CN206872809U - Wheeled both arms turn over polishing apparatus - Google Patents
Wheeled both arms turn over polishing apparatus Download PDFInfo
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- CN206872809U CN206872809U CN201720803066.3U CN201720803066U CN206872809U CN 206872809 U CN206872809 U CN 206872809U CN 201720803066 U CN201720803066 U CN 201720803066U CN 206872809 U CN206872809 U CN 206872809U
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- turn over
- cincture
- support arm
- wheeled
- polishing apparatus
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Abstract
The utility model discloses wheeled both arms to turn over polishing apparatus, including the turn over throwing cylinder for material turn over throwing, described device includes the first support arm and the second support arm, first support arm and the second support arm are connected to the both ends of the turn over throwing cylinder axial direction, for supporting turn over throwing cylinder, and the motion of control turn over throwing cylinder.Compared with prior art, the beneficial effects of the utility model are：Wheeled both arms of the present utility model turn over polishing apparatus, are designed by the short roller of both arms, on the one hand solve the stability problem of single-arm roller, on the other hand it is driven using both arms, the stability of system is enhanced, improves system partial load, reduces system production cost and use cost.Cincture design solves the problems, such as in material that twister and material throw the problem of being accumulated on impeller turning over, and reduces the frequency of maintenance of equipment, and with roller flywheel energy storage structure each other, enhance the ability to work of system.
Description
Technical field
The utility model belongs to technical field of the electromechanical equipment, is related to the aerobic fermentation auxiliary equipment of the materials such as feces of livestock and poultry,
Polishing apparatus is turned over more particularly to a kind of wheeled both arms.
Background technology
Aerobic fermentation refer to people by vital movement of the microorganism under aerobic conditions come prepare microbial cells in itself or
The process of the direct metabolite of person or secondary metabolite.Usually said fermentation, refer to more organism for organic matter certain
Kind decomposable process.Fermentation is a kind of biochemical reaction that the mankind more early contact, nowadays in food industry, biological and chemical industry
In be widely used.It is also the basic process of bioengineering, i.e. Fermentation Engineering.
, can be to livestock and poultry farm and the cultivation waste material of other occasions, livestock and poultry by means of the aerobic fermentation process of microorganism
The materials such as excrement, mud carry out aerobic fermentation processing.Turn waste into wealth, obtain efficient organic waste materials, by original night soil-treatment
Burden conversion adds the profitability that cultivation place is managed, while further improve the ring in cultivation place for extra income
Border (deodorizing effect is obvious).
It is one of main equipment in existing aerobic fermentation to turn over polishing apparatus, is the chief component of aerobic fermentation system.
It is that will turn over throwing blade (section/blade) etc. to be arranged on rotatingcylindrical drum support that drum-type, which turns over polishing apparatus, is driven by power-equipment
Dynamic roller drives the blade (section/blade) around axially rolling selection, to carry out turning over throwing stirring to material.Conventional drum type turns over
Casting standby stirring turning device, at an angle, material is easy to be attached to during turning over throwing for contact of the blade with material in rotary course
On blade., will be due to the angle of the blade contact material of stirring turning device when the accumulation of material adhered on blade to certain degree
Change (surface of material really adhered to after material) cause to turn over that to throw effect bad, also result in system load and rise, enter
And system energy consumption is caused to increase；At the same time, the fault rate of system also quickly raises, and maintenance of equipment is ordinary.If conditions permit,
Existing solution is the material accumulated on regular manual cleaning blade, but is the increase in cost of labor, the practicality of equipment
Reduce.
If fibre object/the twister such as stalk, straw in material be present, or even the normal operation of equipment is influenced whether, directly
Connecing causes equipment fault.In fact, these fibre object/twisters are inevitably present in the material, in order to avoid by
The apparatus of load caused by fibre object/twister stops increases even failure, it usually needs increases the design power of equipment, equipment
Research and development and use cost be difficult to control, while still not solving the problems, such as winding.
In addition, existing turn over is cast for two groups of stirring turning devices are generally comprised, coaxial form is connected to the both sides of a support arm.
This structure is higher for the mechanical requirements of support arm, and when mechanical requirements reach to a certain degree, the cost of equipment can also climb rapidly
Rise, at the same time the fault rate of equipment is also corresponding higher.
Utility model content
The purpose of this utility model is that providing a kind of new wheeled both arms turns over polishing apparatus, for solving in background technology
There is twister in material, material throws the problems such as accumulation and roller are because of stability deficiency caused by single arm support on impeller turning over.
To achieve the above object, the utility model provides following technical scheme：A kind of wheeled both arms turn over polishing apparatus, including with
In the turn over throwing cylinder for material turn over throwing, it is characterised in that described device includes the first support arm and the second support arm, described
First support arm and the second support arm are connected to the both ends of the turn over throwing cylinder axial direction, for supporting turn over throwing cylinder, and control
The motion of turn over throwing cylinder processed.
Preferred scheme, including two groups turned over throwing impeller, described turn over throw the axial both ends that impeller is respectively arranged at turn over throwing cylinder
On circumference, described turn over throws impeller perpendicular to cylinder surface and forms angle α with cylinder axis；When the turn over throwing cylinder is with the shape that works
When state rotates, impeller to the force direction of material can Orthogonal Decomposition to roll circumference tangent line upward direction, and along cylinder axis
Point to the direction of another group of impeller.
Preferred scheme, the turn over throwing cylinder axial length 40cm-100cm.
Preferred scheme, described device include the first cincture and the second cincture, and the cincture is respectively arranged at support arm and is located at
The outside of turn over throwing cylinder axially-extending line, minimum range of the support arm to cincture close to the end face of support arm are not more than 5cm.
Preferred scheme, the power transmission shaft of the cincture is coaxial with the turn over throwing cylinder, and the cylinder of the cincture rotary work is empty
Between axial length be 3-12cm.
Preferred scheme, the cincture include blade, and the blade is formed perpendicular to turn over throwing cylinder surface and with cylinder axis
Angle β；When the cincture is rotated with working condition, cincture to the force direction of material can Orthogonal Decomposition cut to roll circumference
Line upward direction, and the opposite direction along cylinder axis another group of cincture of sensing.
Preferred scheme, the support arm sharpen side towards in the surface of cincture relative to the head-on edge of cincture rotation.
Preferred scheme, it is described to sharpen side to point to the knife edge structure that cincture rotates opposite direction.
Preferred scheme, first support arm and the second support arm are provided with transmission component synchronous each other, for inciting somebody to action
Active force is sent to turn over throwing cylinder.
Preferred scheme, the transmission component are chain drive component, include the multigroup chain and sprocket wheel of serial connection；It is described
Sprocket wheel is coaxial big minor sprocket, and chain is connected in series to form deceleration transmission with sprocket wheel.
Preferred scheme, the turn over throwing cylinder include the first sub- roller and the second sub- roller；The first sub- roller and second
Set first to turn over throwing impeller and second on sub- roller excircle respectively and turn over throwing impeller；First sub- roller and the second sub- roller are coaxial,
Between comprising width be L gap.
Preferred scheme, the width L in gap span：10cm≤L≤30cm.
Compared with prior art, the beneficial effects of the utility model are：Wheeled both arms of the present utility model turn over polishing apparatus, lead to
The short roller design of both arms is crossed, the stability problem of single-arm roller is on the one hand solved, is on the other hand driven using both arms, enhanced
The stability of system, system partial load is improved, reduce system production cost and use cost.Cincture design solves thing
Twister problem and material throw the problem of being accumulated on impeller turning in material, reduce the frequency of maintenance of equipment, and and roller
Flywheel energy storage structure each other, enhance the ability to work of system.
Brief description of the drawings
The wheeled both arms that Fig. 1 show single turn over throwing cylinder of the embodiment of the present invention turn over the structural representation of polishing apparatus；
Fig. 2 show the structural representation of the turn over throwing cylinder of the embodiment of the present invention；
The wheeled both arms that Fig. 3 show single turn over throwing cylinder of the embodiment of the present invention turn over the structural representation of polishing apparatus.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out
Clearly and completely describing, it is clear that described embodiment is only the utility model part of the embodiment, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made
The every other embodiment obtained, belong to the scope of the utility model protection.
Refer to Fig. 1-3：
A kind of wheeled both arms of the present embodiment turn over polishing apparatus, including for material turn over the turn over throwing cylinder 1 of throwing, it is described
Device includes the first support arm 2 and the second support arm 3, and first support arm and the second support arm, which are connected to, described turns over throwing
The both ends of roller axial direction, for supporting turn over throwing cylinder, and the motion of control turn over throwing cylinder.Corresponding thereto than prior art be,
By the coaxially connected two groups of stirring turning devices of a support arm for being arranged at centre.The advantages of this programme is, by two arms from two
The fixed turn over throwing cylinder in end, has been significantly greatly increased the balance quality of turn over throwing cylinder fixed structure, and equipment is more stable in use,
Fault rate reduces；Transmission component can reduce the transmission power of single group beam arm, can reduce into simultaneously by two groups of beam arm transmission
This, increases the durability of equipment, while two groups of transmissions are relatively independent, and adding the fault freedom of equipment, (single group drive failures are not
Influence equipment normal use)；The Structural Design Requirement of support arm is reduced.The motion of wherein support arm control turn over throwing cylinder includes
Turn over throwing cylinder move horizontally and translational speed (transfer turn over throw region), the vertical shift of turn over throwing cylinder and translational speed (change
Turn over cast material depth or lift or put down turn over throwing cylinder), the velocity of rotation of turn over throwing cylinder etc..
Preferred embodiment scheme, including two groups turned over and throw impeller 11, described turn over throw impeller and are respectively arranged at the axle of turn over throwing cylinder
To on the circumference at both ends, described turn over throws impeller perpendicular to cylinder surface and forms angle α with cylinder axis；When the turn over throwing cylinder
When being rotated with working condition, impeller to the force direction of material can Orthogonal Decomposition to roll circumference tangent line upward direction, and edge
Cylinder axis point to the direction of another group of impeller.Thrown it can be seen from Force decomposition of the impeller to material two groups by turning over and turned over throwing leaf
The throwing effect of turning over taken turns to material is from both sides to middle turning by material.So turn over benefit is, during material turning in roller
Between power-assisted it is smaller, reduce and turn over throwing resistance, at the same will not because of turn over throwing process to material pond side wall produce pressure, reduce material pond construction
Demand levels, protection material pond/reduce cost.
Preferred embodiment scheme, the turn over throwing cylinder axial length 40cm-100cm.Existing most of material ponds are sunk type
Rectangular parallelepiped structure, one section of cuboid material pond long side direction is feed zone/virgin material area, and the length for generally taking up material pond is 2m-5m
Left and right；The other end is discharge zone/clinker area.Turn over throwing cylinder turn over throwing process be using discharge zone as starting point, with zigzag progressively to
Virgin material area advance, carry out turning over throwings, after return discharge zone wait turn over throwing task next time.Drum length sets to realize and set
Standby miniaturization, due to being arranged at the interval range, the infrastructure cost of equipment reduces rapidly, and the fault rate of equipment is also quick therewith
Reduce, while equipment output improves with observable index, realizes substantially and minimizes non-maintaining demand.
Preferred embodiment scheme, described device includes the first cincture 4 and the second cincture 5, the cincture are respectively arranged at branch
Brace is located at the outside of turn over throwing cylinder axially-extending line, the support arm to cincture close to the end face of support arm minimum range not
More than 5cm.Preferred scheme is 2cm-3cm.The effect of this preferred embodiment essentially consists in：Cincture can connect first during throwing is turned over
Contact fibre object/twister in material, fibre object/twister in the material touched can turn with the rotation of cincture
It is dynamic, when fibre object turns to support arm, because the gap between cincture and support arm is smaller, easily fibre object is formed herein
Shearing so that long fibre object is cut off, and is accordingly greatly reduced to the obstruction of equipment.Meanwhile cincture due to contacting thing in advance
Material, pre- loosen is carried out to material and has been stirred, so in turn over throwing cylinder body contact material, resistance has reduced a lot.So
Under the premise of effect is thrown in same turning over, Dominant Facies have great lifting compared with prior art in terms of plant capacity and energy consumption.In addition,
After cincture is set, the utility model improvement project is compensate for because blocking for support arm causes stirring turning device can not be to close to material pond wall
Material turn over the deficiency of throwing.
Preferred embodiment scheme, the power transmission shaft of the cincture is coaxial with the turn over throwing cylinder, the cincture rotary work
Cylindrical space axial length is 3-12cm.Cincture length, which crosses conference, causes the load excessive of equipment, to the Cutting Drag of fibre object
Larger, cincture is too small, causes the pre- no effect of loosening.Within this range, length is optimal especially using 3cm-6cm.In addition, cincture
Also preferably consider to set varus blade, the varus blade realizes that equipment exists by setting the angle that blade contacts with material
Blade is advanced to the stirring turning device that is separated into of the active force of material in stirring turning device axial direction when moving left and right (along the width of material pond)
The opposite direction in direction.So set mainly solve the problems, such as be：Stirring turning device to material pond side wall during advancing, due to material
Transmission effect, larger pressure can be formed to side wall, if things go on like this, easily causes material pond along bad, or the construction to material pond
It is it is required that higher；It can largely eliminate to turn over by varus design and throw traveling process pressure to caused by material pond side wall.
Preferred embodiment scheme, the cincture include blade, and the blade is perpendicular to turn over throwing cylinder surface and and drum shaft
Line forms angle β；When the cincture is rotated with working condition, cincture to the force direction of material can Orthogonal Decomposition to roller
Tangent to periphery upward direction, and the opposite direction along cylinder axis another group of cincture of sensing.As can be seen that in cincture and turn over throwing cylinder
Anti- blade structure design (i.e. yawing moment is opposite) is taken at the adjacent angle of inclination for turning over throwing impeller, and so designing is advantageous in that
Material is avoided to be accumulated on the blade of cincture, increase uses the load of process.Maintenance cost can be largely reduced, is avoided
It is artificial daily to the cleaning and maintenance of heap buildup.
Preferred embodiment scheme, the support arm sharpen towards in the surface of cincture relative to the head-on edge of cincture rotation
Side.The setting main purpose for sharpening side is the effect that increase forms shearing to fibre object.Fibre object can effectively be cut off, avoided
The situation that apparatus of load is excessive or even equipment is stuck occurs.
Preferred embodiment scheme, it is described to sharpen side to point to the knife edge structure that cincture rotates opposite direction.Edge of a knife direction is exactly
The fibre object being attached on cincture rotates close direction, and effectively cutting can be formed to fibre object and is removed.
Preferred embodiment scheme, first support arm and the second support arm are provided with transmission component synchronous each other,
For active force to be sent into turn over throwing cylinder.Compared to the mode of original single armed transmission, which can be in same transimission power
Under the conditions of original heavy-duty chain substituted using lightweight chain, reduce the requirement to chain, increase the durability of equipment.It is synchronous to pass
Another benefit passed is, when single armed driving chain breaks down (fracture), still can to ensure by another chain drive
Equipment normal use in a short time.
Preferred embodiment scheme, the transmission component are chain drive component, include the multigroup chain 6 and chain of serial connection
Wheel 7；The sprocket wheel is coaxial big minor sprocket, and chain is connected in series to form deceleration transmission with sprocket wheel.Deceleration transmission can substitute original
Reductor necessary to having system, weight of equipment is reduced, while can further optimize chain matching (high-speed chain and high-power
The position of chain).
Preferred embodiment scheme, the turn over throwing cylinder include the first sub- roller and the second sub- roller；The first sub- roller
Throwing impeller is turned over setting first to turn over throwing impeller and second on the second sub- roller excircle respectively；First sub- roller and the second sub- roller
It is coaxial, between comprising width be L gap.Original single turn over throwing cylinder is relatively independent for two on the surface after setting gap
Roller, inertia energy storage structure each other between the roller.Middle gap provides interim middle unloading to turn over the material for throwing
Space is stored up, the space resistance is smaller, can reduce the spindle motor power of equipment to a certain extent, while do not interfere with and turn over
Throw speed and other effects.
Preferred embodiment scheme, the width L in gap span：10cm≤L≤30cm.Rational gap is for optimization
The energy consumption power of product has positive role.
In the description of embodiment of the present utility model, it is to be understood that term " on ", " under ", "front", "rear",
"left", "right", " hard straight ", " level ", " " center ", " top ", " bottom ", " top ", " root ", " interior ", " outer ", " periphery ", " inner
The orientation or position relationship of the instruction such as side ", " inner side ", " outside " be based on orientation shown in the drawings or position relationship, be only for
Make to describe in description the utility model and simplifying, rather than instruction or imply signified device or element must have it is specific
Orientation, with specific azimuth configuration and operation, therefore it is not intended that to limitation of the present utility model.Wherein, " inboard " refers to
Region or space internal or fence up." periphery " refers to the region around certain particular elements or specific region.
In the description of embodiment of the present utility model, term " first ", " second ", " the 3rd ", " the 4th " are only used for retouching
Purpose is stated, and it is not intended that instruction or hint relative importance or the implicit quantity for indicating indicated technical characteristic.By
This, defines " first ", " second ", " the 3rd ", the feature of " the 4th " can be expressed or implicitly include one or more
Individual this feature.In description of the present utility model, unless otherwise indicated, " multiple " are meant that two or more.
, it is necessary to illustrate in the description of embodiment of the present utility model, unless otherwise clearly defined and limited, art
Language " installation ", " connected ", " connection ", " assembling " should be interpreted broadly, for example, it may be being fixedly connected or detachably
Connection, or be integrally connected；Can be joined directly together, can also be indirectly connected by intermediary, can be in two elements
The connection in portion.For the ordinary skill in the art, it can understand above-mentioned term in the utility model with concrete condition
Concrete meaning.
In the description of embodiment of the present utility model, specific features, structure, material or feature can be any one
Combined in an appropriate manner in individual or multiple embodiments or example.
In the description of embodiment of the present utility model, it is to be understood that "-" and "~" represent be two values it
Same scope, and the scope includes end points.Such as:" A-B " represents to be more than or equal to A, and the scope less than or equal to B.“A
~B " represents to be more than or equal to A, and the scope less than or equal to B.
The terms "and/or", it is only a kind of description affiliated partner in the description of embodiment of the present utility model
Incidence relation, expression there may be three kinds of relations, for example, A and/or B, can be represented：Individualism A, while A and B be present,
These three situations of individualism B.In addition, character "/" herein, it is a kind of relation of "or" to typically represent forward-backward correlation object.
While there has been shown and described that embodiment of the present utility model, for the ordinary skill in the art,
It is appreciated that these embodiments can be carried out with a variety of changes in the case where not departing from principle of the present utility model and spirit, repaiied
Change, replace and modification, the scope of the utility model are defined by the appended claims and the equivalents thereof.
Claims (10)
1. wheeled both arms turn over polishing apparatus, including for material turn over the turn over throwing cylinder of throwing, it is characterised in that described device bag
The first support arm and the second support arm are included, first support arm and the second support arm are connected to the turn over throwing cylinder axial direction
Both ends, for supporting turn over throwing cylinder, and the motion of control turn over throwing cylinder.
2. wheeled both arms according to claim 1 turn over polishing apparatus, it is characterised in that throwing impeller is turned over including two groups, it is described to turn over
Throw impeller to be respectively arranged on the circumference at axial both ends of turn over throwing cylinder, described turn over throws impeller perpendicular to cylinder surface and and roller
Axis forms angle α；When the turn over throwing cylinder is rotated with working condition, impeller can Orthogonal Decomposition to the force direction of material
To roll circumference tangent line upward direction, and the direction along cylinder axis another group of impeller of sensing.
3. wheeled both arms according to claim 1 or 2 turn over polishing apparatus, it is characterised in that the turn over throwing cylinder axial length
40cm-100cm。
4. wheeled both arms according to claim 1 or 2 turn over polishing apparatus, it is characterised in that described device includes the first cincture
With the second cincture, the cincture is respectively arranged at the outside that support arm is located at turn over throwing cylinder axially-extending line, and the support arm arrives
Minimum range of the cincture close to the end face of support arm is not more than 5cm.
5. wheeled both arms according to claim 4 turn over polishing apparatus, it is characterised in that the power transmission shaft of the cincture turns over described
Throwing roller is coaxial, and the cylindrical space axial length of the cincture rotary work is 3-12cm.
6. wheeled both arms according to claim 5 turn over polishing apparatus, it is characterised in that the cincture includes blade, the leaf
Piece forms angle β perpendicular to turn over throwing cylinder surface and with cylinder axis；When the cincture is rotated with working condition, cincture is to thing
The force direction of material can Orthogonal Decomposition point to the anti-of another group of cincture to roll circumference tangent line upward direction, and along cylinder axis
Direction.
7. wheeled both arms according to claim 6 turn over polishing apparatus, it is characterised in that the support arm is towards the surface of cincture
In relative to cincture rotation head-on edge for sharpen side.
8. wheeled both arms according to claim 7 turn over polishing apparatus, it is characterised in that the sharpening side rotates to point to cincture
The knife edge structure of opposite direction.
9. wheeled both arms according to claim 1 or 2 turn over polishing apparatus, it is characterised in that first support arm and second
Support arm is provided with transmission component synchronous each other, for active force to be sent into turn over throwing cylinder.
10. wheeled both arms according to claim 9 turn over polishing apparatus, it is characterised in that the transmission component is chain drive
Component, include the multigroup chain and sprocket wheel of serial connection；The sprocket wheel is coaxial big minor sprocket, chain and sprocket wheel serial connection shape
Into deceleration transmission.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720803066.3U CN206872809U (en) | 2017-07-05 | 2017-07-05 | Wheeled both arms turn over polishing apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720803066.3U CN206872809U (en) | 2017-07-05 | 2017-07-05 | Wheeled both arms turn over polishing apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206872809U true CN206872809U (en) | 2018-01-12 |
Family
ID=61332154
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720803066.3U Active CN206872809U (en) | 2017-07-05 | 2017-07-05 | Wheeled both arms turn over polishing apparatus |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107216990A (en) * | 2017-07-05 | 2017-09-29 | 眉山市科跃工业自动化设备有限公司 | A kind of wheeled both arms turn over polishing apparatus |
| CN108060062A (en) * | 2018-01-23 | 2018-05-22 | 四川中禾高科农牧设备科技有限公司 | A kind of turn over throwing cylinder and turn over polishing apparatus |
| CN112608196A (en) * | 2020-12-18 | 2021-04-06 | 重庆市放歌农业科技有限公司 | Method for preparing microbial compound organic fertilizer by using livestock and poultry manure residues |
| CN112608197A (en) * | 2020-12-18 | 2021-04-06 | 重庆市放歌农业科技有限公司 | Method for preparing microbial compound organic fertilizer by using domestic sludge |
| CN113247542A (en) * | 2021-05-21 | 2021-08-13 | 眉山市科跃工业自动化设备有限公司 | Bucket-lifting type excrement conveying device |
-
2017
- 2017-07-05 CN CN201720803066.3U patent/CN206872809U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107216990A (en) * | 2017-07-05 | 2017-09-29 | 眉山市科跃工业自动化设备有限公司 | A kind of wheeled both arms turn over polishing apparatus |
| CN107216990B (en) * | 2017-07-05 | 2023-11-10 | 眉山市科跃工业自动化设备有限公司 | Wheel type double-arm turning and throwing device |
| CN108060062A (en) * | 2018-01-23 | 2018-05-22 | 四川中禾高科农牧设备科技有限公司 | A kind of turn over throwing cylinder and turn over polishing apparatus |
| CN112608196A (en) * | 2020-12-18 | 2021-04-06 | 重庆市放歌农业科技有限公司 | Method for preparing microbial compound organic fertilizer by using livestock and poultry manure residues |
| CN112608197A (en) * | 2020-12-18 | 2021-04-06 | 重庆市放歌农业科技有限公司 | Method for preparing microbial compound organic fertilizer by using domestic sludge |
| CN113247542A (en) * | 2021-05-21 | 2021-08-13 | 眉山市科跃工业自动化设备有限公司 | Bucket-lifting type excrement conveying device |
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