JPH0394139A - Automatic measuring device for powder particle size - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to an automatic measuring device for powder particle size, which can accurately, quickly and easily measure powder particle size, and which can be used as a particle size control means. Regarding automatic measuring equipment.

[Prior art] This automatic measuring device for grain size of rice powder has already been published in Japanese Patent Application Laid-open No. 1983
- Disclosed in Publication No. 18H34.

That is, the powder is sieved by feeding it to a sieve machine with a plurality of different meshes arranged flat on the sieve frame, the bottom of the sieve screen is sent to a weighing machine and weighed, and then the sieve size is sieved. Remove the partition provided on the sieve screen, move the top of the sieve to a sieve with a coarser mesh, sieve with that sieve, and send the bottom of the sieve to a weighing machine for weighing. The powder particle size is automatically measured by calculating the measured values of the sieve mesh and the sieve bottom of each mesh using a controller. As another technique, an automatic granule particle size measuring device that combines a multistage vibrating sieve, a weighing machine, and a microcomputer controller is also available on the market.

[Problem to be Solved by the Invention] However, in the above-mentioned conventional automatic powder particle size measuring device, the sieving operation is performed using a sieving machine having a plurality of meshes arranged horizontally and arranged in a plane. However, there is a problem in that the area occupied by automatic measurement of powder size increases, and in addition, control means for setting and changing the sieving time and changing the opening/closing time of the partitions are required. Moreover, the above parameters have been sufficiently considered even though they need to be changed due to changes in powder physical properties, powder particle size, supply amount, etc. Therefore, this device is not suitable for particle size control. Although it can be used, there is a problem in that it lacks functionality to be used for particle size control.

In addition, in the case of another conventional technique, sieving and extraction are performed in parallel, and although it can be applied to granulated products with relatively uniform particle shapes, for crushed products, the powder that should originally pass through is mixed with silk products. There was a problem with the amount of waste being emitted.

The present invention solves these conventional problems,
Powder particle size measurement is automated by controlling the operation control for sieving each stage of powder to be measured, taking out the sieved powder, and calculating the powder weight. , and the powder is taken out by the opening/closing means in which each of the above-mentioned operation ties are set, thereby preventing the occurrence of measurement errors, accurately and easily measuring, and providing an excellent automatic measurement of powder size that can be used as a particle size control means. The purpose is to provide a device.

[Means for Solving the Problems] In order to achieve the above object, the present invention uses a vibrating sieve consisting of a framed round sieve arranged in multiple stages, an oscillator having a vertical axis equipped with an unbalanced weight, and a vibrating sieve for each stage. an opening for taking out the sieved powder on each sieve, and an outlet having an opening/closing means for sequentially opening and closing the openings for each stage;
A weighing machine for adding and weighing the weight of the classified powder is provided in the conduit for guiding the powder from the outlet, and
Immediate operation means that operates at a set time after starting sieving of powder; operation means that opens and closes the opening/closing means for each stage based on the operation of the immediate operation means; and classified materials discharged from the sieve by opening and closing the operation means. A weighing machine that stores the powder in a receiving material and measures its weight, an operating means that operates a turning means that rotates the receiving material 180 degrees about the horizontal axis after the measurement is completed, and each of the above-mentioned means in sequence. and an arithmetic processing device that operates to calculate the powder particle size, and further includes a partition plate that rotates across the powder particle size that sequentially operates the opening/closing means of the extraction port, Also,
The oscillator is equipped with means for adjusting the phase difference of the unbalanced weight of the oscillator.

[Function] The present invention has the following effects due to the above configuration. In other words, the powder to be measured is sieved by each stage of the vibrating sieve, and the powder on the sieve mesh is sequentially guided into the guide channel from the outlet using an opening/closing means, and the weight of the classified powder is measured by a weighing machine. It is possible to obtain a particle size distribution corresponding to the opening size of the sieve mesh by weighing and calculating, and since the above operations are controlled by a calculation processing device, it is possible to accurately, quickly and easily determine the particle size of the powder. Automatic measurements can be taken.

Since the opening/closing means of the outlet is rotated by the partition plate in a manner transverse to the flow direction of the powder flowing on the sieve screen, the powder can be surely and easily flowed to the opening.

Furthermore, since the unbalanced weight of the oscillator can be adjusted to create a phase difference, the powder flow motion on the sieve screen is forced to match the properties of the powder, ensuring powder discharge. By doing so, the accuracy of automatic measurement of powder particle size can be further improved.

[Embodiment] FIGS. 1 to 3 show the structure of an embodiment of the present invention. In FIGS. 1 to 3, lO indicates an automatic measuring device, which is composed of a vibrating sieve l2, a meter f The sieves 1646° are arranged in multiple stages, for example, in two stages, and the opening dimensions of the round sieves 16, 18' are gradually made finer from the upper stage to the lower stage. 20.20° indicates a tapping ball receiving plate, and round sieve screens 16.18° are placed on the sieve frame 14 in multiple stages, allowing the ball to pass under each sieve screen. A cleaning tapping ball 1717° of sieve net 1δ and 16° is pushed into the gaps between the round sieve 16 and the tapping ball receiving plate 20, and between the round sieve 16° and the tapping ball receiving plate 20′. The operation is being carried out reliably.

An oscillator 30 is attached to the bottom of the sieve frame 14, and has a vertical shaft 22 in the center, and unbalanced weights 24 and 28 are attached above and below the vertical shaft 22, respectively.

28 indicates a boule provided at the lower end of the vertical shaft 22;
It is provided in a driving means, for example, an electric motor 34, and is rotationally driven via a bobbin 32 and a belt means 3l. 33 denotes a sieve stand, which elastically supports the sieve frame 4. Also,
Reference numeral 40 indicates a base, and a cushioning material 3B is inserted between the sieve base 33 and the base 40 to prevent vibrations caused by the movement of the vibrating sieve l2 from being transmitted to the base 40.

A powder sample to be measured by the automatic measuring device 10 is supplied from a supply port 18 at the top of the sieve frame 14.

At this time, it is preferable to use a supply device, which is not shown. Vibrating sieve 12 by rotation of drive means 34
Due to the vibration of the sieve frame 14, the powder sample is sorted into the lower portion of the sieve screen that has passed through the 16.16° sieve of each stage and the upper portion of the sieve screen that has not passed through the screen.
42° and 42″.

The outlet 42 corresponds to the top of the sieve screen of the sieve 16, the outlet 42° corresponds to the bottom of the sieve 16 and above the sieve screen of the sieve 16°, and the outlet 42'' corresponds to the bottom of the sieve 16'. Yo &: It is something that has been established.

FIG. 2 shows details of the outlet 42 in the upper stage of the vibrating screen 12. An outlet 42 is provided on the outside of the sieve frame 4, and 52 is an opening that serves as an inlet of the outlet 42. The opening 52 can be opened and closed by an opening/closing means 53, 54 is a partition plate, and 56 is a hinge member provided at the end of the partition plate. Reference numeral 58 indicates a guide member provided at the center of the partition plate 54, and is provided with, for example, a groove. A pin member 62 is slidably inserted into the guide member 58.

Reference numeral 60 indicates a pressure cylinder provided above the sieve mesh 16, and a rod 64 of the pressure cylinder 60 is connected to the bottle material 6.
2, and the other end of the pressure cylinder 60 is supported by a pedestal 68 provided on the sieve frame 14 via a connecting member 66. The pressure cylinder 60 allows pressure fluid to enter and exit from an inlet and exit port (not shown) to move the lot 64 and rotate the partition plate 54 around the hinge 56 with a predetermined opening degree.
For example, the opening 52 can be opened by rotating the partition plate 54 as indicated by a double line, and the opening 52 can be closed as indicated by a solid line. Arrow A indicates the powder flow direction on the surface of the sieve screen 16, and the opening/closing means 53
is sequentially rotated according to the particle size of the powder, allowing the powder to smoothly flow into the outlet 42 and be taken out.

FIG. 3 shows the outlet ports 42 in each stage of the vibrating sieve l2.
42°, 42” and corresponding opening/closing means 53,
53".53" respectively.

Outlet port 42 of each stage. The openings 42' and 42° are displaced with a slight distance from each other, so that the powder can be removed from the respective outlet 42. 42', 42"
This allows for smooth flow and removal.

The openings of the outlets 42, 42°, 42°' and the outlet at the other end are arranged on a straight line, and the guide path 43 is connected through the respective connecting members 42a, 42b, 42c as shown in FIG. are gathered and connected to the outlet 42.
The classified powder taken out from 42° and 42″ is passed through the conduit 43
At the same time, the powder is stored in a receiving material 46 provided in a hopper part 45 at the lower part of the conduit 43, and connected to a weighing machine 50, for example, a funnel cell, via a turning means 48 attached to the receiving material 46. Then, the weight of the powder contained in the receiving material 46 is measured by the weighing machine 50 together with the receiving material 46, the turning means 48, the fixture, and the like.

It is possible to connect a calculation IA processing device 70 to the weighing machine 50, and the weight detection value of the weighing machine 50 is processed by the calculation processing device 7.
Data processing including addition calculation is performed in the arithmetic processing circuit via the zero detection circuit, and the calculation result is displayed on the display unit, and the output signal from the control operation unit is used to record the movement procedure of the automatic measuring device 10, etc. can be regulated and automatic measurement of the optimum powder particle size can be reliably repeated.

In the above, sequential operations can be controlled using a logic sequence that can be programmed in combination with semiconductor logic, a personal computer, or the like.

The detailed configuration of the automation device 70 described above is as shown below. The sieving operation of the powder to be measured is performed by an electric motor 34.
The sieving of the powder is completed after a preset period of time has elapsed under the rotation of The input signal is inputted to an operating means provided in the fluid circuit, for example, a switching valve. The turning means 48 attached to the receiving material 46 is, for example, a step motor or the like, and accommodates the classified powder and transfers it to the weighing machine 50.
For example, the measurement is performed using a load cell, and after the measurement data has stabilized, a measurement end signal is outputted, and the measurement is completed.The signal is manually inputted to an operating means for operating the turning means 48, such as a switchgear. There is.

Next, the operation of the above embodiment will be explained. In the above embodiment, the opening/closing means 53, 53°, 53'' of the outlet ports 42, 42°, 42'' of each stage are operated by the output signal of the arithmetic processing unit 70 to close the opening/closing means 53, 53°, 53'', respectively, to remove the powder sample. Classification is performed by a sieving operation by supplying from the supply port 18.
6 and 1B' mesh size range, and each group is classified into each group with 16 mesh size or less. The arithmetic processing device 70
The opening/closing means 53 is rotated to open the opening 52 by the operation of the time-limited operation means 11 1 2 in which the set time is commanded from to open and close the opening 52 by rotating it in the opposite direction.
The above-mentioned powder is stored in a receiving material 46 and weighed by a weighing machine 50. Waiting for the end of weighing due to stabilization of the weighing data, the turning means 48 is operated to turn the received material 46 and move it to the hopper 4.
After the powder is discharged from 5, the turning means 48 is reversely operated to return the receiving material 46 to its normal position. Next, the opening/closing means 53'' is rotated to open the opening 52'' and the powder on the sieve screen of the 16° sieve is taken out, and then the opening/closing means 53'' is rotated in the opposite direction to close the opening 52''. , the above powder is received as a material 46
and weighed by a weighing machine 50. Thereafter, substantially the same operations as above are performed, and the same sequence of operations is repeated for the powder under the 16° sieve screen.

In the above, the setting value of the sieving time and the time setting for rotating the opening/closing means can all be set arbitrarily based on a program. The above setting values are determined in advance by considering the properties of the powder to be processed.
The parameters are determined by preliminary processing or the like to obtain the optimum parameters.

In addition, when setting the sieving time, when sieving is performed using multiple sieves, the sieve that takes the longest time to complete sieving is used as the standard, so the sieving time for all sieves is has ended.

In addition, opening/closing means 53 for each stage. 53°, 5 3
After measuring the accumulated weight each time the classified powder is stored in the receiving material by sequentially opening and closing the ``, the receiving material 46 containing the accumulated powder is turned and the powder is discharged from the hopper 45. It is also possible to return the receiving material 46 to its home position.

As mentioned above, each time the powder is stored in the receiving material 46 after the sieving of the powder is completed, the weight of the stored powder is measured by the weighing machine 50, and the weight of the stored powder is measured by the calculation processing in the calculation processing unit 70. The weight of the classified powder, the total weight of the supplied powder, the particle size distribution, the particle size characteristic number, the average particle size, etc. are calculated, and the calculation results are displayed on the display section. The above operations are performed based on human output signals from the control operation section.

[Effects of the Invention] As described above, according to the present invention, the sample powder can be classified into each stage by driving the vibrating sieve, and the classified powder can be sequentially taken out by the opening/closing means under the control of the arithmetic processing unit. Then, the weight is measured by a weighing machine, and the calculation IA such as the particle size distribution of the sample powder is performed by the above calculation process.
The particle size measurement procedure and apparatus are simple, and accurate and rapid automatic measurement is possible.

In addition, the partition plate 58 of the opening/closing means for the outlet is guided in a shearing shape across the direction of the powder flow flowing on the surface of the sieve screen, so that the powder flow to the opening is ensured and easy. The body flow can be reliably interrupted, and the operation of the device and automatic measurement of powder particle size can be ensured.

Furthermore, since the unbalanced weight of the oscillator can be adjusted to create a phase difference, the powder flow motion on the sieve screen is forced to match the properties of the powder, thereby classifying the powder. This can further improve the accuracy of automatic measurement of powder particle size.

Furthermore, the apparatus and particle size measurement procedure are simplified, and the powder particle size can be automatically measured accurately and quickly. These functions allow it to be used as an on-line particle size control means in pulverization operations, etc., and have the practical effect of ensuring the stability of the pulverized product particle size.

[Brief explanation of drawings]

Fig. 11 is an overall configuration diagram of an automatic powder particle size measuring device according to an embodiment of the present invention, Fig. 2 is a detailed view of the main parts of the device, and Fig. 3 is a layout diagram of the opening/closing means for the outlet of the device. It is. 10... Automatic measuring device 12...
... Vibrating sieve l4... Sieve frame 1
6,18"... Sieve net 22... Vertical axis 24.28... Balance weight 15 16 30... Oscillator 42, 42°.42゜ ゜ ・ ・ Exit 43 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Measuring machine 52 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・・・・・・・・・・Partition plate

Claims (4)

[Claims] (1) A vibrating sieve consisting of a round sieve with a frame arranged in multiple stages and an oscillator with a vertical axis equipped with an unbalanced weight, an opening for taking out the powder on the sieve mesh screened in each stage, and each of the above It is characterized by comprising an outlet having an opening/closing means for sequentially opening and closing the openings of each stage, and a weighing machine for measuring the weight of the classified powder in a conduit that guides the powder from the outlet. Powder particle size automatic measuring device. (2) A time-limited operation means that operates at a set time after the start of sifting the powder, an operation means that opens and closes the opening/closing means for each stage based on the operation of the time-limited operation means, and a control means for opening and closing the opening/closing means for each stage based on the operation of the time-limited operation means; a weighing machine for storing the classified powder in a receiving material and measuring its weight; an operating means for operating a turning means for rotating the receiving material by 180 degrees about the horizontal axis after the measurement is completed; 2. The automatic measuring device for pulverized particle size according to claim 1, further comprising an arithmetic processing device for calculating the powder particle size by sequentially operating each means. (3) The automatic powder particle size measuring device according to claim 1, wherein the opening/closing means for the outlet comprises a partition plate that rotates across the powder flow direction. (4) The automatic powder particle size measuring device according to claim 1, further comprising means for adjusting the phase difference of the unbalanced weight of the oscillator.