JPH0123582Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is based on a sorting drum used in an automatic fruit sorting machine that sorts roughly spherical fruits such as mandarin oranges into small and large fruits. It's about shape.

Usually, as a means for sorting fruits such as mandarin oranges into large and small fruits, a large number of sorting holes 2 are bored in the circumferential surface of a drum 1, as shown in FIGS. The fruits with the smaller diameter holes are supported sideways by the roller 4 in parallel in order from the ones with the smallest diameter holes, and the fruits are fed to the drum surface on the side with the smaller diameter holes by the rotation of the drum, and the bottom part is dropped into the sorting holes. When the bottom circumference is received by the hole edge and the drum is rotated backward one after another, it is passed through the individual sorting holes and dropped into the drum one after another, starting with the smallest one. The water can be taken out to the side by means of a gutter 5 installed obliquely.

By the way, the sorting hole 2 in the conventional drum 1
is the screening hole 2, as shown in the side cross-sectional view in FIG.
In order to prevent the fruit from being damaged by the corner at the top of the hole edge, the corner is chamfered 2'. Conventionally, this chamfer 2' has a uniform area (depth) around the entire circumference. Therefore, regardless of the fruits that pass through the sorting hole and fall into the drum 1, fruits F with a larger diameter fall above the sorting hole 2 of the drum 1, which rotates in the clockwise direction of the arrow. When the fruits land on the drum, they must be transferred forward in the rotational direction one after another as shown by the chain lines, but in reality, the chamfer 2' of the edge of the sorting hole is uniform all the way around, and the bottom of the fruit is not close to the top of the drum. By being able to attach to some chamfered parts that occupy high positions,
As the fall becomes shallow, the bottom of the fruit sits insufficiently and becomes unstable, and there is a high probability that the fruit will fall backwards in the rotational direction of the drum 1 immediately before being transferred, without passing the top of the drum as shown in the figure. increase,
Repeated collisions with fruits that are supplied one after another from behind worsen the conveyance and reduce sorting efficiency.

Therefore, as a countermeasure to this problem, if the number of screening holes formed in the drum is increased, the distance between adjacent holes becomes narrower, which reduces the area of the outer surface of the drum and reduces the overall strength of the drum. In addition, in order to reduce the possibility of the drums falling off during the transfer process, the drums are made into octagonal or other polygonal cross-sections and sorting holes are provided on each flat surface. A guide plate 6 is installed to guide the fruits onto the next drum. Therefore, if the drum is made into a polygon, the guide plate 6 must be positioned outside the rotation locus of the ridge of the drum. , the vertical difference between the edge of the guide plate and the flat surface provided with the sorting holes becomes large, which causes stumbling when being fed from the drum surface onto the next guide plate 6. As a result, the transfer efficiency deteriorates.

The purpose of the present invention is to eliminate these conventional drawbacks, and its technical means is to cut a chamfer formed on the outer upper periphery of the sorting hole bored in the drum in the circumferential direction of the drum. The fruit is formed in a continuous shape so that the area in the axial direction is gradually wider than the hole, and when using the technical means of the present invention, the introduction of fruit into the sorting hole or the placement of the fruit on top of the sorting hole is facilitated. Furthermore, by making the depth of the fruit that has landed on the sorting hole into the hole greater than that of the conventional example, it is possible to stably place the fruit, and to reduce the possibility of the fruit falling down as much as possible, making it easier to transfer the fruit. Efficiency is significantly improved.

Next, the technical means according to the present invention will be explained in more detail with reference to FIG. 3, which is shown in comparison with the conventional example shown in FIG. 5. The diameters and plate thicknesses of the drums 11 and 1 shown in FIGS. 3 and 5 are all the same, and the diameters D and D' of the screening holes 12 and 2 are circular with the same diameter. are formed with the same pitch intervals P and P'.

First, in the conventional example shown in FIG. 5, the chamfer 2' on the upper peripheral edge of the sorting hole 2 is formed to have a uniform depth all around the hole, so that the fruit F on the sorting hole is The top surface of the cylindrical body at 2', that is, both parts in the drum axial direction occupying the highest positions with respect to the horizontal line at the center of the drum (located at two locations on the axial direction line of the drum 1 passing through the center of the sorting hole 2) A As a result, the insertion depth S' of the fruit into the sorting hole becomes shallow and the fruit is likely to fall from the top of the sorting hole 2.
According to the present invention, as is clear from Fig. 3,
The area of the chamfer 12' of the sorting hole 12 gradually increases from the circumferential direction to the axial direction of the drum 11, so that the position of the receiving part of the fruit F by the sorting hole is lower than the upper part of the fruit. As a result, the immersion depth S increases, and the possibility of falling from the top of the sorting hole as in the conventional example described above is reduced.

As described above, according to the present invention, it is possible to facilitate the introduction of fruits into the sorting holes in the drum, and the receiving or landing is carried out stably and well, and furthermore, the falling to the rear of the rotation that occurs during transfer is prevented. This has the effect of significantly increasing the transfer efficiency of the drum by reducing the amount as much as possible.

Embodiments of the present invention will be described below with reference to FIGS.
The drum is horizontally supported by upper and lower driving rollers 4, 4, which are mounted on a frame 3, in parallel in order from the smallest sorting hole 12, and the large and small ones supplied from one end. drum of fruits 11
The fruits are introduced into each sorting hole 12 by the rotation of the drum 12, and the fruits are sequentially transferred while passing over the sorting holes 12, and the fruits that have passed through each sorting hole 12 and are dropped into the drum 11 are sent out to the side by the gutter 5 in each drum. It is being done. 6 indicates a guide plate that guides the fruit toward the outer surface of the adjacent drum 11. Each of the sorting holes 12 is circular, and a drum 1 is attached to the periphery of the upper part which becomes the entrance of the sorting hole.
A chamfer 12' whose area is gradually wider in the axial direction than in the circumferential direction is continuously formed over the entire circumference of the screening hole. Note that the chamfer 12' is not formed when the drum 11 is unfolded into a flat plate shape, but after drilling circular holes at desired positions on the circumferential surface of the cylindrical drum. As shown in FIG. 6, when a truncated cone-shaped polishing tool G is applied from a right angle to the periphery of the hole to chamfer to an appropriate depth, a chamfering operation of an appropriate depth is applied to the periphery of the hole in the drum axis direction passing through the center of the hole. Since the hole edge portion A on the side corresponding to both ends of is in contact with the large diameter portion of the tool G, the area is wider than the hole edge portion B on the side in the drum circumferential direction perpendicular to the axial direction line. Since it will be shaved off in a dish-like shape, as is clear from FIG. The grinding area of A' becomes large, and a screening hole 12 having the above-mentioned required chamfer 12', which forms an elliptical shape with the longer axis along the axial side, is obtained.

When using the sorting hole 12 having the above-mentioned shape, when the drum 11 rotates and the fruits F ride on the sorting hole 12 as described above, the chamfered portion A' on the axial side of the drum in the sorting hole becomes Since a wider area is scraped off in the same circumferential direction, the bottom of the fruit will be deeply immersed in the sorting hole,
Therefore, as the drum rotates, the fruits that are sequentially transferred from a low level to an upper position on the sorting holes are stably transferred to the next drum position without falling down on the way.

[Brief explanation of the drawing]

Fig. 1 is a side view showing an example of an automatic fruit sorting machine using the sorting drum of the present invention, Fig. 2 is a partially cutaway side view of the drum, Fig. 3 is an enlarged side sectional view of the same main part, 4 is a front view of a conventional drum, FIG. 5 is a partially enlarged side sectional view of FIG.
The figure is a partial plan view of the drum. 11 is a drum, 12 is a sorting hole, and 12' is a chamfer.

Claims (1)

[Scope of utility model registration request] In an automatic fruit sorting machine that sorts fruit by size by horizontally rotating a drum with a large number of circular sorting holes drilled at appropriate intervals on its circumference, the outside of the sorting holes drilled in the drum. 1. A sorting drum for an automatic fruit sorting machine, characterized in that the chamfer formed on the upper periphery of the drum is formed in a continuous manner so that the area is gradually wider in the axial direction than in the circumferential direction of the drum.