Automatic locking device and packaging box using the same

Abstract

The present invention relates to an automatic locking device and a packaging box using the same. The automatic locking device includes an upper cover plate and a lower base plate. A locking assembly is provided in a cavity between the upper cover plate and the lower base plate. The locking assembly includes an unlocking rod, an active rack rod, a driven gear, a connecting rack rod, a rotating lock hook rod, a trigger slide, a trigger block, a lock tongue rod, a first locking spring and / or a second locking spring, and a trigger spring. An active lock tongue and an unlocking push button are provided on the unlocking rod, a driven lock tongue is provided on the lock tongue rod, and lock hooks are provided on the rotating lock hook rod. A lock hook side hole is provided on the front side of the lower base plate, and the lock hook extends from the lock hook side hole to the outside of the lower base plate. A brake block is provided at the rear of the trigger slide, and a positioning groove that cooperates with the brake block is provided on the connecting rack rod. The automatic locking device of the present invention is provided at the box opening of the packaging box body, so that the packaging box has the function of automatic sealing and can be used on a fully automatic packaging production line.

Description

Technical Field

[0001] The present invention belongs to the technical field of lock connection, and in particular relates to an automatic lock device and a packaging box using the same. Background Art

[0002] Most existing packaging boxes are made of cardboard, which are sealed with tape and cannot be recycled. Although some packaging boxes can be recycled and have a locking device at the box opening, this locking device cannot achieve automatic sealing and cannot be used in fully automatic packaging production lines. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an automatic locking device and a packaging box using the device. The automatic locking device is arranged at the box opening of the packaging box body, has the function of automatic sealing, can be used on a fully automatic packaging production line, and the packaging box can be recycled to reduce costs.

[0004] The present invention is implemented in this way, providing an automatic locking device, including an upper cover plate and a lower base plate connected together, a cavity is set between the upper cover plate and the lower base plate, and a lock assembly is set in the cavity, the lock assembly includes an unlocking rod, an active rack rod, a driven gear, a connecting rack rod, a rotating lock hook rod, a trigger slide rod, a trigger block, a lock tongue rod, a first locking spring and / or a second locking spring, and a trigger spring, an active lock tongue and an unlocking push button are respectively set on the unlocking rod, and the trigger block is convexly arranged on the front side of the lower base plate, between the unlocking rod and the active rack rod, and between the connecting rack rod and the lock tongue The rods are movably connected, an active rack is provided on the active rack rod, a first rack, a second rack, a first slide groove and a second slide groove are provided on the connecting rack rod, a driven lock tongue is provided on the lock tongue rod, and the active lock tongue and the driven lock tongue are respectively provided on the left and right sides close to the lower base plate; the driven gear is simultaneously engaged with the active rack and the first rack, a first rotating shaft is provided on the driven gear, the lower end of the first rotating shaft is located in the first through hole provided on the lower base plate, and the upper end thereof is located in the first slide groove, a lock hook, a second rotating shaft and a lock hook gear are respectively provided on the rotating lock hook rod, and the lock hook gear is engaged with the second gear The bars are meshed with each other, the lower end of the second rotating shaft is located in the second through hole set in the lower base plate, and the upper end thereof is located in the second sliding groove. A lock hook side hole is provided on the front side of the lower base plate, and the lock hook extends from the lock hook side hole to the outside of the lower base plate. A brake block is provided at the rear of the trigger slide rod, and a positioning groove that cooperates with the brake block is provided on the connecting rack rod. A trigger part is provided at the front end of the trigger slide rod, and the trigger part is located on the outside of the front side of the lower base plate; when the lock assembly is in a locked state, the trigger slide rod is in a constraint release position, the brake block is moved out of the positioning groove, the connecting rack rod can be moved left and right, and the active lock tongue and the driven lock tongue are locked. When the latch is in the unlocked position, the trigger slide is in the restricted position, the brake block is in the positioning groove, the connecting rack rod cannot be moved left and right, the active latch, the driven latch and the rotary lock hook rod are in the unlocked position, and the active latch, the driven latch and the lock hook are respectively retracted into the cavity.

[0005] Furthermore, a side hole for installing an unlocking button is provided on the upper cover plate, and the height of the unlocking button is lower than the top surface of the upper cover plate.

[0006] Furthermore, an anti-theft plug-in is provided in the side hole of the upper cover, and the anti-theft plug-in includes a plug-in board, a connecting part and an elastic snap buckle. The connecting part is a breakable part and is located between the plug-in board and the elastic snap buckle. A slot is provided on the unlocking button, and a locking edge is provided on the side of the slot. After the elastic snap buckle passes through the slot, it is locked with the locking edge. The plug-in board covers the unlocking button to prevent the unlocking button from being accidentally touched and causing an unlocking action.

[0007] Furthermore, a spring positioning block is provided on the lock tongue rod, the second locking spring is installed between the spring positioning block and the driven lock tongue, a limiting groove is provided on the spring positioning block, and a limiting protrusion cooperating with the limiting groove is provided on the lower base plate.

[0008] Furthermore, other locking components are provided on the front sides of the upper cover plate and the lower base plate, and another automatic locking device is provided on the other locking components. The trigger block of the other automatic locking device can interfere with the trigger slide bar of the locking assembly, so that the trigger slide bar of the locking assembly is in the constraint release position. At the same time, the trigger slide bar of the other automatic locking device interferes with the trigger block of the locking assembly, so that the trigger slide bar of the other automatic locking device is in the constraint release position.

[0009] Furthermore, a third rotating shaft is provided on the unlocking rod, a third through hole movably engaged with the third rotating shaft is provided on the active rack rod, a fourth rotating shaft is provided on the lock tongue rod, and a fourth through hole movably engaged with the fourth rotating shaft is provided on the connecting rack rod.

[0010] Furthermore, the trigger part includes a trigger fixing seat, a trigger shaft and a trigger roller, the trigger roller is movably sleeved on the trigger shaft, the left and right ends of the trigger shaft are respectively arranged on the trigger fixing seat, and the trigger roller extends to the outside of the front side of the trigger fixing seat.

[0011] The present invention is achieved by providing a packaging box on which the automatic locking device as described above is used.

[0012] Furthermore, the packaging box is a flat box, comprising a box body and a box cover arranged on the top surface or both the top and bottom surfaces of the box body, and the automatic locking device is arranged on the box cover.

[0013] Furthermore, the box cover includes a top front box cover and a top rear box cover located on the top surface of the box body and opened front to back, and a bottom front box cover and a bottom rear box cover located on the bottom surface of the box body and opened front to back, and the automatic locking device is respectively arranged on the top front box cover, the top rear box cover, the bottom front box cover and the bottom rear box cover.

[0014] Compared to the prior art, the automatic locking device of the present invention and the packaging box using the same comprise an upper cover plate and a lower base plate connected together, a locking assembly disposed in a cavity between the upper cover plate and the lower base plate, the locking assembly comprising an unlocking lever, an active rack rod, a driven gear, a connecting rack rod, a rotary lock hook rod, a trigger slide, a trigger block, a lock tongue rod, a first locking spring and / or a second locking spring, and a trigger spring. An active lock tongue and an unlocking push button are disposed on the unlocking lever, a driven lock tongue is disposed on the lock tongue rod, and lock hooks are disposed on the rotary lock hook rod. A lock hook side hole is disposed on the front side of the lower base plate, and the lock hook extends from the lock hook side hole to the outside of the lower base plate. A brake block is disposed at the rear of the trigger slide, and a positioning groove for cooperating with the brake block is disposed on the connecting rack rod. When the lock assembly is in the locked state, the trigger slide is in the constraint release position, the brake block is removed from the positioning groove, the connecting rack rod can be moved left and right, the active lock tongue, the driven lock tongue and the rotating lock hook rod are respectively in the locked position, the active lock tongue and the driven lock tongue respectively extend from the cavity and are located on the outer side of the lower base plate, and are respectively locked with the sockets on the other locking components that cooperate with them, and the lock hook is rotated out of the cavity from the lock hook side hole and is locked with the lock hole on the other locking components that cooperate with them. When the lock assembly is in the unlocked state, the trigger slide is in the constraint position, the brake block is located in the positioning groove, the connecting rack rod cannot be moved left and right, the active lock tongue, the driven lock tongue and the rotating lock hook rod are respectively in the unlocked position, and the active lock tongue, the driven lock tongue and the lock hook are respectively retracted to be located in the cavity. The automatic lock device of the present invention is arranged at the box opening of the packaging box body, has the function of automatic box sealing, can be used on a fully automatic packaging production line, and the packaging box can be recycled to reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A three-dimensional schematic diagram of a preferred embodiment of the automatic locking device of the present invention;

[0016] Figure 2 for Figure 1 A three-dimensional diagram after removing the upper cover, showing the locking assembly in a locked state;

[0017] Figure 3 for Figure 2 A three-dimensional diagram after removing the lower base plate, showing the locking assembly in a locked state;

[0018] Figure 4 for Figure 3 A three-dimensional schematic diagram from another angle and state, with the lock assembly in the unlocked state;

[0019] Figure 5 for Figure 4 A three-dimensional schematic diagram of the connecting rack rod in FIG;

[0020] Figure 6 for Figure 3 A three-dimensional schematic diagram of the anti-theft plug-in;

[0021] Figure 7 is a three-dimensional schematic diagram of a packaging box of the present invention;

[0022] Figure 8 for Figure 7 A three-dimensional schematic diagram of the upper cover of one side of the middle packaging box in the open state;

[0023] Figure 9 for Figure 7 A three-dimensional schematic diagram of a packaging box with the upper cover of the automatic locking device on one side removed;

[0024] Figure 10 for Figure 7 A three-dimensional schematic diagram of the packaging box with the box body and box cover removed. DETAILED DESCRIPTION

[0025] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0026] Please also refer to Figures 1 to 5 As shown, a preferred embodiment of the automatic locking device of the present invention includes an upper cover plate 1 and a lower base plate 2 connected together, a cavity 3 is provided between the upper cover plate 1 and the lower base plate 2, and a locking assembly 4 is disposed within the cavity 3. The upper cover plate 1 and the lower base plate 2 are fixed together by a plurality of bolts (not shown).

[0027] The lock assembly 4 includes an unlocking lever 41, an active rack rod 42, a driven gear 43, a connecting rack rod 44, a rotating lock hook rod 45, a trigger slide 46, a trigger block 47, a lock tongue rod 48, a first locking spring 49 and / or a second locking spring 410, and a trigger spring 411. An active lock tongue 412 and an unlocking button 413 are provided on the unlocking lever 41. The first locking spring 49 is provided on the right side of the unlocking button 413, the trigger spring 411 is provided on the rear side of the trigger slide 46, and the trigger block 47 is provided on the front side of the lower base plate 2. The unlocking lever 41 and the active rack rod 42, as well as the connecting rack rod 44 and the lock tongue rod 48, are movably connected. An active rack 414 is provided on the active rack rod 42, a first rack 415, a second rack 416, a first slide groove 417 and a second slide groove 418 are provided on the connecting rack rod 44, a driven lock tongue 419 is provided on the lock tongue rod 48, a second locking spring 410 is provided on the left side of the driven lock tongue 419, and the active lock tongue 412 and the driven lock tongue 419 are respectively provided on the left and right sides close to the lower base plate 2.

[0028] The driven gear 43 is meshed with the driving rack 414 and the first rack 415. A first rotating shaft 420 is disposed on the driven gear 43. The lower end of the first rotating shaft 420 is located in a first through-hole (not shown) provided in the lower base plate 2, and the upper end thereof is located in the first sliding groove 417. A locking hook 421, a second rotating shaft 422, and a locking hook gear 423 are disposed on the rotating locking hook rod 45. The locking hook gear 423 is meshed with the second rack 416. The lower end of the second rotating shaft 422 is located in a second through-hole (not shown) provided in the lower base plate 2, and the upper end thereof is located in the second sliding groove 418. A lock hook side hole 21 is provided on the front side surface of the lower base plate 2, and the lock hook 421 extends from the lock hook side hole 21 to the outside of the lower base plate 2. A brake block 424 is provided at the rear of the trigger slide rod 46, and a positioning groove 425 cooperating with the brake block 424 is provided on the connecting rack rod 44. A trigger portion 426 is provided at the front end of the trigger slide rod 46, and the trigger portion 426 is located outside the front side surface of the lower base plate 2.

[0029] When the lock assembly 4 is in the locked state, the trigger slide bar 46 is in the constraint release position, the brake block 424 is moved out of the positioning groove 425, the connecting rack rod 44 can be moved left and right, the active lock tongue 412, the driven lock tongue 419 and the rotating lock hook rod 45 are respectively in the locked position, the active lock tongue 412 and the driven lock tongue 419 respectively extend from the cavity 3 and are located on the outer edge of the lower base plate 2, and are respectively locked with the sockets on other locking components that cooperate with them (not shown in the figure), and the lock hook 421 is rotated out of the cavity 3 from the lock hook side hole 21 and locked with the lock holes on other locking components that cooperate with them (not shown in the figure).

[0030] When the lock assembly 4 is in the unlocked state, the trigger slide 46 is in the restricted position, the brake block 424 is located in the positioning groove 425, the connecting rack rod 44 cannot be moved left and right, the active lock tongue 412, the driven lock tongue 419 and the rotating lock hook rod 45 are respectively in the unlocked position, and the active lock tongue 412, the driven lock tongue 419 and the lock hook 421 are respectively located in the cavity 3.

[0031] Specifically, when the trigger portion 426 is squeezed to force the trigger slide 46 to move backward, the trigger spring 411 is compressed, the brake block 424 moves out of the positioning slot 425, and the constraint on the connecting rack rod 44 is released, and the trigger slide 46 is in the constraint-released position. At this time, under the action of the first locking spring 49, the unlocking rod 41 and the active lock tongue 412 move leftward, and the active lock tongue 412 moves leftward to the locked position; under the action of the second locking spring 410, the lock tongue rod 48 and the connecting rack rod 44 move rightward simultaneously, and the driven lock tongue 419 moves rightward to the locked position; the second rack 416 drives the rotating lock hook rod 45 to rotate counterclockwise to the locked position, and the first rotating shaft 420 and the second rotating shaft 422 are respectively located to the right of the first sliding slot 417 and the second sliding slot 418.

[0032] Specifically, when the unlocking rod 41 is pushed to move to the right, the active lock tongue 412 moves to the right into the cavity 3 and is in the unlocked position, the first locking spring 49 is compressed, and the driven gear 43 is driven to rotate counterclockwise through the active rack rod 42, driving the connecting rack rod 44 to move to the left, and the rotating lock hook rod 45 rotates clockwise into the cavity and is also in the unlocked position. At the same time, the lock tongue rod 48 moves to the left, and the driven lock tongue 419 moves to the left into the cavity and is also in the unlocked position, and the second locking spring 410 is compressed; when the positioning groove 425 on the connecting rack rod 44 moves to the position of the brake block 424, under the action of the trigger spring 411, the brake block 424 moves forward into the positioning groove 425, and the trigger slide bar 46 is in the restricted position. The first rotating shaft 420 and the second rotating shaft 422 are respectively located on the left side of the first slide groove 417 and the second slide groove 418.

[0033] Therefore, the locking assembly 4 has a linkage feature and also has a trigger feature.

[0034] An upper cover side hole 11 for installing an unlocking push button 413 is provided on the upper cover plate 1 , and the height of the unlocking push button 413 is lower than the top surface of the upper cover plate 1 .

[0035] Please also refer to Figure 1 、 Figure 3 and Figure 6 As shown, an anti-theft plug-in 5 is also installed in the upper cover side hole 11. The anti-theft plug-in 5 includes an insert board 51, a connecting portion 52, and an elastic snap 53. The connecting portion 52 is a breakable component and is located between the insert board 51 and the elastic snap 53. A slot 427 is provided on the unlock button 413, and a locking edge (not shown) is provided on the side of the slot 427. The elastic snap 53 passes through the slot 427 and interlocks with the locking edge. The insert board 51 covers the unlock button 413 to prevent the unlock button 413 from being accidentally touched and unlocking.

[0036] A spring positioning block 428 is provided on the lock tongue rod 48 , the second locking spring 410 is installed between the spring positioning block 428 and the driven lock tongue 419 , a limiting groove 429 is provided on the spring positioning block 428 , and a limiting protrusion 22 cooperating with the limiting groove 429 is provided on the lower base plate 2 .

[0037] Other locking components are also provided on the front sides of the upper cover plate 1 and the lower base plate 2, and another automatic locking device is provided on the other locking components. The trigger block of the other automatic locking device can interfere with the trigger slide bar 46 of the locking assembly 4, so that the trigger slide bar 46 of the locking assembly 4 is in the constraint release position. At the same time, the trigger slide bar of the other automatic locking device interferes with the trigger block of the locking assembly, so that the trigger slide bar of the other automatic locking device is in the constraint release position.

[0038] A third rotating shaft 430 is provided on the unlocking rod 41, a third through hole 431 movably engaged with the third rotating shaft 430 is provided on the active rack rod 42, and the active rack rod 42 is movably sleeved on the third rotating shaft 430 through the third through hole 431, a fourth rotating shaft 432 is provided on the lock tongue rod 48, and a fourth through hole 433 movably engaged with the fourth rotating shaft 432 is provided on the connecting rack rod 44, and the connecting rack rod 44 is movably sleeved on the fourth rotating shaft 432 through the fourth through hole 433.

[0039] The trigger portion 426 includes a trigger fixing seat 434, a trigger shaft 435 and a trigger roller 436. The trigger roller 436 is movably sleeved on the trigger shaft 435. The left and right ends of the trigger shaft 435 are respectively arranged on the trigger fixing seat 434. The trigger roller 436 extends to the outside of the front side of the trigger fixing seat 434, so that the trigger roller 436 first contacts other interference components.

[0040] The trigger roller 436 of the locking assembly 4 conflicts with the trigger block of another automatic locking device, so that the trigger slide 46 of the locking assembly 4 is in the constraint release position. At the same time, the trigger block 47 of the locking assembly 4 also conflicts with the trigger roller of another automatic locking device, so that the trigger slide of the other automatic locking device is in the constraint release position.

[0041] Please also refer to Figure 1 、 Figure 2 、 Figures 7 to 10 As shown, the present invention further discloses a packaging box, on which the automatic locking device A as described above is used.

[0042] The packing box 6 is a flat box, comprising a box body 61 and a box cover 62 provided on the top surface or both the top and bottom surfaces of the box body 61 , and the automatic locking device A is provided on the box cover 62 .

[0043] The box cover 62 includes a top front box cover 63 and a top rear box cover 64 located on the top surface of the box body 61 and open front to back, as well as a bottom front box cover 65 and a bottom rear box cover 66 located on the bottom surface of the box body 61 and open front to back. The automatic locking device A is respectively arranged on the top front box cover 63, the top rear box cover 64, the bottom front box cover 65 and the bottom rear box cover 66.

[0044] The left and right upper fixing plates 67 and 68 are respectively provided on the left and right sides of the upper opening of the box body 61, and the left and right lower fixing plates 69 and 610 are respectively provided on the left and right sides of the lower opening of the box body 61. Side panel lock holes 611 are respectively provided on the left and right upper fixing plates 67 and 68, as well as the left and right lower fixing plates 69 and 610. The active lock tongue 412 and the driven lock tongue 419 of each set of the automatic locking device A are simultaneously locked in the corresponding side panel lock holes 611. At the same time, the rotating lock hook rods 45 of the two sets of automatic locking devices A located on the top front cover 63 and the top rear cover 64 are locked with the corresponding lock hook side holes 21, and the rotating lock hook rods 45 of the two sets of automatic locking devices A located on the bottom front cover 65 and the bottom rear cover 66 are locked with the corresponding lock hook side holes 21, so that the entire box body 61 is in a locked state.

[0045] The upper cover side holes 11 of the two sets of automatic locking devices A located on the bottom front cover 65 and the bottom rear cover 66 are located on the inner side of the box body 61, so that the unlocking push button 413 is also located on the inner side of the box body 61. The user can open the lock assembly 4 of the two sets of automatic locking devices A from inside the box body 61. Because the automatic locking devices A include an active lock tongue 412, a driven lock tongue 419, and a rotating lock hook rod 45, the automatic locking devices A can achieve locking with corresponding components at three different locations, improving the reliability and stability of the locking. On the other hand, due to the provision of a trigger block 47, a trigger slide 46, and a trigger spring 411, the existing locking state will not be affected whether the two side covers 61 are closed one after another, or simultaneously, thus providing the packaging box with an automatic sealing function.

[0046] The above description is only a preferred embodiment of the present invention and is 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 scope of protection of the present invention.

Claims

1. An automatic locking device, characterized in that: The lock assembly comprises an unlocking rod, an active rack rod, a driven gear, a connecting rack rod, a rotary lock hook rod, a trigger slide rod, a trigger block, a lock tongue rod, a first locking spring and / or a second locking spring, and a trigger spring. An active lock tongue and an unlocking push button are respectively provided on the unlocking rod. The trigger block is convexly provided on the front side of the lower base plate and is movably connected between the unlocking rod and the active rack rod, and between the connecting rack rod and the lock tongue rod. An active rack is provided on the rod, a first rack, a second rack, a first slide groove and a second slide groove are provided on the connecting rack rod, a driven lock tongue is provided on the lock tongue rod, and the active lock tongue and the driven lock tongue are respectively provided on the left and right sides close to the lower base plate; the driven gear is respectively engaged with the active rack and the first rack, a first rotating shaft is provided on the driven gear, the lower end of the first rotating shaft is located in the first through hole provided on the lower base plate, and the upper end thereof is located in the first slide groove, a lock hook, a second rotating shaft and a lock hook gear are respectively provided on the rotating lock hook rod, the lock hook gear is engaged with the second rack, and the second rotating shaft The lower end of the trigger slide is located in the second through hole set in the lower base plate, and the upper end thereof is located in the second sliding groove. A lock hook side hole is provided on the front side of the lower base plate, and the lock hook extends from the lock hook side hole to the outside of the lower base plate. A brake block is provided at the rear of the trigger slide rod, and a positioning groove that cooperates with the brake block is provided on the connecting rack rod. A trigger part is provided at the front end of the trigger slide rod, and the trigger part is located outside the front side of the lower base plate; when the lock assembly is in a locked state, the trigger slide rod is in a constraint release position, the brake block is moved out of the positioning groove, the connecting rack rod can be moved left and right, and the active lock tongue, the driven lock tongue and the rotating When the latch is in the unlocked position, the trigger slide is in the restricted position, the brake block is in the positioning groove, the connecting rack rod cannot be moved left and right, the active lock tongue, the driven lock tongue and the rotating lock hook rod are in the unlocked position, and the active lock tongue, the driven lock tongue and the lock hook are respectively retracted into the cavity.

2. The automatic locking device according to claim 1, characterized in that: An upper cover side hole for installing an unlocking push button is provided on the upper cover plate, and the height of the unlocking push button is lower than the top surface of the upper cover plate.

3. The automatic locking device according to claim 2, characterized in that: An anti-theft plug-in is also provided in the side hole of the upper cover. The anti-theft plug-in includes a plug-in board, a connecting part and an elastic snap buckle. The connecting part is a breakable part and is located between the plug-in board and the elastic snap buckle. A slot is provided on the unlocking button, and a locking edge is provided on the side of the slot. The elastic snap buckle passes through the slot and locks with the locking edge. The plug-in board covers the unlocking button to prevent the unlocking button from being accidentally touched and causing an unlocking action.

4. The automatic locking device according to claim 1, wherein: A spring positioning block is provided on the lock tongue rod, a second locking spring is installed between the spring positioning block and the driven lock tongue, a limiting groove is provided on the spring positioning block, and a limiting protrusion matched with the limiting groove is provided on the lower base plate.

5. The automatic locking device according to claim 1, wherein: Other locking components are also provided on the front sides of the upper cover plate and the lower base plate, and another automatic locking device is provided on the other locking components. The trigger block of the other automatic locking device conflicts with the trigger slide bar of the locking assembly, so that the trigger slide bar of the locking assembly is in a constraint release position. At the same time, the trigger slide bar of the other automatic locking device conflicts with the trigger block of the locking assembly, so that the trigger slide bar of the other automatic locking device is in a constraint release position.

6. The automatic locking device according to claim 1, characterized in that: A third rotating shaft is provided on the unlocking rod, a third through hole movably matched with the third rotating shaft is provided on the active rack rod, a fourth rotating shaft is provided on the lock tongue rod, and a fourth through hole movably matched with the fourth rotating shaft is provided on the connecting rack rod.

7. The automatic locking device according to claim 1, characterized in that: The trigger part includes a trigger fixing seat, a trigger shaft and a trigger roller. The trigger roller is movably sleeved on the trigger shaft. The left and right ends of the trigger shaft are respectively arranged on the trigger fixing seat. The trigger roller extends to the outside of the front side of the trigger fixing seat.

8. A packaging box, characterized in that: The packaging box is provided with an automatic locking device as claimed in any one of claims 1 to 7.

9. The packaging box according to claim 8, characterized in that: The packing box is a flat box, comprising a box body and a box cover arranged on the top surface or both the top and bottom surfaces of the box body, and the automatic locking device is arranged on the box cover.

10. The packaging box according to claim 9, characterized in that: The box cover includes a top front box cover and a top rear box cover located on the top surface of the box body and opened front to back, as well as a bottom front box cover and a bottom rear box cover located on the bottom surface of the box body and opened front to back. The automatic locking device is respectively arranged on the top front box cover, the top rear box cover, the bottom front box cover and the bottom rear box cover.

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