CN201781855U - Adjustable large yellow croakers grading device - Google Patents

Abstract

An adjustable large yellow croakers grading device comprises a net cage, a fish pump and a grading box, wherein the net cage is connected with the fish pump; the fish pump is connected with the grading box; the grading box adopts a groove-shaped structure formed by frames; the frames include an upper frame and lower frames; a mesh sheet is arranged between the lower frames; mesh sheets and a grading fence are arranged among the upper frame and the lower frames; the grading fence includes a plurality of fence bars with irregular polygonal sections; a transmission device arranged on the upper frame drives the grading fence to rotate, and comprises gears and a chain; a bearing driving the grading fence to rotate is arranged on the lower frame, and is connected with a motor; centre cylinders are arranged in the fence bars; the top of each centre cylinder is connected with a gear; the bottom of the centre cylinder is connected with the bearing to drive the fence bar to rotate; and each gear is connected with a dial scale used for adjusting and controlling the space between the fence bars. The adjustable grading device can be used for performing multi-level adjust and control grading on large yellow croakers according to the requirement of a farm, so as to save labor force, and reduce error caused by manual visual estimation and death rate of the large yellow croakers caused by weighting the large yellow croakers with a steelyard.

Description

Adjustable large yellow Crocker grading plant

Technical field

The utility model relates to aquaculture technology, is specifically related to a kind of adjustable large yellow Crocker grading plant, the Fisheries Science field.

Background technology

Large yellow Crocker inhabits depth of water 60m with lower floor in the interior coastal waters for warm warm nature mass migration fish.Detest high light, the happiness turbidity current.Float when dawn, dusk or spring tide more; Sink when daytime or neap.During reproduction, the shoal of fish survives the winter from the off-lying sea to distinguish in batches and does breeding migration to the coastal waters.Large yellow Crocker once was one of most important seafood fish of China, mainly was distributed in the bank in China coastal waters, North gets southern Yellow Sea, through the East Sea, the Taiwan Straits, reached coastal to the east of the Lezhou Peninsula, the South Sea in the south, and distribution is all arranged.Therefore, " the state fish " that is called as China.

Before nineteen seventies, large yellow Crocker produces to have tangible fishing ground and pre-season, and East Sea district fishes in the highest year can make a call to 2 * 10 ⁵T.But after the seventies, population quantity descends year by year, and to late nineteen eighties the early 1990s, output only is about 2000t, to have only (1974 19.61 * 10 the highest time ⁴T) 1%.Produces and can not form the fishing ground fishing season, and catch mostly is juvenile fish, adult fish quantity seldom, and the domestic and international market demand ceaselessly increases, and makes large yellow Crocker become famous and precious seafood fish, the market price climbs up and up.Middle nineteen nineties, large yellow Crocker is cultured and has broken through bait and technical barrier, and has obtained developing rapidly, thereby the demand of fry is heightened, and has promoted the development of large yellow Crocker seedling growing process.Research to large yellow Crocker at present is confined to the cultural technique aspect substantially, mainly concentrate on the research of the aspect such as seedling growing process, fish disease prevention and cure, feed research and development of large yellow Crocker, and fish for aspect the classification large yellow Crocker, especially now the large yellow Crocker resource of natural water area is near under the exhausted present situation, and it is very few at home that net cage works the technical research of catching classification large yellow Crocker aspect.It is very traditional that present net cage works the method for catching large yellow Crocker, all rely on manual operations, before this etting was come up from water lira, come " choosing " fish with a dab net then, eyes with the workpeople come large yellow Crocker is carried out classification, individual bigger fish one tail one tail in the net cage is chosen, separately cultured then or come into the market.The problem theme that this method exists has:

1. efficient is low

According to statistics, as adopt artificial hauling and hand picking classification large yellow Crocker, that fishes for the 1000 tail large yellow Crocker that meet listing, need spend 1～2 hour at least, the cost height.Simultaneously artificial classification subjectivity factor is big, and effectiveness of classification is low, and the less fish of body weight does not account for price advantage on market, cause economic loss.

2. cause fish death

Large yellow Crocker is a kind of easily dead fingerling, and the fish body damages and is exposed to and all is easy to occur large yellow Crocker death in the air.Artificial classification needs a large amount of time, when also just having caused classification large yellow Crocker the quite a while will be arranged is water state, and with the diddle-net large yellow Crocker is picked up from net cage, be reentered into net cage after having selected, whole process to experience drive, draw in the net clothing, rise and to catch diddle-net, manual weighing's supervisor, fish body concussion scratch all might appear in each process, and scale comes off, and makes that large yellow Crocker fish body is weak even dead.

3. existing grading plant classification dimensions is fixed, and is unadjustable

According to research experiments such as Lu Wei, the grading plant of employing is to tie up pvc pipe with rope to form, and it is numerous and diverse to do manual work.During use the etting pull-up of net cage bottom is fixed, used the back dismounting and also will operate equally, workload is big.

4. existing grading plant attractive effect is relatively poor, and grading time is long

Though adopt existing stage division that the damage of fish is not almost had, inefficiency will be by continuous stirring seawater, pull scaring such as the etting shoal of fish, reaches the classification purpose, and the time of a net cage of classification is about 1 hour, and the classification rate is not high.

5. existing grading plant is difficult in maintenance, and expense is higher

Existing grading plant adopts fixed structure, and plant needs to prepare the grading plant of three corresponding specification in order to screen 300g, 400 and the large yellow Crocker of three specifications of 500g, takies huge space.Simultaneously owing to adopt fixation binding formula structure, need remove whole grading plant and change pvc pipe when one of them fracture occurs, the required manpower and materials of regular maintenance are higher.

The utility model content

The purpose of this utility model is large yellow Crocker to be carried out classification handle, and the poor efficiency that produces when solving now artificial classification, problem such as expensive are a kind of practical devices, can be to the large yellow Crocker high-effective classifying.A small amount of classification grid are also arranged at present in test with use, but the classification spacing of these grading plants all fix, can only be at the long fish of particular volume, and make trouble, be difficult for promoting.So according to this shortcoming, we have designed the classification grid of adjustable distance, calculate and actual test by theory, large yellow Crocker has been divided into 4 intervals, be respectively less than 300g, 300～400g, 400g～500g and (reference table 1) more than the 500g.

Owing to need a large amount of labours when manually fishing for large yellow Crocker, and to the certain damage of large yellow Crocker generation, make the death of part large yellow Crocker, influence continues to culture or market sale, so in conjunction with existing widely used aboard ship fishpump, large yellow Crocker is drawn the back directly inject the classification case from net cage, large yellow Crocker is carried out classification, improve effectiveness of classification and efficient by the classification grid.

The classification grid can be adjusted spacing according to demand, reach the purpose of separating different big small fish bodies, mainly contain three states: as Fig. 1, the spacing of a state two classification grid is 40mm, large yellow Crocker at 500g, extract lock, rotate the dial above the classification case then, arriving scale is the position of 400g, decontrol lock, at this moment lock can snap in the space of the inside automatically, makes classification grid fixed interval motionless (as Fig. 1 and Fig. 4), and this state is the large yellow Crocker at 400g.In like manner, rotate to same direction once more and can arrive Fig. 3 c state, at the large yellow Crocker of 300g.

The technical problem of the required solution of the utility model can be achieved through the following technical solutions:

A kind of adjustable large yellow Crocker grading plant comprises net cage, fishpump and classification case, and described net cage is connected with fishpump, and described fishpump is connected with the classification case,

It is characterized in that described classification case surrounds trench structure by framework, described framework comprises upper frame and underframe, is provided with the net sheet between the described underframe, and net sheet and classification grid are set between described underframe and the upper frame; Described classification grid comprise complex root grid bar composition, and the cross section of described grid bar is irregular polygon,

Described upper frame is provided with and drives the transmission device that the classification grid rotate, and described transmission device comprises gear and chain;

Described underframe is provided with and drives the bearing that the classification grid rotate, and described bearing is connected with motor;

In the described grid bar centered cylinder is set, the top of described centered cylinder connects gear, the bottom connection bearing of described centered cylinder, and the band moving grid bar rotates;

One gear connects the dial of a regulation and control grid distance between tie rods.

Further, the irregular octagon that the cross section of described grid bar is, length of side parameter is: 13.88mm and 14.32mm.Described grid bar adopts specification to make for the PVC material of (GB/8814-2004), and its color is the blueness that large yellow Crocker is liked.

Further, the diameter of described centered cylinder is 5mm.

Further, described grid bar and centered cylinder adopt key to be connected, and described centered cylinder plays the position of fixed railing bar, do not allow the effect of grid bar double swerve, and the top of described centered cylinder connects gear, the bottom connection bearing of described centered cylinder, the rotation of band moving grid bar.Classification grid grid bar and centered cylinder can not misplace or relatively rotate after adopting key to be connected.

Further, the top of described centered cylinder is connected with the gear key.

Further, described gear tooth depth 1.73mm, wide 2.12mm; The chain chain pitch is 5.2mm;

Further, the parameter of described upper frame is 1500 * 50 * 40mm;

Further, described upper frame is a hermetically-sealed construction, and upper frame and classification grid junction are provided with the packing ring of waterproof.

Further, on the described upper frame float is set, described float is the cylinder shape bubble face float of white, and described float is connected with the upper frame binding.Float is bundled in the upper frame of classification case, and it is above for best that the upper frame of assurance classification case can swim in the water surface, alleviates the pressure of seal washer.

Further, described underframe is the stainless steel of 40mm or the rectangular frame that plastic-steel is made, and is inlaid with bearing above the described underframe, makes things convenient for classification grid Rotation With Changing spacing.

Further, described net sheet is that black, size of mesh are the net sheet of 2a=40mm, can guarantee adjustment voluntarily according to actual needs under the situation that large yellow Crocker can't pass.

Further, the lock of fixed position is set on the described dial, the groove of lock is held in described upper frame setting.

The beneficial effects of the utility model:

1, the utility model has adopted the pvc pipe of irregular polygon as the grid bar, the mode that adopts gear to combine with chain is simultaneously carried out the integral body regulation and control to the spacing of grid bar, thereby realize to body weight reach 300g, 400 and the large yellow Crocker of 500g screen, use of the present utility model can significantly reduce the sum of errors lethality that artificial visually examine or steelyard bring.

2 the utility model can carry out multistage regulation and control classification to large yellow Crocker according to the requirement of plant, because the large yellow Crocker body weight needs the large yellow Crocker in the net cage is carried out classification after reaching more than the 300g, the fish of different weight is separated feeding, reduce the grazing eclipse competition, and the fish that body weight reaches more than the 500g can come into the market to sell, and also needs classification to handle.

3 the utility model use fishpump, will significantly reduce working strength of workers and working time, can carry out classification to large yellow Crocker fast, satisfy and culture or market demands.

Description of drawings

Further specify the utility model below in conjunction with the drawings and specific embodiments.

Figure 1A is the vertical view of classification case.

Figure 1B is the front view of classification case.

Fig. 1 C is the end view of classification case.

Fig. 2 upper frame and classification grid structure chart.

The grid bar diverse location state diagram of Fig. 3 A classification grid.

The grid bar diverse location state diagram of Fig. 3 B classification grid.

The grid bar diverse location state diagram of Fig. 3 C classification grid.

The structural representation of Fig. 4 transmission device.

The partial enlarged drawing of Fig. 5 dial.

Number in the figure:

100 are the classification case, and 110 are the classification grid, and 120 are the classification grid, and 130 is the net sheet, and 140 is the net sheet, and 150 is the net sheet; 160 is float.

111 is upper frame, and 112 is underframe, and 113 is the grid bar, and 114 is centered cylinder, 115 gears, and 116 is chain, and 117 is key, and 118 is dial, and 119 is lock.

211 is first radius r ₁, 212 is second radius r ₂, 213 is the 3rd radius r ₃, 221 is the first spacing l ₁, 222 is the second spacing l ₂, 223 is the 3rd spacing l ₃,, 231 is the length of side, 232 is the length of side.

Embodiment

In order to make technological means of the present utility model, creation characteristic, to reach purpose and effect is easy to understand,, further set forth the utility model below in conjunction with specific embodiment.

Embodiment 1 large yellow Crocker biological data determination experiment

On November 6th, 2004, freezer has carried out biological parameter mensuration to 770 tail large yellow Crocker Pseudosciaena crocea in muntjac island, Pingyang County Aojiang town, Wenzhou City Pingyang County south development corporation, Ltd., comprises that body length, total length, body are wide, height, body week, body weight and sex.According to body weight that records and the wide data of body, carry out correlation analysis with MS-Excel.

Utilization geometric shape method (from body week measured value calculate the Sechin method) and data such as the Logistic model is wide to rheum officinale fish length, body, weight calculate.

Retention rate: refer to when fish contact fishing gear, belong to the probability that or different types of fish are retained by fishing gear.The probability that fish is retained can show with following formula table:

$p^{\mathrm{retained}}=p\{B_l^{\max }\≥B\}=1-\mathrm{\Φ}\left[\frac{B-k^{\max }{B}_l^{\max }}{\sqrt{{\left({\mathrm{\σ}}_l^{\max }\right)}^2+{\mathrm{\σ}}^2}}\right]$

The fish body average body of the long l of body that surveys is wide;

k ^Max: the fish body maximum body breadth k of place value, we get 0.975 here;

The wide standard deviation of fish body of the long l of body that surveys;

σ: the standard deviation of grille measured value;

Φ: accumulative total normal distyribution function.

Change original used body Zhou Yuti long data into body wide and body long data.When considering body week, also must consider the compressibility of fish body and the elasticity of mesh.The compressibility of fish body and the elasticity of netting twine are with the strength of fish, fish body hardness, netting twine material and different.Represent these factors by and a body week relation correction factor of increase (k-coefficient) long to body.

For the long object of fishing for for l of body, it is as follows that its selectivity can be carried out mathematical expression by the Logistic curve:

$S\left(l\right)=\frac{\exp (A+\mathrm{Bl})}{1+\exp (A+\mathrm{Bl})}$

In this formula, be not difficult to find out, because require S (l) to increase, so B＞0 along with the increase of the long l of body.Equally, be that 0 retention probability (selection rate) is 0 because we need body length, so A＜0.Can calculate the parameter expression of each selection index by following formula, for example, for the long L of 25% selective body _0.25:

$25\%=\frac{\exp (A+B*L_{0.25})}{1+\exp (A+B*L_{0.25})}$

$L_{0.25}=\frac{\ln 3+A}{B}$

In like manner, can obtain 50% and 75% selection index L _0.5, L _0.75:

$L_{0.5}=-\frac{A}{B}$

$L_{0.75}=\frac{\ln 3-A}{B}$

The also frequent more succinct mathematical expression form of type of service:

This formula can be put in order and is: a+bl=Ln (1/S-1)

L is that body is long in the formula, and a and b are selectivity parameter to be estimated, and its value is respectively a=-A, b=-B.S is retention rate and p ^RetainedImplication is identical.

Utilization geometric shape method estimates the retention rate of each fish body body length under the value of different classification grid interval earlier, use Logistic model and linear regression method to obtain the different classification grid Logistic curvilinear equation under the value at interval again, according to the requirement of classification netting gear design to the retention rate, the retention rate is carried out value (getting 90% here), according to the Logistic curvilinear equation under the different classification grid values of having obtained, calculate under certain retention rate, corresponding fish body body is long week in the different meshes, estimates the classification grid at interval and the linear equation between fish body body length with linear regression method.

Wide and the long relation equation of body of the final body that calculates:

L＝10.64B-108.51

The long relation equation of body weight and body:

W＝1.3×10 ^-3L ^2.2214

Formula obtains above using body weight and the wide relation of body are made the classification grid, and carry out actual tests 31 days～November 12 October in 2007 in the large yellow Crocker net cage of Fuding, Fujian, update the classification grid at interval according to test effect, draw table 1 conclusion at last:

Table 1 classification grid interval and body weight, the long table of comparisons of body

Body weight (g)	Body long (mm)	The classification grid are (mm) at interval
			?300	259.5748	33.56
?350	278.7232	35.31
			?400	295.744	36.86
?450	311.701	38.31
			?500	326.5942	39.67

According to the conclusion of table 1, wide according to the Different Weight body of large yellow Crocker, the cross section of grid bar is irregular 8 limit shapes, and different radii first radius r is arranged ₁211, the second radius r ₂212, the 3rd radius r ₃213, set classification grid (being the spacing of grid bar) first spacing l at interval ₁221, the second spacing l ₂222, the 3rd spacing l ₃223, be respectively 40mm, 36.66mm and 33.6mm, be used for respectively passing through, referring to Fig. 3 A, Fig. 3 B and Fig. 3 C by 400～500g, 300～400g, large yellow Crocker below the 300g.

Grid bar first radius r of Fig. 3 A classification grid ₁211 state diagrams, the first spacing l ₁221 is 40mm, and the large yellow Crocker that is fit to 400～500g passes through.

Grid bar second radius r of Fig. 3 B classification grid ₂212 state diagrams, the second spacing l ₂222 is 36.66mm, and the large yellow Crocker that is fit to 300～400g passes through.

Grid bar the 3rd radius r of Fig. 3 C classification grid ₃213 state diagrams, the 3rd spacing l ₃Be 33.6mm, be fit to the following large yellow Crocker of 300g and pass through.

The experiment of embodiment 2 net sheet color selectivity

Test in-8 days on the 6th April in 2005 again the deep water mesh cage of Nanji Island Development Co Ltd, Pingyang County carry out, totally 51 tails, wherein it has been taken a sample test at random the parameter of 10 tails, the long scope of body is 176mm～264mm, and average body is long to be 222.4mm, body wide region 22mm～34mm, average body is wide to be 26.7mm, and the height scope is 40mm～65mm, and average height is 52.4mm, weight range is 80g～270g, and average weight is 164g.This experiment is carried out in indoor pond, and the size in used pond is 4.7m * 4.8m, and the depth of water is between 90cm～110cm, and water temperature is 18.6 ℃ during experiment.

Adopt the long 526cm of being of a top network interface in the experiment, net height is the trawlnet that encloses that has purse seine and trawlnet character concurrently that the red net sheet of 117cm is made.The net sheet of black, blueness, green, orange, white, cinerous, red 7 kinds of colors has been adopted in this experiment, and used net sheet size is 100cm * 98cm, and mesh is 2a=110mm, is assemblied in to enclose trawlnet intermediate blank place.Drag the net sheet then and surround, in 5min, observe the large yellow Crocker percent of pass to the shoal of fish.Every kind of net sheet test three times, by the reaction experiment of large yellow Crocker to different colours (black, blueness, green, orange, white, cinerous, redness) net sheet, fish passes with the data of not passing the net sheet and sees Table 2.

The data cases that obtains during table 2 experiment

By this experiment as can be seen, large yellow Crocker has fear to black net sheet, therefore covers the classification case with black net sheet and helps quickening the large yellow Crocker classification all around.

Embodiment 3

A kind of adjustable large yellow Crocker grading plant, comprise net cage, fishpump and classification case, (specification is 50 meters of the girths of testing usefulness for Nan Jidao to net cage, the large-scale floating deep-water netted case resisting wind and wave of dark 8 meters homemade HDPE) (adopt yellow little China etc. in paper " the key technology research of jetting type fishpump and design ", to penetrate the formula fishpump with fishpump for the stream that cage culture designs, per hour can carry fish and water mixture 20t) connect, fishpump is connected with the classification case, net cage, fishpump are prior art, do not launch narration at this.

The structure of classification case 100 is shown in Figure 1A, Figure 1B and Fig. 1 C, and classification case 100 surrounds trench structure by framework, and framework comprises upper frame 111 and underframe 112.

Upper frame 111 is a rectangle structure, and the parameter of upper frame 111 is 1500 * 50 * 40mm; Upper frame 111 is a hermetically-sealed construction, and upper frame 111 and classification grid junction are provided with the packing ring (accompanying drawing does not illustrate) of waterproof.

Underframe is the stainless steel of 40mm or the rectangular frame that plastic-steel is made, and is inlaid with bearing above the underframe, makes things convenient for classification grid Rotation With Changing spacing.

Be provided with net sheet 150 between the underframe 112, net sheet and classification grid are set between underframe 112 and the upper frame 111, concrete front is provided with classification grid 110 and classification grid 120, and the left side is a net sheet 130, and the right side is a net sheet 140

The net sheet is black net sheet, and size of mesh is 2a=40mm, also can adopt other sizes, can guarantee to adjust voluntarily according to actual needs under the situation that large yellow Crocker can't pass.

As shown in Figure 2, the classification grid comprise complex root grid bar 113 compositions, and the cross section of grid bar 113 is irregular polygon, and as irregular octagon, length of side parameter is: the length of side 231 is 13.88mm, and the length of side 232 is 14.32mm.Grid bar 113 adopts specification to make for the PVC material of (GB/8814-2004), and its color is the blueness that large yellow Crocker is liked.

Upper frame 111 is provided with and drives the transmission device that the classification grid rotate, and transmission device comprises gear 115 and chain 116.

Underframe 112 is provided with and drives the bearing that the classification grid rotate, and bearing is connected (unpaid illustrating) with motor.

As shown in Figure 2, centered cylinder 114 is set in the grid bar 113, the diameter of centered cylinder 114 is 5mm.The top of centered cylinder 114 connects gear 115, its bottom connection bearing, thus the band moving grid bar rotates; Wherein the gear on the grid bar 113 115 connects the dial 118 of a regulation and control grid distance between tie rods.

As shown in Figure 4, grid bar 113 adopts key 117 to be connected with centered cylinder 114, and centered cylinder 114 plays the position of fixed railing bar 113, do not allow the effect of grid bar 113 double swerves, the top of centered cylinder 114 connects gear 115, the bottom connection bearing of centered cylinder 114, and the band moving grid bar rotates.Grid bar 113 also can be set to integral structure with centered cylinder 114, and grid bar 113 can not misplace or relatively rotate with centered cylinder 114.

The top of centered cylinder 114 also adopts key 117 to be connected with gear 115; Gear tooth depth 1.73mm, wide 2.12mm; The chain chain pitch is 5.2mm.

Once more referring on Figure 1A, Figure 1B and Fig. 1 C upper frame 111 float 160 being set, float 160 is the cylinder shape bubble face float of white, float 160 is bundled in upper frame 111, the upper frame 111 that guarantees classification case 110 can swim in more than the water surface to best, alleviate the pressure of the packing ring of upper frame 111 inner waterproofings, make packing ring play good sealing property.

As shown in Figure 5, dial 118 has the sign of sign 300g, 400g, 500g.The lock 119 of fixed position also is set on the dial 118, and corresponding position is provided with the groove (unpaid illustrating) that holds lock 119 on the upper frame 111.

Dial rotates to the sign of 500g, referring to grid bar first radius r of Fig. 3 A classification grid ₁211 state diagrams, the first spacing l ₁221 is 40mm, and the large yellow Crocker that is fit to 400～500g passes through.

Dial rotates to the sign of 400g, referring to grid bar second radius r of Fig. 3 B classification grid ₂212 state diagrams, the second spacing l ₂222 is 36.66mm, and the large yellow Crocker that is fit to 300～400g passes through.

Dial rotates to the sign of 300g, referring to grid bar the 3rd radius r of Fig. 3 C classification grid ₃213 state diagrams, the 3rd spacing l ₃Be 33.6mm, be fit to the following large yellow Crocker of 300g and pass through.

More than show and described basic principle of the present utility model, principal character and advantage of the present utility model.The technical staff of the industry should understand; the utility model is not restricted to the described embodiments; that describes in the foregoing description and the specification just illustrates principle of the present utility model; the utility model also has various changes and modifications under the prerequisite that does not break away from the utility model spirit and scope, and these changes and improvements all fall in claimed the utility model scope.The claimed scope of the utility model is defined by appending claims and equivalent thereof.

Claims (13)

1. an adjustable large yellow Crocker grading plant comprises net cage, fishpump and classification case, and described net cage is connected with fishpump, and described fishpump is connected with the classification case,

It is characterized in that described classification case surrounds trench structure by framework, described framework comprises upper frame and underframe, is provided with the net sheet between the described underframe, and net sheet and classification grid are set between described underframe and the upper frame; Described classification grid comprise complex root grid bar composition, and the cross section of described grid bar is irregular polygon,

Described upper frame is provided with and drives the transmission device that the classification grid rotate, and described transmission device comprises gear and chain;

Described underframe is provided with and drives the bearing that the classification grid rotate, and described bearing is connected with motor;

In the described grid bar centered cylinder is set, the top of described centered cylinder connects gear, the bottom connection bearing of described centered cylinder, and the band moving grid bar rotates;

One gear connects the dial of a regulation and control grid distance between tie rods.

2. adjustable large yellow Crocker grading plant according to claim 1 is characterized in that the cross section of described grid bar is irregular octagon, and length of side parameter is: 13.88mm and 14.32mm.

3. adjustable large yellow Crocker grading plant according to claim 1 is characterized in that the diameter of described centered cylinder is 5mm.

4. according to claim 2 or 3 described adjustable large yellow Crocker grading plants, it is characterized in that described grid bar adopts key to be connected with centered cylinder, the top of described centered cylinder connects gear, the bottom connection bearing of described centered cylinder, and the band moving grid bar rotates.

5. adjustable large yellow Crocker grading plant according to claim 4 is characterized in that the top of described centered cylinder is connected with the gear key.

6. adjustable large yellow Crocker grading plant according to claim 1 is characterized in that, described gear tooth depth 1.73mm, wide 2.12mm; The chain chain pitch is 5.2mm.

7. adjustable large yellow Crocker grading plant according to claim 1 is characterized in that the parameter of described upper frame is 1500 * 50 * 40mm.

8. adjustable large yellow Crocker grading plant according to claim 1 is characterized in that described upper frame is a hermetically-sealed construction, and upper frame and classification grid junction are provided with the packing ring of waterproof.

9. adjustable large yellow Crocker grading plant according to claim 8 is characterized in that, on the described upper frame float is set.

10. adjustable large yellow Crocker grading plant according to claim 9 is characterized in that, described float is the cylinder shape bubble face float of white, and described float is connected with the upper frame binding.

11. adjustable large yellow Crocker grading plant according to claim 1 is characterized in that, described underframe is the stainless steel of 40mm or the rectangular frame that plastic-steel is made, and is inlaid with bearing above the described underframe.

12. adjustable large yellow Crocker grading plant according to claim 1 is characterized in that, described net sheet is that black, size of mesh are the net sheet of 2a=40mm.

13. adjustable large yellow Crocker grading plant according to claim 1 is characterized in that the lock of fixed position is set on the described dial, and the groove of lock is held in described upper frame setting.

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