Automatic locking mechanism and transport frame

Abstract

The invention provides the automatic locking mechanism capable of simply and quickly locking / unlocking the door body and the transportation frame with the automatic locking mechanism. The automatic locking mechanism is used for automatically locking a door body and a door frame and comprises a locking pin, a sliding locking panel and a locking hook. Wherein the locking pin is fixed on the surface of the opening side of the door body, and at least part of the locking pin is arranged in a mode of extending out of the edge of the door body. The sliding locking panel and the end of the locking pin are correspondingly arranged on the surface of the door frame, and the sliding locking panel can slide up and down in the gravity direction. The locking hook is fixed to the surface of the sliding locking panel, the front end of the locking hook is bent in the gravity direction to form a hook-shaped part, and at the locking position of the automatic locking mechanism, the locking pin is located in an opening of the hook-shaped part.

Description

Technical Field

[0001] The invention relates to the field of logistics, and in particular to an automatic locking mechanism and a transport frame having the automatic locking mechanism. Background Art

[0002] In the field of logistics and transportation, a latch locking mechanism is often used. A movable latch is set on the edge of the door body and a corresponding socket is set on the door frame. When the door body is closed, the door body and the door frame need to be closed to the specified position, and the movable latch is aligned with the socket and inserted to complete the locking of the door body and the door frame. When the door body is opened, the movable latch needs to be pulled out of the socket to complete the unlocking of the door body and the door frame.

[0003] However, in actual use, since the movable latch needs to be inserted / withdrawn into the corresponding socket, and there is often a certain deviation in the closed position between the door body and the door frame, it is impossible to ensure that the latch and the socket are completely corresponding. As a result, the insertion / withdrawal process of the movable latch requires overcoming the friction between the latch and the socket, making the locking and unlocking of the door body more complicated and the work efficiency low. Summary of the invention

[0004] In view of the above problems, the present invention provides an automatic locking mechanism capable of simply and quickly locking / unlocking a door body and a transport frame having the automatic locking mechanism.

[0005] A first aspect of the present invention provides an automatic locking mechanism for automatic locking of a door body and a door frame, the automatic locking mechanism comprising: a locking pin, a sliding locking panel and a locking hook. The locking pin is fixed to the surface of the open side of the door body, and at least part of the locking pin is arranged in a manner of extending out of the edge of the door body. The sliding locking panel and the end of the locking pin are arranged on the surface of the door frame correspondingly, and the sliding locking panel can slide up and down along the direction of gravity. The locking hook is fixed to the surface of the sliding locking panel, and the front end of the locking hook is bent in the direction of gravity to form a hook-shaped portion. In the locked position of the automatic locking mechanism, the locking pin is located in the opening of the hook-shaped portion.

[0006] According to the technical solution of the present invention, when closing the door, it is only necessary to slide the sliding locking panel upwards so that the locking pin is lower than the hook-shaped portion, so that the locking pin can fall under the opening of the hook-shaped portion as the door body is closed. At this time, it is only necessary to stop applying force to the sliding locking panel, and the sliding locking panel will automatically fall under the action of gravity, and the locking pin will enter the opening, and the door body and the door frame will be locked by the deadweight of the sliding panel; when opening, it is only necessary to slide the sliding locking panel upwards to unlock the door body and the door frame. There is no need for alignment, and the operation is simple. Even if there is some deviation in the closing position between the door body and the door frame, the door body can be quickly and reliably locked / unlocked.

[0007] As a preferred technical solution of the present invention, the automatic locking mechanism also includes a fixing screw, the sliding locking panel is provided with a guide groove along the gravity direction, and the fixing screw passes through the guide groove and is fixed to the surface of the door frame.

[0008] According to this preferred technical solution, the sliding locking panel can be reliably fixed to the door frame surface through the cooperation of the guide groove and the fixing screw. At the same time, the fixing screw can move relatively along the guide groove, so that the sliding locking panel can slide up and down on the surface of the door frame along the direction of gravity.

[0009] As a preferred technical solution of the present invention, the front surface of the hook-shaped portion is formed as an inclined guide surface, which is formed in a manner that the height gradually decreases from front to back, and when the fixing screw is located at the upper end of the guide groove, the inclined guide surface is flush with the height of the locking pin.

[0010] According to the preferred technical solution, through the inclined guide surface, when the user closes the door body, the locking pin first abuts against the inclined guide surface, thereby applying an oblique upward force to the hook-shaped portion and the sliding locking panel fixed to the hook-shaped portion, so that the sliding locking panel slides upward until the lower edge of the hook-shaped portion is higher than the locking pin, and the locking pin enters the opening. At this time, the force applied by the locking pin disappears, and the sliding locking panel drives the hook-shaped portion to fall under the action of gravity, completing the locking of the door body and the door frame. The entire process only requires one action of closing the door inward to complete the locking of the door body and the door frame, and the operation is simpler and faster.

[0011] As a preferred technical solution of the present invention, a plurality of locking pins are formed, the plurality of locking pins are evenly arranged along the edge of the door body, and the plurality of locking hooks are correspondingly arranged with the plurality of locking pins.

[0012] According to this preferred technical solution, the uniform arrangement of multiple locking pins and multiple locking hooks can ensure the reliability of the locking structure of the door body and the door frame.

[0013] As a preferred technical solution of the present invention, two locking pins are formed, which are arranged at the upper and lower parts of the door body, and the locking hooks and the locking pins are correspondingly arranged at the upper and lower parts of the door frame.

[0014] According to the preferred technical solution, the upper and lower parts of the door body of the side-opening door are prone to shaking and affect the locking effect of the door body and the door frame. By arranging the matching structures of the two locking pins and the locking hooks at the upper and lower parts of the door body respectively, a more reliable locking effect can be achieved at a lower cost.

[0015] As a preferred technical solution of the present invention, the automatic locking mechanism also includes a safety lock, which is rotatably arranged on the surface of the sliding locking panel, and the fixing screw includes at least one safety screw. In the locking position of the automatic locking mechanism, the safety lock cooperates with the safety screw to limit the relative movement of the safety screw in the guide groove.

[0016] According to the preferred technical solution, for the existing active latch locking mechanism, if it is necessary to further add a safety locking structure, a mechanical lock is generally added to limit the movement of the active latch, which is cumbersome and costly, and there is also a risk of key loss. However, the present invention uses a self-contained rotatable safety lock, and there is no need to add other locks. The safety lock can be rotated to a position that matches the safety screw to complete the limit, which has a simple structure and is easy to operate.

[0017] As a preferred technical solution of the present invention, the safety lock includes a rotating shaft, a rigid rotating arm and a fixing buckle. The rotating shaft is perpendicular to the surface of the sliding locking panel, one end of the rigid rotating arm is connected to the rotating shaft, and the other end is fixedly connected to the fixing buckle, which rotates around the rotating shaft under the drive of the rigid rotating arm. In the locked position of the automatic locking mechanism, the length of the rigid rotating arm is equal to the length from the rotating shaft to the safety screw, and the fixing buckle is fixed to the lower side of the safety screw.

[0018] According to the preferred technical solution, the safety lock can be rotated to open / close through the cooperation of the rotating shaft and the rigid rotating arm, with a simple structure and quick operation. In addition, when the safety lock is rotated to the locked position, that is, in the locked position of the automatic locking mechanism, the fixed buckle is fixed to the lower side of the safety screw, and when the sliding panel slides up, the safety screw moves downward relative to the sliding locking panel in the guide groove. Since the length of the rigid rotating arm is equal to the length from the rotating shaft to the safety screw, and it does not have elastic expansion performance, the safety screw is limited in moving downward relative to the sliding locking panel in the guide groove, thereby realizing reliable fixation of the sliding locking panel with a simple structure, and preventing the sliding locking panel from sliding up and causing the locking pin to fall out and fail to lock.

[0019] As a preferred technical solution of the present invention, the rotating shaft is arranged above the safety screw.

[0020] According to this preferred technical solution, the rotating shaft is arranged above the safety screw, so that the rigid rotating arm naturally falls under the action of gravity so that the fixing buckle can abut and fix on the safety screw.

[0021] As a preferred technical solution of the present invention, the rigid rotating arm of the safety lock rotates to the side away from the door body to open, and, in the locked position of the automatic locking mechanism, the fixing buckle is formed by the end of the rigid rotating arm extending toward the door body.

[0022] According to this preferred technical solution, the rotation of the safety lock will not interfere with the opening and closing of the door body, and when the rigid rotating arm rotates from the side away from the door body to the downward direction, the fixing buckle can be directly clamped on the lower side of the safety screw.

[0023] A second aspect of the present invention provides a transport frame, comprising a door body and a door frame. In particular, the transport frame further comprises the automatic locking mechanism in any of the above technical solutions. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the automatic locking mechanism provided by an embodiment of the present invention.

[0025] Figure 2 It is a schematic structural diagram of a locking hook of an automatic locking mechanism provided in an embodiment of the present invention.

[0026] Reference numerals:

[0027] 100-door body; 200-door frame;

[0028] 1-locking pin; 2-locking hook; 21-hook-shaped portion; 22-opening; 23-inclined guide surface; 3-sliding locking panel; 31-guide groove; 4-fixing screw; 40-safety screw; 5-safety lock; 51-rotating shaft; 52-rigid rotating arm; 53-fixing buckle. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" 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 mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship 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.

[0031] In the present invention, "front" refers to the side of the door body or door frame facing the user, that is, the side of the door body or door frame of the transport frame facing outward; "rear" refers to the side of the door body or door frame facing away from the user, that is, the side of the door body or door frame of the transport frame facing inward. "Up" and "down" refer to the up and down settings based on the direction of gravity, but do not directly limit the two features to be directly set in an up-down cumulative manner. The first feature "up" or "down" of the second feature may include the first and second features directly contacting, or may include the first and second features not directly contacting but contacting through another feature between them. Moreover, the first feature "above", "above" and "above" the second feature include the first feature directly above and obliquely above the second feature, or simply indicate that the first feature is higher in level than the second feature. The first feature "below", "below" and "below" the second feature include the first feature directly below and obliquely below the second feature, or simply indicate that the first feature is lower in level than the second feature.

[0032] First embodiment

[0033] Figure 1 Schematic diagram of the structure of an automatic locking mechanism provided by an embodiment of the present invention. Figure 1 As shown, the first embodiment of the present invention provides an automatic locking mechanism, which is used for automatic locking of a door body 100 and a door frame 200. Figure 1 The example in which the automatic locking mechanism is used for automatic locking of the door body 100 and the door frame 200 of the side-opening door of the logistics transport frame is shown, but the present invention is not limited to this. The automatic locking mechanism provided in this embodiment can be used for automatic locking of the door body 100 and the door frame 200 of household appliances, logistics transport frames or other devices. Similarly, the automatic locking mechanism provided in this embodiment is also applicable to the door body 100 and the door frame 200 of the upper opening door and the lower opening door.

[0034] The automatic locking mechanism provided in this embodiment includes a locking pin 1 fixed on the surface of the door body 100, and a sliding locking panel 3 and a locking hook 2 correspondingly arranged on the surface of the door frame 200. The locking of the door body 100 and the door frame 200 is achieved by the coordinated engagement of the locking pin 1 and the locking hook 2, and the locking hook 2 is driven to move up and down by the sliding locking panel 3 sliding up and down, so as to conveniently perform locking / unlocking operations on the engagement structure of the locking pin 1 and the locking hook 2.

[0035] Specifically, when closing the door, you only need to slide the sliding locking panel 3 up, and the locking pin 1 can fall under the locking hook 2 as the door body 100 closes. At this time, you only need to stop applying force to the sliding locking panel 3, and the sliding locking panel 3 will automatically fall down under the action of gravity. The locking pin 1 and the locking hook 2 are clamped and fixed, and the door body 100 and the door frame 200 are locked by the weight of the sliding panel. When opening the door, you only need to slide up the sliding locking panel 3 to unlock the door body 100 and the door frame 200. There is no need to align, and the locking can be completed by the natural fall of the sliding locking panel 3 due to gravity. The operation is convenient and labor-saving.

[0036] It should be noted that the number of the locking pins 1 and the locking hooks 2 is not limited here, and can be one, two or more (more than two). For example, when there are multiple locking pins 1, the multiple locking pins 1 can be evenly arranged along the edge of the door body 100, and the multiple locking hooks 2 are arranged corresponding to the multiple locking pins 1. The uniform arrangement of the multiple locking pins 1 and the multiple locking hooks 2 can ensure the reliability of the locking structure of the door body 100 and the door frame 200. In another example, there can also be two locking pins 1, which are arranged at the upper and lower parts of the door body 100, and correspondingly, the locking hooks 2 and the locking pins 1 are arranged in pairs at the upper and lower parts of the door frame 200. The upper and lower parts of the door body 100 of the side-opening door are easy to shake and affect the locking effect of the door body 100 and the door frame 200, and the matching structures of the two locking pins 1 and the locking hooks 2 are respectively arranged at the upper and lower parts of the door body 100, which can achieve a more reliable locking effect at a lower cost.

[0037] The structure of the automatic locking mechanism provided by the embodiment of the present invention is described in detail below with reference to the accompanying drawings.

[0038] [Locking pin 1]

[0039] The locking pin 1 includes one end fixed to the surface of the door body 100 on the open side. The locking pin 1 and the door body 100 can be fixed in any manner, such as by screws, welding, etc., which are not limited here. The other end of the locking pin 1 extends out of the edge of the door body 100 as a pin body (not shown in the figure). The pin body is used to engage with the opening 22 of the locking hook 2, so the shape can be freely selected according to the engaging structure. Here, a long strip pin body is taken as an example.

[0040] for Figure 1In the door body 100 of a side-opening door shown in the figure, the locking pin 1 can be set on the front surface of the door body 100 close to the side, and the pin body can extend toward the door frame 200 on the side. It can be understood by those skilled in the art that, for other door opening situations, the locking pin 1 can also be set on other surfaces of the door body 100 close to the opening side. For example, for the door body 100 and door frame 200 of an upward-opening door, the locking pin 1 can be fixed on the front surface of the door body 100 close to the upper edge, and the pin body can be extended toward the door frame 200 on the side; for the door body 100 and door frame 200 of a downward-opening door, the locking pin 1 can also be fixed on the front surface of the door body 100 close to the lower edge, and the pin body can be extended toward the door frame 200 on the side. All of the above belong to the protection scope of the present invention.

[0041] [Slide lock panel 3]

[0042] The sliding locking panel 3 is arranged on the surface of the door frame 200 corresponding to the pin body of the locking pin 1, for example, Figure 1 In the embodiment, the sliding locking panel 3 is arranged on the front surface of the side of the door frame 200. The sliding locking panel 3 can slide up and down along the direction of gravity, wherein the sliding locking panel 3 and the surface of the door frame 200 are slidably connected in any manner. For example, the sliding locking panel 3 can be slidably connected to the surface of the door frame 200 through a slide rail extending along the direction of gravity, or the sliding locking panel 3 can also be slidably connected to the door frame 200 by providing a guide groove extending along the direction of gravity and a corresponding protrusion limited in the guide groove.

[0043] Combination Figure 1 A preferred sliding connection structure between the sliding locking panel 3 and the surface of the door frame 200 is further described. Figure 1 As shown, one or more guide slots 31 along the direction of gravity can be provided on the sliding locking panel 3, and the fixing screws 4 can be passed through the guide slots 31 and fixed to the surface of the door frame 200. If necessary, one or more gaskets can be provided on the fixing screws 4 to prevent the fixing screws 4 from slipping out of the guide slots 31, so as to ensure that the sliding locking panel 3 is effectively limited by the fixing screws 4. In the above manner, the fixing screws 4 can move relatively along the guide slots, that is, the sliding locking panel 3 can slide up and down along the direction of gravity on the surface of the door frame 200.

[0044] [Locking hook 2]

[0045] Figure 2 2 is a schematic diagram of the structure of the locking hook 2 provided in an embodiment of the present invention. Figure 1 and Figure 2In general, the locking hook 2 is fixed to the surface of the sliding locking panel 3, and the locking hook 2 is arranged in pairs with the locking pin 1. The front end of the locking hook 2 (i.e., the end facing the user) is bent in the direction of gravity to form a hook-shaped portion 21, that is, the opening 22 of the hook-shaped portion 21 faces downward. Therefore, when the pin body of the locking pin 1 is in the opening 22 of the hook-shaped portion 21, the door body 100 and the door frame 200 can be automatically locked.

[0046] Preferably, the front surface (the side surface facing the user) of the hook-shaped portion 21 may be formed with an inclined guide surface 23, and the inclined guide surface 23 is formed in a manner of gradually decreasing in height from front to back, that is, Figure 2 As shown, the lower portion of the front surface of the hook-shaped portion 21 gradually decreases in height from the left side to the right side in the figure, thereby forming an inclined guide surface 23.

[0047] When the fixing screw 4 is located at the upper end of the guide slot 31, that is, when the sliding locking panel 3 maintains the lowest position of natural falling, the inclined guide surface 23 is flush with the height of the locking pin 1. Therefore, when the user closes the door body 100, the locking pin 1 will first abut against the inclined guide surface 23, thereby applying an oblique upward force to the hook-shaped portion 21 and the sliding locking panel 3 fixed to the hook-shaped portion 21, so that the sliding locking panel 3 slides upward until the lower edge of the hook-shaped portion 21 is higher than the locking pin 1, and the locking pin 1 enters the opening 22. At this time, since the force applied by the locking pin 1 disappears, the sliding locking panel 3 drives the hook-shaped portion 21 to fall under the action of gravity, completing the locking of the door body 100 and the door frame 200. The whole process only requires one action of closing the door inward to complete the locking of the door body 100 and the door frame 200, and the operation is simpler and faster.

[0048] In this embodiment, an automatic locking mechanism is provided which does not require alignment and has simple opening and closing operations. When closing the door, the door body 100 only needs to be pushed closed to push the pin body of the locking pin 1 into the opening 22 of the locking hook 2, and the door body 100 and the door frame 200 can be locked by the deadweight of the sliding panel; when opening the door, the door body 100 and the door frame 200 can be unlocked by sliding the sliding locking panel 3 upward. Even if there is some deviation in the closing position between the door body 100 and the door frame 200, the door body 100 can be locked / unlocked quickly and reliably. The automatic locking mechanism makes the locking / unlocking operation between the door body 100 and the door frame 200 simpler and faster.

[0049] Second embodiment

[0050] The second embodiment of the present invention provides an automatic locking mechanism with a safety lock 5. Other features not mentioned or described are the same as those of the first embodiment and will not be described in detail herein.

[0051] like Figure 1As shown, the automatic locking mechanism also includes a safety lock 5, one of the fixing screws 4 is used as a safety screw 40, and the safety lock 5 is rotatably arranged on the surface of the sliding locking panel 3, so that in the locked position of the automatic locking mechanism, the safety lock 5 is rotated to a position that cooperates with the safety screw 40 to limit the relative movement of the safety screw 40 in the guide groove, that is, the up and down movement of the sliding locking panel 3 relative to the door frame 200 is limited, thereby preventing the sliding locking panel 3 from moving up due to shaking and other factors, causing the locking pin 1 to disengage from the locking hook 2, thereby ensuring the reliability of the locking structure between the door body 100 and the door frame 200.

[0052] The specific structure of the safety lock 5 is not limited here. Preferably, the safety lock 5 may include a rotating shaft 51, a rigid rotating arm 52, and a fixing buckle 53. The rotating shaft 51 is perpendicular to the surface of the sliding locking panel 3. One end of the rigid rotating arm 52 is connected to the rotating shaft 51, and the other end is fixedly connected to the fixing buckle 53. The fixing buckle 53 rotates around the rotating shaft 51 under the drive of the rigid rotating arm 52. Thus, the fixing buckle 53 can be rotated to a position that matches the safety screw 40 through the rotation of the rigid rotating arm 52, and the fixing buckle 53 can also be rotated away from the position that matches the safety screw 40. The structure is simple and the operation is quick.

[0053] The fixing buckle 53 can be any structure that can be engaged with the safety screw 40 for position limiting. For example, for the protruding structure of the safety screw 40, the fixing buckle 53 can be formed into an annular buckle with a notch on one side, and the safety screw 40 just passes through the notch and enters the annular buckle through the notch by rotating the rigid rotating arm 52, so as to fix the sliding locking panel 3. Alternatively, in other embodiments, the fixing buckle 53 can also be formed into a bent hook-shaped structure, the notch of the hook-shaped structure is larger, and the structure is simpler, all of which also belong to the protection scope of the present invention.

[0054] Specifically, when the safety lock 5 is rotated to the locked position, that is, in the locked position of the automatic locking mechanism, the fixing buckle 53 is fixed to the lower side of the safety screw 40, and the length of the rigid rotating arm 52 is equal to the length from the rotating shaft 51 to the safety screw 40. Since the safety screw 40 moves downward relative to the sliding locking panel 3 in the guide slot 31 when the sliding panel slides up, and the length of the rigid rotating arm 52 is equal to the length from the rotating shaft 51 to the safety screw 40, and does not have elastic expansion performance, the safety screw 40 is limited in moving downward relative to the sliding locking panel 3 in the guide slot 31, thereby realizing reliable fixation of the sliding locking panel 3 with a simple structure, and preventing the sliding locking panel 3 from sliding up and causing the locking pin 1 to slip out and fail to lock.

[0055] In this embodiment, the rotating shaft 51 is not limited to being arranged above or below the safety screw 40. Figure 1, a preferred situation is shown by way of example, in which the rotating shaft 51 is disposed above the safety screw 40 , so that the rigid rotating arm 52 naturally falls under the action of gravity, so that the fixing buckle 53 can be abutted and fixed to the safety screw 40 .

[0056] Furthermore, in the case where the rotating shaft 51 is arranged above the safety screw 40, the rigid rotating arm 52 of the safety lock 5 can also be rotated to the side away from the door body 100 to open, and in the locked position of the automatic locking mechanism, the fixing buckle 53 is formed by the end of the rigid rotating arm 52 extending toward the door body 100. Therefore, the rotation of the safety lock 5 will not interfere with the opening and closing of the door body 100, and when the rigid rotating arm 52 rotates from the side away from the door body 100 to face downward, the fixing buckle 53 can be directly engaged with the lower side of the safety screw 40.

[0057] For the existing active latch locking mechanism, if it is necessary to further add a safety lock 5 structure, a mechanical lock is generally added to limit the movement of the active latch, which is complicated and costly, and there is also a risk of key loss. In this embodiment, a rotatable safety lock 5 is provided on the automatic locking mechanism, and no other locks are required. The safety lock 5 can be rotated to a position that matches the safety screw 40 to complete the limit, which has a simple structure and is easy to operate.

[0058] In other embodiments of the present invention, a transport frame is further provided, including a door body 100 and a door frame 200. In particular, the transport frame further includes the automatic locking mechanism in any of the above embodiments.

[0059] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An automatic locking mechanism for automatically locking a door body and a door frame, characterized in that: include: A locking pin is fixed to a surface of the door body close to the opening side, and at least a portion of the locking pin is arranged in a manner of extending beyond an edge of the door body; A sliding locking panel is arranged on the surface of the door frame corresponding to the end of the locking pin, and the sliding locking panel can slide up and down along the direction of gravity; A locking hook is fixed to the surface of the sliding locking panel, and the front end of the locking hook is bent in the direction of gravity to form a hook-shaped portion. In the locked position of the automatic locking mechanism, the locking pin is located in the opening of the hook portion.

2. The automatic locking mechanism according to claim 1, characterized in that: Also includes: The fixing screw is provided with a guide groove along the gravity direction on the sliding locking panel, and the fixing screw passes through the guide groove and is fixed to the surface of the door frame.

3. The automatic locking mechanism according to claim 2, characterized in that: The front surface of the hook-shaped portion is formed as an inclined guide surface, which is formed in a manner of gradually decreasing height from front to back, and when the fixing screw is located at the upper end of the guide slot, the inclined guide surface is flush with the height of the locking pin.

4. The automatic locking mechanism according to any one of claims 1 to 3, characterized in that: The locking pins are formed in plurality, and the locking pins are evenly arranged along the edge of the door body, and the locking hooks are arranged correspondingly to the locking pins.

5. The automatic locking mechanism according to any one of claims 1 to 3, characterized in that: The locking pins are formed in two and are arranged at the upper and lower parts of the door body respectively. The locking hooks and the locking pins are arranged at the upper and lower parts of the door frame correspondingly.

6. The automatic locking mechanism according to claim 2, characterized in that: Also includes: A safety lock is rotatably arranged on the surface of the sliding locking panel, and the fixing screw includes at least one safety screw. In the locked position of the automatic locking mechanism, the safety lock cooperates with the safety screw to limit the relative movement of the safety screw in the guide groove.

7. The automatic locking mechanism according to claim 6, characterized in that: The safety lock comprises: a rotation axis, perpendicular to the surface of the sliding locking panel; a rigid rotating arm, one end of which is connected to the rotating shaft; A fixing buckle is fixed to the other end of the rigid rotating arm and rotates around the rotating axis driven by the rigid rotating arm. In the locked position of the automatic locking mechanism, the length of the rigid rotating arm is equal to the length from the rotating shaft to the safety screw, and the fixing buckle is abutted and fixed on the lower side of the safety screw.

8. The automatic locking mechanism according to claim 7, characterized in that: The rotating shaft is arranged above the safety screw.

9. The automatic locking mechanism according to claim 8, characterized in that: The rigid rotating arm of the safety lock rotates to open toward a side away from the door body, and in the locked position of the automatic locking mechanism, the fixing buckle is formed by extending the end of the rigid rotating arm toward the door body.

10. A transport frame, comprising a door body and a door frame, characterized in that: It also includes an automatic locking mechanism as described in any one of claims 1-9.

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