A power distribution meter box door anti-picking linkage locking device

Abstract

The present application relates to the technical field of distribution box, and discloses a kind of distribution metering box door anti-prying linkage locking device, including fixed plate body, the one side of fixed plate body is provided with the connecting plate body capable of relative translation, the inner wall of connecting plate body is provided with the bolt assembly for assisting the locking of connecting plate body and box when door lock structure is locked, adjusting assembly for controlling the locking state of bolt assembly and the translation of connecting plate body relative to fixed plate body is provided on fixed plate body, box and connecting plate body are respectively provided with control mechanism, for adjusting assembly is operated from outside;The present application is moved linearly by threaded drive slider, the locking and unlocking of bolt are controlled by connecting rod mechanism, when connecting rod intervenes and temporarily connects slider and connecting plate body, same rotation is forced to be converted into the translation of connecting plate body relative to fixed plate body, so as to force to separate lock tongue, the mechanical action of these two steps sequentially, anti-prying locking and non-destructive emergency opening after lock failure are realized.

Description

Technical Field

[0001] This invention relates to the field of distribution box technology, and specifically to an anti-pry linkage locking device for the door of a power distribution metering box. Background Technology

[0002] Currently, outdoor smart distribution boxes generally employ reinforced enclosures combined with high-security locks to prevent unauthorized entry. This design approach aims to resist forced entry by increasing the physical strength of a single lock. However, this approach contains an inherent technical contradiction that has become increasingly apparent in long-term practice:

[0003] There is an irreconcilable conflict between the anti-pry performance of locks and their maintainability after failure. Specifically, to prevent technical picking and forced entry, lock cylinders typically have complex anti-drilling and anti-torsion structures. When subjected to forced torsion exceeding their design thresholds, these structures' self-protection mechanisms can cause irreversible damage to internal core components, such as broken transmission plates, misaligned and jammed pins, or overall deformation of the lock cylinder. This damage, while successfully preventing unauthorized opening, also completely blocks the normal transmission path between the authorized key and the bolt. The direct consequence is that when electrical maintenance personnel face a distribution box with a damaged lock cylinder but a still-closed door, they are unable to open the door using any conventional means.

[0004] At this point, the only solution is often to use tools such as angle grinders and hydraulic shears to cut and damage the cabinet door or hinges. This destructive repair method is not only time-consuming and poses safety risks, but it also permanently damages the cabinet structure, reducing its protection level and making it difficult to reuse, significantly increasing maintenance costs and asset losses. Although some designs attempt to reserve emergency exits, such as adding exposed spare keyholes, this actually creates new attack vulnerabilities and reduces overall security. Some built-in complex emergency mechanisms often lack intuitive status indicators and robust mechanical pathways, making them prone to failure under harsh working conditions due to keyhole blockage or mechanism jamming, thus failing to guarantee the reliability of authorized opening.

[0005] Therefore, existing technologies have consistently failed to effectively solve a fundamental problem: how to provide authorized personnel with a concealed, reliable, and non-destructive emergency access route while ensuring that the distribution box can withstand attempts to break in, thereby achieving a balance between safety protection and efficient maintenance. Summary of the Invention

[0006] In view of the above-mentioned shortcomings of the existing technology, the present invention provides an anti-pry linkage locking device for power distribution metering box doors, which can effectively solve the problems existing in the prior art.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] This invention provides an anti-pry linkage locking device for a power distribution metering box door, comprising a box body, a box door body for opening and closing the box body on one side of the box body, a fixed plate body rotatably connected to the box body, a connecting plate body capable of relative translation on one side of the fixed plate body, a door lock structure for locking the connecting plate body to the box body on the connecting plate body, a pin assembly for assisting in locking the connecting plate body to the box body when the door lock structure is locked on the inner wall of the connecting plate body, an adjustment assembly for controlling the locking state of the pin assembly and the translation of the connecting plate body relative to the fixed plate body on the fixed plate body, and control mechanisms for operating the adjustment assembly from the outside. When the door lock structure fails, the adjustment assembly can be operated by the control mechanism to move the connecting plate body relative to the fixed plate body and unlock the box body, thereby opening the box door body.

[0009] Furthermore, an elastic element is provided between the fixed plate and the connecting plate to provide the resetting elastic force of the connecting plate and the driving force for the locking tongue to separate, and a baffle is provided on the side of the fixed plate near the connecting plate to block the elastic element.

[0010] Furthermore, the latch assembly includes a fixing pin disposed on the inner wall of the connecting plate, a locking rod disposed on the fixing pin that is capable of telescopic movement relative to the fixing pin, a return spring disposed between the locking rod and the fixing pin for providing elastic force in the extension direction of the locking rod, a pressing slope disposed at the extension end of the locking rod, and the locking rod being retracted by contact between the pressing slope and the box body when the box door body is closed, and a locking hole disposed on the inner wall of the box body that cooperates with the locking rod.

[0011] Furthermore, the adjustment assembly includes a rotating shaft mounted on a fixed plate, a slider threaded onto the rotating shaft, and a linkage mechanism between the slider and the locking rod for transmitting the linear motion of the slider to the locking rod.

[0012] Furthermore, the control mechanism includes a control window one located on one side of the housing and a control window two located on the connecting plate. Both control window one and control window two are equipped with protective shields for sealing and protection.

[0013] Furthermore, the slider has a through hole, and the position of the second adjustment window corresponds to the movement path of the slider on the rotating shaft, so that when the pin assembly releases the auxiliary locking between the connecting plate and the housing, the through hole on the slider is aligned with the second adjustment window on the connecting plate.

[0014] Furthermore, a connecting groove is provided at the end of the rotating shaft away from the connecting plate. The cross-sectional shape of the connecting groove is non-circular. When the main body of the door is closed, the operating tool can pass through the control window and engage with the connecting groove, so that the operating tool can drive the rotating shaft to rotate from the outside.

[0015] Furthermore, the control mechanism also includes a connecting rod whose cross-sectional shape matches the shape of the through hole. The connecting rod is used to pass through the control window and be inserted into the through hole.

[0016] Furthermore, when it is necessary to unlock the connecting plate and the housing, the rotating shaft is driven to rotate by the operating tool, causing the slider to move and the locking rod to move through the linkage mechanism until the pin assembly releases the auxiliary locking of the connecting plate and the housing. At this time, the through hole on the slider is aligned with the control window.

[0017] Furthermore, when the door lock structure fails and the connecting plate still needs to be unlocked from the box, after aligning the through hole on the slider with the second control window, the connecting rod is passed through the second control window and inserted into the through hole. The rotating shaft is then driven to rotate by the operating tool, so that the connecting plate moves relative to the fixed plate and separates from the box by means of the connection between the connecting rod and the slider.

[0018] The technical solution provided by this invention has the following advantages compared with the prior art:

[0019] 1. This invention sets up a fixed plate and a connecting plate that are independent of each other and can be moved relatively, and cooperates with an adjustment component that can control the movement of the connecting plate. This allows authorized personnel to drive the adjustment component by operating the control mechanism when the door lock structure fails due to violent damage, so that the connecting plate moves relative to the fixed plate and unlocks the lock body. This achieves non-destructive authorized opening in the event of lock damage, and solves the problem in the prior art that the lock body must be destroyed to open the lock after the lock cylinder is damaged.

[0020] 2. This invention achieves multiple independent locking by setting the door lock structure and the bolt assembly to lock the connecting plate together. Even if the door lock structure is opened or damaged by technology, the bolt assembly can still effectively prevent the main body of the box door from being pulled open, which significantly improves the overall anti-pry performance and overcomes the security defect that the whole system fails when a single lock is broken.

[0021] 3. This invention establishes a built-in, concealed emergency operation path by separately mounting the control mechanism for operating the adjustment component on the housing and the connecting plate, forming a built-in, concealed emergency operation path with the adjustment component. This path is only used when emergency operation is required, and the operation logic differs from conventional unlocking, avoiding new vulnerabilities in anti-prying caused by setting up a normally exposed emergency port on the housing, thus ensuring emergency functionality while maintaining the overall protective strength of the housing. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention;

[0024] Figure 2 This is a cross-sectional view of the box body in an embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of the structure of the main body of the cabinet door in an embodiment of the present invention;

[0026] Figure 4 This is a schematic diagram of the pin assembly in an embodiment of the present invention;

[0027] Figure 5 This is a cross-sectional view of the fixing pin in an embodiment of the present invention;

[0028] Figure 6 These are cross-sectional views of control window one and control window two in an embodiment of the present invention;

[0029] Figure 7 This is a cross-sectional view of the main body of the cabinet door in an embodiment of the present invention;

[0030] Figure 8 for Figure 7 Enlarged view of section A;

[0031] Figure 9 for Figure 7 Enlarged view of section B.

[0032] Explanation of icon numbers:

[0033] 1. Box body; 11. Box door body; 111. Fixed plate; 112. Connecting plate; 113. Elastic element;

[0034] 3. Pin assembly; 31. Fixing pin; 32. Locking rod; 33. Lock hole;

[0035] 4. Adjustment component; 41. Rotating shaft; 42. Slider; 43. Linkage mechanism; 44. Through hole; 45. Connecting groove;

[0036] 5. Control mechanism; 51. Control window one; 52. Control window two; 53. Connecting rod. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0038] The present invention will be further described below with reference to embodiments.

[0039] Example 1:

[0040] Reference Figures 1-6 This first embodiment of the invention provides a pry-resistant linkage locking device for a power distribution metering box door, including a box body 1. A door body 11 for opening and closing the box body 1 is provided on one side of the box body 1. The door body 11 includes a fixed plate 111, which is rotatably connected to the box body 1 via a high-strength hinge, allowing the entire door body 11 to open outwards like a conventional door. On the side of the fixed plate 111 closest to the inner side of the box body 1, a connecting plate 112, capable of parallel movement relative to it, is provided via a set of guide posts or guide rails.

[0041] An elastic element 113 is provided between the fixed plate 111 and the connecting plate 112. The elastic element 113 is a plurality of high-strength compression springs connected in parallel. The preferred material is 60Si2MnA spring steel, which has a high elastic limit and anti-relaxation ability.

[0042] The two ends of these springs abut against the inner surfaces of the fixed plate 111 and the connecting plate 112, respectively. The elastic coefficient and pre-compression of the springs are calculated, and the elastic force they provide is much greater than the pulling force that an adult can exert by hand. This ensures that in emergency operation, the connecting plate 112 will not be easily pulled by external force, but must rely on the mechanical advantage provided by the adjusting component 4 to move.

[0043] A high-strength steel baffle is also fixedly installed on the side of the fixed plate 111 near the connecting plate 112. The baffle completely covers the elastic element 113 and the main parts of the adjustment assembly 4 described later, and plays the role of protecting and shielding the internal mechanism.

[0044] The connecting plate 112 is provided with a door lock structure for locking it to the box 1. The door lock structure is a common pin tumbler lock or leaf lock structure. Its bolt can extend and insert into the corresponding lock slot on the frame of the box 1. This is the existing conventional setting and will not be described in detail here.

[0045] The inner wall of the connecting plate 112 is provided with a pin assembly 3 for assisting in locking the connecting plate 112 and the housing 1 when the door lock structure is locked. The pin assembly 3 includes a fixing pin 31 vertically welded to the top and bottom edges of the inner wall of the connecting plate 112. The fixing pin 31 is a hollow tubular structure. A locking rod 32 is sleeved inside each fixing pin 31. The locking rod 32 can move axially within the fixing pin 31. A return spring is provided between the locking rod 32 and the bottom of the fixing pin 31. This spring always provides an elastic force to the locking rod 32 to extend in the direction of the corresponding lock hole 33. The head of the extended end of the locking rod 32 is machined with a pressing bevel.

[0046] When the main body of the cabinet door 11 is closed, the pressing bevel of the locking rod 32 first contacts the edge of the door frame of the cabinet 1. The force on the bevel converts the horizontal closing force into an axial component force that causes the locking rod 32 to retract into the fixing pin 31. The locking rod 32 retracts against the elastic force of the return spring. When the main body of the cabinet door 11 is fully closed and the locking rod 32 moves to align with the preset lock hole 33 on the cabinet 1, the elastic force of the return spring immediately ejects the locking rod 32, causing its end to insert into the lock hole 33, thus completing the automatic locking. The core benefit of this bolt assembly 3 is that it forms a second physical lock independent of the main door lock. Even if the main door lock is opened, the upper and lower locking rods 32 remain firmly locked on the cabinet 1, effectively preventing the main body of the cabinet door 11 from being directly pulled open, achieving multiple anti-pry measures. At the same time, its automatic extension and retraction function makes the closing operation no different from that of a conventional door, requiring no additional steps.

[0047] An adjustment assembly 4 is provided on the fixed plate 111 for simultaneously controlling the locking state of the pin assembly 3 and the translation of the connecting plate 112 relative to the fixed plate 111. The adjustment assembly 4 includes a rotating shaft 41 horizontally mounted on the fixed plate 111 via a bearing seat. A precision trapezoidal thread is machined on the rotating shaft 41, and a slider 42 is screwed onto it through the thread. A linkage mechanism 43 is provided between the slider 42 and the aforementioned locking rod 32. Specifically, the linkage mechanism 43 can be a pair of hinged links, one end of which is hinged to the slider 42, and the other end is hinged to the tail of the locking rod 32. When the slider 42 moves axially along the rotating shaft 41, the linear motion is transmitted to the locking rod 32 through the linkage mechanism 43, thereby pulling the locking rod 32 axially back along the fixed pin 31 until the locking rod 32 separates from the lock hole 33, thus unlocking the pin assembly 3.

[0048] In summary, this invention constructs a basic mechanical multi-locking and internal control system through the separate design of the fixed plate 111 and the movable connecting plate 112, the independent and automatic latch assembly 3, and the adjustment assembly 4 composed of the rotating shaft 41 and the slider 42. This system provides anti-pry performance far exceeding that of a single lock under normal conditions and lays a solid structural foundation for the non-destructive emergency opening mechanism for lock failure scenarios described in subsequent embodiments.

[0049] Example 2:

[0050] Reference Figures 7-9 The second embodiment of the present invention provides a pry-proof linkage locking device for the door of a power distribution metering box. Based on the first embodiment, it further includes a complete control mechanism 5 and detailed operation logic for emergency opening.

[0051] Both the housing 1 and the connecting plate 112 are equipped with adjustment mechanisms 5 for external operation of the adjustment component 4. When the door lock structure fails due to forced entry, such as broken, twisted, or even drilled-out internal pins, preventing the key from turning and the bolt from retracting due to structural jamming, the adjustment component 4 can be operated via the adjustment mechanism 5 to move the connecting plate 112 relative to the fixed plate 111 and unlock the housing 1, thereby opening the main body 11 of the door. Such lock failure can cause serious problems in reality. When authorized repair personnel face a housing 1 with a damaged lock but a still-closed door, they often have no choice but to use destructive methods such as cutting and prying to open the door. This is not only inefficient and costly, but it can also permanently damage the housing 1, weaken its protective performance, and prolong the power outage recovery time.

[0052] The control mechanism 5 includes a control window 51 located on the side wall of the housing 1 and a control window 52 located on the connecting plate 112. Both control windows 51 and 52 are fixed with removable protective covers by screws or clips. These covers serve to prevent dust and water damage and conceal the windows when not in use.

[0053] The slider 42 of the adjusting component 4 has a through hole 44, the cross-section of which is non-circular, such as square or hexagonal. The position of the second adjusting window 52 on the connecting plate 112 precisely corresponds to the spatial position traversed by the slider 42 on the rotating shaft 41. When the slider 42 is driven to move to a specific position, that is, when the linkage mechanism 43 has completely pulled the locking rod 32 out of the locking hole 33 of the housing 1, the through hole 44 on the slider 42 is exactly aligned with the second adjusting window 52 on the connecting plate 112 in three-dimensional space.

[0054] The end of the rotating shaft 41 furthest from the connecting plate 112, i.e., the end closest to the side wall of the housing 1, has a connecting groove 45 machined at its center. The cross-sectional shape of this connecting groove 45 is also non-circular, such as hexagonal, star-shaped, or a specially designed spline shape. When the housing door 11 is closed, the operator can use a matching special operating tool, passing through the control window 51 on the housing 1, to precisely insert and engage the tool tip with the connecting groove 45. Thus, by rotating the operating tool from the outside of the housing 1, the rotating shaft 41 can be directly driven to rotate.

[0055] The control mechanism 5 also includes a separate connecting rod 53. The connecting rod 53 is made of high-strength alloy steel, and its cross-sectional shape perfectly matches the shape of the through hole 44 on the slider 42. The core function of the connecting rod 53 is that, when inserted into the aligned through hole 44 and control window 52, ​​it can mechanically and temporarily rigidly connect the slider 42 to the connecting plate 112. Its strength design is sufficient to withstand the enormous shearing forces generated during subsequent operations, ensuring reliable force transmission.

[0056] When it is necessary to unlock the connecting plate 112 from the housing 1, whether it is normal opening or emergency opening, the first step is the same:

[0057] Using an operating tool inserted through control window 51, the rotating shaft 41 is driven to rotate. The threaded drive on the rotating shaft 41 moves the slider 42 along the shaft. The slider 42, via the linkage mechanism 43, pulls the locking rod 32, causing it to overcome the force of the return spring and completely disengage from the lock hole 33 of the housing 1. When the locking rod 32 is completely disengaged from the lock hole 33, the slider 42 moves precisely to the aforementioned specific position, where its through hole 44 aligns with control window 52 on the connecting plate 112. This is a crucial mechanical position signal, indicating that the latch assembly 3 has been released and the emergency interface is in place.

[0058] When the door lock structure fails and the connecting plate 112 still needs to be unlocked from the housing 1, after the above alignment is achieved, the operation proceeds to the second step:

[0059] The connecting rod 53 is passed through the adjustment window 52 on the connecting plate 112 and firmly inserted into the through hole 44 of the slider 42. At this time, the slider 42 and the connecting plate 112 are temporarily fixed together by the connecting rod 53. Continue to rotate the operating tool in the same direction to drive the rotating shaft 41 to rotate. Since the slider 42 is restricted by the connecting rod 53 and cannot move freely along the thread of the rotating shaft 41, according to the mechanical principle of the threaded pair, the rotation of the rotating shaft 41 will be converted into a strong axial force. This force acts on the fixed plate 111 through the bearing seat, but since the fixed plate 111 is connected to the box 1 by a hinge, its overall position is restricted. Therefore, this axial force will actually pull the connecting plate 112 to translate. This translation action causes the connecting plate 112 to compress the high-strength elastic element 113 between the fixed plate 111, and at the same time forces the lock tongue of the door lock structure, which is stuck in the lock mouth of the box 1 due to the failure of the lock, to be pulled out. The mechanical gain provided by the rotating shaft 41 and the threaded pair amplifies the manually input torque into a huge linear pulling force sufficient to overcome the latch jamming and spring resistance.

[0060] Specifically, when the latch is fully pulled out of the lock, all mechanical connections between the connecting plate 112 and the housing 1 are released. At this point, the connecting plate 112 has moved a predetermined distance relative to the compression elastic element 113 of the fixed plate 111. The operator can then stop rotation, remove the connecting rod 53 and operating tools, and then, like opening a normal door, pull the entire housing body 11 outward around the hinge axis to complete the non-destructive emergency opening. After replacing the lock, the operation can be reversed to reset all mechanisms.

[0061] In summary, this invention constructs a clear, reliable, two-step purely mechanical emergency opening process through the concealed control window 51, control window 52, ​​dedicated operating tools and connecting rod 53, and the precise alignment mechanism between the through hole 44 on the slider 42 and control window 52. This process solves the problem of authorized opening after lock damage. Its core lies in intelligently differentiating the same input action of the adjustment component 4 into two output modes—either retracting only the lock rod 32 or retracting the lock rod 32 and forcibly separating the bolt—depending on whether the connecting rod 53 is engaged or disengaged. This achieves a high degree of unity between anti-pry and maintainability. Furthermore, the entire system requires no electricity, has rigorous logic, strong resistance to environmental interference, and possesses extremely high practical value.

[0062] As can be seen from Embodiments 1 and 2, the technical solution of the present invention uses the rotational motion of the rotating shaft 41 as a unified power and control core, and this single rotational motion is synchronously converted into two levels of mechanical action:

[0063] First, the slider 42 is driven to move linearly by the thread on the rotating shaft 41, and then converted into a linear pull on the locking rod 32 in the pin assembly 3 by the linkage mechanism 43, thereby realizing the locking and unlocking of the locking rod 32.

[0064] Second, by temporarily fixing the slider 42 to the connecting plate 112 by the connecting rod 53 connected at a specific position, the continuous rotation of the rotating shaft 41 is forcibly converted into the translation of the connecting plate 112 relative to the fixed plate 111, thereby achieving the forced separation of the connecting plate 112 from the lock of the box 1.

[0065] These two mechanical processes, originating from the same rotational motion, are sequentially executed in operation and act together on the connecting plate 112 in space. Thus, on the basis of releasing the locking rod 32, the micro-displacement of the forced separation failure lock tongue is superimposed, achieving a deep synergy between anti-pry locking and non-destructive emergency opening.

[0066] The significant advantages of this invention are:

[0067] First, by using the single rotational motion of the rotating shaft 41 as the mechanical input for controlling the state of the pin assembly 3 and driving the translation of the connecting plate 112, the absolute sequence and mechanical connection of the two key steps in the emergency opening process are guaranteed from the structural source, ensuring the inherent unity and non-jumpability of the authorized operation logic and preventing misoperation.

[0068] Secondly, the entire emergency activation function relies entirely on a purely mechanical linkage structure consisting of rotating shaft 41, slider 42, linkage mechanism 43, and connecting rod 53, requiring no electricity or sensors. This design gives the system extremely high environmental adaptability and resistance to damage. Even in extreme temperatures, humidity, or power-free environments, the authorized activation function remains absolutely reliable, completely eliminating the potential for electronic system failure.

[0069] Third, by placing the control windows 1 (51) and 2 (52) on the side of the enclosure 1 and on the non-front side of the connecting plate 112, and covering them with protective shields, while concealing the critical alignment interfaces deep inside the enclosure door, the emergency operation pathway is extremely well-hidden. Unauthorized personnel will find it difficult to discover, let alone know the specific logic and timing of the two-step operation, greatly enhancing the system's ability to prevent spying and unauthorized operation.

[0070] Fourth, the system integrates three major functions—multiple anti-pry, status indication, and emergency opening—into a compact mechanical module consisting of a fixed plate 111, a connecting plate 112, and an adjustment component 4. All functions rely on the precise linkage of the same mechanical structure, eliminating the need for complex external drive devices and significantly reducing the overall complexity, manufacturing cost, and long-term maintenance risks of the system.

[0071] The working principle of this invention is as follows:

[0072] When the main body of the cabinet door 11 is in the normal closed and locked position, the main door lock structure's lock tongue is inserted into the lock port of the cabinet 1, and at the same time, the locking rod 32 of the bolt assembly 3 is pushed into the upper and lower lock holes 33 of the cabinet 1 under the action of the return spring, forming multiple locks.

[0073] When the main door lock structure fails due to forced opening, causing the bolt to jam and become unable to retract, authorized maintenance personnel should perform emergency opening.

[0074] First, a special tool is used to pass through the control window 51 on the side of the housing 1 and engage with the connecting groove 45 at the end of the rotating shaft 41. The tool drives the rotating shaft 41 to rotate, which in turn drives the slider 42 to move linearly via a thread. The slider 42 pulls the locking rod 32 out of the upper and lower locking holes 33 via the linkage mechanism 43. When the locking rod 32 is completely disengaged, the slider 42 moves to the predetermined position, and its through hole 44 aligns with the control window 52 on the connecting plate 112.

[0075] In the second step, the operator inserts the high-strength connecting rod 53 through the control window 2 52 and into the through hole 44 of the slider 42, temporarily rigidly connecting the slider 42 to the connecting plate 112. The tool is then rotated in the same direction, driving the rotating shaft 41 to rotate. At this time, because the slider 42 is restricted by the connecting rod 53, the axial force generated by the rotation of the rotating shaft 41 acts on the connecting plate 112 through the bearing, thereby pushing the connecting plate 112 to translate. This translation forcefully compresses the high-strength elastic element 113 between the fixed plate 111 and the connecting plate 112, and forcibly pulls the jammed locking tongue out of the lock hole of the housing 1.

[0076] Once the bolt is fully disengaged and all connections are released, the main body of the cabinet door 11 can be opened normally. The entire process utilizes a purely mechanical structure to achieve status judgment, two-step operation, and force amplification, ultimately enabling non-destructive and safe opening even in the event of lock damage.

[0077] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A pry-resistant interlocking device for a power distribution metering box door, comprising a box body (1), characterized in that, The box body (1) is provided with a door body (11) for opening and closing the box body (1) on one side. The door body (11) includes a fixed plate (111) which is rotatably connected to the box body (1). A connecting plate (112) is provided on one side of the fixed plate (111) which can translate relative to the fixed plate (111). A door lock structure is provided on the connecting plate (112) for locking the connecting plate (112) to the box body (1). The inner wall of the connecting plate (112) is provided with a door lock structure for assisting the door lock structure when locked. A locking pin assembly (3) is provided between the locking connecting plate (112) and the housing (1). The fixed plate (111) is provided with an adjustment assembly (4) for controlling the locking state of the pin assembly (3) and the translation of the connecting plate (112) relative to the fixed plate (111). The housing (1) and the connecting plate (112) are respectively provided with a control mechanism (5) for operating the adjustment assembly (4) from the outside. When the door lock structure fails, the adjustment assembly (4) can be operated by the control mechanism (5) to make the connecting plate (112) relative to the fixed plate. (111) Move and unlock the box body (1) to open the box door body (11). The adjustment component (4) includes a rotating shaft (41) installed on the fixed plate (111). A slider (42) is threadedly installed on the rotating shaft (41). A linkage mechanism (43) is provided between the slider (42) and the locking rod (32) to transmit the linear motion of the slider (42) to the locking rod (32). The control mechanism (5) includes a control window (51) provided on one side of the box body (1) and a control window (51) provided on the connecting plate (111). 2) The second control window (52) on the control window is provided with a protective cover plate for sealing protection at both the first control window (51) and the second control window (52). The slider (42) is provided with a through hole (44). The position of the second control window (52) corresponds to the movement path of the slider (42) on the rotating shaft (41) so that when the pin assembly (3) releases the auxiliary locking of the connecting plate (112) and the box (1), the through hole (44) on the slider (42) is aligned with the second control window (52) on the connecting plate (112).

2. The anti-pry linkage locking device for the door of a power distribution metering box according to claim 1, characterized in that, An elastic element (113) is provided between the fixed plate (111) and the connecting plate (112) for providing the resetting elastic force of the connecting plate (112) and the locking tongue separation driving force. A baffle for blocking the elastic element (113) is provided on the side of the fixed plate (111) near the connecting plate (112).

3. The anti-pry linkage locking device for the door of a power distribution metering box according to claim 1, characterized in that, The latch assembly (3) includes a fixing pin (31) disposed on the inner wall of the connecting plate (112). A locking rod (32) is disposed on the fixing pin (31) and is capable of telescopic movement relative to the fixing pin (31). A return spring is disposed between the locking rod (32) and the fixing pin (31) to provide elastic force in the extension direction of the locking rod (32). A pressing slope is disposed at the extension end of the locking rod (32). When the main body of the door (11) is closed, the locking rod (32) can retract by contacting the door body (1) through the pressing slope. A lock hole (33) is disposed on the inner wall of the door body (1) to cooperate with the locking rod (32).

4. The anti-pry linkage locking device for the door of a power distribution metering box according to claim 3, characterized in that, The rotating shaft (41) is provided with a connecting groove (45) at one end away from the connecting plate (112). The cross-sectional shape of the connecting groove (45) is non-circular. When the box door body (11) is closed, the operating tool can pass through the control window (51) and engage with the connecting groove (45), so that the operating tool can drive the rotating shaft (41) to rotate from the outside.

5. The anti-pry linkage locking device for the door of a power distribution metering box according to claim 4, characterized in that, The control mechanism (5) also includes a connecting rod (53), the cross-sectional shape of which matches the shape of the through hole (44), and the connecting rod (53) is used to pass through the control window (52) and be inserted into the through hole (44).

6. The anti-pry linkage locking device for the door of a power distribution metering box according to claim 5, characterized in that, When it is necessary to unlock the connecting plate (112) from the box (1), the rotating shaft (41) is driven to rotate by the operating tool, so that the slider (42) moves and the locking rod (32) moves through the linkage mechanism (43) until the pin assembly (3) releases the auxiliary locking of the connecting plate (112) and the box (1). At this time, the through hole (44) on the slider (42) is aligned with the second control window (52).

7. The anti-pry linkage locking device for the door of a power distribution metering box according to claim 5, characterized in that, When the door lock structure fails and the connecting plate (112) still needs to be unlocked from the box (1), after the through hole (44) on the slider (42) is aligned with the second control window (52), the connecting rod (53) is passed through the second control window (52) and inserted into the through hole (44). The rotating shaft (41) is driven to rotate by the operating tool, so that the connecting plate (112) is translated relative to the fixed plate (111) and separated from the box (1) by means of the connection between the connecting rod (53) and the slider (42).

Images