A terminal screw anti-loosening device and an electric energy meter

Abstract

The utility model relates to an electric energy meter technical field especially relates to a wiring screw anti -drop device and electric energy meter, a wiring screw anti -drop device, including anticreep buckle, wiring screw and wiring terminal, the shell is connected with the upper cover buckle, a plurality of wiring terminals are arranged on the shell, the wiring hole that is in communication with wiring terminal is opened on the shell, and the conductive pressure plate is arranged on the wiring terminal, the anticreep buckle includes base and jaw, the base is fixedly connected on the upper cover, and the jaw is fixedly connected on the base, and the jaw includes at least one elastic clamping part, the clamping part is arranged in the circumference direction along the head of wiring screw, and after wiring screw is installed to the wiring hole, the outer peripheral surface of screw head portion is abutted or covered. A kind of electric energy meter, including electric energy meter body and above-mentioned a wiring screw anti -drop device, the wiring screw anti -drop device is installed in the end button box area of electric energy meter body. The utility model has solved the problem that traditional electric energy meter wiring screw is prone to accidental drop after loosening.

Description

Technical Field

[0001] This utility model relates to the field of electricity meter technology, and in particular to a wiring screw anti-loosening device and an electricity meter. Background Technology

[0002] A significant technical challenge in the on-site installation and maintenance of existing electricity meters is the tendency for wiring screws to accidentally fall off after being loosened. Because construction sites are often complex environments, potentially involving dust, debris accumulation, or locations at heights or in confined spaces, a fallen screw often requires significant time for workers to locate, impacting efficiency and potentially causing temporary work stoppages due to the inability to find a suitable screw. Currently, the industry standard solution to this problem is to design a slightly smaller diameter raised rib around the screw mounting holes on the outer cover of the terminal box. This rib physically blocks the loosened screw, preventing it from accidentally falling off.

[0003] However, this traditional approach has two limitations: First, if the cross-shaped or slotted thread of the wiring screw strips during installation due to improper handling, this approach cannot quickly replace the damaged screw—the entire meter must be disassembled to complete the replacement, which undoubtedly increases maintenance and time costs. Second, due to the structural relationship between the rib and the cover plate, the screw installation sequence is strictly limited in the production process; the screws must be pre-assembled before the outer cover plate of the terminal box is installed. This largely sacrifices the process flexibility in the production process and restricts the scheduling and adaptability of the production line.

[0004] In order to solve the above-mentioned technical problems, this utility model designs a wiring screw anti-loosening device and an electricity meter. Utility Model Content

[0005] This utility model provides a device to prevent the wiring screw from coming loose, aiming to solve the problem that the wiring screws of traditional energy meters are prone to accidental detachment after loosening. The technical solution is as follows: A device for preventing the detachment of a wiring screw includes a housing, a top cover, an anti-detachment clip, a wiring screw, and a terminal block. The housing is clipped to the top cover. The housing has multiple terminal blocks and wiring holes communicating with the terminal blocks. A voltage-conducting plate is provided on the terminal blocks. The anti-detachment clip includes a base and a claw. The base is fixed to the top cover, and the claw is fixed to the base. The claw includes at least one elastic clamping part, which is arranged circumferentially along the head of the wiring screw and abuts against or covers the outer circumferential surface of the screw head after the wiring screw is installed into the wiring hole.

[0006] Based on the above technical solution, the claw includes two symmetrically arranged arc-shaped elastic pieces, and a circular clamping space is formed between the two elastic pieces to prevent the wiring screw from falling out.

[0007] Based on the above technical solution, the arc-shaped elastic sheet includes a tightening section and a transition section arranged sequentially from top to bottom. The inner diameter of the tightening section is smaller than the inner diameter of the transition section, and the inner diameter of the tightening section is smaller than the outer diameter of the head of the wiring screw.

[0008] Preferably, the wiring screw and the conductive voltage plate are electrically connected or disconnected by the conductive voltage plate moving up and down driven by tightening or loosening the wiring screw.

[0009] An electricity meter includes an electricity meter body and the aforementioned anti-loosening device for wiring screws, wherein the anti-loosening device for wiring screws is installed in the terminal box area of ​​the electricity meter body.

[0010] Based on the above technical solution, the upper cover is an outer cover plate of the end button box, which is provided with a buckle mounting hole that is coaxially aligned with the wiring hole. The anti-detachment buckle is fixed in the buckle mounting hole by ultrasonic welding.

[0011] Beneficial effects Compared with existing technologies, the advantages of this utility model are: 1. By adopting an elastic snap-fit ​​design, it effectively prevents the wiring screw from accidentally falling off when it becomes loose. Even in complex construction environments, such as those with dust, debris accumulation, or in high-altitude or confined spaces, it ensures that the screw will not be lost, thereby improving the fault tolerance and work efficiency of on-site construction. 2. Traditional anti-loosening structures require the screw to be pre-assembled before the outer cover of the end-cap box is installed, which limits the scheduling and adaptability of the production line. However, this utility model, through the elastic deformation of plastic, allows the wiring screw to be installed directly and smoothly from the outside, breaking this fixed limitation, providing greater process flexibility, and helping to optimize the production process and improve the adaptability of the production line. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only one embodiment of this utility model. For those skilled in the art, other embodiments can be derived from the provided drawings without creative effort.

[0013] Figure 1 : A schematic diagram of the structure of the anti-loosening device for wiring screws described in this utility model; Figure 2 : A cross-sectional view of the anti-detachment buckle described in this utility model; Figure 3: A schematic diagram showing the positions of the anti-detachment buckle and the wiring screw described in this utility model; Figure 4 : A schematic diagram of the structure of the electricity meter described in this utility model. Detailed Implementation

[0014] The present invention will be further described below with reference to the accompanying drawings and examples: The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0015] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0016] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0017] like Figure 1 As shown, a wiring screw anti-loosening device includes a housing 1, a top cover 2, an anti-loosening buckle 3, a wiring screw 4, and a wiring terminal 5.

[0018] The housing 1 and the upper cover 2 are connected by a snap-fit ​​connection. This snap-fit ​​connection eliminates the need for additional tools or fasteners, such as screws, to assemble the housing 1 and the upper cover 2. This not only simplifies the installation process but also makes subsequent maintenance and repairs more convenient and efficient.

[0019] The housing 1 is provided with multiple wiring terminals 5, and wiring holes 41 communicating with the wiring terminals 5 are opened on the housing 1. A voltage-conducting plate 51 is provided on the wiring terminals 5. The voltage-conducting plate 51 ensures a more secure and reliable electrical connection between the wire and the energy meter. It provides a larger contact area, which helps to reduce contact resistance and reduce heat generation or power loss problems caused by poor contact.

[0020] The voltage-conducting plate 51 is made of elastic material. The terminal 5 is provided with a groove for accommodating cables. The voltage-conducting plate 51 is disposed in the groove of the terminal 5 and can slide up and down along the groove. One end of the voltage-conducting plate 51 is fixed to the bottom of the base of the terminal 5. The voltage-conducting plate 51 forms a cantilever beam structure. Sliding up and down along the groove refers to the up and down movement of the cantilever end.

[0021] The screw 4 is threaded into the wiring hole 41. When the screw 4 is tightened, it drives the voltage plate 51 to move down and press the external cable. When the screw 4 is loosened, the voltage plate 51 elastically returns to its original position and releases the cable. The cable can be pressed or released simply by tightening or loosening the screw, without the need for complex tools or additional steps, greatly simplifying the installation and maintenance process and improving work efficiency.

[0022] like Figure 2 and Figure 3 As shown, the anti-detachment buckle 3 includes a base 31 and a claw 32. The base 31 is fixed to the upper cover 2, and the claw 32 is fixed to the base 31. The claw 32 includes at least one elastic clamping part, which is arranged circumferentially along the head of the wiring screw 4 and abuts against or covers the outer peripheral surface of the head of the screw 4 after the wiring screw 4 is installed into the wiring hole 41. The anti-detachment buckle 3 can effectively prevent the wiring screw 4 from falling off the electricity meter due to accidental loosening.

[0023] When it is necessary to replace or adjust the wiring screws, the elasticity of the 32 claws allows for removal or installation by applying appropriate external force. This enables quick replacement and maintenance of the wiring screws without disassembling the entire meter, thus improving work efficiency.

[0024] The chuck 32 includes two symmetrically arranged arc-shaped elastic plates, forming a circular clamping space between the two plates to prevent the wiring screw 4 from falling out. This structure can not only accommodate wiring screws of different sizes and specifications, but also ensure that the screw is firmly fixed in place, while allowing a certain range of adjustment to adapt to different application scenarios.

[0025] The jaws 32 are made of plastic. The plastic has a certain degree of elasticity, ensuring that the jaws 32 can clamp and release the wiring screws 4 without damage.

[0026] If higher strength and durability are required, appropriate metallic materials can be selected. For example, spring steel is often used to manufacture various springs and similar components due to its excellent elastic limit and fatigue resistance.

[0027] The arc-shaped elastic sheet includes a tightening section 321 and a transition section 322 arranged sequentially from top to bottom. The inner diameter of the tightening section 321 is smaller than the inner diameter of the transition section 322, and the inner diameter of the tightening section 321 is smaller than the outer diameter of the head of the wiring screw 4.

[0028] The wiring screw 4 and the voltage conductive plate 51 are connected or disconnected by tightening or loosening the wiring screw 4 to drive the voltage conductive plate 51 to move up and down.

[0029] To further enhance safety, the inner surface end of the tightening section 321 is provided with a guide bevel to guide the wiring screw 4 during installation or removal. The guide bevel guides the wiring screw to pass smoothly during installation or removal.

[0030] The height of the tightening section 321 is one-third of the total height of the arc-shaped elastic sheet, and the inner wall of the tightening section 321 is provided with anti-slip texture. This helps to increase friction and prevent the screw from accidentally loosening under vibration or other conditions.

[0031] like Figure 4 As shown, an electricity meter includes an electricity meter body 6 and the aforementioned anti-loosening device for wiring screws, wherein the anti-loosening device for wiring screws is installed in the terminal box area of ​​the electricity meter body 6.

[0032] The upper cover 2 is the outer cover of the terminal box, and it has a snap-fit ​​mounting hole coaxially aligned with the wiring hole 41. The anti-disengagement snap 3 is fixed in the snap-fit ​​mounting hole by ultrasonic welding. The design of integrating the anti-disengagement device into the terminal box area makes the entire energy meter structure more compact and reasonable. This saves space and does not affect the function or layout of other components, which helps to achieve a smaller and lighter product design.

[0033] In use, the housing 1 and the top cover 2 of the electricity meter are fixed together by snap-fit ​​connections. The housing 1 has multiple wiring terminals 5, each equipped with a voltage-conducting plate 51. The top cover 2 has snap-fit ​​mounting holes coaxially aligned with the wiring holes 41, and anti-detachment snap-fits 3 are fixed within these mounting holes by ultrasonic welding or other methods.

[0034] When wiring is required, the external cable enters the slot in terminal 5. The voltage-conducting plate 51, made of elastic material, is located within the slot and can slide up and down along it. At this time, the voltage-conducting plate 51 is in its natural state, allowing the cable to be easily inserted.

[0035] Next, screw the wiring screw 4 into the wiring hole 41. As the wiring screw is gradually tightened, it pushes the conductive plate 51 downward, pressing the cable located in the groove to achieve electrical connection. At the same time, the claws 32 on the anti-dislodgement latch 3 surround the head of the wiring screw 4. The claws 32 include at least one elastic clamping part, which is arranged circumferentially along the head of the wiring screw and abuts against or covers the outer peripheral surface of the screw head to ensure that the wiring screw will not accidentally fall off even if it becomes loose.

[0036] When it is necessary to replace or adjust the cable, simply rotate the wiring screw 4 in the reverse direction, and the conductive plate 51 will return to its original position with the help of its own elasticity, releasing the cable. Due to the presence of the anti-dislodgement clip 3, even if the wiring screw 4 is completely loosened, it will be restrained in its original position by the claw 32, and will not fall to a place that is difficult to retrieve, thereby improving the fault tolerance and work efficiency of on-site construction.

[0037] The present invention has been described above by way of example, but the present invention is not limited to the specific embodiments described above. Any modifications or variations made based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A wire screw anti-loosening device, characterized by: The device includes a housing (1), a top cover (2), an anti-disengagement buckle (3), a wiring screw (4), and a wiring terminal (5). The housing (1) is snapped together with the top cover (2). Multiple wiring terminals (5) are provided on the housing (1). A wiring hole (41) communicating with the wiring terminal (5) is opened on the housing (1). A voltage-conducting plate (51) is provided on the wiring terminal (5). The anti-disengagement buckle (3) includes a base (31) and a claw (32). The base (31) is fixed to the top cover (2). The claw (32) is fixed to the base (31). The claw (32) includes at least one elastic clamping part. The clamping part is arranged circumferentially along the head of the wiring screw (4) and abuts against or covers the outer circumferential surface of the head of the wiring screw (4) after the wiring screw (4) is installed into the wiring hole (41).

2. The anti-loosening device for wiring screws according to claim 1, characterized in that: The claw (32) includes two symmetrically arranged arc-shaped elastic pieces, and a circular clamping space is formed between the two elastic pieces to prevent the wiring screw (4) from falling off.

3. The anti-loosening device for wiring screws according to claim 2, characterized in that: The arc-shaped elastic sheet includes a tightening section (321) and a transition section (322) arranged sequentially from top to bottom. The inner diameter of the tightening section (321) is smaller than the inner diameter of the transition section (322), and the inner diameter of the tightening section (321) is smaller than the outer diameter of the head of the wiring screw (4).

4. The anti-loosening device for wiring screws according to claim 2, characterized in that: The wiring screw (4) and the voltage plate (51) are connected or disconnected by the voltage plate (51) moving up and down by tightening or loosening the wiring screw (4) to the external cable.

5. The anti-loosening device for wiring screws according to claim 4, characterized in that: The voltage-conducting plate (51) is made of elastic material, and a sliding groove is provided in the terminal (5). The voltage-conducting plate (51) is slidably connected to the sliding groove.

6. The anti-loosening device for wiring screws according to claim 3, characterized in that: The inner surface end of the tightening section (321) is provided with a guide bevel for guiding the wiring screw (4) during installation or disassembly.

7. A terminal screw anti-loosening device according to claim 6, characterized in that: The height of the tightening section (321) accounts for one-third of the total height of the arc-shaped elastic sheet.

8. The anti-loosening device for wiring screws according to claim 2, characterized in that: The claw (32) is made of plastic.

9. An electricity meter, characterized in that, The device includes an electricity meter body (6) and a wiring screw anti-loosening device according to any one of claims 1 to 8, wherein the wiring screw anti-loosening device is installed in the terminal box area of ​​the electricity meter body (6).

10. An electricity meter according to claim 9, characterized in that: The upper cover (2) is the outer cover of the end button box, and it is provided with a buckle mounting hole that is coaxially aligned with the wiring hole (41). The anti-detachment buckle (3) is fixed in the buckle mounting hole by ultrasonic welding.

Images