CN115387678A - Automatic locking device and packaging box using same - Google Patents

Abstract

The invention relates to an automatic locking device and a packing box using the same, wherein the automatic locking device comprises an upper cover plate and a lower bottom plate, a locking assembly is arranged in a cavity between the upper cover plate and the lower bottom plate, and the locking assembly comprises an unlocking rod, a driving rack rod, a driven gear, a connecting rack rod, a rotary locking hook rod, a trigger slide rod, a trigger block, a locking tongue rod, a first locking spring and/or a second locking spring and a trigger spring. The unlocking rod is respectively provided with a driving spring bolt and an unlocking push button, the spring bolt rod is provided with a driven spring bolt, the rotary lock hook rod is respectively provided with a lock hook, the front side surface of the lower base plate is provided with a lock hook side hole, the lock hook extends out of the outer part of the lower base plate from the lock hook side hole, the rear part of the trigger slide rod is provided with a brake block, and the connecting rack rod is provided with a positioning groove matched with the brake block. The automatic locking device is arranged at the opening of the packaging box body, so that the packaging box has the function of automatically sealing the box and can be used on a full-automatic packaging production line.

Description

Automatic locking device and packing box using same

Technical Field

The invention belongs to the technical field of lock catch connection, and particularly relates to an automatic lock catch device and a packaging box using the same.

Background

The existing packaging box is mostly a paper box, and the adhesive tape sealing box for the paper box can not be recycled. Although some packing boxes can be recycled, and a locking device is arranged at the box opening of the box body, the locking device cannot realize automatic box sealing and cannot be used on a full-automatic packaging production line.

Disclosure of Invention

The invention aims to solve the technical problem of providing an automatic locking device and a packaging box using the same, wherein the automatic locking device is arranged at a box opening of a packaging box body, has the function of automatically sealing the box, can be used on a full-automatic packaging production line, and can recycle the packaging box to reduce the cost.

The invention is realized in this way, provide an automatic locking device, including upper cover plate and lower floor connected together from top to bottom, set up the volume between upper cover plate and lower floor, set up the locking assembly in the volume, the said locking assembly includes the unlocking lever, initiative rack bar, driven gear, connecting rack bar, rotary lock hook pole, trigger the slide bar, trigger the block, lock tongue pole, first locking spring and/or second locking spring, and trigger the spring, set up initiative lock tongue and unlock the button on the unlocking lever separately, the trigger block is protruding to be set up in the front side of the lower floor, between unlocking lever and initiative rack bar, and between connecting rack bar and lock tongue pole separately swing joint, set up the initiative rack bar on the initiative rack bar, set up the first rack, second rack, first concrete chute and second concrete chute on the connecting rack bar, set up the driven lock tongue on the lock tongue, initiative lock tongue and driven lock tongue are set up in the left and right sides near the lower floor separately; the driven gear is simultaneously and respectively meshed with the driving rack and the first rack, a first rotating shaft is arranged on the driven gear, the lower end of the first rotating shaft is positioned in a first through hole arranged on the lower bottom plate, the upper end of the first rotating shaft is positioned in a first sliding groove, a locking hook, a second rotating shaft and a locking hook gear are respectively arranged on a rotary locking hook rod, the locking hook gear is meshed with the second rack, the lower end of the second rotating shaft is positioned in a second through hole arranged on the lower bottom plate, the upper end of the second rotating shaft is positioned in a second sliding groove, a locking hook side hole is arranged on the front side surface of the lower bottom plate, the locking hook extends out of the lower bottom plate from the locking hook side hole, a brake block is arranged at the rear part of the trigger sliding rod, a positioning groove matched with the brake block is arranged on the connecting rack rod, a trigger part is arranged at the front end of the trigger sliding rod, and the trigger part is positioned outside the front side surface of the lower bottom plate; when the lock catch assembly is in a locked state, the trigger slide rod is in a restriction release position, the brake block is moved out of the positioning groove, the connecting rack rod can be moved left and right, the driving lock tongue, the driven lock tongue and the rotary lock hook rod are respectively in a locked position, the driving lock tongue and the driven lock tongue respectively extend out of the cavity and are positioned on the outer side of the lower bottom plate and are respectively in locked connection with jacks on other matched locked parts, and the lock hook is screwed out of the cavity from a lock hook side hole and is in locked connection with lock holes on other matched locked parts; when the lock catch assembly is in an unlocking state, the trigger slide rod is in the restriction position, the brake block is positioned in the positioning groove, the connecting rack rod cannot be moved left and right, the driving lock tongue, the driven lock tongue and the rotary lock hook rod are respectively in the unlocking position, and the driving lock tongue, the driven lock tongue and the lock hook are respectively withdrawn into the containing cavity.

Furthermore, an upper cover side hole for installing an unlocking push button is formed in the upper cover plate, and the unlocking push button is lower than the top surface of the upper cover plate.

Further, still set up theftproof plug-in components in the upper cover curb hole, theftproof plug-in components include plug-in components board, connecting portion and elasticity buckle, and connecting portion are the parts of easily breaking and are located between plug-in components board and the elasticity buckle, set up the fluting on the unblock push button, set up the locking limit at the notched side, elasticity buckle passes behind the fluting and locks each other with the locking limit, and plug-in components board will unblock push button cover and prevent that unblock push button from being touched and bumping by the mistake and taking place the unblock action.

Furthermore, a spring positioning block is arranged on the bolt rod, the second locking spring is installed between the spring positioning block and the driven bolt, a limiting groove is formed in the spring positioning block, and a limiting bump matched with the limiting groove is arranged on the lower bottom plate.

Furthermore, other locking parts are arranged on the front side edges of the upper cover plate and the lower bottom plate, another automatic locking device is arranged on the other locking parts, a trigger block of the other automatic locking device can be abutted against a trigger slide bar of the locking component, so that the trigger slide bar of the locking component is positioned at a restriction releasing position, and meanwhile, a trigger slide bar of the other automatic locking device is abutted against the trigger block of the locking component, so that the trigger slide bar of the other automatic locking device is positioned at the restriction releasing position.

Furthermore, a third rotating shaft is arranged on the unlocking rod, a third through hole which is in movable fit with the third rotating shaft is arranged on the driving rack rod, a fourth rotating shaft is arranged on the lock tongue rod, and a fourth through hole which is in movable fit with the fourth rotating shaft is arranged on the connecting rack rod.

Furthermore, trigger the portion including trigger the fixing base, trigger the pivot and trigger the gyro wheel, trigger the pivot that the gyro wheel cup jointed movably on, trigger the pivot about both ends set up respectively on triggering the fixing base, trigger the gyro wheel and extend to the front side outside that triggers the fixing base.

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

Further, the packing box is a flat box, the packing box comprises a box body and box covers arranged on the top surface or the top and bottom surfaces of the box body, and the automatic locking device is arranged on the box covers.

Further, the case lid is including the top front case lid and the top back case lid that are located box top surface and run from opposite directions to open to and, and be located box bottom surface and run from opposite directions the bottom front case lid and the bottom back case lid that run from opposite directions, automatic locking device sets up respectively in the top front case lid, top back case lid, the bottom front case lid and the bottom back case lid on.

Compared with the prior art, the automatic locking device and the packing box using the same are provided, the automatic locking device comprises an upper cover plate and a lower base plate which are connected together up and down, a locking assembly is arranged in a cavity between the upper cover plate and the lower base plate, and the locking assembly comprises an unlocking rod, a driving rack rod, a driven gear, a connecting rack rod, a rotating locking hook rod, a triggering sliding rod, a triggering block, a locking tongue rod, a first locking spring and/or a second locking spring and a triggering spring. The unlocking rod is respectively provided with a driving spring bolt and an unlocking push button, the spring bolt rod is provided with a driven spring bolt, the rotary lock hook rod is respectively provided with a lock hook, the front side surface of the lower base plate is provided with a lock hook side hole, the lock hook extends out of the outer part of the lower base plate from the lock hook side hole, the rear part of the trigger slide rod is provided with a brake block, and the connecting rack rod is provided with a positioning groove matched with the brake block. When the lock catch assembly is in a locked state, the trigger slide rod is in a restriction releasing position, the brake block moves out of the positioning groove, the connecting rack rod can be moved left and right, the driving spring bolt, the driven spring bolt and the rotary lock hook rod are respectively in a locked position, the driving spring bolt and the driven spring bolt respectively extend out of the cavity and are positioned on the outer side edge of the lower bottom plate and are respectively in locked connection with jacks on other matched locked components, and the lock hook is screwed out of the cavity from the lock hook side hole and is in locked connection with lock holes on other matched locked components. When the lock catch assembly is in an unlocking state, the trigger slide rod is located at the restriction position, the brake block is located in the positioning groove, the connecting rack rod cannot be moved left and right, the driving lock tongue, the driven lock tongue and the rotary lock hook rod are respectively located at the unlocking positions, and the driving lock tongue, the driven lock tongue and the lock hook are respectively retracted to be located in the containing cavity. The automatic locking device is arranged at the opening of the packaging box body, has the function of automatically sealing the box, can be used on a full-automatic packaging production line, and can recycle the packaging box, thereby reducing the cost.

Drawings

FIG. 1 is a perspective view of a preferred embodiment of the automatic locking device of the present invention;

fig. 2 is a perspective view of fig. 1 with the upper cover plate removed and the latch assembly in a locked state;

fig. 3 is a perspective view of the latch assembly of fig. 2 with the lower base plate removed and the latch assembly in a latched condition;

fig. 4 is a perspective view of the latch assembly of fig. 3 at another angle and in an unlocked position;

fig. 5 is a perspective view of the linking rack bar of fig. 4;

FIG. 6 is a perspective view of the anti-theft insert of FIG. 3;

FIG. 7 is a perspective view of the package of the present invention;

FIG. 8 is a perspective view of the package of FIG. 7 with the lid open on one side of the package;

FIG. 9 is a perspective view of the container shown in FIG. 7 with the upper cover removed from the automatic locking device;

fig. 10 is a perspective view of the package of fig. 7 with the body and lid removed.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, 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 merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1 to 5, 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 disposed between the upper cover plate 1 and the lower base plate 2, and a locking assembly 4 is disposed in the cavity 3. The upper deck 1 and the lower deck 2 are fixed together by a plurality of bolts (not shown in the drawings).

The latch assembly 4 includes an unlocking lever 41, a driving rack bar 42, a driven gear 43, a connecting rack bar 44, a rotating latch lever 45, a trigger slide bar 46, a trigger block 47, a latch lever 48, a first locking spring 49 and/or a second locking spring 410, and a trigger spring 411. The unlocking lever 41 is provided with an active latch 412 and an unlocking push button 413, respectively. The first locking spring 49 is arranged at the right side of the unlocking push button 413, the trigger spring 411 is arranged at the rear side of the trigger slide bar 46, and the trigger block 47 is convexly arranged at the front side of the lower base plate 2. The unlocking lever 41 and the driving rack bar 42 are movably connected to each other, and the connecting rack bar 44 and the latch bar 48 are movably connected to each other. The driving rack 414 is arranged on the driving rack rod 42, the first rack 415, the second rack 416, the first sliding chute 417 and the second sliding chute 418 are arranged on the connecting rack rod 44, the driven bolt 419 is arranged on the bolt rod 48, the second locking spring 410 is arranged on the left side edge of the driven bolt 419, and the driving bolt 412 and the driven bolt 419 are respectively arranged on the left side edge and the right side edge close to the lower bottom plate 2.

The driven gear 43 is engaged with the driving rack 414 and the first rack 415, respectively, and a first rotating shaft 420 is disposed on the driven gear 43, and a lower end of the first rotating shaft 420 is disposed in a first through hole (not shown) disposed on the lower plate 2, and an upper end thereof is disposed in the first sliding groove 417. The rotating latch lever 45 is respectively provided with a latch hook 421, a second rotating shaft 422 and a latch hook gear 423, the latch hook gear 423 is engaged 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 of the second rotating shaft is located in the second sliding groove 418. A latch hook side hole 21 is formed on the front side of the lower plate 2, a latch hook 421 protrudes from the latch hook side hole 21 to the outside of the lower plate 2, a brake block 424 is formed at the rear of the trigger slide bar 46, a positioning groove 425 matched with the brake block 424 is formed on the connecting rack bar 44, a trigger 426 is formed at the front end of the trigger slide bar 46, and the trigger 426 is located outside the front side of the lower plate 2.

When the locking assembly 4 is in the locked state, the trigger sliding rod 46 is in the restriction release position, the brake block 424 is moved out from the positioning groove 425, the connecting rack rod 44 can be moved left and right, the driving latch tongue 412, the driven latch tongue 419 and the rotary locking hook rod 45 are respectively in the locked position, the driving latch tongue 412 and the driven latch tongue 419 respectively extend out of the cavity 3 and are positioned at the outer side of the lower base plate 2 and are respectively in locked connection with the insertion holes (not shown) on other locking parts matched with the driving latch tongue 412, the driven latch tongue 419 and the rotary locking hook rod 45, and the locking hook 421 is rotated out of the cavity 3 from the locking hook side hole 21 and is in locked connection with the locking holes (not shown) on other locking parts matched with the locking hook.

When the latch assembly 4 is in the unlocked state, the trigger sliding rod 46 is in the restricting position, the brake block 424 is located in the positioning groove 425, the connecting rack bar 44 cannot be moved left and right, the driving latch tongue 412, the driven latch tongue 419 and the rotary latch hook rod 45 are respectively in the unlocking position, and the driving latch tongue 412, the driven latch tongue 419 and the latch hook 421 are respectively located in the cavity 3.

Specifically, when the trigger part 426 is pressed to force the trigger slide 46 to move backward, the trigger spring 411 is pressed, the brake block 424 moves out of the positioning groove 425, the connection rack bar 44 is released, and the trigger slide 46 is in the restriction release position. At this time, under the action of the first locking spring 49, the unlocking rod 41 and the active latch 412 move leftward, and the active latch 412 moves leftward to be in the locking position; under the action of the second locking spring 410, the latch rod 48 and the connecting rack rod 44 move rightwards simultaneously, and the driven latch 419 moves rightwards to be in a locking position; the second rack 416 drives the rotating latch hook rod 45 to rotate counterclockwise to be in the locking position, and the first rotating shaft 420 and the second rotating shaft 422 are respectively located at the right of the first sliding slot 417 and the second sliding slot 418.

Specifically, when the unlocking rod 41 is pushed to move rightwards, the driving lock tongue 412 moves rightwards to be located in an unlocking position in the cavity 3, the first locking spring 49 is compressed, the driving rack rod 42 drives the driven gear 43 to rotate anticlockwise to drive the connecting rack rod 44 to move leftwards, the rotating lock hook rod 45 rotates clockwise to be located in the unlocking position in the cavity, meanwhile, the lock tongue rod 48 moves leftwards, the driven lock tongue 419 moves leftwards to be located in the unlocking position in the cavity, and the second locking spring 410 is compressed; when the positioning slot 425 of the connecting rack bar 44 is moved to the position of the brake block 424, the brake block 424 moves forward into the positioning slot 425 under the action of the trigger spring 411, the trigger slide bar 46 is in the restraining position, and the first rotating shaft 420 and the second rotating shaft 422 are respectively positioned at the left of the first sliding slot 417 and the second sliding slot 418.

Thus, the latch assembly 4 has a linkage feature, but also has a trigger feature.

An upper cover side hole 11 for installing an unlocking push button 413 is formed in the upper cover plate 1, and the unlocking push button 413 is lower than the top surface of the upper cover plate 1.

Referring to fig. 1, 3 and 6, an anti-theft plug 5 is further disposed in the upper cover side hole 11. The antitheft plug-in 5 includes a plug-in board 51, a connecting portion 52, and an elastic buckle 53, and the connecting portion 52 is a frangible member and is located between the plug-in board 51 and the elastic buckle 53. The unlocking button 413 is provided with a slot 427, a locking edge (not shown in the figure) is arranged at the side edge of the slot 427, the elastic buckle 53 passes through the slot 427 and then is locked with the locking edge, and the plug-in board 51 covers the unlocking button 413 to prevent the unlocking button 413 from being touched by mistake to generate unlocking action.

A spring positioning block 428 is arranged on the latch rod 48, the second locking spring 410 is installed between the spring positioning block 428 and the driven latch 419, a limiting groove 429 is arranged on the spring positioning block 428, and a limiting projection 22 matched with the limiting groove 429 is arranged on the lower base plate 2.

The front sides of the upper cover plate 1 and the lower base plate 2 are also provided with other locking parts, the other locking parts are provided with another automatic locking device, a trigger block of the other automatic locking device can be mutually abutted with the trigger slide bar 46 of the locking component 4, so that the trigger slide bar 46 of the locking component 4 is positioned at a restriction releasing position, and meanwhile, the trigger slide bar of the other automatic locking device is mutually abutted with the trigger block of the locking component, so that the trigger slide bar of the other automatic locking device is positioned at the restriction releasing position.

The unlocking rod 41 is provided with a third rotating shaft 430, the driving rack rod 42 is provided with a third through hole 431 in movable fit with the third rotating shaft 430, the driving rack rod 42 is movably sleeved on the third rotating shaft 430 through the third through hole 431, the latch rod 48 is provided with a fourth rotating shaft 432, the connecting rack rod 44 is provided with a fourth through hole 433 in movable fit with the fourth rotating shaft 432, and the connecting rack rod 44 is movably sleeved on the fourth rotating shaft 432 through the fourth through hole 433.

The triggering part 426 includes a triggering fixing seat 434, a triggering rotating shaft 435 and a triggering roller 436, the triggering rotating shaft 435 movably sleeved on the triggering roller 436 is provided with left and right ends of the triggering rotating shaft 435 respectively disposed on the triggering fixing seat 434, and the triggering roller 436 extends to the front outer side of the triggering fixing seat 434, so that the triggering roller 436 firstly contacts with other contact parts.

The trigger roller 436 of the latch assembly 4 is abutted against the trigger block of another automatic latch device, so that the trigger slide bar 46 of the latch assembly 4 is in the restriction release position, and meanwhile, the trigger block 47 of the latch assembly 4 is also abutted against the trigger roller of another automatic latch device, so that the trigger slide bar of another automatic latch device is in the restriction release position.

Referring to fig. 1, 2, 7 to 10, the present invention further discloses a packing box, wherein the packing box 6 is provided with the automatic locking device a.

The packing box 6 is a flat box, the packing box 6 comprises a box body 61 and box covers 62 arranged on the top surface or the top and bottom surfaces of the box body 61, and the automatic locking device A is arranged on the box covers 62.

The box cover 62 comprises a top front box cover 63 and a top rear box cover 64 which are positioned on the top surface of the box body 61 and are opened front and back, and a bottom front box cover 65 and a bottom rear box cover 66 which are positioned on the bottom surface of the box body 61 and are opened front and back, and the automatic locking devices A are 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.

Left and right upper fixing plates 67 and 68 are provided on left and right side surfaces of an upper opening of the case 61, respectively, and left and right lower fixing plates 69 and 610 are provided on left and right side surfaces of a lower opening of the case 61, respectively. Side plate locking holes 611 are provided in the left and right upper fixing plates 67 and 68, and the left and right lower fixing plates 69 and 610, respectively. The driving lock tongue 412 and the driven lock tongue 419 of each set of automatic locking device a are simultaneously locked in the corresponding side plate lock hole 611, meanwhile, the rotary lock hook rods 45 of the two sets of automatic locking devices a located in the top front box cover 63 and the top rear box cover 64 are mutually locked with the corresponding lock hook side holes 21, and the rotary lock hook rods 45 of the two sets of automatic locking devices a located in the bottom front box cover 65 and the bottom rear box cover 66 are mutually locked with the corresponding lock hook side holes 21, so that the whole box body 61 is in a locked state.

The upper cover side holes 11 of the two sets of automatic locking devices a located on the front bottom cover 65 and the rear bottom cover 66 are located on the inner side surface of the box body 61, so that the unlocking push button 413 is also located on the inner side surface of the box body 61, and a user can respectively open the locking components 4 of the two sets of automatic locking devices a from the inside of the box body 61. Because the automatic locking device a respectively comprises the driving bolt 412, the driven bolt 419 and the rotary latch rod 45, the automatic locking device a realizes the locking with corresponding parts at three different positions, and improves the reliability and stability during locking. On the other hand, due to the arrangement of the trigger block 47, the trigger slide rod 46 and the trigger spring 411, the existing locking state of the two side box covers 61 cannot be influenced no matter the box covers are covered firstly, secondly or simultaneously, so that the packing box has an automatic box sealing function.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. An automatic locking device is characterized by comprising an upper cover plate and a lower base plate which are connected together up and down, wherein a containing cavity is arranged between the upper cover plate and the lower base plate, a locking assembly is arranged in the containing cavity, the locking assembly comprises an unlocking rod, a driving rack rod, a driven gear, a connecting rack rod, a rotary locking hook rod, a trigger slide rod, a trigger block, a locking tongue rod, a first locking spring and/or a second locking spring and the trigger spring, the unlocking rod is respectively provided with a driving locking tongue and an unlocking push button, the trigger block is convexly arranged on the front side surface of the lower base plate, the unlocking rod and the driving rack rod and the connecting rack rod and the locking tongue rod are respectively and movably connected, the driving rack rod is provided with a driving rack, the connecting rack rod is provided with a first rack, a second rack, a first sliding chute and a second sliding chute, the locking tongue rod is provided with a driven locking tongue, and the locking tongue and the driven locking tongue are respectively arranged on the left side edge and the right side edge close to the lower base plate; the driven gear is meshed with the driving rack and the first rack respectively, a first rotating shaft is arranged on the driven gear, the lower end of the first rotating shaft is positioned in a first through hole formed in the lower base plate, the upper end of the first rotating shaft is positioned in a first sliding groove, a lock hook, a second rotating shaft and a lock hook gear are arranged on the rotary lock hook rod respectively, the lock hook gear is meshed with the second rack, the lower end of the second rotating shaft is positioned in a second through hole formed in the lower base plate, the upper end of the second rotating shaft is positioned in a second sliding groove, a lock hook side hole is formed in the front side face of the lower base plate, the lock hook extends out of the lower base plate from the lock hook side hole, a brake block is arranged at the rear part of the trigger slide rod, a positioning groove matched with the brake block is formed in the connecting rack rod, a trigger part is arranged at the front end of the trigger slide rod, and the trigger part is positioned outside the front side face of the lower base plate; when the lock catch assembly is in a locked state, the trigger slide rod is in a restriction releasing position, the brake block moves out of the positioning groove, the connecting rack rod can be moved left and right, the driving lock tongue, the driven lock tongue and the rotary lock hook rod are respectively in a locked position, the driving lock tongue and the driven lock tongue respectively extend out of the cavity and are positioned on the outer side edge of the lower bottom plate and are respectively in locked connection with jacks on other matched locked parts, and the lock hook is screwed out of the cavity from a lock hook side hole and is in locked connection with lock holes on other matched locked parts; when the lock catch assembly is in an unlocking state, the trigger slide rod is in the restriction position, the brake block is positioned in the positioning groove, the connecting rack rod cannot be moved left and right, the driving lock tongue, the driven lock tongue and the rotary lock hook rod are respectively in the unlocking position, and the driving lock tongue, the driven lock tongue and the lock hook are respectively withdrawn into the containing cavity.

2. The automatic locking device of claim 1, wherein an upper cover side hole for installing an unlocking push button is provided on the upper cover plate, and the unlocking push button is lower than a top surface of the upper cover plate.

3. The automatic locking device according to claim 2, wherein an anti-theft plug-in is further disposed in the side hole of the upper cover, the anti-theft plug-in comprises a plug-in plate, a connecting portion and an elastic buckle, the connecting portion is a breakable member and is located between the plug-in plate and the elastic buckle, a slot is disposed on the unlocking push button, a locking edge is disposed on a side of the slot, the elastic buckle penetrates through the slot and is mutually locked with the locking edge, and the plug-in plate covers the unlocking push button to prevent the unlocking push button from being touched by mistake and causing unlocking action.

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

5. The automatic locking device according to claim 1, wherein other locking parts are further provided on the front sides of the upper and lower plates, and another automatic locking device is provided on the other locking parts, and the trigger bar of the other automatic locking device can abut against the trigger bar of the locking assembly to place the trigger bar of the locking assembly in the restriction release position, while the trigger bar of the other automatic locking device abuts against the trigger bar of the locking assembly to place the trigger bar of the other automatic locking device in the restriction release position.

6. The automatic locking device according to claim 1, wherein a third rotating shaft is provided on the unlocking lever, a third through hole which is fitted to the third rotating shaft is provided on the driving rack bar, a fourth rotating shaft is provided on the latch bar, and a fourth through hole which is fitted to the fourth rotating shaft is provided on the connecting rack bar.

7. The automatic locking device of claim 1, wherein the trigger part comprises a trigger fixing seat, a trigger rotating shaft and a trigger roller, the trigger rotating shaft movably sleeved on the trigger roller, the left and right ends of the trigger rotating 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.

8. A packaging box, characterized in that the automatic locking device of any one of claims 1 to 7 is used on the packaging box.

9. The packaging box according to claim 8, wherein the packaging box is a flat box, the packaging box comprises a box body and a box cover arranged on the top surface or the bottom surface of the box body, and the automatic locking device is arranged on the box cover.

10. The package of claim 9 wherein the cover comprises a top front cover and a top rear cover on the top surface of the box body and facing forward and backward, and a bottom front cover and a bottom rear cover on the bottom surface of the box body and facing forward and backward, the automatic locking devices being disposed on the top front cover, the top rear cover, the bottom front cover, and the bottom rear cover, respectively.

Images