A wedge block assisted screw fastening anti-slip structure

Abstract

The utility model provides a wedge block auxiliary's screw fastening antiskid structure applied to screw antiskid field, including screw unit and nut unit, nut unit includes base, and the base top is fixed with limit stop and connecting sleeve, and the connecting sleeve outside has self -adaptation slide post, be equipped with wedge block and spline block on self -adaptation slide post, the limit stop top is equipped with spline groove, screw unit includes screw head and integrative formation in screw head bottom's screw post, and the connecting sleeve is internally provided with through -thread hole, the screw head bottom is fixed with buffer ring, and the buffer ring inboard wall is provided with the antiskid groove of adapting with wedge block, and the wedge block can be inserted into antiskid groove. The application passes through the one -way check structure of " wedge block + antiskid groove", and the pre -tightening force of combination tensioning spring, can effectively prevent screw reverse loosening, and the antiskid effect is superior to traditional spring washer, and dismouting is convenient, low in cost, is suitable for batch application in all kinds of fastening scene needing to resist vibration.

Description

Technical Field

[0001] This application relates to the field of screw anti-slip, and in particular to a screw fastening anti-slip structure assisted by a wedge block. Background Technology

[0002] Screws are the most commonly used fasteners in mechanical connections and are widely used in the assembly of components in various equipment. However, in scenarios where they are subjected to vibration and impact for a long time (such as automobile chassis and industrial motor housings), traditional screws are prone to loosening or even falling off due to reduced friction between the threaded parts caused by vibration, which can lead to equipment failure and safety hazards.

[0003] Existing solutions for loose screws mainly include: 1. Using spring washers, which increase the axial pressure of the threaded pair through the elastic deformation of the washer, thereby improving friction; however, spring washers are prone to metal fatigue after long-term use, and their anti-slip effect decreases significantly after the elasticity fails; 2. Using lock nuts (such as double nuts or nuts with adhesive), double nuts require two tightenings, which is cumbersome, and nuts with adhesive are expensive, and cannot be reused after disassembly due to adhesive failure; 3. Using non-removable structures such as pins or spot welding, which are reliable in preventing slippage, but cannot be disassembled for later maintenance, thus limiting their applicability.

[0004] In summary, existing anti-slip solutions suffer from drawbacks such as short anti-slip lifespan, complex operation, high cost, and non-reusability. There is an urgent need for a screw-fastening anti-slip structure that is simple in structure, reliable in anti-slip, easy to assemble and disassemble, and low in cost. Utility Model Content

[0005] The purpose of this application is to address the shortcomings of existing anti-slip solutions, such as "short anti-slip life, complex operation, high cost, and non-reusability". Compared with the existing technology, it provides a wedge-block assisted screw fastening anti-slip structure for fastening the upper and lower plates, including screw units and nut units. The nut unit includes a base, a limiting block and a connecting sleeve are fixed on the top of the base, and an adaptive sliding column is slidably connected to the outer side of the connecting sleeve; several wedge-shaped blocks are fixed at equal angles along the circumference on the top of the adaptive sliding column, and a spline block is integrally formed on the bottom of the adaptive sliding column; a spline groove adapted to the spline block is opened on the top of the limiting block, the spline block is embedded in the spline groove and can slide along the groove axis; a tension spring is provided between the adaptive sliding column and the limiting block, and the two ends of the tension spring are fixed to the bottom of the spline block and the bottom of the spline groove, respectively; The screw unit includes a screw head and a screw post integrally formed at the bottom of the screw head. The connecting sleeve has a through threaded hole adapted to the screw post, and the screw post is screwed into the through threaded hole. A buffer ring is fixed at the bottom of the screw head, and an anti-slip groove adapted to the wedge block is opened on the inner side wall of the buffer ring. The wedge block can be inserted into the anti-slip groove.

[0006] Furthermore, the upper plate has a through hole for the screw post to pass through, and the inner diameter of the through hole is adapted to the outer diameter of the screw post; the lower plate has a limiting hole adapted to the limiting block, the limiting block is embedded in the limiting hole, and the outer side wall of the limiting block is tightly fitted with the inner side wall of the limiting hole.

[0007] Furthermore, the horizontal cross-section of the wedge block is a right-angled triangle, with its right-angled side facing the axis of the adaptive sliding column and its hypotenuse facing away from the axis of the adaptive sliding column. Under the elastic force of the tension spring, the wedge block tends to move closer to and abut against the anti-slip groove, and the wedge block can prevent the screw unit from rotating in the direction away from the nut unit, i.e., the loosening direction, thus achieving one-way anti-reverse.

[0008] Furthermore, the tension spring is a cylindrical helical compression spring, which in its natural state has the elastic force to drive the adaptive sliding column to move upward along the spline groove axis and away from the limiting block.

[0009] Furthermore, the buffer ring is an elastic rubber ring made of nitrile rubber or silicone rubber; the buffer ring is sleeved on the outside of the screw post and sandwiched between the bottom of the screw head and the top of the upper plate.

[0010] Compared to existing technologies, the advantages of this application are: This application utilizes a one-way anti-reverse structure of "wedge block + anti-slip groove" combined with the preload of the tension spring to effectively prevent screws from loosening in the reverse direction. The anti-slip effect is superior to that of traditional spring washers, and there is no problem of metal fatigue failure. The elastic buffer ring can absorb vibration energy, reduce the impact of vibration on the threaded pair, reduce the cause of loosening from the root, and is easy to disassemble and assemble, low in cost, and suitable for mass application in various fastening scenarios that require vibration resistance. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure fixed to the upper and lower plates in this application; Figure 2 This is a schematic diagram of the exploded structure of this application; Figure 3 This is a schematic diagram of the adaptive sliding column proposed in this application; Figure 4 This is a schematic diagram of the bottom structure of the screw unit and nut unit proposed in this application; Figure 5 This is a cross-sectional structural diagram of this application; Figure 6 for Figure 5 A magnified structural diagram of part A in the middle.

[0012] Explanation of the labels in the diagram: 1. Screw unit; 11. Screw head; 12. Buffer ring; 13. Screw post; 14. Anti-slip groove; 2. Upper plate; 3. Lower plate; 31. Limiting hole; 4. Nut unit; 41. Base; 42. Limiting block; 421. Spline groove; 43. Adaptive sliding column; 431. Wedge block; 432. Spline block; 44. Tensioning spring; 45. Connecting sleeve. Detailed Implementation

[0013] The embodiments will be described clearly and completely with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments in this application without creative effort are within the scope of protection of this application.

[0014] Example: This utility model provides a wedge-block-assisted screw fastening anti-slip structure. Please refer to [link / reference]. Figures 1-6 Used to fasten the upper plate 2 and the lower plate 3, the core structure includes screw unit 1 and nut unit 4. Please refer to the following for details. Figure 4 The nut unit 4 serves as the fixed base for the anti-slip structure and includes a base 41, a limiting block 42, an adaptive sliding column 43, a tension spring 44, and a connecting sleeve 45.

[0015] The base 41 supports the entire nut unit. The limiting block 42 is a polygonal metal block integrally formed at the top center of the base 41. A spline groove 421 is provided on its top to limit the rotation of the adaptive sliding column 43, allowing it to slide only axially. The connecting sleeve 45 is a metal sleeve welded and fixed to the top of the base 41 and fitted inside the adaptive sliding column 43. Its outer wall is clearance-fitted with the inner wall of the adaptive sliding column 43 to achieve "limited sliding", that is, the adaptive sliding column can move axially along the connecting sleeve but cannot be radially offset. The adaptive sliding column 43 is a metal cylinder with several wedge-shaped blocks 431 fixed at equal angles along the circumference at the top. The spline block 432 at the bottom is adapted to the spline groove 421 of the limiting block to ensure that the adaptive sliding column can only move axially. The tension spring 44 is installed in the spline groove 421, with its two ends fixed to the bottom of the spline block 432 and the bottom of the spline groove 421, respectively. Under normal conditions, it provides an upward elastic force to push the adaptive sliding column 43 upward.

[0016] The screw unit 1 is used to fasten the upper plate 2 and the lower plate 3 in conjunction with the nut unit 4. It includes a screw head 11, a buffer ring 12 and a screw post 13. The screw head 11 has a hexagonal head structure, which is convenient for wrench to tighten. The screw post 13 is integrally formed at the bottom of the screw head 11 and has an external thread on its outer surface, which is adapted to the internal thread of the connecting sleeve 45 to achieve screw connection and fastening. The buffer ring 12 is an elastic rubber ring, which is bonded and fixed to the bottom of the screw head and sleeved on the outside of the screw post. Its inner side wall has an anti-slip groove 14 adapted to the wedge block 431. The inclination angle of the anti-slip groove is consistent with the inclination angle of the wedge block to ensure that the wedge block can be smoothly inserted.

[0017] Please refer to this first. Figure 5 The limiting hole 31 of the lower plate 3 is fitted onto the limiting block 42 to achieve the positioning of the nut 4 and the lower plate 3; the upper plate 2 is placed on top of the lower plate 3, and the screw post 13 passes through the through hole of the upper plate 2 and is screwed into the threaded hole of the connecting sleeve 45; when the screw head 11 is turned, the screw post 13 is gradually screwed in, the screw head 11 presses down on the buffer ring 12, the buffer ring 12 elastically deforms and presses the upper plate 2; at the same time, the anti-slip groove 14 of the buffer ring contacts the wedge block 431 at the top of the adaptive sliding column, and the tension spring 44 pushes the wedge block into the anti-slip groove 14 to form a "one-way locking" structure.

[0018] When screw unit 1 is turned clockwise, i.e. in the tightening direction, screw post 13 is screwed downward into the threaded hole of connecting sleeve 45, screw head 11 presses down on buffer ring 12, and anti-slip groove 14 of buffer ring 12 contacts the inclined side of wedge block 431; due to the guiding effect of the inclined side of wedge block 431, anti-slip groove 14 will exert downward pressure on wedge block 431, overcoming the elastic force of tension spring 44, causing adaptive sliding column 43 to slide downward, wedge block 431 smoothly slides along the inclined side through anti-slip groove 14, without obstructing screw tightening; until screw head 11 presses against buffer ring 12, upper plate 2 and lower plate 3 are tightly fitted, at this time wedge block 431 is locked into the nearest anti-slip groove under the action of spring elasticity, completing the tightening.

[0019] Anti-loosening process: When equipment vibration causes the screw to rotate counterclockwise, i.e., tend to loosen, the screw unit 1 will drive the buffer ring 12 to rotate counterclockwise synchronously. At this time, the side wall of the anti-slip groove 14 is in rigid contact with the right-angle side of the wedge block 431. The right-angle side of the wedge block 431 cannot slide along the anti-slip groove. The spline block and spline groove restrict the rotation of the adaptive sliding column, thereby preventing the screw from continuing to rotate counterclockwise and achieving "one-way anti-slip". At the same time, the elastic deformation of the buffer ring can absorb some vibration energy, reduce the impact of vibration on the threaded pair, and further reduce the risk of loosening.

[0020] This application utilizes a one-way anti-reverse structure of "wedge block + anti-slip groove" combined with the preload of the tension spring to effectively prevent screws from loosening in the reverse direction. The anti-slip effect is superior to that of traditional spring washers, and there is no problem of metal fatigue failure. The elastic buffer ring can absorb vibration energy, reduce the impact of vibration on the threaded pair, reduce the cause of loosening from the root, and is easy to disassemble and assemble, low in cost, and suitable for mass application in various fastening scenarios that require vibration resistance.

[0021] The above description is only the best implementation method adopted in this application in combination with current practical needs, but the scope of protection of this application is not limited thereto.

Claims

1. A wedge-block assisted screw fastening anti-slip structure for fastening an upper plate (2) and a lower plate (3), characterized in that, Includes screw unit (1) and nut unit (4); The nut unit (4) includes a base (41), a limiting block (42) and a connecting sleeve (45) are fixed on the top of the base (41), and an adaptive sliding column (43) is slidably connected to the outside of the connecting sleeve (45); a number of wedge blocks (431) are fixed at equal angles along the circumference on the top of the adaptive sliding column (43), and a spline block (432) is integrally formed on the bottom of the adaptive sliding column (43); a spline groove (421) adapted to the spline block (432) is opened on the top of the limiting block (42), and the spline block (432) is embedded in the spline groove (421) and can slide along the groove axis; a tension spring (44) is provided between the adaptive sliding column (43) and the limiting block (42), and the two ends of the tension spring (44) are fixed to the bottom of the spline block (432) and the bottom of the spline groove (421) respectively; The screw unit (1) includes a screw head (11) and a screw post (13) integrally formed at the bottom of the screw head (11). The connecting sleeve (45) has a through threaded hole adapted to the screw post (13), and the screw post (13) is screwed into the through threaded hole. A buffer ring (12) is fixed at the bottom of the screw head (11). The inner side wall of the buffer ring (12) has an anti-slip groove (14) adapted to the wedge block (431), and the wedge block (431) can be inserted into the anti-slip groove (14).

2. The wedge-block assisted screw fastening anti-slip structure according to claim 1, characterized in that, The upper plate (2) has a through hole for the screw post (13) to pass through, and the inner diameter of the through hole is adapted to the outer diameter of the screw post (13); the lower plate (3) has a limiting hole (31) adapted to the limiting block (42), the limiting block (42) is embedded in the limiting hole (31), and the outer side wall of the limiting block (42) is tightly fitted to the inner side wall of the limiting hole (31).

3. The wedge-block assisted screw fastening anti-slip structure according to claim 1, characterized in that, The horizontal cross-section of the wedge block (431) is a right triangle, with its right-angled side facing the axis of the adaptive sliding column (43) and its hypotenuse facing away from the axis of the adaptive sliding column (43). Under the elastic force of the tension spring (44), the wedge block (431) tends to move closer to and abut against the anti-slip groove (14), and the wedge block (431) can prevent the screw unit (1) from rotating in the direction away from the nut unit (4) (i.e., the loosening direction), thus achieving one-way anti-reverse.

4. The wedge-block assisted screw fastening anti-slip structure according to claim 1, characterized in that, The tension spring (44) is a cylindrical helical compression spring, which in its natural state has the elastic force to drive the adaptive slide (43) to move upward along the spline groove (421) away from the limit block (42).

5. The wedge-block assisted screw fastening anti-slip structure according to claim 1, characterized in that, The buffer ring (12) is an elastic rubber ring made of nitrile rubber or silicone rubber. The buffer ring (12) is sleeved on the outside of the screw post (13) and sandwiched between the bottom of the screw head (11) and the top of the upper plate (2).

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