JP2011218263A - Hulling sorter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent unpolished rice from being removed together with dust when sucking and removing the dust from the taken-out unpolished rice of an unpolished rice lifting machine in a hulling sorter.SOLUTION: In the hulling sorter equipped with a hulling part 1, a rubbed-off rice winnowing part 2 having a sucking winnower, a mixed-rice sorting part 3 of an oscillation sorting plate type, and the unpolished rice lifting machine 5 which takes out the sorted unpolished rice of the mixed-rice sorting part, a dust sucking part 36 is arranged at an unpolished rice takeout part of the unpolished rice lifting machine 5, and the dust sucking part 36 and the sucking winnower of the rubbed-off rice winnowing part 2 are connected to each other by a dust sucking winnower passage 37. Then, a dust sucking wind volume adjuster which adjusts a flow-in dust sucking wind volume is arranged at a dust sucking box of the dust sucking part 36.

Description

  The present invention relates to a dust removing device for removing dust from unpolished rice taken out of a brown rice masher in a rice hull sorter.

  In a rice bran sorting machine equipped with a rice milling unit, a sliding rice-style sorting unit having suction tang, a mixed rice sorting unit of a swing sorting plate type, and a brown rice cerealing machine for taking out the sorted brown rice of the mixed rice sorting unit In addition, it is known that a dust suction unit is provided in a brown rice extraction unit of a brown rice cerealing machine to remove dust from the brown rice (Patent Document 1).

JP 2006-95434 A

  In the background art, the dust suction part of the brown rice masher and the suction tang of the sliding rice wind selection part are communicated with each other through a dust suction air passage to remove dust from the brown rice. Therefore, the dust intake air volume of the dust suction section is affected by the selected air volume of the suction tang, and the dust suction air volume of the dust suction section increases and decreases proportionally, and the increase and decrease of the dust suction air volume cannot be adjusted, so the brown rice is discharged from the suction tang with the dust. May cause a malfunction.

  Therefore, the present invention is intended to solve such a problem.

In order to solve the above problems, the present invention has taken the following technical means.
The invention of claim 1 includes a rice hull portion (1), a slashed rice wind selection portion (2) having a suction tang (13), a mixed rice sorting portion (3) of a swing sorting plate type, and a mixed rice In the rice bran sorting machine provided with the brown rice cerealing machine (5) for taking out the sorted brown rice of the sorting unit (3), a dust suction part (36) is provided in the brown rice extraction part of the brown rice cerealing machine (5), and the dust suction part (36) and the suction fan (13) are connected by a dust suction air passage (37), and a dust suction air volume adjusting means (38) for adjusting the amount of dust suction air flowing into the dust suction box (36a) of the dust suction section (36). ) Is provided.

  The invention of claim 2 includes a rice hull portion (1), a sliding rice wind selection portion (2) having a suction tang (13), a mixed rice sorting portion (3) of a swinging sorter plate type, and a mixed rice In the rice bran sorting machine provided with the brown rice cerealing machine (5) for taking out the sorted brown rice of the sorting unit (3), a dust suction part (36) is provided in the brown rice extraction part of the brown rice cerealing machine (5), and the dust suction part (36) and the suction fan (13) are connected by a dust suction air passage (37), and a dust suction air volume adjusting means (38) for adjusting the amount of dust suction air flowing into the dust suction box (36a) of the dust suction section (36). ), And an adjustment lever (39) for adjusting the dust intake air volume of the dust intake air volume adjusting means (38) and a hot air volume adjusting means of the suction tongue (13) are coupled to each other, and the air volume of the suction tongue (13) is controlled. When the increase / decrease adjustment is performed, the dust picking part (36) adjusts the increase in the amount of the dust-absorbing air in relation to the screen. It is.

  According to a third aspect of the present invention, there is provided a circulation / discharge switching valve according to the second aspect of the invention for switching the sorted brown rice of the swing sorting plate (15) in the mixed rice sorting section (3) to the in-machine circulation side or the out-of-machine take-out side. 52), the circulation / discharge switching valve (52) and the dust-absorbing air volume adjusting means (38) are interlocked and connected, and the circulation / discharge switching valve (52) is switched to the outside take-out side to adjust the dust-absorbing air volume. When the means (38) increases the amount of dust suction air and when the circulation / discharge switching valve (52) is switched to the in-machine circulation side, the dust suction air volume adjustment means (38) is adjusted so as to reduce the amount of dust suction air. It is a special hull sorter.

  According to the invention of claim 1, the dust-absorbing air volume of the dust-absorbing part (36) can be independently and weakly adjusted with respect to the selected air volume of the suction tang (13), and the extracted brown rice of the brown rice cerealing machine (5) Dust can be removed while suppressing the scattering of water.

  According to the invention of claim 2, the dust suction air volume of the dust suction section (36) can be increased or decreased in relation to the selected air volume of the suction tang (13), and the unpolished rice extracted from the brown rice milling machine (5) is scattered. Dust can be removed satisfactorily while suppressing.

  According to the invention of claim 3, in addition to the effect of the invention of claim 2, when the circulation / discharge switching valve (52) is switched from the outboard side to the inboard side, the brown rice cereal machine (5) Even if a small amount of brown rice is taken out of the rice, it is possible to prevent the brown rice from being sucked into the suction tang (13).

The side view of a hulling sorter and a grain sorter. The rear view of a dust suction part, the rear view of an operation tool, and a top view. The side view which abbreviate | omitted one part of the hulling sorter. The perspective view of the cover part of the rocking | fluctuation sorting plate in a mixing rice sorting part. The side view of a mixing rice sorter, and the perspective view of the cover part of a rocking sorter. The perspective view of a hulling sorter. The rear view of the upper part of a hulling sorter, and the perspective view of a dust suction air path.

Embodiments of the present invention shown in the drawings will be described below.
First, the whole structure of the hull sorter which implements this invention based on FIG. 1 is demonstrated.
The rice hull sorter is arranged on the rear side of the hulled rice wind selection unit 2 and the hulled rice wind selecting unit 2 arranged on the rear side of the hulling unit 1. The mixed rice sorting unit 3 of the oscillating sorting plate type, the mixed rice cerealing machine 4 for cerealing the crushed rice of the crushed rice wind sorting unit 2 and the crushed crushed rice of the mixed rice sorting unit 3, and the mixed rice The brown rice cerealing machine 5 takes out the sorted brown rice of the sorting unit 3 outside the machine, and the milled rice cerealing machine 27 that mills and returns the sorted rice cake of the mixed rice sorting unit 3 to the rice huller unit 1.

  The hulling portion 1 is configured in a hulling roll type, and is provided below the hulling chamber 7a, a hulling chamber 7a in which a pair of hulling rolls 7 and 7 are housed, and a hulling chamber 7a. It is composed of a vibration-type sliding rice transfer shelf 8 or the like. The rice cake of the rice hopper 6 is crushed by the rice hull rolls 7 and 7 and supplied to the fallen rice transfer shelf 8, and is transferred to the rear side by the vibrating rice transfer shelf 8 to vibrate. It is supplied to the lower part of the part 2.

  The sliding rice wind selection unit 2 includes a sliding rice wind selection box 9, a sliding rice sorting air passage 10 configured to extend in the vertical direction in the sliding rice wind selection box 9, A rice cake receiving rod 11 provided below the halfway rear bent portion in the rice sorting air passage 10; a sliding rice receiving plate 12 provided on the lower side which is the starting end of the sliding rice sorting air passage 10; The suction rice trap 13 disposed on the upper side, which is the terminal portion of the sliding rice sorting air passage 10, and the dust discharge cylinder 14 are configured.

  Thus, the crushed rice supplied to the lower part of the crushed rice sorting air passage 10 is subjected to specific gravity sorting by the suction sorting wind that flows upward, and the mixed rice with heavy rice and brown rice falls to the lower crushed rice receiving bowl 12 for sorting. Is done. Further, the relatively heavy rice cake is dropped and sorted by the rice cake receiving rod 11 in the middle of the sliding rice sorting air passage 10. Further, the light rice husk is sucked into the suction trap 13 at the end of the smashed rice sorting air passage 10, and is discharged to the outside through the dust discharge cylinder 14.

Next, the oscillating sorting type mixed rice sorting unit 3 will be described.
The multistage swing sorting plate 15 is formed with irregularities for sorting on the plate surface, and one side in the horizontal direction perpendicular to the vertical direction, with one side in the vertical direction as the high supply side and the other side as the low discharge side. The swing sorting plate 15 is inclined in both the vertical and horizontal directions, with the side on the high swing side and the opposite side on the low swing side, and the swing sorting plate 15 includes the front and rear swing arms 28 and 28 and a swing device (not shown). ) Is reciprocally swung vertically and horizontally.

  A mixed rice tank 24 is disposed above the swing sorting plate 15, and the mixed rice wind-selected by the sliding rice receiving tray 12 is cerealed by the mixed rice cerealing machine 4 to the mixed rice tank 24. Supplied. The mixed rice is then supplied to the swing sorting plate 15 via the distribution supply basket 16 and the distribution case 17.

The discharge side portion of the swinging side wall of the swing sorting plate 15 has a notch outlet cut out so that the selected soot is taken out to the lower side and passes through the reduction path 31 to the lifting machine 27. To be supplied.
The mixed rice supplied to the swaying plate 15 has a grain size, specific gravity, friction coefficient, etc., so that small brown rice with heavy specific gravity is unevenly distributed on the rocking side. Large and light specific rice cakes are distributed while drifting on the underside, and mixed with rice and brown rice that are not separated in the middle. These selected grains are separated by a brown rice partition plate 18 and a straw partition plate 19 provided on the discharge side of the swing sorting plate 15 and are taken out.

  The extracted sorted brown rice is taken out of the machine through the brown rice extraction gruel 20, the brown rice flow path 21, and the brown rice cerealing machine 5. The picked and mixed mixed rice flows through the mixed rice flow path 23 and then flows down to the sliding rice catcher 12, and then cerealed by the mixed rice masher 4, mixed rice tank 24, distribution supply basket 16, distributed. It is supplied again to the swing sorting plate 15 through the case 17 and re-sorted.

  Of the sorting soot that is flow-separated to the swaying side of the oscillating sorting plate 15, the one that has flowed down along the side wall on the swaying side is taken out from the soot discharge port to the soot reduction flow path 31 and is taken out from the soot takeout soot 25. To flow down. Also, the material that has flowed down from the side wall of the swaying side is partitioned by the heel partitioning plate 19 from the discharge side end portion of the swaying sorting plate 15 and taken out to the sardine extraction basin 25. The sorted rice cake taken out in this way is reduced to the rice huller 1 through the rice huller 27, and is re-cooked.

In addition, the rice cake sorted into the rice cake receiving bowl 11 by the sliding rice wind selection section 2 is sent to the rice milling machine 27 and reduced to the rice milling section 1 together with the sorting rice cake of the mixed rice sorting section 3.
Next, a configuration for removing dust from the selected brown rice of the brown rice cerealing machine 5 will be described with reference to FIGS. 1 and 2.

  The brown rice cerealing machine 5 is configured, for example, as an elevator type, and an elevating belt with a bucket rotates up and down in the elevating case 5a to cereal the grain, and is placed in the grain outlet portion above the elevating case 5a. A dust suction part 36 is provided to remove dust from the extracted brown rice.

  The dust suction part 36 is configured as follows. Inside the dust collection box 36a, there is formed a flow-down passage 36b in which the brown rice falls in a zigzag shape while changing its direction back and forth. An opening 36c is formed in the lower part of the dust box 36a, and the dust-absorbing sorting wind that flows in from the opening 36c is formed from the rear side to the front side so as to intersect the brown rice flowing down the flow-down passage 36b. The dust flowing through the dust sorting air passage 36d is removed. The cleaned brown rice is taken out from the lower part of the flow down passage 36b through the brown rice flow down passage 36e.

  Further, the end side of the dust sorting air passage 36d is connected to the start end portion of the dust suction air passage 37 through the relay dust suction air passage 41, and the middle portion of the dust suction air passage 37 is led to the front side of the body through the vicinity of the upper part of the swinging sorting plate 15. The end side of the dust suction air passage 37 is connected to the suction portion of the suction trap 13.

  Further, as shown in FIG. 2, the dust suction part 36 is provided with a dust suction wind adjusting means 38. This dust-absorbing air sorting means 38 has a configuration in which a net is attached to the opening 36c on the lower rear side of the dust-collecting box 36a, and a closing adjustment plate 38a that is slidable along the outside of the opening 36c is provided.

Thus, the closing adjustment plate 38a is adjusted in the vertical direction to increase / decrease the air flowing into the opening 36c of the dust sorting air passage 36d, thereby reducing / adjusting the dust sorting air volume.
Further, a finishing dust suction adjusting lever 39 is provided at an appropriate position of the machine body, the finishing dust suction adjusting lever 39 and the closing adjusting plate 38a are connected by a pulling and pulling wire 40, and the finishing dust suction adjusting lever 39 is operated along the operation guide groove 43. It is configured to adjust.

  The conventional apparatus has a configuration in which the dust suction portion 36 and the suction trap 13 are simply communicated with each other through the dust suction air passage 37. Accordingly, the amount of the dust suction air sucked from the dust suction air passage 36d to the dust suction air passage 37 is proportionally increased or decreased under the influence of the increase or decrease of the sorting air of the suction air trap 13, and the dust suction air passage 36d The increase / decrease adjustment of the amount of sucked air cannot be adjusted, and there may be a problem that the brown rice is discharged to the suction hot spring 13 together with the dust by the sucked dust selection wind.

  However, according to the above configuration, the amount of dust suction of the dust suction section 36 can be adjusted independently and weakly with respect to the strength adjustment of the sorting wind of the suction tongue 13, and dust can be removed while suppressing the scattering of brown rice. Can do.

Further, a sorting air adjusting plate 42 is provided at the suction portion of the suction trap 13, and the sorting air adjusting plate 42 is connected to the finish dust absorbing adjusting lever 39 via a pulling wire (not shown).
Accordingly, by operating the finish dust suction adjusting lever 39, the selection air volume of the suction trap 13 and the dust suction air volume of the dust suction passage 37 can be adjusted in relation to each other. In other words, when the selection air volume of the suction trap 13 is strongly adjusted, the amount of air flowing in from the opening 36c can be adjusted to be large, and the dust suction air volume of the dust suction path 37 can be adjusted to be weak. Further, if the selection air volume of the suction tang 13 is adjusted to be weak, the amount of air flowing in from the opening 36c can be adjusted to be small, and the amount of dust absorption air in the dust suction path 37 can be adjusted strongly.

According to the above configuration, the dust can be satisfactorily removed while suppressing the scattering of the brown rice to the suction tang 13 side by the dust suction portion 36.
Further, as shown in FIG. 1, a known grain sorter 45 is disposed behind the brown rice cerealing machine 5. The unpolished rice from the unpolished rice cerealing machine 5 is received by the unpolished rice hopper 46 of the grain sorting machine 45 and subjected to grain sorting. The unpolished unpolished rice is taken out from the upper unpolished grain rice extraction section 47, and the sorted straw and grain waste are removed from the lower straw. Take out from the takeout part 48. The start end side of the soot dust suction hose 49 is connected to the flow outlet of the soot extraction portion 48, and the end side of the soot dust suction hose 49 is connected to the start end side of the dust suction air passage 37.

  Further, a dust suction switching valve 50 is provided at the connection portion of the relay dust suction air passage 41 on the start end side of the dust suction air passage 37 and the connection portion of the soot dust suction hose 49 on the start end side of the dust suction air passage 37. By operating the dust suction switching lever 51, the dust suction switching valve 50 is configured to selectively open and close the two connecting portions.

  Further, as shown in FIG. 1, a circulation / discharge switching valve 52 is provided in the selected grain extraction unit of the mixed rice selection unit 3. When the circulation / discharge switching valve 52 is switched to the in-machine circulation side by operating the circulation / discharge switching lever 53, the sorted brown rice on the swing sorting plate 15 is circulated in the machine, and when switched to the outside take-out side, the swing sorting is performed. The selected brown rice on the plate 15 is taken out of the machine.

  The dust suction switching lever 51 and the circulation / discharge switching lever 52 are interlocked and connected by an interlocking rod 54. Accordingly, when the circulation / discharge switching lever 53 is switched to the outside take-out side by the circulation / discharge switching lever 53, the dust suction switching valve 50 closes the soot dust suction hose 49 side and opens the relay dust suction air passage 41 side.

  When the circulation / discharge switching valve 52 is switched to the in-machine circulation side by the circulation / discharge switching lever 53, the dust suction switching valve 50 can open the soot dust suction hose 49 side and close the relay dust suction air passage 41 side.

  According to the above configuration, the operation is simplified, dust is removed from the brown rice when the brown rice is removed from the brown rice cerealing machine 5, and rice cake is removed from the grain sorting machine 45 when the sorted brown rice is circulated in the machine, thereby improving the efficiency of the hulling work. The wrinkle removal performance of the grain sorter 45 can be enhanced. Further, by using the dust suction air passage 37 in common, the cost can be reduced. In addition, it is possible to prevent a small amount of brown rice that has been grained from the brown rice masher 5 at the time of circulation switching from being sucked by the dust suction portion 36.

  Further, if the pipe diameter of the soot dust suction hose 49 is configured to be smaller than the pipe diameter of the relay dust suction air passage 41 and the wind speed of the soot dust suction hopper 49 is increased, the soot removal performance of the soot removal of the grain sorter 45 is improved. be able to.

Further, in relation to the supply amount increase / decrease adjustment of the hail supply adjusting valve 56 of the hulling portion 1, the dust suction air adjusting means 38 may be adjusted weakly.
Next, FIG. 3 will be described.

  The mixed rice tank 24 of the mixed rice sorting unit 3 is configured to move up and down by increasing / decreasing the amount of mixed rice pool, and the rice bran supply control valve 56 of the rice huller unit 1 and the mixed rice tank 24 are interlocked via an interlocking device 57. The paddy feed control valve 56 is configured to increase / decrease in relation to the increase / decrease of the mixed rice amount in the mixed rice tank 24.

Further, an air path adjusting valve 58 is provided in the middle of the dust suction air path 37, and the air path adjusting valve 58 and the interlocking device 57 are connected via an air path adjusting rod 59. Reference numeral 66 denotes a dust suction blower.
According to the above configuration, when the amount of hulling of the hulling portion 1 is adjusted to increase or decrease in relation to the increase or decrease of the amount of mixed rice stored in the mixed rice tank 24, the air path control valve 58 can be adjusted weakly. . Therefore, dust can be removed while suppressing the scattering of brown rice from the finished brown rice.

  That is, as the opening degree of the hull supply control valve 56 increases, the amount of finished brown rice increases as the amount of hulling of the hulling portion 1 increases, so the opening degree of the air passage control valve 58 also increases and dust from the finished brown rice increases. Improve the dust absorption capacity.

Next, FIGS. 4 and 5 will be described.
The upper part of the swinging sorting plate 15 of the mixed rice sorting unit 3 is covered with a swinging upper cover 61, and the middle part of the dust suction air passage 37 is on the side of the rear end of the swinging upper cover 61 and the swinging sorting plate. Communicating with the suction part of the suction pot 13 through the upper part 15. Further, an extremely thin slit 62,... Is formed in a portion of the dust suction air passage 37 located above the swing sorting plate 15 so that the air on the swing sorting plate 15 can be sucked.

  In addition, the front center portion of the swing upper cover 61 is configured as an open / close cover 61a. In addition, a sorting light 63 is attached to the lower surface of the rear side of the opening / closing cover 61a. The back side portion of the opening / closing cover 61a is pivotally supported around the shaft 61b so as to be freely opened and closed. A recess 61c is formed at the center of the back side of the opening / closing cover 61a, and the bottom side bottom portion of the recess 61c is opened.

  According to the above configuration, the dust on the swing sorting plate 15 can be sucked from the slits 62,... Further, it is possible to suppress the adhesion of dust to the sorting light 63 and to brighten the swing sorting plate 15. Moreover, when the opening / closing cover 61a is opened, the selected grain on the swinging sorting plate 15 is taken out and dropped into the concave portion 61c of the closed opening / closing cover 61a, the selected grain spreads and is lit by the sorting light 63 to change the selected state. Can be confirmed. Further, when the opening / closing cover 61a is rotated upward, the grains in the recess 61c can be easily returned onto the swing sorting plate 15.

Next, FIG. 6 will be described.
The hulling portion 1 is disposed at the upper front side of the machine body, the sliding rice wind selection unit 2 is disposed below the hulling portion 1, and the swing rice sorting type mixed rice is disposed behind the sliding rice wind selection unit 2. The sorting unit 3 is arranged, the mixed rice cerealing machine (not shown) is arranged on the rear side of the sliding rice wind selection unit 2, and the brown rice cerealing machine 5 is arranged on the rear side of the mixed rice sorting unit 3 The hull sorter is configured.

  The dust suction part 36 is provided in the brown rice throwing hole of the brown rice cerealing machine 5, and the dust suction part 36 is connected to the cyclone 65 provided in the straw hopper 6 of the hulling part 1 by a dust suction air passage 37. A dust suction blower 66 is provided in the middle of the dust suction air passage 37 so as to remove dust from the finished brown rice.

  Further, the straw reduction channel 67 of the mixed rice sorting unit 3 and the second reduction channel 68 of the sliding rice wind sorting unit 2 are communicated with the lower side portion of the dust suction blower 66 in the dust suction channel 37, and these The grains and dust separated by the cyclone 65 configured to send the grains to the cyclone 65 while increasing the wind speed are reduced to the hulling portion 1, and the dust-collected wind is discharged by the exhaust fan.

  According to the above configuration, the sorting rice cake of the mixed rice sorting unit 3 and the second item of the sliding rice wind sorting unit 2 can be returned to the rice huller unit 1 via the dust suction air passage 37 for dust collection of the finished brown rice. The dust in the sorted brown rice can be removed while omitting the reducing slot and facilitating maintenance.

Next, FIG. 7 will be described.
The dust suction air passage 37 is divided into a front dust suction air passage 37a and a rear dust suction air passage 37b, and the rear dust suction air passage 37b is configured to be detachable so as to be separable from the front dust suction air passage 37a and the dust suction blower 66. . Therefore, when the rear dust suction air passage 37b is removed, the dust suction air passage 37 can be easily cleaned.

DESCRIPTION OF SYMBOLS 1 Rice hull part 2 Sliding rice wind selection part 3 Mixed rice sorting part 4 Mixed rice cerealing machine 5 Brown rice cerealing machine 6 Rice hopper 7 Rice hull roll 15 Oscillation sorting plate 13 Suction tang 36 Dust collection part 36a Dust collection box 37 Dust collection Air passage 38 Dust absorption air volume adjustment means 39 Adjustment lever (finishing dust absorption adjustment lever)
52 Circulation / discharge switching valve

Claims (3)

Sorting of rice husk section (1), sliding rice-style sorting section (2) having suction tang (13), mixed rice sorting section (3) of swing sorter plate type, and mixed rice sorting section (3) In the rice hull sorter equipped with the brown rice milling machine (5) to take out the brown rice,
A dust suction part (36) is provided in the brown rice extraction part of the brown rice cerealing machine (5), the dust suction part (36) and the suction tang (13) are connected by a dust suction air passage (37), and the dust suction part ( A dust sorter characterized in that the dust suction box (36a) of 36) is provided with dust suction air volume adjusting means (38) for adjusting the amount of dust suction air flowing in. Sorting of rice husk section (1), sliding rice-style sorting section (2) having suction tang (13), mixed rice sorting section (3) of swing sorter plate type, and mixed rice sorting section (3) In the rice hull sorter equipped with the brown rice milling machine (5) to take out the brown rice,
A dust suction part (36) is provided in the brown rice extraction part of the brown rice cerealing machine (5), the dust suction part (36) and the suction tang (13) are connected by a dust suction air passage (37), and the dust suction part ( The dust suction box (36a) of 36) is provided with a dust suction air volume adjusting means (38) for increasing or decreasing the amount of dust suction air flowing in, the adjustment lever (39) for adjusting the dust suction air volume of the dust suction air volume adjusting means (38) and the suction. It is characterized in that when the air volume of the suction tang (13) is increased / decreased, the dust volume of the dust suction part (36) is increased / decreased in association with the tang / air volume adjustment means of the tang (13). A hull sorter. In the invention of claim 2, there is provided a circulation / discharge switching valve (52) for switching the sorted brown rice of the swing sorting plate (15) in the mixed rice sorting section (3) to the in-machine circulation side or the out-of-machine take-out side. When the circulation / discharge switching valve (52) is switched to the outside take-out side by interlockingly connecting the / discharge switching valve (52) and the dust suction air volume adjusting means (38), the dust suction air volume adjusting means (38) is turned into the dust suction air volume. And when the circulation / discharge switching valve (52) is switched to the in-machine circulation side, the dust suction air volume adjusting means (38) is adjusted so as to reduce the dust suction air volume. .

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