Three-dimensional protective bag anti-theft device

Abstract

The present application relates to the field of commodity theft prevention, and aims to provide a three-dimensional protection bag anti-theft device, which has high adhesion to commodities and good anti-theft effect. The technical scheme is a three-dimensional protection bag anti-theft device, which comprises a protection bag and an anti-theft label. The protection bag comprises a cylindrical bag body made of an embedded alarm circuit covering conductive film. A base with a latch is arranged at the bag opening of the protection bag, and the input end of the alarm circuit is located in the base. The anti-theft label is provided with a lock hole, an elastic contact, a linkage mechanism and a circuit board.

Description

Technical Field

[0001] The present invention relates to the field of commodity theft prevention, in particular to a three-dimensional protective bag theft prevention device. Background Art

[0002] Anti-theft tags are commonly used as merchandise anti-theft alarm devices in shopping malls, supermarkets, and department stores. As shown in "CN112216051A Protective Bag for Alarm Tags" and "CN213339014U Multifunctional Protective Bag Label," these transparent bags wrap the merchandise, providing both a sealed and protective seal while clearly displaying the contents. This makes them extremely convenient to use. The anti-theft tag is installed in the top opening of the bag, working in conjunction with the bag itself to provide anti-theft protection.

[0003] The defects of the above structure are: the bag body is made by folding in half, and the overall shape is flat, which is mainly used to pack irregular-shaped goods. The bag body cannot fit well on the surface of the goods during packaging, and the anti-theft label is only suitable for installation on such a bag body. Therefore, the entire device does not fully consider the matching between the various components and the goods. During actual use, it is easy to generate multiple wrinkles and gaps between the anti-theft label and the goods, and between the bag body and the goods. Especially for regular-shaped goods, the adaptability is poor, resulting in the inability to display the goods in a neat and beautiful posture, affecting the display effect. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies in the above-mentioned background technology and to provide a three-dimensional protective bag anti-theft device, which should have the characteristics of high fit with the product and good anti-theft effect.

[0005] The technical solution of the present invention is:

[0006] A three-dimensional protective bag anti-theft device includes a protective bag and an anti-theft tag; the characteristics are: the protective bag includes a cylindrical bag body made of a laminated conductive film with a built-in alarm circuit, a base with a latch is arranged at the bag opening of the protective bag, and the input and output terminals of the alarm circuit are located in the base; the anti-theft tag is provided with a lock hole, elastic contacts, a linkage mechanism, and a circuit board;

[0007] When locking, the pin is inserted into the keyhole, the linkage mechanism clamps the pin, the anti-theft tag is fixed to the base and locks the bag opening of the protective bag, and the elastic contact presses against the input end and the input end to connect the circuit board with the alarm circuit; when unlocking, the linkage mechanism releases the pin, and the anti-theft tag is separated from the base to open the bag opening.

[0008] The linkage mechanism includes a push rod, a push rod spring for resetting the push rod, a lock core for fixing the push rod, a lock block, and a lock block spring for pressing the lock block against the push rod;

[0009] When locking, the bolt is inserted into the lock hole and the push rod is pressed, the push rod pushes the lock block to block the bolt, and the lock cylinder locks the push rod; when unlocking, the lock cylinder releases the push rod, the push rod resets to make the lock block disengage from the bolt, and the bolt can be pulled out of the lock hole.

[0010] The lock block and the push rod are slidably positioned in the shell of the anti-theft label, the sliding directions of the lock block and the push rod are perpendicular to each other, and an inclined surface for pushing the lock block is formed on the push rod; the lock hole and the elastic contact are arranged on the bottom surface of the shell.

[0011] The lock cylinder comprises a lock head slidably positioned in the shell, a lock head spring for pushing the lock head, and a lock head hole formed on the push rod and matched with the lock head.

[0012] The push rod is provided with two lock blocks on each side, the lock blocks on the same side are connected as a whole, and four lock holes are formed on the bottom surface of the shell; one end of the lock block abuts against the push rod, and the other end is provided with a lock hook.

[0013] The anti-theft label further comprises a coil, a buzzer and a battery.

[0014] The protective bag has a cuboid or cylindrical shape, the bag opening of the protective bag is provided with two top covers, each top cover is provided with a base, the bases are fixed through a plug-in structure to make the top covers cover the bag opening of the protective bag; the input end and the output end are arranged on the top cover; and a jack is formed on the base for the elastic contact to extend into.

[0015] The protective bag has a cuboid shape, the bag opening of the protective bag is provided with two top covers and two side covers, the side covers are fixed through buckles; the bag bottom of the protective bag is provided with four bottom covers, the bottom covers are fixed through welding, and each base is provided with two bolts.

[0016] The protective bag has a cylindrical shape, the bag opening of the protective bag is provided with two top covers and at least two side covers, the side covers are fixed through buckles; the bag bottom of the protective bag is provided with two bottom covers and at least two auxiliary bottom covers, the bottom covers and the auxiliary bottom covers are fixed through welding, and each base is provided with two bolts.

[0017] The plug-in direction of the base is perpendicular to the sliding direction of the lock block; the laminated conductive film comprises an inner layer, a mesh metal layer as an alarm circuit and an outer layer, or the laminated conductive film comprises a first inner layer, a second inner layer, a mesh metal layer as an alarm circuit and an outer layer.

[0018] The present application has the following beneficial effects:

[0019] The present invention is suitable for protecting alcoholic products. The shape of the protective bag is cylindrical, which can be well adapted to the shape of the product. The opening and closing method of the protective bag is similar to that of a packaging box. The bag body is transparent and can clearly display the internal products. The anti-theft label is installed on the top of the protective bag and is electrically connected to the alarm circuit of the protective bag. Locking and unlocking are very convenient, and an alarm can be issued in time when the bag body is damaged. When the present invention is in a locked state, the protective bag wraps the product very snugly. The anti-theft label is also snugly adapted to the shape of the product due to being installed on the top of the protective bag. It is easy to operate, firmly connected, and has a beautiful and elegant appearance. It can not only better display the product, but also ensure an anti-theft effect, thus meeting the usage needs of customers. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0021] Figure 2 This is one of the three-dimensional structural diagrams of the anti-theft label of the present invention.

[0022] Figure 3 This is the second schematic diagram of the three-dimensional structure of the anti-theft label of the present invention.

[0023] Figure 4 It is a schematic diagram of the main structure of the anti-theft label of the present invention.

[0024] Figure 5 It is a right side structural schematic diagram of the anti-theft label of the present invention.

[0025] Figure 6 yes Figure 4 Schematic diagram of the cross-sectional structure in the AA direction.

[0026] Figure 7 It is an exploded view of the anti-theft label of the present invention.

[0027] Figure 8 This is one of the schematic diagrams showing the positional relationship between the locking block and the push rod of the present invention.

[0028] Figure 9 This is the second schematic diagram of the positional relationship between the locking block and the push rod of the present invention.

[0029] Figure 10 It is a schematic diagram of the three-dimensional structure of the locking block of the present invention.

[0030] Figure 11 It is a schematic diagram of the three-dimensional structure of the push rod of the present invention.

[0031] Figure 12 It is a schematic diagram of the three-dimensional structure of the circuit board of the present invention.

[0032] Figure 13 This is one of the three-dimensional structural schematic diagrams of the rectangular protective bag of the present invention.

[0033] Figure 14 This is the second schematic diagram of the three-dimensional structure of the rectangular protective bag of the present invention.

[0034] Figure 15 It is a schematic diagram of the unfolded structure of the rectangular protective bag of the present invention.

[0035] Figure 16 This is one of the three-dimensional structural schematic diagrams of the cylindrical protective bag of the present invention.

[0036] Figure 17 This is the second schematic diagram of the three-dimensional structure of the cylindrical protective bag of the present invention.

[0037] Figure 18 It is a schematic diagram of the unfolded structure of the cylindrical protection bag of the present invention.

[0038] Figure 19 This is one of the three-dimensional structural schematic diagrams of the base of the present invention.

[0039] Figure 20 This is the second schematic diagram of the three-dimensional structure of the base of the present invention.

[0040] Figure 21 It is a schematic cross-sectional structural diagram of the base of the present invention.

[0041] Reference numerals:

[0042] Protective bag 1, top cover 1-1, side cover 1-2, bottom cover 1-3, auxiliary bottom cover 1-4, connecting hole 1-9;

[0043] Anti-theft tag 2, lock hole 2-1, elastic contact 2-2, circuit board 2-3, coil 2-4, buzzer 2-5, battery 2-6, switch 2-7, indicator light 2-8, upper shell 2-11, upper shell hole 2-11-1, lower shell 2-12, battery holder 2-13, hook 2-14;

[0044] Base 3, jack 3-1, latch 3-2, bayonet 3-2-1, first upper insert plate 3.11, first lower insert plate 3.12, second lower insert plate 3.22, second upper insert plate 3.21, upper baffle 3.3, lower baffle 3.4;

[0045] Push rod 4-1, inclined surface 4-1-1, lock head hole 4-1-2, push rod spring 4-2, lock block 4-3, lock hook 4-3-1, contact end 4-3-2, cavity 4-3-3, lock block spring 4-4, lock head 4-5, lock head spring 4-6;

[0046] Buckle 5, alarm circuit 6, input terminal 6-1, output terminal 6-2. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be 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.

[0048] like Figure 1 As shown, the three-dimensional protective bag anti-theft device comprises a protective bag 1 and an anti-theft tag 2. The protective bag is used to hold goods (especially alcoholic goods), and the anti-theft tag is installed on the protective bag for locking or unlocking.

[0049] 1. Anti-theft tags

[0050] The anti-theft tag includes a housing, a lock hole 2-1, an elastic contact 2-2, a linkage mechanism, a circuit board 2-3, a coil 2-4, a buzzer 2-5, and a battery 2-6.

[0051] The linkage mechanism, circuit board, coil, buzzer, and battery are disposed within the housing. The circuit board is electrically connected to the elastic contact and buzzer. The elastic contact contacts the protective bag, and the buzzer generates an alarm. The battery provides power. The coil cooperates with an external antenna to generate an alarm at frequencies of 58 kHz and 8.2 MHz. The circuit board is also provided with a switch 2-7 and an indicator light 2-8.

[0052] The housing is composed of an upper shell 2-11 and a lower shell 2-12. The upper shell is provided with an upper shell hole 2-11-1. The upper shell is also provided with a battery seat 2-13 and a hook 2-14. The battery is installed in the battery seat. The lock hole and the elastic contact are arranged on the bottom surface of the lower shell.

[0053] The linkage mechanism includes a push rod 4-1, a push rod spring 4-2, a lock core, a lock block 4-3, and a lock block spring 4-4. The lock block and push rod are slidably positioned within the housing. The push rod spring is used to reset the push rod, and the lock block spring is used to push the lock block against the push rod. Movement of the push rod drives the lock block forward. The lock block has a lock hook 4-3-1 for engaging a latch inserted into the lock hole. The lock core is used to secure the push rod to prevent movement (keeping the anti-theft tag locked).

[0054] The sliding direction of the locking block is Figure 4 The sliding direction of the push rod is Figure 6 The locking block slides in a horizontal direction, and the sliding direction of the push rod is perpendicular to each other. One end of the push rod extends out of the housing through the upper housing hole (to facilitate finger pressing), and a sloped surface 4-1-1 is provided on the side of the push rod. One end of the locking block is a triangular contact end 4-3-2 (which supports the sloped surface of the push rod), and the other end is provided with the locking hook. The locking block also has a cavity 4-3-3 in it for accommodating the locking block spring.

[0055] When the push rod moves ( Figures 8 and 9The lock block is pressed against the inclined surface (the lock hook engages the latch) to move it away from the push rod (the lock hook engages the latch), and the push rod simultaneously contacts the switch, activating the alarm. When the push rod moves in the opposite direction, the lock block spring pushes the lock block toward the push rod (the lock hook disengages the latch), and the push rod disengages the switch, deactivating the alarm. Simultaneously, the operating status of the security tag is indicated by a flashing indicator light and a sounding buzzer.

[0056] The number of the locking blocks is determined according to the needs, and can be one, two, three, four, or even more. Figure 8 and Figure 9 As shown, there are four locking blocks, two on each side of the push rod. The locking blocks on the same side are connected as a whole to facilitate synchronous movement. The bottom surface of the housing is provided with four locking holes corresponding to the positions of the locking blocks. Correspondingly, there are four inclined surfaces on both sides of the push rod.

[0057] The lock core includes a lock head 4-5, a lock head spring 4-6, and a lock head hole 4-1-2. The lock head is slidably positioned in the upper shell of the housing. The sliding direction of the lock head ( Figure 4 The vertical direction of the lock head is perpendicular to the sliding direction of the lock hook and the sliding direction of the push rod. The lock head spring is used to push the lock head to move toward the push rod. The lock head hole is made on the push rod. The front end of the lock head can be inserted into the lock head hole to prevent the push rod from moving, so that the anti-theft tag remains locked.

[0058] 2. Protective bag

[0059] The protective bag is a cylindrical bag body with a base 3 on the bag opening. The anti-theft tag can be installed on the base and lock the bag opening of the protective bag. The shape of the protective bag is a rectangular parallelepiped or a cylinder, which is suitable for the shape of alcoholic products.

[0060] like Figure 13 and Figure 14 As shown, the protective bag has a rectangular shape. The bag opening is equipped with two symmetrically arranged top covers 1-1 and two symmetrically arranged side covers 1-2. The bottom of the bag is equipped with four bottom covers (omitted in the figure). Each top cover has a base, and each side cover has a buckle 5. The top covers can be fixed together by the plug-in structure of the base. The side covers can be fixed together by buckles. The bottom covers are fixed together by welding to seal the bottom of the bag.

[0061] like Figure 16 and Figure 17 As shown, the protective bag has a cylindrical shape. The bag opening is equipped with two top covers 1-1 and several side covers (omitted in the figure). The bottom of the bag is equipped with several bottom covers (omitted in the figure). Each top cover has a base, and each side cover has a buckle 5. The top covers can be fixed together by the plug-in structure of the base. The side covers can be fixed together by buckles. The bottom covers are fixed together by welding to seal the bottom of the bag.

[0062] The protective bag is made of a laminated conductive film.

[0063] The laminated conductive film has a three-layer structure, including an inner layer, a mesh-shaped metal layer, and an outer layer, arranged in sequence. The inner layer is a PET film, a PE film, or a CPP film. The outer layer is a PET film, a PE film, or a CPP film. The metal layer is an aluminum foil layer.

[0064] The conductive laminated film may also have a four-layer structure, including a first inner layer, a second inner layer, a mesh metal layer, and an outer layer, arranged in sequence. The first inner layer is a PET film, a PE film, or a CPP film. The second inner layer is a PET film, a PE film, or a CPP film. The outer layer is a PET film, a PE film, or a CPP film. The metal layer is an aluminum foil layer.

[0065] The preferred structure of the laminated conductive film is as follows: the first inner layer is a CPP film with a thickness of 0.045 mm, which provides low-temperature resistance and high transparency. The second inner layer is a PET film with a thickness of 0.038 mm. The metal layer is an aluminum foil layer with a thickness of 0.03 mm. The outer layer is a CPP film with a thickness of 0.045 mm, which provides low-temperature resistance and high transparency.

[0066] The metal layer, which serves as the protective bag's alarm circuit 6, includes an input terminal 6-1, an output terminal 6-2, and a mesh wiring pattern connecting the input and output terminals. The nodes of the mesh wiring are arranged in a winding, maze-like pattern to create a confusing effect. The input and output terminals have a certain area to ensure that the elastic contacts of the security tag can accurately contact each other.

[0067] The surface of the conductive film is also provided with a hollowed-out area (omitted in the figure), where the input and output terminals are located, ensuring that they are exposed and unobstructed. Therefore, the elastic contacts of the anti-theft tag can extend through the socket into the base, respectively supporting the input and output terminals, thereby connecting the circuit board to the alarm circuit. The hollowed-out area is usually formed on the outer layer of the conductive film.

[0068] The input end and the output end are arranged on the top cover. The input end and the output end can be arranged on the same top cover, or the input end and the output end are arranged on two top covers respectively.

[0069] For a protective bag with a rectangular shape, its unfolding structure is as follows: Figure 15As shown, the top edge of the conductive film is provided with two top covers 1-1 and two side covers 1-2, and the bottom edge is provided with four bottom covers 1-3. The two sides of the conductive film are welded together to form a circumferentially closed protective bag, and the four bottom covers are also welded together to form a closed bottom surface. To close the bag, the two side covers are first folded inward and secured with clips. The two top covers are then folded inward and secured horizontally between the bases using a plug-in structure. The input and output terminals of the alarm circuit are located on the same top cover, as is the hollowed-out area.

[0070] For a cylindrical protective bag, its unfolding structure is as follows: Figure 18 As shown, the top edge of the conductive film is provided with two top covers 1-1 and three side covers 1-2 (one larger side cover and two smaller side covers). The top cover is semicircular, and the bottom edge is provided with two bottom covers 1-3 and seven auxiliary bottom covers 1-4. The bottom covers are semicircular, and the auxiliary bottom covers are smaller than the bottom cover. The two side edges of the conductive film are fixed by welding to close the protective bag circumferentially. The bottom cover and the auxiliary bottom covers are also fixed by welding to close the bottom surface of the protective bag. To close the bag, first fold the three side covers inward and secure them up and down with buckles (the two smaller side covers are also secured to the larger side covers). Then, fold the two top covers inward and secure them horizontally between the bases using a plug-in structure. The input and output of the alarm circuit are provided on the same top cover, and the hollow area is also provided on this top cover.

[0071] When making the protective bag, the areas to be welded on the conductive film are overlapped and then welded. The conductive film in the welded area is first melted by heat and then solidified by cooling, forming a single piece. Welding also allows the mesh traces in the overlapping areas to connect and conduct.

[0072] The base is fixed on the top cover, and the base covers the input and output ends of the alarm circuit. The base is provided with a jack 3-1 and a pin 3-2. Figure 19 and Figure 20 As shown, each base is provided with two latches, each of which is provided with a latch 3-2-1 that matches the lock hook. One of the bases is provided with two sockets, through which elastic contacts can be inserted into the base, respectively supporting the input and output terminals, so that the circuit board is connected to the alarm circuit.

[0073] The two bases can be fixed via a plug-in structure so that the top cover covers the bag opening of the protective bag (the top cover and the side cover cover the bag opening in the horizontal direction and the vertical direction respectively).

[0074] like Figure 19 and Figure 20As shown, in the plug-in structure, one base is provided with a first upper plug-in board 3.11 (with plug hooks) and two first lower plug-in boards 3.12 (with slots), and the other base is provided with a second lower plug-in board 3.22 (with slots) and two second upper plug-in boards 3.21 (with plug hooks).

[0075] When plugging, apply a certain amount of pressure to the two bases, the hook of the first upper plug plate is inserted into the slot of the second lower plug plate, and the hook of the second upper plug plate is inserted into the slot of the first lower plug plate, and the two bases are fixed. As long as a certain amount of pulling force is applied, the hook can be disengaged from the slot and the two bases can be separated. The plugging direction of the two bases ( Figure 6 The horizontal direction of the lock block) and the moving direction of the lock block ( Figure 4 horizontal direction) vertically so that the base cannot be accidentally opened when locked.

[0076] like Figure 21 As shown, the base is composed of an upper baffle 3.3 and a lower baffle 3.4, which clamp the laminated conductive film from both sides. The lower baffle is provided with a plurality of connecting columns 3.5, which pass through the connecting holes 1-9 on the laminated conductive film and are fixed to the upper baffle on the other side. The lower baffle is also provided with the said pin, which passes through the connecting holes 1-9 on the laminated conductive film and the upper baffle on the other side.

[0077] The working principle of the present invention is as follows:

[0078] 1. Packaging

[0079] Place the product in the rectangular protective bag, close the two side covers and secure them with buckles, close the two top covers and insert the base to secure it, and completely close the bag opening.

[0080] 2. Lock

[0081] Install the anti-theft tag on the base, make sure the installation direction of the anti-theft tag is correct, insert the pin into the keyhole, press the push rod, when the push rod moves, it not only triggers the switch to power on the circuit board, but also pushes the lock blocks on both sides to move backwards, so that the lock hooks are respectively locked into the bayonet holes of each pin. At the same time, the lock core is inserted into the lock head hole to fix the push rod. The elastic contact extends into the base and presses against the input terminal to connect the circuit board with the alarm circuit, and the anti-theft monitoring begins;

[0082] Since the alarm circuit is a complete conductor connecting the input and output ends, when the protective bag is damaged, the resistance of the alarm circuit will change or short-circuit, and the anti-theft tag will sound an alarm to alert the staff; the alarm will not be triggered unless the alarm tag is unlocked normally using a magnetic unlocker.

[0083] 3. Unlock

[0084] Place the unlocking tool in the lock core position. The lock head will be separated from the push rod by the magnetic force. The push rod and the lock block will be reset one after another (one end of the push rod pops outward), and the latch will be released. At this time, the anti-theft label can be removed from the protective bag.

[0085] The device has triple alarm functions:

[0086] 1. When an unopened item is passed by the antenna at the entrance of a shopping mall, the mall alarm system will sound an alarm.

[0087] 2. When an unopened item passes the antenna at the entrance of a shopping mall, the anti-theft tag will sound an alarm;

[0088] 3. If the unlocked protective bag is forcibly opened, the bag body is damaged or the elastic contacts are loose, and the anti-theft tag sounds an alarm.

[0089] The accompanying drawings show preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

Claims

1. A three-dimensional protective bag anti-theft device, comprising a protective bag (1) and an anti-theft label (2); characterized in that: The protective bag comprises a cylindrical bag body made of a laminated conductive film with a built-in alarm circuit (6); a base (3) with a latch (3-2) is arranged at the bag opening of the protective bag; the input end and the output end of the alarm circuit are located in the base; the anti-theft tag is provided with a lock hole (2-1), an elastic contact (2-2), a linkage mechanism, and a circuit board (2-3); When locking, the latch is inserted into the keyhole, the linkage mechanism locks the latch, the anti-theft tag is fixed to the base and locks the bag opening of the protective bag, and the elastic contacts press against the input and output terminals to connect the circuit board to the alarm circuit; when unlocking, the linkage mechanism releases the latch, and the anti-theft tag is separated from the base to open the bag opening; The linkage mechanism comprises a push rod (4-1), a push rod spring (4-2) for resetting the push rod, a lock core for fixing the push rod, a lock block (4-3), and a lock block spring (4-4) for causing the lock block to press against the push rod. When locking, insert the bolt into the keyhole and press the push rod. The push rod pushes the lock block to lock the bolt, and the lock core locks the push rod at the same time. When unlocking, the lock core releases the push rod, and the push rod resets to make the lock block disengage from the bolt, and the bolt can be pulled out of the keyhole. The locking block and the push rod are slidably positioned in the housing of the anti-theft tag, the sliding directions of the locking block and the push rod are perpendicular to each other, and the push rod is provided with an inclined surface (4-1-1) for pushing the locking block; the locking hole and the elastic contact are arranged on the bottom surface of the housing.

2. The three-dimensional protective bag anti-theft device according to claim 1, characterized in that: The lock core comprises a lock head (4-5) slidably positioned in the housing, a lock head spring (4-6) for pushing the lock head, and a lock head hole (4-1-2) formed on the push rod and matching the lock head.

3. The three-dimensional protective bag anti-theft device according to claim 2, characterized in that: Two locking blocks are arranged on each side of the push rod, and the locking blocks on the same side are connected as a whole. Four locking holes are formed on the bottom surface of the shell; one end of the locking block supports the push rod and the other end is provided with a locking hook (4-3-1).

4. The three-dimensional protective bag anti-theft device according to claim 3, characterized in that: The anti-theft tag also includes a coil (2-4), a buzzer (2-5), and a battery (2-6).

5. The three-dimensional protective bag anti-theft device according to any one of claims 1 to 4, characterized in that: The protective bag has a rectangular or cylindrical shape, and the bag opening of the protective bag is provided with two top covers (1-1), each top cover is installed with a base, and the bases are fixed by a plug-in structure so that the top covers cover the bag opening of the protective bag; the input end and the output end are arranged on the top covers; and the base is provided with a socket (3-1) for the elastic contact to extend into.

6. The three-dimensional protective bag anti-theft device according to claim 5, characterized in that: The protective bag has a rectangular shape, and the bag opening of the protective bag is provided with two top covers and two side covers (1-2), and the side covers are fixed by buckles (5); the bag bottom of the protective bag is provided with four bottom covers (1-3), and the bottom covers are fixed by welding, and each base is provided with two latches.

7. The three-dimensional protective bag anti-theft device according to claim 5, characterized in that: The protective bag has a cylindrical shape, and the bag opening of the protective bag is provided with two top covers and at least two side covers (1-2), and the side covers are fixed by buckles (5); the bag bottom of the protective bag is provided with two bottom covers (1-3) and at least two auxiliary bottom covers (1-4), and the bottom covers and the auxiliary bottom covers are fixed by welding, and each base is provided with two latches.

8. The three-dimensional protective bag anti-theft device according to claim 6 or 7, characterized in that: The plugging direction of the base is perpendicular to the sliding direction of the locking block; the laminated conductive film includes an inner layer, a mesh metal layer serving as an alarm circuit, and an outer layer, or the laminated conductive film includes a first inner layer, a second inner layer, a mesh metal layer serving as an alarm circuit, and an outer layer.

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