Polyolefin material recovery device

Abstract

The invention relates to the technical field of recovery equipment, and discloses a polyolefin material recovery device which comprises a hot-melt extrusion connector installed on a melting recovery device, a temperature control mechanism is arranged at the end of the hot-melt extrusion connector, and a self-adaptive valve plate for controlling the temperature control mechanism to open and close along with the temperature is arranged in the middle of the temperature control mechanism. The self-adaptive valve plate can be opened after reaching the specified temperature, a cut-off mechanism used for cutting off waste materials at the inner end of the hot-melt extrusion connector is embedded in the temperature control mechanism, and end material residual pollution in the extrusion process can be effectively reduced and recycled.

Description

Technical Field

[0001] The invention relates to the technical field of recycling equipment, and in particular to a polyolefin material recycling device. Background Art

[0002] Polyolefin is a large variety of polymer materials, accounting for 60% of the total plastics. Its products are mainly used in plastic films, packaging materials, electrical accessories, various pipes and daily necessities. Agricultural film is a product with a large application volume among polyolefins: it accounts for 50% of polyethylene products and 20% of polypropylene products. Taking ground film as an example, linear low-density polyethylene is mainly used. Due to the characteristics of linear low-density polyethylene, high strength, good resistance to environmental stress cracking, good heat and low temperature resistance, outstanding film puncture resistance, large elongation of the melt during processing, and excellent tensile properties, it can be made into micro-enzyme film, functional film, multi-layer co-extruded film, etc., which are suitable for various needs in agricultural production.

[0003] Chinese patent publication number CN1056622C discloses a product recovery method for a high molecular weight amorphous poly alpha-olefin, wherein the amount of water used in the method is significantly reduced, and the intermediate stage of storing and drying block-shaped polyolefin is eliminated. The polyolefin produced in the reactor is heated in a kneader to remove any unreacted monomer. Then, the liquid polyolefin material is directly transferred to an extruder to further remove any unreacted monomer and catalyst. Finally, a granulator is used to granulate the polyolefin material.

[0004] In the hot melt extrusion process, the existing polyolefin recovery devices have a conical structure for the extrusion port and an open end. The opening part dissipates heat faster, resulting in a large difference between the temperature of the extrusion port and the temperature in the extrusion cavity, which leads to a poor initial material qualification rate.

[0005] Therefore, it is necessary to provide a polyolefin material recovery device to solve the above technical problems. Summary of the invention

[0006] The object of the present invention is to provide a polyolefin material recovery device to solve the above technical problems.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a polyolefin material recovery device, comprising a hot melt extrusion joint installed on a melt recovery device, a temperature control mechanism is provided at the end of the hot melt extrusion joint, an adaptive valve plate is provided in the middle of the temperature control mechanism, and the adaptive valve plate can be opened after reaching a specified temperature, and a cutting mechanism for cutting off the waste material at the end of the hot melt extrusion joint is embedded in the temperature control mechanism.

[0008] Furthermore, the end of the hot-melt extrusion joint has a tapered structure.

[0009] During use, the temperature of the end of the hot-melt extrusion joint is sensed by a temperature control mechanism. When the temperature reaches the appropriate discharge temperature, the adaptive valve plate can be controlled to open for discharge, thereby effectively maintaining the stability of the discharge temperature of the hot-melt extrusion joint and avoiding the problem of temperature difference caused by excessive heat dissipation at the discharge port due to the conical design of the end of the hot-melt extrusion joint. A cutting mechanism is also provided inside the hot-melt extrusion joint. After the extrusion of the hot-melt extrusion joint is completed, material will remain at the end of the hot-melt extrusion joint, and the material in this area will be quickly cooled due to the temperature to form defective products, thereby contaminating the subsequent extruded material, and it is also easy to cause blockage of the hot-melt extrusion joint after cooling and solidification.

[0010] As a further solution of the present aspect, a control cavity and a bonding cavity are provided inside the temperature control mechanism, the bonding cavity is bonded to the end of the hot-melt extrusion joint, and the control cavity is communicated with the bonding cavity.

[0011] As a further solution of the present aspect, the adaptive valve plate includes a temperature control slide plate, a drive plate and a closing valve plate. The temperature control slide plate is elastically connected to the interior of the control chamber, the drive plate is fixedly connected to the side end surface of the temperature control slide plate, and the closing valve plate is fixedly connected to the end of the drive plate facing away from the temperature control slide plate.

[0012] Furthermore, the cross-section of the closing valve plate is fan-shaped, and the closing valve plate is provided with multiple groups and spliced ​​together to form a closed circle that matches the end of the hot-melt extrusion joint. The fitting part of the fitting cavity and the hot-melt extrusion joint is made of high thermal conductivity metal material.

[0013] As a further solution of the present aspect, the driven sleeve includes a tapered sleeve and an extruded sleeve, the tapered sleeve is tapered, and the extruded sleeve is fixedly connected to an end of the tapered sleeve with a smaller area.

[0014] Furthermore, the tapered sleeve is slidably connected to the interior of the extrusion cavity, and the end of the hot-melt extrusion joint is provided with an outer wall that is compatible with the tapered sleeve and the extrusion sleeve, and the outer wall is made of a high thermal conductivity metal material.

[0015] As a further solution of the present aspect, an abutment rod is elastically embedded in the inner wall of the hot-melt extrusion joint, one end of the abutment rod is in contact with the bottom of the driven sleeve, and the end of the abutment rod facing away from the driven sleeve is elastically connected to a limiting rod through an elastic member, and the limiting rod extends through the hot-melt extrusion joint until it is in contact with the surface of the driving plate, and a limiting groove matching the limiting rod is provided on the surface of the driving plate.

[0016] As a further solution of the present aspect, the cutting mechanism includes a connecting rod, a cutting blade and a spring groove. The cutting blade is slidably arranged inside the fitting cavity. The end of the cutting blade is conical. The cutting blade is provided in multiple groups and the ends can be spliced ​​with each other. The spring groove is opened inside the cutting blade. The connecting rod slides inside the spring groove through a driving mechanism. An elastic member is provided between the connecting rod and the spring groove.

[0017] Furthermore, the cutting blades are provided in four groups and are symmetrically arranged along the center of the extrusion sleeve.

[0018] As a further solution of the present aspect, a cutting groove adapted to a cutting blade is provided on an inner wall of the extrusion sleeve, and a through hole adapted to the abutment rod is provided through the cutting blade.

[0019] As a further solution of this aspect, the driving mechanism includes a tooth plate, a driving gear and a tooth groove, the tooth groove is opened on the surface of the driving plate, the tooth plate is slidably arranged inside the fitting cavity, the tooth plate is meshed with the tooth groove through the driving gear, and the connecting rod is fixedly connected to the tooth plate.

[0020] When the present invention is in use, the temperature of the end of the hot-melt extrusion joint is sensed by a temperature control mechanism. When the temperature reaches a suitable discharge temperature, the adaptive valve plate can be controlled to open for discharge, thereby effectively maintaining the stability of the discharge temperature of the hot-melt extrusion joint and avoiding the problem of temperature difference caused by excessive heat dissipation at the discharge port due to the conical design at the end of the hot-melt extrusion joint. A cutting mechanism is also provided inside the hot-melt extrusion joint to cut off the residual solidified material at the end to avoid blockage of the hot-melt extrusion joint. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0022] Figure 1 It is an overall schematic diagram of the present invention; Figure 2 It is a schematic diagram of the internal structure of the present invention; Figure 3 is a schematic diagram of the structure of the adaptive valve plate of the present invention; Figure 4 It is a structural schematic diagram of the adaptive valve plate of the present invention in a closed state; Figure 5 The present invention Figure 2 The enlarged structural diagram at A in the middle; Figure 6 It is a schematic diagram of the structure of the driven sleeve of the present invention; Figure 7 The present invention Figure 2 The enlarged structural diagram at B in the middle; Figure 8It is a schematic structural diagram of the cutting mechanism of the present invention in the cutting state; Fig. 9 It is a schematic diagram of the driving principle of the cutting mechanism of the present invention; Fig.10 The present invention Fig. 9 Enlarged structural diagram at point C in the middle.

[0023] In the figure: 1. temperature control mechanism; 2. hot melt extrusion joint; 3. adaptive valve plate; 4. extrusion chamber; 5. driven sleeve; 6. cutting mechanism; 7. fitting chamber; 8. temperature control slide plate; 9. control chamber; 10. drive plate; 11. closing valve plate; 12. limiting groove; 13. tooth groove; 14. abutment rod; 15. cutting groove; 16. elastic member; 17. limiting clamping rod; 18. conical sleeve; 19. extrusion sleeve; 20. tooth plate; 21. driving gear; 22. connecting rod; 23. cutting blade; 24. spring groove; 25. through hole. DETAILED DESCRIPTION

[0024] Embodiment 1: Figure 1 - Figure 2 As shown, a polyolefin material recovery device includes a hot melt extrusion joint 2 installed on the melt recovery device, a temperature control mechanism 1 is provided at the end of the hot melt extrusion joint 2, an adaptive valve plate 3 which opens and closes with the temperature control of the temperature control mechanism 1 is provided in the middle of the temperature control mechanism 1, the adaptive valve plate 3 can be opened after reaching a specified temperature, and a cutting mechanism 6 for cutting off the waste material at the end of the hot melt extrusion joint 2 is embedded inside the temperature control mechanism 1.

[0025] Furthermore, the end of the hot melt extrusion joint 2 has a tapered structure.

[0026] During use, the temperature of the end of the hot-melt extrusion joint 2 is sensed by a temperature control mechanism 1. When the temperature reaches a suitable discharge temperature, the adaptive valve plate 3 can be controlled to open for discharge, thereby effectively maintaining the stability of the discharge temperature of the hot-melt extrusion joint 2 and avoiding the problem of temperature difference caused by excessive heat dissipation at the discharge port due to the conical design at the end of the hot-melt extrusion joint 2. A cutting mechanism 6 is also provided inside the hot-melt extrusion joint 2. After the extrusion of the hot-melt extrusion joint 2 is completed, material will remain at the end thereof, and the material in this area will be rapidly cooled due to the temperature to form defective products, thereby contaminating the subsequent extruded material, and it is also easy to cause blockage of the hot-melt extrusion joint 2 after cooling and solidification.

[0027] Embodiment 2: Based on embodiment 1, Figure 1-4 As shown, a control chamber 9 and a bonding chamber 7 are provided inside the temperature control mechanism 1 . The bonding chamber 7 is bonded to the end of the hot-melt extrusion joint 2 , and the control chamber 9 is communicated with the bonding chamber 7 .

[0028] like Figure 1 - Figure 4As shown, the adaptive valve plate 3 includes a temperature control slide plate 8, a drive plate 10 and a closing valve plate 11. The temperature control slide plate 8 is elastically connected to the inside of the control chamber 9, the drive plate 10 is fixedly connected to the side end surface of the temperature control slide plate 8, and the closing valve plate 11 is fixedly connected to the end of the drive plate 10 away from the temperature control slide plate 8.

[0029] Furthermore, the cross-section of the closing valve plate 11 is fan-shaped, and the closing valve plate 11 is provided with multiple groups and spliced ​​together to form a closed circle that matches the end of the hot-melt extrusion joint 2, and the fitting part of the fitting cavity 7 and the hot-melt extrusion joint 2 is made of high thermal conductivity metal material.

[0030] When in use, the end of the hot-melt extrusion joint 2 is closed by providing an adaptive valve plate 3, which effectively reduces the temperature imbalance caused by heat loss in the port part. At the same time, a fitting cavity 7 is provided, and the fitting cavity 7 fits with the end of the hot-melt extrusion joint 2, so that the fitting cavity 7 can conduct the internal heat of the hot-melt extrusion joint 2. When the internal temperature of the fitting cavity 7 rises and reaches the appropriate temperature, the internal medium expands due to heat, and the fitting cavity 7 is connected with the control cavity 9, so that the temperature control slide plate 8 slides inside the control cavity 9. At the same time, the temperature control slide plate 8 drives the closing valve plate 11 to move through the driving plate 10, so that the closing valve plate 11 is opened, and the end of the hot-melt extrusion joint 2 can be released. The material inside the hot-melt extrusion joint 2 can be discharged only after reaching a suitable temperature, thereby effectively controlling the stability of the material at the discharge end.

[0031] like Figure 1 - Figure 4 As shown, an extrusion cavity 4 is provided inside the hot melt extrusion joint 2 , and a driven sleeve 5 is elastically embedded in the inner wall of the extrusion cavity 4 , and the driven sleeve 5 is elastically fitted with the fitting cavity 7 .

[0032] Furthermore, a buffer gap is provided between the driven sleeve 5 and the fitting cavity 7 .

[0033] When in use, the driven sleeve 5 is elastically arranged inside the extrusion cavity 4, and the driven sleeve 5 is elastically fitted with the fitting cavity 7. The driven sleeve 5 can be made of high thermal conductivity metal material. When the hot melt extrusion joint 2 is extruded, the material pressure inside the extrusion cavity 4 will press the driven sleeve 5 to move and fit with the fitting cavity 7, so that the material temperature inside the driven sleeve 5 can be quickly transferred to the inside of the fitting cavity 7, which is used to drive the opening of the adaptive valve plate 3. When the hot melt extrusion joint 2 is extruded, the driven sleeve 5 will be separated from the fitting cavity 7 under the action of elastic force, so that there is a certain gap between the driven sleeve 5 and the fitting cavity 7. The gap blocks the heat exchange between the material inside the driven sleeve 5 and the fitting cavity 7, thereby effectively reducing the cooling of the material inside the hot melt extrusion joint 2.

[0034] like Figure 1 - Figure 4 and Figure 6As shown, the driven sleeve 5 includes a tapered sleeve 18 and an extruded sleeve 19 . The tapered sleeve 18 is tapered, and the extruded sleeve 19 is fixedly connected to an end of the tapered sleeve 18 with a smaller area.

[0035] Furthermore, the conical sleeve 18 is slidably connected to the inside of the extrusion cavity 4, and the end of the hot melt extrusion joint 2 is provided with an outer wall that is compatible with the conical sleeve 18 and the extrusion sleeve 19, and the outer wall is made of a high thermal conductivity metal material.

[0036] When in use, the tapered sleeve 18 is provided, and the tapered sleeve 18 is tapered, which can effectively increase the extrusion pressure of the hot melt extrusion joint 2 and improve the extrusion effect on the material.

[0037] like Figure 1 - Figure 5 As shown, an abutment rod 14 is elastically embedded in the inner wall of the hot-melt extrusion joint 2, one end of the abutment rod 14 is in contact with the bottom of the driven sleeve 5, and the end of the abutment rod 14 facing away from the driven sleeve 5 is elastically connected to a limiting clamping rod 17 through an elastic member 16. The limiting clamping rod 17 extends through the hot-melt extrusion joint 2 until it is in contact with the surface of the driving plate 10, and a limiting groove 12 adapted to the limiting clamping rod 17 is provided on the surface of the driving plate 10.

[0038] When in use, the abutment rod 14 elastically supports the driven sleeve 5. When the hot-melt extrusion joint 2 is discharging material, the driven sleeve 5 will press the abutment rod 14, and the abutment rod 14 moves inside the hot-melt extrusion joint 2, thereby pressing the elastic member 16 between the abutment rod 14 and the limiting clamp rod 17, so that the pressure of the limiting clamp rod 17 on the limiting groove 12 increases, so that the limiting clamp rod 17 and the limiting groove 12 elastically limit the temperature control slide plate 8, and the limiting force is proportional to the extrusion pressure of the hot-melt extrusion joint 2. Through the elastic limitation of the limiting clamp rod 17, the adaptive valve plate 3 can only be opened when the temperature of the fitting cavity 7 reaches the specified value and the internal pressure is sufficient, thereby avoiding material leakage caused by the premature opening of the adaptive valve plate 3, and at the same time, the stability of the initial shape of the material can also be ensured.

[0039] like Figure 1 - Fig.10 As shown, the cutting mechanism 6 includes a connecting rod 22, a cutting blade 23 and a spring groove 24. The cutting blade 23 is slidably arranged inside the fitting cavity 7. The end of the cutting blade 23 is conical. The cutting blade 23 is provided with multiple groups and the ends can be spliced ​​with each other. The spring groove 24 is opened inside the cutting blade 23. The connecting rod 22 slides inside the spring groove 24 through the driving mechanism, and an elastic member 16 is provided between the connecting rod 22 and the spring groove 24.

[0040] Furthermore, four groups of cutting blades 23 are symmetrically arranged along the center of the extrusion sleeve 19 .

[0041] When in use, the driving mechanism drives the connecting rod 22 to move inside the spring groove 24, so that the connecting rod 22 drives the cutting blade 23 to move to cut off the excess material inside the extrusion sleeve 19, thereby avoiding contamination of subsequent materials. At the same time, the spring groove 24 can be provided with multiple groups, the end of the cutting blade 23 is conical, and the multiple groups of cutting blades 23 are spliced ​​with each other to effectively improve the cutting effect.

[0042] like Figure 1 - Fig.10 As shown, the inner wall of the extrusion sleeve 19 is provided with a cutting groove 15 matched with the cutting blade 23 , and the cutting blade 23 is provided with a through hole 25 matched with the abutment rod 14 .

[0043] When in use, the cutting groove 15 is provided so that the cutting blade 23 can pass through the cutting groove 15 to cut the material inside the extrusion sleeve 19. At the same time, a through hole 25 is provided to prevent the cutting blade 23 from interfering with the abutment rod 14 when moving.

[0044] like Figure 1 - Fig.10 As shown, the driving mechanism includes a tooth plate 20, a driving gear 21 and a tooth groove 13. The tooth groove 13 is opened on the surface of the driving plate 10. The tooth plate 20 is slidably arranged inside the fitting cavity 7. The tooth plate 20 is meshed with the tooth groove 13 through the driving gear 21, and the connecting rod 22 is fixedly connected to the tooth plate 20.

[0045] During use, when the temperature inside the fitting chamber 7 rises, the driving plate 10 moves, thereby driving the driving gear 21 to rotate, so that the tooth plate 20 drives the connecting rod 22 to slide and compress the elastic member 16 inside the spring groove 24, but at this time the driven sleeve 5 is pressurized and fits with the end of the hot melt extrusion joint 2. At this time, the cutting blade 23 is misaligned with the cutting groove 15. When the hot melt extrusion joint 2 stops extruding, the driven sleeve 5 moves up under the action of elastic force so that the cutting blade 23 is at the same level as the cutting groove 15. At this time, due to the heat dissipation hysteresis inside the fitting chamber 7, the elastic member 16 inside the spring groove 24 is still in a contracted state, and its spring groove 24 elastically extends to the inside of the extrusion sleeve 19 through the elastic member 16, thereby cutting off the excess material inside the extrusion sleeve 19, and the adaptive valve plate 3 is still in an open state during cutting, which is convenient for the discharge of the cut material. When the temperature inside the fitting chamber 7 is restored, the adaptive valve plate 3 is closed and the cutting blade 23 will also be retracted to the inside of the fitting chamber 7 to complete the reset.

[0046] Working principle: The temperature of the end of the hot-melt extrusion joint 2 is sensed by a temperature control mechanism 1. When the temperature reaches the appropriate discharge temperature, the adaptive valve plate 3 can be controlled to open for discharge, thereby effectively maintaining the stability of the discharge temperature of the hot-melt extrusion joint 2 and avoiding the problem of temperature difference caused by excessive heat dissipation at the discharge port due to the conical design at the end of the hot-melt extrusion joint 2. A cutting mechanism 6 is also provided inside the hot-melt extrusion joint 2. After the hot-melt extrusion joint 2 is extruded, there will be material residue at the end thereof, and the material in this area will be rapidly cooled due to the temperature to form defective products, thereby contaminating the subsequent extruded materials, and it is also easy to cause blockage of the hot-melt extrusion joint 2 after cooling and solidification. The sealing is carried out to effectively reduce the temperature imbalance caused by the heat loss of the port part. At the same time, the fitting cavity 7 is provided, and the fitting cavity 7 fits with the end of the hot-melt extrusion joint 2, so that the fitting cavity 7 can conduct the heat inside the hot-melt extrusion joint 2. When the temperature inside the fitting cavity 7 rises and reaches the appropriate temperature, the internal medium expands due to heat, and the fitting cavity 7 is connected with the control cavity 9, so that the temperature control slide plate 8 slides inside the control cavity 9. At the same time, the temperature control slide plate 8 drives the closing valve plate 11 to move through the driving plate 10, so that the closing valve plates 11 are opened, and the sealing of the end of the hot-melt extrusion joint 2 can be released, so that the material inside the hot-melt extrusion joint 2 can be discharged only after reaching the appropriate temperature, effectively controlling the stability of the material at the discharge end, and the driven sleeve 5 is elastic. The driven sleeve 5 is elastically fitted with the fitting cavity 7. The driven sleeve 5 can be made of a high thermal conductivity metal material. When the hot melt extrusion joint 2 is extruded, the material pressure inside the extrusion cavity 4 will press the driven sleeve 5 to move and fit with the fitting cavity 7, so that the temperature of the material inside the driven sleeve 5 can be quickly transferred to the inside of the fitting cavity 7 to drive the opening of the adaptive valve plate 3. When the hot melt extrusion joint 2 is extruded, the driven sleeve 5 will be separated from the fitting cavity 7 under the action of elastic force, so that there is a certain gap between the driven sleeve 5 and the fitting cavity 7. The gap blocks the heat exchange between the material inside the driven sleeve 5 and the fitting cavity 7, thereby effectively reducing the cooling of the material inside the hot melt extrusion joint 2. By providing a tapered sleeve 18, and the tapered sleeve 1 8 is conical, which can effectively increase the extrusion pressure of the hot-melt extrusion joint 2 and improve the extrusion effect of the material. The abutting rod 14 elastically supports the driven sleeve 5. When the hot-melt extrusion joint 2 is discharging, the driven sleeve 5 will press the abutting rod 14, and the abutting rod 14 moves inside the hot-melt extrusion joint 2, thereby pressing the elastic member 16 between the abutting rod 14 and the limiting clamping rod 17, so that the pressure of the limiting clamping rod 17 on the limiting groove 12 increases, so that the limiting clamping rod 17 and the limiting groove 12 elastically limit the temperature control slide plate 8, and the limiting force is proportional to the extrusion pressure of the hot-melt extrusion joint 2. Through the elastic limitation of the limiting clamping rod 17, the adaptive valve plate 3 can only be opened when the temperature of the fitting cavity 7 reaches the specified value and the internal pressure is sufficient.In order to avoid leakage of materials caused by premature opening of the adaptive valve plate 3, and also ensure the stability of the initial shape of the materials, the driving mechanism drives the connecting rod 22 to move inside the spring groove 24, so that the connecting rod 22 drives the cutting blade 23 to move to cut off the excess materials inside the extrusion sleeve 19, thereby avoiding contamination of subsequent materials. At the same time, the spring groove 24 can be provided with multiple groups, the end of the cutting blade 23 is conical, and the multiple groups of cutting blades 23 are spliced ​​with each other to effectively improve the cutting effect. By providing a cutting groove 15, the cutting blade 23 can pass through the cutting groove 15 to cut off the material inside the extrusion sleeve 19. At the same time, a through hole 25 is also provided to avoid interference between the cutting blade 23 and the abutting rod 14 when it moves. When the temperature inside the fitting cavity 7 rises, the driving plate 10 moves to drive the driving gear 21 to rotate, so that the tooth plate 20 The connecting rod 22 is driven to slide inside the spring groove 24 to compress the elastic member 16, but at this time, the driven sleeve 5 is pressed and fits with the end of the hot melt extrusion joint 2. At this time, the cutting blade 23 is misaligned with the cutting groove 15. When the hot melt extrusion joint 2 stops extruding, the driven sleeve 5 moves up under the action of elastic force so that the cutting blade 23 and the cutting groove 15 are at the same level. At this time, due to the heat dissipation hysteresis inside the fitting cavity 7, the elastic member 16 inside the spring groove 24 is still in a contracted state, and its spring groove 24 elastically extends to the inside of the extrusion sleeve 19 through the elastic member 16, thereby cutting off the excess material inside the extrusion sleeve 19, and the adaptive valve plate 3 is still in an open state during cutting, which is convenient for the discharge of the cut material. When the temperature inside the fitting cavity 7 is restored, the adaptive valve plate 3 is closed and the cutting blade 23 will also be retracted to the inside of the fitting cavity 7 to complete the reset.

Claims

1. A polyolefin material recovery device, comprising a hot melt extrusion connector installed in a melt recovery device, characterized in that: A temperature control mechanism is provided at the end of the hot-melt extrusion joint, and an adaptive valve plate is provided in the middle of the temperature control mechanism, which opens and closes according to the temperature control mechanism. The adaptive valve plate can be opened after reaching a specified temperature, and a cutting mechanism for cutting off the waste material at the end of the hot-melt extrusion joint is embedded inside the temperature control mechanism.

2. A polyolefin material recovery device according to claim 1, characterized in that: A control cavity and a bonding cavity are provided inside the temperature control mechanism. The bonding cavity is bonded to the end of the hot-melt extrusion joint, and the control cavity is communicated with the bonding cavity.

3. A polyolefin material recovery device according to claim 2, characterized in that: The adaptive valve plate includes a temperature control slide plate, a drive plate and a closing valve plate. The temperature control slide plate is elastically connected to the inside of the control cavity. The drive plate is fixedly connected to the side end surface of the temperature control slide plate. The closing valve plate is fixedly connected to the end of the drive plate away from the temperature control slide plate. An extrusion cavity is provided inside the hot melt extrusion joint. A driven sleeve is elastically embedded in the inner wall of the extrusion cavity. The driven sleeve is elastically fitted with the fitting cavity.

4. A polyolefin material recovery device according to claim 3, characterized in that: The driven sleeve comprises a tapered sleeve and an extruded sleeve, the tapered sleeve is tapered, and the extruded sleeve is fixedly connected to an end of the tapered sleeve with a smaller area.

5. A polyolefin material recovery device according to claim 4, characterized in that: An abutment rod is elastically embedded in the inner wall of the hot-melt extrusion joint, one end of the abutment rod is in contact with the bottom of the driven sleeve, and the end of the abutment rod facing away from the driven sleeve is elastically connected to a limiting rod through an elastic member, and the limiting rod extends through the hot-melt extrusion joint until it is in contact with the surface of the driving plate, and a limiting groove matching the limiting rod is provided on the surface of the driving plate.

6. A polyolefin material recovery device according to claim 5, characterized in that: The cutting mechanism includes a connecting rod, a cutting blade and a spring groove. The cutting blade is slidably arranged inside the fitting cavity. The end of the cutting blade is conical. The cutting blade is provided with multiple groups and the ends can be spliced ​​with each other. The spring groove is opened inside the cutting blade. The connecting rod slides inside the spring groove through a driving mechanism. An elastic member is provided between the connecting rod and the spring groove.

7. A polyolefin material recovery device according to claim 6, characterized in that: The inner wall of the extrusion sleeve is provided with a cutting groove matched with the cutting blade, and the cutting blade is provided with a through hole matched with the abutment rod.

8. A polyolefin material recovery device according to claim 7, characterized in that: The driving mechanism includes a tooth plate, a driving gear and a tooth groove, wherein the tooth groove is provided on the surface of the driving plate, the tooth plate is slidably arranged inside the fitting cavity, the tooth plate is meshed with the tooth groove through the driving gear, and the connecting rod is fixedly connected to the tooth plate.

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