JPS6050515B2 - 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, to particle size control of iron ore in a sizing factory, particle size control of sintered ore in a sintering factory, and sintering in a blast furnace or in front of a furnace. Suitable for use in process control of powder and granular materials where adhesion of moisture is not a major problem, such as control of powder rate and particle size distribution of concretion, multiple sieves with meshes according to particle size and each sieve are stored in a stacked state. The present invention relates to an improvement in a particle size measuring device for powder and granular material, which is equipped with a storage case that vibrates, a support mechanism that supports the storage case in a vibrating state, and a single vibration mechanism that vibrates the storage case during sieving.

Generally, it is required to control the particle size of iron ore in a sizing factory and sintered ore in a sintering factory, and in sintered ore in front of a blast furnace or furnace.
It is required to control the powder ratio and particle size distribution.

Conventionally, as a particle size measuring device for such particle size control, etc., as shown in FIG. An automatic particle size measuring device 10 having weighing hoppers 18, 20, 22, and 24 for weighing the musketeer sample sieved by the sieves 14 and 16 and the under-sieve sample passed through all the sieving machines, respectively, is installed in the analysis room 26. In a process that requires particle size control, a sample 36 for particle size measurement is collected by a sampler 34 at the head of the conveyor 32 transporting the powder and granular material 30, and the sample 36 is transferred to the conveyor. 38 to the analysis room 26 where the automatic particle size measuring device 10 is installed, the sample 36 is introduced into the first stage sieving machine 12 of the automatic particle size measuring device 10, and the sample 36 is sieved by the sieving machine 12. The separated sieved sample is put into the weighing hopper 18 and automatically weighed, and further,
The unsieved sample sieved by the sieving machine 12 is fed into the second stage sieving machine 14, and similarly passes through the third stage sieving machine 16, and each sieved product is transferred to weighing hoppers 20 and 22. In addition, the under-sieve sample that has passed through the third-stage sieve separator 16 is automatically weighed by a weighing hopper 24.
In the figure, 40 is a sample collection conveyor for collecting weighed samples. According to such an automatic particle size measuring device 10, it is possible to continuously and automatically measure the particle size of powder and granular materials, but a sieve and a weighing hopper are required for each particle size classification, which increases the scale of the equipment. Equipment costs are high.
Furthermore, since it is difficult to easily move the automatic particle size analyzer 10 to the nearest location where sampling is performed during the process, the collected samples are transported to the analysis room 26 by the belt conveyor 3.
This had the disadvantage that it had to be transported by truck or truck. On the other hand, there are commercially available batch-type particle size analyzers in which several layers of sieve screens are stacked and sieved using a single vibrating device, and these have the advantage of being compact and having lower equipment costs than continuous types. After sieving, the samples of each particle size category are taken out manually, and then the samples are taken out manually. Therefore, it is necessary to use a measuring device for measurement, which has the disadvantage that it is not possible to automate the process from sieving to weighing.

The present invention was made to solve the above-mentioned drawbacks of the conventional technology, and the equipment cost is low and the device can be easily moved. It is an object of the present invention to provide a particle size measuring device for powder and granular material that is capable of automatic measurement.

The present invention provides a plurality of sieves having meshes according to particle size, a storage case that stores the sieves in a stacked state, a support mechanism that supports the storage case in a vibrating state, and a vibrator that vibrates the storage case during sieving and sorting. In a particle size measuring device for powder and granular materials, which is equipped with a single vibration mechanism, each sieve can be moved horizontally with respect to a storage case, and a fixing mechanism that fixes each sieve to the storage case during sieving. an extrusion mechanism for extruding the sieve in the horizontal direction after sieving is completed; a tip frame provided at the extrusion direction tip of the sieve; and an inversion mechanism for sequentially inverting the extruded sieve and discharging the sample on the sieve. The above object has been achieved by providing a single weighing mechanism for weighing the samples sequentially discharged from each sieve.

Further, the tip frame is opened when the sieve is inverted.

Furthermore, the fixing mechanism also serves as a closing mechanism for the tip frame.

Further, the extrusion mechanism is configured to extrude all the sieves at once and gradually in the horizontal direction.

Furthermore, the inverting mechanism has an inverting pin that is disposed in a protruding position facing a side frame of each sieve in the storage case and having a protruding amount that is sequentially different for each sieve, and that serves as a fulcrum when the sieve is inverted. This is what will happen.

Embodiments of the present invention will be described in detail below with reference to the drawings. Figure 2 is a front view of this embodiment, and Figure 3 is the
4 is a sectional view taken along line -■, FIG. 4 is a side view seen from the direction -■ in FIG. 2, FIG. The figure is a detailed view of the part ■ in Figure 2.
FIG. 7 is a side view seen from the direction ■-■ in FIG. 6, FIG. 8 is a sectional view taken along the line ■-■ in FIG. 6, and FIGS.
The figure is a front view showing each sieve in an inverted state.

As shown in FIG. 2, this embodiment includes a plurality of sieves 50, for example, 5 sieves 50, each having meshes 50a to 50e according to particle size, which become smaller toward the bottom, and a storage case 5 in which each sieve 50 is stored in a stacked state.
2, support fittings 54a to 54d that support the storage case 52 in a vibrating state, and the storage case 5 during sieving.
Drive motor 58, transmission device 60 for vibrating 2
, a single vibration device 5 having a balance weight 62
6, a support roller 64 for supporting the lower part of each sieve 50 is disposed on the inner side surface of the storage case 52, and each sieve 50 is placed in the storage case 5.
2, and as shown in detail in FIG.
is supported by a hinge 68, and the end frame 6 in the extrusion direction is supported by a hinge 68.
6 is opened when the sieve is inverted, and further includes a fixing mechanism 69 which also serves as a closing mechanism for the tip frame 66 in the extrusion direction for fixing each sieve 50 to the storage case 52 during sieving, and A push-out mechanism 82 pushes out all the sieves simultaneously and gradually in the horizontal direction, and the pushed-out sieves are inverted one after another to remove the sample on the sieve. An inverted mechanism 91 for dispensing, a retraction mechanism 95 for retracting and storing the inverted sieve into the storage case 52, and a single weighing mechanism 102 for weighing the samples sequentially dispensed from each sieve 50. .

As shown in detail in FIGS. 6 to 8, the fixing mechanism 69 is rotatably supported by the storage case 52 about a fulcrum 70 for closing the extrusion direction end frame 66 of the sieve 50. A substantially L-shaped claw 72 and a tip of the claw 72
A wire 76 whose rear end is fixed to a pin 74 fixed to the rear end surface 52a of the storage case 52 in the sieve extrusion direction, and a guide roller with double flanges that guides the wire 76. 78 and a guide vibe 80- fixed to the push-out frame 83 of the push-out mechanism 82, and a stopper 81 fixed to the middle of the wire 76.

As shown in FIG. 2, the extrusion mechanism 82 includes an arm 84 fixed to a rear end surface 52a of the storage case 52 in the sieve extrusion direction, and an upper end and an arm 84 that are movable horizontally within the storage case 52. Traveling trolleys 83a, 8 at the lower end
3b is fixed to the extrusion frame 83, and the extrusion frame 83
A power cylinder 86 is disposed between a substantially central portion of the extrusion frame 83 and the arm 84 to move the extrusion frame 83 forward or backward.
and an inverted L-shaped stopper 88 (fifth
(see figure) for pushing out the sieve 50 by pushing out the sieve 50.

As shown in FIGS. 2 and 5, the inversion mechanism 91 includes wing-shaped side guides 92 each having a flap-like tip opening formed on both side frames of each sieve 50, and each sieve 5 of the storage case 52.
The protrusion amount is sequentially different for each sieve facing the side frame 0, and the protrusion amount is larger for the upper sieve. It is composed of inverted pins 93a-e that serve as fulcrums when the sieve is inverted, and a bumper 94 that determines the position of the lowest sieve when it is inverted.

As shown in FIGS. 2 and 4, the drawing mechanism 95 includes a wire 96 whose tip is fixed to the rear end of the sieve 50;
Each sieve 50 is arranged on the rear end surface 52a of the storage case 52 in the sieve extrusion direction and winds up the rear end of the wire 96.
The winding radius of the drum 9 is sequentially changed depending on the length of the wire 96 drawn out depending on the inverted position of the drum 9.
8, a drive motor 100 that rotationally drives the drum 98, a guide roller 101a that guides the wire 96,
101b.

As shown in FIG. 2, the weighing device 102 includes a lower receiving chute 103 for collecting the sample discharged from the inverted sieve 50, a weighing hopper 104, and a weighing hopper 103.
04, a hopper gate 108 for discharging the sample after measurement, a gate opening/closing motor 110 for opening and closing the hopper gate 108, and a hopper gate 108 for discharging the sample after measurement. A sample recovery conveyor 112 for recovering the discharged weighed sample, and a pedestal 114 for supporting each of the above components.
, a current converter 116 for converting the output of the load cell 106 into a transmission signal, and a control panel 118. In FIG. 2, 120 is a sampler, 122 is
This is a sample receiving chute for loading the sample 26 discharged from the sampler 120 onto the sieves 50 stacked in the storage case 52.

The action will be explained below.

First, the drive motor 58 of the vibrating device 56 is rotated to vibrate all the sieves 50 together with the storage case 52, and the sample 36 collected by the sampler 120 is passed through the sample receiving chute 122 and placed in the first place. Sieve screen 5 with large sieve mesh
It is charged onto the sieve 50 at the 7th stage of the first stage lined with Oa and sieved.

After being sieved, samples larger than the sieve mesh remain on the sieve screen 50a, and samples smaller than the sieve mesh fall onto the next sieve screen 50b. Thereafter, the sieving is completed in the same manner when the final sieve screen 50e is reached and no sifting occurs (usually for 2 to 5 minutes). During this sieving, the extrusion frame 83 is maintained in close contact with the rear end surface 52a of the storage case 52 in the sieve extrusion direction, and therefore, as shown by the solid line in FIG. is stretched,
Since the pawl 72 rotates upward about the fulcrum 70 and closes the extrusion direction end frame 66 of the sieve 50 and fixes the front end of the sieve 50, the vibration given by the vibration device 56 is The voltage is reliably applied to each sieve 50, and sieving is performed in the same manner as in the past, and the sample being sieved does not leak out from the tip of the sieve in the extrusion direction. After the sieving is completed, the power cylinder 86 moves the extrusion frame 83 to the second
Push it to the right in the figure until it reaches position X in Figure 6.

Then, the wire 76 becomes slack, and the claw 72 falls downward about the fulcrum 70, as shown by the dashed line in FIG. At this time, the movement of the claw 72 changes depending on the length of the wire 76, the pushing pin 90, and the stopper 88, and the sieve 5
0 may not be released smoothly from the fixed state, but in such a case, for example, as shown in FIG.
By providing this, the claws 72 may be ensured to fall first before the sieve 50 is moved. Also, the claw 72
It is also possible to provide a separate drive for driving the. The sieves 50, which have been released from the fixed state with the storage case 52 by the falling of the claws 72, are pushed by the push-out pins 90 of the push-out frame 83 via the stopper 88, and gradually move forward all at once. . As the sieve 50 moves, the inverted pins 93a to 93e enter the side guides 92 of the 50 sequentially starting from the lower pin, and since the sieve 50 loses its support roller 64, The front side is supported by an inverted pin, and the position of the inverted pin is the center of gravity of the sieve 50! If it exceeds ゛, it will be reversed and become a handstand. At this time, since the protrusion amount of the inverting pins is made to gradually increase from the lower side to the upper side, as shown in FIG. It then stands upside down and stops when it hits the bumper 94. Sieve 50 and bumper 9
Due to the impact of the collision of 4, all the samples in the sieve 50 are
The sample enters the weighing hopper 104 via the lower receiving chute 103, the weight of the sample is detected by the load cell 106, the signal is converted into a current by the current converter 116, and the sample is sent to the control panel 104.
18 is automatically read and stored. When the weighing is completed, the hopper gate 108 of the weighing hopper 104 is opened and the sample is discharged onto the sample collection conveyor 112. After weighing, the power cylinder 86 is driven again to advance all the remaining sieves simultaneously and gradually. Then, as shown in FIG. 10, the second sieve 50 from the bottom is inverted about the inverting pin 93d, and the sample therein is discharged into the weighing hopper 104. At this time, the sieve in the second stage from the bottom stops when it hits the sieve in the lowest stage, so there is no need to provide a dedicated bumper. Note that it is of course possible to set a bumper for each sieve. Thereafter, the same operation is repeated, and when the state shown in Fig. 11, Fig. 12, and Fig. 13 is completed, the weight of each sample on the sieve of the first stage sieve is completed, and the weight of each sample is totaled on the control panel 118. , calculate the percentage of each particle size relative to the total weight, and obtain the particle size distribution. Further, after the measurement of each particle size is completed, the power cylinder 86 is driven in the opposite direction to move the extrusion frame 83 and the claw 72 remains in the falling state. It is moved back to position x in Fig. 6 and stopped. In this state, if the drum 98 of the drawing mechanism 95 is rotated and the wire 96 is drawn in through the guide rollers 101a and 101b and wound around the drum 98, each sieve 50 returns to its original position in the storage case 52. . Thereafter, the power cylinder 86 is further driven to move the extrusion frame 83 to the position Y shown in FIG.
When the wires 76 are moved back to this point, the wires 76 are tensed, the claws 72 are rotated upward, the sieve extrusion direction end frame 66 is closed, and each sieve 50 is fixed to the storage case 52 for the next measurement. Be prepared. In this embodiment, a retracting mechanism 95 for retracting and storing the sieve 50 in an inverted state into the storage case 52 is provided, so that particle size measurement is completely automated.

As explained above, according to the present invention, not only is the equipment cost low, but the device is also easily movable and can be easily installed at the location closest to sampling.

Moreover, measurement can be 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. ■- in Figure 2
4 is a sectional view taken along the line 2, FIG. The figure is a detailed view of the part ■ in Figure 2, and Figure 7 is a side view seen from the ■-■ direction in Figure 6.
FIG. 8 is a sectional view taken along the line ■-■ in FIG. 6, FIGS. 9 to 13 are front views showing the inverted state of each sieve in the above embodiment, and FIG. 14 is a modification of the fixing mechanism. It is a sectional view showing an example. 50...Sieve, 50a-e...Sieve screen, 5
2... Storage case, 52a... Rear end surface in the sieve extrusion direction, 54a-d... Support metal fittings, 56
... Vibration device, 64 ... Support roller, 66.
...Extrusion direction end frame, 68...Hinge, 69...Fixing mechanism, 70...Fully point, 72...Claw, 76... ...Wire, 82...
...Extrusion mechanism, 83...Extrusion frame,
86...Power cylinder, 88...Stopper, 90...Pushing pin, 91...
・Inverted mechanism, 92...Side guide, 93a-
e...Inversion pin, 95...Retraction mechanism, 96...Wire, 98...Drum, 102...Measuring device.

Claims (1)

[Scope of Claims] 1. A plurality of sieves having meshes according to particle size, a storage case that stores the sieves in a stacked state, a support mechanism that supports the storage case in a vibrating state, and a support mechanism that supports the storage case during sieving. In a powder particle size measuring device equipped with a single vibration mechanism that vibrates, each sieve is movable in the horizontal direction relative to the storage case, and in particular, each sieve is fixed to the storage case. a fixing mechanism, a pushing mechanism for pushing out the sieve in the horizontal direction after sieving is completed, a tip frame provided at the tip of the sieve in the pushing direction, and a mechanism for sequentially inverting the pushed out sieve and discharging the sample on the sieve. A particle size measuring device for powder or granular material, characterized in that it is provided with an inverted mechanism and a single weighing mechanism that weighs samples sequentially discharged from each sieve. 2. The particle size measuring device for powder and granular material according to claim 1, wherein the tip frame is configured to be released when the sieve is inverted. 3. The particle size measuring device for powder or granular material according to claim 2, wherein the fixing mechanism also serves as a closing mechanism for the tip frame. 4. Claim 1, wherein the extrusion mechanism is configured to extrude all the sieves at once and gradually in a horizontal direction.
A particle size measuring device for powder and granular materials as described in 2. 5. The inverting mechanism has an inverting pin that is disposed in a protruding position facing a side frame of each sieve in the storage case and having a protruding amount that is sequentially different for each sieve, and that serves as a fulcrum when the sieve is inverted. An apparatus for measuring the particle size of powder or granular material according to claim 1.