Waste plastic product electroplated layer stripping equipment adopting multiple water circulation structures

Abstract

The invention discloses waste plastic product electroplated layer stripping equipment adopting multiple water circulation structures, relates to the technical field of waste plastic treatment, and adopts an acid pickling soaking mode as a basic principle for removing an electroplated layer, related operation actions are optimized based on the basic principle, a hanging basket can move up and down in an outer kettle body, and a water circulation structure is adopted. The device is mainly used for stirring waste plastic products contained in the device, and the difference is that the process of releasing an acid liquid medium mainly depends on the up-down moving process of the hanging basket, and the up-down moving process is used for improving the acid pickling and deplating efficiency and is specifically embodied in the two processes of releasing and recycling the acid liquid medium. The two processes of release / recovery of the cleaning water are further optimized by matching with the acid pickling process and the release / recovery process of the acid liquid medium, and the pH value of the acid liquid medium is synchronously monitored in real time for judging the effective capacity in the acid pickling process, so that the overall deplating efficiency is improved in this way.

Description

Technical Field

[0001] The present invention relates to the technical field of waste plastic treatment, and particularly relates to an electroplating layer stripping device for waste plastic products adopting a multi-water cycle structure. Background Art

[0002] The electroplating layer on the surface of waste plastic products affects the subsequent smelting process. Therefore, physical / chemical methods are used to remove the electroplating layer during the recycling process, including mechanical de-plating (grinding), chemical de-plating (acid-base corrosion, electrolytic stripping), ultrasonic de-plating, laser de-plating, plasma de-plating, etc. Among them, the chemical de-plating method with the lowest cost and simplest process is mainly used.

[0003] Whether it is acid-base corrosion or electrolytic stripping, a certain reaction time is required for the stripping process. Therefore, the soaking process is usually adopted, specifically by soaking the waste plastic products in the reagent. However, during the reaction / electrolysis process, it is difficult to ensure the specific state, specifically manifested as: if the dosage of the reagent is insufficient, it is difficult to completely remove the electroplating layer; but if the dosage of the reagent is increased, on the one hand, the consumption of the reagent will be increased, and it is more difficult to control the reaction state. In addition, a large amount of cleaning water is required to remove the residual reagent after stripping. Therefore, the present application proposes a solution. Summary of the Invention

[0004] The purpose of the present invention is to provide an electroplating layer stripping device for waste plastic products adopting a multi-water cycle structure, which is described for the process of electroplating layer stripping in the recycling operation of waste plastic products. During the overall operation process, it is difficult to master the dosage of the reagent and the reaction speed, and a large amount of cleaning water is consumed during the overall process.

[0005] The purpose of the present invention can be achieved by the following technical solutions: an electroplating layer stripping device for waste plastic products adopting a multi-water cycle structure, including an outer kettle body, a hanging basket, and a hoisting machine. The hanging basket is used to hold waste plastic products, and the hanging basket is placed inside the outer kettle body. The outer kettle body is provided with a lower tray and a liquid storage rubber balloon along the direction from top to bottom at the corresponding position below the hanging basket. A plurality of outer communication pipes are arranged at the external position of the outer kettle body. The hanging basket moves up and down inside the outer kettle body through the hoisting machine. The liquid storage rubber balloon is filled with an acid medium, and the acid medium inside the liquid storage rubber balloon is injected into the outer kettle body through the up and down movement of the hanging basket. A multi-interface component is arranged between the outer communication pipe and the outer kettle body. The multi-interface component includes a first-order liquid injection port, a clear liquid port, and a second-order liquid injection port.

[0006] Further set as: a water draining inclined part is installed at the upper end position of the outer kettle body, and the water draining inclined part is used as a temporary storage structure for the hanging basket.

[0007] It is further configured as follows: the lower tray is slidably connected to the inner wall of the outer kettle body along the vertical direction, the liquid storage rubber balloon is installed at the bottom end of the outer kettle body, and the liquid storage rubber balloon is connected to the lower end of the external exchange pipe.

[0008] It is further configured as follows: a piston block is provided in the external exchange pipe along the opening position of the first-order liquid injection port and the clear flow port, the first-order liquid injection port and the clear flow port are arranged in a direction from bottom to top, and the clear flow port is arranged at a position higher than the upper surface of the hanging basket.

[0009] It is further configured as follows: a clearing bin, a pressure empty bin and a liquid bin are respectively provided inside the external exchange pipe through two piston blocks along the direction from top to bottom, and the setting position between the second-order liquid injection port and the clearing bin matches.

[0010] It is further configured as follows: a multi-way circulation pipe is connected between the bottom end of the outer kettle body and the liquid tank, the multi-way circulation pipe includes a discharge pipe arranged vertically downward at the center point of the outer kettle body, and a pump body is arranged on the multi-way circulation pipe.

[0011] It is further configured as follows: a cooperative guide rod corresponding to the hanging basket and the liquid storage rubber balloon is installed at the center point of the lower tray, and the cooperative guide rod is arranged in the vertical direction.

[0012] It is further configured as follows: a clearance inclined groove is opened on the lower side surface of the hanging basket, the clearance inclined groove is arranged in a circular array along the center point of the hanging basket, and a top column corresponding to the clearance inclined groove is installed on the upper surface of the lower tray.

[0013] The present invention has the following beneficial effects: 1. The overall solution is based on pickling and immersion. Specifically, waste plastic products are immersed in an acid medium, and the reaction process between the acid medium and the electroplating layer is used to achieve a de-plating effect. Based on this, the relevant operation actions in the entire process are optimized. First, the hoist drives the hanging basket to move up and down. The purpose is to stir the waste plastic products inside it and increase the contact time / degree between the electroplating layer and the acid medium. In addition, the release process of the acid medium depends on the up and down movement of the hanging basket, and the up and down movement process is used to improve the pickling and de-plating efficiency. The two complement each other to improve the overall pickling efficiency. 2. Based on the above content, the pickling process and the release / recovery process of the acid solution medium further optimize the release / recovery of the cleaning water. Specifically, it is reflected in the flow modes of the cleaning water and the acid solution medium in the external communication pipeline. The cleaning action of the cleaning water is mainly based on the upward movement of the hanging basket. Specifically, it synchronously cleans the waste plastic products after pickling. The overall process synchronously and real-time monitors the pH value of the acid solution medium to judge the effective ability during the pickling process, completes it with a small dose of acid solution medium that meets the pickling requirements, maintains the normal progress of the corrosion reaction, and can also reduce the usage amount of the acid solution medium or the cleaning water during the overall pickling process. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0015] Figure 1 Schematic structural diagram of a waste plastic product electroplating layer stripping device adopting a multi-item water circulation structure proposed by the present invention; Figure 2 Cross-sectional view of the outer kettle body in a waste plastic product electroplating layer stripping device adopting a multi-item water circulation structure proposed by the present invention; Figure 3 Cross-sectional view of the hanging basket in a waste plastic product electroplating layer stripping device adopting a multi-item water circulation structure proposed by the present invention; Figure 4 Schematic structural diagram of the external communication pipeline in a waste plastic product electroplating layer stripping device adopting a multi-item water circulation structure proposed by the present invention; Figure 5 In a waste plastic product electroplating layer stripping device adopting a multi-item water circulation structure proposed by the present invention Figure 1 Cross-sectional view; Figure 6 Schematic structural diagram of the lower tray in a waste plastic product electroplating layer stripping device adopting a multi-item water circulation structure proposed by the present invention; Figure 7 Bottom view of the hanging basket in a waste plastic product electroplating layer stripping device adopting a multi-item water circulation structure proposed by the present invention.

[0016] In the figure: 1. Outer kettle body; 101. Drainage inclined part; 2. Outer AC pipeline; 201. First-order liquid injection port; 202. Clear liquid port; 203. Second-order liquid injection port; 204. Clear material bin; 205. Pressure empty bin; 206. Liquid bin; 3. Pump body; 4. Hanging basket; 401. Yielding chute; 5. Multi-pass circulation pipe; 6. Liquid storage rubber balloon; 7. Piston block; 8. Lower tray; 9. Top position column. Detailed implementation mode

[0017] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative work belong to the scope of protection of the present invention.

[0018] Embodiment 1: For the process of electroplating layer stripping in the recycling operation of waste plastic products, taking the principle of acid solution corrosion for de-plating as an example, it is difficult to master the dosage of the medicine and the reaction speed during the overall operation process, and a large amount of cleaning water is consumed during the overall process. Therefore, the following technical solutions are proposed: Refer to Figures 1 - 7 , the waste plastic product electroplating layer stripping equipment adopting a multi-item water circulation structure in this embodiment includes an outer kettle body 1, a hanging basket 4 and a hoisting machine. The hanging basket 4 is used to hold waste plastic products, and the hanging basket 4 is placed inside the outer kettle body 1. The outer kettle body 1 is provided with a lower tray 8 and a liquid storage rubber balloon 6 in the direction from top to bottom along the position corresponding to the lower side of the hanging basket 4; There are multiple groups of outer AC pipelines 2 at the external position of the outer kettle body 1. The hanging basket 4 moves up and down inside the outer kettle body 1 through a hoisting machine. The hoisting machine is a common instrument with a hoisting function in the prior art, and will not be specifically limited and described here. The liquid storage rubber balloon 6 is filled with an acid solution medium, and the acid solution medium inside it is injected into the outer kettle body 1 through the up and down movement of the hanging basket 4; A multi-interface component is arranged between the outer AC pipeline 2 and the outer kettle body 1. The multi-interface component includes a first-order liquid injection port 201, a clear liquid port 202, and a second-order liquid injection port 203. A drainage inclined part 101 is installed at the upper end position of the outer kettle body 1. The drainage inclined part 101 is used for the temporary storage structure of the hanging basket 4. The lower tray 8 is slidably connected along the vertical direction at the inner wall position of the outer kettle body 1. The liquid storage rubber balloon 6 is installed at the bottom end position inside the outer kettle body 1, and the liquid storage rubber balloon 6 is communicated with the lower end position of the outer AC pipeline 2.

[0019] Working principle: Since the issue of destruction does not need to be directly considered in the process of recycling waste plastic products, the present invention is mainly based on the corrosion process of the electroplating layer by an acid solution medium. Its essence is to directly immerse the waste plastic products to be treated in the acid solution medium. After reacting for a certain period of time, the electroplating layer is corroded by the acid solution medium and dissolved in the acid solution medium, thus achieving the purpose of pickling and removing the plating. However, the present invention optimizes the above operation process as follows: S1: The hanging basket 4 is a structure for holding waste plastic products. Specifically, it is lifted into the inner part of the outer kettle body 1 by a hoisting machine. When a certain amount of acid solution medium is injected into the inner part of the outer kettle body 1, it is necessary to ensure that the acid solution medium completely covers the waste plastic products. After the acid solution medium completely immerses the waste plastic products for a certain period of time, during this process, the hoisting machine can also be used to drive the hanging basket 4 to reciprocate in the vertical direction. The purpose is to ensure that the acid solution medium fully contacts the electroplating layer, initially improving the pickling and de-plating efficiency. S2: In addition, when the waste plastic products need to be further cleaned after pickling, however, during the transfer process, the acid solution medium that may remain on the waste plastic products will affect the external environment. Therefore, in the overall process, the clear water outlet 202 is used as the spraying structure for the cleaning water. Specifically, a high-pressure atomizing nozzle can be added at the position of the clear water outlet 202, and the second-order liquid injection port 203 is used as the injection end of the cleaning water. The cleaning water is sprayed out along the position of the high-pressure atomizing nozzle through a high-pressure water pump. Specifically, the cleaning is carried out synchronously during the process of taking out the hanging basket 4 from the inner part of the outer kettle body 1. S3: Based on the content of S2, after cleaning the waste plastic products inside the hanging basket 4 with the cleaning water, the hanging basket 4 does not need to be directly transferred. Instead, the hanging basket 4 can be placed in the draining inclined part 101. The draining inclined part 101 is essentially a supporting structure extended from the outer kettle body 1, and the draining inclined part 101 is inclined along the direction corresponding to the outer kettle body 1 to ensure that the remaining cleaning water slowly drains out, and finally the hanging basket 4 and the waste plastic products inside it after draining are transferred again.

[0020] Embodiment 2: Supplementary description of the multi-interface component on the external communication pipeline: A piston block 7 is arranged in the external communication pipeline 2 along the opening positions of the first-order liquid injection port 201 and the clear water outlet 202. The first-order liquid injection port 201 and the clear water outlet 202 are arranged in the up-down direction. The clear water outlet 202 is arranged at a position higher than the upper surface of the hanging basket 4. Inside the external communication pipeline 2, a cleaning material bin 204, a pressure empty bin 205, and a liquid bin 206 are respectively arranged along the up-down direction by two piston blocks 7. The setting position between the second-order liquid injection port 203 and the cleaning material bin 204 matches.

[0021] Scheme description: Based on Example 1, in the initial state, there is no acid medium inside the overall outer kettle body 1. The acid medium is specifically stored inside the liquid storage rubber balloon 6. Specifically, after the hanging basket 4 containing waste plastic products is placed inside the outer kettle body 1, it generates a downward pressure on the lower tray 8, and the lower tray 8 squeezes the liquid storage rubber balloon 6 downward, causing the acid medium stored inside it to continuously inject into the external communication pipeline 2. For this part, refer to Figure 5 , after the acid medium enters the liquid storage chamber 206, the piston block 7 at the lower position bears an upward thrust until the first-order liquid injection port 201 is exposed, so that the acid medium is injected into the outer kettle body 1, and the acid medium completely submerges the upper surface position of the hanging basket 4; It should be noted in combination with the above content that the pressure empty chamber 205 will not communicate with the first-order liquid injection port 201 and the clear liquid port 202. For this, the set length of the piston block 7 needs to be restricted. The essence of the pressure empty chamber 205 is to inject liquid in the middle position corresponding to the two piston blocks 7. Because the compression ratio of water is relatively low, when the acid medium continuously injects into the liquid storage chamber 206, both piston blocks 7 will move upward. In this process, the set position of the clear liquid port 202 needs to be further restricted to ensure that the liquid level height of the acid medium will not be higher than the clear liquid port, so as to avoid the acid medium contaminating the cleaning water; After completing the pickling and de-plating according to the relevant content introduced in Example 2, when the hanging basket 4 is lifted, the liquid storage rubber balloon 6 inside loses the squeezing effect from the lower tray 8 and is directly connected to the second-order liquid injection port 204 in the form of a high-pressure water pump structure, and the cleaning water is injected in a high-pressure form. In this process, the two piston blocks 7 lose the upward thrust, and instead generate a downward pressure according to the high-pressure cleaning water, causing the two piston blocks 7 to move downward; In this process, because there is already acid medium inside the outer kettle body 1, the pump body 3 on the multi-pass circulation pipe 5 needs to be started. Its essence is to pump out the acid medium inside the outer kettle body 1 and transfer it to the liquid storage chamber 206. However, due to the downward movement of the two piston blocks 205, specifically, the piston block 7 at the lower position re-blocks the first-order liquid injection port 201, then the acid medium pumped out by the pump body 3 can only return to the liquid storage rubber balloon 6 again through the liquid storage chamber 206, so that the liquid storage rubber balloon 6 returns to the initial state again; However, the injection process of the cleaning water is divided into two stages. The first stage is used to drive the downward movement distance of the two piston blocks 205. The key is to ensure that the piston block 7 at the lower position blocks the first-order liquid injection port 201, but the clear liquid port 202 is still blocked by the piston block 7 at the upper position. The purpose of this part is to give the pump body 3 enough running time to ensure that all the acid medium inside the outer kettle body 1 is pumped back into the liquid storage rubber balloon 6; The second stage is that after the acid medium inside the outer kettle body 1 is pumped out, under the continuous high-pressure form of the cleaning water, ensure that the piston block 7 at the upper position moves downward and exposes the clear liquid port; During this process, the hanging basket 4 continues to move upward, and during the upward movement, the cleaning water sprayed from the clear flow outlet 202 fully cleans the waste plastic products inside the hanging basket 4, and the fallen cleaning water continues to remain at the bottom end of the outer kettle body 1. During this process, the used cleaning water can be discharged through the drain pipe provided in the multi-pass circulation pipe 5, and finally the cleaned hanging basket 4 is placed in the drain slope 101, and the next pickling and deplating process is continued. What needs to be briefly explained in this part is that the residual amount of cleaning water after cleaning is low, and will not directly affect the pH value of the pickling medium in the next pickling and deplating.

[0022] Example 3: Combining Example 1 and Example 2, the release and recovery process of the acid medium or cleaning water is supplemented: A cooperative guide rod corresponding to the hanging basket 4 and the liquid storage rubber balloon 6 is installed at the center point of the lower tray 8. The cooperative guide rod is arranged in the vertical direction. A makeshift inclined groove 401 is opened on the lower surface of the hanging basket 4. The makeshift inclined groove 401 is arranged in a circular array along the center point of the hanging basket 4. A top column 9 corresponding to the makeshift inclined groove 401 is installed on the upper surface of the lower tray 8.

[0023] Solution description: Because the present invention mainly uses the pickling process of the pickling medium, after a single pickling and plating removal is completed, it is necessary to measure the pH value of the acid medium present in the liquid rubber balloon 6. According to the acid corrosion principle, the reaction between metal and acid can consume and reduce the hydrogen ion concentration, thereby increasing the pH. The amount of hydrogen ion substances consumed by strong acid and weak acid is certain. When the acidity is greater, the amount of substance concentration in the solution itself is smaller, so the pH change is greater. In the weak acid solution, due to weak ionization, the acid mainly exists in the form of molecules. The reduction of hydrogen ion concentration is conducive to the right shift of the ionization equilibrium, so the pH change is small. Therefore, in the overall solution, the pH value of the acid medium is used to judge the effective efficiency of pickling and plating removal. However, the type of acid medium needs to be selected according to the composition of the electroplating layer. The relevant parameters are not explained here, and the specific manifestation is the relevant change of the pH value. And refer to Figure 7 and Figure 6 To illustrate, after the hanging basket 4 moves down to the position of the lower tray 8, each top column 9 can be used to support the hanging basket 4, but if Figure 7 The structural form of the middle chute 401 is that the chute 401 is arranged in an arc shape along the center point of the hanging basket 4, and its inner surface is an arc surface. The hanging basket 4 will rotate slightly under the interference of the chute 401 and the top column 9, and its purpose is to further stir the waste plastic products contained therein to improve the pickling efficiency.

[0024] In summary, the pickling immersion method is used as the basic principle for removing the coating, and based on this, relevant operating actions are optimized. The hanging basket can move up and down inside the outer kettle body, mainly to stir the waste plastic products placed inside. The difference is that in the process of releasing the acid medium, it mainly depends on the up and down movement of the hanging basket, and the up and down movement process is used to improve the pickling and coating removal efficiency, which is specifically reflected in the two processes of releasing / recovering the acid medium. In combination with the pickling process and the releasing / recovering process of the acid medium, the two processes of releasing / recovering the cleaning water are further optimized, and the pH value of the acid medium is synchronously and real-time monitored to judge the effective capacity during the pickling process, so as to improve the overall coating removal efficiency in this way.

[0025] The above content is only an example and explanation of the structure of the present invention. Those skilled in the art of this technology can make various modifications or supplements to the described specific embodiments or use similar methods to replace them. As long as they do not deviate from the structure of the invention or exceed the scope defined by this claim book, they should belong to the protection scope of the present invention.

Claims

1. The waste plastic product electroplating layer stripping equipment adopting a multi-item water circulation structure includes an outer kettle body (1), a hanging basket (4) and a hoisting machine, and is characterized in that, The hanging basket (4) is used to hold waste plastic products, and the hanging basket (4) is placed inside the outer kettle body (1). The outer kettle body (1) is provided with a lower tray (8) and a liquid storage rubber balloon (6) in a direction from top to bottom at a position corresponding to the lower side of the hanging basket (4). A plurality of external exchange pipes (2) are provided on the exterior of the outer kettle body (1); the hanging basket (4) is moved vertically inside the outer kettle body (1) by a hoisting machine; an acid medium is injected into the liquid storage rubber balloon (6); and the acid medium in the liquid storage rubber balloon (6) is injected into the interior of the outer kettle body (1) by the vertical movement of the hanging basket (4); A multi-interface component is provided between the external exchange pipe (2) and the external kettle body (1), wherein the multi-interface component comprises a first-order liquid injection port (201), a clear flow port (202), and a second-order liquid injection port (203).

2. The waste plastic product electroplating layer stripping device adopting a multi-item water circulation structure according to claim 1, characterized in that, A drain slope (101) is installed at the upper end of the outer kettle body (1), and the drain slope (101) is used as a temporary storage structure for the hanging basket (4).

3. The electroplating layer stripping device for waste plastic products adopting a multi-item water circulation structure according to claim 1, characterized in that, The lower tray (8) is slidably connected to the inner wall of the outer kettle body (1) in the vertical direction, and the liquid storage rubber balloon (6) is installed at the bottom end of the inner portion of the outer kettle body (1), and the liquid storage rubber balloon (6) is connected to the lower end of the outer exchange pipe (2).

4. The waste plastic product electroplating layer stripping equipment adopting a plurality of water circulation structures according to claim 3, characterized in that, A piston block (7) is provided in the external exchange pipe (2) along the opening positions of the first-order liquid injection port (201) and the clear flow port (202); the first-order liquid injection port (201) and the clear flow port (202) are arranged in a direction from bottom to top; the clear flow port (202) is arranged at a position higher than the upper surface of the hanging basket (4).

5. The waste plastic product electroplating layer stripping device adopting a multi-item water circulation structure according to claim 1, characterized in that, A material clearing bin (204), a pressure empty bin (205) and a liquid bin (206) are respectively provided inside the external exchange pipe (2) via two piston blocks (7) along a top-to-bottom direction, and the second-stage liquid injection port (203) is arranged at a position matching that of the material clearing bin (204).

6. The electroplating layer stripping equipment for waste plastic products adopting a multi-item water circulation structure according to claim 5, characterized in that, A multi-pass circulation pipe (5) is connected between the bottom end of the outer kettle body (1) and the liquid tank (206), and the multi-pass circulation pipe (5) includes a liquid discharge pipe arranged vertically downward at a position corresponding to the center point of the outer kettle body (1), and a pump body (3) is arranged on the multi-pass circulation pipe (5).

7. The waste plastic product electroplating layer stripping device adopting a plurality of water circulation structures according to claim 1, characterized in that, A cooperating guide rod corresponding to the hanging basket (4) and the liquid storage rubber balloon (6) is installed at the center point of the lower tray (8), and the cooperating guide rod is arranged in the vertical direction.

8. The waste plastic product electroplating layer stripping device adopting a multi-item water circulation structure according to claim 1, characterized in that, A slanted groove (401) is provided on the lower surface of the hanging basket (4), and the slanted grooves (401) are arranged in a circular array along the center point of the hanging basket (4). A top column (9) corresponding to the slanted groove (401) is installed on the upper surface of the lower tray (8).

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