A metal tube core nondestructive extraction device and extraction method for roll material waste

Abstract

The application relates to the technical field of aluminum foil recovery, and discloses a metal pipe core lossless extraction device and extraction method for coiled material waste, which comprises a base, the upper surface of the base is provided with a support frame at one end, an air expansion shaft is rotationally arranged on the support frame and used for penetrating into the pipe core of the coiled material, the upper surface of the base is provided with a mounting plate capable of moving up and down, two parallel support shafts are rotationally arranged on the mounting plate, support rollers are slidably arranged on the support shafts and used for supporting the coiled material; the technical principle of 'cavity layer-by-layer transfer' is adopted, the cavity is transferred to the space between the coiled material and the pipe core, the pipe core is extracted after the coiled material and the pipe core are separated from the closely fitted state, so that the end deformation and the inner cavity scratch of the pipe core are avoided, the lossless extraction of the metal pipe core is realized, the technical problem that the pipe core is easily damaged in the separation process is effectively solved, the pipe core can be repeatedly used after detection, and the production cost is obviously reduced.

Description

Technical Field

[0001] This invention relates to the field of aluminum foil recycling technology, specifically to a non-destructive extraction device and method for metal cores of rolled waste materials. Background Technology

[0002] During the production, processing, and use of aluminum foil rolls, as well as in the finishing and slitting stages and even in returns from downstream customers, a portion of waste aluminum foil is generated. This waste material is usually wound onto a stainless steel core to form a roll. To achieve resource recycling, the aluminum foil needs to be peeled off from the stainless steel core, and then the aluminum foil rolls without the stainless steel core are packaged as waste for recycling.

[0003] Currently, after recycling, waste aluminum foil rolls are usually separated from the core by mechanical cutting or mechanical ejection. For example, patent number CN201792191U (thin roll waste cutting and peeling machine) separates the core from the roll by cutting it open. However, mechanical cutting generates a large amount of aluminum dust, polluting the working environment, endangering the health of operators, and causing aluminum loss. Patent number CN221268995U (a waste roll core separation device) adopts a frame structure extending in the vertical direction. The ejector head is driven by a hydraulic cylinder to push the core downward from the hole in the lower steel plate. Although this solution improves the separation efficiency, the core directly bears the axial ejection force during the ejection process, and the end of the core is prone to deformation or damage, making the core unusable.

[0004] In addition, there are rotational friction separation methods and air shaft core pulling methods. Both of these methods require overcoming the friction between the core and the roll material to separate them. Not only is it easy to damage the inside of the core, making the core unusable, but the strong friction also causes the roll material to stick tightly to and remain on the outer surface of the core, resulting in material loss.

[0005] In summary, the aforementioned existing technologies all adopt the technical approach of "hard separation"—that is, to directly apply external force to the core or coil through mechanical cutting, ejection, torsion, or axial pulling to achieve separation. These methods generally suffer from problems such as easy damage to the core, large aluminum material loss, poor working environment, and many safety hazards. They are difficult to balance separation efficiency and core integrity, and cannot meet the actual needs of non-destructive extraction and reuse of the core. Summary of the Invention

[0006] The technical problem to be solved by this invention is to overcome the existing defects and provide a non-destructive extraction device and method for metal cores from rolled waste. It adopts the technical principle of "cavity layer-by-layer transfer," firstly, through the rotation of the rolled material and the squeezing action of the support rollers, the cavities between the layers of the rolled material are transferred layer by layer to the space between the rolled material and the core, until the cavities are transferred to the space between the rolled material and the core, causing the rolled material and the core to break away from their tight fit. Then, the core is extracted by the reverse movement of the rolled material and the core, thus avoiding deformation of the core end and scratches on the inner cavity, achieving non-destructive extraction of the metal core, effectively solving the technical problem of core damage during separation, allowing the core to be reused after inspection, significantly reducing production costs, and effectively solving the problems in the background technology.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a non-destructive extraction device for metal cores of rolled waste, comprising a base, a support frame mounted on one end of the upper surface of the base, an air expansion shaft rotatably mounted on the support frame for inserting into the core of the rolled material, a mounting plate capable of vertical movement on the upper surface of the base, two parallel support shafts rotatably mounted on the mounting plate, support rollers slidably mounted on the support shafts for supporting the rolled material, a horizontal drive component for driving the support rollers to move along the support shafts mounted on the mounting plate, a reduction motor for driving one of the support shafts to rotate on the mounting plate, one end of the support shaft being connected to the reduction motor, the reduction motor driving the support roller to rotate through the support shaft, the rotation of the support roller driving the rolled material to rotate, thereby transferring the cavities between the layers of the rolled material layer by layer to the space between the rolled material and the core, and several annular air hoods arranged along the axial direction of the support shafts mounted on the upper surface of the mounting plate via vertical plates, high-pressure air nozzles evenly distributed on the inner side of the annular air hoods for blowing high-pressure air onto the rolled material, causing the ends of the rolled material to adhere to the surface of the rolled material.

[0008] As a preferred embodiment of the present invention, the non-insertion end of the air expansion shaft is rotatably provided with a rotary joint, the rotary joint is mounted on a support frame by a bracket, the rotary joint is provided with a three-way pipe, the three-way pipe is provided with a three-way valve, and one of the ports of the three-way pipe is used to connect to an external high-pressure air pipeline.

[0009] As a preferred embodiment of the present invention, the upper surface of the base is provided with a hydraulic cylinder for driving the mounting plate to move up and down, and the telescopic end of the hydraulic cylinder is connected to the bottom of the mounting plate.

[0010] As a preferred embodiment of the present invention, the horizontal drive component includes a cylinder mounted on a mounting plate, the telescopic end of the cylinder is provided with a connecting rod, the end of the support roller away from the reduction motor is provided with an annular groove, a bearing is installed in the annular groove, and the connecting rod is fixedly connected to the outer ring of the bearing.

[0011] As a preferred technical solution of the present invention, several annular air hoods are connected by vent pipes. The end of the vent pipe near the geared motor is provided with a connecting pipe that is connected to an external high-pressure air pump. The external high-pressure air pump delivers high-pressure air into the annular air hood through the connecting pipe and the vent pipe.

[0012] A method for extracting the metal core of a waste roll material using a non-destructive extraction device includes the following steps: S1. Hoist the waste roll material onto the two support rollers, start the hydraulic cylinder to drive the mounting plate to move upward, so that the core of the roll material is coaxial with the air expansion shaft. S2. The control cylinder shortens, and the connecting rod drives the support roller to move along the support axis towards the support frame, so that the tube core is sleeved on the air expansion shaft. The high-pressure air in the external high-pressure air pipeline is injected into the air expansion shaft through the tee and rotary joint, so that the air expansion shaft tightens the tube core. S3. First, manually adjust the position of the end of the roll material to form a cavity between the end of the roll material and the outer peripheral surface of the roll material. Then, start the reduction motor to drive the two support rollers to rotate synchronously through the support shaft. The support rollers drive the roll material on them to rotate. During the rotation of the roll material, when the end of the roll material rotates to the support roller, under the squeezing action of the support roller, the cavity is transferred from the outermost layer of the roll material to the inner layer of the roll material layer by layer until the cavity is transferred between the roll material and the core, so that the roll material and the core are no longer tightly bonded. S4. After the roll material and the core are no longer tightly bonded, the control cylinder shortens the preset distance, causing the mounting plate to lower the support roller by 1-2mm. The roll material itself acts on the support roller under the action of gravity. Then, the control cylinder extends, and through the connecting rod, it drives the support roller to move away from the support frame along the support axis. The support roller drives the roll material on it to move, so that the roll material and the core are separated axially, completing the non-destructive extraction of the core.

[0013] As a preferred technical solution of the present invention, in S3, while the roll material is rotating, an external high-pressure air pump is started to supply air to each annular air hood through the connecting pipe and the air pipe. The high-pressure air is blown to the end of the roll material through the high-pressure air nozzle, so that the end of the roll material is attached to the outer peripheral surface of the roll material during the rotation process.

[0014] As a preferred technical solution of the present invention, in S4, after the roll material and the core are axially separated, the high-pressure air in the air expansion shaft is first discharged through the three-way pipe by adjusting the three-way valve to complete the venting of the air expansion shaft, so that the air expansion shaft and the core are separated from the tight state, and then the core can be removed from the air expansion shaft.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. The non-destructive extraction device and method for metal cores of waste roll material according to the present invention, wherein air is injected into the air expansion shaft through an external high-pressure air pipeline via a three-way pipe and a rotary joint, which can quickly expand the air expansion shaft to tighten the core; after separation, the high-pressure air in the air expansion shaft is discharged through the three-way pipe by adjusting the three-way valve, which can quickly complete the degassing and release the air expansion shaft from the core; the inflation and deflation and unloading operation of the air expansion shaft is convenient and responsive, which greatly improves the efficiency of core clamping and unloading; at the same time, after the air expansion shaft is inflated, the key strip expands outward evenly, which can automatically achieve precise alignment between the core and the air expansion shaft, ensuring the stability during the rotation of the roll material.

[0016] 2. In the non-destructive extraction device and method for metal core of waste roll material exemplified by this invention, during the process of transferring the cavity layer by layer inward, the outer end of the roll material will gradually shift as the roll material rotates. If it is not fixed, the end of the roll material is prone to gradually loosening during rotation, resulting in unwinding and failure of the cavity transfer process. This invention sets several annular air hoods arranged along the axial direction of the support shaft on the upper surface of the mounting plate. High-pressure air nozzles are evenly distributed on the inner side of the annular air hoods. While the roll material rotates, high-pressure air is continuously blown onto the end of the roll material through the high-pressure air nozzles, so that the end of the roll material is in real time attached to the outer peripheral surface of the roll material. The continuous action of high-pressure gas ensures that the end of the roll material remains in a attached state throughout the entire rotation process, effectively preventing unwinding and providing a reliable guarantee for the successful completion of the cavity layer-by-layer transfer process. This technical feature forms a close synergistic effect with the core process of "cavity transfer" - without the continuous air blowing and attachment of the annular air hoods, the roll material is very easy to unwind during the cavity transfer process, leading to failure of the entire separation process.

[0017] 3. The non-destructive extraction device and method for metal cores of waste roll material exemplified in this invention adopts the technical principle of "cavity layer-by-layer transfer". First, through the rotation of the roll material and the squeezing action of the support roller, the cavities between the layers of the roll material are transferred layer by layer to the space between the roll material and the core until the cavities are transferred to the space between the roll material and the core, so that the roll material and the core are no longer tightly attached. Then, the core is extracted by the reverse movement of the roll material and the core, thereby avoiding deformation of the core end and scratches on the inner cavity, realizing non-destructive extraction of metal cores, effectively solving the technical problem that the core is easily damaged during the separation process, allowing the core to be reused after inspection, and significantly reducing production costs. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the left-side structure of the present invention; Figure 3 This is a schematic diagram of the structure when the present invention is in use; Figure 4 This is a schematic diagram illustrating the working principle of the present invention.

[0019] In the diagram: 1. Base, 2. Support frame, 3. Air shaft, 31. Rotary joint, 32. T-pipe, 4. Mounting plate, 41. Oil cylinder, 5. Support shaft, 51. Gear motor, 6. Support roller, 7. Air cylinder, 71. Connecting rod, 72. Bearing, 8. Annular air cover, 81. Vent pipe, 82. High-pressure air nozzle. Detailed Implementation

[0020] 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.

[0021] Please see Figure 1-4 This invention provides a technical solution: a non-destructive extraction device for the metal core of waste roll material, comprising a base 1, a support frame 2 mounted on one end of the upper surface of the base 1, an air expansion shaft 3 rotatably mounted on the support frame 2 for inserting into the core of the roll material, a mounting plate 4 capable of vertical movement on the upper surface of the base 1, two parallel support shafts 5 rotatably mounted on the mounting plate 4, support rollers 6 slidably mounted on the support shafts 5 for supporting the roll material, a horizontal drive component mounted on the mounting plate 4 for driving the support rollers 6 to move along the support shafts 5, and a drive mechanism on the mounting plate 4 for driving the support rollers 6 to move along the support shafts 5. A geared motor 51 rotates on a support shaft 5. One end of the support shaft 5 is connected to the geared motor 51 for transmission. The geared motor 51 drives the support roller 6 to rotate through the support shaft 5. During the rotation of the support roller 6, the roll material rotates, thereby transferring the cavity between the roll material layers to the space between the roll material and the core. Several annular air hoods 8 arranged along the axial direction of the support shaft 5 are installed on the upper surface of the mounting plate 4 through vertical plates. The inner side of the annular air hoods 8 is provided with evenly distributed high-pressure air nozzles 82, which are used to blow high-pressure air onto the roll material, so that the ends of the roll material are attached to the surface of the roll material.

[0022] Furthermore, the non-insertion end of the air expansion shaft 3 is rotatably equipped with a rotary joint 31. The rotary joint 31 is mounted on the support frame 2 via a bracket. The rotary joint 31 is equipped with a three-way pipe 32, which is equipped with a three-way valve. One of the ports of the three-way pipe 32 is used to connect to an external high-pressure air pipeline. By inflating the air expansion shaft 3 through the external high-pressure air pipeline via the three-way pipe 32 and the rotary joint 31, the air expansion shaft 3 can quickly expand and tighten the tube core. After separation, the high-pressure air in the air expansion shaft 3 can be discharged through the three-way pipe 32 by adjusting the three-way valve, which can quickly complete the deflating and release the air expansion shaft 3 from the tube core. The inflation, deflation, and unloading operations of the air expansion shaft 3 are convenient and responsive, which greatly improves the efficiency of tube core clamping and unloading. At the same time, after the air expansion shaft 3 is inflated, the key strip expands outward evenly, which can automatically achieve precise alignment between the tube core and the air expansion shaft 3, ensuring the stability of the roll material during rotation.

[0023] Furthermore, the upper surface of the base 1 is provided with a hydraulic cylinder 41 that drives the mounting plate 4 to move up and down, and the telescopic end of the hydraulic cylinder 41 is connected to the bottom of the mounting plate 4.

[0024] Furthermore, the horizontal drive component includes a cylinder 7 mounted on the mounting plate 4. The telescopic end of the cylinder 7 is provided with a connecting rod 71. The end of the support roller 6 away from the reduction motor 51 is provided with an annular groove. A bearing 72 is installed in the annular groove. The connecting rod 71 is fixedly connected to the outer ring of the bearing 72.

[0025] Furthermore, several annular air hoods 8 are connected by vent pipes 81. One end of the vent pipe 81 near the geared motor 51 is connected to an external high-pressure air pump. The external high-pressure air pump delivers high-pressure air into the annular air hoods 8 through the connecting pipe and the vent pipe 81. During the process of transferring the cavity layer by layer inward, the outer end of the roll material will gradually shift as the roll material rotates. If not fixed, the end of the roll material is prone to gradually loosening during rotation, leading to unwinding and causing the cavity transfer process to fail. This invention addresses this by setting several annular air hoods 8 arranged along the axial direction of the support shaft 5 on the upper surface of the mounting plate 4. The inner side of the annular air hood 8 has evenly distributed high-pressure air nozzles 82. While the roll rotates, high-pressure air is continuously blown onto the end of the roll through the high-pressure air nozzles 82, so that the end of the roll is in real time attached to the outer peripheral surface of the roll. The continuous action of high-pressure gas ensures that the end of the roll remains in a closed state throughout the entire rotation process, effectively preventing the roll from unwinding. This provides a reliable guarantee for the smooth completion of the cavity layer-by-layer transfer process. This technical feature forms a close synergy with the core process of "cavity transfer" - without the continuous air blowing and contact of the annular air hood 8, the roll is very easy to unwind during the cavity transfer process, leading to the failure of the entire separation process.

[0026] A method for extracting the metal core of a waste roll material using a non-destructive extraction device includes the following steps: S1. Hoist the waste roll material onto the two support rollers 6, start the hydraulic cylinder 41 to drive the mounting plate 4 to move upward, so that the core of the roll material is coaxial with the air expansion shaft 3. S2. The control cylinder 7 shortens, and the connecting rod 71 drives the support roller 6 to move along the support shaft 5 towards the support frame 2, so that the tube core is sleeved on the air expansion shaft 3. The high-pressure air in the external high-pressure air pipeline is inflated into the air expansion shaft 3 through the three-way pipe 32 and the rotary joint 31, so that the air expansion shaft 3 inflates the tube core. S3. First, manually adjust the position of the ends of the roll material to create a cavity between the ends of the roll material and the outer peripheral surface of the roll material. Figure 4 a to Figure 4 b; Then start the reduction motor 51, which drives the two support rollers 6 to rotate synchronously via the support shaft 5. The support rollers 6 drive the roll material on them to rotate. During the rotation of the roll material, when the end of the roll material rotates to the support roller 6, under the squeezing action of the support roller 6, the cavity is transferred from the outermost layer of the roll material to the inner layer of the roll material layer by layer, such as Figure 4 From b to 4c, until the cavity is transferred between the roll material and the core, causing the roll material and the core to separate from the tightly bonded state, such as Figure 4 c to 4d; S4. After the roll material and the core are no longer tightly bonded, the control cylinder 41 shortens the preset distance, causing the mounting plate 4 to drive the support roller 6 to drop by 1-2mm. The roll material itself acts on the support roller 6 under the action of gravity. Then, the control cylinder 7 extends, and through the connecting rod 71, it drives the support roller 6 to move away from the support frame 2 along the support shaft 5. The support roller 6 drives the roll material on it to move, so that the roll material and the core are axially separated, completing the non-destructive extraction of the core.

[0027] Furthermore, in S3, while the roll material is rotating, an external high-pressure air pump is started to supply air to each annular air hood 8 through the connecting pipe and the air pipe 81. The high-pressure air is blown to the end of the roll material through the high-pressure air nozzle 82, so that the end of the roll material is attached to the outer peripheral surface of the roll material during the rotation process.

[0028] Furthermore, in S4, after the roll material and the core are axially separated, the high-pressure air in the air expansion shaft 3 is first discharged through the three-way pipe 32 by adjusting the three-way valve to complete the venting of the air expansion shaft 3, so that the air expansion shaft 3 is released from the core and the core is released from the tightened state. Then the core can be removed from the air expansion shaft 3.

[0029] Figure 4 a is a schematic diagram of the roll material placed on the support roller 6; Figure 4 b is a schematic diagram showing how the position of the end of the roll material is manually adjusted to create a cavity between the end of the roll material and the outer peripheral surface of the roll material; Figure 4 c is a schematic diagram showing the transfer of the cavity from the outermost layer of the roll material to the inner layer of the roll material; Figure 4d is a schematic diagram of the cavity being transferred between the roll material and the core.

[0030] The air shaft 3, rotary joint 31, oil cylinder 41, air cylinder 7, geared motor 51, high-pressure air pump, and various valve bodies involved in this invention are all well-known and mature components in the art. Their specific model selection, internal structure, working principle, and control method are well known to those skilled in the art and are not improvements of this invention. Therefore, their specific structure and circuit connection relationship will not be described in detail here. Those skilled in the art can fully understand and implement the technical solution described in this invention by reading this invention specification and combining it with common knowledge in the art.

[0031] This invention employs the technical principle of "cavity layer-by-layer transfer." First, through the rotation of the roll and the squeezing action of the support roller 6, the cavities between the roll layers are transferred layer by layer to the space between the roll and the core, until the cavities are transferred to the space between the roll and the core, causing the roll and the core to break away from their tight fit. Then, the core is extracted by the reverse movement of the roll and the core, thus avoiding deformation of the core end and scratches on the inner cavity. This achieves non-destructive extraction of the metal core, effectively solving the technical problem of the core being easily damaged during the separation process. The core can be reused after inspection, significantly reducing production costs.

[0032] All parts not disclosed in this invention are prior art, and their specific structures, materials, and working principles will not be described in detail. 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 variations 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 method for extracting the metal core of a roll waste material using a non-destructive extraction device, characterized in that: The non-destructive extraction device for the metal core of the waste roll material includes a base (1), a support frame (2) is installed on one end of the upper surface of the base (1), an air expansion shaft (3) is rotatably arranged on the support frame (2) for inserting into the core of the roll material, a rotary joint (31) is rotatably arranged on the non-insertion end of the air expansion shaft (3), the rotary joint (31) is installed on the support frame (2) by a bracket, a three-way pipe (32) is provided on the rotary joint (31), a three-way valve is provided on the three-way pipe (32), and one of the ports of the three-way pipe (32) is used to connect to an external high-pressure air pipeline; The upper surface of the base (1) is provided with a mounting plate (4) that can move up and down. The upper surface of the base (1) is provided with a hydraulic cylinder (41) that drives the mounting plate (4) to move up and down. The telescopic end of the hydraulic cylinder (41) is connected to the bottom of the mounting plate (4). Two parallel support shafts (5) are rotatably arranged on the mounting plate (4). A support roller (6) is slidably sleeved on the support shaft (5) for supporting the roll material. A horizontal drive component that drives the support roller (6) to move along the support shaft (5) is installed on the mounting plate (4). A reduction motor (51) that drives one of the support shafts (5) to rotate is provided on the mounting plate (4). The horizontal drive component includes a cylinder (7) installed on the mounting plate (4). A connecting rod (71) is provided at the telescopic end of the cylinder (7). An annular groove is opened at the end of the support roller (6) away from the reduction motor (51). A bearing (72) is installed in the annular groove. The connecting rod (71) is fixedly connected to the outer ring of the bearing (72). One end of the support shaft (5) is connected to the geared motor (51) for transmission. The geared motor (51) drives the support roller (6) to rotate through the support shaft (5). During the rotation of the support roller (6), the roll material rotates, thereby transferring the cavity between the layers of the roll material to the space between the roll material and the core. The upper surface of the mounting plate (4) is equipped with several annular air hoods (8) arranged along the axial direction of the support shaft (5) through the vertical plate. Several annular air hoods (8) are connected to each other through the ventilation pipe (81). The ventilation pipe (81) is provided with a connecting pipe connected to an external high-pressure air pump at one end near the geared motor (51). The external high-pressure air pump delivers high-pressure air to the inside of the annular air hood (8) through the connecting pipe and the ventilation pipe (81). The inner side of the annular air hood (8) is provided with evenly distributed high-pressure air nozzles (82) for blowing high-pressure air onto the roll material, so that the end of the roll material adheres to the surface of the roll material. The extraction method includes the following steps: S1. Hoist the waste roll material onto the two support rollers (6), start the oil cylinder (41) to drive the mounting plate (4) to move upward, so that the core of the roll material is coaxial with the air expansion shaft (3); S2. The control cylinder (7) shortens and drives the support roller (6) to move along the support shaft (5) towards the support frame (2) via the connecting rod (71), so that the tube core is sleeved on the air expansion shaft (3). The high-pressure air in the external high-pressure air pipeline is supplied to the air expansion shaft (3) through the three-way pipe (32) and the rotary joint (31), so that the air expansion shaft (3) tightens the tube core. S3. First, manually adjust the position of the end of the roll material to form a cavity between the end of the roll material and the outer peripheral surface of the roll material. Then, start the geared motor (51) and drive the two support rollers (6) to rotate synchronously through the support shaft (5). The support rollers (6) drive the roll material on them to rotate. While the roll material is rotating, start the external high-pressure air pump and supply air to each annular air cover (8) through the connecting pipe and the air pipe (81). The high-pressure air is blown to the end of the roll material through the high-pressure air nozzle (82) to keep the end of the roll material attached to the outer peripheral surface of the roll material during the rotation of the roll material. During the rotation of the roll material, when the end of the roll material rotates to the support roller (6), under the squeezing action of the support roller (6), the cavity is transferred from the outermost layer of the roll material to the inner layer of the roll material layer by layer until the cavity is transferred to the space between the roll material and the core, so that the roll material and the core material are separated from the tight fit. S4. After the roll material and the core are separated from the tight fit, the control cylinder (41) shortens the preset distance, so that the mounting plate (4) drives the support roller (6) to drop by 1-2mm. The roll material itself acts on the support roller (6) under the action of gravity. Then the control cylinder (7) extends and drives the support roller (6) to move away from the support frame (2) along the support shaft (5) through the connecting rod (71). The support roller (6) drives the roll material on it to move, so that the roll material and the core are separated axially, and the core is extracted without damage.

2. The extraction method of the non-destructive extraction device for metal cores of rolled waste according to claim 1, characterized in that: In S4, after the roll material and the core are axially separated, the high-pressure air in the air expansion shaft (3) is discharged through the three-way pipe (32) by adjusting the three-way valve to complete the venting of the air expansion shaft (3), so that the air expansion shaft (3) and the core are separated from the tight state, and then the core can be removed from the air expansion shaft (3).

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