CN114857149A - Anti-loose hot-melting self-tapping and bolt - Google Patents

Abstract

The invention discloses a loose-proof hot-melting self-tapping bolt, which is characterized by comprising the following components: the screw rod (12) of the screw (1) is distributed from bottom to top, and the pointed end (11), the first tapping thread (1211), the first fastening thread (1212), the friction column (122) and/or the second tapping thread (1231), the second fastening thread (1232), the groove (131) and the head (13) are/is arranged on the screw rod; the screw (12) is formed by axially connecting a first screw (121), the friction column (122) and a second screw (123), the surface of the first screw (121) is distributed with a first tapping thread (1211) and a first fastening thread (1212), and one end of the first screw is connected with the pointed end (11); and, through two kinds of screw thread angles, realize the block between bolt and the plate and be connected, realize locking effect.

Description

Anti-loose hot-melting self-tapping screw bolt

Technical Field

The invention relates to a hot-melting self-tapping screw, in particular to a hot-melting self-tapping screw with anti-loosening effect.

Background

The existing hot melt self-tapping (FDS) is connected with a plate, and a hot melt self-tapping screw rotates at a high speed to soften the metal surface of the plate. And, can realize the single face and connect, need not to punch in advance, joint strength is high, and the screw that connects can be dismantled, conveniently changes and retrieves. The screw does not need to be deformed, so that the screw can be used for connecting dissimilar metals or the same metal. For example: ultrahigh-strength steel, aluminum-magnesium alloy and composite materials. Hot melt self-tapping (FDS) currently makes extensive use of the process in aluminum vehicle bodies. However, if the hot melt self-tapping device is made non-detachable, the anti-loose connection of the hot melt self-tapping device is more favorable.

Disclosure of Invention

Provided are a hot-melt self-tapping bolt and a check bolt including the same, which realize anti-loose connection by using two thread angles.

In order to achieve the above object, the present invention provides an anti-loosening hot-melt self-tapping bolt, comprising: the screw rod (12) of the screw (1) is distributed from bottom to top, and the pointed end (11), the first tapping thread (1211), the first fastening thread (1212), the friction column (122) and/or the second tapping thread (1231), the second fastening thread (1232), the groove (131) and the head (13) are/is arranged on the screw rod;

the screw (12) is formed by axially connecting a first screw (121), the friction column (122) and a second screw (123), the surface of the first screw (121) is distributed with a first tapping thread (1211) and a first fastening thread (1212), and one end of the first screw is connected with the pointed end (11); the second fastening threads (1232) and/or the second tapping threads (1231) are distributed on the surface of the second screw (123), and one end of the second screw is connected with the head (13); the groove (131) is formed in the surface of one side, connected with the second screw (123), of the head (13);

wherein the first tapping thread (1211) has the same angle of lead angle as the first fastening thread (1212); the second threading (1231) and the second fastening thread (1232) have a lead angle of the same angle; the first fastening thread (1212) and the second fastening thread (1232) have lead angles that are not the same.

Further, the anti-loosening bolt (2) is composed of the pointed end (11), the first screw (121), the friction column (122), the second screw (123), the third screw (21), the head (13), the nut (3) and the anti-loosening cap (4). The surface of the first screw rod (121) is provided with the first fastening thread (1212), the surface of the second screw rod (123) is provided with the second fastening thread (1232), and the surface of the third screw rod (21) is provided with the third fastening thread (211).

Further, check bolt (2) from top to bottom by friction post (122), third screw rod (21), head (13), nut (3) locking cap (4) are constituteed, third screw rod (21) surface distribution has third fastening screw thread (211).

Further, the plate (5) is composed of a first panel (51) and a second panel (52), the first contact surface of the tip (11) of the screw (1) and the plate (5) is the first panel (51), and the second panel (52) is the plate (5) overlapped with the first panel (51).

Further, in the plate (5), the time and the heating temperature of the rotating friction of the tip (11) of the screw (1) on the first panel (51) are greater than those of the rotating friction of the second panel (52).

Further, when the second fastening screw (1232) is in contact with the inner surface of the plate (5), the inner surface of the plate (5) is in a hot-melt state, and is plastically deformed by the second fastening screw (1232).

Further, the friction column (122) is a triangular prism or a cylinder or a truncated cone with a trapezoidal side surface.

Further, the outer surface of the friction column (122) is provided with the second tapping thread (1231), and the diameter of the second tapping thread (1231) is smaller than or equal to that of the second fastening thread (1232).

Further, the thread profile of the first fastening thread (1212) is different from the thread profile of the second fastening thread (1232); alternatively, the thread profile of the first fastening thread (1212) is the same as the thread profile of the second fastening thread (1232).

In the embodiment of the invention: through set up the screw thread of two kinds of angles on the screw rod, in hot melt self-tapping and panel hot melt connection process, be connected the screw thread on the screw rod with the plate of surface hot melt. The external thread of the screw rod is fixedly attached to the internal thread of the inner surface of the plate after connection. And, through two kinds of screw thread angles, realize the block between bolt and the plate and be connected, realize locking effect.

Drawings

Fig. 1 is a schematic structural view of six stages in the forming process of the anti-loosening hot-melt self-tapping and bolt hot-melt self-tapping of the present invention.

Fig. 2 is a schematic perspective view of the anti-loosening hot-melting self-tapping screw and the hot-melting self-tapping screw of the bolt of the invention, wherein the diameter of the second screw is larger than that of the first screw.

FIG. 3 is a schematic side view of the anti-loosening self-threading hot melt bolt of the present invention with the second screw diameter being greater than the first screw diameter.

Fig. 4 is a schematic side view of the anti-loosening hot-melt self-threading bolt of the present invention including a second tapping thread in the second screw.

FIG. 5 is a schematic side view of the anti-loosening hot melt self-threading bolt of the present invention with the second screw diameter being greater than the first screw diameter.

FIG. 6 is a schematic side sectional view of a plate after being connected to the plate according to the present invention when the second screw diameter of the anti-loosening self-threading and hot-melting self-threading bolt of the present invention is greater than the first screw diameter.

Fig. 7 is a schematic side view of the anti-loosening hot melt self-tapping screw and bolt of the present invention having a second fastening thread diameter larger than the first fastening thread diameter.

Fig. 8 is a schematic perspective view of the anti-loosening hot-melting self-tapping screw and the hot-melting self-tapping screw of the present invention, wherein the diameter of the second screw is equal to the diameter of the first screw.

FIG. 9 is a schematic side view of the anti-loosening hot melt self-threading bolt of the present invention with the second screw diameter equal to the first screw diameter.

Fig. 10 is a schematic side view of the anti-loosening hot melt self-threading and bolt hot melt self-threading second screw of the present invention including a second thread.

FIG. 11 is a schematic side view of the anti-loosening hot melt self-threading bolt of the present invention with the hot melt self-threading thread being a continuous variable thread.

FIG. 12 is a schematic side view of the anti-loosening hot melt self-threading bolt of the present invention in a combination of a thick thread and a thin thread.

Fig. 13 is a schematic side view of the anti-loosening thermally fused self-threading bolt of the present invention showing the lead angle of the first fastening screw being greater than the lead angle of the second fastening screw.

FIG. 14 is a schematic side view of the hot melt self-threading fastener of the present invention in combination with a hot melt drill.

Fig. 15 is a schematic perspective exploded view of the anti-loose self-tapping screw and the bolt of the screw and the hot-melting self-tapping screw combined into the anti-loose bolt according to the present invention.

Fig. 16 is a schematic side exploded view of the anti-loosening self-tapping screw and the bolt of the present invention combined with a self-tapping screw.

Fig. 17 is a schematic view of the hollow tube of the locking cap of the locking hot melt self-threading and bolt of the present invention in an upward perspective view.

Fig. 18 is a schematic side sectional view of the locking cap of the locking hot melt self-threading and bolt of the present invention.

FIG. 19 is a schematic perspective exploded view of the anti-loosening self-tapping and hot-melting bolt of the present invention, wherein one end of the bolt rod of the anti-loosening bolt is connected with a friction column.

FIG. 20 is a schematic side exploded view of the anti-loosening self-threading bolt of the present invention with a friction post attached to one end of the bolt shank.

Fig. 21 is a schematic view of the hollow tube of the locking cap of the locking hot melt self-threading and bolt of the present invention in an upward perspective view.

Fig. 22 is a schematic side sectional view of the locking cap panel of the locking hot melt self-threading and bolt of the present invention including a panel through hole 414.

FIG. 23 is a schematic side sectional view of a hollow frustoconical locking cap tube for a hot melt self-threading and bolting configuration in accordance with the present invention.

In the figures, the reference numerals are explained as follows:

1, a screw; 11 pointed ends; 12, a screw rod; 121 a first screw; 1211 first tapping thread; 1212 first fastening threads; 122 friction columns; 123 a second screw; 1231, tapping a second thread; 1232 a second fastening thread; 13 a head portion; 131 grooves; 2, a check bolt; 21 a third screw; 211 a third fastening thread; 3, a nut; 4, a locking cap; 41 a panel; 414 panel through-hole 414; 42 a hollow tube; 5, a plate member; 51 a first panel; 52 a second panel; 53 a bushing; 531 first internal threads; 532 second internal thread.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1-23, an anti-loosening, hot melt, self-tapping and bolt comprising: the screw 12 of the screw 1 is distributed from bottom to top, and comprises a pointed head 11, a first tapping thread 1211, a first fastening thread 1212, a friction column 122 and/or a second tapping thread 1231, a second fastening thread 1232, a groove 131 and a head 13; the screw 12 is composed of a first screw 121, a friction column 122 and a second screw 123 which are axially connected, a first tapping thread 1211 and a first fastening thread 1212 are distributed on the surface of the first screw 121, and a pointed end 11 is connected to one end of the first screw; a second fastening thread 1232 and/or a second tapping thread 1231 are distributed on the surface of the second screw 123, and one end of the second screw is connected with a head 13; a groove 131 is formed in the surface of one side, connected with the second screw 123, of the head 13; wherein, the first tapping threads 1211 and the first fastening threads 1212 have the same lead angle; the second tapping threads 1231 have the same lead angle as the second fastening threads 1232; the first fastening screw 1212 and the second fastening screw 1232 have different lead angles.

Specifically, the head 13 of the screw 1 is divided into: an inner driving mushroom head, an outer driving bidirectional flange head and an outer driving unidirectional flange head. The point 11 in the screw 1 is similar in effect and purpose to a hot melt drill bit. The tip 11 is used for high-speed friction heating and drilling on the surface of the plate 5, the contact part of the plate 5 and the tip 11 is processed into a panel through hole 414 in a hot melting state, and the tip 11 plays a role of a hot melting drill bit.

The cross section of the tip 11 and the first tapping threads 1211 of the first screw rod 121 is triangular-like, and the tip 11 and the first tapping threads 1211 of the first screw rod 121 are integrally in a cone-shaped structure. The first fastening thread 1212 portion in the first screw 121 and the second fastening thread 1232 portion in the second screw 123 are circular in cross-section. The first fastening screw 1212 of the first screw 121 and the second fastening screw 1232 of the second screw 123 are integrally formed in a cylindrical structure.

The point 11 in the screw 1 is used to drill the plate 5 and form the bushing 53. The bush 53 is raised up and down on the surface of the plate 5, and the portion of the bush 53 raised up enters the groove 131 of the head 13 of the screw 1. The first tapping threads 1211 tap the inner surface of the heat-fusible bush 53, and a first internal thread 531 is formed on the inner surface of the bush 53. The first fastening thread 1212 is used to continue tapping the inner surface of the bush 53 on the basis of the first tapping thread 1211 to form the first internal thread 531 of a sufficient number of lines (turns) and a sufficient coupling strength on the inner surface of the bush 53. The friction cylinder 122 is used to heat the inner surface of the bush 53 by rotation, and the inner surface of the bush 53 is kept in a hot-melt state. Meanwhile, during the downward movement of the screw 1, the friction cylinder 122 grinds the first internal thread 531 formed on the inner surface of the bushing 53 to provide a smooth surface for the second fastening thread 1232 to be tapped. When the second tapping threads 1231 are provided on the surface of the friction cylinder 122, the inner surface of the bushing 53 in the hot-melt state and the first internal threads 531 are directly tapped again by the second tapping threads 1231 on the inner surface of the bushing 53 in addition to the first internal threads 531. The second fastening screw 1232 continues to tap the inner surface of the bush 53 on the basis of the second tapping screw 1231 to form the second internal screw 532 of a sufficient number of lines (turns) and a sufficient coupling strength on the inner surface of the bush 53. After the first internal thread 531 on the inner surface of the bush 53 is tapped by the second fastening thread 1232, the first internal thread 531 is thermally melted and deformed, the thread line of the first internal thread 531 disappears, and only the second fastening thread 1232 and the second internal thread 532 are closely attached to each other in the area of the inner surface of the bush 53.

The first face of the tip 11 of the screw 1 in contact with the plate 5 is the first panel 51 and the second face 52 of the plate 5 overlapping the first panel 51. In the process of heating the first panel 51 in the plate 5 by the rotating friction of the pointed end 11 of the screw 1, the rotating friction time of the first panel 51 is prolonged, the heating time is prolonged, and the temperature of the inner surface or the whole of the lining 53 of the first panel 51 is improved. When the second fastening screw 1232 is engaged with the first panel 51, the inner surface of the bush 53 of the first panel 51 is in a heat-melted state.

In the whole process of connecting the screw 1 and the bushing 53, the inner surface of the bushing 53 is in a hot-melt state, and even though the first internal thread 531 is formed on the inner surface of the bushing 53, the inner surface of the plate 5 in the hot-melt state and the first internal thread 531 are subjected to thermoplastic deformation again through tapping again, so that second internal threads 532 with different thread angles are generated, and the plate is cooled and shaped after reaching a set shape.

After the connection is completed, the anti-loose connection is realized between the first fastening thread 1212 and the second fastening thread 1232 through lead angles of different angles. In this process, the inner surface of the liner 53 of the plate 5 needs to be in a hot-melting state, so that the threaded connection of the two thread angles can be completed. After the liner 53 is cooled, the effect of anti-loose connection is achieved. Generally, in the cooling state of the liner 53, it is difficult for the threads to simultaneously achieve axial connection of two thread angles on the inner surfaces of the same screw 12 and the same liner 53.

Specifically, after drilling the tip 11 in the screw 1, a hollow bush 53 with a panel through hole 414 protruding to both ends is formed on the first panel 51 and the second panel 52 of the plate 5. The first tapping threads 1211 tap the inner surface of the bushing 53 in a hot-melted state. After the tapping is completed, the inner surface of the bush 53 is pressed next to the first fastening screw 1212, and a first internal screw 531 is generated on the inner surface of the bush 53. The first fastening thread 1212 of the first screw 121 is tightly attached to the first internal thread 531. During the further downward rotation of the screw 1, the friction column 122 rotationally grinds the first internal thread 531 flat. During the rotational leveling process, the friction columns 122 frictionally heat the inner surface of the bushing 53 in a rotating manner, so that the inner surface of the bushing 53 is maintained in a hot-melt state.

Thereafter, when the first fastening screw 1212 presses the first female screw 531 into the inner surface of the bushing 53, and the second fastening screw 1232 is rotated downward by the self-tapping screw to contact the first female screw 531, the inner surface of the bushing 53, which contacts the second fastening screw 1232, of the plate 5 is in a hot-melt state, and is plastically deformed by the second fastening screw 1232. The second fastening screw 1232 presses the first screw and the inner surface of the bush 53 to be deformed, the second fastening screw 1232 embosses a second internal screw 532 on the inner surface of the heat-fused bush 53, and the second fastening screw 1232 is tightly coupled to the second internal screw 532. Alternatively, the friction cylinder 122 is provided with a second self-tapping screw on the surface thereof, and during the downward rotation of the screw 1, the second tapping screw 1231 taps the inner surface of the bushing 53 in a hot-melted state, and after the tapping is completed, the second fastening screw 1232 presses the inner surface of the bushing 53, thereby forming a second internal thread 532 on the inner surface of the bushing 53. The second fastening screw 1232 is tightly attached to the second internal screw 532. The angles of lead angles between the first fastening threads 1212 and the second fastening threads 1232 are different, with an angular difference between them. After the first fastening thread 1212 and the second fastening thread 1232 are connected and cooled with the inner surface of the bushing 53 by hot melting, the connection between the screw 1 and the plate 5 achieves the effects of looseness prevention and detachment prevention.

In order to achieve the effect of the anti-loose connection, the inner surface of the hollow bush 53 protruding from the surface of the plate 5 must include both the first fastening screw 1212 and the second fastening screw 1232, and the corresponding first internal screw 531 and second internal screw 532. Thus, it is necessary that the number of lines (turns) of the second fastening thread 1232 in the screw 1 is smaller than the number of lines (turns) of the first fastening thread 1212. After allowing the screw 1 to drill the plate 5 and to rotate downward, the first fastening screw 1212 and the second fastening screw 1232 can be simultaneously coupled into the bush 53 of the plate 5. And, at least two screws 1 are installed on the surface of the plate 5, so that the first panel 51 or the second panel 52 of the plate 5 can be prevented from rotating. The first panel 51 or the second panel 52 is prevented from being loosened from the first fastening screw 1212 or the second fastening screw 1232 alone.

Because the external thread and the internal thread with the same size and the same thread lead angle ascend or descend in the axial spiral rotation mode according to the same rotation track. When the sizes of the external thread and the internal thread are different or the thread lead angles are different, the screw can not axially and spirally rotate to rise or fall along the track. Similarly, two groups of external threads with different thread lead angles are distributed on the surface of the screw rod 12 of the same screw 1, and the two groups of external threads are combined with the inner surface of the plate 5 in a hot melting state. And after the plate is connected with the inner surface of the plate 5 in a hot melting way, two groups of internal threads with different thread lead angles are formed on the inner surface of the plate 5 in an embossing way. Because the rotation tracks between the external threads and the internal threads of two groups of different thread lead angles are different, the two groups of external threads and the internal threads cannot simultaneously spirally rotate to rise or fall. Therefore, the effect of mutual locking is realized between the threads of the two groups of thread lead angles, and the purpose of anti-loosening connection is achieved. Thus, the double-thread connection and locking between the screw 1 and the plate 5 are realized.

The angle of the lead angle of the first fastening thread 1212 is different from the angle of the lead angle of the second fastening thread 1232. The angle difference between the two is larger than the maximum deviation shaking angle of the external thread in the internal thread after the external thread is connected with the internal thread. Typically, the angle between the lead angles of the first fastening threads 1212 and the second fastening threads 1232 is between 1-90 degrees. The lead angle of the first fastening threads 1212 is smaller than the lead angle of the second fastening threads 1232. Alternatively, the lead angle of the first fastening threads 1212 is greater than the lead angle of the second fastening threads 1232. However, the angle of the lead angle of the first fastening thread 1212 is different from the number of angles of the lead angle of the second fastening thread 1232.

Wherein, when the friction column 122 is not provided with the self-tapping external thread, the second fastening thread 1232 is integrally provided with the external thread of the self-tapping structure. The inner surface of the plate 5 is pressed and rotated downward by the external thread of the self-tapping structure, and a first internal thread 531 is engraved on the inner surface of the plate 5. And, the second fastening screw 1232 is closely attached to the second internal screw 532.

When connecting, the first fastening screw thread 1212 and the second fastening screw thread 1232 are combined by using the same tooth type. Alternatively, the first fastening screw 1212 and the second fastening screw 1232 may be combined with each other in different tooth patterns. For example: the first fastening screw 1212 has fine threads and the second fastening screw 1232 has coarse threads.

To sum up, the threads of the two thread angles in the screw 1 and the screw 12 are connected with the inner surface of the liner 53 of the plate 5 in a hot melting and fusion manner, so that the anti-loose connection and the anti-dismantling connection are realized. Because the male screw thread with the same inclination angle (the same lead angle) is screwed up or down along the female screw thread with the same inclination angle (the same lead angle). If the inclination angles (lead angles of the threads are the same) of the external thread and the internal thread are different, the spiral ascending tracks are different, the external thread and the internal thread which are in different tracks are connected and cannot rotate spirally, and the external thread and the internal thread are in a locking state.

Like this, same screw rod 12 is equipped with the external screw thread of two kinds of inclination, and the external screw thread of two kinds of inclination passes through hot melt fusion mode and fixes with plate 5 bush 53 internal surface connection, treats bush 53 internal surface cooling back, carries out the close laminating connection with the external screw thread of two kinds of inclination at bush 53 internal surface. Because the helical curved tracks of the external threads at two inclined angles are different, the external threads on the surface of the screw 12 cannot axially screw up along the internal threads at different angles on the inner surface of the bush 53.

As shown in fig. 1, in some examples of the present invention, specifically, the forming process of the hot melt self-tapping is divided into six stages:

1. screw 1 setting phase

The drive means is moved downwards to pre-compact the plate 5 and the driver bit engages the screw 1 for the first positioning. Secondly, the conical tip 11 of the screw 1 is positioned with the first panel 51 of the plate 5, so as to ensure that the plate 5 does not slide or deform excessively in the subsequent process.

2. Penetration phase

The high-speed rotation friction between the conical tip 11 of the screw 1 and the first panel 51 of the plate 5 generates high temperature, the surface of the metal plate 5 in the area near the tip 11 of the screw 1 is rapidly softened, and holes are rapidly machined under high-speed rotation and axial pressure to penetrate the first panel 51 and the second panel 52 of the plate 5.

The screw 1 rotates at a speed greater than 6000 revolutions per minute. At this stage, the screw 1 and the plate 5 are both subjected to high temperature of 500-600 ℃, and the surface of the screw 1 is coated with a special coating, so that the screw is not affected by the high temperature. The entire phase continues until the screw 1 breaks the second panel 52 of the lower plate 5.

The panel 41 which the tip 11 of the screw 1 and the plate 5 first contact is a first panel 51, the second panel 52 is attached to the first panel 51, and the first panel 51 and the second panel 52 form the complete plate 5. The tip 11 of the screw 1 rotates at a high speed, and the heating time and the heating temperature of the tip 11 of the screw 1 to the first panel 51 are longer than those of the tip 11 of the screw 1 to the second panel 52. When the first panel 51 is connected to the second fastening screw 1232, the second fastening screw 1232 performs effective extrusion deformation and close fitting again on the internal thread (the first internal thread 531 formed on the inner surface of the bushing 53 by the first fastening screw 1212) already formed on the inner surface of the bushing 53 of the first panel 51, so as to form the second fastening screw 1232 and the second internal thread 532 which are fitted to each other.

3. Hole forming stage

When the screw 1 penetrates the plate 5 and the rotation speed decreases, the plate 5 is still in a softened state. The screw 1 continues to move downwards under the action of the axial downward pressure of the driving device, the contact area of the conical surface of the tip 11 of the screw 1 and the metal material of the plate 5 is increased, and the inner surface of the hot-melt metal plate 5 is subjected to thermoplastic flow in the radial direction and the axial direction under the action of axial feeding and rotating of the tip 11 to form a bushing 53 with a hollow tube 42 structure with two ends protruding outwards.

4. Thread forming stage

After the sheet metal member 5 is formed into the hollow bush 53, the first tapping threads 1211 provided under the screw 1 are started to perform the tapping operation, the rotational speed of the driving device is further reduced, and the first internal threads 531 are tapped from the first tapping threads 1211 and the first fastening threads 1212 provided on the inner surface of the hollow bush 53 which is gradually cooled.

During the downward movement, past the friction post 122. The friction cylinder 122 grinds and flattens the first female screw 531 formed on the inner surface of the bushing 53 of the plate 5 by the first fastening screw 1212. And, the friction column 122 ensures the inner surface of the bush 53 of the plate 5 to be in a hot-melted state during the rotational friction. Continuing to rotate downwardly, the second fastening thread 1232 taps a second internal thread 532 on the flattened, hot-melt internal surface of the liner 53 of the plate 5 via the second tapping thread 1231 or directly using the second fastening thread 1232 of the self-tapping thread form on the flattened, hot-melt internal surface of the liner 53 of the plate 5.

Wherein the angles of the lead angles of the first and second internal threads 531, 532 that the first and second fastening threads 1212, 1232 tap on the inner surface of the bushing 53 are different. However, the first fastening thread 1212 and the first internal thread 531; the second fastening threads 1232 have the same lead angle as the second internal threads 532.

5. Stage of screwing in screw

After the second fastening thread 1232 is completely screwed into the plate 5 and the head 13 of the screw 1 is contacted and connected with the first panel 51 of the plate 5, the screw 1 is screwed with the plate 5. At this point, the screw 1 has been substantially screwed into the tapped hole.

6. Tightening phase

The head 13 of the screw 1 comes into contact with the first panel 51 in the sheet metal element 5, creating friction. And setting a tightening torque according to the driving device, and tightening the screw 1 to the set torque to complete the connection of the screw 1 and the plate 5.

As shown in fig. 2-6, in some examples of the invention, when the first shank 121 of shank 12 in screw 1 has a smaller diameter than the second shank 123.

The first fastening thread 1212 diameter of the surface of the first screw 121 is smaller than the second fastening thread 1232 diameter in the second screw 123. Also, the lead angle of the first fastening screw 1212 is smaller than the lead angle of the second fastening screw 1232. The first fastening screw 1212 and the second fastening screw 1232 have the same rotation direction. The side surface of the friction column 122 connected with the first screw rod 121 and the second screw rod 123 is a trapezoidal truncated cone, and the upper surface and the lower surface of the truncated cone are respectively the same as the diameters of the first screw rod 121 and the second screw rod 123.

In use, the screw 1 is rotated at high speed by the point 11 to rub and drill a hole in the surface of the first panel 51 of the plate 5, tapping the hot melted inner surface of the bush 53 by the first tapping thread 1211. Continuing to rotate downward, the first fastening thread 1212 of the first screw 121 is closely fitted and fastened to the thermally fused inner surface of the bushing 53 of the plate 5. During the downward movement, the friction cylinder 122 applies rotational friction heating to the first internal thread 531 formed by the first fastening thread 1212 on the inner surface of the bushing 53 of the plate 5, so that the inner surface of the bushing 53 of the plate 5 is maintained in a hot-melted state. At the same time, the friction column 122 grinds the first internal thread 531 flat. The second internal thread 532 is pressed on the inner surface of the flattened bushing 53 through the second fastening thread 1232 of the second screw 123, and the second fastening thread 1232 is tightly attached to and fastened with the second internal thread 532 on the inner surface of the flattened bushing 53. In the bushing 53 of the plate 5, the inner diameter of the second female screw 532 facing through hole 414 is larger than the inner diameter of the first female screw 531 facing through hole 414.

As shown in fig. 7, in some examples of the invention, when the first shank 121 of the shank 12 in the screw 1 has a smaller diameter than the second shank 123.

When the second fastening screw 1232 is formed by thread rolling or pressing or cutting the second screw 123, the degree of thread rolling or pressing or cutting of the second screw 123 is increased. After the second fastening screw 1232 is machined, the diameter of the first screw 121 is the same as that of the second screw 123, and the diameter and the thread height of the second fastening screw 1232 are greater than those of the first fastening screw 1212. Meanwhile, the diameter of the friction column 122 is larger than or equal to the diameter of the first screw 121 and smaller than the diameter of the second fastening thread 1232.

As shown in fig. 8-9, in some examples of the invention, the first and second screws 121, 123 of the screws 12 in the screw 1 are the same diameter.

The first fastening screw 1212 and the second fastening screw 1232 have the same diameter. The diameter of the friction column 122 is smaller than the diameters of the first fastening screw 1212 and the second fastening screw 1232 and larger than the diameters of the first screw 121 and the second screw 123.

Also, the lead angle of the first fastening threads 1212 is smaller than the lead angle of the second fastening threads 1232. The first fastening screw 1212 and the second fastening screw 1232 have the same rotation direction.

In use, the screw 1 is drilled and connected on the surface of the first panel 51 of the plate 5 through the pointed end 11, and the first fastening thread 1212 of the first screw 121 is drilled and tightly attached and fastened with the inner surface of the bushing 53 of the plate 5 through the pointed end 11. During the downward movement, the friction cylinder 122 applies rotational friction heating to the first internal thread 531 formed by the first fastening thread 1212 on the inner surface of the bushing 53 of the plate 5, so that the inner surface of the bushing 53 of the plate 5 is maintained in a hot-melted state. At the same time, the friction column 122 grinds the first internal thread 531 flat. The inner surface of the bushing 53 of the hot-melt plate 5 is provided with a second fastening thread 1232 with a thread self-tapping structure, a second internal thread 532 is pressed on the inner surface of the ground bushing 53 through thread self-tapping, and the second fastening thread 1232 is tightly attached to and fastened with the second internal thread 532.

As shown in fig. 10, in some examples of the invention, the friction post 122 is provided with a second tap thread 1231 on its outer surface.

The inner surface of the bushing 53 is tapped by the second tapping thread 1231, so that the second fastening thread 1232 is preferably embedded into the hot-melted inner surface of the bushing 53 of the plate 5 to form a closely fitted threaded connection. The diameter of the second tap thread 1231 is equal to or smaller than the diameter of the second fastening thread 1232. When the second threading 1231 is used on the surface of the friction cylinder 122, the second fastening thread 1232 may not be a self-tapping thread.

As shown in fig. 11, in some examples of the invention, the lead angle of the first fastening threads 1212 is smaller than the lead angle of the second fastening threads 1232. Alternatively, the lead angle of the first fastening threads 1212 is greater than the lead angle of the second fastening threads 1232. The first tapping thread 1211, the first fastening thread 1212 and the second fastening thread 1232 are integrally machined by thread rolling, pressing or cutting, so that a continuous and complete thread with varied thread is formed on the surfaces of the first screw rod 121 and the second screw rod 123 of the screw 1. The modified threads include a first tapping thread 1211, a first fastening thread 1212, a second tapping thread 1231, and a second fastening thread 1232. Alternatively, the modified threads include a first tapping thread 1211, a first fastening thread 1212, and a second fastening thread 1232 (in this case, the second fastening thread 1232 is a thread having a self-tapping structure). Also, the angle that ensures the lead angle between the first fastening screw 1212 and the second fastening screw 1232 is not the same.

Wherein the lead angles of the first tapping threads 1211 and the first fastening threads 1212 are the same. The lead angles of the first tapping threads 1211 and the first fastening threads 1212 are different from the lead angle of the second fastening threads 1232. However, the thread pitches of the first tapping threads 1211 and the first fastening threads 1212, or the second fastening threads 1232, are the same. The modified thread performs a threaded modified connection only between the first fastening thread 1212 and the second fastening thread 1232.

Or, the thread profile in the screw 12 is the same, the thread pitch is gradually increased, and a complete variable-thread is continuously processed.

As shown in fig. 12, in some examples of the present invention, the first fastening screw 1212 has fine threads and the second fastening screw 1232 has coarse threads.

When guaranteeing second fastening screw 1232 joint strength, reduce the number of lines (the number of turns) of second fastening screw 1232, practice thrift the space that second fastening screw 1232 took second screw 123. Likewise, there is an angular difference between the lead angle of the first fastening thread 1212 and the lead angle of the second fastening thread 1232. Generally, the lead angle of the first fastening threads 1212 is smaller than the lead angle of the second fastening threads 1232.

As shown in fig. 13, in some examples of the invention, when the first fastening thread 1212 is a self-tapping thread.

The pointed end 11 of the screw 1 and the plate 5 rotate and rub at a high speed and move downwards, and the surface of the plate 5 is subjected to hot melting and softening, and then is subjected to hole opening and connection. After the opening, a raised bushing 53 is formed. The first fastening thread 1212 is directly self-tapping coupled to the thermally fused inner surface of the bushing 53 of the plate 5 by means of the thread of the self-tapping structure. The friction column 122 is provided with a self-tapping thread structure of a second tapping thread 1231 on the surface thereof, and the second fastening thread 1232 has a triangular thread shape. The second tapping thread 1231 on the surface of the friction column 122 taps the inner surface of the bushing 53 of the plate 5 and then rotates downwards, the second fastening thread 1232 taps the inner surface of the bushing 53 of the plate 5 to form a second internal thread 532, and the second fastening thread 1232 is tightly attached to the second internal thread 532. In this connection, the lead angle of the first fastening thread 1212 is larger than that of the second fastening thread 1232. Wherein the first fastening screw 1212 and the second fastening screw 1232 have the same diameter.

As shown in fig. 14, in some examples of the invention, the screw 1 is used in conjunction with hot-melt drilling technology.

The screw 12 of the screw 1 is distributed from bottom to top, and comprises a first tapping thread 1211, a first fastening thread 1212, a friction column 122, a second fastening thread 1232, a groove 131 and a head 13;

the screw 12 is composed of a first screw 121, a friction column 122 and a second screw 123 which are axially connected, and a first tapping thread 1211 and a first fastening thread 1212 are distributed on the surface of the first screw 121; a second fastening thread 1232 and/or a second tapping thread 1231 are distributed on the surface of the second screw 123, and one end of the second screw is connected with a head 13; a groove 131 is formed at one side of the head 13 connected with the second screw 123;

wherein the lead angle of the first tapping threads 1211 is the same as that of the first fastening threads 1212; the lead angles of the second tapping threads 1231 and the second fastening threads 1232 are the same; the first fastening thread 1212 and the second tapping thread 1231 have different numbers of lead angles.

When the hot-melt drilling technology is used, the surface of the plate 5 is subjected to high-speed rotary friction through a hot-melt drilling bit. The surface of the plate 5 softened by the friction and the drill exerted an axial force, the plate 5 creating a raised bushing 53 with a panel through hole 414. The screw 1 is screwed down into the bush 53, and the first tapping thread 1211, the first fastening thread 1212, and the second fastening thread 1232 are pressed against the thermally fused inner surface of the bush 53 of the plate 5, forming the first internal thread 531 and the second internal thread 532. The first tapping threads 1211, the first fastening threads 1212 and the second fastening threads 1232 are tightly and tightly connected and locked with the first internal threads 531 and the second internal threads 532 on the inner surface of the bushing 53. And, the anti-loose locking connection between the screw 1 and the plate 5 is realized by the lead angle of the different thread angles between the first fastening thread 1212 and the second fastening thread 1232.

As shown in fig. 15 to 18, in some examples of the present invention, the screw 1 may be combined with a bolt instead of being connected to the plate 5 alone, so that the bolt becomes the check bolt 2.

The anti-loosening bolt 2 is provided with a pointed end 11, a first screw 121, a friction column 122, a second screw 123, a third screw 21 and a head 13 from top to bottom. The surface of the first screw rod 121 is provided with a first fastening thread 1212, the surface of the second screw rod 123 is provided with a second fastening thread 1232, and the surface of the third screw rod 21 is provided with a third fastening thread 211.

The tip 11, the first screw 121, the friction column 122 and the second screw 123 form the screw 1. The third screw 21 and the head 13 constitute a bolt. The bolt 1 and the bolt form a locking bolt 2. The diameters of the first screw rod 121 and the second screw rod 123 in the screw 1 are smaller than the diameter of the third screw rod 21.

The third fastening thread 211 in the third screw 21 is connected and fastened with the nut 3, and the screw 1 is connected and fastened with the locking cap 4. The locking cap 4 is composed of a polygonal panel 41, or the polygonal panel 41 is connected with a polygonal hollow tube 42. For example, the locking cap 4 is a hexagonal panel 41, or the panel 41 and the hollow tube 42 are combined into the locking cap 4.

After the anti-loose bolt 2 is connected and fastened with the nut 3, the anti-loose cap 4 is connected with the screw 1 through the driving device. The driving device drives the anti-loosening cap 4 to rotate at a high speed, and the panel 41 at one end of the anti-loosening cap 4 and the sharp head 11 rotate at a high speed to generate heat through friction. The panel 41 of the locking cap 4 is thermally deformed, creating a bush 53 which is convex and has a panel through hole 414. The thermally fused inner surface of the bush 53 is coupled with the first tapping thread 1211, the first fastening thread 1212 and the second fastening thread 1232, and the first female thread 531 and the second female thread 532 are generated on the surface of the panel 41 of the locking cap 4. The first internal thread 531 and the second internal thread 532 are tightly attached, connected and fastened with the first fastening thread 1212 and the second fastening thread 1232, respectively. And, the edge of the other end of the hollow tube 42 of the locking cap 4 is tightly pressed on the surface of the nut 3, so that the nut 3 is prevented from rotating and rising to be loosened, and the locking connection effect between the locking cap 4 and the nut 3 is realized. Meanwhile, the first fastening thread 1212 and the second fastening thread 1232 have different thread lead angles, and the first fastening thread 1212 and the second fastening thread 1232 are connected in a loose-proof manner through an angle difference, so that the loose-proof connection between the loose-proof cap 4 and the third screw 21 in the loose-proof bolt 2 is realized. In this way, the locking cap 4 is integrally connected with the locking bolt 2 and the nut 3 in a locking way.

As shown in fig. 19 to 23, in some examples of the present invention, the anti-loose bolt 2 is composed of a friction column 122, a third screw 21 and a head 13 from top to bottom, and a third fastening thread 211 is distributed on the surface of the third screw 21.

The friction column 122 has a trapezoidal truncated cone or cone structure on the side. The friction cylinder 122 has a diameter smaller than the diameter of the third fastening screw 12.

The locking cap 4 is composed of a panel 41 and a hollow tube 42, one end of the polygonal hollow tube 42 is connected with the panel 41, and the surface of the panel 41 is provided with a panel through hole 414. The inner diameter of the panel through hole 414 is larger than the diameter of the head 13 of the friction column 122 with a cone structure and smaller than the whole diameter of the friction column 122, and the panel through hole 414 on the surface of the panel 41 is connected with the head 13 of the friction column 122 in a sleeved mode. This is favorable to friction post 122 and the panel through-hole 414 inner wall of locking cap 4 panel 41 to carry out high-speed rotatory friction, and after the hot melt fuses, reaches the effect of friction welding.

Or, the locking cap 4 is a polygonal hollow tube 42, the inner surface of the polygonal hollow tube 42 is a cylindrical, truncated cone or conical panel through hole 414, and the inner diameter of the panel through hole 414 of the hollow tube 42 is entirely smaller than the size of the friction column 122.

After the nut 3 is tightly connected with the third fastening thread 211 in the third screw 21 of the check bolt 2, the panel through hole 414 of the check cap 4 is sleeved on the upper half part of the friction column 122 in the check bolt 2. And, through the high-speed rotation of the driving device, the side wall of the through hole 414 of the panel of the locking cap 4 and the outer surface of the friction column 122 are subjected to high-speed rotation friction, and the friction generates heat, so that the side wall of the through hole 414 of the panel of the locking cap 4 is melted by heat. The inner surface of the anti-loosening cap 4 melted by hot melting is tightly connected with the inner wall of the through hole 414 of the panel of the anti-loosening cap 4 and the friction column 122 in a friction welding mode by applying downward pressure to the anti-loosening cap 4. Meanwhile, the edge of one end of the polygonal cylinder of the anti-loosening cap 4 is tightly pressed on the surface of the nut 3 through downward pressure, so that the nut 3 is prevented from rotating and rising, and the anti-loosening effect is achieved.

Claims (7)

1. Locking hot melt self-tapping and bolt, characterized by includes: the screw rod (12) of the screw (1) is distributed from bottom to top, and the pointed end (11), the first tapping thread (1211), the first fastening thread (1212), the friction column (122) and/or the second tapping thread (1231), the second fastening thread (1232), the groove (131) and the head (13) are/is arranged on the screw rod;

the screw (12) is formed by axially connecting a first screw (121), the friction column (122) and a second screw (123), the surface of the first screw (121) is distributed with a first tapping thread (1211) and a first fastening thread (1212), and one end of the first screw is connected with the pointed end (11); the second fastening threads (1232) and/or the second tapping threads (1231) are distributed on the surface of the second screw (123), and one end of the second screw is connected with the head (13); the groove (131) is formed in the surface of one side, connected with the second screw (123), of the head (13);

wherein the first tapping thread (1211) has the same angle of lead angle as the first fastening thread (1212); the second threading (1231) and the second fastening thread (1232) have a lead angle of the same angle; the first fastening thread (1212) and the second fastening thread (1232) have lead angles that are not the same.

2. The anti-loosening hot melt self-threading and bolt set forth in claim 1 further comprising:

the anti-loosening bolt (2) consists of the pointed end (11), the first screw (121), the friction column (122), the second screw (123), the third screw (21), the head (13), the nut (3) and an anti-loosening cap (4);

the surface of the first screw rod (121) is provided with the first fastening thread (1212), the surface of the second screw rod (123) is provided with the second fastening thread (1232), and the surface of the third screw rod (21) is provided with the third fastening thread (211).

3. The anti-loosening hot melt self-threading and bolt set forth in claim 1 further comprising:

check bolt (2) from top to bottom, by friction post (122) third screw rod (21) head (13) nut (3) locking cap (4) are constituteed, third screw rod (21) surface distribution has third fastening screw thread (211).

4. The anti-loosening hot melt self-threading and bolt of claim 1 comprising:

the plate (5) consists of a first panel (51) and a second panel (52), the first contact surface of the tip (11) of the screw (1) and the plate (5) is the first panel (51), and the second panel (52) is the plate (5) overlapped with the first panel (51);

in the plate (5), the rotating friction time and the heating temperature of the tip (11) of the screw (1) to the first panel (51) are greater than those of the second panel (52).

5. The anti-loosening hot melt self-threading and bolt of claim 1 comprising:

when the second fastening threads (1232) are in contact with the inner surface of the plate (5), the inner surface of the plate (5) is in a hot melting state, and plastic deformation is performed through the second fastening threads (1232).

6. The anti-loosening hot melt self-threading and bolt of claim 1 comprising:

the friction column (122) is a triangular cylinder or a truncated cone with a trapezoidal side face;

the outer surface of the friction column (122) is provided with the second tapping threads (1231), and the diameter of the second tapping threads (1231) is smaller than or equal to that of the second fastening threads (1232).

7. The anti-loosening hot melt self-threading and bolt set forth in claim 1 further comprising:

the thread profiles of the first fastening thread (1212) and the second fastening thread (1232) are different; alternatively, the thread profile of the first fastening thread (1212) is the same as the thread profile of the second fastening thread (1232).

Images