A method for optimizing parameters of a screw feeder and a test device thereof

Abstract

The application discloses a kind of helical feeding device parameter optimization test method and its test device, by test device to selected material is carried out conveying test: first according to the helical diameter value of test device, respectively determine the value range of helical shaft rotational speed value and pitch value;In corresponding value range, respectively select the rotational speed value and pitch value of current test point, and adjust corresponding parameter on test device to start test;After a certain feeding time, test result is obtained;Compare the test results of current test and last test, gradually narrow the value range, to determine the optimal value interval E of rotational speed value and pitch value;According to the obtained optimal value interval E, the rotational speed formula of helical shaft and the calculation formula of pitch are used to calculate the reasonable A value and K1 value of selected material;The application can test different materials, obtain the coefficient related to the characteristics of each material in the formula by calculation, so as to calculate the reasonable parameter value in practical application.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of screw feeding device, in particular to a screw feeding device parameter optimization test method and test device thereof. BACKGROUND

[0002] The main design parameters of the screw feeding device are screw diameter, screw shaft rotation speed and screw pitch of the screw blade, and the screw diameter is usually selected first according to the required production rate. When the screw diameter is determined, the screw shaft rotation speed and the screw pitch of the screw blade are mainly determined according to the material characteristics. There are more than one hundred kinds of materials transported by the screw conveyor, and the common textbooks only give the calculation formula of several typical materials. People often estimate according to the empirical formula given in the book, and there is almost no test data for the screw feeder. The related formula of the screw conveyor is usually used for calculation, which brings blindness to the parameter selection and is not the optimal value. It is difficult to achieve the purpose of improving the conveying capacity and reducing the energy consumption. Therefore, a test device with simple structure and low cost is designed and manufactured, and a test method is optimized. Different materials are tested at a lower cost, so as to optimize the reasonable parameter value. SUMMARY

[0003] The present application provides a screw feeding device parameter optimization test method and test device thereof, which can test different materials and obtain the coefficients related to the characteristics of each material, so as to calculate the reasonable parameter value in actual application.

[0004] Technical scheme: In order to achieve the above-mentioned purpose, the screw feeding device parameter optimization test method and test device thereof of the present application, through the test device, carries out conveying test on the selected material; the selected material is tested for multiple times, and the specific steps of each test are as follows:

[0005] Step one, according to the screw diameter value of the test device, the value range of the screw shaft rotation speed value and the pitch value is determined respectively;

[0006] Step two, the rotation speed value and the pitch value of the current test point are selected in the corresponding value range, and the corresponding parameters of the test device are adjusted to start the test; the test is completed after a certain feeding time T;

[0007] Step three, the output value Q n and the unit output energy consumption value P n are obtained after the test, wherein n is the test number;

[0008] Step four, by comparing the test results of the current test and the test results of the last test, the value range is gradually reduced to determine the optimal value interval E of the rotation speed value and the pitch value;

[0009] According to the optimal value interval E obtained from multiple tests, the reasonable A value and K1 value of the selected material are calculated by using the rotation speed formula of the screw shaft and the calculation formula of the screw pitch.

[0010] The rotation speed formula of the screw shaft is:

[0011]

[0012] The calculation formula of the screw pitch is:

[0013] s = K1D(m);

[0014] Wherein A is a coefficient related to the material characteristics, K1 is a proportional coefficient representing the relationship between the screw pitch and the screw diameter, v is the rotation speed value of the screw shaft, s is the screw pitch value, and D is the screw diameter.

[0015] Further, the determination method of the optimal value interval of the rotation speed value and the screw pitch value is:

[0016] Firstly, a plane rectangular coordinate system is established with the rotation speed value v of the screw shaft and the screw pitch value s as the coordinate axes, and then any one of the two values is selected as a constant value; the first selected value is the initial selected value, and the other value is the reselected value;

[0017] The constant value is the middle value X0 of the value range of the initial selected value, so that the optimal value interval E1 of the reselected value is obtained through testing;

[0018] Then, the middle value Y0 of the optimal value interval E1 is taken as the constant value, so that the optimal value interval E2 of the initial selected value is obtained through testing.

[0019] Further, the specific determination method of the optimal value interval E1 is:

[0020] Firstly, a first test point Z1(X0, Y1) is selected in the coordinate system, wherein Y1 is determined by using the golden ratio method; the corresponding parameters of the test device are adjusted by using X0 and Y1, and the initial parameter test results Q1 and P1 are obtained after testing;

[0021] Secondly, the symmetric point of the first test point Z1 is selected as a second test point Z2(X0, Y2) by taking y=Y4 as the symmetric line, wherein Y4 is the middle value of the value range of the reselected value; the corresponding parameters of the test device are adjusted by using X0 and Y2, and the parameter test results Q2 and P2 are obtained after testing;

[0022] By comparing Q2 and Q1, P2 and P1 respectively and comprehensively analyzing, the value range of the reselected value is reduced by taking Y2 as the range boundary, and the interval e1 is obtained;

[0023] Finally, Y3 is calculated by using the reduced value range, so that a third test point Z3(X0, Y3) is obtained, the corresponding parameters of the test device are adjusted by using X0 and Y3, and the parameter test results Q3 and P3 are obtained after testing;

[0024] By comparing Q3 and Q2, P3 and P2 respectively, and after comprehensive analysis, the value range of the reselected value is further narrowed with Y3 as the range boundary, so as to obtain the optimal value interval E1.

[0025] Further, the specific determination method of the optimal value interval E2 is as follows:

[0026] Firstly, a fourth test point Z4 (X1, Y0) is selected in the coordinate system, wherein X1 is determined by using the golden ratio method; the corresponding parameters of the test device are adjusted by using X1 and Y0, and the initial parameter test results Q4 and P4 are obtained after the test;

[0027] Secondly, the fifth test point Z5 (X2, Y0) is selected as the symmetric point of the fourth test point Z4 with x=X0 as the symmetric line; the corresponding parameters of the test device are adjusted by using X2 and Y0, and the parameter test results Q5 and P5 are obtained after the test;

[0028] By comparing Q5 and Q4, P5 and P4 respectively, and after comprehensive analysis, the value range of the reselected value is narrowed with X2 as the range boundary, so as to obtain the interval e2;

[0029] Finally, X3 is calculated in the narrowed value range, so as to obtain the sixth test point Z6 (X3, Y0); the corresponding parameters of the test device are adjusted by using X3 and Y0, and the parameter test results Q6 and P6 are obtained after the test;

[0030] By comparing Q6 and Q5, P6 and P5 respectively, and after comprehensive analysis, the value range of the reselected value is further narrowed with X3 as the range boundary, so as to obtain the optimal value interval E2.

[0031] Further, the calculation formulae of Y1 and X1 are as follows:

[0032] F (X1 / Y1) = (N max -N min ) × 0.618 + N min ;

[0033] Wherein, N max is the maximum end value of the corresponding value range, and N min is the minimum end value of the corresponding value range.

[0034] Further, the calculation formulae of Y3 and X3 are as follows:

[0035] Y3 = I max + I min -Y4;

[0036] Wherein, I max is the maximum end value of the interval e1, and I min is the minimum end value of the interval e1.

[0037] X3 = L max + L min - X0;

[0038] wherein, L max is the maximum end value of the interval e2, L min is the minimum end value of the interval e2.

[0039] Further, the spiral shaft connected to the speed regulating driving device is provided with a spiral structure assembly, the pitch of the spiral structure assembly is adjustable, the spiral structure assembly is provided with a conveying bin shell outside, the feeding port and the discharging port of the conveying bin shell are respectively arranged close to the adjusting end and the fixed end of the spiral structure assembly, the spiral structure assembly comprises a sheet spring, one end of the sheet spring is fixed to the spiral shaft, and the other end of the sheet spring is driven to slide relative to the spiral shaft through a pitch adjusting module.

[0040] Beneficial effects: the spiral feeding device parameter optimization test method and the test device thereof simulate the conveying results of each material under different parameters through the test device with the same proportion, obtain the optimal value interval through comparison, roughly calculate the coefficients related to the material characteristics, obtain the parameter calculation formula for each material, and thus the rotation speed and the pitch of the spiral feeder of other specifications can be analogically calculated in actual production, so that the yield is improved and the energy consumption is reduced. The test principle of the optimization method greatly reduces the test times, and the test process is simple and convenient. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 is a structural schematic diagram of the test device of an embodiment of the present application; Figure 1 Figure 2 is a test point selection coordinate system diagram of an embodiment of the present application.

[0042] Figure 3 is a structural schematic diagram of the test device of another embodiment of the present application; Figure 2 Figure 4 is a test point selection coordinate system diagram of another embodiment of the present application. DETAILED DESCRIPTION

[0043] The present application will be further described below in combination with the drawings.

[0044] Figure 1 is a structural schematic diagram of the test device of an embodiment of the present application; Figures 1-2 The spiral feeding device parameter optimization test method and the test device thereof, the selected material is conveyed through the test device; the selected material is tested for multiple times, and the specific steps of each test are as follows:

[0045] Step one, the value range of the rotation speed value and the pitch value of the spiral shaft is determined respectively according to the spiral diameter value of the test device;

[0046] Step two, the rotation speed value and the pitch value of the current test point are selected in the corresponding value range, and the corresponding parameters on the test device are adjusted to start the test; the test is completed after a certain feeding time T.

[0047] Step three, obtaining output value Q after test n and unit output energy consumption value P n wherein n is the test number;

[0048] Step four, gradually narrowing the value range by comparing the test results of the current test with the test results of the last test, so as to determine the optimal value interval E of the speed value and the pitch value;

[0049] According to the optimal value interval E obtained by multiple tests, the reasonable A value and K1 value of the selected material are calculated respectively by using the speed formula of the screw shaft and the calculation formula of the pitch;

[0050] The speed formula of the screw shaft is:

[0051]

[0052] The calculation formula of the pitch is:

[0053] s=K1D(m);

[0054] Wherein A is a coefficient related to the characteristics of the material, K1 is a proportional coefficient representing the relationship between the pitch and the screw diameter, v is the speed value of the pitch shaft, s is the pitch value, and D is the screw diameter.

[0055] Wherein, the determination method of the optimal value interval of the speed value and the pitch value:

[0056] First, a plane rectangular coordinate system is established with the speed value v of the screw shaft and the pitch value s as the coordinate axes, and then any one of the two values is selected as a constant value; the first selected value is the initial selected value, and the other value is the reselected value;

[0057] The constant value is the middle value X0 of the value range of the initial selected value, so as to obtain the optimal value interval E1 of the reselected value through test;

[0058] Then, the middle value Y0 of the optimal value interval E1 is taken as a constant value, so as to obtain the optimal value interval E2 of the initial selected value through test.

[0059] Wherein, the specific determination method of the optimal value interval E1:

[0060] First, a first test point Z1(X0, Y1) is selected in the coordinate system, wherein Y1 is determined by the golden ratio method; the corresponding parameters of the test device are adjusted by X0 and Y1, and the initial parameter test results Q1 and P1 are obtained after test;

[0061] Secondly, take y=Y4 as the symmetry line, select the symmetry point of the first test point Z1 as the second test point Z2 (X0, Y2); wherein Y4 is the median of the value range of the reselected value; adjust the corresponding parameters of the test device with X0 and Y2, and obtain the test results Q2 and P2 after the test;

[0062] By comparing Q2 and Q1, P2 and P1 respectively, and after comprehensive analysis, the value range of the reselected value is narrowed with Y2 as the range boundary, and the interval e1 is obtained;

[0063] Finally, Y3 is calculated in the narrowed value range, and the third test point Z3 (X0, Y3) is obtained, and the corresponding parameters of the test device are adjusted with X0 and Y3, and the test results Q3 and P3 are obtained after the test;

[0064] By comparing Q3 and Q2, P3 and P2 respectively, and after comprehensive analysis, the value range of the reselected value is further narrowed with Y3 as the range boundary, and the optimal value interval E1 is obtained.

[0065] The specific determination method of the optimal value interval E2 is:

[0066] Firstly, select the fourth test point Z4 (X1, Y0) in the coordinate system, wherein X1 is determined by the golden ratio method; adjust the corresponding parameters of the test device with X1 and Y0, and obtain the initial test results Q4 and P4 after the test;

[0067] Secondly, take x=X0 as the symmetry line, select the symmetry point of the fourth test point Z4 as the fifth test point Z5 (X2, Y0); adjust the corresponding parameters of the test device with X2 and Y0, and obtain the test results Q5 and P5 after the test;

[0068] By comparing Q5 and Q4, P5 and P4 respectively, and after comprehensive analysis, the value range of the initial selected value is narrowed with X2 as the range boundary, and the interval e2 is obtained;

[0069] Finally, X3 is calculated in the narrowed value range, and the sixth test point Z6 (X3, Y0) is obtained, and the corresponding parameters of the test device are adjusted with X3 and Y0, and the test results Q6 and P6 are obtained after the test;

[0070] By comparing Q6 and Q5, P6 and P5 respectively, and after comprehensive analysis, the value range of the reselected value is further narrowed with X3 as the range boundary, and the optimal value interval E2 is obtained.

[0071] The calculation formula of Y1 and X1 is:

[0072] F (X1 / Y1) = (N max -N min ) × 0.618 + N min ;

[0073] wherein N max is the maximum end value of the corresponding value range, N min is the minimum end value of the corresponding value range, F(X1 / Y1) is used to refer to the formula of Y1 or the formula of X1.

[0074] wherein the calculation formula of Y3 and X3 are respectively:

[0075] Y3 = I max + I min -Y4;

[0076] wherein I max is the maximum end value of the interval e1, I min is the minimum end value of the interval e1;

[0077] X3 = L max + L min -X0;

[0078] wherein L max is the maximum end value of the interval e2, L min is the minimum end value of the interval e2.

[0079] The test device comprises a screw shaft 2 connected to a speed regulating driving device 1, a screw structure assembly 3 is sleeved on the screw shaft 2, and the screw pitch of the screw structure assembly 3 is adjustably arranged; a conveying bin shell 4 is sleeved outside the screw structure assembly 3, and a feeding port 41 and a discharging port 42 of the conveying bin shell 4 are arranged close to the adjusting end and the fixed end of the screw structure assembly 3 respectively; the screw structure assembly 3 comprises a sheet-shaped spring 31, one end of the sheet-shaped spring 31 is fixedly connected to the screw shaft 2, and the other end of the sheet-shaped spring 31 is slidably arranged relative to the screw shaft 2 through a screw pitch adjusting module. Wherein the speed regulating driving device 1 and the screw shaft 2 are connected through a shaft coupling 6.

[0080] The existing screw feeder generally welds the screw blade with a fixed pitch on the screw shaft, and the pitch cannot be adjusted at will; if the existing screw feeder is used for testing, different screw blades with different pitches need to be welded on the screw shaft, or a plurality of screw feeders with different pitches are directly used when testing under different pitch conditions.

[0081] The scheme adopts a specially designed test device to perform simulation testing, adjusts the rotating speed of the screw shaft through the speed regulating driving device, and adjusts the screw pitch through the screw structure assembly; and the scheme adopts a sheet-shaped spring as the screw blade for conveying materials, that is, a helical elastic structure with a sheet-shaped structure, which can be manually or automatically driven to adjust the pitch at will, thereby greatly facilitating the testing and reducing the testing cost.

[0082] The leaf spring 31 has a rectangular cross-section, typically with an outer diameter less than 120 mm, while a regular spring has a circular cross-section. The leaf spring 31 resembles a small helical blade, which can transport materials when rotated.

[0083] Example 1:

[0084] The selected material is cement. Taking the conveying of cement as an example, the dimensions of the selected spiral structure component are: outer diameter 120mm, inner diameter 80mm, and length 1m. Based on experience and formula estimation, the pitch range is between 80-120mm, and the rotational speed of the spiral shaft ranges between 100-300r / min.

[0085] Cement density 1.25 t / m³ 3 By changing the screw pitch and rotation speed, the conveying capacity, i.e. the output, is measured in t / h; at the same time, the energy consumption per unit output is calculated in kWh / t. The screw pitch interval is set to 10mm and the rotation speed interval is set to 10r / min, which means there are 5 test values ​​for the screw pitch and 21 test values ​​for the rotation speed. According to the traditional test method, 105 tests are required, which is obviously a lot of work.

[0086] According to the test method in this plan, the specific test procedure is as follows:

[0087] The first step is to establish a planar coordinate system, with the rotational speed v as the x-axis and the interval value being 10 r / min; and the pitch s as the y-axis and the interval value being 10 mm.

[0088] The second step is to select the rotation speed as the initial value, and then the pitch value is the reselected value; therefore, X0 = 200 r / min, Y4 = 100 mm;

[0089] Therefore, the median rotation speed X0 = 200 r / min is taken, and Y1 = (120-80) × 0.618 + 80 ≈ 105 mm is calculated; thus, the first test point Z1 is (200, 105); then the test is carried out, the speed of the variable speed motor is adjusted to 200 r / min, the pitch value is adjusted to 105 mm, then cement is put into the feed port, the motor is started, the feeding time is set to T = 10 minutes, the output cement quantity is weighed, the average current value is measured with an ammeter, the average output power is calculated, the power consumption is calculated, and then converted into the energy consumption per unit output.

[0090] The test results are as follows: output Q1 = 5.9 t / h; energy consumption per unit output P1 = 0.07 kWh / t.

[0091] The third step is to take the graph of the equation of y=100 in the coordinate system as the axis of symmetry, select the symmetrical point of Z1(200,105) as the second test point Z2(200,95), that is, adjust the pitch value to 95mm.

[0092] The test results are as follows: yield Q2=5.2t / h; unit yield energy consumption P2=0.07kwh / t.

[0093] Comparing the results of the two tests, it is found that the yield decreases after the pitch value decreases, but the unit yield energy consumption hardly decreases, so the pitch range below 95mm is abandoned, thus the interval e1=[95,120], I max =120, I min =95.

[0094] In the fourth step, Y3=120+95-100=115mm is calculated in the pitch range of 95mm-120mm, and the third test point Z3(200,115) is obtained, i.e. the pitch value is adjusted to 115mm.

[0095] The test results are as follows: yield Q3=6.5t / h; unit yield energy consumption P3=0.065kwh / t.

[0096] Thus the optimal value E1 of the pitch is basically determined to be between 105-115mm.

[0097] In the fifth step, the median Y0=110mm of the optimal value E1 of the pitch is taken,

[0098] X1=(300-100)×0.618+100=225r / min is calculated; the fourth test point Z4(225,110) is obtained, i.e. the speed of the speed-regulating motor is adjusted to 225r / min and the pitch value is adjusted to 110mm.

[0099] The test results are as follows: Q4=7.1t / h; P4=0.078kwh / t.

[0100] In the sixth step, the symmetrical point of Z4(225,110) is selected as the fifth test point Z5(175,110) with x=200 as the symmetrical axis of the equation image in the coordinate system, i.e. the speed is adjusted to 175r / min.

[0101] The test results are as follows: Q5=5.3t / h; P5=0.065kwh / t.

[0102] After analysis, it is considered that the yield is still the main factor to be considered although the unit yield energy consumption slightly decreases at the fifth test point, so the speed range below 175r / min is abandoned, thus the interval e2=[175,300].

[0103] In the seventh step, X3=300+175-200=275r / min is calculated in the speed range of 175-300r / min, and Z6(275,110) is obtained, i.e. the speed is adjusted to 275r / min.

[0104] Test result: Q6 = 8.2 t / h; P6 = 0.10 kwh / t.

[0105] After analysis, at the sixth test point, although the output increases with the increase of the speed, the energy consumption per unit output increases more, so the speed range above 275 r / min is abandoned.

[0106] In the eighth step, through the above test, it can be preliminarily determined that the appropriate speed range should be between 225-275 r / min. Since the interval range is still large, the above steps can be repeated to further narrow down the value range; that is, the golden ratio method is used again to determine the seventh test point Z7; that is, X4 = (275-225) x 0.618 + 225 = 255 r / min; Z7 (255, 110) is obtained, that is, the speed is adjusted to 255 r / min.

[0107] Test result: Q7 = 7.6 t / h; P7 = 0.08 kwh / t.

[0108] After comprehensive comparison and analysis, the optimal value E2 of the speed is between 225-255 r / min.

[0109] The optimal value obtained by the test is substituted into the speed formula of the spiral shaft and the calculation formula of the pitch to calculate the reasonable A value and K1 value of the selected material.

[0110] When D = 0.12 m, v = 255 r / min, and s = 0.11 m, the optimal values A = 88 and K1 = 0.9 are calculated.

[0111] According to the theoretical calculation formula of the spiral feeder output Q = KD 2 vsψρ, unit t / h;

[0112] Wherein, ρ is the bulk density of the material, the unit is t / m3; ψ is the filling coefficient, generally 0.5-0.7; D is the spiral diameter, S is the pitch, unit m; K is the coefficient related to many factors such as material properties and spiral structure, generally the experience value.

[0113] Taking the spiral feeder with a spiral diameter of 300 mm commonly used in actual production as an example, the speed v = 160 r / min and the pitch s = 270 mm are calculated according to the optimal value. The recommended speed v = 80 r / min and the pitch s = 240 mm of the existing data spiral feeder. Obviously, the speed and pitch recommended by the existing data are lower than the optimal value. The theoretical formula shows that the output and the speed and the pitch are proportional. After increasing the design speed and the pitch, the output can be increased by more than 80% in theory.

[0114] Example two:

[0115] The one end of the sheet spring 31 is fixed to the disc 21 at the end of the screw shaft, and the disc 21 is sleeved on the screw shaft; the other end of the sheet spring is movably arranged, and the movable end of the sheet spring is arranged on the end surface of the movable pressing sleeve 32; the movable pressing sleeve 32 is movably sleeved on the screw shaft, and the movable pressing sleeve 32 is adjusted to slide along the screw shaft in the axial direction by the pitch adjusting module, so that the pitch of the sheet spring 31 is changed, so as to achieve the purpose of adjusting the pitch.

[0116] When the pitch is adjusted, in order to prevent the screw shaft 2 from rotating, the positioning pin is inserted into the positioning hole 22 at both ends, so that the screw shaft 2 is fixed on the rack.

[0117] As shown in Figure 1 The both ends of the screw shaft are supported by the bearing 5 with seat and arranged horizontally and transversely; the right end of the screw shaft 2 is provided with a screw rod, the thread of the screw rod is threadedly connected with the hexagonal nut 33 to form the pitch adjusting module; the left side of the hexagonal nut 33 is the movable pressing sleeve 32, and the movable pressing sleeve 32 and the screw rod are gap-fitted; the right side of the screw shaft 2 is the polished rod, and the sheet spring 31 is sleeved on the polished rod; during the test, the rotating speed of the screw shaft is adjusted by the speed regulating motor, and the adjustment of the pitch is realized by screwing the hexagonal nut.

[0118] Of course, the pitch adjusting and driving module can also use automatic moving equipment to drive the sliding movement of the movable pressing sleeve relative to the screw shaft, so that the pitch adjustment is more convenient, fast and accurate.

[0119] The both ends of the conveying bin shell 4 are respectively provided with end covers 43, one side end cover is abutted with the disc 21, and the other side end cover is slidably sleeved with the movable pressing sleeve 32.

[0120] The above description is only the preferred embodiment of the present application, and it should be pointed out that: for ordinary skilled in the art, without departing from the above-mentioned principles of the present application, a number of improvements and refinements can also be made, and these improvements and refinements are also regarded as the protection scope of the present application.

Claims

1. A method of parameter optimization test for a screw feeder, characterized by: The selected material is tested by the testing device; the selected material is tested for multiple times, and the specific steps of each test are as follows: Step one, according to the helical diameter value of the testing device, the value range of the helical shaft speed value and the pitch value is determined respectively; Step two, the speed value and the pitch value of the current test point are selected in the corresponding value range, and the corresponding parameters of the testing device are adjusted to start the test; the test is completed after a certain feeding time T; Step three, obtain the output value Q after the test n and the unit output energy consumption value P n where n is the test number; Step four, by comparing the test results of the current test with the test results of the last test, the value range is gradually reduced to determine the optimal value interval E of the speed value and the pitch value; According to the optimal value interval E obtained by multiple tests, the reasonable A value and K1 value of the selected material are calculated by using the speed formula of the helical shaft and the calculation formula of the pitch; The speed formula of the helical shaft is: The calculation formula of the pitch is: s = K1D(m); Wherein A is a coefficient related to the characteristics of the material, K1 is a proportional coefficient representing the relationship between the pitch and the helical diameter, v is the speed value of the pitch shaft, s is the pitch value, and D is the helical diameter; The determination method of the optimal value interval of the speed value and the pitch value: First, a plane rectangular coordinate system is established with the helical shaft speed value v and the pitch value s as the coordinate axes, and then any one of the two values is selected as a constant value; The first selected value is the initial selected value, and the other value is the reselected value; The constant value is the middle value X0 of the value range of the initial selected value, and the optimal value interval E1 of the reselected value is obtained by testing; Then take the middle value Y0 of the optimal value interval E1 as the constant value, and the optimal value interval E2 of the initial selected value is obtained by testing; The specific determination method of the optimal value interval E1: First, select the first test point Z1(X0, Y1) in the coordinate system, wherein Y1 is determined by the golden ratio method; adjust the corresponding parameters of the testing device with X0 and Y1, and obtain the initial parameter test results Q1 and P1 after testing; Second, select the symmetric point of the first test point Z1 as the second test point Z2(X0, Y2) with y=Y4 as the symmetric line; wherein Y4 is the middle value of the value range of the reselected value; adjust the corresponding parameters of the testing device with X0 and Y2, and obtain the parameter test results Q2 and P2 after testing; By comparing Q2 and Q1, P2 and P1 respectively, and comprehensively analyzing, the value range of the reselected value is reduced with Y2 as the range boundary to obtain the interval e1; finally, Y3 is calculated in the reduced value range; Y3 = I max + I min - Y4; where I max is the maximum end value of the interval e1, I min is the minimum end value of the interval e1; Thus, the third test point Z3(X0, Y3) is obtained, the corresponding parameters of the testing device are adjusted with X0 and Y3, and the parameter test results Q3 and P3 are obtained after testing; By comparing Q3 and Q2, P3 and P2 respectively, and comprehensively analyzing, the value range of the reselected value is further reduced with Y3 as the range boundary, and the optimal value interval E1 is obtained.

2. A method of parameter optimization test for a screw feeder according to claim 1, characterized in that: The specific determination method of the optimal value interval E2: First, select the fourth test point Z4(X1, Y0) in the coordinate system, wherein X1 is determined by the golden ratio method; adjust the corresponding parameters of the testing device with X1 and Y0, and obtain the initial parameter test results Q4 and P4 after testing; Secondly, taking x=X0 as the symmetry line, the fifth test point Z5(X2, Y0) is selected as the symmetry point of the fourth test point Z4; the corresponding parameters of the test device are adjusted by X2 and Y0, and the test results Q5 and P5 are obtained after the test; By comparing Q5 and Q4, P5 and P4 respectively, and then analyzing comprehensively, the value range of the initial selected value is narrowed by taking X2 as the range boundary, and the interval e2 is obtained; Finally, the value range of the initial selected value is narrowed, and X3 is obtained by calculation, so as to obtain the sixth test point Z6(X3, Y0); the corresponding parameters of the test device are adjusted by X3 and Y0, and the test results Q6 and P6 are obtained after the test; By comparing Q6 and Q5, P6 and P5 respectively, and then analyzing comprehensively, the value range of the reselected value is further narrowed by taking X3 as the range boundary, so as to obtain the optimal value interval E2.

3. A method of parameter optimization test of a screw feeder according to claim 2, characterized in that: The calculation formula of Y1 and X1 is: F(X1 / Y1) = (N max - N min ) x 0.618 + N min ; where N max is the maximum end value of the corresponding value range, N min is the minimum end value of the corresponding value range.

4. A method of parameter optimization test of a screw feeder according to claim 3, characterized in that: The calculation formula of X3 is: X3= L max +L min -X0; where L max is the maximum end value of the interval e2, L min is the minimum end value of the interval e2.

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