JPH0748037A - Bucket chain elevator type excavating device - Google Patents

Abstract

PURPOSE:To prevent the breakage of a device and improve the discharged efficiency by properly averting an overload state by arranging a load detecting means at the top end of an excavating frame supported at the top end of a swing frame and vertically turning the excavating frame according to the detected load. CONSTITUTION:The rod 17b of a swing cylinder 17 is extended, and the rod 20b of a turning cylinder 20 is contracted, and a swing frame 16 and an excavating frame 19 are kept in an L-shape. In this state, the bulk cargo 27 at the center part is discharged by vertically introducing the excavating device into a hold 28, in this state. While, the rod 17b is contracted, and the rod 20b is extended, and the swing frame 16 is swung forwardly, keeping the excavating frame 19 horizontally. At the same time, the cylinder 17 is driven to keep the tension of a bucket chain elevator 25 constant. In this state, the bulk cargo 27 in the peripheral part in the hold 28 is discharged. Then, the load of the excavating frame 19 is detected by a sensor 30, and the rod 20b is contracted in case of overload.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bucket chain elevator excavator used for unloading bulk cargo, for example.

[0002]

2. Description of the Related Art Bulk cargo such as ores loaded and unloaded is loaded and unloaded by moving a bucket chain elevator excavator into and out of a hold. A conventional bucket chain elevator excavating device will be described with reference to FIG. FIG. 3 shows a side view of a conventional bucket chain elevator excavating device.

As shown in the figure, a swing frame 3 is swingably supported around a horizontal axis via a shaft 2 at the lower end of the elevator column 1, and the tip of the swing frame 3 is parallel to the shaft 2. An excavation frame 5 is rotatably supported around a horizontal axis via a shaft 4. Cylinder 6 in elevator column 1
The main body 6a is rotatably supported, and the tip of the rod 6b of the hydraulic cylinder 6 is rotatably supported by the swing frame 3. That is, the swing frame 3 is swung with respect to the elevator column 1 by driving the cylinder 6. A tension link 9 having substantially the same length as the swing frame 3 is supported by the elevator column 1 and the excavation frame 5 via shafts 7 and 8, and the excavation frame 5 swings the swing frame 5 by the tension link 9. It is always kept horizontal regardless of the angle.

Guide sprockets 10, 11 are provided at both ends of the excavating frame 5, and the guide sprockets 10, 11 are provided.
A bucket chain elevator 12 that circulates in the elevator column 1 is wound around 11. A large number of buckets (not shown) are supported by the bucket chain elevator 12,
As the bucket chain elevator 12 circulates, the bulk goods 13 are carried into the elevator column 1 and unloaded by the bucket. Incidentally, reference numeral 14 in FIG. 3 is a wall of the hold.

In the conventional bucket chain elevator excavator described above, as shown by the solid line in FIG. 3, the rocking frame 3 and the excavating frame 5 are brought into a substantially L-shape by extending the rod 6b of the cylinder 6. In this state, by moving the hold of the ship up and down, the bulk cargo near the center of the hold 1
3 unloading operation is performed. Further, as shown by the one-dot chain line in FIG. 3, by contracting the rod 6b of the cylinder 6, the rocking frame 3 rocks forward while the excavation frame 5 remains horizontal. In this state, the unloading operation of the bulk goods 13 near the wall 14 is performed.

[0006]

When the bulk load 13 near the wall 14 is unloaded by the conventional bucket chain elevator excavator, the bulk load 13 leaning on the wall 14 may cause an unexpected collapse of the load. When the bulk load 13 collapses, the bucket chain elevator 12 at the tip of the excavation frame 5 is covered with the bulk load 13 and a large load is applied to the bucket chain elevator 12, which causes a large resistance to the circulation drive of the bucket chain elevator 12, and the bucket chain elevator 12 has a large resistance. It may not be able to circulate or overstress the structure.

[0007] In such a state, an operation of retracting the elevator column 1 from the wall 14 and advancing it again by a small distance (indicated by arrows a and b in the figure) or moving the elevator column 1 up and down is determined by the driver. Operation (arrow c,
(indicated by d) or the operation of tilting the elevator column 1 to reciprocate (indicated by arrows e and f in the figure) is manually performed to avoid the overload state. However, this overload avoidance operation is difficult to accurately respond, and the device is overloaded,
In addition, the efficiency of unloading was inevitable.

The present invention has been made in view of the above circumstances, and provides a bucket chain elevator excavating device capable of avoiding an overload on the bucket chain elevator at the tip end side of an excavating frame in a prompt manner, thereby providing an overload. The purpose of this is to prevent the equipment from being worn out and prevent the efficiency of unloading from decreasing.

[0009]

SUMMARY OF THE INVENTION To achieve the above object, the structure of the present invention supports a swing frame which swings about a horizontal axis at the lower end of an elevator column, and forms a swing center of the swing frame. The excavation frame, which is driven to rotate about parallel central axes, is supported at the tip of the rocking frame, and guide sprockets are provided at the tip of the rocking frame and both ends of the rocking frame to guide the bucket chain elevator circulating in the elevator column. A load detecting means is provided for detecting the load at the tip of the excavation frame while rotating the sprocket and rotating the excavation frame when the load is overloaded to avoid the overload condition. To do.

[0010]

The rocking frame is rocked with respect to the elevator column to move the tip of the excavation frame to a desired position, and the bucket chain elevator is circulated to excavate. The load at the tip of the excavation frame during excavation is detected by the load detection means, and when the load is overloaded, the excavation frame is rotated with respect to the swing frame to avoid the overloaded state.

[0011]

1 is a side view of a bucket chain elevator excavator according to an embodiment of the present invention.

As shown in the figure, an upper frame 53 is swingably supported around a horizontal axis via a shaft 52 at the lower end of the elevator column 51, and a slide frame 54 is stretchably supported by the upper frame 53. ing. The hydraulic cylinder 15 is provided across the upper frame 53 and the slide frame 54, and the slide frame 54 expands and contracts with respect to the upper frame 53 by the driving of the hydraulic cylinder 15. A main body 17a of the swing cylinder 17 is rotatably supported by the elevator column 51, and a tip of a rod 17b of the swing cylinder 17 is rotatably supported by an upper frame 53. In other words, the swing frame 16 is configured by the upper frame 53 and the slide frame 54, and the swing frame 16 is driven by the swing cylinder 17 to drive the rod 1
The expansion and contraction of 7b allows the elevator column 51 to swing freely around a horizontal axis.

An excavation frame 19 is rotatably supported by a tip of the swing frame 16, that is, a tip of the slide frame 54 via a shaft 18 parallel to the shaft 52 about a horizontal axis. The main body 20a of the rotary cylinder 20 is rotatably supported by the slide frame 54, and the tip of the rod 20b of the rotary cylinder 20 is rotatably supported by the excavation frame 19. The rod 20 is driven by the rotation cylinder 20.
By the expansion and contraction of b, the excavation frame 19 rotates with respect to the slide frame 54, and the excavation frame 19 is maintained in a horizontal state regardless of the swing angle of the swing frame 16 (see the alternate long and short dash line in FIG. 1). .

Guide sprocket wheels 21, 22, 23, 24 are provided at the lower part of the elevator column 51, the upper end of the upper frame 53 and both ends of the excavation frame 19, and the guide sprocket wheels 21, 22, 23, 24 are provided inside the elevator column 51. The bucket chain elevator 25 that circulates to is rotating. A large number of buckets 26 are supported by the bucket chain elevator 25, and the bucket chain elevator 25 is cyclically driven by a driving means (not shown). As the bucket chain elevator 25 circulates, the bucket 26 causes the bulk goods 27 to move into the elevator column 51.
It is carried inside and unloaded. Reference numeral 28 in the drawing is a wall of the hold.

A protective cover 29 is provided at the tip of the excavation frame 19 to cover the bucket 26a at the tip, and the protective cover 29 is provided with a load detecting sensor 30 as a load detecting means for detecting the load of the bulk load 27. ing.
The load detection sensor 30 may be provided on the elevator column 51. Further, it is possible to detect the load due to the bulk load 27 by detecting the fluctuation of the driving force of the patrol drive means of the bucket chain elevator 25, and further, the bulk load can be detected by detecting the hydraulic pressure fluctuations of the swing cylinder 17 and the rotating cylinder 20. It is also possible to detect the load due to 27.

In the bucket chain elevator excavator described above, as shown by the solid line in the figure, the rod 17b of the rocking cylinder 17 is extended and the rod 20b of the rotary cylinder 20 is contracted, whereby the rocking frame 16 and the excavating frame are excavated. The frame 19 is brought into a substantially L shape. In this state, by moving the hold of the ship up and down, the bulk cargo near the center of the hold 2
7 unloading operation is performed.

Further, as shown by a dashed line in the figure, by contracting the rod 17b of the rocking cylinder 17 and extending the rod 20b of the rotary cylinder 20, the excavating frame 16 remains horizontal and the rocking frame 16 is kept horizontal. Swings forward. At this time, the tension of the bucket chain elevator 25 is kept constant by the driving of the hydraulic cylinder 15.
In this state, the bulk cargo 27 in the periphery of the hold and near the wall 27
Unloading operation is performed.

If an unexpected collapse of the load occurs during excavation of the bulk load 27, the bulk load 27 covers the bucket chain elevator 12 at the tip of the excavation frame 19 and a large load is applied. The load at the tip of the excavation frame 19 is detected by the load detection sensor 30, and when the load is overloaded,
The rod 20b of the rotating cylinder 20 contracts, and the excavation frame 19 moves upward (in the direction of arrow g) as shown by the chain double-dashed line in the figure.
To avoid the overload condition.

A control device for the bucket chain elevator excavator described above will be described with reference to FIG. FIG. 2 shows a control block configuration of the control device.

The control device 50 determines the presence / absence of overload from the detection data of the load detection sensor 30.
A control switching unit 32 that operates by a signal from the overload detection unit 31, an excavation frame horizontal control unit 33 connected to a switching terminal of the control switching unit 32, and an excavation frame tip vertical movement control unit 34 for avoiding overload. , Crane operation instruction input section 3
5 and an automatic control unit 36 to which control signals from the excavation frame horizontal control unit 33, the excavation frame tip vertical movement control unit 34, and the crane operation instruction input unit 35 are input.

A control signal from the automatic control unit 36 is input to the excavation frame drive unit 37, the bucket chain elevator drive unit 38, the traveling drive unit 39, the swing arm drive unit 40, and the elevator column drive unit 41.

The excavation frame drive unit 37 drives the rotary cylinder 20 based on the input signal to drive the excavation frame 19.
To maintain horizontal and avoid overload. The bucket chain elevator drive unit 38 cyclically drives the bucket chain elevator 12 based on the input signal. The traveling drive unit 39 causes a crane (not shown) to travel based on the input signal to move the bucket chain elevator excavator to a predetermined position. The oscillating arm drive unit 40 drives the oscillating cylinder 17 based on the input signal to cause the oscillating frame 16 to move.
Rocking drive. Furthermore, the elevator column drive unit 41
Rotates the elevator column 51 based on the input signal and positions the bucket chain elevator excavator in a predetermined direction.

During excavation of the bulk goods 27 by the bucket chain elevator excavator, the load on the protective cover 29 at the tip of the excavation frame 19 is detected by the load detection sensor 30. The detection signal of the load detection sensor 30 is the control device 5
0 is input to the overload detection unit 31, and it is determined whether or not there is an overload. When there is no overload, the control switching unit 32 connects to the excavation frame horizontal control unit 33 and sends a control signal to the automatic control unit 3.
Tell 6. In the case of overload, the control switching unit 32 connects with the excavation frame tip vertical movement control unit 34 and transmits a control signal to the automatic control unit 36.

The crane equipped with the bucket chain elevator excavator is operated by the automatic control unit 36 controlling the drive units 37 to 41 in accordance with the instruction from the operation instruction input unit 35. Drilling frame 1 when there is no overload
9 is controlled by the control signal of the excavation frame horizontal control unit 33 to carry out the unloading operation while keeping the horizontal state. When an overload occurs, the control switching unit 32 switches the control to the excavation frame tip vertical movement control unit 34 for avoiding the overload.

Under the control of the vertical movement control unit 34 for the tip of the excavation frame, the rod 20b of the rotary cylinder 20 is immediately contracted and driven from the unloading operation state in which the excavation frame 19 is kept horizontal, and the tip of the excavation frame 19 is moved to the position shown in FIG. To arrow g
As shown in FIG. 5, the bulky goods 27 are rotated upward and come out of the bulky goods 27 (indicated by a chain double-dashed line in FIG. 1). The excavation frame 19 rotates until the overload state is eliminated, and when the overload is eliminated, the rod 20b of the rotation cylinder 20 is extended and driven, and the excavation frame 19 rotates downward as indicated by arrow h in FIG. Back to the horizontal position. When the excavation frame 19 returns to the horizontal state, there is no overload, and the control switching unit 32 switches to switch back to the control operation by the excavation frame horizontal control unit 33.

Therefore, in the bucket chain elevator excavator described above, when the load during excavation becomes an overload state,
Since the excavation frame 19 is rotated upward to avoid the overload, it is not necessary to move the elevator column 51 with respect to the wall 28, and the position of the elevator column 51 associated with the overload avoidance operation is eliminated. No correction operation is required. That is, the overload avoiding operation can be performed extremely easily.

Further, as shown in FIG. 2, it becomes possible to respond promptly by automatic control in response to detection of overload,
The overload avoidance control can be accurately executed without delay, and the efficiency of unloading operation can be prevented from decreasing.

In the above embodiment, the avoidance operation against the overload caused by the bulk goods 27 has been described, but the excavation frame 19 operates similarly even if the overload caused by contact with an object other than the bulk goods 27 occurs. , The danger can be avoided.

The configuration of the control device 50 is not limited to that shown in FIG. 2 and can be implemented by appropriately changing it.

[0030]

In the bucket chain elevator excavator of the present invention, the excavation frame is rotated up and down in accordance with the load on the tip of the excavation frame detected by the load detection means. The load can be accurately detected without delay, and the overload avoidance operation can be quickly and easily performed depending on the presence or absence of the overload. As a result, damage to the device can be prevented and the efficiency of unloading operation can be improved.

[Brief description of drawings]

FIG. 1 is a side view of a bucket chain elevator excavating device according to an embodiment of the present invention.

FIG. 2 is a control block diagram of a control device.

FIG. 3 is a side view of a conventional bucket chain elevator excavating device.

[Explanation of symbols]

 16 swing frame 17 swing cylinder 19 excavation frame 20 swing cylinder 25 bucket chain elevator 27 bulk load 28 wall 29 protective cover 30 load detection sensor 31 overload detection unit 32 control switching unit 33 drilling frame horizontal control unit 34 drilling frame tip Vertical motion control unit 50 Control device 51 Elevator column 53 Upper frame 54 Slide frame

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Naoki Kumamoto 4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima City, Hiroshima Prefecture Mitsubishi Heavy Industries, Ltd. Hiroshima Research Laboratory (72) Inventor Hiroshi Azenuma 4-chome Kannon Shincho, Nishi-ku, Hiroshima City, Hiroshima Prefecture 6-22 No. 22 Mitsubishi Heavy Industries, Ltd. Hiroshima Works (72) Terumi Kobayashi, 1st Kimitsu, Kimitsu-shi, Chiba Nippon Steel Co., Ltd. Inside Kimitsu Works (72) Inventor, Koyoshiro Inoue 20 Shintomi, Futtsu-shi, Chiba Prefecture -1 Inside Nippon Steel Co., Ltd. Technology Development Division

Claims (1)

[Claims] 1. An excavation frame, which is swingably driven around a horizontal axis, is supported at a lower end of an elevator column, and an excavating frame is swingably driven around a central axis parallel to the swing center of the swing frame. It is supported at the tip, and guide sprockets are provided at the tip of the excavation frame and at both ends of the swing frame, respectively.The bucket chain elevator circulating in the elevator column is wound around the guide sprockets while detecting the load at the tip of the excavation frame. A bucket chain elevator excavating device comprising: load detecting means for rotating an excavating frame when a load is in an overloaded state to avoid the overloaded state.