JP2022099484A - Belt meandering adjustment device in belt conveyor - Google Patents

Abstract

To provide a device that can adjust meandering of the belt in a belt conveyor, as well as, tension of the belt.SOLUTION: A belt meandering adjustment device in which a tip of each of output shafts 7 is connected to each of two bearings 5 of respective center support shafts 4 of a tail pulley 1 in a belt conveyor A, each of male threads 8 at ends of both output shafts 7 is screwed into a female thread 12 at each center of worm wheels 11 of both worm reducing units 10, a worm gear 13 with a motor 14 to drive reversibly is engaged with the worm wheel 11, both output shafts 7 are individually controlled by the motor 14 to be pushed out and pulled back, and according to a degree of meandering of a belt 3 detected by meandering detection means, movement distances of the parallelly arranged output shafts 7 are simultaneously and individually controlled by being stopped, pushed out, or pulled back, and tension of the belt 3 is kept within a proper range and the tail pulley 1 is tilted at a predetermined angle to eliminate meandering of the belt 3.SELECTED DRAWING: Figure 1

Description

The present invention relates to a device capable of tensioning a belt as well as adjusting the meandering of the belt in a belt conveyor.

Conveyor equipment includes conveyors with different specifications such as the size of the machine length and the size of the belt width. In either case, the device that drives the conveyor belt and the known device that tensions the belt required for that purpose. There is a way.

Among them, conveyors with a short machine length and conveyors with a high transfer speed are the ones that are difficult to manage in terms of operation.

In particular, it is said that a conveyor with a short captain generally has a high number of times the belt circulates, so that the belt is difficult to stabilize and there is a high probability that the load will drop or meander.

Among them, the rate of meandering of the belt is high, so the administrator has a lot of trouble to stabilize the belt, and the unstable belt is especially on both sides of the belt in the width direction (generally, the ears of the belt). ) Is easily damaged, and it often causes unstable operation, operation stoppage, and load drop.

Therefore, support each roller stand of the carrier roller that supports the carrier side belt so that each roller stand can be swiveled to correct the meandering of the belt due to contact between the swivel roller of the roller stand and the side edge of the belt. There is a method of turning to (see, for example, Patent Document 1 and Patent Document 2).

By the way, according to the methods of Patent Documents 1 and 2, since the swivel roller stand is provided at each dotted position of the entire length of the carrier belt, there is a problem that the device becomes large and the cost increases significantly, and the captain However, there is a problem that it is not effective for a conveyor with a short machine length, while it is effective for correcting the meandering of a long belt conveyor.

Therefore, in order to solve the above-mentioned problem, one end of the support shaft on the center line of the tail pulley in the belt conveyor is moved in the traveling direction of the belt of the belt conveyor, and the other end of the support shaft is traveled by the belt of the belt conveyor. A method is known in which the meandering of the conveyor belt is corrected by moving the tail pulley in the opposite direction and tilting the tail pulley (see, for example, Patent Document 3).

Japanese Unexamined Patent Publication No. 2008-127177 Japanese Unexamined Patent Publication No. 2008-308252 Japanese Unexamined Patent Publication No. 60-242111

By the way, according to the meandering adjustment method of the belt conveyor by the method of Patent Document 3, both bearings rotatably attached to both ends of the tail pulley of the conveyor belt and slidably installed in the tension direction of the belt are attached to the hydraulic cylinder. It is connected so that one of the bearings slides forward in the traveling direction of the belt and the other slides backward in the traveling direction of the belt due to the action of the cylinder.

In this method, when the traveling belt is displaced due to meandering during operation of the conveyor belt, the tension distribution of the conveyor belt applied to the rotating shaft from the tail pulley is small for one bearing and large for the other bearing. Then, the pressure distributed to this load is detected by the pressure sensor, each pressure signal is input to the differential pressure calculator, the differential pressure is calculated, this value is input to the control device, and then the differential pressure signal. Based on this, a current that excites the solenoid is sent to switch the hydraulic valve to retract one cylinder and extend the other cylinder, which complicates the structure and has a problem in dealing with the instantaneous correction of the meandering of the belt. there were.

That is, since one of the cylinders is extended and the other is retracted, there is a problem that the accurate stopping property of the tilting stop position of the head pulley is caused by the variation of hydraulic pressure compression.

Therefore, an object of the present invention is to provide a belt meandering adjusting device in a belt conveyor that eliminates the above-mentioned problems.

In order to solve the above problems, the present invention connects the front-facing tips of the output shafts to the bearings provided at both protruding ends of the center support shaft of the tail pulley in the belt conveyor via universal joints, and both outputs. A worm gear having a male screw provided at the end of the shaft screwed into a female screw provided at the center of the worm wheel of both worm reducers supporting the conveyor frame, and the worm wheel has a reversible drive motor for the worm wheel. And the meandering detection means of the carrier side belt is provided on both sides of the carrier side belt in front of the tail pulley, and both output shafts are individually controlled to push out and pull back by the reversible drive motor, and the meandering detection is performed. When the meandering of the belt and its degree are detected by the means, the belt is controlled by controlling the stop, push-out operation, or pull-back operation and their operation distances of the parallel output shafts simultaneously and individually according to the degree of meandering. The tension of the belt is kept within the proper range, and the tail pulley is tilted by a predetermined angle to cancel the meandering of the belt.

As described above, according to the belt meandering adjusting device in the belt conveyor of the present invention, when the carrier side belt of the belt conveyor meanders due to some factor, the meandering is detected by the detecting means, and the worm acts with the detection. The speed reducer, for example, pushes out one output shaft and pulls back the other output shaft to tilt the tail pulley, which has the effect of automatically adjusting the meandering of the belt.

And since the worm reducer is used for pushing and pulling back the output shaft, the rotation of the worm wheel stops at the same time as the operation of the worm reducer is stopped and it becomes a locked state, and it is possible to guarantee an accurate stop position. can.

Since both output shafts are individually pushed out and pulled back and their operating distances are controlled by the reversible drive motor, the belt tension can be kept within an appropriate range by adjusting the operating amount of both output shafts. The tail pulley can be tilted by a predetermined angle while it is being stored to cancel the meandering of the belt, and even if the belt does not meander, if the tension of the entire belt deviates from or is likely to deviate from the appropriate value, the movement amount of both output shafts can be adjusted. It is also possible to correct the tension of the belt to an appropriate value.

It is a top view which shows the embodiment of this invention. It is a partial notch enlarged plan view which shows the main part of the same above. It is an enlarged front view of the same as above. It is a top view which shows the flow of information about a drive. It is a top view which shows the flow of information about control. It is a front view of the detection means. It is the same side view. It is an operation chart diagram of the meandering adjustment device.

Next, an embodiment of the present invention will be described with reference to the accompanying drawings.
A shown in FIG. 1 is a belt conveyor.

As is well known, the belt conveyor A includes a rear tail pulley 1 and a front head pulley (not shown), and an endless belt 3 extending between the tail pulley 1 and the head pulley. The lower surface dotted position of the carrier side belt 3 is supported by a carrier roller (not shown) such as a trough type, and the lower surface dotted position of the return side belt 3 of the belt 3 is supported by a return roller (not shown).

Further, as shown in FIG. 1, both ends of the center support shaft 4 penetrated through the shaft core of the tail pulley 1 are supported by bearings (not shown) incorporated in both ends of the tail pulley 1, and the center support shaft 4 is supported. Bearings 5 are provided at both ends of the protrusion.

Further, the tip of the output shaft 7 whose end faces rearward is connected to each of the bearings 5 via a universal joint 6.

Further, as shown in FIGS. 1, 2, and 3, each of the above output shafts 7 is provided with a male screw 8 on the outer periphery in the middle of the terminal side, and the male screw 8 is installed in the conveyor frame 9 as a worm reducer 10. By screwing into the female screw 12 at the center of the worm wheel 11 and reversibly driving the worm gear 13 that meshes with the worm wheel 11 by the motor 14, the output shaft 7 of the belt 3 travels in the opposite direction (push, push,). Since it slides (pull), the tail pulley 1 is tilted.

As a result, a force in the meandering correction direction acts on the belt 3 as the tail pulley 1 tilts.

In the figure, 15 is a push-pull type load cell of the output shaft 7 interposed above the output shaft 7, and the load cell 15 measures the tension on the bearing 5 by measuring the force applied to the output shaft 7. At the same time, the purpose is to protect belts, pulleys or ancillary equipment.

Further, on the outside of both side edges of the carrier side belt 3 inverted by the tail pulley 1, a detecting means S is provided which is in contact with the outer edge (belt ear) of the meandering belt 3 and detects meandering as it is pushed down.

As the above-mentioned detecting means S, the side edge of the belt 3 comes into contact with the touch rotating body 19 provided at the upper end of the lever 18 supporting the lower end of the movable shaft 17 of the case 16, so that the amount of meandering of the belt 3 is increased. Is now detected.

The above-mentioned detection is determined by the pushing-down angle of the rotating body 19 due to the meandering of the belt 3. That is, according to the above determination, the output shaft 7 is pushed out and the pullback action is transmitted to the worm reducer 10.

The amount of meandering of the belt 3 increases as the tilt angle of the lever 18 increases.

Therefore, if the increase in the danger state is warned by blinking of the colored lamp as the tilt angle of the lever 18 increases (not shown), the degree of danger can be visually observed.

Further, as shown in FIG. 4, the machine side control panel 21 of the control unit related to the drive is connected to the motor 14 of the worm reducer 10 via the first circuit 22 and is connected to the motor 14 in the meandering correction direction of the belt 3. Is designed to drive.

Further, as shown in FIG. 5, the second circuit 25 is connected to the load cell 15 and the encoder 24 of the worm reducer 10 from the machine side control panel 23 of the control unit regarding the position and the traction force.

The encoder 24 grasps and recognizes the position of the bearing 5 of the tail pulley 1 by counting the rotation direction and the rotation speed of the motor 14, and sends the position information of the bearing 5 to the control unit via the second circuit 25. There is.

When the meandering factor of the belt 3 disappears, the pushing of one output shaft 7 and the pushing and pulling of the other output shaft 7 are eliminated.

With the above configuration, when a meandering occurs in the carrier side belt 3 of the belt conveyor A, the meandering is detected by the detecting means S, and one of the worm wheels 11 and 11 of the worm reducers 10 and 10 on both sides is detected. Rotate counterclockwise, rotate clockwise, one output shaft 7 in parallel in the traveling direction of the carrier side belt 3, and the other output shaft 7 in the opposite direction of the traveling direction of the carrier side belt 3 male screw 8 And slide it as the female screw 12 engages.

Since the locking action of stopping the rotation of the worm wheel 11 when the operation of the worm reducer 10 is stopped, there is no fine movement of both output shafts 7 and a reliable stop position is guaranteed.

As described above, it is possible to quickly respond to the meandering of the belt 3 of the belt conveyor A, and by using the worm reducer 10 according to the degree of meandering of the belt, the tail pulley 1 has an appropriate tilt angle for correcting the meandering. Can be controlled as such.

Of course, if it is necessary to adjust the overall tension of the belt 3 at the same time, for example, while rotating the worm wheels 11 and 11 of the worm reducers 10 and 10 on both sides in the reverse direction as described above, the output shafts 7 on both sides The slide amount of 7 is different, or the position of the bearing 5 on one side is not moved, and the remaining bearing 5 on the other side is pushed out and pulled back, or the bearings 5 on both sides are pushed out or pulled back at the same time. At the same time, by making a difference in the amount of movement, the meandering adjustment of the belt 3 can be performed while adjusting the overall tension.

In short, the tail pulley 1 is tilted by appropriately adjusting the amount of extrusion / pullback of one bearing 5 and the amount of extrusion / pullback of the other bearing 5, and the force for correcting the meandering acts on the belt 3 due to this tilt to the return side. While correcting the meandering of the belt 3 of the above, the belt tension value of the belt conveyor can always be maintained properly and automatically, and further, the tension can be maintained by pushing out or pulling back the amount bearings 5 and 5 without adjusting the meandering. You can also adjust only the value.

FIG. 8 is a chart showing the operation of the belt meandering adjusting device in the belt conveyor of the present invention.

First, when the tension force of the tail pulley 1 deviates from the specified tension value due to the elongation of the belt 3 or the like, the load cell 15 detects the value and sends the information to the control panel 23 through the second circuit 25 of FIG. Based on the information, both motors 14 and 14 are driven through the first circuit 22 of FIG. 4 to move the bearing 5 in a direction of increasing the tension force of the tail pulley 1, and when the tension value reaches a specified value, the motor 14 is stopped to carry the bearing. Fix the position of 5.

Next, when a meandering occurs in the belt 3, the ear of the belt 3 pushes down the rotating body 19 of FIGS. 6 and 7, the belt offset switch is turned on, and the tilting angle of the rotating body 19 is equal to or more than a predetermined angle. (20 ° or more in the embodiment of FIG. 8), the belt 3 drives the motor 14 on the offset side, and the bearing 5 is moved in the direction of increasing the tension to cancel the meandering.

At that time, as shown in the second circuit 25 of FIG. 5, the position of the bearings 5 on both sides, that is, the degree of inclination of the tail pulley 1 is monitored by the information from both encoders 24, and the degree of inclination exceeds a predetermined value. In this case (in the embodiment of FIG. 8 when the bearing deviation exceeds 32.5 mm), the conveyor is stopped for safety.

Of course, at the same time, the motor 14 is driven and stopped while monitoring the tension in both bearings 5 so as to be in an appropriate range based on the information from the load cell 15.

Further, even when the degree of meandering of the belt 3 becomes too large and the tilt angle of the rotating body 19 exceeds a predetermined value (30 ° in the embodiment of FIG. 8), the conveyor is stopped for safety.

When the tail pulley 1 is tilted by the controlled drive of the motor 14, the meandering of the belt 3 is canceled, and the belt 3 is no longer in contact with the rotating body 19, the motor 14 is stopped and the tail pulley is caused by the structure of the worm reducer 10. The bearing 5 of 1 is fixed, and the belt conveyor A continues to drive.

A Belt conveyor S Detection means 1 Tail pulley 3 Belt 4 Center support shaft 5 Bearing 6 Flexible joint 7 Output shaft 8 Male screw 9 Conveyor frame 10 Worm reducer 11 Worm wheel 12 Female screw 13 Worm gear 14 Motor 15 Load cell 16 Case 17 Movable shaft 18 Lever 19 Rotating body 21 Control panel 22 1st circuit 23 Control panel 24 Encoder 25 2nd circuit

Claims (1)

The tips facing the front of the output shaft are connected to the bearings provided at both protruding ends of the center support shaft of the tail pulley in the belt conveyor via universal joints, and the male screws provided at the ends of both output shafts are connected to the conveyor frame. It is screwed into the female screw provided in the center of the worm wheel of both worm reducers supported by the worm wheel, and the worm gear having the reversible drive motor of the worm wheel is engaged with the worm wheel, and the carrier side belt in front of the tail pulley is engaged. The carrier-side belt serpentine detecting means are provided on both sides of the carrier-side belt, and both output shafts are individually controlled to push out and pull back by the reversible drive motor. By controlling the stop, push, or pull back operations and their operating distances of the parallel output shafts simultaneously and individually according to the degree of meandering, the tail pulley can be specified while keeping the belt tension within the appropriate range. A belt meandering adjusting device in a belt conveyor, which is characterized by tilting an angle to cancel the meandering of the belt.

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