Tail accessory and connector capable of quickly fixing cables

Abstract

The present invention relates to a tail accessory and connector for quickly fixing cables. The tail accessory includes a shell, a sealing rubber ring and a tail nut. The tail nut is assembled at the tail of the shell and enables the sealing rubber ring to hold the tail cable tightly. The tail nut has a primary locking position for primary locking with the shell and a secondary locking position for secondary locking with the shell within its rotational stroke. When it is in the primary locking position, the tail nut begins to squeeze the sealing rubber ring, and the tail cable in the sealing rubber ring can move freely; when it is in the secondary locking position, the sealing rubber ring holds the tail cable tightly under the squeezing of the tail nut, making it unable to move. The tail accessory of the present invention is provided with two locking and fixing positions. One locking and fixing position can realize the free sliding of the cable, which is convenient for on-site operation of the cable, and the nut will not loosen at the same time. The other position realizes cable clamping and sealing. At this time, the cable is reliably clamped and no additional tools are required.

Description

Technical Field

[0001] The present invention belongs to the technical field of connectors, and in particular relates to a tail accessory and a connector capable of quickly fixing a cable. Background Art

[0002] When devices and cables are used together, a cable gland is often required to securely seal the cable. This is most commonly a cable gland. The gland is displaced by the threads of a nut, which compresses the clamping jaws. The jaws then retract and tighten the waterproof ring, securing the internal cable. This technology is particularly advantageous when adapting to a wide range of cable diameters; different cable specifications can be accommodated with different torques. However, this structure has the following disadvantages in certain scenarios:

[0003] 1. The nut operation is cumbersome. In some scenarios, the cable needs to be loosened. At this time, the worker is not sure when the cable is released. Usually the nut is separated from the main body to operate the internal cable, resulting in repeated long-distance screwing operations.

[0004] 2. When there is no wrench on site, that is, in a tool-free scenario, it is impossible to tell when the cable is tightened properly. In this case, the cable may not be clamped effectively, and the sealing function may fail. Or it may be over-tightened. If the cable is fragile, it may easily cause the cable sheath to rupture or damage the internal structure of the cable. Summary of the Invention

[0005] In order to solve the above problems, the present invention provides a tail accessory and connector that can quickly fix the cable, so that the cable can be quickly fixed and loosened by setting a first fixed position that can loosen the cable and a second fixed position that can hold the cable tightly between the shell and the nut, thereby meeting different usage requirements.

[0006] The purpose of the present invention and the solution to its technical problems are achieved by adopting the following technical solutions. According to the present invention, a tail accessory for quickly fixing a cable is proposed, which includes a shell, a sealing rubber ring and a tail nut. The tail nut is assembled at the tail of the shell and enables the sealing rubber ring to hold the tail cable tightly. The tail nut has a first-level locking position for first-level locking with the shell and a second-level locking position for second-level locking with the shell within its rotation stroke. When the first level is locked, the tail nut begins to squeeze the sealing rubber ring, and the tail cable in the sealing rubber ring can move freely. When in the second-level locking position, the sealing rubber ring holds the tail cable tightly under the squeezing of the tail nut, making it unable to move.

[0007] The purpose of the present invention and the solution to its technical problems can be further achieved by adopting the following technical measures.

[0008] The aforementioned tail accessory for quickly fixing a cable, wherein the shell and the tail nut respectively realize primary locking and secondary locking through the cooperation of the curved groove structure and the boss structure, and when the two are locked at the primary level, the curved groove structure realizes rotation blocking of the tail nut in the unlocking direction through the cooperation of the primary limiting part and the boss structure; when the two are locked at the secondary level, the curved groove structure realizes rotation blocking of the tail nut through the cooperation of the secondary limiting part and the boss structure, and the conversion between the above-mentioned primary locking position and the secondary locking position is fast and convenient, without the aid of tools.

[0009] The aforementioned tail accessory for quickly fixing a cable, wherein the boss structure is at least one boss distributed on the outer periphery of the shell, and the curved groove structure is a curved groove 21 on the tail nut adapted to the boss; the first-level limiting portion is a groove formed by the curved groove being concave toward the shell side by the side wall of the shell close to the side wall of the shell; the second-level limiting portion is a groove formed at the end of the curved groove.

[0010] In the aforementioned tail accessory for quickly fixing a cable, the curved groove is adapted to guide the boss through a guide notch on the inner side of the front end of the tail nut.

[0011] In the aforementioned tail accessory for quickly fixing a cable, the first-level limiting portion is a guide protrusion extending from the bottom of the curved groove, and the guide protrusion cooperates with the boss to achieve first-level locking between the shell and the tail nut.

[0012] In the aforementioned tail accessory for quickly fixing a cable, the surface of the guide protrusion that guides the boss to the primary locking position is an inclined surface, and the surface that keeps the boss in the primary locking position is a stop surface.

[0013] In the aforementioned tail attachment for quickly securing a cable, the primary retaining portion is a retaining groove connected to the curved groove and extending circumferentially along the tail nut. This retaining groove is not located in the rotational locking path between the curved groove and the boss. When the curved groove and the retaining groove are connected, the boss can rotate in the unlocking direction into the retaining groove. While a certain locking force must be overcome when the tail nut rotates forward in the locking direction, no locking force is required when the boss enters the retaining groove in the unlocking direction. This allows for a labor-saving and rapid connection between the tail nut and the housing, ensuring that the tail nut does not become loose from the housing.

[0014] In the aforementioned tail attachment for quickly fixing a cable, the first-level limiting portion is a convex bump raised on at least one side wall of the curved groove and used to prevent the tail nut from rotating in the unlocking direction.

[0015] In the aforementioned tail accessory for quickly fixing a cable, the guiding notch portion of the curved groove is a blind groove, and the other portion is a through groove, so as to facilitate processing and use.

[0016] The aforementioned tail accessory for quickly fixing a cable, wherein a compression ring is further provided between the tail nut and the sealing rubber ring, and the compression ring is used to assist in compressing the sealing rubber ring and prevent the sealing rubber ring from rotating with the tail nut.

[0017] In the aforementioned tail accessory for quickly fixing a cable, the sealing rubber ring and the compression ring are both provided with a side slit for allowing the tail cable to enter from one side.

[0018] The purpose of the present invention and the solution to its technical problems are achieved by adopting the following technical solutions. According to the connector with the above-mentioned tail attachment proposed by the present invention; it includes a locking mechanism, and when it is in the secondary locking position, the tail nut blocks the unlocking path of the locking mechanism to prevent it from unlocking; when it is in the primary locking position, the tail nut makes way for the unlocking path so that the unlocking mechanism can be unlocked. The unlocking of the unlocking mechanism in the connector of the present invention is limited by the position of the tail nut. When the tail nut is in the primary locking position, the unlocking mechanism can be unlocked normally. When the tail nut is in the secondary locking position, the connector cannot be unlocked normally, so as to prevent the connector from being unlocked and removed before the cable is loosened, thereby preventing the cable from being damaged.

[0019] Compared with the prior art, the present invention has obvious advantages and beneficial effects. By means of the above technical solution, the present invention can achieve considerable technological advancement and practicality, and has wide industrial application value. It has at least the following advantages:

[0020] The tail accessory of the present invention includes a shell, a sealing rubber ring and a nut. The shell and the nut can achieve two fixed positions by changing the locking position. The two fixed positions correspond to the release state and the clamping state of the cable inside the tail accessory, respectively. The first-level locking position: After rotating the tail nut and initially matching with the shell, the three bosses fall into the first-level limiting portion of the curved groove. At this time, the sealing rubber ring is slightly compressed, but the cable can still move freely. At this time, the sealing rubber ring will provide a certain rebound force to the nut to prevent the tail nut from falling when operating the cable. The second-level locking position: Continue to rotate the tail nut, and the three bosses fall into the second-level groove. At this time, the sealing rubber ring is compressed normally, and the cable is clamped and sealed by the clamping force of the rubber ring. At this time, the sealing rubber ring will still provide continuous rebound force to the nut, which has an anti-loosening effect.

[0021] The tail attachment of the present invention features two fixed positions. The first position allows the cable to slide freely, facilitating on-site cable manipulation without loosening the nut. The other position provides a secure cable clamping seal, ensuring a secure grip without the need for additional tools. Furthermore, the present invention allows the cable to be identified as either operable or sealed by observing the two fixed positions of the tail attachment, facilitating cable status identification.

[0022] The present invention also assists in compressing the sealing rubber ring through the clamping ring, while ensuring that the rubber ring will not rotate when the tail nut is tightened, thereby preventing the sealing rubber ring from rotating and driving the cable to rotate, causing the position relationship of the cable connector to change and making it impossible to plug in normally. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of Example 1 when the tail nut is in the first-level locking state;

[0024] Figure 2 This is a schematic diagram of the tail nut of Example 1 in the secondary locking state;

[0025] Figure 3 This is an exploded view of the tail attachment of Example 1;

[0026] Figure 4 This is a schematic diagram of the housing structure of Example 1;

[0027] Figure 5 This is a schematic diagram of the tail nut structure of Example 1;

[0028] Figure 6 This is a cross-sectional view of the tail nut of Example 1 when it is in the first-level locking state;

[0029] Figure 7 This is a cross-sectional view of the tail nut of Example 1 when it is in the secondary locking state;

[0030] Figure 8 This is a schematic diagram of the tail nut of Example 2;

[0031] Figure 9 This is a schematic diagram of the first-level locking of the tail nut in Example 2;

[0032] Figure 10 for Figure 9 A partial enlarged view of

[0033] Figure 11 This is a schematic diagram of the tail nut of Example 3;

[0034] Figure 12 This is a schematic diagram of the first-level locking of the tail nut in Example 3;

[0035] Figure 13 This is a schematic diagram of the tail nut of Example 4;

[0036] Figure 14 This is a schematic diagram of the first-level locking of the tail nut in Example 4;

[0037] Figure 15 A schematic diagram of a connector with a tail attachment of the present invention being locked at the tail nut level;

[0038] Figure 16It is a schematic diagram of a connector with a tail attachment of the present invention being locked with a secondary lock of a tail nut.

[0039]

Main component symbol description

[0040] 1: Shell

[0041] 2: Tail nut

[0042] 21: Qu Groove

[0043] 221: Guide protrusion

[0044] 2211: Chamfer

[0045] 222: Limit slot

[0046] 223: Convex Hull

[0047] 24: Guiding the Gap

[0048] 3: Sealing rubber ring

[0049] 31: Rubber ring side seam

[0050] 32: Convex ribs

[0051] 4: Tail cable

[0052] 5: Clamping ring

[0053] 51: Side seam of the compression ring

[0054] 6: Boss

[0055] 7: Locking mechanism DETAILED DESCRIPTION

[0056] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the specific implementation method, structure, characteristics and effects of the tail accessory for quickly fixing the cable proposed by the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0057] See also Figure 1-7 , which is a schematic structural diagram of the various parts of the tail accessory for quickly fixing cables according to embodiment 1 of the present invention. The tail accessory includes a shell 1 and a sealing rubber ring 3 assembled at the rear of the shell 1 for sealing the tail cable 4. The direction from front to back in the tail accessory is defined as the direction from the shell 1 to the tail cable 4; the front end outer peripheral surface of the sealing rubber ring 3 contacts and seals with the inner wall of the shell 1; the tail nut 2 assembled at the rear of the shell 1 is rotated to press the part of the sealing rubber ring 3 extending out of the shell 1, so that it is tightly hugged on the tail cable, thereby achieving reliable sealing and tensile resistance of the tail cable.

[0058] The portion of the sealing rubber ring 3 extending out of the housing 1 is tapered, with a larger front portion and a smaller rear portion, so that it can grip the tail cable 4 when the tail nut 2 is tightened. The inside of the tail nut 2 has a gradually tapering slope from front to back, so that it can cooperate with the tapered surface at the rear end of the sealing rubber ring 3, allowing the sealing rubber ring 3 to grip the tail cable.

[0059] The tail nut 2 has a primary locking position for primary locking with the shell 1 and a secondary locking position for secondary locking with the shell 1 within its rotation stroke (including the rotation locking stroke and the rotation unlocking stroke), and when it is in the primary locking position, the tail nut 2 begins to squeeze the sealing rubber ring 3, but the sealing rubber ring 3 does not hold the tail cable 4 tightly, and the tail cable 4 can move freely at this time, that is, the tail cable 4 is in a released state at this time; when it is in the secondary locking position, the sealing rubber ring 3 holds the tail cable 4 under the pressure of the tail nut 2, and the tail cable 4 is in a state of being clamped and fixed. When it is in the primary locking position, there is a matching limit between the tail nut 2 and the shell 1 to prevent the tail nut 2 from detaching from the shell 1, and when it reaches the secondary locking position, the rotation of the tail nut 2 in the unlocking direction and the locking direction is restricted.

[0060] The shell 1 and the tail nut 2 respectively achieve primary locking and secondary locking through the cooperation of the curved groove structure and the protruding structure. The protruding structure is inserted into the curved groove structure and slides in contact with the side wall of the curved groove structure. When the two are locked at the primary level, one end with the curved groove structure is also provided with a primary limiting portion that cooperates with the protruding structure at the other end to prevent the tail nut from rotating in the unlocking direction; when the two are locked at the secondary level, one end with the curved groove structure is provided with a secondary limiting portion that cooperates with the protruding structure at the other end to prevent the tail nut from rotating in either direction.

[0061] In this embodiment, at least one boss 6 is provided on the outer periphery of the housing 1, and a corresponding curved groove 21 is provided on the tail nut 2 for avoiding the boss. When the tail nut 2 rotates, each boss 6 is located within the corresponding curved groove 21. The curved groove 21 also has a primary limiting portion that cooperates with the boss 6 to achieve primary locking of the tail nut 2 and the housing 1, and a secondary limiting portion that cooperates with the boss 6 to achieve secondary locking of the tail nut and the housing 1. The curved groove 21 is defined as the first side wall 211, and the wall away from the housing 1 is defined as the second side wall 212. The end of the curved groove 21 for the boss 6 to enter is the curved groove front end 201, and the other end is the curved groove end 202. In this embodiment, the primary limiting portion is a recessed portion 220 formed by the first sidewall 211 of the curved groove 21 being recessed toward the housing. When the boss 6 enters the recessed portion 220, it is restrained by the sidewall of the recessed portion 220, preventing the tail nut 2 from further rotation. Both sides of the recessed portion can cooperate with the boss 6 to provide a limiting force, and the stopping force preventing the tail nut from rotating in the unlocking direction is greater than the stopping force preventing the tail nut from rotating in the locking direction. The secondary limiting portion is a groove 23 located at the end of the curved groove 21. The groove 23 cooperates with the boss 6 to prevent the tail nut 2 from rotating.

[0062] The curved groove 21 is adapted to guide the boss 6 through a guide notch 24 located at the inner side of the front end of the tail nut 2. In this embodiment, the guide notch 24 has a depth not less than the height of the boss 6 to facilitate unobstructed passage of the boss 6.

[0063] In this embodiment, three bosses 6 are evenly distributed along the circumferential direction on the outer periphery of the housing 1 , and three curved grooves 21 are correspondingly provided on the tail nut 2 .

[0064] In this embodiment, the curved groove 21 is a through groove except for the guide notch 24 at the front end. However, in other embodiments, the curved groove 21 can be a through groove or a blind groove.

[0065] In this embodiment, a compression ring 5 is provided between the sealing rubber ring 3 and the tail nut 2. This compression ring 5 assists the tail nut 2 in compressing the sealing rubber ring 3. The provision of this compression ring 5 prevents the tail nut 2 from rotating with the sealing rubber ring 3, which could cause the cable connector to shift position and affect proper insertion. The front inner circumference of the compression ring 5 is a conical surface that mates with the outer conical surface of the sealing rubber ring 3. The rear end of the front outer circumference also has an inclined surface that mates with the inner inclined surface of the tail nut to squeeze the sealing rubber ring when the tail nut is tightened. The rear end of the compression ring 5 is a straight section that mates with the inner circumference of the tail nut.

[0066] In this embodiment, the sealing rubber ring 3 has a side slit 31 for the tail cable 4 to pass through, enabling side-mounting. The clamping ring 5 also has a side slit 51 for the tail cable 4 to pass through. The provision of the rubber ring side slit 31 and the clamping ring side slit 51 facilitates assembly of the connector using this tail accessory by first attaching the cable connector and then attaching the sealing rubber ring 3 and the clamping ring 5.

[0067] In this embodiment, the sealing rubber ring 3 achieves an interference seal with the housing 1 through ribs on its front outer circumference, and its inner circumference is also provided with ribs 32 to enhance the seal with the rear cable 4. The sealing rubber ring 3 also has a stepped surface 33 that cooperates with the rear end surface of the housing 1 to achieve axial positioning.

[0068] See also Figures 8-10 , which is a cross-sectional view of the tail nut of Example 2 of the present invention and the tail nut in the primary locking position. The difference between this embodiment and Example 1 is that the primary limiting portion is a guide protrusion 221 located at the guide notch 24. This guide protrusion 221 blocks the path of the boss 6 entering the curved groove 21 and can enable the boss 6 to pass over it and enter the curved groove 21 when the set force is reached. The front end of the guide protrusion 221 has a chamfer 2211 that cooperates with the boss 6 for guidance, and the rear end has a stop surface 2212 that stops and limits the boss 6, so that the tail nut 2 can be maintained in the primary locking position.

[0069] In other embodiments of the present invention, the guide protrusion 221 is formed at the bottom of the curved groove 21 except the guide notch 21. When the tail nut 2 rotates in the locking direction, the force of the boss 6 passing over the guide protrusion 221 to achieve primary locking with the tail nut is less than the force of the boss 6 passing over the guide protrusion 221 to achieve primary locking and unlocking.

[0070] In an embodiment of the present invention, the secondary limiting portion may have the same composition as the primary limiting portion, and is also a guide protrusion. In this case, the position where the secondary limiting portion is set in the curved groove is a blind groove, and the guide protrusion is located at the bottom of the blind groove.

[0071] See also Figure 11 and Figure 12, which is a cross-sectional view of the tail nut of Example 2 of the present invention and the tail nut when it is in the first-level locking position. The difference between this embodiment and Example 1 is that the first-level limiting portion is a limiting groove 222 connected to the curved groove 21. The limiting groove extends circumferentially along the tail nut 2 and is not on the path of the tail nut 2 and the boss 6 for locking. It extends from the position between the front end 201 of the curved groove and the end 202 of the curved groove in the direction opposite to the locking direction. Preferably, the limiting groove is a through groove. When the boss 6 reaches the position where the curved groove 21 is connected to the limiting groove 222, the tail nut 2 is rotated in the reverse direction so that the boss 6 enters the limiting groove 222, achieving the first-level locking limit and preventing the tail nut 2 from falling off the shell. Preferably, the limiting groove 222 is a through groove formed by the reverse extension of the portion of the curved groove 21 near the guide notch 24.

[0072] In an embodiment of the present invention, the secondary limiting portion may have the same composition as the primary limiting portion, and is also a limiting groove extending along the circumference of the tail nut.

[0073] See also Figure 12 and Figure 13 , which shows a cross-sectional view of the tail nut of Example 3 of the present invention and the tail nut in the primary locking position. This embodiment differs from Example 1 in that the primary limiting portion is a bump 223 that prevents the tail nut 2 from rotating in the unlocking direction. This bump 223 is formed by the inward protrusion of the sidewalls of the curved groove 21. A certain force is applied to cause the boss 6 to pass over the bump 223 to reach the primary locking position. At this point, the boss 6 is retained in this primary locking position by the bump 223, preventing the tail nut from unlocking and falling off. In this embodiment, the two side walls of the curved groove 21 protrude relative to each other to form two bumps 223.

[0074] Preferably, the convex bump 223 has a guide surface 2231 that guides the boss 6 in the locking direction and a stop surface 2232 that prevents the boss 6 from rotating in the unlocking direction. The inclination angle of the guide surface 2231 is smaller than the inclination angle of the stop surface 2232, so that the locking force when the boss 6 passes over the guide surface 2231 for locking is smaller than the unlocking force when it passes over the stop surface 2232 for unlocking.

[0075] In the embodiment of the present invention, the secondary limiting portion can be composed of the same as the primary limiting portion, and is also formed by the convex bulge formed by the side wall of the curved groove 21 protruding inward. Figure 14 and Figure 15 The tail nut of the present invention is used in conjunction with the connector. When the connector is locked with the receptacle and the tail nut is clamped to the cable, it is usually necessary to loosen the tail nut first to release the cable before operating the connector to prevent the cable from being damaged. The two locking positions of the tail nut correspond to the connector's two positions of insertion and locking and unlocking and removal, making the connector foolproof.

[0076] That is, the unlocking and locking of the locking mechanism 7 of the connector using the tail accessory of the present invention is affected by the position of the tail nut 2. When the tail nut 2 is in the first-level locking position, that is, when the tail nut 2 is rotated to initially match with the shell 1 and the boss on the shell 1 falls into the first-level limit portion in the curved groove, the tail nut 2 makes way for the action path of the locking mechanism 7, so that the locking mechanism 7 can be locked and unlocked normally. At this time, since the tail cable 4 is not clamped and can move freely, the connector removal process will not pull the tail cable 4 and cause the cable 4 to be damaged.

[0077] When the tail nut 2 is in the secondary locking position, it moves into the unlocking path of the locking mechanism 7, preventing the unlocking mechanism 7 from unlocking, making the connector impossible to unlock and remove. Only when the tail nut 2 is rotated to the primary locking position can the unlocking path be cleared and the connector unlocked. This effectively prevents damage to the tail cable 4 caused by removing the connector while the tail cable is fixed, and effectively prevents workers from operating it incorrectly.

[0078] In this embodiment of the present invention, the unlocking mechanism 7 is unlocked via a locking button at its rear end. When the rear nut is in the secondary locking position, it rests against the locking button, preventing it from being pressed to unlock the connector. When the rear nut 2 is rotated to the primary locking position, it moves away from the locking button, allowing it to be freely pressed to unlock the connector.

[0079] In other embodiments of the present invention, the unlocking structure and unlocking form of the unlocking mechanism 7 can be changed, but the unlocking of the unlocking mechanism is limited by the position of the tail nut. When the tail nut is in the first-level locking position, the unlocking mechanism can be unlocked normally. When the tail nut is in the second-level locking position, the connector cannot be unlocked normally to prevent the connector from being unlocked and removed before the cable is loosened, thereby damaging the cable.

[0080] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with the present profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A tail attachment for quickly fixing cables, comprising a housing, a sealing rubber ring, and a tail nut. The tail nut is rotatably assembled on the rear of the housing, allowing the sealing rubber ring to tightly grip the tail cable. The mating portion of the sealing rubber ring and the tail nut is tapered, with the front portion being larger and the rear portion being smaller. The following features are present: The tail nut has a first-level locking position for first-level locking with the shell and a second-level locking position for second-level locking with the shell within its rotation stroke, and when the first level is locked, the tail nut squeezes the sealing rubber ring, and the tail cable in the sealing rubber ring can move freely; when the second level is locked, the sealing rubber ring holds the tail cable tightly under the squeezing of the tail nut so that it cannot move; wherein the shell and the tail nut respectively realize the first-level locking and the second-level locking through the cooperation of the curved groove structure and the boss structure, and when the two are locked at the first level, the curved groove structure realizes the rotation blocking of the tail nut in the unlocking direction through the cooperation of the first limit part and the boss structure; when the two are locked at the second level, the curved groove structure realizes the rotation blocking of the tail nut through the cooperation of the second limit part and the boss structure.

2. The tail accessory for quickly fixing a cable according to claim 1, characterized in that: The boss structure is at least one boss distributed on the outer periphery of the shell, and the curved groove structure is a curved groove on the tail nut that is adapted to the boss, the boss is stuck in the curved groove and slides with the side wall of the curved groove; the curved groove is provided with a guide notch, and the guide notch is used for the boss to enter the curved groove.

3. The tail accessory for quickly fixing a cable according to claim 2, characterized in that: The first-level limiting portion is a recessed portion of the curved groove wall, and the recessed portion is formed by the side wall of the curved groove being recessed in the displacement direction when the nut is locked.

4. The tail attachment for quickly fixing a cable according to claim 2, characterized in that: The first-level limiting portion is a guide protrusion extending from the bottom of the curved groove, and the guide protrusion cooperates with the boss to achieve first-level locking between the shell and the tail nut.

5. The tail attachment for quickly fixing a cable according to claim 4, characterized in that: The guide protrusion includes a chamfer and a stop surface. The chamfer is used to guide the boss into the first-level locking position, and the stop surface is used to cooperate with the boss stop to keep the boss in the first-level locking position.

6. The tail attachment for quickly fixing a cable according to claim 2, characterized in that: The first-level limiting portion is a limiting groove on the curved groove. After the boss enters the curved groove, the tail nut rotates in the unlocking direction to allow the boss to enter the limiting groove.

7. The tail attachment for quickly fixing a cable according to claim 2, characterized in that: The first-level limiting portion is a convex bump raised on at least one side wall of the curved groove, and the convex bump is used to prevent the tail nut from rotating in the unlocking direction.

8. The tail accessory for quickly fixing a cable according to any one of claims 3 to 7, characterized in that: The secondary limiting portion is a groove or a guide protrusion or a convex bump or a limiting groove at the end of the curved groove.

9. The tail accessory for quickly fixing a cable according to any one of claims 2 to 7, characterized in that: The guiding notch portion of the curved groove is a blind groove, and the other portions of the curved groove are through grooves.

10. The tail accessory for quickly fixing a cable according to any one of claims 1 to 7, characterized in that: A compression ring is provided between the tail nut and the sealing rubber ring, and the compression ring is used to assist in compressing the sealing rubber ring and prevent the sealing rubber ring from rotating with the tail nut.

11. The tail accessory for quickly fixing a cable according to claim 10, characterized in that: The sealing rubber ring and the compression ring are both provided with a side seam for the tail cable to enter from one side.

12. A connector, characterized in that: It includes the tail accessory described in any one of claims 1 to 11, and also includes an unlocking mechanism, and when the tail nut is in the secondary locking position, the tail nut blocks the unlocking path of the unlocking mechanism to prevent it from being unlocked; when the tail nut is in the primary locking position, the tail nut makes way for the unlocking path to enable the unlocking mechanism to be unlocked.

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