An electricity meter detection device
By using a push spring to support the conductive terminal so that it can be inserted into the meter wiring socket in a non-energized state, and by utilizing the surface-to-surface contact design between the conductive cap and the conductive ring, the problem of arc erosion caused by tip discharge during multiple energized connection processes of the terminal connector is solved, thus achieving accurate, reliable and stable meter detection.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- DONGTAI BAICAI TECH CO LTD
- Filing Date
- 2026-03-10
- Publication Date
- 2026-06-09
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
In existing electricity meter testing devices, the terminal connectors are eroded by electric arcs caused by tip discharge during repeated live connection processes. This leads to oxidation of the pin surface, forming additional contact resistance, which causes current and voltage sampling jumps. As a result, the current of the meter under test is inconsistent with that of the standard meter, and the test results are distorted.
A meter testing device was designed, which uses a push spring to support the conductive terminal so that it is inserted into the meter wiring socket in a non-energized state. The meter is pushed by a push unit to connect the circuit of the switching component, ensuring that the conductive terminal is always de-energized during the insertion process, avoiding tip discharge and arc erosion. The surface-to-surface contact design between the conductive cap and the conductive ring reduces the instability of the contact resistance.
It effectively eliminates tip discharge and arc erosion, avoids oxidation of conductive terminal surfaces to form additional contact resistance, ensures stable current and voltage sampling, and provides accurate and reliable metering error detection and accurate test results.
Smart Images
Figure CN122172102A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of electricity meter testing technology, specifically to an electricity meter testing device. Background Technology
[0002] As the core instrument for electricity metering, the accuracy of electricity meters directly affects the fairness of electricity trade settlement. Therefore, they must undergo rigorous metering error testing before leaving the factory. The current testing device mainly consists of a meter holder, an automatic crimping mechanism, and current and voltage terminal connectors (hereinafter referred to as "terminal connectors"). The meter holder is responsible for temporarily positioning the meter to be tested at a preset position on one side of the terminal connector. Then, the automatic crimping mechanism drives the meter holder to move towards the terminal connector, so that the meter's wiring socket is precisely connected to the terminal connector. Power is then supplied to the meter through the terminal connector, and the metering error detection is completed.
[0003] However, in large-scale continuous testing operations, the pins of terminal connectors frequently exhibit blackening and burning, becoming a key bottleneck affecting testing reliability. The mechanism is as follows: because the terminal connectors are in a energized standby state for extended periods, when they connect to different meters, point discharge and arcing can easily occur between the pins and sockets. The instantaneous high temperature of the arc (reaching thousands of degrees Celsius) melts and instantly oxidizes the metal on the pin surface, forming a black metal oxide layer. This oxide layer has significant negative effects: firstly, it acts as an additional contact resistance in the testing circuit, causing the actual applied current to deviate from the set value; secondly, it causes random fluctuations in current and voltage sampling values, resulting in inconsistencies between the tested meter and the standard meter, ultimately leading to systematic distortion of the calibration results, misclassifying qualified meters as unqualified, and severely impacting testing efficiency and factory quality control. Summary of the Invention
[0004] The purpose of this invention is to provide a meter testing device that solves the problem that during repeated live connection of terminal connectors, arcing caused by tip discharge leads to oxidation of the pin surface, resulting in additional contact resistance. This causes current and voltage sampling jumps, inconsistencies between the current of the meter under test and the standard meter, and ultimately leads to distorted test results.
[0005] To achieve the above objectives, the present invention provides the following technical solution: an electricity meter testing device, comprising: Control panel; and The meter holder is movably mounted on one side of the control panel for positioning and clamping the electricity meter. A push unit is provided on the back of the control panel to control the meter holder to move in a preset direction. The terminal connector mechanism is fixedly mounted on one side of the operating table. The terminal connector mechanism has multiple pin assemblies on the side near the meter rack. The pushing unit pushes the meter held by the meter rack so that the meter's wiring socket is movably connected to the pin assembly. The pin assembly includes a pin seat fixedly disposed on one side of the terminal insertion mechanism. The pin seat has a pin post at its outer end, and an elastic member at one end of the pin post. A pin sleeve is movably fitted on the outer surface of the pin post. A switch member is disposed between the pin sleeve and the pin post. A conductive terminal is disposed at one end of the pin sleeve. Under normal conditions, the elastic member elastically supports the pin sleeve at the upper end of the pin post. When the meter is moved by the pushing unit, the elastic member can support the conductive terminal to be inserted into the wiring socket of the meter. The switch member is in an open circuit state during the insertion of the conductive terminal into the wiring socket of the meter and outputs power to the conductive terminal after the insertion process is completed.
[0006] As a further description of the above technical solution: the switching component includes a conductive ring fixedly disposed inside the needle sleeve and a conductive cap fixedly assembled on the outer end of the needle post. The conductive ring and the conductive cap are in movable conductive contact, and one side of the conductive ring is conductively connected to a conductive terminal through a wire.
[0007] As a further description of the above technical solution: the upper side of the conductive cap is provided with a first inclined surface, and the inner side of the conductive ring is provided with a second inclined surface that is adapted to and fits the first inclined surface.
[0008] As a further description of the above technical solution: the elastic component includes a push spring, which is fixedly mounted on the upper end of the needle post and elastically supports the needle sleeve located at the upper end of the needle post.
[0009] As a further description of the above technical solution: a limiting sleeve is provided at the lower end of the needle sleeve, a threaded seat is provided on the upper side of the needle seat and fixedly connected to the limiting sleeve, the inner wall of the limiting sleeve is provided with a thread that engages with the threaded seat, and a protrusion is provided on the lower side of the needle sleeve that moves inside the limiting sleeve.
[0010] As a further description of the above technical solution: the upper end of the needle sleeve is provided with a blind hole, and a conductive block supported by a push spring is provided in the blind hole. One end of the wire is electrically connected to the conductive block.
[0011] As a further description of the above technical solution: the lower end of the conductive terminal is provided with an abutment portion, the side of the abutment portion is provided with a threaded portion, the inner wall of the blind hole at the upper end of the needle sleeve is provided with a second thread, the threaded portion engages with the second thread, and the abutment portion makes conductive contact with the conductive block.
[0012] As a further description of the above technical solution: the threaded portion and the needle sleeve are preferably made of insulating material.
[0013] As a further description of the above technical solution: the outer surface shape of the conductive terminal is adapted to the wiring socket of the meter.
[0014] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. A push spring and an elastic support pin sleeve allow the conductive terminal to be inserted into the wiring socket of the meter in a de-energized state. After the conductive terminal is fully aligned with the wiring socket, the push unit continues to move the meter, causing the switching component to connect the circuit. This ensures that the conductive terminal remains de-energized throughout the insertion process, fundamentally eliminating tip discharge and arc erosion caused by insufficient contact. This also avoids the formation of additional contact resistance due to oxidation on the conductive terminal surface, effectively eliminating problems such as current and voltage sampling jumps and inconsistencies between the current of the tested meter and the standard meter, providing accurate and reliable assurance for meter measurement error detection.
[0015] 2. The conductive cap has a bevel on the upper side and the conductive ring has a bevel on the inner side that fits and fits with it, so that the two make surface-to-surface contact when conducting electricity rather than point-to-surface. This design effectively avoids partial discharge phenomenon during repeated contact between the conductive cap and the conductive ring, further reduces the instability of contact resistance, extends the service life of the switching components, and ensures the continuous stability of the current path. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the terminal insertion mechanism and pin assembly structure of the present invention; Figure 3 This is a schematic cross-sectional view of the pin assembly of the present invention; Figure 4 This is a schematic diagram of the disassembled structure of the pin assembly of the present invention; Figure 5 This is a schematic diagram of the upper end structure of the needle column of the present invention; Figure 6 This is a schematic diagram of the switching component structure of the present invention; Figure 7 This is a schematic diagram of the connection structure between the needle sleeve and the conductive terminal of the present invention.
[0017] In the diagram: 10, operating table; 20, hanging meter holder; 30, terminal plugging mechanism; 40, pin assembly; 41, pin seat; 411, pin post; 412, conductive cap; 413, push spring one; 42, pin sleeve; 421, conductive ring; 422, wire; 423, limiting sleeve; 424, push spring two; 425, conductive block; 43, conductive terminal; 431, threaded part; 432, contact part. Detailed Implementation
[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0019] To further understand the content of this invention, a detailed description of the invention will be provided in conjunction with the accompanying drawings.
[0020] An electricity meter testing device, comprising: The operating station 10 is set on the assembly line of large-scale continuous testing operations. Multiple operating stations are usually set up so that multiple meters can be tested at the same time, thereby improving testing efficiency.
[0021] Also includes: A meter holder 20 is movably mounted on one side of the operating table 10 for positioning and holding the electricity meter. The meter holder 20 can reciprocate in a preset direction on the operating table 10. A pushing unit is located on the back of the operating table 10 to control the movement of the meter holder 20 in the preset direction. The pushing unit is preferably an electric cylinder or an electric slide module. The body of the pushing unit is fixedly mounted on one side of the operating table 10, and its output end is connected to the meter holder 20. By pushing the meter holder 20 to move on the operating table 10, the electricity meter held by the meter holder 20 is moved in the preset direction.
[0022] A terminal connector mechanism 30 is fixedly mounted on one side of the operating table 10. Multiple pin assemblies 40 are provided on the side of the terminal connector mechanism 30 near the meter holder 20, each pin assembly 40 corresponding to a different wiring socket of the meter. A pushing unit pushes the meter held by the meter holder 20, causing the meter's wiring sockets to movably engage with the pin assemblies 40. The terminal connector mechanism 30 can then supply current to the meter through the pin assemblies 40 and perform metering error detection.
[0023] The pin assembly 40 includes a pin holder 41 fixedly mounted on one side of the terminal insertion mechanism 30. A pin post 411, which is a conductor, is located at the outer end of the pin holder 41 and is electrically connected to the detection unit inside the terminal insertion mechanism 30. One end of the pin post 411 has an elastic component, and a pin sleeve 42 is movably fitted onto the outer surface of the pin post 411. A switching component is located between the pin sleeve 42 and the pin post 411, and one end of the pin sleeve 42 has a conductive terminal 43. Under normal conditions, the elastic component elastically supports the pin sleeve 42 at the upper end of the pin post 411. During the movement of the meter by the pushing unit, the elastic component supports the conductive terminal 43 as it is inserted into the meter's wiring socket. The switching component is in an open-circuit state during the insertion of the conductive terminal 43 into the meter's wiring socket and outputs power to the conductive terminal 43 after the insertion process is completed.
[0024] Specifically, to prevent arcing and erosion of the pin assembly 40 during repeated live connection with the meter, which could lead to oxidation and additional contact resistance, causing current and voltage sampling jumps, inconsistencies between the tested and standard meters, and ultimately distorted calibration results, this device employs the following operating method: A push spring 413 supports the pin sleeve 42, keeping the switching component open during the insertion of the conductive terminal 43 into the wiring socket, thus ensuring the conductive terminal 43 is inserted into the wiring socket in a de-energized state. Once the conductive terminal 43 is fully inserted into the wiring socket and fully connected, the pushing unit continues to move the meter, causing the meter to press the pin sleeve 42 against the push spring 413 on the needle post 411. This ultimately connects the circuit between the conductive terminal 43 and the needle post 411, creating a connection between the terminal connection mechanism 30 and the meter, thus providing power to the meter and completing the test. By employing the above-mentioned working method, the phenomenon of arc erosion caused by insufficient contact between the conductive terminal 43 and the meter during the connection process is eliminated. This further avoids the formation of additional contact resistance due to oxidation on the surface of the conductive terminal 43, thus providing a reliable guarantee for the detection of metering errors.
[0025] Combination Figures 3-6 Specifically, the switching component includes a conductive ring 421 fixedly disposed inside the needle sleeve 42, and a conductive cap 412 fixedly mounted on the outer end of the needle post 411. The conductive ring 421 has support feet on both sides, and is fixed to the inner wall of the needle sleeve 42 via these support feet. The conductive ring 421 and the conductive cap 412 are in movable conductive contact, and one side of the conductive ring 421 is conductively connected to a conductive terminal 43 via a wire 422. When the push spring 413 supports the needle sleeve 42 on the upper end of the needle post 411, the conductive ring 421 and the conductive cap 412 are separated, and the switching component is in an open circuit state. When the needle sleeve 42 is pressed down on the surface of the needle post 411, it causes the conductive ring 421 to make conductive contact with the conductive cap 412, and the switching component is in a closed circuit state.
[0026] Furthermore, the conductive cap 412 has a first inclined surface on its upper side, and the conductive ring 421 has a second inclined surface on its inner side that fits and conforms to the first inclined surface. During the conductive contact between the conductive cap 412 and the conductive ring 421, the two are in direct surface-to-surface contact, rather than from point to surface. In this way, partial discharge can be effectively avoided during repeated contact between the conductive cap 412 and the conductive ring 421.
[0027] Combination Figure 5 The elastic component includes a push spring 413. The push spring 413 is fixedly mounted on the upper end of the needle post 411, and a round hole for mounting the push spring 413 is provided on the upper side of the needle post 411. The push spring 413 elastically supports the needle sleeve 42 located at the upper end of the needle post 411, and its elastic force is sufficient to support the needle sleeve 42, so that the conductive terminal 43 can be smoothly inserted into the wiring socket of the meter.
[0028] Combination Figure 4 A limiting sleeve 423 is fitted onto the lower end of the needle sleeve 42, and a threaded seat fixedly connected to the limiting sleeve 423 is provided on the upper side of the needle base 41. The inner wall of the limiting sleeve 423 has a thread that engages with the threaded seat, and a protrusion that moves within the limiting sleeve 423 is provided on the lower side of the needle sleeve 42. This protrusion on the lower side of the needle sleeve 42 moves within the limiting sleeve 423, allowing the needle sleeve 42 to move within a preset range on the surface of the needle post 411, preventing the spring force of the push spring 413 from pushing the needle sleeve 42 away. Simultaneously, by rotating and unscrewing the limiting sleeve 423, the needle sleeve 42 can be removed from the needle post 411, facilitating the maintenance and replacement of the conductive cap 412 and the push spring 413.
[0029] Combination Figure 7 The upper end of the needle sleeve 42 is provided with a blind hole, and a conductive block 425 supported by a push spring 424 is provided inside the blind hole. The conductive block 425 moves inside the blind hole, and one end of the wire 422 is electrically connected to the conductive block 425.
[0030] The lower end of the conductive terminal 43 is provided with a contact part 432, and the side of the contact part 432 is provided with a threaded part 431. The inner wall of the blind hole at the upper end of the needle sleeve 42 is provided with a second thread. The threaded part 431 engages with the second thread. The contact part 432 makes conductive contact with the conductive block 425. The outer surface shape of the conductive terminal 43 is adapted to the wiring socket of the meter.
[0031] The conductive terminal 43 is detachably mounted on the upper end of the pin sleeve 42. For meters with different types of wiring sockets, the corresponding conductive terminal 43 can be replaced on the upper end of the pin sleeve 42. This significantly increases the flexibility of testing different types of meters, enabling the same testing device to be compatible with multiple specifications of meter products, effectively reducing equipment investment costs, and improving the versatility and adaptability of the testing line.
[0032] Furthermore, the threaded portion 431 and the needle sleeve 42 are preferably made of insulating material. This design effectively avoids the overall electrification of the outer surface of the structure, significantly improves operational safety, prevents the risk of electric shock to testing personnel during operation, and also reduces the risk of short circuits caused by accidental contact, providing a reliable safety guarantee for large-scale continuous testing operations.
[0033] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.
Claims
1. A meter testing device, characterized in that, include: Control panel (10); as well as The meter holder (20) is movably mounted on one side of the operating table (10) for positioning and clamping the meter. The back of the operating table (10) is provided with a push unit to control the meter holder (20) to move in a preset direction. The terminal plug-in mechanism (30) is fixedly mounted on one side of the operating table (10). The terminal plug-in mechanism (30) has multiple pin assemblies (40) on the side near the meter rack (20). The pushing unit pushes the meter held by the meter rack (20) so that the meter's wiring socket is movably plugged into the pin assembly (40). The pin assembly (40) includes a pin seat (41) fixedly disposed on one side of the terminal plugging mechanism (30). The pin seat (41) has a pin post (411) at its outer end. One end of the pin post (411) has an elastic component. A pin sleeve (42) is movably sleeved on the outer surface of the pin post (411). A switch component is disposed between the pin sleeve (42) and the pin post (411). One end of the pin sleeve (42) has a conductive terminal (43). Under normal conditions, the elastic component elastically supports the pin sleeve (42) at the upper end of the pin post (411). When the push unit pushes the meter to move, the elastic component can support the conductive terminal (43) to be inserted into the wiring socket of the meter. The switch component is in an open circuit state during the process of the conductive terminal (43) being inserted into the wiring socket of the meter, and outputs power to the conductive terminal (43) after the insertion process is completed.
2. The meter testing device according to claim 1, characterized in that: The switching component includes a conductive ring (421) fixedly disposed inside the needle sleeve (42) and a conductive cap (412) fixedly assembled on the outer end of the needle post (411). The conductive ring (421) and the conductive cap (412) are in active conductive contact. One side of the conductive ring (421) is electrically connected to the conductive terminal (43) through a wire (422).
3. The meter testing device according to claim 2, characterized in that: The conductive cap (412) has a first inclined surface on its upper side, and the conductive ring (421) has a second inclined surface on its inner side that is adapted to fit the first inclined surface.
4. The meter testing device according to claim 1, characterized in that: The elastic component includes a push spring (413), which is fixedly mounted on the upper end of the needle post (411) and elastically supports the needle sleeve (42) located on the upper end of the needle post (411).
5. The meter testing device according to claim 4, characterized in that: The lower end of the needle sleeve (42) is fitted with a limiting sleeve (423), and the upper side of the needle seat (41) is provided with a threaded seat that is fixedly connected to the limiting sleeve (423). The inner wall of the limiting sleeve (423) is provided with a thread that meshes with the threaded seat. The lower side of the needle sleeve (42) is provided with a protrusion that moves inside the limiting sleeve (423).
6. The meter testing device according to claim 2, characterized in that: The needle sleeve (42) has a blind hole at the upper end, and a conductive block (425) supported by a push spring (424) is provided in the blind hole. One end of the wire (422) is electrically connected to the conductive block (425).
7. The meter testing device according to claim 6, characterized in that: The lower end of the conductive terminal (43) is provided with a contact part (432), the side of the contact part (432) is provided with a threaded part (431), the inner wall of the blind hole at the upper end of the needle sleeve (42) is provided with a second thread, the threaded part (431) engages with the second thread, and the contact part (432) makes conductive contact with the conductive block (425).
8. The meter testing device according to claim 7, characterized in that: The threaded portion (431) and the needle sleeve (42) are preferably made of insulating material.
9. The meter testing device according to claim 1, characterized in that: The outer surface shape of the conductive terminal (43) is adapted to the wiring socket of the meter.