Material crushing device, crushed block particle size statistical method and crushing degree adjusting method

Abstract

The invention relates to the technical field of material crushing, in particular to a material crushing device, a fragment particle size statistical method and a crushing degree adjusting method. Comprising a crushing cutter assembly used for crushing materials, a sagger used for containing the materials is arranged below the crushing cutter assembly, and the rotary crushing end of the crushing cutter assembly can repeatedly stretch into the sagger to crush the materials. By means of the device, the material crushing efficiency can be effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of material crushing, and in particular to a material crushing device, a method for counting particle sizes of broken pieces, and a method for adjusting the degree of crushing. Background Art

[0002] At present, the ternary positive electrode materials undergo high-temperature sintering in a roller kiln to produce a solid-phase chemical reaction. The sintered materials generally become hardened and compacted. The agglomerated materials need to be broken up, and the particle size of the output material must meet the process standard requirements.

[0003] At present, the commonly used equipment on the market has the following problems:

[0004] 1. The crushing equipment has a single function.

[0005] 2. The particle size and crushing rhythm of the discharged material are uncontrollable, which brings great difficulties to the subsequent processing process.

[0006] It can be seen that the current crushing equipment is difficult to accurately detect the particle size distribution of the material after crushing, and cannot timely optimize and adjust the control parameters of the crushing process, which leads to the inability to further improve the crushing efficiency of the material and achieve energy conservation and emission reduction effects. Therefore, it is urgent to solve this problem. Summary of the invention

[0007] In order to avoid and overcome the technical problems existing in the prior art, the present invention provides a material crushing device, a method for calculating the particle size of crushed pieces, and a method for adjusting the crushing degree. The device of the present invention can effectively improve the crushing efficiency of materials.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] A material crushing device comprises a crushing tool assembly for crushing materials, a sagger for containing materials is arranged below the crushing tool assembly, and a rotating crushing end of the crushing tool assembly can repeatedly extend into the sagger to crush the materials.

[0010] As a further solution of the present invention: the crushing tool assembly includes a plurality of rotating cutter discs, and each rotating cutter disc includes an axially vertically arranged rotating shaft, and a main cutting edge installed at the bottom end of the rotating shaft, and each main cutting edge is evenly distributed in sequence around the rotating shaft.

[0011] As a further solution of the present invention: there are five groups of rotating cutter discs, and the four groups located on the outside are symmetrically distributed with the axis of the rotating shaft of the middle group as the symmetry axis; the top ends of the rotating shafts of the four groups of rotating cutter discs on the outside are coaxially fixed with driven gears, and the top end of the rotating shaft of the middle group of rotating cutter discs is coaxially fixed with a driving gear, and the four driven gears are all meshed with the driving gear for transmission.

[0012] As a further solution of the present invention: the rotating shaft of the middle group of rotating cutter discs passes through the driving gear and is connected to the power mechanism through a belt transmission structure.

[0013] As a further solution of the present invention: a telescopic part which can drive the sagger to reciprocate in a vertical direction is installed at the bottom of the sagger, the telescopic part includes an eccentric circular wheel with a horizontally arranged rotation axis, a guide sleeve which is axially arranged vertically is fixedly provided above the eccentric circular wheel, a guide shaft is coaxially inserted in the guide sleeve, and the sagger is fixedly installed on the top of the guide shaft; a roller is rotatably installed at the bottom of the guide shaft, and the wheel surface of the roller forms a rolling fit with the wheel surface of the eccentric circular wheel; when the roller is in the highest position, the rotating cutter disc is inserted into the material in the sagger; when the roller is in the lowest position, the rotating cutter disc and the material in the sagger are separated from each other.

[0014] As a further solution of the present invention: the moving speed of the sagger in the vertical direction is expressed as follows:

[0015]

[0016] Wherein, u(ω) represents the moving speed of the sagger in the vertical direction; e represents the eccentricity of the eccentric wheel; ω represents the rotation speed of the eccentric wheel; t represents time; R represents the radius of the eccentric wheel; cos represents the cosine function; and sin represents the sine function.

[0017] As a further solution of the present invention: the cutting speed of the rotating cutter disc is calculated as follows:

[0018]

[0019] Wherein, v1 represents the cutting speed of the rotating cutter disc in the middle; v2 represents the cutting speed of the rotating cutter discs located on the periphery; s represents the reduction ratio between the driving gear and the driven gear; D represents the diameter of the rotating cutter disc; and n represents the rotation speed of the rotating cutter disc in the middle.

[0020] As a further solution of the present invention: the displacement height of the sagger is calculated as follows:

[0021]

[0022] Where, L(ωt) represents the displacement height of the sagger at time t;

[0023] A method for counting particle sizes of broken pieces, the method for counting particle sizes of broken pieces using the above-mentioned material crushing device, comprises the following counting steps:

[0024] S1, obtaining the original image of the topmost fragments in the sagger at the current degree of fragmentation in real time;

[0025] S2, calculate the average gray value F(x,y) of each pixel in the original image;

[0026]

[0027] Where, F(x,y) represents the average gray value of the pixel (x,y); R(x,y) represents the gray value of the pixel (x,y) in the red channel; G(x,y) represents the gray value of the pixel (x,y) in the green channel; B(x,y) represents the gray value of the pixel (x,y) in the blue channel;

[0028] S3, calibrate the initial threshold T1 used to distinguish between fragments and background;

[0029]

[0030] In the formula, F max (x, y) represents the maximum average gray value in the original image; F min (x,y) represents the minimum average gray value in the original image;

[0031] S4, storing the average grayscale value of the original image that is greater than or equal to the initial threshold value T1 in the background database, and storing the average grayscale value of the original image that is less than the initial threshold value T1 in the fragment database;

[0032] S5, calculating the average of the average grayscale values ​​in the background database, and calculating the average of the average grayscale values ​​in the fragment database, and combining them to form a new threshold value T2;

[0033]

[0034] Where, F1(x,y) represents the average value of the average grayscale value in the background database; F2(x,y) represents the average value of the average grayscale value in the fragment database;

[0035] S6, replace the initial threshold with the new threshold, and repeat steps S4 and S5 until |T i+1 -T i |≤ΔT, at this time, the distinction threshold T=T i+1 ; T i+1 represents the threshold obtained in the i+1th iteration, T i represents the threshold obtained in the i-th iteration, and ΔT represents the threshold error;

[0036] S7, using an edge detection operator to sharpen the original image, and performing binary classification on the original image after the sharpening process, that is, when the average gray value of the pixel in the original image after the sharpening process is greater than or equal to the discrimination threshold T, the gray value of the pixel is recorded as 0; otherwise, it is recorded as 255; and the original image at this time is recorded as a black and white image;

[0037] S8. Each white area in the black-and-white image represents a fragment. The maximum distance d between any two pixels in each fragment of the black-and-white image is calculated. j,max ; At the same time, set the distance threshold d and the maximum distance d j,max The fragments that are greater than or equal to the distance threshold d are recorded as larger fragments and stored in the larger fragment database;

[0038] S9, counting the total number of each larger fragment in the larger fragment database, and based on the total number, calculating the proportion of each maximum distance in the larger fragment database;

[0039]

[0040] In the formula, represents the kth maximum distance d in the larger fragment database k The proportion in the larger fragment database; N represents the total number of larger fragments in the larger fragment database; n k represents the kth maximum distance d in the larger fragment database k Total number in the larger fragment database.

[0041] A method for adjusting the degree of crushing, the method for adjusting the degree of crushing applying the above-mentioned method for calculating the particle size of the fragments, comprises the following adjustment steps:

[0042] A1. Count the sum of the probability of each maximum distance smaller than the set particle size d0 in the database of larger fragments;

[0043]

[0044] In the formula, The sum of the probabilities of occurrence of each maximum distance smaller than the set particle size d0 in the larger fragment database; N1 represents the total number of categories of the maximum distance in the larger fragment database;

[0045] A2. Based on the adjustment principle, determine whether adjustment is needed;

[0046] when If the current crushing result meets the requirements, the material crushing device stops running;

[0047] when It is judged that the current crushing result does not meet the requirements, and the moving speed of the sagger and the rotating speed of the rotating cutter disc need to be adjusted as follows:

[0048]

[0049] Where, Δω represents the current speed change of the eccentric wheel; T represents the original image sampling period;

[0050]

[0051] In the formula, Δn represents the current rotation speed change of the rotating cutter disc located in the middle as a further solution of the present invention:.

[0052] Compared with the prior art, the present invention has the following beneficial effects:

[0053] 1. The material crushing device is cleverly designed to combine the crushing tool assembly with the sagger, so that the rotating crushing end of the crushing tool assembly can repeatedly extend into the sagger to crush the material efficiently. This design not only improves the continuity of the crushing process, but also ensures the uniformity of the crushing effect. Since the crushing tool assembly can directly act on the material in the sagger, the time for material transmission and repositioning is reduced, thereby significantly improving the overall crushing efficiency of the material and laying a solid foundation for subsequent processing.

[0054] 2. The crushing tool assembly adopts a design of multiple rotating cutter discs, and the main cutting edges on each rotating cutter disc are evenly distributed around the rotating shaft. This structure makes the crushing process more delicate and comprehensive. The axially vertically arranged rotating shaft ensures that the cutting edge can maintain a stable cutting angle during crushing, improving the accuracy and efficiency of crushing. At the same time, the design of multiple cutter discs also increases the coverage of crushing, so that the material can be more fully crushed in a shorter time, further improving the overall work efficiency.

[0055] 3. The axially symmetrical distribution design of the five rotating cutter discs and the meshing transmission of the driven gear and the driving gear realize the coordinated work of the crushing tool assembly. This layout not only makes the crushing force more balanced and avoids local overload, but also improves the stability and reliability of crushing through gear transmission. The design of the driving gear in the middle group simplifies the transmission structure, facilitates maintenance and debugging, and also improves the efficiency of the transmission.

[0056] 4. The rotating shaft of the middle set of rotating cutter discs is connected to the power mechanism through a belt drive structure. This transmission method has the advantages of simple structure, stable transmission and low noise. The belt drive can also play a certain buffering role, reducing the direct impact of the power mechanism on the crushing tool assembly and extending the service life of the equipment. At the same time, the easy maintenance of the belt drive also reduces the maintenance cost of the equipment and improves the overall cost performance of the equipment.

[0057] 5. The telescopic part installed at the bottom of the sagger enables the sagger to move back and forth in the vertical direction. This design cleverly realizes the periodic contact and separation between the rotating cutter disc and the material in the sagger. When the roller is at the highest position, the rotating cutter disc is inserted into the sagger for crushing; when the roller is at the lowest position, the rotating cutter disc is separated from the material, which is convenient for discharging and preparing for the next crushing. This reciprocating movement not only improves the flexibility of crushing, but also avoids the overheating and wear problems that may be caused by continuous crushing, ensuring the stability and continuity of the crushing process. At the same time, the structural design of the telescopic part also facilitates the adjustment of the crushing depth and frequency according to actual needs, meeting the crushing needs of different materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] Figure 1 It is a schematic diagram of the structure of the device in the present invention.

[0059] Figure 2 It is a schematic diagram of the arrangement of the rotating cutter disc in the present invention.

[0060] Figure 3 It is a schematic diagram of the structure of the rotating cutter disc in the present invention.

[0061] Figure 4 It is the original image in the present invention.

[0062] Figure 5 This is the image after sharpening in the present invention.

[0063] Figure 6 It is a black and white image in the present invention.

[0064] Figure 7 This is a schematic diagram of the maximum distance marking in the present invention.

[0065] In the figure: 11, loading platform; 12, crushing tool assembly; 121, rotating cutter disc; 1211, main cutting edge; 1212, secondary cutting edge; 122, gear transmission mechanism; 123, belt transmission structure; 124, power mechanism; 13, cam motion mechanism; 131, linear motion guide mechanism; 132, eccentric circular wheel. DETAILED DESCRIPTION

[0066] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0067] See also Figure 1 , Figure 2 and Figure 3In an embodiment of the present invention, a material crushing device includes a loading platform 11, a crushing tool assembly 12 and a cam motion mechanism 13. The loading platform 11 is a thick nylon plate structure with a groove in the center of the nylon plate for clamping a limit sagger. At the same time, a common clamping tool can be set on the nylon plate to prevent the sagger from shifting during the crushing process.

[0068] The crushing tool assembly 12 includes a rotating cutter disc 121, a gear transmission mechanism 122, a belt drive structure 123 and a power mechanism 124. The rotating cutter disc 121 is arranged above the material according to five groups of requirements, and the cutter numbers are W1 to W5. At the same time, the central cutter disc rotates in the opposite direction to the surrounding cutter discs to reduce the blind spot of the cutter disc for material crushing. A plurality of main cutting edges 1211 and secondary cutting edges 1212 are arranged on the rotating cutter disc 121. The cutter disc diameter of the main cutting edge 1211 is D, which is used for large-area cutting of hardened and compacted materials. The secondary cutting edge 1212 is used to cut and squeeze large pieces of material into small pieces. At the same time, the hole at the secondary cutting edge 1212 takes into account the discharge function. The speed of the motor in the power mechanism 124 is n through the belt drive in the belt drive structure 123 to the central cutter disc, and the reduction ratio of the driving gear of the central cutter disc to the driven gear of the surrounding cutter discs is s. The cutting speed of the central cutter disc is v1; the cutting speed of the surrounding cutter discs is v2, then the cutter disc cutting speed satisfies the following relationship:

[0069]

[0070] The cam motion mechanism 13 includes a linear motion guide mechanism 131 and an eccentric wheel 132. The linear motion guide mechanism 131 includes a guide sleeve, a guide shaft and a roller. The roller and the eccentric wheel 132 are in contact with each other as a rolling pair to reduce impact and wear. The guide sleeve and the guide shaft can also be selected from standard product linear guides. The radius of the eccentric wheel 132 is R, the eccentric distance OA between the rotating shaft and the original wheel center is e, and the angle between OA and the horizontal direction is The rotation speed of the eccentric wheel 132 is ω, the movement time is t, and the movement distance of the guide mechanism is L, then the displacement speed of the sagger satisfies the following relationship:

[0071]

[0072] The displacement speed of the sagger is converted into the feed cutting and retracting turning speed of the crushing tool assembly 12:

[0073]

[0074] According to the principle of relative motion, the speed is converted to facilitate subsequent calculations.

[0075] A method for calculating particle size statistics of fragments comprises the following statistical steps:

[0076] S1. Obtain the original image of the topmost fragments in the sagger at the current degree of fragmentation in real time. The specific steps are as follows:

[0077] An industrial camera is used to collect the broken material fragments in the sagger according to the period T, and pre-process them. The area inside the sagger is retained as the target area, and the image of this area is generated into a standard image size: 1024px×1024px. The original image obtained is as follows Figure 4 shown.

[0078] S2, calculate the average gray value F(x,y) of each pixel in the original image;

[0079]

[0080] Where F(x,y) represents the average gray value of the pixel (x,y); R(x,y) represents the gray value of the pixel (x,y) in the red channel; G(x,y) represents the gray value of the pixel (x,y) in the green channel; B(x,y) represents the gray value of the pixel (x,y) in the blue channel.

[0081] S3, calibrate the initial threshold T1 used to distinguish between fragments and background;

[0082]

[0083] In the formula, F max (x, y) represents the maximum average gray value in the original image; F min (x,y) represents the minimum average gray value in the original image.

[0084] S4. The average grayscale values ​​in the original image that are greater than or equal to the initial threshold value T1 are stored in the background database, and the average grayscale values ​​in the original image that are less than the initial threshold value T1 are stored in the fragment database.

[0085] S5, calculating the average of the average grayscale values ​​in the background database, and calculating the average of the average grayscale values ​​in the fragment database, and combining them to form a new threshold value T2;

[0086]

[0087] Where F1(x, y) represents the average of the average grayscale values ​​in the background database; F2(x, y) represents the average of the average grayscale values ​​in the fragment database.

[0088] S6, replace the initial threshold with the new threshold, and repeat steps S4 and S5 until |T i+1 -T i |≤ΔT, at this time, the distinction threshold T=T i+1 ; T i+1represents the threshold obtained in the i+1th iteration, T i represents the threshold obtained in the i-th iteration, and ΔT represents the threshold error.

[0089] S7. Directional derivatives are used when extracting the contour information of fragmented materials. To solve the influence of noise and burrs on the edges of graphics, edge operators are used to smooth noise and sharpen burrs, so as to make the boundary between fragments and background clearer. Figure 5 The calculation of the edge operator is as follows:

[0090] F′ X (x,y)=F(x+1,y-1)-F(x-1,y-1)+F(x+1,y)-F(x-1,y)+F(x+1,y+1)-F(x-1,y+1);

[0091] F′ Y (x,y)=F(x-1,y+1)-F(x-1,y-1)+F(x,y+1)-F(x,y-1)+F(x+1,y+1)-F(x+1,y-1);

[0092] G[F(x,y)]=|F′ X (x,y)|+|F′ Y (x,y)|;

[0093] In the formula, F' X (x, y) represents the partial differential of the image gray value along the X-axis of the pixel coordinate system in the original image; F' Y (x,y) represents the partial differential of the image grayscale value along the Y axis of the pixel coordinate system in the original image; G[F(x,y)] represents the operator gradient. The +1 and -1 in the formula represent a displacement of one pixel.

[0094] The original image after sharpening is binarized and classified. That is, when the average gray value of the pixel in the original image after sharpening is greater than or equal to the discrimination threshold T, the gray value of the pixel is recorded as 0; otherwise, it is recorded as 255; and the original image at this time is recorded as a black and white image, such as Figure 6 shown.

[0095] S8. Each white area in the black-and-white image represents a fragment. The maximum distance d between any two pixels in each fragment of the black-and-white image is calculated. j,max ,like Figure 7 As shown. At the same time, set the distance threshold d and the maximum distance d j,max The fragments that are greater than or equal to the distance threshold d are recorded as larger fragments and stored in the larger fragment database;

[0096] S9, counting the total number of each larger fragment in the larger fragment database, and based on the total number, calculating the proportion of each maximum distance in the larger fragment database;

[0097]

[0098] In the formula, represents the kth maximum distance d in the larger fragment database k The proportion in the larger fragment database; N represents the total number of larger fragments in the larger fragment database; n k represents the kth maximum distance d in the larger fragment database k Total number in the larger fragment database.

[0099] A method for adjusting the degree of crushing includes the following adjustment steps:

[0100] A1. Count the sum of the probability of each maximum distance smaller than the set particle size d0 in the database of larger fragments;

[0101]

[0102] In the formula, The sum of the probabilities of occurrence of each maximum distance smaller than the set particle size d0 in the larger fragment database; N1 represents the total number of categories of the maximum distance in the larger fragment database.

[0103] A2. Based on the adjustment principle, determine whether adjustment is needed;

[0104] when If the current crushing result meets the requirements, the material crushing device stops running;

[0105] when It is determined that the current crushing result does not meet the requirements, and the moving speed of the sagger and the rotating speed of the rotating cutter disc 121 need to be adjusted as follows:

[0106]

[0107] Where, Δω represents the current rotation speed change of the eccentric wheel 132; T represents the original image sampling period;

[0108]

[0109] Wherein, Δn represents the current rotation speed change of the rotating cutter disc 121 located in the middle.

[0110] The specific adjustments are as follows:

[0111] when It is judged that the current crushing result does not meet the requirements, and the low-intensity crushing coefficient needs to be increased so that the crushing device can complete the complete crushing of the material within the cycle time. The speed of the eccentric wheel 132 increases by Δω 80％ , the center tool speed increases by Δn 80％ The adjusted moving speed and cutting speed are shown as follows:

[0112]

[0113] when It is judged that the current crushing result does not meet the requirements, and the medium-intensity crushing coefficient needs to be increased so that the crushing device can complete the complete crushing of the material within the cycle time. The speed of the eccentric wheel 132 increases by Δω 20％ , the center tool speed increases by Δn 20％ The adjusted moving speed and cutting speed are shown as follows:

[0114]

[0115] when It is judged that the current crushing result does not meet the requirements, and the high-intensity crushing coefficient needs to be increased so that the crushing device can complete the complete crushing of the material within the cycle time. The speed of the eccentric wheel 132 increases by Δω max , the center tool speed increases by Δn max The adjusted moving speed and cutting speed are shown as follows:

[0116]

[0117]

[0118] In summary, the material crushing device includes a loading platform 11, a crushing tool assembly 12 and a cam mechanism, wherein the loading platform 11 is used to carry and fix the sagger, and the crushing tool assembly 12 is arranged directly above the sagger. The crushing tool assembly 12 includes five groups of rotating cutter discs 121, which are used for rotating cutting of hardened and compacted materials, and cutting large pieces of material into small pieces; the lifting and lowering movement of the cam mechanism completes the feeding, cutting and turning of the deep material in the sagger by the rotating cutter disc 121; the method for detecting the particle size of the crushed product adopts an industrial camera to complete the periodic acquisition of the material image during the crushing process, identifies the broken material through an image detection algorithm, extracts the contour information of the broken material, and statistically distributes the particle size of the broken pieces in the image; the method for intelligently adjusting the crushing effect optimizes and adjusts the process control parameters of the material crushing device according to the distribution of the particle size of the broken pieces, so as to improve the crushing efficiency.

[0119] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A material crushing device, characterized in that: It comprises a crushing tool assembly (12) for crushing materials. A sagger for containing materials is arranged below the crushing tool assembly (12). The rotating crushing end of the crushing tool assembly (12) can repeatedly extend into the sagger to crush the materials.

2. A material crushing device according to claim 1, characterized in that: The crushing tool assembly (12) comprises a plurality of rotating cutter discs (121), and each rotating cutter disc (121) comprises an axially vertically arranged rotating shaft, and a main cutting edge (1211) installed at the bottom end of the rotating shaft, and each main cutting edge (1211) is evenly distributed in sequence around the circumference of the rotating shaft.

3. A material crushing device according to claim 2, characterized in that: There are five groups of rotating cutter discs (121), and the four groups located on the outer side are symmetrically distributed with the axis of the rotating shaft of the middle group as the symmetry axis; the top ends of the rotating shafts of the four groups of rotating cutter discs (121) on the outer side are all coaxially fixed with driven gears, and the top end of the rotating shaft of the middle group of rotating cutter discs (121) is coaxially fixed with a driving gear, and the four driven gears are all meshed with the driving gear for transmission.

4. A material crushing device according to claim 3, characterized in that: The rotating shaft of the middle set of rotating blade discs (121) passes through the driving gear and is connected to the power mechanism (124) through a belt transmission structure (123).

5. A material crushing device according to claim 4, characterized in that: A telescopic part capable of driving the sagger to reciprocate in a vertical direction is installed at the bottom of the sagger, the telescopic part comprises an eccentric wheel (132) with a horizontally arranged rotation axis, a guide sleeve arranged axially vertically is fixedly arranged above the eccentric wheel (132), a guide shaft is coaxially inserted in the guide sleeve, and the sagger is fixedly installed on the top of the guide shaft; a roller is rotatably installed at the bottom of the guide shaft, and the wheel surface of the roller forms a rolling fit with the wheel surface of the eccentric wheel (132); when the roller is in the highest position, the rotating cutter disc (121) is inserted into the material in the sagger; when the roller is in the lowest position, the rotating cutter disc (121) and the material in the sagger are separated from each other.

6. A material crushing device according to claim 5, characterized in that: The moving speed of the sagger in the vertical direction is expressed as follows: In the formula, u(ω) represents the moving speed of the sagger in the vertical direction; e represents the eccentricity of the eccentric circular wheel (132); ω represents the rotation speed of the eccentric circular wheel (132); t represents time; R represents the radius of the eccentric circular wheel (132); cos represents the cosine function; and sin represents the sine function.

7. A material crushing device according to claim 6, characterized in that: The cutting speed of the rotating cutter head (121) is calculated as follows: In the formula, v1 represents the cutting speed of the rotating cutter disc (121) located in the middle; v2 represents the cutting speed of the rotating cutter discs (121) located on the periphery; s represents the reduction ratio between the driving gear and the driven gear; D represents the diameter of the rotating cutter disc (121); and n represents the rotation speed of the rotating cutter disc (121) located in the middle.

8. A material crushing device according to claim 7, characterized in that: The displacement height of the sagger is calculated as follows: Where L(ωt) represents the displacement height of the sagger at time t.

9. A method for counting particle sizes of fragments, the method for counting particle sizes of fragments using a material crushing device as claimed in any one of claims 1 to 8, characterized in that: The statistical steps include: S1, obtaining the original image of the topmost fragments in the sagger at the current degree of fragmentation in real time; S2, calculate the average gray value F(x,y) of each pixel in the original image; Where, F(x,y) represents the average gray value of the pixel (x,y); R(x,y) represents the gray value of the pixel (x,y) in the red channel; G(x,y) represents the gray value of the pixel (x,y) in the green channel; B(x,y) represents the gray value of the pixel (x,y) in the blue channel; S3, calibrate the initial threshold T1 used to distinguish between fragments and background; In the formula, F max (x, y) represents the maximum average gray value in the original image; F min (x,y) represents the minimum average gray value in the original image; S4, storing the average grayscale value of the original image that is greater than or equal to the initial threshold value T1 in the background database, and storing the average grayscale value of the original image that is less than the initial threshold value T1 in the fragment database; S5, calculating the average of the average grayscale values ​​in the background database, and calculating the average of the average grayscale values ​​in the fragment database, and combining them to form a new threshold value T2; Where, F1(x,y) represents the average value of the average grayscale value in the background database; F2(x,y) represents the average value of the average grayscale value in the fragment database; S6, replace the initial threshold with the new threshold, and repeat steps S4 and S5 until |T i+1 -T i |≤ΔT, at this time, the distinction threshold T=T i+1 ; T i+1 represents the threshold obtained in the i+1th iteration, T i represents the threshold obtained in the i-th iteration, and ΔT represents the threshold error; S7, using an edge detection operator to sharpen the original image, and performing binary classification on the original image after the sharpening process, that is, when the average gray value of the pixel in the original image after the sharpening process is greater than or equal to the discrimination threshold T, the gray value of the pixel is recorded as 0; otherwise, it is recorded as 255; and the original image at this time is recorded as a black and white image; S8. Each white area in the black-and-white image represents a fragment. The maximum distance d between any two pixels in each fragment of the black-and-white image is calculated. j,max ; At the same time, set the distance threshold d and the maximum distance d i,max The fragments that are greater than or equal to the distance threshold d are recorded as larger fragments and stored in the larger fragment database; S9, counting the total number of each larger fragment in the larger fragment database, and based on the total number, calculating the proportion of each maximum distance in the larger fragment database; In the formula, represents the kth maximum distance d in the larger fragment database k The proportion in the larger fragment database; N represents the total number of larger fragments in the larger fragment database; n k represents the kth maximum distance d in the larger fragment database k Total number in the larger fragment database.

10. A method for adjusting the degree of crushing, the method for adjusting the degree of crushing applying the method for calculating the particle size of fragments as claimed in claim 9, characterized in that: The adjustment steps include the following: A1. Count the sum of the probability of each maximum distance smaller than the set particle size d0 in the database of larger fragments; In the formula, The sum of the probabilities of occurrence of each maximum distance smaller than the set particle size d0 in the larger fragment database; N1 represents the total number of categories of the maximum distance in the larger fragment database; A2. Based on the adjustment principle, determine whether adjustment is needed; when If the current crushing result meets the requirements, the material crushing device stops running; when It is determined that the current crushing result does not meet the requirements, and the moving speed of the sagger and the rotating speed of the rotary cutter disc (121) need to be adjusted as follows: Wherein, Δω represents the current rotation speed change of the eccentric wheel (132); T represents the original image sampling period; Wherein, Δn represents the current rotation speed change of the rotating cutter disc (121) located in the middle.

Images