JPS6349345Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to an improvement of the hopper structure in a rotary type plastic pellet sorter.

<Prior art> This type of rotary type plastic pellet sorting machine is used, for example, to crush plastic molded products using a crusher and melt the crushed granular pellets to obtain recycled molded products. used.

In other words, the pulverizing action of the pulverizer is carried out very randomly, so when reusing plastic pellets from now on, if there are too many non-standard products mixed in, this can cause melting failure during molding. Also, if there is a large amount of dust, it will cause unsightly black spots on the molded product and deteriorate its quality.
In the process of automatic mechanical rotation conveyance, dust is removed from the product, and standard products with a certain particle size (3 mm x 3 mm x 3 mm dice or 3
It is necessary to select the cylindrical state (mm〓×3 mm).

However, mainly due to work efficiency, plastic pellets weighing an average of 25 kg per bag are fed into the hopper at the same time, and when the hopper is almost full, the conventional hopper
As shown in the figure, since the entire structure is just a square simple funnel shape when viewed from above, there are the following problems.

<Problems to be solved by the invention> That is, the conventional hopper structure has a large hopper body 1a on the upper side and a small base cylinder 1 on the lower side.
The hopper main body 1a is connected to the base cylinder 1 by inclined walls 2, 3, 4, 5, which face each other from the front and rear directions and the left and right directions.
Since the pellets are surrounded by a pyramidal shape that concentrates on the opening S, when a large number of pellets are simultaneously thrown in from above as described above, the pellets in the center that are falling vertically as shown by the arrow Y in Fig. 12 are , the pellets that try to flow down diagonally from the surrounding area as indicated by the separate arrows X will be pinched and formed into lumps, resulting in a clogging state (bridging phenomenon) in which the falling pressure is balanced overall. I end up doing it. As a result, the pellets cannot be automatically conveyed in permissible quantities, and this poses a problem in the dust removal function and the standard product sorting function.

Further, since the hopper main body 1a and the base cylindrical body 1b are formed continuously and integrally, it is difficult to stretch them for packaging and transportation, and it is also difficult to apply abrasion-resistant treatment to the inner surface. Recently, the use of composite resins (engineering plastics) reinforced with fine metal powder and various fibers has been increasing, and since these molded products are extremely hard, wear-resistant treatment is required for the hopper that receives the pellets. This is essential for improving durability.
Such processing also cannot be performed completely and efficiently.

<Means for Solving the Problems> The present invention aims to solve these problems, and for this purpose, it consists of a large upper hopper body that is shaped like a square funnel, and a small square that fits and communicates with the bottom opening of the hopper body. A hopper having a cylindrical shape and consisting of a lower base cylinder which discharges pellets forward with its forward-sloping bottom surface, and a hopper which is in communication with the forward discharge port of the base cylinder and which is arranged around the horizontal axis. It is equipped with a pellet transport cylinder that is rotationally driven, and the hopper is installed in a fixed state.
In a rotary type plastic pellet sorter that pulls out and transports pellets fed into the hopper forward by rotating a pellet transport cylinder, only the front wall of the hopper body is defined as a vertical surface, and the hopper body and base cylinder are separated. When placing the gate plate, which is a rectangular flat plate that should partition the bottom opening, at the boundary with the body, the gate plate should be placed in a side view with the upper end keeping a narrow and constant clearance from the vertical front wall. It is fixedly installed in a backward tilted state, and the length is determined to reach the position where the lower end intersects the virtual extension line of the front downward tilted rear wall that forms the hopper body, and a symmetrical notch is placed at the corner position of the lower end. This feature is characterized in that by applying this, the balance of the falling pressure on the pellets accommodated in the hopper is automatically disturbed.

<Example> Hereinafter, the specific configuration of the present invention will be described in detail based on the illustrated example. In Figures 2 and 3 showing the rotary type plastic pellet sorting machine, 8 is attached to the fixed state. This is a hopper, into which pellets of plastic molded products randomly crushed by a crusher are fed into the hopper either by automatic feeding means such as air conveyance (not shown) or manually. It turns out.
Reference numeral 9 denotes a pellet conveying cylinder which is opened in communication with a position adjacent to the front of the hopper 8, and is driven to rotate around a horizontal axis as will be described later. It is transported to the next dust removal cylinder 10.

The dust removal cylinder 10 has a pair of front and rear wall plates 11 and 12.
and a plurality of parallel connecting rods 1 that connect them to each other.
3, and a mesh-shaped screen 14 which is wound around and stretched between both wall plates 11 and 12 in a cylindrical shape so as to surround the connecting rod 13 from the outside, and then the side wall plates 11 is fitted and fixed to the outlet port 15 of the pellet conveying cylinder 9 so that they can rotate together. Also, each connecting rod 1
A plurality of hammers 16 for hitting the screen 14 are suspended from the connecting rod 13 so as to make a pendulum movement using the connecting rod 13 itself as a pivot axis.

Then, when the dust removal cylinder 10 rotates integrally with the pellet transport cylinder 9, the hammer 16 revolves and rotates on its axis, thereby striking the screen 14 from the inside. Therefore, clogging of the screen 14 is prevented, and pellets themselves and the screen 1
The dust adhering to the container 4 and the undersized pellets are automatically and reliably discharged from the mesh to the container 18 through the guide tube 17.

Reference numeral 20 denotes a pellet sorting cylinder which is connected and fixed to the front wall plate 12 of the dust removal cylinder 10 so as to be able to rotate integrally with each other. A large number of screening holes 21 are opened through which standard pellets pass. 22 is a flange projecting from the rear end of the pellet sorting cylinder 20, and 23 is a bolt for fixing the flange 22 to the front wall plate 12.

The pellet sorting tube 20 also rotates around the horizontal axis, and while the pellets conveyed from the dust removal tube 10 are conveyed forward by the difference in rotational circumferential speed of its lapper-shaped body surface, the standard products are separated. Sorting hole 21
The remaining non-standard oversized pellets are discharged from the front of the pellet sorting cylinder 20 via a chute 26 to another conveyor 27.

As shown in FIGS. 1, 4, 7, and 10, the hopper 8 has a small base cylinder 30 on the lower side that communicates with the rear opening of the pellet conveying cylinder 9 in the case of the present invention, and a joint flange to the base cylinder 30. It consists of a large upper hopper main body 33 which is detachably fixed via 31 and 32, and has a rectangular cylindrical shape as a whole when viewed from above. Reference numeral 34 denotes a front downwardly inclined rear wall of the hopper main body 33 located on the rear side in relation to the conveying direction of the pellets, 35, 36
37 is a vertical front wall of the hopper body 33, and each wall surface is smooth and flat. In other words,
The hopper main body 33 has a pyramidal funnel shape as a whole, but only its front wall 37 is set as a vertical surface. It should be noted that the bottom wall of the base cylinder 30 is also formed into a downwardly sloped surface, so that the pellets can be sent forward and fall toward the pellet transport cylinder 9, as shown in Figures 1 to 3. As suggested.

Reference numeral 38 denotes a gate plate facing the boundary between the upper hopper body 33 and the lower base cylindrical body 30, and is basically a rectangular flat plate that partitions the bottom opening S of the hopper body 33. It is fixedly installed as follows.

That is, when viewed from the left and right directions as shown in FIGS. 1 and 10, the gate plate 38 is inclined backwardly downward, intersecting with the vertical front wall 37 and the inclined rear wall 34 of the hopper main body 33. The upper end of the rear wall 3 is connected to the vertical front wall 37.
They are arranged in such a manner that a certain clearance 1 is maintained which is considerably narrower than the mutual clearance with 4. Furthermore, the length d of the lower end of the gate plate 38 until it reaches the point where it intersects with the forward imaginary extension line PP of the inclined bottom wall 34 is defined as the length d of the base cylindrical body 30.
It has been extended to go inside.

Furthermore, a pair of symmetrical notches 39 are machined at the lower corner positions of the square gate plate 38 to form a so-called triangular cut-off state.
Therefore, some pellets do not slide downward from the gate plate 38, but instead fall directly downward from the notch 39. In this sense, the cutout shape of the cutout 39 is not limited to a triangle, but may also be cut out in the shape of a symmetrical concave arc, for example.

The gate plate 38 as described above has its upper end edge welded in advance to the lower ends of the left and right side walls 35, 36 of the hopper body 33, which is separate from the base cylinder 30. be. Therefore, when the hopper main body 33 and the base cylinder 30 are disassembled, the gate plate 3 is placed on the hopper main body 33 side.
8 will be included.

The above-mentioned pellet conveying cylinder 9 is rotatably supported via a bearing 42, and a sprocket wheel 43 is integrally and fixedly protruded from the body surface thereof. 44 is the sprocket wheel 43
A transmission chain 45 is a rotational drive source such as a motor, and 46 is an output wheel thereof. At the same time, the dust removal cylinder 10 and the pellet sorting cylinder 20 also rotate.

Reference numeral 47 denotes a conveying screw integrally projecting from the inner circumferential surface of the pellet conveying tube 9, which automatically conveys the pellets from the hopper 8 forward toward the dust removal tube 10. ing. Reference numeral 50 denotes a closing plate that is press-fitted into the outlet 15 of the pellet conveying cylinder 9 in order to partially block the outlet 15, and has a conical protrusion projecting from the central position as shown in FIGS. 8 and 9. 51, and a notch 52 for feeding pellets is also provided at the circumferential position thereof. Moreover, the notch 5
2 is the delivery side end 47a of the conveyance screw 47
Therefore, only the fixed amount of pellets allowed by the notch 52 is sent from the pellet conveying cylinder 9 to the dust removal cylinder 10, which improves the subsequent sorting action by the pellet sorting cylinder 20. can be done.

<Function> According to the above structure, the inside of the hopper 8 is partitioned off by the gate plate 38, and the delivery side end 47a of the transport screw 47 is connected to the delivery port 15 of the pellet transport cylinder 9. Since the closing plate 50 provided with the corresponding notch 52 is fixed to be rotatable integrally with the pellet conveying cylinder 9,
Even if a large amount of plastic pellets are fed from the hopper 8 at the same time, the permissible amount of plastic pellets is pulled out forward from the hopper 8 due to the above-mentioned rotational action, and transferred from the pellet conveying cylinder 9 to the dust removal cylinder 10. and pellet sorting cylinder 20
As the pellets are conveyed to the machine, the desired standard pellets can be automatically and smoothly selected.

In this case, the gate plate 38 in the hopper 8 is fixedly installed in a downwardly inclined state with a small clearance l between its upper end and the vertical front wall 37 of the hopper body 33. Small clearance l
Since the hopper 8 is opened in such a manner that it approaches the forward discharge opening of the base cylinder 30, a certain amount of the pellets stored in the hopper 8 in a so-to-speak full state will first reach the point indicated by the arrow A in FIG. As shown, it is sent out straight downward through the small gap l.

Further, since a symmetrical notch 39 is provided at the lower end corner position of the gate plate 38, a certain amount of pellets remaining in the hopper 8 is also passed through the openings of both notches 39 as shown by arrow B. It will fall straight down. and,
A certain amount of pellets still remaining in the hopper 8 will eventually slide down along the flat surface of the gate plate 38 in the direction of arrow C.

In other words, the gate plate 38 has a partitioning function within the hopper 8, and is useful for automatically adjusting the falling flow rate of the pellets. This works to prevent the bridging phenomenon within the hopper 8 by intentionally disrupting the balance of the falling pressure on the pellets based on their posture and changing the order in which they fall. The length d of the gate plate 38
The above arrow C also indicates that the hopper main body 33 is regulated to be constant from the relationship with the front downwardly inclined rear wall 34.
The pellet slides down in the direction of .

<Effects of the invention> As described above, the present invention has a large upper hopper body 33 in the shape of a square funnel, and a small square cylinder shape that coincides with and communicates with the bottom opening S, and the bottom surface of the hopper slants downward toward the front. hopper 8 consisting of a lower base cylinder 30 that discharges the
and a pellet conveying cylinder 9 which faces the forward discharge port of the base cylinder 30 and is driven to rotate around a horizontal axis, and the pellets are transferred to the hopper 8 which is installed in a fixed state. By rotating the conveyor cylinder 9,
In a rotary type plastic pellet sorting machine that pulls out and conveys pellets fed into the hopper 8 forward, only the front wall 37 of the hopper body 33 is defined as a vertical surface, and the hopper body 33 and the base cylinder 3
0, the gate plate 38 consisting of a rectangular flat plate that partitions the upper bottom opening S faces the front wall 37 whose upper end is vertical.
The hopper body 33 is fixedly installed in a downwardly inclined rear wall 34 when viewed from the side, maintaining a narrow and constant clearance l, until the lower end intersects with the imaginary extension line P-P of the front downwardly inclined rear wall 34 forming the hopper body 33. reaching length d
By providing a symmetrical notch 39 at the corner position of the lower end of the hopper, it is designed to automatically unbalance the falling pressure of the pellets accommodated in the hopper 8. The problems of the conventional technology mentioned at the beginning can be solved,
Even if a large amount of pellets are thrown into the hopper 8 at one time, it is possible to convey the permissible amount one by one while reliably preventing the bridging phenomenon.

In addition, since the necessary structure for this purpose is extremely simple, the hopper 8 can be mass-produced effectively and can be said to be very profitable.

[Brief explanation of the drawing]

Figure 1 is a side sectional view showing the hopper of the present invention, Figures 2 and 3 are an overall side view and an overall side sectional view of the rotary pellet sorter to which the hopper is attached, and Figures 4 to 6 are the same. 7 is a partially cutaway front view of the hopper; FIG. 8 is a partially enlarged cross-sectional view showing the installation state of the closing plate relative to the pellet conveying tube; FIG. The figure is a slope view of the occlusion plate, No. 1
Figure 0 is a side sectional view to explain the mounting positional relationship of the gate plate to the hopper, Figure 11 is an explanatory diagram showing the order in which pellets fall by the gate plate, and Figure 12 is a part of the conventional hopper. A side sectional view of the notch, and FIG. 13 is a plan view thereof. 8...Hopper, 9...Pellet conveying cylinder, 10
...Dust removal cylinder, 20...Pellet sorting cylinder, 30
... Base cylinder, 33 ... Hopper body, 34 ...
Inclined rear wall, 35, 36... Inclined side wall, 37... Vertical front wall, 38... Gate plate, 39... Notch, 50
...Occluded plate, l...Constant gap, d...Length, S...
...Bottom opening, P-P...virtual extension line.

Claims (1)

[Claims for Utility Model Registration] 1. A large upper hopper body 33 in the shape of a square funnel, and a small square cylinder shape that fits and communicates with the bottom opening S of the hopper body, and the pellets are ejected forward with its forward-sloping bottom surface. hopper 8 consisting of a lower base cylindrical body 30, and a pellet conveying cylinder 9 which faces the forward discharge port of the base cylindrical body 30 and is rotatably driven around a horizontal axis. In a rotary type plastic pellet sorting machine, the pellets fed into the hopper 8 are drawn out and conveyed forward by rotating the pellet conveying tube 9 with respect to the hopper 8 which is installed in a fixed state. Only the front wall 37 is defined as a vertical plane, and in order to face the boundary between the hopper body 33 and the base cylinder 30 with the gate plate 38 consisting of a square flat plate that partitions the bottom opening S, the gate plate 38 , the front wall 3 whose upper end is vertical
7, the front downwardly inclined rear wall 3 is fixedly installed in a downwardly downwardly inclined state in side view while maintaining a narrow constant clearance l, and the lower end thereof forms the hopper main body 33.
By defining the length d reaching the point where it intersects the imaginary extension line P-P of 4, and by providing a symmetrical notch 39 at the corner position of the lower end, the pellets housed in the hopper 8 can be The structure of a hopper in a rotary plastic pellet sorting machine is characterized in that the hopper is set to automatically unbalance the falling pressure in the rotary plastic pellet sorter. 2. The upper large hopper main body 33 and the lower small base cylinder 30 are coupled in a disassembly manner, and the gate plate 38 is attached and integrated with the hopper main body 33, so that the lower end of the gate plate 38 is connected to the base cylinder. The scope of the claim for utility model registration is characterized in that the relationship is set so as to penetrate into the inside of the body 30.
1. Structure of a hopper in the rotary plastic pellet sorting machine according to item 1.