Mechanical structure connecting device

Abstract

The mechanical structure connecting device comprises a connecting piece, the connecting piece is provided with a threaded through hole, and the connecting piece is connected with a connected object or arranged on the connected object; the expansion bodies are connected with the connecting piece, each expansion body is formed by connecting a plurality of expansion sections end to end, each expansion section is provided with an elastic piece, the two ends of each elastic piece are connected with the adjacent expansion sections respectively, and a conical through hole is defined by the expansion bodies; the upper side of the screw is in threaded connection with the threaded through hole, the lower side of the screw abuts against the hole wall of the conical through hole, butt joint grooves are formed in the two ends of the screw, and when the screw moves in the direction close to the connecting piece, the expansion body expands outwards. The expansion section is tightly attached to the hole wall of the connecting hole due to the elastic effect of the elastic piece, so that the extrusion contact area of the expansion body to the hole wall of the connecting hole is increased, and the connecting hole is better pressed to reinforce connection between a connected object and a connected object.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical structure connection and fixing, and in particular to a mechanical structure connection device. Background Art

[0002] In mechanical structure connection, the stable connection of two parts is very important. In order to fix the mechanical structure parts on the mechanical structure parts with holes or walls with holes, there are two main connection and fixing methods: threaded connection and expansion connection. For example: screw fixing connection, expansion bolt fixing connection, inner diameter expansion pin fixing connection, pneumatic integrated support chuck connection, etc.

[0003] Screw-fixed connection is suitable for mechanical structures or walls with threaded holes. The meshing principle of threads is used to ensure the tightness and stability of the connected parts. Expansion bolts are a more flexible connection method that can be applied to walls with straight holes. They are particularly suitable for fixing heavy equipment or large structures. Its working principle is to fix the bolts tightly in the hole through expansion. Inner diameter expansion pins are designed for mechanical structures with high precision requirements and are often used to connect structures with through holes. Inner diameter expansion pins are fixed by single-end adjustment. Pneumatic integrated support chuck connection is another connection method suitable for blind hole structures. It achieves the fixing effect through pneumatic devices. The connection is reinforced by tightening the screws, expansion bolts, and one end of the inner diameter expansion pin, and the pneumatic part at one end of the pneumatic integrated support chuck is adjusted to reinforce the connection. These existing threaded connections and expansion connections are all fixed by adjusting one end, which greatly limits the reinforcement adjustment method of the mechanical structure connection device and makes it difficult to adjust and fix the mechanical structure connection device in a complex installation space. Moreover, when the expansion body connected by the inner diameter expansion pin is embedded in the connecting hole of the connecting object, the expansion body expands and squeezes the wall of the connecting hole to fix the connection, but only the end of the expansion body squeezes the wall of the connecting hole, resulting in a small squeezing area of ​​the expansion body on the wall of the connecting hole, which is prone to the problem of loose connection. Summary of the invention

[0004] The technical problem to be solved by the present invention is to solve the problem that the expansion body has a small squeezing area on the wall of the connection hole, resulting in an unstable connection.

[0005] In order to solve the above technical problems, the present invention provides a mechanical structure connecting device, including: a connecting piece, the connecting piece is provided with a threaded through hole; a plurality of expansion bodies, the expansion bodies are connected to the connecting piece, the expansion bodies are formed by connecting a plurality of expansion sections end to end, the expansion sections are provided with elastic sheets, the two ends of the elastic sheets are respectively connected to adjacent expansion sections, the plurality of expansion bodies are enclosed to form a conical through hole, the first end of the conical through hole with a small aperture is connected to the threaded through hole; a screw, the upper side of the screw is threadedly connected to the threaded through hole, the lower side of the screw is abutted against the wall of the tapered through hole, both ends of the screw are provided with docking grooves, when the screw moves towards the connecting piece, the expansion body expands outward.

[0006] Furthermore, the expansion body is formed by connecting a plurality of expansion segments of different lengths end to end, and the lengths of the plurality of expansion segments gradually increase along a direction approaching the connecting member.

[0007] Furthermore, the screw includes a conical portion and a threaded cylindrical portion, the cylindrical portion is threadedly connected to the threaded through hole, the first end of the conical portion with the smallest diameter is connected to the cylindrical portion, the conical portion is located at the conical through hole, and at least part of the side surface of the conical portion is against the wall of the conical through hole.

[0008] Furthermore, the expansion body consists of a first expansion segment, a second expansion segment and a third expansion segment whose lengths decrease successively, the first expansion segment, the second expansion segment and the third expansion segment are connected in sequence, the first expansion segment is connected to the connecting member, and the length of the first expansion segment is: d1=H*(d2+d3) / R; wherein d1 is the length of the first expansion segment, d2 is the length of the second expansion segment, d3 is the length of the third expansion segment, H is the height of the conical portion, and R is the maximum radius of the conical portion.

[0009] Furthermore, the second end of the tapered portion with the largest diameter passes through the tapered through hole port and extends outward, and the diameter of the second end of the tapered portion is larger than the maximum inner diameter of the tapered through hole and smaller than the outer diameter of the connecting piece.

[0010] Furthermore, a gap is left between two adjacent expansion bodies, and the gap is connected to the tapered through hole.

[0011] Furthermore, an annular groove is provided at the connection between the connecting member and the expansion body, and the annular groove is located between the threaded through hole and the tapered through hole.

[0012] Furthermore, an annular protrusion is provided on the side surface of the connecting piece, the annular protrusion is located at the end of the threaded through hole, and the annular protrusion is provided with a threaded hole.

[0013] Furthermore, the docking groove is a hexagonal groove.

[0014] Furthermore, the expansion body is made of elastic material.

[0015] Compared with the prior art, a mechanical structure connecting device according to an embodiment of the present invention has the following beneficial effects: the expansion body connected to the connecting piece is fixed on the connected object by being integrally connected to the connected object or being arranged on the connected object, and then the expansion body is buried in the connecting hole of the connecting object, and the screw is twisted through the docking groove at either end of the docking screw to move from the expansion body toward the connecting piece. Under the action of the lower side wall of the screw squeezing the wall of the tapered through hole outward, the expansion body begins to deform and expand outward. Because the expansion body is composed of multiple expansion sections, it can undergo flexibly deformation in some positions. The expansion section below the screw will be tightly attached to the wall of the connecting hole due to the elastic action of the elastic sheet, thereby increasing the extrusion contact area of ​​the expansion body on the wall of the connecting hole, and then better compressing the connecting hole of the connecting object to strengthen the connection between the connected object and the connecting object. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a three-dimensional diagram of the mechanical structure connection device provided by the present invention;

[0017] Figure 2 is a first cross-sectional view of the mechanical structure connection device provided by the present invention;

[0018] Figure 3 It is a second cross-sectional view of the mechanical structure connecting device provided by the present invention.

[0019] The corresponding relationship between the reference numerals and the component names is as follows:

[0020] 1. Connecting piece; 11. Annular protrusion; 101. Threaded through hole; 2. Expansion body; 21. Expansion section; 211. Elastic sheet; 201. Conical through hole; 202. Annular groove; 3. Screw; 31. Conical portion; 31. Columnar portion; 301. Docking groove. DETAILED DESCRIPTION

[0021] The following is a description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, including various details of the embodiments of the present invention to facilitate understanding, which should be considered as merely exemplary. Therefore, it should be appreciated by those of ordinary skill in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope of the present invention. Similarly, for clarity and conciseness, descriptions of well-known functions and structures are omitted in the following description.

[0022] like Figures 1 to 3 As shown, an embodiment of the present invention discloses a mechanical structure connection device, including: a main connection member 1, a plurality of expansion bodies 2 and screws 3.

[0023] Among them, the connecting member 1 is provided with a threaded through hole 101, and the connecting member 1 is connected to the connected object or is arranged on the connected object; the expansion body 2 is connected to the connecting member 1, and the expansion body 2 is formed by multiple expansion segments 21 connected end to end, and the expansion segment 21 is provided with an elastic sheet 211, and the two ends of the elastic sheet 211 are respectively connected to adjacent expansion segments 21, and multiple expansion bodies 2 are enclosed to form a conical through hole 201, and the first end of the conical through hole 201 with a small aperture is connected to the threaded through hole 101; the upper side of the screw 3 is threadedly connected to the threaded through hole 101, and the lower side of the screw 3 is against the wall of the conical through hole 201, and docking grooves 301 are provided at both ends of the screw 3. When the screw 3 moves toward the connecting member 1, the expansion body 2 expands outward.

[0024] The mechanical structure connection device of the present application is connected to the connected object in one piece or arranged on the connected object through the connection piece 1, so that the expansion body 2 connected to the connection piece 1 is fixed on the connected object, and then the expansion body 2 is buried in the connection hole of the connecting object, and the screw 3 is twisted through the docking groove 301 at either end of the docking screw 3, so that the screw 3 moves from the expansion body 2 toward the connecting piece 1. Under the action of the lower side wall of the screw 3 squeezing the wall of the tapered through hole 201 outward, the expansion body 2 begins to undergo elastic deformation and expand outward, thereby pressing the connection hole of the connecting object to strengthen the connection between the connected object and the connecting object. The screws 3 can be twisted at both ends of the mechanical structure connection device to strengthen the connection between the objects, and the mechanical structure connection device can be adjusted and fixed in a complex installation space.

[0025] Through the cooperation of the expansion body 2 and the connector 1, strong mechanical locking can be achieved. When the screw 3 rotates, the expansion body 2 expands outward along the wall of the tapered through hole 201, generating an outward extrusion force, making the connection between the connector 1 and the connected object more stable, avoiding the problem of loosening or falling off due to excessive load. The elastic deformation characteristics of the expansion body 2 enable the mechanical structure connection device to evenly distribute pressure even under high load conditions, enhance the bearing capacity of the connection part, ensure that there will be no loosening during long-term use, and improve the durability and service life of the connector 1.

[0026] The mechanical structure connection device of the present invention can be flexibly adjusted in narrow or complex installation spaces. Due to the adjustable rotation characteristics of the screw 3, the user can still easily adjust and fix the connector 1 even in difficult-to-access areas, which is very suitable for occasions with limited space or difficult operation, and improves the convenience of installation and maintenance. Compared with traditional connection methods, the mechanical structure connection device is more compact, can achieve efficient fixation in a limited space, and adapt to more application requirements, especially when multi-point fixation is required or high connection accuracy is required. The mechanical structure connection device adopts the method of rotating the screw 3 to drive the expansion body 2 to expand. It is easy to operate and can be installed without complex tools or techniques, shortening the construction and installation time and reducing labor intensity. The mechanical structure connection device of the present invention can adjust the rotation direction and strength of the screw 3 according to actual needs, adapt to different installation requirements, so that it can provide reliable and accurate fixing effects in a variety of different scenarios, and is suitable for machinery, construction and other fields.

[0027] The mechanical structure connection device of the present invention can not only meet general fixing requirements, but also meet installation requirements in special environments. Whether it is a complex mechanical structure or a narrow building space, the mechanical structure connection device can provide an efficient fixing effect.

[0028] Specifically, the diameter of the connector 1 is equivalent to the diameter of the hole of the connected object, and the expansion body 2 is connected to the connector 1, and its material is an elastic material. The expansion body 2 is composed of four structures of the same shape, and its distribution angle is 90°; multiple expansion bodies 2 enclose a conical through hole 201, and the exterior of the multiple expansion bodies 2 is circular, and the diameter of the multiple expansion bodies 2 is equivalent to the diameter of the hole of the connected object. Under the action of the outward extrusion force, the expansion body 2 begins to undergo elastic deformation and expand outward, thereby pressing the hole of the connected object and playing a role in connection and fixing. When the outward extrusion force is reduced, the expansion body 2 realizes elastic reset, which is convenient for removal.

[0029] Specifically, the upper end portion of the connector 1 can increase the cross section or increase the connection hole as needed, or be the main part of the connected object, and be directly processed and formed as a part of the connected object. When the connector 1 is connected to the connected object, a threaded hole or other type of hole can be added to the upper end surface of the connector 1, and then fixed with other screws; other screws matching the connector 1 can be used for connection and fixing, and the lower part of the threaded through hole 101 of the connector 1 is used for threaded connection with the adjustable screws 3 at both ends, and the upper part of the threaded hole can be connected with other screws.

[0030] like Figure 1 and Figure 2As shown, in an optional embodiment of the present invention, a gap is left between two adjacent expansion bodies 2, and the gap is connected to the tapered through hole 201. By leaving a gap between adjacent expansion bodies 2, friction and resistance can be effectively reduced during the outward expansion process, so that the expansion body 2 can move more smoothly in the hole of the connected object, which helps the expansion body 2 to better adapt to the shape of the hole wall during initial installation, ensuring uniform force and stability during the connection process. Since the gap is connected to the tapered through hole 201, the tapered portion 31 better transmits pressure to the expansion body 2, and the load can be more evenly distributed between adjacent expansion bodies 2. The expansion bodies 2 can work together when subjected to force, thereby enhancing the bearing capacity of the entire mechanical structure connection device and avoiding connection failure or loosening caused by local overload. The setting of the gap allows the expansion body 2 to have a certain elastic deformation space when subjected to force, which can better absorb external vibration or impact, so that the mechanical structure connection device can effectively reduce stress concentration under vibration or impact load, and improve seismic resistance and stability.

[0031] Through the gaps between adjacent expansion bodies 2, the expansion bodies 2 can more flexibly adapt to different installation environments and hole wall shapes, and users can more easily adjust the displacement and tightening strength of the expansion bodies 2 during installation, simplifying the installation adjustment process and improving the convenience of operation. Due to the gaps between the expansion bodies 2, the expansion bodies 2 are less deformed and rubbed against each other, thereby reducing wear and damage on the surface of the material, helping to extend the service life of the mechanical structure connection device and reduce maintenance costs in long-term use.

[0032] Specifically, the expansion body 2 is composed of four arc-shaped plates of the same shape, and the central angle of the arc-shaped plates is 90°. The expansion body 2 and the connecting member 1 are integrally formed.

[0033] like Figure 1 and Figure 2 As shown, in an optional embodiment of the present invention, an annular groove 202 is provided at the connection between the connecting member 1 and the expansion body 2 , and the annular groove 202 is located between the threaded through hole 101 and the tapered through hole 201 .

[0034] By providing an annular groove 202 at the connection between the connector 1 and the expansion body 2, not only the activity of the expansion body 2 is increased, and the expansion body 2 is convenient for expansion outward, but also the stress applied to the expansion body 2 is evenly distributed during the connection process, so as to avoid damage or loosening of the connector 1 caused by local stress concentration, and help to improve the overall stability and bearing capacity of the mechanical structure connection device. The annular groove 202 can play a positioning role during the installation process, so that the docking between the connector 1 and the expansion body 2 is more accurate and stable, the error during installation is reduced, and the efficient installation and long-term stable operation of the mechanical structure connection device are ensured. By providing the annular groove 202, the contact state of the connection part can be improved, the direct friction between the connection parts is reduced, thereby reducing wear and extending the service life of the mechanical structure connection device. In addition, the annular groove 202 can also help to disperse the load and further reduce the loss in long-term use. The presence of the annular groove 202 can provide a certain elastic buffer space, which can effectively disperse the stress when the connector 1 is subjected to external vibration or impact, reduce the influence of external force on the mechanical structure connection device, and improve the seismic resistance and stability of the connector 1 under dynamic load. The annular groove 202 makes it easier to adjust and maintain the connection between the connector 1 and the expansion body 2. If the connection part becomes loose or aged, the annular groove 202 can provide a certain adjustment space, which is convenient for later maintenance and repair, and reduces maintenance costs.

[0035] Specifically, an annular groove 202 is provided on the inner wall and the outer wall of the connection between the connecting member 1 and the expansion body 2 .

[0036] like Figure 1 and Figure 2 As shown, in an optional embodiment of the present invention, the screw 3 includes a conical portion 31 and a cylindrical portion 31 with a thread, the cylindrical portion 31 is threadedly connected to the threaded through hole 101, the first end of the conical portion 31 with the smallest diameter is connected to the cylindrical portion 31, the conical portion 31 is located at the conical through hole 201, and at least part of the side surface of the conical portion 31 is against the wall of the conical through hole 201.

[0037] The contact between the conical portion 31 and the wall of the conical through hole 201 provides additional positioning and support, ensuring that the screw 3 can apply pressure evenly when tightening, avoiding loosening or deformation of the expansion body 2 due to uneven tightening, making the connection more stable, especially under dynamic load or vibration environment, and can better maintain the stability of the connection. The abutting contact between the conical portion 31 and the wall of the conical through hole 201 can effectively disperse the pressure transmitted to the connection part by external impact force or vibration, reduce the impact of vibration on the mechanical structure connection device, and have better shock resistance when subjected to external force impact, and is particularly suitable for use in application scenarios with high vibration or frequent movement. The contact between the conical portion 31 and the conical through hole 201 can effectively seal the connection part, reduce the penetration of air, moisture or other external substances, and improve the sealing of the connection, which is particularly suitable for applications with high protection requirements, such as waterproof, dustproof or corrosion-resistant fields.

[0038] Through the conical portion 31 and the cylindrical portion 31 of the screw 3, the applied load can be distributed more evenly during connection, reducing local stress concentration, which helps to improve the durability and load-bearing capacity of the mechanical structure connection device, especially under high load or complex stress environment, and can effectively prevent structural failure. The conical portion 31 and the conical through hole 201 make the installation and removal of the screw 3 easier. During installation, the screw 3 can be guided to the correct position by the conical portion 31 to avoid alignment errors; and during removal, the structure of the conical portion 31 makes it easier to loosen and remove the screw 3, which is convenient for later maintenance and replacement. The close fit of the conical portion 31 and the conical through hole 201, while preventing leakage and improving sealing, also helps to improve the integrity of the overall structure, making the connecting parts more closely matched, and effectively improving the durability and reliability of the entire mechanical mechanism. Specifically, the conical portion 31 and the cylindrical portion 31 are integrally formed.

[0039] like Figure 2 As shown, in an optional embodiment of the present invention, the expansion body is composed of a first expansion section, a second expansion section and a third expansion section of decreasing lengths in sequence, the first expansion section, the second expansion section and the third expansion section are connected in sequence, the first expansion section is connected to the connecting piece, and the length of the first expansion section is: d1 = H*(d2+d3) / R; wherein d1 is the length of the first expansion section, d2 is the length of the second expansion section, d3 is the length of the third expansion section, H is the height of the tapered portion, and R is the maximum radius of the tapered portion. By making the length d1 of the first expansion section positively correlated with the slope of the tapered portion, when the slope of the tapered portion is high, the first expansion section also has enough length to squeeze the wall of the connecting hole to strengthen the connection.

[0040] like Figure 1 and Figure 2As shown, in an optional embodiment of the present invention, the second end of the tapered portion 31 with the largest diameter passes through the port of the tapered through hole 201 and extends outward, and the diameter of the second end of the tapered portion 31 is larger than the maximum inner diameter of the tapered through hole 201, and smaller than the outer diameter of the connector 1. By making the diameter of the second end of the tapered portion 31 larger than the maximum inner diameter of the tapered through hole 201, it not only helps the tapered portion 31 to squeeze the expansion body 2 to expand outward, but also effectively seals the connection part to prevent foreign substances from entering, thereby improving the protection capability of the connection part. Since the tapered portion 31 at the second end is tightly matched with the tapered through hole 201, the gap between the components can be effectively reduced, further improving the stability of the connection and avoiding the problem of looseness.

[0041] like Figure 2 As shown, in an optional embodiment of the present invention, the expansion body 2 is formed by connecting a plurality of expansion segments 21 of different lengths end to end, and the lengths of the plurality of expansion segments 21 gradually increase along the direction approaching the connecting member 1. By gradually increasing the lengths of the plurality of expansion segments 21 along the direction approaching the connecting member 1, as the screw moves in the direction approaching the connecting member, the displacement of the expansion segment 21 toward the wall of the connecting hole of the connecting object increases as the length of the expansion segment 21 increases, thereby better adapting to connecting holes of different apertures.

[0042] like Figure 2 As shown, in an optional embodiment of the present invention, the inclination of the side surface of the tapered portion 31 is less than the inclination of the wall of the tapered through hole 201. By controlling the inclination of the side surface of the tapered portion 31 to be less than the inclination of the wall of the tapered through hole 201, the stress of the expansion body 2 can be concentrated during the force-bearing process, which helps the expansion body 2 to expand and move outward quickly. Due to the setting of the inclination, the stress concentration makes the contact between the tapered portion 31 and the tapered through hole 201 closer, which can provide better sealing performance, help prevent foreign substances, such as moisture, dust, oil, etc. from entering the connection part, and improve the protection ability of the connection, thereby ensuring the normal operation of the equipment or system, which is particularly suitable for application scenarios requiring high sealing.

[0043] By making the side inclination angle a of the tapered portion 31 smaller than the inclination angle b of the hole wall of the tapered through hole 201, the mechanical structure connection device is easier to separate when it needs to be disassembled. The smaller inclination helps to reduce the jamming phenomenon during the disassembly process, making the disassembly operation smoother and faster, reducing the difficulty of disassembly and maintenance, improving the maintenance efficiency, and reducing the damage that may be caused by the difficulty of disassembly. Since the cooperation between the tapered portion 31 and the tapered through hole 201 is more precise and uniform, better mechanical properties can be achieved, and it can ensure that the connecting parts can evenly distribute stress when subjected to load, improve the load bearing capacity, reduce the deformation or damage caused by excessive local stress in the connection part, and improve the reliability and safety of the mechanical structure connection device. The side inclination of the tapered portion 31 is small, which can effectively reduce the friction between the two parts during assembly and use. The smaller inclination means that the contact surface is smoother, the friction is reduced, and the wear caused by friction is reduced. This is of great significance for the long-term use and disassembly of the connector 1, and can effectively avoid component damage or connection failure caused by wear.

[0044] like Figure 3 As shown, in an optional embodiment of the present invention, an annular protrusion 11 is provided on the side of the connecting member 1, and the annular protrusion 11 is located at the end of the threaded through hole 101, and the annular protrusion 11 is provided with a threaded hole.

[0045] The connection between the connector 1 and the connected object is fixed by threaded connection through the threaded hole. The annular protrusion 11 is located at the end of the threaded through hole 101, which helps to provide additional positioning support when the connector 1 is assembled on the connected object, and can effectively prevent the connector 1 from slipping or displacement during use, thereby improving the stability and reliability of the overall connection. The annular protrusion 11 can provide additional contact pressure at the connection part and improve the sealing of the hole at the connection. By forming a closed contact surface at the end of the threaded through hole 101, it helps to prevent external substances such as water, dust, oil, etc. from entering the connection part, thereby protecting the internal components from contamination or damage, and ensuring the good performance of the mechanical structure connection device in various environments. The provision of the threaded hole can make the installation process easier. During installation, the connector 1 can be quickly and accurately connected to the connected object through the threaded hole, thereby reducing the installation time and operation complexity and improving the assembly efficiency. The annular protrusion 11 and the threaded hole can provide a stronger connection strength. During the installation of the connector 1, the threaded holes can better distribute the load and enhance the tensile strength and shear resistance of the connection part. Especially when subjected to large external forces or vibrations, it can effectively improve the tensile strength of the connection and reduce the risk of connection failure caused by uneven force.

[0046] like Figure 2 and Figure 3As shown, in an optional embodiment of the present invention, the docking groove 301 is a hexagonal groove. By setting the docking groove 301 as a hexagonal groove, compared with a circular or square notch, the hexagonal shape can provide more stable docking and tightening, and the six planes can distribute the external force more evenly, thereby reducing the risk of slippage and loosening, and improving the stability and reliability of the connection. The hexagonal groove can effectively increase the contact area of ​​the screw 3 and improve the torque resistance of the connection part. Under stress, the hexagonal notch can provide a large friction force to prevent the connector 1 from loosening or deforming due to excessive torque, and is particularly suitable for connection occasions that need to withstand a large rotational torque. The shape of the hexagonal groove enables the connector 1 to have a strong self-alignment ability during installation, reducing the operator's precise requirements for position and direction. In addition, it can be tightened quickly and conveniently by a hexagonal wrench, which simplifies the installation process and improves assembly efficiency. The structure of the hexagonal groove can provide a more precise docking fit.

[0047] Since the hexagonal docking groove 301 usually has a higher processing accuracy, it can ensure that the connector 1 is docked more accurately during the installation process, thereby improving the overall quality and reliability of the connection. Compared with other shapes, the polygonal structure of the hexagonal groove can provide a larger contact area during the connection process, increase the friction during the connection, thereby effectively improving the anti-loosening performance and preventing the connection parts from loosening due to vibration or other factors. Since the fasteners matched with the hexagonal groove are usually operated with hexagonal tools, such as hexagonal wrenches, this makes disassembly and maintenance easier and more efficient. The hexagonal docking groove 301 notch can effectively avoid damage caused by tool slippage during disassembly, reduce maintenance difficulty, and improve maintenance efficiency.

[0048] In an optional embodiment of the present invention, the docking groove 301 is a cross groove or a slotted groove. By setting the docking groove 301 as a cross groove or a slotted groove, the screw 3 has a high self-alignment during installation, which simplifies the assembly process. Due to the shape of the notch, the screw 3 can be easily docked with the corresponding docking component, which reduces the requirements for operating accuracy and improves assembly efficiency. The cross groove or the slotted groove can usually be operated with common tools, such as a cross screwdriver or a slotted screwdriver. The versatility and popularity of the tools make the installation and disassembly process more convenient, help reduce the difficulty of equipment maintenance and installation, and are suitable for large-scale production and maintenance operations. The cross groove or the slotted groove can provide a reliable docking fit to ensure a firm fixation between the screw 3 connecting parts, especially under the action of torque, the cross groove or the slotted groove can effectively transfer the applied force to the contact surface of the expansion body 2, reducing the risk of loosening due to loose or offset connection. The cross groove or the slotted groove can provide a larger contact area and increase friction, thereby improving the anti-loosening ability of the connection and facilitating alignment in complex limited spaces. Especially under vibration or long-term use conditions, it can effectively prevent the connector 1 from loosening or falling off due to external forces, thereby enhancing the reliability of the mechanical structure connection device.

[0049] Since the cross slot or the slotted slot has a simple shape, it is easy to manufacture it through conventional processing methods, such as lathes, milling machines, etc. Compared with complex geometric shapes, it can reduce the manufacturing process and production costs, help improve production efficiency and reduce overall costs. The cross slot and the slotted slot are suitable for various connection occasions and can be used with most standard connectors1, with strong adaptability. Whether it is a small mechanical device or a large equipment, this slot can be used to meet the needs of a variety of industries. Due to the universality of the cross slot or the slotted slot, common tools can easily achieve disassembly and maintenance, reducing the maintenance time caused by difficult disassembly, improving the maintainability of the equipment, and facilitating daily inspection, maintenance and troubleshooting.

[0050] In an optional embodiment of the present invention, the expansion body 2 is made of an elastic material. By making the expansion body 2 made of an elastic material, the expansion body 2 has good elasticity and deformable properties, and the expansion body 2 can adapt to different connection conditions, thereby enhancing the stability and reliability of the mechanical structure connection device. The elastic material can effectively absorb the impact and vibration applied by the outside world, reduce the pressure transmitted to the mechanical structure connection device, and help extend the service life of the structure. The elastic material can provide a better sealing effect during the connection process, prevent the entry of external impurities, dust, etc., and improve the sealing and durability of the connection components. The elastic material has strong adaptability and can maintain its performance in a wide temperature range and under different environmental conditions, and is suitable for a variety of complex working environments. Due to the deformable characteristics of the elastic material, the expansion body 2 can more conveniently enter the hole of the connected object during installation, simplifying the installation process and improving work efficiency. By loosening the screw 3, when the outward extrusion force of the conical portion 31 of the screw 3 is reduced, the expansion part is elastically reset, thereby facilitating the removal of the mechanical structure connection device.

[0051] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution disclosed in the present invention can be achieved, and this document does not limit this.

[0052] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A mechanical structure connection device, characterized in that: include: A connecting piece, wherein the connecting piece is provided with a threaded through hole; A plurality of expansion bodies, the expansion bodies are connected to the connecting member, the expansion bodies are formed by connecting a plurality of expansion sections end to end, the expansion sections are provided with elastic sheets, the two ends of the elastic sheets are respectively connected to the adjacent expansion sections, the plurality of expansion bodies are surrounded to form a tapered through hole, and the first end of the tapered through hole with a small aperture is connected to the threaded through hole; A screw, wherein the upper side of the screw is threadedly connected to the threaded through hole, the lower side of the screw is against the wall of the tapered through hole, and docking grooves are provided at both ends of the screw. When the screw moves toward the connecting piece, the expansion body expands outward.

2. The mechanical structure connecting device according to claim 1, characterized in that: The expansion body is formed by connecting a plurality of expansion segments of different lengths end to end, and the lengths of the plurality of expansion segments gradually increase along a direction approaching the connecting member.

3. The mechanical structure connecting device according to claim 2, characterized in that: The screw includes a conical portion and a threaded cylindrical portion, the cylindrical portion is threadedly connected to the threaded through hole, the first end of the conical portion with the smallest diameter is connected to the cylindrical portion, the conical portion is located at the conical through hole, and at least part of the side surface of the conical portion is against the wall of the conical through hole.

4. The mechanical structure connection device according to claim 3, characterized in that: The expansion body is composed of a first expansion section, a second expansion section and a third expansion section with decreasing lengths in sequence, the first expansion section, the second expansion section and the third expansion section are connected in sequence, the first expansion section is connected to the connecting member, and the length of the first expansion section is: d1 = H*(d2+d3) / R; Wherein, d1 is the length of the first expansion section, d2 is the length of the second expansion section, d3 is the length of the third expansion section, H is the height of the tapered portion, and R is the maximum radius of the tapered portion.

5. The mechanical structure connection device according to claim 3, characterized in that: The second end of the tapered portion with the largest diameter passes through the tapered through hole port and extends outwardly. The diameter of the second end of the tapered portion is larger than the maximum inner diameter of the tapered through hole and smaller than the outer diameter of the connecting piece.

6. The mechanical structure connecting device according to claim 1, characterized in that: A gap is left between two adjacent expansion bodies, and the gap is communicated with the tapered through hole.

7. The mechanical structure connection device according to claim 1, characterized in that: An annular groove is provided at the connection between the connecting piece and the expansion body, and the annular groove is located between the threaded through hole and the tapered through hole.

8. The mechanical structure connection device according to claim 1, characterized in that: An annular protrusion is provided on the side of the connecting piece, the annular protrusion is located at the end of the threaded through hole, and the annular protrusion is provided with a threaded hole.

9. The mechanical structure connection device according to claim 1, characterized in that: The docking groove is a hexagonal groove.

10. The mechanical structure connection device according to claim 1, characterized in that: The expansion body is made of elastic material.

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