Anti-loosening structure of thread pair

Abstract

The utility model relates to the technical field of fasteners, and discloses a thread pair anti-loosening structure which comprises an anti-loosening bolt and a nut and further comprises an anti-loosening cap, a screw rod of the anti-loosening bolt comprises a threaded section and a connecting section, the anti-loosening cap comprises a large-diameter section and a small-diameter section, the nut is arranged on the threaded section, the anti-loosening cap is arranged on the screw rod of the anti-loosening bolt in a sleeved mode, and the anti-loosening nut is arranged on the connecting section. The large-diameter section is connected with the nut, and the small-diameter section is connected with the connecting section. The connection strength and quality of the thread pair anti-loosening structure can be guaranteed, production and installation can be facilitated, and the using effect of the thread pair anti-loosening structure is effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to fastener technical field especially relates to a thread pair anti -loose structure. BACKGROUND

[0002] Thread connection is one of the most common connection modes in mechanical connection, which is embodied in the wide application of various bolt connections. Two or more parts are tightly connected together through the cooperation of bolts and nuts. From aerospace, equipment manufacturing, and construction engineering to household appliances and children's toys, bolt connection is indispensable. The main components of bolt connection include bolts, nuts, and connecting pieces. By tightening the nut, the bolt rod generates tensile force, forming pre-tightening force to clamp the connecting piece and achieve firm connection.

[0003] Since the emergence of thread connection, the problem of loosening has been faced. Most structures connected by threads bear various dynamic loads, and the thread pair inevitably bears the corresponding impact and vibration. Due to the inherent thread angle characteristics of the thread pair, under the action of vibration and impact, the nut and bolt will have a slight relative displacement in the thread slope direction. With the continuous vibration, the relative displacement will gradually increase, eventually leading to nut loosening, causing connection failure, and further damaging the connection structure, resulting in equipment accidents, and even endangering people's life safety. Therefore, various bolt loosening methods have emerged. The common methods include double-nut structure, spring pad, stop washer, use of nylon inserts or application of thread locking glue, but the technical performance parameters of various methods are uneven in actual use.

[0004] A Chinese utility model patent with patent number ZL202122534998.1 discloses a loosening-resistant bolt, which includes a bolt body, a nut, and a latch. The bolt body includes a threaded column with a strip-shaped through hole. The nut has a through hole corresponding to the strip-shaped through hole. The latch passes through the through hole and the strip-shaped through hole to limit the bolt body and the nut.

[0005] The above patent and existing technology at least have the following problems: First, in order to insert the latch, the nut may be over-tightened or under-tightened, which seriously affects the connection strength and quality of the bolt and affects the service life. Second, the overall structure is complex and expensive, which is not conducive to large-scale production and manufacturing. Third, the installation steps are complicated, which is not conducive to on-site construction and installation. UTILITY MODEL CONTENTS

[0006] The utility model aims to overcome the deficiencies of the prior art and develop a thread pair anti-loose structure. The utility model can ensure the connection strength and quality of the thread pair anti-loose structure, facilitate production and installation, and effectively improve the use effect of the thread pair anti-loose structure.

[0007] The utility model discloses a technical scheme for solving technical problems: a threaded pair anti-loosening structure, including lock bolt and nut, still including lock cap, the screw rod of lock bolt includes threaded section and connecting section, and the lock cap includes large diameter section and small diameter section, and the nut is arranged on the threaded section, and the lock cap is sleeved on the screw rod of lock bolt, and the large diameter section is connected with the nut, and the small diameter section is connected with the connecting section.

[0008] As optimization, the projection of the connecting section is arranged in the projection of the threaded section.

[0009] As optimization, the lower part of the connecting section is provided with an inner recess positioning groove, the lower part of the small diameter section is inwardly recessed with a protrusion, the protrusion is arranged in the positioning groove, and the inner side wall of the small diameter section is matched with the side wall of the connecting section.

[0010] As optimization, the upper part of the connecting section is a straight prism, the positioning groove is a ring positioning groove, and the protrusion is a ring protrusion.

[0011] As optimization, the side surface of the straight prism of the connecting section is an inner recess arc surface, and the upper side surface of the small diameter section is matched with the inner recess arc surface of the straight prism.

[0012] As optimization, the connecting section is a light rod, the positioning groove is a clamping groove type positioning groove, the protrusion is a clamping groove type protrusion matched with the positioning groove, and the protrusion is provided with at least one group.

[0013] As optimization, the top of the connecting section is provided with an indicating groove.

[0014] As optimization, the side wall of the large diameter section is an inner recess arc surface, and the inner side surface is provided with a net pattern, so that the friction between the lock cap and the nut is increased.

[0015] Compared with the prior art, the utility model has the beneficial effects that:

[0016] Through setting up the threaded section, the threaded section can be connected with the nut, through setting up the connecting section, the connecting section can be connected with the lock washer, through setting up the lock washer including the large diameter section and the small diameter section, first, the nut and the connecting section can be wrapped from the outside at the same time, the bolt and the nut are linked together to form a whole, only same direction synchronous movement can be made, relative movement between the bolt and the nut is prevented, so that the loosening condition is avoided, second, the on-site pre-tightening process of the nut is not affected, the threaded pair lock structure can obtain suitable pre-tightening force, the connection strength and quality are guaranteed, the whole is high in aesthetic degree, simple in structure, convenient for production and processing and on-site installation, suitable for large-scale production and manufacturing, only need to install the lock washer and press to complete the installation. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the overall structure schematic view of the first embodiment of the utility model.

[0018] Figure 2 It is the top view of the first embodiment of the utility model.

[0019] Figure 3 It is the overall structure schematic view of the second embodiment of the utility model.

[0020] Figure 4 It is the cross section schematic view of the positioning groove of the connecting section in the second embodiment of the utility model.

[0021] Figure 5 It is the installation schematic view of the first embodiment of the utility model.

[0022] In the drawing: 1, lock bolt; 2, nut; 3, lock washer; 4, threaded section; 5, connecting section; 6, large diameter section; 7, small diameter section; 8, positioning groove; 9, protrusion; 10, indicating groove. DETAILED DESCRIPTION

[0023] In order to clearly illustrate the technical features of the scheme, the utility model is described in detail below through specific implementation manner and in conjunction with its drawings.

[0024] Embodiment 1

[0025] Figure 1 And Figure 2 It is one embodiment of the utility model, as Figure 1 And Figure 2As shown, a thread pair anti-loosening structure includes an anti-loosening bolt 1 and a nut 2, and further includes an anti-loosening cap 3, the screw rod of the anti-loosening bolt 1 includes a threaded section 4 and a connecting section 5, the anti-loosening cap 3 includes a large-diameter section 6 and a small-diameter section 7, the nut 2 is arranged on the threaded section 4, the anti-loosening cap 3 is sleeved on the screw rod of the anti-loosening bolt 1, the large-diameter section 6 is connected with the nut 2, the small-diameter section 7 is connected with the connecting section 5, and a transition section is arranged between the large-diameter section 6 and the small-diameter section 7.

[0026] By arranging the threaded section 4, the nut 2 can be connected; by arranging the connecting section 5, the anti-loosening cap 3 can be connected; by arranging the anti-loosening cap 3 to include the large-diameter section 6 and the small-diameter section 7, firstly, the nut 2 and the connecting section 5 can be wrapped from the outside at the same time, the relative position of the anti-loosening bolt 1 and the nut 2 is locked, the anti-loosening bolt 1 and the nut 2 are linked together to form a whole, and only the same direction synchronous movement can be made, the relative movement between the anti-loosening bolt 1 and the nut 2 is prevented, and thus the loosening is avoided; secondly, the on-site pre-tightening process of the nut 2 is not affected, the anti-loosening bolt can obtain a suitable pre-tightening force, the connection strength and quality are ensured, the whole is high in aesthetic degree, the structure is simple, and production and processing and on-site installation are facilitated.

[0027] The projection of the connecting section 5 is arranged in the projection of the threaded section 4, so that the nut 2 can pass through the connecting section 5 smoothly and be connected with the threaded section 4.

[0028] The lower part of the connecting section 5 is provided with an inner recessed positioning groove 8, the lower part of the small-diameter section 7 is inwardly recessed to be provided with a protrusion 9, the protrusion 9 is arranged in the positioning groove 8, and the inner side wall of the small-diameter section 7 cooperates with the side wall of the connecting section 5. By arranging the positioning groove 8 and the protrusion 9, the shape is complementary after clamping and pressing, the anti-loosening cap 3 can be fixed, the anti-loosening cap 3 is prevented from moving axially, and the anti-loosening cap 3 is prevented from being separated from the anti-loosening bolt 1.

[0029] The upper part of the connecting section 5 is any one of a three-prism, a four-prism, a five-prism or a six-prism, the positioning groove 8 is a V-shaped annular positioning groove, and the protrusion 9 is an annular protrusion matched with the V-shaped annular positioning groove. By arranging the upper part of the connecting section 5 to be a straight prism, production and processing are facilitated, the small-diameter section 7 can be fully in contact with the connecting section 5, and the rotation and slipping between the small-diameter section 7 and the connecting section 5 is prevented; the V-shaped annular positioning groove cooperates with the V-shaped annular protrusion to effectively prevent the anti-loosening cap 3 from moving axially.

[0030] The side surface of the straight prism of the upper part of the connecting section 5 is a vertical inner recessed arc surface. The small-diameter section 7 is further in contact and combined with the connecting section 5 after clamping and pressing, the shape of the side surface of the small-diameter section 7 after clamping and pressing is an inner recessed arc shape matched with the inner recessed arc surface of the connecting section 5, the anti-loosening cap 3 and the anti-loosening bolt 1 are connected together, and the rotation and slipping between the small-diameter section 7 and the connecting section 5 is prevented.

[0031] The top of the connecting section 5 is provided with an indicating groove 10 corresponding to the polygon of the straight prism. By providing the indicating groove 10, the position of the straight prism can be confirmed by the construction personnel to press the small-diameter section 7 by means of a tool.

[0032] The side wall of the large-diameter section 6 is a vertical concave arc surface, and the inner side is provided with a pattern to increase the friction. The lower part of the large-diameter section 6 is provided with a flared opening outward, which can provide a guiding effect during installation. The concave arc surface can directly clamp the nut 2, avoid relative movement between the large-diameter section 6 and the nut 2, ensure the connection strength and quality, prevent the lock washer 3 from being separated from the nut 2, and prevent the large-diameter section 6 and the nut 2 from rotating and slipping.

[0033] Embodiment 2

[0034] Figure 3 And Figure 4 Embodiment 2 of the utility model, which is different from embodiment 1, the connecting section 5 is a light pole, the positioning groove 8 is a clamping groove type positioning groove, the protrusion 9 is a protrusion matched with the positioning groove 8, and the protrusion 9 is provided with at least one group. The indicating groove 10 corresponds to the positioning groove 8, which can help the construction personnel to confirm the position of the positioning groove 8. By providing the light pole, the lock bolt 1 can be conveniently processed. By providing the clamping groove type positioning groove and the clamping groove type protrusion, they can be matched with each other, which can prevent the lock washer 3 from moving axially and prevent the small-diameter section 7 and the connecting section 5 from rotating and slipping.

[0035] As Figure 5 shown, during installation, the construction personnel first installs the nut 2, and the nut 2 is pre-tightened to the threaded section 4 of the lock bolt 1 through threads, and maintains appropriate pre-tightening force. It should be noted that, in Figure 2 , the nut 2 and the straight prism have no position corresponding relationship;

[0036] Secondly, the lock washer 3 is installed, the large-diameter section 6 is sleeved on the nut 2, and the large-diameter section 6 will not affect the field pre-tightening process of the nut 2. The small-diameter section 7 is sleeved on the connecting section 5. In the initial state, the lock washer 3 is in a cylindrical shape, the cross section of the large-diameter section 6 is a hexagon matched with the nut, and the cross section of the small-diameter section 7 is a circle.

[0037] Finally, the clamping pliers are sleeved on the small-diameter section 7, the bottom of the clamping pliers abuts against the transition section, the relative position of the positioning protrusions and the jaw dies of the clamping pliers is fixed in the clamping closed state, and the relative position of the positioning protrusions and the positioning groove 8 is the same as that of the indicating groove 10 and the positioning groove 8, so that the clamping pliers can accurately find the position of the positioning groove 8 through the indicating groove 10. The jaw dies of the clamping pliers are inwardly clamped on the lower part of the small-diameter section 7 to form the protrusion 9, the protrusion 9 is accurately positioned in the positioning groove 8 through the positioning effect of the indicating groove 10, the whole clamping process does not affect the installation and pre-tightening process of the nut 2, and the lock bolt can always maintain a proper pre-tightening force. The utility model not only guarantees the overall strength of the lock structure of the threaded pair, but also facilitates production and installation, and effectively improves the use effect of the lock bolt.

[0038] If the connecting section 5 is a smooth rod, the positioning groove 8 is a clamping groove type positioning groove, that is, the embodiment 2, the clamping pliers are sleeved on the small-diameter section 7, the bottom of the clamping pliers abuts against the transition section, the clamping pliers are provided with positioning protrusions corresponding to the indicating groove 10, the relative position of the positioning protrusions and the jaw dies of the clamping pliers is fixed in the clamping closed state, and the relative position of the positioning protrusions and the positioning groove 8 is the same as that of the indicating groove 10 and the positioning groove 8, so that the clamping pliers can accurately find the position of the positioning groove 8 through the indicating groove 10. The jaw dies of the clamping pliers are inwardly clamped on the lower part of the small-diameter section 7 to form the protrusion 9, the protrusion 9 is accurately positioned in the positioning groove 8 through the positioning effect of the indicating groove 10, the whole clamping process does not affect the installation and pre-tightening process of the nut 2, and the lock bolt can always maintain a proper pre-tightening force. The utility model not only guarantees the overall strength of the lock structure of the threaded pair, but also facilitates production and installation, and effectively improves the use effect of the lock bolt.

[0039] In the utility model, the description of the direction or relative position relation of the structure, such as the direction or relative position relation indicated by ''center'', ''upper'', ''lower'', ''left'', ''right'', ''vertical'', ''horizontal'', ''inner'', ''outer'' and the like, is the direction or position relation shown based on the drawings, and is only for the convenience of describing the utility model and simplifying the description, and cannot be understood as the limitation on the utility model.

Claims

1. A threaded anti-loosening structure, comprising an anti-loosening bolt (1) and a nut (2), characterized in that, It also includes a tack cap (3); The anti-loosening bolt (1) has a threaded section (4) and a connecting section (5), and the anti-loosening cap (3) has a large diameter section (6) and a small diameter section (7); The nut (2) is set on the threaded section (4), the anti-loosening cap (3) is fitted on the thread of the anti-loosening bolt (1), the large diameter section (6) is connected to the nut (2), and the small diameter section (7) is connected to the connecting section (5).

2. The threaded anti-loosening structure according to claim 1, characterized in that, The projection of the connecting section (5) is set within the projection of the threaded section (4).

3. The threaded anti-loosening structure according to claim 1, characterized in that, The lower part of the connecting section (5) is provided with a recessed positioning groove (8), and the lower part of the small diameter section (7) is provided with a protrusion (9) recessed inward. The protrusion (9) is set in the positioning groove (8), and the inner side wall of the small diameter section (7) matches the side wall of the connecting section (5).

4. The threaded anti-loosening structure according to claim 3, characterized in that, The upper part of the connecting section (5) is a straight prism, the positioning groove (8) is an annular positioning groove, and the protrusion (9) is an annular protrusion that cooperates with the positioning groove (8).

5. The threaded anti-loosening structure according to claim 4, characterized in that, The side of the straight prism of the connecting section (5) is a concave arc surface, and the upper side of the small diameter section (7) matches the concave arc surface of the straight prism.

6. The threaded anti-loosening structure according to claim 3, characterized in that, The connecting section (5) is a smooth rod, the positioning groove (8) is a slot-type positioning groove, and the protrusion (9) is a concave protrusion that matches the positioning groove (8). There is at least one set of protrusions (9).

7. The threaded anti-loosening structure according to claim 5 or 6, characterized in that, The top of the connecting section (5) is provided with an indicator groove (10).

8. The threaded anti-loosening structure according to claim 7, characterized in that, The sidewall of the large diameter section (6) is a concave arc surface, and a mesh pattern is provided on the inner side. The lower part of the large diameter section (6) is provided with a flared opening.

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