A double-nut constrained anti-loosening bolt structure

Abstract

The present invention discloses a double-nut constrained anti-loosening bolt structure, comprising a bolt, two nuts, two upper latch pins and two lower latch pins; after the bolt is inserted through the corresponding through holes on the connecting piece, the two nuts are screwed on the two ends of the bolt and fit into the connecting piece; axial vertical slots are symmetrically opened on both sides of the bolt, the two upper latch pins are inserted into the vertical slots on the corresponding sides from above, and the two lower latch pins are inserted into the vertical slots on the corresponding sides from below, and the ends of the upper latch pin and the lower latch pin, which are away from each other, are bent outwards and abut against the nuts on the corresponding sides; an annular groove is formed on the inner sides of the ends of the two nuts that are close to each other, and a protrusion extending outwards into the annular groove is formed on the outer pin rods of the upper latch pin and the lower latch pin located in the annular groove section; a plurality of evenly distributed protrusions corresponding to the protrusions are formed around the inner wall of the annular groove, and the protrusion is located between the two protrusions, and the nut is prevented from rotating significantly relative to the upper latch pin and the lower latch pin through the obstruction of the protrusions, thereby improving the anti-loosening ability.

Description

Technical Field

[0001] The invention relates to a double-nut constrained anti-loosening bolt structure, belonging to the technical field of fasteners. Background Art

[0002] Bolt and nut fastening is a common connection structure used to secure mechanical equipment in everyday life. However, existing bolt and nut fastening structures can loosen during use due to vibration and other factors, leading to production accidents. Existing bolt and nut anti-loosening technologies aim to improve the stability of mechanical structures and prevent operational accidents caused by loose nuts. However, existing bolt and nut anti-loosening measures primarily use a double nut + washer method, which has poor anti-loosening performance and poses a potential threat to the safe operation of equipment. Summary of the Invention

[0003] The purpose of the present invention is to provide a double-nut constrained anti-loosening bolt structure, which forms an anti-loosening structure by cooperating with upper and lower pins and corresponding nuts, and improves the fit effect with the through hole of the connecting part through the interaction of the upper and lower pins, thereby improving the anti-loosening ability.

[0004] The technical solution adopted in the present invention is:

[0005] A double-nut constrained anti-loosening bolt structure comprises a bolt, two nuts, two upper bayonet pins and two lower bayonet pins. After the bolt is inserted through corresponding through holes on a connecting piece, the two nuts are screwed onto the two ends of the bolt and fit into the connecting piece. Axial vertical slots are symmetrically opened on both sides of the bolt. The two upper bayonet pins are inserted into the vertical slots on the corresponding sides from above, and the two lower bayonet pins are inserted into the vertical slots on the corresponding sides from below. The ends of the upper bayonet pins and the lower bayonet pins that are away from each other are bent outwards to abut against the nuts on the corresponding sides.

[0006] An annular groove is formed on the inner side of the ends of the two nuts close to each other, and a protrusion extending outward into the annular groove is formed on the outer pin rods of the upper and lower bayonet pins located in the annular groove section; a plurality of evenly distributed protrusions corresponding to the protrusions are formed around the inner wall of the annular groove, and the protrusion is located between the two protrusions. The nut is prevented from rotating significantly relative to the upper and lower bayonet pins by the obstruction of the protrusions.

[0007] Preferably, the inner pin rod end of the upper bayonet is located below the outer pin rod end, and the outer pin rod end is tilted toward the outside of the bolt;

[0008] The end of the inner pin rod of the lower bayonet is located above the end of the outer pin rod, and the ends of the outer pin rod and the inner pin rod are both inclined toward the outside of the bolt;

[0009] After the upper and lower bayonet pins located in the same vertical slot are inserted, the inner pin rod of the lower bayonet pin abuts against the end of the inner pin rod of the upper bayonet pin, and the end of the inner pin rod of the lower bayonet pin presses against the end of the outer pin rod of the upper bayonet pin, so that the end of the outer pin rod of the upper bayonet pin is in close contact with the through hole.

[0010] Preferably, a buffer gap is left between the inner pin rod and the outer pin rod of the upper and lower bayonet pins.

[0011] Preferably, radial transverse slots are provided at both ends of the bolt and are connected to the vertical slots on both sides;

[0012] A concave limiting rod is embedded at both ends of the bolt. Both ends of the limiting rod abut against the bent ends of the upper or lower bayonet pins on the corresponding sides, and the middle section of the limiting rod is fixed to the end of the bolt.

[0013] Preferably, corresponding rivet holes are provided at the center of the middle section of the limiting rod and the center of the bolt, and the limiting rod and the end of the bolt are fixed by rivets.

[0014] Preferably, washers are respectively provided on the bolts between the nuts and the corresponding side connectors.

[0015] Preferably, anti-slip grooves are provided on the side of the gasket that is in contact with the corresponding side connector.

[0016] Preferably, the number of the bumps is 8-12.

[0017] Preferably, the end surfaces of the raised portions on the upper and lower bayonet pins close to the bent ends abut against the annular grooves at the corresponding ends.

[0018] The beneficial effects of the present invention are:

[0019] 1. The raised portions on the outer pins of the upper and lower bayonet pins in the annular groove extend between the two protrusions in the annular groove. After installation, the restraining effect of the protrusions prevents the nut from rotating significantly relative to the upper and lower bayonet pins, thereby preventing the nut from falling off the bolt to a certain extent.

[0020] 2. After the upper and lower bayonet pins located in the same vertical slot are inserted, the inner pin rod of the lower bayonet pin abuts against the end of the inner pin rod of the upper bayonet pin, and the end of the inner pin rod of the lower bayonet pin presses against the end of the outer pin rod of the upper bayonet pin, so that the end of the outer pin rod of the upper bayonet pin is in close contact with the through hole, thereby preventing the bolt and the connecting piece from rotating to a certain extent. The restrictive effect between the protrusion and the raised portion further ensures the anti-loosening effect of the bolt and nut;

[0021] 3. The ends of the upper and lower bayonet pins that are away from each other are bent outward to abut against the corresponding side nuts, and the upper and lower bayonet pins are limited by the limit rod to prevent the upper and lower bayonet pins from falling off from the vertical slots due to vibration. It can also ensure the pressing effect of the contact ends of the upper and lower bayonet pins, ensure the integrity of the anti-loosening structure and thus ensure the anti-loosening effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1It is a cross-sectional view of a double-nut constrained anti-loosening bolt structure;

[0023] Figure 2 is the cross-sectional view of the bolt;

[0024] Figure 3 is a cross-sectional view of the nut;

[0025] The main reference numerals in the figures have the following meanings:

[0026] 1. Bolt, 2. Nut, 3. Upper latch, 4. Lower latch, 5. Washer, 6. Vertical notch, 7. Annular groove, 8. Raised portion, 9. Bump, 10. Horizontal notch, 11. Limit rod. DETAILED DESCRIPTION

[0027] The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0028] like Figure 1-3 As shown: This embodiment is a double-nut constrained anti-loosening bolt structure, including a bolt 1, two nuts 2, two upper bayonet pins 3 and two lower bayonet pins 4; see Figure 1 As shown, after the bolt 1 is inserted through the corresponding through hole on the connecting piece, washers 5 are first installed on the bolts 1 on both sides of the connecting piece. In order to improve the anti-loosening effect, anti-slip grooves are provided on the side of the washer 5 that fits with the corresponding side connecting piece; then two nuts 2 are screwed onto the two ends of the bolt 1 and the washers 5 are squeezed to make them fit with the connecting piece.

[0029] See also Figure 2 As shown, axial vertical slots 6 are symmetrically opened on both sides of the bolt 1, and the two upper bayonet pins 3 are inserted into the vertical slots 6 on the corresponding sides from the top, and the two lower bayonet pins 4 are inserted into the vertical slots 6 on the corresponding sides from the bottom. The ends of the upper bayonet pins 3 and the lower bayonet pins 4 that are away from each other are bent outwards and abut against the nuts 2 on the corresponding sides.

[0030] The end of the inner pin rod of the upper bayonet 3 is located below the end of the outer pin rod, and the end of the outer pin rod is tilted toward the outside of the bolt 1; the end of the inner pin rod of the lower bayonet 4 is located above the end of the outer pin rod, and the ends of the outer pin rod and the inner pin rod are both tilted toward the outside of the bolt 1; after the upper bayonet 3 and the lower bayonet 4 located in the same vertical slot 6 are inserted, the inner pin rod of the lower bayonet 4 abuts against the end of the inner pin rod of the upper bayonet 3, and the end of the inner pin rod of the lower bayonet 4 presses against the end of the outer pin rod of the upper bayonet 3, applying an outward force to make the end of the outer pin rod of the upper bayonet 3 fit tightly against the through hole of the connecting piece, so as to prevent rotation between the bolt 1 and the connecting piece to a certain extent.

[0031] The two nuts 2 are in a convex shape, and an annular groove 7 is formed on the inner side of the two nuts 2 near each other. The outer pin rods of the upper bayonet 3 and the lower bayonet 4 located in the annular groove 7 are formed with a protrusion 8 extending outward into the annular groove 7, and the end surfaces of the protrusion 8 near the bent end of the upper bayonet 3 and the lower bayonet 4 abut against the annular groove 7 at the corresponding end; see Figure 3 As shown, 8-12 evenly distributed protrusions 9 corresponding to the raised portions 8 are formed around the inner wall of the annular groove 7. The raised portion 8 is located between the two protrusions 9. After the bolt 1 and nut 2 are installed, the protrusions 9 can prevent the nut 2 from rotating significantly relative to the upper and lower detent pins 3 and 4 through the blocking effect of the protrusions 9. Since the upper and lower detent pins 3 and 4 are located in the vertical notch 6 of the bolt 1, the nut 2 can be prevented from rotating relative to the bolt 1, thereby preventing the nut 2 from loosening from the bolt 1.

[0032] In order to prevent vibration from damaging the structure of the bolt 1, a certain buffer gap is left between the inner pin rod and the outer pin rod of the upper bayonet 3 and the lower bayonet 4.

[0033] In order to further improve the anti-loosening effect, radial transverse slots 10 are provided at both ends of the bolt 1 and are connected to the vertical slots 6 on both sides; a concave limiting rod 11 is embedded at both ends of the bolt 1, and corresponding rivet holes are provided at the center of the middle section of the limiting rod 11 and the center of the bolt 1, and the limiting rod 11 is fixed to the end of the bolt 1 by rivets; after riveting, the two ends of the limiting rod 11 are respectively abutted against the bent ends of the upper retaining pin 3 or the lower retaining pin 4 on the corresponding side, and the upper retaining pin 3 and the lower retaining pin 4 are limited by the limiting rod 11 to prevent the upper retaining pin 3 and the lower retaining pin 4 from falling off from the vertical slot 6 due to vibration, and can also ensure the pressing effect of the contact ends of the upper retaining pin 3 and the lower retaining pin 4, thereby ensuring the integrity of the anti-loosening structure and thus ensuring the anti-loosening effect.

[0034] The above is only a preferred embodiment of the patent of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the patent of the present invention. These improvements and modifications should also be regarded as the scope of protection of the patent of the present invention.

Claims

1. A double-nut constrained anti-loosening bolt structure, characterized in that: The invention comprises a bolt, two nuts, two upper bayonet pins and two lower bayonet pins. After the bolt is inserted through the corresponding through-holes on the connecting piece, the two nuts are screwed onto the two ends of the bolt and fit into the connecting piece. Axial vertical slots are symmetrically opened on both sides of the bolt. The two upper bayonet pins are inserted into the vertical slots on the corresponding sides from above, and the two lower bayonet pins are inserted into the vertical slots on the corresponding sides from below. The ends of the upper bayonet pins and the lower bayonet pins that are away from each other are bent outwards and abut against the nuts on the corresponding sides. An annular groove is formed on the inner sides of the ends of the two nuts that are close to each other. The outer pin rods of the upper and lower bayonet pins located in the annular groove are formed with a protrusion extending outward into the annular groove. A plurality of evenly distributed protrusions corresponding to the protrusions are formed around the inner wall of the annular groove. The protrusion is located between the two protrusions. The protrusions prevent the nuts from rotating significantly relative to the upper and lower bayonet pins. The end of the inner pin rod of the upper clamping pin is located below the end of the outer pin rod, and the end of the outer pin rod is inclined toward the outside of the bolt; The end of the inner pin rod of the lower bayonet is located above the end of the outer pin rod, and the ends of the outer pin rod and the inner pin rod are both inclined toward the outside of the bolt; After the upper and lower bayonet pins located in the same vertical slot are inserted, the inner pin rod of the lower bayonet pin abuts against the end of the inner pin rod of the upper bayonet pin, and the end of the inner pin rod of the lower bayonet pin presses against the end of the outer pin rod of the upper bayonet pin, so that the end of the outer pin rod of the upper bayonet pin is in close contact with the through hole.

2. The double-nut constrained anti-loosening bolt structure according to claim 1, characterized in that: A buffer gap is left between the inner pin rod and the outer pin rod of the upper bayonet and the lower bayonet.

3. The double-nut constrained anti-loosening bolt structure according to claim 1, characterized in that: A radial transverse slot is provided at both ends of the bolt and is connected to the vertical slots on both sides; A concave limiting rod is embedded at both ends of the bolt. Both ends of the limiting rod abut against the bent ends of the upper or lower bayonet pins on the corresponding sides, and the middle section of the limiting rod is fixed to the end of the bolt.

4. The double-nut constrained anti-loosening bolt structure according to claim 3, characterized in that: Corresponding rivet holes are opened at the center of the middle section of the limiting rod and the center of the bolt, and the limiting rod and the end of the bolt are fixed by rivets.

5. The double-nut constrained anti-loosening bolt structure according to claim 1, characterized in that: Washers are respectively sleeved on the bolts between the nuts and the corresponding side connecting pieces.

6. The double-nut constrained anti-loosening bolt structure according to claim 5, characterized in that: Anti-slip grooves are provided on the side of the gasket that fits the corresponding side connector.

7. The double-nut constrained anti-loosening bolt structure according to claim 1, characterized in that: The number of the bumps is 8-12.

8. The double-nut constrained anti-loosening bolt structure according to claim 1, characterized in that: The end surfaces of the protrusions on the upper and lower bayonet pins close to the bent ends abut against the annular grooves at the corresponding ends.

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