Welding method for relay and connecting terminal of three-phase electric energy meter and special device thereof

Abstract

The invention discloses a welding method for a relay and a connecting terminal of a three-phase electric energy meter and a special device thereof, and the welding method comprises the following steps: (1) before welding, enabling a contact of the relay to be in a disconnected state through a relay disconnection tool; (2) placing the relay in a welding clamp, and covering the relay with a shielding cover; (3) placing the welding fixture provided with the relay on an electric energy meter terminal spot welding machine, and welding three movable reed welding terminals and three static reed welding terminals of the relay with six connecting terminals together by using the electric energy meter terminal spot welding machine; and (4) after welding is completed, a contact of the relay is in a closed state through a detection device, and firmness detection is conducted on a welding point. According to the welding method, the problem that the conductivity of the contact is reduced due to high-temperature oxidation in the prior art is solved, and it is ensured that the relay contact still has excellent electrical performance after welding is completed.

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 connecting terminal of a three-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 the connecting terminal of a three-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 connection terminal of a three-phase electric energy meter, wherein the relay has three moving spring welding terminals, three static spring welding terminals and a coil lead-out terminal, and the welding method comprises the following steps:

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

[0007] (2) Place the relay and six connection terminals in a welding fixture and cover the relay with a shielding cover;

[0008] (3) Place the welding fixture equipped with the relay on the electric energy meter terminal spot welding machine, and use the electric energy meter terminal spot welding machine to weld the three moving reed welding terminals and the three static reed welding terminals of the relay with the six connecting terminals;

[0009] (4) 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.

[0010] A special device for welding a relay and a connection terminal of a three-phase electric energy meter, comprising:

[0011] Relay disconnect tool, used to put the contacts of the relay in the disconnected state;

[0012] A welding fixture for placing the relay, including a shielding cover for shielding the high-frequency signal generated during the welding process;

[0013] The electric energy meter terminal spot welding machine is used to weld the three moving spring welding terminals and three static spring welding terminals of the relay with the six connecting terminals;

[0014] 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.

[0015] In one embodiment, the relay disconnect tool comprises:

[0016] Limit fixing device, used to fix the relay;

[0017] A contact opening module, used to apply a preset voltage to the coil of the relay to ensure that the contacts are opened;

[0018] 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.

[0019] In one embodiment, the detection device comprises:

[0020] 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;

[0021] A fixture assembly, arranged on the machine platform, for fixing the relay and the connection terminal after welding;

[0022] A relay closing module, arranged on the machine platform, for applying a preset voltage to the coil of the relay to ensure contact closure;

[0023] 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;

[0024] 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;

[0025] A third state indicating device, used to send out an alarm signal when the relay is separated from the main terminal;

[0026] 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.

[0027] In one embodiment, the pressure mechanism comprises:

[0028] A stand, mounted on the machine platform;

[0029] Six pressure pins extending along the third direction and located above the clamp assembly, used to apply pressure to the three moving spring welding terminals and the three static spring welding terminals of the relay respectively;

[0030] A pressure driving device is installed on the stand, and the pressure driving device is connected to the six pressure needles.

[0031] In one embodiment, the clamp assembly comprises:

[0032] A first seat body extending along a first direction and used for fixing six connecting terminals;

[0033] 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;

[0034] The clamping mechanism is used to apply a clamping force to the connecting terminal, and the clamping mechanism is connected to the control device.

[0035] In one embodiment, the judgment mechanism includes:

[0036] A guide hole is provided on the first seat body and extends along the third direction, the guide hole being respectively opposite to the moving spring piece welding terminal and the stationary spring piece welding terminal of the relay;

[0037] A mounting frame, disposed below the first seat body, capable of moving up and down along a third direction;

[0038] An ejector pin extends along a third direction and is mounted on the mounting frame, wherein the upper end of the ejector pin is respectively inserted into the first guide hole and the second guide hole;

[0039] Elastic components are respectively arranged between the ejector pins and the mounting frame, and are used to apply elastic forces to the ejector pins respectively;

[0040] The conductive member is mounted on the mounting frame and is respectively located below the elastic member. When the pressure on the ejector pin is below a preset value, the conductive member is disconnected from the elastic member. When the pressure on the ejector pin exceeds the preset value, the conductive member is in contact with the elastic member to achieve electrical connection between the conductive member and the ejector pin.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] In one embodiment, the relay closing module comprises:

[0045] A mounting seat, mounted on the mounting frame;

[0046] The third conductive needle and the fourth conductive needle are fixed on the mounting seat, 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 coil lead-out wire connectors of the relay respectively.

[0047] The above-mentioned welding method and special device for the relay and connection terminal of the three-phase electric energy meter, by using the relay disconnection tool before welding, keeps the relay contacts in the disconnected state to avoid the welding heat from being transferred to the contacts. The problem of the contact's conductivity decreasing due to high-temperature oxidation in the prior art is solved, ensuring that the relay contact still has excellent electrical performance after welding is completed; the stability of the relay in long-term use is improved, and the risk of the electric energy meter's measurement accuracy decreasing due to contact performance degradation is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 It is a flow chart of a method for welding a relay and a connection terminal of a three-phase electric energy meter in one embodiment of the present invention;

[0049] Figure 2 A front view of a relay of a three-phase electric energy meter in one embodiment of the invention;

[0050] Figure 3 A three-dimensional diagram of a relay disconnecting tool used in a method for welding a relay and a connection terminal of a three-phase electric energy meter in one embodiment of the invention;

[0051] Figure 4 A perspective view of a welding fixture in one embodiment of the invention;

[0052] Figure 5A three-dimensional diagram of a detection device used in a welding method for a relay and a connection terminal of a three-phase electric energy meter in one embodiment of the invention;

[0053] Figure 6 for Figure 5 A perspective view of the detection device shown in FIG. 1 , wherein the housing is hidden;

[0054] Figure 7 for Figure 5 A perspective view of a fixture assembly of the detection device shown in ;

[0055] Figure 8 for Figure 5 A right side view of a fixture assembly of the detection device shown in ;

[0056] Fig. 9 for Figure 5 Schematic diagram of the structure of the judgment mechanism of the detection device shown in.

[0057] Description of reference numerals:

[0058] 100, relay disconnect tool; 101, fixing seat; 102, fixing slot; 103, first socket; 107, base; 108, first LED indicator; 109, first button;

[0059] 200, detection device; 210, machine table; 220, fixture assembly; 221, seat; 221a, positioning groove; 221b, cushion block; 222, pressing plate; 223, first driving device; 224, second driving device; 230, relay closing module; 231, second socket; 232, mounting seat; 240, pressure mechanism; 241, stand; 242, pressure needle; 244, force cylinder; 250, judgment mechanism; 251, mounting frame; 251a, support plate; 251b, first beam; 251c, second beam; 252, ejector pin; 254, middle piece; 256, conductive piece; 257, lifting cylinder; 260, display screen; 270, second button;

[0060] 300, relay; 310, housing; 320, moving spring welding terminal; 330, static spring welding terminal;

[0061] 400, connecting terminal;

[0062] 500, welding fixture; 510, seat body; 520, pressure rod; 530, 530 shielding cover. 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 connection terminal 400 of a three-phase electric energy meter is provided, such as Figure 1 As shown, the welding method of the relay 300 and the connecting terminal 400 of the three-phase electric energy meter includes the following steps:

[0067] Step S1: Contact disconnection processing

[0068] Before welding, the relay 300 is disconnected by the relay disconnection tool 100 to ensure that the contacts of the relay 300 are in the disconnected state. The specific operation is as follows: a preset voltage is applied to the coil of the relay 300 to drive the relay 300 to switch to the contact disconnected state. After the contacts of the relay are disconnected, heat will not be transferred to the contacts during the welding process, avoiding oxidation of the contacts or degradation of performance due to high temperature.

[0069] Step S2: Place the relay and connect the terminals

[0070] The relay 300 and the six connection terminals are placed in a welding fixture, and a shielding cover is placed outside the relay. The shielding cover is used to shield the high-frequency signal generated during the welding process to prevent the high-frequency signal from passing through the relay coil and causing the contacts to close accidentally.

[0071] Step S3: Welding operation

[0072] The movable spring welding terminal 320 and the stationary spring welding terminal 330 of the relay 300 are welded together with the connection terminal 400 using the electric energy meter terminal spot welding machine. The specific operation is as follows: the welding fixture with the relay 300 and the terminal block 400 is placed on the electric energy meter terminal spot welding machine, and the movable 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 the electric energy meter terminal spot welding machine.

[0073] Step S4: Welding quality detection and alarm

[0074] After welding is completed, the contact of the relay 300 is closed through the detection device 200, 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 it is disconnected is applied between the coils 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.

[0075] In another embodiment of the present application, a special device for a welding method of a relay and a terminal seat of a three-phase electric energy meter is provided, including a relay disconnecting tool, an electric energy meter terminal spot welding machine and a detection device.

[0076] The special device for welding the relay and the terminal seat of the three-phase electric energy meter comprises a relay disconnecting tool, a welding fixture, an electric energy meter terminal spot welding machine and a detection device.

[0077] Relay disconnect tool

[0078] like Figure 2 As shown, the relay 300 has three moving spring welding terminals 320, three stationary spring welding terminals 330 and a coil lead-out terminal (not shown in the figure).

[0079] 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. Figure 3As 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 and a fixing seat 101. The base 107 is a supporting platform for the entire tool, 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 clip and fix the housing 310 of the relay 300.

[0080] 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 socket 103, which is arranged on one side of the fixing groove 102. The first socket 103 is plugged into and matched with the coil lead connector of the relay 300 to achieve a reliable electrical connection. The power supply assembly is electrically connected to the first socket 103. 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 applies a preset voltage to the coil of the relay 300 to separate the moving reed and the static reed of the relay 300, ensuring that the contacts are in a disconnected state, thereby avoiding oxidation or permanent damage to the contacts caused by high temperature transfer during welding.

[0081] 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.

[0082] 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.

[0083] The working process of the relay disconnecting tool 100 is as follows:

[0084] (1) Relay installation:

[0085] The relay 300 to be processed is placed in the fixing groove 102 of the fixing seat 101, so that the coil lead wire connectors of the relay 300 are respectively in contact with the first socket 103 to ensure stable electrical connection.

[0086] (2) Applying a preset voltage:

[0087] 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.

[0088] (3) Status confirmation:

[0089] 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.

[0090] The relay disconnecting tool 100 of the present invention has the following advantages:

[0091] (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;

[0092] (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;

[0093] (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.

[0094] Welding fixture

[0095] like Figure 4 As shown, the welding fixture is used to place the relay. The welding fixture includes a base for placing the relay and the connecting terminal, a pressure rod for fixing the connecting terminal, and a shielding cover. The shielding cover is used to shield the high-frequency signal generated during the resistance welding process to prevent the high-frequency signal from passing through the relay coil and causing the contact to close accidentally. As an example, the shielding cover is pivotally connected to the base. In this way, before placing the relay, the shielding cover is opened, and after placing it, the shielding cover is covered, which is easy to operate.

[0096] Electricity meter terminal spot welding machine

[0097] The electric energy meter terminal spot welding machine is used to perform the spot welding operation between the relay 300 and the connecting terminal 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 in detail here. Figure 3 .

[0098] Detection device

[0099] 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.

[0100] like Figure 5-9 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.

[0101] 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 and the connecting terminal 400.

[0102] Fixture components:

[0103] The fixture assembly 220 is arranged on the machine 210, and is used to fix the relay 300 and the connecting terminal 400 after welding. In one embodiment, the fixture assembly 220 includes a seat 221, a pressure plate 222, a first driving device 223 and a second driving device 224. The seat 221 extends along the first direction of the machine 210 to provide support for the relay 300 and the connecting terminal 400. A positioning groove 221a and a cushion block 221b are provided on the top of the seat 221. The positioning groove 221a is used to adapt the relay 300, and the cushion block 221b is used to support the connecting terminal 400. The seat 221 is made of high-strength alloy material and has excellent wear resistance and rigidity. The seat 221 provides a stable support for the connecting terminal 400, ensuring that the connecting terminal 400 is accurately positioned during the detection process to prevent shaking from affecting the detection results.

[0104] The pressing plate 222 is disposed above the cushion block 221 b of the seat body 221 , and can be raised and lowered along the third direction. The pressing plate 222 cooperates with the cushion block 221 b to expedite the connection terminal 400 .

[0105] The first driving device 223 and the second driving device 224 are connected to both ends of the pressing plate 222 along the first direction, and are used to drive the pressing plate 222 to move along the third direction. The first driving device 223 and the second driving device 224 are connected to the control device.

[0106] Working process of the clamp assembly 220

[0107] Step 1: Installation of connection terminal 400 and relay 300

[0108] The welded relay 300 is placed in the positioning groove 221 a of the base 221 , and the connecting terminal 400 is placed between the pad 221 b of the base 221 and the pressing plate 222 .

[0109] Step 2: Automatic compression

[0110] The control device is started to control the first driving device 223 and the second driving device 224 to press the pressing plate 222 toward the connecting terminal 400 , thereby completing the pressing operation of the connecting terminal 400 .

[0111] Under the fixing action of the clamp assembly 220 , the connection terminal 400 and the relay 300 are stably positioned, ensuring that the detection device 200 can accurately apply pressure.

[0112] Relay Closure Module 230:

[0113] The relay closing module 230 is disposed on the machine 210, and is used to apply a preset voltage between two control contacts of the relay 300 to ensure contact closure. In one embodiment, the relay closing module 230 includes a mounting seat 232 and a second socket 231, and the mounting seat 232 provides a stable support for the second socket 231 to ensure its accurate position, thereby achieving reliable contact with the coil lead-out connector of the relay 300. The second socket 231 is fixed on the mounting seat 232, and the second socket 231 cooperates with the coil lead-out connector of the relay 300.

[0114] Firmness detection module:

[0115] 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.

[0116] In one embodiment, the pressure mechanism 240 includes a stand 241, six pressure pins 242 and a pressure driving device. The stand 241 is installed on the machine 210 on the other side of the seat 221 opposite to the second seat. The stand 241 provides a support platform for the pressure driving device and the pressure pins 242, and ensures the stability and uniformity of the pressure force. The pressure pins 242 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 connected to the pressure pins 242. The pressure driving device is connected to the control device. The pressure driving device is used to drive the pressure pins 242 to move along the third direction to achieve pressure on the welding point. As an example, the pressure driving device includes a pressure cylinder, which is installed on the stand 241, and the telescopic rod of the pressure cylinder is fixedly connected to the pressure pins 242 through a connecting piece.

[0117] Judging body:

[0118] The judging mechanism 250 is used to judge whether the relay 300 is separated from the main terminal. The judging mechanism 250 includes a guide hole, a mounting frame 251, a pin 252, an elastic component (not shown in the figure), an intermediate piece 254, a conductive piece 256, and a lifting drive device. The guide hole is arranged between the positioning groove 221a and the cushion block 221b of the seat body 221 and extends along the third direction. The six guide holes are respectively opposite to the three moving spring welding terminals 320 and the three static spring welding terminals 330 of the relay 300. The guide hole is used to guide the pin 252 to ensure that the pin 252 is aligned with the moving spring welding terminal 320 and the static spring welding terminal 330 of the relay 300; and to provide a stable motion trajectory to prevent the pin 252 from deviating and affecting the detection result.

[0119] The mounting frame 251 is arranged below the 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 positioning hole for fixing the ejector pin 252 to ensure its stable movement. The first crossbeam 251b and the second crossbeam 251c are arranged in sequence from below the support plate 251a.

[0120] The ejector pins 252 are slender metal rods extending along the third direction, with their tops respectively inserted into the guide holes, opposite to the welding points; and their bottoms respectively fixed on the support plate 251a through positioning holes.

[0121] The elastic components are respectively arranged between the ejector pins 252 and the support plate 251a, and are used to apply elastic force to the ejector pins 252. As an example, the elastic components are coil springs, which are respectively sleeved on the lower part of the ejector pins 252 and located between the support plate 251a and the ejector pins 252.

[0122] The middle piece 254 is mounted on the first cross beam 251b, and can move up and down along the third direction, respectively corresponding to the ejector pins 252. As an example, the middle piece 254 includes a conductive first slide bar and a first coil spring, the upper end of the first slide bar is provided with a first limit head, 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 limit head, and the other end abuts against the first cross beam 251b.

[0123] The conductive member 256 is fixedly mounted on the second cross beam 251c and is respectively located directly below the middle member 254. As an example, the middle member 254 includes 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.

[0124] 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 257, and the telescopic rod of the lifting cylinder 257 is connected to the mounting frame 251. The lifting movement of the mounting frame 251 is realized by the control device.

[0125] The working principle of the judging mechanism 250 is as follows:

[0126] 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 guide hole.

[0127] During the test, the control device is started, and the lifting drive device adjusts the height of the mounting frame 251 so that the top of the ejector pin 252 contacts the welding point. At the same time, the force cylinder 244 drives the pressure pin 242 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 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 ejector pin 252 in contact with it is pushed downward; the downward movement of the ejector pin 252 further pushes the corresponding middle piece 254 to move downward along the third direction. When the middle piece 254 moves downward to the specified position, it contacts the conductive member 256; the conductive member 256 contacts to form a closed circuit, completing the electrical signal transmission of the welding point separation. The signal of the closed circuit is received in real time by the control device, and the control device determines the separation state of the welding spot; 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 welding spot detection has failed.

[0128] The second state indicating device is used to send out a visual signal and / or an audible signal when the contacts of the relay 300 are in a closed state, and to send out an alarm signal when the relay 300 is separated from the main terminal. As an example, the second state indicating device includes a display screen 260 for providing a visual signal.

[0129] The welding method and supporting device design of the relay 300 and the connection terminal 400 of the three-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:

[0130] 1. Effectively prevent contact oxidation and improve relay 300 reliability

[0131] 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.

[0132] 2. Rapidly detect welding quality and reduce defective rate

[0133] 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.

[0134] 3. Improve process automation level and optimize production efficiency

[0135] 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.

[0136] In summary, the present invention achieves quality optimization and efficiency improvement in the welding process of the relay 300 and the connecting terminal 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.

[0137] 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 connection terminal of a three-phase electric energy meter, wherein the relay has three moving spring welding terminals, three static spring welding terminals and a coil lead-out terminal, characterized in that: The welding method comprises the following steps: (1) Before welding, the relay contacts are disconnected by using the relay disconnect tool; (2) Place the relay and six connection terminals in a welding fixture and place a shielding cover outside the relay; (3) Place the welding fixture equipped with the relay on the electric energy meter terminal spot welding machine, and use the electric energy meter terminal spot welding machine to weld the three moving reed welding terminals and the three static reed welding terminals of the relay with the six connecting terminals; (4) 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; A welding fixture for placing the relay, including a shielding cover for shielding the high-frequency signal generated during the welding process; The electric energy meter terminal spot welding machine is used to weld the three moving spring welding terminals and three static spring welding terminals of the relay with the six connecting terminals; 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 opening module, used to apply a preset voltage to the coil of the relay to ensure that the contacts are opened; 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 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 connection terminal after welding; A relay closing module, arranged on the machine platform, for applying a preset voltage to the coil of the relay to ensure contact closure; 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 second state indicating device for giving a visual signal and / or an audible signal when the contacts of the relay are in a closed state, and giving 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 firmness detection module and the second state indicating device.

5. The dedicated device for the welding method according to claim 4, characterized in that: The pressure mechanism comprises: A stand, mounted on the machine platform; Six pressure pins extending along the third direction and located above the clamp assembly, used to apply pressure to the three moving spring welding terminals and the three static spring welding terminals of the relay respectively; A pressure driving device is installed on the stand, and the pressure driving device is connected to the six pressure needles.

6. The dedicated device for the welding method according to claim 4, characterized in that: The clamp assembly comprises: A first seat body extending along a first direction and used for fixing six connecting terminals; 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; The clamping mechanism is used to apply a clamping force to the connecting terminal, and the clamping mechanism is connected to the control device.

7. The dedicated device for the welding method according to claim 6, characterized in that: The judgment mechanism includes: A guide hole is provided on the first seat body and extends along the third direction, the guide hole being respectively opposite to the moving spring piece welding terminal and the stationary spring piece welding terminal of the relay; A mounting frame, disposed below the first seat body, capable of moving up and down along a third direction; An ejector pin extends along a third direction and is mounted on the mounting frame, wherein the upper end of the ejector pin is respectively inserted into the first guide hole and the second guide hole; Elastic components are respectively arranged between the ejector pins and the mounting frame, and are used to apply elastic forces to the ejector pins respectively; The conductive member is mounted on the mounting frame and is respectively located below the elastic member. When the pressure on the ejector pin is below a preset value, the conductive member is disconnected from the elastic member. When the pressure on the ejector pin exceeds the preset value, the conductive member is in contact with the elastic member to achieve electrical connection between the conductive member and the 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.

8. The dedicated device for the welding method according to claim 6, 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.

9. The dedicated device for the welding method according to claim 6, 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.

10. The dedicated device for the welding method according to claim 7, characterized in that: The relay closing module comprises: A mounting seat, mounted on the mounting frame; The third conductive needle and the fourth conductive needle are fixed on the mounting seat, 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 coil lead-out wire connectors of the relay respectively.

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