Field work screw drop prevention assembly and method

By designing screw transfer and temporary storage fixtures, and utilizing magnetic attraction and structural design to prevent screws from falling off, the problem of screws falling off during on-site operations was solved, improving work efficiency and reducing costs.

CN116967985BActive Publication Date: 2026-05-29HUANENG HUNAN YUEYANG POWER GENERATION CO LTD +1

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HUANENG HUNAN YUEYANG POWER GENERATION CO LTD
Filing Date
2023-07-24
Publication Date
2026-05-29

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Abstract

The application provides a field operation screw drop prevention assembly and method, relates to the technical field of screw disassembly, and comprises a screw transfer tool, a screw temporary storage tool and a connecting part. The connecting part is used for being connected with a hand, and the placing part is used for receiving a screw. The screw temporary storage tool is connected with the screw transfer tool, has a storage area for temporarily storing and classifying screws, and comprises a storage table. The storage area is formed in the storage table and is a blind hole opened in the height direction of the storage table. The screw transferred out of the screw transfer tool can be matched and slid into the blind hole. The application can effectively avoid the risk of screw drop during disassembly, ensure work efficiency, has a simple overall structure, is low in cost, is small and portable, and has ideal actual operation effect.
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Description

Technical Field

[0001] This application relates to the field of screw assembly and disassembly technology, and in particular to a component and method for preventing screws from falling off during on-site operations. Background Technology

[0002] During on-site operations, screws often fall out while being tightened. Once fallen, screws are difficult to find, causing inconvenience during installation or disassembly and consequently affecting work efficiency. Therefore, related technologies typically add magnets to the screwdriver tip to attract screws during removal, reducing the possibility of them falling or slipping. However, this method suffers from a small contact area and weak magnetism, meaning the possibility of screws falling out remains high. Furthermore, adding magnets to the screwdriver tip is slightly more expensive, so many on-site workers still use non-magnetic screwdrivers. Another method involves loosening the screw with a screwdriver or other tools and then manually unscrewing it to reduce the risk of falling. However, this method increases manual labor and reduces productivity, so its practical effectiveness is also not ideal. Summary of the Invention

[0003] The present invention aims to at least partially solve one of the technical problems in the related art.

[0004] Therefore, one embodiment of the present invention proposes an on-site screw-fall prevention component. This on-site screw-fall prevention component can not only effectively avoid the risk of screws falling during disassembly and assembly, and ensure work efficiency, but also has a simple overall structure and low cost. Moreover, due to its small size and portability, the actual operation effect is more ideal.

[0005] Another embodiment of the present invention provides a method for preventing screws from falling off during on-site operations.

[0006] A field operation screw-prevention assembly according to an embodiment of the present invention includes a screw transfer fixture, the screw transfer fixture including a connecting part and a placement part, the connecting part being for connecting to a hand, and the placement part being for receiving screws; and

[0007] A screw temporary storage fixture is connected to the screw transfer fixture, and the screw temporary storage fixture has a storage area for temporarily storing and classifying screws.

[0008] The on-site anti-screw-falling component according to an embodiment of the present invention uses the screw transfer tool of the present invention. When disassembling screws, the screw loading and unloading operator can wear the screw transfer tool with their free fingers and place it under the screw to receive the screw, thereby preventing the screw from falling and effectively avoiding the waste of time and labor costs caused by spending a lot of time searching for screws.

[0009] The addition of a screw storage fixture further improves the on-site screw removal and installation process to prevent screws from falling. It provides temporary storage protection for the screws being removed, thus addressing the risk that in existing technologies, screws are often placed directly on the work platform in the on-site work environment, and since screws are prone to rolling, they are more likely to fall when operators wearing gloves pick them up.

[0010] Meanwhile, the on-site anti-screw falling component of the present invention has a simple overall structure, and the actual operation effect of the entire component is quite ideal.

[0011] In some embodiments, the connecting portion includes a ring sleeve for fitting onto a finger.

[0012] In some embodiments, the ring sleeve is a flexible element made of a flexible material.

[0013] In some embodiments, the placement part includes a placement platform connected to one side of the ring sleeve, and the placement platform has a screw receiving groove extending axially along the ring sleeve, the screw receiving groove passing through the end of the placement platform away from the ring sleeve.

[0014] In some embodiments, the placement portion further includes a baffle movably connected to the end of the placement platform away from the ring sleeve;

[0015] The baffle is provided with a magnetic strip;

[0016] The magnetic attraction force of the magnetic strip is less than the sum of the weight of the baffle and the screw.

[0017] In some embodiments, the baffle and the end face are in contact to form a contact line, and the magnetic strip is arranged on the baffle in a direction parallel to the contact line.

[0018] In some embodiments, the screw temporary storage fixture includes a storage platform, the storage area is formed on the storage platform and is a blind hole opened along the height direction of the storage platform, and the screw transferred out by the screw transfer fixture can be slidably inserted into the blind hole;

[0019] The diameter d of the blind hole is smaller than the diameter D of the nut portion of the screw.

[0020] In some embodiments, the storage platform is a stepped storage platform, and each step of the stepped storage platform is provided with multiple sets of blind holes at intervals along the horizontal direction.

[0021] In some embodiments, the depth h and / or diameter d of the blind holes opened on adjacent steps are inconsistent in order to accommodate screws of different specifications.

[0022] The method for preventing screws from falling off during on-site operations according to an embodiment of the present invention includes the following steps:

[0023] The operator wearing the screw transfer tool wears a screw transfer tool and places the screw transfer tool under the screw to catch it, wherein the screw transfer tool and the screw form a magnetic attraction surface;

[0024] The screw handling operator uses the screw transfer fixture to store the screw in a set position to complete the screw transfer without dropping it;

[0025] When screws need to be installed again, the screw loading and unloading operator wears the screw transfer tool again to take out the stored screws and directly installs them using the screw transfer tool.

[0026] The technical advantages of the on-site screw-prevention method according to the present invention are the same as those of the on-site screw-prevention component in the above embodiments, and will not be repeated here.

[0027] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the screw transfer fixture in this invention (with a magnetic strip attached).

[0029] Figure 2 This is a schematic diagram of a screw temporary storage fixture in this invention.

[0030] Figure 3 yes Figure 2 The diagram of the screw structure is temporarily stored in the file.

[0031] Figure 4 This is a schematic diagram of another structure of the screw storage fixture in this invention (where screws are temporarily stored).

[0032] Figure label:

[0033] 1. Screw transfer fixture; 11. Connecting part; 12. Placement part; 121. Placement platform; 122. Screw receiving slot; 123. Baffle.

[0034] 2. Screw temporary storage fixture; 21. Storage platform; 22. Blind hole;

[0035] 3. Magnetic strip. Detailed Implementation

[0036] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0037] like Figure 1 As shown, the on-site anti-screw-falling assembly of the first aspect of the present invention includes a screw transfer fixture 1 and a screw temporary storage fixture 2.

[0038] The screw transfer fixture 1 includes a connecting part 11 and a placing part 12. The connecting part 11 is used to connect with the hand, and the placing part 12 is used to receive the screw.

[0039] Specifically, the connecting part 11 is connected to the placement part 12. The connecting part 11 can be a structure that is not limited to a glove, finger ring, or wristband worn on the hand. In addition, the connecting part 11 and the placement part 12 can be integrally formed or connected by an intermediate connecting structure (such as a connecting part). For the sake of cost saving and ease of processing, it is preferred that the two be integrally formed.

[0040] Furthermore, during on-site operations, the screw transfer fixture 1 can be used independently without the screw storage fixture 2, effectively preventing screws from falling during on-site disassembly. For example, when a screw is to be disassembled and used immediately, the operator can keep the screw in the screw transfer fixture 1 after disassembly. During installation, the screw transfer fixture 1 can directly assist in installing the screw in the installation position, eliminating the need to place the screw separately. The screw storage fixture 2 can also be used independently for storing and retrieving screws during on-site operations, solving the problem of screws easily rolling off work platforms placed directly in the work environment. In other words, in practical applications, the screw transfer fixture 1 and the screw storage fixture 2 can be used together or separately to avoid the risk of screws falling. Therefore, the technical solution of this invention is not limited to the solution formed by using both in combination.

[0041] like Figure 2 As shown, the screw temporary storage fixture 2 is connected to the screw transfer fixture 1, and the screw temporary storage fixture 2 has a storage area for temporarily storing and classifying screws.

[0042] Specifically, the design of the screw storage fixture 2 provides a centralized platform for storing screws, thus avoiding the problem of screws being placed directly in the field working environment. This not only makes them prone to rolling off the work platform, but also makes it difficult to match and find screws when multiple screws are placed on the work platform at the same time due to their messy placement.

[0043] Therefore, the screw transfer fixture 1 and the screw temporary storage fixture 2 work together to form a system of components to prevent screws from falling off during on-site operations. The two provide protection for on-site screw disassembly and assembly operations, preventing screws from falling off and avoiding the waste of time and labor costs caused by spending a lot of time searching for screws, thereby effectively ensuring the work efficiency of the entire on-site operation.

[0044] Furthermore, the connecting part 11 includes a finger ring for attaching to the finger. The connecting part 11 is preferably a finger ring, which makes it easy to attach the screw transfer tool 1 to the finger of the screw handling operator. The overall structure is compact, which makes it convenient for the screw handling operator to carry the screw transfer tool 1 on site.

[0045] Furthermore, the ring sleeve is a flexible component made of flexible material.

[0046] Specifically, the finger ring is made of a flexible material to ensure that it can be easily and reliably fitted onto the fingers of different screw handling operators. Preferably, both the finger ring and the placement part 12 can be made of elastic plastic material, so that the screw transfer fixture 1 is relatively lightweight. At the same time, due to its elasticity, it can meet the fitting needs of different users and is highly practical.

[0047] In addition, the placement part 12 is elastic, which allows the screw loading and unloading operator to slightly squeeze the placement part 12 with their fingers when transferring screws, so as to further ensure that the screws are reliably placed in the placement part 12 and achieve screw transfer without falling out.

[0048] like Figure 1 As shown, the placement part 12 further includes a placement platform 121, which is connected to one side of the ring sleeve. A screw receiving groove 122 extending along the axial direction of the ring sleeve is provided on the placement platform 121, and the screw receiving groove 122 passes through the end of the placement platform 121 away from the ring sleeve.

[0049] Specifically, the placement platform 121 may adopt a structure not limited to a semi-cylindrical shape, and the placement platform 121 may be integrally formed on one side of the ring sleeve. When the screw loading and unloading operator puts on the ring sleeve, the flat surface of the semi-cylindrical placement platform 121 faces upward.

[0050] In addition, the screw receiving groove 122 extends along the axial direction of the placement platform 121 and passes through the end of the placement platform 121 away from the ring sleeve. The screw receiving groove 122 is designed in this way so that the screw can slide into or out of the end opening, which facilitates the screw's entry and exit from the placement platform 121. For example, on the placement platform 121 with a semi-cylindrical structure, the screw receiving groove 122 is opened along the axial direction of the plane of the placement platform 121. At the same time, in order to ensure the reliability of the screw placement in the screw receiving groove 122, it is preferable to open the screw receiving groove 122 as an arc-shaped groove, thereby increasing the contact area between the screw and the screw receiving groove 122.

[0051] Furthermore, the placement part 12 also includes a baffle 123, which is movably connected to the end of the placement platform 121 away from the ring sleeve.

[0052] To prevent accidental slippage of screws during the placement of screws in the screw storage fixture 2 or the installation position, a baffle 123 is added. During the screw placement process, the screw loading and unloading operator can lightly press the baffle 123 with their fingers to hold the screw in place, so that the screw can be placed vertically or at a certain angle towards the screw storage fixture 2 or the installation position.

[0053] Specifically, the baffle 123 can be hinged to the end of the placement platform 121, and its structure cooperates with the screw receiving groove 122 to open and close the screw receiving groove 122, so as to realize the screw sliding in and out or the pressing action against it.

[0054] Furthermore, a magnetic strip 3 is provided on the baffle 123.

[0055] Furthermore, the magnetic attraction force of the magnetic strip 3 is less than the sum of the weight of the baffle 123 and the screw.

[0056] The magnetic strip 3 on the baffle 123 creates a magnetic attraction force on the screw in the screw receiving slot 122, ensuring the reliability of the screw's placement in the screw receiving slot 122. In addition, the magnetic attraction force of the magnetic strip 3 is less than the sum of the weight of the baffle 123 and the screw, so that the baffle 123 can be opened smoothly when the screw is placed in the screw temporary storage fixture 2 or the position to be installed.

[0057] Furthermore, the baffle 123 and the end face are in contact to form a contact line, and the magnetic strip 3 is arranged on the baffle 123 in a direction parallel to the contact line.

[0058] The contact line formed between the baffle 123 and the end can be understood as an arc-shaped line formed between the end of the placement platform 121 (the end away from the ring sleeve) and the baffle 123 after the screw receiving groove 122 is opened, taking the placement platform 121 as a semi-cylindrical structure as an example. The shape of the arc-shaped line is close to the shape of the cross-section of the screw receiving groove 122. Therefore, it is preferable to arrange the magnetic strip 3 along the direction parallel to the arc-shaped line. Compared with the prior art of adding magnetic attraction screws to the screwdriver head, the magnetic attraction part and the screw are almost in point contact, the contact area is small and the magnetism is not strong. The magnetic strip 3 arranged in this invention can form an arc-shaped magnetic attraction surface for the screw in the screw receiving groove 122, thereby ensuring good magnetic attraction.

[0059] In addition, the specific magnetic strip 3 may not be limited to being adhered to or fixed to the baffle 123 by means of bolts or other methods.

[0060] like Figures 2 to 4 As shown, the screw temporary storage fixture 2 further includes a storage platform 21, a storage area formed on the storage platform 21 and a blind hole 22 opened along the height direction of the storage platform 21, and the screw transferred out by the screw transfer fixture 1 can be slidably inserted into the blind hole 22.

[0061] Among them, the diameter d of the blind hole 22 is smaller than the diameter D of the nut part of the screw.

[0062] Specifically, the blind hole 22 can be a cylindrical blind hole 22, and the diameter d of the blind hole 22 is smaller than the diameter D of the nut part of the bolt, so that the screw can be placed on the storage platform 21, which facilitates the removal operation when the screw is reinstalled later.

[0063] Furthermore, the storage platform 21 is a stepped storage platform, and multiple sets of blind holes 22 are arranged at intervals along the horizontal direction on each step of the stepped storage platform.

[0064] Specifically, multiple sets of blind holes 22 can be arranged along the length or width of the horizontal plane of each step, and the multiple sets of blind holes 22 are preferably opened at equal intervals.

[0065] In some embodiments, the depth h and / or diameter d of the blind holes 22 opened on adjacent steps are inconsistent in order to facilitate the storage of screws of different specifications.

[0066] Specifically, the blind hole 22 can be set up in the following two situations: when the hole depth h and / or hole diameter d of multiple sets of blind holes 22 set up on the same step are the same, the blind hole 22 on the higher step is larger or smaller than the blind hole 22 on the adjacent lower step; when the hole depth h and / or hole diameter d of multiple sets of blind holes 22 set up on the same step are different (they can decrease or increase sequentially), the blind hole 22 on the higher step is larger or smaller than the blind hole 22 on the adjacent lower step.

[0067] The stepped storage platform and its blind hole 22 structure are designed to allow the screw loading and unloading operator to select the blind hole 22 on different steps to place the screw according to its length, making it easier to classify and retrieve the screw and making it highly operable.

[0068] According to an embodiment of the present invention, the on-site operation anti-screw falling component uses the screw transfer tool 1 of the present invention. When disassembling a screw, the screw loading and unloading operator can wear the screw transfer tool 1 with their free fingers and place it under the screw to receive the screw, thereby preventing the screw from falling. At the same time, with the assistance of the magnetic strip 3 on the screw transfer tool 1, the screw can also be reliably magnetically attracted into the screw receiving groove 122, thus effectively avoiding the risk of screws falling during disassembly.

[0069] The addition of the screw storage fixture 2 further improves the on-site screw disassembly and assembly process to prevent screws from falling. It provides temporary storage protection for the disassembled screws, solving the problem that in the existing technology, the disassembled screws are often placed directly on the work platform in the on-site work environment, and the screws are easy to roll, so they are more likely to fall when the screw loading and unloading operator is wearing gloves to pick them up.

[0070] Meanwhile, the on-site anti-screw falling component of the present invention has a simple overall structure and can be made of plastic, making it lightweight, compact and portable. It can also be manufactured using 3D printing technology, so the cost is low, and the actual operation effect of the entire component is quite ideal.

[0071] like Figures 1 to 4 As shown, the on-site screw-prevention method according to another aspect of the present invention, based on the above-mentioned on-site screw-prevention component, includes the following steps:

[0072] S1. The operator wearing screw transfer tool 1 wears screw transfer tool 1 and places screw transfer tool 1 under the screw to catch the screw, wherein screw transfer tool 1 and screw form a magnetic attraction surface;

[0073] S2. The screw loading and unloading operator uses screw transfer fixture 1 to store the screw in the set position to complete the screw transfer without falling off.

[0074] S3. When it is necessary to install screws again, the screw loading and unloading operator wears the screw transfer tool 1 again to take out the stored screws and directly installs the screws with the help of the screw transfer tool 1.

[0075] The technical advantages of the on-site screw-prevention method according to the present invention are the same as those of the on-site screw-prevention component in the above embodiments, and will not be repeated here.

[0076] The following describes the usage process of the anti-screw-fall-off component in conjunction with its structure during on-site operations. Specifically, the screw loading and unloading operator puts the ring on their free finger and ensures that the flat surface of the semi-cylindrical placement platform 121 is facing upwards. During the screw loading and unloading operator's process of unscrewing the screw with a screwdriver or other tools, the finger wearing the screw transfer fixture 1 is positioned at the screw being removed, while ensuring that the screw receiving groove 122 is positioned below the screw being removed. After the screw is removed, it pushes open the baffle 123 and slides from the end of the placement platform 121 into the screw receiving groove 122. Afterwards, the baffle 123 automatically closes, and the magnetic strip 3 forms a magnetic attraction force on the screw, completing the screw receiving operation.

[0077] Secondly, the screw loading and unloading operator can use their fingers to gently squeeze the placement part 12 to further confine the screw within it, and slowly move the screw transfer fixture 1, which holds the screw, to the screw temporary storage fixture 2. Locate the blind hole 22 on the storage platform 21 that corresponds to the screw specification, so that the placement platform 121 is vertical or at a certain angle to the blind hole 22. At this time, under the action of the weight of the screw and the baffle 123, the baffle 123 is opened, and the screw slides from the screw receiving groove 122 into the blind hole 22 for placement, thereby achieving the transfer and temporary storage of the screw without it falling out.

[0078] Subsequently, when the aforementioned screws need to be installed again, the screw loading and unloading operator can wear the screw transfer fixture 1 again, take the screw from the screw storage fixture 2 and transfer it into the screw receiving slot 122 until it is in the installation position. Then, flatten the baffle 123, align the screw with the installation hole in the installation position, and slowly push the screw. After manually rotating the screw a few times, the screw is removed from the screw transfer fixture 1. At this time, the screw can be tightened with a screwdriver to complete the screw reinstallation operation.

[0079] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0080] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0081] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0082] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0083] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0084] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. A component for preventing screws from falling off during on-site operations, characterized in that, include: A screw transfer fixture, comprising a connecting part and a placing part, wherein the connecting part is used to connect with a hand and the placing part is used to receive screws; and A screw temporary storage fixture is connected to the screw transfer fixture, and the screw temporary storage fixture has a storage area for temporarily storing and classifying screws; in, The connecting part includes a ring sleeve for fitting onto a finger; The placement part includes a placement platform connected to one side of the ring sleeve. A screw receiving groove extending along the axial direction of the ring sleeve is provided on the placement platform, and the screw receiving groove passes through the end of the placement platform away from the ring sleeve. The placement part also includes a baffle movably connected to the end of the placement platform away from the ring sleeve. The baffle is provided with a magnetic strip; The magnetic attraction force of the magnetic strip is less than the sum of the weight of the baffle and the screw.

2. The on-site screw-prevention component according to claim 1, characterized in that, The ring sleeve is a flexible component made of flexible material.

3. The on-site screw-prevention component according to claim 1, characterized in that, The baffle and the end face are in contact to form a contact line, and the magnetic strip is arranged on the baffle in a direction parallel to the contact line.

4. The on-site screw-prevention component according to any one of claims 1 to 3, characterized in that, The screw temporary storage fixture includes a storage platform, the storage area is formed on the storage platform and has a blind hole opened along the height direction of the storage platform, and the screw transferred out by the screw transfer fixture can be slidably inserted into the blind hole. The diameter d of the blind hole is smaller than the diameter D of the nut portion of the screw.

5. The on-site screw-prevention component according to claim 4, characterized in that, The storage platform is a stepped storage platform, and multiple sets of blind holes are arranged at horizontal intervals on each step of the stepped storage platform.

6. The on-site screw-prevention component according to claim 5, characterized in that, The blind holes on adjacent steps have different hole depths (h) and / or diameters (d) to facilitate the storage of screws of different specifications.

7. A method for preventing screws from falling off during on-site operations, characterized in that, Including the on-site screw-prevention component as described in any one of claims 1-6, the on-site screw-prevention method includes the following steps: The operator wearing the screw transfer tool wears a screw transfer tool and places the screw transfer tool under the screw to catch it, wherein the screw transfer tool and the screw form a magnetic attraction surface; The screw handling operator uses the screw transfer fixture to store the screw in a set position to complete the screw transfer without dropping it; When screws need to be installed again, the screw loading and unloading operator wears the screw transfer tool again to take out the stored screws and directly installs them using the screw transfer tool.