JPH0235698Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to a bucket elevator for an unloader for continuously dredging the earth and sand at the bottom of the water, which is an object to be transported.
Or, it relates to a raking device for digging up dirt and raking it to the scooping part of a bucket.

(Prior Art) There is a bucket elevator type device for dredging earth and sand at the bottom of the water. This device is usually configured as follows.

That is, a bucket elevator is attached to the crane, and the bucket elevator is movable by the operation of the crane. This bucket elevator has an elevator frame supported by the crane, and an upper chain wheel is provided at the upper end of the elevator frame, and a lower chain wheel is provided at the lower end of the elevator frame. A chain is wound around these upper and lower chain wheels, and a large number of buckets are attached to this chain at equal pitches. Then, the lower end of the bucket elevator is placed at the bottom of the water by the crane, and the objects to be transported are successively scooped up and transported by the bucket that moves along with the driven chain.

In some of the above configurations, a scraping blade that rotates together with the lower chain wheel is provided on the outer side of the bucket coaxially with the lower chain wheel. This scraping blade scrapes the conveyed object toward the bucket by its rotation. This increases the efficiency of filling the bucket and ensures smooth conveyance (for example, see Japanese Patent Publication No. 47-21780 filed by the same applicant).

(Problems that the invention aims to solve) By the way, there are cases where large lumps are mixed in the sediment at the bottom of the water, and if the sediment hardens to form a hard bed at the bottom of the water. There is.

When attempting to dredge an object to be transported in the above-mentioned state, the above-mentioned conventional structure causes the following inconvenience.

In other words, since the above-mentioned raking blade is approximately circular in side view, even when digging up a large lump like the one mentioned above, or even when attempting to excavate a hard soil slab, the outer periphery of the raking blade This may cause the inconvenience that the above-mentioned digging and excavation cannot be carried out due to simply sliding. In addition, in some of the above configurations, the outer periphery of the raking blade is used as a cutting blade, but in this case, the cut into the earth and sand becomes too deep, and the contact area between the raking blade and the transported object becomes excessive. A large load will be applied to the rake blades of the lever.
As a result, there is an inconvenience that a large driving force is required for the scraping blades.

Furthermore, in the above conventional configuration, some of the earth and sand that is raked up by the raking blades and tends to head toward the bucket, is once pressed against the side of the lower chain wheel before reaching the bucket, and is pushed toward the bucket. There is also the problem that the smooth movement of people is obstructed.

(Purpose of the invention) This invention was made with attention to the above-mentioned circumstances, and it is possible to dig up and excavate objects to be transported with a small driving force, and
To smoothly move conveyed objects scraped together by scraping blades toward a bucket cart, thereby further improving the work efficiency of a bucket elevator.

(Structure of the invention) The features of this invention to achieve the above object are that the outer circumference of the raking blade is designed to dig up or excavate the object to be transported, and the side surface of the raking blade on the opposite side from the bucket. cutting claws are provided protrudingly on each of the blades, and an outer guide plate is attached to the side surface of the blade, so that when the blade rotates, the outer guide plate moves the object to be transported on the rotation center side of the blade to the protruding end side of the blade. The point is that I tried to guide you.

(Example) Hereinafter, an example of this invention will be described with reference to the drawings.

1 is an unloader, and this unloader 1 is a barge S.
It has a crane 2 installed above and a bucket elevator 3 that is attached to the crane 2 and is movable. Reference numeral 4 denotes a soil bed at the bottom of the water, and this soil bed 4 is formed of accumulated soil such as earth and sand, and in the illustrated example, this is the object B to be transported by the unloader 1.

The crane 2 has a base 2a supported on the barge S, and an arm 2c is pivoted to the base 2a via a pivot shaft 2b so as to be vertically movable. A first
A hydraulic cylinder 2d is installed, and the arm 2c is moved up and down to an arbitrary angle by the operation of this first hydraulic cylinder 2d.

On the other hand, the upper part of the bucket elevator 3 is pivotally supported on the rotation end side of the arm 2c, and the bucket elevator 3 can be moved up and down to an arbitrary position by rotation of the arm 2c. In addition, a second hydraulic cylinder 2e is installed between the vertical midway part of the bucket elevator 3 and the rotating end side of the arm 2c, and the operation of the second hydraulic cylinder 2e allows the bucket elevator 3 to move to any angle. be rotated.

The bucket elevator 3 has an elevator frame 6. A pair of upper chain wheels 7, 7 serving as an upper car are supported at the upper end of the elevator frame 6, and a pair of lower chain wheels 8 serving as a lower car are supported at the lower end. ,8
is supported. A pair of chains 9, 9 serving as winding bodies are wound around the upper chain wheel 7 and the lower chain wheel 8, and a large number of bucket belts 10 are attached to the chains 9, 9 at equal pitches. Further, in this case, the bucket bag 10 is located between both upper chain wheels 7, 7 and between both lower chain wheels 8, 8. The upper chain wheel 7 is operatively connected to a drive motor M.

The lower chain wheels 8, 8 are attached to a driven shaft 11 supported on the lower end of the elevator frame 6. Further, scraping blades 12, 12 are attached to both ends of the driven shaft 11, respectively, to rotate together with the driven shaft 11 and scrape the transported object B toward the bucket 10. are provided on the outside of each lower chain wheel 7 on the opposite side to the bucket cart 10.

Each of the scraping blades 12 includes a boss 13 fitted to the driven shaft 11, and four blades 15a to 15 protruding radially outward from the outer peripheral surface 13a of the boss 13.
d, and these blades 15a to 15d have the same shape and size and are arranged at equal intervals in the circumferential direction of the boss 13. In addition, these blades 15a to 15d are inclined at the same angle (θ) with respect to a plane perpendicular to the axis of the lower chain wheel 8, so that the rotation of the scraping blade 12 (see FIG.
It is formed so that the objects B to be conveyed are gathered toward the bucket 10 side by arrow A) in FIGS. 3 and 4.

Scraping blades include an outer guide plate 16 and an inner guide plate 17 that move the transported object B on the rotation center side toward the outer circumferential side of the scraper blade 12 by rotation of the scraper blade 12. It is attached to the side of 12. The outer guide plate 16 is provided on the outer surface of the raking blade 12 in the opposite direction to the bucket 10 side, and the inner guide plate 17 is provided on the inner surface of the raking blade 12 on the side facing the bucket 10.

The four outer guide plates 16 are provided on the outer surface of the scraping blade 12 at equal intervals in the circumferential direction, and each outer guide plate 16 has the same shape and size. Each outer guide plate 16 has a spiral shape in which one end is connected to the outer circumferential surface 13a of the boss 13, the other end faces rearward in the rotational direction (arrow A) of the scraper blade 12, and gradually expands outward in the radial direction. It is said that Further, each of the outer guide plates 16 is provided so as to straddle three adjacent blades of the scraping blade 12.

With reference to FIGS. 3 and 4, the three blades 15a,
One outer guide plate 16 provided so as to straddle 15d and 15c will be explained. Here, the blades 15d and 15c are sequentially provided adjacent to each other at the rear of the blade 15a in the direction of rotation of the raking blade 12 (hereinafter referred to simply as the rear, and the opposite as the front).

The outer guide plate 16 is a first
- Consists of third outer plate members 16a to 16c.
That is, the first outer plate member 16a is welded to the outer surface of the blade 15a, the front end of the first outer plate member 16a is welded to the outer peripheral surface 13a of the boss 13, and the rear end is butted against the front edge of the blade 15d. There is. Also,
The second outer plate member 16b is welded to the outer surface of the blade 15d, and its front end is attached to the first outer plate member 16a.
The rear end is butted against the front edge of the blade 15c. This second outer plate member 16
An imaginary circle passing through the rear end of b almost matches the outer diameter (dc) of the lower chain wheel 8. Further, the third outer plate member 16c is attached to the blade 1 in the axial direction of the scraper blade 12.
The blade 5a and the blade 15d are interposed at the overlapping portion.

Note that the other three outer guide plates 16 are also formed in the same manner as the above outer guide plate 16.

On the other hand, four inner guide plates 17 are provided on the inner surface of the scraping blade 12 at equal intervals in the circumferential direction, and each inner guide plate 17 is formed in the same manner as the outer guide plate 16. That is, each inner guide plate 17 has the same shape and size, and has a spiral shape in which one end is connected to the outer circumferential surface 13a of the boss 13, the other end faces rearward, and gradually expands outward in the radial direction. has been done. Further, each inner guide plate 17 is provided so as to straddle two adjacent blades of the scraping blade 12.

With reference to FIGS. 3 and 4, two blades 15a,
One inner guide plate 17 provided so as to span 15d will be explained.

The inner guide plate 17 is composed of first and second inner plate members 17a and 17b that are continuously arranged. That is, the first inner plate member 17a has the blade 15
This first inner plate member 17a is welded to the inner surface of the first inner plate member 17a.
The front end is welded to the outer circumferential surface 13a of the boss 13, and the rear end is located at approximately the same position as the rear end of the third outer plate member 16c. Further, the second inner plate member 1
7b is welded to the inner surface of the blade 15d, and the front end of this second inner plate member 17b is connected to the third outer plate member 16.
c and each rear end of the first inner plate member 17a. An imaginary circle passing through the rear end of the second inner plate member 17b substantially matches the outer diameter (dc) of the lower chain wheel 8.

Then, when the scraping blade 12 rotates, each blade of the scraping blade 12 scrapes the transported object B toward the bucket 10 side. At this time, the object B located on the axially outer side of the scraper blade 12 is moved by the outer guide plate 16 from the rotation center side to the protruding end side of each blade 15a to 15d. Then, this transported object B is transferred to the third outer plate member 16c of the outer guide plate 16.
Each blade 15 of the scraping blade 12 is radially outward from the
It is made to flow toward the bucket bag 10 side through between each of the protruding ends a to 15d.

On the other hand, the conveyed object B located on the axially inner side of the scraping blade 12 is caused to flow toward the bucket 10 and is guided radially outward of the scraping blade 12 by the inner guide plate 17 .

Then, the outer guide plate 16 and the inner guide plate 17
Due to the effect of
is suppressed from being pressed against the lower chain wheel 8. As a result, the transported object B can be smoothly transferred to the bucket 10.
As a result, the efficiency of filling the bucket 10 with the objects B to be transported is increased, thereby increasing the efficiency of unloading by the bucket elevator 3.

Further, cutting claws 19 are provided on the scraping blades 12 in a protruding manner. The cutting claws 19 include a first cutting claw 19a protruding from the outer periphery of the scraping blade 12, and a bucket 10.
It is composed of second to fourth cutting claws 19b to 19d protruding from the side surface of the scraping blade 12 on the opposite side.

Here, in order to explain the cutting claw 19 in more detail, what is provided on the blade 15d will be explained.

Three first cutting claws 19a are provided on the outer periphery of the blade 15d at approximately equal intervals. These first cutting claws 19a are provided so as to protrude from the middle of the outer peripheral portion of the blade 15d radially outward of the blade 15d and toward the front. Also, the second
The cutting claw 19b is the front edge of the outer peripheral part of the blade 15d,
From the outer surface of this blade 15d, the first cutting claw 19a
It is provided so as to protrude in the same direction.

The third cutting claw 19c is provided to protrude forward from the outer surface of the midway portion of the front edge of the blade 15d.

Further, the fourth cutting claw 19d is provided in the middle of the second outer plate member 16b in the circumferential direction. This fourth cutting claw 19d is radially outward of the blade 15d,
Moreover, the blade 15d is protruded toward the front.
protrudes away from the outer surface of the

Note that the other three blades 15 also have the above blade 15d.
Similarly, cutting claws 19 are provided protrudingly.

When the scraping blade 12 excavates the transported object B on the hard soil bed 4, the cutting claws 19 protruding from the scraping blade 12 cut into the soil bed 4. Further, in this case, even if the cutting claws 19 cut into the soil 4, the contact area between the cutting claws 19 and the transported object B is small, so only a small load is applied to the scraping blades 12, and the scraping blades 12 can be scraped with a small driving force. The blades 12 can be rotated.

Furthermore, since the cutting claws 19 are also provided on the outer surface of the scraping blade 12, even when excavating while moving the scraping blade 12 in the lateral direction, the conveyed object B can be excavated by the cutting claws 19 in the same manner as described above. can.

In addition, the bulk carrier 2 indicated by the two-dot chain line in Figure 2
The same applies to the case where the transported object B is unloaded from the hold of ship No. 0 by the bucket elevator 3.

(Effects of the invention) According to this invention, cutting claws are provided protruding from the outer circumference of the raking blade and the side surface of the raking blade opposite to the bucket, so that dirt and sand containing large lumps can be removed. When unloading coal ore, etc. or dredging solidified and hardened soil at the bottom of water, the cutting claws protruding from the scraper blades are used to dig up or excavate the material to be transported. be able to. Further, in this case, since the contact area between the cutting claw and the object to be transported is small, only a small load is applied to the scraping blade, and therefore the scraping blade can be rotated with a small driving force.

Therefore, the objects to be conveyed can be effectively scraped up to the scooping part of the bucket cart by the scraping blades, and the working efficiency of the bucket cart elevator can be improved.

Moreover, according to this invention, an outer guide plate is attached to the side surface of the blade on the opposite side from the bucket, and when the blade rotates, the outer guide plate moves the object to be conveyed on the rotation center side of each blade to the protrusion of the same blade. Since the conveyed material is guided toward the end side, the conveyed objects scraped together by the blades are prevented from moving toward the center of rotation of the lower car, which is disposed coaxially with and parallel to the blades. In other words, it is possible to prevent the objects being raked up from being pressed against the side surface of the lower car.
Therefore, the objects to be conveyed are smoothly moved toward the bucket cart side by scraping by the scraping blades, so that the work efficiency of the bucket elevator can be improved in this respect as well.

[Brief explanation of the drawing]

The figures show an embodiment of this invention, in which Fig. 1 is a lower side view of the bucket elevator, Fig. 2 is an overall view of the unloader, Fig. 3 is a view taken along the - line in Fig. 1, and Fig. 4 is a side view of the bottom of the bucket elevator. 1 is a partially enlarged view of FIG. 1... Unloader, 2... Crane, 3... Bucket elevator, 6... Elevator frame,
7... Upper chain wheel (upper wheel), 8... Lower chain wheel (lower wheel), 9... Chain (winding body), 10... Bucket, 12... Scraping blade, 15a to 15d... Blade , 16... Outer guide plate, 19... Cutting claw, B...
...Object to be transported.

Claims (1)

[Scope of utility model registration request] An upper car is supported at the upper end of the elevator frame, and a lower car is supported at the lower end, and a winding body is provided which is wound around and driven by the upper car and the lower car. A large number of buckets are attached to the above-mentioned hoisting body so as to be adjacent to each other, and raking blades that rotate together with the lower car to scrape the conveyed material toward the bucket are installed on the lower part on the opposite side from the bucket on the same axis as the lower car. In a bucket elevator for an unloader, which is provided on the outside of the car, and in which the scraping blade is composed of a plurality of blades that protrude radially outward from the rotation center side, the outer circumferential portion of each of the blades and the side opposite to the bucket A cutting claw is provided protrudingly on the side surface of each blade, and an outer guide plate is attached to the side surface of the same blade, so that when the blade rotates, the outer guide plate cuts the object to be conveyed on the rotation center side of each blade. A conveyed object scraping device for a bucket elevator for an unloader, characterized in that the conveyed object is guided toward the protruding end side.