Method for recycling ultra-high molecular weight polyethylene carrier roller

Abstract

A method for recycling an ultra-high molecular weight polyethylene carrier roller relates to the technical field of recycling of non-metal carrier rollers, and comprises the following steps: S1, collecting and recycling obsolete carrier rollers; s2, separation is conducted, specifically, the cylinder body of the ultra-high molecular weight polyethylene carrier roller is separated from the steel lining through a separation machine tool; s3, crushing, namely crushing the separated barrel body through a shredding machine, and ensuring that the surface area of a crushed product is not greater than 2 square centimeters; s4, cleaning and drying, and removing impurities from the crushed product; s5, grinding, namely grinding the dried product through a grinding machine, and standing to obtain the modified ultra-high molecular weight polyethylene material. According to the method, the cylinder body and the steel lining of the ultra-high molecular weight polyethylene carrier roller are separated, the steel lining can be reused without machining treatment, and the cylinder body is reused after being treated in subsequent steps; and the cylinder body can be used as the modified ultra-high molecular weight polyethylene material after being crushed, cleaned, dried and ground.

Description

Technical Field

[0001] The invention relates to the technical field of non-metal roller recycling and reuse, in particular to a method for recycling ultra-high molecular weight polyethylene rollers. Background Art

[0002] Ultra-high molecular weight polyethylene (UHMW-PE), as a special thermoplastic engineering plastic, has a molecular weight of more than 1.5 million and presents a linear structure. This material not only has a heat deformation temperature of 85°C (at 0.46MPa) and a melting point between 130 and 136°C, but is also known for its excellent comprehensive performance. Specifically, UHMW-PE has excellent wear resistance and self-lubricating properties. At the same time, it also exhibits high mechanical strength, excellent chemical stability and good anti-aging ability. It is the preferred material for producing high-quality non-metallic rollers.

[0003] When it comes to the treatment of discarded UHMWPE rollers, especially those that have been eliminated after long-term use by end customers, the common practice is to directly discard them as waste. This treatment method not only wastes valuable resources, but also poses a potential threat to the environment. In fact, these discarded rollers still contain considerable recycling value. Therefore, it is particularly important to explore and develop effective recycling technologies. Through reasonable recycling processes and technical means, not only can environmental pollution be reduced, but also effective redistribution of resources can be achieved, thereby promoting the development of a circular economy. Summary of the invention

[0004] In order to overcome the deficiencies in the background technology, the present invention discloses a method for recycling ultra-high molecular weight polyethylene rollers.

[0005] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solutions: A method for recycling ultra-high molecular weight polyethylene rollers comprises the following steps: S1. Collect and recycle ultra-high molecular weight polyethylene rollers that have been discarded after normal use by end customers; S2, separation, separating the cylinder of the ultra-high molecular weight polyethylene roller from the steel lining by a separation machine; S3, crushing, the separated cylinder is first shredded by a shredder, and the surface area of ​​the shredded product is not more than 5 square centimeters; the shredded product is added with water and put into a pulverizer for crushing, and the surface area of ​​the shredded product is not more than 2 square centimeters; S4, cleaning and drying, putting the crushed product into a water tank to automatically separate the crushed cylinder from impurities, remove impurities, and then spin dry through a spin dryer; S5, grinding, grinding the product obtained after drying in step S4 through a grinding machine, and letting it stand for more than 5 days after grinding before using it as a modified ultra-high molecular weight polyethylene material.

[0006] Preferably, the separation machine tool comprises a frame, a mounting seat and an annular cutter disc; mounting seats are provided at both ends of the top of the frame, one of the mounting seats is equipped with an annular cutter disc, and the other mounting seat is equipped with a telescopic cylinder for pushing the roller through the annular cutter disc; the annular cutter disc is provided with a plurality of cutter heads for cutting the roller body at intervals along the circumferential direction.

[0007] Preferably, a roller supporting device for horizontally supporting the rollers is provided at a position between the two mounting seats corresponding to the top of the frame.

[0008] Preferably, the roller support device comprises two brackets which are correspondingly and firmly connected to the frame, and support rods are provided at the bottom and left and right sides of the brackets.

[0009] Preferably, the support rod shaft is provided with a screw rod which movably penetrates the bracket, and nuts are threadedly connected to the screw rod shaft at both inner and outer sides corresponding to the bracket.

[0010] Preferably, the annular cutter disc is fastened to a cutter seat, the cutter seat is provided with an opening through which the cutter head can movably pass, and a positioning screw for positioning the cutter head is threadedly connected to one side of the cutter seat.

[0011] Preferably, the telescopic rod of the telescopic cylinder is detachably connected with a press-fitting head.

[0012] Due to the adoption of the above-mentioned technical solution, the present invention has the following beneficial effects: The invention discloses a method for recycling an ultra-high molecular weight polyethylene roller. The cylinder body and the steel lining of the ultra-high molecular weight polyethylene roller are separated by a separation machine tool. The steel lining can be reused without processing. The cylinder body is reused after being processed in subsequent steps. The cylinder body can be used as a modified ultra-high molecular weight polyethylene material after being crushed, cleaned, dried and ground.

[0013] The present invention further pushes the roller through the center hole of the annular cutter disc by means of a telescopic cylinder, thereby effectively reducing the labor intensity of the operator; in the process of the roller passing through the annular cutter disc, the cutter head cuts the cylinder of the roller body; during cutting, the tip of the cutter head is 1 to 2 mm away from the steel lining to avoid scratching the steel lining, and after cutting, only force needs to be applied to the cutting edge position of the cylinder to disconnect the cutting edge position of the cylinder, thereby separating the cylinder and the steel lining, and the cylinder is recycled and the steel lining can be directly reused. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the separation machine tool; Figure 2 It is a structural schematic diagram of an annular cutter disc; Figure 3 It is a structural schematic diagram of the roller support device.

[0015] In the figure: 1. frame; 2. mounting base; 3. roller support device; 3-1. bracket; 3-2. support rod; 3-3. screw rod; 3-4. nut; 4. annular cutter disc; 5. telescopic cylinder; 6. cutter head; 7. cutter seat; 8. positioning screw; 9. press-fit head. DETAILED DESCRIPTION

[0016] The present invention can be explained in detail through the following embodiments. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention. In the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "front", "back", "left", "right", etc. indicating directions or positional relationships, they only correspond to the drawings of the present application for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific direction.

[0017] Embodiment 1, a method for recycling ultra-high molecular weight polyethylene rollers, comprising the following steps: S1. Collection: Establish recycling channels: Establish long-term cooperative relationships with end customers, set up special recycling sites or adopt a reverse logistics distribution system to ensure that the ultra-high molecular weight polyethylene rollers that are discarded after normal use by end customers can be effectively recycled.

[0018] Sorting and screening: Conduct a preliminary inspection on the recycled rollers to remove impurities and products that are not suitable for reuse due to severe damage or other reasons.

[0019] S2. Separation: Application of special equipment: The cylinder of the ultra-high molecular weight polyethylene roller is separated from the steel lining by a separation machine. The steel lining can be reused without processing, and the cylinder can be reused after subsequent processing.

[0020] S3, crushing: Pretreatment stage: First, use a shredder to cut the ultra-high molecular weight polyethylene cylinder into small pieces, and the maximum surface area of ​​these pieces should be controlled within 5 square centimeters.

[0021] Fine grinding: These larger pieces are then mixed with water at a mass ratio of 20:1 and put into a grinder for further grinding to a surface area of ​​no more than 2 square centimeters. The presence of water not only reduces the heat generated by friction, but also helps reduce static adsorption. The resulting particles are uniform.

[0022] S4, cleaning and drying: Efficient cleaning: Put the crushed particles into the cleaning water tank and promote the separation between impurities and UHMWPE particles by stirring or other means. Use flotation or sedimentation to achieve better separation effect.

[0023] Environmental protection measures: Considering the effective use of water resources and environmental protection, a circulating water system can be adopted and necessary sewage treatment facilities can be installed to ensure that wastewater is discharged in compliance with standards.

[0024] Dehydration: After cleaning, use a centrifugal dryer to quickly remove moisture and prepare for the next step. For some special occasions, vacuum freeze drying technology can also be considered to obtain products with lower water content.

[0025] S5. Grinding: Precision grinding: The dried UHMWPE particles need to be processed by a high-precision mill until the desired particle size distribution is achieved. During this process, temperature changes must be closely monitored to prevent the material from changing its properties due to heat.

[0026] After being ground and left to stand for more than 5 days, the powder can be used as a modified ultra-high molecular weight polyethylene material for producing ultra-high molecular weight polyethylene cylinders, plates, ordinary pipes or flame-retardant pipes.

[0027] For example, ultra-high molecular weight polyethylene, glass microbeads and carbon black are added to modified ultra-high molecular weight polyethylene, mixed evenly and then extruded into ordinary pipes through an extruder; the mass ratio of modified ultra-high molecular weight polyethylene, ultra-high molecular weight polyethylene, glass microbeads and carbon black is 1050:500:50:1.

[0028] For example: ultra-high molecular weight polyethylene, flame retardant and conductive agent are added to modified ultra-high molecular weight polyethylene and evenly mixed, and then a flame retardant pipe is extruded through an extruder; the mass ratio of modified ultra-high molecular weight polyethylene, ultra-high molecular weight polyethylene, flame retardant and conductive agent is 8:6:3:3.

[0029] Embodiment 2, in combination with Figures 1 to 3 , a method for recycling ultra-high molecular weight polyethylene rollers, which is different from Example 1 in that, based on Example 1, the separation machine tool comprises a frame 1, a mounting seat 2 and an annular cutter disc 4; mounting seats 2 are provided at both ends of the top of the frame 1, one of the mounting seats 2 is provided with an annular cutter disc 4, and the other mounting seat 2 is provided with a telescopic cylinder 5 for pushing the roller through the annular cutter disc 4. The telescopic cylinder 5 can be a hydraulic telescopic cylinder, a pneumatic cylinder or an electric telescopic cylinder. The annular cutter disc 4 is provided with a plurality of cutter heads 6 for cutting the roller cylinder at intervals along the circumferential direction.

[0030] In order to ensure that the roller is evenly stressed during the cutting operation and avoid cutting failure due to bias to one side, the multiple cutter heads 6 should preferably be evenly distributed or symmetrically arranged.

[0031] When in use, first control the telescopic rod of the telescopic cylinder 5 to shorten, the operator aligns one end of the roller with the annular cutter disc 4 to ensure that the roller is coaxial with the annular cutter disc 4, and then starts the telescopic cylinder 5, and pushes the roller through the center hole of the annular cutter disc 4 through the telescopic cylinder 5. In this process, the cutter head 6 cuts the cylinder body of the roller.

[0032] It should be noted that since the roller includes a steel lining and a cylinder tightly mounted outside it, it should be ensured that the cutter head 6 does not directly contact the steel lining during cutting to avoid scratches. Therefore, the tip of the cutter head 6 should be kept 1 to 2 mm away from the steel lining during cutting, so that after cutting, only appropriate force needs to be applied at the cutting position of the cylinder to disconnect the cylinder, so as to separate the cylinder from the steel lining. The cylinder can be recycled, and the steel lining can be directly reused.

[0033] Embodiment 3: It is found in actual use that it is dangerous for operators to hold the rollers during operation, which may easily lead to safety accidents. In addition, there are many specifications of rollers on the market, and rollers of different specifications have different diameters. The fixed cutter head 6 cannot adapt to rollers of different specifications. In order to solve this technical defect, this embodiment is further improved. Combined with Figure 1 and 3 A method for recycling ultra-high molecular weight polyethylene rollers. On the basis of Example 2, a roller support device 3 for horizontally supporting the roller is provided at a position between two mounting seats 2 corresponding to the top of the frame 1, that is, the roller is supported by the roller support device 3. After the roller is placed on the roller support device 3, the roller automatically remains coaxial with the annular cutter disc 4, and the telescopic cylinder 5 can be started. The telescopic cylinder 5 pushes the roller, so that the cylinder body and the cutter head 6 move relative to each other, thereby achieving the purpose of cutting the cylinder body.

[0034] Furthermore, the roller support device 3 includes two brackets 3-1 which are correspondingly and firmly connected to the frame 1, and support rods 3-2 are provided at the bottom and left and right sides of the brackets 3-1, that is, the bottom and left and right sides of the roller are supported respectively by three support rods 3-2, the structure is simple, and the production cost is low, and the support rods 3-2 can be cylindrical, which reduces the friction between the cylinder of the roller and the support rods 3-2.

[0035] Furthermore, the support rod 3-2 is provided with a screw 3-3 which movably passes through the bracket 3-1, and the screw 3-3 is threadedly connected with nuts 3-4 on both the inner and outer sides of the bracket 3-1, that is, the position of the support rod 3-2 can be adjusted by adjusting the position of the nut 3-4 to adapt to rollers of different diameters, that is, when cutting a large diameter roller, the support rod 3-2 is adjusted outward, and when cutting a small diameter roller, the support rod 3-2 is adjusted inward, so that rollers of different diameters can be coaxial with the annular cutter disc 4.

[0036] In order to adapt to rollers of different diameters, the annular cutter disc 4 is fastened with a cutter seat 7. The cutter seat 7 is provided with an opening through which the cutter head 6 can move, and a positioning screw 8 for positioning the cutter head 6 is threadedly connected to one side of the cutter seat 7. That is, the feed amount of the cutter head 6 can be adjusted by loosening the positioning screw 8. That is, when cutting a large-diameter roller, the support rod 3-2 is adjusted outwardly to the cutter head 6, and when cutting a small-diameter roller, the support rod 3-2 is adjusted inwardly to the cutter head 6, so that the tip of the cutter head 6 can be 1 to 2 mm away from the steel lining of the roller, thereby ensuring the cutting effect while avoiding damage to the steel lining.

[0037] The telescopic rod of the telescopic cylinder 5 is detachably connected with a pressing head 9, and the diameter of the pressing head 9 is larger than the diameter of the telescopic rod of the telescopic cylinder 5, which is convenient for aligning the end face of the roller; when cutting rollers of different diameter specifications, pressing heads 9 of different diameters can be replaced to avoid interference between the pressing head 9 and the roller support device 3.

[0038] The parts of the present invention that are not described in detail are prior art. It is obvious to those skilled in the art that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention; therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and it is intended that all changes that fall within the meaning and scope of equivalent elements are included in the present invention.

Claims

1. A method for recycling ultra-high molecular weight polyethylene rollers, characterized in that: The following steps are involved: S1. Collect and recycle ultra-high molecular weight polyethylene rollers that have been discarded after normal use by end customers; S2, separation, separating the cylinder of the ultra-high molecular weight polyethylene roller from the steel lining by a separation machine; S3, crushing, the separated cylinder is first shredded by a shredder, and the surface area of ​​the shredded product is not more than 5 square centimeters; the shredded product is added with water and put into a pulverizer for crushing, and the surface area of ​​the shredded product is not more than 2 square centimeters; S4, cleaning and drying, putting the crushed product into a water tank to automatically separate the crushed cylinder from impurities, remove impurities, and then spin dry through a spin dryer; S5, grinding, grinding the product obtained after drying in step S4 through a grinding machine, and letting it stand for more than 5 days after grinding before using it as a modified ultra-high molecular weight polyethylene material.

2. The method for recycling ultra-high molecular weight polyethylene rollers according to claim 1, characterized in that: The separation machine tool comprises a frame (1), a mounting seat (2) and an annular cutter disc (4); mounting seats (2) are provided at both ends of the top of the frame (1), one of the mounting seats (2) is provided with an annular cutter disc (4), and the other mounting seat (2) is provided with a telescopic cylinder (5) for pushing a roller to pass through the annular cutter disc (4); the annular cutter disc (4) is provided with a plurality of cutter heads (6) for cutting the roller body cylinder at intervals along the annular direction.

3. The method for recycling ultra-high molecular weight polyethylene rollers according to claim 2, characterized in that: A roller support device (3) for horizontally supporting rollers is provided at a position between the two mounting seats (2) on the top of the frame (1).

4. The method for recycling ultra-high molecular weight polyethylene rollers as claimed in claim 3, characterized in that: The roller support device (3) comprises two brackets (3-1) which are correspondingly and firmly connected to the frame (1), and support rods (3-2) are provided at the bottom and left and right sides of the brackets (3-1).

5. The method for recycling ultra-high molecular weight polyethylene rollers according to claim 4, characterized in that: The support rod (3-2) is provided with a screw rod (3-3) that movably penetrates the bracket (3-1), and the screw rod (3-3) is threadedly connected to nuts (3-4) on both the inner and outer sides of the bracket (3-1).

6. The method for recycling ultra-high molecular weight polyethylene rollers according to claim 2, characterized in that: The annular cutter disc (4) is fixedly connected to a cutter seat (7), the cutter seat (7) is provided with an opening through which the cutter head (6) can movably pass, and a positioning screw (8) for positioning the cutter head (6) is threadedly connected to one side of the cutter seat (7).

7. The method for recycling ultra-high molecular weight polyethylene rollers as claimed in claim 2, characterized in that: The telescopic rod of the telescopic cylinder (5) is detachably connected to a pressing head (9).

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