JP2016078015A - Oscillation sieve device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oscillation sieve device capable of being stably operated for a long term.SOLUTION: An oscillation sieve device 1 applies rotational motion to a crank shaft 4 by reciprocating motion of a shaft 5 by rotation of a crank 6 by rotation of a motor 8, thereby the crank shaft 4 rotates and applies oscillation motion to an inclined screen 2, for performing screening by using a trajectory which rebounds on the inclined screen 2, in which the trajectory is varied according to shapes of matters to be sieved and difference of hardness of the matters.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an oscillating sieve device used for removing fine particles adhering to the surface of a massive iron-making raw material (for example, iron ore (lump ore), sintered ore, coal, coke, etc.).

  The lump ore, which is a raw material for iron making, is usually stored in piles in the raw material yard. Therefore, at the time of rain, the lump ore gets wet and fine iron ore having a particle size of 5 mm or less adheres to the surface of the lump ore having a particle size of 5 to 50 mm, for example. When the lump ore is charged into the blast furnace in this state, the average particle size of the lump ore becomes small, and the ventilation resistance in the furnace increases, so the productivity decreases.

  Therefore, a blast furnace charging pretreatment for removing fine particles of 5 mm or less adhering to the surface of the lump ore is performed before charging the lump ore into the blast furnace.

  Conventionally, the following methods are disclosed as a method for removing fine particles (adhered fine particles) adhering to the surface of the lump ore.

  For example, Patent Document 1 proposes a method for removing adhering fine particles by washing a massive ore with water.

  In addition, a method for removing fine particles adhering to the lump ore using a vibration sieve device has been proposed. The vibration sieving apparatus removes adhering fine particles under the sieving mesh while moving the sieving object on the sieving mesh by vibrating the sieving mesh at a half amplitude of several mm and a vibration of several hundred Hz or more.

  However, the method of removing the adhering fine particles by washing the block ore described in Patent Document 1 uses a large amount of water, and equipment such as a thickener or a filter press is used for water treatment after the adhering fine particles are removed. In addition, since it is not possible to send the wet ore that has been washed with water and directly to the blast furnace, a heat source facility for drying the wet ore is required.

  Moreover, the method of removing the fine particles adhering to the lump ore using the vibration sieve device has the following problems. That is, as described above, the lump ore is stored in the raw material yard in a piled state, so that the surface of the lump ore is wet during the rain and the attached fine particles are sticky. In this state, when the vibration sieving device is used, the attached fine particles are easily clogged with the sieve, and the removal efficiency of the attached fine particles is lowered.

  On the other hand, Patent Document 2 proposes a method of removing fine particles adhering to the lump ore using a swinging screen device (swinging repulsive sorting machine). It is said that the fine particles adhering to the lump ore can be efficiently removed by using the oscillating sieve device.

  Oscillating sieve device (oscillating repulsive type sorter) is an up-down direction while reciprocating in an inclined direction by an eccentric drive mechanism (crankshaft etc. eccentrically decentered by a certain amount) with respect to an inclined screen (sieving screen inclined at a certain angle). This is a form selection device that makes a selection by utilizing the fact that the trajectory repelling on the inclined screen is different depending on the shape and hardness of the object to be sieved by performing an oscillating motion (oscillating motion).

  FIG. 10 shows an example of an oscillating sieve device used in Patent Document 2. As shown in FIG. 10, the swing sieve device 91 includes an inclined screen 92, a screen mount 93, and an eccentric drive mechanism (a crankshaft 94, a chain 95, a motor rotating shaft 97, and a motor 98).

Japanese Patent Laid-Open No. 07-113127 International Publication WO2013 / 179609

  However, as shown in FIG. 10, in the oscillating sieve device 91 used in Patent Document 2, the crankshaft 94 is connected and driven by a chain 95. Tension fluctuation (extension / contraction) occurs in the chain 95 due to the influence of shaft runout or the like. Accordingly, when the chain 95 is operated continuously for a long time, the tension fluctuation (extension / contraction) of the chain 95 continuously occurs, so that the chain 95 is frequently damaged or replaced, and the operating rate of the oscillating sieve device 91 is increased. There is a problem that it is greatly reduced.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide an oscillating sieve device that can operate stably for a long period of time.

  In order to solve the above problems, the present invention has the following features.

  [1] An oscillating sieve device that oscillates an inclined screen by an eccentric drive mechanism, and as an eccentric drive mechanism, a motor as a drive source, a motor rotation shaft, a crank installed on the motor rotation shaft, and an inclination An oscillating sieve device comprising: a crankshaft that imparts oscillating motion to a screen; and a shaft that connects the crank and the crankshaft.

  [2] The above-mentioned [1], wherein a plurality of crankshafts are provided on one side and the other side in the width direction of the inclined screen, and the plurality of crankshafts on each side rotate synchronously. Oscillating sieve device.

  [3] The swing according to [1] or [2], wherein a phase difference is provided between a crankshaft on one side and a crankshaft on the other side in the width direction of the inclined screen. Sieve device.

  [4] An oscillating sieve device that oscillates an inclined screen by an eccentric drive mechanism. The eccentric drive mechanism is connected to a motor that is a drive source, a motor rotating shaft, and a motor rotating shaft, and is used as an inclined screen. An oscillating sieve device comprising: an eccentric rotating shaft that imparts an eccentric motion; and a slide support mechanism that supports the inclined screen in a state in which the inclined screen can be reciprocated in the conveying direction and the vertical direction of the sieve.

  [5] The swing sieve device according to [4], wherein the slide support mechanisms are installed at a plurality of locations.

  [6] The oscillating sieve device according to any one of [1] to [5], which is used for removing fine particles adhering to the massive iron-making raw material.

  The swing sieve device according to the present invention can operate stably for a long period of time.

It is a perspective view which shows Embodiment 1 of this invention. It is a top view which shows Embodiment 1 of this invention. It is a front view which shows Embodiment 1 of this invention. It is a side view which shows the movement of the lump ore in Embodiment 1 of this invention. It is a perspective view (perspective view) which shows Embodiment 2 of this invention. It is a top view which shows Embodiment 2 of this invention. It is a side view (perspective view) showing Embodiment 2 of the present invention. It is a front view which shows Embodiment 2 of this invention. It is a figure which shows the adhesion powder removal effect in the Example of this invention. It is a figure which shows a prior art.

  Embodiments of the present invention will be described with reference to the drawings.

[Embodiment 1]
1 to 3 show an oscillating sieve device (oscillating repulsive sorter) according to Embodiment 1 of the present invention. FIG. 1 is a perspective view, FIG. 2 is a top view, and FIG. 3 is a front view. is there. In addition, here, it demonstrates in mind using using when removing the microparticles | fine-particles (attached microparticles | fine-particles) adhering to the surface of the lump ore.

  As shown in FIGS. 1 to 3, the oscillating sieve device 1 according to the first embodiment of the present invention uses an eccentric drive mechanism to incline an inclined screen (a sieve screen inclined at a constant angle) 2 installed on a screen mount 3. As an eccentric drive mechanism, the motor 8 is a drive source, the rotation shaft (motor rotation shaft) 7 of the motor 8, the crank 6 installed on the motor rotation shaft 7, and a fixed amount A. A crankshaft 4 that is eccentric and imparts a swinging motion (an operation that vibrates up and down while reciprocating in the tilting direction) to the inclined screen 2, and a shaft 5 that connects the crank 6 and the crankshaft 4 are provided.

  That is, in the swing sieve device 1, when the crank 6 is rotated by the rotation of the motor 8, the shaft 5 reciprocates to give the crankshaft 4 a rotational motion, whereby the crankshaft 4 rotates and moves. By imparting a swinging motion to the inclined screen 2, a form selection device is selected that makes use of the fact that the trajectory repelling on the inclined screen 2 is different depending on the shape and hardness of the object to be sieved.

  As shown in FIG. 4, when an object to be sieved (here, lump ore 10 and attached fine particles 11) is put into such a rocking sieve device 1, as shown in FIG. Among the rotations, in the upper half of the rotation, the object to be sieved is lifted and jumped upward by the movement of the inclined screen 2. At this time, the agglomeration ores 10 are agitated and collided with each other, and the attached fine particles 11 adhering to the surface of the ore 10 are shaken off. Further, as shown in FIG. 4B, in one rotation of the crankshaft 4, when the lower half of the crankshaft 4 rotates, the lump ore 10 bounced up falls on the inclined screen 2, and the lump ore 10 Further, the adhered fine particles 11 on the surface of the lump ore 10 are wiped off by the collision with the inclined screen 2. Thereafter, the lump ore 10 is conveyed in a downwardly inclined direction along the inclination of the inclined screen 2. The removed adhered fine particles 11 fall through the mesh of the inclined screen 2.

  As described above, in the conventional swing sieve device 91 shown in FIG. 10, the crankshaft 94 is connected by the chain 95, so that the chain 95 is affected by the minute vibration of the crankshaft 94 itself or the influence of shaft runout. As a result, tension fluctuation (extension / contraction) of the chain 95 occurs continuously when it is operated continuously for a long time, so that the chain 95 is frequently damaged or replaced. There has been a problem that the operating rate of the swing sieve device 91 is greatly reduced.

  On the other hand, in the oscillating sieve device 1 according to the first embodiment of the present invention, instead of the power transmission to the crankshaft 94 by the chain 95, the crankshaft 4 and the crank 6 installed on the motor rotating shaft 7 are connected. Since the shaft 5 is connected to transmit power to the crankshaft 4, minute vibrations and shaft runout of the crankshaft 4 itself are absorbed by the crank 6, so that the shaft 5 is damaged. Therefore, it is possible to apply a stable rotational motion to the crankshaft 4 and to operate stably for a long time.

  In the first embodiment, the direction in which the inclined screen 2 is inclined is defined as the longitudinal direction of the inclined screen 2, and the direction orthogonal to the longitudinal direction is defined as the width direction of the inclined screen 2. Two crankshafts 4 (4a and 4b in FIGS. 1 and 2) are provided on one side, and two crankshafts 4 (4c and 4d in FIGS. 1 and 2) are provided on the other side. The two crankshafts 4 (4a and 4b, 4c and 4d) on the same side rotate in synchronization with each other as a set.

  This is because if the crankshafts 4 positioned on the same side in the width direction of the inclined screen 2 do not rotate synchronously and a phase difference occurs, the inclined screen 2 may not be able to smoothly reciprocate in the inclined direction.

  However, the crankshaft 4 (4a, 4b) on one side in the width direction of the inclined screen 2 and the crankshaft 4 (4c, 4d) on the other side are rotated with a phase difference. Also good.

  When the crankshafts 4a and 4b and the crankshafts 4c and 4d rotate in the same phase, the crankshafts 4a and 4b and the crankshafts 4c and 4d reach dead center at the same time. This is to avoid the possibility of stopping if the force is weak.

  Here, the phase difference between the crankshafts 4a, 4b and the crankshafts 4c, 4d is less effective if it is too small, and if it is too large, the posture of the inclined screen 2 becomes unstable. About 30 ° is preferable.

  In some cases, instead of the above, two crankshafts 4 (4a and 4c in FIGS. 1 and 2) on one side in the longitudinal direction of the inclined screen 2 and two crankshafts on the other side 4 (4b, 4d in FIGS. 1 and 2), the two crankshafts 4 (4a and 4c, 4b and 4d) on the same side rotate in synchronism with each other as a set. Good.

  At that time, the crankshaft 4 (4a, 4c) on one side in the longitudinal direction of the inclined screen 2 and the crankshaft 4 (4b, 4d) on the other side are rotated with a phase difference. It may be.

  The inclined screen 2 can be either a punched plate or a comb, and can be selected regardless of the shape. The material can be made of steel, resin, or rubber, but a rubber screen reinforced with a hard rubber or soft rubber with a resin cloth is excellent in wear resistance, impact resistance, and powder peelability. It is more preferable.

  Moreover, it is preferable that the inclined screen 2 has a 5-15 mm sieve so that the adhesion fine particle 11 of 5 mm or less adhering to the lump ore 10 can be removed efficiently. That is, since most of the adhered fine particles 11 adhering to the lump ore 10 are as fine as 5 mm or less, the mesh may be 5 mm or more.

  Thus, in the swing sieve device 1 according to the first embodiment, the crankshaft 4 and the crank 6 installed on the motor rotary shaft 7 are connected by the shaft 5, so that the conventional swing Compared to the case where the crankshaft 94 is connected by the chain 95 as in the sieving device 91, it becomes possible to impart a stable rotational motion to the crankshaft 4, and it is possible to operate stably for a long period of time.

  In the first embodiment, two crankshafts 4 are provided on each side of the inclined screen 2 in the width direction. However, in the present invention, one crankshaft 4 is provided on each side of the inclined screen 2 in the width direction. The same can be applied to the case where the crankshaft 4 is provided, or to the case where three or more crankshafts 4 are provided on each side in the width direction of the inclined screen 2.

  Moreover, in this Embodiment 1, although it is keeping in mind to remove the adhesion fine particles 11 adhering to the lump ore 10, the present invention is applied to the surface of sintered ore, coal, coke, etc., which are other lump iron-making raw materials. The present invention can be similarly applied to the case of removing attached fine particles (for example, attached fine particles having a particle size of 5 mm or less).

  Furthermore, the present invention can be applied to the case of sorting using the fact that the trajectory repelling on the inclined screen is different depending on the shape and hardness of the object to be sieved.

[Embodiment 2]
5 to 8 show an oscillating sieve device (oscillating repulsive sorter) according to Embodiment 2 of the present invention, FIG. 5 is a perspective view (perspective view), FIG. 6 is a top view, and FIG. Is a side view (perspective view), and FIG. 8 is a front view.

  As shown in FIGS. 5 to 8, the oscillating sieve device 21 according to the second embodiment of the present invention uses an eccentric drive mechanism to incline the inclined screen (screen mesh inclined at a constant angle) 22 installed on the screen mount 23. As an eccentric drive mechanism, the motor 26, which is a drive source, a motor rotary shaft 25, and a motor rotary shaft 25 are connected to the tilt screen 22 as an eccentric drive mechanism. An eccentric rotating shaft 24 that gives a motion that vibrates in the vertical direction while reciprocating, and a slide support mechanism 32 that supports the inclined screen 22 in a state in which the tilted screen 22 can be reciprocated (reciprocated) in the vertical direction. ing.

  The slide support mechanism 32 reciprocates in the sieve transport direction while being supported by the sieve transport direction slide shaft bearing 29 attached to the fixed base 27 and the sieve transport direction slide shaft bearing 29. Moving (reciprocating slide) slide object transport direction slide shaft 28, vertical slide shaft bearing 31 attached to the screen pedestal 23, and sieve object transport direction slide shaft 28 attached to the vertical slide shaft A vertical slide shaft 30 is provided that reciprocates in the vertical direction (reciprocating slide) while being supported by the bearing 31.

  In other words, the swing sieve device 21 is configured such that the eccentric rotary shaft 24 rotates eccentrically through the motor rotary shaft 25 by the rotation of the motor 26 and imparts a swing motion to the inclined screen 22. The form sorting device sorts using the fact that the trajectory repelling on the inclined screen 22 varies depending on the difference in hardness.

  The swing sieve device 21 includes a sieve transport direction slide shaft 28 supported by a sieve transport direction slide shaft bearing 29 and a vertical slide shaft 30 supported by a vertical slide shaft bearing 31. Since the eccentric rotation shaft 24 is eccentrically rotated, the sieve material transport direction slide shaft 28 and the vertical slide shaft 30 are respectively sieving material transport direction slide shaft bearings 29. By being reciprocated in the up-and-down direction (reciprocating slide) in the up-and-down direction while being supported by the up-and-down slide shaft bearing 31, a stable swinging motion can be imparted to the inclined screen 22.

  As described above, in the conventional swing sieve device 91 shown in FIG. 10, the crankshaft 94 is connected by the chain 95, so that the chain 95 is affected by the minute vibration of the crankshaft 94 itself or the influence of shaft runout. As a result, tension fluctuation (extension / contraction) of the chain 95 occurs continuously when it is operated continuously for a long time, so that the chain 95 is frequently damaged or replaced. There has been a problem that the operating rate of the swing sieve device 91 is greatly reduced.

  On the other hand, in the oscillating sieve device 21 according to the second embodiment of the present invention, instead of power transmission from the chain 95 to the crankshaft 94, the motor rotating shaft 25 connected to the motor 8 is connected to the eccentric rotating shaft 24. In addition to performing power transmission, the sliding support mechanism 32 supports the swinging motion of the tilt screen 22, so that the tilting screen can perform stable swinging motion without being affected by minute vibrations or shaft swings of the eccentric rotating shaft 24. 22 can be provided, and can operate stably for a long time.

  The slide support mechanisms 32 are preferably installed at a plurality of locations (for example, 4 locations as shown in FIGS. 5 and 6).

  As an example of the present invention, the attached fine particles 11 adhered to the lump ore 10, which is a pretreatment for charging a blast furnace, were removed.

  At that time, as Example 1 of the present invention, the attached fine particles 11 were removed from the lump ore 10 using the oscillating sieve device 1 (FIGS. 1 to 3) according to Embodiment 1 of the present invention described above. A phase difference of 5 ° was given between the crankshafts 4a and 4b and the crankshafts 4c and 4d.

  Further, as Example 2 of the present invention, the attached fine particles 11 were removed from the lump ore 10 using the oscillating sieve device 21 (FIGS. 5 to 8) according to Embodiment 2 of the present invention described above.

  On the other hand, as a comparative example, the attached fine particles 11 were removed from the lump ore 10 using the above-described conventional rocking sieve device 91 (FIG. 10).

  And in each case, it was made to operate for 6 months and the average value of the operation rate of each month was made into the operation rate for 6 months. In addition, the operation rate of each month was calculated | required by ((the operation days of the said rocking sieve apparatus of each month / total number of days of each month) x100). The result is shown in FIG.

  As shown in FIG. 9, in Example 1 of the present invention, the operation rate for 6 months is about 95%, and in Example 2 of the present invention, the operation rate for 6 months is as high as about 98%. The adhered fine particles 11 could be removed stably.

  On the other hand, in the comparative example, the number of working days decreased due to chain replacement, inspection work, etc., and the operating rate for 6 months was only about 85%.

  This confirmed the effectiveness of the present invention.

DESCRIPTION OF SYMBOLS 1 Oscillating sieve device 2 Inclined screen 3 Screen mount 4 Crankshaft 4a-4d Crankshaft 5 Shaft 6 Crank 7 Motor rotating shaft 8 Motor 10 Lump ore 11 Adhering fine particles 21 Oscillating sieve device 22 Inclined screen 23 Screen mount 24 Eccentric rotating shaft 25 Motor Rotating Shaft 26 Motor 27 Fixing Base 28 Sliding Shaft Transport Direction Slide Shaft 29 Bearing Shaft Transporting Direction Slide Shaft Bearing 30 Vertical Slide Shaft 31 Vertical Slide Shaft Bearing 32 Slide Support Mechanism 91 Oscillating Sieve Device 92 Tilt Screen 93 Screen mount 94 Crankshaft 95 Chain 97 Motor rotating shaft 98 Motor

Claims (6)

  An oscillating sieve device that oscillates an inclined screen by an eccentric drive mechanism. As an eccentric drive mechanism, a motor as a drive source, a motor rotating shaft, a crank installed on the motor rotating shaft, and an inclined screen An oscillating sieve device comprising: a crankshaft that imparts dynamic motion; and a shaft that connects the crank and the crankshaft.   The swing screen according to claim 1, wherein a plurality of crankshafts are provided on one side and the other side in the width direction of the inclined screen, and the plurality of crankshafts on each side rotate synchronously. apparatus.   3. The oscillating sieve device according to claim 1, wherein a phase difference is provided between a crankshaft on one side in the width direction of the inclined screen and a crankshaft on the other side.   An oscillating sieve device that oscillates an inclined screen by an eccentric drive mechanism. The eccentric drive mechanism is connected to a motor that is a drive source, a motor rotating shaft, and a motor rotating shaft, and performs an eccentric movement on the inclined screen. An oscillating sieve device comprising: an eccentric rotating shaft to be applied; and a slide support mechanism that supports the inclined screen in a state in which the inclined screen can be reciprocated in the direction of conveying the object to be sieved and the vertical direction.   5. The swing sieve device according to claim 4, wherein the slide support mechanism is installed at a plurality of locations.   The oscillating sieve device according to any one of claims 1 to 5, wherein the oscillating sieve device is used for removing fine particles adhering to the massive iron-making raw material.

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