Pop-up device with self-locking function

Abstract

The utility model discloses a pop-up device with a self-locking function, which comprises a socket, a movable ejector rod and an ejector rod spring, a positioning piece with a mounting cavity inside is arranged in the socket, and the left end of the ejector rod spring and the left end of the movable ejector rod are arranged in the mounting cavity. The right end of the movable ejector rod penetrates through the positioning pipe and is arranged outside the right end of the positioning pipe; a limiting ring is movably arranged outside the positioning pipe in a sleeving mode, a plurality of through holes are annularly and evenly distributed in the outer surface of the positioning pipe, a limiting ball is installed in each through hole, the diameter of each limiting ball is larger than the wall thickness of the positioning pipe, an annular pushing groove is formed in the inner surface of the limiting ring, and a limiting groove is formed in the outer surface of the limiting ring. An annular limiting groove is formed in the outer surface of the movable ejector rod; a driving mechanism is further arranged in the socket and drives the limiting ring to move left and right along the positioning pipe. According to the utility model, the plug pop-up performance is improved, and the maintenance rate is reduced.

Description

Technical Field

[0001] The utility model relates to a charging gun, in particular to a pop-up device with a self-locking function. Background Art

[0002] New energy vehicles refer to vehicles that use unconventional vehicle fuels as a power source (or use conventional vehicle fuels and new vehicle-mounted power devices), and integrate advanced technologies in vehicle power control and drive to form vehicles with advanced technical principles, new technologies, and new structures. Among them, vehicles that use charging methods generally need to be charged by charging guns to charge new energy electric vehicles. Of course, other products or equipment that need to be charged can also be charged by charging guns.

[0003] In the prior art, in order to realize that the plug is automatically ejected from the socket, see Figure 1 , 2 As shown, a plug push rod 102 is provided on the plug 101, a boss 103 is provided on the outer surface of the plug 101, a spring 105 and a cover plate 106 are provided on the socket 104, and a hook 107 is provided on the cover plate 106. When the plug and the socket are plugged in, the plug push rod is inserted into the socket to compress the spring, and then the hook on the cover plate will hook the boss, so that the plug is limited in the socket. After the plug is inserted into the socket, due to the compression of the spring, it has a restoring force, that is, the plug has a tendency to be ejected. When the hook and the boss of the cover plate are separated (the cover plate and the boss can be separated manually or automatically), the spring will eject the plug from the socket, so that the plug is automatically ejected. However, this structure has the following shortcomings:

[0004] 1. In order to reduce the pulling force of the boss on the hook, which makes the cover plate or the hook easy to be damaged (especially in the process of separation of the cover plate and the boss, the hook is not only subjected to the force of the boss away from the socket, but also to the force of its rotation to separate from the boss, which makes it more prone to damage), in general, the spring will choose a smaller elastic force to prevent damage to the cover plate and the hook; because the spring force is relatively small, when the plug needs to be ejected, there will be insufficient spring force, resulting in the phenomenon that the plug cannot be ejected (the tight fit between the plug and the socket is relatively small, or the spring has insufficient elastic force after being used for a period of time), thereby affecting the user experience and requiring manual assistance to remove the plug from the socket;

[0005] 2. If the hook of the cover is damaged, the plug will be automatically pushed out by the spring when it is inserted into the socket, resulting in the inability to make a normal electrical connection between the plug and the socket. Summary of the invention

[0006] The utility model aims to provide a pop-up device with a self-locking function. By using this structure, it can be ensured that after the plug is inserted into the socket, the movable push rod is limited by the limiting ball and the plug will not be ejected, so that self-locking can be achieved and the subsequent automatic pop-up performance of the plug can be guaranteed.

[0007] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a pop-up device with a self-locking function, comprising a socket, a movable ejector rod and an ejector rod spring installed in the socket, a positioning piece with an installation cavity inside is provided in the socket, the ejector rod spring and the left end of the movable ejector rod are arranged in the installation cavity, the ejector rod spring gives the movable ejector rod a rightward thrust, the right end of the positioning piece is provided with a coaxially arranged positioning tube, and the right end of the movable ejector rod passes through the positioning tube and is arranged outside the right end of the positioning tube;

[0008] The outer movable sleeve of the positioning tube is provided with a limiting ring, and a plurality of through holes are evenly distributed in an annular shape on the outer surface of the positioning tube and are connected to the inside of the positioning tube. A limiting ball is installed in each of the through holes, and the diameter of the limiting ball is greater than the wall thickness of the positioning tube. An annular push groove is provided on the inner surface of the limiting ring, and an annular limiting groove is provided on the outer surface of the movable push rod;

[0009] A driving mechanism is also provided in the socket, and the driving mechanism drives the limiting ring to move left and right along the positioning tube;

[0010] When the movable push rod moves to the left to compress the push rod spring and the annular limiting groove faces the through hole, the driving mechanism drives the limiting ring to move to the right, the annular push groove moves to the right and pushes the limiting ball inward into the annular limiting groove;

[0011] When the driving mechanism drives the limiting ring to move leftward, the push rod spring pushes the movable push rod to move rightward, and when the annular limiting groove moves rightward, the limiting ball is pushed outward, so that the outer end of the limiting ball moves outward in the annular push groove.

[0012] In the above technical solution, the driving mechanism includes a right-pushing mechanism and a left-pushing mechanism, the left-pushing mechanism pushes the limiting ring to move rightward, and the right-pushing mechanism pushes the limiting ring to move leftward.

[0013] In the above technical solution, the left-push mechanism includes a limit spring, which is sleeved on the outside of the positioning tube, the left side of the limit spring abuts against the right side surface of the positioning member, and the right side of the limit spring abuts against the left end of the limit ring, and the limit spring pushes the limit ring to move to the right.

[0014] In the above technical solution, the right push mechanism includes a connecting rod, an iron core and a coil, the coil is arranged beside the positioning member, the left end of the iron core is movably arranged in the coil, a connecting hole is arranged in the middle of the connecting rod, an annular groove is arranged on the outer surface of the right end of the limiting ring, the outer diameter of the connecting hole is larger than the outer diameter of the annular groove, the outer diameter of the connecting hole is smaller than the outer diameter of the limiting ring, the connecting hole is sleeved on the outside of the annular groove, the top of the connecting rod is rotatably connected to the right end of the iron core, the bottom of the connecting rod is arranged close to the right end inner wall of the socket, or the right side of the bottom of the connecting rod contacts the right end inner wall of the socket;

[0015] And / or, when the coil is energized, the coil drives the iron core to move to the left, and pulls the top of the connecting rod to move to the left, so that the left end of the connecting rod contacts the left side of the annular groove, and drives the limit ring to move to the left.

[0016] In the above technical solution, the left side surface of the annular push groove is an inclined surface, and the inclined surface is inclined from the outside to the inside and is arranged to the left.

[0017] In the above technical solution, a stop ring is installed on the positioning tube on the right side of the through hole, and when the stop ring moves to the right, the right end of the stop ring abuts against the left side surface of the stop ring.

[0018] In the above technical solution, an annular mounting groove is provided on the outer surface of the positioning tube on the right side of the through hole, the inner end of the stop ring is installed in the annular mounting groove, and the outer surface of the stop ring is arranged outside the positioning tube.

[0019] In the above technical solution, a limit head is provided on the left side of the movable push rod, the outer diameter of the limit head is larger than the inner diameter of the positioning tube, the limit head is arranged in the installation cavity, and the right side of the push rod spring abuts against the left side surface of the limit head.

[0020] In the above technical solution, when the push rod spring is in the extended state, the annular limiting groove is arranged on the right side of the limiting ball, and when the push rod spring is in the compressed state, the annular limiting groove is arranged opposite to the limiting ball.

[0021] In the above technical solution, when the limiting ring moves to the right, the annular push groove is arranged on the right side of the limiting ball, and the inner surface of the limiting ring is arranged opposite to the limiting ball;

[0022] When the limiting ring moves to the left, the annular push groove is arranged opposite to the limiting ball.

[0023] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art:

[0024] 1. In the utility model, a limit ring is movably sleeved on the outside of the positioning tube, and the limit ring is driven to move left and right by a driving mechanism. The position of the limit ball is pushed by the left and right movement of the limit ring, so that when the plug is inserted into the socket and the movable ejector rod is pushed to the left, the limit ball is pushed into the annular limit groove of the movable ejector rod by the limit ring, thereby realizing the self-locking limit of the movable ejector rod. In this way, the ejector rod spring can adopt a larger spring force, which can not only ensure the ejection force when the plug needs to be ejected, but also ensure that the plug can be ejected smoothly and automatically, and can also ensure the electrical connection performance of the two when the plug and the socket are plugged in. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Structural diagram of the background technology (when the plug and the socket are plugged in);

[0026] Figure 2 Structural diagram of the background technology (when the plug and the socket are separated);

[0027] Figure 3 This is a schematic diagram of the structure of the first embodiment of the present utility model (when the plug and the socket are plugged in);

[0028] Figure 4 yes Figure 3 A partial enlarged view of the middle limit ring;

[0029] Figure 5 This is a schematic diagram of the structure of the first embodiment of the present utility model (when the movable ejector ejects the plug from the socket);

[0030] Figure 6 yes Figure 5 A partial enlarged view of the middle limit ring.

[0031] Wherein: 1. socket; 2. movable ejector pin; 3. ejector pin spring; 4. positioning member; 5. mounting cavity; 6. positioning tube; 7. limiting ring; 8. through hole; 9. limiting ball; 10. annular push groove; 11. annular limiting groove; 12. plug; 13. fixed ejector pin; 14. cover plate; 15. hook; 16. convex part; 17. limiting spring; 18. connecting rod; 19. iron core; 20. coil; 21. connecting hole; 22. annular groove; 23. inclined surface; 24. retaining ring; 25. annular mounting groove; 26. limiting head; 101. plug; 102. plug ejector pin; 103. boss; 104. socket; 105. spring; 106. cover plate; 107. hook. DETAILED DESCRIPTION

[0032] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0033] Example 1: See Figures 3 to 6As shown, a pop-up device with a self-locking function includes a socket 1, a movable push rod 2 and a push rod spring 3 installed in the socket 1, a positioning member 4 is provided in the socket, and a mounting cavity 5 is provided inside the positioning member 4. The push rod spring and the left end of the movable push rod 2 are arranged in the mounting cavity 5, and the push rod spring gives the movable push rod 2 a rightward thrust, and a coaxially arranged positioning tube 6 is provided at the right end of the positioning member 4, and the right end of the movable push rod 2 passes through the positioning tube 6 and is arranged outside the right end of the positioning tube 6; and the movable push rod and the positioning tube are movably connected.

[0034] The outer movable sleeve of the positioning tube 6 is provided with a limiting ring 7, and a plurality of through holes 8 are evenly distributed in an annular manner on the outer surface of the positioning tube 6 and are connected to the inside of the positioning tube 6. A limiting ball 9 is installed in each of the through holes 8, and the diameter of the limiting ball 9 is greater than the wall thickness of the positioning tube 6. An annular push groove 10 is provided on the inner surface of the limiting ring 7, and an annular limiting groove 11 is provided on the outer surface of the movable push rod 2;

[0035] The socket 1 is also provided with a driving mechanism, which drives the limiting ring 7 to move left and right along the positioning tube 6;

[0036] When the movable push rod moves to the left to compress the push rod spring and the annular limiting groove faces the through hole, the driving mechanism drives the limiting ring to move to the right, the annular push groove moves to the right and pushes the limiting ball inward into the annular limiting groove;

[0037] When the driving mechanism drives the limiting ring to move to the left, the limiting ring releases the inward extrusion limit on the limiting ball, and the push rod spring pushes the movable push rod to move to the right. When the annular limiting groove moves to the right, the limiting ball is pushed outward, so that the outer end of the limiting ball moves outward into the annular push groove.

[0038] In this embodiment, in actual use, the socket is used for plugging in a plug, and a fixed push rod 13 is provided on the plug 12, and the fixed push rod is arranged opposite to the movable push rod. A cover plate 14 is rotatably installed on the right side of the socket 1, and a hook 15 is provided on it. A convex portion 16 is provided on the outer surface of the plug. When the plug is inserted into the socket, the fixed push rod pushes the movable push rod to move to the left, and the push rod spring is compressed. When the plug is plugged in place, the hook of the cover plate will hook the convex portion of the plug, limiting the plug from moving to the right and leaving the socket. The plug will also be limited by the plug-in cooperation between the plug and the socket. At this time, after the movable push rod moves to the left and reaches the predetermined position, the annular limit groove will face the through hole, that is, the limit ball. In this embodiment, the limit ball is a steel ball. Then the driving mechanism drives the limit ring to move to the right. When the limit ring moves to the right, the annular push groove moves to the right synchronously, and the limit ball is pushed toward the inner end of the through hole through the annular push groove, so that the limit ball is pushed into the annular limit groove, and the movable push rod is axially limited. In this way, the restoring force of the push rod spring cannot push the movable push rod to move to the right. Even if the hook and the convex part of the cover plate are separated, the movable push rod is axially limited by the limit ring, the limit ball and the annular limit groove, so that the movable push rod will not move to the right, which can prevent the plug from being ejected by the movable push rod. At the same time, due to the existence of the limit ring, the limit ball and the annular limit groove, the push force of the push rod spring to the right given to the movable push rod will not be directly transmitted to the plug, that is, the hook will not be subjected to additional thrust, so that the elastic force of the push rod spring can be selected to be larger, and the hook of the cover plate is not easily damaged. Moreover, even if the hook is damaged, the plug is inserted into the socket and the plug will not be ejected by the movable push rod, which can ensure the normal plugging of the plug and the socket and the charging work. When the plug needs to be ejected, the driving mechanism drives the limit ring to move to the left, so that the limit ring will synchronously drive the annular push groove to move to the left, so that the annular push groove faces the limit ball. Due to the elastic force of the ejector spring, the ejector spring always gives the movable ejector a rightward thrust. Since the annular push groove faces the limit ball, that is, space is given to the limit ball to move outward, the ejector spring pushes the movable ejector to move to the right, so that the annular limit groove will also follow and move to the right, pushing the limit ball to move outward along the through hole (the limit ball is a spherical structure with an arc surface on the outer surface, so it can smoothly push the limit ball to move outward along the through hole), so that the outer end of the limit ball moves into the annular push groove, and the movable ejector also moves to the right normally, pushing the fixed ejector to move to the right, and through the rightward movement of the fixed ejector, the plug is synchronously driven to move to the right (the hook of the cover plate will be separated from the convex part in advance), thereby realizing the automatic ejection of the plug.

[0039] See also Figures 3 to 6 As shown, the driving mechanism includes a right push mechanism and a left push mechanism, the left push mechanism pushes the limit ring to move rightward, and the right push mechanism pushes the limit ring to move leftward.

[0040] The left-push mechanism includes a limit spring 17, which is sleeved on the outside of the positioning tube 6. The left side of the limit spring 17 abuts against the right side surface of the positioning member 4, and the right side of the limit spring 17 abuts against the left end of the limit ring 7. The limit spring 17 pushes the limit ring 7 to move to the right.

[0041] The right push mechanism includes a connecting rod 18, an iron core 19 and a coil 20, wherein the coil 20 is arranged beside the positioning member 4, and the left end of the iron core 19 is movably arranged in the coil 20. A connecting hole 21 is arranged in the middle of the connecting rod 18, and an annular groove 22 is arranged on the outer surface of the right end of the limiting ring 7. The outer diameter of the connecting hole 21 is larger than the outer diameter of the annular groove 22, and the outer diameter of the connecting hole 21 is smaller than the outer diameter of the limiting ring 7. The connecting hole 21 is sleeved on the outside of the annular groove 22. The top of the connecting rod 18 is rotatably connected to the right end of the iron core 19, and the bottom of the connecting rod 18 is arranged close to the inner wall of the right end of the socket 1, or the right side of the bottom of the connecting rod is in contact with the inner wall of the right end of the socket; in this embodiment, the right side of the bottom of the connecting rod is arranged close to the inner wall of the right end of the socket, and the distance between the two is relatively small. When the iron core moves to the left, the right side of the bottom of the connecting rod will abut against the inner wall of the right end of the socket, so that the connecting rod drives the limiting ring to move to the left.

[0042] When the coil is energized, it generates a magnetic field, and the iron core inside the coil is magnetized to generate magnetic force and move to the left, thereby driving the iron core to move to the left through the coil, and pulling the top of the connecting rod to move to the left, so that the left end of the connecting rod contacts the left side of the annular groove, and drives the limit ring to move to the left.

[0043] In this embodiment, after the plug is inserted into the socket and drives the movable push rod to move to the left, the coil is not energized, so that the restoring force of the limit spring will push the limit ring to move to the right, and the rightward movement of the limit ring will push the connecting rod to move to the right, so that the top of the connecting rod and the iron core also move to the right. In this way, when the limit ring moves to the right, the annular push groove moves to the right and pushes the limit ball toward the inner end of the through hole (the spacing between the outer surface of the annular push groove and the inner surface of the positioning tube will be greater than or equal to the diameter of the ball, and the distance from the inner surface of the limit ring to the inner surface of the positioning tube is less than the diameter of the ball). When the annular push groove completely passes through the through hole, the limit ball is limited by the inner surface of the limit ring, so that the inner end of the limit ball is limited in the annular limit groove. When the plug needs to be ejected, the coil is energized to move the iron core to the left, which will pull the top of the connecting rod to the left. Since the right side of the bottom of the connecting rod is in contact with the inner wall of the right end of the plug, the connecting rod is tilted to the left from bottom to top, and the limiting ring is pushed to the left by the connecting rod to compress the limiting spring, so that the annular push groove moves to the through hole. Since the limiting force of the limiting ring on the limiting ball disappears, the push rod spring can normally push the movable push rod to move to the right, and the annular limiting groove pushes the limiting ball to move outward, thereby realizing automatic ejection of the plug.

[0044] At the same time, the connecting rod adopts the lever principle, and the right end of the connecting rod is limited by the inner wall of the socket, so that the iron core is subjected to a smaller pulling force to the left, and can also drive the limiting ring to move to the left to compress the limiting spring.

[0045] Furthermore, the left side surface of the annular push groove 10 is an inclined surface 23, and the inclined surface 23 is inclined to the left from the outside to the inside.

[0046] In this way, when the limit ring moves to the right, the diameter of the annular push groove changes from large to small, so that the inclined surface of the annular push groove can smoothly push the limit ball to move inward and fit into the annular limit groove, thereby realizing axial limitation of the movable push rod.

[0047] See also Figures 3 to 6 As shown, a stop ring 24 is installed on the positioning tube 6 on the right side of the through hole 8. When the stop ring 24 moves to the right, the right end of the stop ring 7 abuts against the left side surface of the stop ring 24.

[0048] In this embodiment, when the limit spring is extended, in order to prevent the limit ring from moving too much to the right, the stop ring is used to limit the movement of the limit ring and the positioning member, thereby limiting the movement of the limit ring.

[0049] See also Figures 3 to 6 As shown, an annular mounting groove 25 is provided on the outer surface of the positioning tube 6 on the right side of the through hole 8, the inner end of the stop ring 24 is installed in the annular mounting groove 25, and the outer surface of the stop ring 24 is arranged on the outside of the positioning tube 6.

[0050] The annular mounting groove is provided for the installation of the stop ring.

[0051] See also Figures 3 to 6 As shown, a limit head 26 is provided on the left side of the movable push rod 2, the outer diameter of the limit head 26 is larger than the inner diameter of the positioning tube 6, the limit head 26 is arranged in the installation cavity 5, and the right side of the push rod spring 3 is against the left side surface of the limit head.

[0052] The setting of the limit head can prevent the left end of the movable push rod from moving into the positioning tube, so that the axial movement distance of the movable push rod is limited by the push rod spring, the limit head and the positioning member.

[0053] See also Figure 4 , 6 As shown, when the push rod spring is in the extended state, the annular limiting groove is arranged on the right side of the limiting ball, and when the push rod spring is in the compressed state, the annular limiting groove is arranged opposite to the limiting ball.

[0054] In this way, when the plug is inserted into the socket, the axial limit of the movable push rod can be limited by the limiting ball, and when the plug is separated from the socket, the limiting ball will also be separated from the annular limiting groove.

[0055] When the limiting ring moves to the right, the annular push groove is arranged on the right side of the limiting ball, and the inner surface of the limiting ring is arranged opposite to the limiting ball;

[0056] When the limiting ring moves to the left, the annular push groove is arranged opposite to the limiting ball.

[0057] In this way, the limiting ring can be moved and the annular push groove can be used to give the limiting ball a space to move outward, or in other words, the limiting ball can be pushed to move outward through the annular push groove.

[0058] In the description of the present invention, it should be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0059] In the present utility model, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, or a detachable connection, or an integral one; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, for example, the two can form a mechanical abutment or abutment connection through abutment, contact, etc., the two can also be directly hung or hung through an intermediate medium, etc., or it can be the internal connection of the two elements or the interaction relationship between the 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.

Claims

1. A pop-up device with a self-locking function, comprising a socket, a movable ejector rod installed in the socket, and an ejector rod spring, wherein a positioning member having an installation cavity is provided in the socket, the ejector rod spring and the left end of the movable ejector rod are arranged in the installation cavity, and the ejector rod spring gives the movable ejector rod a rightward thrust, characterized in that: The right end of the positioning member is provided with a coaxially arranged positioning tube, and the right end of the movable push rod passes through the positioning tube and is arranged outside the right end of the positioning tube; The outer movable sleeve of the positioning tube is provided with a limiting ring, and a plurality of through holes are evenly distributed in an annular shape on the outer surface of the positioning tube and are connected to the inside of the positioning tube. A limiting ball is installed in each of the through holes, and the diameter of the limiting ball is greater than the wall thickness of the positioning tube. An annular push groove is provided on the inner surface of the limiting ring, and an annular limiting groove is provided on the outer surface of the movable push rod; A driving mechanism is also provided in the socket, and the driving mechanism drives the limiting ring to move left and right along the positioning tube; When the movable push rod moves to the left to compress the push rod spring and the annular limiting groove faces the through hole, the driving mechanism drives the limiting ring to move to the right, the annular push groove moves to the right and pushes the limiting ball inward into the annular limiting groove; When the driving mechanism drives the limiting ring to move leftward, the push rod spring pushes the movable push rod to move rightward, and when the annular limiting groove moves rightward, the limiting ball is pushed outward, so that the outer end of the limiting ball moves outward in the annular push groove.

2. The ejection device with self-locking function according to claim 1, characterized in that: The driving mechanism comprises a right push mechanism and a left push mechanism, wherein the left push mechanism pushes the limit ring to move rightward, and the right push mechanism pushes the limit ring to move leftward.

3. The ejection device with self-locking function according to claim 2, characterized in that: The left-push mechanism includes a limit spring, which is sleeved on the outside of the positioning tube. The left side of the limit spring abuts against the right side surface of the positioning member, and the right side of the limit spring abuts against the left end of the limit ring. The limit spring pushes the limit ring to move to the right.

4. The ejection device with self-locking function according to claim 2, characterized in that: The right push mechanism comprises a connecting rod, an iron core and a coil, wherein the coil is arranged beside the positioning member, the left end of the iron core is movably arranged in the coil, a connecting hole is arranged in the middle of the connecting rod, an annular groove is arranged on the outer surface of the right end of the limiting ring, the outer diameter of the connecting hole is larger than the outer diameter of the annular groove, the outer diameter of the connecting hole is smaller than the outer diameter of the limiting ring, the connecting hole is sleeved on the outside of the annular groove, the top of the connecting rod is rotatably connected to the right end of the iron core, the bottom of the connecting rod is arranged close to the right end inner wall of the socket, or the right side of the bottom of the connecting rod contacts the right end inner wall of the socket; And / or, when the coil is energized, the coil drives the iron core to move to the left, and pulls the top of the connecting rod to move to the left, so that the left end of the connecting rod contacts the left side of the annular groove, and drives the limit ring to move to the left.

5. The ejection device with self-locking function according to claim 1, characterized in that: The left side surface of the annular push groove is an inclined surface, and the inclined surface is inclined from the outside to the inside and is arranged to the left.

6. The ejection device with self-locking function according to claim 1, characterized in that: A stop ring is installed on the positioning tube on the right side of the through hole. When the stop ring moves to the right, the right end of the stop ring abuts against the left side surface of the stop ring.

7. The ejection device with self-locking function according to claim 6, characterized in that: An annular mounting groove is provided on the outer surface of the positioning tube on the right side of the through hole, the inner end of the stop ring is installed in the annular mounting groove, and the outer surface of the stop ring is arranged outside the positioning tube.

8. The ejection device with self-locking function according to claim 1, characterized in that: A limit head is provided on the left side of the movable push rod, the outer diameter of the limit head is larger than the inner diameter of the positioning tube, the limit head is arranged in the installation cavity, and the right side of the push rod spring abuts against the left side surface of the limit head.

9. The ejection device with self-locking function according to claim 1, characterized in that: When the push rod spring is in an extended state, the annular limiting groove is arranged on the right side of the limiting ball; when the push rod spring is in a compressed state, the annular limiting groove is arranged opposite to the limiting ball.

10. The ejection device with self-locking function according to claim 1, characterized in that: When the limiting ring moves to the right, the annular push groove is arranged on the right side of the limiting ball, and the inner surface of the limiting ring is arranged opposite to the limiting ball; When the limiting ring moves to the left, the annular push groove is arranged opposite to the limiting ball.

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