuously arranged, but the number of the movable support frames 8 is not limited. There may be one movable support frame as required. When the tension of the belt is large, the belt 2 can be easily lowered by increasing the number of movable rollers. At that time, three or more movable support frames 8 may be provided. Further, the movable support frames are not continuously collected and arranged in only one place in the entire belt conveyor 1, but are arranged in a plurality of places between the fixed support members 6 if necessary. You may make it drain from multiple places in a direction. However, when draining while advancing the belt, the water on the belt is transported to the position of the movable support frame 8, so the movable support frame 8 may be installed in one place, which is preferable because it reduces the cost. .
[0025]
Moreover, although it is the structure which moves a displacement roller below by tilting the movable support frame 8 in the said embodiment, it is not limited to this structure. For example, the movable support frame may be configured to be movable up and down by a drive cylinder or the like oriented in the vertical direction, and the frame 7 may be provided with a guide rail for guiding the vertical movement of the movable support frame. With this configuration, the movable support frame can be lowered to release the belt support of the displacement roller. At this time, a detachable stopper may be provided below the movable support frame so as to raise the movable support frame to a position where the displacement roller supports the belt and hold the movable support frame at the position.
[0026]
4 to 8 show a belt conveyor 21 according to another embodiment. FIG. 4 is a front view showing the main part of the belt conveyor 21. FIG. 5 is a main part front view showing a state when water on the belt conveyor 21 is drained. 6 is a sectional view taken along line IV-IV in FIG. 4, and FIG. 7 is a sectional view taken along line IIV-IIV in FIG.
[0027]
The belt conveyor 21 is supported from below by a carrier roller 23 so that the belt 2 is recessed in the center in the width direction (see FIG. 6). However, as will be described later, the movable support frame 8 (see FIG. 1 to FIG. 3) is provided with a movable support frame 22 having a different structure. Similarly to the carrier roller 3 (FIG. 3), the carrier roller 23 is also composed of a single middle roller 30 and a pair of side rollers 31 that are inclined upward on both sides (see FIGS. 6 and 6). (See FIG. 7).
[0028]
As shown in FIGS. 4 and 5, the belt conveyor 21 includes four movable support frames 22, but of course, the number is not limited to this. The movable support frame 22 is pivotally supported on the gantry 25 like the one in FIG. 1, and the fixed support member 24 is fixed to the gantry 25. The movable support frame 22 is tilted by a drive mechanism 26 using the drive cylinder 11.
[0029]
The drive mechanism 26 includes a connecting rod 27 that rotatably connects the lower ends of the movable support frame 22, and a drive cylinder 11 in which the tip of the rod 11 a is connected to the end of the connecting rod 27. When the drive cylinder 11 extends the rod 11a, the movable support frame 22 becomes upright, and the carrier roller 23 supports the belt 2 from below (FIGS. 4 and 6). Further, when the drive cylinder 11 contracts the rod 11a, the movable support frame 22 is tilted with the pivot point P as a fulcrum (FIG. 5). As a result, the carrier roller 3 is lowered to release the support of the belt 2 (FIG. 7). ). The above point is the same configuration as the movable support frame 8 and the drive mechanism 9 of FIG.
[0030]
However, although the drive cylinder 11 is attached to the mount 25, it is not necessary to attach the drive cylinder 11 so as to be able to swing. This is because a long hole 28 is formed in the longitudinal direction at the lower end of the movable support frame 22 so as to be connected to the connecting rod 27, and a connecting pin 29 of the connecting rod is engaged with each long hole 28. Because it is. With this structure, when the rod 11a of the drive cylinder 11 is expanded and contracted, the movable support frame 22 tilts, but the connecting rod 27 does not need to move up and down, and the connecting pin 29 only moves within the long hole 28. Therefore, the drive cylinder 11 does not need to be swingably attached. It can be said that the long hole 28 with which the connecting pin 29 engages is a drive portion of the movable support frame 22. Of course, the drive mechanism 9 having the structure shown in FIGS. 1 and 2 may be used. Furthermore, the structure 26 shown in FIGS. 4 and 5 may be adopted as the drive mechanism of FIGS.
[0031]
The movable support frame 22 of the belt conveyor 21 is different in structure from the movable support frame 8 shown in FIGS. As is apparent from FIG. 8 as well, the movable support frame 22 includes a central pressing roller 32 that presses the central portion in the width direction of the belt 2 from below, in addition to the middle roller 30 and the pair of side rollers 31. Is attached. The movable support frame 22 is arranged on both sides of the belt 2 and is supported by the vertical frame member 33 pivotally supported by the gantry 25 and the vertical frame member 33 above the pivot point P of the vertical frame member 33. A beam 34 and a pair of first brackets 35 projecting upward from the support beam 34 are provided. The middle roller 30 is rotatably mounted between the first brackets 35, and the side rollers 31 are rotatably mounted between the first brackets 35 and the upper ends of the vertical frame members 33. A pair of second brackets 36 project from the support beam 34 in a direction substantially perpendicular to the surface formed by the middle roller 30 and the side roller 31. The second bracket 36 protrudes from the surface of the support beam 34 opposite to the tilting direction of the movable support frame 22 (right side in FIG. 4). The central pressing roller 32 is rotatably mounted between the pair of second brackets 36. The length of the central pressing roller 32 is substantially the same as the length of the middle roller 30.
[0032]
When the movable support frame 22 having such a structure is tilted so that the displacement roller 23 is lowered, the central pressing roller 32 is displaced upward (see FIGS. 5 and 7). As a result, the support of the displacement roller 23 is released, the belt 2 that has become horizontal in the width direction and descends due to gravity is pressed upward by the central pressing roller 32. Accordingly, when the width direction of this portion of the belt 2 is viewed, both side portions are at least lower than the center, so that the water on the belt is effectively drained from both sides. Reference numeral 37 in FIGS. 4 and 5 is a protective bellows attached to the rod 11a of the drive cylinder.
[0033]
In the present embodiment, the central pressing roller 32 has substantially the same length as the middle roller 30, but is not limited to this configuration. For example, the distance between the end portions of both side rollers 31 in a plan view, that is, the width dimension of the belt may be set. In this case, it is preferable to have a shape in which the outer diameter gradually increases from both ends of the central pressing roller 32 toward the center, that is, a crowned shape or a drum drum shape. By doing so, both sides of the belt 2 pressed by the center pressing roller 32 become lower than the center in the width direction, so that the water on the belt is effectively drained from both sides.
[0034]
In the present embodiment, the central pressing roller 32 protrudes substantially perpendicular to the surface formed by the middle roller 30 and the side roller 31, that is, in the illustrated form, perpendicularly to the vertical frame member 33 of the movable support frame 22. In particular, it is not limited to vertical. It may be slightly inclined from the vertical. In short, it is only necessary that the central pressing roller pushes up the central portion of the belt when the movable support frame 22 tilts and the displacement roller releases the support of the belt.
[0035]
Further, instead of the movable support frame 22 configured to be tiltable, a movable support frame configured to be movable up and down by a drive cylinder or the like on the guide rail laid in the vertical direction as described above may be employed. . In this case, a central pressing member may be fixed to the frame adjacent to the movable support frame that can be moved up and down. And the upper end of this center press member is set to the height position substantially the same as the middle roller in the raised position. Then, even if the movable support frame is lowered and the belt support by the displacement roller is released, the upper end of the central pressing member relatively pushes up the central portion in the width direction of the belt.
[0036]
【The invention's effect】
According to the belt conveyor of the present invention, it is possible to effectively drain the water on the belt by utilizing the weight of the belt and the water accumulated on the belt without requiring a special and large-scale device. Become.
[Brief description of the drawings]
FIG. 1 is a front view showing a main part of an embodiment of a belt conveyor according to the present invention.
FIG. 2 is a front view of a main part showing a state when water on the belt conveyor of FIG. 1 is drained.
3 is a side view showing a state of a carrier roller and a belt in FIGS. 1 and 2. FIG.
FIG. 4 is a front view showing a main part of another embodiment of the belt conveyor of the present invention.
5 is a main part front view showing a state when water on the belt conveyor of FIG. 4 is drained. FIG.
6 is a view taken along the line IV-IV in FIG. 4;
7 is a sectional view taken along line IIV-IIV in FIG.
8 is a perspective view showing a movable support frame in the belt conveyor of FIG. 4; FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Belt conveyor 2 Belt 3 Carrier roller 4 Middle roller 5 Side roller 6 Support member 7 Stand 8 Movable support frame 9 Drive mechanism 10 Connecting rod 11 Drive cylinder 12 Holding stand 13 Stopper 21 Belt conveyor 22 Movable support frame 23 Carrier roller 24 Fixed support Member 25 gantry 26 drive mechanism 27 connecting rod 28 long hole 29 connecting pin 30 middle roller 31 side roller 32 central pressing roller 33 vertical frame member 34 support beam 35 first bracket 36 second bracket 37 bellows P pivot point

Claims (7)

A frame,
A conveyor belt;
A carrier roller for supporting the belt from below such that the central portion of the cross section of the belt is recessed.
A displacement roller lowering device for displacing a displacement roller that is at least a part of the carrier roller downward ;
The displacement roller rises by being displaced downward, and includes a central pressing portion that relatively pushes the central portion of the cross section of the belt upward from below .
The displacement roller lowering device has a movable support frame to which the displacement roller is rotatably mounted, and a drive mechanism that tilts the movable support frame so that the displacement roller is displaced downward.
The central pressing portion projects downward from the displacement roller mounting portion in the movable support frame, and is configured to displace upward as the movable support frame tilts to displace the displacement roller downward. belt conveyor. An intermediate portion of the movable support frame is pivotally supported by the gantry, and is configured to be rotatable around the pivot point.
The drive mechanism of claim 1, wherein the belt conveyor comprising configured to push and pull the drive unit located on the opposite side of the mounting portion of the displacement roller across the pivot point of the movable support frame. 3. The center pressing portion is formed by projecting in a direction opposite to the downward displacement tilt direction of the movable support frame at a portion of the movable support frame between the pivot point and the mounting portion of the displacement roller. Belt conveyor. A plurality of the movable support frames are attached at intervals along the moving direction of the belt,
The belt conveyor according to claim 2 or 3 , wherein the driving mechanism includes a connecting member that connects the driving portions of the movable support frame, and a driving device that pushes and pulls the connecting portion. The belt conveyor according to any one of claims 1 to 4, wherein the central pressing portion is configured by a roller extending in a width direction of the belt. The belt conveyor according to any one of claims 1 to 4, wherein the central pressing portion is configured by a roller extending in a width direction of the belt in a range corresponding to a central portion of a cross section of the belt. The belt conveyor according to claim 5 , wherein the roller constituting the central pressing portion is configured such that the outer diameter gradually increases from both longitudinal end portions toward the center.

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