A distribution box with good safety

Abstract

The application provides a power distribution box with good safety, relates to the technical field of power distribution boxes, and discloses a charging mechanism which is composed of a control pipe installed on a cabinet door and an intermediate sleeve, a guide rod, an intermediate disc, a reset spring, a magnetic rod, a push spring, and a separable external component, i.e., an intermediate pipe, a magnetic ring, a piston disc, a piston pipe, a handle, a top sleeve, and a top disc, which are arranged in the control pipe, and realizes one-way charging of the air bag only when the external component is inserted and automatic closure of the air path after the external component is pulled out. The unlocking mechanism is composed of an unlocking rod, a guide sleeve, and a top spring which are arranged in the top disc, and realizes active opening of the exhaust passage only when the external component is inserted to release the gas in the air bag. The power distribution box is additionally provided with a pressure-driven additional locking barrier which needs to be operated by a special tool in addition to a conventional lock body, effectively prevents unauthorized personnel from opening the cabinet door by using a general key or by force, and significantly improves the physical safety and the authority control ability of the power distribution box.

Description

Technical Field

[0001] This invention relates to the field of distribution box technology, and more specifically, to a distribution box with good safety. Background Technology

[0002] In existing technologies, distribution boxes widely deployed in outdoor or industrial environments typically rely solely on traditional mechanical locks as their only physical security barrier. These locks are mostly common pin tumbler locks or leaf locks available on the market. Their lock cylinder structure and key tooth design are relatively fixed and lack sufficient differentiation in security levels. This results in a high rate of mutual opening between locks from different batches or even different manufacturers. More seriously, the matching keys for these common locks can be easily purchased or copied through ordinary hardware channels. This allows unauthorized personnel to easily open the door without damaging the lock body and directly access the internal precision electrical components and high-voltage lines, posing an extremely serious security hazard.

[0003] The security vulnerabilities introduced by the aforementioned universal locks can lead to a number of serious consequences in actual operation. On the one hand, they provide opportunities for malicious acts of vandalism, allowing criminals to easily enter distribution boxes to steal, tamper with wiring, or throw foreign objects, directly threatening the stable operation of the power system and public safety. On the other hand, for power maintenance departments that require strict access control, universal locks cannot provide an effective operation traceability and hierarchical authorization mechanism. The loss or duplication of keys is difficult to detect and control in a timely manner, leading to the risk of misoperation or unauthorized access to equipment inside the box. At the same time, the frequent unauthorized opening incidents also bring great trouble and uncertainty to the asset management of power facilities, the determination of accident liability, and daily inspection and maintenance work. Summary of the Invention

[0004] (a) Technical problems to be solved In view of the problems existing in the prior art, the present invention provides a distribution box with good safety to solve the technical problems mentioned in the background art.

[0005] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: a distribution box with good security, comprising a fixedly installed cabinet and a cabinet door rotatably connected to the cabinet, a lock body installed on the cabinet door, and a sealing frame installed inside the cabinet; it also includes a locking mechanism, an inflation mechanism, and an unlocking mechanism; The locking mechanism forms a double lock on the cabinet by unfolding its internal structure when inflated, thereby adding a physical locking barrier in addition to the conventional lock body. When not inflated, the unfolded structure automatically retracts by resetting the internal elastic element to release the additional lock and restore the cabinet to its initial state where it is locked only by the conventional lock body. The inflation mechanism only allows gas to be unidirectionally injected into the locking mechanism after a matching external component is connected, thereby driving the internal structure to unfold to achieve additional locking. After the external component is pulled out, the inflation channel is automatically closed to prevent unauthorized gas release and maintain the locked state. The unlocking mechanism only actively opens the exhaust channel to release the gas inside the locking mechanism after a matching external component is connected, thereby releasing the unfolded state of the internal structure to unlock the additional lock and restore it to the initial state where it is locked only by the conventional lock body.

[0006] Preferably, the locking mechanism includes an airbag embedded in the side wall of the cabinet door, the airbag being attached to the sealing frame, a semi-circular block being provided inside the airbag, two sets of folding blocks being symmetrically arranged at both ends of the semi-circular block, a rotating shaft being installed on the side wall of each folding block, the rotation being rotatably connected inside the semi-circular block, and rounded corners being provided on the semi-circular block, so that when the multiple folding blocks are in the open state, one side of the rounded corner abuts against the inner wall of the airbag.

[0007] Preferably, each of the folding blocks has an embedded groove, and each embedded groove is equipped with a follower rod. Two sets of follower rods are rotatably connected to a synchronization plate, and a bidirectional spring is provided on the side of the two synchronization plates that are close to each other.

[0008] Preferably, each of the synchronizing rods has a circular hole, and a push rod is hinged in the circular hole. The other end of the push rod is rotatably connected to a tail tube, and a rubber sleeve is installed on the tail tube. The rubber sleeve is sealed and fitted inside the airbag.

[0009] Preferably, the inflation mechanism includes a control tube installed on the cabinet door, the lower end of the control tube being connected to the airbag, an intermediate sleeve installed inside the control tube, and a bottom groove formed inside the intermediate sleeve. A guide rod is slidably connected inside the control tube, an intermediate plate is installed at the upper end of the guide rod, the intermediate plate is fitted into the bottom groove, and a return spring is installed at the lower end of the intermediate plate, the return spring abutting against the inside of the control tube.

[0010] Preferably, the upper surface of the intermediate sleeve is provided with multiple transverse grooves at equal intervals, and a magnetic rod is slidably connected in each transverse groove. A lateral groove is provided on the outer wall of the intermediate disk. One end of the magnetic rod is inserted into the lateral groove, and a push spring is installed at the other end of the magnetic rod. The push spring abuts against the inner wall of the control tube.

[0011] Preferably, the inflation mechanism further includes an external component, which includes an intermediate tube that is sealed and slidably connected within the control tube. A magnetic ring is installed at the lower end of the intermediate tube, and a stop groove is coaxially formed on the intermediate sleeve, with the magnetic ring fitting into the stop groove.

[0012] Preferably, a piston disc is slidably connected inside the intermediate tube, a piston tube is coaxially arranged on the piston disc, a limit disc is installed on the intermediate tube, and a handle is installed on the piston tube.

[0013] Preferably, a top sleeve is coaxially disposed inside the piston tube, a top groove is formed inside the top sleeve, and a top plate is fitted into the top groove.

[0014] Preferably, the release mechanism includes a release rod coaxially mounted in the top plate, a guide sleeve mounted on the outer wall of the release rod, the guide sleeve being slidably connected in the piston tube, and a top spring provided at the lower end of the guide sleeve, the top spring abutting against the top sleeve.

[0015] (III) Beneficial Effects Compared with the prior art, the present invention provides a distribution box with good security and has the following beneficial effects: This invention, through an innovative pneumatically driven locking mechanism, constructs an additional physical locking barrier outside the conventional mechanical lock body, requiring specialized tools to operate. This fundamentally solves the security vulnerabilities caused by traditional distribution boxes relying solely on general-purpose locks. The airbag in the locking mechanism remains flexible in its uninflated state to allow the cabinet door to close normally. When authorized personnel inflate the airbag using a dedicated external component, the inflated airbag first compresses the sealing frame and the cabinet door to form an airtight seal. As the air pressure rises to a threshold, multiple sets of folding blocks inside the airbag simultaneously flip outwards and unfold under the combined action of air pressure and internal linkage mechanisms. The protruding areas they support lock into the inner side of the sealing frame, forming a mechanical block. At this point, even if unauthorized personnel use a conventional key to open the lock body, the cabinet door cannot be opened due to the physical locking effect of the folding blocks. This composite design of pneumatic drive and mechanical locking binds opening authority to a dedicated inflation tool, making it completely impossible for unauthorized personnel to unlock the lock using conventional means.

[0016] The inflation mechanism constructed in this invention achieves physical isolation and precise control of inflation permissions through the cooperation of a magnetically controlled one-way valve and a dedicated external component. The intermediate disc inside the control tube is normally kept in a sealed fit with the bottom groove under the action of a reset spring. Simultaneously, multiple magnetic rods are inserted into the lateral grooves of the intermediate disc under the action of push springs, locking it in a sealed position, keeping the air passage normally closed. Only when the intermediate tube of the dedicated external component is inserted into the control tube and the lower magnetic ring is fitted with the intermediate sleeve can the magnetic field generated by the magnetic ring overcome the spring force of the push spring and pull the magnetic rods outward, thus releasing the lock on the intermediate disc. At this point, the operator can repeatedly push and pull the piston tube of the external component to inflate the airbag. After inflation is complete, pulling out the external component causes the magnetic rods to automatically reset and relock the intermediate disc, permanently sealing the air passage until the next insertion of the dedicated tool. This design ensures that even if unauthorized personnel know the principle, they cannot deflate and unlock the device using simple tools, providing reliable physical-layer access control for the distribution box.

[0017] The unlocking mechanism and inflation mechanism of this invention share the same dedicated external component. Deflating and unlocking can be achieved with a simple pushing action, further enhancing operational convenience and ensuring the uniqueness of authorization. When authorized personnel need to unlock the additional lock, they simply insert the external component back into the control tube to release the magnetic ring from the middle plate. Then, they can push the unlocking lever at the top of the external component with their fingers. Its lower end first opens the top plate, releasing the seal inside the piston tube. Continuing to push further will press against the middle plate, causing it to disengage from the bottom groove. The gas inside the airbag is then discharged through the control tube and piston tube. After the airbag is depressurized, its internal folding block automatically folds back under the action of a bidirectional spring, releasing the physical lock. The cabinet door returns to its normal state, locked only by the lock body. The entire unlocking process is smooth, fast, and requires no additional tools. Furthermore, since the operation of the unlocking lever also requires the insertion of the external component, strict consistency between deflation and inflation permissions is ensured.

[0018] This invention achieves a flexible balance between dual protection and emergency operation by completely decoupling the additional locking function from the conventional lock body. In daily operation, maintenance personnel can perform inspection operations using only a conventional key without activating the pneumatic lock. When enhanced security is required, such as when the equipment is in a high-risk environment or is out of service for an extended period, the pneumatic lock can be activated. Authorized personnel can quickly complete the inflation and deflation unlocking using a dedicated external component. Furthermore, even in extreme cases where the conventional lock body is opened or damaged without authorization, the pneumatic lock mechanism can still independently maintain the cabinet door closed, providing backup security for electrical equipment in emergency situations. This modular and switchable dual locking solution not only meets the security needs of different scenarios but also avoids the overall security collapse caused by the failure of a single protection mechanism, significantly improving the environmental adaptability and risk resistance of the distribution box. Attached Figure Description

[0019] Figure 1This is a schematic diagram of the overall structure of a power distribution box with good safety in this invention; Figure 2 This is a schematic diagram of the cabinet door and airbag in this invention; Figure 3 This is a schematic diagram of the airbag and control tube structure in this invention; Figure 4 This is a partial enlarged view of A in this invention; Figure 5 This is a schematic diagram of the semicircular block in this invention; Figure 6 This is a cross-sectional view of the semicircular block in this invention. Figure 7 This is an exploded view of the folding block and the synchronization plate in this invention; Figure 8 This is a schematic diagram of the control tube structure in this invention; Figure 9 In this invention Figure 8 A schematic diagram of the cross-sectional structure; Figure 10 This is a cross-sectional view of the control tube in this invention; Figure 11 This is a cross-sectional view of the external component in this invention.

[0020] In the diagram: 11. Cabinet body; 12. Cabinet door; 13. Lock body; 14. Sealing frame; 21. Locking mechanism; 22. Airbag; 23. Semicircular block; 24. Folding block; 25. Rotating shaft; 26. Rounded corner; 27. Embedded groove; 28. Follower rod; 29. ​​Synchronizing plate; 31. Inflation mechanism; 32. Control tube; 33. Intermediate sleeve; 34. Bottom groove; 35. Guide rod; 36. Intermediate plate; 37. Return spring; 38. Horizontal groove; 39. Magnetic rod; 41. Outer 42. Connecting component; 43. Intermediate tube; 44. Magnetic ring; 45. Stop groove; 46. Piston disc; 47. Piston tube; 48. Limiting disc; 49. Handle; 50. Top sleeve; 51. Unlocking mechanism; 52. Unlocking rod; 53. Guide sleeve; 54. Top spring; 210. Double-acting spring; 211. Round hole; 212. Push rod; 213. Tail tube; 214. Rubber sleeve; 310. Side groove; 311. Push spring; 410. Top groove; 411. Top disc. Detailed Implementation

[0021] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0022] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0023] In this invention, unless otherwise stated, the directional terms such as "up" and "down" generally refer to the directions shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" generally refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0024] Please see Figures 1 to 11 This embodiment provides a high-security distribution box, which aims to solve the technical problems of insufficient security and easy copying or mutual opening of keys caused by the reliance on general mechanical locks in existing distribution boxes. By integrating a locking system based on pneumatic drive and magnetic authorization, an additional locking barrier that requires special tools to operate is added in addition to the conventional lock body, realizing dual control and physical isolation of the door opening permission, and significantly improving the distribution box's ability to prevent unauthorized opening.

[0025] 1. Overall structure and initial state The secure distribution box includes a fixed cabinet 11 and a cabinet door 12 connected to the opening side of the cabinet 11 by a hinge. A conventional lock body 13 is installed on the cabinet door 12 for basic locking. An annular sealing frame 14 is fixedly installed at the inner port of the cabinet 11. It also includes a locking mechanism 21, an inflation mechanism 31, and an unlocking mechanism 51 installed between the cabinet door 12 and the cabinet 11. The locking mechanism 21 is used to expand and unfold through the internal structure to form an additional lock on the cabinet 11 when inflated. The inflation mechanism 31 is used to unidirectionally inflate the locking mechanism 21 to drive it to unfold after a dedicated external component is connected. The unlocking mechanism 51 is used to actively release the gas in the locking mechanism 21 to release the additional lock after a dedicated external component is connected.

[0026] 2. Composition of the core system 2.1 Locking mechanism 21 The locking mechanism 21 is the core unit for adding a physical locking barrier to the conventional lock body 13. It includes an annular airbag 22 embedded in the side wall of the cabinet door 12. When the cabinet door 12 is closed, the airbag 22 is directly opposite and fits against the sealing frame 14 on the cabinet body 11. A semi-circular block 23 is provided inside the airbag 22. Two sets of rotatable folding blocks 24 are symmetrically arranged at both ends of the semi-circular block 23. Each folding block 24 is rotatably connected to the semi-circular block 23 through a pivot 25 fixed to its side wall. The side wall of the semi-circular block 23 is provided with rounded corners 26 corresponding to the rotation trajectory of the folding blocks 24. When multiple folding blocks 24 are in a supporting position... When in the open state, one side of the rounded corner 26 abuts against the inner wall of the airbag 22. Each folding block 24 has an embedded groove 27 and a follower rod 28 is fixedly installed in each embedded groove 27. The two sets of follower rods 28 are rotatably connected to a synchronization plate 29, and a bidirectional spring 210 is provided between the two synchronization plates 29 on their close sides. Each follower rod 28 also has a round hole 211 and a push rod 212 is hinged in the round hole 211. The other end of the push rod 212 is rotatably connected to a tail tube 213. A rubber sleeve 214 is fixedly fitted on the tail tube 213 and the outer edge of the rubber sleeve 214 is sealed and fitted against the inner wall of the airbag 22.

[0027] 2.2 Inflatable Mechanism 31 The inflation mechanism 31 is the core unit used to inflate the locking mechanism 21 to drive its deployment and maintain its locked state. It includes a control tube 32 fixedly installed on the cabinet door 12. The lower end of the control tube 32 communicates with the interior of the airbag 22. An intermediate sleeve 33 is fixedly installed inside the control tube 32, and a bottom groove 34 is formed inside the intermediate sleeve 33. A guide rod 35 is slidably connected inside the control tube 32. An intermediate plate 36 is fixedly installed at the upper end of the guide rod 35 and can be sealed and fitted inside the bottom groove 34. A return spring 37 is sleeved between the lower end of the intermediate plate 36 and the guide rod 35, and the lower end of the return spring 37 abuts against the inner wall of the control tube 32. Multiple transverse grooves 38 are evenly spaced along the circumference on the upper surface of the intermediate sleeve 33. A magnetic rod 39 is slidably connected in each transverse groove 38. A lateral groove 310 corresponding to the magnetic rod 39 is formed on the outer wall of the intermediate plate 36, and the inner end of the magnetic rod 39 can be inserted into the lateral groove 310. Inside, a push spring 311 is provided between the outer end of the magnetic rod 39 and the transverse groove 38, and the two ends of the push spring 311 abut against the inner walls of the magnetic rod 39 and the control tube 32 respectively. The inflation mechanism 31 also includes a separable external component 41. The external component 41 includes a middle tube 42 that can be sealed and slidably inserted into the control tube 32. A magnetic ring 43 is fixedly installed at the lower end of the middle tube 42. A stop groove 44 that can fit with the magnetic ring 43 is opened coaxially on the upper end face of the middle sleeve 33. A piston disc 45 is sealed and slidably connected inside the middle tube 42. A piston tube 46 is fixed coaxially at the upper end of the piston disc 45 and the upper end of the piston tube 46 extends out of the middle tube 42. A limit plate 47 is fixedly installed at the upper end of the middle tube 42. A handle 48 is fixedly installed at the upper end of the piston tube 46. A top sleeve 49 is fixed coaxially inside the piston tube 46 and a top groove 410 is opened inside the top sleeve 49. A top plate 411 is sealed and fitted inside the top groove 410.

[0028] 2.3 Unlocking Mechanism 51 The unlocking mechanism 51 is a core unit used to actively release the gas inside the locking mechanism 21 to release the additional lock. It is integrated inside the piston tube 46 of the external component 41 and includes an unlocking rod 52 coaxially mounted in the top plate 411. The lower end of the unlocking rod 52 can pass through the top plate 411 and extend out. A guide sleeve 53 is fixedly installed on the outer wall of the unlocking rod 52 and the guide sleeve 53 is slidably connected to the inner wall of the piston tube 46. A top spring 54 is provided between the lower end of the guide sleeve 53 and the top sleeve 49, and the two ends of the top spring 54 abut against the guide sleeve 53 and the top sleeve 49 respectively.

[0029] 3. Working process and principle of the device The complete workflow of the high-security distribution box from regular locking to additional locking and then to unlocking is as follows: In the initial state, the cabinet door 12 is in the closed position. The operator uses the regular key to operate the lock body 13 to achieve basic locking. At this time, the airbag 22 is in an uninflated state. The folding block 24 inside it is kept in a folded state under the tension of the double-acting spring 210 and stored in the semi-circular block 23. The rubber sleeve 214 is also in a relaxed state. The airbag 22 is soft and can fit against the sealing frame 14 without generating additional locking force.

[0030] When additional locking is required, the operator inserts the intermediate tube 42 of the dedicated external component 41 into the control tube 32 on the cabinet door 12. The intermediate tube 42 slides downward until the magnetic ring 43 at its lower end is in contact with the stop groove 44 on the intermediate sleeve 33. At this time, the magnetic field generated by the magnetic ring 43 exerts a magnetic attraction force on the multiple magnetic rods 39 in the control tube 32, overcoming the elastic force of the push spring 311 and pulling the magnetic rods 39 outward so that their inner ends completely exit from the lateral groove 310 of the intermediate plate 36, thereby releasing the radial locking of the intermediate plate 36. At this time, the intermediate plate 36 can move freely along the axial direction under the guidance of the guide rod 35. The operator presses the limit plate 47 with one hand to ensure that the intermediate tube 42 and the control tube 32 remain in a sealed fit, and holds the handle 48 with the other hand and pushes and pulls the piston tube 46 back and forth. When the handle 48 is pushed downward, Piston disc 45 slides downwards within intermediate tube 42, compressing the lower air. The gas pressure pushes intermediate disc 36 downwards, overcoming the elastic force of return spring 37, causing it to disengage from the seal with bottom groove 34. Gas enters airbag 22 through control tube 32. At this time, the air pressure inside airbag 22 acts upwards on top disc 411, keeping it sealed with top groove 410. Gas cannot escape from piston tube 46, completing one inflation cycle. When handle 48 is pulled upwards, piston disc 45 moves upwards, creating negative pressure within intermediate tube 42. Under the action of return spring 37, intermediate disc 36 resets upwards, resealing with bottom groove 34. External air is drawn into piston tube 46 through the gap between top disc 411 and top groove 410. By repeatedly pushing and pulling handle 48, gas is pumped into airbag 22, gradually inflating it.

[0031] As the air pressure inside the airbag 22 increases, the airbag 22 first expands outward and squeezes between the sealing frame 14 and the cabinet door 12, forming an airtight seal. When the air pressure further increases to the threshold, the inner wall of the airbag 22 pushes the rubber sleeves 214 on both sides to bring them closer together. The rubber sleeves 214 push the follower rod 28 and the synchronization plate 29 through the tail tube 213 and the push rod 212. Under the synergistic action of the bidirectional spring 210, multiple folding blocks 24 rotate outward synchronously around the pivot 25 until the outer edge of the folding block 24 abuts against the inner wall of the airbag 22 through the rounded corner 26 and supports a local area to form a protruding structure. These protruding structures are locked into the inner side of the sealing frame 14, thus forming a physical lock outside the airtight seal. At this time, even if the lock body 13 is opened with a conventional key, the cabinet door 12 cannot be opened due to the mechanical blocking effect of the folding blocks 24, thus achieving double locking.

[0032] After inflation is complete, the operator pulls out the external component 41 as a whole. After the magnetic ring 43 moves away, the magnetic rod 39 loses its magnetic attraction and is reset and reinserted into the side groove 310 of the middle plate 36 under the action of the push spring 311. The middle plate 36 is locked in the current position and kept in a sealed fit with the bottom groove 34. At this time, the gas in the airbag 22 is sealed and cannot be discharged. The additional locking state is maintained, and unauthorized personnel cannot deflate or unlock the airbag even if they have a regular key.

[0033] When authorized personnel need to unlock, they insert the external component 41 back into the control tube 32 to re-attract the magnetic ring 43 to the magnetic rod 39, releasing the lock on the intermediate plate 36. Then, they push the unlocking rod 52 with their fingers to move it downwards. The lower end of the unlocking rod 52 first pushes open the top plate 411, causing it to break away from the seal between it and the top groove 410. When pushed further, the lower end of the unlocking rod 52 presses against the intermediate plate 36, causing it to move downwards and break away from the seal between it and the bottom groove 34. The gas in the airbag 22 is discharged upwards through the control tube 32, the gap between the intermediate plate 36 and the bottom groove 34, and the channel in the piston tube 46. After the airbag 22 is depressurized, its internal folding block 24 automatically folds back into the semi-circular block 23 under the action of the bidirectional spring 210. The rubber sleeve 214 is reset, the physical lock is released, and the cabinet door 12 returns to its normal state where it is locked only by the lock body 13. The operator can then use a regular key to open the cabinet door 12.

[0034] Working principle summary: This invention uses the airbag 22 in the locking mechanism 21 to inflate and drive the folding block 24 to unfold, forming a physical lock. This provides an additional locking barrier beyond the conventional lock body 13. The magnetically controlled locking intermediate plate 36 in the inflation mechanism 31 ensures that only authorized personnel carrying the dedicated external component 41 can inflate or deflate the airbag 22. This binds the door opening permission to the dedicated tool, effectively preventing unauthorized personnel from opening the distribution box using conventional keys or violent methods, and significantly improving the physical security and access control capabilities of the distribution box.

[0035] Of all the solutions mentioned above, those involving the connection between two components can be selected according to the actual situation, such as welding, bolt and nut connection, bolt or screw connection, or other known connection methods, which will not be elaborated here. For all the fixed connections mentioned above, welding is preferred. Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-security distribution box, comprising a fixed cabinet (11) and a cabinet door (12) rotatably connected inside the cabinet (11), wherein a lock body (13) is installed on the cabinet door (12), and a sealing frame (14) is installed inside the cabinet (11); characterized in that: It also includes a locking mechanism (21), an inflation mechanism (31), and an unlocking mechanism (51); The locking mechanism (21) forms a double lock on the cabinet (11) by unfolding its internal structure when inflated, thereby adding a physical locking barrier in addition to the conventional lock body (13). When not inflated, the unfolding structure is automatically retracted by the reset of the internal elastic element to release the additional lock and restore the initial state where it is locked only by the conventional lock body (13). The inflation mechanism (31) only allows gas to be unidirectionally filled into the locking mechanism (21) after it is connected to a matching external component, thereby driving the internal structure to unfold to achieve additional locking, and automatically closing the inflation channel after the external component is pulled out to prevent unauthorized gas release, so that the locked state can be maintained. The unlocking mechanism (51) only actively opens the exhaust channel to release the gas in the locking mechanism (21) after it is connected to a matching external component, thereby releasing the unfolded state of the internal structure to unlock the additional lock and restore it to the initial state where it is locked only by the conventional lock body (13).

2. The distribution box with good security according to claim 1, characterized in that: The locking mechanism (21) includes an airbag (22) embedded in the side wall of the cabinet door (12). The airbag (22) is attached to the sealing frame (14). A semi-circular block (23) is provided inside the airbag (22). Two sets of folding blocks (24) are symmetrically arranged at both ends of the semi-circular block (23). A rotating shaft (25) is installed on the side wall of each folding block (24). The rotating shaft is rotatably connected to the semi-circular block (23). A rounded corner (26) is provided on the semi-circular block (23). When the multiple folding blocks (24) are in the open state, one side of the rounded corner (26) abuts against the inner wall of the airbag (22).

3. The distribution box with good security according to claim 2, characterized in that: Each of the folding blocks (24) has an embedded groove (27), and each embedded groove (27) is equipped with a follower rod (28). The two sets of follower rods (28) are rotatably connected to a synchronization plate (29), and a bidirectional spring (210) is provided on the side of the two synchronization plates (29) that are close to each other.

4. A distribution box with good security according to claim 3, characterized in that: Each of the synchronizing rods is provided with a circular hole (211), and a push rod (212) is hinged in the circular hole (211). The other end of the push rod (212) is rotatably connected to a tail tube (213), and a rubber sleeve (214) is installed on the tail tube (213). The rubber sleeve (214) is sealed and fitted inside the airbag (22).

5. A distribution box with good security according to claim 2, characterized in that: The inflation mechanism (31) includes a control tube (32) installed on the cabinet door (12). The lower end of the control tube (32) is connected to the airbag (22). An intermediate sleeve (33) is installed inside the control tube (32), and a bottom groove (34) is opened inside the intermediate sleeve (33). A guide rod (35) is slidably connected inside the control tube (32). An intermediate plate (36) is installed at the upper end of the guide rod (35). The intermediate plate (36) fits into the bottom groove (34). A reset spring (37) is installed at the lower end of the intermediate plate (36). The reset spring (37) abuts against the inside of the control tube (32).

6. A distribution box with good security according to claim 5, characterized in that: The upper surface of the intermediate sleeve (33) is provided with multiple transverse grooves (38) at equal intervals. Each transverse groove (38) is provided with a magnetic rod (39) that is slidably connected in a limiting manner. The outer wall of the intermediate disk (36) is provided with a lateral groove (310). One end of the magnetic rod (39) is inserted into the lateral groove (310). The other end of the magnetic rod (39) is provided with a push spring (311). The push spring (311) abuts against the inner wall of the control tube (32).

7. A distribution box with good security according to claim 6, characterized in that: The inflation mechanism (31) also includes an external component (41), which includes an intermediate tube (42) that is sealed and slidably connected in the control tube (32). A magnetic ring (43) is installed at the lower end of the intermediate tube (42). A stop groove (44) is coaxially provided on the intermediate sleeve (33), and the magnetic ring (43) fits into the stop groove (44).

8. A distribution box with good security according to claim 7, characterized in that: A piston disc (45) is slidably connected inside the intermediate tube (42), and a piston tube (46) is coaxially arranged on the piston disc (45). A limit disc (47) is installed on the intermediate tube (42), and a handle (48) is installed on the piston tube (46).

9. A distribution box with good security according to claim 8, characterized in that: A top sleeve (49) is coaxially arranged inside the piston tube (46), and a top groove (410) is opened inside the top sleeve (49). A top plate (411) is fitted inside the top groove (410).

10. A distribution box with good security according to claim 9, characterized in that: The release mechanism (51) includes a release rod (52) coaxially mounted in the top plate (411). A guide sleeve (53) is installed on the outer wall of the release rod (52). The guide sleeve (53) is slidably connected in the piston tube (46). A top spring (54) is provided at the lower end of the guide sleeve (53). The top spring (54) abuts against the top sleeve (49).

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