Anti-loosening rapid expansion countersunk bolt

Abstract

The utility model discloses an anti-loosening quick expansion countersunk bolt, and particularly relates to the technical field of expansion countersunk bolts, the anti-loosening quick expansion countersunk bolt comprises a countersunk bolt, an expansion sleeve is sleeved on the outer side of the countersunk bolt, and an anti-loosening mechanism is arranged between the countersunk bolt and the expansion sleeve; the anti-loosening mechanism comprises a fixing nut, the fixing nut is connected to the outer side of the countersunk bolt in a threaded mode, a wear-resisting gasket is installed at the top of the expansion sleeve, and a flat gasket is arranged at the top of the wear-resisting gasket. By arranging the anti-loosening mechanism, the anti-loosening capacity after preliminary fastening is improved from multiple aspects, and when the fixing nut tends to loosen and rotate due to external force such as vibration, the reacting force generated by deformation of the second elastic washer can further prevent the fixing nut from loosing and rotating; meanwhile, the anti-loosening effect is remarkably enhanced through stress between the thread bushing and double threads of the fixing nut and the countersunk bolt, and it is ensured that the bolt can be kept in a fastened state in the complex vibration environment.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of expansion countersunk head bolt, more specifically, the utility model relates to anti-loose quick expansion countersunk head bolt. BACKGROUND

[0002] In many fields such as mechanical connection and building installation, bolt connection is a common and important connection method, and its stability and reliability are crucial. Expansion countersunk head bolt is a special type of bolt improved on the basis of countersunk head bolt and combined with expansion fastening principle.

[0003] Through retrieval, the Chinese patent with the publication number CN222513636U discloses an expansion bolt with an auxiliary installation structure. The existing expansion bolt needs to be pre-punched before installation, and the punching process is prone to skew. Installing the expansion bolt in the skewed hole can cause the locking nut and the equipment outer facade to be unable to fit, resulting in uneven stress during tightening and affecting the stability of bolt fastening. The screw rod and the expansion rod are connected by rotation, so that the screw rod and the expansion rod can be stretched at a certain angle, the expansion pipe is fitted with the pre-punched hole, the screw rod is perpendicular to the equipment facade, and the nut is parallelly fitted with the facade, greatly improving the stability of the expansion bolt.

[0004] Expansion bolts only form a tight connection with the hole wall through expansion, and the fixing method of the bolt and the hole wall is still relatively single. Under the influence of long-term vibration, impact and complex environment, the expansion bolt is prone to loosening. For example, chemical equipment is affected by vibration and corrosion, and automobile parts are affected by long-term mechanical impact. Loosening of the bolt often causes safety hazards, and it is difficult to meet the strict requirements for stability and reliability of the bolt. UTILITY MODEL CONTENTS

[0005] In order to overcome the problems and defects in the prior art, the utility model provides an anti-loose quick expansion countersunk head bolt to solve the problems in the background art.

[0006] To achieve the above purpose, the utility model provides the following technical scheme: an anti-loose quick expansion countersunk head bolt, comprising a countersunk head bolt, an expansion sleeve is sleeved outside the countersunk head bolt, and an anti-loose mechanism is arranged between the countersunk head bolt and the expansion sleeve.

[0007] The anti-loosening mechanism comprises a fixed nut, the fixed nut is threadedly connected outside the countersunk bolt, the expansion sleeve is provided with a wear-resistant washer at the top, the wear-resistant washer is provided with a flat washer at the top, the flat washer is provided with a first elastic washer at the top, the fixed nut is provided with a threaded sleeve at the top, the threaded sleeve is provided with a connecting groove at the bottom surface, the second elastic washer is arranged between the threaded sleeve and the fixed nut, the second elastic washer is sleeved outside the countersunk bolt, the second elastic washer is provided with a connecting hole at the top surface, the fixed nut is fixedly connected with a reinforcing rod at the top, and the countersunk bolt is provided with a reinforcing mechanism inside.

[0008] Preferably, the reinforcing mechanism comprises a threaded hole, the threaded hole is arranged at the top surface of the countersunk bolt, and a threaded rod is threadedly connected in the threaded hole.

[0009] Preferably, the threaded rod is fixedly connected with a pressing ball at the bottom, the pressing ball is arranged in the fixed groove, and a movable friction block is slidably connected in the fixed groove.

[0010] Preferably, the threaded rod is fixedly connected with a screw head at the top.

[0011] Preferably, the expansion sleeve is fixedly connected with a plurality of friction strips outside.

[0012] Preferably, the reinforcing rod is movably clamped between the connecting groove and the second elastic washer.

[0013] Preferably, the wear-resistant washer, the flat washer and the first elastic washer are sleeved outside the countersunk bolt, and the wear-resistant washer, the flat washer and the first elastic washer are arranged between the fixed nut and the expansion sleeve.

[0014] The technical effects and advantages of the utility model are as follows:

[0015] 1. The anti-loosening mechanism is arranged, the wear-resistant washer and the flat washer reduce the abrasion between the fixed nut and the expansion sleeve, prolong the service life of the components, increase the contact area, make the pressure uniformly distributed, avoid the loosening hidden danger caused by excessive local pressure, the first elastic washer generates a reverse force by using elasticity, effectively prevents the loosening trend of the fixed nut under external force, improves the anti-loosening ability after preliminary fastening from multiple aspects, when the fixed nut has a loosening rotation trend due to vibration and other external forces, the reinforcing rod has a relative movement trend in the connecting groove and presses the second elastic washer, the reverse force generated by the deformation of the second elastic washer can further prevent the loosening rotation of the fixed nut, the stress between the threaded sleeve, the fixed nut and the countersunk bolt is significantly enhanced, and the anti-loosening effect is obviously improved, so that the bolt can also be kept in a fastened state in a complex vibration environment.

[0016] 2、By setting reinforcing mechanism, when rotating screw head, threaded rod drives downward ball to extrude moving friction block in fixed groove downward, moving friction block moves outward and generates greater friction with expansion sleeve, further enhances the fixing effect of countersunk head bolt in connected object, greatly improves the carrying capacity and stability of bolt, prevents displacement or loosening under stress, multiple friction strips fixedly connected outside expansion sleeve can increase the friction between the hole wall of connected object when expansion sleeve expands with the tightening of countersunk head bolt, further prevents loosening of the whole bolt assembly, and makes the connection between the bolt and the connected object more closely. BRIEF DESCRIPTION OF DRAWINGS

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

[0018] Figure 2 It is the partial structure schematic view of the utility model.

[0019] Figure 3 It is the bottom view structure schematic view of the utility model.

[0020] Figure 4 It is the structure schematic view of the anti-loosening mechanism of the utility model.

[0021] Figure 5 It is the Figure 3 It is the enlarged structure schematic view of A place in the middle.

[0022] Figure 6 It is the internal structure schematic view of the countersunk head bolt of the utility model.

[0023] The figure mark is: 1, countersunk head bolt;2, expansion sleeve;3, fixed nut;4, wear-resistant washer;5, flat washer;6, first elastic washer;7, threaded sleeve;8, connecting groove;9, second elastic washer;10, connecting hole;11, reinforcing rod;12, friction strip;13, threaded hole;14, threaded rod;15, screw head;16, downward ball;17, fixed groove;18, moving friction block. DETAILED DESCRIPTION

[0024] The technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model, obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model.

[0025] As shown in the accompanying Figures 1-6The illustrated anti-loose quick expansion countersunk bolt, including countersunk bolt 1, countersunk bolt 1 outside set with expansion sleeve 2, countersunk bolt 1 and expansion sleeve 2 between the anti-loose mechanism is set;

[0026] Anti-loose mechanism includes fixed nut 3, fixed nut 3 is threadedly connected to the outside of the countersunk bolt 1, the expansion sleeve 2 top is provided with wear-resistant washer 4, wear-resistant washer 4 top is provided with flat washer 5, flat washer 5 top is provided with the first elastic washer 6, fixed nut 3 top is provided with threaded sleeve 7, threaded sleeve 7 bottom surface is provided with connecting groove 8, threaded sleeve 7 and fixed nut 3 between the installation of the second elastic washer 9, the second elastic washer 9 is set on the outside of the countersunk bolt 1, the second elastic washer 9 top surface is provided with connecting hole 10, fixed nut 3 top is fixedly connected with reinforcing rod 11, countersunk bolt 1 inside is provided with reinforcing mechanism.

[0027] As shown in Figure 1 , 2 , 3, 6, reinforcing mechanism includes threaded hole 13, threaded hole 13 is set in the top surface of the countersunk bolt 1, threaded hole 13 is threadedly connected with threaded rod 14 inside, countersunk bolt 1 inside is provided with fixed groove 17, threaded rod 14 bottom is fixedly connected with the pressing ball 16, the pressing ball 16 is arranged in the fixed groove 17 inside, the fixed groove 17 inside is slidably connected with the moving friction block 18, threaded rod 14 top is fixedly connected with screw head 15, so that the threaded rod 14 rotates can be moved downward, so that the pressing ball 16 extrudes the moving friction block 18 moves, so that the moving friction block 18 moves out of the countersunk bolt 1, so that the moving friction block 18 and the expansion sleeve 2 between the greater friction, enhance the fixed effect of countersunk bolt 1.

[0028] As shown in Figures 1-4 , the expansion sleeve 2 outside is fixedly connected with the friction strip 12, the number of friction strip 12 is set to be multiple, further improve the friction between the expansion sleeve 2 and the aperture, so as to improve the fixing effect of the whole bolt, place the whole bolt loose.

[0029] As shown in Figure 3 , 5 , the reinforcing rod 11 and the connecting groove 8 and the second elastic washer 9 are movably clamped between them, so that the fixed nut 3, the second elastic washer 9 and the threaded sleeve 7 form a whole, so that the stress between the fixed nut 3 and the threaded sleeve 7 and the countersunk bolt 1 is superimposed, improve the overall anti-loose effect.

[0030] As shown in Figures 1-5 , the wear-resistant washer 4, the flat washer 5 and the first elastic washer 6 are set on the outside of the countersunk bolt 1, the wear-resistant washer 4, the flat washer 5 and the first elastic washer 6 are installed between the fixed nut 3 and the expansion sleeve 2, the anti-loose effect is improved by the plurality of washers.

[0031] The utility model discloses a working principle: fixed nut 3 is connected in the countersunk bolt 1 outside thread, is used for preliminary fastening, and the expansion sleeve 2 top is successively equipped with wear -resistant washer 4, flat washer 5 and first elastic washer 6, and they all are set in the countersunk bolt 1 outside and are located between fixed nut 3 and expansion sleeve 2, and wear -resistant washer 4 can reduce the wear and tear between fixed nut 3 and expansion sleeve 2, flat washer 5 increases the contact area, and the pressure distribution is more uniform, and first elastic washer 6 utilizes the elasticity of itself, provides reverse force when fixed nut 3 has the loosening tendency, hinders its loosening, and fixed nut 3 top is equipped with threaded sleeve 7, and threaded sleeve 7 bottom surface is equipped with connecting groove 8, when fixed nut 3 has loosening rotation tendency under the influence of vibration and other external force, and the relative movement tendency of strengthening rod 11 will be produced in connecting groove 8, and extrudes second elastic washer 9 simultaneously, and second elastic washer 9 produces deformation and provides reaction force, further prevents the loosening rotation of fixed nut 3, and the anti -loosening effect is enhanced;

[0032] The utility model discloses a working principle: fixed nut 3 is connected in the countersunk bolt 1 outside thread, is used for preliminary fastening, and the expansion sleeve 2 top is successively equipped with wear -resistant washer 4, flat washer 5 and first elastic washer 6, and they all are set in the countersunk bolt 1 outside and are located between fixed nut 3 and expansion sleeve 2, and wear -resistant washer 4 can reduce the wear and tear between fixed nut 3 and expansion sleeve 2, flat washer 5 increases the contact area, and the pressure distribution is more uniform, and first elastic washer 6 utilizes the elasticity of itself, provides reverse force when fixed nut 3 has the loosening tendency, hinders its loosening, and fixed nut 3 top is equipped with threaded sleeve 7, and threaded sleeve 7 bottom surface is equipped with connecting groove 8, when fixed nut 3 has loosening rotation tendency under the influence of vibration and other external force, and the relative movement tendency of strengthening rod 11 will be produced in connecting groove 8, and extrudes second elastic washer 9 simultaneously, and second elastic washer 9 produces deformation and provides reaction force, further prevents the loosening rotation of fixed nut 3, and the anti -loosening effect is enhanced;

[0033] Finally: the above embodiment only illustrates the principle of the utility model and its efficacy, and is not used to limit the utility model. Any person skilled in the art can modify or change the above embodiment without departing from the spirit and scope of the utility model. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the utility model should be covered by the claims of the utility model.

Claims

1. Anti-loosening quick expansion countersunk head bolt, comprising a countersunk head bolt (1), characterized in that: The countersunk bolt (1) is provided with an expansion sleeve (2) outside, and a anti-loosening mechanism is arranged between the countersunk bolt (1) and the expansion sleeve (2). The anti-loosening mechanism comprises a fixed nut (3), the fixed nut (3) is threadedly connected outside the countersunk bolt (1), the expansion sleeve (2) is provided with a wear-resistant washer (4) at the top, the wear-resistant washer (4) is provided with a flat washer (5) at the top, the flat washer (5) is provided with a first elastic washer (6) at the top, the fixed nut (3) is provided with a threaded sleeve (7) at the top, the threaded sleeve (7) is provided with a connecting groove (8) at the bottom surface, the threaded sleeve (7) and the fixed nut (3) are provided with a second elastic washer (9), the second elastic washer (9) is arranged outside the countersunk bolt (1), the second elastic washer (9) is provided with a connecting hole (10) at the top surface, the fixed nut (3) is fixedly connected with a reinforcing rod (11), and the countersunk bolt (1) is provided with a reinforcing mechanism.

2. The tamper-resistant quick-expanding flat head bolt of claim 1, wherein: The reinforcing mechanism comprises a threaded hole (13), the threaded hole (13) is arranged at the top surface of the countersunk bolt (1), and the threaded hole (13) is threadedly connected with a threaded rod (14).

3. The tamper-resistant quick-expanding flat head bolt of claim 2, wherein: The threaded rod (14) is fixedly connected with a pressing ball (16) at the bottom, the pressing ball (16) is arranged in the fixed groove (17), and the fixed groove (17) is slidably connected with a movable friction block (18).

4. The tamper-resistant quick expanding flat head bolt of claim 2, wherein: The threaded rod (14) is fixedly connected with a screw head (15) at the top.

5. The tamper-resistant quick expanding flat head bolt of claim 1, wherein: The expansion sleeve (2) is fixedly connected with a friction strip (12) outside, and the number of the friction strips (12) is multiple.

6. The tamper-resistant quick expanding flat head bolt of claim 1, wherein: The reinforcing rod (11) is movably clamped between the connecting groove (8) and the second elastic washer (9).

7. The tamper-resistant quick expanding flat head bolt of claim 1, wherein: The wear-resistant washer (4), the flat washer (5) and the first elastic washer (6) are arranged outside the countersunk bolt (1), and the wear-resistant washer (4), the flat washer (5) and the first elastic washer (6) are arranged between the fixed nut (3) and the expansion sleeve (2).

Images