JPH10194467A - Bucket guide device for continuous unloader - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the damage and bending of a guide roller and a guide rail, by comprising a pair of bead-like guide rollers rolling in a pair of guide rail grooves, and a stopper roller for preventing the backward jumping of a bucket. SOLUTION: A vertical axis 22a of a guide roller 22, is inclined backward to a perpendicular 26 rectangular to a passage of a chain 12, that is, a horizontal line connecting the points 24a of a chain mounting port 24, by an angle ϕ. Any size of ϕ will do so long as it is slightly larger than an inclination angle of a bucket 11 under a condition that the scraping resistance acts on the bucket 11, and a stopper roller 23 is kept into contact with a bottom face of the guide rail 21. Accordingly ϕ is 3-6 deg.. When the vertical axis 22a of the guide roller 22 is inclined backward, the guide roller 22 receives the upward frictional force along a slope from the guide rail, and the force in the transverse direction, received by the guide rail, is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous unloader used for unloading bulk materials such as coal from a bulk carrier ship to land, and more particularly, to guide a bucket to smoothly move at a scraping portion. The present invention relates to a bucket guide device.

[0002]

2. Description of the Related Art FIG. 2 is an elevation view of a continuous unloader. The continuous unloader 1 has a traveling frame 3 traveling along the quay 2, and a turning frame 4 on the traveling frame 3.
Is attached. The swiveling frame 4 is provided with a tiltable boom 5, and a top frame 6 is attached to a tip of the boom 5. A parallelogram is formed by the top frame 6, the balancing frame 7, the revolving frame 4 and the boom 5, so that the bucket elevator 8 attached to the top frame 6 always keeps vertical regardless of the tilt of the boom 5. It has become. 9 is L
Reference numeral 10 denotes a rotary scraper.

FIG. 3 is an enlarged elevation view of the scraping section 9.
The scraping section 9 is provided with a chain sprocket 14 at the tip and a chain sprocket 15 at the base.
An endless chain 12 to which a large number of buckets 11 for transporting bulk materials are attached extends. Scraping part 9
Can be expanded and contracted and tilted by a telescopic cylinder 13 and a tilt cylinder 16.

[0004] In order to unload the bulk material loaded on the bulk carrier ship 17, the bulk material is excavated while the scraping section 9 is fed in the lateral direction of the bucket. The bucket 11 rises in the bucket elevator 8. Rotary feeder 1
The vehicle is conveyed to the outside by a land conveyor (not shown) provided along the quay 2 via an in-premise conveyor (not shown) on the boom 5 and the traveling frame 3.

Since a large force acts on the bucket 11 during the scraping operation, if the bucket 11 is supported only by the tension of the chain 12, an excessive force is applied to the chain 12 and the bucket 11 jumps up. . A bucket guide device is provided so that the bucket 11 moves smoothly in the scraping section 9. 4A and 4B are drawings of the bucket guide device, wherein FIG. 4A is a front view and FIG. 4B is a side view.

In these figures, reference numeral 20 denotes a bucket guide device. A pair of guide rails 21 is provided inside the chain 12 along the path of the chain 12 of the scraping section 9. Since the scraping portion 9 expands and contracts as described above, there are two types, one provided inside the guide roller 22 as shown by a solid line and the other provided outside the guide roller 22 as shown by a dashed line. The guide rail 21 provided inside is fixed to the tip side of the scraping section 9, the guide rail 21 provided outside is fixed to the base end side of the scraping section 9, and a guide is provided at an intermediate portion of the scraping section 9. The roller 22 is sandwiched between the guide rails 21 on both sides.

[0007] The guide rail 21 has a trapezoidal groove 21a which is opened to the side. Reference numeral 22 denotes a pair of guide rollers, which is attached to the upper front of the bucket 11 and rolls in a groove 21 a of the guide rail 21. The guide roller 22 has an abacus shape and rotates about a longitudinal axis 22a. Reference numeral 23 denotes a stopper roller, which is attached to the upper rear of the bucket 11. Stopper roller 23
When the scraping resistance F is applied to the tip of the bucket 11 during scraping, the scraper comes into contact with the bottom surface 21b of the guide rail 21 to prevent a large jump of the bucket 11 rearward.

Reference numeral 24 denotes a pair of chain mounting members, each having a trapezoidal shape as viewed from the side, and mounted on the upper side of the bucket 11. The chain 12 is attached to the tip 24a of the chain attachment member. 25 is bucket 1
1 is an arrow showing a traveling direction of the first embodiment.

[0009]

In the above-described bucket guide device 20, when the scraping resistance force F acts on the bucket 11, the stopper roller 23 slightly rises, and as shown in FIG. Bottom 2
1b. The longitudinal axis 22a of the guide roller 22 is mounted perpendicular to the upper surface of the bucket 11, and when the stopper roller 23 rises, the longitudinal axis 22a is inclined forward by the inclination angle α of the bucket 11 due to structural clearance. When the longitudinal axis 22a tilts forward, the guide roller 22 acts to bite into the guide rail 21 during rolling, and as a result, the guide rail 21 and the guide roller 22
Causes a large lateral force in the lateral direction, causing problems such as breakage of the guide roller 22, bending of the guide rail 21, and stoppage of the apparatus. Hereinafter, the estimation of the magnitude of the horizontal force will be described. Since the conical surface of the guide roller 22 is bulged, it is considered that the slope below the groove 21a of the guide rail 21 is in point contact, and can be represented by a disk including the contact point. FIGS. 6A and 6B are schematic diagrams for analyzing the horizontal force, in which FIG. 6A is a side view, and FIG.

[0010] A force as shown in the figure acts between the guide rail 21 and the guide roller 22. Then, from the relationship between the balance of the vertical and horizontal forces, (1) and (2)
An equation is derived. F ₁ cos θ−μF ₁ sin θ = P (1) F ₁ sin θ−μF ₁ cos θ = F _h (2) where F ₁ is a force perpendicular to the inclined surface of the groove 21 a of the guide rail 21, μ is a friction coefficient, θ Is the groove 2 of the guide rail 21
The angle of inclination of the slope below 1a, P is the vertical force, and _Fh is the horizontal force. (1) and (2) erasing F ₁ from the equation when _{F h = P (sinθ + μcosθ} ) / (cosθ-μsinθ) (3) (3) In the equation, μ = 0.5, When θ = 45 °,
F _h = 3P.

Normally, the guide rail 21 is provided on a horizontal portion between the chain sprocket 14 at the distal end and the chain sprocket 15 at the proximal end. However, since the scraping resistance acts on the bucket 11 even while the chain 12 winds the leading chain sprocket 14, the guide rails 21 as shown in FIG. Is being extended along the pitch circle of the chain sprocket 14 by 1/4 circumference.
In this case, the inclination angle β between the horizontal portion of the guide rail 21 and the upper surface of the bucket 11 can be obtained by equation (4).

Β = sin ⁻¹ (L / 2R) (4) where L is the horizontal distance between the guide roller 22 and the stopper roller 23, and R is the pitch circle radius of the chain sprocket 14. The inclination angle β is between 15 ° and
24 °.

The present invention has been made in view of the above-mentioned problems of the prior art. In any state of the bucket 11, the longitudinal axis 22a of the guide roller 22 does not tilt forward with respect to the guide rail 21. Accordingly, an object of the present invention is to provide a bucket guide device of a continuous unloader in which bending or breakage of the guide rail 21 and the guide roller 22 does not occur.

[0014]

In order to achieve the above object, a bucket guide device of a continuous unloader according to the present invention has an L-shaped scraping portion, and has a large number of buckets for transporting bulk materials. A bucket guide device in a scraping section of a continuous unloader that digs while feeding a scraping section in the lateral direction of a bucket, which is wound around an endless chain, and the inside of the chain along the path of the chain of the scraping section. A pair of guide rails having a V-shaped or trapezoidal groove opened to the side, and a pair of abacus bead-shaped guide rollers attached to the upper front of the bucket and rolling in the groove of the guide rail. And a stopper roller attached to the upper rear of the bucket and abutting against the bottom of the guide rail to prevent the bucket from jumping backward. The vertical axis of over La is inclined to the rear.

The forward inclination angle of the guide roller is preferably 3 ° to 6 ° when the guide rail is only a horizontal portion.

The forward inclination angle of the guide roller is preferably 18 ° to 30 ° when the guide rail has an arc-shaped extending portion on the tip side of the scraping portion in addition to the horizontal portion.

The operation of the present invention will be described below. If the longitudinal axis of the guide roller is tilted backward, the upward displacement component of the guide roller due to the backward tilt of the guide roller shaft will create a gap between the guide roller and the guide rail, so it will be constantly downward. The guide roller receives a downward frictional force along the slope from the guide rail. This reduces the lateral force on the guide roller.

When the horizontal force F _h when the longitudinal axis of the guide roller is tilted backward is calculated in the same manner as that previously calculated using FIG. 6, F _h = P (sin θ−μcos θ) / (cos θ−μ sin θ) (5) In Expression (5), if μ = 0.5 and θ = 45 °,
F _h = P / 3, which is reduced to 1/9 as compared with the case of leaning forward.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side view of a bucket used in the present invention. In the figure, the same parts as those described as the related art are denoted by the same reference numerals, and redundant description will be omitted. As shown in the figure, the longitudinal axis 22a of the guide roller 22 is inclined backward by an angle φ with a path of the chain 12, that is, a perpendicular 26 perpendicular to a horizontal line connecting the tips 24a of the chain mounting portions 24. When the guide rail 21 is a horizontal portion only, the size of φ is such that when the scraping resistance force F acts on the bucket 11 and the stopper roller 23 comes into contact with the bottom surface 21b of the guide rail 21 as shown in FIG. Angle of inclination α of bucket 11
It is sufficient if the angle is slightly larger than (the tilt angle due to the structural clearance). α is 3 ° ~ with a normal continuous unloader
6 °, and therefore φ may be 3 ° to 6 °.

When the guide rail 21 is extended in an arc along the pitch circle of the chain sprocket 14 on the tip side of the scraping section 9 as shown in FIG. 7, the guide roller 22 is moved from the arc to the horizontal section. Bucket 1
1 is inclined by an angle β. Β is 15 ° to 24 ° in a normal unloader. In order to prevent the longitudinal axis 22a of the guide roller 22 from tilting forward with respect to the guide rail 21 at any position of the bucket 11, it is sufficient that φ> α + β (5). Therefore, φ should be in the range of 18 ° to 30 °.

When the longitudinal axis 22a of the guide roller 22 is tilted backward, the upward displacement component of the guide roller 22 creates a gap between the guide roller 22 and the guide rail 21, so that it is stationary. causing a downward slip, the guide roller 22 will be subject to upward frictional force along the slope from the guide rails 21, lateral force F _h of the guide roller 22 is subjected is reduced.

The present invention is not limited to the embodiment described above. For example, the groove 21a of the guide rail 21 may be formed in a V-shape instead of a trapezoidal shape, and various modifications are possible without departing from the gist of the invention. It is.

[0023]

The present invention has a simple structure in which the longitudinal axis of the guide roller attached to the bucket of the continuous unloader is simply tilted backward, while reducing the large horizontal force applied to the guide roller and the guide rail, and reducing the guide roller and the guide. There is an excellent effect that it is possible to prevent breakage and bending of the rail and to prevent accidental stoppage of the unloader.

[Brief description of the drawings]

FIG. 1 is a side view of a bucket of a bucket guide device of a continuous unloader according to the present invention.

FIG. 2 is an elevation view of a continuous unloader.

FIG. 3 is an enlarged elevation view of a scraping section.

4A and 4B are drawings of the bucket guide device, wherein FIG. 4A is a front view and FIG. 4B is a side view.

FIG. 5 is a side view of the bucket guide device during operation.

6A and 6B are schematic views for explaining a problem of the conventional bucket guide device, wherein FIG. 6A is a side view and FIG. 6B is a front view.

FIG. 7 is a side view showing a modified example of the guide rail.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Continuous unloader 9 Scraping part 11 Bucket 12 Chain 21 Guide rail 22 Guide roller 22a Vertical axis of guide roller

Claims (3)

[Claims] An endless chain having an L-shaped scraping section and attached with a number of buckets for transporting loose objects is stretched over, and excavation is performed while sending the scraping section in the bucket side direction. A bucket guide device in a scraping section of a continuous unloader, wherein the pair of bucket guides are provided inside the chain along the path of the chain of the scraping section, and have a V-shaped or trapezoidal groove that opens sideways. A guide rail, a pair of abacus-shaped guide rollers attached to the upper front of the bucket and rolling in the groove of the guide rail, and attached to the upper rear of the bucket and abutted on the bottom of the guide rail, and the It consists of a stopper roller that prevents bouncing up, and the vertical axis of the guide roller is
A bucket guide device for a continuous unloader characterized by being inclined rearward. 2. The backward inclination angle of the longitudinal axis of the guide roller is 3 ° to 6 °.
2. The bucket guide device for a continuous unloader according to claim 1, wherein the angle is in degrees. 3. The rearward inclination angle of the longitudinal axis of the guide roller is 18 °.
A bucket guide device for a continuous unloader that is up to 30 °.