JPS6043189B2 - Particle size measuring device for powder and granular materials - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a particle size measuring device for powder and granules, and in particular, for particle size control of iron ore in a sizing factory, particle size control of sintered ore in a sintering factory, and sintering in front of a blast furnace. A plurality of sieve frames each covered with sieve frames having meshes according to particle size, suitable for use in process control of powder and granular materials in which adhering moisture is not a major problem, such as control of powder ratio and particle size distribution of ore, and each sieve frame. A particle size measuring device for powder and granular material, comprising a storage case that stores frames in a stacked state, a support mechanism that supports the storage case in a vibrating state, and a single vibration mechanism that vibrates the storage case. Regarding improvements.

In general, it is required to control the particle size of iron ore in a sizing factory, sintered ore in a sintering factory, and the powder ratio and particle size distribution of sintered ore in front of a blast furnace. are required to be managed.

Conventionally, as a particle size measuring device for such a particle size tube sulfur, etc., as shown in FIG. , 14, and 16, and weighing hoppers 18, 20, 22, and 24 for weighing the under-sieve samples that have passed through all the sieving machines, respectively, are installed in an analysis room. 26, the conveyor 3 transporting the granular material 30 in a process that requires particle size control.
2, a sample 36 for particle size measurement is collected by a sampler 34, and the sample 36 is conveyed by a conveyor 38 to an analysis room 26 where an automatic particle size measurement device 10 is installed. The sample 36 is placed in the first stage sieving machine 12.
The sample on the sieve that has been sieved by the sieve separator 12 is fed into the weighing hopper 18 and automatically weighed, and the sample under the sieve that has been sieved by the sieve separator 12 is passed through the second sieve. It is fed into the separator 14, and then similarly passed through the third stage sieve 16.
Each sieved product is passed through weighing hoppers 20 and 22 and
The under-sieve sample that has passed through the sieve separator 16 in the first stage is transferred to the weighing hopper 24.
Therefore, each item is automatically weighed. In the figure, 40 is a sample collection conveyor for collecting weighed samples. Such automatic particle size measuring device 10
According to this method, the particle size of powder and granular materials can be continuously and automatically measured, but a sieve and a weighing hopper are required for each particle size classification, which increases the size of the equipment and the equipment cost.

Furthermore, since it is difficult to easily move the automatic particle size measuring device 10 to the nearest location where sampling is performed during the process, the collected samples are transferred to the belt conveyor 3 until the analytical value is 26.
This had the disadvantage that it had to be transported by truck or truck. On the other hand, batch-type particle size measuring devices are also commercially available, in which several stages of sieve frames with meshes for different particle sizes are stacked and sieved using a single vibrating device, and they have the advantage of being compact and having lower equipment costs than continuous-type devices. However, after sieving, it is necessary to manually take out samples of each particle size category and then manually measure them using a measuring device, making it impossible to automate the process from sieving to weighing. It had the following drawback.

The present invention has been made in order to eliminate the above-mentioned conventional drawbacks, and provides a particle size measuring device for powder and granular materials that has low equipment costs, is easy to move, and is capable of fully automatic measurement. With the goal.

The present invention provides a plurality of sieve frames each covered with a sieve screen having a fine particle size mesh, a storage case that accommodates each sieve frame in a stacked state, a support mechanism that supports the storage case in a vibratory state, and In a powder particle size measuring device equipped with a single vibration mechanism that vibrates a storage case, one end of each sieve frame is swingably supported by the storage case, and the other end of each sieve frame is supported by the storage case. An opening/closing gate for discharging the sample is provided, and furthermore, during sieving, each sieve frame is supported in a horizontal state and the opening/closing gate is locked in a closed state.On the other hand, when discharging a sample, each sieve frame is supported horizontally and opened/closed. A locking mechanism for sequentially releasing the unlocked state of the gate starting from the lowest stage, a tilting mechanism for tilting the lowest sieve frame and returning it to the horizontal state, and the tilting mechanism and the locking mechanism The above object is achieved by providing a single weighing mechanism that sequentially weighs the samples discharged from each sieve frame that is sequentially tilted from the lower stage side. Further, the opening/closing gate has a gate plate whose center of gravity is shifted downward and is pivotably supported on the other end of the sieve frame.

Further, a horizontal part is formed at the lower end of the gate plate, and is flush with the horizontal support part on the lower surface of the sieve frame when the gate is closed, and a single locking mechanism can horizontally support the sieve frame and lock the opening/closing gate. It was designed to be done at the same time.

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

Fig. 2 is a front view of this embodiment, and Fig. 3 is -
4 is a perspective view showing the sieve frame used in this example and the support structure for the sieve frame, and FIG.
Similarly, FIG. 6 is a perspective view showing the opening/closing gate of the sieve frame, FIG. 6 is a perspective view similarly showing the locking mechanism, and FIG. 7 is a sectional view taken along the line ■-■ in FIG. 6.

In this embodiment, as shown in FIGS. 2 and 3, a sieve screen 54 or a bottom plate 59 having meshes classified by particle size that become smaller toward the bottom is used.
A storage case 60 that stores a plurality of, for example, five, sieve frames 50a to 50e in a stacked state, and a support fitting 62a that supports the storage case 60 in a vibrating state. 62d, a single vibration device comprising a drive motor 66, a belt 68, a V-pulley 70, a drive shaft 72, a shaft support 74, and an unbalanced weight 76 for vibrating the storage case 60. 64, as shown in detail in FIG. The sieve frames 50a to 50e are rotatably supported by
At the other end, as shown in detail in FIG. 5, the center of gravity is shifted downward by triangular wings 86 fixed to both ends, and the sieve frame is pivotably supported by a pin 88 at the top of the other end of the sieve frame. A gate plate 8 in which a horizontal portion 86a is formed on the lower end surface of the triangular blade 86 and is flush with the horizontal support portion 52 on the lower surface of the sieve frame when the gate is closed.
Furthermore, during sieving, each sieve frame is supported in a horizontal state, and the gate plate 84 is locked in a closed state.On the other hand, when discharging a sample, each sieve frame is A locking mechanism 9 for sequentially releasing the frame horizontal support state and the closed locked state of the gate plate 84 from the lowest stage side.
The tip of a rod 100a is rotatably connected to the bottom plate 59 of the lowermost sieve frame 50e for tilting the lowermost sieve frame 50e on which the bottom plate 59 is stretched and returning it to a horizontal state. , the cylinder 100b is the base 60b of the storage case 60.
a tilting cylinder device 100 rotatably supported by;
A single weighing device 10 that sequentially weighs samples discharged from each of the sieve frames 50a to 50e, which are sequentially tilted from the lowest stage side by the tilting cylinder device 100 and the locking mechanism 90.
2.

Among the sieve frames 50a to 50e, the lowest sieve frame 50e
As shown in detail in FIG. 4, the other sieve frames 50a to 50d are covered with a sieve screen 54 using a presser plate 56, which has meshes according to particle size that become smaller toward the bottom. Presser plate 5
A corner plate 58 is disposed above 6.
In addition, the bottom sieve frame 50e has a bottom plate 59 instead of a sieve screen.
is stretched. The storage case 60 has an open end face on the sample delivery side of the sieve frame or both end faces.

The four supporting metal fittings 62a to 62d are arranged to constitute a parallel link mechanism, and are configured to swing while bearing the load of the storage case 60. Further, the vibrating device 64 and the storage case 60 are arranged such that the center of the storage case 60 and the center of the drive shaft 72 of the vibrating device 64 are approximately 10 to 30 mm apart.
The drive shaft 72 is connected with an eccentricity of about w0n.
When rotated, due to the unbalanced weight 76,
The storage case 60 is configured to move circularly within a plane.

As shown in detail in FIGS. 6 and 7, the lock mechanism 90 includes a substantially L-shaped lock lever 94 rotatably supported by a pin 92 on the side frame 60c of the storage case 60;
By moving one end of the lock lever 94 in the vertical direction in the figure, the other end of the lock lever 94 supports each sieve frame in a horizontal state and locks the gate plate 84 in a closed state, or locks each sieve frame in a closed state. horizontal support state and gate plate 84
a locking electromagnetic cylinder 96 disposed on the side frame 60c of the storage case 60 for releasing the closed lock state;
Stoppers 9 and 8 are fixed to the side frame 60c of the storage case 60 for regulating the stop position of the lock lever 94.
It has the following.

This locking mechanism 90 is disposed on both side surfaces of each sieve frame, or at a portion facing one side surface. The weighing device 102, as shown in FIG. 2, a lower receiving chute 104 for collecting the sample taken out from each sieve frame which is sequentially tilted from the lowest stage side by the tilting cylinder device 100 and the locking mechanism 90. , a weighing hopper 106, a load cell 108 for measuring the weight of the sample accommodated in the weighing hopper 106, a hopper gate 110 for discharging the sample after measurement, the hopper gate 110, and the hopper gate 110. Gate opening/closing motor 1 for opening/closing
12, a sample recovery conveyor 114 for recovering the weighed sample delivered from the hopper gate 110, a current converter 116 for converting the output of the load cell 108 into a transmission signal, and a computer 118. It is configured.
In FIG. 2, 120 is a sampler, 122 is a sample receiving chute for charging the sample 36 discharged from the sampler 120 into the input port 60d formed in the upper part of the storage case 60, and 124 is a support for the sieving machine. Metal fittings 62a to 62d
and a sieving machine base 126 for supporting the shaft support part 74 of the vibration device 64, for supporting the sample receiving chute 122, the lower receiving chute 104 of the weighing device 102, the load cell 108, the gate opening/closing motor 112, etc. It is a pedestal. The action will be explained below.

First, all the sieve frames 50a to 50e are set in a horizontal state, and each gate plate 84 is locked in the closed state, and the drive motor 66 of the vibration device 64 is rotated to remove all the sieve frames together with the storage case 60. 50a to 50e are vibrated, and the sampler 120
The sample 36 collected is introduced through the sample receiving chute 122 from the input port 60d of the storage case 60 onto the first stage sieve frame 50a having the largest sieve mesh, and is sieved.

After being sieved, samples larger than the sieve mesh remain on the sieve frame 50a, and samples smaller than the sieve mesh fall onto the next sieve frame 50b. Thereafter, in the same manner, the sample reaches the sieve frame 50e at the lowest stage, and sieving is completed when sieving no longer occurs (usually within 2 to 5 minutes). After sieving is completed, the bottom sieve frame 50e
The locking electromagnetic cylinder 96 is driven, and the locking lever 9
4 to the position shown by the broken line in FIG.
The horizontal support state of the sieve frame 50e and the closed locked state of the gate plate 84 of the sieve frame 50e are released.

After that, the tilting cylinder device 100 is driven and the eighth cylinder device 100 is driven.
As shown in the figure, the lowest sieve frame 5 is unlocked.
Only the sample 0e is tilted downward about the shaft 80 to discharge the sample in the sieve frame 50e and lead it into the weighing hopper 106 of the weighing device 102 via the lower receiving chute 104. In this state, the weight of the sample is detected by the load cell 108, the signal is converted into a current by the current converter 116, and the weight of the sample is detected by the computer 118.
automatically read and memorize. When weighing is completed, the hopper gate 110 of the weighing hopper 106 is opened and the sample is discharged onto the sample collection conveyor 114. Next, the locking electromagnetic cylinder 96 of the second sieve frame 50d from the bottom is driven to bring the sieve frame 50d into a horizontally supported state and the gate plate 8 of the sieve frame 50d.
When the closed lock state of 4 is released, the sieve frame 50d falls and tilts downward about the shaft 80, as shown in FIG. 9, and the sample in the sieve frame 50d is taken out and calculated.

Thereafter, the same operation is repeated, and after the states shown in FIGS. 10 and 11 are completed, as shown in FIG. 12, when the weighing of the first stage sieve frame 50a is completed, the weight of each is added up using the calculator 118, The weight percentage of each particle size with respect to this total weight is calculated to determine the particle size distribution of the entire sample. Further, after completing the measurement for each particle size, the tilting cylinder device 100 is driven in the opposite direction, and each sieve frame 50a to 50a is in the state shown in FIG.
50e is returned to the horizontal state as shown in FIG.

Next, the locking electromagnetic cylinder 96 of each sieve frame is driven,
By returning the lock lever 94 to the position shown by the solid line in FIG. 7, each sieve frame is supported in a horizontal state, and the gate plate 84 is locked in the closed state in preparation for the next measurement.
In this embodiment, the opening/closing gate has a gate plate 84 whose center of gravity is shifted downward and is pivotally supported on the other end of the sieve frame, so that the opening/closing operation of the gate is It is done quickly, reliably, and efficiently.

Note that the configuration of the opening/closing gate is not limited to this. Further, in this embodiment, a horizontal portion 86a is provided at the lower end of the gate plate 84, which is flush with the horizontal support portion 52 on the lower surface of the sieve frame when the gate is closed.
With a single locking mechanism,
Horizontal support of the sieve frame and closing and locking of the opening/closing gate are performed in the same manner.

Note that the closing/locking mechanism of the opening/closing gate is not limited to the above embodiment, and a locking mechanism separate from the horizontal support mechanism of the sieve frame may be provided independently. As explained above, according to the present invention, not only the apparatus is made compact and the equipment cost is low, but also the apparatus is easily moved and can be easily installed at the nearest location to be sampled.

Also, the measurements are fully automated. Furthermore, it has excellent effects such as short analysis time and the ability to use data for feedback control of processes.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an example of a conventional automatic particle size measuring device, FIG. 2 is a front view showing an embodiment of the particle size measuring device for powder and granular materials according to the present invention, and FIG. FIG. 2 is a sectional view taken along line 1--2 in FIG. FIG. 6 is a perspective view of the gate, FIG. 6 is a perspective view of the locking mechanism, FIG. 7 is a cross-sectional view taken along line 1-1 in FIG. 6, and FIGS. A cross-sectional view showing the operating state. 36...Sample, 50a-50e...Sieve frame, 52...Horizontal support part, 54...Sieve screen, 5
9...Bottom plate, 60...Storage case, 62
a to 62d... Support metal fittings, 64... Vibration device, 80... Shaft, 82... Bearing, 8
4...Gate plate, 86...Triangular wing, 86
a...Horizontal part, 88...Pin, 90...
...Lock mechanism, 94...Lock lever, 96
・・・・・・Electromagnetic cylinder for lock, 100・・・・・・
Tilting cylinder device, 102...Measuring device.

Claims (1)

[Claims] 1. A plurality of sieve frames each covered with a sieve screen having meshes according to powder size;
Particle size measurement of powder and granular material comprising a storage case that stores each sieve frame in a stacked state, a support mechanism that supports the storage case in a vibrating state, and a single vibration mechanism that vibrates the storage case. In the apparatus, one end of each sieve frame is swingably supported by the storage case, and an opening/closing gate for discharging the sample is provided at the other end of each sieve frame, and each sieve frame is held in a horizontal state during sieving. and lock the opening/closing gate in the closed state, while for sample discharging, a locking mechanism is provided to sequentially release the horizontal support state of each sieve frame and the closed locked state of the opening/closing gate from the lowest side. Tilt the lower sieve frame,
Further, a tilting mechanism for returning to a horizontal state, and a single weighing mechanism that sequentially weighs the samples discharged from each sieve frame that is sequentially tilted from the lowest stage side by the tilting mechanism and the locking mechanism; A particle size measuring device for powder or granular material, characterized in that it is provided with: 2. The particle size of the powder or granular material according to claim 1, wherein the opening/closing gate has a gate plate whose center of gravity is shifted downward and is pivotally supported on the other end of the sieve frame. measuring device. 3. A horizontal portion is formed at the lower end of the gate plate and is flush with the horizontal support portion of the sieve frame surface when the gate is closed, and a single locking mechanism simultaneously horizontally supports the sieve frame and locks the opening/closing gate. An apparatus for measuring the particle size of powder or granular material according to claim 2.