JP2007068409A - Conveyor apparatus for conveying grain - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a conveyor apparatus for conveying grains, which has improved durability and a long life by constituting a conveyor composed of a plurality of divided conveyors and carbonitriding the whole surface of the conveyor including a screw blade. <P>SOLUTION: In the conveyor apparatus for conveying grains, which is rotatably equipped with a screw conveyor having a conveyor shaft 18A and a helical conveyor fixed to the conveyor shaft 18A, the conveyor is divided into a plurality of parts, the whole areas of the conveyor surfaces of at least one or more divided conveyors are carbonitrided. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a conveyor for transporting grains such as paddy rice and wheat, and more specifically, a screw such as a first conveyor, a second conveyor, a second reduction conveyor, and a cereal conveyor disposed in a threshing portion of a combine. The present invention relates to a technique for improving the wear resistance of steel.

Conventionally, carbonitriding is widely known as a surface treatment for hardening the surface of a steel material. The carbonitriding process is a process in which a surface of a steel material or the like is impregnated with nitrogen simultaneously with carbon, and a hardened layer is formed on the surface. Various methods such as a gas carbonitriding method and a plasma carbonitriding method are known as methods for performing these carbonitriding processes.
Carbonitrided materials have a high resistance to softening due to tempering and a favorable distribution of residual stress, so that they are resistant to fatigue and impact. Therefore, it is used for surface hardening of gears, shafts, cams, pins, bearings, etc. (see, for example, Patent Document 1 or Patent Document 2).

Further, conventionally, in the threshing section of a combine, the cereal is threshed by rotation of a handling cylinder that is axially mounted in the front-rear direction of the machine body, and the threshed grain is placed below the threshing device. Wind sorting and specific gravity sorting are performed by the rocking sorter. After this sorting, from the first conveyor, the koji (fine grains) as the first thing is stored in the Glen tank, and from the second conveyor, grains or swarf with a low specific gravity are sent to the sorting section or as the second thing. It is returned to the threshing part.
The first conveyor is connected to the first cereal conveyor and conveyed upward, and then stored in the Glen tank. Further, the second product collected on the second conveyor is transported upward by the second reduction conveyor, then forwarded by the second reduction conveyor, again put into the handling chamber, and subjected to re-sorting.

In addition, as a place to transfer these various conveyors, the first transfer unit that transfers and conveys the first item from the first conveyor to the cereal conveyor, and the second item that transfers and conveys the second item from the second conveyor to the second reduction conveyor Two succeeding sections are provided (see, for example, Patent Document 3 or Patent Document 4).
Japanese Patent Laid-Open No. 11-6526 JP 2003-239981 A Japanese Examined Patent Publication No. 7-41968 Japanese Utility Model Publication No. 5-15732

  The spiral conveyor (screw blade) at the tip (passage part side) of various conveyors such as the first conveyor and the cereal conveyor disposed inside the first transfer part or the second transfer part is inherited. The direction is changed in the department and it is easy to wear because it inherits transported items such as grains. Therefore, the screw blades at the front end portion (passage portion side) of the conveyor are designed so that the diameter of the spiral blade is larger and the wall thickness is thicker than the screw blades other than the front end portion. By increasing the diameter in advance, the conveying force is increased to increase the efficiency of inheritance.

However, the surface of straw, grains, swarf, etc., which is a conveyed product, is scratched, and the surface of the conveyor, particularly the surface of the screw blade, is worn. For example, in the case of a cereal conveyor, from the inheritance part to the spout part It was worn in a tapered shape. In particular, the feed blades of the screw blades are easily worn, are not sharp, are rounded, have a reduced diameter, and have a reduced conveying capacity.
For this reason, the conveyor tip has been conventionally surface-treated by carbonitriding.
However, as long as local wear acts in addition to the tip portion, it is difficult to say that early peeling and early wear caused by this cannot be satisfactorily suppressed, and it is difficult to say that it is sufficient in terms of durability or long life.

In addition, there is a possibility that an error in the length of the conveyor may occur during the carbonitriding process, or the lead may be shaken.
In particular, in a cereal conveyor etc. in which the entire conveyor surface is worn in a tapered shape, the entire conveyor surface is subjected to carbonitriding to increase durability, but carbonitriding is performed on a long conveyor. In this case, the hardness increases and the distortion makes it difficult to incorporate it into the conveyor shaft, and the distortion makes it difficult to obtain the full length dimension.

  In other words, the problem to be solved is that, in the screw conveyor type conveyor device, the portion where the load due to the contact with the conveyed material is large is not limited to the tip portion of the screw conveyor. Even if it is strengthened by thickening or surface hardening treatment, it is not possible to improve the durability of the screw conveyor or to extend its life.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

That is, in claim 1, in the grain conveying conveyor device comprising a screw conveyor having a conveyor shaft and a spiral conveyor fixed to the conveyor shaft,
The conveyor is divided into a plurality of parts, and carbonitriding is performed on the entire surface of at least one of the divided conveyors.

In Claim 2, in the conveyor apparatus for grain conveyance which changes a conveyance direction in the conveyance succession part of a screw conveyor combining several screw conveyors,
The spiral conveyor arranged on the conveyor shaft is divided into a plurality of parts and continuously arranged, and the thickness of at least one or both of the conveyer lower side and the upper conveyer side located in the conveyer unit is set to the thickness of the other conveyer. It was thicker than the wall thickness.

In Claim 3, in the conveyor apparatus for grain conveyance which changes a conveyance direction in the conveyance succession part of a screw conveyor combining several screw conveyors,
A spiral conveyor arranged on the conveyor shaft is divided into a plurality of parts and continuously arranged, and carbonitriding is performed on the entire surface of at least one or both of the conveyors on the conveyance lower side and / or the conveyance upper side located in the conveyance transfer unit. It is a thing.

In Claim 4, in the conveyor device for grain conveyance which changes a conveyance direction in the conveyance succession part of a screw conveyor combining several screw conveyors,
The spiral conveyor arranged on the conveyor shaft is divided into a plurality of parts and continuously arranged, and the thickness of at least one or both of the conveyer lower side and the upper conveyer side located in the conveyer unit is set to the thickness of the other conveyer. It is thicker than the wall thickness and is carbonitrided over the entire surface.

  In claim 5, among the plurality of screw conveyors of the grain conveying conveyor device, the conveying topmost conveyor is the first conveyor of the threshing unit, and the conveying lowest conveyor is connected to the Glen tank. is there.

  In claim 6, among the plurality of screw conveyors of the grain conveying conveyor device, the conveying uppermost side is used as the second conveyor of the threshing portion, and the conveying lowermost screw conveyor is used as a return port to the threshing portion. It is a communication.

  As effects of the present invention, the following effects can be obtained.

In claim 1, by forming a surface hardened layer on the entire conveyor subjected to carbonitriding, to suppress the occurrence of local wear and local stress, to avoid problems of early peeling and early wear, Even at a location where a load due to inheritance of a conveyed product is greatly applied, it is possible to improve durability such as wear resistance and fatigue strength of the conveyor and to extend its life.
In addition, by dividing the conveyor into multiple parts in the longitudinal direction, distortion when the hardness is increased by carburizing treatment, etc. can be reduced, variation in length can be reduced, and screws can be incorporated into the conveyor case due to distortion. It is possible to prevent the situation that cannot be done.
Moreover, since the screw is divided even if the length variation occurs, the variation can be absorbed by changing the overlap allowance.

  In Claim 2, in the transfer part of a conveyor and a conveyor, the thickness of the divided screw blade | wing (passage side screw blade | wing) of conveyance upstream (scraping blade | wing is arrange | positioned downstream of conveyance) was divided | segmented into another. By making it thicker than the thickness of the screw blade (conveying screw blade), the wear resistance is improved and the conveying performance can be improved.

  In Claim 3 and Claim 4, when changing a conveyance direction in the conveyance succession part of a screw conveyor, a to-be-conveyed object is easy to stagnate and the screw near such a conveyor case tends to wear. Even in places where inheritance of such transported goods is severe, by performing carbonitriding treatment on the entire conveyor to form a hardened surface layer, it is possible to improve durability and length of the conveyor such as wear resistance and fatigue strength. Life can be extended.

  In claim 5, the grain conveying conveyor that conveys the straw vertically to the Glen tank has been improved in durability such as wear resistance, fatigue strength, etc., so that the bottom (conveying part) in the conveyor case Therefore, it is possible to improve the wear resistance of the screw of the conveyor against a large amount of traps temporarily accumulated.

  In claim 6, the grain conveyor for conveying the second product to the reducing port to the threshing portion has been subjected to durability improvement such as wear resistance and fatigue strength, so that the bottom of the conveyor case ( It is possible to improve the wear resistance of the screw of the conveyor against a large amount of traps temporarily accumulated in the transfer section.

Next, embodiments of the invention will be described.
1 is a left side view showing the overall configuration of a combine according to an embodiment of the present invention, FIG. 2 is a plan view of the same, FIG. 3 is a sectional side view of the entire threshing portion, and FIG. 4 is an overall view of the threshing portion. FIG. 5 is a side view showing the blade structure of the second article charging unit, FIG. 6 is a front view showing the blade structure of the second article charging unit, and FIG. 7 is equipped with the first conveyor and the cereal conveyor. The front view of a 1st transfer part, FIG. 8 is the front view of the 2nd transfer part which equipped the 2nd conveyor and the 2nd reduction | restoration conveyor, FIG. 9 is the front view of the cereal conveyor comprised from several division conveyors, FIG. 10A is a diagram viewed from X in FIG. 9, and FIG. 10B is a diagram viewed from Y in FIG.

First, the whole structure of the combine 1 which concerns on this invention is demonstrated using FIG. 1 or FIG.
An airframe frame 3 is placed on the crawler type traveling device 2, and a pulling / reaping part 4 is disposed at the front end of the airframe frame 3 so as to be movable up and down. A weeding board 5 for weeding cereals protrudes from the front end of the pulling / cutting part 4, and a raising case 6 (raising device) is erected on the rear part of the weeding board 5. ing.
And the tine 7 protrudes from the raising case 6, the cereal is caused by the upward movement of the tine 7 from below, and the cutting blade 8 disposed at the rear portion of the weed plate 5 It is configured to reap the cereal stock. The harvested corn straw is conveyed backward by the lower conveying device, the upper conveying device, and the vertical conveying device, and the stock is inherited by the feed chain 9 from the upper end of the vertical conveying device and conveyed into the threshing unit 10. The threshing unit 10 has a feed cylinder 9 stretched to the left side and a handling cylinder 11 and a processing cylinder 12 incorporated therein.
A waste transport chain 13 is disposed at the rear end of the feed chain 9, and a waste cutter device 15, a diffusion conveyor and the like are disposed below the rear of the waste transport chain 13 and the waste transport tine 14. A processing unit 16 is formed. The waste disposal unit 16 cuts the waste into pieces, and then uniformly discharges it to the field while diffusing, or bypasses the waste cutter device 15 and releases it without cutting.

  A sorting unit 17 is disposed below the threshing unit 10, and the sorting unit 17 sorts the grain from grains and sawdust flowing down from the threshing unit 10. It is transported and stored in a grain tank 19 disposed on the side of the threshing unit 10 via the conveyor 18 so that sawdust and the like are discharged to the outside of the feeder.

  A driving unit 20 is configured in front of the Glen tank 19, and the driving unit 20 includes a driver seat 21 and a driving operation unit 22.

Next, the screening unit 17 of the threshing apparatus will be described with reference to FIGS.
In the sorting unit 17, the rocking sorting by the rocking sorter 28 and the wind sorting by the tang 29 are performed, so that the sorting is made into the first thing, the second thing, the sawdust, and the like.

The swing sorter 28 includes a feed pan 30 positioned below the front portion of the handling net 26, a chaff sheave 31 positioned below the rear portion of the handling net 26, a grain sheave 32 disposed below the chaff sheave 31, and the like. The swing sorter 28 is stored in the machine casing 33. The front end portion of the swing sorter 28 extends to a position below the front end of the handling cylinder 11, and a sieve line 34 is integrally attached to the rear of the swing sorter 28.
A swing link 23 is provided at the front part of the swing sorter 28 and a guide roller 24 is provided at the rear part thereof, and the swing sorter 28 swings forward and backward with respect to the machine frame 33 via them. It is supported freely.

  The opening degree of the chaff sheave 31 can be adjusted according to the amount of processed material put into the swing sorter 28, and the grains and fine swarf fall down through the chaff sheave 31, Swarf and the like larger than the opening of the chaff sheave 31 are conveyed backward. At this time, a sorting wind is generated from the front of the sorting unit 17 to the rear of the sorting unit 17 between the chaff sheave 31 and the Glen sheave 32, and a part of the fine swarf is blown back and separated from the grain. .

  Further, a tang 29 is arranged below the feed pan 30 and below the front part of the conveyor 36 of the swing sorter 28 so as to blow the sorter air to the chaff sheave 31 and the grain sheave 32.

Then, the suction / exhaust dust fan 40 is opposed to the dust exhaust port at the rear end of the processing chamber above the sieve line 34 so as to face the suction port 40A, and laterally disposed on the side of the rear end portion of the swing sorter 28, The grain threshed by the handling cylinder 11 and the processing cylinder 12 is selected by the swinging sorter 28, and only the refined grains are taken out to the Glen tank 19, and the waste conveying chain 13 and the waste conveying tine 14 are removed. It is configured so as to be sent to the waste disposal unit 16 having the waste cutters 15A and 15B and discharged outside the machine after cutting.
In addition, dust that has been carried on the flow of the sorting air supplied from the tang 29, dust generated during threshing, and the like are sucked by the suction / discharge dust fan 40 and discharged to the outside.

  Further, at the midway position before and after the rocking sorter 28, a first conveyor 36 and a second conveyor 37, both of which are screw conveyors, are installed in parallel in the front and rear direction. The positional relationship between the first conveyor 36 and the second conveyor 37 is such that the first conveyor 36 is closer to the tang 29 (front part of the machine frame 33) and the second conveyor 37 is farther from the tang 29 (rear part of the machine frame 33). )

  The right end of the first conveyor 36 communicates with the lower part of the cereal conveyor 18 provided such that its longitudinal direction (conveying direction) is substantially in the vertical direction. Communicate.

  In such a configuration, the mixture of grains, shoots attached grains, immature grains, fine swarf, etc. that have been introduced into the sorting unit 17 and leaked to the rocking sorter 28 leaked onto the chaff sheave 31. In the process, a part of the fine swarf is blown back by the air flow from the front to the rear of the sorting unit 17 generated by the tang 29. Mixtures such as grains that have leaked onto the chaff sheave 31, branch sticky grains, immature grains, and fine swarf are conveyed backward by the swinging of the swing sorter 28. At this time, the grains, immature grains, branch sticking grains, fine swarf and the like fall below the opening of the chaff sheave 31, and the large swarf is conveyed to the rear of the chaff sheave 31 and is subjected to a sieving action at the sieving line 34. After that, it is discharged out of the machine.

  Grains, immature grains, branch rachis adhering grains, fine shavings, and the like that have dropped from the opening of the chaff sheave 31 leak onto the glen sieve 32. At this time, a part of the fine swarf is blown away and separated by the sorting air from the tang 29.

  Of the grains, immature grains, shoots adhering grains, fine swarf, etc. that have leaked onto the grain sieve 32, the cereal grains, immature grain, fine swarf, etc. leak through the grain sieve 32 and fall downward. . At this time, the heaviest grain (first) is collected in the first collection unit 41 (the bottom of the sorting unit 17 provided at the back of the tang 29 and containing the first conveyor 36). It is conveyed from the first conveyor 36 to the grain tank 19 through the cereal conveyor 18.

  On the other hand, the unprocessed material in which immature grains having a small weight, a part of fine swarf, spiked grains, grains and the like are mixed is blown backward by the sorting wind from the tang 29, and the second recovery unit 42 (one Is recovered from the second conveyor 37 through the second reduction conveyor 43, and the handling chamber and feed. Re-loaded on bread 30 or chaff sheave 31.

  As shown in FIG. 3, the waste disposal unit 16 is provided with a suction / exhaust dust fan 40 at a position immediately after the threshing unit 10 (handle cylinder 11) and at a rear upper position of the sorting unit 17. Is disposed at a position immediately after the. The waste cutter device 15 includes a large-diameter cutter blade 15A and a small-diameter cutter blade 15B.

The structure in the spout part 43C of the second reduction conveyor 43 will be described with reference to FIGS.
The feed start end of the second reduction conveyor 43 is connected to and linked to the feed end of the right end of the second conveyor 37. A scraping blade 43D is provided on the feed end of the second reduction conveyor shaft 43A in the spout portion 43C of the second reduction conveyor 43. The scraping blade 43D is a plate-shaped blade extending in the radial direction from the circumferential surface of the second reduction conveyor shaft 43A in the spout portion 43C, and the lower end of the scraping blade 43D extends to the scraping blade 43D. A screw blade (spiral conveyor) 43B provided in a spiral shape on the peripheral surface is connected to a feed end of a screw blade 43B, and a scraping blade 43D is provided continuously to the feed end of the screw blade 43B.

Further, as apparent from the phantom line rotated approximately 90 degrees from the position of the scraping blade 43D shown by the solid line in FIG. 5, the scraping blade 43D is provided with a lead angle β opposite to that of the screw blade 43B. It is tilted with respect to the core. That is, the upper end of the scraping blade 43D is located at a position advanced about 10 degrees in the rotation direction A of the second reduction conveyor shaft 43A compared to the lower end.
Further, a bent portion 43E is provided by bending the radial tip edge of the scraping blade 43D in the rotation direction A by a predetermined angle α (approximately 45 degrees). Accordingly, the scraping blade 43D is provided with the bent portion 43E, so that the second thing is further moved away from the second return port 64 to the inside of the threshing machine housing than the one without the bent portion 43E. It is possible to prevent the second product from being reduced by moving to the right side of the swing sorter 28.

Further, when the bent portion 43E is provided on the scraping blade parallel to the axis of the second reduction conveyor shaft 43A that does not have the lead angle β, the second thing is thrown obliquely upward, and the machine frame There is a risk of clogging between the right side plate 49A and the handling net 26 along the handling net 26 above the swinging sorter 28 inside the second reducing port 64. By providing the lead angle β, it is possible to prevent the second object from jumping up and to fly obliquely downward, and to prevent the second object from clogging between the right side plate 49A and the handling net 26.
Due to the bent portion 43E and the scraping blade 43D having the reverse lead angle β, the second item is blown obliquely downward from the second reduction port 64 to the inside of the threshing machine housing, and from the lower side avoiding the handling net 26. It is uniformly placed on the feed pan 30 at the front of the swing sorter 28. In addition, the height of the second article gradually increases toward the feed end side of the second reduction conveyor shaft 43A, and the handling net 26 approaches the right side plate 49A, but the scraping blade 43D is second as the feed end is approached. This is effective because the action of directing the flying direction of the object downward becomes stronger.

The power transmission mechanism from the first conveyor to the cereal conveyor will be described in detail with reference to FIG.
The first transfer part of the first conveyor shaft 36A disposed in the horizontal direction in the first transfer part 125 in which the wind-sorted / specific gravity-selected rice cake is laterally fed and transferred from the first conveyor 36 to the cereal conveyor 18. A spline is formed on the outer periphery of the front end portion on the 125 side, and a bevel gear having a spline boss portion formed on the inner side is fitted (spline fitting) so as not to be relatively rotatable. The bevel gear 126 is spline-fitted to the first conveyor shaft 36A, and on the other hand, on the outer periphery of the first transfer portion 125 side of the cereal conveyor shaft 18A (because the cereal conveyor 18 is arranged in the vertical direction, the lower end). Further, the bevel gear 127 is spline-fitted, and both the bevel gears 126 and 127 are always meshed.
The positional relationship between the first conveyor 36 and the cereal conveyor 18 in the first transfer section 125 via the bevel gears 126 and 127 is configured as an “L” shape when viewed from the front.

  Also, bearings 128 and an oil seal 129 as a sealing material are interposed at the end of the first conveyor shaft 36A and the cereal conveyor shaft 18A on the first transfer portion 125 side. The gap between the housing case and the shaft is completely sealed.

  By configuring as described above, the grain threshed by the handling cylinder 11 is selected by the swinging sorter 28 below, and only the straw is taken out by the conveyor 36 to the outside of the side face of the threshing unit 10. Grain conveyer shaft of the cereal conveyor 18, which is put into the grain tank 19 and stored in the grain tank 19 from the grain spout portion at the upper end of the cereal conveyor 18, which is inherited by the grain conveyor 18 and faces the grain tank 19. The lower end of 18A is interlocked and connected to the first conveyor shaft 36A in the left and right lateral direction via a pair of bevel gears 126 and 127, so that the cereal conveyor 18 is driven.

  As shown in FIG. 8, the power transmission mechanism from the second conveyor to the second reduction conveyor, specifically the internal configuration of the second transfer section 132, is substantially the same as the first transfer section 125 (see FIG. 7). It has an internal configuration.

  Next, the screw conveyor comprised from the some division conveyor which concerns on this invention is demonstrated using FIG.

A screw conveyor is rotatably provided in the first conveyor 36, the cereal conveyor 18 and the like, which are conveyor devices according to the present invention, and this screw conveyor has two or more spiral conveyors (screw blades). Consists of And each screw blade | wing is arranged in parallel on the same axis line, and each edge part is fixed by welding etc., and comprises one conveyor blade | wing.
In the present embodiment, the case of the cereal conveyor 18 will be described with reference to FIG.

  In the present embodiment, the cereal conveyor 18 accommodates screws in a conveyor case, and the screw is composed of a cereal conveyor shaft 18A, a screw blade 18B, a scraping blade 18C, and the like. 18BA and a conveying screw blade 18BB.

  The cereal conveyor 18 rotatably supports both sides through a cereal conveyor shaft 18A at the center of the cereal conveyor case 18D through bearings and the like, and a strip-shaped steel plate is provided around the cereal conveyor shaft 18A as screw blades 18B. It is fixed in a spiral manner by welding or the like, and the cereal conveyor shaft 18A is rotated, so that the straw that is the conveyed product can be conveyed upward.

There are two types of screw blades 18B, and a thick and large passing side screw blade 18BA is wound around the tip of the cereal conveyor shaft 18A opposite to the scraping blade 18C. In the middle of the grain conveyor shaft 18A, a conveying screw blade 18BB having a smaller wall thickness than the transfer side screw blade 18BA is wound and fixed.
On the cereal conveyor shaft 18A, the joint between the end of the inherited screw blade 18BA and the end of the conveying screw blade 18BB, and the joint between the end of the conveying screw blade 18BB and the end of the conveying screw blade 18BB are as follows. Parts are overlapped and fixed by welding or the like to integrally form a screw.
Differences in the thickness of the transfer-side screw blade 18BA and the conveying screw blade 18BB at each joint are as shown in the cross-sectional views of FIGS. 10 (a) and 10 (b).

By dividing the screw blade into a plurality of parts in the longitudinal direction in this way, distortion when the hardness is increased by carburizing treatment, which will be described later, can be reduced, and variation in length can be reduced. The situation that cannot be incorporated can also be prevented.
Moreover, even if distortion in the longitudinal direction occurs, the overall length is set to the specified length by adjusting the amount of overlap at the portion where the screw blades are connected (see FIGS. 10A and 10B). It is possible.
Moreover, in the transfer part of a conveyor and a conveyor, the thickness of the divided | segmented screw blade | wing (passage side screw blade | wing 18BA) of the conveyance upstream side (scraping blade | wing 18C is arrange | positioned downstream of conveyance) of the cereal conveyor 18 is set to other thickness. By making it thicker than the thickness of the divided screw blades (conveying screw blades 18BB) and increasing the diameter, the wear resistance is improved and the conveying performance can be improved.
Moreover, the thickness of the screw blades on the lower conveyance side of the first conveyor 36 in the transfer section of the first conveyor 36 and the cereal conveyor 18 can be configured to be thicker than the thickness of the other screw blades. Moreover, the thickness of the screw blades on both the lower conveyance side and the upper conveyance side of the transfer part can be increased.

  Next, the carbonitriding process on the entire conveyor surface according to the present invention will be described.

A gap is provided between the screw blades and the conveyor case, but there are cases in which sawdust or the like is bitten between the screw blades and the conveyor case. If it is forcibly conveyed, the screw blades are severely damaged and worn.
Also, the vertical transport is less efficient and the degree of wear is greater than the horizontal transport.
In addition, since the conveyance is easily collected at the lowermost part in the vertical conveyance, for example, the tip of the first conveyor 36 and the cereal conveyor 18 corresponding to the first transfer part 125 has a screw blade 18BB having a diameter of the screw blade 18BA of the other portion. Larger than the diameter and thick.
However, as long as local wear acts in addition to the tip portion, it is difficult to say that early peeling and early wear caused by this cannot be satisfactorily suppressed, and it is difficult to say that it is sufficient in terms of durability or long life.
Therefore, the present invention is intended to improve durability and extend the life by performing carbonitriding on the entire surface of the conveyor including the screw blades.
Moreover, carbonitriding can also be performed on the entire surface of the screw blades on at least one or both of the upper transfer side and the lower transfer side in the above-described transfer section. That is, the carbonitriding process can be performed on the screw blade having a large thickness.

As a method of carbonitriding, the processed material (conveyor in the present embodiment) is heated in a vacuum, and vacuum gas carbonitriding performed by introducing carburizing and nitriding gases, or using a medium as plasma and reducing the pressure. There is a method such as plasma carbonitriding using glow discharge generated between an anode treated object (conveyor in this embodiment) and an anode in a carburizing and nitriding gas atmosphere.
The carbonitriding process is performed on the entire surface of the conveyor including screw blades such as the first conveyor 36, the cereal conveyor 18, the second conveyor 37, and the second reduction conveyor 43.

  Since the carbonitriding method is not particularly limited, a known vacuum gas carbonitriding method or another carbonitriding method may be used. The temperature is not particularly limited, and may be 850 to 970 degrees that is normally performed, or may be another temperature. The treatment time may be appropriately selected according to the required depth of the carbonitriding layer.

  As described above, carbonitriding is performed on the entire conveyor to form a hardened surface layer, thereby suppressing the occurrence of local wear and local stress, avoiding problems of early peeling and early wear, and conveying Even in places where inheritance of materials is severe, it is possible to improve the durability such as wear resistance and fatigue strength of the conveyor and to extend the service life.

  The conveyor according to the present invention is used for feeding and discharging grains such as rice, wheat, soybeans and buckwheat in facilities such as threshing devices, harvesting devices, drying devices, and country elevators. It can be widely used as a means to do this.

The left view which showed the whole structure of the combine which concerns on one Example of this invention. Similarly the whole top view. The cross-sectional side view of the whole threshing part. The cross-sectional top view of the whole threshing part. The side view which shows the blade | wing structure of a 2nd thing insertion part. The front view which shows the blade | wing structure of a 2nd thing insertion part. The front view of the 1st inheritance part equipped with the first conveyor and the cereal conveyor. The front view of the 2nd inheritance part which equipped the 2nd conveyor and the 2nd reduction | restoration conveyor internally. The front view of the grain raising conveyor comprised from a some division conveyor. (A) is the figure seen from X in FIG. 9, (b) is the figure seen from Y in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Threshering part 18 Grain conveyor 18A Grain conveyor shaft 36 First conveyor 36A First conveyor shaft 18B / 36B / 43B Screw blade 37 Second conveyor 43 Second reduction conveyor 43A Second reduction conveyor shaft 43C Spout 125 125 First Succession part 126/127 Bevel gear 128 Bearing 129 Oil seal 132 Second succession part

Claims (6)

In the grain transporting conveyor device that is rotatably provided with a screw conveyor including a conveyor shaft and a spiral conveyor fixed to the conveyor shaft,
A conveyor apparatus for grain transportation, wherein the conveyor is divided into a plurality of parts, and carbonitriding is performed on the entire surface of at least one of the divided conveyors. In the grain conveyor device that combines a plurality of screw conveyors and changes the conveying direction at the conveying succession portion of the screw conveyor,
The spiral conveyor arranged on the conveyor shaft is divided into a plurality of parts and continuously arranged, and the thickness of at least one or both of the conveyer lower side and the upper conveyer side located in the conveyer unit is set to the thickness of the other conveyer. A conveyor device for conveying a grain, characterized in that it is thicker than the wall thickness. In the grain conveyor device that combines a plurality of screw conveyors and changes the conveying direction at the conveying succession portion of the screw conveyor,
A spiral conveyor arranged on the conveyor shaft is divided into a plurality of parts and continuously arranged, and carbonitriding is performed on the entire surface of at least one or both of the conveyors on the conveyance lower side and / or the conveyance upper side located in the conveyance transfer unit. A conveyor device for conveying a grain, In the grain conveyor device that combines a plurality of screw conveyors and changes the conveying direction at the conveying succession portion of the screw conveyor,
The spiral conveyor arranged on the conveyor shaft is divided into a plurality of parts and continuously arranged, and the thickness of at least one or both of the conveyer lower side and the upper conveyer side located in the conveyer unit is set to the thickness of the other conveyer. A conveyor device for conveying a grain, characterized in that it is thicker than a wall thickness and is carbonitrided over the entire surface.   3. The plurality of screw conveyors of the grain conveying conveyor device, wherein the conveying uppermost side is the first conveyor of the threshing unit, and the conveying lowermost screw conveyor is communicated with the Glen tank. Or the conveyer apparatus for the grain conveyance of Claim 3 or Claim 4.   Among the plurality of screw conveyors of the grain conveying conveyor device, the conveying uppermost side is used as the second conveyor of the threshing unit, and the conveying lowermost side screw conveyor is communicated with the reducing port to the threshing unit, The grain conveyor apparatus according to claim 2, claim 3, or claim 4.

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