A PET bottle flake washing machine

Abstract

The present invention discloses a PET bottle flakes washing machine, comprising an unpacking device, a floating washing device, a rinsing device, a flushing device and a drying device. The semi-clean bottle flakes are unpacked by the unpacking machine, and are sent to the floating washing device by the unpacking conveyor belt to remove the metal dirt and other high-density impurities in the PET bottle flakes. The cleaned PET bottle flakes are automatically salvaged and sent to the rinsing device by the second blower. The impurities such as glue attached to the PET bottle flakes are removed by rinsing with high-temperature alkaline water. After automatic salvage, the third feeding blower sends them to the hot water flushing device, and the high-temperature and high-pressure hot water is used to thoroughly clean the PET bottle flakes to meet the requirements of high-quality PET bottle flakes. The cleaned PET bottle flakes are sent to the drying device by the fourth blower, and the drying time is automatically adjusted by the humidity detection system. After meeting the requirements of the humidity of high-quality PET bottle flakes, they are sent to the discharge port for standby. The process is simple, the manual operation is convenient, the water resource waste is small, the noise is small, the floor space is small, and the sorted PET bottle flakes are of high quality.

Description

Technical Field

[0001] The invention relates to the field of resource recycling, in particular to a plastic bottle recycling process, and specifically to a PET bottle flake washing machine. Background Art

[0002] The chemical formula of polyethylene terephthalate is -OCH2-CH2OCOC6H4CO-. Its English name is polyethyleneterephthalate, or PET for short. It is a high polymer obtained by the dehydration condensation reaction of ethylene terephthalate. Ethylene terephthalate is obtained by the esterification reaction of terephthalic acid and ethylene glycol. PET is a milky white or light yellow, highly crystalline polymer with a smooth and shiny surface. It has excellent physical and mechanical properties in a wide temperature range, and its long-term use temperature can reach 120°C. It has excellent electrical insulation properties, and its electrical properties are still good even at high temperature and high frequency, but its corona resistance is poor, and its creep resistance, fatigue resistance, friction resistance, and dimensional stability are all very good.

[0003] Consumers are not aware enough of the importance of recycling PET bottles, which results in a variety of waste mixed in the recycled PET bottles. The existing PET recycling process has the following disadvantages: poor cleaning effect, substandard cleanliness of the obtained plastic fragments, and high cleaning costs, which have a huge impact on further processing. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an integrated fully automatic design, simple process, convenient manual operation, water saving, low noise, small footprint, and a PET bottle flake washing machine that can sort out high-quality PET bottle flakes that are free of dust, soil, impurities, labels, and other types of plastics (such as PVC plastic bottle flakes).

[0005] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

[0006] A PET bottle flake washing machine comprises an external shell and an unpacking device, a floating washing device, a rinsing device, a flushing device, a drying device and a control device arranged inside the shell; the control device comprises a controller arranged on the outside of the top of the shell, and the unpacking device, the floating washing device, the rinsing device and the drying device are electrically connected to the controller respectively; the rinsing device is arranged on one side of the floating washing device, the flushing device is arranged at the bottom of the rinsing device, and the drying device is arranged on one side of the flushing device; a material inlet is provided on one side of the top of the shell, and a material outlet is provided on one side of the bottom of the shell; the unpacking device comprises an unpacking conveyor belt and an unpacking machine; the floating washing device comprises a container arranged under the unpacking conveyor belt The invention discloses a flotation tank, wherein a stirring device, a flotation liquid circulation and filtering device, a flotation liquid level sensor and a flotation conveyor belt are arranged in the flotation tank; the rinsing device comprises a rinsing tank, a rinsing filter tank, a rinsing circulation water pipe, a rinsing circulation booster pump, a temperature control device, a rinsing liquid level sensor, a pH value sensor and a rinsing conveyor belt; the flushing device comprises a flushing conveyor belt, a hot water nozzle and a flushing heating and pressurizing device, and the flushing heating and pressurizing device comprises a water storage tank, a heating device and a flushing circulation device; the drying device comprises a drying bin; the controller is provided with an alarm; a heat insulation layer and a sound insulation layer are arranged on the outside of the shell; the unpacking conveyor belt, the flotation conveyor belt, the rinsing conveyor belt and the flushing conveyor belt are all driven and transmitted by a conveyor belt motor.

[0007] Furthermore, one end of the unpacking conveyor belt extends out of the feed port for placing the bottle flake packages to be cleaned, and the unpacking machine is arranged above the unpacking conveyor belt for unpacking the bottle flake packages and pouring the PET bottle flakes in the bottle flake packages into the unpacking conveyor belt.

[0008] Furthermore, the flotation tank is filled with flotation liquid; an unpacking feeding trough is provided between the flotation tank and the unpacking conveyor belt, an inlet end of the unpacking feeding trough is arranged at the bottom of one end of the unpacking conveyor belt, and an outlet end of the unpacking feeding trough is arranged at the top of the flotation tank; a first feeding blower is arranged above the inlet end of the unpacking feeding trough; the stirring device comprises a stirring motor and stirring fan blades arranged on one side of the flotation tank; the flotation liquid circulation and filtering device comprises a pumping valve, a flotation liquid circulation water pipe and a flotation filter water tank, the pumping valve is arranged at the bottom of the flotation tank and is connected to the top water inlet of the flotation filter water tank through a pipeline, the bottom water outlet of the flotation filter water tank is connected to the bottom end of the flotation liquid circulation water pipe, and the top end of the flotation liquid circulation water pipe extends to the top of the flotation tank; a pumping pump is provided on the flotation liquid circulation water pipe; the flotation filter water tank is provided with an impurity filtering layer and an impurity cleaning window.

[0009] Furthermore, a rinsing feed trough is provided below one side of the rinsing tank adjacent to the floating conveyor belt, the rinsing conveyor belt is arranged on the other side of the rinsing tank, and a second feeding blower is provided above the rinsing feed trough; the temperature control device includes a rinsing heater arranged at the bottom of the rinsing tank; the two ends of the rinsing circulation water pipe are respectively connected to the two ends of the rinsing tank, the rinsing filter water box and the rinsing circulation booster pump are respectively arranged in the rinsing circulation water pipe, and a rinsing filter layer is provided in the rinsing filter water box; the rinsing liquid level sensor and the pH value sensor are arranged on the inner wall of the rinsing tank and are electrically connected to the controller respectively; alkaline water rinsing liquid is provided in the rinsing tank, one end of the rinsing conveyor belt is arranged below the liquid level of the alkaline water rinsing liquid, the other end of the rinsing conveyor belt extends to the outside of the other side edge of the rinsing tank, and a third feeding blower is provided above it.

[0010] Furthermore, the flushing conveyor belt is horizontally arranged above the water reservoir, the hot water nozzle is horizontally arranged above the flushing conveyor belt, a baffle is downwardly provided at the end of the hot water nozzle, and a high-pressure nozzle is downwardly provided at the bottom of the hot water nozzle; one side of the flushing conveyor belt is upwardly provided with a flushing feed chute extending to one side of the rinsing device; the flushing circulation device includes a flushing booster water pump, a flushing filter water tank and a flushing filter circulating water pipe arranged at the bottom of the water reservoir, the flushing booster water pump and the flushing filter water tank are connected to the water reservoir through one end of the flushing filter circulating water pipe, and the other end of the flushing filter circulating water pipe extends upward to be connected with the hot water nozzle; one end of the flushing conveyor belt extends to above the drying device; the heating device includes a heater arranged at the bottom of the water reservoir, and the heater is connected to a heating pipe fixed at the bottom of the water reservoir; a water temperature sensor and a water level sensor are provided in the water reservoir.

[0011] Furthermore, a drying feed trough extending to the corresponding end of the flushing conveyor belt is provided on the top of the drying bin, and a fourth feeding blower is provided above the drying feed trough; a discharge valve is provided at the bottom of the drying bin, and the discharge valve is communicated with the discharge port on the shell; a drying heating device and a temperature and humidity detection device are provided in the drying bin, and the drying heating device includes a drying heater and a cooling fan, and a protective filter bracket is provided on the outside of the drying heating device to separate the drying heating device from the PET bottle flakes; a breathable filter hole is provided on the top of the drying bin; the drying heater includes a heating tube arranged around the inner wall of the drying bin; the temperature and humidity detection device includes a drying temperature sensor and a drying humidity sensor, and a quantity sensor is provided on the inner wall of the drying bin.

[0012] Preferably, a rotary serpentine rinsing channel is provided on one side of the rinsing tank adjacent to the rinsing feed trough, and the rinsing conveyor belt is arranged on the other side of the rinsing tank.

[0013] Preferably, the flotation liquid comprises a NaCl solution with a density of 1.1-1.2; the flotation conveyor belt is an inclined conveyor belt, one end of which is immersed below the liquid surface of the flotation liquid and the other end extends to the outside of the edge of the flotation tank; the inclination angle of the flotation conveyor belt is 15° to 45°.

[0014] Preferably, the inclination angle of the rinsing conveyor belt is 25° to 60°; the temperature of the alkaline water rinsing liquid is 80°C to 90°C.

[0015] Preferably, the water temperature of the water reservoir is 80°-90°

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The PET bottle flakes are unpacked by the unpacking machine, and the PET bottle flakes to be cleaned are scattered onto the unpacking conveyor belt. The PET bottle flakes to be cleaned are conveyed by the unpacking conveyor belt by the first feeding blower and blown into the floating washing tank at the bottom through the unpacking feeding trough.

[0018] 2. The stirring device is used to paddle on the water surface to push the PET bottle flakes floating on the upper layer of the liquid surface toward the inclined flotation conveyor belt, and the flotation conveyor belt picks up the flotation conveyor belt and conveys them to the rinsing device; the angle of the flotation conveyor belt can be adjusted according to demand. According to the different components of different batches of PET bottle flakes, the inclination angle of the flotation conveyor belt is changed, so that other PET bottle flakes whose density does not meet the requirements may fall into the middle and lower layers of the flotation tank liquid surface, while PET bottle flakes whose density meets the requirements float on the flotation tank liquid surface or suspend in the middle and upper layers of the flotation tank liquid surface, and are easily pushed to the flotation conveyor belt by the water flow thrust generated by the movement of the stirring device, and a preliminary filtration of the PET bottle flakes is formed during the flotation washing process.

[0019] 3. The bottle flakes that have just been floated are not easy to slide from the float conveyor belt to the rinsing feed trough because they are stained with liquid. A second feeding blower is provided above the rinsing feed trough, which not only blows air with a certain temperature to the PET bottle flakes, but also pre-treats the PET bottle flakes and heats them in advance, which helps to dry the surface of the PET bottle flakes, accelerates their sliding into the rinsing pool below the rinsing feed trough, and allows them to enter the high-temperature alkaline water at a more suitable temperature, thereby improving the rinsing efficiency of the rinsing process.

[0020] 4. The high-temperature alkaline water in the rinsing pool forms a circulating flow loop through the rinsing cycle booster pump and rinsing cycle water pipe of the rinsing pool. The rotary serpentine rinsing pool increases the rinsing stroke of the PET bottle flakes in the high-temperature alkaline water of the rinsing pool. The high-speed water flow formed by the rotary serpentine water flow channel enables the PET bottle flakes to be rinsed more fully and efficiently. The screen-type rinsing conveyor belt can pick up the floating PET bottle flakes by the flow direction of the water circulation and convey them to slide onto the washing conveyor belt.

[0021] 5. The flushing booster water pump sprays the high-temperature hot water in the water reservoir from the high-pressure nozzle downward to flush the PET bottle flakes on the conveyor belt through the flushing and filtering circulating water pipe. A baffle is provided downward at the end of the hot water spray pipe to facilitate the even flattening of the PET bottle flakes on the conveyor belt during the flushing process, thereby effectively improving the flushing efficiency.

[0022] 6. The protective filter bracket of the drying chamber separates the drying and heating device from the PET bottle flakes, and diffuses the heat of the drying heater evenly to the surrounding PET bottle flakes through the cooling fan, further accelerating the drying degree. The air-permeable filter holes can discharge water vapor, maintain the dryness in the drying chamber, and improve the drying efficiency of the drying chamber.

[0023] 7. Integrated full-automatic design, simple process, convenient manual operation, water saving, low noise, small footprint, and high quality of sorted PET bottle flakes. Therefore, it saves production cleaning time, reduces environmental pollution, reduces noise pollution, saves production costs, and improves cleaning efficiency. In addition, the overall cleaning process has a good cleaning effect on PET bottle flakes, and the PET bottle flakes can be obtained by one-time cleaning, saving energy. The whole process uses circulating water to clean the bottle flakes, which reduces environmental pollution and greatly saves labor costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of components of a PET bottle flake washing machine in the present invention;

[0025] Figure 2 yes Figure 1 Schematic diagram of the structure of the mid-floating washing device;

[0026] Figure 3 yes Figure 1 A schematic diagram of the structure of the intermediate rinsing device;

[0027] Figure 4 yes Figure 1 The structural diagram of the middle flushing device;

[0028] Figure 5 yes Figure 1 The structural diagram of the drying device;

[0029] Figure 6 yes Figure 1 Schematic diagram of the structure of the thermal insulation layer and the heat insulating layer on the outer side of the middle shell;

[0030] Figure 7 It is a schematic structural diagram of a rotary serpentine rinsing channel of a rinsing tank in a second embodiment of the present invention.

[0031] Reference Numbers

[0032] Shell 101, controller 102, feed port 103, discharge port 104, discharge storage box 105, insulation layer 106, sound insulation layer 107, conveyor belt motor 108, fixed bracket 109;

[0033] Unpacking device 201, unpacking conveyor belt 202, unpacking machine 203, manipulator 204, cutter 205, unpacking feeding chute 206, first feeding blower 207;

[0034] Float washing device 301, float washing tank 302, stirring motor 303, stirring fan 304, float washing liquid level sensor 305, pumping valve 306, float washing liquid circulation water pipe 307, float washing water filter box 308, float washing conveyor belt 309, pumping pump 310, impurity cleaning window 311, second feeding blower 312;

[0035] Rinsing device 401, rinsing tank 402, rinsing filter water box 403, rinsing circulating water pipe 404, rinsing circulating booster pump 405, temperature control device 406, rinsing liquid level sensor 407, pH value sensor 408, rinsing conveyor belt 409, rinsing feeding trough 410, rinsing heater 411;

[0036] Flushing device 501, flushing conveyor belt 502, hot water spray pipe 503, water reservoir 504, flushing circulation device 505, third blower 506, baffle 507, high pressure nozzle 508, flushing feed chute 509, flushing booster water pump 510, flushing filter water tank 511, flushing filter circulation water pipe 512, heater 513, heating pipe 514, water storage temperature sensor 515, water storage liquid level sensor 516;

[0037] Drying device 601, drying bin 602, drying feed trough 603, fourth feeding blower 604, discharge valve 605, drying heater 606, cooling fan 607, protective filter bracket 608, air filter hole 609, heating tube 610, drying temperature sensor 611, drying humidity sensor 612, quantity sensor 613.

[0038] Specific embodiments and implementation methods

[0039] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention:

[0040] Depend on Figure 1-Figure 6 As shown, a PET bottle flake washing machine provided by the present invention comprises an external shell 101 and an unpacking device 201, a floating washing device 301, a rinsing device 401, a flushing device 501, a drying device 601 and a control device arranged inside the shell 101.

[0041] The control device includes a controller 102 arranged on the outer side of the top of the housing 101, and the unpacking device 201, the floating device 301, the rinsing device 401, and the drying device 601 are electrically connected to the controller 102 respectively; the rinsing device 401 is arranged on one side of the floating device 301, the flushing device 501 is arranged at the lower part of the rinsing device 401, and the drying device 601 is arranged on one side of the flushing device 501; a material inlet 103 is arranged on one side of the top of the housing 101, and a material outlet 104 is arranged on one side of the bottom of the housing 101. A heat preservation layer 106 and a sound insulation layer 107 are arranged on the outer side of the housing 101.

[0042] Depend on Figure 1 and Figure 2 As shown, specifically, the unpacking machine 203 includes an unpacking conveyor belt 202 and an unpacking device 201; the unpacking machine 203 is not a mature product of the prior art. Most of them use a manipulator 204 and a cutter 205 to cut the packaging paper and tear it or vibrate it, so that the PET bottle flakes inside are scattered on the unpacking conveyor belt 202. The unpacking machine 203 can also be disassembled in advance by hand, and the PET bottle flakes in the bag are directly poured onto the unpacking conveyor belt 202. In the embodiment of the present invention, it is preferred to use a mature unpacking machine 203 for unpacking. Specifically, one end of the unpacking conveyor belt 202 extends out of the feed port 103, which is used to place the bottle flakes package to be cleaned. The unpacking machine 203 automatically unpacks the PET bottle flakes package put into the conveyor belt, and separates the packaging bag and the PET bottle flakes. Specifically, the unpacking machine 203 is arranged above the unpacking conveyor belt 202, and is used to unpack the bottle flakes package through the manipulator 204 and the cutter 205 and pour the PET bottle flakes in the bottle flakes package into the unpacking conveyor belt 202. The unpacked PET bottle flakes are sent into the pipeline by the unpacking conveyor belt 202 and sent into the next device by the blower. The PET bottle flakes package is a semi-clean PET bottle flake package purchased and preliminarily cleaned.

[0043] Depend on Figure 2As shown, the flotation device 301 includes a flotation tank 302 arranged below the unpacking conveyor belt 202, and the flotation tank 302 is provided with a stirring device, a flotation liquid circulation and filtering device, a flotation liquid level sensor 305 and a flotation conveyor belt 309 with a perforated screen; an unpacking feeding trough 206 is provided between the flotation tank 302 and the unpacking conveyor belt 202, and an inlet end of the unpacking feeding trough 206 is arranged at the bottom of one end of the unpacking conveyor belt 202, and an outlet end of the unpacking feeding trough 206 is arranged at the top of the flotation tank 302; a first feeding blower 207 is arranged above the inlet end of the unpacking feeding trough 206; the unpacked PET bottle chips are fed into the unpacking feeding trough 206 by the unpacking conveyor belt 202, and the PET bottle chips are fed into the flotation tank 302 by the first feeding blower 207 through wind force. The stirring device includes a stirring motor 303 and a stirring blade 304 arranged on one side of the float washing tank 302; the float washing liquid circulation filtering device includes a pumping pump 310, a pumping valve 306, a float washing liquid circulation water pipe 307 and a float washing filter water tank 308, the pumping valve 306 is arranged at the bottom of the float washing tank 302 and is connected to the top water inlet of the float washing filter water tank 308 through a pipeline, the bottom water outlet of the float washing filter water tank 308 is connected to the bottom end of the float washing liquid circulation water pipe 307, and the top end of the float washing liquid circulation water pipe 307 is connected to the pumping pump 310 It is connected and extends to the top of the float washing tank 302; the float washing water filter box 308 is provided with an impurity filtering layer and an impurity cleaning window 311. The impurity filtering layer is preferably a built-in filter element. When it needs to be cleaned regularly, the impurity cleaning window 311 is opened, the filter element is taken out and cleaned, and it can be installed after cleaning. The filtering structure, water injection port (hole) and impurity cleaning (window) port and filter element sealing and fixing method in the float washing water filter box 308 are all existing technologies or can be achieved by purchasing existing finished products. The details of the water filter box structure of the present invention will not be described in detail here.

[0044] The flotation tank 302 is provided with a flotation liquid for floating and washing PET bottle flakes. The flotation liquid includes a NaCl solution with a density of 1.1-1.2; the flotation conveyor belt 309 is an inclined conveyor belt, one end of which is immersed below the liquid surface of the flotation liquid, and the other end extends to the outer side of the edge of the flotation tank 302; when the flotation conveyor belt 309 is running, it can drive the PET bottle flakes floating on the upper layer of the water surface to leave the flotation tank 302, and the inclination angle of the flotation conveyor belt 309 is 15° to 45°, and preferably 15° in this embodiment. The stirring device is used to paddle on the water surface, so that the PET bottle flakes floating on the upper layer of the liquid surface are pushed to move toward the inclined flotation conveyor 309, and are picked up by the flotation conveyor 309 and conveyed to the rinsing device 401; the angle of the flotation conveyor 309 can be adjusted according to demand, and the inclination angle of the flotation conveyor 309 is changed according to the different components of different batches of PET bottle flakes, so that other PET bottle flakes whose density does not meet the requirements may fall into the middle and lower layers of the liquid surface of the flotation tank 302, while the PET bottle flakes whose density meets the requirements float on the liquid surface of the flotation tank 302 or are suspended in the middle and upper layers of the liquid surface of the flotation tank 302, and are easily pushed to the flotation conveyor 309 by the water flow thrust generated by the movement of the stirring device, and a preliminary filtration of the PET bottle flakes is formed during the flotation process. The specific angle adjustment of the floating washing conveyor belt 309 is achieved through a liftable design at one end thereof, wherein one end is provided with a liftable movable bracket (not shown) or a cylinder bracket (not shown), etc., and the other end is a fixed bracket 109 with a conveyor motor 108, which is fixed between the two sides of the shell.

[0045] Depend on Figure 3As shown, the rinsing device 401 includes a rinsing tank 402, a rinsing filter water box 403, a rinsing circulating water pipe 404, a rinsing circulating booster pump 405, a temperature control device 406, a rinsing liquid level sensor 407, a pH value sensor 408 and a screen-type rinsing conveyor belt 409; the rinsing tank 402. A rinsing feed trough 410 is provided below one side of the rinsing tank 402 near the floating washing conveyor belt 309, and the rinsing conveyor belt 409 is arranged on the other side of the rinsing tank 402. A second feeding blower 312 is provided above the rinsing feed trough 410; the second feeding blower 312 not only blows wind with a certain temperature to the PET bottle flakes, but also pre-treats the PET bottle flakes, heats the PET bottle flakes in advance, helps the surface of the PET bottle flakes to dry, accelerates their sliding into the rinsing tank 402 below the rinsing feed trough 410, and can enter the high-temperature alkaline water at a more suitable temperature, thereby improving the rinsing efficiency of the rinsing process. The temperature control device 406 includes a rinsing heater 411 arranged at the bottom of the rinsing tank 402; the two ends of the rinsing circulation water pipe 404 are respectively connected to the two ends of the rinsing tank 402, the rinsing filter water box 403 and the rinsing circulation booster pump 405 are respectively arranged on the rinsing circulation water pipe 404 and are interconnected with each other, and a rinsing filter layer is provided in the rinsing filter water box 403. The structure of the rinsing filter water box 403 is the same as that of the floating filter water box 308, and both are filtered through a filter element. In addition, an impurity cleaning window can be provided. Clean impurities; the rinsing liquid level sensor 407 and the pH value sensor 408 are arranged on the inner wall of the rinsing tank 402 and are electrically connected to the controller 102 respectively; alkaline rinsing liquid is arranged in the rinsing tank 402, one end of the rinsing conveyor belt 409 is arranged below the liquid level of the alkaline rinsing liquid, and the other end of the rinsing conveyor belt 409 extends to the other side edge of the rinsing tank 402 and is provided with a third feeding blower 506 above that can blow the PET bottle flakes that are transported to the end after rinsing to the outside and below. The inclination angle of the rinsing conveyor belt 409 is 25° to 60°; the temperature of the alkaline rinsing liquid is 80℃-90℃. In this embodiment, the preferred inclination angle of the rinsing conveyor belt 409 is 30°; the preferred temperature of the alkaline rinsing liquid is 90℃.

[0046] Depend on Figure 4As shown, the flushing device 501 includes a screen-type flushing conveyor belt 502, a hot water spray pipe 503 and a flushing heating and pressurizing device, and the flushing heating and pressurizing device includes a water reservoir 504, a heating device, and a flushing circulation device 505; the flushing conveyor belt 502 is horizontally arranged above the water reservoir 504, and the hot water spray pipe 503 is horizontally arranged above the flushing conveyor belt 502. A baffle 507 is downwardly arranged at the end of the hot water spray pipe 503, and a high-pressure nozzle 508 is downwardly arranged at the bottom of the hot water spray pipe 503; a flushing feed chute 509 extending upward to one side of the rinsing device 401 is provided on one side of the flushing conveyor belt 502; the flushing circulation device 505 includes a flushing chute 509 arranged at the bottom of the water reservoir 504. The washing booster pump 510, the washing filter water tank 511 and the washing filter circulating water pipe 512 are connected to the water reservoir 504 through one end of the washing filter circulating water pipe, and the other end of the washing filter circulating water pipe extends upward to be connected to the hot water spray pipe 503; one end of the washing conveyor belt 502 extends to the top of the drying device 601; the heating device includes a heater 513 arranged at the bottom of the water reservoir 504, and the heater 513 is connected to a heating pipe 514 fixed at the bottom of the water reservoir 504; the water reservoir 504 is provided with a water storage temperature sensor 515 and a water storage liquid level sensor 516 electrically connected to the controller 102. The water temperature of the water reservoir 504 is 80°-90°, and in this embodiment, the water temperature of the water reservoir 504 is preferably 90°.

[0047] Depend on Figure 5 As shown, the drying device 601 includes a drying bin 602, a drying feed trough 603 extending to the corresponding end of the flushing conveyor belt 502 is provided on the top of the drying bin 602, and a fourth feeding blower 604 is provided above the drying feed trough 603; a discharge valve 605 is provided at the bottom of the drying bin 602, and the discharge valve 605 is communicated with the discharge port 104 on the shell 101; a drying heating device and a temperature and humidity detection device are provided in the drying bin 602, wherein the drying heating device includes a drying heater 606 and a cooling fan 607, and a protective filter bracket 608 is provided on the outside of the drying heating device to separate it from the PET bottle flakes; a ventilation filter hole 609 is provided on the top of the drying bin 602; the drying heater 606 includes a heating pipe 610 arranged around the inner wall of the drying bin 602; the temperature and humidity detection device includes a drying temperature sensor 611 and a drying humidity sensor 612, and a quantity sensor 613 is provided at the top entrance of the inner wall of the drying bin 602. The protective filter bracket 608 of the drying chamber 602 separates the drying and heating device from the PET bottle flakes, and diffuses the heat emitted by the drying heater evenly to the surrounding PET bottle flakes through the cooling fan 607, further accelerating the degree of drying. The air permeable filter hole 609 can discharge the water vapor evaporated from the surface of the PET bottle flakes, maintain the dryness in the drying chamber 602, and improve the drying efficiency of the drying chamber 602.

[0048] Furthermore, the controller 102 is provided with an alarm which is electrically connected to each liquid level sensor; once the liquid level is too low, the controller 102 will sound an alarm to notify the operator to replenish the cleaning liquid.

[0049] The unpacking conveyor belt 202, the floating conveyor belt 309, the rinsing conveyor belt 409 and the flushing conveyor belt 502 are all driven to rotate by the conveyor belt motor 108 controlled by the controller 102, so as to realize the conveyance of the PET bottle flakes.

[0050] Specifically, the first feeding blower 207 uses wind power to send the PET bottle flakes that fall into the unpacking feeding trough 206 into the floating washing tank 302 with built-in salt water (NaCl solution). After being horizontally stirred by the stirring device and allowed to stand, the impurities on the PET bottle flakes are initially washed off. After standing, the PET bottle flakes in the middle and upper layers are salvaged by the inclined floating washing conveyor belt 309 and sent to the rinsing feeding trough 410. Due to the diffusion effect, the rinsed PET will be continuously brought out of the liquid surface by the floating washing conveyor belt 309 and sent to the rinsing feeding trough 410. After the floating washing tank 302 has been running for a period of time, the impurities accumulated in the lower layer are sent to the floating washing filter water box 308 outside the floating washing tank 302 through the start of the pumping pump 310 after the pumping valve 306 is opened, and the impurities are filtered out by the filter element in the box, and the NaCl solution after filtering out the impurities is flowed into the floating washing tank 302 through the floating washing liquid circulating water pipe 307 through the pumping pump 310 for recycling. When the impurities filtered in the float filter water box 308 accumulate to a certain extent, the impurities are cleaned through the impurity cleaning window 311.

[0051] The second feeding blower 312 blows the PET bottle flakes dropped into the rinsing feed slot 410 into the rinsing tank 402. The high temperature alkaline water in the rinsing tank 402 drives the PET bottle flakes to be rinsed in the rinsing tank 402. The high temperature alkaline water after rinsing is filtered by the rinsing filter water box 403 and the rinsing circulation booster pump 405 through the rinsing circulation water pipe 404. The filter element in the rinsing filter water box 403 filters out impurities such as glue in the alkaline water, so that the alkaline water can be recycled. On one side of the outlet of the rinsing tank 402, the PET bottle flakes are salvaged and sent to the flushing feed chute 509 via the inclined rinsing conveyor belt 409 and fall onto the net conveyor belt of the flushing device 501. The rinsing filter water box 403 is provided with an impurity cleaning window 311 and a water injection valve for injecting and replenishing the rinsing alkaline water solution. The cleaning and water replenishment operations can be performed by opening the housing 101. A rinsing liquid level sensor 407 is installed on the inner wall of the hot water rinsing tank 402. When the level of the rinsing liquid drops to a certain level, the controller 102 will remind the operator to replenish the prepared rinsing solution.

[0052] Heater arranged at the bottom of the rinsing tank 402 The rinsing heater 411 at the bottom of the rinsing tank 402 can heat the PET bottle flakes and alkaline water to 80°C to 90°C. The rinsing solution in the rinsing tank 402 is high-temperature alkaline water. After removing impurities, the high-temperature alkaline water is pressurized by the rinsing circulation booster pump 405 and sent back to the inlet 103 of the rinsing tank 402. The flow of the high-temperature alkaline water in the rinsing tank drives the PET bottle flakes at the inlet 103 to be rinsed. At the discharge port 104 in the rinsing device 401, the rinsing conveyor belt 409 with holes placed at a certain angle can separate the PET bottle flakes and the high-temperature alkaline water during the conveying process. The inclination angle of the rinsing conveyor belt 409 is 25 degrees to 60 degrees. A liquid level detection sensor is installed on the inner wall of the rinsing tank 402 in the rinsing device 401. When the liquid level drops to a certain standard, the controller 102 reminds the operator to add the prepared alkaline water. In addition, a pH value detection sensor is installed on the inner wall of the rinsing tank 402 in the rinsing device 401. When the pH value drops to a certain standard, the controller 102 reminds the operator to add a high concentration of alkali solution. A thermal insulation material layer is installed on one side of the outer wall of the rinsing tank 402.

[0053] The rinse conveyor 409 conveys the rinsed PET bottle flakes to the end, where they are blown off by the third feeding blower 506, and then fall onto the screen-type rinse conveyor 502 after being blocked by the rinse feed chute 509. When the rinse conveyor 502 is running, the baffle 507 installed at the bottom of the corresponding end of the hot water spray pipe 503 makes the PET bottle flakes evenly spread on the conveying surface of the perforated screen-type rinse conveyor 502. When passing through the area rinsed by the high-pressure nozzle 508, the high-pressure nozzle 508 above the rinse conveyor 502 uses hot water to rinse and clean the PET bottle flakes on the conveyor during the part of the journey where the rinse conveyor 502 conveys the PET bottle flakes, so as to rinse off the alkaline aqueous solution on the surface of the PET and impurities such as glue that have not been separated. The distance between the high-pressure nozzle 508 in the rinse device 501 and the rinse conveyor 502 is 4 cm to 20 cm. The high-pressure nozzle 508 is a shower-type nozzle, and the number of the high-pressure nozzles 508 can be adjusted according to the number of PET bottle flakes to be processed at one time. The hot water after flushing flows through the filter surface of the flushing conveyor belt 502 into the water reservoir 504 at the bottom, and is filtered, pressurized and heated by the flushing heating and pressurizing device, and the water temperature is kept within the temperature range of 80℃ to 90℃ before being sent to the high-pressure nozzle 508 to flush the PET bottle flakes and recycle them. The heating device includes a heater 513 arranged at the bottom of the water reservoir 504, and the heater 513 is connected to a heating pipe 514 fixed to the bottom of the water reservoir 504; a temperature sensor is arranged in the water reservoir 504, and the water reservoir temperature is adjusted to 80℃ to 90℃ through the heater 513 at the bottom of the water reservoir 504. There is an impurity cleaning window 311 and a water injection valve for injecting and replenishing water on the flushing and filtering water tank 511. The cleaning and replenishing operations can be performed by opening the housing 101. The water reservoir 504 is provided with a water temperature sensor 515 and a water level sensor 516 electrically connected to the controller 102. When the liquid level in the water reservoir is lower than a certain standard, the controller 102 will remind the operator to add clean water. The outer wall of the water reservoir 504 is equipped with a thermal insulation material layer (not shown).

[0054] After leaving the washing area of ​​the high-pressure nozzle 508, the washed PET bottle flakes continue to be conveyed on the surface of the screen-type washing conveyor belt 502. After a short period of natural drainage during the conveying process, the washed PET bottle flakes are blown by the wind of the fourth feeding blower 604 to pass through the drying feed trough 603 of the drying bin 602. At the same time, in order to increase the drainage effect, a vibration device can be installed on the washing conveyor belt 502 to remove excess water on the surface of the PET bottle flakes and accelerate the drainage.

[0055] The PET bottle flakes fed into the drying bin 602 are detected by the drying humidity sensor 612 provided on the inner wall of the drying bin 602 at a temperature of 120°C to 150°C, and the drying time of the drying heater 606 is automatically set. In this embodiment, the preferred drying temperature range is 60°C to 80°C. When the humidity is less than 0.03%, the drying heater 606 stops heating and drying, and the discharge valve 605 at the bottom of the drying bin 602 is opened. The dried PET bottle flakes fall into the discharge port 104 on the housing 101 for standby use, and after the undried PET bottle flakes are fed into the drying bin 602, this process is repeated. Preferably, in order to speed up the speed at which the dried PET bottle flakes fall into the discharge port 104 on the housing 101, a fifth feeding blower (not shown) can be added in the drying bin 602 to blow air in the direction of the discharge valve 605. A feed valve (not shown) connected to the drying feed trough 603 is provided at the entrance of the top of the drying bin 602, and a quantity sensor 613 for detecting the number of PET bottle flakes is provided on the inner wall of the entrance of the top of the drying bin 602. When the number of PET bottle flakes in the drying bin 602 reaches a certain standard, the feed valve is closed, and the unpacking device 201, the floating washing device 301, the rinsing device 401 and the flushing device 501 all stop working temporarily. When the drying work of the drying bin 602 is completed, the unpacking device 201, the floating washing device 301, the rinsing device 401 and the flushing device 501 all start working normally.

[0056] Depend on Figure 7 As shown, the second embodiment of the present invention, in the second embodiment, a rotary serpentine rinsing channel is provided on one side of the rinsing tank 402 adjacent to the rinsing feed trough 410, and a rinsing conveyor belt is provided on the other side of the rinsing tank. The labyrinth-shaped rotary serpentine rinsing water tank can form a flow cycle of the high-temperature alkaline water washing liquid in the rinsing tank 402 through the rinsing circulation booster pump 405 and the rinsing circulation water pipe 404 of the rinsing tank 402, so that the PET bottle flakes form a long rotary reciprocating rinsing process in the high-temperature alkaline water of the rinsing tank 402, and a high-speed water flow is formed through the rotary serpentine reciprocating water flow channel. The impact of the high-speed water flow enables the PET bottle flakes to be rinsed more fully and efficiently. The screen-type rinsing conveyor belt 409 can pick up the floating PET bottle flakes by the flow direction of the water circulation and convey them to slide onto the washing conveyor belt 502 to enter the next link. It should be noted that all conveyor belts in the present invention are driven by conveyor belt motors 108 , and all components are fixed in the housing via fixing brackets 109 .

[0057] Specifically, the present invention provides a PET bottle flake washing machine, which has an integrated full-automatic design, a simple process, convenient manual operation, water saving, low noise, small footprint, and high-quality PET bottle flakes. Therefore, the production cleaning time is saved, environmental pollution is reduced, noise pollution is reduced, production costs are saved, and cleaning efficiency is improved. In addition, the cleaning effect of the PET bottle flakes in the overall cleaning process is good, and high-quality PET bottle flakes can be obtained by one-time cleaning, which saves energy. The bottle flakes are washed with circulating water throughout the process, which reduces environmental pollution. In addition, a sound insulation device is set outside the device to effectively reduce noise pollution. The operator only needs to regularly add the solution consumed by floating washing, rinsing and flushing, which is fully automated and saves labor. Moreover, the relevant equipment of the overall process is easy to install, occupies a small area, and saves costs. And the sorted PET bottle flakes can be packaged or bagged by sorting and sorting equipment such as a color sorter, and different types of bottle flakes enter different tracks for packaging and can be used for a variety of other specific purposes, with high resource utilization. Therefore, it has good economic benefits and market prospects and is suitable for promotion and application.

[0058] It should be emphasized that the above are only preferred embodiments of the present invention and do not limit the present invention in any form. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A PET bottle flake washing machine, characterized in that: It includes an external shell and an unpacking device, a floating washing device, a rinsing device, a flushing device, a drying device and a control device arranged inside the shell; the control device includes a controller arranged on the outside of the top of the shell, and the unpacking device, the floating washing device, the rinsing device and the drying device are electrically connected to the controller respectively; the rinsing device is arranged on one side of the floating washing device, the flushing device is arranged at the bottom of the rinsing device, and the drying device is arranged on one side of the flushing device; an inlet is provided on one side of the top of the shell, and an outlet is provided on one side of the bottom of the shell; the unpacking device includes an unpacking conveyor belt and an unpacking machine; the floating washing device includes a floating washing tank arranged below the unpacking conveyor belt The flotation tank is provided with a stirring device, a flotation liquid circulation filtering device, a flotation liquid level sensor and a flotation conveyor belt; the rinsing device includes a rinsing tank, a rinsing filter tank, a rinsing circulation water pipe, a rinsing circulation booster pump, a temperature control device, a rinsing liquid level sensor, a pH value sensor and a rinsing conveyor belt; the flushing device includes a flushing conveyor belt, a hot water nozzle and a flushing heating and pressurizing device, and the flushing heating and pressurizing device includes a water storage tank, a heating device, and a flushing circulation device; the drying device includes a drying bin; the controller is provided with an alarm; an insulation layer and a sound insulation layer are provided on the outside of the shell; the unpacking conveyor belt, the flotation conveyor belt, the rinsing conveyor belt and the flushing conveyor belt are all driven and transmitted by a conveyor belt motor.

2. A PET bottle flake washing machine according to claim 1, characterized in that; One end of the unpacking conveyor belt extends out of the feed port for placing the bottle flake packages to be cleaned, and the unpacking machine is arranged above the unpacking conveyor belt for unpacking the bottle flake packages and pouring the PET bottle flakes in the bottle flake packages into the unpacking conveyor belt.

3. A PET bottle flake washing machine according to claim 1, characterized in that: The flotation tank is filled with flotation liquid; an unpacking feeding trough is provided between the flotation tank and the unpacking conveyor belt, an inlet end of the unpacking feeding trough is arranged at the bottom of one end of the unpacking conveyor belt, and an outlet end of the unpacking feeding trough is arranged at the top of the flotation tank; a first feeding blower is arranged above the inlet end of the unpacking feeding trough; the stirring device comprises a stirring motor and a stirring fan blade arranged on one side of the flotation tank; the flotation liquid circulation and filtering device comprises a pumping valve, a flotation liquid circulation water pipe and a flotation filter water tank, the pumping valve is arranged at the bottom of the flotation tank and is connected to the top water inlet of the flotation filter water tank through a pipeline, the bottom water outlet of the flotation filter water tank is connected to the bottom end of the flotation liquid circulation water pipe, and the top end of the flotation liquid circulation water pipe extends to the top of the flotation tank; a pumping pump is provided on the flotation liquid circulation water pipe; the flotation filter water tank is provided with an impurity filtering layer and an impurity cleaning window.

4. A PET bottle flake washing machine according to claim 1, characterized in that: A rinsing feed trough is provided below one side of the rinsing tank adjacent to the floating conveyor belt, the rinsing conveyor belt is arranged on the other side of the rinsing tank, and a second feeding blower is provided above the rinsing feed trough; the temperature control device includes a rinsing heater arranged at the bottom of the rinsing tank; the two ends of the rinsing circulation water pipe are respectively connected to the two ends of the rinsing tank, the rinsing filter water box and the rinsing circulation booster pump are respectively arranged in the rinsing circulation water pipe, and a rinsing filter layer is provided in the rinsing filter water box; the rinsing liquid level sensor and the pH value sensor are arranged on the inner wall of the rinsing tank and are electrically connected to the controller respectively; alkaline water rinsing liquid is provided in the rinsing tank, one end of the rinsing conveyor belt is arranged below the liquid level of the alkaline water rinsing liquid, the other end of the rinsing conveyor belt extends to the outside of the other side edge of the rinsing tank, and a third feeding blower is provided above it.

5. The PET bottle flakes washing machine according to claim 1, characterized in that: The flushing conveyor belt is horizontally arranged above the water reservoir, the hot water nozzle is horizontally arranged above the flushing conveyor belt, a baffle is downwardly provided at the end of the hot water nozzle, and a high-pressure nozzle is downwardly provided at the bottom of the hot water nozzle; one side of the flushing conveyor belt is upwardly provided with a flushing feed chute extending to one side of the rinsing device; the flushing circulation device includes a flushing booster water pump, a flushing filter water tank and a flushing filter circulating water pipe arranged at the bottom of the water reservoir, the flushing booster water pump and the flushing filter water tank are connected to the water reservoir through one end of the flushing filter circulating water pipe, and the other end of the flushing filter circulating water pipe extends upward to be connected with the hot water nozzle; one end of the flushing conveyor belt extends to above the drying device; the heating device includes a heater arranged at the bottom of the water reservoir, and the heater is connected to a heating pipe fixed at the bottom of the water reservoir; a water storage temperature sensor and a water storage liquid level sensor are provided in the water reservoir.

6. A PET bottle flake washing machine according to claim 1, characterized in that: A drying feed trough extending to the corresponding end of the flushing conveyor belt is provided on the top of the drying bin, and a fourth feeding blower is provided above the drying feed trough; a discharge valve is provided at the bottom of the drying bin, and the discharge valve is communicated with the discharge port on the shell; a drying heating device and a temperature and humidity detection device are provided in the drying bin, and the drying heating device includes a drying heater and a cooling fan, and a protective filter bracket is provided on the outside of the drying heating device to separate the drying heating device from the PET bottle flakes; a breathable filter hole is provided on the top of the drying bin; the drying heater includes a heating tube arranged around the inner wall of the drying bin; the temperature and humidity detection device includes a drying temperature sensor and a drying humidity sensor, and a quantity sensor is provided on the inner wall of the drying bin.

7. A PET bottle flake washing machine according to claim 4, characterized in that: A rotary serpentine rinsing channel is provided on one side of the rinsing tank adjacent to the rinsing feeding trough, and the rinsing conveyor belt is arranged on the other side of the rinsing tank.

8. The PET bottle flake washing machine according to claim 3, characterized in that: The flotation liquid comprises a NaCl solution with a density of 1.1-1.2; the flotation conveyor belt is an inclined conveyor belt, one end of which is immersed below the liquid surface of the flotation liquid and the other end extends to the outside of the edge of the flotation tank; the inclination angle of the flotation conveyor belt is 15° to 45°.

9. A PET bottle flake washing machine according to claim 4, characterized in that: The inclination angle of the rinsing conveyor belt is 25° to 60°; the temperature of the alkaline water rinsing liquid is 80° C. to 90° C.

10. The PET bottle flakes washing machine according to claim 5, characterized in that: The water temperature of the water reservoir is 80°-90°.

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