A screw with reinforced teeth

Abstract

The utility model relates to the field of screw, and disclose a kind of screw with reinforcing tooth, including screw head, stem assembly and drill bit, stem assembly is composed of diameter gradually changed rear end rod, midsection rod and front end rod, adopt arc transition connection between each rod section, front end rod is equipped with sharp teeth for pre-cutting material, midsection rod is arranged barbed tooth to prevent reverse loosening, rear end rod is provided with wide flat saw tooth to enhance occlusal force, V-shaped groove is opened between adjacent saw teeth to assist chip removal, screw head is built-in fixed mechanism, including slidable pressing block, cross slot, spring and clamping jaw, double anti-loosening is realized by tool pressing trigger clamping jaw to expand, the waterproof function is provided by the clamping structure of boss and sealing ring, the utility model realizes progressive locking by sectional reinforcing tooth, has self-tapping drilling, anti-vibration loosening and environmental sealing function, suitable for high dynamic load working condition, solve the problem such as traditional screw anti-loosening ability deficiency, installation cumbersome.

Description

Technical Field

[0001] This utility model relates to the field of screws, specifically a screw with reinforcing teeth. Background Technology

[0002] In mechanical assembly, building installation, and equipment fixing scenarios, traditional smooth rods or single-threaded screws often loosen due to vibration, impact, or material deformation, which can even lead to problems such as component detachment and equipment failure. Therefore, screws with reinforced teeth are needed to compensate for the shortcomings of traditional connection methods in terms of biting force and anti-loosening reliability through the mechanical locking effect of the tooth structure, so as to meet the requirements of high-stability connection.

[0003] Traditional screws typically employ a single thread structure, which limits their anti-loosening capabilities. Especially under conditions of frequent vibration or high impact loads, the frictional resistance between the thread and the substrate is easily disrupted, causing the screw to gradually loosen. Furthermore, traditional self-tapping screws often require pre-drilling during installation, which is cumbersome and inefficient. While ordinary anti-loosening screws can improve the anti-loosening effect, their complex structure makes it difficult to ensure sealing performance. Therefore, we propose a screw with reinforced teeth. Utility Model Content

[0004] In view of the shortcomings of the prior art, this utility model provides a screw with reinforcing teeth, which solves the above-mentioned problems.

[0005] To achieve the above-mentioned objectives, this utility model provides the following technical solution: a screw with reinforcing teeth, comprising a screw head, a rear end rod, a middle section rod, a front end rod, a drill bit, and a boss. The bottom surface of the screw head is coaxially fixedly mounted with the boss. The bottom surface of the boss is coaxially fixedly mounted with the rear end rod. The bottom surface of the rear end rod is coaxially fixedly mounted with the middle section rod. The bottom surface of the middle section rod is coaxially fixedly mounted with the front end rod. The bottom surface of the front end rod is connected to the drill bit. The rear end rod, the middle section rod, and the front end rod together constitute a rod assembly, and the rod assembly is provided with a reinforcing tooth structure; The upper surface of the screw head is provided with a placement groove, and a fixing mechanism is provided in the placement groove.

[0006] Preferably, the reinforced tooth structure includes spiked teeth, and the front end rod is circumferentially equipped with spiked teeth, with the tips of the spiked teeth facing the drill bit.

[0007] Preferably, the reinforcing tooth structure further includes barbed teeth, and the middle section rod is circumferentially equipped with barbed teeth, with the tips of the barbed teeth facing the screw head.

[0008] Preferably, the reinforcing tooth structure further includes wide flat saw teeth and V-shaped grooves. Wide flat saw teeth are installed on the circumference of the rear end rod. The cross-section of the wide flat saw teeth is trapezoidal. V-shaped grooves are formed between two adjacent wide flat saw teeth on the circumference of the rear end rod.

[0009] Preferably, the diameters of the rear end rod, the middle section rod, and the front end rod gradually increase, and the connection points are smooth arc transitions; The pitch of the spiked teeth, the barbed teeth, and the wide flat saw teeth gradually decreases.

[0010] Preferably, the fixing mechanism includes a pressure block, a cross groove, and a second spring. The second spring is symmetrically fixedly installed on the bottom of the placement groove on the screw head. The pressure block is installed on the second spring and is slidably connected to the screw head on the same axis. The upper surface of the pressure block is provided with a cross groove. The outer arc surface of the pressure block is symmetrically fixed with hinge seats near the top, and a connection hole is opened on the lower part of the outer arc surface of the pressure block corresponding to the hinge seat. The two opposite sides of the top of the screw head are inclined; The sidewalls of the grippers correspond to the inclined portion of the screw head.

[0011] Preferably, the fixing mechanism includes a pressure block, a cross groove, and a second spring. The second spring is symmetrically fixedly installed on the bottom of the placement groove on the screw head. The pressure block is installed on the second spring and is slidably connected to the screw head on the same axis. The upper surface of the pressure block is provided with a cross groove. A hinge seat is symmetrically fixedly installed on the outer arc surface of the pressure block near the top, and a connection hole is opened on the lower part of the outer arc surface of the pressure block corresponding to the hinge seat. The two opposite sides of the top of the screw head are inclined.

[0012] Preferably, the fixing mechanism further includes a gripper and a spring. The spring is connected to the connecting hole on the pressure block, and the gripper is hinged to the hinge seat on the pressure block. The other end of the spring is fixedly connected to the side wall of the gripper. The bend of the gripper is located above the pressure block, and the sidewall of the gripper corresponds to the inclined portion of the screw head.

[0013] Preferably, a snap-fit ​​groove is formed on the outer circular surface of the boss, and a snap-fit ​​rubber block is fixedly installed on the inner arc surface of the sealing ring. The sealing ring and the boss are coaxially and movably connected, and the snap-fit ​​groove on the boss corresponds to the snap-fit ​​rubber block on the sealing ring.

[0014] Compared with the prior art, this utility model provides a screw with reinforcing teeth, which has the following beneficial effects: 1. This screw with reinforced teeth achieves a progressive locking effect through its segmented reinforced tooth structure. The spiked teeth pre-cut the material to reduce resistance when screwed in, the barbed teeth prevent reverse withdrawal, and the wide flat saw teeth disperse stress through the trapezoidal cross section and V-groove. Compared with traditional single-thread screws, its vibration and loosening resistance is significantly improved, making it especially suitable for high dynamic load environments.

[0015] 2. The screw with reinforced teeth, drill bit and diameter-gradient shank assembly combine to enable the screw to perform both self-tapping drilling and thread forming functions, allowing for direct installation without pre-drilling. At the same time, the rounded transition at the shank connection reduces the risk of stress concentration.

[0016] 3. The screw with reinforced teeth has a fixing mechanism at the screw head. When tightening force is applied through the cross groove, the pressure block is pressed and the jaws open outward under the action of the inclined side of the screw head and tightly abut against the assembly surface. Combined with the elastic restoring force of the spring, a double fixing is formed, which significantly enhances the screw's anti-loosening ability in a vibration environment. The snap-fit ​​structure between the boss and the sealing ring gives the screw better waterproof ability. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is an exploded view of the present invention; Figure 3 This is a cross-sectional view of the present invention; Figure 4 for Figure 1 A magnified view of part A in the diagram.

[0018] In the diagram: 1. Pressure block; 2. Cross groove; 3. Clamping jaw; 4. Spring 1; 5. Screw head; 6. Sealing ring; 7. Rear end rod; 8. Middle section rod; 9. Front end rod; 10. Spiked tooth; 11. Barbed tooth; 12. Wide flat saw tooth; 13. V-groove; 14. Drill bit; 15. Spring 2; 16. Boss. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figure 1-4 A screw with reinforcing teeth includes a screw head 5, a rear end shank 7, a middle section shank 8, a front end shank 9, a drill bit 14, and a boss 16. The bottom surface of the screw head 5 is coaxially fixedly mounted with the boss 16. The bottom surface of the boss 16 is coaxially fixedly mounted with the rear end shank 7. The bottom surface of the rear end shank 7 is coaxially fixedly mounted with the middle section shank 8. The bottom surface of the middle section shank 8 is coaxially fixedly mounted with the front end shank 9. The bottom surface of the front end shank 9 is connected to the drill bit 14. The rear end rod 7, the middle section rod 8, and the front end rod 9 together constitute the rod assembly, which is equipped with a reinforcing tooth structure. The upper surface of the screw head 5 is provided with a placement groove, and a fixing mechanism is provided in the placement groove.

[0021] Furthermore, the reinforced tooth structure includes spiked teeth 10, which are mounted on the circumference of the front end rod 9, with the tips of the spiked teeth 10 facing the drill bit 14.

[0022] Furthermore, the reinforcing tooth structure also includes barbed teeth 11. The middle section rod 8 is circumferentially equipped with barbed teeth 11, with the tips of the barbed teeth 11 facing the screw head 5. The tips of the barbed teeth 11 can smoothly cut into the material when the screw is screwed in, and can also form a strong mechanical barrier when subjected to reverse force.

[0023] Furthermore, the reinforcing tooth structure also includes wide flat saw teeth 12 and V-grooves 13. Wide flat saw teeth 12 are installed on the circumference of the rear end rod 7. The cross-section of the wide flat saw teeth 12 is trapezoidal. V-grooves 13 are opened between two adjacent wide flat saw teeth 12 on the circumference of the rear end rod 7. The trapezoidal cross-section of the wide flat saw teeth 12 makes the contact area between the tooth tip and the material larger, which can transmit the axial load more evenly to the connected parts and reduce material damage caused by excessive local pressure. The V-grooves 13 can not only accommodate debris, but its two side walls can also form lateral friction with the material to help enhance the anti-loosening effect. At the same time, it provides storage space for sealing material. When the sealing material is filled in, it can further improve the sealing performance of the screw and form a double sealing guarantee with the sealing ring 6.

[0024] Furthermore, the diameters of the rear end rod 7, the middle section rod 8, and the front end rod 9 gradually increase, and the connection points are smooth arc transitions; The pitch of the spiked teeth 10, barbed teeth 11, and wide flat saw teeth 12 gradually decreases, and the diameter of the rear end rod 7, the middle section rod 8, and the front end rod 9 gradually changes. This design allows the radial expansion force on the material to gradually increase during screw insertion. Combined with the reinforcing teeth with gradually decreasing pitch, it avoids material cracking caused by excessive instantaneous force. The smooth arc transition at the connection eliminates stress concentration points, allowing the rod assembly to distribute stress more evenly when subjected to combined loads such as tension and shear, thus extending the service life of the screw.

[0025] Furthermore, the fixing mechanism includes a pressure block 1, a cross groove 2, and a second spring 15. The second spring 15 is symmetrically fixedly installed on the bottom of the placement groove on the screw head 5. The pressure block 1 is installed on the second spring 15, and the pressure block 1 and the screw head 5 are coaxially slidably connected. The upper surface of the pressure block 1 is provided with a cross groove 2. A hinge seat is symmetrically fixedly installed on the outer arc surface of the pressure block 1 near the top, and a connection hole is opened on the lower part of the outer arc surface of the pressure block 1 corresponding to the hinge seat. The two opposite sides of the top of the screw head 5 are inclined; The sidewall of the jaw 3 corresponds to the inclined portion of the screw head 5.

[0026] Furthermore, the fixing mechanism includes a pressure block 1, a cross groove 2, and a second spring 15. The second spring 15 is symmetrically fixedly installed on the bottom of the placement groove on the screw head 5. The pressure block 1 is installed on the second spring 15, and the pressure block 1 and the screw head 5 are coaxially slidably connected. The upper surface of the pressure block 1 is provided with a cross groove 2. A hinge seat is symmetrically fixedly installed on the outer arc surface of the pressure block 1 near the top, and a connection hole is opened on the lower part of the outer arc surface of the pressure block 1 corresponding to the hinge seat. The two opposite sides of the top of the screw head 5 are inclined.

[0027] Furthermore, the fixing mechanism also includes a gripper 3 and a spring 4. The spring 4 is connected to the connecting hole on the pressure block 1, and the gripper 3 is hinged to the hinge seat on the pressure block 1. The other end of the spring 4 is fixedly connected to the side wall of the gripper 3. The bend of the jaw 3 is located above the pressure block 1, and the side wall of the jaw 3 corresponds to the inclined part of the screw head 5.

[0028] Furthermore, a snap-fit ​​groove is provided on the outer circular surface of the boss 16, and a snap-fit ​​rubber block is fixedly installed on the inner arc surface of the sealing ring 6. The sealing ring 6 and the boss 16 are coaxially and movably connected, and the snap-fit ​​groove on the boss 16 corresponds to the snap-fit ​​rubber block on the sealing ring 6.

[0029] Structural Description: Pressure Block 1: The pressure block is the core moving component of the fixing mechanism. It is cylindrical and slidably connected to the screw head 5 on the same axis. The upper surface has a cross groove 2, and the outer arc surface has a hinge seat and a connecting hole. The lower part is connected to Spring 2 15. When compressed, it moves axially, driving the gripper 3 to open. The spring 2 15 restores the elastic clamping force, which is the key to transmitting the tightening force and driving the gripper 3. It works in conjunction with the tilted side of the screw head 5 to complete the double fixing. Cross groove 2: Cross groove 2 is a force input structure, which is opened on the upper surface of pressure block 1 in a cross shape. It is compatible with conventional Phillips screwdrivers, provides a force point for tightening, and drives pressure block 1 to move down when transmitting torque, triggering the action of the fixing mechanism. It not only ensures the versatility of the tool, but also serves as the starting medium for the fixing mechanism. Gripper 3: Gripper 3 is an anti-loosening locking component. It is symmetrically hinged to the top hinge seat of the pressure block 1. The side wall is connected to spring 4. The bend is located above the pressure block 1. The inner side is opposite to the inclined side of the screw head 5. When pressed, it rotates around the hinge point, opens and abuts against the assembly surface. Spring 4 provides a restoring force to enhance the clamping force and form a mechanical lock. It works with spring 15 to form a double anti-loosening mechanism and improve the stability of the vibration environment. Spring 4: Spring 4 is an elastic reset component, connected between the connecting hole of the pressure block 1 and the side wall of the gripper 3. It is in a stretched state. When the gripper 3 opens, it stores elastic potential energy. When released, it pulls the gripper 3 to reset and tighten, ensuring that the gripper 3 fits tightly with the assembly surface, supplementing the clamping force. It is an elastic element that enhances the locking effect of the gripper 3 and ensures that the fixing mechanism is continuously locked. Screw head 5: Screw head 5 is the operating and load-bearing foundation of the screw. It has a slot on the top and a coaxial fixed boss 16 on the bottom. The two opposite sides of the top are inclined to accommodate the fixing mechanism and provide movement space for the pressure block 1 and the claw 3. The inclined sides guide the claw 3 to open. It connects to the rod assembly through the boss 16 and bears the axial load. It is the core carrier that integrates operation, fixing and connection functions. Sealing ring 6: Sealing ring 6 is a sealing component. It is annular with a snap-fit ​​rubber block on the inner arc surface. It is coaxially and movably connected with the boss 16. It is fixed by the snap-fit ​​rubber block and the snap-fit ​​groove of the boss 16. When the screw is tightened, it is squeezed by the boss 16 and the assembly surface, filling the gap to form a sealing barrier, preventing water and dust from entering. It is a key structure to improve the waterproof and dustproof performance of the screw. Rear end rod 7: The rear end rod 7 is the load-bearing section of the rod assembly. It has the largest diameter and is coaxially connected to the boss 16 and the middle rod 8. It has wide flat sawtooth 12 and V-shaped groove 13 distributed around its circumference. The connection with the middle rod 8 is a rounded transition. The trapezoidal cross section of the wide flat sawtooth 12 enhances the interlocking force, and the V-shaped groove 13 assists in sealing and stress dispersion. It bears the main load and is the core rod section that improves the connection strength and sealing performance. Middle section rod 8: The middle section rod 8 is the transition connection section of the rod assembly. Its diameter is between the front end rod 9 and the rear end rod 7. It coaxially connects the rear end rod 7 and the front end rod 9. It is equipped with barbed teeth 11 around its circumference. Both ends are transitioned to other rod sections by arcs. The barbed teeth 11 face the screw head 5 to form a reverse locking, preventing the screw from coming out. At the same time, it disperses the stress of the rod. It is a key transition structure that connects the front and rear rod sections and realizes the anti-loosening function. Front end rod 9: The front end rod 9 is the cutting section of the rod assembly. It has the smallest diameter and coaxially connects the middle rod 8 and the drill bit 14. It has circumferentially distributed spiked teeth 10 with the tips of the teeth facing the drill bit 14. It works with the drill bit 14 to cut into the material first. The spiked teeth 10 pre-cut the material to reduce resistance and guide the subsequent rod sections. It is a preliminary structure that reduces the difficulty of screwing in and guides the screw to be screwed in. It is suitable for the initial cutting of various materials. Spike 10: Spike 10 is a front-end cutting component, distributed around the circumference of the front-end rod 9. The tooth tips face the drill bit 14 and the tooth pitch is relatively large. When screwing in, it contacts the material first. Through the pre-cutting of the sharp tooth tips, the initial screwing resistance is reduced, which helps the front-end rod 9 to cut in quickly and lays the foundation for the subsequent rod segment engagement. It is a pre-cutting structure that improves the screw assembly efficiency. Barbed teeth 11: Barbed teeth 11 are the middle section anti-loosening components, distributed around the circumference of the middle section rod 8. The tooth tips face the screw head 5, and the tooth pitch is moderate. After the screw is screwed in, the tooth tips embed into the material to form a reverse mechanical lock, preventing the screw from coming out due to vibration or reverse force. Together with the front spike teeth 10 and the rear wide flat saw teeth 12, they form a progressive anti-loosening system to enhance the anti-loosening ability. Wide flat saw teeth 12: Wide flat saw teeth 12 are the rear locking components, distributed around the circumference of the rear rod 7. The cross-section is trapezoidal with the smallest tooth pitch. The wide tooth surface increases the contact area with the material. The trapezoidal structure disperses axial stress, improves biting force and load-bearing capacity. Combined with the V-groove 13, it enhances the seal and is the core tooth structure that bears the main locking force and ensures the connection strength. V-groove 13: V-groove 13 is an auxiliary structure, which is opened between the adjacent wide flat serrations 12 of the rear end rod 7. It can accommodate material debris and prevent debris from accumulating and hindering assembly when screwing in. Drill bit 14: Drill bit 14 is a self-tapping drilling component connected to the bottom of the front rod 9. It is tapered with a sharp tip, and it is the first to contact the material and drill a hole, opening a path for the front rod 9 and the spike teeth 10. This allows the screw to be installed directly without pre-drilling, simplifying the assembly process and improving installation efficiency. It is the key cutting component for realizing the self-tapping function. Spring 2 15: Spring 2 15 is an elastic support component, symmetrically fixed at the bottom of the slot of the screw head 5, and connected to the pressure block 1 at the top. In its natural state, it supports the pressure block 1. When compressed, it contracts to store potential energy. When released, it pushes the pressure block 1 to reset, providing the pressure block 1 with a continuous upward elastic force. Together with Spring 1 4, it enhances the locking effect of the fixing mechanism and is the core component to ensure elastic clamping. Boss 16: Boss 16 is a transitional component for connection and sealing. It is coaxially fixed between the bottom surface of the screw head 5 and the rear rod 7. The outer surface has a snap-fit ​​groove to connect the screw head 5 and the rear rod 7, transmit axial load, limit the screw insertion depth, and install the sealing ring 6 through the snap-fit ​​groove to provide a basis for sealing. At the same time, it disperses the stress between the screw head 5 and the rod. It is a transitional structure that integrates connection, limiting and sealing functions.

[0030] Working principle: When a Phillips screwdriver is inserted into the Phillips groove 2 of the pressure block 1 to apply torque, the pressure block 1 is pressed and overcomes the elastic force of the second spring 15 to slide downward along the axial direction of the screw head 5. The hinge seat on its outer arc surface drives the jaw 3 to move downward synchronously. After the side wall of the jaw 3 contacts the inclined side of the screw head 5, it rotates outward along the hinge point and opens. At this time, the first spring 4 is stretched and stores elastic potential energy. The bent part of the jaw 3 abuts against the assembly surface to form a mechanical lock. Combined with the restoring force of the second spring 15, a double fixation is achieved, which significantly improves the anti-loosening effect in vibration environment.

[0031] Meanwhile, the drill bit 14 at the bottom of the front rod 9 first contacts the material and drills a hole. The spiked teeth 10 on the circumference of the front rod 9 are screwed into the pre-cut material as the screw is screwed in, reducing the initial screwing resistance and guiding the screw to cut axially. As the screwing depth increases, the barbed teeth 11 of the middle rod 8, with their tips facing the screw head 5, gradually embed into the material to form a reverse lock, preventing the screw from coming out due to vibration or reverse force. The wide flat saw teeth 12 of the rear rod 7, with their trapezoidal cross section, engage with the material over a large area, dispersing axial stress. The V-shaped grooves 13 between adjacent saw teeth accommodate material debris. Together with the rod assembly of the rear rod 7, middle rod 8, and front rod 9, which have gradually changing diameters and rounded transitions, the risk of stress concentration is reduced and the overall load-bearing capacity is improved.

[0032] When the screw is screwed into the preset depth, the boss 16 fits against the assembly surface. The sealing ring 6 on its outer circular surface is fixed by the snap-fit ​​rubber block and the snap-fit ​​groove of the boss 16. After being squeezed, it fills the gap and forms a sealing barrier to achieve waterproof and dustproof. At this time, the pressure block 1 maintains the pressure on the clamp 3 under the action of the second spring 15. The first spring 4 pulls the clamp 3 to continue to fit against the assembly surface. The screw head 5 transmits the axial load to the rod assembly through the boss 16, so that each reinforcing tooth is tightly engaged with the material.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A screw with reinforcing teeth, characterized in that, include: The screw head (5), rear end rod (7), middle section rod (8), front end rod (9), drill bit (14) and boss (16) are coaxially fixedly mounted on the bottom surface of the screw head (5). The rear end rod (7) is coaxially fixedly mounted on the bottom surface of the boss (16). The middle section rod (8) is coaxially fixedly mounted on the bottom surface of the rear end rod (7). The front end rod (9) is coaxially fixedly mounted on the bottom surface of the middle section rod (8). The drill bit (14) is connected to the bottom surface of the front end rod (9). The rear end rod (7), the middle section rod (8) and the front end rod (9) together constitute a rod assembly, and the rod assembly is provided with a reinforcing tooth structure; The upper surface of the screw head (5) is provided with a placement groove, and a fixing mechanism is provided in the placement groove.

2. A screw with reinforcing teeth according to claim 1, characterized in that, The reinforced tooth structure includes spiked teeth (10), and the front end rod (9) is circumferentially equipped with spiked teeth (10), with the tips of the spiked teeth (10) facing the drill bit (14).

3. A screw with reinforcing teeth according to claim 2, characterized in that, The reinforcing tooth structure also includes barbed teeth (11), and the middle section rod (8) is circumferentially equipped with barbed teeth (11), with the tips of the barbed teeth (11) facing the screw head (5).

4. A screw with reinforcing teeth according to claim 3, characterized in that, The reinforcing tooth structure also includes wide flat saw teeth (12) and V-shaped grooves (13). Wide flat saw teeth (12) are installed on the circumference of the rear end rod (7). The cross section of the wide flat saw teeth (12) is trapezoidal. V-shaped grooves (13) are opened between two adjacent wide flat saw teeth (12) on the circumference of the rear end rod (7).

5. A screw with reinforcing teeth according to claim 4, characterized in that, The diameters of the rear end rod (7), the middle section rod (8), and the front end rod (9) gradually increase, and the connection is a smooth arc transition; The pitch of the spiked teeth (10), the barbed teeth (11), and the wide flat saw teeth (12) gradually decreases.

6. A screw with reinforcing teeth according to claim 1, characterized in that, The fixing mechanism includes a pressure block (1), a cross groove (2) and a second spring (15). The second spring (15) is symmetrically fixedly installed on the bottom of the placement groove on the screw head (5). The pressure block (1) is installed on the second spring (15), and the pressure block (1) and the screw head (5) are coaxially slidably connected. The upper surface of the pressure block (1) is provided with a cross groove (2). The outer arc surface of the pressure block (1) is symmetrically fixed with a hinge seat near the top, and a connection hole is opened on the lower part of the outer arc surface of the pressure block (1) corresponding to the hinge seat. The two opposite sides of the top of the screw head (5) are inclined.

7. A screw with reinforcing teeth according to claim 6, characterized in that, The fixing mechanism also includes a gripper (3) and a spring (4). The spring (4) is connected in the connecting hole on the pressure block (1), and the gripper (3) is hinged in the hinge seat on the pressure block (1). The other end of the spring (4) is fixedly connected to the side wall of the gripper (3). The bent part of the jaw (3) is located above the pressure block (1), and the side wall of the jaw (3) and the inclined part of the screw head (5) are opposite to each other.

8. A screw with reinforcing teeth according to claim 1, characterized in that, The outer circular surface of the boss (16) is provided with a snap-fit ​​groove, and a snap-fit ​​rubber block is fixedly installed on the inner circular arc surface of the sealing ring (6). The sealing ring (6) and the boss (16) are coaxially and movably connected, and the snap-fit ​​groove on the boss (16) corresponds to the snap-fit ​​rubber block on the sealing ring (6).

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