High-strength fixed internal-screwing precision screw

Abstract

The utility model discloses a high-strength fixed internal screwing precision screw, which comprises a screw head, a screw rod, an internal screwing groove and a thread part, the bottom of the screw head is fixedly connected with a connecting rod, the bottom end of the connecting rod is fixedly connected with the top end of the screw rod, the outer wall of the connecting rod is sleeved with a self-adaptive locking assembly, and the screw rod is fixedly connected with the screw rod. By arranging the self-adaptive locking assembly, locking force can be automatically adjusted under different working conditions, pre-tightening force attenuation caused by vibration, impact or temperature changes is effectively counteracted, and compared with a passive anti-loosening mode of a traditional screw depending on friction force, the self-adaptive anti-loosening screw has the advantages that the anti-loosening effect is good, and the anti-loosening effect is good. The self-adaptive locking assembly can actively compensate the locking force, the loosening risk is remarkably reduced, the annular array blind holes are formed, the anti-disengaging assembly is embedded, a dual anti-disengaging mechanism is formed, the anti-disengaging assembly provides mechanical interlocking when bearing axial tension, the screw is prevented from being completely disengaged, and the connection safety is further improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to fastener technical field, concretely is a high strength fixed inner rotation precision screw. BACKGROUND

[0002] The inner rotation precision screw is a fastener that is tightened or loosened by the cooperation of internal threads and external tools, and its design emphasizes high precision, high strength and sealing performance. In the field of assembly, the screw as a basic fastener directly affects the reliability and service life of equipment connection. Traditional screws usually rely on the friction force of threads and connecting parts to achieve fixation, but under long-term vibration, impact or high load working conditions, the screw rod lacks an active locking mechanism.

[0003] However, in a vibration, impact or temperature alternating environment, the friction force of the thread pair gradually decreases due to material creep and stress relaxation, and the lack of active locking force compensation makes the screw prone to fretting wear or even complete loosening. Therefore, we need to propose a high-strength fixed inner rotation precision screw. SUMMARY

[0004] The utility model discloses a high-strength fixed inner rotation precision screw, aiming at solving the problems raised in the above background technology.

[0005] To achieve the above purpose, the utility model provides the following technical scheme:

[0006] A high-strength fixed inner rotation precision screw, comprising a screw head, a screw rod, an inner rotation groove and a threaded portion, the bottom of the screw head is fixedly connected with a connecting rod, the bottom end of the connecting rod is fixedly connected with the top end of the screw rod, a self-adaptive locking assembly is sleeved on the outer wall of the connecting rod, the threaded portion is provided on the outer wall of the screw rod, the bottom end of the screw rod is fixedly connected with a fixed block, a plurality of groups of blind holes are provided in the interior of the fixed block, the plurality of groups of blind holes are arranged in a ring array, and the interiors of the plurality of groups of blind holes are respectively provided with anti-disengagement assemblies.

[0007] Preferably, the self-adaptive locking assembly comprises a sliding part, the sliding part is sleeved on the outer wall of the connecting rod, a plurality of groups of clamping strips are fixedly connected to the top of the sliding part, the plurality of groups of clamping strips are arranged in a ring array, the top of the plurality of groups of clamping strips is fixedly connected with the bottom of the connecting rod, and a plurality of groups of clamping strips are respectively provided with a bending part.

[0008] Preferably, the sliding part is arranged in a ring shape, and a through groove adapted to the connecting rod is provided in the interior of the sliding part, and the connecting rod is slidingly inserted into the interior of the through groove.

[0009] Preferably, the anti-disengagement assembly comprises a sliding block which is slidingly inserted into the interior of the blind hole, one end of the sliding block is fixedly connected with a protruding portion, and the other end of the sliding block is fixedly connected with a return spring, one end of the return spring is fixedly connected with the inner wall of one side of the blind hole.

[0010] Preferably, the top of the sliding block is fixedly connected with a guide block, a guide groove which is matched with the guide block is formed in the inner wall of the blind hole, and the guide block is slidingly connected into the interior of the guide groove.

[0011] Preferably, the inner rotating groove is in the form of a special-shaped groove, and the inner rotating groove comprises a cross groove and an inner hexagonal groove.

[0012] Preferably, the utility model also comprises a bushing which is formed in the interior of the screw head and penetrates the screw head.

[0013] Compared with the prior art, the utility model has the beneficial effects that:

[0014] 1、The utility model discloses a self-adapting locking assembly which can automatically adjust the locking force under different working conditions, effectively offsets the pre-tightening force attenuation caused by vibration, impact or temperature change, and actively compensates the locking force compared with the passive anti-loosening mode of the traditional screw which relies on friction, thereby significantly reducing the loosening risk.

[0015] 2、The utility model discloses an annular array blind hole and an embedded anti-disengagement assembly which form a double anti-disengagement mechanism, and the anti-disengagement assembly provides mechanical interlocking when subjected to axial tension, prevents the screw rod from being completely disengaged, and further improves the connection safety. DRAWINGS

[0016] Figure 1 It is a structural schematic view of the utility model;

[0017] Figure 2 It is a structural schematic view of the shaft side of the utility model;

[0018] Figure 3 It is a structural schematic view of the screw head, connecting rod and screw rod of the utility model;

[0019] Figure 4 It is a structural schematic view of the screw head and inner rotating groove of the utility model;

[0020] Figure 5 It is a structural schematic view of the fixed block and anti-disengagement assembly of the utility model.

[0021] In the figure: 1, screw head; 2, screw rod; 3, inner rotation groove; 31, cross groove; 32, inner hexagonal groove; 4, threaded part; 5, connecting rod; 6, self-adaptive locking assembly; 601, sliding part; 602, clamping strip; 603, bending part; 7, fixed block; 8, blind hole; 9, anti-disengagement assembly; 901, sliding block; 902, protruding part; 903, return spring; 10, through groove; 11, guide block; 12, guide groove; 13, insertion hole. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0023] Please refer to Figures 1-5 The utility model provides a technical scheme:

[0024] A high-strength fixed inner rotation precision screw, including screw head 1, screw rod 2, inner rotation groove 3 and threaded part 4, the bottom of screw head 1 is fixedly connected with connecting rod 5, the bottom end of connecting rod 5 is fixedly connected with the top end of screw rod 2, connecting rod 5 adopts gradually changing diameter design (such as taper transition), make the stress distribution between screw head 1 and screw rod 2 more uniform, avoid the stress concentration problem of traditional right-angle connecting place, the outer wall of connecting rod 5 is sleeved with self-adaptive locking assembly 6, self-adaptive locking assembly 6 is made of high-elasticity alloy (such as beryllium bronze), its outer surface is provided with micro-convex grain, and self-adaptive frictional contact is generated with the surface of the connected part during pre-tightening, when external vibration or temperature change leads to the decline of pre-tightening force, the assembly compensates the pressure in real time through elastic deformation, maintains the stability of locking force, by setting self-adaptive locking assembly 6, locking force can be automatically adjusted under different working conditions, effectively offsets the pre-tightening force attenuation caused by vibration, impact or temperature change, compared with the passive anti-loosening mode of traditional screw relying on friction force, self-adaptive locking assembly 6 can actively compensate locking force, significantly reduces the loosening risk;

[0025] Threaded part 4 is opened on the outer wall of screw rod 2, threaded part 4 adopts double lead design, main thread is responsible for bearing, vice thread (micro-tooth structure) is embedded in the inner wall of the connected part, forms multiple-point occlusion, shear strength is greatly improved, the bottom end of screw rod 2 is fixedly connected with fixed block 7, a plurality of groups of blind holes 8 are opened in the inside of fixed block 7, a plurality of groups of blind holes 8 are arranged in annular array, and the inside of a plurality of groups of blind holes 8 is provided with anti-disengagement assembly 9 respectively, by setting annular array blind hole 8 and embedding anti-disengagement assembly 9, double anti-disengagement mechanism is formed, anti-disengagement assembly 9 provides mechanical interlocking when subjected to axial tension, prevents screw rod 2 from completely disengaging, further improves the connection safety.

[0026] The self-adaptive locking assembly 6 comprises a sliding part 601 sleeved on the outer wall of the connecting rod 5, a plurality of sets of clamping strips 602 are fixedly connected to the top of the sliding part 601, the plurality of sets of clamping strips 602 are arranged in an annular array, the top of each of the plurality of sets of clamping strips 602 is fixedly connected to the bottom of the connecting rod 5, and a bending part 603 is arranged on each of the plurality of sets of clamping strips 602;

[0027] The sliding part 601 is arranged in an annular shape, and a through groove 10 adapted to the connecting rod 5 is formed in the inside of the sliding part 601, the connecting rod 5 is slidingly inserted into the inside of the through groove 10, and a polytetrafluoroethylene coating is applied to the inner wall of the through groove 10 of the sliding part 601 to reduce the frictional resistance with the connecting rod 5 and ensure the sensitivity of the locking force adjustment; when the screw is subjected to transverse vibration, the elastic deformation of the bending part 603 can absorb vibration energy to reduce the stress fluctuation amplitude of the threaded part 4;

[0028] The anti-disengagement assembly 9 comprises a sliding block 901 slidingly inserted into the inside of the blind hole 8, a protruding part 902 is fixedly connected to one end of the sliding block 901, and a return spring 903 is fixedly connected to the other end of the sliding block 901, one end of the return spring 903 is fixedly connected to the inner wall of one side of the blind hole 8; when the screw rod 2 is subjected to an axial tension, the sliding block 901 slides outward along the blind hole 8, the protruding part 902 and the inner wall of the connected part form a mechanical interlock, and the return spring 903 ensures that the assembly is automatically reset after the tension is removed, which is suitable for fastening the aircraft skin and can withstand repeated impacts of aerodynamic loads during flight;

[0029] A guide block 11 is fixedly connected to the top of the sliding block 901, a guide groove 12 adapted to the guide block 11 is formed in the inner wall of the blind hole 8, the guide block 11 is slidingly connected to the inside of the guide groove 12, the guide groove 12 adopts a dovetail groove structure to limit the sliding block 901 to move only in the axial direction and prevent lateral deviation from causing jamming, and the return spring 903 is made of high-temperature-resistant stainless steel wire and has a working temperature range of -50℃ to 300℃;

[0030] The inner rotary groove 3 is arranged in a special-shaped groove, and the inner rotary groove 3 comprises a cross-shaped groove 31 and an inner hexagonal groove 32; by arranging the special-shaped inner rotary groove 3, the screw head 1 can be adapted to various disassembly tools, such as a straight screwdriver, a cross screwdriver, an inner hexagonal wrench, an outer hexagonal wrench or a socket wrench, so that the disassembly application range of the screw head 1 is wider;

[0031] It also comprises a jack 13 formed in the inside of the screw head 1 and penetrating the screw head 1; after a special locking pin (not shown) is inserted into the jack 13, the screw head 1 can be physically blocked from rotating, thereby achieving multiple anti-loosening.

[0032] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-strength fixed internal spiral precision screw, comprising a screw head (1), a screw rod (2), an internal spiral groove (3) and a threaded portion (4), characterized in that: The bottom of the screw head (1) is fixedly connected with a connecting rod (5), the bottom end of the connecting rod (5) is fixedly connected with the top end of the screw rod (2), the outer wall of the connecting rod (5) is sleeved with a self-adaptive locking assembly (6), the threaded portion (4) is arranged on the outer wall of the screw rod (2), the bottom end of the screw rod (2) is fixedly connected with a fixed block (7), a plurality of groups of blind holes (8) are arranged in the fixed block (7), a plurality of groups of the blind holes (8) are arranged in an annular array, and the inner parts of a plurality of groups of the blind holes (8) are respectively provided with anti-disengagement assemblies (9).

2. A high-strength fixed internal-rotation precision screw according to claim 1, characterized in that: The self-adaptive locking assembly (6) comprises a sliding part (601), the sliding part (601) is sleeved on the outer wall of the connecting rod (5), a plurality of groups of clamping strips (602) are fixedly connected to the top of the sliding part (601), a plurality of groups of the clamping strips (602) are arranged in an annular array, the top of a plurality of groups of the clamping strips (602) is fixedly connected with the bottom of the connecting rod (5), and a plurality of groups of the clamping strips (602) are respectively provided with bending parts (603).

3. A high-strength fixed internal-rotation precision screw according to claim 2, characterized in that: The sliding part (601) is arranged in an annular shape, and the inner part of the sliding part (601) is provided with a through groove (10) matched with the connecting rod (5), and the connecting rod (5) is slidingly inserted into the through groove (10).

4. The high-strength fixed internal-rotation precision screw according to claim 1, characterized in that: The anti-disengagement assembly (9) comprises a sliding block (901), the sliding block (901) is slidingly inserted into the blind hole (8), one end of the sliding block (901) is fixedly connected with a protruding part (902), the other end of the sliding block (901) is fixedly connected with a reset spring (903), and one end of the reset spring (903) is fixedly connected with the inner wall of the blind hole (8).

5. A high-strength fixed internal-rotation precision screw according to claim 4, characterized in that: The top of the sliding block (901) is fixedly connected with a guide block (11), the inner wall of the blind hole (8) is provided with a guide groove (12) matched with the guide block (11), and the guide block (11) is slidingly connected in the guide groove (12).

6. The high-strength fixed internal-rotation precision screw according to claim 1, wherein: The inner rotating groove (3) is arranged in a special-shaped groove, and the inner rotating groove (3) comprises a cross groove (31) and an inner hexagonal groove (32).

7. The high-strength fixed internal-rotation precision screw according to claim 1, wherein: It also comprises a jack (13), the jack (13) is arranged in the inner part of the screw head (1), and the jack (13) penetrates through the screw head (1).

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