Welding power supply device with short circuit protection function

Abstract

The application discloses a welding power supply device with short-circuit protection function, which comprises a welding box, a power supply unit, a voltage and current display, a transformer, a fuse, an overcurrent relay and a thermistor unit, the power supply unit is installed on the inner upper side of the welding box, a control panel is arranged in the welding box, the voltage and current display is connected with the control panel, a main circuit is connected outside the transformer, the fuse is arranged in the main circuit, a connecting port is arranged outside the welding box, the main circuit is connected with the connecting port through internal wiring, and the overcurrent relay is arranged in series on the main circuit; the thermistor unit is installed in parallel with the overcurrent relay on the same section of the main circuit; the welding power supply device can realize double short-circuit protection, the thermistor unit arranged in parallel on the main circuit can freely adjust the series or parallel monitoring of the variable resistance unit with different resistance values, effectively cope with the problems of instantaneous large current and overheating, and reduce the possibility of false triggering.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of welding power supply, and particularly relates to a welding power supply device with a short-circuit protection function. BACKGROUND

[0002] The welding power supply is a very important device in the welding process, which provides the required electric energy for the welding process; at present, the welding power supply device is usually composed of a main circuit, a control system, a short-circuit protection system and the like; and the existing short-circuit protection system plays an important role in ensuring the safety of the device and the operator, and when a short circuit is detected, the short-circuit protection system can quickly cut off the power supply to prevent the device from being damaged or a fire being caused by excessive current;

[0003] However, the short-circuit protection of most welding power supplies in the prior art is too single, and in some welding conditions, the instantaneous large current generated, such as frequent start-stop of the welding power supply or frequent adjustment of the welding parameters, can cause the short-circuit protection system to misjudge as a short circuit, thereby causing unnecessary downtime; and most welding power supply devices adopt the method of prolonging the detection time window to avoid excessive sensitivity to large current, but this can affect the reaction time of the short-circuit protection system after detecting abnormal current, thereby causing damage to the device or the weld joint before the protection mechanism is started.

[0004] Therefore, it is necessary to provide a welding power supply device with a short-circuit protection function to solve the problems in the background art. SUMMARY

[0005] To achieve the above-mentioned purpose, the application provides the following technical scheme: a welding power supply device with a short-circuit protection function, which comprises a welding box, a power supply unit, a voltage and current display, a transformer, a fuse, an overcurrent relay and a thermistor unit, the power supply unit is installed on the upper side of the inside of the welding box, a control panel is arranged in the welding box, and the voltage and current display is connected with the control panel;

[0006] The transformer is connected below the power supply unit, a main circuit is connected outside the transformer, the fuse is arranged in the main circuit, a connection port is arranged outside the welding box, the main circuit is connected with the connection port through internal wiring, and the overcurrent relay is arranged in series on the main circuit.

[0007] The thermistor unit is installed in parallel with the overcurrent relay on the same section of the main circuit.

[0008] Further, as a preferred, the thermistor unit comprises:

[0009] A mounting cylinder seat is internally provided with a plurality of mounting holes;

[0010] A variable resistance unit is fixed in each mounting hole.

[0011] cover plates coaxially arranged at both ends of the mounting cylinder seat;

[0012] axle end covers corresponding to the cover plates, the axle end covers are rotatably connected to the cover plates, the middle part of the mounting cylinder seat is rotatably connected with a connecting rod, and two ends of the connecting rod are fixed with the axle end covers;

[0013] connecting leads connected to the outside of the axle end covers.

[0014] Further, as a preferred, the cover plate is provided with a connecting piece at each mounting hole, and the connecting piece is connected with the positive and negative poles of the variable resistance unit.

[0015] Further, as a preferred, a plurality of series connection plates are circumferentially distributed on the two axle end covers, and two first contacts are fixed on each series connection plate.

[0016] The number of series connection plates is half of the number of mounting holes.

[0017] The middle part of the axle end cover is fixed with a parallel ring, and a plurality of second contacts are distributed on the parallel ring.

[0018] Further, as a preferred, the two first contacts of each series connection plate can be connected with the positive or negative poles of the adjacent two variable resistance units.

[0019] Further, as a preferred, each second contact on the parallel ring is provided with a connecting piece one by one, and when each first contact is in contact with the connecting piece, the second contact is staggered with the connecting piece.

[0020] Further, as a preferred, the variable resistance unit comprises:

[0021] two outer shaft plates are symmetrically arranged, and the two outer shaft plates are electrically connected with the connecting piece;

[0022] a central shaft is rotatably connected between the two outer shaft plates, and two positioning rings are coaxially fixed at both ends of the central shaft, and a plurality of connecting holes are formed in the positioning rings;

[0023] a connecting guide column is fixed in the connecting hole of each positioning ring, and a mounting slot is formed in the connecting guide column;

[0024] a conductive piece is symmetrically fixed in the mounting slot, a thermistor is detachably mounted in each mounting slot, and the thermistor is electrically connected with the conductive piece;

[0025] an inner contact is eccentrically fixed on one side end face of each outer shaft plate close to the connecting guide column.

[0026] Further, as preferred, the outer shaft plate is externally provided with a driving part, which is connected in transmission with the central shaft through gear meshing.

[0027] Further, as preferred, the resistance values of the thermal resistors inside the connecting guide column are different.

[0028] Compared with the prior art, the present application has the following advantages:

[0029] In the present application, the main circuit of the welding box is provided with a fuse and an overcurrent relay in series, which can realize double short circuit protection, can handle rapid cutting in extreme cases, and can achieve accurate protection in daily operation, ensuring the stability and safety of the system; In the present application, the overcurrent relay on the main circuit is further provided with a thermal resistor unit in parallel, which can freely adjust the series or parallel monitoring of the variable resistance unit with different resistance values, effectively cope with the problem of instantaneous large current and overheating, thereby maintaining stable performance under complex working conditions, reducing the possibility of false triggering, and improving the reliability and durability of the entire welding system. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of the present application;

[0031] Figure 2 It is a schematic diagram of the internal structure of the thermal resistor unit in the present application;

[0032] Figure 3 It is a schematic diagram of the structure distribution of the connecting piece in the present application;

[0033] Figure 4 It is a schematic diagram of the structure of the shaft end cover in the present application;

[0034] Figure 5 It is Figure 4 It is an enlarged schematic diagram of structure A in the present application;

[0035] In the figure: 1, welding box; 11, power supply unit; 12, voltage and current display; 13, fuse; 14, connection port; 15, overcurrent relay; 2, thermal resistor unit; 21, mounting cylinder seat; 22, cover plate; 23, connecting piece; 24, connecting rod; 25, connecting lead; 3, variable resistance unit; 31, outer shaft plate; 32, central shaft; 33, positioning ring; 34, connecting guide column; 35, conductive piece; 36, thermal resistor; 37, inner contact; 4, shaft end cover; 41, series plate; 42, first contact; 43, parallel ring; 44, second contact. DETAILED DESCRIPTION

[0036] Please refer to Figures 1-5The welding power supply device with short circuit protection function in the embodiment of the application comprises a welding box 1, a power supply unit 11, a voltage and current display 12, a transformer, a fuse 13, an overcurrent relay 15 and a thermistor unit 2, the power supply unit 11 is installed on the upper side of the inside of the welding box 1, the welding box 1 is provided with a control panel, the voltage and current display 12 is connected with the control panel, and the voltage and current display 12 can display the voltage and current values in the welding process in real time; the control panel can dynamically adjust the welding parameters according to the real-time monitoring data (such as voltage, current, temperature and the like), and optimize the welding effect. For example, when the current fluctuation is detected, the control panel can automatically adjust the output current to maintain the stability of the electric arc; and the operator can intuitively understand the current welding state through the voltage and current display 12, and timely find and solve potential problems.

[0037] The transformer is connected below the power supply unit 11, and a main circuit is connected outside the transformer, the main circuit is provided with the fuse 13, the fuse 13 can be rapidly fused when serious short circuit or excessive current occurs, the power supply is immediately cut off, further damage of the circuit and the equipment is prevented, the response speed of the fuse 13 is very fast, the fuse 13 can act within milliseconds, and the welding power supply and the related equipment are effectively protected; the welding box 1 is provided with a connection port 14 outside, the main circuit is connected with the connection port through internal wiring, and the overcurrent relay 15 is arranged in series on the main circuit, the overcurrent relay 15 can set a specific current threshold value, when the current exceeding the set value is detected, the overcurrent relay 15 will trigger action, the circuit is cut off or an alarm is sent.

[0038] The thermistor unit 2 is installed in parallel with the overcurrent relay 15 on the same section of the main circuit, the thermistor can monitor the temperature change in real time, and feed back the temperature information to the control system, the thermistor can trigger the overheat protection mechanism in the welding, the power supply is timely cut off or an alarm is sent, and the equipment is prevented from being damaged due to overheating.

[0039] In the embodiment, the thermistor unit 2 comprises:

[0040] A mounting cylinder base 21, a plurality of mounting holes are formed in the inner circumference of the mounting cylinder base 21;

[0041] A variable resistance unit 3 is fixed in each mounting hole;

[0042] A cover plate 22 is coaxially arranged at both ends of the mounting cylinder base 21;

[0043] An axle end cover 4 is arranged in one-to-one correspondence with each cover plate 22, the axle end cover 4 is rotationally connected outside the cover plate 22, a connecting rod 24 is rotationally connected to the middle part of the mounting cylinder base 21, and the two ends of the connecting rod 24 are respectively fixed with each axle end cover 23;

[0044] A connecting lead 25 is connected outside each axle end cover 4.

[0045] As a preferred embodiment, a connecting piece 23 is arranged on the cover plate 22 at each mounting hole, and the connecting piece 23 is connected to the positive and negative poles of the variable resistance unit 3, that is, each variable resistance unit 3 in the thermistor unit 2 can form a current path, thereby achieving the effect of redundant protection.

[0046] In this embodiment, a plurality of series connection plates 41 are circumferentially distributed on each of the shaft end covers 4, and two first contacts 42 are fixed on each of the series connection plates 41.

[0047] The number of series connection plates 41 is half the number of mounting holes; when each series connection plate 41 on the shaft end cover 4 is connected to the connecting piece 23 through the first contact 42, the plurality of variable resistance units 3 achieve a series connection effect, thereby increasing the total resistance of the entire circuit.

[0048] A parallel ring 43 is fixed in the middle of the shaft end cover 4, and a plurality of second contacts 44 are distributed on the parallel ring 43; when the second contacts 44 of the parallel ring 43 are connected to the connecting piece 23, the plurality of variable resistance units 3 achieve a parallel connection effect, which can effectively distribute the current, so that each variable resistance unit shares a part of the total current, thereby improving the load capacity of the system; since each variable resistance unit 3 can be independently adjusted, the system can dynamically adjust the resistance value of each unit according to the actual working condition in the parallel state, so as to optimize the welding parameters.

[0049] In this embodiment, the two first contacts 42 of each series connection plate 41 can be connected to the positive or negative pole of each adjacent variable resistance unit 3.

[0050] In this embodiment, each second contact 44 on the parallel ring 43 is arranged one-to-one with the connecting piece 23, and when each first contact 42 is connected to the connecting piece 23, the second contact 44 is staggered with the connecting piece 23, so that the series connection or parallel connection of each variable resistance unit 3 can be switched during the rotation adjustment of the shaft end cover 4, so as to adapt to different welding requirements, especially for tasks that require frequent switching of welding parameters, such as welding of different materials, thicknesses, or process requirements. By flexibly switching the series and parallel configurations, on the one hand, the current and voltage control can be optimized to ensure the best effect in each welding stage, and on the other hand, multiple monitoring modes can be provided, among which the series configuration is suitable for occasions requiring high precision, and the parallel configuration can distribute the load when the current is large, which not only effectively deals with instantaneous large current and overheating problems, but also maintains stable performance under complex working conditions, reduces the possibility of false triggering, and improves the response speed and reliability of the system.

[0051] As a preferred embodiment, the variable resistance unit 3 comprises:

[0052] Two outer shaft plates 31 are symmetrically arranged and electrically connected with the connecting piece 23;

[0053] A central shaft 32 is rotatably connected between the two outer shaft plates 31, and two positioning rings 33 are coaxially fixed at the two ends of the central shaft 32, and a plurality of connecting holes are formed in the positioning rings 33;

[0054] A connecting guide column 34 is fixed in the connecting hole of each positioning ring 33, and an installation slot is formed in the connecting guide column 34;

[0055] A conductive piece 35 is symmetrically fixed in the installation slot, and a thermistor 36 is detachably installed in each installation slot, and the thermistor 36 is electrically connected with the conductive piece 35;

[0056] An inner contact 37 is eccentrically fixed on one side end face of each outer shaft plate 31 close to the connecting guide column 34.

[0057] In the embodiment, a driving part (not shown in the figure) is arranged outside the outer shaft plate 31, and the driving part is connected and driven with the central shaft 32 through gear meshing, so that the switching docking of the thermistor 36 can be realized by the rotational movement of the central shaft 32 in each variable resistance unit 3.

[0058] In the embodiment, the resistance values of the thermistors 36 in the connecting guide column 34 are different, so that in the combination of the plurality of variable resistance units 3 in series or parallel, the total resistance can be further adjusted in the series state to adapt to different welding requirements, and the current distribution and voltage consistency in the parallel state can be greatly optimized; therefore, in the welding operation which needs to frequently switch the welding parameters, by flexibly selecting the thermistors 36 with different resistance values and combining the series or parallel switching, the current and voltage control can be optimized to ensure the best effect of each welding stage, without stopping or resetting the equipment, and the work efficiency is improved.

[0059] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A welding power supply device with short circuit protection function, comprising a welding box (1), a power supply unit (11), a voltage and current display (12), a transformer, a fuse (13), an overcurrent relay (15) and a thermistor unit (2), characterized in that: The power supply unit (11) is installed on the inner upper side of the welding box (1), the welding box (1) is provided with a control panel, and the voltage and current display (12) is connected with the control panel; The transformer is connected below the power supply unit (11), and a main circuit is connected outside the transformer, a fuse (13) is arranged in the main circuit, a connection port (14) is arranged outside the welding box (1), the main circuit is connected with the connection port through internal wiring, and an overcurrent relay (15) is arranged in series on the main circuit; The thermistor unit (2) is installed in parallel with the overcurrent relay (15) on the same section of the main circuit; The thermistor unit (2) comprises: A mounting cylinder base (21) is provided with a plurality of mounting holes in the inner circumference; A variable resistance unit (3) is fixed in each mounting hole; Cover plates (22) are coaxially arranged at both ends of the mounting cylinder base (21); Shaft end covers (4) are arranged one by one corresponding to each cover plate (22), and each shaft end cover (4) is rotatably connected outside the cover plate (22); a connecting rod (24) is rotatably connected to the middle part of the mounting cylinder base (21), and the two ends of the connecting rod (24) are fixed with each shaft end cover (4); A connecting lead (25) is connected outside each shaft end cover (4); A connecting piece (23) is arranged on each mounting hole of the cover plate (22), and the connecting piece (23) is connected with the positive and negative electrodes of the variable resistance unit (3); The variable resistance unit (3) comprises: Two outer shaft plates (31) are symmetrically arranged, and each outer shaft plate (31) is electrically connected with the connecting piece (23); A center shaft (32) is rotatably connected between the two outer shaft plates (31), and two positioning rings (33) are coaxially fixed at the two ends of the center shaft (32), and a plurality of connecting holes are formed in the positioning rings (33); A connecting guide column (34) is fixed in each connecting hole of the positioning ring (33), and an installation groove is formed in the connecting guide column (34); A conductive sheet (35) is symmetrically fixed in the installation groove, and a thermistor (36) is detachably installed in each installation groove, and the thermistor (36) is electrically connected with the conductive sheet (35); An inner contact (37) is eccentrically fixed on one side end face of each outer shaft plate (31) close to the connecting guide column (34); A plurality of series connection plates (41) are distributed on the shaft end cover (4), each series connection plate (4) on the shaft end cover (4) is connected with the connecting piece (23) through a first contact (42), and a parallel connection ring (43) is fixed in the middle part of the shaft end cover (4), and the parallel connection ring (43) is connected with the connecting piece (23) through a second contact (44); The resistance values of the thermistors (36) in the connecting guide column (34) are different.

2. The welding power supply device with short-circuit protection function according to claim 1, characterized in that: A plurality of series connection plates (41) are circumferentially distributed on each shaft end cover (4), and two first contacts (42) are fixed on each series connection plate (41), and the number of series connection plates (41) is half of the number of mounting holes.

3. The welding power supply device with short-circuit protection function according to claim 1 or 2, characterized in that: A plurality of second contacts (44) are distributed on the parallel connection ring (43).

4. The welding power supply device with short-circuit protection function according to claim 2, characterized in that: Two first contacts (42) of each of the series connection plates (41) can be connected with the positive or negative poles of two adjacent rheostatic units (3) respectively.

5. The welding power supply device with short-circuit protection function according to claim 3, characterized in that: Each second contact (44) on the parallel connection ring (43) is arranged in one-to-one correspondence with a connecting piece (23), and when each first contact (42) is in contact with the connecting piece (23), the second contact (44) is staggered with the connecting piece (23).

6. The welding power supply device with short-circuit protection function according to claim 1 or 2 or 4 or 5, characterized in that: The outer shaft plate (31) is provided with a driving part, and the driving part is connected and driven with the central shaft (32) through gear meshing.

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