CN117798052B - Humic acid raw materials screening processing apparatus - Google Patents
Humic acid raw materials screening processing apparatus Download PDFInfo
- Publication number
- CN117798052B CN117798052B CN202410231483.XA CN202410231483A CN117798052B CN 117798052 B CN117798052 B CN 117798052B CN 202410231483 A CN202410231483 A CN 202410231483A CN 117798052 B CN117798052 B CN 117798052B
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- China
- Prior art keywords
- screening
- frame
- humic acid
- raw materials
- transmission
- Prior art date
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Links
- 238000012216 screening Methods 0.000 title claims abstract description 61
- 239000002994 raw material Substances 0.000 title claims abstract description 50
- QJZYHAIUNVAGQP-UHFFFAOYSA-N 3-nitrobicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid Chemical compound C1C2C=CC1C(C(=O)O)C2(C(O)=O)[N+]([O-])=O QJZYHAIUNVAGQP-UHFFFAOYSA-N 0.000 title claims abstract description 44
- 239000004021 humic acid Substances 0.000 title claims abstract description 44
- 238000012545 processing Methods 0.000 title claims description 5
- 230000007246 mechanism Effects 0.000 claims abstract description 41
- 230000005540 biological transmission Effects 0.000 claims abstract description 39
- 238000004519 manufacturing process Methods 0.000 claims abstract description 12
- 239000004744 fabric Substances 0.000 claims abstract description 10
- 238000011282 treatment Methods 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims description 20
- 239000003245 coal Substances 0.000 abstract description 18
- 239000000843 powder Substances 0.000 abstract description 17
- 239000011435 rock Substances 0.000 abstract description 13
- 238000000034 method Methods 0.000 abstract description 12
- 230000000694 effects Effects 0.000 abstract description 6
- 239000003818 cinder Substances 0.000 abstract description 4
- 230000008569 process Effects 0.000 description 6
- 239000003077 lignite Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- PUKLDDOGISCFCP-JSQCKWNTSA-N 21-Deoxycortisone Chemical compound C1CC2=CC(=O)CC[C@]2(C)[C@@H]2[C@@H]1[C@@H]1CC[C@@](C(=O)C)(O)[C@@]1(C)CC2=O PUKLDDOGISCFCP-JSQCKWNTSA-N 0.000 description 1
- FCYKAQOGGFGCMD-UHFFFAOYSA-N Fulvic acid Natural products O1C2=CC(O)=C(O)C(C(O)=O)=C2C(=O)C2=C1CC(C)(O)OC2 FCYKAQOGGFGCMD-UHFFFAOYSA-N 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 238000001994 activation Methods 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 229940095100 fulvic acid Drugs 0.000 description 1
- 239000002509 fulvic acid Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003895 organic fertilizer Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000003415 peat Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/18—Drum screens
- B07B1/22—Revolving drums
- B07B1/24—Revolving drums with fixed or moving interior agitators
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/42—Drive mechanisms, regulating or controlling devices, or balancing devices, specially adapted for screens
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
Landscapes
- Combined Means For Separation Of Solids (AREA)
Abstract
The invention relates to the technical field of humic acid production, in particular to a humic acid production raw material screening treatment device which comprises a supporting mechanism, wherein a power mechanism is arranged on the supporting mechanism, and the power mechanism is in transmission connection with a screening mechanism; the supporting mechanism comprises a frame, and a first driving wheel is arranged on the frame; the screening mechanism comprises a screening component, and an auxiliary component is movably connected to the screening component. The advantages are that: through setting up screening mechanism, at the in-process to the raw materials screening, can get up the humic acid raw materials powder that adheres to on rock, gangue or the coal cinder in the raw materials, simultaneously, break up the humic acid raw materials powder that the caking gathers, improved screening effect, because guide strip spiral structure, when rock, gangue or the coal cinder in the raw materials and the striking of guide strip, can give the vibration of guide strip axial, the guide strip of axial vibration moves screen cloth together vibration, accelerates the screening to the raw materials on the screen cloth, thereby improved the efficiency of screening.
Description
Technical Field
The invention relates to the technical field of humic acid production, in particular to a humic acid production raw material screening treatment device.
Background
Humic acid is a type of organic substance that is caused and accumulated by a series of processes of decomposition and transformation of animal and plant remains (mainly remains of plants) by microorganisms, and geochemistry. Is widely applied to various fields such as agriculture, forestry, pasture, petroleum, chemical industry, building materials, medicine and health, environmental protection, and the like.
Some coals with low calorific value, such as peat, lignite and weathered coal, have humic acid content of 10-80%, and the weathered coal or lignite resources are utilized to obtain high-activity humic acid (fulvic acid) through degradation, extraction, activation and other treatments. In the process of processing humic acid, if the content of humic acid in raw materials (lignite or weathered coal) is higher, the raw materials can be directly ground into powder and then used as production raw materials of high-activity humic acid for treatment, and if the content of humic acid is too low, the humic acid is enriched by screening methods (large-particle rocks, gangue and coal blocks are screened out) and other methods so as to improve the content of humic acid. When the screening method is used for enriching humic acid, a screening device is needed.
The utility model discloses a tertiary screening plant for producing humic acid fertilizer in chinese patent publication No. CN209424024U, including first support, first support left side is equipped with the second support, and the second support is adjacent with first support, and the top of first support is equipped with the roof, and roof and first support and second support welding link to each other, the top of second support is equipped with first frame and second frame, and first frame and second frame respectively with second support welding link to each other, and the top of first frame is equipped with the motor, and the motor articulates with first frame and links to each other, and motor and external power source electric connection.
However, compared with the prior art and the comparison scheme, the three-stage screening device for producing the humic acid organic fertilizer has the following problems in the actual use process:
In the process of screening humic acid raw materials (weathered coal or lignite), the humic acid raw materials enter from one end of a rotary screen, rocks, gangue or coal blocks and the like blocked by the rotary screen are adhered to the surface of the humic acid raw material powder (the humic acid raw material powder has strong hygroscopicity and is easy to agglomerate or adhere) in the process of rolling in the rotary screen, so that the partially agglomerated humic acid raw material powder and the humic acid raw material powder adhered to the rocks, gangue or coal blocks are treated together with the screened rocks, gangue or coal blocks and the like, the waste of the partially humic acid raw material powder is caused, and the screening effect of the humic acid raw material powder is affected.
Therefore, the application provides a humic acid production raw material screening treatment device to solve the problems.
Disclosure of Invention
The object of the present invention is to solve at least one of the technical drawbacks.
The invention aims to overcome the defects of the prior art, solve the problems in the background art and provide a humic acid production raw material screening treatment device.
The aim of the invention is achieved by the following technical scheme: the humic acid production raw material screening treatment device comprises a supporting mechanism, wherein a power mechanism is arranged on the supporting mechanism, and a screening mechanism is connected to the power mechanism in a transmission way;
the supporting mechanism comprises a frame, and a first driving wheel is arranged on the frame;
the screening mechanism comprises a screening component, an auxiliary component is movably connected to the screening component, and the auxiliary component is in transmission connection with the screening component through a first transmission wheel;
The screening component comprises two connecting pipes, a plurality of spiral material guiding strips are arranged in the two connecting pipes, the two connecting pipes are fixedly connected through the material guiding strips, a plurality of annular screens are arranged on the material guiding strips, and a first toothed ring is fixedly connected to one of the connecting pipes;
The auxiliary assembly comprises a connecting frame, a pipe ring is fixedly connected to the connecting frame, bristles are arranged in the pipe ring, a second toothed ring is fixedly connected to one end of the connecting frame, and connecting grooves are formed in two ends of the pipe ring.
Preferably, one side at the top of the frame is provided with a feeding groove, the frame is provided with a discharging groove, one side of the frame is fixedly provided with a connecting rod through a bolt, and the first driving wheel is rotationally connected to one end of the connecting rod, which is far away from the frame.
Preferably, the power mechanism comprises a driving piece, the driving piece is fixedly arranged on the frame, a transmission assembly is arranged at the output end of the driving piece, and the driving piece is connected with a second transmission wheel through the transmission assembly.
Preferably, the connecting pipe is in transmission connection with the second driving wheel.
Preferably, the plurality of screens are uniformly distributed between the two connecting pipes.
Preferably, the number of the pipe rings is a plurality of, and the pipe rings are uniformly distributed on the connecting frame.
Preferably, the plurality of tube rings and the plurality of screens are staggered.
Preferably, the positions of the material guiding strips corresponding to the bristles are provided with grooves for the bristles to pass through.
Preferably, the second toothed ring is in driving connection with the first toothed ring via a first driving wheel.
Preferably, the screen cloth passes through spread groove and collar swing joint, and the screen cloth is located the inside one end of spread groove and is provided with the spacing ring, and spacing ring swing joint is in the inside of spread groove.
Compared with the prior art, the method has the following advantages:
This humic acid production raw materials screening processing apparatus, through setting up screening mechanism, at the in-process to the raw materials screening, can get up the humic acid raw materials powder that adheres to on rock, gangue or the coal cinder in the raw materials, simultaneously, break up the humic acid raw materials powder that the caking gathers, improved screening effect, because guide strip spiral structure, when rock, gangue or the coal cinder in the raw materials and the striking of guide strip, can give guide strip axial ascending vibration, the guide strip of axial vibration moves the screen cloth and vibrates together, the screening to the raw materials on the screen cloth is accelerated, thereby the efficiency of screening has been improved.
None of the parts of the device are the same as or can be implemented using prior art.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic view of the structure of the supporting mechanism of the present invention;
FIG. 3 is a schematic diagram of a power mechanism according to the present invention;
FIG. 4 is a schematic cross-sectional view of the screening mechanism of the present invention;
FIG. 5 is a schematic view of the screening mechanism of the present invention;
Fig. 6 is a schematic view of a screen assembly of the present invention from a first perspective;
Fig. 7 is a schematic view of a screen assembly of the present invention from a second perspective;
FIG. 8 is a schematic view of the auxiliary assembly of the present invention;
FIG. 9 is an enlarged schematic view of the structure of FIG. 8A in accordance with the present invention;
FIG. 10 is an enlarged schematic view of a partial cross-sectional structure of the junction of the screen and collar of the present invention.
In the figure: 1. a support mechanism; 101. a frame; 102. feeding a trough; 103. discharging groove; 104. a connecting rod; 105. a first driving wheel; 2. a power mechanism; 21. a driving member; 22. a transmission assembly; 221. a gear steering; 222. a reversing coupler; 223. a transmission shaft; 23. a second driving wheel; 3. a screening mechanism; 31. a screen assembly; 311. a connecting pipe; 312. a material guiding strip; 313. a screen; 314. a first toothed ring; 32. an auxiliary component; 321. a connecting frame; 322. a pipe ring; 323. brushing; 324. a second toothed ring; 325. and a connecting groove.
Detailed Description
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art in a specific case.
Additional aspects and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
As shown in figure 1, the humic acid production raw material screening treatment device comprises a supporting mechanism 1, wherein a power mechanism 2 is arranged on the supporting mechanism 1, and a screening mechanism 3 is connected to the power mechanism 2 in a transmission manner.
As shown in fig. 2, the supporting mechanism 1 comprises a frame 101, an upper trough 102, a lower trough 103, a connecting rod 104 and a first driving wheel 105, wherein the upper trough 102 is arranged on one side of the top of the frame 101, the lower trough 103 is arranged on the frame 101, the connecting rod 104 is fixedly arranged on one side of the frame 101 through bolts, and one end, far away from the frame 101, of the connecting rod 104 is rotatably connected with the first driving wheel 105.
As shown in fig. 1 and 3, the power mechanism 2 includes a driving member 21, a transmission assembly 22 and a second transmission wheel 23, the driving member 21 is fixedly mounted on the frame 101, the output end of the driving member 21 is provided with the transmission assembly 22, the driving member 21 is connected with the second transmission wheel 23 through the transmission assembly 22, in this embodiment, the transmission assembly 22 includes a gear steering device 221, a reversing coupler 222 and a transmission shaft 223, the gear steering device 221 is disposed at the output end of the driving member 21, one end of the gear steering device 221 far away from the driving member 21 is provided with the reversing coupler 222, one end of the reversing coupler 222 far away from the gear steering device 221 is provided with the transmission shaft 223, and the second transmission wheel 23 is disposed on the transmission shaft 223.
As shown in fig. 1,4 and 5, the screening mechanism 3 comprises a screening assembly 31 and an auxiliary assembly 32, the screening assembly 31 is movably connected with the auxiliary assembly 32, the screening assembly 31 is in transmission connection with the second transmission wheel 23, and the auxiliary assembly 32 is in transmission connection with the screening assembly 31 through the first transmission wheel 105.
As shown in fig. 1,6 and 7, the screening assembly 31 includes a connecting pipe 311, a material guiding strip 312, a screen 313 and a first toothed ring 314, the connecting pipe 311 is in transmission connection with the second driving wheel 23, the number of the connecting pipes 311 is two, a plurality of spiral material guiding strips 312 are arranged in the two connecting pipes 311, the two connecting pipes 311 are fixedly connected through the material guiding strips 312, a plurality of annular screen 313 are arranged on the material guiding strips 312, the plurality of screen 313 are uniformly distributed between the two connecting pipes 311, and the first toothed ring 314 is fixedly connected on one of the connecting pipes 311.
As shown in fig. 5, 8 and 9, the auxiliary assembly 32 comprises a connecting frame 321, a pipe ring 322, bristles 323, a second toothed ring 324 and a connecting groove 325, the pipe ring 322 is fixedly connected to the connecting frame 321, the pipe rings 322 are multiple in number and uniformly distributed on the connecting frame 321, the bristles 323 are arranged in the pipe ring 322, grooves for the bristles 323 to pass through are formed in positions, corresponding to the bristles 323, of the guide bars 312, one end of the connecting frame 321 is fixedly connected with the second toothed ring 324, the second toothed ring 324 is in transmission connection with the first toothed ring 314 through the first transmission wheel 105, connecting grooves 325 are formed in two ends of the pipe ring 322, as shown in fig. 4, 5 and 10, the pipe rings 322 and the screen cloth 313 are distributed in a staggered mode, the screen cloth 313 is movably connected with the pipe ring 322 through the connecting groove 325, a limiting ring is arranged at one end, located in the connecting groove 325, of the limiting ring is movably connected with the connecting groove 325.
The working process is as follows:
S1, when the screening device is used, raw materials (lignite or weathered coal) to be screened are added into a screening mechanism 3 from a feeding groove 102, a driving piece 21 is started, the driving piece 21 drives a second driving wheel 23 to rotate through a transmission assembly 22, the second driving wheel 23 drives a connecting pipe 311 to rotate, the connecting pipe 311 drives a screen 313 to rotate through a material guiding strip 312, and the raw materials are screened;
S2, simultaneously, the connecting pipe 311 drives the first driving wheel 105 to rotate through the first toothed ring 314, the first driving wheel 105 drives the connecting frame 321 and the screen 313 to reversely rotate through the second toothed ring 324, and the connecting frame 321 drives the pipe ring 322 and the screen 313 to reversely rotate;
S3, when the raw materials reach the screen 313, the screen 313 screens the raw materials, humic acid raw material powder in the raw materials falls from the screen 313 and falls into the blanking groove 103, and impurities such as rocks, gangue or coal blocks in the raw materials and the humic acid raw material powder agglomerated and piled are pushed by the rotating spiral material guide strip 312;
s4, when the impurities such as rocks, gangue or coal blocks in the raw materials and the humic acid raw material powder agglomerated and piled up are moved to the pipe ring 322, the pipe ring 322 which rotates reversely cleans the humic acid raw material powder attached to the rocks, gangue or coal blocks in the raw materials through the inner bristles 323;
S5, simultaneously, rocks, gangue or coal blocks on the pipe ring 322 collide with the caked and piled humic acid raw material powder and the guide bars 312 which move oppositely, and the caked and piled humic acid raw material powder is scattered by the opposite collision of the guide bars 312, so that the screening effect is improved;
S6, due to the spiral structure of the material guiding strip 312, when rocks, gangue or coal blocks collide with the material guiding strip 312, axial vibration is given to the material guiding strip 312, the material guiding strip 312 vibrating axially drives the screen 313 to vibrate together (at this time, the limiting ring can prevent the joint of the screen 313 and the pipe ring 322 from separating from the connecting groove 325), and screening of raw materials on the screen 313 is accelerated, so that screening efficiency is improved.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims.
Claims (3)
1. A humic acid raw materials screening processing apparatus, its characterized in that: the screening device comprises a supporting mechanism, wherein a power mechanism is arranged on the supporting mechanism, and a screening mechanism is connected to the power mechanism in a transmission way;
the supporting mechanism comprises a frame, and a first driving wheel is arranged on the frame;
The screening mechanism comprises a screening component, an auxiliary component is movably connected to the screening component, and the auxiliary component is in transmission connection with the screening component through the first transmission wheel;
The screening component comprises two connecting pipes, a plurality of spiral material guiding strips are arranged in the two connecting pipes, the two connecting pipes are fixedly connected through the material guiding strips, a plurality of annular screens are arranged on the material guiding strips, and a first toothed ring is fixedly connected to one of the connecting pipes;
The auxiliary assembly comprises a connecting frame, a pipe ring is fixedly connected to the connecting frame, bristles are arranged in the pipe ring, one end of the connecting frame is fixedly connected with a second toothed ring, and connecting grooves are formed in two ends of the pipe ring;
The power mechanism comprises a driving piece, the driving piece is fixedly arranged on the frame, a transmission assembly is arranged at the output end of the driving piece, and the driving piece is in transmission connection with a second transmission wheel through the transmission assembly;
the connecting pipe is in transmission connection with the second driving wheel;
the plurality of screens are uniformly distributed between the two connecting pipes;
The number of the pipe rings is multiple, and the pipe rings are uniformly distributed on the connecting frame;
the pipe rings and the screens are distributed in a staggered manner;
The second toothed ring is in transmission connection with the first toothed ring through the first transmission wheel;
The screen cloth pass through the spread groove with collar swing joint, the screen cloth is located the inside one end of spread groove is provided with the spacing ring, and spacing ring swing joint is in the inside of spread groove.
2. The humic acid production raw material screening treatment device according to claim 1, wherein: one side at frame top is provided with the material loading groove, be provided with down the silo in the frame, one side of frame is through bolt fixed mounting has the connecting rod, first drive wheel rotation is connected the one end that the connecting rod kept away from the frame.
3. The humic acid production raw material screening treatment device according to claim 1, wherein: grooves for the bristles to pass through are formed in positions, corresponding to the bristles, of the material guide strips.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410231483.XA CN117798052B (en) | 2024-03-01 | 2024-03-01 | Humic acid raw materials screening processing apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410231483.XA CN117798052B (en) | 2024-03-01 | 2024-03-01 | Humic acid raw materials screening processing apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN117798052A CN117798052A (en) | 2024-04-02 |
| CN117798052B true CN117798052B (en) | 2024-05-03 |
Family
ID=90430521
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410231483.XA Active CN117798052B (en) | 2024-03-01 | 2024-03-01 | Humic acid raw materials screening processing apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117798052B (en) |
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| US7273150B2 (en) * | 2003-12-29 | 2007-09-25 | Wildcat Manufacturing Co., Inc. | Portable screening machine |
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