JP3859417B2 - Rotating cylinder sealing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotary cylinder sealing device used in a rotary cylindrical compost production apparatus and the like.
[0002]
[Prior art]
In a conventional rotating cylindrical compost production apparatus, an opening of a cylindrical body is covered with a fixed lid, compost raw materials are accommodated in the cylindrical body, and the raw materials are fermented and composted while rotating the cylindrical body. At this time, the opening of the cylindrical body is covered with a lid, but since both of them rotate during operation and the other is fixed and stopped, it is necessary to prevent the raw material from leaking through the gap between them. is necessary. In addition, since an odor is generated during fermentation, consideration is required to prevent this odor from leaking out of the cylindrical body.
Conventionally, from this point of view, in a rotating cylindrical compost manufacturing apparatus, the rotating cylinder and the fixed lid are sealed by inserting an elastic body such as rubber, and the contents, that is, the malodor generated in the composting raw material and the fermentation process. Prevents gas leaks. In addition, a labyrinth structure is adopted for the sealing portion between the two, and an appropriate combination with an elastic body has also been proposed.
[0003]
[Problems to be solved by the invention]
However, the conventional sealing mechanism has the following drawbacks.
In general, composting raw materials are highly moisture and sticky, and there are also stones, metals, etc. that are not suitable for composting because of their undefined shape. This raw material stays in the rotating cylinder during operation, and is dammed by fixed lids at both ends of the rotating cylinder. As described above, the sealing device is provided between the rotating cylinder and the fixed lid. However, there is a drawback that the raw material and the malignant gas leak from the sealing portion to the outside due to the penetration pressure of the raw material. For example, a rubber seal incorporated between a rotating cylinder and a fixed lid is in direct contact with the raw material, so it is easily damaged by pressure, friction, etc., leading to leakage and the like. Although the use of a rubber O-ring is also conceivable, there is a problem that the frictional resistance leads to power loss, and the ring is destroyed due to the biting of raw materials. In addition to this, there is a labyrinth structure so that the seal part and the raw material do not directly touch each other, and this is combined with a rubber seal, etc., but the raw material passes through the labyrinth structure and reaches the rubber seal, the same as described above. Such a result is caused, so that sufficient sealing performance cannot be obtained.
[0004]
The present invention has been made against the background of the above circumstances, and an object of the present invention is to provide a sealing device that can enhance the sealing performance between the rotating cylinder and the fixed lid without increasing the load on power.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the first invention of the sealing device for a rotating cylinder according to the present invention includes a rotating cylinder that accommodates and rotates the contents, and an axial end of the rotating cylinder that rotates. In the sealing device that seals between the lid that closes the opening of the rotating cylinder without being fixed to the cylinder, a rising portion that protrudes toward the inner peripheral side is provided on the inner peripheral surface of the axial end of the rotating cylinder. It is provided over the entire circumference along the rotation circumferential direction, and protrudes inward in the axial direction on the inner surface of the lid, and the inner surface of the rotating cylinder end edge portion between the lid and the rising portion is defined as a rising portion. A covering portion that covers the joint is provided so as to be discontinuous along the circumferential direction of the rotation, and further, a scraper that removes the contents attached to the inner surface of the end edge of the rotating cylinder is provided. It is characterized by.
[0006]
According to a second aspect of the present invention, there is provided the sealing device for the rotating cylinder according to the first aspect, wherein the cover is disposed over a range exceeding the planned content storage height from the lower side of the lid. It is characterized by being discontinuous due to lack of arrangement on the upper side.
[0007]
According to a third aspect of the present invention, there is provided the rotary cylinder sealing device according to the first or second aspect of the present invention, wherein the rotary cylinder end edge portion on the axially outer side of the rising portion has a gap between the rising portion and the inner periphery. A second rising portion protruding to the side is provided over the entire circumference along the rotational circumferential direction, and the scraper is disposed so that the contents are removed by the scraper between the rising portion and the second rising portion. It is arranged.
[0008]
According to a fourth aspect of the present invention, there is provided the rotary cylinder sealing device according to any one of the first to third aspects, wherein the content of the rotary cylinder is removed at a position where the content is removed by the scraper or on the axially outer side of the second rising portion. It is characterized in that a seal portion for sealing the gap is provided.
[0009]
The sealing device of this invention aims at sealing between the rotation cylinder which accommodates the content and rotates, and the cover which covers the axial direction end opening part of this rotation cylinder.
The contents accommodated in the rotating cylinder are typically exemplified by fermentation raw materials that are sticky and have an indefinite shape and may contain foreign substances such as stones and metals. A rotating cylinder containing the raw material as a content is a suitable target. However, as the present invention, the type of contents is not limited to the raw material for fermentation, but is contained in the above-described apparatus, and a problem of leakage occurs or occurs between the rotating cylinder and the lid during rotation. It is applicable if there is a fear.
[0010]
Moreover, although the cylindrical thing is normally used for the said rotating cylinder, it is not limited to this as this invention, For example, it can also be set as a polygonal cylinder shape. The rotating cylinder is rotated by an appropriate rotation driving source. One or both of the axial ends of the rotating cylinder are open, and the opening is closed with a lid as necessary. The present invention is applied to a case where a lid that is not fixed to the rotating cylinder is installed in the opening.
In the rotating cylinder to which the present invention is applied, the opening may be at one end or at both ends, and it is not necessary that the entire lid is a lid that is not fixed to the rotating cylinder. What is necessary is just a lid | cover which is not fixed to a rotating cylinder.
The lid that is not fixed to the rotating cylinder is usually provided with a raw material charging section and a discharging section, and is fixed to a base or the like, and remains in place without rotating even when the rotating cylinder rotates. However, the present invention does not exclude the case where the lid itself rotates, but can be applied as long as the lid rotates in a state not synchronized with the rotating cylindrical body, and obtains the expected effect. be able to.
[0011]
In the present invention, a rising portion is provided on the inner peripheral surface of the end portion in the axial direction of the rotating cylinder along the entire rotation direction of the rotating cylinder, and the rising portion is formed integrally with the rotating cylinder. It may be made, or another member may be fixed to the rotating cylinder. The height of the rising portion can also be determined as appropriate.
On the other hand, a cover portion protruding inward in the axial direction is provided on the inner surface of the lid. The cover portion may be formed integrally with the lid, or another member may be fixed to the inner surface of the lid. In addition, the protrusion direction of a cover part should just be an axial direction inner side, and does not necessarily need to follow the axial direction itself. In particular, it is desirable to extend toward the inner side in the axial direction so as to gradually expand from the base end side in the lid direction to the outer peripheral side. As a result, the cover part forms an inclined surface that expands in the outer peripheral direction from the outside in the axial direction to the inside, so that the contents that come in contact with it act to push back inward, and the contents accumulate on the rotating cylinder edge side. Therefore, it is possible to prevent the intrusion pressure into the sealing device from being increased.
[0012]
The cover portion reaches the rising portion, and covers the inner surface of the end portion of the rotating cylinder on the axially outer side of the rising portion together with the rising portion. At this time, the cover portion is positioned so that a gap is not generated as much as possible between the cover portion and the rising portion. However, if they come into contact with each other with a strong force, a load is applied to the drive source of the rotating cylinder, so that it is not required that the two are in close contact with each other at normal times. The rising portion and the covering portion may partially overlap, but it is not required to have an overlap if the gap can be reduced. Further, when the cover portion is made of a flexible material and the tip of the cover portion is extended to the upper surface of the rising portion or further to the inner surface side of the rising portion, the cover portion is Since the rising portion is in close contact, it is possible to more effectively prevent the contents from advancing outside the rising portion. Since the adhesion force at this time is sufficiently smaller than the case where both are in contact with each other with a strong force at normal times, the load on the rotary drive device is small.
[0013]
Note that the cover portion is not provided over the entire circumference in the rotational circumferential direction, and is at least partially missing and discontinuous in the circumferential direction. The range and position of the discontinuous portion is not limited to a specific one, but it is desirable that the cover portion is continuous at least on the lower side of the lid, and further, the content storage capacity height from the lower side of the lid. It is more desirable that they are continuously arranged over a range exceeding. This is to effectively prevent the contents from entering the outside in the axial direction of the rising portion on the lower side where the contents are deposited. Further, it is desirable that the discontinuity without the cover portion be located on the upper side of the lid. This is because, when the content is removed by a scraper described later, the content is suitable for dropping by its own weight and removing it inside.
[0014]
As described above, the sealing device includes a scraper that removes the contents attached to the inner surface of the edge portion on the axially outer side of the rising portion. In the scraper having a simple structure, the scraper is placed in a fixed state so that the scraper is positioned near the inner surface of the edge portion, and the contents attached to the inner surface of the edge portion are scraped off as the rotating cylinder rotates. The scraper can be fixed to the lid, for example. However, in the present invention, the scraper is not limited to a fixed type, and may be accompanied by rotational movement or the like. In short, any material that can remove the contents adhering to the inner surface of the edge portion when the rotating cylinder is rotating may be used.
[0015]
The scraper may be disposed so that the scraping portion is positioned at an appropriate distance on the inner surface of the edge portion, or depending on the material, the scraper may be in contact with the inner surface of the edge portion.
Further, the content removed by the scraper is removed to the inside of the rotating cylinder through the discontinuous portion of the covering portion. Therefore, it is important to determine the relationship between the content removal position and the discontinuous portion from this viewpoint. Normally, the content is removed at the discontinuous portion, and it is desirable to remove the content before the rotational position vertex of the rotating cylinder in the rotational direction.
[0016]
Furthermore, it is desirable to provide a second rising portion at the end of the rotating cylinder on the outer side in the axial direction of the rising portion with a distance in the axial direction from the rising portion. The installation position may be the inner surface of the edge portion or the edge portion. Similarly to the first rising portion, the second rising portion may be formed integrally with the rotating cylinder, or another member may be fixed to the rotating cylinder. Furthermore, what connected the 1st rising part and the 2nd rising part with the connection piece provided in the rotating cylinder end edge side may be fixed to a rotating cylinder. When the second rising portion is provided, the contents are removed by the scraper at a groove formed between the first rising portion and the second rising portion. Preferably, the scraper scraping portion is fitted into the groove portion. When fitting, it is desirable to have a slight gap between the first and second rising portions and the inner surface of the end edge portion so as not to apply a load to the drive source.
Further, it is desirable that the outside of the second rising portion is further covered with the second rising portion and a part of the above-described covering portion or another second covering portion. Thereby, the sealing performance at the second rising portion is also improved. The second cover part is provided on the inner surface of the lid so as to protrude inward in the axial direction, similarly to the first cover part. In these cases, a part of the cover portion or the second cover portion is prevented from generating a gap as much as possible with the second rising portion.
[0017]
According to the present invention, the rising portion and the covering portion prevent the raw material from moving further outward. Nevertheless, the contents that have entered the outside of the rising portion are immediately removed (for example, every rotation) by the scraper and removed to the inside, thereby preventing the contents from accumulating outside the rising portion. If this measure is not taken, the contents will gradually accumulate outside the rising portion, and the outward movement pressure will increase.
[0018]
Furthermore, by providing a second rising portion outside the removal portion, it is possible to reliably prevent the content from moving to the outside, and when the content is removed outside by the scraper. Prevent it from spreading. Further, if the outside of the second rising portion is covered with a part of the covering portion or the second covering portion, the above-described prevention effect is further ensured. As a result, the contents are prevented from moving outside the sealing device without applying a load to the rotary drive device and leaking outside.
[0019]
Moreover, when it has the 2nd rising part outside the content removal position by a scraper, or outside the 2nd rising part, it is desirable to provide the sealing part which seals a rotating cylinder edge part and a lid | cover. This seal portion is preferably located between the edge of the rotating cylinder and the lid and is in contact with both without any gap. In this sealing part, since the movement of the contents is prevented by the structure of the sealing device described above, it is sufficient if it can prevent leakage of minute contents and external leakage of odors, and mainly seals the contents. A contact force as high as that of a conventional sealing device is not required. Therefore, the load on the driving device is almost negligible, and the lifetime is greatly increased.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Below, one Embodiment of this invention is described based on FIGS.
A rotating cylinder 1 which is a rotating cylinder is rotatably supported by rollers 2... 2 and is driven to rotate by a driving device not shown in the drawing. Fixed lids 3 and 4 are respectively attached to opening portions at both ends of the rotating cylinder 1 via a sealing device 20 so that the inside and the outside of the rotating cylinder 1 are shut off. A raw material input port 5 is attached to the fixed lid 3, and a discharge port 6 is attached to the other fixed lid 4.
Next, the sealing device 20 of the present invention will be described.
As shown in FIG. 5, a ring plate-shaped rising portion 21 is fixed to the inner peripheral surfaces of both ends of the rotating cylinder 1 so as to protrude to the inner peripheral side, and the outer side of the rising portion 21 (in the direction of the rotating cylinder axis). On the other hand, a second rising portion 22 having a ring plate shape is fixed to the edge of the rotating cylinder, and they are separated from each other by a predetermined distance. Thereby, a groove structure is obtained by the rising portion 21, the second rising portion 22, and the end edge inner surface 1 a of the rotating cylinder 1.
[0021]
On the other hand, on the inner surfaces of the lids 3 and 4, a seal ring (corresponding to a cover portion) 24 that expands from the inner peripheral side position of the second rising portion 22 toward the upper surface of the rising portion 21 while expanding in the outer peripheral direction rotates. Arranged along the rotational circumferential direction of the cylinder 1, the base 24 a of the seal ring 24 is fixed to the inner surfaces of the lids 3 and 4. However, the seal ring 24 lacks about ¼ circumference in the upper part of the lids 3 and 4 and is discontinuous in the circumferential direction. Note that the tip of the seal ring 24 and the upper surface of the rising portion 21 are not in close contact with each other and have a very small gap, and the base 24a and the upper surface of the second rising portion 22 are also in close contact with each other. There is a gap. That is, the said base 24a has a function as a 2nd cover part. With these structures, the above-described groove is covered on the upper side to form a space A having a tubular chamber structure.
A scraper 25 is fixed to the upper part of the lids 3 and 4. The scraper 25 extends inward in the axial direction, and bends to the outer peripheral side at the tip thereof. The tip portion of the scraper 25 serves as a prismatic scraping portion 25a as a first rising portion 21, a second rising portion 22, and an edge. It is fitted in a groove formed by the inner surface 1a with a gap.
[0022]
Further, two ring grooves are formed concentrically on the outer peripheral surface of the second rising portion 22, and ring-shaped sealing materials 26 and 27 are arranged and fixed in these ring grooves. Yes. These seal members 26 and 27 are formed with seal pieces 26a and 27a protruding outward over the entire circumference, and the seal pieces 26a and 27a are in close contact with the inner surfaces of the lids 3 and 4. . That is, the seal portions 26 and 27 constitute a seal portion that seals the edge of the rotating cylinder and the lid.
A drain hole 21a is formed at an appropriate position of the rising portion 21 to prevent the moisture of the raw material from staying in the groove.
[0023]
Next, the operation of the sealing mechanism will be described.
A raw material 7 is introduced into the rotary cylinder 1 from a raw material inlet 5. The specified capacity of the raw material 7 is about ½ of the volume of the rotating cylinder 1. Therefore, the seal ring 24 is disposed up to a position exceeding the height of the raw material 7 as shown in FIG. Has been.
The raw material 7 staying in the rotating cylinder 1 accumulates on the rising portion 21 and the seal ring 24 at both ends of the rotating cylinder 1 and tries to enter the space A through the gap between the rising portion 21 and the seal ring 24 by its own weight pressure. However, when the rotating cylinder 1 is stationary, it is limited by the friction of the raw material 7 itself, the size of the particles, and the like, and the penetration amount is small.
However, the amount of penetration into the space A increases as the rotating cylinder 1 rotates. However, at this time, since the outside of the space A is almost closed by the second rising portion 22 and the base 24a, the invaded raw material 7a does not move further outside and stays in the space A. The raw material 7a that has entered the space A is lifted upward by the rotation of the rotating cylinder 1 (counterclockwise as shown in FIG. 4), and when the material 7a is positioned at a discontinuous portion of the seal ring 24, a part of the material 7a The remaining portion adheres to the inner surface 1 a of the edge of the groove and is lifted together with the rotating cylinder 1. And with rotation, it hits the scraping part 25a of the scraper 25, and everything is scraped off. That is, since the raw material 7a that has entered the space A is scraped off from the groove every time the rotating cylinder 1 rotates, the raw material 7a does not accumulate in the groove. For this reason, the raw material 7 a does not advance further outward from the space A, and there is no raw material passing through the gap between the base 24 a and the second rising portion 22, causing damage to the seals 26 and 27. Don't give. The seals 26 and 27 serve only to seal only the malignant gas, and the seal pieces 26a and 27a reliably prevent the odor from leaking to the outside. Moreover, since there is no intrusion of the raw material, it is not damaged by the raw material, and a long life is obtained.
[0024]
【The invention's effect】
As described above, according to the sealing device of the present invention, on the inner peripheral surface of the axial end portion of the rotating cylinder, the rising portion that protrudes toward the inner peripheral side is provided over the entire circumference along the rotational peripheral direction. A cover portion projecting inward in the axial direction on the inner surface of the lid and covering the inner surface of the end portion of the rotating cylinder between the lid and the rising portion in cooperation with the rising portion along the rotational circumferential direction; Provided with a scraper that removes the contents adhering to the inner surface of the end edge portion of the rotating cylinder, so that it is possible to prevent the intrusion of raw materials and maintain a good sealing property, An excessive burden is not lost on the rotational drive source.
[0025]
Further, the second rising portion protruding to the inner peripheral side having a gap with the rising portion at the edge of the rotating cylindrical body on the outer side in the axial direction of the rising portion extends over the entire circumference along the rotation circumferential direction. If the scraper is disposed so as to remove the contents by the scraper between the rising portion and the second rising portion, the sealing performance can be further ensured.
[0026]
In addition, if a seal is provided between the edge of the rotating cylinder and the lid at the position where the contents are removed by the scraper or on the outer side in the axial direction of the second rising part, odor leakage from the rotating cylinder is ensured. In addition, since the advance of the raw material or the like does not reach the seal portion, damage due to contact with the raw material can be avoided, and the life of the seal portion can be greatly extended.
[Brief description of the drawings]
FIG. 1 is a front view showing a rotary cylindrical fermentation apparatus including an embodiment of the present invention.
FIG. 2 is a right side view of the same.
FIG. 3 is also a longitudinal sectional view.
4 is a cross-sectional view taken along the line IV-IV in FIG. 1 and omits a rising portion 21. FIG.
FIG. 5 is an enlarged longitudinal sectional view in front showing the upper side (cross-sectional view taken along line VV in FIG. 4) and the lower side of the sealing device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rotating cylinder 2 Roller 3 Fixed lid 4 Fixed lid 5 Raw material inlet 6 Discharge port 7 Raw material 20 Sealing device 21 First rising portion 22 Second rising portion 24 Seal ring 25 Scraper 25a Scraping portion 26 Seal material 26a Sealing piece 27 Seal Material 27a Seal piece

Claims (4)

A sealing device that seals between a rotating cylinder that accommodates and rotates the contents, and a lid that is positioned at an axial end of the rotating cylinder and closes the opening of the rotating cylinder without being fixed to the rotating cylinder. A rising portion projecting toward the inner peripheral side is provided on the inner peripheral surface of the end portion in the axial direction of the rotating cylindrical body over the entire circumference along the rotational peripheral direction, and an axial direction is provided on the inner surface of the lid. A cover that protrudes inward and covers the inner surface of the end portion of the rotating cylinder between the lid and the rising portion together with the rising portion is provided along the rotational circumferential direction and partially discontinuous. And a rotary cylinder sealing device further comprising a scraper that removes the contents attached to the inner surface of the end edge portion of the rotary cylinder. The cover portion is disposed over a range exceeding the content storage capacity height from the lower side of the lid, and is discontinuous due to lack of arrangement on the upper side of the lid. Item 1. A rotating cylinder sealing device according to Item 1 A second rising portion projecting toward the inner periphery side is provided over the entire circumference along the rotation circumferential direction at the edge of the rotating cylindrical body on the outer side in the axial direction of the rising portion and having a gap with the rising portion. 3. The sealing of the rotating cylinder according to claim 1, wherein the scraper is arranged so that the contents are removed by the scraper between the rising portion and the second rising portion. apparatus The seal part which seals between a rotation cylinder body edge part and a lid | cover is provided in the axial direction outer side of the content removal position by a scraper, or a 2nd rising part, The any one of Claims 1-3 characterized by the above-mentioned. The rotary cylinder sealing device according to claim

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