JPH11128841A - Roller type sifting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a material to be treated from being caught between rollers and from being reversely rotated to clog the roller clearance. SOLUTION: Large diameter rollers 12 and small diameter rollers 13 are alternately arranged. The surface height of the small diameter roller 13 is made lower than that of the large diameter roller 12 one away on the upstream side. On the surface of the large diameter roller 13, projections 12a are provided to enlarge frictional resistance of the surface. In this way, by the difference between the peripheral velocities of the large and small diameter rollers, the material to be treated that falls from the large diameter roller falls on the downstream side from the axial center of the small diameter roller, and force by which the small diameter roller is about to push the material to be treated into the clearance between 1 he rollers is made smaller than that by which the large diameter roller is about to raise the material to be treated from the clearance between the rollers, thereby preventing the material to be treated from being caught in the clearance between the rollers and from being reversely rotated to clog the roller clearance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roller-type sieving apparatus, for example, when the size and processing amount of an object exceeds the processing capability of a vibrating screen, or when the object is processed by a dump truck or the like. The present invention relates to a roller-type sieving apparatus which is suitable for directly charging the sieving apparatus.

[0002]

2. Description of the Related Art In a crushing plant for mountain quarrying, a plant for treating waste concrete and earth and sand generated in construction work, and a crushing plant for slag generated in metal refining, a process for crushing an object to be treated and sieving it. Before the crushing, first, a treatment (hereinafter, referred to as “preliminary sieving”) for removing large lumps, metal lumps, large pieces of wood, and the like that may cause a trouble in the crushing step is performed.

[0003] In these plants, a preliminary sieving apparatus is installed at the uppermost step, and the object to be treated is usually directly input to the preliminary sieving apparatus by a dump truck. Therefore, the preliminary sieving apparatus must be able to withstand the impact when the object to be processed is loaded from the dump truck, and to be capable of sieving large lumps and metal lumps.

Therefore, a vibrating screen, which is a general sieving apparatus, cannot be used for the preliminary sieving apparatus.
A bar type fixed grizzly 1a as shown in FIG.
A sieving apparatus provided with a grid-type fixed grizzly 1b as shown in (b) or a tilting grizzly 3 tilted by a hoisting machine 2 as shown in FIG. 4 is used. The tilting grizzly 3 also has a bar type and a lattice type. In addition, 4 in FIG. 4 is a sieve hopper, 5 is a belt conveyor that conveys a mass below the sieve, and 6 is a mass above the sieve.

[0005] However, when a fixed grizzly or a tilting grizzly is used as the above-mentioned preliminary sieving device, the object to be processed is accumulated on the grizzly, so that continuous processing is impossible. Therefore, usually, it is necessary to perform an operation of removing the processing object accumulated on the grizzly every time the processing object is received from the dump truck. In both the fixed type and the tilting type, the bar-type grizzly has less blockage than the lattice-type grizzly, but has a poor sieving efficiency because a long object to be processed passes through.

As a device capable of continuous processing and having high sieving efficiency, there is a sieving device called a roller screen as shown in FIG. In this sieving apparatus, the roller 7 is rotated by a motor (not shown), and sieving is performed while transferring an object to be processed to the downstream side. The sieving apparatus has relatively little clogging.

[0007]

However, the conventional roller-type sieving apparatus has the following disadvantages and has not been widely used. That is, in the conventional roller-type sieving apparatus, as shown in FIG. 6, the workpiece 8a sufficiently larger than the interval between the rollers 7 is transferred downstream of the apparatus by the rotation of the rollers 7. In addition, the workpiece 8b that is sufficiently smaller than the distance between the rollers 7 falls from the gap between the rollers 7 and is sieved.

However, in the case of the workpiece 8c which is slightly larger than the distance between the rollers 7, the workpiece 8c is transported downstream.
Bites into the gap between the rollers 7. At this time, the processing object 8c
If the material is brittle, the object to be treated is crushed by the roller 7. However, if the material is not easily crushed like metal, the driving device of the roller 7 is damaged, and the device stops. Trouble occurs.

On the other hand, if the object to be processed is slightly larger and does not bite into the roller 7, the object to be processed 8d is not transferred in a reverse rotation between the two rollers 7, so that
Blockage occurs. Japanese Patent Publication No. 63-31266 discloses a roller 7 provided with a projection to prevent this blockage. In this case, the projection exerts a force to bite the workpiece into the gap between the rollers. Is not very realistic.

[0010] The present invention has been made in view of the problems of the above-described conventional roller-type sieving apparatus,
It is an object of the present invention to provide a roller-type sieving apparatus that can prevent a processing object from being caught between rollers and blockage due to reverse rotation of the processing object between rollers.

[0011]

In order to achieve the above-mentioned object, a roller-type sieving apparatus of the present invention arranges large-diameter rollers and small-diameter rollers alternately and reduces the surface height of the small-diameter rollers by one. The surface height of the large-diameter roller on the upstream side is set lower than that of the large-diameter roller.
The large-diameter roller and the small-diameter roller are arranged so as to be located downstream from the axis of the small-diameter roller. In this way, if the large-diameter roller and the small-diameter roller are rotated in the same direction, and, for example, at the same rotation speed, the workpiece to be dropped from the large-diameter roller due to the difference in the peripheral speed of the roller becomes a small-diameter roller. The force that the large-diameter roller attempts to lift from the roller gap is greater than the force that falls down from the axis of the roller and the small-diameter roller pushes the workpiece into the gap between the rollers. In addition, it is possible to prevent the processing object from being caught in the roller gap and to prevent the processing object from being blocked by reverse rotation.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The roller-type sieving apparatus of the present invention arranges large-diameter rollers and small-diameter rollers alternately, and makes the surface height of the small-diameter roller larger than the surface height of the large-diameter roller on one upstream side. The large diameter roller and the relation that the parabolic trajectory when the processing object moves to the small diameter roller downstream of the large diameter roller is located downstream from the axis of the small diameter roller. The small-diameter roller is arranged, and if necessary, the frictional resistance of the surface of the large-diameter roller is increased, the frictional resistance of the surface of the small-diameter roller is reduced, and the vertical tangent on the downstream side of the large-diameter roller is The large-diameter roller and the small-diameter roller are arranged so as to be located at the same position as the axis of the small-diameter roller arranged on the downstream side or on the downstream side from the axis.

According to the roller type sieving apparatus of the present invention, when the large-diameter roller and the small-diameter roller are rotated in the same direction and at the same rotational speed, the object to be processed that falls from the large-diameter roller due to a difference in peripheral speed of the roller. Is larger than the force that the large diameter roller tries to lift from the roller gap, rather than the force that falls down from the axis of the small diameter roller and pushes the workpiece into the gap between the rollers. growing. Therefore, the processing object bites into the roller gap,
The roller gap is not closed due to reverse rotation.

At this time, if the frictional resistance of the surface of the large-diameter roller is increased and the frictional resistance of the surface of the small-diameter roller is reduced, the object to be processed which has fallen downstream from the axis of the small-diameter roller is pushed into the gap between the rollers. Thus, the difference between the force to be lifted and the force to lift is increased, so that it is possible to more effectively prevent the processing object from biting into the roller gap or closing the roller gap by reverse rotation.

Further, if the large-diameter roller and the small-diameter roller are arranged such that the vertical tangent line on the downstream side of the large-diameter roller is located on the downstream side with respect to the axis of the small-diameter roller disposed on the downstream side, the object to be processed can be obtained. Even when the material to be processed cannot be dropped between the large-diameter roller and the downstream small-diameter roller due to the difference in the peripheral speed of the rollers, as in the charging position when the In addition, the object does not fall between the small-diameter roller and the large-diameter roller on the upstream side, so that the object does not bite into the roller gap or reversely close the roller gap.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A roller sieving apparatus according to the present invention will be described below with reference to one embodiment shown in FIGS. FIG. 1 is a schematic diagram showing the overall configuration of the roller-type sieving apparatus of the present invention, and FIG. 2 is an explanatory diagram of the sieving mechanism of the roller-type sieving apparatus of the present invention.

1 and 2, reference numeral 11 denotes a roller-type sieving apparatus of the present invention. As shown in FIG. 2, a large-diameter roller 12 having projections 12a on its surface, and projections and the like provided on its surface. The small-diameter rollers 13 are alternately arranged such that the surface height of the small-diameter roller 13 is lower than the surface height of the large-diameter roller 12.

In this embodiment, as shown in FIG.
The vertical tangent A on the downstream side of the large-diameter roller 12 is
The large-diameter roller 12 and the small-diameter roller 13 are located at the same position as the axis of the small-diameter roller 13 arranged on the downstream side.
Has been arranged.

The large-diameter roller 12 and the small-diameter roller 13 rotate the output shaft of the motor
The workpiece 18 transmitted through the sprocket 16 and rotated, for example, at the same rotational speed in the direction of transporting the workpiece 18 loaded from the dump truck 17 to the downstream side (the right side in the drawing of FIG. 1). In addition, 19 in FIG. 1 is a sieve hopper, 20 is an upper sieve hopper, 21 is a belt conveyor for conveying the lower sieve mass 18a or the upper sieve mass 18b, and 22 in FIG.
The collar provided at a constant pitch in the longitudinal direction of the large-diameter roller 12 is shown.

The workpiece 18 placed in the roller-type sieving apparatus 11 of the present invention is sieved to a target size in the process of being transferred to the downstream side. Diameter roller 12 and small diameter roller 13
Is determined by the interval. Hereinafter, a mechanism of sieving the workpiece 18 that has been input into the roller-type sieving apparatus 11 of the present invention will be described with reference to FIG.

As described above, the large-diameter roller 12 and the small-diameter roller 13 in the roller-type sieving apparatus 11 of the present invention are arranged such that the vertical tangent A on the downstream side of the large-diameter roller 12 is the small-diameter roller disposed on the downstream side. 13 is located at the same position as the axis of the small-diameter roller 12, the workpiece 18 that falls from the large-diameter roller 12 surely falls downstream from the axis of the small-diameter roller 13, and the small-diameter roller 13 and the large-diameter roller 1 on the downstream side.
2 is sieved.

Here, the workpiece 18 (the undersize sieve 1) is smaller than the gap between the small-diameter roller 13 and the large-diameter roller 12 on the downstream side.
8a) shows the small-diameter roller 13 and the large-diameter roller 1 on the downstream side.
2, the object 1 to be processed is larger than the distance between the small-diameter roller 13 and the large-diameter roller 12 on the downstream side.
8 (on-sieve mass 18b) is transported downstream on the roller.

In the above-mentioned sieving, the vertical tangent line A on the downstream side of the large-diameter roller 12 is located at the same position as the axis of the small-diameter roller 13 arranged on the downstream side or on the downstream side. It is the same even if it is not. For example, when the rollers rotate in the same direction at the same number of rotations, the workpiece 18 falling from the large-diameter roller 12 having a large peripheral speed
Draws a parabola and falls downstream from the axis of the small-diameter roller 13, and the small-diameter roller 13 and the large-diameter roller 1 on the downstream side
This is because sieving is performed between the two.

At this time, the difference in the peripheral speed between the small diameter roller 13 and the large diameter roller 12 on the downstream side causes the small diameter roller 13
Is higher than the force that pushes the workpiece 18 into the gap between the small-diameter roller 13 and the downstream large-diameter roller 12, rather than the force that tries to lift the workpiece 18 from the gap between the small-diameter roller 13 and the downstream large-diameter roller 12. As a result, it becomes possible to prevent the processing object 18 from being caught in the roller gap or to be blocked by the reverse rotation of the processing object 18.

At the time of the above-mentioned sieving, as in this embodiment,
The protrusion 12a is provided on the surface of the large-diameter roller 12 to increase the frictional resistance, while the frictional resistance is reduced without providing the protrusion on the surface of the small-diameter roller 13; The difference in the lifting force becomes larger, and the processing object 18 bites into the roller gap,
Blockage due to reverse rotation of the workpiece 18 can be more effectively prevented.

In the present embodiment, the protrusion 12a is provided on the surface of the large diameter roller 12 to increase the frictional resistance. However, instead of the protrusion 12a, the frictional resistance is increased by making the surface rough. May be.

In this embodiment, the large-diameter roller 12 and the small-diameter roller 13 are rotated at the same rotation speed.
2 may be increased to further increase the difference in peripheral speed.

In this embodiment, the large-diameter roller 12 and the small-diameter roller 13 are arranged such that the vertical tangent A on the downstream side of the large-diameter roller 12 is located at the same position as the axis of the small-diameter roller 13 disposed on the downstream side. Place the large diameter roller 1
2, regardless of the peripheral speed difference between the small-diameter roller 13 and the small-diameter roller 13, the processing object 18 does not bite into the roller gap or does not rotate to close the roller gap. As described above, even if the vertical tangent line A is not located downstream of the axis of the small-diameter roller 13 disposed on the downstream side, the vertical tangent A is affected by the difference in peripheral speed between the large-diameter roller 12 and the small-diameter roller 13 as described above. It is possible to prevent the processing object 18 from biting into the roller gap or closing the roller gap due to reverse rotation.

The large-diameter roller 12 and the small-diameter roller 1
Needless to say, if a cooling medium passage is provided in the inside of the container 3 and the cooling medium is supplied to the passage, the sieving process can be performed even in the high-temperature object 18 or in a high-temperature atmosphere. No.

[0030]

As described above, according to the roller type sieving apparatus of the present invention, the object to be dropped from the large-diameter roller is located downstream of the axis of the small-diameter roller due to the difference in the peripheral speed of the roller. The force that the large-diameter roller attempts to lift from the gap between the rollers is greater than the force that the roller drops and the small-diameter roller pushes the workpiece into the gap between the rollers. Of the roller and the reverse rotation to close the roller gap can be effectively prevented.

At this time, if the frictional resistance on the surface of the large-diameter roller is large and the frictional resistance on the surface of the small-diameter roller is small, the difference between the above-mentioned force for pushing and the force for lifting becomes larger. It is possible to more effectively prevent the processing target from being caught in the roller gap and clogging due to reverse rotation of the processing target.

Further, if the large-diameter roller and the small-diameter roller are arranged so that the vertical tangent line on the downstream side of the large-diameter roller is located on the downstream side with respect to the axis of the small-diameter roller disposed on the downstream side, the object to be processed can be obtained. Even when the material to be processed cannot be dropped between the large-diameter roller and the downstream small-diameter roller due to the difference in the peripheral speed of the rollers, as in the charging position when the In addition, the object does not fall between the small-diameter roller and the large-diameter roller on the upstream side, and the object does not bite into the roller gap or reversely close the roller gap.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing the overall configuration of a roller type sieving apparatus of the present invention.

FIG. 2 is an explanatory view of a sieving mechanism of the roller sieving apparatus of the present invention.

FIG. 3A is a perspective view of a bar-type fixed grizzly,
(B) is a perspective view of a grid type fixed grizzly.

FIG. 4 is a schematic explanatory view of a sieving apparatus provided with a tilting grizzly.

FIG. 5 is a schematic explanatory view of a roller screen.

FIG. 6 is a diagram showing a mechanism of sieving a roller screen and a problem.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Roller type sieving apparatus 12 Large diameter roller 12a Projection 13 Small diameter roller 18 Workpiece

Claims (4)

[Claims] 1. A roller-type sieving method wherein large-diameter rollers and small-diameter rollers are alternately arranged, and the surface height of the small-diameter roller is lower than the surface height of one large-diameter roller on the upstream side. apparatus. 2. A large-diameter roller and a small-diameter roller are arranged such that a parabolic trajectory when an object moves to a small-diameter roller downstream of the large-diameter roller is located downstream of the axis of the small-diameter roller. A roller-type sieving apparatus characterized in that: 3. The roller-type sieving apparatus according to claim 1, wherein the frictional resistance on the surface of the large-diameter roller is large, and the frictional resistance on the surface of the small-diameter roller is small. 4. The large-diameter roller and the small-diameter roller are arranged such that a vertical tangent line on the downstream side of the large-diameter roller is located at the same position as the axis of the small-diameter roller disposed downstream or on the downstream side of the axis. Claim 1 characterized by being arranged
4. The roller-type sieving apparatus according to any one of 3.