Multi-stage screening and recycling treatment device for waste lithium battery crushed materials

Abstract

The invention relates to the technical field of lithium battery recovery treatment, in particular to a multistage screening recovery treatment device for waste lithium battery crushed materials. Comprising a treatment tank, a feeding hopper is arranged at the top of the treatment tank, a spiral pipe communicated with the feeding hopper is arranged in the treatment tank, a plurality of first screens are arranged at the bottom in the spiral pipe, the hole diameters of the first screens in the spiral direction of the spiral pipe are gradually increased, and a discharging opening is formed in the position, at the tail end of the spiral pipe, of the treatment tank; and a winnowing device communicated with the first screens is arranged at the bottom of the spiral pipe, and the winnowing device guides transverse wind to blow to the crushed aggregates falling from the first screens, so that the small crushed aggregates in the large particles are separated. Air flow in the air supply assembly is introduced by means of the air conveying pipe and blown to crushed aggregates in the spiral pipe, small particles are promoted to be separated from large particles, meanwhile, the air conveying pipe located in the discharging pipe blocks the crushed aggregates so as to convey the air flow in the air supply pipe to the leeward side, and therefore the small particles on the leeward side are attracted, and the screening effect on the crushed aggregates is improved.

Description

Technical Field

[0001] This invention relates to the field of lithium battery recycling technology, and more specifically, to a multi-stage screening and recycling device for waste lithium battery crushed materials. Background Technology

[0002] Currently, waste lithium batteries can be effectively recycled through wet integrated recycling systems to recover alloys from waste batteries. Metals such as copper, zinc, manganese, and iron stored in waste batteries can also be recovered, enabling them to be effectively recycled and reused while protecting the environment.

[0003] After the waste batteries are crushed and recycled, the coarsely crushed powder needs to be transported to an electrically heated pyrolysis furnace for pyrolysis. The pyrolyzed powder is then transported to a fine crusher for fine crushing, and finally screened.

[0004] In the spiral screening process for lithium battery fragments, large particles rolling inside the spiral tube easily trap smaller particles. When large particles are on the windward side and small particles are on the leeward side, the large particles, by their own size, shield the small particles. This alters the airflow distribution acting on the fragments, weakening the direct impact force of the airflow on the small particles on the leeward side. The small particles struggle to gain sufficient kinetic energy to separate from the large particles, causing some to fall with them, thus affecting screening accuracy and reducing screening efficiency. Summary of the Invention

[0005] This invention provides a multi-stage screening and recycling device for waste lithium battery crushed materials. By means of an air supply pipe, airflow from the air supply component is introduced and blown onto the crushed material in the spiral tube. At the same time, the air supply pipe blocks the crushed material, thereby solving the problem mentioned in the background art, namely: the direct impact force of the airflow on the small particles on the leeward side is weakened, and the small particles are difficult to obtain sufficient kinetic energy to separate from the large particles.

[0006] To achieve the above objectives, a multi-stage screening and recycling device for waste lithium battery crushed material includes a processing tank. The top of the processing tank is equipped with a feeding hopper, and the inside is equipped with a spiral tube connected to the feeding hopper. Several first screens are arranged at the bottom of the spiral tube, and the aperture of each first screen gradually increases along the spiral direction of the spiral tube. A discharge port is opened on the processing tank at the end of the spiral tube. An air separation device connected to the several first screens is arranged at the bottom of the spiral tube. The air separation device guides crosswinds to blow towards the crushed material falling from the first screens, so that small particles of crushed material wrapped in large particles can be separated. Furthermore, the air separation device is also equipped with an air supply component connected to it. The other end of the air supply component is connected to the spiral tube located at the first screen. The air supply component can blow small particles from the outer side of the spiral tube to the inner side and divert the particles falling from the first screen to guide the crosswind of the air separation device to the leeward side, thereby attracting small particles on the leeward side.

[0007] The air separation device includes a shell disposed inside the processing tank, fan blades located inside the shell and rotatably disposed therewith, and each feed pipe connected to the shell, wherein an air supply pipe is connected between the feed pipes; The top of the feed pipe is located below the first screen. A discharge pipe is provided on the opposite side of the air supply pipe. One end of the discharge pipe is connected to the feed pipe, and the other end penetrates the side wall of the processing tank. The lower edge of the discharge pipe is lower than the lower edge of the air supply pipe. The bottom of the discharge pipe penetrates the processing tank to introduce large particles of material to the outside.

[0008] The air supply assembly includes an air distribution pipe located above and connected to the housing, and several air delivery pipes connected to the air distribution pipe in the longitudinal direction. The other end of the air distribution pipe is closed. The air delivery pipe passes through the feed pipe and is connected to an air delivery box. The air delivery box is connected to a spiral tube corresponding to the first screen, and the air delivery box points to the inner side of the inner wall of the spiral tube, so as to promote the small particles to move to the inner side of the inner wall of the spiral tube by crosswind.

[0009] The air supply pipe located inside the feed pipe is used to divide the falling debris into two streams, and the two streams of debris below the air supply pipe form a shielding area for the crosswind flow in the air supply pipe, so as to guide the crosswind to the leeward side.

[0010] A support plate is fixedly installed between the shell and the inner wall of the processing tank. A receiving box located at the end of the spiral tube is installed above the support plate. Several uprights that slide with the support plate are fixedly installed at the bottom of the receiving box. Compression springs that abut against the support plate and the receiving box are sleeved on the uprights.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. In this multi-stage screening and recycling device for waste lithium battery crushed material, the airflow in the air supply component is introduced into the spiral tube and blown towards the crushed material through the air supply pipe, causing small particles to separate from large particles. At the same time, the air supply pipe located in the feed pipe forms a blockage against the crushed material, so as to transport the airflow in the air supply pipe to the leeward side, thereby attracting small particles on the leeward side and improving the screening effect of the crushed material.

[0012] 2. In this multi-stage screening and recycling device for waste lithium battery crushed material, by moving the stop plate laterally to adjust the distance it extends into the gas distribution pipe, the airflow flowing into the gas supply pipe can be regulated, forcing the airflow velocity in the gas supply pipe to increase, thereby increasing the attraction of small particles on the leeward side, improving the attraction effect of small particles and the screening quality. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the air separation device of the present invention; Figure 3 This is a schematic diagram of airflow within the gas supply pipe and gas transmission pipe of the present invention. Figure 4 This is a schematic diagram of the air separation principle of the present invention; Figure 5 This is a schematic diagram illustrating the principle of the gas pipeline blocking debris according to the present invention; Figure 6 This is a schematic diagram of airflow within the gas supply pipe of the present invention; Figure 7 This is a cross-sectional schematic diagram of the internal structure of the processing tank of the present invention; Figure 8 This is a schematic diagram of a partial cross-sectional view of the spiral tube structure of the present invention; Figure 9 For the present invention Figure 3 A magnified structural diagram at point A in the diagram.

[0014] The meanings of the labels in the diagram are as follows: 100. Processing tank; 101. Feed hopper; 102. Spiral tube; 103. Discharge port; 104. First screen; 110. Air separator; 111. Shell; 112. Fan blade; 113. Feed pipe; 114. Air supply pipe; 115. Discharge pipe; 116. Support plate; 117. Discharge pipe; 120. Gas delivery pipe; 121. Gas distribution pipe; 122. Shielding area; 123. Gas delivery box; 130. Stop plate; 131. Slide rod; 132. Push block; 133. Material receiving box; 134. Second screen; 135. Baffle plate; 136. Return spring; 137. Stop block; 140. Compression spring. Detailed Implementation

[0015] The technical solutions of this invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0016] To address the problem of small particles being obstructed by large particles, this invention discloses a multi-stage screening and recycling device for waste lithium battery crushed materials. (Refer to...) Figure 1 , Figure 2 As shown, it includes a processing tank 100, a feed hopper 101 at the top of the processing tank 100, and a spiral tube 102 connected to the feed hopper 101 inside the tank. Figure 3As shown, several first screens 104 are provided at the bottom of the spiral tube 102. The aperture of each first screen 104 gradually increases along the spiral direction of the spiral tube 102. A discharge port 103 is provided on the processing tank 100 at the end of the spiral tube 102. When the raw material is screened, the raw material is fed into the feed hopper 101. Smaller fragments will fall through the first screen 104 with the smallest aperture at the top first, while other fragments continue to roll in the spiral tube 102 until they move to the first screen 104 with the corresponding aperture, and then fall through the corresponding first screen 104, thereby achieving the screening of the fragments.

[0017] In order to enable the raw material to roll quickly inside the spiral tube 102, a vibration generating device (not shown in the figure) can also be installed on the spiral tube 102. The vibration causes the raw material to move along the path inside the spiral tube 102, and finally, larger pieces are discharged from the discharge port 103.

[0018] The impurities in the fragments can be roughly divided into two categories: small particles (e.g., black powder, iron powder) and larger particles (e.g., fragments of lithium battery casings). For larger impurities (hereinafter referred to as large particles), the end of the spiral tube 102 is open. When large particles roll inside the spiral tube 102, they cannot fall through the first screen 104 due to their large size. Therefore, the large particles will be discharged through the opening at the end of the spiral tube 102. For some smaller particles, these fragments will fall through the first screen 104 with the corresponding aperture size.

[0019] For smaller impurities (hereinafter referred to as small particles), some small particles will fall from the top first screen 104 first, while others will roll along with the larger particles. To address this, an air separation device 110 connected to several first screens 104 is provided at the bottom of the spiral tube 102. The air separation device 110 guides crosswinds to blow towards the fragments falling from the first screens 104, thus separating the small particles encased in the larger particles. However, as the fragments roll down the inner diameter of the spiral tube 102, they are affected by centrifugal force and the tilt angle of the spiral tube 102, causing large particles to carry some small particles and adhere to the inner wall of the spiral tube 102, thus affecting the screening quality. Therefore, the air separation device 110 is also equipped with an air supply component connected to it. The other end of the air supply component is connected to the spiral tube 102 corresponding to the first screen 104, and the air supply component can blow small fragments from the outer side of the inner wall of the spiral tube 102 towards the inner side (in...). Figure 3The diagram shows the outer side and inner side of the inner wall of the spiral tube 102 (the outer side of the inner wall is the area indicated by arrow h, and the inner side of the inner wall is the area indicated by arrow f). It diverts the debris falling from the first screen 104 to guide the crosswind of the air separator 110 to the leeward side, thereby attracting small particles of debris on the leeward side.

[0020] First, the air separation device 110 includes a housing 111 disposed inside the processing tank 100, a fan blade 112 located inside the housing 111 and rotatably disposed therewith, and a feed pipe 113 connected to the housing 111. An air supply pipe 114 is connected between the feed pipes 113. In this way, when the crushed material falls from the first screen 104, the crushed material is conveyed downward along the feed pipe 113 until it falls to the connection between the air supply pipe 114 and the feed pipe 113. Since the falling crushed material contains particles of different sizes and weights, for the small particles, the crosswind blown from the air supply pipe 114 blows them to one side.

[0021] At this time, the top of the feed pipe 113 is located below the first screen 104. A discharge pipe 115 is installed on the opposite side of the air supply pipe 114. One end of the discharge pipe 115 is connected to the feed pipe 113, and the other end penetrates the side wall of the processing tank 100. The lower edge of the discharge pipe 115 is lower than the lower edge of the air supply pipe 114 (see reference). Figure 4 As shown, the vertical distance between the lower edge of the discharge pipe 115 and the lower edge of the air supply pipe 114 is d). The shell 111 is connected to the outside through the air hole at the bottom of the processing tank 100. The airflow generated by the rotation of the fan blade 112 is transported into the discharge pipe 113 through the air supply pipe 114 to perform air separation on the falling fragments, thereby blowing small particles into the discharge pipe 115 for discharge. For large particles, the large particles continue to fall from the discharge pipe 113. Then, the bottom of the discharge pipe 113 penetrates the processing tank 100 to introduce the large fragments to the outside.

[0022] Secondly, based on Figure 3 Based on and combined Figure 4 As shown, in order to separate small particles entrained by large particles, the small particles close to the outer side of the inner wall of the spiral tube 102 are blown by the air supply component to cause the small particles to move towards the inner side of the inner wall of the spiral tube 102, thereby passing through the first screen 104 and falling into the feed pipe 113. For this purpose, the structure of the air supply component is disclosed. The air supply component includes an air distribution pipe 121 located above and connected to the housing 111, and several air delivery pipes 120 connected to the air distribution pipe 121 in the longitudinal direction. The other end of the air distribution pipe 121 is closed. The air delivery pipes 120 pass through the feed pipe 113 and are connected to an air delivery box 123. The air delivery box 123 is connected to the spiral tube 102 corresponding to the first screen 104, and the air delivery box 123 points towards the inner side of the inner wall of the spiral tube 102, so as to cause the small particles to move towards the inner side of the inner wall of the spiral tube 102 by crosswind. That is, the airflow generated by the fan blade 112 can not only be transported into the feed pipe 113 through the air supply pipe 114, but also be transported into the air distribution pipe 121 through the housing 111. Then, the airflow is guided into the air delivery box 123 through the air delivery pipe 120 and finally discharged from the air delivery box 123. The discharged airflow blows towards the broken material close to the outer side of the inner wall of the spiral tube 102. The airflow blows the lighter small particles towards the inner side of the inner wall of the spiral tube 102, so that the small particles are separated from the large particles and fall into the feed pipe 113 through the first screen 104 for secondary air separation, thereby improving the screening effect.

[0023] Further reference Figure 4 , Figure 5 , Figure 6 As shown, the process of the falling debris in the feed pipe 113 being separated is illustrated. The air supply pipe 120 located in the feed pipe 113 is used to divide the falling debris into two streams, and the two streams of debris below the air supply pipe 120 form a shielding area 122 through which the crosswind in the air supply pipe 114 flows, so as to guide the crosswind to the leeward side. Working principle: As the broken material falls downwards in the feed pipe 113, the air supply pipe 120 passes through the feed pipe 113. Thus, the air supply pipe 120 within the feed pipe 113 obstructs the falling broken material, causing it to be divided into two parts located on either side of the air supply pipe 120. Figure 5 The shown fragment falling state is such that when the two parts of fragment fall to the connection between the air supply pipe 114 and the discharge pipe 113, the airflow in the air supply pipe 114 blows towards the fragment, blowing the lighter and smaller particles in the fragment into the discharge pipe 115, while the heavier and larger particles are discharged from the bottom of the discharge pipe 113.

[0024] Meanwhile, no debris flows through the shielding area 122 located below the gas pipe 120, thus not obstructing the airflow. Therefore, some airflow flows from the shielding area 122 to the leeward side. At this time, reference... Figure 6 As shown, Figure 6 The diagram shows the airflow flowing from the shielded area 122 to the leeward side. The airflow creates negative pressure on the leeward side, which can attract small particles located on the leeward side, thereby improving the screening effect of small particles.

[0025] In other words, the airflow in the air supply component is introduced into the spiral tube 102 by means of the air supply pipe 120 and blown towards the crushed material, causing small particles to separate from large particles. At the same time, the air supply pipe 120 located in the feed pipe 113 forms a blockage for the crushed material, so as to transport the airflow in the air supply pipe 114 to the leeward side, thereby attracting small particles on the leeward side and improving the screening effect of the crushed material.

[0026] Next, combined Figure 7 , Figure 8As shown, during the process of crushed material rolling down inside the spiral tube 102, some small particles of crushed material are not completely screened and will be discharged from the spiral tube 102 along with the large particles. For this purpose, a support plate 116 is fixedly installed between the shell 111 and the inner wall of the processing tank 100. A receiving box 133 located at the end of the spiral tube 102 is installed above the support plate 116. Several uprights that slide with the support plate 116 are fixedly installed at the bottom of the receiving box 133. Compression springs 140 that abut against the support plate 116 and the receiving box 133 are sleeved on the uprights. Under normal conditions, the compression springs 140 provide support for the receiving box 133 above. When large particles of crushed material come out of the spiral tube 102, the large particles of crushed material fall into the receiving box 133 for collection. Furthermore, because a second screen 134 is provided at the bottom of the receiving box 133, and the second screen 134 corresponds to the opening at the end of the spiral tube 102 with the opening facing the second screen 134, and the support plate 116 corresponding to the bottom of the second screen 134 has a notch, and a discharge pipe 117 fixed to the support plate 116 is provided below the notch, with the bottom of the discharge pipe 117 penetrating the bottom of the processing tank 100; therefore, small particles falling into the receiving box 133 pass through the second screen 134 and enter the discharge pipe 117 for discharge, while large particles are... The large particles are intercepted on the second screen 134. As the weight of the large particles falling into the receiving box 133 increases, the elastic potential energy of the compression spring 140 is overcome by gravity, causing the height of the receiving box 133 to drop. When the large particles in the receiving box 133 reach the preset weight, the large particles in the receiving box 133 are manually cleaned and discharged. That is, the outer edge of the receiving box 133 is detachably connected to a baffle plate 135, which corresponds to the discharge port 103. The baffle plate 135 is removed and the large particles in the receiving box 133 are cleaned.

[0027] In addition, combined Figure 7 , Figure 9 As shown, to improve the air separation effect of small particles in the feed pipe 113, a baffle 130 is movably installed in the air distribution pipe 121 to intercept the airflow in the air distribution pipe 121. The baffle 130 is horizontally lower than the connection point between the bottom air supply pipe 120 and the air distribution pipe 121. In this way, by moving the baffle 130 laterally to adjust its extension distance into the air distribution pipe 121, the airflow flowing into the air supply pipe 120 can be regulated, forcing an increase in the airflow velocity delivered to the air supply pipe 114. Conversely, Figure 5 Increased airflow velocity can increase the attraction of small particles on the leeward side, thereby improving the attraction effect and screening quality of small particles.

[0028] Specifically, when adjusting the lateral distance of the stop plate 130, a slide rod 131 is fixedly installed at the end of the stop plate 130. A bracket fixed to the bearing plate 116 is slidably installed on the slide rod 131, and a push block 132 that fits against the inner side of the receiving box 133 is fixedly installed at the end of the slide rod 131. On the other hand, a return spring 136 is sleeved on the slide rod 131. One end of the return spring 136 abuts against one of the brackets, and the other end abuts against the stop block 137 fixed on the slide rod 131. In this way, when the weight of the receiving box 133 increases, the receiving box 133 moves downward to overcome the elastic potential of the compression spring 140 and the return spring 136. Yes, the receiving box 133 applies pressure to the push block 132, causing the push block 132 to transmit the lateral thrust to the stop plate 130 through the slide rod 131. During this process, the return spring 136 is compressed by the stop block 137, and the stop plate 130 extends into the air distribution pipe 121 to block the airflow flowing into the air distribution pipe 121, restricting the airflow to be delivered into the air supply pipe 120, and forcing the airflow velocity delivered into the air supply pipe 114 to increase. After the large particles in the receiving box 133 are cleaned, the receiving box 133 moves upward, and under the elastic action of the return spring 136, it pushes the stop block 137 to move in the opposite direction, causing the stop plate 130 to exit from the air distribution pipe 121.

[0029] Return to Figure 8 As shown, it should also be understood that, since the end opening of the spiral tube 102 faces downwards, and the bottom of the receiving box 133 is supported by the compression spring 140, the airflow delivered to the spiral tube 102 via the air supply pipe 120 is discharged from the opening. When the second screen 134 is covered with large particles, these large particles will block the small particles from re-entering the receiving box 133. At this time, the airflow discharged from the opening blows towards the large particles, and the gravity of the large particles falling onto the second screen 134 further contributes to the effect. This applies a certain downward pressure to the receiving box 133, thereby forcing the receiving box 133 to move up and down frequently. The up and down movement of the receiving box 133 and its impact with the push block 132 cause small particles in the second screen 134 to be screened out through vibration. Furthermore, the frequent up and down movement of the receiving box 133 and its impact with the push block 132 cause the air conveying pipe 120 to frequently extend into the air distribution pipe 121, thereby continuously changing the airflow state in the air conveying pipe 120 and the air supply pipe 114, and improving the air separation quality.

[0030] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multi-stage screening and recycling device for waste lithium battery crushed material, comprising a processing tank (100), wherein a feed hopper (101) is provided at the top of the processing tank (100), and a spiral tube (102) connected to the feed hopper (101) is provided inside the processing tank (100). A plurality of first screens (104) are provided at the bottom of the spiral tube (102), the aperture of each first screen (104) gradually increases along the spiral direction of the spiral tube (102), and a discharge port (103) is provided on the processing tank (100) at the end of the spiral tube (102), characterized in that: At the bottom of the spiral tube (102), there is an air separation device (110) connected to several first screens (104). The air separation device (110) guides the crosswind to blow towards the fragments falling from the first screens (104), so that the small fragments wrapped in the large particles can be separated. Furthermore, the air separation device (110) is also equipped with an air supply component connected to it. The other end of the air supply component is connected to the spiral tube (102) located at the first screen (104). The air supply component can blow small particles from the outer side of the inner wall of the spiral tube (102) to the inner side, and divert the particles falling from the first screen (104) to guide the crosswind of the air separation device (110) to the leeward side, thereby attracting small particles on the leeward side.

2. The multi-stage screening and recycling device for waste lithium battery crushed material according to claim 1, characterized in that: The air separation device (110) includes a housing (111) disposed inside the processing tank (100), a fan blade (112) located inside the housing (111) and rotatably disposed therewith, and a feeding pipe (113) connected to the housing (111), wherein an air supply pipe (114) is connected between the feeding pipes (113). The top of the feed pipe (113) is located below the first screen (104). The feed pipe (113) is located on the opposite side of the air supply pipe (114) and a discharge pipe (115) is provided. One end of the discharge pipe (115) is connected to the feed pipe (113), and the other end penetrates the side wall of the processing tank (100). The lower edge of the discharge pipe (115) is lower than the lower edge of the air supply pipe (114). The bottom of the feed pipe (113) penetrates the processing tank (100) to introduce large particles of broken material to the outside.

3. The multi-stage screening and recycling device for waste lithium battery crushed material according to claim 2, characterized in that: The gas supply assembly includes a gas distribution pipe (121) located above and connected to the housing (111), and a plurality of gas delivery pipes (120) connected to the gas distribution pipe (121) in the longitudinal direction. The other end of the gas distribution pipe (121) is closed. The gas delivery pipe (120) passes through the feed pipe (113) and is connected to a gas delivery box (123). The gas delivery box (123) is connected to a spiral tube (102) corresponding to the first screen (104), and the gas delivery box (123) points to the inner side of the inner wall of the spiral tube (102) so that the small particles are moved to the inner side of the inner wall of the spiral tube (102) by crosswind.

4. The multi-stage screening and recycling device for waste lithium battery crushed material according to claim 3, characterized in that: The air supply pipe (120) located in the feed pipe (113) is used to divide the falling debris into two streams, and the two streams of debris below the air supply pipe (120) form a shielding area (122) through which the crosswind flows in the air supply pipe (114) so ​​as to guide the crosswind to the leeward side.

5. The multi-stage screening and recycling device for waste lithium battery crushed material according to claim 2, characterized in that: A support plate (116) is fixedly installed between the shell (111) and the inner wall of the processing tank (100). A receiving box (133) located at the end of the spiral tube (102) is installed above the support plate (116). Several uprights that slide with the support plate (116) are fixedly installed at the bottom of the receiving box (133). A compression spring (140) that abuts against the support plate (116) and the receiving box (133) is sleeved on the uprights.

6. The multi-stage screening and recycling device for waste lithium battery crushed material according to claim 5, characterized in that: The receiving box (133) is provided with a second screen (134) at the bottom. The second screen (134) corresponds to the opening at the end of the spiral tube (102). The opening faces the second screen (134). The support plate (116) corresponding to the bottom of the second screen (134) has a notch. Below the notch is a discharge pipe (117) fixed to the support plate (116). The bottom of the discharge pipe (117) penetrates the bottom of the processing tank (100).

7. The multi-stage screening and recycling device for waste lithium battery crushed material according to claim 5, characterized in that: The outer edge of the receiving box (133) is detachably connected to a baffle plate (135), which corresponds to the discharge port (103).

8. The multi-stage screening and recycling device for waste lithium battery crushed material according to claim 5, characterized in that: A baffle (130) is movably installed inside the gas distribution pipe (121) to intercept the airflow inside the gas distribution pipe (121). The baffle (130) is lower in the horizontal direction than the connection between the bottom gas supply pipe (120) and the gas distribution pipe (121).

9. The multi-stage screening and recycling device for waste lithium battery crushed material according to claim 8, characterized in that: The end of the stop plate (130) is fixedly provided with a slide rod (131), and a bracket fixed to the bearing plate (116) is slidably provided on the slide rod (131). The end of the slide rod (131) is fixedly provided with a push block (132) that fits against the inner side of the receiving box (133).

10. The multi-stage screening and recycling device for waste lithium battery crushed material according to claim 9, characterized in that: A return spring (136) is fitted on the slide rod (131). One end of the return spring (136) abuts against one of the brackets, and the other end abuts against the stop block (137) fixed on the slide rod (131).

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