An environmental protection pre - processing device and processing method for plastic products

Abstract

This application relates to the technical field of environmental protection recycling of plastic products, and specifically discloses a pre-processing device and processing method for environmental protection recycling of plastic products, which includes a machine body. A lid-removing conveyor belt is arranged on the machine body. A pressing plate is arranged above the lid-removing conveyor belt near its outlet in a lifting manner on the machine body. One end of the machine body at the outlet of the lid-removing conveyor belt is provided with a lid-removing sleeve. A lid-removing strip is arranged in the lid-removing sleeve. A winding wheel is also rotatably connected in the lid-removing sleeve. A limiting plug is arranged on the side of the lid-removing strip away from the lid-removing conveyor belt in the lid-removing sleeve; A hydraulic cylinder for moving the lid-removing sleeve is fixedly connected to the machine body. A motor is also fixedly connected to the machine body. A lid-removing assembly for pushing the bottle cap out of the lid-removing sleeve is arranged in the lid-removing sleeve. A restoring member for restoring the lid-removing strip to its initial expanded state is also arranged in the lid-removing sleeve. A lifting member for driving the pressing plate to lift is arranged on the machine body. This application has the effect of reducing the labor cost when the bottle cap is separated from the bottle body.

Description

Technical Field

[0001] This application relates to the technical field of environmental protection recycling of plastic products, and in particular to a pre-processing device and processing method for environmental protection recycling of plastic products. Background Art

[0002] Plastic products are a general term for daily necessities, industrial products, etc. processed mainly with plastics, including products of all processes such as injection molding and thermoforming with plastics as raw materials. Plastic is a type of synthetic polymer material with plasticity.

[0003] Plastic beverage bottles are common recyclable plastic products. Their bottle bodies are mainly made of PET and PP materials, and their bottle caps are mainly made of PP, PE, and HDPE materials. Before recycling and processing plastic bottles, it is necessary to remove labels (remove the label paper wrapped on the surface of the bottle body), crush and wash, sort the shredded materials, and melt and extrude. When recycling plastic bottles, the price of recycling the whole plastic bottle is relatively lower than that of recycling the bottle body alone. At the same time, there is still some market demand for recycling complete bottle caps alone.

[0004] Regarding the above related technologies, the inventor believes that there are the following defects: when separating the bottle body and the bottle cap, it is usually necessary to manually unscrew the bottle cap from the bottle body, resulting in high labor costs and low efficiency. Summary of the Invention

[0005] In order to improve the problem of high labor costs for separating the bottle cap and the bottle body, this application provides a pre-processing device and processing method for environmental protection recycling of plastic products.

[0006] A pre-processing device for environmental protection recycling of plastic products provided by this application adopts the following technical solutions:

[0007] A pre-processing device for environmental protection recycling of plastic products includes a machine body, characterized in that: a de-capping conveyor belt with a sunken surface is arranged on the machine body; a pressing plate is arranged above the de-capping conveyor belt near its outlet in a lifting manner on the machine body; a de-capping sleeve is arranged at one end of the outlet of the de-capping conveyor belt on the machine body; a de-capping strip is arranged in the de-capping sleeve; a powered winding wheel is also rotatably connected in the de-capping sleeve; one end of the de-capping strip is fixedly connected to the inner wall of the de-capping sleeve, and the other end is wound around the circumferential wall of the winding wheel; a limiting plug is arranged on the side of the de-capping strip away from the de-capping conveyor belt in the de-capping sleeve;

[0008] A hydraulic cylinder for moving the decapping sleeve is fixedly connected to the machine body, a motor is also fixedly connected to the machine body, the hydraulic cylinder is fixedly connected to the output shaft of the motor, a decapping assembly for withdrawing the bottle cap from the decapping sleeve is arranged in the decapping sleeve, a restoring member for restoring the decapping strip to its initial expanded state is also arranged in the decapping sleeve, and a lifting member for driving the pressing plate to rise and fall is arranged on the machine body.

[0009] By adopting the above technical scheme, the plastic bottle is placed on the decapping conveyor belt with the bottle cap facing the decapping sleeve, and the plastic bottle is continuously conveyed by the decapping conveyor belt until the bottle cap is inserted into the decapping sleeve. At this time, the bottle cap presses against the limit plug and the bottle body cannot move forward. Then the winding wheel is driven to tighten the decapping strip until the decapping strip clamps the bottle cap. At the same time, the lifting member drives the pressing plate to press down so that the bottle body is fixed by the pressing plate and the decapping conveyor belt. Then the motor is turned on to rotate the decapping sleeve in the decapping direction. At this time, the bottle body is fixed and the bottle cap is driven to rotate by the decapping strip. During this process, the hydraulic cylinder synchronously pulls the decapping sleeve to move away from the bottle body to facilitate the removal of the bottle cap; when the bottle cap falls off, it rotates around the reel, causing the decapping strip to be gradually expanded to its original state by the restoration part, and then the cap-removing assembly pushes the bottle cap away from the decapping sleeve, and then the pressure plate rises, and the bottle body continues to move forward until it falls from the decapping conveyor belt, and finally the hydraulic cylinder pushes the decapping sleeve to reset. This process is mostly a process-based operation, which requires less manual operation and is more efficient, and the decapping method of the decapping strip is easy to adapt to bottle caps of various types and sizes.

[0010] Optionally, a fixed sleeve mounted on the cover-removing sleeve is fixedly connected to the machine body, a tension spring is fixedly connected to the bottom of the cover-removing sleeve, one end of the tension spring away from the cover-removing sleeve is fixedly connected to the fixed sleeve, a displacement sensor is fixedly connected to the fixed sleeve, a detection end of the displacement sensor is fixedly connected to the cover-removing sleeve, and the displacement sensor is electrically connected to the hydraulic cylinder, the motor and the winding wheel, respectively.

[0011] By adopting the above technical solution, when the cap removing sleeve rotates and the hydraulic cylinder contracts, the tension spring is lengthened and the displacement distance of the cap removing sleeve is smaller than that of the fixed sleeve, so as to avoid the damage of the bottle cap due to excessive pulling force of the hydraulic cylinder. When the bottle cap is separated from the bottle body, the cap removing sleeve moves toward the fixed sleeve due to the action of the tension spring. At this time, the data of the displacement sensor decreases rapidly, indicating that the bottle cap has been separated from the bottle body. At this time, the displacement sensor controls the unwinding of the winding wheel, stops the motor from operating, and pushes back the hydraulic cylinder.

[0012] Optionally, the cap-removing assembly includes a limiting ring elastically and slidably connected within the cap-removing sleeve, a connecting rod fixedly connected between the limiting ring and the limiting plug, an elastic valve sheet fixedly connected to the peripheral wall of the limiting plug, and an exhaust probe fixedly connected within the cap-removing sleeve. The valve sheet is located on the side of the limiting ring away from the cap-removing strip. When the limiting ring is in a free state, the limiting plug is located on the side of the cap-removing strip away from the cap-removing conveyor belt, and the exhaust probe does not abut against the valve sheet. When the limiting plug enters the cap-removing strip, the exhaust probe abuts against the valve sheet.

[0013] By adopting the above technical solution, when the hydraulic cylinder contracts, the moving stroke of the cap-removing sleeve is smaller than the moving stroke of the fixed sleeve, that is, the cap-removing sleeve and the fixed sleeve are in an elongation process. At this time, since the space between the fixed sleeve and the valve sheet increases and the pressure decreases, the external air pushes open the valve sheet and enters the fixed sleeve. When the bottle cap is separated from the bottle body, the cap-removing sleeve is rapidly moved towards the fixed sleeve under the pulling force of the tension spring. At this time, the air in the fixed sleeve is compressed, so that the limiting ring is pressured and moved towards the direction close to the bottle cap, that is, the limiting plug moves towards the direction close to the bottle cap until the limiting plug presses the bottle cap tightly. When the winding wheel unwinds, the limiting plug pushes the bottle cap out to prevent the bottle cap from being tightly clamped by the cap-removing strip and sticking to the cap-removing strip and unable to fall off by itself. As the limiting plug enters the cap-removing strip, the exhaust probe presses the valve sheet, making the valve sheet unable to seal the gap between the limiting ring and the limiting plug, so as to facilitate the discharge of the high-pressure gas in the fixed sleeve. When the air pressure in the fixed sleeve decreases, the limiting ring is bounced back to the initial position, facilitating the subsequent cap-removing operation of the plastic bottle.

[0014] Optionally, an electromagnet is fixedly connected to the outer wall of the cap-removing sleeve. The limiting ring has magnetism. The electromagnet is located at the free end of the limiting ring close to the cap-removing sleeve, and the exhaust probe is electrically connected to the electromagnet.

[0015] By adopting the above technical solution, when the cap-removing is completed and the exhaust probe does not detect that it is in contact with the valve sheet, at this time, the electromagnet is energized to generate a magnetic force that attracts the limiting ring, so that the limiting ring moves towards the direction close to the electromagnet, that is, the limiting plug moves towards the bottle cap, further ensuring the smooth detachment of the bottle cap from the cap-removing strip and also ensuring the smooth exhaust of the fixed sleeve.

[0016] Optionally, the machine body is fixedly connected with a double-axis moving platform on both sides of the bottle body. The output end of the double-axis moving platform is rotationally connected with a power pressure roller. The moving directions of the double-axis moving platform are respectively parallel to the length direction of the cap-removing sleeve and perpendicular to the length direction of the cap-removing sleeve along the horizontal plane. A visual sensor electrically connected to the double-axis moving platform is fixedly connected to the machine body. Collection frames are placed below both of the power pressure rollers on the machine body, and a collection frame is also placed below the end of the cap-removing sleeve close to the bottle body. A guide plate for guiding the separated objects into the collection frame is fixedly connected in the collection frame.

[0017] By adopting the above technical solution, after the cap-removing process is completed, since the PET material has high transparency and good gloss, while the PP material is mostly semi-transparent or opaque, at this time, the color of the bottle body is observed through the visual sensor to judge the material of the bottle body. Then, the visual sensor controls the double-axis moving platform to move, so that the two power pressure rollers clamp and squeeze the bottle body to make the bottle body into a flat shape convenient for collection. At the same time, the visual sensor controls the positions of the two power pressure rollers relative to the cap-removing conveyor belt respectively to control the bending direction of the bottle body after being flattened. With the guiding function of the guide plate, it is convenient for the bottle bodies of the same material to fall into the same corresponding collection frame, further omitting the sorting step in the subsequent processing of the bottle body.

[0018] Optionally, a heating rod is elastically arranged on the pressing plate, and the height of the heating rod is lower than the height of the pressing plate.

[0019] By adopting the above technical solution, after the bottle body is conveyed below the pressing plate, the pressing plate descends, causing the heating rod to also descend. When the pressing plate squeezes the bottle body, the heating rod also squeezes the bottle body, and the heating rod is heated to 70 - 100 °C. Then, the visual sensor synchronously monitors the position of the bottle body below the heating rod. Since the heat resistance of the PET material generally does not exceed 70 °C and it is prone to deformation at high temperatures, while the PP material can withstand temperatures above 100 °C, and is not easily deformed and has high impact resistance at high temperatures. If the bottle body is penetrated at this time, it indicates that the bottle body is made of PET material. If the bottle body is not even softened or penetrated, it indicates that the bottle body is made of PP material, thereby improving the accuracy of subsequent material separation by the power pressure rollers.

[0020] Optionally, an air nozzle inclined downward and directly below the outlet of the cap-removing sleeve is fixedly connected to the machine body above the bottle body.

[0021] By adopting the above technical solution, when the cap is separated from the bottle body, the air nozzle is opened to spray air. When the limit plug pushes out the cap, the airflow sprayed by the air nozzle acts on the cap, causing the cap to move towards the collection frame located below the outlet of the cap-removing sleeve, avoiding the cap entering other collection frames due to inertia after being separated from the cap-removing sleeve.

[0022] Optionally, the lifting members are a plurality of electric push rods fixedly connected to the body and arranged on both sides of the bottle body. The pressing plate is made of a ductile material, and friction pads are fixedly connected to the surface of the lid-removing conveyor belt and the bottom of the pressing plate.

[0023] By adopting the above technical solution, when the electric push rod pushes the pressing plate downward, since the pressing plate is ductile, the pressing plate bends, thereby increasing the contact area between the pressing plate and the bottle body. At the same time, the friction pads effectively increase the friction force between it and the bottle body, thereby effectively improving the stability of the bottle body during the lid-removing process.

[0024] Optionally, the restoring members are a plurality of elastic ropes fixedly connected to the inner wall of the lid-removing sleeve in an annular distribution, and the free ends of the elastic ropes are fixedly connected to the lid-removing strips.

[0025] By adopting the above technical solution, after the lid is removed, the winding wheel unwinds. During this process, the elastic ropes pull the lid-removing strips, causing the lid-removing strips to gradually expand, so as to facilitate the subsequent caps to enter the lid-removing strips.

[0026] A pre-processing method for environmental protection recycling of plastic products includes the following steps:

[0027] S1. Feeding and fixing: Place the plastic bottle on the lid-removing conveyor belt with the cap facing the lid-removing sleeve, and continuously convey the plastic bottle by the lid-removing conveyor belt until the cap is inserted into the lid-removing sleeve. The pressing plate presses down to fix the bottle body between the lid-removing conveyor belt and the pressing plate, and the winding wheel winds up to fix the cap with the lid-removing strip.

[0028] S2. Detection and lid removal: Turn on the heating rod, and the visual sensor monitors the bottle body in real time to detect the material of the bottle body. Turn on the motor, and the lid-removing sleeve rotates, causing the lid-removing strip and the fixed cap to rotate accordingly. At the same time, the lid-removing sleeve moves away from the bottle body until the cap is separated from the bottle body.

[0029] S3. Material separation: The limiting plug pushes the cap, and at the same time the lid-removing strip releases the cap, so that the cap is pushed out of the lid-removing sleeve. Then the air nozzle blows the cap into the corresponding collection box. At the same time, the visual sensor controls the movement of the double-axis moving table, so that the two power rollers clamp and squeeze the bottle body, and with the guiding function of the guiding plate, the bottle body also falls into the corresponding collection box.

[0030] In summary, the present application includes at least one of the following beneficial technical effects:

[0031] 1. Drive the winding wheel to tighten the capping strip until the capping strip tightens the bottle cap. At the same time, the lifting part drives the pressing plate to press down so that the bottle body is fixed by the pressing plate and the capping conveyor belt. Then, turn on the motor to rotate the capping sleeve in the capping direction. During this process, the hydraulic cylinder synchronously pulls the capping sleeve to move away from the bottle body to facilitate the cap falling off. When the bottle cap falls off, the winding wheel rotates so that the capping strip is gradually expanded to its original state by the restoring part. Then, the capping assembly pushes the bottle cap away from the capping sleeve. Then, the pressing plate rises, and the bottle body continues to move forward until it falls from the capping conveyor belt. Finally, the hydraulic cylinder pushes the capping sleeve to reset. This process is mostly a process-based operation, which requires less manual operation and is more efficient. In addition, the capping method of the capping strip is easy to adapt to various types and sizes of bottle caps.

[0032] 2. When the stripping sleeve rotates and the hydraulic cylinder contracts, the tension spring stretches and the displacement distance of the stripping sleeve is smaller than that of the fixed sleeve, so as to avoid the hydraulic cylinder from damaging the bottle cap due to excessive tension. When the bottle cap is separated from the bottle body, the stripping sleeve moves towards the fixed sleeve due to the action of the tension spring. At this time, the data of the displacement sensor decreases rapidly, indicating that the bottle cap has been separated from the bottle body. At this time, the displacement sensor controls the winding wheel to unwind, the motor stops working, and the hydraulic cylinder pushes back;

[0033] 3. When the capping is finished and the exhaust probe does not detect that it is in contact with the valve plate, the electromagnet is energized to generate a magnetic force that attracts the limit ring, causing the limit ring to move toward the electromagnet, that is, the limit plug moves toward the bottle cap, further ensuring that the bottle cap falls off the capping strip smoothly, while also ensuring the smooth exhaust of the fixed sleeve;

[0034] 4. After the bottle body is conveyed to the bottom of the pressing plate, the pressing plate descends. When the pressing plate squeezes the bottle body, the heating rod also squeezes the bottle body, and the heating rod is heated to 70-100℃. Then the visual sensor synchronously monitors the state of the bottle body under the heating rod. If the bottle body is pierced at this time, it means that the bottle body is made of PET material. If the bottle body is not softened or even pierced, it means that the bottle body is made of PP material. At the same time, when the decapping process is completed, since PET material has high transparency and good gloss, PP material is mostly translucent or opaque. At this time, the color of the bottle body is observed by the visual sensor. The two methods cooperate with each other, so that the visual sensor can effectively and accurately judge the material of the bottle body. Then, the visual sensor controls the position of the two power pressing rollers from the decapping conveyor belt respectively to control the bending direction of the bottle body after being flattened. With the guiding effect of the guide plate, it is convenient for bottles of the same material to fall into the same corresponding collection frame, further omitting the sorting step during the subsequent processing of the bottle body. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application;

[0036] Figure 2It is a partial structural schematic diagram after hiding the double-axis moving table and the power pressure roller on one side in the embodiment of the present application;

[0037] Figure 3 It is a partial sectional structural schematic diagram mainly used to show the de-capping sleeve, its interior and surface, and the interior of the fixed sleeve in the embodiment of the present application.

[0038] Reference numerals: 1, body; 11, de-capping conveyor belt; 12, pressing plate; 13, electric push rod; 2, de-capping sleeve; 21, de-capping strip; 22, winding wheel; 23, limit plug; 24, electromagnet; 25, elastic pull rope; 31, hydraulic cylinder; 32, motor; 4, cap-removing assembly; 41, limit ring; 42, connecting rod; 43, valve plate; 44, exhaust probe; 51, fixed sleeve; 52, tension spring; 53, displacement sensor; 61, double-axis moving table; 62, power pressure roller; 63, vision sensor; 64, heating rod; 71, collection box; 72, guide plate; 73, air nozzle; 81, bottle body; 82, bottle cap. Detailed implementation manners

[0039] The following will Figures 1-3 further describe the present application in detail.

[0040] Embodiment 1

[0041] The embodiment of the present application discloses an environmental protection recycling pre-processing device for plastic products. Referring to Figure 1 、 Figure 2 and Figure 3 , an environmental protection recycling pre-processing device for plastic products includes a body 1. A de-capping conveyor belt 11 with a sunken surface is arranged on the body 1. A pressing plate 12 is arranged above the de-capping conveyor belt 11 near its outlet in a lifting manner on the body 1. A de-capping sleeve 2 is arranged at one end of the outlet of the de-capping conveyor belt 11 on the body 1. A de-capping strip 21 is arranged in the de-capping sleeve 2. A power-driven winding wheel 22 is also rotatably connected in the de-capping sleeve 2. In the present application, the power of the winding wheel 22 is provided by a motor. One end of the de-capping strip 21 is fixedly connected to the inner wall of the de-capping sleeve 2, and the other end is wound around the circumferential wall of the winding wheel 22. A limit plug 23 is arranged on the side of the de-capping sleeve 2 away from the de-capping conveyor belt 11 where the de-capping strip 21 is located. A hydraulic cylinder 31 for moving the de-capping sleeve 2 is fixedly connected to the body 1. A motor 32 is also fixedly connected to the body 1. The output shaft of the hydraulic cylinder 31 is fixedly connected to the output shaft of the motor 32. A cap-removing assembly 4 for removing the bottle cap 82 from the de-capping sleeve 2 is arranged in the de-capping sleeve 2. A restoring member for restoring the de-capping strip 21 to its initial expanded state is also arranged in the de-capping sleeve 2. The restoring member is a plurality of elastic pull ropes 25 fixedly connected to the inner wall of the de-capping sleeve 2 in a circular distribution. The free ends of the elastic pull ropes 25 are fixedly connected to the de-capping strip 21. A lifting member for driving the pressing plate 12 to lift is also arranged on the body 1.

[0042] The plastic bottle is placed on the decapping conveyor belt 11 with the bottle cap 82 facing the decapping sleeve 2. The plastic bottle is continuously conveyed by the decapping conveyor belt 11 until the bottle cap 82 is inserted into the decapping sleeve 2. At this time, the bottle cap 82 presses against the limit stopper 23, so that the bottle body 81 cannot move forward. The winding wheel 22 is then driven to tighten the decapping strip 21 until the decapping strip 21 clamps the bottle cap 82. At the same time, the lifting member drives the pressing plate 12 to press down, so that the bottle body 81 is fixed by the pressing plate 12 and the decapping conveyor belt 11. The motor 32 is then turned on to rotate the decapping sleeve 2 in the decapping direction. At this time, the bottle body 81 is fixed and the bottle cap 82 is driven to rotate by the decapping strip 21. In this process, the hydraulic cylinder 31 synchronously pulls the decapping sleeve 2 away from the bottle body 81 The bottle body 81 moves forward to facilitate the falling off of the bottle cap 82; when the bottle cap 82 falls off, it rotates around the reel 22, so that the cap stripping strip 21 is pulled by the elastic pull rope 25 and gradually expands to its original state, and then the cap-removing component 4 pushes the bottle cap 82 away from the cap-removing sleeve 2, and then the pressing plate 12 rises, and the bottle body 81 continues to move forward until it falls from the cap-removing conveyor belt 11, and finally the hydraulic cylinder 31 pushes the cap-removing sleeve 2 to reset. This process is mostly a process-based operation, which requires less manual operation and has high efficiency. The cap-removing method of the cap stripping strip 21 is easy to adapt to various types and sizes of bottle caps 82. If multiple devices of the present application are combined with a bottle unscrambler (existing equipment) for feeding, the labor cost can be further reduced and the processing efficiency can be accelerated.

[0043] Reference Figure 2 and Figure 3 A fixed sleeve 51 is fixedly connected to the machine body 1 and is sleeved on the cover removing sleeve 2. A tension spring 52 is fixedly connected to the bottom of the cover removing sleeve 2. The end of the tension spring 52 away from the cover removing sleeve 2 is fixedly connected to the fixed sleeve 51. A displacement sensor 53 is fixedly connected to the fixed sleeve 51. The detection end of the displacement sensor 53 is fixedly connected to the cover removing sleeve 2. The displacement sensor 53 is electrically connected to the hydraulic cylinder 31, the motor 32 and the winding wheel 22 respectively. When the uncapping sleeve 2 rotates and the hydraulic cylinder 31 contracts, the tension spring 52 stretches and the displacement distance of the uncapping sleeve 2 is smaller than that of the fixed sleeve 51, so as to avoid the excessive tension of the hydraulic cylinder 31 from damaging the bottle cap 82. When the bottle cap 82 is separated from the bottle body 81, the tension spring 52 causes the uncapping sleeve 2 to move toward the fixed sleeve 51. At this time, the data of the displacement sensor 53 decreases rapidly, indicating that the bottle cap 82 has been separated from the bottle body 81. At this time, the displacement sensor 53 controls the unwinding of the winding wheel 22, stops the motor 32, and pushes back the hydraulic cylinder 31.

[0044] Reference Figure 1 and Figure 3, the lid-removing assembly 4 includes a limit ring 41 elastically and slidably connected within the lid-removing sleeve 2, a connecting rod 42 fixed between the limit ring 41 and the limit plug 23, an elastic valve sheet 43 fixed to the peripheral wall of the limit plug 23, and an exhaust probe 44 fixed within the lid-removing sleeve 2. In this application, a spring is connected between the limit ring 41 and the inner wall of the lid-removing sleeve 2. The valve sheet 43 is located on the side of the limit ring 41 away from the lid-removing strip 21. When the limit ring 41 is in a free state, the limit plug 23 is located on the side of the lid-removing strip 21 away from the lid-removing conveyor belt 11, and the exhaust probe 44 does not abut against the valve sheet 43. When the limit plug 23 enters the lid-removing strip 21, the exhaust probe 44 abuts against the valve sheet 43.

[0045] When the hydraulic cylinder 31 contracts, the moving stroke of the lid-removing sleeve 2 is less than the moving stroke of the fixed sleeve 51, that is, the lid-removing sleeve 2 and the fixed sleeve 51 are in an elongation process. At this time, due to the increase in the space and the decrease in pressure between the fixed sleeve 51 and the valve sheet 43, the external air pushes open the valve sheet 43 and enters the fixed sleeve 51. When the bottle cap 82 is separated from the bottle body 81, the lid-removing sleeve 2 is quickly moved towards the fixed sleeve 51 under the tension of the tension spring 52. At this time, the air in the fixed sleeve 51 is compressed, and then the limit ring 41 is pressured and moved towards the direction close to the bottle cap 82, that is, the limit plug 23 moves towards the direction close to the bottle cap 82 until the limit plug 23 presses tightly against the bottle cap 82. When the winding wheel 22 unwinds, the limit plug 23 ejects the bottle cap 82 to prevent the bottle cap 82 from being tightly clamped by the lid-removing strip 21 and sticking to the lid-removing strip 21 and unable to fall off by itself. As the limit plug 23 enters the lid-removing strip 21, the exhaust probe 44 pushes the valve sheet 43, making the valve sheet 43 unable to seal the gap between the limit ring 41 and the limit plug 23, so as to facilitate the discharge of the high-pressure gas in the fixed sleeve 51. When the air pressure in the fixed sleeve 51 decreases, the limit ring 41 is bounced back to the initial position, facilitating the subsequent lid-removing operation of the plastic bottle.

[0046] Refer to Figure 3 , an electromagnet 24 is fixed to the outer wall of the lid-removing sleeve 2. The limit ring 41 has magnetism. The electromagnet 24 is located at the free end of the limit ring 41 close to the lid-removing sleeve 2. The exhaust probe 44 is electrically connected to the electromagnet 24. When the lid-removing is completed and the exhaust probe 44 does not detect its contact with the valve sheet 43, at this time, the electromagnet 24 is energized to generate a magnetic force that attracts the limit ring 41, making the limit ring 41 move towards the direction close to the electromagnet 24, that is, the limit plug 23 moves towards the direction of the bottle cap 82, further ensuring the smooth detachment of the bottle cap 82 from the lid-removing strip 21 and also ensuring the smooth exhaust of the fixed sleeve 51.

[0047] Refer to Figure 2, on both sides of the bottle body 81, the machine body 1 is fixedly connected with a double-axis moving platform 61. The output end of the double-axis moving platform 61 is rotationally connected with a power pressure roller 62. The moving directions of the double-axis moving platform 61 are respectively parallel to the length direction of the cap-removing sleeve 2 and perpendicular to the length direction of the cap-removing sleeve 2 along the horizontal plane. The machine body 1 is fixedly connected with a visual sensor 63 electrically connected to the double-axis moving platform 61. Below both power pressure rollers 62 of the machine body 1, collection frames 71 are placed. Below the end of the cap-removing sleeve 2 close to the bottle body 81 of the machine body 1, a collection frame 71 is also placed. Inside the collection frame 71, a guide plate 72 for guiding the separated objects into the collection frame 71 is fixedly connected. On the pressing plate 12, a heating rod 64 is slidably connected through a spring, and the height of the heating rod 64 is lower than the height of the pressing plate 12.

[0048] After the bottle body 81 is conveyed below the pressing plate 12, the pressing plate 12 descends, causing the heating rod 64 to also descend. When the pressing plate 12 presses the bottle body 81, the heating rod 64 also presses the bottle body 81, and the heating rod 64 is heated to 70 - 100 °C, 80 °C in this application. Then the visual sensor 63 synchronously monitors the position of the bottle body 81 below the heating rod 64. Since the heat resistance of PET material generally does not exceed 70 °C and it is prone to deformation at high temperatures, while PP material can withstand temperatures above 100 °C, is not easily deformed at high temperatures, and has high impact resistance. If the bottle body 81 is pierced at this time, it indicates that the bottle body 81 is made of PET material. If the bottle body 81 is not softened or even pierced, it indicates that the bottle body 81 is made of PP material. At the same time, when the cap-removing process ends, since the PET material has high transparency and good gloss, while the PP material is mostly semi-transparent or opaque, at this time, the color of the bottle body 81 is observed through the visual sensor 63. The above two methods cooperate with each other, enabling the visual sensor 63 to effectively judge the material of the bottle body 81. Then the visual sensor 63 controls the double-axis moving platform 61 to move, causing the two power pressure rollers 62 to clamp and press the bottle body 81, making the bottle body 81 into a flattened shape convenient for collection. At the same time, the visual sensor 63 controls the positions of the two power pressure rollers 62 relative to the cap-removing conveyor belt 11 respectively to control the bending direction of the bottle body 81 after being flattened. With the guiding function of the guide plate 72, it is convenient for the bottle bodies 81 of the same material to all fall into the corresponding same collection frame 71, further omitting the sorting step in the subsequent processing of the bottle body 81.

[0049] Refer to Figure 2 , above the bottle body 81, the machine body 1 is fixedly connected with a nozzle 73 that inclines towards directly below the outlet of the cap-removing sleeve 2. When the bottle cap 82 is separated from the bottle body 81, the nozzle 73 is opened to spray air. When the limit plug 23 pushes out the bottle cap 82, the airflow ejected by the nozzle 73 acts on the bottle cap 82, causing the bottle cap 82 to move towards the collection frame 71 located below the outlet of the cap-removing sleeve 2, preventing the bottle cap 82 from entering other collection frames 71 due to inertia after being separated from the cap-removing sleeve 2.

[0050] Refer to Figure 2The lifting parts are multiple electric push rods 13 fixed to the machine body 1 and arranged on both sides of the bottle body 81. The pressing plate 12 is made of a tough material. The surface of the uncapping conveyor belt 11 and the bottom of the pressing plate 12 are both fixed with friction pads (not shown in the figure). When the electric push rods 13 push the pressing plate 12 downward, the pressing plate 12 is bent due to its toughness, thereby increasing the contact area between the pressing plate 12 and the bottle body 81. At the same time, the friction pad effectively increases the friction between it and the bottle body 81, thereby effectively improving the stability of the bottle body 81 during the uncapping process.

[0051] In other feasible embodiments, another collection frame 71 can be added to the machine body 1, so that the four collection frames 71 are placed in a "田" shape, the number of air nozzles 73 is increased to two and located on both sides above the bottle body 81, the two air nozzles 73 are tilted and aligned with the bottle caps 82, the air nozzles 73 are electrically connected to the visual sensor 63, and a number of refractors are installed on the machine body 1 so that the visual sensor 63 can also observe the bottle caps 82 through the refractors. When it is necessary to separate the prize-winning caps, when the visual sensor 63 detects that the current bottle cap 82 is a prize-winning cap, one of the air nozzles 73 blows the bottle cap 82 into one of the collection frames 71, and vice versa, when the visual sensor 63 detects that the bottle cap 82 is a non-prize-winning cap, the other air nozzle 73 blows the bottle cap 82 into another collection frame 71, so as to facilitate the automatic screening of prize-winning caps and non-prize-winning caps.

[0052] The implementation principle of the processing device and processing method for environmentally friendly recycling of plastic products in the embodiment of the present application is as follows: the plastic bottle is placed on the decapping conveyor belt 11 with the bottle cap 82 facing the decapping sleeve 2, and the plastic bottle is continuously conveyed by the decapping conveyor belt 11 until the bottle cap 82 is inserted into the decapping sleeve 2. At this time, the bottle cap 82 presses against the limit stopper 23, so that the bottle body 81 cannot move forward, and then the winding wheel 22 is driven to tighten the decapping strip 21 until the decapping strip 21 clamps the bottle cap 82, and at the same time, the electric push rod 13 drives the pressing plate 12 to press down, so that the bottle body 81 is fixed by the pressing plate 12 and the decapping conveyor belt 11, and at the same time, the heating rod 64 also squeezes the bottle body 81, and the heating rod 64 is heated to 70-100°C, and then the visual sensor 63 synchronously monitors the state of the bottle body 81 below the heating rod 64 to determine the material of the bottle body 81;

[0053] Then, the motor 32 is turned on to rotate the uncapping sleeve 2 in the uncapping direction. During this process, the hydraulic cylinder 31 synchronously pulls the uncapping sleeve 2 to move away from the bottle body 81, and the tension spring 52 is elongated to facilitate the removal of the bottle cap 82. The displacement distance of the uncapping sleeve 2 is smaller than that of the fixed sleeve 51, so as to avoid the bottle cap 82 being damaged by excessive tension of the hydraulic cylinder 31. During this process, the space between the fixed sleeve 51 and the valve plate 43 increases and the pressure decreases, so the external air pushes the valve plate 43 to enter the fixed sleeve 51;

[0054] After the bottle cap 82 is separated from the bottle body 81, the cap-removing sleeve 2 moves rapidly towards the fixed sleeve 51 under the pulling force of the tension spring 52. At this time, the air inside the fixed sleeve 51 is compressed, which causes the limit ring 41 to move towards the bottle cap 82 under pressure, that is, the limit plug 23 moves towards the bottle cap 82 until the limit plug 23 presses tightly against the bottle cap 82. At the same time, the winding wheel 22 rotates, causing the cap-removing strip 21 to be gradually expanded to its original state under the pulling of the elastic cord 25. At this time, the limit plug 23 pushes out the bottle cap 82 to prevent the bottle cap 82 from being tightened by the cap-removing strip 21 and sticking to the cap-removing strip 21 during the cap-removing process and unable to fall off by itself. As the limit plug 23 enters the cap-removing strip 21, the exhaust probe 44 pushes the valve plate 43, making the valve plate 43 unable to seal the gap between the limit ring 41 and the limit plug 23, so as to facilitate the discharge of the high-pressure gas inside the fixed sleeve 51. When the air pressure inside the fixed sleeve 51 decreases, the limit ring 41 is bounced back to its initial position;

[0055] After the bottle cap 82 on the bottle body 81 is separated, the visual sensor 63 controls the biaxial moving platform 61 to move, so that the two power pressure rollers 62 clamp and squeeze the bottle body 81. The bottle body 81 is bent under the extrusion of the power pressure rollers 62. With the guiding function of the guiding plate 72, it is convenient for the bottle bodies 81 of the same material to fall into the corresponding same collection box 71, further omitting the sorting steps during the subsequent processing of the bottle body 81.

[0056] Embodiment 2

[0057] The embodiment of the present application discloses a pre-processing method for environmental protection recycling of plastic products. Referring to Figure 1 、 Figure 2 and Figure 3 A pre-processing method for environmental protection recycling of plastic products includes the following steps:

[0058] S1. Feeding and fixing: Place the plastic bottle on the cap-removing conveyor belt 11 with the bottle cap 82 facing the cap-removing sleeve 2, so that the plastic bottle is continuously conveyed by the cap-removing conveyor belt 11 until the bottle cap 82 is inserted into the cap-removing sleeve 2. The pressing plate 12 presses down to fix the bottle body 81 between the cap-removing conveyor belt 11 and the pressing plate 12. The winding wheel 22 winds up, so that the bottle cap 82 is fixed by the cap-removing strip 21;

[0059] S2. Detection and cap removal: Turn on the heating rod 64 to make the visual sensor 63 monitor the bottle body 81 in real time to detect the material of the bottle body 81. Turn on the motor 32, and the cap-removing sleeve 2 rotates, causing the cap-removing strip 21 and the fixed bottle cap 82 to rotate accordingly. At the same time, the cap-removing sleeve 2 moves away from the bottle body 81 until the bottle cap 82 is separated from the bottle body 81;

[0060] S3. Material separation: The limit plug 23 pushes the bottle cap 82, and at the same time, the cap removal strip 21 releases the bottle cap 82, so that the bottle cap 82 is pushed out of the cap removal sleeve 2. Then, the air nozzle 73 blows the bottle cap 82 into the corresponding collection box 71. At the same time, the vision sensor 63 controls the movement of the two-axis moving table 61, so that the two power pressure rollers 62 clamp and squeeze the bottle body 81. With the guiding function of the guiding plate 72, the bottle body 81 also falls into the corresponding collection box 71.

[0061] The above are all the preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A plastic product environmentally friendly recycling pre-processing device, comprising a body (1), characterized in that: The machine body (1) is provided with a decapping conveyor belt (11) having a concave surface; the machine body (1) is provided with a pressing plate (12) above the decapping conveyor belt (11) near its outlet, and the machine body (1) is provided with a decapping sleeve (2) at one end of the outlet of the decapping conveyor belt (11); a decapping strip (21) is provided in the decapping sleeve (2); a powered winding wheel (22) is rotatably connected in the decapping sleeve (2); one end of the decapping strip (21) is fixedly connected to the inner wall of the decapping sleeve (2), and the other end is wound around the peripheral wall of the winding wheel (22); and a limiting stopper (23) is provided on the side of the decapping sleeve (2) away from the decapping conveyor belt (11); The machine body (1) is fixedly connected to a fixed sleeve (51) sleeved on the cover-removing sleeve (2); a tension spring (52) is fixedly connected to the bottom of the cover-removing sleeve (2); and one end of the tension spring (52) away from the cover-removing sleeve (2) is fixedly connected to the fixed sleeve (51); A hydraulic cylinder (31) for moving the cap-removing sleeve (2) is fixedly connected to the machine body (1), a motor (32) is also fixedly connected to the machine body (1), the hydraulic cylinder (31) is fixedly connected to the output shaft of the motor (32), a cap-removing assembly (4) for removing the bottle cap (82) from the cap-removing sleeve (2) is arranged in the cap-removing sleeve (2), a restoring member for restoring the cap-removing strip (21) to its initial expanded state is also arranged in the cap-removing sleeve (2), and a lifting member for driving the pressing plate (12) to move up and down is arranged on the machine body (1); The cover removal assembly (4) comprises a limit ring (41) elastically slidably connected to the cover removal sleeve (2), a connecting rod (42) fixedly connected between the limit ring (41) and the limit plug (23), an elastic valve plate (43) fixedly connected to the peripheral wall of the limit plug (23), and an exhaust probe (44) fixedly connected to the cover removal sleeve (2), wherein the valve plate (43) is located on a side of the limit ring (41) away from the cover removal strip (21); when the limit ring (41) is in a free state, the limit plug (23) is located on a side of the cover removal strip (21) away from the cover removal conveyor belt (11), and the exhaust probe (44) does not abut against the valve plate (43); when the limit plug (23) enters the cover removal strip (21), the exhaust probe (44) abuts against the valve plate (43); The machine body (1) is fixedly connected with a double-axis movable platform (61) on both sides of the bottle body (81); the output end of the double-axis movable platform (61) is rotatably connected with a power pressure roller (62); the moving directions of the double-axis movable platform (61) are respectively parallel to the length direction of the decapping sleeve (2) and perpendicular to the length direction of the decapping sleeve (2) along a horizontal plane; the machine body (1) is fixedly connected with a visual sensor (63) electrically connected to the double-axis movable platform (61); the machine body (1) is provided with a collection frame (71) below the two power pressure rollers (62); the machine body (1) is also provided with a collection frame (71) below one end of the decapping sleeve (2) close to the bottle body (81); the collection frame (71) is fixedly connected with a guide plate (72) for guiding the detached objects into the collection frame (71); A heating rod (64) is elastically arranged on the pressing plate (12), and the height of the heating rod (64) is lower than the height of the pressing plate (12).

2. The device for pre-processing plastic products for environmentally friendly recycling according to claim 1, characterized in that: A displacement sensor (53) is fixedly connected to the fixed sleeve (51), a detection end of the displacement sensor (53) is fixedly connected to the cover-removing sleeve (2), and the displacement sensor (53) is electrically connected to the hydraulic cylinder (31), the motor (32) and the winding wheel (22) respectively.

3. The device for pre-processing plastic products for environmentally friendly recycling according to claim 2, characterized in that: An electromagnet (24) is fixedly connected to the outer wall of the cover removal sleeve (2), the limiting ring (41) has magnetic force, the electromagnet (24) is located at the free end of the limiting ring (41) close to the cover removal sleeve (2), and the exhaust probe (44) is electrically connected to the electromagnet (24).

4. The device for pre-processing plastic products for environmentally friendly recycling according to claim 1, characterized in that: The machine body (1) is fixedly connected to the bottle body (81) with a gas nozzle (73) which is inclined and located directly below the outlet of the cap-removing sleeve (2).

5. The device for pre-processing plastic products for environmentally friendly recycling according to claim 1, characterized in that: The lifting components are a plurality of electric push rods (13) fixedly connected to the machine body (1) and arranged on both sides of the bottle body (81); the pressing plate (12) is made of a tough material; and friction pads are fixedly connected to the surface of the decapping conveyor belt (11) and the bottom of the pressing plate (12).

6. The device for pre-processing plastic products for environmentally friendly recycling according to claim 1, characterized in that: The restoration member is a plurality of elastic pull cords (25) distributed in an annular shape and fixed to the inner wall of the cover-removing sleeve (2), and the free ends of the elastic pull cords (25) are fixed to the cover-removing strip (21).

7. A method for pre-processing plastic products for environmental protection recycling, based on a device for pre-processing plastic products for environmental protection recycling according to any one of claims 1 to 6, characterized in that: The steps include: S1, loading and fixing: placing the plastic bottle on the cap-removing conveyor belt (11) with the bottle cap (82) facing the cap-removing sleeve (2), so that the plastic bottle is continuously conveyed by the cap-removing conveyor belt (11) until the bottle cap (82) is inserted into the cap-removing sleeve (2), the pressing plate (12) is pressed down, the bottle body (81) is fixed between the cap-removing conveyor belt (11) and the pressing plate (12), and the bottle cap (82) is reeled up by the reel (22), so that the bottle cap (82) is fixed by the cap-removing strip (21); S2, detection and decapping: turning on the heating rod (64) to enable the visual sensor (63) to monitor the bottle body (81) in real time to detect the material of the bottle body (81), turning on the motor (32), and rotating the decapping sleeve (2), so that the decapping strip (21) and the bottle cap (82) fixed thereto rotate accordingly, and at the same time, the decapping sleeve (2) moves in a direction away from the bottle body (81) until the bottle cap (82) is separated from the bottle body (81); S3, material distribution: the stopper (23) pushes the bottle cap (82), and at the same time the cap stripping strip (21) releases the bottle cap (82), so that the bottle cap (82) is pushed out of the cap stripping sleeve (2), and then the air nozzle (73) blows the bottle cap (82) into the corresponding collecting frame (71), and at the same time the visual sensor (63) controls the double-axis moving platform (61) to move, so that the two power pressure rollers (62) clamp and squeeze the bottle body (81), and cooperate with the guiding effect of the guide plate (72) to make the bottle body (81) also fall into the corresponding collecting frame (71).

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