Anti-theft electric energy metering box

CN224923248UActive Publication Date: 2026-10-30ZHEJIANG DENGRAN ELECTRIC POWER TECH CO LTD
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Patent Information

Application Number
CN202621514129.9
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2026-09-24
Publication Date
2026-10-30
Estimated Expiration
2036-09-24

AI Technical Summary

Technical Problem

[0004]本实用新型的目的在于提供一种防盗电能计量箱,通过设置防盗组件,具体是该锁止结构件设置在箱体与箱门之间,通过解锁件方可带动锁杆旋转,锁止杆切换为竖直姿态后可经由开口脱离锁止圆形框架,实现箱门开启,关闭时锁止杆进入锁止圆形框架内部,配合解锁件驱动锁止块复位插接锁止槽,该组件不仅通过箱门将锁止结构件进行隐藏,降低暴力破坏锁止结构件实现开启的可能性,同时,在没有解锁的情况下,箱门难以被开启,整套锁止构件收纳于箱门内侧,解决了传统电能计量箱大多将锁件布置于箱体外部,锁芯、锁舌等锁止构件直接暴露在箱体外侧,锁件缺少遮挡防护,容易受到暴力敲击、剪切、撬拨等外力作用,不法人员可通过非常规撬盗手段直接损毁外露锁件,锁止机构失效后即可打开箱门实施窃电操作,难以对各类窃电行为形成有效阻隔的问题

Benefits of technology

1、本实用新型通过设置防盗组件,具体是该锁止结构件设置在箱体与箱门之间,通过解锁件方可带动锁杆旋转,锁止杆切换为竖直姿态后可经由开口脱离锁止圆形框架,实现箱门开启,关闭时锁止杆进入锁止圆形框架内部,配合解锁件驱动锁止块复位插接锁止槽,该组件不仅通过箱门将锁止结构件进行隐藏,降低暴力破坏锁止结构件实现开启的可能性,同时,在没有解锁的情况下,箱门难以被开启,整套锁止构件收纳于箱门内侧,依靠解锁件完成解锁操作,全部采用机械传动构件,适配计量箱的锁闭使用工况。

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Abstract

The utility model discloses an anti -theft electric energy metering box relates to electric energy metering box technical field, the utility model discloses a box body, the front surface of box body inside is inserted with the door, still include protection mechanism, the utility model discloses a theftproof subassembly is set up, specifically is this locking structure spare setting between box body and door, can drive the rotation of lock bar through the unlocking spare, and the locking rod switches for vertical posture can be separated from the locking circular frame through the opening, realizes the door opening, and the locking rod enters the inside of locking circular frame when closing, and the unlocking spare drives locking block reset and inserts locking groove, this subassembly not only hides locking structure spare through the door, reduces the possibility of violent destruction locking structure spare and realizes the opening, and under the condition of not unlocking, the door is difficult to be opened, and the whole locking component is stored in the inboard of the door, and the unlocking operation is completed by relying on the unlocking spare, and all adopt mechanical transmission component, and the locking use working condition of adapting metering box.
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Description

Technical Field

[0001] This utility model belongs to the technical field of electricity metering boxes, and in particular relates to an anti-theft electricity metering box. Background Technology

[0002] Electricity metering boxes are indispensable basic supporting equipment in power supply systems. They are widely used in various electricity consumption scenarios such as residential buildings, commercial buildings, industrial plants, and outdoor distribution substations. They are mainly used to encapsulate metering components such as electricity meters, terminals, and monitoring modules. They undertake core functions such as electricity metering, electricity data collection, line protection, and power distribution safety management. Their operational stability, security, and anti-theft features are directly related to the accuracy of electricity metering, the standardization of power supply and consumption, and the safety of power grid operation. They are key equipment to ensure accurate billing by power companies, maintain fairness in electricity consumption, and avoid electrical safety accidents.

[0003] Traditional electricity metering boxes mostly place the locks on the outside of the box, with the lock cylinder, bolt, and other locking components directly exposed on the outside of the box. The locks lack protection and are easily subjected to external forces such as violent knocking, shearing, and prying. Criminals can directly damage the exposed locks through unconventional prying methods. Once the locking mechanism fails, the box door can be opened to steal electricity, making it difficult to effectively prevent various types of electricity theft. Therefore, a new anti-theft electricity metering box is proposed. Utility Model Content

[0004] The purpose of this utility model is to provide an anti-theft electricity metering box. Specifically, the anti-theft component is located between the box body and the door. The locking mechanism allows the locking rod to rotate via an unlocking device. When the locking rod is in a vertical position, it can disengage from the circular locking frame through an opening, allowing the door to open. When closed, the locking rod enters the circular locking frame, and the unlocking device drives the locking block to reset and engage with the locking groove. This component not only conceals the locking mechanism through the door, reducing the possibility of forced entry, but also makes the door difficult to open without unlocking. The entire locking system is housed inside the door, solving the problem that traditional electricity metering boxes often have locks located outside the box body, with the lock cylinder, bolt, and other locking components directly exposed. These locks lack protection and are easily subjected to forceful impacts, shearing, prying, etc., allowing unscrupulous individuals to damage the exposed locks using unconventional methods. Once the locking mechanism fails, the door can be opened to steal electricity, making it difficult to effectively prevent various forms of electricity theft.

[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution: This utility model relates to an anti-theft electricity metering box, comprising a box body with a door inserted into the front of the box body, and a protective mechanism installed on the box body and door. The protective mechanism includes an anti-theft component, which is also installed on the box body and door. The anti-theft component includes a locking circular frame fixed to the bottom of the inner side wall of the box body. The top of the locking circular frame has an opening, and a limit plate is fixedly connected to the inner ring of the locking circular frame. A locking rod is rotatably connected to the bottom of the inside of the door, and the locking rod passes through the door and... Extending to the inside of the box, a locking rod is fixedly connected to the outer surface of the locking rod. The outer surface of the locking rod is inserted into the inside of the locking circular frame. The bottom of the locking rod contacts the top of the limiting plate. A locking groove is opened on the back of the locking circular frame. A locking block is inserted into the locking groove. A push rod is fixedly connected to the front of the locking block. A through hole is opened on the back inside the locking rod. The outer surface of the push rod is slidably connected to the inside of the through hole. An unlocking component is installed on the locking rod. An elastic component is installed on the back of the box door. The locking rod is initially set horizontally.

[0006] Furthermore, the protective mechanism also includes an anti-tampering component, which is installed on the enclosure and the enclosure door. The anti-tampering component includes a through groove opened on the top of the enclosure, and the outer surface of the enclosure door is slidably connected to the inside of the through groove.

[0007] Furthermore, T-shaped guide grooves are provided on the left and right sides of the inner wall of the box, and T-shaped guide strips are fixedly connected to the left and right sides of the box door. The outer surfaces of the two T-shaped guide strips are slidably connected to the inside of the T-shaped guide grooves. Pin holes are provided at the bottom of the left and right sides of the box door. Cavities are provided at the four corners of the front of the box, and the components connected to the four cavities are the same.

[0008] Furthermore, a spring is fixedly connected to the inner wall of the cavity, and a locking bead is fixedly connected to the end of the spring away from the inner wall of the cavity. The locking bead penetrates the cavity and extends into the T-shaped guide groove. The end of the locking bead away from the spring is inserted into the pin hole. When the door moves upward to open, the two locking bead at the top are inserted into the pin hole. When the door moves downward to close, the two locking bead at the bottom are inserted into the pin hole.

[0009] Furthermore, the unlocking component includes a lock hole on the front of the lock rod, into which a key is inserted. The inner ring of the through hole has several limiting grooves, and the outer ring of the push rod has several limiting protrusions. The interior of each of the limiting grooves is slidably connected to the outer surface of the limiting protrusion. A connecting rod is fixedly connected to the front of the push rod, and the front of the connecting rod contacts the back of the key. A spring is sleeved on the outside of the connecting rod, and the front of the spring is fixedly connected to the front of the inner wall of the through hole. A limiting ring is fixedly connected to the back of the spring, and the center of the limiting ring is fixedly connected to the outer surface of the connecting rod.

[0010] Furthermore, the elastic element includes a limiting sleeve fixed to the back of the door, the limiting sleeve being sleeved on the outside of the locking rod, and a worm gear fixedly connected to the inner ring of the limiting sleeve, the inner end of the worm gear being fixedly connected to the outer ring of the locking rod.

[0011] This utility model has the following beneficial effects: 1. This utility model incorporates an anti-theft component, specifically a locking structure positioned between the box body and the box door. The locking rod can only be rotated via an unlocking mechanism. After the locking rod switches to a vertical position, it can disengage from the locking circular frame through an opening, allowing the box door to open. When closed, the locking rod enters the locking circular frame, cooperating with the unlocking mechanism to drive the locking block to reset and engage with the locking groove. This component not only conceals the locking structure within the box door, reducing the possibility of forced entry, but also makes the box door difficult to open without unlocking. The entire locking mechanism is housed inside the box door, relying on the unlocking mechanism for unlocking. All components utilize mechanical transmission, making it suitable for the locking and operation of metering boxes.

[0012] 2. This utility model improves structural robustness by incorporating anti-tampering components, specifically allowing the door to slide vertically, thus eliminating the need for traditional hinge connections. Springs inside the cavity apply force to the locking mechanism, with two sets of locking mechanisms corresponding to the door's opening and closing positions, facilitating door positioning. The vertical sliding motion of the door does not obstruct operators from inspecting and maintaining the interior of the box. The box body adopts a one-piece molded structure, and the sliding assembly method changes the force distribution on the door. Working in conjunction with the anti-theft components, all components are arranged inside the box, allowing it to withstand external disturbances and adapting to the long-term operating conditions of the electricity metering box.

[0013] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, 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 this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the overall structure of the cabinet door of this utility model; Figure 3 This utility model Figure 2 A magnified structural diagram of A in the middle; Figure 4This is a schematic diagram of the exploded structure of the anti-theft component of this utility model; Figure 5 This is a schematic diagram of the cross-sectional structure of the locking rod of this utility model; Figure 6 This utility model Figure 5 A magnified structural diagram of B in the diagram.

[0016] The attached diagram lists the components represented by each number as follows: 111. Box body; 112. Box door; 2. Protective mechanism; 21. Anti-theft component; 211. Locking circular frame; 212. Opening; 213. Limiting plate; 214. Locking rod; 215. Locking rod; 216. Lock hole; 217. Key; 218. Limiting sleeve; 219. Spiral coil; 210. Locking groove; 2111. Locking block; 2112. Push rod; 2113. Limiting protrusion; 2114. Limiting slide groove; 2115. Connecting rod; 2116. Limiting ring; 2117. Spring 1; 2118. Through hole; 22. Anti-tamper component; 221. Through groove; 222. T-shaped guide strip; 223. Pin hole; 224. T-shaped guide slide groove; 225. Cavity; 226. Spring; 227. Locking bead. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0018] Please see Figures 1-6As shown, this utility model is an anti-theft electricity metering box, including a box body 111, a box door 112 inserted into the front of the inside of the box body 111, and a protective mechanism 2. The protective mechanism 2 is installed on the box body 111 and the box door 112. The protective mechanism 2 includes an anti-theft component 21, which is installed on the box body 111 and the box door 112. The anti-theft component 21 includes a locking circular frame 211 fixed to the bottom of the inner side wall of the box body 111. The locking circular frame 211 has an opening 212 on the top of its outer surface. 1. A limiting plate 213 is fixedly connected to the inner ring. A locking rod 215 is rotatably connected to the bottom of the inside of the door 112. The locking rod 215 passes through the door 112 and extends to the inside of the box body 111. A locking rod 214 is fixedly connected to the outer surface of the locking rod 215. The outer surface of the locking rod 214 is inserted into the inside of the locking circular frame 211. The bottom of the locking rod 214 contacts the top of the limiting plate 213. A locking groove 210 is opened on the back of the locking circular frame 211. A locking block 2111 is inserted into the locking groove 210. The front of the locking block 2111 is fixed. A push rod 2112 is connected to the locking rod 215, and a through hole 2118 is provided on the back of the locking rod 215. The outer surface of the push rod 2112 is slidably connected to the inside of the through hole 2118. An unlocking component is installed on the locking rod 215, and an elastic component is installed on the back of the door 112. The locking rod 214 is initially set horizontally. This locking structure is located between the box body 111 and the door 112. The locking rod 215 can be rotated by the unlocking component. After the locking rod 214 switches to a vertical position, it can disengage from the locking circular frame 211 through the opening 212, realizing the lock. When the door 112 is opened, the locking rod 214 enters the locking circular frame 211 when closed, and works with the unlocking component to drive the locking block 2111 to reset and insert into the locking groove 210. This component not only hides the locking structure through the door 112, reducing the possibility of opening by violently damaging the locking structure, but also makes it difficult to open the door 112 without unlocking. The entire locking component is stored inside the door 112 and the unlocking operation is completed by the unlocking component. All components are mechanically driven and are suitable for the locking and use conditions of the metering box.

[0019] The protective mechanism 2 also includes an anti-tamper component 22, which is installed on the housing 111 and the door 112. The anti-tamper component 22 includes a through groove 221 on the top of the housing 111, and the outer surface of the door 112 is slidably connected to the inside of the through groove 221. T-shaped guide grooves 224 are provided on the left and right sides of the inner wall of the housing 111, and T-shaped guide strips 222 are fixedly connected to the left and right sides of the door 112. The outer surfaces of the two T-shaped guide strips 222 are... Each component is slidably connected to the interior of the T-shaped guide groove 224. Pin holes 223 are provided at the bottom left and right sides of the door 112. Cavities 225 are provided at the four corners of the front of the box body 111. The components connected to the four cavities 225 are identical. A spring 226 is fixedly connected to the inner wall of each cavity 225. A locking bead 227 is fixedly connected to the end of the spring 226 away from the inner wall of the cavity 225. The locking bead 227 passes through the cavity 225 and extends into the interior of the T-shaped guide groove 224. The end of the latch 227 away from the spring 226 is inserted into the pin hole 223. When the door 112 moves upward to open, the two latches 227 at the top are inserted into the pin hole 223. When the door 112 moves downward to close, the two latches 227 at the bottom are inserted into the pin hole 223. The door 112 moves up and down horizontally, abandoning the traditional hinge connection form, thus improving the structural robustness. The spring 226 inside the cavity 225 applies force to the latches 227. The two sets of latches 227 correspond to the opening and closing positions of the door 112, which facilitates the fixation of the door 112. The vertical horizontal movement of the door 112 will not hinder the operator from inspecting and maintaining the inside of the box 111. The box 111 adopts an integrated molding structure, and the sliding assembly method changes the force form of the door. It works in conjunction with the anti-theft component 21. All components are arranged inside the box, which can withstand external disturbances and is suitable for the long-term operating conditions of the power metering box.

[0020] The unlocking component includes a lock hole 216 on the front of the lock rod 215, a key 217 inserted into the lock hole 216, a number of limiting grooves 2114 on the inner ring of the through hole 2118, a number of limiting protrusions 2113 on the outer ring of the push rod 2112, the interior of the number of limiting grooves 2114 being slidably connected to the outer surface of the limiting protrusions 2113 respectively, a connecting rod 2115 fixedly connected to the front of the push rod 2112, the front of the connecting rod 2115 contacting the back of the key 217, a spring 2117 sleeved on the outside of the connecting rod 2115, the front of the spring 2117 being fixedly connected to the front of the inner wall of the through hole 2118, a limiting ring 2116 fixedly connected to the back of the spring 2117, and the center of the limiting ring 2116 being fixedly connected to the outer surface of the connecting rod 2115.

[0021] The elastic element includes a limiting sleeve 218 fixed to the back of the door 112. The limiting sleeve 218 is sleeved on the outside of the locking rod 215. A worm gear 219 is fixedly connected to the inner ring of the limiting sleeve 218. The inner end of the worm gear 219 is fixedly connected to the outer ring of the locking rod 215.

[0022] A specific application of this embodiment is as follows: In use, the box body 111 is an integrally formed component. The T-shaped guide strips 222 on both sides of the box door 112 are assembled inside the T-shaped guide grooves 224 of the box body 111. The T-shaped guide strips 222 and the T-shaped guide grooves 224 form a vertical sliding pair, and the box door 112 can complete the translational movement in the vertical direction. Cavities 225 are opened at the four corners of the box body 111. Springs 226 and locking bolts 227 are assembled inside the cavities 225. The locking bolts 227 can be inserted into the T-shaped guide grooves 224 under the elastic force of the springs 226. The locking bolts 227 are inserted into the pin holes 223 on the side of the box door 112. When the box door 112 moves upward and opens, it is limited by the two sets of locking bolts 227 at the top. When the box door 112 moves downward and closes, it is limited by the two sets of locking bolts 227 at the bottom. When opening the door 112, the key 217 is fully inserted into the lock hole 216, with the back of the key 217 against the connecting rod 2115, pushing the connecting rod 2115 to move towards the back of the lock rod 215. The connecting rod 2115 drives the limiting ring 2116 and the push rod 2112 to move backward simultaneously. The limiting protrusion 2113 on the outer ring of the push rod 2112 slides along the limiting groove 2114 inside the through hole 2118. The push rod 2112 drives the locking block 2111 to disengage from the locking groove 210, releasing the circumferential limitation of the locking block 2111 on the lock rod 215. During the backward movement of the connecting rod 2115, the limiting ring 2116 applies a pulling force to the spring 2117, and the spring 2117 undergoes tensile deformation to complete the storage of force. At this time, turn the key 217. The key 217 drives the locking rod 215 to rotate synchronously. The locking rod 215 rotates inside the limiting sleeve 218. The locking rod 215 applies a torsional force to the worm gear 219. The worm gear 219 deforms and stores energy. The locking rod 215 drives the locking rod 214 fixed on the outside to rotate synchronously. The locking rod 214 rotates from the initial horizontal state to the vertical state. The locking rod 214 can pass upward from the opening 212 at the top of the locking circular frame 211, lifting the box door 112. The T-shaped guide strip 222 slides upward along the T-shaped guide groove 224. The locking rod 214 moves upward with the box door 112, disengaging from the inside of the locking circular frame 211. The box door 112 moves upward along the through groove 221 at the top of the box body 111, realizing the opening of the box door 112. The box door 112 stores the locking circular frame 211, locking rod 215 and other locking structures inside the box body. When closing the cabinet door 112, move the cabinet door 112 downwards, allowing the locking rod 214 to enter the inner cavity of the locking circular frame 211 through the opening 212. Turn the key 217, causing the locking rod 215 to rotate, adjusting the locking rod 214 to its initial horizontal position. Release the key 217, and the worm gear 219 releases its torsional deformation force, causing the locking rod 215 to rotate. The locking rod 214 remains horizontally level, with its bottom resting on the upper surface of the limiting plate 213. The position plate 213 cooperates with the opening 212 to form an upward position constraint on the locking rod 214. When the key 217 is pulled out, the spring 2117 releases its tensile deformation, pushing the push rod 2112 forward. The locking block 2111 is reinserted into the locking groove 210, restoring the circumferential limit of the locking rod 215 and completing the locking of the door 112. After the door 112 moves down to the position, the locking bead 227 at the bottom position engages with the pin hole 223, forming a position positioning for the closed door 112.

[0023] 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 present invention. In this specification, the 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.

[0024] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the present utility model 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 present utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A theft-proof electricity metering box, comprising a box body (111), wherein a box door (112) is inserted into the front of the interior of the box body (111), characterized in that, Also includes: A protective mechanism (2) is installed on the box body (111) and the box door (112); the protective mechanism (2) includes an anti-theft component (21), which is installed on the box body (111) and the box door (112); The anti-theft component (21) includes a locking circular frame (211) fixed to the bottom of the inner wall of the box (111). The locking circular frame (211) has an opening (212) on its top. A limiting plate (213) is fixedly connected to the inner ring of the locking circular frame (211). A locking rod (215) is rotatably connected to the bottom of the inside of the box door (112). The locking rod (215) passes through the box door (112) and extends to the inside of the box (111). A locking rod (214) is fixedly connected to the outer surface of the locking rod (215). The outer surface of the locking rod (214) is connected to the locking circular frame (211). 11) Internal insertion: The bottom of the locking rod (214) contacts the top of the limiting plate (213). The back of the locking circular frame (211) is provided with a locking groove (210). A locking block (2111) is inserted into the locking groove (210). A push rod (2112) is fixedly connected to the front of the locking block (2111). A through hole (2118) is provided on the back of the inside of the locking rod (215). The outer surface of the push rod (2112) is slidably connected to the inside of the through hole (2118). An unlocking component is installed on the locking rod (215). An elastic component is installed on the back of the box door (112). The locking lever (214) is initially set horizontally.

2. The anti-theft electricity metering box according to claim 1, characterized in that, The protective mechanism (2) further includes an anti-dismantling component (22), which is installed on the housing (111) and the door (112); The anti-tamper component (22) includes a through slot (221) on the top of the housing (111). The outer surface of the door (112) is slidably connected to the inside of the through groove (221).

3. The anti-theft electricity metering box according to claim 2, characterized in that, T-shaped guide grooves (224) are provided on the left and right sides of the inner wall of the box (111), and T-shaped guide strips (222) are fixedly connected to the left and right sides of the box door (112). The outer surfaces of the two T-shaped guide strips (222) are slidably connected to the inside of the T-shaped guide grooves (224).

4. The anti-theft electricity metering box according to claim 3, characterized in that, The bottom left and right sides of the door (112) are provided with pin holes (223), and the four corners of the front of the box body (111) are provided with cavities (225). The four cavities (225) are connected to the same components.

5. The anti-theft electricity metering box according to claim 4, characterized in that, A spring (226) is fixedly connected to the inner wall of the cavity (225). A locking bead (227) is fixedly connected to one end of the spring (226) away from the inner wall of the cavity (225). The locking bead (227) penetrates the cavity (225) and extends into the T-shaped guide groove (224). The end of the locking bead (227) away from the spring (226) is inserted into the pin hole (223). When the door (112) moves upward to open, the two latches (227) at the top are inserted into the pin hole (223). When the door (112) moves downward to close, the two latches (227) at the bottom are inserted into the pin hole (223).

6. The anti-theft electricity metering box according to claim 1, characterized in that, The unlocking component includes a lock hole (216) on the front of the lock bar (215), a key (217) is inserted into the lock hole (216), a number of limiting grooves (2114) are provided in the inner ring of the through hole (2118), and a number of limiting protrusions (2113) are provided in the outer ring of the push rod (2112). The interior of the number of limiting grooves (2114) is slidably connected to the outer surface of the limiting protrusions (2113).

7. The anti-theft electricity metering box according to claim 6, characterized in that, The push rod (2112) is fixedly connected to the front of the connecting rod (2115). The front of the connecting rod (2115) contacts the back of the key (217). A spring (2117) is sleeved on the outside of the connecting rod (2115). The front of the spring (2117) is fixedly connected to the front of the inner wall of the through hole (2118). A limit ring (2116) is fixedly connected to the back of the spring (2117). The center of the limit ring (2116) is fixedly connected to the outer surface of the connecting rod (2115).

8. The anti-theft electricity metering box according to claim 1, characterized in that, The elastic element includes a limiting sleeve (218) fixed to the back of the door (112). The limiting sleeve (218) is sleeved on the outside of the locking rod (215). A worm gear (219) is fixedly connected to the inner ring of the limiting sleeve (218). The inner end of the worm gear (219) is fixedly connected to the outer ring of the locking rod (215).