CN219317395U - Device for preventing nut from loosening - Google Patents

Abstract

The utility model belongs to the technical field of threaded connection, and discloses a device for preventing a nut from loosening. The anti-loosening device is a rivet, the rivet is fixed in a rivet hole in a screw outside the nut in a riveting manner, the rivet hole is subjected to positioning expansion through a positioning device, the anti-loosening device is further provided with a positioning device, the positioning device is provided with a positioning sleeve, a circular through hole is formed in the middle of the positioning sleeve, a punch is inlaid in the through hole, and angles of the punch are respectively alpha 1=90 degrees, alpha 2=120 degrees, alpha 3=30 degrees and alpha 4=180 degrees, and the inside of the rivet hole is in a V shape. No anti-loose element is used. The fastening and dismounting do not affect the mechanism body to work under vibration working conditions, and the mechanism needs semi-permanent or permanent fastening. The structure is simple, the effect is obvious, the fastening operation is simpler and more convenient by making the standard component, and the inspection work can be reduced by adopting the fastening bolt for fixed connection.

Description

Device for preventing nut from loosening

Technical Field

The utility model belongs to the technical field of advanced manufacturing and automation, and particularly relates to a device for preventing a nut from loosening.

Background

Screw-threaded couplings are currently one of the most common and important ways of coupling in the manufacturing industry. The nut is a part which is screwed together with the bolt or the screw rod to play a role in fastening, and the working principle of the nut is to self-lock by adopting friction force between the nut and the bolt. In order to prevent the nut from loosening, some anti-loosening measures must be taken, especially in important occasions, the reliability of the locking of the nut must be ensured, and although many methods are adopted in the design, manufacture and process of the parts connected with the nut for solving the problem, the method is effective, but in a mechanism working under a more frequent vibration working condition, the connection is loosened, thereby causing serious accidents and losses. Taking the mode of adopting the elastic washer and adopting the riveted mode as an example of the current common adoption, adopting the mode of adopting the elastic washer because the vibrations of fastened work piece often can extrude the elastic washer between bolt and the nut, the elastic washer can lose the fastening effect to the nut after long-term use, and adopts the riveted mode, and the operation is more troublesome and bulky, difficult dismantlement.

Through the above analysis, the prior art has the following problems: the existing nut loosening prevention device has defects in threaded connection under the frequent vibration working condition.

Disclosure of Invention

Aiming at the problems existing in the prior art, the utility model provides a device for preventing a nut from loosening.

The utility model is realized in that a nut loosening prevention device comprises:

a nut;

the nut is fixedly connected with the stud through threaded connection.

Further, the anti-loosening device is a rivet, and the rivet is fixed in a rivet hole in the stud connected with the nut in a riveting manner.

Further, the riveting holes are positioned and expanded through a positioning device.

Further, the positioning device is provided with a positioning sleeve, a circular through hole is formed in the middle of the positioning sleeve, and a punch is embedded in the through hole.

Further, the punch is provided with four angles α1=90 °, α2=120 °, α3=30°, and α4=180°, respectively.

Further, the inside of the rivet hole is V-shaped.

In combination with the technical scheme and the technical problems to be solved, the technical scheme to be protected has the following advantages and positive effects:

the first embodiment of the utility model has the advantages that the nut combining process is arranged, the operation is simple, the anti-loosening effect after fastening can be similar to the riveting connection effect, and any anti-loosening element is not needed to be added. But compared with riveting connection, the riveting connection saves space and workload and is convenient to detach. Compared with the connection of elastic pad gaskets, the elastic pad gaskets are more firm and stable, are not easy to fail, and save space and materials.

Secondly, the technical proposal to be protected has the technical effects and advantages as follows:

the embodiment of the utility model has simple structure and obvious effect, the fastening operation of the threaded connection is simpler and more convenient after the standard component is manufactured, and the reliability is greatly increased, the space, the materials and the working strength are saved and the workload of the follow-up loosening inspection is greatly reduced after the connection mode is adopted.

Thirdly, as inventive supplementary evidence of the claims of the present utility model, it is also reflected in the following important aspects:

the expected benefits and commercial values after the technical scheme of the utility model is converted are as follows: by adopting the mode in wide threaded connection, the saved materials cannot be measured manually, and more importantly, the fault rate and the workload of loose inspection are greatly reduced due to the improvement of the reliability.

The technical scheme of the utility model fills the technical blank in the domestic and foreign industries: similar connection modes do not appear in the domestic threaded connection industry.

The utility model solves the problem that the existing threaded connection is easy to fail in a mechanism working under a more frequent vibration working condition, and compared with other nut loosening prevention devices, the nut loosening prevention device is more reliable, has smaller workload, lower cost and saves more space.

Drawings

FIG. 1 is a schematic view of a nut loosening prevention device according to an embodiment of the present utility model;

FIG. 2 is a schematic diagram of a punch according to an embodiment of the present utility model;

FIG. 3 is a schematic view of a positioning device according to an embodiment of the present utility model;

in the figure: 1. a nut; 2. a screw; 3. a rivet; 4. a punch; 5. a positioning sleeve; 6. and a through hole.

Detailed Description

The present utility model will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

In order to fully understand how the utility model may be embodied by those skilled in the art, this section is an illustrative embodiment in which the claims are presented for purposes of illustration.

As shown in fig. 1 to 3, the nut loosening prevention device provided by the embodiment of the utility model includes: nut 1, screw 2, rivet 3, drift 4, spacer bush 5, through-hole 6.

The nut 1 is fixedly connected with the screw 2 through threaded connection, an anti-loosening device is fixed outside the nut 1.

The anti-loosening device is a rivet 3, and the rivet 3 is fixed in a riveting hole in the screw 2 outside the nut 1 in a riveting manner.

The riveting holes are positioned and expanded through a positioning device.

The positioning device is provided with a positioning sleeve 5, a circular through hole 6 is arranged in the middle of the positioning sleeve 5, and a punch 4 is embedded in the through hole 6.

The punch 4 is provided with four angles α1=90 °, α2=120 °, α3=30°, and α4=180°, respectively.

The inside of the rivet hole is V-shaped.

The screw riveting structure of the utility model is characterized in that after the nut 1 is fastened, a special tool or a small hammer is used for hammering the outer part of the screw head nut 1, and the deformed outer diffusion rib nut 1 is riveted. The process of the screw riveting requires that the outer screw of the nut 1 must have a certain length.

The heads of the bolts and the screws 2 are used for processing riveting process holes according to certain requirements, and the depth of the holes is larger than the riveting length of the external chisel of the nut 1.

The working principle of the utility model is described below in connection with an embodiment of a specific application.

In the utility model, when the nut 1 works, the nut 1 is fastened by a torque wrench according to a specified torque, the screw head needs to be manufactured to be 3-5mm in length, the length can be measured in advance by adding the thickness of the fastened mechanism to the thickness of the nut 1 by about 5mm, a bolt or a screw 2 with proper length is selected, and the nut 1 is sleeved for positioning by a positioning tool shown in fig. 3.

The punch 4 is naturally aligned with the center of the end face of the screw head after positioning, and the punch 4 is in a triangular positioning pit on the end face of the screw head. The hand drill is aligned with the central pit for drilling. Typically 5mm-6mm. The diameter of the caulking hole is about 1/2d1 (screw bottom diameter) for the bolt and screw 2, and about 0.4d1 (screw bottom diameter) for the bolt and screw 2 with the diameter of M16 or more. For larger diameter bolts, screws 2. After drilling, the wall thickness of the hole should be no more than 5mm. After punching, the hole is spread by one of the four punches 4 shown.

And C is to fix the punch 4, rivet the punch 4 by A or B, rivet the punch by D, and repeatedly and powerfully impact the punch 4 by a hammer in operation, wherein the metal deformation of the riveting part is reserved on the screw head, thus the operation can be completed. And the screws 2 below M5 are riveted by using the C-shaped punch 4 to form V-shaped holes, the small screws 2 below M2 do not need punching, and the heads of the screws 2 are directly tapped after fastening. High-strength screw 2, bolt or corbel with performance grade more than 8.8 and more than M16, after punching, adopting punch 4 to spin rivet; the rotary electric hand drill is arranged on the electric hand drill, the punch 4 is aligned to the Kong Yongli disc for spinning, the rotatable part on the punch 4 is pressed, friction and heat are generated at high speed, deformation can occur under the double effects of heat and pressure, and the shape shown in fig. 3 is formed. In operation, the rotation pressure is light and then heavy, and finally the end face is struck by the punch 4 to form a V shape. The punch 4 a.b.c.d. is quenched with tool steel. E. The F-spinning punch 4 is used to improve the spinning steel. The punch 4C cone is 30 ° mainly operated for pilot hole. The dimension of the punch 4A, B is 90 degrees and 120 degrees respectively, the dimension D is the last press riveting wedge. The spinning punches 4, E and F are respectively 90 DEG 120 cone. Rivets 3 below M16, preferably with a type a of 90 ° and screws 2 above M16, are proposed to operate with a type B of 120 ° cone, spinning punch 4. E. F is in the form of 90 DEG and 120 DEG cones respectively, and the section of the rib (working surface) on the punch 4 and the pressing surface are arc-shaped. In practical use, the number of the working press bars is preferably 3, and the working press bars are arranged on the section of the cone at 120 degrees. In actual operation, the riveting process holes of the screw 2 and the head of the stud are machined before installation and fastening. And after fastening, punching is performed, and the riveting process can be directly performed.

The working requirements of the same kind of bolts and screws 2 can be entrusted to standard component factories to manufacture the riveting process holes at one time according to the drawing. The head nut 1 must be reserved for H > l, i.e. the process hole depth.

For the bolt 2 with the diameter of the process hole of less than M12 and the bolt 2 with the diameter of the process hole of = 1/2d1 (a threaded base) of more than M200, the head of the nut 1 is reserved with a length L part, and a screw-in part can be removed.

When the equipment assembled by the screw riveting method needs to be disassembled, the screw rod of the screw part is twisted off by using a larger spanner for the nut 1 below 3 mm. The bolt and the screw 2 with the diameter of more than 3mm can be disassembled by cutting off the riveting part by using a 90-degree cone arranged on the electric hand drill.

The utility model is applied to field vehicle-mounted equipment of a certain army, passes the vibration environment test of long distance and a large number of off-road conditions, and has far better reliability than the traditional anti-loosening device.

In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front," "rear," "head," "tail," and the like are used as an orientation or positional relationship based on that shown in the drawings, merely to facilitate description of the utility model and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the utility model. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The foregoing is merely illustrative of specific embodiments of the present utility model, and the scope of the utility model is not limited thereto, but any modifications, equivalents, improvements and alternatives falling within the spirit and principles of the present utility model will be apparent to those skilled in the art within the scope of the present utility model.

Claims (1)

1. A nut loosening prevention device, characterized in that the nut loosening prevention device comprises:

a nut;

the nut is fixedly connected with the screw through threaded connection, and an anti-loosening device is fixed outside the nut;

the anti-loosening device is a rivet, and the rivet is fixed in a rivet hole in the screw outside the nut in a riveting manner;

the riveting holes are positioned and expanded through a positioning device;

the nut loosening prevention device is also provided with a positioning device, the positioning device is provided with a positioning sleeve, a circular through hole is arranged in the middle of the positioning sleeve, and a punch is embedded in the through hole;

the punch is provided with four angles α1=90 °, α2=120 °, α3=30° and α4=180°, respectively;

the inside of the rivet hole is V-shaped.

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