A device and method for recycling waste wind power blades

Abstract

The present application relates to the technical field of wind power blade recycling, and specifically relates to a resource treatment device and method for waste wind power blades, the treatment device comprising a blade orientation arrangement device, an axial stretching loading device, a transverse moving device, a longitudinal moving device and a reaction kettle, the blade orientation arrangement device being used for adjusting the orientation of the cut waste wind power blades, the axial stretching loading device being used for causing the blade to generate cracks along the axial direction, the transverse moving device being used for clamping and moving the blade along the transverse direction, the longitudinal moving device being used for clamping and moving the blade along the longitudinal direction, and the reaction kettle being used for decomposing the blade by using a solvent, and the reaction kettle being provided with a solvent permeation device for pressing the solvent into the cracks of the blade; the treatment method can cause the blade to generate cracks along the fiber length direction before the depolymerization reaction is performed, and the solvent is pressed into the cracks, so that the solvent can more efficiently enter the core of the blade, and the time for resource treatment of the waste wind power blades by the chemical method is greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of wind turbine blade recycling technology, specifically to a resource-based treatment device and method for waste wind turbine blades. Background Technology

[0002] With the approaching retirement of wind turbine blades in my country, the resource-based treatment of waste wind turbine blades is becoming a new trend in the wind power industry. The main methods for recycling waste wind turbine blades are mechanical, pyrolysis, and chemical methods. Compared to mechanical and pyrolysis methods, chemical methods can better preserve the high-value fibers in the composite materials of wind turbine blades, making them the preferred choice for achieving high-value recycling of waste wind turbine blades in the future.

[0003] Currently, the main drawback of chemical methods for treating waste wind turbine blades is that, due to the large wall thickness of wind turbine blades and the dense thermosetting resin matrix, solvent molecules have great difficulty penetrating into the core of the material, resulting in low solvent mass transfer efficiency and long processing time for wind turbine blades, which cannot meet the industrial needs of waste wind turbine blade recycling.

[0004] Some existing technologies attempt to use alternating hot and cold cycles to accelerate blade aging and assist solvent penetration. However, due to the low thermal conductivity of the blade composite material, the long hot and cold cycle, and the huge energy consumption, and the fact that the cracks generated by the simple thermal stress are in a disordered state, it is still impossible for the solute to enter the core of the material efficiently. Summary of the Invention

[0005] The purpose of this invention is to provide a resource-based treatment device and method for waste wind turbine blades to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A resource recovery device for waste wind turbine blades includes a blade orientation adjustment device, an axial tension loading device, a lateral movement device, a longitudinal movement device, and a reaction vessel. The blade orientation adjustment device is used to adjust the orientation of the cut waste wind turbine blades. The axial tension loading device is located at the output end of the blade orientation adjustment device and is used to generate cracks along the axial direction of the blade. The lateral movement device is located on one side of the axial tension loading device and is used to clamp and move the blade laterally. The longitudinal movement device is located at the end of the lateral movement device and is used to clamp and move the blade longitudinally. The reaction vessel is located on one side of the longitudinal movement device and is used to decompose the blades using solvents. The reaction vessel is equipped with a solvent penetration device to force the solvent into the blade cracks.

[0008] Furthermore, the axial tension loading device includes a cryogenic chamber, a bearing plate, a loading hydraulic cylinder, and a clamping mechanism. The bearing plate is slidably disposed in the middle of the cryogenic chamber, and a bearing spring is connected between the lower part of the bearing plate and the bottom of the cryogenic chamber. There are two loading hydraulic cylinders, which are symmetrically disposed in the middle of both sides of the cryogenic chamber. The movable end of the loading hydraulic cylinder is connected to the clamping mechanism, and the clamping mechanism clamps multiple blades placed on the bearing plate.

[0009] Furthermore, the solvent permeation device includes a base, a fixed insert plate, and a movable insert plate. The base is fixedly installed at the bottom of the reactor. Multiple fixed insert plates and multiple movable insert plates are provided, with each fixed insert plate and movable insert plate corresponding to the other. The fixed insert plates are fixedly installed on the base at intervals, and the movable insert plates are slidably installed on the base at intervals. A tensioning spring is connected between the side of the movable insert plate away from the corresponding fixed insert plate and the base.

[0010] Furthermore, the top of the reactor is provided with a solvent inlet, which is connected to several branch pipes and a main pipe. The main pipe is connected to the reactor. A fixed insert plate and a movable insert plate are each connected to a branch pipe. Several nozzles and a limiting grid are fixedly provided on the side of the fixed insert plate and the movable insert plate facing each other. The blades are placed between the two corresponding limiting grids.

[0011] Furthermore, the blade orientation adjustment device includes a conveyor, a scanning device, and a commutator. The conveyor is used to transport the cut waste wind turbine blades. The scanning device is fixedly installed at the upper end of the conveyor and is used to identify the axial orientation of the transported blades. The commutator is located near the end of the conveyor and is used to rotate the blades.

[0012] Furthermore, the lateral movement device includes a lateral track, a lateral support, and a lateral clamping mechanism. One end of the lateral track is close to the blade orientation adjustment device, and the other end is close to the reactor. The bottom of the lateral support slides in conjunction with the lateral track, and a lifting rod is installed at the upper end of the lateral support. The lateral clamping mechanism is located at the movable end of the lifting rod and is used to clamp the left and right sides of the blade.

[0013] Furthermore, the longitudinal moving device includes a longitudinal track, a longitudinal support, a rotary drive device, a telescopic arm, and a longitudinal clamping mechanism. The longitudinal track is placed vertically on one side of the transverse track. The longitudinal support is slidably engaged with the longitudinal track. The rotary drive device is mounted on the top of the longitudinal support. The output shaft axis of the rotary drive device is perpendicular to the longitudinal track. The output shaft of the rotary drive device is connected to the telescopic arm. The longitudinal clamping mechanism is located at the movable end of the telescopic arm and is used to clamp the upper and lower sides of the blade.

[0014] Furthermore, it also includes a solvent recovery device, which is connected to the bottom of the reactor and is used to recover solvents and resins.

[0015] This invention also provides a method for the resource recovery of waste wind turbine blades, applied to the aforementioned waste wind turbine blade resource recovery device, comprising the following steps:

[0016] S1: The blade orientation adjustment device adjusts the blade so that its axial direction is parallel to the stretching direction of the axial tension loading device.

[0017] S2: The lateral moving device moves the blades one by one into the cryogenic chamber. Under the low temperature environment, the resin matrix of the blades becomes brittle.

[0018] S3: The clamping mechanism holds the blades in the cryogenic chamber, and the loading hydraulic cylinder applies axial cyclic tensile stress to the blades, causing the blades, after the resin matrix has become brittle, to develop cracks along the axial direction.

[0019] S4: The lateral moving device removes the cracked blades from the cryogenic chamber, and the longitudinal moving device transfers the blades, adjusting the fiber direction of the blades from horizontal to vertical, and then sending them one by one into the solvent permeation device.

[0020] S5: Open the solvent inlet and spray the solvent alternately on the left and right sides of the blade to force the solvent into the cracks that have formed in the blade;

[0021] S6: After a period of time, fill the reactor with solvent to carry out a complete depolymerization reaction;

[0022] S7: After the depolymerization reaction is completed, the solvent after the reaction flows into the solvent recovery device to recover the solvent and resin, and the high-value fibers left in the reactor are taken out.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] This invention provides a resource-based treatment device and method for waste wind turbine blades. The device uses a blade orientation adjustment device to adjust the axial position of the blade, an axial tension loading device to perform low-temperature embrittlement on the blade and apply axial cyclic tensile stress to help the blade generate cracks along its length, a solvent penetration device to press the solvent into the cracks so that the solvent can enter the blade core more efficiently, and a transverse movement device and a longitudinal movement device to realize the transfer of the blade. This method is more suitable for the industrial application of chemical resource-based treatment of waste wind turbine blades. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of a resource recovery device for waste wind turbine blades according to the present invention.

[0026] Figure 2 This is a schematic diagram of the blade orientation adjustment device described in this invention;

[0027] Figure 3 This is a schematic diagram of the axial tensile loading device described in this invention;

[0028] Figure 4 This is a schematic diagram of the lateral moving device and the longitudinal moving device described in this invention;

[0029] Figure 5 This is a schematic diagram of the reactor structure described in this invention;

[0030] Figure 6 This is a schematic diagram of the internal structure of the reaction vessel described in this invention;

[0031] Figure 7 This is a schematic diagram of the solvent permeation device described in this invention;

[0032] Figure 8 This is a schematic diagram of the lateral movement device described in this invention;

[0033] Figure 9 This is a schematic diagram of the clamping mechanism described in this invention.

[0034] In the diagram: 1. Blade orientation adjustment device; 11. Conveyor; 12. Scanning equipment; 13. Reversing mechanism; 131. Support; 132. Bogie; 133. Reversing drive device; 2. Axial tension loading device; 21. Cryogenic chamber; 211. Limiting groove; 212. Door; 213. Refrigeration unit; 22. Bearing plate; 221. Extension plate; 222. Bearing spring; 23. Loading hydraulic cylinder; 24. Clamping mechanism; 241. Housing; 242. Clamping telescopic rod; 243. Link 1; 244. Link 2; 245. Link 3; 246. Clamping plate; 25. Limiting telescopic rod; 251. Limiting plate; 3. Lateral movement device; 31 1. Horizontal track; 32. Horizontal movement support; 33. Extension arm; 34. Lifting rod; 35. Horizontal movement clamping mechanism; 4. Longitudinal movement device; 41. Longitudinal track; 42. Longitudinal movement support; 43. Rotary drive device; 44. Telescopic arm; 45. Longitudinal movement clamping mechanism; 5. Reactor; 51. Reactor door; 52. Solvent inlet; 521. Diverter plate; 522. Branch pipe; 523. Main pipe; 53. Outlet pipe; 54. Solvent permeation device; 541. Base; 542. Slide groove; 543. Top clamping spring; 544. Baffle; 545. Fixed insert plate; 546. Movable insert plate; 547. Nozzle; 548. Limiting grid; 6. Solvent recovery device. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] In the following description of the invention, it should be noted that the terms "upper," "lower," "left," "right," "inner," and "outer," 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 invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. The term "connection" simply indicates a connection between devices and has no special meaning.

[0037] Furthermore, the technical fields and installation methods involved in the embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0038] Specific implementation examples Figures 1-9 The aforementioned device for the resource recovery of waste wind turbine blades includes a blade orientation adjustment device 1, an axial tension loading device 2, a lateral movement device 3, a longitudinal movement device 4, and a reaction vessel 5. The blade orientation adjustment device 1 is used to adjust the orientation of the cut waste wind turbine blades. The axial tension loading device 2 is located at the output end of the blade orientation adjustment device 1 and is used to cryogenically freeze the blades and apply cyclic tensile stress along the blade axis, causing cracks to form along the axial direction of the blades to facilitate subsequent solvent penetration. The blade axis is also the direction of fiber length inside the blade. The lateral movement device 3 is located on one side of the axial tension loading device 2 and is used to clamp and move the blades laterally, moving the blades into or out of the axial tension loading device 2. The longitudinal movement device 4 is located at the end of the lateral movement device 3 and is used to clamp and move the blades longitudinally, sending the blades into the reaction vessel 5. The reaction vessel 5 is located on one side of the longitudinal movement device 4 and is used to decompose the resin matrix in the blades using solvents to separate complete high-value fibers.

[0039] Furthermore, the blade orientation straightening device 1 includes a conveyor 11, a scanning device 12, and a commutator 13. The conveyor 11 is used to transport the cut waste wind turbine blades. The scanning device 12 is fixedly installed at the upper end of the conveyor 11 to identify the axial orientation of the transported blades. The commutator 13 is located near the end of the conveyor 11. The conveyor 11 transports the blades to the commutator 13. Based on the identification result of the scanning device 12, the commutator 13 rotates the blades so that their axial direction is parallel to the stretching direction of the axial tension loading device 2.

[0040] Furthermore, in this embodiment, the conveyor 11 is a roller conveyor, which is existing technology; the scanning device 12 is a 3D vision camera, which is existing technology; the reversing mechanism 13 includes a support 131 and a turntable 132. The turntable 132 is rotatably mounted above the support 131. The blades are conveyed to the turntable 132. The turntable 132 is driven by a reversing drive device 133. In this embodiment, the reversing drive device 133 adopts a gear meshing mechanism. A drive gear is installed on the support 131, and a driven gear is fixedly installed at the lower middle part of the turntable 132. The drive gear meshes with the driven gear. The rotation of the drive gear drives the turntable 132 to rotate, thereby adjusting the blade orientation. The drive gear is driven by a drive motor, which is equipped with a reducer and a braking mechanism, which is existing technology.

[0041] Furthermore, the lateral moving device 3 includes a lateral track 31, a lateral support 32, and a lateral clamping mechanism 35. The lateral track 31 is placed on one side of the axial tension loading device 2, and the lateral track 31 is arranged in the same direction as the conveyor 11. The starting end of the lateral track 31 is close to the reversing machine 13, and the end is close to the reactor 5. The bottom of the lateral support 32 is slidably engaged with the lateral track 31. In this embodiment, the lateral support 32 is driven by a motor installed at the bottom to slide along the lateral track 31. An extension arm 33 is fixedly extended from the upper end of the lateral support 32 towards the side close to the axial tension loading device 2. A lifting rod 34 is installed at the end of the extension arm 33. The lifting rod 34 is electrically or hydraulically driven. The lateral clamping mechanism 35 is located at the movable end of the lifting rod 34 and is used to clamp the left and right sides of the blade.

[0042] Furthermore, the axial tension loading device 2 includes a cryogenic chamber 21, a bearing plate 22, a loading hydraulic cylinder 23, and a clamping mechanism 24. Limiting grooves 211 are symmetrically opened at the middle of both ends of the cryogenic chamber 21. The cryogenic chamber 21 has an opening at the top, and a door 212 is slidably provided at the opening at the top. When the door 212 is closed, the cryogenic chamber 21 is completely sealed. The cryogenic chamber 21 creates a low-temperature environment inside the chamber through a refrigeration device 213, thereby making the resin matrix of the blade placed in the cryogenic chamber 21 brittle and facilitating the generation of blade cracks.

[0043] The support plate 22 is located in the middle of the cryogenic chamber 21. Extending plates 221 extend symmetrically from both ends of the support plate 22. Each extending plate 221 slides into a limiting groove 211 at the same end. Several support springs 222 are connected to the lower part of the support plate 22. The lower ends of the support springs 222 are connected to the bottom of the cryogenic chamber 21. The transverse clamping mechanism 35 moves the blades one by one above the support plate 22 and then releases them. The blades stack one by one on the support plate 22. The support plate 22 slides downwards gradually under the weight of the blades, and the support springs 222 are gradually compressed until the extending plates 221 reach the bottom of the limiting groove 211. Limiting telescopic rods 25 are provided on both sides of the limiting groove 211. The movable end of each limiting telescopic rod 25 is fixedly connected to a limiting plate 251 to limit the blades from swaying in a direction perpendicular to the axial direction. The limiting telescopic rods 25 are driven electrically or hydraulically.

[0044] There are two loading hydraulic cylinders 23, which are symmetrically arranged in the middle of both sides of the cryogenic chamber 21. The movable end of the loading hydraulic cylinder 23 is connected to the clamping mechanism 24. When the loading hydraulic cylinder 23 extends, the clamping mechanism 24 clamps multiple blades placed on the support plate 22. The loading hydraulic cylinder 23 applies axial cyclic tensile stress to the blades. In this embodiment, the loading hydraulic cylinder 23 is a double-acting piston hydraulic cylinder, which can reciprocate to apply tensile force and unload tensile force, which is the prior art. Due to the different deformation capabilities of the embrittled resin matrix and the fiber, when the loading hydraulic cylinder applies tensile force, there is a relative slippage tendency between the resin and the fiber at the bonding interface, which in turn forms shear stress. During the reciprocating application and unloading of tensile force by the loading hydraulic cylinder, the shear stress is repeatedly applied, and fatigue damage occurs at the bonding interface between the resin and the fiber, resulting in cracks. As fatigue damage accumulates, the cracks gradually extend along the fiber direction.

[0045] Furthermore, the longitudinal moving device 4 includes a longitudinal track 41, a longitudinal moving bracket 42, a rotary drive device 43, a telescopic arm 44, and a longitudinal moving clamping mechanism 45. The longitudinal track 41 is placed perpendicular to one side of the transverse track 31. The longitudinal moving bracket 42 is slidably engaged with the longitudinal track 41. The lower part of the longitudinal moving bracket 42 is moved by a motor-driven roller, causing the longitudinal moving bracket 42 to slide along the longitudinal track 41. The rotary drive device 43 is installed on the top of the longitudinal moving bracket 42. The output shaft axis of the rotary drive device 43 is perpendicular to the longitudinal track 41, and the output shaft of the rotary drive device 43 is connected to the telescopic arm 44. The longitudinal moving clamping mechanism 45 is disposed on the telescopic arm 44. At the movable end of arm 44, after the transverse clamping mechanism 35 moves the blade out of the axial tension loading device 2, the longitudinal clamping mechanism 45 clamps the upper and lower sides of the blade. The transverse clamping mechanism 35 then releases, completing the blade transfer. The rotary drive device 43 is activated, and the blade rotates with the longitudinal clamping mechanism 45, adjusting the blade from a horizontal to a vertical position. The longitudinal clamping mechanism 45 slides with the longitudinal support 42 and moves in the opposite direction towards the reactor 5 as the telescopic arm 44 extends, allowing the blades to be fed into the reactor 5 one by one. Through the transverse moving device 3 and the longitudinal moving device 4, continuous transfer of blades can be achieved, which better meets the needs of industrialization.

[0046] Furthermore, in this embodiment, the rotary drive device 43 is a rotary motor, which is equipped with a reducer and a braking mechanism, which is the prior art; the telescopic arm 44 is composed of multiple telescopic sections stacked one on top of another, and is driven to extend and retract by the main hydraulic cylinder inside the first telescopic section, which is the prior art.

[0047] Furthermore, the reactor 5 has an opening on the side near the longitudinal moving device 4, and a door 51 is slidably provided at the opening of the reactor 5. The inner wall of the reactor 5 is provided with a heating layer (not shown in the figure) to provide the temperature required for the depolymerization reaction. The top of the reactor 5 is provided with a solvent inlet 52, which is connected to a flow divider 521. The flow divider 521 is installed at the upper part of the interior of the reactor 5. Several branch pipes 522 and a main pipe 523 are connected below the flow divider 521. The solvent is diverted from the solvent inlet 52 to each branch pipe 522. The main pipe 523 is connected to the reactor 5 and is used to fill the reactor 5 with solvent during the complete depolymerization reaction. The bottom of the reactor 5 is connected to an outlet pipe 53, from which the solvent after the reaction is fully completed flows out.

[0048] The reaction vessel 5 is equipped with a solvent permeation device 54, which includes a base 541, a fixed insert plate 545, and a movable insert plate 546. The base 541 is fixedly installed at the bottom of the reaction vessel 5. The base 541 has multiple sliding grooves 542 along the direction parallel to the longitudinal track 41. Multiple fixed insert plates 545 and multiple movable insert plates 546 are provided. The fixed insert plates 545 and the movable insert plates 546 correspond one to one. The fixed insert plates 545 are fixedly installed on the base 541 at intervals. The movable insert plates 546 are slidably installed on the base 541 at intervals. The movable insert plates 546 are slidably engaged with the sliding grooves 542. A clamping spring 543 is connected to the side of the movable insert plate 546 away from the corresponding fixed insert plate 545. The other end of the clamping spring 543 is connected to the base 541. The clamping spring 543 is located in the sliding groove 542. A baffle 544 is fixedly installed on the side of the base 541 away from the vessel door 51.

[0049] The upper ends of the fixed insert plate 545 and the movable insert plate 546 are each connected to a branch pipe 522. Several nozzles 547 and a limiting grid 548 are fixedly installed on the side of the fixed insert plate 545 facing the movable insert plate 546 and the side of the movable insert plate 546 facing the fixed insert plate 545. The nozzles 547 are located between the limiting grid 548 and the fixed insert plate 545 or the movable insert plate 546. The longitudinal clamping mechanism 45 places the blade between the two corresponding limiting grids 548. Under the action of the restoring force of the top spring 543, the blade is clamped by the two limiting grids 548. An inclined guide plate is provided on the side of the limiting grid 548 near the vessel door 51 to facilitate the insertion of the blade. The nozzles 547 on both sides of the blade are opened alternately. The nozzles 547 spray solvent alternately on the left and right sides of the blade, pressing the solvent into the cracks that have been formed in the blade, so that the solvent enters the core of the blade more efficiently.

[0050] Furthermore, the waste wind turbine blade resource recovery device described in this embodiment also includes a solvent recovery device 6. The solvent recovery device 6 is connected to the outlet pipe 53. After the depolymerization reaction in the reactor 5 is completed, the outlet pipe 53 is opened, and the solvent containing the resin enters the solvent recovery device 6 to recover the solvent and resin. The high-value fiber remains in the reactor 5. After the fiber is taken out of the reactor 5, it can be directly recycled as a high-value material after simple treatment such as cleaning.

[0051] Furthermore, in this embodiment, the clamping mechanism 24, the transverse clamping mechanism 35, and the longitudinal clamping mechanism 45 have the same structure. Taking the clamping mechanism 24 as an example, it includes a housing 241, a clamping telescopic rod 242, and a clamping plate 246. The clamping telescopic rod 242 is located in the middle of the housing 241. The clamping telescopic rod 242 is electrically or hydraulically driven. Both sides of the movable end of the clamping telescopic rod 242 are hinged with a first connecting rod 243 and a second connecting rod 244. The first connecting rod 243 and the second connecting rod 244 are connected to each other. The second connecting rod 244 is arranged in parallel; there are two clamping plates 246, which are symmetrically arranged on both sides of the housing 241. Each clamping plate 246 is hinged to the end of the first connecting rod 243 and the second connecting rod 244 on the same side. The middle of the first connecting rod 243 is hinged to the third connecting rod 245, and the other end of the third connecting rod 245 is hinged to the housing 241. When the clamping telescopic rod 242 retracts, the two clamping plates 246 move in a straight line and approach each other, thereby clamping the blade.

[0052] The present invention also provides a method for resource recovery treatment of waste wind turbine blades using the above-mentioned waste wind turbine blade device, comprising the following steps:

[0053] S1: Conveyor 11 transports the cut waste wind turbine blades, scanning device 12 identifies the axial orientation of the blades, and commutator 13 rotates the blades according to the identification results so that their axial direction is parallel to the stretching direction of axial tension loading device 2.

[0054] S2: Open the hatch 212, the lateral moving device 3 clamps the blades on the commutator 13, and moves the blades one by one into the cryogenic chamber 21. Close the hatch 212, start the refrigeration device 213, and make the resin matrix of the blades brittle in a low-temperature environment.

[0055] S3: The clamping mechanism 24 clamps the blade inside the cryogenic chamber 21, and the loading hydraulic cylinder 23 applies axial cyclic tensile stress to the blade, causing the blade to crack along the axial direction after the resin matrix has become brittle.

[0056] S4: The clamping mechanism 24 is released, the hatch 212 and the reactor door 51 are opened, the transverse moving device 3 moves the cracked blade out of the cryogenic chamber 21, the longitudinal moving device 4 transfers the blade, and after adjusting the fiber direction of the blade from horizontal to vertical, it is sent into the solvent permeation device 54 in the reactor 5 one by one.

[0057] S5: Close the reactor door 51, open the solvent inlet 52, and use the nozzle 547 to alternately spray solvent on the left and right sides of the blade to force the solvent into the cracks that have formed in the blade.

[0058] S6: After a period of time, open the main pipe 523 and fill the reaction vessel 5 with solvent to carry out a complete depolymerization reaction;

[0059] S7: After the depolymerization reaction is completed, open the outlet pipe 53. The solvent after the reaction flows into the solvent recovery device 6 to recover the solvent and resin. Take out the high-value fiber left in the reactor 5.

[0060] Furthermore, the aforementioned method for the resource recovery of waste wind turbine blades allows for the application of axial cyclic tensile stress to the blades using the axial tensile loading device 2 before the depolymerization reaction. This causes cracks to form along the fiber length direction of the blades. The solvent is then injected into the cracks using the solvent penetration device 54, allowing the solvent to enter the blade core more efficiently. This significantly reduces the time required for the chemical resource recovery of waste wind turbine blades and facilitates the industrial application of chemical methods in the resource recovery of waste wind turbine blades.

[0061] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for the recycling of a spent wind turbine blade, characterized in that, The device includes a blade orientation adjustment device, an axial tension loading device, a lateral movement device, a longitudinal movement device, and a reaction vessel. The blade orientation adjustment device is used to adjust the orientation of the cut waste wind turbine blades. The axial tension loading device is located at the output end of the blade orientation adjustment device and is used to create axial cracks in the blade. The lateral movement device is located on one side of the axial tension loading device and is used to clamp and move the blade laterally. The longitudinal movement device is located at the end of the lateral movement device and is used to clamp and move the blade longitudinally. The reaction vessel is located on one side of the longitudinal movement device and is used to decompose the blade using a solvent. The reaction vessel is equipped with a solvent penetration device to force the solvent into the blade cracks. The solvent permeation device includes a base, a fixed insert plate, and a movable insert plate. The base is fixedly installed at the bottom of the reactor. Multiple fixed insert plates and multiple movable insert plates are provided. The fixed insert plates and the movable insert plates correspond one-to-one. The fixed insert plates are fixedly installed on the base at intervals. The movable insert plates are slidably installed on the base at intervals. A clamping spring is connected between the side of the movable insert plate away from the corresponding fixed insert plate and the base. The top of the reactor is provided with a solvent inlet, which is connected to several branch pipes and a main pipe. The main pipe is connected to the reactor. A fixed insert plate and a movable insert plate are each connected to a branch pipe. Several nozzles and a limiting grid are fixedly provided on the side of the fixed insert plate and the movable insert plate facing each other. The blades are placed between the two corresponding limiting grids.

2. A device for recycling of spent wind turbine blades according to claim 1, characterized in that, The axial tension loading device includes a cryogenic chamber, a bearing plate, a loading hydraulic cylinder, and a clamping mechanism. The bearing plate is slidably disposed in the middle of the cryogenic chamber. A bearing spring is connected between the lower part of the bearing plate and the bottom of the cryogenic chamber. There are two loading hydraulic cylinders, which are symmetrically disposed in the middle of both sides of the cryogenic chamber. The movable end of the loading hydraulic cylinder is connected to the clamping mechanism, which clamps multiple blades placed on the bearing plate.

3. A device for recycling of spent wind turbine blades according to claim 1, characterized in that, The blade orientation adjustment device includes a conveyor, a scanning device, and a commutator. The conveyor is used to transport the cut waste wind turbine blades. The scanning device is fixedly installed at the upper end of the conveyor and is used to identify the axial orientation of the transported blades. The commutator is located near the end of the conveyor and is used to rotate the blades.

4. A device for recycling of spent wind turbine blades according to claim 1, characterized in that, The lateral movement device includes a lateral track, a lateral support, and a lateral clamping mechanism. One end of the lateral track is close to the blade orientation adjustment device, and the other end is close to the reactor. The bottom of the lateral support slides in conjunction with the lateral track. A lifting rod is installed at the upper end of the lateral support. The lateral clamping mechanism is located at the movable end of the lifting rod and is used to clamp the left and right sides of the blade.

5. The resource recovery device for waste wind turbine blades according to claim 4, characterized in that, The longitudinal moving device includes a longitudinal track, a longitudinal support, a rotary drive device, a telescopic arm, and a longitudinal clamping mechanism. The longitudinal track is placed vertically on one side of the transverse track. The longitudinal support is slidably engaged with the longitudinal track. The rotary drive device is installed on the top of the longitudinal support. The output shaft of the rotary drive device is perpendicular to the longitudinal track. The output shaft of the rotary drive device is connected to the telescopic arm. The longitudinal clamping mechanism is located at the movable end of the telescopic arm and is used to clamp the upper and lower sides of the blade.

6. The resource recovery device for waste wind turbine blades according to claim 1, characterized in that, It also includes a solvent recovery device, which is connected to the bottom of the reactor and is used to recover solvents and resins.

7. A method for the resource recovery of waste wind turbine blades, applied to the resource recovery device for waste wind turbine blades as described in any one of claims 1-6, characterized in that, Includes the following steps: S1: The blade orientation adjustment device adjusts the blade so that its axial direction is parallel to the stretching direction of the axial tension loading device. S2: The lateral moving device moves the blades one by one into the cryogenic chamber. Under the low temperature environment, the resin matrix of the blades becomes brittle. S3: The clamping mechanism holds the blades in the cryogenic chamber, and the loading hydraulic cylinder applies axial cyclic tensile stress to the blades, causing the blades, after the resin matrix has become brittle, to develop cracks along the axial direction. S4: The lateral moving device removes the cracked blades from the cryogenic chamber, and the longitudinal moving device transfers the blades, adjusting the fiber direction of the blades from horizontal to vertical, and then sending them one by one into the solvent permeation device. S5: Open the solvent inlet and spray the solvent alternately on the left and right sides of the blade to force the solvent into the cracks that have formed in the blade; S6: After a period of time, fill the reactor with solvent to carry out a complete depolymerization reaction; S7: After the depolymerization reaction is completed, the solvent after the reaction flows into the solvent recovery device to recover the solvent and resin, and the high-value fibers left in the reactor are taken out.

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