Anti-cracking non-standard special-shaped large flat head fastener

Abstract

The utility model discloses an anti-cracking non-standard special-shaped large flat head fastener, and relates to the technical field. The bolt comprises a bolt body, the upper surface of the bolt body is rotationally sleeved with a fixing device, the fixing device comprises a base plate, the upper surface of the bolt body is slidably connected with a rotating disc, the outer surface of one side of the rotating disc can be provided with a push rod, the outer surface of the rotating disc is provided with three arc-shaped grooves, and the arc-shaped grooves are matched with the base plate. The upper surface of the base plate is fixedly connected with a top plate, the outer surface of the top plate is provided with a guide groove used in cooperation with the arc-shaped groove, and the transmission rod penetrates through the guide groove. By arranging the fixing device and the stud with the conical end, the fastening effect and stability of the bolt are effectively improved with the help of the spring washer and the cotter pin; the bolt is prevented from loosening under vibration or impact, and the risk of cracking in the bolt fastening process is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to technical fields, concretely is a kind of anti-cracking non-standard special-shaped large flat head fastener. BACKGROUND

[0002] Special-shaped large flat head fastener refers to the head shape as flat head, and has special shape or non-standard specification fastener.This fastener is usually used in the scene needing special fixing mode or adapting to special installation environment, common special-shaped large flat head fastener includes large flat head self-tapping screw, large flat head bolt etc., this bolt is mainly used in mechanical equipment, automobile manufacturing, electronic equipment, in short, special-shaped large flat head fastener can satisfy various complex installation needs due to its special head shape and specification, is widely used in machinery, automobile, electronics and other multiple fields.

[0003] Bolt is often loose after fastening due to the vibration of medium or impact load of external force, to cause the connection between bolt and connecting piece to produce gap, cause bolt to separate, and bolt can be cracked in the process of fastening due to excessive stress. UTILITY MODEL CONTENTS

[0004] In order to solve the problem of poor stability of bolt;The utility model aims at providing a kind of anti-cracking non-standard special-shaped large flat head fastener.

[0005] To solve the above technical problems, the utility model adopts the following technical scheme: a kind of anti-cracking non-standard special-shaped large flat head fastener, including bolt body, the upper surface of the bolt body is rotationally sleeved with fixing device, the fixing device includes bottom disc, the upper surface is slidably connected with rotating disc, the outer surface of the one side of rotating disc can be installed with push rod, the outer surface of rotating disc is equipped with three arc grooves, transmission rod is inserted in the arc groove, the top of transmission rod is fixedly connected with collet, the upper surface of bottom disc is fixedly connected with top disc, the outer surface of top disc is equipped with the guide groove that is used in cooperation with arc groove, transmission rod penetrates guide groove.

[0006] Preferably, the bolt body includes stud, the outer surface of the stud is threadedly sleeved with nut, the lower end outer surface of the stud is equipped with pin slot, open pin is slidably inserted in the interior of pin slot, the top of stud is fixedly connected with screw head.

[0007] Compared with prior art, the utility model has the beneficial effects that:

[0008] 1、The utility model through setting up fixing device and conical stud, effectively disperses stress under the help of spring washer and open pin, reduces the risk of cracking in the process of bolt fastening, collet and transmission groove etc. Component is mutually cooperated, realizes the locking of bolt, prevents bolt from loosening under vibration or impact. Attached Figure Description

[0009] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0010] Fig. 1 This is a schematic diagram of the structure of this utility model.

[0011] Fig. 2 This is a schematic diagram of the fixing device structure of this utility model.

[0012] Fig. 3 This is a schematic diagram of the bolt body structure of this utility model.

[0013] In the diagram: 1. Bolt body; 2. Fixing device; 11. Stud; 12. Nut; 13. Pin groove; 14. Cotter pin; 15. Spring washer; 16. Thread head; 21. Base plate; 22. Rotating plate; 23. Push rod; 24. Arc groove; 25. Transmission rod; 26. Collar; 27. Top plate; 28. Guide groove. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] Example: Figs. 1-3The utility model provides a kind of anti-cracking non-standard special-shaped big flat head fastener, including bolt body 1, the upper surface of bolt body 1 rotationally sleeve joint has fixing device 2, fixing device 2 includes bottom disc 21, upper surface slidingly connected has rotating disc 22, the outer surface of one side of rotating disc 22 can be installed push rod 23, the outer surface of rotating disc 22 is equipped with three arc grooves 24, arc groove 24 is inserted with transmission rod 25, the top end of transmission rod 25 is fixedly connected with collet 26, the upper surface of bottom disc 21 is fixedly connected with top disc 27, the outer surface of top disc 27 is equipped with the guide groove 28 used in cooperation with arc groove 24, transmission rod 25 penetrates guide groove 28, bottom disc 21 is circular, and it is convenient to contact with the surface of part, mounting hole is equipped on bottom disc 21, for fixing device 2 is fixed on part, the outer surface of three collets 26 can be abutted and fitted with screw head 16 side, can be placed in screw head 16 with fixing device 2, so that bottom disc 21 and the surface of part are in close contact, then rotating rotating disc 22 by push rod 23, by the transmission of arc groove 24 and the restriction of guide groove 28, the rotating force is converted into linear clamping motion, to realize the locking clamping of bolt body 1 under the clamping locking of three collets 26.

[0016] Bolt body 1 includes stud 11, the outer surface of stud 11 is threadedly sleeve-connected with nut 12, the lower end outer surface of stud 11 is equipped with pin groove 13, open pin 14 is slidably inserted in pin groove 13, the top end of stud 11 is fixedly connected with screw head 16, the diameter of the bottom end of stud 11 is less than the diameter of the top end, can be transmitted to connected member by rotating nut 12, rotating nut 12 is rotated to a certain degree, spring washer 15 can increase the friction between nut 12 and stud 11 by elastic force, and absorb part of vibration energy, reduce the relative motion between bolt body 1 and nut 12, insert open pin 14 into pin groove 13, bend the end of open pin 14, cross one end of open pin 14 on one side of stud 11, so as to reduce the cracking phenomenon of bolt body 1 in the fastening process, prevent bolt body 1 from loosening accidentally in vibration.

[0017] The arc-shaped grooves 24 and the guide grooves 28 are arranged in an annular array, the outer surface of the transmission rod 25 is in sliding fit with the outer surface of the arc-shaped grooves 24, the outer surface of the circular groove in the middle of the base plate 21 is in sliding fit with the outer surface of the screw head 16, the transmission rod 25 and the clamping head 26 are arranged in an annular array, and the lower surface of the clamping head 26 is in sliding fit with the upper surface of the top plate 27, the spring washer 15 is movably sleeved on the upper surface of the stud 11, the bottom end of the stud 11 is tapered, the positions of the arc-shaped grooves 24 and the guide grooves 28 arranged in an annular array correspond to each other, which can provide a given trajectory for the movement of the three transmission rods 25, help the three transmission rods 25 change from arc motion to linear motion, and drive the clamping head 26 to move synchronously along the guide groove 28, the sliding fit surfaces ensure the stability and smoothness of the adjustment, the spring washer 15 can increase the friction between the nut 12 and the stud 11 by the elastic force, absorb part of the vibration energy, and reduce the relative movement between the bolt body 1 and the nut 12, and the bottom end of the stud 11 is tapered, so that the tapered part can gradually adapt to the shape of the hole, thereby dispersing stress and avoiding excessive extrusion and friction at the edge of the hole.

[0018] Working principle: when the bolt body 1 needs to be tightened, the stud 11 in the bolt body 1 passes through the hole of the part to be connected, and the nut 12 is located at the end of the stud 11. When the nut 12 is rotated, the rotating nut 12 moves upward along the threads on the outer surface of the stud 11 during rotation. When the pre-tightening point is reached, the spring washer 15 will give the nut 12 an elastic force, increasing the friction between the nut 12 and the stud 11, and when the bolt body 1 is subjected to vibration, it plays a certain buffering role. The operator inserts the cotter pin 14 into the pin slot 13, bends one end of the cotter pin 14, and makes the end of the cotter pin 14 open and span across one end of the pin slot 13, thereby preventing the nut from loosening. The tapered end of the stud 11 helps to reduce stress concentration and reduce the risk of cracking.

[0019] When the bolt body 1 needs to be locked, the operator can push the push rod 23 to make the rotating disc 22 rotate inside the base plate 21. The rotating rotating disc 22 drives the three transmission rods 25 and the clamping head 26 to move along the arc-shaped grooves 24 in an arc trajectory. The three moving transmission rods 25 convert the arc motion into linear motion under the limitation of the three guide grooves 28, causing one end of the clamping head 26 to approach the center of the screw head 16. When the push rod 23 is rotated to a certain extent, one end of the three clamping heads 26 is jointly clamped and fixed with the outer surface of the screw head 16, thereby locking and fixing the bolt body 1, achieving the purpose of fixing the bolt body 1.

[0020] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application also intends to include these modifications and variations.

Claims

1. A non-splitting non-standardized large flat head fastener comprising a bolt body (1) characterized in that: The upper surface of the bolt body (1) is rotatably sleeved with a fixing device (2); The fixing device (2) comprises a bottom disc (21), the upper surface is slidably connected with a rotating disc (22), one side of the outer surface of the rotating disc (22) is mounted with a push rod (23), three arc-shaped grooves (24) are formed in the outer surface of the rotating disc (22), a transmission rod (25) is inserted into the arc-shaped grooves (24), the top end of the transmission rod (25) is fixedly connected with a clamping head (26), the upper surface of the bottom disc (21) is fixedly connected with a top disc (27), the outer surface of the top disc (27) is provided with a guide groove (28) matched with the arc-shaped grooves (24), and the transmission rod (25) penetrates through the guide groove (28).

2. A non-splitting non-customized large flat head fastener according to claim 1, wherein, The bolt body (1) comprises a stud (11), the outer surface of the stud (11) is threadedly sleeved with a nut (12), the lower end of the outer surface of the stud (11) is provided with a pin groove (13), the inner part of the pin groove (13) is slidably inserted with a split pin (14), and the top end of the stud (11) is fixedly connected with a screw head (16).

3. A non-splitting non-customized large flat head fastener as claimed in claim 1, wherein, The arc-shaped grooves (24) and the guide grooves (28) are arranged in an annular array, and the outer surface of the transmission rod (25) is slidably attached to the outer surface of the arc-shaped grooves (24).

4. The anti-splitting non-standardized large flat head fastener of claim 1, wherein, The outer surface of the bottom disc (21) is provided with a through-type circular groove, and the outer surface of the circular groove is slidably attached to the outer surface of the screw head (16).

5. The anti-splitting non-standardized large flat head fastener of claim 1, wherein, The transmission rod (25) and the clamping head (26) are arranged in an annular array, and the lower surface of the clamping head (26) is slidably attached to the upper surface of the top disc (27).

6. A non-rupture resistant non-odd shaped large flat head fastener as described in claim 2, wherein, The upper surface of the stud (11) is movably sleeved with a spring washer (15).

7. A non-ribbed, non-odd-shaped, large flat head fastener according to claim 2, wherein One side of the three clamping heads (26) is abuttingly attached to the outer surface of the screw head (16).

8. A non-ribbed, non-odd shaped, large flat head fastener according to claim 2, wherein, The bottom end of the stud (11) is conical.

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