Jack-up anti-damage metering box with sound-light linkage warning

Abstract

The present application discloses a pry-mounted anti-damage metering box with sound-light linkage warning, comprising a box body, a box door and a sound-light alarm assembly arranged on the box body, an inner wall of the box body is provided with a trigger box, a balance lever is rotatably arranged in the trigger box, and an inner wall of the box door is provided with a sensing assembly linked with the balance lever. When the box door is closed, the sensing assembly synchronously applies force to keep the balance lever balanced; when the box door is partially pryed, the sensing assembly is unbalanced to make the balance lever deflect, drive a knocking block to trigger a press switch to start sound-light alarm. Meanwhile, the balance lever deflection drives a first wedge to push a second wedge to form self-locking, lock the balance lever at the deflection position, make the knocking block continuously trigger the press switch, and keep the sound-light alarm continuous. The present application is purely mechanical linkage, can accurately distinguish legal door opening and illegal prying, and the alarm is continuous and cannot be interrupted, which is suitable for anti-damage protection of outdoor unattended metering box.

Description

Technical Field

[0001] This invention belongs to the field of metering box safety protection technology, and in particular relates to a skid-mounted anti-vandalism metering box with audible and visual alarm linkage. Background Technology

[0002] Metering boxes are core equipment in power systems used to install electricity metering instruments, and are widely deployed in outdoor power distribution lines, factory workshops, residential areas, and remote transformer substations. Among them, skid-mounted metering boxes adopt an integrated frame structure design, which highly integrates metering instruments, data acquisition terminals, communication modules, and auxiliary equipment into a closed box. They have advantages such as small footprint, quick overall hoisting and placement, and less on-site construction, and have become the mainstream equipment form in the field of power metering.

[0003] Because metering boxes bear critical functions such as electricity metering, data acquisition, and remote communication, their internal instruments and data acquisition modules are of high value. Furthermore, they are often installed in remote, unattended outdoor locations, making their structure vulnerable to damage such as illegal prying and external force. Once the box door is pried open, it can not only lead to instrument damage and data loss, but also potentially cause serious consequences such as electricity theft and metering data tampering, directly affecting the accuracy of electricity metering and the safety of power grid operation.

[0004] Currently, anti-vandalism measures for metering boxes mainly rely on two methods: one is to use high-strength metal boxes and anti-theft locks to slow down the rate of vandalism by improving structural strength; the other is to install electronic alarm devices on the box, using door magnetic switches, infrared sensors, or vibration sensors to detect unauthorized opening or impact, and trigger audible and visual alarms or remote communication alarms. Some high-end metering boxes are also equipped with video surveillance or remote access control systems.

[0005] However, the aforementioned existing technologies still have the following shortcomings: Firstly, high-strength enclosures and anti-theft locks can only passively delay the time of damage and cannot actively issue warning signals when damage occurs. Once the enclosure is successfully breached, the maintenance personnel cannot be notified in time, resulting in a significant lag in the protective effect.

[0006] Secondly, the sensing methods of electronic alarm devices have limitations. Existing devices generally use magnetic door switches or surface vibration sensors, whose sensing logic is "alarm upon door opening" or "alarm upon vibration," making it difficult to distinguish the essential differences between legitimate door opening, environmental vibration, and illegal prying. In actual use, they are prone to generating numerous false alarms due to wind and sand impacts, vehicle passage, and personnel touch. Furthermore, when a vandal uses delicate operations such as thin-blade prying or widening the door gaps to cause a slight displacement of the door, existing sensors cannot reliably identify this minute displacement, posing a risk of missed alarms. In addition, the trigger signal is an instantaneous electrical signal, making the alarm prone to interruption and unable to maintain continuous audible and visual warnings during sustained vandalism. To solve these problems, a skid-mounted vandal-resistant metering box with audible and visual linkage warnings is proposed. Summary of the Invention

[0007] The purpose of this invention is to provide a skid-mounted, tamper-proof metering box with audible and visual alarms, thereby solving the problems mentioned in the background art.

[0008] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution: This invention relates to a skid-mounted, vandal-resistant metering box with audible and visual alarm linkage, comprising a metering box body, a base disposed at the bottom of the metering box body, and a door connected to the front side of the metering box body, and further comprising: An audible and visual alarm component is installed on the metering box body; The trigger box is located on the inner wall of the metering chamber. The lever assembly is rotatably mounted inside the trigger box; At least one set of sensing components is movably disposed on the inner wall of the metering box body, with one end abutting against the box door and the other end connected to the lever assembly through a transmission assembly; An elastic element is disposed between the transmission assembly and the trigger box; A striking element is disposed at one end of the lever assembly; The switch is located inside the trigger box and is connected to the audible and visual alarm assembly, and is arranged opposite to the striking component. When the door is illegally displaced, the lever assembly deflects, driving the striking component to trigger the switch and activate the audible and visual alarm.

[0009] Preferably, the lever assembly is a balance lever, which is rotatably mounted in the trigger box via a pin. The sensing assembly includes a top post and a sensing ball head disposed at one end of the top post. The transmission assembly includes a wire rope and a push block, with a pushing ball head at one end of the push block, which is inserted into a ball socket on the surface of the balance lever.

[0010] Preferably, there are three sets of top columns, which are respectively set on the inner side of the top wall, left side wall and right side wall of the metering box body door frame, and the axis of each top column is perpendicular to the plane of the box door; the inner wall of the metering box body is fixedly provided with a guide fixing seat and a guide seat, the guide fixing seat is used to limit and guide the steel wire rope, and the top column is slidably set in the guide seat.

[0011] Preferably, the striking element is a striking block, which is fixedly disposed at one end of the balance lever; the switching element is a push switch, which is electrically connected to the sound and light alarm component and is arranged opposite to the striking block; the trigger box is provided with a limiting post to limit the balance lever to deflect only in one direction.

[0012] Preferably, a stop block seat is fixedly provided inside the trigger box, and a push switch and a locking box are fixedly provided on the surface of the stop block seat. A first sliding groove and a second sliding groove are provided inside the locking box. A connecting rod is hinged to one surface of the striking block, and a first wedge is fixedly provided at one end of the connecting rod. The first wedge slides in cooperation with the first sliding groove. A second spring is fixedly provided inside the second sliding groove, and a second wedge is fixedly connected to the upper end of the second spring. When the balance lever deflects, the first wedge slides along the first groove and pushes the second wedge to compress the second spring. After the first wedge passes the second wedge, the second spring resets, causing the second wedge to abut against the first wedge to form a self-locking mechanism, keeping the balance lever in the deflected position and causing the striking block to continuously trigger the push switch.

[0013] Preferably, the wedge angle between the first wedge and the second wedge is smaller than the steel-to-steel friction angle, thus forming a self-locking fit.

[0014] Preferably, the trigger box is provided with a reset interface for manually releasing the self-locking mechanism and resetting the balance lever.

[0015] Preferably, the audible and visual alarm component is an audible and visual alarm light, which is disposed on the upper surface of the metering box body.

[0016] Preferably, the trigger box is provided with a limiting post to limit the balance lever to deflect only in one direction.

[0017] Preferably, the elastic element is a first spring, which is sleeved on the circumferential side of the wire rope and fixedly disposed between the trigger box and the push block.

[0018] The present invention has the following beneficial effects: 1. This invention achieves accurate identification and sound and light linkage warning of illegal prying behavior. Specifically, it is achieved by setting up three sets of sensing components and a balancing lever. When the door is closed normally, the three sets of sensing components are simultaneously pressed and the balancing lever remains balanced. When illegal prying occurs, the local sensing components are unloaded first and the balancing lever deflects due to imbalance. This enables the anti-vandalism system to accurately distinguish between legal door opening and illegal prying behavior, fundamentally solving the technical problems of high false alarm rate and missed detection of minor prying in existing electronic alarm devices. 2. This invention achieves continuous audible and visual alarm and mechanical locking of the cabinet door after alarm triggering. Specifically, it sets a striking block and a first wedge on the balance lever, and correspondingly sets a switch and a second wedge in the trigger box. When the balance lever deflects, the striking block triggers the switch to activate the audible and visual alarm. At the same time, the first wedge pushes the second wedge to slide and cross over to form a wedge self-lock, keeping the balance lever in the deflected position. The striking block continuously triggers the switch, thus maintaining the audible and visual alarm until manually deactivated. This solves the problems of the existing technology where the alarm signal is triggered instantaneously, easily interrupted, and the cabinet door can still be opened, resulting in incomplete protection. 3. This invention implements a reliable reset mechanism that allows the alarm state to be manually deactivated only from inside the enclosure. Specifically, a reset interface is set on the trigger box, which faces inward. The self-locking state after the alarm is triggered can only be deactivated by maintenance personnel from inside the enclosure using a special tool. External vandals cannot access the reset interface, thus structurally eliminating the possibility of forced reset or deactivation of the alarm from the outside, significantly improving the safety protection level of the metering box in unattended scenarios.

[0019] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments 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.

[0021] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a cross-sectional structural diagram of the present invention; Figure 3 This is a schematic diagram of the internal structure of the present invention; Figure 4 This is a schematic diagram of the wire drive mechanism of the present invention; Figure 5 for Figure 4 A magnified schematic diagram of the partial structure at point A in the middle; Figure 6 This is a schematic diagram of the internal structure of the lever triggering mechanism of the present invention; Figure 7 for Figure 6 A schematic diagram of the rear structure; Figure 8 for Figure 7 A magnified schematic diagram of the local structure at point B; Figure 9 This is a schematic diagram of the impact locking component of the present invention.

[0022] The components represented by each number in the attached diagram are listed below: 1. Metering box body; 2. Audible and visual alarm light; 3. Steel wire rope; 4. Guide fixing seat; 5. Trigger box; 6. Balance lever; 7. Guide seat; 8. Top column; 9. Box door; 10. Base; 11. Pin; 12. First spring; 13. Push block; 14. Stop block seat; 15. Knocking block; 16. Thrust ball head; 17. Locking box; 18. Connecting rod; 19. First wedge; 20. Press switch; 21. First slide groove; 22. Second slide groove; 23. Second spring; 24. Second wedge; 25. Sensing ball head. Detailed Implementation

[0023] 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 embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] In the description of this invention, it should be understood that the terms "upper," "middle," "outer," "inner," etc., which indicate orientation or positional relationship, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0025] Please see Figures 1-9 As shown, the present invention is a skid-mounted anti-vandalism metering box with sound and light linkage warning, including a metering box body 1, a base 10 set at the bottom of the metering box body 1, and a box door 9 connected to the front side of the metering box body 1. A sound and light alarm light 2 for emitting sound and light alarm is fixedly installed on the upper surface of the metering box body 1. A trigger box 5 is fixedly installed on the top surface of the inner wall of the metering box body 1. A balance lever 6 is rotatably installed in the trigger box 5 through a pin 11. The front and rear surfaces of the balance lever 6 are respectively provided with ball sockets for receiving external forces.

[0026] Please combine Figures 1 to 5The inner wall of the metering box body 1 is equipped with three sets of sensing components for sensing the displacement of the box door 9. The three sets of sensing components are respectively installed on the inner side of the top wall, left wall and right wall of the door frame of the metering box body 1, and the axis of each sensing component is perpendicular to the plane of the box door 9. Each sensing component includes a top post 8 and a sensing ball head 25 fixed to one end of the top post 8. The sensing ball head 25 abuts against the inner wall of the box door 9. The top post 8 is slidably disposed in the guide seat 7. The guide seat 7 is fixedly installed on the inner wall of the metering box body 1 and is used to limit and guide the top post 8. The other end of each top column 8 is connected to the balance lever 6 through a transmission assembly. The transmission assembly includes a steel wire rope 3 and a push block 13. One end of the steel wire rope 3 is fixedly connected to the top column 8, and the other end of the steel wire rope 3 passes through the side wall of the trigger box 5 and is fixedly connected to the push block 13. The push block 13 is slidably disposed in the trigger box 5. A push ball head 16 is fixedly disposed at the end of the push block 13 near the balance lever 6. The push ball head 16 is inserted into the ball socket at the corresponding position on the surface of the balance lever 6, thereby realizing the linkage between the top column 8 and the balance lever 6.

[0027] A guide fixing seat 4 is also fixedly installed on the inner wall of the metering box body 1 to limit and guide the direction of the wire rope 3, so as to prevent the wire rope 3 from deviating or interfering during transmission. A first spring 12 is provided between the push block 13 and the inner wall of the trigger box 5. The first spring 12 is sleeved on the circumferential side of the wire rope 3. One end of the first spring 12 abuts against the inner wall of the trigger box 5, and the other end of the first spring 12 abuts against the push block 13. The first spring 12 always pushes the push block 13 towards the balance lever 6, thereby eliminating the transmission idle stroke between the push block 13 and the wire rope 3, and ensuring that the displacement of the top column 8 can be transmitted to the balance lever 6 in a timely and accurate manner.

[0028] Please combine Figures 6 to 9 A striking block 15 is fixedly installed at one end of the balance lever 6. A stop block seat 14 is fixedly installed on the bottom surface of the inner wall of the trigger box 5. A push switch 20 is fixedly installed on the surface of the stop block seat 14. The push switch 20 is electrically connected to the audible and visual alarm light 2 via a wire. The position of the push switch 20 corresponds to that of the striking block 15, with a gap between them. A limit post is also fixedly installed inside the trigger box 5. The limit post is located on the deflection path of the balance lever 6 and is used to limit the balance lever 6 to deflect in only one direction, thereby ensuring that the striking block 15 can accurately strike the push switch 20 each time it is triggered.

[0029] When the door 9 is in the normally closed state, the sensing ball heads 25 of the three sets of top columns 8 are all in contact with the inner wall of the door 9. The door 9 applies a uniform pushing force to the three sets of top columns 8, and the three sets of top columns 8 compress backward synchronously. The three steel wire ropes 3 pull the corresponding push blocks 13 synchronously. The pushing ball heads 16 on the three push blocks 13 synchronously press the three ball sockets of the balance lever 6. The forces in the three directions are equal in magnitude and balanced in direction. The resultant torque on the balance lever 6 is zero, and the balance lever 6 remains in a static equilibrium state.

[0030] When the cabinet door 9 is legally opened, the cabinet door 9 moves outward as a whole. The three sets of sensing ball heads 25 simultaneously lose the resistance of the cabinet door 9. The three sets of top columns 8 rebound forward simultaneously under the action of the first spring 12. The three steel wire ropes 3 relax simultaneously. The three push blocks 13 unload force simultaneously. The pushing force on the three ball sockets of the balance lever 6 decreases simultaneously. The balance lever 6 always maintains a state of force balance and does not deflect. The knocking block 15 remains separated from the push switch 20. The audible and visual alarm light 2 does not activate.

[0031] When the cabinet door 9 is illegally pried open, the destructive force acts on a local area of ​​the cabinet door 9, causing the cabinet door 9 to warp and deform locally rather than move outward uniformly as a whole. This causes the sensing ball heads 25 of one or two sets of top posts 8 to detach from the inner wall of the cabinet door 9 first, and the corresponding top post 8 to rebound forward first. The steel wire rope 3 in that direction slackens first, and the corresponding push block 13 is relieved first, while the remaining top posts 8 remain under pressure. The pushing force on the three ball sockets of the balance lever 6 is no longer equal, and the balance lever 6 is unbalanced. It deflects in one direction around the pin 11. The striking block 15 fixed to one end of the balance lever 6 deflects with the lever and strikes the push switch 20 on the stop block seat 14. After the push switch 20 is triggered, it closes, and the power supply circuit of the audible and visual alarm light 2 is turned on. The audible and visual alarm light 2 emits a continuous audible and visual alarm signal.

[0032] By utilizing the above technical solution and the principle of force balance between the three sets of top columns 8 and the balance lever 6, when the door 9 is closed normally, the three sets of top columns 8 are simultaneously compressed and the balance lever 6 remains balanced. When illegally pried, the top columns 8 are unloaded first and the balance lever 6 deflects out of balance. This physical difference enables the system to accurately distinguish between legal door opening and illegal prying behavior, fundamentally solving the technical problems of high false alarm rate and missed detection of minor prying in existing electronic alarm devices.

[0033] Please combine Figure 9 The present invention also includes a wedge-shaped self-locking structure for locking the balance lever 6 in a deflected position after the alarm is triggered. A connecting rod 18 is hinged to one surface of the striking block 15, and a first wedge 19 is fixedly disposed at the end of the connecting rod 18 away from the striking block 15. A locking box 17 is also fixedly disposed on the surface of the stop block seat 14. A first sliding groove 21 and a second sliding groove 22 are provided in the locking box 17, wherein the first sliding groove 21 is horizontally disposed and the second sliding groove 22 is vertically disposed. The first wedge 19 is slidably disposed in the first sliding groove 21, and a second spring 23 is fixedly disposed in the second sliding groove 22. A second wedge 24 is fixedly connected to the upper end of the second spring 23 and is slidably disposed in the second sliding groove 22. Both the first wedge 19 and the second wedge 24 are wedge-shaped block structures, and the wedge angle of both is smaller than the steel-steel friction angle, thereby forming a self-locking fit.

[0034] When the balance lever 6 deflects, the striking block 15 moves the connecting rod 18 hinged to it. The connecting rod 18 pushes the first wedge 19 to slide horizontally along the first groove 21. The wedge-shaped inclined surface of the first wedge 19 contacts and presses against the wedge-shaped inclined surface of the second wedge 24, pushing the second wedge 24 to slide downward along the second groove 22, compressing the second spring 23. When the first wedge 19 continues to slide horizontally and passes the most convex point of the second wedge 24, the wedge-shaped inclined surface of the first wedge 19 disengages from the wedge-shaped inclined surface of the second wedge 24. The second spring 23 resets and pushes the second wedge 24 to slide upward. The vertical back surface of the second wedge 24 abuts against the vertical back surface of the first wedge 19, forming a wedge self-locking mechanism. At this time, the balance lever 6 is locked in the deflected position and cannot return to its original position. The striking block 15 continues to press on the surface of the push switch 20, keeping the audible and visual alarm light 2 in a continuous alarm state. Even if the striking block 15 undergoes slight displacement due to vibration or other factors, the balance lever 6 remains in the deflected position due to the wedge-shaped self-locking mechanism. The push switch 20 is always pressed, and the audible and visual alarm light 2 continues to work without interruption due to external interference.

[0035] It should be noted that the connecting rod 18 and the striking block 15 are connected by a hinge. When the balance lever 6 rotates around the pin 11, the striking block 15 moves in an arc with the lever. The hinge structure allows the connecting rod 18 to adaptively adjust the angle, converting the arc motion of the striking block 15 into the horizontal linear motion of the first wedge 19 along the first slide groove 21, thus avoiding structural jamming or interference caused by inconsistent motion directions.

[0036] Through the above technical solution, when the balance lever 6 deflects, the striking block 15 triggers the press switch 20 to activate the audible and visual alarm. At the same time, the first wedge 19 pushes the second wedge 24 to slide and pass over to form a wedge self-locking mechanism, keeping the balance lever 6 in the deflected position. The striking block 15 continuously triggers the press switch 20, thus achieving continuous maintenance of the audible and visual alarm. This solves the problem in the prior art where the alarm signal is triggered instantaneously and is easily interrupted, resulting in incomplete protection.

[0037] The bottom of the trigger box 5 is also equipped with a reset interface (not shown in the figure). The reset interface is set towards the inside of the metering box body 1, and the reset interface is a non-standard irregular hole structure, which requires the use of special tools to operate. When the maintenance personnel arrive at the site and confirm safety, they must first open the metering box body 1 in a legal manner, insert the special tool into the reset interface from inside the box, rotate the reset lever, drive the balance lever 6 to deflect in the opposite direction, so that the wedge-shaped inclined surface of the first wedge 19 presses the wedge-shaped inclined surface of the second wedge 24 again, push the second wedge 24 to slide down along the second slide groove 22, the first wedge 19 slides in the opposite direction along the first slide groove 21 and disengages from the second wedge 24, the second spring 23 resets and pushes the second wedge 24 back to the initial position, the wedge self-locking is released, the balance lever 6 returns to the balanced position, the knocking block 15 disengages from the press switch 20, the press switch 20 is disconnected, and the audible and visual alarm light 2 stops alarming. Maintenance personnel then closed the enclosure door 9, and the three sets of top columns 8 were synchronously pressed again. The balance lever 6 returned to the balanced standby state, and the system completed secondary arming. Because the reset interface is located inside the enclosure and requires special tools to operate, external vandals cannot access the reset interface or perform a reset operation, fundamentally eliminating the possibility of forcibly deactivating the alarm and locking from the outside.

[0038] Through the above technical solution, this invention integrates four functions—sensing, alarm, self-locking, and reset—into a single purely mechanical linkage mechanism. It requires no electronic sensors or external continuous power supply. Utilizing the force balance principle of the three sets of top columns 8 and the balancing lever 6, it accurately distinguishes between legitimate opening and illegal prying, effectively avoiding the common false alarms and missed alarms of electronic alarm devices. Utilizing the wedge-shaped self-locking principle of the first wedge 19 and the second wedge 24, it maintains continuous audible and visual alerts after alarm triggering, avoiding the defect of momentary alarm interruption. By using a reset interface facing inwards and a dedicated tool operation method, it achieves reliable reset control of the alarm state, significantly improving the vandal resistance security level of the skid-mounted metering box in unattended scenarios.

[0039] Working principle: The metering box body 1 is fixedly installed in the outdoor working position by the base 10. When the box door 9 is in the normal closed state, the sensing ball heads 25 of the three sets of top columns 8 are all in contact with the inner wall of the box door 9. The box door 9 applies a uniform pushing force to the three sets of top columns 8, and the three sets of top columns 8 are compressed backward synchronously. The three steel wire ropes 3 pull the corresponding push blocks 13 synchronously. The pushing ball heads 16 on the three push blocks 13 synchronously press the three ball sockets of the balance lever 6. The forces in the three directions are equal in magnitude and balanced in direction. The resultant torque on the balance lever 6 is zero. The balance lever 6 remains in a static equilibrium state. The knocking block 15 is separated from the pressing switch 20. The audible and visual alarm light 2 does not work, and the whole machine is in a standby protection state.

[0040] When the staff opens the cabinet door 9 legally, the cabinet door 9 moves outward around the hinge. The three sets of sensing ball heads 25 simultaneously lose the resistance of the cabinet door 9. The three sets of top columns 8 rebound forward simultaneously under the action of the first spring 12. The three steel wire ropes 3 relax simultaneously. The three push blocks 13 unload force simultaneously. The pushing force on the three ball sockets of the balance lever 6 decreases simultaneously. The balance lever 6 always maintains a state of force balance and does not deflect. The knocking block 15 remains separated from the push switch 20. The audible and visual alarm light 2 does not activate. The cabinet door 9 can be opened normally, completely eliminating the problem of false alarm triggering.

[0041] When illegal acts of damage occur, such as prying, inserting thin blades, breaking locks, or prying open the cabinet door 9, the destructive force acts on a local area of ​​the cabinet door 9 rather than the whole. This results in millimeter-level non-uniform displacement of the cabinet door 9, such as local warping, unilateral misalignment, or door tilting, rather than a uniform outward translation. At this time, the sensing ball head 25 on the pried side is the first to lose contact with the inner wall of the cabinet door 9, and the corresponding top post 8 is the first to lose the door panel pressure and quickly rebounds forward under the action of the first spring 12. The steel wire rope 3 in this direction is the first to slacken, and the corresponding push block 13 is the first to unload the force. However, the other two sets of top posts 8 are still pressed by the cabinet door 9. The pushing force on the three ball sockets of the balance lever 6 is no longer equal, and the three-point force balance is broken instantly. Under the action of unilateral pressure, the balance lever 6 deflects rapidly in one direction around the pin 11.

[0042] When the balance lever 6 deflects, relying on the rigid linkage of the integrated lever, two anti-vandalism actions are completed simultaneously with one deflection: The first action is that the striking block 15, fixed to one end of the balance lever 6, deflects with the lever and strikes the push switch 20 on the stop block seat 14. After the push switch 20 is triggered, it closes, and the power supply circuit of the audible and visual alarm light 2 is turned on. The audible and visual alarm light 2 emits a continuous high-decibel audible and visual alarm signal to deter illegal operations on site and remind people in the surrounding area.

[0043] In the second action, the striking block 15 deflects, causing the connecting rod 18 hinged to it to move. The connecting rod 18 pushes the first wedge 19 to slide horizontally along the first groove 21. The wedge-shaped inclined surface of the first wedge 19 contacts and presses against the wedge-shaped inclined surface of the second wedge 24, pushing the second wedge 24 to slide downward along the second groove 22, compressing the second spring 23. When the first wedge 19 continues to slide horizontally and passes the most convex point of the second wedge 24, the second spring 23 returns to its original position, pushing the second wedge 24 to slide upward. The vertical back surface of the second wedge 24 abuts against the vertical back surface of the first wedge 19, forming a wedge self-locking mechanism. The balance lever 6 is locked in the deflected position and cannot return to its original position on its own. The striking block 15 continues to press on the surface of the push switch 20, keeping the audible and visual alarm light 2 in a continuous alarm state. Even if the vandal briefly stops or tries to knock on the box to disengage the switch, the wedge self-locking keeps the balance lever 6 in the deflected position, and the striking block 15 always presses down on the push switch 20, so the alarm continues.

[0044] Upon arrival at the site, maintenance personnel must first legally open the metering box body 1. Locate the reset interface at the bottom of the trigger box 5 inside the box. Insert a special tool into the reset interface, rotate the reset lever, and the balance lever 6 will deflect in the opposite direction. This causes the wedge-shaped inclined surface of the first wedge 19 to press against the wedge-shaped inclined surface of the second wedge 24 again, pushing the second wedge 24 downwards along the second slide groove 22. The first wedge 19 slides in the opposite direction along the first slide groove 21 and disengages from the second wedge 24. The second spring 23 resets, pushing the second wedge 24 back to its initial position. The wedge self-locking is released, the balance lever 6 returns to its balanced position, the striking block 15 disengages from the press switch 20, the press switch 20 is disconnected, and the audible and visual alarm light 2 stops alarming. Afterwards, the maintenance personnel close the box door 9, and the three sets of top columns 8 are synchronously pressed again. The balance lever 6 re-enters the balanced standby state, and the system completes secondary arming. Because the reset interface is located inside the enclosure and requires special tools to operate, external saboteurs cannot access the reset interface or perform the reset operation, thus fundamentally eliminating the possibility of forcibly deactivating the alarm from the outside.

[0045] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0046] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A skid-mounted, vandal-resistant metering box with audible and visual alarm linkage, comprising a metering box body (1), a base (10) disposed at the bottom of the metering box body (1), and a door (9) connected to the front side of the metering box body (1), characterized in that, Also includes: An audible and visual alarm assembly is installed on the metering box body (1); Trigger box (5) is located on the inner wall of metering box body (1); The lever assembly is rotatably mounted inside the trigger box (5); At least one set of sensing components is movably disposed on the inner wall of the metering box body (1), with one end abutting against the box door (9) and the other end connected to the lever assembly through a transmission component; An elastic element is disposed between the transmission assembly and the trigger box (5); A striking element is disposed at one end of the lever assembly; The switch is located inside the trigger box (5) and connected to the sound and light alarm assembly. It is arranged opposite to the knocking component. When the door (9) is illegally displaced, the lever assembly deflects, driving the knocking component to trigger the switch and start the sound and light alarm.

2. The skid-mounted, vandal-resistant metering box with audible and visual alarm linkage as described in claim 1, characterized in that, The lever assembly is a balance lever (6), which is rotatably mounted in the trigger box (5) via a pin (11). The sensing assembly includes a top post (8) and a sensing ball head (25) located at one end of the top post (8). The transmission assembly includes a wire rope (3) and a push block (13). One end of the push block (13) is provided with a thrust ball head (16), which is inserted into a ball socket on the surface of the balance lever (6).

3. The skid-mounted, vandal-resistant metering box with audible and visual alarm linkage as described in claim 2, characterized in that, The top posts (8) are in three groups, respectively set on the top wall, left wall and right wall of the door frame of the metering box body (1), and the axis of each top post (8) is perpendicular to the plane of the box door (9); the inner wall of the metering box body (1) is fixedly provided with a guide fixing seat (4) and a guide seat (7), the guide fixing seat (4) is used to limit and guide the steel wire rope (3), and the top posts (8) are slidably set in the guide seat (7).

4. The skid-mounted, vandal-resistant metering box with audible and visual alarm linkage as described in claim 2, characterized in that, The striking component is a striking block (15), which is fixedly installed at one end of the balance lever (6); the switching component is a push switch (20), which is electrically connected to the sound and light alarm component and is arranged opposite to the striking block (15); the trigger box (5) is provided with a limiting post to limit the balance lever (6) to deflect only in one direction.

5. The skid-mounted, vandal-resistant metering box with audible and visual alarm linkage as described in claim 4, characterized in that, The trigger box (5) is fixedly provided with a stop block seat (14), and a push switch (20) and a locking box (17) are fixedly provided on the surface of the stop block seat (14). The locking box (17) is provided with a first sliding groove (21) and a second sliding groove (22). A connecting rod (18) is hinged to one surface of the striking block (15), and a first wedge (19) is fixedly provided at one end of the connecting rod (18). The first wedge (19) slides in cooperation with the first sliding groove (21). A second spring (23) is fixedly provided in the second sliding groove (22), and a second wedge (24) is fixedly connected to the upper end of the second spring (23). When the balance lever (6) deflects, the first wedge (19) slides along the first groove (21) and pushes the second wedge (24) to compress the second spring (23). After the first wedge (19) passes the second wedge (24), the second spring (23) resets so that the second wedge (24) abuts against the first wedge (19) to form a self-locking mechanism, keeping the balance lever (6) in the deflected position, so that the striking block (15) continuously triggers the push switch (20).

6. The skid-mounted, vandal-resistant metering box with audible and visual alarm linkage as described in claim 5, characterized in that, The wedge angle between the first wedge (19) and the second wedge (24) is smaller than the steel-to-steel friction angle, thus forming a self-locking fit.

7. The skid-mounted, vandal-resistant metering box with audible and visual alarm linkage as described in claim 5, characterized in that, The trigger box (5) is provided with a reset interface for manually releasing the self-locking and resetting the balance lever (6).

8. The skid-mounted, vandal-resistant metering box with audible and visual alarm linkage as described in claim 1, characterized in that, The sound and light alarm component is a sound and light alarm lamp (2), which is installed on the upper surface of the metering box body (1).

9. The skid-mounted, vandal-resistant metering box with audible and visual alarm linkage as described in claim 1, characterized in that, The trigger box (5) is equipped with a limiting post to limit the balance lever (6) to deflect only in one direction.

10. The skid-mounted, vandal-resistant metering box with audible and visual alarm linkage as described in claim 1, characterized in that, The elastic element is a first spring (12), which is sleeved on the circumferential side of the wire rope (3) and fixedly disposed between the trigger box (5) and the push block (13).

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