JP2006271241A - Screw transport structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a screw transport structure capable of being assembled without misplacement, when the structure is so designed that a rear end of a screw shaft on an upstream side of transport and a starting end of a screw shaft on a downstream side of the transport are synchronized and coupled with each other through a bevel gear. <P>SOLUTION: In this screw transport structure, cross-sectional shapes of a gear coupling part 25a of the screw shaft 25 and a central engagement hole of the bevel gear 35 engaged and coupled therewith are formed into such shapes that engagement of the coupling part and the engagement hole is allowed at only one specified rotational phase. It is preferable that a pair of flat cut surfaces S1, S2 facing each other in parallel is positioned on an outer circumferential surface of the gear coupling part 25a of the screw shaft 25, and further a flat cut surface S3 is positioned on one of outer circumferential surfaces located between the flat cut surfaces S1, S2 on the shaft and facing each other . <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a screw conveying structure used for conveying a first item (grain) or a second item in a threshing device mounted on a combine, or a device for carrying out a grain stored in a grain tank.

  The screw transport structure used for transporting the 1st and 2nd products is the grain of the 1st and 2nd products that are laterally transported by the 1st lateral feed screw or 2nd lateral feed screw of the threshing device. It is delivered to the lower end of the screw to be pumped to the tank or the second reduction screw. Moreover, in the delivery apparatus of the grain stored in the grain tank, the grain that has been laterally fed by the bottom screw arranged at the bottom of the grain tank is supplied to the lower end of the vertical feed screw conveyor, and the vertical feed screw conveyor The lifted grain is configured to be fed to the start end of a transverse feed screw conveyor that can swing and swivel up and down.

In the screw conveyance structure in which the grains are sequentially transferred across a plurality of screws as described above, the rear end of the screw shaft on the upper conveyance side and the start end of the screw shaft on the lower conveyance side are incorporated in the gear case. An interlocking structure that interlocks and connects via a bevel gear is often used (see, for example, Patent Documents 1 and 2).
JP 2001-204233 A JP 2004-201651 A

  In the screw conveying structure, each screw shaft is inserted and connected to the center hole of a pair of bevel gears assembled and engaged with the gear case by spline fitting or oval hole fitting. The mating phase can be changed, and in the small hole mating, the mating can be reversed by 180 °, and when it is inserted in a random manner, the end of the screw blade in the upper screw and the lower screw The rotation phase with the screw blade start end becomes out of phase and smooth grain delivery cannot be performed, the conveying ability at the screw crossing portion is lowered, and the grain is easily damaged or clogged. In particular, in the case of the upper screw with a screw discharge plate at the end of the screw blade, more appropriate phasing is performed so that the grain delivered by the discharge plate is smoothly inherited at the screw blade start end of the lower screw. Is required.

  Therefore, in the past, labeling with the assembly direction specified was affixed to the gear case to avoid misassembly. However, the preparation of the label and its affixing work were separately required, resulting in high costs. It was one of the causes.

  The present invention has been made paying attention to such a point, and an object of the present invention is to provide a screw conveyance structure that can be assembled without erroneous assembly.

1st invention is the screw conveyance structure which connected the back end of the screw shaft of the conveyance upper side, and the start end of the screw shaft of the conveyance lower side via the bevel gear,
The cross-sectional shape of the gear coupling portion of each screw shaft and the center fitting hole of the bevel gear fitted and connected thereto is set to a shape that allows mutual fitting only in one specified rotational phase. It is characterized by.

  According to the above configuration, the screw shaft and the bevel gear corresponding to the screw shaft are fitted and connected only at one specified rotational phase, and each screw is inserted into the center fitting hole of the pair of bevel gears engaged at a predetermined phase. By simply inserting and fitting the gear connecting portion of the shaft, the terminal end of the screw blade on the conveying upper screw shaft and the starting end of the screw blade on the lower screw shaft rotate while maintaining a predetermined phase relationship.

  Therefore, according to the first aspect of the present invention, it is possible to perform assembling without erroneous assembly without requiring a label specifying the assembling direction.

According to a second invention, in the first invention,
The outer peripheral surface of the gear connecting portion of the screw shaft is provided with a pair of flat cut surfaces facing each other in parallel, and one of the shaft outer peripheral surfaces facing each other between the flat cut surfaces is provided with a flat cut surface. It is.

  According to the above configuration, the three flat cut surfaces formed in the gear connecting portion of the screw shaft exhibit the functions of the mating phase matching surface and the torque transmission surface, and bring about the above-described effect of the first invention, and at the same time, Torque can be reliably transmitted through the cut surface.

According to a third invention, in the first invention,
A pair of flat cut surfaces facing the non-parallel state are provided on the outer peripheral surface of the gear connecting portion of the screw shaft.

  According to the above configuration, there are only two cuts on the outer peripheral surface of the gear connecting portion of the screw shaft, which brings about the effects of the first invention and is effective in reducing machining costs.

  FIG. 1 shows a longitudinal side view of a self-removing threshing apparatus provided with a screw conveyance structure according to the present invention. This threshing device is used by being mounted on a combine, and feed chain 1 feeds a harvested cereal meal that has been harvested by a harvesting unit provided on the left side of the figure in FIG. In the state that the head portion is inserted into the handling chamber 2, the threshing process is carried out by the handling cylinder 3 that is pivotally supported in the front and rear horizontally in the handling chamber 2 by moving it from the left to the right in the figure. The separated processed product is sorted by the receiving net 4 stretched along the lower part of the handling chamber, and the fine treated product that has leaked through the receiving net 4 is placed in the first half of the swing sorting unit 5 arranged below the handling chamber 2. In addition to dropping and supplying, a large processed material that has not leaked through the receiving net 4 is taken out from the dust feed port 6 at the end of the handling chamber, dropped and supplied to the middle part of the swing sorting unit 5 and dropped to the swing sorting unit 5 The supplied processed product is received by a rocking sorting case 7 which is long in the front and rear direction, and the placed processed product is rearward (in FIG. 1). Sift sorting is performed using a front chaff sheave 8 for coarse sorting, a grain sheave 9 for fine sorting, a sorting rack 10 for loosening, a rear chaff sheave 11, a Strollac 12, etc. Along with the sorting wind supplied toward the rear upper side from the Kara 13 provided at the front end of the sorting section, the wind selection process is performed, and the grains leaked from the Glen sieve 9 are sorted and collected in the first collecting section 14, The second thing leaked from the rear chaff sheave 11 or the stroller 12 is selected and collected by the second collecting unit 15.

  The grains recovered in the first recovery unit 14 are laterally fed to the outside by the lateral feed screw 16 and then pumped by the screw-type harvesting device 17 to collect the grain tank or other recovery unit (not shown). ) And the second product collected in the second collection unit 15 is laterally fed by the lateral feed screw 18 and then fed by the screw-type second reduction device 19 to the front part of the swing sorting case 7. It is configured to be supplied with reduction and undergo a re-sorting process.

  In addition, a dust exhaust fan 20 composed of a cross-flow fan is placed horizontally at the rear upper part of the swing sorting unit 5 at the rear upper part of the swing chamber 2 so as to be positioned below the exhaust fan transport path. Dust and straw scraps blown out from the dust feed port 6 formed at the end of the dust, and dust dust and straw scraps blown up to the rear upper part of the swing sorting portion 5 by the sorting wind are sucked into the dust exhaust fan 2 and forcibly It is designed to be discharged to the rear of the aircraft. Further, above the dust exhaust fan 20, there is provided a waste wall transport device 21 in which a tip end side locking transport mechanism 21 a and a stock-side clamping transport mechanism 21 b are obliquely arranged in parallel. The waste straw processing device (Fig. 1), such as the waste straw cutter, the waste straw binding device, the waste straw dropper, etc., which is transported obliquely toward the tip and rearward, and is mounted on the rear end of the threshing device. (Not shown).

  Further, a hexagon-shaped processing rotary body 22 for rotational removal driven coaxially with the handling cylinder 3 is disposed behind the handling chamber 2, and is sandwiched by the feed chain 1 and carried out from the handling chamber 2. By swaying the waste straw that has been struck from above with the processing rotator 22, the grains stuck in the waste straw are separated and recovered by falling.

  The lifting device 17 is driven by the lateral feed screw 16 in conjunction with the bevel gear, and the second reduction device 19 is driven by the lateral feed screw 18 in conjunction with the bevel gear, and each interlocking structure is the same. Therefore, as an example, the interlocking structure of the transverse feed screw 16 and the lifting device 17 will be described below with reference to the drawings.

  As shown in FIG. 4, the transverse feed screw 16 is configured by welding a screw blade 26, a scraping plate 27, and a bearing cover 28 to a screw shaft 25, and an end of the screw shaft 25 on the lower conveyance side is formed. It is inserted and supported in a gear case 29 provided on the lateral side of the threshing device 4. In addition, the lifting device 17 is configured by including a longitudinal feed screw 31 in a conveying cylinder 30 and a lower end portion of a screw shaft 34 welded to a screw blade 32 and a bearing cover 33 is inserted and supported in the gear case 29. .

  A pair of bevel gears 35, 36 engaged perpendicularly to the gear case 29 are supported by bearings, and are formed at the end portions of the screw shafts 25, 34 in center fitting holes 35 a, 36 a of the bevel gears 35, 36. The gear connecting portions 25a and 34a are respectively inserted and fitted.

  As shown in FIG. 5, the gear coupling portions 25a and 34a of the screw shafts 25 and 34 are provided with a pair of flat cut surfaces S1 and S2 opposed to each other in parallel on the outer peripheral surfaces thereof, and the flat cut surfaces S1 and S2 of both the flat cut surfaces S1 and S2. As shown in FIG. 6, the center fitting holes 35a and 36a of the bevel gears 35 and 36 have the flat cut surface S3 on one of the shaft outer peripheral surfaces facing each other. The screw shafts 25 and 34 and the bevel gears 35 and 36 can be fitted and connected to each other only at one specified rotational phase.

  Alignment marks ma and mb are respectively formed on the end surfaces of the boss portions of the bevel gears 35 and 36 and the end surfaces of the bearing boss portions of the gear case 29. The bevel gears 35 and 36 are connected to the gear case 29 using these alignment marks ma and mb. In the assembled state, the screw shafts 25 and 34 are inserted and fitted into the bevel gears 35 and 36, respectively, so that the transverse feed screw 16 and the longitudinal feed screw 31 are interlocked and connected while maintaining a predetermined rotational phase relationship. It will be.

  In this way, the laterally feeding screw 16 and the longitudinally feeding screw 31 are interlocked and connected in the phase-matched state, so that the grain laterally fed by the laterally feeding screw 16 is scraped up by the scraping plate 27 at the end of its conveyance. Immediately after being scraped up, it is picked up at the starting end of the screw blade 32 of the longitudinal feed screw 31 and smoothly lifted.

  [Other Examples]

  (1) As a structure for fitting and connecting the screw shafts 25 and 34 and the bevel gears 35 and 36 only at one specified rotational phase, as shown in FIG. The outer peripheral surface of 34a is provided with a pair of flat cut surfaces S4 and S5 that face each other in a non-parallel state, and has center fitting holes 35a and 36a of the bevel gears 35 and 36 in a shape that matches the cross-sectional shape of the gear connecting portions 25a and 34a. It is also possible to carry out by forming a cross-sectional shape.

  (2) As shown in FIGS. 9 and 10, processing teeth 23 a obtained by bending a wire rod and processing teeth 23 b refracting a plate member into a V shape are projected on the outer periphery of the processing rotating body 22 for scouring. Grain recovery efficiency can be further increased by making these treated teeth 23a and 23b enter the waste straw and loosen them.

Longitudinal side view of threshing device Cross-sectional plan view of threshing equipment Longitudinal rear view of threshing device Longitudinal front view showing the main parts of the screw transport structure Cross-sectional view and (b) side view of (b) shaft end of the transverse feed screw (B) Longitudinal side view and (b) Front view of bevel gear Front view of gear case and bevel gear built in it Front view of screw shaft of another embodiment and bevel gear connected thereto Front view showing a processing rotor of another embodiment Further, a perspective view showing a processing rotator according to another embodiment.

Explanation of symbols

25 Screw shaft 25a Gear connecting portion 34 Screw shaft 34a Gear connecting portion 35 Bevel gear 35a Center fitting hole 36 Bevel gear 36a Center fitting hole S1 Flat cut surface S2 Flat cut surface S3 Flat cut surface S4 Flat cut surface S5 Flat cut surface

Claims (3)

A screw conveying structure in which the rear end of the screw shaft on the upper conveyance side and the start end of the screw shaft on the lower conveyance side are linked and connected via a bevel gear,
The cross-sectional shape of the gear coupling portion of each screw shaft and the center fitting hole of the bevel gear fitted and connected thereto is set to a shape that allows mutual fitting only in one specified rotational phase. Screw transport structure characterized by   A pair of flat cut surfaces facing each other in parallel with each other are provided on the outer peripheral surface of the gear coupling portion of the screw shaft, and one of the shaft outer peripheral surfaces facing each other between the flat cut surfaces is provided with a flat cut surface. Item 2. A screw conveying structure according to Item 1.   The screw conveyance structure according to claim 1, wherein a pair of flat cut surfaces facing each other in a non-parallel state are provided on an outer peripheral surface of the gear coupling portion of the screw shaft.

Images