Self-suction batch head

Abstract

The utility model relates to screw tightening device technical field, especially, a kind of self-sucking batch head, including integrated structure or split type batch head body, batch head body has driving end and handle end, and at least one gas passage is equipped along its axial direction.The driving end has the driving pattern for engaging with screw head recess to transmit torque, and the flange around the driving pattern.When negative pressure is applied, the driving end and the recess of the screw form a closed space, and the adsorption force can be directly generated inside the screw recess to hold the screw.And, the flange is in contact with the outer edge of the screw head to ensure the perpendicularity when the screw is adsorbed.The utility model solves the problem that mushroom head and other non-planar head screws are easily clamped when self-sucking, and the adsorption perpendicularity cannot be guaranteed.The utility model also highly integrates adsorption and driving functions, and the structure is compact, the working outer diameter can be less than or equal to the outer diameter of the screw head, and can adapt to deep hole, narrow slot and other narrow space operations.

Description

Technical Field

[0001] This utility model relates to the field of screw tightening device technology, and in particular to a self-priming screwdriver bit. Background Technology

[0002] In automated production lines, especially in the assembly processes of electronic products and precision instruments, the rapid and precise positioning and tightening of screws is a critical process. Traditional screw tightening methods mainly rely on magnetic bits or mechanical grippers. Magnetic bits are only suitable for ferromagnetic screws and cannot attract non-magnetic screws such as stainless steel, copper, and aluminum. Furthermore, their magnetic fields may interfere with sensitive electronic components. Mechanical grippers, on the other hand, are complex in structure, bulky, and may damage the screw or workpiece surface during operation. To solve these problems, vacuum adsorption technology has been introduced into the screw tightening process. This technology uses negative pressure to attract screws and has advantages such as wide applicability (not limited by screw material), precise positioning, and no damage to the workpiece, making it one of the mainstream solutions in high-precision assembly.

[0003] However, existing vacuum-adsorption screw tightening devices suffer from general limitations in their structural design. Chinese patent document CN112571034A discloses a vacuum-adsorption screw tightening device. To address the wear problem of the sealing ring during rotation, this device employs a functional separation design. Specifically, it includes a fixed, non-rotating external "screw vacuum suction tube," the end of which covers the screw head, forming a seal through contact with the top surface of the screw head to achieve vacuum adsorption. Inside this fixed suction tube, an independent "screw tightening gun" rotates to drive the screw to tighten. While this internal and external separation design effectively extends the lifespan of the seal, it also introduces a structural defect: the outer diameter of the overall working part, the "screw vacuum suction tube," must be larger than the outer diameter of the screw head it adsorbs. This design results in an overly large head size for the entire device, requiring a significant amount of space around the screw head during operation, making it unsuitable for working in confined spaces such as deep holes and narrow grooves.

[0004] More importantly, this type of technology, which relies on a flat flange surface or a straight section of the screw head for positioning and adsorption, can typically only self-adsorb screws with flat heads. For screws with uneven or curved head surfaces, such as mushroom-head screws, the lack of a flat flange surface for positioning prevents the adsorption surface from forming an effective pneumatic seal. During self-adsorption, the adsorption force is weak and unstable, easily leading to the screw being clamped crookedly. Therefore, current technologies struggle to address the issue of ensuring adsorption perpendicularity in the absence of a flat flange surface, especially for mushroom-head screws. Utility Model Content

[0005] In order to solve the above-mentioned technical problems in the prior art, this utility model provides a self-priming screwdriver bit, which aims to solve the problem that it is easy to clamp crooked and cannot guarantee the verticality of adsorption when self-priming non-planar head screws such as mushroom heads.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows: A self-priming screwdriver bit includes a bit body, one end of which is a drive end. The center of the drive end is provided with a drive flower pattern for cooperating with the groove of the screw head to transmit torque. The other end of the bit body is a shank end, which is used to connect to the drive tool; An axial air passage is provided inside the bit body, the air passage connecting the shank end and the drive end and forming an air passage outlet; A flange is disposed on the end face of the drive end and surrounds the drive flower pattern. The flange is configured as a positioning structure, the end face of which is used to form contact with the outer edge of the head of the screw when the screw is adsorbed, so as to axially position the screw and thus ensure the adsorption perpendicularity.

[0007] Furthermore, the bit body can be a one-piece structure or a split structure.

[0008] Furthermore, the end face of the flange is a plane, an arc surface, or a contoured surface that matches the profile of the adapted screw head.

[0009] Furthermore, the geometric configuration of the driving flower pattern includes cross-shaped, plum blossom-shaped, hexagonal, straight, inner hexagonal, square, and triangular flower patterns.

[0010] Furthermore, the bit body has a segmented structure.

[0011] Furthermore, the bit body is provided with a first section, a second section, and a third section sequentially from the drive end to the shank end; The first, second, and third segments are all cylindrical.

[0012] Furthermore, the first segment constitutes part of the drive end, and the third segment constitutes the handle end; The second section is provided with radial air passages.

[0013] Furthermore, the air passage has an air passage outlet, which is located inside the drive flower pattern or on the end face of the flange.

[0014] Furthermore, the number of outlets of the air passage is at least one.

[0015] Furthermore, the number, size, and shape of the air passage outlets can be adjusted according to the type of screws used.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The core innovation of this self-priming screwdriver bit lies in the flange positioning structure at the drive end. When a mushroom-head screw is engaged, a vacuum negative pressure is transmitted through the bit, while the external flange structure forms a stable line contact with the nut portion of the mushroom-head screw. This design not only ensures a tight fit between the bit end and the nut, forming a good pneumatic seal to generate sufficient adsorption force, but more importantly, it ensures the perpendicularity after engagement, solving the problem of easily misaligning mushroom-head screws in existing technologies.

[0017] This invention provides a self-priming screwdriver bit that integrates the adsorption and driving functions into the bit body, unlike the external adsorption sleeve structure in existing technologies. The outer diameter of the bit body can be designed to be less than or equal to the outer diameter of the screw head, allowing it to easily access confined spaces such as deep holes and narrow grooves that are inaccessible to traditional vacuum adsorption devices. Under specific requirements, it can also be designed to be larger than the screw head outer diameter, greatly expanding the application range of vacuum adsorption tightening bits.

[0018] This utility model provides a self-priming screwdriver bit, designed as an integrated or split structure. Compared to the complex mechanisms in existing technologies, which consist of multiple parts such as inner and outer tubes, sealing rings, and springs, its structure is greatly simplified. This not only reduces manufacturing costs and failure rates but also makes replacement and maintenance more convenient, improving the reliability and efficiency of the production line. Furthermore, it can be customized according to different screw sizes and weights, incorporating multiple air passages and increasing adsorption points, significantly enhancing the adsorption force on screws and ensuring stable and reliable adsorption even for large or heavy screws, preventing them from falling off. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0021] Figure 2 This is a schematic diagram of the driver end of one embodiment of the present invention.

[0022] Figure 3 This is a schematic diagram of the internal cross-section of the present invention.

[0023] The annotations in the attached figures are explained as follows: 100-Bit body, 110-Drive end, 111-Drive pattern, 112-Flange, 120-Stalk end, 130-Air passage, 131-Air passage outlet, 140-Air hole. Detailed Implementation

[0024] The technical solution of this utility model will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are not all embodiments of this utility model. All other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0025] It should be noted that, unless otherwise specifically stated, the relative arrangement and numerical expressions of the components and steps described in these embodiments should not be construed as limiting the scope of this utility model.

[0026] The following description of exemplary embodiments is merely illustrative and is not intended to limit the present invention or its application or use in any way. Techniques, methods, and apparatus known to those skilled in the art may not be discussed in detail herein, but where applicable, such techniques, methods, and apparatus should be considered part of this specification.

[0027] This embodiment provides a self-priming bit, such as Figure 1 As shown, it includes a bit body 100. The bit body 100 can be a one-piece structure or a split structure. The bit body 100 has a three-section stepped cylindrical structure, including a first section, a second section, and a third section connected sequentially from front to back along its axial direction. All three sections are cylindrical, and the diameter of each section can be designed according to actual application requirements. In this preferred embodiment, the first section forms the front of the drive end 110, with the smallest outer diameter to adapt to confined spaces. The drive end 110 is used to directly engage with the head groove of the screw. The third section forms the shank end 120, which is used to connect to an automated device (not shown).

[0028] like Figure 2As shown, the drive end 110 is the core of this invention. A drive pattern 111 is provided at the center of its end, which engages with the head groove of the screw to transmit torque. In this embodiment, the drive pattern 111 of the drive end 110 is cross-shaped to accommodate common cross-head screws. However, this invention is not limited to this; the geometry of the drive pattern 111 can be customized according to actual needs, for example, it can be designed as a star-shaped, hexagonal, slotted, internal hexagonal, square, triangular, or other internal polygonal pattern to be compatible with different types of screws. A flange 112 is provided around the drive pattern 111 on the end face of the drive end 110. The end face of this flange 112 forms a positioning structure for stable contact with the outer edge of the screw head (especially a mushroom-head screw) when the screw is attracted.

[0029] like Figure 3 As shown, an axial venting channel 130 is provided inside the bit body 100. This venting channel 130 extends from the shank end 120 to the drive end 110, and at least one venting channel outlet 131 is formed at the head of the drive end 110. At least one radial venting hole 140 is provided on the shank end. The venting channel 130 communicates with the venting hole 140, which is connected to an external vacuum source (negative pressure generating device) via an air connector, allowing negative pressure to act on the entire venting channel 130.

[0030] During operation, when the drive end 110 approaches the screw to be attracted, the drive pattern 111 aligns with and inserts into the head groove of the screw. Simultaneously, the end face of the surrounding flange 112 forms a line contact with the outer edge of the screw head's arc surface. This contact not only provides reliable positioning but also ensures the coaxial alignment of the screw axis and the bit axis, thereby ensuring the perpendicularity of the attraction and preventing misalignment.

[0031] Due to the joint action of the end faces of the drive flower 111 and flange 112 with the inner wall of the screw groove and the outer edge of the head, not only is mechanical engagement for torque transmission achieved, but a relatively sealed space is also formed between the drive end and the screw head. At this time, the vacuum system is activated, and negative pressure is transmitted to the drive end through the air passage 130. Air is extracted from this sealed space, thereby generating a negative pressure adsorption force in the screw head groove, which firmly adsorbs and stably holds the screw on the drive end 110.

[0032] Furthermore, since the adsorption and driving functions are fully integrated into the bit body 100, no external adsorption sleeve is required. Therefore, the outer diameter of the bit body 100 can be designed to be very small, even smaller than or equal to the outer diameter of the screw head it is adapted to. This allows the bit body 100 to operate in confined spaces inaccessible to traditional vacuum adsorption devices, and it is also suitable for small screws up to M2 size, solving the industry's problem of difficulty in adsorbing and tightening small screws. In applications without space limitations, it can also be designed to be larger than the outer diameter of the screw head to increase the overall strength of the bit.

[0033] As different embodiments of this utility model, the air passage outlet 131 can be disposed inside the drive flower pattern 111 or disposed on the end face of the flange 112, depending on design requirements. To optimize adsorption performance, the shape, distribution, and number of the air passage outlet 131 can be optimized. The number of air passage outlets 131 can be one or more, to meet the needs of processing large, heavy screws or situations requiring higher adsorption stability. Preferred distribution schemes may include: multiple air passage outlets 131 evenly distributed in a ring along the end face of the flange 112; or a single air passage outlet 131 disposed in the middle of the drive flower pattern 111; or one or more air passage outlets 131 disposed in the middle of the drive flower pattern 111 and fitted with one or more small holes evenly distributed in a ring on the end face of the flange 112, etc. Specifically, for the preferred cross-shaped screwdriver bit of this embodiment, such as... Figure 2 As shown, four air passage outlets 131 can be evenly distributed in a ring array around the end of the drive flower 111. By increasing the number of air passage outlets 131, the total air passage area can be increased, thereby generating a stronger and more uniform negative pressure adsorption force, ensuring that the screw can be stably held during movement and rotation. In addition, the shape of the air passage outlet 131 can be a circular hole, a square hole, or a linear slit hole, etc., and the size (such as the aperture) of the air passage outlet 131 can also be customized according to different screw models to optimize adsorption performance.

[0034] The application process of this utility model on an automated production line is as follows: 1. Select a self-priming bit of the appropriate pattern and size according to the specifications of the screw to be tightened, install it on the drive shaft of the automated equipment, and connect the air passage 140 to the vacuum line.

[0035] 2. During operation, insert the drive end 110 into the head groove of the screw to be tightened. At the same time, the vacuum system is activated to generate negative pressure, and the screw is attracted to the bit body 100 by the positioning of the flange 112 and the suction force transmitted by the air passage 130.

[0036] 3. Move the bit body 100 with the screw attached to the target hole of the workpiece, and then start the rotation to tighten the screw to the preset torque.

[0037] 4. After the screw is tightened, the vacuum system is turned off, the negative pressure disappears, the bit separates from the screw, and then returns to the next work cycle.

[0038] The above specific embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A self-priming screwdriver bit, comprising a bit body, one end of which is a drive end, wherein the drive end has a drive flower pattern at its center for engaging with a groove in the screw head to transmit torque; The other end of the bit body is a shank end, which is used to connect to the drive tool; Its features are: An axial air passage is provided inside the bit body, the air passage connecting the shank end and the drive end and forming an air passage outlet; A flange is disposed on the end face of the drive end and surrounds the drive flower pattern. The flange is configured as a positioning structure, the end face of which is used to form contact with the outer edge of the head of the screw when the screw is adsorbed, so as to axially position the screw and thus ensure the adsorption perpendicularity.

2. The self-priming bit according to claim 1, characterized in that: The bit body can be a one-piece structure or a split structure.

3. The self-priming bit according to claim 1, characterized in that: The end face of the flange is a plane, an arc surface, or a contoured surface that matches the profile of the screw head to which it is adapted.

4. A self-priming bit according to claim 1, characterized in that: The geometric configurations of the driving flower patterns include cross-shaped, plum blossom-shaped, hexagonal, straight, inner hexagonal, square, and triangular flower patterns.

5. A self-priming screwdriver bit according to claim 1, characterized in that: The bit body has a segmented structure.

6. A self-priming bit according to claim 5, characterized in that: The bit body is provided with a first section, a second section and a third section in sequence from the drive end to the shank end; The first, second, and third segments are all cylindrical.

7. A self-priming bit according to claim 6, characterized in that: The first segment constitutes part of the drive end, and the third segment constitutes the handle end; The second section is provided with radial air passages.

8. A self-priming bit according to claim 1, characterized in that: The air passage has an air passage outlet, which is located inside the drive flower pattern or on the end face of the flange.

9. A self-priming bit according to claim 8, characterized in that: The number of outlets of the air passage is at least one.

10. A self-priming bit according to claim 9, characterized in that: The number, size, and shape of the air passage outlets can be adjusted according to the type of screws used.

Images