Special screw locking mechanism

Abstract

The application relates to a special-shaped screw locking mechanism, which comprises a suction nozzle for sucking special-shaped screws, a driving device, the driving device comprising an electric driver and an electric driver head connected with the electric driver, the electric driver head being connected with the suction nozzle away from one end of the electric driver to drive the suction nozzle to rotate and pre-assemble the special-shaped screws, at least two torsion wheels, the two torsion wheels being respectively and slidably arranged on the two sides of the suction nozzle so that the two torsion wheels can abut against the circumferential side of the special-shaped screws, and a transmission device connected with the power output end of the electric driver and used for driving the torsion wheels to rotate to tighten the special-shaped screws. The special-shaped screw locking mechanism can quickly tighten the special-shaped screws to reach a preset torsion value in limited space, guarantees the torsion consistency, improves the assembling efficiency, does not damage the product in the tightening process, and guarantees the finished product quality of the product.

Description

Technical Field

[0001] This application relates to the field of locking device technology, and in particular to a locking mechanism for irregular screws. Background Technology

[0002] In watch design, the crown is a signature feature, and to protect it from accidental damage during use, protective structures are often added to both sides of the crown. However, this design lacks sufficient space to secure the crown, preventing the rapid tightening like a wrench. Assembly requires manual tightening, resulting in low efficiency and inconsistent torque. After manual assembly, an external torque-controlled tool is needed to individually tighten the crown at specific angles to control the torque, which can easily damage the watch during this process. Summary of the Invention

[0003] This application provides a non-standard screw fastening mechanism to solve the technical problems of low assembly efficiency and poor product torque consistency caused by manual assembly.

[0004] This application provides a non-standard screw fastening mechanism, comprising: a suction nozzle for adsorbing non-standard screws; a driving device including an electric screwdriver and an electric screwdriver bit connected thereto, the end of the electric screwdriver bit away from the electric screwdriver being connected to the suction nozzle to drive the suction nozzle to rotate for pre-assembly of the non-standard screws; at least two torque wheels, the two torque wheels being slidably disposed on both sides of the suction nozzle so that the two torque wheels can press against the periphery of the non-standard screws; and a transmission device connected to the power output end of the electric screwdriver bit for driving the torque wheels to rotate to tighten the non-standard screws.

[0005] In one possible implementation, the transmission device includes a driving gear and a driven gear that mesh with each other. The driving gear is disposed on the electric screwdriver bit, and there are at least two driven gears. The driven gears and the torque wheel correspond one-to-one and are coaxially arranged through a wheel axle. The axial direction of the wheel axle is parallel to the axial direction of the electric screwdriver bit.

[0006] In one possible implementation, a base is also included, on which a buffer platform is provided, and an adjustment device for adjusting the distance between the two torque wheels is provided at the end of the buffer platform near the suction nozzle.

[0007] In one possible implementation, the adjustment device includes a pneumatic gripper, a connecting plate connected to the output end of the pneumatic gripper, a first guide rail, and a first slider slidably connected to the first guide rail. The first guide rail is disposed on a buffer platform. The side of the connecting plate facing the pneumatic gripper is fixedly connected to the first slider. A support column is disposed on the side of the connecting plate away from the pneumatic gripper, and a wheel axle is rotatably disposed on the support column.

[0008] In one possible implementation, a screw is provided through one of the supports perpendicular to the axle axially, and the end of the screw away from the support is provided as a threaded segment. The threaded segment of the screw is threadedly connected to another support, and a limit nut is provided on the threaded segment of the screw, with the limit nut located between the two supports.

[0009] In one possible implementation, the electric screwdriver head is provided with an opening, the electric screwdriver head and the suction nozzle are coaxially arranged and each is provided with a first negative pressure channel communicating with the opening; a support plate is provided on the buffer platform, and a negative pressure connector is provided on the side of the support plate facing the electric screwdriver head, the negative pressure connector is sleeved on the periphery of the electric screwdriver head and the negative pressure connector is provided with a negative pressure inlet communicating with the opening.

[0010] In one possible implementation, a bushing is fitted around the periphery of the electric screwdriver bit, the bushing being located between the negative pressure connector and the electric screwdriver bit, a bearing being installed inside the bushing, and the electric screwdriver bit being rotatably connected to the bushing via the bearing; a second negative pressure channel is provided on the bushing, with the two ends of the second negative pressure channel respectively connected to the first negative pressure channel and an opening.

[0011] In one possible implementation, the electric screwdriver is placed on a buffer platform. A second guide rail is provided along the axial direction of the screwdriver head on the side of the base facing the electric screwdriver. A second slider is provided on the side of the buffer platform away from the electric screwdriver and is slidably connected to the second guide rail. A first upright plate is provided at one end of the base and is connected to the buffer platform by fasteners. An elastic buffer device is provided between the other end of the base and the buffer platform.

[0012] In one possible implementation, the elastic buffer device includes a second vertical plate disposed on a base, a third vertical plate disposed on a buffer platform, a guide rod, and an elastic element sleeved on the guide rod. The second and third vertical plates are disposed opposite to each other. One end of the guide rod passes through the second vertical plate, and the other end passes through the third vertical plate. One end of the elastic element abuts against the second vertical plate, and the other end abuts against the third vertical plate.

[0013] In one possible implementation, a flexible pad is provided on the side of the suction nozzle facing the irregular screw.

[0014] In one possible implementation, the suction nozzle has a first groove along its axial direction on the side facing the flexible pad, and a second groove communicating with the first groove is provided on the circumferential side of the suction nozzle along its radial direction.

[0015] In one possible implementation, an elastic layer is provided on the outer periphery of the torsion wheel.

[0016] In one possible implementation, the elastic layer is provided with anti-slip texture.

[0017] The technical solutions provided in this application have the following advantages compared with the prior art:

[0018] The non-standard screw fastening mechanism provided in this application embodiment first uses internal negative pressure to attract non-standard screws (such as watch crowns), aligning and placing them into the threaded holes at the assembly position. The electric screwdriver drives the screwdriver bit to rotate, causing the suction nozzle to rotate a preset number of revolutions for pre-assembly. Next, two torque wheels move relative to each other and approach the suction nozzle until they press against the periphery of the watch crown. At this point, the negative pressure of the suction nozzle closes, the torque value is set in the electric screwdriver controller, and the torque wheels rotate under the transmission action of the transmission device. The friction between the torque wheels and the non-standard screws is used to quickly tighten them to the preset torque value, ensuring torque consistency and improving assembly efficiency. Because the torque wheels do not contact the protective structures on both sides of the watch crown, the predetermined torque can be achieved within a limited contact area, preventing damage to the product during tightening and thus ensuring the quality of the finished product. Attached Figure Description

[0019] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0022] Figure 1 A perspective view of a non-standard screw fastening mechanism provided in an embodiment of this application;

[0023] Figure 2 for Figure 1 The diagram shown illustrates the usage status of the non-standard screw fastening mechanism.

[0024] Figure 3 for Figure 1 A top view of the irregular screw fastening mechanism shown;

[0025] Figure 4 For along Figure 3 A cross-sectional view along the AA direction;

[0026] Figure 5 for Figure 1 A partial three-dimensional view of the non-standard screw fastening mechanism is shown;

[0027] Figure 6 for Figure 1 A side view of the irregular screw fastening mechanism is shown;

[0028] Figure 7 for Figure 1 The front view of the irregular screw fastening mechanism is shown;

[0029] Figure 8 This is a schematic diagram of the crown assembly in the prior art. Figure 1 The arrow indicates the tightening direction;

[0030] Figure 9 This is a schematic diagram of the crown assembly in the prior art. Figure 2 The arrow indicates the tightening direction.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1. Irregular screw fastening mechanism; 11. Base; 111. Second guide rail; 112. Second slider; 113. First upright plate; 114. Fastener; 12. Suction nozzle; 121. First negative pressure channel; 122. Flexible pad; 123. First groove; 124. Second groove; 13. Electric screwdriver; 14. Electric screwdriver bit; 141. Bushing; 15. Torque wheel; 151. Elastic layer; 152. Anti-slip texture; 16. Transmission device; 161. Driving gear; 162. Driven gear 163. Wheel; 17. Wheel axle; 18. Buffer platform; 19. Support plate; 10. Negative pressure connector; 11. Negative pressure inlet; 12. Adjustment device; 13. Pneumatic gripper; 14. Connecting plate; 15. First guide rail; 16. First slider; 17. Support column; 18. Screw; 19. Threaded section; 10. Limiting nut; 11. Elastic buffer device; 19. Second vertical plate; 19. Third vertical plate; 19. Guide rod; 19. Elastic element;

[0033] 2. Crown; 3. Protective structure; 4. External torque setting tool. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0035] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0036] For ease of description, spatial relative terms may be used in the text to describe the relative position or movement of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "front," "back," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure undergoes a positional flip, orientation change, or change of motion, these directional indications will change accordingly. For instance, an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0037] In existing technologies, such as Figure 8 As shown, in watch design, the crown 2 is a signature feature. To protect it from accidental damage during use, protective structures 3 are often added to both sides of the crown 2. However, this design lacks sufficient space to secure the crown 2, preventing the rapid tightening like a wrench. During assembly, manual tightening is necessary, leading to low assembly efficiency and inconsistent torque across the product. Figure 9 As shown, after manual assembly, it is necessary to use an external torque-fixing tool 4 to tighten it individually at a specific angle to control the locking torque. During the tightening process, the product is easily damaged.

[0038] To address the technical problems of low assembly efficiency and poor torque consistency caused by manual assembly methods in existing technologies, this application provides a non-standard screw fastening mechanism. This mechanism can quickly tighten screws to a preset torque value within a limited space, ensuring torque consistency and improving assembly efficiency. Simultaneously, it does not damage the product during the tightening process, thus guaranteeing the quality of the finished product.

[0039] Figure 1A non-standard screw fastening mechanism 1 provided in this application includes a suction nozzle 12, a driving device, a torque wheel 15, and a transmission device 16 for adsorbing non-standard screws. The driving device includes an electric screwdriver 13 and an electric screwdriver bit 14 connected thereto. The end of the electric screwdriver bit 14 away from the electric screwdriver 13 is connected to the suction nozzle 12 to drive the suction nozzle 12 to rotate for pre-assembly of the non-standard screws. At least two torque wheels 15 are provided, and the two torque wheels 15 are slidably disposed on both sides of the suction nozzle 12 so that the two torque wheels 15 can press against the periphery of the non-standard screws. The transmission device 16 is connected to the output end of the electric screwdriver bit 14 for driving the torque wheel 15 to rotate to tighten the non-standard screws.

[0040] It is understandable that, such as Figure 2 As shown, in use, the suction nozzle 12 first uses internal negative pressure to attract irregularly shaped screws (such as the crown), aligning the screws and placing them in the threaded holes of the assembly position. The electric screwdriver 13 drives the electric screwdriver head 14 to rotate, and the electric screwdriver head 14 drives the suction nozzle 12 to rotate a preset number of turns for pre-assembly. Then, the two torque wheels 15 move relative to each other and approach the suction nozzle 12 until they are pressed against the periphery of the crown. At this time, the negative pressure of the suction nozzle 12 is turned off. The torque value is set in the controller of the electric screwdriver 13. Under the transmission action of the transmission device 16, the torque wheels 15 rotate. The friction between the torque wheels 15 and the irregularly shaped screws simulates the rubbing action of human fingers to quickly tighten the irregularly shaped screws, achieving the preset torque value, ensuring torque consistency, and improving assembly efficiency. Since the torque wheels 15 do not contact the protective structures on both sides of the crown, the predetermined torque can be achieved in a limited contact area, and the product will not be damaged during the tightening process, thus ensuring the quality of the finished product.

[0041] Optionally, the suction nozzle 12 is cylindrical, and the outer diameter of the suction nozzle 12 is smaller than the outer diameter of the special-shaped screw, so as to leave enough operating space for the torque wheel 15.

[0042] In some embodiments, such as Figure 3 As shown, the transmission device 16 includes a driving gear 161 and a driven gear 162 that mesh with each other. The driving gear 161 is sleeved on the periphery of the electric screwdriver bit 14. There are at least two driven gears 162. The driven gears 162 and the torque wheel 15 correspond one-to-one and are coaxially arranged through a wheel axle 163. The axial direction of the wheel axle 163 is parallel to the axial direction of the electric screwdriver bit 14. In this embodiment, the axial direction of the wheel axle 163 and the axial direction of the electric screwdriver bit 14 are parallel. In this embodiment, the torque is transmitted through the meshing action of the driving gear 161 and the driven gear 162, causing the torque wheel 15 to rotate, thereby tightening the irregular screws. The transmission device 16 is simple and easy to maintain.

[0043] Optionally, one end of the electric screwdriver bit 14 is connected to the electric screwdriver 13, and the other end is connected to the suction nozzle 12. The electric screwdriver bit 14 and the suction nozzle 12 can be detachably connected by a threaded connection. Furthermore, a retaining ring is provided on the shoulder of the electric screwdriver bit 14 to prevent the drive gear 161 from moving axially on the electric screwdriver bit 14.

[0044] In some embodiments, such as Figure 1 As shown, the non-standard screw fastening mechanism 1 also includes a base 11, on which a buffer platform 17 is provided. An adjustment device 18 for adjusting the distance between the two torque wheels 15 is provided at one end of the buffer platform 17 near the suction nozzle 12. By increasing the distance between the two torque wheels 15 through the adjustment device 18, the two torque wheels 15 are in an open state, meaning the torque wheels 15 do not contact the non-standard screw. At this time, the driven gear 162 and the driving gear 161 remain engaged but not completely disengaged, and the suction nozzle 12 is rotated only by the electric screwdriver bit 14 to complete the pre-assembly. Then, by decreasing the distance between the two torque wheels 15 through the adjustment device 18, the two torque wheels 15 are in a working state, meaning the torque wheels 15 press against the periphery of the non-standard screw. At this time, the driven gear 162 and the driving gear 161 remain fully engaged, and the non-standard screw is quickly tightened through the friction between the torque wheels 15 and the non-standard screw.

[0045] In some embodiments, such as Figure 5 and Figure 6 As shown, the adjusting device 18 includes a pneumatic gripper 181, a connecting plate 182 connected to the output end of the pneumatic gripper 181, a first guide rail 183, and a first slider 184 slidably connected to the first guide rail 183. The first guide rail 183 is disposed on the buffer platform 17. The side of the connecting plate 182 facing the pneumatic gripper 181 is fixedly connected to the first slider 184. A support column 185 is disposed on the side of the connecting plate 182 away from the pneumatic gripper 181, and a wheel axle 163 is rotatably disposed on the support column 185. It should be noted that in this embodiment, the pneumatic gripper 181 is a parallel gripper in the prior art, that is, the two pneumatic fingers of the pneumatic gripper 181 always move relatively parallel. By driving the connecting plate 182 to move relatively parallel through the pneumatic fingers of the pneumatic gripper 181, the wheel axle 163 moves relatively parallel, thereby adjusting the distance between the two torque wheels 15.

[0046] In some embodiments, such as Figure 6 As shown, a screw 186 is axially inserted through one of the support pillars 185 perpendicular to the axle 163. The end of the screw 186 furthest from the support pillar 185 is a threaded section 1861. The threaded section 1861 is threadedly connected to the other support pillar 185. A limit nut 187 is provided on the threaded section 1861 of the screw 186. The limit nut 187 is located between the two support pillars 185, thereby limiting the travel of the torque wheel 15. Figure 5The two torque wheels 15 shown are in the open state. At this time, the driven gear 162 and the driving gear 161 are always engaged but not completely disengaged. The adjusting device 18 can drive the torque wheels 15 to move closer to each other.

[0047] In some embodiments, such as Figure 1 and Figure 4 As shown, the electric screwdriver bit 14 has an opening, and the electric screwdriver bit 14 and the suction nozzle 12 are coaxially arranged and each has a first negative pressure channel 121 communicating with the opening. A support plate 171 is provided on the buffer platform 17, and a negative pressure connector 172 is provided on the side of the support plate 171 facing the electric screwdriver bit 14. The negative pressure connector 172 is sleeved on the periphery of the electric screwdriver bit 14 and has a negative pressure inlet 1721 communicating with the opening. An external negative pressure device can be connected through the negative pressure inlet 1721, so that the first negative pressure channel 121 of the suction nozzle 12 forms negative pressure to attract irregular screws. At the same time, the support plate 171 provides support and improves the stability of the rotation of the electric screwdriver bit 14.

[0048] Optionally, multiple openings can be provided, and the multiple openings are distributed in a ring around the circumference of the electric screwdriver bit 14 so that the user can align the openings and connect the negative pressure inlet 1721 during installation.

[0049] In some embodiments, such as Figure 4 As shown, a bushing 141 is fitted around the periphery of the electric screwdriver bit 14. The bushing 141 is located between the negative pressure connector 172 and the electric screwdriver bit 14. A bearing is installed inside the bushing 141, and the electric screwdriver bit 14 is rotatably connected to the bushing 141 through the bearing. A second negative pressure channel is provided on the bushing 141, and the two ends of the second negative pressure channel are respectively connected to the first negative pressure channel 121 and the opening. By setting the bushing 141, the axial position of the electric screwdriver bit 14 can be fixed, reducing the phenomenon of displacement due to vibration, improving the rotational stability of the electric screwdriver bit 14, and also reducing the friction loss and surface wear of the electric screwdriver bit 14.

[0050] In some embodiments, such as Figure 7 As shown, the electric screwdriver 13 is mounted on a buffer platform 17. A second guide rail 111 is provided along the axial direction of the screwdriver head 14 on the side of the base 11 facing the screwdriver 13. A second slider 112, slidably connected to the second guide rail 111, is provided on the side of the buffer platform 17 away from the screwdriver 13. A first upright plate 113 is provided at one end of the base 11, and the first upright plate 113 is connected to the buffer platform 17 via a fastener 114. An elastic buffer device 19 is provided between the other end of the base 11 and the buffer platform 17. Optionally, the fastener 114 can be a bolt, and the first upright plate 113 is threadedly connected to the buffer platform 17 via a bolt. Since the electric screwdriver 13 vibrates during operation, affecting the assembly accuracy of irregular screws, the elastic buffer device 19 reduces the vibration of the electric screwdriver 13, thereby ensuring the assembly accuracy of irregular screws.

[0051] Optionally, such as Figure 7 As shown, the elastic buffer device 19 includes a second vertical plate 191 disposed on the base 11, a third vertical plate 192 disposed on the buffer platform 17, a guide rod 193, and an elastic element 194 sleeved on the guide rod 193. The second vertical plate 191 and the third vertical plate 192 are arranged opposite to each other. One end of the guide rod 193 passes through the second vertical plate 191, and the other end passes through the third vertical plate 192. One end of the elastic element 194 abuts against the second vertical plate 191, and the other end abuts against the third vertical plate 192. The elastic element 194 can be a spring. The vibration of the electric screwdriver 13 is transmitted to the buffer platform 17. The elastic deformation of the elastic element 194 can absorb the vibration energy of the buffer platform 17, thereby reducing the overall vibration of the non-standard screw fastening mechanism 1 and ensuring the assembly accuracy of the non-standard screw.

[0052] In some embodiments, such as Figure 7 As shown, a flexible pad 122 is provided on the side of the suction nozzle 12 facing the irregular screw. The flexible pad 122 can be made of flexible material to avoid wear on the irregular screw during assembly.

[0053] The flexible pad 122 and the suction nozzle 12 can be fixedly connected by means of bonding, welding, etc. In an optional embodiment, such as... Figure 4 and Figure 5 As shown, adhesive is applied between the flexible pad 122 and the suction nozzle 12. A first groove 123 is provided axially on the side of the suction nozzle 12 facing the flexible pad 122. A second groove 124 communicating with the first groove 123 is provided radially on the periphery of the suction nozzle 12. Excess adhesive enters the first groove 123. After the adhesive cures, it improves the connection stability between the flexible pad 122 and the suction nozzle 12. The shapes of the first groove 123 and the second groove 124 can be circular, square, etc., and are not specifically limited here. In this embodiment, multiple first grooves 123 are provided, and the multiple first grooves 123 are distributed in a circular array centered on the axis of the suction nozzle 12.

[0054] In some embodiments, such as Figure 5As shown, an elastic layer 151 is provided on the outer periphery of the torque wheel 15. The elastic layer 151 can be made of a material with a certain degree of elasticity, such as TPE (Thermoplastic rubber), TPV (Thermoplastic Vulcanizate), TPO (Thermoplastic polyolefin), TPU (Thermoplastic polyurethanes), etc. The elastic layer 151 can improve the friction between the torque wheel 15 and the irregular screw, and also prevent wear on the irregular screw during the assembly process.

[0055] Optionally, the elastic layer 151 is provided with anti-slip texture 152 to increase the friction between the torque wheel 15 and the irregular screw.

[0056] It should be noted that the special-shaped screw fastening mechanism 1 provided in this application embodiment is not limited to the field of crown locking operation with limited space, but can also be applied to other special screw locking operation fields with limited space, which will not be described in detail here.

[0057] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0058] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0059] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A locking mechanism for irregularly shaped screws, characterized in that, include: A suction nozzle (12) is used to pick up irregularly shaped screws; The driving device includes an electric screwdriver (13) and an electric screwdriver bit (14) connected thereto. One end of the electric screwdriver bit (14) away from the electric screwdriver (13) is connected to the suction nozzle (12) to drive the suction nozzle (12) to rotate for pre-assembly of irregular screws. At least two torque wheels (15) are provided, and the two torque wheels (15) are slidably disposed on both sides of the suction nozzle (12) so that the two torque wheels (15) can abut against the periphery of the irregular screw; and The transmission device (16) is connected to the power output end of the electric screwdriver bit (14) and is used to drive the torque wheel (15) to rotate to tighten the irregular screw.

2. The non-standard screw fastening mechanism according to claim 1, characterized in that, The transmission device (16) includes a driving gear (161) and a driven gear (162) that mesh with each other. The driving gear (161) is disposed on the electric screwdriver bit (14). There are at least two driven gears (162). The driven gears (162) and the torque wheel (15) correspond one-to-one and are coaxially disposed between them through a wheel axle (163). The axial direction of the wheel axle (163) is parallel to the axial direction of the electric screwdriver bit (14).

3. The non-standard screw fastening mechanism according to claim 2, characterized in that, It also includes a base (11), on which a buffer platform (17) is provided. At one end of the buffer platform (17) near the suction nozzle (12), an adjustment device (18) for adjusting the distance between the two torque wheels (15) is provided.

4. The non-standard screw fastening mechanism according to claim 3, characterized in that, The adjusting device (18) includes a pneumatic gripper (181), a connecting plate (182) connected to the output end of the pneumatic gripper (181), a first guide rail (183), and a first slider (184) slidably connected to the first guide rail. The first guide rail (183) is disposed on the buffer platform (17). The side of the connecting plate (182) facing the pneumatic gripper (181) is fixedly connected to the first slider (184). A support column (185) is disposed on the side of the connecting plate (182) away from the pneumatic gripper (181). The axle (163) is rotatably disposed on the support column (185).

5. The non-standard screw fastening mechanism according to claim 4, characterized in that, One of the support pillars (185) is provided with a screw (186) through it perpendicular to the axial direction of the axle (163). The end of the screw (186) away from the support pillar (185) is provided with a threaded section (1861). The threaded section (1861) of the screw (186) is threadedly connected to the other support pillar (185). A limit nut (187) is provided on the threaded section (1861) of the screw (186), and the limit nut (187) is located between the two support pillars (185).

6. The non-standard screw fastening mechanism according to claim 3, characterized in that, The electric screwdriver bit (14) is provided with an opening, and the electric screwdriver bit (14) and the suction nozzle (12) are coaxially arranged and both are provided with a first negative pressure channel (121) communicating with the opening; A support plate (171) is provided on the buffer platform (17). A negative pressure connector (172) is provided on the side of the support plate (171) facing the electric screwdriver bit (14). The negative pressure connector (172) is sleeved on the periphery of the electric screwdriver bit (14) and a negative pressure inlet (1721) communicating with the opening is provided on the negative pressure connector (172).

7. The non-standard screw fastening mechanism according to claim 6, characterized in that, The electric screwdriver bit (14) is fitted with a bushing (141) on its periphery. The bushing (141) is located between the negative pressure connector (172) and the electric screwdriver bit (14). A bearing is provided inside the bushing (141). The electric screwdriver bit (14) is rotatably connected to the bushing (141) through the bearing. The bushing (141) is provided with a second negative pressure channel, and the two ends of the second negative pressure channel are respectively connected to the first negative pressure channel (121) and the opening.

8. The non-standard screw fastening mechanism according to claim 3, characterized in that, The electric screwdriver (13) is mounted on the buffer platform (17). A second guide rail (111) is provided on the side of the base (11) facing the electric screwdriver (13) along the axial direction of the electric screwdriver head (14). A second slider (112) is provided on the side of the buffer platform (17) away from the electric screwdriver (13) and is slidably connected to the second guide rail (111). One end of the base (11) is provided with a first upright plate (113), which is connected to the buffer platform (17) by fasteners (114). An elastic buffer device (19) is provided between the other end of the base (11) and the buffer platform (17).

9. The non-standard screw fastening mechanism according to claim 8, characterized in that, The elastic buffer device (19) includes a second upright plate (191) disposed on the base (11), a third upright plate (192) disposed on the buffer platform (17), a guide rod (193), and an elastic element (194) sleeved on the guide rod (193). The second upright plate (191) and the third upright plate (192) are disposed opposite to each other. One end of the guide rod (193) passes through the second upright plate (191), and the other end passes through the third upright plate (192). One end of the elastic element (194) abuts against the second upright plate (191), and the other end abuts against the third upright plate (192).

10. The non-standard screw fastening mechanism according to any one of claims 1 to 9, characterized in that, The suction nozzle (12) has a flexible pad (122) on the side facing the irregular screw.

11. The non-standard screw fastening mechanism according to claim 10, characterized in that, The suction nozzle (12) has a first groove (123) along its axial direction on the side facing the flexible pad (122), and a second groove (124) communicating with the first groove (123) is provided on the circumferential side of the suction nozzle (12) along its radial direction.

12. The non-standard screw fastening mechanism according to any one of claims 1 to 9, characterized in that, An elastic layer (151) is provided on the outer periphery of the torsion wheel (15).

13. The non-standard screw fastening mechanism according to claim 12, characterized in that, The elastic layer (151) is provided with anti-slip texture (152).

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