An automatic screw feeder

Abstract

The application relates to the field of material conveying, in particular to an automatic screw feeding machine which comprises a rack, a feeding mechanism, a cleaning mechanism and a limiting mechanism are arranged on the rack according to a screw conveying process flow, the rack is provided with a storage bin for containing screws, the limiting mechanism is arranged on the rack and located at the discharging end of the feeding mechanism, the limiting mechanism comprises a guide piece and a limiting piece, the limiting piece is rotatably arranged on the rack and abuts against the screws to limit the movement of the screws, the guide piece comprises two symmetrical guide plates arranged above the discharging end of the feeding mechanism, the two guide plates are both obliquely arranged on the rack and form guide channels which are both provided with openings, the distance between the two guide plates decreases from top to bottom, and the opening at the lower end of the guide channel is aligned with the screws at the discharging end of the feeding mechanism. The precision of screw taking by the operator can be improved, and the work efficiency can also be improved.

Description

Technical Field

[0001] This application relates to the field of material handling, and in particular to an automatic screw feeder. Background Technology

[0002] Automatic screw feeders, as crucial equipment in automated assembly technology, are widely used on production lines in industries such as electronics, home appliances, and automotive parts. With continuous advancements in industrial technology, the development of automated assembly technology has significantly improved production efficiency and product quality while effectively reducing labor costs. In modern production, screws are used extensively as connectors, and the efficiency of their automatic feeding and retrieval directly impacts the speed and stability of the overall assembly process. Therefore, developing efficient and reliable automatic screw feeders has become a vital direction for industry development. Through technological innovation, the level of production automation can be further enhanced, creating greater economic value for enterprises.

[0003] Currently, to solve the problem of automated screw conveying, small processing plants, considering cost reduction and efficiency improvement, typically adopt linear guide rail conveying. Linear guide rail conveying devices mainly consist of a linear guide rail feeding mechanism, a cleaning mechanism, and a loading mechanism. The linear guide rail uses two parallel guide plates to form a conveying gap, guiding the screws to move linearly along a predetermined path. The loading mechanism propels the screws forward through vibration or thrust. The specific working principle is as follows: screws are conveyed from the storage bin to the linear guide rail by the loading mechanism and move orderly along the linear guide rail. Screw heads that meet the requirements can be vertically locked in the conveying gap of the linear guide rail. Screw heads that are too small fall directly into the storage bin. Screw heads that are too large or have abnormal postures protrude abnormally from the two guide plates and will be cleaned by the cleaning mechanism and fall into the storage bin.

[0004] However, existing linear guide conveyor systems still have some shortcomings in practical applications. Especially for small processing plants, screws are small and difficult to handle accurately, particularly after prolonged operation. Operators are more prone to misaligning screws, affecting processing efficiency. Furthermore, when screws reach the exit of the automatic screw feeder, they may pile up, causing jamming. These issues result in less smooth screw handling, reduced work efficiency, and an inability to meet the demands for high-frequency, high-precision screw handling. Summary of the Invention

[0005] To improve the operator's accuracy in picking up screws and to increase work efficiency, this application provides an automatic screw feeder.

[0006] An automatic screw feeder includes a frame. The frame is equipped with a feeding mechanism, a conveying mechanism, and a cleaning mechanism according to the screw conveying process. The frame has a storage bin for holding screws. The automatic screw feeder also includes a limiting mechanism located on the frame at the discharge end of the conveying mechanism. The limiting mechanism includes a guide and a limiting member. The limiting member is rotatably mounted on the frame and abuts against the screw to restrict its movement. The guide includes two guide plates symmetrically positioned directly above the discharge end of the conveying mechanism. Both guide plates are inclined on the frame and form a guide channel with openings at both the top and bottom. The distance between the two guide plates decreases from top to bottom, and the opening at the lower end of the guide channel is aligned with the screw at the discharge end of the conveying mechanism.

[0007] By adopting the above technical solution, the feeding mechanism, conveying mechanism, and cleaning mechanism are arranged on the frame according to the screw conveying process, and can complete the automated conveying of screws in conjunction with the storage bin. In the automatic screw feeder, a conveying gap is formed between the two linear guide rails of the feeding mechanism to convey the screws, while the limiting mechanism set in the discharge section plays a key role. The limiting component is rotatable and abuts against the screw, which can limit the screw from continuing to move under vibration, so that the screw stays stably at the discharge position and avoids the difficulty of picking up the screw due to disordered movement. The two symmetrical and inclined guide plates of the guide component have a decreasing distance from top to bottom, and the lower opening of the guide channel is aligned with the screw. This allows the screw to be accurately guided along the guide channel during the upward picking process, correcting possible deviations and solving the problem of difficult accurate picking by manual operation for a long time in small processing plants. The limiting component and the guide component at the discharge end work together to make the screw picking smoother and meet the accuracy requirements of picking. Especially for small processing plants, this greatly improves the work efficiency of personnel and enhances practicality.

[0008] Preferably, the frame is provided with a mounting base, and both guide plates can be detachably installed on the mounting base, forming the guide channel together with the mounting base.

[0009] By adopting the above technical solution, the frame is equipped with a mounting base, and the two guide plates can be detachably installed on the mounting base, forming a guide channel with the mounting base. This facilitates the installation, removal, and replacement of the guide plates. If the guide plates show wear or damage during long-term use, they can be directly removed from the mounting base for repair or replacement without replacing the entire feeding mechanism, saving maintenance costs and time. Simultaneously, the detachable design allows for adjusting the position of the guide plates or replacing them with appropriately sized guide plates to meet the needs of different screw sizes. This enables the guide channel to better adapt to different screws, thereby improving the accuracy and stability of screw feeding, enhancing the operator's precision in screw handling, and ultimately increasing work efficiency.

[0010] Preferably, the mounting base is detachably provided with a mounting plate, and both guides are detachably mounted on the mounting plate, wherein the mounting plate is an inclined guide plane.

[0011] By adopting the above technical solution, firstly, the design of the detachable mounting plate on the mounting base and the detachable mounting of the guide structure on the mounting plate greatly enhances the flexibility of equipment installation. In practical applications, whether it is the initial installation and debugging of the equipment, the later maintenance, or adapting to different types of screws according to specific processing needs, there is no need to disassemble the entire mounting base or related structures on a large scale. Only specific mounting plates or guide components need to be operated. This modular and detachable design not only reduces the difficulty of installation but also significantly shortens the time required for installation and maintenance, improving work efficiency. Secondly, the side of the mounting base that contacts the guide plate is set as an inclined guide plane, allowing the guide plate to be stably placed and installed along this guide plane. Due to the inclined angle of the guide plane, it can better guide the guide plate to fit the mounting base, thereby forming a guide channel with a gradually decreasing distance from top to bottom between the two guide plates. The feed inlet range of this guide channel is relatively large, making it convenient for operators to pick up screws from multiple directions. Furthermore, the lower opening of this guide channel can more accurately align the screws, which is beneficial for better guiding the screws, thereby improving the operator's accuracy in picking up screws and work efficiency.

[0012] Preferably, the guide plane forms an angle with the conveying direction of the feeding mechanism toward the mounting base, and the angle ranges from 45° to 90°.

[0013] By adopting the above technical solution, the guide plane and the conveying direction of the feeding mechanism form an angle towards the mounting base, with the angle range set between 45° and 90°. When the angle is within this range, the guide plane has a suitable inclination. If the angle is too small, the guiding effect of the guide plate on the screw is not obvious, and the screw is prone to deviating from the normal path during conveying; if the angle is too large, the guiding effect of the guide channel will fail. A suitable angle ensures that the guide channel formed by the decreasing distance between the two guide plates from top to bottom provides good guidance for the screw, allowing the screw to move more accurately along the guide channel to the designated position, thereby improving the operator's accuracy in picking up screws and thus improving work efficiency.

[0014] Preferably, the distance between the two guide plates and the screw is in the range of 0.2cm-1cm.

[0015] By adopting the above technical solution, the feeding mechanism's two linear guide rails at the discharge section are equipped with a limiting mechanism. The limiting mechanism includes a guide component and a limiting component. The limiting component restricts the movement of the screw. The two guide plates of the guide component are symmetrically arranged directly above the screw and form a certain inclination angle, so that the distance between them decreases from top to bottom and the lower opening is aligned with the screw. The two guide plates are detachably installed on the mounting base and form a guide channel with the mounting base. The side of the mounting base that contacts the guide plates is an inclined guide plane. Based on this, the two guide plates maintain a distance of 0.2cm to 1cm from the screw, which can better guide the screw accurately when it is conveyed to the discharge section, prevent the screw from deviating, thereby improving the operator's accuracy in picking up the screw, reducing the situation of screw stacking and jamming, and thus improving work efficiency.

[0016] Preferably, the mounting plate further includes a first fastener and a second fastener. The mounting plate is provided with a first through hole, and both guide plates are provided with second through holes. The first fastener cooperates with the first through hole to fasten the mounting plate and the mounting base, and the second fastener cooperates with the second through hole to fasten the mounting plate and the guide plate.

[0017] By adopting the above technical solution, the fastening structure of the mounting plate, mounting base, and guide plate is ingeniously designed and offers significant advantages. The mounting plate and mounting base are fastened by the first fastener engaging with the first through hole on the mounting plate, and the mounting plate and guide plate are fastened by the second fastener engaging with the second through hole on the guide plate. This greatly improves the efficiency of equipment assembly and disassembly, allows for quick maintenance, and saves time and labor costs. The precise through-hole positioning and tight fit of the fasteners ensure a stable and reliable connection, effectively resisting external forces during operation, reducing the risk of equipment failure, and ensuring stable operation. The standardized through-hole design gives the components high versatility, facilitating flexible selection and replacement, and enabling subsequent functional expansion to meet diverse production needs. During the commissioning phase, the position and angle of the components can be easily adjusted, and performance can be easily optimized during long-term operation, reducing replacement costs and providing strong support for the efficient operation and continuous upgrading of the equipment.

[0018] Preferably, both the first through hole and the second through hole are elongated through holes, and the distance between the two second through holes decreases from top to bottom.

[0019] By adopting the above technical solution, the first and second through holes are designed as elongated strips, allowing the guide plate and mounting plate to be adjusted in position according to actual needs during installation. Because both the elongated first and second through holes provide a certain amount of space, different sizes or specifications of screws have different requirements for the guide channel dimensions during guide plate installation. The guide plate position can be flexibly adjusted to change the guide channel dimensions, thus enabling the guide channel to better accommodate screws of different specifications, thereby improving the compatibility of the automatic screw feeder with different screws.

[0020] Preferably, the limiting component includes a rotating component and a limiting plate. The rotating component is mounted on the frame, and the limiting plate is connected to the rotating component to enable the rotation of the limiting plate. The limiting plate abuts against the screw to restrict the movement of the screw. When the screw is removed, the screw pushes the limiting plate to rotate so that the screw can be removed.

[0021] By adopting the above technical solution, the rotating component in the limiting component is installed on the frame, and the limiting plate is rotatably connected to the rotating component. Under normal circumstances, the limiting plate abuts against the screw. This abutting action restricts the screw from continuing to be conveyed, preventing the screw from moving or piling up before it is picked up and causing jamming. When the screw needs to be picked up, force is applied to the screw to push the limiting plate. Because the limiting plate is rotatable after being connected to the rotating component, the limiting plate will rotate, so that the screw can be picked up smoothly, ensuring the smoothness of the screw picking process, thereby improving the operator's accuracy and work efficiency in picking up screws.

[0022] Preferably, the side of the limiting plate that abuts against the screw is a convex arc surface.

[0023] By adopting the above technical solution, the convex arc surface of the limiting plate can minimize the contact area with the screw when it abuts. Compared with flat contact, the reduced contact area between the convex arc surface and the screw not only stably restricts the movement of the screw, but also better prevents the screw from accidentally sliding or shaking before it is removed, ensuring that the screw is in a stable and ready-to-use state. When the screw is removed, due to the special shape of the convex arc surface, the screw can more smoothly push open the limiting plate and rotate under force, thus facilitating the removal of the screw and effectively improving the operator's accuracy and work efficiency in screw removal.

[0024] Preferably, the feeding mechanism includes two linear guide rails, with a conveying gap between the two linear guide rails, and multiple baffles are spaced apart between the two linear guide rails. The distance between adjacent baffles is greater than the outer diameter of the screw shank and less than the outer diameter of the screw head.

[0025] By adopting the above technical solution, since the distance between adjacent baffles is greater than the outer diameter of the screw shank but smaller than the outer diameter of the screw head, only the screw shank can smoothly pass through the space between adjacent baffles in the conveying gap of the linear guide, while the screw head will be blocked by the baffles. In this way, the screw can only move forward in a specific posture during the conveying process, avoiding the screw from rolling randomly or becoming disoriented within the conveying gap. This ensures the orderly delivery of screws and improves the accuracy and efficiency of subsequent operators in picking up screws.

[0026] In summary, this application includes at least one of the following beneficial technical effects:

[0027] 1. A limiting mechanism is set in the discharge section of the feeding mechanism. The limiting component of the limiting mechanism is rotatably mounted on the frame and abuts against the screw. In this way, during the screw conveying process, the limiting component can restrict the continuous movement of the screw and prevent the screw from stacking in the discharge section due to continuous advancement. This prevents the screw from stacking and causing jamming, making the screw picking smoother and thus improving work efficiency.

[0028] 2. A limiting mechanism is set in the discharge section of the feeding mechanism. The guide components of the limiting mechanism are two guide plates symmetrically arranged directly above the screw. The distance between the two guide plates decreases from top to bottom. The opening at the lower end of the guide channel is aligned with the screw. When the operator picks up the screw, the guide channel formed by the guide plate can play a guiding role, helping the operator to accurately position the screw, thereby improving the accuracy of screw picking. Attached Figure Description

[0029] Figure 1 This is a structural schematic diagram of an automatic screw feeder according to this application;

[0030] Figure 2 This is a front view of an automatic screw feeder according to this application;

[0031] Figure 3 This is a right view of an automatic screw feeder according to this application.

[0032] Explanation of reference numerals in the attached drawings: 1. Frame; 2. Feeding mechanism; 3. Feeding mechanism; 4. Cleaning mechanism; 5. Storage bin; 6. Limiting mechanism; 11. Mounting base; 12. Mounting plate; 13. First fastener; 14. Second fastener; 31. Linear guide rail; 32. Conveying gap; 61. Limiting component; 62. Guide component; 121. First through hole; 611. Limiting plate; 612. Rotating component; 621. Guide plate; 622. Guide channel; 6211. Second through hole. Detailed Implementation

[0033] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0034] This application provides an automatic screw feeder, which, according to an embodiment, is described below. Figure 1The system includes a frame 1 and a loading mechanism 2, a feeding mechanism 3, a cleaning mechanism 4, and a limiting mechanism 6 mounted on the frame 1. A storage bin 5 for holding screws is located in the middle of the frame 1. The loading mechanism 2 is located at the rear end of the storage bin 5 to transport screws to the feeding mechanism 3. The feeding mechanism 3 is installed inside the storage bin 5 and above the screws at the bottom of the storage bin 5 for conveying screws. The cleaning mechanism 4 is installed inside the storage bin 5 and directly above the feeding mechanism 3 to clean screws in abnormal positions from the feeding mechanism 3. The frame 1 also includes the loading mechanism 2, feeding mechanism 3, and cleaning mechanism 4. The storage bin 5 for holding screws is located at the bottom of the storage bin 5. The limiting mechanism 6 is installed on the frame 1 and located at the outlet of the feeding mechanism 3 to improve the accuracy of screw handling.

[0035] The feeding mechanism 2 in this embodiment mainly includes a power unit and a turntable. The turntable is vertically installed at the rear end of the storage bin 5. The bottom of the storage bin 5 is inclined downwards towards the turntable, which facilitates the concentration of screws near the turntable. Several arched push plates with arcs are arranged circumferentially on the inner sidewall of the turntable. When the turntable rotates, these arched push plates continuously drive the screws at the bottom of the storage bin 5 upwards to the feed inlet of the feeding mechanism 3. A rack is provided circumferentially on the outer side of the turntable. The rack, in conjunction with the power unit, enables rotation. During operation, the power unit drives the turntable to rotate, and the arched push plates move the screws, carrying some screws to a high position where they fall freely. Some screws will fall into the feeding mechanism 3 in a forward-facing position and form an alignment, while screws with mismatched orientations will fall into the storage bin 5 for subsequent cleaning. As a common feeding device, it will not be described in detail here.

[0036] In this embodiment, the feeding mechanism 3 receives the screws conveyed by the feeding mechanism 2 and further conveys them to the discharge end. The core of the feeding mechanism 3 is two parallel, spaced linear guide rails 31. The feeding mechanism 3 is driven by a vibrating motor, causing the screws to be pushed orderly towards the discharge port at a certain frequency. These rails are made of metal, such as aluminum alloy or stainless steel, with smooth surfaces to reduce friction during screw movement. The conveying gap 32 between the two linear guide rails 31 serves as a channel for screw movement; its size is determined according to the screw size to ensure smooth passage. The feed end of the linear guide rails 31 is equipped with two inclined baffles in a "V" shape, which facilitates the gathering of screws and guides them to fall into the conveying gap 32. As a common feeding mechanism, it will not be described in detail here.

[0037] In addition, in this embodiment, the two linear guide rails 31 are equipped with multiple baffles at intervals. The baffles are located within the conveying gap 32, and the distance between two adjacent baffles is greater than the outer diameter of the screw shank but less than the outer diameter of the screw head. This ensures that only one screw can be accommodated between two baffles, effectively separating the screws and preventing them from accumulating at the discharge end and causing jamming, thus affecting the smoothness of screw retrieval. The baffles can be made of rubber or plastic. Rubber has a certain degree of elasticity and can act as a buffer; plastic is relatively lightweight. These baffles can prevent the screws from rolling or tipping disorderly within the conveying gap 32, keeping the screws in a relatively orderly arrangement, facilitating subsequent conveying and retrieval.

[0038] Specifically, the cleaning mechanism 4 is installed inside the storage bin 5 to clean screws on the linear guide rail 31 that are not arranged in the specified posture, preventing them from affecting the conveying of other screws and reducing jamming. The cleaning mechanism 4 mainly consists of a scraper assembly and a cleaning drive assembly. During operation, the cleaning drive assembly drives the scraper assembly to swing left and right, sweeping the misaligned screws on the linear guide rail 31 into the storage bin 5, reducing jamming, minimizing downtime for maintenance, and improving work efficiency.

[0039] Specifically, the limiting mechanism 6 includes a limiting component 61 and a guide component 62. The guide component 62 includes two elongated guide plates 621 symmetrically arranged directly above the screw. The guide plates 621 can be made of plastic or metal. Plastic is lightweight and inexpensive, while metal is more robust and durable. Both guide plates 621 are inclined on the frame 1, and the distance between them decreases from top to bottom, thus forming a guide channel 622 that is wider at the top and narrower at the bottom. The opening at the lower end of the guide channel 622 is aligned with the screw to facilitate precise guidance of the tool to the screw's position.

[0040] Specifically, the frame 1 is provided with a mounting base 11, a mounting plate 12, a first fastener 13, and a second fastener 14. The mounting plate 12 is detachably mounted to the mounting base 11 via the first fastener 13, and the guide plate 621 is detachably mounted to the mounting plate 12 via the second fastener 14. The mounting plate 12 is provided with an elongated first through hole 121 and an elongated second through hole 6211. The first fastener 13 is fastened by cooperating with the first through hole 121, and the second fastener 14 is fastened by cooperating with the second through hole 6211. In this embodiment, both the first fastener 13 and the second fastener 14 are bolts.

[0041] In this embodiment, the two elongated second through holes 6211 are designed to be wider at the top and narrower at the bottom, which facilitates the adjustment of the distance between the guide plate 621 and the screw to accommodate different screw sizes. Simultaneously, it ensures that the feed inlet of the guide channel 622 is easily accessible for the screw-picking tool. Specifically, when the screw size is large, the screw head protrudes significantly from the surface of the linear guide rail 31. The bolts can be loosened to move the guide plate 621 upwards along the inclined elongated second through holes 6211, and then the bolts can be tightened to increase the distance between the two guide plates 621 and the screw. Alternatively, the installation position of the mounting plate 12 can be adjusted to ensure that the opening of the guide channel 622 formed between the two guide plates 621 remains unchanged, while simultaneously meeting the processing requirements of different screw sizes. Furthermore, the guide plate 621 can be adjusted appropriately inwards or outwards through the second through holes 6211, allowing the outlet size of the guide channel 622 to be adjusted according to the outer diameter of the screw head, better guiding the tool to achieve precise screw picking.

[0042] Furthermore, the two guide plates 621 and the mounting plate 12 form a guide channel 622 that facilitates the operator's alignment of the screw. The mounting plate 12 is an inclined guide plane, which forms an angle with the linear guide rail 31 towards the mounting base 11, with the angle ranging from 45° to 90°, making the guide channel 622 funnel-shaped. Within this angle range, it allows the operator to accurately guide the tool to pick up the screw over a relatively large area. In particular, the distance between the two guide plates 621 and the screw ranges from 0.2cm to 1cm. This distance ensures that the guide plates 621 are neither too far from the screw and lose their guiding function, nor too close and obstruct the screw's movement.

[0043] Specifically, the limiting mechanism 6's limiting component 61 includes a crescent-shaped limiting plate 611 and a rotating component 612. In this embodiment, the rotating component 612 adopts a torsion spring structure. The torsion spring is installed on the frame 1 and located on one side of the linear guide rail 31. The connection between the limiting plate 611 and the torsion spring relies on the elastic deformation of the torsion spring itself, causing the limiting plate 611 to rotate relative to the linear guide rail 31. The limiting plate 611 abuts against the screw, restricting the screw's movement. The concave arc surface of the crescent-shaped limiting plate 611 faces the exit direction, while the side abutting the screw is a convex arc surface. This crescent-shaped limiting plate 611 can effectively limit the screw and facilitate convenient screw removal. Specifically, when a screw is removed, the screw pushes the limiting plate 611 to rotate, causing the limiting plate 611 to lose its restriction on the screw, thereby accurately and quickly removing the screw. Furthermore, the torsion spring can automatically reset, ensuring that each screw is spaced apart and avoiding accumulation.

[0044] The implementation principle of this embodiment is as follows: The screws are placed in the storage bin 5, which is inclined in the middle of the frame 1. The power component of the feeding mechanism 2 drives the turntable to rotate. The turntable is located at the rear end of the storage bin 5. The arched push plate on its inner side wall rotates with the turntable to transport the bottom screws upward to the feeding port of the feeding mechanism 3. Some screws fall into the feeding mechanism 3 in the forward direction to form an arrangement, while those with mismatched postures fall back into the storage bin 5. Then, the feeding mechanism 3 drives two parallel and spaced metal linear guide rails 31 with a vibration motor to push the screws to the discharge port in an orderly manner. The "V" shaped baffle at the feeding end of the rail guides the screws into the conveying gap 32. Multiple rubber or plastic baffles are set in the gap. Because the distance between adjacent baffles is greater than the outer diameter of the screw and less than the outer diameter of the screw head, the screws are separated and kept in an orderly arrangement to prevent disorderly rolling or tipping.

[0045] Subsequently, the cleaning drive assembly of the cleaning mechanism 4 drives the scraper assembly to swing left and right, sweeping the screws on the linear guide rail 31 that are not arranged in the specified posture off into the storage bin 5, reducing material jamming. Finally, the screws reach the discharge port of the feeding mechanism 3. Two long strip-shaped guide plates 621 made of plastic or metal in the guide component 62 of the limiting mechanism 6 are inclinedly set directly above the screws. The distance between the two is wider at the top and narrower at the bottom, forming a guide channel 622. Detachable installation is achieved through the inclined long strip-shaped through holes on the mounting plate 12 and the guide plate 621 and bolts. The mounting plate 12 is an inclined guide plane and forms a 45° angle with the linear guide rail. A 90° angle makes the guide channel 622 funnel-shaped, with a distance of 0.2cm-1cm between the guide plate 621 and the screw, facilitating the use of the guide tool to pick up the screw. The guide plate 621 can be adjusted to accommodate different screw models. Meanwhile, the crescent-shaped limiting plate 611 of the limiting member 61 is connected to the frame 1 via a torsion spring. Its concave arc surface faces the outlet direction, and its contact surface with the screw is a convex arc surface, restricting the screw's movement. When picking up the screw, the screw pushes the limiting plate 611 to rotate, achieving precise and rapid screw removal. The above are preferred embodiments of this application, but are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be included within the scope of protection of this application.

Claims

1. An automatic screw feeder, comprising a frame (1), wherein the frame (1) is provided with a feeding mechanism (2), a conveying mechanism (3), and a cleaning mechanism (4) according to the screw conveying process, and the frame (1) is provided with a storage bin (5) for holding screws, characterized in that, It also includes a limiting mechanism (6), which is set on the frame (1) and located at the discharge end of the feeding mechanism (3). The limiting mechanism (6) includes a guide (62) and a limiting member (61). The limiting member (61) is rotatably set on the frame (1) and abuts against the screw to limit the movement of the screw. The guide (62) includes two guide plates (621) symmetrically set directly above the discharge end of the feeding mechanism (3). The two guide plates (621) are inclined on the frame (1) and form a guide channel (622) with openings at both the top and bottom. The distance between the two guide plates (621) decreases from top to bottom, and the opening at the lower end of the guide channel (622) is aligned with the screw at the discharge end of the feeding mechanism (3).

2. The automatic screw feeder according to claim 1, characterized in that, The frame (1) is provided with a mounting base (11), and the two guide plates (621) can be detachably installed on the mounting base (11) and together with the mounting base (11) form the guide channel (622).

3. An automatic screw feeder according to claim 2, characterized in that, The mounting base (11) is detachably provided with a mounting plate (12), and both guides are detachably mounted on the mounting plate (12). The mounting plate (12) is an inclined guide plane.

4. An automatic screw feeder according to claim 3, characterized in that, The guide plane forms an angle with the conveying direction of the feeding mechanism (3) toward the mounting base (11), and the angle ranges from 45° to 90°.

5. An automatic screw feeder according to claim 3, characterized in that, The distance between the two guide plates (621) and the screw ranges from 0.2cm to 1cm.

6. An automatic screw feeder according to claim 3, characterized in that, The mounting plate (12) further includes a first fastener (13) and a second fastener (14). The mounting plate (12) is provided with a first through hole (121), and both guide plates (621) are provided with second through holes (6211). The first fastener (13) cooperates with the first through hole (121) to fasten the mounting plate (12) and the mounting base (11), and the second fastener (14) cooperates with the second through hole (6211) to fasten the mounting plate (12) and the guide plate (621).

7. An automatic screw feeder according to claim 6, characterized in that, Both the first through hole (121) and the second through hole (6211) are elongated through holes, and the distance between the two second through holes (6211) decreases from top to bottom.

8. An automatic screw feeder according to claim 1, characterized in that, The limiting member (61) includes a rotating member (612) and a limiting plate (611). The rotating member (612) is mounted on the frame (1). The limiting plate (611) is connected to the rotating member (612) to realize the rotation of the limiting plate (611). The limiting plate (611) abuts against the screw to restrict the movement of the screw. When the screw is taken out, the screw pushes the limiting plate (611) to rotate so that the screw can be taken out.

9. An automatic screw feeder according to claim 8, characterized in that, The side of the limiting plate (611) that abuts against the screw is a convex arc surface.

10. An automatic screw feeder according to claim 1, characterized in that, The feeding mechanism (3) includes two linear guide rails (31), a conveying gap (32) is formed between the two linear guide rails (31), and multiple baffles are spaced apart between the two linear guide rails (31). The distance between adjacent baffles is greater than the outer diameter of the screw rod and less than the outer diameter of the screw head.

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