A selective output circuit for a magnetic welding gun power supply chassis

Abstract

The present invention relates to a circuit for selective output of a power supply chassis of a magnetic welding gun. When the circuit is working, the main circuit is connected first, and selective interlocking distribution or interlocking delay distribution can be performed on the basis of meeting its own pot detection function requirements. There is only one output to ensure that the output is not overloaded. Not only does it ensure the impact on the power grid, but it also solves the troublesomeness of operation. The present invention can effectively solve the problem of unstable input voltage caused by the simultaneous use of two magnetic welding guns in tunnel construction, and the need to manually observe the light brightness for staggered welding. The present invention only needs to hook the gun switch to work, or wait for about two seconds of delayed output distribution. There is no need to consider the mutual influence between the two machines during construction. It also solves the problem of excessive power and inability to use the plug for safe electricity use caused by the combination of two power supplies.

Description

Technical Field

[0001] The invention relates to the field of water stop welding, and in particular to a selective output circuit of a power supply chassis of a magnetic welding gun. Background Art

[0002] The order of hanging waterproof panels in tunnels is to hang the top waterproof panels first, then the waterproof panels on the upper and middle sides of the left or right side, then the waterproof panels on the upper and middle sides of the right or left side, and finally the waterproof panels on the lower sides. Because the diameter of the tunnel is usually 10 meters (for example, the height of the secondary lining of a highway tunnel is 9 meters, and the width of the secondary lining is 16 meters), in such a large tunnel, after hanging waterproof panels on one side, the tools must be taken to the other side for construction. However, in order to get the magnetic welding gun to the opposite side, it is very inconvenient to climb on the racks on both sides of the high altitude, which not only wastes time but also increases the risk. Therefore, if conditions permit, two groups of workers will work on both sides at the same time, and two magnetic welding guns will be used, one on each side.

[0003] However, it was found during use that if two magnetic welding guns were welding at the same time, the input voltage would be unstable, because the tunnel is curved, the line is slender, and the line loss is large. This will affect the operation of both magnetic welding guns. In order to avoid the impact of simultaneous welding, workers currently choose staggered welding. The method of staggered electricity consumption is to observe the lighting. Because the rated power of the magnetic welding gun is 4000 watts, the normal working gear is about 3000 watts in the eighth gear (a total of 10 gears). When welding, it will affect the line power grid, making the light obviously dim. The workers will know that a magnetic welding gun is welding by observing the light, so the other worker with the gun will wait for the light to recover before welding. Workers on both sides need to wait for staggered welding during operation.

[0004] The above usage method brings some troubles to the workers, so there is an urgent need for a device that integrates two magnetic welding guns for operation. However, security inspection regulations stipulate that the rated power of single-phase electrical equipment using plugs shall not exceed 3500W. If it exceeds 3500W, the plug cannot be used. The magnetic welding gun is a single-phase high-power short-time welding tool, usually with a welding time of two seconds and a rest time of 20 seconds to several minutes.

[0005] Therefore, there is an urgent need for a multi-output magnetic welding gun power supply that can meet the use requirements on both sides without bringing about power consumption pressure, and at the same time can solve the problem of the trouble of using and locking the observation lighting when the magnetic welding guns on both sides of the tunnel stop.

[0006] The selective interlocking distribution and multi-output magnetic welding gun power supply technology of the present invention can be used not only in ordinary power supply chassis, but also in isolated heat dissipation power supply chassis. At the same time, it can also be used in self-dehumidification power supply chassis. At the same time, it can also be used in combination with over-under voltage circuits, and can be installed in an isolated heat dissipation self-dehumidification power supply chassis in combination with over-under voltage circuits. It can also be combined with a storage type magnetic welding gun power supply, and the storage type over-under voltage circuit combination is installed in an isolated heat dissipation self-dehumidification power supply chassis. Summary of the invention

[0007] To solve the above problems, the present invention proposes a selective output circuit and its branching device for a magnetic welding gun power supply chassis. The circuit and its branching device can perform selective interlocking distribution and / or output interlocking delay distribution on the basis of meeting the requirements of its own pot detection function, ensuring that there is only one output when there is no overload. This not only ensures the impact on the power grid, but also solves the troublesomeness of operation.

[0008] In order to ensure that the IGBT is not overloaded, an appropriate delay can be made to the output. The delay distribution means that after the first gun finishes working, the second gun will work after a delay, or after the second gun finishes working, the third gun will work after a delay. The delay is usually 0.5 seconds to two seconds.

[0009] The specific technical solutions are as follows:

[0010] A selective output circuit of a magnetic welding gun power supply chassis includes a main relay for controlling high frequency, two or more control relays, and at least one time delay relay; the high frequency main relay is controlled by at least one control relay, and at least one control relay is controlled by the time delay relay; the two or more control relays are respectively provided with output ports, and the two or more control relays are interlocked to control the output of only one port.

[0011] Furthermore, the control relays are all connected in parallel with anti-interference capacitors, and the anti-interference capacitors are preferably 0.2UF ceramic capacitors or inductors are connected in series after the parallel anti-interference capacitors; and inductors are connected in series before or after the electromagnetic coils of the control relays connected in parallel with the anti-interference capacitors.

[0012] It may also include a PLC controller, which controls the control relay through the PLC, and then the control relay controls the high-frequency main relay; or directly controls the high-frequency main relay or circuit board selection relay through the PLC; or the circuit board selection relay is independently controlled by a manual switch or a temperature control switch; or the control relay.

[0013] Further, the high-frequency main relay is an electromagnetic relay, and the relay is 1P, 2P, 3P, 4P, 5P or 6P;

[0014] Preferably, the high-frequency main relay is 1P, and the selection relays on the output selection relay circuit board are 2P or more and are connected in parallel into one or two paths, of which part is connected in parallel as the main circuit contact and part is used as the auxiliary contact;

[0015] The coil driving voltage of the selection relay on the high-frequency main relay and the output selection relay circuit board is: DC1.5V, DC3V, DC4.5V, DC6V, DC9V, DC12V, DC15V, DC18V, DC24V, DC36V, DC48V, DC75V, DC110V, DC240V, DC300V, DC380V, AC1.5V, AC3V, AC4.5V, AC6V, AC9V, ADC12V, AC15V, AC18V, AC24V, AC36V, AC48V, AC75V, AC110V, AC240V, AC300V or AC380V, preferably DC12V.

[0016] The high-frequency main relay (JH) and the selection relay (XJ) on the output selection relay circuit board are either electronic devices or solid-state relays or thyristors (thyristors) or power transistors (GTRs) or insulated gate field effect transistors (PMTRs) or insulated gate bipolar transistors (IGBTs).

[0017] Furthermore, the control relay is an electromagnetic relay, which can be 2P or above; the control relay may be an electronic component, which may be a solid-state relay or a thyristor (silicon controlled rectifier) ​​or a power transistor (GTR) or a gate-insulated field effect transistor (PMTR) or an gate-insulated bipolar transistor (IGBT).

[0018] Furthermore, the PLC has a delay program, and the delay program is used to control the delayed output.

[0019] Furthermore, the output ports are respectively connected to the main gun and the auxiliary gun of the magnetic welding gun, and the first hook gun switch between the main gun and the auxiliary gun works first, and the second hook gun switch will be interlocked to work after the first hook gun switch finishes working.

[0020] Furthermore, the output circuit of the main gun or the auxiliary gun is connected first, and the control circuit is connected later or with a delay;

[0021] The main relay is a normally closed contact connected to the main gun. When the main gun hooks the gun switch first, the main gun heating coil realizes immediate output through the main relay; or when the auxiliary gun finishes working and enters the main gun working, it is necessary to ensure a control signal delay of at least about 0.5 seconds to avoid burning out the main relay contacts and affecting the pot detection function; when there are two sets of circuit boards in the power supply chassis, the circuit boards are high-frequency power boards, which are divided into two independent circuit boards or two circuits integrated into one circuit board.

[0022] The main relay has normally closed contacts connected to the main gun. When the auxiliary gun hooks the gun switch first, the main gun heating coil is closed first and then output through the main relay. At least a control signal delay of about 0.5 seconds must be ensured to avoid burning out the main relay contacts and affecting the pot detection function.

[0023] Furthermore, the interlocking control is realized by an output selective interlocking distribution circuit, and the output selective interlocking distribution circuit is arranged in the power supply chassis or in an independent box of the branch outside the power supply chassis; the box is a plastic box or a metal box or a wooden box or an epoxy tree branch box or a rubber box or a silicone box.

[0024] Furthermore, the power supply chassis is provided with two or more output ports, and only one port is limited to output electrical signals during operation; a splitter can be plugged behind the output port, and another splitter can be plugged behind the splitter; the output port corresponds to at least one control relay or one channel in the PLC program.

[0025] In a circuit with two inputs and two outputs, the output can be prioritized to the IGBT with lower temperature, or it can be output in rotation, or one output can be given to the main gun and the other to the auxiliary gun.

[0026] Furthermore, the output port is a terminal post, a terminal block or a plug interface;

[0027] The plug interface is an aviation plug, a docking plug or an industrial plug;

[0028] The output port is a two-core plug, a three-core plug, a four-core plug, a five-core plug, a six-core plug, or a seven-core plug;

[0029] The output port is a common plug-in port for the high frequency and the control circuit, or the high frequency and the control circuit are divided into two plug-in ports.

[0030] The selective output circuit of the power supply chassis of a magnetic welding gun of the present invention and its branching device can be installed in a power supply chassis with over-voltage and under-voltage protection, and can also be plugged into the output port of the power supply chassis with over-voltage and under-voltage protection; can be installed in the power supply chassis of a light-emitting magnetic welding gun, and can also be plugged into the output port of the power supply chassis of a light-emitting magnetic welding gun; can be installed in a power supply chassis with isolated heat dissipation, and can also be plugged into the output port of the power supply chassis with isolated heat dissipation; can be installed in a power supply chassis with a tool compartment, and can also be plugged into the output port of the power supply chassis with a tool compartment for a magnetic welding gun; can be installed in a self-dehumidifying power supply chassis, and can also be plugged into the output port of the self-dehumidifying power supply chassis.

[0031] The power supply circuit and its branching device of the present invention can perform selective interlocking distribution or interlocking delayed distribution on the basis of meeting the requirements of its own pot detection function. There is only one output to ensure that the output is not overloaded. It not only ensures the impact on the power grid, but also solves the troublesomeness of operation. The present invention can effectively solve the problem of unstable input voltage caused by the simultaneous use of two magnetic welding guns in tunnel construction, and the need to manually observe the light brightness for staggered welding. The present invention can work by just hooking the gun switch, or waiting for about two seconds of delayed output distribution. There is no need to consider the mutual influence between the two machines during construction. It also solves the problem of safe electricity use when the power is too large when the two machines are combined and the plug cannot be used. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 Block diagram of the prior art;

[0033] Figure 2 A block diagram of the circuit connection method of the present invention;

[0034] Figure 3 Block diagram of the second circuit connection mode of the present invention;

[0035] Figure 4 Three block diagrams of the circuit connection method of the present invention;

[0036] Figure 5 Four block diagrams of the circuit connection method of the present invention;

[0037] Figure 6 The circuit connection method of the present invention is a block diagram of the fifth aspect;

[0038] Figure 7 Six block diagrams of the circuit connection method of the present invention;

[0039] Figure 8 Seven block diagrams of the circuit connection method of the present invention;

[0040] Fig. 9 Eight block diagrams of the circuit connection method of the present invention;

[0041] Fig.10Nine block diagrams of the circuit connection method of the present invention;

[0042] Fig.11 A block diagram of the circuit connection method of the present invention;

[0043] Fig.12 Circuit connection diagram of magnetic welding gun in the prior art;

[0044] Fig.13 One input port, two output ports select interlocking built-in distribution circuit schematic;

[0045] Fig.14 One input port, two dual-delay output ports select interlocking built-in distribution circuit schematic;

[0046] Fig.15 One input port, two dual-delay output ports, single delay relay selection interlock built-in distribution circuit schematic;

[0047] Fig.16 Two-way dual-delay output port uses only one delay relay output circuit schematic diagram;

[0048] Fig.17 Strictly limit the circuit schematic diagram of the magnetic welding gun working or firing;

[0049] Fig.18 PLC control schematic diagram of the present invention;

[0050] Fig.19 Schematic diagram of PLC control of dual circuit boards of the present invention;

[0051] Fig. 20 Schematic diagram of the output selection relay board of the present invention. DETAILED DESCRIPTION

[0052] like Figure 1 The above is a block diagram of a common circuit connection method in the prior art.

[0053] Figure 2 This is the circuit connection mode 1 of the present invention, which shares the circuit of the prior art, and only adds an output selection relay board and an output port block diagram; this circuit is simple and inexpensive.

[0054] Figure 3 This is the second circuit connection mode of the present invention, which shares the circuit of the prior art, and only adds a branch block diagram externally. The circuit is simple, cheap, and plug-and-play.

[0055] Figure 4 This is the circuit connection mode 3 of the present invention, the circuit of the double circuit technology, the built-in selection relay selects a circuit output port block diagram. This circuit is suitable for continuous welding, and the two sets of circuit boards can work alternately without overloading.

[0056] Figure 5 This is the circuit connection mode 4 of the present invention, the circuit of the double circuit technology, the shared panel parameters, the relay selection, or the low temperature circuit priority selection, the two circuit output port block diagram. Because during the construction, one of the gun-carrying workers is in a convenient position for operation, and or the welding speed is fast due to skilled work, which will cause the temperature of the IGBT and other components of the circuit board to be high, and the temperature of the other is low, so the low temperature circuit is preferred to protect the circuit from damage. This circuit is suitable for continuous welding, and the two sets of circuit boards can work in rotation without overload.

[0057] Figure 6 This is the circuit connection mode 5 of the present invention, the circuit of the double circuit technology, the branch selects a circuit output port block diagram. This circuit is suitable for continuous welding, the two sets of circuit boards can work alternately, plug and play without overload.

[0058] Figure 7 This is the circuit connection mode 6 of the present invention, the circuit of the double circuit technology, the splitter is selected in rotation, or the low-temperature circuit is preferred, and the block diagram of the two circuit output ports. Because during the construction, one of the gun-carrying workers is in a convenient position for operation, and the welding speed is fast because of his skilled work, which will cause the temperature of the IGBT and other components of the circuit board to be high, and the temperature of the other is low, so the low-temperature circuit is preferred to protect the circuit from damage. This circuit is suitable for continuous welding, the two sets of circuit boards can work in rotation, will not be overloaded, and the splitter is plug-and-play.

[0059] Figure 8 This is the circuit connection mode 7 of the present invention, the circuit of the double-set circuit technology, the dual-port input splitter alternately selects the four-port output, or the low-temperature circuit is preferred, the block diagram. Because during the construction, one of the gun-carrying workers is in a convenient position for operation, and or the welding speed is fast due to his skilled work, which will cause the IGBT and other components of the circuit board to have a high temperature, and the other temperature is low, so the low-temperature circuit is preferred to protect the circuit from damage. This circuit is suitable for continuous welding, the two sets of circuit boards can work alternately, will not be overloaded, and the splitter is plug-and-play.

[0060] Fig. 9 This is the circuit connection mode eight of the present invention, the circuit of the double-set circuit technology, the shared panel parameters, the dual-port input splitter alternately selects the four-port output, or the low-temperature circuit is preferred, the block diagram. Because during the construction, one of the gun-carrying workers is in a convenient position for operation, and or the welding speed is fast due to his skilled work, which will cause the temperature of the IGBT and other components of the circuit board to be high, and the temperature of the other is low, so the low-temperature circuit is preferred to protect the circuit from damage. This circuit is suitable for continuous welding, the two sets of circuit boards can work alternately, will not be overloaded, and the splitter is plug-and-play.

[0061] Fig.10 This is the circuit connection mode nine of the present invention, the circuit of the double-set circuit technology, the two splitters of the dual-port input alternately select the four-port output, or the low-temperature circuit is preferred, the block diagram. Because during the construction, one of the gun-carrying workers is in a convenient position for operation, and the welding speed is fast because of the skilled work, which will cause the IGBT and other components of the circuit board to have a high temperature and the other temperature to be low, so the low-temperature circuit is preferred to protect the circuit from damage. This circuit is suitable for continuous welding, the two sets of circuit boards can work alternately, it is not easy to overload, and the splitter is plug-and-play.

[0062] Fig.11 This is a block diagram of the circuit connection method of the present invention, a low-temperature circuit is preferably selected, a circuit of dual-set circuit technology, a shared panel parameter, a relay rotation selection, or a PLC control of the low-temperature circuit is preferably selected, and a block diagram of two circuit output ports. Because during construction, one of the gun-carrying workers is in a convenient position for operation, and or the welding speed is fast due to skilled work, which will cause the temperature of the IGBT and other components of the circuit board to be high, and the temperature of the other is low, so the low-temperature circuit is preferably selected to protect the circuit from being easily damaged. This circuit is suitable for continuous welding, and the two sets of circuit boards can work in rotation without overload.

[0063] Fig.12 This is the circuit connection diagram of the prior art. Requirements and description of circuit welding principles:

[0064] The main unit (power supply) of the magnetic welding gun is the same as the induction cooker, both of which are electromagnetic induction heating and have a pot detection function (a small pilot current is used to detect whether the circuit is unobstructed), but the method of pot detection is different. The induction cooker checks the pot about every five seconds. Frequent pot detection is not suitable for magnetic welding guns, because the indicator light on the gun head of the magnetic welding gun will flash every time the pot is checked, which will not only mislead the welding, but also be unsafe and annoying.

[0065] Therefore, the pot inspection of the magnetic welding gun is only carried out after each gun is fired, but the pot inspection time is very short, usually less than 0.1 seconds. In use, after the pot inspection, the circuit is unobstructed, and the welding high current welding output is immediately entered, so it is not noticed by the workers. If the circuit is not unobstructed after the pot inspection, the welding high current will not be output, and the corresponding fault light will flash.

[0066] Description of the working action principle: When the gun head switch is hooked, the J coil of the working relay is energized, the contact of the J of the working relay is closed, 16 and 18 are connected, and the optical coupler of the control board is connected, and welding starts. At the same time, another set of contacts of the J of the working relay is also closed 7 and 15, and the time relay delays the disconnection of contacts 17 and 18 to start timing. After the timing is over, contacts 17 and 18 of the J of the working relay are disconnected, and the optical coupler of the control board is disconnected, so that the magnetic welding gun enters the standby state. That is to say, when the time relay timing ends, the magnetic welding gun is in the standby state even if the gun head switch is hooked.

[0067] Fig.13 One input port, two output ports select interlocking built-in distribution circuit schematic, or external branch circuit schematic. Working action principle description:

[0068] When the main gun switch is welding, the relay ZJ coil of the main gun is energized through the normally closed relay contact FJ of the auxiliary gun, and the ZJ normally closed contact of the main gun in the auxiliary gun circuit opens, preventing the FJ coil of the auxiliary gun from being energized. At the same time, the ZJ normally open contact of the main gun in the working relay circuit closes, and the J coil of the working relay is energized to start working.

[0069] When the auxiliary gun switch is welding, the relay FJ coil of the main gun is energized through the normally closed relay contact ZJ of the main gun, and the normally closed contact FJ of the auxiliary gun in the main gun circuit is opened, preventing the ZJ coil of the main gun from being energized. At the same time, the normally open contact FJ of the auxiliary gun in the main relay JH and delay relay YJ circuits is closed, and the main relay JH and the delay relay YJ coil are energized. The main relay JH immediately closes its contacts, and the delay relay YJ closes its contacts after a delay, and the J coil of the working relay is energized to start working (the purpose of connecting the main circuit first and delaying the connection of the control circuit is achieved).

[0070] In addition, because the control line and high-frequency line of the magnetic welding gun are designed to use the same cable line, the inductive interference is serious during operation. In the prior art, the working relay J is connected to the cable line. The relay is a small relay with a larger head. When working, the coil maintains a relatively large current, so the anti-interference ability is strong. In the present invention, the small control relays ZJ and FJ are connected to the cable line. The control relays ZJ and FJ used in the present invention are only about one-tenth of the working relay J in the prior art. When working, the coil maintains a small current, so the anti-interference ability is low. The interference problem was ignored in the design, but it was found in the test that it would appear after being subjected to inductive interference. After firing, the control relay would have an induced voltage of about 6 volts, causing the contact to be unable to release. After the time relay timing is over, it is locked by the control relay. In the experiment, it was found that there is still a need to select anti-interference capacitors C1 and C2. Electrolytic capacitors are welded casually, and the capacitor explodes loudly as soon as it is turned on. Only the capacitor pins are left after the explosion, and the entire capacitor explodes into dust. After experimental testing, the best anti-interference capacitors C1 and C2 are selected, preferably 0.2UF ceramic chip capacitors.

[0071] Fig.14 One input port, two dual-delay output ports select interlocking built-in distribution circuit schematic diagram, working principle description: The two dual-delay outputs refer to Fig.13 A time delay relay YJ2 is connected in parallel to the time delay relay, and the contact of the time delay relay is used to replace the FJ contact in the main gun circuit. The detailed description is as follows:

[0072] When the main gun switch is welding, the relay ZJ coil of the main gun is energized through the normally closed relay contact YJ2 of the auxiliary gun, and the ZJ normally closed contact of the main gun in the auxiliary gun circuit opens, preventing the FJ coil of the auxiliary gun from being energized. At the same time, the ZJ normally open contact of the main gun in the working relay circuit closes, and the J coil of the working relay is energized to start working.

[0073] When the auxiliary gun switch is welding, the relay FJ coil of the main gun is energized through the normally closed relay contact ZJ of the main gun, and the normally open contact FJ of the auxiliary gun in the main relay JH, delay relay YJ and YJ2 circuit is closed, and the normally closed contact YJ2 in the main gun circuit is opened, preventing the ZJ coil of the main gun from being energized. At the same time, the main relay JH, delay relay YJ and YJ2 coil are energized, the main relay JH immediately closes its contacts, the delay relay YJ closes its contacts after a delay, the J coil of the working relay is energized, and starts working (the purpose of connecting the main circuit first and delaying the connection of the control circuit is achieved).

[0074] After the work is completed, the auxiliary gun switch is disconnected, and the delayed closing of the delay relay YJ2 in the main gun circuit further ensures that the main relay JH contact returns to its position.

[0075] The advantage of this circuit is that it improves the reliability of the main gun working immediately after the auxiliary gun finishes working.

[0076] Fig.15 One input port, two double-delay output ports use only one delay relay, select the interlock built-in distribution circuit schematic diagram, the two double-delay output ports use only one delay relay output, which means that Fig.13 The time delay relay is changed to dual-circuit dual control, that is, when the power is turned on, one set of normally open contacts is closed with a delay, and when the power is turned off, another set of normally closed contacts YJ is closed with a delay. The contact of the time delay relay is connected to the FJ contact in the main gun circuit. The detailed description is as follows:

[0077] When the main gun switch is welding, the relay ZJ coil of the main gun is energized through the normally closed relay contact FJ of the auxiliary gun and another set of normally closed contacts YJ. The normally closed contact ZJ of the main gun in the auxiliary gun circuit opens, and the FJ coil of the auxiliary gun is not energized. At the same time, the normally open contact ZJ of the main gun in the working relay circuit closes, and the J coil of the working relay is energized to start working.

[0078] When the auxiliary gun switch is welding, the relay FJ coil of the main gun is energized through the normally closed relay contact ZJ of the main gun, and the normally closed contact FJ of the auxiliary gun in the main gun circuit is opened, preventing the ZJ coil of the main gun from being energized. At the same time, the normally open contact FJ of the auxiliary gun in the main relay JH and delay relay YJ circuits is closed, and the main relay JH and the delay relay YJ coil are energized. The main relay JH immediately closes its contacts, and the delay relay YJ closes its contacts after a delay, and the J coil of the working relay is energized to start working (the purpose of connecting the main circuit first and delaying the connection of the control circuit is achieved).

[0079] After the work is completed, the auxiliary gun switch is disconnected, and the other group of delay relays YJ in the main gun circuit is delayed closed, further ensuring that the main relay JH contacts return to their original positions.

[0080] The advantage of this circuit is that it improves the reliability of the main gun working immediately after the auxiliary gun finishes working.

[0081] Fig.16 Two-way dual-delay output ports use only one delay relay output circuit description: In a DC12V circuit, when FJ is turned on, the electrolytic capacitor is charged through the resistor R. When the electrolytic capacitor C is charged to about 7V, the relay coil YJ can attract the contact, and the relay YJ achieves the purpose of delayed closing. The electrolytic capacitor C continues to charge through the resistor R until the voltage across the resistor R is zero.

[0082] In a DC12V circuit, when FJ is disconnected, the electrolytic capacitor supplies power to the relay YJ coil until the power of the electrolytic capacitor C is consumed to less than 7V. The coil of relay YJ releases the contacts, and relay YJ achieves the purpose of delayed disconnection. The electrolytic capacitor C continues to discharge to the relay coil until the power of the electrolytic capacitor C is consumed.

[0083] Fig.17 Considering that the magnetic welding gun is designed to work with high current for a short time, usually the working time is only two to four seconds, and the interval is 20 seconds to several minutes, so the magnetic welding gun IGBT is a small power single tube, and no module is used. Because the working frequency of the magnetic welding gun is relatively high, usually around 60KHZ, the module cannot reach the required frequency and can only work at around 20KHZ. It is also because the IGBT is a small power single tube and needs to work with high current, so there are strict restrictions on the continuous operation and continuous opening of the magnetic welding gun, otherwise it is easy to damage the IGBT. The factory test is to work for two seconds and the interval is 5 seconds, so the delay circuit can be connected in the coil of the main relay ZJ. Fig.13 It can work for two seconds, with an interval of more than 5 seconds. The rest period during normal work is 20 seconds to several minutes. Therefore, in normal use, you will not feel that the interval is delayed by more than 5 seconds. As long as it is shorter than the normal interval time, it will not affect the use.

[0084] When the working relay coil J and the delay relay coil YJ2 are energized at the same time, the contact of the working relay coil J is self-locking. After the delay relay coil capacitor is charged, the contact YJ2 is disconnected and will not close until the delay time is up (the delay relay capacitor is discharged). It is usually set at 2 seconds to 10 seconds, and the rest time is usually at least 20 seconds, so it will not affect the work. It can also limit the short-term dry gun and continuous operation to protect the IGBT.

[0085] Fig.18 The PLC control schematic diagram of the present invention, for the circuit controlled by PLC, its electrical control situation is as follows: when the main gun switch works first, the main gun heating coil outputs through the normally closed contact of the main relay, and the PLC controls the auxiliary gun not to output; when the auxiliary gun switch works first, the auxiliary gun heating coil outputs through the normally open contact of the main relay, and the PLC controls the main gun not to output; ensure that only one gun head works during the entire output.

[0086] The main relay of the main gun is a normally closed contact. When the main gun switch is working, the main gun heating coil can be output immediately through the main relay; when the auxiliary gun finishes working and enters the main gun working, the control signal delay of at least 0.5 seconds must be ensured through PLC control to ensure that the main relay contacts have sufficient closing and releasing time to avoid burning the main relay contacts and affecting the pot detection function.

[0087] The main relay of the auxiliary gun is a normally open contact. When the auxiliary gun switch is working, the auxiliary gun heating coil is first closed and then output through the main relay; the control signal delay of about 0.5 seconds is ensured through PLC control to ensure that the main relay contacts have sufficient closing and releasing time to avoid burning the main relay contacts and affecting the pot detection function.

[0088] The temperature of IGBT can also be monitored and controlled through PLC to adjust the interval between each firing.

[0089] Fig.19 The schematic diagram of PLC control of dual circuit boards of the present invention, for dual circuits controlled by PLC, the electrical control conditions are as follows:

[0090] The PLC can select the two circuit boards to work alternately through mode selection, or to work with the corresponding gun and circuit board fixedly, or to work with the circuit board with the lower IGBT temperature first. Then, one of the circuit boards is selected for output through the output selection relay XJ. The circuit board is a high-frequency power board, which can be divided into two independent circuit boards, or two circuits can be integrated on one circuit board.

[0091] The main relay of the auxiliary gun is a normally open contact. When the auxiliary gun switch is working, the auxiliary gun heating coil is first closed and then output through the main relay; the control signal delay of about 0.5 seconds is ensured through PLC control to ensure that the main relay contacts have sufficient closing and releasing time to avoid burning the main relay contacts and affecting the pot detection function.

[0092] Fig. 20 Schematic diagram of the output selection relay board of the present invention, the output selection relay board has at least one selection relay XJ

[0093] The output selection relay XJ coil can be controlled by a switch, which is a rotary switch, a sliding switch, a rocker switch, a push switch, a pull switch, a temperature control switch or a thermostat, a PLC or a control relay.

[0094] The selection relay XJ can be controlled by mode selection, or the IGBT heat sink can be monitored by a sensor, with the lower temperature working first, or the corresponding port of the circuit board is fixed to output through a switch.

[0095] The temperature of IGBT can also be monitored and controlled through PLC to adjust the interval between each firing.

[0096] The above describes in detail the preferred implementation of this patent, but this patent is not limited to the above implementation. Various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of this patent.

Claims

1. A selective output circuit of a magnetic welding gun power supply chassis, comprising a main relay for controlling high frequency, two or more control relays, and at least one delay relay, characterized in that: The high-frequency main relay is controlled by at least one control relay, and at least one control relay is controlled by a delay relay; the two or more control relays are respectively provided with output ports, and the interlocking control between the two or more control relays is limited to output at only one port; the output ports are respectively connected to the main gun and the auxiliary gun of the magnetic welding gun, and the first hook gun switch between the main gun and the auxiliary gun will work first, and the second hook gun switch will be interlocked until the first hook gun switch finishes working; the output main gun or auxiliary gun circuit is connected first, and the control circuit is connected later or delayed; The main relay is a normally closed contact leading to the main gun. When the main gun hooks the gun switch first, the main gun heating coil is output immediately through the main relay; or when the auxiliary gun finishes working and enters the main gun working, at least 0.5 seconds of control signal delay must be ensured to avoid burning the main relay contacts and affecting the pot detection function; the main relay is a normally closed contact leading to the main gun. When the auxiliary gun hooks the gun switch first, the main gun heating coil is closed first and then output through the main relay. At least 0.5 seconds of control signal delay must be ensured to avoid burning the main relay contacts and affecting the pot detection function; the interlock control is realized by an output selective interlock distribution circuit.

2. The selective output circuit of a magnetic welding gun power supply chassis according to claim 1, characterized in that: The control relays are all connected in parallel with anti-interference capacitors, which are 0.2UF ceramic capacitors; an inductor is connected in series before or after the electromagnetic coil of the control relay with the parallel anti-interference capacitor; a PLC controller is also included, which controls the control relay through the PLC, and then the control relay controls the high-frequency main relay; or the high-frequency main relay or circuit board selection relay is directly controlled by the PLC; or the circuit board selection relay is independently controlled by a manual switch or a temperature control switch.

3. The selective output circuit of a magnetic welding gun power supply chassis according to claim 1, characterized in that: The relay is 1P, 2P, 3P, 4P, 5P or 6P; the coil driving voltage of the selection relay on the high-frequency main relay and the output selection relay circuit board is: DC1.5V, DC3V, DC4.5V, DC6V, DC9V, DC12V, DC15V, DC18V, DC24V, DC36V, DC48V, DC75V, DC110V, DC240V, DC300V, DC380V, AC1.5V, AC3V, AC4.5V, AC6V, AC9V, ADC12V, AC15V, AC18V, AC24V, AC36V, AC48V, AC75V, AC110V, AC240V, AC300V or AC380V, The high-frequency main relay and the selection relay on the output selection relay circuit board are electronic devices or solid-state relays or thyristors or power transistors or insulated gate field effect transistors or insulated gate bipolar transistors.

4. The selective output circuit of a magnetic welding gun power supply chassis according to claim 1, characterized in that: The control relay is an electromagnetic relay, and the electromagnetic relay is 2P or above; the control relay may be an electronic component, and the electronic component may be a solid relay, a thyristor, a power transistor, an insulated gate field effect transistor, or an insulated gate bipolar transistor.

5. The selective output circuit of a magnetic welding gun power supply chassis according to claim 2, characterized in that: The PLC has a delay program, and the delay program is used to control the delayed high-frequency output; or a delay relay is set in the relay control circuit, and the delay relay has one, two, three, four or five.

6. The selective output circuit of a magnetic welding gun power supply chassis according to claim 5, characterized in that: When there are two sets of circuit boards in the power supply chassis, the circuit boards are high-frequency power boards, and the high-frequency power boards are divided into two independent circuit boards or two circuits are integrated into one circuit board.

7. The selective output circuit of a magnetic welding gun power supply chassis according to claim 1, characterized in that: The output selective interlock distribution circuit is arranged in a power supply chassis or in a separate box of a branch outside the power supply chassis; the box is a plastic box, a metal box, a wooden box, an epoxy resin box, a rubber box or a silicone box.

8. The selective output circuit of a magnetic welding gun power supply chassis according to claim 7, characterized in that: The output port is a terminal post, a terminal strip or a plug interface; the plug interface is an aviation plug, a docking plug or an industrial plug; the output port is a two-core plug, a three-core plug, a four-core plug, a five-core plug, a six-core plug or a seven-core plug; the output port is a high-frequency and a control circuit sharing one plug port or the high-frequency and the control circuit are divided into two plug ports.

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