Waste plastic recycling cleaning equipment and waste plastic cleaning and recycling production line

Abstract

The present invention discloses a waste plastic recycling cleaning device and a waste plastic cleaning and recycling production line using the waste plastic recycling cleaning device, which includes a homogenizing feeding screw, a sand washing channel for receiving materials from the homogenizing feeding screw, and a sand water recycling device for receiving the sand water medium from the sand washing channel. The sand washing channel includes a plurality of cleaning pipes connected in sequence. A stirring and conveying rod is disposed inside each of the plurality of cleaning pipes. For two adjacent cleaning pipes, the cleaning pipe in the front position can stir and convey the materials to the cleaning pipe in the rear position through the stirring and conveying rod. The sand water recycling device is used for purifying the received sand water medium and respectively conveying the treated sand and water to the homogenizing feeding screw and the sand washing channel. The present invention is used to solve the disadvantages in the prior art, such as being prone to damaging plastics, serious water pollution, and inability to realize water recycling.

Description

Technical Field

[0001] The present invention relates to waste cleaning and recycling technology in the environmental protection industry, and particularly to a waste plastic recycling cleaning device and a waste plastic cleaning and recycling production line using the waste plastic recycling cleaning device. Background Art

[0002] Due to the soaring use of plastics, the recycling infrastructure at home and abroad cannot keep up, resulting in serious marine pollution by waste plastics. With the increasing emphasis on environmental protection, the recycling of waste plastics has risen to a national strategic issue. Therefore, an automated, intelligent, and low-cost waste plastic cleaning and recycling system is particularly important. The process flow of the existing waste plastic cleaning and recycling production line is roughly divided into four parts, namely the rough washing stage, the fine washing stage, the secondary water washing stage, and the air separation, centrifugal dehydration, and packing stage. Among them, the plastic cleaning device used in the fine washing stage is a key module in the plastic cleaning and recycling production line. The existing plastic cleaning and recycling processes on the domestic and foreign markets generally adopt high-speed centrifugal cleaning, add cleaning agents to the hot washing water tank, and then apply corresponding blade hitting force to the materials through high-speed rotation speed to achieve the cleaning effect of plastic sheets.

[0003] However, the above plastic cleaning process has the following disadvantages: First, high-speed centrifugal cleaning, due to its high rotation speed and large impact force on materials, will damage the plastics, and in severe cases, even grind them into powder. Second, adding cleaning agents will cause water pollution and does not meet environmental protection requirements. Third, the cleaning water cannot be recycled, resulting in a large amount of sewage discharge, causing waste of water resources and again causing water pollution. Summary of the Invention

[0004] In order to overcome the deficiencies of the prior art, the purpose of the present invention is to provide a waste plastic recycling cleaning device and a waste plastic cleaning and recycling production line using the waste plastic recycling cleaning device, which are used to solve the problems of easy damage to plastics, serious water pollution, and inability to realize water cycle utilization in the prior art.

[0005] The waste plastic recycling cleaning device of the present invention is realized by the following technical solutions:

[0006] A waste plastic recycling cleaning device includes a homogenizing feeding screw, a sand washing channel for receiving materials from the homogenizing feeding screw, and a sand water recycling device for receiving sand water medium from the sand washing channel. The sand washing channel includes a plurality of cleaning pipes connected in sequence. Each of the plurality of cleaning pipes is internally provided with a stirring and conveying rod. For two adjacent cleaning pipes, the front cleaning pipe can stir and convey the materials to the rear cleaning pipe through the stirring and conveying rod. The sand water recycling device is used to purify the received sand water medium and respectively convey the treated sand and water to the homogenizing feeding screw and the sand washing channel.

[0007] Further, the stirring and conveying rod includes a main shaft, and spiral blades and stirring blades alternately arranged on the main shaft.

[0008] Further, the first cleaning pipe among the multiple cleaning pipes is provided with a feed inlet of the sand washing channel, each of the remaining cleaning pipes is provided with an input port for communicating with the previous cleaning pipe, the last cleaning pipe among the multiple cleaning pipes is provided with a discharge outlet of the sand washing channel, and each of the remaining cleaning pipes is provided with an output port for communicating with the subsequent cleaning pipe.

[0009] Further, a connecting pipe fitting is connected between two adjacent cleaning pipes. One end of the connecting pipe fitting is connected to the output port of the previous cleaning pipe, and the other end is connected to the input port of the subsequent cleaning pipe. The output port connected by the same connecting pipe fitting is higher than the input port it connects.

[0010] Further, two adjacent cleaning pipes and the connecting pipe fitting therebetween together form a bent pipeline, so that the sand washing channel forms a circuitous channel structure.

[0011] Further, the multiple cleaning pipes are arranged horizontally, and the output port and the input port are arranged in the horizontal direction of the cleaning pipes. The multiple cleaning pipes all form an upward angle relative to the horizontal plane, and the upward directions of two adjacent cleaning pipes are opposite.

[0012] Further, the waste plastic recycling cleaning equipment further includes a sand and water leakage tank. The multiple cleaning pipes are composed of at least one sand grinding spiral and at least one separation spiral. A spray head is arranged at the top of the separation spiral, and a sieve hole is arranged at the bottom, so that the sand and water medium can enter the sand and water leakage tank through the sieve hole. The sand and water leakage tank is located above the sand water recycling device, so that the sand water recycling device can receive the sand and water medium through the sand and water leakage tank.

[0013] Further, the sand water recycling device includes a sand collecting box for receiving the sand and water medium, a sewage collecting box arranged on one side of the sand collecting box, a swirl aerator arranged inside the sand collecting box, and a scraping mechanism arranged on the top of the sand collecting box. The scraping mechanism is used to scrape the impurities in the sand and water medium into the sewage collecting box.

[0014] Further, the sand water recycling device further includes a sand discharging spiral connected to the bottom of the sand collecting box, a sand water pump communicating with the sand collecting box, and a flotation machine communicating with the sewage collecting box. The sand discharging spiral is used to convey the sand material to the homogenizing feed spiral, the sand water pump is used to pump the water in the sand collecting box to the sand washing channel, and the flotation machine is used to receive the sewage from the sewage collecting box and convey the purified water to the sand washing channel.

[0015] The waste plastic cleaning and recycling production line of the present invention is realized by the following technical solutions:

[0016] A waste plastic cleaning and recycling production line, characterized in that: it includes the above-mentioned waste plastic circulating cleaning equipment.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] The waste plastic circulating cleaning equipment provided by the present invention and the waste plastic cleaning and recycling production line adopting the waste plastic circulating cleaning equipment increase the effective cleaning stroke through the structural form of a combination of multiple cleaning pipes. Therefore, even by operating at a low rotational speed, it can fully stir the materials and the cleaning medium. Through the combination of a long stroke and a low rotational speed, it can not only ensure sufficient stirring and cleaning but also effectively avoid the drawback of damaging the plastic. In addition, the cleaning medium uses sand and water, which does not cause pollution to the environment and can achieve the purpose of environmental protection; and the recycling device can purify the sand and water, enabling the sand and water medium to be recycled, effectively reducing the sewage discharge volume and reducing water resource waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is the front view of the waste plastic circulating cleaning equipment according to the embodiment of the present invention;

[0020] Figure 2 is Figure 1 the side view of the waste plastic circulating cleaning equipment shown;

[0021] Figure 3 is Figure 1 the top view of the waste plastic circulating cleaning equipment shown;

[0022] Figure 4 is Figure 1 the front view of the sand washing channel of the waste plastic circulating cleaning equipment shown;

[0023] Figure 5 is Figure 4 the side view of the sand washing channel shown;

[0024] Figure 6 is Figure 4 the top view of the sand washing channel shown;

[0025] Figure 7 is Figure 4 the structural schematic diagram of the stirring and conveying rod adopted by the sand washing channel shown;

[0026] Figure 8 is Figure 7 the partial structure diagram of the stirring and conveying rod shown;

[0027] Figure 9 is Figure 1The front view of the sand-water recycling device of the waste plastic recycling cleaning equipment shown;

[0028] Figure 10 is Figure 9 The side view of the sand-water recycling device shown;

[0029] Figure 11 is Figure 9 The top view of the sand-water recycling device shown.

[0030] In the figure: 1, homogenizing feeding screw; 2, sand washing channel; 3, sand-water recycling device; 21, cleaning pipe; 211, stirring and conveying rod; 11, bottom inlet; 12, middle inlet; 13, top outlet; 2111, main shaft; 2112, spiral blade; 2113, stirring blade; 2114, reverse spiral piece; 2115, push plate; 22, feeding port; 212, input port; 23, discharging port; 213, output port; 24, connecting pipe fitting; 4, sand-water leakage tank; 31, sand collecting box; 32, dirt collecting box; 33, swirl aerator; 34, scraping mechanism; 35, sand discharging screw; 36, sand-water pump; 37, air flotation machine; 321, sewage outlet flange; 311, water outlet flange. Specific embodiments

[0031] Next, in combination with the accompanying drawings and specific embodiments, the present invention will be further described. It should be noted that, on the premise of no conflict, the following-described embodiments or technical features can be arbitrarily combined to form new embodiments.

[0032] The embodiment of the present invention provides a waste plastic recycling cleaning equipment and a waste plastic cleaning and recycling production line using the waste plastic recycling cleaning equipment. The waste plastic recycling cleaning equipment can be used as a cleaning equipment in the fine washing stage of the waste plastic cleaning and recycling production line, and can solve the problems in the prior art such as easy damage to plastics, serious water pollution, and inability to realize water recycling.

[0033] Refer to Figures 1 - 11 . The waste plastic recycling cleaning equipment provided in this embodiment includes a homogenizing feeding screw 1, a sand washing channel 2 for receiving materials from the homogenizing feeding screw 1, and a sand-water recycling device 3 for receiving sand-water medium from the sand washing channel 2. The sand washing channel 2 includes a plurality of cleaning pipes 21 connected in sequence. Each of the plurality of cleaning pipes 21 is internally provided with a stirring and conveying rod 211. For two adjacent cleaning pipes 21, the cleaning pipe 21 in the front position can stir and convey the materials to the cleaning pipe 21 in the rear position through the stirring and conveying rod 211. The sand-water recycling device 3 is used to purify the received sand-water medium, and respectively convey the treated sand and water to the homogenizing feeding screw 1 and the sand washing channel 2. Specifically, the homogenizing feeding screw 1 is provided with a bottom inlet 11, a middle inlet 12, and a top outlet 13.

[0034] Specifically, the stirring and conveying rod 211 includes a main shaft 2111, and spiral blades 2112 and stirring blades 2113 alternately arranged on the main shaft 2111. A reverse spiral piece 2114 is further provided at the tail end of the main shaft 2111. A push plate 2115 is provided between the reverse spiral piece 2114 and the nearest spiral blade 2112, and the push plate 2115 can facilitate the pushing out of materials.

[0035] Specifically, the first cleaning pipe 21 among the multiple cleaning pipes 21 is provided with a feeding port 22 of the sand washing channel 2, and each of the remaining cleaning pipes 21 is provided with an input port 212 for communicating with the previous cleaning pipe 21. The last cleaning pipe 21 among the multiple cleaning pipes 21 is provided with a discharging port 23 of the sand washing channel 2, and each of the remaining cleaning pipes 21 is provided with an output port 213 for communicating with the next cleaning pipe 21.

[0036] Specifically, a connecting pipe fitting 24 is connected between two adjacent cleaning pipes 21. One end of the connecting pipe fitting 24 is connected to the output port 213 of the previous cleaning pipe 21, and the other end is connected to the input port 212 of the next cleaning pipe 21. The output port 213 connected by the same connecting pipe fitting 24 is higher than the input port 212 it connects. That is, for two adjacent cleaning pipes 21, the height of the output port 213 of the previous pipe is higher than the height of the input port 212 of the next pipe, so that the materials can smoothly enter the next pipe from the previous pipe. Specifically, the connecting pipe fitting 24 is a pipe flange.

[0037] Specifically, two adjacent cleaning pipes 21 and the connecting pipe fitting 24 therebetween together form a bent pipeline, so that the sand washing channel forms a meandering channel structure. The meandering channel structure can increase the effective cleaning stroke while reducing the space occupation.

[0038] Specifically, in order to make the output port 213 connected by the same connecting pipe fitting 24 higher than the input port 212 it connects, the cleaning pipes 21 in this embodiment can be arranged as follows: the multiple cleaning pipes 21 are arranged horizontally, and the output port 213 and the input port 212 are arranged in the horizontal direction of the cleaning pipes 21. The multiple cleaning pipes 21 all form an upward angle relative to the horizontal plane, and the upward directions of two adjacent cleaning pipes 21 are opposite.

[0039] Specifically, the waste plastic recycling cleaning equipment of this embodiment further includes a sand and water leakage trough 4. Multiple cleaning pipes 21 are composed of at least one sand grinding spiral and at least one separation spiral. A spray head is arranged at the top of the separation spiral, and a sieve hole (with a diameter larger than sand and smaller than plastic sheets) is arranged at the bottom, so that the sand and water medium can enter the sand and water leakage trough 4 through the sieve hole. The sand and water leakage trough 4 is located above the sand water recycling device 3, so that the sand water recycling device 3 can receive the sand and water medium through the sand and water leakage trough 4. Specifically, in this embodiment, there are a total of eight cleaning pipes 21, and the first six are all sand grinding spirals, and the last two are all separation spirals.

[0040] Specifically, the sand water recycling device 3 includes a sand collecting box 31 for receiving the sand and water medium, a sewage collecting box 32 arranged on one side of the sand collecting box 31, a swirl aerator 33 arranged inside the sand collecting box 31, and a scraper mechanism 34 arranged on the top of the sand collecting box 31. The scraper mechanism 34 is used to scrape the impurities in the sand and water medium into the sewage collecting box 32.

[0041] The sand water recycling device 3 further includes a sand discharging spiral 35 connected to the bottom of the sand collecting box 31, a sand water pump 36 communicating with the sand collecting box 31, and a flotation machine 37 communicating with the sewage collecting box 32. The sand discharging spiral 35 is used to convey the sand material to the homogenizing feeding spiral 1, the sand water pump 36 is used to pump the water in the sand collecting box 31 to the sand washing channel 2, and the flotation machine 37 is used to receive the sewage from the sewage collecting box 32 and convey the purified water to the sand washing channel 2.

[0042] Specifically, the swirl aerator 33 is arranged inside the sand collecting box 31 in a hoisting manner, with a certain distance from the bottom of the sand collecting box 31; the sand discharging spiral 35 is arranged obliquely, and its lower end is connected to the bottom of the sand collecting box 31. The main function of the swirl aerator 33 is to make the sewage and sand swirl, playing the role of sand washing, and at the same time, it can bring impurities such as suspended garbage and oil stains in the sand water to the water surface.

[0043] Specifically, the sewage collecting box 32 is provided with a sewage discharge port flange 321, which is used to connect with the sewage pump attached to the flotation machine 37, so as to convey the sewage to the flotation machine 37; a water outlet flange 311 is arranged in the middle of the sand collecting box 31, and the water inlet flange of the sand water pump 36 is connected to the water outlet flange 311 through a water pipe.

[0044] The process flow of this embodiment is: the homogenizing feeding spiral conveys the mixed material → the sand grinding spiral in the sand washing channel stirs and conveys the material → the separation spiral separates the sand and water → obtain clean plastic sheets and sand water recycling

[0045] Specifically as follows:

[0046] (a) First, the mixture of shredded waste plastic sheets, sand, and water is conveyed to the inlet 22 of the sand washing channel 2 through the homogenizing feeding spiral 1.

[0047] (b) The variable-frequency speed-regulating motor drives the stirring and conveying rod 211 to rotate at a low speed. Driven by the spiral blade 2112, the mixed material of waste plastic sheets, sand, and water in the six sanding spirals is continuously pushed forward. At the same time, under the tumbling and stirring of the stirring blade 2113, sufficient grinding and washing are achieved.

[0048] (c) Since the bottoms of the last two spirals are provided with sieve holes, and high-pressure water spraying is carried out by adding nozzles at the tops of the two separation spirals, the sand and water are effectively separated and leak into the sand and water leakage trough 4 and are concentrated and fed into the sand collecting box 31 of the sand water recycling device 3; while the plastic sheets continue to be pushed forward under the action of the spiral blade 2112, and finally clean plastic sheets are obtained and discharged through the discharge port 23.

[0049] (d) The recycling of sand and water includes two parts: First, the sand collected in the sand collecting box 31 continuously precipitates at the bottom of the sand collecting box 31 and is transported by the sand discharging spiral 35 to the middle inlet 12 of the homogenizing feeding spiral 1, and then is transported by the homogenizing feeding spiral 1 to the feeding port 22 to realize the recycling of sand. Second, the water collected in the sand collecting box 31 is divided into two paths. One path is that because the water is dirty after cleaning, the scraper mechanism 34 will scrape the suspended garbage and oil dirt and other impurities into the sewage collecting box 32 and pump them to the air flotation machine 37 for sewage treatment and then back to the nozzle inlets of the two separation spirals for spraying; the other path is that the relatively clean water is pumped by the sand water pump 36 from the outlet at the upper-middle water level in the sand collecting box 31 to the feeding port 22 for recycling.

[0050] The waste plastic recycling cleaning equipment provided by the present invention and the waste plastic cleaning and recycling production line adopting the waste plastic recycling cleaning equipment increase the effective cleaning stroke through the structural form of a combination of multiple cleaning pipes 21. Therefore, the method of low-speed operation can also fully stir the materials. Through the combination of long stroke and low speed, it can not only ensure sufficient stirring and cleaning but also effectively avoid the drawback of damaging the plastic. In addition, the cleaning medium uses sand and water, which does not cause pollution to the environment and can achieve the purpose of environmental protection; and the recycling device can purify the sand and water, enabling the sand and water medium to be recycled, effectively reducing the sewage discharge volume and reducing water resource waste.

[0051] To achieve the combination of long stroke and low speed, it is necessary to ensure that the materials and the cleaning medium can smoothly pass through each cleaning pipe 21 of the sand washing channel 2. Then two points must be ensured: First, ensure that the materials can be stirred and transported to the position where the output port 213 or the discharge port 23 is located in the same cleaning pipe 21, that is, ensure effective stirring and transportation in the pipe. Second, ensure that the materials can be smoothly transferred from the front pipe to the rear pipe, that is, ensure effective transportation between the pipes.

[0052] Since the stirring rods in the prior art are mainly applicable to high-speed centrifugal cleaning, there are problems of low conveying efficiency. When they operate at low speeds, they often cannot effectively convey materials, especially not suitable for long-stroke material conveyance, and the materials at the tail end of the pipe are prone to blockage. In the stirring and conveying rod 211 of this embodiment, spiral blades 2112 and stirring blades 2113 are alternately arranged on its main shaft 2111. Therefore, it can not only ensure sufficient stirring and cleaning, but also effectively convey materials in the pipe, that is, realize effective stirring and transportation in the pipe. Moreover, a reverse spiral piece 2114 is arranged at the end of the stirring and conveying rod 211 to prevent material blockage. A push plate 2115 is arranged between the reverse spiral piece 2114 and its nearest spiral blade 2112, which can conveniently transfer the materials smoothly to the next cleaning pipe 21, that is, realize effective transportation between pipes.

[0053] The above embodiments are only the preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art on the basis of the present invention belong to the scope of protection required by the present invention.

Claims

1. A waste plastic recycling and cleaning device, characterized in that: It includes a homogenizing feeding screw, a sand washing channel for receiving materials from the homogenizing feeding screw, and a sand water recycling device for receiving the sand water medium from the sand washing channel. The sand washing channel includes a plurality of cleaning pipes connected in sequence. Each of the plurality of cleaning pipes is internally provided with a stirring and conveying rod. For two adjacent cleaning pipes, the cleaning pipe in the front position can stir and convey the materials to the cleaning pipe in the rear position through the stirring and conveying rod. The sand water recycling device is used to purify the received sand water medium and respectively convey the treated sand and water to the homogenizing feeding screw and the sand washing channel; The stirring and conveying rod includes a main shaft, and spiral blades and stirring blades alternately arranged on the main shaft. A reverse spiral piece is further arranged at the tail end of the main shaft, and a push plate is arranged between the reverse spiral piece and the nearest spiral blade; The cleaning pipe in the first position among the plurality of cleaning pipes is provided with a feeding port of the sand washing channel. Each of the remaining cleaning pipes is provided with an input port for communicating with the previous cleaning pipe. The cleaning pipe in the last position among the plurality of cleaning pipes is provided with a discharging port of the sand washing channel. Each of the remaining cleaning pipes is provided with an output port for communicating with the next cleaning pipe; A connecting pipe fitting is connected between two adjacent cleaning pipes. One end of the connecting pipe fitting is connected to the output port of the cleaning pipe in the front position, and the other end is connected to the input port of the cleaning pipe in the rear position. The output port connected by the same connecting pipe fitting is higher than the input port it is connected to; Two adjacent cleaning pipes and the connecting pipe fitting therebetween together form a bent pipeline, so that the sand washing channel forms a meandering channel structure; The plurality of cleaning pipes are arranged horizontally, and the output port and the input port are arranged in the horizontal direction of the cleaning pipe. The plurality of cleaning pipes all form a rising angle relative to the horizontal plane, and the rising directions of two adjacent cleaning pipes are opposite; The waste plastic recycling cleaning equipment further includes a sand water leakage trough. The plurality of cleaning pipes are composed of at least one sand grinding screw and at least one separation screw. A spray head is arranged at the top of the separation screw, and a sieve hole is arranged at the bottom, so that the sand water medium can enter the sand water leakage trough through the sieve hole. The sand water leakage trough is located above the sand water recycling device, so that the sand water recycling device can receive the sand water medium through the sand water leakage trough; The sand water recycling device includes a sand collecting box for receiving the sand water medium, a dirt collecting box arranged on one side of the sand collecting box, a swirl aerator arranged inside the sand collecting box, and a scraping mechanism arranged on the top of the sand collecting box. The scraping mechanism is used to scrape the impurities in the sand water medium into the dirt collecting box; The sand water recycling device further includes a sand discharging screw connected to the bottom of the sand collecting box, a sand water pump communicating with the sand collecting box, and a flotation machine communicating with the dirt collecting box. The sand discharging screw is used to convey the sand to the homogenizing feeding screw. The sand water pump is used to pump the water in the sand collecting box to the sand washing channel. The flotation machine is used to receive the sewage from the dirt collecting box and convey the purified water to the sand washing channel.

2. A waste plastic cleaning and recycling production line, characterized in that: It includes the waste plastic recycling and cleaning equipment as described in Claim 1.

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