Recovery equipment for waste plastic parts in household appliances

Abstract

The invention discloses recycling equipment for waste plastic parts in household appliances, and relates to the field of mixed plastic part recycling, the recycling equipment comprises a pulverizer, a conveying belt and a cleaning mechanism arranged at the straight part of the conveying belt, a separation box is further arranged below the tail end of the inclined part of the conveying belt, and a saturated sodium chloride solution is contained in the separation box; the saturated saline solution is used for separating the plastic broken particles and the impurity broken particles, so that the plastic broken particles floating on the surface of the solution are high-purity plastic broken particles, the effect is good, and the cost is low. And a special pushing mechanism is designed, so that liquid leakage can be prevented, and discharging is facilitated. In addition, the plastic particles are cleaned once through the cleaning mechanism before entering the separation box, so that the pollution degree of the saturated saline solution can be greatly reduced, the service life of the solution in the separation box is prolonged, and the cleaning period is slowed down. And the cleaning water can be recycled and is simply purified in the circulating process, so that the cyclic utilization rate of the cleaning water is improved and the replacement period of the cleaning water is shortened without increasing extra cost.

Description

Technical Field

[0001] The invention relates to the field of recycling mixed plastic parts, and in particular to a recycling device for waste plastic parts in household appliances. Background Art

[0002] Plastics discarded at will will cause white pollution and are difficult to degrade. In addition, waste plastics, especially waste plastic parts in household appliances, themselves have recycling value. Therefore, as people's environmental awareness increases, plastic recycling and reuse has become an important means of resource regeneration and green environmental protection.

[0003] However, in the actual recycling process of waste plastic parts in household appliances, there is a problem of mixed materials. For example, waste electrical circuit boards are plastic substrates mixed with metals, silicon compounds and other miscellaneous materials. Some plastic parts are covered with metal rings or metal coils, some plastic connectors are nailed with metal screws, and some plastic parts are connected to metal or graphite heat sinks, etc. It is a common state for plastic parts in household appliances that various miscellaneous materials are connected to plastic parts in various ways, and it is difficult to separate various miscellaneous materials from plastics. This is a key point that makes it difficult to recycle waste plastic parts in household appliances.

[0004] Although the total content of these impurities may not be high, if they are not distinguished, the final recycled plastic will contain a lot of metals and other impurities, resulting in uneven quality of recycled plastics, making it difficult to guarantee the quality of products produced using the recycled plastics. In addition, some impurities themselves have high recycling value, so how to carry out refined recycling so that the impurities in the final recycled plastic are as small as possible, while allowing valuable impurities to be effectively recycled, is an urgent problem to be solved in this industry.

[0005] At present, a relatively effective recycling method that can separate impurities is to heat-melt waste plastic parts. Since the melting point of these impurities is generally different from that of plastics, it is easy to separate the plastics after liquefaction. At that time, hot-melt plastics required a lot of electricity. In addition, various other resources were consumed during the plastic recycling process, such as clean water for washing waste plastics, which directly led to a significant increase in recycling costs. In addition, there are many types of plastic materials in plastic parts. Hot-melt plastics easily mix different types of plastics together, which will also lead to problems such as poor quality of the recycled plastics obtained in the end. Summary of the invention

[0006] In view of this, the purpose of the present invention is to propose a recycling device for waste plastic parts in household appliances, so as to solve the technical problem in the prior art of how to finely recycle without using the hot melt method, so that the impurities in the final recycled plastic are as small as possible and valuable miscellaneous materials can also be effectively recycled.

[0007] Based on the above purpose, the present invention provides a recycling device for waste plastic parts in household appliances, including a crusher for crushing the waste plastic parts into small particles, and the recycling device also includes:

[0008] A conveyor belt for conveying plastic particles, the conveyor belt consists of a straight portion for horizontal conveying at the front side and an inclined portion for conveying obliquely upward at the rear side. The front end of the conveyor belt is located below the discharge pipe of the pulverizer, and the plastic particles crushed by the pulverizer are transferred to the conveyor belt through the discharge pipe;

[0009] The cleaning mechanism located at the straight part of the conveyor belt is used to wash away the oil and sand in the plastic particles;

[0010] A separation box is provided below the end of the inclined portion of the conveyor belt, wherein the separation box is filled with a saturated sodium chloride solution, a plastic collection box is fixedly connected to the upper right side of the separation box, and a heavy object collection box is fixedly connected to the bottom right side of the separation box;

[0011] The separation box is also provided with a plastic pushing mechanism for pushing the floating plastic particles into the plastic collecting box and a sundry material pushing mechanism for pushing the settled sundry materials into the heavy material collecting box.

[0012] Furthermore, the plastic collection box is connected to the separation box through a discharge port, and the heavy object collection box is directly connected to the separation box. A sealing float is also provided at the discharge port, and the sealing float is slidably connected to the inner wall of the separation box, and the density of the sealing float is less than the density of the saturated sodium chloride solution.

[0013] Furthermore, the plastic propulsion mechanism includes a multi-stage hydraulic cylinder fixedly connected to the upper left side surface of the separation box and a water filter push plate movably connected in the separation box. The water filter push plate is movably connected to the front end of the multi-stage telescopic rod of the multi-stage hydraulic cylinder, and the water filter push plate is facing the plastic collection box.

[0014] Furthermore, the miscellaneous material pushing mechanism includes a multi-stage hydraulic cylinder fixedly connected to the bottom of the left side of the separation box and a water-proof push plate slidably connected in the separation box. The water-proof push plate is fixedly connected to the front end of the multi-stage telescopic rod of the multi-stage hydraulic cylinder, and the water-proof push plate is facing the heavy object collection box.

[0015] Furthermore, a water leakage net is provided at the bottom of the inner cavity of the plastic collection box and the heavy object collection box, which is used to separate and filter plastic particles and solution and miscellaneous material particles and solution respectively. The bottom ends of the plastic collection box and the heavy object collection box are respectively connected to a liquid extraction pipe connected thereto, and the other end of the liquid extraction pipe is connected to a liquid extraction pump.

[0016] Furthermore, a sliding bar is fixedly connected to the back side of the water filter push plate, and the sliding bar is slidably connected in the corresponding groove at the front end of the multi-stage telescopic rod, and vertical movable grooves are provided on both side walls of the water filter push plate, and a movable sliding rod is movably connected in the movable groove. A horizontal sliding groove is provided at the position on both side walls of the separation box that contacts the water filter push plate, and the other end of the movable sliding rod is slidably connected in the sliding groove.

[0017] Furthermore, the cleaning mechanism includes a cleaning bin and a water storage tank. The cleaning bin is installed on the top of the conveyor belt, and the water storage tank is installed on the bottom of the conveyor belt. A cleaning cavity is provided in the cleaning bin, and a water storage cavity is provided in the water storage tank. The cleaning cavity and the water storage cavity are connected through a mesh nylon conveyor belt, and a plurality of nozzles are provided on the top of the cleaning bin.

[0018] Furthermore, the nozzle is connected to a water pump through a water pipe, and the water pump is also connected in sequence through a secondary water storage tank, a secondary water pumping pipe, a primary water storage tank and a primary water pumping pipe, and one end of the primary water pumping pipe is located in the water accumulation chamber.

[0019] Furthermore, a primary water pump is provided at the bottom of the inner cavity of the primary water storage tank, and the primary water pump is connected to the other end of the primary water pumping pipe. A secondary water pump is provided at the bottom of the inner cavity of the secondary water storage tank, and the secondary water pump is connected to the secondary water pumping pipe.

[0020] Furthermore, the port of the secondary pumping pipe located in the primary water storage tank is located in the upper half of the primary water storage tank, the port of the secondary pumping pipe located in the secondary water storage tank is located at the bottom of the secondary water storage tank, and the water inlet port of the pipe connecting the water pump and the secondary water storage tank is also located at the bottom of the secondary water storage tank.

[0021] The advantages of the present invention are: 1. Since the materials of plastics in electrical appliances are generally PE, PP, PC, PA and other common materials, the density of these plastics is generally not more than 1.2g / cm 3 , so the density is 1.33g / cm 3 Saturated salt water is used to separate plastic particles from miscellaneous material particles, which is effective and low in cost. It can make the plastic particles floating on the surface of the solution high-purity plastic particles, thereby making the content of various impurities in the final recycled plastic very small.

[0022] 2. The discharge port for discharging plastic particles is equipped with a sealing floating plate that can float slightly above the surface of the solution. Even if the height of the solution fluctuates, the plastic particles floating on the surface of the solution are always at the same height as the exposed discharge port, which is convenient for discharge. At the same time, the exposed discharge port is always higher than the upper surface of the solution to prevent leakage.

[0023] 3. A water filter push plate that can move up and down is set up, and together with a sealing floating plate with an arc surface on the upper end surface, it can effectively push the plastic particles floating on the surface of the solution into the plastic collection box through the discharge port, while minimizing the amount of solution carried out.

[0024] 4. Before entering the separation box, the plastic fragments will first be cleaned by the cleaning mechanism to remove the oil and sand in the plastic fragments, and then the residual water will be filtered out through the inclined part of the conveyor belt, which can greatly reduce the degree of contamination of the saturated salt water, increase the service life of the solution in the separation box, and slow down the cleaning cycle.

[0025] 5. The water used to clean the plastic particles will be recycled. During the circulation process, the sediment will be precipitated through the primary water storage tank, and then the upper clear liquid will be taken, and then the oil will be separated through the secondary water storage tank. Since the oil floats on the water surface, the secondary water storage tank will take the lower clear liquid. Therefore, the water quality is greatly improved after the circulation, which increases the recycling rate of the cleaning water, reduces the replacement cycle of the cleaning water, and saves costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the present invention or 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 in the following description are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 It is a schematic diagram of the overall structural principle of the present invention.

[0028] Figure 2 It is a top view of the device of the present invention.

[0029] Figure 3 It is a schematic diagram of the structural principle of the cleaning mechanism of the present invention.

[0030] Figure 4 It is a schematic diagram of the structural principle of the water circulation part of the cleaning mechanism of the present invention.

[0031] Figure 5 It is a schematic diagram of the structural principle of the separation box in the device of the present invention.

[0032] Figure 6 It is a schematic diagram of the internal structure of the separation box before the material pushing mechanism of the present invention pushes the material.

[0033] Figure 7 It is a schematic diagram of the internal structure of the separation box after the material pushing mechanism in the present invention pushes the material.

[0034] Figure 8 It is a schematic diagram of the structural principle of the water filtering push plate in the device of the present invention.

[0035] The markings in the figure are: 101, crusher, 102, discharge pipe, 103, conveyor belt, 104, cleaning chamber, 105, water storage tank, 106, guide pressure wheel, 107, side baffle, 108, primary water pumping pipe, 109, primary water storage tank, 110, secondary water pumping pipe, 111, secondary water storage tank, 112, water pump, 113, water pipe, 114, nozzle, 115, cleaning chamber, 116, water storage chamber, 117, primary water pumping Pump, 118, two-stage water pump, 201, separation box, 202, multi-stage hydraulic cylinder, 203, multi-stage telescopic rod, 204, water filter push plate, 205, water-isolating push plate, 206, discharge port, 207, sealing floating plate, 208, plastic collection box, 209, heavy object collection box, 210, leakage net, 211, liquid extraction pipe, 212, liquid extraction pump, 213, slide, 214, movable groove, 215, movable slide bar, 216, slide bar.

[0036] Specific implementation method and principle

[0037] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0038] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0039] A first aspect of the present invention, as Figure 1 and Figure 2 As shown, the overall recycling system for waste plastic parts in household appliances of the present invention mainly consists of three parts, wherein the first part is mainly composed of a crusher 101. The function of the crusher 101 is to crush the waste plastic parts in household appliances into small plastic particles, preferably into plastic particles of a size that can be directly used as raw materials. If this is not possible, the high-purity plastic particles obtained after the plastic particles pass through the entire waste plastic parts recycling system can be screened, granulated, and other operations can be performed.

[0040] The plastic particles crushed by the crusher 101 are conveyed to the second part of the system through the discharge pipe 102.

[0041] The second part of the system is the conveyor belt 103 and the cleaning mechanism. The cleaning mechanism is mainly composed of a cleaning bin 104 and a water storage tank 105. Therefore, the outlet end of the discharge pipe 102 extends into the cleaning bin 104 and is located above the front end of the conveyor belt 103.

[0042] Specifically, Figure 3 and Figure 4 As shown, the cleaning chamber 104 is installed on the top of the conveyor belt 103, the water storage tank 105 is installed on the bottom of the conveyor belt 103, a cleaning chamber 115 is provided in the cleaning chamber 104, a water storage chamber 116 is provided in the water storage tank 105, the cleaning chamber 115 and the water storage chamber 116 are connected through the mesh nylon conveyor belt 103, and a plurality of nozzles 114 are provided on the top of the cleaning chamber 104. The conveyor belt 103 can also be a mesh plastic, etc., as long as the conveyor belt 103 can carry and transport plastic particles while having the function of filtering water and oil, dirt and sand.

[0043] The nozzle 114 is connected to the water pump 112 through the water pipe 113, and the water pump 112 is connected to the secondary water storage tank 111, the secondary water pumping pipe 110, the primary water storage tank 109 and the primary water pumping pipe 108 in sequence, and one end of the primary water pumping pipe 108 is located in the water accumulation cavity 116. A primary water pump 117 is provided at the bottom of the inner cavity of the primary water storage tank 109, and the primary water pump 117 is connected to the other end of the primary water pumping pipe 108. A secondary water pump 118 is provided at the bottom of the inner cavity of the secondary water storage tank 111, and the secondary water pump 118 is connected to the secondary water pumping pipe 110.

[0044] Therefore, water is sprayed through the nozzle 114 to rinse the plastic particles on the conveyor belt 103 below, and the oil and mud in the plastic particles are cleaned. The clean water will carry the oil and mud through the water accumulation chamber 116 below the flow channel of the conveyor belt 103, and then be pumped away through the first-level pumping pipe 108, and then circulated and purified through the first-level water storage tank 109, the second-level pumping pipe 110, and the second-level water storage tank 111, and finally pressurized by the water pump 112 and re-delivered to the nozzle 114 through the water pipe 113 to realize the cleaning water circulation.

[0045] The key point is that the circulation and purification function of the primary water tank 109, the secondary water pumping pipe 110 and the secondary water tank 111 is realized by placing the port of the secondary water pumping pipe 110 in the primary water tank 109 at the upper part of the primary water tank 109. Since the sediment will settle at the bottom of the primary water tank 109, the sediment content in the upper clear liquid in the primary water tank 109 extracted by the secondary water pump 118 through the secondary water pumping pipe 110 is greatly reduced. The port of the secondary water pumping pipe 110 in the secondary water tank 111 is located at the bottom of the secondary water tank 111, and the water inlet port of the pipeline connecting the water pump 112 and the secondary water tank 111 is also located at the bottom of the secondary water tank 111. Since the oil floats on the water surface, the oil content of the lower clear liquid in the secondary water storage tank 111 extracted by the water delivery pump 112 will be greatly reduced, so the water quality after circulation is greatly improved, the recycling rate of the cleaning water is increased, the replacement cycle of the cleaning water is reduced, and the cost is saved.

[0046] The cleaned plastic particles are transported to the separation box 201 below the end of the conveyor belt 103 through the inclined portion. The conveyor belt 103 consists of a straight portion for horizontal transport at the front side and an inclined portion for transporting obliquely upward at the rear side. A guide roller 106 is provided at the bend. The guide roller 106 presses the conveyor belt 103 and rotates with it, so that the conveyor belt 103 bends and turns. The guide roller 106 is connected to the side baffles 107 on both sides of the conveyor belt 103 when rotating, and there are a lot of gaps on both sides of the guide roller 106, so it does not affect the passage of plastic particles. The side baffles 107 are provided to prevent plastic particles and water from sliding off from both sides of the conveyor belt 103.

[0047] The third part of this system is the separation component mainly composed of the separation box 201. Figure 5 , Figure 6 and Figure 7 As shown, there is a horizontal stage at the end of the conveyor belt 103, and the separation box 201 is located below the conveyor belt 103 at the horizontal stage. The separation box 201 is filled with a saturated sodium chloride solution (unsaturated is also possible, but the density of the sodium chloride solution must be at least greater than 1.2g / cm 3 ). Since the materials of plastics in electrical appliances are generally PE, PP, PC, PA and other common types, the density of these plastics generally does not exceed 1.2g / cm 3 , so the density is 1.33g / cm 3 Saturated salt water can separate plastic particles from debris particles. (Similar density of 1.2g / g / cm 3 The above solution replaces the saturated salt water solution)

[0048] The debris particles are mainly metal particles, silicide particles, and particles of metal / silicide combined with plastic. The density of these particles is basically much greater than 1.33g / cm 3 , so it will settle to the bottom of the solution in the separation box 201. The plastic particles that can float on the surface of the solution are basically high-purity plastic particles, so the content of various impurities in the recycled plastic obtained in the end is very small and the quality is very high.

[0049] On the other hand, it is necessary to solve the problem of how to remove the floating plastic particles and the precipitated debris particles separately. The floating plastic particles can be removed by salvaging, and then the solution is drained and the precipitated debris particles are removed. However, this method is not only troublesome, but also interrupts the automated production line operation of the system.

[0050] Therefore, this system adopts another West-East mechanism for operation, such as Figure 7 and Figure 8 As shown, a plastic collecting box 208 is fixedly connected to the upper right side of the separation box 201, a heavy object collecting box 209 is fixedly connected to the bottom right side of the separation box 201, and the separation box 201 is also provided with a plastic propulsion mechanism for pushing floating plastic particles into the plastic collecting box 208 and a miscellaneous material propulsion mechanism for pushing settled miscellaneous materials into the heavy object collecting box 209.

[0051] The plastic collection box 208 is connected to the separation box 201 through the discharge port 206, and the heavy object collection box 209 is directly connected to the separation box 201. In order to prevent the solution from leaking through the discharge port 206, a sealing floating plate 207 is also provided at the discharge port 206. The sealing floating plate 207 is slidably connected to the inner wall of the separation box 201, and the density of the sealing floating plate 207 is less than the density of the saturated sodium chloride solution. Therefore, the upper end of the sealing floating plate 207 can float at a position slightly higher than the surface of the solution, always blocking the solution, even if the height of the solution fluctuates, the exposed discharge port 206 is always higher than the upper surface of the solution to prevent leakage, and the plastic particles floating on the surface of the solution are always at the same height as the exposed discharge port 206, which is convenient for discharge.

[0052] When discharging plastic particles, it is only necessary to push the floating plastic particles through the discharge port 206 into the plastic collection box 208 by the plastic propulsion mechanism. Specifically, the plastic propulsion mechanism includes a multi-stage hydraulic cylinder 202 fixedly connected to the upper left side of the separation box 201 and a water filter push plate 204 movably connected in the separation box 201. The water filter push plate 204 is movably connected to the front end of the multi-stage telescopic rod 203 of the multi-stage hydraulic cylinder 202, and the water filter push plate 204 is facing the plastic collection box 208. Therefore, it is only necessary to start the multi-stage hydraulic cylinder 202 on the upper left side of the separation box 201 to realize automatic plastic particle discharge.

[0053] When the water filter push plate 204 reaches the sealing float 207, the water filter push plate 204 will push the floating plastic particles to slide along the arc-shaped upper end surface of the sealing float 207 to the upper end of the sealing float 207, so that the plastic particles leave the solution surface and finally enter the plastic collection box 208 through the discharge port 206. In order to achieve this effect, a slide bar 216 is fixedly connected to the back of the water filter push plate 204, and the slide bar 216 is slidably connected to the corresponding groove at the front end of the multi-stage telescopic rod 203, and the two side walls of the water filter push plate 204 are provided with vertical movable grooves 214, and the movable slide bar 215 is movably connected in the movable groove 214. The two side walls of the separation box 201 are each provided with a horizontal slide groove 213 at the position in contact with the water filter push plate 204, and the other end of the movable slide bar 215 is slidably connected in the slide groove 213.

[0054] Therefore, by providing a water filter push plate 204 that can move up and down, in conjunction with a sealing float 207 with an arc surface on the upper end surface, the plastic particles floating on the surface of the solution can be effectively pushed into the plastic collection box 208 through the discharge port 206, while minimizing the amount of solution carried out.

[0055] The discharge of the precipitated debris particles is operated by a debris pushing mechanism, which includes a multi-stage hydraulic cylinder 202 fixedly connected to the bottom of the left side of the separation box 201 and a water-proof push plate 205 slidably connected in the separation box 201, and the water-proof push plate 205 is fixedly connected to the front end of the multi-stage telescopic rod 203 of the multi-stage hydraulic cylinder 202, and the water-proof push plate 205 is facing the heavy object collection box 209.

[0056] When discharging miscellaneous material particles, it is only necessary to start the multi-stage hydraulic cylinder 202 at the bottom of the left side of the separation box 201. The multi-stage hydraulic cylinder 202 drives the water-proof push plate 205 to push the precipitated miscellaneous material particles into the heavy object collection box 209, and finally the water-proof push plate 205 will be inserted into the connecting port between the heavy object collection box 209 and the separation box 201, and block the connecting port, so that the heavy object collection box 209 is in a closed state.

[0057] Since the bottom of the inner cavity of the plastic collection box 208 and the heavy object collection box 209 are both provided with a leaky net 210, they are used to separate and filter plastic particles and solution and miscellaneous material particles and solution respectively, and the bottom ends of the plastic collection box 208 and the heavy object collection box 209 are respectively connected to a liquid extraction pipe 211 connected thereto, and the other end of the liquid extraction pipe 211 is connected to a liquid extraction pump 212.

[0058] Therefore, after the heavy object collection box 209 is in a closed state, the liquid pump 212 is started, and the liquid pump 212 extracts the residual solution in the heavy object collection box 209 and the plastic collection box 208 through the liquid extraction tube 211. The extracted solution can be temporarily stored in a liquid storage tank or directly transported to the separation box 201 to maintain the balance of the solution amount in the separation box 201.

[0059] After the solutions in the plastic collection box 208 and the heavy object collection box 209 are completely pumped out, the plastic collection box 208 and the heavy object collection box 209 are opened to take out the plastic particles and sundry material particles therein for subsequent processing. DETAILED DESCRIPTION

[0060] First, the waste plastic parts in the household appliances are collected and recycled in batches, and a batch of waste plastic parts is poured into the crusher 101, which crushes the waste plastic parts in the household appliances into small plastic particles, and then conveys the plastic particles to the conveyor belt 103 in the cleaning bin 104 through the discharge pipe 102. After the crusher 101 crushes the waste plastic parts in this batch and sends them out, the next batch is poured in.

[0061] The nozzle 114 at the top of the cleaning bin 104 starts to spray water. Therefore, before this batch of plastic particles is sent out of the cleaning bin 104 by the conveyor belt 103, they will be rinsed with clean water to wash away the oil and mud in the plastic particles. The clean water will carry the oil and mud through the water accumulation chamber 116 under the flow channel of the conveyor belt 103, and then be pumped away through the first-level pumping pipe 108. After circulating and purifying through the first-level water storage tank 109, the second-level pumping pipe 110, and the second-level water storage tank 111, it is finally pressurized by the water pump 112 and transported through the water pipe 113 to the nozzle 114 for spraying to realize the cleaning water circulation.

[0062] The cleaned plastic particles pass through the guide pressure wheel 106 to the inclined portion of the conveyor belt 103. The inclined conveyor belt 103 conveys the plastic particles to the top of the separation box 201 and finally falls into the saturated sodium chloride solution in the separation box 201. This process will also cause the residual water in the plastic particles to be further lost, reducing the impact on the saturated sodium chloride solution.

[0063] After the plastic particles enter the saturated sodium chloride solution, the debris particles are mainly metal particles, silicide particles, and particles of metal / silicide combined with plastic. The density of these particles is basically much greater than 1.33g / cm 3 , so it will settle to the bottom of the solution in the separation box 201. The plastic particles that can float on the surface of the solution are basically high-purity PE, PP, PC, PA and other plastic particles, so the content of various impurities in the recycled plastics obtained in the end is very small and the quality is very high.

[0064] Then the multi-stage hydraulic cylinder 202 is started, and the two groups of multi-stage hydraulic cylinders 202 drive the water filter push plate 204 and the water isolation push plate 205 to move rightward along the chute, respectively, pushing the plastic particles floating on the surface of the solution and the debris particles settled to the bottom of the solution to move rightward, wherein when the water filter push plate 204 reaches the position of the sealing float 207, the water filter push plate 204 will push the floating plastic particles to slide along the arc-shaped upper end surface of the sealing float 207 to the upper end of the sealing float 207, so that the plastic particles leave the surface of the solution and finally enter the plastic collection box 208 through the discharge port 206. The water isolation push plate 205 pushes the settled debris particles into the heavy object collection box 209, and finally the water isolation push plate 205 will plug the connecting port between the heavy object collection box 209 and the separation box 201, and block the connecting port, so that the heavy object collection box 209 is in a closed state.

[0065] Finally, the liquid pump 212 is started, and the liquid pump 212 extracts the residual solution in the heavy object collection box 209 and the plastic collection box 208 through the liquid extraction pipe 211, and the extracted solution is directly transported to the separation box 201 to maintain the balance of the solution amount in the separation box 201. After the solution in the plastic collection box 208 and the heavy object collection box 209 is completely extracted, the plastic collection box 208 and the heavy object collection box 209 are opened again, and the plastic particles and miscellaneous material particles therein are taken out for subsequent processing.

[0066] Based on the above, the present invention adopts a density of 1.33g / cm 3 The saturated salt water is used to separate plastic particles from miscellaneous material particles, which has good effect and low cost. It can make the plastic particles floating on the surface of the solution high-purity plastic particles, and a sealing float 207 that can float slightly higher than the surface of the solution is provided at the discharge port 206 for discharging the plastic particles. Even if the height of the solution fluctuates, the plastic particles floating on the surface of the solution are always at the same height as the exposed discharge port 206, which prevents leakage and facilitates discharge. A water filter push plate 204 that can move up and down is provided, and in conjunction with the sealing float 207 with an arc surface on the upper end surface, the plastic particles floating on the surface of the solution can be effectively pushed into the plastic collection box 208 through the discharge port 206, while minimizing the amount of solution carried out. In addition, the plastic shreds before entering the separation box 201 will first be cleaned by the cleaning mechanism to clean the oil and sand in the plastic shreds, and then the residual water will be filtered out by the inclined portion of the conveyor belt 103, which can greatly reduce the degree of contamination of the saturated salt water, increase the service life of the solution in the separation box 201, and slow down the cleaning cycle. The water used to clean the plastic shreds will be recycled. During the circulation process, the silt will be precipitated through the primary water storage tank 109, and then the upper clear liquid will be taken, and then the oil will be separated through the secondary water storage tank 111. Since the oil floats on the water surface, the lower clear liquid will be taken from the secondary water storage tank 111. Therefore, the water quality after circulation is greatly improved, the recycling rate of the cleaning water is increased, the replacement cycle of the cleaning water is reduced, and the cost is saved.

[0067] It should be understood by those skilled in the art that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present invention, including the claims, is limited to these examples; within the context of the present invention, the technical features in the above embodiments or in different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

[0068] The present invention is intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A recycling device for waste plastic parts in household appliances, comprising a crusher (101) for crushing the waste plastic parts into small particles, characterized in that: The recycling device also includes: A conveyor belt (103) for conveying plastic granules, the conveyor belt (103) comprising two parts: a straight part for horizontal conveying at the front side and an inclined part for conveying obliquely upward at the rear side, the front end of the conveyor belt (103) being located below a discharge pipe (102) of a pulverizer (101), and the plastic granules crushed by the pulverizer (101) are transferred to the conveyor belt (103) through the discharge pipe (102); A cleaning mechanism provided at the straight portion of the conveyor belt (103) is used to wash away oil and sand in the plastic particles; A separation box (201) is provided below the end of the inclined portion of the conveyor belt (103), wherein the separation box (201) contains a saturated sodium chloride solution, a plastic collection box (208) is fixedly connected to the upper portion of the right side surface of the separation box (201), and a heavy object collection box (209) is fixedly connected to the bottom portion of the right side surface of the separation box (201); The separation box (201) is also provided with a plastic propulsion mechanism for pushing floating plastic particles into the plastic collection box (208) and a sundry material propulsion mechanism for pushing settled sundry materials into the heavy material collection box (209).

2. The recycling device for waste plastic parts in household appliances according to claim 1, characterized in that: The plastic collection box (208) is in communication with the separation box (201) via a discharge port (206), and the heavy object collection box (209) is in direct communication with the separation box (201). A sealing floating plate (207) is also provided at the discharge port (206), and the sealing floating plate (207) is slidably connected to the inner wall of the separation box (201), and the density of the sealing floating plate (207) is less than the density of a saturated sodium chloride solution.

3. The recycling device for waste plastic parts in household appliances according to claim 1 or 2, characterized in that: The plastic propulsion mechanism comprises a multi-stage hydraulic cylinder (202) fixedly connected to the upper left side surface of the separation box (201) and a water filter push plate (204) movably connected to the separation box (201), the water filter push plate (204) being movably connected to the front end of the multi-stage telescopic rod (203) of the multi-stage hydraulic cylinder (202), and the water filter push plate (204) is directly opposite to the plastic collection box (208).

4. The recycling device for waste plastic parts in household appliances according to claim 1 or 2, characterized in that: The miscellaneous material propulsion mechanism comprises a multi-stage hydraulic cylinder (202) fixedly connected to the bottom of the left side of the separation box (201) and a water-blocking push plate (205) slidably connected in the separation box (201), wherein the water-blocking push plate (205) is fixedly connected to the front end of the multi-stage telescopic rod (203) of the multi-stage hydraulic cylinder (202), and the water-blocking push plate (205) faces the heavy object collection box (209).

5. The recycling device for waste plastic parts in household appliances according to claim 1, characterized in that: The bottom of the inner cavity of the plastic collection box (208) and the heavy object collection box (209) are both provided with a water leakage net (210) for separating and filtering plastic particles and solution and miscellaneous material particles and solution, respectively. The bottom ends of the plastic collection box (208) and the heavy object collection box (209) are respectively connected to a liquid extraction pipe (211) communicating therewith, and the other end of the liquid extraction pipe (211) is connected to a liquid extraction pump (212).

6. The recycling device for waste plastic parts in household appliances according to claim 3, characterized in that: A slide bar (216) is fixedly connected to the back of the water filter push plate (204), and the slide bar (216) is slidably connected to the corresponding groove at the front end of the multi-stage telescopic rod (203), and vertical movable grooves (214) are provided on the two side walls of the water filter push plate (204), and a movable slide bar (215) is movably connected in the movable groove (214). A horizontal slide groove (213) is provided at the position on the two side walls of the separation box (201) that contacts the water filter push plate (204), and the other end of the movable slide bar (215) is slidably connected in the slide groove (213).

7. The recycling device for waste plastic parts in household appliances according to claim 1, characterized in that: The cleaning mechanism comprises a cleaning chamber (104) and a water storage tank (105); the cleaning chamber (104) is installed on the top of the conveyor belt (103); the water storage tank (105) is installed on the bottom of the conveyor belt (103); a cleaning chamber (115) is provided in the cleaning chamber (104); a water storage chamber (116) is provided in the water storage tank (105); the cleaning chamber (115) and the water storage chamber (116) are connected through the mesh nylon conveyor belt (103); and a plurality of nozzles (114) are provided on the top of the cleaning chamber (104).

8. The recycling device for waste plastic parts in household appliances according to claim 7, characterized in that: The nozzle (114) is connected to the water pump (112) via a water pipe (113); the water pump (112) is also connected in sequence via a secondary water storage tank (111), a secondary water pumping pipe (110), a primary water storage tank (109) and a primary water pumping pipe (108); one end of the primary water pumping pipe (108) is located in the water accumulation chamber (116).

9. The device for recycling waste plastic parts in household appliances according to claim 8, characterized in that: A primary water pump (117) is provided at the bottom of the inner cavity of the primary water storage tank (109), and the primary water pump (117) is connected to the other end of the primary water pumping pipe (108). A secondary water pump (118) is provided at the bottom of the inner cavity of the secondary water storage tank (111), and the secondary water pump (118) is connected to the secondary water pumping pipe (110).

10. The recycling device for waste plastic parts in household appliances according to claim 8, characterized in that: The port of the secondary water pumping pipe (110) located in the primary water storage tank (109) is located at the upper half of the primary water storage tank (109), the port of the secondary water pumping pipe (110) located in the secondary water storage tank (111) is located at the bottom of the secondary water storage tank (111), and the water inlet port of the pipeline connecting the water delivery pump (112) and the secondary water storage tank (111) is also located at the bottom of the secondary water storage tank (111).

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