A shear-type threaded pull pin and method of installing the same

Abstract

The application discloses a kind of anti-shearing thread thread pull and its installation method, anti-shearing thread thread pull includes core pole and from bottom to top in order to be set on the core pole and nail body, nail body has from top to bottom and is penetrated into inner thread hole and through hole, wherein the thread length of inner thread hole is 3-5 turns, the major diameter of the thread of inner thread hole is equal with the diameter of through hole;The middle part of core pole has neck break groove, and the top end of core pole and neck break groove are upper thread section, and the bottom end of core pole and neck break groove are upper and lower link lower thread section and light pole section, and upper thread section and lower thread section are adapted with inner thread hole, wherein the thread length of lower thread section is 1-5 turns, and the diameter of light pole section is equal with the major diameter of inner thread hole.The application can improve the anti-shearing performance of thread thread pull and the quality consistency after installation.

Description

Technical Field

[0001] This invention relates to the field of fastener technology, specifically to a shear-resistant threaded pull pin and its installation method. Background Technology

[0002] In modern aerospace, the connecting parts of aircraft, such as the fuselage and wing skin, are typically compact and enclosed, significantly limiting the application of traditional bolts and nuts that require double-sided mounting. Therefore, fasteners that can be mounted on one side are increasingly used in aircraft.

[0003] Threaded pull studs, as a typical single-sided mounting fastener, have advantages such as compact structure, light weight, installation on a 7° inclined plane, and a flat core rod cross-section after installation. Their application is now relatively mature and widespread.

[0004] In existing threaded snap fastener products, the snap body and the core rod are connected using a fully threaded connection. However, in actual installation, the fully threaded connection presents the following technical problems:

[0005] 1) The friction generated by the threaded fit during installation is relatively large, which can easily lead to abnormal situations such as thread interference and jamming. This can cause problems such as abnormal bulging of the threaded pins after installation and poor installation consistency, affecting product quality and reliability.

[0006] 2) The shear resistance of threaded pull studs is a crucial indicator of their performance. The shear resistance of pull studs is closely related to the minor diameter of the thread on the mandrel. Under the same outer diameter conditions, the shear resistance of a threaded mandrel is significantly lower than that of a smooth mandrel. Existing threaded pull studs employ a fully threaded mandrel structure, which to some extent reduces the shear resistance of the mandrel itself and limits the load-bearing capacity of the product.

[0007] Therefore, providing a shear-resistant threaded pull pin and its installation method is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0008] In view of this, the present invention provides a shear-resistant threaded pull stud and its installation method to improve the shear resistance of the threaded pull stud and the consistency of its quality after installation.

[0009] To achieve the above objectives, the present invention adopts the following technical solution: A shear-resistant threaded pull pin includes a core rod and a pin sleeve and a pin body sequentially sleeved on the core rod from bottom to top. The pin body has an internally threaded hole and a through hole that run from top to bottom. The internally threaded hole has a thread length of 3-5 turns, and the major diameter of the internally threaded hole is equal to the diameter of the through hole. The core rod has a necking groove in the middle. The top end of the core rod and the necking groove form an upper threaded section. The bottom end of the core rod and the necking groove form a lower threaded section and a smooth section that connect vertically. Both the upper threaded section and the lower threaded section are adapted to the internally threaded hole. The lower threaded section has a thread length of 1-5 turns, and the diameter of the smooth section is equal to the major diameter of the internally threaded hole.

[0010] By adopting the above technical solutions, the beneficial effects of the present invention are as follows: By limiting the length of the internal threaded hole of the nail to 3-5 turns and the length of the lower threaded section of the mandrel to 1-5 turns, while setting the diameter of the polished section of the mandrel to be equal to the major diameter of the internal threaded hole, on the one hand, the thread fit length between the nail body and the mandrel is shortened, reducing the thread engagement friction resistance and interference during installation and improving the installation success rate; on the other hand, increasing the diameter of the polished section of the mandrel to the major diameter of the thread effectively increases the shear resistance area of ​​the mandrel, significantly improving the shear resistance of the threaded pull nail; in addition, when the polished section of the mandrel runs to the internal threaded hole of the nail, the equal diameter forms a mechanical limit, which precisely controls the upward running distance of the mandrel, ensuring the uniformity of the flatness of the mandrel cross-section after installation.

[0011] Furthermore, it also includes a drive nut, which is screwed onto the upper threaded section and contacts the limiting platform at the top of the nail body.

[0012] The beneficial effects of adopting the above-mentioned further technical solution are that by setting a drive nut, the threaded pin can be adapted to a conventional rotary mounting gun, and installation can be completed without special equipment, thereby reducing the cost of use and improving the versatility and applicability of the product.

[0013] Furthermore, the top two sides of the upper threaded section are provided with a wrench platform.

[0014] The beneficial effects of adopting the above-mentioned further technical solution are that the setting of the wrench platform facilitates the stable cooperation between the installation gun and the top of the core rod, prevents relative slippage during installation, and improves the reliability of installation and the convenience of operation.

[0015] Furthermore, the nail sleeve includes a nail sleeve body and a friction-reducing ring. The nail sleeve body is sleeved on the smooth rod section, and the top of the nail sleeve body has a stepped hole. The friction-reducing ring is placed in the stepped hole, and the guide cone at the bottom of the nail body is inserted into the stepped hole and contacts the friction-reducing ring.

[0016] The beneficial effect of adopting the above-mentioned further technical solution is that by setting a friction-reducing ring in the stepped hole of the nail sleeve body and forming contact between the nail body guide cone and the nail sleeve, the friction-reducing ring can effectively reduce the frictional resistance of the nail sleeve during the sliding expansion process along the nail body guide cone, making the deformation of the nail sleeve more uniform and smooth, avoiding jamming or uneven deformation caused by excessive friction, thereby improving the installation quality and the stability of bulge formation.

[0017] Furthermore, the head protrusion of the nail sleeve near the core rod has a constriction to press the position; the outer side of the nail body has multiple circumferentially evenly arranged indentations corresponding to the position of the internal threaded hole.

[0018] The beneficial effects of adopting the above-mentioned further technical solutions are as follows: the constriction structure of the nail sleeve increases the interference fit between the nail sleeve and the core rod, preventing the nail sleeve from falling off before installation, and enhancing the connection reliability between the nail sleeve and the core rod after installation. After the nail sleeve is deformed during installation, it can more easily form an inverted bell-shaped bulge. The multiple circumferentially evenly distributed indentations on the outside of the nail body cause local plastic deformation of the nail body through the indentations, resulting in interference fit between the internal threaded hole and the core rod thread, which significantly enhances the locking performance between the nail body and the core rod and effectively prevents loosening problems under dynamic loads such as vibration.

[0019] Furthermore, the nail sleeve body is made of any one of stainless steel, aluminum alloy, and titanium alloy; the core rod is made of high-temperature alloy or titanium alloy; the nail body is made of titanium alloy or high-temperature alloy; the drive nut is made of carbon steel; and the friction-reducing ring is made of polyoxymethylene.

[0020] The beneficial effects of adopting the above-mentioned further technical solutions are as follows: by optimizing the selection of materials for each part, the nail sleeve body is made of stainless steel, aluminum alloy, or titanium alloy, which has good plasticity and corrosion resistance, and is easy to install and deform; the core rod and nail body are made of high-temperature alloy or titanium alloy, which has high strength and high toughness, ensuring the load-bearing capacity and shear resistance of the nail; the drive nut is made of carbon steel, which is inexpensive and has sufficient strength; the friction-reducing ring is made of polyoxymethylene, which has excellent self-lubricating and wear-resistant properties, and can maintain low friction characteristics for a long time, ensuring the stability of the installation process and the service life of the product.

[0021] An installation method for a shear-resistant threaded pull pin as described above includes the following steps: Align the top of the mandrel with the mounting gun and insert it. Then, the mounting gun places the shear-resistant threaded pin into the mounting hole of the mounting plate. The mounting gun is activated, driving the mandrel upward. The pin sleeve fitted on the mandrel moves upward accordingly, expanding and deforming upward along the guide cone of the pin body to form an upsetting head on the mounting plate. When the smooth section of the mandrel reaches the internal threaded hole, since the diameter of the smooth section is equal to the major diameter of the internal threaded hole, it hinders the mandrel from continuing to move upward. Under the drive of the mounting gun, the frictional resistance between the mandrel and the internal threaded hole is greater than the breaking force at the neck groove of the mandrel. The mandrel breaks at the neck groove, and the installation is completed.

[0022] By adopting the above technical solutions, the beneficial effects of the present invention are as follows: This installation method utilizes the equal diameter of the smooth section of the core rod and the threaded hole inside the nail body to create a mechanical limit, allowing the core rod to automatically stop at a preset position during installation. This eliminates the need for torque control, ensuring the flatness of the core rod cross-section and significantly improving the consistency of installation quality. Simultaneously, the short thread fit between the nail body and the core rod results in low frictional resistance during installation, effectively preventing thread interference, jamming, and other abnormalities, thus increasing the installation success rate. Furthermore, this method is simple to operate, requires minimal installation gun specifications, and is easily applicable in mass production. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0024] Figure 1 The attached figure is a three-dimensional structural schematic diagram of a shear-resistant threaded pull pin according to Embodiment 1; Figure 2 The attached figure is an exploded view of a shear-resistant threaded puller according to Embodiment 1; Figure 3 The attached figure is a cross-sectional view of a shear-resistant threaded pull pin according to Embodiment 1; Figure 4 The attached figure is a three-dimensional structural schematic diagram of a shear-resistant threaded pull pin according to Embodiment 2; Figure 5 The attached figure is an exploded view of a shear-resistant threaded puller according to Embodiment 2; Figure 6 The attached figure is a cross-sectional view of a shear-resistant threaded puller according to Embodiment 2; Figure 7 The attached figure is a cross-sectional view of the nail body provided by the present invention; Figure 8 The attached figure is a front view of the shear-resistant threaded pull pin provided by the present invention after installation; Figure 9 The attached image is... Figure 8 Sectional view of AA. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Example 1: like Figure 1-3 As shown in Figures 7-9, this embodiment of the invention discloses a shear-resistant threaded pin, comprising a core rod 1 and a pin sleeve 2 and a pin body 3 sequentially sleeved on the core rod 1 from bottom to top. The pin body 3 has an internal threaded hole 31 and a through hole 32 that pass through from top to bottom. The thread length of the internal threaded hole 31 is 3-5 turns, that is, the length of the internal threaded hole 31 accounts for a very small part of the total length of the pin body 3, and the rest is the through hole 32. The major diameter of the internal threaded hole 31 is equal to the diameter of the through hole 32. The core rod 1 has a necking groove 11 in the middle. The top end of the core rod 1 and the necking groove 11 are connected by an upper threaded section 12. The bottom end of the core rod 1 and the necking groove 11 are connected by a lower threaded section 13 and a smooth section 14. Both the upper threaded section 12 and the lower threaded section 13 are adapted to the internal threaded hole 31. The thread length of the lower threaded section 13 is 1-5 turns, and the diameter of the smooth section 14 is equal to the major diameter of the internal threaded hole 31. This invention limits the length of the internal threaded hole 31 of the nail body 3 to 3-5 turns and the length of the lower threaded section 13 of the core rod 1 to 1-5 turns. Simultaneously, the diameter of the smooth section 14 of the core rod 1 is set to be equal to the major diameter of the internal threaded hole 31. On one hand, this shortens the threaded engagement length between the nail body 3 and the core rod 1, reducing thread engagement friction and interference during installation and improving the installation success rate. On the other hand, increasing the diameter of the smooth section 14 of the core rod 1 to the major diameter of the thread effectively increases the shear resistance area of ​​the core rod 1, significantly improving the shear resistance of the threaded pull nail. Furthermore, when the smooth section 14 of the core rod 1 reaches the internal threaded hole 31 of the nail body 3, the equal diameter forms a mechanical limit, precisely controlling the upward movement distance of the core rod 1 and ensuring the uniformity of the flatness of the core rod 1's cross-section after installation.

[0027] To further optimize the technical solution of the present invention, a wrenching platform 121 is provided on both sides of the top of the upper thread section 12, which facilitates the stable engagement between the installation gun and the top of the core rod 1, prevents relative sliding during installation, and improves the reliability of installation and the convenience of operation.

[0028] Specifically, the nail sleeve 2 includes a nail sleeve body 21 and a friction-reducing ring 22. The nail sleeve body 21 is fitted onto the smooth rod section 14, and the top of the nail sleeve body 21 has a stepped hole. The friction-reducing ring 22 is placed in the stepped hole, and the guide cone 33 at the bottom of the nail body 3 is inserted into the stepped hole and contacts the friction-reducing ring 22. The friction-reducing ring 22 can effectively reduce the frictional resistance of the nail sleeve 2 during the sliding expansion process along the guide cone 33 of the nail body 3, making the deformation of the nail sleeve 2 more uniform and smooth, avoiding jamming or uneven deformation caused by excessive friction, thereby improving the installation quality and the stability of the bulge formation.

[0029] To further optimize the technical solution of the present invention, the nail sleeve 2 has a constriction 211 at the head boss 15 near the core rod 1 to press the position; the outer side of the nail body 3 has multiple circumferentially evenly arranged pressure dimples 34 corresponding to the position of the internal thread hole 31. The constriction 211 of the nail sleeve 2 increases the interference fit between the nail sleeve 2 and the core rod 1, prevents the nail sleeve 2 from falling off before installation, and enhances the connection reliability between the nail sleeve 2 and the core rod 1 after installation. After the nail sleeve 2 is deformed during installation, it can more easily form an inverted bell-shaped bulge; the multiple circumferentially evenly arranged pressure dimples 34 on the outer side of the nail body 3 cause local plastic deformation of the nail body 3 through the pressure dimples 34, resulting in interference fit between the internal thread hole 31 and the thread of the core rod 1, which significantly enhances the locking performance between the nail body 3 and the core rod 1 and effectively prevents loosening problems under dynamic loads such as vibration.

[0030] Specifically, the nail sleeve body 21 is made of stainless steel, aluminum alloy, or titanium alloy. The stainless steel is specifically 0Cr18Ni9Ti (304), the aluminum alloy is specifically 5056, and the titanium alloy is specifically CP-Ti (TA1). The core rod 1 is made of high-temperature alloy or titanium alloy. The high-temperature alloy is specifically GH2132 (A286), GH4169, or GH2132, and the titanium alloy is specifically Ti6Al4V (TC4). The nail body 3 is made of titanium alloy or high-temperature alloy. The titanium alloy is specifically Ti6Al4V (TC4) or Ti38644 (TB9), and the high-temperature alloy is specifically GH4169 or GH2132. The friction-reducing ring 22 is made of polyoxymethylene. By optimizing the selection of materials for each component, the nail sleeve body 21 is made of stainless steel, aluminum alloy, or titanium alloy, which has good plasticity and corrosion resistance, and is easy to install and deform; the core rod 1 and nail body 3 are made of high-temperature alloy or titanium alloy, which has high strength and high toughness, ensuring the load-bearing capacity and shear resistance of the nail; the friction-reducing ring 22 is made of polyoxymethylene, which has excellent self-lubricating and wear-resistant properties, and can maintain low friction characteristics for a long time, ensuring the stability of the installation process and the service life of the product.

[0031] This invention also discloses an installation method for the shear-resistant threaded pull pin as described above, comprising the following steps: Align the top of the core rod 1 with the mounting gun and insert it. The mounting gun is a rotary-pull type. Then, the mounting gun places the shear-resistant threaded pin into the mounting hole of the mounting plate 4. The mounting gun is activated, driving the core rod 1 to move upward (the rotary-pull type mounting gun rotates and pulls the core rod 1 upward). The pin sleeve 2, which is fitted on the core rod 1, moves upward accordingly and expands and deforms upward along the guide cone 33 of the pin body 3, forming an upsetting head on the mounting plate 4. When the smooth section 14 of the core rod 1 reaches the internal threaded hole 31, since the diameter of the smooth section 14 is equal to the major diameter of the internal threaded hole 31, it hinders the core rod 1 from moving upward. Under the drive of the mounting gun, the frictional resistance between the core rod 1 and the internal threaded hole 31 is greater than the breaking force at the neck groove 11 of the core rod 1. The core rod 1 breaks at the neck groove 11, and the installation is completed.

[0032] This invention utilizes the fact that the diameter of the smooth section 14 of the core rod 1 is equal to the diameter of the threaded hole 31 in the nail body 3 to form a mechanical limit, so that the core rod 1 automatically stops at a preset position during installation. This ensures the flatness of the cross-section of the core rod 1 without relying on torque control, significantly improving the consistency of installation quality. At the same time, because the threaded engagement length between the nail body 3 and the core rod 1 is short, the frictional resistance during installation is small, effectively avoiding abnormal situations such as thread interference and jamming, and improving the installation success rate. In addition, this method is simple to operate, has low requirements for the installation gun, and is easy to promote and apply in mass production.

[0033] Example 2: like Figure 4-9As shown, this embodiment of the invention discloses a shear-resistant threaded pull pin, including a core rod 1 and a pin sleeve 2 and a pin body 3 sequentially sleeved on the core rod 1 from bottom to top, and a drive nut 5. The pin body 3 has an internal threaded hole 31 and a through hole 32 that pass through from top to bottom. The thread length of the internal threaded hole 31 is 3-5 turns, that is, the length of the internal threaded hole 31 accounts for a very small part of the total length of the pin body 3, and the rest is the through hole 32. The major diameter of the internal threaded hole 31 is equal to the diameter of the through hole 32; the core rod The middle part of the core rod 1 has a necking groove 11. The top end of the core rod 1 and the necking groove 11 are connected by an upper threaded section 12. The bottom end of the core rod 1 and the necking groove 11 are connected by a lower threaded section 13 and a smooth section 14. Both the upper threaded section 12 and the lower threaded section 13 are adapted to the internal threaded hole 31. The thread length of the lower threaded section 13 is 1-5 turns. The diameter of the smooth section 14 is equal to the major diameter of the internal threaded hole 31. The drive nut 5 is screwed onto the upper threaded section 12 and contacts the limiting platform 35 on the top of the nail body 3. This invention limits the length of the internal threaded hole 31 of the nail body 3 to 3-5 turns and the length of the lower threaded section 13 of the core rod 1 to 1-5 turns. Simultaneously, the diameter of the smooth section 14 of the core rod 1 is set to be equal to the major diameter of the internal threaded hole 31. On one hand, this shortens the threaded engagement length between the nail body 3 and the core rod 1, reducing thread engagement friction and interference during installation and improving the installation success rate. On the other hand, increasing the diameter of the smooth section 14 of the core rod 1 to the major diameter of the thread effectively increases the shear resistance area of ​​the core rod 1, significantly improving the shear resistance of the threaded pull nail. Furthermore, when the smooth section 14 of the core rod 1 reaches the internal threaded hole 31 of the nail body 3, the equal diameter forms a mechanical limit, precisely controlling the upward movement distance of the core rod 1 and ensuring the uniformity of the flatness of the core rod 1's cross-section after installation.

[0034] To further optimize the technical solution of the present invention, a wrenching platform 121 is provided on both sides of the top of the upper thread section 12, which facilitates the stable engagement between the installation gun and the top of the core rod 1, prevents relative sliding during installation, and improves the reliability of installation and the convenience of operation.

[0035] Specifically, the nail sleeve 2 includes a nail sleeve body 21 and a friction-reducing ring 22. The nail sleeve body 21 is fitted onto the smooth rod section 14, and the top of the nail sleeve body 21 has a stepped hole. The friction-reducing ring 22 is placed in the stepped hole, and the guide cone 33 at the bottom of the nail body 3 is inserted into the stepped hole and contacts the friction-reducing ring 22. The friction-reducing ring 22 can effectively reduce the frictional resistance of the nail sleeve 2 during the rotation and expansion process along the guide cone 33 of the nail body 3, making the deformation of the nail sleeve 2 more uniform and smooth, avoiding jamming or uneven deformation caused by excessive friction, thereby improving the installation quality and the stability of bulge formation.

[0036] To further optimize the technical solution of the present invention, the nail sleeve 2 has a constriction 211 at the head boss 15 near the core rod 1 to press the position; the outer side of the nail body 3 has multiple circumferentially evenly arranged pressure dimples 34 corresponding to the position of the internal thread hole 31. The constriction 211 of the nail sleeve 2 increases the interference fit between the nail sleeve 2 and the core rod 1, prevents the nail sleeve 2 from falling off before installation, and enhances the connection reliability between the nail sleeve 2 and the core rod 1 after installation. After the nail sleeve 2 is deformed during installation, it can more easily form an inverted bell-shaped bulge; the multiple circumferentially evenly arranged pressure dimples 34 on the outer side of the nail body 3 cause local plastic deformation of the nail body 3 through the pressure dimples 34, resulting in interference fit between the internal thread hole 31 and the thread of the core rod 1, which significantly enhances the locking performance between the nail body 3 and the core rod 1 and effectively prevents loosening problems under dynamic loads such as vibration.

[0037] Specifically, the nail sleeve body 21 is made of stainless steel, aluminum alloy, or titanium alloy. The stainless steel is specifically 0Cr18Ni9Ti (304), the aluminum alloy is specifically 5056, and the titanium alloy is specifically CP-Ti (TA1). The core rod 1 is made of high-temperature alloy or titanium alloy. The high-temperature alloy is specifically GH2132 (A286), GH4169, or GH2132, and the titanium alloy is specifically Ti6Al4V (TC4). The nail body 3 is made of titanium alloy or high-temperature alloy. The titanium alloy is specifically Ti6Al4V (TC4) or Ti38644 (TB9), and the high-temperature alloy is specifically GH4169 or GH2132. The friction-reducing ring 22 is made of polyoxymethylene. By optimizing the selection of materials for each component, the nail sleeve body 21 is made of stainless steel, aluminum alloy, or titanium alloy, which has good plasticity and corrosion resistance, and is easy to install and deform; the core rod 1 and nail body 3 are made of high-temperature alloy or titanium alloy, which has high strength and high toughness, ensuring the load-bearing capacity and shear resistance of the nail; the friction-reducing ring 22 is made of polyoxymethylene, which has excellent self-lubricating and wear-resistant properties, and can maintain low friction characteristics for a long time, ensuring the stability of the installation process and the service life of the product.

[0038] This invention also discloses an installation method for the shear-resistant threaded pull pin as described above, comprising the following steps: Align the top of the core rod 1 with the mounting gun and insert it. Then, the mounting gun places the shear-resistant threaded pin into the mounting hole of the mounting plate 4. The mounting gun starts, clamping the hexagonal head of the drive nut 5. The drive nut presses against the upper end face of the pin body 3, keeping the pin body 3 fixed. The clamping jaws of the mounting gun drive the core rod 1 to rotate. The core rod 1 rotates and moves upward. The pin sleeve 2, which is sleeved on the core rod 1, moves upward accordingly. It expands and deforms upward along the guide cone 33 of the pin body 3, forming an upsetting head on the mounting plate 4. When the smooth section 14 of the core rod 1 reaches the internal threaded hole 31, since the diameter of the smooth section 14 is equal to the major diameter of the internal threaded hole 31, it hinders the core rod 1 from continuing to move upward. Under the drive of the mounting gun, the frictional resistance between the core rod 1 and the internal threaded hole 31 is greater than the breaking force at the neck groove 11 of the core rod 1. The core rod 1 breaks at the neck groove 11, and the installation is completed.

[0039] This invention utilizes the fact that the diameter of the smooth section 14 of the core rod 1 is equal to the diameter of the threaded hole 31 in the nail body 3 to form a mechanical limit, so that the core rod 1 automatically stops at a preset position during installation. This ensures the flatness of the cross-section of the core rod 1 without relying on torque control, significantly improving the consistency of installation quality. At the same time, because the threaded engagement length between the nail body 3 and the core rod 1 is short, the frictional resistance during installation is small, effectively avoiding abnormal situations such as thread interference and jamming, and improving the installation success rate. In addition, this method is simple to operate, has low requirements for the installation gun, and is easy to promote and apply in mass production.

[0040] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to in the method section.

[0041] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A shear-resistant threaded pull pin, comprising a core rod and a pin sleeve and a pin body sequentially sleeved on the core rod from bottom to top, characterized in that, The nail body has an internally threaded hole and a through hole that run from top to bottom. The internally threaded hole has a thread length of 3-5 turns, and the major diameter of the internally threaded hole is equal to the diameter of the through hole. The core rod has a necking groove in the middle. The top end of the core rod and the necking groove are connected by an upper threaded section and a smooth section. The upper threaded section and the lower threaded section are both adapted to the internally threaded hole. The lower threaded section has a thread length of 1-5 turns, and the diameter of the smooth section is equal to the major diameter of the internally threaded hole.

2. The shear-resistant threaded pull pin according to claim 1, characterized in that, It also includes a drive nut, which is screwed onto the upper threaded section and contacts the limiting platform at the top of the nail body.

3. The shear-resistant threaded pull pin according to claim 1, characterized in that, Tightening platforms are provided on both sides of the top of the upper threaded section.

4. A shear-resistant threaded pull pin according to claim 2, characterized in that, The nail sleeve includes a nail sleeve body and a friction-reducing ring. The nail sleeve body is sleeved on the smooth rod section, and the top of the nail sleeve body has a stepped hole. The friction-reducing ring is placed in the stepped hole, and the guide cone at the bottom of the nail body is inserted into the stepped hole and contacts the friction-reducing ring.

5. A shear-resistant threaded pull pin according to claim 1, characterized in that, The head protrusion of the nail sleeve near the core rod has a constriction to press the position; the outer side of the nail body has multiple circumferentially evenly arranged indentations corresponding to the position of the internal thread hole.

6. A shear-resistant threaded pull pin according to claim 4, characterized in that, The nail sleeve body is made of any one of stainless steel, aluminum alloy, and titanium alloy; the core rod is made of high-temperature alloy or titanium alloy; the nail body is made of titanium alloy or high-temperature alloy; the drive nut is made of carbon steel; and the friction-reducing ring is made of polyoxymethylene.

7. A method for installing a shear-resistant threaded pull stud as described in any one of claims 1-6, characterized in that, Includes the following steps: Align the top of the core rod with the mounting gun and insert it. Then, the mounting gun will insert the shear-resistant threaded pin into the mounting hole of the mounting plate. When the mounting gun is activated, it drives the mandrel upwards, and the nail sleeve fitted on the mandrel moves upwards accordingly. It expands and deforms upwards along the guide cone of the nail body, forming an upsetting head on the mounting plate. When the smooth section of the mandrel reaches the internal threaded hole, since the diameter of the smooth section is equal to the major diameter of the internal threaded hole, it hinders the mandrel from moving upwards further. Under the drive of the mounting gun, the frictional resistance between the mandrel and the internal threaded hole is greater than the breaking force at the neck groove of the mandrel, and the mandrel breaks at the neck groove, completing the installation.

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