JP3411738B2 - Continuous unloader using bucket elevator - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous unloader using a continuous bucket elevator,
More specifically, it is an object of the present invention to absorb and detect a thrust force generated in a lower excavation portion of a bucket elevator during cargo handling in this type of unloader to prevent a bending accident of the excavation portion frame, and further to protect the unloader main body.

[0002]

2. Description of the Related Art In this type of unloader, a thrust force from the hull may be generated in the lower excavation portion of the bucket elevator due to vertical movement of the ship due to waves or the like, or erroneous operation of the bucket elevator. In addition, depending on the condition of the handled items (loads), the stack may be solidified and have a high hardness. Even in such a case, when trying to excavate the bucket elevator as it is, the reaction force of the handled items pushes up the force to the lower excavation part. May occur.

When such a thrusting force is applied to the lower excavation portion, there is a disadvantage that the excavation portion frame is bent. Therefore, conventionally, the following technique of detecting the thrust force and retracting the excavation frame is known.

[0004] those shown in Japanese Patent Laid-Open No. 6-72561, as shown in FIG. 5, vertically movable disposed collector frame C by cylinder B to the elevator frame A, Ri preparative lower drilling portion D to the collector frame C It is equipped with a bucket elevator.

In this structure, the lower excavation portion D is composed of a horizontally expanding and contracting inner and outer frame, sprockets attached to both end portions of the frame, and a chain upper and lower guide rail E provided at the lower portion of the outer frame. It is provided with a strain gauge or load cell to the intake only part with Ri of the upper guide rail.

Therefore, when a thrust force is generated in the lower excavated portion, it is detected by the strain gauge or the load cell, and the telescopic cylinder B is operated to raise the collector frame C to avoid the impact on the lower excavated portion D. ing. However, this structure has a drawback that the structure is complicated, the size is increased, and the cost is increased because the structure has a mechanism for moving the excavating part up and down through the collector frame.

Next, as disclosed in Japanese Utility Model Laid-Open No. 61-151931, as shown in FIG. 6, a unloading unit (bucket elevator) F is attached with an excavating unit G, and a shaft of the unloading unit F. A distance detecting device I for detecting the distance to the excavation surface is provided at the lower end of H. Therefore, since the excavation unit G is driven up and down according to the distance detection of the unloading unit F, it may not be possible to respond when a thrust force that does not match the distance detection position occurs.

[0008]

SUMMARY OF THE INVENTION In the continuous unloader using the bucket elevator as described above, the present invention buffers the thrust force applied to the lower excavation portion at the initial stage, and subsequently generates a further thrust force. During the operation, the means for raising the bucket elevator by detecting the thrusting force is provided to prevent the lower excavation portion from being bent and thus to protect the bucket elevator.

[0009]

According to the present invention, a front link and a rear link are pinned to the lower end of the frame of a bucket elevator, and the lower excavation frame is pinned and supported to the other ends of both links. A cylinder is arranged between the rear link and the lower end of the frame of the bucket elevator, and a shock absorber having a detecting function is provided at the tip of the front link, and the shock absorber is pinned to the lower excavation unit frame. The present invention relates to a continuous unloader characterized by

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below. First, the overall configuration of a continuous unloader using a bucket elevator according to the present invention will be described with reference to FIG. 1 is an unloader girder that can run freely along the landing berth. 2 is a swivel mounted on the girder 1,
The swing base is provided with a boom 3 which is elevated by the operation of a cylinder 7.

Reference numeral 4 denotes a bucket elevator, which is suspended by a pin at the tip of the boom 3 and which is parallel to the boom 3 and is also pinned to a triangular frame on the swivel base 2 via a small link. Since they are pin-connected, the bucket elevator 4 is always suspended in a vertical state with respect to the elevation of the boom 3. Incidentally, 6 indicates a frame of a vertical elevator portion of the bucket elevator 4, and 5 indicates a bucket elevator 4
It is the lower excavation part of.

In the bucket elevator 4, two parallel chains are endlessly wound between a sprocket provided at the top of the bucket and sprockets provided at both ends of the excavation frame of the lower excavation unit 5, and a large number of chains are provided on the two chains. It has continuous buckets and can be continuously pumped.

The bulk cargo lifted by the bucket elevator 4 is discharged into the enclosure when the bucket is turned over on the bucket elevator 4, and the rotary table and chute, the conveyor in the boom, the hopper in the swivel stand, the conveyor in the girder, etc. are discharged. It is transferred to the above ground conveyor.

Now, the structure of the bucket elevator of the present invention used in the continuous unloader using such a bucket elevator will be described in detail below with reference to FIGS. Figure 2 shows the lower excavation section for the bucket elevator.
Ri attached shows a state, FIG. 3, FIG. 4 shows a specific embodiment of a push-up force shock detecting device.

In FIG. 2, a vertical frame 6 of the bucket elevator 4 is provided with a rear link 8 and a front link 9 which are bent forward and bent at the lower end of the frame 6, and the rear link 8 is bent. A cylinder 10 is pinned and interposed between the vertical section and the vertical section frame 6. The upper end pin attachment portion a and the lower end pin attachment portion b of the rear link 8 are horizontally eccentric to each other. The rear link 8 may be a straight member parallel to the front link 9.

Reference numeral 11 denotes an excavation frame which is provided with a horizontal cylinder and is composed of inner and outer double cylinders which expand and contract by the cylinder. The rear link 8 is pin-coupled to one end of the excavation section frame 11, and the excavation section frame 1
The front link 9 is connected to the central portion of the outer cylinder 1 via a thrust force buffering detection device 12.

Reference numerals 13 and 14 denote sprockets attached to both ends of the excavating frame 11, and a chain 15 of the bucket elevator is endlessly wound between the sprockets attached to the top of the bucket elevator.

FIG. 3 shows an embodiment of the thrust force buffering detection device. This cushioning detection device is equipped with an outer cylinder 16 fixed to the front link 9, a rod 17 housed in the outer cylinder 16 and pinned to the lower excavation unit frame 11, and between the outer cylinder 16 and the rod 17. The spring 18, the limit switch 19 and the rod 17 fixed inside the top of the outer cylinder 16.
It has a switch cam 20 that is fixed to the tip of the switch and that kicks the limit switch 19 by the movement of the rod 17, and is configured to extend and contract so that it is extended by the spring force and shortened by the push-up force.

The structure of the thrust force buffering / detecting device 12 will be described in more detail. The outer cylinder 16 is divided into upper and lower two stages, each of which is connected by flange members 21 and 22. A flange member 23 is also provided at the lower end of the lower outer cylinder. The lower end portion of the rod 17 is formed to have a large diameter, and the spring seat 24 is supported by the step portion 17 'of the large diameter portion.

The spring 18 is provided between a flange member 21 provided at the upper end of the lower outer cylinder and a spring seat 24.
Further, a constant compressive force is applied to the spring 18 by tightening a bolt 25 screwed into a screw formed on the upper portion of the rod 17. That is, during normal cargo handling work,
The spring 18 does not bend, and is set to bend when a thrust force is generated in the excavation frame 11.

In order to satisfy the above setting conditions, the compression force and spring constant applied to the spring 18 are appropriately selected in consideration of the property of the object to be handled. Reference numeral 26 is a guide member fixed to the lower flange member for guiding the large diameter side of the rod 17.

According to the above construction, the rod 17 has the spring 1
Although the excavation reaction force is received by the elastic force of 8, the rod 17 moves upward in the outer cylinder 16 against the elastic force of the spring 18 when a thrust force is generated in the lower excavated portion. That is, the push-up force is absorbed by the bending of the spring 18 and buffered.

When a large thrust force that cannot be absorbed is generated due to the bending of the spring 18, the rod 17 is further moved.
Moves upward in the outer cylinder 16, so that the switch cam 20 fixed to the rod 17 kicks the limit switch 19 fixed to the outer cylinder 16, and at that time, the boom 3 is raised by the signal of the limit switch 19. Then, the bucket elevator 4 is raised and retracted.

FIG. 4 shows the construction of another embodiment of a hydraulic shock absorber detection device. A hydraulic cylinder 27 is attached to the lower excavation unit frame 11 by a pin. 28
Is a piston rod of the hydraulic cylinder 27 and is fixed to the front link 9. 29 is a hydraulic cylinder 27
Accumulator connected to, 30 is piston rod 2
8 is a bellows-shaped cover. Further, the limit switch 19 is fixed to the flange member of the piston rod 28, and the switch cam 20 is fixed to the upper flange member of the hydraulic cylinder 27. The limit switch 19 is expanded and contracted so as to be expanded by hydraulic pressure and shortened by thrust force. .

In the hydraulic shock absorber shown in FIG. 4, the excavation reaction force is received by the hydraulic pressure set by the accumulator 29. Therefore, when the thrusting force is generated, the pressure in the hydraulic cylinder 27 becomes equal to or higher than the set pressure, the pressure oil in the cylinder is returned to the accumulator 29, and the hydraulic cylinder 27 moves upward. That is, the thrust force is absorbed by the hydraulic pressure (hydraulic cylinder) and is buffered.

Now, when a large thrusting force is generated, the hydraulic cylinder 27 further moves upward, and the switch cam 20 kicks the limit switch 19,
At this time, the boom 3
To move the bucket elevator up and evacuate. The hydraulic pressure setting pressure of the accumulator 29 is set so that the cylinder 27 does not contract during normal cargo handling work, and the cylinder 27 contracts when a thrust force is generated.

[0027]

According to the present invention, since the lower excavation frame of the bucket elevator is suspended via the spring-type and hydraulic-type shock-absorbing detecting devices, the thrust force which is suddenly generated is absorbed by the spring force or the hydraulic pressure. At the same time, a large push-up force can be detected by a limit switch in the buffer detection device to move the bucket elevator upward and retract.

That is, a small push-up force is absorbed in the buffer detection device to maintain continuity of the unloading work, and when a large push-up force is applied, this is detected by the buffer detection device to detect the bucket elevator. Can be evacuated to prevent accidents such as bending of the drilling frame.

When a large thrust force is generated, the bucket elevator is retracted after the thrust force is detected, which causes a time lag from detection to retract.
In the present invention, as shown in FIG. 2, since the cylinder 10 is interposed between the rear link 8 and the bucket elevator vertical portion frame 6, when the thrust force equal to or higher than the set pressure of the cylinder 10 is generated, the cylinder 10 has a cushioning action. Will work.

That is, although the relief valve (not shown) operates and the cylinder shortens, the pin attachment points a and b of the rear link 8
Is eccentric, the lower excavation part swings as shown by the arrow. As a result, the lower excavation portion moves slightly upward, and the cushioning action directly acts on the thrust force. Of course, the set pressure of the cylinder 10 is higher than the spring pressure and hydraulic pressure of the buffer detection device 11.

[Brief description of drawings]

FIG. 1 is an overall schematic view of a continuous unloader using a bucket elevator.

FIG. 2 is a schematic view of the mounting of a lower excavation frame of a bucket elevator showing an embodiment of the present invention.

FIG. 3 is a cross-sectional view of a spring-type thrust-up force buffer detection device used in the present invention.

FIG. 4 is a cross-sectional view of a hydraulic thrust force detection device used in the present invention.

FIG. 5 is a push-up force detection device showing a conventional example.

FIG. 6 is a position detecting device for the bucket elevator.

[Explanation of symbols]

1 girder 2 swivel base 3 boom 4 bucket elevator 5 Lower excavation section 6 Vertical elevator part frame 8 back links 9 Forward link 10 cylinders 11 Excavation frame 12 Buffer detector

─────────────────────────────────────────────────── --Continued front page (56) References JP-A-7-228359 (JP, A) JP-A-6-72561 (JP, A) JP-A-59-64406 (JP, A) 103541 (JP, U) (58) Fields surveyed (Int.Cl. ⁷ , DB name) B65G 67/60

Claims (4)

(57) [Claims] 1. A attach the front link and the rear link at the bottom of the bucket elevator frame swingably, with the interposition of elastic cylinder between the rear link and the elevator frame, a bucket to the other end of the front link and the rear link No lower drilling portion frame of the elevator so as to swingably Installing with supported, and continuous unloader with a bucket elevator which is characterized in that by interposing a retractable buffer detector forward link. 2. A continuous unloader using a bucket elevator according to claim 1, wherein a shock absorber is interposed between the front link and the mounting portion of the lower excavation frame. 3. A continuous unloader using a bucket elevator according to claim 1, wherein a buffer detection device using a spring action is used. 4. A continuous unloader using a bucket elevator according to claim 1, wherein a buffer detection device using hydraulic pressure is used.