A rotary steel ball locking device and connector

Abstract

The present invention relates to a rotary steel ball locking device and a connector, including a plug end and a socket end, wherein the plug end is provided with a steel ball groove in the circumferential direction; the socket end includes an outer shell, an inner sleeve, an inner shaft, a large steel ball and a spring, and a first groove is provided on the inner side of the outer shell, corresponding to the large steel ball; a long waist hole is provided axially on the inner shaft, and the large steel ball is arranged in the long waist hole in an active state, and the diameter of the large steel ball is greater than the wall thickness of the inner shaft at this point, and a third boss is also provided on the inner shaft; a second boss is provided on the inner sleeve, and the two ends of the spring are respectively connected to the second boss and the third boss, and the three are on the same arc line along the inner shaft; the inner sleeve is also provided with a bevel groove, and the bevel groove is correspondingly fitted with the large steel ball, and the large steel ball can reciprocate back and forth along the long waist hole; the outer shell drives the inner sleeve to rotate along the inner shaft. A connector contains the rotary steel ball locking device. The present invention has a novel structure, can be quickly plugged and unplugged, and can avoid misplugging and unplugging through the product appearance, improves safety performance, and is easy to use.

Description

Technical Field

[0001] The present invention belongs to the field of mechanical parts and components, and in particular relates to a rotary steel ball locking device, and further relates to a connector comprising the aforementioned locking device. Background Art

[0002] Traditional locking devices are usually implemented by push-pull steel ball locking or thread rotation locking.

[0003] The Chinese patent with the announcement number CN 209444953U discloses a quick-insert rotary locking plug, which is locked by matching the internal and external threads and the slot 31 located just above the external threads with the steel ball 14. The locking device disclosed in the patent is not suitable for occasions requiring frequent plugging and unplugging and quick connection because it takes a long time to match the internal and external threads.

[0004] In addition, the traditional locking device cannot identify the locking of the plug end and the socket end from the overall appearance, that is, it is impossible to identify the wrong insertion and removal from the appearance of the locking device or the connector, so there will be safety hazards, and in serious cases, accidents will occur. At the same time, the traditional locking device must be strictly aligned with the card slot when plugging in, and blind insertion cannot be achieved, which is inconvenient to use in some limited spaces. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a rotary steel ball locking device and a connector, which are used to overcome product defects such as low plugging and unplugging efficiency and potential safety hazards caused by mis-plugging that is difficult to identify from the appearance.

[0006] To achieve the above purpose, the technical solution provided by the present invention is:

[0007] A rotary steel ball locking device comprises a plug end and a socket end, wherein the plug end is provided with a steel ball groove in a circumferential direction; the socket end comprises an inner sleeve, an inner shaft, an outer shell, a large steel ball and a spring, the inner shaft is axially provided with a long waist hole, the large steel ball is arranged in the long waist hole in an active state, the position of the large steel ball is limited in the long waist hole, the diameter of the large steel ball is larger than the wall thickness of the inner shaft at this point, and a third boss is also provided on the inner shaft; a second boss is provided on the inner sleeve, one end of the spring is mounted on the second boss, and the other end is mounted on the third boss, the spring, the second boss and the third boss are on the same arc line along the inner shaft, the inner sleeve is also provided with a bevel groove, the bevel of the bevel groove corresponds to the large steel ball, and the large steel ball can reciprocate back and forth along the long waist hole; a first groove is provided on the inner side of the outer shell, and the outer shell drives the inner sleeve to perform rotational motion along the inner shaft, and the first groove corresponds to the large steel ball when the sleeve rotates to be held immobile by the large steel ball.

[0008] Exemplarily, the number of the springs is 2, and the springs are distributed on the inner shaft in a centrally symmetrical manner.

[0009] Exemplarily, the inner shaft is also provided with a first small steel ball through hole, and the socket end also includes a small steel ball. The small steel ball is arranged in the first small steel ball through hole in an active state, and the position of the small steel ball is limited in the first small steel ball through hole. The diameter of the small steel ball is larger than the wall thickness of the inner shaft at this point; the inner sleeve is also provided with a second small steel ball through hole, and the second small steel ball through hole and the first small steel ball through hole can overlap correspondingly when the inner sleeve rotates until it is held immobile by the large steel ball.

[0010] Exemplarily, the outer shell is further provided with a first boss, and the inner sleeve is further provided with a second groove, and the first boss corresponds to and cooperates with the second groove so that the outer shell drives the inner sleeve to perform rotational motion along the inner shaft.

[0011] Exemplarily, the outer shell is further provided with a groove, and the inner sleeve is further provided with a boss, and the boss cooperates with the groove so that the outer shell drives the inner sleeve to rotate along the inner shaft.

[0012] Exemplarily, the socket end further includes a limiting member for limiting the position of the housing.

[0013] Exemplarily, the limiting member is a retaining spring, the inner shaft is further provided with a circle of retaining spring grooves for installing the retaining spring, and the outer shell further includes a step, which is arranged corresponding to the retaining spring.

[0014] Exemplarily, the limiting member is a limiting bolt or a limiting nut or a limiting protrusion or a limiting ring, or a combination of the above.

[0015] Exemplarily, the socket end also includes a detachable pressure ring for limiting the position of the small steel ball, so that the small steel ball can remain active in the first small steel ball through hole.

[0016] Exemplarily, the socket end also includes a pressure ring integrally formed with the inner shaft for limiting the position of the small steel ball, so that the small steel ball can remain active in the first small steel ball through hole.

[0017] Exemplarily, the spring is a tension spring and / or a compression spring.

[0018] Exemplarily, the long waist hole is in an open state of being larger at the top and smaller at the bottom, and the cross-sectional shape of the long waist hole is a trapezoid.

[0019] Exemplarily, the bottom of the opening corresponding to the inclined groove is arc-shaped.

[0020] Exemplarily, the outer surface of the shell is provided with an anti-slip structure.

[0021] Exemplarily, the anti-slip structure is a spiral groove or a spiral pattern or a convex point or a concave point, or a combination of these.

[0022] Exemplarily, the plug end further includes a flange, and the flange is square or circular.

[0023] As another invention of the present application, a connector includes any one of the above-mentioned rotary steel ball locking devices.

[0024] Exemplarily, a connector includes a pin and a socket, wherein the pin is disposed in the plug end, and the socket is disposed in the socket end, and the pin and the socket are matched with each other.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] (1) The rotary locking device and connector provided by the present invention are not only novel in structure but also can realize quick plugging and unplugging;

[0027] (2) In addition, when locking or unlocking, the housing of the present invention rotates, so the plugging and unplugging status can be judged by appearance, thereby avoiding wrong plugging and unplugging, thereby improving the safety of the locking device and the connector containing the locking device; and the present invention can realize blind plugging, which is suitable for occasions with limited space, providing great convenience for users. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic diagram of a half-section structure of a steel ball locking device according to an embodiment of the present invention;

[0029] Figure 2 for Figure 1 Plug end structure diagram;

[0030] Figure 3 for Figure 1 Internal axis structure diagram;

[0031] Figure 4 for Figure 1 Inner sleeve structure diagram;

[0032] Figure 5 for Figure 1 Shell structure diagram;

[0033] Figure 6 It is a schematic diagram of the connector plug-in structure including the rotary steel ball locking device of the present invention;

[0034] Figure 7 for Figure 6 Plug end with pins shown;

[0035] Figure 8 for Figure 6 The socket end with the jack shown;

[0036] Fig. 9This is a structural diagram of the inner shaft of a steel ball locking device according to another embodiment of the present invention.

[0037] in:

[0038] 1 is the plug end;

[0039] 2 is the outer shell;

[0040] 3 is the circlip;

[0041] 4 is a large steel ball;

[0042] 5 is an inner sleeve;

[0043] 6 is a spring;

[0044] 7 is the inner axis;

[0045] 8 is a small steel ball;

[0046] 9 is a pressure ring;

[0047] 101 is a steel ball groove;

[0048] 102 is a flange;

[0049] 103 is a pin;

[0050] 104 is a socket;

[0051] 201 is a first groove;

[0052] 202 is a first boss;

[0053] 203 for steps;

[0054] 501 is a bevel groove;

[0055] 502 is a second groove;

[0056] 503 is a second boss;

[0057] 504 is a second small steel ball through hole;

[0058] 701 is a retaining ring groove;

[0059] 702 is a long waist hole;

[0060] 703 is a first small steel ball through hole;

[0061] 704 is the third boss. DETAILED DESCRIPTION

[0062] In order to make the technical problems solved by the invention, the technical solutions adopted and the technical effects achieved clearer, the invention is further described in detail below in conjunction with the drawings of the specification. Obviously, the specific embodiments described are only for the convenience of understanding of those skilled in the art and are not all embodiments of the invention. Based on the embodiments of the invention, all other embodiments obtained by those skilled in the art without making creative work belong to the protection scope of the invention.

[0063] A rotary steel ball locking device comprises a plug end 1 and a socket end, wherein the plug end 1 is provided with a steel ball groove 101 in the circumferential direction. Figure 2 The socket end includes a housing 2, an inner sleeve 5, an inner shaft 7, a large steel ball 4, a spring 6 and a small steel ball 8, as shown in detail Figure 1 The housing 2 includes a first groove 201 and a step 203. The first groove 201 is arranged on the inner side of the housing 2. When the housing 2 is rotated to be held by the large steel ball 4 and does not move, the first groove 201 corresponds to the large steel ball 4. Figure 5 The inner shaft 7 comprises a spring groove 701, a long waist hole 702, a first small steel ball through hole 703 and a third boss 704. The spring groove 701 is provided at the left end of the inner shaft 7. Figure 3 As shown, the retaining ring groove 701 can be provided with one or more circles for installing the retaining ring 3. The retaining ring 3 is provided corresponding to the step 203 and is located on the outside of the step 203, so as to limit the position of the outer shell 2. The long waist hole 702 is axially provided on the inner shaft 7. The large steel ball 4 can be arranged in the long waist hole 702 in an upward and downward movable state along a direction perpendicular to the surface of the inner shaft 7. The position of the large steel ball 4 is limited in the long waist hole 702. The diameter of the large steel ball 4 is larger than the wall thickness of the inner shaft 7 at this point. The inner sleeve 5 is provided with a second boss 503, one end of the spring 6 is mounted on the second boss 503, and the other end is mounted on the third boss 704, the second boss 503 and the third boss 704 appear in pairs, the spring 6, the second boss 503 and the third boss 704 are on the same arc along the inner shaft 7, the spring 6 is provided with two along the outer surface of the inner shaft 7, and is distributed in a centrally symmetrical form, and the number of pairs of the second boss 503 and the third boss 704 increases accordingly with the increase in the number of springs; In addition, the inner sleeve 5 is further provided with an inclined groove 501, the inclined surface of the inclined groove 501 corresponds to the large steel ball 4, and the large steel ball 4 can reciprocate back and forth along the long waist hole 702; the inner sleeve 5 is further provided with a second small steel ball through hole 504, and the second small steel ball through hole 504 and the first small steel ball through hole 703 can overlap with each other when the inner sleeve 5 rotates to be held immovable by the large steel ball 4, and the diameter of the second small steel ball through hole 504 is not less than the diameter of the first small steel ball through hole 703, see Figure 4As shown. The outer shell 2 drives the inner sleeve 5 to rotate along the inner shaft 7. In this solution, the first boss 202 provided on the outer shell 2 and the second groove 502 provided on the inner sleeve 5 are used to cooperate with each other so that the outer shell 2 drives the inner sleeve 5 to rotate along the inner shaft 7; as another solution, the groove provided on the outer shell 2 and the boss provided on the inner sleeve 5 can be used to cooperate with each other so that the outer shell 2 drives the inner sleeve 5 to rotate along the inner shaft 7; as another solution, the boss provided on the outer shell 2 and the groove provided on the inner sleeve 5 can be used to cooperate with each other, and the groove provided on the outer shell 2 and the boss provided on the inner sleeve 5 can be used to cooperate with each other. The two designs are used together so that the outer shell 2 drives the inner sleeve 5 to rotate along the inner shaft 7. The small steel ball 8 is arranged in the first small steel ball through hole 703 in an up and down movable state along a direction perpendicular to the surface of the inner shaft 7. The position of the small steel ball 8 is limited in the first small steel ball through hole 703. The diameter of the small steel ball 8 is larger than the wall thickness of the inner shaft 7 at this point.

[0064] In this solution, the inclined groove 501, the large steel ball 4 and the long waist hole 702 are matched into a group, and there are 2 groups, which are axially symmetrically arranged; the small steel ball 8, the first small steel ball through hole 703 and the second small steel ball through hole 504 are matched into a group, and there are 3 groups, which are arranged every 120 degrees.

[0065] As another solution, the pressing ring 9 is detachable or integrally formed with the inner shaft 7, and is used to limit the position of the small steel ball 8 so that the small steel ball 8 can maintain an up and down movable state in the first small steel ball through hole 703 along a direction perpendicular to the surface of the inner shaft 7; the structure of the pressing ring 9 is an open straight cylinder with a larger upper part and a smaller lower part, and the diameter of the larger opening side of the pressing ring 9 is adapted to the diameter of the small steel ball 8. When performing the pressing ring operation, the larger opening side of the pressing ring 9 first contacts the small steel ball 8.

[0066] As another solution, the retaining spring 3 can be replaced by a limiting bolt, and a threaded hole is opened on the inner surface of the inner shaft 7. The threaded hole is adapted to the limiting bolt and is used to fix the position of the housing 2.

[0067] As another solution, the retaining spring 3 can be replaced by a limiting nut, and a thread is provided at the position of the retaining spring groove 701, and the thread is adapted to the limiting nut.

[0068] As another solution, the retaining spring 3 can be replaced by a limiting protrusion, and the limiting protrusion can be arranged at the retaining spring groove 701. The limiting protrusion is an elastic protrusion. When external force intervenes, the limiting protrusion can be hidden. At this time, the position of the retaining spring groove 701 is a plane, and will not limit the position of the shell 2; when the external force intervention disappears, the limiting protrusion pops up to limit the position of the shell 2.

[0069] As another solution, the retaining ring 3 can be replaced by a limiting ring, and the limiting ring is installed at the position of the retaining ring groove 701 to fix the position of the housing 2.

[0070] As another solution, the retaining spring 3 may be replaced by any combination of a limiting bolt, a limiting nut, a limiting bump or a limiting ring.

[0071] As another solution, the spring 6 is a tension spring. When an external force is applied to the plug end 1, the plug end 1 and the socket end are plugged together to cause the housing 2 to rotate, the tension spring is stretched and deformed, and the large steel ball 4 moves along the inclined surface of the inclined groove 501 to the right end of the long waist hole 702. Figure 3 As shown; when the big steel ball 4 moves to the rightmost end of the long waist hole 702, the long waist hole 702, the big steel ball 4 and the first groove 201 are in the same straight line, and the big steel ball 4 can enter the first groove 201, thereby eliminating the obstruction of the big steel ball 4 to the plug end 1, and the plug end and the socket end are plugged into place, and the big steel ball 4 is partially located in the steel ball groove 101. The outer shell 2 drives the inner sleeve 5 to return to its original state under the action of the elastic force of the tension spring, and the big steel ball 4 restricts the plug end 1 in the socket end to prevent it from separating.

[0072] As another solution, the spring 6 is a compression spring, and a groove is provided on the inner shaft 7 for installing the compression spring. Fig. 9 As shown, when an external force is applied to the plug end 1, the plug end 1 and the socket end are plugged together, causing the housing 2 to rotate and the compression spring to be compressed and deformed. The rest of the process is the same as that of the spring 6 being a tension spring.

[0073] As another solution, the spring 6 is partly a compression spring and partly a tension spring, and a groove is opened on the inner shaft 7 for installing the compression spring; when the inner sleeve 5 rotates, the resistance force provided by the compression spring to the external load pressure and the return force of the tension spring to the external load pressure remain in the same direction.

[0074] As another solution, the long waist hole 702 is in an open state with a larger upper part and a smaller lower part, and the cross-sectional shape of the long waist hole 702 is a trapezoid, the upper opening width of the long waist hole 702 is larger than the diameter of the large steel ball 4, and the lower opening width is smaller than the diameter of the large steel ball 4, so that the large steel ball 4 is kept in the long waist hole 702 and is in a movable state; in addition, the long waist hole 702 can also be provided with a pressure ring to further limit the large steel ball 4 from moving up and down along the surface of the inner shaft 7 in the long waist hole 702. In addition, the long waist hole 702 can also be set to an elliptical cross-sectional shape to limit the large steel ball 4 from moving in the long waist hole 702.

[0075] As another solution, the bottom of the opening corresponding to the inclined groove 501 is arc-shaped, and the radius of the arc must not be less than the radius of the large steel ball 4.

[0076] As another solution, the outer shell 2 is provided with an anti-slip structure, which can be a combination of spiral grooves or spiral patterns or convex points or concave points, or more, to prevent hand slippage when locking or unlocking the locking device.

[0077] As another solution, the plug end 1 is further provided with a flange 102 for connecting the head and tail of the plug end; the flange 102 is usually circular or square in shape.

[0078] As another solution, the number of the large steel ball 4 and / or the small steel ball 8 is at least one.

[0079] As another solution, the number of the spring 6 is at least one.

[0080] Unless otherwise specified above, the materials used in the rotary steel ball locking device described in the present invention are all made of metal.

[0081] The working process of the rotary steel ball locking device is as follows:

[0082] (1) Locking process: When the plug end and the socket end are plugged together, hold the socket end with one hand and the plug end with the other hand, and push the plug end with force. The plug end 1 first contacts the large steel ball 4, and the large steel ball 4 applies a force rotating along the circumferential direction of the inner shaft 7 to the inner sleeve 5 through the inclined surface of the inclined groove 501. This force causes the spring to deform and generate a resistance to the force. At this time, the inner sleeve 5 drives the outer shell 2 to rotate; the plug end 1 continues to move forward and contacts the small steel ball 8. At this time, the second small steel ball through hole 504 on the inner sleeve 5 rotates to the position of the small steel ball 8, and the small steel ball 8 moves outward. The large steel ball 4 just moves to the arc bottom of the inclined groove 501 and the rightmost end of the long waist hole 702 (see Figure 3 As shown) and the first groove 201, the big steel ball 4 moves outward; the plug end 1 continues to move forward, at this time the big steel ball 4 and the small steel ball 8 are both in the steel ball groove 101 position on the plug end 1, the plug end and the socket end are plugged in place, at this time the inner sleeve 5 rotates in the opposite direction under the elastic force of the spring 6 to return to the original state, the second small steel ball through hole 504 on the inner sleeve 5 leaves the small steel ball 8 position, pushing the small steel ball 8 to move inward, at the same time, the inclined surface of the inclined groove 501 on the inner sleeve 5 pushes the big steel ball 4 to move toward the long waist hole 702 until the leftmost end (see Figure 3 As shown), the large steel ball 4 and the small steel ball 8 are locked in the steel ball groove 101 of the plug end 1 at the same time, so as to realize the locking of the plug end and the socket end.

[0083] (2) Unlocking process: When the plug end and the socket end are separated, hold the plug end with one hand and the socket end with the other hand, and rotate the outer shell 2 by hand until it stops rotating. The outer shell 2 drives the inner sleeve 5 to rotate. At this time, the second small steel ball through hole 504 on the inner sleeve 5 is rotated to coincide with the first small steel ball through hole 703, the inclined groove 501 on the inner sleeve 5 coincides with the long waist hole 702 in a large area, and the first groove 201 set on the outer shell 2 also coincides with the long waist hole 702. The large steel ball 4 just moves to the rightmost end of the long waist hole 702 (see details). Figure 3 As shown); apply force to the plug end and the socket end in opposite directions, the small steel ball 8 is partially squeezed into the second small steel ball through hole 504 by the plug end 1, and the large steel ball 4 is squeezed into the first groove 201 provided on the shell 2; the plug end 1 and the socket end are separated, and the shell 2 is released after separation, and the inner sleeve 5 and the shell 2 are rotated and reset under the action of the elastic force of the spring 6.

[0084] The connector using the rotary steel ball locking device created by the present invention includes any of the rotary steel ball locking devices. In addition, the connector also includes a pin 103 and a socket 104, the pin 103 is arranged in the plug end 1, the socket 104 is arranged in the socket end, the pin 103 and the socket 104 are matched with each other, and the tail end of the connector is connected to the external circuit through a wire, specifically see Figures 6 to 8 shown.

[0085] Unless otherwise specified, the terms "disposed", "connected" and "connected" in the present invention should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the connection between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0086] The above only expresses several implementation methods of the present invention. The technical features of the above embodiments can be combined arbitrarily. In order to make the description concise and clear, not all possible combinations of the technical features of the above embodiments are described one by one. However, as long as there is no contradiction in the combination of these technical features, they should be considered to belong to the scope of protection of the present invention.

Claims

1. A rotary steel ball locking device, comprising a plug end (1) and a socket end, wherein the plug end (1) is provided with a steel ball groove (101) in the circumferential direction; the socket end comprises an inner sleeve (5), an inner shaft (7), an outer shell (2), a large steel ball (4) and a spring (6), characterized in that: The inner shaft (7) is axially provided with a long waist hole (702), the large steel ball (4) is arranged in the long waist hole (702) in a movable state, the position of the large steel ball (4) is limited in the long waist hole (702), the diameter of the large steel ball (4) is larger than the wall thickness of the inner shaft (7) at this location, and the inner shaft (7) is also provided with a third boss (704); The inner sleeve (5) is provided with a second boss (503), one end of the spring (6) is mounted on the second boss (503), and the other end is mounted on the third boss (704), the spring (6), the second boss (503) and the third boss (704) are on the same arc along the inner shaft (7), the inner sleeve (5) is also provided with a bevel groove (501), the bevel of the bevel groove (501) corresponds to the large steel ball (4), and the large steel ball (4) can reciprocate back and forth along the long waist hole (702); the inner side of the outer shell (2) is provided with a first groove (201), and the outer shell (2) drives the inner sleeve (5) to move along the inner shaft (702). The inner shaft (7) performs a rotational motion, and when the first groove (201) is rotated until it is held immobile by the large steel ball (4), the large steel ball (4) can enter the first groove (201), thereby eliminating the obstruction of the large steel ball (4) on the plug end (1), and the plug end (1) and the socket end are plugged into place, and the large steel ball (4) is partially located in the steel ball groove (101). The outer shell (2) drives the inner sleeve (5) to return to its original state under the action of the elastic force of the spring (6), and the large steel ball (4) restricts the plug end (1) within the socket end to prevent it from separating.

2. A rotary steel ball locking device according to claim 1, characterized in that: The number of the springs (6) is two, and the springs (6) are distributed on the inner shaft (7) in a centrally symmetrical manner.

3. A rotary steel ball locking device according to claim 1, characterized in that: The inner shaft (7) is also provided with a first small steel ball through hole (703), and the socket end also includes a small steel ball (8). The small steel ball (8) is arranged in the first small steel ball through hole (703) in an active state, and the position of the small steel ball (8) is limited in the first small steel ball through hole (703). The diameter of the small steel ball (8) is greater than the wall thickness of the inner shaft (7) at this location; the inner sleeve (5) is also provided with a second small steel ball through hole (504), and the second small steel ball through hole (504) and the first small steel ball through hole (703) can overlap with each other when the inner sleeve (5) is rotated to be pressed by the large steel ball (4) and cannot move.

4. A rotary steel ball locking device according to claim 1, characterized in that: The outer shell (2) is also provided with a first boss (202), and the inner sleeve (5) is also provided with a second groove (502). The first boss (202) and the second groove (502) are matched with each other so that the outer shell (2) drives the inner sleeve (5) to rotate along the inner shaft (7).

5. A rotary steel ball locking device according to claim 1, characterized in that: The outer shell (2) is also provided with a groove, and the inner sleeve (5) is also provided with a boss. The boss corresponds to and cooperates with the groove so that the outer shell (2) drives the inner sleeve (5) to perform rotational movement along the inner shaft (7).

6. A rotary steel ball locking device according to claim 1, characterized in that: The socket end also includes a limiting component for limiting the position of the housing (2).

7. A rotary steel ball locking device according to claim 6, characterized in that: The limiting component is a retaining spring (3), the inner shaft (7) is further provided with a circle of retaining spring grooves (701) for installing the retaining spring (3), and the outer shell (2) further comprises a step (203) which is arranged corresponding to the retaining spring (3).

8. A rotary steel ball locking device according to claim 6, characterized in that: The limiting component is a limiting bolt, a limiting nut, a limiting bump, or a limiting ring, or a combination of the above.

9. The rotary steel ball locking device according to claim 3, characterized in that: The socket end also includes a detachable pressure ring (9) for limiting the position of the small steel ball (8), so that the small steel ball (8) can remain active in the first small steel ball through hole (703).

10. A rotary steel ball locking device according to claim 3, characterized in that: The socket end also includes a pressure ring (9) integrally formed with the inner shaft (7) and used to limit the position of the small steel ball (8), so that the small steel ball (8) can remain active in the first small steel ball through hole (703).

11. A rotary steel ball locking device according to claim 2, characterized in that: The spring (6) is a tension spring and / or a compression spring.

12. A rotary steel ball locking device according to claim 1, characterized in that: The long waist hole (702) is in an open state with a larger upper portion and a smaller lower portion, and the cross-sectional shape of the long waist hole (702) is a trapezoid.

13. A rotary steel ball locking device according to claim 1, characterized in that: The bottom of the opening corresponding to the inclined groove (501) is arc-shaped.

14. A rotary steel ball locking device according to claim 1, characterized in that: The outer surface of the shell (2) is provided with an anti-slip structure.

15. A rotary steel ball locking device according to claim 14, characterized in that: The anti-slip structure is one or a combination of spiral grooves, spiral patterns, convex points or concave points.

16. A rotary steel ball locking device according to claim 1, characterized in that: The plug end (1) further comprises a flange (102), and the flange (102) is square or circular.

17. A connector, comprising any one of the rotary steel ball locking devices according to claims 1 to 16.

18. A connector according to claim 17, comprising a pin (103) and a socket (104), wherein the pin (103) is arranged in the plug end (1), and the socket (104) is arranged in the socket end, and the pin (103) and the socket (104) correspond to each other.

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