Screw with high drawing resistance

Abstract

The invention discloses a screw with high drawing resistance, which comprises a screw rod, a head part is arranged above the screw rod, and a cross groove is formed in the top of the head part; a connecting rod is welded to the bottom of the head, reinforcing ribs are fixed to the connecting position of the head and the connecting rod at equal angles, a mounting hole is formed in the top of the screw, an annular groove is formed in the outer side of the upper end of the screw, a limiting ring is arranged on the inner wall of the annular groove, and containing grooves are formed in the left side and the right side of the lower end of the connecting rod. According to the screw with the high anti-drawing capacity, through the arrangement of the annular groove, the limiting ring and the reinforcing ribs, the connection stability can be enhanced, stress is prevented from being concentrated in a certain local area, the anti-drawing capacity and the anti-loosening performance of the screw are improved, meanwhile, the dismounting difficulty of the screw cannot be increased, and the split type structural design is adopted, so that when the head is damaged, the screw is prevented from being damaged. Therefore, the whole screw does not need to be dismantled, maintenance time and workload are greatly saved, and maintenance cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of screws, and specifically to a screw with strong anti-pulling ability. Background Art

[0002] A screw is a common fastener, usually consisting of a head and a threaded rod, mainly used to connect two or more components together, and through the pre-tightening force generated by tightening, keep the components closely combined to withstand certain loads such as tensile force, pressure, and shear force; it has a wide range of applications in many fields such as mechanical manufacturing, construction, and electronic equipment; Defect 1: For areas affected by strong winds and the like, the screw is prone to a large pulling force, and is easily pulled out due to excessive pulling force, resulting in failure, and the use is not safe enough; to solve the above defect, the prior art (Chinese patent with application number: 202221589766.4, authorization publication date: October 18, 2022) discloses an anti-pulling screw. By setting the thread on the screw body so that the angle between the side close to the screw head and the screw rod is an acute angle, the thread is in an umbrella shape, and the screw body has good anti-pulling performance and is not easy to loosen; the limit plate cooperates with the anti-rotation strip to make the screw body not easy to loosen during use; Defect 2: After the nut is removed, the fixing groove on the screw makes the surface of the screw uneven. At the same time, for the connection part between the segmented screws, only a small clamping block is used for connection and fixation, and the connection strength is low; to solve Defect 2, the prior art (Chinese patent with application number: 202122118892.3, authorization publication date: January 25, 2022) discloses a split screw. By setting a spring-back component, it is realized that the moving plate can spring back to the top of the screw body after the nut is taken out, thereby improving the flatness of the screw, avoiding the fixing groove inside the screw body from making the surface of the screw body uneven, and thus making the object uneven. Through this structure, the overall aesthetics is improved after fixing the object; by setting a clamping component, it is realized that the connection screw can be conveniently fixed, improving the firmness of the connection screw fixation. At the same time, this structure is easy to operate, only need to insert the limit plate into the screw body, which is convenient for the operator to use, thereby improving the convenience of use and saving working time.

[0003] The prior art is to set an umbrella-shaped thread on the screw body to make it have good anti-pulling performance. However, due to the relatively tight bite between the thread and the connected part and the special shape, a larger torque is required to screw out the screw, which is easy to cause damage to the screw head or thread slipping, increasing the difficulty of disassembly. And after the screw head is damaged, usually the whole screw needs to be removed, but this requires special tools and even damage to the surrounding structure to take out, increasing the difficulty and cost of maintenance and prolonging the maintenance time. Therefore, we propose a screw with strong anti-pulling ability to solve the problems raised above. Summary of the Invention

[0004] The object of the present invention is to provide a screw with strong anti-pulling ability, so as to solve the problems raised in the above background technology. Since the engagement between the screw teeth and the connected parts is relatively tight and the shape is special, a larger torque is required to screw out the screw, which easily causes damage to the screw head or thread slipping, increasing the difficulty of disassembly. And after the screw head is damaged, usually the whole screw needs to be removed, but this requires special tools and even damage to the surrounding structure to take out, increasing the difficulty and cost of maintenance and prolonging the maintenance time.

[0005] To achieve the above object, the present invention provides the following technical solution: A screw with strong anti-pulling ability, including a screw rod, a head is arranged above the screw rod, and a cross slot is opened at the top of the head;

[0006] A connecting rod is welded to the bottom of the head, and reinforcing ribs are fixedly arranged at equal angles at the connection position between the head and the connecting rod. An installation hole is opened at the top of the screw rod. An annular groove is opened on the outer side of the upper end of the screw rod, and a limiting ring is arranged on the inner wall of the annular groove. Accommodation grooves are opened on the left and right sides of the lower end of the connecting rod, and positioning blocks are connected inside the accommodation grooves. A first spring is installed between one end of the positioning block and the inner wall of the accommodation groove. Positioning holes are opened on the outer side of the screw rod below the annular groove, and driving blocks are connected inside the positioning holes. A second spring is installed between the outer side of the driving block and the inner wall of the positioning hole.

[0007] Preferably, internal threads are provided on the inner wall of the installation hole, external threads adapted to the internal threads are provided on the outer wall of the connecting rod, and the connecting rod is threadedly connected with the installation hole.

[0008] Preferably, the positions of the positioning blocks and the positioning holes correspond one by one, and the positioning blocks are inserted into the positioning holes. The positioning blocks are slidably arranged inside the accommodation grooves. The opposite ends of the two driving blocks both extend out of the outer surface of the screw rod, and the driving blocks are slidably arranged inside the positioning holes.

[0009] Preferably, the end parts of the driving blocks and the positioning blocks are in contact with each other. Ball bearings are embedded at the opposite ends of the two driving blocks, and the ball bearings are rotatably connected with the driving blocks.

[0010] Preferably, a guiding part is arranged at the bottom of the screw rod, the reinforcing ribs are arranged in a triangular shape, and the limiting ring is made of a shape memory metal material.

[0011] Preferably, a magnet is fixed at the bottom of the inner wall of the cross slot, and the magnet can help the screwdriver to accurately align with the cross slot.

[0012] Preferably, a sealing washer is fixedly connected to the bottom of the head, a groove is formed in the bottom of the sealing washer, and a material storage airbag is adhesively bonded inside the groove. The inner side of the material storage airbag is provided with a discharge pipe at equal angles, and a movable ring is connected below the sealing washer.

[0013] Preferably, anaerobic glue is stored inside the material storage airbag. One end of the discharge pipe away from the material storage airbag extends out of the inner side of the sealing washer. A feeding port is formed in the top of the material storage airbag, and a sealing cover is screwed to the inner wall of the feeding port with anaerobic glue for sealing.

[0014] Preferably, connecting rods are welded to the outer side of the movable ring at equal angles. One end of the connecting rod away from the movable ring is slidably arranged inside the sealing washer, and the connecting rod is arranged in an inverted "L" shape.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: For the screw with strong anti-pulling ability, through the arranged annular groove, limiting ring and reinforcing rib, the connection stability can be enhanced, stress concentration in a certain local area can be avoided, the anti-pulling ability and anti-loosening performance of the screw can be improved, and at the same time, the difficulty of disassembling the screw will not be increased. Moreover, with the split structure design, when the head is damaged, it can be replaced, so that the whole screw does not need to be removed, greatly saving the maintenance time and workload and reducing the maintenance cost. The specific content is as follows:

[0016] (1) Heat the limiting ring to make it soft, and then install the screw on the connecting piece, so that the limiting ring will be squeezed and deformed and closely fit on the contact surface between the screw and the connected piece. After the installation is completed, when the temperature returns to the normal working temperature, the limiting ring can generate uniform radial pressure at the connection part, which helps to compensate for connection looseness caused by factors such as vibration and temperature change, make the fit between the screw and the connected piece closer, thereby enhancing the connection stability and improving the anti-pulling ability and anti-loosening performance of the screw; Further, a reinforcing rib is arranged at the connection between the head and the connecting rod, which can avoid stress concentration in a certain local area, thereby improving the overall anti-pulling performance of the screw.

[0017] (2) When the head is damaged, by pressing the two driving blocks, the two driving blocks move relative to each other, squeezing the positioning blocks, and then causing the two positioning blocks to move relative to each other and separate from the positioning holes, releasing the limit on the connecting rod. Then, rotate the head in the reverse direction so that the connecting rod screws out of the mounting hole, thereby facilitating the quick removal of the head from the screw and installing a new head on the screw. Thus, only the damaged head needs to be replaced without removing the entire screw, greatly saving the maintenance time and workload and reducing the maintenance cost. Further, screw the connecting rod on the new head into the mounting hole on the screw. As the connecting rod extends, the positioning block is exactly at the position of the positioning groove. Then, under the elastic force of the first spring, drive the positioning block to insert into the positioning groove, which can limit the connecting rod, thereby ensuring the firm connection between the head and the screw.

[0018] (3) Utilize the balls provided at the ends of the driving blocks, so that during the tightening process of the screw, the balls can roll between the threads or on the contact surface of the connected part, playing the role of fine-tuning the position and evenly distributing the pressure. Thus, it helps to make the fit between the screw and the connected part closer and smoother, reducing looseness or deformation caused by uneven local pressure, thereby improving the stability and reliability of the connection.

[0019] (4) When the screw is installed into the connected part, the movable ring will come into contact with the connected part and move under extrusion, which can squeeze the material storage airbag, causing the material storage airbag to be compressed and release gas, and extrude the anaerobic adhesive inside through the discharge pipe. A cured film can be formed on the surface of the screw, filling the thread gaps, increasing the friction force, and at the same time, it can also play the role of sealing and anti-corrosion, thereby achieving a reliable anti-loosening effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic three-dimensional structure diagram of the whole invention;

[0021] Figure 2 is a schematic separation structure diagram of the head and the screw of the invention;

[0022] Figure 3 is a schematic connection structure diagram of the movable ring and the sealing washer of the invention;

[0023] Figure 4 is a schematic three-dimensional structure diagram of the reinforcing rib, the head and the connecting rod of the invention;

[0024] Figure 5 is a schematic connection structure diagram of the connecting rod and the screw of the invention;

[0025] Figure 6 is a schematic separation structure diagram of the magnet and the cross slot of the invention;

[0026] Figure 7 is a schematic connection structure diagram of the material storage airbag and the feed pipe of the invention;

[0027] Figure 8 For the present invention Figure 5 is a schematic enlarged view of the structure at position A in the present invention.

[0028] In the figure: 1, screw rod; 2, guiding part; 3, head; 4, cross slot; 5, connecting rod; 6, reinforcing rib; 7, magnet; 8, mounting hole; 9, sealing washer; 10, storage airbag; 11, movable ring; 12, connecting rod; 13, sealing cover; 14, discharge pipe; 15, annular groove; 16, limiting ring; 17, positioning block; 18, accommodating groove; 19, first spring; 20, driving block; 21, ball; 22, second spring. Specific embodiments

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0030] Please refer to Figures 1-8 , the present invention provides the following technical solution: a screw with strong anti-pulling ability;

[0031] Embodiment 1: To solve the problem in the prior art that since the engagement between the screw teeth and the connected part is relatively tight and the shape is special, a larger torque is required to screw out the screw, which easily causes damage to the head 3 of the screw or thread slipping, increasing the difficulty of disassembly. And after the head 3 of the screw is damaged, usually the entire screw needs to be removed, but this requires special tools and even damage to the surrounding structure to take out, increasing the difficulty and cost of maintenance and prolonging the maintenance time. Therefore, the following solution is disclosed. Specifically refer to Figures 1-4 and Figure 6 as shown, it includes a screw rod 1, a head 3 is arranged above the screw rod 1, and a cross slot 4 is opened at the top of the head 3. A magnet 7 is fixed at the bottom of the inner wall of the cross slot 4. The magnet 7 can help the screwdriver to more accurately align with the cross slot 4; reinforcing ribs 6 are fixed at equal angles at the connection position between the head 3 and the connecting rod 5. An annular groove 15 is opened on the outer side of the upper end of the screw rod 1, and a limiting ring 16 is arranged on the inner wall of the annular groove 15. A guiding part 2 is arranged at the bottom of the screw rod 1. The reinforcing ribs 6 are arranged in a triangular shape, and the limiting ring 16 is made of a shape memory metal material.

[0032] Before use, the user first heats the limit ring 16 to make it soft, and inserts the screw into the pre-drilled hole or the part to be connected. At the same time, the provided guiding part 2 can play a good guiding role during the screw installation. Then, the magnet 7 arranged inside the cross slot 4 can exert a certain attracting effect on the screwdriver, so as to help the screwdriver more accurately align with the cross slot 4. Especially in the case of insufficient light or limited operating space, it can improve the operation accuracy, reduce the damage to the cross slot 4 and the screw head 3. As the screw 1 is screwed in, the limit ring 16 will be squeezed and deformed, and closely fit on the contact surface between the screw and the connected part. After the installation is completed, the temperature returns to the normal working temperature. At this time, the shape memory metal begins to exert its unique performance and can return to the pre-set shape, so that the limit ring 16 can generate uniform radial pressure at the connection part, which helps to compensate for the connection looseness caused by factors such as vibration and temperature change, make the fit between the screw and the connected part closer, thereby enhancing the connection stability, improving the screw's anti-pulling and anti-loosening performance, and using the reinforcing rib 6 arranged at the connection between the head 3 and the connecting rod 5 can avoid stress concentration in a certain local area, thus improving the overall anti-pulling performance of the screw.

[0033] Embodiment 2: Different from Embodiment 1, in this embodiment, by using the provided reinforcing rib 6 and limit ring 16, the anti-pulling and anti-loosening performance of the screw can be improved. Specifically, refer to Figure 2 , Figure 5 and Figure 8 As shown, the connecting rod 5 is welded to the bottom of the head 3. An installation hole 8 is opened at the top of the screw 1. The inner wall of the installation hole 8 is provided with internal threads. The outer wall of the connecting rod 5 is provided with external threads adapted to the internal threads, and the connecting rod 5 and the installation hole 8 are in threaded connection. Accommodation grooves 18 are opened on the left and right sides at the lower end of the connecting rod 5, and positioning blocks 17 are connected inside the accommodation grooves 18. A first spring 19 is installed between one end of the positioning block 17 and the inner wall of the accommodation groove 18. Positioning holes are opened on the outer side of the screw 1 below the annular groove 15, and driving blocks 20 are connected inside the positioning holes. A second spring 22 is installed between the outer side of the driving block 20 and the inner wall of the positioning hole. The positions of the positioning blocks 17 and the positioning holes correspond one by one, and the positioning blocks 17 and the positioning holes are in insertion connection. The positioning blocks 17 are slidably arranged inside the accommodation grooves 18. The opposite ends of the two driving blocks 20 both extend out of the outer surface of the screw 1, and the driving blocks 20 are slidably arranged inside the positioning holes. The opposite ends of the driving blocks 20 are in contact with the ends of the positioning blocks 17. Ball bearings 21 are embedded at the opposite ends of the two driving blocks 20, and the ball bearings 21 are in rolling connection with the driving blocks 20.

[0034] When the head 3 is damaged, the user can manually press the two driving blocks 20 (the second spring 22 is in a compressed state), causing the two driving blocks 20 to move relative to each other, squeezing the positioning blocks 17, and then causing the two positioning blocks 17 to move relative to each other (the first spring 19 is in a compressed state) and separate from the positioning holes, releasing the limit on the connecting rod 5. Then, the head 3 can be rotated reversely, driving the connecting rod 5 to rotate reversely, so that the connecting rod 5 is screwed out of the mounting hole 8, facilitating the quick removal of the head 3 from the screw 1. After that, the user screws the connecting rod 5 on the new head 3 into the mounting hole 8 on the screw 1. As the connecting rod 5 extends, the positioning block 17 is exactly in the position of the positioning groove. Then, under the elastic force of the first spring 19, the positioning block 17 is driven to insert into the positioning groove, which can limit the connecting rod 5 and ensure the firm connection between the head 3 and the screw 1. Thus, only the damaged head 3 needs to be replaced, without removing the entire screw, greatly saving the maintenance time and workload, reducing the maintenance cost. After the head 3 is replaced, the driving block 20 resets under the elastic force of the second spring 22, and the ball 21 provided at the end of the driving block 20 enables the ball 21 to roll between the threads or on the contact surface of the connected part during the screwing process of the screw, playing a role in fine-tuning the position and evenly distributing the pressure. This helps to make the fit between the screw and the connected part closer and smoother, reducing looseness or deformation caused by uneven local pressure, thereby improving the stability and reliability of the connection.

[0035] Embodiment 3: Different from Embodiment 2, the anaerobic adhesive extruded by the storage airbag 10 in this embodiment can form a cured film on the surface of the screw 1, filling the thread gaps and increasing the friction force. Specifically, refer to Figure 1 , Figure 3 and Figure 7 As shown, a sealing washer 9 is fixedly connected to the bottom of the head 3, and a groove is formed in the bottom of the sealing washer 9. An air storage bag 10 is adhesively bonded inside the groove. The inner side of the air storage bag 10 is provided with discharge pipes 14 at equal angles. A movable ring 11 is connected below the sealing washer 9. Anaerobic adhesive is stored inside the air storage bag 10. One end of the discharge pipe 14 away from the air storage bag 10 extends out of the inner side of the sealing washer 9. A feeding port is formed at the top of the air storage bag 10, and a sealing cover 13 is threadedly connected to the inner wall of the feeding port in an anaerobic adhesive sealing manner. Connecting rods 12 are welded to the outer side of the movable ring 11 at equal angles, and one end of the connecting rod 12 away from the movable ring 11 is slidably arranged inside the sealing washer 9. The connecting rod 12 is arranged in an inverted "L" shape.

[0036] When the screw is installed into the connecting piece, the movable ring 11 will come into contact with the connecting piece and move under extrusion, which can squeeze the material storage airbag 10, extrude the anaerobic adhesive inside through the discharge pipe 14, form a cured film on the surface of the screw 1, fill the thread gap, increase the friction force, and at the same time can also play a role in sealing and anti-corrosion, so as to achieve a reliable anti-loosening effect. Moreover, by using the provided sealing washer 9, the contact area between the screw head 3 and the connected part can be increased, so that the pressure distribution of the screw on the connected part is more uniform, avoiding damage to the surface of the connected part caused by pressure concentration. Subsequently, the sealing cover 13 can be unscrewed, and anaerobic adhesive can be replenished into the material storage airbag 10 through the feeding port, making it expand and return to its original state, while pushing the movable ring 11 to reset for the next use.

[0037] Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A screw with strong anti-pulling ability, comprising a screw rod (1), a head (3) is arranged above the screw rod (1), and a cross slot (4) is opened at the top of the head (3); characterized in that, A connecting rod (5) is welded to the bottom of the head (3), and reinforcing ribs (6) are fixedly arranged at equal angles at the connection position between the head (3) and the connecting rod (5). An installation hole (8) is formed at the top of the screw rod (1). An annular groove (15) is formed on the outer side of the upper end of the screw rod (1), and a limiting ring (16) is arranged on the inner wall of the annular groove (15). Accommodating grooves (18) are formed on the left and right sides at the lower end of the connecting rod (5), and positioning blocks (17) are connected inside the accommodating grooves (18). A first spring (19) is installed between one end of the positioning block (17) and the inner wall of the accommodating groove (18). Positioning holes are formed on the outer side of the screw rod (1) below the annular groove (15), and driving blocks (20) are connected inside the positioning holes. A second spring (22) is installed between the outer side of the driving block (20) and the inner wall of the positioning hole.

2. The screw with strong anti-pull-out ability according to claim 1, characterized in that: Internal threads are provided on the inner wall of the installation hole (8). External threads adapted to the internal threads are provided on the outer wall of the connecting rod (5), and the connecting rod (5) and the installation hole (8) are in threaded connection.

3. The screw with strong anti-pulling ability according to claim 1 is characterized in that: The positions of the positioning blocks (17) and the positioning holes correspond to each other one by one, and the positioning blocks (17) and the positioning holes are in plug-in connection. The positioning blocks (17) are slidably arranged inside the accommodating grooves (18). The opposite ends of the two driving blocks (20) both extend out of the outer surface of the screw rod (1), and the driving blocks (20) are slidably arranged inside the positioning holes.

4. A screw with strong anti-pulling ability according to claim 1, characterized in that: The driving blocks (20) are in contact with the ends of the positioning blocks (17). Ball bearings (21) are embedded and installed at the opposite ends of the two driving blocks (20), and the ball bearings (21) are in rolling connection with the driving blocks (20).

5. A screw with strong anti-pulling ability according to claim 1, characterized in that: A guiding portion (2) is arranged at the bottom of the screw rod (1). The reinforcing ribs (6) are arranged in a triangular shape. The limiting ring (16) is made of a shape memory metal material.

6. The screw with strong anti-pulling ability according to claim 1, characterized in that: A magnet (7) is fixed to the bottom of the inner wall of the cross slot (4), and the magnet (7) can help the screwdriver to more accurately align with the cross slot (4).

7. The screw with strong anti-pulling ability according to claim 1, characterized in that: A sealing washer (9) is fixedly connected to the bottom of the head (3). A groove is formed at the bottom of the sealing washer (9), and a storage airbag (10) is bonded inside the groove. Discharge pipes (14) are arranged at equal angles on the inner side surface of the storage airbag (10). An activity ring (11) is connected below the sealing washer (9).

8. The screw with strong anti-pulling ability according to claim 7, characterized in that: Anaerobic adhesive is stored inside the storage airbag (10). One end of the discharge pipe (14) far from the storage airbag (10) extends out of the inner side surface of the sealing washer (9). A feeding port is formed at the top of the storage airbag (10), and a sealing cover (13) is in anaerobic adhesive sealed threaded connection with the inner wall of the feeding port.

9. The screw with strong anti-pulling ability according to claim 7, characterized in that: Connecting rods (12) are welded at equal angles on the outer side surface of the activity ring (11). One end of the connecting rod (12) far from the activity ring (11) is slidably arranged inside the sealing washer (9), and the connecting rod (12) is arranged in an inverted "L" shape.

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