Locking dustproof nut

Abstract

The utility model belongs to the technical field of fastener, especially a locknut, including nut outer cover, nut inner cover, nut bottom ring, locknut cover, positioning pin and internal hexagonal taper end set screw, the nut outer cover coaxial setting is located nut inner cover outside, nut bottom ring is located nut outer cover bottom end, locknut cover is located nut outer cover top end, positioning pin is located between nut outer cover and locknut cover. The utility model design is reasonable, compact structure has good lock and dustproof performance, not only effectively promoted the stability of whole connection, can insulate the invasion of external dust and impurity simultaneously, effectively prolonged the service life of nut, and can positioning precision between reinforcing parts while avoiding the loosening phenomenon caused by vibration or external force, also convenient for convenient installation and disassembly, also can provide additional locking force when needed, ensure the reliability of equipment under complex working conditions.

Description

Technical Field

[0001] This utility model relates to the field of fastener technology, and in particular to an anti-loosening and dustproof nut. Background Technology

[0002] Threaded connections are a common fastening method, simple to manufacture and easy to install; nuts are used in conjunction with bolts and washers, and tightening and loosening are achieved by turning the nut with a tightening tool. However, this structure also has obvious disadvantages:

[0003] 1. Under heavy loads, severe friction will occur between the threads, which can easily damage the threads, making disassembly difficult and preventing reuse;

[0004] 2. There is intense friction between the contact surfaces of the nut and the connected parts, which may cause damage to both the nut itself and the connected parts.

[0005] 3. It may generate rotational torque, which often requires specific tools to counteract the rotational torque;

[0006] 4. The tightening method of ordinary nuts will generate an offset force on the bolt, which will affect the accuracy of the bolt preload. In the case of high requirements for uniform preload distribution, it is necessary to measure the elongation of each bolt to determine whether the load is uniform, which increases the workload. The offset force will also make the nuts and bolts subject to complex forces, which may damage the threaded pair in severe cases.

[0007] For example, the split-face connection of a steam turbine cylinder requires large bolts with high preload and very high uniformity. Steam turbine maintenance schedules are particularly tight, demanding rapid tightening and disassembly as well as reliable connections. While older nut-bolt connections can utilize simple hammering for preload, complex and time-consuming hot tightening, or expensive hydraulic wrench systems, these methods are unsatisfactory in terms of safety, speed, accuracy, and cost.

[0008] Therefore, this utility model proposes an anti-loosening and dustproof nut to solve the above problems.

[0009] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0010] The purpose of this utility model is to address the shortcomings mentioned in the background art and to propose an anti-loosening and dustproof nut.

[0011] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a nut anti-loosening and dustproof nut, comprising a nut outer sleeve, a nut inner sleeve, a nut bottom ring, a nut anti-loosening and dustproof nut cover, a locating pin, and an internal hexagonal cone-shaped set screw;

[0012] The outer sleeve of the nut is coaxially disposed on the outer side of the inner sleeve of the nut, the bottom ring of the nut is located at the bottom end of the outer sleeve of the nut, the anti-loosening and dustproof nut cover is located at the top end of the outer sleeve of the nut, the positioning pin is located between the outer sleeve of the nut and the anti-loosening and dustproof nut cover, and the internal hexagonal cone end set screw is located at the upper end of the anti-loosening and dustproof nut cover;

[0013] The inner upper part of the main body of the nut sleeve is provided with an internal spline that mates with the torque mechanism, and the outer lower part of the main body of the nut sleeve is provided with an external spline that mates with the bottom ring of the nut. The inner body of the nut sleeve is provided with an internal thread and an external thread.

[0014] The main body of the nut sleeve has six castle tooth grooves equidistantly arranged along the circumferential direction at one end for connecting with the anti-loosening and dustproof nut cover and torque mechanism. The castle tooth grooves are provided with two symmetrical semi-circular positioning holes. The main body of the nut sleeve is provided with an internal thread that matches the external thread of the nut inner sleeve.

[0015] Preferably, the bottom ring of the nut is provided with an inner spline that matches the outer spline of the inner sleeve body;

[0016] Preferably, the main body of the anti-loosening and dustproof nut cover is provided with six evenly distributed castle tooth grooves II that cooperate with the nut sleeve, and two symmetrical semi-circular positioning holes II are provided in the castle tooth grooves II. The upper end of the main body of the anti-loosening and dustproof nut cover is provided with four evenly distributed threaded holes.

[0017] Preferably, the positioning pin mates with the positioning hole one of the nut outer sleeve and the positioning hole two of the anti-loosening and dustproof nut cover;

[0018] Preferably, the internal hexagonal tapered set screw mates with the threaded hole of the anti-loosening and dustproof nut cover.

[0019] Preferably, the inner nut sleeve and the outer nut sleeve are connected by a trapezoidal thread, and the lower part of the inner nut sleeve is connected to the bottom ring of the nut by an involute spline.

[0020] Preferably, the thread type and specification of the inner thread of the nut inner sleeve are consistent with the corresponding screw thread.

[0021] Preferably, both the external thread of the inner sleeve of the nut and the internal thread of the outer sleeve of the nut are trapezoidal threads.

[0022] Preferably, both the outer spline of the main body of the nut inner sleeve and the inner spline of the bottom ring of the nut bottom ring are involute splines.

[0023] Preferably, the locating pin passes through the first locating hole and the second locating hole to form an interference fit, thereby restricting the relative rotation between the outer nut sleeve and the anti-loosening and dustproof nut cover.

[0024] Preferably, the tapered ends of the four internal hexagonal set screws are all embedded in the upper end face of the nut sleeve, forming a mechanical anti-loosening structure.

[0025] Preferably, the lower end face of the anti-loosening and dustproof nut cover and the upper end face of the nut sleeve are sealed together by a locating pin.

[0026] Preferably, the torque mechanism is a hydraulic tension wrench or other equivalent torque application device.

[0027] Preferably, the outer nut sleeve, inner nut sleeve, bottom nut ring, and anti-loosening and dustproof nut cover are all made of alloy steel and have been galvanized.

[0028] The beneficial effects of this utility model are:

[0029] Through the above structural design, this utility model effectively solves the problems of traditional nuts being prone to loosening and damage under heavy loads, as well as being complex to operate. Its anti-loosening performance is significantly improved, meeting the requirements of high-precision preload uniform distribution. It also has good dustproof effect, making it suitable for harsh working environments. In addition, the modular design of this nut makes installation and disassembly more convenient, requiring no complicated tools, which greatly improves work efficiency. The precise fit between the components not only enhances the reliability of the connection but also extends the service life of the nut and reduces maintenance costs. This innovative design is particularly suitable for applications with high requirements for fastening safety, speed, and accuracy, such as the split-face connection of a steam turbine cylinder, providing a strong guarantee for the efficient operation of industrial equipment. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a three-dimensional structural diagram of an anti-loosening and dustproof nut proposed in this utility model;

[0032] Figure 2 The diagram shows the (A) front view, (B) top view, and (C) left view of the nut sleeve structure;

[0033] Figure 3 The diagram shows the (A) front view and (B) left view of the inner sleeve of the nut.

[0034] Figure 4 The diagram shows the (A) front view and (B) left view of the bottom ring of the nut.

[0035] Figure 5 The diagram shows the structure of the dustproof nut cover from (A) front view, (B) top view, and (C) left view.

[0036] In the picture:

[0037] 1. Nut inner sleeve; 1a. Body internal spline; 1b. Body external spline; 1c. Internal thread one; 1d. External thread;

[0038] 2. Nut outer sleeve; 2a. Castle tooth groove one; 2b. Positioning hole one; 2c. Internal thread two;

[0039] 3. Nut base ring; 3a. Inner spline of the base ring;

[0040] 4. Positioning pin;

[0041] 5. Anti-loosening and dustproof nut cover; 5a. Castle tooth groove two; 5b. Positioning hole two; 5c. Threaded hole;

[0042] 6. Hexagonal taper set screw. Detailed Implementation

[0043] The technical solution of this utility model will now be clearly and completely described with reference to specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0044] Reference Figure 1-5 A type of anti-loosening and dustproof nut, comprising

[0045] Nut Inner Sleeve 1: The main body of the nut inner sleeve 1 is a hollow cylindrical structure. The inner spline 1a on the upper inner side adopts a standard spline tooth design, which is precisely matched with the spline shaft of the torque mechanism such as the hydraulic tension wrench to ensure efficient torque transmission. The outer spline 1b on the lower outer side is adapted to the inner spline 3a of the bottom ring of the nut bottom ring 3. It adopts an involute spline, which has the characteristics of strong load-bearing capacity and high centering accuracy, ensuring connection stability. The internal thread 1c inside the main body is machined according to the thread standard of the corresponding screw, and the external thread 1d is a trapezoidal thread. The trapezoidal thread has high transmission efficiency and good wear resistance, and is suitable for occasions that bear large axial forces.

[0046] Nut sleeve 2: Nut sleeve 2 is a ring-shaped sleeve structure. Six castle tooth grooves 2a are evenly distributed along the circumference at one end. The shape of the grooves matches the castle tooth grooves 5a of the anti-loosening and dustproof nut cover 5. The positioning hole 2b on the side of the groove is used to install the positioning pin 4. The internal thread 2c inside the main body matches the external thread 1d of the inner sleeve 1 of the nut. Through precise thread processing technology, it is ensured that the two are coaxially assembled and have a suitable preload.

[0047] Nut bottom ring 3: Nut bottom ring 3 is annular, and the inner spline 3a of the bottom ring is also an involute spline, which cooperates with the outer spline 1b of the main body of the nut inner sleeve 1 to restrict the circumferential rotation of the nut inner sleeve 1, while bearing the axial force when the nut is tightened.

[0048] Anti-loosening and dustproof nut cover 5: The anti-loosening and dustproof nut cover 5 has a cap-shaped structure. The six castle tooth grooves 2a at the lower end of the main body engage with the castle tooth groove 1a at the outer sleeve of the nut 2. After the positioning hole 2b is aligned with the positioning hole 1b, the positioning pin 4 can be inserted. The four threaded holes 5c at the upper end are evenly distributed and used to install the internal hexagonal cone end set screw 6.

[0049] Positioning pin 4: Positioning pin 4 is a cylindrical pin whose diameter is adapted to positioning hole 2b and positioning hole 5b. It is inserted into the hole by means of interference fit or transition fit to realize the positioning and fixation of nut outer sleeve 2 and anti-loosening dustproof nut cover 5, and prevent the two from rotating relative to each other.

[0050] Hexagonal tapered set screw 6: The hexagonal tapered set screw 6 is tightened with an Allen wrench. The tapered end is embedded in the upper end face of the nut sleeve 2. The axial force of the screw and the friction of the tapered surface form a mechanical anti-loosening structure to prevent the nut from loosening under vibration and other working conditions.

[0051] During assembly, first, connect the external thread 1d of the inner nut sleeve 1 with the internal thread 2c of the outer nut sleeve 2 using a special tool and tighten it to the specified torque to ensure that the two are coaxial and have appropriate preload, so that the outer nut sleeve 2 is coaxially positioned on the outside of the inner nut sleeve 1.

[0052] Next, the bottom ring 3 of the nut is splined to the outer spline 1b of the main body at the lower end of the inner sleeve 1 of the nut through the inner spline 3a of the bottom ring. The two are fully engaged by axial movement, and the bottom ring 3 of the nut is fixed to the bottom end of the outer sleeve 2 of the nut.

[0053] Then, align and engage the castle tooth groove 5a of the anti-loosening dustproof nut cover 5 with the castle tooth groove 2a of the nut outer sleeve 2. At this time, the positioning hole 5b and the positioning hole 2b are also aligned. Insert the positioning pin 4 into the positioning hole to restrict the relative rotation between the anti-loosening dustproof nut cover 5 and the nut outer sleeve 2, so that the anti-loosening dustproof nut cover 5 is located at the top of the nut outer sleeve 2.

[0054] Finally, use an Allen wrench to screw the Allen head tapered set screw 6 into the threaded hole 5c at the upper end of the anti-loosening and dustproof nut cover 5, so that the tapered end of the set screw 6 is embedded in the upper end face of the nut sleeve 2, thus completing the assembly of the entire nut.

[0055] During work:

[0056] Tightening the nut: Install the anti-loosening and dustproof nut onto the screw to be tightened, so that the internal thread of the inner nut sleeve 1, 1c, mates with the screw thread. Use a torque mechanism such as a hydraulic tension wrench to connect with the spline 1a of the inner nut sleeve 1 or the grooving groove 2a of the outer nut sleeve 2. Apply torque, and the inner nut sleeve 1 moves along the screw axis through the thread drive, driving the outer nut sleeve 2, the bottom ring 3 of the nut, and the anti-loosening and dustproof nut cover 5 to tighten together, thereby achieving the fastening of the connected parts.

[0057] Anti-loosening and dustproof: After the nut is tightened, the locating pin 4 restricts the relative rotation of the anti-loosening and dustproof nut cover 5 and the nut outer sleeve 2. The conical end of the internal hexagonal tapered set screw 6 is embedded in the nut outer sleeve 2 to form a mechanical anti-loosening structure, which effectively prevents the nut from loosening. At the same time, the anti-loosening and dustproof nut cover 5 and the nut outer sleeve 2 form a sealed fit through the locating pin 4 to block dust and impurities from entering the nut, thus playing a dustproof role and ensuring that the nut can still work reliably in harsh environments.

[0058] The above provides a detailed description of the anti-loosening and dustproof nut provided by this utility model. Specific embodiments have been used to illustrate the principle and implementation of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that those skilled in the art can make several improvements and modifications to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A type of anti-loosening and dustproof nut, characterized in that, include: Nut outer sleeve (2), nut inner sleeve (1), nut bottom ring (3), anti-loosening and dustproof nut cover (5), locating pin (4) and internal hexagonal cone end set screw (6); The outer sleeve of the nut (2) is coaxially disposed on the outside of the inner sleeve of the nut (1), the bottom ring of the nut (3) is located at the bottom end of the outer sleeve of the nut (2), the anti-loosening and dustproof nut cover (5) is located at the top end of the outer sleeve of the nut (2), the positioning pin (4) is located between the outer sleeve of the nut (2) and the anti-loosening and dustproof nut cover (5), and the internal hexagonal cone end set screw (6) is located at the upper end of the anti-loosening and dustproof nut cover (5); The inner side of the upper end of the main body of the nut sleeve (1) is provided with an internal spline (1a) that cooperates with the torque mechanism, and the outer side of the lower end of the main body of the nut sleeve (1) is provided with an external spline (1b) that cooperates with the nut bottom ring (3). The inner side of the main body of the nut sleeve (1) is provided with an internal thread (1c) and an external thread (1d). The main body of the nut sleeve (2) has six castle tooth grooves (2a) at equal intervals along the circumference for connecting with the anti-loosening and dustproof nut cover (5) and torque mechanism. The castle tooth groove (2a) has two symmetrical semi-circular positioning holes (2b). The main body of the nut sleeve (2) has an internal thread (2c) that matches the external thread (1d) of the nut inner sleeve (1). The bottom ring (3) of the nut is provided with an inner spline (3a) that matches the outer spline (1b) of the main body of the inner sleeve (1); The main body of the anti-loosening and dustproof nut cover (5) is provided with six evenly distributed castle tooth grooves (5a) that cooperate with the nut sleeve (2). The castle tooth grooves (5a) are provided with two symmetrical semi-circular positioning holes (5b). The upper part of the main body of the anti-loosening and dustproof nut cover (5) is provided with four evenly distributed threaded holes (5c). The positioning pin (4) is engaged with the positioning hole 1 (2b) of the nut sleeve (2) and the positioning hole 2 (5b) of the anti-loosening and dustproof nut cover (5); The internal hexagonal tapered set screw (6) engages with the threaded hole (5c) of the anti-loosening and dustproof nut cover (5).

2. The anti-loosening and dustproof nut according to claim 1, characterized in that, The inner nut sleeve (1) and the outer nut sleeve (2) are connected by a trapezoidal thread, and the lower part of the inner nut sleeve (1) is connected to the bottom ring of the nut (3) by an involute spline.

3. The anti-loosening and dustproof nut according to claim 1, characterized in that, The thread type and specification of the internal thread 1c of the nut inner sleeve (1) are consistent with the corresponding screw thread.

4. The anti-loosening and dustproof nut according to claim 1, characterized in that, The external thread (1d) of the inner sleeve of the nut (1) and the internal thread (2c) of the outer sleeve of the nut (2) are both trapezoidal threads.

5. The anti-loosening and dustproof nut according to claim 1, characterized in that, The outer spline (1b) of the main body of the inner sleeve of the nut (1) and the inner spline (3a) of the bottom ring of the nut (3) are both involute splines.

6. The anti-loosening and dustproof nut according to claim 1, characterized in that, The positioning pin (4) passes through the positioning hole one (2b) and the positioning hole two (5b) to form an interference fit, thereby restricting the relative rotation between the nut outer sleeve (2) and the anti-loosening and dustproof nut cover (5).

7. The anti-loosening and dustproof nut according to claim 1, characterized in that, The tapered ends of the four internal hexagonal tapered set screws (6) are all embedded in the upper end face of the nut sleeve (2) to form a mechanical anti-loosening structure.

8. The anti-loosening and dustproof nut according to claim 1, characterized in that, The lower end face of the anti-loosening and dustproof nut cover (5) and the upper end face of the nut outer sleeve (2) are sealed together by a positioning pin (4).

9. The anti-loosening and dustproof nut according to claim 1, characterized in that, The torque mechanism is a hydraulic tension wrench or other equivalent torque application device.

10. The anti-loosening and dustproof nut according to claim 1, characterized in that, The materials of the nut outer sleeve (2), nut inner sleeve (1), nut bottom ring (3) and anti-loosening and dustproof nut cover (5) are all alloy steel, and the surface is galvanized.

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