Locking keeping and unlocking structure

Abstract

The utility model belongs to the technical field of sliding plug doors, and discloses a locking keeping and unlocking structure which comprises a locking keeping mechanism and an unlocking mechanism, the locking keeping mechanism comprises a first swing rod and a first elastic piece, the first swing rod is arranged on a door frame in a swing mode, a thread bushing is provided with a clamping groove, the first elastic piece is suitable for providing elastic force for the first swing rod, and the first swing rod is provided with a locking groove. The unlocking mechanism comprises a second swing rod and a traction piece, the second swing rod is arranged on the door frame in a swing mode and provided with a pushing end, the traction piece is arranged on the second swing rod, the traction piece drives the second swing rod to swing, and the second swing rod is clamped in the clamping groove when the door body moves to the locking position. And the pushing end of the second swing rod pushes the threaded sleeve so as to release the clamping between the first swing rod and the clamping groove. According to the locking keeping and unlocking structure, a pure mechanical structure is reliable and effective, the door body can be reliably locked when the sliding plug door is closed, and the door body can be unlocked emergently when the door body needs to be opened emergently.

Description

Technical Field

[0001] The utility model relates to the technical field of plug-type sliding doors, and in particular to a locking, holding and unlocking structure. Background Art

[0002] As a new type of bus door, the sliding door is gradually replacing the traditional inner swing door of the bus due to its higher safety, reliability and comfort.

[0003] In the prior art, the spiral drive used in the electric Sierra door system is generally a drive motor that drives the screw to rotate, driving the threaded sleeve set on the screw to perform reciprocating motion, and then driving the door body connected to the threaded sleeve to realize the opening and closing movement. For example, the patent document with publication number CN218991296U adopts the above-mentioned structure. However, the above-mentioned structure also has certain shortcomings. When applied to the occasion of a single-leaf Sierra door, the locking mechanism loses the locking mechanism on the other side to offset the inertia. There will be a hidden danger of unlocking in a vibrating environment, and the door body cannot be reliably locked. In addition, when the door body is closed, the force of the door body pressing against the car body will eventually be transmitted between the screw and the threaded sleeve, resulting in a large friction between the screw and the threaded sleeve. In emergency unlocking, a large thrust is required to unlock, which is inconvenient to operate and also aggravates the wear of the threaded meshing structure between the screw and the threaded sleeve. Utility Model Content

[0004] The purpose of the utility model is to provide a locking, holding and unlocking structure, which can reliably lock the door body when the Sierra door is closed, and can also urgently unlock the door body when the door body needs to be opened urgently.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] A locking, holding, and unlocking structure for a sliding plug door, the sliding plug door comprising a door frame and a door body, a screw being rotatably provided on the door frame, a threaded sleeve being provided on the door body, the threaded sleeve being slidable on the door frame along the axial direction of the screw, the threaded sleeve being sleeved on the screw and being threadedly connected to the screw, the locking, holding, and unlocking structure comprising:

[0007] The locking and holding mechanism includes a first swing lever and a first elastic member, wherein the first swing lever is swingably mounted on the door frame, the threaded sleeve is provided with a locking groove, and the first elastic member is adapted to provide elastic force to the first swing lever, so that the first swing lever swings and is locked in the locking groove when the door body moves to the locked position;

[0008] The unlocking mechanism includes a second rocker arm and a pulling member. The second rocker arm is swingably arranged on the door frame and has a pushing end. The pulling member is arranged on the second rocker arm. The pulling member can drive the second rocker arm to swing, so that the pushing end of the second rocker arm pushes against the threaded sleeve to release the jam between the first rocker arm and the slot.

[0009] Preferably, the locking and holding mechanism further comprises a tensioning member, the tensioning member being provided on the door frame, and a third stop wheel being rotatably provided on the tensioning member;

[0010] The third abutment wheel is adapted to abut tightly against the threaded sleeve when the door body moves to the locking position.

[0011] Preferably, the locking and holding mechanism includes a support, the support is fixedly arranged on the door frame, and the first rocker arm and the second rocker arm are both hingedly arranged on the support.

[0012] Preferably, the first rocker arm is hinged to the support via a first hinge shaft, the first elastic member is sleeved on the first hinge shaft, the first end of the first elastic member is connected to the first rocker arm, and the second end of the first elastic member is connected to the support.

[0013] Preferably, the unlocking mechanism further comprises a second elastic member, the second swing arm is hinged to the support via a second hinge shaft, the second elastic member is sleeved on the second hinge shaft, a first end of the second elastic member is connected to the second swing arm, and a second end of the second elastic member is connected to the support;

[0014] The second elastic member is configured to provide a force forcing the pushing end of the second swing rod to swing away from the threaded sleeve.

[0015] Preferably, the pulling member is provided at an end away from the pushing end of the second rocker arm, and the hinge shaft is located between the pushing end of the second rocker arm and the pulling member.

[0016] Preferably, the first elastic member and the second elastic member are both configured as torsion springs.

[0017] Preferably, the first swing arm is provided with a first abutting wheel capable of abutting against the slot, and the first abutting wheel is rotatably connected to the first swing arm;

[0018] The pushing end of the second swing rod is provided with a second pushing wheel capable of pushing and contacting the threaded sleeve, and the second pushing wheel is rotatably connected to the second swing rod.

[0019] Preferably, a locking frame is fixedly provided on the threaded sleeve, and the locking frame is provided with an L-shaped groove, and the L-shaped groove includes a first groove portion and a second groove portion that are connected to each other, the first groove portion is parallel to the screw rod, and the second groove portion is perpendicular to the screw rod, and a fourth wheel is correspondingly provided on the door body, and the fourth wheel is rotatably connected to the door body;

[0020] The fourth abutment wheel is adapted to abut against the first groove portion when the door body moves to the locked position.

[0021] Preferably, the inner wall of the first groove is provided with a buffer pad for contacting the fourth wheel.

[0022] Beneficial effects:

[0023] The present invention provides a locking, retaining, and unlocking structure in which a screw is driven by a drive motor or other drive element to rotate, causing a threaded sleeve to slide relative to a door frame, thereby enabling the door to open and close relative to the door frame. Specifically, a locking, retaining mechanism is provided, comprising a first swing arm swingably mounted on the door frame and a first elastic member disposed between the first swing arm and the door frame. When the threaded sleeve moves to a position corresponding to the door closing, a slot on the threaded sleeve and the first swing arm move to a position where they can engage. At this point, the first elastic member provides an elastic force, causing the first swing arm to swing toward the threaded sleeve and engage within the slot, thereby locking and retaining the threaded sleeve, i.e., the door, and preventing accidental disengagement of the screw and sleeve. The locking, retaining mechanism transmits the locking force from within the door to the door frame, preventing it from being transmitted between the screw and sleeve, thereby reducing friction between the two. When the door is unlocked, the drive motor drives the screw to rotate. The torque of the screw's rotation overcomes the elastic force applied by the first elastic member, thereby pushing the first swing arm out of the slot, releasing the engagement and achieving unlocking.

[0024] Furthermore, an unlocking mechanism is provided, comprising a second swing lever swingably mounted on the door frame and a pull member mounted on the second swing lever. When emergency unlocking is required, the pull member drives the second swing lever to swing, causing the abutting end of the second swing lever to push against the threaded sleeve. The second swing lever applies a thrust to the threaded sleeve in the direction of door opening, which in turn drives the screw rod to rotate, thereby moving the threaded sleeve a certain distance in the direction of door opening, thereby enabling the door to be opened urgently. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural diagram of the locking, holding and unlocking structure provided by the utility model;

[0026] Figure 2 This is a partial structural diagram of the locking, holding and unlocking structure provided by the present invention in a locked state from one perspective;

[0027] Figure 3 This is a partial structural diagram of the locking state of the locking, holding and unlocking structure provided by the present invention from another perspective;

[0028] Figure 4 This is a partial structural diagram of the locking, holding and unlocking structure provided by the present invention in the unlocked state from one perspective;

[0029] Figure 5 It is a partial structural diagram of the unlocked state of the locking, holding and unlocking structure provided by the present invention from another perspective.

[0030] In the picture:

[0031] 1. Locking and holding mechanism; 11. First swing arm; 12. First elastic member; 13. Support; 14. First hinge shaft; 15. First stop wheel; 16. Clamping member; 17. Third stop wheel;

[0032] 2. Unlocking mechanism; 21. Second rocker; 22. Pulling member; 23. Second elastic member; 24. Second hinge shaft; 25. Second stop wheel;

[0033] 3. Door frame; 31. Screw;

[0034] 41. Threaded sleeve; 42. Slot; 43. Locking frame; 44. L-shaped slot; 441. First slot; 442. Second slot; 45. Fourth stop wheel. DETAILED DESCRIPTION

[0035] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0036] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0037] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0038] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0039] The utility model provides a locking, holding and unlocking structure for a sliding plug door. Figures 1 to 5 As shown, the Sierra door includes a door frame 3 and a door body (not shown). A screw rod 31 is rotatably mounted on the door frame 3, and a threaded sleeve 41 is mounted on the door body. The threaded sleeve 41 slides along the axial direction of the screw rod 31 on the door frame 3. The threaded sleeve 41 is sleeved around the screw rod 31 and is threadedly connected to the screw rod 31. Specifically, the screw rod 31 and the threaded sleeve 41 together form a screw-nut structure. The screw rod 31 is driven by a drive motor or other driving member to rotate, causing the threaded sleeve 41 to slide relative to the door frame 3, thereby enabling the door body to open and close relative to the door frame 3.

[0040] In this embodiment, the lock, hold, and unlock structure includes a lock, hold mechanism 1 and an unlock mechanism 2. The lock, hold mechanism 1 includes a first swing arm 11 and a first elastic member 12. The first swing arm 11 is swingably mounted on the door frame 3. A threaded sleeve 41 defines a retaining slot 42. The first elastic member 12 is adapted to provide an elastic force to the first swing arm 11, causing the first swing arm 11 to swing and engage within the retaining slot 42 when the door body moves to the locked position. The unlock mechanism 2 includes a second swing arm 21 and a pulling member 22. The second swing arm 21 is swingably mounted on the door frame 3 and has a push-on end. The pulling member 22 is disposed on the second swing arm 21. The pulling member 22 is capable of driving the second swing arm 21 to swing, causing the push-on end of the second swing arm 21 to push against the threaded sleeve 41, thereby releasing the engagement between the first swing arm 11 and the retaining slot 42.

[0041] In this embodiment, a locking and holding mechanism 1 is provided, which includes a first rocker arm 11 swingably provided on the door frame 3 and a first elastic member 12 provided between the first rocker arm 11 and the door frame 3. When the threaded sleeve 41 moves to a position corresponding to the closing of the door body, the slot 42 on the threaded sleeve 41 moves to a position where it can engage with the first rocker arm 11. At this time, the first elastic member 12 provides elastic force, causing the first rocker arm 11 to swing toward the side of the threaded sleeve 41 and be stuck in the slot 42, thereby locking and holding the threaded sleeve 41, that is, the door body, and preventing the screw rod 31 and the threaded sleeve 41 from being accidentally unlocked. The locking and holding mechanism 1 can transmit the locking force inside and outside the door body to the door frame 3, avoiding transmission between the screw rod 31 and the threaded sleeve 41, and reducing the friction between the screw rod 31 and the threaded sleeve 41. For details, please refer to Figures 1 to 2 As shown, when the door is in a locked state, the first elastic member 12 provides elastic force so that the first swing rod 11 always tends to swing upward, so that the first swing rod 11 is stuck in the slot 42 .

[0042] When the door is unlocked, the driving motor drives the screw rod 31 to rotate, and the torque of the screw rod 31 overcomes the elastic force applied by the first elastic member 12, thereby pushing the first swing rod 11 out of the slot 42 to release the jam and achieve unlocking. Figures 4 and 5 As shown, when the door body needs to be unlocked, the screw rod 31 is driven to rotate by a driving motor or other driving parts, so that the threaded sleeve 41 moves relative to the left side in the figure. During the process, the torque of the rotation of the screw rod 31 overcomes the elastic force of the first elastic part 12 to push the first rocker arm 11 out of the slot 42, thereby releasing the jamming between the first rocker arm 11 and the slot 42.

[0043] In addition, an unlocking mechanism 2 is provided, which includes a second swing rod 21 swingably mounted on the door frame 3 and a pulling member 22 mounted on the second swing rod 21. When emergency unlocking is required, the pulling member 22 drives the second swing rod 21 to swing, causing the pushing end of the second swing rod 21 to push against the threaded sleeve 41. The second swing rod 21 provides a thrust to the threaded sleeve 41 in the direction of door opening, which drives the screw rod 31 to rotate and also moves the threaded sleeve 41 a certain distance in the direction of door opening, thereby enabling the door to be opened urgently. For details, please refer to Figures 4 and 5 As shown, when the door body needs to be unlocked urgently, the pulling member 22 drives the pushing end of the second rocker arm 21 to swing toward the left relative to the figure, thereby providing a leftward thrust to the threaded sleeve 41, pushing the threaded sleeve 41 to move a distance to the left, so that the door body is opened urgently.

[0044] In this embodiment, the pulling member 22 is configured as a pulling cable, one end of which is fixed to the second rocker arm 21 via a connecting structure such as a joint, and the other end of the pulling cable extends to the interior of the vehicle's cab for the driver to pull.

[0045] This embodiment is not limited to this. In addition to the pulling member 22, components such as a driving cylinder and a driving motor that can drive the second swing rod 21 to swing may also be provided, and no further limitations are given here.

[0046] Specifically, the lock-retention mechanism 1 includes a support 13 fixed to the door frame 3. The first and second swing arms 11 and 21 are both hingedly mounted on the support 13. Specifically, the support 13 provides a secure mounting base for the first and second swing arms 11 and 21. Optionally, the support 13 includes a mounting hole, through which an external screw passes to achieve a threaded connection with the door frame 3, thereby securing the support 13. Optionally, the mounting hole is configured as an elongated hole, allowing the mounting position of the support 13 to be adjusted to a certain extent.

[0047] Furthermore, the first rocker arm 11 is hinged to the support 13 via a first hinge shaft 14. The first elastic member 12 is sleeved on the first hinge shaft 14, with a first end of the first elastic member 12 connected to the first rocker arm 11 and a second end of the first elastic member 12 connected to the support 13. Specifically, the first elastic member 12 is configured as a torsion spring sleeved on the first hinge shaft 14, with its two ends respectively connected to the first rocker arm 11 and the support 13. The sleeved arrangement of the first elastic member 12 on the first hinge shaft 14 provides a secure mounting space for the first elastic member 12.

[0048] Furthermore, the unlocking mechanism 2 includes a second elastic member 23. The second rocker arm 21 is hinged to the support 13 via a second hinge shaft 24. The second elastic member 23 is mounted on the second hinge shaft 24. The first end of the second elastic member 23 is connected to the second rocker arm 21, and the second end of the second elastic member 23 is connected to the support 13. The second elastic member 23 is configured to provide a force that forces the push-end of the second rocker arm 21 to swing away from the threaded sleeve 41. The mounting of the second elastic member 23 on the second hinge shaft 24 provides a secure mounting space for the second elastic member 23. By providing the second elastic member 23, when emergency unlocking is not required, the second elastic member 23 provides an elastic force that causes the push-end of the second rocker arm 21 to always swing away from the threaded sleeve 41, thereby releasing the push-end of the second rocker arm 21 from contact with the threaded sleeve 41.

[0049] The second elastic member 23 is configured as a torsion spring, which is sleeved on the second hinge shaft 24 , and two ends of the torsion spring are respectively connected to the second swing rod 21 and the support 13 .

[0050] Furthermore, the pulling member 22 is provided at one end away from the pushing end of the second swing rod 21, and the hinge shaft is located between the pushing end of the second swing rod 21 and the pulling member 22. Figure 5 As shown, the second swing rod 21 is pulled rightward by the pulling member 22 , so that the pushing end of the second swing rod 21 swings leftward, and then the pushing end of the second swing rod 21 approaches and pushes against the threaded sleeve 41 .

[0051] In this embodiment, the first swing arm 11 is provided with a first wheel 15 capable of engaging with the slot 42. The first wheel 15 is rotatably connected to the first swing arm 11. By providing the first wheel 15, when the threaded sleeve 41 moves to a position corresponding to the closed door body, the slot 42 on the threaded sleeve 41 and the first wheel 15 move to a position where they can engage. At this time, the first elastic member 12 provides an elastic force, causing the first swing arm 11 to swing toward the threaded sleeve 41, thereby causing the first wheel 15 to engage with the slot 42, thereby locking the threaded sleeve 41, i.e., the door body. When in contact with the slot 42, the first wheel 15 can roll relative to the surface of the slot 42, thereby reducing contact friction and reducing surface wear on the first swing arm 11 and the slot 42.

[0052] In this embodiment, the second swing arm 21 has a second wheel 25 at its abutting end, capable of abutting against the threaded sleeve 41. The second wheel 25 is rotatably connected to the second swing arm 21. By providing the second wheel 25, the second swing arm 21 is driven to swing by the pull member 22, causing the second wheel 25, located at the abutting end of the second swing arm 21, to abut against the threaded sleeve 41. When in contact with the threaded sleeve 41, the second wheel 25 rolls relative to the surface of the threaded sleeve 41, thereby reducing contact friction and minimizing surface wear on the second swing arm 21 and the threaded sleeve 41.

[0053] Optionally, the first wheel 15 and the second wheel 25 may be made of vibration-damping rubber material to further reduce impact and vibration.

[0054] In this embodiment, the locking and holding mechanism 1 further comprises a pressing member 16, which is provided on the door frame 3 and has a third wheel 17 rotatably provided on the pressing member 16. The third wheel 17 is adapted to press against the threaded sleeve 41 when the door body moves to the locked position. Figures 2 to 3 As shown, when the threaded sleeve 41 moves to the position corresponding to the door body being closed, while the first friction wheel 15 is in contact with the slot 42, the third friction wheel 17 can provide an upward tightening force to the threaded sleeve 41, thereby further tightening the threaded sleeve 41. In conjunction with the first swing arm 11 and the first friction wheel 15, the threaded sleeve 41 can be reliably locked to prevent the threaded sleeve 41 from being released from the locked position. In addition, when the third friction wheel 17 is in contact with the threaded sleeve 41, it can roll relative to the surface of the threaded sleeve 41, thereby reducing contact friction and reducing surface wear on the threaded sleeve 41.

[0055] Optionally, the third wheel 17 may be made of vibration-damping rubber material to further reduce impact and vibration.

[0056] Optionally, the pressing member 16 is fixedly connected to the door frame 3 by external screws or other connecting members.

[0057] In this embodiment, a locking frame 43 is fixed to the threaded sleeve 41. The locking frame 43 defines an L-shaped slot 44, which includes a first slot 441 and a second slot 442. The first slot 441 is parallel to the screw rod 31, while the second slot 442 is perpendicular to the screw rod 31. A corresponding fourth wheel 45 is provided on the door body and is rotatably connected to the door body. The fourth wheel 45 is adapted to engage with the first slot 441 when the door body is moved to the locked position. Specifically, when the door body is in the open position, the fourth wheel 45 is located at the lower end of the second slot 442. When the door body moves from the open position to the closed position, the fourth wheel 45 gradually moves upward from the lower end of the second slot 442 and enters the first slot 441. When the door body moves to the closed position, that is, when the first wheel 15 engages with the slot 42, the fourth wheel 45 engages with the first slot 441, thereby locking the door body. When the fourth wheel 45 contacts the first groove portion 441 and the second groove portion 442 , it can roll relative to the inner walls of the first groove portion 441 and the second groove portion 442 , thereby reducing contact friction and lowering surface wear on the L-shaped groove 44 .

[0058] Optionally, the fourth wheel 45 may be made of vibration-damping rubber material to further reduce impact and vibration.

[0059] Furthermore, the inner wall of the first groove portion 441 is provided with a buffer pad (not shown) for contacting the fourth wheel 45. The buffer pad is in direct contact with the fourth wheel 45, which can further buffer and reduce vibration, thereby better protecting the hard part.

[0060] Optionally, the buffer pad is made of rubber.

[0061] In summary, the locking, holding and unlocking structure provided in this embodiment can reliably lock the door body when the Sierra door is closed, and can also urgently unlock the door body when the door body needs to be opened urgently.

[0062] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A locking, holding and unlocking structure for a plug-type sliding door, the plug-type sliding door comprising a door frame (3) and a door body, a screw rod (31) being rotatably provided on the door frame (3), the door body being provided with a threaded sleeve (41), the threaded sleeve (41) sliding on the door frame (3) along the axial direction of the screw rod (31), the threaded sleeve (41) being sleeved on the screw rod (31) and being threadedly connected to the screw rod (31), characterized in that: The locking, holding and unlocking structure includes: The locking and holding mechanism (1) comprises a first swing rod (11) and a first elastic member (12), wherein the first swing rod (11) is swingably arranged on the door frame (3), the threaded sleeve (41) is provided with a clamping groove (42), and the first elastic member (12) is suitable for providing elastic force to the first swing rod (11), so that the first swing rod (11) swings and is clamped in the clamping groove (42) when the door body moves to the locked position; The unlocking mechanism (2) comprises a second rocker (21) and a pulling member (22), wherein the second rocker (21) is swingably arranged on the door frame (3) and has a pushing end, and the pulling member (22) is arranged on the second rocker (21), and the pulling member (22) can drive the second rocker (21) to swing, so that the pushing end of the second rocker (21) pushes against the threaded sleeve (41) to release the engagement between the first rocker (11) and the slot (42).

2. The locking, holding and unlocking structure according to claim 1, wherein: The locking and holding mechanism (1) further comprises a pressing member (16), wherein the pressing member (16) is provided on the door frame (3), and a third stop wheel (17) is rotatably provided on the pressing member (16); The third abutting wheel (17) is adapted to abut tightly against the threaded sleeve (41) when the door body moves to a locked position.

3. The locking, holding and unlocking structure according to claim 1, wherein: The locking and holding mechanism (1) comprises a support (13), the support (13) is fixedly arranged on the door frame (3), and the first swing arm (11) and the second swing arm (21) are both hingedly arranged on the support (13).

4. The locking, holding and unlocking structure according to claim 3, characterized in that: The first rocker arm (11) is hinged to the support (13) via a first hinge shaft (14); the first elastic member (12) is sleeved on the first hinge shaft (14); a first end of the first elastic member (12) is connected to the first rocker arm (11); and a second end of the first elastic member (12) is connected to the support (13).

5. The locking, holding and unlocking structure according to claim 4, characterized in that: The unlocking mechanism (2) further comprises a second elastic member (23), the second rocker (21) is hinged to the support (13) via a second hinge shaft (24), the second elastic member (23) is sleeved on the second hinge shaft (24), a first end of the second elastic member (23) is connected to the second rocker (21), and a second end of the second elastic member (23) is connected to the support (13); The second elastic member (23) is configured to provide a force forcing the pushing end of the second swing rod (21) to swing away from the threaded sleeve (41).

6. The locking, holding and unlocking structure according to claim 5, characterized in that: The pulling member (22) is arranged at an end away from the pushing end of the second rocker (21), and the hinge shaft (24) is located between the pushing end of the second rocker (21) and the pulling member (22).

7. The locking, holding and unlocking structure according to claim 5, wherein: The first elastic member (12) and the second elastic member (23) are both configured as torsion springs.

8. The locking, holding and unlocking structure according to claim 1, wherein: The first swing arm (11) is provided with a first abutting wheel (15) capable of abutting against the clamping slot (42), and the first abutting wheel (15) is rotatably connected to the first swing arm (11); The pushing end of the second rocker (21) is provided with a second push wheel (25) capable of pushing and contacting the threaded sleeve (41), and the second push wheel (25) is rotatably connected to the second rocker (21).

9. The locking, holding and unlocking structure according to claim 1, wherein: A locking frame (43) is fixedly provided on the threaded sleeve (41), and an L-shaped groove (44) is provided on the locking frame (43). The L-shaped groove (44) includes a first groove portion (441) and a second groove portion (442) that are connected to each other. The first groove portion (441) is parallel to the screw rod (31), and the second groove portion (442) is perpendicular to the screw rod (31). A fourth wheel (45) is correspondingly provided on the door body, and the fourth wheel (45) is rotatably connected to the door body. The fourth abutting wheel (45) is adapted to abut against the first groove portion (441) when the door body moves to a locked position.

10. The locking, holding and unlocking structure according to claim 9, wherein: The inner wall of the first groove portion (441) is provided with a buffer pad for contacting the fourth contact wheel (45).

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