Online leftover material recovery processing system for plastic film production line

Abstract

The utility model relates to an on-line leftover material recycling system for a plastic film production line, and belongs to the technical field of leftover material recycling. The utility model discloses an on-line leftover material recycling and processing system for a plastic film production line. The on-line leftover material recycling and processing system comprises a leftover material storage tank, a crusher, a blowing machine, a crushed material storage tank, a melt extruder, a granulator and a controller, a first material level detector is arranged on the crushed material storage tank; a first feeding valve is arranged at an outlet of the crushed material storage tank; the first material level detector is provided with a first material level value, and when the first material level detector detects that the material level of the crushed material storage tank reaches the first material level value, the controller controls the first feeding valve to be opened, so that the crushed materials enter the melt extruder to be subjected to melt extrusion. The on-line leftover material recovery processing system for the plastic film production line can be used for timely recovering leftover materials generated in the production process of plastic films such as label films and the like, so that the utilization value of the leftover materials is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of scrap recycling, in particular to an online recycling and processing system for scraps of a plastic film production line. Background Art

[0002] A large amount of scraps will be generated in the label film production line. These scraps take up a large area and consume production costs, which is an urgent problem to be solved in film production. Therefore, it is necessary to recycle and reuse the scraps generated by the label film production line to improve its utilization value. Utility Model Content

[0003] Based on this, the purpose of the utility model is to provide an online recycling and processing system for scraps of a plastic film production line, which can be used for timely recycling of scraps generated during the production of label films or other plastic films, thereby improving the utilization value of the scraps.

[0004] To achieve the above purpose, the utility model is implemented through the following technical solutions:

[0005] An online recycling and processing system for scraps of a plastic film production line, comprising a scrap storage tank, a crusher, a blower, a crushed material storage tank, a melt extruder, a granulator and a controller;

[0006] The scrap storage tank is used to collect scraps generated by the plastic film production line; the crusher is connected to the outlet of the scrap storage tank, and the crusher is used to crush the scraps into crushed materials; the blower is arranged at the outlet of the crusher, and is used to transfer the crushed materials to the crushed material storage tank; the melt extruder is connected to the outlet of the crushed material storage tank; the granulator is used to granulate the extruded material extruded by the melt extruder;

[0007] Wherein: a first material level detector is arranged on the crushing material storage tank; a first feeding valve is arranged at the outlet of the crushing material storage tank; the first material level detector and the first feeding valve are electrically connected to the controller respectively; the first material level detector is used to detect the material level of the crushing material storage tank and feed back to the controller; the controller can control the switch of the first feeding valve; the first material level detector is set with a first material level value, and when the first material level detector detects that the material level of the crushing material storage tank reaches the first material level value, the controller controls the first feeding valve to open.

[0008] The online recycling system for scraps of a plastic film production line described in the utility model collects the scraps generated in the plastic film production line into the scrap storage tank, and crushes the scraps through the crusher to form crushed materials, and the crushed materials are transmitted to the crushed material storage tank through the blowing machine. When the material level of the crushed materials in the crushed material storage tank reaches the first material level value, the controller controls the first feeding valve to open, so that the crushed materials enter the melt extruder for melt extrusion, and after extrusion, the granulator is used for cooling and granulation. The online recycling system for scraps of a plastic film production line described in the utility model detects the material level by setting the first material level detector on the crushed material storage tank, converts the detected material level signal into an electrical signal and transmits it to the controller, so that the controller controls the switch of the first feeding valve at the outlet of the crushed material storage tank, reduces the operation of the operator, and saves manpower. The online recycling system for scraps of a plastic film production line described in the utility model can be used for the timely recovery of scraps generated in the production process of label film or other plastic films, thereby improving the utilization value of scraps.

[0009] Furthermore, the melt extruder is provided with a heater and a temperature detector; the heater is used to heat the melt extruder; the melt extruder and the temperature detector are electrically connected to the controller respectively; the controller can control the start and stop of the melt extruder; the temperature detector is used to detect the melt extrusion temperature of the melt extruder and feed it back to the controller; the temperature detector is set with a first temperature value, and when the first material level detector detects that the material level of the crushed material storage tank reaches the first material level value, and the temperature detector detects that the melt extrusion temperature of the melt extruder reaches the first temperature value, the controller controls the melt extruder to start, and controls the first feeding valve to open. The utility model further takes into account that the melt extruder usually needs to reach a certain temperature before it can melt-extrude the crushed material. Therefore, before the crushed material storage tank is fed to the melt extruder (that is, before the first feeding valve is opened), the heater provided on the melt extruder needs to be turned on to heat the melt extruder so that its melt extrusion temperature is preheated to the set value (that is, the first temperature value) before feeding. Therefore, before the first feeding valve is opened, the heater is started to preheat the melt extruder. When the first material level detector detects that the material level of the crushed material storage tank has reached a first material level value, and the temperature detector detects that the melt extrusion temperature of the melt extruder has reached a first temperature value, the controller controls the melt extruder to start, and controls the first feeding valve to open, so that the crushed material enters the melt extruder for melt extrusion, thereby improving the smoothness of the melt extrusion.

[0010] As a preferred solution, the heater is electrically connected to the controller, and the controller can control the start and stop of the heater; when the first material level detector detects that the material level of the crushed material storage tank reaches a first material level value, the controller controls the heater to start preheating (heating), and when the melt extrusion temperature of the melt extruder is preheated to a first temperature value, the controller controls the melt extruder to start, and controls the first feeding valve to open. The utility model provides a preferred solution, when the material level of the crushed material storage tank reaches a first material level value, the heater is "triggered" to preheat the melt extruder, and after the preheating is completed (that is, the melt extrusion temperature of the melt extruder reaches the first temperature value), the controller controls the melt extruder to start, and controls the first feeding valve to open, so that the crushed material enters the melt extruder for melt extrusion.

[0011] As another preferred scheme, the heater is electrically connected to the controller, and the controller can control the start and stop of the heater; a second material level detector is arranged on the scrap storage tank; a second feeding valve is arranged at the outlet of the scrap storage tank; the second material level detector and the second feeding valve are electrically connected to the controller respectively; the second material level detector is used to detect the material level of the scrap storage tank and feed back to the controller; the controller can control the switch of the second feeding valve; the second material level detector is set with a second material level value, and when the second material level detector detects that the material level of the scrap storage tank reaches the second material level value, the controller controls the heater to start, and controls the second feeding valve to open. The utility model provides another preferred solution, in which the second material level detector is arranged in the scrap storage tank, and after detecting that the material level of the scrap storage tank reaches the second material level value, the controller controls the heater to start preheating the melt extruder in advance, so that when the first material level detector detects that the material level of the broken material storage tank reaches the first material level value, the melt extrusion temperature of the melt extruder has been preheated to a certain temperature value, or even reaches the first temperature value, thereby saving the preheating time consumed in the above solution "that is, when the first material level detector detects that the material level of the broken material storage tank reaches the first material level value, "triggering" the heater to preheat", thereby improving the overall working efficiency of the online recycling and processing system for scraps of the plastic film production line.

[0012] Furthermore, a pressure sensor is also provided at the die head of the melt extruder, and the pressure sensor is electrically connected to the controller; the pressure sensor is used to detect the extrusion pressure at the die head of the melt extruder and feed it back to the controller; the pressure sensor is set with a first pressure value, and when the pressure sensor detects that the extrusion pressure at the die head of the melt extruder is reduced to the first pressure value, the controller controls the melt extruder and the heater to stop working. It is known to those skilled in the art that when there is material in the melt extruder, the extrusion pressure at its die head is usually high; when the material in the melt extruder is emptied, the extrusion pressure at its die head is usually reduced to a certain pressure value, and the pressure value is set as the first pressure value. When the extrusion pressure at the die head of the melt extruder is detected to be reduced to the first pressure value, it indicates that the material in the melt extruder has been emptied, and the melt extruder and the heater can be controlled to stop working by the controller.

[0013] Furthermore, the crusher is electrically connected to the controller, and the controller can control the start and stop of the crusher; when the second material level detector detects that the material level of the scrap material storage tank reaches a second material level value, the controller also controls the crusher to start.

[0014] Furthermore, the blowing machine is electrically connected to the controller, and the controller can control the start and stop of the blowing machine; when the second material level detector detects that the material level of the scrap material storage tank reaches a second material level value, the controller also controls the blowing machine to start.

[0015] Furthermore, the granulator is electrically connected to the controller, and the controller can control the start and stop of the granulator. Preferably, when the first material level detector detects that the material level of the scrap material storage tank reaches a first material level value, the controller also controls the granulator to start.

[0016] Furthermore, the online recycling system for scraps of the plastic film production line also includes a first conveying device, which is arranged between the plastic film production line and the scrap storage tank, and is used to convey the scraps generated by the plastic film production line to the scrap storage tank. By setting the first conveying device, the scraps generated by the plastic film production line are conveyed to the scrap storage tank for collection.

[0017] Furthermore, the online recycling system for scraps of the plastic film production line also includes a second conveying device, which is arranged between the granulator and the plastic film production line and is used to convey the granulated material obtained by the granulator to the plastic film production line. By providing the second conveying device, the granulated material is used in the original plastic film production line, thereby improving the use value of the scraps. In other schemes, the granulated material can also be used for other purposes.

[0018] In order to better understand and implement the present invention, the present invention is described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a structural schematic diagram of an online recycling system for scraps of a plastic film production line of the utility model;

[0020] Figure 2 for Figure 1 main view. DETAILED DESCRIPTION

[0021] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0022] In addition, the terms first, second, third, etc. in the specification and claims are only used for the purpose of describing the same technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated, nor necessarily describing the order or time sequence. The terms are interchangeable where appropriate. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0023] Similarly, the term "connection" is also used in the specification and claims, which should not be interpreted as limited to direct connection. Therefore, the expression "device A is connected to device B" should not be limited to the device A being directly connected to device B in the device or system, which means that there is a path between device A and device B, which may be a path including other devices or tools.

[0024] Example 1

[0025] A large amount of scraps will be generated in the label film production line. These scraps occupy a large area and consume production costs, which is an urgent problem to be solved in the label film production process. Therefore, this embodiment designs an online recycling and processing system for the scraps generated by the label film production line to recycle the scraps and improve their utilization value. It should be understood by those skilled in the art that the online recycling and processing system should not be limited to recycling the scraps generated by the label film production line, but can also be applied to recycling the scraps generated by other plastic film production lines.

[0026] This embodiment provides an online recycling system for scraps from a plastic film (label film) production line. Figure 1 and Figure 2 , including a scrap material storage tank 1, a crusher 2, a blowing machine 3, a crushed material storage tank 4, a melt extruder 5, a granulator (not shown) and a controller (not shown).

[0027] The scrap storage tank 1 is used to collect the scraps generated by the plastic film (label film) production line; the crusher 2 is connected to the outlet of the scrap storage tank 1, and the crusher 2 is used to crush the scraps into crushed materials; the blower 3 is connected to the outlet of the crusher 2 and the inlet of the crushed material storage tank 4 through pipelines, respectively, and is used to transfer the crushed materials to the crushed material storage tank 4; the melt extruder 5 is connected to the outlet of the crushed material storage tank 4; the granulator (not shown) is arranged at the end of the melt extruder 5, and is used to cool and granulate the extruded material extruded by the melt extruder 5.

[0028] In this embodiment, a first material level detector 41 is provided on the crushing material storage tank 4; a first feeding valve 42 is provided at the outlet of the crushing material storage tank 4; the first material level detector 41 and the first feeding valve 42 are electrically connected to the controller respectively; the first material level detector 41 is used to detect the material level of the crushing material in the crushing material storage tank 4 and feed back to the controller; the controller can control the switch of the first feeding valve 42; the first material level detector 41 is set with a first material level value. When the first material level detector 41 detects that the material level of the crushing material storage tank 4 reaches the first material level value, the controller controls the first feeding valve 42 to open, so that the crushing material enters the melt extruder 5 for melt extrusion.

[0029] The online recycling and processing system for scraps of the plastic film (label film) production line of the present embodiment is used for recycling and processing scraps; the scraps generated in the plastic film (label film) production line are collected into a scrap storage tank 1, and the scraps are crushed by a crusher 2 to form crushed materials, and the crushed materials are transmitted to the crushed material storage tank 4 by a blower 3. When the material level of the crushed materials in the crushed material storage tank 4 reaches a first material level value, the first feeding valve 42 is controlled by the controller to open, so that the crushed materials enter the melt extruder 5 for melt extrusion, and are cooled and granulated by a granulator after extrusion. In the present embodiment, the first material level detector 41 is set on the crushed material storage tank 4 to detect the material level, and the detected material level signal is converted into an electrical signal and transmitted to the controller, so that the controller controls the opening of the first feeding valve 42 at the outlet of the crushed material storage tank 4, thereby reducing the operation of the operator and saving manpower.

[0030] In this embodiment, the first material level value is set to 1 / 3 of the capacity of the crushed material storage tank 4. That is, when the first material level detector 41 detects that the crushed material storage tank 4 reaches 1 / 3 of the material level, the controller controls the first feeding valve 42 to open, so that the crushed material enters the melt extruder 5 for melt extrusion. In other embodiments, those skilled in the art can also set the first material level value according to actual conditions, such as calculating according to height, or selecting other values ​​or value ranges, such as 1 / 2, 2 / 3, etc.

[0031] This embodiment further takes into account that the melt extruder 5 usually needs to reach a certain temperature before it can smoothly melt-extrude the crushed material. Therefore, before the crushed material storage tank 4 is fed into the melt extruder 5 (i.e., before the first feeding valve 42 is opened), the melt extrusion temperature of the melt extruder 5 needs to be preheated (heated) to a certain temperature setting value before feeding. Therefore, in this embodiment, a heater 51 and a temperature detector 52 are provided on the melt extruder 5; the heater 51 is used to heat the melt extruder 5; the melt extruder 5 and the temperature detector 52 are respectively electrically connected to the controller; the controller can control the start and stop of the melt extruder 5; the temperature detector 52 is used to detect the melt extrusion temperature of the melt extruder 5 and feed it back to the controller; the temperature detector 52 is set with a first temperature value. When the first material level detector 41 detects that the material level of the crushed material storage tank 4 reaches the first material level value, and the temperature detector 52 detects that the melt extrusion temperature of the melt extruder 5 reaches the first temperature value, the controller controls the melt extruder 5 to start, and controls the first feeding valve 42 to open, so that the crushed material enters the melt extruder 5 for melt extrusion. Therefore, before the first feeding valve 42 is opened, the heater 51 needs to be started to preheat the melt extruder 5 so that its melt extrusion temperature is preheated to the first temperature value, so as to facilitate smooth melt extrusion after feeding.

[0032] In this embodiment, the first temperature value is 255° C. In other embodiments, those skilled in the art may also adjust the specific setting value or range value of the first temperature value according to actual conditions and the specific composition of the scraps.

[0033] In order to facilitate the start of the heater 51 to preheat the melt extruder 5, the overall working efficiency of the online scrap recycling and processing system of the entire plastic film (label film) production line is improved. In this embodiment, the heater 51 is electrically connected to the controller, and the controller can control the start and stop of the heater 51. The scrap storage tank 1 is provided with a second material level detector 11; the outlet of the scrap storage tank 1 is provided with a second feeding valve 12; the second material level detector 11 and the second feeding valve 12 are electrically connected to the controller respectively; the second material level detector 11 is used to detect the material level of the scrap storage tank 1 and feed back to the controller; the controller can control the switch of the second feeding valve 12; the second material level detector 11 is set with a second material level value. When the second material level detector 11 detects that the material level of the scrap storage tank 1 reaches the second material level value, the controller controls the heater 51 to start preheating the melt extruder 5 and controls the second feeding valve 12 to open. When the first material level detector 41 detects that the material level of the crushed material storage tank 4 has reached the first material level value, and the temperature detector 52 detects that the melt extrusion temperature of the melt extruder 5 has reached the first temperature value, the controller controls the melt extruder 5 to start, and controls the first feeding valve 42 to open, so that the crushed material enters the melt extruder 5 for melt extrusion. In this way, when there is a lot of material in the scrap storage tank 1 (reaching the second material level value), the heater 51 is started in advance to preheat the melt extruder 5, and when the first material level detector 41 detects that the material level of the crushed material storage tank 4 has reached the first material level value, the melt extrusion temperature of the melt extruder 5 has been preheated to a higher temperature value, even reaching the first temperature value, saving preheating time and improving the overall work efficiency of the online scrap recycling and processing system of the plastic film (label film) production line.

[0034] In this embodiment, the second material level value is set to 1 / 3 of the capacity of the scrap storage tank 1. In other embodiments, those skilled in the art may also set the second material level value according to actual conditions, such as by calculating according to height, or selecting other values ​​or value ranges, such as 1 / 2, 2 / 3, etc.

[0035] In other embodiments, after the first material level detector 41 detects that the material level of the crushed material storage tank 4 reaches the first material level value, the heater 51 is started to preheat the melt extruder 5. The heater 51 is electrically connected to the controller, and the controller controls the start and stop of the heater 51; when the first material level detector 41 detects that the material level of the crushed material storage tank 4 reaches the first material level value, the controller controls the heater 51 to start preheating the melt extruder 5, and when the melt extrusion temperature of the melt extruder 5 preheated to the first temperature value, the controller controls the melt extruder 5 to start, and controls the first feeding valve 42 to open, so that the crushed material enters the melt extruder 5 for melt extrusion.

[0036] In this embodiment, a pressure sensor 53 is also provided at the die head of the melt extruder 5, and the pressure sensor 53 is electrically connected to the controller; the pressure sensor 53 is used to detect the extrusion pressure at the die head of the melt extruder 5 and feed it back to the controller; the pressure sensor 5 is set with a first pressure value, and when the pressure sensor 53 detects that the extrusion pressure at the die head of the melt extruder 5 is reduced to the first pressure value, the controller controls the first feeding valve 42 to close, and controls the melt extruder 5 and the heater 51 to stop working. When there is material in the melt extruder 5, the extrusion pressure at its die head is usually high; when the material in the melt extruder 5 is emptied, the extrusion pressure at its die head is usually reduced to a certain pressure value, which is set as the first pressure value. When the extrusion pressure at the die head of the melt extruder 5 is detected by the pressure sensor 53 to be reduced to the first pressure value, it indicates that the material in the melt extruder 5 has been emptied, and the controller controls the melt extruder 5 and the heater 51 to stop working. In other embodiments, when the first material level detector 41 detects that the material level of the crushing material storage tank 4 drops to 0, the controller controls the first feeding valve 42 to close, and then controls the melt extruder 5 and the heater 51 to stop working.

[0037] In this embodiment, the first pressure value is set to 10 MPa. In other embodiments, those skilled in the art may also adjust the specific setting value of the first pressure value according to actual conditions.

[0038] In this embodiment, the crusher 2 and the blower 3 are electrically connected to the controller, respectively, and the controller can control the start and stop of the crusher 2 and the blower 3 respectively; when the second material level detector 11 detects that the material level of the scrap storage tank 1 reaches the second material level value, the controller also controls the crusher 2 and the blower 3 to start. As a preferred implementation scheme of this embodiment, when the second material level detector 11 detects that the material level of the scrap storage tank 1 reaches the second material level value, the controller first controls the blower 3 to start, and after a delay of 10 seconds (to blow the pipeline clear), the controller controls the crusher 2 to start and controls the second feeding valve 12 to open, so that the crusher 2 crushes the scrap to form crushed material, and transports it to the crushed material storage tank 4 under the action of the blower 3. As the material level of the scrap storage tank 1 decreases, when the second material level detector 11 detects that the material level of the scrap storage tank 1 is 0, the controller also controls the crusher 2 and the blower 3 to stop. As a preferred implementation scheme of this embodiment, when the second material level detector 11 detects that the material level of the scrap storage tank 1 drops to 0, the controller controls the second feeding valve 12 to close, controls the crusher 2 to stop working, and delays for 30 seconds (to ensure that the scraps in the pipeline are blown clear), and then controls the blowing machine 3 to stop.

[0039] In this embodiment, the granulator is electrically connected to the controller, and the controller can control the start and stop of the granulator; when the first material level detector detects that the material level of the scrap storage tank 1 reaches the first material level value, and the temperature detector 52 detects that the melt extrusion temperature of the melt extruder 5 reaches the first temperature value, the controller also controls the granulator to start.

[0040] In the present embodiment, the plastic film (label film) production line scrap online recycling system also includes a first conveying device (not shown) and a second conveying device (not shown). The first conveying device is arranged between the plastic film (label film) production line and the scrap storage tank 1, and is used to convey the scrap generated by the plastic film (label film) production line to the scrap storage tank 1. By setting the first conveying device, the scrap generated by the plastic film (label film) production line is sent to the scrap storage tank 1 for collection. The second conveying device is arranged between the granulator and the plastic film (label film) production line, and is used to convey the granulated material obtained by the granulator to the plastic film (label film) production line. By setting the second conveying device, the granulated material obtained by the granulator is used in the original plastic film (label film) production line to improve the use value of the scrap. In other embodiments, the granulated material obtained by the granulator can also be used for other purposes. The first conveying device and the second conveying device can be selected by those skilled in the art according to actual needs, such as conveyor belts, conveying pipelines, etc., which will not be repeated here.

[0041] The online recycling system for scraps of the plastic film (label film) production line of this embodiment has the following specific working process:

[0042] The scraps produced by the plastic film (label film) production line are conveyed to the scrap storage tank 1 by the first conveying device; when the second material level detector 11 detects that the material level of the scraps in the scrap storage tank 1 reaches 1 / 3 material level (second material level value), the controller controls the heater 51 to heat the melt extruder 5; at the same time, the controller controls the blowing machine 3 to start running and delays for 10 seconds (to blow the pipeline clear), and then the controller controls the crusher 2 to start running and controls the second feeding valve 12 to open, so that the crushed material is conveyed to the crushed material storage tank;

[0043] When the first material level detector 41 detects that the material level of the crushed material storage tank 4 reaches 1 / 3 of the material level (the first material level value), and the temperature detector 52 detects that the melt extrusion temperature of the melt extruder 5 reaches the first temperature value, the controller controls the melt extruder 5 to start, controls the first feeding valve 42 to open, and controls the granulator to start, so that the crushed material enters the melt extruder 5 for melt extrusion to form a thin strip of extruded material, which is cooled into a crystal shape, and then passes through the granulator to be cut into plastic particles, and the plastic particles are transported to the plastic film (label film) production line for re-application through the second conveying device;

[0044] When the second material level detector 11 detects that the material level of the scrap storage tank 1 drops to 0, the controller controls the second feeding valve 12 to close, and controls the crusher 2 to stop working, delaying 30 seconds (to ensure that the scraps in the pipeline are blown clear), and then controls the blowing machine 3 to stop working;

[0045] When the pressure sensor 53 detects that the extrusion pressure at the die head of the melt extruder 5 drops to 10 MPa (first pressure value), the controller controls the first feed valve 42 to close, and controls the melt extruder 5 and the heater 51 to stop working; finally, the controller controls other equipment such as the granulator to stop working.

[0046] It should be noted in the present application that the online recycling and processing system for the plastic film (label film) production line of the present embodiment can also be used to recycle scraps generated by other plastic film production lines.

[0047] Compared with the prior art, the online recycling and processing system for scraps of plastic film production lines described in the utility model recycles and processes the scraps generated in the plastic film production line to improve the utilization value of the scraps; and by setting corresponding detectors in conjunction with the controller, relatively intelligent and relatively automatic recycling of scraps is achieved.

[0048] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, and the utility model is also intended to include these modifications and modifications.

Claims

1. An online recycling system for scraps of plastic film production lines, characterized by: Including scrap storage tank, crusher, blower, crushed material storage tank, melt extruder, granulator and controller; The scrap material storage tank is used to collect the scrap materials generated by the plastic film production line; the crusher is connected to the outlet of the scrap material storage tank and is used to crush the scrap materials into crushed materials; the blower is used to transfer the crushed materials to the crushed material storage tank; the melt extruder is connected to the outlet of the crushed material storage tank; the granulator is used to granulate the extruded material extruded by the melt extruder; Wherein: a first material level detector is arranged on the crushing material storage tank; a first feeding valve is arranged at the outlet of the crushing material storage tank; the first material level detector and the first feeding valve are electrically connected to the controller respectively; the first material level detector is used to detect the material level of the crushing material storage tank and feed back to the controller; the controller can control the switch of the first feeding valve; the first material level detector is set with a first material level value, and when the first material level detector detects that the material level of the crushing material storage tank reaches the first material level value, the controller controls the first feeding valve to open.

2. The online recycling system for scraps of plastic film production line according to claim 1 is characterized by: The melt extruder is provided with a heater and a temperature detector; the heater is used to heat the melt extruder; the melt extruder and the temperature detector are electrically connected to the controller respectively; the controller can control the start and stop of the melt extruder; the temperature detector is used to detect the melt extrusion temperature of the melt extruder and feed back to the controller; the temperature detector is set with a first temperature value, when the first material level detector detects that the material level of the crushing material storage tank reaches the first material level value, and the temperature detector detects that the melt extrusion temperature of the melt extruder reaches the first temperature value, the controller controls the melt extruder to start, and controls the first feeding valve to open.

3. The online recycling system for scraps of plastic film production line according to claim 2 is characterized by: The heater is electrically connected to the controller, and the controller can control the start and stop of the heater; when the first material level detector detects that the material level of the crushing material storage tank reaches a first material level value, the controller controls the heater to start preheating, and when the melt extrusion temperature of the melt extruder preheated to a first temperature value, the controller controls the melt extruder to start and controls the first feeding valve to open.

4. The online recycling system for scraps of plastic film production line according to claim 2 is characterized by: The heater is electrically connected to the controller, and the controller can control the start and stop of the heater; a second material level detector is arranged on the scrap storage tank; a second feeding valve is arranged at the outlet of the scrap storage tank; the second material level detector and the second feeding valve are electrically connected to the controller respectively; the second material level detector is used to detect the material level of the scrap storage tank and feed back to the controller; the controller can control the switch of the second feeding valve; the second material level detector is set with a second material level value, and when the second material level detector detects that the material level of the scrap storage tank reaches the second material level value, the controller controls the heater to start, and controls the second feeding valve to open.

5. The online recycling system for scraps of a plastic film production line according to claim 3 or 4, characterized in that: A pressure sensor is also provided at the die head of the melt extruder, and the pressure sensor is electrically connected to the controller; the pressure sensor is used to detect the extrusion pressure at the die head of the melt extruder and feed back to the controller; the pressure sensor is set with a first pressure value, and when the pressure sensor detects that the extrusion pressure at the die head of the melt extruder is reduced to the first pressure value, the controller controls the melt extruder and the heater to stop working.

6. The online recycling system for scraps of plastic film production line according to claim 4 is characterized by: The crusher is electrically connected to the controller, and the controller can control the start and stop of the crusher; when the second material level detector detects that the material level of the scrap material storage tank reaches a second material level value, the controller also controls the crusher to start.

7. The online recycling system for scraps of plastic film production line according to claim 4 is characterized by: The blowing machine is electrically connected to the controller, and the controller can control the start and stop of the blowing machine; when the second material level detector detects that the material level of the scrap material storage tank reaches a second material level value, the controller also controls the blowing machine to start.

8. The online recycling system for scraps of a plastic film production line according to any one of claims 2 to 4, characterized in that: The granulator is electrically connected to the controller, and the controller can control the start and stop of the granulator.

9. The online recycling system for scraps of plastic film production line according to claim 1 is characterized by: It also includes a first conveying device, which is arranged between the plastic film production line and the scrap material storage tank and is used to convey the scrap materials generated by the plastic film production line to the scrap material storage tank.

10. The online recycling system for scraps of plastic film production line according to claim 1, characterized in that: The online recycling system for scraps of plastic film production lines also includes a second conveying device, which is arranged between the granulator and the plastic film production line and is used to convey the granulated material obtained by the granulator to the plastic film production line.

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