Thermal decomposition equipment for waste plastics

Abstract

The utility model provides waste plastic thermal decomposition equipment which comprises a box body, a treatment tank is arranged in the box body, a crushing assembly is arranged above the treatment tank and is used for performing two-stage crushing on waste plastic, a feeding hopper is fixedly arranged at the top of the box body, a motor is mounted at the top of the box body, and the crushing assembly is used for performing two-stage crushing on the waste plastic. The output end of the motor is fixedly connected with a rotating rod, the outer side of the rotating rod is fixedly connected with a stirring rod, a heater is arranged on the outer side of the treatment tank, and the bottom of the treatment tank communicates with a discharging pipe. After entering the crushing tank, the waste plastic fed from the feeding hopper is crushed more effectively by the crushing assembly in a two-stage crushing and cutting manner and discharged downwards into the treatment tank, and the waste plastic is stirred by the stirring rods which are uniformly arranged in the circumferential direction to rotate, so that the waste plastic is crushed more effectively in the rotating process. The crushed waste plastic is fully turned over and makes contact with the heated treatment tank, heating is uniform, the thermal decomposition rate of the waste plastic is higher, and the waste plastic is more fully decomposed.

Description

Technical Field

[0001] This utility model relates to the technical field of plastic recycling equipment, and in particular to a thermal decomposition device for waste plastics. Background Technology

[0002] With the increasing consumption of plastic products, the amount of waste plastic is also increasing. Plastic recycling refers to the process of recycling waste plastics to achieve the goal of turning waste into treasure. my country's waste plastics mainly include plastic film, plastic filaments and woven products, foam plastics, plastic packaging boxes and containers, daily plastic products, plastic bags and agricultural mulch film, etc.

[0003] Patent document CN216299839U discloses a waste plastic melting device. The device involves pouring waste plastic into a hopper, where two crushing rollers drive the plastic to crush it. The crushed plastic falls through a filter screen onto a baffle plate, where a burner melts it. The filter screen acts as a filter, and as the crushing rollers break the plastic, the screen acts as a stop, preventing larger pieces from being crushed further until they fit the filter screen. This process breaks the plastic to a suitable size, and the burner then melts it. In implementing this technical solution, the inventors discovered at least the following problems in the prior art:

[0004] In actual use, the above-mentioned device, due to the lack of further crushing of plastic particles on the filter screen, exacerbates the clogging problem of the crushed plastic, thus affecting the overall efficiency of the thermal decomposition and recovery equipment for plastic.

[0005] Therefore, it is necessary to provide a new thermal decomposition and recycling device for waste plastics to solve the above-mentioned technical problems. Utility Model Content

[0006] The purpose of this invention is to provide a thermal decomposition device for waste plastics to solve the problems mentioned in the background art.

[0007] This utility model provides a thermal decomposition device for waste plastics, including a box body, a processing tank inside the box body, a crushing component above the processing tank, the crushing component being used for two-stage crushing of waste plastics, a feeding hopper fixedly installed on the top of the box body, a motor installed on the top of the box body, a rotating rod fixedly connected to the output end of the motor, a stirring rod fixedly connected to the outside of the rotating rod, a heater installed on the outside of the processing tank, and a discharge pipe connected to the bottom of the processing tank.

[0008] As a waste plastic pyrolysis device provided by this utility model, preferably, the crushing component includes a crushing tank disposed on the upper part of the processing tank, a lower discharge port is provided at the bottom center of the crushing tank, and a rotating rod passes through the lower discharge port. Crushing blades are fixedly connected to the outer side of the rotating rod, and a rotating cover is disposed on the rotating rod and below the crushing blades. A first cutting plate is uniformly disposed circumferentially at the bottom of the rotating cover, and a second cutting plate is uniformly disposed circumferentially at the inner bottom of the crushing tank. The first cutting plate and the second cutting plate slide in staggered contact.

[0009] As a waste plastic pyrolysis device provided by this utility model, preferably, a control valve is provided on the outside of the discharge pipe, and a fixed leg is fixedly connected to the bottom of the box.

[0010] In this utility model, a thermal decomposition device for waste plastics is preferably provided, wherein the lower end of the rotating rod is provided with a scraper, and the scraper slides in contact with the inner bottom of the treatment tank.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] This waste plastic pyrolysis and recycling equipment involves feeding waste plastic into a crushing tank via a hopper. The crushing components then use a two-stage crushing and cutting method to more effectively crush the waste plastic before it is discharged into a processing tank. The crushed waste plastic is then rotated by a circumferentially evenly arranged stirring rod. During the rotation process, the crushed waste plastic is fully agitated and comes into contact with the heated processing tank, resulting in uniform heating and a higher and more complete pyrolysis rate.

[0013] The two-stage crushing method is less likely to cause blockage in the crushing area compared to the sieve method, and it can crush waste plastics to a higher degree, thereby improving the overall processing efficiency of the thermal decomposition and recycling equipment. Attached Figure Description

[0014] Figure 1 This is a front view schematic diagram of the present invention;

[0015] Figure 2 for Figure 1 A partial cross-sectional diagram;

[0016] Figure 3 This is a schematic diagram showing the distribution of the cutting plate in this utility model;

[0017] Figure 4 This is a schematic diagram showing the two distributions of the cutting plate in this utility model;

[0018] Figure 5 for Figure 2 A magnified structural diagram at point a.

[0019] The following are the labels in the diagram: 1. Box body; 2. Processing tank; 3. Crushing assembly; 31. Crushing tank; 32. Crushing blade; 33. Rotary cover; 34. Cutting plate one; 35. Cutting plate two; 4. Feeding hopper; 5. Motor; 6. Rotating rod; 7. Stirring rod; 8. Heater; 9. Discharge pipe; 10. Control valve; 11. Fixed leg; 701 scraper. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Please refer to the following: Figures 1-2 A pyrolysis device for waste plastics, comprising a housing 1.

[0022] In the specific implementation process, such as Figure 1 and Figure 2 As shown, a processing tank 2 is bolted inside the housing 1. A crushing assembly 3 is installed above the processing tank 2. The crushing assembly is used for two-stage crushing of waste plastic. Feed hoppers 4 are bolted to both sides of the top of the housing 1. The feed hoppers 4 are connected to the top sides of the crushing tank 31. A motor 5 is bolted to the center of the top of the housing 1. The motor 5 is an explosion-proof and heat-resistant motor. The output end flange of the motor 5 is connected to a rotating rod 6. A stirring rod 7 is bolted to the lower outer side of the rotating rod 6. The stirring rod 7 is located inside the processing tank 2. A heater 8 is fixed to the outside of the processing tank 2 with clamps. The heater 8 is a coil heater. The power cord of the heater 8 passes through the housing 1 and is connected to the power output of an external temperature controller. The power input of the external temperature controller is connected to an external power source via a cable. In actual operation, the heating temperature is set according to the melting temperature of the plastic itself. The set heating temperature must be 20°C higher than the melting temperature of the plastic itself. Its coil is tightly attached to the outer wall of the processing tank 2 and is used to heat and melt the crushed plastic inside the processing tank 2. The bottom of the processing tank 2 is sealed with a discharge pipe 9.

[0023] The waste plastic is crushed in two stages by the crushing component and then discharged into the processing tank 2. The processing tank 2 is heated by the external heater 8. Driven by the motor 5, the rotating rod 6 and the stirring rod 7 arranged circumferentially at the bottom rotate. During the rotation, the crushed waste plastic is fully tumbled and comes into contact with the heated processing tank 2, resulting in uniform heating and a high melting rate.

[0024] See Figure 2 , Figure 3 , Figure 4 and Figure 5The crushing assembly 3 includes a crushing tank 31 with a flange fixed to the upper part of the processing tank 2. The bottom center of the crushing tank 31 is provided with a lower discharge port, and the rotating rod 6 passes through the lower discharge port. The upper outer side of the rotating rod 6 is uniformly bolted with crushing blades 32. The rotating rod 6 is bolted with a rotating cover 33 at the lower part of the crushing blades 32. The rotating cover 33 is a round cover, with a conical upper part and an arc-shaped round cover structure at the lower part. The gap between the bottom of the rotating cover 33 and the inner bottom of the crushing tank 31 is 3 cm. The bottom of the rotating cover 33 is uniformly welded with a cutting plate 34, and the inner bottom of the crushing tank 31 is uniformly welded with a cutting plate 35. The cutting plate 34 and the cutting plate 35 slide in staggered contact, and both ends of the cutting plate 34 and the cutting plate 35 are provided with oblique cutting blades.

[0025] After the waste plastic added by the feeding hopper 4 enters the crushing tank 31, it is driven by the motor 5. The crushing blades 32 first crush the waste plastic laterally. The crushed waste plastic is obliquely guided from the top of the shroud 33 to the gap between the shroud 33 and the crushing tank 31. It is then further crushed by the interlaced extrusion and cutting of the evenly arranged cutting plates 34 and 35, and discharged through the bottom of the crushing tank 31.

[0026] See Figure 1 and Figure 2 A control valve 10 is screwed onto the outside of the discharge pipe 9. The control valve 10 is a shut-off valve for molten plastic discharge. Fixed legs 11 are welded to the four sides of the bottom of the box body 1.

[0027] It should be noted that the waste plastic processed through two-stage crushing and cutting facilitates the improvement of the subsequent thermal decomposition efficiency of the plastic.

[0028] By setting control valve 10 to control the on / off of the molten plastic discharged from the discharge pipe 9, the control valve 10 can be closed during the heating process, and opened after the heating time is reached, so that the molten plastic can be discharged.

[0029] See Figure 2 Scraper 701 is bolted to both sides of the lower end of the rotating rod 6, and scraper 701 slides in contact with the inner bottom of the treatment tank 2.

[0030] As the rotating rod 6 rotates, the scraper 701 rotates accordingly. During this process, the bottom of the processing tank 2 is scraped, and some of the plastic that has not been fully melted is scraped up and mixed into the upper molten plastic for heating, thereby making the waste plastic in the lower part more effectively thermally decomposed.

[0031] The working principle of the pyrolysis device for waste plastics provided by this utility model is as follows:

[0032] After the waste plastic added by the feeding hopper 4 enters the crushing tank 31, the crushing component 3 uses a two-stage crushing and cutting method to more effectively crush the waste plastic and discharge it into the treatment tank 2. After the circumferentially evenly arranged stirring rod 7 rotates, the crushed waste plastic is fully tumbled and comes into contact with the heated treatment tank 2 during the rotation process, so that it is heated evenly and the thermal decomposition rate of the waste plastic is higher and more complete.

[0033] It should be noted that the motor and heater are existing equipment, which can be known to those skilled in the art through technical manuals or conventional experimental methods. The content of this utility model does not involve any improvement to the internal structure and method, so it will not be described in detail.

[0034] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A pyrolysis device for waste plastics, characterized in that, The device includes a housing (1), inside which is a processing tank (2), and above the processing tank (2) is a crushing component (3), which is used to crush waste plastic in two stages. A feeding hopper (4) is fixedly installed on the top of the housing (1), and a motor (5) is installed on the top of the housing (1). A rotating rod (6) is fixedly connected to the output end of the motor (5), and a stirring rod (7) is fixedly connected to the outside of the rotating rod (6). A heater (8) is installed on the outside of the processing tank (2), and a discharge pipe (9) is connected to the bottom of the processing tank (2).

2. The thermal decomposition equipment for waste plastics according to claim 1, characterized in that, The crushing assembly (3) includes a crushing tank (31) disposed on the upper part of the processing tank (2). The bottom center of the crushing tank (31) is provided with a lower discharge port, and a rotating rod (6) passes through the lower discharge port. A crushing blade (32) is fixedly connected to the outside of the rotating rod (6). A rotating cover (33) is provided on the rotating rod (6) and located below the crushing blade (32). A cutting plate (34) is uniformly arranged in a circumferential direction at the bottom of the rotating cover (33). A cutting plate (35) is uniformly arranged in a circumferential direction at the inner bottom of the crushing tank (31). The cutting plate (34) and the cutting plate (35) slide in staggered contact.

3. The thermal decomposition equipment for waste plastics according to claim 1, characterized in that, A control valve (10) is provided on the outside of the discharge pipe (9), and a fixed leg (11) is fixedly connected to the bottom of the box (1).

4. The thermal decomposition equipment for waste plastics according to claim 1, characterized in that, The lower end of the rotating rod (6) is provided with a scraper (701), which slides in contact with the inner bottom of the treatment tank (2).

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