KR101564883B1 - Free fall agitator - Google Patents

Free fall agitator Download PDF

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Publication number
KR101564883B1
KR101564883B1 KR1020150077859A KR20150077859A KR101564883B1 KR 101564883 B1 KR101564883 B1 KR 101564883B1 KR 1020150077859 A KR1020150077859 A KR 1020150077859A KR 20150077859 A KR20150077859 A KR 20150077859A KR 101564883 B1 KR101564883 B1 KR 101564883B1
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KR
South Korea
Prior art keywords
stirring
disk
free fall
stirring disk
fall type
Prior art date
Application number
KR1020150077859A
Other languages
Korean (ko)
Inventor
권순필
김추원
하종인
김병길
이태우
장윤희
박철준
Original Assignee
대구환경공단
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Publication date
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Priority to KR1020150077859A priority Critical patent/KR101564883B1/en
Application granted granted Critical
Publication of KR101564883B1 publication Critical patent/KR101564883B1/en

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING, DISPERSING
    • B01F7/00Mixers with rotary stirring devices in fixed receptacles, i.e. movement of the receptacle not being meant to effect the mixing; Kneaders
    • B01F7/16Mixers with rotary stirring devices in fixed receptacles, i.e. movement of the receptacle not being meant to effect the mixing; Kneaders with stirrers rotating about a substantially vertical axis
    • B01F7/26Mixers with rotary stirring devices in fixed receptacles, i.e. movement of the receptacle not being meant to effect the mixing; Kneaders with stirrers rotating about a substantially vertical axis with rotary discs, e.g. provided with orifices, or co-operating with loose mixing particles, provided with feeding or discharging means or provided with sieves for continuously mixing
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING, DISPERSING
    • B01F15/00Accessories for mixers ; Auxiliary operations or auxiliary devices; Parts or details of general application
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING, DISPERSING
    • B01F15/00Accessories for mixers ; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F15/00435Drives, e.g. for reciprocating motion; Transmissions; Brakes; Couplings
    • B01F15/00487Nature of the drive
    • B01F15/00545Hydraulically driven
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/52Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING, DISPERSING
    • B01F2215/00Auxiliary or complementary information in relation with mixing
    • B01F2215/0001Field of application of the mixing device
    • B01F2215/0052Treatment of water, waste water or sewage

Abstract

A free fall type stirring apparatus is disclosed. A free fall type stirring apparatus according to one aspect of the present invention includes a stirring disk having a mixing hole, a central shaft guiding the stirring disk and provided inside the water tank, a driving part for raising the stirring disk, And the stirring disk stirs the inside of the water tank by free fall.

Description

FREE FALL AGITATOR [0002]
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a free fall type stirring apparatus that stirs a weight by dropping it freely.
Generally, in the water treatment process, the object to be stirred is a particle having a specific gravity similar to that of water or a colloid-mixed aqueous solution state or a gel state concentrated to a certain state or more. The specific gravity of the particles incorporated in such an aqueous solution is 1.0005-1.04 in the case of sludge and 1.02 (on the basis of the sewage facility) on the average, and about 1.25-1.40 in the case of the solid material. The solids contained in the concentrated sludge Is about 1.93.
In the natural state, the particulate mixture or colloid contained in the fluid is sedimented and concentrated by gravity over time, forming layer separation. For this reason, after the mixed aqueous solution is sufficiently stirred, it takes a certain time until the layer separation due to sedimentation occurs. This is because the specific gravity of the particles is similar to that of water, so that the sedimentation becomes small due to the balance of buoyancy and gravity acting on the particles, or the viscosity of the gel state acts as an element that interferes with sedimentation due to gravity of the particles.
Therefore, in the case of such an aqueous solution, sufficient agitation effect can be achieved by intermittent agitation rather than continuous agitation as in the case where sufficient fluidity can be delivered for a short time. As a reference, according to the sewage facility standard, it is known that, in the case of the digester, the water reactor can maintain sufficient agitation by mixing 3 to 6 times a day for 1 to 3 hours when agitation force is sufficient. The agitator of the industrial field is mainly rotating, and the continuous agitator is relatively simple in construction and low in maintenance cost. However, when the agitating volume is large or the water level varies in the water level It is difficult to apply the method of the present invention. In addition, the rotary type stirrer requires a large power to intermittently operate the intermittent operation or to transmit sufficient agitating force for intermittent operation.
Korean Patent Registration No. 10-1239362
SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a free fall type stirring apparatus capable of transmitting sufficient agitation force to a fluid for a short time and consuming less energy.
Other objects of the present invention will become more apparent through the embodiments described below.
A free fall type stirring apparatus according to one aspect of the present invention includes a stirring disk having a mixing hole, a central shaft guiding the stirring disk and provided inside the water tank, a driving part for raising the stirring disk, And the stirring disk stirs the inside of the water tank by free fall.
The free fall type stirring apparatus according to the present invention may include one or more of the following embodiments. For example, the center axis is a shaft having a constant length, and the stirring disk is inserted into the shaft and can move up and down.
The central axis is configured in a multistage manner and its length is variable, and the stirring disk can be coupled to the lower end of the central axis.
The driving unit uses a hydraulic cylinder, and the braking unit can adjust the hydraulic pressure of the hydraulic cylinder.
The braking portion may include a magnetic body such as a permanent magnet inserted in the central axis.
A water level meter for measuring the water level inside the water tank and a control unit for controlling the top dead center of the stirring disk by controlling the driving unit based on the water level information measured by the water level meter.
INDUSTRIAL APPLICABILITY The present invention can provide a free fall type stirring apparatus capable of transmitting sufficient agitation force to a fluid for a short period of time and consuming less energy.
FIG. 1 is a view of a free fall type stirring apparatus according to a first embodiment of the present invention, which illustrates a state in which the stirring disk is elevated.
Fig. 2 illustrates a state in which the stirring disk is lowered in Fig.
3 is a plan view illustrating a stirring disk of the free fall type stirring apparatus of FIG.
4 is a view illustrating the flow of fluid in the water tank when the stirring disk descends in the free fall type stirring apparatus according to the first embodiment.
5 is a view illustrating a free-fall type stirring apparatus according to a second embodiment of the present invention.
6 is a diagram showing that the top dead center of the stirring disk is changed in accordance with the change of the water level.
7 is a block diagram illustrating a free-fall type stirring apparatus according to a second embodiment of the present invention.
BRIEF DESCRIPTION OF THE DRAWINGS The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated in the drawings and will be described in detail in the detailed description. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.
The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout the specification and claims. The description will be omitted.
1 and 2 illustrate a free fall type stirring apparatus 100 according to a first embodiment of the present invention. FIG. 1 illustrates a state in which the stirring disk 140 is lifted. FIG. 2 illustrates a state in which the stirring disk 140 ) Descend by free fall. And Fig. 3 is a plan view illustrating the stirring disk 140. Fig.
Referring to FIGS. 1 to 3, the free fall type stirring apparatus 100 according to the first embodiment is installed in the water tank 110 of the water treatment facility. When the stirring disk 140 having a large weight falls freely, Thereby stirring the inside of the honeycomb structure 110. The free fall type stirring apparatus 100 according to the first embodiment is provided with a stirring disk 140 corresponding to a weight and a free fall type stirring apparatus which guides a free fall of the stirring disk 140, A driving unit 120 for raising the stirring disk 140 and a braking unit (not shown) for restricting the falling of the stirring disk 140. The center shaft 130 has a length,
The agitating disk 140 may have a circular plate shape and may be made of a metal (tungsten or the like) having a large specific gravity. The weight of the stirring disk 140 may be, for example, about 400 to 500 kg. The stirring disk 140 is coupled to the lower end of the center shaft 130 and descends to the bottom of the water tub 110 by its own weight when the locking part of the driving part 120 is released. The inside of the water tank 140 is stirred by the descent of the stirring disk 140. [ The size, weight, and number of the stirring disk 140 may vary depending on the size of the water tub 110, the amount of floating matters, and the like.
Generally, sedimentation by gravity begins to accumulate on the bottom surface of the water tank 110, and the speed of the stirring disk 140 becomes maximum at a point near the bottom surface. Therefore, the stirring disk 140 is free to fall by its own weight and transmits a strong fluid force to the sediment deposited on the bottom surface of the water tub 110 and stirs it, so that the effect can be maximized.
A plurality of mixing holes 142 may be formed in the agitation disk 140. The mixing hole 142 serves to further reduce mixing of the fluid in the water tub 110 by reducing the fluid resistance when the stirring disk 140 descends and transmitting a strong shearing force to the fluid. The size and the number of the mixing holes 142 may be variously selected depending on the size of the water tub 110, the weight and area of the stirring disk 140, and the like.
4 is a view illustrating the flow of fluid in the water tank 110 when the stirring disk 140 descends in the free fall type stirring apparatus 100 according to the present embodiment.
4, the agitating force transmitted to the fluid due to the descent of the agitating disk 140 is generated by the convection inside the water tub 110 generated in proportion to the dropping speed and area of the agitating disk 140, 142). ≪ / RTI >
Although the stirring disk 140 in the free fall type stirring apparatus 100 according to the present embodiment is illustrated as being circular, the present invention is not limited by the shape of the stirring disk. Therefore, it is needless to say that the stirring disk may have various shapes such as a polygonal shape or an elliptical shape. In addition, although the stirring disk 140 is illustrated as being a disk shape, it is needless to say that the stirring disk 140 may have various solid shapes such as a cone or the like.
The stirring disk 140 is connected to the hydraulic cylinder 122 corresponding to the driving unit 120 by the wire 128. The free fall type stirring apparatus 100 according to the present embodiment employs a hydraulic cylinder 122 as a driving unit. Of course, the present invention is not limited by the type of the driving unit, and any apparatus can be used as long as the stirring disk 140 can be lifted up to a certain height.
The hydraulic cylinder 122 can drive the piston 124 by the hydraulic pressure to raise the stirring disk 140. [ Referring to FIG. 1, as the piston 124 is lifted by the hydraulic pressure, the length of the wire 128 is shortened and the stirring disk 140 can be raised. When the locked state of the hydraulic cylinder 122 is released by adjusting the hydraulic pressure applied to the piston 124 in the state of FIG. 1, the stirring disk 140 corresponding to the weight body descends by the free fall, do.
The control unit (not shown) can adjust the elevation height of the stirring disk 140 by controlling the driving unit 120. When the free fall type stirring apparatus 100 performs intermittent stirring, the control unit may increase the stirring time until the next stirring time is reached. The rise time can be done. Further, the speed at which the stirring disk 140 falls freely is formed to be larger than the speed at which the stirring disk 140 is lifted by the driving unit 120.
The center shaft 130 guides the free-falling stirring disk 140 to prevent the stirring disk 140 from swinging in the horizontal direction due to the fluid resistance during the drop. The free fall type stirring apparatus 100 according to the present embodiment has a structure in which the length of the center shaft 130 is variable. That is, the central axis 130 is composed of a multi-stage including a first stage beam 132, a second stage beam 134 and a third stage beam 136, and the beam of each adjacent stage enters or leaves the other beam . Therefore, the length of the central shaft 130 is variable, and when the stirring disk 140 is lifted as shown in FIG. 1, the length thereof is contracted. When the stirring disk 140 is lowered as shown in FIG.
The stirring disc 140 is coupled to the lower end of the three-stage beam 136 located at the lowermost position in the central axis 130. A wire 128 is passed through the first stage 132, the second stage 134 and the third stage 136, and the end of the wire 128 is connected to the stirring disc 140. When the wire 128 is pulled by the driving part 120, the stirring disk 140 rises, and the length of the central shaft 130 becomes short in conjunction with this. Further, when the wire 128 is released by the driving unit 120, the stirring disk 140 descends, and the length of the center shaft 130 becomes longer in conjunction with this.
Of course, the center shaft 130 may not be constructed in a multi-stage structure but may be constituted by a single shaft, which will be described in more detail through a free fall type stirring apparatus 200 according to the second embodiment illustrated in FIG. 5 .
The free fall type stirring apparatus 100 according to the present embodiment includes a braking unit (not shown) for limiting the descent of the stirring disk 140. The braking portion prevents the stirring disk (140) from colliding with the bottom dead center to prevent mechanical damage. Since the free fall type stirring apparatus 100 according to the present embodiment uses the hydraulic cylinder 122 as the driving unit 120, the braking by the braking unit is performed by the hydraulic circuit.
The free fall type stirring apparatus 100 according to the present embodiment performs stirring by freely dropping the stirring disk 140 corresponding to a weight. Since the stirring disk 140 drops with sufficient kinetic energy for a short time, Sufficient stirring effect can be provided for a short time. Further, the stirring disk 140 can rise at a slow speed, and at the time of descent, free fall that does not require energy is required, so that energy consumption can be reduced.
Hereinafter, the free fall type stirring apparatus 200 according to the second embodiment of the present invention will be described with reference to FIGS. 5 to 7. FIG.
5 is a diagram illustrating a free fall type stirring apparatus 200 according to the second embodiment of the present invention. 5, a dotted line indicates a state in which the stirring disk 240 is lowered. 6 is a diagram showing that the top dead center of the stirring disk 240 is changed in accordance with the change of the water level in the free fall type stirring apparatus 200 according to the second embodiment. 7 is a block diagram illustrating a free fall type stirring apparatus 200 according to the second embodiment of the present invention.
5 to 7, the free fall type stirring apparatus 200 according to the second embodiment includes a free falling stirring disk 240, a free fall type stirring apparatus 240 which guides the free fall of the stirring disk 240, A driving unit 220 for raising the stirring disc 240 and a braking unit 250 for restricting the descent of the stirring disc 240. The center shaft 230 is installed inside the stirring shaft 240,
The free fall type stirring device 200 according to the second embodiment is different from the free falling type stirring device 200 according to the first embodiment in that the stirring disk 240 corresponding to the weight is freely dropped and the inside of the water tank 210 is strongly stirred for a short period of time Falling type stirring apparatus 100 according to the present invention. Since the agitation disk 240 of the free fall type agitation apparatus 200 according to the second embodiment is the same as the agitation disk 140 of the free fall type agitation apparatus 100 according to the first embodiment, .
A water gauge 212 may be installed inside the water tank 210. The water level meter 212 measures the water level in the water tank 210 and transmits the result to the control unit 260. The control unit 260 can control the driving unit 220 using the level information measured by the level 212.
The driving unit 220 includes a driving motor 222 for rotating the roller 224 on which the wire 226 is wound. The wire 226 is pulled by the rotation of the driving motor 222, so that the stirring disk 240 rises. In addition, the stirring disc 240 can wait from the top dead center to the stirring time by the brakes built in the inside of the driving motor 222. Then, when the agitation time is reached, the brake device of the driving motor 222 is released, so that the stirring disk 240 falls freely.
In the free fall type stirring apparatus 200 according to the second embodiment, the driving unit 220 is exemplified as using the driving motor 222, but the present invention is not limited by the type of the driving unit. It is needless to say that the driving unit may be anything as long as it can lift the stirring disk 240 corresponding to the weight to a predetermined height (top dead center).
The center shaft 230 corresponds to one shaft, and the stirring disk 240 is inserted. The stirring disk 240 is inserted into the center shaft 230 and falls freely while being stirred. The stirring disk 240 is stirred by the inside of the water tank 210 or is raised by the driving unit 220. Thus, the central shaft 23 serves to guide the vertical movement of the stirring disk 240.
Since the stirring disk 240 moves up and down along the central axis 230, friction may occur in the joining portion. A wear resistant Teflon resin coating may be applied to the surface of the center shaft 230 in order to prevent a problem caused by friction between the center shaft 230 and the stirring disk 240.
One end of the central shaft 230 is in contact with the bottom surface of the water tub 210 and the other end is in contact with the upper surface of the water tub 210. Accordingly, the central axis 230 can also serve to disperse the normal stress of the water tank 210 structure.
Although the free fall type stirring apparatus 200 according to the present embodiment is illustrated as having one central axis 230 in the water tank 210, since the present invention is not limited by the number of the central axis 230 And may have a plurality of central axes. Although the free fall type stirring apparatus 200 according to the present embodiment is illustrated as having one shaft-shaped central axis 230, it may have a foldable central axis 130 as shown in FIG. 1, There is no restriction on structure and kind.
The braking unit 250 prevents collision at the bottom dead center of the stirring disk 240 to prevent mechanical damage. The free fall type stirring apparatus 200 according to the present embodiment uses a ring-shaped magnetic body (for example, neodymium) as the braking unit 250. The ring-shaped magnetic body is inserted into the lower end of the center shaft 230, and forms a brake by the eddy current. The free-falling stirring disk 240 can be stopped at the bottom dead center without mechanical impact by the permanent magnet. The number and size of magnetic substances to be installed may be determined according to the weight of the stirring disk 240. In addition, it is also possible to cut the hollow permanent magnet in half to facilitate the installation.
Although the free fall type stirring apparatus 100 according to this embodiment has been described as having the permanent magnet as the braking unit 250, the present invention is not limited by the type of the braking unit. Therefore, an eddy current brake or the like may be used as the braking section, or a hydraulic circuit such as the stirring device 100 according to the first embodiment may be used.
The control unit 260 may apply a control signal to the driving unit 220 to release the locking state of the driving unit 220 to allow the stirring disc 240 to drop freely. The control unit 260 can determine the operation cycle (for example, continuous operation or intermittent operation) of the stirring disk 240 in consideration of the amount of inflow water to be processed, the amount of the scum (s)
Referring to FIG. 6, the control unit 260 can determine the top dead center of the stirring disk 240 based on the level information inside the water tub 210 received from the water level meter 212. For example, when the water level changes in accordance with time in the water tank 210 (state a in the state a in FIG. 6), the control unit 260 sets the top dead center of the stirring disk 240 to the changed water level As shown in FIG.
In the case of a medium-sized or larger-sized pumping station for relaying sewage or sewage in a sewage treatment plant, the accumulation of floating sludge (s) generated from sewage or sewage and particulate organic matter having a relatively large specific gravity is a problem. In this case, since the operation forming layer moves up and down according to the level of the floating squeak (s), there is no suitable mechanical stirring device at present, and the pump pressurized water is injected by the nozzle to remove the scum layer partly. However, the method of using the pump also has a problem that the removal efficiency is very low according to the water level variation, and the floating scum (s) is the main cause of the generation of the harmful gas and the bad smell due to the secondary decay.
The free fall type stirring apparatus 200 according to the present embodiment can perform efficient stirring in the water level variable water tank. That is, the free fall type stirring apparatus 200 has an advantage that the top dead center of the stirring disk 240 can be operated in conjunction with the water level.
While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. It will be understood that the invention may be varied and varied without departing from the scope of the invention.
100, 200: free fall type stirring device
110, 210: a tank
120, 220:
130, and 230:
140, 240: stirring disk
250:
260:

Claims (6)

  1. A stirring disk provided with a mixing hole and stirring the inside of the water tank while descending by a free fall;
    A center shaft coupled with the stirring disc to guide the stirring disc and formed over the whole height direction of the water tank;
    A driving unit for raising the stirring disk;
    And a braking portion that restricts the lowering of the stirring disk and is located at a lower end of the central shaft.
  2. The method according to claim 1,
    Wherein the braking unit includes a magnetic body inserted into the central shaft.
  3. The method according to claim 1,
    A water level meter for measuring the water level inside the water tank; And
    And a control unit controlling the top dead center of the stirring disk by controlling the driving unit based on the level information measured by the level gauge.
  4. delete
  5. delete
  6. delete
KR1020150077859A 2015-06-02 2015-06-02 Free fall agitator KR101564883B1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101809433B1 (en) 2017-06-13 2017-12-14 오성학 Stirring of livestock feed and high concentration organic digestion tank Screw shaft length variable planetary gear power transmission structure
KR101840165B1 (en) 2017-06-13 2018-03-20 오성학 Variable axial length power transmission structure of livestock manure and high concentration organic matter digester with organic acid tank

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003038947A (en) * 2001-07-27 2003-02-12 Sumitomo Rubber Ind Ltd Agitating apparatus and method for manufacturing golf ball
JP2014018767A (en) * 2012-07-20 2014-02-03 Sankyo Giken Kogyo Kk Filtration method and filtration device
KR101524158B1 (en) * 2014-02-19 2015-05-29 삼성중공업 주식회사 Rising and falling apparatus for tower of wind turbine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003038947A (en) * 2001-07-27 2003-02-12 Sumitomo Rubber Ind Ltd Agitating apparatus and method for manufacturing golf ball
JP2014018767A (en) * 2012-07-20 2014-02-03 Sankyo Giken Kogyo Kk Filtration method and filtration device
KR101524158B1 (en) * 2014-02-19 2015-05-29 삼성중공업 주식회사 Rising and falling apparatus for tower of wind turbine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101809433B1 (en) 2017-06-13 2017-12-14 오성학 Stirring of livestock feed and high concentration organic digestion tank Screw shaft length variable planetary gear power transmission structure
KR101840165B1 (en) 2017-06-13 2018-03-20 오성학 Variable axial length power transmission structure of livestock manure and high concentration organic matter digester with organic acid tank

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