Electricity larceny prevention meter box

Abstract

The application discloses a kind of anti-theft electricity metering box, including box and box door, be equipped with the lock tongue that can be along its own axial telescopic on box door, box is equipped with lock box corresponding lock tongue, lock tongue is connected with the elastic push tongue mechanism that lock tongue is continuously stretched to lock box direction, lock box is equipped with lock tongue receiving cavity, lock tongue receiving cavity includes normal receiving area and fracture receiving area;Lock box is also equipped with broken tongue driving mechanism, lock tongue is cut off, broken tongue driving mechanism drives lock tongue that is broken in normal receiving area shifts to fracture receiving area, then elastic push tongue mechanism pushes subsequent lock tongue into normal receiving area, so that box door still remains locking after lock tongue is cut off.The beneficial effects of the present application are: through consumable lock tongue, provide continuous defense capability against lock tongue damage, automatically complete obstacle removal and replacement after lock tongue is damaged, improve the difficulty and cost of violent door opening.

Description

Technical Field

[0001] This invention relates to the field of electricity metering box technology, and specifically to an anti-theft electricity metering box. Background Technology

[0002] Electricity metering is the process of settling electricity bills between power suppliers and consumers. To ensure stable electricity consumption, accurate metering is essential. Electricity metering boxes are specialized enclosures for installing electricity metering devices, typically located on the user's side. Since metering results directly affect electricity billing, unscrupulous users often vandalize metering boxes to steal electricity. Their main methods include forcibly opening the box door and then illegally connecting bypass current circuits, short-circuiting voltage circuits, or directly replacing internal metering components to steal electricity.

[0003] To address the aforementioned issues, patent application CN201710507450.3 discloses an electricity meter box with an anti-theft alarm function. This device disconnects the power supply to the meter box when the door is opened, and simultaneously triggers an alarm signal, thus providing some degree of anti-theft protection. However, this protection primarily focuses on whether the door has been opened, representing a reactive measure. If acts of vandalism, such as cutting the lock tongue, are being performed but the door remains closed, the alarm mechanism cannot be triggered. By the time the alarm is triggered, the door has already been breached. Furthermore, meter boxes are often installed outdoors and unattended, leaving a time lag between the alarm being triggered and the arrival of maintenance personnel. During this interval, criminals have ample time to complete electricity theft or even restore the scene. Summary of the Invention

[0004] The purpose of this invention is to provide an anti-theft electricity metering box to solve the problems of delayed response and loss of control of the box door after partial damage to the locking components in the existing technology.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: an anti-theft electricity metering box, comprising a box body and a door rotatably connected to the box body, the door being provided with a latch that can extend and retract along its own axis, the box body being provided with a lock box corresponding to the latch, the latch being connected to an elastic pusher mechanism that drives the latch to continuously extend towards the lock box, the lock box being provided with a latch receiving cavity, the latch receiving cavity including a normal receiving area for receiving the extended latch to keep the box door locked, and a break receiving area for accommodating the broken latch when the latch is cut off; the lock box is also provided with a breakage driving mechanism, when the latch is forcibly cut off, the breakage driving mechanism drives the broken latch in the normal receiving area to transfer to the breakage receiving area, and then the elastic pusher mechanism pushes out the subsequent latch into the empty normal receiving area.

[0006] By adopting the above technical solution, when an unscrupulous user attempts to damage the door lock structure by cutting the bolt to open the box door, the broken part of the bolt will remain in the normal receiving area after being cut off. At this time, the bolt breaking drive mechanism immediately transfers the broken bolt to the broken receiving area, and the normal receiving area is then empty. The elastic force continuously applied by the elastic pusher mechanism will push the subsequent intact bolt segment to continue to extend forward and re-enter the normal receiving area, completing the automatic compensation of the bolt and the reset of the box door's locking state. The entire process does not require external signal triggering or manual intervention. The locking structure is rebuilt the instant the bolt is damaged, making it impossible for electricity thieves to open the box door even if they have completed the cutting operation, thus preventing electricity theft, increasing the difficulty and cost of forced entry, extending the box door protection time, and giving maintenance personnel time to respond to electricity theft incidents.

[0007] The above technical solution can be further configured as follows: the tongue breaking drive mechanism includes a number of magnets embedded in the side of the lock box away from the normal receiving area. The magnetic orientation of the magnets in each row and column of the number of magnets is rotated 90° counterclockwise to form a Heilbeck array with a strong magnetic field on one side. The strong magnetic surface of the Heilbeck array is set facing the normal receiving area. When the lock tongue is broken, the strong magnetic field on one side attracts and transfers the broken lock tongue remaining in the normal receiving area to the broken receiving area and fixes it.

[0008] By adopting the above technical solution, a single-sided strong magnetic field structure is formed inside the lock box by a specific arrangement of magnets, with one side having a significantly enhanced magnetic field and the other side having a very weak magnetic field. When a broken lock tongue is present in the normal receiving area, the strong magnetic field acts directly on the broken lock tongue and generates an attraction force much greater than that of ordinary magnets, quickly attracting and transferring it to the broken receiving area. After the broken lock tongue is attracted, it can be firmly attracted and positioned in the broken receiving area without rebounding or shifting, ensuring that the broken lock tongue is completely separated from the normal receiving area, providing an unobstructed passage for the subsequent re-entry of the lock tongue.

[0009] The above technical solution can be further configured as follows: the tongue breaking drive mechanism includes a limiting inclined surface disposed at the position where the normal receiving area and the locking tongue abut. The limiting inclined surface restricts the insertion depth of the locking tongue when the locking tongue is normally inserted. When the locking tongue is broken, the subsequent locking tongue pushed out by the elastic pusher mechanism will push the broken locking tongue remaining in the normal receiving area into the broken receiving area along the limiting inclined surface.

[0010] By adopting the above technical solution, a limiting ramp is set in the normal receiving area so that the bolt is blocked by the ramp after insertion in the normal state and kept in the proper locking position. When the bolt is cut off, the head of the original bolt breaks off and remains in the normal receiving area. At this time, the elastic pusher mechanism pushes the rear bolt forward, and its front end directly presses against the cut end face of the broken bolt. Under the axial pushing force of the subsequent bolt, the broken bolt leaves the normal receiving area along the guiding direction of the limiting ramp and is pushed into the broken receiving area. Then the subsequent bolt continues to move forward until it is blocked by the limiting ramp and occupies the normal receiving area to complete the locking compensation. This pushing process relies entirely on the axial feeding power of the bolt itself and the geometric guidance of the limiting ramp to complete the transfer of the broken bolt. It does not contain any electromagnetic or electronic components, has a simple structure, and is not affected by external temperature, humidity or electromagnetic interference.

[0011] The above technical solution can be further configured as follows: the lock box is also equipped with an alarm device, the alarm device includes a power supply and an alarm connected in series to form a power supply circuit, the power supply circuit is open in the fracture receiving area, the two ends of the open circuit are exposed in the fracture receiving area without contacting each other, and the alarm is located on the side of the lock box away from the strong magnetic surface of the Heilbeck array; when the lock tongue is cut off, the broken lock tongue is attracted by the unilateral strong magnetic field and transferred to the fracture receiving area and fixed, the broken lock tongue simultaneously contacts the two ends of the open circuit, so that the open circuit is connected and triggers the alarm to work.

[0012] By adopting the above technical solution, the alarm circuit forms a normally open break point in the break receiving area. The two electrodes of this break point are exposed and insulated from each other. When the electricity thief cuts the lock tongue, the broken lock tongue is drawn into the break receiving area by the strong magnetic field of the Heilbeck array. At the same time, the broken lock tongue is attracted by the high voltage to the break receiving area and happens to be connected to the two open electrodes, so that the originally disconnected power supply circuit is electrically connected through the broken lock tongue. The alarm immediately turns on and sounds an alarm, and sends an alarm signal to the terminal side. By setting the alarm on the weak magnetic side, the strong magnetic field can avoid interference with the internal magnetic components or electronic circuits of the alarm. The alarm is highly synchronized with the lock body destruction behavior. As long as the lock tongue is broken, the alarm will start. It can warn before the box door is opened and can prevent illegal users from further damaging the meter box to a certain extent.

[0013] The above technical solution can be further configured as follows: the latch includes a telescopic section, a pull-back section, and an installation section connected end to end in sequence; the telescopic section is used to insert into the normal receiving area of ​​the lock box; the elastic pusher mechanism includes a support seat fixedly mounted on the door, the support seat having a support hole, and the installation section slidingly inserted into the support hole along its own axial direction; a first elastic element is sleeved on the installation section, the two ends of the first elastic element respectively abutting against the pull-back section and the support seat, the first elastic element providing an elastic force to drive the latch to extend towards the lock box; a first limiting stop is provided at the end of the installation section away from the pull-back section, the first limiting stop being used to prevent the installation section from slipping out of the support hole.

[0014] By adopting the above technical solution, the elastic pusher mechanism uses the support base as a fixed reference. The mounting section passes through the support hole and sets the entire latch on a track that slides axially. The first elastic element is compressed between the pull-back section and the support base, continuously generating a thrust towards the lock box, ensuring that the telescopic section always has a preload to enter the normal receiving area. When the latch is shortened due to truncation, the first elastic element automatically extends to push the remaining latch portion forward until the telescopic section re-enters the normal receiving area. The first limit stop is located at the end of the mounting section and can abut against the end face of the support base when the latch slides out too much, thereby limiting the maximum extension range of the entire latch and preventing the latch from falling off the support base.

[0015] The above technical solution can be further configured as follows: it also includes a pull-tab mechanism, the pull-tab mechanism including a pull-tab gear rotatably mounted on the door and a drive gear for driving the pull-tab gear to rotate, the pull-tab gear having a pull-tab part, and the pull-back section having at least two pull-back grooves spaced apart, the distance between adjacent pull-back grooves being the same as the length of the telescopic section extending into the normal receiving area, when the pull-tab gear is rotated, the pull-tab part cooperates with the pull-back groove to pull the latch back; the door is provided with a through mounting hole, and the pull-tab mechanism also includes a fixing device. A lock body is placed in the mounting hole, and a lock cylinder is provided inside the lock body. A handle is fixedly connected to one end of the lock cylinder facing the outside of the door. A keyhole communicating with the lock cylinder is opened on the handle. The other end of the lock cylinder is synchronously connected to the drive gear. When no key is inserted into the keyhole, the lock cylinder is locked to the lock body, and the lock cylinder, handle, and drive gear cannot be rotated. When the key is inserted into the keyhole, the lock cylinder is unlocked from the lock body, and the lock cylinder can rotate relative to the lock body. When the handle is turned, the lock cylinder and drive gear rotate synchronously.

[0016] By employing the above technical solution, after the key is inserted into the keyhole to release the lock cylinder from the lock body, turning the handle rotates the lock cylinder, simultaneously driving the drive gear to rotate. The drive gear transmits the rotational motion to the latch gear. During rotation, the latch portion on the latch gear engages in the pull-back groove on the pull-back section and pulls the pull-back groove, causing the entire latch to retract into the doorway against the elastic force of the first elastic element. This disengages the telescopic section from the normal receiving area, completing the unlocking process. After unlocking, removing the key relocks the lock cylinder and lock body, locking the drive gear and handle, preventing the latch from extending during normal door opening. The pull-back section has at least two pull-back grooves, and the distance between adjacent pull-back grooves is the same as the length of the telescopic section extending into the normal receiving area. This ensures that even after the latch is cut off, the latch gear can still engage with the next pull-back groove to pull the latch back. Without the key, the lock cylinder is locked inside the lock body, completely locking the entire drive chain, including the handle, preventing external force from retracting the latch. This technical solution arranges the door lock opening mechanism and the anti-electricity theft automatic compensation mechanism in parallel. During normal unlocking, the pull-tab mechanism forcibly overcomes the pushing force of the elastic push-tab mechanism to perform the unlocking action. After the electricity theft cutting causes the elastic push-tab mechanism to compensate, the pull-tab mechanism can still work normally to open the box door, and the two do not interfere with each other.

[0017] The above technical solution can be further configured as follows: a positioning seat is provided on the outer side of the door, and a movable part that can slide along the direction perpendicular to the surface of the door is provided on the positioning seat. A second elastic element is provided between the movable part and the positioning seat. The second elastic element provides an elastic force to keep the movable part extending away from the door. A guide slope is provided on the side of the movable part facing the handle. A limiting protrusion is provided on the end of the movable part facing the door. A second limiting stop is provided on the positioning seat corresponding to the limiting protrusion. The second limiting stop cooperates with the limiting protrusion to prevent the movable part from disengaging from the positioning seat. When the handle is rotated in the unlocking direction, the end of the handle contacts the guide slope and forces the movable part to retract against the elastic force of the second elastic element. When the handle is rotated to the unlocking position where the latch is fully retracted, the handle completely passes the movable part, and the movable part re-extends under the elastic force, blocking the rotation path of the handle in the direction of the latch extension.

[0018] By adopting the above technical solution, a positioning seat is set on the outside of the door to install a spring-driven movable component. When the user unlocks with a key, the handle rotates from its initial position in the unlocking direction. Its end first contacts the guide slope of the movable component. Guided by the slope, the end of the handle pushes the movable component inward, compressing the second elastic element and retracting it perpendicular to the door, thus clearing the rotation path for the handle. The handle continues to rotate until the latch is fully retracted, i.e., the door is fully unlocked. At this point, the end of the handle has passed the outer end of the movable component. The movable component loses the pressure from the handle end, and the second elastic element quickly resets, pushing the movable component out again. The extended movable component blocks the handle, preventing it from automatically rotating in the locking direction without external force. In other words, the force of the first elastic element pushing the latch out cannot overcome the mechanical obstruction of the handle by the movable component, thus preventing the latch from automatically resetting when the door is opened after unlocking. When the user needs to close the door, they need to actively press the movable part to retract it and remove the obstruction. The latch can then extend under the action of the first elastic element. The cooperation between the limiting protrusion and the second limiting stop ensures that the movable part will not detach from the positioning seat due to excessive popping.

[0019] The beneficial effects of this invention are as follows: The elastic pusher mechanism continuously supplies thrust. Each time the telescopic section is cut off, the broken part is automatically cleared by the break-off drive mechanism, and the subsequent part is automatically connected, forming a resilient defense system that requires constant effort. Even if the lock tongue is damaged, the door cannot be opened normally, making it difficult for electricity thieves to complete subsequent electricity theft operations and increasing the time cost required for forced lock breaking. The moment the lock tongue is cut off, the broken lock tongue is transferred to the breakage receiving area and the alarm circuit is activated. The alarm is triggered during the destructive act rather than after the door is opened, giving maintenance personnel more time to respond. After the lock tongue is forcibly broken off, the broken lock tongue remains in the lock box, forming permanent evidence of damage, which is convenient for investigation and accountability. The strong magnetic surface of the Heilbeck array faces the broken lock tongue, and the weak magnetic surface faces the alarm, which enhances the driving ability of the broken lock tongue while reducing the interference of the magnetic field on the electronic components of the alarm.

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of Example 1; Figure 2 This is a schematic diagram of the door structure in Example 1; Figure 3 This is a cross-sectional view of the lock box in Example 1; Figure 4 This is a schematic diagram of the lock box structure in Example 1; Figure 5 This is a schematic diagram of the mating structure of the positioning seat, movable part, and throttle in Example 2; Figure 6This is a schematic diagram of the positioning seat and movable component in Example 2; Figure 7 This is a schematic diagram of the throttle being restricted by the moving parts in Example 2; Labeling notes: 1. Box body; 2. Box door; 3. Lock tongue; 3. Telescopic section; 31. Pull-back section; 32. Installation section; 33. Pull-back groove; 34. First limit stop edge; 35. Lock box; 4. Lock tongue receiving cavity; 41. Normal receiving area; 42. Broken receiving area; 43. Elastic push tongue mechanism; 5. Support seat; 51. Support hole; 52. First elastic element; 53. Broken tongue drive mechanism; 6. Magnet; 61. Limiting slope; 62. Alarm device; 7. Power supply; 71. Alarm; 72. Open circuit; 73. Pull tongue mechanism; 8. Pull tongue gear; 81. Drive gear; 82. Pull tongue part; 83. Lock body; 84. Lock cylinder; 85. Turn handle; 86. Keyhole; 87. Positioning seat; 9. Moving part; 91. Second elastic element; 92. Guide slope; 93. Limiting protrusion; 94. Second limit stop edge; 95. Detailed Implementation

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below. 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.

[0023] Example 1: As Figures 1 to 4 The anti-theft electricity metering box shown includes the following technology: it includes a box body 1 and a door 2 rotatably connected to the box body 1. The door 2 is provided with a latch 3 that can extend and retract along its own axis. The box body 1 is provided with a lock box 4 corresponding to the latch 3. The latch 3 is connected to an elastic pusher mechanism 5 that drives the latch 3 to extend continuously toward the lock box 4. The lock box 4 is provided with a latch receiving cavity 41. The latch receiving cavity 41 includes a normal receiving area 42 for receiving the extended latch 3 to keep the door 2 locked, and a broken receiving area 43 for accommodating the broken latch when the latch 3 is cut off. The lock box 4 is also provided with a broken latch driving mechanism 6. The broken latch driving mechanism 6 includes several magnets 61 embedded on the side of the lock box 4 away from the normal receiving area 42, and a limiting inclined surface 62 provided at the position where the normal receiving area 42 abuts against the latch 3. The magnetic orientation of the magnets in each row and column of several magnets 61 is rotated 90° counterclockwise to form a Heilbeck array with a strong magnetic field on one side. The strong magnetic surface of the Heilbeck array is set facing the normal receiving area 42. The limiting slope 62 blocks the lock tongue 3 and limits its insertion depth when the lock tongue 3 is normally inserted.

[0024] The lock box 4 is also equipped with an alarm device 7, which includes a power supply 71 connected in series to form a power supply circuit and an alarm 72. The power supply circuit has an open circuit 73 in the break receiving area 43. The two ends of the open circuit 73 are exposed in the break receiving area 43 without contacting each other. The alarm 72 is located on the side of the lock box 4 away from the strong magnetic surface of the Hellbeck array.

[0025] The latch 3 includes a telescopic section 31, a pull-back section 32, and an installation section 33 connected end to end. The telescopic section 31 is used to insert into the normal receiving area 42 of the lock box 4. The elastic pusher mechanism 5 includes a support base 51 fixedly mounted on the door 2. The support base 51 has a support hole 52. The installation section 33 can slide along its own axis through the support hole 52. A first elastic element 53 is sleeved on the installation section 33. The two ends of the first elastic element 53 abut against the pull-back section 32 and the support base 51, respectively. The first elastic element 53 provides an elastic force to drive the latch 3 to extend towards the lock box 4. A first limiting stop 35 is provided at the end of the installation section 33 away from the pull-back section 32. The first limiting stop 35 is used to prevent the installation section 33 from slipping out of the support hole 52.

[0026] The anti-theft electricity metering box also includes a latch mechanism 8, which includes a latch gear 81 rotatably mounted on the box door 2 and a drive gear 82 that drives the latch gear 81 to rotate. The latch gear 81 has a latch part 83, and the pull-back section 32 has at least two pull-back grooves 34 spaced apart. The distance between adjacent pull-back grooves 34 is the same as the length of the telescopic section 31 extending into the normal receiving area 42. When the latch gear 81 is rotated, the latch part 83 cooperates with the pull-back grooves 34 to pull the latch 3 back. The box door 2 has a through mounting hole (not shown in the figure). The latch mechanism 8 also includes a lock body 84 fixedly mounted in the mounting hole. The lock body 84 has a lock cylinder 85 inside. One end of the lock cylinder 85 facing the outside of the box door 2 is fixedly connected to a handle 86. The handle 86 has a keyhole 87 communicating with the lock cylinder 85. The other end of the lock cylinder 85 is synchronously connected to the drive gear 82. When a keyless key is inserted into the keyhole 87, the lock cylinder 85 is locked to the lock body 84, and the lock cylinder 85, the handle 86, and the drive gear 82 cannot be rotated. When a key is inserted into the keyhole 87, the lock cylinder 85 is unlocked from the lock body 84, and the lock cylinder 85 can rotate relative to the lock body 84. When the handle 86 is turned, the lock cylinder 85 and the drive gear 82 rotate synchronously.

[0027] It should be further noted that in this embodiment, the telescopic section 31, the pull-back section 32, and the mounting section 33 of the latch 3 are an integrated component. The material used is a ferromagnetic and highly conductive metal, allowing it to be magnetically attracted by the Hellbeck array to transfer the broken latch, and also to act as a conductor bridging the two ends of the open circuit 73 in the alarm circuit after breakage. It also possesses high hardness to enhance its anti-cutting performance. In this embodiment, the first elastic element 53 is a spring, and the several magnets 61 are neodymium magnets with strong magnetic force.

[0028] The working principle of this embodiment is as follows: In the normal locked state, the first elastic element 53 of the elastic pusher mechanism 5 continuously pushes the latch 3 so that the telescopic section 31 is inserted into the normal receiving area 42 of the lock box 4. The limiting slope 62 restricts the insertion depth of the latch 3 so that it is kept in the proper locking position, and the door 2 is locked.

[0029] When an unauthorized user attempts to break the lock by cutting the latch 3, the latch 3 is severed, and the broken part remains in the normal receiving area 42. At this moment, the strong unilateral magnetic field generated by the Heilbeck array of the latch breaking drive mechanism 6 instantly attracts and transfers the broken latch to the broken receiving area 43. During this process, the limiting inclined surface 62 provides guidance for the broken latch, allowing it to smoothly slide into the broken receiving area 43 along the inclined surface. The broken latch is firmly attracted and positioned in the broken receiving area 43, and at the same time, it contacts both ends of the open circuit 73 of the alarm device 7, making the alarm circuit conductive. The alarm device 72 immediately sounds an alarm and uploads alarm information. Meanwhile, the elastic pusher mechanism 5 continues to push out the remaining intact latch section due to the shortening of the latch 3, allowing the telescopic section 31 to re-enter the empty normal receiving area 42, completing the automatic compensation of the latch 3, and keeping the door 2 locked.

[0030] During normal unlocking, the user inserts the key into the keyhole 87 and turns the handle 86. The lock cylinder 85 unlocks and drives the drive gear 82 to rotate. The drive gear 82 drives the latch gear 81 to rotate, and the latch part 83 on the latch gear 81 engages in the pull-back groove 34 of the pull-back section 32. This pulls the latch 3 to overcome the elastic force of the first elastic element 53 and retracts it. The telescopic section 31 disengages from the normal receiving area 42, and the door 2 can be opened. When closing, the key is removed to lock the lock cylinder 85. Turning the handle 86 in the opposite direction causes the latch 3 to automatically extend under the action of the first elastic element 53, and the telescopic section 31 re-inserts into the normal receiving area 42, completing the locking process.

[0031] Example 2: As Figure 5-7 As shown, the structure in this embodiment is the same as that in Embodiment 1 and will not be described again. The difference between this embodiment and Embodiment 1 is that a positioning seat 9 is provided on the outer side of the door 2. A movable member 91 that can slide along the direction perpendicular to the surface of the door 2 is provided on the positioning seat 9. A second elastic member 92 is provided between the movable member 91 and the positioning seat 9. The second elastic member 92 provides an elastic force to keep the movable member 91 extending away from the door 2. A guide slope 93 is provided on the side of the movable member 91 facing the handle 86. A limiting protrusion 94 is provided on the end of the movable member 91 facing the door 2. A second limiting stop 95 is provided on the positioning seat 9 corresponding to the limiting protrusion 94. The second limiting stop 95 cooperates with the limiting protrusion 94 to prevent the movable member 91 from disengaging from the positioning seat 9. In this embodiment, the second elastic member 92 is a spring.

[0032] The working principle of this embodiment is as follows: During normal unlocking, the user inserts the key into the keyhole 87 and turns the handle 86. The lock cylinder 85 unlocks and drives the drive gear 82 to rotate, which in turn drives the latch gear 81 to rotate. The latch part 83 engages in the pull-back groove 34, pulling the latch 3 back. At the same time, the end of the handle 86 contacts the guide slope 93 of the movable part 91, pushing the movable part 91 inward to compress the second elastic element 92 and retract it. When the handle 86 is turned to the unlocking position where the latch 3 is fully retracted, the handle 86 completely passes the movable part 91. Under the action of the second elastic element 92, the movable part 91 extends again, blocking the rotation path of the handle 86 towards the extension direction of the latch 3. At this time, the force of the first elastic element 53 pushing the latch 3 to extend cannot overcome the mechanical obstruction of the handle 86 by the movable part 91, and the latch 3 will not extend accidentally, allowing the door 2 to be opened smoothly.

[0033] When closing the door, the user manually presses the movable part 91 to retract it, releasing the obstruction to the handle 86. The handle 86 rotates, and the locking tongue 3 automatically extends and re-inserts into the normal receiving area 42 under the action of the first elastic element 53, completing the locking. The cooperation between the limiting protrusion 94 and the second limiting stop 95 ensures that the movable part 91 will not disengage from the positioning seat 9 due to excessive retraction during the pressing process.

[0034] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. An anti-theft electricity metering box, comprising a box body and a door rotatably connected to the box body, characterized in that: The door is equipped with a latch that can extend and retract along its own axis. The body of the box is equipped with a lock box corresponding to the latch. The latch is connected to an elastic pusher mechanism that drives the latch to continuously extend towards the lock box. The lock box is equipped with a latch receiving cavity. The latch receiving cavity includes a normal receiving area for receiving the extended latch to keep the door locked, and a break receiving area for accommodating the broken latch when the latch is cut off. The lock box is also equipped with a breakage driving mechanism. When the latch is forcibly cut off, the breakage driving mechanism drives the broken latch in the normal receiving area to transfer to the breakage receiving area. Then, the elastic pusher mechanism pushes out the subsequent latch into the empty normal receiving area.

2. The anti-theft electricity metering box according to claim 1, characterized in that: The tongue-breaking drive mechanism includes several magnets embedded in the lock box on the side away from the normal receiving area. The magnetic orientation of the magnets in each row and column of the several magnets is rotated 90° counterclockwise to form a Heilbeck array with a strong magnetic field on one side. The strong magnetic surface of the Heilbeck array is set towards the normal receiving area. When the lock tongue is cut off, the strong magnetic field on one side attracts and transfers the broken lock tongue remaining in the normal receiving area to the broken receiving area and fixes it.

3. The anti-theft electricity metering box according to claim 1, characterized in that: The tongue-breaking drive mechanism includes a limiting inclined surface disposed at the position where the normal receiving area and the bolt abut. The limiting inclined surface restricts the insertion depth of the bolt when it is normally inserted. When the bolt is broken, the subsequent bolt pushed out by the elastic pusher mechanism pushes the broken bolt remaining in the normal receiving area into the broken receiving area along the limiting inclined surface.

4. The anti-theft electricity metering box according to claim 2, characterized in that: The lock box is also equipped with an alarm device, which includes a power supply and an alarm connected in series to form a power supply circuit. The power supply circuit has an open circuit in the break receiving area. The two ends of the open circuit are exposed in the break receiving area without contacting each other. The alarm is located on the side of the lock box away from the strong magnetic surface of the Helbeck array. When the lock tongue is cut off, the broken lock tongue is attracted by the unilateral strong magnetic field and transferred to the break receiving area and fixed. The broken lock tongue simultaneously contacts the two ends of the open circuit, making the open circuit conductive and triggering the alarm to work.

5. The anti-theft electricity metering box according to claim 1, characterized in that: The latch includes a telescopic section, a pull-back section, and an installation section connected end to end. The telescopic section is used to insert into the normal receiving area of ​​the lock box. The elastic push-throw mechanism includes a support base fixedly mounted on the door. The support base has a support hole, and the installation section can slide along its own axis through the support hole. A first elastic element is sleeved on the installation section. The two ends of the first elastic element abut against the pull-back section and the support base, respectively. The first elastic element provides an elastic force to drive the latch to extend towards the lock box. A first limiting edge is provided at the end of the installation section away from the pull-back section. The first limiting edge is used to prevent the installation section from slipping out of the support hole.

6. The anti-theft electricity metering box according to claim 5, characterized in that: It also includes a latch mechanism, which comprises a latch gear rotatably mounted on the door and a drive gear that drives the latch gear to rotate. The latch gear has a latch portion, and the pull-back section has at least two pull-back grooves spaced apart. The distance between adjacent pull-back grooves is the same as the length of the telescopic section extending into the normal receiving area. When the latch gear is rotated, the latch portion engages with the pull-back grooves to pull the latch back. The door has a through-hole, and the latch mechanism also includes a lock body fixedly mounted in the mounting hole. The lock body has a lock cylinder, and a handle is fixedly connected to one end of the lock cylinder facing the outside of the door. The handle has a keyhole communicating with the lock cylinder, and the other end of the lock cylinder is synchronously connected to the drive gear. When no key is inserted into the keyhole, the lock cylinder is locked to the lock body, and the lock cylinder, handle, and drive gear cannot rotate. When a key is inserted into the keyhole, the lock cylinder is unlocked from the lock body, and the lock cylinder can rotate relative to the lock body. When the handle is rotated, the lock cylinder and drive gear rotate synchronously.

7. The anti-theft electricity metering box according to claim 6, characterized in that: A positioning seat is provided on the outer side of the door, and a movable part that can slide along the direction perpendicular to the door surface is provided on the positioning seat. A second elastic element is provided between the movable part and the positioning seat. The second elastic element provides an elastic force to keep the movable part extending away from the door. A guide slope is provided on the side of the movable part facing the handle, and a limit protrusion is provided on the end of the movable part facing the door. A second limit stop is provided on the positioning seat corresponding to the limit protrusion. The second limit stop cooperates with the limit protrusion to prevent the movable part from disengaging from the positioning seat. When the handle is turned in the unlocking direction, the end of the handle contacts the guide slope and forces the movable part to retract against the elastic force of the second elastic element. When the handle is turned to the unlocking position where the latch is fully retracted, the handle completely passes the movable part, and the movable part is re-extended by the elastic force, blocking the rotation path of the handle in the direction of the latch extension.

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