JPH042902Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Industrial application field] This invention can be used to transport powder and granules to air, etc., such as feeding plastic materials to plastic molding machines, or transporting pelleted pharmaceutical raw materials to various processing plants. The rotary feeder is used for transportation by pumping or suctioning transportation gas, and specifically relates to a rotary feeder for taking out a predetermined amount of material from a material supply source.

[Conventional technology]

Conventionally, rotary feeders of this type include (a) the one shown in FIG. 7, (b) the one described in Japanese Patent Application Laid-Open No. 53-71455, and (c) the one described in Japanese Unexamined Utility Model Publication No. 60-107040. ,It has been known.

In the conventional example (a), as shown in FIG.
1 has a hopper 10 as a material supply source.
A material inlet 104 is formed in the lower part of the casing 101, and a material inlet 104 is formed in the lower part of the casing 101 for transporting gas such as air. A discharge port 106 is provided. Material storage recesses 107...107 are radially provided in the rotor 102 at predetermined intervals in the circumferential direction,
The material supplied from the hopper 103 to the material inlet 104 is stored in the material storage recesses 107...107, and as the rotor 102 rotates, the amount of material to be stored is quantified by the scraping action between the rotor 102 and the casing 101. When rotated, the accommodated materials are allowed to fall naturally from the material storage recesses 107...107, and at the same time are discharged by the transport gas from the gas introduction holes 105. This makes it possible to take out a predetermined amount of material corresponding to the rotational speed of the rotor 102 and transport it to a predetermined location from the discharge port 106.

The conventional example (B) has a configuration similar to that of the above (A), with a casing formed with a material inlet,
A rotor having a plurality of material storage recesses formed in a radial manner is rotatably provided, and the material supplied to the material storage recesses is configured to be sent to a destination by the energy of an air source supplied to the lower side of the rotor. . Even material that tends to adhere to and remain in the material storage recess can be blown off by the energy of the air source and transported to the destination.

Fig. 2 of the conventional example (c) shows that the material is placed in the longitudinal direction of the material storage recess of the rotor at the position A indicated by the dashed line in Fig. 7, that is, between the vertical material inlet of the casing and the rotor. A configuration is adopted in which a chevron-shaped spatula member is provided to guide the rotor, thereby reducing material getting caught between the material inlet of the casing and the rotor.

[The problem that the idea aims to solve]

However, in the conventional example (a), as is well known,
Since the material gets caught in the sliding contact surface between the rotor 102 and the casing 101, there are disadvantages such as deformation and destruction of the material and an increase in driving power. In addition, in the case of materials that tend to adhere, the material storage recess 1
07 rotates downward, the material does not fall, and there is a drawback that the material remains attached to the material storage recess 107 and rotates. As a result, there was a problem in that quantitative transportation could not be carried out with high accuracy.

In the conventional example (b), even if the material remains attached to the material storage recess of the rotor, it can be blown off by the energy of the air source and transported to the destination. However, as in the conventional example (a), there was a drawback that the material was caught in the sliding contact surface between the rotor and the casing, which could not be eliminated, and therefore, quantitative transportation could not be carried out with high precision.

In the conventional example (c), the above-mentioned mountain-shaped spatula is provided at the upper opening edge of the casing, so compared to the conventional examples (a) and (b), the relationship between the rotor and the casing is smaller. It is possible to prevent material from getting caught on the sliding surface. However, even in this conventional example (c), the material that moves along the end face of the spatula member still gets caught in the dead space between it and the casing opening edge, so even in this conventional example (c), the material is not caught sufficiently. could not be prevented.

In view of the above points, this invention also prevents the material from getting caught between the rotor and the casing, prevents the material from sticking and remaining in the material storage recess, and enables precise quantitative transportation of the material. It is intended to provide a rotary feeder.

[Means to solve the problem]

In order to achieve the above-mentioned problems, this invention provides a rotor rotatably in which a plurality of material storage recesses are formed radially in a casing in which a material inlet is formed, and the material supplied to the material storage recesses is transferred to an air source. In the rotary leaf feeder, the material inlet of the casing (including the bush) is located at a position to feed the material from the lateral direction of the rotor, and at a position slightly upward in the rotational direction from the material inlet. On the side inner wall, connected to the material inlet,
a clearance that allows the material to be stored in the material storage recess in a state in which it protrudes beyond the outer peripheral surface of the rotor in the radial direction; and a spatula portion that guides and transfers the protruding material in the longitudinal direction of the material storage recess as the rotor rotates. Furthermore, the cross-sectional shape of each material storage recess is formed into a circular arc shape that widens inward, so that a gap is formed when filling the material.

Note that the material discharge port is provided on the lower side of the rotor.

It is preferable that the introduction hole for introducing air from the air source be placed at a position farthest from both the material inlet of the casing and the end of the spatula.

[Effect]

As the rotor is rotated by the drive source,
When the material stored in the material storage recess of the rotor is about to be caught between the rotor and the casing, the material first spills out into the clearance area.
Next, the spatula part pushes the overflowing material over the entire longitudinal length of the material storage recess and scrapes the material uniformly by aligning the upper surface of the material, thereby preventing the material from being caught.

In addition to the action of the clearance part and spatula part mentioned above,
Since the material storage recess is formed to have a gap in which the material is not stored when the material is filled, it is possible to reliably prevent the material from being caught between the outer circumferential surface of the rotor and the inner circumferential surface of the casing.

Furthermore, when the rotor is rotated and the material is discharged, the transport gas introduced from the introduction hole by pressure or suction from the air source is blown into the material storage recess, and the blowing force also Therefore, all the material remaining in the material storage recess can be discharged toward the discharge port.

〔Example〕

An embodiment of this invention will be described below with reference to FIGS. 1 to 6.

1 is a casing, and a rotor 2 is rotatably housed inside the casing 1.

A hopper 3 as an example of a material supply source is attached above the casing 1, and a material inlet 4 connected to the hopper 3 to take out material from the hopper 3 is formed on the lateral side of the casing 1.

As shown in FIG. 2, a motor 5 is connected to the rotor 2 by fitting a key 5a. Furthermore, material storage recesses 6...6 are radially formed on the outer peripheral surface of the rotor 2 at predetermined intervals in the circumferential direction.

A cylindrical bush 7, which also serves as the casing 1, is housed inside the casing 1, and a portion of the bush 7 corresponding to the material inlet 4 is cut out, and at a predetermined location in the circumferential direction, a gas for transportation, as an example, is inserted. Air introduction holes 8 are formed.

A ventilation pipe connecting member 9 is attached to the casing 1 at a position corresponding to the introduction hole 8, and the introduction hole 8 faces the front cover 10 attached to the casing 1 and the gasket 11 inside thereof. A discharge port 12 is formed at a position facing the material storage recess 6 at the same time, and a connecting member 1 is connected to the discharge port 12.
A material transport pipe 14 is connected via 3. Unlike conventional products, this material transport pipe 14 has a minimum inner diameter (for example, a pipe inner diameter of 15 mm or less) that does not block the material being transported, and is formed into a tube shape with a material that is highly slippery and wear-resistant. By adopting a small-diameter pipe, it is possible to make the connecting part between the discharge port 12 of the rotor 2 and the base end of the material transport pipe 14 have the same continuous inner diameter without a step, and the discharge port 1
2 and the proximal end of the material transport pipe 14 to prevent material from clogging.

A ventilation groove 15 is formed on the inner circumferential surface of the bush 7 to communicate the introduction hole 8 and the discharge port 12, so that air is constantly introduced through the introduction hole 8 even when the material storage recess 6 does not face the introduction hole 8. and material transport pipe 14
It is constructed in such a way that the air can provide good transport force to the material inside.

The material inlet 4 is arranged at a position where material is supplied from the lateral direction of the rotor 2. The cross-sectional shape of the material storage recess 6 is, for example, formed into a circular arc shape with a wider depth than a semicircle, and as the rotor 2 rotates, the material is moved into the material storage recess 6 as shown in FIG. When the material is accommodated, a gap (S) is created inside the material, and when it faces the end surface of the bush 7, the material moves to the back side of the material storage recess 6, and the material moves between the outer peripheral surface of the rotor 2 and the bush 7. It is designed to prevent it from being caught between the inner circumferential surface of the

Bush 7 in the direction of the rotational axis of the rotor 2
The width of the material inlet of the casing 1 is smaller than the length of the material storage recess 6 in the longitudinal direction, as shown in FIG. The outer circumferential surface of the rotor 2 and the upper inner wall surface of the bush 7 (casing 1) that extends to the material inlet 4 of the bush 7 in the rotational direction of the rotor 2, that is, the upper inner wall surface of the bush 7 (casing 1) at a position slightly smaller than the material inlet 4 of the bush 7 in the rotational direction of the rotor 2. A pair of left and right clearances 16, 16 are formed by the inner circumferential surface, the notch surface, and the packing 11, respectively, so that the material can be accommodated in the material storage recess 6 in a state protruding outward in the radial direction from the outer circumferential surface of the rotor 2, and , between the two clearances 16, 16 is a spatula part 17 that guides and transfers the protruding material toward both longitudinal ends of the material storage recess 6 as the rotor 2 rotates.
is formed so that the material supplied from the narrow material inlet 4 can be accommodated well over the entire length of the material storage recess 6 in the longitudinal direction.

According to such a configuration, the clearance 1
6 and 16, as the rotor 2 rotates, the spatula part 17 sequentially pushes the material in the longitudinal direction of the material storage recesses 6...6 of the rotor 2, aligning the upper surface of the material and scraping it off uniformly. This has the advantage of eliminating the problem of jamming.

In the figure, A is a rotary feeder, and 23 is a bearing. 24 is a gasket, and this gasket 24 and the gasket 11 sandwich the bush 7 and the rotor 2 to prevent the transportation gas from leaking.

Next, an application example of the rotary leaf feeder A of this embodiment will be explained using FIG. 6.

18 is an air source such as an air compressor or blower, and this air source 18 and material transport pipe 14
are connected via the pressure regulating valve 19, and the material transport pipe 14 is connected to the material receiving part 20,
The material is transported by the force of air. A mixer 21 supplies compressed air into the hopper 3, and is configured to supply compressed air at a predetermined pressure from the air source 18 via a pressure regulating valve 22. Further, although an air source for introducing the transportation gas into the introduction hole 8 is not shown, it may be introduced from the air source 18 via a branch pipe, or may be introduced from a separate air source.

Although the material is transported by pressure from an air source in FIG. 6, it is also possible to transport by suction, for example by connecting a suction type air source to the downstream side of the material transport pipe 14. .

In the above embodiment, in order to control the adverse effects when the air introduced from the introduction hole 8 wraps around the rotor 2 in the circumferential direction, the lower end position of the material inlet 4 and the terminal position of the clearance 16 are It is preferable to arrange the introduction hole 8 at a position that is far away.

In the above embodiment, the air source is connected to the introduction hole 8, and the material can be transported by pumping or suctioning the air.

In the above embodiment, each of the material storage recesses 6...6 is formed halfway from the end surface of the rotor 2 on the one end side in the rotational axis direction. It is formed up to the end face on the other end side, and an introduction hole 8 is formed in one of the both end faces.
Alternatively, the material storage recess 6 may be formed without extending over either end face of the rotor 2 in the rotational axis direction.

Furthermore, the mounting position and structure of the introduction hole 8 are not limited to those of the embodiment described above, and the design can be changed as appropriate.

Furthermore, in the embodiment, the hopper 3 is shown as a material supply source, but for example, a mixing tank, a material storage bag,
It is also possible to use another device and then supply the material to the material inlet 4.

The transportation gas is not limited to air, but argon gas, nitrogen gas, etc. can also be used depending on the physical properties of the material to be transported.

The rotor 2 is not limited to being rotatably provided on the casing 1 via the bush 7, but may also be rotatably provided directly on the casing 1 without providing the bush 7.

[Effect of idea]

According to this invention, (1) The material inlet 4 of the casing 1 (including the bush 7) is arranged at a position where material is supplied from the lateral direction of the rotor 2, and at a position slightly in the rotational direction from this material inlet 4. On the upper inner wall, there is a clearance 16 that is connected to the material inlet 4 and that can store the material in the material storage recess 6 in a state that protrudes radially from the outer peripheral surface of the rotor 2, and a clearance 16 that allows the material that protrudes from the outer peripheral surface of the rotor 2 to be stored in the material storage recess 6. Since the spatula part 17 is provided to guide and transfer the material storage recess 6 in the longitudinal direction as the rotor rotates, the material stored in the material storage recess from the lateral direction of the rotor is transferred between the rotor and the casing. When the material is about to be caught between the casings, the material first protrudes into the clearance portion of the casing located above the material inlet. Next, the protruding material is similarly pushed by the spatula section located above the material inlet of the casing over the entire length of the material storage recess in the longitudinal direction, and the material is cut so that the upper surface of the material is even and uniform. is prevented.

On the other hand, in the conventional example (c), the spatula member extends inward to the upper opening edge of the vertical casing, so material still remains in the dead space between the end face of the spatula member and the casing opening edge. There was a drawback that it caused biting. According to the proposal,
In view of the above configuration, the material received from the material inlet at the horizontal position of the casing is moved to a position above one end by the material storage recess of the rotor, and the functions of the clearance part and spatula part are activated at the above position. Therefore, there is no dead space as in the conventional example (c) above, so
Material jamming between the rotor and casing can be completely eliminated.

(2) The cross-sectional shape of each material collection recess 6 is formed into a circular arc shape that widens inward and is configured so that a gap is formed when filling the material. Because of this, together with the above effects, it is possible to reliably prevent material from getting caught between the rotor and the casing.

In this way, according to this invention, it is possible to prevent material from being caught between the sliding contact surfaces of the rotor and the casing with the above-mentioned simple configuration, and also to prevent material from remaining in the material storage recess of the rotor. Since this eliminates the problem, quantitative transportation can be carried out with high accuracy.

[Brief explanation of the drawing]

1 to 6 each show an embodiment of the present invention. Figure 1 is a front view showing the main parts in cross section;
Fig. 2 is a side view showing the main part of Fig. 1 in cross section, Fig. 3 is a plan view showing the main part of Fig. 1 in cross section, and Fig. 4
The figure is an enlarged sectional view of the main part of FIG. 1, FIG. 5 is a back view of the clearance and spatula part of the bushing as seen from the inside, and FIG. 6 is a schematic diagram of an application example of the present invention. FIG. 7 is a front view showing a main part of the conventional example in cross section. 1... Casing, 2... Rotor, 3... Material supply source (hopper), 4... Material inlet, 6... Material storage recess, 7... Bush (casing), 8
...Introduction hole, 12...Discharge port, 16...Clearance, 17... Spatula part, 18...Air source.

Claims (1)

[Claims for Utility Model Registration] A rotor 2 in which a plurality of material storage recesses 6...6 are formed in a radial manner is rotatably provided in a casing 1 in which a material entrance 4 is formed, and the material supplied to the material storage recesses 6 is rotatably provided. In the rotary leaf feeder, the material inlet 4 of the casing 1 (including the bush 7) is arranged at a position to feed the material from the lateral direction of the rotor 2, and the material inlet 4, a clearance 1 is provided on the upper inner wall at a position in the rotational direction slightly from 4, in line with the material inlet 4, and capable of storing the material in the material storage recess 6 in a state protruding from the outer circumferential surface of the rotor 2 in the radial direction.
6, and remove the protruding material from the rotor 2.
A spatula part 17 is provided to guide and transfer the material storage recess 6 in the longitudinal direction as the material storage recess 6 rotates.Furthermore, the cross-sectional shape of each material storage recess 6 is formed into an arc shape that widens inward, so that there is no gap when filling the material. A rotary leaf feeder characterized in that it is configured so that (S) is formed.