CN204434668U - A kind of parallel resonance intermediate frequency welding thermal treatment unit - Google Patents
A kind of parallel resonance intermediate frequency welding thermal treatment unit Download PDFInfo
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- CN204434668U CN204434668U CN201520073997.3U CN201520073997U CN204434668U CN 204434668 U CN204434668 U CN 204434668U CN 201520073997 U CN201520073997 U CN 201520073997U CN 204434668 U CN204434668 U CN 204434668U
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Abstract
The utility model discloses a kind of parallel resonance intermediate frequency welding thermal treatment unit, comprise parallel resonance intermediate frequency power supply control unit, overcurrent protection sampling unit, temperature control unit, three-phase full-controlled rectifier bridge, DC filtering reactor, single-phase bridge inversion unit, temperature measuring unit and medium frequency induction heater.Medium frequency induction heater of the present utility model does not directly contact with by the metallic conduit heated, be fixed on outside metallic conduit insulating cotton, be that the electromagnetic transfer that produces through medium frequency induction heater of the medium frequency alternating current of 700Hz-2500Hz is to the metallic conduit workpiece that will heat frequency, electromagnetism produces electric energy through duct work induction, and electric energy is that heat energy is heat-treated at metallic conduit inner transformation thereupon.
Description
Technical field
The utility model relates to a kind of welding heat treatment unit, is a kind of parallel resonance intermediate frequency welding thermal treatment unit specifically, belongs to pipeline welding technical field of auxiliary equipment.
Background technology
Current China power station, chemical industry are built interalloy pipeline welding thermal treatment and are mainly adopted the additional insulating cotton of ceramic resistor well heater to carry out.Shortcoming is pipe welding seam inside and outside wall excessive temperature differentials, weld hardness is high, poor toughness, thermal treatment quality is low, the unrelieved stress of weld seam is large, many power stations just create crackle because this reason uses less than 10 years weld seams, can only cut off again to weld and even change whole piece pipeline (life should be 30 years).And this material relies on completely from ground imports such as Japan, the U.S., wastes huge; The haze that exploitation ceramic ore and porcelain piece arrange carbon and generation in kiln sintering procedure is serious to environmental disruption, and irrecoverable.Frangible and pottery that is that scrap cannot be recycled, and is decomposed hardly, then causes secondary pollution.
The series resonance thermal treatment intermediate frequency power supply frequency of a small amount of import is higher, and generally at more than 5000Hz, and working process medium frequency changes greatly, and is up to Hz more than 20000.Load inductance amount is less, the load inductance amount of a 35KW intermediate frequency power supply requires between 5 μ H-50 μ H, the external diameter 560mm of the main team pipe of China's 1,000,000 kilowatts of thermoelectricitys, thickness of pipe reaches 115mm, regulatory requirements induction heating width is more than 6 times of wall thickness, and ruhmkorff coil minimum width is 690mm, if meet the turn-to-turn distance that width must strengthen induction coil, workpiece temperature can be caused uneven, and power is little cannot meet processing requirement.Load line distributed inductance must not more than 10 μ H, and excessive inductance value can reduce workpiece heat power.And operating radius is little, specific position workpiece far away cannot be heat-treated, and imported product cost is higher.And the tank circuit inductive heater of series resonance and resonant capacitance are for being connected in series, once due to interference loss start pulse signal, the tank circuit stops concussion immediately, and thermal treatment can be forced to interrupt.
Usual power station chemical industry P91, P92 class high temperature steel postweld heat treatment temperature is about 760 DEG C, and Curie temperature 740 DEG C, the depth of penetration heating when 760 DEG C of constant temperature is 500 ÷ (frequencies)
1/2(mm); Visible frequencies is higher, diathermanous more shallow, and the inside and outside wall temperature difference of pipeline is larger, and thermal effectiveness is poorer.But the surface action of frequency more high capacity line is larger, and line can be overheated, current capacity declines.All employings water cable power supply of more than 35KW, due to first field bad environments of constructing, often because of artificial damage disorderly closedown.The induction heater of water-cooled is also because burst power-off fault can not get circulating water, and leakage to heat treated part makes its damage of quenching.
Utility model content
Technical problem to be solved in the utility model is, for the shortcoming that above prior art exists, a kind of parallel resonance intermediate frequency welding thermal treatment unit is proposed, only need change load inductance amount and resonance capacitance size, just lower resonant frequency can be obtained, make diathermanous comparatively dark, the inside and outside wall temperature difference and technique meet regulatory requirements, ensure pipeline welding construction quality.
The technical scheme that the utility model solves above technical problem is: provide parallel resonance intermediate frequency to weld thermal treatment unit; comprise parallel resonance intermediate frequency power supply control unit, overcurrent protection sampling unit, temperature control unit, three-phase full-controlled rectifier bridge, DC filtering reactor, single-phase bridge inversion unit, temperature measuring unit and medium frequency induction heater
Described overcurrent protection sampling unit is arranged on the three-phase alternating current of the end of incoming cables of described three-phase commutation bridge; the signal output part of overcurrent protection sampling unit is connected with described parallel resonance intermediate frequency power supply control unit; on the AC signal that described overcurrent protection collecting unit is obtained through secondary booster by the electric current of a mutual inductor collection after pull-up resistor is decayed again and voltage transformer, the voltage signal that obtains turns off rectifying circuit and inverter circuit, to prevent load overcurrent, overvoltage after the rectification of intermediate frequency power supply control unit contrasts in good time.Frequency meter, medium frequency voltmeter instruction real-time working parameter;
The signals collecting termination of described intermediate frequency power supply control unit in parallel is by sending output signal by temperature control unit, described temperature control unit comprises signal filtering and actuator temperature controller, the signal input part of described traffic filter is connected with thermometric unit by compensating lead wire, the signal output part of described traffic filter is connected with described temperature controller signal input part, at the output terminal of a described temperature controller resistance in parallel, and acquisition low-voltage signal is connected to the power regulating signals input terminus of intermediate frequency power supply control unit in parallel;
Described intermediate frequency power supply control unit in parallel sends commutating pulse according to the signal of temperature control unit collection and triggers described three-phase full-controlled rectifier bridge, described three-phase full-controlled rectifier bridge is made up of three silicon controlled modules and capacitance-resistance overvoltage crowbar, the three-phase of three-phase alternating current is connected with three silicon controlled modules respectively, silicon controlled rectifier in each silicon controlled module is all parallel with capacitance-resistance overvoltage crowbar, converts three-phase alternating current to direct current through described three-phase full-controlled rectifier bridge;
The direct current exported from described three-phase full-controlled rectifier bridge through DC filtering reactor to described single-phase bridge inversion unit, described single-phase bridge inversion unit primarily of four quick silicon controlled rectifiers and with four respectively capacitance-resistance overvoltage crowbar in parallel with described quick silicon controlled rectifier form, described four quick silicon controlled rectifiers between two one group be connected in parallel, quick silicon controlled rectifier in the inversion trigger pulse triggers half-bridge converter sent by intermediate frequency power supply control unit in parallel, two groups of quick silicon controlled rectifier lead lines are connected described medium frequency induction heater with after resonant capacitance parallel connection, described quick silicon controlled rectifier, the 700Hz-2500Hz medium frequency heating power source that resonant capacitance and medium frequency induction heater effect produce, by heating duct work in described medium frequency induction heater, the temperature of duct work to be heated feeds back to described temperature control unit by described temperature measuring unit through compensating lead wire.
Medium frequency induction heater of the present utility model does not directly contact with by the metallic conduit heated, be fixed on outside metallic conduit insulating cotton, be that the electromagnetic transfer that produces through medium frequency induction heater of the medium frequency alternating current of 700Hz-2500Hz is to the metallic conduit workpiece that will heat frequency, electromagnetism produces electric energy through duct work induction, and electric energy is that heat energy is heat-treated at metallic conduit inner transformation thereupon.
The technical scheme that the utility model limits further is: aforesaid parallel resonance intermediate frequency welding thermal treatment unit, described temperature measuring unit is K calibration, string diameter is more than or equal to Φ 0.5mm, and length is more than or equal to 600mm, and described thermopair is connected with temperature control unit by KC series or the serial compensating lead wire of KX; The hot junction direct spot welding of thermopair is on the temperature controlling point of alloy pipeline, after thermal treatment completes, solder joint must be polished clean, the layout trend of thermopair is vertical with medium frequency induction heater coil, cold junction positive and negative electrode is connected with compensating lead wire positive and negative electrode, the other end positive and negative electrode of wire is connected on temperature measuring unit thermopair input terminal, and the temperature of pipe welding seam is just sent to temperature control unit with the form of millivolt signal.
Aforesaid parallel resonance intermediate frequency welding thermal treatment unit, described silicon controlled module adopts MTC silicon controlled module, and described quick silicon controlled rectifier adopts the quick silicon controlled rectifier of KK, and is provided with scatterer, forced air cooling on described MTC silicon controlled module and the quick silicon controlled rectifier of KK.
Aforesaid parallel resonance intermediate frequency welding thermal treatment unit, described single-phase bridge inversion unit be provided with EF power sampling unit between described resonant capacitance and be connected with described parallel resonance intermediate frequency power supply control unit, the instruction such as the frequency current voltage power table in EF power sampling unit thermal treatment unit real-time working parameter; Be provided with at least four quick silicon controlled rectifiers in described single-phase bridge inversion unit, each quick silicon controlled rectifier is connected with the branch road of an inverter bridge respectively.
Aforesaid parallel resonance intermediate frequency welding thermal treatment unit, the power supply of described parallel resonance intermediate frequency power supply control unit connects power supply by single phase ac transformer.
Further, aforesaid parallel resonance intermediate frequency welding thermal treatment unit, is also provided with splitter between described three-phase full-controlled rectifier bridge and DC filtering reactor, described splitter connects respectively by DC ammeter and D.C. voltmeter; Described intermediate frequency power supply control unit in parallel is MPU-6, PMU-7,1016 or PBX6M-1 type parallel resonance intermediate frequency power supply switchboard, or can meet and have 6 tunnel rectifier and trigger pulses, and 2 tunnel inversion tripping pulses have the intermediate frequency power supply switchboard of overcurrent, overvoltage protection; The Power Regulation signal sent by temperature controller, to intermediate frequency control unit, after calculation, sends 6 corresponding rectifier and trigger pulses to the silicon controlled module of 3 in three-phase full-controlled rectifier bridge.
The beneficial effects of the utility model are:
Core high power semi-conductor part cost of the present utility model is low, anti-interference strong, stable performance, non-maintaining; Only need change load inductance amount and resonance capacitance size, just lower resonant frequency can be obtained, scope is between 700Hz-2500Hz, diathermanous darker, the inside and outside wall temperature difference and technique meet regulatory requirements, ensure that construction quality, energy 100% eliminates the unrelieved stress of weld seam, can be down to HB200(or lower for P92 material compo pipe wall thickness 140mm weld hardness).
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the utility model thermal treatment unit.
Fig. 2 is the circuit diagram of the thermal treatment unit of embodiment 1.
Embodiment
embodiment 1
The present embodiment provides a kind of parallel resonance intermediate frequency to weld thermal treatment unit, as depicted in figs. 1 and 2, comprise parallel resonance intermediate frequency power supply control unit, overcurrent protection sampling unit, temperature control unit, three-phase full-controlled rectifier bridge, DC filtering reactor, single-phase bridge inversion unit, temperature measuring unit and medium frequency induction heater, the power supply of parallel resonance intermediate frequency power supply control unit connects power supply by single phase transformer;
Overcurrent protection sampling unit is arranged on the three-phase alternating current of the end of incoming cables of three-phase commutation bridge; the signal output part of overcurrent protection sampling unit is connected with parallel resonance intermediate frequency power supply control unit; overcurrent protection collecting unit to be boosted through secondary 50 times by the 0-5A electric current of a mutual inductor collection and after pull-up resistor is decayed, obtains the voltage signal that the AC signal of 0-5V and voltage transformer obtain again after the rectification of intermediate frequency power supply control unit contrasts, turn off rectifying circuit and inverter circuit, to prevent load overcurrent, overvoltage in good time.Frequency meter, medium frequency voltmeter instruction real-time working parameter;
The signals collecting termination of intermediate frequency power supply control unit in parallel is by sending output signal by temperature control unit, temperature control unit comprises signal filtering and actuator temperature controller, temperature controller adopts Xiamen space electricity AI-516 series, or selects other models else and can meet that the input of K type thermocouple signal, temperature controlling range 0-800 are DEG C above, the temperature control instrument able to programme of retroaction output 4-20mA; Traffic filter adopts interchange AC2A1, AC2A3 of LC inductance capacitance type ... or direct current DC2A1, DC2A3 ... require as electric current >=0.5A, voltage >=100V, inductance value >=10uh, electric capacity >=680P filter module, the strong magnetic interference distorted signal that main elimination is sent by medium frequency induction heater, load wire, make cut-in temperature millivolt signal become level and smooth, deliver to temperature controller thermopair input terminus exactly.The signal input part of traffic filter is connected with thermometric unit by compensating lead wire, the signal output part of traffic filter is connected with temperature controller signal input part, temperature controller output terminal and connect 1K Ω pull-up resistor, adjustment temperature controller exports upper and lower amplitude limit, makes its signal changing 0-13V into be connected to the power regulating signals input terminus of intermediate frequency power supply control unit in parallel;
Intermediate frequency power supply control unit in parallel sends commutating pulse according to the signal of temperature control unit collection and triggers three-phase full-controlled rectifier bridge, three-phase full-controlled rectifier bridge is made up of three MTC silicon controlled modules and capacitance-resistance overvoltage crowbar, the three-phase of three-phase alternating current is connected with three MTC silicon controlled modules respectively, silicon controlled rectifier in each MTC silicon controlled module is all parallel with capacitance-resistance overvoltage crowbar, converts three-phase alternating current to direct current through three-phase full-controlled rectifier bridge; The MTC silicon controlled module adopted needs to reach following salient features: quality is national standard, rated current IT (AV)/IF (AV) >=200A, repeat not forward voltage VDRM/VRRM >=1200V, 2 KP pipe series connection are equivalent in each module, control line K1G1 to K6G6 is connected with intermediate frequency control unit, insulating radiation device, forced air cooling.6 groups are carried out anti-overvoltage protection by the RC overvoltage crowbar that capacitance resistance is in series to rectification thyristor; The direct current exported from rectifier bridge through the DC filtering reactor of more than 160A4mh to half-bridge converter unit;
From three-phase full-controlled rectifier bridge export direct current through DC filtering reactor to single-phase bridge inversion unit, single-phase bridge inversion unit primarily of four quick silicon controlled rectifiers of KK and with four respectively silicon controlled rectifier quick with KK capacitance-resistance overvoltage crowbar in parallel form, KK tetra-quick silicon controlled rectifiers between two one group be connected in parallel, quick silicon controlled rectifier in the inversion trigger pulse triggers half-bridge converter sent by intermediate frequency power supply control unit in parallel, wherein four quick silicon controlled rectifier parameters of KK are rated current IT (AV) >=300A, repeat not forward voltage VDRM/VRRM >=1600V, turn-off time Tq≤30us.The inversion pulse signal that intermediate frequency control unit sends is connected to 4 quick SCR control of KK and extremely goes up after 2 groups of transformer isolation, SCR7 and SCR8 is one group, SCR9 and SCR10 is one group, and these 2 groups of KK pipes control alternate conduction, with withstand voltage >=750V by intermediate frequency control unit; Frequency >=2500Hz; Capacity is more than or equal to 500Kvar, be less than or equal to the inductance value of the resonant capacitance of 1200Kvar and its parallel connection is more than or equal to 70uh, is less than or equal to 200uh medium frequency induction heater and interacts, and produces 700Hz-2500Hz intermediate frequency power supply and heats pipe welding seam.On KK silicon controlled rectifier both sides, conductive heat sink is installed, forced air cooling.Four groups are carried out effective anti-overvoltage protection by the RC overvoltage crowbar that capacitance resistance is in series to KK silicon controlled rectifier.The Temperature Feedback of pipe welding seam, to temperature control unit, forms closed loop Medium frequency induction pipeline welding thermal treatment temp automatic control system; Two groups of quick silicon controlled rectifier lead lines are connected medium frequency induction heater with after resonant capacitance parallel connection, the 700Hz-2500Hz medium frequency heating power source that quick silicon controlled rectifier, resonant capacitance and medium frequency induction heater effect produce heats duct work by medium frequency induction heater, and the temperature of duct work to be heated feeds back to temperature control unit by temperature measuring unit through compensating lead wire.
Also be provided with splitter between three-phase full-controlled rectifier bridge and DC filtering reactor, splitter connects DC ammeter and D.C. voltmeter respectively.
The system power supply of the present embodiment must according to first open control loop, after open master loop, must first break master loop, this order of rear disconnected control loop of power-off is carried out, and no side can damage equipment.Control often to drive button in power switch circuit for " controlling power supply to open ", normally closed button is " controlling power supply to close ", and 1J controls power supply relay.Main power switch circuit is supplied power to through 1J normally opened contact.Often drive button in main power switch circuit for " primary source leaves ", normally closed button is " primary source pass ", and 1C is primary source contactor.One of 1C auxiliary often opens in parallel with " controlling power supply to close ", and another of 1C is assisted and often opened and " primary source leaves " self-locking.Another of 1J is auxiliary often to be opened and " controlling power supply to open " self-locking.When opening medium-frequency heat processing equipment power supply, must first open " controlling power supply to open ", at this moment, after intermediate frequency control unit, temperature control unit, main power switch circuit and radiator fan group normal power supply and then open " primary source leaves ", rear 1C contactless coil adhesive opened by primary source, master loop normal power supply.During turn-off apparatus, must first press " primary source breaks ", then by " controlling power supply to break ".If mishandle first opens master loop; due to the non-adhesive of control loop contactor, to can not get power operation invalid, as first turned off control loop, now " controls power supply to close " to be pinned operation by master loop normally opened contact 1C invalid; therefore mishandle is all ignored, effectively protect equipment.
Medium frequency induction heater electrical conductor adopts multiply annealed copper wire or the aluminum steel system of stirring to reach certain cross section, wraps up high temperature insulating material and carry out effective and safe insulation processing outside wire, and high temperature insulating material can exchange one minute and do not puncture by withstand voltage 2000V; The cross section of wire can be selected, heater conductor cross section (mm according to heating power size
2) copper: be more than or equal to maximum heating power (KW) corresponding numerical value × 0.8, be less than or equal to maximum heating power (KW) corresponding numerical value × 2.Aluminium matter: be more than or equal to maximum heating power (KW) corresponding numerical value × 1, is less than or equal to maximum heating power (KW) corresponding numerical value × 2.
Example 60KW power copper section generally selects 48mm
2above (60 × 0.8), 80KW power copper section is at 64mm
2above (80 × 0.8), 100KW power copper section is at 80mm
2above (100 × 0.8), by that analogy.Economic voltage loss is too little easily to be caused load coil overheated and burns out insulation, uneconomical too greatly, frock difficulty.
Medium frequency induction heater line length=3.14 × D × N(permissible error+10%)
N=(L×l+0.45×l×D)
1/2÷(0.083×D)
D=induction heater coils interior diameter (cm) in formula=by water back external diameter+insulation thickness × 2
The inductance value (μ h) of l=induction heater
The width (cm) of L=induction heater
The number of turn (circle) of N=induction heater
In addition to the implementation, the utility model can also have other embodiment.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of the utility model requirement.
Claims (9)
1. a parallel resonance intermediate frequency welding thermal treatment unit; comprise parallel resonance intermediate frequency power supply control unit, overcurrent protection sampling unit, temperature control unit, three-phase full-controlled rectifier bridge, DC filtering reactor, single-phase bridge inversion unit, temperature measuring unit and medium frequency induction heater, it is characterized in that:
Described overcurrent protection sampling unit is arranged on the three-phase alternating current of the end of incoming cables of described three-phase commutation bridge, the signal output part of overcurrent protection sampling unit is connected with described parallel resonance intermediate frequency power supply control unit, and on the AC signal that described overcurrent protection collecting unit is obtained through secondary booster by the electric current of a mutual inductor collection after pull-up resistor is decayed again and voltage transformer, the voltage signal that obtains turns off rectifying circuit and inverter circuit after the rectification of intermediate frequency power supply control unit contrasts in good time;
Described intermediate frequency power supply control unit collection terminal in parallel accepts to send output signal by temperature control unit, described temperature control unit comprises traffic filter and temperature controller, the signal input part of described traffic filter is connected with thermometric unit by compensating lead wire, the signal output part of described traffic filter is connected with described temperature controller signal input part, at the output terminal of a described temperature controller resistance in parallel, and acquisition low-voltage signal is connected to the power regulating signals input terminus of intermediate frequency power supply control unit in parallel;
Described intermediate frequency power supply control unit in parallel sends commutating pulse according to the signal of temperature control unit collection and triggers described three-phase full-controlled rectifier bridge, described three-phase full-controlled rectifier bridge is made up of three silicon controlled modules and capacitance-resistance overvoltage crowbar, the three-phase of three-phase alternating current is connected with three silicon controlled modules respectively, silicon controlled rectifier in each silicon controlled module is all parallel with capacitance-resistance overvoltage crowbar, converts three-phase alternating current to direct current through described three-phase full-controlled rectifier bridge;
The direct current exported from described three-phase full-controlled rectifier bridge through DC filtering reactor to described single-phase bridge inversion unit, described single-phase bridge inversion unit forms primarily of four quick silicon controlled rectifiers with four capacitance-resistance overvoltage crowbars in parallel with described quick silicon controlled rectifier respectively, described four quick silicon controlled rectifiers between two one group be connected in parallel, quick silicon controlled rectifier in the inversion trigger pulse triggers half-bridge converter sent by intermediate frequency power supply control unit in parallel, two groups of quick silicon controlled rectifier lead lines are connected described medium frequency induction heater with after resonant capacitance parallel connection, by heating duct work in described medium frequency induction heater, the temperature of duct work to be heated feeds back to described temperature control unit by described temperature measuring unit through compensating lead wire.
2. parallel resonance intermediate frequency welding thermal treatment unit according to claim 1, is characterized in that: described temperature measuring unit is that string diameter is more than or equal to Φ 0.5mm; Length is more than or equal to the K type thermocouple of 600mm, and described thermopair is connected with temperature control unit by KC series or the serial compensating lead wire of KX.
3. parallel resonance intermediate frequency welding thermal treatment unit according to claim 1, it is characterized in that: described silicon controlled module adopts MTC silicon controlled module, described quick silicon controlled rectifier adopts the quick silicon controlled rectifier of KK, and is provided with scatterer on described MTC silicon controlled module and the quick silicon controlled rectifier of KK.
4. parallel resonance intermediate frequency according to claim 1 welding thermal treatment unit, is characterized in that: described single-phase bridge inversion unit be provided with EF power sampling unit between described resonant capacitance and be connected with described parallel resonance intermediate frequency power supply control unit.
5. parallel resonance intermediate frequency welding thermal treatment unit according to claim 1, is characterized in that: the power supply of described parallel resonance intermediate frequency power supply control unit connects power supply by single phase ac transformer.
6. parallel resonance intermediate frequency welding thermal treatment unit according to claim 1, it is characterized in that: be provided with at least four quick silicon controlled rectifiers in described single-phase bridge inversion unit, each quick silicon controlled rectifier is connected with the branch road of an inverter bridge respectively.
7. parallel resonance intermediate frequency welding thermal treatment unit according to claim 1, is characterized in that: be also provided with splitter between described three-phase full-controlled rectifier bridge and DC filtering reactor, described splitter connects respectively by DC ammeter and D.C. voltmeter.
8. parallel resonance intermediate frequency according to claim 1 welding thermal treatment unit, is characterized in that: described intermediate frequency power supply control unit in parallel is MPU-6, PMU-7,1016 or PBX6M-1 type parallel resonance intermediate frequency power supply switchboard.
9. parallel resonance intermediate frequency welding thermal treatment unit according to claim 1, is characterized in that: the frequency of described medium frequency induction heater driving power is 700Hz-2500Hz.
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| CN201520073997.3U CN204434668U (en) | 2015-02-02 | 2015-02-02 | A kind of parallel resonance intermediate frequency welding thermal treatment unit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104561470A (en) * | 2015-02-02 | 2015-04-29 | 扬中市盛达电器制造有限责任公司 | Parallel resonance intermediate-frequency welding heat treatment device |
| CN114214488A (en) * | 2021-11-19 | 2022-03-22 | 十堰天舒感应设备有限公司 | Brake shoe induction heat treatment equipment and operation method thereof |
-
2015
- 2015-02-02 CN CN201520073997.3U patent/CN204434668U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104561470A (en) * | 2015-02-02 | 2015-04-29 | 扬中市盛达电器制造有限责任公司 | Parallel resonance intermediate-frequency welding heat treatment device |
| CN104561470B (en) * | 2015-02-02 | 2017-02-15 | 扬中市盛达电器制造有限责任公司 | Parallel resonance intermediate-frequency welding heat treatment device |
| CN114214488A (en) * | 2021-11-19 | 2022-03-22 | 十堰天舒感应设备有限公司 | Brake shoe induction heat treatment equipment and operation method thereof |
| CN114214488B (en) * | 2021-11-19 | 2024-04-12 | 湖北天舒感应科技股份有限公司 | Brake shoe induction heat treatment equipment and operation method thereof |
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