Welding method and special device for relay and terminal block of single-phase electric energy meter

Abstract

The present invention discloses a welding method for a relay and a terminal seat of a single-phase electric energy meter and a special device thereof. The welding method comprises the following steps: (1) before welding, the contacts of the relay are placed in a disconnected state by using a relay disconnecting tool; (2) the moving spring welding terminal and the static spring welding terminal of the relay are welded together with the first terminal and the second terminal of the terminal seat by using an electric energy meter terminal spot welding machine; (3) after welding, the contacts of the relay are placed in a closed state by using a detection device, and the firmness of the welding point is detected, and an alarm signal is issued when the strength of the welding point does not reach a preset standard. The welding method solves the problem of the contact in the prior art that the conductivity is reduced due to high-temperature oxidation, and ensures that the relay contact still has excellent electrical performance after welding is completed; it improves the stability of the relay in long-term use, and reduces the risk of the electric energy meter's measurement accuracy being reduced due to the deterioration of the contact performance.

Description

Technical Field

[0001] The invention relates to electric energy meter production technology, in particular to a welding method and a special device for welding a relay and a terminal seat of a single-phase electric energy meter. Background Art

[0002] As a key device for measuring electric energy consumption, electric energy meters are widely used in power systems. Their internal structure usually includes relays and main terminals. The relays are used to realize the on-off control of the circuit, while the main terminals are responsible for the input and output connections of the circuit. In order to ensure the conductivity and structural stability of the electric energy meter, the prior art usually uses resistance welding to connect the relay to the main terminal. Resistance welding has the advantages of simple operation and high welding strength, and has become the mainstream process in the manufacture of electric energy meters.

[0003] However, in the prior art, if the contacts of the relay are in a closed state during welding, the high temperature generated by welding may be transferred to the contacts through the conductive structure, causing oxidation on the contact surface. Contact oxidation will significantly increase the resistance of the contacts, thereby affecting the conduction performance of the relay and the measurement accuracy of the electric energy meter. In addition, high-temperature oxidation may cause permanent damage to the contacts, affecting the long-term reliability of the relay. Summary of the invention

[0004] Based on this, it is necessary to provide a welding method and a special device for the relay and terminal seat of a single-phase electric energy meter that can effectively avoid contact oxidation, in order to address the problem of contact oxidation caused by high temperature transfer during the welding process of the relay and the main terminal in the prior art, so as to ensure the reliability of the relay and the metering accuracy of the electric energy meter.

[0005] A method for welding a relay and a terminal block of a single-phase electric energy meter, wherein the relay has a moving spring welding terminal, a static spring welding terminal, a first coil lead-out connector, and a second coil lead-out connector, and the terminal block includes a first terminal and a second terminal. The welding method includes the following steps:

[0006] (1) Before welding, the relay contacts are disconnected by using the relay disconnect tool;

[0007] (2) Using an electric energy meter terminal spot welding machine, weld the moving spring welding terminal and the stationary spring welding terminal of the relay to the first terminal and the second terminal of the terminal block;

[0008] (3) After welding is completed, the relay contacts are closed through the detection device, and the firmness of the welding point is tested. If the strength of the welding point does not meet the preset standard, an alarm signal is issued.

[0009] A special device for a welding method, comprising:

[0010] Relay disconnect tool, used to put the contacts of the relay in the disconnected state;

[0011] The electric energy meter terminal spot welding machine is used to weld the moving spring welding terminal and the static spring welding terminal of the relay with the first terminal and the second terminal of the terminal block;

[0012] The detection device is used to keep the contacts of the relay in a closed state, detect the firmness of the welding point, and send out an alarm signal when the strength of the welding point does not reach a preset standard.

[0013] In one embodiment, the relay disconnect tool comprises:

[0014] Limit fixing device, used to fix the relay;

[0015] A contact disconnection module, used for applying a preset voltage between the first coil lead-out connector and the second coil lead-out connector of the relay to ensure that the contact is disconnected;

[0016] The first state indicating device is used to send out a visual signal and / or an audible signal when the contacts of the relay are in the open state.

[0017] In one embodiment, the limiting fixing device comprises:

[0018] A fixed seat, fixed on the base;

[0019] A fixing groove, provided on the top surface of the fixing seat, for snapping into the housing of the relay;

[0020] A first support column and a second support column are arranged on one side of the housing and are used to respectively support a moving spring welding terminal and a stationary spring welding terminal of the relay;

[0021] The first conductive needle and the second conductive needle are arranged on the other side of the housing and are used to contact the first coil lead-out connector and the second coil lead-out connector of the relay respectively to achieve electrical connection.

[0022] In one embodiment, the detection device comprises:

[0023] The machine has a first direction, a second direction perpendicular to the first direction, and a third direction perpendicular to both the first direction and the second direction;

[0024] A fixture assembly, arranged on the machine platform, for fixing the relay and the terminal seat after welding;

[0025] A relay closing module, arranged on the machine platform, for applying a preset voltage between two control contacts of the relay to ensure contact closure;

[0026] a second state indicating device for sending a visual signal and / or an audible signal when the contacts of the relay are in a closed state;

[0027] A firmness detection module, comprising a pressure mechanism and a judgment mechanism, wherein the pressure mechanism is used to apply tension or pressure between the relay and the main terminal after welding, and the judgment mechanism is used to judge whether the relay and the main terminal are separated;

[0028] A third state indicating device, used to send out an alarm signal when the relay is separated from the main terminal;

[0029] A control device is connected to the clamp assembly, the relay closing module, the second state indicating device, the firmness detection module and the third state indicating device.

[0030] In one embodiment, the pressure mechanism comprises:

[0031] A stand, mounted on the machine platform;

[0032] A first pressing needle and a second pressing needle extend along a third direction and are located above the clamp assembly, and are used to apply pressure to the moving spring welding terminal and the static spring welding terminal of the relay respectively;

[0033] A pressure driving device is installed on the stand, and the pressure driving device is fixedly connected to the first pressure needle and the second pressure needle.

[0034] In one embodiment, the clamp assembly comprises:

[0035] A first seat body extending along a first direction and used to support the terminal seat;

[0036] A second seat body is disposed on one side of the first direction of the first seat body and is used to support the relay;

[0037] A first clamping mechanism, disposed on one side of the first seat body in the second direction, for applying a clamping force to one end of the terminal seat along the first direction, wherein the first clamping mechanism is connected to the control device;

[0038] The second clamping mechanism is arranged on the other side of the first seat body in the second direction, and is used to apply a clamping force to the other end of the terminal seat along the first direction. The second clamping mechanism is connected to the control device.

[0039] In one embodiment, the judgment mechanism includes:

[0040] A first guide hole and a second guide hole are provided on the first seat body and extend along a third direction, the first guide hole and the second guide hole are respectively opposite to the moving spring welding terminal and the static spring welding terminal of the relay;

[0041] A mounting frame, disposed below the first seat body, capable of moving up and down along a third direction;

[0042] A first ejector pin and a second ejector pin extend along a third direction and are mounted on the mounting frame, and upper ends of the first ejector pin and the second ejector pin are respectively inserted into the first guide hole and the second guide hole;

[0043] A first elastic component and a second elastic component are respectively arranged between the first ejector pin and the second ejector pin and the mounting frame, and are used to apply elastic forces to the first ejector pin and the second ejector pin respectively;

[0044] The first conductive member and the second conductive member are mounted on the mounting frame and are respectively located below the first elastic member and the second elastic member. When the pressure on the first ejector pin and the second ejector pin is below a preset value, the first conductive member and the second conductive member are disconnected from the first elastic member and the second elastic member. When the pressure on the first ejector pin and the second ejector pin exceeds a preset value, the first conductive member and the second conductive member are in contact with the first elastic member and the second elastic member, thereby realizing electrical connection between the first conductive member and the second conductive member and the first ejector pin and the second ejector pin.

[0045] The lifting drive device is connected to the mounting frame and is used to drive the mounting frame to move up and down along the third direction.

[0046] In one embodiment, the first elastic component and the second elastic component both include a first sliding column and a first spring, the first sliding column is inserted into a first guide hole on the mounting frame, the upper end of the first sliding column along the third direction is provided with a first limiting portion, the first spring is sleeved on the first sliding column, the upper end of the first spring abuts against the first limiting portion, and the other end abuts against the mounting frame.

[0047] In one embodiment, the first conductive member and the second conductive member both include a second slide post and a second spring, the second slide post is inserted into a second guide hole on the mounting frame, the upper end of the second slide post along the third direction is provided with a second limiting portion, the second spring is sleeved on the second slide post, the upper end of the second spring abuts against the second limiting portion, and the other two ends abut against the mounting frame.

[0048] In one embodiment, the relay closing module comprises:

[0049] A mounting seat, mounted on the mounting frame;

[0050] The third conductive needle and the fourth conductive needle are fixed on the mounting base, and the upper ends of the third conductive needle and the fourth conductive needle extend from the through holes on the machine platform, and are used to contact the first coil lead-out connector and the second coil lead-out connector of the relay respectively.

[0051] The above-mentioned welding method and special device for the relay and terminal seat of the single-phase electric energy meter keep the relay contacts in a disconnected state by using a relay disconnection tool before welding, thereby preventing the welding heat from being transferred to the contacts. This solves the problem of the contact's conductivity decreasing due to high-temperature oxidation in the prior art, ensuring that the relay contact still has excellent electrical performance after welding; it improves the stability of the relay in long-term use, and reduces the risk of the electric energy meter's measurement accuracy decreasing due to contact performance degradation. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 It is a flow chart of a method for welding a relay and a terminal block of a single-phase electric energy meter in one embodiment of the present invention;

[0053] Figure 2 A three-dimensional diagram of a relay disconnecting tool used in a method for welding a relay and a terminal block of a single-phase electric energy meter in one embodiment of the invention;

[0054] Figure 3 This is a three-dimensional picture of the relay and terminal block after welding;

[0055] Figure 4 A three-dimensional diagram of a detection device used in a welding method of a relay and a terminal block of a single-phase electric energy meter in one embodiment of the invention;

[0056] Figure 5 for Figure 4 A perspective view of the detection device shown in FIG. 1 , wherein the housing is hidden;

[0057] Figure 6 for Figure 4 Schematic diagram of the structure of the judgment mechanism of the detection device shown in.

[0058] Description of reference numerals:

[0059] 100, relay disconnect tool; 101, fixing seat; 102, fixing slot; 103, first support column; 104, second support column; 105, first conductive pin; 106, second conductive pin; 107, base; 108, first LED indicator; 109, first button;

[0060] 200, detection device; 210, machine; 220, fixture assembly; 221, first seat; 222, second seat; 223, first clamping mechanism; 223a, first pressing plate; 223b, first driving device; 224, second clamping mechanism; 224a, second pressing plate; 224b, second driving device; 230, relay closing module; 231, mounting seat; 232, third conductive needle; 233, fourth conductive needle; 240, pressure mechanism; 241, stand; 242, first pressing needle; 24 3. Second pressing needle; 244. Force cylinder; 250. Judgment mechanism; 251. Mounting frame; 251a. Support plate; 251b. First beam; 251c. Second beam; 252. First ejector pin; 253. Second ejector pin; 254. First middle piece; 255. Second middle piece; 256. First conductive piece; 257. Second conductive piece; 258. Lifting cylinder; 261. Second LED indicator; 262. Third LED indicator; 263. Fourth LED indicator; 270. Second button;

[0061] 300, relay; 310, housing; 320, moving spring welding terminal; 330, stationary spring welding terminal; 340, first coil lead-out connector; 350, second coil lead-out connector;

[0062] 400, terminal seat; 410, first terminal; 420, second terminal. DETAILED DESCRIPTION

[0063] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and understandable, the specific implementation methods of the present invention are described clearly and completely below in conjunction with the accompanying drawings. Obviously, the specific details described below are only part of the embodiments of the present invention, and the present invention can also be implemented in many other embodiments different from those described herein. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the protection scope of the present invention.

[0064] In this document, when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time. The directional words such as front, back, top, and bottom involved are defined by the positions of the parts in the drawings and the positions of the parts relative to each other, just for the clarity and convenience of expressing the technical solution. It should be understood that the use of the directional words should not limit the scope of protection claimed in the present invention.

[0065] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0066] In one embodiment of the present application, a welding method for a relay 300 and a terminal block 400 of a single-phase electric energy meter is provided, such as Figure 1 As shown, the welding method of the relay and the terminal block of the single-phase electric energy meter includes the following steps:

[0067] Step S1: Contact disconnection processing

[0068] Before welding, the contacts of the relay 300 are in an open state, and the specific operation is as follows: a preset voltage is applied between the first coil lead-out connector and the second coil lead-out connector of the relay to open the contacts of the relay. After the contacts of the relay are opened, heat will not be transferred to the contacts during the welding process, thereby avoiding oxidation of the contacts or degradation of performance due to high temperature.

[0069] Step S2: Welding operation

[0070] The moving spring welding terminal 320 and the stationary spring welding terminal 330 of the relay 300 are welded together with the first terminal 410 and the second terminal 420 of the terminal block 400. The specific operation is as follows: the relay 300 and the terminal block 400 are placed in a welding fixture, and the moving spring welding terminal 320 and the stationary spring welding terminal 330 of the relay 300 are welded together with the first terminal 410 and the second terminal 420 of the terminal block 400 by an electric energy meter terminal spot welding machine.

[0071] Step S3: Welding quality detection and alarm

[0072] After welding is completed, the contact of the relay 300 is closed through the detection device, and the firmness of the welding point is detected, and an alarm signal is issued when the strength of the welding point does not meet the preset standard. The specific operation is as follows: a preset voltage with a polarity opposite to that when disconnected is applied between the first coil lead-out connector and the second coil lead-out connector of the relay to close the contacts of the relay. The detection device applies a preset mechanical load to the welding point through a pressure mechanism. When the detection result shows that the mechanical strength of the welding point is insufficient (such as separation or deformation of the welding point), the detection device 200 sends a light signal (such as flashing red light) and / or a sound signal (such as a buzzer) through the alarm module.

[0073] In another embodiment of the present application, a special device for a welding method of a relay and a terminal seat of a single-phase electric energy meter is provided, including a relay disconnecting tool, an electric energy meter terminal spot welding machine and a detection device.

[0074] Relay disconnect tool

[0075] The relay disconnecting tool 100 is used to switch the contacts of the relay 300 to the disconnected state before welding to prevent the high temperature from affecting the contact performance during the welding process.

[0076] like Figure 2 As shown, in one embodiment, the relay disconnection tool 100 includes a limit fixing device, a contact disconnection module and a first state indicating device. The limit fixing device is used to fix the relay 300. As an example, the limit fixing device includes a base 107, a fixing seat 101 and a limit support assembly. The base 107 is a support platform for the entire tooling, and its surface is flat and has high mechanical strength, and is used to install other components. The fixing seat 101 is installed on the base 107, and a fixing groove 102 is provided on the top surface of the fixing seat 101. The size of the fixing groove 102 matches the housing 310 of the relay 300, and is used to clamp and fix the housing 310 of the relay 300. The limit support assembly is located in the fixing groove 102, and is used to support the dynamic spring welding terminal 320 and the static spring welding terminal 330 of the relay 300. As an example, the limit support assembly includes two vertically arranged first support columns 103 and second support columns 104. The limit fixing device prevents the contact from shifting or shaking during the contact disconnection operation by accurately positioning the relay 300, thereby improving the accuracy and stability of the operation.

[0077] The contact disconnection module includes an electrical connection device and a power supply assembly (not shown in the figure), and the electrical connection device includes a first conductive needle 105 and a second conductive needle 106, which are arranged on one side of the fixing groove 102. The first conductive needle 105 and the second conductive needle 106 are respectively in contact with the first coil lead-out connector 340 and the second coil lead-out connector 350 of the relay 300 to achieve a reliable electrical connection. The power supply assembly is electrically connected to the first conductive needle 105 and the second conductive needle 106. As an example, the power supply assembly is a DC power supply that can provide a stable preset voltage, and the output voltage can be adjusted to adapt to the needs of different types of relays 300. The contact disconnection module separates the moving reed and the static reed of the relay 300 by applying a preset voltage to the coil of the relay 300, ensuring that the contact is in a disconnected state, thereby avoiding oxidation or permanent damage to the contact caused by high temperature transfer during welding.

[0078] The first state indicator is used to send a visual signal and / or an auditory signal when the contacts of the relay 300 are in a disconnected state. The first state indicator provides real-time status feedback. The operator can confirm whether the contacts of the relay 300 have been successfully disconnected by observing the indicator light or listening to the buzzer sound, thereby improving the controllability and safety of the operation. As an example, the first state indicator includes a first LED indicator light 108 for providing visual feedback. The first LED indicator light 108 is connected to the output circuit of the power supply component. When the circuit is working normally and the contacts of the relay 300 are in a disconnected state, the first indicator light is on.

[0079] The relay disconnect tool 100 further includes a first button 109 , which is disposed on the base 107 and connected to the power supply assembly.

[0080] The working process of the relay disconnecting tool 100 is as follows:

[0081] (1) Relay 300 installation:

[0082] The relay 300 to be processed is placed in the fixing groove 102 of the fixing seat 101, so that the first coil lead-out connector 340 and the second coil lead-out connector 350 of the relay 300 are in contact with the first conductive needle 105 and the second conductive needle 106 respectively, to ensure stable electrical connection.

[0083] (2) Applying a preset voltage:

[0084] When the first button 109 is pressed, the power supply component of the contact disconnection module applies a preset voltage to the coil of the relay 300, the contact disconnection module is started, and the moving reed and the static reed of the relay 300 are pushed to separate, and the contact enters the disconnected state.

[0085] (3) Status confirmation:

[0086] The first status indicating device is started, and the first LED indicator light 108 is lit, prompting the operator that the contacts of the relay 300 have been successfully disconnected.

[0087] The relay disconnecting tool 100 of the present invention has the following advantages:

[0088] (1) High-precision operation: The limit fixing device ensures the stability of the relay 300 during operation and avoids positioning deviation caused by mechanical shaking;

[0089] (2) Contact protection: The contact disconnection module controls the disconnection of the relay 300 contacts by electrical means, effectively preventing the influence of welding heat on the contact performance and improving the long-term reliability of the relay 300;

[0090] (3) Intelligent status feedback: The real-time feedback function of the first status indicator device enables the operator to quickly confirm the disconnection status of the contact, improving operational efficiency and accuracy.

[0091] Electricity meter terminal spot welding machine

[0092] The electric energy meter terminal spot welding machine is used to perform the spot welding operation between the relay 300 and the terminal seat 400. The electric energy meter terminal spot welding machine is a prior art (such as the Chinese patent publication number CN113437610B), which will not be described here. Figure 3 .

[0093] Detection device

[0094] The detection device 200 is used to perform performance detection on the welding points after welding and send out an alarm signal to indicate unqualified welding points.

[0095] like Figure 4-6 The detection device 200 includes: a machine platform 210, a fixture assembly 220, a relay closing module 230, a second state indicating device, a firmness detection module, a third state indicating device and a control device.

[0096] The platform 210 is a main body of the supporting device, and its surface is flat and has a first direction ( Figure 4 The direction indicated by the "X" arrow in the figure), the second direction (perpendicular to the first direction, Figure 4 The direction indicated by the "Y" arrow in the figure) and the third direction (perpendicular to both the first and second directions, Figure 4 The machine platform 210 is made of high-strength material and has good rigidity, and can stably carry the functional components of the device. The machine platform 210 provides a stable working platform for the fixing, testing and evaluation of the relay 300 and the terminal block 400.

[0097] Clamp assembly 220:

[0098] The fixture assembly 220 is arranged on the machine 210, and is used to fix the relay 300 and the terminal block 400 after welding. In one embodiment, the fixture assembly 220 includes a first seat body 221, a second seat body 222, a first clamping mechanism 223 and a second clamping mechanism 224. The first seat body 221 extends along the first direction of the machine 210 to provide support for the terminal block 400. A positioning groove is provided on the top of the first seat body 221 for adapting the terminal block 400. The first seat body 221 is made of high-strength alloy material and has excellent wear resistance and rigidity. The first seat body 221 provides a stable support for the terminal block 400, ensuring that the position of the terminal block 400 is accurate during the detection process to avoid shaking affecting the detection results. The second seat body 222 is arranged on one side of the first direction of the first seat body 221. Used to support the relay 300, the second seat body 222 ensures that the terminals of the relay 300 are aligned with the welding points of the terminal block 400, providing precise positioning for subsequent detection.

[0099] The first clamping mechanism 223 and the second clamping mechanism 224 are respectively located on both sides of the second direction of the first seat body 221, and the first clamping mechanism 223 includes a first pressing plate 223a and a first driving device 223b. The first pressing plate 223a can rotate between the working position and the assembly and disassembly position in the plane defined by the first direction and the second direction. When in the working position, the first pressing plate 223a can move along the third direction. The first driving device 223b is connected to the first pressing plate 223a and is electrically connected to the control device. Similarly, the second clamping mechanism 224 includes a second pressing plate 224a and a second driving device 224b. The second pressing plate 224a can rotate between the working position and the assembly and disassembly position in the plane defined by the first direction and the second direction. When in the working position, the second pressing plate 224a can move along the third direction. The second driving device 224b is connected to the second pressing plate 224a and is electrically connected to the control device. The first pressing mechanism 223 and the second pressing mechanism 224 apply pressing forces to both ends of the terminal base 400 along the first direction respectively, so as to ensure that the position of the terminal base 400 in the first direction is stable to avoid movement or deviation.

[0100] Working process of the clamp assembly 220

[0101] Step 1: Installation of terminal block 400 and relay 300

[0102] The welded terminal base 400 is placed on the top of the first base body 221 so that the corresponding part thereof is inserted into the positioning groove, and the relay 300 is placed on the top of the second base body 222 .

[0103] Step 2: Automatic compression

[0104] Start the control device to control the first driving device 223b of the first clamping mechanism 223, and the first pressing plate 223a rotates from the installation and disassembly position to the working position and moves downward to clamp one end of the terminal base 400 in the first direction; the second clamping mechanism 224 acts synchronously to press the second pressing plate 224a toward the other end of the terminal base 400 in the first direction, completing the bidirectional clamping operation of the terminal base 400.

[0105] Under the fixing action of the clamp assembly 220, the terminal seat 400 and the relay 300 are stably positioned to ensure that the detection device 200 can accurately apply tension or pressure. The role of the clamp assembly 220 in the welding detection of the single-phase electric energy meter relay 300 and the terminal seat 400 is as follows:

[0106] (1) High-precision fixation: Through the coordinated design of the first base body 221 and the second base body 222, the terminal base 400 and the relay 300 are accurately positioned in the first direction;

[0107] (2) Uniform pressing: The first pressing mechanism 223 and the second pressing mechanism 224 perform bidirectional pressing on both ends of the terminal block 400 to ensure that its position is stable during the detection process;

[0108] The fixture assembly 220 is reasonably designed and easy to operate, and is suitable for welding quality inspection of a single-phase electric energy meter relay 300 and a terminal block 400, thereby significantly improving the inspection accuracy and efficiency.

[0109] Relay Closure Module 230:

[0110] The relay closing module 230 is arranged on the machine 210, and is used to apply a preset voltage between two control contacts of the relay 300 to ensure that the contacts are closed. In one embodiment, the relay closing module 230 includes a mounting seat 231, a third conductive pin 232, a fourth conductive pin 233, and a second state indicating device. The mounting seat 231 provides stable support for the third conductive pin 232 and the fourth conductive pin 233 to ensure their accurate position, thereby achieving reliable contact with the coil lead-out connector of the relay 300. The third conductive pin 232 and the fourth conductive pin 233 are fixed on the mounting seat 231, and the upper ends extend from the perforations on the machine 210, and are used to contact the first coil lead-out connector 340 and the second coil lead-out connector 350 of the relay 300 respectively. The third conductive pin 232 and the fourth conductive pin 233 are electrically connected to the control device. The second state indicating device is used to send a visual signal and / or an auditory signal when the contacts of the relay 300 are in a closed state. As an example, the second state indicating device includes a second LED indicator 261 for providing visual. The second LED indicator light 261 is connected to the output circuit of the control device, and when the contacts of the relay 300 are in a closed state, the second LED indicator light 261 is lit.

[0111] Firmness detection module:

[0112] The firmness detection module is used to detect the firmness of the welding point. The firmness detection module includes a pressure mechanism 240, a judgment mechanism 250, and a third state indication device. The pressure mechanism 240 is used to apply tension or pressure between the relay 300 and the main terminal after welding, and the judgment mechanism 250 is used to judge whether the relay 300 is separated from the main terminal; the third state indication device is used to send an alarm signal when the relay 300 is separated from the main terminal.

[0113] In one embodiment, the pressure mechanism 240 includes a stand 241, a first pressure needle 242, a second pressure needle 243 and a pressure driving device. The stand 241 is installed on the machine 210 on the other side of the first base 221 opposite to the second base 222. The stand 241 provides a support platform for the pressure driving device and the pressure needle, and ensures the stability and uniformity of the pressure force. The first pressure needle 242 and the second pressure needle 243 extend along the third direction and are located above the clamp assembly 220, and are used to apply pressure to the dynamic spring welding terminal 320 and the static spring welding terminal 330 of the relay 300 respectively. The pressure driving device is installed on the stand 241 and is connected to the first pressure needle 242 and the second pressure needle 243. The pressure driving device is connected to the control device. The pressure driving device is used to drive the first pressure needle 242 and the second pressure needle 243 to move along the third direction to achieve pressure on the welding point. As an example, the pressure driving device includes a pressure cylinder installed on the stand 241, and the telescopic rod of the pressure cylinder is fixedly connected to the first pressure needle 242 and the second pressure needle 243 through a connecting piece.

[0114] Judgment Agency 250:

[0115] The judging mechanism 250 is used to judge whether the relay 300 is separated from the main terminal. The judging mechanism 250 includes a first guide hole, a second guide hole, a mounting frame 251, a first ejector pin 252, a second ejector pin 253, a first elastic component (not shown in the figure), a second elastic component (not shown in the figure), a first middle piece 254, a second middle piece 255, a first conductive member 256, a second conductive member 257 and a lifting drive device. The first guide hole and the second guide hole are arranged on the bottom of the first seat 221 and extend along the third direction. The first guide hole and the second guide hole are respectively opposite to the moving spring welding terminal 320 and the static spring welding terminal 330 of the relay 300. The first guide hole and the second guide hole are used to guide the first ejector pin 252 and the second ejector pin 253 to ensure that the ejector pins are aligned with the moving spring welding terminal 320 and the static spring welding terminal 330 of the relay 300; and provide a stable motion trajectory to prevent the ejector pins from deviating and affecting the detection results.

[0116] The mounting frame 251 is arranged below the first seat body 221 and can move up and down along the third direction. The mounting frame 251 includes a support plate 251a, a first crossbeam 251b and a second crossbeam 251c. The support plate 251a is provided with a first positioning hole and a second positioning hole for fixing the first ejector pin 252 and the second ejector pin 253 to ensure their stable movement. The first crossbeam 251b and the second crossbeam 251c are arranged in sequence from below the support plate 251a.

[0117] The first ejector pin 252 and the second ejector pin 253 are slender metal rods extending along the third direction, and their tops are respectively inserted into the first guide hole and the second guide hole, opposite to the welding point; and their bottoms are fixed on the support plate 251a through the first positioning hole and the second positioning hole, respectively.

[0118] The first elastic component and the second elastic component are respectively disposed between the first ejector pin 252, the second ejector pin 253 and the support plate 251a, and are used to apply elastic force to the first ejector pin 252 and the second ejector pin 253. As an example, the first elastic component and the second elastic component are coil springs, which are respectively mounted on the lower part of the first ejector pin 252 and the second ejector pin 253, and are located between the support plate 251a and the ejector pins.

[0119] The first middle piece 254 and the second middle piece 255 are installed on the first cross beam 251b, and can move up and down along the third direction, respectively corresponding to the first ejector pin 252 and the second ejector pin 253. As an example, the first middle piece 254 and the second middle piece 255 each include a conductive first slide bar and a first coil spring, the upper end of the first slide bar is provided with a first stopper, the lower end of the first slide bar is inserted into the first guide hole on the first cross beam 251b, and the first coil spring is sleeved on the first slide bar, one end of which abuts against the first stopper, and the other end abuts against the first cross beam 251b.

[0120] The first conductive member 256 and the second conductive member 257 are fixedly mounted on the second cross beam 251c, and are respectively located directly below the first middle member 254 and the second middle member 255. As an example, the first middle member 254 and the second middle member 255 each include a conductive second slide bar and a second coil spring, the upper end of the second slide bar is provided with a second stopper, the lower end of the second slide bar is inserted into the second guide hole on the second cross beam 251c, and the second coil spring is sleeved on the second slide bar, one end of which abuts against the second stopper, and the other end abuts against the second cross beam 251c.

[0121] The lifting drive device is connected to the mounting frame 251, and is used to drive the mounting frame 251 to move up and down along the third direction. The lifting drive device is connected to the control device. As an example, the lifting drive device includes a lifting cylinder 258, and the telescopic rod of the lifting cylinder 258 is connected to the mounting frame 251. The lifting movement of the mounting frame 251 is realized by the control device.

[0122] The working principle of the judging mechanism 250 is as follows:

[0123] Before testing, the relay 300 and the main terminal are fixed in the fixture assembly 220 to ensure that the moving spring welding terminal 320 and the static spring welding terminal 330 are aligned with the first guide hole and the second guide hole.

[0124] During the inspection, the control device is started, and the lifting drive device adjusts the height of the mounting frame 251 so that the tops of the first ejector pin 252 and the second ejector pin 253 contact the welding point. At the same time, the force cylinder 244 drives the first pressure pin 242 and the second pressure pin 243 to move downward, and applies a preset pressure on the dynamic spring welding terminal 320 and the static spring welding terminal 330. If the strength of the welding point meets the standard, the welding point will not separate, and the dynamic spring and the static spring of the relay 300 remain stable; if the strength of the welding point is insufficient, under the action of pressure, the dynamic spring welding terminal 320 or the static spring welding terminal 330 moves downward, and when the dynamic spring welding terminal 320 or the static spring welding terminal 330 moves downward, the first ejector pin 252 or the second ejector pin 253 in contact with it is pushed downward; the downward movement of the ejector pin further pushes the corresponding first middle piece 254 or the second middle piece 255 to move downward along the third direction. When the first intermediate piece 254 or the second intermediate piece 255 moves downward to the designated position, it contacts the first conductive piece 256 or the second conductive piece 257; the conductive pieces contact to form a closed circuit, completing the electrical signal transmission of the weld separation. The signal of the closed circuit is received in real time by the control device, which determines the weld separation state; the control device sends a control signal to the third state indicating device to trigger the alarm mechanism. The third state indicating device is activated, and emits a light signal (such as a flashing red warning light) and / or a sound signal (such as a buzzer) to prompt the operator that the weld detection has failed.

[0125] The welding method and supporting device design of the relay 300 and the terminal block 400 of the single-phase electric energy meter of the present application aim at solving the problems of contact oxidation and unstable welding point strength in the prior art, and have the following technical effects:

[0126] 1. Effectively prevent contact oxidation and improve relay 300 reliability

[0127] By using the relay disconnecting tool 100 before welding, the contacts of the relay 300 are kept in a disconnected state to prevent the welding heat from being transferred to the contacts. This solves the problem of the contacts in the prior art that the conductivity is reduced due to high-temperature oxidation, ensuring that the contacts of the relay 300 still have excellent electrical performance after welding is completed; it improves the stability of the relay 300 in long-term use, and reduces the risk of reduced measurement accuracy of the electric energy meter due to contact performance degradation.

[0128] 2. Rapidly detect welding quality and reduce defective rate

[0129] By using the detection device 200 to detect the firmness of the welding points and to give non-compliance alarms, unqualified welding points can be found and marked in time. The non-compliance alarm function prompts the operator to deal with the problem in time, reduces the number of defective products entering the subsequent assembly links, and improves the quality control efficiency of the production line.

[0130] 3. Improve process automation level and optimize production efficiency

[0131] The key components of the present invention (such as the relay disconnecting tool 100, the welding fixture and the detection device 200) realize the automated operation of the welding and detection process. The control device unifies and coordinates the process flow, reduces manual intervention, and improves the automation level of the production line; the welding and quality detection operations are completed quickly, which significantly shortens the production cycle and improves production efficiency.

[0132] In summary, the present invention achieves quality optimization and efficiency improvement in the welding process of the relay 300 and the terminal block 400 through innovative design, overcomes the shortcomings of the prior art, provides a reliable and efficient solution for the production of single-phase electric energy meters, and has significant industrial application value and promotion prospects.

[0133] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A method for welding a relay and a terminal block of a single-phase electric energy meter, wherein the relay has a moving spring welding terminal, a static spring welding terminal, a first coil lead-out connector and a second coil lead-out connector, and the terminal block includes a first terminal and a second terminal, characterized in that: The welding method comprises the following steps: (1) Before welding, make sure the contacts of the relay are disconnected; (2) welding the moving spring welding terminal and the stationary spring welding terminal of the relay together with the first terminal and the second terminal of the terminal block; (3) After welding is completed, the relay contacts are closed through the detection device, and the firmness of the welding point is tested. If the strength of the welding point does not meet the preset standard, an alarm signal is issued.

2. The dedicated device for the welding method according to claim 1, characterized in that: include: Relay disconnect tool, used to put the contacts of the relay in the disconnected state; The electric energy meter terminal spot welding machine is used to weld the moving spring welding terminal and the static spring welding terminal of the relay with the first terminal and the second terminal of the terminal block; The detection device is used to keep the contacts of the relay in a closed state, detect the firmness of the welding point, and send out an alarm signal when the strength of the welding point does not reach a preset standard.

3. The dedicated device for the welding method according to claim 2, characterized in that: The relay disconnect tool comprises: Limit fixing device, used to fix the relay; A contact disconnection module, used for applying a preset voltage between the first coil lead-out connector and the second coil lead-out connector of the relay to ensure that the contact is disconnected; The first state indicating device is used to send out a visual signal and / or an audible signal when the contacts of the relay are in the open state.

4. The dedicated device for the welding method according to claim 3, characterized in that: The limiting fixing device comprises: A fixed seat, fixed on the base; A fixing groove, provided on the top surface of the fixing seat, for snapping into the housing of the relay; A first support column and a second support column are arranged on one side of the housing and are used to respectively support a moving spring welding terminal and a stationary spring welding terminal of the relay; The first conductive needle and the second conductive needle are arranged on the other side of the housing and are used to contact the first coil lead-out connector and the second coil lead-out connector of the relay respectively to achieve electrical connection.

5. The dedicated device for the welding method according to claim 2, characterized in that: The detection device comprises: The machine has a first direction, a second direction perpendicular to the first direction, and a third direction perpendicular to both the first direction and the second direction; A fixture assembly, arranged on the machine platform, for fixing the relay and the terminal seat after welding; A relay closing module, arranged on the machine platform, for applying a preset voltage between the first coil lead-out connector and the second coil lead-out connector of the relay to ensure contact closure; a second state indicating device for sending a visual signal and / or an audible signal when the contacts of the relay are in a closed state; A firmness detection module, comprising a pressure mechanism and a judgment mechanism, wherein the pressure mechanism is used to apply tension or pressure between the relay and the main terminal after welding, and the judgment mechanism is used to judge whether the relay and the main terminal are separated; A third state indicating device, used to send out an alarm signal when the relay is separated from the main terminal; A control device is connected to the clamp assembly, the relay closing module, the second state indicating device, the firmness detection module and the third state indicating device.

6. The dedicated device for the welding method according to claim 5, characterized in that: The pressure mechanism comprises: A stand, mounted on the machine platform; A first pressing needle and a second pressing needle extend along a third direction and are located above the clamp assembly, and are used to apply pressure to the moving spring welding terminal and the static spring welding terminal of the relay respectively; A pressure driving device is installed on the stand, and the pressure driving device is fixedly connected to the first pressure needle and the second pressure needle.

7. The dedicated device for the welding method according to claim 5, characterized in that: The clamp assembly comprises: A first seat body extending along a first direction and used to support the terminal seat; A second seat body is disposed on one side of the first direction of the first seat body and is used to support the relay; A first clamping mechanism, disposed on one side of the first seat body in the second direction, for applying a clamping force to one end of the terminal seat along the first direction, wherein the first clamping mechanism is connected to the control device; The second clamping mechanism is arranged on the other side of the first seat body in the second direction, and is used to apply a clamping force to the other end of the terminal seat along the first direction. The second clamping mechanism is connected to the control device.

8. The dedicated device for the welding method according to claim 7, characterized in that: The judgment mechanism includes: A first guide hole and a second guide hole are provided on the first seat body and extend along a third direction, the first guide hole and the second guide hole are respectively opposite to the moving spring welding terminal and the static spring welding terminal of the relay; A mounting frame, disposed below the first seat body, capable of moving up and down along a third direction; A first ejector pin and a second ejector pin extend along a third direction and are mounted on the mounting frame, and upper ends of the first ejector pin and the second ejector pin are respectively inserted into the first guide hole and the second guide hole; A first elastic component and a second elastic component are respectively arranged between the first ejector pin and the second ejector pin and the mounting frame, and are used to apply elastic forces to the first ejector pin and the second ejector pin respectively; The first conductive member and the second conductive member are mounted on the mounting frame and are respectively located below the first elastic member and the second elastic member. When the pressure on the first ejector pin and the second ejector pin is below a preset value, the first conductive member and the second conductive member are disconnected from the first elastic member and the second elastic member. When the pressure on the first ejector pin and the second ejector pin exceeds a preset value, the first conductive member and the second conductive member are in contact with the first elastic member and the second elastic member, thereby realizing electrical connection between the first conductive member and the second conductive member and the first ejector pin and the second ejector pin. The lifting drive device is connected to the mounting frame and is used to drive the mounting frame to move up and down along the third direction.

9. The dedicated device for the welding method according to claim 7, characterized in that: The first elastic component and the second elastic component both include a first slide post and a first spring. The first slide post is inserted into a first guide hole on the mounting frame. A first limiting portion is provided at an upper end of the first slide post along a third direction. The first spring is sleeved on the first slide post, with an upper end thereof abutting against the first limiting portion and the other end abutting against the mounting frame.

10. The dedicated device for the welding method according to claim 7, characterized in that: The first conductive member and the second conductive member both include a second slide post and a second spring. The second slide post is inserted into a second guide hole on the mounting frame. The upper end of the second slide post along the third direction is provided with a second limiting portion. The second spring is sleeved on the second slide post, with its upper end resting on the second limiting portion and the other two ends resting on the mounting frame.

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