CN110848231A - Anti-loosening connecting pair - Google Patents

Abstract

The invention discloses an anti-loosening connection pair, which comprises an eccentric bolt, a backstop and a locking member. The eccentric bolt includes a screw part, and one end of the screw part is provided with an inner nut or an extension threadedly matched with the locking member. Bolts, the inner nut or the extension bolt and the axis of the screw portion are not on the same line; the backstop is sleeved on the screw portion, and the backstop is provided on the side facing the locking piece. There is a protruding part, the protruding part is provided with a C-shaped bayonet, and the locking piece abuts against the backstop and is snapped into the C-shaped bayonet. When the machine on which the connecting pair is installed is in a state of high frequency vibration, the locking of the connecting pair of the present invention is more firm and stable due to the existence of multiple functions.

Description

An anti-loose connection pair

technical field

The invention belongs to the technical field of fasteners, and in particular relates to an anti-loosening connecting pair.

Background technique

Mechanical equipment is usually connected by threads, and most of the fasteners are connected by ordinary bolts and nuts, that is, ordinary bolt pairs. For metal structural products that need to be dismantled and assembled frequently, it provides convenience in disassembly and assembly. However, this connection method is prone to loosening in the environment of mechanical vibration and variable load. In the prior art, the way of increasing the friction force makes the machine loosen or prevents the loosening between the bolts and nuts, and the commonly used ways to increase the friction force are adding spring nuts or double nuts, inserting nylon washers, setting concave cones, or applying adhesive. However, the nut will be loose within a certain gap, the reuse rate is low, and the installation conditions are greatly restricted, resulting in extremely unstable existing threaded connection methods.

Utility model patent CN 203809476 U discloses an anti-loosening nut, comprising a nut body with a main threaded hole, a self-locking sleeve with a self-locking threaded hole, an eccentric boss extending upward on the upper end face of the nut body, the eccentric boss The central axis of the self-locking sleeve has an eccentric distance from the central axis of the main threaded hole, the lower end surface of the self-locking sleeve has an eccentric stop hole sleeved on the eccentric boss, the central axis of the eccentric stop hole and the central axis of the eccentric boss Coincidence, there is friction between the inner peripheral wall of the eccentric stop hole and the outer peripheral wall of the eccentric boss. In the initial state that the self-locking sleeve is set on the eccentric boss, the central axis of the self-locking threaded hole coincides with the central axis of the main threaded hole. At the same time, there is a gap between the upper end face of the eccentric boss and the top wall of the eccentric stop hole. When the self-locking sleeve is deflected by an angle relative to the eccentric boss, the central axis of the self-locking threaded hole and the central axis of the main threaded hole Offset, due to the existence of the offset, the self-locking sleeve and the nut cylinder are locked together, which enhances the anti-loosening effect.

Ordinary eccentric bolts can meet the installation requirements of stationary or no high-frequency operation devices, but they are often in a state of high-frequency vibration during mechanical operation. Using ordinary eccentric bolts for connection is easy to loose and fall off due to high-frequency mechanical vibration. Accidents may even occur.

SUMMARY OF THE INVENTION

In view of the deficiencies of the prior art, the present invention solves the technical problem that the bolted connection pair is easily loosened or even falls off under the high-frequency vibration state during operation of the mechanical equipment by providing an anti-loosening connection pair.

For achieving the above object, the technical scheme of the present invention is:

An anti-loosening connection pair includes an eccentric bolt, a locking bolt and a backstop, the eccentric bolt includes a screw portion and an inner nut, the backstop is sleeved on the screw portion, and the inner nut is opened at the screw portion. The groove at one end of the screw portion, the central axis of the screw portion and the central axis of the inner nut are not on the same line; and a bolt portion (230), the bolt portion (230) is threadedly connected with the inner nut; the side of the backstop facing the boss portion I is provided with a convex portion, and a convex portion is provided on the convex portion There is a C-shaped bayonet, and the boss portion I of the locking bolt abuts against the backstop and snaps into the C-shaped bayonet.

Further, the outer wall of the screw part is provided with an external thread I, the inner wall of the inner nut is provided with an internal thread I, and the rotation direction of the external thread I and the internal thread I is opposite; There is an external thread II with the same rotation direction as the internal nut.

Preferably, the external thread I is a right-hand thread, the internal thread I is a left-hand thread, and the external thread II is a left-hand thread.

Preferably, a tooth-shaped protrusion I is provided on the side of the boss portion I of the locking bolt facing the backstop.

An anti-loosening connection pair includes an eccentric bolt, a locking nut and a backstop, the eccentric bolt includes an integral screw portion and an extension bolt, the backstop is sleeved on the screw portion, and the screw portion The central axis of the bolt is not on the same line as the central axis of the extension bolt; the locking nut includes a flange portion II, a boss portion II and a nut portion that are coaxially arranged, and the nut portion passes through the flange portion. At the axial centers of the flange portion II and the boss portion II, the nut portion is threadedly connected with the extension bolt; the backstop member is provided with a convex portion on the side facing the boss portion II, and the convex portion is There is a C-shaped bayonet on the part, and the boss portion II of the locking nut abuts against the backstop and is snapped into the C-shaped bayonet.

Further, the outer wall of the screw portion is provided with an external thread I, the outer wall of the extension bolt is provided with an external thread III, and the rotation direction of the external thread I and the external thread III is opposite; the inside of the locking nut There is an internal thread III with the same rotation direction as the extension bolt.

Preferably, the external thread I is a right-hand thread, the external thread III is a left-hand thread, and the internal thread III is a left-hand thread.

Preferably, a tooth-shaped protrusion II is provided on the side of the boss portion II of the locking nut facing the backstop.

Preferably, the backstop member is a backstop nut, and the backstop nut is provided with an internal thread II that is rotated in the same direction as the screw portion.

Preferably, the backstop member is a backstop washer, and the backstop washer is sleeved on the screw portion of the eccentric bolt through interference fit.

Preferably, the eccentric bolt further includes a nut, and the nut is located at one end away from the inner nut or the extension bolt.

Further, a method for installing a connecting pair includes the following steps:

(1) A mounting hole A and a mounting hole B are reserved on the component A and component B that need to install the connection pair on the high-frequency vibration machine, and the inner wall of the mounting hole B is provided with a screw thread with the outer wall of the screw part. To the same internal thread IV, the part B reserves a notch on the side away from the part A for limiting the offset of the backstop washer, and the shape and size of the notch are the same as the backstop. Gaskets match;

(2) Pass the screw portion of the eccentric bolt along the mounting hole A, and then unscrew it along the mounting hole B;

(3) Press the backstop washer into the slot, and set the backstop washer on the screw portion of the eccentric bolt; one end of the convex portion of the backstop washer faces outward, and the backstop The raised part of the gasket is annular;

(4) Use the existing flattening tool to cooperate with the eccentric bolt. The grinding head of the flattening tool is the same as the outer diameter of the boss part of the locking bolt or the locking nut. The part overlapping with the convex part of the backstop washer is ground to form the C-shaped bayonet;

(5) Tighten the locking bolt or the locking nut and the eccentric bolt, and make the locking bolt or the locking nut snap into the C-shaped bayonet, so that the The eccentric bolt is in a locked state with the locking bolt or the locking nut.

Compared with the prior art, the advantages of the present invention:

(1) The present invention discloses an eccentric anti-loosening screw. According to the principle of centrifugal motion, an inner nut or an extension bolt that deviates from the axis is added at one end of the screw part, and a matching locking bolt or locking bolt is installed through the connection. nut, thereby changing the axial active radius of one end of the screw part and increasing the frictional force of the connecting pair.

(2) The outer wall of the screw portion of the present invention is provided with a right-hand thread, and the locking bolt or locking nut is provided with a left-hand thread. Therefore, in the state of mechanical high-frequency vibration, the screw portion will generate an axial force toward the tightening member, and The locking bolt or locking nut will generate an axial force towards the screw part, so that the locking bolt or locking nut and the screw part will be in a more tight state. Therefore, this reverse thread setting method can Ensure the overall strength of the connection pair.

(3) In the present invention, a backstop is sleeved on the screw part, and the backstop is provided with a convex part on the side facing the tightening part, and the convex part is in abutment with the locking bolt or the locking nut There is a C-shaped bayonet, and the locking bolt or locking nut is stuck into the C-shaped bayonet in the locked state, so as to limit the displacement of the locking bolt or the locking nut, and make the connection pair locking more firmly and stably , not easy to loosen.

(4) In the present invention, a tooth-shaped protrusion is provided on the side of the locking bolt or locking nut facing the backstop, which can effectively increase the frictional force of the contact surface between the locking bolt or locking nut and the backstop, so that the lock can be locked. In the tight state, the tightening member is more difficult to displace, which further enhances the connection stability of the connecting pair.

To sum up, when the machine on which the connecting pair is installed is in a high-frequency vibration state, due to the presence of the outward force on the connecting pair, the high-frequency vibration makes the bolt and the locking bolt or the locking nut closer to bite. ; The tooth-like protrusions at the end of the locking bolt or locking nut further increase the friction between the contact surface of the locking bolt or the locking nut; the C-type bayonet can prevent the rotational deviation of the locking bolt or locking nut. The locking of the connecting pair of the present invention is more firm and stable.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Fig. 1 is the structural representation of the connection pair of embodiment 1;

Figure 2 is an enlarged schematic view of the structure of the backstop gasket of Embodiment 1;

3 is an enlarged schematic view of the installation state of the locking bolt and the backstop washer of Embodiment 1;

4 is an enlarged schematic view of the locking bolt and the backstop washer of Embodiment 1;

Fig. 5 is the enlarged structural schematic diagram of the backstop nut of embodiment 2;

Fig. 6 is the structural representation of the connection pair of embodiment 3;

Fig. 7 is the enlarged structural schematic diagram of the lock nut of embodiment 3;

8 is an enlarged schematic view of the installation state of the lock nut and the backstop washer of Embodiment 3;

Fig. 9 is the installation schematic diagram of embodiment 1;

Fig. 10 is the installation schematic diagram of embodiment 3;

Reference number:

100, eccentric bolt; 110, screw part; 111, external thread I; 120a, internal nut; 120a-1, internal thread I; 120b, extension bolt; 120b-1, external thread III; 130, nut;

200, locking bolt; 210, flange part I; 220, boss part I; 230, bolt part; 231, external thread II;

300, backstop; 310, raised part; 320, C-type bayonet; 330, internal thread II;

400, locking nut; 410, flange part II; 420, boss part II; 421, toothed protrusion II; 430, nut part; 431, internal thread III;

500, component A; 510, mounting hole A;

600, component B; 610, mounting hole B; 620, internal thread IV.

Detailed ways

The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

Example 1

As shown in Figures 1-4, an anti-loosening connection pair includes an eccentric bolt (100), a locking bolt (200) and a backstop (300), the backstop (300) is a thrust washer, so The eccentric bolt (100) includes a screw portion (110) and an inner nut (120a), the backlash washer is sleeved on the screw portion (110), and the inner nut (120a) is provided on the screw portion (110) a groove at one end, the central axis of the screw part (110) and the central axis of the inner nut (120a) are not on the same straight line. The locking bolt (200) is coaxially provided with a flange portion I (210), a boss portion I (220) and a bolt portion (230) that are connected in sequence, and the bolt portion (230) is connected to the inner nut (120a) ) threaded connection.

The outer wall of the screw part (110) is provided with an external thread I (111), the external thread I (111) is a right-hand thread, and the inner wall of the inner nut (120a) is provided with an internal thread I (120a- 1), the internal thread I (120a-1) is a left-handed thread, and the external thread I (111) and the internal thread I (120a-1) have opposite directions of rotation. The bolt portion (230) of the locking bolt (200) is provided with an external thread II (231) having the same rotation direction as the inner nut (120a), and the external thread II (231) is also a left-hand thread. Since the screw portion (110) of the eccentric bolt (100) is opposite to the rotation direction of the inner nut (120a), the axial outward force generated by the loosening of the connection pair under the mechanical high-frequency vibration, the outward action is utilized. The interaction of forces can well prevent the loosening of the connection pair.

The backstop washer is sleeved on the screw portion (110) of the eccentric bolt (100) through interference fit. A convex portion (310) is provided on the side of the backstop gasket facing the boss portion I (220), and a C-shaped bayonet (320) is provided on the convex portion (310). The boss portion I (220) of the stop bolt (200) abuts against the backstop washer and is clamped into the C-shaped bayonet (320). When the locking bolt (200) and the eccentric bolt (100) are screwed together, due to the eccentric design of the inner nut (120a) in the screw portion (110), the locking When the boss portion I (220) of the bolt (200) is in contact with the boss portion (310) of the backstop washer, a partial overlap occurs, and the C-shaped bayonet (320) is formed by grinding the overlapped portion. The design of the backstop gasket is often applied to mechanical parts that are provided with internal threads.

When the locking bolt (200) and the eccentric bolt (100) are in a tightened state (that is, the boss portion I (220) abuts against the back-stop washer), the protrusion of the locking bolt (200) The platform portion I (220) is snapped into the C-shaped bayonet (320), and the connection pair is in a locked state due to the existence of the axial outward force of the C-shaped bayonet (320) and the connection pair. Especially when the machine is in a state of high frequency vibration, the axial outward force makes the connection pair more firmly locked.

The side of the boss portion I (220) of the locking bolt (200) facing the backstop washer is provided with a tooth-shaped projection I (not shown in the figure) to increase the boss portion I (220). ) and the frictional force of the contact surface of the backstop gasket, so that the connecting pair is not easy to loosen under the state of mechanical high frequency vibration. In addition, in order to improve the connection effect of the connection pair, a composite coagulant is injected into the groove, which can further improve the overall strength and stability of the connection pair. The eccentric bolt (100) further includes a nut (130), the nut (130) is located at one end away from the inner nut (120a) or the extension bolt (120b), and the nut is installed in a movable installation manner (ie Blocked with nut (130)).

Example 2

Different from Embodiment 1, as shown in FIG. 5 , an anti-loosening connection pair includes an eccentric bolt (100), a locking bolt (200) and a backstop (300), the backstop (300) A backstop nut, the eccentric bolt (100) includes a screw portion (110) and an inner nut (120a), the backstop nut is sleeved on the screw portion (110), and the inner nut (120a) is opened at the In the groove at one end of the screw portion (110), the central axis of the screw portion (110) and the central axis of the inner nut (120a) are not on the same straight line. The locking bolt (200) is coaxially provided with a flange portion I (210), a boss portion I (220) and a bolt portion (230) that are connected in sequence, and the bolt portion (230) is connected to the inner nut (120a) ) threaded connection.

The outer wall of the screw part (110) is provided with an external thread I (111), the external thread I (111) is a right-hand thread, and the backstop nut is provided with a rotation direction of the screw part (110). The same internal thread II (330), the internal thread II (330) is a right-hand thread. The inner wall of the inner nut (120a) is provided with an inner thread I (120a-1), the inner thread I (120a-1) is a left-hand thread, and the outer thread I (111) and the inner thread I ( 120a-1) in the opposite direction. The bolt portion (230) of the locking bolt (200) is provided with an external thread II (231) having the same rotation direction as the inner nut (120a), and the external thread II (231) is also a left-hand thread. Since the screw portion (110) of the eccentric bolt (100) is opposite to the rotation direction of the inner nut (120a), the axial outward force generated by the loosening of the connection pair under the mechanical high-frequency vibration, the outward action is utilized. The interaction of forces can well prevent the loosening of the connection pair.

The side of the backstop nut facing the boss portion I (220) is provided with a protruding portion (310), and a C-shaped bayonet (320) is provided on the protruding portion (310), and the locking The boss portion I (220) of the bolt (200) abuts against the backstop nut and is snapped into the C-shaped bayonet (320). When the locking bolt (200) and the eccentric bolt (100) are screwed together, due to the eccentric design of the inner nut (120a) in the screw portion (110), the locking When the boss portion I (220) of the bolt (200) is in contact with the boss portion (310) of the backstop nut, a partial overlap occurs, and the C-shaped bayonet (320) is formed by smoothing the overlapped portion. The design of the backstop nut is often applied to mechanical parts that are not provided with internal threads.

When the locking bolt (200) and the eccentric bolt (100) are in a tightened state (that is, the boss portion I (220) abuts against the backstop nut), the boss of the locking bolt (200) The part I (220) is snapped into the C-shaped bayonet (320), and the connection pair is in a locked state due to the existence of the axial outward force of the C-shaped bayonet (320) and the connection pair. Especially when the machine is in a state of high frequency vibration, the axial outward force makes the connection pair more firmly locked.

The side of the boss portion I (220) of the locking bolt (200) facing the backstop nut is provided with a toothed projection I to increase the contact surface between the boss portion I (220) and the backstop nut. The friction force makes the connection pair not easy to loosen under the state of mechanical high frequency vibration. In addition, in order to improve the connection effect of the connection pair, a composite coagulant is injected into the groove, which can further improve the overall strength and stability of the connection pair. Compared with the movable installation method of Embodiment 1 (that is, there is a nut for blocking), the screw portion (110) is not provided with a nut (not shown in the figure), which can be used for fixed connection. Sub-installation method.

Example 3

Different from Embodiment 1, as shown in Figures 6-8, an anti-loosening connection pair includes an eccentric bolt (100), a locking nut (400) and a backstop (300), the backstop ( 300) Backstop washer, the eccentric bolt (100) includes an integral screw portion (110) and an extension bolt (120b), the backstop washer is sleeved on the screw portion (110), the screw The central axis of the part (110) and the central axis of the extension bolt (120b) are not on the same straight line. The locking nut (400) includes a flange portion II (410), a boss portion II (420) and a nut portion (430) coaxially provided with the nut portion (430) passing through the flange portion II ( 410 ) and the axial center of the boss portion II ( 420 ), the nut portion ( 430 ) is threadedly connected with the extension bolt ( 120 b ).

The backstop washer is sleeved on the screw portion (110) of the eccentric bolt (100) through interference fit. An external thread I (111) is provided on the outer wall of the screw portion (110), and the external thread I (111) is a right-hand thread. The outer wall of the extension bolt (120b) is provided with an external thread III (120b-1), the external thread I (111) and the external thread III (120b-1) have opposite directions of rotation, and the external thread III (120b-1) (120b-1) is a left-hand thread. The locking nut (400) is internally provided with an internal thread III (431) having the same rotation direction as the extension bolt (120b), and the internal thread III (431) is a left-handed thread. Since the screw portion (110) of the eccentric bolt (100) is opposite to the direction of rotation of the extension bolt (120b), the axial outward force generated by the loosening of the connection pair under the mechanical high-frequency vibration, the outward action is utilized. The interaction of forces can well prevent the loosening of the connection pair.

A convex portion (310) is provided on the side of the backstop gasket facing the boss portion II (420), and a C-shaped bayonet (320) is provided on the convex portion (310). The boss portion II (420) of the stop nut (400) abuts against the backstop washer and is snapped into the C-shaped bayonet (320). The side of the boss portion II (420) of the locking nut (400) facing the backstop washer is provided with a tooth-shaped projection II (421) to increase the contact surface between the boss portion and the backstop nut. The friction force makes the connection pair not easy to loosen under the state of mechanical high frequency vibration.

When the locking nut (400) and the eccentric bolt (100) are screwed together, due to the eccentric design of the extension bolt (120b) and the screw portion (110), the extended convex When the platform portion II (420) is in contact with the convex portion (310) of the backstop washer, a partial overlap occurs, and the C-shaped bayonet (320) is formed by grinding the overlapped portion flat. The design of the back-stop washer is often applied to mechanical parts with internal threads.

Example 4

Different from Embodiment 1, an anti-loosening connection pair includes an eccentric bolt (100), a locking nut (400) and a backstop (300), the backstop (300) is a thrust washer, so The eccentric bolt (100) includes an integral screw portion (110) and an extension bolt (120b), the backstop nut is sleeved on the screw portion (110), and the central axis of the screw portion (110) is connected to the screw portion (110). The central axes of the extension bolts (120b) are not on the same straight line. The locking nut (400) includes a flange portion II (410), a boss portion II (420) and a nut portion (430) coaxially provided with the nut portion (430) passing through the flange portion II ( 410 ) and the axial center of the boss portion II ( 420 ), the nut portion ( 430 ) is threadedly connected with the extension bolt ( 120 b ).

An external thread I (111) is provided on the outer wall of the screw portion (110), and the external thread I (111) is a right-hand thread. The backstop nut is provided with an internal thread II having the same rotation direction as the screw portion (110), and the internal thread II is a right-hand thread. The outer wall of the extension bolt (120b) is provided with an external thread III (120b-1), the external thread I (111) and the external thread III (120b-1) have opposite directions of rotation, and the external thread III (120b-1) (120b-1) is a left-hand thread. The locking nut (400) is internally provided with an internal thread III (431) having the same rotation direction as the extension bolt (120b), and the internal thread III (431) is a left-handed thread. Since the screw portion (110) of the eccentric bolt (100) is opposite to the direction of rotation of the extension bolt (120b), the axial outward force generated by the loosening of the connection pair under the mechanical high-frequency vibration, the outward action is utilized. The interaction of forces can well prevent the loosening of the connection pair.

The side of the backstop nut facing the boss portion II (420) is provided with a protruding portion (310), and a C-shaped bayonet (320) is provided on the protruding portion (310). The boss portion II (420) of the nut (400) abuts against the backstop nut and is snapped into the C-shaped bayonet (320). The side of the boss portion II (420) of the locking nut (400) facing the backstop nut is provided with a tooth-shaped projection II, so as to increase the frictional force between the boss portion and the contact surface of the backstop nut, so that the The connection pair is not easy to loosen under the state of mechanical high frequency vibration.

When the locking nut (400) and the eccentric bolt (100) are screwed together, due to the eccentric design of the extension bolt (120b) and the screw portion (110), the extended convex When the platform portion II (420) abuts against the protruding portion (310) of the retaining nut, a partial overlap occurs, and the C-shaped bayonet (320) is formed by smoothing the overlapped portion.

A method for installing the connection pair of Embodiment 1 (as shown in FIG. 9 ) and Embodiment 3 (as shown in FIG. 10 ) includes the following steps:

(1) A mounting hole A (510) and a mounting hole B (610) are reserved on the component A (500) and the component B (600) where the connection pair needs to be installed on the high-frequency vibration machine, respectively. The mounting hole B (610) ) is provided with an inner thread IV (620) with the same threading direction as the outer wall thread of the screw part (110), and the part B (600) is reserved for use on the side away from the part A (500). a notch for limiting the offset of the backstop washer, and the shape and size of the notch match the backstop washer;

(2) Pass the screw portion (110) of the eccentric bolt (100) along the mounting hole A (510), and then unscrew it along the mounting hole B (610);

(3) Press the backstop washer into the slot, and set the backstop washer on the screw portion (110) of the eccentric bolt (100); One end faces outward, and the protrusion (310) of the backstop washer is annular;

(4) Use the existing leveling tool to cooperate with the eccentric bolt (100), the grinding head of the leveling tool and the outer diameter of the boss portion of the locking bolt (200) or the locking nut (400) Similarly, the overlapping portion of the grinding head of the grinding tool and the convex portion (310) of the backstop washer is ground to form the C-shaped bayonet (320);

(5) Tighten the locking bolt (200) or the locking nut (400) with the eccentric bolt (100), and make the locking bolt (200) or the locking nut (400) ) is snapped into the C-shaped bayonet (320), so that the eccentric bolt (100) is in a locked state with the locking bolt (200) or the locking nut (400).

When the connection pair is in a locked state and the machine is in a high-frequency vibration state, due to the existence of the axial outward force of the connection pair, the high-frequency vibration of the machine causes the screw portion (110) to move toward the locking bolt (200) or the locking nut ( 400), and make the locking bolt (200) or the locking nut (400) move in the direction of the backstop (300), so that the locking bolt (200) or the locking nut (400) and the backstop (300) (or the screw part (110)) is closer to the locking; the tooth-like protrusion at the end of the locking bolt (200) or the locking nut (400) further increases the friction between the contact surface of the locking bolt (200) or the locking nut (400) The C-type bayonet (320) can prevent the locking bolt (200) or the locking nut (400) from rotating and offset, and under multiple actions, the connection pair can be locked more firmly and stably. If it is necessary to disassemble the connecting pair, so that the machine is in a closed and static state, manually turn the locking nut (400) and the backstop (300) to disengage from the C-shaped bayonet (320), and then continue to rotate and disassemble the connecting pair, namely Can.

Although the present invention has been described in detail above with general description and specific embodiments, some modifications or improvements can be made on the basis of the present invention, which will be obvious to those skilled in the art. Therefore, these modifications or improvements made without departing from the spirit of the present invention fall within the scope of the claimed protection of the present invention.

Claims (10)

1. The utility model provides a locking connection is vice which characterized in that: the eccentric bolt comprises a screw rod part and an inner nut, the backstop piece is sleeved on the screw rod part, the inner nut is a groove formed in one end of the screw rod part, and the central axis of the screw rod part and the central axis of the inner nut are not on the same straight line; the locking bolt is coaxially provided with a flange part I, a boss part I and a bolt part which are sequentially connected, and the bolt part is in threaded connection with the inner nut; stopping piece orientation one side of boss portion I is equipped with the bellying, be equipped with C type bayonet socket on the bellying, the boss portion I of locking bolt with stopping piece supports and block in the C type bayonet socket.

2. The anti-loosening joint pair according to claim 1, wherein: an external thread I is arranged on the outer wall of the screw rod part, an internal thread I is arranged on the inner wall of the internal nut, and the screwing directions of the external thread I and the internal thread I are opposite; and the bolt part is provided with an external thread II with the same spiral direction as the internal nut.

3. The anti-loosening joint pair according to claim 2, wherein: the external thread I is a right-handed thread, the internal thread I is a left-handed thread, and the external thread II is a left-handed thread; one side of the boss part I of the locking bolt, which faces the backstop piece, is provided with a dentate bulge.

4. The utility model provides a locking connection is vice which characterized in that: an anti-loosening connecting pair comprises an eccentric bolt, a locking nut and a retaining piece, wherein the eccentric bolt comprises an integrated screw rod part and an extending bolt; the locking nut comprises a flange part II, a boss part II and a nut part which are coaxially arranged, the nut part is arranged at the axle center of the flange part II and the boss part II in a penetrating way, and the nut part is in threaded connection with the extension bolt; stopping piece orientation one side of boss portion II is equipped with the bellying, be equipped with C type bayonet socket on the bellying, locking nut's boss portion II with stopping piece supports and blocks into in the C type bayonet socket.

5. The anti-loosening joint pair according to claim 4, wherein: an external thread I is arranged on the outer wall of the screw rod part, an external thread III is arranged on the outer wall of the extension bolt, and the rotating directions of the external thread I and the external thread III are opposite; and an internal thread III which is the same as the screwing direction of the extension bolt is arranged in the locking nut.

6. The anti-loosening joint pair according to claim 5, wherein: the external thread I is a right-handed thread, the external thread III is a left-handed thread, and the internal thread III is a left-handed thread; one side of the boss part II of the locking bolt, which faces the backstop piece, is provided with a dentate bulge.

7. The anti-loosening connection pair according to claim 2 or 5, wherein: the stopping piece is a stopping nut, and an internal thread II which has the same rotating direction with the screw rod part is arranged on the stopping nut.

8. The anti-loosening connection pair according to claim 2 or 5, wherein: the check piece is a check gasket which is sleeved on the screw part of the eccentric bolt through interference fit.

9. The anti-loosening joint pair according to any one of claims 1 to 6, wherein: the eccentric bolt further comprises a nut located at an end remote from the inner nut or the extension bolt.

10. A method of installing a connection pair, comprising the steps of:

(1) respectively reserving a mounting hole A and a mounting hole B on a component A and a component B which need to be provided with a connecting pair on a high-frequency vibration machine, wherein the inner wall of the mounting hole B is provided with an internal thread IV with the same thread turning direction as the outer wall of the screw rod part, a notch for limiting the deviation of the retaining gasket is reserved on one side of the component B far away from the component A, and the shape and the size of the notch are matched with the retaining gasket;

(2) the screw rod part of the eccentric bolt penetrates through the mounting hole A and then is screwed out along the mounting hole B;

(3) pressing the retaining gasket into the notch, and sleeving the retaining gasket on the screw part of the eccentric bolt; one end of the protruding part of the retaining gasket faces outwards, and the protruding part of the retaining gasket is annular;

(4) the existing grinding tool is matched with the eccentric bolt, the outer diameter of a grinding head of the grinding tool is the same as that of a boss part of the locking bolt or the locking nut, and the part of the grinding head of the grinding tool, which is overlapped with the boss part of the retaining gasket, is ground to form the C-shaped bayonet;

(5) and screwing the locking bolt or the locking nut and the eccentric bolt, and clamping the locking bolt or the locking nut into the C-shaped bayonet, so that the eccentric bolt and the locking bolt or the locking nut are in a locking state.

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