CN108569432B - Weighing method and weighing device for polycrystalline silicon - Google Patents
Weighing method and weighing device for polycrystalline silicon Download PDFInfo
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Abstract
The invention provides a weighing method of polycrystalline silicon, which comprises the following steps: respectively sending the crushed polysilicon blocks conveyed upstream into corresponding feeding bins C according to different size rangesiWherein i is not less than 1 and not more than n, n is an integer, and CiThe value of (i) is inversely proportional to the size of the corresponding polysilicon block; opening and closing the feeding bins C according to the sequence of 1 to niA bin gate of the charging bin CiThe polysilicon blocks fall into the weighing hoppers below the outlets of the feeding bins and are weighed by the weighing units below the weighing hoppers until the feeding bins CiThe quality of the output polysilicon block reaches the ith upper limit value S for the first timeiAnd closing the bin gate of the feeding bin after the feeding bin is closed, and closing the bin gate of the previous feeding bin before the bin gate of the next feeding bin is opened, so that the feeding bins discharge one by one. Correspondingly, a weighing device for polycrystalline silicon is provided. The invention can realize fully automatic high-precision quantitative weighing.
Description
Technical Field
The invention relates to the technical field of polycrystalline silicon production, in particular to a polycrystalline silicon weighing method and a polycrystalline silicon weighing device.
Background
Today, with the rapid development of automated production, automatic packaging equipment plays an increasingly important role in the goals of cost reduction and efficiency improvement and human resource investment reduction of production enterprises. With the high specification of product packaging and the high requirements of downstream customers brought forward by enterprises, the high-precision quantitative weighing of polycrystalline silicon becomes an important problem for polycrystalline silicon production enterprises.
At present, certain manual intervention, such as manual monitoring, manual weight compensation and the like, exists in the automatic product packaging process of polysilicon production enterprises at home and abroad. Specifically, the mainstream polysilicon production technology in the world at present is an improved siemens method, and rod-shaped polysilicon produced by adopting the technology can become irregular bodies with different sizes and shapes after being crushed, so that the mass of the polysilicon entering weighing equipment in unit time cannot be accurately controlled in the automatic weighing process, and the quantitative weighing with higher precision is difficult to realize; if quantitative weighing with the precision of 0.5 per mill is to be realized, domestic and foreign polysilicon production enterprises generally add manual intervention and supplement materials by manpower so as to meet the corresponding precision requirement.
Because manual intervention is added in the weighing process of the polycrystalline silicon, the full-automatic high-precision quantitative weighing cannot be realized, the weighing efficiency is low, and the risk of polycrystalline silicon pollution also exists. Moreover, the manual intervention means that subjective errors and misoperation may exist in the weighing process, so that the packaging quality of the polycrystalline silicon is difficult to unify and standardize, and quality errors are easy to occur, so that the polycrystalline silicon is complained by customers.
Disclosure of Invention
The invention aims to solve the technical problem of providing a polysilicon weighing method and a polysilicon weighing device which can realize fully automatic high-precision quantitative weighing aiming at the defects in the prior art.
The technical scheme adopted for solving the technical problem of the invention is as follows:
the invention provides a weighing method of polycrystalline silicon, which comprises the following steps:
respectively conveying the crushed polysilicon blocks conveyed upstream according to different size rangesInto corresponding charging bins CiWherein i is not less than 1 and not more than n, n is an integer, and CiThe value of (i) is inversely proportional to the size of the corresponding polysilicon block;
opening and closing the feeding bins C according to the sequence of 1 to niA bin gate of the charging bin CiThe polysilicon blocks fall into the weighing hoppers below the outlets of the feeding bins and are weighed by the weighing units below the weighing hoppers until the feeding bins CiThe quality of the output polysilicon block reaches the ith upper limit value S for the first timeiThen closing the bin gate of the feeding bin, and closing the bin gate of the previous feeding bin before opening the bin gate of the next feeding bin, so that the feeding bins discharge one by one, wherein Si＝G-GiG is the total target weight of the polycrystalline silicon block, GiIs the ith sub-weight, when 1 is not less than i<n is, GiNot less than the feeding bin CiThe mass of the heaviest chunk of polysilicon within the size range of the corresponding chunk of polysilicon, when i ═ n, Gi＝0。
The present invention also provides a polysilicon weighing apparatus, comprising:
a transmission unit for respectively conveying the crushed polysilicon blocks conveyed upstream into corresponding feeding bins C according to different size rangesiWherein i is not less than 1 and not more than n, n is an integer, and CiThe value of (i) is inversely proportional to the size of the corresponding polysilicon block;
the feeding bins are respectively used for receiving the polycrystalline silicon blocks with the corresponding size ranges from the transmission unit;
a control unit for sequentially opening and closing the feeding bins C according to the sequence from 1 to niA bin gate of the charging bin CiThe polycrystalline silicon blocks fall into a weighing hopper positioned below each feeding bin outlet;
a weighing hopper for receiving the polysilicon chunks from each feed bin;
the weighing unit is positioned below the weighing hopper and used for acquiring the mass of the polycrystalline silicon blocks in the current weighing hopper in real time;
the control unit is also used for feeding the material bin CiThe quality of the output polysilicon block reaches the ith upper limit value S for the first timeiRear doorClosing the bin gate and closing the bin gate of the previous feeding bin before opening the bin gate of the next feeding bin to enable the feeding bins to discharge one by one, wherein Si＝G-GiG is the total target weight of the polycrystalline silicon block, GiIs the ith sub-weight, when 1 is not less than i<n is, GiNot less than the feeding bin CiThe mass of the heaviest chunk of polysilicon within the size range of the corresponding chunk of polysilicon, when i ═ n, Gi＝0。
Has the advantages that:
the invention realizes high-precision quantitative weighing of crushed polycrystalline silicon lump materials which are screened and classified by adopting a combined weighing and gradual feeding process mode, does not need manual intervention in the whole process, has higher automation degree, can be applied to a polycrystalline silicon automatic packaging line, can ensure full-automatic quantification under the condition of no manual intervention and can realize the packaging of 0.5 per mill quantitative weighing deviation.
Drawings
Fig. 1 is a flowchart of a polysilicon weighing method provided in embodiment 1 of the present invention;
fig. 2 is a second flowchart of a polysilicon weighing method provided in embodiment 1 of the present invention;
fig. 3 is a third flowchart of a polysilicon weighing method provided in embodiment 1 of the present invention;
fig. 4 is a schematic view of a part of the structure of a polysilicon weighing device provided in embodiment 2 of the present invention;
fig. 5 is a schematic view of four loading bins and weighing hoppers according to embodiment 2 of the present invention.
In the figure: 1-a transmission channel; 2-a silicon block transfer basket; 3-a cylinder; 4-bridge-overlapping prevention plates; 5-a feeding bin; 5A-a first feeding bin; 5B-a second feeding bin; 5C-a third feeding bin; 5D-a fourth feeding bin; 6-electromagnetic vibration feeder; 7-a measuring hopper; 8-electronic scale.
Detailed Description
In order to make the technical solutions of the present invention better understood, the present invention is further described in detail below with reference to the accompanying drawings and examples.
The inventor finds that the existing polysilicon weighing mode has the following problems:
1) the weighing rate is severely low.
2) There is a manual malfunction. Since a link of human intervention exists, errors and mistakes in subjective consciousness of people inevitably occur, and the realization of the unqualified zero-weighing target of the polycrystalline silicon is directly influenced.
3) There is a risk of artificially contaminating the polysilicon. Even though various polysilicon manufacturers at home and abroad begin to pack high-cleanness polysilicon at present, the risk of polluting polysilicon products inevitably occurs by manual intervention in a packing chain, so that finished products cannot be packed at high standard, and even complaints of downstream customers are caused.
In order to solve the problems, the inventor provides a polycrystalline silicon weighing method and a polycrystalline silicon weighing device to realize automatic weighing, so that a manual intervention link is eliminated, polycrystalline silicon pollution caused by manual misoperation is eliminated, the weighing speed can be effectively improved, labor force is greatly saved, and the investment of the labor force in units is enabled to obtain higher output.
The method and apparatus for weighing polycrystalline silicon according to the present invention will be described in detail in examples 1 and 2, respectively.
Example 1:
the embodiment provides a polysilicon weighing method, as shown in fig. 1, which includes the following steps S101 and S102.
S101, respectively conveying the crushed polysilicon blocks conveyed upstream into corresponding feeding bins C according to different size rangesiWherein i is not less than 1 and not more than n, n is an integer, and CiIs inversely proportional to the size of the corresponding polysilicon block.
In other words, each charging bin CiEach corresponding to a range of sizes of the polysilicon chunks; and, CiThe larger the value of i, the smaller the size of the corresponding polysilicon chunk.
At present, the more common polysilicon grain size classification ranges (i.e. size ranges) include four, which are respectively 50-150 mm, 25-50 mm, 5-25 mm and 0-5 mm (note: mesh)The front automatic crushing process meets the requirement that the maximum grain diameter of the crushed silicon blocks is not more than 150 mm). The size ranges of these four polysilicon chunks correspond to four feeding bins (n ═ 4), respectively, namely: feed bin C1And a feeding bin C2And a feeding bin C3And a feeding bin C4. Furthermore, polysilicon blocks with the size range of 50-150 mm are fed into a feeding bin C1Internal; polysilicon blocks with the size range of 25-50 mm are fed into a feeding bin C2Internal; polycrystalline silicon blocks with the size range of 5-25 mm are fed into a feeding bin C3Internal; polycrystalline silicon blocks with the size range of 0-5 mm are fed into a feeding bin C4Interior, visible, CiIs inversely proportional to the size of the corresponding polysilicon block.
S102, opening and closing the feeding bins C according to the sequence from 1 to niA bin gate of the charging bin CiThe polysilicon blocks fall into the weighing hoppers below the outlets of the feeding bins and are weighed by the weighing units below the weighing hoppers until the feeding bins CiThe quality of the output polysilicon block reaches the ith upper limit value S for the first timeiThen closing the bin gate of the feeding bin, and closing the bin gate of the previous feeding bin before opening the bin gate of the next feeding bin, so that the feeding bins discharge one by one, wherein Si＝G-GiG is the total target weight of the polycrystalline silicon block, GiIs the ith sub-weight, when 1 is not less than i<n is, GiNot less than the feeding bin CiThe mass of the heaviest chunk of polysilicon within the size range of the corresponding chunk of polysilicon, when i ═ n, Gi0. The weighing unit can adopt an electronic scale, and the precision is preferably 1/3000.
Specifically, when n is 4, as shown in fig. 2, the charging bin C is opened first1A bin gate of the charging bin C1The polycrystalline silicon blocks (with the size range of 50-150 mm) fall into the weighing hoppers below the outlets of the feeding bins and are weighed by the weighing units below the weighing hoppers until the feeding bins C1The quality of the output polysilicon block reaches a first upper limit value S for the first time1Then closing the bin gate; then opening the feeding bin C2A bin gate of the charging bin C2The polycrystalline silicon blocks (with the size range of 25-50 mm) fall into the lower part of each feeding bin outletWeighing in the weighing hopper by using a weighing unit below the weighing hopper until the charging bin C2The quality of the output polysilicon block reaches a second upper limit value S for the first time2Then closing the bin gate; reopening the feed bin C3A bin gate of the charging bin C3The polycrystalline silicon blocks (with the size range of 5-25 mm) fall into the weighing hoppers below the outlets of the feeding bins and are weighed by the weighing units below the weighing hoppers until the feeding bins C3The quality of the output polysilicon block reaches a third upper limit value S for the first time3Then closing the bin gate; finally opening the feeding bin C4A bin gate of the charging bin C4The polycrystalline silicon blocks (with the size range of 0-5 mm) fall into the weighing hoppers below the outlets of the feeding bins and are weighed by the weighing units below the weighing hoppers until the feeding bins C4The quality of the output polysilicon block reaches a fourth upper limit value S for the first time4Then the door is closed.
Wherein each upper limit value SiSetting respective upper limit values S in relation to the size ranges of the corresponding polycrystalline silicon masses, in particular in relation to the mass of the heaviest polycrystalline silicon mass within the size ranges of the corresponding polycrystalline silicon massesi(i.e., upper weighing limit) is to prevent overweight. As for the target total weight G of the polysilicon block, it may be the same as the required weight of each bag of polysilicon block to be packaged, for example, 10kg, and it can be set and adjusted by those skilled in the art according to the actual situation. And each sub-weight GiWhen 1 is less than or equal to i<n is, GiShould not be less than the charging bin CiThe mass of the heaviest polysilicon block in the size range of the corresponding polysilicon block is as for the ith sub-weight and the feeding bin CiThe difference between the masses of the heaviest polysilicon chunks within the size range of the corresponding polysilicon chunks may be set by one skilled in the art according to actual conditions, for example, the difference may be set to 1 g; when i is n, Gi0, so that in the last filling bin CnWhen the bin gate(s) is closed, the mass of the polysilicon chunks in the weighing hopper below each feed bin outlet is exactly or very close to the target total weight G of the polysilicon chunks.
Generally, the size of the polycrystalline silicon block ranges from 50mm to 150mmThe heaviest mass of the polysilicon block was 1519.8745g (polysilicon density ρ 2.34 g/cm)3) Then G can be substituted1Set to 1520G, if G is 10kg, then S18480 g; the weight of the heaviest polycrystalline silicon block in the polycrystalline silicon blocks with the size range of 25-50 mm is 56.2917G, G can be obtained2Set at 57G, if G is 10kg, then S29943 g; the weight of the heaviest polycrystalline silicon block in the polycrystalline silicon blocks with the size range of 5-25 mm is 7.0365G, G can be obtained3Set to 8G, if G is 10kg, then S39992 g; the mass of the heaviest polycrystalline silicon block in the polycrystalline silicon blocks with the size range of 0-5 mm is only 0.0563G, G4Set to 0, if G is 10kg, then S4G10 kg. Wherein the mass of the heaviest of the polysilicon chunks for each size range is derived from multiple sampling experiments.
In addition, in order to avoid overweight caused by too many polysilicon blocks entering the weighing hopper in unit time and unable to feed back weight in time by the weighing unit, preferably, step S102 further includes: the electromagnetic vibration feeders arranged below the feeding bins are used for leading the corresponding feeding bins CiThe inner polysilicon blocks slide down uniformly and fall into the weighing hoppers below the outlets of the feeding bins.
In this embodiment, through set up an electromagnetic vibration charging means below every feeding bin, make the polycrystalline silicon piece of feeding bin bottom can rectilinear vibration, play and let the polycrystalline silicon piece in the effect of feeding bin bottom evenly distributed as far as possible, thereby make the polycrystalline silicon piece from the terminal accumulation rate that enables polycrystalline silicon piece quality in the weighing hopper when getting into the weighing hopper of feed bin as far as possible become fixed slope, adjust through the vibration frequency to the electromagnetic vibration charging means simultaneously, can control the polycrystalline silicon piece number that gets into the weighing hopper in the unit interval effectively, give the sufficient time feedback weight of weighing unit, thereby can effectively avoid overweight.
Further, in order to achieve quantitative weighing with high precision and strictly avoid overweight, step S102 further includes: when the weighing unit below the weighing hopper is used for weighing, the corresponding feeding bin C is controlled by the electromagnetic vibration feederiSo that the corresponding charging takes placeStorehouse CiAfter the polycrystalline silicon block with the previous wave falls into the weighing hopper and the weighing unit obtains the mass of the polycrystalline silicon block in the current weighing hopper, the corresponding feeding bin C is enabled to be arrangediThe polysilicon block slides to the measuring hopper when the inner wave is not less than 1<When n is higher, the feed bin C is arrangediThe mass of each wave of polycrystalline silicon block sliding to the measuring hopper is not more than GiTo ensure the charging bin CiAfter the polycrystalline silicon blocks with the last wave before the bin gate is closed fall into the weighing hopper, the mass of the polycrystalline silicon blocks in the weighing hopper is not more than the target total weight G of the polycrystalline silicon blocks; when i is equal to n, the feeding bin CiThe mass of each wave of polysilicon lumps sliding down the weighing hopper does not exceed a preset value, which can be set by a person skilled in the art according to practical situations, for example, the preset value can be selected from the range of 0-1 g, and for example, the preset value can be set to 0.5g or 1 g.
In this embodiment, through opening successively, closing the door of each feeding bin, make each feeding bin ejection of compact one by one, realized that the combination formula is weighed. However, in practical applications, it may also happen that only the first few loading bins are discharged to be very close to the target total weight G of the polysilicon block, and then the subsequent loading bins are overweight when the discharging is continued, and in order to deal with this, it is preferable that, as shown in fig. 3, the step S102 includes: in a charging bin C1In the discharging process, the quality of the output polycrystalline silicon block reaches a first upper limit value S for the first time1And closing the charging bin C1After the bin gate, whether the quality of the polysilicon blocks in the current measuring hopper reaches a second upper limit value S or not needs to be judged2If the second upper limit value S is not reached2Then the latter charging bin C needs to be opened2The door of the latter charging bin C2Starting to discharge until reaching a second upper limit value S2(ii) a If the second upper limit value S has been reached2Then the feed bin C needs to be closed2The bin gate of the measuring hopper, and further judging whether the quality of the polysilicon blocks in the current measuring hopper reaches a third upper limit value S3If the third upper limit value S is not reached3Then the latter charging bin C needs to be opened3The bin gate of the feeding bin makes the latter feeding binC3Starting to discharge until reaching a third upper limit value S3(ii) a If the third upper limit value S has been reached3The feeding bin C needs to be closed3The bin gate is analogized until the mass of the polycrystalline silicon blocks in the current measuring hopper is judged to reach the target total weight G of the polycrystalline silicon (namely the nth upper limit value S)n) And closing the feed bin CnThe bin gate.
It should be noted that, before step S101, steps of crushing, cleaning after crushing, and classifying according to a size range after cleaning are also required, and these steps are all the prior art, for example, many polysilicon manufacturing enterprises have implemented screening of polysilicon blocks with different sizes at present, and thus this embodiment is not described again.
The polysilicon weighing method can be realized by PLC programming. Specifically, through editing the PLC program in advance, if the target total weight G of the polycrystalline silicon blocks is 10kg, firstly, the feeding bin C where the polycrystalline silicon blocks in the range of 50mm-150mm are located is used1The bin door is opened and the material feeding bin C is arranged1The electromagnetic vibration feeder below the weighing device operates to realize the charging and weighing of the silicon blocks with the maximum grain diameter, namely the silicon blocks with the grain diameter within the range of 50mm-150mm, and simultaneously, the upper limit of the first weighing of the electronic scale is required to be preset, namely the first upper limit S is preset1Since the maximum mass of the silicon mass in the particle size range of 50mm to 150mm is 1519.8745G, the first sub-weight G11520g, the first upper limit value S18480g, once the electronic scale displays that the set condition 8480g is reached for the first time, the electronic scale transmits a signal of reaching the weight to the equipment program and sends the signal to the feeding bin C by the program1Bin gate and charging bin C1The electromagnetic vibrator below outputs a closing signal and then feeds the material to the next-stage feeding bin C2The bin gate outputs an opening signal and feeds the material bin C2And the electromagnetic vibration feeder below outputs an operation signal, and the silicon blocks with the particle sizes within the range of 25-50 mm in the next grade are added and weighed. By analogy, the maximum weight of the silicon blocks with the grain diameter within the range of 25mm-50mm does not exceed 56.2917g, the maximum weight of the silicon blocks with the grain diameter within the range of 5mm-25mm does not exceed 7.0365g, and the maximum weight of the silicon blocks with the grain diameter below 5mm does not exceed 0.0563g, the second upper limit value S29943g, a third upper limit value S39992g, a fourth upper limit value S410000g (i.e., 10kg) was set. Meanwhile, the logical relationship between each upper limit value and the bin gate of each feeding bin needs to be set, when the electronic scale reaches the upper limit preset value of the primary weighing, a signal is fed back to the equipment program, and after the feedback signal is received, the signal is fed back to the corresponding feeding bin C by the programiThe bin gate outputs a closing signal and feeds the material bin CiThe electromagnetic vibration feeder below outputs a stop signal, and the stop signal is delayed for a certain time and then goes to the feeding bin C with the next grain size gradei+1The bin gate outputs an opening signal and feeds the material to the feeding bin Ci+1And the electromagnetic vibration feeder below outputs an operation signal, so that weighing is carried out according to a grading combined weighing mode. After the bin gate of the last-stage feeding bin is opened, silicon blocks with the particle size of less than 5mm fall, and after the electromagnetic vibration frequency is adjusted, the mass of polycrystalline silicon in the metering hopper can be increased one gram by one gram, and finally, the error of each bag of polycrystalline silicon (taking 10kg of each bag as an example) is controlled within +/-5 g, so that the precision of weighing is 0.5 per thousand.
In conclusion, the polycrystalline silicon weighing method can eliminate manual intervention, realize full automation of the weighing process and reduce labor input; the precision of quantitative weighing of the polycrystalline silicon is guaranteed, and the precision target of 0.5 per mill is realized; the operation is simple, the speed of the weighing process is greatly improved, and the yield efficiency of the polycrystalline silicon finished product is improved; weighing errors possibly caused by manpower and pollution to the polycrystalline silicon are eliminated, high-specification packaging of polycrystalline silicon finished products is realized, and the gold content of enterprise brands is improved.
Example 2:
the present embodiment provides a polysilicon weighing apparatus, as shown in fig. 4-5, comprising a transfer unit, a plurality of loading bins 5, a weighing hopper 7, a weighing unit and a control unit (not shown in the figure). Wherein, the weighing unit can adopt an electronic scale 8, and the precision is preferably 1/3000.
Wherein, the transmission unit is used for respectively sending the crushed polysilicon blocks conveyed at the upstream into the corresponding feeding bins C according to different size rangesiWherein i is not less than 1 and not more than n, n is an integer, and CiI value of (2) and corresponding multipleThe size of the silicon boules is inversely proportional. In other words, each charging bin CiEach corresponding to a range of sizes of the polysilicon chunks; and, CiThe larger the value of i, the smaller the size of the corresponding polysilicon chunk.
Specifically, the transmission unit can comprise a transmission channel 1 and a plurality of silicon block transfer baskets 2, and the silicon block transfer baskets 2 are the same in number and correspond to the feeding bins one by one; the conveying channel 1 is used for conveying the crushed polysilicon blocks with different size ranges conveyed upstream to the silicon block transferring baskets 2 respectively; the silicon block transfer basket 2 is used for pouring the polysilicon blocks in the silicon block transfer basket into the corresponding feeding bin CiAnd (4) the following steps.
At present, the more common classification ranges (i.e. size ranges) of the polysilicon grain size include four, which are respectively 50-150 mm, 25-50 mm, 5-25 mm and 0-5 mm. The size ranges of these four polysilicon chunks correspond to four feeding bins (n ═ 4), respectively, namely: feed bin C1(corresponding to the first feeding chamber 5A in FIG. 5), feeding chamber C2(corresponding to the second feeding chamber 5B in FIG. 5), feeding chamber C3(corresponding to the third feed hopper 5C in FIG. 5) and feed hopper C4(corresponding to the fourth feed bin 5D in fig. 5). Furthermore, polysilicon blocks with the size range of 50-150 mm are fed into a feeding bin C1Internal; polysilicon blocks with the size range of 25-50 mm are fed into a feeding bin C2Internal; polycrystalline silicon blocks with the size range of 5-25 mm are fed into a feeding bin C3Internal; polycrystalline silicon blocks with the size range of 0-5 mm are fed into a feeding bin C4Interior, visible, CiIs inversely proportional to the size of the corresponding polysilicon block. Of course, each charging bin CiAre referred to as the feed bin 5 shown in figure 4.
Feed bin CiFor receiving the corresponding size range of the polycrystalline silicon mass from the silicon mass transfer basket 2 of the transport unit.
The control unit is used for sequentially opening and closing the feeding bins C according to the sequence from 1 to niA bin gate of the charging bin CiThe polycrystalline silicon chunks fall into a weighing hopper 7 located below the outlet of each feed bin.
A weighing hopper 7 for receiving the feed from each hopper CiThe polycrystalline silicon block of (1).
And the weighing unit (electronic scale 8) is positioned below the weighing hopper 7 and used for acquiring the mass of the polysilicon block in the weighing hopper 7 in real time.
The control unit is also used for feeding the material bin CiThe quality of the output polysilicon block reaches the ith upper limit value S for the first timeiThen closing the bin gate of the feeding bin, and closing the bin gate of the previous feeding bin before opening the bin gate of the next feeding bin, so that the feeding bins discharge one by one, wherein Si＝G-GiG is the total target weight of the polycrystalline silicon block, GiIs the ith sub-weight, when 1 is not less than i<n is, GiNot less than the feeding bin CiThe mass of the heaviest chunk of polysilicon within the size range of the corresponding chunk of polysilicon, when i ═ n, Gi＝0。
Specifically, if n is 4, the control unit opens the feeding bin C first1A bin gate of the charging bin C1The polycrystalline silicon blocks (with the size range of 50-150 mm) fall into the weighing hoppers 7 positioned below the outlets of the feeding bins and are weighed by the weighing units below the weighing hoppers 7 until the feeding bins C1The quality of the output polysilicon block reaches a first upper limit value S for the first time1Then closing the bin gate; then opening the feeding bin C2A bin gate of the charging bin C2The polycrystalline silicon blocks (with the size range of 25-50 mm) fall into the weighing hoppers 7 positioned below the outlets of the feeding bins and are weighed by the weighing units below the weighing hoppers 7 until the feeding bins C2The quality of the output polysilicon block reaches a second upper limit value S for the first time2Then closing the bin gate; reopening the feed bin C3A bin gate of the charging bin C3The polycrystalline silicon blocks (with the size range of 5-25 mm) fall into the weighing hoppers 7 positioned below the outlets of the feeding bins and are weighed by the weighing units below the weighing hoppers 7 until the feeding bins C3The quality of the output polysilicon block reaches a third upper limit value S for the first time3Then closing the bin gate; finally opening the feeding bin C4A bin gate of the charging bin C4The polycrystalline silicon blocks (with the size range of 0-5 mm) fall into the weighing hoppers 7 positioned below the outlets of the feeding bins and are weighed by the weighing units below the weighing hoppers 7 until the feeding bins C4Of the outputThe quality of the polycrystalline silicon block reaches a fourth upper limit value S for the first time4Then the door is closed.
Wherein each upper limit value SiSetting respective upper limit values S in relation to the size ranges of the corresponding polycrystalline silicon masses, in particular in relation to the mass of the heaviest polycrystalline silicon mass within the size ranges of the corresponding polycrystalline silicon massesi(i.e., upper weighing limit) is to prevent overweight. As for the target total weight G of the polysilicon block, it may be the same as the required weight of each bag of polysilicon block to be packaged, for example, 10kg, and it can be set and adjusted by those skilled in the art according to the actual situation. And each sub-weight GiWhen 1 is less than or equal to i<n is, GiShould not be less than the charging bin CiThe mass of the heaviest polysilicon block in the size range of the corresponding polysilicon block is as for the ith sub-weight and the feeding bin CiThe difference between the masses of the heaviest polysilicon chunks within the size range of the corresponding polysilicon chunks may be set by one skilled in the art according to actual conditions, for example, the difference may be set to 1 g; when i is n, Gi0, so that in the last filling bin CnWhen the bin gate(s) is closed, the mass of the polysilicon chunks in the weighing hopper below each feed bin outlet is exactly or very close to the target total weight G of the polysilicon chunks.
Generally, the mass of the heaviest polycrystalline silicon block among the polycrystalline silicon blocks having a size range of 50 to 150mm is 1519.8745g (polycrystalline silicon density ρ is 2.34 g/cm)3) Then G can be substituted1Set to 1520G, if G is 10kg, then S18480 g; the weight of the heaviest polycrystalline silicon block in the polycrystalline silicon blocks with the size range of 25-50 mm is 56.2917G, G can be obtained2Set at 57G, if G is 10kg, then S29943 g; the weight of the heaviest polycrystalline silicon block in the polycrystalline silicon blocks with the size range of 5-25 mm is 7.0365G, G can be obtained3Set to 8G, if G is 10kg, then S39992 g; the mass of the heaviest polycrystalline silicon block in the polycrystalline silicon blocks with the size range of 0-5 mm is only 0.0563G, G4Set to 0, if G is 10kg, then S4G10 kg. Wherein the mass of the heaviest of the polysilicon chunks for each size range is derived from multiple sampling experiments.
In addition, in order to avoid overweight caused by too many polysilicon blocks entering the weighing hopper in unit time and incapable of timely feeding back weight of the weighing unit, the weighing device can also comprise a weighing unit arranged in each feeding bin CiA lower electromagnetic vibration feeder 6 for making the corresponding feeding bin CiThe inner polysilicon blocks slide down uniformly and fall into the weighing hoppers 7 positioned below the outlets of the feeding bins.
In this embodiment, through adding feed bin 5 below at every and setting up an electromagnetic vibration charging means 6, make the polycrystalline silicon piece that adds the feed bin bottom can rectilinear vibration, play and let the polycrystalline silicon piece in the effect of adding feed bin bottom evenly distributed as far as possible, thereby make the polycrystalline silicon piece from the terminal accumulation rate that enables polycrystalline silicon piece quality in the hopper 7 when getting into the hopper 7 of feed bin as far as possible become fixed slope, adjust through the vibration frequency to electromagnetic vibration charging means 6 simultaneously, can control effectively and get into the polycrystalline silicon piece number that gets into hopper 7 in the unit interval, give the sufficient time feedback weight of weighing unit, thereby can effectively avoid overweight.
Further, in order to realize high-precision quantitative weighing and strictly avoid overweight, the electromagnetic vibration feeder 6 is also used for controlling the corresponding feeding bin CiSo that the corresponding charging bin CiAfter the polycrystalline silicon blocks with the previous wave fall into the weighing hopper 7 and the weighing unit obtains the mass of the polycrystalline silicon blocks in the current weighing hopper 7, the corresponding feeding bin C is enabled to be arrangediThe polysilicon block slides to the weighing hopper 7, and when i is more than or equal to 1<When n is higher, the feed bin C is arrangediThe mass of each wave of polycrystalline silicon block sliding to the adding hopper 7 is not more than GiTo ensure the charging bin CiAfter the polycrystalline silicon blocks with the last wave before the bin gate is closed fall into the weighing hopper, the mass of the polycrystalline silicon blocks in the weighing hopper is not more than the target total weight G of the polycrystalline silicon blocks; when i is equal to n, the feeding bin CiThe mass of each wave of polysilicon lumps sliding down the weighing hopper 7 does not exceed a predetermined value, which can be set by a person skilled in the art according to the actual situation, for example, the predetermined value can be selected from the range of 0-1 g, for example, the predetermined value can be set to 0.5g or 0.5g1g。
In this embodiment, each feeding bin C is opened and closed in sequenceiA bin gate for each charging bin CiAnd discharging materials one by one, so that combined weighing is realized. However, in practice, it may also happen that only the first few feed bins (e.g. the first feed bin 5A and the second feed bin 5B) are discharged very close to the target total weight G of the polycrystalline silicon ingot, and the subsequent feed bin is then again discharged too much, and to cope with this, the control unit is preferably adapted to control the discharge in the feed bin C1In the discharging process, the quality of the output polycrystalline silicon block reaches a first upper limit value S for the first time1And closing the charging bin C1After the bin gate, whether the quality of the polysilicon blocks in the current measuring hopper reaches a second upper limit value S or not needs to be judged2If the second upper limit value S is not reached2Then the latter charging bin C needs to be opened2The door of the latter charging bin C2Starting to discharge until reaching a second upper limit value S2(ii) a If the second upper limit value S has been reached2Then the feed bin C needs to be closed2The bin gate of the measuring hopper, and further judging whether the quality of the polysilicon blocks in the current measuring hopper reaches a third upper limit value S3If the third upper limit value S is not reached3Then the latter charging bin C needs to be opened3The door of the latter charging bin C3Starting to discharge until reaching a third upper limit value S3(ii) a If the third upper limit value S has been reached3The feeding bin C needs to be closed3The bin gate is analogized until the mass of the polycrystalline silicon blocks in the current measuring hopper is judged to reach the target total weight G of the polycrystalline silicon (namely the nth upper limit value S)n) And closing the feed bin CnThe bin gate.
The feeding bin 5 can be designed as an anti-bridging feeding bin to prevent the discharge port of the bin from being blocked due to bridging during the blanking of massive silicon materials, and the specific structure of the feeding bin 5 is described in detail below.
Add feed bin 5 and include the feed bin body, the bottom of feed bin body is equipped with discharge gate and door, can forbid when the door is closed to add the feed bin ejection of compact. The feed bin body is including being the slope setting prevent taking bridge plate 4, adds feed bin 5 and still including fixing on the feed bin body and being located the bottom plate pivot and the cylinder 3 of preventing taking bridge plate 4 below, and bottom plate pivot and cylinder 3 still are connected with the bottom surface of preventing taking bridge plate 4, and when the silicon block bridging appears, cylinder 3 is used for driving and prevents taking bridge plate 4 upwards, rotate downwards around the bottom plate pivot in order to destroy the balance of the power between the silicon block to reach the mesh of breaking a bridge. Wherein, the cylinder 3 adopts an oilless cylinder; the rotating shaft of the bottom plate adopts an oilless rotating shaft.
The bin body comprises two opposite bin vertical side walls and a bin oblique side wall arranged between the two vertical side walls, and the anti-bridging plate 4 is also arranged between the two bin vertical side walls and is opposite to the bin oblique side wall so as to form the bin body with a hollow chamfered platform-shaped structure; the discharge hole at the bottom of the stock bin body is a rectangular hole. The body of cylinder 3 passes through linking bridge to be fixed on the vertical lateral wall of two feed bins.
An acute angle formed by the inclined side wall of the storage bin and the horizontal plane is 67-90 degrees; when the bottom end of the anti-bridging plate 4 is at the preset lowest position, the included acute angle between the bottom end and the horizontal plane is 28-45 degrees.
The distance between the connecting position of the cylinder 3 on the bottom surface of the anti-bridging plate 4 and the top end of the anti-bridging plate 4 is one third of the length of the anti-bridging plate 4, and the length direction of the anti-bridging plate 4 is the same as the inclination direction of the anti-bridging plate.
The bin body is made of stainless steel plates; the outer wall of the stock bin body is coated with an anticorrosive and anti-pollution nano ceramic or plastic coating; the inner wall of the bin body is coated with a PU coating or a ceramic coating; the anti-bridging plate 4 is a plate-shaped part coated with a clean non-metallic material on the surface.
The feeding bin 5 further comprises a free falling prevention baffle fixed inside the bin body and used for reducing the speed of the polycrystalline silicon lump material when the polycrystalline silicon lump material descends inside the bin body. The anti-free falling body baffle comprises two sub-boards of which the top ends are connected and the bottom ends are free ends, and the included angles between the two sub-boards and the horizontal plane are acute angles; the side that lies in one side in the side that lies in both sides of two daughter boards is fixed on the vertical lateral wall of a feed bin, and the side that lies in the opposite side contacts with the vertical lateral wall of another feed bin, or the side that lies in both sides of two daughter boards is fixed respectively on two vertical lateral walls of feed bin. The included angle of the bottom surfaces of the two daughter boards is 90-120 degrees.
It should be noted that before the combined weighing, procedures of crushing, cleaning after crushing, and classifying according to size ranges after cleaning need to be performed on the polycrystalline silicon, and these procedures are prior art, for example, many polycrystalline silicon manufacturing enterprises have implemented screening on polycrystalline silicon blocks with different sizes at present, so this embodiment is not described again.
The polycrystalline silicon weighing device mainly realizes high-precision quantitative weighing of polycrystalline silicon by screening, classifying and combined weighing of polycrystalline silicon. The working principle is described in detail below:
firstly, polysilicon blocks subjected to upstream crushing, screening and cleaning respectively enter corresponding silicon block transfer baskets 2 through a transmission channel 1 according to four size ranges, wherein the four size ranges are 50-150 mm, 25-50 mm, 5-25 mm and 0-5 mm. The silicon briquette transferring basket 2 is designed to be capable of being turned over clockwise by 90 degrees, and the polysilicon briquettes in the silicon briquette transferring basket are poured into the corresponding feeding bin. Of course, four different-sized feed bins need to be pre-fabricated to receive and store the polysilicon chunks sent by the upstream conveyor line in different size ranges.
Then, set up an electromagnetic vibration charging means 6 in the bottom of every feeding bin 5, wherein include frequency conversion shock dynamo, after the silicon briquette got into to correspond feeding bin, made the silicon briquette evenly glide by motor vibrations to make the export of each feeding bin concentrate in same department. As shown in fig. 5, four feeding bins are respectively arranged along four directions.
A weighing hopper 7 is arranged below the outlet of each feeding bin, and an electronic scale 8 with the accuracy of 1/3000 is arranged below the weighing hopper 7, so that silicon blocks enter the weighing hopper 7 from the outlet of each feeding bin in sequence.
When the electronic scale 8 displays that the first upper limit value S is reached1And stopping vibrating the electromagnetic vibration feeder 6 below the first feeding bin 5A where the silicon blocks of 50mm-150mm are positioned and closing the bin gate of the first feeding bin 5A, and so on until the electromagnetic vibration feeder 6 below the fourth feeding bin 5D stops vibrating and closes the bin gate of the fourth feeding bin 5D, thereby completing the combined weighing.
And finally, after the polysilicon blocks in the weighing hoppers subjected to combined weighing are qualified through a downstream re-weigher, entering a downstream packaging process for further packaging.
In conclusion, the polycrystalline silicon weighing device can eliminate manual intervention, realize full automation of the weighing process and reduce labor input; the precision of quantitative weighing of the polycrystalline silicon is guaranteed, and the precision target of 0.5 per mill is realized; the operation is simple, the speed of the weighing process is greatly improved, and the yield efficiency of the polycrystalline silicon finished product is improved; weighing errors possibly caused by manpower and pollution to the polycrystalline silicon are eliminated, high-specification packaging of polycrystalline silicon finished products is realized, and the gold content of enterprise brands is improved.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (10)
1. A method for weighing polycrystalline silicon is characterized by comprising the following steps:
respectively sending the crushed polysilicon blocks conveyed upstream into corresponding feeding bins C according to different size rangesiWherein i is not less than 1 and not more than n, n is an integer, and CiThe larger the value of i, the smaller the size of the corresponding polysilicon chunk in the size range of the polysilicon chunk;
opening and closing the feeding bins C according to the sequence of 1 to niA bin gate of the charging bin CiThe polysilicon blocks fall into the weighing hoppers below the outlets of the feeding bins and are weighed by the weighing units below the weighing hoppers until the feeding bins CiThe quality of the output polysilicon block reaches the ith upper limit value S for the first timeiThen closing the bin gate of the feeding bin, and closing the bin gate of the previous feeding bin before opening the bin gate of the next feeding bin, so that the feeding bins discharge one by one, wherein Si＝G-GiG is the total target weight of the polycrystalline silicon block, GiIs the ith sub-weight, when 1 is not less than i<n is, GiNot less than the feeding bin CiThe mass of the heaviest chunk of polysilicon within the size range of the corresponding chunk of polysilicon, when i ═ n, Gi＝0。
2. The weighing method according to claim 1, further comprising the steps of: the electromagnetic vibration feeders arranged below the feeding bins are used for leading the corresponding feeding bins CiThe inner polysilicon blocks slide down uniformly and fall into the weighing hoppers below the outlets of the feeding bins.
3. Weighing method according to claim 2, characterised in that it comprises, when weighing with a weighing cell under the weighing hopper, the following further steps:
controlling corresponding feeding bin C by using electromagnetic vibration feederiSo that the corresponding charging bin CiAfter the polycrystalline silicon block with the previous wave falls into the weighing hopper and the weighing unit obtains the mass of the polycrystalline silicon block in the current weighing hopper, the corresponding feeding bin C is enabled to be arrangediThe polysilicon block slides to the measuring hopper when the inner wave is not less than 1<When n is higher, the feed bin C is arrangediThe mass of each wave of polycrystalline silicon block sliding to the measuring hopper is not more than Gi(ii) a When i is equal to n, the feeding bin CiThe mass of each wave of polycrystalline silicon block sliding to the measuring hopper does not exceed a preset value; the preset value is selected from the range of 0-1 g.
4. Weighing method according to any one of claims 1-3, characterised in that the different sizes range from 50 to 150mm, from 25 to 50mm, from 5 to 25mm and from 0 to 5mm, respectively.
5. A polysilicon weighing apparatus, comprising:
a transmission unit for respectively conveying the crushed polysilicon blocks conveyed upstream into corresponding feeding bins C according to different size rangesiWherein i is not less than 1 and not more than n, n is an integer, and CiThe larger the value of i, the size range of the corresponding polysilicon blockThe smaller the size of the silicon block in the enclosure is;
the feeding bins are respectively used for receiving the polycrystalline silicon blocks with the corresponding size ranges from the transmission unit;
a control unit for sequentially opening and closing the feeding bins C according to the sequence from 1 to niA bin gate of the charging bin CiThe polycrystalline silicon blocks fall into a weighing hopper positioned below each feeding bin outlet;
a weighing hopper for receiving the polysilicon chunks from each feed bin;
the weighing unit is positioned below the weighing hopper and used for acquiring the mass of the polycrystalline silicon blocks in the current weighing hopper in real time;
the control unit is also used for feeding the material bin CiThe quality of the output polysilicon block reaches the ith upper limit value S for the first timeiThen closing the bin gate of the feeding bin, and closing the bin gate of the previous feeding bin before opening the bin gate of the next feeding bin, so that the feeding bins discharge one by one, wherein Si＝G-GiG is the total target weight of the polycrystalline silicon block, GiIs the ith sub-weight, when 1 is not less than i<n is, GiNot less than the feeding bin CiThe mass of the heaviest chunk of polysilicon within the size range of the corresponding chunk of polysilicon, when i ═ n, Gi＝0。
6. A weighing apparatus according to claim 5, further comprising an electromagnetically vibratable feeder disposed below each hopper for causing the corresponding hopper C to be fediThe inner polysilicon blocks slide down uniformly and fall into the weighing hoppers below the outlets of the feeding bins.
7. The weighing apparatus according to claim 6, wherein the electromagnetic vibratory feeder is further adapted to control the respective feeding bin CiSo that the corresponding charging bin CiAfter the polycrystalline silicon block with the previous wave falls into the weighing hopper and the weighing unit obtains the mass of the polycrystalline silicon block in the current weighing hopper, the corresponding feeding bin C is enabled to be arrangediThe polysilicon block slides to the measuring hopper when the inner wave is not less than 1<When n, the secondary feeding binCiThe mass of each wave of polycrystalline silicon block sliding to the adding hopper is not more than Gi(ii) a When i is equal to n, the feeding bin CiThe mass of each wave of polycrystalline silicon block sliding to the measuring hopper does not exceed a preset value; the preset value is selected from the range of 0-1 g.
8. A weighing apparatus as claimed in any one of claims 5 to 7 wherein the different sizes are in the range 50 to 150mm, 25 to 50mm, 5 to 25mm and 0 to 5mm respectively.
9. Weighing device according to any one of claims 5-7, characterised in that the accuracy of the weighing cell is 1/3000.
10. The weighing device according to any one of claims 5 to 7, wherein the conveying unit comprises a conveying channel and a plurality of silicon block transferring baskets, and the silicon block transferring baskets are in the same number and correspond to the feeding bins one by one;
the conveying channel is used for conveying the crushed polysilicon blocks in different size ranges conveyed upstream to the silicon block transferring baskets respectively;
the silicon block transfer basket is used for pouring the polycrystalline silicon blocks in the silicon block transfer basket into the corresponding feeding bin.
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| CN203080038U (en) * | 2013-01-24 | 2013-07-24 | 宝钛集团有限公司 | Automatic batching system for alloy |
| CN105292596A (en) * | 2014-06-16 | 2016-02-03 | 新特能源股份有限公司 | Polycrystalline silicon bagging metering control system |
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| JP5030723B2 (en) * | 2007-09-18 | 2012-09-19 | 勝三 川西 | Combination scale |
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| EP1225430A1 (en) * | 2001-01-19 | 2002-07-24 | Ishida Co., Ltd. | Combination weighing apparatus |
| CN201506484U (en) * | 2009-08-14 | 2010-06-16 | 安徽省长科机械科技有限公司 | Automatic weighing apparatus applied in field of packaging equipment |
| DE102011003875A1 (en) * | 2011-02-09 | 2012-08-09 | Wacker Chemie Ag | Method and device for dosing and packaging polysilicon fragments as well as dosing and packaging unit |
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| CN105292596A (en) * | 2014-06-16 | 2016-02-03 | 新特能源股份有限公司 | Polycrystalline silicon bagging metering control system |
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Application publication date: 20180925 Assignee: Inner Mongolia Xinte silicon material Co.,Ltd. Assignor: XINTE ENERGY Co.,Ltd. Contract record no.: X2022990000326 Denomination of invention: Weighing method and device of polysilicon Granted publication date: 20200508 License type: Common License Record date: 20220627 Application publication date: 20180925 Assignee: Xinte silicon based new materials Co.,Ltd. Assignor: XINTE ENERGY Co.,Ltd. Contract record no.: X2022990000325 Denomination of invention: Weighing method and device of polysilicon Granted publication date: 20200508 License type: Common License Record date: 20220627 |