Plastic material edge recycling device and method

Abstract

The invention provides a plastic material edge recycling device and method, relates to the technical field of plastic recycling, and solves the problem of poor fragment uniformity. The device comprises a first conveyor, a heating device, a pressing device and a crushing device. The first conveyor can convey the material edge to the heating section through the first conveyor so that the material edge can be heated by the heating device to be in a softened state. And the softened material edge is pressed by the pressing equipment to form a transverse indentation groove. And after the first conveyor outputs the softened material edge out of the heating section, the material edge can be gradually cooled and hardened to obtain a stable indentation groove. And the indentation groove becomes a weak part of the material edge. After the material edges are conveyed to the crushing equipment by the first conveyor, due to the indentation grooves formed in the material edges, under the crushing effect of the crushing equipment, the material edges are easier to break with the indentation grooves as boundaries. In this way, only pressing equipment is needed to press the indentation grooves in the material edge at certain intervals, and fragments more uniform in size and shape can be obtained easily.

Description

Technical Field

[0001] This invention relates to the field of plastic recycling technology, specifically to a device and method for recycling and reusing plastic materials. Background Technology

[0002] During the molding and processing of plastic products, some scrap material is generated. This scrap material typically accounts for more than 5% of a single injection molding process and is the main source of waste in plastic processing. This scrap material is usually clean, and its material and properties are similar to those of the product. If this clean scrap material can be recycled and blended with virgin material in a certain proportion for use in the production of plastic products, the use of virgin material can be reduced, which is significant in terms of both economic benefits and environmental protection.

[0003] Currently, edge material recycling often involves directly feeding the collected edge material into a high-powered crusher for crushing. This crushing method is highly random, and the edge material is easily broken into fragments of uneven size and shape. The unevenness of the fragments can lead to uneven melting or blockage of the feed inlet during subsequent melting and granulation, resulting in discontinuous and unstable feeding, ultimately affecting the stability of the quality of recycled material products and the energy consumption level. Summary of the Invention

[0004] The purpose of this invention is to design a device and method for recycling and reusing plastic scrap to solve the problem of poor uniformity of the scrap.

[0005] This invention is achieved through the following technical solution:

[0006] This invention provides a plastic scrap recycling device, comprising a first conveyor, a heating device, a pressing device, and a crushing device. The first conveyor is used to transport scrap along a conveying route via a first conveyor belt. The first conveyor has heating sections and cooling sections sequentially distributed downstream along the conveying route. The heating device is correspondingly disposed in the heating section and is used to provide heat to soften the scrap located in the heating section. The pressing device is correspondingly disposed in the heating section and is provided with a pressing head that can move relative to the first conveyor belt between a first position and a second position. In the first position, the vertical distance between the pressing head and the first conveyor belt is greater than 0 and less than the vertical distance of the scrap above the first conveyor belt. In the second position, the vertical distance between the pressing head and the first conveyor belt is greater than the vertical distance of the scrap above the first conveyor belt. The crushing device is disposed at the end of the conveying route and is used to receive and crush the scrap output by the first conveyor belt.

[0007] With the above-described structure, the first conveyor transports the material edge to the heating zone via the first conveyor belt. Under the heating effect of the heating equipment, the material softens, allowing it to be subsequently pressed and shaped by the pressing equipment to form an indentation groove running across the material edge. After the first conveyor transports the softened material edge with the indentation groove from the heating zone via the first conveyor belt, the material edge gradually cools and hardens to obtain a stable indentation groove, making the indentation groove a weak point on the material edge. After the material edge is transported to the crushing equipment by the first conveyor belt, due to the indentation groove, the material edge is more likely to fracture along the indentation groove boundary under the crushing action of the crushing equipment. Thus, by simply pressing an indentation groove at regular intervals on the material edge using the pressing equipment, it is easy to obtain fragments with more uniform size and shape, thereby alleviating or even eliminating uneven melting or clogging of the feed inlet during melt granulation, ultimately improving the stability of the recycled material product quality and reducing energy consumption.

[0008] To further improve the implementation of the present invention, the following configuration structure is adopted: the pressing device includes a second conveyor located above the first conveyor and extending parallel to the conveying route; the second conveyor is fixed with the pressing head that can move cyclically with it; when the pressing head is in the outgoing section of the second conveyor, it is in the first position and moves synchronously with the material edge; when the pressing head is in the return section of the second conveyor, it is in the second position.

[0009] To further improve the implementation of the present invention, the following configuration structure is adopted: the second conveyor belt of the second conveyor is provided with a transverse through mounting groove, and the root of the pressing head is detachably connected to the mounting groove.

[0010] When the above-mentioned structure is adopted, the pressing head can be detachably connected to the mounting groove. Different shapes of pressing heads can be replaced according to the shape and size of the material edge, and worn pressing heads can also be replaced separately.

[0011] To further improve the implementation of the present invention, the following configuration structure is adopted: the second conveyor is fixedly connected to a plurality of pressing heads arranged equidistantly along its extension direction, so that at least two of the pressing heads can be simultaneously in the first position.

[0012] With the above-described structure, multiple pressing heads equidistantly arranged on the second conveyor can simultaneously press out multiple equally spaced indentation grooves along a certain length of material edge. Furthermore, each pressing head can move synchronously with the material edge to maintain the size and shape of the indentation grooves, ensuring greater uniformity in the grooves and more balanced crushing effect across different sections of the material edge. This not only yields more uniform fragments but also allows the crushing equipment to operate at a reasonable power level, reducing energy consumption and noise. The simultaneous pressing of two adjacent pressing heads against the material edge cuts off material flow between two adjacent indentation grooves, better maintaining the quality of individual fragments and ensuring their uniformity.

[0013] To further improve the implementation of this invention, the following structure is specifically adopted: the head of the pressing head gradually thickens towards the root.

[0014] To further improve the implementation of the present invention, the following configuration is adopted: the pressing head is arranged to extend laterally along the second conveyor.

[0015] To further improve the implementation of the present invention, the following configuration is adopted: the second conveyor extends from the heating section to the cooling section.

[0016] When the above-mentioned structure is adopted, the second conveyor extends into the cooling section. In this way, the pressing head connected to the second conveyor can be kept in the indentation groove and moved to the cooling section. It can leave the indentation groove after the indentation groove has been cooled and stabilized. This results in indentation grooves with more consistent size and shape.

[0017] To further improve the implementation of the present invention, the following configuration is adopted: the end of the second conveyor is correspondingly located at the end of the first conveyor.

[0018] To further improve the implementation of the present invention, the following configuration structure is adopted: the heating device includes a heating chamber that runs through the conveying route, the heating chamber is equipped with a first heater for heating its internal environment, and the first conveyor and the pressing device are arranged inside the heating chamber.

[0019] To further improve the implementation of the present invention, the following configuration structure is specifically adopted: a roller mechanism is provided upstream of the first conveyor, the roller mechanism including an upper groove roller and a lower groove roller arranged vertically, a shaped hole for clamping the conveyed material edge is formed between the roller surfaces of the upper groove roller and the lower groove roller, the cross-sectional shape of the shaped hole matches the cross-sectional shape of the material edge, and the axis of the shaped hole is located above the first conveyor belt and parallel to the axis of the first conveyor belt.

[0020] When the above-mentioned structure is adopted, the axis of the die hole of the roller mechanism is located above and parallel to the axis of the first conveyor belt. The material edge fed into the die hole can be output to the surface of the first conveyor belt in an attitude parallel to the axis of the first conveyor belt. This allows the pressing equipment to uniformly press each segment on the material edge in the subsequent process, so as to obtain fragments with a higher degree of uniformity.

[0021] To further improve the present invention, the following configuration is adopted: a plurality of the aforementioned holes are formed between the roller surfaces of the upper groove roller and the lower groove roller in a transverse sequence.

[0022] When the above-mentioned structure is adopted, the roller mechanism has multiple transversely arranged holes, which can process multiple material edges at the same time and has higher processing efficiency.

[0023] To further improve the implementation of the present invention, the following configuration is adopted: the upper grooved roller and / or the lower grooved roller are connected to a second heater, which is used to heat the roller surface to preheat the material edge.

[0024] When the above-mentioned structure is adopted, the roller mechanism can preheat the edge of the material fed into the die hole, which can reduce the length of the heating equipment and the length of the first conveyor to a certain extent.

[0025] To further improve the implementation of the present invention, the following structure is specifically adopted: the surface of the first conveyor belt used for carrying material is provided with evenly distributed protrusions.

[0026] When the above-mentioned structure is adopted, the protrusions on the surface of the first conveyor belt can reduce the contact area with the material edge to a certain extent, reduce the probability and degree of adhesion, and also reduce the heat transfer efficiency to better maintain the temperature.

[0027] To further improve the implementation of the present invention, the following structure is specifically adopted: the plastic material edge recycling and reuse device further includes a cooling device, which is correspondingly arranged in the cooling section to provide cooling capacity for the material edge.

[0028] When the above-mentioned structure is adopted, the cooling equipment added to the cooling section of the first conveyor belt can accelerate the cooling speed of the material edge and the pressing head. In this way, while ensuring that the material edge is cooled in place, the length of the cooling section of the first conveyor is reduced, thereby simplifying the device structure and footprint.

[0029] To further improve the implementation of this invention, the following structure is specifically adopted: the crushing device includes an outer cylinder with a feed inlet at the top and a discharge outlet at the bottom, and a rotary drum rotatably disposed within the outer cylinder, which has a feed inlet at the top and is closed at the bottom. The rotary drum has a discharge hole on its peripheral wall. The outer cylinder is equipped with a driving device, which is connected to the rotary drum and is used to drive the rotary drum to rotate so as to throw the material edge out from the discharge hole to the inner peripheral surface of the outer cylinder wall.

[0030] To further improve the implementation of this invention, the following structure is specifically adopted: the bottom of the outer cylinder is configured as a conical disc with the center protruding upwards.

[0031] To further improve the present invention, the following structure is adopted: the outer cylinder is provided with a plurality of protruding nails, which protrude from the inner circumferential surface of the outer cylinder wall and are located on the discharge path of the discharge hole.

[0032] When the above-mentioned structure is adopted, the protruding nails on the outer cylinder protrude from the inner circumferential surface of the outer cylinder wall, which can improve the degree of collision with the material edge.

[0033] To further improve the present invention, the following structure is adopted: a discharge plate inclined toward the discharge port is installed inside the outer cylinder, and the discharge plate is located below the rotary cylinder.

[0034] The present invention also provides a method for recycling and reusing plastic scrap, which uses the above-mentioned plastic scrap recycling and reusing device to recycle crushed scrap, and includes the following steps:

[0035] Step S1: The material is conveyed along the conveying route to the heating section using the first conveyor belt of the first conveyor.

[0036] Step S2: Use heating equipment to heat the material edge in the heating section, so that the material edge gradually heats up and reaches a softened state;

[0037] Step S3: Using a pressing device, the pressing head is moved downward to squeeze the softened material edge to form a transverse through-groove on the material edge.

[0038] Step S4: The material edge with the indentation groove is transported along the conveying route by the first conveyor belt of the first conveyor to the cooling section and gradually cooled and hardened along the way;

[0039] Step S5: The hardened material edge is conveyed along the conveying route to the end of the conveying route using the first conveyor belt of the first conveyor, so that the material edge reaches the crushing equipment;

[0040] Step S6: Use crushing equipment to crush the hardened material edge to obtain multiple fragments that fracture brittlely from the indentation groove.

[0041] The present invention has the following advantages and beneficial effects:

[0042] In this invention, a first conveyor transports the material edge to the heating zone via a first conveyor belt. Under the heating effect of the heating equipment, the material edge softens, allowing it to be subsequently pressed and shaped by a pressing device to form an indentation groove running across the edge. After the first conveyor transports the softened material edge with the indentation groove from the heating zone, it gradually cools and hardens to obtain a stable indentation groove, making the indentation groove a weak point. When the material edge is transported to the crushing device, due to the indentation groove, it is more prone to fracture along the indentation groove boundary under the crushing action. Thus, by simply pressing an indentation groove at regular intervals along the material edge using the pressing device, more uniformly sized and shaped fragments can be easily obtained. This alleviates or even eliminates uneven melting or clogging of the feed inlet during melt granulation, ultimately improving the stability of recycled material product quality and reducing energy consumption. Attached Figure Description

[0043] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0044] Figure 1 This is a schematic diagram of the downstream structure of a plastic material recycling and reuse device;

[0045] Figure 2 This is a schematic diagram of the upstream structure of a plastic material recycling and reuse device. Cooling equipment is not shown in the diagram.

[0046] Figure 3 This is a schematic diagram of the layout structure of the roller mechanism, pressing equipment, first conveyor and crushing equipment;

[0047] Figure 4 This is a schematic diagram of the layout structure of the roller mechanism, the pressing equipment, and the first conveyor;

[0048] Figure 5 yes Figure 4 A magnified schematic diagram of part A in the middle;

[0049] Figure 6 This is a schematic diagram of the connection structure between the rotary drum and the drive device;

[0050] Figure 7 This is a schematic diagram of the internal structure of the crushing equipment;

[0051] Figure 8 This is a schematic diagram of the process of pressing grooves on the edge of the material using a pressing device.

[0052] The diagram is marked as follows:

[0053] 100. Plastic scrap recycling and reuse device;

[0054] 10. First conveyor; 11. First conveyor belt; 111. Protrusion;

[0055] 20. Heating equipment; 21. Heating chamber; 22. First heater;

[0056] 30. Pressing equipment; 31. Second conveyor; 311. Second conveyor belt; 312. Mounting trough; 32. Pressing head;

[0057] 40. Cooling equipment; 41. Cooling box; 42. Air intake fan;

[0058] 50. Crushing equipment; 51. Outer cylinder; 511. Feed inlet; 512. Discharge outlet; 52. Rotary drum; 521. Feed inlet; 522. Discharge hole; 523. Conical disc; 53. Drive unit; 54. Convex nail; 55. Feed plate; 56. Slewing bearing;

[0059] 60. Roller mechanism; 61. Upper grooved roller; 62. Lower grooved roller; 63. Cavity; 64. Second heater;

[0060] 70. Rack;

[0061] 200, material edge; 201, indentation groove. Detailed Implementation

[0062] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0063] In the description of this application, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0064] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class, not limited in number; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship. In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0065] On one hand, the present invention discloses a plastic edge recycling and reuse device 100, which includes a frame 70 and a first conveyor 10 installed on the frame 70.

[0066] like Figure 1 , Figure 2 As shown, the first conveyor 10 includes a frame, rollers mounted on the frame head and tail, and a first conveyor belt 11 arranged around the rollers. The first conveyor 10 is horizontally arranged and extends longitudinally, and is used to transport the material edge 200 input from the head along the conveying path to the tail output via the first conveyor belt 11.

[0067] When the material edge 200 is heated to its glass transition temperature, it will soften and become malleable. (Reference) Figure 8 When a hard object is pressed against the surface of the material edge 200, an indentation can be formed. After recooling, the indentation will harden again and form a new indentation. The material of the material edge 200 can be amorphous plastics such as ABS, PS, PC, and PMMA, which are hard plastics that are somewhat brittle at room temperature.

[0068] like Figure 2As shown, along the conveying route, the first conveyor 10 has heating sections and cooling sections sequentially distributed from upstream to downstream. Heating devices 20 are installed at the heating sections, generating heat to raise the ambient temperature of this section, thereby heating the material edge 200 passing through this section via thermal radiation. The heating devices 20 are configured with appropriate heating power so that the material edge 200 passing through the heating section can be gradually heated to a softened state and maintained for a period of time without reaching a melted state. The cooling sections are of sufficient length to allow the material edge 200 exiting the heating sections to be sufficiently cooled for re-hardening. The heaters of the heating devices 20 can be electric hot air blowers or electric heating tubes.

[0069] like Figure 2 and Figure 3 As shown, a pressing device 30 is also installed on the frame 70 in the heating section of the first conveyor 10, and the pressing device 30 is positioned above the first conveyor 10. The pressing device 30 is equipped with a pressing head 32, which can be driven to move up and down relative to the first conveyor belt 11 of the first conveyor 10 to switch between a first position and a second position. Throughout the entire movement of the pressing head 32, a vertical gap is formed between it and the first conveyor belt 11, that is, the vertical distance between the pressing head 32 and the first conveyor belt 11 is always greater than 0.

[0070] like Figure 3 As shown, the initial pressing position of the pressing device 30 is downstream of the initial heating position of the heating device 20, so that when the pressing head 32 of the pressing device 30 squeezes the material edge 200, the material edge 200 is in a softened state. Of course, the initial pressing position of the pressing device 30 can also be at the same position as the initial heating position of the heating device 20.

[0071] refer to Figure 8 When the pressing head 32 is in the first position relative to the first conveyor belt 11, the vertical distance between the pressing head 32 and the first conveyor belt 11 is less than the vertical distance between the material edge 200 and the first conveyor belt 11. This allows the pressing head 32 to vertically press the surface of the material edge 200 when it is in a softened state, forming an indentation groove 201 on the material edge 200. When the pressing head 32 is in the second position relative to the first conveyor belt 11, the vertical distance between the pressing head 32 and the first conveyor belt 11 is greater than the vertical distance between the material edge 200 and the first conveyor belt 11. In this case, the pressing head 32 moves upward to a position where it is detached from the material edge 200. When the pressing head 32 is detached from the material edge 200, the indentation groove 201 on the material edge 200 can maintain its size and shape to a certain extent.

[0072] For example, the pressing device 30 includes a pneumatic cylinder or an electric cylinder, and a pressing head 32 disposed at the shaft end of the pneumatic cylinder or electric cylinder, the pressing head 32 being arranged vertically downward. By controlling the extension and retraction frequency of the pneumatic cylinder or electric cylinder, the pressing timing can be adjusted to adjust the spacing between two adjacent indentation grooves 201 to obtain uniform fragments of the required size.

[0073] like Figure 1 - Figure 3 As shown, a crushing device 50 is installed at the end of the first conveyor 10, i.e., at the downstream end of the conveying route. The crushing device 50 is used to receive and crush the material edge 200 output by the first conveyor belt 11. The crushing device 50 has a feed inlet 511 and a discharge outlet 512. The material edge 200 is placed on the first conveyor belt 11 and can be transported from upstream to downstream by the first conveyor belt 11. Finally, it detaches from the first conveyor belt 11 at the turning point at the end of the first conveyor belt 11 and moves to the feed inlet 511 of the crushing device 50. After the material edge 200 enters the crushing device 50 from the feed inlet 511, it can be crushed into fragments by the operating crushing device 50, and the fragments will be discharged from the discharge outlet 512.

[0074] After obtaining the fragments, they can be screened again to obtain more uniform fragments. Fragments that are too large or too small are discarded, or the oversized fragments are fed into a crushing device for further crushing.

[0075] In this embodiment, the recycled material edge 200 is made of hard plastic, which is brittle at room temperature. The material edge 200 is placed on the first conveyor belt 11 of the first conveyor 10. The operating first conveyor belt 11 continuously transports the material edge 200 upstream to downstream along the conveying route. The material edge 200 is first transported to the heating section, where it is heated by the heating device 20 and softened, transforming it from hard and brittle to a soft and elastic material with good plasticity. This allows it to be subsequently pressed and shaped by the pressing device 30 to form indentation grooves 201 that run through the material edge 200. The material edge 200 in the softened state is pressed with several indentation grooves 201 on its surface by the pressing device 30. Subsequently, the material edge 200 is output from the heating section by the first conveyor belt 11 and enters the cooling section. In the cooling section, the material edge 200 gradually cools and hardens, and the indentation grooves 201 are shaped, becoming the weak part of the material edge 200 that is prone to stress concentration and fracture. After the cooled and hardened material edge 200 is conveyed to the crushing equipment 50 by the first conveyor belt 11, due to the indentation grooves 201 present on the material edge 200, the external force is concentrated on the weak part where the indentation grooves 201 are located under the crushing action of the crushing equipment 50. This makes the material edge 200 more likely to break at the boundary of the indentation grooves 201, reducing the possibility of random breakage. Thus, when the material edge 200 is long enough or the required uniform fragments are short enough, an indentation groove 201 can be pressed into the material edge 200 at certain intervals using the pressing equipment 30, making it easy to obtain fragments with uniform size and shape. After the uniformity of the fragments is improved, the flowability and bulk density of the fragments are more stable, which can alleviate or even eliminate the blockage of the feed port and uneven heating and melting in the melting cavity during melt granulation, ultimately improving the quality stability of recycled material products. After the uniformity of the fragments is improved, the feeding and plasticizing process of the melt granulation equipment is more stable, and the system power can be maintained at a relatively economical level, thereby reducing energy consumption.

[0076] According to some optional embodiments, such as Figure 1 - Figure 5 As shown, the pressing device 30 includes a second conveyor 31 and a pressing head 32 mounted on the second conveyor 31. The second conveyor 31 is located above the first conveyor 10 and is fixedly connected to the frame 70. The second conveyor 31 is horizontally arranged and extends longitudinally. The pressing head 32 is fixedly connected to the second conveyor belt 311, which extends parallel to the conveying route. The pressing head 32 can move cyclically with the second conveyor belt 311. When the pressing head 32 is in the outgoing section of the second conveyor belt 311, the pressing head 32 is in a first position relative to the first conveyor belt 11; when the pressing head 32 is in the return section of the second conveyor belt 311, the pressing head 32 is in a second position relative to the first conveyor belt 11.

[0077] For example, the pressing head 32 is fixed to the second conveyor belt 311 by bolts.

[0078] The first conveyor 10 and the second conveyor 31 operate synchronously. The rollers of the first conveyor 10 and the rollers of the second conveyor 31 can be driven synchronously by separate motors or connected by a synchronous belt drive to ensure that the running speeds of the first conveyor belt 11 and the second conveyor belt 311 are consistent. When the pressing head 32 is in the outgoing section of the second conveyor 31, the pressing head 32 can press on the material edge 200 and move synchronously with the material edge 200 for a certain distance. During this synchronous movement, the pressing head 32 can continuously press the material edge 200, maintaining the size and shape of the indentation groove 201, so that the indentation groove 201 finally formed on the material edge 200 can be more consistent, and the crushing effect of each section of the subsequent material edge 200 is more balanced.

[0079] In some embodiments, such as Figure 5 As shown, a transversely penetrating mounting groove 312 is provided on the outer surface of the second conveyor belt 311 of the second conveyor 31. The root of the pressing head 32 extends into the mounting groove 312 and is detachably connected to it. In this embodiment, the mounting groove 312 is a T-shaped groove. The root of the pressing head 32 is a T-shaped portion, and the root of the pressing head 32 slides into the mounting groove 312 from one end to be installed in the mounting groove 312. The pressing head 32 is detachably connected to the mounting groove 312, and different shaped pressing heads 32 can be replaced according to the shape and size of the material edge 200, or worn pressing heads 32 can be replaced individually.

[0080] The cross-section of the head and body of the pressing head 32, excluding the root, is roughly triangular, and the pressing head 32 gradually thickens from the head to the body, and the body of the pressing head 32 gradually thickens from the root.

[0081] like Figure 1 , Figure 2 and Figure 5 As shown, the pressing head 32 extends laterally along the second conveyor 31. The lateral length of the pressing head 32 is at most equal to the lateral width of the second conveyor belt 311, so as to be able to accommodate the wider material edge 200 or to accommodate multiple material edges 200 conveyed side by side in the lateral direction at one time.

[0082] In some embodiments, such as Figure 1 - Figure 5As shown, a plurality of pressing heads 32 are fixedly connected to the second conveyor belt 311 of the second conveyor 31. These pressing heads 32 are arranged sequentially and equidistantly along the extension direction of the second conveyor belt 311, and at least two of these pressing heads 32 can simultaneously be in a first position relative to the first conveyor 10. The second conveyor belt 311 of the second conveyor 31 is provided with a plurality of mounting grooves 312 arranged sequentially and equidistantly along its length. All pressing heads 32 are detachably mounted in their respective mounting grooves 312. The plurality of pressing heads 32 arranged equidistantly on the second conveyor 31 can simultaneously press out a plurality of equally spaced indentation grooves 201 on a certain length of material edge 200, making the crushing effect of each section of the subsequent material edge 200 more balanced, thereby obtaining more uniform fragments. This allows the crushing equipment 50 to operate at a reasonable power level, reducing energy consumption and noise. When two adjacent pressing heads 32 press against the material edge 200 at the same time, the material flow in the part of the material edge 200 between the two adjacent indentation grooves 201 can be cut off, which can better maintain the quality of individual fragments and ensure the uniformity of the fragments.

[0083] In addition to those connected to the pressing head 32, the mounting slots 312 on the second conveyor belt 311 may also include those that are not connected to the pressing head 32 and are in an idle state. The idle mounting slots 312 are used to install a new pressing head 32 when it is necessary to adjust the pressing head 32, such as when the distance between adjacent pressing heads 32 is reduced to half of the original level.

[0084] In some embodiments, such as Figure 1 - Figure 3 As shown, the second conveyor 31 extends from the heating section to the cooling section, so that the outward section of the second conveyor belt 311 passes through both the heating and cooling sections. Thus, after the pressing head 32 connected to the second conveyor 31 presses the material edge 200 downward in the heating section, it can remain within the indentation groove 201, moving from the heating section to the cooling section. After the material edge 200 cools to a certain degree, forming an indentation groove 201 with a certain degree of stability, it then leaves the indentation groove 201.

[0085] If the second conveyor 31 can eventually pass through more cooling sections, the pressing head 31 can cool and harden at the material edge 200 and obtain a stable indentation groove 201 before leaving the indentation groove 201. This results in indentation grooves 201 with more consistent size and shape. For example, if the end of the second conveyor 31 is located at the end of the first conveyor 10, the second conveyor 31 can pass through all cooling sections.

[0086] According to some optional embodiments, such as Figure 1 and Figure 2As shown, the heating device 20 includes a heating chamber 21 and a first heater 22 installed in the heating chamber 21. The heating chamber 21 is fixedly installed on the frame 70. The heating chamber 21 has an internal space that runs through the conveying route, surrounding the first conveyor 10 and the pressing device 30 circumferentially, such that the second conveyor 31 of the first conveyor 10 and the pressing device 30 passes longitudinally through the internal space of the heating chamber 21. The first heater 22 is used to heat the internal environment of the heating chamber 21, and heats the material edge 200 located in the internal space of the heating chamber 21 by the internal ambient temperature, so that it gradually reaches a softened state.

[0087] For example, the first heater 22 is configured as a hot air blower.

[0088] For example, the first heater 22 electric heating tube device includes an electric heating coil disposed on the inner wall of the heating chamber 21 and an electrical control box installed on the outer wall of the heating chamber 21.

[0089] According to some optional embodiments, such as Figure 1 - Figure 5 As shown, the plastic scrap recycling device 100 is equipped with a roller mechanism 60. The roller mechanism 60 is integrally located at the beginning of the first conveyor 10, that is, at the upstream end of the first conveyor 10 on the conveying route. The roller mechanism 60 includes an upper grooved roller 61 and a lower grooved roller 62 arranged vertically and mounted on a frame 70. One or both of the upper grooved roller 61 and the lower grooved roller 62 are connected to a drive motor at their ends to drive their rotation. A shaped hole 63 is formed between the roller surfaces of the upper grooved roller 61 and the lower grooved roller 62 for clamping and conveying the scrap 200 to the first conveyor 10 by friction. The axis of the shaped hole 63 is located above and parallel to the axis of the first conveyor belt 11, which allows the scrap 200 fed into the shaped hole 63 to be output to the surface of the first conveyor belt 11 in an attitude parallel to the axis of the first conveyor belt 11. This enables the pressing equipment 30 to uniformly press the scrap 200 into segments, thereby obtaining fragments with a higher degree of uniformity.

[0090] The upper grooved roller 61 has a first annular groove on its roller surface, and the lower grooved roller 62 has a second annular groove on its roller surface. The first and second annular grooves are aligned vertically to form a forming hole 63. For different plastic product production lines, the cross-section of the resulting material edge 200 is different. In order to achieve a better straightening and conveying effect on the material edge 200, so that the material edge 200 can be conveyed to the first conveyor belt 11 in an attitude parallel to the conveying route, the cross-sectional shape of the forming hole 63 of the roller mechanism 60 in the plastic material edge recycling and reuse device 100 of the present invention matches the cross-sectional shape of the material edge 200 to be processed.

[0091] In some embodiments, such as Figure 4As shown, the upper grooved roller 61 has at least two first annular grooves arranged sequentially in the transverse direction on its roller surface, while the lower grooved roller 62 has at least two second annular grooves arranged sequentially in the transverse direction on its roller surface. Thus, a plurality of transversely arranged perforations 63 are formed between the roller surfaces of the upper grooved roller 61 and the lower grooved roller 62, which are arranged opposite each other. This arrangement of multiple perforations 63 allows the roller mechanism 60 to process multiple material edges 200 simultaneously, resulting in higher processing efficiency.

[0092] In some embodiments, such as Figure 2 As shown, the roller mechanism 60 can heat the material edge 200 while conveying it. Specifically, one or both of the upper grooved roller 61 and the lower grooved roller 62 are connected to a second heater 64, which is configured as an electric heating tube axially inserted into the center hole of the corresponding upper grooved roller 61 and lower grooved roller 62. The second heater 64 can be fixedly mounted on the frame 70, or it can rotate synchronously with the corresponding upper grooved roller 61 and lower grooved roller 62 and be connected to a power source through an electric slip ring. The second heater 64 can heat the roller surface to preheat the material edge 200, which can reduce the length of the heating device 20 and the length of the first conveyor 10 to a certain extent.

[0093] According to some optional embodiments, such as Figure 5 As shown, the surface of the first conveyor belt 11 used to carry the material edge 200 is provided with evenly distributed protrusions 111. These protrusions 111 can reduce the contact area with the material edge 200 to a certain extent, reduce the probability and degree of adhesion, and also reduce the heat transfer efficiency to better maintain the temperature.

[0094] According to some optional embodiments, such as Figure 1As shown, the plastic scrap recycling device 100 is equipped with a cooling device 40, which is mounted on the frame 70 and correspondingly positioned in the cooling section to provide cooling for the scrap 200. Specifically, the cooling device 40 includes a cooling box 41 and a fan. The cooling box 41 is fixedly mounted on the frame 70, and the fan is fixedly mounted on the cooling box 71 to provide cooling air into the cooling box 71. The cooling box 71 has an internal space that runs through the conveying route, surrounding the first conveyor 10 and the pressing device 30 circumferentially, allowing the second conveyor 31 of the first conveyor 10 and the pressing device 30 to pass longitudinally through the internal space of the cooling box 71. The cooling box 71 also has transversely extending ventilation holes. The fan includes an inlet fan 42 and an outlet fan, which are fixedly mounted on the cooling box 71 and arranged opposite each other in the transverse direction to form a transverse air duct in the internal space of the cooling box 71. The cooling device 40 added to the cooling section of the first conveyor belt 11 in this embodiment can accelerate the cooling speed of the material edge 200 and the pressing head 32. In this way, while ensuring that the material edge 200 is cooled in place, the length of the cooling section of the first conveyor 10 is reduced, thereby simplifying the device structure and footprint.

[0095] According to some optional embodiments, such as Figure 1 - Figure 3 , Figure 6 and Figure 7 As shown, the crushing equipment 50 includes an outer cylinder 51, a rotary drum 52, and a drive device 53. The outer cylinder 51 has a feed inlet 511 at the top and a discharge outlet 512 at the bottom. The rotary drum 52 is integrally housed within the outer cylinder 51, and its top flange is mounted on the inner support frame of the outer cylinder 51 via a slewing bearing 56, allowing the rotary drum 52 to rotate around its axis within the outer cylinder 51. The outer cylinder 51 has a feed inlet 521 at the top and is closed at the bottom, with multiple circumferentially distributed discharge holes 522 at the bottom of the rotary drum 52's circumferential wall. The drive device 53 is mounted on the outer cylinder 51 and connected to the bottom of the rotary drum 52, driving the rotary drum 52 to rotate and throw the material edge 200 out through the discharge holes 522 to the inner circumferential surface of the outer cylinder 51.

[0096] In this embodiment, the crushing device 50 uses centrifugal crushing to throw the material edge 200 towards the inner circumferential surface of the outer cylinder 51. Through the impact force of the material edge 200 with the outer cylinder 51 and other material edges 200, the material edge 200 breaks through the indentation groove 201, resulting in fragments. Because the material edge 200 has a pre-formed indentation groove 201, the material edge 200 can achieve a crushing effect through this relatively gentle centrifugal crushing method, resulting in better uniformity of the fragments. At the same time, it also effectively controls the noise of the crushing device 50.

[0097] In some embodiments, such as Figure 6As shown, the bottom of the outer cylinder 51 is configured as a conical disk 523 with the center protruding upwards, which closes the bottom of the outer cylinder 51. The conical disk 523 enables the material edge 200 falling from the top feed port 511 of the outer cylinder 51 to be more evenly distributed on different heights of the disk surface, ultimately resulting in a more uniform vertical distribution of the material edge 200 thrown out by the conical disk 523.

[0098] In some embodiments, such as Figure 1 - Figure 3 and Figure 7 As shown, a plurality of protruding nails 54 are detachably inserted into the wall of the outer cylinder 51, evenly distributed on the wall. The protruding ends of the nails 54 protrude from the inner circumferential surface of the outer cylinder 51 and are located on the discharge path of the discharge hole 522, while the free ends of the nails 54 are located on the outer side of the cylinder wall. The protruding nails 54 on the outer cylinder 51 protrude from the inner circumferential surface of the outer cylinder 51, which can increase the unevenness of the inner circumferential surface of the outer cylinder 51, thereby increasing the degree of collision with the material edge 200, so that the material edge 200 can break more fully from the indentation groove 201.

[0099] In some embodiments, such as Figure 7 As shown, a discharge plate 55 inclined toward the discharge port 512 is installed inside the outer cylinder 51. The discharge plate 55 is located below the rotary drum 52 and is used to guide the fragments falling onto the discharge plate 55 toward the discharge port 512 of the outer cylinder 51 so that the discharge can be smooth.

[0100] On the other hand, this invention discloses a method for recycling and reusing plastic scrap edges. This method uses the plastic scrap edge recycling and reusing device 100 from any of the above embodiments to recycle the broken scrap edges 200 to obtain uniform fragments. The method includes the following steps:

[0101] Step S1: The material edge 200 is conveyed to the heating section along the conveying route using the first conveyor belt 11 of the first conveyor 10.

[0102] Step S2: The heating device 20 is used to heat the material edge 200 in the heating section, so that the material edge 200 gradually heats up and reaches a softened state.

[0103] In step S3, the pressing head 32 is pressed downward by the pressing device 30 to extrude the softened material edge 200, so as to form a transverse through-groove 201 on the material edge 200.

[0104] In step S4, the material edge 200 with the indentation groove 201 is transported along the conveying route by the first conveyor belt 11 of the first conveyor 10 to the cooling section and gradually cooled and hardened along the way.

[0105] In step S5, the hardened material edge 200 is conveyed along the conveying route by the first conveyor belt 11 of the first conveyor 10 to the end of the conveying route, so that the material edge 200 reaches the crushing equipment 50.

[0106] Step S6: Use crushing equipment 50 to crush the hardened material edge 200 to obtain multiple fragments that fracture brittlely from the indentation groove 201.

[0107] According to some optional embodiments, in step S1, the material edge 200 is fed into the inlet of the profile hole 63 of the roller mechanism 60, and the material edge 200 is straightened by the roller mechanism 60 and output to the conveyor belt 11 of the first conveyor 10.

[0108] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0109] Furthermore, it should be noted that the scope of the methods and apparatus in the embodiments of this application is not limited to performing functions in the order shown or discussed. It may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0110] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A plastic flash recycling device, characterized by: The application relates to a first conveyor (10) for conveying a material edge (200) along a conveying route by a first conveying belt (11), wherein the first conveyor (10) comprises a heating section and a cooling section arranged in sequence along the conveying route in a downstream direction; a heating device (20) arranged in correspondence with the heating section, for providing heat to the material edge (200) located in the heating section to reach a softened state; a pressing device (30) arranged in correspondence with the heating section, wherein the pressing device (30) is provided with a pressing head (32) capable of moving relative to the first conveying belt (11) between a first position and a second position; in the first position, the vertical distance between the pressing head (32) and the first conveying belt (11) is greater than 0 and less than the vertical distance between the material edge (200) and the first conveying belt (11); in the second position, the vertical distance between the pressing head (32) and the first conveying belt (11) is greater than the vertical distance between the material edge (200) and the first conveying belt (11); and a breaking device (50) arranged at the end of the conveying route, for receiving and breaking the material edge (200) output by the first conveying belt (11). The pressing device (30) comprises a second conveyor (31) arranged above the first conveyor (10) and extending in parallel with the conveying route; the second conveyor (31) is fixed with the pressing head (32) capable of moving in a circulating manner; when the pressing head (32) is located at the outward section of the second conveyor (31), the pressing head (32) is located at the first position and moves synchronously with the material edge (200); when the pressing head (32) is located at the return section of the second conveyor (31), the pressing head (32) is located at the second position. The second conveying belt (311) of the second conveyor (31) is provided with a transversely-through mounting groove (312), and the root of the pressing head (32) is detachably connected to the mounting groove (312); and / or the second conveyor (31) is fixedly connected with a plurality of pressing heads (32) arranged in sequence at equal intervals along the extension direction of the second conveyor (31), so that at least two pressing heads (32) can be simultaneously located at the first position; and / or the head of the pressing head (32) gradually thickens towards the root; and / or the pressing head (32) extends along the transverse direction of the second conveyor (31); and / or the second conveyor (31) extends from the heating section to the cooling section; and / or the end of the second conveyor (31) is arranged in correspondence with the end of the first conveyor (10). The heating device (20) comprises a heating box (21) extending through the conveying route, wherein the heating box (21) is provided with a first heater (22) for heating the internal environment of the heating box (21), and the first conveyor (10) and the pressing device (30) are arranged in the heating box (21). ​ 2. The plastic rim recycling device according to claim 1, characterized in that: ​ 3. The plastic rim recycling device according to claim 2, characterized in that: ​ ​ ​ ​ ​ ​ 4. The plastic rim recycling device method of claim 1, wherein: ​ 5. The plastic rim recycling device according to claim 1, wherein: The first conveyor (10) is provided with a pair of rollers (60) upstream, the pair of rollers (60) includes an upper groove roller (61) and a lower groove roller (62) arranged in an upper and lower manner, a type hole (63) is formed between the roller surfaces of the upper groove roller (61) and the lower groove roller (62) for clamping the material edge (200), the cross-sectional shape of the type hole (63) matches the cross-sectional shape of the material edge (200), and the axis of the type hole (63) is located above the first conveying belt (11) and parallel to the axis of the first conveying belt (11).

6. The plastic rim recycling device according to claim 5, wherein: A plurality of type holes (63) are sequentially arranged between the roller surfaces of the upper groove roller (61) and the lower groove roller (62) in the transverse direction; And / or, the upper groove roller (61) and / or the lower groove roller (62) is connected with a second heater (64) for heating the roller surface to preheat the material edge (200).

7. The plastic rim recycling device according to claim 1, wherein: The surface of the first conveying belt (11) for carrying the material edge (200) is provided with uniformly distributed convex points (111); And / or, the plastic material edge recycling device further comprises a cooling device (40) corresponding to the cooling section, for providing cold energy to cool the material edge (200).

8. The plastic rim recycling device according to claim 1, wherein: The crushing device (50) comprises an outer cylinder (51) provided with a feeding port (511) at the top and a discharging port (512) at the bottom, and a rotary cylinder (52) provided in the outer cylinder (51) and having an inlet (521) at the top and being closed at the bottom, and the peripheral wall of the rotary cylinder (52) is provided with a discharging hole (522); the outer cylinder (51) is provided with a driving device (53) connected to the rotary cylinder (52) for driving the rotary cylinder (52) to rotate to throw the material edge (200) out of the discharging hole (522) to the inner circumferential surface of the cylinder wall of the outer cylinder (51).

9. The plastic rim recycling device according to claim 8, characterized in that: The bottom of the outer cylinder (51) is provided with a conical disc (523) protruding upward from the center; And / or, the outer cylinder (51) is provided with a plurality of protrusions (54) protruding from the inner circumferential surface of the cylinder wall of the outer cylinder (51) and located on the discharging path of the discharging hole (522); And / or, the outer cylinder (51) is provided with a discharging plate (55) inclined to the discharging port (512), and the discharging plate (55) is located below the rotary cylinder (52).

10. A method of recycling plastic trim scrap, characterized by: The plastic material edge recycling device (100) according to any one of claims 1-9 is used to recycle the crushed material edge (200), comprising the following steps: Step S1, using the first conveying belt (11) of the first conveyor (10) to convey the material edge (200) along the conveying route to the heating section; Step S2, using the heating device (20) to heat the material edge (200) passing through the heating section, so that the material edge (200) gradually warms up and reaches a softened state; Step S3, using the pressing device (30), the pressing head (32) is lowered to press the material edge (200) in the softened state to form a transversely penetrating indentation groove (201) on the material edge (200); Step S4, using the crushing device (50) to crush the material edge (200) in the softened state to form a plurality of crushed material edges (200); Step S4, using the first conveyor (10) of the first conveyor belt (11) along the conveying route to convey the material edge (200) formed with the indentation groove (201) to the cooling section and gradually cool it along the way to harden it; Step S5, using the first conveyor (10) of the first conveyor belt (11) along the conveying route to convey the hardened material edge (200) to the end of the conveying route, so that the material edge (200) reaches the crushing device (50); Step S6, using the crushing device (50) to crush the hardened material edge (200), to obtain a plurality of fragments that are brittlely fractured from the indentation groove (201).

Images