CN112915557A

CN112915557A - Sand piling equipment for children intelligence training

Info

Publication number: CN112915557A
Application number: CN202110163599.0A
Authority: CN
Inventors: 李智平; 卢金淼; 黄怡蝶; 王广飞; 朱琳
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-02-05
Filing date: 2021-02-05
Publication date: 2021-06-08

Abstract

The invention relates to sand piling equipment for children intelligence training, which comprises a sand piling cylinder, a placing column, a conveying mechanism and a wet water stirring mechanism, wherein the sand piling cylinder is of a horn cylinder structure with the diameter gradually reduced downwards, the placing column is arranged on the lower end surface of the sand piling cylinder, the conveying mechanism is arranged on the sand piling cylinder, and the wet water stirring mechanism is arranged in the sand piling cylinder.

Description

Sand piling equipment for children intelligence training

Technical Field

The invention relates to the technical field of sand piling for intelligence training, in particular to sand piling equipment for children intelligence training.

Background

The children are in a period of urgent need to develop in all aspects, are not bound by various social knowledge and ideas, have rich imagination, so can better develop the imagination of the children as much as possible by inducing, thus having great effect on the development of intelligence and mind of the children, sand is used as a semi-fluid substance, has no fixed shape, is a substance which is more abstract as water, is just the characteristic of the sand, and lets the children sink in the sand and cannot pull out the sand, so the imagination of the children is developed by adopting a sand piling mode, great help is provided for the intelligence development of the children, but the following problems can occur in the sand piling process for the intelligence training of the children:

1. the traditional sand piling for intelligence training is to directly pour sand on the open ground, then a child directly puts the sand into a mould to pile and mold, and the sand is not adhered, so that the sand becomes a pile of loose sand after being molded and taken out;

2. when carrying out husky training of sand heap to children, it is all entering simultaneously when sand gets into the mould, and a mould can not use whole sand to when leading to reuse, need put into sand again, lead to piling husky comparatively loaded down with trivial details.

Disclosure of Invention

Technical scheme (I)

In order to achieve the purpose, the invention adopts the following technical scheme that the sand piling device for children intelligence training comprises a sand piling cylinder, a placing column, a conveying mechanism and a wet water stirring mechanism, wherein the sand piling cylinder is of a horn cylinder structure with the diameter gradually reduced downwards, the placing column is installed on the lower end face of the sand piling cylinder, the conveying mechanism is arranged on the sand piling cylinder, and the wet water stirring mechanism is arranged in the sand piling cylinder;

the wet water stirring mechanism comprises an end cover, a water inlet, water leakage holes, uniform distribution grooves, an L-shaped frame, a support ring, a water tank, circular grooves, a rotating shaft and stirring rods, wherein the end cover is installed on the upper end face of the sand piling cylinder, the water inlet is formed in the middle of the upper end face of the end cover, the water leakage holes are formed in the lower end face of the end cover and are annularly distributed, the uniform distribution grooves are formed in the water leakage holes, the uniform distribution grooves are communicated with the water leakage holes and the water inlet holes, the L-shaped frames are symmetrically installed on the left and right of the upper end face of the end cover, the support ring is installed between the L-shaped frames, the water tank is arranged on the water inlet, penetrates through the support ring, the circular grooves with the same inner diameter as the lower end face of the sand piling cylinder are formed in the upper end face of the placing column, the rotating shaft, send husky to piling a husky section of thick bamboo through transport mechanism, after sand falls to piling a husky section of thick bamboo, water in the water tank drips on sand from the inlet opening through the hole that leaks, make dry sand and soil mix and glue together, evenly arrange the groove and make even the following hole that leaks of water discharge, when sand and soil gets into, the axis of rotation rotates and drives the puddler and rotate in step, the puddler stirs water and sand and soil, make water and more abundant the mixing of sand and soil, thereby when piling husky shaping with sand and soil through the mould, the shaping effect of the sand and soil of being convenient for.

As a preferred technical scheme of the invention, the conveying mechanism comprises a sand inlet hole, a guide plate, a connecting block, round-head baffles, a rotating shaft, a conveying belt, a striker plate, a triangular support frame and an electric motor, the sand inlet hole is formed in the upper end face of the end cover, the guide plate is mounted on the sand inlet hole, the three end faces of the guide plate are arranged in a downward-inclined manner, the guide plate is of a V-21274, the connecting block is mounted on the opposite face of the guide plate, the round-head baffles are mounted on the opposite face of the connecting block, the rotating shaft is symmetrically mounted between the round-head baffles up and down, the conveying belt is sleeved on the rotating shaft, the striker plate is mounted on the conveying belt and is arranged at equal intervals along the conveying belt, the triangular support frame is mounted on the outer wall of the sand piling cylinder, the round-head baffles are mounted on the inclined planes of the triangular support frame, the first electric motor is mounted, drive the pivot through an electric motor and rotate, the pivot is rotated and is driven the conveyer belt and rotate, the conveyer belt rotates and conveys sand, sand striker plate carries out the interval separation to sand when conveying, avoid sand in the data send process to descend the landing downwards simultaneously, make sand unable conveying, when the button head baffle supports the pivot, avoid sand to descend the landing from the side, the sand of conveyer belt conveying is stirred in falling to piling husky section of thick bamboo from advancing husky hole, sand conveying while stirring makes sand and more abundant mixing of water, make the fashioned effect of piling husky improve.

As a preferred technical scheme of the invention, the circular groove is provided with a blanking hole, the blanking hole is of a conical structure with the diameter gradually smaller downwards, the lower end surface of the blanking hole is provided with an intermittent feeding groove, a driving shaft is arranged in the intermittent feeding groove, the driving shaft is sleeved with a driving disc, the driving disc is provided with distributing grooves, the distributing grooves are distributed at equal intervals along the circumferential direction of the driving disc, the intermittent feeding groove is provided with placing grooves, the rotating shaft and the driving shaft are both sleeved with meshed driving gears in a penetrating manner through the intermittent feeding groove, a second electric motor is arranged in the placing groove, an output shaft of the second electric motor is provided with a gear shaft, a rotating gear is sleeved on the gear shaft and meshed with the driving gears, the second electric motor drives the gear shaft to rotate, the gear shaft drives the rotating gears to be meshed with the driving gears for transmission, so that the driving gears drive the rotating shaft to rotate, the axis of rotation rotates and drives the puddler and mix the stirring to sand and soil and water, it drives gear engagement drive axis simultaneously and rotates, drive the axle and drive the driving disk and rotate, when dividing the silo on the driving disk and unloading hole time spent, sand and soil after the stirring enters into from the unloading hole and divides the silo in, then rotate through the driving disk and drive the sand and soil that divides the silo in and carry out intermittent type unloading, the husky shaping of heap of the mould of being convenient for, when dividing the silo on the driving disk and unloading hole not time spent, the up end of driving disk is blocked up the unloading hole, make sand and soil carry out intermittent type conveying.

As a preferred technical scheme of the invention, the lower end surface of the intermittent feeding groove is provided with intermittent discharge holes, the intermittent discharge holes and the blanking holes are arranged in a staggered manner, the lower end surface of the intermittent discharge holes is provided with a guide cylinder, the guide cylinder is of a horn-shaped structure, and when the material distributing groove is opposite to the intermittent discharge holes, sandy soil in the material distributing groove falls into the guide cylinder from the intermittent discharge holes to be blanked, so that the sandy soil is blanked intermittently, and sand piling of the sandy soil is facilitated.

As a preferred technical scheme of the invention, the lower end surface of the placing column is provided with arc-shaped supporting plates, the arc-shaped supporting plates are arranged at equal intervals along the circumferential direction of the placing column, the lower end surface of the arc-shaped supporting plates is provided with a disc base, the disc base is provided with a rotating groove, the rotating groove is internally provided with a third electric motor, the output shaft end of the third electric motor is provided with an intermittent shaft, the intermittent shaft is sleeved with an incomplete gear, the rotating groove is rotatably connected with a rotating rod through a bearing, the rotating rod is sleeved with an intermittent gear which is intermittently meshed with the incomplete gear, the rotating rod is provided with a driving plate in a penetrating way with the rotating groove, the driving plate is arranged at equal intervals along the circumferential direction of the rotating rod, the driving plate is provided with a placing groove, a mold is placed in the placing groove, the third electric motor drives, the dwang rotates and drives the driving plate and rotate, when the driving plate stops intermittently, the mould of one of them driving plate upper end just in time is in the lower extreme of intermittent type relief hole, in sand falls the guide cylinder from the intermittent type relief hole, fall the mould from the guide cylinder on, then after a set of sand falls, drive the board and move the mould and rotate, a set of mould removes the below of guide cylinder under the drive of driving plate simultaneously, will have the mould of sand simultaneously and pressurize for sand is stereotyped in the mould, then take out the mould and pour out the structural shape of relativity again.

As a preferable technical scheme of the invention, the rotating shaft is provided with scrapers at equal intervals along the circumferential direction, the lower end surfaces of the scrapers are close to the lower end surface of the circular groove, and the scrapers bring the stirred sandy soil to the blanking hole for intermittent discharge in the rotating process.

(II) advantageous effects

1. The conveying mechanism can enable children to pour sand on the conveying belt through tools for conveying, and then the wet water stirring mechanism is used for spraying water and wetting the sand in the conveyed sand piling cylinder, so that the sand can be quickly shaped when piled into various shapes, and the sand is prevented from becoming a pile of scattered sand after the mold is taken out;

2. the driving disc rotates to drive the sandy soil in the material distributing groove to rotate, so that the sandy soil is intermittently and downwards conveyed, a mould on the driving plate below the guide cylinder is conveniently stacked and formed and then replaced to a next mould, and the situation that the sandy soil falls on the same mould completely and is repeatedly loaded is avoided;

3. the sand and soil in the stirring process, the rotating shaft drives the scraper to rotate, so that the scraper scrapes the sand and soil in the circular groove into the discharging hole, the sand and soil is conveyed, the phenomenon that the sand and soil cannot fall down when the sand and soil in the sand piling cylinder is less is avoided, and the conveying of the sand and soil is accelerated.

Drawings

The invention is further illustrated with reference to the following figures and examples.

FIG. 1 is a perspective sectional view of the present invention;

FIG. 2 is a front cross-sectional view of the present invention;

FIG. 3 is an enlarged view of a portion of FIG. 2 in accordance with the present invention;

FIG. 4 is an enlarged view of a portion of the invention at B of FIG. 2;

FIG. 5 is a top cross-sectional view of the placement post of the present invention;

FIG. 6 is a top cross-sectional view of the arcuate support plate and disk base of the present invention;

FIG. 7 is a right side view of the transfer mechanism of the present invention;

FIG. 8 is an enlarged view of a portion of the invention at C of FIG. 7;

FIG. 9 is an enlarged view of a portion of the invention at D of FIG. 7;

FIG. 10 is a schematic view of the incomplete gear and intermittent gear of the present invention.

Detailed Description

The embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways, which are defined and covered by the claims.

As shown in fig. 1 to 10, a sand piling device for children's intelligence training comprises a sand piling cylinder 1, a placing column 2, a conveying mechanism 3 and a wet water stirring mechanism 4, wherein the sand piling cylinder 1 is of a horn-shaped cylinder structure with the diameter gradually decreasing downwards, the placing column 2 is installed on the lower end surface of the sand piling cylinder 1, the conveying mechanism 3 is arranged on the sand piling cylinder 1, and the wet water stirring mechanism 4 is arranged in the sand piling cylinder 1;

the wet water stirring mechanism 4 comprises an end cover 40, a water inlet 41, a water leakage hole 42, an even distribution groove 43, an L-shaped frame 44, a support ring 45, a water tank 46, a circular groove 47, a rotating shaft 48 and a stirring rod 49, wherein the end cover 40 is arranged on the upper end surface of the sand piling barrel 1, the water inlet 41 is arranged in the middle of the upper end surface of the end cover 40, the water leakage hole 42 is arranged on the lower end surface of the end cover 40, the water leakage hole 42 is annularly arranged, the even distribution groove 43 is arranged on the water leakage hole 42, the even distribution groove 43 is communicated with the water leakage hole 42 and the water inlet hole, the L-shaped frames 44 are symmetrically arranged on the upper end surface of the end cover 40 from left to right, the support ring 45 is arranged between the L-shaped frames 44, the water tank 46 is arranged on the water inlet 41, the water tank 46 penetrates through the support ring 45, the circular groove 47 with the same inner diameter of the lower, install puddler 49 along circumference equidistance on the axis of rotation 48, puddler 49 is arranged along 48 axial equidistance of axis of rotation, send husky to piling a husky section of thick bamboo 1 through transport mechanism 3, after sandy soil falls to piling husky section of thick bamboo 1, water in the water tank 46 drips on sandy soil through hole 42 that leaks from the inlet opening, make dry sandy soil mix and glue together, evenly arrange the groove 43 and make even the following hole 42 that leaks of water discharge, when sandy soil gets into, axis of rotation 48 rotates and drives puddler 49 and rotate in step, puddler 49 stirs water and sandy soil, make water and more abundant mixing of sandy soil, thereby when piling husky shaping with sandy soil through the mould, the shaping effect of the sandy soil of being convenient for.

The circular groove 47 is provided with a blanking hole 370, the blanking hole 370 is a conical structure with a diameter gradually smaller downwards, the lower end surface of the blanking hole 370 is provided with an intermittent feeding groove 371, a driving shaft 372 is installed in the intermittent feeding groove 371, a driving disc 373 is sleeved on the driving shaft 372, a distributing groove 374 is arranged on the driving disc 373, the distributing grooves 374 are circumferentially arranged along the driving disc 373 at equal intervals, a placing groove 375 is arranged on the intermittent feeding groove 371, a rotating shaft 48 and the driving shaft 372 are both sleeved with a meshed driving gear 376 through the intermittent feeding groove 371, a second electric motor 377 is installed in the placing groove 375, an output shaft of the second electric motor 377 is provided with a gear shaft 378, the gear shaft 378 is sleeved with a rotating gear 379, the rotating gear 379 is meshed with the driving gear 376, the second electric motor 377 drives the gear 376 to rotate, the gear shaft drives the rotating gear 379 and the driving gear 376 to mesh and transmit, thereby make drive gear 376 drive axis of rotation 48 and rotate, axis of rotation 48 rotates and drives puddler 49 and mix the stirring to sand and soil and water, it meshes the drive shaft 372 and rotates to drive gear 376 meshing conveyer belt 36 simultaneously, drive shaft 372 drives driving disk 373 and rotates, when dividing silo 374 on driving disk 373 is relative with unloading hole 370, sand and soil after the stirring enters into dividing silo 374 from unloading hole 370, then rotate the sand and soil that drives in dividing silo 374 through driving disk 373 and carry out intermittent type unloading, the pile sand shaping of the mould of being convenient for, when dividing silo 374 on driving disk 373 is not relative with unloading hole 370, the up end of driving disk 373 blocks up unloading hole 370, make sand and soil carry out intermittent type and convey, be convenient for sand and soil shaping in the mould.

The rotating shaft 48 is provided with scrapers 480 at equal intervals along the circumferential direction, the lower end surfaces of the scrapers 480 are close to the lower end surface of the circular groove 47, and the scrapers 480 carry the stirred sandy soil to the blanking hole 370 for intermittent discharge in the rotating process.

The conveying mechanism 3 comprises a sand inlet hole 30, a guide plate 31, connecting blocks 33, round-head baffles 34, a rotating shaft 35, a conveying belt 36, a material baffle 37, a triangular support frame 38 and an electric motor 39, the upper end face of an end cover 40 is provided with the sand inlet hole 30, the guide plate 31 is installed on the sand inlet hole 30, the guide plate 31 is of a V-21274structure with three end faces inclined downwards, the connecting blocks 33 are installed on opposite faces of the guide plate 31, the round-head baffles 34 are installed on opposite faces of the connecting blocks 33, the rotating shafts 35 are symmetrically installed between the round-head baffles 34 up and down, the conveying belt 36 is sleeved on the rotating shaft 35, the material baffle 37 is installed on the conveying belt 36, the material baffle 37 is arranged at equal intervals along the conveying belt 36, the triangular support frame 38 is installed on the outer wall of the sand piling barrel 1, the triangular support frame 38 is installed on the front round-head baffles 34 and the rear-round-head baffles, an electric motor 39's output shaft is connected with one of them pivot 35, it rotates to drive pivot 35 through an electric motor 39, pivot 35 rotates and drives conveyer belt 36 and rotates, conveyer belt 36 rotates and conveys husky soil, the striker plate 37 carries out the interval separation to husky soil when husky soil conveys, avoid husky soil downward landing in the data send process simultaneously, make husky soil unable convey, when button head baffle 34 supports pivot 35, avoid husky soil to carry out the landing from the side, husky soil that conveyer belt 36 conveyed falls into pile sand section of thick bamboo 1 from entering husky hole 30 and stirs, husky soil conveys the limit stirring and makes husky soil and water more abundant mix, make the fashioned effect of pile sand obtain improving.

Intermittent type discharge hole 37a is seted up to the lower terminal surface of intermittent type feed chute 371, intermittent type discharge hole 37a and unloading hole 370 are crisscross arranges, and guide cylinder 37b is installed to the lower terminal surface of intermittent type discharge hole 37a, guide cylinder 37b is tubaeform structure, when dividing silo 374 to be relative with intermittent type discharge hole 37a, the interior sand and soil of dividing silo 374 carries out the unloading in the guide cylinder 37b from intermittent type discharge hole 37a interior whereabouts for sand and soil is the unloading of intermittent type nature, the heap sand of the sand and soil of being convenient for.

The lower end surface of the placing column 2 is provided with an arc-shaped supporting plate 20, the arc-shaped supporting plate 20 is arranged along the placing column 2 at equal intervals in the circumferential direction, the lower end surface of the arc-shaped supporting plate 20 is provided with a disc base 21, the disc base 21 is provided with a rotating groove 22, the rotating groove 22 is internally provided with a third electric motor 23, the output shaft end of the third electric motor 23 is provided with an intermittent shaft 24, the intermittent shaft 24 is sleeved with an incomplete gear 25, the rotating groove 22 is rotatably connected with a rotating rod 26 through a bearing, the rotating rod 26 is sleeved with an intermittent gear 27 which is intermittently meshed with the incomplete gear 25, the rotating rod 26 is provided with a driving plate 28 by penetrating the rotating groove 22, the driving plate 28 is arranged along the rotating rod 26 at equal intervals in the circumferential direction, the placing groove 28 is provided with a placing groove, a mold is arranged in the placing groove, the third electric motor 23 drives the incomplete gear 25 to, the rotating rod 26 rotates to drive the driving plate 28 to rotate, when the driving plate 28 stops intermittently, the mold at the upper end of one driving plate 28 is just positioned at the lower end of the intermittent discharge hole 37a, sandy soil falls into the guide cylinder 37b from the intermittent discharge hole 37a and falls onto the mold from the guide cylinder 37b, then after a group of sandy soil falls off, the driving plate 28 drives the mold to rotate, meanwhile, the next group of molds moves to the lower part of the guide cylinder 37b under the driving of the driving plate 28, and meanwhile, the mold with the sandy soil is pressurized, so that the sandy soil is shaped in the mold, and then the mold is taken out to pour out a relative structural shape.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. The utility model provides a children's intelligence training is with piling husky equipment, includes pile husky section of thick bamboo (1), places post (2), transport mechanism (3) and wet water rabbling mechanism (4), its characterized in that: the sand piling cylinder (1) is of a horn-shaped cylinder structure with the diameter gradually decreasing downwards, a placing column (2) is installed on the lower end face of the sand piling cylinder (1), a conveying mechanism (3) is arranged on the sand piling cylinder (1), and a wet water stirring mechanism (4) is arranged in the sand piling cylinder (1);

the wet water stirring mechanism (4) comprises an end cover (40), a water inlet (41), water leakage holes (42), an even distribution groove (43), an L-shaped frame (44), a support ring (45), a water tank (46), a circular groove (47), a rotating shaft (48) and a stirring rod (49), wherein the end cover (40) is installed on the upper end face of the sand piling barrel (1), the water inlet (41) is formed in the middle of the upper end face of the end cover (40), the water leakage holes (42) are formed in the lower end face of the end cover (40), the water leakage holes (42) are annularly arranged, the even distribution groove (43) is formed in the water leakage holes (42), the even distribution groove (43) is communicated with the water leakage holes (42) and the water inlet holes, the L-shaped frames (44) are symmetrically installed on the left and right of the upper end face of the end cover (40), the support ring (45) is installed between the L-shaped frames, the water tank (46) penetrates through the support ring (45), the upper end face of the placing column (2) is provided with a circular groove (47) with the same inner diameter of the lower end face of the sand piling cylinder (1), a rotating shaft (48) is rotatably connected between the circular groove (47) and the end cover (40) through a bearing, stirring rods (49) are installed on the rotating shaft (48) along the circumferential direction at equal intervals, and the stirring rods (49) are arranged along the axial direction at equal intervals of the rotating shaft (48).

2. A piling sand device for children's intellectual training, according to claim 1, characterized in that: the conveying mechanism (3) comprises sand inlet holes (30), guide plates (31), connecting blocks (33), round-head baffles (34), rotating shafts (35), a conveying belt (36), a material baffle plate (37), a triangular support frame (38) and an electric motor (39), wherein the upper end face of an end cover (40) is provided with the sand inlet holes (30), the guide plates (31) are installed on the sand inlet holes (30), the guide plates (31) are of a 21274with three end faces inclined downwards, the structure is of a shape, the connecting blocks (33) are installed on opposite faces of the guide plates (31), the round-head baffles (34) are installed on opposite faces of the connecting blocks (33), the rotating shafts (35) are symmetrically installed between the round-head baffles (34) from top to bottom, the conveying belt (36) is sleeved on the rotating shafts (35), the material baffle plate (37) is installed on the conveying belt (36), and the material baffle plate (37) is arranged equidistantly along, a triangular support frame (38) is installed on the outer wall of the sand piling cylinder (1), a front round-head baffle plate and a rear round-head baffle plate (34) are installed on an inclined plane of the triangular support frame (38), a first electric motor (39) is installed on the round-head baffle plates (34) through a rack, and an output shaft of the first electric motor (39) is connected with one of the rotating shafts (35).

3. A piling sand device for children's intellectual training, according to claim 1, characterized in that: the circular groove (47) is provided with a blanking hole (370), the blanking hole (370) is of a conical structure with the diameter gradually smaller downwards, the lower end face of the blanking hole (370) is provided with an intermittent feeding groove (371), a driving shaft (372) is installed in the intermittent feeding groove (371), the driving shaft (372) is sleeved with a driving disc (373), the driving disc (373) is provided with a distributing groove (374), the distributing groove (374) is circumferentially and equidistantly distributed along the driving disc (373), the intermittent feeding groove (371) is provided with a placing groove (375), the rotating shaft (48) and the driving shaft (372) are respectively sleeved with a driving gear (376) meshed with the intermittent feeding groove (371), a second electric motor (377) is installed in the placing groove (375), a gear shaft (378) is installed on an output shaft of the second electric motor (377), and a rotating gear (379) is sleeved on the gear shaft (378), the rotating gear (379) is meshed with the driving gear (376).

4. A piling sand device for children's intellectual training according to claim 3, characterized in that: the lower end face of the intermittent feeding groove (371) is provided with intermittent discharge holes (37a), the intermittent discharge holes (37a) and the discharge holes (370) are arranged in a staggered mode, guide cylinders (37b) are installed on the lower end face of the intermittent discharge holes (37a), and the guide cylinders (37b) are of a horn-shaped structure.

5. A piling sand device for children's intellectual training, according to claim 1, characterized in that: the lower end face of placing post (2) install arc backup pad (20), arc backup pad (20) are arranged along placing post (2) circumference equidistance, disc base (21) are installed to the lower end face of arc backup pad (20), disc base (21) are last to have seted up rotation groove (22), install No. three electric motor (23) in rotation groove (22), intermittent type axle (24) are installed to the output axle head of No. three electric motor (23), the cover is equipped with incomplete gear (25) on intermittent type axle (24), be connected with dwang (26) through the bearing rotation in rotation groove (22), the cover is equipped with intermittent type gear (27) with incomplete gear (25) intermittent type meshing on dwang (26), dwang (26) are worn to establish rotation groove (22) and are installed drive board (28), drive board (28) are arranged along dwang (26) circumference, the last recess of having seted up of drive board (28), a mould is arranged in the placing groove.

6. A piling sand device for children's intellectual training, according to claim 1, characterized in that: the scraper plates (480) are arranged on the rotating shaft (48) at equal intervals along the circumferential direction, and the lower end faces of the scraper plates (480) are close to the lower end face of the circular groove (47).