JP3049473B2 - Sieving equipment for potter's earth - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to sieving prior to crushing a pottery for use in the manufacture of ceramic products such as tiles, tiles and bricks by a crusher such as a roll crusher. The present invention also relates to a ceramic sieving apparatus for roughing and medium crushing. As the raw soil used for ceramic products, a material obtained by removing foreign substances contained in the raw soil in advance or crushing a hard lump of clay and grinding it is adopted. Therefore, this step is performed in the order of sieving, coarse grinding, medium grinding, and grinding, but the present invention relates to a pretreatment device for grinding.

[0002]

2. Description of the Related Art In recent years, with the depletion of pottery ground, pottery ground containing foreign matters such as stones and hard clay lumps has to be used. Therefore, in the past, generally, the steps of crushing, medium crushing, and crushing were performed separately by a primary roll crusher and a secondary roll crusher, and the sieving process before crushing was performed with relatively high quality. In the case of fine soil and containing little foreign matter, the foreign matter on the belt conveyor in operation, for example, is removed manually while being carried into the primary roll crusher, and the crushing and medium crushing are immediately performed. Was omitted and transported to a crusher such as a secondary roll crusher, where the crushing treatment was performed.

[0003] On the other hand, in the case of the original soil having a relatively large amount of foreign substances, the sieving process is performed manually as described above, and the original soil is crushed (coarse) by a crusher such as a primary roll crusher. Crushing and medium crushing), and then carry the crushed material to a crushing machine such as a secondary roll crusher for grinding.

[0004] In addition, when the content ratio of foreign matters and the like is high, the operation of the roll crusher and the belt conveyor is temporarily stopped, and the work is often performed.

[0005] Therefore, there is a problem that not only is the operation complicated, but also foreign matter gets into the rolls of the roll crusher and damages the roll crusher.

However, despite these problems, as far as the inventor knows, no effective solution has yet been developed. As a prior art adjacent to this type of apparatus, Japanese Unexamined Patent Publication No.
There is an invention described in 4-73355. The invention described in this publication relates to a device for screening remaining soil generated at a road construction site or a building foundation construction site, thereby sifting the soil mass and foreign matter for reuse.

According to the above-mentioned prior art invention, the sieving surface is formed with openings by projecting sieving bars at right angles to the rotating shaft at regular intervals on the rotating shaft. When the tip of the rotating blade is exposed between the bars, the remaining material is sent to the hopper while being sieved by the movement of the sieving bar. Dropped and sieved bar
When a foreign substance having a lump diameter larger than the size of the opening comes, the foreign substance can be discharged separately without being crushed.

[0008]

The problem to be solved by the present invention is that, when the foreign matter discharging means is manually operated, the work is complicated, and the foreign matter is removed between the rolls of the roll crusher. And damage the roll crusher.

Further, in the case of the invention described in Japanese Patent Application Laid-Open No. 54-73355, it is difficult to form a lump of raw earth, stone, or hard clay having extremely uneven properties and high viscosity or containing moisture. In sieving, the sieving bar and the rotating blades are driven in a complex manner.
However, during the work, the original soil is subjected to the combined movement of the sieving bar and the rotating blades. However, the original soil to be carried in is merely thrown into the sieving bar. And the like are not agitated or dispersed on the sieving bar, so that it cannot be avoided that the sieving bar and the rotating blades are filled in a deposited state, so that clogging may still occur on the sieving surface. There was a problem that could not be avoided.

[0010] Further, coarse and medium crushing is performed by rotating blades provided above the sieving surface, and the original soil that has passed through the rotating blades is not subjected to subsequent coarse or medium crushing and remains as a foreign substance. Because of the discharge, the effect of coarse and medium crushing is insufficient, and there has been a problem that the original soil cannot be used efficiently.

In addition, there is no solution for overloading the sieving bar or the like caused by foreign matter or the like being cut between the sieving bar and the rotating blades.

Therefore, an object of the present invention is to carry out mechanical sieving, crushing and medium crushing simultaneously, and to omit at least a primary crushing step using a primary roll crusher or the like. Is extremely uneven and has high viscosity and high moisture content, so stones, coarse and medium crushing are not possible without frequent clogging on the sieving surface during sieving. The purpose of this project is to efficiently screen hard chunks of clay and crush the original soil to make effective use of the original soil.

It is a further object of the present invention to provide a solution to an overload caused when foreign matter or the like enters between the slit of the drum and the scraping blade.

[0014]

SUMMARY OF THE INVENTION The first invention of a ceramic sieving apparatus for ceramics comprises a drum provided with a number of slits in a circumferential direction, the inlet side of the ceramics raw material being high and the outlet side being low. It is provided in an inclined state and swingable around the axis of the drum,
On both sides of the axis of the drum, a pair of scraping blades are provided so as to face each other from the outside to the inside of the drum through the respective slits, and are rotatably provided.

[0015] The second invention of the sieving apparatus for ceramic soil is the invention according to the first invention, wherein the primary scraping blade is hooked to a slit group provided from the entrance side to the exit side of the drum of ceramic earth. The secondary scraping blades each having a portion are provided rotatably.

A third aspect of the present invention relates to an apparatus for sieving an earth for ceramics, wherein the scraping blades are provided with hook portions in the first aspect.

A fourth aspect of the present invention is a ceramic ground sieving apparatus according to the first aspect, wherein a driving motor is connected to a rotating shaft by rotatably supporting the scraping blades, and a driving motor is provided.
An inverter for controlling the rotation of the drive motor is connected to the motor,
The inverter is provided with a detecting means for detecting a current exceeding a preset current value and a current opening / closing means for temporarily interrupting the current to the drive motor based on a detection signal of the detecting means. is there.

[0018]

[Function] The original soil carried into the drum is agitated and dispersed in the drum while being swung by following the swinging motion of the drum, and the rotating action of the scraping blades exposed in the drum. The compound exercise is performed after the waiting, and the sieving work and the foreign matter selection work are efficiently performed.

In the case where a secondary scraping blade provided with a hook portion is provided in addition to the primary scraping blade, the fine original soil is dropped through the slit on the primary scraping blade side, and the secondary scraping blade is provided. On the side, of the residue that could not be treated on the side of the primary scraping blade, a considerable part of the residue is coarsely and mediumly crushed, and the crushed relatively coarse original soil falls through a slit.

Untreated raw soil that could not be dropped by the secondary scraping blade side through the slit is discharged out of the drum as foreign matter (residue). Furthermore, among the foreign substances contained in the original soil carried into the drum, foreign substances which are not sieved by the rotation of the scraper blades and the operation of the swinging of the drum, and which do not fall from the slit, are placed on the slit in the drum. If the scraper blades are bitten at or near it, the scraper blades, whose rotation is controlled by the inverter, still try to rotate while still catching foreign matter, although the drum swings.

However, since the scraping blades are bitten by foreign matter, the rotation is prevented and an overload is applied to the driving motor and the like. When the load increases, the inverter increases the current value in accordance with the load and flows to the drive motor. However, when a current exceeding the load preset in the inverter flows, the current value is provided in the inverter. The detected current value is detected by the detected detecting means. Therefore, the current switching means provided in the inverter is temporarily operated by the detection means, and the supply of the current to the drive motor is temporarily interrupted. Thus, following the stop of the drive motor, the rotational force to the scraping blade is temporarily stopped. Although the rotational force to the scraping blade is temporarily stopped, the repulsive force of the rotating shaft provided with the scraping blade causes the drum to slightly reversely rotate in the opposite direction from the inside to the outside of the drum.

Thus, the scraping blades and the foreign matter caught inside the drum are released, and are sent toward the outlet of the drum according to the swinging motion of the drum, and the transmission of the rotational force is temporarily stopped. The rotational force is transmitted again to the two blades, and the sieving operation is resumed by the two blades rotating in the normal state. And when a secondary scraping blade with a hook is provided on the exit side of the drum,
A considerable amount of the foreign matter is coarsely or medium crushed by the hook portion of the secondary scraping blade, so that the foreign matter is dropped through the slit, and the remaining foreign matter is separately discharged outside the drum.

[0023]

1 is a schematic side view of the entire apparatus showing an embodiment of the present invention, FIG. 2 is a front view of FIG. 1, FIG. 3 is a plan view of the same, FIG. 4 is a diagram showing a drum and two types of scraping blades. 5 is a schematic front view showing the relationship between the primary scraping blade and the drum, FIG. 6 is a schematic front view showing the relationship between the secondary scraping blade and the drum, FIG. 7 through FIG. FIG. 10 is a front view of a main part showing the action of the drum and the primary scraping blade. FIG. 10 is a schematic diagram showing a control mechanism of the inverter, the driving motor, the rotating shaft, the primary scraping blade and the secondary scraping blade. FIG. 11 is a flowchart showing the processing steps of the ceramic soil.

The present invention basically comprises a cylindrical drum 12 having a slit 10 provided in a circumferential direction, a primary scraping blade 14 and a secondary scraping blade 16 having a hooking portion 15. .

The drum 12 is cylindrical and has a number of slits 10 in the circumferential direction. Therefore, in the present invention, a so-called original ground sieve surface is constituted by a large number of groups of slits 10. The interval between the slits 10 is determined according to the desired size of the object to be sieved. In the embodiment of the present invention, the interval is set to about 30 to 50 mm. Therefore, the original soil having a size of about 30 to 50 mm or less is configured to fall from the slit 10 constituting the sieve surface, and the original soil of about 30 to 50 mm or more is primarily scraped off in the drum 12 as a residue, that is, a foreign substance. It is configured to be sent from the blade 14 side to the secondary scraping blade 16 or to be discharged from the secondary scraping blade 16 side to the outside of the drum 12.

Therefore, in this specification, the term “foreign matter” refers to the slit 1 on the primary scraping blade 14 side.
There are two notions of a residue which does not fall from the slit 10 and a residue which does not fall from the slit 10 among the residue sent from the primary scraping blade 14 side to the secondary scraping blade 16 side. In other words, the “foreign matter” on the side of the primary scraping blade 14 is
Most of the side adopts a configuration of coarse or medium crushing, so that it does not necessarily become a “foreign matter” in the conventional concept.

Therefore, for convenience of explanation, the residue on the side of the primary scraping blade 14 is referred to as "primary foreign material" unless otherwise noted. The residue discharged from the primary scraping blade 14 side to the outside of the drum 12 is referred to as “secondary foreign matter”. Therefore, in the present invention, the secondary foreign matter corresponds to the foreign matter in the original idea, and the primary foreign matter is a term for convenience of explanation, and it can be said that the primary foreign matter still includes the original earth which can be used as a raw material for ceramic industry.

According to the present invention, the apparatus is configured so as to be able to cope with the type of the original clay for ceramic industry. The details will be described later, but in the case of the original soil where the foreign matter is relatively small, the original scraping is mainly performed by the primary scraping blade 14, and the residue sieved as the primary foreign matter is further crushed or The medium is crushed so as to be carried out to a subsequent process, and only the remaining secondary foreign matter (residue) is discarded as a foreign matter according to the conventional concept.

The primary foreign matter is scraped off from the blade 14 side and sent to the secondary scraping blade 16 side, and the secondary foreign matter is transferred to the drum 1.
In order to be able to discharge to the outside, the drum 12 is provided with a slope at the entrance 34 side of the original soil and at a low slope at the exit 36 side, and the inclination angle is in a range of about 5 to 15 degrees. Is set.

The drum 12 has a support shaft 18 provided at the center.
The outlet 36 side of the foreign matter is supported by a bearing 21 fixed to the base 20. On the other hand, the inlet 34 side of the raw soil is supported by the bearing 22 provided below in a free state. The bearing 22 is fixed to the support plate 26 via the connecting member 24 on the entrance 34 side of the original soil. Since the hopper 28 is provided at the inlet 34 side of the raw soil to supply the raw soil to the drum 12, there is no room for providing sufficient space on the inlet 34 side of the support shaft 18. With such a configuration, the entrance 34 of the spindle 18
The sides are supported by bearings 22.

The drum 12 is provided to be swingable so that the original soil carried into the drum 12 is transferred to the outlet 36 side while being stirred and dispersed in the drum 12. As a specific example of the swinging means of the drum 12, a motor 30 is provided on the side of the entrance 34 of the original soil. A lever 40 is attached to the rotating shaft of the motor 30,
One end of a connecting rod 32 is pivotally attached to the tip of 40, and the other end of the coupling rod 32 is pivotally attached to a support shaft 38 mounted above the drum 12.

Therefore, when the motor 30 is driven, the drum 1 is moved through the lever 40, the connecting rod 32 and the support shaft 38.
2 is swung about the support shaft 18. In this case, the swing angle is set in the range of 60 to 90 degrees. The original soil supplied from the hopper 28 on the inlet 34 side is rocked in the drum 12 to be surely dispersed and stirred. Accordingly, among the original soil sieved after the rotation of the primary scraping blades 14 and the secondary scraping blades 16 in the drum 12 to be described later, the smaller ones are provided below the drum 12 by the interval of the slits 10. The residue which is forcibly dropped on the conveyor 48 and does not fall from the slit 10 is sent to the outlet 36 side.

However, when the raw soil is sieved, the rocking of the drum 12 is not enough to drop even the fine ground due to the interval between the slits 10. Therefore, the present invention is further devised. It is. A pair of rotating shafts 50, 50 are located closer to the bottom of the drum 12, on both sides of the axis of the drum 12 and closer to the bottom of the drum 12.
Is provided. And the outlet 3 of these rotating shafts 50
Driving motors 52 are provided at the ends on the 6 side, respectively.
The rotational force of the drive motor 52 is transmitted to the rotating shaft 50 (see FIGS. 1, 3, and 10).

The rotating shafts 50, 50 have 2
The primary scraping blades 14 and the secondary scraping blades 16 having the hook portions 15 are mounted, and the rotating shafts 50 and 5 are mounted.
Needless to say, it is configured to rotate according to zero rotation. Therefore, the primary scraping blades 14
The secondary scraping blades 16 are provided to face each slit 10. Of the two types of scraping blades 14 and 16 mounted on the rotating shafts 50 and 50, the primary scraping blade 14 near the inlet 34 is, as shown in FIG.
This is a mode in which four projections 17 are provided at equal intervals so that the original soil can be sieved by these four projections 17 when rotating. However, the invention is not limited to such a form.

On the other hand, the secondary scraping blade 16 mounted near the outlet 36 has, as shown in FIG. 6, a hook portion 15 having a sharp edge on both sides. As described above, the secondary scraping blade 16 does not discharge the residue sent as primary foreign matter from the primary scraping blade 14 side to the outside of the drum 12 as it is. Due to the combined movement of the dropping blade 16 due to the rotational movement, the hook 15 scratches the primary foreign matter,
Alternatively, it has a function of crushing or medium crushing by biting.

These two types of primary scraping blades 14
As shown in FIGS. 5 and 6, the secondary scraping blade 16 is inserted from the outside of the drum 12 to the inside of the drum 12 through the slit 10, and is rotated toward the inside of the drum 12. It is provided freely. Therefore, the primary scraping blade 14 and the secondary scraping blade 16 are rotated in a state where a part of the primary scraping blade 14 and the secondary scraping blade 16 are exposed to the inside of the drum 12, so that the protrusion 17 and the hook 15 are protruded and retracted into the drum 12. In the case of the blade 14, the primary soil is scraped off, and the blades 14 are sieved. In the case of the secondary scraping blades 16, the primary foreign matter is further coarsely crushed and crushed, and then sieved together. Has the function of discharging.

The primary scraping blades 14 do not have the function of coarsely crushing the original soil, but rather oscillate the primary soil in the drum 12 by the swinging motion of the drum 12 and the primary scraping blades 14.
By the combined movement with the rotation of
Fines are forcibly dropped into the receiving table 48 through the slits 10 at intervals of 0, and larger primary foreign substances (residues) are advanced in the drum 12 at the intervals of the slits 10.
The secondary scraping blade 16 is supplied to the blade 16 side.
Therefore, the slit 10 on the side of the primary scraping blade 14
The original soil that is dropped from the ground is originally small and fine as compared with the interval between the slits 10, so it can be said that it is equivalent to a so-called coarsely crushed state that does not require crushing in the next step. Since the grinding process is omitted and the grinding process is performed immediately, there is an advantage that the material can be directly fed to the secondary roll crusher (see FIG. 11).

When the original soil contains a large amount of highly viscous moisture, the original earth is stirred and dispersed in the drum 12 by the swinging motion of the drum 12, so that the primary scraping blades 14 and The clogging of the slit 10 can be more reliably prevented in conjunction with the rotational movement of the secondary scraping blade 16.

Therefore, the rotating primary scraping blade 14 has a function of forcibly stirring and dispersing the original soil in the drum 12 by a combined movement following the swinging movement of the drum 12, Care is taken so that the sieving can be performed more reliably without the original soil clogging the slit 10.

On the other hand, since the secondary scraping blade 16 is provided with the hook portion 15 as described above, the secondary scraping blade 16 has a function of crushing the original soil after the swing of the drum 12. Therefore, the rotational motion of the primary scraping blade 14 and the swinging motion of the drum 12 cause the slit 1
It has a function of coarsely or mediumly crushing a considerable amount of secondary foreign matter (remaining original soil) that has not fallen through zero. In addition, a slit 1 is formed on the primary scraping blade 14 side.
The remaining portion of the original soil, that is, a considerable part of the primary foreign matter, which could not be dropped through the slit 10, is crushed on the secondary scraping blade 16 side in tandem with the swinging motion of the drum 12, and is forced through the slit 10. Needless to say, they are dropped. Of course, those that cannot be crushed by the secondary scraping blades 16 are discharged as secondary foreign substances from the outlet 36 of the drum 12.

In the above-described embodiment of the present invention, the sieving apparatus has been described on the premise that there is a relatively large amount of foreign matter in the original soil. Are planning.

As described above, the configuration of the primary scraping blades 14 is intended solely for sieving the original soil, and does not have a function of crushing foreign substances. Therefore, in the case where the amount of foreign matter is relatively small, by providing the primary scraping blades 14 over the entire length of the drum 12, it is possible to reliably screen and discharge the foreign matter. However, by using the secondary scraping blades 16 having the hook portions 15 instead of the primary scraping blades 14 in case the foreign matter in the original soil is more mixed, crushing and crushing of the original soil are performed. The inventor also plans to do so.
Of course, the inventor also plans to provide secondary scraping blades 16 over the entire length of the drum 12. Note that the terms “primary scraping blade” and “secondary scraping blade” used in this specification are not limited to the drum 12
This is for the sake of convenience for distinguishing the case where two types of scraping blades having different forms are employed. Therefore, the term “scraping blade” simply corresponds to the primary scraping blade 14 as a specific example, and means that it does not have a hook portion.

It cannot be avoided that hard foreign matter larger than the interval between the slits 10 is mixed into the original soil, but it goes without saying that if such foreign matter is mixed in, it does not fall from the slit 10.

The primary scraping blades 14 and the secondary scraping blades 16 bite foreign matter during rotation, and the rotation is prevented, and the sieving operation may be interrupted. Since the possibility of damage to the dropping blades 14, 16 and the rotating shaft 50, the driving motor 52, etc. is not small, the following countermeasures are taken in the present invention.

Although the drive motor 52 is connected to the rotating shaft 50 as described above, an inverter 54 is provided between the drive motor 52 and a power supply 53 (three-phase AC power supply). Have been. A general-purpose inverter is widely known as a control means for operating a three-phase induction motor at a variable speed. Similarly, the inverter 54 of this embodiment also uses an AC power supply once. The drive motor 52 is converted into a direct current and then converted into an alternating current to control the drive motor 52. When the required output frequency is converted from the direct current to the alternating current, the drive motor 52 is applied. This realizes smooth variable speed operation.

The inverter 54 of this embodiment has a function of flowing an electric current corresponding to the load to the drive motor 52 to the drive motor 52 to perform operation control corresponding to the load. Further, the inverter 54 is provided with a detecting means 56 for detecting a current value when the load over the drive motor 52 exceeds a set value, that is, when an overload occurs, and for interrupting the current to the drive motor 52 at the time of overload. A current switching means 58 that can be temporarily operated and continuously energized is connected (FIG. 10).
See). Therefore, the current switching means 58 has a function of switching an electric circuit.

Next, the inverter 54 and the detecting means 56
The operation of preventing overload by the current switching means 58 will be described. When the primary scraping blade 14 and the secondary scraping blade 16 bite a foreign substance in the original soil, the primary scraping blade 14 and the secondary scraping blade 16 still try to rotate. The load on the drive motor 52 increases.

When the load on the driving motor 52 increases, the current value increases in accordance with the load and flows to the driving motor 52 by the action of the inverter 54. However, the inverter 54
When an overload state exceeding the load exceeds the preset current value, the current value at that time is detected by the detecting means 56, and the current switching means 58 is actuated by the detection signal to drive the driving motor 52. The current is interrupted temporarily.

When the current to the drive motor 52 is temporarily interrupted, for example, for about 2 seconds, the rotating shaft 50 loses its rotational force. However, even though it is a short period of time, the drive motor is not driven until the rotary shaft 50 loses its rotational force.
The tab 52 exerts a force to rotate the primary scraping blade 14 and the secondary scraping blade 16 via the rotating shaft 50. Therefore, the force of the primary scraping blade 14 and the secondary scraping blade 16 acts on the foreign matter, but the rotating shaft 50 cannot rotate because the foreign matter is bitten, so that the rotating shaft 50 reduces the torsional stress. It is slightly twisted. Since the rotating shaft 50 is made of an elastic body made of a metal, elastic energy is accumulated in the rotating shaft 50 although the twist is slight. To explain this point in more detail, the magnitude of the elastic energy is governed by the steel factor of the material of the rotating shaft 50 and the like.

At the time of overload, the current is interrupted in this state, so that the force exerted on the foreign matter by the scraping blades 14 and 16 to be rotated is lost, and the elastic energy accumulated in the rotating shaft 50 causes the rotating shaft 50 to rotate. A force is generated that attempts to restore the torsion. When the torsion of the rotating shaft 50 is restored, the rotating shaft 50 reversely rotates together with the restoration of the torsion of the rotating shaft 50. The reason that the rotating shaft 50 reversely rotates when the torsion of the rotating shaft 50 is restored is that a force of the twisted minute portion of the rotating shaft 50 to slightly reversely rotate by the force for restoring the twist acts on the rotating shaft 50. , The rotation shaft 50 rotates in the reverse direction as a whole. Further, when the rotation shaft 50 starts reverse rotation, a reverse rotation force acts in accordance with the inertia moment of the rotation shaft 50, so that the reverse rotation of the twisted minute portion of the rotation shaft 50 causes the reverse rotation of the rotation amount or more. In addition, it will be performed. Thus, the rotation of the rotating shaft 50 in the reverse direction causes the primary scraping blades 14 and the secondary scraping blades 16 to rotate in the reverse direction. After waiting, the foreign matter is sent toward the outlet 36 side. After the elapse of the current cutoff time, the current flows again to the drive motor 52 to perform a steady operation.

As described above, even if the primary scraping blade 14 and the secondary scraping blade 16 bite foreign matter, the current is cut off by the drive motor 52, and as a result, both the blades 14 and 16 rotate in reverse. Damage due to overload on the drive motor 52 and the like can be prevented and foreign matter can be released.

The current value at the time of overload is set to an arbitrary current value within a range of approximately 130% to 150% of the rating of the drive motor 52 in advance. In this embodiment, the interruption time of the current is set to about 2 seconds, but may be set arbitrarily in consideration of the swing cycle of the drum 12.

[0053]

The present invention has the following advantages since it has the above configuration. (1) The combined movement of the drum having the slit with the oscillating movement and the scraping blades rotating is forced to siege the original soil, so that the original soil is surely dispersed and stirred in the drum. Since it is transferred from the inlet side to the outlet side, it does not accumulate in the drum, especially near the slit, so that foreign matter can be discharged out of the drum as residue without causing clogging of the slit, and fine soil can be removed from the slit. It can be reliably dropped out of the drum. (2) By providing the secondary scraping blades together with the primary scraping blades, both blades rotate with the swing of the drum, so that most of the original soil can be sieved on the primary scraping blade side, and the primary scraping Since the residue scraped off from the blade side and sent to the blade side is sieved and crushed again, the amount of soil discharged as foreign matter out of the drum can be significantly reduced. Therefore, finely sieved or crushed materials can be carried into the secondary roll crusher as it is, and can be crushed. Alternatively, the coarsely crushed ground can be carried into the primary roll crusher for secondary crushing. Since it only needs to be sent to the roll crusher, the crushing treatment by the primary roll crusher can be remarkably omitted. Therefore, it is possible to contribute to shortening of the process of treating the ceramic soil. (3) A driving motor is connected to the rotating shaft by rotatably supporting the scraping blades, an inverter for controlling the rotation of the driving motor is connected to the driving motor, and preset to the inverter. Detecting means for detecting a current exceeding the detected current value and current switching means for interrupting and supplying current to the drive motor based on the detection signal of the detecting means are connected, so that foreign substances that cannot be crushed are scraped off. Even if an overload occurs on the drive motor side due to the blades biting, the current to the drive motor is interrupted, and the rotating shaft that is in a free state temporarily reversely rotates, resulting in excessive rotation. Damage to the scraper blades and the drive motor due to the load can be prevented, and sieving operation can be performed continuously without stopping the apparatus by restarting power supply.

[Brief description of the drawings]

FIG. 1 is a schematic side view of an entire apparatus showing an embodiment of the present invention.

FIG. 2 is a schematic front view of the entire apparatus showing an embodiment of the present invention.

FIG. 3 is a schematic plan view of the entire apparatus showing an embodiment of the present invention.

FIG. 4 is a schematic side view showing the relationship between a drum and two types of scraping blades.

FIG. 5 is a main part front view showing a relationship between a primary scraping blade and a drum.

FIG. 6 is a main part front view showing a relationship between a secondary scraping blade and a drum.

FIG. 7 is a main part front view showing the action of the primary scraping blade in a state where the drum is swung to one side.

FIG. 8 is a main part front view showing the action of the drum with the primary scraping blade when the drum is in a normal state.

FIG. 9 is a main part front view showing an operation with a primary scraping blade in a state where the drum is swung to the other side.

FIG. 10 is a schematic explanatory view showing a state in which a driving motor, a rotating shaft, a primary scraping blade, and a secondary scraping blade are controlled by an inverter.

FIG. 11 is a flow chart showing a process for treating a potter's clay.
It is a chart.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Slit 12 Drum 14 Primary scraping blade 15 Hook 16 Secondary scraping blade 34 Inlet of original soil 36 Outlet of original soil 50 Rotary shaft 52 Driving motor 54 Inverter 56 Detection means 58 Current switching means

Claims (4)

(57) [Claims] 1. A cylindrical drum having a plurality of slits in a circumferential direction is provided so that an inlet side of a raw clay for ceramic industry is high and an outlet side is low, and is swingable around a drum core. A ceramic blade characterized in that the blades are scraped off from the outside to the inside of the drum in a facing state on both sides of the axis of the drum through the respective slits, and are rotatably provided. Original soil sieving equipment. 2. A method in which a primary scraping blade and a secondary scraping blade having a hook portion are rotatably provided in a group of slits provided from an inlet side to an outlet side of the ceramic raw earth of the drum. The sieving apparatus of the original clay for ceramics according to claim 1, characterized in that: 3. The sieving apparatus of the original clay for ceramics according to claim 1, wherein the apparatus is a scraping blade having a hook portion. 4. A drive motor is provided on a rotating shaft on which the scraping blades are rotatably supported, and an inverter for controlling the rotation of the drive motor is connected to the drive motor. Detecting means for detecting a current exceeding a preset current value and current switching means for temporarily interrupting the current to the drive motor based on a detection signal of the detecting means. The sieving apparatus of the original clay for ceramics according to claim 1.