A disassembly and maintenance method for a screw extruder

Abstract

The invention discloses a disassembly and maintenance method for a screw extruder, which relates to the technical field of extruder maintenance and comprises the following steps: S1: opening a cover plate above a feed chamber of the screw extruder so that the cavity opening of the feed chamber is opened and the screw of the screw extruder is exposed; S2: placing an auxiliary part made of a non-metallic material from the cavity opening into a spiral groove of the screw corresponding to the cavity opening; S3: removing a coupling of the screw extruder, pulling out the screw, and maintaining the screw; S4: installing the screw into a cavity bushing of the screw extruder. After assembly is completed, taking out the auxiliary part from the cavity opening, closing the cover plate above the feed chamber of the screw extruder, and completing the disassembly and maintenance of the screw extruder. The invention solves the technical problem in the prior art that metal chips are easily generated during screw assembly or disassembly during maintenance, which makes maintenance time-consuming, labor-intensive, and costly.

Description

Technical Field

[0001] The invention relates to the technical field of extruder maintenance, in particular to a disassembly and maintenance method for a screw extruder. Background Art

[0002] Currently, lithium-ion batteries are a type of secondary battery (rechargeable battery) that primarily relies on the movement of lithium ions between the positive and negative electrodes to operate. During the charge and discharge process, Li+ is intercalated and deintercalated back and forth between the two electrodes: during charging, Li+ is deintercalated from the positive electrode and intercalated into the negative electrode through the electrolyte, leaving the negative electrode in a lithium-rich state; the opposite is true during discharge. The lithium battery cell slurry mixing and dispersion process has a significant impact on product quality throughout the entire lithium-ion battery production process and is the most important link in the entire production process. In the manufacture of lithium-ion battery electrodes, the positive electrode slurry is composed of a binder, a conductive agent, a positive electrode material, etc.; the negative electrode slurry is composed of a binder, a negative electrode material, etc. The preparation of both positive and negative electrode slurries includes a series of process steps such as mixing, dissolving, and dispersing liquids and solid materials. In the positive and negative electrode slurries, the dispersion and uniformity of the granular active material directly affect the movement of lithium ions between the two poles of the battery. Therefore, the mixing and dispersion of the slurries of various electrode materials is crucial in the production of lithium-ion batteries. The quality of the slurry dispersion directly affects the quality of subsequent lithium-ion battery production and the performance of its products.

[0003] In the production process of lithium battery cells, the front-end process will use a slurry method to mix the powder material with the liquid solvent, and then transport it to the next coating process for the production of battery cell electrodes.

[0004] At present, a solution of using twin-screw extruders has emerged for mixing lithium battery slurry. Compared with other mixing methods, using twin-screw extruders for slurry mixing can achieve better uniformity and higher output.

[0005] During the assembly and maintenance of twin-screw extruders, the screw rotor is typically extracted as a whole, rather than the chamber itself. Due to the relatively small clearance between the screw rotor and the inner sleeve of the chamber, friction between the rotor and the inner sleeve occurs during the extraction process, generating impurities such as iron shavings. In the lithium battery industry, these impurities can contaminate lithium battery slurry. The current practice is to rinse the interior of the chamber with a dedicated detergent after assembly and maintenance to reduce the iron and other metal content to a certain level. This maintenance method is time-consuming, labor-intensive, and inefficient. Summary of the Invention

[0006] The purpose of the present invention is to provide a disassembly and maintenance method for a screw extruder, which solves the technical problem in the prior art that metal chips are easily generated when the screw is assembled or disassembled during maintenance, making the maintenance time-consuming, labor-intensive and costly.

[0007] The present invention discloses a method for disassembling and maintaining a screw extruder, comprising the following steps:

[0008] S1: Open the cover plate above the feed chamber of the screw extruder, so that the cavity opening of the feed chamber is opened to expose the screw of the screw extruder;

[0009] S2: placing the auxiliary part made of non-metallic material from the cavity opening into the spiral groove of the screw corresponding to the cavity opening;

[0010] S3: dismantling the coupling of the screw extruder, pulling out the screw, and performing maintenance on the screw;

[0011] S4: Install the screw into the cavity bushing of the screw extruder to ensure that the direction and position of the screw are correct. After the assembly is completed, remove the auxiliary parts from the cavity mouth, close the cover above the feed cavity of the screw extruder, and complete the disassembly and maintenance of the screw extruder.

[0012] The present application adds non-metallic auxiliary parts to replace the original direct contact between the screw and the cavity bushing, thereby reducing metal chips, thereby reducing subsequent maintenance costs and improving maintenance efficiency.

[0013] Based on the above technical solution, the embodiment of the present application can also be improved as follows:

[0014] Furthermore, the step S2 is specifically as follows:

[0015] S201: placing a plurality of the auxiliary components in the spiral groove of the screw in sequence along the circumferential direction of the screw;

[0016] S202: Rotate the screw so that the top wall of the auxiliary part contacts the inner wall of the cavity bushing; the beneficial effect of adopting this step is that by rotating the screw, the auxiliary part can be stably assembled into the screw groove, avoiding direct contact between the screw and the cavity bushing.

[0017] Furthermore, in the step S2, in the step S202, the angle of rotation of the screw is α, 0°<α≤180°. The beneficial effect of adopting this step is that by controlling the rotation angle, the efficiency during assembly can be guaranteed.

[0018] Furthermore, in step S202, the angle of rotation of the screw is 90°. The beneficial effect of adopting this step is to ensure the convenience of workers during operation through the corresponding rotation angle, while avoiding direct contact between the screw and the cavity bushing.

[0019] Furthermore, the auxiliary part is spiral-shaped. The beneficial effect of adopting this step is that the auxiliary part can be better installed into the screw through the spiral structure.

[0020] Furthermore, the outer diameter of the top wall of the auxiliary part is D1, the groove top diameter of the screw is D2, the inner diameter of the cavity bushing is D3, D2<D1<D3. The beneficial effect of adopting this step is to design the size of the auxiliary part so as to protect the screw without affecting the disassembly and assembly.

[0021] Furthermore, the top wall of the auxiliary component is an arc-shaped surface. The beneficial effect of adopting this step is that the outer side of the screw can be better protected by the arc-shaped auxiliary component.

[0022] Furthermore, the inner diameter of the auxiliary part is consistent with the bottom diameter of the spiral groove of the screw. The beneficial effect of adopting this step is to facilitate the assembly of the auxiliary part.

[0023] Furthermore, in step S3, when maintaining the screw, ensure that the auxiliary part is inside the spiral groove, or when maintaining, remove the auxiliary part and record the corresponding position or mark it. After the maintenance is completed, re-install the auxiliary part into the spiral groove of the screw according to the record or mark; the beneficial effect of adopting this step is to facilitate the subsequent screw assembly, and it is inconvenient to remove the auxiliary part subsequently if the corresponding spiral groove cannot be accurately found.

[0024] Furthermore, in step S4, after the screw is assembled, the auxiliary part corresponds to the cavity opening. The beneficial effect of this step makes it easier for the staff to remove the corresponding auxiliary part from the cavity opening.

[0025] One or more technical solutions provided in this application have at least the following technical effects or advantages:

[0026] During maintenance, the present application first provides an auxiliary part inside the spiral groove of the screw, and the top wall of the auxiliary part contacts the inner wall of the cavity sleeve, so that during the process of the screw rotor being pulled out / pushed in, the screw rotor and the cavity sleeve are not in direct contact, so that impurities such as iron cuttings will not be generated. After the assembly and maintenance process, there is no need to specially clean the inside of the cavity, which saves time and effort and improves efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 This is a structural diagram of an auxiliary component in a specific embodiment of the present invention;

[0029] Reference numerals:

[0030] 1- Auxiliary parts. DETAILED DESCRIPTION

[0031] The following embodiments of the technical solution of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are therefore only examples and are not intended to limit the scope of protection of the present invention.

[0032] It should be noted that, unless otherwise specified, the technical or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0033] In the description of this application, it should be understood that the terms "top", "bottom", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0034] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0035] In order to better understand the above technical solution, the above technical solution will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0036] The existing disassembly and maintenance method of screw extruders is that experienced staff will slowly pull out the screw synchronously, that is, directly disassemble it and then perform maintenance later; however, the screw and cavity bushing of the extruder are metal parts. When pulling out or inserting, they will more or less collide and produce metal chips. At this time, a special detergent is needed to flush the inside of the cavity to reduce the content of iron metal to a certain value before starting to use;

[0037] This embodiment provides a method for disassembling and maintaining a screw extruder. A corresponding non-metallic auxiliary part is added inside the spiral groove of the screw. The material can be PTFE, PEK, PEEK, or other similar materials. The specific structure is as follows: Figure 1 As shown, the gap between the screw and the cavity bushing is filled, so that when the screw is pulled out or inserted, the screw will not come into direct contact with the cavity bushing, which can effectively reduce the generation of metal chips and improve production efficiency.

[0038] Example 1:

[0039] The present invention discloses a method for disassembling and maintaining a screw extruder, comprising the following steps:

[0040] S1: Open the cover plate above the feed chamber of the screw extruder, so that the cavity of the feed chamber is opened and the screw of the screw extruder is exposed. The screw extruder can be a single-screw extruder or a twin-screw extruder;

[0041] S2: placing the auxiliary part made of non-metallic material from the cavity opening into the spiral groove of the screw corresponding to the cavity opening;

[0042] S3: Remove the coupling of the screw extruder, pull out the screw, and perform maintenance on the screw; during maintenance, ensure that the auxiliary component is inside the spiral groove to facilitate subsequent screw insertion and assembly;

[0043] S4: Install the screw into the cavity sleeve of the screw extruder to ensure that the direction and position of the screw are correct. After the assembly is completed, the auxiliary part corresponds to the cavity mouth, and then the auxiliary part is taken out from the cavity mouth, and the cover above the feed cavity of the screw extruder is closed to complete the disassembly and maintenance of the screw extruder.

[0044] The maintenance in step S3 of the embodiment of the present application can be an existing conventional screw maintenance method.

[0045] The following is a further explanation of the specific structure of the auxiliary part: the auxiliary part replaces the contact between the top wall of the screw and the cavity sleeve, thereby effectively reducing the generation of metal chips. Furthermore, the auxiliary part can be made of non-metallic material, so that metal chips will not be generated even after long-term basic wear; the auxiliary part can be an elastic part or a non-elastic part.

[0046] The auxiliary part in the embodiment of the present application is spiral-shaped, so that it can be better assembled into the assembly groove of the screw; at the same time, the top wall of the auxiliary part is an arc-shaped surface, which cooperates with the inner wall of the cavity sleeve, and the two contact and cooperate with each other, so that no interference will occur when the screw is inserted or withdrawn.

[0047] Specifically, the outer diameter of the top wall of the auxiliary part is D1, the groove top diameter of the screw is D2, and the inner diameter of the cavity sleeve is D3, D2<D1<D3. By controlling the size of the top wall of the auxiliary part, the auxiliary part can solve the technical problem of this application while also being assembled inside the cavity sleeve.

[0048] Specifically, the inner diameter of the auxiliary part is consistent with the bottom diameter of the spiral groove of the screw, which can ensure that the auxiliary part can be assembled stably and the screw will not shake when being pulled out or inserted, causing it to fall off and affecting the entire cavity.

[0049] The embodiment of the present application adds auxiliary parts so that the screw does not directly contact the cavity bushing during the process of being pulled out / pushed in, so that impurities such as iron cuttings will not be generated due to the friction between the screw and the bushing. After the assembly and maintenance process, there is no need to specially clean the inside of the cavity, which saves time and effort and improves efficiency.

[0050] Example 2:

[0051] The present invention discloses a method for disassembling and maintaining a screw extruder, comprising the following steps:

[0052] S1: Open the cover plate above the feed chamber of the screw extruder, so that the cavity of the feed chamber is opened and the screw of the screw extruder is exposed. The screw extruder can be a single-screw extruder or a twin-screw extruder;

[0053] S2: placing the auxiliary part made of non-metallic material from the cavity opening into the spiral groove of the screw corresponding to the cavity opening. The specific steps are as follows:

[0054] S201: placing a plurality of the auxiliary components in the spiral groove of the screw in sequence along the circumferential direction of the screw;

[0055] S202: rotating the screw so that the top wall of the auxiliary component contacts the inner wall of the cavity liner;

[0056] In step S202 , when the screw is rotated, the angle of rotation is 30°, so that part of the top wall of the auxiliary component contacts the side surface of the cavity liner;

[0057] S3: Remove the coupling of the screw extruder, pull out the screw, and perform maintenance on the screw; during maintenance, ensure that the auxiliary component is inside the spiral groove to facilitate subsequent screw insertion and assembly;

[0058] S4: Install the screw into the cavity sleeve of the screw extruder to ensure that the direction and position of the screw are correct. After the assembly is completed, the auxiliary part corresponds to the cavity mouth, and then the auxiliary part is taken out from the cavity mouth, and the cover above the feed cavity of the screw extruder is closed to complete the disassembly and maintenance of the screw extruder.

[0059] The maintenance in step S3 of the embodiment of the present application can be an existing conventional screw maintenance method.

[0060] The following is a further explanation of the specific structure of the auxiliary part: the auxiliary part replaces the contact between the top wall of the screw and the cavity sleeve, thereby effectively reducing the generation of metal chips. Furthermore, the auxiliary part can be made of non-metallic material, so that metal chips will not be generated even after long-term basic wear; the auxiliary part can be an elastic part or a non-elastic part.

[0061] The auxiliary part in the embodiment of the present application is spiral-shaped, so that it can be better assembled into the assembly groove of the screw; at the same time, the top wall of the auxiliary part is an arc-shaped surface, which cooperates with the inner wall of the cavity sleeve, and the two contact and cooperate with each other, so that no interference will occur when the screw is inserted or withdrawn.

[0062] Specifically, the outer diameter of the top wall of the auxiliary part is D1, the groove top diameter of the screw is D2, and the inner diameter of the cavity sleeve is D3, D2<D1<D3. By controlling the size of the top wall of the auxiliary part, the auxiliary part can solve the technical problem of this application while also being assembled inside the cavity sleeve.

[0063] Specifically, the inner diameter of the auxiliary part is consistent with the bottom diameter of the spiral groove of the screw, which can ensure that the auxiliary part can be assembled stably and the screw will not shake when being pulled out or inserted, causing it to fall off and affecting the entire cavity.

[0064] The embodiment of the present application adds auxiliary parts so that the screw does not directly contact the cavity bushing during the process of being pulled out / pushed in, so that impurities such as iron cuttings will not be generated due to the friction between the screw and the bushing. After the assembly and maintenance process, there is no need to specially clean the inside of the cavity, which saves time and effort and improves efficiency.

[0065] Example 3:

[0066] The embodiment of the present application is a further improvement based on embodiment 2, and specifically includes the following steps:

[0067] S1: Open the cover plate above the feed chamber of the screw extruder, so that the cavity of the feed chamber is opened and the screw of the screw extruder is exposed. The screw extruder can be a single-screw extruder or a twin-screw extruder;

[0068] S2: placing the auxiliary part made of non-metallic material from the cavity opening into the spiral groove of the screw corresponding to the cavity opening. The specific steps are as follows:

[0069] S201: placing a plurality of the auxiliary components in the spiral groove of the screw in sequence along the circumferential direction of the screw;

[0070] S202: rotating the screw so that the top wall of the auxiliary component contacts the inner wall of the cavity liner;

[0071] In step S202, when the screw is rotated, the rotation angle is 180 degrees, so that part of the top wall of the auxiliary member contacts the side of the cavity liner; so that the top wall of the auxiliary member contacts the bottom of the cavity liner;

[0072] This ensures full contact and fully supports the screw. Because the screw has a certain weight, it will form downward pressure. It can also ensure that the auxiliary parts can be completely located in the spiral groove of the screw and are not easy to fall off, thereby better reducing the generation of iron or metal chips.

[0073] S3: Remove the coupling of the screw extruder, pull out the screw, and maintain the screw; during maintenance, remove the auxiliary parts and record the corresponding positions or mark them. After the maintenance is completed, reinstall the auxiliary parts according to the records or marks.

[0074] S4: Install the screw into the cavity sleeve of the screw extruder. After assembly, the auxiliary part corresponds to the cavity opening, and then take out the auxiliary part from the cavity opening, close the cover plate above the feed cavity of the screw extruder, and complete the disassembly and maintenance of the screw extruder.

[0075] The maintenance in step S3 of the embodiment of the present application can be an existing conventional screw maintenance method.

[0076] The following is a further explanation of the specific structure of the auxiliary part: the auxiliary part replaces the contact between the top wall of the screw and the cavity sleeve, thereby effectively reducing the generation of metal chips. Furthermore, the auxiliary part can be made of non-metallic material, so that metal chips will not be generated even after long-term basic wear; the auxiliary part can be an elastic part or a non-elastic part.

[0077] The auxiliary part in the embodiment of the present application is spiral-shaped, so that it can be better assembled into the assembly groove of the screw; at the same time, the top wall of the auxiliary part is an arc-shaped surface, which cooperates with the inner wall of the cavity sleeve, and the two contact and cooperate with each other, so that no interference will occur when the screw is inserted or withdrawn.

[0078] Specifically, the outer diameter of the top wall of the auxiliary part is D1, the groove top diameter of the screw is D2, and the inner diameter of the cavity sleeve is D3, D2<D1<D3. By controlling the size of the top wall of the auxiliary part, the auxiliary part can solve the technical problem of this application while also being assembled inside the cavity sleeve.

[0079] Specifically, the inner diameter of the auxiliary part is consistent with the bottom diameter of the spiral groove of the screw, which can ensure that the auxiliary part can be assembled stably and the screw will not shake when being pulled out or inserted, causing it to fall off and affecting the entire cavity.

[0080] The embodiment of the present application adds auxiliary parts so that the screw does not directly contact the cavity bushing during the process of being pulled out / pushed in, so that impurities such as iron cuttings will not be generated due to the friction between the screw and the bushing. After the assembly and maintenance process, there is no need to specially clean the inside of the cavity, which saves time and effort and improves efficiency.

[0081] Example 4:

[0082] The embodiment of the present application is a further improvement based on embodiment 2, and specifically includes the following steps:

[0083] S1: Open the cover plate above the feed chamber of the screw extruder, so that the cavity of the feed chamber is opened and the screw of the screw extruder is exposed. The screw extruder can be a single-screw extruder or a twin-screw extruder;

[0084] S2: placing the auxiliary part made of non-metallic material from the cavity opening into the spiral groove of the screw corresponding to the cavity opening. The specific steps are as follows:

[0085] S201: placing a plurality of the auxiliary components in the spiral groove of the screw in sequence along the circumferential direction of the screw;

[0086] S202: rotating the screw so that the top wall of the auxiliary component contacts the inner wall of the cavity liner;

[0087] In step S202, when the screw is rotated, the rotation angle is 90°, so that a portion of the top wall of the auxiliary member contacts the bottom of the cavity liner, and a portion of the top wall of the auxiliary member contacts the side of the cavity liner;

[0088] In this way, full contact can be achieved and the screw can be fully supported, that is, the weight of the screw is utilized to complete the downward pressure, ensuring that the auxiliary parts can be completely located in the spiral groove of the screw and are not easy to fall off, thereby better reducing the generation of iron or metal chips; at the same time, the amplitude of the screw rotation is small, which is convenient for workers to operate. If the auxiliary parts are too much at the bottom, due to the weight of the screw, the friction is too large, which is not conducive to workers' operation.

[0089] This ensures full contact and fully supports the screw. Because the screw has a certain weight, it will form downward pressure. It can also ensure that the auxiliary parts can be completely located in the spiral groove of the screw and are not easy to fall off, thereby better reducing the generation of iron or metal chips.

[0090] S3: Remove the coupling of the screw extruder, pull out the screw, and maintain the screw; during maintenance, remove the auxiliary parts and record the corresponding positions or mark them. After the maintenance is completed, reinstall the auxiliary parts according to the records or marks.

[0091] S4: Install the screw into the cavity sleeve of the screw extruder. After assembly, the auxiliary part corresponds to the cavity opening, and then take out the auxiliary part from the cavity opening, close the cover plate above the feed cavity of the screw extruder, and complete the disassembly and maintenance of the screw extruder.

[0092] The maintenance in step S3 of the embodiment of the present application can be an existing conventional screw maintenance method.

[0093] The following is a further explanation of the specific structure of the auxiliary part: the auxiliary part replaces the contact between the top wall of the screw and the cavity sleeve, thereby effectively reducing the generation of metal chips. Furthermore, the auxiliary part can be made of non-metallic material, so that metal chips will not be generated even after long-term basic wear; the auxiliary part can be an elastic part or a non-elastic part.

[0094] The auxiliary part in the embodiment of the present application is spiral-shaped, so that it can be better assembled into the assembly groove of the screw; at the same time, the top wall of the auxiliary part is an arc-shaped surface, which cooperates with the inner wall of the cavity sleeve, and the two contact and cooperate with each other, so that no interference will occur when the screw is inserted or withdrawn.

[0095] Specifically, the outer diameter of the top wall of the auxiliary part is D1, the groove top diameter of the screw is D2, and the inner diameter of the cavity sleeve is D3, D2<D1<D3. By controlling the size of the top wall of the auxiliary part, the auxiliary part can solve the technical problem of this application while also being assembled inside the cavity sleeve.

[0096] Specifically, the inner diameter of the auxiliary part is consistent with the bottom diameter of the spiral groove of the screw, which can ensure that the auxiliary part can be assembled stably and the screw will not shake when being pulled out or inserted, causing it to fall off and affecting the entire cavity.

[0097] The embodiment of the present application adds auxiliary parts so that the screw does not directly contact the cavity bushing during the process of being pulled out / pushed in, so that impurities such as iron cuttings will not be generated due to the friction between the screw and the bushing. After the assembly and maintenance process, there is no need to specially clean the inside of the cavity, which saves time and effort and improves efficiency.

[0098] In the description of the present invention, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures, and techniques are not shown in detail so as not to obscure the understanding of this description.

[0099] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention.

Claims

1. A method for disassembling and maintaining a screw extruder, characterized in that: The following steps are involved: S1: Open the cover plate above the feed chamber of the screw extruder, so that the cavity opening of the feed chamber is opened to expose the screw of the screw extruder; S2: placing the auxiliary part made of non-metallic material from the cavity opening into the spiral groove of the screw corresponding to the cavity opening; the specific details of step S2 are as follows: S201: placing a plurality of the auxiliary components in the spiral groove of the screw in sequence along the circumferential direction of the screw; S202: rotating the screw so that the top wall of the auxiliary component contacts the inner wall of the cavity liner; S3: dismantling the coupling of the screw extruder, pulling out the screw, and performing maintenance on the screw; S4: Install the screw into the cavity bushing of the screw extruder to ensure that the direction and position of the screw are correct. After the assembly is completed, remove the auxiliary parts from the cavity mouth, close the cover above the feed cavity of the screw extruder, and complete the disassembly and maintenance of the screw extruder.

2. The disassembly and maintenance method according to claim 1, characterized in that: In the step S2, in the step S202, the angle of rotation of the screw is α, 0°<α≤180°.

3. The disassembly and maintenance method according to claim 1, characterized in that: In step S202, the screw rotates at an angle of 90°.

4. The disassembly and maintenance method according to claim 1, characterized in that: The auxiliary component in step S2 is spiral-shaped.

5. The disassembly and maintenance method according to claim 4, characterized in that: The outer diameter of the top wall of the auxiliary component is D1, the groove top diameter of the screw is D2, and the inner diameter of the cavity bushing is D3, D2<D1<D3.

6. The disassembly and maintenance method according to claim 5, characterized in that: The top wall of the auxiliary component is an arc-shaped surface.

7. The disassembly and maintenance method according to claim 6, characterized in that: The inner diameter of the auxiliary component is consistent with the bottom diameter of the spiral groove of the screw.

8. The disassembly and maintenance method according to claim 1, characterized in that: In step S3, when maintaining the screw, ensure that the auxiliary component is inside the spiral groove; Alternatively, during maintenance, the auxiliary parts are removed and the corresponding positions are recorded or marked. After the maintenance is completed, the auxiliary parts are reinstalled in the spiral groove of the screw according to the records or marks.

9. The disassembly and maintenance method according to claim 8, characterized in that: In step S4, after the screw is assembled, the auxiliary part corresponds to the cavity.

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