JP7699795B2 - Device for preventing belt lifting and meandering in belt conveyors - Google Patents

Description

This invention relates to a device that follows the belt of a belt conveyor to prevent the belt from lifting up and suppresses the belt's meandering (eliminating dropped loads due to meandering).

In belt conveyor equipment, when transferring to the next line, the head pulley or a pulley equivalent to it (such as a tripper unit with a means for switching the conveying path in the middle) raises the pulley to switch paths, causing the conveyor belt to tilt significantly and eventually float up while making an arc with the horizontal part.

In many cases, the conveyor frame is designed to fit this raised belt, and the rollers are positioned accordingly.

However, even if the belt is in contact with the rollers under load, the belt may lift up when there is no load, or if the amount of transported goods (load weight on the carrier side) changes frequently (due to an interruption in the supply of transported goods, for example).
Also, there are cases where the belt does not come into contact with the rollers as planned.

As a result, methods for holding down the belt on the carrier side to prevent it from lifting up are known, such as a method in which the belt is held down by both sides of the top surface and by wheels on the left and right (Patent Document 1) and a method in which the belt is held down by a roller with a horizontal rotating shaft (Patent Document 2).

JP 2019-194114 A Utility Model Registration No. 3215812

According to the method disclosed in Patent Document 1, the upper side edges of the carrier belt are pressed down by left and right rotating wheels to prevent the belt from lifting up, while according to the method disclosed in Patent Document 2, a single horizontal roller that crosses over the carrier belt prevents the belt from lifting up.

However, neither method is foolproof, and depending on the height and position of the belt at which the pressure wheels or rollers are placed, there is the problem that the pressure wheels or rollers may interfere with the transported goods, causing them to fall off.

We also considered adjusting the level according to the load passing through, but there was no way to adequately deal with the change in the belt position when it was loaded and unloaded, and the belt would often separate from the rotating wheels and rollers on the carrier side and float up, which was a major cause of the belt meandering.

If the belt is lifted up and meanders, items being transported may fall off.

This caused the belt to float up, which created the problem of being unable to prevent the belt from meandering or the items being transported from falling off.
Therefore, the present invention is intended to eliminate the above-mentioned problems.

In order to solve the above problems, the present invention employs a configuration comprising a pair of parallel opposing vertical pillars provided on both sides of the position where the carrier rollers are arranged on the belt conveyor, a lifting frame provided so that sliders at both ends can be slidably engaged with vertical guide rails provided on both vertical pillars to lift and lower the frame, a carrier roller that supports the carrier side belt of the belt conveyor by supporting both ends of a center shaft that supports the carrier rollers in a non-rotating state on a carrier roller stand provided between both ends of the lifting frame, a rotating body supported on the vertical pillars to prevent the carrier side belt from floating up, and a traction means provided to apply a traction force to the lifting frame to lift the total weight of the lifting frame, the sliders , the carrier roller stand and the carrier rollers.

As described above, according to the belt lift prevention and meandering suppression device for the belt conveyor of this invention, the lift frame having the carrier rollers for supporting the carrier side belt is raised and lowered by the guide rails of the vertical pillar material and the sliders that are slidably engaged with the guide rails. Therefore, when the carrier side belt is unloaded, there is no load holding down the carrier side belt, so at least the belt will lift up.

At this time, the lifting frame is raised by the traction means attached to the lifting frame, and the carrier roller and the belt come into contact, so the carrier side belt does not meander when the load is empty.

When an object is present on the carrier belt, the lifting frame descends together with the carrier belt against the pulling force, allowing the object to be transported stably and preventing the object from falling off.

As a result, when the carrier belt is in an unloaded state or is interrupted and no longer carrying any goods, the lifting frame is always in contact with the carrier roller while following the carrier belt that is lifted up due to tension, which prevents wobbling caused by the belt lifting up and has the unique effect of eliminating belt meandering.

In addition, since the belt is not pressed down as in previous countermeasures, no stress is placed on the belt, and the position of the carrier roller follows the up and down movement of the belt, so no undue stress is placed on the belt, and there is also the advantage that the durability of the belt is greatly improved.

Furthermore, unlike conventional countermeasures, the carrier side belt and carrier roller can always be kept in contact, so methods such as using carrier idlers to suppress meandering in normal conveyors can be used, and the type of roller can be changed. That is, for example, a forward-leaning stand can be used to further suppress meandering, a garland can be used to bring the belt and roller into closer contact for stable running, and the rollers can be changed to impact rollers to make them more resistant to impacts, and additional functions used in normal conveyors can be added.

1 is a partially cutaway front view showing an embodiment of the present invention. FIG. 4 is an enlarged front view showing a lifting frame with a support stand of the carrier roller of FIG. FIG. FIG. 4 is a cross-sectional plan view showing the lift guide of the lift frame of the same. 13 is a partially cutaway front view showing another example of preventing the carrier-side belt from floating up. FIG. FIG. 11 is a partially cutaway enlarged front view showing another example of how a lifting force is applied to the lifting frame.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.
In the figure, A is a belt conveyor.

As is well known, the above-mentioned belt conveyor A has an endless belt 1 stretched between a head pulley and a tail pulley (both not shown), and scattered positions on the back surface of the carrier side of the belt 1 are supported by carrier rollers 2, and scattered positions on the surface of the return side of the belt 1 are supported by return rollers (not shown).

As is well known, the support carrier roller 2 for the carrier side belt 1 is a horizontal center roller as shown in the figure, and a pair of side rollers that are inclined upward from the inner end to the outer end on both sides of the center roller are arranged in a trough shape to prevent the transported goods B from falling off.

The carrier rollers 2 are supported by fitting both ends of the center shaft 5 of each carrier roller 2 into and engaging with a stand 4 that stands upright (using a fastening means such as welding) from a lifting frame 3, both ends of which face left and right.

Furthermore, two opposing vertical pillars 7 are provided on the outside of both ends of the lifting frame 3, rising from the conveyor frame 6, and vertical guide rails 8 are provided along the entire length of each vertical pillar 7, and sliders 9 provided on both ends of the lifting frame 3 are slidably engaged with these vertical guide rails 8 (tubular sliders 9 provided on both ends of the lifting frame 3 are fitted into the illustrated vertical guide rails 8) to allow the lifting frame 3 to rise and fall.

In addition, a rotating body 10 is provided above the carrier side belt 1 to prevent the carrier side belt 1 from floating up.

In the case of the above-mentioned rotating body 10 shown in Figures 1, 2, 3 and 4, the center shaft 12 of the pressure roller is engaged and supported by brackets 11 provided at the upper ends of the left and right vertical pillars 7, but this is not limited to this. For example, as shown in Figure 6, both ends of the shaft 14 are supported by support members 13 provided at the upper ends of both vertical pillars 7, and both ends of the center shaft 16 of the wheel serving as the rotating body 10 are supported by the lower ends of a set of two parallel arms 15 whose upper ends are supported at both ends of the shaft 14, so that the belt 1 is pressed down by the rotating body 10 to prevent the belt 1 from lifting up when the transported goods B on the belt 1 are reduced or the belt 1 is empty (this lifting up occurs when the lifting frame 3 is raised).
This prevents the belt 3 from meandering and also prevents the load from spilling.

In addition, a traction means C is provided that applies a lifting force to the lifting frame 3 with a traction force slightly stronger than the total weight of the lifting frame 3 and the carrier roller 2.

The traction means C is provided to apply a pushing force to the lifting frame 3 when the number of transported objects B on the carrier side belt 1 decreases significantly or the belt becomes empty (due to an interruption in the supply of transported objects B).

As shown in Figures 1, 2, 3, 4 and 6, the traction means C is formed by, for example, a pulley 17 in the middle of the vertical pillar 7, a rope 18 that engages the pulley 17 at an inverted part in the middle, and one end of the rope 18 connected to the lifting frame 3 and the other end connected to a weight 19, so that an upward traction force acts on the lifting frame 3, enabling it to respond appropriately to changes in the position of the belt 1 when it is loaded and unloaded.

Naturally, if belt 1 is lifted up and meanders, the goods being transported will be prevented from falling if they are in the middle of being transported.

As another traction means C, as shown in FIG. 7, a rope 18 with one end connected to the lifting frame 3 is inverted midway by a pulley 17, and the other end of the rope 18 is connected to a spring 20 with the end thereof engaged with a stopper 21 on the conveyor frame 6, so that the spring 20 functions as a traction means C equivalent to the weight 19.

This ensures stable running of belt 1 and prevents belt 1 from lifting off carrier roller 2, eliminating spillage and meandering of transported goods.

In the illustrated case, the belt conveyor A has the lifting frame 3 arranged only when it is horizontal, but this is not limited to this. For example, it can be used in a belt conveyor with an upward inclination or a belt on the carrier side that is prone to lifting. For example, it can be used in a belt conveyor with a tripper.
In the figure, reference numeral 25 denotes a support shaft for the pulley.

A: belt conveyor B: conveyed object C: traction means 1: belt 2: carrier roller 3: lifting frame 4: stand 5: center shaft 6: conveyor frame 7: vertical pillar member 8: vertical guide rail 9: slider 10: rotating body 11: bracket 12: center shaft 13: support member 14: shaft member 15: arm 16: shaft member 17: pulley 18: rope 19: weight 20: spring 25: support shaft

Claims (1)

a lifting frame having sliders at both ends slidably engaged with vertical guide rails provided on both vertical pillars for lifting and lowering; a carrier roller support having both ends of a center shaft supporting the carrier roller supported on a carrier roller stand provided between both ends of the lifting frame for supporting the carrier side belt of the belt conveyor; a rotor supported on the vertical pillars to prevent the carrier side belt from lifting ; and traction means provided to apply a traction force to the lifting frame to raise the total weight of the lifting frame , the sliders, the carrier roller stand and the carrier roller.

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