WO2014024564A1

WO2014024564A1 - Continuous unloader

Info

Publication number: WO2014024564A1
Application number: PCT/JP2013/066252
Authority: WO
Inventors: 政樹河原林
Original assignee: 住友重機械搬送システム株式会社
Priority date: 2012-08-09
Filing date: 2013-06-12
Publication date: 2014-02-13
Also published as: KR20150021998A; JP2014034458A; CN104520216A; TW201408571A

Abstract

A bucket elevator-type continuous unloader (1) is provided with a bucket elevator (9) for continuously conveying bulk material (M). The bucket elevator (9) is provided with: buckets (27) for scooping and loading the bulk material (M); a chain (25) for holding the buckets (27); a load motor (75) for driving and circulating the chain (25); an inverter (73) for detecting a load on the load motor (75); and a PLC (80) which, when a value based on the load detected by the inverter (73) is less than or equal to a set value (A), controls the load motor (75) and reduces the movement speed of the buckets (27) to a speed lower than the speed of a case where the value based on the load is greater than the set value (A).

Description

Continuous unloader

The present invention relates to a bucket elevator type continuous unloader.

Conventionally, an unloader disclosed in Patent Document 1 below is known as a technology in such a field. The unloader includes a drive device for rotating the bucket, a torque detector for detecting the torque of the drive device, and a control device for controlling the drive of the drive device. This control device is configured to execute one of a plurality of control modes in accordance with the detection value of the torque detector.

JP 2002-274657 A

However, in the above unloader, the bucket moving speed is the same when the bucket is loaded with an object and when the bucket is not loaded. Thus, since the moving speed of the bucket is the same regardless of whether or not the object is loaded, energy loss occurs in a state where the bucket does not load the object. Therefore, there is room for improvement in power consumption when the bucket moves.

In view of this problem, an object of the present invention is to provide a continuous unloader with reduced power consumption and improved energy efficiency.

The continuous unloader of the present invention is a bucket elevator type continuous unloader including a bucket elevator that continuously conveys an object, and the bucket elevator holds a plurality of buckets for scraping and loading the object and the bucket. An endless chain, a drive unit that drives and circulates the endless chain, a detector that detects a load of the drive unit, and a value based on the load detected by the detector is less than or equal to a predetermined value, the drive unit is And a control unit that controls to lower the moving speed of the bucket than when the value based on the load is larger than a predetermined value.

According to the configuration provided with such a control unit, when the value based on the load of the driving unit becomes a predetermined value or less, the moving speed of the bucket is reduced. Therefore, since the speed of the bucket is reduced when the load on the driving unit is small, it is possible to reduce power consumption when the load of the target object of the bucket is small, and to improve energy efficiency. it can.

Further, the control unit reduces the moving speed of the bucket when the load detected by the detector is equal to or lower than a predetermined value, and the predetermined value is a driving unit in a state where a plurality of buckets are not loaded with an object. It may be a load. In this case, since the speed of the bucket is reduced when the bucket is not loaded with an object, power consumption can be suppressed in an idling state where excavation is not performed, and energy efficiency can be improved. .

Further, the control unit may increase the bucket moving speed when the value based on the load detected by the detector exceeds a predetermined value in a state where the bucket moving speed is reduced. In this case, since the moving speed of the bucket is increased when excavation is performed, the conveyance can be efficiently performed when the object is loaded.

According to the present invention, it is possible to provide a continuous unloader with reduced power consumption and improved energy efficiency.

It is a figure which shows the continuous unloader which concerns on embodiment of this invention. It is a partially broken perspective view of the bucket elevator upper part in the continuous unloader of FIG. It is a block diagram which shows the structure of the electric system in the continuous unloader of FIG. It is a flowchart which shows the control process of the moving speed of the bucket in the continuous unloader of FIG.

Hereinafter, embodiments of a continuous unloader according to the present invention will be described in detail with reference to the drawings.

A bucket elevator type continuous unloader (CSU) 1 for ships shown in FIGS. 1 and 2 is a device that continuously unloads bulk loads M (for example, coke and ore) from a ship hold 103. The continuous unloader 1 includes a girder 2 that can travel along the quay 101 by two rails 3 a laid in parallel to the quay 101. The girder 2 is a main body that can be installed on the upper surface of the quay 101. A swivel frame 5 is supported on the girder 2 so that the swivel frame 5 can swivel, and a bucket elevator 9 is supported at a tip end portion of a boom 7 projecting laterally from the swivel frame 5. The bucket elevator 9 is configured to maintain the vertical position by the balancing lever 12 and the counterweight 13 regardless of the undulation angle of the boom 7.

The continuous unloader 1 includes a cylinder 15 for adjusting the hoisting angle of the boom 7. When the cylinder 15 is extended, the boom 7 is upward and the bucket elevator 9 is raised, and when the cylinder 15 is contracted, the boom 7 is downward and the bucket elevator 9 is lowered.

The bucket elevator 9 is configured to continuously excavate and scrape the bulk load M in the hold 103 by the side surface excavation type scraper 11 provided at the lower portion thereof, and to transport the scraped bulk load M upward. It is.

The bucket elevator 9 includes an elevator main body 23 that constitutes the elevator shaft 21 and a chain bucket 29 that rotates around the elevator main body 23. The chain bucket 29 includes a pair of roller chains (endless chain) 25 connected in an endless manner, and a plurality of buckets 27 supported at both ends by the pair of chains 25. Specifically, the two chains 25 are juxtaposed in a direction perpendicular to the paper surface of FIG. 1, and each bucket 27 is suspended between the two chains 25 as shown in FIG. In this manner, the chain 25 is attached to the chain 25 via a predetermined fixture.

Furthermore, the bucket elevator 9 includes

drive rollers

31a, 31b, and 31c around which the chain 25 is bridged, and a turning roller 33 that guides the chain 25. The driving roller 31 a is provided at the uppermost part 9 a of the bucket elevator 9, the driving roller 31 b is provided at the front part of the scraping part 11, and the driving roller 31 c is provided at the rear part of the scraping part 11. The turning roller 33 is a driven roller located slightly below the driving roller 31a, and guides the chain 25 and changes the traveling direction of the chain 25. Further, a cylinder 35 is interposed between the driving roller 31b and the driving roller 31c. By extending and contracting the cylinder 35, the distance between the axes of the both

driving rollers

31b and 31c is changed, so that the chain bucket 29 The moving orbit can be changed. Corresponding to the presence of two chains 25, there are also two

drive rollers

31a, 31b, 31c and two turning rollers 33, respectively, which are arranged in parallel in a direction perpendicular to the paper surface of FIG.

When the

driving rollers

31a, 31b, and 31c drive the chain 25, the chain 25 rotates around the elevator main body 23 in a direction indicated by an arrow W (positive direction) with respect to the elevator body 23. It circulates between the uppermost part 9a and the scraping part 11 while moving around.

As shown in FIG. 2, the bucket 27 of the chain bucket 29 ascends with its opening 27a facing upward. And in the uppermost part 9a of the bucket elevator 9, when passing the drive roller 31a, the chain 25 changes direction from upward to downward, and the opening 27a of the bucket 27 turns downward. A discharge chute 36 is formed below the opening 27a of the bucket 27 that faces downward as described above. The lower end of the discharge chute 36 is connected to a rotary feeder 37 disposed on the outer periphery of the bucket elevator 9.

The rotary feeder 37 conveys the loose load M carried out from the discharge chute 36 to the boom 7 side. As shown in FIG. 1, a boom conveyor 39 is arranged on the boom 7, and the boom conveyor 39 supplies the bulk load M transferred from the rotary feeder 37 to the hopper 41. Below the hopper 41, an in-machine belt feeder 43 and an in-machine conveyor 45 are arranged.

The landing of the loose load (object) M using the continuous unloader 1 is performed as follows. The scraping part 11 at the lower end of the bucket elevator 9 is inserted into the hold 103, and the chain 25 is rotated in the direction of the arrow W in the figure. If it does so, the bucket 27 located in the scraping part 11 will excavate and scrape the bulk load M, such as a coke and an ore, continuously. Then, the loose load M scraped and loaded in these buckets 27 is conveyed vertically upward to the uppermost portion 9 a of the bucket elevator 9 as the chain 25 rises.

After that, the bucket 27 passes through the position of the driving roller 31 a and the bucket 27 rotates, so that the loose load M falls from the bucket 27. The bulk M dropped from the bucket 27 falls into the discharge chute 36 and is carried out to the rotary feeder 37 side, and is further transferred to the boom conveyor 39 and conveyed to the hopper 41. Further, the loose load M is carried out to the ground side equipment 49 via the belt feeder 43 and the in-machine conveyor 45. The above operations are repeatedly performed using the plurality of buckets 27, whereby the loose load M in the hold 103 is continuously landed.

By the way, the continuous unloader 1 includes a load motor 75 for driving the

drive rollers

31a, 31b, and 31c. As shown in FIG. 3, the load motor 75 operates by obtaining power from a power supply 71 of the power supply system 70. The power supply system 70 includes the power supply 71, a load motor 75, a converter 72, an inverter 73, and a PLC (Programmable Logic Controller) 80. The power source 71 is a commercial power source and supplies AC power to the converter 72. Converter 72 converts AC power supplied from power supply 71 into DC power. The converter 72 and the inverter 73 are connected via a DC bus L, and the DC power converted by the converter 72 is supplied to the inverter 73 via the DC bus L. Inverter 73 converts the DC power from converter 72 into AC power having a predetermined frequency, and supplies this AC power to load motor 75. The load motor 75 is operated by AC power from the inverter 73, and the

drive rollers

31a, 31b, 31c are driven by the operation of the load motor 75. In this manner, the

drive rollers

31a, 31b, 31c and the load motor 75 function as a drive unit that drives the chain 25 to rotate.

The inverter 73 is connected to a PLC 80 that is a control unit that controls the continuous unloader 1 in an integrated manner. The inverter 73 functions as a detector that detects the torque of the load motor 75 and outputs the detected value to the PLC 80 as a torque signal that is an electric signal. When receiving a torque signal from the inverter 73, the PLC 80 performs a predetermined calculation based on the detected value to calculate the moving speed of the bucket 27, and outputs the calculated moving speed to the inverter 73 as a speed signal. The inverter 73 supplies power corresponding to the speed signal to the load motor 75 to control the moving speed of the bucket 27 in the arrow W direction.

The control processing of the moving speed of the bucket 27 by the PLC 80 is performed based on, for example, the flowchart shown in FIG. The process shown in FIG. 4 is executed, for example, every predetermined time. Below, the control process of the moving speed of this bucket 27 is demonstrated.

First, the inverter 73 detects the torque of the load motor 75 and outputs a torque signal to the PLC 80 in step S1 (hereinafter referred to as “S1”. The same applies to other steps). Next, the PLC 80 determines whether or not the torque detected in S1 is larger than a preset value A which is a preset predetermined value (S2). For example, when the bucket 27 is unloading the loose load M and when it is determined that the torque is larger than the set value A, the process proceeds to S3. On the other hand, for example, when the bucket 27 is in an idling state where the loose load M is not being unloaded and when it is determined that the torque is not greater than the set value A, the process proceeds to S4. As an idling state, for example, a state in which the bulldozer moves the bulk load M to a position where the loose load M is easily unloaded in the hold 103 and the bucket 27 is idled.

In S3, the PLC 80 outputs a speed signal to the inverter 73 so as to move the bucket 27 at a preset specified speed. Then, the inverter 73 supplies electric power corresponding to the speed signal to the load motor 75, and the bucket 27 moves at a specified speed, and the series of processes ends. On the other hand, in S4, the PLC 80 outputs a speed signal to the inverter 73 so as to move the bucket 27 at a lower speed slower than the specified speed. And the inverter 73 supplies the electric power according to the said speed signal to the load motor 75, the bucket 27 comes to move at a decreasing speed, and complete | finishes a series of processes.

In the continuous unloader 1 according to the present embodiment, when the value based on the load detected by the inverter 73 is larger than the set value A, the load motor 75 is controlled to set the moving speed of the bucket 27 as the specified speed, and the value based on the load. Is less than or equal to the set value A, the load motor 75 is controlled to reduce the moving speed of the bucket 27. Therefore, since the speed of the bucket 27 is reduced when the load of the load motor 75 is small, it is possible to suppress power consumption when the load of the loose load M is small, and to improve energy efficiency. Can do. Furthermore, the basic unit, which is the amount of energy required for lifting a certain amount of loose load M, can be improved, and the load applied to the chain 25 is reduced by reducing the moving speed of the bucket 27. Therefore, it is possible to extend the life of the chain 25.

Further, the PLC 80 reduces the moving speed of the bucket 27 when the load detected by the inverter 73 becomes equal to or less than the set value A. This set value A is in the state where the bucket 27 is not loaded with the loose load M. The load of the load motor 75 may be sufficient. In this case, the speed of the bucket 27 is reduced when there is no bulk load M, so that power consumption is suppressed in the idling state, and energy efficiency can be further improved.

In addition, the PLC 80 increases the moving speed of the bucket 27 to a specified speed when the value based on the load exceeds the set value A in a state where the moving speed of the bucket 27 is set to a reduced speed. Therefore, since the moving speed of the bucket 27 is increased when the bulk load M is loaded and the torque is increased, the conveyance can be efficiently performed when the bulk load M is loaded. Instead of automatically setting the moving speed of the bucket 27 to the specified speed as described above, the moving speed of the bucket 27 may be manually returned to the specified speed based on the judgment of the driver or the like.

As mentioned above, although embodiment of this invention was described, this invention is not restricted to the said embodiment, You may deform | transform within the range which does not change the summary described in each claim. For example, in the above-described embodiment, an example in which the process of the flowchart illustrated in FIG. 4 is performed at predetermined time intervals has been described, but the process may be performed only when necessary instead of at predetermined time intervals.

In the above embodiment, the example in which the moving speed of the bucket 27 is changed based on whether or not the detected torque is larger than the set value A has been described. Is not limited to this example. That is, for example, the determination may be made based on whether the detected differential value of the torque has become a predetermined value or more, or may be determined based on whether the average value of the torque has become a predetermined value or more. . Furthermore, a switch that allows the operator to select between a specified speed and a reduced speed may be provided, and it may be determined whether to set the specified speed or the reduced speed according to the selection status of the switch.

The present invention can be used as a continuous unloader with reduced energy consumption and improved energy efficiency.

DESCRIPTION OF SYMBOLS 1 ... Continuous unloader, 9 ... Bucket elevator, 25 ... Chain (endless chain), 27 ... Bucket, 31a, 31b, 31c ... Drive roller (drive part), 73 ... Inverter (detector), 75 ... Load motor (drive part) ), 80... PLC (control unit), M .. bulk load (object).

Claims

A bucket elevator type continuous unloader having a bucket elevator for continuously conveying an object,
The bucket elevator is
A plurality of buckets for scraping and loading the object;
An endless chain holding the bucket;
A drive unit for driving and circulating the endless chain;
A detector for detecting a load of the driving unit;
When the value based on the load detected by the detector becomes a predetermined value or less, the drive unit is controlled to lower the moving speed of the bucket than when the value based on the load is larger than the predetermined value. A continuous unloader.
The control unit reduces the moving speed of the bucket when the load detected by the detector is equal to or less than the predetermined value,
2. The continuous unloader according to claim 1, wherein the predetermined value is a load of the drive unit in a state where the plurality of buckets are not loaded with the object.
The control unit increases the moving speed of the bucket when a value based on a load detected by the detector exceeds the predetermined value in a state in which the moving speed of the bucket is reduced. The continuous unloader according to claim 1 or 2.