A processing technology of a battery cell cover

Abstract

The application relates to a processing technology of a storage battery cover, which comprises the following steps: S1. metal piece processing; S2. plastic piece injection molding, reserving an opening hole corresponding to the position of the metal piece on an injection mold, arranging a plugging piece for plugging the opening hole on the injection mold, injecting molten plastic into the injection mold and keeping pressure; S3. plastic piece semi-forming, after keeping pressure is completed, fully cooling and shaping the part of the injection mold except the surrounding area of the opening hole to form a semi-finished plastic piece; S4. metal piece assembling, releasing the plugging of the opening hole by the plugging piece, cold cutting the part of the semi-formed plastic piece corresponding to the opening hole, and synchronously embedding the metal piece to obtain a semi-finished battery cover; S5. finished product shaping, rapidly cooling the semi-finished battery cover around the metal piece to obtain a finished battery cover, and taking out the finished battery cover. The application has the advantages of high assembling efficiency, low cost of matched processing equipment, low energy consumption, firm combination of the metal piece and the plastic piece, and good quality.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of battery accessory processing, and in particular to a processing technology for a battery cell cover. BACKGROUND

[0002] The battery cell cover mainly plays a protective and sealing role for the battery pack, and generally comprises a metal part and a plastic part, wherein the metal part mainly refers to a nut or an electrode sleeve. In the traditional process, there are mainly two ways to combine the metal part with the cover plate plastic part, the first way is to pre-drill holes on the plastic part, and then forcibly knock the nut into the hole through external force, but this way is easy to cause burrs on the cover plate and affect the forming quality of the plastic part, and if the hole is too large, the nut will also fall off the cover plate during use. The second way is to directly put the nut into the mold for producing the cover plate, and the nut is formed together with the cover plate, but this way takes a long time and has complicated requirements for the mold, and the nut is installed, which delays the production time of the cover plate, and thus prolongs the forming time of the whole product.

[0003] In the related art, a Chinese patent with the publication number CN112776354A proposes an automobile battery cover processing technology, which comprises the following steps: preparing the required metal part and plastic part in advance; fixing the metal part and the plastic part; heating the metal part, and the metal part and the plastic part move relative to each other and continuously contact; cooling the metal part after the metal part and the plastic part are combined; and taking out the combined metal part and plastic part. The metal part and the plastic part are produced separately, which reduces the intermediate operation and avoids reducing the production efficiency of the metal part or the plastic part; then the metal part is heated, the corresponding position of the plastic part is melted by the heat of the metal part, and finally cooling is performed to make the melted position of the plastic part re-solidify and be more tightly connected with the surface of the metal part.

[0004] The related art in the above has the following defects: considering the standardization of assembly, the installation position of the metal part on the plastic part is constant, and after the plastic part and the metal part are independently processed, the metal part and the plastic part need to be calibrated and positioned again. Compared with placing the metal part in the plastic part mold, although the processing difficulty of the plastic part is reduced, the processing efficiency of the cover plate assembly is not improved, but the assembly requirements are improved, and the energy consumption is also increased by melting the plastic part twice by heating the metal part, which increases the production cost. SUMMARY

[0005] In order to improve the low efficiency and waste of energy when assembling the metal part and the plastic part on the battery cover plate, the application provides a processing technology for a battery cell cover.

[0006] The processing technology for the battery cell cover provided by the application adopts the following technical scheme:

[0007] A processing technology of a battery cell cover, comprising the following steps:

[0008] S1. Metal piece processing;

[0009] S2. Plastic piece injection molding, reserving an opening corresponding to the position of the metal piece on the injection mold, then setting a blocking piece for blocking the opening on the injection mold, injecting molten plastic into the injection mold and keeping pressure;

[0010] S3. Plastic piece semi-forming, after keeping pressure, fully cooling and shaping the part of the injection mold except the area around the opening to form a semi-finished plastic piece;

[0011] S4. Metal piece assembly, unblocking the opening by the blocking piece, cold cutting the part of the semi-formed plastic piece corresponding to the opening, and synchronously embedding the metal piece to obtain a semi-finished battery cover;

[0012] S5. Product shaping, rapidly cooling the semi-finished battery cover around the metal piece to obtain a finished battery cover, and taking out the finished battery cover.

[0013] Further, the process of cold cutting the semi-formed plastic piece and synchronously embedding the metal piece in step S4 is realized by using a cold mounting device, which comprises a base, a cold mounting cylinder movably arranged on the base, a ring cutter coaxial with the cold mounting cylinder and mounted on the end of the cold mounting cylinder away from the base, a cooling mechanism arranged on the base for cooling the end of the cold mounting cylinder close to the ring cutter, and a suction member arranged in the cold mounting cylinder for adsorbing the metal piece.

[0014] Further, a driving mechanism is arranged on the base for driving the cold mounting cylinder to move towards / away from the base, and a guide mechanism is arranged on the base for guiding the movement of the cold mounting cylinder towards / away from the base.

[0015] Further, the driving mechanism comprises a magnetic pole block mounted on the end of the cold mounting cylinder close to the base and an electromagnet mounted on the base and corresponding to the magnetic pole block, and the magnetic pole of the electromagnet is adjustable.

[0016] Further, the guide mechanism comprises a plurality of guide rods arranged along the axial direction of the cold mounting cylinder and fixed to the cold mounting cylinder, the ends of the guide rods away from the cold mounting cylinder penetrate through the base, and the ends of the guide rods penetrating out of the base are provided with anti-dropping blocks.

[0017] Further, the suction member comprises a suction seat mounted on the base and slidingly arranged in the cold mounting cylinder, and a vacuum suction cup is arranged on the end of the suction seat away from the base.

[0018] Further, the ring cutter is arranged to rotate on the cold loading cylinder, and the adsorption seat is provided with a non-powered rotation structure for driving the ring cutter to rotate on the cold loading cylinder when the cold loading cylinder and the adsorption seat slide relative to each other.

[0019] Further, the non-powered rotation structure comprises a rotating cylinder fixed to the ring cutter and sleeved outside the adsorption seat, and a spiral groove opened on the outer circumferential side of the adsorption seat, and the inner wall of the rotating cylinder is fixed with a sliding convex matching the spiral groove.

[0020] Further, the ring cutter is provided with a sawtooth at one end away from the base.

[0021] Further, a high-frequency coil is wound in the middle of the cold loading cylinder, and the contact part of the cold loading cylinder with the high-frequency coil and the adsorption seat are made of insulating materials.

[0022] In summary, the beneficial technical effects of the present application are:

[0023] 1. Since the hole for installing the metal part is reserved in the injection mold, and the plastic part is cooled in zones, the plastic part with the metal part to be installed is maintained in a softened state, and the metal part can be conveniently installed on the semi-finished plastic part, without the need to reposition the metal part and the plastic part separately, which can significantly reduce the assembly difficulty of the metal part and the plastic part, improve the efficiency, and reduce the equipment configuration of the battery cover assembly line and the production cost.

[0024] 2. Moreover, when the metal part is inserted into the opening in the injection mold, the softened plastic can have good bonding effect with the metal part, so that the metal part on the formed battery cover has better bonding performance and high firmness, without the need for secondary heating, which effectively reduces energy consumption.

[0025] 3. The cold cutting is adopted when cutting the semi-finished plastic part where the metal part is to be installed, which can effectively avoid the phenomenon that the softened plastic is adhered to the cutting tool and the plastic cut is not neat. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a process flow schematic diagram of an embodiment of the present application.

[0027] Figure 2 is a cross-sectional structure schematic diagram of a cold loading device of an embodiment of the present application.

[0028] Figure 3 is a cross-sectional structure schematic diagram of a cold loading device of an embodiment of the present application provided with a high-frequency coil.

[0029] Mark No. : 1, base; 2, cold loading cylinder; 3, ring knife; 4, magnetic pole block; 5, electromagnet; 6, guide rod; 7, anti-dropping block; 8, adsorption seat; 9, vacuum chuck; 10, rotating cylinder; 11, spiral groove; 12, slide convex; 13, sawtooth; 14, high-frequency coil; 15, cooling cavity; 16, water supply pipe; 17, containing groove; 18, control rod; 19, bearing; 20, return pipe. DETAILED DESCRIPTION

[0030] The technical solutions of the present application will be clearly and completely described below with reference to the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0031] The embodiments of the present application disclose a processing technology of a storage battery cover. Referring to Figure 1 , the processing technology of the storage battery cover comprises the following steps:

[0032] S1. Metal piece processing, and sequentially discharging the manufactured metal pieces.

[0033] S2. Plastic piece injection molding, reserving an opening hole corresponding to the position of the metal piece on the injection mold, the opening hole penetrating through both sides of the injection mold, and then setting a plugging piece for plugging the opening hole on the injection mold, such as setting the plugging piece as a plugging sheet with the same material as the injection mold, integrally forming a plugging head adapted for plugging on the plugging sheet, driving two plugging sheets to respectively press on the injection mold by a linear driving piece such as a pneumatic cylinder or an electric push rod, and then injecting molten plastic into the injection mold and keeping pressure.

[0034] S3. Plastic piece semi-forming, after keeping pressure, fully cooling and shaping the part of the injection mold except the surrounding area of the opening hole to form a semi-finished plastic piece; when specifically setting, two sets of cooling systems are set on the injection mold, the first set of cooling systems cools the part of the injection mold except the surrounding area of the opening hole, and the second set of cooling systems is set in the surrounding area of the opening hole of the injection mold, and in this step, the first set of cooling systems is started at full power, and the second set of cooling systems is not started or started at half power, so that the plastic of the semi-finished plastic piece corresponding to the opening hole part of the injection mold is still in a softened state.

[0035] S4. Metal piece assembly, unblocking the opening hole by the plugging piece, cold cutting the part of the semi-formed plastic piece corresponding to the opening hole, and synchronously embedding the metal piece into the semi-finished battery cover, so as to realize the convenient and close combination of the metal piece and the semi-formed plastic piece by means of the softened plastic.

[0036] S5. The finished product is shaped, and the semi-finished battery cover on the side of the metal piece is quickly cooled to obtain the finished battery cover, which is mainly cooled and formed by the second cooling system in step S4, and the finished battery cover is taken out.

[0037] The first cooling system mentioned above is mainly liquid cooling and water cooling, and the second cooling system can be liquid cooling, water cooling, or air cooling.

[0038] After such setting, since the hole for installing the metal piece is reserved in the injection mold, and the plastic part is cooled in zones, the overall injection molding efficiency of the plastic part is ensured, and the plastic part that needs to install the metal piece is not cooled or less cooled to maintain the softened state. In this way, the metal piece can be directly inserted into the opening of the injection mold. On the one hand, it can realize convenient installation of the metal piece and the plastic part, and there is no need to reposition the metal piece and the plastic part. It only needs to align the metal piece with the opening on the injection mold, which can significantly reduce the assembly difficulty of the metal piece and the plastic part, improve the efficiency, and reduce the equipment configuration of the battery cover assembly line and the production cost. On the other hand, since the part of the plastic part that needs to install the metal piece is still in a softened state at this time, the softened plastic can have good adhesion with the metal piece when the metal piece is inserted into the opening of the injection mold, so that the combination of the metal piece and the plastic part on the molded battery cover is better and has high firmness, without the need for secondary heating, effectively reducing energy consumption. Thirdly, when assembling the metal piece, the plastic part is still in the injection mold as a whole, and the injection mold has good positioning and fixing effect on the semi-finished plastic part. At this time, when the metal piece is inserted into the opening, it will not cause excessive pulling of the softened plastic, which can effectively avoid the deformation or thickness thinning of the plastic caused by pulling the adjacent area of the plastic when embedding the metal piece in the plastic part.

[0039] Moreover, since the part of the semi-finished plastic part corresponding to the opening at this time is in a softened state, when cutting the semi-finished plastic part along the opening contour, on the one hand, the softened plastic is easy to adhere to the cutting tool, and on the other hand, the edge of the opening cut in the softened plastic is easy to elongate, which will cause the edge to be irregular. Therefore, cold cutting is adopted, so that the low-temperature cutting tool quickly cuts the softened plastic, and the metal piece is embedded at the same time, which can to some extent avoid the above-mentioned abnormalities and improve product quality.

[0040] In specific implementation, refer to Figure 2, the process of cold cutting the semi-finished plastic part and synchronously embedding the metal part in step S4 is realized by using a cold mounting device, which comprises a base 1, a cold mounting cylinder 2 movably arranged on the base 1, a ring cutter 3 coaxially arranged on the end of the cold mounting cylinder 2 away from the base 1, and the ring cutter 3 is tightly inserted into the opening of the injection mold; the base 1 is provided with a cooling mechanism for cooling the end of the cold mounting cylinder 2 close to the ring cutter 3, the cooling mechanism comprises a cooling water circulation system, a water supply pipe 16 and a backwater pipe 20 connected with the cooling water circulation system, and the end of the cold mounting cylinder 2 close to the ring cutter 3 is internally provided with a cooling cavity 15, the water supply pipe 16 and the backwater pipe 20 are both communicated with the cooling cavity 15; the base 1 is provided with a suction member arranged in the cold mounting cylinder 2 and used for sucking the metal part.

[0041] And, referring to Figure 2 , the base 1 is provided with a driving mechanism for driving the cold mounting cylinder 2 to move towards / away from the base 1, and the base 1 is provided with a guide mechanism for guiding the movement of the cold mounting cylinder 2 towards / away from the base 1; the driving mechanism comprises a magnetic pole block 4 arranged on the end of the cold mounting cylinder 2 close to the base 1 and an electromagnet 5 arranged on the base 1 and corresponding to the magnetic pole block 4, the magnetic pole block 4 is a magnet with the magnetic pole pointing to the base 1, and the magnetic pole of the electromagnet 5 is adjustable, for example, changing the current direction of the electromagnet 5 can change the magnetism of the side of the electromagnet 5 close to the magnetic pole block 4. And the guide mechanism comprises a plurality of guide rods 6 arranged along the axial direction of the cold mounting cylinder 2 and fixed to the cold mounting cylinder 2, the end of the guide rod 6 away from the cold mounting cylinder 2 penetrates through the base 1, and the end of the guide rod 6 penetrating through the base 1 is provided with an anti-dropping block 7, which can be fixed to the guide rod 6 or can be arranged as a nut screwed on the guide rod 6.

[0042] In this way, when it is needed to install a metal part on a semi-finished plastic part, the metal part is placed in the hollow part of the ring cutter 3, the suction member sucks the metal part, and then the base 1 is transferred to align the ring cutter 3 with the opening of the injection mold, the electromagnet 5 is started and the magnetism of the electromagnet 5 repels the magnetism of the magnetic pole block 4, at this time the cold mounting cylinder 2 moves on the base 1 relative to the suction seat 8, and the metal part sucked by the suction seat 8 is retracted into the cold mounting cylinder 2; the base 1 is driven to move to the position where the ring cutter 3 penetrates through the opening of the injection mold, and the ring cutter 3 cooled by the cooling mechanism cuts the semi-finished plastic part at a low temperature, the low-temperature ring cutter 3 contacts with the softened plastic, which can reduce the probability of the plastic adhering to the ring cutter 3, and also can ensure the flatness of the plastic cut, which is convenient for the metal part to be embedded neatly.

[0043] At the moment when the ring cutter 3 penetrates the opening of the injection mold, the magnetic pole of the electromagnet 5 is changed, so that the magnetism of the electromagnet 5 is attracted to the magnetism of the magnetic pole block 4. The cold mounting cylinder 2 quickly approaches the base 1 and exits from the injection mold. The metal part is still attached to the opening of the injection mold by the suction device and is wrapped by the softened plastic of the semi-finished plastic part. In this process, the metal part can also push out the softened plastic waste inside the ring cutter 3. Then, the suction device of the metal part is released, and the efficient and high-quality installation of the metal part on the plastic part is realized.

[0044] The power element for driving the cold mounting cylinder 2 to reciprocate on the base 1 is provided as the magnetic pole block 4 and the electromagnet 5 with switchable magnetic poles. Compared with the linear driving element such as the air cylinder, the electric cylinder, and the linear motor, the driving mechanism of the present application has a simpler structure and occupies a very small space, which is beneficial to the base 1 to pass through the gap of the body of the injection molding machine for processing plastic parts. Moreover, the magnetic repulsion and attraction force feedback of the electromagnet 5 and the magnetic pole block 4 is sensitive and quick, has large instantaneous energy, and has a certain buffer space, which can greatly shorten the time of the ring cutter 3 penetrating and exiting the softened plastic, and can further reduce the probability of the softened plastic adhering to the ring cutter 3. Moreover, the shorter the time of the ring cutter 3 staying in the softened plastic, the smaller the cooling effect on the softened plastic, which can also improve the problem that the low-temperature ring cutter 3 stays in the softened plastic for too long, causing the softened plastic cutout to be hardened by cooling and affecting the adhesion of the metal part and the plastic part.

[0045] Considering the actual setting, referring to Figure 2 , the suction device includes a suction seat 8 mounted on the base 1 and slidingly arranged in the cold mounting cylinder 2. The end of the suction seat 8 away from the base 1 is provided with a vacuum suction cup 9, and the vacuum suction cup 9 is in communication with an external air source.

[0046] In order to further reduce the probability of the softened plastic adhering to the ring cutter 3, referring to Figure 2 In another embodiment, the ring cutter 3 can be further rotatably arranged on the cold mounting cylinder 2 through a bearing 19, and the end of the ring cutter 3 away from the base 1 is provided with a sawtooth 13. The suction seat 8 is provided with a non-powered rotation structure for driving the ring cutter 3 to rotate on the cold mounting cylinder 2 when the cold mounting cylinder 2 and the suction seat 8 slide relative to each other. The non-powered rotation structure includes a rotating cylinder 10 fixedly connected with the ring cutter 3 and sleeved outside the suction seat 8, and a spiral groove 11 opened on the outer circumferential side of the suction seat 8. The inner wall of the rotating cylinder 10 is fixedly connected with a sliding convex 12 slidingly matched with the spiral groove 11. More specifically, the suction seat 8 can be provided as a cylindrical cam, and the sliding convex 12 fixedly connected to the inner wall of the rotating cylinder 10 is slidingly matched with the spiral groove 11 on the cylindrical cam.

[0047] After the setting, the base 1 moves to the metal piece and the semi-finished plastic piece, and the cold mounting cylinder 2 continues to move towards the injection mold under the driving of the driving mechanism, so that the cold mounting cylinder 2 moves away from the base 1 compared to the adsorption seat 8, and then the rotary cylinder 10 moves compared to the adsorption seat 8, the slide convex 12 on the ring cutter 3 drives the ring cutter 3 to rotate on the cold mounting cylinder 2 under the guide of the spiral groove 11 on the adsorption seat 8, so that the ring cutter 3 is in a rotating state when it penetrates into the softened plastic; similarly, the ring cutter 3 also exits in a reverse rotating state when it exits the softened plastic, so that the disturbance force of the ring cutter 3 on the softened plastic is partially dispersed along the tangential direction of the ring cutter 3, which can reduce the probability of the softened plastic adhering to the ring cutter 3; and the rotation direction of the ring cutter 3 when it penetrates and exits is opposite, which can also effectively remove a small amount of plastic adhering to the ring cutter 3.

[0048] Considering that under the condition of low ambient temperature, the softened plastic at the opening of the injection mold cools quickly, which may cause the softened plastic to harden when the metal piece is inserted, which is not conducive to the combination and fixation between the metal piece and the plastic piece. Therefore, in another possible embodiment, referring to Figure 3 , a high-frequency coil 14 is wound around the middle of the cold mounting cylinder 2, and correspondingly, the contact part of the cold mounting cylinder 2 and the high-frequency coil 14, the adsorption seat 8, the rotary cylinder 10 and the slide convex 12 are all made of insulating materials, such as ceramics or high-hardness engineering plastics, etc. And a receiving groove 17 for accommodating the vacuum suction cup 9 is formed on the adsorption seat 8, and a control rod 18 penetrating through the adsorption seat 8 and extending into the receiving groove 17 and fixedly connected with the vacuum suction cup 9 is arranged on the base 1, and a linear drive element, such as a micro linear motor, for driving the control rod 18 to slide on the adsorption seat 8 is also arranged on the base 1.

[0049] In this way, when the metal piece is adsorbed into the ring cutter 3 by the adsorption device, the driving mechanism drives the cold mounting cylinder 2 to move away from the base 1 to align the metal piece with the high-frequency coil 14, and the linear drive element drives the control rod 18 to drive the vacuum suction cup 9 to retract into the receiving groove 17, at this time the cold mounting cylinder 2 is in a horizontal state, and the metal piece will not fall off from the cold mounting cylinder 2; then the high-frequency coil 14 is powered on to heat the metal piece by using the principle of high-frequency heating, and in the subsequent process, when the driving mechanism drives the cold mounting cylinder 2 to move close to the base 1, the heated metal piece remains in the opening of the injection mold, which can form a relatively firm combination between the metal piece and the plastic piece.

[0050] Moreover, in order to improve the automation of the cold mounting device of the present application, the base 1 can be installed on a mechanical arm, and the base 1 and the cold mounting cylinder 2 thereon can be moved and grabbed by the mechanical arm to sequentially arrange the metal pieces, which can realize automatic feeding and assembly of the metal pieces.

[0051] The implementation principle of the processing technology of the battery cover according to the embodiment of the application is as follows: a hole for mounting the metal part is reserved in the injection mold, and the plastic part is cooled in sections, so that the plastic part to be mounted with the metal part is maintained in a softened state; when the metal part is mounted on the semi-finished plastic part, the metal part is placed in the hollow part of the ring cutter 3, the metal part is adsorbed by the adsorption accessory, the base 1 is transferred to the ring cutter 3 and the opening in the injection mold is aligned, the electromagnet 5 is started and the magnetism of the electromagnet 5 repels the magnetism of the magnetic pole block 4, at this time, the cold loading cylinder 2 moves on the base 1 relative to the adsorption seat 8, and the metal part adsorbed by the adsorption seat 8 is retracted into the cold loading cylinder 2; the base 1 is driven to move to the ring cutter 3 to pass through the opening in the injection mold, the ring cutter 3 cooled by the cooling mechanism cuts the hole in the semi-finished plastic part at a low temperature, the low-temperature ring cutter 3 contacts the softened plastic, which can reduce the probability of the plastic sticking to the ring cutter 3, and also ensures the flatness of the plastic cutout, facilitates the neat embedding of the metal part, and can significantly improve the processing quality of the battery cover.

[0052] When the metal part is assembled on the plastic part, it is not necessary to reposition the metal part and the plastic part respectively, which can significantly reduce the assembly difficulty of the metal part and the plastic part, improve the efficiency, reduce the equipment configuration of the battery cover assembly line, and reduce the production cost; when the metal part is inserted into the opening in the injection mold, the softened plastic can have good adhesion with the metal part, so that the metal part and the plastic part of the formed battery cover have better combination performance and high firmness, without the need for secondary heating, which effectively reduces the energy loss.

Claims

1. A process for machining a battery cell cover, characterized in that, The method comprises the following steps: S1. metal piece processing; S2. plastic injection molding, reserving a hole corresponding to the position of the metal piece on the injection mold, then setting a blocking piece for blocking the hole on the injection mold, injecting molten plastic into the injection mold and maintaining pressure; S3. plastic piece semi-forming, after maintaining pressure, fully cooling and shaping the part of the injection mold except the area around the hole to form a semi-finished plastic piece; S4. metal piece assembly, unblocking the hole by the blocking piece, cold cutting the part of the semi-finished plastic piece corresponding to the hole, and synchronously embedding the metal piece to obtain a semi-finished battery cover; S5. finished product shaping, rapidly cooling the semi-finished battery cover around the metal piece to obtain a finished battery cover, and taking out the finished battery cover; the process of cold cutting the semi-finished plastic piece and synchronously embedding the metal piece in step S4 is realized by using a cold loading device, the cold loading device comprises a base (1), a cold loading cylinder (2) movably arranged on the base (1), an annular cutter (3) coaxial with the base (1) and installed at one end of the cold loading cylinder (2) away from the base (1), a cooling mechanism arranged on the base (1) for cooling the end of the cold loading cylinder (2) close to the annular cutter (3), and a suction member arranged in the cold loading cylinder (2) and used for suctioning the metal piece; a driving mechanism is arranged on the base (1) for driving the cold loading cylinder (2) to move towards / away from the base (1), and a guide mechanism is arranged on the base (1) for guiding the movement of the cold loading cylinder (2) towards / away from the base (1).

2. The process of claim 1, wherein, The driving mechanism comprises a magnetic pole block (4) installed at one end of the cold loading cylinder (2) close to the base (1) and an electromagnet (5) installed on the base (1) and corresponding to the magnetic pole block (4), and the magnetic pole of the electromagnet (5) is adjustable.

3. The process of claim 2, wherein, The guide mechanism comprises a plurality of guide rods (6) arranged in the axial direction of the cold loading cylinder (2) and fixed to the cold loading cylinder (2), one end of each guide rod (6) away from the cold loading cylinder (2) penetrates the base (1), and a anti-dropping block (7) is installed at the end of each guide rod (6) penetrating the base (1).

4. The process of claim 1, wherein, The suction member comprises a suction seat (8) installed on the base (1) and slidingly arranged in the cold loading cylinder (2), and a vacuum suction disc (9) is arranged at one end of the suction seat (8) away from the base (1).

5. The process of claim 4, wherein, The annular cutter (3) is rotationally arranged on the cold loading cylinder (2), and the suction seat (8) is provided with a non-powered rotation structure for driving the annular cutter (3) to rotate on the cold loading cylinder (2) when the cold loading cylinder (2) and the suction seat (8) slide relative to each other.

6. The process of claim 5, wherein, The non-powered rotation structure comprises a rotating cylinder (10) fixed to the annular cutter (3) and sleeved outside the suction seat (8), and a spiral groove (11) opened on the outer circumferential side of the suction seat (8), and a slide convexity (12) is fixed to the inner wall of the rotating cylinder (10) and slidingly matched with the spiral groove (11).

7. The process of claim 6, wherein, The ring cutter (3) is provided with a sawtooth (13) at one end away from the base (1).

8. The process of claim 4, wherein, The high-frequency coil (14) is wound in the middle of the cold loading cylinder (2), and the contact part of the cold loading cylinder (2) and the high-frequency coil (14) and the adsorption seat (8) are made of insulating materials.

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