Multi-pushing fastening nut

Abstract

The utility model discloses a multi-pushing fastening nut, which relates to the technical field of fasteners and comprises a main nut, a plurality of pushing screws and a gasket. A through central connecting threaded hole is formed in the middle of the main nut; a plurality of through pushing screw holes are formed in the circumferential direction of the center connecting threaded hole; the pushing screw hole comprises a first unthreaded hole and a first threaded hole; one end of the first unthreaded hole is connected and communicated with one end of the first threaded hole; the inner diameter of the first unthreaded hole is larger than that of the first threaded hole; the pushing screw comprises a screw head, an external threaded rod and a polished rod; the screw head is used for being rotated by a rotating tool and fixedly arranged at one end of the external threaded rod, and one end of the polished rod is fixedly connected with the end, away from the screw head, of the external threaded rod. The outer diameter of the polished rod is smaller than that of the external threaded rod; a through hole is formed in the middle of the gasket. The dismounting operation is simple and convenient, the cost is low, the pre-tightening force is high and can be stably adjusted, and safe and stable operation of equipment is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of fasteners, in particular to a multi-thrust fastening nut. Background Art

[0002] Bolt connection is widely used in modern industry due to its advantages of reliable connection and simple installation. Most of the bolts are fastened with a single nut, but the traditional bolt fastening method has problems such as complex installation tools, high labor costs, and difficult to control the fastening force.

[0003] In the fields of mechanical engineering, automobile manufacturing, aerospace, etc., the requirements for the tightening of connectors are becoming increasingly stringent. Therefore, a nut structure that is easy to disassemble and assemble, low in cost, and has a stable and reliable pre-tightening force is needed as a matching part for bolts, etc. to ensure the safe and stable operation of the equipment. Utility Model Content

[0004] The purpose of the utility model is to provide a multi-thrust fastening nut to solve the problems existing in the above-mentioned prior art. The disassembly and assembly operation is simple and convenient, the cost is low, the pre-tightening force is high and can be stably adjusted, so as to ensure the safe and stable operation of the equipment.

[0005] To achieve the above purpose, the utility model provides the following solutions:

[0006] The utility model provides a multi-thrust fastening nut, comprising a main nut, a plurality of thrust screws and a washer; a central connecting threaded hole is provided in the middle of the main nut; and a plurality of thrust screw holes are arranged circumferentially of the central connecting threaded hole; the thrust screw hole comprises a first light hole and a first threaded hole; one end of the first light hole is connected and communicated with one end of the first threaded hole; the inner diameter of the first light hole is larger than the inner diameter of the first threaded hole; the thrust screw comprises a screw head, an external threaded rod and a light rod; the screw head is used to be rotated by a rotating tool, the screw head is fixed at one end of the external threaded rod, and One end of the smooth rod is fixedly connected to the end of the externally threaded rod away from the screw head; the outer diameter of the smooth rod is smaller than the outer diameter of the externally threaded rod; a through hole is provided in the middle of the washer; the washer is used to be placed on the side of the main nut having the first threaded hole, and the through hole corresponds to the central connecting threaded hole; the externally threaded rod of the push screw is used for threaded connection with the first threaded hole of the push screw hole, and the push screw has one end of the smooth rod that passes through the first smooth hole and the first threaded hole of the push screw hole and then abuts against the side of the washer close to the main nut.

[0007] Preferably, a spherical protrusion is fixedly provided at one end of the smooth rod away from the externally threaded rod.

[0008] Preferably, the hardness of the main nut is lower than the hardness of the push screw.

[0009] Preferably, the main nut is made of medium carbon CrMo steel; the push screw is made of medium carbon CrNiMo steel; and the washer is made of cemented carbide.

[0010] Preferably, the surface of the main nut has a surface treatment layer of a rust-proof or corrosion-resistant coating.

[0011] Preferably, the push screw holes are evenly spaced around the axis of the central connecting threaded hole.

[0012] Compared with the prior art, the utility model has achieved the following technical effects:

[0013] The multi-thrust fastening nut provided by the utility model can directly replace the traditional standard hexagonal nut. First, a washer with a through hole is set on the threaded end of the bolt or stud that needs to be matched, and then the main nut is threadedly connected to the threaded end of the bolt or stud. After the main nut is in place, the actual tightening process is not to directly operate the main nut, but to be achieved by tightening each thrust screw by a rotating tool (a torque wrench or an ordinary wrench, etc.); such a design makes the main nut mainly bear pure tension, while the thrust screw plays a role in dispersing the pre-tightening force; when tightening, only one rotating tool is required to tighten each thrust screw step by step, so as to achieve a higher tightening force, which is particularly suitable for use in connections such as pistons that bear alternating loads; the first light hole set on the thrust screw hole has three functions: first, reducing the tapping length and difficulty: the existence of the first light hole can reduce the overall depth of the first threaded hole while ensuring the effective screwing length of the thread, thereby reducing the labor time and difficulty of tapping. This design is particularly effective for long bolt connections because it reduces the difficulty of thread processing coaxiality; secondly, the polished rod set at the front end of the push screw can cooperate with the first light hole to realize the pre-installation of the push screw, so that the push screw can be stably placed in the corresponding push screw hole after the hand loosens its grip, which plays an auxiliary installation role for the subsequent rotational installation of the push screw and improves the installation speed; thirdly, when the polished rod of the push screw cooperates with the first light hole, based on the contact of both of them with non-threaded sections, after the polished rod of the push screw is located in the push screw hole, the threads of the external threaded rod on the push screw avoid damage to its threads caused by excessive contact with the inner wall of the first light hole; the entire structure makes disassembly and assembly simple and convenient, without the need for special tools, low cost, high preload force, and the ability to adjust the overall stable preload force by step-by-step adjustment of the push screw, thereby ensuring safe and stable operation of the equipment.

[0014] Furthermore, the provision of the spherical protrusion can ensure that each jacking screw and the washer always maintains a good jacking effect; and the spherical protrusion can enable the jacking screw to be inserted into the corresponding jacking screw hole more smoothly, thereby improving installation efficiency.

[0015] Furthermore, the hardness of the main nut is set to be lower than that of the push screw, so that the push screw can be easily removed from the main nut even if the lubrication is not good; and because the push screw has a high hardness, it is not easy to break or be damaged when subjected to the push force, thereby ensuring the stability and reliability of the entire structure.

[0016] Furthermore, medium carbon CrMo steel has high yield strength and tensile strength while maintaining good toughness, which makes the main nut less likely to break or deform when subjected to high loads and impacts, ensuring the stability and reliability of the connection; medium carbon CrNiMo steel provides high strength and excellent toughness through reasonable carbon content and the addition of alloying elements. This makes the jacking screw less likely to break when subjected to high loads, while maintaining stable performance under impact and vibration conditions; cemented carbide has extremely high hardness and wear resistance, which makes the washer less likely to wear or damage when subjected to jacking force and friction, helping to maintain the long-term stability and reliability of the washer, thereby ensuring overall performance.

[0017] Furthermore, the provision of a surface treatment layer of rust-proof or corrosion-resistant coating can prevent metal materials from contacting external corrosive media (such as moisture, oxygen, chemicals, etc.), thereby avoiding or slowing down the rust and corrosion of metal materials, and significantly improving their service life and reliability, especially in harsh environments such as humidity and corrosion.

[0018] Furthermore, the push screw holes are evenly spaced and arranged at the circumferential position of the central connecting threaded hole, so that the push screws can be evenly stressed, ensuring a good pre-tightening effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A schematic diagram of the overall structure of the multi-thrust fastening nut provided by the utility model;

[0021] Figure 2 A schematic diagram of the structure of the main nut in the multi-thrust fastening nut provided by the utility model;

[0022] Figure 3 A schematic diagram of the structure of a jack screw in a multi-jack fastening nut provided by the utility model;

[0023] Figure 4 A schematic diagram of the structure of a washer in a multi-thrust fastening nut provided by the utility model;

[0024] Figure 5 The utility model is a schematic diagram of the use of a multi-thrust fastening nut and a bolt.

[0025] In the figure:

[0026] 100-Multi-thrust fastening nut;

[0027] 10-main nut; 11-center connecting threaded hole; 12-pushing screw hole; 121-first light hole; 122-first threaded hole;

[0028] 20-thrust screw; 21-screw head; 211-bolt head; 212-head lower flange; 22-external threaded rod; 23-plain rod; 24-spherical protrusion;

[0029] 30-washer; 31-through hole. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] The utility model aims to provide a multi-thrust fastening nut to solve the problems existing in the prior art. The disassembly and assembly operation is simple and convenient, the cost is low, the pre-tightening force is high and can be stably adjusted, so as to ensure the safe and stable operation of the equipment.

[0032] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0033] Embodiment 1

[0034] This embodiment provides a multi-thrust fastening nut 100, such as Figure 1 to Figure 5As shown, it includes a main nut 10, a plurality of push screws 20 and a washer 30; a central connecting threaded hole 11 is provided in the middle of the main nut 10; and a plurality of push screw holes 12 are arranged circumferentially of the central connecting threaded hole 11; the push screw hole 12 includes a first light hole 121 and a first threaded hole 122; one end of the first light hole 121 is connected and communicated with one end of the first threaded hole 122; the inner diameter of the first light hole 121 is larger than the inner diameter of the first threaded hole 122; the push screw 20 includes a screw head 21, an external threaded rod 22 and a light rod 23; the screw head 21 is used to be rotated by a rotating tool, and the screw head 21 is fixed to one end of the external threaded rod 22 end, and one end of the polished rod 23 is fixedly connected to the end of the externally threaded rod 22 away from the screw head 21; the outer diameter of the polished rod 23 is smaller than the outer diameter of the externally threaded rod 22; a through hole 31 is provided in the middle of the washer 30; the washer 30 is used to be placed on the side of the main nut 10 having the first threaded hole 122, and the through hole 31 corresponds to the central connecting threaded hole 11; the externally threaded rod 22 of the push screw 20 is used for threaded connection with the first threaded hole 122 of the push screw hole 12, and the push screw 20 has one end of the polished rod 23 after passing through the first polished hole 121 and the first threaded hole 122 of the push screw hole 12, and abuts against the side of the washer 30 close to the main nut 10.

[0035] It can directly replace the traditional standard hexagonal nut. First, the washer 30 with a through hole 31 is sleeved on the threaded end of the bolt or stud that needs to be matched, and then the main nut 10 is threadedly connected to the threaded end of the bolt or stud. After the main nut 10 is in place, the actual tightening process is not to directly operate the main nut 10, but to tighten each push screw 20 by a rotating tool (torque wrench or ordinary wrench, etc.); such a design makes the main nut 10 mainly bear pure tension, while the push screw 20 plays a role in dispersing the pre-tightening force; when tightening, only one rotating tool is required to tighten each push screw 20 step by step, so as to achieve a higher tightening force, which is particularly suitable for use in connections such as pistons that bear alternating loads; the first light hole 121 set on the push screw hole 12 has three functions: first, reducing the tapping length and difficulty: the existence of the first light hole 121 can reduce the overall depth of the first threaded hole 122 while ensuring the effective screwing length of the thread, thereby reducing the tapping time and difficulty. This design is particularly effective for long bolt connections because it reduces the difficulty of thread processing coaxiality; secondly, the light rod 23 set at the front end of the push screw 20 can cooperate with the first light hole 121 to realize the pre-installation of the push screw 20, so that the push screw 20 can be stably placed in the corresponding push screw hole 12 after the human hand releases its grip, which plays an auxiliary installation role for the subsequent rotational installation of the push screw 20 and improves the installation speed; thirdly, when the light rod 23 of the push screw 20 cooperates with the first light hole 121, based on the contact of both of them with non-threaded sections, after the light rod of the push screw 20 is located in the push screw hole 12, the thread of the external threaded rod 22 on the push screw 20 avoids damage to its thread caused by excessive contact with the inner wall of the first light hole 121; the entire structure makes the disassembly and assembly operation simple and convenient, without the need for special tools, low cost, high preload force, and the ability to adjust the overall stable preload force by step-by-step adjustment of the push screw 20, thereby ensuring safe and stable operation of the equipment.

[0036] Specifically, since the pre-tightening force is dispersed to multiple smaller push screws 20, the required tightening torque is kept at a low level, which makes it easy to achieve high pre-tightening force even when corresponding components with large diameters (such as bolts, etc.) are used; the entire structure is simple, and can achieve efficient and accurate pre-tightening force application, ensuring the firmness of the fasteners, which not only improves work efficiency, but also reduces operational difficulty, bringing significant convenience to industrial production.

[0037] Among them, the relevant structural settings of the main nut 10 are:

[0038] Specifically, the shape of the main nut 10 includes but is not limited to a cylindrical shape.

[0039] Specifically, the perpendicularity between the axis of the central connecting threaded hole 11 of the main nut 10 and its two end surfaces is greater than 0.05 mm.

[0040] Specifically, the parallelism between the axis of the central connecting threaded hole 11 of the main nut 10 and the axis of each push screw hole 12 is greater than 0.05 mm.

[0041] In the optional solution of this embodiment, it is more preferred that each push screw hole 12 is evenly spaced around the axis of the central connecting threaded hole 11. Each push screw hole 12 is evenly spaced at the circumferential position of the central connecting threaded hole 11, so that each push screw 20 can be evenly stressed, ensuring a good pre-tightening effect.

[0042] In the optional scheme of this embodiment, it is more preferred that the surface of the main nut 10 has a surface treatment layer of rust-proof or corrosion-resistant coating. The provision of the surface treatment layer of rust-proof or corrosion-resistant coating can prevent the metal material from contacting with external corrosive media (such as moisture, oxygen, chemicals, etc.), thereby avoiding or slowing down the rust and corrosion of the metal material, and significantly improving its service life and reliability, especially in harsh environments such as humidity and corrosion.

[0043] In the optional solution of this embodiment, it is more preferred that the hardness of the main nut 10 is lower than that of the jacking screw 20. The hardness of the main nut 10 is set to be lower than that of the jacking screw 20, so that the jacking screw 20 can be easily removed from the main nut 10 even if the lubrication is not good; and because the jacking screw 20 has a high hardness, it is not easy to break or be damaged when it is subjected to the jacking force, thereby ensuring the stability and reliability of the entire structure.

[0044] Specifically, the hardness of the main nut 10 is 10-15 HRC lower than the hardness of the jack screw 20 .

[0045] Among them, the relevant structural settings of the push screw 20 are as follows:

[0046] Among the optional solutions of this embodiment, it is more preferred that Figure 3 As shown, a spherical protrusion 24 is fixedly arranged at one end of the smooth rod 23 away from the external threaded rod 22. The provision of the spherical protrusion 24 can ensure that each jacking screw 20 and the washer 30 always maintain a good jacking effect; and the spherical protrusion 24 can make the jacking screw 20 more smoothly inserted into the corresponding jacking screw hole 12, thereby improving the installation efficiency.

[0047] Specifically, the sector angle of the spherical protrusion 24 in the first section is 110 degrees, and the first section refers to a plane that coincides with the axis of the push screw 20 .

[0048] Specifically, the screw head 21 of the push screw 20 includes a bolt head 211 and a head lower flange 212 . The head lower flange 212 is located between the bolt head 211 and the external threaded rod 22 , and is fixedly connected to both of them.

[0049] Specifically, the surface roughness of the external threaded rod 22 of the jack screw 20 is below Rz0.8.

[0050] Specifically, the strength grade of the push screw 20 is above grade 12.9.

[0051] Specifically, the coaxiality between the axis of the jacking screw 20 and the support surface under the head is greater than 0.05 mm.

[0052] Specifically, the push screw 20 can be surface treated to make it self-lubricating, wear-resistant and corrosion-resistant; since the lubrication is well controlled and the friction loss is minimized, it can achieve extremely high preload accuracy and repeatability.

[0053] Specifically, the shape of the end of the screw head 21 of the jack screw 20 can be set to include but not limited to an outer hexagon.

[0054] Specifically, the multi-thrust fastening nut 100 provided in this embodiment only requires a torque wrench or even a common wrench to tighten each thrust screw 20 step by step, and can also achieve an extremely high pre-tightening force.

[0055] Among them, the material selection instructions for each component are as follows:

[0056] Specifically, the materials of each component can be selected from but not limited to the following materials:

[0057] Among the optional schemes of this embodiment, it is more preferred that the material of the main nut 10 is medium carbon CrMo steel; the material of the push screw 20 is medium carbon CrNiMo steel; and the material of the washer 30 is cemented carbide. Medium carbon CrMo steel has high yield strength and tensile strength, while maintaining good toughness, which makes the main nut 10 not easy to break or deform when subjected to high loads and impacts, ensuring the stability and reliability of the connection; medium carbon CrNiMo steel provides high strength and excellent toughness through reasonable carbon content and addition of alloy elements. This makes the push screw 20 not easy to break when subjected to high loads, and can maintain stable performance under impact and vibration conditions; cemented carbide has extremely high hardness and wear resistance, which makes the washer 30 not easy to wear or damage when subjected to push force and friction, which helps to maintain the long-term stability and reliability of the washer 30, thereby ensuring overall performance.

[0058] Among them, regarding other instructions:

[0059] Specifically, regarding material selection: materials with high strength, high wear resistance and good corrosion resistance are selected to manufacture the multi-thrust fastening nut 100. This can ensure that the multi-thrust fastening nut 100 is not easily deformed or damaged when subjected to high pre-tightening force, and can work stably for a long time in harsh environments.

[0060] Specifically, regarding the manufacturing process technology: the various components of the multi-thrust fastening nut 100 adopt advanced manufacturing processes and equipment to ensure processing accuracy and quality; the manufacturing process includes forging, heat treatment, machining and surface treatment, and each link must strictly control process parameters and quality standards to ensure the performance and reliability of the components.

[0061] Specifically, regarding preload control: the preload can be evenly distributed and effectively transmitted by precisely controlling the tightening torque and preload of the multi-thrust fastening nut 100. Professional tightening equipment and monitoring tools are used to monitor and adjust the tightening process of the multi-thrust fastening nut 100 in real time.

[0062] The present invention uses specific examples to illustrate the principle and implementation of the present invention. The above examples are only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A multi-thrust fastening nut, characterized in that: Includes a main nut, a plurality of jack screws and washers; A central connecting threaded hole is provided in the middle of the main nut; and a plurality of through-going push screw holes are arranged in the circumference of the central connecting threaded hole; The push screw hole includes a first light hole and a first threaded hole; one end of the first light hole is connected and communicated with one end of the first threaded hole; the inner diameter of the first light hole is larger than the inner diameter of the first threaded hole; The push screw comprises a screw head, an externally threaded rod and a polished rod; the screw head is used to be rotated by a rotating tool, the screw head is fixedly arranged at one end of the externally threaded rod, and one end of the polished rod is fixedly connected to an end of the externally threaded rod away from the screw head; the outer diameter of the polished rod is smaller than the outer diameter of the externally threaded rod; A through hole is provided in the middle of the gasket; The washer is used to be placed on the side of the main nut having the first threaded hole, and the through hole corresponds to the central connecting threaded hole; the external threaded rod of the push screw is used to be threadedly connected to the first threaded hole of the push screw hole, and the push screw has one end of the smooth rod passing through the first smooth hole of the push screw hole and the first threaded hole, and then abuts against the side of the washer close to the main nut.

2. The multi-thrust fastening nut according to claim 1, characterized in that: A spherical protrusion is fixedly provided on one end of the polished rod away from the external threaded rod.

3. The multi-thrust fastening nut according to claim 1, characterized in that: The hardness of the main nut is lower than the hardness of the jack screw.

4. The multi-thrust fastening nut according to claim 1, characterized in that: The main nut is made of medium carbon CrMo steel; the push screw is made of medium carbon CrNiMo steel; and the washer is made of hard alloy.

5. The multi-thrust fastening nut according to claim 1, characterized in that: The surface of the main nut has a surface treatment layer of rust-proof or corrosion-resistant coating.

6. The multi-thrust fastening nut according to claim 1, characterized in that: The push screw holes are evenly spaced around the axis of the central connecting threaded hole.

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