Material stirring device

Abstract

To provide a material stirring device including a seal mechanism which enables easy maintenance of a seal member.SOLUTION: A material stirring device includes: a rotary container 1 which houses a material therein and rotates; a lid member 5 which opens or closes an upper opening of the rotary container 1; and a seal mechanism 30 which seals a gap between the rotary container 1 and the lid member 5. The seal mechanism 30 includes at least a seal member 36 attached to the rotary container 1. A seal surface with which the seal member 36 makes pressure contact is formed by a side surface of a seal ring 33 connected to the lid member 5 or a lower surface of the lid member 5.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a raw material mixing device that performs various processes such as granulating, coating, mixing, kneading, stirring, and drying raw materials, and in particular to a raw material mixing device equipped with a sealing mechanism that seals the gap between a rotating container that contains raw materials and rotates, and a lid member that opens and closes the upper opening of the rotating container. [Background technology]

[0002] A raw material agitation device is a device that performs various processes such as granulation, coating, mixing, kneading, agitation, and drying of raw materials, and is used in various industrial fields such as medicines, chemicals, food, cosmetics, fine chemicals, castings, building materials, paints, and dust treatment. Such raw material agitation devices generally include a rotating container that is driven to rotate around a central axis, a lid member that opens and closes the upper opening of the rotating container, and a sealing mechanism that seals the gap between the rotating container and the lid member (see, for example, Patent Document 1). The raw materials to be processed by the raw material agitation device are introduced into the rotating container from the upper opening of the rotating container, and then the upper opening of the rotating container is closed by the lid member. The above-mentioned various processes are performed by rotating the rotating container at a predetermined rotation speed.

[0003] The sealing mechanism prevents leakage of raw materials from a gap between the rotating container and the lid member and intrusion of foreign matter from the outside into the rotating container while various processes are being performed. Such a sealing mechanism includes a sealing member connected to the lower surface of the lid member, and the sealing member is pressed against the inner peripheral surface of the rotating container with a predetermined pressing force. While various processes are being performed by the raw material mixing device, the rotating container into which the raw materials have been charged is rotated, but the lid member and the sealing member connected to the lid member are not rotated. When a product is to be removed from the rotating container, the lid member is separated from the rotating container (e.g., raised) to expose the upper opening of the rotating container.

[0004] In this specification, the materials fed into the rotating vessel of the raw material mixing device are collectively referred to as "raw materials". The raw materials may be solid materials such as powder and sludge, liquid materials such as water and oil, or a mixture of solid and liquid materials. In addition, in the raw material mixing device, each of a plurality of materials may be fed into the rotating vessel at a predetermined time interval. For example, a solid material may be fed into the rotating vessel, the rotating vessel may be rotated, and then a liquid material may be fed into the rotating vessel after a predetermined time has elapsed. In this case, the raw materials are solid and liquid materials. In addition, in this specification, the objects taken out of the rotating vessel after various processes are performed are collectively referred to as "products". [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2020-203252 A Summary of the Invention [Problem to be solved by the invention]

[0006] In recent years, raw material mixing devices have come to be used frequently in industries (e.g., pharmaceuticals, cosmetics, food, etc.) that have a strong desire to prevent foreign matter from being mixed into products as much as possible. In these industries, it is sometimes even undesirable for foreign matter that has adhered to the sealing member of the sealing mechanism during a previous process to be mixed into the product during a subsequent process. For this reason, an increasing number of users wish to remove the sealing member from the lid member and perform frequent maintenance (e.g., after each batch process) to clean or replace the sealing member.

[0007] On the other hand, when performing maintenance on the sealing member in the conventional raw material mixing device, it is necessary to lift the lid member from the rotating container. However, since the sealing member, which is the most desired to be maintained, is provided on the lid member, when the lid member is lifted from the rotating container, the sealing member, which is the maintenance target, also moves upward. Therefore, there is a problem that it is difficult for the operator to access the sealing member.

[0008] In particular, when the cover member is provided with an auxiliary device such as a rotor unit that stirs the raw material in the rotary container, the cover member needs to be raised higher in order to perform maintenance on the seal member. Therefore, the larger the size of the rotary container, the higher the seal member moves, which deteriorates the workability of the workers, and in some cases, a dedicated scaffold needs to be provided for maintenance of the seal member.

[0009] Therefore, the present invention provides a raw material mixing device equipped with a sealing mechanism that allows easy maintenance of the sealing member. [Means for solving the problem]

[0010] In one aspect, a raw material mixing device is provided, comprising: a rotating container that stores raw materials therein and rotates; a lid member that opens and closes an upper opening of the rotating container; and a sealing mechanism that seals a gap between the rotating container and the lid member, wherein the sealing mechanism includes at least a sealing member attached to the rotating container, and when the lid member closes the upper opening of the rotating container, a sealing surface against which the sealing member is pressed is formed from a side surface of a seal ring connected to the lid member, or is formed from an underside of the lid member.

[0011] In one aspect, the sealing surface is a side surface of the sealing ring, the sealing member is a lip seal having at least one lip pressed against the sealing surface, and the lip is pressed against the sealing surface from the side. In one embodiment, the sealing surface is the underside of the cover member, the sealing member is a lip seal having at least one lip pressed against the sealing surface, and the lip is pressed against the sealing surface from above. In one embodiment, the raw material agitation device further includes a pressure reduction line for reducing the pressure in the internal space of the rotary vessel after the lid member closes the upper opening of the rotary vessel. In one embodiment, the sealing member has a guide portion on its outer periphery, which serves as a guide when the sealing member is attached to the rotating container. Effect of the Invention

[0012] According to the above aspect, since the sealing member is attached to the rotating container that does not move up and down, the height direction of the sealing member does not change even if the lid member is moved upward. Therefore, the sealing member can be easily accessed by workers and maintenance of the sealing member can be easily performed. [Brief description of the drawings]

[0013] [Figure 1] FIG. 1 is a front view of a raw material stirring device according to one embodiment. [Diagram 2] FIG. 2 is a side view of the raw material agitation device shown in FIG. [Diagram 3] FIG. 3 is a schematic diagram showing an example of a suction device provided in the raw material agitator. [Figure 4] FIG. 4 is a schematic cross-sectional view for explaining a sealing mechanism according to one embodiment. [Diagram 5] FIG. 5 is a schematic diagram showing a state in which the cover member shown in FIG. 4 has been moved upward. [Figure 6] FIG. 6(a) is a schematic cross-sectional view showing a modification of the lip seal shown in FIG. 4, and FIG. 6(b) is a partial top view of the lip seal shown in FIG. 6(a). [Figure 7] FIG. 7(a) is a schematic cross-sectional view for explaining a sealing mechanism according to another embodiment, and FIG. 7(b) is a schematic cross-sectional view for explaining a sealing mechanism according to yet another embodiment. [Figure 8] 8(a), 8(b), and 8(c) are each a schematic cross-sectional view for explaining a sealing mechanism according to still another embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a front view of a raw material stirring device according to one embodiment. Fig. 2 is a side view of the raw material stirring device shown in Fig. 1. As shown in Figs. 1 and 2, the raw material stirring device includes a rotating container (mixing pan) 1 that accommodates raw materials and rotates, a first driving device (motor) 2 for rotating the rotating container 1, a rotor unit 3 that stirs the raw materials in the rotating container 1, and a second driving device (motor) 4 for rotating the rotor unit 3.

[0015] In this embodiment, the driving devices 2 and 4 are connected to a control device (not shown), and the control device is configured to freely control the rotation speed and rotation direction of these driving devices 2 and 4. With this configuration, the rotating vessel 1 and the rotor unit 3 can be rotated independently at desired rotation speeds and in desired directions.

[0016] The rotating vessel 1 has a bottomed cylindrical shape and is rotatably disposed inside the cover 9. In this embodiment, a lid member 5 is provided on the top of the cover 9, and the opening formed at the upper end of the rotating vessel 1 is closed by the lid member 5. As shown in FIG. 1, the lid member 5 has a supply port 5a for supplying raw materials to the rotating vessel 1. The raw materials may be directly supplied into the rotating vessel 1 from the supply port 5a, or the raw materials may be supplied to the rotating vessel 1 through the raw material supply equipment (not shown) such as a chute, nozzle, or hopper connected to the supply port 5a and the raw materials are supplied to the rotating vessel 1 via the raw material supply equipment and the supply port 5a. When a product is manufactured, the rotating vessel 1 and the rotor unit 3 into which the raw materials have been introduced are rotated. In one embodiment, the cover 9 may be omitted. In this case, for example, the raw materials are supplied to the rotating vessel 1 from an opening formed at the upper end of the rotating vessel 1. The lid member 5 is configured to close only the opening of the rotating vessel 1.

[0017] In the embodiment shown in Figs. 1 and 2, the cover 9 and the upper opening of the rotating vessel 1 are opened by lifting the lid member 5 in a direction parallel to the rotation axis of the rotating vessel 1 by a driving mechanism (e.g., an air cylinder, a hydraulic cylinder, or an electric cylinder) not shown. Although not shown, the cover 9 and the upper opening of the rotating vessel 1 may be opened and closed by rotating the lid member 5 about a pivot. When the lid member 5 is lifted and the upper opening of the rotating vessel 1 is opened, raw materials may be fed into the rotating vessel 1 from the upper opening. In this case, the supply port 5a may be omitted. When the product is to be removed from the rotating vessel 1, the lid member 5 may be lifted and the upper opening of the rotating vessel 1 may be opened.

[0018] In one embodiment, a discharge port (not shown) for removing the product from the rotating vessel 1 may be formed on the bottom wall or side wall of the rotating vessel 1. When a discharge port is provided on the rotating vessel 1, the raw material mixing device may have a discharge port gate capable of opening and closing the discharge port. In this case, when the product is removed from the rotating vessel 1, the discharge port gate blocking the discharge port is moved to open the discharge port. Furthermore, the raw material mixing device may have a suction line connectable to the discharge port. In this case, the product is sucked out of the rotating vessel 1 through the suction line connected to the discharge port.

[0019] In one embodiment, the raw material agitation device may further include a suction device for removing the product from the rotating container 1. FIG. 3 is a schematic diagram showing an example of a suction device provided in the raw material agitation device. The suction device 50 shown in FIG. 3 includes a vacuum source 51, a suction nozzle 53 that penetrates the cover member 5 and is inserted into the product in the rotating container 1, and a suction line 58 that extends from the suction nozzle 53 to the vacuum source 51. The suction nozzle 53 extends into the rotating container 1 through a through hole formed in the cover member 5. In this embodiment, the direction in which the suction nozzle 53 extends is parallel to the central axis of the rotating container 1.

[0020] The suction device 50 is also connected to a control device (not shown), which is configured to control the operation of the suction device 50. When the control device activates the vacuum source 51 of the suction device 50, the product in the rotating container 1 together with air is sucked into the suction line 58 from an opening (suction port) formed at the tip of the suction nozzle 53. In the following description, the air containing the product that is sucked through the suction nozzle 53 and flows through the suction line 58 may be referred to as "mixed air."

[0021] The suction device 50 shown in Fig. 3 further includes a filter 55, which is an example of a collector that is disposed in the suction line 58 and collects the product. The filter 55 separates and collects the product from the mixed air flowing through the suction line 58. The collector is not limited to the filter 55, so long as it is capable of separating the product from the mixed air. For example, the collector may be a solid separation device such as a cyclone.

[0022] A backwash line 60 and a recovery line 61 are connected to the filter 55. The backwash line 60 is connected to a gas supply source (not shown). Furthermore, an opening / closing valve 62 is arranged on the backwash line 60. A recovery container 65 is connected to the end of the recovery line 61. After stopping the operation of the vacuum source 51, the control device opens the opening / closing valve 62 to supply pressurized gas to the filter 55 and transport the collected product to the recovery container 65 via the recovery line 61. The suction line 58 is preferably a flexible tube. In this case, the filter 55 and the recovery container 65 can be easily moved to a desired position.

[0023] In the raw material mixing device having such a configuration, a predetermined amount of raw materials is put into the rotating vessel 1, and the rotating vessel 1 with its upper opening closed by the lid member 5 is rotated, and at the same time, the rotor unit 3 is rotated inside the rotating vessel 1, thereby performing various processes such as granulation, coating, mixing, kneading, stirring, and drying of the raw materials. While the raw material is being processed, the lid member 5 does not rotate even if the rotating vessel 1 and the rotor unit 3 rotate.

[0024] In order to prevent the raw material from leaking from the gap between the rotating vessel 1 and the cover member 5 while the above-mentioned processing is being performed, the raw material agitator has a sealing mechanism disposed between the rotating vessel 1 and the cover member 5. The gap between the rotating vessel 1 and the cover member 5 is sealed by this sealing mechanism.

[0025] FIG. 4 is a schematic cross-sectional view for explaining a sealing mechanism according to one embodiment. The sealing mechanism 30 shown in FIG. 4 is attached to the upper end of the rotating container 1 and includes a lip seal (sealing member) 36 having two lips 36a, 36b. The lip seal 36 may be composed of one member having an annular shape, or may be composed of two semicircular halves. In one embodiment, the lip seal 36 may be composed of three or more divided bodies. In this case, when all the divided bodies are combined, the lip seal 36 having an annular shape as a whole is formed.

[0026] A flange portion 1a is formed at the upper end of the rotating vessel 1 and functions as a seal base on which a lip seal 36 is attached. In this embodiment, the flange portion 1a is formed around the entire circumference of the rotating vessel 1 and has an annular shape. The lip seal 36 is attached to the flange portion 1a of the rotating vessel 1 by a plurality of fasteners (not shown). An example of the fastener is a screw, which is easy to handle and readily available on the market. When the fastener is a screw, a plurality of screw holes (not shown) are formed in the upper surface of the flange portion 1a.

[0027] The sealing mechanism 30 further includes a seal ring 33 connected to the cover member 5. The seal ring 33 shown in Fig. 4 is formed integrally with the cover member 5 on the lower surface of the cover member 5, and has a disk shape. The central axis of this seal ring 33 coincides with the central axis of the rotating vessel 1.

[0028] The seal ring 33 shown in FIG. 4 has a side surface 33a that constitutes a seal surface that comes into contact with the lip seal 36. In this embodiment, the seal ring 33 has a truncated cone shape that decreases in diameter downward. Therefore, the diameter of the seal surface 33a gradually decreases downward. In one embodiment, the seal ring 33 may be formed separately from the cover member 5 and connected to the cover member 5 with a connector such as a screw, or may be fixed to the cover member 5 by welding or the like. In these cases, when the seal ring 33 is connected or fixed to the cover member 5, the central axis of the seal ring 33 coincides with the central axis of the rotating vessel 1.

[0029] The lip seal 36 shown in FIG. 4 is a double lip seal having a first lip 36a and a second lip 36b that are pressed against the seal ring 33 attached to the lower surface of the cover member 5 when the cover member 5 closes the upper opening of the rotary container 1, and a lip seal body 36c. The second lip 36b is disposed above the first lip 36a. The lip seal body 36c has an annular shape. The first lip 36a extends from the lower surface of the lip seal body 36c over the entire circumference of the lip seal body 36c, and the second lip 36b extends from the upper surface of the lip seal body 36c over the entire circumference of the lip seal body 36c. Therefore, when the cover member 5 closes the upper opening of the rotary container 1, the lip seal 36 seals the gap between the cover member 5 and the rotary container 1 over the entire circumference of the rotary container 1. In this embodiment, when the lip seal 36 is fixed to the flange portion 1a of the rotating vessel 1, the central axis of the lip seal main body 36c having an annular shape coincides with the central axis of the rotating vessel 1.

[0030] The lip seal 36 is selected from a material having a certain degree of elasticity that can exhibit appropriate sealing performance. Such a material is, for example, synthetic rubber. The synthetic rubber constituting the lip seal 36 is preferably selected from synthetic rubbers that are widely used as materials for general sealing members. This is because the lip seal 36 can be manufactured inexpensively. Examples of such synthetic rubber include nitrile rubber (NBR), urethane rubber (U), chlorosulfonated polyethylene (CSM), and ethylene propylene rubber (EPM, EPDM). Note that the material of the lip seal 36 is not limited to synthetic rubber as long as it has appropriate elasticity. For example, the lip seal 36 may be made of resin.

[0031] The seal ring 33 connected to the lid member 5 has a side surface 33a against which the lips 36a, 36b of the lip seal 36 attached to the rotating vessel 1 are pressed when the lid member 5 closes the upper opening of the rotating vessel 1, and this side surface 33a functions as a seal surface against which the lips 36a, 36b are pressed with a predetermined pressing force. By pressing the lips 36a, 36b of the lip seal 36 against the side surface 33a of the seal ring 33 with a predetermined pressing force, the gap between the rotating vessel 1 and the lid member 5 is sealed, preventing the raw material from leaking from the gap and preventing foreign matter from entering the rotating vessel 1 through the gap.

[0032] As shown in Fig. 4, the raw material agitation device may include a decompression line 45 for decompressing the internal space of the rotating vessel 1 sealed by the sealing mechanism 30. The decompression line 45 is connected to a vacuum source (not shown), and the pressure in the internal space of the rotating vessel 1 is reduced by operating the vacuum source. By decompressing the internal space of the rotating vessel 1 while rotating the rotating vessel 1 and performing the above-mentioned various processes, the lip seal 36 tightly adheres to the sealing surface, which is the side surface 33a of the seal ring 33, so that leakage of raw materials from the gap between the rotating vessel 1 and the lid member 5 is more effectively prevented, and foreign matter is more effectively prevented from entering the rotating vessel 1 through the gap.

[0033] FIG. 5 is a schematic diagram showing a state in which the lid member shown in FIG. 4 has been moved upward. As shown in FIG. 5, even if the lid member 5 is moved upward, the rotating vessel 1 does not move up and down, so the position of the lip seal 36 in the height direction does not change. As a result, workers can easily access the lip seal 36, and maintenance of the lip seal 36 (e.g., cleaning or replacement) can be easily performed. In particular, there is no need to provide a dedicated scaffold for performing maintenance of the lip seal 36. Therefore, it is possible to provide a raw material mixing device that can meet the user's desire to perform frequent maintenance of the lip seal 36.

[0034] Fig. 6(a) is a schematic cross-sectional view showing a modified example of the lip seal shown in Fig. 4, and Fig. 6(b) is a partial top view of the lip seal shown in Fig. 6(a). The lip seal 36 shown in Fig. 6(a) and Fig. 6(b) differs from the lip seal 36 shown in Fig. 4 in that it has a guide portion 38 provided on its outer circumferential edge.

[0035] The lip seal 36 shown in FIG. 6(a) and FIG. 6(b) has a plurality of guide parts 38. Each guide part 38 has the same shape, and the plurality of guide parts 38 are arranged at equal intervals on the outer periphery of the lip seal 36. The guide parts 38 may be formed, for example, from a resin or from an elastic material such as rubber. These guide parts 38 allow the lip seal 36 to be appropriately and quickly installed on the flange part 1a of the rotating container 1. Furthermore, by arranging a fastener (screw) 39 for fixing the lip seal to the rotating container 1 in the gap between the adjacent guide parts 38, the lip seal 36 can be easily removed from the rotating container 1 and attached to the rotating container 1. That is, the workability when performing maintenance of the lip seal 36 is improved.

[0036] Although not shown, the lip seal 36 may have one guide portion 38 extending along the entire outer circumferential edge thereof.

[0037] Fig. 7(a) is a schematic cross-sectional view for explaining a sealing mechanism according to another embodiment, and Fig. 7(b) is a schematic cross-sectional view for explaining a sealing mechanism according to yet another embodiment. The sealing mechanism 30 shown in Fig. 7(a) and Fig. 7(b) is a modified example of the sealing mechanism 30 shown in Fig. 4. The sealing mechanisms 30 shown in Figs. 4, 7(a), and 7(b) are common in that when the upper opening of the rotating container 1 is closed with the cover member 5, the lip seal 36, which is a sealing member, is pressed from the side against the sealing surface, which is the side surface 33a of the seal ring 33 connected to the lower surface of the cover member 5.

[0038] In the embodiments shown in Figures 4, 7(a), and 7(b), the side surface 33a of the seal ring 33 extends in the direction of the central axis of the rotary vessel 1. In these embodiments, the side surface 33a may extend parallel to the central axis of the rotary vessel 1 as in the embodiment shown in Figure 7(b), or may extend obliquely with respect to the central axis of the rotary vessel 1 as shown in Figures 4 and 7(a).

[0039] In the embodiment shown in Fig. 7(a), the flange portion 1a to which the lip seal 36 of the sealing mechanism 30 is attached is composed of an expanded diameter portion 1a1 expanded from the main body 1b of the rotating vessel 1, and an end portion 1a2 formed at the upper end of the expanded diameter portion 1a1 and to which the lip seal 36 is fixed. In this configuration, while the rotating vessel 1 is rotating to perform various processes, the raw material (or product) in the rotating vessel 1 is less likely to reach the lip seal 36, preventing contamination of the lip seal 36. As a result, it becomes easier to clean the lip seal 36, and further, the effect of reducing the frequency of replacement of the lip seal 36 can be expected.

[0040] In the embodiment shown in FIG. 7(b), the side surface (seal surface) 33a of the seal ring 33 connected to the cover member 5 extends parallel to the central axis of the rotary container 1. With such a configuration, the structure of the seal mechanism 30 is simplified, and the manufacturing cost of the raw material mixing device is reduced. Furthermore, the seal pressure at which the lips 36a, 36b of the lip seal 36 are pressed against the seal surface 33a can be easily adjusted. More specifically, an adjustment tool (not shown) such as an adjustment bolt or an adjustment screw for adjusting the contact pressure (i.e., the seal pressure) of the lip seal 36 against the seal surface 33a is easily accessible to an operator. Therefore, an operator can easily adjust the seal pressure without needing special tools or advanced skills when fine-tuning the seal pressure. For example, if the adjustment tool is an adjustment bolt or an adjustment screw, the operator only needs to tighten or loosen the adjustment tool to fine-tune the seal pressure.

[0041] 8(a), 8(b), and 8(c) are schematic cross-sectional views for explaining a sealing mechanism according to still another embodiment. In the embodiment shown in Fig. 8(a) to Fig. 8(c), the sealing surface against which the lips 36a and 36b of the lip seal 36 are pressed is the lower surface 5b of the cover member 5. The sealing mechanisms 30 shown in Fig. 8(a) to Fig. 8(c) are common in that when the upper opening of the rotating container 1 is closed with the cover member 5, the lip seal 36, which is a sealing member, is pressed from above against the sealing surface, which is the lower surface 5b of the cover member 5.

[0042] 8(a) has two lips 36a, 36b separated in the vertical direction, which is common to the lip seal 36 shown in Fig. 4, but the size of the tip of the first lip 36a pressed against the lower surface 5b of the lid member 5 is different from the size of the tip of the second lip 36b. More specifically, a straight line (imaginary line) connecting the apex of the tip of the first lip 36a and the apex of the tip of the second lip 36b is parallel to the lower surface 5b of the lid member 5 and perpendicular to the central axis of the rotating container 1.

[0043] 8(b), the seal body 36c is disposed at an angle to the central axis of the rotating container 1, while the straight line (imaginary line) connecting the apex of the tip of the first lip 36a and the apex of the tip of the second lip 36b is parallel to the lower surface 5b of the lid member 5 and perpendicular to the central axis of the rotating container 1. The outer peripheral edge of the flange portion 1a of the rotating container 1 is inclined downward, and the first lip 36a of the lip seal 36 is fixed to this inclination.

[0044] 8(c) of the lip seal 36 of the sealing mechanism 30, the first lip 36a and the second lip 36b are inclined toward the outside of the rotating container 1. In the embodiment shown in FIG. 8(c) as well, the straight line (imaginary line) connecting the apex of the tip of the first lip 36a and the apex of the tip of the second lip 36b is parallel to the lower surface 5b of the lid member 5 and perpendicular to the central axis of the rotating container 1.

[0045] Even in the embodiment shown in Figures 8(a) to 8(c), when the lid member 5 closes the upper opening of the rotating vessel 1, the lower surface 5b of the lid member 5 presses the ribs 36a, 36b of the lip seal 36 attached to the rotating vessel 1 with a predetermined pressing force, thereby sealing the gap between the rotating vessel 1 and the lid member 5, preventing the raw material from leaking from the gap and preventing foreign matter from entering the rotating vessel 1 through the gap.

[0046] On the other hand, even if the cover member 5 is moved upward, the rotating container 1 does not move up or down, so the position of the lip seal 36 in the height direction does not change. As a result, workers can easily access the lip seal 36, and can easily perform maintenance of the lip seal 36 (for example, cleaning or replacement).

[0047] In the above-described embodiment, the lip seal 36 having the first lip 36a and the second lip 36b has been described as an example of the seal member. However, the seal member is not limited to this example. For example, the seal member may be a lip seal having a single lip, or may be a lip seal having three or more lips. Alternatively, the seal member may be a general-purpose seal member such as an O-ring.

[0048] The above-described embodiments have been described for the purpose of enabling a person having ordinary skill in the art to practice the present invention. Various modifications of the above-described embodiments are naturally possible for a person skilled in the art, and the technical idea of ​​the present invention can be applied to other embodiments. Therefore, the present invention is not limited to the described embodiments, but is to be interpreted in the broadest scope according to the technical idea defined by the claims. [Explanation of symbols]

[0049] 1 Rotating vessel (mixing pan) 1a Flange part 2. First Drive Unit 3 Rotor Unit 4. Second Drive Unit 5 Cover member 5a Supply port 5b Bottom surface (sealing surface) 7 Mounting 9 Cover 10. Driving force transmission mechanism 30 Sealing mechanism 33 Seal ring 33a Side (seal surface) 36 Lip seal (sealing material) 36a First Lip 36b 2nd Lip 38 Guide section 39 Screws (fixtures) 45 Pressure Reducing Line 50 Suction device

Claims

1. A rotating container that accommodates raw materials therein and rotates; A cover member for opening and closing an upper opening of the rotary container; a sealing mechanism for sealing a gap between the rotating container and the lid member, The sealing mechanism includes at least a sealing member attached to the rotating container, a sealing surface against which the sealing member is pressed when the lid member closes the upper opening of the rotating vessel is formed from a side surface of a seal ring connected to the lid member, or from a lower surface of the lid member.

2. the seal surface is a side surface of the seal ring, The seal member is a lip seal having at least one lip that is pressed against the seal surface, The raw material mixing device according to claim 1 , wherein the lip is pressed against the sealing surface from a side.

3. the sealing surface is a lower surface of the lid member, The seal member is a lip seal having at least one lip that is pressed against the seal surface, The raw material mixing device according to claim 1 , wherein the lip is pressed against the sealing surface from above.

4. 2. The raw material mixing device according to claim 1, further comprising a pressure reducing line for reducing the pressure in the internal space of the rotary vessel after the lid member closes the upper opening of the rotary vessel.

5. 5. The raw material agitation device according to claim 1, wherein the sealing member has a guide portion on an outer periphery thereof, the guide portion serving as a guide when the sealing member is attached to the rotating container.

Images