JPS6349342Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Industrial Field of Application] The present invention relates to a grain-frying spiral body that lifts and transports grains in a grain sorter that sorts out and removes immature grains, broken grains, etc. while frying grains such as rice. [Prior art] Regarding this type of grain sorting machine,
Publication No. 14269, Japanese Patent Publication No. 57-177381, Japanese Patent Publication No. 1983-177381
It has already been disclosed in JP-A-58-146475, JP-A-58-153562, JP-A-58-156377, and the like. These grain sorters, as shown in Figure 6,
A cylindrical sorting net 2 and a grain frying spiral 3 fitted inside the sorting net 2 are erected in an outer shell 4 concentrically and rotatably with each other.
The fried grains fall onto the upper partition plate 15 from the discharge port 23a formed in the upper part of the sorting net 2, and the grains on the partition plate 15 are fixed to the sorting net 2 and are scraped. The blades 16 transport the liquid to an outlet 45 formed in a part of the upper outer periphery of the outer shell 4, and guide it into the hopper 8 from the outlet 45. As shown in FIG. 7, the sorting net body 2 used in these grain sorting machines has a cylindrical shape composed of a lower tube 21, an intermediate screen tube 22, and an upper tube 23. A large number of meshes 22a are perforated in the entire area of the cylinder 22 in an orderly manner in the direction of rotation. The sorting net 2 is connected to the drive shaft 6 at a joint portion 20. The drive shaft 6 extends inside the grain lifting helix 3, has a lower end 6a connected to a motor M via a gearbox G, and has an upper end 6b pivotally supported by the top plate 7. Further, as shown in FIG. 7, the lower tube 21 of the sorting net body 2 is rotatably supported by a guide roller 10 disposed on the upper end surface 51 of the particle receiving tube 5. As shown in FIG. The grain lifting spiral body 3 is provided with a spiral blade 32 on the outer periphery of a spiral shaft 31. Select area 34
In addition, the area facing the upper cylinder 23 is the extraction area 35.
Furthermore, the lowermost end of the supply area 33 is used as a scraping area 36, which is divided into action areas. The bottom plate 30 of the grain lifting spiral body 3 is connected to a rotary disk 11 connected to a motor M via a gear box G.
The rotation of the rotary disk 11 causes the grain frying spiral body 3 to rotate around the drive shaft 6. The grains, such as rice, which have been sorted by the grain sorter and stored in the hopper 8, are weighed in a predetermined amount and packed into bags. Incidentally, recently, this bagging work has been automated and carried out with high efficiency. Therefore, a situation may arise in which the amount of grain supplied to the grain sorting machine tends to be insufficient. It is also required to sort grains as accurately as possible. Therefore, it is desired to improve the grain supply capacity of grain sorting machines and improve the sorting accuracy. The grain supplying capacity of this grain sorting machine is the amount of grain lifted per unit time of the grain lifting spiral 3 (hereinafter referred to as grain lifting capacity).
Determined by In order to improve grain lifting performance, the pitch of the helical blades may be reduced and the radial width of the helical blades, that is, the difference in radius between the outer periphery of the helical blades and the outer periphery of the helical shaft may be increased. On the other hand, in order to improve sorting accuracy, it is desirable to increase the pitch of the spiral blades, increase the radial width of the spiral blades, and reduce the amount of grains to be lifted. Therefore, for example,
If a grain frying spiral body in which the pitch of the spiral blades is reduced and the width of the spiral blades is increased in the radial direction is used, the sorting accuracy will be reduced, resulting in a problem that crushed grains etc. cannot be sufficiently removed. In addition, in order to improve the sorting accuracy, there is one in which the surface of the spiral blade is inclined downward from the center of the spiral shaft toward the outside. (Refer to Japanese Patent Application Laid-open No. 58-27677). In this device, the grains filled between the spiral blades are collected on the outside of the spiral blades by applying the resultant force of gravity and centrifugal force. However, in this conventional method, the space formed between the outer periphery of the spiral blade and the mesh tube has an acute angular cross section, so the grains that have gathered on the outside concentrate in this area.
The inclined surface of the spiral blade acts like a funnel, and these grains often fall downward through the gap between the outer periphery of the spiral blade and the mesh tube. Therefore, there is a drawback that the grain frying ability is reduced. In this way, in the conventional grain frying spiral, by appropriately setting the pitch and radial width of the spiral blades,
Furthermore, attempts have been made to improve grain lifting performance and sorting accuracy by changing the mounting angle of the spiral blades, resulting in a paradox in which improving one will result in a decrease in the other. Therefore, conventionally, it has been difficult to improve both grain frying performance and sorting accuracy. [Purpose of the invention] The present invention has been developed by focusing on these problems, and it is possible to improve both grain frying performance and sorting accuracy without the need for improvement in one to deteriorate the other. , an object of the present invention is to provide a grain lifting spiral for a grain sorting machine. [Structure of the invention] The present inventor has experimentally found that the grain lifting ability of a grain lifting spiral is mainly determined by the grain lifting ability in the raking region of the spiral. It has also been found that the sorting accuracy can be improved by setting the radial width and pitch of the main helical blade to predetermined ratios, and the diameter of the helical shaft and the outer diameter of the main helical blade, respectively. The present invention was made based on this knowledge and is constructed as follows. That is, the present invention has a main helical blade on the outer periphery of a helical shaft, which is fitted concentrically and rotatably inside a cylindrical sorting net to constitute the main part of a grain sorting machine. In a grain lifting spiral body that uses a main spiral blade to transport grain upward from a raking area at the lowest end to a sorting area and a take-out area by rotation of the shaft, the starting end of the main spiral blade is placed in the raking area at the lowest end. An auxiliary spiral blade having a starting point at a different angular position from the main spiral blade is provided, and the auxiliary spiral blade has its terminal end beyond the angular position of the starting end of the main spiral blade, and has a locally double helical structure, and The main helical blade has a radial width of 1, a pitch of approximately 1.3, a diameter of the helical axis of 1, and an outer diameter of approximately 1.4; It is characterized in that each part of the surface in the width direction is attached to the helical shaft so as to be located on the normal line of the corresponding cut surface of the helical shaft. [Operation of the device] As in the above configuration, by providing an auxiliary spiral blade in the raking area at the lowest end and creating a locally double spiral structure, the raking area for grains is doubled. In addition, the pitch of the spiral blades in this part is approximately 1/2 of that of the main spiral blades alone, allowing grains to be scraped up efficiently. Further, the auxiliary spiral blade has its terminal end located beyond the angular position of the starting end of the main spiral blade. Therefore, the grains raked up by the auxiliary spiral blade fall at the end of the auxiliary spiral blade, but always fall onto the main spiral blade and are reliably conveyed. Further, since the main spiral blades have a radial width of 1 and a pitch of approximately 1.3, the space between the spiral blades, that is, the valley portion has a wide opening and a shallow depth. Moreover, the diameter of the helical axis is 1
Since the outer diameter is set to approximately 1.4, a large amount of fried grains are located near the outside of the grain-floating spiral. Therefore, as the helical shaft rotates, a large centrifugal force is applied to the grains between the helical blades, and the grains come into strong contact with the mesh tube, thereby ensuring reliable sorting. In addition, since the depth between the spiral blades is shallow, the inner and outer grains are sufficiently agitated. Therefore, even though a large amount of grain is fried, there are almost no grains left unsorted, and the sorting accuracy is improved. Moreover, since each part of the main helical blade in the width direction of the surface is attached to the helical shaft so as to be located on the normal line of the corresponding cut plane of the helical shaft, the outer periphery of the main helical blade and the mesh tube are perpendicular. Therefore, grains do not concentrate in these gaps. Therefore, grains do not fall from the gap between the outer periphery of the main spiral blade and the mesh tube, so grain lifting performance is not reduced. [Example] Hereinafter, an example of the present invention will be described based on the drawings. Note that the same parts as in the conventional example are given the same reference numerals. <Configuration of Example> The grain frying spiral body of the present invention shown in FIGS. 1 to 5 is constructed by providing a main spiral blade 32a and an auxiliary spiral blade 32b on the outer periphery of a cylindrical spiral shaft 31. The main spiral blade 32a is formed in the same manner as the spiral blade of the conventional grain frying spiral body, and extends from the upper part of the spiral shaft 31 to the take-out area 35, the sorting area 34, the supply area 33, and the raking area 36. It is continuously provided by one spiral blade. As shown in FIGS. 1 and 3, the main spiral blade 32a has a width S in the radial direction of 1 and a pitch P of approximately 1.
1.3, the diameter d of the helical shaft 31 is set to 1, and the outer diameter D is set to a ratio of approximately 1.4. In the case of this embodiment, the diameter d of the helical shaft 31 is 190 mm,
The outer diameter D of the main spiral blade 32a is 265 mm, and the radial width S of the main spiral blade 32a is 37.5 mm. Further, the pitch P of the main spiral blade 32a is set to 50 mm. In the case of this embodiment, the auxiliary spiral blade 32b is provided for approximately half a turn in the raking area 36. As a result, the helical blade has a double helical structure in this part, and the helical pitch is the same as the pitch P of the main helical blade 32a.
It becomes 1/2 of that. On the other hand, since there are two starting ends of the spiral blade, grains are raked up at two locations. The angular position of the starting end of the auxiliary spiral blade 32b is set so that the phase is shifted by 180 degrees with respect to the starting end of the main spiral blade 32a, as shown expanded in FIG. That is, the starting end of the main spiral blade 32a
When the position is 180 degrees, the starting end of the auxiliary spiral blade 32b is set to be at the 0 degree position. Further, the terminal end 38 of the auxiliary spiral blade 32b is set to exceed the angular position of the starting end of the main spiral blade 32a. That is, when the starting end of the main spiral blade 32a is at a position of 180 degrees as described above, the terminal end of the auxiliary spiral blade 32b is set to be beyond this angular position, for example, at a position of 190 to 200 degrees. Ru. The main helical blade 32a and the auxiliary helical blade 32b have the same outer circumferential diameter and are both attached to the helical shaft 31 at the same attachment angle. This mounting angle is
In the case of the present invention, it is set to 0 degrees. That is, the main helical blade 32a is attached to the helical shaft 31 such that each part of its surface in the width direction is located on the normal line of the corresponding cut surface of the helical shaft 31 with which it is in contact. Near the starting end of the main spiral blade 32a and the auxiliary spiral blade 3
2b has a small lead. This is to make the slope gentler and make it easier to rake up grains. In addition, the main spiral blade 32a and the auxiliary spiral blade 32b
Scraping claws 37a and 37b are provided at the starting end of each. <Operation of the embodiment> Next, the operation of the embodiment described above will be explained with reference to the above figures. The grain lifting spiral body of the above embodiment can be applied to the grain sorting machine shown in FIG. Here, in order to fry grains using the grain frying spiral of the above embodiment attached to the grain sorter shown in FIG. On the other hand, the motor M is rotated to rotate the drive shaft 6 and the rotary disk 11 via the gearbox G. The rotation of the rotary disk 11 causes the grain lifting spiral body 3 to rotate around the drive shaft 6, and the rotation of the drive shaft 6 also causes the sorting net body 2 to rotate.
rotates. Due to the rotation of the grain lifting spiral body 3, in the raising area 36,
Grain fed into the grain receiving tube 5 is scraped up by the scraping claw 37a of the main spiral blade 32a and the scraping claw 37b of the auxiliary spiral blade 32b. In this case, since the main spiral blade 32a and the auxiliary spiral blade 32b scrape up the grains, twice the amount of grains as usual will be scraped up. In addition, since the spiral pitch in this part is 1/2 of the normal pitch, the raked grains are packed relatively densely between the spiral blades, and the frictional force between the grains increases. Since it resists the centrifugal force caused by the rotation of the helical shaft 31, it is less likely to fall. Therefore,
Since twice the normal amount of grain can be raked up and a decrease in the amount of grains to be lifted due to the raked grain falling can be prevented, a large amount of grain can be delivered to the supply area 33. At the terminal end 38 of the auxiliary spiral blade 32b, the terminal end 38 is provided beyond the angular position of the starting end of the main spiral blade 32a, so the grains raked up by the auxiliary spiral blade 32b are 38, but it always falls onto the main spiral blade 32a and is reliably conveyed. The supply area 33 further transports the raked grains upward and sends them to the sorting area 34. In the sorting area 34, the grains hit the mesh tube 22 due to the action of centrifugal force, and fine grains smaller than the mesh 22a are
It is sieved to the outside of the screen tube 22 and falls onto the horizontal partition plate 12, transferred to the discharge port 42 by the scraper blades 13, and discharged to the outside. On the other hand, grains larger than the mesh 22a of the mesh tube 22 are lifted up in the sorting area 34 and fed and conveyed to the take-out area 35. In this region, the main spiral blade 32a has a radial width S of 1 and a pitch P of approximately 1.3, so that the space between the spiral blades 32a, that is, the valley portion, has a wide opening. The structure has a shallow depth. Moreover, since the diameter d of the helical shaft 31 is set to 1 and the outer diameter D is set to approximately 1.4, a large amount of fried grains are located near the outside of the grain-floating spiral body 3. Therefore, as the helical shaft 31 rotates, a large centrifugal force is applied to the grains located between the helical blades 32a, and the grains come into strong contact with the mesh tube 22, so that the grains are reliably sorted. Moreover, since the depth between the main spiral blades 32a, 32a is shallow, the inner and outer grains are sufficiently agitated.
Therefore, all the grains are always sorted by coming into contact with the mesh cylinder, and even though a large amount of grain is fried, there are almost no grains left unsorted, improving the sorting accuracy. Furthermore, since the main spiral blade 32a and the mesh tube 22 are vertical, grains do not concentrate in the gaps between them, and therefore grains do not fall from the gaps and reduce grain lifting performance. do not have. The grains fried to the top of the take-out area 35 are discharged from the discharge port 23a into the storage section of the hopper 8,
stored. As mentioned above, the grain frying spiral body of the present invention has high grain frying ability. When the grain lifting spiral of the present invention and the conventional grain lifting spiral were respectively installed in a grain sorting machine of exactly the same type except for the grain lifting spiral, the amount of grains lifted was compared. A grain sorting machine equipped with a grain spiral can lift 1.3 to 1.5 times more grain than a conventional grain sorting machine equipped with a grain spiral, and has improved sorting accuracy by several percent. Therefore, a specific experimental example will be shown below. [Experimental Example] The experimental conditions are shown in the following table. However, conventional products: conventional sorting machines that use a grain-flipping spiral Invented products: sorting machines that use the present invention's grain-flipping spirals

【table】

[Table] The results of the experiment repeated several times under the above conditions are shown below. Amount of grain fried...Conventional product 1896-1950Kg/H Invented product 2394-2814Kg/H Sorting accuracy...1st port (good rice exit) waste rice rate Conventional product average 4.2% Invented product average 3.0% 2nd port (scrap rice exit) ) Good rice rate Conventional product average 95.8% Invented product average 97.0% As is clear from the above experimental results, by using the grain frying spiral of the present invention, it is possible to improve the sorting accuracy and increase the amount of grains to be fried. [Effects of the invention] As explained above, the present invention provides the most efficient grain lifting spiral structure in which grains are conveyed upward from the raking area at the lowest end to the take-out area via the sorting area using the spiral blades by the rotation of the helical shaft. An auxiliary spiral blade having a starting point at a different angular position from the starting end of the spiral blade is provided in the rake-up area at the lower end, and the auxiliary spiral blade has its terminal end beyond the angular position of the starting end of the spiral blade, It has a locally double helical structure, and the main helical blade has a radial width of 1 and a pitch of approximately 1.
1.3, the diameter of the helical shaft is set to 1, and the outer diameter is set to approximately 1.4, and furthermore, each part of the main helical blade in the width direction of its surface is set to the corresponding cut surface of the helical shaft. By attaching it to the helical shaft so as to be located on the normal line, it is possible to improve sorting accuracy and grain lifting performance.

[Brief explanation of the drawing]

Figures 1 to 5 show an embodiment of the grain-frying spiral of the present invention, with Figure 1 being a front view, Figure 2 being a rear view, Figure 3 being a plan view, and Figure 4 being a top view. Its bottom view, FIG. 5 is a developed view showing the raking area of the grain lifting spiral of the above embodiment, FIG. 6 is a sectional view showing a grain sorting machine equipped with a conventional grain lifting spiral, and FIG. FIG. 2 is a perspective view showing a sorting net used in the sorting machine. 2... Sorting net body, 3... Grain frying spiral body, 31...
Spiral shaft, 32a... Main spiral blade, 32b... Auxiliary spiral blade, 33... Supply area, 34... Sorting area, 3
5... Removal area, 36... Scraping area, 37a, 37b
... Scraping claw, 38 ... Termination, 4 ... Outer shell body.

Claims (1)

[Claims for Utility Model Registration] A grain sorting machine comprising a main helical blade on the outer periphery of a helical shaft, which is fitted concentrically and rotatably inside a cylindrical sorting net, and constitutes the main part of a grain sorting machine. , in a grain lifting spiral body in which grain is conveyed upward from a raking area at the lowest end to a sorting area to a take-out area by a main helical blade by rotation of a helical shaft, the main helical blade is connected to the raking area at the lowest end; An auxiliary spiral blade is provided whose starting end is at a different angular position from the starting end of the main spiral blade, and the auxiliary spiral blade has its terminal end beyond the angular position of the starting end of the main spiral blade, forming a locally double helical structure. , and the main spiral blade has a radial width of 1
The pitch is set to approximately 1.3, the diameter of the helical shaft is set to 1, and the outer diameter is set to approximately 1.4.Furthermore, each part of the main helical blade in the width direction of its surface is A grain lifting spiral body for a grain sorting machine, characterized in that the grain lifting spiral body is attached to the spiral shaft so as to be located on the normal line of a corresponding cutting surface.