Lock bolt structure of mining machinery

Abstract

The utility model relates to the technical field of bolt looseness prevention, in particular to a lock bolt structure of mining machinery. The bolt comprises a bolt body, a fastening nut assembly, a disc-shaped gasket and a locking nut assembly. In the specific use process, a structural part penetrates through the screw rod and is fixed between the fastening nut assembly and the head of the bolt, then the dish-shaped teeth of the two dish-shaped washers are placed in the clamping ring in an attached mode, the clamping ring is clamped in the clamping ring by screwing the fastening nut assembly, and the clamping ring is in close contact with the dish-shaped washers and the fastening nut. When the fastening nut assembly tends to loosen, the locking nut assembly stops the fastening nut assembly from loosing, and the clamping plate is clamped in the clamping ring, so that the fastening nut assembly and the locking nut assembly cannot be away from each other; meanwhile, the convex blocks and the dish-shaped teeth are arranged on the dish-shaped gasket, so that the locking nut assembly is more effectively prevented from loosening and retreating, and the stability of the anti-loosening bolt structure of the mining machinery when the anti-loosening bolt structure is used on the mining machinery is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of bolt loosening prevention, and particularly to a loosening prevention bolt structure for mining machinery. Background Technique

[0002] Loosening prevention bolts are mainly used to control the loosening failure of connecting components operating under vibration conditions. Especially for mechanical equipment such as mining machinery under vibration working conditions, measures need to be taken to prevent component loosening and affect the normal operation of mechanical connecting components. Currently, commonly used fastener loosening prevention methods include: friction loosening prevention, mechanical loosening prevention, riveting and punching loosening prevention. Among them, friction loosening prevention uses the method of increasing friction to prevent thread loosening. The increase in friction can be obtained by pressing the thread pair or by pressing the supporting surface. Friction loosening prevention is currently the most widely used. For example, using elastic washers, opposed nuts, eccentric nuts, etc. are all this method. The loosening prevention scheme of increasing friction is not restricted by space and can be disassembled repeatedly, but the reliability is poor. After working for a certain period of time, the loosening prevention effect will be reduced due to reasons such as vibration. Currently, there is a method using the Tang thread structure to prevent thread loosening. When using the Tang thread structure for connection, nuts with two different helix directions, left and right, are used. The nut on the supporting surface of the connected part is called the fastening nut, and the nut on the non-supporting surface is called the locking nut. Among them, the thread helix directions of the fastening nut and the locking nut are opposite. When in use, first tighten the fastening nut, and then tighten the locking nut. Under vibration and impact conditions, the fastening nut will tend to loosen. However, since the loosening direction of the fastening nut is the tightening direction of the locking nut, the tightening of the locking nut exactly prevents the loosening of the fastening nut, thereby preventing the bolt from loosening. However, during the use of mining machinery, due to usually being in high-load, high-temperature, and high-impact frequency use scenarios, when the load borne by the bolt is too large and the thread force exceeds the material yield strength, plastic deformation occurs, resulting in an increase in the gap between the two nuts, thereby reducing the bolt loosening prevention effect. In view of this, we propose a bolt fastening and loosening prevention structure and method with good loosening prevention effect and relatively simple structure. Content of the Utility Model

[0003] The purpose of the utility model is to provide a loosening prevention bolt structure for mining machinery to solve the problems raised in the above background technique.

[0004] To achieve the above object, the present utility model provides a loosening-preventing bolt structure for mining machinery, which includes a bolt, a fastening nut assembly and a locking nut assembly. The bolt includes a bolt head and a screw rod. The fastening nut assembly is located between the locking nut assembly and the bolt head. The fastening nut assembly and the locking nut assembly are arranged on the screw rod. The locking nut assembly is away from the bolt head. The fastening nut assembly and the locking nut assembly have opposite thread rotation directions and are screwed tightly in the opposite directions on the Tang's thread of the screw rod. The fastening nut assembly includes a fastening nut. A plurality of snap rings are fixedly installed on one side of the fastening nut away from the bolt head. The locking nut assembly includes a clamping plate. A locking nut is fixedly installed on one side of the clamping plate close to the bolt head. The clamping plate is tightly clamped in the clamping bars inside the plurality of snap rings.

[0005] As a further improvement of this technical solution, there is a gap between the plurality of snap rings. An annular structure with a narrower upper part and a wider lower part is arranged on the inner wall of the snap ring. The snap ring presses the clamping plate inward.

[0006] As a further improvement of this technical solution, the locking nut is in a boss shape. The side of the locking nut in contact with the clamping plate is slightly wider than the clamping plate.

[0007] As a further improvement of this technical solution, a pair of disc washers is arranged between the fastening nut assembly and the locking nut assembly. The disc teeth with opposite rotation directions are arranged on the sides of the pair of disc washers close to each other.

[0008] As a further improvement of this technical solution, a plurality of grooves are opened on the side of the fastening nut away from the bolt head. A plurality of grooves are opened on the side of the clamping plate close to the bolt head. A plurality of protrusions are arranged on the sides of the pair of disc washers away from each other. And the rotation directions of the plurality of protrusions on the pair of disc washers are opposite. The plurality of protrusions on the disc washer close to the fastening nut assembly are embedded in the plurality of grooves arranged on the fastening nut. The plurality of protrusions on the disc washer close to the locking nut assembly are embedded in the plurality of grooves arranged on the clamping plate.

[0009] Compared with the prior art, the beneficial effects of the present utility model are:

[0010] In the anti-loosening bolt structure of the mining machinery, the connecting piece is fixed between the fastening nut assembly and the bolt head by the provided through-fastening nut assembly. When the fastening nut tends to loosen, since the loosening direction of the fastening nut (counterclockwise direction) is the tightening direction of the locking nut (counterclockwise direction), the tightening of the locking nut just prevents the fastening nut from loosening. When the anti-loosening bolt structure of the mining machinery is tightened, a plurality of protrusions on a disc washer close to the fastening nut assembly are embedded in a plurality of grooves provided in the fastening nut, and a plurality of protrusions on a disc washer close to the locking nut assembly are embedded in a plurality of grooves provided in the clamping plate. The disc teeth provided on the adjacent sides of the disc washers bite each other to make the fastening nut assembly and the locking nut assembly rotate in linkage. Since the clamping plate is tightly clamped in the clamping ring, the fastening nut assembly and the locking nut assembly cannot have a tendency to move away from each other, so that the position of the anti-loosening bolt structure of the mining machinery on the screw is relatively fixed, ensuring that the bolt structure will not loosen when used in a mining scene. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0012] Figure 2 It is a schematic diagram of the structure of the nut part of the utility model;

[0013] Figure 3 It is an exploded schematic diagram of the overall structure of the utility model.

[0014] The meanings of several symbols in the figure are:

[0015] 1. Bolts;

[0016] 2. Fastening nut assembly; 21. Fastening nut; 22. Snap ring;

[0017] 3. Belleville Washer

[0018] 4. Locking nut assembly; 41. Clamping plate; 42. Locking nut. DETAILED DESCRIPTION

[0019] 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.

[0020] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0021] Example 1

[0022] See also Figures 1-3 As shown, this embodiment provides a bolt structure for preventing loosening of mining machinery, including a bolt 1, a fastening nut assembly 2 and a locking nut assembly 4 are arranged on one side of the bolt 1, the fastening nut assembly 2 is located between the bolt head and the locking nut assembly 4, the fastening nut assembly 2 and the locking nut assembly 4 have opposite thread rotation directions, and are sleeved on a screw rod provided with a Tang thread, by rotating the fastening nut assembly 2 and the locking nut assembly 4, the fastening nut assembly 2 and the locking nut assembly 4 are rotated toward the bolt head, and the thread is locked by using the Principle: Fix the connecting piece between the fastening nut assembly 2 and the bolt head. A fastening nut 21 is provided on the side of the fastening nut assembly 2 close to the bolt head, and a snap ring 22 is provided on the side away from the bolt head. Pass the connecting piece through the screw rod, rotate the fastening nut 21 clockwise to make the fastening nut assembly 2 pass through the screw rod. Pass the side with a protrusion of a disc washer 3 through the screw rod and place it in the snap ring 22. The protrusion on the disc washer 3 will be embedded in the groove on the fastening nut 21 when it rotates, and rotate in conjunction with the fastening nut assembly 2. The other disc washer 3 has a side with disc teeth that passes through the screw and is placed in the snap ring 22. The disc teeth between the two disc washers 3 will bite each other when rotating, so that the two disc washers 3 and the fastening nut assembly 2 rotate in conjunction. The locking nut assembly 4 is provided with a locking nut 42 on the side away from the bolt head. The locking nut 42 is fixedly installed with a clamping plate 41 on the side close to the bolt head. The screw is rotated counterclockwise to lock the nut 42, so that the clamping plate 41 is rotated toward the bolt head until the clamping plate 41 is clamped in the snap ring 22. At this time, a protrusion on a disc washer 3 close to the locking nut assembly 4 is embedded in the groove on the clamping plate 41, so that the locking nut assembly 4, the disc washer 3 and the fastening nut assembly 2 cannot be separated. When the fastening nut assembly 2 tends to loosen (rotates counterclockwise), the disc washer 3 allows the locking nut assembly 4 to generate a locking (counterclockwise) force, preventing the fastening nut assembly 2 from loosening, so that the bolt structure of the anti-loosening bolt of the mining machinery will not loosen when used in the mining scene, ensuring the normal use of the structure.

[0023] When the anti-loosening bolt structure of the mining machinery in this embodiment is specifically used, the structural member is passed through the screw rod and fixed between the fastening nut assembly 2 and the bolt head. Then, the dish-shaped teeth of the two dish-shaped washers 3 are closely placed against the snap ring 22. By tightening the locking nut assembly 4, the clamping plate 41 is clamped in the snap ring 22 and is in close contact with the dish-shaped washer 3 and the fastening nut 21. When there is a tendency for the fastening nut assembly 2 to loosen, the locking nut assembly 4 blocks the loosening and retraction of the fastening nut assembly 2. Since the clamping plate 41 is clamped in the snap ring 22, the fastening nut assembly 2 and the locking nut assembly 4 cannot move away from each other. At the same time, the bumps and dish-shaped teeth provided on the dish-shaped washer 3 more effectively enable the locking nut assembly 4 to block the loosening and retraction of the fastening nut assembly 2, ensuring the stability of the anti-loosening bolt structure of the mining machinery when used on the mining machinery.

[0024] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only preferred examples of the present invention and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A bolt structure for preventing loosening of mining machinery, comprising a bolt (1), a fastening nut assembly (2) and a locking nut assembly (4), wherein the bolt (1) comprises a bolt head and a screw rod, and the fastening nut assembly (2) is between the locking nut assembly (4) and the bolt head, characterized in that: A tightening nut assembly (2) and a locking nut assembly (4) are arranged on the screw rod. The locking nut assembly (4) is far away from the bolt head. The tightening nut assembly (2) and the locking nut assembly (4) have opposite thread rotation directions and are rotated in opposite directions on the Tang's thread of the screw rod to tighten. The tightening nut assembly (2) includes a tightening nut (21). A plurality of retaining rings (22) are fixedly mounted on the side of the tightening nut (21) away from the bolt head. The locking nut assembly (4) includes a clamping plate (41). A locking nut (42) is fixedly mounted on the side of the clamping plate (41) close to the bolt head. The clamping plate (41) is tightly clamped in the clamping strips in the plurality of retaining rings (22).

2. The anti-loosening bolt structure of mining machinery according to claim 1, characterized in that: Gaps are left between a plurality of the clamping rings (22), and an annular structure which is narrow at the top and wide at the bottom is provided on the inner wall of the clamping ring (22). The clamping ring (22) presses the clamping plate (41) inwardly.

3. The anti-loosening bolt structure of mining machinery according to claim 1, characterized in that: The locking nut (42) is in the shape of a boss, and the side of the locking nut (42) in contact with the clamping plate (41) is slightly wider than the clamping plate (41).

4. The anti-loosening bolt structure of mining machinery according to claim 1, characterized in that: A pair of disc-shaped washers (3) are arranged between the fastening nut assembly (2) and the locking nut assembly (4), and the adjacent sides of the pair of disc-shaped washers (3) are arranged with disc-shaped teeth with opposite rotation directions.

5. The anti-loosening bolt structure of mining machinery according to claim 4, characterized in that: The fastening nut (21) is provided with a plurality of grooves on a side away from the bolt head, the clamping plate (41) is provided with a plurality of grooves on a side close to the bolt head, a pair of disc washers (3) are provided with a plurality of protrusions on opposite sides thereof, and the plurality of protrusions on the pair of disc washers (3) rotate in opposite directions, a plurality of protrusions on a disc washer (3) close to the fastening nut assembly (2) are embedded in a plurality of grooves provided on the fastening nut (21), and a plurality of protrusions on a disc washer (3) close to the locking nut assembly (4) are embedded in a plurality of grooves provided on the clamping plate (41).

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