Method and device for sorting copper and aluminum of waste lithium battery

Abstract

The invention discloses a waste lithium battery copper and aluminum sorting method and device, and relates to the technical field of waste lithium battery recycling, the waste lithium battery copper and aluminum sorting method comprises the steps that a first image and a second image are obtained through a control unit, and the control unit judges whether a first screened object in a first specific gravity screen is qualified or not according to color distribution of the first image; according to the color distribution of the second image, judging whether a second screened object in the second specific gravity sieve is qualified or not; and if the control unit judges that any one of the first screened object and the second screened object is unqualified, the excitation parameters of the first specific gravity sieve and the second specific gravity sieve and the parameters of the fan are directly controlled by the control unit, so that the adjusting efficiency is high, manual sorting, judgment and control are not needed, the labor cost is reduced, and the waste of materials is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of waste lithium battery recycling, and in particular to a method and device for separating copper and aluminum from waste lithium batteries. Background Art

[0002] There are more copper and aluminum in waste lithium-ion batteries. In order to recycle the copper and aluminum in waste lithium-ion batteries, the existing process is to physically crush and screen the remaining copper and aluminum materials, and send the copper and aluminum materials to grinding equipment for fine grinding and de-powdering, generating a large amount of copper and aluminum powder, and then send the copper and aluminum powder to the specific gravity separator for sorting. The purity of copper and aluminum is not high, which affects the recycling value.

[0003] After being sorted by the gravity separator, the traditional method of sorting copper and aluminum from waste lithium batteries is to sort through manual intervention, and make adjustments by observing the export situation of copper and aluminum. This method has low adjustment efficiency, cannot keep up with the changes in materials, and results in a lot of material waste. Summary of the invention

[0004] The main purpose of the present invention is to provide a method and device for sorting copper and aluminum from waste lithium batteries, aiming to solve the problem that the existing method for sorting copper and aluminum from waste lithium batteries is sorting through manual intervention and has low adjustment efficiency.

[0005] To achieve the above-mentioned object, the present invention proposes a method for separating copper and aluminum from waste lithium batteries, which is applied to a waste lithium battery copper and aluminum separation device, wherein the waste lithium battery copper and aluminum separation device comprises a first specific gravity screen, a second specific gravity screen fan and a control unit, wherein the fan is provided at the first specific gravity screen and the second specific gravity screen, a first image acquisition device is installed at the outlet of the first specific gravity screen, and a second image acquisition device is installed at the outlet of the second specific gravity screen; The method for separating copper and aluminum from waste lithium batteries comprises the following steps: The first image acquisition device acquires a first image at a screen surface of a first specific gravity screen, and the second image acquisition device acquires a second image at a screen surface of a second specific gravity screen; The control unit acquires a first image and a second image, and the control unit determines whether a first screened object in a first specific gravity screen is qualified according to a color distribution of the first image; and determines whether a second screened object in a second specific gravity screen is qualified according to a color distribution of the second image; If the control unit determines that either the first screened product or the second screened product is unqualified, the control unit controls the excitation parameters of the first specific gravity screen and the second specific gravity screen and controls the parameters of the fan.

[0006] In one embodiment, the control unit determines whether the first screened product in the first specific gravity screen is qualified according to the color distribution of the first image; and determines whether the second screened product in the second specific gravity screen is qualified according to the color distribution of the second image, including: The control unit calculates the first color distribution percentage and the second color percentage of the target area in the first image, compares the first color distribution percentage with the first preset percentage, and determines whether the first screened product in the first specific gravity screen is qualified; The control unit calculates the third color distribution percentage and the fourth color percentage of the target area in the second image, compares the fourth color distribution percentage with the second preset percentage, and determines whether the second screened product in the second specific gravity screen is qualified.

[0007] In one embodiment, the first preset percentage is 98.5%; the control unit calculates the first color distribution percentage and the second color percentage of the target area in the first image, compares the first color distribution percentage with the first preset percentage, and determines whether the first screened product in the first specific gravity screen is qualified, including: The first color of the first image is yellow, and the second color is gray; The control unit calculates the yellow distribution percentage and the gray percentage of the target area in the first image, compares the yellow distribution percentage with the first preset percentage, and if the yellow distribution percentage is greater than or equal to 98.2%, determines that the first screened product in the first specific gravity screen is qualified.

[0008] In one embodiment, the second preset percentage is 96.5%; the control unit calculates the third color distribution percentage and the fourth color percentage of the target area in the second image, compares the fourth color distribution percentage with the second preset percentage, and determines whether the second screened product in the second specific gravity screen is qualified, including: The third color of the second image is yellow, and the fourth color is gray; The control unit calculates the gray distribution percentage and the yellow percentage of the target area in the second image, compares the gray distribution percentage with the second preset percentage, and if the gray distribution percentage is greater than or equal to 96.5%, the second screened product in the second specific gravity screen is judged to be qualified.

[0009] In one embodiment, if the control unit determines that either the first screened product or the second screened product is unqualified, the control unit controls the excitation parameters of the first specific gravity screen and the second specific gravity screen and controls the parameters of the fan, including: If the control unit determines that the first sieve out is qualified and the second sieve out is unqualified, the excitation parameters of the two specific gravity screens are maintained between 28Hz and 32Hz, the parameters of the fan are adjusted, and the frequency is increased by 1Hz each time, and the photo sampling is performed again after the first preset time; If the control unit determines that the first sieve out is unqualified and the second sieve out is qualified, the excitation parameters of the two specific gravity screens are maintained between 28Hz and 32Hz, the parameters of the fan are adjusted, the frequency is reduced by 1Hz each time, and the photo sampling is performed again after the first preset time; If the control unit determines that the first screened product is qualified and the second screened product is qualified, the excitation parameters of the two specific gravity screens and the parameters of the fan are kept unchanged, and sampling is performed once after a second preset time for review.

[0010] In one embodiment, the waste lithium battery copper and aluminum sorting device further includes a transfer silo and a box vibrating screen, and the transfer silo is connected to the box vibrating screen; before the first image acquisition device acquires a first image at the screen surface of the first specific gravity screen, and the second image acquisition device acquires a second image at the screen surface of the second specific gravity screen, the steps include: Put the material into the transfer silo, and the material enters the box vibrating screen from the transfer silo; The box vibrating screen vibrates, and the box vibrating screen is provided with a screen structure to perform particle size sorting, the screened material enters the first specific gravity screen and screens out the first screened material, and the screened material enters the second specific gravity screen and screens out the second screened material.

[0011] In one embodiment, the step of putting the material into the transfer silo and the material entering the box vibrating screen from the transfer silo includes: The transfer silo is provided with a material level device. When the material storage volume of the transfer silo reaches the starting material level of the material level device, the gate of the transfer silo opens and the material enters the box vibrating screen.

[0012] In one embodiment, the waste lithium battery copper and aluminum sorting device further includes a diverter, a tubular vibrating conveyor, a discharging bin, a screw conveyor, a collecting mechanism and an air flow conveying device, wherein the inlet end of the tubular vibrating conveyor is connected to the diverter, the outlet end is connected to the discharging bin and the screw conveyor, the outlet of the screw conveyor is connected to the collecting mechanism, and the air flow conveying device is connected to the transfer bin; If the control unit determines that either the first screened product or the second screened product is unqualified, after the step of controlling the excitation parameters of the first specific gravity screen and the second specific gravity screen and the parameters of the fan, the method comprises: The switching mechanism is started, and the material enters the tubular vibrating conveyor from the diversion device; The tubular vibrating conveyor conveys the qualified first screened material and the qualified second screened material to the discharge bin, and the screw conveyor conveys the qualified first screened material and the qualified second screened material to the collecting mechanism for collection; The air flow conveying device pumps the unqualified first screened material and the unqualified second screened material back to the transfer silo through the pipeline for cyclic screening.

[0013] The present invention also proposes a waste lithium battery copper and aluminum sorting device, comprising a first specific gravity screen, a second specific gravity screen, a fan and a control unit, wherein the fan is arranged on the first specific gravity screen and the second specific gravity screen, a first image acquisition device is installed at the outlet of the first specific gravity screen, and a second image acquisition device is installed at the outlet of the second specific gravity screen.

[0014] In one embodiment, the waste lithium battery copper and aluminum separation device further comprises a transfer silo and a box vibrating screen, wherein the transfer silo is connected to the box vibrating screen; The waste lithium battery copper and aluminum sorting device also includes a diverter device, a tubular vibrating conveyor, a discharge silo, a screw conveyor, a collecting mechanism and an air flow conveying device. The inlet end of the tubular vibrating conveyor is connected to the diverter device, and the outlet end is connected to the discharge silo and the screw conveyor. The outlet of the screw conveyor is connected to the collecting mechanism, and the air flow conveying device is connected to the transfer silo.

[0015] The technical solution of the present invention collects a first image at the screen surface of the first specific gravity screen by a first image acquisition device, and collects a second image at the screen surface of the second specific gravity screen by a second image acquisition device; then the first image and the second image are obtained by a control unit, and the control unit judges whether the first screened material in the first specific gravity screen is qualified according to the color distribution of the first image; and judges whether the second screened material in the second specific gravity screen is qualified according to the color distribution of the second image; if the control unit judges that either the first screened material or the second screened material is unqualified, the control unit controls the excitation parameters of the first specific gravity screen and the second specific gravity screen and the parameters of the control fan. Since the control unit can judge whether the first screened material and the second screened material are qualified according to the color distribution of the first image and the color distribution of the second image, and then can control the excitation parameters of the first specific gravity screen and the second specific gravity screen and the parameters of the control fan, the efficiency of adjusting the parameters is fast, no manual sorting, judgment and control are required, the labor cost is reduced, and the waste of materials is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0017] Figure 1 A schematic diagram of a process flow of an embodiment of a method for separating copper and aluminum from waste lithium batteries provided by the present invention; Figure 2 A simplified schematic diagram of a process for separating copper and aluminum from waste lithium batteries according to an embodiment of the present invention; Figure 3 A schematic structural diagram of an embodiment of a waste lithium battery copper and aluminum separation device provided by the present invention; Figure 4 A side view of an embodiment of a copper-aluminum separation device for waste lithium batteries provided by the present invention; Figure 5 A schematic diagram of an embodiment of the copper and aluminum separation method for waste lithium batteries provided by the present invention, from qualified copper powder and unqualified aluminum powder to qualified copper powder and qualified aluminum powder; Figure 6 This is a schematic diagram of an embodiment of the copper and aluminum separation method for waste lithium batteries provided by the present invention, from unqualified copper powder and qualified aluminum powder to qualified copper powder and qualified aluminum powder.

[0018] Description of Figure Numbers: 100. Copper and aluminum sorting device for waste lithium batteries; 1. Transfer silo; 2. Box vibrating screen; 30. First specific gravity screen; 31. Second specific gravity screen; 40. First image acquisition device; 41. Second image acquisition device; 5. Diverter device; 6. Tubular vibrating conveyor; 7. Screw conveyor; 8. Airflow conveying device; 9. Fan.

[0019] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0020] 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.

[0021] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0022] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0023] There are more copper and aluminum in waste lithium-ion batteries. In order to recycle the copper and aluminum in waste lithium-ion batteries, the existing process is to physically crush and screen the remaining copper and aluminum materials, and send the copper and aluminum materials to grinding equipment for fine grinding and de-powdering, generating a large amount of copper and aluminum powder, and then send the copper and aluminum powder to the specific gravity separator for sorting. The purity of copper and aluminum is not high, which affects the recycling value.

[0024] After being sorted by the gravity separator, the traditional method of sorting copper and aluminum from waste lithium batteries is to sort through manual intervention, and make adjustments by observing the export situation of copper and aluminum. This method has low adjustment efficiency, cannot keep up with the changes in materials, and results in a lot of material waste.

[0025] The present invention provides a method for separating copper and aluminum from waste lithium batteries. Figures 1 to 3 In one embodiment of the present invention, a method for separating copper and aluminum from waste lithium batteries proposed by the present invention is applied to a waste lithium battery copper and aluminum separation device 100, wherein the waste lithium battery copper and aluminum separation device 100 comprises a first specific gravity screen 30, a second specific gravity screen 31, a fan 9 and a control unit, wherein the fan 9 is provided at the first specific gravity screen 30 and the second specific gravity screen 31, a first image acquisition device 40 is installed at the outlet of the first specific gravity screen 30, and a second image acquisition device 41 is installed at the outlet of the second specific gravity screen 31; The method for separating copper and aluminum from waste lithium batteries comprises the following steps: S10: The first image acquisition device 40 acquires a first image at the screen surface of the first specific gravity screen 30, and the second image acquisition device 41 acquires a second image at the screen surface of the second specific gravity screen 31; S20: The control unit acquires the first image and the second image, and determines whether the first screened material in the first specific gravity screen 30 is qualified according to the color distribution of the first image; and determines whether the second screened material in the second specific gravity screen 31 is qualified according to the color distribution of the second image; S30: If the control unit determines that either the first screened product or the second screened product is unqualified, the control unit controls the excitation parameters of the first specific gravity screen 30 and the second specific gravity screen 31 and controls the parameters of the fan 9.

[0026] Specifically, the first image acquisition device 40 and the second image acquisition device 41 are both CCD cameras. Figure 1 and Figure 3 The first image acquisition device 40 and the second image acquisition device 41 are respectively installed at the outlet of the first specific gravity screen 30 and the outlet of the second specific gravity screen 31. The first image acquisition device 40 acquires images of the screen surface of the first specific gravity screen 30, and analyzes the images after acquisition, and then the control unit can control the excitation parameters of the first specific gravity screen 30 and the parameters of the fan 9. Similarly, the second image acquisition device 41 acquires images of the screen surface of the second specific gravity screen 31, and analyzes the images after acquisition, and then the control unit can control the excitation parameters of the first specific gravity screen 30 and the parameters of the fan 9.

[0027] Since the control unit can judge whether the first sieved product and the second sieved product are qualified according to the color distribution of the first image and the color distribution of the second image, and then control the excitation parameters of the first specific gravity screen 30 and the second specific gravity screen 31 and the parameters of the fan 9, the efficiency of adjusting the parameters is fast, and no manual sorting, judgment and control are required, which reduces labor costs and reduces material waste. And by controlling the excitation parameters of the two specific gravity screens and the parameters of the fan 9 by the control unit, the sorting effect can be corrected, thereby improving the purity of the first sieved product and the second sieved product.

[0028] The existing image recognition technology may be used to analyze the distribution of each color in the first image and the second image to obtain the distribution percentage of each color.

[0029] In one embodiment, the control unit determines whether the first screened material in the first specific gravity screen 30 is qualified according to the color distribution of the first image; and determines whether the second screened material in the second specific gravity screen 31 is qualified according to the color distribution of the second image, including: The control unit calculates the first color distribution percentage and the second color percentage of the target area in the first image, compares the first color distribution percentage with the first preset percentage, and determines whether the first screened product in the first specific gravity screen 30 is qualified; The control unit calculates the third color distribution percentage and the fourth color percentage of the target area in the second image, compares the fourth color distribution percentage with the second preset percentage, and determines whether the second screened product in the second specific gravity screen 31 is qualified.

[0030] Specifically, the first sieved product is copper powder, and the second sieved product is aluminum powder. The first preset percentage can be set to 98.8%; the second preset percentage can be set to 97.6%. Alternatively, the first preset percentage can be set to 98.2%; the second preset percentage can be set to 96.7%.

[0031] In one embodiment, since the first sieved material is copper powder, and the color of copper powder is mainly yellow, in order to determine whether the first sieved material is qualified, the first preset percentage is set to 98.5%; the control unit calculates the first color distribution percentage and the second color percentage of the target area in the first image, compares the first color distribution percentage with the first preset percentage, and determines whether the first sieved material in the first specific gravity screen 30 is qualified, including: The first color of the first image is yellow, and the second color is gray; The control unit calculates the yellow distribution percentage and the gray percentage of the target area in the first image, compares the yellow distribution percentage with the first preset percentage, and if the yellow distribution percentage is greater than or equal to 98.2%, the first screened material in the first specific gravity screen 30 is judged to be qualified.

[0032] Furthermore, in one embodiment, since the second screened product is aluminum powder, and the color of aluminum powder is mainly yellow, in order to determine whether the second screened product is qualified, the second preset percentage is set to 96.5%; the control unit calculates the third color distribution percentage and the fourth color percentage of the target area in the second image, compares the fourth color distribution percentage with the second preset percentage, and determines whether the second screened product in the second specific gravity screen 31 is qualified, including: The third color of the second image is yellow, and the fourth color is gray; The control unit calculates the gray distribution percentage and the yellow percentage of the target area in the second image, compares the gray distribution percentage with the second preset percentage, and if the gray distribution percentage is greater than or equal to 96.5%, the second screened material in the second specific gravity screen 31 is judged to be qualified.

[0033] In one embodiment, if the control unit determines that either the first screened product or the second screened product is unqualified, the control unit controls the excitation parameters of the first specific gravity screen 30 and the second specific gravity screen 31 and the steps of controlling the parameters of the fan 9, including: If the control unit determines that the first sieve out is qualified and the second sieve out is unqualified, the excitation parameters of the two specific gravity screens are maintained between 28Hz and 32Hz, the parameters of the fan 9 are adjusted, and the frequency is increased by 1Hz each time, and the photo sampling is performed again after the first preset time; If the control unit determines that the first sieve out is unqualified and the second sieve out is qualified, the excitation parameters of the two specific gravity screens are maintained between 28Hz and 32Hz, the parameters of the fan 9 are adjusted, and the frequency is reduced by 1Hz each time, and the first preset time is passed and the sampling is taken again; If the control unit determines that the first screened product is qualified and the second screened product is qualified, the excitation parameters of the two specific gravity screens and the parameters of the fan 9 are kept unchanged, and sampling is performed once after the second preset time for review.

[0034] See also Figure 5 The first image acquisition device 40 and the second image acquisition device 41 take photos and samples once a minute. The control unit calculates from the current frame of the first image that ≥99% of the target area is yellow and ≤1% is gray, and determines that the copper powder is qualified; the control unit calculates from the current frame of the second image that ≥75% of the target area is gray and ≤25% is yellow, and determines that the aluminum powder is unqualified.

[0035] Specifically, see Figure 3 A first specific gravity screen 30 and a second specific gravity screen 31 are arranged below the box vibrating screen 2 , and the first specific gravity screen 30 is located in front of the second specific gravity screen 31 .

[0036] Since the second sieved material is aluminum powder, if the yellow color in the second sieved material accounts for a high proportion, it means that the second sieved material has more impurities, and copper powder may be mixed in the second sieved material. The control unit needs to adjust the excitation parameters of the two specific gravity screens or increase the parameters of the fan to vibrate and screen out the copper powder in the second specific gravity screen 31, or blow the copper powder in the material of the box vibrating screen 2 to the edge of the screen structure of the box vibrating screen 2, and drop it from the edge of the screen structure into the first specific gravity screen 30.

[0037] Therefore, when it is judged that the copper powder is qualified and the aluminum powder is unqualified, the control unit adjusts the excitation parameters of the two specific gravity screens between 28Hz and 32Hz, adjusts the parameters of the fan 9, and performs frequency up-conversion processing, adjusting 1Hz each time. Until the control unit calculates that ≥99% of the target area is yellow and ≤1% is gray from the current frame of the first image, it is judged that the copper powder is qualified; and the control unit calculates that ≥98% of the target area is gray and ≤2% is yellow from the current frame of the second image, and the aluminum powder is qualified, the control unit judges that the copper powder is qualified and the aluminum powder is qualified, the excitation parameters of the two specific gravity screens and the parameters of the fan 9 can be adjusted unchanged, and sampling is performed every 5 minutes for verification.

[0038] In one embodiment, when the control unit determines that the copper powder is qualified and the aluminum powder is unqualified, the excitation parameters of the two specific gravity screens can be adjusted to 32Hz, and then the parameters of the fan 9 can be gradually increased to 26Hz to vibrate and screen out the copper powder in the second specific gravity screen 31, or blow the copper powder in the material to the edge of the screen structure and drop it from the edge of the screen structure into the first specific gravity screen 30.

[0039] See also Figure 6 The first image acquisition device 40 and the second image acquisition device 41 take photos and samples once a minute. The control unit calculates from the current frame of the first image that ≥92% of the target area is yellow and ≤8% is gray, and determines that the copper powder is unqualified; the control unit calculates from the current frame of the second image that ≥98% of the target area is gray and ≤2% is yellow, and determines that the aluminum powder is qualified.

[0040] Specifically, the first sieved material is copper powder. If the gray color of the first sieved material accounts for a high proportion, it means that the first sieved material has more impurities, and there may be aluminum powder mixed in the first sieved material. The control unit needs to adjust the excitation parameters of the two specific gravity screens and reduce the parameters of the fan 9 to oscillate the aluminum powder in the material to the second specific gravity screen 31, or reduce the situation where the fan blows too much and blows the aluminum powder in the material to the edge of the screen structure in the box vibrating screen 2, and falls from the edge of the screen structure into the first specific gravity screen 30.

[0041] Therefore, when it is judged that the copper powder is unqualified and the aluminum powder is qualified, the excitation parameters of the two specific gravity screens are adjusted between 28Hz and 32Hz, and the parameters of the fan 9 are adjusted to reduce the frequency by 1Hz each time. After one minute of adjustment, take photos and take samples again. Until the control unit calculates that ≥99% of the target area in the current frame of the first image is yellow and ≤1% is gray, it is judged that the copper powder is qualified; and the control unit calculates that ≥98% of the target area in the current frame of the second image is gray and ≤2% is yellow, it is judged that the aluminum powder is qualified.

[0042] Specifically, in one embodiment, when the control unit determines that the copper powder is qualified and the aluminum powder is unqualified, the excitation parameters of the two specific gravity screens can be adjusted to 28Hz, and then the parameters of the fan 9 can be gradually reduced to 18Hz to oscillate the aluminum powder in the material to the second specific gravity screen 31, and reduce the situation where the fan blows too much air and blows the aluminum powder in the material to the edge of the screen structure in the box vibrating screen 2, and falls from the edge of the screen structure into the first specific gravity screen 30.

[0043] In one embodiment, the waste lithium battery copper and aluminum sorting device 100 further includes a transfer silo 1 and a box vibrating screen 2, wherein the transfer silo 1 is connected to the box vibrating screen 2; before the first image acquisition device 40 acquires a first image at the screen surface of the first specific gravity screen 30, and the second image acquisition device 41 acquires a second image at the screen surface of the second specific gravity screen 31, the steps include: Put the material into the transfer silo 1, and the material enters the box vibrating screen 2 from the transfer silo 1; The box vibrating screen 2 vibrates, and the box vibrating screen 2 is provided with a screen structure to perform particle size sorting, the screened material enters the first specific gravity screen 30 and is screened out into a first screened material, and the screened material enters the second specific gravity screen 31 and is screened out into a second screened material.

[0044] The screen structure may be a 100-mesh screen. The screen structure may be further equipped with a 20-mesh screen to simultaneously process materials with three particle sizes of greater than 0.85 mm, 0.15-0.85 mm, and less than 0.15 mm, thereby improving the recovery efficiency.

[0045] In one embodiment, the step of putting the material into the transfer silo 1 and the material entering the box vibrating screen 2 from the transfer silo 1 includes: The transfer silo 1 is provided with a material level device. When the material storage volume of the transfer silo 1 reaches the starting material level of the material level device, the gate of the transfer silo 1 opens, and the material enters the box vibrating screen 2. When the material volume of the silo is lower than the minimum material level of the transfer silo 1, the equipment is stopped to save energy. The feeding speed can be adjusted according to the opening of the gate in the transfer silo 1.

[0046] In one embodiment, the waste lithium battery copper and aluminum sorting device 100 further includes a diverter 5, a tubular vibrating conveyor 6, a discharge bin, a screw conveyor 7, a collecting mechanism and an air flow conveying device 8, wherein the inlet end of the tubular vibrating conveyor 6 is connected to the diverter 5, the outlet end is connected to the discharge bin and the screw conveyor 7, the outlet of the screw conveyor 7 is connected to the collecting mechanism, and the air flow conveying device 8 is connected to the transfer bin 1; If the control unit determines that either the first screened product or the second screened product is unqualified, after the step of controlling the excitation parameters of the first specific gravity screen 30 and the second specific gravity screen 31 and the parameters of the fan 9, the method further comprises: The switching mechanism is started, and the material enters the tubular vibrating conveyor 6 from the diversion device 5; The tubular vibrating conveyor 6 conveys the qualified first screened material and the qualified second screened material to the discharge bin, and the screw conveyor 7 conveys the qualified first screened material and the qualified second screened material to the collecting mechanism for collection; The air flow conveying device 8 pumps the unqualified first screened material and the unqualified second screened material back to the transfer silo 1 through the pipeline for circulation screening.

[0047] See also Figure 1 and Figure 2 The copper and aluminum separation method of waste lithium batteries of the present invention is as follows: The material is put into the transfer silo 1 , and the material enters the box vibrating screen 2 from the transfer silo 1 .

[0048] The box vibrating screen 2 vibrates, and the box vibrating screen 2 is provided with a screen structure to perform particle size sorting. The material on the screen enters the first specific gravity screen 30 and is screened out as the first screened material, and the material under the screen enters the second specific gravity screen 31 and is screened out as the second screened material to perform specific gravity sorting.

[0049] At least two CCD cameras collect and detect a first image at the screen surface of the first specific gravity screen 30 and a second image at the screen surface of the second specific gravity screen 31 respectively.

[0050] The control unit calculates the yellow distribution percentage and the gray percentage of the target area in the first image, and compares the yellow distribution percentage with the first preset percentage. If the yellow distribution percentage is greater than or equal to 98.2%, the first screened material in the first specific gravity screen 30 is judged to be qualified; and the control unit calculates the gray distribution percentage and the yellow percentage of the target area in the second image, and compares the gray distribution percentage with the second preset percentage. If the gray distribution percentage is greater than or equal to 96.5%, the second screened material in the second specific gravity screen 31 is judged to be qualified.

[0051] If the control unit determines that the first sieve is qualified and the second sieve is unqualified, the excitation parameters of the two specific gravity screens are maintained between 28Hz and 32Hz, the parameters of the fan 9 are adjusted, and the frequency is increased by 1Hz each time, and the first preset time is passed and the sampling is taken again; If the control unit determines that the first sieve out is unqualified and the second sieve out is qualified, the excitation parameters of the two specific gravity screens are maintained between 28Hz and 32Hz, the parameters of the fan 9 are adjusted, and the frequency is reduced by 1Hz each time, and the first preset time is passed and the sampling is taken again; If the control unit determines that the first screened product is qualified and the second screened product is qualified, the excitation parameters of the two specific gravity screens and the parameters of the fan 9 are kept unchanged, and sampling is performed once after the second preset time for review.

[0052] After at least two CCD cameras respectively collect and detect the first image at the screen surface of the first specific gravity screen 30 and the second image at the screen surface of the second specific gravity screen 31, the switching mechanism is started, and the material enters the tubular vibrating conveyor 6 from the diversion device 5; the tubular vibrating conveyor 6 conveys the qualified first screened material and the qualified second screened material to the discharge silo, and the screw conveyor 7 conveys the qualified first screened material and the qualified second screened material to the collecting mechanism for collection; the airflow conveying device 8 pumps the unqualified first screened material and the unqualified second screened material back to the transfer silo 1 through the pipeline for cyclic screening.

[0053] The present invention also proposes a waste lithium battery copper and aluminum sorting device 100, comprising a first specific gravity screen 30, a second specific gravity screen 31, a fan 9 and a control unit, wherein the fan 9 is arranged on the first specific gravity screen 30 and the second specific gravity screen 31, a first image acquisition device 40 is installed at the outlet of the first specific gravity screen 30, and a second image acquisition device 41 is installed at the outlet of the second specific gravity screen 31.

[0054] In one embodiment, the waste lithium battery copper and aluminum sorting device 100 also includes a transfer silo 1 and a box vibrating screen 2, and the transfer silo 1 is connected to the box vibrating screen 2; the waste lithium battery copper and aluminum sorting device 100 also includes a diverter 5, a tubular vibrating conveyor 6, a discharge silo, a screw conveyor 7, a collecting mechanism and an airflow conveying device 8, the inlet end of the tubular vibrating conveyor 6 is connected to the diverter 5, and the outlet end is connected to the discharge silo and the screw conveyor 7, the outlet of the screw conveyor 7 is connected to the collecting mechanism, and the airflow conveying device 8 is connected to the transfer silo 1.

[0055] Among them, the air flow conveying device 8 pumps the unqualified first screened material and the unqualified second screened material back to the transfer silo 1 through the pipeline for circulation screening, so as to further screen out the first screened material and the second screened material, improve the screening effect, and further recover the copper powder and aluminum powder.

[0056] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A method for separating copper and aluminum from waste lithium batteries, characterized in that: Applicable to a waste lithium battery copper and aluminum sorting device, the waste lithium battery copper and aluminum sorting device comprises a first specific gravity screen, a second specific gravity screen, a fan and a control unit, the fan is arranged at the first specific gravity screen and the second specific gravity screen, a first image acquisition device is installed at the outlet of the first specific gravity screen, and a second image acquisition device is installed at the outlet of the second specific gravity screen; The method for separating copper and aluminum from waste lithium batteries comprises the following steps: The first image acquisition device acquires a first image at a screen surface of a first specific gravity screen, and the second image acquisition device acquires a second image at a screen surface of a second specific gravity screen; The control unit acquires a first image and a second image, and the control unit determines whether a first screened object in a first specific gravity screen is qualified according to a color distribution of the first image; and determines whether a second screened object in a second specific gravity screen is qualified according to a color distribution of the second image; If the control unit determines that either the first screened product or the second screened product is unqualified, the control unit controls the excitation parameters of the first specific gravity screen and the second specific gravity screen and controls the parameters of the fan.

2. The method for separating copper and aluminum from waste lithium batteries according to claim 1, characterized in that: The control unit determines whether the first screened product in the first specific gravity screen is qualified according to the color distribution of the first image; and determines whether the second screened product in the second specific gravity screen is qualified according to the color distribution of the second image, including: The control unit calculates the first color distribution percentage and the second color percentage of the target area in the first image, compares the first color distribution percentage with the first preset percentage, and determines whether the first screened product in the first specific gravity screen is qualified; The control unit calculates the third color distribution percentage and the fourth color percentage of the target area in the second image, compares the fourth color distribution percentage with the second preset percentage, and determines whether the second screened product in the second specific gravity screen is qualified.

3. The method for separating copper and aluminum from waste lithium batteries as claimed in claim 2, characterized in that: The first preset percentage is 98.5%; the control unit calculates the first color distribution percentage and the second color percentage of the target area in the first image, compares the first color distribution percentage with the first preset percentage, and determines whether the first screened product in the first specific gravity screen is qualified, including: The first color of the first image is yellow, and the second color is gray; The control unit calculates the yellow distribution percentage and the gray percentage of the target area in the first image, compares the yellow distribution percentage with the first preset percentage, and if the yellow distribution percentage is greater than or equal to 98.2%, determines that the first screened product in the first specific gravity screen is qualified.

4. The method for separating copper and aluminum from waste lithium batteries as claimed in claim 2, characterized in that: The second preset percentage is 96.5%; the control unit calculates the third color distribution percentage and the fourth color percentage of the target area in the second image, compares the fourth color distribution percentage with the second preset percentage, and determines whether the second screened product in the second specific gravity screen is qualified, including: The third color of the second image is yellow, and the fourth color is gray; The control unit calculates the gray distribution percentage and the yellow percentage of the target area in the second image, compares the gray distribution percentage with the second preset percentage, and if the gray distribution percentage is greater than or equal to 96.5%, the second screened product in the second specific gravity screen is judged to be qualified.

5. The method for separating copper and aluminum from waste lithium batteries according to claim 1, characterized in that: If the control unit determines that either the first screened product or the second screened product is unqualified, the control unit controls the excitation parameters of the first specific gravity screen and the second specific gravity screen and controls the parameters of the fan, including: If the control unit determines that the first sieve out is qualified and the second sieve out is unqualified, the excitation parameters of the two specific gravity screens are maintained between 28Hz and 32Hz, the parameters of the fan are adjusted, and the frequency is increased by 1Hz each time, and the photo sampling is performed again after the first preset time; If the control unit determines that the first sieve out is unqualified and the second sieve out is qualified, the excitation parameters of the two specific gravity screens are maintained between 28Hz and 32Hz, the parameters of the fan are adjusted, the frequency is reduced by 1Hz each time, and the photo sampling is performed again after the first preset time; If the control unit determines that the first screened product is qualified and the second screened product is qualified, the excitation parameters of the two specific gravity screens and the parameters of the fan are kept unchanged, and sampling is performed once after a second preset time for review.

6. The method for separating copper and aluminum from waste lithium batteries according to claim 1, characterized in that: The waste lithium battery copper and aluminum sorting device also includes a transfer silo and a box vibrating screen, and the transfer silo is connected to the box vibrating screen; before the first image acquisition device acquires a first image at the screen surface of the first specific gravity screen, and the second image acquisition device acquires a second image at the screen surface of the second specific gravity screen, the method includes: Put the material into the transfer silo, and the material enters the box vibrating screen from the transfer silo; The box vibrating screen vibrates, and the box vibrating screen is provided with a screen structure to perform particle size sorting, the screened material enters the first specific gravity screen and screens out the first screened material, and the screened material enters the second specific gravity screen and screens out the second screened material.

7. The method for separating copper and aluminum from waste lithium batteries as claimed in claim 6, characterized in that: The step of putting the material into the transfer silo and the material entering the box vibrating screen from the transfer silo includes: The transfer silo is provided with a material level device. When the material storage volume of the transfer silo reaches the starting material level of the material level device, the gate of the transfer silo opens and the material enters the box vibrating screen.

8. The method for separating copper and aluminum from waste lithium batteries according to claim 1, characterized in that: The waste lithium battery copper and aluminum sorting device also includes a shunt device, a tubular vibrating conveyor, a discharge bin, a screw conveyor, a collecting mechanism and an air flow conveying device, wherein the inlet end of the tubular vibrating conveyor is connected to the shunt device, the outlet end is connected to the discharge bin and the screw conveyor, the outlet of the screw conveyor is connected to the collecting mechanism, and the air flow conveying device is connected to the transfer bin; If the control unit determines that either the first screened product or the second screened product is unqualified, the control unit controls the excitation parameters of the first specific gravity screen and the second specific gravity screen and controls the parameters of the fan, including: The switching mechanism is started, and the material enters the tubular vibrating conveyor from the diversion device; The tubular vibrating conveyor conveys the qualified first screened material and the qualified second screened material to the discharge bin, and the screw conveyor conveys the qualified first screened material and the qualified second screened material to the collecting mechanism for collection; The air flow conveying device pumps the unqualified first screened material and the unqualified second screened material back to the transfer silo through the pipeline for cyclic screening.

9. A waste lithium battery copper and aluminum separation device, using the waste lithium battery copper and aluminum separation method according to any one of claims 1 to 8, characterized in that: The waste lithium battery copper and aluminum sorting device includes a first specific gravity screen, a second specific gravity screen, a fan and a control unit. The fan is arranged on the first specific gravity screen and the second specific gravity screen. A first image acquisition device is installed at the outlet of the first specific gravity screen, and a second image acquisition device is installed at the outlet of the second specific gravity screen.

10. The waste lithium battery copper and aluminum separation device according to claim 9, characterized in that: It also includes a transfer silo and a box vibrating screen, wherein the transfer silo is connected to the box vibrating screen; The waste lithium battery copper and aluminum sorting device also includes a diverter device, a tubular vibrating conveyor, a discharge silo, a screw conveyor, a collecting mechanism and an air flow conveying device. The inlet end of the tubular vibrating conveyor is connected to the diverter device, and the outlet end is connected to the discharge silo and the screw conveyor. The outlet of the screw conveyor is connected to the collecting mechanism, and the air flow conveying device is connected to the transfer silo.

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